ip_nat.c revision 1.9.2.1
1 /* $NetBSD: ip_nat.c,v 1.9.2.1 2014/05/18 17:46:03 rmind Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 */ 8 #if defined(KERNEL) || defined(_KERNEL) 9 # undef KERNEL 10 # undef KERNEL 11 # define KERNEL 1 12 # define KERNEL 1 13 #endif 14 #include <sys/errno.h> 15 #include <sys/types.h> 16 #include <sys/param.h> 17 #include <sys/time.h> 18 #include <sys/file.h> 19 #if defined(_KERNEL) && \ 20 (defined(__NetBSD_Version) && (__NetBSD_Version >= 399002000)) 21 # include <sys/kauth.h> 22 #endif 23 #if !defined(_KERNEL) 24 # include <stdio.h> 25 # include <string.h> 26 # include <stdlib.h> 27 # define KERNEL 28 # ifdef _OpenBSD__ 29 struct file; 30 # endif 31 # include <sys/uio.h> 32 # undef KERNEL 33 #endif 34 #if defined(_KERNEL) && \ 35 defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) 36 # include <sys/filio.h> 37 # include <sys/fcntl.h> 38 #else 39 # include <sys/ioctl.h> 40 #endif 41 #if !defined(AIX) 42 # include <sys/fcntl.h> 43 #endif 44 #if !defined(linux) 45 # include <sys/protosw.h> 46 #endif 47 #include <sys/socket.h> 48 #if defined(_KERNEL) 49 # include <sys/systm.h> 50 # if !defined(__SVR4) && !defined(__svr4__) 51 # include <sys/mbuf.h> 52 # endif 53 #endif 54 #if defined(__SVR4) || defined(__svr4__) 55 # include <sys/filio.h> 56 # include <sys/byteorder.h> 57 # ifdef KERNEL 58 # include <sys/dditypes.h> 59 # endif 60 # include <sys/stream.h> 61 # include <sys/kmem.h> 62 #endif 63 #if _FreeBSD_version >= 300000 64 # include <sys/queue.h> 65 #endif 66 #include <net/if.h> 67 #if _FreeBSD_version >= 300000 68 # include <net/if_var.h> 69 #endif 70 #ifdef sun 71 # include <net/af.h> 72 #endif 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/ip.h> 76 77 #ifdef RFC1825 78 # include <vpn/md5.h> 79 # include <vpn/ipsec.h> 80 extern struct ifnet vpnif; 81 #endif 82 83 #if !defined(linux) 84 # include <netinet/ip_var.h> 85 #endif 86 #include <netinet/tcp.h> 87 #include <netinet/udp.h> 88 #include <netinet/ip_icmp.h> 89 #include "netinet/ip_compat.h" 90 #include <netinet/tcpip.h> 91 #include "netinet/ipl.h" 92 #include "netinet/ip_fil.h" 93 #include "netinet/ip_nat.h" 94 #include "netinet/ip_frag.h" 95 #include "netinet/ip_state.h" 96 #include "netinet/ip_proxy.h" 97 #include "netinet/ip_lookup.h" 98 #include "netinet/ip_dstlist.h" 99 #include "netinet/ip_sync.h" 100 #if FREEBSD_GE_REV(300000) 101 # include <sys/malloc.h> 102 #endif 103 #ifdef HAS_SYS_MD5_H 104 # include <sys/md5.h> 105 #else 106 # include "md5.h" 107 #endif 108 /* END OF INCLUDES */ 109 110 #undef SOCKADDR_IN 111 #define SOCKADDR_IN struct sockaddr_in 112 113 #if !defined(lint) 114 #if defined(__NetBSD__) 115 #include <sys/cdefs.h> 116 __KERNEL_RCSID(0, "$NetBSD: ip_nat.c,v 1.9.2.1 2014/05/18 17:46:03 rmind Exp $"); 117 #else 118 static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed"; 119 static const char rcsid[] = "@(#)Id: ip_nat.c,v 1.1.1.2 2012/07/22 13:45:27 darrenr Exp"; 120 #endif 121 #endif 122 123 124 #define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \ 125 (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3]) 126 #define NBUMP(x) softn->(x)++ 127 #define NBUMPD(x, y) do { \ 128 softn->x.y++; \ 129 DT(y); \ 130 } while (0) 131 #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++ 132 #define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \ 133 DT(x); } while (0) 134 #define NBUMPSIDEX(y,x,z) \ 135 do { softn->ipf_nat_stats.ns_side[y].x++; \ 136 DT(z); } while (0) 137 #define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \ 138 DT1(x, fr_info_t *, fin); } while (0) 139 140 frentry_t ipfnatblock; 141 142 static ipftuneable_t ipf_nat_tuneables[] = { 143 /* nat */ 144 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) }, 145 "nat_lock", 0, 1, 146 stsizeof(ipf_nat_softc_t, ipf_nat_lock), 147 IPFT_RDONLY, NULL, NULL }, 148 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) }, 149 "nat_table_size", 1, 0x7fffffff, 150 stsizeof(ipf_nat_softc_t, ipf_nat_table_sz), 151 0, NULL, ipf_nat_rehash }, 152 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) }, 153 "nat_table_max", 1, 0x7fffffff, 154 stsizeof(ipf_nat_softc_t, ipf_nat_table_max), 155 0, NULL, NULL }, 156 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) }, 157 "nat_rules_size", 1, 0x7fffffff, 158 stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz), 159 0, NULL, ipf_nat_rehash_rules }, 160 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) }, 161 "rdr_rules_size", 1, 0x7fffffff, 162 stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz), 163 0, NULL, ipf_nat_rehash_rules }, 164 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) }, 165 "hostmap_size", 1, 0x7fffffff, 166 stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz), 167 0, NULL, ipf_nat_hostmap_rehash }, 168 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) }, 169 "nat_maxbucket",1, 0x7fffffff, 170 stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket), 171 0, NULL, NULL }, 172 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) }, 173 "nat_logging", 0, 1, 174 stsizeof(ipf_nat_softc_t, ipf_nat_logging), 175 0, NULL, NULL }, 176 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) }, 177 "nat_doflush", 0, 1, 178 stsizeof(ipf_nat_softc_t, ipf_nat_doflush), 179 0, NULL, NULL }, 180 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) }, 181 "nat_table_wm_low", 1, 99, 182 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low), 183 0, NULL, NULL }, 184 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) }, 185 "nat_table_wm_high", 2, 100, 186 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high), 187 0, NULL, NULL }, 188 { { 0 }, 189 NULL, 0, 0, 190 0, 191 0, NULL, NULL } 192 }; 193 194 /* ======================================================================== */ 195 /* How the NAT is organised and works. */ 196 /* */ 197 /* Inside (interface y) NAT Outside (interface x) */ 198 /* -------------------- -+- ------------------------------------- */ 199 /* Packet going | out, processsed by ipf_nat_checkout() for x */ 200 /* ------------> | ------------> */ 201 /* src=10.1.1.1 | src=192.1.1.1 */ 202 /* | */ 203 /* | in, processed by ipf_nat_checkin() for x */ 204 /* <------------ | <------------ */ 205 /* dst=10.1.1.1 | dst=192.1.1.1 */ 206 /* -------------------- -+- ------------------------------------- */ 207 /* ipf_nat_checkout() - changes ip_src and if required, sport */ 208 /* - creates a new mapping, if required. */ 209 /* ipf_nat_checkin() - changes ip_dst and if required, dport */ 210 /* */ 211 /* In the NAT table, internal source is recorded as "in" and externally */ 212 /* seen as "out". */ 213 /* ======================================================================== */ 214 215 216 #if SOLARIS && !defined(INSTANCES) 217 extern int pfil_delayed_copy; 218 #endif 219 220 static int ipf_nat_flush_entry(ipf_main_softc_t *, void *); 221 static int ipf_nat_getent(ipf_main_softc_t *, void *, int); 222 static int ipf_nat_getsz(ipf_main_softc_t *, void *, int); 223 static int ipf_nat_putent(ipf_main_softc_t *, void *, int); 224 static void ipf_nat_addmap(ipf_nat_softc_t *, ipnat_t *); 225 static void ipf_nat_addrdr(ipf_nat_softc_t *, ipnat_t *); 226 static int ipf_nat_builddivertmp(ipf_nat_softc_t *, ipnat_t *); 227 static int ipf_nat_clearlist(ipf_main_softc_t *, ipf_nat_softc_t *); 228 static int ipf_nat_cmp_rules(ipnat_t *, ipnat_t *); 229 static int ipf_nat_decap(fr_info_t *, nat_t *); 230 static void ipf_nat_delrule(ipf_main_softc_t *, ipf_nat_softc_t *, 231 ipnat_t *, int); 232 static int ipf_nat_extraflush(ipf_main_softc_t *, ipf_nat_softc_t *, int); 233 static int ipf_nat_finalise(fr_info_t *, nat_t *); 234 static int ipf_nat_flushtable(ipf_main_softc_t *, ipf_nat_softc_t *); 235 static int ipf_nat_getnext(ipf_main_softc_t *, ipftoken_t *, 236 ipfgeniter_t *, ipfobj_t *); 237 static int ipf_nat_gettable(ipf_main_softc_t *, ipf_nat_softc_t *, char *); 238 static hostmap_t *ipf_nat_hostmap(ipf_nat_softc_t *, ipnat_t *, 239 struct in_addr, struct in_addr, 240 struct in_addr, u_32_t); 241 static int ipf_nat_icmpquerytype(int); 242 static int ipf_nat_iterator(ipf_main_softc_t *, ipftoken_t *, 243 ipfgeniter_t *, ipfobj_t *); 244 static int ipf_nat_match(fr_info_t *, ipnat_t *); 245 static int ipf_nat_matcharray(nat_t *, int *, u_long); 246 static int ipf_nat_matchflush(ipf_main_softc_t *, ipf_nat_softc_t *, 247 void *); 248 static void ipf_nat_mssclamp(tcphdr_t *, u_32_t, fr_info_t *, u_short *); 249 static int ipf_nat_newmap(fr_info_t *, nat_t *, natinfo_t *); 250 static int ipf_nat_newdivert(fr_info_t *, nat_t *, natinfo_t *); 251 static int ipf_nat_newrdr(fr_info_t *, nat_t *, natinfo_t *); 252 static int ipf_nat_newrewrite(fr_info_t *, nat_t *, natinfo_t *); 253 static int ipf_nat_nextaddr(fr_info_t *, nat_addr_t *, u_32_t *, u_32_t *); 254 static int ipf_nat_nextaddrinit(ipf_main_softc_t *, char *, 255 nat_addr_t *, int, void *); 256 static int ipf_nat_resolverule(ipf_main_softc_t *, ipnat_t *); 257 static int ipf_nat_ruleaddrinit(ipf_main_softc_t *, 258 ipf_nat_softc_t *, ipnat_t *); 259 static void ipf_nat_rule_fini(ipf_main_softc_t *, ipnat_t *); 260 static int ipf_nat_rule_init(ipf_main_softc_t *, ipf_nat_softc_t *, 261 ipnat_t *); 262 static int ipf_nat_siocaddnat(ipf_main_softc_t *, ipf_nat_softc_t *, 263 ipnat_t *, int); 264 static void ipf_nat_siocdelnat(ipf_main_softc_t *, ipf_nat_softc_t *, 265 ipnat_t *, int); 266 static void ipf_nat_tabmove(ipf_nat_softc_t *, nat_t *); 267 268 /* ------------------------------------------------------------------------ */ 269 /* Function: ipf_nat_main_load */ 270 /* Returns: int - 0 == success, -1 == failure */ 271 /* Parameters: Nil */ 272 /* */ 273 /* The only global NAT structure that needs to be initialised is the filter */ 274 /* rule that is used with blocking packets. */ 275 /* ------------------------------------------------------------------------ */ 276 int 277 ipf_nat_main_load(void) 278 { 279 bzero((char *)&ipfnatblock, sizeof(ipfnatblock)); 280 ipfnatblock.fr_flags = FR_BLOCK|FR_QUICK; 281 ipfnatblock.fr_ref = 1; 282 283 return 0; 284 } 285 286 287 /* ------------------------------------------------------------------------ */ 288 /* Function: ipf_nat_main_unload */ 289 /* Returns: int - 0 == success, -1 == failure */ 290 /* Parameters: Nil */ 291 /* */ 292 /* A null-op function that exists as a placeholder so that the flow in */ 293 /* other functions is obvious. */ 294 /* ------------------------------------------------------------------------ */ 295 int 296 ipf_nat_main_unload(void) 297 { 298 return 0; 299 } 300 301 302 /* ------------------------------------------------------------------------ */ 303 /* Function: ipf_nat_soft_create */ 304 /* Returns: void * - NULL = failure, else pointer to NAT context */ 305 /* Parameters: softc(I) - pointer to soft context main structure */ 306 /* */ 307 /* Allocate the initial soft context structure for NAT and populate it with */ 308 /* some default values. Creating the tables is left until we call _init so */ 309 /* that sizes can be changed before we get under way. */ 310 /* ------------------------------------------------------------------------ */ 311 void * 312 ipf_nat_soft_create(ipf_main_softc_t *softc) 313 { 314 ipf_nat_softc_t *softn; 315 316 KMALLOC(softn, ipf_nat_softc_t *); 317 if (softn == NULL) 318 return NULL; 319 320 bzero((char *)softn, sizeof(*softn)); 321 322 softn->ipf_nat_tune = ipf_tune_array_copy(softn, 323 sizeof(ipf_nat_tuneables), 324 ipf_nat_tuneables); 325 if (softn->ipf_nat_tune == NULL) { 326 ipf_nat_soft_destroy(softc, softn); 327 return NULL; 328 } 329 if (ipf_tune_array_link(softc, softn->ipf_nat_tune) == -1) { 330 ipf_nat_soft_destroy(softc, softn); 331 return NULL; 332 } 333 334 softn->ipf_nat_list_tail = &softn->ipf_nat_list; 335 336 softn->ipf_nat_table_max = NAT_TABLE_MAX; 337 softn->ipf_nat_table_sz = NAT_TABLE_SZ; 338 softn->ipf_nat_maprules_sz = NAT_SIZE; 339 softn->ipf_nat_rdrrules_sz = RDR_SIZE; 340 softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE; 341 softn->ipf_nat_doflush = 0; 342 #ifdef IPFILTER_LOG 343 softn->ipf_nat_logging = 1; 344 #else 345 softn->ipf_nat_logging = 0; 346 #endif 347 348 softn->ipf_nat_defage = DEF_NAT_AGE; 349 softn->ipf_nat_defipage = IPF_TTLVAL(60); 350 softn->ipf_nat_deficmpage = IPF_TTLVAL(3); 351 softn->ipf_nat_table_wm_high = 99; 352 softn->ipf_nat_table_wm_low = 90; 353 354 return softn; 355 } 356 357 /* ------------------------------------------------------------------------ */ 358 /* Function: ipf_nat_soft_destroy */ 359 /* Returns: Nil */ 360 /* Parameters: softc(I) - pointer to soft context main structure */ 361 /* */ 362 /* ------------------------------------------------------------------------ */ 363 void 364 ipf_nat_soft_destroy(ipf_main_softc_t *softc, void *arg) 365 { 366 ipf_nat_softc_t *softn = arg; 367 368 if (softn->ipf_nat_tune != NULL) { 369 ipf_tune_array_unlink(softc, softn->ipf_nat_tune); 370 KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables)); 371 softn->ipf_nat_tune = NULL; 372 } 373 374 KFREE(softn); 375 } 376 377 378 /* ------------------------------------------------------------------------ */ 379 /* Function: ipf_nat_init */ 380 /* Returns: int - 0 == success, -1 == failure */ 381 /* Parameters: softc(I) - pointer to soft context main structure */ 382 /* */ 383 /* Initialise all of the NAT locks, tables and other structures. */ 384 /* ------------------------------------------------------------------------ */ 385 int 386 ipf_nat_soft_init(ipf_main_softc_t *softc, void *arg) 387 { 388 ipf_nat_softc_t *softn = arg; 389 ipftq_t *tq; 390 int i; 391 392 KMALLOCS(softn->ipf_nat_table[0], nat_t **, \ 393 sizeof(nat_t *) * softn->ipf_nat_table_sz); 394 395 if (softn->ipf_nat_table[0] != NULL) { 396 bzero((char *)softn->ipf_nat_table[0], 397 softn->ipf_nat_table_sz * sizeof(nat_t *)); 398 } else { 399 return -1; 400 } 401 402 KMALLOCS(softn->ipf_nat_table[1], nat_t **, \ 403 sizeof(nat_t *) * softn->ipf_nat_table_sz); 404 405 if (softn->ipf_nat_table[1] != NULL) { 406 bzero((char *)softn->ipf_nat_table[1], 407 softn->ipf_nat_table_sz * sizeof(nat_t *)); 408 } else { 409 return -2; 410 } 411 412 KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \ 413 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 414 415 if (softn->ipf_nat_map_rules != NULL) { 416 bzero((char *)softn->ipf_nat_map_rules, 417 softn->ipf_nat_maprules_sz * sizeof(ipnat_t *)); 418 } else { 419 return -3; 420 } 421 422 KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \ 423 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 424 425 if (softn->ipf_nat_rdr_rules != NULL) { 426 bzero((char *)softn->ipf_nat_rdr_rules, 427 softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *)); 428 } else { 429 return -4; 430 } 431 432 KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \ 433 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 434 435 if (softn->ipf_hm_maptable != NULL) { 436 bzero((char *)softn->ipf_hm_maptable, 437 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 438 } else { 439 return -5; 440 } 441 softn->ipf_hm_maplist = NULL; 442 443 KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *, 444 softn->ipf_nat_table_sz * sizeof(u_int)); 445 446 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) { 447 return -6; 448 } 449 bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 450 softn->ipf_nat_table_sz * sizeof(u_int)); 451 452 KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *, 453 softn->ipf_nat_table_sz * sizeof(u_int)); 454 455 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) { 456 return -7; 457 } 458 459 bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 460 softn->ipf_nat_table_sz * sizeof(u_int)); 461 462 if (softn->ipf_nat_maxbucket == 0) { 463 for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1) 464 softn->ipf_nat_maxbucket++; 465 softn->ipf_nat_maxbucket *= 2; 466 } 467 468 ipf_sttab_init(softc, softn->ipf_nat_tcptq); 469 /* 470 * Increase this because we may have "keep state" following this too 471 * and packet storms can occur if this is removed too quickly. 472 */ 473 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 474 softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next = 475 &softn->ipf_nat_udptq; 476 477 IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage, 478 "nat ipftq udp tab"); 479 softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq; 480 481 IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage, 482 "nat ipftq udpack tab"); 483 softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq; 484 485 IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage, 486 "nat icmp ipftq tab"); 487 softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq; 488 489 IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage, 490 "nat icmpack ipftq tab"); 491 softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq; 492 493 IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage, 494 "nat ip ipftq tab"); 495 softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending; 496 497 IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab"); 498 softn->ipf_nat_pending.ifq_next = NULL; 499 500 for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) { 501 if (tq->ifq_ttl < softn->ipf_nat_deficmpage) 502 tq->ifq_ttl = softn->ipf_nat_deficmpage; 503 #ifdef LARGE_NAT 504 else if (tq->ifq_ttl > softn->ipf_nat_defage) 505 tq->ifq_ttl = softn->ipf_nat_defage; 506 #endif 507 } 508 509 /* 510 * Increase this because we may have "keep state" following 511 * this too and packet storms can occur if this is removed 512 * too quickly. 513 */ 514 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 515 516 MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex"); 517 MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex"); 518 519 softn->ipf_nat_inited = 1; 520 521 return 0; 522 } 523 524 525 /* ------------------------------------------------------------------------ */ 526 /* Function: ipf_nat_soft_fini */ 527 /* Returns: Nil */ 528 /* Parameters: softc(I) - pointer to soft context main structure */ 529 /* */ 530 /* Free all memory used by NAT structures allocated at runtime. */ 531 /* ------------------------------------------------------------------------ */ 532 int 533 ipf_nat_soft_fini(ipf_main_softc_t *softc, void *arg) 534 { 535 ipf_nat_softc_t *softn = arg; 536 ipftq_t *ifq, *ifqnext; 537 538 (void) ipf_nat_clearlist(softc, softn); 539 (void) ipf_nat_flushtable(softc, softn); 540 541 /* 542 * Proxy timeout queues are not cleaned here because although they 543 * exist on the NAT list, ipf_proxy_unload is called after unload 544 * and the proxies actually are responsible for them being created. 545 * Should the proxy timeouts have their own list? There's no real 546 * justification as this is the only complication. 547 */ 548 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 549 ifqnext = ifq->ifq_next; 550 if (ipf_deletetimeoutqueue(ifq) == 0) 551 ipf_freetimeoutqueue(softc, ifq); 552 } 553 554 if (softn->ipf_nat_table[0] != NULL) { 555 KFREES(softn->ipf_nat_table[0], 556 sizeof(nat_t *) * softn->ipf_nat_table_sz); 557 softn->ipf_nat_table[0] = NULL; 558 } 559 if (softn->ipf_nat_table[1] != NULL) { 560 KFREES(softn->ipf_nat_table[1], 561 sizeof(nat_t *) * softn->ipf_nat_table_sz); 562 softn->ipf_nat_table[1] = NULL; 563 } 564 if (softn->ipf_nat_map_rules != NULL) { 565 KFREES(softn->ipf_nat_map_rules, 566 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 567 softn->ipf_nat_map_rules = NULL; 568 } 569 if (softn->ipf_nat_rdr_rules != NULL) { 570 KFREES(softn->ipf_nat_rdr_rules, 571 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 572 softn->ipf_nat_rdr_rules = NULL; 573 } 574 if (softn->ipf_hm_maptable != NULL) { 575 KFREES(softn->ipf_hm_maptable, 576 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 577 softn->ipf_hm_maptable = NULL; 578 } 579 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 580 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 581 sizeof(u_int) * softn->ipf_nat_table_sz); 582 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL; 583 } 584 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 585 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 586 sizeof(u_int) * softn->ipf_nat_table_sz); 587 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL; 588 } 589 590 if (softn->ipf_nat_inited == 1) { 591 softn->ipf_nat_inited = 0; 592 ipf_sttab_destroy(softn->ipf_nat_tcptq); 593 594 MUTEX_DESTROY(&softn->ipf_nat_new); 595 MUTEX_DESTROY(&softn->ipf_nat_io); 596 597 MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock); 598 MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock); 599 MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock); 600 MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock); 601 MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock); 602 MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock); 603 } 604 605 return 0; 606 } 607 608 609 /* ------------------------------------------------------------------------ */ 610 /* Function: ipf_nat_setlock */ 611 /* Returns: Nil */ 612 /* Parameters: arg(I) - pointer to soft state information */ 613 /* tmp(I) - new lock value */ 614 /* */ 615 /* Set the "lock status" of NAT to the value in tmp. */ 616 /* ------------------------------------------------------------------------ */ 617 void 618 ipf_nat_setlock(void *arg, int tmp) 619 { 620 ipf_nat_softc_t *softn = arg; 621 622 softn->ipf_nat_lock = tmp; 623 } 624 625 626 /* ------------------------------------------------------------------------ */ 627 /* Function: ipf_nat_addrdr */ 628 /* Returns: Nil */ 629 /* Parameters: n(I) - pointer to NAT rule to add */ 630 /* */ 631 /* Adds a redirect rule to the hash table of redirect rules and the list of */ 632 /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */ 633 /* use by redirect rules. */ 634 /* ------------------------------------------------------------------------ */ 635 static void 636 ipf_nat_addrdr(ipf_nat_softc_t *softn, ipnat_t *n) 637 { 638 ipnat_t **np; 639 u_32_t j; 640 u_int hv; 641 u_int rhv; 642 int k; 643 644 if (n->in_odstatype == FRI_NORMAL) { 645 k = count4bits(n->in_odstmsk); 646 ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask); 647 j = (n->in_odstaddr & n->in_odstmsk); 648 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 649 } else { 650 ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask); 651 j = 0; 652 rhv = 0; 653 } 654 hv = rhv % softn->ipf_nat_rdrrules_sz; 655 np = softn->ipf_nat_rdr_rules + hv; 656 while (*np != NULL) 657 np = &(*np)->in_rnext; 658 n->in_rnext = NULL; 659 n->in_prnext = np; 660 n->in_hv[0] = hv; 661 n->in_use++; 662 *np = n; 663 } 664 665 666 /* ------------------------------------------------------------------------ */ 667 /* Function: ipf_nat_addmap */ 668 /* Returns: Nil */ 669 /* Parameters: n(I) - pointer to NAT rule to add */ 670 /* */ 671 /* Adds a NAT map rule to the hash table of rules and the list of loaded */ 672 /* NAT rules. Updates the bitmask indicating which netmasks are in use by */ 673 /* redirect rules. */ 674 /* ------------------------------------------------------------------------ */ 675 static void 676 ipf_nat_addmap(ipf_nat_softc_t *softn, ipnat_t *n) 677 { 678 ipnat_t **np; 679 u_32_t j; 680 u_int hv; 681 u_int rhv; 682 int k; 683 684 if (n->in_osrcatype == FRI_NORMAL) { 685 k = count4bits(n->in_osrcmsk); 686 ipf_inet_mask_add(k, &softn->ipf_nat_map_mask); 687 j = (n->in_osrcaddr & n->in_osrcmsk); 688 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 689 } else { 690 ipf_inet_mask_add(0, &softn->ipf_nat_map_mask); 691 j = 0; 692 rhv = 0; 693 } 694 hv = rhv % softn->ipf_nat_maprules_sz; 695 np = softn->ipf_nat_map_rules + hv; 696 while (*np != NULL) 697 np = &(*np)->in_mnext; 698 n->in_mnext = NULL; 699 n->in_pmnext = np; 700 n->in_hv[1] = rhv; 701 n->in_use++; 702 *np = n; 703 } 704 705 706 /* ------------------------------------------------------------------------ */ 707 /* Function: ipf_nat_delrdr */ 708 /* Returns: Nil */ 709 /* Parameters: n(I) - pointer to NAT rule to delete */ 710 /* */ 711 /* Removes a redirect rule from the hash table of redirect rules. */ 712 /* ------------------------------------------------------------------------ */ 713 void 714 ipf_nat_delrdr(ipf_nat_softc_t *softn, ipnat_t *n) 715 { 716 if (n->in_odstatype == FRI_NORMAL) { 717 int k = count4bits(n->in_odstmsk); 718 ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask); 719 } else { 720 ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask); 721 } 722 if (n->in_rnext) 723 n->in_rnext->in_prnext = n->in_prnext; 724 *n->in_prnext = n->in_rnext; 725 n->in_use--; 726 } 727 728 729 /* ------------------------------------------------------------------------ */ 730 /* Function: ipf_nat_delmap */ 731 /* Returns: Nil */ 732 /* Parameters: n(I) - pointer to NAT rule to delete */ 733 /* */ 734 /* Removes a NAT map rule from the hash table of NAT map rules. */ 735 /* ------------------------------------------------------------------------ */ 736 void 737 ipf_nat_delmap(ipf_nat_softc_t *softn, ipnat_t *n) 738 { 739 if (n->in_osrcatype == FRI_NORMAL) { 740 int k = count4bits(n->in_osrcmsk); 741 ipf_inet_mask_del(k, &softn->ipf_nat_map_mask); 742 } else { 743 ipf_inet_mask_del(0, &softn->ipf_nat_map_mask); 744 } 745 if (n->in_mnext != NULL) 746 n->in_mnext->in_pmnext = n->in_pmnext; 747 *n->in_pmnext = n->in_mnext; 748 n->in_use--; 749 } 750 751 752 /* ------------------------------------------------------------------------ */ 753 /* Function: ipf_nat_hostmap */ 754 /* Returns: struct hostmap* - NULL if no hostmap could be created, */ 755 /* else a pointer to the hostmapping to use */ 756 /* Parameters: np(I) - pointer to NAT rule */ 757 /* real(I) - real IP address */ 758 /* map(I) - mapped IP address */ 759 /* port(I) - destination port number */ 760 /* Write Locks: ipf_nat */ 761 /* */ 762 /* Check if an ip address has already been allocated for a given mapping */ 763 /* that is not doing port based translation. If is not yet allocated, then */ 764 /* create a new entry if a non-NULL NAT rule pointer has been supplied. */ 765 /* ------------------------------------------------------------------------ */ 766 static struct hostmap * 767 ipf_nat_hostmap(ipf_nat_softc_t *softn, ipnat_t *np, struct in_addr src, 768 struct in_addr dst, struct in_addr map, u_32_t port) 769 { 770 hostmap_t *hm; 771 u_int hv, rhv; 772 773 hv = (src.s_addr ^ dst.s_addr); 774 hv += src.s_addr; 775 hv += dst.s_addr; 776 rhv = hv; 777 hv %= softn->ipf_nat_hostmap_sz; 778 for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext) 779 if ((hm->hm_osrcip.s_addr == src.s_addr) && 780 (hm->hm_odstip.s_addr == dst.s_addr) && 781 ((np == NULL) || (np == hm->hm_ipnat)) && 782 ((port == 0) || (port == hm->hm_port))) { 783 softn->ipf_nat_stats.ns_hm_addref++; 784 hm->hm_ref++; 785 return hm; 786 } 787 788 if (np == NULL) { 789 softn->ipf_nat_stats.ns_hm_nullnp++; 790 return NULL; 791 } 792 793 KMALLOC(hm, hostmap_t *); 794 if (hm) { 795 hm->hm_next = softn->ipf_hm_maplist; 796 hm->hm_pnext = &softn->ipf_hm_maplist; 797 if (softn->ipf_hm_maplist != NULL) 798 softn->ipf_hm_maplist->hm_pnext = &hm->hm_next; 799 softn->ipf_hm_maplist = hm; 800 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 801 hm->hm_phnext = softn->ipf_hm_maptable + hv; 802 if (softn->ipf_hm_maptable[hv] != NULL) 803 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 804 softn->ipf_hm_maptable[hv] = hm; 805 hm->hm_ipnat = np; 806 np->in_use++; 807 hm->hm_osrcip = src; 808 hm->hm_odstip = dst; 809 hm->hm_nsrcip = map; 810 hm->hm_ndstip.s_addr = 0; 811 hm->hm_ref = 1; 812 hm->hm_port = port; 813 hm->hm_hv = rhv; 814 hm->hm_v = 4; 815 softn->ipf_nat_stats.ns_hm_new++; 816 } else { 817 softn->ipf_nat_stats.ns_hm_newfail++; 818 } 819 return hm; 820 } 821 822 823 /* ------------------------------------------------------------------------ */ 824 /* Function: ipf_nat_hostmapdel */ 825 /* Returns: Nil */ 826 /* Parameters: hmp(I) - pointer to hostmap structure pointer */ 827 /* Write Locks: ipf_nat */ 828 /* */ 829 /* Decrement the references to this hostmap structure by one. If this */ 830 /* reaches zero then remove it and free it. */ 831 /* ------------------------------------------------------------------------ */ 832 void 833 ipf_nat_hostmapdel(ipf_main_softc_t *softc, struct hostmap **hmp) 834 { 835 struct hostmap *hm; 836 837 hm = *hmp; 838 *hmp = NULL; 839 840 hm->hm_ref--; 841 if (hm->hm_ref == 0) { 842 ipf_nat_rule_deref(softc, &hm->hm_ipnat); 843 if (hm->hm_hnext) 844 hm->hm_hnext->hm_phnext = hm->hm_phnext; 845 *hm->hm_phnext = hm->hm_hnext; 846 if (hm->hm_next) 847 hm->hm_next->hm_pnext = hm->hm_pnext; 848 *hm->hm_pnext = hm->hm_next; 849 KFREE(hm); 850 } 851 } 852 853 854 /* ------------------------------------------------------------------------ */ 855 /* Function: ipf_fix_outcksum */ 856 /* Returns: Nil */ 857 /* Parameters: fin(I) - pointer to packet information */ 858 /* sp(I) - location of 16bit checksum to update */ 859 /* n((I) - amount to adjust checksum by */ 860 /* */ 861 /* Adjusts the 16bit checksum by "n" for packets going out. */ 862 /* ------------------------------------------------------------------------ */ 863 void 864 ipf_fix_outcksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) 865 { 866 u_short sumshort; 867 u_32_t sum1; 868 869 if (n == 0) 870 return; 871 872 if (cksum == 4) { 873 *sp = 0; 874 return; 875 } 876 if (cksum == 2) { 877 sum1 = partial; 878 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 879 *sp = htons(sum1); 880 return; 881 } 882 sum1 = (~ntohs(*sp)) & 0xffff; 883 sum1 += (n); 884 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 885 /* Again */ 886 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 887 sumshort = ~(u_short)sum1; 888 *(sp) = htons(sumshort); 889 } 890 891 892 /* ------------------------------------------------------------------------ */ 893 /* Function: ipf_fix_incksum */ 894 /* Returns: Nil */ 895 /* Parameters: fin(I) - pointer to packet information */ 896 /* sp(I) - location of 16bit checksum to update */ 897 /* n((I) - amount to adjust checksum by */ 898 /* */ 899 /* Adjusts the 16bit checksum by "n" for packets going in. */ 900 /* ------------------------------------------------------------------------ */ 901 void 902 ipf_fix_incksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) 903 { 904 u_short sumshort; 905 u_32_t sum1; 906 907 if (n == 0) 908 return; 909 910 if (cksum == 4) { 911 *sp = 0; 912 return; 913 } 914 if (cksum == 2) { 915 sum1 = partial; 916 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 917 *sp = htons(sum1); 918 return; 919 } 920 921 sum1 = (~ntohs(*sp)) & 0xffff; 922 sum1 += ~(n) & 0xffff; 923 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 924 /* Again */ 925 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 926 sumshort = ~(u_short)sum1; 927 *(sp) = htons(sumshort); 928 } 929 930 931 /* ------------------------------------------------------------------------ */ 932 /* Function: ipf_fix_datacksum */ 933 /* Returns: Nil */ 934 /* Parameters: sp(I) - location of 16bit checksum to update */ 935 /* n((I) - amount to adjust checksum by */ 936 /* */ 937 /* Fix_datacksum is used *only* for the adjustments of checksums in the */ 938 /* data section of an IP packet. */ 939 /* */ 940 /* The only situation in which you need to do this is when NAT'ing an */ 941 /* ICMP error message. Such a message, contains in its body the IP header */ 942 /* of the original IP packet, that causes the error. */ 943 /* */ 944 /* You can't use fix_incksum or fix_outcksum in that case, because for the */ 945 /* kernel the data section of the ICMP error is just data, and no special */ 946 /* processing like hardware cksum or ntohs processing have been done by the */ 947 /* kernel on the data section. */ 948 /* ------------------------------------------------------------------------ */ 949 void 950 ipf_fix_datacksum(u_short *sp, u_32_t n) 951 { 952 u_short sumshort; 953 u_32_t sum1; 954 955 if (n == 0) 956 return; 957 958 sum1 = (~ntohs(*sp)) & 0xffff; 959 sum1 += (n); 960 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 961 /* Again */ 962 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 963 sumshort = ~(u_short)sum1; 964 *(sp) = htons(sumshort); 965 } 966 967 968 /* ------------------------------------------------------------------------ */ 969 /* Function: ipf_nat_ioctl */ 970 /* Returns: int - 0 == success, != 0 == failure */ 971 /* Parameters: softc(I) - pointer to soft context main structure */ 972 /* data(I) - pointer to ioctl data */ 973 /* cmd(I) - ioctl command integer */ 974 /* mode(I) - file mode bits used with open */ 975 /* uid(I) - uid of calling process */ 976 /* ctx(I) - pointer used as key for finding context */ 977 /* */ 978 /* Processes an ioctl call made to operate on the IP Filter NAT device. */ 979 /* ------------------------------------------------------------------------ */ 980 int 981 ipf_nat_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, 982 int uid, void *ctx) 983 { 984 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 985 int error = 0, ret, arg, getlock; 986 ipnat_t *nat, *nt, *n; 987 ipnat_t natd; 988 SPL_INT(s); 989 990 #if BSD_GE_YEAR(199306) && defined(_KERNEL) 991 # if NETBSD_GE_REV(399002000) 992 if ((mode & FWRITE) && 993 kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL, 994 KAUTH_REQ_NETWORK_FIREWALL_FW, 995 NULL, NULL, NULL)) 996 # else 997 # if defined(__FreeBSD_version) && (__FreeBSD_version >= 500034) 998 if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE)) 999 # else 1000 if ((securelevel >= 3) && (mode & FWRITE)) 1001 # endif 1002 # endif 1003 { 1004 IPFERROR(60001); 1005 return EPERM; 1006 } 1007 #endif 1008 1009 #if defined(__osf__) && defined(_KERNEL) 1010 getlock = 0; 1011 #else 1012 getlock = (mode & NAT_LOCKHELD) ? 0 : 1; 1013 #endif 1014 1015 n = NULL; 1016 nt = NULL; 1017 nat = NULL; 1018 1019 if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) || 1020 (cmd == (ioctlcmd_t)SIOCPURGENAT)) { 1021 if (mode & NAT_SYSSPACE) { 1022 bcopy(data, (char *)&natd, sizeof(natd)); 1023 nat = &natd; 1024 error = 0; 1025 } else { 1026 bzero(&natd, sizeof(natd)); 1027 error = ipf_inobj(softc, data, NULL, &natd, 1028 IPFOBJ_IPNAT); 1029 if (error != 0) 1030 goto done; 1031 1032 if (natd.in_size < sizeof(ipnat_t)) { 1033 error = EINVAL; 1034 goto done; 1035 } 1036 KMALLOCS(nt, ipnat_t *, natd.in_size); 1037 if (nt == NULL) { 1038 IPFERROR(60070); 1039 error = ENOMEM; 1040 goto done; 1041 } 1042 bzero(nt, natd.in_size); 1043 error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT, 1044 natd.in_size); 1045 if (error) 1046 goto done; 1047 nat = nt; 1048 } 1049 1050 /* 1051 * For add/delete, look to see if the NAT entry is 1052 * already present 1053 */ 1054 nat->in_flags &= IPN_USERFLAGS; 1055 if ((nat->in_redir & NAT_MAPBLK) == 0) { 1056 if (nat->in_osrcatype == FRI_NORMAL || 1057 nat->in_osrcatype == FRI_NONE) 1058 nat->in_osrcaddr &= nat->in_osrcmsk; 1059 if (nat->in_odstatype == FRI_NORMAL || 1060 nat->in_odstatype == FRI_NONE) 1061 nat->in_odstaddr &= nat->in_odstmsk; 1062 if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) { 1063 if (nat->in_nsrcatype == FRI_NORMAL) 1064 nat->in_nsrcaddr &= nat->in_nsrcmsk; 1065 if (nat->in_ndstatype == FRI_NORMAL) 1066 nat->in_ndstaddr &= nat->in_ndstmsk; 1067 } 1068 } 1069 1070 error = ipf_nat_rule_init(softc, softn, nat); 1071 if (error != 0) 1072 goto done; 1073 1074 MUTEX_ENTER(&softn->ipf_nat_io); 1075 for (n = softn->ipf_nat_list; n != NULL; n = n->in_next) 1076 if (ipf_nat_cmp_rules(nat, n) == 0) 1077 break; 1078 } 1079 1080 switch (cmd) 1081 { 1082 #ifdef IPFILTER_LOG 1083 case SIOCIPFFB : 1084 { 1085 int tmp; 1086 1087 if (!(mode & FWRITE)) { 1088 IPFERROR(60002); 1089 error = EPERM; 1090 } else { 1091 tmp = ipf_log_clear(softc, IPL_LOGNAT); 1092 error = BCOPYOUT(&tmp, data, sizeof(tmp)); 1093 if (error != 0) { 1094 IPFERROR(60057); 1095 error = EFAULT; 1096 } 1097 } 1098 break; 1099 } 1100 1101 case SIOCSETLG : 1102 if (!(mode & FWRITE)) { 1103 IPFERROR(60003); 1104 error = EPERM; 1105 } else { 1106 error = BCOPYIN(data, &softn->ipf_nat_logging, 1107 sizeof(softn->ipf_nat_logging)); 1108 if (error != 0) 1109 error = EFAULT; 1110 } 1111 break; 1112 1113 case SIOCGETLG : 1114 error = BCOPYOUT(&softn->ipf_nat_logging, data, 1115 sizeof(softn->ipf_nat_logging)); 1116 if (error != 0) { 1117 IPFERROR(60004); 1118 error = EFAULT; 1119 } 1120 break; 1121 1122 case FIONREAD : 1123 arg = ipf_log_bytesused(softc, IPL_LOGNAT); 1124 error = BCOPYOUT(&arg, data, sizeof(arg)); 1125 if (error != 0) { 1126 IPFERROR(60005); 1127 error = EFAULT; 1128 } 1129 break; 1130 #endif 1131 case SIOCADNAT : 1132 if (!(mode & FWRITE)) { 1133 IPFERROR(60006); 1134 error = EPERM; 1135 } else if (n != NULL) { 1136 natd.in_flineno = n->in_flineno; 1137 (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT); 1138 IPFERROR(60007); 1139 error = EEXIST; 1140 } else if (nt == NULL) { 1141 IPFERROR(60008); 1142 error = ENOMEM; 1143 } 1144 if (error != 0) { 1145 MUTEX_EXIT(&softn->ipf_nat_io); 1146 break; 1147 } 1148 if (nat != nt) 1149 bcopy((char *)nat, (char *)nt, sizeof(*n)); 1150 error = ipf_nat_siocaddnat(softc, softn, nt, getlock); 1151 MUTEX_EXIT(&softn->ipf_nat_io); 1152 if (error == 0) { 1153 nat = NULL; 1154 nt = NULL; 1155 } 1156 break; 1157 1158 case SIOCRMNAT : 1159 case SIOCPURGENAT : 1160 if (!(mode & FWRITE)) { 1161 IPFERROR(60009); 1162 error = EPERM; 1163 n = NULL; 1164 } else if (n == NULL) { 1165 IPFERROR(60010); 1166 error = ESRCH; 1167 } 1168 1169 if (error != 0) { 1170 MUTEX_EXIT(&softn->ipf_nat_io); 1171 break; 1172 } 1173 if (cmd == (ioctlcmd_t)SIOCPURGENAT) { 1174 error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT, 1175 n->in_size); 1176 if (error) { 1177 MUTEX_EXIT(&softn->ipf_nat_io); 1178 goto done; 1179 } 1180 n->in_flags |= IPN_PURGE; 1181 } 1182 ipf_nat_siocdelnat(softc, softn, n, getlock); 1183 1184 MUTEX_EXIT(&softn->ipf_nat_io); 1185 n = NULL; 1186 break; 1187 1188 case SIOCGNATS : 1189 { 1190 natstat_t *nsp = &softn->ipf_nat_stats; 1191 1192 nsp->ns_side[0].ns_table = softn->ipf_nat_table[0]; 1193 nsp->ns_side[1].ns_table = softn->ipf_nat_table[1]; 1194 nsp->ns_list = softn->ipf_nat_list; 1195 nsp->ns_maptable = softn->ipf_hm_maptable; 1196 nsp->ns_maplist = softn->ipf_hm_maplist; 1197 nsp->ns_nattab_sz = softn->ipf_nat_table_sz; 1198 nsp->ns_nattab_max = softn->ipf_nat_table_max; 1199 nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz; 1200 nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz; 1201 nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz; 1202 nsp->ns_instances = softn->ipf_nat_instances; 1203 nsp->ns_ticks = softc->ipf_ticks; 1204 #ifdef IPFILTER_LOGGING 1205 nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT); 1206 nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT); 1207 #else 1208 nsp->ns_log_ok = 0; 1209 nsp->ns_log_fail = 0; 1210 #endif 1211 error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT); 1212 break; 1213 } 1214 1215 case SIOCGNATL : 1216 { 1217 natlookup_t nl; 1218 1219 error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP); 1220 if (error == 0) { 1221 void *ptr; 1222 1223 if (getlock) { 1224 READ_ENTER(&softc->ipf_nat); 1225 } 1226 1227 switch (nl.nl_v) 1228 { 1229 case 4 : 1230 ptr = ipf_nat_lookupredir(&nl); 1231 break; 1232 #ifdef USE_INET6 1233 case 6 : 1234 ptr = ipf_nat6_lookupredir(&nl); 1235 break; 1236 #endif 1237 default: 1238 ptr = NULL; 1239 break; 1240 } 1241 1242 if (getlock) { 1243 RWLOCK_EXIT(&softc->ipf_nat); 1244 } 1245 if (ptr != NULL) { 1246 error = ipf_outobj(softc, data, &nl, 1247 IPFOBJ_NATLOOKUP); 1248 } else { 1249 IPFERROR(60011); 1250 error = ESRCH; 1251 } 1252 } 1253 break; 1254 } 1255 1256 case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */ 1257 if (!(mode & FWRITE)) { 1258 IPFERROR(60012); 1259 error = EPERM; 1260 break; 1261 } 1262 if (getlock) { 1263 WRITE_ENTER(&softc->ipf_nat); 1264 } 1265 1266 error = BCOPYIN(data, &arg, sizeof(arg)); 1267 if (error != 0) { 1268 IPFERROR(60013); 1269 error = EFAULT; 1270 } else { 1271 if (arg == 0) 1272 ret = ipf_nat_flushtable(softc, softn); 1273 else if (arg == 1) 1274 ret = ipf_nat_clearlist(softc, softn); 1275 else 1276 ret = ipf_nat_extraflush(softc, softn, arg); 1277 ipf_proxy_flush(softc->ipf_proxy_soft, arg); 1278 } 1279 1280 if (getlock) { 1281 RWLOCK_EXIT(&softc->ipf_nat); 1282 } 1283 if (error == 0) { 1284 error = BCOPYOUT(&ret, data, sizeof(ret)); 1285 } 1286 break; 1287 1288 case SIOCMATCHFLUSH : 1289 if (!(mode & FWRITE)) { 1290 IPFERROR(60014); 1291 error = EPERM; 1292 break; 1293 } 1294 if (getlock) { 1295 WRITE_ENTER(&softc->ipf_nat); 1296 } 1297 1298 error = ipf_nat_matchflush(softc, softn, data); 1299 1300 if (getlock) { 1301 RWLOCK_EXIT(&softc->ipf_nat); 1302 } 1303 break; 1304 1305 case SIOCPROXY : 1306 error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx); 1307 break; 1308 1309 case SIOCSTLCK : 1310 if (!(mode & FWRITE)) { 1311 IPFERROR(60015); 1312 error = EPERM; 1313 } else { 1314 error = ipf_lock(data, &softn->ipf_nat_lock); 1315 } 1316 break; 1317 1318 case SIOCSTPUT : 1319 if ((mode & FWRITE) != 0) { 1320 error = ipf_nat_putent(softc, data, getlock); 1321 } else { 1322 IPFERROR(60016); 1323 error = EACCES; 1324 } 1325 break; 1326 1327 case SIOCSTGSZ : 1328 if (softn->ipf_nat_lock) { 1329 error = ipf_nat_getsz(softc, data, getlock); 1330 } else { 1331 IPFERROR(60017); 1332 error = EACCES; 1333 } 1334 break; 1335 1336 case SIOCSTGET : 1337 if (softn->ipf_nat_lock) { 1338 error = ipf_nat_getent(softc, data, getlock); 1339 } else { 1340 IPFERROR(60018); 1341 error = EACCES; 1342 } 1343 break; 1344 1345 case SIOCGENITER : 1346 { 1347 ipfgeniter_t iter; 1348 ipftoken_t *token; 1349 ipfobj_t obj; 1350 1351 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER); 1352 if (error != 0) 1353 break; 1354 1355 SPL_SCHED(s); 1356 token = ipf_token_find(softc, iter.igi_type, uid, ctx); 1357 if (token != NULL) { 1358 error = ipf_nat_iterator(softc, token, &iter, &obj); 1359 WRITE_ENTER(&softc->ipf_tokens); 1360 ipf_token_deref(softc, token); 1361 RWLOCK_EXIT(&softc->ipf_tokens); 1362 } 1363 SPL_X(s); 1364 break; 1365 } 1366 1367 case SIOCIPFDELTOK : 1368 error = BCOPYIN(data, &arg, sizeof(arg)); 1369 if (error == 0) { 1370 SPL_SCHED(s); 1371 error = ipf_token_del(softc, arg, uid, ctx); 1372 SPL_X(s); 1373 } else { 1374 IPFERROR(60019); 1375 error = EFAULT; 1376 } 1377 break; 1378 1379 case SIOCGTQTAB : 1380 error = ipf_outobj(softc, data, softn->ipf_nat_tcptq, 1381 IPFOBJ_STATETQTAB); 1382 break; 1383 1384 case SIOCGTABL : 1385 error = ipf_nat_gettable(softc, softn, data); 1386 break; 1387 1388 default : 1389 IPFERROR(60020); 1390 error = EINVAL; 1391 break; 1392 } 1393 done: 1394 if (nat != NULL) 1395 ipf_nat_rule_fini(softc, nat); 1396 if (nt != NULL) 1397 KFREES(nt, nt->in_size); 1398 return error; 1399 } 1400 1401 1402 /* ------------------------------------------------------------------------ */ 1403 /* Function: ipf_nat_siocaddnat */ 1404 /* Returns: int - 0 == success, != 0 == failure */ 1405 /* Parameters: softc(I) - pointer to soft context main structure */ 1406 /* softn(I) - pointer to NAT context structure */ 1407 /* n(I) - pointer to new NAT rule */ 1408 /* np(I) - pointer to where to insert new NAT rule */ 1409 /* getlock(I) - flag indicating if lock on is held */ 1410 /* Mutex Locks: ipf_nat_io */ 1411 /* */ 1412 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1413 /* from information passed to the kernel, then add it to the appropriate */ 1414 /* NAT rule table(s). */ 1415 /* ------------------------------------------------------------------------ */ 1416 static int 1417 ipf_nat_siocaddnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, 1418 int getlock) 1419 { 1420 int error = 0; 1421 1422 if (ipf_nat_resolverule(softc, n) != 0) { 1423 IPFERROR(60022); 1424 return ENOENT; 1425 } 1426 1427 if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) { 1428 IPFERROR(60023); 1429 return EINVAL; 1430 } 1431 1432 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 1433 /* 1434 * Prerecord whether or not the destination of the divert 1435 * is local or not to the interface the packet is going 1436 * to be sent out. 1437 */ 1438 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 1439 n->in_ifps[1], &n->in_ndstip6); 1440 } 1441 1442 if (getlock) { 1443 WRITE_ENTER(&softc->ipf_nat); 1444 } 1445 n->in_next = NULL; 1446 n->in_pnext = softn->ipf_nat_list_tail; 1447 *n->in_pnext = n; 1448 softn->ipf_nat_list_tail = &n->in_next; 1449 n->in_use++; 1450 1451 if (n->in_redir & NAT_REDIRECT) { 1452 n->in_flags &= ~IPN_NOTDST; 1453 switch (n->in_v[0]) 1454 { 1455 case 4 : 1456 ipf_nat_addrdr(softn, n); 1457 break; 1458 #ifdef USE_INET6 1459 case 6 : 1460 ipf_nat6_addrdr(softn, n); 1461 break; 1462 #endif 1463 default : 1464 break; 1465 } 1466 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr); 1467 } 1468 1469 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 1470 n->in_flags &= ~IPN_NOTSRC; 1471 switch (n->in_v[0]) 1472 { 1473 case 4 : 1474 ipf_nat_addmap(softn, n); 1475 break; 1476 #ifdef USE_INET6 1477 case 6 : 1478 ipf_nat6_addmap(softn, n); 1479 break; 1480 #endif 1481 default : 1482 break; 1483 } 1484 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map); 1485 } 1486 1487 if (n->in_age[0] != 0) 1488 n->in_tqehead[0] = ipf_addtimeoutqueue(softc, 1489 &softn->ipf_nat_utqe, 1490 n->in_age[0]); 1491 1492 if (n->in_age[1] != 0) 1493 n->in_tqehead[1] = ipf_addtimeoutqueue(softc, 1494 &softn->ipf_nat_utqe, 1495 n->in_age[1]); 1496 1497 MUTEX_INIT(&n->in_lock, "ipnat rule lock"); 1498 1499 n = NULL; 1500 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 1501 #if SOLARIS && !defined(INSTANCES) 1502 pfil_delayed_copy = 0; 1503 #endif 1504 if (getlock) { 1505 RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */ 1506 } 1507 1508 return error; 1509 } 1510 1511 1512 /* ------------------------------------------------------------------------ */ 1513 /* Function: ipf_nat_ruleaddrinit */ 1514 /* Parameters: softc(I) - pointer to soft context main structure */ 1515 /* softn(I) - pointer to NAT context structure */ 1516 /* n(I) - pointer to NAT rule */ 1517 /* */ 1518 /* Initialise all of the NAT address structures in a NAT rule. */ 1519 /* ------------------------------------------------------------------------ */ 1520 static int 1521 ipf_nat_ruleaddrinit(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, 1522 ipnat_t *n) 1523 { 1524 int idx, error; 1525 1526 if ((n->in_ndst.na_atype == FRI_LOOKUP) && 1527 (n->in_ndst.na_type != IPLT_DSTLIST)) { 1528 IPFERROR(60071); 1529 return EINVAL; 1530 } 1531 if ((n->in_nsrc.na_atype == FRI_LOOKUP) && 1532 (n->in_nsrc.na_type != IPLT_DSTLIST)) { 1533 IPFERROR(60069); 1534 return EINVAL; 1535 } 1536 1537 if (n->in_redir == NAT_BIMAP) { 1538 n->in_ndstaddr = n->in_osrcaddr; 1539 n->in_ndstmsk = n->in_osrcmsk; 1540 n->in_odstaddr = n->in_nsrcaddr; 1541 n->in_odstmsk = n->in_nsrcmsk; 1542 1543 } 1544 1545 if (n->in_redir & NAT_REDIRECT) 1546 idx = 1; 1547 else 1548 idx = 0; 1549 /* 1550 * Initialise all of the address fields. 1551 */ 1552 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1, 1553 n->in_ifps[idx]); 1554 if (error != 0) 1555 return error; 1556 1557 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1, 1558 n->in_ifps[idx]); 1559 if (error != 0) 1560 return error; 1561 1562 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1, 1563 n->in_ifps[idx]); 1564 if (error != 0) 1565 return error; 1566 1567 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1, 1568 n->in_ifps[idx]); 1569 if (error != 0) 1570 return error; 1571 1572 if (n->in_redir & NAT_DIVERTUDP) 1573 ipf_nat_builddivertmp(softn, n); 1574 1575 return 0; 1576 } 1577 1578 1579 /* ------------------------------------------------------------------------ */ 1580 /* Function: ipf_nat_resolvrule */ 1581 /* Returns: Nil */ 1582 /* Parameters: softc(I) - pointer to soft context main structure */ 1583 /* n(I) - pointer to NAT rule */ 1584 /* */ 1585 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1586 /* from information passed to the kernel, then add it to the appropriate */ 1587 /* NAT rule table(s). */ 1588 /* ------------------------------------------------------------------------ */ 1589 static int 1590 ipf_nat_resolverule(ipf_main_softc_t *softc, ipnat_t *n) 1591 { 1592 char *base; 1593 1594 base = n->in_names; 1595 1596 n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0], 1597 n->in_v[0]); 1598 1599 if (n->in_ifnames[1] == -1) { 1600 n->in_ifnames[1] = n->in_ifnames[0]; 1601 n->in_ifps[1] = n->in_ifps[0]; 1602 } else { 1603 n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1], 1604 n->in_v[1]); 1605 } 1606 1607 if (n->in_plabel != -1) { 1608 if (n->in_redir & NAT_REDIRECT) 1609 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1610 n->in_pr[0], 1611 base + n->in_plabel); 1612 else 1613 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1614 n->in_pr[1], 1615 base + n->in_plabel); 1616 if (n->in_apr == NULL) 1617 return -1; 1618 } 1619 return 0; 1620 } 1621 1622 1623 /* ------------------------------------------------------------------------ */ 1624 /* Function: ipf_nat_siocdelnat */ 1625 /* Returns: int - 0 == success, != 0 == failure */ 1626 /* Parameters: softc(I) - pointer to soft context main structure */ 1627 /* softn(I) - pointer to NAT context structure */ 1628 /* n(I) - pointer to new NAT rule */ 1629 /* getlock(I) - flag indicating if lock on is held */ 1630 /* Mutex Locks: ipf_nat_io */ 1631 /* */ 1632 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1633 /* from information passed to the kernel, then add it to the appropriate */ 1634 /* NAT rule table(s). */ 1635 /* ------------------------------------------------------------------------ */ 1636 static void 1637 ipf_nat_siocdelnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, 1638 int getlock) 1639 { 1640 #ifdef IPF_NAT6 1641 int i; 1642 #endif 1643 1644 if (getlock) { 1645 WRITE_ENTER(&softc->ipf_nat); 1646 } 1647 1648 ipf_nat_delrule(softc, softn, n, 1); 1649 1650 if (getlock) { 1651 RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */ 1652 } 1653 } 1654 1655 1656 /* ------------------------------------------------------------------------ */ 1657 /* Function: ipf_nat_getsz */ 1658 /* Returns: int - 0 == success, != 0 is the error value. */ 1659 /* Parameters: softc(I) - pointer to soft context main structure */ 1660 /* data(I) - pointer to natget structure with kernel */ 1661 /* pointer get the size of. */ 1662 /* getlock(I) - flag indicating whether or not the caller */ 1663 /* holds a lock on ipf_nat */ 1664 /* */ 1665 /* Handle SIOCSTGSZ. */ 1666 /* Return the size of the nat list entry to be copied back to user space. */ 1667 /* The size of the entry is stored in the ng_sz field and the enture natget */ 1668 /* structure is copied back to the user. */ 1669 /* ------------------------------------------------------------------------ */ 1670 static int 1671 ipf_nat_getsz(ipf_main_softc_t *softc, void *data, int getlock) 1672 { 1673 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1674 ap_session_t *aps; 1675 nat_t *nat, *n; 1676 natget_t ng; 1677 int error; 1678 1679 error = BCOPYIN(data, &ng, sizeof(ng)); 1680 if (error != 0) { 1681 IPFERROR(60024); 1682 return EFAULT; 1683 } 1684 1685 if (getlock) { 1686 READ_ENTER(&softc->ipf_nat); 1687 } 1688 1689 nat = ng.ng_ptr; 1690 if (!nat) { 1691 nat = softn->ipf_nat_instances; 1692 ng.ng_sz = 0; 1693 /* 1694 * Empty list so the size returned is 0. Simple. 1695 */ 1696 if (nat == NULL) { 1697 if (getlock) { 1698 RWLOCK_EXIT(&softc->ipf_nat); 1699 } 1700 error = BCOPYOUT(&ng, data, sizeof(ng)); 1701 if (error != 0) { 1702 IPFERROR(60025); 1703 return EFAULT; 1704 } 1705 return 0; 1706 } 1707 } else { 1708 /* 1709 * Make sure the pointer we're copying from exists in the 1710 * current list of entries. Security precaution to prevent 1711 * copying of random kernel data. 1712 */ 1713 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1714 if (n == nat) 1715 break; 1716 if (n == NULL) { 1717 if (getlock) { 1718 RWLOCK_EXIT(&softc->ipf_nat); 1719 } 1720 IPFERROR(60026); 1721 return ESRCH; 1722 } 1723 } 1724 1725 /* 1726 * Incluse any space required for proxy data structures. 1727 */ 1728 ng.ng_sz = sizeof(nat_save_t); 1729 aps = nat->nat_aps; 1730 if (aps != NULL) { 1731 ng.ng_sz += sizeof(ap_session_t) - 4; 1732 if (aps->aps_data != 0) 1733 ng.ng_sz += aps->aps_psiz; 1734 } 1735 if (getlock) { 1736 RWLOCK_EXIT(&softc->ipf_nat); 1737 } 1738 1739 error = BCOPYOUT(&ng, data, sizeof(ng)); 1740 if (error != 0) { 1741 IPFERROR(60027); 1742 return EFAULT; 1743 } 1744 return 0; 1745 } 1746 1747 1748 /* ------------------------------------------------------------------------ */ 1749 /* Function: ipf_nat_getent */ 1750 /* Returns: int - 0 == success, != 0 is the error value. */ 1751 /* Parameters: softc(I) - pointer to soft context main structure */ 1752 /* data(I) - pointer to natget structure with kernel pointer*/ 1753 /* to NAT structure to copy out. */ 1754 /* getlock(I) - flag indicating whether or not the caller */ 1755 /* holds a lock on ipf_nat */ 1756 /* */ 1757 /* Handle SIOCSTGET. */ 1758 /* Copies out NAT entry to user space. Any additional data held for a */ 1759 /* proxy is also copied, as to is the NAT rule which was responsible for it */ 1760 /* ------------------------------------------------------------------------ */ 1761 static int 1762 ipf_nat_getent(ipf_main_softc_t *softc, void *data, int getlock) 1763 { 1764 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1765 int error, outsize; 1766 ap_session_t *aps; 1767 nat_save_t *ipn, ipns; 1768 nat_t *n, *nat; 1769 1770 error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE); 1771 if (error != 0) 1772 return error; 1773 1774 if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) { 1775 IPFERROR(60028); 1776 return EINVAL; 1777 } 1778 1779 KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize); 1780 if (ipn == NULL) { 1781 IPFERROR(60029); 1782 return ENOMEM; 1783 } 1784 1785 if (getlock) { 1786 READ_ENTER(&softc->ipf_nat); 1787 } 1788 1789 ipn->ipn_dsize = ipns.ipn_dsize; 1790 nat = ipns.ipn_next; 1791 if (nat == NULL) { 1792 nat = softn->ipf_nat_instances; 1793 if (nat == NULL) { 1794 if (softn->ipf_nat_instances == NULL) { 1795 IPFERROR(60030); 1796 error = ENOENT; 1797 } 1798 goto finished; 1799 } 1800 } else { 1801 /* 1802 * Make sure the pointer we're copying from exists in the 1803 * current list of entries. Security precaution to prevent 1804 * copying of random kernel data. 1805 */ 1806 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1807 if (n == nat) 1808 break; 1809 if (n == NULL) { 1810 IPFERROR(60031); 1811 error = ESRCH; 1812 goto finished; 1813 } 1814 } 1815 ipn->ipn_next = nat->nat_next; 1816 1817 /* 1818 * Copy the NAT structure. 1819 */ 1820 bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat)); 1821 1822 /* 1823 * If we have a pointer to the NAT rule it belongs to, save that too. 1824 */ 1825 if (nat->nat_ptr != NULL) 1826 bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat, 1827 ipn->ipn_ipnat.in_size); 1828 1829 /* 1830 * If we also know the NAT entry has an associated filter rule, 1831 * save that too. 1832 */ 1833 if (nat->nat_fr != NULL) 1834 bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr, 1835 sizeof(ipn->ipn_fr)); 1836 1837 /* 1838 * Last but not least, if there is an application proxy session set 1839 * up for this NAT entry, then copy that out too, including any 1840 * private data saved along side it by the proxy. 1841 */ 1842 aps = nat->nat_aps; 1843 outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data); 1844 if (aps != NULL) { 1845 char *s; 1846 1847 if (outsize < sizeof(*aps)) { 1848 IPFERROR(60032); 1849 error = ENOBUFS; 1850 goto finished; 1851 } 1852 1853 s = ipn->ipn_data; 1854 bcopy((char *)aps, s, sizeof(*aps)); 1855 s += sizeof(*aps); 1856 outsize -= sizeof(*aps); 1857 if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz)) 1858 bcopy(aps->aps_data, s, aps->aps_psiz); 1859 else { 1860 IPFERROR(60033); 1861 error = ENOBUFS; 1862 } 1863 } 1864 if (error == 0) { 1865 if (getlock) { 1866 READ_ENTER(&softc->ipf_nat); 1867 getlock = 0; 1868 } 1869 error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE, 1870 ipns.ipn_dsize); 1871 } 1872 1873 finished: 1874 if (getlock) { 1875 READ_ENTER(&softc->ipf_nat); 1876 } 1877 if (ipn != NULL) { 1878 KFREES(ipn, ipns.ipn_dsize); 1879 } 1880 return error; 1881 } 1882 1883 1884 /* ------------------------------------------------------------------------ */ 1885 /* Function: ipf_nat_putent */ 1886 /* Returns: int - 0 == success, != 0 is the error value. */ 1887 /* Parameters: softc(I) - pointer to soft context main structure */ 1888 /* data(I) - pointer to natget structure with NAT */ 1889 /* structure information to load into the kernel */ 1890 /* getlock(I) - flag indicating whether or not a write lock */ 1891 /* on is already held. */ 1892 /* */ 1893 /* Handle SIOCSTPUT. */ 1894 /* Loads a NAT table entry from user space, including a NAT rule, proxy and */ 1895 /* firewall rule data structures, if pointers to them indicate so. */ 1896 /* ------------------------------------------------------------------------ */ 1897 static int 1898 ipf_nat_putent(ipf_main_softc_t *softc, void *data, int getlock) 1899 { 1900 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1901 nat_save_t *ipn, *ipnn; 1902 ap_session_t *aps; 1903 nat_t *n, *nat; 1904 frentry_t *fr; 1905 fr_info_t *fin; 1906 ipnat_t *in; 1907 int error; 1908 1909 KMALLOC(ipn, nat_save_t *); 1910 if (ipn == NULL) 1911 return ENOMEM; 1912 error = ipf_inobj(softc, data, NULL, ipn, IPFOBJ_NATSAVE); 1913 if (error != 0) 1914 return error; 1915 1916 /* 1917 * Initialise early because of code at junkput label. 1918 */ 1919 n = NULL; 1920 in = NULL; 1921 aps = NULL; 1922 nat = NULL; 1923 ipnn = NULL; 1924 fin = NULL; 1925 fr = NULL; 1926 1927 /* 1928 * New entry, copy in the rest of the NAT entry if it's size is more 1929 * than just the nat_t structure. 1930 */ 1931 if (ipn->ipn_dsize > sizeof(*ipn)) { 1932 if (ipn->ipn_dsize > 81920) { 1933 IPFERROR(60034); 1934 error = ENOMEM; 1935 goto junkput; 1936 } 1937 1938 KMALLOCS(ipnn, nat_save_t *, ipn->ipn_dsize); 1939 if (ipnn == NULL) { 1940 IPFERROR(60035); 1941 return ENOMEM; 1942 } 1943 1944 bzero(ipnn, ipn->ipn_dsize); 1945 error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE, 1946 ipn->ipn_dsize); 1947 if (error != 0) { 1948 goto junkput; 1949 } 1950 } else 1951 ipnn = ipn; 1952 1953 KMALLOC(nat, nat_t *); 1954 if (nat == NULL) { 1955 IPFERROR(60037); 1956 error = ENOMEM; 1957 goto junkput; 1958 } 1959 1960 bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat)); 1961 1962 switch (nat->nat_v[0]) 1963 { 1964 case 4: 1965 #ifdef USE_IENT6 1966 case 6 : 1967 #endif 1968 break; 1969 default : 1970 IPFERROR(60061); 1971 error = EPROTONOSUPPORT; 1972 goto junkput; 1973 /*NOTREACHED*/ 1974 } 1975 1976 /* 1977 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 1978 */ 1979 bzero((char *)nat, offsetof(struct nat, nat_tqe)); 1980 nat->nat_tqe.tqe_pnext = NULL; 1981 nat->nat_tqe.tqe_next = NULL; 1982 nat->nat_tqe.tqe_ifq = NULL; 1983 nat->nat_tqe.tqe_parent = nat; 1984 1985 /* 1986 * Restore the rule associated with this nat session 1987 */ 1988 in = ipnn->ipn_nat.nat_ptr; 1989 if (in != NULL) { 1990 KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size); 1991 nat->nat_ptr = in; 1992 if (in == NULL) { 1993 IPFERROR(60038); 1994 error = ENOMEM; 1995 goto junkput; 1996 } 1997 bcopy((char *)&ipnn->ipn_ipnat, (char *)in, 1998 ipnn->ipn_ipnat.in_size); 1999 in->in_use = 1; 2000 in->in_flags |= IPN_DELETE; 2001 2002 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 2003 2004 if (ipf_nat_resolverule(softc, in) != 0) { 2005 IPFERROR(60039); 2006 error = ESRCH; 2007 goto junkput; 2008 } 2009 } 2010 2011 /* 2012 * Check that the NAT entry doesn't already exist in the kernel. 2013 * 2014 * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do 2015 * this, we check to see if the inbound combination of addresses and 2016 * ports is already known. Similar logic is applied for NAT_INBOUND. 2017 * 2018 */ 2019 KMALLOC(fin, fr_info_t *); 2020 if (fin == NULL) { 2021 error = ENOMEM; 2022 goto junkput; 2023 } 2024 bzero(fin, sizeof(*fin)); 2025 fin->fin_v = nat->nat_v[0]; 2026 fin->fin_p = nat->nat_pr[0]; 2027 fin->fin_rev = nat->nat_rev; 2028 fin->fin_ifp = nat->nat_ifps[0]; 2029 fin->fin_data[0] = ntohs(nat->nat_ndport); 2030 fin->fin_data[1] = ntohs(nat->nat_nsport); 2031 2032 switch (nat->nat_dir) 2033 { 2034 case NAT_OUTBOUND : 2035 case NAT_DIVERTOUT : 2036 if (getlock) { 2037 READ_ENTER(&softc->ipf_nat); 2038 } 2039 2040 fin->fin_v = nat->nat_v[1]; 2041 if (nat->nat_v[1] == 4) { 2042 n = ipf_nat_inlookup(fin, nat->nat_flags, fin->fin_p, 2043 nat->nat_ndstip, nat->nat_nsrcip); 2044 #ifdef USE_INET6 2045 } else if (nat->nat_v[1] == 6) { 2046 n = ipf_nat6_inlookup(fin, nat->nat_flags, fin->fin_p, 2047 &nat->nat_ndst6.in6, 2048 &nat->nat_nsrc6.in6); 2049 #endif 2050 } 2051 2052 if (getlock) { 2053 RWLOCK_EXIT(&softc->ipf_nat); 2054 } 2055 if (n != NULL) { 2056 IPFERROR(60040); 2057 error = EEXIST; 2058 goto junkput; 2059 } 2060 break; 2061 2062 case NAT_INBOUND : 2063 case NAT_DIVERTIN : 2064 if (getlock) { 2065 READ_ENTER(&softc->ipf_nat); 2066 } 2067 2068 if (fin->fin_v == 4) { 2069 n = ipf_nat_outlookup(fin, nat->nat_flags, fin->fin_p, 2070 nat->nat_ndstip, 2071 nat->nat_nsrcip); 2072 #ifdef USE_INET6 2073 } else if (fin->fin_v == 6) { 2074 n = ipf_nat6_outlookup(fin, nat->nat_flags, fin->fin_p, 2075 &nat->nat_ndst6.in6, 2076 &nat->nat_nsrc6.in6); 2077 #endif 2078 } 2079 2080 if (getlock) { 2081 RWLOCK_EXIT(&softc->ipf_nat); 2082 } 2083 if (n != NULL) { 2084 IPFERROR(60041); 2085 error = EEXIST; 2086 goto junkput; 2087 } 2088 break; 2089 2090 default : 2091 IPFERROR(60042); 2092 error = EINVAL; 2093 goto junkput; 2094 } 2095 2096 /* 2097 * Restore ap_session_t structure. Include the private data allocated 2098 * if it was there. 2099 */ 2100 aps = nat->nat_aps; 2101 if (aps != NULL) { 2102 KMALLOC(aps, ap_session_t *); 2103 nat->nat_aps = aps; 2104 if (aps == NULL) { 2105 IPFERROR(60043); 2106 error = ENOMEM; 2107 goto junkput; 2108 } 2109 bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps)); 2110 if (in != NULL) 2111 aps->aps_apr = in->in_apr; 2112 else 2113 aps->aps_apr = NULL; 2114 if (aps->aps_psiz != 0) { 2115 if (aps->aps_psiz > 81920) { 2116 IPFERROR(60044); 2117 error = ENOMEM; 2118 goto junkput; 2119 } 2120 KMALLOCS(aps->aps_data, void *, aps->aps_psiz); 2121 if (aps->aps_data == NULL) { 2122 IPFERROR(60045); 2123 error = ENOMEM; 2124 goto junkput; 2125 } 2126 bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data, 2127 aps->aps_psiz); 2128 } else { 2129 aps->aps_psiz = 0; 2130 aps->aps_data = NULL; 2131 } 2132 } 2133 2134 /* 2135 * If there was a filtering rule associated with this entry then 2136 * build up a new one. 2137 */ 2138 fr = nat->nat_fr; 2139 if (fr != NULL) { 2140 if ((nat->nat_flags & SI_NEWFR) != 0) { 2141 KMALLOC(fr, frentry_t *); 2142 nat->nat_fr = fr; 2143 if (fr == NULL) { 2144 IPFERROR(60046); 2145 error = ENOMEM; 2146 goto junkput; 2147 } 2148 ipnn->ipn_nat.nat_fr = fr; 2149 fr->fr_ref = 1; 2150 (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE); 2151 bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr)); 2152 2153 fr->fr_ref = 1; 2154 fr->fr_dsize = 0; 2155 fr->fr_data = NULL; 2156 fr->fr_type = FR_T_NONE; 2157 2158 MUTEX_NUKE(&fr->fr_lock); 2159 MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock"); 2160 } else { 2161 if (getlock) { 2162 READ_ENTER(&softc->ipf_nat); 2163 } 2164 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 2165 if (n->nat_fr == fr) 2166 break; 2167 2168 if (n != NULL) { 2169 MUTEX_ENTER(&fr->fr_lock); 2170 fr->fr_ref++; 2171 MUTEX_EXIT(&fr->fr_lock); 2172 } 2173 if (getlock) { 2174 RWLOCK_EXIT(&softc->ipf_nat); 2175 } 2176 2177 if (n == NULL) { 2178 IPFERROR(60047); 2179 error = ESRCH; 2180 goto junkput; 2181 } 2182 } 2183 } 2184 2185 if (ipnn != ipn) { 2186 KFREES(ipnn, ipn->ipn_dsize); 2187 ipnn = NULL; 2188 } 2189 2190 if (getlock) { 2191 WRITE_ENTER(&softc->ipf_nat); 2192 } 2193 2194 if (fin->fin_v == 4) 2195 error = ipf_nat_finalise(fin, nat); 2196 #ifdef USE_INET6 2197 else 2198 error = ipf_nat6_finalise(fin, nat); 2199 #endif 2200 2201 if (getlock) { 2202 RWLOCK_EXIT(&softc->ipf_nat); 2203 } 2204 2205 if (error == 0) 2206 return 0; 2207 2208 IPFERROR(60048); 2209 error = ENOMEM; 2210 2211 junkput: 2212 if (fin != NULL) 2213 KFREE(fin); 2214 if (fr != NULL) { 2215 (void) ipf_derefrule(softc, &fr); 2216 } 2217 2218 if ((ipnn != NULL) && (ipnn != ipn)) { 2219 KFREES(ipnn, ipn->ipn_dsize); 2220 } 2221 if (ipn != NULL) 2222 KFREE(ipn); 2223 if (nat != NULL) { 2224 if (aps != NULL) { 2225 if (aps->aps_data != NULL) { 2226 KFREES(aps->aps_data, aps->aps_psiz); 2227 } 2228 KFREE(aps); 2229 } 2230 if (in != NULL) { 2231 if (in->in_apr) 2232 ipf_proxy_deref(in->in_apr); 2233 KFREES(in, in->in_size); 2234 } 2235 KFREE(nat); 2236 } 2237 return error; 2238 } 2239 2240 2241 /* ------------------------------------------------------------------------ */ 2242 /* Function: ipf_nat_delete */ 2243 /* Returns: Nil */ 2244 /* Parameters: softc(I) - pointer to soft context main structure */ 2245 /* nat(I) - pointer to NAT structure to delete */ 2246 /* logtype(I) - type of LOG record to create before deleting */ 2247 /* Write Lock: ipf_nat */ 2248 /* */ 2249 /* Delete a nat entry from the various lists and table. If NAT logging is */ 2250 /* enabled then generate a NAT log record for this event. */ 2251 /* ------------------------------------------------------------------------ */ 2252 void 2253 ipf_nat_delete(ipf_main_softc_t *softc, struct nat *nat, int logtype) 2254 { 2255 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2256 int madeorphan = 0, removed = 0; 2257 u_int bkt; 2258 nat_stat_side_t *nss; 2259 struct ipnat *ipn; 2260 2261 if (logtype != 0 && softn->ipf_nat_logging != 0) 2262 ipf_nat_log(softc, softn, nat, logtype); 2263 2264 /* 2265 * Take it as a general indication that all the pointers are set if 2266 * nat_pnext is set. 2267 */ 2268 if (nat->nat_pnext != NULL) { 2269 removed = 1; 2270 2271 bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz; 2272 nss = &softn->ipf_nat_stats.ns_side[0]; 2273 ASSERT(nss->ns_bucketlen[bkt] > 0); 2274 nss->ns_bucketlen[bkt]--; 2275 if (nss->ns_bucketlen[bkt] == 0) { 2276 nss->ns_inuse--; 2277 } 2278 2279 bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz; 2280 nss = &softn->ipf_nat_stats.ns_side[1]; 2281 ASSERT(nss->ns_bucketlen[bkt] > 0); 2282 nss->ns_bucketlen[bkt]--; 2283 if (nss->ns_bucketlen[bkt] == 0) { 2284 nss->ns_inuse--; 2285 } 2286 2287 *nat->nat_pnext = nat->nat_next; 2288 if (nat->nat_next != NULL) { 2289 nat->nat_next->nat_pnext = nat->nat_pnext; 2290 nat->nat_next = NULL; 2291 } 2292 nat->nat_pnext = NULL; 2293 2294 *nat->nat_phnext[0] = nat->nat_hnext[0]; 2295 if (nat->nat_hnext[0] != NULL) { 2296 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 2297 nat->nat_hnext[0] = NULL; 2298 } 2299 nat->nat_phnext[0] = NULL; 2300 2301 *nat->nat_phnext[1] = nat->nat_hnext[1]; 2302 if (nat->nat_hnext[1] != NULL) { 2303 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 2304 nat->nat_hnext[1] = NULL; 2305 } 2306 nat->nat_phnext[1] = NULL; 2307 2308 if ((nat->nat_flags & SI_WILDP) != 0) { 2309 ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds); 2310 } 2311 madeorphan = 1; 2312 } 2313 2314 if (nat->nat_me != NULL) { 2315 *nat->nat_me = NULL; 2316 nat->nat_me = NULL; 2317 nat->nat_ref--; 2318 ASSERT(nat->nat_ref >= 0); 2319 } 2320 2321 if (nat->nat_tqe.tqe_ifq != NULL) { 2322 /* 2323 * No call to ipf_freetimeoutqueue() is made here, they are 2324 * garbage collected in ipf_nat_expire(). 2325 */ 2326 (void) ipf_deletequeueentry(&nat->nat_tqe); 2327 } 2328 2329 if (nat->nat_sync) { 2330 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 2331 nat->nat_sync = NULL; 2332 } 2333 2334 if (logtype == NL_EXPIRE) 2335 softn->ipf_nat_stats.ns_expire++; 2336 2337 MUTEX_ENTER(&nat->nat_lock); 2338 /* 2339 * NL_DESTROY should only be passed in when we've got nat_ref >= 2. 2340 * This happens when a nat'd packet is blocked and we want to throw 2341 * away the NAT session. 2342 */ 2343 if (logtype == NL_DESTROY) { 2344 if (nat->nat_ref > 2) { 2345 nat->nat_ref -= 2; 2346 MUTEX_EXIT(&nat->nat_lock); 2347 if (removed) 2348 softn->ipf_nat_stats.ns_orphans++; 2349 return; 2350 } 2351 } else if (nat->nat_ref > 1) { 2352 nat->nat_ref--; 2353 MUTEX_EXIT(&nat->nat_lock); 2354 if (madeorphan == 1) 2355 softn->ipf_nat_stats.ns_orphans++; 2356 return; 2357 } 2358 ASSERT(nat->nat_ref >= 0); 2359 MUTEX_EXIT(&nat->nat_lock); 2360 2361 nat->nat_ref = 0; 2362 2363 if (madeorphan == 0) 2364 softn->ipf_nat_stats.ns_orphans--; 2365 2366 /* 2367 * At this point, nat_ref can be either 0 or -1 2368 */ 2369 softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--; 2370 2371 if (nat->nat_fr != NULL) { 2372 (void) ipf_derefrule(softc, &nat->nat_fr); 2373 } 2374 2375 if (nat->nat_hm != NULL) { 2376 ipf_nat_hostmapdel(softc, &nat->nat_hm); 2377 } 2378 2379 /* 2380 * If there is an active reference from the nat entry to its parent 2381 * rule, decrement the rule's reference count and free it too if no 2382 * longer being used. 2383 */ 2384 ipn = nat->nat_ptr; 2385 nat->nat_ptr = NULL; 2386 2387 if (ipn != NULL) { 2388 ipn->in_space++; 2389 ipf_nat_rule_deref(softc, &ipn); 2390 } 2391 2392 if (nat->nat_aps != NULL) { 2393 ipf_proxy_free(softc, nat->nat_aps); 2394 nat->nat_aps = NULL; 2395 } 2396 2397 MUTEX_DESTROY(&nat->nat_lock); 2398 2399 softn->ipf_nat_stats.ns_active--; 2400 2401 /* 2402 * If there's a fragment table entry too for this nat entry, then 2403 * dereference that as well. This is after nat_lock is released 2404 * because of Tru64. 2405 */ 2406 ipf_frag_natforget(softc, (void *)nat); 2407 2408 KFREE(nat); 2409 } 2410 2411 2412 /* ------------------------------------------------------------------------ */ 2413 /* Function: ipf_nat_flushtable */ 2414 /* Returns: int - number of NAT rules deleted */ 2415 /* Parameters: softc(I) - pointer to soft context main structure */ 2416 /* softn(I) - pointer to NAT context structure */ 2417 /* Write Lock: ipf_nat */ 2418 /* */ 2419 /* Deletes all currently active NAT sessions. In deleting each NAT entry a */ 2420 /* log record should be emitted in ipf_nat_delete() if NAT logging is */ 2421 /* enabled. */ 2422 /* ------------------------------------------------------------------------ */ 2423 /* 2424 * nat_flushtable - clear the NAT table of all mapping entries. 2425 */ 2426 static int 2427 ipf_nat_flushtable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) 2428 { 2429 nat_t *nat; 2430 int j = 0; 2431 2432 /* 2433 * ALL NAT mappings deleted, so lets just make the deletions 2434 * quicker. 2435 */ 2436 if (softn->ipf_nat_table[0] != NULL) 2437 bzero((char *)softn->ipf_nat_table[0], 2438 sizeof(softn->ipf_nat_table[0]) * 2439 softn->ipf_nat_table_sz); 2440 if (softn->ipf_nat_table[1] != NULL) 2441 bzero((char *)softn->ipf_nat_table[1], 2442 sizeof(softn->ipf_nat_table[1]) * 2443 softn->ipf_nat_table_sz); 2444 2445 while ((nat = softn->ipf_nat_instances) != NULL) { 2446 ipf_nat_delete(softc, nat, NL_FLUSH); 2447 j++; 2448 } 2449 2450 return j; 2451 } 2452 2453 2454 /* ------------------------------------------------------------------------ */ 2455 /* Function: ipf_nat_clearlist */ 2456 /* Returns: int - number of NAT/RDR rules deleted */ 2457 /* Parameters: softc(I) - pointer to soft context main structure */ 2458 /* softn(I) - pointer to NAT context structure */ 2459 /* */ 2460 /* Delete all rules in the current list of rules. There is nothing elegant */ 2461 /* about this cleanup: simply free all entries on the list of rules and */ 2462 /* clear out the tables used for hashed NAT rule lookups. */ 2463 /* ------------------------------------------------------------------------ */ 2464 static int 2465 ipf_nat_clearlist(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) 2466 { 2467 ipnat_t *n; 2468 int i = 0; 2469 2470 if (softn->ipf_nat_map_rules != NULL) { 2471 bzero((char *)softn->ipf_nat_map_rules, 2472 sizeof(*softn->ipf_nat_map_rules) * 2473 softn->ipf_nat_maprules_sz); 2474 } 2475 if (softn->ipf_nat_rdr_rules != NULL) { 2476 bzero((char *)softn->ipf_nat_rdr_rules, 2477 sizeof(*softn->ipf_nat_rdr_rules) * 2478 softn->ipf_nat_rdrrules_sz); 2479 } 2480 2481 while ((n = softn->ipf_nat_list) != NULL) { 2482 ipf_nat_delrule(softc, softn, n, 0); 2483 i++; 2484 } 2485 #if SOLARIS && !defined(INSTANCES) 2486 pfil_delayed_copy = 1; 2487 #endif 2488 return i; 2489 } 2490 2491 2492 /* ------------------------------------------------------------------------ */ 2493 /* Function: ipf_nat_delrule */ 2494 /* Returns: Nil */ 2495 /* Parameters: softc(I) - pointer to soft context main structure */ 2496 /* softn(I) - pointer to NAT context structure */ 2497 /* np(I) - pointer to NAT rule to delete */ 2498 /* purge(I) - 1 == allow purge, 0 == prevent purge */ 2499 /* Locks: WRITE(ipf_nat) */ 2500 /* */ 2501 /* Preventing "purge" from occuring is allowed because when all of the NAT */ 2502 /* rules are being removed, allowing the "purge" to walk through the list */ 2503 /* of NAT sessions, possibly multiple times, would be a large performance */ 2504 /* hit, on the order of O(N^2). */ 2505 /* ------------------------------------------------------------------------ */ 2506 static void 2507 ipf_nat_delrule(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *np, 2508 int purge) 2509 { 2510 2511 if (np->in_pnext != NULL) { 2512 *np->in_pnext = np->in_next; 2513 if (np->in_next != NULL) 2514 np->in_next->in_pnext = np->in_pnext; 2515 if (softn->ipf_nat_list_tail == &np->in_next) 2516 softn->ipf_nat_list_tail = np->in_pnext; 2517 } 2518 2519 if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) { 2520 nat_t *next; 2521 nat_t *nat; 2522 2523 for (next = softn->ipf_nat_instances; (nat = next) != NULL;) { 2524 next = nat->nat_next; 2525 if (nat->nat_ptr == np) 2526 ipf_nat_delete(softc, nat, NL_PURGE); 2527 } 2528 } 2529 2530 if ((np->in_flags & IPN_DELETE) == 0) { 2531 if (np->in_redir & NAT_REDIRECT) { 2532 switch (np->in_v[0]) 2533 { 2534 case 4 : 2535 ipf_nat_delrdr(softn, np); 2536 break; 2537 #ifdef USE_INET6 2538 case 6 : 2539 ipf_nat6_delrdr(softn, np); 2540 break; 2541 #endif 2542 } 2543 } 2544 if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) { 2545 switch (np->in_v[0]) 2546 { 2547 case 4 : 2548 ipf_nat_delmap(softn, np); 2549 break; 2550 #ifdef USE_INET6 2551 case 6 : 2552 ipf_nat6_delmap(softn, np); 2553 break; 2554 #endif 2555 } 2556 } 2557 } 2558 2559 np->in_flags |= IPN_DELETE; 2560 ipf_nat_rule_deref(softc, &np); 2561 } 2562 2563 2564 /* ------------------------------------------------------------------------ */ 2565 /* Function: ipf_nat_newmap */ 2566 /* Returns: int - -1 == error, 0 == success */ 2567 /* Parameters: fin(I) - pointer to packet information */ 2568 /* nat(I) - pointer to NAT entry */ 2569 /* ni(I) - pointer to structure with misc. information needed */ 2570 /* to create new NAT entry. */ 2571 /* */ 2572 /* Given an empty NAT structure, populate it with new information about a */ 2573 /* new NAT session, as defined by the matching NAT rule. */ 2574 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2575 /* to the new IP address for the translation. */ 2576 /* ------------------------------------------------------------------------ */ 2577 static int 2578 ipf_nat_newmap(fr_info_t *fin, nat_t *nat, natinfo_t *ni) 2579 { 2580 ipf_main_softc_t *softc = fin->fin_main_soft; 2581 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2582 u_short st_port, dport, sport, port, sp, dp; 2583 struct in_addr in, inb; 2584 hostmap_t *hm; 2585 u_32_t flags; 2586 u_32_t st_ip; 2587 ipnat_t *np; 2588 nat_t *natl; 2589 int l; 2590 2591 /* 2592 * If it's an outbound packet which doesn't match any existing 2593 * record, then create a new port 2594 */ 2595 l = 0; 2596 hm = NULL; 2597 np = ni->nai_np; 2598 st_ip = np->in_snip; 2599 st_port = np->in_spnext; 2600 flags = nat->nat_flags; 2601 2602 if (flags & IPN_ICMPQUERY) { 2603 sport = fin->fin_data[1]; 2604 dport = 0; 2605 } else { 2606 sport = htons(fin->fin_data[0]); 2607 dport = htons(fin->fin_data[1]); 2608 } 2609 2610 /* 2611 * Do a loop until we either run out of entries to try or we find 2612 * a NAT mapping that isn't currently being used. This is done 2613 * because the change to the source is not (usually) being fixed. 2614 */ 2615 do { 2616 port = 0; 2617 in.s_addr = htonl(np->in_snip); 2618 if (l == 0) { 2619 /* 2620 * Check to see if there is an existing NAT 2621 * setup for this IP address pair. 2622 */ 2623 hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2624 fin->fin_dst, in, 0); 2625 if (hm != NULL) 2626 in.s_addr = hm->hm_nsrcip.s_addr; 2627 } else if ((l == 1) && (hm != NULL)) { 2628 ipf_nat_hostmapdel(softc, &hm); 2629 } 2630 in.s_addr = ntohl(in.s_addr); 2631 2632 nat->nat_hm = hm; 2633 2634 if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) { 2635 if (l > 0) { 2636 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1); 2637 return -1; 2638 } 2639 } 2640 2641 if (np->in_redir == NAT_BIMAP && 2642 np->in_osrcmsk == np->in_nsrcmsk) { 2643 /* 2644 * map the address block in a 1:1 fashion 2645 */ 2646 in.s_addr = np->in_nsrcaddr; 2647 in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk; 2648 in.s_addr = ntohl(in.s_addr); 2649 2650 } else if (np->in_redir & NAT_MAPBLK) { 2651 if ((l >= np->in_ppip) || ((l > 0) && 2652 !(flags & IPN_TCPUDP))) { 2653 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2); 2654 return -1; 2655 } 2656 /* 2657 * map-block - Calculate destination address. 2658 */ 2659 in.s_addr = ntohl(fin->fin_saddr); 2660 in.s_addr &= ntohl(~np->in_osrcmsk); 2661 inb.s_addr = in.s_addr; 2662 in.s_addr /= np->in_ippip; 2663 in.s_addr &= ntohl(~np->in_nsrcmsk); 2664 in.s_addr += ntohl(np->in_nsrcaddr); 2665 /* 2666 * Calculate destination port. 2667 */ 2668 if ((flags & IPN_TCPUDP) && 2669 (np->in_ppip != 0)) { 2670 port = ntohs(sport) + l; 2671 port %= np->in_ppip; 2672 port += np->in_ppip * 2673 (inb.s_addr % np->in_ippip); 2674 port += MAPBLK_MINPORT; 2675 port = htons(port); 2676 } 2677 2678 } else if ((np->in_nsrcaddr == 0) && 2679 (np->in_nsrcmsk == 0xffffffff)) { 2680 i6addr_t in6; 2681 2682 /* 2683 * 0/32 - use the interface's IP address. 2684 */ 2685 if ((l > 0) || 2686 ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2687 &in6, NULL) == -1) { 2688 NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1); 2689 return -1; 2690 } 2691 in.s_addr = ntohl(in6.in4.s_addr); 2692 2693 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 2694 /* 2695 * 0/0 - use the original source address/port. 2696 */ 2697 if (l > 0) { 2698 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3); 2699 return -1; 2700 } 2701 in.s_addr = ntohl(fin->fin_saddr); 2702 2703 } else if ((np->in_nsrcmsk != 0xffffffff) && 2704 (np->in_spnext == 0) && ((l > 0) || (hm == NULL))) 2705 np->in_snip++; 2706 2707 natl = NULL; 2708 2709 if ((flags & IPN_TCPUDP) && 2710 ((np->in_redir & NAT_MAPBLK) == 0) && 2711 (np->in_flags & IPN_AUTOPORTMAP)) { 2712 /* 2713 * "ports auto" (without map-block) 2714 */ 2715 if ((l > 0) && np->in_ppip && (l % np->in_ppip == 0)) { 2716 if (l > np->in_space) { 2717 return -1; 2718 } else if ((l > np->in_ppip) && 2719 np->in_nsrcmsk != 0xffffffff) 2720 np->in_snip++; 2721 } 2722 if (np->in_ppip != 0) { 2723 port = ntohs(sport); 2724 port += (l % np->in_ppip); 2725 port %= np->in_ppip; 2726 port += np->in_ppip * 2727 (ntohl(fin->fin_saddr) % 2728 np->in_ippip); 2729 port += MAPBLK_MINPORT; 2730 port = htons(port); 2731 } 2732 2733 } else if (((np->in_redir & NAT_MAPBLK) == 0) && 2734 (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) { 2735 /* 2736 * Standard port translation. Select next port. 2737 */ 2738 if (np->in_flags & IPN_SEQUENTIAL) { 2739 port = np->in_spnext; 2740 } else { 2741 port = ipf_random() % (np->in_spmax - 2742 np->in_spmin + 1); 2743 port += np->in_spmin; 2744 } 2745 port = htons(port); 2746 np->in_spnext++; 2747 2748 if (np->in_spnext > np->in_spmax) { 2749 np->in_spnext = np->in_spmin; 2750 if (np->in_nsrcmsk != 0xffffffff) 2751 np->in_snip++; 2752 } 2753 } 2754 2755 if (np->in_flags & IPN_SIPRANGE) { 2756 if (np->in_snip > ntohl(np->in_nsrcmsk)) 2757 np->in_snip = ntohl(np->in_nsrcaddr); 2758 } else { 2759 if ((np->in_nsrcmsk != 0xffffffff) && 2760 ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) > 2761 ntohl(np->in_nsrcaddr)) 2762 np->in_snip = ntohl(np->in_nsrcaddr) + 1; 2763 } 2764 2765 if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY))) 2766 port = sport; 2767 2768 /* 2769 * Here we do a lookup of the connection as seen from 2770 * the outside. If an IP# pair already exists, try 2771 * again. So if you have A->B becomes C->B, you can 2772 * also have D->E become C->E but not D->B causing 2773 * another C->B. Also take protocol and ports into 2774 * account when determining whether a pre-existing 2775 * NAT setup will cause an external conflict where 2776 * this is appropriate. 2777 */ 2778 inb.s_addr = htonl(in.s_addr); 2779 sp = fin->fin_data[0]; 2780 dp = fin->fin_data[1]; 2781 fin->fin_data[0] = fin->fin_data[1]; 2782 fin->fin_data[1] = ntohs(port); 2783 natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 2784 (u_int)fin->fin_p, fin->fin_dst, inb); 2785 fin->fin_data[0] = sp; 2786 fin->fin_data[1] = dp; 2787 2788 /* 2789 * Has the search wrapped around and come back to the 2790 * start ? 2791 */ 2792 if ((natl != NULL) && 2793 (np->in_spnext != 0) && (st_port == np->in_spnext) && 2794 (np->in_snip != 0) && (st_ip == np->in_snip)) { 2795 NBUMPSIDED(1, ns_wrap); 2796 return -1; 2797 } 2798 l++; 2799 } while (natl != NULL); 2800 2801 /* Setup the NAT table */ 2802 nat->nat_osrcip = fin->fin_src; 2803 nat->nat_nsrcaddr = htonl(in.s_addr); 2804 nat->nat_odstip = fin->fin_dst; 2805 nat->nat_ndstip = fin->fin_dst; 2806 if (nat->nat_hm == NULL) 2807 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2808 fin->fin_dst, nat->nat_nsrcip, 2809 0); 2810 2811 if (flags & IPN_TCPUDP) { 2812 nat->nat_osport = sport; 2813 nat->nat_nsport = port; /* sport */ 2814 nat->nat_odport = dport; 2815 nat->nat_ndport = dport; 2816 ((tcphdr_t *)fin->fin_dp)->th_sport = port; 2817 } else if (flags & IPN_ICMPQUERY) { 2818 nat->nat_oicmpid = fin->fin_data[1]; 2819 ((icmphdr_t *)fin->fin_dp)->icmp_id = port; 2820 nat->nat_nicmpid = port; 2821 } 2822 return 0; 2823 } 2824 2825 2826 /* ------------------------------------------------------------------------ */ 2827 /* Function: ipf_nat_newrdr */ 2828 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 2829 /* allow rule to be moved if IPN_ROUNDR is set. */ 2830 /* Parameters: fin(I) - pointer to packet information */ 2831 /* nat(I) - pointer to NAT entry */ 2832 /* ni(I) - pointer to structure with misc. information needed */ 2833 /* to create new NAT entry. */ 2834 /* */ 2835 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2836 /* to the new IP address for the translation. */ 2837 /* ------------------------------------------------------------------------ */ 2838 static int 2839 ipf_nat_newrdr(fr_info_t *fin, nat_t *nat, natinfo_t *ni) 2840 { 2841 ipf_main_softc_t *softc = fin->fin_main_soft; 2842 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2843 u_short nport, dport, sport; 2844 struct in_addr in, inb; 2845 u_short sp, dp; 2846 hostmap_t *hm; 2847 u_32_t flags; 2848 ipnat_t *np; 2849 nat_t *natl; 2850 int move; 2851 2852 move = 1; 2853 hm = NULL; 2854 in.s_addr = 0; 2855 np = ni->nai_np; 2856 flags = nat->nat_flags; 2857 2858 if (flags & IPN_ICMPQUERY) { 2859 dport = fin->fin_data[1]; 2860 sport = 0; 2861 } else { 2862 sport = htons(fin->fin_data[0]); 2863 dport = htons(fin->fin_data[1]); 2864 } 2865 2866 /* TRACE sport, dport */ 2867 2868 2869 /* 2870 * If the matching rule has IPN_STICKY set, then we want to have the 2871 * same rule kick in as before. Why would this happen? If you have 2872 * a collection of rdr rules with "round-robin sticky", the current 2873 * packet might match a different one to the previous connection but 2874 * we want the same destination to be used. 2875 */ 2876 if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) && 2877 ((np->in_flags & IPN_STICKY) != 0)) { 2878 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst, 2879 in, (u_32_t)dport); 2880 if (hm != NULL) { 2881 in.s_addr = ntohl(hm->hm_ndstip.s_addr); 2882 np = hm->hm_ipnat; 2883 ni->nai_np = np; 2884 move = 0; 2885 ipf_nat_hostmapdel(softc, &hm); 2886 } 2887 } 2888 2889 /* 2890 * Otherwise, it's an inbound packet. Most likely, we don't 2891 * want to rewrite source ports and source addresses. Instead, 2892 * we want to rewrite to a fixed internal address and fixed 2893 * internal port. 2894 */ 2895 if (np->in_flags & IPN_SPLIT) { 2896 in.s_addr = np->in_dnip; 2897 2898 if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) { 2899 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, 2900 fin->fin_dst, in, (u_32_t)dport); 2901 if (hm != NULL) { 2902 in.s_addr = hm->hm_ndstip.s_addr; 2903 move = 0; 2904 } 2905 } 2906 2907 if (hm == NULL || hm->hm_ref == 1) { 2908 if (np->in_ndstaddr == htonl(in.s_addr)) { 2909 np->in_dnip = ntohl(np->in_ndstmsk); 2910 move = 0; 2911 } else { 2912 np->in_dnip = ntohl(np->in_ndstaddr); 2913 } 2914 } 2915 if (hm != NULL) 2916 ipf_nat_hostmapdel(softc, &hm); 2917 2918 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 2919 i6addr_t in6; 2920 2921 /* 2922 * 0/32 - use the interface's IP address. 2923 */ 2924 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2925 &in6, NULL) == -1) { 2926 NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2); 2927 return -1; 2928 } 2929 in.s_addr = ntohl(in6.in4.s_addr); 2930 2931 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) { 2932 /* 2933 * 0/0 - use the original destination address/port. 2934 */ 2935 in.s_addr = ntohl(fin->fin_daddr); 2936 2937 } else if (np->in_redir == NAT_BIMAP && 2938 np->in_ndstmsk == np->in_odstmsk) { 2939 /* 2940 * map the address block in a 1:1 fashion 2941 */ 2942 in.s_addr = np->in_ndstaddr; 2943 in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk; 2944 in.s_addr = ntohl(in.s_addr); 2945 } else { 2946 in.s_addr = ntohl(np->in_ndstaddr); 2947 } 2948 2949 if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0)) 2950 nport = dport; 2951 else { 2952 /* 2953 * Whilst not optimized for the case where 2954 * pmin == pmax, the gain is not significant. 2955 */ 2956 if (((np->in_flags & IPN_FIXEDDPORT) == 0) && 2957 (np->in_odport != np->in_dtop)) { 2958 nport = ntohs(dport) - np->in_odport + np->in_dpmax; 2959 nport = htons(nport); 2960 } else { 2961 nport = htons(np->in_dpnext); 2962 np->in_dpnext++; 2963 if (np->in_dpnext > np->in_dpmax) 2964 np->in_dpnext = np->in_dpmin; 2965 } 2966 } 2967 2968 /* 2969 * When the redirect-to address is set to 0.0.0.0, just 2970 * assume a blank `forwarding' of the packet. We don't 2971 * setup any translation for this either. 2972 */ 2973 if (in.s_addr == 0) { 2974 if (nport == dport) { 2975 NBUMPSIDED(0, ns_xlate_null); 2976 return -1; 2977 } 2978 in.s_addr = ntohl(fin->fin_daddr); 2979 } 2980 2981 /* 2982 * Check to see if this redirect mapping already exists and if 2983 * it does, return "failure" (allowing it to be created will just 2984 * cause one or both of these "connections" to stop working.) 2985 */ 2986 inb.s_addr = htonl(in.s_addr); 2987 sp = fin->fin_data[0]; 2988 dp = fin->fin_data[1]; 2989 fin->fin_data[1] = fin->fin_data[0]; 2990 fin->fin_data[0] = ntohs(nport); 2991 natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 2992 (u_int)fin->fin_p, inb, fin->fin_src); 2993 fin->fin_data[0] = sp; 2994 fin->fin_data[1] = dp; 2995 if (natl != NULL) { 2996 DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl); 2997 NBUMPSIDE(0, ns_xlate_exists); 2998 return -1; 2999 } 3000 3001 nat->nat_ndstaddr = htonl(in.s_addr); 3002 nat->nat_odstip = fin->fin_dst; 3003 nat->nat_nsrcip = fin->fin_src; 3004 nat->nat_osrcip = fin->fin_src; 3005 if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0)) 3006 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 3007 fin->fin_dst, in, (u_32_t)dport); 3008 3009 if (flags & IPN_TCPUDP) { 3010 nat->nat_odport = dport; 3011 nat->nat_ndport = nport; 3012 nat->nat_osport = sport; 3013 nat->nat_nsport = sport; 3014 ((tcphdr_t *)fin->fin_dp)->th_dport = nport; 3015 } else if (flags & IPN_ICMPQUERY) { 3016 nat->nat_oicmpid = fin->fin_data[1]; 3017 ((icmphdr_t *)fin->fin_dp)->icmp_id = nport; 3018 nat->nat_nicmpid = nport; 3019 } 3020 3021 return move; 3022 } 3023 3024 /* ------------------------------------------------------------------------ */ 3025 /* Function: ipf_nat_add */ 3026 /* Returns: nat_t* - NULL == failure to create new NAT structure, */ 3027 /* else pointer to new NAT structure */ 3028 /* Parameters: fin(I) - pointer to packet information */ 3029 /* np(I) - pointer to NAT rule */ 3030 /* natsave(I) - pointer to where to store NAT struct pointer */ 3031 /* flags(I) - flags describing the current packet */ 3032 /* direction(I) - direction of packet (in/out) */ 3033 /* Write Lock: ipf_nat */ 3034 /* */ 3035 /* Attempts to create a new NAT entry. Does not actually change the packet */ 3036 /* in any way. */ 3037 /* */ 3038 /* This function is in three main parts: (1) deal with creating a new NAT */ 3039 /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */ 3040 /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */ 3041 /* and (3) building that structure and putting it into the NAT table(s). */ 3042 /* */ 3043 /* NOTE: natsave should NOT be used to point back to an ipstate_t struct */ 3044 /* as it can result in memory being corrupted. */ 3045 /* ------------------------------------------------------------------------ */ 3046 nat_t * 3047 ipf_nat_add(fr_info_t *fin, ipnat_t *np, nat_t **natsave, u_int flags, 3048 int direction) 3049 { 3050 ipf_main_softc_t *softc = fin->fin_main_soft; 3051 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3052 hostmap_t *hm = NULL; 3053 nat_t *nat, *natl; 3054 natstat_t *nsp; 3055 u_int nflags; 3056 natinfo_t ni; 3057 int move; 3058 3059 memset(&ni, 0, sizeof ni); /* XXX gcc */ 3060 nsp = &softn->ipf_nat_stats; 3061 3062 if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) > 3063 softn->ipf_nat_table_wm_high) { 3064 softn->ipf_nat_doflush = 1; 3065 } 3066 3067 if (nsp->ns_active >= softn->ipf_nat_table_max) { 3068 NBUMPSIDED(fin->fin_out, ns_table_max); 3069 return NULL; 3070 } 3071 3072 move = 1; 3073 nflags = np->in_flags & flags; 3074 nflags &= NAT_FROMRULE; 3075 3076 ni.nai_np = np; 3077 ni.nai_dport = 0; 3078 ni.nai_sport = 0; 3079 3080 /* Give me a new nat */ 3081 KMALLOC(nat, nat_t *); 3082 if (nat == NULL) { 3083 NBUMPSIDED(fin->fin_out, ns_memfail); 3084 /* 3085 * Try to automatically tune the max # of entries in the 3086 * table allowed to be less than what will cause kmem_alloc() 3087 * to fail and try to eliminate panics due to out of memory 3088 * conditions arising. 3089 */ 3090 if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) && 3091 (nsp->ns_active > 100)) { 3092 softn->ipf_nat_table_max = nsp->ns_active - 100; 3093 printf("table_max reduced to %d\n", 3094 softn->ipf_nat_table_max); 3095 } 3096 return NULL; 3097 } 3098 3099 if (flags & IPN_ICMPQUERY) { 3100 /* 3101 * In the ICMP query NAT code, we translate the ICMP id fields 3102 * to make them unique. This is indepedent of the ICMP type 3103 * (e.g. in the unlikely event that a host sends an echo and 3104 * an tstamp request with the same id, both packets will have 3105 * their ip address/id field changed in the same way). 3106 */ 3107 /* The icmp_id field is used by the sender to identify the 3108 * process making the icmp request. (the receiver justs 3109 * copies it back in its response). So, it closely matches 3110 * the concept of source port. We overlay sport, so we can 3111 * maximally reuse the existing code. 3112 */ 3113 ni.nai_sport = fin->fin_data[1]; 3114 ni.nai_dport = 0; 3115 } 3116 3117 bzero((char *)nat, sizeof(*nat)); 3118 nat->nat_flags = flags; 3119 nat->nat_redir = np->in_redir; 3120 nat->nat_dir = direction; 3121 nat->nat_pr[0] = fin->fin_p; 3122 nat->nat_pr[1] = fin->fin_p; 3123 3124 /* 3125 * Search the current table for a match and create a new mapping 3126 * if there is none found. 3127 */ 3128 if (np->in_redir & NAT_DIVERTUDP) { 3129 move = ipf_nat_newdivert(fin, nat, &ni); 3130 3131 } else if (np->in_redir & NAT_REWRITE) { 3132 move = ipf_nat_newrewrite(fin, nat, &ni); 3133 3134 } else if (direction == NAT_OUTBOUND) { 3135 /* 3136 * We can now arrange to call this for the same connection 3137 * because ipf_nat_new doesn't protect the code path into 3138 * this function. 3139 */ 3140 natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 3141 fin->fin_src, fin->fin_dst); 3142 if (natl != NULL) { 3143 KFREE(nat); 3144 nat = natl; 3145 goto done; 3146 } 3147 3148 move = ipf_nat_newmap(fin, nat, &ni); 3149 } else { 3150 /* 3151 * NAT_INBOUND is used for redirects rules 3152 */ 3153 natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 3154 fin->fin_src, fin->fin_dst); 3155 if (natl != NULL) { 3156 KFREE(nat); 3157 nat = natl; 3158 goto done; 3159 } 3160 3161 move = ipf_nat_newrdr(fin, nat, &ni); 3162 } 3163 if (move == -1) 3164 goto badnat; 3165 3166 np = ni.nai_np; 3167 3168 nat->nat_mssclamp = np->in_mssclamp; 3169 nat->nat_me = natsave; 3170 nat->nat_fr = fin->fin_fr; 3171 nat->nat_rev = fin->fin_rev; 3172 nat->nat_ptr = np; 3173 nat->nat_dlocal = np->in_dlocal; 3174 3175 if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) { 3176 if (ipf_proxy_new(fin, nat) == -1) { 3177 NBUMPSIDED(fin->fin_out, ns_appr_fail); 3178 goto badnat; 3179 } 3180 } 3181 3182 nat->nat_ifps[0] = np->in_ifps[0]; 3183 if (np->in_ifps[0] != NULL) { 3184 COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]); 3185 } 3186 3187 nat->nat_ifps[1] = np->in_ifps[1]; 3188 if (np->in_ifps[1] != NULL) { 3189 COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]); 3190 } 3191 3192 if (ipf_nat_finalise(fin, nat) == -1) { 3193 goto badnat; 3194 } 3195 3196 np->in_use++; 3197 3198 if ((move == 1) && (np->in_flags & IPN_ROUNDR)) { 3199 if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) { 3200 ipf_nat_delrdr(softn, np); 3201 ipf_nat_addrdr(softn, np); 3202 } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) { 3203 ipf_nat_delmap(softn, np); 3204 ipf_nat_addmap(softn, np); 3205 } 3206 } 3207 3208 if (flags & SI_WILDP) 3209 nsp->ns_wilds++; 3210 nsp->ns_proto[nat->nat_pr[0]]++; 3211 3212 goto done; 3213 badnat: 3214 DT2(ns_badnatnew, fr_info_t *, fin, nat_t *, nat); 3215 NBUMPSIDE(fin->fin_out, ns_badnatnew); 3216 if ((hm = nat->nat_hm) != NULL) 3217 ipf_nat_hostmapdel(softc, &hm); 3218 KFREE(nat); 3219 nat = NULL; 3220 done: 3221 if (nat != NULL && np != NULL) 3222 np->in_hits++; 3223 if (natsave != NULL) 3224 *natsave = nat; 3225 return nat; 3226 } 3227 3228 3229 /* ------------------------------------------------------------------------ */ 3230 /* Function: ipf_nat_finalise */ 3231 /* Returns: int - 0 == sucess, -1 == failure */ 3232 /* Parameters: fin(I) - pointer to packet information */ 3233 /* nat(I) - pointer to NAT entry */ 3234 /* Write Lock: ipf_nat */ 3235 /* */ 3236 /* This is the tail end of constructing a new NAT entry and is the same */ 3237 /* for both IPv4 and IPv6. */ 3238 /* ------------------------------------------------------------------------ */ 3239 /*ARGSUSED*/ 3240 static int 3241 ipf_nat_finalise(fr_info_t *fin, nat_t *nat) 3242 { 3243 ipf_main_softc_t *softc = fin->fin_main_soft; 3244 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3245 u_32_t sum1, sum2, sumd; 3246 frentry_t *fr; 3247 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC) 3248 qpktinfo_t *qpi = fin->fin_qpi; 3249 #endif 3250 3251 switch (nat->nat_pr[0]) 3252 { 3253 case IPPROTO_ICMP : 3254 sum1 = LONG_SUM(ntohs(nat->nat_oicmpid)); 3255 sum2 = LONG_SUM(ntohs(nat->nat_nicmpid)); 3256 CALC_SUMD(sum1, sum2, sumd); 3257 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3258 3259 break; 3260 3261 default : 3262 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \ 3263 ntohs(nat->nat_osport)); 3264 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \ 3265 ntohs(nat->nat_nsport)); 3266 CALC_SUMD(sum1, sum2, sumd); 3267 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3268 3269 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \ 3270 ntohs(nat->nat_odport)); 3271 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \ 3272 ntohs(nat->nat_ndport)); 3273 CALC_SUMD(sum1, sum2, sumd); 3274 nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); 3275 break; 3276 } 3277 3278 /* 3279 * Compute the partial checksum, just in case. 3280 * This is only ever placed into outbound packets so care needs 3281 * to be taken over which pair of addresses are used. 3282 */ 3283 if (nat->nat_dir == NAT_OUTBOUND) { 3284 sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3285 sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr)); 3286 } else { 3287 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3288 sum1 += LONG_SUM(ntohl(nat->nat_odstaddr)); 3289 } 3290 sum1 += nat->nat_pr[1]; 3291 nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16); 3292 3293 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3294 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3295 CALC_SUMD(sum1, sum2, sumd); 3296 nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16); 3297 3298 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr)); 3299 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 3300 CALC_SUMD(sum1, sum2, sumd); 3301 nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16); 3302 3303 nat->nat_v[0] = 4; 3304 nat->nat_v[1] = 4; 3305 3306 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3307 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3308 } 3309 3310 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3311 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3312 } 3313 3314 if ((nat->nat_flags & SI_CLONE) == 0) 3315 nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat); 3316 3317 if (ipf_nat_insert(softc, softn, nat) == 0) { 3318 if (softn->ipf_nat_logging) 3319 ipf_nat_log(softc, softn, nat, NL_NEW); 3320 fr = nat->nat_fr; 3321 if (fr != NULL) { 3322 MUTEX_ENTER(&fr->fr_lock); 3323 fr->fr_ref++; 3324 MUTEX_EXIT(&fr->fr_lock); 3325 } 3326 return 0; 3327 } 3328 3329 NBUMPSIDED(fin->fin_out, ns_unfinalised); 3330 /* 3331 * nat_insert failed, so cleanup time... 3332 */ 3333 if (nat->nat_sync != NULL) 3334 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 3335 return -1; 3336 } 3337 3338 3339 /* ------------------------------------------------------------------------ */ 3340 /* Function: ipf_nat_insert */ 3341 /* Returns: int - 0 == sucess, -1 == failure */ 3342 /* Parameters: softc(I) - pointer to soft context main structure */ 3343 /* softn(I) - pointer to NAT context structure */ 3344 /* nat(I) - pointer to NAT structure */ 3345 /* Write Lock: ipf_nat */ 3346 /* */ 3347 /* Insert a NAT entry into the hash tables for searching and add it to the */ 3348 /* list of active NAT entries. Adjust global counters when complete. */ 3349 /* ------------------------------------------------------------------------ */ 3350 int 3351 ipf_nat_insert(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 3352 { 3353 u_int hv0, hv1; 3354 u_int sp, dp; 3355 ipnat_t *in; 3356 int ret; 3357 3358 /* 3359 * Try and return an error as early as possible, so calculate the hash 3360 * entry numbers first and then proceed. 3361 */ 3362 if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) { 3363 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3364 sp = nat->nat_osport; 3365 dp = nat->nat_odport; 3366 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3367 sp = 0; 3368 dp = nat->nat_oicmpid; 3369 } else { 3370 sp = 0; 3371 dp = 0; 3372 } 3373 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff); 3374 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff); 3375 /* 3376 * TRACE nat_osrcaddr, nat_osport, nat_odstaddr, 3377 * nat_odport, hv0 3378 */ 3379 3380 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3381 sp = nat->nat_nsport; 3382 dp = nat->nat_ndport; 3383 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3384 sp = 0; 3385 dp = nat->nat_nicmpid; 3386 } else { 3387 sp = 0; 3388 dp = 0; 3389 } 3390 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff); 3391 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff); 3392 /* 3393 * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, 3394 * nat_ndport, hv1 3395 */ 3396 } else { 3397 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff); 3398 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff); 3399 /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */ 3400 3401 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff); 3402 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff); 3403 /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */ 3404 } 3405 3406 if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { 3407 nat->nat_hv[0] = hv0; 3408 nat->nat_hv[1] = hv1; 3409 } else { 3410 nat->nat_hv[0] = hv1; 3411 nat->nat_hv[1] = hv0; 3412 } 3413 3414 MUTEX_INIT(&nat->nat_lock, "nat entry lock"); 3415 3416 in = nat->nat_ptr; 3417 nat->nat_ref = nat->nat_me ? 2 : 1; 3418 3419 nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0'; 3420 nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4); 3421 3422 if (nat->nat_ifnames[1][0] != '\0') { 3423 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3424 nat->nat_ifps[1] = ipf_resolvenic(softc, 3425 nat->nat_ifnames[1], 4); 3426 } else if (in->in_ifnames[1] != -1) { 3427 char *name; 3428 3429 name = in->in_names + in->in_ifnames[1]; 3430 if (name[1] != '\0' && name[0] != '-' && name[0] != '*') { 3431 (void) strncpy(nat->nat_ifnames[1], 3432 nat->nat_ifnames[0], LIFNAMSIZ); 3433 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3434 nat->nat_ifps[1] = nat->nat_ifps[0]; 3435 } 3436 } 3437 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3438 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3439 } 3440 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3441 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3442 } 3443 3444 ret = ipf_nat_hashtab_add(softc, softn, nat); 3445 if (ret == -1) 3446 MUTEX_DESTROY(&nat->nat_lock); 3447 return ret; 3448 } 3449 3450 3451 /* ------------------------------------------------------------------------ */ 3452 /* Function: ipf_nat_hashtab_add */ 3453 /* Returns: int - 0 == sucess, -1 == failure */ 3454 /* Parameters: softc(I) - pointer to soft context main structure */ 3455 /* softn(I) - pointer to NAT context structure */ 3456 /* nat(I) - pointer to NAT structure */ 3457 /* Write Lock: ipf_nat */ 3458 /* */ 3459 /* Handle the insertion of a NAT entry into the table/list. */ 3460 /* ------------------------------------------------------------------------ */ 3461 int 3462 ipf_nat_hashtab_add(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 3463 { 3464 nat_t **natp; 3465 u_int hv0; 3466 u_int hv1; 3467 3468 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 3469 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 3470 3471 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >= 3472 softn->ipf_nat_maxbucket) { 3473 DT1(ns_bucket_max_0, int, 3474 softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]); 3475 NBUMPSIDE(0, ns_bucket_max); 3476 return -1; 3477 } 3478 3479 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >= 3480 softn->ipf_nat_maxbucket) { 3481 DT1(ns_bucket_max_1, int, 3482 softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]); 3483 NBUMPSIDE(1, ns_bucket_max); 3484 return -1; 3485 } 3486 3487 /* 3488 * The ordering of operations in the list and hash table insertion 3489 * is very important. The last operation for each task should be 3490 * to update the top of the list, after all the "nexts" have been 3491 * done so that walking the list while it is being done does not 3492 * find strange pointers. 3493 * 3494 * Global list of NAT instances 3495 */ 3496 nat->nat_next = softn->ipf_nat_instances; 3497 nat->nat_pnext = &softn->ipf_nat_instances; 3498 if (softn->ipf_nat_instances) 3499 softn->ipf_nat_instances->nat_pnext = &nat->nat_next; 3500 softn->ipf_nat_instances = nat; 3501 3502 /* 3503 * Inbound hash table. 3504 */ 3505 natp = &softn->ipf_nat_table[0][hv0]; 3506 nat->nat_phnext[0] = natp; 3507 nat->nat_hnext[0] = *natp; 3508 if (*natp) { 3509 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 3510 } else { 3511 NBUMPSIDE(0, ns_inuse); 3512 } 3513 *natp = nat; 3514 NBUMPSIDE(0, ns_bucketlen[hv0]); 3515 3516 /* 3517 * Outbound hash table. 3518 */ 3519 natp = &softn->ipf_nat_table[1][hv1]; 3520 nat->nat_phnext[1] = natp; 3521 nat->nat_hnext[1] = *natp; 3522 if (*natp) 3523 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 3524 else { 3525 NBUMPSIDE(1, ns_inuse); 3526 } 3527 *natp = nat; 3528 NBUMPSIDE(1, ns_bucketlen[hv1]); 3529 3530 ipf_nat_setqueue(softc, softn, nat); 3531 3532 if (nat->nat_dir & NAT_OUTBOUND) { 3533 NBUMPSIDE(1, ns_added); 3534 } else { 3535 NBUMPSIDE(0, ns_added); 3536 } 3537 softn->ipf_nat_stats.ns_active++; 3538 return 0; 3539 } 3540 3541 3542 /* ------------------------------------------------------------------------ */ 3543 /* Function: ipf_nat_icmperrorlookup */ 3544 /* Returns: nat_t* - point to matching NAT structure */ 3545 /* Parameters: fin(I) - pointer to packet information */ 3546 /* dir(I) - direction of packet (in/out) */ 3547 /* */ 3548 /* Check if the ICMP error message is related to an existing TCP, UDP or */ 3549 /* ICMP query nat entry. It is assumed that the packet is already of the */ 3550 /* the required length. */ 3551 /* ------------------------------------------------------------------------ */ 3552 nat_t * 3553 ipf_nat_icmperrorlookup(fr_info_t *fin, int dir) 3554 { 3555 ipf_main_softc_t *softc = fin->fin_main_soft; 3556 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3557 int flags = 0, minlen; 3558 icmphdr_t *orgicmp; 3559 nat_stat_side_t *nside; 3560 tcphdr_t *tcp = NULL; 3561 u_short data[2]; 3562 nat_t *nat; 3563 ip_t *oip; 3564 u_int p; 3565 3566 nside = &softn->ipf_nat_stats.ns_side[fin->fin_out]; 3567 /* 3568 * Does it at least have the return (basic) IP header ? 3569 * Only a basic IP header (no options) should be with an ICMP error 3570 * header. Also, if it's not an error type, then return. 3571 */ 3572 if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) { 3573 ATOMIC_INCL(nside->ns_icmp_basic); 3574 return NULL; 3575 } 3576 3577 /* 3578 * Check packet size 3579 */ 3580 oip = (ip_t *)((char *)fin->fin_dp + 8); 3581 minlen = IP_HL(oip) << 2; 3582 if ((minlen < sizeof(ip_t)) || 3583 (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) { 3584 ATOMIC_INCL(nside->ns_icmp_size); 3585 return NULL; 3586 } 3587 3588 /* 3589 * Is the buffer big enough for all of it ? It's the size of the IP 3590 * header claimed in the encapsulated part which is of concern. It 3591 * may be too big to be in this buffer but not so big that it's 3592 * outside the ICMP packet, leading to TCP deref's causing problems. 3593 * This is possible because we don't know how big oip_hl is when we 3594 * do the pullup early in ipf_check() and thus can't gaurantee it is 3595 * all here now. 3596 */ 3597 #ifdef ipf_nat_KERNEL 3598 { 3599 mb_t *m; 3600 3601 m = fin->fin_m; 3602 # if defined(MENTAT) 3603 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3604 (char *)m->b_wptr) { 3605 ATOMIC_INCL(nside->ns_icmp_mbuf); 3606 return NULL; 3607 } 3608 # else 3609 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3610 (char *)fin->fin_ip + M_LEN(m)) { 3611 ATOMIC_INCL(nside->ns_icmp_mbuf); 3612 return NULL; 3613 } 3614 # endif 3615 } 3616 #endif 3617 3618 if (fin->fin_daddr != oip->ip_src.s_addr) { 3619 ATOMIC_INCL(nside->ns_icmp_address); 3620 return NULL; 3621 } 3622 3623 p = oip->ip_p; 3624 if (p == IPPROTO_TCP) 3625 flags = IPN_TCP; 3626 else if (p == IPPROTO_UDP) 3627 flags = IPN_UDP; 3628 else if (p == IPPROTO_ICMP) { 3629 orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3630 3631 /* see if this is related to an ICMP query */ 3632 if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) { 3633 data[0] = fin->fin_data[0]; 3634 data[1] = fin->fin_data[1]; 3635 fin->fin_data[0] = 0; 3636 fin->fin_data[1] = orgicmp->icmp_id; 3637 3638 flags = IPN_ICMPERR|IPN_ICMPQUERY; 3639 /* 3640 * NOTE : dir refers to the direction of the original 3641 * ip packet. By definition the icmp error 3642 * message flows in the opposite direction. 3643 */ 3644 if (dir == NAT_INBOUND) 3645 nat = ipf_nat_inlookup(fin, flags, p, 3646 oip->ip_dst, 3647 oip->ip_src); 3648 else 3649 nat = ipf_nat_outlookup(fin, flags, p, 3650 oip->ip_dst, 3651 oip->ip_src); 3652 fin->fin_data[0] = data[0]; 3653 fin->fin_data[1] = data[1]; 3654 return nat; 3655 } 3656 } 3657 3658 if (flags & IPN_TCPUDP) { 3659 minlen += 8; /* + 64bits of data to get ports */ 3660 /* TRACE (fin,minlen) */ 3661 if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) { 3662 ATOMIC_INCL(nside->ns_icmp_short); 3663 return NULL; 3664 } 3665 3666 data[0] = fin->fin_data[0]; 3667 data[1] = fin->fin_data[1]; 3668 tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3669 fin->fin_data[0] = ntohs(tcp->th_dport); 3670 fin->fin_data[1] = ntohs(tcp->th_sport); 3671 3672 if (dir == NAT_INBOUND) { 3673 nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst, 3674 oip->ip_src); 3675 } else { 3676 nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst, 3677 oip->ip_src); 3678 } 3679 fin->fin_data[0] = data[0]; 3680 fin->fin_data[1] = data[1]; 3681 return nat; 3682 } 3683 if (dir == NAT_INBOUND) 3684 nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3685 else 3686 nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3687 3688 return nat; 3689 } 3690 3691 3692 /* ------------------------------------------------------------------------ */ 3693 /* Function: ipf_nat_icmperror */ 3694 /* Returns: nat_t* - point to matching NAT structure */ 3695 /* Parameters: fin(I) - pointer to packet information */ 3696 /* nflags(I) - NAT flags for this packet */ 3697 /* dir(I) - direction of packet (in/out) */ 3698 /* */ 3699 /* Fix up an ICMP packet which is an error message for an existing NAT */ 3700 /* session. This will correct both packet header data and checksums. */ 3701 /* */ 3702 /* This should *ONLY* be used for incoming ICMP error packets to make sure */ 3703 /* a NAT'd ICMP packet gets correctly recognised. */ 3704 /* ------------------------------------------------------------------------ */ 3705 nat_t * 3706 ipf_nat_icmperror(fr_info_t *fin, u_int *nflags, int dir) 3707 { 3708 ipf_main_softc_t *softc = fin->fin_main_soft; 3709 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3710 u_32_t sum1, sum2, sumd, sumd2; 3711 struct in_addr a1, a2, a3, a4; 3712 int flags, dlen, odst; 3713 icmphdr_t *icmp; 3714 u_short *csump; 3715 tcphdr_t *tcp; 3716 nat_t *nat; 3717 ip_t *oip; 3718 void *dp; 3719 3720 if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 3721 NBUMPSIDED(fin->fin_out, ns_icmp_short); 3722 return NULL; 3723 } 3724 3725 /* 3726 * ipf_nat_icmperrorlookup() will return NULL for `defective' packets. 3727 */ 3728 if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) { 3729 NBUMPSIDED(fin->fin_out, ns_icmp_notfound); 3730 return NULL; 3731 } 3732 3733 tcp = NULL; 3734 csump = NULL; 3735 flags = 0; 3736 sumd2 = 0; 3737 *nflags = IPN_ICMPERR; 3738 icmp = fin->fin_dp; 3739 oip = (ip_t *)&icmp->icmp_ip; 3740 dp = (((char *)oip) + (IP_HL(oip) << 2)); 3741 if (oip->ip_p == IPPROTO_TCP) { 3742 tcp = (tcphdr_t *)dp; 3743 csump = (u_short *)&tcp->th_sum; 3744 flags = IPN_TCP; 3745 } else if (oip->ip_p == IPPROTO_UDP) { 3746 udphdr_t *udp; 3747 3748 udp = (udphdr_t *)dp; 3749 tcp = (tcphdr_t *)dp; 3750 csump = (u_short *)&udp->uh_sum; 3751 flags = IPN_UDP; 3752 } else if (oip->ip_p == IPPROTO_ICMP) 3753 flags = IPN_ICMPQUERY; 3754 dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip); 3755 3756 /* 3757 * Need to adjust ICMP header to include the real IP#'s and 3758 * port #'s. Only apply a checksum change relative to the 3759 * IP address change as it will be modified again in ipf_nat_checkout 3760 * for both address and port. Two checksum changes are 3761 * necessary for the two header address changes. Be careful 3762 * to only modify the checksum once for the port # and twice 3763 * for the IP#. 3764 */ 3765 3766 /* 3767 * Step 1 3768 * Fix the IP addresses in the offending IP packet. You also need 3769 * to adjust the IP header checksum of that offending IP packet. 3770 * 3771 * Normally, you would expect that the ICMP checksum of the 3772 * ICMP error message needs to be adjusted as well for the 3773 * IP address change in oip. 3774 * However, this is a NOP, because the ICMP checksum is 3775 * calculated over the complete ICMP packet, which includes the 3776 * changed oip IP addresses and oip->ip_sum. However, these 3777 * two changes cancel each other out (if the delta for 3778 * the IP address is x, then the delta for ip_sum is minus x), 3779 * so no change in the icmp_cksum is necessary. 3780 * 3781 * Inbound ICMP 3782 * ------------ 3783 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3784 * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b) 3785 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip 3786 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip 3787 * 3788 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3789 * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3790 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3791 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3792 * 3793 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3794 * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d) 3795 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip 3796 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip 3797 * 3798 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3799 * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3800 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3801 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3802 * 3803 * Outbound ICMP 3804 * ------------- 3805 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3806 * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3807 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3808 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3809 * 3810 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3811 * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c) 3812 * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip 3813 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3814 * 3815 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3816 * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d) 3817 * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip 3818 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3819 * 3820 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3821 * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a) 3822 * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip 3823 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3824 */ 3825 3826 if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) || 3827 ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) { 3828 a1.s_addr = ntohl(nat->nat_osrcaddr); 3829 a4.s_addr = ntohl(oip->ip_src.s_addr); 3830 a3.s_addr = ntohl(nat->nat_odstaddr); 3831 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3832 oip->ip_src.s_addr = htonl(a1.s_addr); 3833 oip->ip_dst.s_addr = htonl(a3.s_addr); 3834 odst = 1; 3835 } else { 3836 a1.s_addr = ntohl(nat->nat_ndstaddr); 3837 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3838 a3.s_addr = ntohl(nat->nat_nsrcaddr); 3839 a4.s_addr = ntohl(oip->ip_src.s_addr); 3840 oip->ip_dst.s_addr = htonl(a3.s_addr); 3841 oip->ip_src.s_addr = htonl(a1.s_addr); 3842 odst = 0; 3843 } 3844 sum1 = 0; 3845 sum2 = 0; 3846 sumd = 0; 3847 CALC_SUMD(a2.s_addr, a3.s_addr, sum1); 3848 CALC_SUMD(a4.s_addr, a1.s_addr, sum2); 3849 sumd = sum2 + sum1; 3850 if (sumd != 0) 3851 ipf_fix_datacksum(&oip->ip_sum, sumd); 3852 3853 sumd2 = sumd; 3854 sum1 = 0; 3855 sum2 = 0; 3856 3857 /* 3858 * Fix UDP pseudo header checksum to compensate for the 3859 * IP address change. 3860 */ 3861 if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) { 3862 u_32_t sum3, sum4, sumt; 3863 3864 /* 3865 * Step 2 : 3866 * For offending TCP/UDP IP packets, translate the ports as 3867 * well, based on the NAT specification. Of course such 3868 * a change may be reflected in the ICMP checksum as well. 3869 * 3870 * Since the port fields are part of the TCP/UDP checksum 3871 * of the offending IP packet, you need to adjust that checksum 3872 * as well... except that the change in the port numbers should 3873 * be offset by the checksum change. However, the TCP/UDP 3874 * checksum will also need to change if there has been an 3875 * IP address change. 3876 */ 3877 if (odst == 1) { 3878 sum1 = ntohs(nat->nat_osport); 3879 sum4 = ntohs(tcp->th_sport); 3880 sum3 = ntohs(nat->nat_odport); 3881 sum2 = ntohs(tcp->th_dport); 3882 3883 tcp->th_sport = htons(sum1); 3884 tcp->th_dport = htons(sum3); 3885 } else { 3886 sum1 = ntohs(nat->nat_ndport); 3887 sum2 = ntohs(tcp->th_dport); 3888 sum3 = ntohs(nat->nat_nsport); 3889 sum4 = ntohs(tcp->th_sport); 3890 3891 tcp->th_dport = htons(sum3); 3892 tcp->th_sport = htons(sum1); 3893 } 3894 CALC_SUMD(sum4, sum1, sumt); 3895 sumd += sumt; 3896 CALC_SUMD(sum2, sum3, sumt); 3897 sumd += sumt; 3898 3899 if (sumd != 0 || sumd2 != 0) { 3900 /* 3901 * At this point, sumd is the delta to apply to the 3902 * TCP/UDP header, given the changes in both the IP 3903 * address and the ports and sumd2 is the delta to 3904 * apply to the ICMP header, given the IP address 3905 * change delta that may need to be applied to the 3906 * TCP/UDP checksum instead. 3907 * 3908 * If we will both the IP and TCP/UDP checksums 3909 * then the ICMP checksum changes by the address 3910 * delta applied to the TCP/UDP checksum. If we 3911 * do not change the TCP/UDP checksum them we 3912 * apply the delta in ports to the ICMP checksum. 3913 */ 3914 if (oip->ip_p == IPPROTO_UDP) { 3915 if ((dlen >= 8) && (*csump != 0)) { 3916 ipf_fix_datacksum(csump, sumd); 3917 } else { 3918 CALC_SUMD(sum1, sum4, sumd2); 3919 CALC_SUMD(sum3, sum2, sumt); 3920 sumd2 += sumt; 3921 } 3922 } else if (oip->ip_p == IPPROTO_TCP) { 3923 if (dlen >= 18) { 3924 ipf_fix_datacksum(csump, sumd); 3925 } else { 3926 CALC_SUMD(sum1, sum4, sumd2); 3927 CALC_SUMD(sum3, sum2, sumt); 3928 sumd2 += sumt; 3929 } 3930 } 3931 if (sumd2 != 0) { 3932 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3933 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3934 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3935 ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0); 3936 } 3937 } 3938 } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) { 3939 icmphdr_t *orgicmp; 3940 3941 /* 3942 * XXX - what if this is bogus hl and we go off the end ? 3943 * In this case, ipf_nat_icmperrorlookup() will have 3944 * returned NULL. 3945 */ 3946 orgicmp = (icmphdr_t *)dp; 3947 3948 if (odst == 1) { 3949 if (orgicmp->icmp_id != nat->nat_osport) { 3950 3951 /* 3952 * Fix ICMP checksum (of the offening ICMP 3953 * query packet) to compensate the change 3954 * in the ICMP id of the offending ICMP 3955 * packet. 3956 * 3957 * Since you modify orgicmp->icmp_id with 3958 * a delta (say x) and you compensate that 3959 * in origicmp->icmp_cksum with a delta 3960 * minus x, you don't have to adjust the 3961 * overall icmp->icmp_cksum 3962 */ 3963 sum1 = ntohs(orgicmp->icmp_id); 3964 sum2 = ntohs(nat->nat_oicmpid); 3965 CALC_SUMD(sum1, sum2, sumd); 3966 orgicmp->icmp_id = nat->nat_oicmpid; 3967 ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd); 3968 } 3969 } /* nat_dir == NAT_INBOUND is impossible for icmp queries */ 3970 } 3971 return nat; 3972 } 3973 3974 3975 /* 3976 * MAP-IN MAP-OUT RDR-IN RDR-OUT 3977 * osrc X == src == src X 3978 * odst X == dst == dst X 3979 * nsrc == dst X X == dst 3980 * ndst == src X X == src 3981 * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND 3982 */ 3983 /* 3984 * NB: these lookups don't lock access to the list, it assumed that it has 3985 * already been done! 3986 */ 3987 /* ------------------------------------------------------------------------ */ 3988 /* Function: ipf_nat_inlookup */ 3989 /* Returns: nat_t* - NULL == no match, */ 3990 /* else pointer to matching NAT entry */ 3991 /* Parameters: fin(I) - pointer to packet information */ 3992 /* flags(I) - NAT flags for this packet */ 3993 /* p(I) - protocol for this packet */ 3994 /* src(I) - source IP address */ 3995 /* mapdst(I) - destination IP address */ 3996 /* */ 3997 /* Lookup a nat entry based on the mapped destination ip address/port and */ 3998 /* real source address/port. We use this lookup when receiving a packet, */ 3999 /* we're looking for a table entry, based on the destination address. */ 4000 /* */ 4001 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4002 /* */ 4003 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4004 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4005 /* */ 4006 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4007 /* the packet is of said protocol */ 4008 /* ------------------------------------------------------------------------ */ 4009 nat_t * 4010 ipf_nat_inlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, 4011 struct in_addr mapdst) 4012 { 4013 ipf_main_softc_t *softc = fin->fin_main_soft; 4014 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4015 u_short sport, dport; 4016 ipnat_t *ipn; 4017 nat_t *nat; 4018 int nflags; 4019 u_32_t dst; 4020 void *ifp; 4021 u_int hv, rhv; 4022 4023 ifp = fin->fin_ifp; 4024 dst = mapdst.s_addr; 4025 4026 switch (p) 4027 { 4028 case IPPROTO_TCP : 4029 case IPPROTO_UDP : 4030 sport = htons(fin->fin_data[0]); 4031 dport = htons(fin->fin_data[1]); 4032 break; 4033 case IPPROTO_ICMP : 4034 if (flags & IPN_ICMPERR) { 4035 sport = fin->fin_data[1]; 4036 dport = 0; 4037 } else { 4038 dport = fin->fin_data[1]; 4039 sport = 0; 4040 } 4041 break; 4042 default : 4043 sport = 0; 4044 dport = 0; 4045 break; 4046 } 4047 4048 4049 if ((flags & SI_WILDP) != 0) 4050 goto find_in_wild_ports; 4051 4052 rhv = NAT_HASH_FN(dst, dport, 0xffffffff); 4053 rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff); 4054 hv = rhv % softn->ipf_nat_table_sz; 4055 nat = softn->ipf_nat_table[1][hv]; 4056 /* TRACE dst, dport, src, sport, hv, nat */ 4057 4058 for (; nat; nat = nat->nat_hnext[1]) { 4059 if (nat->nat_ifps[0] != NULL) { 4060 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4061 continue; 4062 } 4063 4064 if (nat->nat_pr[0] != p) 4065 continue; 4066 4067 switch (nat->nat_dir) 4068 { 4069 case NAT_INBOUND : 4070 case NAT_DIVERTIN : 4071 if (nat->nat_v[0] != 4) 4072 continue; 4073 if (nat->nat_osrcaddr != src.s_addr || 4074 nat->nat_odstaddr != dst) 4075 continue; 4076 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4077 if (nat->nat_osport != sport) 4078 continue; 4079 if (nat->nat_odport != dport) 4080 continue; 4081 4082 } else if (p == IPPROTO_ICMP) { 4083 if (nat->nat_osport != dport) { 4084 continue; 4085 } 4086 } 4087 break; 4088 case NAT_DIVERTOUT : 4089 if (nat->nat_dlocal) 4090 continue; 4091 case NAT_OUTBOUND : 4092 if (nat->nat_v[1] != 4) 4093 continue; 4094 if (nat->nat_dlocal) 4095 continue; 4096 if (nat->nat_dlocal) 4097 continue; 4098 if (nat->nat_ndstaddr != src.s_addr || 4099 nat->nat_nsrcaddr != dst) 4100 continue; 4101 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4102 if (nat->nat_ndport != sport) 4103 continue; 4104 if (nat->nat_nsport != dport) 4105 continue; 4106 4107 } else if (p == IPPROTO_ICMP) { 4108 if (nat->nat_osport != dport) { 4109 continue; 4110 } 4111 } 4112 break; 4113 } 4114 4115 4116 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4117 ipn = nat->nat_ptr; 4118 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4119 if (ipf_proxy_match(fin, nat) != 0) 4120 continue; 4121 } 4122 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4123 nat->nat_ifps[0] = ifp; 4124 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4125 } 4126 return nat; 4127 } 4128 4129 /* 4130 * So if we didn't find it but there are wildcard members in the hash 4131 * table, go back and look for them. We do this search and update here 4132 * because it is modifying the NAT table and we want to do this only 4133 * for the first packet that matches. The exception, of course, is 4134 * for "dummy" (FI_IGNORE) lookups. 4135 */ 4136 find_in_wild_ports: 4137 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4138 NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0); 4139 return NULL; 4140 } 4141 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4142 NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0); 4143 return NULL; 4144 } 4145 4146 RWLOCK_EXIT(&softc->ipf_nat); 4147 4148 hv = NAT_HASH_FN(dst, 0, 0xffffffff); 4149 hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz); 4150 WRITE_ENTER(&softc->ipf_nat); 4151 4152 nat = softn->ipf_nat_table[1][hv]; 4153 /* TRACE dst, src, hv, nat */ 4154 for (; nat; nat = nat->nat_hnext[1]) { 4155 if (nat->nat_ifps[0] != NULL) { 4156 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4157 continue; 4158 } 4159 4160 if (nat->nat_pr[0] != fin->fin_p) 4161 continue; 4162 4163 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4164 { 4165 case NAT_INBOUND : 4166 if (nat->nat_v[0] != 4) 4167 continue; 4168 if (nat->nat_osrcaddr != src.s_addr || 4169 nat->nat_odstaddr != dst) 4170 continue; 4171 break; 4172 case NAT_OUTBOUND : 4173 if (nat->nat_v[1] != 4) 4174 continue; 4175 if (nat->nat_ndstaddr != src.s_addr || 4176 nat->nat_nsrcaddr != dst) 4177 continue; 4178 break; 4179 } 4180 4181 nflags = nat->nat_flags; 4182 if (!(nflags & (NAT_TCPUDP|SI_WILDP))) 4183 continue; 4184 4185 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags, 4186 NAT_INBOUND) == 1) { 4187 if ((fin->fin_flx & FI_IGNORE) != 0) 4188 break; 4189 if ((nflags & SI_CLONE) != 0) { 4190 nat = ipf_nat_clone(fin, nat); 4191 if (nat == NULL) 4192 break; 4193 } else { 4194 MUTEX_ENTER(&softn->ipf_nat_new); 4195 softn->ipf_nat_stats.ns_wilds--; 4196 MUTEX_EXIT(&softn->ipf_nat_new); 4197 } 4198 4199 if (nat->nat_dir == NAT_INBOUND) { 4200 if (nat->nat_osport == 0) { 4201 nat->nat_osport = sport; 4202 nat->nat_nsport = sport; 4203 } 4204 if (nat->nat_odport == 0) { 4205 nat->nat_odport = dport; 4206 nat->nat_ndport = dport; 4207 } 4208 } else if (nat->nat_dir == NAT_OUTBOUND) { 4209 if (nat->nat_osport == 0) { 4210 nat->nat_osport = dport; 4211 nat->nat_nsport = dport; 4212 } 4213 if (nat->nat_odport == 0) { 4214 nat->nat_odport = sport; 4215 nat->nat_ndport = sport; 4216 } 4217 } 4218 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4219 nat->nat_ifps[0] = ifp; 4220 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4221 } 4222 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4223 ipf_nat_tabmove(softn, nat); 4224 break; 4225 } 4226 } 4227 4228 MUTEX_DOWNGRADE(&softc->ipf_nat); 4229 4230 if (nat == NULL) { 4231 NBUMPSIDE(0, ns_lookup_miss); 4232 } 4233 return nat; 4234 } 4235 4236 4237 /* ------------------------------------------------------------------------ */ 4238 /* Function: ipf_nat_tabmove */ 4239 /* Returns: Nil */ 4240 /* Parameters: softn(I) - pointer to NAT context structure */ 4241 /* nat(I) - pointer to NAT structure */ 4242 /* Write Lock: ipf_nat */ 4243 /* */ 4244 /* This function is only called for TCP/UDP NAT table entries where the */ 4245 /* original was placed in the table without hashing on the ports and we now */ 4246 /* want to include hashing on port numbers. */ 4247 /* ------------------------------------------------------------------------ */ 4248 static void 4249 ipf_nat_tabmove(ipf_nat_softc_t *softn, nat_t *nat) 4250 { 4251 u_int hv0, hv1, rhv0, rhv1; 4252 natstat_t *nsp; 4253 nat_t **natp; 4254 4255 if (nat->nat_flags & SI_CLONE) 4256 return; 4257 4258 nsp = &softn->ipf_nat_stats; 4259 /* 4260 * Remove the NAT entry from the old location 4261 */ 4262 if (nat->nat_hnext[0]) 4263 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 4264 *nat->nat_phnext[0] = nat->nat_hnext[0]; 4265 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 4266 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 4267 4268 ASSERT(nsp->ns_side[0].ns_bucketlen[hv0] > 0); 4269 nsp->ns_side[0].ns_bucketlen[hv0]--; 4270 4271 if (nat->nat_hnext[1]) 4272 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 4273 *nat->nat_phnext[1] = nat->nat_hnext[1]; 4274 ASSERT(nsp->ns_side[1].ns_bucketlen[hv1] > 0); 4275 nsp->ns_side[1].ns_bucketlen[hv1]--; 4276 4277 /* 4278 * Add into the NAT table in the new position 4279 */ 4280 rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff); 4281 rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport, 4282 0xffffffff); 4283 rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff); 4284 rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport, 4285 0xffffffff); 4286 4287 if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { 4288 nat->nat_hv[0] = rhv0; 4289 nat->nat_hv[1] = rhv1; 4290 } else { 4291 nat->nat_hv[0] = rhv1; 4292 nat->nat_hv[1] = rhv0; 4293 } 4294 4295 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 4296 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 4297 4298 /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */ 4299 /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */ 4300 4301 natp = &softn->ipf_nat_table[0][hv0]; 4302 if (*natp) 4303 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 4304 nat->nat_phnext[0] = natp; 4305 nat->nat_hnext[0] = *natp; 4306 *natp = nat; 4307 nsp->ns_side[0].ns_bucketlen[hv0]++; 4308 4309 natp = &softn->ipf_nat_table[1][hv1]; 4310 if (*natp) 4311 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 4312 nat->nat_phnext[1] = natp; 4313 nat->nat_hnext[1] = *natp; 4314 *natp = nat; 4315 nsp->ns_side[1].ns_bucketlen[hv1]++; 4316 } 4317 4318 4319 /* ------------------------------------------------------------------------ */ 4320 /* Function: ipf_nat_outlookup */ 4321 /* Returns: nat_t* - NULL == no match, */ 4322 /* else pointer to matching NAT entry */ 4323 /* Parameters: fin(I) - pointer to packet information */ 4324 /* flags(I) - NAT flags for this packet */ 4325 /* p(I) - protocol for this packet */ 4326 /* src(I) - source IP address */ 4327 /* dst(I) - destination IP address */ 4328 /* rw(I) - 1 == write lock on held, 0 == read lock. */ 4329 /* */ 4330 /* Lookup a nat entry based on the source 'real' ip address/port and */ 4331 /* destination address/port. We use this lookup when sending a packet out, */ 4332 /* we're looking for a table entry, based on the source address. */ 4333 /* */ 4334 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4335 /* */ 4336 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4337 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4338 /* */ 4339 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4340 /* the packet is of said protocol */ 4341 /* ------------------------------------------------------------------------ */ 4342 nat_t * 4343 ipf_nat_outlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, 4344 struct in_addr dst) 4345 { 4346 ipf_main_softc_t *softc = fin->fin_main_soft; 4347 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4348 u_short sport, dport; 4349 ipnat_t *ipn; 4350 nat_t *nat; 4351 void *ifp; 4352 u_int hv; 4353 4354 ifp = fin->fin_ifp; 4355 sport = 0; 4356 dport = 0; 4357 4358 switch (p) 4359 { 4360 case IPPROTO_TCP : 4361 case IPPROTO_UDP : 4362 sport = htons(fin->fin_data[0]); 4363 dport = htons(fin->fin_data[1]); 4364 break; 4365 case IPPROTO_ICMP : 4366 if (flags & IPN_ICMPERR) 4367 sport = fin->fin_data[1]; 4368 else 4369 dport = fin->fin_data[1]; 4370 break; 4371 default : 4372 break; 4373 } 4374 4375 if ((flags & SI_WILDP) != 0) 4376 goto find_out_wild_ports; 4377 4378 hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff); 4379 hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz); 4380 nat = softn->ipf_nat_table[0][hv]; 4381 4382 /* TRACE src, sport, dst, dport, hv, nat */ 4383 4384 for (; nat; nat = nat->nat_hnext[0]) { 4385 if (nat->nat_ifps[1] != NULL) { 4386 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4387 continue; 4388 } 4389 4390 if (nat->nat_pr[1] != p) 4391 continue; 4392 4393 switch (nat->nat_dir) 4394 { 4395 case NAT_INBOUND : 4396 case NAT_DIVERTIN : 4397 if (nat->nat_v[1] != 4) 4398 continue; 4399 if (nat->nat_ndstaddr != src.s_addr || 4400 nat->nat_nsrcaddr != dst.s_addr) 4401 continue; 4402 4403 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4404 if (nat->nat_ndport != sport) 4405 continue; 4406 if (nat->nat_nsport != dport) 4407 continue; 4408 4409 } else if (p == IPPROTO_ICMP) { 4410 if (nat->nat_osport != dport) { 4411 continue; 4412 } 4413 } 4414 break; 4415 case NAT_OUTBOUND : 4416 case NAT_DIVERTOUT : 4417 if (nat->nat_v[0] != 4) 4418 continue; 4419 if (nat->nat_osrcaddr != src.s_addr || 4420 nat->nat_odstaddr != dst.s_addr) 4421 continue; 4422 4423 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4424 if (nat->nat_odport != dport) 4425 continue; 4426 if (nat->nat_osport != sport) 4427 continue; 4428 4429 } else if (p == IPPROTO_ICMP) { 4430 if (nat->nat_osport != dport) { 4431 continue; 4432 } 4433 } 4434 break; 4435 } 4436 4437 ipn = nat->nat_ptr; 4438 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4439 if (ipf_proxy_match(fin, nat) != 0) 4440 continue; 4441 4442 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4443 nat->nat_ifps[1] = ifp; 4444 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4445 } 4446 return nat; 4447 } 4448 4449 /* 4450 * So if we didn't find it but there are wildcard members in the hash 4451 * table, go back and look for them. We do this search and update here 4452 * because it is modifying the NAT table and we want to do this only 4453 * for the first packet that matches. The exception, of course, is 4454 * for "dummy" (FI_IGNORE) lookups. 4455 */ 4456 find_out_wild_ports: 4457 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4458 NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1); 4459 return NULL; 4460 } 4461 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4462 NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1); 4463 return NULL; 4464 } 4465 4466 RWLOCK_EXIT(&softc->ipf_nat); 4467 4468 hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff); 4469 hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz); 4470 4471 WRITE_ENTER(&softc->ipf_nat); 4472 4473 nat = softn->ipf_nat_table[0][hv]; 4474 for (; nat; nat = nat->nat_hnext[0]) { 4475 if (nat->nat_ifps[1] != NULL) { 4476 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4477 continue; 4478 } 4479 4480 if (nat->nat_pr[1] != fin->fin_p) 4481 continue; 4482 4483 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4484 { 4485 case NAT_INBOUND : 4486 if (nat->nat_v[1] != 4) 4487 continue; 4488 if (nat->nat_ndstaddr != src.s_addr || 4489 nat->nat_nsrcaddr != dst.s_addr) 4490 continue; 4491 break; 4492 case NAT_OUTBOUND : 4493 if (nat->nat_v[0] != 4) 4494 continue; 4495 if (nat->nat_osrcaddr != src.s_addr || 4496 nat->nat_odstaddr != dst.s_addr) 4497 continue; 4498 break; 4499 } 4500 4501 if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP))) 4502 continue; 4503 4504 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags, 4505 NAT_OUTBOUND) == 1) { 4506 if ((fin->fin_flx & FI_IGNORE) != 0) 4507 break; 4508 if ((nat->nat_flags & SI_CLONE) != 0) { 4509 nat = ipf_nat_clone(fin, nat); 4510 if (nat == NULL) 4511 break; 4512 } else { 4513 MUTEX_ENTER(&softn->ipf_nat_new); 4514 softn->ipf_nat_stats.ns_wilds--; 4515 MUTEX_EXIT(&softn->ipf_nat_new); 4516 } 4517 4518 if (nat->nat_dir == NAT_OUTBOUND) { 4519 if (nat->nat_osport == 0) { 4520 nat->nat_osport = sport; 4521 nat->nat_nsport = sport; 4522 } 4523 if (nat->nat_odport == 0) { 4524 nat->nat_odport = dport; 4525 nat->nat_ndport = dport; 4526 } 4527 } else if (nat->nat_dir == NAT_INBOUND) { 4528 if (nat->nat_osport == 0) { 4529 nat->nat_osport = dport; 4530 nat->nat_nsport = dport; 4531 } 4532 if (nat->nat_odport == 0) { 4533 nat->nat_odport = sport; 4534 nat->nat_ndport = sport; 4535 } 4536 } 4537 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4538 nat->nat_ifps[1] = ifp; 4539 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4540 } 4541 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4542 ipf_nat_tabmove(softn, nat); 4543 break; 4544 } 4545 } 4546 4547 MUTEX_DOWNGRADE(&softc->ipf_nat); 4548 4549 if (nat == NULL) { 4550 NBUMPSIDE(1, ns_lookup_miss); 4551 } 4552 return nat; 4553 } 4554 4555 4556 /* ------------------------------------------------------------------------ */ 4557 /* Function: ipf_nat_lookupredir */ 4558 /* Returns: nat_t* - NULL == no match, */ 4559 /* else pointer to matching NAT entry */ 4560 /* Parameters: np(I) - pointer to description of packet to find NAT table */ 4561 /* entry for. */ 4562 /* */ 4563 /* Lookup the NAT tables to search for a matching redirect */ 4564 /* The contents of natlookup_t should imitate those found in a packet that */ 4565 /* would be translated - ie a packet coming in for RDR or going out for MAP.*/ 4566 /* We can do the lookup in one of two ways, imitating an inbound or */ 4567 /* outbound packet. By default we assume outbound, unless IPN_IN is set. */ 4568 /* For IN, the fields are set as follows: */ 4569 /* nl_real* = source information */ 4570 /* nl_out* = destination information (translated) */ 4571 /* For an out packet, the fields are set like this: */ 4572 /* nl_in* = source information (untranslated) */ 4573 /* nl_out* = destination information (translated) */ 4574 /* ------------------------------------------------------------------------ */ 4575 nat_t * 4576 ipf_nat_lookupredir(natlookup_t *np) 4577 { 4578 fr_info_t fi; 4579 nat_t *nat; 4580 4581 bzero((char *)&fi, sizeof(fi)); 4582 if (np->nl_flags & IPN_IN) { 4583 fi.fin_data[0] = ntohs(np->nl_realport); 4584 fi.fin_data[1] = ntohs(np->nl_outport); 4585 } else { 4586 fi.fin_data[0] = ntohs(np->nl_inport); 4587 fi.fin_data[1] = ntohs(np->nl_outport); 4588 } 4589 if (np->nl_flags & IPN_TCP) 4590 fi.fin_p = IPPROTO_TCP; 4591 else if (np->nl_flags & IPN_UDP) 4592 fi.fin_p = IPPROTO_UDP; 4593 else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY)) 4594 fi.fin_p = IPPROTO_ICMP; 4595 4596 /* 4597 * We can do two sorts of lookups: 4598 * - IPN_IN: we have the `real' and `out' address, look for `in'. 4599 * - default: we have the `in' and `out' address, look for `real'. 4600 */ 4601 if (np->nl_flags & IPN_IN) { 4602 if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p, 4603 np->nl_realip, np->nl_outip))) { 4604 np->nl_inip = nat->nat_odstip; 4605 np->nl_inport = nat->nat_odport; 4606 } 4607 } else { 4608 /* 4609 * If nl_inip is non null, this is a lookup based on the real 4610 * ip address. Else, we use the fake. 4611 */ 4612 if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p, 4613 np->nl_inip, np->nl_outip))) { 4614 4615 if ((np->nl_flags & IPN_FINDFORWARD) != 0) { 4616 fr_info_t fin; 4617 bzero((char *)&fin, sizeof(fin)); 4618 fin.fin_p = nat->nat_pr[0]; 4619 fin.fin_data[0] = ntohs(nat->nat_ndport); 4620 fin.fin_data[1] = ntohs(nat->nat_nsport); 4621 if (ipf_nat_inlookup(&fin, np->nl_flags, 4622 fin.fin_p, nat->nat_ndstip, 4623 nat->nat_nsrcip) != NULL) { 4624 np->nl_flags &= ~IPN_FINDFORWARD; 4625 } 4626 } 4627 4628 np->nl_realip = nat->nat_ndstip; 4629 np->nl_realport = nat->nat_ndport; 4630 } 4631 } 4632 4633 return nat; 4634 } 4635 4636 4637 /* ------------------------------------------------------------------------ */ 4638 /* Function: ipf_nat_match */ 4639 /* Returns: int - 0 == no match, 1 == match */ 4640 /* Parameters: fin(I) - pointer to packet information */ 4641 /* np(I) - pointer to NAT rule */ 4642 /* */ 4643 /* Pull the matching of a packet against a NAT rule out of that complex */ 4644 /* loop inside ipf_nat_checkin() and lay it out properly in its own function. */ 4645 /* ------------------------------------------------------------------------ */ 4646 static int 4647 ipf_nat_match(fr_info_t *fin, ipnat_t *np) 4648 { 4649 ipf_main_softc_t *softc = fin->fin_main_soft; 4650 frtuc_t *ft; 4651 int match; 4652 4653 match = 0; 4654 switch (np->in_osrcatype) 4655 { 4656 case FRI_NORMAL : 4657 match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr); 4658 break; 4659 case FRI_LOOKUP : 4660 match = (*np->in_osrcfunc)(softc, np->in_osrcptr, 4661 4, &fin->fin_saddr, fin->fin_plen); 4662 break; 4663 } 4664 match ^= ((np->in_flags & IPN_NOTSRC) != 0); 4665 if (match) 4666 return 0; 4667 4668 match = 0; 4669 switch (np->in_odstatype) 4670 { 4671 case FRI_NORMAL : 4672 match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr); 4673 break; 4674 case FRI_LOOKUP : 4675 match = (*np->in_odstfunc)(softc, np->in_odstptr, 4676 4, &fin->fin_daddr, fin->fin_plen); 4677 break; 4678 } 4679 4680 match ^= ((np->in_flags & IPN_NOTDST) != 0); 4681 if (match) 4682 return 0; 4683 4684 ft = &np->in_tuc; 4685 if (!(fin->fin_flx & FI_TCPUDP) || 4686 (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 4687 if (ft->ftu_scmp || ft->ftu_dcmp) 4688 return 0; 4689 return 1; 4690 } 4691 4692 return ipf_tcpudpchk(&fin->fin_fi, ft); 4693 } 4694 4695 4696 /* ------------------------------------------------------------------------ */ 4697 /* Function: ipf_nat_update */ 4698 /* Returns: Nil */ 4699 /* Parameters: fin(I) - pointer to packet information */ 4700 /* nat(I) - pointer to NAT structure */ 4701 /* */ 4702 /* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */ 4703 /* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */ 4704 /* */ 4705 /* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */ 4706 /* already be set. */ 4707 /* ------------------------------------------------------------------------ */ 4708 void 4709 ipf_nat_update(fr_info_t *fin, nat_t *nat) 4710 { 4711 ipf_main_softc_t *softc = fin->fin_main_soft; 4712 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4713 ipftq_t *ifq, *ifq2; 4714 ipftqent_t *tqe; 4715 ipnat_t *np = nat->nat_ptr; 4716 4717 tqe = &nat->nat_tqe; 4718 ifq = tqe->tqe_ifq; 4719 4720 /* 4721 * We allow over-riding of NAT timeouts from NAT rules, even for 4722 * TCP, however, if it is TCP and there is no rule timeout set, 4723 * then do not update the timeout here. 4724 */ 4725 if (np != NULL) { 4726 np->in_bytes[fin->fin_rev] += fin->fin_plen; 4727 ifq2 = np->in_tqehead[fin->fin_rev]; 4728 } else { 4729 ifq2 = NULL; 4730 } 4731 4732 if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) { 4733 (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq, 4734 0, 2); 4735 } else { 4736 if (ifq2 == NULL) { 4737 if (nat->nat_pr[0] == IPPROTO_UDP) 4738 ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq : 4739 &softn->ipf_nat_udptq; 4740 else if (nat->nat_pr[0] == IPPROTO_ICMP || 4741 nat->nat_pr[0] == IPPROTO_ICMPV6) 4742 ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq: 4743 &softn->ipf_nat_icmptq; 4744 else 4745 ifq2 = &softn->ipf_nat_iptq; 4746 } 4747 4748 ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2); 4749 } 4750 } 4751 4752 4753 /* ------------------------------------------------------------------------ */ 4754 /* Function: ipf_nat_checkout */ 4755 /* Returns: int - -1 == packet failed NAT checks so block it, */ 4756 /* 0 == no packet translation occurred, */ 4757 /* 1 == packet was successfully translated. */ 4758 /* Parameters: fin(I) - pointer to packet information */ 4759 /* passp(I) - pointer to filtering result flags */ 4760 /* */ 4761 /* Check to see if an outcoming packet should be changed. ICMP packets are */ 4762 /* first checked to see if they match an existing entry (if an error), */ 4763 /* otherwise a search of the current NAT table is made. If neither results */ 4764 /* in a match then a search for a matching NAT rule is made. Create a new */ 4765 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 4766 /* packet header(s) as required. */ 4767 /* ------------------------------------------------------------------------ */ 4768 int 4769 ipf_nat_checkout(fr_info_t *fin, u_32_t *passp) 4770 { 4771 ipnat_t *np = NULL, *npnext; 4772 struct ifnet *ifp, *sifp; 4773 ipf_main_softc_t *softc; 4774 ipf_nat_softc_t *softn; 4775 tcphdr_t *tcp = NULL; 4776 int rval, natfailed; 4777 u_int nflags = 0; 4778 u_32_t ipa, iph; 4779 int natadd = 1; 4780 frentry_t *fr; 4781 nat_t *nat; 4782 4783 if (fin->fin_v == 6) { 4784 #ifdef USE_INET6 4785 return ipf_nat6_checkout(fin, passp); 4786 #else 4787 return 0; 4788 #endif 4789 } 4790 4791 softc = fin->fin_main_soft; 4792 softn = softc->ipf_nat_soft; 4793 4794 if (softn->ipf_nat_lock != 0) 4795 return 0; 4796 if (softn->ipf_nat_stats.ns_rules == 0 && 4797 softn->ipf_nat_instances == NULL) 4798 return 0; 4799 4800 natfailed = 0; 4801 fr = fin->fin_fr; 4802 sifp = fin->fin_ifp; 4803 if (fr != NULL) { 4804 ifp = fr->fr_tifs[fin->fin_rev].fd_ptr; 4805 if ((ifp != NULL) && (ifp != (void *)-1)) 4806 fin->fin_ifp = ifp; 4807 } 4808 ifp = fin->fin_ifp; 4809 4810 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 4811 switch (fin->fin_p) 4812 { 4813 case IPPROTO_TCP : 4814 nflags = IPN_TCP; 4815 break; 4816 case IPPROTO_UDP : 4817 nflags = IPN_UDP; 4818 break; 4819 case IPPROTO_ICMP : 4820 4821 /* 4822 * This is an incoming packet, so the destination is 4823 * the icmp_id and the source port equals 0 4824 */ 4825 if ((fin->fin_flx & FI_ICMPQUERY) != 0) 4826 nflags = IPN_ICMPQUERY; 4827 break; 4828 default : 4829 break; 4830 } 4831 4832 if ((nflags & IPN_TCPUDP)) 4833 tcp = fin->fin_dp; 4834 } 4835 4836 ipa = fin->fin_saddr; 4837 4838 READ_ENTER(&softc->ipf_nat); 4839 4840 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 4841 (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND))) 4842 /*EMPTY*/; 4843 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 4844 natadd = 0; 4845 else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH, 4846 (u_int)fin->fin_p, fin->fin_src, 4847 fin->fin_dst))) { 4848 nflags = nat->nat_flags; 4849 } else if (fin->fin_off == 0) { 4850 u_32_t hv, msk, nmsk = 0; 4851 4852 /* 4853 * If there is no current entry in the nat table for this IP#, 4854 * create one for it (if there is a matching rule). 4855 */ 4856 maskloop: 4857 msk = softn->ipf_nat_map_active_masks[nmsk]; 4858 iph = ipa & msk; 4859 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz); 4860 retry_roundrobin: 4861 for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) { 4862 npnext = np->in_mnext; 4863 if ((np->in_ifps[1] && (np->in_ifps[1] != ifp))) 4864 continue; 4865 if (np->in_v[0] != 4) 4866 continue; 4867 if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p)) 4868 continue; 4869 if ((np->in_flags & IPN_RF) && 4870 !(np->in_flags & nflags)) 4871 continue; 4872 if (np->in_flags & IPN_FILTER) { 4873 switch (ipf_nat_match(fin, np)) 4874 { 4875 case 0 : 4876 continue; 4877 case -1 : 4878 rval = -1; 4879 goto outmatchfail; 4880 case 1 : 4881 default : 4882 break; 4883 } 4884 } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr) 4885 continue; 4886 4887 if ((fr != NULL) && 4888 !ipf_matchtag(&np->in_tag, &fr->fr_nattag)) 4889 continue; 4890 4891 if (np->in_plabel != -1) { 4892 if (((np->in_flags & IPN_FILTER) == 0) && 4893 (np->in_odport != fin->fin_data[1])) 4894 continue; 4895 if (ipf_proxy_ok(fin, tcp, np) == 0) 4896 continue; 4897 } 4898 4899 if (np->in_flags & IPN_NO) { 4900 np->in_hits++; 4901 break; 4902 } 4903 MUTEX_ENTER(&softn->ipf_nat_new); 4904 /* 4905 * If we've matched a round-robin rule but it has 4906 * moved in the list since we got it, start over as 4907 * this is now no longer correct. 4908 */ 4909 if (npnext != np->in_mnext) { 4910 if ((np->in_flags & IPN_ROUNDR) != 0) { 4911 MUTEX_EXIT(&softn->ipf_nat_new); 4912 goto retry_roundrobin; 4913 } 4914 npnext = np->in_mnext; 4915 } 4916 4917 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND); 4918 MUTEX_EXIT(&softn->ipf_nat_new); 4919 if (nat != NULL) { 4920 natfailed = 0; 4921 break; 4922 } 4923 natfailed = -1; 4924 } 4925 if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) { 4926 nmsk++; 4927 goto maskloop; 4928 } 4929 } 4930 4931 if (nat != NULL) { 4932 rval = ipf_nat_out(fin, nat, natadd, nflags); 4933 if (rval == 1) { 4934 MUTEX_ENTER(&nat->nat_lock); 4935 ipf_nat_update(fin, nat); 4936 nat->nat_bytes[1] += fin->fin_plen; 4937 nat->nat_pkts[1]++; 4938 fin->fin_pktnum = nat->nat_pkts[1]; 4939 MUTEX_EXIT(&nat->nat_lock); 4940 } 4941 } else 4942 rval = natfailed; 4943 outmatchfail: 4944 RWLOCK_EXIT(&softc->ipf_nat); 4945 4946 switch (rval) 4947 { 4948 case -1 : 4949 if (passp != NULL) { 4950 DT1(frb_natv4out, fr_info_t *, fin); 4951 NBUMPSIDED(1, ns_drop); 4952 *passp = FR_BLOCK; 4953 fin->fin_reason = FRB_NATV4; 4954 } 4955 fin->fin_flx |= FI_BADNAT; 4956 NBUMPSIDED(1, ns_badnat); 4957 break; 4958 case 0 : 4959 NBUMPSIDE(1, ns_ignored); 4960 break; 4961 case 1 : 4962 NBUMPSIDE(1, ns_translated); 4963 break; 4964 } 4965 fin->fin_ifp = sifp; 4966 return rval; 4967 } 4968 4969 /* ------------------------------------------------------------------------ */ 4970 /* Function: ipf_nat_out */ 4971 /* Returns: int - -1 == packet failed NAT checks so block it, */ 4972 /* 1 == packet was successfully translated. */ 4973 /* Parameters: fin(I) - pointer to packet information */ 4974 /* nat(I) - pointer to NAT structure */ 4975 /* natadd(I) - flag indicating if it is safe to add frag cache */ 4976 /* nflags(I) - NAT flags set for this packet */ 4977 /* */ 4978 /* Translate a packet coming "out" on an interface. */ 4979 /* ------------------------------------------------------------------------ */ 4980 int 4981 ipf_nat_out(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) 4982 { 4983 ipf_main_softc_t *softc = fin->fin_main_soft; 4984 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4985 icmphdr_t *icmp; 4986 tcphdr_t *tcp; 4987 ipnat_t *np; 4988 int skip; 4989 int i; 4990 4991 tcp = NULL; 4992 icmp = NULL; 4993 np = nat->nat_ptr; 4994 4995 if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL)) 4996 (void) ipf_frag_natnew(softc, fin, 0, nat); 4997 4998 /* 4999 * Fix up checksums, not by recalculating them, but 5000 * simply computing adjustments. 5001 * This is only done for STREAMS based IP implementations where the 5002 * checksum has already been calculated by IP. In all other cases, 5003 * IPFilter is called before the checksum needs calculating so there 5004 * is no call to modify whatever is in the header now. 5005 */ 5006 if (nflags == IPN_ICMPERR) { 5007 u_32_t s1, s2, sumd, msumd; 5008 5009 s1 = LONG_SUM(ntohl(fin->fin_saddr)); 5010 if (nat->nat_dir == NAT_OUTBOUND) { 5011 s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 5012 } else { 5013 s2 = LONG_SUM(ntohl(nat->nat_odstaddr)); 5014 } 5015 CALC_SUMD(s1, s2, sumd); 5016 msumd = sumd; 5017 5018 s1 = LONG_SUM(ntohl(fin->fin_daddr)); 5019 if (nat->nat_dir == NAT_OUTBOUND) { 5020 s2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 5021 } else { 5022 s2 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 5023 } 5024 CALC_SUMD(s1, s2, sumd); 5025 msumd += sumd; 5026 5027 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0); 5028 } 5029 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5030 defined(linux) || defined(BRIDGE_IPF) 5031 else { 5032 /* 5033 * Strictly speaking, this isn't necessary on BSD 5034 * kernels because they do checksum calculation after 5035 * this code has run BUT if ipfilter is being used 5036 * to do NAT as a bridge, that code doesn't exist. 5037 */ 5038 switch (nat->nat_dir) 5039 { 5040 case NAT_OUTBOUND : 5041 ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART, 5042 &fin->fin_ip->ip_sum, 5043 nat->nat_ipsumd, 0); 5044 break; 5045 5046 case NAT_INBOUND : 5047 ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART, 5048 &fin->fin_ip->ip_sum, 5049 nat->nat_ipsumd, 0); 5050 break; 5051 5052 default : 5053 break; 5054 } 5055 } 5056 #endif 5057 5058 /* 5059 * Address assignment is after the checksum modification because 5060 * we are using the address in the packet for determining the 5061 * correct checksum offset (the ICMP error could be coming from 5062 * anyone...) 5063 */ 5064 switch (nat->nat_dir) 5065 { 5066 case NAT_OUTBOUND : 5067 fin->fin_ip->ip_src = nat->nat_nsrcip; 5068 fin->fin_saddr = nat->nat_nsrcaddr; 5069 fin->fin_ip->ip_dst = nat->nat_ndstip; 5070 fin->fin_daddr = nat->nat_ndstaddr; 5071 break; 5072 5073 case NAT_INBOUND : 5074 fin->fin_ip->ip_src = nat->nat_odstip; 5075 fin->fin_saddr = nat->nat_ndstaddr; 5076 fin->fin_ip->ip_dst = nat->nat_osrcip; 5077 fin->fin_daddr = nat->nat_nsrcaddr; 5078 break; 5079 5080 case NAT_DIVERTIN : 5081 { 5082 mb_t *m; 5083 5084 skip = ipf_nat_decap(fin, nat); 5085 if (skip <= 0) { 5086 NBUMPSIDED(1, ns_decap_fail); 5087 return -1; 5088 } 5089 5090 m = fin->fin_m; 5091 5092 #if defined(MENTAT) && defined(_KERNEL) 5093 m->b_rptr += skip; 5094 #else 5095 m->m_data += skip; 5096 m->m_len -= skip; 5097 5098 # ifdef M_PKTHDR 5099 if (m->m_flags & M_PKTHDR) 5100 m->m_pkthdr.len -= skip; 5101 # endif 5102 #endif 5103 5104 MUTEX_ENTER(&nat->nat_lock); 5105 ipf_nat_update(fin, nat); 5106 MUTEX_EXIT(&nat->nat_lock); 5107 fin->fin_flx |= FI_NATED; 5108 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5109 fin->fin_nattag = &np->in_tag; 5110 return 1; 5111 /* NOTREACHED */ 5112 } 5113 5114 case NAT_DIVERTOUT : 5115 { 5116 u_32_t s1, s2, sumd; 5117 udphdr_t *uh; 5118 ip_t *ip; 5119 mb_t *m; 5120 5121 m = M_DUP(np->in_divmp); 5122 if (m == NULL) { 5123 NBUMPSIDED(1, ns_divert_dup); 5124 return -1; 5125 } 5126 5127 ip = MTOD(m, ip_t *); 5128 ip->ip_id = htons(ipf_nextipid(fin)); 5129 s2 = ntohs(ip->ip_id); 5130 5131 s1 = ip->ip_len; 5132 ip->ip_len = ntohs(ip->ip_len); 5133 ip->ip_len += fin->fin_plen; 5134 ip->ip_len = htons(ip->ip_len); 5135 s2 += ntohs(ip->ip_len); 5136 CALC_SUMD(s1, s2, sumd); 5137 5138 uh = (udphdr_t *)(ip + 1); 5139 uh->uh_ulen += fin->fin_plen; 5140 uh->uh_ulen = htons(uh->uh_ulen); 5141 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5142 defined(linux) || defined(BRIDGE_IPF) 5143 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5144 #endif 5145 5146 PREP_MB_T(fin, m); 5147 5148 fin->fin_src = ip->ip_src; 5149 fin->fin_dst = ip->ip_dst; 5150 fin->fin_ip = ip; 5151 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5152 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5153 5154 nflags &= ~IPN_TCPUDPICMP; 5155 5156 break; 5157 } 5158 5159 default : 5160 break; 5161 } 5162 5163 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5164 u_short *csump; 5165 5166 if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) { 5167 tcp = fin->fin_dp; 5168 5169 switch (nat->nat_dir) 5170 { 5171 case NAT_OUTBOUND : 5172 tcp->th_sport = nat->nat_nsport; 5173 fin->fin_data[0] = ntohs(nat->nat_nsport); 5174 tcp->th_dport = nat->nat_ndport; 5175 fin->fin_data[1] = ntohs(nat->nat_ndport); 5176 break; 5177 5178 case NAT_INBOUND : 5179 tcp->th_sport = nat->nat_odport; 5180 fin->fin_data[0] = ntohs(nat->nat_odport); 5181 tcp->th_dport = nat->nat_osport; 5182 fin->fin_data[1] = ntohs(nat->nat_osport); 5183 break; 5184 } 5185 } 5186 5187 if ((nat->nat_nsport != 0) && (nflags & IPN_ICMPQUERY)) { 5188 icmp = fin->fin_dp; 5189 icmp->icmp_id = nat->nat_nicmpid; 5190 } 5191 5192 csump = ipf_nat_proto(fin, nat, nflags); 5193 5194 /* 5195 * The above comments do not hold for layer 4 (or higher) 5196 * checksums... 5197 */ 5198 if (csump != NULL) { 5199 if (nat->nat_dir == NAT_OUTBOUND) 5200 ipf_fix_outcksum(fin->fin_cksum, csump, 5201 nat->nat_sumd[0], 5202 nat->nat_sumd[1] + 5203 fin->fin_dlen); 5204 else 5205 ipf_fix_incksum(fin->fin_cksum, csump, 5206 nat->nat_sumd[0], 5207 nat->nat_sumd[1] + 5208 fin->fin_dlen); 5209 } 5210 } 5211 5212 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5213 /* ------------------------------------------------------------- */ 5214 /* A few quick notes: */ 5215 /* Following are test conditions prior to calling the */ 5216 /* ipf_proxy_check routine. */ 5217 /* */ 5218 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5219 /* with a redirect rule, we attempt to match the packet's */ 5220 /* source port against in_dport, otherwise we'd compare the */ 5221 /* packet's destination. */ 5222 /* ------------------------------------------------------------- */ 5223 if ((np != NULL) && (np->in_apr != NULL)) { 5224 i = ipf_proxy_check(fin, nat); 5225 if (i == 0) { 5226 i = 1; 5227 } else if (i == -1) { 5228 NBUMPSIDED(1, ns_ipf_proxy_fail); 5229 } 5230 } else { 5231 i = 1; 5232 } 5233 fin->fin_flx |= FI_NATED; 5234 return i; 5235 } 5236 5237 5238 /* ------------------------------------------------------------------------ */ 5239 /* Function: ipf_nat_checkin */ 5240 /* Returns: int - -1 == packet failed NAT checks so block it, */ 5241 /* 0 == no packet translation occurred, */ 5242 /* 1 == packet was successfully translated. */ 5243 /* Parameters: fin(I) - pointer to packet information */ 5244 /* passp(I) - pointer to filtering result flags */ 5245 /* */ 5246 /* Check to see if an incoming packet should be changed. ICMP packets are */ 5247 /* first checked to see if they match an existing entry (if an error), */ 5248 /* otherwise a search of the current NAT table is made. If neither results */ 5249 /* in a match then a search for a matching NAT rule is made. Create a new */ 5250 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 5251 /* packet header(s) as required. */ 5252 /* ------------------------------------------------------------------------ */ 5253 int 5254 ipf_nat_checkin(fr_info_t *fin, u_32_t *passp) 5255 { 5256 ipf_main_softc_t *softc; 5257 ipf_nat_softc_t *softn; 5258 u_int nflags, natadd; 5259 ipnat_t *np, *npnext; 5260 int rval, natfailed; 5261 struct ifnet *ifp; 5262 struct in_addr in; 5263 icmphdr_t *icmp; 5264 tcphdr_t *tcp; 5265 u_short dport; 5266 nat_t *nat; 5267 u_32_t iph; 5268 5269 softc = fin->fin_main_soft; 5270 softn = softc->ipf_nat_soft; 5271 5272 if (softn->ipf_nat_lock != 0) 5273 return 0; 5274 if (softn->ipf_nat_stats.ns_rules == 0 && 5275 softn->ipf_nat_instances == NULL) 5276 return 0; 5277 5278 tcp = NULL; 5279 icmp = NULL; 5280 dport = 0; 5281 natadd = 1; 5282 nflags = 0; 5283 natfailed = 0; 5284 ifp = fin->fin_ifp; 5285 5286 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5287 switch (fin->fin_p) 5288 { 5289 case IPPROTO_TCP : 5290 nflags = IPN_TCP; 5291 break; 5292 case IPPROTO_UDP : 5293 nflags = IPN_UDP; 5294 break; 5295 case IPPROTO_ICMP : 5296 icmp = fin->fin_dp; 5297 5298 /* 5299 * This is an incoming packet, so the destination is 5300 * the icmp_id and the source port equals 0 5301 */ 5302 if ((fin->fin_flx & FI_ICMPQUERY) != 0) { 5303 nflags = IPN_ICMPQUERY; 5304 dport = icmp->icmp_id; 5305 } break; 5306 default : 5307 break; 5308 } 5309 5310 if ((nflags & IPN_TCPUDP)) { 5311 tcp = fin->fin_dp; 5312 dport = fin->fin_data[1]; 5313 } 5314 } 5315 5316 in = fin->fin_dst; 5317 5318 READ_ENTER(&softc->ipf_nat); 5319 5320 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 5321 (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND))) 5322 /*EMPTY*/; 5323 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 5324 natadd = 0; 5325 else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH, 5326 (u_int)fin->fin_p, 5327 fin->fin_src, in))) { 5328 nflags = nat->nat_flags; 5329 } else if (fin->fin_off == 0) { 5330 u_32_t hv, msk, rmsk = 0; 5331 5332 /* 5333 * If there is no current entry in the nat table for this IP#, 5334 * create one for it (if there is a matching rule). 5335 */ 5336 maskloop: 5337 msk = softn->ipf_nat_rdr_active_masks[rmsk]; 5338 iph = in.s_addr & msk; 5339 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz); 5340 retry_roundrobin: 5341 /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */ 5342 for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) { 5343 npnext = np->in_rnext; 5344 if (np->in_ifps[0] && (np->in_ifps[0] != ifp)) 5345 continue; 5346 if (np->in_v[0] != 4) 5347 continue; 5348 if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p)) 5349 continue; 5350 if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags)) 5351 continue; 5352 if (np->in_flags & IPN_FILTER) { 5353 switch (ipf_nat_match(fin, np)) 5354 { 5355 case 0 : 5356 continue; 5357 case -1 : 5358 rval = -1; 5359 goto inmatchfail; 5360 case 1 : 5361 default : 5362 break; 5363 } 5364 } else { 5365 if ((in.s_addr & np->in_odstmsk) != 5366 np->in_odstaddr) 5367 continue; 5368 if (np->in_odport && 5369 ((np->in_dtop < dport) || 5370 (dport < np->in_odport))) 5371 continue; 5372 } 5373 5374 if (np->in_plabel != -1) { 5375 if (!ipf_proxy_ok(fin, tcp, np)) { 5376 continue; 5377 } 5378 } 5379 5380 if (np->in_flags & IPN_NO) { 5381 np->in_hits++; 5382 break; 5383 } 5384 5385 MUTEX_ENTER(&softn->ipf_nat_new); 5386 /* 5387 * If we've matched a round-robin rule but it has 5388 * moved in the list since we got it, start over as 5389 * this is now no longer correct. 5390 */ 5391 if (npnext != np->in_rnext) { 5392 if ((np->in_flags & IPN_ROUNDR) != 0) { 5393 MUTEX_EXIT(&softn->ipf_nat_new); 5394 goto retry_roundrobin; 5395 } 5396 npnext = np->in_rnext; 5397 } 5398 5399 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND); 5400 MUTEX_EXIT(&softn->ipf_nat_new); 5401 if (nat != NULL) { 5402 natfailed = 0; 5403 break; 5404 } 5405 natfailed = -1; 5406 } 5407 if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) { 5408 rmsk++; 5409 goto maskloop; 5410 } 5411 } 5412 5413 if (nat != NULL) { 5414 rval = ipf_nat_in(fin, nat, natadd, nflags); 5415 if (rval == 1) { 5416 MUTEX_ENTER(&nat->nat_lock); 5417 ipf_nat_update(fin, nat); 5418 nat->nat_bytes[0] += fin->fin_plen; 5419 nat->nat_pkts[0]++; 5420 fin->fin_pktnum = nat->nat_pkts[0]; 5421 MUTEX_EXIT(&nat->nat_lock); 5422 } 5423 } else 5424 rval = natfailed; 5425 inmatchfail: 5426 RWLOCK_EXIT(&softc->ipf_nat); 5427 5428 switch (rval) 5429 { 5430 case -1 : 5431 if (passp != NULL) { 5432 DT1(frb_natv4in, fr_info_t *, fin); 5433 NBUMPSIDED(0, ns_drop); 5434 *passp = FR_BLOCK; 5435 fin->fin_reason = FRB_NATV4; 5436 } 5437 fin->fin_flx |= FI_BADNAT; 5438 NBUMPSIDED(0, ns_badnat); 5439 break; 5440 case 0 : 5441 NBUMPSIDE(0, ns_ignored); 5442 break; 5443 case 1 : 5444 NBUMPSIDE(0, ns_translated); 5445 break; 5446 } 5447 return rval; 5448 } 5449 5450 5451 /* ------------------------------------------------------------------------ */ 5452 /* Function: ipf_nat_in */ 5453 /* Returns: int - -1 == packet failed NAT checks so block it, */ 5454 /* 1 == packet was successfully translated. */ 5455 /* Parameters: fin(I) - pointer to packet information */ 5456 /* nat(I) - pointer to NAT structure */ 5457 /* natadd(I) - flag indicating if it is safe to add frag cache */ 5458 /* nflags(I) - NAT flags set for this packet */ 5459 /* Locks Held: ipf_nat(READ) */ 5460 /* */ 5461 /* Translate a packet coming "in" on an interface. */ 5462 /* ------------------------------------------------------------------------ */ 5463 int 5464 ipf_nat_in(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) 5465 { 5466 ipf_main_softc_t *softc = fin->fin_main_soft; 5467 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5468 u_32_t sumd, ipsumd, sum1, sum2; 5469 icmphdr_t *icmp; 5470 tcphdr_t *tcp; 5471 ipnat_t *np; 5472 int skip; 5473 int i; 5474 5475 tcp = NULL; 5476 np = nat->nat_ptr; 5477 fin->fin_fr = nat->nat_fr; 5478 5479 if (np != NULL) { 5480 if ((natadd != 0) && (fin->fin_flx & FI_FRAG)) 5481 (void) ipf_frag_natnew(softc, fin, 0, nat); 5482 5483 /* ------------------------------------------------------------- */ 5484 /* A few quick notes: */ 5485 /* Following are test conditions prior to calling the */ 5486 /* ipf_proxy_check routine. */ 5487 /* */ 5488 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5489 /* with a map rule, we attempt to match the packet's */ 5490 /* source port against in_dport, otherwise we'd compare the */ 5491 /* packet's destination. */ 5492 /* ------------------------------------------------------------- */ 5493 if (np->in_apr != NULL) { 5494 i = ipf_proxy_check(fin, nat); 5495 if (i == -1) { 5496 NBUMPSIDED(0, ns_ipf_proxy_fail); 5497 return -1; 5498 } 5499 } 5500 } 5501 5502 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5503 5504 ipsumd = nat->nat_ipsumd; 5505 /* 5506 * Fix up checksums, not by recalculating them, but 5507 * simply computing adjustments. 5508 * Why only do this for some platforms on inbound packets ? 5509 * Because for those that it is done, IP processing is yet to happen 5510 * and so the IPv4 header checksum has not yet been evaluated. 5511 * Perhaps it should always be done for the benefit of things like 5512 * fast forwarding (so that it doesn't need to be recomputed) but with 5513 * header checksum offloading, perhaps it is a moot point. 5514 */ 5515 5516 switch (nat->nat_dir) 5517 { 5518 case NAT_INBOUND : 5519 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5520 fin->fin_ip->ip_src = nat->nat_nsrcip; 5521 fin->fin_saddr = nat->nat_nsrcaddr; 5522 } else { 5523 sum1 = nat->nat_osrcaddr; 5524 sum2 = nat->nat_nsrcaddr; 5525 CALC_SUMD(sum1, sum2, sumd); 5526 ipsumd -= sumd; 5527 } 5528 fin->fin_ip->ip_dst = nat->nat_ndstip; 5529 fin->fin_daddr = nat->nat_ndstaddr; 5530 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5531 defined(__osf__) || defined(linux) 5532 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5533 #endif 5534 break; 5535 5536 case NAT_OUTBOUND : 5537 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5538 fin->fin_ip->ip_src = nat->nat_odstip; 5539 fin->fin_saddr = nat->nat_odstaddr; 5540 } else { 5541 sum1 = nat->nat_odstaddr; 5542 sum2 = nat->nat_ndstaddr; 5543 CALC_SUMD(sum1, sum2, sumd); 5544 ipsumd -= sumd; 5545 } 5546 fin->fin_ip->ip_dst = nat->nat_osrcip; 5547 fin->fin_daddr = nat->nat_osrcaddr; 5548 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5549 defined(__osf__) || defined(linux) 5550 ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5551 #endif 5552 break; 5553 5554 case NAT_DIVERTIN : 5555 { 5556 udphdr_t *uh; 5557 ip_t *ip; 5558 mb_t *m; 5559 5560 m = M_DUP(np->in_divmp); 5561 if (m == NULL) { 5562 NBUMPSIDED(0, ns_divert_dup); 5563 return -1; 5564 } 5565 5566 ip = MTOD(m, ip_t *); 5567 ip->ip_id = htons(ipf_nextipid(fin)); 5568 sum1 = ntohs(ip->ip_len); 5569 ip->ip_len = ntohs(ip->ip_len); 5570 ip->ip_len += fin->fin_plen; 5571 ip->ip_len = htons(ip->ip_len); 5572 5573 uh = (udphdr_t *)(ip + 1); 5574 uh->uh_ulen += fin->fin_plen; 5575 uh->uh_ulen = htons(uh->uh_ulen); 5576 5577 sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len); 5578 sum2 += ntohs(ip->ip_off) & IP_DF; 5579 CALC_SUMD(sum1, sum2, sumd); 5580 5581 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5582 defined(__osf__) || defined(linux) 5583 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5584 #endif 5585 PREP_MB_T(fin, m); 5586 5587 fin->fin_ip = ip; 5588 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */ 5589 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */ 5590 5591 nflags &= ~IPN_TCPUDPICMP; 5592 5593 break; 5594 } 5595 5596 case NAT_DIVERTOUT : 5597 { 5598 mb_t *m; 5599 5600 skip = ipf_nat_decap(fin, nat); 5601 if (skip <= 0) { 5602 NBUMPSIDED(0, ns_decap_fail); 5603 return -1; 5604 } 5605 5606 m = fin->fin_m; 5607 5608 #if defined(MENTAT) && defined(_KERNEL) 5609 m->b_rptr += skip; 5610 #else 5611 m->m_data += skip; 5612 m->m_len -= skip; 5613 5614 # ifdef M_PKTHDR 5615 if (m->m_flags & M_PKTHDR) 5616 m->m_pkthdr.len -= skip; 5617 # endif 5618 #endif 5619 5620 ipf_nat_update(fin, nat); 5621 nflags &= ~IPN_TCPUDPICMP; 5622 fin->fin_flx |= FI_NATED; 5623 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5624 fin->fin_nattag = &np->in_tag; 5625 return 1; 5626 /* NOTREACHED */ 5627 } 5628 } 5629 if (nflags & IPN_TCPUDP) 5630 tcp = fin->fin_dp; 5631 5632 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5633 u_short *csump; 5634 5635 if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) { 5636 switch (nat->nat_dir) 5637 { 5638 case NAT_INBOUND : 5639 tcp->th_sport = nat->nat_nsport; 5640 fin->fin_data[0] = ntohs(nat->nat_nsport); 5641 tcp->th_dport = nat->nat_ndport; 5642 fin->fin_data[1] = ntohs(nat->nat_ndport); 5643 break; 5644 5645 case NAT_OUTBOUND : 5646 tcp->th_sport = nat->nat_odport; 5647 fin->fin_data[0] = ntohs(nat->nat_odport); 5648 tcp->th_dport = nat->nat_osport; 5649 fin->fin_data[1] = ntohs(nat->nat_osport); 5650 break; 5651 } 5652 } 5653 5654 5655 if ((nat->nat_odport != 0) && (nflags & IPN_ICMPQUERY)) { 5656 icmp = fin->fin_dp; 5657 5658 icmp->icmp_id = nat->nat_nicmpid; 5659 } 5660 5661 csump = ipf_nat_proto(fin, nat, nflags); 5662 5663 /* 5664 * The above comments do not hold for layer 4 (or higher) 5665 * checksums... 5666 */ 5667 if (csump != NULL) { 5668 if (nat->nat_dir == NAT_OUTBOUND) 5669 ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0); 5670 else 5671 ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0); 5672 } 5673 } 5674 5675 fin->fin_flx |= FI_NATED; 5676 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5677 fin->fin_nattag = &np->in_tag; 5678 return 1; 5679 } 5680 5681 5682 /* ------------------------------------------------------------------------ */ 5683 /* Function: ipf_nat_proto */ 5684 /* Returns: u_short* - pointer to transport header checksum to update, */ 5685 /* NULL if the transport protocol is not recognised */ 5686 /* as needing a checksum update. */ 5687 /* Parameters: fin(I) - pointer to packet information */ 5688 /* nat(I) - pointer to NAT structure */ 5689 /* nflags(I) - NAT flags set for this packet */ 5690 /* */ 5691 /* Return the pointer to the checksum field for each protocol so understood.*/ 5692 /* If support for making other changes to a protocol header is required, */ 5693 /* that is not strictly 'address' translation, such as clamping the MSS in */ 5694 /* TCP down to a specific value, then do it from here. */ 5695 /* ------------------------------------------------------------------------ */ 5696 u_short * 5697 ipf_nat_proto(fr_info_t *fin, nat_t *nat, u_int nflags) 5698 { 5699 icmphdr_t *icmp; 5700 u_short *csump; 5701 tcphdr_t *tcp; 5702 udphdr_t *udp; 5703 5704 csump = NULL; 5705 if (fin->fin_out == 0) { 5706 fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND); 5707 } else { 5708 fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0); 5709 } 5710 5711 switch (fin->fin_p) 5712 { 5713 case IPPROTO_TCP : 5714 tcp = fin->fin_dp; 5715 5716 if ((nflags & IPN_TCP) != 0) 5717 csump = &tcp->th_sum; 5718 5719 /* 5720 * Do a MSS CLAMPING on a SYN packet, 5721 * only deal IPv4 for now. 5722 */ 5723 if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0) 5724 ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump); 5725 5726 break; 5727 5728 case IPPROTO_UDP : 5729 udp = fin->fin_dp; 5730 5731 if ((nflags & IPN_UDP) != 0) { 5732 if (udp->uh_sum != 0) 5733 csump = &udp->uh_sum; 5734 } 5735 break; 5736 5737 case IPPROTO_ICMP : 5738 icmp = fin->fin_dp; 5739 5740 if ((nflags & IPN_ICMPQUERY) != 0) { 5741 if (icmp->icmp_cksum != 0) 5742 csump = &icmp->icmp_cksum; 5743 } 5744 break; 5745 5746 #ifdef USE_INET6 5747 case IPPROTO_ICMPV6 : 5748 { 5749 struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp; 5750 5751 icmp6 = fin->fin_dp; 5752 5753 if ((nflags & IPN_ICMPQUERY) != 0) { 5754 if (icmp6->icmp6_cksum != 0) 5755 csump = &icmp6->icmp6_cksum; 5756 } 5757 break; 5758 } 5759 #endif 5760 } 5761 return csump; 5762 } 5763 5764 5765 /* ------------------------------------------------------------------------ */ 5766 /* Function: ipf_nat_expire */ 5767 /* Returns: Nil */ 5768 /* Parameters: softc(I) - pointer to soft context main structure */ 5769 /* */ 5770 /* Check all of the timeout queues for entries at the top which need to be */ 5771 /* expired. */ 5772 /* ------------------------------------------------------------------------ */ 5773 void 5774 ipf_nat_expire(ipf_main_softc_t *softc) 5775 { 5776 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5777 ipftq_t *ifq, *ifqnext; 5778 ipftqent_t *tqe, *tqn; 5779 int i; 5780 SPL_INT(s); 5781 5782 SPL_NET(s); 5783 WRITE_ENTER(&softc->ipf_nat); 5784 for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL; 5785 ifq = ifq->ifq_next) { 5786 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5787 if (tqe->tqe_die > softc->ipf_ticks) 5788 break; 5789 tqn = tqe->tqe_next; 5790 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5791 } 5792 } 5793 5794 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) { 5795 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5796 if (tqe->tqe_die > softc->ipf_ticks) 5797 break; 5798 tqn = tqe->tqe_next; 5799 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5800 } 5801 } 5802 5803 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 5804 ifqnext = ifq->ifq_next; 5805 5806 if (((ifq->ifq_flags & IFQF_DELETE) != 0) && 5807 (ifq->ifq_ref == 0)) { 5808 ipf_freetimeoutqueue(softc, ifq); 5809 } 5810 } 5811 5812 if (softn->ipf_nat_doflush != 0) { 5813 ipf_nat_extraflush(softc, softn, 2); 5814 softn->ipf_nat_doflush = 0; 5815 } 5816 5817 RWLOCK_EXIT(&softc->ipf_nat); 5818 SPL_X(s); 5819 } 5820 5821 5822 /* ------------------------------------------------------------------------ */ 5823 /* Function: ipf_nat_sync */ 5824 /* Returns: Nil */ 5825 /* Parameters: softc(I) - pointer to soft context main structure */ 5826 /* ifp(I) - pointer to network interface */ 5827 /* */ 5828 /* Walk through all of the currently active NAT sessions, looking for those */ 5829 /* which need to have their translated address updated. */ 5830 /* ------------------------------------------------------------------------ */ 5831 void 5832 ipf_nat_sync(ipf_main_softc_t *softc, void *ifp) 5833 { 5834 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5835 u_32_t sum1, sum2, sumd; 5836 i6addr_t in; 5837 ipnat_t *n; 5838 nat_t *nat; 5839 void *ifp2; 5840 int idx; 5841 SPL_INT(s); 5842 5843 if (softc->ipf_running <= 0) 5844 return; 5845 5846 /* 5847 * Change IP addresses for NAT sessions for any protocol except TCP 5848 * since it will break the TCP connection anyway. The only rules 5849 * which will get changed are those which are "map ... -> 0/32", 5850 * where the rule specifies the address is taken from the interface. 5851 */ 5852 SPL_NET(s); 5853 WRITE_ENTER(&softc->ipf_nat); 5854 5855 if (softc->ipf_running <= 0) { 5856 RWLOCK_EXIT(&softc->ipf_nat); 5857 return; 5858 } 5859 5860 for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) { 5861 if ((nat->nat_flags & IPN_TCP) != 0) 5862 continue; 5863 5864 n = nat->nat_ptr; 5865 if (n != NULL) { 5866 if (n->in_v[1] == 4) { 5867 if (n->in_redir & NAT_MAP) { 5868 if ((n->in_nsrcaddr != 0) || 5869 (n->in_nsrcmsk != 0xffffffff)) 5870 continue; 5871 } else if (n->in_redir & NAT_REDIRECT) { 5872 if ((n->in_ndstaddr != 0) || 5873 (n->in_ndstmsk != 0xffffffff)) 5874 continue; 5875 } 5876 } 5877 #ifdef USE_INET6 5878 if (n->in_v[1] == 4) { 5879 if (n->in_redir & NAT_MAP) { 5880 if (!IP6_ISZERO(&n->in_nsrcaddr) || 5881 !IP6_ISONES(&n->in_nsrcmsk)) 5882 continue; 5883 } else if (n->in_redir & NAT_REDIRECT) { 5884 if (!IP6_ISZERO(&n->in_ndstaddr) || 5885 !IP6_ISONES(&n->in_ndstmsk)) 5886 continue; 5887 } 5888 } 5889 #endif 5890 } 5891 5892 if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) || 5893 (ifp == nat->nat_ifps[1]))) { 5894 nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0], 5895 nat->nat_v[0]); 5896 if ((nat->nat_ifps[0] != NULL) && 5897 (nat->nat_ifps[0] != (void *)-1)) { 5898 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 5899 } 5900 if (nat->nat_ifnames[1][0] != '\0') { 5901 nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1], 5902 nat->nat_v[1]); 5903 } else { 5904 nat->nat_ifps[1] = nat->nat_ifps[0]; 5905 } 5906 if ((nat->nat_ifps[1] != NULL) && 5907 (nat->nat_ifps[1] != (void *)-1)) { 5908 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 5909 } 5910 ifp2 = nat->nat_ifps[0]; 5911 if (ifp2 == NULL) 5912 continue; 5913 5914 /* 5915 * Change the map-to address to be the same as the 5916 * new one. 5917 */ 5918 sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 5919 if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2, 5920 &in, NULL) != -1) { 5921 if (nat->nat_v[0] == 4) 5922 nat->nat_nsrcip = in.in4; 5923 } 5924 sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 5925 5926 if (sum1 == sum2) 5927 continue; 5928 /* 5929 * Readjust the checksum adjustment to take into 5930 * account the new IP#. 5931 */ 5932 CALC_SUMD(sum1, sum2, sumd); 5933 /* XXX - dont change for TCP when solaris does 5934 * hardware checksumming. 5935 */ 5936 sumd += nat->nat_sumd[0]; 5937 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 5938 nat->nat_sumd[1] = nat->nat_sumd[0]; 5939 } 5940 } 5941 5942 for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) { 5943 char *base = n->in_names; 5944 5945 if ((ifp == NULL) || (n->in_ifps[0] == ifp)) 5946 n->in_ifps[0] = ipf_resolvenic(softc, 5947 base + n->in_ifnames[0], 5948 n->in_v[0]); 5949 if ((ifp == NULL) || (n->in_ifps[1] == ifp)) 5950 n->in_ifps[1] = ipf_resolvenic(softc, 5951 base + n->in_ifnames[1], 5952 n->in_v[1]); 5953 5954 if (n->in_redir & NAT_REDIRECT) 5955 idx = 1; 5956 else 5957 idx = 0; 5958 5959 if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) && 5960 (n->in_ifps[idx] != NULL && 5961 n->in_ifps[idx] != (void *)-1)) { 5962 5963 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 5964 0, n->in_ifps[idx]); 5965 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 5966 0, n->in_ifps[idx]); 5967 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 5968 0, n->in_ifps[idx]); 5969 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 5970 0, n->in_ifps[idx]); 5971 } 5972 } 5973 RWLOCK_EXIT(&softc->ipf_nat); 5974 SPL_X(s); 5975 } 5976 5977 5978 /* ------------------------------------------------------------------------ */ 5979 /* Function: ipf_nat_icmpquerytype */ 5980 /* Returns: int - 1 == success, 0 == failure */ 5981 /* Parameters: icmptype(I) - ICMP type number */ 5982 /* */ 5983 /* Tests to see if the ICMP type number passed is a query/response type or */ 5984 /* not. */ 5985 /* ------------------------------------------------------------------------ */ 5986 static int 5987 ipf_nat_icmpquerytype(int icmptype) 5988 { 5989 5990 /* 5991 * For the ICMP query NAT code, it is essential that both the query 5992 * and the reply match on the NAT rule. Because the NAT structure 5993 * does not keep track of the icmptype, and a single NAT structure 5994 * is used for all icmp types with the same src, dest and id, we 5995 * simply define the replies as queries as well. The funny thing is, 5996 * although it seems silly to call a reply a query, this is exactly 5997 * as it is defined in the IPv4 specification 5998 */ 5999 switch (icmptype) 6000 { 6001 case ICMP_ECHOREPLY: 6002 case ICMP_ECHO: 6003 /* route aedvertisement/solliciation is currently unsupported: */ 6004 /* it would require rewriting the ICMP data section */ 6005 case ICMP_TSTAMP: 6006 case ICMP_TSTAMPREPLY: 6007 case ICMP_IREQ: 6008 case ICMP_IREQREPLY: 6009 case ICMP_MASKREQ: 6010 case ICMP_MASKREPLY: 6011 return 1; 6012 default: 6013 return 0; 6014 } 6015 } 6016 6017 6018 /* ------------------------------------------------------------------------ */ 6019 /* Function: nat_log */ 6020 /* Returns: Nil */ 6021 /* Parameters: softc(I) - pointer to soft context main structure */ 6022 /* softn(I) - pointer to NAT context structure */ 6023 /* nat(I) - pointer to NAT structure */ 6024 /* action(I) - action related to NAT structure being performed */ 6025 /* */ 6026 /* Creates a NAT log entry. */ 6027 /* ------------------------------------------------------------------------ */ 6028 void 6029 ipf_nat_log(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, struct nat *nat, 6030 u_int action) 6031 { 6032 #ifdef IPFILTER_LOG 6033 # ifndef LARGE_NAT 6034 struct ipnat *np; 6035 int rulen; 6036 # endif 6037 struct natlog natl; 6038 void *items[1]; 6039 size_t sizes[1]; 6040 int types[1]; 6041 6042 bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip, 6043 sizeof(natl.nl_osrcip)); 6044 bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip, 6045 sizeof(natl.nl_nsrcip)); 6046 bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip, 6047 sizeof(natl.nl_odstip)); 6048 bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip, 6049 sizeof(natl.nl_ndstip)); 6050 6051 natl.nl_bytes[0] = nat->nat_bytes[0]; 6052 natl.nl_bytes[1] = nat->nat_bytes[1]; 6053 natl.nl_pkts[0] = nat->nat_pkts[0]; 6054 natl.nl_pkts[1] = nat->nat_pkts[1]; 6055 natl.nl_odstport = nat->nat_odport; 6056 natl.nl_osrcport = nat->nat_osport; 6057 natl.nl_nsrcport = nat->nat_nsport; 6058 natl.nl_ndstport = nat->nat_ndport; 6059 natl.nl_p[0] = nat->nat_pr[0]; 6060 natl.nl_p[1] = nat->nat_pr[1]; 6061 natl.nl_v[0] = nat->nat_v[0]; 6062 natl.nl_v[1] = nat->nat_v[1]; 6063 natl.nl_type = nat->nat_redir; 6064 natl.nl_action = action; 6065 natl.nl_rule = -1; 6066 6067 bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0], 6068 sizeof(nat->nat_ifnames[0])); 6069 bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1], 6070 sizeof(nat->nat_ifnames[1])); 6071 6072 # ifndef LARGE_NAT 6073 if (nat->nat_ptr != NULL) { 6074 for (rulen = 0, np = softn->ipf_nat_list; np != NULL; 6075 np = np->in_next, rulen++) 6076 if (np == nat->nat_ptr) { 6077 natl.nl_rule = rulen; 6078 break; 6079 } 6080 } 6081 # endif 6082 items[0] = &natl; 6083 sizes[0] = sizeof(natl); 6084 types[0] = 0; 6085 6086 (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1); 6087 #endif 6088 } 6089 6090 6091 #if defined(__OpenBSD__) 6092 /* ------------------------------------------------------------------------ */ 6093 /* Function: ipf_nat_ifdetach */ 6094 /* Returns: Nil */ 6095 /* Parameters: ifp(I) - pointer to network interface */ 6096 /* */ 6097 /* Compatibility interface for OpenBSD to trigger the correct updating of */ 6098 /* interface references within IPFilter. */ 6099 /* ------------------------------------------------------------------------ */ 6100 void 6101 ipf_nat_ifdetach(ifp) 6102 void *ifp; 6103 { 6104 ipf_main_softc_t *softc; 6105 6106 softc = ipf_get_softc(0); 6107 6108 ipf_sync(ifp); 6109 return; 6110 } 6111 #endif 6112 6113 6114 /* ------------------------------------------------------------------------ */ 6115 /* Function: ipf_nat_rule_deref */ 6116 /* Returns: Nil */ 6117 /* Parameters: softc(I) - pointer to soft context main structure */ 6118 /* inp(I) - pointer to pointer to NAT rule */ 6119 /* Write Locks: ipf_nat */ 6120 /* */ 6121 /* Dropping the refernce count for a rule means that whatever held the */ 6122 /* pointer to this rule (*inp) is no longer interested in it and when the */ 6123 /* reference count drops to zero, any resources allocated for the rule can */ 6124 /* be released and the rule itself free'd. */ 6125 /* ------------------------------------------------------------------------ */ 6126 void 6127 ipf_nat_rule_deref(ipf_main_softc_t *softc, ipnat_t **inp) 6128 { 6129 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6130 ipnat_t *n; 6131 6132 n = *inp; 6133 *inp = NULL; 6134 n->in_use--; 6135 if (n->in_use > 0) 6136 return; 6137 6138 if (n->in_apr != NULL) 6139 ipf_proxy_deref(n->in_apr); 6140 6141 ipf_nat_rule_fini(softc, n); 6142 6143 if (n->in_redir & NAT_REDIRECT) { 6144 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6145 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr); 6146 } 6147 } 6148 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 6149 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6150 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map); 6151 } 6152 } 6153 6154 if (n->in_tqehead[0] != NULL) { 6155 if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) { 6156 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6157 } 6158 } 6159 6160 if (n->in_tqehead[1] != NULL) { 6161 if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) { 6162 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6163 } 6164 } 6165 6166 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6167 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules); 6168 } 6169 6170 MUTEX_DESTROY(&n->in_lock); 6171 6172 KFREES(n, n->in_size); 6173 6174 #if SOLARIS && !defined(INSTANCES) 6175 if (softn->ipf_nat_stats.ns_rules == 0) 6176 pfil_delayed_copy = 1; 6177 #endif 6178 } 6179 6180 6181 /* ------------------------------------------------------------------------ */ 6182 /* Function: ipf_nat_deref */ 6183 /* Returns: Nil */ 6184 /* Parameters: softc(I) - pointer to soft context main structure */ 6185 /* natp(I) - pointer to pointer to NAT table entry */ 6186 /* */ 6187 /* Decrement the reference counter for this NAT table entry and free it if */ 6188 /* there are no more things using it. */ 6189 /* */ 6190 /* IF nat_ref == 1 when this function is called, then we have an orphan nat */ 6191 /* structure *because* it only gets called on paths _after_ nat_ref has been*/ 6192 /* incremented. If nat_ref == 1 then we shouldn't decrement it here */ 6193 /* because nat_delete() will do that and send nat_ref to -1. */ 6194 /* */ 6195 /* Holding the lock on nat_lock is required to serialise nat_delete() being */ 6196 /* called from a NAT flush ioctl with a deref happening because of a packet.*/ 6197 /* ------------------------------------------------------------------------ */ 6198 void 6199 ipf_nat_deref(ipf_main_softc_t *softc, nat_t **natp) 6200 { 6201 nat_t *nat; 6202 6203 nat = *natp; 6204 *natp = NULL; 6205 6206 MUTEX_ENTER(&nat->nat_lock); 6207 if (nat->nat_ref > 1) { 6208 nat->nat_ref--; 6209 ASSERT(nat->nat_ref >= 0); 6210 MUTEX_EXIT(&nat->nat_lock); 6211 return; 6212 } 6213 MUTEX_EXIT(&nat->nat_lock); 6214 6215 WRITE_ENTER(&softc->ipf_nat); 6216 ipf_nat_delete(softc, nat, NL_EXPIRE); 6217 RWLOCK_EXIT(&softc->ipf_nat); 6218 } 6219 6220 6221 /* ------------------------------------------------------------------------ */ 6222 /* Function: ipf_nat_clone */ 6223 /* Returns: ipstate_t* - NULL == cloning failed, */ 6224 /* else pointer to new state structure */ 6225 /* Parameters: fin(I) - pointer to packet information */ 6226 /* is(I) - pointer to master state structure */ 6227 /* Write Lock: ipf_nat */ 6228 /* */ 6229 /* Create a "duplcate" state table entry from the master. */ 6230 /* ------------------------------------------------------------------------ */ 6231 nat_t * 6232 ipf_nat_clone(fr_info_t *fin, nat_t *nat) 6233 { 6234 ipf_main_softc_t *softc = fin->fin_main_soft; 6235 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6236 frentry_t *fr; 6237 nat_t *clone; 6238 ipnat_t *np; 6239 6240 KMALLOC(clone, nat_t *); 6241 if (clone == NULL) { 6242 NBUMPSIDED(fin->fin_out, ns_clone_nomem); 6243 return NULL; 6244 } 6245 bcopy((char *)nat, (char *)clone, sizeof(*clone)); 6246 6247 MUTEX_NUKE(&clone->nat_lock); 6248 6249 clone->nat_rev = fin->fin_rev; 6250 clone->nat_aps = NULL; 6251 /* 6252 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 6253 */ 6254 clone->nat_tqe.tqe_pnext = NULL; 6255 clone->nat_tqe.tqe_next = NULL; 6256 clone->nat_tqe.tqe_ifq = NULL; 6257 clone->nat_tqe.tqe_parent = clone; 6258 6259 clone->nat_flags &= ~SI_CLONE; 6260 clone->nat_flags |= SI_CLONED; 6261 6262 if (clone->nat_hm) 6263 clone->nat_hm->hm_ref++; 6264 6265 if (ipf_nat_insert(softc, softn, clone) == -1) { 6266 KFREE(clone); 6267 NBUMPSIDED(fin->fin_out, ns_insert_fail); 6268 return NULL; 6269 } 6270 6271 np = clone->nat_ptr; 6272 if (np != NULL) { 6273 if (softn->ipf_nat_logging) 6274 ipf_nat_log(softc, softn, clone, NL_CLONE); 6275 np->in_use++; 6276 } 6277 fr = clone->nat_fr; 6278 if (fr != NULL) { 6279 MUTEX_ENTER(&fr->fr_lock); 6280 fr->fr_ref++; 6281 MUTEX_EXIT(&fr->fr_lock); 6282 } 6283 6284 6285 /* 6286 * Because the clone is created outside the normal loop of things and 6287 * TCP has special needs in terms of state, initialise the timeout 6288 * state of the new NAT from here. 6289 */ 6290 if (clone->nat_pr[0] == IPPROTO_TCP) { 6291 (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq, 6292 clone->nat_flags, 2); 6293 } 6294 clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone); 6295 if (softn->ipf_nat_logging) 6296 ipf_nat_log(softc, softn, clone, NL_CLONE); 6297 return clone; 6298 } 6299 6300 6301 /* ------------------------------------------------------------------------ */ 6302 /* Function: ipf_nat_wildok */ 6303 /* Returns: int - 1 == packet's ports match wildcards */ 6304 /* 0 == packet's ports don't match wildcards */ 6305 /* Parameters: nat(I) - NAT entry */ 6306 /* sport(I) - source port */ 6307 /* dport(I) - destination port */ 6308 /* flags(I) - wildcard flags */ 6309 /* dir(I) - packet direction */ 6310 /* */ 6311 /* Use NAT entry and packet direction to determine which combination of */ 6312 /* wildcard flags should be used. */ 6313 /* ------------------------------------------------------------------------ */ 6314 int 6315 ipf_nat_wildok(nat_t *nat, int sport, int dport, int flags, int dir) 6316 { 6317 /* 6318 * When called by dir is set to 6319 * nat_inlookup NAT_INBOUND (0) 6320 * nat_outlookup NAT_OUTBOUND (1) 6321 * 6322 * We simply combine the packet's direction in dir with the original 6323 * "intended" direction of that NAT entry in nat->nat_dir to decide 6324 * which combination of wildcard flags to allow. 6325 */ 6326 switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))) 6327 { 6328 case 3: /* outbound packet / outbound entry */ 6329 if (((nat->nat_osport == sport) || 6330 (flags & SI_W_SPORT)) && 6331 ((nat->nat_odport == dport) || 6332 (flags & SI_W_DPORT))) 6333 return 1; 6334 break; 6335 case 2: /* outbound packet / inbound entry */ 6336 if (((nat->nat_osport == dport) || 6337 (flags & SI_W_SPORT)) && 6338 ((nat->nat_odport == sport) || 6339 (flags & SI_W_DPORT))) 6340 return 1; 6341 break; 6342 case 1: /* inbound packet / outbound entry */ 6343 if (((nat->nat_osport == dport) || 6344 (flags & SI_W_SPORT)) && 6345 ((nat->nat_odport == sport) || 6346 (flags & SI_W_DPORT))) 6347 return 1; 6348 break; 6349 case 0: /* inbound packet / inbound entry */ 6350 if (((nat->nat_osport == sport) || 6351 (flags & SI_W_SPORT)) && 6352 ((nat->nat_odport == dport) || 6353 (flags & SI_W_DPORT))) 6354 return 1; 6355 break; 6356 default: 6357 break; 6358 } 6359 6360 return(0); 6361 } 6362 6363 6364 /* ------------------------------------------------------------------------ */ 6365 /* Function: nat_mssclamp */ 6366 /* Returns: Nil */ 6367 /* Parameters: tcp(I) - pointer to TCP header */ 6368 /* maxmss(I) - value to clamp the TCP MSS to */ 6369 /* fin(I) - pointer to packet information */ 6370 /* csump(I) - pointer to TCP checksum */ 6371 /* */ 6372 /* Check for MSS option and clamp it if necessary. If found and changed, */ 6373 /* then the TCP header checksum will be updated to reflect the change in */ 6374 /* the MSS. */ 6375 /* ------------------------------------------------------------------------ */ 6376 static void 6377 ipf_nat_mssclamp(tcphdr_t *tcp, u_32_t maxmss, fr_info_t *fin, u_short *csump) 6378 { 6379 u_char *cp, *ep, opt; 6380 int hlen, advance; 6381 u_32_t mss, sumd; 6382 6383 hlen = TCP_OFF(tcp) << 2; 6384 if (hlen > sizeof(*tcp)) { 6385 cp = (u_char *)tcp + sizeof(*tcp); 6386 ep = (u_char *)tcp + hlen; 6387 6388 while (cp < ep) { 6389 opt = cp[0]; 6390 if (opt == TCPOPT_EOL) 6391 break; 6392 else if (opt == TCPOPT_NOP) { 6393 cp++; 6394 continue; 6395 } 6396 6397 if (cp + 1 >= ep) 6398 break; 6399 advance = cp[1]; 6400 if ((cp + advance > ep) || (advance <= 0)) 6401 break; 6402 switch (opt) 6403 { 6404 case TCPOPT_MAXSEG: 6405 if (advance != 4) 6406 break; 6407 mss = cp[2] * 256 + cp[3]; 6408 if (mss > maxmss) { 6409 cp[2] = maxmss / 256; 6410 cp[3] = maxmss & 0xff; 6411 CALC_SUMD(mss, maxmss, sumd); 6412 ipf_fix_outcksum(0, csump, sumd, 0); 6413 } 6414 break; 6415 default: 6416 /* ignore unknown options */ 6417 break; 6418 } 6419 6420 cp += advance; 6421 } 6422 } 6423 } 6424 6425 6426 /* ------------------------------------------------------------------------ */ 6427 /* Function: ipf_nat_setqueue */ 6428 /* Returns: Nil */ 6429 /* Parameters: softc(I) - pointer to soft context main structure */ 6430 /* softn(I) - pointer to NAT context structure */ 6431 /* nat(I)- pointer to NAT structure */ 6432 /* Locks: ipf_nat (read or write) */ 6433 /* */ 6434 /* Put the NAT entry on its default queue entry, using rev as a helped in */ 6435 /* determining which queue it should be placed on. */ 6436 /* ------------------------------------------------------------------------ */ 6437 void 6438 ipf_nat_setqueue(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 6439 { 6440 ipftq_t *oifq, *nifq; 6441 int rev = nat->nat_rev; 6442 6443 if (nat->nat_ptr != NULL) 6444 nifq = nat->nat_ptr->in_tqehead[rev]; 6445 else 6446 nifq = NULL; 6447 6448 if (nifq == NULL) { 6449 switch (nat->nat_pr[0]) 6450 { 6451 case IPPROTO_UDP : 6452 nifq = &softn->ipf_nat_udptq; 6453 break; 6454 case IPPROTO_ICMP : 6455 nifq = &softn->ipf_nat_icmptq; 6456 break; 6457 case IPPROTO_TCP : 6458 nifq = softn->ipf_nat_tcptq + 6459 nat->nat_tqe.tqe_state[rev]; 6460 break; 6461 default : 6462 nifq = &softn->ipf_nat_iptq; 6463 break; 6464 } 6465 } 6466 6467 oifq = nat->nat_tqe.tqe_ifq; 6468 /* 6469 * If it's currently on a timeout queue, move it from one queue to 6470 * another, else put it on the end of the newly determined queue. 6471 */ 6472 if (oifq != NULL) 6473 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq); 6474 else 6475 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat); 6476 return; 6477 } 6478 6479 6480 /* ------------------------------------------------------------------------ */ 6481 /* Function: nat_getnext */ 6482 /* Returns: int - 0 == ok, else error */ 6483 /* Parameters: softc(I) - pointer to soft context main structure */ 6484 /* t(I) - pointer to ipftoken structure */ 6485 /* itp(I) - pointer to ipfgeniter_t structure */ 6486 /* */ 6487 /* Fetch the next nat/ipnat structure pointer from the linked list and */ 6488 /* copy it out to the storage space pointed to by itp_data. The next item */ 6489 /* in the list to look at is put back in the ipftoken struture. */ 6490 /* ------------------------------------------------------------------------ */ 6491 static int 6492 ipf_nat_getnext(ipf_main_softc_t *softc, ipftoken_t *t, ipfgeniter_t *itp, 6493 ipfobj_t *objp) 6494 { 6495 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6496 hostmap_t *hm, *nexthm = NULL, zerohm; 6497 ipnat_t *ipn, *nextipnat = NULL, zeroipn; 6498 nat_t *nat, *nextnat = NULL, zeronat; 6499 int error = 0; 6500 void *nnext; 6501 6502 if (itp->igi_nitems != 1) { 6503 IPFERROR(60075); 6504 return ENOSPC; 6505 } 6506 6507 READ_ENTER(&softc->ipf_nat); 6508 6509 switch (itp->igi_type) 6510 { 6511 case IPFGENITER_HOSTMAP : 6512 hm = t->ipt_data; 6513 if (hm == NULL) { 6514 nexthm = softn->ipf_hm_maplist; 6515 } else { 6516 nexthm = hm->hm_next; 6517 } 6518 if (nexthm != NULL) { 6519 ATOMIC_INC32(nexthm->hm_ref); 6520 t->ipt_data = nexthm; 6521 } else { 6522 bzero(&zerohm, sizeof(zerohm)); 6523 nexthm = &zerohm; 6524 t->ipt_data = NULL; 6525 } 6526 nnext = nexthm->hm_next; 6527 break; 6528 6529 case IPFGENITER_IPNAT : 6530 ipn = t->ipt_data; 6531 if (ipn == NULL) { 6532 nextipnat = softn->ipf_nat_list; 6533 } else { 6534 nextipnat = ipn->in_next; 6535 } 6536 if (nextipnat != NULL) { 6537 ATOMIC_INC32(nextipnat->in_use); 6538 t->ipt_data = nextipnat; 6539 } else { 6540 bzero(&zeroipn, sizeof(zeroipn)); 6541 nextipnat = &zeroipn; 6542 t->ipt_data = NULL; 6543 } 6544 nnext = nextipnat->in_next; 6545 break; 6546 6547 case IPFGENITER_NAT : 6548 nat = t->ipt_data; 6549 if (nat == NULL) { 6550 nextnat = softn->ipf_nat_instances; 6551 } else { 6552 nextnat = nat->nat_next; 6553 } 6554 if (nextnat != NULL) { 6555 MUTEX_ENTER(&nextnat->nat_lock); 6556 nextnat->nat_ref++; 6557 MUTEX_EXIT(&nextnat->nat_lock); 6558 t->ipt_data = nextnat; 6559 } else { 6560 bzero(&zeronat, sizeof(zeronat)); 6561 nextnat = &zeronat; 6562 t->ipt_data = NULL; 6563 } 6564 nnext = nextnat->nat_next; 6565 break; 6566 6567 default : 6568 RWLOCK_EXIT(&softc->ipf_nat); 6569 IPFERROR(60055); 6570 return EINVAL; 6571 } 6572 6573 RWLOCK_EXIT(&softc->ipf_nat); 6574 6575 objp->ipfo_ptr = itp->igi_data; 6576 6577 switch (itp->igi_type) 6578 { 6579 case IPFGENITER_HOSTMAP : 6580 error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm)); 6581 if (error != 0) { 6582 IPFERROR(60049); 6583 error = EFAULT; 6584 } 6585 if (hm != NULL) { 6586 WRITE_ENTER(&softc->ipf_nat); 6587 ipf_nat_hostmapdel(softc, &hm); 6588 RWLOCK_EXIT(&softc->ipf_nat); 6589 } 6590 break; 6591 6592 case IPFGENITER_IPNAT : 6593 objp->ipfo_size = nextipnat->in_size; 6594 objp->ipfo_type = IPFOBJ_IPNAT; 6595 error = ipf_outobjk(softc, objp, nextipnat); 6596 if (ipn != NULL) { 6597 WRITE_ENTER(&softc->ipf_nat); 6598 ipf_nat_rule_deref(softc, &ipn); 6599 RWLOCK_EXIT(&softc->ipf_nat); 6600 } 6601 break; 6602 6603 case IPFGENITER_NAT : 6604 objp->ipfo_size = sizeof(nat_t); 6605 objp->ipfo_type = IPFOBJ_NAT; 6606 error = ipf_outobjk(softc, objp, nextnat); 6607 if (nat != NULL) 6608 ipf_nat_deref(softc, &nat); 6609 6610 break; 6611 } 6612 6613 if (nnext == NULL) 6614 ipf_token_mark_complete(t); 6615 6616 return error; 6617 } 6618 6619 6620 /* ------------------------------------------------------------------------ */ 6621 /* Function: nat_extraflush */ 6622 /* Returns: int - 0 == success, -1 == failure */ 6623 /* Parameters: softc(I) - pointer to soft context main structure */ 6624 /* softn(I) - pointer to NAT context structure */ 6625 /* which(I) - how to flush the active NAT table */ 6626 /* Write Locks: ipf_nat */ 6627 /* */ 6628 /* Flush nat tables. Three actions currently defined: */ 6629 /* which == 0 : flush all nat table entries */ 6630 /* which == 1 : flush TCP connections which have started to close but are */ 6631 /* stuck for some reason. */ 6632 /* which == 2 : flush TCP connections which have been idle for a long time, */ 6633 /* starting at > 4 days idle and working back in successive half-*/ 6634 /* days to at most 12 hours old. If this fails to free enough */ 6635 /* slots then work backwards in half hour slots to 30 minutes. */ 6636 /* If that too fails, then work backwards in 30 second intervals */ 6637 /* for the last 30 minutes to at worst 30 seconds idle. */ 6638 /* ------------------------------------------------------------------------ */ 6639 static int 6640 ipf_nat_extraflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, int which) 6641 { 6642 nat_t *nat, **natp; 6643 ipftqent_t *tqn; 6644 ipftq_t *ifq; 6645 int removed; 6646 SPL_INT(s); 6647 6648 removed = 0; 6649 6650 SPL_NET(s); 6651 switch (which) 6652 { 6653 case 0 : 6654 softn->ipf_nat_stats.ns_flush_all++; 6655 /* 6656 * Style 0 flush removes everything... 6657 */ 6658 for (natp = &softn->ipf_nat_instances; 6659 ((nat = *natp) != NULL); ) { 6660 ipf_nat_delete(softc, nat, NL_FLUSH); 6661 removed++; 6662 } 6663 break; 6664 6665 case 1 : 6666 softn->ipf_nat_stats.ns_flush_closing++; 6667 /* 6668 * Since we're only interested in things that are closing, 6669 * we can start with the appropriate timeout queue. 6670 */ 6671 for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT; 6672 ifq != NULL; ifq = ifq->ifq_next) { 6673 6674 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6675 nat = tqn->tqe_parent; 6676 tqn = tqn->tqe_next; 6677 if (nat->nat_pr[0] != IPPROTO_TCP || 6678 nat->nat_pr[1] != IPPROTO_TCP) 6679 break; 6680 ipf_nat_delete(softc, nat, NL_EXPIRE); 6681 removed++; 6682 } 6683 } 6684 6685 /* 6686 * Also need to look through the user defined queues. 6687 */ 6688 for (ifq = softn->ipf_nat_utqe; ifq != NULL; 6689 ifq = ifq->ifq_next) { 6690 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6691 nat = tqn->tqe_parent; 6692 tqn = tqn->tqe_next; 6693 if (nat->nat_pr[0] != IPPROTO_TCP || 6694 nat->nat_pr[1] != IPPROTO_TCP) 6695 continue; 6696 6697 if ((nat->nat_tcpstate[0] > 6698 IPF_TCPS_ESTABLISHED) && 6699 (nat->nat_tcpstate[1] > 6700 IPF_TCPS_ESTABLISHED)) { 6701 ipf_nat_delete(softc, nat, NL_EXPIRE); 6702 removed++; 6703 } 6704 } 6705 } 6706 break; 6707 6708 /* 6709 * Args 5-11 correspond to flushing those particular states 6710 * for TCP connections. 6711 */ 6712 case IPF_TCPS_CLOSE_WAIT : 6713 case IPF_TCPS_FIN_WAIT_1 : 6714 case IPF_TCPS_CLOSING : 6715 case IPF_TCPS_LAST_ACK : 6716 case IPF_TCPS_FIN_WAIT_2 : 6717 case IPF_TCPS_TIME_WAIT : 6718 case IPF_TCPS_CLOSED : 6719 softn->ipf_nat_stats.ns_flush_state++; 6720 tqn = softn->ipf_nat_tcptq[which].ifq_head; 6721 while (tqn != NULL) { 6722 nat = tqn->tqe_parent; 6723 tqn = tqn->tqe_next; 6724 ipf_nat_delete(softc, nat, NL_FLUSH); 6725 removed++; 6726 } 6727 break; 6728 6729 default : 6730 if (which < 30) 6731 break; 6732 6733 softn->ipf_nat_stats.ns_flush_timeout++; 6734 /* 6735 * Take a large arbitrary number to mean the number of seconds 6736 * for which which consider to be the maximum value we'll allow 6737 * the expiration to be. 6738 */ 6739 which = IPF_TTLVAL(which); 6740 for (natp = &softn->ipf_nat_instances; 6741 ((nat = *natp) != NULL); ) { 6742 if (softc->ipf_ticks - nat->nat_touched > which) { 6743 ipf_nat_delete(softc, nat, NL_FLUSH); 6744 removed++; 6745 } else 6746 natp = &nat->nat_next; 6747 } 6748 break; 6749 } 6750 6751 if (which != 2) { 6752 SPL_X(s); 6753 return removed; 6754 } 6755 6756 softn->ipf_nat_stats.ns_flush_queue++; 6757 6758 /* 6759 * Asked to remove inactive entries because the table is full, try 6760 * again, 3 times, if first attempt failed with a different criteria 6761 * each time. The order tried in must be in decreasing age. 6762 * Another alternative is to implement random drop and drop N entries 6763 * at random until N have been freed up. 6764 */ 6765 if (softc->ipf_ticks - softn->ipf_nat_last_force_flush > 6766 IPF_TTLVAL(5)) { 6767 softn->ipf_nat_last_force_flush = softc->ipf_ticks; 6768 6769 removed = ipf_queueflush(softc, ipf_nat_flush_entry, 6770 softn->ipf_nat_tcptq, 6771 softn->ipf_nat_utqe, 6772 &softn->ipf_nat_stats.ns_active, 6773 softn->ipf_nat_table_sz, 6774 softn->ipf_nat_table_wm_low); 6775 } 6776 6777 SPL_X(s); 6778 return removed; 6779 } 6780 6781 6782 /* ------------------------------------------------------------------------ */ 6783 /* Function: ipf_nat_flush_entry */ 6784 /* Returns: 0 - always succeeds */ 6785 /* Parameters: softc(I) - pointer to soft context main structure */ 6786 /* entry(I) - pointer to NAT entry */ 6787 /* Write Locks: ipf_nat */ 6788 /* */ 6789 /* This function is a stepping stone between ipf_queueflush() and */ 6790 /* nat_dlete(). It is used so we can provide a uniform interface via the */ 6791 /* ipf_queueflush() function. Since the nat_delete() function returns void */ 6792 /* we translate that to mean it always succeeds in deleting something. */ 6793 /* ------------------------------------------------------------------------ */ 6794 static int 6795 ipf_nat_flush_entry(ipf_main_softc_t *softc, void *entry) 6796 { 6797 ipf_nat_delete(softc, entry, NL_FLUSH); 6798 return 0; 6799 } 6800 6801 6802 /* ------------------------------------------------------------------------ */ 6803 /* Function: ipf_nat_iterator */ 6804 /* Returns: int - 0 == ok, else error */ 6805 /* Parameters: softc(I) - pointer to soft context main structure */ 6806 /* token(I) - pointer to ipftoken structure */ 6807 /* itp(I) - pointer to ipfgeniter_t structure */ 6808 /* obj(I) - pointer to data description structure */ 6809 /* */ 6810 /* This function acts as a handler for the SIOCGENITER ioctls that use a */ 6811 /* generic structure to iterate through a list. There are three different */ 6812 /* linked lists of NAT related information to go through: NAT rules, active */ 6813 /* NAT mappings and the NAT fragment cache. */ 6814 /* ------------------------------------------------------------------------ */ 6815 static int 6816 ipf_nat_iterator(ipf_main_softc_t *softc, ipftoken_t *token, ipfgeniter_t *itp, 6817 ipfobj_t *obj) 6818 { 6819 int error; 6820 6821 if (itp->igi_data == NULL) { 6822 IPFERROR(60052); 6823 return EFAULT; 6824 } 6825 6826 switch (itp->igi_type) 6827 { 6828 case IPFGENITER_HOSTMAP : 6829 case IPFGENITER_IPNAT : 6830 case IPFGENITER_NAT : 6831 error = ipf_nat_getnext(softc, token, itp, obj); 6832 break; 6833 6834 case IPFGENITER_NATFRAG : 6835 error = ipf_frag_nat_next(softc, token, itp); 6836 break; 6837 default : 6838 IPFERROR(60053); 6839 error = EINVAL; 6840 break; 6841 } 6842 6843 return error; 6844 } 6845 6846 6847 /* ------------------------------------------------------------------------ */ 6848 /* Function: ipf_nat_setpending */ 6849 /* Returns: Nil */ 6850 /* Parameters: softc(I) - pointer to soft context main structure */ 6851 /* nat(I) - pointer to NAT structure */ 6852 /* Locks: ipf_nat (read or write) */ 6853 /* */ 6854 /* Put the NAT entry on to the pending queue - this queue has a very short */ 6855 /* lifetime where items are put that can't be deleted straight away because */ 6856 /* of locking issues but we want to delete them ASAP, anyway. In calling */ 6857 /* this function, it is assumed that the owner (if there is one, as shown */ 6858 /* by nat_me) is no longer interested in it. */ 6859 /* ------------------------------------------------------------------------ */ 6860 void 6861 ipf_nat_setpending(ipf_main_softc_t *softc, nat_t *nat) 6862 { 6863 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6864 ipftq_t *oifq; 6865 6866 oifq = nat->nat_tqe.tqe_ifq; 6867 if (oifq != NULL) 6868 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, 6869 &softn->ipf_nat_pending); 6870 else 6871 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, 6872 &softn->ipf_nat_pending, nat); 6873 6874 if (nat->nat_me != NULL) { 6875 *nat->nat_me = NULL; 6876 nat->nat_me = NULL; 6877 nat->nat_ref--; 6878 ASSERT(nat->nat_ref >= 0); 6879 } 6880 } 6881 6882 6883 /* ------------------------------------------------------------------------ */ 6884 /* Function: nat_newrewrite */ 6885 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 6886 /* allow rule to be moved if IPN_ROUNDR is set. */ 6887 /* Parameters: fin(I) - pointer to packet information */ 6888 /* nat(I) - pointer to NAT entry */ 6889 /* ni(I) - pointer to structure with misc. information needed */ 6890 /* to create new NAT entry. */ 6891 /* Write Lock: ipf_nat */ 6892 /* */ 6893 /* This function is responsible for setting up an active NAT session where */ 6894 /* we are changing both the source and destination parameters at the same */ 6895 /* time. The loop in here works differently to elsewhere - each iteration */ 6896 /* is responsible for changing a single parameter that can be incremented. */ 6897 /* So one pass may increase the source IP#, next source port, next dest. IP#*/ 6898 /* and the last destination port for a total of 4 iterations to try each. */ 6899 /* This is done to try and exhaustively use the translation space available.*/ 6900 /* ------------------------------------------------------------------------ */ 6901 static int 6902 ipf_nat_newrewrite(fr_info_t *fin, nat_t *nat, natinfo_t *nai) 6903 { 6904 int src_search = 1; 6905 int dst_search = 1; 6906 fr_info_t frnat; 6907 u_32_t flags; 6908 u_short swap; 6909 ipnat_t *np; 6910 nat_t *natl; 6911 int l = 0; 6912 int changed; 6913 6914 natl = NULL; 6915 changed = -1; 6916 np = nai->nai_np; 6917 flags = nat->nat_flags; 6918 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 6919 6920 nat->nat_hm = NULL; 6921 6922 do { 6923 changed = -1; 6924 /* TRACE (l, src_search, dst_search, np) */ 6925 6926 if ((src_search == 0) && (np->in_spnext == 0) && 6927 (dst_search == 0) && (np->in_dpnext == 0)) { 6928 if (l > 0) 6929 return -1; 6930 } 6931 6932 /* 6933 * Find a new source address 6934 */ 6935 if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr, 6936 &frnat.fin_saddr) == -1) { 6937 return -1; 6938 } 6939 6940 if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) { 6941 src_search = 0; 6942 if (np->in_stepnext == 0) 6943 np->in_stepnext = 1; 6944 6945 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 6946 src_search = 0; 6947 if (np->in_stepnext == 0) 6948 np->in_stepnext = 1; 6949 6950 } else if (np->in_nsrcmsk == 0xffffffff) { 6951 src_search = 0; 6952 if (np->in_stepnext == 0) 6953 np->in_stepnext = 1; 6954 6955 } else if (np->in_nsrcmsk != 0xffffffff) { 6956 if (np->in_stepnext == 0 && changed == -1) { 6957 np->in_snip++; 6958 np->in_stepnext++; 6959 changed = 0; 6960 } 6961 } 6962 6963 if ((flags & IPN_TCPUDPICMP) != 0) { 6964 if (np->in_spnext != 0) 6965 frnat.fin_data[0] = np->in_spnext; 6966 6967 /* 6968 * Standard port translation. Select next port. 6969 */ 6970 if ((flags & IPN_FIXEDSPORT) != 0) { 6971 np->in_stepnext = 2; 6972 } else if ((np->in_stepnext == 1) && 6973 (changed == -1) && (natl != NULL)) { 6974 np->in_spnext++; 6975 np->in_stepnext++; 6976 changed = 1; 6977 if (np->in_spnext > np->in_spmax) 6978 np->in_spnext = np->in_spmin; 6979 } 6980 } else { 6981 np->in_stepnext = 2; 6982 } 6983 np->in_stepnext &= 0x3; 6984 6985 /* 6986 * Find a new destination address 6987 */ 6988 /* TRACE (fin, np, l, frnat) */ 6989 6990 if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr, 6991 &frnat.fin_daddr) == -1) 6992 return -1; 6993 if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 6994 dst_search = 0; 6995 if (np->in_stepnext == 2) 6996 np->in_stepnext = 3; 6997 6998 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) { 6999 dst_search = 0; 7000 if (np->in_stepnext == 2) 7001 np->in_stepnext = 3; 7002 7003 } else if (np->in_ndstmsk == 0xffffffff) { 7004 dst_search = 0; 7005 if (np->in_stepnext == 2) 7006 np->in_stepnext = 3; 7007 7008 } else if (np->in_ndstmsk != 0xffffffff) { 7009 if ((np->in_stepnext == 2) && (changed == -1) && 7010 (natl != NULL)) { 7011 changed = 2; 7012 np->in_stepnext++; 7013 np->in_dnip++; 7014 } 7015 } 7016 7017 if ((flags & IPN_TCPUDPICMP) != 0) { 7018 if (np->in_dpnext != 0) 7019 frnat.fin_data[1] = np->in_dpnext; 7020 7021 /* 7022 * Standard port translation. Select next port. 7023 */ 7024 if ((flags & IPN_FIXEDDPORT) != 0) { 7025 np->in_stepnext = 0; 7026 } else if (np->in_stepnext == 3 && changed == -1) { 7027 np->in_dpnext++; 7028 np->in_stepnext++; 7029 changed = 3; 7030 if (np->in_dpnext > np->in_dpmax) 7031 np->in_dpnext = np->in_dpmin; 7032 } 7033 } else { 7034 if (np->in_stepnext == 3) 7035 np->in_stepnext = 0; 7036 } 7037 7038 /* TRACE (frnat) */ 7039 7040 /* 7041 * Here we do a lookup of the connection as seen from 7042 * the outside. If an IP# pair already exists, try 7043 * again. So if you have A->B becomes C->B, you can 7044 * also have D->E become C->E but not D->B causing 7045 * another C->B. Also take protocol and ports into 7046 * account when determining whether a pre-existing 7047 * NAT setup will cause an external conflict where 7048 * this is appropriate. 7049 * 7050 * fin_data[] is swapped around because we are doing a 7051 * lookup of the packet is if it were moving in the opposite 7052 * direction of the one we are working with now. 7053 */ 7054 if (flags & IPN_TCPUDP) { 7055 swap = frnat.fin_data[0]; 7056 frnat.fin_data[0] = frnat.fin_data[1]; 7057 frnat.fin_data[1] = swap; 7058 } 7059 if (fin->fin_out == 1) { 7060 natl = ipf_nat_inlookup(&frnat, 7061 flags & ~(SI_WILDP|NAT_SEARCH), 7062 (u_int)frnat.fin_p, 7063 frnat.fin_dst, frnat.fin_src); 7064 7065 } else { 7066 natl = ipf_nat_outlookup(&frnat, 7067 flags & ~(SI_WILDP|NAT_SEARCH), 7068 (u_int)frnat.fin_p, 7069 frnat.fin_dst, frnat.fin_src); 7070 } 7071 if (flags & IPN_TCPUDP) { 7072 swap = frnat.fin_data[0]; 7073 frnat.fin_data[0] = frnat.fin_data[1]; 7074 frnat.fin_data[1] = swap; 7075 } 7076 7077 /* TRACE natl, in_stepnext, l */ 7078 7079 if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */ 7080 return -1; 7081 7082 np->in_stepnext &= 0x3; 7083 7084 l++; 7085 changed = -1; 7086 } while (natl != NULL); 7087 7088 nat->nat_osrcip = fin->fin_src; 7089 nat->nat_odstip = fin->fin_dst; 7090 nat->nat_nsrcip = frnat.fin_src; 7091 nat->nat_ndstip = frnat.fin_dst; 7092 7093 if ((flags & IPN_TCPUDP) != 0) { 7094 nat->nat_osport = htons(fin->fin_data[0]); 7095 nat->nat_odport = htons(fin->fin_data[1]); 7096 nat->nat_nsport = htons(frnat.fin_data[0]); 7097 nat->nat_ndport = htons(frnat.fin_data[1]); 7098 } else if ((flags & IPN_ICMPQUERY) != 0) { 7099 nat->nat_oicmpid = fin->fin_data[1]; 7100 nat->nat_nicmpid = frnat.fin_data[1]; 7101 } 7102 7103 return 0; 7104 } 7105 7106 7107 /* ------------------------------------------------------------------------ */ 7108 /* Function: nat_newdivert */ 7109 /* Returns: int - -1 == error, 0 == success */ 7110 /* Parameters: fin(I) - pointer to packet information */ 7111 /* nat(I) - pointer to NAT entry */ 7112 /* ni(I) - pointer to structure with misc. information needed */ 7113 /* to create new NAT entry. */ 7114 /* Write Lock: ipf_nat */ 7115 /* */ 7116 /* Create a new NAT divert session as defined by the NAT rule. This is */ 7117 /* somewhat different to other NAT session creation routines because we */ 7118 /* do not iterate through either port numbers or IP addresses, searching */ 7119 /* for a unique mapping, however, a complimentary duplicate check is made. */ 7120 /* ------------------------------------------------------------------------ */ 7121 static int 7122 ipf_nat_newdivert(fr_info_t *fin, nat_t *nat, natinfo_t *nai) 7123 { 7124 ipf_main_softc_t *softc = fin->fin_main_soft; 7125 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7126 fr_info_t frnat; 7127 ipnat_t *np; 7128 nat_t *natl; 7129 int p; 7130 7131 np = nai->nai_np; 7132 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 7133 7134 nat->nat_pr[0] = 0; 7135 nat->nat_osrcaddr = fin->fin_saddr; 7136 nat->nat_odstaddr = fin->fin_daddr; 7137 frnat.fin_saddr = htonl(np->in_snip); 7138 frnat.fin_daddr = htonl(np->in_dnip); 7139 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7140 nat->nat_osport = htons(fin->fin_data[0]); 7141 nat->nat_odport = htons(fin->fin_data[1]); 7142 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7143 nat->nat_oicmpid = fin->fin_data[1]; 7144 } 7145 7146 if (np->in_redir & NAT_DIVERTUDP) { 7147 frnat.fin_data[0] = np->in_spnext; 7148 frnat.fin_data[1] = np->in_dpnext; 7149 frnat.fin_flx |= FI_TCPUDP; 7150 p = IPPROTO_UDP; 7151 } else { 7152 frnat.fin_flx &= ~FI_TCPUDP; 7153 p = IPPROTO_IPIP; 7154 } 7155 7156 if (fin->fin_out == 1) { 7157 natl = ipf_nat_inlookup(&frnat, 0, p, 7158 frnat.fin_dst, frnat.fin_src); 7159 7160 } else { 7161 natl = ipf_nat_outlookup(&frnat, 0, p, 7162 frnat.fin_dst, frnat.fin_src); 7163 } 7164 7165 if (natl != NULL) { 7166 NBUMPSIDED(fin->fin_out, ns_divert_exist); 7167 return -1; 7168 } 7169 7170 nat->nat_nsrcaddr = frnat.fin_saddr; 7171 nat->nat_ndstaddr = frnat.fin_daddr; 7172 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7173 nat->nat_nsport = htons(frnat.fin_data[0]); 7174 nat->nat_ndport = htons(frnat.fin_data[1]); 7175 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7176 nat->nat_nicmpid = frnat.fin_data[1]; 7177 } 7178 7179 nat->nat_pr[fin->fin_out] = fin->fin_p; 7180 nat->nat_pr[1 - fin->fin_out] = p; 7181 7182 if (np->in_redir & NAT_REDIRECT) 7183 nat->nat_dir = NAT_DIVERTIN; 7184 else 7185 nat->nat_dir = NAT_DIVERTOUT; 7186 7187 return 0; 7188 } 7189 7190 7191 /* ------------------------------------------------------------------------ */ 7192 /* Function: nat_builddivertmp */ 7193 /* Returns: int - -1 == error, 0 == success */ 7194 /* Parameters: softn(I) - pointer to NAT context structure */ 7195 /* np(I) - pointer to a NAT rule */ 7196 /* */ 7197 /* For divert rules, a skeleton packet representing what will be prepended */ 7198 /* to the real packet is created. Even though we don't have the full */ 7199 /* packet here, a checksum is calculated that we update later when we */ 7200 /* fill in the final details. At present a 0 checksum for UDP is being set */ 7201 /* here because it is expected that divert will be used for localhost. */ 7202 /* ------------------------------------------------------------------------ */ 7203 static int 7204 ipf_nat_builddivertmp(ipf_nat_softc_t *softn, ipnat_t *np) 7205 { 7206 udphdr_t *uh; 7207 size_t len; 7208 ip_t *ip; 7209 7210 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7211 len = sizeof(ip_t) + sizeof(udphdr_t); 7212 else 7213 len = sizeof(ip_t); 7214 7215 ALLOC_MB_T(np->in_divmp, len); 7216 if (np->in_divmp == NULL) { 7217 NBUMPD(ipf_nat_stats, ns_divert_build); 7218 return -1; 7219 } 7220 7221 /* 7222 * First, the header to get the packet diverted to the new destination 7223 */ 7224 ip = MTOD(np->in_divmp, ip_t *); 7225 IP_V_A(ip, 4); 7226 IP_HL_A(ip, 5); 7227 ip->ip_tos = 0; 7228 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7229 ip->ip_p = IPPROTO_UDP; 7230 else 7231 ip->ip_p = IPPROTO_IPIP; 7232 ip->ip_ttl = 255; 7233 ip->ip_off = 0; 7234 ip->ip_sum = 0; 7235 ip->ip_len = htons(len); 7236 ip->ip_id = 0; 7237 ip->ip_src.s_addr = htonl(np->in_snip); 7238 ip->ip_dst.s_addr = htonl(np->in_dnip); 7239 ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip)); 7240 7241 if (np->in_redir & NAT_DIVERTUDP) { 7242 uh = (udphdr_t *)(ip + 1); 7243 uh->uh_sum = 0; 7244 uh->uh_ulen = 8; 7245 uh->uh_sport = htons(np->in_spnext); 7246 uh->uh_dport = htons(np->in_dpnext); 7247 } 7248 7249 return 0; 7250 } 7251 7252 7253 #define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t)) 7254 7255 /* ------------------------------------------------------------------------ */ 7256 /* Function: nat_decap */ 7257 /* Returns: int - -1 == error, 0 == success */ 7258 /* Parameters: fin(I) - pointer to packet information */ 7259 /* nat(I) - pointer to current NAT session */ 7260 /* */ 7261 /* This function is responsible for undoing a packet's encapsulation in the */ 7262 /* reverse of an encap/divert rule. After removing the outer encapsulation */ 7263 /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/ 7264 /* match the "new" packet as it may still be used by IPFilter elsewhere. */ 7265 /* We use "dir" here as the basis for some of the expectations about the */ 7266 /* outer header. If we return an error, the goal is to leave the original */ 7267 /* packet information undisturbed - this falls short at the end where we'd */ 7268 /* need to back a backup copy of "fin" - expensive. */ 7269 /* ------------------------------------------------------------------------ */ 7270 static int 7271 ipf_nat_decap(fr_info_t *fin, nat_t *nat) 7272 { 7273 ipf_main_softc_t *softc = fin->fin_main_soft; 7274 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7275 char *hdr; 7276 int hlen; 7277 int skip; 7278 mb_t *m; 7279 7280 if ((fin->fin_flx & FI_ICMPERR) != 0) { 7281 /* 7282 * ICMP packets don't get decapsulated, instead what we need 7283 * to do is change the ICMP reply from including (in the data 7284 * portion for errors) the encapsulated packet that we sent 7285 * out to something that resembles the original packet prior 7286 * to encapsulation. This isn't done here - all we're doing 7287 * here is changing the outer address to ensure that it gets 7288 * targetted back to the correct system. 7289 */ 7290 7291 if (nat->nat_dir & NAT_OUTBOUND) { 7292 u_32_t sum1, sum2, sumd; 7293 7294 sum1 = ntohl(fin->fin_daddr); 7295 sum2 = ntohl(nat->nat_osrcaddr); 7296 CALC_SUMD(sum1, sum2, sumd); 7297 fin->fin_ip->ip_dst = nat->nat_osrcip; 7298 fin->fin_daddr = nat->nat_osrcaddr; 7299 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 7300 defined(__osf__) || defined(linux) 7301 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0); 7302 #endif 7303 } 7304 return 0; 7305 } 7306 7307 m = fin->fin_m; 7308 skip = fin->fin_hlen; 7309 7310 switch (nat->nat_dir) 7311 { 7312 case NAT_DIVERTIN : 7313 case NAT_DIVERTOUT : 7314 if (fin->fin_plen < MINDECAP) 7315 return -1; 7316 skip += sizeof(udphdr_t); 7317 break; 7318 7319 case NAT_ENCAPIN : 7320 case NAT_ENCAPOUT : 7321 if (fin->fin_plen < (skip + sizeof(ip_t))) 7322 return -1; 7323 break; 7324 default : 7325 return -1; 7326 /* NOTREACHED */ 7327 } 7328 7329 /* 7330 * The aim here is to keep the original packet details in "fin" for 7331 * as long as possible so that returning with an error is for the 7332 * original packet and there is little undoing work to do. 7333 */ 7334 if (M_LEN(m) < skip + sizeof(ip_t)) { 7335 if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1) 7336 return -1; 7337 } 7338 7339 hdr = MTOD(fin->fin_m, char *); 7340 fin->fin_ip = (ip_t *)(hdr + skip); 7341 hlen = IP_HL(fin->fin_ip) << 2; 7342 7343 if (ipf_pr_pullup(fin, skip + hlen) == -1) { 7344 NBUMPSIDED(fin->fin_out, ns_decap_pullup); 7345 return -1; 7346 } 7347 7348 fin->fin_hlen = hlen; 7349 fin->fin_dlen -= skip; 7350 fin->fin_plen -= skip; 7351 fin->fin_ipoff += skip; 7352 7353 if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) { 7354 NBUMPSIDED(fin->fin_out, ns_decap_bad); 7355 return -1; 7356 } 7357 7358 return skip; 7359 } 7360 7361 7362 /* ------------------------------------------------------------------------ */ 7363 /* Function: nat_nextaddr */ 7364 /* Returns: int - -1 == bad input (no new address), */ 7365 /* 0 == success and dst has new address */ 7366 /* Parameters: fin(I) - pointer to packet information */ 7367 /* na(I) - how to generate new address */ 7368 /* old(I) - original address being replaced */ 7369 /* dst(O) - where to put the new address */ 7370 /* Write Lock: ipf_nat */ 7371 /* */ 7372 /* This function uses the contents of the "na" structure, in combination */ 7373 /* with "old" to produce a new address to store in "dst". Not all of the */ 7374 /* possible uses of "na" will result in a new address. */ 7375 /* ------------------------------------------------------------------------ */ 7376 static int 7377 ipf_nat_nextaddr(fr_info_t *fin, nat_addr_t *na, u_32_t *old, u_32_t *dst) 7378 { 7379 ipf_main_softc_t *softc = fin->fin_main_soft; 7380 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7381 u_32_t amin, amax, new; 7382 i6addr_t newip; 7383 int error; 7384 7385 new = 0; 7386 amin = na->na_addr[0].in4.s_addr; 7387 7388 switch (na->na_atype) 7389 { 7390 case FRI_RANGE : 7391 amax = na->na_addr[1].in4.s_addr; 7392 break; 7393 7394 case FRI_NETMASKED : 7395 case FRI_DYNAMIC : 7396 case FRI_NORMAL : 7397 /* 7398 * Compute the maximum address by adding the inverse of the 7399 * netmask to the minimum address. 7400 */ 7401 amax = ~na->na_addr[1].in4.s_addr; 7402 amax |= amin; 7403 break; 7404 7405 case FRI_LOOKUP : 7406 break; 7407 7408 case FRI_BROADCAST : 7409 case FRI_PEERADDR : 7410 case FRI_NETWORK : 7411 default : 7412 return -1; 7413 } 7414 7415 error = -1; 7416 7417 if (na->na_atype == FRI_LOOKUP) { 7418 if (na->na_type == IPLT_DSTLIST) { 7419 error = ipf_dstlist_select_node(fin, na->na_ptr, dst, 7420 NULL); 7421 } else { 7422 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7423 } 7424 7425 } else if (na->na_atype == IPLT_NONE) { 7426 /* 7427 * 0/0 as the new address means leave it alone. 7428 */ 7429 if (na->na_addr[0].in4.s_addr == 0 && 7430 na->na_addr[1].in4.s_addr == 0) { 7431 new = *old; 7432 7433 /* 7434 * 0/32 means get the interface's address 7435 */ 7436 } else if (na->na_addr[0].in4.s_addr == 0 && 7437 na->na_addr[1].in4.s_addr == 0xffffffff) { 7438 if (ipf_ifpaddr(softc, 4, na->na_atype, 7439 fin->fin_ifp, &newip, NULL) == -1) { 7440 NBUMPSIDED(fin->fin_out, ns_ifpaddrfail); 7441 return -1; 7442 } 7443 new = newip.in4.s_addr; 7444 } else { 7445 new = htonl(na->na_nextip); 7446 } 7447 *dst = new; 7448 error = 0; 7449 7450 } else { 7451 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7452 } 7453 7454 return error; 7455 } 7456 7457 7458 /* ------------------------------------------------------------------------ */ 7459 /* Function: nat_nextaddrinit */ 7460 /* Returns: int - 0 == success, else error number */ 7461 /* Parameters: softc(I) - pointer to soft context main structure */ 7462 /* na(I) - NAT address information for generating new addr*/ 7463 /* initial(I) - flag indicating if it is the first call for */ 7464 /* this "na" structure. */ 7465 /* ifp(I) - network interface to derive address */ 7466 /* information from. */ 7467 /* */ 7468 /* This function is expected to be called in two scenarious: when a new NAT */ 7469 /* rule is loaded into the kernel and when the list of NAT rules is sync'd */ 7470 /* up with the valid network interfaces (possibly due to them changing.) */ 7471 /* To distinguish between these, the "initial" parameter is used. If it is */ 7472 /* 1 then this indicates the rule has just been reloaded and 0 for when we */ 7473 /* are updating information. This difference is important because in */ 7474 /* instances where we are not updating address information associated with */ 7475 /* a network interface, we don't want to disturb what the "next" address to */ 7476 /* come out of ipf_nat_nextaddr() will be. */ 7477 /* ------------------------------------------------------------------------ */ 7478 static int 7479 ipf_nat_nextaddrinit(ipf_main_softc_t *softc, char *base, nat_addr_t *na, 7480 int initial, void *ifp) 7481 { 7482 7483 switch (na->na_atype) 7484 { 7485 case FRI_LOOKUP : 7486 if (na->na_subtype == 0) { 7487 na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT, 7488 na->na_type, 7489 na->na_num, 7490 &na->na_func); 7491 } else if (na->na_subtype == 1) { 7492 na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT, 7493 na->na_type, 7494 base + na->na_num, 7495 &na->na_func); 7496 } 7497 if (na->na_func == NULL) { 7498 IPFERROR(60060); 7499 return ESRCH; 7500 } 7501 if (na->na_ptr == NULL) { 7502 IPFERROR(60056); 7503 return ESRCH; 7504 } 7505 break; 7506 7507 case FRI_DYNAMIC : 7508 case FRI_BROADCAST : 7509 case FRI_NETWORK : 7510 case FRI_NETMASKED : 7511 case FRI_PEERADDR : 7512 if (ifp != NULL) 7513 (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp, 7514 &na->na_addr[0], &na->na_addr[1]); 7515 break; 7516 7517 case FRI_SPLIT : 7518 case FRI_RANGE : 7519 if (initial) 7520 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7521 break; 7522 7523 case FRI_NONE : 7524 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7525 return 0; 7526 7527 case FRI_NORMAL : 7528 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7529 break; 7530 7531 default : 7532 IPFERROR(60054); 7533 return EINVAL; 7534 } 7535 7536 if (initial && (na->na_atype == FRI_NORMAL)) { 7537 if (na->na_addr[0].in4.s_addr == 0) { 7538 if ((na->na_addr[1].in4.s_addr == 0xffffffff) || 7539 (na->na_addr[1].in4.s_addr == 0)) { 7540 return 0; 7541 } 7542 } 7543 7544 if (na->na_addr[1].in4.s_addr == 0xffffffff) { 7545 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7546 } else { 7547 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1; 7548 } 7549 } 7550 7551 return 0; 7552 } 7553 7554 7555 /* ------------------------------------------------------------------------ */ 7556 /* Function: ipf_nat_matchflush */ 7557 /* Returns: int - -1 == error, 0 == success */ 7558 /* Parameters: softc(I) - pointer to soft context main structure */ 7559 /* softn(I) - pointer to NAT context structure */ 7560 /* nat(I) - pointer to current NAT session */ 7561 /* */ 7562 /* ------------------------------------------------------------------------ */ 7563 static int 7564 ipf_nat_matchflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, void *data) 7565 { 7566 int *array, flushed, error; 7567 nat_t *nat, *natnext; 7568 ipfobj_t obj; 7569 7570 error = ipf_matcharray_load(softc, data, &obj, &array); 7571 if (error != 0) 7572 return error; 7573 7574 flushed = 0; 7575 7576 for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) { 7577 natnext = nat->nat_next; 7578 if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) { 7579 ipf_nat_delete(softc, nat, NL_FLUSH); 7580 flushed++; 7581 } 7582 } 7583 7584 obj.ipfo_retval = flushed; 7585 error = BCOPYOUT(&obj, data, sizeof(obj)); 7586 7587 KFREES(array, array[0] * sizeof(*array)); 7588 7589 return error; 7590 } 7591 7592 7593 /* ------------------------------------------------------------------------ */ 7594 /* Function: ipf_nat_matcharray */ 7595 /* Returns: int - -1 == error, 0 == success */ 7596 /* Parameters: fin(I) - pointer to packet information */ 7597 /* nat(I) - pointer to current NAT session */ 7598 /* */ 7599 /* ------------------------------------------------------------------------ */ 7600 static int 7601 ipf_nat_matcharray(nat_t *nat, int *array, u_long ticks) 7602 { 7603 int i, n, *x, e, p; 7604 7605 e = 0; 7606 n = array[0]; 7607 x = array + 1; 7608 7609 for (; n > 0; x += 3 + x[2]) { 7610 if (x[0] == IPF_EXP_END) 7611 break; 7612 e = 0; 7613 7614 n -= x[2] + 3; 7615 if (n < 0) 7616 break; 7617 7618 p = x[0] >> 16; 7619 if (p != 0 && p != nat->nat_pr[1]) 7620 break; 7621 7622 switch (x[0]) 7623 { 7624 case IPF_EXP_IP_PR : 7625 for (i = 0; !e && i < x[2]; i++) { 7626 e |= (nat->nat_pr[1] == x[i + 3]); 7627 } 7628 break; 7629 7630 case IPF_EXP_IP_SRCADDR : 7631 if (nat->nat_v[0] == 4) { 7632 for (i = 0; !e && i < x[2]; i++) { 7633 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7634 x[i + 3]); 7635 } 7636 } 7637 if (nat->nat_v[1] == 4) { 7638 for (i = 0; !e && i < x[2]; i++) { 7639 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7640 x[i + 3]); 7641 } 7642 } 7643 break; 7644 7645 case IPF_EXP_IP_DSTADDR : 7646 if (nat->nat_v[0] == 4) { 7647 for (i = 0; !e && i < x[2]; i++) { 7648 e |= ((nat->nat_odstaddr & x[i + 4]) == 7649 x[i + 3]); 7650 } 7651 } 7652 if (nat->nat_v[1] == 4) { 7653 for (i = 0; !e && i < x[2]; i++) { 7654 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7655 x[i + 3]); 7656 } 7657 } 7658 break; 7659 7660 case IPF_EXP_IP_ADDR : 7661 for (i = 0; !e && i < x[2]; i++) { 7662 if (nat->nat_v[0] == 4) { 7663 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7664 x[i + 3]); 7665 } 7666 if (nat->nat_v[1] == 4) { 7667 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7668 x[i + 3]); 7669 } 7670 if (nat->nat_v[0] == 4) { 7671 e |= ((nat->nat_odstaddr & x[i + 4]) == 7672 x[i + 3]); 7673 } 7674 if (nat->nat_v[1] == 4) { 7675 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7676 x[i + 3]); 7677 } 7678 } 7679 break; 7680 7681 #ifdef USE_INET6 7682 case IPF_EXP_IP6_SRCADDR : 7683 if (nat->nat_v[0] == 6) { 7684 for (i = 0; !e && i < x[3]; i++) { 7685 e |= IP6_MASKEQ(&nat->nat_osrc6, 7686 x + i + 7, x + i + 3); 7687 } 7688 } 7689 if (nat->nat_v[1] == 6) { 7690 for (i = 0; !e && i < x[3]; i++) { 7691 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7692 x + i + 7, x + i + 3); 7693 } 7694 } 7695 break; 7696 7697 case IPF_EXP_IP6_DSTADDR : 7698 if (nat->nat_v[0] == 6) { 7699 for (i = 0; !e && i < x[3]; i++) { 7700 e |= IP6_MASKEQ(&nat->nat_odst6, 7701 x + i + 7, 7702 x + i + 3); 7703 } 7704 } 7705 if (nat->nat_v[1] == 6) { 7706 for (i = 0; !e && i < x[3]; i++) { 7707 e |= IP6_MASKEQ(&nat->nat_ndst6, 7708 x + i + 7, 7709 x + i + 3); 7710 } 7711 } 7712 break; 7713 7714 case IPF_EXP_IP6_ADDR : 7715 for (i = 0; !e && i < x[3]; i++) { 7716 if (nat->nat_v[0] == 6) { 7717 e |= IP6_MASKEQ(&nat->nat_osrc6, 7718 x + i + 7, 7719 x + i + 3); 7720 } 7721 if (nat->nat_v[0] == 6) { 7722 e |= IP6_MASKEQ(&nat->nat_odst6, 7723 x + i + 7, 7724 x + i + 3); 7725 } 7726 if (nat->nat_v[1] == 6) { 7727 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7728 x + i + 7, 7729 x + i + 3); 7730 } 7731 if (nat->nat_v[1] == 6) { 7732 e |= IP6_MASKEQ(&nat->nat_ndst6, 7733 x + i + 7, 7734 x + i + 3); 7735 } 7736 } 7737 break; 7738 #endif 7739 7740 case IPF_EXP_UDP_PORT : 7741 case IPF_EXP_TCP_PORT : 7742 for (i = 0; !e && i < x[2]; i++) { 7743 e |= (nat->nat_nsport == x[i + 3]) || 7744 (nat->nat_ndport == x[i + 3]); 7745 } 7746 break; 7747 7748 case IPF_EXP_UDP_SPORT : 7749 case IPF_EXP_TCP_SPORT : 7750 for (i = 0; !e && i < x[2]; i++) { 7751 e |= (nat->nat_nsport == x[i + 3]); 7752 } 7753 break; 7754 7755 case IPF_EXP_UDP_DPORT : 7756 case IPF_EXP_TCP_DPORT : 7757 for (i = 0; !e && i < x[2]; i++) { 7758 e |= (nat->nat_ndport == x[i + 3]); 7759 } 7760 break; 7761 7762 case IPF_EXP_TCP_STATE : 7763 for (i = 0; !e && i < x[2]; i++) { 7764 e |= (nat->nat_tcpstate[0] == x[i + 3]) || 7765 (nat->nat_tcpstate[1] == x[i + 3]); 7766 } 7767 break; 7768 7769 case IPF_EXP_IDLE_GT : 7770 e |= (ticks - nat->nat_touched > x[3]); 7771 break; 7772 } 7773 e ^= x[1]; 7774 7775 if (!e) 7776 break; 7777 } 7778 7779 return e; 7780 } 7781 7782 7783 /* ------------------------------------------------------------------------ */ 7784 /* Function: ipf_nat_gettable */ 7785 /* Returns: int - 0 = success, else error */ 7786 /* Parameters: softc(I) - pointer to soft context main structure */ 7787 /* softn(I) - pointer to NAT context structure */ 7788 /* data(I) - pointer to ioctl data */ 7789 /* */ 7790 /* This function handles ioctl requests for tables of nat information. */ 7791 /* At present the only table it deals with is the hash bucket statistics. */ 7792 /* ------------------------------------------------------------------------ */ 7793 static int 7794 ipf_nat_gettable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, char *data) 7795 { 7796 ipftable_t table; 7797 int error; 7798 7799 error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE); 7800 if (error != 0) 7801 return error; 7802 7803 switch (table.ita_type) 7804 { 7805 case IPFTABLE_BUCKETS_NATIN : 7806 error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 7807 table.ita_table, 7808 softn->ipf_nat_table_sz * sizeof(u_int)); 7809 break; 7810 7811 case IPFTABLE_BUCKETS_NATOUT : 7812 error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 7813 table.ita_table, 7814 softn->ipf_nat_table_sz * sizeof(u_int)); 7815 break; 7816 7817 default : 7818 IPFERROR(60058); 7819 return EINVAL; 7820 } 7821 7822 if (error != 0) { 7823 IPFERROR(60059); 7824 error = EFAULT; 7825 } 7826 return error; 7827 } 7828 7829 7830 /* ------------------------------------------------------------------------ */ 7831 /* Function: ipf_nat_settimeout */ 7832 /* Returns: int - 0 = success, else failure */ 7833 /* Parameters: softc(I) - pointer to soft context main structure */ 7834 /* t(I) - pointer to tunable */ 7835 /* p(I) - pointer to new tuning data */ 7836 /* */ 7837 /* Apply the timeout change to the NAT timeout queues. */ 7838 /* ------------------------------------------------------------------------ */ 7839 int 7840 ipf_nat_settimeout(struct ipf_main_softc_s *softc, ipftuneable_t *t, 7841 ipftuneval_t *p) 7842 { 7843 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7844 7845 if (!strncmp(t->ipft_name, "tcp_", 4)) 7846 return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq); 7847 7848 if (!strcmp(t->ipft_name, "udp_timeout")) { 7849 ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int); 7850 } else if (!strcmp(t->ipft_name, "udp_ack_timeout")) { 7851 ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int); 7852 } else if (!strcmp(t->ipft_name, "icmp_timeout")) { 7853 ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int); 7854 } else if (!strcmp(t->ipft_name, "icmp_ack_timeout")) { 7855 ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int); 7856 } else if (!strcmp(t->ipft_name, "ip_timeout")) { 7857 ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int); 7858 } else { 7859 IPFERROR(60062); 7860 return ESRCH; 7861 } 7862 return 0; 7863 } 7864 7865 7866 /* ------------------------------------------------------------------------ */ 7867 /* Function: ipf_nat_rehash */ 7868 /* Returns: int - 0 = success, else failure */ 7869 /* Parameters: softc(I) - pointer to soft context main structure */ 7870 /* t(I) - pointer to tunable */ 7871 /* p(I) - pointer to new tuning data */ 7872 /* */ 7873 /* To change the size of the basic NAT table, we need to first allocate the */ 7874 /* new tables (lest it fails and we've got nowhere to store all of the NAT */ 7875 /* sessions currently active) and then walk through the entire list and */ 7876 /* insert them into the table. There are two tables here: an inbound one */ 7877 /* and an outbound one. Each NAT entry goes into each table once. */ 7878 /* ------------------------------------------------------------------------ */ 7879 int 7880 ipf_nat_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) 7881 { 7882 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7883 nat_t **newtab[2], *nat, **natp; 7884 u_int *bucketlens[2]; 7885 u_int maxbucket; 7886 u_int newsize; 7887 int error; 7888 u_int hv; 7889 int i; 7890 7891 newsize = p->ipftu_int; 7892 /* 7893 * In case there is nothing to do... 7894 */ 7895 if (newsize == softn->ipf_nat_table_sz) 7896 return 0; 7897 7898 newtab[0] = NULL; 7899 newtab[1] = NULL; 7900 bucketlens[0] = NULL; 7901 bucketlens[1] = NULL; 7902 /* 7903 * 4 tables depend on the NAT table size: the inbound looking table, 7904 * the outbound lookup table and the hash chain length for each. 7905 */ 7906 KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *)); 7907 if (newtab[0] == NULL) { 7908 error = 60063; 7909 goto badrehash; 7910 } 7911 7912 KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *)); 7913 if (newtab[1] == NULL) { 7914 error = 60064; 7915 goto badrehash; 7916 } 7917 7918 KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int)); 7919 if (bucketlens[0] == NULL) { 7920 error = 60065; 7921 goto badrehash; 7922 } 7923 7924 KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int)); 7925 if (bucketlens[1] == NULL) { 7926 error = 60066; 7927 goto badrehash; 7928 } 7929 7930 /* 7931 * Recalculate the maximum length based on the new size. 7932 */ 7933 for (maxbucket = 0, i = newsize; i > 0; i >>= 1) 7934 maxbucket++; 7935 maxbucket *= 2; 7936 7937 bzero((char *)newtab[0], newsize * sizeof(nat_t *)); 7938 bzero((char *)newtab[1], newsize * sizeof(nat_t *)); 7939 bzero((char *)bucketlens[0], newsize * sizeof(u_int)); 7940 bzero((char *)bucketlens[1], newsize * sizeof(u_int)); 7941 7942 WRITE_ENTER(&softc->ipf_nat); 7943 7944 if (softn->ipf_nat_table[0] != NULL) { 7945 KFREES(softn->ipf_nat_table[0], 7946 softn->ipf_nat_table_sz * 7947 sizeof(*softn->ipf_nat_table[0])); 7948 } 7949 softn->ipf_nat_table[0] = newtab[0]; 7950 7951 if (softn->ipf_nat_table[1] != NULL) { 7952 KFREES(softn->ipf_nat_table[1], 7953 softn->ipf_nat_table_sz * 7954 sizeof(*softn->ipf_nat_table[1])); 7955 } 7956 softn->ipf_nat_table[1] = newtab[1]; 7957 7958 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 7959 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 7960 softn->ipf_nat_table_sz * sizeof(u_int)); 7961 } 7962 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0]; 7963 7964 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 7965 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 7966 softn->ipf_nat_table_sz * sizeof(u_int)); 7967 } 7968 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1]; 7969 7970 softn->ipf_nat_maxbucket = maxbucket; 7971 softn->ipf_nat_table_sz = newsize; 7972 /* 7973 * Walk through the entire list of NAT table entries and put them 7974 * in the new NAT table, somewhere. Because we have a new table, 7975 * we need to restart the counter of how many chains are in use. 7976 */ 7977 softn->ipf_nat_stats.ns_side[0].ns_inuse = 0; 7978 softn->ipf_nat_stats.ns_side[1].ns_inuse = 0; 7979 7980 for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) { 7981 nat->nat_hnext[0] = NULL; 7982 nat->nat_phnext[0] = NULL; 7983 hv = nat->nat_hv[0] % softn->ipf_nat_table_sz; 7984 7985 natp = &softn->ipf_nat_table[0][hv]; 7986 if (*natp) { 7987 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 7988 } else { 7989 NBUMPSIDE(0, ns_inuse); 7990 } 7991 nat->nat_phnext[0] = natp; 7992 nat->nat_hnext[0] = *natp; 7993 *natp = nat; 7994 NBUMPSIDE(0, ns_bucketlen[hv]); 7995 7996 nat->nat_hnext[1] = NULL; 7997 nat->nat_phnext[1] = NULL; 7998 hv = nat->nat_hv[1] % softn->ipf_nat_table_sz; 7999 8000 natp = &softn->ipf_nat_table[1][hv]; 8001 if (*natp) { 8002 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 8003 } else { 8004 NBUMPSIDE(1, ns_inuse); 8005 } 8006 nat->nat_phnext[1] = natp; 8007 nat->nat_hnext[1] = *natp; 8008 *natp = nat; 8009 NBUMPSIDE(1, ns_bucketlen[hv]); 8010 } 8011 RWLOCK_EXIT(&softc->ipf_nat); 8012 8013 return 0; 8014 8015 badrehash: 8016 if (bucketlens[1] != NULL) { 8017 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8018 } 8019 if (bucketlens[0] != NULL) { 8020 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8021 } 8022 if (newtab[0] != NULL) { 8023 KFREES(newtab[0], newsize * sizeof(nat_t *)); 8024 } 8025 if (newtab[1] != NULL) { 8026 KFREES(newtab[1], newsize * sizeof(nat_t *)); 8027 } 8028 IPFERROR(error); 8029 return ENOMEM; 8030 } 8031 8032 8033 /* ------------------------------------------------------------------------ */ 8034 /* Function: ipf_nat_rehash_rules */ 8035 /* Returns: int - 0 = success, else failure */ 8036 /* Parameters: softc(I) - pointer to soft context main structure */ 8037 /* t(I) - pointer to tunable */ 8038 /* p(I) - pointer to new tuning data */ 8039 /* */ 8040 /* All of the NAT rules hang off of a hash table that is searched with a */ 8041 /* hash on address after the netmask is applied. There is a different table*/ 8042 /* for both inbound rules (rdr) and outbound (map.) The resizing will only */ 8043 /* affect one of these two tables. */ 8044 /* ------------------------------------------------------------------------ */ 8045 int 8046 ipf_nat_rehash_rules(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) 8047 { 8048 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8049 ipnat_t **newtab, *np, ***old, **npp; 8050 u_int newsize; 8051 u_int mask; 8052 u_int hv; 8053 8054 newsize = p->ipftu_int; 8055 /* 8056 * In case there is nothing to do... 8057 */ 8058 if (newsize == *t->ipft_pint) 8059 return 0; 8060 8061 /* 8062 * All inbound rules have the NAT_REDIRECT bit set in in_redir and 8063 * all outbound rules have either NAT_MAP or MAT_MAPBLK set. 8064 * This if statement allows for some more generic code to be below, 8065 * rather than two huge gobs of code that almost do the same thing. 8066 */ 8067 if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) { 8068 old = &softn->ipf_nat_rdr_rules; 8069 mask = NAT_REDIRECT; 8070 } else { 8071 old = &softn->ipf_nat_map_rules; 8072 mask = NAT_MAP|NAT_MAPBLK; 8073 } 8074 8075 KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *)); 8076 if (newtab == NULL) { 8077 IPFERROR(60067); 8078 return ENOMEM; 8079 } 8080 8081 bzero((char *)newtab, newsize * sizeof(ipnat_t *)); 8082 8083 WRITE_ENTER(&softc->ipf_nat); 8084 8085 if (*old != NULL) { 8086 KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **)); 8087 } 8088 *old = newtab; 8089 *t->ipft_pint = newsize; 8090 8091 for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) { 8092 if ((np->in_redir & mask) == 0) 8093 continue; 8094 8095 if (np->in_redir & NAT_REDIRECT) { 8096 np->in_rnext = NULL; 8097 hv = np->in_hv[0] % newsize; 8098 for (npp = newtab + hv; *npp != NULL; ) 8099 npp = &(*npp)->in_rnext; 8100 np->in_prnext = npp; 8101 *npp = np; 8102 } 8103 if (np->in_redir & NAT_MAP) { 8104 np->in_mnext = NULL; 8105 hv = np->in_hv[1] % newsize; 8106 for (npp = newtab + hv; *npp != NULL; ) 8107 npp = &(*npp)->in_mnext; 8108 np->in_pmnext = npp; 8109 *npp = np; 8110 } 8111 8112 } 8113 RWLOCK_EXIT(&softc->ipf_nat); 8114 8115 return 0; 8116 } 8117 8118 8119 /* ------------------------------------------------------------------------ */ 8120 /* Function: ipf_nat_hostmap_rehash */ 8121 /* Returns: int - 0 = success, else failure */ 8122 /* Parameters: softc(I) - pointer to soft context main structure */ 8123 /* t(I) - pointer to tunable */ 8124 /* p(I) - pointer to new tuning data */ 8125 /* */ 8126 /* Allocate and populate a new hash table that will contain a reference to */ 8127 /* all of the active IP# translations currently in place. */ 8128 /* ------------------------------------------------------------------------ */ 8129 int 8130 ipf_nat_hostmap_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, 8131 ipftuneval_t *p) 8132 { 8133 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8134 hostmap_t *hm, **newtab; 8135 u_int newsize; 8136 u_int hv; 8137 8138 newsize = p->ipftu_int; 8139 /* 8140 * In case there is nothing to do... 8141 */ 8142 if (newsize == *t->ipft_pint) 8143 return 0; 8144 8145 KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *)); 8146 if (newtab == NULL) { 8147 IPFERROR(60068); 8148 return ENOMEM; 8149 } 8150 8151 bzero((char *)newtab, newsize * sizeof(hostmap_t *)); 8152 8153 WRITE_ENTER(&softc->ipf_nat); 8154 if (softn->ipf_hm_maptable != NULL) { 8155 KFREES(softn->ipf_hm_maptable, 8156 softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *)); 8157 } 8158 softn->ipf_hm_maptable = newtab; 8159 softn->ipf_nat_hostmap_sz = newsize; 8160 8161 for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) { 8162 hv = hm->hm_hv % softn->ipf_nat_hostmap_sz; 8163 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 8164 hm->hm_phnext = softn->ipf_hm_maptable + hv; 8165 if (softn->ipf_hm_maptable[hv] != NULL) 8166 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 8167 softn->ipf_hm_maptable[hv] = hm; 8168 } 8169 RWLOCK_EXIT(&softc->ipf_nat); 8170 8171 return 0; 8172 } 8173 8174 8175 /* ------------------------------------------------------------------------ */ 8176 /* Function: ipf_nat_add_tq */ 8177 /* Parameters: softc(I) - pointer to soft context main structure */ 8178 /* */ 8179 /* ------------------------------------------------------------------------ */ 8180 ipftq_t * 8181 ipf_nat_add_tq(ipf_main_softc_t *softc, int ttl) 8182 { 8183 ipf_nat_softc_t *softs = softc->ipf_nat_soft; 8184 8185 return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl); 8186 } 8187 8188 /* ------------------------------------------------------------------------ */ 8189 /* Function: ipf_nat_uncreate */ 8190 /* Returns: Nil */ 8191 /* Parameters: fin(I) - pointer to packet information */ 8192 /* */ 8193 /* This function is used to remove a NAT entry from the NAT table when we */ 8194 /* decide that the create was actually in error. It is thus assumed that */ 8195 /* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */ 8196 /* with the translated packet (not the original), we have to reverse the */ 8197 /* lookup. Although doing the lookup is expensive (relatively speaking), it */ 8198 /* is not anticipated that this will be a frequent occurance for normal */ 8199 /* traffic patterns. */ 8200 /* ------------------------------------------------------------------------ */ 8201 void 8202 ipf_nat_uncreate(fr_info_t *fin) 8203 { 8204 ipf_main_softc_t *softc = fin->fin_main_soft; 8205 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8206 int nflags; 8207 nat_t *nat; 8208 8209 switch (fin->fin_p) 8210 { 8211 case IPPROTO_TCP : 8212 nflags = IPN_TCP; 8213 break; 8214 case IPPROTO_UDP : 8215 nflags = IPN_UDP; 8216 break; 8217 default : 8218 nflags = 0; 8219 break; 8220 } 8221 8222 WRITE_ENTER(&softc->ipf_nat); 8223 8224 if (fin->fin_out == 0) { 8225 nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 8226 fin->fin_dst, fin->fin_src); 8227 } else { 8228 nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 8229 fin->fin_src, fin->fin_dst); 8230 } 8231 8232 if (nat != NULL) { 8233 NBUMPSIDE(fin->fin_out, ns_uncreate[0]); 8234 ipf_nat_delete(softc, nat, NL_DESTROY); 8235 } else { 8236 NBUMPSIDE(fin->fin_out, ns_uncreate[1]); 8237 } 8238 8239 RWLOCK_EXIT(&softc->ipf_nat); 8240 } 8241 8242 8243 /* ------------------------------------------------------------------------ */ 8244 /* Function: ipf_nat_cmp_rules */ 8245 /* Returns: int - 0 == success, else rules do not match. */ 8246 /* Parameters: n1(I) - first rule to compare */ 8247 /* n2(I) - first rule to compare */ 8248 /* */ 8249 /* Compare two rules using pointers to each rule. A straight bcmp will not */ 8250 /* work as some fields (such as in_dst, in_pkts) actually do change once */ 8251 /* the rule has been loaded into the kernel. Whilst this function returns */ 8252 /* various non-zero returns, they're strictly to aid in debugging. Use of */ 8253 /* this function should simply care if the result is zero or not. */ 8254 /* ------------------------------------------------------------------------ */ 8255 static int 8256 ipf_nat_cmp_rules(ipnat_t *n1, ipnat_t *n2) 8257 { 8258 if (n1->in_size != n2->in_size) 8259 return 1; 8260 8261 if (bcmp((char *)&n1->in_v, (char *)&n2->in_v, 8262 offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0) 8263 return 2; 8264 8265 if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc, 8266 n1->in_size - offsetof(ipnat_t, in_tuc)) != 0) 8267 return 3; 8268 if (n1->in_ndst.na_atype != n2->in_ndst.na_atype) 8269 return 5; 8270 if (n1->in_ndst.na_function != n2->in_ndst.na_function) 8271 return 6; 8272 if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr, 8273 sizeof(n1->in_ndst.na_addr))) 8274 return 7; 8275 if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype) 8276 return 8; 8277 if (n1->in_nsrc.na_function != n2->in_nsrc.na_function) 8278 return 9; 8279 if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr, 8280 sizeof(n1->in_nsrc.na_addr))) 8281 return 10; 8282 if (n1->in_odst.na_atype != n2->in_odst.na_atype) 8283 return 11; 8284 if (n1->in_odst.na_function != n2->in_odst.na_function) 8285 return 12; 8286 if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr, 8287 sizeof(n1->in_odst.na_addr))) 8288 return 13; 8289 if (n1->in_osrc.na_atype != n2->in_osrc.na_atype) 8290 return 14; 8291 if (n1->in_osrc.na_function != n2->in_osrc.na_function) 8292 return 15; 8293 if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr, 8294 sizeof(n1->in_osrc.na_addr))) 8295 return 16; 8296 return 0; 8297 } 8298 8299 8300 /* ------------------------------------------------------------------------ */ 8301 /* Function: ipf_nat_rule_init */ 8302 /* Returns: int - 0 == success, else rules do not match. */ 8303 /* Parameters: softc(I) - pointer to soft context main structure */ 8304 /* softn(I) - pointer to NAT context structure */ 8305 /* n(I) - first rule to compare */ 8306 /* */ 8307 /* ------------------------------------------------------------------------ */ 8308 static int 8309 ipf_nat_rule_init(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n) 8310 { 8311 int error = 0; 8312 8313 if ((n->in_flags & IPN_SIPRANGE) != 0) 8314 n->in_nsrcatype = FRI_RANGE; 8315 8316 if ((n->in_flags & IPN_DIPRANGE) != 0) 8317 n->in_ndstatype = FRI_RANGE; 8318 8319 if ((n->in_flags & IPN_SPLIT) != 0) 8320 n->in_ndstatype = FRI_SPLIT; 8321 8322 if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0) 8323 n->in_spnext = n->in_spmin; 8324 8325 if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) { 8326 n->in_dpnext = n->in_dpmin; 8327 } else if (n->in_redir == NAT_REDIRECT) { 8328 n->in_dpnext = n->in_dpmin; 8329 } 8330 8331 n->in_stepnext = 0; 8332 8333 switch (n->in_v[0]) 8334 { 8335 case 4 : 8336 error = ipf_nat_ruleaddrinit(softc, softn, n); 8337 if (error != 0) 8338 return error; 8339 break; 8340 #ifdef USE_INET6 8341 case 6 : 8342 error = ipf_nat6_ruleaddrinit(softc, softn, n); 8343 if (error != 0) 8344 return error; 8345 break; 8346 #endif 8347 default : 8348 break; 8349 } 8350 8351 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 8352 /* 8353 * Prerecord whether or not the destination of the divert 8354 * is local or not to the interface the packet is going 8355 * to be sent out. 8356 */ 8357 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 8358 n->in_ifps[1], &n->in_ndstip6); 8359 } 8360 8361 return error; 8362 } 8363 8364 8365 /* ------------------------------------------------------------------------ */ 8366 /* Function: ipf_nat_rule_fini */ 8367 /* Returns: int - 0 == success, else rules do not match. */ 8368 /* Parameters: softc(I) - pointer to soft context main structure */ 8369 /* n(I) - rule to work on */ 8370 /* */ 8371 /* This function is used to release any objects that were referenced during */ 8372 /* the rule initialisation. This is useful both when free'ing the rule and */ 8373 /* when handling ioctls that need to initialise these fields but not */ 8374 /* actually use them after the ioctl processing has finished. */ 8375 /* ------------------------------------------------------------------------ */ 8376 static void 8377 ipf_nat_rule_fini(ipf_main_softc_t *softc, ipnat_t *n) 8378 { 8379 if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL) 8380 ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr); 8381 8382 if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL) 8383 ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr); 8384 8385 if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL) 8386 ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr); 8387 8388 if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL) 8389 ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr); 8390 8391 if (n->in_divmp != NULL) 8392 FREE_MB_T(n->in_divmp); 8393 } 8394
Indexes created Thu Oct 23 22:10:10 GMT 2025