| 1 | /* $NetBSD: ip_sync.c,v 1.5 2013/09/14 12:18:06 martin Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 2012 by Darren Reed. |
| 5 | * |
| 6 | * See the IPFILTER.LICENCE file for details on licencing. |
| 7 | */ |
| 8 | #if defined(KERNEL) || defined(_KERNEL) |
| 9 | # undef KERNEL |
| 10 | # undef _KERNEL |
| 11 | # define KERNEL 1 |
| 12 | # define _KERNEL 1 |
| 13 | #endif |
| 14 | #include <sys/errno.h> |
| 15 | #include <sys/types.h> |
| 16 | #include <sys/param.h> |
| 17 | #include <sys/file.h> |
| 18 | #if !defined(_KERNEL) && !defined(__KERNEL__) |
| 19 | # include <stdio.h> |
| 20 | # include <stdlib.h> |
| 21 | # include <string.h> |
| 22 | # define _KERNEL |
| 23 | # define KERNEL |
| 24 | # ifdef __OpenBSD__ |
| 25 | struct file; |
| 26 | # endif |
| 27 | # include <sys/uio.h> |
| 28 | # undef _KERNEL |
| 29 | # undef KERNEL |
| 30 | #else |
| 31 | # include <sys/systm.h> |
| 32 | # if !defined(__SVR4) && !defined(__svr4__) |
| 33 | # include <sys/mbuf.h> |
| 34 | # endif |
| 35 | # include <sys/select.h> |
| 36 | # if __FreeBSD_version >= 500000 |
| 37 | # include <sys/selinfo.h> |
| 38 | # endif |
| 39 | #endif |
| 40 | #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104000000) |
| 41 | # include <sys/proc.h> |
| 42 | #endif |
| 43 | #if defined(_KERNEL) && (__FreeBSD_version >= 220000) |
| 44 | # include <sys/filio.h> |
| 45 | # include <sys/fcntl.h> |
| 46 | #else |
| 47 | # include <sys/ioctl.h> |
| 48 | #endif |
| 49 | #include <sys/time.h> |
| 50 | #if !defined(linux) |
| 51 | # include <sys/protosw.h> |
| 52 | #endif |
| 53 | #include <sys/socket.h> |
| 54 | #if defined(__SVR4) || defined(__svr4__) |
| 55 | # include <sys/filio.h> |
| 56 | # include <sys/byteorder.h> |
| 57 | # ifdef _KERNEL |
| 58 | # include <sys/dditypes.h> |
| 59 | # endif |
| 60 | # include <sys/stream.h> |
| 61 | # include <sys/kmem.h> |
| 62 | #endif |
| 63 | |
| 64 | #include <net/if.h> |
| 65 | #ifdef sun |
| 66 | # include <net/af.h> |
| 67 | #endif |
| 68 | #include <netinet/in.h> |
| 69 | #include <netinet/in_systm.h> |
| 70 | #include <netinet/ip.h> |
| 71 | #include <netinet/tcp.h> |
| 72 | #if !defined(linux) |
| 73 | # include <netinet/ip_var.h> |
| 74 | #endif |
| 75 | #if !defined(__hpux) && !defined(linux) |
| 76 | # include <netinet/tcp_fsm.h> |
| 77 | #endif |
| 78 | #include <netinet/udp.h> |
| 79 | #include <netinet/ip_icmp.h> |
| 80 | #include "netinet/ip_compat.h" |
| 81 | #include <netinet/tcpip.h> |
| 82 | #include "netinet/ip_fil.h" |
| 83 | #include "netinet/ip_nat.h" |
| 84 | #include "netinet/ip_frag.h" |
| 85 | #include "netinet/ip_state.h" |
| 86 | #include "netinet/ip_proxy.h" |
| 87 | #include "netinet/ip_sync.h" |
| 88 | #ifdef USE_INET6 |
| 89 | #include <netinet/icmp6.h> |
| 90 | #endif |
| 91 | #if (__FreeBSD_version >= 300000) |
| 92 | # include <sys/malloc.h> |
| 93 | # if defined(_KERNEL) && !defined(IPFILTER_LKM) |
| 94 | # include <sys/libkern.h> |
| 95 | # include <sys/systm.h> |
| 96 | # endif |
| 97 | #endif |
| 98 | /* END OF INCLUDES */ |
| 99 | |
| 100 | #if !defined(lint) |
| 101 | #if defined(__NetBSD__) |
| 102 | #include <sys/cdefs.h> |
| 103 | __KERNEL_RCSID(0, "$NetBSD: ip_sync.c,v 1.5 2013/09/14 12:18:06 martin Exp $" ); |
| 104 | #else |
| 105 | static const char rcsid[] = "@(#)Id: ip_sync.c,v 1.1.1.2 2012/07/22 13:45:38 darrenr Exp" ; |
| 106 | #endif |
| 107 | #endif |
| 108 | |
| 109 | #define SYNC_STATETABSZ 256 |
| 110 | #define SYNC_NATTABSZ 256 |
| 111 | |
| 112 | typedef struct ipf_sync_softc_s { |
| 113 | ipfmutex_t ipf_syncadd; |
| 114 | ipfmutex_t ipsl_mutex; |
| 115 | ipfrwlock_t ipf_syncstate; |
| 116 | ipfrwlock_t ipf_syncnat; |
| 117 | #if SOLARIS && defined(_KERNEL) |
| 118 | kcondvar_t ipslwait; |
| 119 | #endif |
| 120 | #if defined(linux) && defined(_KERNEL) |
| 121 | wait_queue_head_t sl_tail_linux; |
| 122 | #endif |
| 123 | synclist_t **syncstatetab; |
| 124 | synclist_t **syncnattab; |
| 125 | synclogent_t *synclog; |
| 126 | syncupdent_t *syncupd; |
| 127 | u_int ipf_sync_num; |
| 128 | u_int ipf_sync_wrap; |
| 129 | u_int sl_idx; /* next available sync log entry */ |
| 130 | u_int su_idx; /* next available sync update entry */ |
| 131 | u_int sl_tail; /* next sync log entry to read */ |
| 132 | u_int su_tail; /* next sync update entry to read */ |
| 133 | int ipf_sync_log_sz; |
| 134 | int ipf_sync_nat_tab_sz; |
| 135 | int ipf_sync_state_tab_sz; |
| 136 | int ipf_sync_debug; |
| 137 | int ipf_sync_events; |
| 138 | u_32_t ipf_sync_lastwakeup; |
| 139 | int ipf_sync_wake_interval; |
| 140 | int ipf_sync_event_high_wm; |
| 141 | int ipf_sync_queue_high_wm; |
| 142 | int ipf_sync_inited; |
| 143 | } ipf_sync_softc_t; |
| 144 | |
| 145 | static int ipf_sync_flush_table(ipf_sync_softc_t *, int, synclist_t **); |
| 146 | static void ipf_sync_wakeup(ipf_main_softc_t *); |
| 147 | static void ipf_sync_del(ipf_sync_softc_t *, synclist_t *); |
| 148 | static void ipf_sync_poll_wakeup(ipf_main_softc_t *); |
| 149 | static int ipf_sync_nat(ipf_main_softc_t *, synchdr_t *, void *); |
| 150 | static int ipf_sync_state(ipf_main_softc_t *, synchdr_t *, void *); |
| 151 | |
| 152 | # if !defined(sparc) && !defined(__hppa) |
| 153 | void ipf_sync_tcporder(int, struct tcpdata *); |
| 154 | void ipf_sync_natorder(int, struct nat *); |
| 155 | void ipf_sync_storder(int, struct ipstate *); |
| 156 | # endif |
| 157 | |
| 158 | |
| 159 | void * |
| 160 | ipf_sync_soft_create(ipf_main_softc_t *softc) |
| 161 | { |
| 162 | ipf_sync_softc_t *softs; |
| 163 | |
| 164 | KMALLOC(softs, ipf_sync_softc_t *); |
| 165 | if (softs == NULL) { |
| 166 | IPFERROR(110024); |
| 167 | return NULL; |
| 168 | } |
| 169 | |
| 170 | bzero((char *)softs, sizeof(*softs)); |
| 171 | |
| 172 | softs->ipf_sync_log_sz = SYNCLOG_SZ; |
| 173 | softs->ipf_sync_nat_tab_sz = SYNC_STATETABSZ; |
| 174 | softs->ipf_sync_state_tab_sz = SYNC_STATETABSZ; |
| 175 | softs->ipf_sync_event_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ |
| 176 | softs->ipf_sync_queue_high_wm = SYNCLOG_SZ * 100 / 90; /* 90% */ |
| 177 | |
| 178 | return softs; |
| 179 | } |
| 180 | |
| 181 | |
| 182 | /* ------------------------------------------------------------------------ */ |
| 183 | /* Function: ipf_sync_init */ |
| 184 | /* Returns: int - 0 == success, -1 == failure */ |
| 185 | /* Parameters: Nil */ |
| 186 | /* */ |
| 187 | /* Initialise all of the locks required for the sync code and initialise */ |
| 188 | /* any data structures, as required. */ |
| 189 | /* ------------------------------------------------------------------------ */ |
| 190 | int |
| 191 | ipf_sync_soft_init(ipf_main_softc_t *softc, void *arg) |
| 192 | { |
| 193 | ipf_sync_softc_t *softs = arg; |
| 194 | |
| 195 | KMALLOCS(softs->synclog, synclogent_t *, |
| 196 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
| 197 | if (softs->synclog == NULL) |
| 198 | return -1; |
| 199 | bzero((char *)softs->synclog, |
| 200 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
| 201 | |
| 202 | KMALLOCS(softs->syncupd, syncupdent_t *, |
| 203 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
| 204 | if (softs->syncupd == NULL) |
| 205 | return -2; |
| 206 | bzero((char *)softs->syncupd, |
| 207 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
| 208 | |
| 209 | KMALLOCS(softs->syncstatetab, synclist_t **, |
| 210 | softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); |
| 211 | if (softs->syncstatetab == NULL) |
| 212 | return -3; |
| 213 | bzero((char *)softs->syncstatetab, |
| 214 | softs->ipf_sync_state_tab_sz * sizeof(*softs->syncstatetab)); |
| 215 | |
| 216 | KMALLOCS(softs->syncnattab, synclist_t **, |
| 217 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
| 218 | if (softs->syncnattab == NULL) |
| 219 | return -3; |
| 220 | bzero((char *)softs->syncnattab, |
| 221 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
| 222 | |
| 223 | softs->ipf_sync_num = 1; |
| 224 | softs->ipf_sync_wrap = 0; |
| 225 | softs->sl_idx = 0; |
| 226 | softs->su_idx = 0; |
| 227 | softs->sl_tail = 0; |
| 228 | softs->su_tail = 0; |
| 229 | softs->ipf_sync_events = 0; |
| 230 | softs->ipf_sync_lastwakeup = 0; |
| 231 | |
| 232 | |
| 233 | # if SOLARIS && defined(_KERNEL) |
| 234 | cv_init(&softs->ipslwait, "ipsl condvar" , CV_DRIVER, NULL); |
| 235 | # endif |
| 236 | RWLOCK_INIT(&softs->ipf_syncstate, "add things to state sync table" ); |
| 237 | RWLOCK_INIT(&softs->ipf_syncnat, "add things to nat sync table" ); |
| 238 | MUTEX_INIT(&softs->ipf_syncadd, "add things to sync table" ); |
| 239 | MUTEX_INIT(&softs->ipsl_mutex, "read ring lock" ); |
| 240 | |
| 241 | softs->ipf_sync_inited = 1; |
| 242 | |
| 243 | return 0; |
| 244 | } |
| 245 | |
| 246 | |
| 247 | /* ------------------------------------------------------------------------ */ |
| 248 | /* Function: ipf_sync_unload */ |
| 249 | /* Returns: int - 0 == success, -1 == failure */ |
| 250 | /* Parameters: Nil */ |
| 251 | /* */ |
| 252 | /* Destroy the locks created when initialising and free any memory in use */ |
| 253 | /* with the synchronisation tables. */ |
| 254 | /* ------------------------------------------------------------------------ */ |
| 255 | int |
| 256 | ipf_sync_soft_fini(ipf_main_softc_t *softc, void *arg) |
| 257 | { |
| 258 | ipf_sync_softc_t *softs = arg; |
| 259 | |
| 260 | if (softs->syncnattab != NULL) { |
| 261 | ipf_sync_flush_table(softs, softs->ipf_sync_nat_tab_sz, |
| 262 | softs->syncnattab); |
| 263 | KFREES(softs->syncnattab, |
| 264 | softs->ipf_sync_nat_tab_sz * sizeof(*softs->syncnattab)); |
| 265 | softs->syncnattab = NULL; |
| 266 | } |
| 267 | |
| 268 | if (softs->syncstatetab != NULL) { |
| 269 | ipf_sync_flush_table(softs, softs->ipf_sync_state_tab_sz, |
| 270 | softs->syncstatetab); |
| 271 | KFREES(softs->syncstatetab, |
| 272 | softs->ipf_sync_state_tab_sz * |
| 273 | sizeof(*softs->syncstatetab)); |
| 274 | softs->syncstatetab = NULL; |
| 275 | } |
| 276 | |
| 277 | if (softs->syncupd != NULL) { |
| 278 | KFREES(softs->syncupd, |
| 279 | softs->ipf_sync_log_sz * sizeof(*softs->syncupd)); |
| 280 | softs->syncupd = NULL; |
| 281 | } |
| 282 | |
| 283 | if (softs->synclog != NULL) { |
| 284 | KFREES(softs->synclog, |
| 285 | softs->ipf_sync_log_sz * sizeof(*softs->synclog)); |
| 286 | softs->synclog = NULL; |
| 287 | } |
| 288 | |
| 289 | if (softs->ipf_sync_inited == 1) { |
| 290 | MUTEX_DESTROY(&softs->ipsl_mutex); |
| 291 | MUTEX_DESTROY(&softs->ipf_syncadd); |
| 292 | RW_DESTROY(&softs->ipf_syncnat); |
| 293 | RW_DESTROY(&softs->ipf_syncstate); |
| 294 | softs->ipf_sync_inited = 0; |
| 295 | } |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | void |
| 301 | ipf_sync_soft_destroy(ipf_main_softc_t *softc, void *arg) |
| 302 | { |
| 303 | ipf_sync_softc_t *softs = arg; |
| 304 | |
| 305 | KFREE(softs); |
| 306 | } |
| 307 | |
| 308 | |
| 309 | # if !defined(sparc) && !defined(__hppa) |
| 310 | /* ------------------------------------------------------------------------ */ |
| 311 | /* Function: ipf_sync_tcporder */ |
| 312 | /* Returns: Nil */ |
| 313 | /* Parameters: way(I) - direction of byte order conversion. */ |
| 314 | /* td(IO) - pointer to data to be converted. */ |
| 315 | /* */ |
| 316 | /* Do byte swapping on values in the TCP state information structure that */ |
| 317 | /* need to be used at both ends by the host in their native byte order. */ |
| 318 | /* ------------------------------------------------------------------------ */ |
| 319 | void |
| 320 | ipf_sync_tcporder(int way, tcpdata_t *td) |
| 321 | { |
| 322 | if (way) { |
| 323 | td->td_maxwin = htons(td->td_maxwin); |
| 324 | td->td_end = htonl(td->td_end); |
| 325 | td->td_maxend = htonl(td->td_maxend); |
| 326 | } else { |
| 327 | td->td_maxwin = ntohs(td->td_maxwin); |
| 328 | td->td_end = ntohl(td->td_end); |
| 329 | td->td_maxend = ntohl(td->td_maxend); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | |
| 334 | /* ------------------------------------------------------------------------ */ |
| 335 | /* Function: ipf_sync_natorder */ |
| 336 | /* Returns: Nil */ |
| 337 | /* Parameters: way(I) - direction of byte order conversion. */ |
| 338 | /* nat(IO) - pointer to data to be converted. */ |
| 339 | /* */ |
| 340 | /* Do byte swapping on values in the NAT data structure that need to be */ |
| 341 | /* used at both ends by the host in their native byte order. */ |
| 342 | /* ------------------------------------------------------------------------ */ |
| 343 | void |
| 344 | ipf_sync_natorder(int way, nat_t *n) |
| 345 | { |
| 346 | if (way) { |
| 347 | n->nat_age = htonl(n->nat_age); |
| 348 | n->nat_flags = htonl(n->nat_flags); |
| 349 | n->nat_ipsumd = htonl(n->nat_ipsumd); |
| 350 | n->nat_use = htonl(n->nat_use); |
| 351 | n->nat_dir = htonl(n->nat_dir); |
| 352 | } else { |
| 353 | n->nat_age = ntohl(n->nat_age); |
| 354 | n->nat_flags = ntohl(n->nat_flags); |
| 355 | n->nat_ipsumd = ntohl(n->nat_ipsumd); |
| 356 | n->nat_use = ntohl(n->nat_use); |
| 357 | n->nat_dir = ntohl(n->nat_dir); |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | |
| 362 | /* ------------------------------------------------------------------------ */ |
| 363 | /* Function: ipf_sync_storder */ |
| 364 | /* Returns: Nil */ |
| 365 | /* Parameters: way(I) - direction of byte order conversion. */ |
| 366 | /* ips(IO) - pointer to data to be converted. */ |
| 367 | /* */ |
| 368 | /* Do byte swapping on values in the IP state data structure that need to */ |
| 369 | /* be used at both ends by the host in their native byte order. */ |
| 370 | /* ------------------------------------------------------------------------ */ |
| 371 | void |
| 372 | ipf_sync_storder(int way, ipstate_t *ips) |
| 373 | { |
| 374 | ipf_sync_tcporder(way, &ips->is_tcp.ts_data[0]); |
| 375 | ipf_sync_tcporder(way, &ips->is_tcp.ts_data[1]); |
| 376 | |
| 377 | if (way) { |
| 378 | ips->is_hv = htonl(ips->is_hv); |
| 379 | ips->is_die = htonl(ips->is_die); |
| 380 | ips->is_pass = htonl(ips->is_pass); |
| 381 | ips->is_flags = htonl(ips->is_flags); |
| 382 | ips->is_opt[0] = htonl(ips->is_opt[0]); |
| 383 | ips->is_opt[1] = htonl(ips->is_opt[1]); |
| 384 | ips->is_optmsk[0] = htonl(ips->is_optmsk[0]); |
| 385 | ips->is_optmsk[1] = htonl(ips->is_optmsk[1]); |
| 386 | ips->is_sec = htons(ips->is_sec); |
| 387 | ips->is_secmsk = htons(ips->is_secmsk); |
| 388 | ips->is_auth = htons(ips->is_auth); |
| 389 | ips->is_authmsk = htons(ips->is_authmsk); |
| 390 | ips->is_s0[0] = htonl(ips->is_s0[0]); |
| 391 | ips->is_s0[1] = htonl(ips->is_s0[1]); |
| 392 | ips->is_smsk[0] = htons(ips->is_smsk[0]); |
| 393 | ips->is_smsk[1] = htons(ips->is_smsk[1]); |
| 394 | } else { |
| 395 | ips->is_hv = ntohl(ips->is_hv); |
| 396 | ips->is_die = ntohl(ips->is_die); |
| 397 | ips->is_pass = ntohl(ips->is_pass); |
| 398 | ips->is_flags = ntohl(ips->is_flags); |
| 399 | ips->is_opt[0] = ntohl(ips->is_opt[0]); |
| 400 | ips->is_opt[1] = ntohl(ips->is_opt[1]); |
| 401 | ips->is_optmsk[0] = ntohl(ips->is_optmsk[0]); |
| 402 | ips->is_optmsk[1] = ntohl(ips->is_optmsk[1]); |
| 403 | ips->is_sec = ntohs(ips->is_sec); |
| 404 | ips->is_secmsk = ntohs(ips->is_secmsk); |
| 405 | ips->is_auth = ntohs(ips->is_auth); |
| 406 | ips->is_authmsk = ntohs(ips->is_authmsk); |
| 407 | ips->is_s0[0] = ntohl(ips->is_s0[0]); |
| 408 | ips->is_s0[1] = ntohl(ips->is_s0[1]); |
| 409 | ips->is_smsk[0] = ntohl(ips->is_smsk[0]); |
| 410 | ips->is_smsk[1] = ntohl(ips->is_smsk[1]); |
| 411 | } |
| 412 | } |
| 413 | # else /* !defined(sparc) && !defined(__hppa) */ |
| 414 | # define ipf_sync_tcporder(x,y) |
| 415 | # define ipf_sync_natorder(x,y) |
| 416 | # define ipf_sync_storder(x,y) |
| 417 | # endif /* !defined(sparc) && !defined(__hppa) */ |
| 418 | |
| 419 | |
| 420 | /* ------------------------------------------------------------------------ */ |
| 421 | /* Function: ipf_sync_write */ |
| 422 | /* Returns: int - 0 == success, else error value. */ |
| 423 | /* Parameters: uio(I) - pointer to information about data to write */ |
| 424 | /* */ |
| 425 | /* Moves data from user space into the kernel and uses it for updating data */ |
| 426 | /* structures in the state/NAT tables. */ |
| 427 | /* ------------------------------------------------------------------------ */ |
| 428 | int |
| 429 | ipf_sync_write(ipf_main_softc_t *softc, struct uio *uio) |
| 430 | { |
| 431 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 432 | synchdr_t sh; |
| 433 | |
| 434 | /* |
| 435 | * THIS MUST BE SUFFICIENT LARGE TO STORE |
| 436 | * ANY POSSIBLE DATA TYPE |
| 437 | */ |
| 438 | char data[2048]; |
| 439 | |
| 440 | int err = 0; |
| 441 | |
| 442 | # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) |
| 443 | uio->uio_rw = UIO_WRITE; |
| 444 | # endif |
| 445 | |
| 446 | /* Try to get bytes */ |
| 447 | while (uio->uio_resid > 0) { |
| 448 | |
| 449 | if (uio->uio_resid >= sizeof(sh)) { |
| 450 | |
| 451 | err = UIOMOVE((void *)&sh, sizeof(sh), UIO_WRITE, uio); |
| 452 | |
| 453 | if (err) { |
| 454 | if (softs->ipf_sync_debug > 2) |
| 455 | printf("uiomove(header) failed: %d\n" , |
| 456 | err); |
| 457 | return err; |
| 458 | } |
| 459 | |
| 460 | /* convert to host order */ |
| 461 | sh.sm_magic = ntohl(sh.sm_magic); |
| 462 | sh.sm_len = ntohl(sh.sm_len); |
| 463 | sh.sm_num = ntohl(sh.sm_num); |
| 464 | |
| 465 | if (softs->ipf_sync_debug > 8) |
| 466 | printf("[%d] Read v:%d p:%d cmd:%d table:%d rev:%d len:%d magic:%x\n" , |
| 467 | sh.sm_num, sh.sm_v, sh.sm_p, sh.sm_cmd, |
| 468 | sh.sm_table, sh.sm_rev, sh.sm_len, |
| 469 | sh.sm_magic); |
| 470 | |
| 471 | if (sh.sm_magic != SYNHDRMAGIC) { |
| 472 | if (softs->ipf_sync_debug > 2) |
| 473 | printf("uiomove(header) invalid %s\n" , |
| 474 | "magic" ); |
| 475 | IPFERROR(110001); |
| 476 | return EINVAL; |
| 477 | } |
| 478 | |
| 479 | if (sh.sm_v != 4 && sh.sm_v != 6) { |
| 480 | if (softs->ipf_sync_debug > 2) |
| 481 | printf("uiomove(header) invalid %s\n" , |
| 482 | "protocol" ); |
| 483 | IPFERROR(110002); |
| 484 | return EINVAL; |
| 485 | } |
| 486 | |
| 487 | if (sh.sm_cmd > SMC_MAXCMD) { |
| 488 | if (softs->ipf_sync_debug > 2) |
| 489 | printf("uiomove(header) invalid %s\n" , |
| 490 | "command" ); |
| 491 | IPFERROR(110003); |
| 492 | return EINVAL; |
| 493 | } |
| 494 | |
| 495 | |
| 496 | if (sh.sm_table > SMC_MAXTBL) { |
| 497 | if (softs->ipf_sync_debug > 2) |
| 498 | printf("uiomove(header) invalid %s\n" , |
| 499 | "table" ); |
| 500 | IPFERROR(110004); |
| 501 | return EINVAL; |
| 502 | } |
| 503 | |
| 504 | } else { |
| 505 | /* unsufficient data, wait until next call */ |
| 506 | if (softs->ipf_sync_debug > 2) |
| 507 | printf("uiomove(header) insufficient data" ); |
| 508 | IPFERROR(110005); |
| 509 | return EAGAIN; |
| 510 | } |
| 511 | |
| 512 | |
| 513 | /* |
| 514 | * We have a header, so try to read the amount of data |
| 515 | * needed for the request |
| 516 | */ |
| 517 | |
| 518 | /* not supported */ |
| 519 | if (sh.sm_len == 0) { |
| 520 | if (softs->ipf_sync_debug > 2) |
| 521 | printf("uiomove(data zero length %s\n" , |
| 522 | "not supported" ); |
| 523 | IPFERROR(110006); |
| 524 | return EINVAL; |
| 525 | } |
| 526 | |
| 527 | if (uio->uio_resid >= sh.sm_len) { |
| 528 | |
| 529 | err = UIOMOVE((void *)data, sh.sm_len, UIO_WRITE, uio); |
| 530 | |
| 531 | if (err) { |
| 532 | if (softs->ipf_sync_debug > 2) |
| 533 | printf("uiomove(data) failed: %d\n" , |
| 534 | err); |
| 535 | return err; |
| 536 | } |
| 537 | |
| 538 | if (softs->ipf_sync_debug > 7) |
| 539 | printf("uiomove(data) %d bytes read\n" , |
| 540 | sh.sm_len); |
| 541 | |
| 542 | if (sh.sm_table == SMC_STATE) |
| 543 | err = ipf_sync_state(softc, &sh, data); |
| 544 | else if (sh.sm_table == SMC_NAT) |
| 545 | err = ipf_sync_nat(softc, &sh, data); |
| 546 | if (softs->ipf_sync_debug > 7) |
| 547 | printf("[%d] Finished with error %d\n" , |
| 548 | sh.sm_num, err); |
| 549 | |
| 550 | } else { |
| 551 | /* insufficient data, wait until next call */ |
| 552 | if (softs->ipf_sync_debug > 2) |
| 553 | printf("uiomove(data) %s %d bytes, got %d\n" , |
| 554 | "insufficient data, need" , |
| 555 | sh.sm_len, (int)uio->uio_resid); |
| 556 | IPFERROR(110007); |
| 557 | return EAGAIN; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | /* no more data */ |
| 562 | return 0; |
| 563 | } |
| 564 | |
| 565 | |
| 566 | /* ------------------------------------------------------------------------ */ |
| 567 | /* Function: ipf_sync_read */ |
| 568 | /* Returns: int - 0 == success, else error value. */ |
| 569 | /* Parameters: uio(O) - pointer to information about where to store data */ |
| 570 | /* */ |
| 571 | /* This function is called when a user program wants to read some data */ |
| 572 | /* for pending state/NAT updates. If no data is available, the caller is */ |
| 573 | /* put to sleep, pending a wakeup from the "lower half" of this code. */ |
| 574 | /* ------------------------------------------------------------------------ */ |
| 575 | int |
| 576 | ipf_sync_read(ipf_main_softc_t *softc, struct uio *uio) |
| 577 | { |
| 578 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 579 | syncupdent_t *su; |
| 580 | synclogent_t *sl; |
| 581 | int err = 0; |
| 582 | |
| 583 | if ((uio->uio_resid & 3) || (uio->uio_resid < 8)) { |
| 584 | IPFERROR(110008); |
| 585 | return EINVAL; |
| 586 | } |
| 587 | |
| 588 | # if BSD_GE_YEAR(199306) || defined(__FreeBSD__) || defined(__osf__) |
| 589 | uio->uio_rw = UIO_READ; |
| 590 | # endif |
| 591 | |
| 592 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 593 | while ((softs->sl_tail == softs->sl_idx) && |
| 594 | (softs->su_tail == softs->su_idx)) { |
| 595 | # if defined(_KERNEL) |
| 596 | # if SOLARIS |
| 597 | if (!cv_wait_sig(&softs->ipslwait, &softs->ipsl_mutex.ipf_lk)) { |
| 598 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 599 | IPFERROR(110009); |
| 600 | return EINTR; |
| 601 | } |
| 602 | # else |
| 603 | # ifdef __hpux |
| 604 | { |
| 605 | lock_t *l; |
| 606 | |
| 607 | l = get_sleep_lock(&softs->sl_tail); |
| 608 | err = sleep(&softs->sl_tail, PZERO+1); |
| 609 | if (err) { |
| 610 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 611 | IPFERROR(110010); |
| 612 | return EINTR; |
| 613 | } |
| 614 | spinunlock(l); |
| 615 | } |
| 616 | # else /* __hpux */ |
| 617 | # ifdef __osf__ |
| 618 | err = mpsleep(&softs->sl_tail, PSUSP|PCATCH, "ipl sleep" , 0, |
| 619 | &softs->ipsl_mutex, MS_LOCK_SIMPLE); |
| 620 | if (err) { |
| 621 | IPFERROR(110011); |
| 622 | return EINTR; |
| 623 | } |
| 624 | # else |
| 625 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 626 | err = SLEEP(&softs->sl_tail, "ipl sleep" ); |
| 627 | if (err) { |
| 628 | IPFERROR(110012); |
| 629 | return EINTR; |
| 630 | } |
| 631 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 632 | # endif /* __osf__ */ |
| 633 | # endif /* __hpux */ |
| 634 | # endif /* SOLARIS */ |
| 635 | # endif /* _KERNEL */ |
| 636 | } |
| 637 | |
| 638 | while ((softs->sl_tail < softs->sl_idx) && |
| 639 | (uio->uio_resid > sizeof(*sl))) { |
| 640 | sl = softs->synclog + softs->sl_tail++; |
| 641 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 642 | err = UIOMOVE(sl, sizeof(*sl), UIO_READ, uio); |
| 643 | if (err != 0) |
| 644 | goto goterror; |
| 645 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 646 | } |
| 647 | |
| 648 | while ((softs->su_tail < softs->su_idx) && |
| 649 | (uio->uio_resid > sizeof(*su))) { |
| 650 | su = softs->syncupd + softs->su_tail; |
| 651 | softs->su_tail++; |
| 652 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 653 | err = UIOMOVE(su, sizeof(*su), UIO_READ, uio); |
| 654 | if (err != 0) |
| 655 | goto goterror; |
| 656 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 657 | if (su->sup_hdr.sm_sl != NULL) |
| 658 | su->sup_hdr.sm_sl->sl_idx = -1; |
| 659 | } |
| 660 | if (softs->sl_tail == softs->sl_idx) |
| 661 | softs->sl_tail = softs->sl_idx = 0; |
| 662 | if (softs->su_tail == softs->su_idx) |
| 663 | softs->su_tail = softs->su_idx = 0; |
| 664 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 665 | goterror: |
| 666 | return err; |
| 667 | } |
| 668 | |
| 669 | |
| 670 | /* ------------------------------------------------------------------------ */ |
| 671 | /* Function: ipf_sync_state */ |
| 672 | /* Returns: int - 0 == success, else error value. */ |
| 673 | /* Parameters: sp(I) - pointer to sync packet data header */ |
| 674 | /* uio(I) - pointer to user data for further information */ |
| 675 | /* */ |
| 676 | /* Updates the state table according to information passed in the sync */ |
| 677 | /* header. As required, more data is fetched from the uio structure but */ |
| 678 | /* varies depending on the contents of the sync header. This function can */ |
| 679 | /* create a new state entry or update one. Deletion is left to the state */ |
| 680 | /* structures being timed out correctly. */ |
| 681 | /* ------------------------------------------------------------------------ */ |
| 682 | static int |
| 683 | ipf_sync_state(ipf_main_softc_t *softc, synchdr_t *sp, void *data) |
| 684 | { |
| 685 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 686 | synctcp_update_t su; |
| 687 | ipstate_t *is, sn; |
| 688 | synclist_t *sl; |
| 689 | frentry_t *fr; |
| 690 | u_int hv; |
| 691 | int err = 0; |
| 692 | |
| 693 | hv = sp->sm_num & (softs->ipf_sync_state_tab_sz - 1); |
| 694 | |
| 695 | switch (sp->sm_cmd) |
| 696 | { |
| 697 | case SMC_CREATE : |
| 698 | |
| 699 | bcopy(data, &sn, sizeof(sn)); |
| 700 | KMALLOC(is, ipstate_t *); |
| 701 | if (is == NULL) { |
| 702 | IPFERROR(110013); |
| 703 | err = ENOMEM; |
| 704 | break; |
| 705 | } |
| 706 | |
| 707 | KMALLOC(sl, synclist_t *); |
| 708 | if (sl == NULL) { |
| 709 | IPFERROR(110014); |
| 710 | err = ENOMEM; |
| 711 | KFREE(is); |
| 712 | break; |
| 713 | } |
| 714 | |
| 715 | bzero((char *)is, offsetof(ipstate_t, is_die)); |
| 716 | bcopy((char *)&sn.is_die, (char *)&is->is_die, |
| 717 | sizeof(*is) - offsetof(ipstate_t, is_die)); |
| 718 | ipf_sync_storder(0, is); |
| 719 | |
| 720 | /* |
| 721 | * We need to find the same rule on the slave as was used on |
| 722 | * the master to create this state entry. |
| 723 | */ |
| 724 | READ_ENTER(&softc->ipf_mutex); |
| 725 | fr = ipf_getrulen(softc, IPL_LOGIPF, sn.is_group, sn.is_rulen); |
| 726 | if (fr != NULL) { |
| 727 | MUTEX_ENTER(&fr->fr_lock); |
| 728 | fr->fr_ref++; |
| 729 | fr->fr_statecnt++; |
| 730 | MUTEX_EXIT(&fr->fr_lock); |
| 731 | } |
| 732 | RWLOCK_EXIT(&softc->ipf_mutex); |
| 733 | |
| 734 | if (softs->ipf_sync_debug > 4) |
| 735 | printf("[%d] Filter rules = %p\n" , sp->sm_num, fr); |
| 736 | |
| 737 | is->is_rule = fr; |
| 738 | is->is_sync = sl; |
| 739 | |
| 740 | sl->sl_idx = -1; |
| 741 | sl->sl_ips = is; |
| 742 | bcopy(sp, &sl->sl_hdr, sizeof(struct synchdr)); |
| 743 | |
| 744 | WRITE_ENTER(&softs->ipf_syncstate); |
| 745 | WRITE_ENTER(&softc->ipf_state); |
| 746 | |
| 747 | sl->sl_pnext = softs->syncstatetab + hv; |
| 748 | sl->sl_next = softs->syncstatetab[hv]; |
| 749 | if (softs->syncstatetab[hv] != NULL) |
| 750 | softs->syncstatetab[hv]->sl_pnext = &sl->sl_next; |
| 751 | softs->syncstatetab[hv] = sl; |
| 752 | MUTEX_DOWNGRADE(&softs->ipf_syncstate); |
| 753 | ipf_state_insert(softc, is, sp->sm_rev); |
| 754 | /* |
| 755 | * Do not initialise the interface pointers for the state |
| 756 | * entry as the full complement of interface names may not |
| 757 | * be present. |
| 758 | * |
| 759 | * Put this state entry on its timeout queue. |
| 760 | */ |
| 761 | /*fr_setstatequeue(is, sp->sm_rev);*/ |
| 762 | break; |
| 763 | |
| 764 | case SMC_UPDATE : |
| 765 | bcopy(data, &su, sizeof(su)); |
| 766 | |
| 767 | if (softs->ipf_sync_debug > 4) |
| 768 | printf("[%d] Update age %lu state %d/%d \n" , |
| 769 | sp->sm_num, su.stu_age, su.stu_state[0], |
| 770 | su.stu_state[1]); |
| 771 | |
| 772 | READ_ENTER(&softs->ipf_syncstate); |
| 773 | for (sl = softs->syncstatetab[hv]; (sl != NULL); |
| 774 | sl = sl->sl_next) |
| 775 | if (sl->sl_hdr.sm_num == sp->sm_num) |
| 776 | break; |
| 777 | if (sl == NULL) { |
| 778 | if (softs->ipf_sync_debug > 1) |
| 779 | printf("[%d] State not found - can't update\n" , |
| 780 | sp->sm_num); |
| 781 | RWLOCK_EXIT(&softs->ipf_syncstate); |
| 782 | IPFERROR(110015); |
| 783 | err = ENOENT; |
| 784 | break; |
| 785 | } |
| 786 | |
| 787 | READ_ENTER(&softc->ipf_state); |
| 788 | |
| 789 | if (softs->ipf_sync_debug > 6) |
| 790 | printf("[%d] Data from state v:%d p:%d cmd:%d table:%d rev:%d\n" , |
| 791 | sp->sm_num, sl->sl_hdr.sm_v, sl->sl_hdr.sm_p, |
| 792 | sl->sl_hdr.sm_cmd, sl->sl_hdr.sm_table, |
| 793 | sl->sl_hdr.sm_rev); |
| 794 | |
| 795 | is = sl->sl_ips; |
| 796 | |
| 797 | MUTEX_ENTER(&is->is_lock); |
| 798 | switch (sp->sm_p) |
| 799 | { |
| 800 | case IPPROTO_TCP : |
| 801 | /* XXX FV --- shouldn't we do ntohl/htonl???? XXX */ |
| 802 | is->is_send = su.stu_data[0].td_end; |
| 803 | is->is_maxsend = su.stu_data[0].td_maxend; |
| 804 | is->is_maxswin = su.stu_data[0].td_maxwin; |
| 805 | is->is_state[0] = su.stu_state[0]; |
| 806 | is->is_dend = su.stu_data[1].td_end; |
| 807 | is->is_maxdend = su.stu_data[1].td_maxend; |
| 808 | is->is_maxdwin = su.stu_data[1].td_maxwin; |
| 809 | is->is_state[1] = su.stu_state[1]; |
| 810 | break; |
| 811 | default : |
| 812 | break; |
| 813 | } |
| 814 | |
| 815 | if (softs->ipf_sync_debug > 6) |
| 816 | printf("[%d] Setting timers for state\n" , sp->sm_num); |
| 817 | |
| 818 | ipf_state_setqueue(softc, is, sp->sm_rev); |
| 819 | |
| 820 | MUTEX_EXIT(&is->is_lock); |
| 821 | break; |
| 822 | |
| 823 | default : |
| 824 | IPFERROR(110016); |
| 825 | err = EINVAL; |
| 826 | break; |
| 827 | } |
| 828 | |
| 829 | if (err == 0) { |
| 830 | RWLOCK_EXIT(&softc->ipf_state); |
| 831 | RWLOCK_EXIT(&softs->ipf_syncstate); |
| 832 | } |
| 833 | |
| 834 | if (softs->ipf_sync_debug > 6) |
| 835 | printf("[%d] Update completed with error %d\n" , |
| 836 | sp->sm_num, err); |
| 837 | |
| 838 | return err; |
| 839 | } |
| 840 | |
| 841 | |
| 842 | /* ------------------------------------------------------------------------ */ |
| 843 | /* Function: ipf_sync_del */ |
| 844 | /* Returns: Nil */ |
| 845 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
| 846 | /* */ |
| 847 | /* Deletes an object from the synclist. */ |
| 848 | /* ------------------------------------------------------------------------ */ |
| 849 | static void |
| 850 | ipf_sync_del(ipf_sync_softc_t *softs, synclist_t *sl) |
| 851 | { |
| 852 | *sl->sl_pnext = sl->sl_next; |
| 853 | if (sl->sl_next != NULL) |
| 854 | sl->sl_next->sl_pnext = sl->sl_pnext; |
| 855 | if (sl->sl_idx != -1) |
| 856 | softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; |
| 857 | } |
| 858 | |
| 859 | |
| 860 | /* ------------------------------------------------------------------------ */ |
| 861 | /* Function: ipf_sync_del_state */ |
| 862 | /* Returns: Nil */ |
| 863 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
| 864 | /* */ |
| 865 | /* Deletes an object from the synclist state table and free's its memory. */ |
| 866 | /* ------------------------------------------------------------------------ */ |
| 867 | void |
| 868 | ipf_sync_del_state(void *arg, synclist_t *sl) |
| 869 | { |
| 870 | ipf_sync_softc_t *softs = arg; |
| 871 | |
| 872 | WRITE_ENTER(&softs->ipf_syncstate); |
| 873 | ipf_sync_del(softs, sl); |
| 874 | RWLOCK_EXIT(&softs->ipf_syncstate); |
| 875 | KFREE(sl); |
| 876 | } |
| 877 | |
| 878 | |
| 879 | /* ------------------------------------------------------------------------ */ |
| 880 | /* Function: ipf_sync_del_nat */ |
| 881 | /* Returns: Nil */ |
| 882 | /* Parameters: sl(I) - pointer to synclist object to delete */ |
| 883 | /* */ |
| 884 | /* Deletes an object from the synclist nat table and free's its memory. */ |
| 885 | /* ------------------------------------------------------------------------ */ |
| 886 | void |
| 887 | ipf_sync_del_nat(void *arg, synclist_t *sl) |
| 888 | { |
| 889 | ipf_sync_softc_t *softs = arg; |
| 890 | |
| 891 | WRITE_ENTER(&softs->ipf_syncnat); |
| 892 | ipf_sync_del(softs, sl); |
| 893 | RWLOCK_EXIT(&softs->ipf_syncnat); |
| 894 | KFREE(sl); |
| 895 | } |
| 896 | |
| 897 | |
| 898 | /* ------------------------------------------------------------------------ */ |
| 899 | /* Function: ipf_sync_nat */ |
| 900 | /* Returns: int - 0 == success, else error value. */ |
| 901 | /* Parameters: sp(I) - pointer to sync packet data header */ |
| 902 | /* uio(I) - pointer to user data for further information */ |
| 903 | /* */ |
| 904 | /* Updates the NAT table according to information passed in the sync */ |
| 905 | /* header. As required, more data is fetched from the uio structure but */ |
| 906 | /* varies depending on the contents of the sync header. This function can */ |
| 907 | /* create a new NAT entry or update one. Deletion is left to the NAT */ |
| 908 | /* structures being timed out correctly. */ |
| 909 | /* ------------------------------------------------------------------------ */ |
| 910 | static int |
| 911 | ipf_sync_nat(ipf_main_softc_t *softc, synchdr_t *sp, void *data) |
| 912 | { |
| 913 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 914 | syncupdent_t su; |
| 915 | nat_t *n, *nat; |
| 916 | synclist_t *sl; |
| 917 | u_int hv = 0; |
| 918 | int err = 0; |
| 919 | |
| 920 | READ_ENTER(&softs->ipf_syncnat); |
| 921 | |
| 922 | switch (sp->sm_cmd) |
| 923 | { |
| 924 | case SMC_CREATE : |
| 925 | KMALLOC(n, nat_t *); |
| 926 | if (n == NULL) { |
| 927 | IPFERROR(110017); |
| 928 | err = ENOMEM; |
| 929 | break; |
| 930 | } |
| 931 | |
| 932 | KMALLOC(sl, synclist_t *); |
| 933 | if (sl == NULL) { |
| 934 | IPFERROR(110018); |
| 935 | err = ENOMEM; |
| 936 | KFREE(n); |
| 937 | break; |
| 938 | } |
| 939 | |
| 940 | nat = (nat_t *)data; |
| 941 | bzero((char *)n, offsetof(nat_t, nat_age)); |
| 942 | bcopy((char *)&nat->nat_age, (char *)&n->nat_age, |
| 943 | sizeof(*n) - offsetof(nat_t, nat_age)); |
| 944 | ipf_sync_natorder(0, n); |
| 945 | n->nat_sync = sl; |
| 946 | n->nat_rev = sl->sl_rev; |
| 947 | |
| 948 | sl->sl_idx = -1; |
| 949 | sl->sl_ipn = n; |
| 950 | sl->sl_num = ntohl(sp->sm_num); |
| 951 | |
| 952 | WRITE_ENTER(&softc->ipf_nat); |
| 953 | sl->sl_pnext = softs->syncnattab + hv; |
| 954 | sl->sl_next = softs->syncnattab[hv]; |
| 955 | if (softs->syncnattab[hv] != NULL) |
| 956 | softs->syncnattab[hv]->sl_pnext = &sl->sl_next; |
| 957 | softs->syncnattab[hv] = sl; |
| 958 | (void) ipf_nat_insert(softc, softc->ipf_nat_soft, n); |
| 959 | RWLOCK_EXIT(&softc->ipf_nat); |
| 960 | break; |
| 961 | |
| 962 | case SMC_UPDATE : |
| 963 | bcopy(data, &su, sizeof(su)); |
| 964 | |
| 965 | for (sl = softs->syncnattab[hv]; (sl != NULL); |
| 966 | sl = sl->sl_next) |
| 967 | if (sl->sl_hdr.sm_num == sp->sm_num) |
| 968 | break; |
| 969 | if (sl == NULL) { |
| 970 | IPFERROR(110019); |
| 971 | err = ENOENT; |
| 972 | break; |
| 973 | } |
| 974 | |
| 975 | READ_ENTER(&softc->ipf_nat); |
| 976 | |
| 977 | nat = sl->sl_ipn; |
| 978 | nat->nat_rev = sl->sl_rev; |
| 979 | |
| 980 | MUTEX_ENTER(&nat->nat_lock); |
| 981 | ipf_nat_setqueue(softc, softc->ipf_nat_soft, nat); |
| 982 | MUTEX_EXIT(&nat->nat_lock); |
| 983 | |
| 984 | RWLOCK_EXIT(&softc->ipf_nat); |
| 985 | |
| 986 | break; |
| 987 | |
| 988 | default : |
| 989 | IPFERROR(110020); |
| 990 | err = EINVAL; |
| 991 | break; |
| 992 | } |
| 993 | |
| 994 | RWLOCK_EXIT(&softs->ipf_syncnat); |
| 995 | return err; |
| 996 | } |
| 997 | |
| 998 | |
| 999 | /* ------------------------------------------------------------------------ */ |
| 1000 | /* Function: ipf_sync_new */ |
| 1001 | /* Returns: synclist_t* - NULL == failure, else pointer to new synclist */ |
| 1002 | /* data structure. */ |
| 1003 | /* Parameters: tab(I) - type of synclist_t to create */ |
| 1004 | /* fin(I) - pointer to packet information */ |
| 1005 | /* ptr(I) - pointer to owning object */ |
| 1006 | /* */ |
| 1007 | /* Creates a new sync table entry and notifies any sleepers that it's there */ |
| 1008 | /* waiting to be processed. */ |
| 1009 | /* ------------------------------------------------------------------------ */ |
| 1010 | synclist_t * |
| 1011 | ipf_sync_new(ipf_main_softc_t *softc, int tab, fr_info_t *fin, void *ptr) |
| 1012 | { |
| 1013 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1014 | synclist_t *sl, *ss; |
| 1015 | synclogent_t *sle; |
| 1016 | u_int hv, sz; |
| 1017 | |
| 1018 | if (softs->sl_idx == softs->ipf_sync_log_sz) |
| 1019 | return NULL; |
| 1020 | KMALLOC(sl, synclist_t *); |
| 1021 | if (sl == NULL) |
| 1022 | return NULL; |
| 1023 | |
| 1024 | MUTEX_ENTER(&softs->ipf_syncadd); |
| 1025 | /* |
| 1026 | * Get a unique number for this synclist_t. The number is only meant |
| 1027 | * to be unique for the lifetime of the structure and may be reused |
| 1028 | * later. |
| 1029 | */ |
| 1030 | softs->ipf_sync_num++; |
| 1031 | if (softs->ipf_sync_num == 0) { |
| 1032 | softs->ipf_sync_num = 1; |
| 1033 | softs->ipf_sync_wrap++; |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Use the synch number of the object as the hash key. Should end up |
| 1038 | * with relatively even distribution over time. |
| 1039 | * XXX - an attacker could lunch an DoS attack, of sorts, if they are |
| 1040 | * the only one causing new table entries by only keeping open every |
| 1041 | * nth connection they make, where n is a value in the interval |
| 1042 | * [0, SYNC_STATETABSZ-1]. |
| 1043 | */ |
| 1044 | switch (tab) |
| 1045 | { |
| 1046 | case SMC_STATE : |
| 1047 | hv = softs->ipf_sync_num & (softs->ipf_sync_state_tab_sz - 1); |
| 1048 | while (softs->ipf_sync_wrap != 0) { |
| 1049 | for (ss = softs->syncstatetab[hv]; ss; ss = ss->sl_next) |
| 1050 | if (ss->sl_hdr.sm_num == softs->ipf_sync_num) |
| 1051 | break; |
| 1052 | if (ss == NULL) |
| 1053 | break; |
| 1054 | softs->ipf_sync_num++; |
| 1055 | hv = softs->ipf_sync_num & |
| 1056 | (softs->ipf_sync_state_tab_sz - 1); |
| 1057 | } |
| 1058 | sl->sl_pnext = softs->syncstatetab + hv; |
| 1059 | sl->sl_next = softs->syncstatetab[hv]; |
| 1060 | softs->syncstatetab[hv] = sl; |
| 1061 | break; |
| 1062 | |
| 1063 | case SMC_NAT : |
| 1064 | hv = softs->ipf_sync_num & (softs->ipf_sync_nat_tab_sz - 1); |
| 1065 | while (softs->ipf_sync_wrap != 0) { |
| 1066 | for (ss = softs->syncnattab[hv]; ss; ss = ss->sl_next) |
| 1067 | if (ss->sl_hdr.sm_num == softs->ipf_sync_num) |
| 1068 | break; |
| 1069 | if (ss == NULL) |
| 1070 | break; |
| 1071 | softs->ipf_sync_num++; |
| 1072 | hv = softs->ipf_sync_num & |
| 1073 | (softs->ipf_sync_nat_tab_sz - 1); |
| 1074 | } |
| 1075 | sl->sl_pnext = softs->syncnattab + hv; |
| 1076 | sl->sl_next = softs->syncnattab[hv]; |
| 1077 | softs->syncnattab[hv] = sl; |
| 1078 | break; |
| 1079 | |
| 1080 | default : |
| 1081 | break; |
| 1082 | } |
| 1083 | |
| 1084 | sl->sl_num = softs->ipf_sync_num; |
| 1085 | MUTEX_EXIT(&softs->ipf_syncadd); |
| 1086 | |
| 1087 | sl->sl_magic = htonl(SYNHDRMAGIC); |
| 1088 | sl->sl_v = fin->fin_v; |
| 1089 | sl->sl_p = fin->fin_p; |
| 1090 | sl->sl_cmd = SMC_CREATE; |
| 1091 | sl->sl_idx = -1; |
| 1092 | sl->sl_table = tab; |
| 1093 | sl->sl_rev = fin->fin_rev; |
| 1094 | if (tab == SMC_STATE) { |
| 1095 | sl->sl_ips = ptr; |
| 1096 | sz = sizeof(*sl->sl_ips); |
| 1097 | } else if (tab == SMC_NAT) { |
| 1098 | sl->sl_ipn = ptr; |
| 1099 | sz = sizeof(*sl->sl_ipn); |
| 1100 | } else { |
| 1101 | ptr = NULL; |
| 1102 | sz = 0; |
| 1103 | } |
| 1104 | sl->sl_len = sz; |
| 1105 | |
| 1106 | /* |
| 1107 | * Create the log entry to be read by a user daemon. When it has been |
| 1108 | * finished and put on the queue, send a signal to wakeup any waiters. |
| 1109 | */ |
| 1110 | MUTEX_ENTER(&softs->ipf_syncadd); |
| 1111 | sle = softs->synclog + softs->sl_idx++; |
| 1112 | bcopy((char *)&sl->sl_hdr, (char *)&sle->sle_hdr, |
| 1113 | sizeof(sle->sle_hdr)); |
| 1114 | sle->sle_hdr.sm_num = htonl(sle->sle_hdr.sm_num); |
| 1115 | sle->sle_hdr.sm_len = htonl(sle->sle_hdr.sm_len); |
| 1116 | if (ptr != NULL) { |
| 1117 | bcopy((char *)ptr, (char *)&sle->sle_un, sz); |
| 1118 | if (tab == SMC_STATE) { |
| 1119 | ipf_sync_storder(1, &sle->sle_un.sleu_ips); |
| 1120 | } else if (tab == SMC_NAT) { |
| 1121 | ipf_sync_natorder(1, &sle->sle_un.sleu_ipn); |
| 1122 | } |
| 1123 | } |
| 1124 | MUTEX_EXIT(&softs->ipf_syncadd); |
| 1125 | |
| 1126 | ipf_sync_wakeup(softc); |
| 1127 | return sl; |
| 1128 | } |
| 1129 | |
| 1130 | |
| 1131 | /* ------------------------------------------------------------------------ */ |
| 1132 | /* Function: ipf_sync_update */ |
| 1133 | /* Returns: Nil */ |
| 1134 | /* Parameters: tab(I) - type of synclist_t to create */ |
| 1135 | /* fin(I) - pointer to packet information */ |
| 1136 | /* sl(I) - pointer to synchronisation object */ |
| 1137 | /* */ |
| 1138 | /* For outbound packets, only, create an sync update record for the user */ |
| 1139 | /* process to read. */ |
| 1140 | /* ------------------------------------------------------------------------ */ |
| 1141 | void |
| 1142 | ipf_sync_update(ipf_main_softc_t *softc, int tab, fr_info_t *fin, |
| 1143 | synclist_t *sl) |
| 1144 | { |
| 1145 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1146 | synctcp_update_t *st; |
| 1147 | syncupdent_t *slu; |
| 1148 | ipstate_t *ips; |
| 1149 | nat_t *nat; |
| 1150 | ipfrwlock_t *lock; |
| 1151 | |
| 1152 | if (fin->fin_out == 0 || sl == NULL) |
| 1153 | return; |
| 1154 | |
| 1155 | if (tab == SMC_STATE) { |
| 1156 | lock = &softs->ipf_syncstate; |
| 1157 | } else { |
| 1158 | lock = &softs->ipf_syncnat; |
| 1159 | } |
| 1160 | |
| 1161 | READ_ENTER(lock); |
| 1162 | if (sl->sl_idx == -1) { |
| 1163 | MUTEX_ENTER(&softs->ipf_syncadd); |
| 1164 | slu = softs->syncupd + softs->su_idx; |
| 1165 | sl->sl_idx = softs->su_idx++; |
| 1166 | MUTEX_EXIT(&softs->ipf_syncadd); |
| 1167 | |
| 1168 | bcopy((char *)&sl->sl_hdr, (char *)&slu->sup_hdr, |
| 1169 | sizeof(slu->sup_hdr)); |
| 1170 | slu->sup_hdr.sm_magic = htonl(SYNHDRMAGIC); |
| 1171 | slu->sup_hdr.sm_sl = sl; |
| 1172 | slu->sup_hdr.sm_cmd = SMC_UPDATE; |
| 1173 | slu->sup_hdr.sm_table = tab; |
| 1174 | slu->sup_hdr.sm_num = htonl(sl->sl_num); |
| 1175 | slu->sup_hdr.sm_len = htonl(sizeof(struct synctcp_update)); |
| 1176 | slu->sup_hdr.sm_rev = fin->fin_rev; |
| 1177 | # if 0 |
| 1178 | if (fin->fin_p == IPPROTO_TCP) { |
| 1179 | st->stu_len[0] = 0; |
| 1180 | st->stu_len[1] = 0; |
| 1181 | } |
| 1182 | # endif |
| 1183 | } else |
| 1184 | slu = softs->syncupd + sl->sl_idx; |
| 1185 | |
| 1186 | /* |
| 1187 | * Only TCP has complex timeouts, others just use default timeouts. |
| 1188 | * For TCP, we only need to track the connection state and window. |
| 1189 | */ |
| 1190 | if (fin->fin_p == IPPROTO_TCP) { |
| 1191 | st = &slu->sup_tcp; |
| 1192 | if (tab == SMC_STATE) { |
| 1193 | ips = sl->sl_ips; |
| 1194 | st->stu_age = htonl(ips->is_die); |
| 1195 | st->stu_data[0].td_end = ips->is_send; |
| 1196 | st->stu_data[0].td_maxend = ips->is_maxsend; |
| 1197 | st->stu_data[0].td_maxwin = ips->is_maxswin; |
| 1198 | st->stu_state[0] = ips->is_state[0]; |
| 1199 | st->stu_data[1].td_end = ips->is_dend; |
| 1200 | st->stu_data[1].td_maxend = ips->is_maxdend; |
| 1201 | st->stu_data[1].td_maxwin = ips->is_maxdwin; |
| 1202 | st->stu_state[1] = ips->is_state[1]; |
| 1203 | } else if (tab == SMC_NAT) { |
| 1204 | nat = sl->sl_ipn; |
| 1205 | st->stu_age = htonl(nat->nat_age); |
| 1206 | } |
| 1207 | } |
| 1208 | RWLOCK_EXIT(lock); |
| 1209 | |
| 1210 | ipf_sync_wakeup(softc); |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | /* ------------------------------------------------------------------------ */ |
| 1215 | /* Function: ipf_sync_flush_table */ |
| 1216 | /* Returns: int - number of entries freed by flushing table */ |
| 1217 | /* Parameters: tabsize(I) - size of the array pointed to by table */ |
| 1218 | /* table(I) - pointer to sync table to empty */ |
| 1219 | /* */ |
| 1220 | /* Walk through a table of sync entries and free each one. It is assumed */ |
| 1221 | /* that some lock is held so that nobody else tries to access the table */ |
| 1222 | /* during this cleanup. */ |
| 1223 | /* ------------------------------------------------------------------------ */ |
| 1224 | static int |
| 1225 | ipf_sync_flush_table(ipf_sync_softc_t *softs, int tabsize, synclist_t **table) |
| 1226 | { |
| 1227 | synclist_t *sl; |
| 1228 | int i, items; |
| 1229 | |
| 1230 | items = 0; |
| 1231 | |
| 1232 | for (i = 0; i < tabsize; i++) { |
| 1233 | while ((sl = table[i]) != NULL) { |
| 1234 | switch (sl->sl_table) { |
| 1235 | case SMC_STATE : |
| 1236 | if (sl->sl_ips != NULL) |
| 1237 | sl->sl_ips->is_sync = NULL; |
| 1238 | break; |
| 1239 | case SMC_NAT : |
| 1240 | if (sl->sl_ipn != NULL) |
| 1241 | sl->sl_ipn->nat_sync = NULL; |
| 1242 | break; |
| 1243 | } |
| 1244 | if (sl->sl_next != NULL) |
| 1245 | sl->sl_next->sl_pnext = sl->sl_pnext; |
| 1246 | table[i] = sl->sl_next; |
| 1247 | if (sl->sl_idx != -1) |
| 1248 | softs->syncupd[sl->sl_idx].sup_hdr.sm_sl = NULL; |
| 1249 | KFREE(sl); |
| 1250 | items++; |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | return items; |
| 1255 | } |
| 1256 | |
| 1257 | |
| 1258 | /* ------------------------------------------------------------------------ */ |
| 1259 | /* Function: ipf_sync_ioctl */ |
| 1260 | /* Returns: int - 0 == success, != 0 == failure */ |
| 1261 | /* Parameters: data(I) - pointer to ioctl data */ |
| 1262 | /* cmd(I) - ioctl command integer */ |
| 1263 | /* mode(I) - file mode bits used with open */ |
| 1264 | /* */ |
| 1265 | /* This function currently does not handle any ioctls and so just returns */ |
| 1266 | /* EINVAL on all occasions. */ |
| 1267 | /* ------------------------------------------------------------------------ */ |
| 1268 | int |
| 1269 | ipf_sync_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, |
| 1270 | int uid, void *ctx) |
| 1271 | { |
| 1272 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1273 | int error, i; |
| 1274 | SPL_INT(s); |
| 1275 | |
| 1276 | switch (cmd) |
| 1277 | { |
| 1278 | case SIOCIPFFL: |
| 1279 | error = BCOPYIN(data, &i, sizeof(i)); |
| 1280 | if (error != 0) { |
| 1281 | IPFERROR(110023); |
| 1282 | error = EFAULT; |
| 1283 | break; |
| 1284 | } |
| 1285 | |
| 1286 | switch (i) |
| 1287 | { |
| 1288 | case SMC_RLOG : |
| 1289 | SPL_NET(s); |
| 1290 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 1291 | i = (softs->sl_tail - softs->sl_idx) + |
| 1292 | (softs->su_tail - softs->su_idx); |
| 1293 | softs->sl_idx = 0; |
| 1294 | softs->su_idx = 0; |
| 1295 | softs->sl_tail = 0; |
| 1296 | softs->su_tail = 0; |
| 1297 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 1298 | SPL_X(s); |
| 1299 | break; |
| 1300 | |
| 1301 | case SMC_NAT : |
| 1302 | SPL_NET(s); |
| 1303 | WRITE_ENTER(&softs->ipf_syncnat); |
| 1304 | i = ipf_sync_flush_table(softs, SYNC_NATTABSZ, |
| 1305 | softs->syncnattab); |
| 1306 | RWLOCK_EXIT(&softs->ipf_syncnat); |
| 1307 | SPL_X(s); |
| 1308 | break; |
| 1309 | |
| 1310 | case SMC_STATE : |
| 1311 | SPL_NET(s); |
| 1312 | WRITE_ENTER(&softs->ipf_syncstate); |
| 1313 | i = ipf_sync_flush_table(softs, SYNC_STATETABSZ, |
| 1314 | softs->syncstatetab); |
| 1315 | RWLOCK_EXIT(&softs->ipf_syncstate); |
| 1316 | SPL_X(s); |
| 1317 | break; |
| 1318 | } |
| 1319 | |
| 1320 | error = BCOPYOUT(&i, data, sizeof(i)); |
| 1321 | if (error != 0) { |
| 1322 | IPFERROR(110022); |
| 1323 | error = EFAULT; |
| 1324 | } |
| 1325 | break; |
| 1326 | |
| 1327 | default : |
| 1328 | IPFERROR(110021); |
| 1329 | error = EINVAL; |
| 1330 | break; |
| 1331 | } |
| 1332 | |
| 1333 | return error; |
| 1334 | } |
| 1335 | |
| 1336 | |
| 1337 | /* ------------------------------------------------------------------------ */ |
| 1338 | /* Function: ipf_sync_canread */ |
| 1339 | /* Returns: int - 0 == success, != 0 == failure */ |
| 1340 | /* Parameters: Nil */ |
| 1341 | /* */ |
| 1342 | /* This function provides input to the poll handler about whether or not */ |
| 1343 | /* there is data waiting to be read from the /dev/ipsync device. */ |
| 1344 | /* ------------------------------------------------------------------------ */ |
| 1345 | int |
| 1346 | ipf_sync_canread(void *arg) |
| 1347 | { |
| 1348 | ipf_sync_softc_t *softs = arg; |
| 1349 | return !((softs->sl_tail == softs->sl_idx) && |
| 1350 | (softs->su_tail == softs->su_idx)); |
| 1351 | } |
| 1352 | |
| 1353 | |
| 1354 | /* ------------------------------------------------------------------------ */ |
| 1355 | /* Function: ipf_sync_canwrite */ |
| 1356 | /* Returns: int - 1 == can always write */ |
| 1357 | /* Parameters: Nil */ |
| 1358 | /* */ |
| 1359 | /* This function lets the poll handler know that it is always ready willing */ |
| 1360 | /* to accept write events. */ |
| 1361 | /* XXX Maybe this should return false if the sync table is full? */ |
| 1362 | /* ------------------------------------------------------------------------ */ |
| 1363 | int |
| 1364 | ipf_sync_canwrite(void *arg) |
| 1365 | { |
| 1366 | return 1; |
| 1367 | } |
| 1368 | |
| 1369 | |
| 1370 | /* ------------------------------------------------------------------------ */ |
| 1371 | /* Function: ipf_sync_wakeup */ |
| 1372 | /* Parameters: Nil */ |
| 1373 | /* Returns: Nil */ |
| 1374 | /* */ |
| 1375 | /* This function implements the heuristics that decide how often to */ |
| 1376 | /* generate a poll wakeup for programs that are waiting for information */ |
| 1377 | /* about when they can do a read on /dev/ipsync. */ |
| 1378 | /* */ |
| 1379 | /* There are three different considerations here: */ |
| 1380 | /* - do not keep a program waiting too long: ipf_sync_wake_interval is the */ |
| 1381 | /* maximum number of ipf ticks to let pass by; */ |
| 1382 | /* - do not let the queue of ouststanding things to generate notifies for */ |
| 1383 | /* get too full (ipf_sync_queue_high_wm is the high water mark); */ |
| 1384 | /* - do not let too many events get collapsed in before deciding that the */ |
| 1385 | /* other host(s) need an update (ipf_sync_event_high_wm is the high water */ |
| 1386 | /* mark for this counter.) */ |
| 1387 | /* ------------------------------------------------------------------------ */ |
| 1388 | static void |
| 1389 | ipf_sync_wakeup(ipf_main_softc_t *softc) |
| 1390 | { |
| 1391 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1392 | |
| 1393 | softs->ipf_sync_events++; |
| 1394 | if ((softc->ipf_ticks > |
| 1395 | softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval) || |
| 1396 | (softs->ipf_sync_events > softs->ipf_sync_event_high_wm) || |
| 1397 | ((softs->sl_tail - softs->sl_idx) > |
| 1398 | softs->ipf_sync_queue_high_wm) || |
| 1399 | ((softs->su_tail - softs->su_idx) > |
| 1400 | softs->ipf_sync_queue_high_wm)) { |
| 1401 | |
| 1402 | ipf_sync_poll_wakeup(softc); |
| 1403 | } |
| 1404 | } |
| 1405 | |
| 1406 | |
| 1407 | /* ------------------------------------------------------------------------ */ |
| 1408 | /* Function: ipf_sync_poll_wakeup */ |
| 1409 | /* Parameters: Nil */ |
| 1410 | /* Returns: Nil */ |
| 1411 | /* */ |
| 1412 | /* Deliver a poll wakeup and reset counters for two of the three heuristics */ |
| 1413 | /* ------------------------------------------------------------------------ */ |
| 1414 | static void |
| 1415 | ipf_sync_poll_wakeup(ipf_main_softc_t *softc) |
| 1416 | { |
| 1417 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1418 | |
| 1419 | softs->ipf_sync_events = 0; |
| 1420 | softs->ipf_sync_lastwakeup = softc->ipf_ticks; |
| 1421 | |
| 1422 | # ifdef _KERNEL |
| 1423 | # if SOLARIS |
| 1424 | MUTEX_ENTER(&softs->ipsl_mutex); |
| 1425 | cv_signal(&softs->ipslwait); |
| 1426 | MUTEX_EXIT(&softs->ipsl_mutex); |
| 1427 | pollwakeup(&softc->ipf_poll_head[IPL_LOGSYNC], POLLIN|POLLRDNORM); |
| 1428 | # else |
| 1429 | WAKEUP(&softs->sl_tail, 0); |
| 1430 | POLLWAKEUP(IPL_LOGSYNC); |
| 1431 | # endif |
| 1432 | # endif |
| 1433 | } |
| 1434 | |
| 1435 | |
| 1436 | /* ------------------------------------------------------------------------ */ |
| 1437 | /* Function: ipf_sync_expire */ |
| 1438 | /* Parameters: Nil */ |
| 1439 | /* Returns: Nil */ |
| 1440 | /* */ |
| 1441 | /* This is the function called even ipf_tick. It implements one of the */ |
| 1442 | /* three heuristics above *IF* there are events waiting. */ |
| 1443 | /* ------------------------------------------------------------------------ */ |
| 1444 | void |
| 1445 | ipf_sync_expire(ipf_main_softc_t *softc) |
| 1446 | { |
| 1447 | ipf_sync_softc_t *softs = softc->ipf_sync_soft; |
| 1448 | |
| 1449 | if ((softs->ipf_sync_events > 0) && |
| 1450 | (softc->ipf_ticks > |
| 1451 | softs->ipf_sync_lastwakeup + softs->ipf_sync_wake_interval)) { |
| 1452 | ipf_sync_poll_wakeup(softc); |
| 1453 | } |
| 1454 | } |
| 1455 | |