| 1 | /* $NetBSD: ip_nat6.c,v 1.10 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 ipf_nat6_KERNEL |
| 11 | # define KERNEL 1 |
| 12 | # define ipf_nat6_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) && defined(__NetBSD_Version__) && \ |
| 20 | (__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 ipf_nat6_KERNEL |
| 28 | # ifdef ipf_nat6__OpenBSD__ |
| 29 | struct file; |
| 30 | # endif |
| 31 | # include <sys/uio.h> |
| 32 | # undef ipf_nat6_KERNEL |
| 33 | #endif |
| 34 | #if defined(_KERNEL) && (__FreeBSD_version >= 220000) |
| 35 | # include <sys/filio.h> |
| 36 | # include <sys/fcntl.h> |
| 37 | #else |
| 38 | # include <sys/ioctl.h> |
| 39 | #endif |
| 40 | #if !defined(AIX) |
| 41 | # include <sys/fcntl.h> |
| 42 | #endif |
| 43 | #if !defined(linux) |
| 44 | # include <sys/protosw.h> |
| 45 | #endif |
| 46 | #include <sys/socket.h> |
| 47 | #if defined(_KERNEL) |
| 48 | # include <sys/systm.h> |
| 49 | # if !defined(__SVR4) && !defined(__svr4__) |
| 50 | # include <sys/mbuf.h> |
| 51 | # endif |
| 52 | #endif |
| 53 | #if defined(__SVR4) || defined(__svr4__) |
| 54 | # include <sys/filio.h> |
| 55 | # include <sys/byteorder.h> |
| 56 | # ifdef ipf_nat6_KERNEL |
| 57 | # include <sys/dditypes.h> |
| 58 | # endif |
| 59 | # include <sys/stream.h> |
| 60 | # include <sys/kmem.h> |
| 61 | #endif |
| 62 | #if ipf_nat6__FreeBSD_version >= 300000 |
| 63 | # include <sys/queue.h> |
| 64 | #endif |
| 65 | #include <net/if.h> |
| 66 | #if ipf_nat6__FreeBSD_version >= 300000 |
| 67 | # include <net/if_var.h> |
| 68 | #endif |
| 69 | #ifdef sun |
| 70 | # include <net/af.h> |
| 71 | #endif |
| 72 | #include <net/route.h> |
| 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/ip_fil.h" |
| 92 | #include "netinet/ip_nat.h" |
| 93 | #include "netinet/ip_frag.h" |
| 94 | #include "netinet/ip_state.h" |
| 95 | #include "netinet/ip_proxy.h" |
| 96 | #include "netinet/ip_lookup.h" |
| 97 | #include "netinet/ip_dstlist.h" |
| 98 | #include "netinet/ip_sync.h" |
| 99 | #if (__FreeBSD_version >= 300000) |
| 100 | # include <sys/malloc.h> |
| 101 | #endif |
| 102 | #ifdef HAS_SYS_MD5_H |
| 103 | # include <sys/md5.h> |
| 104 | #else |
| 105 | # include "md5.h" |
| 106 | #endif |
| 107 | /* END OF INCLUDES */ |
| 108 | |
| 109 | #undef SOCKADDR_IN |
| 110 | #define SOCKADDR_IN struct sockaddr_in |
| 111 | |
| 112 | __KERNEL_RCSID(0, "Id: ip_nat6.c,v 1.1.1.2 2012/07/22 13:45:29 darrenr Exp" ); |
| 113 | |
| 114 | #ifdef USE_INET6 |
| 115 | static struct hostmap *ipf_nat6_hostmap(ipf_nat_softc_t *, ipnat_t *, |
| 116 | i6addr_t *, i6addr_t *, |
| 117 | i6addr_t *, u_32_t); |
| 118 | static int ipf_nat6_match(fr_info_t *, ipnat_t *); |
| 119 | static void ipf_nat6_tabmove(ipf_nat_softc_t *, nat_t *); |
| 120 | static int ipf_nat6_decap(fr_info_t *, nat_t *); |
| 121 | static int ipf_nat6_nextaddr(fr_info_t *, nat_addr_t *, i6addr_t *, |
| 122 | i6addr_t *); |
| 123 | static int ipf_nat6_icmpquerytype(int); |
| 124 | static int ipf_nat6_out(fr_info_t *, nat_t *, int, u_32_t); |
| 125 | static int ipf_nat6_in(fr_info_t *, nat_t *, int, u_32_t); |
| 126 | static int ipf_nat6_builddivertmp(ipf_nat_softc_t *, ipnat_t *); |
| 127 | static int ipf_nat6_nextaddrinit(ipf_main_softc_t *, char *, |
| 128 | nat_addr_t *, int, void *); |
| 129 | static int ipf_nat6_insert(ipf_main_softc_t *, ipf_nat_softc_t *, |
| 130 | nat_t *); |
| 131 | |
| 132 | |
| 133 | #define NINCLSIDE6(y,x) ATOMIC_INCL(softn->ipf_nat_stats.ns_side6[y].x) |
| 134 | #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++ |
| 135 | #define NBUMPSIDE6(y,x) softn->ipf_nat_stats.ns_side6[y].x++ |
| 136 | #define NBUMPSIDE6D(y,x) \ |
| 137 | do { \ |
| 138 | softn->ipf_nat_stats.ns_side6[y].x++; \ |
| 139 | DT(x); \ |
| 140 | } while (0) |
| 141 | #define NBUMPSIDE6DX(y,x,z) \ |
| 142 | do { \ |
| 143 | softn->ipf_nat_stats.ns_side6[y].x++; \ |
| 144 | DT(z); \ |
| 145 | } while (0) |
| 146 | |
| 147 | |
| 148 | /* ------------------------------------------------------------------------ */ |
| 149 | /* Function: ipf_nat6_ruleaddrinit */ |
| 150 | /* Returns: int - 0 == success, else failure */ |
| 151 | /* Parameters: in(I) - NAT rule that requires address fields to be init'd */ |
| 152 | /* */ |
| 153 | /* For each of the source/destination address fields in a NAT rule, call */ |
| 154 | /* ipf_nat6_nextaddrinit() to prepare the structure for active duty. Other */ |
| 155 | /* IPv6 specific actions can also be taken care of here. */ |
| 156 | /* ------------------------------------------------------------------------ */ |
| 157 | int |
| 158 | ipf_nat6_ruleaddrinit(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, |
| 159 | ipnat_t *n) |
| 160 | { |
| 161 | int idx, error; |
| 162 | |
| 163 | if (n->in_redir == NAT_BIMAP) { |
| 164 | n->in_ndstip6 = n->in_osrcip6; |
| 165 | n->in_ndstmsk6 = n->in_osrcmsk6; |
| 166 | n->in_odstip6 = n->in_nsrcip6; |
| 167 | n->in_odstmsk6 = n->in_nsrcmsk6; |
| 168 | |
| 169 | } |
| 170 | |
| 171 | if (n->in_redir & NAT_REDIRECT) |
| 172 | idx = 1; |
| 173 | else |
| 174 | idx = 0; |
| 175 | /* |
| 176 | * Initialise all of the address fields. |
| 177 | */ |
| 178 | error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_osrc, 1, |
| 179 | n->in_ifps[idx]); |
| 180 | if (error != 0) |
| 181 | return error; |
| 182 | |
| 183 | error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_odst, 1, |
| 184 | n->in_ifps[idx]); |
| 185 | if (error != 0) |
| 186 | return error; |
| 187 | |
| 188 | error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1, |
| 189 | n->in_ifps[idx]); |
| 190 | if (error != 0) |
| 191 | return error; |
| 192 | |
| 193 | error = ipf_nat6_nextaddrinit(softc, n->in_names, &n->in_ndst, 1, |
| 194 | n->in_ifps[idx]); |
| 195 | if (error != 0) |
| 196 | return error; |
| 197 | |
| 198 | if (n->in_redir & NAT_DIVERTUDP) |
| 199 | ipf_nat6_builddivertmp(softn, n); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /* ------------------------------------------------------------------------ */ |
| 205 | /* Function: ipf_nat6_addrdr */ |
| 206 | /* Returns: Nil */ |
| 207 | /* Parameters: n(I) - pointer to NAT rule to add */ |
| 208 | /* */ |
| 209 | /* Adds a redirect rule to the hash table of redirect rules and the list of */ |
| 210 | /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */ |
| 211 | /* use by redirect rules. */ |
| 212 | /* ------------------------------------------------------------------------ */ |
| 213 | void |
| 214 | ipf_nat6_addrdr(ipf_nat_softc_t *softn, ipnat_t *n) |
| 215 | { |
| 216 | i6addr_t *mask; |
| 217 | ipnat_t **np; |
| 218 | i6addr_t j; |
| 219 | u_int hv; |
| 220 | int k; |
| 221 | |
| 222 | if ((n->in_redir & NAT_BIMAP) == NAT_BIMAP) { |
| 223 | k = count6bits(n->in_nsrcmsk6.i6); |
| 224 | mask = &n->in_nsrcmsk6; |
| 225 | IP6_AND(&n->in_odstip6, &n->in_odstmsk6, &j); |
| 226 | hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_rdrrules_sz); |
| 227 | |
| 228 | } else if (n->in_odstatype == FRI_NORMAL) { |
| 229 | k = count6bits(n->in_odstmsk6.i6); |
| 230 | mask = &n->in_odstmsk6; |
| 231 | IP6_AND(&n->in_odstip6, &n->in_odstmsk6, &j); |
| 232 | hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_rdrrules_sz); |
| 233 | } else { |
| 234 | k = 0; |
| 235 | hv = 0; |
| 236 | mask = NULL; |
| 237 | } |
| 238 | ipf_inet6_mask_add(k, mask, &softn->ipf_nat6_rdr_mask); |
| 239 | |
| 240 | np = softn->ipf_nat_rdr_rules + hv; |
| 241 | while (*np != NULL) |
| 242 | np = &(*np)->in_rnext; |
| 243 | n->in_rnext = NULL; |
| 244 | n->in_prnext = np; |
| 245 | n->in_hv[0] = hv; |
| 246 | n->in_use++; |
| 247 | *np = n; |
| 248 | } |
| 249 | |
| 250 | |
| 251 | /* ------------------------------------------------------------------------ */ |
| 252 | /* Function: ipf_nat6_addmap */ |
| 253 | /* Returns: Nil */ |
| 254 | /* Parameters: n(I) - pointer to NAT rule to add */ |
| 255 | /* */ |
| 256 | /* Adds a NAT map rule to the hash table of rules and the list of loaded */ |
| 257 | /* NAT rules. Updates the bitmask indicating which netmasks are in use by */ |
| 258 | /* redirect rules. */ |
| 259 | /* ------------------------------------------------------------------------ */ |
| 260 | void |
| 261 | ipf_nat6_addmap(ipf_nat_softc_t *softn, ipnat_t *n) |
| 262 | { |
| 263 | i6addr_t *mask; |
| 264 | ipnat_t **np; |
| 265 | i6addr_t j; |
| 266 | u_int hv; |
| 267 | int k; |
| 268 | |
| 269 | if (n->in_osrcatype == FRI_NORMAL) { |
| 270 | k = count6bits(n->in_osrcmsk6.i6); |
| 271 | mask = &n->in_osrcmsk6; |
| 272 | IP6_AND(&n->in_osrcip6, &n->in_osrcmsk6, &j); |
| 273 | hv = NAT_HASH_FN6(&j, 0, softn->ipf_nat_maprules_sz); |
| 274 | } else { |
| 275 | k = 0; |
| 276 | hv = 0; |
| 277 | mask = NULL; |
| 278 | } |
| 279 | ipf_inet6_mask_add(k, mask, &softn->ipf_nat6_map_mask); |
| 280 | |
| 281 | np = softn->ipf_nat_map_rules + hv; |
| 282 | while (*np != NULL) |
| 283 | np = &(*np)->in_mnext; |
| 284 | n->in_mnext = NULL; |
| 285 | n->in_pmnext = np; |
| 286 | n->in_hv[1] = hv; |
| 287 | n->in_use++; |
| 288 | *np = n; |
| 289 | } |
| 290 | |
| 291 | |
| 292 | /* ------------------------------------------------------------------------ */ |
| 293 | /* Function: ipf_nat6_del_rdr */ |
| 294 | /* Returns: Nil */ |
| 295 | /* Parameters: n(I) - pointer to NAT rule to delete */ |
| 296 | /* */ |
| 297 | /* Removes a NAT rdr rule from the hash table of NAT rdr rules. */ |
| 298 | /* ------------------------------------------------------------------------ */ |
| 299 | void |
| 300 | ipf_nat6_delrdr(ipf_nat_softc_t *softn, ipnat_t *n) |
| 301 | { |
| 302 | i6addr_t *mask; |
| 303 | int k; |
| 304 | |
| 305 | if ((n->in_redir & NAT_BIMAP) == NAT_BIMAP) { |
| 306 | k = count6bits(n->in_nsrcmsk6.i6); |
| 307 | mask = &n->in_nsrcmsk6; |
| 308 | } else if (n->in_odstatype == FRI_NORMAL) { |
| 309 | k = count6bits(n->in_odstmsk6.i6); |
| 310 | mask = &n->in_odstmsk6; |
| 311 | } else { |
| 312 | k = 0; |
| 313 | mask = NULL; |
| 314 | } |
| 315 | ipf_inet6_mask_del(k, mask, &softn->ipf_nat6_rdr_mask); |
| 316 | |
| 317 | if (n->in_rnext != NULL) |
| 318 | n->in_rnext->in_prnext = n->in_prnext; |
| 319 | *n->in_prnext = n->in_rnext; |
| 320 | n->in_use--; |
| 321 | } |
| 322 | |
| 323 | |
| 324 | /* ------------------------------------------------------------------------ */ |
| 325 | /* Function: ipf_nat6_delmap */ |
| 326 | /* Returns: Nil */ |
| 327 | /* Parameters: n(I) - pointer to NAT rule to delete */ |
| 328 | /* */ |
| 329 | /* Removes a NAT map rule from the hash table of NAT map rules. */ |
| 330 | /* ------------------------------------------------------------------------ */ |
| 331 | void |
| 332 | ipf_nat6_delmap(ipf_nat_softc_t *softn, ipnat_t *n) |
| 333 | { |
| 334 | i6addr_t *mask; |
| 335 | int k; |
| 336 | |
| 337 | if (n->in_osrcatype == FRI_NORMAL) { |
| 338 | k = count6bits(n->in_osrcmsk6.i6); |
| 339 | mask = &n->in_osrcmsk6; |
| 340 | } else { |
| 341 | k = 0; |
| 342 | mask = NULL; |
| 343 | } |
| 344 | ipf_inet6_mask_del(k, mask, &softn->ipf_nat6_map_mask); |
| 345 | |
| 346 | if (n->in_mnext != NULL) |
| 347 | n->in_mnext->in_pmnext = n->in_pmnext; |
| 348 | *n->in_pmnext = n->in_mnext; |
| 349 | n->in_use--; |
| 350 | } |
| 351 | |
| 352 | |
| 353 | /* ------------------------------------------------------------------------ */ |
| 354 | /* Function: ipf_nat6_hostmap */ |
| 355 | /* Returns: struct hostmap* - NULL if no hostmap could be created, */ |
| 356 | /* else a pointer to the hostmapping to use */ |
| 357 | /* Parameters: np(I) - pointer to NAT rule */ |
| 358 | /* real(I) - real IP address */ |
| 359 | /* map(I) - mapped IP address */ |
| 360 | /* port(I) - destination port number */ |
| 361 | /* Write Locks: ipf_nat */ |
| 362 | /* */ |
| 363 | /* Check if an ip address has already been allocated for a given mapping */ |
| 364 | /* that is not doing port based translation. If is not yet allocated, then */ |
| 365 | /* create a new entry if a non-NULL NAT rule pointer has been supplied. */ |
| 366 | /* ------------------------------------------------------------------------ */ |
| 367 | static struct hostmap * |
| 368 | ipf_nat6_hostmap(ipf_nat_softc_t *softn, ipnat_t *np, i6addr_t *src, |
| 369 | i6addr_t *dst, i6addr_t *map, u_32_t port) |
| 370 | { |
| 371 | hostmap_t *hm; |
| 372 | u_int hv; |
| 373 | |
| 374 | hv = (src->i6[3] ^ dst->i6[3]); |
| 375 | hv += (src->i6[2] ^ dst->i6[2]); |
| 376 | hv += (src->i6[1] ^ dst->i6[1]); |
| 377 | hv += (src->i6[0] ^ dst->i6[0]); |
| 378 | hv += src->i6[3]; |
| 379 | hv += src->i6[2]; |
| 380 | hv += src->i6[1]; |
| 381 | hv += src->i6[0]; |
| 382 | hv += dst->i6[3]; |
| 383 | hv += dst->i6[2]; |
| 384 | hv += dst->i6[1]; |
| 385 | hv += dst->i6[0]; |
| 386 | hv %= HOSTMAP_SIZE; |
| 387 | for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_next) |
| 388 | if (IP6_EQ(&hm->hm_osrc6, src) && |
| 389 | IP6_EQ(&hm->hm_odst6, dst) && |
| 390 | ((np == NULL) || (np == hm->hm_ipnat)) && |
| 391 | ((port == 0) || (port == hm->hm_port))) { |
| 392 | softn->ipf_nat_stats.ns_hm_addref++; |
| 393 | hm->hm_ref++; |
| 394 | return hm; |
| 395 | } |
| 396 | |
| 397 | if (np == NULL) { |
| 398 | softn->ipf_nat_stats.ns_hm_nullnp++; |
| 399 | return NULL; |
| 400 | } |
| 401 | |
| 402 | KMALLOC(hm, hostmap_t *); |
| 403 | if (hm) { |
| 404 | hm->hm_next = softn->ipf_hm_maplist; |
| 405 | hm->hm_pnext = &softn->ipf_hm_maplist; |
| 406 | if (softn->ipf_hm_maplist != NULL) |
| 407 | softn->ipf_hm_maplist->hm_pnext = &hm->hm_next; |
| 408 | softn->ipf_hm_maplist = hm; |
| 409 | hm->hm_hnext = softn->ipf_hm_maptable[hv]; |
| 410 | hm->hm_phnext = softn->ipf_hm_maptable + hv; |
| 411 | if (softn->ipf_hm_maptable[hv] != NULL) |
| 412 | softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; |
| 413 | softn->ipf_hm_maptable[hv] = hm; |
| 414 | hm->hm_ipnat = np; |
| 415 | np->in_use++; |
| 416 | hm->hm_osrcip6 = *src; |
| 417 | hm->hm_odstip6 = *dst; |
| 418 | hm->hm_nsrcip6 = *map; |
| 419 | hm->hm_ndstip6.i6[0] = 0; |
| 420 | hm->hm_ndstip6.i6[1] = 0; |
| 421 | hm->hm_ndstip6.i6[2] = 0; |
| 422 | hm->hm_ndstip6.i6[3] = 0; |
| 423 | hm->hm_ref = 1; |
| 424 | hm->hm_port = port; |
| 425 | hm->hm_hv = hv; |
| 426 | hm->hm_v = 6; |
| 427 | softn->ipf_nat_stats.ns_hm_new++; |
| 428 | } else { |
| 429 | softn->ipf_nat_stats.ns_hm_newfail++; |
| 430 | } |
| 431 | return hm; |
| 432 | } |
| 433 | |
| 434 | |
| 435 | /* ------------------------------------------------------------------------ */ |
| 436 | /* Function: ipf_nat6_newmap */ |
| 437 | /* Returns: int - -1 == error, 0 == success */ |
| 438 | /* Parameters: fin(I) - pointer to packet information */ |
| 439 | /* nat(I) - pointer to NAT entry */ |
| 440 | /* ni(I) - pointer to structure with misc. information needed */ |
| 441 | /* to create new NAT entry. */ |
| 442 | /* */ |
| 443 | /* Given an empty NAT structure, populate it with new information about a */ |
| 444 | /* new NAT session, as defined by the matching NAT rule. */ |
| 445 | /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ |
| 446 | /* to the new IP address for the translation. */ |
| 447 | /* ------------------------------------------------------------------------ */ |
| 448 | int |
| 449 | ipf_nat6_newmap(fr_info_t *fin, nat_t *nat, natinfo_t *ni) |
| 450 | { |
| 451 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 452 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 453 | u_short st_port, dport, sport, port, sp, dp; |
| 454 | i6addr_t in, st_ip; |
| 455 | hostmap_t *hm; |
| 456 | u_32_t flags; |
| 457 | ipnat_t *np; |
| 458 | nat_t *natl; |
| 459 | int l; |
| 460 | |
| 461 | /* |
| 462 | * If it's an outbound packet which doesn't match any existing |
| 463 | * record, then create a new port |
| 464 | */ |
| 465 | l = 0; |
| 466 | hm = NULL; |
| 467 | np = ni->nai_np; |
| 468 | st_ip = np->in_snip6; |
| 469 | st_port = np->in_spnext; |
| 470 | flags = nat->nat_flags; |
| 471 | |
| 472 | if (flags & IPN_ICMPQUERY) { |
| 473 | sport = fin->fin_data[1]; |
| 474 | dport = 0; |
| 475 | } else { |
| 476 | sport = htons(fin->fin_data[0]); |
| 477 | dport = htons(fin->fin_data[1]); |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Do a loop until we either run out of entries to try or we find |
| 482 | * a NAT mapping that isn't currently being used. This is done |
| 483 | * because the change to the source is not (usually) being fixed. |
| 484 | */ |
| 485 | do { |
| 486 | port = 0; |
| 487 | in = np->in_nsrc.na_nextaddr; |
| 488 | if (l == 0) { |
| 489 | /* |
| 490 | * Check to see if there is an existing NAT |
| 491 | * setup for this IP address pair. |
| 492 | */ |
| 493 | hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6, |
| 494 | &fin->fin_dst6, &in, 0); |
| 495 | if (hm != NULL) |
| 496 | in = hm->hm_nsrcip6; |
| 497 | } else if ((l == 1) && (hm != NULL)) { |
| 498 | ipf_nat_hostmapdel(softc, &hm); |
| 499 | } |
| 500 | |
| 501 | nat->nat_hm = hm; |
| 502 | |
| 503 | if (IP6_ISONES(&np->in_nsrcmsk6) && (np->in_spnext == 0)) { |
| 504 | if (l > 0) { |
| 505 | NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_1); |
| 506 | return -1; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | if ((np->in_redir == NAT_BIMAP) && |
| 511 | IP6_EQ(&np->in_osrcmsk6, &np->in_nsrcmsk6)) { |
| 512 | i6addr_t temp; |
| 513 | /* |
| 514 | * map the address block in a 1:1 fashion |
| 515 | */ |
| 516 | temp.i6[0] = fin->fin_src6.i6[0] & |
| 517 | ~np->in_osrcmsk6.i6[0]; |
| 518 | temp.i6[1] = fin->fin_src6.i6[1] & |
| 519 | ~np->in_osrcmsk6.i6[1]; |
| 520 | temp.i6[2] = fin->fin_src6.i6[2] & |
| 521 | ~np->in_osrcmsk6.i6[0]; |
| 522 | temp.i6[3] = fin->fin_src6.i6[3] & |
| 523 | ~np->in_osrcmsk6.i6[3]; |
| 524 | in = np->in_nsrcip6; |
| 525 | IP6_MERGE(&in, &temp, &np->in_osrc); |
| 526 | |
| 527 | #ifdef NEED_128BIT_MATH |
| 528 | } else if (np->in_redir & NAT_MAPBLK) { |
| 529 | if ((l >= np->in_ppip) || ((l > 0) && |
| 530 | !(flags & IPN_TCPUDP))) { |
| 531 | NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_2); |
| 532 | return -1; |
| 533 | } |
| 534 | /* |
| 535 | * map-block - Calculate destination address. |
| 536 | */ |
| 537 | IP6_MASK(&in, &fin->fin_src6, &np->in_osrcmsk6); |
| 538 | in = ntohl(in); |
| 539 | inb = in; |
| 540 | in.s_addr /= np->in_ippip; |
| 541 | in.s_addr &= ntohl(~np->in_nsrcmsk6); |
| 542 | in.s_addr += ntohl(np->in_nsrcaddr6); |
| 543 | /* |
| 544 | * Calculate destination port. |
| 545 | */ |
| 546 | if ((flags & IPN_TCPUDP) && |
| 547 | (np->in_ppip != 0)) { |
| 548 | port = ntohs(sport) + l; |
| 549 | port %= np->in_ppip; |
| 550 | port += np->in_ppip * |
| 551 | (inb.s_addr % np->in_ippip); |
| 552 | port += MAPBLK_MINPORT; |
| 553 | port = htons(port); |
| 554 | } |
| 555 | #endif |
| 556 | |
| 557 | } else if (IP6_ISZERO(&np->in_nsrcaddr) && |
| 558 | IP6_ISONES(&np->in_nsrcmsk)) { |
| 559 | /* |
| 560 | * 0/32 - use the interface's IP address. |
| 561 | */ |
| 562 | if ((l > 0) || |
| 563 | ipf_ifpaddr(softc, 6, FRI_NORMAL, fin->fin_ifp, |
| 564 | &in, NULL) == -1) { |
| 565 | NBUMPSIDE6DX(1, ns_new_ifpaddr, |
| 566 | ns_new_ifpaddr_1); |
| 567 | return -1; |
| 568 | } |
| 569 | |
| 570 | } else if (IP6_ISZERO(&np->in_nsrcip6) && |
| 571 | IP6_ISZERO(&np->in_nsrcmsk6)) { |
| 572 | /* |
| 573 | * 0/0 - use the original source address/port. |
| 574 | */ |
| 575 | if (l > 0) { |
| 576 | NBUMPSIDE6DX(1, ns_exhausted, ns_exhausted_3); |
| 577 | return -1; |
| 578 | } |
| 579 | in = fin->fin_src6; |
| 580 | |
| 581 | } else if (!IP6_ISONES(&np->in_nsrcmsk6) && |
| 582 | (np->in_spnext == 0) && ((l > 0) || (hm == NULL))) { |
| 583 | IP6_INC(&np->in_snip6); |
| 584 | } |
| 585 | |
| 586 | natl = NULL; |
| 587 | |
| 588 | if ((flags & IPN_TCPUDP) && |
| 589 | ((np->in_redir & NAT_MAPBLK) == 0) && |
| 590 | (np->in_flags & IPN_AUTOPORTMAP)) { |
| 591 | #ifdef NEED_128BIT_MATH |
| 592 | /* |
| 593 | * "ports auto" (without map-block) |
| 594 | */ |
| 595 | if ((l > 0) && (l % np->in_ppip == 0)) { |
| 596 | if ((l > np->in_ppip) && |
| 597 | !IP6_ISONES(&np->in_nsrcmsk)) { |
| 598 | IP6_INC(&np->in_snip6) |
| 599 | } |
| 600 | } |
| 601 | if (np->in_ppip != 0) { |
| 602 | port = ntohs(sport); |
| 603 | port += (l % np->in_ppip); |
| 604 | port %= np->in_ppip; |
| 605 | port += np->in_ppip * |
| 606 | (ntohl(fin->fin_src6) % |
| 607 | np->in_ippip); |
| 608 | port += MAPBLK_MINPORT; |
| 609 | port = htons(port); |
| 610 | } |
| 611 | #endif |
| 612 | |
| 613 | } else if (((np->in_redir & NAT_MAPBLK) == 0) && |
| 614 | (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) { |
| 615 | /* |
| 616 | * Standard port translation. Select next port. |
| 617 | */ |
| 618 | if (np->in_flags & IPN_SEQUENTIAL) { |
| 619 | port = np->in_spnext; |
| 620 | } else { |
| 621 | port = ipf_random() % (np->in_spmax - |
| 622 | np->in_spmin + 1); |
| 623 | port += np->in_spmin; |
| 624 | } |
| 625 | port = htons(port); |
| 626 | np->in_spnext++; |
| 627 | |
| 628 | if (np->in_spnext > np->in_spmax) { |
| 629 | np->in_spnext = np->in_spmin; |
| 630 | if (!IP6_ISONES(&np->in_nsrcmsk6)) { |
| 631 | IP6_INC(&np->in_snip6); |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | if (np->in_flags & IPN_SIPRANGE) { |
| 637 | if (IP6_GT(&np->in_snip, &np->in_nsrcmsk)) |
| 638 | np->in_snip6 = np->in_nsrcip6; |
| 639 | } else { |
| 640 | i6addr_t a1, a2; |
| 641 | |
| 642 | a1 = np->in_snip6; |
| 643 | IP6_INC(&a1); |
| 644 | IP6_AND(&a1, &np->in_nsrcmsk6, &a2); |
| 645 | |
| 646 | if (!IP6_ISONES(&np->in_nsrcmsk6) && |
| 647 | IP6_GT(&a2, &np->in_nsrcip6)) { |
| 648 | IP6_ADD(&np->in_nsrcip6, 1, &np->in_snip6); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY))) |
| 653 | port = sport; |
| 654 | |
| 655 | /* |
| 656 | * Here we do a lookup of the connection as seen from |
| 657 | * the outside. If an IP# pair already exists, try |
| 658 | * again. So if you have A->B becomes C->B, you can |
| 659 | * also have D->E become C->E but not D->B causing |
| 660 | * another C->B. Also take protocol and ports into |
| 661 | * account when determining whether a pre-existing |
| 662 | * NAT setup will cause an external conflict where |
| 663 | * this is appropriate. |
| 664 | */ |
| 665 | sp = fin->fin_data[0]; |
| 666 | dp = fin->fin_data[1]; |
| 667 | fin->fin_data[0] = fin->fin_data[1]; |
| 668 | fin->fin_data[1] = ntohs(port); |
| 669 | natl = ipf_nat6_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), |
| 670 | (u_int)fin->fin_p, &fin->fin_dst6.in6, |
| 671 | &in.in6); |
| 672 | fin->fin_data[0] = sp; |
| 673 | fin->fin_data[1] = dp; |
| 674 | |
| 675 | /* |
| 676 | * Has the search wrapped around and come back to the |
| 677 | * start ? |
| 678 | */ |
| 679 | if ((natl != NULL) && |
| 680 | (np->in_spnext != 0) && (st_port == np->in_spnext) && |
| 681 | (!IP6_ISZERO(&np->in_snip6) && |
| 682 | IP6_EQ(&st_ip, &np->in_snip6))) { |
| 683 | NBUMPSIDE6D(1, ns_wrap); |
| 684 | return -1; |
| 685 | } |
| 686 | l++; |
| 687 | } while (natl != NULL); |
| 688 | |
| 689 | /* Setup the NAT table */ |
| 690 | nat->nat_osrc6 = fin->fin_src6; |
| 691 | nat->nat_nsrc6 = in; |
| 692 | nat->nat_odst6 = fin->fin_dst6; |
| 693 | nat->nat_ndst6 = fin->fin_dst6; |
| 694 | if (nat->nat_hm == NULL) |
| 695 | nat->nat_hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6, |
| 696 | &fin->fin_dst6, |
| 697 | &nat->nat_nsrc6, 0); |
| 698 | |
| 699 | if (flags & IPN_TCPUDP) { |
| 700 | nat->nat_osport = sport; |
| 701 | nat->nat_nsport = port; /* sport */ |
| 702 | nat->nat_odport = dport; |
| 703 | nat->nat_ndport = dport; |
| 704 | ((tcphdr_t *)fin->fin_dp)->th_sport = port; |
| 705 | } else if (flags & IPN_ICMPQUERY) { |
| 706 | nat->nat_oicmpid = fin->fin_data[1]; |
| 707 | ((struct icmp6_hdr *)fin->fin_dp)->icmp6_id = port; |
| 708 | nat->nat_nicmpid = port; |
| 709 | } |
| 710 | return 0; |
| 711 | } |
| 712 | |
| 713 | |
| 714 | /* ------------------------------------------------------------------------ */ |
| 715 | /* Function: ipf_nat6_newrdr */ |
| 716 | /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ |
| 717 | /* allow rule to be moved if IPN_ROUNDR is set. */ |
| 718 | /* Parameters: fin(I) - pointer to packet information */ |
| 719 | /* nat(I) - pointer to NAT entry */ |
| 720 | /* ni(I) - pointer to structure with misc. information needed */ |
| 721 | /* to create new NAT entry. */ |
| 722 | /* */ |
| 723 | /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ |
| 724 | /* to the new IP address for the translation. */ |
| 725 | /* ------------------------------------------------------------------------ */ |
| 726 | int |
| 727 | ipf_nat6_newrdr(fr_info_t *fin, nat_t *nat, natinfo_t *ni) |
| 728 | { |
| 729 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 730 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 731 | u_short nport, dport, sport; |
| 732 | u_short sp, dp; |
| 733 | hostmap_t *hm; |
| 734 | u_32_t flags; |
| 735 | i6addr_t in; |
| 736 | ipnat_t *np; |
| 737 | nat_t *natl; |
| 738 | int move; |
| 739 | |
| 740 | move = 1; |
| 741 | hm = NULL; |
| 742 | in.i6[0] = 0; |
| 743 | in.i6[1] = 0; |
| 744 | in.i6[2] = 0; |
| 745 | in.i6[3] = 0; |
| 746 | np = ni->nai_np; |
| 747 | flags = nat->nat_flags; |
| 748 | |
| 749 | if (flags & IPN_ICMPQUERY) { |
| 750 | dport = fin->fin_data[1]; |
| 751 | sport = 0; |
| 752 | } else { |
| 753 | sport = htons(fin->fin_data[0]); |
| 754 | dport = htons(fin->fin_data[1]); |
| 755 | } |
| 756 | |
| 757 | /* TRACE sport, dport */ |
| 758 | |
| 759 | |
| 760 | /* |
| 761 | * If the matching rule has IPN_STICKY set, then we want to have the |
| 762 | * same rule kick in as before. Why would this happen? If you have |
| 763 | * a collection of rdr rules with "round-robin sticky", the current |
| 764 | * packet might match a different one to the previous connection but |
| 765 | * we want the same destination to be used. |
| 766 | */ |
| 767 | if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) && |
| 768 | ((np->in_flags & IPN_STICKY) != 0)) { |
| 769 | hm = ipf_nat6_hostmap(softn, NULL, &fin->fin_src6, |
| 770 | &fin->fin_dst6, &in, (u_32_t)dport); |
| 771 | if (hm != NULL) { |
| 772 | in = hm->hm_ndstip6; |
| 773 | np = hm->hm_ipnat; |
| 774 | ni->nai_np = np; |
| 775 | move = 0; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * Otherwise, it's an inbound packet. Most likely, we don't |
| 781 | * want to rewrite source ports and source addresses. Instead, |
| 782 | * we want to rewrite to a fixed internal address and fixed |
| 783 | * internal port. |
| 784 | */ |
| 785 | if (np->in_flags & IPN_SPLIT) { |
| 786 | in = np->in_dnip6; |
| 787 | |
| 788 | if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) { |
| 789 | hm = ipf_nat6_hostmap(softn, NULL, &fin->fin_src6, |
| 790 | &fin->fin_dst6, &in, |
| 791 | (u_32_t)dport); |
| 792 | if (hm != NULL) { |
| 793 | in = hm->hm_ndstip6; |
| 794 | move = 0; |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | if (hm == NULL || hm->hm_ref == 1) { |
| 799 | if (IP6_EQ(&np->in_ndstip6, &in)) { |
| 800 | np->in_dnip6 = np->in_ndstmsk6; |
| 801 | move = 0; |
| 802 | } else { |
| 803 | np->in_dnip6 = np->in_ndstip6; |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | } else if (IP6_ISZERO(&np->in_ndstaddr) && |
| 808 | IP6_ISONES(&np->in_ndstmsk)) { |
| 809 | /* |
| 810 | * 0/32 - use the interface's IP address. |
| 811 | */ |
| 812 | if (ipf_ifpaddr(softc, 6, FRI_NORMAL, fin->fin_ifp, |
| 813 | &in, NULL) == -1) { |
| 814 | NBUMPSIDE6DX(0, ns_new_ifpaddr, ns_new_ifpaddr_2); |
| 815 | return -1; |
| 816 | } |
| 817 | |
| 818 | } else if (IP6_ISZERO(&np->in_ndstip6) && |
| 819 | IP6_ISZERO(&np->in_ndstmsk6)) { |
| 820 | /* |
| 821 | * 0/0 - use the original destination address/port. |
| 822 | */ |
| 823 | in = fin->fin_dst6; |
| 824 | |
| 825 | } else if (np->in_redir == NAT_BIMAP && |
| 826 | IP6_EQ(&np->in_ndstmsk6, &np->in_odstmsk6)) { |
| 827 | i6addr_t temp; |
| 828 | /* |
| 829 | * map the address block in a 1:1 fashion |
| 830 | */ |
| 831 | temp.i6[0] = fin->fin_dst6.i6[0] & ~np->in_osrcmsk6.i6[0]; |
| 832 | temp.i6[1] = fin->fin_dst6.i6[1] & ~np->in_osrcmsk6.i6[1]; |
| 833 | temp.i6[2] = fin->fin_dst6.i6[2] & ~np->in_osrcmsk6.i6[0]; |
| 834 | temp.i6[3] = fin->fin_dst6.i6[3] & ~np->in_osrcmsk6.i6[3]; |
| 835 | in = np->in_ndstip6; |
| 836 | IP6_MERGE(&in, &temp, &np->in_ndstmsk6); |
| 837 | } else { |
| 838 | in = np->in_ndstip6; |
| 839 | } |
| 840 | |
| 841 | if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0)) |
| 842 | nport = dport; |
| 843 | else { |
| 844 | /* |
| 845 | * Whilst not optimized for the case where |
| 846 | * pmin == pmax, the gain is not significant. |
| 847 | */ |
| 848 | if (((np->in_flags & IPN_FIXEDDPORT) == 0) && |
| 849 | (np->in_odport != np->in_dtop)) { |
| 850 | nport = ntohs(dport) - np->in_odport + np->in_dpmax; |
| 851 | nport = htons(nport); |
| 852 | } else { |
| 853 | nport = htons(np->in_dpnext); |
| 854 | np->in_dpnext++; |
| 855 | if (np->in_dpnext > np->in_dpmax) |
| 856 | np->in_dpnext = np->in_dpmin; |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | /* |
| 861 | * When the redirect-to address is set to 0.0.0.0, just |
| 862 | * assume a blank `forwarding' of the packet. We don't |
| 863 | * setup any translation for this either. |
| 864 | */ |
| 865 | if (IP6_ISZERO(&in)) { |
| 866 | if (nport == dport) { |
| 867 | NBUMPSIDE6D(0, ns_xlate_null); |
| 868 | return -1; |
| 869 | } |
| 870 | in = fin->fin_dst6; |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * Check to see if this redirect mapping already exists and if |
| 875 | * it does, return "failure" (allowing it to be created will just |
| 876 | * cause one or both of these "connections" to stop working.) |
| 877 | */ |
| 878 | sp = fin->fin_data[0]; |
| 879 | dp = fin->fin_data[1]; |
| 880 | fin->fin_data[1] = fin->fin_data[0]; |
| 881 | fin->fin_data[0] = ntohs(nport); |
| 882 | natl = ipf_nat6_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), |
| 883 | (u_int)fin->fin_p, &in.in6, |
| 884 | &fin->fin_src6.in6); |
| 885 | fin->fin_data[0] = sp; |
| 886 | fin->fin_data[1] = dp; |
| 887 | if (natl != NULL) { |
| 888 | NBUMPSIDE6D(0, ns_xlate_exists); |
| 889 | return -1; |
| 890 | } |
| 891 | |
| 892 | nat->nat_ndst6 = in; |
| 893 | nat->nat_odst6 = fin->fin_dst6; |
| 894 | nat->nat_nsrc6 = fin->fin_src6; |
| 895 | nat->nat_osrc6 = fin->fin_src6; |
| 896 | if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0)) |
| 897 | nat->nat_hm = ipf_nat6_hostmap(softn, np, &fin->fin_src6, |
| 898 | &fin->fin_dst6, &in, |
| 899 | (u_32_t)dport); |
| 900 | |
| 901 | if (flags & IPN_TCPUDP) { |
| 902 | nat->nat_odport = dport; |
| 903 | nat->nat_ndport = nport; |
| 904 | nat->nat_osport = sport; |
| 905 | nat->nat_nsport = sport; |
| 906 | ((tcphdr_t *)fin->fin_dp)->th_dport = nport; |
| 907 | } else if (flags & IPN_ICMPQUERY) { |
| 908 | nat->nat_oicmpid = fin->fin_data[1]; |
| 909 | ((struct icmp6_hdr *)fin->fin_dp)->icmp6_id = nport; |
| 910 | nat->nat_nicmpid = nport; |
| 911 | } |
| 912 | |
| 913 | return move; |
| 914 | } |
| 915 | |
| 916 | /* ------------------------------------------------------------------------ */ |
| 917 | /* Function: ipf_nat6_add */ |
| 918 | /* Returns: nat6_t* - NULL == failure to create new NAT structure, */ |
| 919 | /* else pointer to new NAT structure */ |
| 920 | /* Parameters: fin(I) - pointer to packet information */ |
| 921 | /* np(I) - pointer to NAT rule */ |
| 922 | /* natsave(I) - pointer to where to store NAT struct pointer */ |
| 923 | /* flags(I) - flags describing the current packet */ |
| 924 | /* direction(I) - direction of packet (in/out) */ |
| 925 | /* Write Lock: ipf_nat */ |
| 926 | /* */ |
| 927 | /* Attempts to create a new NAT entry. Does not actually change the packet */ |
| 928 | /* in any way. */ |
| 929 | /* */ |
| 930 | /* This fucntion is in three main parts: (1) deal with creating a new NAT */ |
| 931 | /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */ |
| 932 | /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */ |
| 933 | /* and (3) building that structure and putting it into the NAT table(s). */ |
| 934 | /* */ |
| 935 | /* NOTE: natsave should NOT be used top point back to an ipstate_t struct */ |
| 936 | /* as it can result in memory being corrupted. */ |
| 937 | /* ------------------------------------------------------------------------ */ |
| 938 | nat_t * |
| 939 | ipf_nat6_add(fr_info_t *fin, ipnat_t *np, nat_t **natsave, u_int flags, |
| 940 | int direction) |
| 941 | { |
| 942 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 943 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 944 | hostmap_t *hm = NULL; |
| 945 | nat_t *nat, *natl; |
| 946 | natstat_t *nsp; |
| 947 | u_int nflags; |
| 948 | natinfo_t ni; |
| 949 | int move; |
| 950 | #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC) |
| 951 | qpktinfo_t *qpi = fin->fin_qpi; |
| 952 | #endif |
| 953 | |
| 954 | nsp = &softn->ipf_nat_stats; |
| 955 | |
| 956 | if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) > |
| 957 | softn->ipf_nat_table_wm_high) { |
| 958 | softn->ipf_nat_doflush = 1; |
| 959 | } |
| 960 | |
| 961 | if (nsp->ns_active >= softn->ipf_nat_table_max) { |
| 962 | NBUMPSIDE6(fin->fin_out, ns_table_max); |
| 963 | return NULL; |
| 964 | } |
| 965 | |
| 966 | move = 1; |
| 967 | nflags = np->in_flags & flags; |
| 968 | nflags &= NAT_FROMRULE; |
| 969 | |
| 970 | ni.nai_np = np; |
| 971 | ni.nai_dport = 0; |
| 972 | ni.nai_sport = 0; |
| 973 | |
| 974 | /* Give me a new nat */ |
| 975 | KMALLOC(nat, nat_t *); |
| 976 | if (nat == NULL) { |
| 977 | NBUMPSIDE6(fin->fin_out, ns_memfail); |
| 978 | /* |
| 979 | * Try to automatically tune the max # of entries in the |
| 980 | * table allowed to be less than what will cause kmem_alloc() |
| 981 | * to fail and try to eliminate panics due to out of memory |
| 982 | * conditions arising. |
| 983 | */ |
| 984 | if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) && |
| 985 | (nsp->ns_active > 100)) { |
| 986 | softn->ipf_nat_table_max = nsp->ns_active - 100; |
| 987 | printf("table_max reduced to %d\n" , |
| 988 | softn->ipf_nat_table_max); |
| 989 | } |
| 990 | return NULL; |
| 991 | } |
| 992 | |
| 993 | if (flags & IPN_ICMPQUERY) { |
| 994 | /* |
| 995 | * In the ICMP query NAT code, we translate the ICMP id fields |
| 996 | * to make them unique. This is indepedent of the ICMP type |
| 997 | * (e.g. in the unlikely event that a host sends an echo and |
| 998 | * an tstamp request with the same id, both packets will have |
| 999 | * their ip address/id field changed in the same way). |
| 1000 | */ |
| 1001 | /* The icmp6_id field is used by the sender to identify the |
| 1002 | * process making the icmp request. (the receiver justs |
| 1003 | * copies it back in its response). So, it closely matches |
| 1004 | * the concept of source port. We overlay sport, so we can |
| 1005 | * maximally reuse the existing code. |
| 1006 | */ |
| 1007 | ni.nai_sport = fin->fin_data[1]; |
| 1008 | ni.nai_dport = 0; |
| 1009 | } |
| 1010 | |
| 1011 | bzero((char *)nat, sizeof(*nat)); |
| 1012 | nat->nat_flags = flags; |
| 1013 | nat->nat_redir = np->in_redir; |
| 1014 | nat->nat_dir = direction; |
| 1015 | nat->nat_pr[0] = fin->fin_p; |
| 1016 | nat->nat_pr[1] = fin->fin_p; |
| 1017 | |
| 1018 | /* |
| 1019 | * Search the current table for a match and create a new mapping |
| 1020 | * if there is none found. |
| 1021 | */ |
| 1022 | if (np->in_redir & NAT_DIVERTUDP) { |
| 1023 | move = ipf_nat6_newdivert(fin, nat, &ni); |
| 1024 | |
| 1025 | } else if (np->in_redir & NAT_REWRITE) { |
| 1026 | move = ipf_nat6_newrewrite(fin, nat, &ni); |
| 1027 | |
| 1028 | } else if (direction == NAT_OUTBOUND) { |
| 1029 | /* |
| 1030 | * We can now arrange to call this for the same connection |
| 1031 | * because ipf_nat6_new doesn't protect the code path into |
| 1032 | * this function. |
| 1033 | */ |
| 1034 | natl = ipf_nat6_outlookup(fin, nflags, (u_int)fin->fin_p, |
| 1035 | &fin->fin_src6.in6, |
| 1036 | &fin->fin_dst6.in6); |
| 1037 | if (natl != NULL) { |
| 1038 | KFREE(nat); |
| 1039 | nat = natl; |
| 1040 | goto done; |
| 1041 | } |
| 1042 | |
| 1043 | move = ipf_nat6_newmap(fin, nat, &ni); |
| 1044 | } else { |
| 1045 | /* |
| 1046 | * NAT_INBOUND is used for redirects rules |
| 1047 | */ |
| 1048 | natl = ipf_nat6_inlookup(fin, nflags, (u_int)fin->fin_p, |
| 1049 | &fin->fin_src6.in6, |
| 1050 | &fin->fin_dst6.in6); |
| 1051 | if (natl != NULL) { |
| 1052 | KFREE(nat); |
| 1053 | nat = natl; |
| 1054 | goto done; |
| 1055 | } |
| 1056 | |
| 1057 | move = ipf_nat6_newrdr(fin, nat, &ni); |
| 1058 | } |
| 1059 | if (move == -1) |
| 1060 | goto badnat; |
| 1061 | |
| 1062 | np = ni.nai_np; |
| 1063 | |
| 1064 | nat->nat_mssclamp = np->in_mssclamp; |
| 1065 | nat->nat_me = natsave; |
| 1066 | nat->nat_fr = fin->fin_fr; |
| 1067 | nat->nat_rev = fin->fin_rev; |
| 1068 | nat->nat_ptr = np; |
| 1069 | nat->nat_dlocal = np->in_dlocal; |
| 1070 | |
| 1071 | if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) { |
| 1072 | if (ipf_proxy_new(fin, nat) == -1) { |
| 1073 | NBUMPSIDE6D(fin->fin_out, ns_appr_fail); |
| 1074 | goto badnat; |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | nat->nat_ifps[0] = np->in_ifps[0]; |
| 1079 | if (np->in_ifps[0] != NULL) { |
| 1080 | COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]); |
| 1081 | } |
| 1082 | |
| 1083 | nat->nat_ifps[1] = np->in_ifps[1]; |
| 1084 | if (np->in_ifps[1] != NULL) { |
| 1085 | COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]); |
| 1086 | } |
| 1087 | |
| 1088 | if (ipf_nat6_finalise(fin, nat) == -1) { |
| 1089 | goto badnat; |
| 1090 | } |
| 1091 | |
| 1092 | np->in_use++; |
| 1093 | |
| 1094 | if ((move == 1) && (np->in_flags & IPN_ROUNDR)) { |
| 1095 | if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) { |
| 1096 | ipf_nat6_delrdr(softn, np); |
| 1097 | ipf_nat6_addrdr(softn, np); |
| 1098 | } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) { |
| 1099 | ipf_nat6_delmap(softn, np); |
| 1100 | ipf_nat6_addmap(softn, np); |
| 1101 | } |
| 1102 | } |
| 1103 | |
| 1104 | if (flags & SI_WILDP) |
| 1105 | nsp->ns_wilds++; |
| 1106 | softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]++; |
| 1107 | |
| 1108 | goto done; |
| 1109 | badnat: |
| 1110 | NBUMPSIDE6(fin->fin_out, ns_badnatnew); |
| 1111 | if ((hm = nat->nat_hm) != NULL) |
| 1112 | ipf_nat_hostmapdel(softc, &hm); |
| 1113 | KFREE(nat); |
| 1114 | nat = NULL; |
| 1115 | done: |
| 1116 | if (nat != NULL && np != NULL) |
| 1117 | np->in_hits++; |
| 1118 | if (natsave != NULL) |
| 1119 | *natsave = nat; |
| 1120 | return nat; |
| 1121 | } |
| 1122 | |
| 1123 | |
| 1124 | /* ------------------------------------------------------------------------ */ |
| 1125 | /* Function: ipf_nat6_finalise */ |
| 1126 | /* Returns: int - 0 == sucess, -1 == failure */ |
| 1127 | /* Parameters: fin(I) - pointer to packet information */ |
| 1128 | /* nat(I) - pointer to NAT entry */ |
| 1129 | /* Write Lock: ipf_nat */ |
| 1130 | /* */ |
| 1131 | /* This is the tail end of constructing a new NAT entry and is the same */ |
| 1132 | /* for both IPv4 and IPv6. */ |
| 1133 | /* ------------------------------------------------------------------------ */ |
| 1134 | /*ARGSUSED*/ |
| 1135 | int |
| 1136 | ipf_nat6_finalise(fr_info_t *fin, nat_t *nat) |
| 1137 | { |
| 1138 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 1139 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1140 | u_32_t sum1, sum2, sumd; |
| 1141 | frentry_t *fr; |
| 1142 | |
| 1143 | switch (fin->fin_p) |
| 1144 | { |
| 1145 | case IPPROTO_ICMPV6 : |
| 1146 | sum1 = LONG_SUM6(&nat->nat_osrc6); |
| 1147 | sum1 += ntohs(nat->nat_oicmpid); |
| 1148 | sum2 = LONG_SUM6(&nat->nat_nsrc6); |
| 1149 | sum2 += ntohs(nat->nat_nicmpid); |
| 1150 | CALC_SUMD(sum1, sum2, sumd); |
| 1151 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 1152 | |
| 1153 | sum1 = LONG_SUM6(&nat->nat_odst6); |
| 1154 | sum2 = LONG_SUM6(&nat->nat_ndst6); |
| 1155 | CALC_SUMD(sum1, sum2, sumd); |
| 1156 | nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); |
| 1157 | break; |
| 1158 | |
| 1159 | case IPPROTO_TCP : |
| 1160 | case IPPROTO_UDP : |
| 1161 | sum1 = LONG_SUM6(&nat->nat_osrc6); |
| 1162 | sum1 += ntohs(nat->nat_osport); |
| 1163 | sum2 = LONG_SUM6(&nat->nat_nsrc6); |
| 1164 | sum2 += ntohs(nat->nat_nsport); |
| 1165 | CALC_SUMD(sum1, sum2, sumd); |
| 1166 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 1167 | |
| 1168 | sum1 = LONG_SUM6(&nat->nat_odst6); |
| 1169 | sum1 += ntohs(nat->nat_odport); |
| 1170 | sum2 = LONG_SUM6(&nat->nat_ndst6); |
| 1171 | sum2 += ntohs(nat->nat_ndport); |
| 1172 | CALC_SUMD(sum1, sum2, sumd); |
| 1173 | nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); |
| 1174 | break; |
| 1175 | |
| 1176 | default : |
| 1177 | sum1 = LONG_SUM6(&nat->nat_osrc6); |
| 1178 | sum2 = LONG_SUM6(&nat->nat_nsrc6); |
| 1179 | CALC_SUMD(sum1, sum2, sumd); |
| 1180 | nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); |
| 1181 | |
| 1182 | sum1 = LONG_SUM6(&nat->nat_odst6); |
| 1183 | sum2 = LONG_SUM6(&nat->nat_ndst6); |
| 1184 | CALC_SUMD(sum1, sum2, sumd); |
| 1185 | nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); |
| 1186 | break; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * Compute the partial checksum, just in case. |
| 1191 | * This is only ever placed into outbound packets so care needs |
| 1192 | * to be taken over which pair of addresses are used. |
| 1193 | */ |
| 1194 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 1195 | sum1 = LONG_SUM6(&nat->nat_nsrc6); |
| 1196 | sum1 += LONG_SUM6(&nat->nat_ndst6); |
| 1197 | } else { |
| 1198 | sum1 = LONG_SUM6(&nat->nat_osrc6); |
| 1199 | sum1 += LONG_SUM6(&nat->nat_odst6); |
| 1200 | } |
| 1201 | sum1 += nat->nat_pr[1]; |
| 1202 | nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16); |
| 1203 | |
| 1204 | if ((nat->nat_flags & SI_CLONE) == 0) |
| 1205 | nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat); |
| 1206 | |
| 1207 | if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { |
| 1208 | nat->nat_mtu[0] = GETIFMTU_6(nat->nat_ifps[0]); |
| 1209 | } |
| 1210 | |
| 1211 | if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { |
| 1212 | nat->nat_mtu[1] = GETIFMTU_6(nat->nat_ifps[1]); |
| 1213 | } |
| 1214 | |
| 1215 | nat->nat_v[0] = 6; |
| 1216 | nat->nat_v[1] = 6; |
| 1217 | |
| 1218 | if (ipf_nat6_insert(softc, softn, nat) == 0) { |
| 1219 | if (softn->ipf_nat_logging) |
| 1220 | ipf_nat_log(softc, softn, nat, NL_NEW); |
| 1221 | fr = nat->nat_fr; |
| 1222 | if (fr != NULL) { |
| 1223 | MUTEX_ENTER(&fr->fr_lock); |
| 1224 | fr->fr_ref++; |
| 1225 | MUTEX_EXIT(&fr->fr_lock); |
| 1226 | } |
| 1227 | return 0; |
| 1228 | } |
| 1229 | |
| 1230 | NBUMPSIDE6D(fin->fin_out, ns_unfinalised); |
| 1231 | /* |
| 1232 | * nat6_insert failed, so cleanup time... |
| 1233 | */ |
| 1234 | if (nat->nat_sync != NULL) |
| 1235 | ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); |
| 1236 | return -1; |
| 1237 | } |
| 1238 | |
| 1239 | |
| 1240 | /* ------------------------------------------------------------------------ */ |
| 1241 | /* Function: ipf_nat6_insert */ |
| 1242 | /* Returns: int - 0 == sucess, -1 == failure */ |
| 1243 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 1244 | /* softn(I) - pointer to NAT context structure */ |
| 1245 | /* nat(I) - pointer to NAT structure */ |
| 1246 | /* Write Lock: ipf_nat */ |
| 1247 | /* */ |
| 1248 | /* Insert a NAT entry into the hash tables for searching and add it to the */ |
| 1249 | /* list of active NAT entries. Adjust global counters when complete. */ |
| 1250 | /* ------------------------------------------------------------------------ */ |
| 1251 | static int |
| 1252 | ipf_nat6_insert(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) |
| 1253 | { |
| 1254 | u_int hv0, hv1; |
| 1255 | u_32_t sp, dp; |
| 1256 | ipnat_t *in; |
| 1257 | |
| 1258 | /* |
| 1259 | * Try and return an error as early as possible, so calculate the hash |
| 1260 | * entry numbers first and then proceed. |
| 1261 | */ |
| 1262 | if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) { |
| 1263 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 1264 | sp = nat->nat_osport; |
| 1265 | dp = nat->nat_odport; |
| 1266 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 1267 | sp = 0; |
| 1268 | dp = nat->nat_oicmpid; |
| 1269 | } else { |
| 1270 | sp = 0; |
| 1271 | dp = 0; |
| 1272 | } |
| 1273 | hv0 = NAT_HASH_FN6(&nat->nat_osrc6, sp, 0xffffffff); |
| 1274 | hv0 = NAT_HASH_FN6(&nat->nat_odst6, hv0 + dp, |
| 1275 | softn->ipf_nat_table_sz); |
| 1276 | |
| 1277 | /* |
| 1278 | * TRACE nat6_osrc6, nat6_osport, nat6_odst6, |
| 1279 | * nat6_odport, hv0 |
| 1280 | */ |
| 1281 | |
| 1282 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 1283 | sp = nat->nat_nsport; |
| 1284 | dp = nat->nat_ndport; |
| 1285 | } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { |
| 1286 | sp = 0; |
| 1287 | dp = nat->nat_nicmpid; |
| 1288 | } else { |
| 1289 | sp = 0; |
| 1290 | dp = 0; |
| 1291 | } |
| 1292 | hv1 = NAT_HASH_FN6(&nat->nat_nsrc6, sp, 0xffffffff); |
| 1293 | hv1 = NAT_HASH_FN6(&nat->nat_ndst6, hv1 + dp, |
| 1294 | softn->ipf_nat_table_sz); |
| 1295 | /* |
| 1296 | * TRACE nat6_nsrcaddr, nat6_nsport, nat6_ndstaddr, |
| 1297 | * nat6_ndport, hv0 |
| 1298 | */ |
| 1299 | } else { |
| 1300 | hv0 = NAT_HASH_FN6(&nat->nat_osrc6, 0, 0xffffffff); |
| 1301 | hv0 = NAT_HASH_FN6(&nat->nat_odst6, hv0, |
| 1302 | softn->ipf_nat_table_sz); |
| 1303 | /* TRACE nat6_osrcip6, nat6_odstip6, hv0 */ |
| 1304 | |
| 1305 | hv1 = NAT_HASH_FN6(&nat->nat_nsrc6, 0, 0xffffffff); |
| 1306 | hv1 = NAT_HASH_FN6(&nat->nat_ndst6, hv1, |
| 1307 | softn->ipf_nat_table_sz); |
| 1308 | /* TRACE nat6_nsrcip6, nat6_ndstip6, hv1 */ |
| 1309 | } |
| 1310 | |
| 1311 | if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { |
| 1312 | nat->nat_hv[0] = hv0; |
| 1313 | nat->nat_hv[1] = hv1; |
| 1314 | } else { |
| 1315 | nat->nat_hv[0] = hv1; |
| 1316 | nat->nat_hv[1] = hv0; |
| 1317 | } |
| 1318 | |
| 1319 | MUTEX_INIT(&nat->nat_lock, "nat entry lock" ); |
| 1320 | |
| 1321 | in = nat->nat_ptr; |
| 1322 | nat->nat_ref = nat->nat_me ? 2 : 1; |
| 1323 | |
| 1324 | nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0'; |
| 1325 | nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], |
| 1326 | nat->nat_v[0]); |
| 1327 | |
| 1328 | if (nat->nat_ifnames[1][0] != '\0') { |
| 1329 | nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; |
| 1330 | nat->nat_ifps[1] = ipf_resolvenic(softc, nat->nat_ifnames[1], |
| 1331 | nat->nat_v[1]); |
| 1332 | } else if (in->in_ifnames[1] != -1) { |
| 1333 | char *name; |
| 1334 | |
| 1335 | name = in->in_names + in->in_ifnames[1]; |
| 1336 | if (name[1] != '\0' && name[0] != '-' && name[0] != '*') { |
| 1337 | (void) strncpy(nat->nat_ifnames[1], |
| 1338 | nat->nat_ifnames[0], LIFNAMSIZ); |
| 1339 | nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; |
| 1340 | nat->nat_ifps[1] = nat->nat_ifps[0]; |
| 1341 | } |
| 1342 | } |
| 1343 | if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { |
| 1344 | nat->nat_mtu[0] = GETIFMTU_6(nat->nat_ifps[0]); |
| 1345 | } |
| 1346 | if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { |
| 1347 | nat->nat_mtu[1] = GETIFMTU_6(nat->nat_ifps[1]); |
| 1348 | } |
| 1349 | |
| 1350 | return ipf_nat_hashtab_add(softc, softn, nat); |
| 1351 | } |
| 1352 | |
| 1353 | |
| 1354 | /* ------------------------------------------------------------------------ */ |
| 1355 | /* Function: ipf_nat6_icmperrorlookup */ |
| 1356 | /* Returns: nat6_t* - point to matching NAT structure */ |
| 1357 | /* Parameters: fin(I) - pointer to packet information */ |
| 1358 | /* dir(I) - direction of packet (in/out) */ |
| 1359 | /* */ |
| 1360 | /* Check if the ICMP error message is related to an existing TCP, UDP or */ |
| 1361 | /* ICMP query nat entry. It is assumed that the packet is already of the */ |
| 1362 | /* the required length. */ |
| 1363 | /* ------------------------------------------------------------------------ */ |
| 1364 | nat_t * |
| 1365 | ipf_nat6_icmperrorlookup(fr_info_t *fin, int dir) |
| 1366 | { |
| 1367 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 1368 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1369 | struct icmp6_hdr *orgicmp; |
| 1370 | int flags = 0, minlen; |
| 1371 | nat_stat_side_t *nside; |
| 1372 | tcphdr_t *tcp = NULL; |
| 1373 | u_short data[2]; |
| 1374 | ip6_t *oip6; |
| 1375 | nat_t *nat; |
| 1376 | u_int p; |
| 1377 | |
| 1378 | minlen = 40; |
| 1379 | nside = &softn->ipf_nat_stats.ns_side6[fin->fin_out]; |
| 1380 | /* |
| 1381 | * Does it at least have the return (basic) IP header ? |
| 1382 | * Only a basic IP header (no options) should be with an ICMP error |
| 1383 | * header. Also, if it's not an error type, then return. |
| 1384 | */ |
| 1385 | if (!(fin->fin_flx & FI_ICMPERR)) { |
| 1386 | ATOMIC_INCL(nside->ns_icmp_basic); |
| 1387 | return NULL; |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Check packet size |
| 1392 | */ |
| 1393 | if (fin->fin_plen < ICMP6ERR_IPICMPHLEN) { |
| 1394 | ATOMIC_INCL(nside->ns_icmp_size); |
| 1395 | return NULL; |
| 1396 | } |
| 1397 | oip6 = (ip6_t *)((char *)fin->fin_dp + 8); |
| 1398 | |
| 1399 | /* |
| 1400 | * Is the buffer big enough for all of it ? It's the size of the IP |
| 1401 | * header claimed in the encapsulated part which is of concern. It |
| 1402 | * may be too big to be in this buffer but not so big that it's |
| 1403 | * outside the ICMP packet, leading to TCP deref's causing problems. |
| 1404 | * This is possible because we don't know how big oip_hl is when we |
| 1405 | * do the pullup early in ipf_check() and thus can't gaurantee it is |
| 1406 | * all here now. |
| 1407 | */ |
| 1408 | #ifdef ipf_nat6_KERNEL |
| 1409 | { |
| 1410 | mb_t *m; |
| 1411 | |
| 1412 | m = fin->fin_m; |
| 1413 | # if defined(MENTAT) |
| 1414 | if ((char *)oip6 + fin->fin_dlen - ICMPERR_ICMPHLEN > |
| 1415 | (char *)m->b_wptr) { |
| 1416 | ATOMIC_INCL(nside->ns_icmp_mbuf); |
| 1417 | return NULL; |
| 1418 | } |
| 1419 | # else |
| 1420 | if ((char *)oip6 + fin->fin_dlen - ICMPERR_ICMPHLEN > |
| 1421 | (char *)fin->fin_ip + M_LEN(m)) { |
| 1422 | ATOMIC_INCL(nside->ns_icmp_mbuf); |
| 1423 | return NULL; |
| 1424 | } |
| 1425 | # endif |
| 1426 | } |
| 1427 | #endif |
| 1428 | |
| 1429 | if (IP6_NEQ(&fin->fin_dst6, &oip6->ip6_src)) { |
| 1430 | ATOMIC_INCL(nside->ns_icmp_address); |
| 1431 | return NULL; |
| 1432 | } |
| 1433 | |
| 1434 | p = oip6->ip6_nxt; |
| 1435 | if (p == IPPROTO_TCP) |
| 1436 | flags = IPN_TCP; |
| 1437 | else if (p == IPPROTO_UDP) |
| 1438 | flags = IPN_UDP; |
| 1439 | else if (p == IPPROTO_ICMPV6) { |
| 1440 | orgicmp = (struct icmp6_hdr *)(oip6 + 1); |
| 1441 | |
| 1442 | /* see if this is related to an ICMP query */ |
| 1443 | if (ipf_nat6_icmpquerytype(orgicmp->icmp6_type)) { |
| 1444 | data[0] = fin->fin_data[0]; |
| 1445 | data[1] = fin->fin_data[1]; |
| 1446 | fin->fin_data[0] = 0; |
| 1447 | fin->fin_data[1] = orgicmp->icmp6_id; |
| 1448 | |
| 1449 | flags = IPN_ICMPERR|IPN_ICMPQUERY; |
| 1450 | /* |
| 1451 | * NOTE : dir refers to the direction of the original |
| 1452 | * ip packet. By definition the icmp error |
| 1453 | * message flows in the opposite direction. |
| 1454 | */ |
| 1455 | if (dir == NAT_INBOUND) |
| 1456 | nat = ipf_nat6_inlookup(fin, flags, p, |
| 1457 | &oip6->ip6_dst, |
| 1458 | &oip6->ip6_src); |
| 1459 | else |
| 1460 | nat = ipf_nat6_outlookup(fin, flags, p, |
| 1461 | &oip6->ip6_dst, |
| 1462 | &oip6->ip6_src); |
| 1463 | fin->fin_data[0] = data[0]; |
| 1464 | fin->fin_data[1] = data[1]; |
| 1465 | return nat; |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | if (flags & IPN_TCPUDP) { |
| 1470 | minlen += 8; /* + 64bits of data to get ports */ |
| 1471 | /* TRACE (fin,minlen) */ |
| 1472 | if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) { |
| 1473 | ATOMIC_INCL(nside->ns_icmp_short); |
| 1474 | return NULL; |
| 1475 | } |
| 1476 | |
| 1477 | data[0] = fin->fin_data[0]; |
| 1478 | data[1] = fin->fin_data[1]; |
| 1479 | tcp = (tcphdr_t *)(oip6 + 1); |
| 1480 | fin->fin_data[0] = ntohs(tcp->th_dport); |
| 1481 | fin->fin_data[1] = ntohs(tcp->th_sport); |
| 1482 | |
| 1483 | if (dir == NAT_INBOUND) { |
| 1484 | nat = ipf_nat6_inlookup(fin, flags, p, &oip6->ip6_dst, |
| 1485 | &oip6->ip6_src); |
| 1486 | } else { |
| 1487 | nat = ipf_nat6_outlookup(fin, flags, p, &oip6->ip6_dst, |
| 1488 | &oip6->ip6_src); |
| 1489 | } |
| 1490 | fin->fin_data[0] = data[0]; |
| 1491 | fin->fin_data[1] = data[1]; |
| 1492 | return nat; |
| 1493 | } |
| 1494 | if (dir == NAT_INBOUND) |
| 1495 | nat = ipf_nat6_inlookup(fin, 0, p, &oip6->ip6_dst, |
| 1496 | &oip6->ip6_src); |
| 1497 | else |
| 1498 | nat = ipf_nat6_outlookup(fin, 0, p, &oip6->ip6_dst, |
| 1499 | &oip6->ip6_src); |
| 1500 | |
| 1501 | return nat; |
| 1502 | } |
| 1503 | |
| 1504 | |
| 1505 | /* result = ip1 - ip2 */ |
| 1506 | u_32_t |
| 1507 | ipf_nat6_ip6subtract(i6addr_t *ip1, i6addr_t *ip2) |
| 1508 | { |
| 1509 | i6addr_t l1, l2, d; |
| 1510 | u_short *s1, *s2, *ds; |
| 1511 | u_32_t r; |
| 1512 | int i; |
| 1513 | |
| 1514 | l1 = *ip1; |
| 1515 | l2 = *ip2; |
| 1516 | s1 = (u_short *)&l1; |
| 1517 | s2 = (u_short *)&l2; |
| 1518 | ds = (u_short *)&d; |
| 1519 | |
| 1520 | for (i = 7; i > 0; i--) { |
| 1521 | if (s1[i] > s2[i]) { |
| 1522 | ds[i] = s2[i] + 0x10000 - s1[i]; |
| 1523 | s2[i - 1] += 0x10000; |
| 1524 | } else { |
| 1525 | ds[i] = s2[i] - s1[i]; |
| 1526 | } |
| 1527 | } |
| 1528 | if (s2[0] > s1[0]) { |
| 1529 | ds[0] = s2[0] + 0x10000 - s1[0]; |
| 1530 | } else { |
| 1531 | ds[0] = s2[0] - s1[0]; |
| 1532 | } |
| 1533 | |
| 1534 | for (i = 0, r = 0; i < 8; i++) { |
| 1535 | r += ds[i]; |
| 1536 | } |
| 1537 | |
| 1538 | return r; |
| 1539 | } |
| 1540 | |
| 1541 | |
| 1542 | /* ------------------------------------------------------------------------ */ |
| 1543 | /* Function: ipf_nat6_icmperror */ |
| 1544 | /* Returns: nat6_t* - point to matching NAT structure */ |
| 1545 | /* Parameters: fin(I) - pointer to packet information */ |
| 1546 | /* nflags(I) - NAT flags for this packet */ |
| 1547 | /* dir(I) - direction of packet (in/out) */ |
| 1548 | /* */ |
| 1549 | /* Fix up an ICMP packet which is an error message for an existing NAT */ |
| 1550 | /* session. This will correct both packet header data and checksums. */ |
| 1551 | /* */ |
| 1552 | /* This should *ONLY* be used for incoming ICMP error packets to make sure */ |
| 1553 | /* a NAT'd ICMP packet gets correctly recognised. */ |
| 1554 | /* ------------------------------------------------------------------------ */ |
| 1555 | nat_t * |
| 1556 | ipf_nat6_icmperror(fr_info_t *fin, u_int *nflags, int dir) |
| 1557 | { |
| 1558 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 1559 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1560 | u_32_t sum1, sum2, sumd, sumd2; |
| 1561 | i6addr_t a1, a2, a3, a4; |
| 1562 | struct icmp6_hdr *icmp6; |
| 1563 | int flags, dlen, odst; |
| 1564 | u_short *csump; |
| 1565 | tcphdr_t *tcp; |
| 1566 | ip6_t *oip6; |
| 1567 | nat_t *nat; |
| 1568 | void *dp; |
| 1569 | |
| 1570 | if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { |
| 1571 | NBUMPSIDE6D(fin->fin_out, ns_icmp_short); |
| 1572 | return NULL; |
| 1573 | } |
| 1574 | |
| 1575 | /* |
| 1576 | * ipf_nat6_icmperrorlookup() will return NULL for `defective' packets. |
| 1577 | */ |
| 1578 | if ((fin->fin_v != 6) || !(nat = ipf_nat6_icmperrorlookup(fin, dir))) { |
| 1579 | NBUMPSIDE6D(fin->fin_out, ns_icmp_notfound); |
| 1580 | return NULL; |
| 1581 | } |
| 1582 | |
| 1583 | tcp = NULL; |
| 1584 | csump = NULL; |
| 1585 | flags = 0; |
| 1586 | sumd2 = 0; |
| 1587 | *nflags = IPN_ICMPERR; |
| 1588 | icmp6 = fin->fin_dp; |
| 1589 | oip6 = (ip6_t *)((u_char *)icmp6 + sizeof(*icmp6)); |
| 1590 | dp = (u_char *)oip6 + sizeof(*oip6); |
| 1591 | if (oip6->ip6_nxt == IPPROTO_TCP) { |
| 1592 | tcp = (tcphdr_t *)dp; |
| 1593 | csump = (u_short *)&tcp->th_sum; |
| 1594 | flags = IPN_TCP; |
| 1595 | } else if (oip6->ip6_nxt == IPPROTO_UDP) { |
| 1596 | udphdr_t *udp; |
| 1597 | |
| 1598 | udp = (udphdr_t *)dp; |
| 1599 | tcp = (tcphdr_t *)dp; |
| 1600 | csump = (u_short *)&udp->uh_sum; |
| 1601 | flags = IPN_UDP; |
| 1602 | } else if (oip6->ip6_nxt == IPPROTO_ICMPV6) |
| 1603 | flags = IPN_ICMPQUERY; |
| 1604 | dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip); |
| 1605 | |
| 1606 | /* |
| 1607 | * Need to adjust ICMP header to include the real IP#'s and |
| 1608 | * port #'s. Only apply a checksum change relative to the |
| 1609 | * IP address change as it will be modified again in ipf_nat6_checkout |
| 1610 | * for both address and port. Two checksum changes are |
| 1611 | * necessary for the two header address changes. Be careful |
| 1612 | * to only modify the checksum once for the port # and twice |
| 1613 | * for the IP#. |
| 1614 | */ |
| 1615 | |
| 1616 | /* |
| 1617 | * Step 1 |
| 1618 | * Fix the IP addresses in the offending IP packet. You also need |
| 1619 | * to adjust the IP header checksum of that offending IP packet. |
| 1620 | * |
| 1621 | * Normally, you would expect that the ICMP checksum of the |
| 1622 | * ICMP error message needs to be adjusted as well for the |
| 1623 | * IP address change in oip. |
| 1624 | * However, this is a NOP, because the ICMP checksum is |
| 1625 | * calculated over the complete ICMP packet, which includes the |
| 1626 | * changed oip IP addresses and oip6->ip6_sum. However, these |
| 1627 | * two changes cancel each other out (if the delta for |
| 1628 | * the IP address is x, then the delta for ip_sum is minus x), |
| 1629 | * so no change in the icmp_cksum is necessary. |
| 1630 | * |
| 1631 | * Inbound ICMP |
| 1632 | * ------------ |
| 1633 | * MAP rule, SRC=a,DST=b -> SRC=c,DST=b |
| 1634 | * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b) |
| 1635 | * - OIP_SRC(c)=nat6_newsrcip, OIP_DST(b)=nat6_newdstip |
| 1636 | *=> OIP_SRC(c)=nat6_oldsrcip, OIP_DST(b)=nat6_olddstip |
| 1637 | * |
| 1638 | * RDR rule, SRC=a,DST=b -> SRC=a,DST=c |
| 1639 | * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 1640 | * - OIP_SRC(b)=nat6_olddstip, OIP_DST(a)=nat6_oldsrcip |
| 1641 | *=> OIP_SRC(b)=nat6_newdstip, OIP_DST(a)=nat6_newsrcip |
| 1642 | * |
| 1643 | * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d |
| 1644 | * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d) |
| 1645 | * - OIP_SRC(c)=nat6_newsrcip, OIP_DST(d)=nat6_newdstip |
| 1646 | *=> OIP_SRC(c)=nat6_oldsrcip, OIP_DST(d)=nat6_olddstip |
| 1647 | * |
| 1648 | * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d |
| 1649 | * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 1650 | * - OIP_SRC(b)=nat6_olddstip, OIP_DST(a)=nat6_oldsrcip |
| 1651 | *=> OIP_SRC(b)=nat6_newdstip, OIP_DST(a)=nat6_newsrcip |
| 1652 | * |
| 1653 | * Outbound ICMP |
| 1654 | * ------------- |
| 1655 | * MAP rule, SRC=a,DST=b -> SRC=c,DST=b |
| 1656 | * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) |
| 1657 | * - OIP_SRC(b)=nat6_olddstip, OIP_DST(a)=nat6_oldsrcip |
| 1658 | *=> OIP_SRC(b)=nat6_newdstip, OIP_DST(a)=nat6_newsrcip |
| 1659 | * |
| 1660 | * RDR rule, SRC=a,DST=b -> SRC=a,DST=c |
| 1661 | * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c) |
| 1662 | * - OIP_SRC(a)=nat6_newsrcip, OIP_DST(c)=nat6_newdstip |
| 1663 | *=> OIP_SRC(a)=nat6_oldsrcip, OIP_DST(c)=nat6_olddstip |
| 1664 | * |
| 1665 | * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d |
| 1666 | * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d) |
| 1667 | * - OIP_SRC(c)=nat6_olddstip, OIP_DST(d)=nat6_oldsrcip |
| 1668 | *=> OIP_SRC(b)=nat6_newdstip, OIP_DST(a)=nat6_newsrcip |
| 1669 | * |
| 1670 | * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d |
| 1671 | * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a) |
| 1672 | * - OIP_SRC(b)=nat6_newsrcip, OIP_DST(a)=nat6_newdstip |
| 1673 | *=> OIP_SRC(a)=nat6_oldsrcip, OIP_DST(c)=nat6_olddstip |
| 1674 | */ |
| 1675 | |
| 1676 | if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) || |
| 1677 | ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) { |
| 1678 | a1 = nat->nat_osrc6; |
| 1679 | a4.in6 = oip6->ip6_src; |
| 1680 | a3 = nat->nat_odst6; |
| 1681 | a2.in6 = oip6->ip6_dst; |
| 1682 | oip6->ip6_src = a1.in6; |
| 1683 | oip6->ip6_dst = a3.in6; |
| 1684 | odst = 1; |
| 1685 | } else { |
| 1686 | a1 = nat->nat_ndst6; |
| 1687 | a2.in6 = oip6->ip6_dst; |
| 1688 | a3 = nat->nat_nsrc6; |
| 1689 | a4.in6 = oip6->ip6_src; |
| 1690 | oip6->ip6_dst = a3.in6; |
| 1691 | oip6->ip6_src = a1.in6; |
| 1692 | odst = 0; |
| 1693 | } |
| 1694 | |
| 1695 | sumd = 0; |
| 1696 | if (IP6_NEQ(&a3, &a2) || IP6_NEQ(&a1, &a4)) { |
| 1697 | if (IP6_GT(&a3, &a2)) { |
| 1698 | sumd = ipf_nat6_ip6subtract(&a2, &a3); |
| 1699 | sumd--; |
| 1700 | } else { |
| 1701 | sumd = ipf_nat6_ip6subtract(&a2, &a3); |
| 1702 | } |
| 1703 | if (IP6_GT(&a1, &a4)) { |
| 1704 | sumd += ipf_nat6_ip6subtract(&a4, &a1); |
| 1705 | sumd--; |
| 1706 | } else { |
| 1707 | sumd += ipf_nat6_ip6subtract(&a4, &a1); |
| 1708 | } |
| 1709 | sumd = ~sumd; |
| 1710 | } |
| 1711 | |
| 1712 | sumd2 = sumd; |
| 1713 | sum1 = 0; |
| 1714 | sum2 = 0; |
| 1715 | |
| 1716 | /* |
| 1717 | * Fix UDP pseudo header checksum to compensate for the |
| 1718 | * IP address change. |
| 1719 | */ |
| 1720 | if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) { |
| 1721 | u_32_t sum3, sum4; |
| 1722 | /* |
| 1723 | * Step 2 : |
| 1724 | * For offending TCP/UDP IP packets, translate the ports as |
| 1725 | * well, based on the NAT specification. Of course such |
| 1726 | * a change may be reflected in the ICMP checksum as well. |
| 1727 | * |
| 1728 | * Since the port fields are part of the TCP/UDP checksum |
| 1729 | * of the offending IP packet, you need to adjust that checksum |
| 1730 | * as well... except that the change in the port numbers should |
| 1731 | * be offset by the checksum change. However, the TCP/UDP |
| 1732 | * checksum will also need to change if there has been an |
| 1733 | * IP address change. |
| 1734 | */ |
| 1735 | if (odst == 1) { |
| 1736 | sum1 = ntohs(nat->nat_osport); |
| 1737 | sum4 = ntohs(tcp->th_sport); |
| 1738 | sum3 = ntohs(nat->nat_odport); |
| 1739 | sum2 = ntohs(tcp->th_dport); |
| 1740 | |
| 1741 | tcp->th_sport = htons(sum1); |
| 1742 | tcp->th_dport = htons(sum3); |
| 1743 | } else { |
| 1744 | sum1 = ntohs(nat->nat_ndport); |
| 1745 | sum2 = ntohs(tcp->th_dport); |
| 1746 | sum3 = ntohs(nat->nat_nsport); |
| 1747 | sum4 = ntohs(tcp->th_sport); |
| 1748 | |
| 1749 | tcp->th_dport = htons(sum3); |
| 1750 | tcp->th_sport = htons(sum1); |
| 1751 | } |
| 1752 | sumd += sum1 - sum4; |
| 1753 | sumd += sum3 - sum2; |
| 1754 | |
| 1755 | if (sumd != 0 || sumd2 != 0) { |
| 1756 | /* |
| 1757 | * At this point, sumd is the delta to apply to the |
| 1758 | * TCP/UDP header, given the changes in both the IP |
| 1759 | * address and the ports and sumd2 is the delta to |
| 1760 | * apply to the ICMP header, given the IP address |
| 1761 | * change delta that may need to be applied to the |
| 1762 | * TCP/UDP checksum instead. |
| 1763 | * |
| 1764 | * If we will both the IP and TCP/UDP checksums |
| 1765 | * then the ICMP checksum changes by the address |
| 1766 | * delta applied to the TCP/UDP checksum. If we |
| 1767 | * do not change the TCP/UDP checksum them we |
| 1768 | * apply the delta in ports to the ICMP checksum. |
| 1769 | */ |
| 1770 | if (oip6->ip6_nxt == IPPROTO_UDP) { |
| 1771 | if ((dlen >= 8) && (*csump != 0)) { |
| 1772 | ipf_fix_datacksum(csump, sumd); |
| 1773 | } else { |
| 1774 | sumd2 = sum4 - sum1; |
| 1775 | if (sum1 > sum4) |
| 1776 | sumd2--; |
| 1777 | sumd2 += sum2 - sum3; |
| 1778 | if (sum3 > sum2) |
| 1779 | sumd2--; |
| 1780 | } |
| 1781 | } else if (oip6->ip6_nxt == IPPROTO_TCP) { |
| 1782 | if (dlen >= 18) { |
| 1783 | ipf_fix_datacksum(csump, sumd); |
| 1784 | } else { |
| 1785 | sumd2 = sum4 - sum1; |
| 1786 | if (sum1 > sum4) |
| 1787 | sumd2--; |
| 1788 | sumd2 += sum2 - sum3; |
| 1789 | if (sum3 > sum2) |
| 1790 | sumd2--; |
| 1791 | } |
| 1792 | } |
| 1793 | if (sumd2 != 0) { |
| 1794 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 1795 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 1796 | sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); |
| 1797 | ipf_fix_incksum(0, &icmp6->icmp6_cksum, |
| 1798 | sumd2, 0); |
| 1799 | } |
| 1800 | } |
| 1801 | } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) { |
| 1802 | struct icmp6_hdr *orgicmp; |
| 1803 | |
| 1804 | /* |
| 1805 | * XXX - what if this is bogus hl and we go off the end ? |
| 1806 | * In this case, ipf_nat6_icmperrorlookup() will have |
| 1807 | * returned NULL. |
| 1808 | */ |
| 1809 | orgicmp = (struct icmp6_hdr *)dp; |
| 1810 | |
| 1811 | if (odst == 1) { |
| 1812 | if (orgicmp->icmp6_id != nat->nat_osport) { |
| 1813 | |
| 1814 | /* |
| 1815 | * Fix ICMP checksum (of the offening ICMP |
| 1816 | * query packet) to compensate the change |
| 1817 | * in the ICMP id of the offending ICMP |
| 1818 | * packet. |
| 1819 | * |
| 1820 | * Since you modify orgicmp->icmp6_id with |
| 1821 | * a delta (say x) and you compensate that |
| 1822 | * in origicmp->icmp6_cksum with a delta |
| 1823 | * minus x, you don't have to adjust the |
| 1824 | * overall icmp->icmp6_cksum |
| 1825 | */ |
| 1826 | sum1 = ntohs(orgicmp->icmp6_id); |
| 1827 | sum2 = ntohs(nat->nat_osport); |
| 1828 | CALC_SUMD(sum1, sum2, sumd); |
| 1829 | orgicmp->icmp6_id = nat->nat_oicmpid; |
| 1830 | ipf_fix_datacksum(&orgicmp->icmp6_cksum, sumd); |
| 1831 | } |
| 1832 | } /* nat6_dir == NAT_INBOUND is impossible for icmp queries */ |
| 1833 | } |
| 1834 | return nat; |
| 1835 | } |
| 1836 | |
| 1837 | |
| 1838 | /* |
| 1839 | * MAP-IN MAP-OUT RDR-IN RDR-OUT |
| 1840 | * osrc X == src == src X |
| 1841 | * odst X == dst == dst X |
| 1842 | * nsrc == dst X X == dst |
| 1843 | * ndst == src X X == src |
| 1844 | * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND |
| 1845 | */ |
| 1846 | /* |
| 1847 | * NB: these lookups don't lock access to the list, it assumed that it has |
| 1848 | * already been done! |
| 1849 | */ |
| 1850 | /* ------------------------------------------------------------------------ */ |
| 1851 | /* Function: ipf_nat6_inlookup */ |
| 1852 | /* Returns: nat6_t* - NULL == no match, */ |
| 1853 | /* else pointer to matching NAT entry */ |
| 1854 | /* Parameters: fin(I) - pointer to packet information */ |
| 1855 | /* flags(I) - NAT flags for this packet */ |
| 1856 | /* p(I) - protocol for this packet */ |
| 1857 | /* src(I) - source IP address */ |
| 1858 | /* mapdst(I) - destination IP address */ |
| 1859 | /* */ |
| 1860 | /* Lookup a nat entry based on the mapped destination ip address/port and */ |
| 1861 | /* real source address/port. We use this lookup when receiving a packet, */ |
| 1862 | /* we're looking for a table entry, based on the destination address. */ |
| 1863 | /* */ |
| 1864 | /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ |
| 1865 | /* */ |
| 1866 | /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ |
| 1867 | /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ |
| 1868 | /* */ |
| 1869 | /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ |
| 1870 | /* the packet is of said protocol */ |
| 1871 | /* ------------------------------------------------------------------------ */ |
| 1872 | nat_t * |
| 1873 | ipf_nat6_inlookup(fr_info_t *fin, u_int flags, u_int p, struct in6_addr *src, |
| 1874 | struct in6_addr *mapdst) |
| 1875 | { |
| 1876 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 1877 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 1878 | u_short sport, dport; |
| 1879 | nat_t *nat; |
| 1880 | int nflags; |
| 1881 | i6addr_t dst; |
| 1882 | void *ifp; |
| 1883 | u_int hv; |
| 1884 | |
| 1885 | ifp = fin->fin_ifp; |
| 1886 | sport = 0; |
| 1887 | dport = 0; |
| 1888 | dst.in6 = *mapdst; |
| 1889 | |
| 1890 | switch (p) |
| 1891 | { |
| 1892 | case IPPROTO_TCP : |
| 1893 | case IPPROTO_UDP : |
| 1894 | sport = htons(fin->fin_data[0]); |
| 1895 | dport = htons(fin->fin_data[1]); |
| 1896 | break; |
| 1897 | case IPPROTO_ICMPV6 : |
| 1898 | if (flags & IPN_ICMPERR) |
| 1899 | sport = fin->fin_data[1]; |
| 1900 | else |
| 1901 | dport = fin->fin_data[1]; |
| 1902 | break; |
| 1903 | default : |
| 1904 | break; |
| 1905 | } |
| 1906 | |
| 1907 | |
| 1908 | if ((flags & SI_WILDP) != 0) |
| 1909 | goto find_in_wild_ports; |
| 1910 | |
| 1911 | hv = NAT_HASH_FN6(&dst, dport, 0xffffffff); |
| 1912 | hv = NAT_HASH_FN6(src, hv + sport, softn->ipf_nat_table_sz); |
| 1913 | nat = softn->ipf_nat_table[1][hv]; |
| 1914 | /* TRACE dst, dport, src, sport, hv, nat */ |
| 1915 | |
| 1916 | for (; nat; nat = nat->nat_hnext[1]) { |
| 1917 | if (nat->nat_ifps[0] != NULL) { |
| 1918 | if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) |
| 1919 | continue; |
| 1920 | } |
| 1921 | |
| 1922 | if (nat->nat_pr[0] != p) |
| 1923 | continue; |
| 1924 | |
| 1925 | switch (nat->nat_dir) |
| 1926 | { |
| 1927 | case NAT_INBOUND : |
| 1928 | if (nat->nat_v[0] != 6) |
| 1929 | continue; |
| 1930 | if (IP6_NEQ(&nat->nat_osrc6, src) || |
| 1931 | IP6_NEQ(&nat->nat_odst6, &dst)) |
| 1932 | continue; |
| 1933 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 1934 | if (nat->nat_osport != sport) |
| 1935 | continue; |
| 1936 | if (nat->nat_odport != dport) |
| 1937 | continue; |
| 1938 | |
| 1939 | } else if (p == IPPROTO_ICMPV6) { |
| 1940 | if (nat->nat_osport != dport) { |
| 1941 | continue; |
| 1942 | } |
| 1943 | } |
| 1944 | break; |
| 1945 | case NAT_OUTBOUND : |
| 1946 | if (nat->nat_v[1] != 6) |
| 1947 | continue; |
| 1948 | if (IP6_NEQ(&nat->nat_ndst6, src) || |
| 1949 | IP6_NEQ(&nat->nat_nsrc6, &dst)) |
| 1950 | continue; |
| 1951 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 1952 | if (nat->nat_ndport != sport) |
| 1953 | continue; |
| 1954 | if (nat->nat_nsport != dport) |
| 1955 | continue; |
| 1956 | |
| 1957 | } else if (p == IPPROTO_ICMPV6) { |
| 1958 | if (nat->nat_osport != dport) { |
| 1959 | continue; |
| 1960 | } |
| 1961 | } |
| 1962 | break; |
| 1963 | } |
| 1964 | |
| 1965 | |
| 1966 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 1967 | #ifdef IPF_V6_PROXIES |
| 1968 | if ((nat->nat_ptr != NULL) && (nat->nat_aps != NULL)) |
| 1969 | if (appr_match(fin, nat) != 0) |
| 1970 | continue; |
| 1971 | #endif |
| 1972 | } |
| 1973 | if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { |
| 1974 | nat->nat_ifps[0] = ifp; |
| 1975 | nat->nat_mtu[0] = GETIFMTU_6(ifp); |
| 1976 | } |
| 1977 | return nat; |
| 1978 | } |
| 1979 | |
| 1980 | /* |
| 1981 | * So if we didn't find it but there are wildcard members in the hash |
| 1982 | * table, go back and look for them. We do this search and update here |
| 1983 | * because it is modifying the NAT table and we want to do this only |
| 1984 | * for the first packet that matches. The exception, of course, is |
| 1985 | * for "dummy" (FI_IGNORE) lookups. |
| 1986 | */ |
| 1987 | find_in_wild_ports: |
| 1988 | if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { |
| 1989 | NBUMPSIDE6DX(0, ns_lookup_miss, ns_lookup_miss_1); |
| 1990 | return NULL; |
| 1991 | } |
| 1992 | if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { |
| 1993 | NBUMPSIDE6D(0, ns_lookup_nowild); |
| 1994 | return NULL; |
| 1995 | } |
| 1996 | |
| 1997 | RWLOCK_EXIT(&softc->ipf_nat); |
| 1998 | |
| 1999 | hv = NAT_HASH_FN6(&dst, 0, 0xffffffff); |
| 2000 | hv = NAT_HASH_FN6(src, hv, softn->ipf_nat_table_sz); |
| 2001 | WRITE_ENTER(&softc->ipf_nat); |
| 2002 | |
| 2003 | nat = softn->ipf_nat_table[1][hv]; |
| 2004 | /* TRACE dst, src, hv, nat */ |
| 2005 | for (; nat; nat = nat->nat_hnext[1]) { |
| 2006 | if (nat->nat_ifps[0] != NULL) { |
| 2007 | if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) |
| 2008 | continue; |
| 2009 | } |
| 2010 | |
| 2011 | if (nat->nat_pr[0] != fin->fin_p) |
| 2012 | continue; |
| 2013 | |
| 2014 | switch (nat->nat_dir) |
| 2015 | { |
| 2016 | case NAT_INBOUND : |
| 2017 | if (nat->nat_v[0] != 6) |
| 2018 | continue; |
| 2019 | if (IP6_NEQ(&nat->nat_osrc6, src) || |
| 2020 | IP6_NEQ(&nat->nat_odst6, &dst)) |
| 2021 | continue; |
| 2022 | break; |
| 2023 | case NAT_OUTBOUND : |
| 2024 | if (nat->nat_v[1] != 6) |
| 2025 | continue; |
| 2026 | if (IP6_NEQ(&nat->nat_ndst6, src) || |
| 2027 | IP6_NEQ(&nat->nat_nsrc6, &dst)) |
| 2028 | continue; |
| 2029 | break; |
| 2030 | } |
| 2031 | |
| 2032 | nflags = nat->nat_flags; |
| 2033 | if (!(nflags & (NAT_TCPUDP|SI_WILDP))) |
| 2034 | continue; |
| 2035 | |
| 2036 | if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags, |
| 2037 | NAT_INBOUND) == 1) { |
| 2038 | if ((fin->fin_flx & FI_IGNORE) != 0) |
| 2039 | break; |
| 2040 | if ((nflags & SI_CLONE) != 0) { |
| 2041 | nat = ipf_nat_clone(fin, nat); |
| 2042 | if (nat == NULL) |
| 2043 | break; |
| 2044 | } else { |
| 2045 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 2046 | softn->ipf_nat_stats.ns_wilds--; |
| 2047 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 2048 | } |
| 2049 | |
| 2050 | if (nat->nat_dir == NAT_INBOUND) { |
| 2051 | if (nat->nat_osport == 0) { |
| 2052 | nat->nat_osport = sport; |
| 2053 | nat->nat_nsport = sport; |
| 2054 | } |
| 2055 | if (nat->nat_odport == 0) { |
| 2056 | nat->nat_odport = dport; |
| 2057 | nat->nat_ndport = dport; |
| 2058 | } |
| 2059 | } else { |
| 2060 | if (nat->nat_osport == 0) { |
| 2061 | nat->nat_osport = dport; |
| 2062 | nat->nat_nsport = dport; |
| 2063 | } |
| 2064 | if (nat->nat_odport == 0) { |
| 2065 | nat->nat_odport = sport; |
| 2066 | nat->nat_ndport = sport; |
| 2067 | } |
| 2068 | } |
| 2069 | if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { |
| 2070 | nat->nat_ifps[0] = ifp; |
| 2071 | nat->nat_mtu[0] = GETIFMTU_6(ifp); |
| 2072 | } |
| 2073 | nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); |
| 2074 | ipf_nat6_tabmove(softn, nat); |
| 2075 | break; |
| 2076 | } |
| 2077 | } |
| 2078 | |
| 2079 | MUTEX_DOWNGRADE(&softc->ipf_nat); |
| 2080 | |
| 2081 | if (nat == NULL) { |
| 2082 | NBUMPSIDE6DX(0, ns_lookup_miss, ns_lookup_miss_2); |
| 2083 | } |
| 2084 | return nat; |
| 2085 | } |
| 2086 | |
| 2087 | |
| 2088 | /* ------------------------------------------------------------------------ */ |
| 2089 | /* Function: ipf_nat6_tabmove */ |
| 2090 | /* Returns: Nil */ |
| 2091 | /* Parameters: nat(I) - pointer to NAT structure */ |
| 2092 | /* Write Lock: ipf_nat */ |
| 2093 | /* */ |
| 2094 | /* This function is only called for TCP/UDP NAT table entries where the */ |
| 2095 | /* original was placed in the table without hashing on the ports and we now */ |
| 2096 | /* want to include hashing on port numbers. */ |
| 2097 | /* ------------------------------------------------------------------------ */ |
| 2098 | static void |
| 2099 | ipf_nat6_tabmove(ipf_nat_softc_t *softn, nat_t *nat) |
| 2100 | { |
| 2101 | u_int rhv0, rhv1, hv0, hv1; |
| 2102 | nat_t **natp; |
| 2103 | |
| 2104 | if (nat->nat_flags & SI_CLONE) |
| 2105 | return; |
| 2106 | |
| 2107 | /* |
| 2108 | * Remove the NAT entry from the old location |
| 2109 | */ |
| 2110 | if (nat->nat_hnext[0]) |
| 2111 | nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; |
| 2112 | *nat->nat_phnext[0] = nat->nat_hnext[0]; |
| 2113 | softn->ipf_nat_stats.ns_side[0].ns_bucketlen[nat->nat_hv[0]]--; |
| 2114 | |
| 2115 | if (nat->nat_hnext[1]) |
| 2116 | nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; |
| 2117 | *nat->nat_phnext[1] = nat->nat_hnext[1]; |
| 2118 | softn->ipf_nat_stats.ns_side[1].ns_bucketlen[nat->nat_hv[1]]--; |
| 2119 | |
| 2120 | /* |
| 2121 | * Add into the NAT table in the new position |
| 2122 | */ |
| 2123 | rhv0 = NAT_HASH_FN6(&nat->nat_osrc6, nat->nat_osport, 0xffffffff); |
| 2124 | rhv0 = NAT_HASH_FN6(&nat->nat_odst6, rhv0 + nat->nat_odport, |
| 2125 | softn->ipf_nat_table_sz); |
| 2126 | rhv1 = NAT_HASH_FN6(&nat->nat_nsrc6, nat->nat_nsport, 0xffffffff); |
| 2127 | rhv1 = NAT_HASH_FN6(&nat->nat_ndst6, rhv1 + nat->nat_ndport, |
| 2128 | softn->ipf_nat_table_sz); |
| 2129 | |
| 2130 | if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { |
| 2131 | nat->nat_hv[0] = rhv0; |
| 2132 | nat->nat_hv[1] = rhv1; |
| 2133 | } else { |
| 2134 | nat->nat_hv[0] = rhv1; |
| 2135 | nat->nat_hv[1] = rhv0; |
| 2136 | } |
| 2137 | |
| 2138 | hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; |
| 2139 | hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; |
| 2140 | |
| 2141 | /* TRACE nat_osrc6, nat_osport, nat_odst6, nat_odport, hv0 */ |
| 2142 | /* TRACE nat_nsrc6, nat_nsport, nat_ndst6, nat_ndport, hv1 */ |
| 2143 | |
| 2144 | natp = &softn->ipf_nat_table[0][hv0]; |
| 2145 | if (*natp) |
| 2146 | (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; |
| 2147 | nat->nat_phnext[0] = natp; |
| 2148 | nat->nat_hnext[0] = *natp; |
| 2149 | *natp = nat; |
| 2150 | softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]++; |
| 2151 | |
| 2152 | natp = &softn->ipf_nat_table[1][hv1]; |
| 2153 | if (*natp) |
| 2154 | (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; |
| 2155 | nat->nat_phnext[1] = natp; |
| 2156 | nat->nat_hnext[1] = *natp; |
| 2157 | *natp = nat; |
| 2158 | softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]++; |
| 2159 | } |
| 2160 | |
| 2161 | |
| 2162 | /* ------------------------------------------------------------------------ */ |
| 2163 | /* Function: ipf_nat6_outlookup */ |
| 2164 | /* Returns: nat6_t* - NULL == no match, */ |
| 2165 | /* else pointer to matching NAT entry */ |
| 2166 | /* Parameters: fin(I) - pointer to packet information */ |
| 2167 | /* flags(I) - NAT flags for this packet */ |
| 2168 | /* p(I) - protocol for this packet */ |
| 2169 | /* src(I) - source IP address */ |
| 2170 | /* dst(I) - destination IP address */ |
| 2171 | /* rw(I) - 1 == write lock on held, 0 == read lock. */ |
| 2172 | /* */ |
| 2173 | /* Lookup a nat entry based on the source 'real' ip address/port and */ |
| 2174 | /* destination address/port. We use this lookup when sending a packet out, */ |
| 2175 | /* we're looking for a table entry, based on the source address. */ |
| 2176 | /* */ |
| 2177 | /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ |
| 2178 | /* */ |
| 2179 | /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ |
| 2180 | /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ |
| 2181 | /* */ |
| 2182 | /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ |
| 2183 | /* the packet is of said protocol */ |
| 2184 | /* ------------------------------------------------------------------------ */ |
| 2185 | nat_t * |
| 2186 | ipf_nat6_outlookup(fr_info_t *fin, u_int flags, u_int p, struct in6_addr *src, |
| 2187 | struct in6_addr *dst) |
| 2188 | { |
| 2189 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2190 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2191 | u_short sport, dport; |
| 2192 | nat_t *nat; |
| 2193 | void *ifp; |
| 2194 | u_int hv; |
| 2195 | |
| 2196 | ifp = fin->fin_ifp; |
| 2197 | sport = 0; |
| 2198 | dport = 0; |
| 2199 | |
| 2200 | switch (p) |
| 2201 | { |
| 2202 | case IPPROTO_TCP : |
| 2203 | case IPPROTO_UDP : |
| 2204 | sport = htons(fin->fin_data[0]); |
| 2205 | dport = htons(fin->fin_data[1]); |
| 2206 | break; |
| 2207 | case IPPROTO_ICMPV6 : |
| 2208 | if (flags & IPN_ICMPERR) |
| 2209 | sport = fin->fin_data[1]; |
| 2210 | else |
| 2211 | dport = fin->fin_data[1]; |
| 2212 | break; |
| 2213 | default : |
| 2214 | break; |
| 2215 | } |
| 2216 | |
| 2217 | if ((flags & SI_WILDP) != 0) |
| 2218 | goto find_out_wild_ports; |
| 2219 | |
| 2220 | hv = NAT_HASH_FN6(src, sport, 0xffffffff); |
| 2221 | hv = NAT_HASH_FN6(dst, hv + dport, softn->ipf_nat_table_sz); |
| 2222 | nat = softn->ipf_nat_table[0][hv]; |
| 2223 | |
| 2224 | /* TRACE src, sport, dst, dport, hv, nat */ |
| 2225 | |
| 2226 | for (; nat; nat = nat->nat_hnext[0]) { |
| 2227 | if (nat->nat_ifps[1] != NULL) { |
| 2228 | if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) |
| 2229 | continue; |
| 2230 | } |
| 2231 | |
| 2232 | if (nat->nat_pr[1] != p) |
| 2233 | continue; |
| 2234 | |
| 2235 | switch (nat->nat_dir) |
| 2236 | { |
| 2237 | case NAT_INBOUND : |
| 2238 | if (nat->nat_v[1] != 6) |
| 2239 | continue; |
| 2240 | if (IP6_NEQ(&nat->nat_ndst6, src) || |
| 2241 | IP6_NEQ(&nat->nat_nsrc6, dst)) |
| 2242 | continue; |
| 2243 | |
| 2244 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 2245 | if (nat->nat_ndport != sport) |
| 2246 | continue; |
| 2247 | if (nat->nat_nsport != dport) |
| 2248 | continue; |
| 2249 | |
| 2250 | } else if (p == IPPROTO_ICMPV6) { |
| 2251 | if (nat->nat_osport != dport) { |
| 2252 | continue; |
| 2253 | } |
| 2254 | } |
| 2255 | break; |
| 2256 | case NAT_OUTBOUND : |
| 2257 | if (nat->nat_v[0] != 6) |
| 2258 | continue; |
| 2259 | if (IP6_NEQ(&nat->nat_osrc6, src) || |
| 2260 | IP6_NEQ(&nat->nat_odst6, dst)) |
| 2261 | continue; |
| 2262 | |
| 2263 | if ((nat->nat_flags & IPN_TCPUDP) != 0) { |
| 2264 | if (nat->nat_odport != dport) |
| 2265 | continue; |
| 2266 | if (nat->nat_osport != sport) |
| 2267 | continue; |
| 2268 | |
| 2269 | } else if (p == IPPROTO_ICMPV6) { |
| 2270 | if (nat->nat_osport != dport) { |
| 2271 | continue; |
| 2272 | } |
| 2273 | } |
| 2274 | break; |
| 2275 | } |
| 2276 | |
| 2277 | #ifdef IPF_V6_PROXIES |
| 2278 | if ((nat->nat_ptr != NULL) && (nat->nat_aps != NULL)) |
| 2279 | if (appr_match(fin, nat) != 0) |
| 2280 | continue; |
| 2281 | #endif |
| 2282 | |
| 2283 | if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { |
| 2284 | nat->nat_ifps[1] = ifp; |
| 2285 | nat->nat_mtu[1] = GETIFMTU_6(ifp); |
| 2286 | } |
| 2287 | return nat; |
| 2288 | } |
| 2289 | |
| 2290 | /* |
| 2291 | * So if we didn't find it but there are wildcard members in the hash |
| 2292 | * table, go back and look for them. We do this search and update here |
| 2293 | * because it is modifying the NAT table and we want to do this only |
| 2294 | * for the first packet that matches. The exception, of course, is |
| 2295 | * for "dummy" (FI_IGNORE) lookups. |
| 2296 | */ |
| 2297 | find_out_wild_ports: |
| 2298 | if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { |
| 2299 | NBUMPSIDE6DX(1, ns_lookup_miss, ns_lookup_miss_3); |
| 2300 | return NULL; |
| 2301 | } |
| 2302 | if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { |
| 2303 | NBUMPSIDE6D(1, ns_lookup_nowild); |
| 2304 | return NULL; |
| 2305 | } |
| 2306 | |
| 2307 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2308 | |
| 2309 | hv = NAT_HASH_FN6(src, 0, 0xffffffff); |
| 2310 | hv = NAT_HASH_FN6(dst, hv, softn->ipf_nat_table_sz); |
| 2311 | |
| 2312 | WRITE_ENTER(&softc->ipf_nat); |
| 2313 | |
| 2314 | nat = softn->ipf_nat_table[0][hv]; |
| 2315 | for (; nat; nat = nat->nat_hnext[0]) { |
| 2316 | if (nat->nat_ifps[1] != NULL) { |
| 2317 | if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) |
| 2318 | continue; |
| 2319 | } |
| 2320 | |
| 2321 | if (nat->nat_pr[1] != fin->fin_p) |
| 2322 | continue; |
| 2323 | |
| 2324 | switch (nat->nat_dir) |
| 2325 | { |
| 2326 | case NAT_INBOUND : |
| 2327 | if (nat->nat_v[1] != 6) |
| 2328 | continue; |
| 2329 | if (IP6_NEQ(&nat->nat_ndst6, src) || |
| 2330 | IP6_NEQ(&nat->nat_nsrc6, dst)) |
| 2331 | continue; |
| 2332 | break; |
| 2333 | case NAT_OUTBOUND : |
| 2334 | if (nat->nat_v[0] != 6) |
| 2335 | continue; |
| 2336 | if (IP6_NEQ(&nat->nat_osrc6, src) || |
| 2337 | IP6_NEQ(&nat->nat_odst6, dst)) |
| 2338 | continue; |
| 2339 | break; |
| 2340 | } |
| 2341 | |
| 2342 | if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP))) |
| 2343 | continue; |
| 2344 | |
| 2345 | if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags, |
| 2346 | NAT_OUTBOUND) == 1) { |
| 2347 | if ((fin->fin_flx & FI_IGNORE) != 0) |
| 2348 | break; |
| 2349 | if ((nat->nat_flags & SI_CLONE) != 0) { |
| 2350 | nat = ipf_nat_clone(fin, nat); |
| 2351 | if (nat == NULL) |
| 2352 | break; |
| 2353 | } else { |
| 2354 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 2355 | softn->ipf_nat_stats.ns_wilds--; |
| 2356 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 2357 | } |
| 2358 | |
| 2359 | if (nat->nat_dir == NAT_OUTBOUND) { |
| 2360 | if (nat->nat_osport == 0) { |
| 2361 | nat->nat_osport = sport; |
| 2362 | nat->nat_nsport = sport; |
| 2363 | } |
| 2364 | if (nat->nat_odport == 0) { |
| 2365 | nat->nat_odport = dport; |
| 2366 | nat->nat_ndport = dport; |
| 2367 | } |
| 2368 | } else { |
| 2369 | if (nat->nat_osport == 0) { |
| 2370 | nat->nat_osport = dport; |
| 2371 | nat->nat_nsport = dport; |
| 2372 | } |
| 2373 | if (nat->nat_odport == 0) { |
| 2374 | nat->nat_odport = sport; |
| 2375 | nat->nat_ndport = sport; |
| 2376 | } |
| 2377 | } |
| 2378 | if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { |
| 2379 | nat->nat_ifps[1] = ifp; |
| 2380 | nat->nat_mtu[1] = GETIFMTU_6(ifp); |
| 2381 | } |
| 2382 | nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); |
| 2383 | ipf_nat6_tabmove(softn, nat); |
| 2384 | break; |
| 2385 | } |
| 2386 | } |
| 2387 | |
| 2388 | MUTEX_DOWNGRADE(&softc->ipf_nat); |
| 2389 | |
| 2390 | if (nat == NULL) { |
| 2391 | NBUMPSIDE6DX(1, ns_lookup_miss, ns_lookup_miss_4); |
| 2392 | } |
| 2393 | return nat; |
| 2394 | } |
| 2395 | |
| 2396 | |
| 2397 | /* ------------------------------------------------------------------------ */ |
| 2398 | /* Function: ipf_nat6_lookupredir */ |
| 2399 | /* Returns: nat6_t* - NULL == no match, */ |
| 2400 | /* else pointer to matching NAT entry */ |
| 2401 | /* Parameters: softc(I) - pointer to soft context main structure */ |
| 2402 | /* np(I) - pointer to description of packet to find NAT */ |
| 2403 | /* table entry for. */ |
| 2404 | /* */ |
| 2405 | /* Lookup the NAT tables to search for a matching redirect */ |
| 2406 | /* The contents of natlookup_t should imitate those found in a packet that */ |
| 2407 | /* would be translated - ie a packet coming in for RDR or going out for MAP.*/ |
| 2408 | /* We can do the lookup in one of two ways, imitating an inbound or */ |
| 2409 | /* outbound packet. By default we assume outbound, unless IPN_IN is set. */ |
| 2410 | /* For IN, the fields are set as follows: */ |
| 2411 | /* nl_real* = source information */ |
| 2412 | /* nl_out* = destination information (translated) */ |
| 2413 | /* For an out packet, the fields are set like this: */ |
| 2414 | /* nl_in* = source information (untranslated) */ |
| 2415 | /* nl_out* = destination information (translated) */ |
| 2416 | /* ------------------------------------------------------------------------ */ |
| 2417 | nat_t * |
| 2418 | ipf_nat6_lookupredir(ipf_main_softc_t *softc, natlookup_t *np) |
| 2419 | { |
| 2420 | fr_info_t fi; |
| 2421 | nat_t *nat; |
| 2422 | |
| 2423 | bzero((char *)&fi, sizeof(fi)); |
| 2424 | fi.fin_main_soft = softc; |
| 2425 | if (np->nl_flags & IPN_IN) { |
| 2426 | fi.fin_data[0] = ntohs(np->nl_realport); |
| 2427 | fi.fin_data[1] = ntohs(np->nl_outport); |
| 2428 | } else { |
| 2429 | fi.fin_data[0] = ntohs(np->nl_inport); |
| 2430 | fi.fin_data[1] = ntohs(np->nl_outport); |
| 2431 | } |
| 2432 | if (np->nl_flags & IPN_TCP) |
| 2433 | fi.fin_p = IPPROTO_TCP; |
| 2434 | else if (np->nl_flags & IPN_UDP) |
| 2435 | fi.fin_p = IPPROTO_UDP; |
| 2436 | else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY)) |
| 2437 | fi.fin_p = IPPROTO_ICMPV6; |
| 2438 | |
| 2439 | /* |
| 2440 | * We can do two sorts of lookups: |
| 2441 | * - IPN_IN: we have the `real' and `out' address, look for `in'. |
| 2442 | * - default: we have the `in' and `out' address, look for `real'. |
| 2443 | */ |
| 2444 | if (np->nl_flags & IPN_IN) { |
| 2445 | if ((nat = ipf_nat6_inlookup(&fi, np->nl_flags, fi.fin_p, |
| 2446 | &np->nl_realip6, |
| 2447 | &np->nl_outip6))) { |
| 2448 | np->nl_inip6 = nat->nat_odst6.in6; |
| 2449 | np->nl_inport = nat->nat_odport; |
| 2450 | } |
| 2451 | } else { |
| 2452 | /* |
| 2453 | * If nl_inip is non null, this is a lookup based on the real |
| 2454 | * ip address. Else, we use the fake. |
| 2455 | */ |
| 2456 | if ((nat = ipf_nat6_outlookup(&fi, np->nl_flags, fi.fin_p, |
| 2457 | &np->nl_inip6, &np->nl_outip6))) { |
| 2458 | |
| 2459 | if ((np->nl_flags & IPN_FINDFORWARD) != 0) { |
| 2460 | fr_info_t fin; |
| 2461 | bzero((char *)&fin, sizeof(fin)); |
| 2462 | fin.fin_p = nat->nat_pr[0]; |
| 2463 | fin.fin_data[0] = ntohs(nat->nat_ndport); |
| 2464 | fin.fin_data[1] = ntohs(nat->nat_nsport); |
| 2465 | if (ipf_nat6_inlookup(&fin, np->nl_flags, |
| 2466 | fin.fin_p, |
| 2467 | &nat->nat_ndst6.in6, |
| 2468 | &nat->nat_nsrc6.in6) != |
| 2469 | NULL) { |
| 2470 | np->nl_flags &= ~IPN_FINDFORWARD; |
| 2471 | } |
| 2472 | } |
| 2473 | |
| 2474 | np->nl_realip6 = nat->nat_odst6.in6; |
| 2475 | np->nl_realport = nat->nat_odport; |
| 2476 | } |
| 2477 | } |
| 2478 | |
| 2479 | return nat; |
| 2480 | } |
| 2481 | |
| 2482 | |
| 2483 | /* ------------------------------------------------------------------------ */ |
| 2484 | /* Function: ipf_nat6_match */ |
| 2485 | /* Returns: int - 0 == no match, 1 == match */ |
| 2486 | /* Parameters: fin(I) - pointer to packet information */ |
| 2487 | /* np(I) - pointer to NAT rule */ |
| 2488 | /* */ |
| 2489 | /* Pull the matching of a packet against a NAT rule out of that complex */ |
| 2490 | /* loop inside ipf_nat6_checkin() and lay it out properly in its own */ |
| 2491 | /* function. */ |
| 2492 | /* ------------------------------------------------------------------------ */ |
| 2493 | static int |
| 2494 | ipf_nat6_match(fr_info_t *fin, ipnat_t *np) |
| 2495 | { |
| 2496 | frtuc_t *ft; |
| 2497 | int match; |
| 2498 | |
| 2499 | match = 0; |
| 2500 | switch (np->in_osrcatype) |
| 2501 | { |
| 2502 | case FRI_NORMAL : |
| 2503 | match = IP6_MASKNEQ(&fin->fin_src6, &np->in_osrcmsk6, |
| 2504 | &np->in_osrcip6); |
| 2505 | break; |
| 2506 | case FRI_LOOKUP : |
| 2507 | match = (*np->in_osrcfunc)(fin->fin_main_soft, np->in_osrcptr, |
| 2508 | 6, &fin->fin_src6, fin->fin_plen); |
| 2509 | break; |
| 2510 | } |
| 2511 | match ^= ((np->in_flags & IPN_NOTSRC) != 0); |
| 2512 | if (match) |
| 2513 | return 0; |
| 2514 | |
| 2515 | match = 0; |
| 2516 | switch (np->in_odstatype) |
| 2517 | { |
| 2518 | case FRI_NORMAL : |
| 2519 | match = IP6_MASKNEQ(&fin->fin_dst6, &np->in_odstmsk6, |
| 2520 | &np->in_odstip6); |
| 2521 | break; |
| 2522 | case FRI_LOOKUP : |
| 2523 | match = (*np->in_odstfunc)(fin->fin_main_soft, np->in_odstptr, |
| 2524 | 6, &fin->fin_dst6, fin->fin_plen); |
| 2525 | break; |
| 2526 | } |
| 2527 | |
| 2528 | match ^= ((np->in_flags & IPN_NOTDST) != 0); |
| 2529 | if (match) |
| 2530 | return 0; |
| 2531 | |
| 2532 | ft = &np->in_tuc; |
| 2533 | if (!(fin->fin_flx & FI_TCPUDP) || |
| 2534 | (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { |
| 2535 | if (ft->ftu_scmp || ft->ftu_dcmp) |
| 2536 | return 0; |
| 2537 | return 1; |
| 2538 | } |
| 2539 | |
| 2540 | return ipf_tcpudpchk(&fin->fin_fi, ft); |
| 2541 | } |
| 2542 | |
| 2543 | |
| 2544 | /* ------------------------------------------------------------------------ */ |
| 2545 | /* Function: ipf_nat6_checkout */ |
| 2546 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 2547 | /* 0 == no packet translation occurred, */ |
| 2548 | /* 1 == packet was successfully translated. */ |
| 2549 | /* Parameters: fin(I) - pointer to packet information */ |
| 2550 | /* passp(I) - pointer to filtering result flags */ |
| 2551 | /* */ |
| 2552 | /* Check to see if an outcoming packet should be changed. ICMP packets are */ |
| 2553 | /* first checked to see if they match an existing entry (if an error), */ |
| 2554 | /* otherwise a search of the current NAT table is made. If neither results */ |
| 2555 | /* in a match then a search for a matching NAT rule is made. Create a new */ |
| 2556 | /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ |
| 2557 | /* packet header(s) as required. */ |
| 2558 | /* ------------------------------------------------------------------------ */ |
| 2559 | int |
| 2560 | ipf_nat6_checkout(fr_info_t *fin, u_32_t *passp) |
| 2561 | { |
| 2562 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2563 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2564 | struct icmp6_hdr *icmp6 = NULL; |
| 2565 | struct ifnet *ifp, *sifp; |
| 2566 | #ifdef IPF_V6_PROXIES |
| 2567 | tcphdr_t *tcp = NULL; |
| 2568 | #endif |
| 2569 | int rval, natfailed; |
| 2570 | ipnat_t *np = NULL; |
| 2571 | u_int nflags = 0; |
| 2572 | i6addr_t ipa, iph; |
| 2573 | int natadd = 1; |
| 2574 | frentry_t *fr; |
| 2575 | nat_t *nat; |
| 2576 | |
| 2577 | if (softn->ipf_nat_stats.ns_rules == 0 || softn->ipf_nat_lock != 0) |
| 2578 | return 0; |
| 2579 | |
| 2580 | icmp6 = NULL; |
| 2581 | natfailed = 0; |
| 2582 | fr = fin->fin_fr; |
| 2583 | sifp = fin->fin_ifp; |
| 2584 | if (fr != NULL) { |
| 2585 | ifp = fr->fr_tifs[fin->fin_rev].fd_ptr; |
| 2586 | if ((ifp != NULL) && (ifp != (void *)-1)) |
| 2587 | fin->fin_ifp = ifp; |
| 2588 | } |
| 2589 | ifp = fin->fin_ifp; |
| 2590 | |
| 2591 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 2592 | switch (fin->fin_p) |
| 2593 | { |
| 2594 | case IPPROTO_TCP : |
| 2595 | nflags = IPN_TCP; |
| 2596 | break; |
| 2597 | case IPPROTO_UDP : |
| 2598 | nflags = IPN_UDP; |
| 2599 | break; |
| 2600 | case IPPROTO_ICMPV6 : |
| 2601 | icmp6 = fin->fin_dp; |
| 2602 | |
| 2603 | /* |
| 2604 | * Apart from ECHO request and reply, all other |
| 2605 | * informational messages should not be translated |
| 2606 | * so as to keep IPv6 working. |
| 2607 | */ |
| 2608 | if (icmp6->icmp6_type > ICMP6_ECHO_REPLY) |
| 2609 | return 0; |
| 2610 | |
| 2611 | /* |
| 2612 | * This is an incoming packet, so the destination is |
| 2613 | * the icmp6_id and the source port equals 0 |
| 2614 | */ |
| 2615 | if ((fin->fin_flx & FI_ICMPQUERY) != 0) |
| 2616 | nflags = IPN_ICMPQUERY; |
| 2617 | break; |
| 2618 | default : |
| 2619 | break; |
| 2620 | } |
| 2621 | |
| 2622 | #ifdef IPF_V6_PROXIES |
| 2623 | if ((nflags & IPN_TCPUDP)) |
| 2624 | tcp = fin->fin_dp; |
| 2625 | #endif |
| 2626 | } |
| 2627 | |
| 2628 | ipa = fin->fin_src6; |
| 2629 | |
| 2630 | READ_ENTER(&softc->ipf_nat); |
| 2631 | |
| 2632 | if ((fin->fin_p == IPPROTO_ICMPV6) && !(nflags & IPN_ICMPQUERY) && |
| 2633 | (nat = ipf_nat6_icmperror(fin, &nflags, NAT_OUTBOUND))) |
| 2634 | /*EMPTY*/; |
| 2635 | else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) |
| 2636 | natadd = 0; |
| 2637 | else if ((nat = ipf_nat6_outlookup(fin, nflags|NAT_SEARCH, |
| 2638 | (u_int)fin->fin_p, |
| 2639 | &fin->fin_src6.in6, |
| 2640 | &fin->fin_dst6.in6))) { |
| 2641 | nflags = nat->nat_flags; |
| 2642 | } else if (fin->fin_off == 0) { |
| 2643 | u_32_t hv, nmsk = 0; |
| 2644 | i6addr_t *msk; |
| 2645 | |
| 2646 | /* |
| 2647 | * If there is no current entry in the nat table for this IP#, |
| 2648 | * create one for it (if there is a matching rule). |
| 2649 | */ |
| 2650 | maskloop: |
| 2651 | msk = &softn->ipf_nat6_map_active_masks[nmsk]; |
| 2652 | IP6_AND(&ipa, msk, &iph); |
| 2653 | hv = NAT_HASH_FN6(&iph, 0, softn->ipf_nat_maprules_sz); |
| 2654 | for (np = softn->ipf_nat_map_rules[hv]; np; np = np->in_mnext) { |
| 2655 | if ((np->in_ifps[1] && (np->in_ifps[1] != ifp))) |
| 2656 | continue; |
| 2657 | if (np->in_v[0] != 6) |
| 2658 | continue; |
| 2659 | if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p)) |
| 2660 | continue; |
| 2661 | if ((np->in_flags & IPN_RF) && |
| 2662 | !(np->in_flags & nflags)) |
| 2663 | continue; |
| 2664 | if (np->in_flags & IPN_FILTER) { |
| 2665 | switch (ipf_nat6_match(fin, np)) |
| 2666 | { |
| 2667 | case 0 : |
| 2668 | continue; |
| 2669 | case -1 : |
| 2670 | rval = -1; |
| 2671 | goto outmatchfail; |
| 2672 | case 1 : |
| 2673 | default : |
| 2674 | break; |
| 2675 | } |
| 2676 | } else if (!IP6_MASKEQ(&ipa, &np->in_osrcmsk, |
| 2677 | &np->in_osrcip6)) |
| 2678 | continue; |
| 2679 | |
| 2680 | if ((fr != NULL) && |
| 2681 | !ipf_matchtag(&np->in_tag, &fr->fr_nattag)) |
| 2682 | continue; |
| 2683 | |
| 2684 | #ifdef IPF_V6_PROXIES |
| 2685 | if (np->in_plabel != -1) { |
| 2686 | if (((np->in_flags & IPN_FILTER) == 0) && |
| 2687 | (np->in_odport != fin->fin_data[1])) |
| 2688 | continue; |
| 2689 | if (appr_ok(fin, tcp, np) == 0) |
| 2690 | continue; |
| 2691 | } |
| 2692 | #endif |
| 2693 | |
| 2694 | if (np->in_flags & IPN_NO) { |
| 2695 | np->in_hits++; |
| 2696 | break; |
| 2697 | } |
| 2698 | |
| 2699 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 2700 | nat = ipf_nat6_add(fin, np, NULL, nflags, NAT_OUTBOUND); |
| 2701 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 2702 | if (nat != NULL) { |
| 2703 | np->in_hits++; |
| 2704 | break; |
| 2705 | } |
| 2706 | natfailed = -1; |
| 2707 | } |
| 2708 | if ((np == NULL) && (nmsk < softn->ipf_nat6_map_max)) { |
| 2709 | nmsk++; |
| 2710 | goto maskloop; |
| 2711 | } |
| 2712 | } |
| 2713 | |
| 2714 | if (nat != NULL) { |
| 2715 | rval = ipf_nat6_out(fin, nat, natadd, nflags); |
| 2716 | if (rval == 1) { |
| 2717 | MUTEX_ENTER(&nat->nat_lock); |
| 2718 | ipf_nat_update(fin, nat); |
| 2719 | nat->nat_bytes[1] += fin->fin_plen; |
| 2720 | nat->nat_pkts[1]++; |
| 2721 | MUTEX_EXIT(&nat->nat_lock); |
| 2722 | } |
| 2723 | } else |
| 2724 | rval = natfailed; |
| 2725 | outmatchfail: |
| 2726 | RWLOCK_EXIT(&softc->ipf_nat); |
| 2727 | |
| 2728 | switch (rval) |
| 2729 | { |
| 2730 | case -1 : |
| 2731 | if (passp != NULL) { |
| 2732 | NBUMPSIDE6D(1, ns_drop); |
| 2733 | *passp = FR_BLOCK; |
| 2734 | fin->fin_reason = FRB_NATV6; |
| 2735 | } |
| 2736 | fin->fin_flx |= FI_BADNAT; |
| 2737 | NBUMPSIDE6D(1, ns_badnat); |
| 2738 | break; |
| 2739 | case 0 : |
| 2740 | NBUMPSIDE6D(1, ns_ignored); |
| 2741 | break; |
| 2742 | case 1 : |
| 2743 | NBUMPSIDE6D(1, ns_translated); |
| 2744 | break; |
| 2745 | } |
| 2746 | fin->fin_ifp = sifp; |
| 2747 | return rval; |
| 2748 | } |
| 2749 | |
| 2750 | /* ------------------------------------------------------------------------ */ |
| 2751 | /* Function: ipf_nat6_out */ |
| 2752 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 2753 | /* 1 == packet was successfully translated. */ |
| 2754 | /* Parameters: fin(I) - pointer to packet information */ |
| 2755 | /* nat(I) - pointer to NAT structure */ |
| 2756 | /* natadd(I) - flag indicating if it is safe to add frag cache */ |
| 2757 | /* nflags(I) - NAT flags set for this packet */ |
| 2758 | /* */ |
| 2759 | /* Translate a packet coming "out" on an interface. */ |
| 2760 | /* ------------------------------------------------------------------------ */ |
| 2761 | static int |
| 2762 | ipf_nat6_out(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) |
| 2763 | { |
| 2764 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2765 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2766 | struct icmp6_hdr *icmp6; |
| 2767 | tcphdr_t *tcp; |
| 2768 | ipnat_t *np; |
| 2769 | int skip; |
| 2770 | int i; |
| 2771 | |
| 2772 | tcp = NULL; |
| 2773 | icmp6 = NULL; |
| 2774 | np = nat->nat_ptr; |
| 2775 | |
| 2776 | if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL)) |
| 2777 | (void) ipf_frag_natnew(softc, fin, 0, nat); |
| 2778 | |
| 2779 | /* |
| 2780 | * Address assignment is after the checksum modification because |
| 2781 | * we are using the address in the packet for determining the |
| 2782 | * correct checksum offset (the ICMP error could be coming from |
| 2783 | * anyone...) |
| 2784 | */ |
| 2785 | switch (nat->nat_dir) |
| 2786 | { |
| 2787 | case NAT_OUTBOUND : |
| 2788 | fin->fin_ip6->ip6_src = nat->nat_nsrc6.in6; |
| 2789 | fin->fin_src6 = nat->nat_nsrc6; |
| 2790 | fin->fin_ip6->ip6_dst = nat->nat_ndst6.in6; |
| 2791 | fin->fin_dst6 = nat->nat_ndst6; |
| 2792 | break; |
| 2793 | |
| 2794 | case NAT_INBOUND : |
| 2795 | fin->fin_ip6->ip6_src = nat->nat_odst6.in6; |
| 2796 | fin->fin_src6 = nat->nat_ndst6; |
| 2797 | fin->fin_ip6->ip6_dst = nat->nat_osrc6.in6; |
| 2798 | fin->fin_dst6 = nat->nat_nsrc6; |
| 2799 | break; |
| 2800 | |
| 2801 | case NAT_DIVERTIN : |
| 2802 | { |
| 2803 | mb_t *m; |
| 2804 | |
| 2805 | skip = ipf_nat6_decap(fin, nat); |
| 2806 | if (skip <= 0) { |
| 2807 | NBUMPSIDE6D(1, ns_decap_fail); |
| 2808 | return -1; |
| 2809 | } |
| 2810 | |
| 2811 | m = fin->fin_m; |
| 2812 | |
| 2813 | #if defined(MENTAT) && defined(_KERNEL) |
| 2814 | m->b_rptr += skip; |
| 2815 | #else |
| 2816 | m->m_data += skip; |
| 2817 | m->m_len -= skip; |
| 2818 | |
| 2819 | # ifdef M_PKTHDR |
| 2820 | if (m->m_flags & M_PKTHDR) |
| 2821 | m->m_pkthdr.len -= skip; |
| 2822 | # endif |
| 2823 | #endif |
| 2824 | |
| 2825 | MUTEX_ENTER(&nat->nat_lock); |
| 2826 | ipf_nat_update(fin, nat); |
| 2827 | MUTEX_EXIT(&nat->nat_lock); |
| 2828 | fin->fin_flx |= FI_NATED; |
| 2829 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 2830 | fin->fin_nattag = &np->in_tag; |
| 2831 | return 1; |
| 2832 | /* NOTREACHED */ |
| 2833 | } |
| 2834 | |
| 2835 | case NAT_DIVERTOUT : |
| 2836 | { |
| 2837 | udphdr_t *uh; |
| 2838 | ip6_t *ip6; |
| 2839 | mb_t *m; |
| 2840 | |
| 2841 | m = M_DUP(np->in_divmp); |
| 2842 | if (m == NULL) { |
| 2843 | NBUMPSIDE6D(1, ns_divert_dup); |
| 2844 | return -1; |
| 2845 | } |
| 2846 | |
| 2847 | ip6 = MTOD(m, ip6_t *); |
| 2848 | |
| 2849 | ip6->ip6_plen = htons(fin->fin_plen + 8); |
| 2850 | |
| 2851 | uh = (udphdr_t *)(ip6 + 1); |
| 2852 | uh->uh_ulen = htons(fin->fin_plen); |
| 2853 | |
| 2854 | PREP_MB_T(fin, m); |
| 2855 | |
| 2856 | fin->fin_ip6 = ip6; |
| 2857 | fin->fin_plen += sizeof(ip6_t) + 8; /* UDP + new IPv4 hdr */ |
| 2858 | fin->fin_dlen += sizeof(ip6_t) + 8; /* UDP + old IPv4 hdr */ |
| 2859 | |
| 2860 | nflags &= ~IPN_TCPUDPICMP; |
| 2861 | |
| 2862 | break; |
| 2863 | } |
| 2864 | |
| 2865 | default : |
| 2866 | break; |
| 2867 | } |
| 2868 | |
| 2869 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 2870 | u_short *csump; |
| 2871 | |
| 2872 | if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) { |
| 2873 | tcp = fin->fin_dp; |
| 2874 | |
| 2875 | switch (nat->nat_dir) |
| 2876 | { |
| 2877 | case NAT_OUTBOUND : |
| 2878 | tcp->th_sport = nat->nat_nsport; |
| 2879 | fin->fin_data[0] = ntohs(nat->nat_nsport); |
| 2880 | tcp->th_dport = nat->nat_ndport; |
| 2881 | fin->fin_data[1] = ntohs(nat->nat_ndport); |
| 2882 | break; |
| 2883 | |
| 2884 | case NAT_INBOUND : |
| 2885 | tcp->th_sport = nat->nat_odport; |
| 2886 | fin->fin_data[0] = ntohs(nat->nat_odport); |
| 2887 | tcp->th_dport = nat->nat_osport; |
| 2888 | fin->fin_data[1] = ntohs(nat->nat_osport); |
| 2889 | break; |
| 2890 | } |
| 2891 | } |
| 2892 | |
| 2893 | if ((nat->nat_nsport != 0) && (nflags & IPN_ICMPQUERY)) { |
| 2894 | icmp6 = fin->fin_dp; |
| 2895 | icmp6->icmp6_id = nat->nat_nicmpid; |
| 2896 | } |
| 2897 | |
| 2898 | csump = ipf_nat_proto(fin, nat, nflags); |
| 2899 | |
| 2900 | /* |
| 2901 | * The above comments do not hold for layer 4 (or higher) |
| 2902 | * checksums... |
| 2903 | */ |
| 2904 | if (csump != NULL) { |
| 2905 | if (nat->nat_dir == NAT_OUTBOUND) |
| 2906 | ipf_fix_outcksum(fin->fin_cksum, csump, |
| 2907 | nat->nat_sumd[0], |
| 2908 | nat->nat_sumd[1] + |
| 2909 | fin->fin_dlen); |
| 2910 | else |
| 2911 | ipf_fix_incksum(fin->fin_cksum, csump, |
| 2912 | nat->nat_sumd[0], |
| 2913 | nat->nat_sumd[1] + |
| 2914 | fin->fin_dlen); |
| 2915 | } |
| 2916 | } |
| 2917 | |
| 2918 | ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); |
| 2919 | /* ------------------------------------------------------------- */ |
| 2920 | /* A few quick notes: */ |
| 2921 | /* Following are test conditions prior to calling the */ |
| 2922 | /* ipf_proxy_check routine. */ |
| 2923 | /* */ |
| 2924 | /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ |
| 2925 | /* with a redirect rule, we attempt to match the packet's */ |
| 2926 | /* source port against in_dport, otherwise we'd compare the */ |
| 2927 | /* packet's destination. */ |
| 2928 | /* ------------------------------------------------------------- */ |
| 2929 | if ((np != NULL) && (np->in_apr != NULL)) { |
| 2930 | i = ipf_proxy_check(fin, nat); |
| 2931 | if (i == 0) { |
| 2932 | i = 1; |
| 2933 | } else if (i == -1) { |
| 2934 | NBUMPSIDE6D(1, ns_ipf_proxy_fail); |
| 2935 | } |
| 2936 | } else { |
| 2937 | i = 1; |
| 2938 | } |
| 2939 | fin->fin_flx |= FI_NATED; |
| 2940 | return i; |
| 2941 | } |
| 2942 | |
| 2943 | |
| 2944 | /* ------------------------------------------------------------------------ */ |
| 2945 | /* Function: ipf_nat6_checkin */ |
| 2946 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 2947 | /* 0 == no packet translation occurred, */ |
| 2948 | /* 1 == packet was successfully translated. */ |
| 2949 | /* Parameters: fin(I) - pointer to packet information */ |
| 2950 | /* passp(I) - pointer to filtering result flags */ |
| 2951 | /* */ |
| 2952 | /* Check to see if an incoming packet should be changed. ICMP packets are */ |
| 2953 | /* first checked to see if they match an existing entry (if an error), */ |
| 2954 | /* otherwise a search of the current NAT table is made. If neither results */ |
| 2955 | /* in a match then a search for a matching NAT rule is made. Create a new */ |
| 2956 | /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ |
| 2957 | /* packet header(s) as required. */ |
| 2958 | /* ------------------------------------------------------------------------ */ |
| 2959 | int |
| 2960 | ipf_nat6_checkin(fr_info_t *fin, u_32_t *passp) |
| 2961 | { |
| 2962 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 2963 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 2964 | struct icmp6_hdr *icmp6; |
| 2965 | u_int nflags, natadd; |
| 2966 | int rval, natfailed; |
| 2967 | struct ifnet *ifp; |
| 2968 | i6addr_t ipa, iph; |
| 2969 | #ifdef IPF_V6_PROXIES |
| 2970 | tcphdr_t *tcp; |
| 2971 | #endif |
| 2972 | u_short dport; |
| 2973 | ipnat_t *np; |
| 2974 | nat_t *nat; |
| 2975 | |
| 2976 | if (softn->ipf_nat_stats.ns_rules == 0 || softn->ipf_nat_lock != 0) |
| 2977 | return 0; |
| 2978 | |
| 2979 | #ifdef IPF_V6_PROXIES |
| 2980 | tcp = NULL; |
| 2981 | #endif |
| 2982 | icmp6 = NULL; |
| 2983 | dport = 0; |
| 2984 | natadd = 1; |
| 2985 | nflags = 0; |
| 2986 | natfailed = 0; |
| 2987 | ifp = fin->fin_ifp; |
| 2988 | |
| 2989 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 2990 | switch (fin->fin_p) |
| 2991 | { |
| 2992 | case IPPROTO_TCP : |
| 2993 | nflags = IPN_TCP; |
| 2994 | break; |
| 2995 | case IPPROTO_UDP : |
| 2996 | nflags = IPN_UDP; |
| 2997 | break; |
| 2998 | case IPPROTO_ICMPV6 : |
| 2999 | icmp6 = fin->fin_dp; |
| 3000 | |
| 3001 | /* |
| 3002 | * Apart from ECHO request and reply, all other |
| 3003 | * informational messages should not be translated |
| 3004 | * so as to keep IPv6 working. |
| 3005 | */ |
| 3006 | if (icmp6->icmp6_type > ICMP6_ECHO_REPLY) |
| 3007 | return 0; |
| 3008 | |
| 3009 | /* |
| 3010 | * This is an incoming packet, so the destination is |
| 3011 | * the icmp6_id and the source port equals 0 |
| 3012 | */ |
| 3013 | if ((fin->fin_flx & FI_ICMPQUERY) != 0) { |
| 3014 | nflags = IPN_ICMPQUERY; |
| 3015 | dport = icmp6->icmp6_id; |
| 3016 | } break; |
| 3017 | default : |
| 3018 | break; |
| 3019 | } |
| 3020 | |
| 3021 | if ((nflags & IPN_TCPUDP)) { |
| 3022 | #ifdef IPF_V6_PROXIES |
| 3023 | tcp = fin->fin_dp; |
| 3024 | #endif |
| 3025 | dport = fin->fin_data[1]; |
| 3026 | } |
| 3027 | } |
| 3028 | |
| 3029 | ipa = fin->fin_dst6; |
| 3030 | |
| 3031 | READ_ENTER(&softc->ipf_nat); |
| 3032 | |
| 3033 | if ((fin->fin_p == IPPROTO_ICMPV6) && !(nflags & IPN_ICMPQUERY) && |
| 3034 | (nat = ipf_nat6_icmperror(fin, &nflags, NAT_INBOUND))) |
| 3035 | /*EMPTY*/; |
| 3036 | else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) |
| 3037 | natadd = 0; |
| 3038 | else if ((nat = ipf_nat6_inlookup(fin, nflags|NAT_SEARCH, |
| 3039 | (u_int)fin->fin_p, |
| 3040 | &fin->fin_src6.in6, &ipa.in6))) { |
| 3041 | nflags = nat->nat_flags; |
| 3042 | } else if (fin->fin_off == 0) { |
| 3043 | u_32_t hv, rmsk = 0; |
| 3044 | i6addr_t *msk; |
| 3045 | |
| 3046 | /* |
| 3047 | * If there is no current entry in the nat table for this IP#, |
| 3048 | * create one for it (if there is a matching rule). |
| 3049 | */ |
| 3050 | maskloop: |
| 3051 | msk = &softn->ipf_nat6_rdr_active_masks[rmsk]; |
| 3052 | IP6_AND(&ipa, msk, &iph); |
| 3053 | hv = NAT_HASH_FN6(&iph, 0, softn->ipf_nat_rdrrules_sz); |
| 3054 | for (np = softn->ipf_nat_rdr_rules[hv]; np; np = np->in_rnext) { |
| 3055 | if (np->in_ifps[0] && (np->in_ifps[0] != ifp)) |
| 3056 | continue; |
| 3057 | if (np->in_v[0] != 6) |
| 3058 | continue; |
| 3059 | if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p)) |
| 3060 | continue; |
| 3061 | if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags)) |
| 3062 | continue; |
| 3063 | if (np->in_flags & IPN_FILTER) { |
| 3064 | switch (ipf_nat6_match(fin, np)) |
| 3065 | { |
| 3066 | case 0 : |
| 3067 | continue; |
| 3068 | case -1 : |
| 3069 | rval = -1; |
| 3070 | goto inmatchfail; |
| 3071 | case 1 : |
| 3072 | default : |
| 3073 | break; |
| 3074 | } |
| 3075 | } else { |
| 3076 | if (!IP6_MASKEQ(&ipa, &np->in_odstmsk6, |
| 3077 | &np->in_odstip6)) { |
| 3078 | continue; |
| 3079 | } |
| 3080 | if (np->in_odport && |
| 3081 | ((np->in_dtop < dport) || |
| 3082 | (dport < np->in_odport))) |
| 3083 | continue; |
| 3084 | } |
| 3085 | |
| 3086 | #ifdef IPF_V6_PROXIES |
| 3087 | if (np->in_plabel != -1) { |
| 3088 | if (!appr_ok(fin, tcp, np)) { |
| 3089 | continue; |
| 3090 | } |
| 3091 | } |
| 3092 | #endif |
| 3093 | |
| 3094 | if (np->in_flags & IPN_NO) { |
| 3095 | np->in_hits++; |
| 3096 | break; |
| 3097 | } |
| 3098 | |
| 3099 | MUTEX_ENTER(&softn->ipf_nat_new); |
| 3100 | nat = ipf_nat6_add(fin, np, NULL, nflags, NAT_INBOUND); |
| 3101 | MUTEX_EXIT(&softn->ipf_nat_new); |
| 3102 | if (nat != NULL) { |
| 3103 | np->in_hits++; |
| 3104 | break; |
| 3105 | } |
| 3106 | natfailed = -1; |
| 3107 | } |
| 3108 | |
| 3109 | if ((np == NULL) && (rmsk < softn->ipf_nat6_rdr_max)) { |
| 3110 | rmsk++; |
| 3111 | goto maskloop; |
| 3112 | } |
| 3113 | } |
| 3114 | if (nat != NULL) { |
| 3115 | rval = ipf_nat6_in(fin, nat, natadd, nflags); |
| 3116 | if (rval == 1) { |
| 3117 | MUTEX_ENTER(&nat->nat_lock); |
| 3118 | ipf_nat_update(fin, nat); |
| 3119 | nat->nat_bytes[0] += fin->fin_plen; |
| 3120 | nat->nat_pkts[0]++; |
| 3121 | MUTEX_EXIT(&nat->nat_lock); |
| 3122 | } |
| 3123 | } else |
| 3124 | rval = natfailed; |
| 3125 | inmatchfail: |
| 3126 | RWLOCK_EXIT(&softc->ipf_nat); |
| 3127 | |
| 3128 | switch (rval) |
| 3129 | { |
| 3130 | case -1 : |
| 3131 | if (passp != NULL) { |
| 3132 | NBUMPSIDE6D(0, ns_drop); |
| 3133 | *passp = FR_BLOCK; |
| 3134 | fin->fin_reason = FRB_NATV6; |
| 3135 | } |
| 3136 | fin->fin_flx |= FI_BADNAT; |
| 3137 | NBUMPSIDE6D(0, ns_badnat); |
| 3138 | break; |
| 3139 | case 0 : |
| 3140 | NBUMPSIDE6D(0, ns_ignored); |
| 3141 | break; |
| 3142 | case 1 : |
| 3143 | NBUMPSIDE6D(0, ns_translated); |
| 3144 | break; |
| 3145 | } |
| 3146 | return rval; |
| 3147 | } |
| 3148 | |
| 3149 | |
| 3150 | /* ------------------------------------------------------------------------ */ |
| 3151 | /* Function: ipf_nat6_in */ |
| 3152 | /* Returns: int - -1 == packet failed NAT checks so block it, */ |
| 3153 | /* 1 == packet was successfully translated. */ |
| 3154 | /* Parameters: fin(I) - pointer to packet information */ |
| 3155 | /* nat(I) - pointer to NAT structure */ |
| 3156 | /* natadd(I) - flag indicating if it is safe to add frag cache */ |
| 3157 | /* nflags(I) - NAT flags set for this packet */ |
| 3158 | /* Locks Held: (READ) */ |
| 3159 | /* */ |
| 3160 | /* Translate a packet coming "in" on an interface. */ |
| 3161 | /* ------------------------------------------------------------------------ */ |
| 3162 | static int |
| 3163 | ipf_nat6_in(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) |
| 3164 | { |
| 3165 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3166 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3167 | struct icmp6_hdr *icmp6; |
| 3168 | u_short *csump; |
| 3169 | tcphdr_t *tcp; |
| 3170 | ipnat_t *np; |
| 3171 | int skip; |
| 3172 | int i; |
| 3173 | |
| 3174 | tcp = NULL; |
| 3175 | csump = NULL; |
| 3176 | np = nat->nat_ptr; |
| 3177 | fin->fin_fr = nat->nat_fr; |
| 3178 | |
| 3179 | if (np != NULL) { |
| 3180 | if ((natadd != 0) && (fin->fin_flx & FI_FRAG)) |
| 3181 | (void) ipf_frag_natnew(softc, fin, 0, nat); |
| 3182 | |
| 3183 | /* ------------------------------------------------------------- */ |
| 3184 | /* A few quick notes: */ |
| 3185 | /* Following are test conditions prior to calling the */ |
| 3186 | /* ipf_proxy_check routine. */ |
| 3187 | /* */ |
| 3188 | /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ |
| 3189 | /* with a map rule, we attempt to match the packet's */ |
| 3190 | /* source port against in_dport, otherwise we'd compare the */ |
| 3191 | /* packet's destination. */ |
| 3192 | /* ------------------------------------------------------------- */ |
| 3193 | if (np->in_apr != NULL) { |
| 3194 | i = ipf_proxy_check(fin, nat); |
| 3195 | if (i == -1) { |
| 3196 | NBUMPSIDE6D(0, ns_ipf_proxy_fail); |
| 3197 | return -1; |
| 3198 | } |
| 3199 | } |
| 3200 | } |
| 3201 | |
| 3202 | ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); |
| 3203 | |
| 3204 | /* |
| 3205 | * Fix up checksums, not by recalculating them, but |
| 3206 | * simply computing adjustments. |
| 3207 | * Why only do this for some platforms on inbound packets ? |
| 3208 | * Because for those that it is done, IP processing is yet to happen |
| 3209 | * and so the IPv4 header checksum has not yet been evaluated. |
| 3210 | * Perhaps it should always be done for the benefit of things like |
| 3211 | * fast forwarding (so that it doesn't need to be recomputed) but with |
| 3212 | * header checksum offloading, perhaps it is a moot point. |
| 3213 | */ |
| 3214 | |
| 3215 | switch (nat->nat_dir) |
| 3216 | { |
| 3217 | case NAT_INBOUND : |
| 3218 | if ((fin->fin_flx & FI_ICMPERR) == 0) { |
| 3219 | fin->fin_ip6->ip6_src = nat->nat_nsrc6.in6; |
| 3220 | fin->fin_src6 = nat->nat_nsrc6; |
| 3221 | } |
| 3222 | fin->fin_ip6->ip6_dst = nat->nat_ndst6.in6; |
| 3223 | fin->fin_dst6 = nat->nat_ndst6; |
| 3224 | break; |
| 3225 | |
| 3226 | case NAT_OUTBOUND : |
| 3227 | if ((fin->fin_flx & FI_ICMPERR) == 0) { |
| 3228 | fin->fin_ip6->ip6_src = nat->nat_odst6.in6; |
| 3229 | fin->fin_src6 = nat->nat_odst6; |
| 3230 | } |
| 3231 | fin->fin_ip6->ip6_dst = nat->nat_osrc6.in6; |
| 3232 | fin->fin_dst6 = nat->nat_osrc6; |
| 3233 | break; |
| 3234 | |
| 3235 | case NAT_DIVERTIN : |
| 3236 | { |
| 3237 | udphdr_t *uh; |
| 3238 | ip6_t *ip6; |
| 3239 | mb_t *m; |
| 3240 | |
| 3241 | m = M_DUP(np->in_divmp); |
| 3242 | if (m == NULL) { |
| 3243 | NBUMPSIDE6D(0, ns_divert_dup); |
| 3244 | return -1; |
| 3245 | } |
| 3246 | |
| 3247 | ip6 = MTOD(m, ip6_t *); |
| 3248 | ip6->ip6_plen = htons(fin->fin_plen + sizeof(udphdr_t)); |
| 3249 | |
| 3250 | uh = (udphdr_t *)(ip6 + 1); |
| 3251 | uh->uh_ulen = ntohs(fin->fin_plen); |
| 3252 | |
| 3253 | PREP_MB_T(fin, m); |
| 3254 | |
| 3255 | fin->fin_ip6 = ip6; |
| 3256 | fin->fin_plen += sizeof(ip6_t) + 8; /* UDP + new IPv6 hdr */ |
| 3257 | fin->fin_dlen += sizeof(ip6_t) + 8; /* UDP + old IPv6 hdr */ |
| 3258 | |
| 3259 | nflags &= ~IPN_TCPUDPICMP; |
| 3260 | |
| 3261 | break; |
| 3262 | } |
| 3263 | |
| 3264 | case NAT_DIVERTOUT : |
| 3265 | { |
| 3266 | mb_t *m; |
| 3267 | |
| 3268 | skip = ipf_nat6_decap(fin, nat); |
| 3269 | if (skip <= 0) { |
| 3270 | NBUMPSIDE6D(0, ns_decap_fail); |
| 3271 | return -1; |
| 3272 | } |
| 3273 | |
| 3274 | m = fin->fin_m; |
| 3275 | |
| 3276 | #if defined(MENTAT) && defined(_KERNEL) |
| 3277 | m->b_rptr += skip; |
| 3278 | #else |
| 3279 | m->m_data += skip; |
| 3280 | m->m_len -= skip; |
| 3281 | |
| 3282 | # ifdef M_PKTHDR |
| 3283 | if (m->m_flags & M_PKTHDR) |
| 3284 | m->m_pkthdr.len -= skip; |
| 3285 | # endif |
| 3286 | #endif |
| 3287 | |
| 3288 | ipf_nat_update(fin, nat); |
| 3289 | fin->fin_flx |= FI_NATED; |
| 3290 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 3291 | fin->fin_nattag = &np->in_tag; |
| 3292 | return 1; |
| 3293 | /* NOTREACHED */ |
| 3294 | } |
| 3295 | } |
| 3296 | if (nflags & IPN_TCPUDP) |
| 3297 | tcp = fin->fin_dp; |
| 3298 | |
| 3299 | if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { |
| 3300 | if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) { |
| 3301 | switch (nat->nat_dir) |
| 3302 | { |
| 3303 | case NAT_INBOUND : |
| 3304 | tcp->th_sport = nat->nat_nsport; |
| 3305 | fin->fin_data[0] = ntohs(nat->nat_nsport); |
| 3306 | tcp->th_dport = nat->nat_ndport; |
| 3307 | fin->fin_data[1] = ntohs(nat->nat_ndport); |
| 3308 | break; |
| 3309 | |
| 3310 | case NAT_OUTBOUND : |
| 3311 | tcp->th_sport = nat->nat_odport; |
| 3312 | fin->fin_data[0] = ntohs(nat->nat_odport); |
| 3313 | tcp->th_dport = nat->nat_osport; |
| 3314 | fin->fin_data[1] = ntohs(nat->nat_osport); |
| 3315 | break; |
| 3316 | } |
| 3317 | } |
| 3318 | |
| 3319 | |
| 3320 | if ((nat->nat_odport != 0) && (nflags & IPN_ICMPQUERY)) { |
| 3321 | icmp6 = fin->fin_dp; |
| 3322 | |
| 3323 | icmp6->icmp6_id = nat->nat_nicmpid; |
| 3324 | } |
| 3325 | |
| 3326 | csump = ipf_nat_proto(fin, nat, nflags); |
| 3327 | } |
| 3328 | |
| 3329 | /* |
| 3330 | * The above comments do not hold for layer 4 (or higher) checksums... |
| 3331 | */ |
| 3332 | if (csump != NULL) { |
| 3333 | if (nat->nat_dir == NAT_OUTBOUND) |
| 3334 | ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0); |
| 3335 | else |
| 3336 | ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0); |
| 3337 | } |
| 3338 | fin->fin_flx |= FI_NATED; |
| 3339 | if (np != NULL && np->in_tag.ipt_num[0] != 0) |
| 3340 | fin->fin_nattag = &np->in_tag; |
| 3341 | return 1; |
| 3342 | } |
| 3343 | |
| 3344 | |
| 3345 | /* ------------------------------------------------------------------------ */ |
| 3346 | /* Function: ipf_nat6_newrewrite */ |
| 3347 | /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ |
| 3348 | /* allow rule to be moved if IPN_ROUNDR is set. */ |
| 3349 | /* Parameters: fin(I) - pointer to packet information */ |
| 3350 | /* nat(I) - pointer to NAT entry */ |
| 3351 | /* ni(I) - pointer to structure with misc. information needed */ |
| 3352 | /* to create new NAT entry. */ |
| 3353 | /* Write Lock: ipf_nat */ |
| 3354 | /* */ |
| 3355 | /* This function is responsible for setting up an active NAT session where */ |
| 3356 | /* we are changing both the source and destination parameters at the same */ |
| 3357 | /* time. The loop in here works differently to elsewhere - each iteration */ |
| 3358 | /* is responsible for changing a single parameter that can be incremented. */ |
| 3359 | /* So one pass may increase the source IP#, next source port, next dest. IP#*/ |
| 3360 | /* and the last destination port for a total of 4 iterations to try each. */ |
| 3361 | /* This is done to try and exhaustively use the translation space available.*/ |
| 3362 | /* ------------------------------------------------------------------------ */ |
| 3363 | int |
| 3364 | ipf_nat6_newrewrite(fr_info_t *fin, nat_t *nat, natinfo_t *nai) |
| 3365 | { |
| 3366 | int src_search = 1; |
| 3367 | int dst_search = 1; |
| 3368 | fr_info_t frnat; |
| 3369 | u_32_t flags; |
| 3370 | u_short swap; |
| 3371 | ipnat_t *np; |
| 3372 | nat_t *natl; |
| 3373 | int l = 0; |
| 3374 | int changed; |
| 3375 | |
| 3376 | natl = NULL; |
| 3377 | changed = -1; |
| 3378 | np = nai->nai_np; |
| 3379 | flags = nat->nat_flags; |
| 3380 | bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); |
| 3381 | |
| 3382 | nat->nat_hm = NULL; |
| 3383 | |
| 3384 | do { |
| 3385 | changed = -1; |
| 3386 | /* TRACE (l, src_search, dst_search, np) */ |
| 3387 | |
| 3388 | if ((src_search == 0) && (np->in_spnext == 0) && |
| 3389 | (dst_search == 0) && (np->in_dpnext == 0)) { |
| 3390 | if (l > 0) |
| 3391 | return -1; |
| 3392 | } |
| 3393 | |
| 3394 | /* |
| 3395 | * Find a new source address |
| 3396 | */ |
| 3397 | if (ipf_nat6_nextaddr(fin, &np->in_nsrc, &frnat.fin_src6, |
| 3398 | &frnat.fin_src6) == -1) { |
| 3399 | return -1; |
| 3400 | } |
| 3401 | |
| 3402 | if (IP6_ISZERO(&np->in_nsrcip6) && |
| 3403 | IP6_ISONES(&np->in_nsrcmsk6)) { |
| 3404 | src_search = 0; |
| 3405 | if (np->in_stepnext == 0) |
| 3406 | np->in_stepnext = 1; |
| 3407 | |
| 3408 | } else if (IP6_ISZERO(&np->in_nsrcip6) && |
| 3409 | IP6_ISZERO(&np->in_nsrcmsk6)) { |
| 3410 | src_search = 0; |
| 3411 | if (np->in_stepnext == 0) |
| 3412 | np->in_stepnext = 1; |
| 3413 | |
| 3414 | } else if (IP6_ISONES(&np->in_nsrcmsk)) { |
| 3415 | src_search = 0; |
| 3416 | if (np->in_stepnext == 0) |
| 3417 | np->in_stepnext = 1; |
| 3418 | |
| 3419 | } else if (!IP6_ISONES(&np->in_nsrcmsk6)) { |
| 3420 | if (np->in_stepnext == 0 && changed == -1) { |
| 3421 | IP6_INC(&np->in_snip); |
| 3422 | np->in_stepnext++; |
| 3423 | changed = 0; |
| 3424 | } |
| 3425 | } |
| 3426 | |
| 3427 | if ((flags & IPN_TCPUDPICMP) != 0) { |
| 3428 | if (np->in_spnext != 0) |
| 3429 | frnat.fin_data[0] = np->in_spnext; |
| 3430 | |
| 3431 | /* |
| 3432 | * Standard port translation. Select next port. |
| 3433 | */ |
| 3434 | if ((flags & IPN_FIXEDSPORT) != 0) { |
| 3435 | np->in_stepnext = 2; |
| 3436 | } else if ((np->in_stepnext == 1) && |
| 3437 | (changed == -1) && (natl != NULL)) { |
| 3438 | np->in_spnext++; |
| 3439 | np->in_stepnext++; |
| 3440 | changed = 1; |
| 3441 | if (np->in_spnext > np->in_spmax) |
| 3442 | np->in_spnext = np->in_spmin; |
| 3443 | } |
| 3444 | } else { |
| 3445 | np->in_stepnext = 2; |
| 3446 | } |
| 3447 | np->in_stepnext &= 0x3; |
| 3448 | |
| 3449 | /* |
| 3450 | * Find a new destination address |
| 3451 | */ |
| 3452 | /* TRACE (fin, np, l, frnat) */ |
| 3453 | |
| 3454 | if (ipf_nat6_nextaddr(fin, &np->in_ndst, &frnat.fin_dst6, |
| 3455 | &frnat.fin_dst6) == -1) |
| 3456 | return -1; |
| 3457 | |
| 3458 | if (IP6_ISZERO(&np->in_ndstip6) && |
| 3459 | IP6_ISONES(&np->in_ndstmsk6)) { |
| 3460 | dst_search = 0; |
| 3461 | if (np->in_stepnext == 2) |
| 3462 | np->in_stepnext = 3; |
| 3463 | |
| 3464 | } else if (IP6_ISZERO(&np->in_ndstip6) && |
| 3465 | IP6_ISZERO(&np->in_ndstmsk6)) { |
| 3466 | dst_search = 0; |
| 3467 | if (np->in_stepnext == 2) |
| 3468 | np->in_stepnext = 3; |
| 3469 | |
| 3470 | } else if (IP6_ISONES(&np->in_ndstmsk6)) { |
| 3471 | dst_search = 0; |
| 3472 | if (np->in_stepnext == 2) |
| 3473 | np->in_stepnext = 3; |
| 3474 | |
| 3475 | } else if (!IP6_ISONES(&np->in_ndstmsk6)) { |
| 3476 | if ((np->in_stepnext == 2) && (changed == -1) && |
| 3477 | (natl != NULL)) { |
| 3478 | changed = 2; |
| 3479 | np->in_stepnext++; |
| 3480 | IP6_INC(&np->in_dnip6); |
| 3481 | } |
| 3482 | } |
| 3483 | |
| 3484 | if ((flags & IPN_TCPUDPICMP) != 0) { |
| 3485 | if (np->in_dpnext != 0) |
| 3486 | frnat.fin_data[1] = np->in_dpnext; |
| 3487 | |
| 3488 | /* |
| 3489 | * Standard port translation. Select next port. |
| 3490 | */ |
| 3491 | if ((flags & IPN_FIXEDDPORT) != 0) { |
| 3492 | np->in_stepnext = 0; |
| 3493 | } else if (np->in_stepnext == 3 && changed == -1) { |
| 3494 | np->in_dpnext++; |
| 3495 | np->in_stepnext++; |
| 3496 | changed = 3; |
| 3497 | if (np->in_dpnext > np->in_dpmax) |
| 3498 | np->in_dpnext = np->in_dpmin; |
| 3499 | } |
| 3500 | } else { |
| 3501 | if (np->in_stepnext == 3) |
| 3502 | np->in_stepnext = 0; |
| 3503 | } |
| 3504 | |
| 3505 | /* TRACE (frnat) */ |
| 3506 | |
| 3507 | /* |
| 3508 | * Here we do a lookup of the connection as seen from |
| 3509 | * the outside. If an IP# pair already exists, try |
| 3510 | * again. So if you have A->B becomes C->B, you can |
| 3511 | * also have D->E become C->E but not D->B causing |
| 3512 | * another C->B. Also take protocol and ports into |
| 3513 | * account when determining whether a pre-existing |
| 3514 | * NAT setup will cause an external conflict where |
| 3515 | * this is appropriate. |
| 3516 | * |
| 3517 | * fin_data[] is swapped around because we are doing a |
| 3518 | * lookup of the packet is if it were moving in the opposite |
| 3519 | * direction of the one we are working with now. |
| 3520 | */ |
| 3521 | if (flags & IPN_TCPUDP) { |
| 3522 | swap = frnat.fin_data[0]; |
| 3523 | frnat.fin_data[0] = frnat.fin_data[1]; |
| 3524 | frnat.fin_data[1] = swap; |
| 3525 | } |
| 3526 | if (fin->fin_out == 1) { |
| 3527 | natl = ipf_nat6_inlookup(&frnat, |
| 3528 | flags & ~(SI_WILDP|NAT_SEARCH), |
| 3529 | (u_int)frnat.fin_p, |
| 3530 | &frnat.fin_dst6.in6, |
| 3531 | &frnat.fin_src6.in6); |
| 3532 | |
| 3533 | } else { |
| 3534 | natl = ipf_nat6_outlookup(&frnat, |
| 3535 | flags & ~(SI_WILDP|NAT_SEARCH), |
| 3536 | (u_int)frnat.fin_p, |
| 3537 | &frnat.fin_dst6.in6, |
| 3538 | &frnat.fin_src6.in6); |
| 3539 | } |
| 3540 | if (flags & IPN_TCPUDP) { |
| 3541 | swap = frnat.fin_data[0]; |
| 3542 | frnat.fin_data[0] = frnat.fin_data[1]; |
| 3543 | frnat.fin_data[1] = swap; |
| 3544 | } |
| 3545 | |
| 3546 | /* TRACE natl, in_stepnext, l */ |
| 3547 | |
| 3548 | if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */ |
| 3549 | return -1; |
| 3550 | |
| 3551 | np->in_stepnext &= 0x3; |
| 3552 | |
| 3553 | l++; |
| 3554 | changed = -1; |
| 3555 | } while (natl != NULL); |
| 3556 | nat->nat_osrc6 = fin->fin_src6; |
| 3557 | nat->nat_odst6 = fin->fin_dst6; |
| 3558 | nat->nat_nsrc6 = frnat.fin_src6; |
| 3559 | nat->nat_ndst6 = frnat.fin_dst6; |
| 3560 | |
| 3561 | if ((flags & IPN_TCPUDP) != 0) { |
| 3562 | nat->nat_osport = htons(fin->fin_data[0]); |
| 3563 | nat->nat_odport = htons(fin->fin_data[1]); |
| 3564 | nat->nat_nsport = htons(frnat.fin_data[0]); |
| 3565 | nat->nat_ndport = htons(frnat.fin_data[1]); |
| 3566 | } else if ((flags & IPN_ICMPQUERY) != 0) { |
| 3567 | nat->nat_oicmpid = fin->fin_data[1]; |
| 3568 | nat->nat_nicmpid = frnat.fin_data[1]; |
| 3569 | } |
| 3570 | |
| 3571 | return 0; |
| 3572 | } |
| 3573 | |
| 3574 | |
| 3575 | /* ------------------------------------------------------------------------ */ |
| 3576 | /* Function: ipf_nat6_newdivert */ |
| 3577 | /* Returns: int - -1 == error, 0 == success */ |
| 3578 | /* Parameters: fin(I) - pointer to packet information */ |
| 3579 | /* nat(I) - pointer to NAT entry */ |
| 3580 | /* ni(I) - pointer to structure with misc. information needed */ |
| 3581 | /* to create new NAT entry. */ |
| 3582 | /* Write Lock: ipf_nat */ |
| 3583 | /* */ |
| 3584 | /* Create a new NAT divert session as defined by the NAT rule. This is */ |
| 3585 | /* somewhat different to other NAT session creation routines because we */ |
| 3586 | /* do not iterate through either port numbers or IP addresses, searching */ |
| 3587 | /* for a unique mapping, however, a complimentary duplicate check is made. */ |
| 3588 | /* ------------------------------------------------------------------------ */ |
| 3589 | int |
| 3590 | ipf_nat6_newdivert(fr_info_t *fin, nat_t *nat, natinfo_t *nai) |
| 3591 | { |
| 3592 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3593 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3594 | fr_info_t frnat; |
| 3595 | ipnat_t *np; |
| 3596 | nat_t *natl; |
| 3597 | int p; |
| 3598 | |
| 3599 | np = nai->nai_np; |
| 3600 | bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); |
| 3601 | |
| 3602 | nat->nat_pr[0] = 0; |
| 3603 | nat->nat_osrc6 = fin->fin_src6; |
| 3604 | nat->nat_odst6 = fin->fin_dst6; |
| 3605 | nat->nat_osport = htons(fin->fin_data[0]); |
| 3606 | nat->nat_odport = htons(fin->fin_data[1]); |
| 3607 | frnat.fin_src6 = np->in_snip6; |
| 3608 | frnat.fin_dst6 = np->in_dnip6; |
| 3609 | |
| 3610 | if (np->in_redir & NAT_DIVERTUDP) { |
| 3611 | frnat.fin_data[0] = np->in_spnext; |
| 3612 | frnat.fin_data[1] = np->in_dpnext; |
| 3613 | frnat.fin_flx |= FI_TCPUDP; |
| 3614 | p = IPPROTO_UDP; |
| 3615 | } else { |
| 3616 | frnat.fin_flx &= ~FI_TCPUDP; |
| 3617 | p = IPPROTO_IPIP; |
| 3618 | } |
| 3619 | |
| 3620 | if (fin->fin_out == 1) { |
| 3621 | natl = ipf_nat6_inlookup(&frnat, 0, p, &frnat.fin_dst6.in6, |
| 3622 | &frnat.fin_src6.in6); |
| 3623 | |
| 3624 | } else { |
| 3625 | natl = ipf_nat6_outlookup(&frnat, 0, p, &frnat.fin_dst6.in6, |
| 3626 | &frnat.fin_src6.in6); |
| 3627 | } |
| 3628 | |
| 3629 | if (natl != NULL) { |
| 3630 | NBUMPSIDE6D(fin->fin_out, ns_divert_exist); |
| 3631 | return -1; |
| 3632 | } |
| 3633 | |
| 3634 | nat->nat_nsrc6 = frnat.fin_src6; |
| 3635 | nat->nat_ndst6 = frnat.fin_dst6; |
| 3636 | if (np->in_redir & NAT_DIVERTUDP) { |
| 3637 | nat->nat_nsport = htons(frnat.fin_data[0]); |
| 3638 | nat->nat_ndport = htons(frnat.fin_data[1]); |
| 3639 | } |
| 3640 | nat->nat_pr[fin->fin_out] = fin->fin_p; |
| 3641 | nat->nat_pr[1 - fin->fin_out] = p; |
| 3642 | |
| 3643 | if (np->in_redir & NAT_REDIRECT) |
| 3644 | nat->nat_dir = NAT_DIVERTIN; |
| 3645 | else |
| 3646 | nat->nat_dir = NAT_DIVERTOUT; |
| 3647 | |
| 3648 | return 0; |
| 3649 | } |
| 3650 | |
| 3651 | |
| 3652 | /* ------------------------------------------------------------------------ */ |
| 3653 | /* Function: nat6_builddivertmp */ |
| 3654 | /* Returns: int - -1 == error, 0 == success */ |
| 3655 | /* Parameters: np(I) - pointer to a NAT rule */ |
| 3656 | /* */ |
| 3657 | /* For divert rules, a skeleton packet representing what will be prepended */ |
| 3658 | /* to the real packet is created. Even though we don't have the full */ |
| 3659 | /* packet here, a checksum is calculated that we update later when we */ |
| 3660 | /* fill in the final details. At present a 0 checksum for UDP is being set */ |
| 3661 | /* here because it is expected that divert will be used for localhost. */ |
| 3662 | /* ------------------------------------------------------------------------ */ |
| 3663 | static int |
| 3664 | ipf_nat6_builddivertmp(ipf_nat_softc_t *softn, ipnat_t *np) |
| 3665 | { |
| 3666 | udphdr_t *uh; |
| 3667 | size_t len; |
| 3668 | ip6_t *ip6; |
| 3669 | |
| 3670 | if ((np->in_redir & NAT_DIVERTUDP) != 0) |
| 3671 | len = sizeof(ip6_t) + sizeof(udphdr_t); |
| 3672 | else |
| 3673 | len = sizeof(ip6_t); |
| 3674 | |
| 3675 | ALLOC_MB_T(np->in_divmp, len); |
| 3676 | if (np->in_divmp == NULL) { |
| 3677 | ATOMIC_INCL(softn->ipf_nat_stats.ns_divert_build); |
| 3678 | return -1; |
| 3679 | } |
| 3680 | |
| 3681 | /* |
| 3682 | * First, the header to get the packet diverted to the new destination |
| 3683 | */ |
| 3684 | ip6 = MTOD(np->in_divmp, ip6_t *); |
| 3685 | ip6->ip6_vfc = 0x60; |
| 3686 | if ((np->in_redir & NAT_DIVERTUDP) != 0) |
| 3687 | ip6->ip6_nxt = IPPROTO_UDP; |
| 3688 | else |
| 3689 | ip6->ip6_nxt = IPPROTO_IPIP; |
| 3690 | ip6->ip6_hlim = 255; |
| 3691 | ip6->ip6_plen = 0; |
| 3692 | ip6->ip6_src = np->in_snip6.in6; |
| 3693 | ip6->ip6_dst = np->in_dnip6.in6; |
| 3694 | |
| 3695 | if (np->in_redir & NAT_DIVERTUDP) { |
| 3696 | uh = (udphdr_t *)((u_char *)ip6 + sizeof(*ip6)); |
| 3697 | uh->uh_sum = 0; |
| 3698 | uh->uh_ulen = 8; |
| 3699 | uh->uh_sport = htons(np->in_spnext); |
| 3700 | uh->uh_dport = htons(np->in_dpnext); |
| 3701 | } |
| 3702 | |
| 3703 | return 0; |
| 3704 | } |
| 3705 | |
| 3706 | |
| 3707 | #define MINDECAP (sizeof(ip6_t) + sizeof(udphdr_t) + sizeof(ip6_t)) |
| 3708 | |
| 3709 | /* ------------------------------------------------------------------------ */ |
| 3710 | /* Function: nat6_decap */ |
| 3711 | /* Returns: int - -1 == error, 0 == success */ |
| 3712 | /* Parameters: fin(I) - pointer to packet information */ |
| 3713 | /* nat(I) - pointer to current NAT session */ |
| 3714 | /* */ |
| 3715 | /* This function is responsible for undoing a packet's encapsulation in the */ |
| 3716 | /* reverse of an encap/divert rule. After removing the outer encapsulation */ |
| 3717 | /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/ |
| 3718 | /* match the "new" packet as it may still be used by IPFilter elsewhere. */ |
| 3719 | /* We use "dir" here as the basis for some of the expectations about the */ |
| 3720 | /* outer header. If we return an error, the goal is to leave the original */ |
| 3721 | /* packet information undisturbed - this falls short at the end where we'd */ |
| 3722 | /* need to back a backup copy of "fin" - expensive. */ |
| 3723 | /* ------------------------------------------------------------------------ */ |
| 3724 | static int |
| 3725 | ipf_nat6_decap(fr_info_t *fin, nat_t *nat) |
| 3726 | { |
| 3727 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3728 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3729 | char *hdr; |
| 3730 | int skip; |
| 3731 | mb_t *m; |
| 3732 | |
| 3733 | if ((fin->fin_flx & FI_ICMPERR) != 0) { |
| 3734 | return 0; |
| 3735 | } |
| 3736 | |
| 3737 | m = fin->fin_m; |
| 3738 | skip = fin->fin_hlen; |
| 3739 | |
| 3740 | switch (nat->nat_dir) |
| 3741 | { |
| 3742 | case NAT_DIVERTIN : |
| 3743 | case NAT_DIVERTOUT : |
| 3744 | if (fin->fin_plen < MINDECAP) |
| 3745 | return -1; |
| 3746 | skip += sizeof(udphdr_t); |
| 3747 | break; |
| 3748 | |
| 3749 | case NAT_ENCAPIN : |
| 3750 | case NAT_ENCAPOUT : |
| 3751 | if (fin->fin_plen < (skip + sizeof(ip6_t))) |
| 3752 | return -1; |
| 3753 | break; |
| 3754 | default : |
| 3755 | return -1; |
| 3756 | /* NOTREACHED */ |
| 3757 | } |
| 3758 | |
| 3759 | /* |
| 3760 | * The aim here is to keep the original packet details in "fin" for |
| 3761 | * as long as possible so that returning with an error is for the |
| 3762 | * original packet and there is little undoing work to do. |
| 3763 | */ |
| 3764 | if (M_LEN(m) < skip + sizeof(ip6_t)) { |
| 3765 | if (ipf_pr_pullup(fin, skip + sizeof(ip6_t)) == -1) |
| 3766 | return -1; |
| 3767 | } |
| 3768 | |
| 3769 | hdr = MTOD(fin->fin_m, char *); |
| 3770 | fin->fin_ip6 = (ip6_t *)(hdr + skip); |
| 3771 | |
| 3772 | if (ipf_pr_pullup(fin, skip + sizeof(ip6_t)) == -1) { |
| 3773 | NBUMPSIDE6D(fin->fin_out, ns_decap_pullup); |
| 3774 | return -1; |
| 3775 | } |
| 3776 | |
| 3777 | fin->fin_hlen = sizeof(ip6_t); |
| 3778 | fin->fin_dlen -= skip; |
| 3779 | fin->fin_plen -= skip; |
| 3780 | fin->fin_ipoff += skip; |
| 3781 | |
| 3782 | if (ipf_makefrip(sizeof(ip6_t), (ip_t *)hdr, fin) == -1) { |
| 3783 | NBUMPSIDE6D(fin->fin_out, ns_decap_bad); |
| 3784 | return -1; |
| 3785 | } |
| 3786 | |
| 3787 | return skip; |
| 3788 | } |
| 3789 | |
| 3790 | |
| 3791 | /* ------------------------------------------------------------------------ */ |
| 3792 | /* Function: nat6_nextaddr */ |
| 3793 | /* Returns: int - -1 == bad input (no new address), */ |
| 3794 | /* 0 == success and dst has new address */ |
| 3795 | /* Parameters: fin(I) - pointer to packet information */ |
| 3796 | /* na(I) - how to generate new address */ |
| 3797 | /* old(I) - original address being replaced */ |
| 3798 | /* dst(O) - where to put the new address */ |
| 3799 | /* Write Lock: ipf_nat */ |
| 3800 | /* */ |
| 3801 | /* This function uses the contents of the "na" structure, in combination */ |
| 3802 | /* with "old" to produce a new address to store in "dst". Not all of the */ |
| 3803 | /* possible uses of "na" will result in a new address. */ |
| 3804 | /* ------------------------------------------------------------------------ */ |
| 3805 | static int |
| 3806 | ipf_nat6_nextaddr(fr_info_t *fin, nat_addr_t *na, i6addr_t *old, i6addr_t *dst) |
| 3807 | { |
| 3808 | ipf_main_softc_t *softc = fin->fin_main_soft; |
| 3809 | ipf_nat_softc_t *softn = softc->ipf_nat_soft; |
| 3810 | i6addr_t newip, new; |
| 3811 | u_32_t amin, amax; |
| 3812 | int error; |
| 3813 | |
| 3814 | new.i6[0] = 0; |
| 3815 | new.i6[1] = 0; |
| 3816 | new.i6[2] = 0; |
| 3817 | new.i6[3] = 0; |
| 3818 | amin = na->na_addr[0].in4.s_addr; |
| 3819 | |
| 3820 | switch (na->na_atype) |
| 3821 | { |
| 3822 | case FRI_RANGE : |
| 3823 | amax = na->na_addr[1].in4.s_addr; |
| 3824 | break; |
| 3825 | |
| 3826 | case FRI_NETMASKED : |
| 3827 | case FRI_DYNAMIC : |
| 3828 | case FRI_NORMAL : |
| 3829 | /* |
| 3830 | * Compute the maximum address by adding the inverse of the |
| 3831 | * netmask to the minimum address. |
| 3832 | */ |
| 3833 | amax = ~na->na_addr[1].in4.s_addr; |
| 3834 | amax |= amin; |
| 3835 | break; |
| 3836 | |
| 3837 | case FRI_LOOKUP : |
| 3838 | break; |
| 3839 | |
| 3840 | case FRI_BROADCAST : |
| 3841 | case FRI_PEERADDR : |
| 3842 | case FRI_NETWORK : |
| 3843 | default : |
| 3844 | return -1; |
| 3845 | } |
| 3846 | |
| 3847 | error = -1; |
| 3848 | switch (na->na_function) |
| 3849 | { |
| 3850 | case IPLT_DSTLIST : |
| 3851 | error = ipf_dstlist_select_node(fin, na->na_ptr, dst->i6, |
| 3852 | NULL); |
| 3853 | break; |
| 3854 | |
| 3855 | case IPLT_NONE : |
| 3856 | /* |
| 3857 | * 0/0 as the new address means leave it alone. |
| 3858 | */ |
| 3859 | if (na->na_addr[0].in4.s_addr == 0 && |
| 3860 | na->na_addr[1].in4.s_addr == 0) { |
| 3861 | new = *old; |
| 3862 | |
| 3863 | /* |
| 3864 | * 0/32 means get the interface's address |
| 3865 | */ |
| 3866 | } else if (IP6_ISZERO(&na->na_addr[0].in6) && |
| 3867 | IP6_ISONES(&na->na_addr[1].in6)) { |
| 3868 | if (ipf_ifpaddr(softc, 6, na->na_atype, |
| 3869 | fin->fin_ifp, &newip, NULL) == -1) { |
| 3870 | NBUMPSIDE6(fin->fin_out, ns_ifpaddrfail); |
| 3871 | return -1; |
| 3872 | } |
| 3873 | new = newip; |
| 3874 | } else { |
| 3875 | new.in6 = na->na_nextip6; |
| 3876 | } |
| 3877 | *dst = new; |
| 3878 | error = 0; |
| 3879 | break; |
| 3880 | |
| 3881 | default : |
| 3882 | NBUMPSIDE6(fin->fin_out, ns_badnextaddr); |
| 3883 | break; |
| 3884 | } |
| 3885 | |
| 3886 | return error; |
| 3887 | } |
| 3888 | |
| 3889 | |
| 3890 | /* ------------------------------------------------------------------------ */ |
| 3891 | /* Function: ipf_nat6_nextaddrinit */ |
| 3892 | /* Returns: int - 0 == success, else error number */ |
| 3893 | /* Parameters: na(I) - NAT address information for generating new addr*/ |
| 3894 | /* base(I) - start of where to find strings */ |
| 3895 | /* initial(I) - flag indicating if it is the first call for */ |
| 3896 | /* this "na" structure. */ |
| 3897 | /* ifp(I) - network interface to derive address */ |
| 3898 | /* information from. */ |
| 3899 | /* */ |
| 3900 | /* This function is expected to be called in two scenarious: when a new NAT */ |
| 3901 | /* rule is loaded into the kernel and when the list of NAT rules is sync'd */ |
| 3902 | /* up with the valid network interfaces (possibly due to them changing.) */ |
| 3903 | /* To distinguish between these, the "initial" parameter is used. If it is */ |
| 3904 | /* 1 then this indicates the rule has just been reloaded and 0 for when we */ |
| 3905 | /* are updating information. This difference is important because in */ |
| 3906 | /* instances where we are not updating address information associated with */ |
| 3907 | /* a network interface, we don't want to disturb what the "next" address to */ |
| 3908 | /* come out of ipf_nat6_nextaddr() will be. */ |
| 3909 | /* ------------------------------------------------------------------------ */ |
| 3910 | static int |
| 3911 | ipf_nat6_nextaddrinit(ipf_main_softc_t *softc, char *base, nat_addr_t *na, |
| 3912 | int initial, void *ifp) |
| 3913 | { |
| 3914 | switch (na->na_atype) |
| 3915 | { |
| 3916 | case FRI_LOOKUP : |
| 3917 | if (na->na_subtype == 0) { |
| 3918 | na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT, |
| 3919 | na->na_type, |
| 3920 | na->na_num, |
| 3921 | &na->na_func); |
| 3922 | } else if (na->na_subtype == 1) { |
| 3923 | na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT, |
| 3924 | na->na_type, |
| 3925 | base + na->na_num, |
| 3926 | &na->na_func); |
| 3927 | } |
| 3928 | if (na->na_func == NULL) { |
| 3929 | IPFERROR(60072); |
| 3930 | return ESRCH; |
| 3931 | } |
| 3932 | if (na->na_ptr == NULL) { |
| 3933 | IPFERROR(60073); |
| 3934 | return ESRCH; |
| 3935 | } |
| 3936 | break; |
| 3937 | case FRI_DYNAMIC : |
| 3938 | case FRI_BROADCAST : |
| 3939 | case FRI_NETWORK : |
| 3940 | case FRI_NETMASKED : |
| 3941 | case FRI_PEERADDR : |
| 3942 | if (ifp != NULL) |
| 3943 | (void )ipf_ifpaddr(softc, 6, na->na_atype, ifp, |
| 3944 | &na->na_addr[0], |
| 3945 | &na->na_addr[1]); |
| 3946 | break; |
| 3947 | |
| 3948 | case FRI_SPLIT : |
| 3949 | case FRI_RANGE : |
| 3950 | if (initial) |
| 3951 | na->na_nextip6 = na->na_addr[0].in6; |
| 3952 | break; |
| 3953 | |
| 3954 | case FRI_NONE : |
| 3955 | IP6_ANDASSIGN(&na->na_addr[0].in6, &na->na_addr[1].in6); |
| 3956 | return 0; |
| 3957 | |
| 3958 | case FRI_NORMAL : |
| 3959 | IP6_ANDASSIGN(&na->na_addr[0].in6, &na->na_addr[1].in6); |
| 3960 | break; |
| 3961 | |
| 3962 | default : |
| 3963 | IPFERROR(60074); |
| 3964 | return EINVAL; |
| 3965 | } |
| 3966 | |
| 3967 | if (initial && (na->na_atype == FRI_NORMAL)) { |
| 3968 | if (IP6_ISZERO(&na->na_addr[0].in6)) { |
| 3969 | if (IP6_ISONES(&na->na_addr[1].in6) || |
| 3970 | IP6_ISZERO(&na->na_addr[1].in6)) { |
| 3971 | return 0; |
| 3972 | } |
| 3973 | } |
| 3974 | |
| 3975 | na->na_nextip6 = na->na_addr[0].in6; |
| 3976 | if (!IP6_ISONES(&na->na_addr[1].in6)) { |
| 3977 | IP6_INC(&na->na_nextip6); |
| 3978 | } |
| 3979 | } |
| 3980 | |
| 3981 | return 0; |
| 3982 | } |
| 3983 | |
| 3984 | |
| 3985 | /* ------------------------------------------------------------------------ */ |
| 3986 | /* Function: ipf_nat6_icmpquerytype */ |
| 3987 | /* Returns: int - 1 == success, 0 == failure */ |
| 3988 | /* Parameters: icmptype(I) - ICMP type number */ |
| 3989 | /* */ |
| 3990 | /* Tests to see if the ICMP type number passed is a query/response type or */ |
| 3991 | /* not. */ |
| 3992 | /* ------------------------------------------------------------------------ */ |
| 3993 | static int |
| 3994 | ipf_nat6_icmpquerytype(int icmptype) |
| 3995 | { |
| 3996 | |
| 3997 | /* |
| 3998 | * For the ICMP query NAT code, it is essential that both the query |
| 3999 | * and the reply match on the NAT rule. Because the NAT structure |
| 4000 | * does not keep track of the icmptype, and a single NAT structure |
| 4001 | * is used for all icmp types with the same src, dest and id, we |
| 4002 | * simply define the replies as queries as well. The funny thing is, |
| 4003 | * altough it seems silly to call a reply a query, this is exactly |
| 4004 | * as it is defined in the IPv4 specification |
| 4005 | */ |
| 4006 | |
| 4007 | switch (icmptype) |
| 4008 | { |
| 4009 | |
| 4010 | case ICMP6_ECHO_REPLY: |
| 4011 | case ICMP6_ECHO_REQUEST: |
| 4012 | /* route aedvertisement/solliciation is currently unsupported: */ |
| 4013 | /* it would require rewriting the ICMP data section */ |
| 4014 | case ICMP6_MEMBERSHIP_QUERY: |
| 4015 | case ICMP6_MEMBERSHIP_REPORT: |
| 4016 | case ICMP6_MEMBERSHIP_REDUCTION: |
| 4017 | case ICMP6_WRUREQUEST: |
| 4018 | case ICMP6_WRUREPLY: |
| 4019 | case MLD6_MTRACE_RESP: |
| 4020 | case MLD6_MTRACE: |
| 4021 | return 1; |
| 4022 | default: |
| 4023 | return 0; |
| 4024 | } |
| 4025 | } |
| 4026 | #endif /* USE_INET6 */ |
| 4027 | |