| 1 | /* $NetBSD: ip_nat.c,v 1.17 2016/10/04 14:36:46 sborrill Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 2012 by Darren Reed. |
| 5 | * |
| 6 | * See the IPFILTER.LICENCE file for details on licencing. |
| 7 | */ |
| 8 | #if defined(KERNEL) || defined(_KERNEL) |
| 9 | # undef KERNEL |
| 10 | # undef KERNEL |
| 11 | # define KERNEL 1 |
| 12 | # define KERNEL 1 |
| 13 | #endif |
| 14 | #include <sys/errno.h> |
| 15 | #include <sys/types.h> |
| 16 | #include <sys/param.h> |
| 17 | #include <sys/time.h> |
| 18 | #include <sys/file.h> |
| 19 | #if defined(_KERNEL) && \ |
| 20 | (defined(__NetBSD_Version) && (__NetBSD_Version >= 399002000)) |
| 21 | # include <sys/kauth.h> |
| 22 | #endif |
| 23 | #if !defined(_KERNEL) |
| 24 | # include <stdio.h> |
| 25 | # include <string.h> |
| 26 | # include <stdlib.h> |
| 27 | # define KERNEL |
| 28 | # ifdef _OpenBSD__ |
| 29 | struct file; |
| 30 | # endif |
| 31 | # include <sys/uio.h> |
| 32 | # undef KERNEL |
| 33 | #endif |
| 34 | #if defined(_KERNEL) && \ |
| 35 | defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) |
| 36 | # include <sys/filio.h> |
| 37 | # include <sys/fcntl.h> |
| 38 | #else |
| 39 | # include <sys/ioctl.h> |
| 40 | #endif |
| 41 | #if !defined(AIX) |
| 42 | # include <sys/fcntl.h> |
| 43 | #endif |
| 44 | #if !defined(linux) |
| 45 | # include <sys/protosw.h> |
| 46 | #endif |
| 47 | #include <sys/socket.h> |
| 48 | #if defined(_KERNEL) |
| 49 | # include <sys/systm.h> |
| 50 | # if !defined(__SVR4) && !defined(__svr4__) |
| 51 | # include <sys/mbuf.h> |
| 52 | # endif |
| 53 | #endif |
| 54 | #if defined(__SVR4) || defined(__svr4__) |
| 55 | # include <sys/filio.h> |
| 56 | # include <sys/byteorder.h> |
| 57 | # ifdef KERNEL |
| 58 | # include <sys/dditypes.h> |
| 59 | # endif |
| 60 | # include <sys/stream.h> |
| 61 | # include <sys/kmem.h> |
| 62 | #endif |
| 63 | #if _FreeBSD_version >= 300000 |
| 64 | # include <sys/queue.h> |
| 65 | #endif |
| 66 | #include <net/if.h> |
| 67 | #if _FreeBSD_version >= 300000 |
| 68 | # include <net/if_var.h> |
| 69 | #endif |
| 70 | #ifdef sun |
| 71 | # include <net/af.h> |
| 72 | #endif |
| 73 | #include <netinet/in.h> |
| 74 | #include <netinet/in_systm.h> |
| 75 | #include <netinet/ip.h> |
| 76 | |
| 77 | #ifdef RFC1825 |
| 78 | # include <vpn/md5.h> |
| 79 | # include <vpn/ipsec.h> |
| 80 | extern struct ifnet vpnif; |
| 81 | #endif |
| 82 | |
| 83 | #if !defined(linux) |
| 84 | # include <netinet/ip_var.h> |
| 85 | #endif |
| 86 | #include <netinet/tcp.h> |
| 87 | #include <netinet/udp.h> |
| 88 | #include <netinet/ip_icmp.h> |
| 89 | #include "netinet/ip_compat.h" |
| 90 | #include <netinet/tcpip.h> |
| 91 | #include "netinet/ipl.h" |
| 92 | #include "netinet/ip_fil.h" |
| 93 | #include "netinet/ip_nat.h" |
| 94 | #include "netinet/ip_frag.h" |
| 95 | #include "netinet/ip_state.h" |
| 96 | #include "netinet/ip_proxy.h" |
| 97 | #include "netinet/ip_lookup.h" |
| 98 | #include "netinet/ip_dstlist.h" |
| 99 | #include "netinet/ip_sync.h" |
| 100 | #if FREEBSD_GE_REV(300000) |
| 101 | # include <sys/malloc.h> |
| 102 | #endif |
| 103 | #ifdef HAS_SYS_MD5_H |
| 104 | # include <sys/md5.h> |
| 105 | #else |
| 106 | # include "md5.h" |
| 107 | #endif |
| 108 | /* END OF INCLUDES */ |
| 109 | |
| 110 | #undef SOCKADDR_IN |
| 111 | #define SOCKADDR_IN struct sockaddr_in |
| 112 | |
| 113 | #if !defined(lint) |
| 114 | #if defined(__NetBSD__) |
| 115 | #include <sys/cdefs.h> |
| 116 | __KERNEL_RCSID(0, "$NetBSD: ip_nat.c,v 1.17 2016/10/04 14:36:46 sborrill Exp $" ); |
| 117 | #else |
| 118 | static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed" ; |
| 119 | static const char rcsid[] = "@(#)Id: ip_nat.c,v 1.1.1.2 2012/07/22 13:45:27 darrenr Exp" ; |
| 120 | #endif |
| 121 | #endif |
| 122 | |
| 123 | |
| 124 | #define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \ |
| 125 | (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3]) |
| 126 | #define NBUMP(x) softn->(x)++ |
| 127 | #define NBUMPD(x, y) do { \ |
| 128 | softn->x.y++; \ |
| 129 | DT(y); \ |
| 130 | } while (0) |
| 131 | #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++ |
| 132 | #define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \ |
| 133 | DT(x); } while (0) |
| 134 | #define NBUMPSIDEX(y,x,z) \ |
| 135 | do { softn->ipf_nat_stats.ns_side[y].x++; \ |
| 136 | DT(z); } while (0) |
| 137 | #define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \ |
| 138 | DT1(x, fr_info_t *, fin); } while (0) |
| 139 | |
| 140 | frentry_t ipfnatblock; |
| 141 | |
| 142 | static ipftuneable_t ipf_nat_tuneables[] = { |
| 143 | /* nat */ |
| 144 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) }, |
| 145 | "nat_lock" , 0, 1, |
| 146 | stsizeof(ipf_nat_softc_t, ipf_nat_lock), |
| 147 | IPFT_RDONLY, NULL, NULL }, |
| 148 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) }, |
| 149 | "nat_table_size" , 1, 0x7fffffff, |
| 150 | stsizeof(ipf_nat_softc_t, ipf_nat_table_sz), |
| 151 | 0, NULL, ipf_nat_rehash }, |
| 152 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) }, |
| 153 | "nat_table_max" , 1, 0x7fffffff, |
| 154 | stsizeof(ipf_nat_softc_t, ipf_nat_table_max), |
| 155 | 0, NULL, NULL }, |
| 156 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) }, |
| 157 | "nat_rules_size" , 1, 0x7fffffff, |
| 158 | stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz), |
| 159 | 0, NULL, ipf_nat_rehash_rules }, |
| 160 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) }, |
| 161 | "rdr_rules_size" , 1, 0x7fffffff, |
| 162 | stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz), |
| 163 | 0, NULL, ipf_nat_rehash_rules }, |
| 164 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) }, |
| 165 | "hostmap_size" , 1, 0x7fffffff, |
| 166 | stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz), |
| 167 | 0, NULL, ipf_nat_hostmap_rehash }, |
| 168 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) }, |
| 169 | "nat_maxbucket" ,1, 0x7fffffff, |
| 170 | stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket), |
| 171 | 0, NULL, NULL }, |
| 172 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) }, |
| 173 | "nat_logging" , 0, 1, |
| 174 | stsizeof(ipf_nat_softc_t, ipf_nat_logging), |
| 175 | 0, NULL, NULL }, |
| 176 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) }, |
| 177 | "nat_doflush" , 0, 1, |
| 178 | stsizeof(ipf_nat_softc_t, ipf_nat_doflush), |
| 179 | 0, NULL, NULL }, |
| 180 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) }, |
| 181 | "nat_table_wm_low" , 1, 99, |
| 182 | stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low), |
| 183 | 0, NULL, NULL }, |
| 184 | { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) }, |
| 185 | "nat_table_wm_high" , 2, 100, |
| 186 | stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high), |
| 187 | 0, NULL, NULL }, |
| 188 | { { 0 }, |
| 189 | NULL, 0, 0, |
| 190 | 0, |
| 191 | 0, NULL, NULL } |
| 192 | }; |
| 193 | |
| 194 | /* ======================================================================== */ |
| 195 | /* How the NAT is organised and works. */ |
| 196 | /* */ |
| 197 | /* Inside (interface y) NAT Outside (interface x) */ |
| 198 | /* -------------------- -+- ------------------------------------- */ |
| 199 | /* Packet going | out, processsed by ipf_nat_checkout() for x */ |
| 200 | /* ------------> | ------------> */ |
| 201 | /* src=10.1.1.1 | src=192.1.1.1 */ |
| 202 | /* | */ |
| 203 | /* | in, processed by ipf_nat_checkin() for x */ |
| 204 | /* <------------ | <------------ */ |
| 205 | /* dst=10.1.1.1 | dst=192.1.1.1 */ |
| 206 | /* -------------------- -+- ------------------------------------- */ |
| 207 | /* ipf_nat_checkout() - changes ip_src and if required, sport */ |
| 208 | /* - creates a new mapping, if required. */ |
| 209 | /* ipf_nat_checkin() - changes ip_dst and if required, dport */ |
| 210 | /* */ |
| 211 | /* In the NAT table, internal source is recorded as "in" and externally */ |
| 212 | /* seen as "out". */ |
| 213 | /* ======================================================================== */ |
| 214 | |
| 215 | |
| 216 | #if SOLARIS && !defined(INSTANCES) |
| 217 | extern int pfil_delayed_copy; |
| 218 | #endif |
| 219 | |
| 220 | static int ipf_nat_flush_entry(ipf_main_softc_t *, void *); |
| 221 | static int ipf_nat_getent(ipf_main_softc_t *, void *, int); |
| 222 | static int ipf_nat_getsz(ipf_main_softc_t *, void *, int); |
| 223 | static int ipf_nat_putent(ipf_main_softc_t *, void *, int); |
| 224 | static void ipf_nat_addmap(ipf_nat_softc_t *, ipnat_t *); |
| 225 | static void ipf_nat_addrdr(ipf_nat_softc_t *, ipnat_t *); |
| 226 | static int ipf_nat_builddivertmp(ipf_nat_softc_t *, ipnat_t *); |
| 227 | static int ipf_nat_clearlist(ipf_main_softc_t *, ipf_nat_softc_t *); |
| 228 | static int ipf_nat_cmp_rules(ipnat_t *, ipnat_t *); |
| 229 | static int ipf_nat_decap(fr_info_t *, nat_t *); |
| 230 | static void ipf_nat_delrule(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 231 | ipnat_t *, int); |
| 232 | static int ipf_nat_extraflush(ipf_main_softc_t *, ipf_nat_softc_t *, int); |
| 233 | static int ipf_nat_finalise(fr_info_t *, nat_t *); |
| 234 | static int ipf_nat_flushtable(ipf_main_softc_t *, ipf_nat_softc_t *); |
| 235 | static int ipf_nat_getnext(ipf_main_softc_t *, ipftoken_t *, |
| 236 | ipfgeniter_t *, ipfobj_t *); |
| 237 | static int ipf_nat_gettable(ipf_main_softc_t *, ipf_nat_softc_t *, char *); |
| 238 | static hostmap_t *ipf_nat_hostmap(ipf_nat_softc_t *, ipnat_t *, |
| 239 | struct in_addr, struct in_addr, |
| 240 | struct in_addr, u_32_t); |
| 241 | static int ipf_nat_icmpquerytype(int); |
| 242 | static int ipf_nat_iterator(ipf_main_softc_t *, ipftoken_t *, |
| 243 | ipfgeniter_t *, ipfobj_t *); |
| 244 | static int ipf_nat_match(fr_info_t *, ipnat_t *); |
| 245 | static int ipf_nat_matcharray(nat_t *, int *, u_long); |
| 246 | static int ipf_nat_matchflush(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 247 | void *); |
| 248 | static void ipf_nat_mssclamp(tcphdr_t *, u_32_t, fr_info_t *, u_short *); |
| 249 | static int ipf_nat_newmap(fr_info_t *, nat_t *, natinfo_t *); |
| 250 | static int ipf_nat_newdivert(fr_info_t *, nat_t *, natinfo_t *); |
| 251 | static int ipf_nat_newrdr(fr_info_t *, nat_t *, natinfo_t *); |
| 252 | static int ipf_nat_newrewrite(fr_info_t *, nat_t *, natinfo_t *); |
| 253 | static int ipf_nat_nextaddr(fr_info_t *, nat_addr_t *, u_32_t *, u_32_t *); |
| 254 | static int ipf_nat_nextaddrinit(ipf_main_softc_t *, char *, |
| 255 | nat_addr_t *, int, void *); |
| 256 | static int ipf_nat_resolverule(ipf_main_softc_t *, ipnat_t *); |
| 257 | static int ipf_nat_ruleaddrinit(ipf_main_softc_t *, |
| 258 | ipf_nat_softc_t *, ipnat_t *); |
| 259 | static void ipf_nat_rule_fini(ipf_main_softc_t *, ipnat_t *); |
| 260 | static int ipf_nat_rule_init(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 261 | ipnat_t *); |
| 262 | static int ipf_nat_siocaddnat(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 263 | ipnat_t *, int); |
| 264 | static void ipf_nat_siocdelnat(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 265 | ipnat_t *, int); |
| 266 | static void ipf_nat_tabmove(ipf_nat_softc_t *, nat_t *); |
| 267 | |
| 268 | /* ------------------------------------------------------------------------ */ |
| 269 | /* Function: ipf_nat_main_load */ |
| 270 | /* Returns: int - 0 == success, -1 == failure */ |
| 271 | /* Parameters: Nil */ |
| 272 | /* */ |
| 273 | /* The only global NAT structure that needs to be initialised is the filter */ |
| 274 | /* rule that is used with blocking packets. */ |
| 275 | /* ------------------------------------------------------------------------ */ |
| 276 | int |
| 277 | ipf_nat_main_load(void) |
| 278 | { |
| 279 | bzero((char *)&ipfnatblock, sizeof(ipfnatblock)); |
| 280 | ipfnatblock.fr_flags = FR_BLOCK|FR_QUICK; |
| 281 | ipfnatblock.fr_ref = 1; |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | |
| 287 | /* ------------------------------------------------------------------------ */ |
| 288 | /* Function: ipf_nat_main_unload */ |
| 289 | /* Returns: int - 0 == success, -1 == failure */ |
| 290 | /* Parameters: Nil */ |
| 291 | /* */ |
| 292 | /* A null-op function that exists as a placeholder so that the flow in */ |
| 293 | /* other functions is obvious. */ |
| 294 | /* ------------------------------------------------------------------------ */ |
| 295 | int |
| 296 | ipf_nat_main_unload(void) |
| 297 | { |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | |
| 302 | /* ------------------------------------------------------------------------ */ |
| 303 | /* Function: ipf_nat_soft_create */ |
| 304 | /* Returns: void * - NULL = failure, else pointer to NAT context */ |
| 305 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 306 | /* */ |
| 307 | /* Allocate the initial soft context structure for NAT and populate it with */ |
| 308 | /* some default values. Creating the tables is left until we call _init so */ |
| 309 | /* that sizes can be changed before we get under way. */ |
| 310 | /* ------------------------------------------------------------------------ */ |
| 311 | void * |
| 312 | ipf_nat_soft_create(ipf_main_softc_t *softc) |
| 313 | { |
| 314 | ipf_nat_softc_t *softn; |
| 315 | |
| 316 | KMALLOC(softn, ipf_nat_softc_t *); |
| 317 | if (softn == NULL) |
| 318 | return NULL; |
| 319 | |
| 320 | bzero((char *)softn, sizeof(*softn)); |
| 321 | |
| 322 | softn->ipf_nat_tune = ipf_tune_array_copy(softn, |
| 323 | sizeof(ipf_nat_tuneables), |
| 324 | ipf_nat_tuneables); |
| 325 | if (softn->ipf_nat_tune == NULL) { |
| 326 | ipf_nat_soft_destroy(softc, softn); |
| 327 | return NULL; |
| 328 | } |
| 329 | if (ipf_tune_array_link(softc, softn->ipf_nat_tune) == -1) { |
| 330 | ipf_nat_soft_destroy(softc, softn); |
| 331 | return NULL; |
| 332 | } |
| 333 | |
| 334 | softn->ipf_nat_list_tail = &softn->ipf_nat_list; |
| 335 | |
| 336 | softn->ipf_nat_table_max = NAT_TABLE_MAX; |
| 337 | softn->ipf_nat_table_sz = NAT_TABLE_SZ; |
| 338 | softn->ipf_nat_maprules_sz = NAT_SIZE; |
| 339 | softn->ipf_nat_rdrrules_sz = RDR_SIZE; |
| 340 | softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE; |
| 341 | softn->ipf_nat_doflush = 0; |
| 342 | #ifdef IPFILTER_LOG |
| 343 | softn->ipf_nat_logging = 1; |
| 344 | #else |
| 345 | softn->ipf_nat_logging = 0; |
| 346 | #endif |
| 347 | |
| 348 | softn->ipf_nat_defage = DEF_NAT_AGE; |
| 349 | softn->ipf_nat_defipage = IPF_TTLVAL(60); |
| 350 | softn->ipf_nat_deficmpage = IPF_TTLVAL(3); |
| 351 | softn->ipf_nat_table_wm_high = 99; |
| 352 | softn->ipf_nat_table_wm_low = 90; |
| 353 | |
| 354 | return softn; |
| 355 | } |
| 356 | |
| 357 | /* ------------------------------------------------------------------------ */ |
| 358 | /* Function: ipf_nat_soft_destroy */ |
| 359 | /* Returns: Nil */ |
| 360 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 361 | /* */ |
| 362 | /* ------------------------------------------------------------------------ */ |
| 363 | void |
| 364 | ipf_nat_soft_destroy(ipf_main_softc_t *softc, void *arg) |
| 365 | { |
| 366 | ipf_nat_softc_t *softn = arg; |
| 367 | |
| 368 | if (softn->ipf_nat_tune != NULL) { |
| 369 | ipf_tune_array_unlink(softc, softn->ipf_nat_tune); |
| 370 | KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables)); |
| 371 | softn->ipf_nat_tune = NULL; |
| 372 | } |
| 373 | |
| 374 | KFREE(softn); |
| 375 | } |
| 376 | |
| 377 | |
| 378 | /* ------------------------------------------------------------------------ */ |
| 379 | /* Function: ipf_nat_init */ |
| 380 | /* Returns: int - 0 == success, -1 == failure */ |
| 381 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 382 | /* */ |
| 383 | /* Initialise all of the NAT locks, tables and other structures. */ |
| 384 | /* ------------------------------------------------------------------------ */ |
| 385 | int |
| 386 | ipf_nat_soft_init(ipf_main_softc_t *softc, void *arg) |
| 387 | { |
| 388 | ipf_nat_softc_t *softn = arg; |
| 389 | ipftq_t *tq; |
| 390 | int i; |
| 391 | |
| 392 | KMALLOCS(softn->ipf_nat_table[0], nat_t **, \ |
| 393 | sizeof(nat_t *) * softn->ipf_nat_table_sz); |
| 394 | |
| 395 | if (softn->ipf_nat_table[0] != NULL) { |
| 396 | bzero((char *)softn->ipf_nat_table[0], |
| 397 | softn->ipf_nat_table_sz * sizeof(nat_t *)); |
| 398 | } else { |
| 399 | return -1; |
| 400 | } |
| 401 | |
| 402 | KMALLOCS(softn->ipf_nat_table[1], nat_t **, \ |
| 403 | sizeof(nat_t *) * softn->ipf_nat_table_sz); |
| 404 | |
| 405 | if (softn->ipf_nat_table[1] != NULL) { |
| 406 | bzero((char *)softn->ipf_nat_table[1], |
| 407 | softn->ipf_nat_table_sz * sizeof(nat_t *)); |
| 408 | } else { |
| 409 | return -2; |
| 410 | } |
| 411 | |
| 412 | KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \ |
| 413 | sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); |
| 414 | |
| 415 | if (softn->ipf_nat_map_rules != NULL) { |
| 416 | bzero((char *)softn->ipf_nat_map_rules, |
| 417 | softn->ipf_nat_maprules_sz * sizeof(ipnat_t *)); |
| 418 | } else { |
| 419 | return -3; |
| 420 | } |
| 421 | |
| 422 | KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \ |
| 423 | sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); |
| 424 | |
| 425 | if (softn->ipf_nat_rdr_rules != NULL) { |
| 426 | bzero((char *)softn->ipf_nat_rdr_rules, |
| 427 | softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *)); |
| 428 | } else { |
| 429 | return -4; |
| 430 | } |
| 431 | |
| 432 | KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \ |
| 433 | sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); |
| 434 | |
| 435 | if (softn->ipf_hm_maptable != NULL) { |
| 436 | bzero((char *)softn->ipf_hm_maptable, |
| 437 | sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); |
| 438 | } else { |
| 439 | return -5; |
| 440 | } |
| 441 | softn->ipf_hm_maplist = NULL; |
| 442 | |
| 443 | KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *, |
| 444 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 445 | |
| 446 | if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) { |
| 447 | return -6; |
| 448 | } |
| 449 | bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen, |
| 450 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 451 | |
| 452 | KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *, |
| 453 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 454 | |
| 455 | if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) { |
| 456 | return -7; |
| 457 | } |
| 458 | |
| 459 | bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen, |
| 460 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 461 | |
| 462 | if (softn->ipf_nat_maxbucket == 0) { |
| 463 | for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1) |
| 464 | softn->ipf_nat_maxbucket++; |
| 465 | softn->ipf_nat_maxbucket *= 2; |
| 466 | } |
| 467 | |
| 468 | ipf_sttab_init(softc, softn->ipf_nat_tcptq); |
| 469 | /* |
| 470 | * Increase this because we may have "keep state" following this too |
| 471 | * and packet storms can occur if this is removed too quickly. |
| 472 | */ |
| 473 | softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; |
| 474 | softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next = |
| 475 | &softn->ipf_nat_udptq; |
| 476 | |
| 477 | IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage, |
| 478 | "nat ipftq udp tab" ); |
| 479 | softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq; |
| 480 | |
| 481 | IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage, |
| 482 | "nat ipftq udpack tab" ); |
| 483 | softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq; |
| 484 | |
| 485 | IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage, |
| 486 | "nat icmp ipftq tab" ); |
| 487 | softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq; |
| 488 | |
| 489 | IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage, |
| 490 | "nat icmpack ipftq tab" ); |
| 491 | softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq; |
| 492 | |
| 493 | IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage, |
| 494 | "nat ip ipftq tab" ); |
| 495 | softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending; |
| 496 | |
| 497 | IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab" ); |
| 498 | softn->ipf_nat_pending.ifq_next = NULL; |
| 499 | |
| 500 | for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) { |
| 501 | if (tq->ifq_ttl < softn->ipf_nat_deficmpage) |
| 502 | tq->ifq_ttl = softn->ipf_nat_deficmpage; |
| 503 | #ifdef LARGE_NAT |
| 504 | else if (tq->ifq_ttl > softn->ipf_nat_defage) |
| 505 | tq->ifq_ttl = softn->ipf_nat_defage; |
| 506 | #endif |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Increase this because we may have "keep state" following |
| 511 | * this too and packet storms can occur if this is removed |
| 512 | * too quickly. |
| 513 | */ |
| 514 | softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; |
| 515 | |
| 516 | MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex" ); |
| 517 | MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex" ); |
| 518 | |
| 519 | softn->ipf_nat_inited = 1; |
| 520 | |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | |
| 525 | /* ------------------------------------------------------------------------ */ |
| 526 | /* Function: ipf_nat_soft_fini */ |
| 527 | /* Returns: Nil */ |
| 528 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 529 | /* */ |
| 530 | /* Free all memory used by NAT structures allocated at runtime. */ |
| 531 | /* ------------------------------------------------------------------------ */ |
| 532 | int |
| 533 | ipf_nat_soft_fini(ipf_main_softc_t *softc, void *arg) |
| 534 | { |
| 535 | ipf_nat_softc_t *softn = arg; |
| 536 | ipftq_t *ifq, *ifqnext; |
| 537 | |
| 538 | (void) ipf_nat_clearlist(softc, softn); |
| 539 | (void) ipf_nat_flushtable(softc, softn); |
| 540 | |
| 541 | /* |
| 542 | * Proxy timeout queues are not cleaned here because although they |
| 543 | * exist on the NAT list, ipf_proxy_unload is called after unload |
| 544 | * and the proxies actually are responsible for them being created. |
| 545 | * Should the proxy timeouts have their own list? There's no real |
| 546 | * justification as this is the only complication. |
| 547 | */ |
| 548 | for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { |
| 549 | ifqnext = ifq->ifq_next; |
| 550 | if (ipf_deletetimeoutqueue(ifq) == 0) |
| 551 | ipf_freetimeoutqueue(softc, ifq); |
| 552 | } |
| 553 | |
| 554 | if (softn->ipf_nat_table[0] != NULL) { |
| 555 | KFREES(softn->ipf_nat_table[0], |
| 556 | sizeof(nat_t *) * softn->ipf_nat_table_sz); |
| 557 | softn->ipf_nat_table[0] = NULL; |
| 558 | } |
| 559 | if (softn->ipf_nat_table[1] != NULL) { |
| 560 | KFREES(softn->ipf_nat_table[1], |
| 561 | sizeof(nat_t *) * softn->ipf_nat_table_sz); |
| 562 | softn->ipf_nat_table[1] = NULL; |
| 563 | } |
| 564 | if (softn->ipf_nat_map_rules != NULL) { |
| 565 | KFREES(softn->ipf_nat_map_rules, |
| 566 | sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); |
| 567 | softn->ipf_nat_map_rules = NULL; |
| 568 | } |
| 569 | if (softn->ipf_nat_rdr_rules != NULL) { |
| 570 | KFREES(softn->ipf_nat_rdr_rules, |
| 571 | sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); |
| 572 | softn->ipf_nat_rdr_rules = NULL; |
| 573 | } |
| 574 | if (softn->ipf_hm_maptable != NULL) { |
| 575 | KFREES(softn->ipf_hm_maptable, |
| 576 | sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); |
| 577 | softn->ipf_hm_maptable = NULL; |
| 578 | } |
| 579 | if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { |
| 580 | KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, |
| 581 | sizeof(u_int) * softn->ipf_nat_table_sz); |
| 582 | softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL; |
| 583 | } |
| 584 | if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { |
| 585 | KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, |
| 586 | sizeof(u_int) * softn->ipf_nat_table_sz); |
| 587 | softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL; |
| 588 | } |
| 589 | |
| 590 | if (softn->ipf_nat_inited == 1) { |
| 591 | softn->ipf_nat_inited = 0; |
| 592 | ipf_sttab_destroy(softn->ipf_nat_tcptq); |
| 593 | |
| 594 | MUTEX_DESTROY(&softn->ipf_nat_new); |
| 595 | MUTEX_DESTROY(&softn->ipf_nat_io); |
| 596 | |
| 597 | MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock); |
| 598 | MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock); |
| 599 | MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock); |
| 600 | MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock); |
| 601 | MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock); |
| 602 | MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock); |
| 603 | } |
| 604 | |
| 605 | return 0; |
| 606 | } |
| 607 | |
| 608 | |
| 609 | /* ------------------------------------------------------------------------ */ |
| 610 | /* Function: ipf_nat_setlock */ |
| 611 | /* Returns: Nil */ |
| 612 | /* Parameters: arg(I) - pointer to soft state information */ |
| 613 | /* tmp(I) - new lock value */ |
| 614 | /* */ |
| 615 | /* Set the "lock status" of NAT to the value in tmp. */ |
| 616 | /* ------------------------------------------------------------------------ */ |
| 617 | void |
| 618 | ipf_nat_setlock(void *arg, int tmp) |
| 619 | { |
| 620 | ipf_nat_softc_t *softn = arg; |
| 621 | |
| 622 | softn->ipf_nat_lock = tmp; |
| 623 | } |
| 624 | |
| 625 | |
| 626 | /* ------------------------------------------------------------------------ */ |
| 627 | /* Function: ipf_nat_addrdr */ |
| 628 | /* Returns: Nil */ |
| 629 | /* Parameters: n(I) - pointer to NAT rule to add */ |
| 630 | /* */ |
| 631 | /* Adds a redirect rule to the hash table of redirect rules and the list of */ |
| 632 | /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */ |
| 633 | /* use by redirect rules. */ |
| 634 | /* ------------------------------------------------------------------------ */ |
| 635 | static void |
| 636 | ipf_nat_addrdr(ipf_nat_softc_t *softn, ipnat_t *n) |
| 637 | { |
| 638 | ipnat_t **np; |
| 639 | u_32_t j; |
| 640 | u_int hv; |
| 641 | u_int rhv; |
| 642 | int k; |
| 643 | |
| 644 | if (n->in_odstatype == FRI_NORMAL) { |
| 645 | k = count4bits(n->in_odstmsk); |
| 646 | ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask); |
| 647 | j = (n->in_odstaddr & n->in_odstmsk); |
| 648 | rhv = NAT_HASH_FN(j, 0, 0xffffffff); |
| 649 | } else { |
| 650 | ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask); |
| 651 | j = 0; |
| 652 | rhv = 0; |
| 653 | } |
| 654 | hv = rhv % softn->ipf_nat_rdrrules_sz; |
| 655 | np = softn->ipf_nat_rdr_rules + hv; |
| 656 | while (*np != NULL) |
| 657 | np = &(*np)->in_rnext; |
| 658 | n->in_rnext = NULL; |
| 659 | n->in_prnext = np; |
| 660 | n->in_hv[0] = hv; |
| 661 | n->in_use++; |
| 662 | *np = n; |
| 663 | } |
| 664 | |
| 665 | |
| 666 | /* ------------------------------------------------------------------------ */ |
| 667 | /* Function: ipf_nat_addmap */ |
| 668 | /* Returns: Nil */ |
| 669 | /* Parameters: n(I) - pointer to NAT rule to add */ |
| 670 | /* */ |
| 671 | /* Adds a NAT map rule to the hash table of rules and the list of loaded */ |
| 672 | /* NAT rules. Updates the bitmask indicating which netmasks are in use by */ |
| 673 | /* redirect rules. */ |
| 674 | /* ------------------------------------------------------------------------ */ |
| 675 | static void |
| 676 | ipf_nat_addmap(ipf_nat_softc_t *softn, ipnat_t *n) |
| 677 | { |
| 678 | ipnat_t **np; |
| 679 | u_32_t j; |
| 680 | u_int hv; |
| 681 | u_int rhv; |
| 682 | int k; |
| 683 | |
| 684 | if (n->in_osrcatype == FRI_NORMAL) { |
| 685 | k = count4bits(n->in_osrcmsk); |
| 686 | ipf_inet_mask_add(k, &softn->ipf_nat_map_mask); |
| 687 | j = (n->in_osrcaddr & n->in_osrcmsk); |
| 688 | rhv = NAT_HASH_FN(j, 0, 0xffffffff); |
| 689 | } else { |
| 690 | ipf_inet_mask_add(0, &softn->ipf_nat_map_mask); |
| 691 | j = 0; |
| 692 | rhv = 0; |
| 693 | } |
| 694 | hv = rhv % softn->ipf_nat_maprules_sz; |
| 695 | np = softn->ipf_nat_map_rules + hv; |
| 696 | while (*np != NULL) |
| 697 | np = &(*np)->in_mnext; |
| 698 | n->in_mnext = NULL; |
| 699 | n->in_pmnext = np; |
| 700 | n->in_hv[1] = rhv; |
| 701 | n->in_use++; |
| 702 | *np = n; |
| 703 | } |
| 704 | |
| 705 | |
| 706 | /* ------------------------------------------------------------------------ */ |
| 707 | /* Function: ipf_nat_delrdr */ |
| 708 | /* Returns: Nil */ |
| 709 | /* Parameters: n(I) - pointer to NAT rule to delete */ |
| 710 | /* */ |
| 711 | /* Removes a redirect rule from the hash table of redirect rules. */ |
| 712 | /* ------------------------------------------------------------------------ */ |
| 713 | void |
| 714 | ipf_nat_delrdr(ipf_nat_softc_t *softn, ipnat_t *n) |
| 715 | { |
| 716 | if (n->in_odstatype == FRI_NORMAL) { |
| 717 | int k = count4bits(n->in_odstmsk); |
| 718 | ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask); |
| 719 | } else { |
| 720 | ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask); |
| 721 | } |
| 722 | if (n->in_rnext) |
| 723 | n->in_rnext->in_prnext = n->in_prnext; |
| 724 | *n->in_prnext = n->in_rnext; |
| 725 | n->in_use--; |
| 726 | } |
| 727 | |
| 728 | |
| 729 | /* ------------------------------------------------------------------------ */ |
| 730 | /* Function: ipf_nat_delmap */ |
| 731 | /* Returns: Nil */ |
| 732 | /* Parameters: n(I) - pointer to NAT rule to delete */ |
| 733 | /* */ |
| 734 | /* Removes a NAT map rule from the hash table of NAT map rules. */ |
| 735 | /* ------------------------------------------------------------------------ */ |
| 736 | void |
| 737 | ipf_nat_delmap(ipf_nat_softc_t *softn, ipnat_t *n) |
| 738 | { |
| 739 | if (n->in_osrcatype == FRI_NORMAL) { |
| 740 | int k = count4bits(n->in_osrcmsk); |
| 741 | ipf_inet_mask_del(k, &softn->ipf_nat_map_mask); |
| 742 | } else { |
| 743 | ipf_inet_mask_del(0, &softn->ipf_nat_map_mask); |
| 744 | } |
| 745 | if (n->in_mnext != NULL) |
| 746 | n->in_mnext->in_pmnext = n->in_pmnext; |
| 747 | *n->in_pmnext = n->in_mnext; |
| 748 | n->in_use--; |
| 749 | } |
| 750 | |
| 751 | |
| 752 | /* ------------------------------------------------------------------------ */ |
| 753 | /* Function: ipf_nat_hostmap */ |
| 754 | /* Returns: struct hostmap* - NULL if no hostmap could be created, */ |
| 755 | /* else a pointer to the hostmapping to use */ |
| 756 | /* Parameters: np(I) - pointer to NAT rule */ |
| 757 | /* real(I) - real IP address */ |
| 758 | /* map(I) - mapped IP address */ |
| 759 | /* port(I) - destination port number */ |
| 760 | /* Write Locks: ipf_nat */ |
| 761 | /* */ |
| 762 | /* Check if an ip address has already been allocated for a given mapping */ |
| 763 | /* that is not doing port based translation. If is not yet allocated, then */ |
| 764 | /* create a new entry if a non-NULL NAT rule pointer has been supplied. */ |
| 765 | /* ------------------------------------------------------------------------ */ |
| 766 | static struct hostmap * |
| 767 | ipf_nat_hostmap(ipf_nat_softc_t *softn, ipnat_t *np, struct in_addr src, |
| 768 | struct in_addr dst, struct in_addr map, u_32_t port) |
| 769 | { |
| 770 | hostmap_t *hm; |
| 771 | u_int hv, rhv; |
| 772 | |
| 773 | hv = (src.s_addr ^ dst.s_addr); |
| 774 | hv += src.s_addr; |
| 775 | hv += dst.s_addr; |
| 776 | rhv = hv; |
| 777 | hv %= softn->ipf_nat_hostmap_sz; |
| 778 | for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext) |
| 779 | if ((hm->hm_osrcip.s_addr == src.s_addr) && |
| 780 | (hm->hm_odstip.s_addr == dst.s_addr) && |
| 781 | ((np == NULL) || (np == hm->hm_ipnat)) && |
| 782 | ((port == 0) || (port == hm->hm_port))) { |
| 783 | softn->ipf_nat_stats.ns_hm_addref++; |
| 784 | hm->hm_ref++; |
| 785 | return hm; |
| 786 | } |
| 787 | |
| 788 | if (np == NULL) { |
| 789 | softn->ipf_nat_stats.ns_hm_nullnp++; |
| 790 | return NULL; |
| 791 | } |
| 792 | |
| 793 | KMALLOC(hm, hostmap_t *); |
| 794 | if (hm) { |
| 795 | hm->hm_next = softn->ipf_hm_maplist; |
| 796 | hm->hm_pnext = &softn->ipf_hm_maplist; |
| 797 | if (softn->ipf_hm_maplist != NULL) |
| 798 | softn->ipf_hm_maplist->hm_pnext = &hm->hm_next; |
| 799 | softn->ipf_hm_maplist = hm; |
| 800 | hm->hm_hnext = softn->ipf_hm_maptable[hv]; |
| 801 | hm->hm_phnext = softn->ipf_hm_maptable + hv; |
| 802 | if (softn->ipf_hm_maptable[hv] != NULL) |
| 803 | softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; |
| 804 | softn->ipf_hm_maptable[hv] = hm; |
| 805 | hm->hm_ipnat = np; |
| 806 | np->in_use++; |
| 807 | hm->hm_osrcip = src; |
| 808 | hm->hm_odstip = dst; |
| 809 | hm->hm_nsrcip = map; |
| 810 | hm->hm_ndstip.s_addr = 0; |
| 811 | hm->hm_ref = 1; |
| 812 | hm->hm_port = port; |
| 813 | hm->hm_hv = rhv; |
| 814 | hm->hm_v = 4; |
| 815 | softn->ipf_nat_stats.ns_hm_new++; |
| 816 | } else { |
| 817 | softn->ipf_nat_stats.ns_hm_newfail++; |
| 818 | } |
| 819 | return hm; |
| 820 | } |
| 821 | |
| 822 | |
| 823 | /* ------------------------------------------------------------------------ */ |
| 824 | /* Function: ipf_nat_hostmapdel */ |
| 825 | /* Returns: Nil */ |
| 826 | /* Parameters: hmp(I) - pointer to hostmap structure pointer */ |
| 827 | /* Write Locks: ipf_nat */ |
| 828 | /* */ |
| 829 | /* Decrement the references to this hostmap structure by one. If this */ |
| 830 | /* reaches zero then remove it and free it. */ |
| 831 | /* ------------------------------------------------------------------------ */ |
| 832 | void |
| 833 | ipf_nat_hostmapdel(ipf_main_softc_t *softc, struct hostmap **hmp) |
| 834 | { |
| 835 | struct hostmap *hm; |
| 836 | |
| 837 | hm = *hmp; |
| 838 | *hmp = NULL; |
| 839 | |
| 840 | hm->hm_ref--; |
| 841 | if (hm->hm_ref == 0) { |
| 842 | ipf_nat_rule_deref(softc, &hm->hm_ipnat); |
| 843 | if (hm->hm_hnext) |
| 844 | hm->hm_hnext->hm_phnext = hm->hm_phnext; |
| 845 | *hm->hm_phnext = hm->hm_hnext; |
| 846 | if (hm->hm_next) |
| 847 | hm->hm_next->hm_pnext = hm->hm_pnext; |
| 848 | *hm->hm_pnext = hm->hm_next; |
| 849 | KFREE(hm); |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | |
| 854 | /* ------------------------------------------------------------------------ */ |
| 855 | /* Function: ipf_fix_outcksum */ |
| 856 | /* Returns: Nil */ |
| 857 | /* Parameters: fin(I) - pointer to packet information */ |
| 858 | /* sp(I) - location of 16bit checksum to update */ |
| 859 | /* n((I) - amount to adjust checksum by */ |
| 860 | /* */ |
| 861 | /* Adjusts the 16bit checksum by "n" for packets going out. */ |
| 862 | /* ------------------------------------------------------------------------ */ |
| 863 | void |
| 864 | ipf_fix_outcksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) |
| 865 | { |
| 866 | u_short sumshort; |
| 867 | u_32_t sum1; |
| 868 | |
| 869 | if (n == 0) |
| 870 | return; |
| 871 | |
| 872 | if (cksum == 4) { |
| 873 | *sp = 0; |
| 874 | return; |
| 875 | } |
| 876 | if (cksum == 2) { |
| 877 | sum1 = partial; |
| 878 | sum1 = (sum1 & 0xffff) + (sum1 >> 16); |
| 879 | *sp = htons(sum1); |
| 880 | return; |
| 881 | } |
| 882 | sum1 = (~ntohs(*sp)) & 0xffff; |
| 883 | sum1 += (n); |
| 884 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 885 | /* Again */ |
| 886 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 887 | sumshort = ~(u_short)sum1; |
| 888 | *(sp) = htons(sumshort); |
| 889 | } |
| 890 | |
| 891 | |
| 892 | /* ------------------------------------------------------------------------ */ |
| 893 | /* Function: ipf_fix_incksum */ |
| 894 | /* Returns: Nil */ |
| 895 | /* Parameters: fin(I) - pointer to packet information */ |
| 896 | /* sp(I) - location of 16bit checksum to update */ |
| 897 | /* n((I) - amount to adjust checksum by */ |
| 898 | /* */ |
| 899 | /* Adjusts the 16bit checksum by "n" for packets going in. */ |
| 900 | /* ------------------------------------------------------------------------ */ |
| 901 | void |
| 902 | ipf_fix_incksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) |
| 903 | { |
| 904 | u_short sumshort; |
| 905 | u_32_t sum1; |
| 906 | |
| 907 | if (n == 0) |
| 908 | return; |
| 909 | |
| 910 | if (cksum == 4) { |
| 911 | *sp = 0; |
| 912 | return; |
| 913 | } |
| 914 | if (cksum == 2) { |
| 915 | sum1 = partial; |
| 916 | sum1 = (sum1 & 0xffff) + (sum1 >> 16); |
| 917 | *sp = htons(sum1); |
| 918 | return; |
| 919 | } |
| 920 | |
| 921 | sum1 = (~ntohs(*sp)) & 0xffff; |
| 922 | sum1 += ~(n) & 0xffff; |
| 923 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 924 | /* Again */ |
| 925 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 926 | sumshort = ~(u_short)sum1; |
| 927 | *(sp) = htons(sumshort); |
| 928 | } |
| 929 | |
| 930 | |
| 931 | /* ------------------------------------------------------------------------ */ |
| 932 | /* Function: ipf_fix_datacksum */ |
| 933 | /* Returns: Nil */ |
| 934 | /* Parameters: sp(I) - location of 16bit checksum to update */ |
| 935 | /* n((I) - amount to adjust checksum by */ |
| 936 | /* */ |
| 937 | /* Fix_datacksum is used *only* for the adjustments of checksums in the */ |
| 938 | /* data section of an IP packet. */ |
| 939 | /* */ |
| 940 | /* The only situation in which you need to do this is when NAT'ing an */ |
| 941 | /* ICMP error message. Such a message, contains in its body the IP header */ |
| 942 | /* of the original IP packet, that causes the error. */ |
| 943 | /* */ |
| 944 | /* You can't use fix_incksum or fix_outcksum in that case, because for the */ |
| 945 | /* kernel the data section of the ICMP error is just data, and no special */ |
| 946 | /* processing like hardware cksum or ntohs processing have been done by the */ |
| 947 | /* kernel on the data section. */ |
| 948 | /* ------------------------------------------------------------------------ */ |
| 949 | void |
| 950 | ipf_fix_datacksum(u_short *sp, u_32_t n) |
| 951 | { |
| 952 | u_short sumshort; |
| 953 | u_32_t sum1; |
| 954 | |
| 955 | if (n == 0) |
| 956 | return; |
| 957 | |
| 958 | sum1 = (~ntohs(*sp)) & 0xffff; |
| 959 | sum1 += (n); |
| 960 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 961 | /* Again */ |
| 962 | sum1 = (sum1 >> 16) + (sum1 & 0xffff); |
| 963 | sumshort = ~(u_short)sum1; |
| 964 | *(sp) = htons(sumshort); |
| 965 | } |
| 966 | |
| 967 | |
| 968 | /* ------------------------------------------------------------------------ */ |
| 969 | /* Function: ipf_nat_ioctl */ |
| 970 | /* Returns: int - 0 == success, != 0 == failure */ |
| 971 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 972 | /* data(I) - pointer to ioctl data */ |
| 973 | /* cmd(I) - ioctl command integer */ |
| 974 | /* mode(I) - file mode bits used with open */ |
| 975 | /* uid(I) - uid of calling process */ |
| 976 | /* ctx(I) - pointer used as key for finding context */ |
| 977 | /* */ |
| 978 | /* Processes an ioctl call made to operate on the IP Filter NAT device. */ |
| 979 | /* ------------------------------------------------------------------------ */ |
| 980 | int |
| 981 | ipf_nat_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, |
| 982 | int uid, void *ctx) |
| 983 | { |
| 984 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 985 | int error = 0, ret, arg, getlock; |
| 986 | ipnat_t *nat, *nt, *n; |
| 987 | ipnat_t natd; |
| 988 | SPL_INT(s); |
| 989 | |
| 990 | #if BSD_GE_YEAR(199306) && defined(_KERNEL) |
| 991 | # if NETBSD_GE_REV(399002000) |
| 992 | if ((mode & FWRITE) && |
| 993 | kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL, |
| 994 | KAUTH_REQ_NETWORK_FIREWALL_FW, |
| 995 | NULL, NULL, NULL)) |
| 996 | # else |
| 997 | # if defined(__FreeBSD_version) && (__FreeBSD_version >= 500034) |
| 998 | if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE)) |
| 999 | # else |
| 1000 | if ((securelevel >= 3) && (mode & FWRITE)) |
| 1001 | # endif |
| 1002 | # endif |
| 1003 | { |
| 1004 | IPFERROR(60001); |
| 1005 | return EPERM; |
| 1006 | } |
| 1007 | #endif |
| 1008 | |
| 1009 | #if defined(__osf__) && defined(_KERNEL) |
| 1010 | getlock = 0; |
| 1011 | #else |
| 1012 | getlock = (mode & NAT_LOCKHELD) ? 0 : 1; |
| 1013 | #endif |
| 1014 | |
| 1015 | n = NULL; |
| 1016 | nt = NULL; |
| 1017 | nat = NULL; |
| 1018 | |
| 1019 | if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) || |
| 1020 | (cmd == (ioctlcmd_t)SIOCPURGENAT)) { |
| 1021 | if (mode & NAT_SYSSPACE) { |
| 1022 | bcopy(data, (char *)&natd, sizeof(natd)); |
| 1023 | nat = &natd; |
| 1024 | error = 0; |
| 1025 | } else { |
| 1026 | bzero(&natd, sizeof(natd)); |
| 1027 | error = ipf_inobj(softc, data, NULL, &natd, |
| 1028 | IPFOBJ_IPNAT); |
| 1029 | if (error != 0) |
| 1030 | goto done; |
| 1031 | |
| 1032 | if (natd.in_size < sizeof(ipnat_t)) { |
| 1033 | error = EINVAL; |
| 1034 | goto done; |
| 1035 | } |
| 1036 | KMALLOCS(nt, ipnat_t *, natd.in_size); |
| 1037 | if (nt == NULL) { |
| 1038 | IPFERROR(60070); |
| 1039 | error = ENOMEM; |
| 1040 | goto done; |
| 1041 | } |
| 1042 | bzero(nt, natd.in_size); |
| 1043 | error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT, |
| 1044 | natd.in_size); |
| 1045 | if (error) |
| 1046 | goto done; |
| 1047 | nat = nt; |
| 1048 | } |
| 1049 | |
| 1050 | /* |
| 1051 | * For add/delete, look to see if the NAT entry is |
| 1052 | * already present |
| 1053 | */ |
| 1054 | nat->in_flags &= IPN_USERFLAGS; |
| 1055 | if ((nat->in_redir & NAT_MAPBLK) == 0) { |
| 1056 | if (nat->in_osrcatype == FRI_NORMAL || |
| 1057 | nat->in_osrcatype == FRI_NONE) |
| 1058 | nat->in_osrcaddr &= nat->in_osrcmsk; |
| 1059 | if (nat->in_odstatype == FRI_NORMAL || |
| 1060 | nat->in_odstatype == FRI_NONE) |
| 1061 | nat->in_odstaddr &= nat->in_odstmsk; |
| 1062 | if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) { |
| 1063 | if (nat->in_nsrcatype == FRI_NORMAL) |
| 1064 | nat->in_nsrcaddr &= nat->in_nsrcmsk; |
| 1065 | if (nat->in_ndstatype == FRI_NORMAL) |
| 1066 | nat->in_ndstaddr &= nat->in_ndstmsk; |
| 1067 | } |
| 1068 | } |
| 1069 | |
| 1070 | error = ipf_nat_rule_init(softc, softn, nat); |
| 1071 | if (error != 0) |
| 1072 | goto done; |
| 1073 | |
| 1074 | MUTEX_ENTER(&softn->ipf_nat_io); |
| 1075 | for (n = softn->ipf_nat_list; n != NULL; n = n->in_next) |
| 1076 | if (ipf_nat_cmp_rules(nat, n) == 0) |
| 1077 | break; |
| 1078 | } |
| 1079 | |
| 1080 | switch (cmd) |
| 1081 | { |
| 1082 | #ifdef IPFILTER_LOG |
| 1083 | case SIOCIPFFB : |
| 1084 | { |
| 1085 | int tmp; |
| 1086 | |
| 1087 | if (!(mode & FWRITE)) { |
| 1088 | IPFERROR(60002); |
| 1089 | error = EPERM; |
| 1090 | } else { |
| 1091 | tmp = ipf_log_clear(softc, IPL_LOGNAT); |
| 1092 | error = BCOPYOUT(&tmp, data, sizeof(tmp)); |
| 1093 | if (error != 0) { |
| 1094 | IPFERROR(60057); |
| 1095 | error = EFAULT; |
| 1096 | } |
| 1097 | } |
| 1098 | break; |
| 1099 | } |
| 1100 | |
| 1101 | case SIOCSETLG : |
| 1102 | if (!(mode & FWRITE)) { |
| 1103 | IPFERROR(60003); |
| 1104 | error = EPERM; |
| 1105 | } else { |
| 1106 | error = BCOPYIN(data, &softn->ipf_nat_logging, |
| 1107 | sizeof(softn->ipf_nat_logging)); |
| 1108 | if (error != 0) |
| 1109 | error = EFAULT; |
| 1110 | } |
| 1111 | break; |
| 1112 | |
| 1113 | case SIOCGETLG : |
| 1114 | error = BCOPYOUT(&softn->ipf_nat_logging, data, |
| 1115 | sizeof(softn->ipf_nat_logging)); |
| 1116 | if (error != 0) { |
| 1117 | IPFERROR(60004); |
| 1118 | error = EFAULT; |
| 1119 | } |
| 1120 | break; |
| 1121 | |
| 1122 | case FIONREAD : |
| 1123 | arg = ipf_log_bytesused(softc, IPL_LOGNAT); |
| 1124 | error = BCOPYOUT(&arg, data, sizeof(arg)); |
| 1125 | if (error != 0) { |
| 1126 | IPFERROR(60005); |
| 1127 | error = EFAULT; |
| 1128 | } |
| 1129 | break; |
| 1130 | #endif |
| 1131 | case SIOCADNAT : |
| 1132 | if (!(mode & FWRITE)) { |
| 1133 | IPFERROR(60006); |
| 1134 | error = EPERM; |
| 1135 | } else if (n != NULL) { |
| 1136 | natd.in_flineno = n->in_flineno; |
| 1137 | (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT); |
| 1138 | IPFERROR(60007); |
| 1139 | error = EEXIST; |
| 1140 | } else if (nt == NULL) { |
| 1141 | IPFERROR(60008); |
| 1142 | error = ENOMEM; |
| 1143 | } |
| 1144 | if (error != 0) { |
| 1145 | MUTEX_EXIT(&softn->ipf_nat_io); |
| 1146 | break; |
| 1147 | } |
| 1148 | if (nat != nt) |
| 1149 | bcopy((char *)nat, (char *)nt, sizeof(*n)); |
| 1150 | error = ipf_nat_siocaddnat(softc, softn, nt, getlock); |
| 1151 | MUTEX_EXIT(&softn->ipf_nat_io); |
| 1152 | if (error == 0) { |
| 1153 | nat = NULL; |
| 1154 | nt = NULL; |
| 1155 | } |
| 1156 | break; |
| 1157 | |
| 1158 | case SIOCRMNAT : |
| 1159 | case SIOCPURGENAT : |
| 1160 | if (!(mode & FWRITE)) { |
| 1161 | IPFERROR(60009); |
| 1162 | error = EPERM; |
| 1163 | n = NULL; |
| 1164 | } else if (n == NULL) { |
| 1165 | IPFERROR(60010); |
| 1166 | error = ESRCH; |
| 1167 | } |
| 1168 | |
| 1169 | if (error != 0) { |
| 1170 | MUTEX_EXIT(&softn->ipf_nat_io); |
| 1171 | break; |
| 1172 | } |
| 1173 | if (cmd == (ioctlcmd_t)SIOCPURGENAT) { |
| 1174 | error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT, |
| 1175 | n->in_size); |
| 1176 | if (error) { |
| 1177 | MUTEX_EXIT(&softn->ipf_nat_io); |
| 1178 | goto done; |
| 1179 | } |
| 1180 | n->in_flags |= IPN_PURGE; |
| 1181 | } |
| 1182 | ipf_nat_siocdelnat(softc, softn, n, getlock); |
| 1183 | |
| 1184 | MUTEX_EXIT(&softn->ipf_nat_io); |
| 1185 | n = NULL; |
| 1186 | break; |
| 1187 | |
| 1188 | case SIOCGNATS : |
| 1189 | { |
| 1190 | natstat_t *nsp = &softn->ipf_nat_stats; |
| 1191 | |
| 1192 | nsp->ns_side[0].ns_table = softn->ipf_nat_table[0]; |
| 1193 | nsp->ns_side[1].ns_table = softn->ipf_nat_table[1]; |
| 1194 | nsp->ns_list = softn->ipf_nat_list; |
| 1195 | nsp->ns_maptable = softn->ipf_hm_maptable; |
| 1196 | nsp->ns_maplist = softn->ipf_hm_maplist; |
| 1197 | nsp->ns_nattab_sz = softn->ipf_nat_table_sz; |
| 1198 | nsp->ns_nattab_max = softn->ipf_nat_table_max; |
| 1199 | nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz; |
| 1200 | nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz; |
| 1201 | nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz; |
| 1202 | nsp->ns_instances = softn->ipf_nat_instances; |
| 1203 | nsp->ns_ticks = softc->ipf_ticks; |
| 1204 | #ifdef IPFILTER_LOGGING |
| 1205 | nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT); |
| 1206 | nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT); |
| 1207 | #else |
| 1208 | nsp->ns_log_ok = 0; |
| 1209 | nsp->ns_log_fail = 0; |
| 1210 | #endif |
| 1211 | error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT); |
| 1212 | break; |
| 1213 | } |
| 1214 | |
| 1215 | case SIOCGNATL : |
| 1216 | { |
| 1217 | natlookup_t nl; |
| 1218 | |
| 1219 | error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP); |
| 1220 | if (error == 0) { |
| 1221 | void *ptr; |
| 1222 | |
| 1223 | if (getlock) { |
| 1224 | READ_ENTER(&softc->ipf_nat); |
| 1225 | } |
| 1226 | |
| 1227 | switch (nl.nl_v) |
| 1228 | { |
| 1229 | case 4 : |
| 1230 | ptr = ipf_nat_lookupredir(softc, &nl); |
| 1231 | break; |
| 1232 | #ifdef USE_INET6 |
| 1233 | case 6 : |
| 1234 | ptr = ipf_nat6_lookupredir(softc, &nl); |
| 1235 | break; |
| 1236 | #endif |
| 1237 | default: |
| 1238 | ptr = NULL; |
| 1239 | break; |
| 1240 | } |
| 1241 | |
| 1242 | if (getlock) { |
| 1243 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1244 | } |
| 1245 | if (ptr != NULL) { |
| 1246 | error = ipf_outobj(softc, data, &nl, |
| 1247 | IPFOBJ_NATLOOKUP); |
| 1248 | } else { |
| 1249 | IPFERROR(60011); |
| 1250 | error = ESRCH; |
| 1251 | } |
| 1252 | } |
| 1253 | break; |
| 1254 | } |
| 1255 | |
| 1256 | case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */ |
| 1257 | if (!(mode & FWRITE)) { |
| 1258 | IPFERROR(60012); |
| 1259 | error = EPERM; |
| 1260 | break; |
| 1261 | } |
| 1262 | if (getlock) { |
| 1263 | WRITE_ENTER(&softc->ipf_nat); |
| 1264 | } |
| 1265 | |
| 1266 | error = BCOPYIN(data, &arg, sizeof(arg)); |
| 1267 | if (error != 0) { |
| 1268 | IPFERROR(60013); |
| 1269 | error = EFAULT; |
| 1270 | } else { |
| 1271 | if (arg == 0) |
| 1272 | ret = ipf_nat_flushtable(softc, softn); |
| 1273 | else if (arg == 1) |
| 1274 | ret = ipf_nat_clearlist(softc, softn); |
| 1275 | else |
| 1276 | ret = ipf_nat_extraflush(softc, softn, arg); |
| 1277 | ipf_proxy_flush(softc->ipf_proxy_soft, arg); |
| 1278 | } |
| 1279 | |
| 1280 | if (getlock) { |
| 1281 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1282 | } |
| 1283 | if (error == 0) { |
| 1284 | error = BCOPYOUT(&ret, data, sizeof(ret)); |
| 1285 | } |
| 1286 | break; |
| 1287 | |
| 1288 | case SIOCMATCHFLUSH : |
| 1289 | if (!(mode & FWRITE)) { |
| 1290 | IPFERROR(60014); |
| 1291 | error = EPERM; |
| 1292 | break; |
| 1293 | } |
| 1294 | if (getlock) { |
| 1295 | WRITE_ENTER(&softc->ipf_nat); |
| 1296 | } |
| 1297 | |
| 1298 | error = ipf_nat_matchflush(softc, softn, data); |
| 1299 | |
| 1300 | if (getlock) { |
| 1301 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1302 | } |
| 1303 | break; |
| 1304 | |
| 1305 | case SIOCPROXY : |
| 1306 | error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx); |
| 1307 | break; |
| 1308 | |
| 1309 | case SIOCSTLCK : |
| 1310 | if (!(mode & FWRITE)) { |
| 1311 | IPFERROR(60015); |
| 1312 | error = EPERM; |
| 1313 | } else { |
| 1314 | error = ipf_lock(data, &softn->ipf_nat_lock); |
| 1315 | } |
| 1316 | break; |
| 1317 | |
| 1318 | case SIOCSTPUT : |
| 1319 | if ((mode & FWRITE) != 0) { |
| 1320 | error = ipf_nat_putent(softc, data, getlock); |
| 1321 | } else { |
| 1322 | IPFERROR(60016); |
| 1323 | error = EACCES; |
| 1324 | } |
| 1325 | break; |
| 1326 | |
| 1327 | case SIOCSTGSZ : |
| 1328 | if (softn->ipf_nat_lock) { |
| 1329 | error = ipf_nat_getsz(softc, data, getlock); |
| 1330 | } else { |
| 1331 | IPFERROR(60017); |
| 1332 | error = EACCES; |
| 1333 | } |
| 1334 | break; |
| 1335 | |
| 1336 | case SIOCSTGET : |
| 1337 | if (softn->ipf_nat_lock) { |
| 1338 | error = ipf_nat_getent(softc, data, getlock); |
| 1339 | } else { |
| 1340 | IPFERROR(60018); |
| 1341 | error = EACCES; |
| 1342 | } |
| 1343 | break; |
| 1344 | |
| 1345 | case SIOCGENITER : |
| 1346 | { |
| 1347 | ipfgeniter_t iter; |
| 1348 | ipftoken_t *token; |
| 1349 | ipfobj_t obj; |
| 1350 | |
| 1351 | error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER); |
| 1352 | if (error != 0) |
| 1353 | break; |
| 1354 | |
| 1355 | SPL_SCHED(s); |
| 1356 | token = ipf_token_find(softc, iter.igi_type, uid, ctx); |
| 1357 | if (token != NULL) { |
| 1358 | error = ipf_nat_iterator(softc, token, &iter, &obj); |
| 1359 | WRITE_ENTER(&softc->ipf_tokens); |
| 1360 | ipf_token_deref(softc, token); |
| 1361 | RWLOCK_EXIT(&softc->ipf_tokens); |
| 1362 | } |
| 1363 | SPL_X(s); |
| 1364 | break; |
| 1365 | } |
| 1366 | |
| 1367 | case SIOCIPFDELTOK : |
| 1368 | error = BCOPYIN(data, &arg, sizeof(arg)); |
| 1369 | if (error == 0) { |
| 1370 | SPL_SCHED(s); |
| 1371 | error = ipf_token_del(softc, arg, uid, ctx); |
| 1372 | SPL_X(s); |
| 1373 | } else { |
| 1374 | IPFERROR(60019); |
| 1375 | error = EFAULT; |
| 1376 | } |
| 1377 | break; |
| 1378 | |
| 1379 | case SIOCGTQTAB : |
| 1380 | error = ipf_outobj(softc, data, softn->ipf_nat_tcptq, |
| 1381 | IPFOBJ_STATETQTAB); |
| 1382 | break; |
| 1383 | |
| 1384 | case SIOCGTABL : |
| 1385 | error = ipf_nat_gettable(softc, softn, data); |
| 1386 | break; |
| 1387 | |
| 1388 | default : |
| 1389 | IPFERROR(60020); |
| 1390 | error = EINVAL; |
| 1391 | break; |
| 1392 | } |
| 1393 | done: |
| 1394 | if (nat != NULL) |
| 1395 | ipf_nat_rule_fini(softc, nat); |
| 1396 | if (nt != NULL) |
| 1397 | KFREES(nt, nt->in_size); |
| 1398 | return error; |
| 1399 | } |
| 1400 | |
| 1401 | |
| 1402 | /* ------------------------------------------------------------------------ */ |
| 1403 | /* Function: ipf_nat_siocaddnat */ |
| 1404 | /* Returns: int - 0 == success, != 0 == failure */ |
| 1405 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1406 | /* softn(I) - pointer to NAT context structure */ |
| 1407 | /* n(I) - pointer to new NAT rule */ |
| 1408 | /* np(I) - pointer to where to insert new NAT rule */ |
| 1409 | /* getlock(I) - flag indicating if lock on is held */ |
| 1410 | /* Mutex Locks: ipf_nat_io */ |
| 1411 | /* */ |
| 1412 | /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ |
| 1413 | /* from information passed to the kernel, then add it to the appropriate */ |
| 1414 | /* NAT rule table(s). */ |
| 1415 | /* ------------------------------------------------------------------------ */ |
| 1416 | static int |
| 1417 | ipf_nat_siocaddnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, |
| 1418 | int getlock) |
| 1419 | { |
| 1420 | int error = 0; |
| 1421 | |
| 1422 | if (ipf_nat_resolverule(softc, n) != 0) { |
| 1423 | IPFERROR(60022); |
| 1424 | return ENOENT; |
| 1425 | } |
| 1426 | |
| 1427 | if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) { |
| 1428 | IPFERROR(60023); |
| 1429 | return EINVAL; |
| 1430 | } |
| 1431 | |
| 1432 | if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { |
| 1433 | /* |
| 1434 | * Prerecord whether or not the destination of the divert |
| 1435 | * is local or not to the interface the packet is going |
| 1436 | * to be sent out. |
| 1437 | */ |
| 1438 | n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], |
| 1439 | n->in_ifps[1], &n->in_ndstip6); |
| 1440 | } |
| 1441 | |
| 1442 | if (getlock) { |
| 1443 | WRITE_ENTER(&softc->ipf_nat); |
| 1444 | } |
| 1445 | n->in_next = NULL; |
| 1446 | n->in_pnext = softn->ipf_nat_list_tail; |
| 1447 | *n->in_pnext = n; |
| 1448 | softn->ipf_nat_list_tail = &n->in_next; |
| 1449 | n->in_use++; |
| 1450 | |
| 1451 | if (n->in_redir & NAT_REDIRECT) { |
| 1452 | n->in_flags &= ~IPN_NOTDST; |
| 1453 | switch (n->in_v[0]) |
| 1454 | { |
| 1455 | case 4 : |
| 1456 | ipf_nat_addrdr(softn, n); |
| 1457 | break; |
| 1458 | #ifdef USE_INET6 |
| 1459 | case 6 : |
| 1460 | ipf_nat6_addrdr(softn, n); |
| 1461 | break; |
| 1462 | #endif |
| 1463 | default : |
| 1464 | break; |
| 1465 | } |
| 1466 | ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr); |
| 1467 | } |
| 1468 | |
| 1469 | if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { |
| 1470 | n->in_flags &= ~IPN_NOTSRC; |
| 1471 | switch (n->in_v[0]) |
| 1472 | { |
| 1473 | case 4 : |
| 1474 | ipf_nat_addmap(softn, n); |
| 1475 | break; |
| 1476 | #ifdef USE_INET6 |
| 1477 | case 6 : |
| 1478 | ipf_nat6_addmap(softn, n); |
| 1479 | break; |
| 1480 | #endif |
| 1481 | default : |
| 1482 | break; |
| 1483 | } |
| 1484 | ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map); |
| 1485 | } |
| 1486 | |
| 1487 | if (n->in_age[0] != 0) |
| 1488 | n->in_tqehead[0] = ipf_addtimeoutqueue(softc, |
| 1489 | &softn->ipf_nat_utqe, |
| 1490 | n->in_age[0]); |
| 1491 | |
| 1492 | if (n->in_age[1] != 0) |
| 1493 | n->in_tqehead[1] = ipf_addtimeoutqueue(softc, |
| 1494 | &softn->ipf_nat_utqe, |
| 1495 | n->in_age[1]); |
| 1496 | |
| 1497 | MUTEX_INIT(&n->in_lock, "ipnat rule lock" ); |
| 1498 | |
| 1499 | n = NULL; |
| 1500 | ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); |
| 1501 | #if SOLARIS && !defined(INSTANCES) |
| 1502 | pfil_delayed_copy = 0; |
| 1503 | #endif |
| 1504 | if (getlock) { |
| 1505 | RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */ |
| 1506 | } |
| 1507 | |
| 1508 | return error; |
| 1509 | } |
| 1510 | |
| 1511 | |
| 1512 | /* ------------------------------------------------------------------------ */ |
| 1513 | /* Function: ipf_nat_ruleaddrinit */ |
| 1514 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1515 | /* softn(I) - pointer to NAT context structure */ |
| 1516 | /* n(I) - pointer to NAT rule */ |
| 1517 | /* */ |
| 1518 | /* Initialise all of the NAT address structures in a NAT rule. */ |
| 1519 | /* ------------------------------------------------------------------------ */ |
| 1520 | static int |
| 1521 | ipf_nat_ruleaddrinit(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, |
| 1522 | ipnat_t *n) |
| 1523 | { |
| 1524 | int idx, error; |
| 1525 | |
| 1526 | if ((n->in_ndst.na_atype == FRI_LOOKUP) && |
| 1527 | (n->in_ndst.na_type != IPLT_DSTLIST)) { |
| 1528 | IPFERROR(60071); |
| 1529 | return EINVAL; |
| 1530 | } |
| 1531 | if ((n->in_nsrc.na_atype == FRI_LOOKUP) && |
| 1532 | (n->in_nsrc.na_type != IPLT_DSTLIST)) { |
| 1533 | IPFERROR(60069); |
| 1534 | return EINVAL; |
| 1535 | } |
| 1536 | |
| 1537 | if (n->in_redir == NAT_BIMAP) { |
| 1538 | n->in_ndstaddr = n->in_osrcaddr; |
| 1539 | n->in_ndstmsk = n->in_osrcmsk; |
| 1540 | n->in_odstaddr = n->in_nsrcaddr; |
| 1541 | n->in_odstmsk = n->in_nsrcmsk; |
| 1542 | |
| 1543 | } |
| 1544 | |
| 1545 | if (n->in_redir & NAT_REDIRECT) |
| 1546 | idx = 1; |
| 1547 | else |
| 1548 | idx = 0; |
| 1549 | /* |
| 1550 | * Initialise all of the address fields. |
| 1551 | */ |
| 1552 | error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1, |
| 1553 | n->in_ifps[idx]); |
| 1554 | if (error != 0) |
| 1555 | return error; |
| 1556 | |
| 1557 | error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1, |
| 1558 | n->in_ifps[idx]); |
| 1559 | if (error != 0) |
| 1560 | return error; |
| 1561 | |
| 1562 | error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1, |
| 1563 | n->in_ifps[idx]); |
| 1564 | if (error != 0) |
| 1565 | return error; |
| 1566 | |
| 1567 | error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1, |
| 1568 | n->in_ifps[idx]); |
| 1569 | if (error != 0) |
| 1570 | return error; |
| 1571 | |
| 1572 | if (n->in_redir & NAT_DIVERTUDP) |
| 1573 | ipf_nat_builddivertmp(softn, n); |
| 1574 | |
| 1575 | return 0; |
| 1576 | } |
| 1577 | |
| 1578 | |
| 1579 | /* ------------------------------------------------------------------------ */ |
| 1580 | /* Function: ipf_nat_resolvrule */ |
| 1581 | /* Returns: Nil */ |
| 1582 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1583 | /* n(I) - pointer to NAT rule */ |
| 1584 | /* */ |
| 1585 | /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ |
| 1586 | /* from information passed to the kernel, then add it to the appropriate */ |
| 1587 | /* NAT rule table(s). */ |
| 1588 | /* ------------------------------------------------------------------------ */ |
| 1589 | static int |
| 1590 | ipf_nat_resolverule(ipf_main_softc_t *softc, ipnat_t *n) |
| 1591 | { |
| 1592 | char *base; |
| 1593 | |
| 1594 | base = n->in_names; |
| 1595 | |
| 1596 | n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0], |
| 1597 | n->in_v[0]); |
| 1598 | |
| 1599 | if (n->in_ifnames[1] == -1) { |
| 1600 | n->in_ifnames[1] = n->in_ifnames[0]; |
| 1601 | n->in_ifps[1] = n->in_ifps[0]; |
| 1602 | } else { |
| 1603 | n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1], |
| 1604 | n->in_v[1]); |
| 1605 | } |
| 1606 | |
| 1607 | if (n->in_plabel != -1) { |
| 1608 | if (n->in_redir & NAT_REDIRECT) |
| 1609 | n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, |
| 1610 | n->in_pr[0], |
| 1611 | base + n->in_plabel); |
| 1612 | else |
| 1613 | n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, |
| 1614 | n->in_pr[1], |
| 1615 | base + n->in_plabel); |
| 1616 | if (n->in_apr == NULL) |
| 1617 | return -1; |
| 1618 | } |
| 1619 | return 0; |
| 1620 | } |
| 1621 | |
| 1622 | |
| 1623 | /* ------------------------------------------------------------------------ */ |
| 1624 | /* Function: ipf_nat_siocdelnat */ |
| 1625 | /* Returns: int - 0 == success, != 0 == failure */ |
| 1626 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1627 | /* softn(I) - pointer to NAT context structure */ |
| 1628 | /* n(I) - pointer to new NAT rule */ |
| 1629 | /* getlock(I) - flag indicating if lock on is held */ |
| 1630 | /* Mutex Locks: ipf_nat_io */ |
| 1631 | /* */ |
| 1632 | /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ |
| 1633 | /* from information passed to the kernel, then add it to the appropriate */ |
| 1634 | /* NAT rule table(s). */ |
| 1635 | /* ------------------------------------------------------------------------ */ |
| 1636 | static void |
| 1637 | ipf_nat_siocdelnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, |
| 1638 | int getlock) |
| 1639 | { |
| 1640 | #ifdef IPF_NAT6 |
| 1641 | int i; |
| 1642 | #endif |
| 1643 | |
| 1644 | if (getlock) { |
| 1645 | WRITE_ENTER(&softc->ipf_nat); |
| 1646 | } |
| 1647 | |
| 1648 | ipf_nat_delrule(softc, softn, n, 1); |
| 1649 | |
| 1650 | if (getlock) { |
| 1651 | RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */ |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | |
| 1656 | /* ------------------------------------------------------------------------ */ |
| 1657 | /* Function: ipf_nat_getsz */ |
| 1658 | /* Returns: int - 0 == success, != 0 is the error value. */ |
| 1659 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1660 | /* data(I) - pointer to natget structure with kernel */ |
| 1661 | /* pointer get the size of. */ |
| 1662 | /* getlock(I) - flag indicating whether or not the caller */ |
| 1663 | /* holds a lock on ipf_nat */ |
| 1664 | /* */ |
| 1665 | /* Handle SIOCSTGSZ. */ |
| 1666 | /* Return the size of the nat list entry to be copied back to user space. */ |
| 1667 | /* The size of the entry is stored in the ng_sz field and the enture natget */ |
| 1668 | /* structure is copied back to the user. */ |
| 1669 | /* ------------------------------------------------------------------------ */ |
| 1670 | static int |
| 1671 | ipf_nat_getsz(ipf_main_softc_t *softc, void *data, int getlock) |
| 1672 | { |
| 1673 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1674 | ap_session_t *aps; |
| 1675 | nat_t *nat, *n; |
| 1676 | natget_t ng; |
| 1677 | int error; |
| 1678 | |
| 1679 | error = BCOPYIN(data, &ng, sizeof(ng)); |
| 1680 | if (error != 0) { |
| 1681 | IPFERROR(60024); |
| 1682 | return EFAULT; |
| 1683 | } |
| 1684 | |
| 1685 | if (getlock) { |
| 1686 | READ_ENTER(&softc->ipf_nat); |
| 1687 | } |
| 1688 | |
| 1689 | nat = ng.ng_ptr; |
| 1690 | if (!nat) { |
| 1691 | nat = softn->ipf_nat_instances; |
| 1692 | ng.ng_sz = 0; |
| 1693 | /* |
| 1694 | * Empty list so the size returned is 0. Simple. |
| 1695 | */ |
| 1696 | if (nat == NULL) { |
| 1697 | if (getlock) { |
| 1698 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1699 | } |
| 1700 | error = BCOPYOUT(&ng, data, sizeof(ng)); |
| 1701 | if (error != 0) { |
| 1702 | IPFERROR(60025); |
| 1703 | return EFAULT; |
| 1704 | } |
| 1705 | return 0; |
| 1706 | } |
| 1707 | } else { |
| 1708 | /* |
| 1709 | * Make sure the pointer we're copying from exists in the |
| 1710 | * current list of entries. Security precaution to prevent |
| 1711 | * copying of random kernel data. |
| 1712 | */ |
| 1713 | for (n = softn->ipf_nat_instances; n; n = n->nat_next) |
| 1714 | if (n == nat) |
| 1715 | break; |
| 1716 | if (n == NULL) { |
| 1717 | if (getlock) { |
| 1718 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1719 | } |
| 1720 | IPFERROR(60026); |
| 1721 | return ESRCH; |
| 1722 | } |
| 1723 | } |
| 1724 | |
| 1725 | /* |
| 1726 | * Incluse any space required for proxy data structures. |
| 1727 | */ |
| 1728 | ng.ng_sz = sizeof(nat_save_t); |
| 1729 | aps = nat->nat_aps; |
| 1730 | if (aps != NULL) { |
| 1731 | ng.ng_sz += sizeof(ap_session_t) - 4; |
| 1732 | if (aps->aps_data != 0) |
| 1733 | ng.ng_sz += aps->aps_psiz; |
| 1734 | } |
| 1735 | if (getlock) { |
| 1736 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1737 | } |
| 1738 | |
| 1739 | error = BCOPYOUT(&ng, data, sizeof(ng)); |
| 1740 | if (error != 0) { |
| 1741 | IPFERROR(60027); |
| 1742 | return EFAULT; |
| 1743 | } |
| 1744 | return 0; |
| 1745 | } |
| 1746 | |
| 1747 | |
| 1748 | /* ------------------------------------------------------------------------ */ |
| 1749 | /* Function: ipf_nat_getent */ |
| 1750 | /* Returns: int - 0 == success, != 0 is the error value. */ |
| 1751 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1752 | /* data(I) - pointer to natget structure with kernel pointer*/ |
| 1753 | /* to NAT structure to copy out. */ |
| 1754 | /* getlock(I) - flag indicating whether or not the caller */ |
| 1755 | /* holds a lock on ipf_nat */ |
| 1756 | /* */ |
| 1757 | /* Handle SIOCSTGET. */ |
| 1758 | /* Copies out NAT entry to user space. Any additional data held for a */ |
| 1759 | /* proxy is also copied, as to is the NAT rule which was responsible for it */ |
| 1760 | /* ------------------------------------------------------------------------ */ |
| 1761 | static int |
| 1762 | ipf_nat_getent(ipf_main_softc_t *softc, void *data, int getlock) |
| 1763 | { |
| 1764 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1765 | int error, outsize; |
| 1766 | ap_session_t *aps; |
| 1767 | nat_save_t *ipn, ipns; |
| 1768 | nat_t *n, *nat; |
| 1769 | |
| 1770 | error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE); |
| 1771 | if (error != 0) |
| 1772 | return error; |
| 1773 | |
| 1774 | if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) { |
| 1775 | IPFERROR(60028); |
| 1776 | return EINVAL; |
| 1777 | } |
| 1778 | |
| 1779 | KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize); |
| 1780 | if (ipn == NULL) { |
| 1781 | IPFERROR(60029); |
| 1782 | return ENOMEM; |
| 1783 | } |
| 1784 | |
| 1785 | if (getlock) { |
| 1786 | READ_ENTER(&softc->ipf_nat); |
| 1787 | } |
| 1788 | |
| 1789 | ipn->ipn_dsize = ipns.ipn_dsize; |
| 1790 | nat = ipns.ipn_next; |
| 1791 | if (nat == NULL) { |
| 1792 | nat = softn->ipf_nat_instances; |
| 1793 | if (nat == NULL) { |
| 1794 | if (softn->ipf_nat_instances == NULL) { |
| 1795 | IPFERROR(60030); |
| 1796 | error = ENOENT; |
| 1797 | } |
| 1798 | goto finished; |
| 1799 | } |
| 1800 | } else { |
| 1801 | /* |
| 1802 | * Make sure the pointer we're copying from exists in the |
| 1803 | * current list of entries. Security precaution to prevent |
| 1804 | * copying of random kernel data. |
| 1805 | */ |
| 1806 | for (n = softn->ipf_nat_instances; n; n = n->nat_next) |
| 1807 | if (n == nat) |
| 1808 | break; |
| 1809 | if (n == NULL) { |
| 1810 | IPFERROR(60031); |
| 1811 | error = ESRCH; |
| 1812 | goto finished; |
| 1813 | } |
| 1814 | } |
| 1815 | ipn->ipn_next = nat->nat_next; |
| 1816 | |
| 1817 | /* |
| 1818 | * Copy the NAT structure. |
| 1819 | */ |
| 1820 | bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat)); |
| 1821 | |
| 1822 | /* |
| 1823 | * If we have a pointer to the NAT rule it belongs to, save that too. |
| 1824 | */ |
| 1825 | if (nat->nat_ptr != NULL) |
| 1826 | bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat, |
| 1827 | ipn->ipn_ipnat.in_size); |
| 1828 | |
| 1829 | /* |
| 1830 | * If we also know the NAT entry has an associated filter rule, |
| 1831 | * save that too. |
| 1832 | */ |
| 1833 | if (nat->nat_fr != NULL) |
| 1834 | bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr, |
| 1835 | sizeof(ipn->ipn_fr)); |
| 1836 | |
| 1837 | /* |
| 1838 | * Last but not least, if there is an application proxy session set |
| 1839 | * up for this NAT entry, then copy that out too, including any |
| 1840 | * private data saved along side it by the proxy. |
| 1841 | */ |
| 1842 | aps = nat->nat_aps; |
| 1843 | outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data); |
| 1844 | if (aps != NULL) { |
| 1845 | char *s; |
| 1846 | |
| 1847 | if (outsize < sizeof(*aps)) { |
| 1848 | IPFERROR(60032); |
| 1849 | error = ENOBUFS; |
| 1850 | goto finished; |
| 1851 | } |
| 1852 | |
| 1853 | s = ipn->ipn_data; |
| 1854 | bcopy((char *)aps, s, sizeof(*aps)); |
| 1855 | s += sizeof(*aps); |
| 1856 | outsize -= sizeof(*aps); |
| 1857 | if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz)) |
| 1858 | bcopy(aps->aps_data, s, aps->aps_psiz); |
| 1859 | else { |
| 1860 | IPFERROR(60033); |
| 1861 | error = ENOBUFS; |
| 1862 | } |
| 1863 | } |
| 1864 | if (error == 0) { |
| 1865 | if (getlock) { |
| 1866 | READ_ENTER(&softc->ipf_nat); |
| 1867 | getlock = 0; |
| 1868 | } |
| 1869 | error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE, |
| 1870 | ipns.ipn_dsize); |
| 1871 | } |
| 1872 | |
| 1873 | finished: |
| 1874 | if (getlock) { |
| 1875 | READ_ENTER(&softc->ipf_nat); |
| 1876 | } |
| 1877 | if (ipn != NULL) { |
| 1878 | KFREES(ipn, ipns.ipn_dsize); |
| 1879 | } |
| 1880 | return error; |
| 1881 | } |
| 1882 | |
| 1883 | |
| 1884 | /* ------------------------------------------------------------------------ */ |
| 1885 | /* Function: ipf_nat_putent */ |
| 1886 | /* Returns: int - 0 == success, != 0 is the error value. */ |
| 1887 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1888 | /* data(I) - pointer to natget structure with NAT */ |
| 1889 | /* structure information to load into the kernel */ |
| 1890 | /* getlock(I) - flag indicating whether or not a write lock */ |
| 1891 | /* on is already held. */ |
| 1892 | /* */ |
| 1893 | /* Handle SIOCSTPUT. */ |
| 1894 | /* Loads a NAT table entry from user space, including a NAT rule, proxy and */ |
| 1895 | /* firewall rule data structures, if pointers to them indicate so. */ |
| 1896 | /* ------------------------------------------------------------------------ */ |
| 1897 | static int |
| 1898 | ipf_nat_putent(ipf_main_softc_t *softc, void *data, int getlock) |
| 1899 | { |
| 1900 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1901 | nat_save_t *ipn, *ipnn; |
| 1902 | ap_session_t *aps; |
| 1903 | nat_t *n, *nat; |
| 1904 | frentry_t *fr; |
| 1905 | fr_info_t *fin; |
| 1906 | ipnat_t *in; |
| 1907 | int error; |
| 1908 | |
| 1909 | KMALLOC(ipn, nat_save_t *); |
| 1910 | if (ipn == NULL) |
| 1911 | return ENOMEM; |
| 1912 | error = ipf_inobj(softc, data, NULL, ipn, IPFOBJ_NATSAVE); |
| 1913 | if (error != 0) |
| 1914 | return error; |
| 1915 | |
| 1916 | /* |
| 1917 | * Initialise early because of code at junkput label. |
| 1918 | */ |
| 1919 | n = NULL; |
| 1920 | in = NULL; |
| 1921 | aps = NULL; |
| 1922 | nat = NULL; |
| 1923 | ipnn = NULL; |
| 1924 | fin = NULL; |
| 1925 | fr = NULL; |
| 1926 | |
| 1927 | /* |
| 1928 | * New entry, copy in the rest of the NAT entry if it's size is more |
| 1929 | * than just the nat_t structure. |
| 1930 | */ |
| 1931 | if (ipn->ipn_dsize > sizeof(*ipn)) { |
| 1932 | if (ipn->ipn_dsize > 81920) { |
| 1933 | IPFERROR(60034); |
| 1934 | error = ENOMEM; |
| 1935 | goto junkput; |
| 1936 | } |
| 1937 | |
| 1938 | KMALLOCS(ipnn, nat_save_t *, ipn->ipn_dsize); |
| 1939 | if (ipnn == NULL) { |
| 1940 | IPFERROR(60035); |
| 1941 | return ENOMEM; |
| 1942 | } |
| 1943 | |
| 1944 | bzero(ipnn, ipn->ipn_dsize); |
| 1945 | error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE, |
| 1946 | ipn->ipn_dsize); |
| 1947 | if (error != 0) { |
| 1948 | goto junkput; |
| 1949 | } |
| 1950 | } else |
| 1951 | ipnn = ipn; |
| 1952 | |
| 1953 | KMALLOC(nat, nat_t *); |
| 1954 | if (nat == NULL) { |
| 1955 | IPFERROR(60037); |
| 1956 | error = ENOMEM; |
| 1957 | goto junkput; |
| 1958 | } |
| 1959 | |
| 1960 | bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat)); |
| 1961 | |
| 1962 | switch (nat->nat_v[0]) |
| 1963 | { |
| 1964 | case 4: |
| 1965 | #ifdef USE_IENT6 |
| 1966 | case 6 : |
| 1967 | #endif |
| 1968 | break; |
| 1969 | default : |
| 1970 | IPFERROR(60061); |
| 1971 | error = EPROTONOSUPPORT; |
| 1972 | goto junkput; |
| 1973 | /*NOTREACHED*/ |
| 1974 | } |
| 1975 | |
| 1976 | /* |
| 1977 | * Initialize all these so that ipf_nat_delete() doesn't cause a crash. |
| 1978 | */ |
| 1979 | bzero((char *)nat, offsetof(struct nat, nat_tqe)); |
| 1980 | nat->nat_tqe.tqe_pnext = NULL; |
| 1981 | nat->nat_tqe.tqe_next = NULL; |
| 1982 | nat->nat_tqe.tqe_ifq = NULL; |
| 1983 | nat->nat_tqe.tqe_parent = nat; |
| 1984 | |
| 1985 | /* |
| 1986 | * Restore the rule associated with this nat session |
| 1987 | */ |
| 1988 | in = ipnn->ipn_nat.nat_ptr; |
| 1989 | if (in != NULL) { |
| 1990 | KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size); |
| 1991 | nat->nat_ptr = in; |
| 1992 | if (in == NULL) { |
| 1993 | IPFERROR(60038); |
| 1994 | error = ENOMEM; |
| 1995 | goto junkput; |
| 1996 | } |
| 1997 | bcopy((char *)&ipnn->ipn_ipnat, (char *)in, |
| 1998 | ipnn->ipn_ipnat.in_size); |
| 1999 | in->in_use = 1; |
| 2000 | in->in_flags |= IPN_DELETE; |
| 2001 | |
| 2002 | ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); |
| 2003 | |
| 2004 | if (ipf_nat_resolverule(softc, in) != 0) { |
| 2005 | IPFERROR(60039); |
| 2006 | error = ESRCH; |
| 2007 | goto junkput; |
| 2008 | } |
| 2009 | } |
| 2010 | |
| 2011 | /* |
| 2012 | * Check that the NAT entry doesn't already exist in the kernel. |
| 2013 | * |
| 2014 | * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do |
| 2015 | * this, we check to see if the inbound combination of addresses and |
| 2016 | * ports is already known. Similar logic is applied for NAT_INBOUND. |
| 2017 | * |
| 2018 | */ |
| 2019 | KMALLOC(fin, fr_info_t *); |
| 2020 | if (fin == NULL) { |
| 2021 | error = ENOMEM; |
| 2022 | goto junkput; |
| 2023 | } |
| 2024 | bzero(fin, sizeof(*fin)); |
| 2025 | fin->fin_v = nat->nat_v[0]; |
| 2026 | fin->fin_p = nat->nat_pr[0]; |
| 2027 | fin->fin_rev = nat->nat_rev; |
| 2028 | fin->fin_ifp = nat->nat_ifps[0]; |
| 2029 | fin->fin_data[0] = ntohs(nat->nat_ndport); |
| 2030 | fin->fin_data[1] = ntohs(nat->nat_nsport); |
| 2031 | |
| 2032 | switch (nat->nat_dir) |
| 2033 | { |
| 2034 | case NAT_OUTBOUND : |
| 2035 | case NAT_DIVERTOUT : |
| 2036 | if (getlock) { |
| 2037 | READ_ENTER(&softc->ipf_nat); |
| 2038 | } |
| 2039 | |
| 2040 | fin->fin_v = nat->nat_v[1]; |
| 2041 | if (nat->nat_v[1] == 4) { |
| 2042 | n = ipf_nat_inlookup(fin, nat->nat_flags, fin->fin_p, |
| 2043 | nat->nat_ndstip, nat->nat_nsrcip); |
| 2044 | #ifdef USE_INET6 |
| 2045 | } else if (nat->nat_v[1] == 6) { |
| 2046 | n = ipf_nat6_inlookup(fin, nat->nat_flags, fin->fin_p, |
| 2047 | &nat->nat_ndst6.in6, |
| 2048 | &nat->nat_nsrc6.in6); |
| 2049 | #endif |
| 2050 | } |
| 2051 | |
| 2052 | if (getlock) { |
| 2053 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2054 | } |
| 2055 | if (n != NULL) { |
| 2056 | IPFERROR(60040); |
| 2057 | error = EEXIST; |
| 2058 | goto junkput; |
| 2059 | } |
| 2060 | break; |
| 2061 | |
| 2062 | case NAT_INBOUND : |
| 2063 | case NAT_DIVERTIN : |
| 2064 | if (getlock) { |
| 2065 | READ_ENTER(&softc->ipf_nat); |
| 2066 | } |
| 2067 | |
| 2068 | if (fin->fin_v == 4) { |
| 2069 | n = ipf_nat_outlookup(fin, nat->nat_flags, fin->fin_p, |
| 2070 | nat->nat_ndstip, |
| 2071 | nat->nat_nsrcip); |
| 2072 | #ifdef USE_INET6 |
| 2073 | } else if (fin->fin_v == 6) { |
| 2074 | n = ipf_nat6_outlookup(fin, nat->nat_flags, fin->fin_p, |
| 2075 | &nat->nat_ndst6.in6, |
| 2076 | &nat->nat_nsrc6.in6); |
| 2077 | #endif |
| 2078 | } |
| 2079 | |
| 2080 | if (getlock) { |
| 2081 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2082 | } |
| 2083 | if (n != NULL) { |
| 2084 | IPFERROR(60041); |
| 2085 | error = EEXIST; |
| 2086 | goto junkput; |
| 2087 | } |
| 2088 | break; |
| 2089 | |
| 2090 | default : |
| 2091 | IPFERROR(60042); |
| 2092 | error = EINVAL; |
| 2093 | goto junkput; |
| 2094 | } |
| 2095 | |
| 2096 | /* |
| 2097 | * Restore ap_session_t structure. Include the private data allocated |
| 2098 | * if it was there. |
| 2099 | */ |
| 2100 | aps = nat->nat_aps; |
| 2101 | if (aps != NULL) { |
| 2102 | KMALLOC(aps, ap_session_t *); |
| 2103 | nat->nat_aps = aps; |
| 2104 | if (aps == NULL) { |
| 2105 | IPFERROR(60043); |
| 2106 | error = ENOMEM; |
| 2107 | goto junkput; |
| 2108 | } |
| 2109 | bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps)); |
| 2110 | if (in != NULL) |
| 2111 | aps->aps_apr = in->in_apr; |
| 2112 | else |
| 2113 | aps->aps_apr = NULL; |
| 2114 | if (aps->aps_psiz != 0) { |
| 2115 | if (aps->aps_psiz > 81920) { |
| 2116 | IPFERROR(60044); |
| 2117 | error = ENOMEM; |
| 2118 | goto junkput; |
| 2119 | } |
| 2120 | KMALLOCS(aps->aps_data, void *, aps->aps_psiz); |
| 2121 | if (aps->aps_data == NULL) { |
| 2122 | IPFERROR(60045); |
| 2123 | error = ENOMEM; |
| 2124 | goto junkput; |
| 2125 | } |
| 2126 | bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data, |
| 2127 | aps->aps_psiz); |
| 2128 | } else { |
| 2129 | aps->aps_psiz = 0; |
| 2130 | aps->aps_data = NULL; |
| 2131 | } |
| 2132 | } |
| 2133 | |
| 2134 | /* |
| 2135 | * If there was a filtering rule associated with this entry then |
| 2136 | * build up a new one. |
| 2137 | */ |
| 2138 | fr = nat->nat_fr; |
| 2139 | if (fr != NULL) { |
| 2140 | if ((nat->nat_flags & SI_NEWFR) != 0) { |
| 2141 | KMALLOC(fr, frentry_t *); |
| 2142 | nat->nat_fr = fr; |
| 2143 | if (fr == NULL) { |
| 2144 | IPFERROR(60046); |
| 2145 | error = ENOMEM; |
| 2146 | goto junkput; |
| 2147 | } |
| 2148 | ipnn->ipn_nat.nat_fr = fr; |
| 2149 | fr->fr_ref = 1; |
| 2150 | (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE); |
| 2151 | bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr)); |
| 2152 | |
| 2153 | fr->fr_ref = 1; |
| 2154 | fr->fr_dsize = 0; |
| 2155 | fr->fr_data = NULL; |
| 2156 | fr->fr_type = FR_T_NONE; |
| 2157 | |
| 2158 | MUTEX_NUKE(&fr->fr_lock); |
| 2159 | MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock" ); |
| 2160 | } else { |
| 2161 | if (getlock) { |
| 2162 | READ_ENTER(&softc->ipf_nat); |
| 2163 | } |
| 2164 | for (n = softn->ipf_nat_instances; n; n = n->nat_next) |
| 2165 | if (n->nat_fr == fr) |
| 2166 | break; |
| 2167 | |
| 2168 | if (n != NULL) { |
| 2169 | MUTEX_ENTER(&fr->fr_lock); |
| 2170 | fr->fr_ref++; |
| 2171 | MUTEX_EXIT(&fr->fr_lock); |
| 2172 | } |
| 2173 | if (getlock) { |
| 2174 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2175 | } |
| 2176 | |
| 2177 | if (n == NULL) { |
| 2178 | IPFERROR(60047); |
| 2179 | error = ESRCH; |
| 2180 | goto junkput; |
| 2181 | } |
| 2182 | } |
| 2183 | } |
| 2184 | |
| 2185 | if (ipnn != ipn) { |
| 2186 | KFREES(ipnn, ipn->ipn_dsize); |
| 2187 | ipnn = NULL; |
| 2188 | } |
| 2189 | |
| 2190 | if (getlock) { |
| 2191 | WRITE_ENTER(&softc->ipf_nat); |
| 2192 | } |
| 2193 | |
| 2194 | if (fin->fin_v == 4) |
| 2195 | error = ipf_nat_finalise(fin, nat); |
| 2196 | #ifdef USE_INET6 |
| 2197 | else |
| 2198 | error = ipf_nat6_finalise(fin, nat); |
| 2199 | #endif |
| 2200 | |
| 2201 | if (getlock) { |
| 2202 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2203 | } |
| 2204 | |
| 2205 | if (error == 0) |
| 2206 | return 0; |
| 2207 | |
| 2208 | IPFERROR(60048); |
| 2209 | error = ENOMEM; |
| 2210 | |
| 2211 | junkput: |
| 2212 | if (fin != NULL) |
| 2213 | KFREE(fin); |
| 2214 | if (fr != NULL) { |
| 2215 | (void) ipf_derefrule(softc, &fr); |
| 2216 | } |
| 2217 | |
| 2218 | if ((ipnn != NULL) && (ipnn != ipn)) { |
| 2219 | KFREES(ipnn, ipn->ipn_dsize); |
| 2220 | } |
| 2221 | if (ipn != NULL) |
| 2222 | KFREE(ipn); |
| 2223 | if (nat != NULL) { |
| 2224 | if (aps != NULL) { |
| 2225 | if (aps->aps_data != NULL) { |
| 2226 | KFREES(aps->aps_data, aps->aps_psiz); |
| 2227 | } |
| 2228 | KFREE(aps); |
| 2229 | } |
| 2230 | if (in != NULL) { |
| 2231 | if (in->in_apr) |
| 2232 | ipf_proxy_deref(in->in_apr); |
| 2233 | KFREES(in, in->in_size); |
| 2234 | } |
| 2235 | KFREE(nat); |
| 2236 | } |
| 2237 | return error; |
| 2238 | } |
| 2239 | |
| 2240 | |
| 2241 | /* ------------------------------------------------------------------------ */ |
| 2242 | /* Function: ipf_nat_delete */ |
| 2243 | /* Returns: Nil */ |
| 2244 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 2245 | /* nat(I) - pointer to NAT structure to delete */ |
| 2246 | /* logtype(I) - type of LOG record to create before deleting */ |
| 2247 | /* Write Lock: ipf_nat */ |
| 2248 | /* */ |
| 2249 | /* Delete a nat entry from the various lists and table. If NAT logging is */ |
| 2250 | /* enabled then generate a NAT log record for this event. */ |
| 2251 | /* ------------------------------------------------------------------------ */ |
| 2252 | void |
| 2253 | ipf_nat_delete(ipf_main_softc_t *softc, struct nat *nat, int logtype) |
| 2254 | { |
| 2255 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2256 | int madeorphan = 0, removed = 0; |
| 2257 | u_int bkt; |
| 2258 | nat_stat_side_t *nss; |
| 2259 | struct ipnat *ipn; |
| 2260 | |
| 2261 | if (logtype != 0 && softn->ipf_nat_logging != 0) |
| 2262 | ipf_nat_log(softc, softn, nat, logtype); |
| 2263 | |
| 2264 | /* |
| 2265 | * Take it as a general indication that all the pointers are set if |
| 2266 | * nat_pnext is set. |
| 2267 | */ |
| 2268 | if (nat->nat_pnext != NULL) { |
| 2269 | removed = 1; |
| 2270 | |
| 2271 | bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 2272 | nss = &softn->ipf_nat_stats.ns_side[0]; |
| 2273 | ASSERT(nss->ns_bucketlen[bkt] > 0); |
| 2274 | nss->ns_bucketlen[bkt]--; |
| 2275 | if (nss->ns_bucketlen[bkt] == 0) { |
| 2276 | nss->ns_inuse--; |
| 2277 | } |
| 2278 | |
| 2279 | bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 2280 | nss = &softn->ipf_nat_stats.ns_side[1]; |
| 2281 | ASSERT(nss->ns_bucketlen[bkt] > 0); |
| 2282 | nss->ns_bucketlen[bkt]--; |
| 2283 | if (nss->ns_bucketlen[bkt] == 0) { |
| 2284 | nss->ns_inuse--; |
| 2285 | } |
| 2286 | |
| 2287 | *nat->nat_pnext = nat->nat_next; |
| 2288 | if (nat->nat_next != NULL) { |
| 2289 | nat->nat_next->nat_pnext = nat->nat_pnext; |
| 2290 | nat->nat_next = NULL; |
| 2291 | } |
| 2292 | nat->nat_pnext = NULL; |
| 2293 | |
| 2294 | *nat->nat_phnext[0] = nat->nat_hnext[0]; |
| 2295 | if (nat->nat_hnext[0] != NULL) { |
| 2296 | nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; |
| 2297 | nat->nat_hnext[0] = NULL; |
| 2298 | } |
| 2299 | nat->nat_phnext[0] = NULL; |
| 2300 | |
| 2301 | *nat->nat_phnext[1] = nat->nat_hnext[1]; |
| 2302 | if (nat->nat_hnext[1] != NULL) { |
| 2303 | nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; |
| 2304 | nat->nat_hnext[1] = NULL; |
| 2305 | } |
| 2306 | nat->nat_phnext[1] = NULL; |
| 2307 | |
| 2308 | if ((nat->nat_flags & SI_WILDP) != 0) { |
| 2309 | ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds); |
| 2310 | } |
| 2311 | madeorphan = 1; |
| 2312 | } |
| 2313 | |
| 2314 | if (nat->nat_me != NULL) { |
| 2315 | *nat->nat_me = NULL; |
| 2316 | nat->nat_me = NULL; |
| 2317 | nat->nat_ref--; |
| 2318 | ASSERT(nat->nat_ref >= 0); |
| 2319 | } |
| 2320 | |
| 2321 | if (nat->nat_tqe.tqe_ifq != NULL) { |
| 2322 | /* |
| 2323 | * No call to ipf_freetimeoutqueue() is made here, they are |
| 2324 | * garbage collected in ipf_nat_expire(). |
| 2325 | */ |
| 2326 | (void) ipf_deletequeueentry(&nat->nat_tqe); |
| 2327 | } |
| 2328 | |
| 2329 | if (nat->nat_sync) { |
| 2330 | ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); |
| 2331 | nat->nat_sync = NULL; |
| 2332 | } |
| 2333 | |
| 2334 | if (logtype == NL_EXPIRE) |
| 2335 | softn->ipf_nat_stats.ns_expire++; |
| 2336 | |
| 2337 | MUTEX_ENTER(&nat->nat_lock); |
| 2338 | /* |
| 2339 | * NL_DESTROY should only be passed in when we've got nat_ref >= 2. |
| 2340 | * This happens when a nat'd packet is blocked and we want to throw |
| 2341 | * away the NAT session. |
| 2342 | */ |
| 2343 | if (logtype == NL_DESTROY) { |
| 2344 | if (nat->nat_ref > 2) { |
| 2345 | nat->nat_ref -= 2; |
| 2346 | MUTEX_EXIT(&nat->nat_lock); |
| 2347 | if (removed) |
| 2348 | softn->ipf_nat_stats.ns_orphans++; |
| 2349 | return; |
| 2350 | } |
| 2351 | } else if (nat->nat_ref > 1) { |
| 2352 | nat->nat_ref--; |
| 2353 | MUTEX_EXIT(&nat->nat_lock); |
| 2354 | if (madeorphan == 1) |
| 2355 | softn->ipf_nat_stats.ns_orphans++; |
| 2356 | return; |
| 2357 | } |
| 2358 | ASSERT(nat->nat_ref >= 0); |
| 2359 | MUTEX_EXIT(&nat->nat_lock); |
| 2360 | |
| 2361 | nat->nat_ref = 0; |
| 2362 | |
| 2363 | if (madeorphan == 0) |
| 2364 | softn->ipf_nat_stats.ns_orphans--; |
| 2365 | |
| 2366 | /* |
| 2367 | * At this point, nat_ref can be either 0 or -1 |
| 2368 | */ |
| 2369 | softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--; |
| 2370 | |
| 2371 | if (nat->nat_fr != NULL) { |
| 2372 | (void) ipf_derefrule(softc, &nat->nat_fr); |
| 2373 | } |
| 2374 | |
| 2375 | if (nat->nat_hm != NULL) { |
| 2376 | ipf_nat_hostmapdel(softc, &nat->nat_hm); |
| 2377 | } |
| 2378 | |
| 2379 | /* |
| 2380 | * If there is an active reference from the nat entry to its parent |
| 2381 | * rule, decrement the rule's reference count and free it too if no |
| 2382 | * longer being used. |
| 2383 | */ |
| 2384 | ipn = nat->nat_ptr; |
| 2385 | nat->nat_ptr = NULL; |
| 2386 | |
| 2387 | if (ipn != NULL) { |
| 2388 | ipn->in_space++; |
| 2389 | ipf_nat_rule_deref(softc, &ipn); |
| 2390 | } |
| 2391 | |
| 2392 | if (nat->nat_aps != NULL) { |
| 2393 | ipf_proxy_free(softc, nat->nat_aps); |
| 2394 | nat->nat_aps = NULL; |
| 2395 | } |
| 2396 | |
| 2397 | MUTEX_DESTROY(&nat->nat_lock); |
| 2398 | |
| 2399 | softn->ipf_nat_stats.ns_active--; |
| 2400 | |
| 2401 | /* |
| 2402 | * If there's a fragment table entry too for this nat entry, then |
| 2403 | * dereference that as well. This is after nat_lock is released |
| 2404 | * because of Tru64. |
| 2405 | */ |
| 2406 | ipf_frag_natforget(softc, (void *)nat); |
| 2407 | |
| 2408 | KFREE(nat); |
| 2409 | } |
| 2410 | |
| 2411 | |
| 2412 | /* ------------------------------------------------------------------------ */ |
| 2413 | /* Function: ipf_nat_flushtable */ |
| 2414 | /* Returns: int - number of NAT rules deleted */ |
| 2415 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 2416 | /* softn(I) - pointer to NAT context structure */ |
| 2417 | /* Write Lock: ipf_nat */ |
| 2418 | /* */ |
| 2419 | /* Deletes all currently active NAT sessions. In deleting each NAT entry a */ |
| 2420 | /* log record should be emitted in ipf_nat_delete() if NAT logging is */ |
| 2421 | /* enabled. */ |
| 2422 | /* ------------------------------------------------------------------------ */ |
| 2423 | /* |
| 2424 | * nat_flushtable - clear the NAT table of all mapping entries. |
| 2425 | */ |
| 2426 | static int |
| 2427 | ipf_nat_flushtable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) |
| 2428 | { |
| 2429 | nat_t *nat; |
| 2430 | int j = 0; |
| 2431 | |
| 2432 | /* |
| 2433 | * ALL NAT mappings deleted, so lets just make the deletions |
| 2434 | * quicker. |
| 2435 | */ |
| 2436 | if (softn->ipf_nat_table[0] != NULL) |
| 2437 | bzero((char *)softn->ipf_nat_table[0], |
| 2438 | sizeof(softn->ipf_nat_table[0]) * |
| 2439 | softn->ipf_nat_table_sz); |
| 2440 | if (softn->ipf_nat_table[1] != NULL) |
| 2441 | bzero((char *)softn->ipf_nat_table[1], |
| 2442 | sizeof(softn->ipf_nat_table[1]) * |
| 2443 | softn->ipf_nat_table_sz); |
| 2444 | |
| 2445 | while ((nat = softn->ipf_nat_instances) != NULL) { |
| 2446 | ipf_nat_delete(softc, nat, NL_FLUSH); |
| 2447 | j++; |
| 2448 | } |
| 2449 | |
| 2450 | return j; |
| 2451 | } |
| 2452 | |
| 2453 | |
| 2454 | /* ------------------------------------------------------------------------ */ |
| 2455 | /* Function: ipf_nat_clearlist */ |
| 2456 | /* Returns: int - number of NAT/RDR rules deleted */ |
| 2457 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 2458 | /* softn(I) - pointer to NAT context structure */ |
| 2459 | /* */ |
| 2460 | /* Delete all rules in the current list of rules. There is nothing elegant */ |
| 2461 | /* about this cleanup: simply free all entries on the list of rules and */ |
| 2462 | /* clear out the tables used for hashed NAT rule lookups. */ |
| 2463 | /* ------------------------------------------------------------------------ */ |
| 2464 | static int |
| 2465 | ipf_nat_clearlist(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) |
| 2466 | { |
| 2467 | ipnat_t *n; |
| 2468 | int i = 0; |
| 2469 | |
| 2470 | if (softn->ipf_nat_map_rules != NULL) { |
| 2471 | bzero((char *)softn->ipf_nat_map_rules, |
| 2472 | sizeof(*softn->ipf_nat_map_rules) * |
| 2473 | softn->ipf_nat_maprules_sz); |
| 2474 | } |
| 2475 | if (softn->ipf_nat_rdr_rules != NULL) { |
| 2476 | bzero((char *)softn->ipf_nat_rdr_rules, |
| 2477 | sizeof(*softn->ipf_nat_rdr_rules) * |
| 2478 | softn->ipf_nat_rdrrules_sz); |
| 2479 | } |
| 2480 | |
| 2481 | while ((n = softn->ipf_nat_list) != NULL) { |
| 2482 | ipf_nat_delrule(softc, softn, n, 0); |
| 2483 | i++; |
| 2484 | } |
| 2485 | #if SOLARIS && !defined(INSTANCES) |
| 2486 | pfil_delayed_copy = 1; |
| 2487 | #endif |
| 2488 | return i; |
| 2489 | } |
| 2490 | |
| 2491 | |
| 2492 | /* ------------------------------------------------------------------------ */ |
| 2493 | /* Function: ipf_nat_delrule */ |
| 2494 | /* Returns: Nil */ |
| 2495 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 2496 | /* softn(I) - pointer to NAT context structure */ |
| 2497 | /* np(I) - pointer to NAT rule to delete */ |
| 2498 | /* purge(I) - 1 == allow purge, 0 == prevent purge */ |
| 2499 | /* Locks: WRITE(ipf_nat) */ |
| 2500 | /* */ |
| 2501 | /* Preventing "purge" from occuring is allowed because when all of the NAT */ |
| 2502 | /* rules are being removed, allowing the "purge" to walk through the list */ |
| 2503 | /* of NAT sessions, possibly multiple times, would be a large performance */ |
| 2504 | /* hit, on the order of O(N^2). */ |
| 2505 | /* ------------------------------------------------------------------------ */ |
| 2506 | static void |
| 2507 | ipf_nat_delrule(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *np, |
| 2508 | int purge) |
| 2509 | { |
| 2510 | |
| 2511 | if (np->in_pnext != NULL) { |
| 2512 | *np->in_pnext = np->in_next; |
| 2513 | if (np->in_next != NULL) |
| 2514 | np->in_next->in_pnext = np->in_pnext; |
| 2515 | if (softn->ipf_nat_list_tail == &np->in_next) |
| 2516 | softn->ipf_nat_list_tail = np->in_pnext; |
| 2517 | } |
| 2518 | |
| 2519 | if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) { |
| 2520 | nat_t *next; |
| 2521 | nat_t *nat; |
| 2522 | |
| 2523 | for (next = softn->ipf_nat_instances; (nat = next) != NULL;) { |
| 2524 | next = nat->nat_next; |
| 2525 | if (nat->nat_ptr == np) |
| 2526 | ipf_nat_delete(softc, nat, NL_PURGE); |
| 2527 | } |
| 2528 | } |
| 2529 | |
| 2530 | if ((np->in_flags & IPN_DELETE) == 0) { |
| 2531 | if (np->in_redir & NAT_REDIRECT) { |
| 2532 | switch (np->in_v[0]) |
| 2533 | { |
| 2534 | case 4 : |
| 2535 | ipf_nat_delrdr(softn, np); |
| 2536 | break; |
| 2537 | #ifdef USE_INET6 |
| 2538 | case 6 : |
| 2539 | ipf_nat6_delrdr(softn, np); |
| 2540 | break; |
| 2541 | #endif |
| 2542 | } |
| 2543 | } |
| 2544 | if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) { |
| 2545 | switch (np->in_v[0]) |
| 2546 | { |
| 2547 | case 4 : |
| 2548 | ipf_nat_delmap(softn, np); |
| 2549 | break; |
| 2550 | #ifdef USE_INET6 |
| 2551 | case 6 : |
| 2552 | ipf_nat6_delmap(softn, np); |
| 2553 | break; |
| 2554 | #endif |
| 2555 | } |
| 2556 | } |
| 2557 | } |
| 2558 | |
| 2559 | np->in_flags |= IPN_DELETE; |
| 2560 | ipf_nat_rule_deref(softc, &np); |
| 2561 | } |
| 2562 | |
| 2563 | |
| 2564 | /* ------------------------------------------------------------------------ */ |
| 2565 | /* Function: ipf_nat_newmap */ |
| 2566 | /* Returns: int - -1 == error, 0 == success */ |
| 2567 | /* Parameters: fin(I) - pointer to packet information */ |
| 2568 | /* nat(I) - pointer to NAT entry */ |
| 2569 | /* ni(I) - pointer to structure with misc. information needed */ |
| 2570 | /* to create new NAT entry. */ |
| 2571 | /* */ |
| 2572 | /* Given an empty NAT structure, populate it with new information about a */ |
| 2573 | /* new NAT session, as defined by the matching NAT rule. */ |
| 2574 | /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ |
| 2575 | /* to the new IP address for the translation. */ |
| 2576 | /* ------------------------------------------------------------------------ */ |
| 2577 | static int |
| 2578 | ipf_nat_newmap(fr_info_t *fin, nat_t *nat, natinfo_t *ni) |
| 2579 | { |
| 2580 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2581 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2582 | u_short st_port, dport, sport, port, sp, dp; |
| 2583 | struct in_addr in, inb; |
| 2584 | hostmap_t *hm; |
| 2585 | u_32_t flags; |
| 2586 | u_32_t st_ip; |
| 2587 | ipnat_t *np; |
| 2588 | nat_t *natl; |
| 2589 | int l; |
| 2590 | |
| 2591 | /* |
| 2592 | * If it's an outbound packet which doesn't match any existing |
| 2593 | * record, then create a new port |
| 2594 | */ |
| 2595 | l = 0; |
| 2596 | hm = NULL; |
| 2597 | np = ni->nai_np; |
| 2598 | st_ip = np->in_snip; |
| 2599 | st_port = np->in_spnext; |
| 2600 | flags = nat->nat_flags; |
| 2601 | |
| 2602 | if (flags & IPN_ICMPQUERY) { |
| 2603 | sport = fin->fin_data[1]; |
| 2604 | dport = 0; |
| 2605 | } else { |
| 2606 | sport = htons(fin->fin_data[0]); |
| 2607 | dport = htons(fin->fin_data[1]); |
| 2608 | } |
| 2609 | |
| 2610 | /* |
| 2611 | * Do a loop until we either run out of entries to try or we find |
| 2612 | * a NAT mapping that isn't currently being used. This is done |
| 2613 | * because the change to the source is not (usually) being fixed. |
| 2614 | */ |
| 2615 | do { |
| 2616 | port = 0; |
| 2617 | in.s_addr = htonl(np->in_snip); |
| 2618 | if (l == 0) { |
| 2619 | /* |
| 2620 | * Check to see if there is an existing NAT |
| 2621 | * setup for this IP address pair. |
| 2622 | */ |
| 2623 | hm = ipf_nat_hostmap(softn, np, fin->fin_src, |
| 2624 | fin->fin_dst, in, 0); |
| 2625 | if (hm != NULL) |
| 2626 | in.s_addr = hm->hm_nsrcip.s_addr; |
| 2627 | } else if ((l == 1) && (hm != NULL)) { |
| 2628 | ipf_nat_hostmapdel(softc, &hm); |
| 2629 | } |
| 2630 | in.s_addr = ntohl(in.s_addr); |
| 2631 | |
| 2632 | nat->nat_hm = hm; |
| 2633 | |
| 2634 | if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) { |
| 2635 | if (l > 0) { |
| 2636 | NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1); |
| 2637 | return -1; |
| 2638 | } |
| 2639 | } |
| 2640 | |
| 2641 | if (np->in_redir == NAT_BIMAP && |
| 2642 | np->in_osrcmsk == np->in_nsrcmsk) { |
| 2643 | /* |
| 2644 | * map the address block in a 1:1 fashion |
| 2645 | */ |
| 2646 | in.s_addr = np->in_nsrcaddr; |
| 2647 | in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk; |
| 2648 | in.s_addr = ntohl(in.s_addr); |
| 2649 | |
| 2650 | } else if (np->in_redir & NAT_MAPBLK) { |
| 2651 | if ((l >= np->in_ppip) || ((l > 0) && |
| 2652 | !(flags & IPN_TCPUDP))) { |
| 2653 | NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2); |
| 2654 | return -1; |
| 2655 | } |
| 2656 | /* |
| 2657 | * map-block - Calculate destination address. |
| 2658 | */ |
| 2659 | in.s_addr = ntohl(fin->fin_saddr); |
| 2660 | in.s_addr &= ntohl(~np->in_osrcmsk); |
| 2661 | inb.s_addr = in.s_addr; |
| 2662 | in.s_addr /= np->in_ippip; |
| 2663 | in.s_addr &= ntohl(~np->in_nsrcmsk); |
| 2664 | in.s_addr += ntohl(np->in_nsrcaddr); |
| 2665 | /* |
| 2666 | * Calculate destination port. |
| 2667 | */ |
| 2668 | if ((flags & IPN_TCPUDP) && |
| 2669 | (np->in_ppip != 0)) { |
| 2670 | port = ntohs(sport) + l; |
| 2671 | port %= np->in_ppip; |
| 2672 | port += np->in_ppip * |
| 2673 | (inb.s_addr % np->in_ippip); |
| 2674 | port += MAPBLK_MINPORT; |
| 2675 | port = htons(port); |
| 2676 | } |
| 2677 | |
| 2678 | } else if ((np->in_nsrcaddr == 0) && |
| 2679 | (np->in_nsrcmsk == 0xffffffff)) { |
| 2680 | i6addr_t in6; |
| 2681 | |
| 2682 | /* |
| 2683 | * 0/32 - use the interface's IP address. |
| 2684 | */ |
| 2685 | if ((l > 0) || |
| 2686 | ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, |
| 2687 | &in6, NULL) == -1) { |
| 2688 | NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1); |
| 2689 | return -1; |
| 2690 | } |
| 2691 | in.s_addr = ntohl(in6.in4.s_addr); |
| 2692 | |
| 2693 | } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { |
| 2694 | /* |
| 2695 | * 0/0 - use the original source address/port. |
| 2696 | */ |
| 2697 | if (l > 0) { |
| 2698 | NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3); |
| 2699 | return -1; |
| 2700 | } |
| 2701 | in.s_addr = ntohl(fin->fin_saddr); |
| 2702 | |
| 2703 | } else if ((np->in_nsrcmsk != 0xffffffff) && |
| 2704 | (np->in_spnext == 0) && ((l > 0) || (hm == NULL))) |
| 2705 | np->in_snip++; |
| 2706 | |
| 2707 | natl = NULL; |
| 2708 | |
| 2709 | if ((flags & IPN_TCPUDP) && |
| 2710 | ((np->in_redir & NAT_MAPBLK) == 0) && |
| 2711 | (np->in_flags & IPN_AUTOPORTMAP)) { |
| 2712 | /* |
| 2713 | * "ports auto" (without map-block) |
| 2714 | */ |
| 2715 | if ((l > 0) && np->in_ppip && (l % np->in_ppip == 0)) { |
| 2716 | if (l > np->in_space) { |
| 2717 | return -1; |
| 2718 | } else if ((l > np->in_ppip) && |
| 2719 | np->in_nsrcmsk != 0xffffffff) |
| 2720 | np->in_snip++; |
| 2721 | } |
| 2722 | if (np->in_ppip != 0) { |
| 2723 | port = ntohs(sport); |
| 2724 | port += (l % np->in_ppip); |
| 2725 | port %= np->in_ppip; |
| 2726 | port += np->in_ppip * |
| 2727 | (ntohl(fin->fin_saddr) % |
| 2728 | np->in_ippip); |
| 2729 | port += MAPBLK_MINPORT; |
| 2730 | port = htons(port); |
| 2731 | } |
| 2732 | |
| 2733 | } else if (((np->in_redir & NAT_MAPBLK) == 0) && |
| 2734 | (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) { |
| 2735 | /* |
| 2736 | * Standard port translation. Select next port. |
| 2737 | */ |
| 2738 | if (np->in_flags & IPN_SEQUENTIAL) { |
| 2739 | port = np->in_spnext; |
| 2740 | } else { |
| 2741 | port = ipf_random() % (np->in_spmax - |
| 2742 | np->in_spmin + 1); |
| 2743 | port += np->in_spmin; |
| 2744 | } |
| 2745 | port = htons(port); |
| 2746 | np->in_spnext++; |
| 2747 | |
| 2748 | if (np->in_spnext > np->in_spmax) { |
| 2749 | np->in_spnext = np->in_spmin; |
| 2750 | if (np->in_nsrcmsk != 0xffffffff) |
| 2751 | np->in_snip++; |
| 2752 | } |
| 2753 | } |
| 2754 | |
| 2755 | if (np->in_flags & IPN_SIPRANGE) { |
| 2756 | if (np->in_snip > ntohl(np->in_nsrcmsk)) |
| 2757 | np->in_snip = ntohl(np->in_nsrcaddr); |
| 2758 | } else { |
| 2759 | if ((np->in_nsrcmsk != 0xffffffff) && |
| 2760 | ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) > |
| 2761 | ntohl(np->in_nsrcaddr)) |
| 2762 | np->in_snip = ntohl(np->in_nsrcaddr) + 1; |
| 2763 | } |
| 2764 | |
| 2765 | if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY))) |
| 2766 | port = sport; |
| 2767 | |
| 2768 | /* |
| 2769 | * Here we do a lookup of the connection as seen from |
| 2770 | * the outside. If an IP# pair already exists, try |
| 2771 | * again. So if you have A->B becomes C->B, you can |
| 2772 | * also have D->E become C->E but not D->B causing |
| 2773 | * another C->B. Also take protocol and ports into |
| 2774 | * account when determining whether a pre-existing |
| 2775 | * NAT setup will cause an external conflict where |
| 2776 | * this is appropriate. |
| 2777 | */ |
| 2778 | inb.s_addr = htonl(in.s_addr); |
| 2779 | sp = fin->fin_data[0]; |
| 2780 | dp = fin->fin_data[1]; |
| 2781 | fin->fin_data[0] = fin->fin_data[1]; |
| 2782 | fin->fin_data[1] = ntohs(port); |
| 2783 | natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), |
| 2784 | (u_int)fin->fin_p, fin->fin_dst, inb); |
| 2785 | fin->fin_data[0] = sp; |
| 2786 | fin->fin_data[1] = dp; |
| 2787 | |
| 2788 | /* |
| 2789 | * Has the search wrapped around and come back to the |
| 2790 | * start ? |
| 2791 | */ |
| 2792 | if ((natl != NULL) && |
| 2793 | (np->in_spnext != 0) && (st_port == np->in_spnext) && |
| 2794 | (np->in_snip != 0) && (st_ip == np->in_snip)) { |
| 2795 | NBUMPSIDED(1, ns_wrap); |
| 2796 | return -1; |
| 2797 | } |
| 2798 | l++; |
| 2799 | } while (natl != NULL); |
| 2800 | |
| 2801 | /* Setup the NAT table */ |
| 2802 | nat->nat_osrcip = fin->fin_src; |
| 2803 | nat->nat_nsrcaddr = htonl(in.s_addr); |
| 2804 | nat->nat_odstip = fin->fin_dst; |
| 2805 | nat->nat_ndstip = fin->fin_dst; |
| 2806 | if (nat->nat_hm == NULL) |
| 2807 | nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, |
| 2808 | fin->fin_dst, nat->nat_nsrcip, |
| 2809 | 0); |
| 2810 | |
| 2811 | if (flags & IPN_TCPUDP) { |
| 2812 | nat->nat_osport = sport; |
| 2813 | nat->nat_nsport = port; /* sport */ |
| 2814 | nat->nat_odport = dport; |
| 2815 | nat->nat_ndport = dport; |
| 2816 | ((tcphdr_t *)fin->fin_dp)->th_sport = port; |
| 2817 | } else if (flags & IPN_ICMPQUERY) { |
| 2818 | nat->nat_oicmpid = fin->fin_data[1]; |
| 2819 | ((icmphdr_t *)fin->fin_dp)->icmp_id = port; |
| 2820 | nat->nat_nicmpid = port; |
| 2821 | } |
| 2822 | return 0; |
| 2823 | } |
| 2824 | |
| 2825 | |
| 2826 | /* ------------------------------------------------------------------------ */ |
| 2827 | /* Function: ipf_nat_newrdr */ |
| 2828 | /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ |
| 2829 | /* allow rule to be moved if IPN_ROUNDR is set. */ |
| 2830 | /* Parameters: fin(I) - pointer to packet information */ |
| 2831 | /* nat(I) - pointer to NAT entry */ |
| 2832 | /* ni(I) - pointer to structure with misc. information needed */ |
| 2833 | /* to create new NAT entry. */ |
| 2834 | /* */ |
| 2835 | /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ |
| 2836 | /* to the new IP address for the translation. */ |
| 2837 | /* ------------------------------------------------------------------------ */ |
| 2838 | static int |
| 2839 | ipf_nat_newrdr(fr_info_t *fin, nat_t *nat, natinfo_t *ni) |
| 2840 | { |
| 2841 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2842 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2843 | u_short nport, dport, sport; |
| 2844 | struct in_addr in, inb; |
| 2845 | u_short sp, dp; |
| 2846 | hostmap_t *hm; |
| 2847 | u_32_t flags; |
| 2848 | ipnat_t *np; |
| 2849 | nat_t *natl; |
| 2850 | int move; |
| 2851 | |
| 2852 | move = 1; |
| 2853 | hm = NULL; |
| 2854 | in.s_addr = 0; |
| 2855 | np = ni->nai_np; |
| 2856 | flags = nat->nat_flags; |
| 2857 | |
| 2858 | if (flags & IPN_ICMPQUERY) { |
| 2859 | dport = fin->fin_data[1]; |
| 2860 | sport = 0; |
| 2861 | } else { |
| 2862 | sport = htons(fin->fin_data[0]); |
| 2863 | dport = htons(fin->fin_data[1]); |
| 2864 | } |
| 2865 | |
| 2866 | /* TRACE sport, dport */ |
| 2867 | |
| 2868 | |
| 2869 | /* |
| 2870 | * If the matching rule has IPN_STICKY set, then we want to have the |
| 2871 | * same rule kick in as before. Why would this happen? If you have |
| 2872 | * a collection of rdr rules with "round-robin sticky", the current |
| 2873 | * packet might match a different one to the previous connection but |
| 2874 | * we want the same destination to be used. |
| 2875 | */ |
| 2876 | if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) && |
| 2877 | ((np->in_flags & IPN_STICKY) != 0)) { |
| 2878 | hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst, |
| 2879 | in, (u_32_t)dport); |
| 2880 | if (hm != NULL) { |
| 2881 | in.s_addr = ntohl(hm->hm_ndstip.s_addr); |
| 2882 | np = hm->hm_ipnat; |
| 2883 | ni->nai_np = np; |
| 2884 | move = 0; |
| 2885 | ipf_nat_hostmapdel(softc, &hm); |
| 2886 | } |
| 2887 | } |
| 2888 | |
| 2889 | /* |
| 2890 | * Otherwise, it's an inbound packet. Most likely, we don't |
| 2891 | * want to rewrite source ports and source addresses. Instead, |
| 2892 | * we want to rewrite to a fixed internal address and fixed |
| 2893 | * internal port. |
| 2894 | */ |
| 2895 | if (np->in_flags & IPN_SPLIT) { |
| 2896 | in.s_addr = np->in_dnip; |
| 2897 | inb.s_addr = htonl(in.s_addr); |
| 2898 | |
| 2899 | if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) { |
| 2900 | hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, |
| 2901 | fin->fin_dst, inb, (u_32_t)dport); |
| 2902 | if (hm != NULL) { |
| 2903 | in.s_addr = hm->hm_ndstip.s_addr; |
| 2904 | move = 0; |
| 2905 | } |
| 2906 | } |
| 2907 | |
| 2908 | if (hm == NULL || hm->hm_ref == 1) { |
| 2909 | if (np->in_ndstaddr == htonl(in.s_addr)) { |
| 2910 | np->in_dnip = ntohl(np->in_ndstmsk); |
| 2911 | move = 0; |
| 2912 | } else { |
| 2913 | np->in_dnip = ntohl(np->in_ndstaddr); |
| 2914 | } |
| 2915 | } |
| 2916 | if (hm != NULL) |
| 2917 | ipf_nat_hostmapdel(softc, &hm); |
| 2918 | |
| 2919 | } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { |
| 2920 | i6addr_t in6; |
| 2921 | |
| 2922 | /* |
| 2923 | * 0/32 - use the interface's IP address. |
| 2924 | */ |
| 2925 | if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, |
| 2926 | &in6, NULL) == -1) { |
| 2927 | NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2); |
| 2928 | return -1; |
| 2929 | } |
| 2930 | in.s_addr = ntohl(in6.in4.s_addr); |
| 2931 | |
| 2932 | } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) { |
| 2933 | /* |
| 2934 | * 0/0 - use the original destination address/port. |
| 2935 | */ |
| 2936 | in.s_addr = ntohl(fin->fin_daddr); |
| 2937 | |
| 2938 | } else if (np->in_redir == NAT_BIMAP && |
| 2939 | np->in_ndstmsk == np->in_odstmsk) { |
| 2940 | /* |
| 2941 | * map the address block in a 1:1 fashion |
| 2942 | */ |
| 2943 | in.s_addr = np->in_ndstaddr; |
| 2944 | in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk; |
| 2945 | in.s_addr = ntohl(in.s_addr); |
| 2946 | } else { |
| 2947 | in.s_addr = ntohl(np->in_ndstaddr); |
| 2948 | } |
| 2949 | |
| 2950 | if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0)) |
| 2951 | nport = dport; |
| 2952 | else { |
| 2953 | /* |
| 2954 | * Whilst not optimized for the case where |
| 2955 | * pmin == pmax, the gain is not significant. |
| 2956 | */ |
| 2957 | if (((np->in_flags & IPN_FIXEDDPORT) == 0) && |
| 2958 | (np->in_odport != np->in_dtop)) { |
| 2959 | nport = ntohs(dport) - np->in_odport + np->in_dpmax; |
| 2960 | nport = htons(nport); |
| 2961 | } else { |
| 2962 | nport = htons(np->in_dpnext); |
| 2963 | np->in_dpnext++; |
| 2964 | if (np->in_dpnext > np->in_dpmax) |
| 2965 | np->in_dpnext = np->in_dpmin; |
| 2966 | } |
| 2967 | } |
| 2968 | |
| 2969 | /* |
| 2970 | * When the redirect-to address is set to 0.0.0.0, just |
| 2971 | * assume a blank `forwarding' of the packet. We don't |
| 2972 | * setup any translation for this either. |
| 2973 | */ |
| 2974 | if (in.s_addr == 0) { |
| 2975 | if (nport == dport) { |
| 2976 | NBUMPSIDED(0, ns_xlate_null); |
| 2977 | return -1; |
| 2978 | } |
| 2979 | in.s_addr = ntohl(fin->fin_daddr); |
| 2980 | } |
| 2981 | |
| 2982 | /* |
| 2983 | * Check to see if this redirect mapping already exists and if |
| 2984 | * it does, return "failure" (allowing it to be created will just |
| 2985 | * cause one or both of these "connections" to stop working.) |
| 2986 | */ |
| 2987 | inb.s_addr = htonl(in.s_addr); |
| 2988 | sp = fin->fin_data[0]; |
| 2989 | dp = fin->fin_data[1]; |
| 2990 | fin->fin_data[1] = fin->fin_data[0]; |
| 2991 | fin->fin_data[0] = ntohs(nport); |
| 2992 | natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), |
| 2993 | (u_int)fin->fin_p, inb, fin->fin_src); |
| 2994 | fin->fin_data[0] = sp; |
| 2995 | fin->fin_data[1] = dp; |
| 2996 | if (natl != NULL) { |
| 2997 | DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl); |
| 2998 | NBUMPSIDE(0, ns_xlate_exists); |
| 2999 | return -1; |
| 3000 | } |
| 3001 | |
| 3002 | nat->nat_ndstaddr = htonl(in.s_addr); |
| 3003 | nat->nat_odstip = fin->fin_dst; |
| 3004 | nat->nat_nsrcip = fin->fin_src; |
| 3005 | nat->nat_osrcip = fin->fin_src; |
| 3006 | if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0)) |
| 3007 | nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, |
| 3008 | fin->fin_dst, inb, (u_32_t)dport); |
| 3009 | |
| 3010 | if (flags & IPN_TCPUDP) { |
| 3011 | nat->nat_odport = dport; |
| 3012 | nat->nat_ndport = nport; |
| 3013 | nat->nat_osport = sport; |
| 3014 | nat->nat_nsport = sport; |
| 3015 | ((tcphdr_t *)fin->fin_dp)->th_dport = nport; |
| 3016 | } else if (flags & IPN_ICMPQUERY) { |
| 3017 | nat->nat_oicmpid = fin->fin_data[1]; |
| 3018 | ((icmphdr_t *)fin->fin_dp)->icmp_id = nport; |
| 3019 | nat->nat_nicmpid = nport; |
| 3020 | } |
| 3021 | |
| 3022 | return move; |
| 3023 | } |
| 3024 | |
| 3025 | /* ------------------------------------------------------------------------ */ |
| 3026 | /* Function: ipf_nat_add */ |
| 3027 | /* Returns: nat_t* - NULL == failure to create new NAT structure, */ |
| 3028 | /* else pointer to new NAT structure */ |
| 3029 | /* Parameters: fin(I) - pointer to packet information */ |
| 3030 | /* np(I) - pointer to NAT rule */ |
| 3031 | /* natsave(I) - pointer to where to store NAT struct pointer */ |
| 3032 | /* flags(I) - flags describing the current packet */ |
| 3033 | /* direction(I) - direction of packet (in/out) */ |
| 3034 | /* Write Lock: ipf_nat */ |
| 3035 | /* */ |
| 3036 | /* Attempts to create a new NAT entry. Does not actually change the packet */ |
| 3037 | /* in any way. */ |
| 3038 | /* */ |
| 3039 | /* This function is in three main parts: (1) deal with creating a new NAT */ |
| 3040 | /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */ |
| 3041 | /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */ |
| 3042 | /* and (3) building that structure and putting it into the NAT table(s). */ |
| 3043 | /* */ |
| 3044 | /* NOTE: natsave should NOT be used to point back to an ipstate_t struct */ |
| 3045 | /* as it can result in memory being corrupted. */ |
| 3046 | /* ------------------------------------------------------------------------ */ |
| 3047 | nat_t * |
| 3048 | ipf_nat_add(fr_info_t *fin, ipnat_t *np, nat_t **natsave, u_int flags, |
| 3049 | int direction) |
| 3050 | { |
| 3051 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3052 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3053 | hostmap_t *hm = NULL; |
| 3054 | nat_t *nat, *natl; |
| 3055 | natstat_t *nsp; |
| 3056 | u_int nflags; |
| 3057 | natinfo_t ni; |
| 3058 | int move; |
| 3059 | |
| 3060 | memset(&ni, 0, sizeof ni); /* XXX gcc */ |
| 3061 | nsp = &softn->ipf_nat_stats; |
| 3062 | |
| 3063 | if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) > |
| 3064 | softn->ipf_nat_table_wm_high) { |
| 3065 | softn->ipf_nat_doflush = 1; |
| 3066 | } |
| 3067 | |
| 3068 | if (nsp->ns_active >= softn->ipf_nat_table_max) { |
| 3069 | NBUMPSIDED(fin->fin_out, ns_table_max); |
| 3070 | return NULL; |
| 3071 | } |
| 3072 | |
| 3073 | move = 1; |
| 3074 | nflags = np->in_flags & flags; |
| 3075 | nflags &= NAT_FROMRULE; |
| 3076 | |
| 3077 | ni.nai_np = np; |
| 3078 | ni.nai_dport = 0; |
| 3079 | ni.nai_sport = 0; |
| 3080 | |
| 3081 | /* Give me a new nat */ |
| 3082 | KMALLOC(nat, nat_t *); |
| 3083 | if (nat == NULL) { |
| 3084 | NBUMPSIDED(fin->fin_out, ns_memfail); |
| 3085 | /* |
| 3086 | * Try to automatically tune the max # of entries in the |
| 3087 | * table allowed to be less than what will cause kmem_alloc() |
| 3088 | * to fail and try to eliminate panics due to out of memory |
| 3089 | * conditions arising. |
| 3090 | */ |
| 3091 | if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) && |
| 3092 | (nsp->ns_active > 100)) { |
| 3093 | softn->ipf_nat_table_max = nsp->ns_active - 100; |
| 3094 | printf("table_max reduced to %d\n" , |
| 3095 | softn->ipf_nat_table_max); |
| 3096 | } |
| 3097 | return NULL; |
| 3098 | } |
| 3099 | |
| 3100 | if (flags & IPN_ICMPQUERY) { |
| 3101 | /* |
| 3102 | * In the ICMP query NAT code, we translate the ICMP id fields |
| 3103 | * to make them unique. This is indepedent of the ICMP type |
| 3104 | * (e.g. in the unlikely event that a host sends an echo and |
| 3105 | * an tstamp request with the same id, both packets will have |
| 3106 | * their ip address/id field changed in the same way). |
| 3107 | */ |
| 3108 | /* The icmp_id field is used by the sender to identify the |
| 3109 | * process making the icmp request. (the receiver justs |
| 3110 | * copies it back in its response). So, it closely matches |
| 3111 | * the concept of source port. We overlay sport, so we can |
| 3112 | * maximally reuse the existing code. |
| 3113 | */ |
| 3114 | ni.nai_sport = fin->fin_data[1]; |
| 3115 | ni.nai_dport = 0; |
| 3116 | } |
| 3117 | |
| 3118 | bzero((char *)nat, sizeof(*nat)); |
| 3119 | nat->nat_flags = flags; |
| 3120 | nat->nat_redir = np->in_redir; |
| 3121 | nat->nat_dir = direction; |
| 3122 | nat->nat_pr[0] = fin->fin_p; |
| 3123 | nat->nat_pr[1] = fin->fin_p; |
| 3124 | |
| 3125 | /* |
| 3126 | * Search the current table for a match and create a new mapping |
| 3127 | * if there is none found. |
| 3128 | */ |
| 3129 | if (np->in_redir & NAT_DIVERTUDP) { |
| 3130 | move = ipf_nat_newdivert(fin, nat, &ni); |
| 3131 | |
| 3132 | } else if (np->in_redir & NAT_REWRITE) { |
| 3133 | move = ipf_nat_newrewrite(fin, nat, &ni); |
| 3134 | |
| 3135 | } else if (direction == NAT_OUTBOUND) { |
| 3136 | /* |
| 3137 | * We can now arrange to call this for the same connection |
| 3138 | * because ipf_nat_new doesn't protect the code path into |
| 3139 | * this function. |
| 3140 | */ |
| 3141 | natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, |
| 3142 | fin->fin_src, fin->fin_dst); |
| 3143 | if (natl != NULL) { |
| 3144 | KFREE(nat); |
| 3145 | nat = natl; |
| 3146 | goto done; |
| 3147 | } |
| 3148 | |
| 3149 | move = ipf_nat_newmap(fin, nat, &ni); |
| 3150 | } else { |
| 3151 | /* |
| 3152 | * NAT_INBOUND is used for redirects rules |
| 3153 | */ |
| 3154 | natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, |
| 3155 | fin->fin_src, fin->fin_dst); |
| 3156 | if (natl != NULL) { |
| 3157 | KFREE(nat); |
| 3158 | nat = natl; |
| 3159 | goto done; |
| 3160 | } |
| 3161 | |
| 3162 | move = ipf_nat_newrdr(fin, nat, &ni); |
| 3163 | } |
| 3164 | if (move == -1) |
| 3165 | goto badnat; |
| 3166 | |
| 3167 | np = ni.nai_np; |
| 3168 | |
| 3169 | nat->nat_mssclamp = np->in_mssclamp; |
| 3170 | nat->nat_me = natsave; |
| 3171 | nat->nat_fr = fin->fin_fr; |
| 3172 | nat->nat_rev = fin->fin_rev; |
| 3173 | nat->nat_ptr = np; |
| 3174 | nat->nat_dlocal = np->in_dlocal; |
| 3175 | |
| 3176 | if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) { |
| 3177 | if (ipf_proxy_new(fin, nat) == -1) { |
| 3178 | NBUMPSIDED(fin->fin_out, ns_appr_fail); |
| 3179 | goto badnat; |
| 3180 | } |
| 3181 | } |
| 3182 | |
| 3183 | nat->nat_ifps[0] = np->in_ifps[0]; |
| 3184 | if (np->in_ifps[0] != NULL) { |
| 3185 | COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]); |
| 3186 | } |
| 3187 | |
| 3188 | nat->nat_ifps[1] = np->in_ifps[1]; |
| 3189 | if (np->in_ifps[1] != NULL) { |
| 3190 | COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]); |
| 3191 | } |
| 3192 | |
| 3193 | if (ipf_nat_finalise(fin, nat) == -1) { |
| 3194 | goto badnat; |
| 3195 | } |
| 3196 | |
| 3197 | np->in_use++; |
| 3198 | |
| 3199 | if ((move == 1) && (np->in_flags & IPN_ROUNDR)) { |
| 3200 | if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) { |
| 3201 | ipf_nat_delrdr(softn, np); |
| 3202 | ipf_nat_addrdr(softn, np); |
| 3203 | } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) { |
| 3204 | ipf_nat_delmap(softn, np); |
| 3205 | ipf_nat_addmap(softn, np); |
| 3206 | } |
| 3207 | } |
| 3208 | |
| 3209 | if (flags & SI_WILDP) |
| 3210 | nsp->ns_wilds++; |
| 3211 | nsp->ns_proto[nat->nat_pr[0]]++; |
| 3212 | |
| 3213 | goto done; |
| 3214 | badnat: |
| 3215 | DT2(ns_badnatnew, fr_info_t *, fin, nat_t *, nat); |
| 3216 | NBUMPSIDE(fin->fin_out, ns_badnatnew); |
| 3217 | if ((hm = nat->nat_hm) != NULL) |
| 3218 | ipf_nat_hostmapdel(softc, &hm); |
| 3219 | KFREE(nat); |
| 3220 | nat = NULL; |
| 3221 | done: |
| 3222 | if (nat != NULL && np != NULL) |
| 3223 | np->in_hits++; |
| 3224 | if (natsave != NULL) |
| 3225 | *natsave = nat; |
| 3226 | return nat; |
| 3227 | } |
| 3228 | |
| 3229 | |
| 3230 | /* ------------------------------------------------------------------------ */ |
| 3231 | /* Function: ipf_nat_finalise */ |
| 3232 | /* Returns: int - 0 == sucess, -1 == failure */ |
| 3233 | /* Parameters: fin(I) - pointer to packet information */ |
| 3234 | /* nat(I) - pointer to NAT entry */ |
| 3235 | /* Write Lock: ipf_nat */ |
| 3236 | /* */ |
| 3237 | /* This is the tail end of constructing a new NAT entry and is the same */ |
| 3238 | /* for both IPv4 and IPv6. */ |
| 3239 | /* ------------------------------------------------------------------------ */ |
| 3240 | /*ARGSUSED*/ |
| 3241 | static int |
| 3242 | ipf_nat_finalise(fr_info_t *fin, nat_t *nat) |
| 3243 | { |
| 3244 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3245 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3246 | u_32_t sum1, sum2, sumd; |
| 3247 | frentry_t *fr; |
| 3248 | #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC) |
| 3249 | qpktinfo_t *qpi = fin->fin_qpi; |
| 3250 | #endif |
| 3251 | |
| 3252 | switch (nat->nat_pr[0]) |
| 3253 | { |
| 3254 | case IPPROTO_ICMP : |
| 3255 | sum1 = LONG_SUM(ntohs(nat->nat_oicmpid)); |
| 3256 | sum2 = LONG_SUM(ntohs(nat->nat_nicmpid)); |
| 3257 | CALC_SUMD(sum1, sum2, sumd); |
| 3258 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 3259 | |
| 3260 | break; |
| 3261 | |
| 3262 | default : |
| 3263 | sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \ |
| 3264 | ntohs(nat->nat_osport)); |
| 3265 | sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \ |
| 3266 | ntohs(nat->nat_nsport)); |
| 3267 | CALC_SUMD(sum1, sum2, sumd); |
| 3268 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 3269 | |
| 3270 | sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \ |
| 3271 | ntohs(nat->nat_odport)); |
| 3272 | sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \ |
| 3273 | ntohs(nat->nat_ndport)); |
| 3274 | CALC_SUMD(sum1, sum2, sumd); |
| 3275 | nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); |
| 3276 | break; |
| 3277 | } |
| 3278 | |
| 3279 | /* |
| 3280 | * Compute the partial checksum, just in case. |
| 3281 | * This is only ever placed into outbound packets so care needs |
| 3282 | * to be taken over which pair of addresses are used. |
| 3283 | */ |
| 3284 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 3285 | sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); |
| 3286 | sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr)); |
| 3287 | } else { |
| 3288 | sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); |
| 3289 | sum1 += LONG_SUM(ntohl(nat->nat_odstaddr)); |
| 3290 | } |
| 3291 | sum1 += nat->nat_pr[1]; |
| 3292 | nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16); |
| 3293 | |
| 3294 | sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); |
| 3295 | sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); |
| 3296 | CALC_SUMD(sum1, sum2, sumd); |
| 3297 | nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16); |
| 3298 | |
| 3299 | sum1 = LONG_SUM(ntohl(nat->nat_odstaddr)); |
| 3300 | sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); |
| 3301 | CALC_SUMD(sum1, sum2, sumd); |
| 3302 | nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16); |
| 3303 | |
| 3304 | nat->nat_v[0] = 4; |
| 3305 | nat->nat_v[1] = 4; |
| 3306 | |
| 3307 | if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { |
| 3308 | nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); |
| 3309 | } |
| 3310 | |
| 3311 | if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { |
| 3312 | nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); |
| 3313 | } |
| 3314 | |
| 3315 | if ((nat->nat_flags & SI_CLONE) == 0) |
| 3316 | nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat); |
| 3317 | |
| 3318 | if (ipf_nat_insert(softc, softn, nat) == 0) { |
| 3319 | if (softn->ipf_nat_logging) |
| 3320 | ipf_nat_log(softc, softn, nat, NL_NEW); |
| 3321 | fr = nat->nat_fr; |
| 3322 | if (fr != NULL) { |
| 3323 | MUTEX_ENTER(&fr->fr_lock); |
| 3324 | fr->fr_ref++; |
| 3325 | MUTEX_EXIT(&fr->fr_lock); |
| 3326 | } |
| 3327 | return 0; |
| 3328 | } |
| 3329 | |
| 3330 | NBUMPSIDED(fin->fin_out, ns_unfinalised); |
| 3331 | /* |
| 3332 | * nat_insert failed, so cleanup time... |
| 3333 | */ |
| 3334 | if (nat->nat_sync != NULL) |
| 3335 | ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); |
| 3336 | return -1; |
| 3337 | } |
| 3338 | |
| 3339 | |
| 3340 | /* ------------------------------------------------------------------------ */ |
| 3341 | /* Function: ipf_nat_insert */ |
| 3342 | /* Returns: int - 0 == sucess, -1 == failure */ |
| 3343 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 3344 | /* softn(I) - pointer to NAT context structure */ |
| 3345 | /* nat(I) - pointer to NAT structure */ |
| 3346 | /* Write Lock: ipf_nat */ |
| 3347 | /* */ |
| 3348 | /* Insert a NAT entry into the hash tables for searching and add it to the */ |
| 3349 | /* list of active NAT entries. Adjust global counters when complete. */ |
| 3350 | /* ------------------------------------------------------------------------ */ |
| 3351 | int |
| 3352 | ipf_nat_insert(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) |
| 3353 | { |
| 3354 | u_int hv0, hv1; |
| 3355 | u_int sp, dp; |
| 3356 | ipnat_t *in; |
| 3357 | int ret; |
| 3358 | |
| 3359 | /* |
| 3360 | * Try and return an error as early as possible, so calculate the hash |
| 3361 | * entry numbers first and then proceed. |
| 3362 | */ |
| 3363 | if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) { |
| 3364 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 3365 | sp = nat->nat_osport; |
| 3366 | dp = nat->nat_odport; |
| 3367 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 3368 | sp = 0; |
| 3369 | dp = nat->nat_oicmpid; |
| 3370 | } else { |
| 3371 | sp = 0; |
| 3372 | dp = 0; |
| 3373 | } |
| 3374 | hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff); |
| 3375 | hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff); |
| 3376 | /* |
| 3377 | * TRACE nat_osrcaddr, nat_osport, nat_odstaddr, |
| 3378 | * nat_odport, hv0 |
| 3379 | */ |
| 3380 | |
| 3381 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 3382 | sp = nat->nat_nsport; |
| 3383 | dp = nat->nat_ndport; |
| 3384 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 3385 | sp = 0; |
| 3386 | dp = nat->nat_nicmpid; |
| 3387 | } else { |
| 3388 | sp = 0; |
| 3389 | dp = 0; |
| 3390 | } |
| 3391 | hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff); |
| 3392 | hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff); |
| 3393 | /* |
| 3394 | * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, |
| 3395 | * nat_ndport, hv1 |
| 3396 | */ |
| 3397 | } else { |
| 3398 | hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff); |
| 3399 | hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff); |
| 3400 | /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */ |
| 3401 | |
| 3402 | hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff); |
| 3403 | hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff); |
| 3404 | /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */ |
| 3405 | } |
| 3406 | |
| 3407 | if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { |
| 3408 | nat->nat_hv[0] = hv0; |
| 3409 | nat->nat_hv[1] = hv1; |
| 3410 | } else { |
| 3411 | nat->nat_hv[0] = hv1; |
| 3412 | nat->nat_hv[1] = hv0; |
| 3413 | } |
| 3414 | |
| 3415 | MUTEX_INIT(&nat->nat_lock, "nat entry lock" ); |
| 3416 | |
| 3417 | in = nat->nat_ptr; |
| 3418 | nat->nat_ref = nat->nat_me ? 2 : 1; |
| 3419 | |
| 3420 | nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0'; |
| 3421 | nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4); |
| 3422 | |
| 3423 | if (nat->nat_ifnames[1][0] != '\0') { |
| 3424 | nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; |
| 3425 | nat->nat_ifps[1] = ipf_resolvenic(softc, |
| 3426 | nat->nat_ifnames[1], 4); |
| 3427 | } else if (in->in_ifnames[1] != -1) { |
| 3428 | char *name; |
| 3429 | |
| 3430 | name = in->in_names + in->in_ifnames[1]; |
| 3431 | if (name[1] != '\0' && name[0] != '-' && name[0] != '*') { |
| 3432 | (void) strncpy(nat->nat_ifnames[1], |
| 3433 | nat->nat_ifnames[0], LIFNAMSIZ); |
| 3434 | nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; |
| 3435 | nat->nat_ifps[1] = nat->nat_ifps[0]; |
| 3436 | } |
| 3437 | } |
| 3438 | if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { |
| 3439 | nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); |
| 3440 | } |
| 3441 | if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { |
| 3442 | nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); |
| 3443 | } |
| 3444 | |
| 3445 | ret = ipf_nat_hashtab_add(softc, softn, nat); |
| 3446 | if (ret != 0) |
| 3447 | MUTEX_DESTROY(&nat->nat_lock); |
| 3448 | return ret; |
| 3449 | } |
| 3450 | |
| 3451 | |
| 3452 | /* ------------------------------------------------------------------------ */ |
| 3453 | /* Function: ipf_nat_hashtab_add */ |
| 3454 | /* Returns: int - 0 == sucess, -1 == failure */ |
| 3455 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 3456 | /* softn(I) - pointer to NAT context structure */ |
| 3457 | /* nat(I) - pointer to NAT structure */ |
| 3458 | /* Write Lock: ipf_nat */ |
| 3459 | /* */ |
| 3460 | /* Handle the insertion of a NAT entry into the table/list. */ |
| 3461 | /* ------------------------------------------------------------------------ */ |
| 3462 | int |
| 3463 | ipf_nat_hashtab_add(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) |
| 3464 | { |
| 3465 | nat_t **natp; |
| 3466 | u_int hv0; |
| 3467 | u_int hv1; |
| 3468 | |
| 3469 | hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 3470 | hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 3471 | |
| 3472 | if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >= |
| 3473 | softn->ipf_nat_maxbucket) { |
| 3474 | DT1(ns_bucket_max_0, int, |
| 3475 | softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]); |
| 3476 | NBUMPSIDE(0, ns_bucket_max); |
| 3477 | return -1; |
| 3478 | } |
| 3479 | |
| 3480 | if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >= |
| 3481 | softn->ipf_nat_maxbucket) { |
| 3482 | DT1(ns_bucket_max_1, int, |
| 3483 | softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]); |
| 3484 | NBUMPSIDE(1, ns_bucket_max); |
| 3485 | return -1; |
| 3486 | } |
| 3487 | |
| 3488 | /* |
| 3489 | * The ordering of operations in the list and hash table insertion |
| 3490 | * is very important. The last operation for each task should be |
| 3491 | * to update the top of the list, after all the "nexts" have been |
| 3492 | * done so that walking the list while it is being done does not |
| 3493 | * find strange pointers. |
| 3494 | * |
| 3495 | * Global list of NAT instances |
| 3496 | */ |
| 3497 | nat->nat_next = softn->ipf_nat_instances; |
| 3498 | nat->nat_pnext = &softn->ipf_nat_instances; |
| 3499 | if (softn->ipf_nat_instances) |
| 3500 | softn->ipf_nat_instances->nat_pnext = &nat->nat_next; |
| 3501 | softn->ipf_nat_instances = nat; |
| 3502 | |
| 3503 | /* |
| 3504 | * Inbound hash table. |
| 3505 | */ |
| 3506 | natp = &softn->ipf_nat_table[0][hv0]; |
| 3507 | nat->nat_phnext[0] = natp; |
| 3508 | nat->nat_hnext[0] = *natp; |
| 3509 | if (*natp) { |
| 3510 | (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; |
| 3511 | } else { |
| 3512 | NBUMPSIDE(0, ns_inuse); |
| 3513 | } |
| 3514 | *natp = nat; |
| 3515 | NBUMPSIDE(0, ns_bucketlen[hv0]); |
| 3516 | |
| 3517 | /* |
| 3518 | * Outbound hash table. |
| 3519 | */ |
| 3520 | natp = &softn->ipf_nat_table[1][hv1]; |
| 3521 | nat->nat_phnext[1] = natp; |
| 3522 | nat->nat_hnext[1] = *natp; |
| 3523 | if (*natp) |
| 3524 | (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; |
| 3525 | else { |
| 3526 | NBUMPSIDE(1, ns_inuse); |
| 3527 | } |
| 3528 | *natp = nat; |
| 3529 | NBUMPSIDE(1, ns_bucketlen[hv1]); |
| 3530 | |
| 3531 | ipf_nat_setqueue(softc, softn, nat); |
| 3532 | |
| 3533 | if (nat->nat_dir & NAT_OUTBOUND) { |
| 3534 | NBUMPSIDE(1, ns_added); |
| 3535 | } else { |
| 3536 | NBUMPSIDE(0, ns_added); |
| 3537 | } |
| 3538 | softn->ipf_nat_stats.ns_active++; |
| 3539 | return 0; |
| 3540 | } |
| 3541 | |
| 3542 | |
| 3543 | /* ------------------------------------------------------------------------ */ |
| 3544 | /* Function: ipf_nat_icmperrorlookup */ |
| 3545 | /* Returns: nat_t* - point to matching NAT structure */ |
| 3546 | /* Parameters: fin(I) - pointer to packet information */ |
| 3547 | /* dir(I) - direction of packet (in/out) */ |
| 3548 | /* */ |
| 3549 | /* Check if the ICMP error message is related to an existing TCP, UDP or */ |
| 3550 | /* ICMP query nat entry. It is assumed that the packet is already of the */ |
| 3551 | /* the required length. */ |
| 3552 | /* ------------------------------------------------------------------------ */ |
| 3553 | nat_t * |
| 3554 | ipf_nat_icmperrorlookup(fr_info_t *fin, int dir) |
| 3555 | { |
| 3556 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3557 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3558 | int flags = 0, minlen; |
| 3559 | icmphdr_t *orgicmp; |
| 3560 | nat_stat_side_t *nside; |
| 3561 | tcphdr_t *tcp = NULL; |
| 3562 | u_short data[2]; |
| 3563 | nat_t *nat; |
| 3564 | ip_t *oip; |
| 3565 | u_int p; |
| 3566 | |
| 3567 | nside = &softn->ipf_nat_stats.ns_side[fin->fin_out]; |
| 3568 | /* |
| 3569 | * Does it at least have the return (basic) IP header ? |
| 3570 | * Only a basic IP header (no options) should be with an ICMP error |
| 3571 | * header. Also, if it's not an error type, then return. |
| 3572 | */ |
| 3573 | if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) { |
| 3574 | ATOMIC_INCL(nside->ns_icmp_basic); |
| 3575 | return NULL; |
| 3576 | } |
| 3577 | |
| 3578 | /* |
| 3579 | * Check packet size |
| 3580 | */ |
| 3581 | oip = (ip_t *)((char *)fin->fin_dp + 8); |
| 3582 | minlen = IP_HL(oip) << 2; |
| 3583 | if ((minlen < sizeof(ip_t)) || |
| 3584 | (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) { |
| 3585 | ATOMIC_INCL(nside->ns_icmp_size); |
| 3586 | return NULL; |
| 3587 | } |
| 3588 | |
| 3589 | /* |
| 3590 | * Is the buffer big enough for all of it ? It's the size of the IP |
| 3591 | * header claimed in the encapsulated part which is of concern. It |
| 3592 | * may be too big to be in this buffer but not so big that it's |
| 3593 | * outside the ICMP packet, leading to TCP deref's causing problems. |
| 3594 | * This is possible because we don't know how big oip_hl is when we |
| 3595 | * do the pullup early in ipf_check() and thus can't gaurantee it is |
| 3596 | * all here now. |
| 3597 | */ |
| 3598 | #ifdef ipf_nat_KERNEL |
| 3599 | { |
| 3600 | mb_t *m; |
| 3601 | |
| 3602 | m = fin->fin_m; |
| 3603 | # if defined(MENTAT) |
| 3604 | if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > |
| 3605 | (char *)m->b_wptr) { |
| 3606 | ATOMIC_INCL(nside->ns_icmp_mbuf); |
| 3607 | return NULL; |
| 3608 | } |
| 3609 | # else |
| 3610 | if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > |
| 3611 | (char *)fin->fin_ip + M_LEN(m)) { |
| 3612 | ATOMIC_INCL(nside->ns_icmp_mbuf); |
| 3613 | return NULL; |
| 3614 | } |
| 3615 | # endif |
| 3616 | } |
| 3617 | #endif |
| 3618 | |
| 3619 | if (fin->fin_daddr != oip->ip_src.s_addr) { |
| 3620 | ATOMIC_INCL(nside->ns_icmp_address); |
| 3621 | return NULL; |
| 3622 | } |
| 3623 | |
| 3624 | p = oip->ip_p; |
| 3625 | if (p == IPPROTO_TCP) |
| 3626 | flags = IPN_TCP; |
| 3627 | else if (p == IPPROTO_UDP) |
| 3628 | flags = IPN_UDP; |
| 3629 | else if (p == IPPROTO_ICMP) { |
| 3630 | orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2)); |
| 3631 | |
| 3632 | /* see if this is related to an ICMP query */ |
| 3633 | if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) { |
| 3634 | data[0] = fin->fin_data[0]; |
| 3635 | data[1] = fin->fin_data[1]; |
| 3636 | fin->fin_data[0] = 0; |
| 3637 | fin->fin_data[1] = orgicmp->icmp_id; |
| 3638 | |
| 3639 | flags = IPN_ICMPERR|IPN_ICMPQUERY; |
| 3640 | /* |
| 3641 | * NOTE : dir refers to the direction of the original |
| 3642 | * ip packet. By definition the icmp error |
| 3643 | * message flows in the opposite direction. |
| 3644 | */ |
| 3645 | if (dir == NAT_INBOUND) |
| 3646 | nat = ipf_nat_inlookup(fin, flags, p, |
| 3647 | oip->ip_dst, |
| 3648 | oip->ip_src); |
| 3649 | else |
| 3650 | nat = ipf_nat_outlookup(fin, flags, p, |
| 3651 | oip->ip_dst, |
| 3652 | oip->ip_src); |
| 3653 | fin->fin_data[0] = data[0]; |
| 3654 | fin->fin_data[1] = data[1]; |
| 3655 | return nat; |
| 3656 | } |
| 3657 | } |
| 3658 | |
| 3659 | if (flags & IPN_TCPUDP) { |
| 3660 | minlen += 8; /* + 64bits of data to get ports */ |
| 3661 | /* TRACE (fin,minlen) */ |
| 3662 | if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) { |
| 3663 | ATOMIC_INCL(nside->ns_icmp_short); |
| 3664 | return NULL; |
| 3665 | } |
| 3666 | |
| 3667 | data[0] = fin->fin_data[0]; |
| 3668 | data[1] = fin->fin_data[1]; |
| 3669 | tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2)); |
| 3670 | fin->fin_data[0] = ntohs(tcp->th_dport); |
| 3671 | fin->fin_data[1] = ntohs(tcp->th_sport); |
| 3672 | |
| 3673 | if (dir == NAT_INBOUND) { |
| 3674 | nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst, |
| 3675 | oip->ip_src); |
| 3676 | } else { |
| 3677 | nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst, |
| 3678 | oip->ip_src); |
| 3679 | } |
| 3680 | fin->fin_data[0] = data[0]; |
| 3681 | fin->fin_data[1] = data[1]; |
| 3682 | return nat; |
| 3683 | } |
| 3684 | if (dir == NAT_INBOUND) |
| 3685 | nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src); |
| 3686 | else |
| 3687 | nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src); |
| 3688 | |
| 3689 | return nat; |
| 3690 | } |
| 3691 | |
| 3692 | |
| 3693 | /* ------------------------------------------------------------------------ */ |
| 3694 | /* Function: ipf_nat_icmperror */ |
| 3695 | /* Returns: nat_t* - point to matching NAT structure */ |
| 3696 | /* Parameters: fin(I) - pointer to packet information */ |
| 3697 | /* nflags(I) - NAT flags for this packet */ |
| 3698 | /* dir(I) - direction of packet (in/out) */ |
| 3699 | /* */ |
| 3700 | /* Fix up an ICMP packet which is an error message for an existing NAT */ |
| 3701 | /* session. This will correct both packet header data and checksums. */ |
| 3702 | /* */ |
| 3703 | /* This should *ONLY* be used for incoming ICMP error packets to make sure */ |
| 3704 | /* a NAT'd ICMP packet gets correctly recognised. */ |
| 3705 | /* ------------------------------------------------------------------------ */ |
| 3706 | nat_t * |
| 3707 | ipf_nat_icmperror(fr_info_t *fin, u_int *nflags, int dir) |
| 3708 | { |
| 3709 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3710 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3711 | u_32_t sum1, sum2, sumd, sumd2; |
| 3712 | struct in_addr a1, a2, a3, a4; |
| 3713 | int flags, dlen, odst; |
| 3714 | icmphdr_t *icmp; |
| 3715 | u_short *csump; |
| 3716 | tcphdr_t *tcp; |
| 3717 | nat_t *nat; |
| 3718 | ip_t *oip; |
| 3719 | void *dp; |
| 3720 | |
| 3721 | if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { |
| 3722 | NBUMPSIDED(fin->fin_out, ns_icmp_short); |
| 3723 | return NULL; |
| 3724 | } |
| 3725 | |
| 3726 | /* |
| 3727 | * ipf_nat_icmperrorlookup() will return NULL for `defective' packets. |
| 3728 | */ |
| 3729 | if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) { |
| 3730 | NBUMPSIDED(fin->fin_out, ns_icmp_notfound); |
| 3731 | return NULL; |
| 3732 | } |
| 3733 | |
| 3734 | tcp = NULL; |
| 3735 | csump = NULL; |
| 3736 | flags = 0; |
| 3737 | sumd2 = 0; |
| 3738 | *nflags = IPN_ICMPERR; |
| 3739 | icmp = fin->fin_dp; |
| 3740 | oip = (ip_t *)&icmp->icmp_ip; |
| 3741 | dp = (((char *)oip) + (IP_HL(oip) << 2)); |
| 3742 | if (oip->ip_p == IPPROTO_TCP) { |
| 3743 | tcp = (tcphdr_t *)dp; |
| 3744 | csump = (u_short *)&tcp->th_sum; |
| 3745 | flags = IPN_TCP; |
| 3746 | } else if (oip->ip_p == IPPROTO_UDP) { |
| 3747 | udphdr_t *udp; |
| 3748 | |
| 3749 | udp = (udphdr_t *)dp; |
| 3750 | tcp = (tcphdr_t *)dp; |
| 3751 | csump = (u_short *)&udp->uh_sum; |
| 3752 | flags = IPN_UDP; |
| 3753 | } else if (oip->ip_p == IPPROTO_ICMP) |
| 3754 | flags = IPN_ICMPQUERY; |
| 3755 | dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip); |
| 3756 | |
| 3757 | /* |
| 3758 | * Need to adjust ICMP header to include the real IP#'s and |
| 3759 | * port #'s. Only apply a checksum change relative to the |
| 3760 | * IP address change as it will be modified again in ipf_nat_checkout |
| 3761 | * for both address and port. Two checksum changes are |
| 3762 | * necessary for the two header address changes. Be careful |
| 3763 | * to only modify the checksum once for the port # and twice |
| 3764 | * for the IP#. |
| 3765 | */ |
| 3766 | |
| 3767 | /* |
| 3768 | * Step 1 |
| 3769 | * Fix the IP addresses in the offending IP packet. You also need |
| 3770 | * to adjust the IP header checksum of that offending IP packet. |
| 3771 | * |
| 3772 | * Normally, you would expect that the ICMP checksum of the |
| 3773 | * ICMP error message needs to be adjusted as well for the |
| 3774 | * IP address change in oip. |
| 3775 | * However, this is a NOP, because the ICMP checksum is |
| 3776 | * calculated over the complete ICMP packet, which includes the |
| 3777 | * changed oip IP addresses and oip->ip_sum. However, these |
| 3778 | * two changes cancel each other out (if the delta for |
| 3779 | * the IP address is x, then the delta for ip_sum is minus x), |
| 3780 | * so no change in the icmp_cksum is necessary. |
| 3781 | * |
| 3782 | * Inbound ICMP |
| 3783 | * ------------ |
| 3784 | * MAP rule, SRC=a,DST=b -> SRC=c,DST=b |
| 3785 | * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b) |
| 3786 | * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip |
| 3787 | *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip |
| 3788 | * |
| 3789 | * RDR rule, SRC=a,DST=b -> SRC=a,DST=c |
| 3790 | * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 3791 | * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip |
| 3792 | *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip |
| 3793 | * |
| 3794 | * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d |
| 3795 | * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d) |
| 3796 | * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip |
| 3797 | *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip |
| 3798 | * |
| 3799 | * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d |
| 3800 | * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 3801 | * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip |
| 3802 | *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip |
| 3803 | * |
| 3804 | * Outbound ICMP |
| 3805 | * ------------- |
| 3806 | * MAP rule, SRC=a,DST=b -> SRC=c,DST=b |
| 3807 | * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 3808 | * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip |
| 3809 | *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip |
| 3810 | * |
| 3811 | * RDR rule, SRC=a,DST=b -> SRC=a,DST=c |
| 3812 | * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c) |
| 3813 | * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip |
| 3814 | *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip |
| 3815 | * |
| 3816 | * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d |
| 3817 | * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d) |
| 3818 | * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip |
| 3819 | *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip |
| 3820 | * |
| 3821 | * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d |
| 3822 | * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a) |
| 3823 | * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip |
| 3824 | *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip |
| 3825 | */ |
| 3826 | |
| 3827 | if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) || |
| 3828 | ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) { |
| 3829 | a1.s_addr = ntohl(nat->nat_osrcaddr); |
| 3830 | a4.s_addr = ntohl(oip->ip_src.s_addr); |
| 3831 | a3.s_addr = ntohl(nat->nat_odstaddr); |
| 3832 | a2.s_addr = ntohl(oip->ip_dst.s_addr); |
| 3833 | oip->ip_src.s_addr = htonl(a1.s_addr); |
| 3834 | oip->ip_dst.s_addr = htonl(a3.s_addr); |
| 3835 | odst = 1; |
| 3836 | } else { |
| 3837 | a1.s_addr = ntohl(nat->nat_ndstaddr); |
| 3838 | a2.s_addr = ntohl(oip->ip_dst.s_addr); |
| 3839 | a3.s_addr = ntohl(nat->nat_nsrcaddr); |
| 3840 | a4.s_addr = ntohl(oip->ip_src.s_addr); |
| 3841 | oip->ip_dst.s_addr = htonl(a3.s_addr); |
| 3842 | oip->ip_src.s_addr = htonl(a1.s_addr); |
| 3843 | odst = 0; |
| 3844 | } |
| 3845 | sum1 = 0; |
| 3846 | sum2 = 0; |
| 3847 | sumd = 0; |
| 3848 | CALC_SUMD(a2.s_addr, a3.s_addr, sum1); |
| 3849 | CALC_SUMD(a4.s_addr, a1.s_addr, sum2); |
| 3850 | sumd = sum2 + sum1; |
| 3851 | if (sumd != 0) |
| 3852 | ipf_fix_datacksum(&oip->ip_sum, sumd); |
| 3853 | |
| 3854 | sumd2 = sumd; |
| 3855 | sum1 = 0; |
| 3856 | sum2 = 0; |
| 3857 | |
| 3858 | /* |
| 3859 | * Fix UDP pseudo header checksum to compensate for the |
| 3860 | * IP address change. |
| 3861 | */ |
| 3862 | if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) { |
| 3863 | u_32_t sum3, sum4, sumt; |
| 3864 | |
| 3865 | /* |
| 3866 | * Step 2 : |
| 3867 | * For offending TCP/UDP IP packets, translate the ports as |
| 3868 | * well, based on the NAT specification. Of course such |
| 3869 | * a change may be reflected in the ICMP checksum as well. |
| 3870 | * |
| 3871 | * Since the port fields are part of the TCP/UDP checksum |
| 3872 | * of the offending IP packet, you need to adjust that checksum |
| 3873 | * as well... except that the change in the port numbers should |
| 3874 | * be offset by the checksum change. However, the TCP/UDP |
| 3875 | * checksum will also need to change if there has been an |
| 3876 | * IP address change. |
| 3877 | */ |
| 3878 | if (odst == 1) { |
| 3879 | sum1 = ntohs(nat->nat_osport); |
| 3880 | sum4 = ntohs(tcp->th_sport); |
| 3881 | sum3 = ntohs(nat->nat_odport); |
| 3882 | sum2 = ntohs(tcp->th_dport); |
| 3883 | |
| 3884 | tcp->th_sport = htons(sum1); |
| 3885 | tcp->th_dport = htons(sum3); |
| 3886 | } else { |
| 3887 | sum1 = ntohs(nat->nat_ndport); |
| 3888 | sum2 = ntohs(tcp->th_dport); |
| 3889 | sum3 = ntohs(nat->nat_nsport); |
| 3890 | sum4 = ntohs(tcp->th_sport); |
| 3891 | |
| 3892 | tcp->th_dport = htons(sum3); |
| 3893 | tcp->th_sport = htons(sum1); |
| 3894 | } |
| 3895 | CALC_SUMD(sum4, sum1, sumt); |
| 3896 | sumd += sumt; |
| 3897 | CALC_SUMD(sum2, sum3, sumt); |
| 3898 | sumd += sumt; |
| 3899 | |
| 3900 | if (sumd != 0 || sumd2 != 0) { |
| 3901 | /* |
| 3902 | * At this point, sumd is the delta to apply to the |
| 3903 | * TCP/UDP header, given the changes in both the IP |
| 3904 | * address and the ports and sumd2 is the delta to |
| 3905 | * apply to the ICMP header, given the IP address |
| 3906 | * change delta that may need to be applied to the |
| 3907 | * TCP/UDP checksum instead. |
| 3908 | * |
| 3909 | * If we will both the IP and TCP/UDP checksums |
| 3910 | * then the ICMP checksum changes by the address |
| 3911 | * delta applied to the TCP/UDP checksum. If we |
| 3912 | * do not change the TCP/UDP checksum them we |
| 3913 | * apply the delta in ports to the ICMP checksum. |
| 3914 | */ |
| 3915 | if (oip->ip_p == IPPROTO_UDP) { |
| 3916 | if ((dlen >= 8) && (*csump != 0)) { |
| 3917 | ipf_fix_datacksum(csump, sumd); |
| 3918 | } else { |
| 3919 | CALC_SUMD(sum1, sum4, sumd2); |
| 3920 | CALC_SUMD(sum3, sum2, sumt); |
| 3921 | sumd2 += sumt; |
| 3922 | } |
| 3923 | } else if (oip->ip_p == IPPROTO_TCP) { |
| 3924 | if (dlen >= 18) { |
| 3925 | ipf_fix_datacksum(csump, sumd); |
| 3926 | } else { |
| 3927 | CALC_SUMD(sum1, sum4, sumd2); |
| 3928 | CALC_SUMD(sum3, sum2, sumt); |
| 3929 | sumd2 += sumt; |
| 3930 | } |
| 3931 | } |
| 3932 | if (sumd2 != 0) { |
| 3933 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 3934 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 3935 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 3936 | ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0); |
| 3937 | } |
| 3938 | } |
| 3939 | } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) { |
| 3940 | icmphdr_t *orgicmp; |
| 3941 | |
| 3942 | /* |
| 3943 | * XXX - what if this is bogus hl and we go off the end ? |
| 3944 | * In this case, ipf_nat_icmperrorlookup() will have |
| 3945 | * returned NULL. |
| 3946 | */ |
| 3947 | orgicmp = (icmphdr_t *)dp; |
| 3948 | |
| 3949 | if (odst == 1) { |
| 3950 | if (orgicmp->icmp_id != nat->nat_osport) { |
| 3951 | |
| 3952 | /* |
| 3953 | * Fix ICMP checksum (of the offening ICMP |
| 3954 | * query packet) to compensate the change |
| 3955 | * in the ICMP id of the offending ICMP |
| 3956 | * packet. |
| 3957 | * |
| 3958 | * Since you modify orgicmp->icmp_id with |
| 3959 | * a delta (say x) and you compensate that |
| 3960 | * in origicmp->icmp_cksum with a delta |
| 3961 | * minus x, you don't have to adjust the |
| 3962 | * overall icmp->icmp_cksum |
| 3963 | */ |
| 3964 | sum1 = ntohs(orgicmp->icmp_id); |
| 3965 | sum2 = ntohs(nat->nat_oicmpid); |
| 3966 | CALC_SUMD(sum1, sum2, sumd); |
| 3967 | orgicmp->icmp_id = nat->nat_oicmpid; |
| 3968 | ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd); |
| 3969 | } |
| 3970 | } /* nat_dir == NAT_INBOUND is impossible for icmp queries */ |
| 3971 | } |
| 3972 | return nat; |
| 3973 | } |
| 3974 | |
| 3975 | |
| 3976 | /* |
| 3977 | * MAP-IN MAP-OUT RDR-IN RDR-OUT |
| 3978 | * osrc X == src == src X |
| 3979 | * odst X == dst == dst X |
| 3980 | * nsrc == dst X X == dst |
| 3981 | * ndst == src X X == src |
| 3982 | * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND |
| 3983 | */ |
| 3984 | /* |
| 3985 | * NB: these lookups don't lock access to the list, it assumed that it has |
| 3986 | * already been done! |
| 3987 | */ |
| 3988 | /* ------------------------------------------------------------------------ */ |
| 3989 | /* Function: ipf_nat_inlookup */ |
| 3990 | /* Returns: nat_t* - NULL == no match, */ |
| 3991 | /* else pointer to matching NAT entry */ |
| 3992 | /* Parameters: fin(I) - pointer to packet information */ |
| 3993 | /* flags(I) - NAT flags for this packet */ |
| 3994 | /* p(I) - protocol for this packet */ |
| 3995 | /* src(I) - source IP address */ |
| 3996 | /* mapdst(I) - destination IP address */ |
| 3997 | /* */ |
| 3998 | /* Lookup a nat entry based on the mapped destination ip address/port and */ |
| 3999 | /* real source address/port. We use this lookup when receiving a packet, */ |
| 4000 | /* we're looking for a table entry, based on the destination address. */ |
| 4001 | /* */ |
| 4002 | /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ |
| 4003 | /* */ |
| 4004 | /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ |
| 4005 | /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ |
| 4006 | /* */ |
| 4007 | /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ |
| 4008 | /* the packet is of said protocol */ |
| 4009 | /* ------------------------------------------------------------------------ */ |
| 4010 | nat_t * |
| 4011 | ipf_nat_inlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, |
| 4012 | struct in_addr mapdst) |
| 4013 | { |
| 4014 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 4015 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 4016 | u_short sport, dport; |
| 4017 | ipnat_t *ipn; |
| 4018 | nat_t *nat; |
| 4019 | int nflags; |
| 4020 | u_32_t dst; |
| 4021 | void *ifp; |
| 4022 | u_int hv, rhv; |
| 4023 | |
| 4024 | ifp = fin->fin_ifp; |
| 4025 | dst = mapdst.s_addr; |
| 4026 | |
| 4027 | switch (p) |
| 4028 | { |
| 4029 | case IPPROTO_TCP : |
| 4030 | case IPPROTO_UDP : |
| 4031 | sport = htons(fin->fin_data[0]); |
| 4032 | dport = htons(fin->fin_data[1]); |
| 4033 | break; |
| 4034 | case IPPROTO_ICMP : |
| 4035 | sport = 0; |
| 4036 | dport = fin->fin_data[1]; |
| 4037 | break; |
| 4038 | default : |
| 4039 | sport = 0; |
| 4040 | dport = 0; |
| 4041 | break; |
| 4042 | } |
| 4043 | |
| 4044 | |
| 4045 | if ((flags & SI_WILDP) != 0) |
| 4046 | goto find_in_wild_ports; |
| 4047 | |
| 4048 | rhv = NAT_HASH_FN(dst, dport, 0xffffffff); |
| 4049 | rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff); |
| 4050 | hv = rhv % softn->ipf_nat_table_sz; |
| 4051 | nat = softn->ipf_nat_table[1][hv]; |
| 4052 | /* TRACE dst, dport, src, sport, hv, nat */ |
| 4053 | |
| 4054 | for (; nat; nat = nat->nat_hnext[1]) { |
| 4055 | if (nat->nat_ifps[0] != NULL) { |
| 4056 | if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) |
| 4057 | continue; |
| 4058 | } |
| 4059 | |
| 4060 | if (nat->nat_pr[0] != p) |
| 4061 | continue; |
| 4062 | |
| 4063 | switch (nat->nat_dir) |
| 4064 | { |
| 4065 | case NAT_INBOUND : |
| 4066 | case NAT_DIVERTIN : |
| 4067 | if (nat->nat_v[0] != 4) |
| 4068 | continue; |
| 4069 | if (nat->nat_osrcaddr != src.s_addr || |
| 4070 | nat->nat_odstaddr != dst) |
| 4071 | continue; |
| 4072 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 4073 | if (nat->nat_osport != sport) |
| 4074 | continue; |
| 4075 | if (nat->nat_odport != dport) |
| 4076 | continue; |
| 4077 | |
| 4078 | } else if (p == IPPROTO_ICMP) { |
| 4079 | if (nat->nat_oicmpid != dport) { |
| 4080 | continue; |
| 4081 | } |
| 4082 | } |
| 4083 | break; |
| 4084 | case NAT_DIVERTOUT : |
| 4085 | if (nat->nat_dlocal) |
| 4086 | continue; |
| 4087 | case NAT_OUTBOUND : |
| 4088 | if (nat->nat_v[1] != 4) |
| 4089 | continue; |
| 4090 | if (nat->nat_dlocal) |
| 4091 | continue; |
| 4092 | if (nat->nat_dlocal) |
| 4093 | continue; |
| 4094 | if (nat->nat_ndstaddr != src.s_addr || |
| 4095 | nat->nat_nsrcaddr != dst) |
| 4096 | continue; |
| 4097 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 4098 | if (nat->nat_ndport != sport) |
| 4099 | continue; |
| 4100 | if (nat->nat_nsport != dport) |
| 4101 | continue; |
| 4102 | |
| 4103 | } else if (p == IPPROTO_ICMP) { |
| 4104 | if (nat->nat_nicmpid != dport) { |
| 4105 | continue; |
| 4106 | } |
| 4107 | } |
| 4108 | break; |
| 4109 | } |
| 4110 | |
| 4111 | |
| 4112 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 4113 | ipn = nat->nat_ptr; |
| 4114 | if ((ipn != NULL) && (nat->nat_aps != NULL)) |
| 4115 | if (ipf_proxy_match(fin, nat) != 0) |
| 4116 | continue; |
| 4117 | } |
| 4118 | if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { |
| 4119 | nat->nat_ifps[0] = ifp; |
| 4120 | nat->nat_mtu[0] = GETIFMTU_4(ifp); |
| 4121 | } |
| 4122 | return nat; |
| 4123 | } |
| 4124 | |
| 4125 | /* |
| 4126 | * So if we didn't find it but there are wildcard members in the hash |
| 4127 | * table, go back and look for them. We do this search and update here |
| 4128 | * because it is modifying the NAT table and we want to do this only |
| 4129 | * for the first packet that matches. The exception, of course, is |
| 4130 | * for "dummy" (FI_IGNORE) lookups. |
| 4131 | */ |
| 4132 | find_in_wild_ports: |
| 4133 | if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { |
| 4134 | NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0); |
| 4135 | return NULL; |
| 4136 | } |
| 4137 | if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { |
| 4138 | NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0); |
| 4139 | return NULL; |
| 4140 | } |
| 4141 | |
| 4142 | RWLOCK_EXIT(&softc->ipf_nat); |
| 4143 | |
| 4144 | hv = NAT_HASH_FN(dst, 0, 0xffffffff); |
| 4145 | hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz); |
| 4146 | WRITE_ENTER(&softc->ipf_nat); |
| 4147 | |
| 4148 | nat = softn->ipf_nat_table[1][hv]; |
| 4149 | /* TRACE dst, src, hv, nat */ |
| 4150 | for (; nat; nat = nat->nat_hnext[1]) { |
| 4151 | if (nat->nat_ifps[0] != NULL) { |
| 4152 | if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) |
| 4153 | continue; |
| 4154 | } |
| 4155 | |
| 4156 | if (nat->nat_pr[0] != fin->fin_p) |
| 4157 | continue; |
| 4158 | |
| 4159 | switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) |
| 4160 | { |
| 4161 | case NAT_INBOUND : |
| 4162 | if (nat->nat_v[0] != 4) |
| 4163 | continue; |
| 4164 | if (nat->nat_osrcaddr != src.s_addr || |
| 4165 | nat->nat_odstaddr != dst) |
| 4166 | continue; |
| 4167 | break; |
| 4168 | case NAT_OUTBOUND : |
| 4169 | if (nat->nat_v[1] != 4) |
| 4170 | continue; |
| 4171 | if (nat->nat_ndstaddr != src.s_addr || |
| 4172 | nat->nat_nsrcaddr != dst) |
| 4173 | continue; |
| 4174 | break; |
| 4175 | } |
| 4176 | |
| 4177 | nflags = nat->nat_flags; |
| 4178 | if (!(nflags & (NAT_TCPUDP|SI_WILDP))) |
| 4179 | continue; |
| 4180 | |
| 4181 | if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags, |
| 4182 | NAT_INBOUND) == 1) { |
| 4183 | if ((fin->fin_flx & FI_IGNORE) != 0) |
| 4184 | break; |
| 4185 | if ((nflags & SI_CLONE) != 0) { |
| 4186 | nat = ipf_nat_clone(fin, nat); |
| 4187 | if (nat == NULL) |
| 4188 | break; |
| 4189 | } else { |
| 4190 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 4191 | softn->ipf_nat_stats.ns_wilds--; |
| 4192 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 4193 | } |
| 4194 | |
| 4195 | if (nat->nat_dir == NAT_INBOUND) { |
| 4196 | if (nat->nat_osport == 0) { |
| 4197 | nat->nat_osport = sport; |
| 4198 | nat->nat_nsport = sport; |
| 4199 | } |
| 4200 | if (nat->nat_odport == 0) { |
| 4201 | nat->nat_odport = dport; |
| 4202 | nat->nat_ndport = dport; |
| 4203 | } |
| 4204 | } else if (nat->nat_dir == NAT_OUTBOUND) { |
| 4205 | if (nat->nat_osport == 0) { |
| 4206 | nat->nat_osport = dport; |
| 4207 | nat->nat_nsport = dport; |
| 4208 | } |
| 4209 | if (nat->nat_odport == 0) { |
| 4210 | nat->nat_odport = sport; |
| 4211 | nat->nat_ndport = sport; |
| 4212 | } |
| 4213 | } |
| 4214 | if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { |
| 4215 | nat->nat_ifps[0] = ifp; |
| 4216 | nat->nat_mtu[0] = GETIFMTU_4(ifp); |
| 4217 | } |
| 4218 | nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); |
| 4219 | ipf_nat_tabmove(softn, nat); |
| 4220 | break; |
| 4221 | } |
| 4222 | } |
| 4223 | |
| 4224 | MUTEX_DOWNGRADE(&softc->ipf_nat); |
| 4225 | |
| 4226 | if (nat == NULL) { |
| 4227 | NBUMPSIDE(0, ns_lookup_miss); |
| 4228 | } |
| 4229 | return nat; |
| 4230 | } |
| 4231 | |
| 4232 | |
| 4233 | /* ------------------------------------------------------------------------ */ |
| 4234 | /* Function: ipf_nat_tabmove */ |
| 4235 | /* Returns: Nil */ |
| 4236 | /* Parameters: softn(I) - pointer to NAT context structure */ |
| 4237 | /* nat(I) - pointer to NAT structure */ |
| 4238 | /* Write Lock: ipf_nat */ |
| 4239 | /* */ |
| 4240 | /* This function is only called for TCP/UDP NAT table entries where the */ |
| 4241 | /* original was placed in the table without hashing on the ports and we now */ |
| 4242 | /* want to include hashing on port numbers. */ |
| 4243 | /* ------------------------------------------------------------------------ */ |
| 4244 | static void |
| 4245 | ipf_nat_tabmove(ipf_nat_softc_t *softn, nat_t *nat) |
| 4246 | { |
| 4247 | u_int hv0, hv1, rhv0, rhv1; |
| 4248 | natstat_t *nsp; |
| 4249 | nat_t **natp; |
| 4250 | |
| 4251 | if (nat->nat_flags & SI_CLONE) |
| 4252 | return; |
| 4253 | |
| 4254 | nsp = &softn->ipf_nat_stats; |
| 4255 | /* |
| 4256 | * Remove the NAT entry from the old location |
| 4257 | */ |
| 4258 | if (nat->nat_hnext[0]) |
| 4259 | nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; |
| 4260 | *nat->nat_phnext[0] = nat->nat_hnext[0]; |
| 4261 | hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 4262 | hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 4263 | |
| 4264 | ASSERT(nsp->ns_side[0].ns_bucketlen[hv0] > 0); |
| 4265 | nsp->ns_side[0].ns_bucketlen[hv0]--; |
| 4266 | |
| 4267 | if (nat->nat_hnext[1]) |
| 4268 | nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; |
| 4269 | *nat->nat_phnext[1] = nat->nat_hnext[1]; |
| 4270 | ASSERT(nsp->ns_side[1].ns_bucketlen[hv1] > 0); |
| 4271 | nsp->ns_side[1].ns_bucketlen[hv1]--; |
| 4272 | |
| 4273 | /* |
| 4274 | * Add into the NAT table in the new position |
| 4275 | */ |
| 4276 | rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff); |
| 4277 | rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport, |
| 4278 | 0xffffffff); |
| 4279 | rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff); |
| 4280 | rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport, |
| 4281 | 0xffffffff); |
| 4282 | |
| 4283 | if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { |
| 4284 | nat->nat_hv[0] = rhv0; |
| 4285 | nat->nat_hv[1] = rhv1; |
| 4286 | } else { |
| 4287 | nat->nat_hv[0] = rhv1; |
| 4288 | nat->nat_hv[1] = rhv0; |
| 4289 | } |
| 4290 | |
| 4291 | hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 4292 | hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 4293 | |
| 4294 | /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */ |
| 4295 | /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */ |
| 4296 | |
| 4297 | natp = &softn->ipf_nat_table[0][hv0]; |
| 4298 | if (*natp) |
| 4299 | (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; |
| 4300 | nat->nat_phnext[0] = natp; |
| 4301 | nat->nat_hnext[0] = *natp; |
| 4302 | *natp = nat; |
| 4303 | nsp->ns_side[0].ns_bucketlen[hv0]++; |
| 4304 | |
| 4305 | natp = &softn->ipf_nat_table[1][hv1]; |
| 4306 | if (*natp) |
| 4307 | (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; |
| 4308 | nat->nat_phnext[1] = natp; |
| 4309 | nat->nat_hnext[1] = *natp; |
| 4310 | *natp = nat; |
| 4311 | nsp->ns_side[1].ns_bucketlen[hv1]++; |
| 4312 | } |
| 4313 | |
| 4314 | |
| 4315 | /* ------------------------------------------------------------------------ */ |
| 4316 | /* Function: ipf_nat_outlookup */ |
| 4317 | /* Returns: nat_t* - NULL == no match, */ |
| 4318 | /* else pointer to matching NAT entry */ |
| 4319 | /* Parameters: fin(I) - pointer to packet information */ |
| 4320 | /* flags(I) - NAT flags for this packet */ |
| 4321 | /* p(I) - protocol for this packet */ |
| 4322 | /* src(I) - source IP address */ |
| 4323 | /* dst(I) - destination IP address */ |
| 4324 | /* rw(I) - 1 == write lock on held, 0 == read lock. */ |
| 4325 | /* */ |
| 4326 | /* Lookup a nat entry based on the source 'real' ip address/port and */ |
| 4327 | /* destination address/port. We use this lookup when sending a packet out, */ |
| 4328 | /* we're looking for a table entry, based on the source address. */ |
| 4329 | /* */ |
| 4330 | /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ |
| 4331 | /* */ |
| 4332 | /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ |
| 4333 | /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ |
| 4334 | /* */ |
| 4335 | /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ |
| 4336 | /* the packet is of said protocol */ |
| 4337 | /* ------------------------------------------------------------------------ */ |
| 4338 | nat_t * |
| 4339 | ipf_nat_outlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, |
| 4340 | struct in_addr dst) |
| 4341 | { |
| 4342 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 4343 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 4344 | u_short sport, dport; |
| 4345 | ipnat_t *ipn; |
| 4346 | nat_t *nat; |
| 4347 | void *ifp; |
| 4348 | u_int hv; |
| 4349 | |
| 4350 | ifp = fin->fin_ifp; |
| 4351 | |
| 4352 | switch (p) |
| 4353 | { |
| 4354 | case IPPROTO_TCP : |
| 4355 | case IPPROTO_UDP : |
| 4356 | sport = htons(fin->fin_data[0]); |
| 4357 | dport = htons(fin->fin_data[1]); |
| 4358 | break; |
| 4359 | case IPPROTO_ICMP : |
| 4360 | sport = 0; |
| 4361 | dport = fin->fin_data[1]; |
| 4362 | break; |
| 4363 | default : |
| 4364 | sport = 0; |
| 4365 | dport = 0; |
| 4366 | break; |
| 4367 | } |
| 4368 | |
| 4369 | if ((flags & SI_WILDP) != 0) |
| 4370 | goto find_out_wild_ports; |
| 4371 | |
| 4372 | hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff); |
| 4373 | hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz); |
| 4374 | nat = softn->ipf_nat_table[0][hv]; |
| 4375 | |
| 4376 | /* TRACE src, sport, dst, dport, hv, nat */ |
| 4377 | |
| 4378 | for (; nat; nat = nat->nat_hnext[0]) { |
| 4379 | if (nat->nat_ifps[1] != NULL) { |
| 4380 | if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) |
| 4381 | continue; |
| 4382 | } |
| 4383 | |
| 4384 | if (nat->nat_pr[1] != p) |
| 4385 | continue; |
| 4386 | |
| 4387 | switch (nat->nat_dir) |
| 4388 | { |
| 4389 | case NAT_INBOUND : |
| 4390 | case NAT_DIVERTIN : |
| 4391 | if (nat->nat_v[1] != 4) |
| 4392 | continue; |
| 4393 | if (nat->nat_ndstaddr != src.s_addr || |
| 4394 | nat->nat_nsrcaddr != dst.s_addr) |
| 4395 | continue; |
| 4396 | |
| 4397 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 4398 | if (nat->nat_ndport != sport) |
| 4399 | continue; |
| 4400 | if (nat->nat_nsport != dport) |
| 4401 | continue; |
| 4402 | |
| 4403 | } else if (p == IPPROTO_ICMP) { |
| 4404 | if (nat->nat_nicmpid != dport) { |
| 4405 | continue; |
| 4406 | } |
| 4407 | } |
| 4408 | break; |
| 4409 | case NAT_OUTBOUND : |
| 4410 | case NAT_DIVERTOUT : |
| 4411 | if (nat->nat_v[0] != 4) |
| 4412 | continue; |
| 4413 | if (nat->nat_osrcaddr != src.s_addr || |
| 4414 | nat->nat_odstaddr != dst.s_addr) |
| 4415 | continue; |
| 4416 | |
| 4417 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 4418 | if (nat->nat_odport != dport) |
| 4419 | continue; |
| 4420 | if (nat->nat_osport != sport) |
| 4421 | continue; |
| 4422 | |
| 4423 | } else if (p == IPPROTO_ICMP) { |
| 4424 | if (nat->nat_oicmpid != dport) { |
| 4425 | continue; |
| 4426 | } |
| 4427 | } |
| 4428 | break; |
| 4429 | } |
| 4430 | |
| 4431 | ipn = nat->nat_ptr; |
| 4432 | if ((ipn != NULL) && (nat->nat_aps != NULL)) |
| 4433 | if (ipf_proxy_match(fin, nat) != 0) |
| 4434 | continue; |
| 4435 | |
| 4436 | if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { |
| 4437 | nat->nat_ifps[1] = ifp; |
| 4438 | nat->nat_mtu[1] = GETIFMTU_4(ifp); |
| 4439 | } |
| 4440 | return nat; |
| 4441 | } |
| 4442 | |
| 4443 | /* |
| 4444 | * So if we didn't find it but there are wildcard members in the hash |
| 4445 | * table, go back and look for them. We do this search and update here |
| 4446 | * because it is modifying the NAT table and we want to do this only |
| 4447 | * for the first packet that matches. The exception, of course, is |
| 4448 | * for "dummy" (FI_IGNORE) lookups. |
| 4449 | */ |
| 4450 | find_out_wild_ports: |
| 4451 | if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { |
| 4452 | NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1); |
| 4453 | return NULL; |
| 4454 | } |
| 4455 | if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { |
| 4456 | NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1); |
| 4457 | return NULL; |
| 4458 | } |
| 4459 | |
| 4460 | RWLOCK_EXIT(&softc->ipf_nat); |
| 4461 | |
| 4462 | hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff); |
| 4463 | hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz); |
| 4464 | |
| 4465 | WRITE_ENTER(&softc->ipf_nat); |
| 4466 | |
| 4467 | nat = softn->ipf_nat_table[0][hv]; |
| 4468 | for (; nat; nat = nat->nat_hnext[0]) { |
| 4469 | if (nat->nat_ifps[1] != NULL) { |
| 4470 | if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) |
| 4471 | continue; |
| 4472 | } |
| 4473 | |
| 4474 | if (nat->nat_pr[1] != fin->fin_p) |
| 4475 | continue; |
| 4476 | |
| 4477 | switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) |
| 4478 | { |
| 4479 | case NAT_INBOUND : |
| 4480 | if (nat->nat_v[1] != 4) |
| 4481 | continue; |
| 4482 | if (nat->nat_ndstaddr != src.s_addr || |
| 4483 | nat->nat_nsrcaddr != dst.s_addr) |
| 4484 | continue; |
| 4485 | break; |
| 4486 | case NAT_OUTBOUND : |
| 4487 | if (nat->nat_v[0] != 4) |
| 4488 | continue; |
| 4489 | if (nat->nat_osrcaddr != src.s_addr || |
| 4490 | nat->nat_odstaddr != dst.s_addr) |
| 4491 | continue; |
| 4492 | break; |
| 4493 | } |
| 4494 | |
| 4495 | if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP))) |
| 4496 | continue; |
| 4497 | |
| 4498 | if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags, |
| 4499 | NAT_OUTBOUND) == 1) { |
| 4500 | if ((fin->fin_flx & FI_IGNORE) != 0) |
| 4501 | break; |
| 4502 | if ((nat->nat_flags & SI_CLONE) != 0) { |
| 4503 | nat = ipf_nat_clone(fin, nat); |
| 4504 | if (nat == NULL) |
| 4505 | break; |
| 4506 | } else { |
| 4507 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 4508 | softn->ipf_nat_stats.ns_wilds--; |
| 4509 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 4510 | } |
| 4511 | |
| 4512 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 4513 | if (nat->nat_osport == 0) { |
| 4514 | nat->nat_osport = sport; |
| 4515 | nat->nat_nsport = sport; |
| 4516 | } |
| 4517 | if (nat->nat_odport == 0) { |
| 4518 | nat->nat_odport = dport; |
| 4519 | nat->nat_ndport = dport; |
| 4520 | } |
| 4521 | } else if (nat->nat_dir == NAT_INBOUND) { |
| 4522 | if (nat->nat_osport == 0) { |
| 4523 | nat->nat_osport = dport; |
| 4524 | nat->nat_nsport = dport; |
| 4525 | } |
| 4526 | if (nat->nat_odport == 0) { |
| 4527 | nat->nat_odport = sport; |
| 4528 | nat->nat_ndport = sport; |
| 4529 | } |
| 4530 | } |
| 4531 | if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { |
| 4532 | nat->nat_ifps[1] = ifp; |
| 4533 | nat->nat_mtu[1] = GETIFMTU_4(ifp); |
| 4534 | } |
| 4535 | nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); |
| 4536 | ipf_nat_tabmove(softn, nat); |
| 4537 | break; |
| 4538 | } |
| 4539 | } |
| 4540 | |
| 4541 | MUTEX_DOWNGRADE(&softc->ipf_nat); |
| 4542 | |
| 4543 | if (nat == NULL) { |
| 4544 | NBUMPSIDE(1, ns_lookup_miss); |
| 4545 | } |
| 4546 | return nat; |
| 4547 | } |
| 4548 | |
| 4549 | |
| 4550 | /* ------------------------------------------------------------------------ */ |
| 4551 | /* Function: ipf_nat_lookupredir */ |
| 4552 | /* Returns: nat_t* - NULL == no match, */ |
| 4553 | /* else pointer to matching NAT entry */ |
| 4554 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 4555 | /* np(I) - pointer to description of packet to find NAT */ |
| 4556 | /* table entry for. */ |
| 4557 | /* */ |
| 4558 | /* Lookup the NAT tables to search for a matching redirect */ |
| 4559 | /* The contents of natlookup_t should imitate those found in a packet that */ |
| 4560 | /* would be translated - ie a packet coming in for RDR or going out for MAP.*/ |
| 4561 | /* We can do the lookup in one of two ways, imitating an inbound or */ |
| 4562 | /* outbound packet. By default we assume outbound, unless IPN_IN is set. */ |
| 4563 | /* For IN, the fields are set as follows: */ |
| 4564 | /* nl_real* = source information */ |
| 4565 | /* nl_out* = destination information (translated) */ |
| 4566 | /* For an out packet, the fields are set like this: */ |
| 4567 | /* nl_in* = source information (untranslated) */ |
| 4568 | /* nl_out* = destination information (translated) */ |
| 4569 | /* ------------------------------------------------------------------------ */ |
| 4570 | nat_t * |
| 4571 | ipf_nat_lookupredir(ipf_main_softc_t *softc, natlookup_t *np) |
| 4572 | { |
| 4573 | fr_info_t fi; |
| 4574 | nat_t *nat; |
| 4575 | |
| 4576 | bzero((char *)&fi, sizeof(fi)); |
| 4577 | fi.fin_main_soft = softc; |
| 4578 | if (np->nl_flags & IPN_IN) { |
| 4579 | fi.fin_data[0] = ntohs(np->nl_realport); |
| 4580 | fi.fin_data[1] = ntohs(np->nl_outport); |
| 4581 | } else { |
| 4582 | fi.fin_data[0] = ntohs(np->nl_inport); |
| 4583 | fi.fin_data[1] = ntohs(np->nl_outport); |
| 4584 | } |
| 4585 | if (np->nl_flags & IPN_TCP) |
| 4586 | fi.fin_p = IPPROTO_TCP; |
| 4587 | else if (np->nl_flags & IPN_UDP) |
| 4588 | fi.fin_p = IPPROTO_UDP; |
| 4589 | else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY)) |
| 4590 | fi.fin_p = IPPROTO_ICMP; |
| 4591 | |
| 4592 | /* |
| 4593 | * We can do two sorts of lookups: |
| 4594 | * - IPN_IN: we have the `real' and `out' address, look for `in'. |
| 4595 | * - default: we have the `in' and `out' address, look for `real'. |
| 4596 | */ |
| 4597 | if (np->nl_flags & IPN_IN) { |
| 4598 | if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p, |
| 4599 | np->nl_realip, np->nl_outip))) { |
| 4600 | np->nl_inip = nat->nat_odstip; |
| 4601 | np->nl_inport = nat->nat_odport; |
| 4602 | } |
| 4603 | } else { |
| 4604 | /* |
| 4605 | * If nl_inip is non null, this is a lookup based on the real |
| 4606 | * ip address. Else, we use the fake. |
| 4607 | */ |
| 4608 | if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p, |
| 4609 | np->nl_inip, np->nl_outip))) { |
| 4610 | |
| 4611 | if ((np->nl_flags & IPN_FINDFORWARD) != 0) { |
| 4612 | fr_info_t fin; |
| 4613 | bzero((char *)&fin, sizeof(fin)); |
| 4614 | fin.fin_p = nat->nat_pr[0]; |
| 4615 | fin.fin_data[0] = ntohs(nat->nat_ndport); |
| 4616 | fin.fin_data[1] = ntohs(nat->nat_nsport); |
| 4617 | if (ipf_nat_inlookup(&fin, np->nl_flags, |
| 4618 | fin.fin_p, nat->nat_ndstip, |
| 4619 | nat->nat_nsrcip) != NULL) { |
| 4620 | np->nl_flags &= ~IPN_FINDFORWARD; |
| 4621 | } |
| 4622 | } |
| 4623 | |
| 4624 | np->nl_realip = nat->nat_odstip; |
| 4625 | np->nl_realport = nat->nat_odport; |
| 4626 | } |
| 4627 | } |
| 4628 | |
| 4629 | return nat; |
| 4630 | } |
| 4631 | |
| 4632 | |
| 4633 | /* ------------------------------------------------------------------------ */ |
| 4634 | /* Function: ipf_nat_match */ |
| 4635 | /* Returns: int - 0 == no match, 1 == match */ |
| 4636 | /* Parameters: fin(I) - pointer to packet information */ |
| 4637 | /* np(I) - pointer to NAT rule */ |
| 4638 | /* */ |
| 4639 | /* Pull the matching of a packet against a NAT rule out of that complex */ |
| 4640 | /* loop inside ipf_nat_checkin() and lay it out properly in its own function. */ |
| 4641 | /* ------------------------------------------------------------------------ */ |
| 4642 | static int |
| 4643 | ipf_nat_match(fr_info_t *fin, ipnat_t *np) |
| 4644 | { |
| 4645 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 4646 | frtuc_t *ft; |
| 4647 | int match; |
| 4648 | |
| 4649 | match = 0; |
| 4650 | switch (np->in_osrcatype) |
| 4651 | { |
| 4652 | case FRI_NORMAL : |
| 4653 | match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr); |
| 4654 | break; |
| 4655 | case FRI_LOOKUP : |
| 4656 | match = (*np->in_osrcfunc)(softc, np->in_osrcptr, |
| 4657 | 4, &fin->fin_saddr, fin->fin_plen); |
| 4658 | break; |
| 4659 | } |
| 4660 | match ^= ((np->in_flags & IPN_NOTSRC) != 0); |
| 4661 | if (match) |
| 4662 | return 0; |
| 4663 | |
| 4664 | match = 0; |
| 4665 | switch (np->in_odstatype) |
| 4666 | { |
| 4667 | case FRI_NORMAL : |
| 4668 | match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr); |
| 4669 | break; |
| 4670 | case FRI_LOOKUP : |
| 4671 | match = (*np->in_odstfunc)(softc, np->in_odstptr, |
| 4672 | 4, &fin->fin_daddr, fin->fin_plen); |
| 4673 | break; |
| 4674 | } |
| 4675 | |
| 4676 | match ^= ((np->in_flags & IPN_NOTDST) != 0); |
| 4677 | if (match) |
| 4678 | return 0; |
| 4679 | |
| 4680 | ft = &np->in_tuc; |
| 4681 | if (!(fin->fin_flx & FI_TCPUDP) || |
| 4682 | (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { |
| 4683 | if (ft->ftu_scmp || ft->ftu_dcmp) |
| 4684 | return 0; |
| 4685 | return 1; |
| 4686 | } |
| 4687 | |
| 4688 | return ipf_tcpudpchk(&fin->fin_fi, ft); |
| 4689 | } |
| 4690 | |
| 4691 | |
| 4692 | /* ------------------------------------------------------------------------ */ |
| 4693 | /* Function: ipf_nat_update */ |
| 4694 | /* Returns: Nil */ |
| 4695 | /* Parameters: fin(I) - pointer to packet information */ |
| 4696 | /* nat(I) - pointer to NAT structure */ |
| 4697 | /* */ |
| 4698 | /* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */ |
| 4699 | /* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */ |
| 4700 | /* */ |
| 4701 | /* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */ |
| 4702 | /* already be set. */ |
| 4703 | /* ------------------------------------------------------------------------ */ |
| 4704 | void |
| 4705 | ipf_nat_update(fr_info_t *fin, nat_t *nat) |
| 4706 | { |
| 4707 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 4708 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 4709 | ipftq_t *ifq, *ifq2; |
| 4710 | ipftqent_t *tqe; |
| 4711 | ipnat_t *np = nat->nat_ptr; |
| 4712 | |
| 4713 | tqe = &nat->nat_tqe; |
| 4714 | ifq = tqe->tqe_ifq; |
| 4715 | |
| 4716 | /* |
| 4717 | * We allow over-riding of NAT timeouts from NAT rules, even for |
| 4718 | * TCP, however, if it is TCP and there is no rule timeout set, |
| 4719 | * then do not update the timeout here. |
| 4720 | */ |
| 4721 | if (np != NULL) { |
| 4722 | np->in_bytes[fin->fin_rev] += fin->fin_plen; |
| 4723 | ifq2 = np->in_tqehead[fin->fin_rev]; |
| 4724 | } else { |
| 4725 | ifq2 = NULL; |
| 4726 | } |
| 4727 | |
| 4728 | if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) { |
| 4729 | (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq, |
| 4730 | 0, 2); |
| 4731 | } else { |
| 4732 | if (ifq2 == NULL) { |
| 4733 | if (nat->nat_pr[0] == IPPROTO_UDP) |
| 4734 | ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq : |
| 4735 | &softn->ipf_nat_udptq; |
| 4736 | else if (nat->nat_pr[0] == IPPROTO_ICMP || |
| 4737 | nat->nat_pr[0] == IPPROTO_ICMPV6) |
| 4738 | ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq: |
| 4739 | &softn->ipf_nat_icmptq; |
| 4740 | else |
| 4741 | ifq2 = &softn->ipf_nat_iptq; |
| 4742 | } |
| 4743 | |
| 4744 | ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2); |
| 4745 | } |
| 4746 | } |
| 4747 | |
| 4748 | |
| 4749 | /* ------------------------------------------------------------------------ */ |
| 4750 | /* Function: ipf_nat_checkout */ |
| 4751 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 4752 | /* 0 == no packet translation occurred, */ |
| 4753 | /* 1 == packet was successfully translated. */ |
| 4754 | /* Parameters: fin(I) - pointer to packet information */ |
| 4755 | /* passp(I) - pointer to filtering result flags */ |
| 4756 | /* */ |
| 4757 | /* Check to see if an outcoming packet should be changed. ICMP packets are */ |
| 4758 | /* first checked to see if they match an existing entry (if an error), */ |
| 4759 | /* otherwise a search of the current NAT table is made. If neither results */ |
| 4760 | /* in a match then a search for a matching NAT rule is made. Create a new */ |
| 4761 | /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ |
| 4762 | /* packet header(s) as required. */ |
| 4763 | /* ------------------------------------------------------------------------ */ |
| 4764 | int |
| 4765 | ipf_nat_checkout(fr_info_t *fin, u_32_t *passp) |
| 4766 | { |
| 4767 | ipnat_t *np = NULL, *npnext; |
| 4768 | struct ifnet *ifp, *sifp; |
| 4769 | ipf_main_softc_t *softc; |
| 4770 | ipf_nat_softc_t *softn; |
| 4771 | tcphdr_t *tcp = NULL; |
| 4772 | int rval, natfailed; |
| 4773 | u_int nflags = 0; |
| 4774 | u_32_t ipa, iph; |
| 4775 | int natadd = 1; |
| 4776 | frentry_t *fr; |
| 4777 | nat_t *nat; |
| 4778 | |
| 4779 | if (fin->fin_v == 6) { |
| 4780 | #ifdef USE_INET6 |
| 4781 | return ipf_nat6_checkout(fin, passp); |
| 4782 | #else |
| 4783 | return 0; |
| 4784 | #endif |
| 4785 | } |
| 4786 | |
| 4787 | softc = fin->fin_main_soft; |
| 4788 | softn = softc->ipf_nat_soft; |
| 4789 | |
| 4790 | if (softn->ipf_nat_lock != 0) |
| 4791 | return 0; |
| 4792 | if (softn->ipf_nat_stats.ns_rules == 0 && |
| 4793 | softn->ipf_nat_instances == NULL) |
| 4794 | return 0; |
| 4795 | |
| 4796 | natfailed = 0; |
| 4797 | fr = fin->fin_fr; |
| 4798 | sifp = fin->fin_ifp; |
| 4799 | if (fr != NULL) { |
| 4800 | ifp = fr->fr_tifs[fin->fin_rev].fd_ptr; |
| 4801 | if ((ifp != NULL) && (ifp != (void *)-1)) |
| 4802 | fin->fin_ifp = ifp; |
| 4803 | } |
| 4804 | ifp = fin->fin_ifp; |
| 4805 | |
| 4806 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 4807 | switch (fin->fin_p) |
| 4808 | { |
| 4809 | case IPPROTO_TCP : |
| 4810 | nflags = IPN_TCP; |
| 4811 | break; |
| 4812 | case IPPROTO_UDP : |
| 4813 | nflags = IPN_UDP; |
| 4814 | break; |
| 4815 | case IPPROTO_ICMP : |
| 4816 | /* |
| 4817 | * This is an incoming packet, so the destination is |
| 4818 | * the icmp_id and the source port equals 0 |
| 4819 | */ |
| 4820 | if ((fin->fin_flx & FI_ICMPQUERY) != 0) |
| 4821 | nflags = IPN_ICMPQUERY; |
| 4822 | break; |
| 4823 | default : |
| 4824 | break; |
| 4825 | } |
| 4826 | |
| 4827 | if ((nflags & IPN_TCPUDP)) |
| 4828 | tcp = fin->fin_dp; |
| 4829 | } |
| 4830 | |
| 4831 | ipa = fin->fin_saddr; |
| 4832 | |
| 4833 | READ_ENTER(&softc->ipf_nat); |
| 4834 | |
| 4835 | if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && |
| 4836 | (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND))) |
| 4837 | /*EMPTY*/; |
| 4838 | else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) |
| 4839 | natadd = 0; |
| 4840 | else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH, |
| 4841 | (u_int)fin->fin_p, fin->fin_src, |
| 4842 | fin->fin_dst))) { |
| 4843 | nflags = nat->nat_flags; |
| 4844 | } else if (fin->fin_off == 0) { |
| 4845 | u_32_t hv, msk, nmsk = 0; |
| 4846 | |
| 4847 | /* |
| 4848 | * If there is no current entry in the nat table for this IP#, |
| 4849 | * create one for it (if there is a matching rule). |
| 4850 | */ |
| 4851 | maskloop: |
| 4852 | msk = softn->ipf_nat_map_active_masks[nmsk]; |
| 4853 | iph = ipa & msk; |
| 4854 | hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz); |
| 4855 | retry_roundrobin: |
| 4856 | for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) { |
| 4857 | npnext = np->in_mnext; |
| 4858 | if ((np->in_ifps[1] && (np->in_ifps[1] != ifp))) |
| 4859 | continue; |
| 4860 | if (np->in_v[0] != 4) |
| 4861 | continue; |
| 4862 | if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p)) |
| 4863 | continue; |
| 4864 | if ((np->in_flags & IPN_RF) && |
| 4865 | !(np->in_flags & nflags)) |
| 4866 | continue; |
| 4867 | if (np->in_flags & IPN_FILTER) { |
| 4868 | switch (ipf_nat_match(fin, np)) |
| 4869 | { |
| 4870 | case 0 : |
| 4871 | continue; |
| 4872 | case -1 : |
| 4873 | rval = -1; |
| 4874 | goto outmatchfail; |
| 4875 | case 1 : |
| 4876 | default : |
| 4877 | break; |
| 4878 | } |
| 4879 | } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr) |
| 4880 | continue; |
| 4881 | |
| 4882 | if ((fr != NULL) && |
| 4883 | !ipf_matchtag(&np->in_tag, &fr->fr_nattag)) |
| 4884 | continue; |
| 4885 | |
| 4886 | if (np->in_plabel != -1) { |
| 4887 | if (((np->in_flags & IPN_FILTER) == 0) && |
| 4888 | (np->in_odport != fin->fin_data[1])) |
| 4889 | continue; |
| 4890 | if (ipf_proxy_ok(fin, tcp, np) == 0) |
| 4891 | continue; |
| 4892 | } |
| 4893 | |
| 4894 | if (np->in_flags & IPN_NO) { |
| 4895 | np->in_hits++; |
| 4896 | break; |
| 4897 | } |
| 4898 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 4899 | /* |
| 4900 | * If we've matched a round-robin rule but it has |
| 4901 | * moved in the list since we got it, start over as |
| 4902 | * this is now no longer correct. |
| 4903 | */ |
| 4904 | if (npnext != np->in_mnext) { |
| 4905 | if ((np->in_flags & IPN_ROUNDR) != 0) { |
| 4906 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 4907 | goto retry_roundrobin; |
| 4908 | } |
| 4909 | npnext = np->in_mnext; |
| 4910 | } |
| 4911 | |
| 4912 | nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND); |
| 4913 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 4914 | if (nat != NULL) { |
| 4915 | natfailed = 0; |
| 4916 | break; |
| 4917 | } |
| 4918 | natfailed = -1; |
| 4919 | } |
| 4920 | if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) { |
| 4921 | nmsk++; |
| 4922 | goto maskloop; |
| 4923 | } |
| 4924 | } |
| 4925 | |
| 4926 | if (nat != NULL) { |
| 4927 | rval = ipf_nat_out(fin, nat, natadd, nflags); |
| 4928 | if (rval == 1) { |
| 4929 | MUTEX_ENTER(&nat->nat_lock); |
| 4930 | ipf_nat_update(fin, nat); |
| 4931 | nat->nat_bytes[1] += fin->fin_plen; |
| 4932 | nat->nat_pkts[1]++; |
| 4933 | fin->fin_pktnum = nat->nat_pkts[1]; |
| 4934 | MUTEX_EXIT(&nat->nat_lock); |
| 4935 | } |
| 4936 | } else |
| 4937 | rval = natfailed; |
| 4938 | outmatchfail: |
| 4939 | RWLOCK_EXIT(&softc->ipf_nat); |
| 4940 | |
| 4941 | switch (rval) |
| 4942 | { |
| 4943 | case -1 : |
| 4944 | if (passp != NULL) { |
| 4945 | DT1(frb_natv4out, fr_info_t *, fin); |
| 4946 | NBUMPSIDED(1, ns_drop); |
| 4947 | *passp = FR_BLOCK; |
| 4948 | fin->fin_reason = FRB_NATV4; |
| 4949 | } |
| 4950 | fin->fin_flx |= FI_BADNAT; |
| 4951 | NBUMPSIDED(1, ns_badnat); |
| 4952 | break; |
| 4953 | case 0 : |
| 4954 | NBUMPSIDE(1, ns_ignored); |
| 4955 | break; |
| 4956 | case 1 : |
| 4957 | NBUMPSIDE(1, ns_translated); |
| 4958 | break; |
| 4959 | } |
| 4960 | fin->fin_ifp = sifp; |
| 4961 | return rval; |
| 4962 | } |
| 4963 | |
| 4964 | /* ------------------------------------------------------------------------ */ |
| 4965 | /* Function: ipf_nat_out */ |
| 4966 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 4967 | /* 1 == packet was successfully translated. */ |
| 4968 | /* Parameters: fin(I) - pointer to packet information */ |
| 4969 | /* nat(I) - pointer to NAT structure */ |
| 4970 | /* natadd(I) - flag indicating if it is safe to add frag cache */ |
| 4971 | /* nflags(I) - NAT flags set for this packet */ |
| 4972 | /* */ |
| 4973 | /* Translate a packet coming "out" on an interface. */ |
| 4974 | /* ------------------------------------------------------------------------ */ |
| 4975 | int |
| 4976 | ipf_nat_out(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) |
| 4977 | { |
| 4978 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 4979 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 4980 | icmphdr_t *icmp; |
| 4981 | tcphdr_t *tcp; |
| 4982 | ipnat_t *np; |
| 4983 | int skip; |
| 4984 | int i; |
| 4985 | |
| 4986 | tcp = NULL; |
| 4987 | icmp = NULL; |
| 4988 | np = nat->nat_ptr; |
| 4989 | |
| 4990 | if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL)) |
| 4991 | (void) ipf_frag_natnew(softc, fin, 0, nat); |
| 4992 | |
| 4993 | /* |
| 4994 | * Fix up checksums, not by recalculating them, but |
| 4995 | * simply computing adjustments. |
| 4996 | * This is only done for STREAMS based IP implementations where the |
| 4997 | * checksum has already been calculated by IP. In all other cases, |
| 4998 | * IPFilter is called before the checksum needs calculating so there |
| 4999 | * is no call to modify whatever is in the header now. |
| 5000 | */ |
| 5001 | if (nflags == IPN_ICMPERR) { |
| 5002 | u_32_t s1, s2, sumd, msumd; |
| 5003 | |
| 5004 | s1 = LONG_SUM(ntohl(fin->fin_saddr)); |
| 5005 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 5006 | s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); |
| 5007 | } else { |
| 5008 | s2 = LONG_SUM(ntohl(nat->nat_odstaddr)); |
| 5009 | } |
| 5010 | CALC_SUMD(s1, s2, sumd); |
| 5011 | msumd = sumd; |
| 5012 | |
| 5013 | s1 = LONG_SUM(ntohl(fin->fin_daddr)); |
| 5014 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 5015 | s2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); |
| 5016 | } else { |
| 5017 | s2 = LONG_SUM(ntohl(nat->nat_osrcaddr)); |
| 5018 | } |
| 5019 | CALC_SUMD(s1, s2, sumd); |
| 5020 | msumd += sumd; |
| 5021 | |
| 5022 | ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0); |
| 5023 | } |
| 5024 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 5025 | defined(linux) || defined(BRIDGE_IPF) |
| 5026 | else { |
| 5027 | /* |
| 5028 | * Strictly speaking, this isn't necessary on BSD |
| 5029 | * kernels because they do checksum calculation after |
| 5030 | * this code has run BUT if ipfilter is being used |
| 5031 | * to do NAT as a bridge, that code doesn't exist. |
| 5032 | */ |
| 5033 | switch (nat->nat_dir) |
| 5034 | { |
| 5035 | case NAT_OUTBOUND : |
| 5036 | ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART, |
| 5037 | &fin->fin_ip->ip_sum, |
| 5038 | nat->nat_ipsumd, 0); |
| 5039 | break; |
| 5040 | |
| 5041 | case NAT_INBOUND : |
| 5042 | ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART, |
| 5043 | &fin->fin_ip->ip_sum, |
| 5044 | nat->nat_ipsumd, 0); |
| 5045 | break; |
| 5046 | |
| 5047 | default : |
| 5048 | break; |
| 5049 | } |
| 5050 | } |
| 5051 | #endif |
| 5052 | |
| 5053 | /* |
| 5054 | * Address assignment is after the checksum modification because |
| 5055 | * we are using the address in the packet for determining the |
| 5056 | * correct checksum offset (the ICMP error could be coming from |
| 5057 | * anyone...) |
| 5058 | */ |
| 5059 | switch (nat->nat_dir) |
| 5060 | { |
| 5061 | case NAT_OUTBOUND : |
| 5062 | fin->fin_ip->ip_src = nat->nat_nsrcip; |
| 5063 | fin->fin_saddr = nat->nat_nsrcaddr; |
| 5064 | fin->fin_ip->ip_dst = nat->nat_ndstip; |
| 5065 | fin->fin_daddr = nat->nat_ndstaddr; |
| 5066 | break; |
| 5067 | |
| 5068 | case NAT_INBOUND : |
| 5069 | fin->fin_ip->ip_src = nat->nat_odstip; |
| 5070 | fin->fin_saddr = nat->nat_ndstaddr; |
| 5071 | fin->fin_ip->ip_dst = nat->nat_osrcip; |
| 5072 | fin->fin_daddr = nat->nat_nsrcaddr; |
| 5073 | break; |
| 5074 | |
| 5075 | case NAT_DIVERTIN : |
| 5076 | { |
| 5077 | mb_t *m; |
| 5078 | |
| 5079 | skip = ipf_nat_decap(fin, nat); |
| 5080 | if (skip <= 0) { |
| 5081 | NBUMPSIDED(1, ns_decap_fail); |
| 5082 | return -1; |
| 5083 | } |
| 5084 | |
| 5085 | m = fin->fin_m; |
| 5086 | |
| 5087 | #if defined(MENTAT) && defined(_KERNEL) |
| 5088 | m->b_rptr += skip; |
| 5089 | #else |
| 5090 | m->m_data += skip; |
| 5091 | m->m_len -= skip; |
| 5092 | |
| 5093 | # ifdef M_PKTHDR |
| 5094 | if (m->m_flags & M_PKTHDR) |
| 5095 | m->m_pkthdr.len -= skip; |
| 5096 | # endif |
| 5097 | #endif |
| 5098 | |
| 5099 | MUTEX_ENTER(&nat->nat_lock); |
| 5100 | ipf_nat_update(fin, nat); |
| 5101 | MUTEX_EXIT(&nat->nat_lock); |
| 5102 | fin->fin_flx |= FI_NATED; |
| 5103 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 5104 | fin->fin_nattag = &np->in_tag; |
| 5105 | return 1; |
| 5106 | /* NOTREACHED */ |
| 5107 | } |
| 5108 | |
| 5109 | case NAT_DIVERTOUT : |
| 5110 | { |
| 5111 | u_32_t s1, s2, sumd; |
| 5112 | udphdr_t *uh; |
| 5113 | ip_t *ip; |
| 5114 | mb_t *m; |
| 5115 | |
| 5116 | m = M_DUP(np->in_divmp); |
| 5117 | if (m == NULL) { |
| 5118 | NBUMPSIDED(1, ns_divert_dup); |
| 5119 | return -1; |
| 5120 | } |
| 5121 | |
| 5122 | ip = MTOD(m, ip_t *); |
| 5123 | ip->ip_id = htons(ipf_nextipid(fin)); |
| 5124 | s2 = ntohs(ip->ip_id); |
| 5125 | |
| 5126 | s1 = ip->ip_len; |
| 5127 | ip->ip_len = ntohs(ip->ip_len); |
| 5128 | ip->ip_len += fin->fin_plen; |
| 5129 | ip->ip_len = htons(ip->ip_len); |
| 5130 | s2 += ntohs(ip->ip_len); |
| 5131 | CALC_SUMD(s1, s2, sumd); |
| 5132 | |
| 5133 | uh = (udphdr_t *)(ip + 1); |
| 5134 | uh->uh_ulen += fin->fin_plen; |
| 5135 | uh->uh_ulen = htons(uh->uh_ulen); |
| 5136 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 5137 | defined(linux) || defined(BRIDGE_IPF) |
| 5138 | ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); |
| 5139 | #endif |
| 5140 | |
| 5141 | PREP_MB_T(fin, m); |
| 5142 | |
| 5143 | fin->fin_src = ip->ip_src; |
| 5144 | fin->fin_dst = ip->ip_dst; |
| 5145 | fin->fin_ip = ip; |
| 5146 | fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ |
| 5147 | fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ |
| 5148 | |
| 5149 | nflags &= ~IPN_TCPUDPICMP; |
| 5150 | |
| 5151 | break; |
| 5152 | } |
| 5153 | |
| 5154 | default : |
| 5155 | break; |
| 5156 | } |
| 5157 | |
| 5158 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 5159 | u_short *csump; |
| 5160 | |
| 5161 | if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) { |
| 5162 | tcp = fin->fin_dp; |
| 5163 | |
| 5164 | switch (nat->nat_dir) |
| 5165 | { |
| 5166 | case NAT_OUTBOUND : |
| 5167 | tcp->th_sport = nat->nat_nsport; |
| 5168 | fin->fin_data[0] = ntohs(nat->nat_nsport); |
| 5169 | tcp->th_dport = nat->nat_ndport; |
| 5170 | fin->fin_data[1] = ntohs(nat->nat_ndport); |
| 5171 | break; |
| 5172 | |
| 5173 | case NAT_INBOUND : |
| 5174 | tcp->th_sport = nat->nat_odport; |
| 5175 | fin->fin_data[0] = ntohs(nat->nat_odport); |
| 5176 | tcp->th_dport = nat->nat_osport; |
| 5177 | fin->fin_data[1] = ntohs(nat->nat_osport); |
| 5178 | break; |
| 5179 | } |
| 5180 | } |
| 5181 | |
| 5182 | if ((nat->nat_oicmpid != 0) && (nflags & IPN_ICMPQUERY)) { |
| 5183 | icmp = fin->fin_dp; |
| 5184 | |
| 5185 | switch (nat->nat_dir) |
| 5186 | { |
| 5187 | case NAT_OUTBOUND : |
| 5188 | icmp->icmp_id = nat->nat_nicmpid; |
| 5189 | break; |
| 5190 | case NAT_INBOUND : |
| 5191 | icmp->icmp_id = nat->nat_oicmpid; |
| 5192 | break; |
| 5193 | } |
| 5194 | } |
| 5195 | |
| 5196 | csump = ipf_nat_proto(fin, nat, nflags); |
| 5197 | |
| 5198 | /* |
| 5199 | * The above comments do not hold for layer 4 (or higher) |
| 5200 | * checksums... |
| 5201 | */ |
| 5202 | if (csump != NULL) { |
| 5203 | if (nat->nat_dir == NAT_OUTBOUND) |
| 5204 | ipf_fix_outcksum(fin->fin_cksum, csump, |
| 5205 | nat->nat_sumd[0], |
| 5206 | nat->nat_sumd[1] + |
| 5207 | fin->fin_dlen); |
| 5208 | else |
| 5209 | ipf_fix_incksum(fin->fin_cksum, csump, |
| 5210 | nat->nat_sumd[0], |
| 5211 | nat->nat_sumd[1] + |
| 5212 | fin->fin_dlen); |
| 5213 | } |
| 5214 | } |
| 5215 | |
| 5216 | ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); |
| 5217 | /* ------------------------------------------------------------- */ |
| 5218 | /* A few quick notes: */ |
| 5219 | /* Following are test conditions prior to calling the */ |
| 5220 | /* ipf_proxy_check routine. */ |
| 5221 | /* */ |
| 5222 | /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ |
| 5223 | /* with a redirect rule, we attempt to match the packet's */ |
| 5224 | /* source port against in_dport, otherwise we'd compare the */ |
| 5225 | /* packet's destination. */ |
| 5226 | /* ------------------------------------------------------------- */ |
| 5227 | if ((np != NULL) && (np->in_apr != NULL)) { |
| 5228 | i = ipf_proxy_check(fin, nat); |
| 5229 | if (i == 0) { |
| 5230 | i = 1; |
| 5231 | } else if (i == -1) { |
| 5232 | NBUMPSIDED(1, ns_ipf_proxy_fail); |
| 5233 | } |
| 5234 | } else { |
| 5235 | i = 1; |
| 5236 | } |
| 5237 | fin->fin_flx |= FI_NATED; |
| 5238 | return i; |
| 5239 | } |
| 5240 | |
| 5241 | |
| 5242 | /* ------------------------------------------------------------------------ */ |
| 5243 | /* Function: ipf_nat_checkin */ |
| 5244 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 5245 | /* 0 == no packet translation occurred, */ |
| 5246 | /* 1 == packet was successfully translated. */ |
| 5247 | /* Parameters: fin(I) - pointer to packet information */ |
| 5248 | /* passp(I) - pointer to filtering result flags */ |
| 5249 | /* */ |
| 5250 | /* Check to see if an incoming packet should be changed. ICMP packets are */ |
| 5251 | /* first checked to see if they match an existing entry (if an error), */ |
| 5252 | /* otherwise a search of the current NAT table is made. If neither results */ |
| 5253 | /* in a match then a search for a matching NAT rule is made. Create a new */ |
| 5254 | /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ |
| 5255 | /* packet header(s) as required. */ |
| 5256 | /* ------------------------------------------------------------------------ */ |
| 5257 | int |
| 5258 | ipf_nat_checkin(fr_info_t *fin, u_32_t *passp) |
| 5259 | { |
| 5260 | ipf_main_softc_t *softc; |
| 5261 | ipf_nat_softc_t *softn; |
| 5262 | u_int nflags, natadd; |
| 5263 | ipnat_t *np, *npnext; |
| 5264 | int rval, natfailed; |
| 5265 | struct ifnet *ifp; |
| 5266 | struct in_addr in; |
| 5267 | icmphdr_t *icmp; |
| 5268 | tcphdr_t *tcp; |
| 5269 | u_short dport; |
| 5270 | nat_t *nat; |
| 5271 | u_32_t iph; |
| 5272 | |
| 5273 | softc = fin->fin_main_soft; |
| 5274 | softn = softc->ipf_nat_soft; |
| 5275 | |
| 5276 | if (softn->ipf_nat_lock != 0) |
| 5277 | return 0; |
| 5278 | if (softn->ipf_nat_stats.ns_rules == 0 && |
| 5279 | softn->ipf_nat_instances == NULL) |
| 5280 | return 0; |
| 5281 | |
| 5282 | tcp = NULL; |
| 5283 | icmp = NULL; |
| 5284 | dport = 0; |
| 5285 | natadd = 1; |
| 5286 | nflags = 0; |
| 5287 | natfailed = 0; |
| 5288 | ifp = fin->fin_ifp; |
| 5289 | |
| 5290 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 5291 | switch (fin->fin_p) |
| 5292 | { |
| 5293 | case IPPROTO_TCP : |
| 5294 | nflags = IPN_TCP; |
| 5295 | break; |
| 5296 | case IPPROTO_UDP : |
| 5297 | nflags = IPN_UDP; |
| 5298 | break; |
| 5299 | case IPPROTO_ICMP : |
| 5300 | icmp = fin->fin_dp; |
| 5301 | |
| 5302 | /* |
| 5303 | * This is an incoming packet, so the destination is |
| 5304 | * the icmp_id and the source port equals 0 |
| 5305 | */ |
| 5306 | if ((fin->fin_flx & FI_ICMPQUERY) != 0) { |
| 5307 | nflags = IPN_ICMPQUERY; |
| 5308 | dport = icmp->icmp_id; |
| 5309 | } break; |
| 5310 | default : |
| 5311 | break; |
| 5312 | } |
| 5313 | |
| 5314 | if ((nflags & IPN_TCPUDP)) { |
| 5315 | tcp = fin->fin_dp; |
| 5316 | dport = fin->fin_data[1]; |
| 5317 | } |
| 5318 | } |
| 5319 | |
| 5320 | in = fin->fin_dst; |
| 5321 | |
| 5322 | READ_ENTER(&softc->ipf_nat); |
| 5323 | |
| 5324 | if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && |
| 5325 | (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND))) |
| 5326 | /*EMPTY*/; |
| 5327 | else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) |
| 5328 | natadd = 0; |
| 5329 | else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH, |
| 5330 | (u_int)fin->fin_p, |
| 5331 | fin->fin_src, in))) { |
| 5332 | nflags = nat->nat_flags; |
| 5333 | } else if (fin->fin_off == 0) { |
| 5334 | u_32_t hv, msk, rmsk = 0; |
| 5335 | |
| 5336 | /* |
| 5337 | * If there is no current entry in the nat table for this IP#, |
| 5338 | * create one for it (if there is a matching rule). |
| 5339 | */ |
| 5340 | maskloop: |
| 5341 | msk = softn->ipf_nat_rdr_active_masks[rmsk]; |
| 5342 | iph = in.s_addr & msk; |
| 5343 | hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz); |
| 5344 | retry_roundrobin: |
| 5345 | /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */ |
| 5346 | for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) { |
| 5347 | npnext = np->in_rnext; |
| 5348 | if (np->in_ifps[0] && (np->in_ifps[0] != ifp)) |
| 5349 | continue; |
| 5350 | if (np->in_v[0] != 4) |
| 5351 | continue; |
| 5352 | if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p)) |
| 5353 | continue; |
| 5354 | if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags)) |
| 5355 | continue; |
| 5356 | if (np->in_flags & IPN_FILTER) { |
| 5357 | switch (ipf_nat_match(fin, np)) |
| 5358 | { |
| 5359 | case 0 : |
| 5360 | continue; |
| 5361 | case -1 : |
| 5362 | rval = -1; |
| 5363 | goto inmatchfail; |
| 5364 | case 1 : |
| 5365 | default : |
| 5366 | break; |
| 5367 | } |
| 5368 | } else { |
| 5369 | if ((in.s_addr & np->in_odstmsk) != |
| 5370 | np->in_odstaddr) |
| 5371 | continue; |
| 5372 | if (np->in_odport && |
| 5373 | ((np->in_dtop < dport) || |
| 5374 | (dport < np->in_odport))) |
| 5375 | continue; |
| 5376 | } |
| 5377 | |
| 5378 | if (np->in_plabel != -1) { |
| 5379 | if (!ipf_proxy_ok(fin, tcp, np)) { |
| 5380 | continue; |
| 5381 | } |
| 5382 | } |
| 5383 | |
| 5384 | if (np->in_flags & IPN_NO) { |
| 5385 | np->in_hits++; |
| 5386 | break; |
| 5387 | } |
| 5388 | |
| 5389 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 5390 | /* |
| 5391 | * If we've matched a round-robin rule but it has |
| 5392 | * moved in the list since we got it, start over as |
| 5393 | * this is now no longer correct. |
| 5394 | */ |
| 5395 | if (npnext != np->in_rnext) { |
| 5396 | if ((np->in_flags & IPN_ROUNDR) != 0) { |
| 5397 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 5398 | goto retry_roundrobin; |
| 5399 | } |
| 5400 | npnext = np->in_rnext; |
| 5401 | } |
| 5402 | |
| 5403 | nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND); |
| 5404 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 5405 | if (nat != NULL) { |
| 5406 | natfailed = 0; |
| 5407 | break; |
| 5408 | } |
| 5409 | natfailed = -1; |
| 5410 | } |
| 5411 | if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) { |
| 5412 | rmsk++; |
| 5413 | goto maskloop; |
| 5414 | } |
| 5415 | } |
| 5416 | |
| 5417 | if (nat != NULL) { |
| 5418 | rval = ipf_nat_in(fin, nat, natadd, nflags); |
| 5419 | if (rval == 1) { |
| 5420 | MUTEX_ENTER(&nat->nat_lock); |
| 5421 | ipf_nat_update(fin, nat); |
| 5422 | nat->nat_bytes[0] += fin->fin_plen; |
| 5423 | nat->nat_pkts[0]++; |
| 5424 | fin->fin_pktnum = nat->nat_pkts[0]; |
| 5425 | MUTEX_EXIT(&nat->nat_lock); |
| 5426 | } |
| 5427 | } else |
| 5428 | rval = natfailed; |
| 5429 | inmatchfail: |
| 5430 | RWLOCK_EXIT(&softc->ipf_nat); |
| 5431 | |
| 5432 | switch (rval) |
| 5433 | { |
| 5434 | case -1 : |
| 5435 | if (passp != NULL) { |
| 5436 | DT1(frb_natv4in, fr_info_t *, fin); |
| 5437 | NBUMPSIDED(0, ns_drop); |
| 5438 | *passp = FR_BLOCK; |
| 5439 | fin->fin_reason = FRB_NATV4; |
| 5440 | } |
| 5441 | fin->fin_flx |= FI_BADNAT; |
| 5442 | NBUMPSIDED(0, ns_badnat); |
| 5443 | break; |
| 5444 | case 0 : |
| 5445 | NBUMPSIDE(0, ns_ignored); |
| 5446 | break; |
| 5447 | case 1 : |
| 5448 | NBUMPSIDE(0, ns_translated); |
| 5449 | break; |
| 5450 | } |
| 5451 | return rval; |
| 5452 | } |
| 5453 | |
| 5454 | |
| 5455 | /* ------------------------------------------------------------------------ */ |
| 5456 | /* Function: ipf_nat_in */ |
| 5457 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 5458 | /* 1 == packet was successfully translated. */ |
| 5459 | /* Parameters: fin(I) - pointer to packet information */ |
| 5460 | /* nat(I) - pointer to NAT structure */ |
| 5461 | /* natadd(I) - flag indicating if it is safe to add frag cache */ |
| 5462 | /* nflags(I) - NAT flags set for this packet */ |
| 5463 | /* Locks Held: ipf_nat(READ) */ |
| 5464 | /* */ |
| 5465 | /* Translate a packet coming "in" on an interface. */ |
| 5466 | /* ------------------------------------------------------------------------ */ |
| 5467 | int |
| 5468 | ipf_nat_in(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) |
| 5469 | { |
| 5470 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 5471 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 5472 | u_32_t sumd, ipsumd, sum1, sum2; |
| 5473 | icmphdr_t *icmp; |
| 5474 | tcphdr_t *tcp; |
| 5475 | ipnat_t *np; |
| 5476 | int skip; |
| 5477 | int i; |
| 5478 | |
| 5479 | tcp = NULL; |
| 5480 | np = nat->nat_ptr; |
| 5481 | fin->fin_fr = nat->nat_fr; |
| 5482 | |
| 5483 | if (np != NULL) { |
| 5484 | if ((natadd != 0) && (fin->fin_flx & FI_FRAG)) |
| 5485 | (void) ipf_frag_natnew(softc, fin, 0, nat); |
| 5486 | |
| 5487 | /* ------------------------------------------------------------- */ |
| 5488 | /* A few quick notes: */ |
| 5489 | /* Following are test conditions prior to calling the */ |
| 5490 | /* ipf_proxy_check routine. */ |
| 5491 | /* */ |
| 5492 | /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ |
| 5493 | /* with a map rule, we attempt to match the packet's */ |
| 5494 | /* source port against in_dport, otherwise we'd compare the */ |
| 5495 | /* packet's destination. */ |
| 5496 | /* ------------------------------------------------------------- */ |
| 5497 | if (np->in_apr != NULL) { |
| 5498 | i = ipf_proxy_check(fin, nat); |
| 5499 | if (i == -1) { |
| 5500 | NBUMPSIDED(0, ns_ipf_proxy_fail); |
| 5501 | return -1; |
| 5502 | } |
| 5503 | } |
| 5504 | } |
| 5505 | |
| 5506 | ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); |
| 5507 | |
| 5508 | ipsumd = nat->nat_ipsumd; |
| 5509 | /* |
| 5510 | * Fix up checksums, not by recalculating them, but |
| 5511 | * simply computing adjustments. |
| 5512 | * Why only do this for some platforms on inbound packets ? |
| 5513 | * Because for those that it is done, IP processing is yet to happen |
| 5514 | * and so the IPv4 header checksum has not yet been evaluated. |
| 5515 | * Perhaps it should always be done for the benefit of things like |
| 5516 | * fast forwarding (so that it doesn't need to be recomputed) but with |
| 5517 | * header checksum offloading, perhaps it is a moot point. |
| 5518 | */ |
| 5519 | |
| 5520 | switch (nat->nat_dir) |
| 5521 | { |
| 5522 | case NAT_INBOUND : |
| 5523 | if ((fin->fin_flx & FI_ICMPERR) == 0) { |
| 5524 | fin->fin_ip->ip_src = nat->nat_nsrcip; |
| 5525 | fin->fin_saddr = nat->nat_nsrcaddr; |
| 5526 | } else { |
| 5527 | sum1 = nat->nat_osrcaddr; |
| 5528 | sum2 = nat->nat_nsrcaddr; |
| 5529 | CALC_SUMD(sum1, sum2, sumd); |
| 5530 | ipsumd -= sumd; |
| 5531 | } |
| 5532 | fin->fin_ip->ip_dst = nat->nat_ndstip; |
| 5533 | fin->fin_daddr = nat->nat_ndstaddr; |
| 5534 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 5535 | defined(__osf__) || defined(linux) |
| 5536 | ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); |
| 5537 | #endif |
| 5538 | break; |
| 5539 | |
| 5540 | case NAT_OUTBOUND : |
| 5541 | if ((fin->fin_flx & FI_ICMPERR) == 0) { |
| 5542 | fin->fin_ip->ip_src = nat->nat_odstip; |
| 5543 | fin->fin_saddr = nat->nat_odstaddr; |
| 5544 | } else { |
| 5545 | sum1 = nat->nat_odstaddr; |
| 5546 | sum2 = nat->nat_ndstaddr; |
| 5547 | CALC_SUMD(sum1, sum2, sumd); |
| 5548 | ipsumd -= sumd; |
| 5549 | } |
| 5550 | fin->fin_ip->ip_dst = nat->nat_osrcip; |
| 5551 | fin->fin_daddr = nat->nat_osrcaddr; |
| 5552 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 5553 | defined(__osf__) || defined(linux) |
| 5554 | ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); |
| 5555 | #endif |
| 5556 | break; |
| 5557 | |
| 5558 | case NAT_DIVERTIN : |
| 5559 | { |
| 5560 | udphdr_t *uh; |
| 5561 | ip_t *ip; |
| 5562 | mb_t *m; |
| 5563 | |
| 5564 | m = M_DUP(np->in_divmp); |
| 5565 | if (m == NULL) { |
| 5566 | NBUMPSIDED(0, ns_divert_dup); |
| 5567 | return -1; |
| 5568 | } |
| 5569 | |
| 5570 | ip = MTOD(m, ip_t *); |
| 5571 | ip->ip_id = htons(ipf_nextipid(fin)); |
| 5572 | sum1 = ntohs(ip->ip_len); |
| 5573 | ip->ip_len = ntohs(ip->ip_len); |
| 5574 | ip->ip_len += fin->fin_plen; |
| 5575 | ip->ip_len = htons(ip->ip_len); |
| 5576 | |
| 5577 | uh = (udphdr_t *)(ip + 1); |
| 5578 | uh->uh_ulen += fin->fin_plen; |
| 5579 | uh->uh_ulen = htons(uh->uh_ulen); |
| 5580 | |
| 5581 | sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len); |
| 5582 | sum2 += ntohs(ip->ip_off) & IP_DF; |
| 5583 | CALC_SUMD(sum1, sum2, sumd); |
| 5584 | |
| 5585 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 5586 | defined(__osf__) || defined(linux) |
| 5587 | ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); |
| 5588 | #endif |
| 5589 | PREP_MB_T(fin, m); |
| 5590 | |
| 5591 | fin->fin_ip = ip; |
| 5592 | fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */ |
| 5593 | fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */ |
| 5594 | |
| 5595 | nflags &= ~IPN_TCPUDPICMP; |
| 5596 | |
| 5597 | break; |
| 5598 | } |
| 5599 | |
| 5600 | case NAT_DIVERTOUT : |
| 5601 | { |
| 5602 | mb_t *m; |
| 5603 | |
| 5604 | skip = ipf_nat_decap(fin, nat); |
| 5605 | if (skip <= 0) { |
| 5606 | NBUMPSIDED(0, ns_decap_fail); |
| 5607 | return -1; |
| 5608 | } |
| 5609 | |
| 5610 | m = fin->fin_m; |
| 5611 | |
| 5612 | #if defined(MENTAT) && defined(_KERNEL) |
| 5613 | m->b_rptr += skip; |
| 5614 | #else |
| 5615 | m->m_data += skip; |
| 5616 | m->m_len -= skip; |
| 5617 | |
| 5618 | # ifdef M_PKTHDR |
| 5619 | if (m->m_flags & M_PKTHDR) |
| 5620 | m->m_pkthdr.len -= skip; |
| 5621 | # endif |
| 5622 | #endif |
| 5623 | |
| 5624 | ipf_nat_update(fin, nat); |
| 5625 | nflags &= ~IPN_TCPUDPICMP; |
| 5626 | fin->fin_flx |= FI_NATED; |
| 5627 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 5628 | fin->fin_nattag = &np->in_tag; |
| 5629 | return 1; |
| 5630 | /* NOTREACHED */ |
| 5631 | } |
| 5632 | } |
| 5633 | if (nflags & IPN_TCPUDP) |
| 5634 | tcp = fin->fin_dp; |
| 5635 | |
| 5636 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 5637 | u_short *csump; |
| 5638 | |
| 5639 | if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) { |
| 5640 | switch (nat->nat_dir) |
| 5641 | { |
| 5642 | case NAT_INBOUND : |
| 5643 | tcp->th_sport = nat->nat_nsport; |
| 5644 | fin->fin_data[0] = ntohs(nat->nat_nsport); |
| 5645 | tcp->th_dport = nat->nat_ndport; |
| 5646 | fin->fin_data[1] = ntohs(nat->nat_ndport); |
| 5647 | break; |
| 5648 | |
| 5649 | case NAT_OUTBOUND : |
| 5650 | tcp->th_sport = nat->nat_odport; |
| 5651 | fin->fin_data[0] = ntohs(nat->nat_odport); |
| 5652 | tcp->th_dport = nat->nat_osport; |
| 5653 | fin->fin_data[1] = ntohs(nat->nat_osport); |
| 5654 | break; |
| 5655 | } |
| 5656 | } |
| 5657 | |
| 5658 | |
| 5659 | if ((nat->nat_oicmpid != 0) && (nflags & IPN_ICMPQUERY)) { |
| 5660 | icmp = fin->fin_dp; |
| 5661 | |
| 5662 | switch (nat->nat_dir) |
| 5663 | { |
| 5664 | case NAT_INBOUND : |
| 5665 | icmp->icmp_id = nat->nat_nicmpid; |
| 5666 | break; |
| 5667 | case NAT_OUTBOUND : |
| 5668 | icmp->icmp_id = nat->nat_oicmpid; |
| 5669 | break; |
| 5670 | } |
| 5671 | } |
| 5672 | |
| 5673 | csump = ipf_nat_proto(fin, nat, nflags); |
| 5674 | |
| 5675 | /* |
| 5676 | * The above comments do not hold for layer 4 (or higher) |
| 5677 | * checksums... |
| 5678 | */ |
| 5679 | if (csump != NULL) { |
| 5680 | if (nat->nat_dir == NAT_OUTBOUND) |
| 5681 | ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0); |
| 5682 | else |
| 5683 | ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0); |
| 5684 | } |
| 5685 | } |
| 5686 | |
| 5687 | fin->fin_flx |= FI_NATED; |
| 5688 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 5689 | fin->fin_nattag = &np->in_tag; |
| 5690 | return 1; |
| 5691 | } |
| 5692 | |
| 5693 | |
| 5694 | /* ------------------------------------------------------------------------ */ |
| 5695 | /* Function: ipf_nat_proto */ |
| 5696 | /* Returns: u_short* - pointer to transport header checksum to update, */ |
| 5697 | /* NULL if the transport protocol is not recognised */ |
| 5698 | /* as needing a checksum update. */ |
| 5699 | /* Parameters: fin(I) - pointer to packet information */ |
| 5700 | /* nat(I) - pointer to NAT structure */ |
| 5701 | /* nflags(I) - NAT flags set for this packet */ |
| 5702 | /* */ |
| 5703 | /* Return the pointer to the checksum field for each protocol so understood.*/ |
| 5704 | /* If support for making other changes to a protocol header is required, */ |
| 5705 | /* that is not strictly 'address' translation, such as clamping the MSS in */ |
| 5706 | /* TCP down to a specific value, then do it from here. */ |
| 5707 | /* ------------------------------------------------------------------------ */ |
| 5708 | u_short * |
| 5709 | ipf_nat_proto(fr_info_t *fin, nat_t *nat, u_int nflags) |
| 5710 | { |
| 5711 | icmphdr_t *icmp; |
| 5712 | u_short *csump; |
| 5713 | tcphdr_t *tcp; |
| 5714 | udphdr_t *udp; |
| 5715 | |
| 5716 | csump = NULL; |
| 5717 | if (fin->fin_out == 0) { |
| 5718 | fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND); |
| 5719 | } else { |
| 5720 | fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0); |
| 5721 | } |
| 5722 | |
| 5723 | switch (fin->fin_p) |
| 5724 | { |
| 5725 | case IPPROTO_TCP : |
| 5726 | tcp = fin->fin_dp; |
| 5727 | |
| 5728 | if ((nflags & IPN_TCP) != 0) |
| 5729 | csump = &tcp->th_sum; |
| 5730 | |
| 5731 | /* |
| 5732 | * Do a MSS CLAMPING on a SYN packet, |
| 5733 | * only deal IPv4 for now. |
| 5734 | */ |
| 5735 | if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0) |
| 5736 | ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump); |
| 5737 | |
| 5738 | break; |
| 5739 | |
| 5740 | case IPPROTO_UDP : |
| 5741 | udp = fin->fin_dp; |
| 5742 | |
| 5743 | if ((nflags & IPN_UDP) != 0) { |
| 5744 | if (udp->uh_sum != 0) |
| 5745 | csump = &udp->uh_sum; |
| 5746 | } |
| 5747 | break; |
| 5748 | |
| 5749 | case IPPROTO_ICMP : |
| 5750 | icmp = fin->fin_dp; |
| 5751 | |
| 5752 | if ((nflags & IPN_ICMPQUERY) != 0) { |
| 5753 | if (icmp->icmp_cksum != 0) |
| 5754 | csump = &icmp->icmp_cksum; |
| 5755 | } |
| 5756 | break; |
| 5757 | |
| 5758 | #ifdef USE_INET6 |
| 5759 | case IPPROTO_ICMPV6 : |
| 5760 | { |
| 5761 | struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp; |
| 5762 | |
| 5763 | icmp6 = fin->fin_dp; |
| 5764 | |
| 5765 | if ((nflags & IPN_ICMPQUERY) != 0) { |
| 5766 | if (icmp6->icmp6_cksum != 0) |
| 5767 | csump = &icmp6->icmp6_cksum; |
| 5768 | } |
| 5769 | break; |
| 5770 | } |
| 5771 | #endif |
| 5772 | } |
| 5773 | return csump; |
| 5774 | } |
| 5775 | |
| 5776 | |
| 5777 | /* ------------------------------------------------------------------------ */ |
| 5778 | /* Function: ipf_nat_expire */ |
| 5779 | /* Returns: Nil */ |
| 5780 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 5781 | /* */ |
| 5782 | /* Check all of the timeout queues for entries at the top which need to be */ |
| 5783 | /* expired. */ |
| 5784 | /* ------------------------------------------------------------------------ */ |
| 5785 | void |
| 5786 | ipf_nat_expire(ipf_main_softc_t *softc) |
| 5787 | { |
| 5788 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 5789 | ipftq_t *ifq, *ifqnext; |
| 5790 | ipftqent_t *tqe, *tqn; |
| 5791 | int i; |
| 5792 | SPL_INT(s); |
| 5793 | |
| 5794 | SPL_NET(s); |
| 5795 | WRITE_ENTER(&softc->ipf_nat); |
| 5796 | for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL; |
| 5797 | ifq = ifq->ifq_next) { |
| 5798 | for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { |
| 5799 | if (tqe->tqe_die > softc->ipf_ticks) |
| 5800 | break; |
| 5801 | tqn = tqe->tqe_next; |
| 5802 | ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); |
| 5803 | } |
| 5804 | } |
| 5805 | |
| 5806 | for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) { |
| 5807 | for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { |
| 5808 | if (tqe->tqe_die > softc->ipf_ticks) |
| 5809 | break; |
| 5810 | tqn = tqe->tqe_next; |
| 5811 | ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); |
| 5812 | } |
| 5813 | } |
| 5814 | |
| 5815 | for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { |
| 5816 | ifqnext = ifq->ifq_next; |
| 5817 | |
| 5818 | if (((ifq->ifq_flags & IFQF_DELETE) != 0) && |
| 5819 | (ifq->ifq_ref == 0)) { |
| 5820 | ipf_freetimeoutqueue(softc, ifq); |
| 5821 | } |
| 5822 | } |
| 5823 | |
| 5824 | if (softn->ipf_nat_doflush != 0) { |
| 5825 | ipf_nat_extraflush(softc, softn, 2); |
| 5826 | softn->ipf_nat_doflush = 0; |
| 5827 | } |
| 5828 | |
| 5829 | RWLOCK_EXIT(&softc->ipf_nat); |
| 5830 | SPL_X(s); |
| 5831 | } |
| 5832 | |
| 5833 | |
| 5834 | /* ------------------------------------------------------------------------ */ |
| 5835 | /* Function: ipf_nat_sync */ |
| 5836 | /* Returns: Nil */ |
| 5837 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 5838 | /* ifp(I) - pointer to network interface */ |
| 5839 | /* */ |
| 5840 | /* Walk through all of the currently active NAT sessions, looking for those */ |
| 5841 | /* which need to have their translated address updated. */ |
| 5842 | /* ------------------------------------------------------------------------ */ |
| 5843 | void |
| 5844 | ipf_nat_sync(ipf_main_softc_t *softc, void *ifp) |
| 5845 | { |
| 5846 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 5847 | u_32_t sum1, sum2, sumd; |
| 5848 | i6addr_t in; |
| 5849 | ipnat_t *n; |
| 5850 | nat_t *nat; |
| 5851 | void *ifp2; |
| 5852 | int idx; |
| 5853 | SPL_INT(s); |
| 5854 | |
| 5855 | if (softc->ipf_running <= 0) |
| 5856 | return; |
| 5857 | |
| 5858 | /* |
| 5859 | * Change IP addresses for NAT sessions for any protocol except TCP |
| 5860 | * since it will break the TCP connection anyway. The only rules |
| 5861 | * which will get changed are those which are "map ... -> 0/32", |
| 5862 | * where the rule specifies the address is taken from the interface. |
| 5863 | */ |
| 5864 | SPL_NET(s); |
| 5865 | WRITE_ENTER(&softc->ipf_nat); |
| 5866 | |
| 5867 | if (softc->ipf_running <= 0) { |
| 5868 | RWLOCK_EXIT(&softc->ipf_nat); |
| 5869 | return; |
| 5870 | } |
| 5871 | |
| 5872 | for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) { |
| 5873 | if ((nat->nat_flags & IPN_TCP) != 0) |
| 5874 | continue; |
| 5875 | |
| 5876 | n = nat->nat_ptr; |
| 5877 | if (n != NULL) { |
| 5878 | if (n->in_v[1] == 4) { |
| 5879 | if (n->in_redir & NAT_MAP) { |
| 5880 | if ((n->in_nsrcaddr != 0) || |
| 5881 | (n->in_nsrcmsk != 0xffffffff)) |
| 5882 | continue; |
| 5883 | } else if (n->in_redir & NAT_REDIRECT) { |
| 5884 | if ((n->in_ndstaddr != 0) || |
| 5885 | (n->in_ndstmsk != 0xffffffff)) |
| 5886 | continue; |
| 5887 | } |
| 5888 | } |
| 5889 | #ifdef USE_INET6 |
| 5890 | if (n->in_v[1] == 4) { |
| 5891 | if (n->in_redir & NAT_MAP) { |
| 5892 | if (!IP6_ISZERO(&n->in_nsrcaddr) || |
| 5893 | !IP6_ISONES(&n->in_nsrcmsk)) |
| 5894 | continue; |
| 5895 | } else if (n->in_redir & NAT_REDIRECT) { |
| 5896 | if (!IP6_ISZERO(&n->in_ndstaddr) || |
| 5897 | !IP6_ISONES(&n->in_ndstmsk)) |
| 5898 | continue; |
| 5899 | } |
| 5900 | } |
| 5901 | #endif |
| 5902 | } |
| 5903 | |
| 5904 | if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) || |
| 5905 | (ifp == nat->nat_ifps[1]))) { |
| 5906 | nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0], |
| 5907 | nat->nat_v[0]); |
| 5908 | if ((nat->nat_ifps[0] != NULL) && |
| 5909 | (nat->nat_ifps[0] != (void *)-1)) { |
| 5910 | nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); |
| 5911 | } |
| 5912 | if (nat->nat_ifnames[1][0] != '\0') { |
| 5913 | nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1], |
| 5914 | nat->nat_v[1]); |
| 5915 | } else { |
| 5916 | nat->nat_ifps[1] = nat->nat_ifps[0]; |
| 5917 | } |
| 5918 | if ((nat->nat_ifps[1] != NULL) && |
| 5919 | (nat->nat_ifps[1] != (void *)-1)) { |
| 5920 | nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); |
| 5921 | } |
| 5922 | ifp2 = nat->nat_ifps[0]; |
| 5923 | if (ifp2 == NULL) |
| 5924 | continue; |
| 5925 | |
| 5926 | /* |
| 5927 | * Change the map-to address to be the same as the |
| 5928 | * new one. |
| 5929 | */ |
| 5930 | sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); |
| 5931 | if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2, |
| 5932 | &in, NULL) != -1) { |
| 5933 | if (nat->nat_v[0] == 4) |
| 5934 | nat->nat_nsrcip = in.in4; |
| 5935 | } |
| 5936 | sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); |
| 5937 | |
| 5938 | if (sum1 == sum2) |
| 5939 | continue; |
| 5940 | /* |
| 5941 | * Readjust the checksum adjustment to take into |
| 5942 | * account the new IP#. |
| 5943 | */ |
| 5944 | CALC_SUMD(sum1, sum2, sumd); |
| 5945 | /* XXX - dont change for TCP when solaris does |
| 5946 | * hardware checksumming. |
| 5947 | */ |
| 5948 | sumd += nat->nat_sumd[0]; |
| 5949 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 5950 | nat->nat_sumd[1] = nat->nat_sumd[0]; |
| 5951 | } |
| 5952 | } |
| 5953 | |
| 5954 | for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) { |
| 5955 | char *base = n->in_names; |
| 5956 | |
| 5957 | if ((ifp == NULL) || (n->in_ifps[0] == ifp)) |
| 5958 | n->in_ifps[0] = ipf_resolvenic(softc, |
| 5959 | base + n->in_ifnames[0], |
| 5960 | n->in_v[0]); |
| 5961 | if ((ifp == NULL) || (n->in_ifps[1] == ifp)) |
| 5962 | n->in_ifps[1] = ipf_resolvenic(softc, |
| 5963 | base + n->in_ifnames[1], |
| 5964 | n->in_v[1]); |
| 5965 | |
| 5966 | if (n->in_redir & NAT_REDIRECT) |
| 5967 | idx = 1; |
| 5968 | else |
| 5969 | idx = 0; |
| 5970 | |
| 5971 | if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) && |
| 5972 | (n->in_ifps[idx] != NULL && |
| 5973 | n->in_ifps[idx] != (void *)-1)) { |
| 5974 | |
| 5975 | ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, |
| 5976 | 0, n->in_ifps[idx]); |
| 5977 | ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, |
| 5978 | 0, n->in_ifps[idx]); |
| 5979 | ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, |
| 5980 | 0, n->in_ifps[idx]); |
| 5981 | ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, |
| 5982 | 0, n->in_ifps[idx]); |
| 5983 | } |
| 5984 | } |
| 5985 | RWLOCK_EXIT(&softc->ipf_nat); |
| 5986 | SPL_X(s); |
| 5987 | } |
| 5988 | |
| 5989 | |
| 5990 | /* ------------------------------------------------------------------------ */ |
| 5991 | /* Function: ipf_nat_icmpquerytype */ |
| 5992 | /* Returns: int - 1 == success, 0 == failure */ |
| 5993 | /* Parameters: icmptype(I) - ICMP type number */ |
| 5994 | /* */ |
| 5995 | /* Tests to see if the ICMP type number passed is a query/response type or */ |
| 5996 | /* not. */ |
| 5997 | /* ------------------------------------------------------------------------ */ |
| 5998 | static int |
| 5999 | ipf_nat_icmpquerytype(int icmptype) |
| 6000 | { |
| 6001 | |
| 6002 | /* |
| 6003 | * For the ICMP query NAT code, it is essential that both the query |
| 6004 | * and the reply match on the NAT rule. Because the NAT structure |
| 6005 | * does not keep track of the icmptype, and a single NAT structure |
| 6006 | * is used for all icmp types with the same src, dest and id, we |
| 6007 | * simply define the replies as queries as well. The funny thing is, |
| 6008 | * although it seems silly to call a reply a query, this is exactly |
| 6009 | * as it is defined in the IPv4 specification |
| 6010 | */ |
| 6011 | switch (icmptype) |
| 6012 | { |
| 6013 | case ICMP_ECHOREPLY: |
| 6014 | case ICMP_ECHO: |
| 6015 | /* route aedvertisement/solliciation is currently unsupported: */ |
| 6016 | /* it would require rewriting the ICMP data section */ |
| 6017 | case ICMP_TSTAMP: |
| 6018 | case ICMP_TSTAMPREPLY: |
| 6019 | case ICMP_IREQ: |
| 6020 | case ICMP_IREQREPLY: |
| 6021 | case ICMP_MASKREQ: |
| 6022 | case ICMP_MASKREPLY: |
| 6023 | return 1; |
| 6024 | default: |
| 6025 | return 0; |
| 6026 | } |
| 6027 | } |
| 6028 | |
| 6029 | |
| 6030 | /* ------------------------------------------------------------------------ */ |
| 6031 | /* Function: nat_log */ |
| 6032 | /* Returns: Nil */ |
| 6033 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6034 | /* softn(I) - pointer to NAT context structure */ |
| 6035 | /* nat(I) - pointer to NAT structure */ |
| 6036 | /* action(I) - action related to NAT structure being performed */ |
| 6037 | /* */ |
| 6038 | /* Creates a NAT log entry. */ |
| 6039 | /* ------------------------------------------------------------------------ */ |
| 6040 | void |
| 6041 | ipf_nat_log(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, struct nat *nat, |
| 6042 | u_int action) |
| 6043 | { |
| 6044 | #ifdef IPFILTER_LOG |
| 6045 | # ifndef LARGE_NAT |
| 6046 | struct ipnat *np; |
| 6047 | int rulen; |
| 6048 | # endif |
| 6049 | struct natlog natl; |
| 6050 | void *items[1]; |
| 6051 | size_t sizes[1]; |
| 6052 | int types[1]; |
| 6053 | |
| 6054 | bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip, |
| 6055 | sizeof(natl.nl_osrcip)); |
| 6056 | bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip, |
| 6057 | sizeof(natl.nl_nsrcip)); |
| 6058 | bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip, |
| 6059 | sizeof(natl.nl_odstip)); |
| 6060 | bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip, |
| 6061 | sizeof(natl.nl_ndstip)); |
| 6062 | |
| 6063 | natl.nl_bytes[0] = nat->nat_bytes[0]; |
| 6064 | natl.nl_bytes[1] = nat->nat_bytes[1]; |
| 6065 | natl.nl_pkts[0] = nat->nat_pkts[0]; |
| 6066 | natl.nl_pkts[1] = nat->nat_pkts[1]; |
| 6067 | natl.nl_odstport = nat->nat_odport; |
| 6068 | natl.nl_osrcport = nat->nat_osport; |
| 6069 | natl.nl_nsrcport = nat->nat_nsport; |
| 6070 | natl.nl_ndstport = nat->nat_ndport; |
| 6071 | natl.nl_p[0] = nat->nat_pr[0]; |
| 6072 | natl.nl_p[1] = nat->nat_pr[1]; |
| 6073 | natl.nl_v[0] = nat->nat_v[0]; |
| 6074 | natl.nl_v[1] = nat->nat_v[1]; |
| 6075 | natl.nl_type = nat->nat_redir; |
| 6076 | natl.nl_action = action; |
| 6077 | natl.nl_rule = -1; |
| 6078 | |
| 6079 | bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0], |
| 6080 | sizeof(nat->nat_ifnames[0])); |
| 6081 | bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1], |
| 6082 | sizeof(nat->nat_ifnames[1])); |
| 6083 | |
| 6084 | # ifndef LARGE_NAT |
| 6085 | if (nat->nat_ptr != NULL) { |
| 6086 | for (rulen = 0, np = softn->ipf_nat_list; np != NULL; |
| 6087 | np = np->in_next, rulen++) |
| 6088 | if (np == nat->nat_ptr) { |
| 6089 | natl.nl_rule = rulen; |
| 6090 | break; |
| 6091 | } |
| 6092 | } |
| 6093 | # endif |
| 6094 | items[0] = &natl; |
| 6095 | sizes[0] = sizeof(natl); |
| 6096 | types[0] = 0; |
| 6097 | |
| 6098 | (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1); |
| 6099 | #endif |
| 6100 | } |
| 6101 | |
| 6102 | |
| 6103 | #if defined(__OpenBSD__) |
| 6104 | /* ------------------------------------------------------------------------ */ |
| 6105 | /* Function: ipf_nat_ifdetach */ |
| 6106 | /* Returns: Nil */ |
| 6107 | /* Parameters: ifp(I) - pointer to network interface */ |
| 6108 | /* */ |
| 6109 | /* Compatibility interface for OpenBSD to trigger the correct updating of */ |
| 6110 | /* interface references within IPFilter. */ |
| 6111 | /* ------------------------------------------------------------------------ */ |
| 6112 | void |
| 6113 | ipf_nat_ifdetach(ifp) |
| 6114 | void *ifp; |
| 6115 | { |
| 6116 | ipf_main_softc_t *softc; |
| 6117 | |
| 6118 | softc = ipf_get_softc(0); |
| 6119 | |
| 6120 | ipf_sync(ifp); |
| 6121 | return; |
| 6122 | } |
| 6123 | #endif |
| 6124 | |
| 6125 | |
| 6126 | /* ------------------------------------------------------------------------ */ |
| 6127 | /* Function: ipf_nat_rule_deref */ |
| 6128 | /* Returns: Nil */ |
| 6129 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6130 | /* inp(I) - pointer to pointer to NAT rule */ |
| 6131 | /* Write Locks: ipf_nat */ |
| 6132 | /* */ |
| 6133 | /* Dropping the refernce count for a rule means that whatever held the */ |
| 6134 | /* pointer to this rule (*inp) is no longer interested in it and when the */ |
| 6135 | /* reference count drops to zero, any resources allocated for the rule can */ |
| 6136 | /* be released and the rule itself free'd. */ |
| 6137 | /* ------------------------------------------------------------------------ */ |
| 6138 | void |
| 6139 | ipf_nat_rule_deref(ipf_main_softc_t *softc, ipnat_t **inp) |
| 6140 | { |
| 6141 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 6142 | ipnat_t *n; |
| 6143 | |
| 6144 | n = *inp; |
| 6145 | *inp = NULL; |
| 6146 | n->in_use--; |
| 6147 | if (n->in_use > 0) |
| 6148 | return; |
| 6149 | |
| 6150 | if (n->in_apr != NULL) |
| 6151 | ipf_proxy_deref(n->in_apr); |
| 6152 | |
| 6153 | ipf_nat_rule_fini(softc, n); |
| 6154 | |
| 6155 | if (n->in_redir & NAT_REDIRECT) { |
| 6156 | if ((n->in_flags & IPN_PROXYRULE) == 0) { |
| 6157 | ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr); |
| 6158 | } |
| 6159 | } |
| 6160 | if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { |
| 6161 | if ((n->in_flags & IPN_PROXYRULE) == 0) { |
| 6162 | ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map); |
| 6163 | } |
| 6164 | } |
| 6165 | |
| 6166 | if (n->in_tqehead[0] != NULL) { |
| 6167 | if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) { |
| 6168 | ipf_freetimeoutqueue(softc, n->in_tqehead[1]); |
| 6169 | } |
| 6170 | } |
| 6171 | |
| 6172 | if (n->in_tqehead[1] != NULL) { |
| 6173 | if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) { |
| 6174 | ipf_freetimeoutqueue(softc, n->in_tqehead[1]); |
| 6175 | } |
| 6176 | } |
| 6177 | |
| 6178 | if ((n->in_flags & IPN_PROXYRULE) == 0) { |
| 6179 | ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules); |
| 6180 | } |
| 6181 | |
| 6182 | MUTEX_DESTROY(&n->in_lock); |
| 6183 | |
| 6184 | KFREES(n, n->in_size); |
| 6185 | |
| 6186 | #if SOLARIS && !defined(INSTANCES) |
| 6187 | if (softn->ipf_nat_stats.ns_rules == 0) |
| 6188 | pfil_delayed_copy = 1; |
| 6189 | #endif |
| 6190 | } |
| 6191 | |
| 6192 | |
| 6193 | /* ------------------------------------------------------------------------ */ |
| 6194 | /* Function: ipf_nat_deref */ |
| 6195 | /* Returns: Nil */ |
| 6196 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6197 | /* natp(I) - pointer to pointer to NAT table entry */ |
| 6198 | /* */ |
| 6199 | /* Decrement the reference counter for this NAT table entry and free it if */ |
| 6200 | /* there are no more things using it. */ |
| 6201 | /* */ |
| 6202 | /* IF nat_ref == 1 when this function is called, then we have an orphan nat */ |
| 6203 | /* structure *because* it only gets called on paths _after_ nat_ref has been*/ |
| 6204 | /* incremented. If nat_ref == 1 then we shouldn't decrement it here */ |
| 6205 | /* because nat_delete() will do that and send nat_ref to -1. */ |
| 6206 | /* */ |
| 6207 | /* Holding the lock on nat_lock is required to serialise nat_delete() being */ |
| 6208 | /* called from a NAT flush ioctl with a deref happening because of a packet.*/ |
| 6209 | /* ------------------------------------------------------------------------ */ |
| 6210 | void |
| 6211 | ipf_nat_deref(ipf_main_softc_t *softc, nat_t **natp) |
| 6212 | { |
| 6213 | nat_t *nat; |
| 6214 | |
| 6215 | nat = *natp; |
| 6216 | *natp = NULL; |
| 6217 | |
| 6218 | MUTEX_ENTER(&nat->nat_lock); |
| 6219 | if (nat->nat_ref > 1) { |
| 6220 | nat->nat_ref--; |
| 6221 | ASSERT(nat->nat_ref >= 0); |
| 6222 | MUTEX_EXIT(&nat->nat_lock); |
| 6223 | return; |
| 6224 | } |
| 6225 | MUTEX_EXIT(&nat->nat_lock); |
| 6226 | |
| 6227 | WRITE_ENTER(&softc->ipf_nat); |
| 6228 | ipf_nat_delete(softc, nat, NL_EXPIRE); |
| 6229 | RWLOCK_EXIT(&softc->ipf_nat); |
| 6230 | } |
| 6231 | |
| 6232 | |
| 6233 | /* ------------------------------------------------------------------------ */ |
| 6234 | /* Function: ipf_nat_clone */ |
| 6235 | /* Returns: ipstate_t* - NULL == cloning failed, */ |
| 6236 | /* else pointer to new state structure */ |
| 6237 | /* Parameters: fin(I) - pointer to packet information */ |
| 6238 | /* is(I) - pointer to master state structure */ |
| 6239 | /* Write Lock: ipf_nat */ |
| 6240 | /* */ |
| 6241 | /* Create a "duplcate" state table entry from the master. */ |
| 6242 | /* ------------------------------------------------------------------------ */ |
| 6243 | nat_t * |
| 6244 | ipf_nat_clone(fr_info_t *fin, nat_t *nat) |
| 6245 | { |
| 6246 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 6247 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 6248 | frentry_t *fr; |
| 6249 | nat_t *clone; |
| 6250 | ipnat_t *np; |
| 6251 | |
| 6252 | KMALLOC(clone, nat_t *); |
| 6253 | if (clone == NULL) { |
| 6254 | NBUMPSIDED(fin->fin_out, ns_clone_nomem); |
| 6255 | return NULL; |
| 6256 | } |
| 6257 | bcopy((char *)nat, (char *)clone, sizeof(*clone)); |
| 6258 | |
| 6259 | MUTEX_NUKE(&clone->nat_lock); |
| 6260 | |
| 6261 | clone->nat_rev = fin->fin_rev; |
| 6262 | clone->nat_aps = NULL; |
| 6263 | /* |
| 6264 | * Initialize all these so that ipf_nat_delete() doesn't cause a crash. |
| 6265 | */ |
| 6266 | clone->nat_tqe.tqe_pnext = NULL; |
| 6267 | clone->nat_tqe.tqe_next = NULL; |
| 6268 | clone->nat_tqe.tqe_ifq = NULL; |
| 6269 | clone->nat_tqe.tqe_parent = clone; |
| 6270 | |
| 6271 | clone->nat_flags &= ~SI_CLONE; |
| 6272 | clone->nat_flags |= SI_CLONED; |
| 6273 | |
| 6274 | if (clone->nat_hm) |
| 6275 | clone->nat_hm->hm_ref++; |
| 6276 | |
| 6277 | if (ipf_nat_insert(softc, softn, clone) == -1) { |
| 6278 | KFREE(clone); |
| 6279 | NBUMPSIDED(fin->fin_out, ns_insert_fail); |
| 6280 | return NULL; |
| 6281 | } |
| 6282 | |
| 6283 | np = clone->nat_ptr; |
| 6284 | if (np != NULL) { |
| 6285 | if (softn->ipf_nat_logging) |
| 6286 | ipf_nat_log(softc, softn, clone, NL_CLONE); |
| 6287 | np->in_use++; |
| 6288 | } |
| 6289 | fr = clone->nat_fr; |
| 6290 | if (fr != NULL) { |
| 6291 | MUTEX_ENTER(&fr->fr_lock); |
| 6292 | fr->fr_ref++; |
| 6293 | MUTEX_EXIT(&fr->fr_lock); |
| 6294 | } |
| 6295 | |
| 6296 | |
| 6297 | /* |
| 6298 | * Because the clone is created outside the normal loop of things and |
| 6299 | * TCP has special needs in terms of state, initialise the timeout |
| 6300 | * state of the new NAT from here. |
| 6301 | */ |
| 6302 | if (clone->nat_pr[0] == IPPROTO_TCP) { |
| 6303 | (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq, |
| 6304 | clone->nat_flags, 2); |
| 6305 | } |
| 6306 | clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone); |
| 6307 | if (softn->ipf_nat_logging) |
| 6308 | ipf_nat_log(softc, softn, clone, NL_CLONE); |
| 6309 | return clone; |
| 6310 | } |
| 6311 | |
| 6312 | |
| 6313 | /* ------------------------------------------------------------------------ */ |
| 6314 | /* Function: ipf_nat_wildok */ |
| 6315 | /* Returns: int - 1 == packet's ports match wildcards */ |
| 6316 | /* 0 == packet's ports don't match wildcards */ |
| 6317 | /* Parameters: nat(I) - NAT entry */ |
| 6318 | /* sport(I) - source port */ |
| 6319 | /* dport(I) - destination port */ |
| 6320 | /* flags(I) - wildcard flags */ |
| 6321 | /* dir(I) - packet direction */ |
| 6322 | /* */ |
| 6323 | /* Use NAT entry and packet direction to determine which combination of */ |
| 6324 | /* wildcard flags should be used. */ |
| 6325 | /* ------------------------------------------------------------------------ */ |
| 6326 | int |
| 6327 | ipf_nat_wildok(nat_t *nat, int sport, int dport, int flags, int dir) |
| 6328 | { |
| 6329 | /* |
| 6330 | * When called by dir is set to |
| 6331 | * nat_inlookup NAT_INBOUND (0) |
| 6332 | * nat_outlookup NAT_OUTBOUND (1) |
| 6333 | * |
| 6334 | * We simply combine the packet's direction in dir with the original |
| 6335 | * "intended" direction of that NAT entry in nat->nat_dir to decide |
| 6336 | * which combination of wildcard flags to allow. |
| 6337 | */ |
| 6338 | switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))) |
| 6339 | { |
| 6340 | case 3: /* outbound packet / outbound entry */ |
| 6341 | if (((nat->nat_osport == sport) || |
| 6342 | (flags & SI_W_SPORT)) && |
| 6343 | ((nat->nat_odport == dport) || |
| 6344 | (flags & SI_W_DPORT))) |
| 6345 | return 1; |
| 6346 | break; |
| 6347 | case 2: /* outbound packet / inbound entry */ |
| 6348 | if (((nat->nat_osport == dport) || |
| 6349 | (flags & SI_W_SPORT)) && |
| 6350 | ((nat->nat_odport == sport) || |
| 6351 | (flags & SI_W_DPORT))) |
| 6352 | return 1; |
| 6353 | break; |
| 6354 | case 1: /* inbound packet / outbound entry */ |
| 6355 | if (((nat->nat_osport == dport) || |
| 6356 | (flags & SI_W_SPORT)) && |
| 6357 | ((nat->nat_odport == sport) || |
| 6358 | (flags & SI_W_DPORT))) |
| 6359 | return 1; |
| 6360 | break; |
| 6361 | case 0: /* inbound packet / inbound entry */ |
| 6362 | if (((nat->nat_osport == sport) || |
| 6363 | (flags & SI_W_SPORT)) && |
| 6364 | ((nat->nat_odport == dport) || |
| 6365 | (flags & SI_W_DPORT))) |
| 6366 | return 1; |
| 6367 | break; |
| 6368 | default: |
| 6369 | break; |
| 6370 | } |
| 6371 | |
| 6372 | return(0); |
| 6373 | } |
| 6374 | |
| 6375 | |
| 6376 | /* ------------------------------------------------------------------------ */ |
| 6377 | /* Function: nat_mssclamp */ |
| 6378 | /* Returns: Nil */ |
| 6379 | /* Parameters: tcp(I) - pointer to TCP header */ |
| 6380 | /* maxmss(I) - value to clamp the TCP MSS to */ |
| 6381 | /* fin(I) - pointer to packet information */ |
| 6382 | /* csump(I) - pointer to TCP checksum */ |
| 6383 | /* */ |
| 6384 | /* Check for MSS option and clamp it if necessary. If found and changed, */ |
| 6385 | /* then the TCP header checksum will be updated to reflect the change in */ |
| 6386 | /* the MSS. */ |
| 6387 | /* ------------------------------------------------------------------------ */ |
| 6388 | static void |
| 6389 | ipf_nat_mssclamp(tcphdr_t *tcp, u_32_t maxmss, fr_info_t *fin, u_short *csump) |
| 6390 | { |
| 6391 | u_char *cp, *ep, opt; |
| 6392 | int hlen, advance; |
| 6393 | u_32_t mss, sumd; |
| 6394 | |
| 6395 | hlen = TCP_OFF(tcp) << 2; |
| 6396 | if (hlen > sizeof(*tcp)) { |
| 6397 | cp = (u_char *)tcp + sizeof(*tcp); |
| 6398 | ep = (u_char *)tcp + hlen; |
| 6399 | |
| 6400 | while (cp < ep) { |
| 6401 | opt = cp[0]; |
| 6402 | if (opt == TCPOPT_EOL) |
| 6403 | break; |
| 6404 | else if (opt == TCPOPT_NOP) { |
| 6405 | cp++; |
| 6406 | continue; |
| 6407 | } |
| 6408 | |
| 6409 | if (cp + 1 >= ep) |
| 6410 | break; |
| 6411 | advance = cp[1]; |
| 6412 | if ((cp + advance > ep) || (advance <= 0)) |
| 6413 | break; |
| 6414 | switch (opt) |
| 6415 | { |
| 6416 | case TCPOPT_MAXSEG: |
| 6417 | if (advance != 4) |
| 6418 | break; |
| 6419 | mss = cp[2] * 256 + cp[3]; |
| 6420 | if (mss > maxmss) { |
| 6421 | cp[2] = maxmss / 256; |
| 6422 | cp[3] = maxmss & 0xff; |
| 6423 | CALC_SUMD(mss, maxmss, sumd); |
| 6424 | ipf_fix_outcksum(0, csump, sumd, 0); |
| 6425 | } |
| 6426 | break; |
| 6427 | default: |
| 6428 | /* ignore unknown options */ |
| 6429 | break; |
| 6430 | } |
| 6431 | |
| 6432 | cp += advance; |
| 6433 | } |
| 6434 | } |
| 6435 | } |
| 6436 | |
| 6437 | |
| 6438 | /* ------------------------------------------------------------------------ */ |
| 6439 | /* Function: ipf_nat_setqueue */ |
| 6440 | /* Returns: Nil */ |
| 6441 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6442 | /* softn(I) - pointer to NAT context structure */ |
| 6443 | /* nat(I)- pointer to NAT structure */ |
| 6444 | /* Locks: ipf_nat (read or write) */ |
| 6445 | /* */ |
| 6446 | /* Put the NAT entry on its default queue entry, using rev as a helped in */ |
| 6447 | /* determining which queue it should be placed on. */ |
| 6448 | /* ------------------------------------------------------------------------ */ |
| 6449 | void |
| 6450 | ipf_nat_setqueue(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) |
| 6451 | { |
| 6452 | ipftq_t *oifq, *nifq; |
| 6453 | int rev = nat->nat_rev; |
| 6454 | |
| 6455 | if (nat->nat_ptr != NULL) |
| 6456 | nifq = nat->nat_ptr->in_tqehead[rev]; |
| 6457 | else |
| 6458 | nifq = NULL; |
| 6459 | |
| 6460 | if (nifq == NULL) { |
| 6461 | switch (nat->nat_pr[0]) |
| 6462 | { |
| 6463 | case IPPROTO_UDP : |
| 6464 | nifq = &softn->ipf_nat_udptq; |
| 6465 | break; |
| 6466 | case IPPROTO_ICMP : |
| 6467 | nifq = &softn->ipf_nat_icmptq; |
| 6468 | break; |
| 6469 | case IPPROTO_TCP : |
| 6470 | nifq = softn->ipf_nat_tcptq + |
| 6471 | nat->nat_tqe.tqe_state[rev]; |
| 6472 | break; |
| 6473 | default : |
| 6474 | nifq = &softn->ipf_nat_iptq; |
| 6475 | break; |
| 6476 | } |
| 6477 | } |
| 6478 | |
| 6479 | oifq = nat->nat_tqe.tqe_ifq; |
| 6480 | /* |
| 6481 | * If it's currently on a timeout queue, move it from one queue to |
| 6482 | * another, else put it on the end of the newly determined queue. |
| 6483 | */ |
| 6484 | if (oifq != NULL) |
| 6485 | ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq); |
| 6486 | else |
| 6487 | ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat); |
| 6488 | return; |
| 6489 | } |
| 6490 | |
| 6491 | |
| 6492 | /* ------------------------------------------------------------------------ */ |
| 6493 | /* Function: nat_getnext */ |
| 6494 | /* Returns: int - 0 == ok, else error */ |
| 6495 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6496 | /* t(I) - pointer to ipftoken structure */ |
| 6497 | /* itp(I) - pointer to ipfgeniter_t structure */ |
| 6498 | /* */ |
| 6499 | /* Fetch the next nat/ipnat structure pointer from the linked list and */ |
| 6500 | /* copy it out to the storage space pointed to by itp_data. The next item */ |
| 6501 | /* in the list to look at is put back in the ipftoken struture. */ |
| 6502 | /* ------------------------------------------------------------------------ */ |
| 6503 | static int |
| 6504 | ipf_nat_getnext(ipf_main_softc_t *softc, ipftoken_t *t, ipfgeniter_t *itp, |
| 6505 | ipfobj_t *objp) |
| 6506 | { |
| 6507 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 6508 | hostmap_t *hm, *nexthm = NULL, zerohm; |
| 6509 | ipnat_t *ipn, *nextipnat = NULL, zeroipn; |
| 6510 | nat_t *nat, *nextnat = NULL, zeronat; |
| 6511 | int error = 0; |
| 6512 | void *nnext; |
| 6513 | |
| 6514 | if (itp->igi_nitems != 1) { |
| 6515 | IPFERROR(60075); |
| 6516 | return ENOSPC; |
| 6517 | } |
| 6518 | |
| 6519 | READ_ENTER(&softc->ipf_nat); |
| 6520 | |
| 6521 | switch (itp->igi_type) |
| 6522 | { |
| 6523 | case IPFGENITER_HOSTMAP : |
| 6524 | hm = t->ipt_data; |
| 6525 | if (hm == NULL) { |
| 6526 | nexthm = softn->ipf_hm_maplist; |
| 6527 | } else { |
| 6528 | nexthm = hm->hm_next; |
| 6529 | } |
| 6530 | if (nexthm != NULL) { |
| 6531 | ATOMIC_INC32(nexthm->hm_ref); |
| 6532 | t->ipt_data = nexthm; |
| 6533 | } else { |
| 6534 | bzero(&zerohm, sizeof(zerohm)); |
| 6535 | nexthm = &zerohm; |
| 6536 | t->ipt_data = NULL; |
| 6537 | } |
| 6538 | nnext = nexthm->hm_next; |
| 6539 | break; |
| 6540 | |
| 6541 | case IPFGENITER_IPNAT : |
| 6542 | ipn = t->ipt_data; |
| 6543 | if (ipn == NULL) { |
| 6544 | nextipnat = softn->ipf_nat_list; |
| 6545 | } else { |
| 6546 | nextipnat = ipn->in_next; |
| 6547 | } |
| 6548 | if (nextipnat != NULL) { |
| 6549 | ATOMIC_INC32(nextipnat->in_use); |
| 6550 | t->ipt_data = nextipnat; |
| 6551 | } else { |
| 6552 | bzero(&zeroipn, sizeof(zeroipn)); |
| 6553 | nextipnat = &zeroipn; |
| 6554 | t->ipt_data = NULL; |
| 6555 | } |
| 6556 | nnext = nextipnat->in_next; |
| 6557 | break; |
| 6558 | |
| 6559 | case IPFGENITER_NAT : |
| 6560 | nat = t->ipt_data; |
| 6561 | if (nat == NULL) { |
| 6562 | nextnat = softn->ipf_nat_instances; |
| 6563 | } else { |
| 6564 | nextnat = nat->nat_next; |
| 6565 | } |
| 6566 | if (nextnat != NULL) { |
| 6567 | MUTEX_ENTER(&nextnat->nat_lock); |
| 6568 | nextnat->nat_ref++; |
| 6569 | MUTEX_EXIT(&nextnat->nat_lock); |
| 6570 | t->ipt_data = nextnat; |
| 6571 | } else { |
| 6572 | bzero(&zeronat, sizeof(zeronat)); |
| 6573 | nextnat = &zeronat; |
| 6574 | t->ipt_data = NULL; |
| 6575 | } |
| 6576 | nnext = nextnat->nat_next; |
| 6577 | break; |
| 6578 | |
| 6579 | default : |
| 6580 | RWLOCK_EXIT(&softc->ipf_nat); |
| 6581 | IPFERROR(60055); |
| 6582 | return EINVAL; |
| 6583 | } |
| 6584 | |
| 6585 | RWLOCK_EXIT(&softc->ipf_nat); |
| 6586 | |
| 6587 | objp->ipfo_ptr = itp->igi_data; |
| 6588 | |
| 6589 | switch (itp->igi_type) |
| 6590 | { |
| 6591 | case IPFGENITER_HOSTMAP : |
| 6592 | error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm)); |
| 6593 | if (error != 0) { |
| 6594 | IPFERROR(60049); |
| 6595 | error = EFAULT; |
| 6596 | } |
| 6597 | if (hm != NULL) { |
| 6598 | WRITE_ENTER(&softc->ipf_nat); |
| 6599 | ipf_nat_hostmapdel(softc, &hm); |
| 6600 | RWLOCK_EXIT(&softc->ipf_nat); |
| 6601 | } |
| 6602 | break; |
| 6603 | |
| 6604 | case IPFGENITER_IPNAT : |
| 6605 | objp->ipfo_size = nextipnat->in_size; |
| 6606 | objp->ipfo_type = IPFOBJ_IPNAT; |
| 6607 | error = ipf_outobjk(softc, objp, nextipnat); |
| 6608 | if (ipn != NULL) { |
| 6609 | WRITE_ENTER(&softc->ipf_nat); |
| 6610 | ipf_nat_rule_deref(softc, &ipn); |
| 6611 | RWLOCK_EXIT(&softc->ipf_nat); |
| 6612 | } |
| 6613 | break; |
| 6614 | |
| 6615 | case IPFGENITER_NAT : |
| 6616 | objp->ipfo_size = sizeof(nat_t); |
| 6617 | objp->ipfo_type = IPFOBJ_NAT; |
| 6618 | error = ipf_outobjk(softc, objp, nextnat); |
| 6619 | if (nat != NULL) |
| 6620 | ipf_nat_deref(softc, &nat); |
| 6621 | |
| 6622 | break; |
| 6623 | } |
| 6624 | |
| 6625 | if (nnext == NULL) |
| 6626 | ipf_token_mark_complete(t); |
| 6627 | |
| 6628 | return error; |
| 6629 | } |
| 6630 | |
| 6631 | |
| 6632 | /* ------------------------------------------------------------------------ */ |
| 6633 | /* Function: nat_extraflush */ |
| 6634 | /* Returns: int - 0 == success, -1 == failure */ |
| 6635 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6636 | /* softn(I) - pointer to NAT context structure */ |
| 6637 | /* which(I) - how to flush the active NAT table */ |
| 6638 | /* Write Locks: ipf_nat */ |
| 6639 | /* */ |
| 6640 | /* Flush nat tables. Three actions currently defined: */ |
| 6641 | /* which == 0 : flush all nat table entries */ |
| 6642 | /* which == 1 : flush TCP connections which have started to close but are */ |
| 6643 | /* stuck for some reason. */ |
| 6644 | /* which == 2 : flush TCP connections which have been idle for a long time, */ |
| 6645 | /* starting at > 4 days idle and working back in successive half-*/ |
| 6646 | /* days to at most 12 hours old. If this fails to free enough */ |
| 6647 | /* slots then work backwards in half hour slots to 30 minutes. */ |
| 6648 | /* If that too fails, then work backwards in 30 second intervals */ |
| 6649 | /* for the last 30 minutes to at worst 30 seconds idle. */ |
| 6650 | /* ------------------------------------------------------------------------ */ |
| 6651 | static int |
| 6652 | (ipf_main_softc_t *softc, ipf_nat_softc_t *softn, int which) |
| 6653 | { |
| 6654 | nat_t *nat, **natp; |
| 6655 | ipftqent_t *tqn; |
| 6656 | ipftq_t *ifq; |
| 6657 | int removed; |
| 6658 | SPL_INT(s); |
| 6659 | |
| 6660 | removed = 0; |
| 6661 | |
| 6662 | SPL_NET(s); |
| 6663 | switch (which) |
| 6664 | { |
| 6665 | case 0 : |
| 6666 | softn->ipf_nat_stats.ns_flush_all++; |
| 6667 | /* |
| 6668 | * Style 0 flush removes everything... |
| 6669 | */ |
| 6670 | for (natp = &softn->ipf_nat_instances; |
| 6671 | ((nat = *natp) != NULL); ) { |
| 6672 | ipf_nat_delete(softc, nat, NL_FLUSH); |
| 6673 | removed++; |
| 6674 | } |
| 6675 | break; |
| 6676 | |
| 6677 | case 1 : |
| 6678 | softn->ipf_nat_stats.ns_flush_closing++; |
| 6679 | /* |
| 6680 | * Since we're only interested in things that are closing, |
| 6681 | * we can start with the appropriate timeout queue. |
| 6682 | */ |
| 6683 | for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT; |
| 6684 | ifq != NULL; ifq = ifq->ifq_next) { |
| 6685 | |
| 6686 | for (tqn = ifq->ifq_head; tqn != NULL; ) { |
| 6687 | nat = tqn->tqe_parent; |
| 6688 | tqn = tqn->tqe_next; |
| 6689 | if (nat->nat_pr[0] != IPPROTO_TCP || |
| 6690 | nat->nat_pr[1] != IPPROTO_TCP) |
| 6691 | break; |
| 6692 | ipf_nat_delete(softc, nat, NL_EXPIRE); |
| 6693 | removed++; |
| 6694 | } |
| 6695 | } |
| 6696 | |
| 6697 | /* |
| 6698 | * Also need to look through the user defined queues. |
| 6699 | */ |
| 6700 | for (ifq = softn->ipf_nat_utqe; ifq != NULL; |
| 6701 | ifq = ifq->ifq_next) { |
| 6702 | for (tqn = ifq->ifq_head; tqn != NULL; ) { |
| 6703 | nat = tqn->tqe_parent; |
| 6704 | tqn = tqn->tqe_next; |
| 6705 | if (nat->nat_pr[0] != IPPROTO_TCP || |
| 6706 | nat->nat_pr[1] != IPPROTO_TCP) |
| 6707 | continue; |
| 6708 | |
| 6709 | if ((nat->nat_tcpstate[0] > |
| 6710 | IPF_TCPS_ESTABLISHED) && |
| 6711 | (nat->nat_tcpstate[1] > |
| 6712 | IPF_TCPS_ESTABLISHED)) { |
| 6713 | ipf_nat_delete(softc, nat, NL_EXPIRE); |
| 6714 | removed++; |
| 6715 | } |
| 6716 | } |
| 6717 | } |
| 6718 | break; |
| 6719 | |
| 6720 | /* |
| 6721 | * Args 5-11 correspond to flushing those particular states |
| 6722 | * for TCP connections. |
| 6723 | */ |
| 6724 | case IPF_TCPS_CLOSE_WAIT : |
| 6725 | case IPF_TCPS_FIN_WAIT_1 : |
| 6726 | case IPF_TCPS_CLOSING : |
| 6727 | case IPF_TCPS_LAST_ACK : |
| 6728 | case IPF_TCPS_FIN_WAIT_2 : |
| 6729 | case IPF_TCPS_TIME_WAIT : |
| 6730 | case IPF_TCPS_CLOSED : |
| 6731 | softn->ipf_nat_stats.ns_flush_state++; |
| 6732 | tqn = softn->ipf_nat_tcptq[which].ifq_head; |
| 6733 | while (tqn != NULL) { |
| 6734 | nat = tqn->tqe_parent; |
| 6735 | tqn = tqn->tqe_next; |
| 6736 | ipf_nat_delete(softc, nat, NL_FLUSH); |
| 6737 | removed++; |
| 6738 | } |
| 6739 | break; |
| 6740 | |
| 6741 | default : |
| 6742 | if (which < 30) |
| 6743 | break; |
| 6744 | |
| 6745 | softn->ipf_nat_stats.ns_flush_timeout++; |
| 6746 | /* |
| 6747 | * Take a large arbitrary number to mean the number of seconds |
| 6748 | * for which which consider to be the maximum value we'll allow |
| 6749 | * the expiration to be. |
| 6750 | */ |
| 6751 | which = IPF_TTLVAL(which); |
| 6752 | for (natp = &softn->ipf_nat_instances; |
| 6753 | ((nat = *natp) != NULL); ) { |
| 6754 | if (softc->ipf_ticks - nat->nat_touched > which) { |
| 6755 | ipf_nat_delete(softc, nat, NL_FLUSH); |
| 6756 | removed++; |
| 6757 | } else |
| 6758 | natp = &nat->nat_next; |
| 6759 | } |
| 6760 | break; |
| 6761 | } |
| 6762 | |
| 6763 | if (which != 2) { |
| 6764 | SPL_X(s); |
| 6765 | return removed; |
| 6766 | } |
| 6767 | |
| 6768 | softn->ipf_nat_stats.ns_flush_queue++; |
| 6769 | |
| 6770 | /* |
| 6771 | * Asked to remove inactive entries because the table is full, try |
| 6772 | * again, 3 times, if first attempt failed with a different criteria |
| 6773 | * each time. The order tried in must be in decreasing age. |
| 6774 | * Another alternative is to implement random drop and drop N entries |
| 6775 | * at random until N have been freed up. |
| 6776 | */ |
| 6777 | if (softc->ipf_ticks - softn->ipf_nat_last_force_flush > |
| 6778 | IPF_TTLVAL(5)) { |
| 6779 | softn->ipf_nat_last_force_flush = softc->ipf_ticks; |
| 6780 | |
| 6781 | removed = ipf_queueflush(softc, ipf_nat_flush_entry, |
| 6782 | softn->ipf_nat_tcptq, |
| 6783 | softn->ipf_nat_utqe, |
| 6784 | &softn->ipf_nat_stats.ns_active, |
| 6785 | softn->ipf_nat_table_sz, |
| 6786 | softn->ipf_nat_table_wm_low); |
| 6787 | } |
| 6788 | |
| 6789 | SPL_X(s); |
| 6790 | return removed; |
| 6791 | } |
| 6792 | |
| 6793 | |
| 6794 | /* ------------------------------------------------------------------------ */ |
| 6795 | /* Function: ipf_nat_flush_entry */ |
| 6796 | /* Returns: 0 - always succeeds */ |
| 6797 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6798 | /* entry(I) - pointer to NAT entry */ |
| 6799 | /* Write Locks: ipf_nat */ |
| 6800 | /* */ |
| 6801 | /* This function is a stepping stone between ipf_queueflush() and */ |
| 6802 | /* nat_dlete(). It is used so we can provide a uniform interface via the */ |
| 6803 | /* ipf_queueflush() function. Since the nat_delete() function returns void */ |
| 6804 | /* we translate that to mean it always succeeds in deleting something. */ |
| 6805 | /* ------------------------------------------------------------------------ */ |
| 6806 | static int |
| 6807 | ipf_nat_flush_entry(ipf_main_softc_t *softc, void *entry) |
| 6808 | { |
| 6809 | ipf_nat_delete(softc, entry, NL_FLUSH); |
| 6810 | return 0; |
| 6811 | } |
| 6812 | |
| 6813 | |
| 6814 | /* ------------------------------------------------------------------------ */ |
| 6815 | /* Function: ipf_nat_iterator */ |
| 6816 | /* Returns: int - 0 == ok, else error */ |
| 6817 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6818 | /* token(I) - pointer to ipftoken structure */ |
| 6819 | /* itp(I) - pointer to ipfgeniter_t structure */ |
| 6820 | /* obj(I) - pointer to data description structure */ |
| 6821 | /* */ |
| 6822 | /* This function acts as a handler for the SIOCGENITER ioctls that use a */ |
| 6823 | /* generic structure to iterate through a list. There are three different */ |
| 6824 | /* linked lists of NAT related information to go through: NAT rules, active */ |
| 6825 | /* NAT mappings and the NAT fragment cache. */ |
| 6826 | /* ------------------------------------------------------------------------ */ |
| 6827 | static int |
| 6828 | ipf_nat_iterator(ipf_main_softc_t *softc, ipftoken_t *token, ipfgeniter_t *itp, |
| 6829 | ipfobj_t *obj) |
| 6830 | { |
| 6831 | int error; |
| 6832 | |
| 6833 | if (itp->igi_data == NULL) { |
| 6834 | IPFERROR(60052); |
| 6835 | return EFAULT; |
| 6836 | } |
| 6837 | |
| 6838 | switch (itp->igi_type) |
| 6839 | { |
| 6840 | case IPFGENITER_HOSTMAP : |
| 6841 | case IPFGENITER_IPNAT : |
| 6842 | case IPFGENITER_NAT : |
| 6843 | error = ipf_nat_getnext(softc, token, itp, obj); |
| 6844 | break; |
| 6845 | |
| 6846 | case IPFGENITER_NATFRAG : |
| 6847 | error = ipf_frag_nat_next(softc, token, itp); |
| 6848 | break; |
| 6849 | default : |
| 6850 | IPFERROR(60053); |
| 6851 | error = EINVAL; |
| 6852 | break; |
| 6853 | } |
| 6854 | |
| 6855 | return error; |
| 6856 | } |
| 6857 | |
| 6858 | |
| 6859 | /* ------------------------------------------------------------------------ */ |
| 6860 | /* Function: ipf_nat_setpending */ |
| 6861 | /* Returns: Nil */ |
| 6862 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 6863 | /* nat(I) - pointer to NAT structure */ |
| 6864 | /* Locks: ipf_nat (read or write) */ |
| 6865 | /* */ |
| 6866 | /* Put the NAT entry on to the pending queue - this queue has a very short */ |
| 6867 | /* lifetime where items are put that can't be deleted straight away because */ |
| 6868 | /* of locking issues but we want to delete them ASAP, anyway. In calling */ |
| 6869 | /* this function, it is assumed that the owner (if there is one, as shown */ |
| 6870 | /* by nat_me) is no longer interested in it. */ |
| 6871 | /* ------------------------------------------------------------------------ */ |
| 6872 | void |
| 6873 | ipf_nat_setpending(ipf_main_softc_t *softc, nat_t *nat) |
| 6874 | { |
| 6875 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 6876 | ipftq_t *oifq; |
| 6877 | |
| 6878 | oifq = nat->nat_tqe.tqe_ifq; |
| 6879 | if (oifq != NULL) |
| 6880 | ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, |
| 6881 | &softn->ipf_nat_pending); |
| 6882 | else |
| 6883 | ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, |
| 6884 | &softn->ipf_nat_pending, nat); |
| 6885 | |
| 6886 | if (nat->nat_me != NULL) { |
| 6887 | *nat->nat_me = NULL; |
| 6888 | nat->nat_me = NULL; |
| 6889 | nat->nat_ref--; |
| 6890 | ASSERT(nat->nat_ref >= 0); |
| 6891 | } |
| 6892 | } |
| 6893 | |
| 6894 | |
| 6895 | /* ------------------------------------------------------------------------ */ |
| 6896 | /* Function: nat_newrewrite */ |
| 6897 | /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ |
| 6898 | /* allow rule to be moved if IPN_ROUNDR is set. */ |
| 6899 | /* Parameters: fin(I) - pointer to packet information */ |
| 6900 | /* nat(I) - pointer to NAT entry */ |
| 6901 | /* ni(I) - pointer to structure with misc. information needed */ |
| 6902 | /* to create new NAT entry. */ |
| 6903 | /* Write Lock: ipf_nat */ |
| 6904 | /* */ |
| 6905 | /* This function is responsible for setting up an active NAT session where */ |
| 6906 | /* we are changing both the source and destination parameters at the same */ |
| 6907 | /* time. The loop in here works differently to elsewhere - each iteration */ |
| 6908 | /* is responsible for changing a single parameter that can be incremented. */ |
| 6909 | /* So one pass may increase the source IP#, next source port, next dest. IP#*/ |
| 6910 | /* and the last destination port for a total of 4 iterations to try each. */ |
| 6911 | /* This is done to try and exhaustively use the translation space available.*/ |
| 6912 | /* ------------------------------------------------------------------------ */ |
| 6913 | static int |
| 6914 | ipf_nat_newrewrite(fr_info_t *fin, nat_t *nat, natinfo_t *nai) |
| 6915 | { |
| 6916 | int src_search = 1; |
| 6917 | int dst_search = 1; |
| 6918 | fr_info_t frnat; |
| 6919 | u_32_t flags; |
| 6920 | u_short swap; |
| 6921 | ipnat_t *np; |
| 6922 | nat_t *natl; |
| 6923 | int l = 0; |
| 6924 | int changed; |
| 6925 | |
| 6926 | natl = NULL; |
| 6927 | changed = -1; |
| 6928 | np = nai->nai_np; |
| 6929 | flags = nat->nat_flags; |
| 6930 | bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); |
| 6931 | |
| 6932 | nat->nat_hm = NULL; |
| 6933 | |
| 6934 | do { |
| 6935 | changed = -1; |
| 6936 | /* TRACE (l, src_search, dst_search, np) */ |
| 6937 | |
| 6938 | if ((src_search == 0) && (np->in_spnext == 0) && |
| 6939 | (dst_search == 0) && (np->in_dpnext == 0)) { |
| 6940 | if (l > 0) |
| 6941 | return -1; |
| 6942 | } |
| 6943 | |
| 6944 | /* |
| 6945 | * Find a new source address |
| 6946 | */ |
| 6947 | if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr, |
| 6948 | &frnat.fin_saddr) == -1) { |
| 6949 | return -1; |
| 6950 | } |
| 6951 | |
| 6952 | if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) { |
| 6953 | src_search = 0; |
| 6954 | if (np->in_stepnext == 0) |
| 6955 | np->in_stepnext = 1; |
| 6956 | |
| 6957 | } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { |
| 6958 | src_search = 0; |
| 6959 | if (np->in_stepnext == 0) |
| 6960 | np->in_stepnext = 1; |
| 6961 | |
| 6962 | } else if (np->in_nsrcmsk == 0xffffffff) { |
| 6963 | src_search = 0; |
| 6964 | if (np->in_stepnext == 0) |
| 6965 | np->in_stepnext = 1; |
| 6966 | |
| 6967 | } else if (np->in_nsrcmsk != 0xffffffff) { |
| 6968 | if (np->in_stepnext == 0 && changed == -1) { |
| 6969 | np->in_snip++; |
| 6970 | np->in_stepnext++; |
| 6971 | changed = 0; |
| 6972 | } |
| 6973 | } |
| 6974 | |
| 6975 | if ((flags & IPN_TCPUDPICMP) != 0) { |
| 6976 | if (np->in_spnext != 0) |
| 6977 | frnat.fin_data[0] = np->in_spnext; |
| 6978 | |
| 6979 | /* |
| 6980 | * Standard port translation. Select next port. |
| 6981 | */ |
| 6982 | if ((flags & IPN_FIXEDSPORT) != 0) { |
| 6983 | np->in_stepnext = 2; |
| 6984 | } else if ((np->in_stepnext == 1) && |
| 6985 | (changed == -1) && (natl != NULL)) { |
| 6986 | np->in_spnext++; |
| 6987 | np->in_stepnext++; |
| 6988 | changed = 1; |
| 6989 | if (np->in_spnext > np->in_spmax) |
| 6990 | np->in_spnext = np->in_spmin; |
| 6991 | } |
| 6992 | } else { |
| 6993 | np->in_stepnext = 2; |
| 6994 | } |
| 6995 | np->in_stepnext &= 0x3; |
| 6996 | |
| 6997 | /* |
| 6998 | * Find a new destination address |
| 6999 | */ |
| 7000 | /* TRACE (fin, np, l, frnat) */ |
| 7001 | |
| 7002 | if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr, |
| 7003 | &frnat.fin_daddr) == -1) |
| 7004 | return -1; |
| 7005 | if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { |
| 7006 | dst_search = 0; |
| 7007 | if (np->in_stepnext == 2) |
| 7008 | np->in_stepnext = 3; |
| 7009 | |
| 7010 | } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) { |
| 7011 | dst_search = 0; |
| 7012 | if (np->in_stepnext == 2) |
| 7013 | np->in_stepnext = 3; |
| 7014 | |
| 7015 | } else if (np->in_ndstmsk == 0xffffffff) { |
| 7016 | dst_search = 0; |
| 7017 | if (np->in_stepnext == 2) |
| 7018 | np->in_stepnext = 3; |
| 7019 | |
| 7020 | } else if (np->in_ndstmsk != 0xffffffff) { |
| 7021 | if ((np->in_stepnext == 2) && (changed == -1) && |
| 7022 | (natl != NULL)) { |
| 7023 | changed = 2; |
| 7024 | np->in_stepnext++; |
| 7025 | np->in_dnip++; |
| 7026 | } |
| 7027 | } |
| 7028 | |
| 7029 | if ((flags & IPN_TCPUDPICMP) != 0) { |
| 7030 | if (np->in_dpnext != 0) |
| 7031 | frnat.fin_data[1] = np->in_dpnext; |
| 7032 | |
| 7033 | /* |
| 7034 | * Standard port translation. Select next port. |
| 7035 | */ |
| 7036 | if ((flags & IPN_FIXEDDPORT) != 0) { |
| 7037 | np->in_stepnext = 0; |
| 7038 | } else if (np->in_stepnext == 3 && changed == -1) { |
| 7039 | np->in_dpnext++; |
| 7040 | np->in_stepnext++; |
| 7041 | changed = 3; |
| 7042 | if (np->in_dpnext > np->in_dpmax) |
| 7043 | np->in_dpnext = np->in_dpmin; |
| 7044 | } |
| 7045 | } else { |
| 7046 | if (np->in_stepnext == 3) |
| 7047 | np->in_stepnext = 0; |
| 7048 | } |
| 7049 | |
| 7050 | /* TRACE (frnat) */ |
| 7051 | |
| 7052 | /* |
| 7053 | * Here we do a lookup of the connection as seen from |
| 7054 | * the outside. If an IP# pair already exists, try |
| 7055 | * again. So if you have A->B becomes C->B, you can |
| 7056 | * also have D->E become C->E but not D->B causing |
| 7057 | * another C->B. Also take protocol and ports into |
| 7058 | * account when determining whether a pre-existing |
| 7059 | * NAT setup will cause an external conflict where |
| 7060 | * this is appropriate. |
| 7061 | * |
| 7062 | * fin_data[] is swapped around because we are doing a |
| 7063 | * lookup of the packet is if it were moving in the opposite |
| 7064 | * direction of the one we are working with now. |
| 7065 | */ |
| 7066 | if (flags & IPN_TCPUDP) { |
| 7067 | swap = frnat.fin_data[0]; |
| 7068 | frnat.fin_data[0] = frnat.fin_data[1]; |
| 7069 | frnat.fin_data[1] = swap; |
| 7070 | } |
| 7071 | if (fin->fin_out == 1) { |
| 7072 | natl = ipf_nat_inlookup(&frnat, |
| 7073 | flags & ~(SI_WILDP|NAT_SEARCH), |
| 7074 | (u_int)frnat.fin_p, |
| 7075 | frnat.fin_dst, frnat.fin_src); |
| 7076 | |
| 7077 | } else { |
| 7078 | natl = ipf_nat_outlookup(&frnat, |
| 7079 | flags & ~(SI_WILDP|NAT_SEARCH), |
| 7080 | (u_int)frnat.fin_p, |
| 7081 | frnat.fin_dst, frnat.fin_src); |
| 7082 | } |
| 7083 | if (flags & IPN_TCPUDP) { |
| 7084 | swap = frnat.fin_data[0]; |
| 7085 | frnat.fin_data[0] = frnat.fin_data[1]; |
| 7086 | frnat.fin_data[1] = swap; |
| 7087 | } |
| 7088 | |
| 7089 | /* TRACE natl, in_stepnext, l */ |
| 7090 | |
| 7091 | if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */ |
| 7092 | return -1; |
| 7093 | |
| 7094 | np->in_stepnext &= 0x3; |
| 7095 | |
| 7096 | l++; |
| 7097 | changed = -1; |
| 7098 | } while (natl != NULL); |
| 7099 | |
| 7100 | nat->nat_osrcip = fin->fin_src; |
| 7101 | nat->nat_odstip = fin->fin_dst; |
| 7102 | nat->nat_nsrcip = frnat.fin_src; |
| 7103 | nat->nat_ndstip = frnat.fin_dst; |
| 7104 | |
| 7105 | if ((flags & IPN_TCPUDP) != 0) { |
| 7106 | nat->nat_osport = htons(fin->fin_data[0]); |
| 7107 | nat->nat_odport = htons(fin->fin_data[1]); |
| 7108 | nat->nat_nsport = htons(frnat.fin_data[0]); |
| 7109 | nat->nat_ndport = htons(frnat.fin_data[1]); |
| 7110 | } else if ((flags & IPN_ICMPQUERY) != 0) { |
| 7111 | nat->nat_oicmpid = fin->fin_data[1]; |
| 7112 | nat->nat_nicmpid = frnat.fin_data[1]; |
| 7113 | } |
| 7114 | |
| 7115 | return 0; |
| 7116 | } |
| 7117 | |
| 7118 | |
| 7119 | /* ------------------------------------------------------------------------ */ |
| 7120 | /* Function: nat_newdivert */ |
| 7121 | /* Returns: int - -1 == error, 0 == success */ |
| 7122 | /* Parameters: fin(I) - pointer to packet information */ |
| 7123 | /* nat(I) - pointer to NAT entry */ |
| 7124 | /* ni(I) - pointer to structure with misc. information needed */ |
| 7125 | /* to create new NAT entry. */ |
| 7126 | /* Write Lock: ipf_nat */ |
| 7127 | /* */ |
| 7128 | /* Create a new NAT divert session as defined by the NAT rule. This is */ |
| 7129 | /* somewhat different to other NAT session creation routines because we */ |
| 7130 | /* do not iterate through either port numbers or IP addresses, searching */ |
| 7131 | /* for a unique mapping, however, a complimentary duplicate check is made. */ |
| 7132 | /* ------------------------------------------------------------------------ */ |
| 7133 | static int |
| 7134 | ipf_nat_newdivert(fr_info_t *fin, nat_t *nat, natinfo_t *nai) |
| 7135 | { |
| 7136 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 7137 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 7138 | fr_info_t frnat; |
| 7139 | ipnat_t *np; |
| 7140 | nat_t *natl; |
| 7141 | int p; |
| 7142 | |
| 7143 | np = nai->nai_np; |
| 7144 | bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); |
| 7145 | |
| 7146 | nat->nat_pr[0] = 0; |
| 7147 | nat->nat_osrcaddr = fin->fin_saddr; |
| 7148 | nat->nat_odstaddr = fin->fin_daddr; |
| 7149 | frnat.fin_saddr = htonl(np->in_snip); |
| 7150 | frnat.fin_daddr = htonl(np->in_dnip); |
| 7151 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 7152 | nat->nat_osport = htons(fin->fin_data[0]); |
| 7153 | nat->nat_odport = htons(fin->fin_data[1]); |
| 7154 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 7155 | nat->nat_oicmpid = fin->fin_data[1]; |
| 7156 | } |
| 7157 | |
| 7158 | if (np->in_redir & NAT_DIVERTUDP) { |
| 7159 | frnat.fin_data[0] = np->in_spnext; |
| 7160 | frnat.fin_data[1] = np->in_dpnext; |
| 7161 | frnat.fin_flx |= FI_TCPUDP; |
| 7162 | p = IPPROTO_UDP; |
| 7163 | } else { |
| 7164 | frnat.fin_flx &= ~FI_TCPUDP; |
| 7165 | p = IPPROTO_IPIP; |
| 7166 | } |
| 7167 | |
| 7168 | if (fin->fin_out == 1) { |
| 7169 | natl = ipf_nat_inlookup(&frnat, 0, p, |
| 7170 | frnat.fin_dst, frnat.fin_src); |
| 7171 | |
| 7172 | } else { |
| 7173 | natl = ipf_nat_outlookup(&frnat, 0, p, |
| 7174 | frnat.fin_dst, frnat.fin_src); |
| 7175 | } |
| 7176 | |
| 7177 | if (natl != NULL) { |
| 7178 | NBUMPSIDED(fin->fin_out, ns_divert_exist); |
| 7179 | return -1; |
| 7180 | } |
| 7181 | |
| 7182 | nat->nat_nsrcaddr = frnat.fin_saddr; |
| 7183 | nat->nat_ndstaddr = frnat.fin_daddr; |
| 7184 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 7185 | nat->nat_nsport = htons(frnat.fin_data[0]); |
| 7186 | nat->nat_ndport = htons(frnat.fin_data[1]); |
| 7187 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 7188 | nat->nat_nicmpid = frnat.fin_data[1]; |
| 7189 | } |
| 7190 | |
| 7191 | nat->nat_pr[fin->fin_out] = fin->fin_p; |
| 7192 | nat->nat_pr[1 - fin->fin_out] = p; |
| 7193 | |
| 7194 | if (np->in_redir & NAT_REDIRECT) |
| 7195 | nat->nat_dir = NAT_DIVERTIN; |
| 7196 | else |
| 7197 | nat->nat_dir = NAT_DIVERTOUT; |
| 7198 | |
| 7199 | return 0; |
| 7200 | } |
| 7201 | |
| 7202 | |
| 7203 | /* ------------------------------------------------------------------------ */ |
| 7204 | /* Function: nat_builddivertmp */ |
| 7205 | /* Returns: int - -1 == error, 0 == success */ |
| 7206 | /* Parameters: softn(I) - pointer to NAT context structure */ |
| 7207 | /* np(I) - pointer to a NAT rule */ |
| 7208 | /* */ |
| 7209 | /* For divert rules, a skeleton packet representing what will be prepended */ |
| 7210 | /* to the real packet is created. Even though we don't have the full */ |
| 7211 | /* packet here, a checksum is calculated that we update later when we */ |
| 7212 | /* fill in the final details. At present a 0 checksum for UDP is being set */ |
| 7213 | /* here because it is expected that divert will be used for localhost. */ |
| 7214 | /* ------------------------------------------------------------------------ */ |
| 7215 | static int |
| 7216 | ipf_nat_builddivertmp(ipf_nat_softc_t *softn, ipnat_t *np) |
| 7217 | { |
| 7218 | udphdr_t *uh; |
| 7219 | size_t len; |
| 7220 | ip_t *ip; |
| 7221 | |
| 7222 | if ((np->in_redir & NAT_DIVERTUDP) != 0) |
| 7223 | len = sizeof(ip_t) + sizeof(udphdr_t); |
| 7224 | else |
| 7225 | len = sizeof(ip_t); |
| 7226 | |
| 7227 | ALLOC_MB_T(np->in_divmp, len); |
| 7228 | if (np->in_divmp == NULL) { |
| 7229 | NBUMPD(ipf_nat_stats, ns_divert_build); |
| 7230 | return -1; |
| 7231 | } |
| 7232 | |
| 7233 | /* |
| 7234 | * First, the header to get the packet diverted to the new destination |
| 7235 | */ |
| 7236 | ip = MTOD(np->in_divmp, ip_t *); |
| 7237 | IP_V_A(ip, 4); |
| 7238 | IP_HL_A(ip, 5); |
| 7239 | ip->ip_tos = 0; |
| 7240 | if ((np->in_redir & NAT_DIVERTUDP) != 0) |
| 7241 | ip->ip_p = IPPROTO_UDP; |
| 7242 | else |
| 7243 | ip->ip_p = IPPROTO_IPIP; |
| 7244 | ip->ip_ttl = 255; |
| 7245 | ip->ip_off = 0; |
| 7246 | ip->ip_sum = 0; |
| 7247 | ip->ip_len = htons(len); |
| 7248 | ip->ip_id = 0; |
| 7249 | ip->ip_src.s_addr = htonl(np->in_snip); |
| 7250 | ip->ip_dst.s_addr = htonl(np->in_dnip); |
| 7251 | ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip)); |
| 7252 | |
| 7253 | if (np->in_redir & NAT_DIVERTUDP) { |
| 7254 | uh = (udphdr_t *)(ip + 1); |
| 7255 | uh->uh_sum = 0; |
| 7256 | uh->uh_ulen = 8; |
| 7257 | uh->uh_sport = htons(np->in_spnext); |
| 7258 | uh->uh_dport = htons(np->in_dpnext); |
| 7259 | } |
| 7260 | |
| 7261 | return 0; |
| 7262 | } |
| 7263 | |
| 7264 | |
| 7265 | #define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t)) |
| 7266 | |
| 7267 | /* ------------------------------------------------------------------------ */ |
| 7268 | /* Function: nat_decap */ |
| 7269 | /* Returns: int - -1 == error, 0 == success */ |
| 7270 | /* Parameters: fin(I) - pointer to packet information */ |
| 7271 | /* nat(I) - pointer to current NAT session */ |
| 7272 | /* */ |
| 7273 | /* This function is responsible for undoing a packet's encapsulation in the */ |
| 7274 | /* reverse of an encap/divert rule. After removing the outer encapsulation */ |
| 7275 | /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/ |
| 7276 | /* match the "new" packet as it may still be used by IPFilter elsewhere. */ |
| 7277 | /* We use "dir" here as the basis for some of the expectations about the */ |
| 7278 | /* outer header. If we return an error, the goal is to leave the original */ |
| 7279 | /* packet information undisturbed - this falls short at the end where we'd */ |
| 7280 | /* need to back a backup copy of "fin" - expensive. */ |
| 7281 | /* ------------------------------------------------------------------------ */ |
| 7282 | static int |
| 7283 | ipf_nat_decap(fr_info_t *fin, nat_t *nat) |
| 7284 | { |
| 7285 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 7286 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 7287 | char *hdr; |
| 7288 | int hlen; |
| 7289 | int skip; |
| 7290 | mb_t *m; |
| 7291 | |
| 7292 | if ((fin->fin_flx & FI_ICMPERR) != 0) { |
| 7293 | /* |
| 7294 | * ICMP packets don't get decapsulated, instead what we need |
| 7295 | * to do is change the ICMP reply from including (in the data |
| 7296 | * portion for errors) the encapsulated packet that we sent |
| 7297 | * out to something that resembles the original packet prior |
| 7298 | * to encapsulation. This isn't done here - all we're doing |
| 7299 | * here is changing the outer address to ensure that it gets |
| 7300 | * targetted back to the correct system. |
| 7301 | */ |
| 7302 | |
| 7303 | if (nat->nat_dir & NAT_OUTBOUND) { |
| 7304 | u_32_t sum1, sum2, sumd; |
| 7305 | |
| 7306 | sum1 = ntohl(fin->fin_daddr); |
| 7307 | sum2 = ntohl(nat->nat_osrcaddr); |
| 7308 | CALC_SUMD(sum1, sum2, sumd); |
| 7309 | fin->fin_ip->ip_dst = nat->nat_osrcip; |
| 7310 | fin->fin_daddr = nat->nat_osrcaddr; |
| 7311 | #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ |
| 7312 | defined(__osf__) || defined(linux) |
| 7313 | ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0); |
| 7314 | #endif |
| 7315 | } |
| 7316 | return 0; |
| 7317 | } |
| 7318 | |
| 7319 | m = fin->fin_m; |
| 7320 | skip = fin->fin_hlen; |
| 7321 | |
| 7322 | switch (nat->nat_dir) |
| 7323 | { |
| 7324 | case NAT_DIVERTIN : |
| 7325 | case NAT_DIVERTOUT : |
| 7326 | if (fin->fin_plen < MINDECAP) |
| 7327 | return -1; |
| 7328 | skip += sizeof(udphdr_t); |
| 7329 | break; |
| 7330 | |
| 7331 | case NAT_ENCAPIN : |
| 7332 | case NAT_ENCAPOUT : |
| 7333 | if (fin->fin_plen < (skip + sizeof(ip_t))) |
| 7334 | return -1; |
| 7335 | break; |
| 7336 | default : |
| 7337 | return -1; |
| 7338 | /* NOTREACHED */ |
| 7339 | } |
| 7340 | |
| 7341 | /* |
| 7342 | * The aim here is to keep the original packet details in "fin" for |
| 7343 | * as long as possible so that returning with an error is for the |
| 7344 | * original packet and there is little undoing work to do. |
| 7345 | */ |
| 7346 | if (M_LEN(m) < skip + sizeof(ip_t)) { |
| 7347 | if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1) |
| 7348 | return -1; |
| 7349 | } |
| 7350 | |
| 7351 | hdr = MTOD(fin->fin_m, char *); |
| 7352 | fin->fin_ip = (ip_t *)(hdr + skip); |
| 7353 | hlen = IP_HL(fin->fin_ip) << 2; |
| 7354 | |
| 7355 | if (ipf_pr_pullup(fin, skip + hlen) == -1) { |
| 7356 | NBUMPSIDED(fin->fin_out, ns_decap_pullup); |
| 7357 | return -1; |
| 7358 | } |
| 7359 | |
| 7360 | fin->fin_hlen = hlen; |
| 7361 | fin->fin_dlen -= skip; |
| 7362 | fin->fin_plen -= skip; |
| 7363 | fin->fin_ipoff += skip; |
| 7364 | |
| 7365 | if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) { |
| 7366 | NBUMPSIDED(fin->fin_out, ns_decap_bad); |
| 7367 | return -1; |
| 7368 | } |
| 7369 | |
| 7370 | return skip; |
| 7371 | } |
| 7372 | |
| 7373 | |
| 7374 | /* ------------------------------------------------------------------------ */ |
| 7375 | /* Function: nat_nextaddr */ |
| 7376 | /* Returns: int - -1 == bad input (no new address), */ |
| 7377 | /* 0 == success and dst has new address */ |
| 7378 | /* Parameters: fin(I) - pointer to packet information */ |
| 7379 | /* na(I) - how to generate new address */ |
| 7380 | /* old(I) - original address being replaced */ |
| 7381 | /* dst(O) - where to put the new address */ |
| 7382 | /* Write Lock: ipf_nat */ |
| 7383 | /* */ |
| 7384 | /* This function uses the contents of the "na" structure, in combination */ |
| 7385 | /* with "old" to produce a new address to store in "dst". Not all of the */ |
| 7386 | /* possible uses of "na" will result in a new address. */ |
| 7387 | /* ------------------------------------------------------------------------ */ |
| 7388 | static int |
| 7389 | ipf_nat_nextaddr(fr_info_t *fin, nat_addr_t *na, u_32_t *old, u_32_t *dst) |
| 7390 | { |
| 7391 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 7392 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 7393 | u_32_t amin, amax, new; |
| 7394 | i6addr_t newip; |
| 7395 | int error; |
| 7396 | |
| 7397 | new = 0; |
| 7398 | amin = na->na_addr[0].in4.s_addr; |
| 7399 | |
| 7400 | switch (na->na_atype) |
| 7401 | { |
| 7402 | case FRI_RANGE : |
| 7403 | amax = na->na_addr[1].in4.s_addr; |
| 7404 | break; |
| 7405 | |
| 7406 | case FRI_NETMASKED : |
| 7407 | case FRI_DYNAMIC : |
| 7408 | case FRI_NORMAL : |
| 7409 | /* |
| 7410 | * Compute the maximum address by adding the inverse of the |
| 7411 | * netmask to the minimum address. |
| 7412 | */ |
| 7413 | amax = ~na->na_addr[1].in4.s_addr; |
| 7414 | amax |= amin; |
| 7415 | break; |
| 7416 | |
| 7417 | case FRI_LOOKUP : |
| 7418 | break; |
| 7419 | |
| 7420 | case FRI_BROADCAST : |
| 7421 | case FRI_PEERADDR : |
| 7422 | case FRI_NETWORK : |
| 7423 | default : |
| 7424 | return -1; |
| 7425 | } |
| 7426 | |
| 7427 | error = -1; |
| 7428 | |
| 7429 | if (na->na_atype == FRI_LOOKUP) { |
| 7430 | if (na->na_type == IPLT_DSTLIST) { |
| 7431 | error = ipf_dstlist_select_node(fin, na->na_ptr, dst, |
| 7432 | NULL); |
| 7433 | } else { |
| 7434 | NBUMPSIDE(fin->fin_out, ns_badnextaddr); |
| 7435 | } |
| 7436 | |
| 7437 | } else if (na->na_atype == IPLT_NONE) { |
| 7438 | /* |
| 7439 | * 0/0 as the new address means leave it alone. |
| 7440 | */ |
| 7441 | if (na->na_addr[0].in4.s_addr == 0 && |
| 7442 | na->na_addr[1].in4.s_addr == 0) { |
| 7443 | new = *old; |
| 7444 | |
| 7445 | /* |
| 7446 | * 0/32 means get the interface's address |
| 7447 | */ |
| 7448 | } else if (na->na_addr[0].in4.s_addr == 0 && |
| 7449 | na->na_addr[1].in4.s_addr == 0xffffffff) { |
| 7450 | if (ipf_ifpaddr(softc, 4, na->na_atype, |
| 7451 | fin->fin_ifp, &newip, NULL) == -1) { |
| 7452 | NBUMPSIDED(fin->fin_out, ns_ifpaddrfail); |
| 7453 | return -1; |
| 7454 | } |
| 7455 | new = newip.in4.s_addr; |
| 7456 | } else { |
| 7457 | new = htonl(na->na_nextip); |
| 7458 | } |
| 7459 | *dst = new; |
| 7460 | error = 0; |
| 7461 | |
| 7462 | } else { |
| 7463 | NBUMPSIDE(fin->fin_out, ns_badnextaddr); |
| 7464 | } |
| 7465 | |
| 7466 | return error; |
| 7467 | } |
| 7468 | |
| 7469 | |
| 7470 | /* ------------------------------------------------------------------------ */ |
| 7471 | /* Function: nat_nextaddrinit */ |
| 7472 | /* Returns: int - 0 == success, else error number */ |
| 7473 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 7474 | /* na(I) - NAT address information for generating new addr*/ |
| 7475 | /* initial(I) - flag indicating if it is the first call for */ |
| 7476 | /* this "na" structure. */ |
| 7477 | /* ifp(I) - network interface to derive address */ |
| 7478 | /* information from. */ |
| 7479 | /* */ |
| 7480 | /* This function is expected to be called in two scenarious: when a new NAT */ |
| 7481 | /* rule is loaded into the kernel and when the list of NAT rules is sync'd */ |
| 7482 | /* up with the valid network interfaces (possibly due to them changing.) */ |
| 7483 | /* To distinguish between these, the "initial" parameter is used. If it is */ |
| 7484 | /* 1 then this indicates the rule has just been reloaded and 0 for when we */ |
| 7485 | /* are updating information. This difference is important because in */ |
| 7486 | /* instances where we are not updating address information associated with */ |
| 7487 | /* a network interface, we don't want to disturb what the "next" address to */ |
| 7488 | /* come out of ipf_nat_nextaddr() will be. */ |
| 7489 | /* ------------------------------------------------------------------------ */ |
| 7490 | static int |
| 7491 | ipf_nat_nextaddrinit(ipf_main_softc_t *softc, char *base, nat_addr_t *na, |
| 7492 | int initial, void *ifp) |
| 7493 | { |
| 7494 | |
| 7495 | switch (na->na_atype) |
| 7496 | { |
| 7497 | case FRI_LOOKUP : |
| 7498 | if (na->na_subtype == 0) { |
| 7499 | na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT, |
| 7500 | na->na_type, |
| 7501 | na->na_num, |
| 7502 | &na->na_func); |
| 7503 | } else if (na->na_subtype == 1) { |
| 7504 | na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT, |
| 7505 | na->na_type, |
| 7506 | base + na->na_num, |
| 7507 | &na->na_func); |
| 7508 | } |
| 7509 | if (na->na_func == NULL) { |
| 7510 | IPFERROR(60060); |
| 7511 | return ESRCH; |
| 7512 | } |
| 7513 | if (na->na_ptr == NULL) { |
| 7514 | IPFERROR(60056); |
| 7515 | return ESRCH; |
| 7516 | } |
| 7517 | break; |
| 7518 | |
| 7519 | case FRI_DYNAMIC : |
| 7520 | case FRI_BROADCAST : |
| 7521 | case FRI_NETWORK : |
| 7522 | case FRI_NETMASKED : |
| 7523 | case FRI_PEERADDR : |
| 7524 | if (ifp != NULL) |
| 7525 | (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp, |
| 7526 | &na->na_addr[0], &na->na_addr[1]); |
| 7527 | break; |
| 7528 | |
| 7529 | case FRI_SPLIT : |
| 7530 | case FRI_RANGE : |
| 7531 | if (initial) |
| 7532 | na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); |
| 7533 | break; |
| 7534 | |
| 7535 | case FRI_NONE : |
| 7536 | na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; |
| 7537 | return 0; |
| 7538 | |
| 7539 | case FRI_NORMAL : |
| 7540 | na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; |
| 7541 | break; |
| 7542 | |
| 7543 | default : |
| 7544 | IPFERROR(60054); |
| 7545 | return EINVAL; |
| 7546 | } |
| 7547 | |
| 7548 | if (initial && (na->na_atype == FRI_NORMAL)) { |
| 7549 | if (na->na_addr[0].in4.s_addr == 0) { |
| 7550 | if ((na->na_addr[1].in4.s_addr == 0xffffffff) || |
| 7551 | (na->na_addr[1].in4.s_addr == 0)) { |
| 7552 | return 0; |
| 7553 | } |
| 7554 | } |
| 7555 | |
| 7556 | if (na->na_addr[1].in4.s_addr == 0xffffffff) { |
| 7557 | na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); |
| 7558 | } else { |
| 7559 | na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1; |
| 7560 | } |
| 7561 | } |
| 7562 | |
| 7563 | return 0; |
| 7564 | } |
| 7565 | |
| 7566 | |
| 7567 | /* ------------------------------------------------------------------------ */ |
| 7568 | /* Function: ipf_nat_matchflush */ |
| 7569 | /* Returns: int - -1 == error, 0 == success */ |
| 7570 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 7571 | /* softn(I) - pointer to NAT context structure */ |
| 7572 | /* nat(I) - pointer to current NAT session */ |
| 7573 | /* */ |
| 7574 | /* ------------------------------------------------------------------------ */ |
| 7575 | static int |
| 7576 | ipf_nat_matchflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, void *data) |
| 7577 | { |
| 7578 | int *array, flushed, error; |
| 7579 | nat_t *nat, *natnext; |
| 7580 | ipfobj_t obj; |
| 7581 | |
| 7582 | error = ipf_matcharray_load(softc, data, &obj, &array); |
| 7583 | if (error != 0) |
| 7584 | return error; |
| 7585 | |
| 7586 | flushed = 0; |
| 7587 | |
| 7588 | for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) { |
| 7589 | natnext = nat->nat_next; |
| 7590 | if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) { |
| 7591 | ipf_nat_delete(softc, nat, NL_FLUSH); |
| 7592 | flushed++; |
| 7593 | } |
| 7594 | } |
| 7595 | |
| 7596 | obj.ipfo_retval = flushed; |
| 7597 | error = BCOPYOUT(&obj, data, sizeof(obj)); |
| 7598 | |
| 7599 | KFREES(array, array[0] * sizeof(*array)); |
| 7600 | |
| 7601 | return error; |
| 7602 | } |
| 7603 | |
| 7604 | |
| 7605 | /* ------------------------------------------------------------------------ */ |
| 7606 | /* Function: ipf_nat_matcharray */ |
| 7607 | /* Returns: int - -1 == error, 0 == success */ |
| 7608 | /* Parameters: fin(I) - pointer to packet information */ |
| 7609 | /* nat(I) - pointer to current NAT session */ |
| 7610 | /* */ |
| 7611 | /* ------------------------------------------------------------------------ */ |
| 7612 | static int |
| 7613 | ipf_nat_matcharray(nat_t *nat, int *array, u_long ticks) |
| 7614 | { |
| 7615 | int i, n, *x, e, p; |
| 7616 | |
| 7617 | e = 0; |
| 7618 | n = array[0]; |
| 7619 | x = array + 1; |
| 7620 | |
| 7621 | for (; n > 0; x += 3 + x[2]) { |
| 7622 | if (x[0] == IPF_EXP_END) |
| 7623 | break; |
| 7624 | e = 0; |
| 7625 | |
| 7626 | n -= x[2] + 3; |
| 7627 | if (n < 0) |
| 7628 | break; |
| 7629 | |
| 7630 | p = x[0] >> 16; |
| 7631 | if (p != 0 && p != nat->nat_pr[1]) |
| 7632 | break; |
| 7633 | |
| 7634 | switch (x[0]) |
| 7635 | { |
| 7636 | case IPF_EXP_IP_PR : |
| 7637 | for (i = 0; !e && i < x[2]; i++) { |
| 7638 | e |= (nat->nat_pr[1] == x[i + 3]); |
| 7639 | } |
| 7640 | break; |
| 7641 | |
| 7642 | case IPF_EXP_IP_SRCADDR : |
| 7643 | if (nat->nat_v[0] == 4) { |
| 7644 | for (i = 0; !e && i < x[2]; i++) { |
| 7645 | e |= ((nat->nat_osrcaddr & x[i + 4]) == |
| 7646 | x[i + 3]); |
| 7647 | } |
| 7648 | } |
| 7649 | if (nat->nat_v[1] == 4) { |
| 7650 | for (i = 0; !e && i < x[2]; i++) { |
| 7651 | e |= ((nat->nat_nsrcaddr & x[i + 4]) == |
| 7652 | x[i + 3]); |
| 7653 | } |
| 7654 | } |
| 7655 | break; |
| 7656 | |
| 7657 | case IPF_EXP_IP_DSTADDR : |
| 7658 | if (nat->nat_v[0] == 4) { |
| 7659 | for (i = 0; !e && i < x[2]; i++) { |
| 7660 | e |= ((nat->nat_odstaddr & x[i + 4]) == |
| 7661 | x[i + 3]); |
| 7662 | } |
| 7663 | } |
| 7664 | if (nat->nat_v[1] == 4) { |
| 7665 | for (i = 0; !e && i < x[2]; i++) { |
| 7666 | e |= ((nat->nat_ndstaddr & x[i + 4]) == |
| 7667 | x[i + 3]); |
| 7668 | } |
| 7669 | } |
| 7670 | break; |
| 7671 | |
| 7672 | case IPF_EXP_IP_ADDR : |
| 7673 | for (i = 0; !e && i < x[2]; i++) { |
| 7674 | if (nat->nat_v[0] == 4) { |
| 7675 | e |= ((nat->nat_osrcaddr & x[i + 4]) == |
| 7676 | x[i + 3]); |
| 7677 | } |
| 7678 | if (nat->nat_v[1] == 4) { |
| 7679 | e |= ((nat->nat_nsrcaddr & x[i + 4]) == |
| 7680 | x[i + 3]); |
| 7681 | } |
| 7682 | if (nat->nat_v[0] == 4) { |
| 7683 | e |= ((nat->nat_odstaddr & x[i + 4]) == |
| 7684 | x[i + 3]); |
| 7685 | } |
| 7686 | if (nat->nat_v[1] == 4) { |
| 7687 | e |= ((nat->nat_ndstaddr & x[i + 4]) == |
| 7688 | x[i + 3]); |
| 7689 | } |
| 7690 | } |
| 7691 | break; |
| 7692 | |
| 7693 | #ifdef USE_INET6 |
| 7694 | case IPF_EXP_IP6_SRCADDR : |
| 7695 | if (nat->nat_v[0] == 6) { |
| 7696 | for (i = 0; !e && i < x[3]; i++) { |
| 7697 | e |= IP6_MASKEQ(&nat->nat_osrc6, |
| 7698 | x + i + 7, x + i + 3); |
| 7699 | } |
| 7700 | } |
| 7701 | if (nat->nat_v[1] == 6) { |
| 7702 | for (i = 0; !e && i < x[3]; i++) { |
| 7703 | e |= IP6_MASKEQ(&nat->nat_nsrc6, |
| 7704 | x + i + 7, x + i + 3); |
| 7705 | } |
| 7706 | } |
| 7707 | break; |
| 7708 | |
| 7709 | case IPF_EXP_IP6_DSTADDR : |
| 7710 | if (nat->nat_v[0] == 6) { |
| 7711 | for (i = 0; !e && i < x[3]; i++) { |
| 7712 | e |= IP6_MASKEQ(&nat->nat_odst6, |
| 7713 | x + i + 7, |
| 7714 | x + i + 3); |
| 7715 | } |
| 7716 | } |
| 7717 | if (nat->nat_v[1] == 6) { |
| 7718 | for (i = 0; !e && i < x[3]; i++) { |
| 7719 | e |= IP6_MASKEQ(&nat->nat_ndst6, |
| 7720 | x + i + 7, |
| 7721 | x + i + 3); |
| 7722 | } |
| 7723 | } |
| 7724 | break; |
| 7725 | |
| 7726 | case IPF_EXP_IP6_ADDR : |
| 7727 | for (i = 0; !e && i < x[3]; i++) { |
| 7728 | if (nat->nat_v[0] == 6) { |
| 7729 | e |= IP6_MASKEQ(&nat->nat_osrc6, |
| 7730 | x + i + 7, |
| 7731 | x + i + 3); |
| 7732 | } |
| 7733 | if (nat->nat_v[0] == 6) { |
| 7734 | e |= IP6_MASKEQ(&nat->nat_odst6, |
| 7735 | x + i + 7, |
| 7736 | x + i + 3); |
| 7737 | } |
| 7738 | if (nat->nat_v[1] == 6) { |
| 7739 | e |= IP6_MASKEQ(&nat->nat_nsrc6, |
| 7740 | x + i + 7, |
| 7741 | x + i + 3); |
| 7742 | } |
| 7743 | if (nat->nat_v[1] == 6) { |
| 7744 | e |= IP6_MASKEQ(&nat->nat_ndst6, |
| 7745 | x + i + 7, |
| 7746 | x + i + 3); |
| 7747 | } |
| 7748 | } |
| 7749 | break; |
| 7750 | #endif |
| 7751 | |
| 7752 | case IPF_EXP_UDP_PORT : |
| 7753 | case IPF_EXP_TCP_PORT : |
| 7754 | for (i = 0; !e && i < x[2]; i++) { |
| 7755 | e |= (nat->nat_nsport == x[i + 3]) || |
| 7756 | (nat->nat_ndport == x[i + 3]); |
| 7757 | } |
| 7758 | break; |
| 7759 | |
| 7760 | case IPF_EXP_UDP_SPORT : |
| 7761 | case IPF_EXP_TCP_SPORT : |
| 7762 | for (i = 0; !e && i < x[2]; i++) { |
| 7763 | e |= (nat->nat_nsport == x[i + 3]); |
| 7764 | } |
| 7765 | break; |
| 7766 | |
| 7767 | case IPF_EXP_UDP_DPORT : |
| 7768 | case IPF_EXP_TCP_DPORT : |
| 7769 | for (i = 0; !e && i < x[2]; i++) { |
| 7770 | e |= (nat->nat_ndport == x[i + 3]); |
| 7771 | } |
| 7772 | break; |
| 7773 | |
| 7774 | case IPF_EXP_TCP_STATE : |
| 7775 | for (i = 0; !e && i < x[2]; i++) { |
| 7776 | e |= (nat->nat_tcpstate[0] == x[i + 3]) || |
| 7777 | (nat->nat_tcpstate[1] == x[i + 3]); |
| 7778 | } |
| 7779 | break; |
| 7780 | |
| 7781 | case IPF_EXP_IDLE_GT : |
| 7782 | e |= (ticks - nat->nat_touched > x[3]); |
| 7783 | break; |
| 7784 | } |
| 7785 | e ^= x[1]; |
| 7786 | |
| 7787 | if (!e) |
| 7788 | break; |
| 7789 | } |
| 7790 | |
| 7791 | return e; |
| 7792 | } |
| 7793 | |
| 7794 | |
| 7795 | /* ------------------------------------------------------------------------ */ |
| 7796 | /* Function: ipf_nat_gettable */ |
| 7797 | /* Returns: int - 0 = success, else error */ |
| 7798 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 7799 | /* softn(I) - pointer to NAT context structure */ |
| 7800 | /* data(I) - pointer to ioctl data */ |
| 7801 | /* */ |
| 7802 | /* This function handles ioctl requests for tables of nat information. */ |
| 7803 | /* At present the only table it deals with is the hash bucket statistics. */ |
| 7804 | /* ------------------------------------------------------------------------ */ |
| 7805 | static int |
| 7806 | ipf_nat_gettable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, char *data) |
| 7807 | { |
| 7808 | ipftable_t table; |
| 7809 | int error; |
| 7810 | |
| 7811 | error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE); |
| 7812 | if (error != 0) |
| 7813 | return error; |
| 7814 | |
| 7815 | switch (table.ita_type) |
| 7816 | { |
| 7817 | case IPFTABLE_BUCKETS_NATIN : |
| 7818 | error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, |
| 7819 | table.ita_table, |
| 7820 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 7821 | break; |
| 7822 | |
| 7823 | case IPFTABLE_BUCKETS_NATOUT : |
| 7824 | error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, |
| 7825 | table.ita_table, |
| 7826 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 7827 | break; |
| 7828 | |
| 7829 | default : |
| 7830 | IPFERROR(60058); |
| 7831 | return EINVAL; |
| 7832 | } |
| 7833 | |
| 7834 | if (error != 0) { |
| 7835 | IPFERROR(60059); |
| 7836 | error = EFAULT; |
| 7837 | } |
| 7838 | return error; |
| 7839 | } |
| 7840 | |
| 7841 | |
| 7842 | /* ------------------------------------------------------------------------ */ |
| 7843 | /* Function: ipf_nat_settimeout */ |
| 7844 | /* Returns: int - 0 = success, else failure */ |
| 7845 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 7846 | /* t(I) - pointer to tunable */ |
| 7847 | /* p(I) - pointer to new tuning data */ |
| 7848 | /* */ |
| 7849 | /* Apply the timeout change to the NAT timeout queues. */ |
| 7850 | /* ------------------------------------------------------------------------ */ |
| 7851 | int |
| 7852 | ipf_nat_settimeout(struct ipf_main_softc_s *softc, ipftuneable_t *t, |
| 7853 | ipftuneval_t *p) |
| 7854 | { |
| 7855 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 7856 | |
| 7857 | if (!strncmp(t->ipft_name, "tcp_" , 4)) |
| 7858 | return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq); |
| 7859 | |
| 7860 | if (!strcmp(t->ipft_name, "udp_timeout" )) { |
| 7861 | ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int); |
| 7862 | } else if (!strcmp(t->ipft_name, "udp_ack_timeout" )) { |
| 7863 | ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int); |
| 7864 | } else if (!strcmp(t->ipft_name, "icmp_timeout" )) { |
| 7865 | ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int); |
| 7866 | } else if (!strcmp(t->ipft_name, "icmp_ack_timeout" )) { |
| 7867 | ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int); |
| 7868 | } else if (!strcmp(t->ipft_name, "ip_timeout" )) { |
| 7869 | ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int); |
| 7870 | } else { |
| 7871 | IPFERROR(60062); |
| 7872 | return ESRCH; |
| 7873 | } |
| 7874 | return 0; |
| 7875 | } |
| 7876 | |
| 7877 | |
| 7878 | /* ------------------------------------------------------------------------ */ |
| 7879 | /* Function: ipf_nat_rehash */ |
| 7880 | /* Returns: int - 0 = success, else failure */ |
| 7881 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 7882 | /* t(I) - pointer to tunable */ |
| 7883 | /* p(I) - pointer to new tuning data */ |
| 7884 | /* */ |
| 7885 | /* To change the size of the basic NAT table, we need to first allocate the */ |
| 7886 | /* new tables (lest it fails and we've got nowhere to store all of the NAT */ |
| 7887 | /* sessions currently active) and then walk through the entire list and */ |
| 7888 | /* insert them into the table. There are two tables here: an inbound one */ |
| 7889 | /* and an outbound one. Each NAT entry goes into each table once. */ |
| 7890 | /* ------------------------------------------------------------------------ */ |
| 7891 | int |
| 7892 | ipf_nat_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) |
| 7893 | { |
| 7894 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 7895 | nat_t **newtab[2], *nat, **natp; |
| 7896 | u_int *bucketlens[2]; |
| 7897 | u_int maxbucket; |
| 7898 | u_int newsize; |
| 7899 | int error; |
| 7900 | u_int hv; |
| 7901 | int i; |
| 7902 | |
| 7903 | newsize = p->ipftu_int; |
| 7904 | /* |
| 7905 | * In case there is nothing to do... |
| 7906 | */ |
| 7907 | if (newsize == softn->ipf_nat_table_sz) |
| 7908 | return 0; |
| 7909 | |
| 7910 | newtab[0] = NULL; |
| 7911 | newtab[1] = NULL; |
| 7912 | bucketlens[0] = NULL; |
| 7913 | bucketlens[1] = NULL; |
| 7914 | /* |
| 7915 | * 4 tables depend on the NAT table size: the inbound looking table, |
| 7916 | * the outbound lookup table and the hash chain length for each. |
| 7917 | */ |
| 7918 | KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *)); |
| 7919 | if (newtab[0] == NULL) { |
| 7920 | error = 60063; |
| 7921 | goto badrehash; |
| 7922 | } |
| 7923 | |
| 7924 | KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *)); |
| 7925 | if (newtab[1] == NULL) { |
| 7926 | error = 60064; |
| 7927 | goto badrehash; |
| 7928 | } |
| 7929 | |
| 7930 | KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int)); |
| 7931 | if (bucketlens[0] == NULL) { |
| 7932 | error = 60065; |
| 7933 | goto badrehash; |
| 7934 | } |
| 7935 | |
| 7936 | KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int)); |
| 7937 | if (bucketlens[1] == NULL) { |
| 7938 | error = 60066; |
| 7939 | goto badrehash; |
| 7940 | } |
| 7941 | |
| 7942 | /* |
| 7943 | * Recalculate the maximum length based on the new size. |
| 7944 | */ |
| 7945 | for (maxbucket = 0, i = newsize; i > 0; i >>= 1) |
| 7946 | maxbucket++; |
| 7947 | maxbucket *= 2; |
| 7948 | |
| 7949 | bzero((char *)newtab[0], newsize * sizeof(nat_t *)); |
| 7950 | bzero((char *)newtab[1], newsize * sizeof(nat_t *)); |
| 7951 | bzero((char *)bucketlens[0], newsize * sizeof(u_int)); |
| 7952 | bzero((char *)bucketlens[1], newsize * sizeof(u_int)); |
| 7953 | |
| 7954 | WRITE_ENTER(&softc->ipf_nat); |
| 7955 | |
| 7956 | if (softn->ipf_nat_table[0] != NULL) { |
| 7957 | KFREES(softn->ipf_nat_table[0], |
| 7958 | softn->ipf_nat_table_sz * |
| 7959 | sizeof(*softn->ipf_nat_table[0])); |
| 7960 | } |
| 7961 | softn->ipf_nat_table[0] = newtab[0]; |
| 7962 | |
| 7963 | if (softn->ipf_nat_table[1] != NULL) { |
| 7964 | KFREES(softn->ipf_nat_table[1], |
| 7965 | softn->ipf_nat_table_sz * |
| 7966 | sizeof(*softn->ipf_nat_table[1])); |
| 7967 | } |
| 7968 | softn->ipf_nat_table[1] = newtab[1]; |
| 7969 | |
| 7970 | if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { |
| 7971 | KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, |
| 7972 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 7973 | } |
| 7974 | softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0]; |
| 7975 | |
| 7976 | if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { |
| 7977 | KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, |
| 7978 | softn->ipf_nat_table_sz * sizeof(u_int)); |
| 7979 | } |
| 7980 | softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1]; |
| 7981 | |
| 7982 | softn->ipf_nat_maxbucket = maxbucket; |
| 7983 | softn->ipf_nat_table_sz = newsize; |
| 7984 | /* |
| 7985 | * Walk through the entire list of NAT table entries and put them |
| 7986 | * in the new NAT table, somewhere. Because we have a new table, |
| 7987 | * we need to restart the counter of how many chains are in use. |
| 7988 | */ |
| 7989 | softn->ipf_nat_stats.ns_side[0].ns_inuse = 0; |
| 7990 | softn->ipf_nat_stats.ns_side[1].ns_inuse = 0; |
| 7991 | |
| 7992 | for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) { |
| 7993 | nat->nat_hnext[0] = NULL; |
| 7994 | nat->nat_phnext[0] = NULL; |
| 7995 | hv = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 7996 | |
| 7997 | natp = &softn->ipf_nat_table[0][hv]; |
| 7998 | if (*natp) { |
| 7999 | (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; |
| 8000 | } else { |
| 8001 | NBUMPSIDE(0, ns_inuse); |
| 8002 | } |
| 8003 | nat->nat_phnext[0] = natp; |
| 8004 | nat->nat_hnext[0] = *natp; |
| 8005 | *natp = nat; |
| 8006 | NBUMPSIDE(0, ns_bucketlen[hv]); |
| 8007 | |
| 8008 | nat->nat_hnext[1] = NULL; |
| 8009 | nat->nat_phnext[1] = NULL; |
| 8010 | hv = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 8011 | |
| 8012 | natp = &softn->ipf_nat_table[1][hv]; |
| 8013 | if (*natp) { |
| 8014 | (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; |
| 8015 | } else { |
| 8016 | NBUMPSIDE(1, ns_inuse); |
| 8017 | } |
| 8018 | nat->nat_phnext[1] = natp; |
| 8019 | nat->nat_hnext[1] = *natp; |
| 8020 | *natp = nat; |
| 8021 | NBUMPSIDE(1, ns_bucketlen[hv]); |
| 8022 | } |
| 8023 | RWLOCK_EXIT(&softc->ipf_nat); |
| 8024 | |
| 8025 | return 0; |
| 8026 | |
| 8027 | badrehash: |
| 8028 | if (bucketlens[1] != NULL) { |
| 8029 | KFREES(bucketlens[0], newsize * sizeof(u_int)); |
| 8030 | } |
| 8031 | if (bucketlens[0] != NULL) { |
| 8032 | KFREES(bucketlens[0], newsize * sizeof(u_int)); |
| 8033 | } |
| 8034 | if (newtab[0] != NULL) { |
| 8035 | KFREES(newtab[0], newsize * sizeof(nat_t *)); |
| 8036 | } |
| 8037 | if (newtab[1] != NULL) { |
| 8038 | KFREES(newtab[1], newsize * sizeof(nat_t *)); |
| 8039 | } |
| 8040 | IPFERROR(error); |
| 8041 | return ENOMEM; |
| 8042 | } |
| 8043 | |
| 8044 | |
| 8045 | /* ------------------------------------------------------------------------ */ |
| 8046 | /* Function: ipf_nat_rehash_rules */ |
| 8047 | /* Returns: int - 0 = success, else failure */ |
| 8048 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 8049 | /* t(I) - pointer to tunable */ |
| 8050 | /* p(I) - pointer to new tuning data */ |
| 8051 | /* */ |
| 8052 | /* All of the NAT rules hang off of a hash table that is searched with a */ |
| 8053 | /* hash on address after the netmask is applied. There is a different table*/ |
| 8054 | /* for both inbound rules (rdr) and outbound (map.) The resizing will only */ |
| 8055 | /* affect one of these two tables. */ |
| 8056 | /* ------------------------------------------------------------------------ */ |
| 8057 | int |
| 8058 | ipf_nat_rehash_rules(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) |
| 8059 | { |
| 8060 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 8061 | ipnat_t **newtab, *np, ***old, **npp; |
| 8062 | u_int newsize; |
| 8063 | u_int mask; |
| 8064 | u_int hv; |
| 8065 | |
| 8066 | newsize = p->ipftu_int; |
| 8067 | /* |
| 8068 | * In case there is nothing to do... |
| 8069 | */ |
| 8070 | if (newsize == *t->ipft_pint) |
| 8071 | return 0; |
| 8072 | |
| 8073 | /* |
| 8074 | * All inbound rules have the NAT_REDIRECT bit set in in_redir and |
| 8075 | * all outbound rules have either NAT_MAP or MAT_MAPBLK set. |
| 8076 | * This if statement allows for some more generic code to be below, |
| 8077 | * rather than two huge gobs of code that almost do the same thing. |
| 8078 | */ |
| 8079 | if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) { |
| 8080 | old = &softn->ipf_nat_rdr_rules; |
| 8081 | mask = NAT_REDIRECT; |
| 8082 | } else { |
| 8083 | old = &softn->ipf_nat_map_rules; |
| 8084 | mask = NAT_MAP|NAT_MAPBLK; |
| 8085 | } |
| 8086 | |
| 8087 | KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *)); |
| 8088 | if (newtab == NULL) { |
| 8089 | IPFERROR(60067); |
| 8090 | return ENOMEM; |
| 8091 | } |
| 8092 | |
| 8093 | bzero((char *)newtab, newsize * sizeof(ipnat_t *)); |
| 8094 | |
| 8095 | WRITE_ENTER(&softc->ipf_nat); |
| 8096 | |
| 8097 | if (*old != NULL) { |
| 8098 | KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **)); |
| 8099 | } |
| 8100 | *old = newtab; |
| 8101 | *t->ipft_pint = newsize; |
| 8102 | |
| 8103 | for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) { |
| 8104 | if ((np->in_redir & mask) == 0) |
| 8105 | continue; |
| 8106 | |
| 8107 | if (np->in_redir & NAT_REDIRECT) { |
| 8108 | np->in_rnext = NULL; |
| 8109 | hv = np->in_hv[0] % newsize; |
| 8110 | for (npp = newtab + hv; *npp != NULL; ) |
| 8111 | npp = &(*npp)->in_rnext; |
| 8112 | np->in_prnext = npp; |
| 8113 | *npp = np; |
| 8114 | } |
| 8115 | if (np->in_redir & NAT_MAP) { |
| 8116 | np->in_mnext = NULL; |
| 8117 | hv = np->in_hv[1] % newsize; |
| 8118 | for (npp = newtab + hv; *npp != NULL; ) |
| 8119 | npp = &(*npp)->in_mnext; |
| 8120 | np->in_pmnext = npp; |
| 8121 | *npp = np; |
| 8122 | } |
| 8123 | |
| 8124 | } |
| 8125 | RWLOCK_EXIT(&softc->ipf_nat); |
| 8126 | |
| 8127 | return 0; |
| 8128 | } |
| 8129 | |
| 8130 | |
| 8131 | /* ------------------------------------------------------------------------ */ |
| 8132 | /* Function: ipf_nat_hostmap_rehash */ |
| 8133 | /* Returns: int - 0 = success, else failure */ |
| 8134 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 8135 | /* t(I) - pointer to tunable */ |
| 8136 | /* p(I) - pointer to new tuning data */ |
| 8137 | /* */ |
| 8138 | /* Allocate and populate a new hash table that will contain a reference to */ |
| 8139 | /* all of the active IP# translations currently in place. */ |
| 8140 | /* ------------------------------------------------------------------------ */ |
| 8141 | int |
| 8142 | ipf_nat_hostmap_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, |
| 8143 | ipftuneval_t *p) |
| 8144 | { |
| 8145 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 8146 | hostmap_t *hm, **newtab; |
| 8147 | u_int newsize; |
| 8148 | u_int hv; |
| 8149 | |
| 8150 | newsize = p->ipftu_int; |
| 8151 | /* |
| 8152 | * In case there is nothing to do... |
| 8153 | */ |
| 8154 | if (newsize == *t->ipft_pint) |
| 8155 | return 0; |
| 8156 | |
| 8157 | KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *)); |
| 8158 | if (newtab == NULL) { |
| 8159 | IPFERROR(60068); |
| 8160 | return ENOMEM; |
| 8161 | } |
| 8162 | |
| 8163 | bzero((char *)newtab, newsize * sizeof(hostmap_t *)); |
| 8164 | |
| 8165 | WRITE_ENTER(&softc->ipf_nat); |
| 8166 | if (softn->ipf_hm_maptable != NULL) { |
| 8167 | KFREES(softn->ipf_hm_maptable, |
| 8168 | softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *)); |
| 8169 | } |
| 8170 | softn->ipf_hm_maptable = newtab; |
| 8171 | softn->ipf_nat_hostmap_sz = newsize; |
| 8172 | |
| 8173 | for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) { |
| 8174 | hv = hm->hm_hv % softn->ipf_nat_hostmap_sz; |
| 8175 | hm->hm_hnext = softn->ipf_hm_maptable[hv]; |
| 8176 | hm->hm_phnext = softn->ipf_hm_maptable + hv; |
| 8177 | if (softn->ipf_hm_maptable[hv] != NULL) |
| 8178 | softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; |
| 8179 | softn->ipf_hm_maptable[hv] = hm; |
| 8180 | } |
| 8181 | RWLOCK_EXIT(&softc->ipf_nat); |
| 8182 | |
| 8183 | return 0; |
| 8184 | } |
| 8185 | |
| 8186 | |
| 8187 | /* ------------------------------------------------------------------------ */ |
| 8188 | /* Function: ipf_nat_add_tq */ |
| 8189 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 8190 | /* */ |
| 8191 | /* ------------------------------------------------------------------------ */ |
| 8192 | ipftq_t * |
| 8193 | ipf_nat_add_tq(ipf_main_softc_t *softc, int ttl) |
| 8194 | { |
| 8195 | ipf_nat_softc_t *softs = softc->ipf_nat_soft; |
| 8196 | |
| 8197 | return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl); |
| 8198 | } |
| 8199 | |
| 8200 | /* ------------------------------------------------------------------------ */ |
| 8201 | /* Function: ipf_nat_uncreate */ |
| 8202 | /* Returns: Nil */ |
| 8203 | /* Parameters: fin(I) - pointer to packet information */ |
| 8204 | /* */ |
| 8205 | /* This function is used to remove a NAT entry from the NAT table when we */ |
| 8206 | /* decide that the create was actually in error. It is thus assumed that */ |
| 8207 | /* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */ |
| 8208 | /* with the translated packet (not the original), we have to reverse the */ |
| 8209 | /* lookup. Although doing the lookup is expensive (relatively speaking), it */ |
| 8210 | /* is not anticipated that this will be a frequent occurance for normal */ |
| 8211 | /* traffic patterns. */ |
| 8212 | /* ------------------------------------------------------------------------ */ |
| 8213 | void |
| 8214 | ipf_nat_uncreate(fr_info_t *fin) |
| 8215 | { |
| 8216 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 8217 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 8218 | int nflags; |
| 8219 | nat_t *nat; |
| 8220 | |
| 8221 | switch (fin->fin_p) |
| 8222 | { |
| 8223 | case IPPROTO_TCP : |
| 8224 | nflags = IPN_TCP; |
| 8225 | break; |
| 8226 | case IPPROTO_UDP : |
| 8227 | nflags = IPN_UDP; |
| 8228 | break; |
| 8229 | default : |
| 8230 | nflags = 0; |
| 8231 | break; |
| 8232 | } |
| 8233 | |
| 8234 | WRITE_ENTER(&softc->ipf_nat); |
| 8235 | |
| 8236 | if (fin->fin_out == 0) { |
| 8237 | nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, |
| 8238 | fin->fin_dst, fin->fin_src); |
| 8239 | } else { |
| 8240 | nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, |
| 8241 | fin->fin_src, fin->fin_dst); |
| 8242 | } |
| 8243 | |
| 8244 | if (nat != NULL) { |
| 8245 | NBUMPSIDE(fin->fin_out, ns_uncreate[0]); |
| 8246 | ipf_nat_delete(softc, nat, NL_DESTROY); |
| 8247 | } else { |
| 8248 | NBUMPSIDE(fin->fin_out, ns_uncreate[1]); |
| 8249 | } |
| 8250 | |
| 8251 | RWLOCK_EXIT(&softc->ipf_nat); |
| 8252 | } |
| 8253 | |
| 8254 | |
| 8255 | /* ------------------------------------------------------------------------ */ |
| 8256 | /* Function: ipf_nat_cmp_rules */ |
| 8257 | /* Returns: int - 0 == success, else rules do not match. */ |
| 8258 | /* Parameters: n1(I) - first rule to compare */ |
| 8259 | /* n2(I) - first rule to compare */ |
| 8260 | /* */ |
| 8261 | /* Compare two rules using pointers to each rule. A straight bcmp will not */ |
| 8262 | /* work as some fields (such as in_dst, in_pkts) actually do change once */ |
| 8263 | /* the rule has been loaded into the kernel. Whilst this function returns */ |
| 8264 | /* various non-zero returns, they're strictly to aid in debugging. Use of */ |
| 8265 | /* this function should simply care if the result is zero or not. */ |
| 8266 | /* ------------------------------------------------------------------------ */ |
| 8267 | static int |
| 8268 | ipf_nat_cmp_rules(ipnat_t *n1, ipnat_t *n2) |
| 8269 | { |
| 8270 | if (n1->in_size != n2->in_size) |
| 8271 | return 1; |
| 8272 | |
| 8273 | if (bcmp((char *)&n1->in_v, (char *)&n2->in_v, |
| 8274 | offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0) |
| 8275 | return 2; |
| 8276 | |
| 8277 | if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc, |
| 8278 | n1->in_size - offsetof(ipnat_t, in_tuc)) != 0) |
| 8279 | return 3; |
| 8280 | if (n1->in_ndst.na_atype != n2->in_ndst.na_atype) |
| 8281 | return 5; |
| 8282 | if (n1->in_ndst.na_function != n2->in_ndst.na_function) |
| 8283 | return 6; |
| 8284 | if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr, |
| 8285 | sizeof(n1->in_ndst.na_addr))) |
| 8286 | return 7; |
| 8287 | if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype) |
| 8288 | return 8; |
| 8289 | if (n1->in_nsrc.na_function != n2->in_nsrc.na_function) |
| 8290 | return 9; |
| 8291 | if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr, |
| 8292 | sizeof(n1->in_nsrc.na_addr))) |
| 8293 | return 10; |
| 8294 | if (n1->in_odst.na_atype != n2->in_odst.na_atype) |
| 8295 | return 11; |
| 8296 | if (n1->in_odst.na_function != n2->in_odst.na_function) |
| 8297 | return 12; |
| 8298 | if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr, |
| 8299 | sizeof(n1->in_odst.na_addr))) |
| 8300 | return 13; |
| 8301 | if (n1->in_osrc.na_atype != n2->in_osrc.na_atype) |
| 8302 | return 14; |
| 8303 | if (n1->in_osrc.na_function != n2->in_osrc.na_function) |
| 8304 | return 15; |
| 8305 | if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr, |
| 8306 | sizeof(n1->in_osrc.na_addr))) |
| 8307 | return 16; |
| 8308 | return 0; |
| 8309 | } |
| 8310 | |
| 8311 | |
| 8312 | /* ------------------------------------------------------------------------ */ |
| 8313 | /* Function: ipf_nat_rule_init */ |
| 8314 | /* Returns: int - 0 == success, else rules do not match. */ |
| 8315 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 8316 | /* softn(I) - pointer to NAT context structure */ |
| 8317 | /* n(I) - first rule to compare */ |
| 8318 | /* */ |
| 8319 | /* ------------------------------------------------------------------------ */ |
| 8320 | static int |
| 8321 | ipf_nat_rule_init(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n) |
| 8322 | { |
| 8323 | int error = 0; |
| 8324 | |
| 8325 | if ((n->in_flags & IPN_SIPRANGE) != 0) |
| 8326 | n->in_nsrcatype = FRI_RANGE; |
| 8327 | |
| 8328 | if ((n->in_flags & IPN_DIPRANGE) != 0) |
| 8329 | n->in_ndstatype = FRI_RANGE; |
| 8330 | |
| 8331 | if ((n->in_flags & IPN_SPLIT) != 0) |
| 8332 | n->in_ndstatype = FRI_SPLIT; |
| 8333 | |
| 8334 | if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0) |
| 8335 | n->in_spnext = n->in_spmin; |
| 8336 | |
| 8337 | if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) { |
| 8338 | n->in_dpnext = n->in_dpmin; |
| 8339 | } else if (n->in_redir == NAT_REDIRECT) { |
| 8340 | n->in_dpnext = n->in_dpmin; |
| 8341 | } |
| 8342 | |
| 8343 | n->in_stepnext = 0; |
| 8344 | |
| 8345 | switch (n->in_v[0]) |
| 8346 | { |
| 8347 | case 4 : |
| 8348 | error = ipf_nat_ruleaddrinit(softc, softn, n); |
| 8349 | if (error != 0) |
| 8350 | return error; |
| 8351 | break; |
| 8352 | #ifdef USE_INET6 |
| 8353 | case 6 : |
| 8354 | error = ipf_nat6_ruleaddrinit(softc, softn, n); |
| 8355 | if (error != 0) |
| 8356 | return error; |
| 8357 | break; |
| 8358 | #endif |
| 8359 | default : |
| 8360 | break; |
| 8361 | } |
| 8362 | |
| 8363 | if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { |
| 8364 | /* |
| 8365 | * Prerecord whether or not the destination of the divert |
| 8366 | * is local or not to the interface the packet is going |
| 8367 | * to be sent out. |
| 8368 | */ |
| 8369 | n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], |
| 8370 | n->in_ifps[1], &n->in_ndstip6); |
| 8371 | } |
| 8372 | |
| 8373 | return error; |
| 8374 | } |
| 8375 | |
| 8376 | |
| 8377 | /* ------------------------------------------------------------------------ */ |
| 8378 | /* Function: ipf_nat_rule_fini */ |
| 8379 | /* Returns: int - 0 == success, else rules do not match. */ |
| 8380 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 8381 | /* n(I) - rule to work on */ |
| 8382 | /* */ |
| 8383 | /* This function is used to release any objects that were referenced during */ |
| 8384 | /* the rule initialisation. This is useful both when free'ing the rule and */ |
| 8385 | /* when handling ioctls that need to initialise these fields but not */ |
| 8386 | /* actually use them after the ioctl processing has finished. */ |
| 8387 | /* ------------------------------------------------------------------------ */ |
| 8388 | static void |
| 8389 | ipf_nat_rule_fini(ipf_main_softc_t *softc, ipnat_t *n) |
| 8390 | { |
| 8391 | if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL) |
| 8392 | ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr); |
| 8393 | |
| 8394 | if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL) |
| 8395 | ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr); |
| 8396 | |
| 8397 | if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL) |
| 8398 | ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr); |
| 8399 | |
| 8400 | if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL) |
| 8401 | ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr); |
| 8402 | |
| 8403 | if (n->in_divmp != NULL) |
| 8404 | FREE_MB_T(n->in_divmp); |
| 8405 | } |
| 8406 | |