ip_nat.c revision 338170
1/* $FreeBSD: stable/10/sys/contrib/ipfilter/netinet/ip_nat.c 338170 2018-08-22 01:23:11Z cy $ */ 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__ 29struct 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> 80extern 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) 114static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed"; 115static const char rcsid[] = "@(#)$FreeBSD: stable/10/sys/contrib/ipfilter/netinet/ip_nat.c 338170 2018-08-22 01:23:11Z cy $"; 116/* static const char rcsid[] = "@(#)$Id: ip_nat.c,v 2.195.2.102 2007/10/16 10:08:10 darrenr Exp $"; */ 117#endif 118 119 120#define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \ 121 (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3]) 122#define NBUMP(x) softn->(x)++ 123#define NBUMPD(x, y) do { \ 124 softn->x.y++; \ 125 DT(y); \ 126 } while (0) 127#define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++ 128#define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \ 129 DT(x); } while (0) 130#define NBUMPSIDEX(y,x,z) \ 131 do { softn->ipf_nat_stats.ns_side[y].x++; \ 132 DT(z); } while (0) 133#define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \ 134 DT1(x, fr_info_t *, fin); } while (0) 135 136frentry_t ipfnatblock; 137 138static ipftuneable_t ipf_nat_tuneables[] = { 139 /* nat */ 140 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) }, 141 "nat_lock", 0, 1, 142 stsizeof(ipf_nat_softc_t, ipf_nat_lock), 143 IPFT_RDONLY, NULL, NULL }, 144 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) }, 145 "nat_table_size", 1, 0x7fffffff, 146 stsizeof(ipf_nat_softc_t, ipf_nat_table_sz), 147 0, NULL, ipf_nat_rehash }, 148 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) }, 149 "nat_table_max", 1, 0x7fffffff, 150 stsizeof(ipf_nat_softc_t, ipf_nat_table_max), 151 0, NULL, NULL }, 152 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) }, 153 "nat_rules_size", 1, 0x7fffffff, 154 stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz), 155 0, NULL, ipf_nat_rehash_rules }, 156 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) }, 157 "rdr_rules_size", 1, 0x7fffffff, 158 stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz), 159 0, NULL, ipf_nat_rehash_rules }, 160 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) }, 161 "hostmap_size", 1, 0x7fffffff, 162 stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz), 163 0, NULL, ipf_nat_hostmap_rehash }, 164 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) }, 165 "nat_maxbucket",1, 0x7fffffff, 166 stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket), 167 0, NULL, NULL }, 168 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) }, 169 "nat_logging", 0, 1, 170 stsizeof(ipf_nat_softc_t, ipf_nat_logging), 171 0, NULL, NULL }, 172 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) }, 173 "nat_doflush", 0, 1, 174 stsizeof(ipf_nat_softc_t, ipf_nat_doflush), 175 0, NULL, NULL }, 176 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) }, 177 "nat_table_wm_low", 1, 99, 178 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low), 179 0, NULL, NULL }, 180 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) }, 181 "nat_table_wm_high", 2, 100, 182 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high), 183 0, NULL, NULL }, 184 { { 0 }, 185 NULL, 0, 0, 186 0, 187 0, NULL, NULL } 188}; 189 190/* ======================================================================== */ 191/* How the NAT is organised and works. */ 192/* */ 193/* Inside (interface y) NAT Outside (interface x) */ 194/* -------------------- -+- ------------------------------------- */ 195/* Packet going | out, processsed by ipf_nat_checkout() for x */ 196/* ------------> | ------------> */ 197/* src=10.1.1.1 | src=192.1.1.1 */ 198/* | */ 199/* | in, processed by ipf_nat_checkin() for x */ 200/* <------------ | <------------ */ 201/* dst=10.1.1.1 | dst=192.1.1.1 */ 202/* -------------------- -+- ------------------------------------- */ 203/* ipf_nat_checkout() - changes ip_src and if required, sport */ 204/* - creates a new mapping, if required. */ 205/* ipf_nat_checkin() - changes ip_dst and if required, dport */ 206/* */ 207/* In the NAT table, internal source is recorded as "in" and externally */ 208/* seen as "out". */ 209/* ======================================================================== */ 210 211 212#if SOLARIS && !defined(INSTANCES) 213extern int pfil_delayed_copy; 214#endif 215 216static int ipf_nat_flush_entry __P((ipf_main_softc_t *, void *)); 217static int ipf_nat_getent __P((ipf_main_softc_t *, caddr_t, int)); 218static int ipf_nat_getsz __P((ipf_main_softc_t *, caddr_t, int)); 219static int ipf_nat_putent __P((ipf_main_softc_t *, caddr_t, int)); 220static void ipf_nat_addmap __P((ipf_nat_softc_t *, ipnat_t *)); 221static void ipf_nat_addrdr __P((ipf_nat_softc_t *, ipnat_t *)); 222static int ipf_nat_builddivertmp __P((ipf_nat_softc_t *, ipnat_t *)); 223static int ipf_nat_clearlist __P((ipf_main_softc_t *, ipf_nat_softc_t *)); 224static int ipf_nat_cmp_rules __P((ipnat_t *, ipnat_t *)); 225static int ipf_nat_decap __P((fr_info_t *, nat_t *)); 226static void ipf_nat_delrule __P((ipf_main_softc_t *, ipf_nat_softc_t *, 227 ipnat_t *, int)); 228static int ipf_nat_extraflush __P((ipf_main_softc_t *, ipf_nat_softc_t *, int)); 229static int ipf_nat_finalise __P((fr_info_t *, nat_t *)); 230static int ipf_nat_flushtable __P((ipf_main_softc_t *, ipf_nat_softc_t *)); 231static int ipf_nat_getnext __P((ipf_main_softc_t *, ipftoken_t *, 232 ipfgeniter_t *, ipfobj_t *)); 233static int ipf_nat_gettable __P((ipf_main_softc_t *, ipf_nat_softc_t *, 234 char *)); 235static hostmap_t *ipf_nat_hostmap __P((ipf_nat_softc_t *, ipnat_t *, 236 struct in_addr, struct in_addr, 237 struct in_addr, u_32_t)); 238static int ipf_nat_icmpquerytype __P((int)); 239static int ipf_nat_iterator __P((ipf_main_softc_t *, ipftoken_t *, 240 ipfgeniter_t *, ipfobj_t *)); 241static int ipf_nat_match __P((fr_info_t *, ipnat_t *)); 242static int ipf_nat_matcharray __P((nat_t *, int *, u_long)); 243static int ipf_nat_matchflush __P((ipf_main_softc_t *, ipf_nat_softc_t *, 244 caddr_t)); 245static void ipf_nat_mssclamp __P((tcphdr_t *, u_32_t, fr_info_t *, 246 u_short *)); 247static int ipf_nat_newmap __P((fr_info_t *, nat_t *, natinfo_t *)); 248static int ipf_nat_newdivert __P((fr_info_t *, nat_t *, natinfo_t *)); 249static int ipf_nat_newrdr __P((fr_info_t *, nat_t *, natinfo_t *)); 250static int ipf_nat_newrewrite __P((fr_info_t *, nat_t *, natinfo_t *)); 251static int ipf_nat_nextaddr __P((fr_info_t *, nat_addr_t *, u_32_t *, 252 u_32_t *)); 253static int ipf_nat_nextaddrinit __P((ipf_main_softc_t *, char *, 254 nat_addr_t *, int, void *)); 255static int ipf_nat_resolverule __P((ipf_main_softc_t *, ipnat_t *)); 256static int ipf_nat_ruleaddrinit __P((ipf_main_softc_t *, 257 ipf_nat_softc_t *, ipnat_t *)); 258static void ipf_nat_rule_fini __P((ipf_main_softc_t *, ipnat_t *)); 259static int ipf_nat_rule_init __P((ipf_main_softc_t *, ipf_nat_softc_t *, 260 ipnat_t *)); 261static int ipf_nat_siocaddnat __P((ipf_main_softc_t *, ipf_nat_softc_t *, 262 ipnat_t *, int)); 263static void ipf_nat_siocdelnat __P((ipf_main_softc_t *, ipf_nat_softc_t *, 264 ipnat_t *, int)); 265static void ipf_nat_tabmove __P((ipf_nat_softc_t *, nat_t *)); 266 267/* ------------------------------------------------------------------------ */ 268/* Function: ipf_nat_main_load */ 269/* Returns: int - 0 == success, -1 == failure */ 270/* Parameters: Nil */ 271/* */ 272/* The only global NAT structure that needs to be initialised is the filter */ 273/* rule that is used with blocking packets. */ 274/* ------------------------------------------------------------------------ */ 275int 276ipf_nat_main_load() 277{ 278 bzero((char *)&ipfnatblock, sizeof(ipfnatblock)); 279 ipfnatblock.fr_flags = FR_BLOCK|FR_QUICK; 280 ipfnatblock.fr_ref = 1; 281 282 return 0; 283} 284 285 286/* ------------------------------------------------------------------------ */ 287/* Function: ipf_nat_main_unload */ 288/* Returns: int - 0 == success, -1 == failure */ 289/* Parameters: Nil */ 290/* */ 291/* A null-op function that exists as a placeholder so that the flow in */ 292/* other functions is obvious. */ 293/* ------------------------------------------------------------------------ */ 294int 295ipf_nat_main_unload() 296{ 297 return 0; 298} 299 300 301/* ------------------------------------------------------------------------ */ 302/* Function: ipf_nat_soft_create */ 303/* Returns: void * - NULL = failure, else pointer to NAT context */ 304/* Parameters: softc(I) - pointer to soft context main structure */ 305/* */ 306/* Allocate the initial soft context structure for NAT and populate it with */ 307/* some default values. Creating the tables is left until we call _init so */ 308/* that sizes can be changed before we get under way. */ 309/* ------------------------------------------------------------------------ */ 310void * 311ipf_nat_soft_create(softc) 312 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/* ------------------------------------------------------------------------ */ 363void 364ipf_nat_soft_destroy(softc, arg) 365 ipf_main_softc_t *softc; 366 void *arg; 367{ 368 ipf_nat_softc_t *softn = arg; 369 370 if (softn->ipf_nat_tune != NULL) { 371 ipf_tune_array_unlink(softc, softn->ipf_nat_tune); 372 KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables)); 373 softn->ipf_nat_tune = NULL; 374 } 375 376 KFREE(softn); 377} 378 379 380/* ------------------------------------------------------------------------ */ 381/* Function: ipf_nat_init */ 382/* Returns: int - 0 == success, -1 == failure */ 383/* Parameters: softc(I) - pointer to soft context main structure */ 384/* */ 385/* Initialise all of the NAT locks, tables and other structures. */ 386/* ------------------------------------------------------------------------ */ 387int 388ipf_nat_soft_init(softc, arg) 389 ipf_main_softc_t *softc; 390 void *arg; 391{ 392 ipf_nat_softc_t *softn = arg; 393 ipftq_t *tq; 394 int i; 395 396 KMALLOCS(softn->ipf_nat_table[0], nat_t **, \ 397 sizeof(nat_t *) * softn->ipf_nat_table_sz); 398 399 if (softn->ipf_nat_table[0] != NULL) { 400 bzero((char *)softn->ipf_nat_table[0], 401 softn->ipf_nat_table_sz * sizeof(nat_t *)); 402 } else { 403 return -1; 404 } 405 406 KMALLOCS(softn->ipf_nat_table[1], nat_t **, \ 407 sizeof(nat_t *) * softn->ipf_nat_table_sz); 408 409 if (softn->ipf_nat_table[1] != NULL) { 410 bzero((char *)softn->ipf_nat_table[1], 411 softn->ipf_nat_table_sz * sizeof(nat_t *)); 412 } else { 413 return -2; 414 } 415 416 KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \ 417 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 418 419 if (softn->ipf_nat_map_rules != NULL) { 420 bzero((char *)softn->ipf_nat_map_rules, 421 softn->ipf_nat_maprules_sz * sizeof(ipnat_t *)); 422 } else { 423 return -3; 424 } 425 426 KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \ 427 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 428 429 if (softn->ipf_nat_rdr_rules != NULL) { 430 bzero((char *)softn->ipf_nat_rdr_rules, 431 softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *)); 432 } else { 433 return -4; 434 } 435 436 KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \ 437 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 438 439 if (softn->ipf_hm_maptable != NULL) { 440 bzero((char *)softn->ipf_hm_maptable, 441 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 442 } else { 443 return -5; 444 } 445 softn->ipf_hm_maplist = NULL; 446 447 KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *, 448 softn->ipf_nat_table_sz * sizeof(u_int)); 449 450 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) { 451 return -6; 452 } 453 bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 454 softn->ipf_nat_table_sz * sizeof(u_int)); 455 456 KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *, 457 softn->ipf_nat_table_sz * sizeof(u_int)); 458 459 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) { 460 return -7; 461 } 462 463 bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 464 softn->ipf_nat_table_sz * sizeof(u_int)); 465 466 if (softn->ipf_nat_maxbucket == 0) { 467 for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1) 468 softn->ipf_nat_maxbucket++; 469 softn->ipf_nat_maxbucket *= 2; 470 } 471 472 ipf_sttab_init(softc, softn->ipf_nat_tcptq); 473 /* 474 * Increase this because we may have "keep state" following this too 475 * and packet storms can occur if this is removed too quickly. 476 */ 477 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 478 softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next = 479 &softn->ipf_nat_udptq; 480 481 IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage, 482 "nat ipftq udp tab"); 483 softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq; 484 485 IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage, 486 "nat ipftq udpack tab"); 487 softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq; 488 489 IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage, 490 "nat icmp ipftq tab"); 491 softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq; 492 493 IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage, 494 "nat icmpack ipftq tab"); 495 softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq; 496 497 IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage, 498 "nat ip ipftq tab"); 499 softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending; 500 501 IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab"); 502 softn->ipf_nat_pending.ifq_next = NULL; 503 504 for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) { 505 if (tq->ifq_ttl < softn->ipf_nat_deficmpage) 506 tq->ifq_ttl = softn->ipf_nat_deficmpage; 507#ifdef LARGE_NAT 508 else if (tq->ifq_ttl > softn->ipf_nat_defage) 509 tq->ifq_ttl = softn->ipf_nat_defage; 510#endif 511 } 512 513 /* 514 * Increase this because we may have "keep state" following 515 * this too and packet storms can occur if this is removed 516 * too quickly. 517 */ 518 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 519 520 MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex"); 521 MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex"); 522 523 softn->ipf_nat_inited = 1; 524 525 return 0; 526} 527 528 529/* ------------------------------------------------------------------------ */ 530/* Function: ipf_nat_soft_fini */ 531/* Returns: Nil */ 532/* Parameters: softc(I) - pointer to soft context main structure */ 533/* */ 534/* Free all memory used by NAT structures allocated at runtime. */ 535/* ------------------------------------------------------------------------ */ 536int 537ipf_nat_soft_fini(softc, arg) 538 ipf_main_softc_t *softc; 539 void *arg; 540{ 541 ipf_nat_softc_t *softn = arg; 542 ipftq_t *ifq, *ifqnext; 543 544 (void) ipf_nat_clearlist(softc, softn); 545 (void) ipf_nat_flushtable(softc, softn); 546 547 /* 548 * Proxy timeout queues are not cleaned here because although they 549 * exist on the NAT list, ipf_proxy_unload is called after unload 550 * and the proxies actually are responsible for them being created. 551 * Should the proxy timeouts have their own list? There's no real 552 * justification as this is the only complication. 553 */ 554 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 555 ifqnext = ifq->ifq_next; 556 if (ipf_deletetimeoutqueue(ifq) == 0) 557 ipf_freetimeoutqueue(softc, ifq); 558 } 559 560 if (softn->ipf_nat_table[0] != NULL) { 561 KFREES(softn->ipf_nat_table[0], 562 sizeof(nat_t *) * softn->ipf_nat_table_sz); 563 softn->ipf_nat_table[0] = NULL; 564 } 565 if (softn->ipf_nat_table[1] != NULL) { 566 KFREES(softn->ipf_nat_table[1], 567 sizeof(nat_t *) * softn->ipf_nat_table_sz); 568 softn->ipf_nat_table[1] = NULL; 569 } 570 if (softn->ipf_nat_map_rules != NULL) { 571 KFREES(softn->ipf_nat_map_rules, 572 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 573 softn->ipf_nat_map_rules = NULL; 574 } 575 if (softn->ipf_nat_rdr_rules != NULL) { 576 KFREES(softn->ipf_nat_rdr_rules, 577 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 578 softn->ipf_nat_rdr_rules = NULL; 579 } 580 if (softn->ipf_hm_maptable != NULL) { 581 KFREES(softn->ipf_hm_maptable, 582 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 583 softn->ipf_hm_maptable = NULL; 584 } 585 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 586 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 587 sizeof(u_int) * softn->ipf_nat_table_sz); 588 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL; 589 } 590 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 591 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 592 sizeof(u_int) * softn->ipf_nat_table_sz); 593 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL; 594 } 595 596 if (softn->ipf_nat_inited == 1) { 597 softn->ipf_nat_inited = 0; 598 ipf_sttab_destroy(softn->ipf_nat_tcptq); 599 600 MUTEX_DESTROY(&softn->ipf_nat_new); 601 MUTEX_DESTROY(&softn->ipf_nat_io); 602 603 MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock); 604 MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock); 605 MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock); 606 MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock); 607 MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock); 608 MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock); 609 } 610 611 return 0; 612} 613 614 615/* ------------------------------------------------------------------------ */ 616/* Function: ipf_nat_setlock */ 617/* Returns: Nil */ 618/* Parameters: arg(I) - pointer to soft state information */ 619/* tmp(I) - new lock value */ 620/* */ 621/* Set the "lock status" of NAT to the value in tmp. */ 622/* ------------------------------------------------------------------------ */ 623void 624ipf_nat_setlock(arg, tmp) 625 void *arg; 626 int tmp; 627{ 628 ipf_nat_softc_t *softn = arg; 629 630 softn->ipf_nat_lock = tmp; 631} 632 633 634/* ------------------------------------------------------------------------ */ 635/* Function: ipf_nat_addrdr */ 636/* Returns: Nil */ 637/* Parameters: n(I) - pointer to NAT rule to add */ 638/* */ 639/* Adds a redirect rule to the hash table of redirect rules and the list of */ 640/* loaded NAT rules. Updates the bitmask indicating which netmasks are in */ 641/* use by redirect rules. */ 642/* ------------------------------------------------------------------------ */ 643static void 644ipf_nat_addrdr(softn, n) 645 ipf_nat_softc_t *softn; 646 ipnat_t *n; 647{ 648 ipnat_t **np; 649 u_32_t j; 650 u_int hv; 651 u_int rhv; 652 int k; 653 654 if (n->in_odstatype == FRI_NORMAL) { 655 k = count4bits(n->in_odstmsk); 656 ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask); 657 j = (n->in_odstaddr & n->in_odstmsk); 658 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 659 } else { 660 ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask); 661 j = 0; 662 rhv = 0; 663 } 664 hv = rhv % softn->ipf_nat_rdrrules_sz; 665 np = softn->ipf_nat_rdr_rules + hv; 666 while (*np != NULL) 667 np = &(*np)->in_rnext; 668 n->in_rnext = NULL; 669 n->in_prnext = np; 670 n->in_hv[0] = hv; 671 n->in_use++; 672 *np = n; 673} 674 675 676/* ------------------------------------------------------------------------ */ 677/* Function: ipf_nat_addmap */ 678/* Returns: Nil */ 679/* Parameters: n(I) - pointer to NAT rule to add */ 680/* */ 681/* Adds a NAT map rule to the hash table of rules and the list of loaded */ 682/* NAT rules. Updates the bitmask indicating which netmasks are in use by */ 683/* redirect rules. */ 684/* ------------------------------------------------------------------------ */ 685static void 686ipf_nat_addmap(softn, n) 687 ipf_nat_softc_t *softn; 688 ipnat_t *n; 689{ 690 ipnat_t **np; 691 u_32_t j; 692 u_int hv; 693 u_int rhv; 694 int k; 695 696 if (n->in_osrcatype == FRI_NORMAL) { 697 k = count4bits(n->in_osrcmsk); 698 ipf_inet_mask_add(k, &softn->ipf_nat_map_mask); 699 j = (n->in_osrcaddr & n->in_osrcmsk); 700 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 701 } else { 702 ipf_inet_mask_add(0, &softn->ipf_nat_map_mask); 703 j = 0; 704 rhv = 0; 705 } 706 hv = rhv % softn->ipf_nat_maprules_sz; 707 np = softn->ipf_nat_map_rules + hv; 708 while (*np != NULL) 709 np = &(*np)->in_mnext; 710 n->in_mnext = NULL; 711 n->in_pmnext = np; 712 n->in_hv[1] = rhv; 713 n->in_use++; 714 *np = n; 715} 716 717 718/* ------------------------------------------------------------------------ */ 719/* Function: ipf_nat_delrdr */ 720/* Returns: Nil */ 721/* Parameters: n(I) - pointer to NAT rule to delete */ 722/* */ 723/* Removes a redirect rule from the hash table of redirect rules. */ 724/* ------------------------------------------------------------------------ */ 725void 726ipf_nat_delrdr(softn, n) 727 ipf_nat_softc_t *softn; 728 ipnat_t *n; 729{ 730 if (n->in_odstatype == FRI_NORMAL) { 731 int k = count4bits(n->in_odstmsk); 732 ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask); 733 } else { 734 ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask); 735 } 736 if (n->in_rnext) 737 n->in_rnext->in_prnext = n->in_prnext; 738 *n->in_prnext = n->in_rnext; 739 n->in_use--; 740} 741 742 743/* ------------------------------------------------------------------------ */ 744/* Function: ipf_nat_delmap */ 745/* Returns: Nil */ 746/* Parameters: n(I) - pointer to NAT rule to delete */ 747/* */ 748/* Removes a NAT map rule from the hash table of NAT map rules. */ 749/* ------------------------------------------------------------------------ */ 750void 751ipf_nat_delmap(softn, n) 752 ipf_nat_softc_t *softn; 753 ipnat_t *n; 754{ 755 if (n->in_osrcatype == FRI_NORMAL) { 756 int k = count4bits(n->in_osrcmsk); 757 ipf_inet_mask_del(k, &softn->ipf_nat_map_mask); 758 } else { 759 ipf_inet_mask_del(0, &softn->ipf_nat_map_mask); 760 } 761 if (n->in_mnext != NULL) 762 n->in_mnext->in_pmnext = n->in_pmnext; 763 *n->in_pmnext = n->in_mnext; 764 n->in_use--; 765} 766 767 768/* ------------------------------------------------------------------------ */ 769/* Function: ipf_nat_hostmap */ 770/* Returns: struct hostmap* - NULL if no hostmap could be created, */ 771/* else a pointer to the hostmapping to use */ 772/* Parameters: np(I) - pointer to NAT rule */ 773/* real(I) - real IP address */ 774/* map(I) - mapped IP address */ 775/* port(I) - destination port number */ 776/* Write Locks: ipf_nat */ 777/* */ 778/* Check if an ip address has already been allocated for a given mapping */ 779/* that is not doing port based translation. If is not yet allocated, then */ 780/* create a new entry if a non-NULL NAT rule pointer has been supplied. */ 781/* ------------------------------------------------------------------------ */ 782static struct hostmap * 783ipf_nat_hostmap(softn, np, src, dst, map, port) 784 ipf_nat_softc_t *softn; 785 ipnat_t *np; 786 struct in_addr src; 787 struct in_addr dst; 788 struct in_addr map; 789 u_32_t port; 790{ 791 hostmap_t *hm; 792 u_int hv, rhv; 793 794 hv = (src.s_addr ^ dst.s_addr); 795 hv += src.s_addr; 796 hv += dst.s_addr; 797 rhv = hv; 798 hv %= softn->ipf_nat_hostmap_sz; 799 for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext) 800 if ((hm->hm_osrcip.s_addr == src.s_addr) && 801 (hm->hm_odstip.s_addr == dst.s_addr) && 802 ((np == NULL) || (np == hm->hm_ipnat)) && 803 ((port == 0) || (port == hm->hm_port))) { 804 softn->ipf_nat_stats.ns_hm_addref++; 805 hm->hm_ref++; 806 return hm; 807 } 808 809 if (np == NULL) { 810 softn->ipf_nat_stats.ns_hm_nullnp++; 811 return NULL; 812 } 813 814 KMALLOC(hm, hostmap_t *); 815 if (hm) { 816 hm->hm_next = softn->ipf_hm_maplist; 817 hm->hm_pnext = &softn->ipf_hm_maplist; 818 if (softn->ipf_hm_maplist != NULL) 819 softn->ipf_hm_maplist->hm_pnext = &hm->hm_next; 820 softn->ipf_hm_maplist = hm; 821 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 822 hm->hm_phnext = softn->ipf_hm_maptable + hv; 823 if (softn->ipf_hm_maptable[hv] != NULL) 824 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 825 softn->ipf_hm_maptable[hv] = hm; 826 hm->hm_ipnat = np; 827 np->in_use++; 828 hm->hm_osrcip = src; 829 hm->hm_odstip = dst; 830 hm->hm_nsrcip = map; 831 hm->hm_ndstip.s_addr = 0; 832 hm->hm_ref = 1; 833 hm->hm_port = port; 834 hm->hm_hv = rhv; 835 hm->hm_v = 4; 836 softn->ipf_nat_stats.ns_hm_new++; 837 } else { 838 softn->ipf_nat_stats.ns_hm_newfail++; 839 } 840 return hm; 841} 842 843 844/* ------------------------------------------------------------------------ */ 845/* Function: ipf_nat_hostmapdel */ 846/* Returns: Nil */ 847/* Parameters: hmp(I) - pointer to hostmap structure pointer */ 848/* Write Locks: ipf_nat */ 849/* */ 850/* Decrement the references to this hostmap structure by one. If this */ 851/* reaches zero then remove it and free it. */ 852/* ------------------------------------------------------------------------ */ 853void 854ipf_nat_hostmapdel(softc, hmp) 855 ipf_main_softc_t *softc; 856 struct hostmap **hmp; 857{ 858 struct hostmap *hm; 859 860 hm = *hmp; 861 *hmp = NULL; 862 863 hm->hm_ref--; 864 if (hm->hm_ref == 0) { 865 ipf_nat_rule_deref(softc, &hm->hm_ipnat); 866 if (hm->hm_hnext) 867 hm->hm_hnext->hm_phnext = hm->hm_phnext; 868 *hm->hm_phnext = hm->hm_hnext; 869 if (hm->hm_next) 870 hm->hm_next->hm_pnext = hm->hm_pnext; 871 *hm->hm_pnext = hm->hm_next; 872 KFREE(hm); 873 } 874} 875 876 877/* ------------------------------------------------------------------------ */ 878/* Function: ipf_fix_outcksum */ 879/* Returns: Nil */ 880/* Parameters: fin(I) - pointer to packet information */ 881/* sp(I) - location of 16bit checksum to update */ 882/* n((I) - amount to adjust checksum by */ 883/* */ 884/* Adjusts the 16bit checksum by "n" for packets going out. */ 885/* ------------------------------------------------------------------------ */ 886void 887ipf_fix_outcksum(cksum, sp, n, partial) 888 int cksum; 889 u_short *sp; 890 u_32_t n, partial; 891{ 892 u_short sumshort; 893 u_32_t sum1; 894 895 if (n == 0) 896 return; 897 898 if (cksum == 4) { 899 *sp = 0; 900 return; 901 } 902 if (cksum == 2) { 903 sum1 = partial; 904 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 905 *sp = htons(sum1); 906 return; 907 } 908 sum1 = (~ntohs(*sp)) & 0xffff; 909 sum1 += (n); 910 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 911 /* Again */ 912 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 913 sumshort = ~(u_short)sum1; 914 *(sp) = htons(sumshort); 915} 916 917 918/* ------------------------------------------------------------------------ */ 919/* Function: ipf_fix_incksum */ 920/* Returns: Nil */ 921/* Parameters: fin(I) - pointer to packet information */ 922/* sp(I) - location of 16bit checksum to update */ 923/* n((I) - amount to adjust checksum by */ 924/* */ 925/* Adjusts the 16bit checksum by "n" for packets going in. */ 926/* ------------------------------------------------------------------------ */ 927void 928ipf_fix_incksum(cksum, sp, n, partial) 929 int cksum; 930 u_short *sp; 931 u_32_t n, partial; 932{ 933 u_short sumshort; 934 u_32_t sum1; 935 936 if (n == 0) 937 return; 938 939 if (cksum == 4) { 940 *sp = 0; 941 return; 942 } 943 if (cksum == 2) { 944 sum1 = partial; 945 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 946 *sp = htons(sum1); 947 return; 948 } 949 950 sum1 = (~ntohs(*sp)) & 0xffff; 951 sum1 += ~(n) & 0xffff; 952 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 953 /* Again */ 954 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 955 sumshort = ~(u_short)sum1; 956 *(sp) = htons(sumshort); 957} 958 959 960/* ------------------------------------------------------------------------ */ 961/* Function: ipf_fix_datacksum */ 962/* Returns: Nil */ 963/* Parameters: sp(I) - location of 16bit checksum to update */ 964/* n((I) - amount to adjust checksum by */ 965/* */ 966/* Fix_datacksum is used *only* for the adjustments of checksums in the */ 967/* data section of an IP packet. */ 968/* */ 969/* The only situation in which you need to do this is when NAT'ing an */ 970/* ICMP error message. Such a message, contains in its body the IP header */ 971/* of the original IP packet, that causes the error. */ 972/* */ 973/* You can't use fix_incksum or fix_outcksum in that case, because for the */ 974/* kernel the data section of the ICMP error is just data, and no special */ 975/* processing like hardware cksum or ntohs processing have been done by the */ 976/* kernel on the data section. */ 977/* ------------------------------------------------------------------------ */ 978void 979ipf_fix_datacksum(sp, n) 980 u_short *sp; 981 u_32_t n; 982{ 983 u_short sumshort; 984 u_32_t sum1; 985 986 if (n == 0) 987 return; 988 989 sum1 = (~ntohs(*sp)) & 0xffff; 990 sum1 += (n); 991 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 992 /* Again */ 993 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 994 sumshort = ~(u_short)sum1; 995 *(sp) = htons(sumshort); 996} 997 998 999/* ------------------------------------------------------------------------ */ 1000/* Function: ipf_nat_ioctl */ 1001/* Returns: int - 0 == success, != 0 == failure */ 1002/* Parameters: softc(I) - pointer to soft context main structure */ 1003/* data(I) - pointer to ioctl data */ 1004/* cmd(I) - ioctl command integer */ 1005/* mode(I) - file mode bits used with open */ 1006/* uid(I) - uid of calling process */ 1007/* ctx(I) - pointer used as key for finding context */ 1008/* */ 1009/* Processes an ioctl call made to operate on the IP Filter NAT device. */ 1010/* ------------------------------------------------------------------------ */ 1011int 1012ipf_nat_ioctl(softc, data, cmd, mode, uid, ctx) 1013 ipf_main_softc_t *softc; 1014 ioctlcmd_t cmd; 1015 caddr_t data; 1016 int mode, uid; 1017 void *ctx; 1018{ 1019 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1020 int error = 0, ret, arg, getlock; 1021 ipnat_t *nat, *nt, *n; 1022 ipnat_t natd; 1023 SPL_INT(s); 1024 1025#if BSD_GE_YEAR(199306) && defined(_KERNEL) 1026# if NETBSD_GE_REV(399002000) 1027 if ((mode & FWRITE) && 1028 kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL, 1029 KAUTH_REQ_NETWORK_FIREWALL_FW, 1030 NULL, NULL, NULL)) 1031# else 1032# if defined(__FreeBSD_version) && (__FreeBSD_version >= 500034) 1033 if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE)) 1034# else 1035 if ((securelevel >= 3) && (mode & FWRITE)) 1036# endif 1037# endif 1038 { 1039 IPFERROR(60001); 1040 return EPERM; 1041 } 1042#endif 1043 1044#if defined(__osf__) && defined(_KERNEL) 1045 getlock = 0; 1046#else 1047 getlock = (mode & NAT_LOCKHELD) ? 0 : 1; 1048#endif 1049 1050 n = NULL; 1051 nt = NULL; 1052 nat = NULL; 1053 1054 if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) || 1055 (cmd == (ioctlcmd_t)SIOCPURGENAT)) { 1056 if (mode & NAT_SYSSPACE) { 1057 bcopy(data, (char *)&natd, sizeof(natd)); 1058 nat = &natd; 1059 error = 0; 1060 } else { 1061 bzero(&natd, sizeof(natd)); 1062 error = ipf_inobj(softc, data, NULL, &natd, 1063 IPFOBJ_IPNAT); 1064 if (error != 0) 1065 goto done; 1066 1067 if (natd.in_size < sizeof(ipnat_t)) { 1068 error = EINVAL; 1069 goto done; 1070 } 1071 KMALLOCS(nt, ipnat_t *, natd.in_size); 1072 if (nt == NULL) { 1073 IPFERROR(60070); 1074 error = ENOMEM; 1075 goto done; 1076 } 1077 bzero(nt, natd.in_size); 1078 error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT, 1079 natd.in_size); 1080 if (error) 1081 goto done; 1082 nat = nt; 1083 } 1084 1085 /* 1086 * For add/delete, look to see if the NAT entry is 1087 * already present 1088 */ 1089 nat->in_flags &= IPN_USERFLAGS; 1090 if ((nat->in_redir & NAT_MAPBLK) == 0) { 1091 if (nat->in_osrcatype == FRI_NORMAL || 1092 nat->in_osrcatype == FRI_NONE) 1093 nat->in_osrcaddr &= nat->in_osrcmsk; 1094 if (nat->in_odstatype == FRI_NORMAL || 1095 nat->in_odstatype == FRI_NONE) 1096 nat->in_odstaddr &= nat->in_odstmsk; 1097 if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) { 1098 if (nat->in_nsrcatype == FRI_NORMAL) 1099 nat->in_nsrcaddr &= nat->in_nsrcmsk; 1100 if (nat->in_ndstatype == FRI_NORMAL) 1101 nat->in_ndstaddr &= nat->in_ndstmsk; 1102 } 1103 } 1104 1105 error = ipf_nat_rule_init(softc, softn, nat); 1106 if (error != 0) 1107 goto done; 1108 1109 MUTEX_ENTER(&softn->ipf_nat_io); 1110 for (n = softn->ipf_nat_list; n != NULL; n = n->in_next) 1111 if (ipf_nat_cmp_rules(nat, n) == 0) 1112 break; 1113 } 1114 1115 switch (cmd) 1116 { 1117#ifdef IPFILTER_LOG 1118 case SIOCIPFFB : 1119 { 1120 int tmp; 1121 1122 if (!(mode & FWRITE)) { 1123 IPFERROR(60002); 1124 error = EPERM; 1125 } else { 1126 tmp = ipf_log_clear(softc, IPL_LOGNAT); 1127 error = BCOPYOUT(&tmp, data, sizeof(tmp)); 1128 if (error != 0) { 1129 IPFERROR(60057); 1130 error = EFAULT; 1131 } 1132 } 1133 break; 1134 } 1135 1136 case SIOCSETLG : 1137 if (!(mode & FWRITE)) { 1138 IPFERROR(60003); 1139 error = EPERM; 1140 } else { 1141 error = BCOPYIN(data, &softn->ipf_nat_logging, 1142 sizeof(softn->ipf_nat_logging)); 1143 if (error != 0) 1144 error = EFAULT; 1145 } 1146 break; 1147 1148 case SIOCGETLG : 1149 error = BCOPYOUT(&softn->ipf_nat_logging, data, 1150 sizeof(softn->ipf_nat_logging)); 1151 if (error != 0) { 1152 IPFERROR(60004); 1153 error = EFAULT; 1154 } 1155 break; 1156 1157 case FIONREAD : 1158 arg = ipf_log_bytesused(softc, IPL_LOGNAT); 1159 error = BCOPYOUT(&arg, data, sizeof(arg)); 1160 if (error != 0) { 1161 IPFERROR(60005); 1162 error = EFAULT; 1163 } 1164 break; 1165#endif 1166 case SIOCADNAT : 1167 if (!(mode & FWRITE)) { 1168 IPFERROR(60006); 1169 error = EPERM; 1170 } else if (n != NULL) { 1171 natd.in_flineno = n->in_flineno; 1172 (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT); 1173 IPFERROR(60007); 1174 error = EEXIST; 1175 } else if (nt == NULL) { 1176 IPFERROR(60008); 1177 error = ENOMEM; 1178 } 1179 if (error != 0) { 1180 MUTEX_EXIT(&softn->ipf_nat_io); 1181 break; 1182 } 1183 if (nat != nt) 1184 bcopy((char *)nat, (char *)nt, sizeof(*n)); 1185 error = ipf_nat_siocaddnat(softc, softn, nt, getlock); 1186 MUTEX_EXIT(&softn->ipf_nat_io); 1187 if (error == 0) { 1188 nat = NULL; 1189 nt = NULL; 1190 } 1191 break; 1192 1193 case SIOCRMNAT : 1194 case SIOCPURGENAT : 1195 if (!(mode & FWRITE)) { 1196 IPFERROR(60009); 1197 error = EPERM; 1198 n = NULL; 1199 } else if (n == NULL) { 1200 IPFERROR(60010); 1201 error = ESRCH; 1202 } 1203 1204 if (error != 0) { 1205 MUTEX_EXIT(&softn->ipf_nat_io); 1206 break; 1207 } 1208 if (cmd == (ioctlcmd_t)SIOCPURGENAT) { 1209 error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT, 1210 n->in_size); 1211 if (error) { 1212 MUTEX_EXIT(&softn->ipf_nat_io); 1213 goto done; 1214 } 1215 n->in_flags |= IPN_PURGE; 1216 } 1217 ipf_nat_siocdelnat(softc, softn, n, getlock); 1218 1219 MUTEX_EXIT(&softn->ipf_nat_io); 1220 n = NULL; 1221 break; 1222 1223 case SIOCGNATS : 1224 { 1225 natstat_t *nsp = &softn->ipf_nat_stats; 1226 1227 nsp->ns_side[0].ns_table = softn->ipf_nat_table[0]; 1228 nsp->ns_side[1].ns_table = softn->ipf_nat_table[1]; 1229 nsp->ns_list = softn->ipf_nat_list; 1230 nsp->ns_maptable = softn->ipf_hm_maptable; 1231 nsp->ns_maplist = softn->ipf_hm_maplist; 1232 nsp->ns_nattab_sz = softn->ipf_nat_table_sz; 1233 nsp->ns_nattab_max = softn->ipf_nat_table_max; 1234 nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz; 1235 nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz; 1236 nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz; 1237 nsp->ns_instances = softn->ipf_nat_instances; 1238 nsp->ns_ticks = softc->ipf_ticks; 1239#ifdef IPFILTER_LOGGING 1240 nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT); 1241 nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT); 1242#else 1243 nsp->ns_log_ok = 0; 1244 nsp->ns_log_fail = 0; 1245#endif 1246 error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT); 1247 break; 1248 } 1249 1250 case SIOCGNATL : 1251 { 1252 natlookup_t nl; 1253 1254 error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP); 1255 if (error == 0) { 1256 void *ptr; 1257 1258 if (getlock) { 1259 READ_ENTER(&softc->ipf_nat); 1260 } 1261 1262 switch (nl.nl_v) 1263 { 1264 case 4 : 1265 ptr = ipf_nat_lookupredir(&nl); 1266 break; 1267#ifdef USE_INET6 1268 case 6 : 1269 ptr = ipf_nat6_lookupredir(&nl); 1270 break; 1271#endif 1272 default: 1273 ptr = NULL; 1274 break; 1275 } 1276 1277 if (getlock) { 1278 RWLOCK_EXIT(&softc->ipf_nat); 1279 } 1280 if (ptr != NULL) { 1281 error = ipf_outobj(softc, data, &nl, 1282 IPFOBJ_NATLOOKUP); 1283 } else { 1284 IPFERROR(60011); 1285 error = ESRCH; 1286 } 1287 } 1288 break; 1289 } 1290 1291 case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */ 1292 if (!(mode & FWRITE)) { 1293 IPFERROR(60012); 1294 error = EPERM; 1295 break; 1296 } 1297 if (getlock) { 1298 WRITE_ENTER(&softc->ipf_nat); 1299 } 1300 1301 error = BCOPYIN(data, &arg, sizeof(arg)); 1302 if (error != 0) { 1303 IPFERROR(60013); 1304 error = EFAULT; 1305 } else { 1306 if (arg == 0) 1307 ret = ipf_nat_flushtable(softc, softn); 1308 else if (arg == 1) 1309 ret = ipf_nat_clearlist(softc, softn); 1310 else 1311 ret = ipf_nat_extraflush(softc, softn, arg); 1312 ipf_proxy_flush(softc->ipf_proxy_soft, arg); 1313 } 1314 1315 if (getlock) { 1316 RWLOCK_EXIT(&softc->ipf_nat); 1317 } 1318 if (error == 0) { 1319 error = BCOPYOUT(&ret, data, sizeof(ret)); 1320 } 1321 break; 1322 1323 case SIOCMATCHFLUSH : 1324 if (!(mode & FWRITE)) { 1325 IPFERROR(60014); 1326 error = EPERM; 1327 break; 1328 } 1329 if (getlock) { 1330 WRITE_ENTER(&softc->ipf_nat); 1331 } 1332 1333 error = ipf_nat_matchflush(softc, softn, data); 1334 1335 if (getlock) { 1336 RWLOCK_EXIT(&softc->ipf_nat); 1337 } 1338 break; 1339 1340 case SIOCPROXY : 1341 error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx); 1342 break; 1343 1344 case SIOCSTLCK : 1345 if (!(mode & FWRITE)) { 1346 IPFERROR(60015); 1347 error = EPERM; 1348 } else { 1349 error = ipf_lock(data, &softn->ipf_nat_lock); 1350 } 1351 break; 1352 1353 case SIOCSTPUT : 1354 if ((mode & FWRITE) != 0) { 1355 error = ipf_nat_putent(softc, data, getlock); 1356 } else { 1357 IPFERROR(60016); 1358 error = EACCES; 1359 } 1360 break; 1361 1362 case SIOCSTGSZ : 1363 if (softn->ipf_nat_lock) { 1364 error = ipf_nat_getsz(softc, data, getlock); 1365 } else { 1366 IPFERROR(60017); 1367 error = EACCES; 1368 } 1369 break; 1370 1371 case SIOCSTGET : 1372 if (softn->ipf_nat_lock) { 1373 error = ipf_nat_getent(softc, data, getlock); 1374 } else { 1375 IPFERROR(60018); 1376 error = EACCES; 1377 } 1378 break; 1379 1380 case SIOCGENITER : 1381 { 1382 ipfgeniter_t iter; 1383 ipftoken_t *token; 1384 ipfobj_t obj; 1385 1386 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER); 1387 if (error != 0) 1388 break; 1389 1390 SPL_SCHED(s); 1391 token = ipf_token_find(softc, iter.igi_type, uid, ctx); 1392 if (token != NULL) { 1393 error = ipf_nat_iterator(softc, token, &iter, &obj); 1394 WRITE_ENTER(&softc->ipf_tokens); 1395 ipf_token_deref(softc, token); 1396 RWLOCK_EXIT(&softc->ipf_tokens); 1397 } 1398 SPL_X(s); 1399 break; 1400 } 1401 1402 case SIOCIPFDELTOK : 1403 error = BCOPYIN(data, &arg, sizeof(arg)); 1404 if (error == 0) { 1405 SPL_SCHED(s); 1406 error = ipf_token_del(softc, arg, uid, ctx); 1407 SPL_X(s); 1408 } else { 1409 IPFERROR(60019); 1410 error = EFAULT; 1411 } 1412 break; 1413 1414 case SIOCGTQTAB : 1415 error = ipf_outobj(softc, data, softn->ipf_nat_tcptq, 1416 IPFOBJ_STATETQTAB); 1417 break; 1418 1419 case SIOCGTABL : 1420 error = ipf_nat_gettable(softc, softn, data); 1421 break; 1422 1423 default : 1424 IPFERROR(60020); 1425 error = EINVAL; 1426 break; 1427 } 1428done: 1429 if (nat != NULL) 1430 ipf_nat_rule_fini(softc, nat); 1431 if (nt != NULL) 1432 KFREES(nt, nt->in_size); 1433 return error; 1434} 1435 1436 1437/* ------------------------------------------------------------------------ */ 1438/* Function: ipf_nat_siocaddnat */ 1439/* Returns: int - 0 == success, != 0 == failure */ 1440/* Parameters: softc(I) - pointer to soft context main structure */ 1441/* softn(I) - pointer to NAT context structure */ 1442/* n(I) - pointer to new NAT rule */ 1443/* np(I) - pointer to where to insert new NAT rule */ 1444/* getlock(I) - flag indicating if lock on is held */ 1445/* Mutex Locks: ipf_nat_io */ 1446/* */ 1447/* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1448/* from information passed to the kernel, then add it to the appropriate */ 1449/* NAT rule table(s). */ 1450/* ------------------------------------------------------------------------ */ 1451static int 1452ipf_nat_siocaddnat(softc, softn, n, getlock) 1453 ipf_main_softc_t *softc; 1454 ipf_nat_softc_t *softn; 1455 ipnat_t *n; 1456 int getlock; 1457{ 1458 int error = 0; 1459 1460 if (ipf_nat_resolverule(softc, n) != 0) { 1461 IPFERROR(60022); 1462 return ENOENT; 1463 } 1464 1465 if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) { 1466 IPFERROR(60023); 1467 return EINVAL; 1468 } 1469 1470 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 1471 /* 1472 * Prerecord whether or not the destination of the divert 1473 * is local or not to the interface the packet is going 1474 * to be sent out. 1475 */ 1476 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 1477 n->in_ifps[1], &n->in_ndstip6); 1478 } 1479 1480 if (getlock) { 1481 WRITE_ENTER(&softc->ipf_nat); 1482 } 1483 n->in_next = NULL; 1484 n->in_pnext = softn->ipf_nat_list_tail; 1485 *n->in_pnext = n; 1486 softn->ipf_nat_list_tail = &n->in_next; 1487 n->in_use++; 1488 1489 if (n->in_redir & NAT_REDIRECT) { 1490 n->in_flags &= ~IPN_NOTDST; 1491 switch (n->in_v[0]) 1492 { 1493 case 4 : 1494 ipf_nat_addrdr(softn, n); 1495 break; 1496#ifdef USE_INET6 1497 case 6 : 1498 ipf_nat6_addrdr(softn, n); 1499 break; 1500#endif 1501 default : 1502 break; 1503 } 1504 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr); 1505 } 1506 1507 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 1508 n->in_flags &= ~IPN_NOTSRC; 1509 switch (n->in_v[0]) 1510 { 1511 case 4 : 1512 ipf_nat_addmap(softn, n); 1513 break; 1514#ifdef USE_INET6 1515 case 6 : 1516 ipf_nat6_addmap(softn, n); 1517 break; 1518#endif 1519 default : 1520 break; 1521 } 1522 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map); 1523 } 1524 1525 if (n->in_age[0] != 0) 1526 n->in_tqehead[0] = ipf_addtimeoutqueue(softc, 1527 &softn->ipf_nat_utqe, 1528 n->in_age[0]); 1529 1530 if (n->in_age[1] != 0) 1531 n->in_tqehead[1] = ipf_addtimeoutqueue(softc, 1532 &softn->ipf_nat_utqe, 1533 n->in_age[1]); 1534 1535 MUTEX_INIT(&n->in_lock, "ipnat rule lock"); 1536 1537 n = NULL; 1538 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 1539#if SOLARIS && !defined(INSTANCES) 1540 pfil_delayed_copy = 0; 1541#endif 1542 if (getlock) { 1543 RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */ 1544 } 1545 1546 return error; 1547} 1548 1549 1550/* ------------------------------------------------------------------------ */ 1551/* Function: ipf_nat_ruleaddrinit */ 1552/* Parameters: softc(I) - pointer to soft context main structure */ 1553/* softn(I) - pointer to NAT context structure */ 1554/* n(I) - pointer to NAT rule */ 1555/* */ 1556/* Initialise all of the NAT address structures in a NAT rule. */ 1557/* ------------------------------------------------------------------------ */ 1558static int 1559ipf_nat_ruleaddrinit(softc, softn, n) 1560 ipf_main_softc_t *softc; 1561 ipf_nat_softc_t *softn; 1562 ipnat_t *n; 1563{ 1564 int idx, error; 1565 1566 if ((n->in_ndst.na_atype == FRI_LOOKUP) && 1567 (n->in_ndst.na_type != IPLT_DSTLIST)) { 1568 IPFERROR(60071); 1569 return EINVAL; 1570 } 1571 if ((n->in_nsrc.na_atype == FRI_LOOKUP) && 1572 (n->in_nsrc.na_type != IPLT_DSTLIST)) { 1573 IPFERROR(60069); 1574 return EINVAL; 1575 } 1576 1577 if (n->in_redir == NAT_BIMAP) { 1578 n->in_ndstaddr = n->in_osrcaddr; 1579 n->in_ndstmsk = n->in_osrcmsk; 1580 n->in_odstaddr = n->in_nsrcaddr; 1581 n->in_odstmsk = n->in_nsrcmsk; 1582 1583 } 1584 1585 if (n->in_redir & NAT_REDIRECT) 1586 idx = 1; 1587 else 1588 idx = 0; 1589 /* 1590 * Initialise all of the address fields. 1591 */ 1592 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1, 1593 n->in_ifps[idx]); 1594 if (error != 0) 1595 return error; 1596 1597 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1, 1598 n->in_ifps[idx]); 1599 if (error != 0) 1600 return error; 1601 1602 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1, 1603 n->in_ifps[idx]); 1604 if (error != 0) 1605 return error; 1606 1607 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1, 1608 n->in_ifps[idx]); 1609 if (error != 0) 1610 return error; 1611 1612 if (n->in_redir & NAT_DIVERTUDP) 1613 ipf_nat_builddivertmp(softn, n); 1614 1615 return 0; 1616} 1617 1618 1619/* ------------------------------------------------------------------------ */ 1620/* Function: ipf_nat_resolvrule */ 1621/* Returns: Nil */ 1622/* Parameters: softc(I) - pointer to soft context main structure */ 1623/* n(I) - pointer to NAT rule */ 1624/* */ 1625/* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1626/* from information passed to the kernel, then add it to the appropriate */ 1627/* NAT rule table(s). */ 1628/* ------------------------------------------------------------------------ */ 1629static int 1630ipf_nat_resolverule(softc, n) 1631 ipf_main_softc_t *softc; 1632 ipnat_t *n; 1633{ 1634 char *base; 1635 1636 base = n->in_names; 1637 1638 n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0], 1639 n->in_v[0]); 1640 1641 if (n->in_ifnames[1] == -1) { 1642 n->in_ifnames[1] = n->in_ifnames[0]; 1643 n->in_ifps[1] = n->in_ifps[0]; 1644 } else { 1645 n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1], 1646 n->in_v[1]); 1647 } 1648 1649 if (n->in_plabel != -1) { 1650 if (n->in_redir & NAT_REDIRECT) 1651 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1652 n->in_pr[0], 1653 base + n->in_plabel); 1654 else 1655 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1656 n->in_pr[1], 1657 base + n->in_plabel); 1658 if (n->in_apr == NULL) 1659 return -1; 1660 } 1661 return 0; 1662} 1663 1664 1665/* ------------------------------------------------------------------------ */ 1666/* Function: ipf_nat_siocdelnat */ 1667/* Returns: int - 0 == success, != 0 == failure */ 1668/* Parameters: softc(I) - pointer to soft context main structure */ 1669/* softn(I) - pointer to NAT context structure */ 1670/* n(I) - pointer to new NAT rule */ 1671/* getlock(I) - flag indicating if lock on is held */ 1672/* Mutex Locks: ipf_nat_io */ 1673/* */ 1674/* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1675/* from information passed to the kernel, then add it to the appropriate */ 1676/* NAT rule table(s). */ 1677/* ------------------------------------------------------------------------ */ 1678static void 1679ipf_nat_siocdelnat(softc, softn, n, getlock) 1680 ipf_main_softc_t *softc; 1681 ipf_nat_softc_t *softn; 1682 ipnat_t *n; 1683 int getlock; 1684{ 1685 if (getlock) { 1686 WRITE_ENTER(&softc->ipf_nat); 1687 } 1688 1689 ipf_nat_delrule(softc, softn, n, 1); 1690 1691 if (getlock) { 1692 RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */ 1693 } 1694} 1695 1696 1697/* ------------------------------------------------------------------------ */ 1698/* Function: ipf_nat_getsz */ 1699/* Returns: int - 0 == success, != 0 is the error value. */ 1700/* Parameters: softc(I) - pointer to soft context main structure */ 1701/* data(I) - pointer to natget structure with kernel */ 1702/* pointer get the size of. */ 1703/* getlock(I) - flag indicating whether or not the caller */ 1704/* holds a lock on ipf_nat */ 1705/* */ 1706/* Handle SIOCSTGSZ. */ 1707/* Return the size of the nat list entry to be copied back to user space. */ 1708/* The size of the entry is stored in the ng_sz field and the enture natget */ 1709/* structure is copied back to the user. */ 1710/* ------------------------------------------------------------------------ */ 1711static int 1712ipf_nat_getsz(softc, data, getlock) 1713 ipf_main_softc_t *softc; 1714 caddr_t data; 1715 int getlock; 1716{ 1717 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1718 ap_session_t *aps; 1719 nat_t *nat, *n; 1720 natget_t ng; 1721 int error; 1722 1723 error = BCOPYIN(data, &ng, sizeof(ng)); 1724 if (error != 0) { 1725 IPFERROR(60024); 1726 return EFAULT; 1727 } 1728 1729 if (getlock) { 1730 READ_ENTER(&softc->ipf_nat); 1731 } 1732 1733 nat = ng.ng_ptr; 1734 if (!nat) { 1735 nat = softn->ipf_nat_instances; 1736 ng.ng_sz = 0; 1737 /* 1738 * Empty list so the size returned is 0. Simple. 1739 */ 1740 if (nat == NULL) { 1741 if (getlock) { 1742 RWLOCK_EXIT(&softc->ipf_nat); 1743 } 1744 error = BCOPYOUT(&ng, data, sizeof(ng)); 1745 if (error != 0) { 1746 IPFERROR(60025); 1747 return EFAULT; 1748 } 1749 return 0; 1750 } 1751 } else { 1752 /* 1753 * Make sure the pointer we're copying from exists in the 1754 * current list of entries. Security precaution to prevent 1755 * copying of random kernel data. 1756 */ 1757 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1758 if (n == nat) 1759 break; 1760 if (n == NULL) { 1761 if (getlock) { 1762 RWLOCK_EXIT(&softc->ipf_nat); 1763 } 1764 IPFERROR(60026); 1765 return ESRCH; 1766 } 1767 } 1768 1769 /* 1770 * Incluse any space required for proxy data structures. 1771 */ 1772 ng.ng_sz = sizeof(nat_save_t); 1773 aps = nat->nat_aps; 1774 if (aps != NULL) { 1775 ng.ng_sz += sizeof(ap_session_t) - 4; 1776 if (aps->aps_data != 0) 1777 ng.ng_sz += aps->aps_psiz; 1778 } 1779 if (getlock) { 1780 RWLOCK_EXIT(&softc->ipf_nat); 1781 } 1782 1783 error = BCOPYOUT(&ng, data, sizeof(ng)); 1784 if (error != 0) { 1785 IPFERROR(60027); 1786 return EFAULT; 1787 } 1788 return 0; 1789} 1790 1791 1792/* ------------------------------------------------------------------------ */ 1793/* Function: ipf_nat_getent */ 1794/* Returns: int - 0 == success, != 0 is the error value. */ 1795/* Parameters: softc(I) - pointer to soft context main structure */ 1796/* data(I) - pointer to natget structure with kernel pointer*/ 1797/* to NAT structure to copy out. */ 1798/* getlock(I) - flag indicating whether or not the caller */ 1799/* holds a lock on ipf_nat */ 1800/* */ 1801/* Handle SIOCSTGET. */ 1802/* Copies out NAT entry to user space. Any additional data held for a */ 1803/* proxy is also copied, as to is the NAT rule which was responsible for it */ 1804/* ------------------------------------------------------------------------ */ 1805static int 1806ipf_nat_getent(softc, data, getlock) 1807 ipf_main_softc_t *softc; 1808 caddr_t data; 1809 int getlock; 1810{ 1811 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1812 int error, outsize; 1813 ap_session_t *aps; 1814 nat_save_t *ipn, ipns; 1815 nat_t *n, *nat; 1816 1817 error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE); 1818 if (error != 0) 1819 return error; 1820 1821 if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) { 1822 IPFERROR(60028); 1823 return EINVAL; 1824 } 1825 1826 KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize); 1827 if (ipn == NULL) { 1828 IPFERROR(60029); 1829 return ENOMEM; 1830 } 1831 1832 if (getlock) { 1833 READ_ENTER(&softc->ipf_nat); 1834 } 1835 1836 ipn->ipn_dsize = ipns.ipn_dsize; 1837 nat = ipns.ipn_next; 1838 if (nat == NULL) { 1839 nat = softn->ipf_nat_instances; 1840 if (nat == NULL) { 1841 if (softn->ipf_nat_instances == NULL) { 1842 IPFERROR(60030); 1843 error = ENOENT; 1844 } 1845 goto finished; 1846 } 1847 } else { 1848 /* 1849 * Make sure the pointer we're copying from exists in the 1850 * current list of entries. Security precaution to prevent 1851 * copying of random kernel data. 1852 */ 1853 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1854 if (n == nat) 1855 break; 1856 if (n == NULL) { 1857 IPFERROR(60031); 1858 error = ESRCH; 1859 goto finished; 1860 } 1861 } 1862 ipn->ipn_next = nat->nat_next; 1863 1864 /* 1865 * Copy the NAT structure. 1866 */ 1867 bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat)); 1868 1869 /* 1870 * If we have a pointer to the NAT rule it belongs to, save that too. 1871 */ 1872 if (nat->nat_ptr != NULL) 1873 bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat, 1874 ipn->ipn_ipnat.in_size); 1875 1876 /* 1877 * If we also know the NAT entry has an associated filter rule, 1878 * save that too. 1879 */ 1880 if (nat->nat_fr != NULL) 1881 bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr, 1882 sizeof(ipn->ipn_fr)); 1883 1884 /* 1885 * Last but not least, if there is an application proxy session set 1886 * up for this NAT entry, then copy that out too, including any 1887 * private data saved along side it by the proxy. 1888 */ 1889 aps = nat->nat_aps; 1890 outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data); 1891 if (aps != NULL) { 1892 char *s; 1893 1894 if (outsize < sizeof(*aps)) { 1895 IPFERROR(60032); 1896 error = ENOBUFS; 1897 goto finished; 1898 } 1899 1900 s = ipn->ipn_data; 1901 bcopy((char *)aps, s, sizeof(*aps)); 1902 s += sizeof(*aps); 1903 outsize -= sizeof(*aps); 1904 if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz)) 1905 bcopy(aps->aps_data, s, aps->aps_psiz); 1906 else { 1907 IPFERROR(60033); 1908 error = ENOBUFS; 1909 } 1910 } 1911 if (error == 0) { 1912 if (getlock) { 1913 READ_ENTER(&softc->ipf_nat); 1914 getlock = 0; 1915 } 1916 error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE, 1917 ipns.ipn_dsize); 1918 } 1919 1920finished: 1921 if (getlock) { 1922 READ_ENTER(&softc->ipf_nat); 1923 } 1924 if (ipn != NULL) { 1925 KFREES(ipn, ipns.ipn_dsize); 1926 } 1927 return error; 1928} 1929 1930 1931/* ------------------------------------------------------------------------ */ 1932/* Function: ipf_nat_putent */ 1933/* Returns: int - 0 == success, != 0 is the error value. */ 1934/* Parameters: softc(I) - pointer to soft context main structure */ 1935/* data(I) - pointer to natget structure with NAT */ 1936/* structure information to load into the kernel */ 1937/* getlock(I) - flag indicating whether or not a write lock */ 1938/* on is already held. */ 1939/* */ 1940/* Handle SIOCSTPUT. */ 1941/* Loads a NAT table entry from user space, including a NAT rule, proxy and */ 1942/* firewall rule data structures, if pointers to them indicate so. */ 1943/* ------------------------------------------------------------------------ */ 1944static int 1945ipf_nat_putent(softc, data, getlock) 1946 ipf_main_softc_t *softc; 1947 caddr_t data; 1948 int getlock; 1949{ 1950 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1951 nat_save_t ipn, *ipnn; 1952 ap_session_t *aps; 1953 nat_t *n, *nat; 1954 frentry_t *fr; 1955 fr_info_t fin; 1956 ipnat_t *in; 1957 int error; 1958 1959 error = ipf_inobj(softc, data, NULL, &ipn, IPFOBJ_NATSAVE); 1960 if (error != 0) 1961 return error; 1962 1963 /* 1964 * Initialise early because of code at junkput label. 1965 */ 1966 n = NULL; 1967 in = NULL; 1968 aps = NULL; 1969 nat = NULL; 1970 ipnn = NULL; 1971 fr = NULL; 1972 1973 /* 1974 * New entry, copy in the rest of the NAT entry if it's size is more 1975 * than just the nat_t structure. 1976 */ 1977 if (ipn.ipn_dsize > sizeof(ipn)) { 1978 if (ipn.ipn_dsize > 81920) { 1979 IPFERROR(60034); 1980 error = ENOMEM; 1981 goto junkput; 1982 } 1983 1984 KMALLOCS(ipnn, nat_save_t *, ipn.ipn_dsize); 1985 if (ipnn == NULL) { 1986 IPFERROR(60035); 1987 return ENOMEM; 1988 } 1989 1990 bzero(ipnn, ipn.ipn_dsize); 1991 error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE, 1992 ipn.ipn_dsize); 1993 if (error != 0) { 1994 goto junkput; 1995 } 1996 } else 1997 ipnn = &ipn; 1998 1999 KMALLOC(nat, nat_t *); 2000 if (nat == NULL) { 2001 IPFERROR(60037); 2002 error = ENOMEM; 2003 goto junkput; 2004 } 2005 2006 bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat)); 2007 2008 switch (nat->nat_v[0]) 2009 { 2010 case 4: 2011#ifdef USE_INET6 2012 case 6 : 2013#endif 2014 break; 2015 default : 2016 IPFERROR(60061); 2017 error = EPROTONOSUPPORT; 2018 goto junkput; 2019 /*NOTREACHED*/ 2020 } 2021 2022 /* 2023 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 2024 */ 2025 bzero((char *)nat, offsetof(struct nat, nat_tqe)); 2026 nat->nat_tqe.tqe_pnext = NULL; 2027 nat->nat_tqe.tqe_next = NULL; 2028 nat->nat_tqe.tqe_ifq = NULL; 2029 nat->nat_tqe.tqe_parent = nat; 2030 2031 /* 2032 * Restore the rule associated with this nat session 2033 */ 2034 in = ipnn->ipn_nat.nat_ptr; 2035 if (in != NULL) { 2036 KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size); 2037 nat->nat_ptr = in; 2038 if (in == NULL) { 2039 IPFERROR(60038); 2040 error = ENOMEM; 2041 goto junkput; 2042 } 2043 bcopy((char *)&ipnn->ipn_ipnat, (char *)in, 2044 ipnn->ipn_ipnat.in_size); 2045 in->in_use = 1; 2046 in->in_flags |= IPN_DELETE; 2047 2048 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 2049 2050 if (ipf_nat_resolverule(softc, in) != 0) { 2051 IPFERROR(60039); 2052 error = ESRCH; 2053 goto junkput; 2054 } 2055 } 2056 2057 /* 2058 * Check that the NAT entry doesn't already exist in the kernel. 2059 * 2060 * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do 2061 * this, we check to see if the inbound combination of addresses and 2062 * ports is already known. Similar logic is applied for NAT_INBOUND. 2063 * 2064 */ 2065 bzero((char *)&fin, sizeof(fin)); 2066 fin.fin_v = nat->nat_v[0]; 2067 fin.fin_p = nat->nat_pr[0]; 2068 fin.fin_rev = nat->nat_rev; 2069 fin.fin_ifp = nat->nat_ifps[0]; 2070 fin.fin_data[0] = ntohs(nat->nat_ndport); 2071 fin.fin_data[1] = ntohs(nat->nat_nsport); 2072 2073 switch (nat->nat_dir) 2074 { 2075 case NAT_OUTBOUND : 2076 case NAT_DIVERTOUT : 2077 if (getlock) { 2078 READ_ENTER(&softc->ipf_nat); 2079 } 2080 2081 fin.fin_v = nat->nat_v[1]; 2082 if (nat->nat_v[1] == 4) { 2083 n = ipf_nat_inlookup(&fin, nat->nat_flags, fin.fin_p, 2084 nat->nat_ndstip, nat->nat_nsrcip); 2085#ifdef USE_INET6 2086 } else if (nat->nat_v[1] == 6) { 2087 n = ipf_nat6_inlookup(&fin, nat->nat_flags, fin.fin_p, 2088 &nat->nat_ndst6.in6, 2089 &nat->nat_nsrc6.in6); 2090#endif 2091 } 2092 2093 if (getlock) { 2094 RWLOCK_EXIT(&softc->ipf_nat); 2095 } 2096 if (n != NULL) { 2097 IPFERROR(60040); 2098 error = EEXIST; 2099 goto junkput; 2100 } 2101 break; 2102 2103 case NAT_INBOUND : 2104 case NAT_DIVERTIN : 2105 if (getlock) { 2106 READ_ENTER(&softc->ipf_nat); 2107 } 2108 2109 if (fin.fin_v == 4) { 2110 n = ipf_nat_outlookup(&fin, nat->nat_flags, fin.fin_p, 2111 nat->nat_ndstip, 2112 nat->nat_nsrcip); 2113#ifdef USE_INET6 2114 } else if (fin.fin_v == 6) { 2115 n = ipf_nat6_outlookup(&fin, nat->nat_flags, fin.fin_p, 2116 &nat->nat_ndst6.in6, 2117 &nat->nat_nsrc6.in6); 2118#endif 2119 } 2120 2121 if (getlock) { 2122 RWLOCK_EXIT(&softc->ipf_nat); 2123 } 2124 if (n != NULL) { 2125 IPFERROR(60041); 2126 error = EEXIST; 2127 goto junkput; 2128 } 2129 break; 2130 2131 default : 2132 IPFERROR(60042); 2133 error = EINVAL; 2134 goto junkput; 2135 } 2136 2137 /* 2138 * Restore ap_session_t structure. Include the private data allocated 2139 * if it was there. 2140 */ 2141 aps = nat->nat_aps; 2142 if (aps != NULL) { 2143 KMALLOC(aps, ap_session_t *); 2144 nat->nat_aps = aps; 2145 if (aps == NULL) { 2146 IPFERROR(60043); 2147 error = ENOMEM; 2148 goto junkput; 2149 } 2150 bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps)); 2151 if (in != NULL) 2152 aps->aps_apr = in->in_apr; 2153 else 2154 aps->aps_apr = NULL; 2155 if (aps->aps_psiz != 0) { 2156 if (aps->aps_psiz > 81920) { 2157 IPFERROR(60044); 2158 error = ENOMEM; 2159 goto junkput; 2160 } 2161 KMALLOCS(aps->aps_data, void *, aps->aps_psiz); 2162 if (aps->aps_data == NULL) { 2163 IPFERROR(60045); 2164 error = ENOMEM; 2165 goto junkput; 2166 } 2167 bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data, 2168 aps->aps_psiz); 2169 } else { 2170 aps->aps_psiz = 0; 2171 aps->aps_data = NULL; 2172 } 2173 } 2174 2175 /* 2176 * If there was a filtering rule associated with this entry then 2177 * build up a new one. 2178 */ 2179 fr = nat->nat_fr; 2180 if (fr != NULL) { 2181 if ((nat->nat_flags & SI_NEWFR) != 0) { 2182 KMALLOC(fr, frentry_t *); 2183 nat->nat_fr = fr; 2184 if (fr == NULL) { 2185 IPFERROR(60046); 2186 error = ENOMEM; 2187 goto junkput; 2188 } 2189 ipnn->ipn_nat.nat_fr = fr; 2190 fr->fr_ref = 1; 2191 (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE); 2192 bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr)); 2193 2194 fr->fr_ref = 1; 2195 fr->fr_dsize = 0; 2196 fr->fr_data = NULL; 2197 fr->fr_type = FR_T_NONE; 2198 2199 MUTEX_NUKE(&fr->fr_lock); 2200 MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock"); 2201 } else { 2202 if (getlock) { 2203 READ_ENTER(&softc->ipf_nat); 2204 } 2205 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 2206 if (n->nat_fr == fr) 2207 break; 2208 2209 if (n != NULL) { 2210 MUTEX_ENTER(&fr->fr_lock); 2211 fr->fr_ref++; 2212 MUTEX_EXIT(&fr->fr_lock); 2213 } 2214 if (getlock) { 2215 RWLOCK_EXIT(&softc->ipf_nat); 2216 } 2217 2218 if (n == NULL) { 2219 IPFERROR(60047); 2220 error = ESRCH; 2221 goto junkput; 2222 } 2223 } 2224 } 2225 2226 if (ipnn != &ipn) { 2227 KFREES(ipnn, ipn.ipn_dsize); 2228 ipnn = NULL; 2229 } 2230 2231 if (getlock) { 2232 WRITE_ENTER(&softc->ipf_nat); 2233 } 2234 2235 if (fin.fin_v == 4) 2236 error = ipf_nat_finalise(&fin, nat); 2237#ifdef USE_INET6 2238 else 2239 error = ipf_nat6_finalise(&fin, nat); 2240#endif 2241 2242 if (getlock) { 2243 RWLOCK_EXIT(&softc->ipf_nat); 2244 } 2245 2246 if (error == 0) 2247 return 0; 2248 2249 IPFERROR(60048); 2250 error = ENOMEM; 2251 2252junkput: 2253 if (fr != NULL) { 2254 (void) ipf_derefrule(softc, &fr); 2255 } 2256 2257 if ((ipnn != NULL) && (ipnn != &ipn)) { 2258 KFREES(ipnn, ipn.ipn_dsize); 2259 } 2260 if (nat != NULL) { 2261 if (aps != NULL) { 2262 if (aps->aps_data != NULL) { 2263 KFREES(aps->aps_data, aps->aps_psiz); 2264 } 2265 KFREE(aps); 2266 } 2267 if (in != NULL) { 2268 if (in->in_apr) 2269 ipf_proxy_deref(in->in_apr); 2270 KFREES(in, in->in_size); 2271 } 2272 KFREE(nat); 2273 } 2274 return error; 2275} 2276 2277 2278/* ------------------------------------------------------------------------ */ 2279/* Function: ipf_nat_delete */ 2280/* Returns: Nil */ 2281/* Parameters: softc(I) - pointer to soft context main structure */ 2282/* nat(I) - pointer to NAT structure to delete */ 2283/* logtype(I) - type of LOG record to create before deleting */ 2284/* Write Lock: ipf_nat */ 2285/* */ 2286/* Delete a nat entry from the various lists and table. If NAT logging is */ 2287/* enabled then generate a NAT log record for this event. */ 2288/* ------------------------------------------------------------------------ */ 2289void 2290ipf_nat_delete(softc, nat, logtype) 2291 ipf_main_softc_t *softc; 2292 struct nat *nat; 2293 int logtype; 2294{ 2295 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2296 int madeorphan = 0, bkt, removed = 0; 2297 nat_stat_side_t *nss; 2298 struct ipnat *ipn; 2299 2300 if (logtype != 0 && softn->ipf_nat_logging != 0) 2301 ipf_nat_log(softc, softn, nat, logtype); 2302 2303 /* 2304 * Take it as a general indication that all the pointers are set if 2305 * nat_pnext is set. 2306 */ 2307 if (nat->nat_pnext != NULL) { 2308 removed = 1; 2309 2310 bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz; 2311 nss = &softn->ipf_nat_stats.ns_side[0]; 2312 nss->ns_bucketlen[bkt]--; 2313 if (nss->ns_bucketlen[bkt] == 0) { 2314 nss->ns_inuse--; 2315 } 2316 2317 bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz; 2318 nss = &softn->ipf_nat_stats.ns_side[1]; 2319 nss->ns_bucketlen[bkt]--; 2320 if (nss->ns_bucketlen[bkt] == 0) { 2321 nss->ns_inuse--; 2322 } 2323 2324 *nat->nat_pnext = nat->nat_next; 2325 if (nat->nat_next != NULL) { 2326 nat->nat_next->nat_pnext = nat->nat_pnext; 2327 nat->nat_next = NULL; 2328 } 2329 nat->nat_pnext = NULL; 2330 2331 *nat->nat_phnext[0] = nat->nat_hnext[0]; 2332 if (nat->nat_hnext[0] != NULL) { 2333 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 2334 nat->nat_hnext[0] = NULL; 2335 } 2336 nat->nat_phnext[0] = NULL; 2337 2338 *nat->nat_phnext[1] = nat->nat_hnext[1]; 2339 if (nat->nat_hnext[1] != NULL) { 2340 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 2341 nat->nat_hnext[1] = NULL; 2342 } 2343 nat->nat_phnext[1] = NULL; 2344 2345 if ((nat->nat_flags & SI_WILDP) != 0) { 2346 ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds); 2347 } 2348 madeorphan = 1; 2349 } 2350 2351 if (nat->nat_me != NULL) { 2352 *nat->nat_me = NULL; 2353 nat->nat_me = NULL; 2354 nat->nat_ref--; 2355 ASSERT(nat->nat_ref >= 0); 2356 } 2357 2358 if (nat->nat_tqe.tqe_ifq != NULL) { 2359 /* 2360 * No call to ipf_freetimeoutqueue() is made here, they are 2361 * garbage collected in ipf_nat_expire(). 2362 */ 2363 (void) ipf_deletequeueentry(&nat->nat_tqe); 2364 } 2365 2366 if (nat->nat_sync) { 2367 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 2368 nat->nat_sync = NULL; 2369 } 2370 2371 if (logtype == NL_EXPIRE) 2372 softn->ipf_nat_stats.ns_expire++; 2373 2374 MUTEX_ENTER(&nat->nat_lock); 2375 /* 2376 * NL_DESTROY should only be passed in when we've got nat_ref >= 2. 2377 * This happens when a nat'd packet is blocked and we want to throw 2378 * away the NAT session. 2379 */ 2380 if (logtype == NL_DESTROY) { 2381 if (nat->nat_ref > 2) { 2382 nat->nat_ref -= 2; 2383 MUTEX_EXIT(&nat->nat_lock); 2384 if (removed) 2385 softn->ipf_nat_stats.ns_orphans++; 2386 return; 2387 } 2388 } else if (nat->nat_ref > 1) { 2389 nat->nat_ref--; 2390 MUTEX_EXIT(&nat->nat_lock); 2391 if (madeorphan == 1) 2392 softn->ipf_nat_stats.ns_orphans++; 2393 return; 2394 } 2395 ASSERT(nat->nat_ref >= 0); 2396 MUTEX_EXIT(&nat->nat_lock); 2397 2398 nat->nat_ref = 0; 2399 2400 if (madeorphan == 0) 2401 softn->ipf_nat_stats.ns_orphans--; 2402 2403 /* 2404 * At this point, nat_ref can be either 0 or -1 2405 */ 2406 softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--; 2407 2408 if (nat->nat_fr != NULL) { 2409 (void) ipf_derefrule(softc, &nat->nat_fr); 2410 } 2411 2412 if (nat->nat_hm != NULL) { 2413 ipf_nat_hostmapdel(softc, &nat->nat_hm); 2414 } 2415 2416 /* 2417 * If there is an active reference from the nat entry to its parent 2418 * rule, decrement the rule's reference count and free it too if no 2419 * longer being used. 2420 */ 2421 ipn = nat->nat_ptr; 2422 nat->nat_ptr = NULL; 2423 2424 if (ipn != NULL) { 2425 ipn->in_space++; 2426 ipf_nat_rule_deref(softc, &ipn); 2427 } 2428 2429 if (nat->nat_aps != NULL) { 2430 ipf_proxy_free(softc, nat->nat_aps); 2431 nat->nat_aps = NULL; 2432 } 2433 2434 MUTEX_DESTROY(&nat->nat_lock); 2435 2436 softn->ipf_nat_stats.ns_active--; 2437 2438 /* 2439 * If there's a fragment table entry too for this nat entry, then 2440 * dereference that as well. This is after nat_lock is released 2441 * because of Tru64. 2442 */ 2443 ipf_frag_natforget(softc, (void *)nat); 2444 2445 KFREE(nat); 2446} 2447 2448 2449/* ------------------------------------------------------------------------ */ 2450/* Function: ipf_nat_flushtable */ 2451/* Returns: int - number of NAT rules deleted */ 2452/* Parameters: softc(I) - pointer to soft context main structure */ 2453/* softn(I) - pointer to NAT context structure */ 2454/* Write Lock: ipf_nat */ 2455/* */ 2456/* Deletes all currently active NAT sessions. In deleting each NAT entry a */ 2457/* log record should be emitted in ipf_nat_delete() if NAT logging is */ 2458/* enabled. */ 2459/* ------------------------------------------------------------------------ */ 2460/* 2461 * nat_flushtable - clear the NAT table of all mapping entries. 2462 */ 2463static int 2464ipf_nat_flushtable(softc, softn) 2465 ipf_main_softc_t *softc; 2466 ipf_nat_softc_t *softn; 2467{ 2468 nat_t *nat; 2469 int j = 0; 2470 2471 /* 2472 * ALL NAT mappings deleted, so lets just make the deletions 2473 * quicker. 2474 */ 2475 if (softn->ipf_nat_table[0] != NULL) 2476 bzero((char *)softn->ipf_nat_table[0], 2477 sizeof(softn->ipf_nat_table[0]) * 2478 softn->ipf_nat_table_sz); 2479 if (softn->ipf_nat_table[1] != NULL) 2480 bzero((char *)softn->ipf_nat_table[1], 2481 sizeof(softn->ipf_nat_table[1]) * 2482 softn->ipf_nat_table_sz); 2483 2484 while ((nat = softn->ipf_nat_instances) != NULL) { 2485 ipf_nat_delete(softc, nat, NL_FLUSH); 2486 j++; 2487 } 2488 2489 return j; 2490} 2491 2492 2493/* ------------------------------------------------------------------------ */ 2494/* Function: ipf_nat_clearlist */ 2495/* Returns: int - number of NAT/RDR rules deleted */ 2496/* Parameters: softc(I) - pointer to soft context main structure */ 2497/* softn(I) - pointer to NAT context structure */ 2498/* */ 2499/* Delete all rules in the current list of rules. There is nothing elegant */ 2500/* about this cleanup: simply free all entries on the list of rules and */ 2501/* clear out the tables used for hashed NAT rule lookups. */ 2502/* ------------------------------------------------------------------------ */ 2503static int 2504ipf_nat_clearlist(softc, softn) 2505 ipf_main_softc_t *softc; 2506 ipf_nat_softc_t *softn; 2507{ 2508 ipnat_t *n; 2509 int i = 0; 2510 2511 if (softn->ipf_nat_map_rules != NULL) { 2512 bzero((char *)softn->ipf_nat_map_rules, 2513 sizeof(*softn->ipf_nat_map_rules) * 2514 softn->ipf_nat_maprules_sz); 2515 } 2516 if (softn->ipf_nat_rdr_rules != NULL) { 2517 bzero((char *)softn->ipf_nat_rdr_rules, 2518 sizeof(*softn->ipf_nat_rdr_rules) * 2519 softn->ipf_nat_rdrrules_sz); 2520 } 2521 2522 while ((n = softn->ipf_nat_list) != NULL) { 2523 ipf_nat_delrule(softc, softn, n, 0); 2524 i++; 2525 } 2526#if SOLARIS && !defined(INSTANCES) 2527 pfil_delayed_copy = 1; 2528#endif 2529 return i; 2530} 2531 2532 2533/* ------------------------------------------------------------------------ */ 2534/* Function: ipf_nat_delrule */ 2535/* Returns: Nil */ 2536/* Parameters: softc(I) - pointer to soft context main structure */ 2537/* softn(I) - pointer to NAT context structure */ 2538/* np(I) - pointer to NAT rule to delete */ 2539/* purge(I) - 1 == allow purge, 0 == prevent purge */ 2540/* Locks: WRITE(ipf_nat) */ 2541/* */ 2542/* Preventing "purge" from occuring is allowed because when all of the NAT */ 2543/* rules are being removed, allowing the "purge" to walk through the list */ 2544/* of NAT sessions, possibly multiple times, would be a large performance */ 2545/* hit, on the order of O(N^2). */ 2546/* ------------------------------------------------------------------------ */ 2547static void 2548ipf_nat_delrule(softc, softn, np, purge) 2549 ipf_main_softc_t *softc; 2550 ipf_nat_softc_t *softn; 2551 ipnat_t *np; 2552 int purge; 2553{ 2554 2555 if (np->in_pnext != NULL) { 2556 *np->in_pnext = np->in_next; 2557 if (np->in_next != NULL) 2558 np->in_next->in_pnext = np->in_pnext; 2559 if (softn->ipf_nat_list_tail == &np->in_next) 2560 softn->ipf_nat_list_tail = np->in_pnext; 2561 } 2562 2563 if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) { 2564 nat_t *next; 2565 nat_t *nat; 2566 2567 for (next = softn->ipf_nat_instances; (nat = next) != NULL;) { 2568 next = nat->nat_next; 2569 if (nat->nat_ptr == np) 2570 ipf_nat_delete(softc, nat, NL_PURGE); 2571 } 2572 } 2573 2574 if ((np->in_flags & IPN_DELETE) == 0) { 2575 if (np->in_redir & NAT_REDIRECT) { 2576 switch (np->in_v[0]) 2577 { 2578 case 4 : 2579 ipf_nat_delrdr(softn, np); 2580 break; 2581#ifdef USE_INET6 2582 case 6 : 2583 ipf_nat6_delrdr(softn, np); 2584 break; 2585#endif 2586 } 2587 } 2588 if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) { 2589 switch (np->in_v[0]) 2590 { 2591 case 4 : 2592 ipf_nat_delmap(softn, np); 2593 break; 2594#ifdef USE_INET6 2595 case 6 : 2596 ipf_nat6_delmap(softn, np); 2597 break; 2598#endif 2599 } 2600 } 2601 } 2602 2603 np->in_flags |= IPN_DELETE; 2604 ipf_nat_rule_deref(softc, &np); 2605} 2606 2607 2608/* ------------------------------------------------------------------------ */ 2609/* Function: ipf_nat_newmap */ 2610/* Returns: int - -1 == error, 0 == success */ 2611/* Parameters: fin(I) - pointer to packet information */ 2612/* nat(I) - pointer to NAT entry */ 2613/* ni(I) - pointer to structure with misc. information needed */ 2614/* to create new NAT entry. */ 2615/* */ 2616/* Given an empty NAT structure, populate it with new information about a */ 2617/* new NAT session, as defined by the matching NAT rule. */ 2618/* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2619/* to the new IP address for the translation. */ 2620/* ------------------------------------------------------------------------ */ 2621static int 2622ipf_nat_newmap(fin, nat, ni) 2623 fr_info_t *fin; 2624 nat_t *nat; 2625 natinfo_t *ni; 2626{ 2627 ipf_main_softc_t *softc = fin->fin_main_soft; 2628 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2629 u_short st_port, dport, sport, port, sp, dp; 2630 struct in_addr in, inb; 2631 hostmap_t *hm; 2632 u_32_t flags; 2633 u_32_t st_ip; 2634 ipnat_t *np; 2635 nat_t *natl; 2636 int l; 2637 2638 /* 2639 * If it's an outbound packet which doesn't match any existing 2640 * record, then create a new port 2641 */ 2642 l = 0; 2643 hm = NULL; 2644 np = ni->nai_np; 2645 st_ip = np->in_snip; 2646 st_port = np->in_spnext; 2647 flags = nat->nat_flags; 2648 2649 if (flags & IPN_ICMPQUERY) { 2650 sport = fin->fin_data[1]; 2651 dport = 0; 2652 } else { 2653 sport = htons(fin->fin_data[0]); 2654 dport = htons(fin->fin_data[1]); 2655 } 2656 2657 /* 2658 * Do a loop until we either run out of entries to try or we find 2659 * a NAT mapping that isn't currently being used. This is done 2660 * because the change to the source is not (usually) being fixed. 2661 */ 2662 do { 2663 port = 0; 2664 in.s_addr = htonl(np->in_snip); 2665 if (l == 0) { 2666 /* 2667 * Check to see if there is an existing NAT 2668 * setup for this IP address pair. 2669 */ 2670 hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2671 fin->fin_dst, in, 0); 2672 if (hm != NULL) 2673 in.s_addr = hm->hm_nsrcip.s_addr; 2674 } else if ((l == 1) && (hm != NULL)) { 2675 ipf_nat_hostmapdel(softc, &hm); 2676 } 2677 in.s_addr = ntohl(in.s_addr); 2678 2679 nat->nat_hm = hm; 2680 2681 if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) { 2682 if (l > 0) { 2683 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1); 2684 DT4(ns_exhausted_1, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np); 2685 return -1; 2686 } 2687 } 2688 2689 if (np->in_redir == NAT_BIMAP && 2690 np->in_osrcmsk == np->in_nsrcmsk) { 2691 /* 2692 * map the address block in a 1:1 fashion 2693 */ 2694 in.s_addr = np->in_nsrcaddr; 2695 in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk; 2696 in.s_addr = ntohl(in.s_addr); 2697 2698 } else if (np->in_redir & NAT_MAPBLK) { 2699 if ((l >= np->in_ppip) || ((l > 0) && 2700 !(flags & IPN_TCPUDP))) { 2701 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2); 2702 DT4(ns_exhausted_2, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np); 2703 return -1; 2704 } 2705 /* 2706 * map-block - Calculate destination address. 2707 */ 2708 in.s_addr = ntohl(fin->fin_saddr); 2709 in.s_addr &= ntohl(~np->in_osrcmsk); 2710 inb.s_addr = in.s_addr; 2711 in.s_addr /= np->in_ippip; 2712 in.s_addr &= ntohl(~np->in_nsrcmsk); 2713 in.s_addr += ntohl(np->in_nsrcaddr); 2714 /* 2715 * Calculate destination port. 2716 */ 2717 if ((flags & IPN_TCPUDP) && 2718 (np->in_ppip != 0)) { 2719 port = ntohs(sport) + l; 2720 port %= np->in_ppip; 2721 port += np->in_ppip * 2722 (inb.s_addr % np->in_ippip); 2723 port += MAPBLK_MINPORT; 2724 port = htons(port); 2725 } 2726 2727 } else if ((np->in_nsrcaddr == 0) && 2728 (np->in_nsrcmsk == 0xffffffff)) { 2729 i6addr_t in6; 2730 2731 /* 2732 * 0/32 - use the interface's IP address. 2733 */ 2734 if ((l > 0) || 2735 ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2736 &in6, NULL) == -1) { 2737 NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1); 2738 DT4(ns_new_ifpaddr_1, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np); 2739 return -1; 2740 } 2741 in.s_addr = ntohl(in6.in4.s_addr); 2742 2743 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 2744 /* 2745 * 0/0 - use the original source address/port. 2746 */ 2747 if (l > 0) { 2748 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3); 2749 DT4(ns_exhausted_3, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np); 2750 return -1; 2751 } 2752 in.s_addr = ntohl(fin->fin_saddr); 2753 2754 } else if ((np->in_nsrcmsk != 0xffffffff) && 2755 (np->in_spnext == 0) && ((l > 0) || (hm == NULL))) 2756 np->in_snip++; 2757 2758 natl = NULL; 2759 2760 if ((flags & IPN_TCPUDP) && 2761 ((np->in_redir & NAT_MAPBLK) == 0) && 2762 (np->in_flags & IPN_AUTOPORTMAP)) { 2763 /* 2764 * "ports auto" (without map-block) 2765 */ 2766 if ((l > 0) && (l % np->in_ppip == 0)) { 2767 if ((l > np->in_ppip) && 2768 np->in_nsrcmsk != 0xffffffff) 2769 np->in_snip++; 2770 } 2771 if (np->in_ppip != 0) { 2772 port = ntohs(sport); 2773 port += (l % np->in_ppip); 2774 port %= np->in_ppip; 2775 port += np->in_ppip * 2776 (ntohl(fin->fin_saddr) % 2777 np->in_ippip); 2778 port += MAPBLK_MINPORT; 2779 port = htons(port); 2780 } 2781 2782 } else if (((np->in_redir & NAT_MAPBLK) == 0) && 2783 (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) { 2784 /* 2785 * Standard port translation. Select next port. 2786 */ 2787 if (np->in_flags & IPN_SEQUENTIAL) { 2788 port = np->in_spnext; 2789 } else { 2790 port = ipf_random() % (np->in_spmax - 2791 np->in_spmin + 1); 2792 port += np->in_spmin; 2793 } 2794 port = htons(port); 2795 np->in_spnext++; 2796 2797 if (np->in_spnext > np->in_spmax) { 2798 np->in_spnext = np->in_spmin; 2799 if (np->in_nsrcmsk != 0xffffffff) 2800 np->in_snip++; 2801 } 2802 } 2803 2804 if (np->in_flags & IPN_SIPRANGE) { 2805 if (np->in_snip > ntohl(np->in_nsrcmsk)) 2806 np->in_snip = ntohl(np->in_nsrcaddr); 2807 } else { 2808 if ((np->in_nsrcmsk != 0xffffffff) && 2809 ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) > 2810 ntohl(np->in_nsrcaddr)) 2811 np->in_snip = ntohl(np->in_nsrcaddr) + 1; 2812 } 2813 2814 if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY))) 2815 port = sport; 2816 2817 /* 2818 * Here we do a lookup of the connection as seen from 2819 * the outside. If an IP# pair already exists, try 2820 * again. So if you have A->B becomes C->B, you can 2821 * also have D->E become C->E but not D->B causing 2822 * another C->B. Also take protocol and ports into 2823 * account when determining whether a pre-existing 2824 * NAT setup will cause an external conflict where 2825 * this is appropriate. 2826 */ 2827 inb.s_addr = htonl(in.s_addr); 2828 sp = fin->fin_data[0]; 2829 dp = fin->fin_data[1]; 2830 fin->fin_data[0] = fin->fin_data[1]; 2831 fin->fin_data[1] = ntohs(port); 2832 natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 2833 (u_int)fin->fin_p, fin->fin_dst, inb); 2834 fin->fin_data[0] = sp; 2835 fin->fin_data[1] = dp; 2836 2837 /* 2838 * Has the search wrapped around and come back to the 2839 * start ? 2840 */ 2841 if ((natl != NULL) && 2842 (np->in_spnext != 0) && (st_port == np->in_spnext) && 2843 (np->in_snip != 0) && (st_ip == np->in_snip)) { 2844 NBUMPSIDED(1, ns_wrap); 2845 DT4(ns_wrap, fr_info_t *, fin, nat_t *, nat, natinfo_t *, ni, ipnat_t *, np); 2846 return -1; 2847 } 2848 l++; 2849 } while (natl != NULL); 2850 2851 /* Setup the NAT table */ 2852 nat->nat_osrcip = fin->fin_src; 2853 nat->nat_nsrcaddr = htonl(in.s_addr); 2854 nat->nat_odstip = fin->fin_dst; 2855 nat->nat_ndstip = fin->fin_dst; 2856 if (nat->nat_hm == NULL) 2857 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2858 fin->fin_dst, nat->nat_nsrcip, 2859 0); 2860 2861 if (flags & IPN_TCPUDP) { 2862 nat->nat_osport = sport; 2863 nat->nat_nsport = port; /* sport */ 2864 nat->nat_odport = dport; 2865 nat->nat_ndport = dport; 2866 ((tcphdr_t *)fin->fin_dp)->th_sport = port; 2867 } else if (flags & IPN_ICMPQUERY) { 2868 nat->nat_oicmpid = fin->fin_data[1]; 2869 ((icmphdr_t *)fin->fin_dp)->icmp_id = port; 2870 nat->nat_nicmpid = port; 2871 } 2872 return 0; 2873} 2874 2875 2876/* ------------------------------------------------------------------------ */ 2877/* Function: ipf_nat_newrdr */ 2878/* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 2879/* allow rule to be moved if IPN_ROUNDR is set. */ 2880/* Parameters: fin(I) - pointer to packet information */ 2881/* nat(I) - pointer to NAT entry */ 2882/* ni(I) - pointer to structure with misc. information needed */ 2883/* to create new NAT entry. */ 2884/* */ 2885/* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2886/* to the new IP address for the translation. */ 2887/* ------------------------------------------------------------------------ */ 2888static int 2889ipf_nat_newrdr(fin, nat, ni) 2890 fr_info_t *fin; 2891 nat_t *nat; 2892 natinfo_t *ni; 2893{ 2894 ipf_main_softc_t *softc = fin->fin_main_soft; 2895 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2896 u_short nport, dport, sport; 2897 struct in_addr in, inb; 2898 u_short sp, dp; 2899 hostmap_t *hm; 2900 u_32_t flags; 2901 ipnat_t *np; 2902 nat_t *natl; 2903 int move; 2904 2905 move = 1; 2906 hm = NULL; 2907 in.s_addr = 0; 2908 np = ni->nai_np; 2909 flags = nat->nat_flags; 2910 2911 if (flags & IPN_ICMPQUERY) { 2912 dport = fin->fin_data[1]; 2913 sport = 0; 2914 } else { 2915 sport = htons(fin->fin_data[0]); 2916 dport = htons(fin->fin_data[1]); 2917 } 2918 2919 /* TRACE sport, dport */ 2920 2921 2922 /* 2923 * If the matching rule has IPN_STICKY set, then we want to have the 2924 * same rule kick in as before. Why would this happen? If you have 2925 * a collection of rdr rules with "round-robin sticky", the current 2926 * packet might match a different one to the previous connection but 2927 * we want the same destination to be used. 2928 */ 2929 if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) && 2930 ((np->in_flags & IPN_STICKY) != 0)) { 2931 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst, 2932 in, (u_32_t)dport); 2933 if (hm != NULL) { 2934 in.s_addr = ntohl(hm->hm_ndstip.s_addr); 2935 np = hm->hm_ipnat; 2936 ni->nai_np = np; 2937 move = 0; 2938 ipf_nat_hostmapdel(softc, &hm); 2939 } 2940 } 2941 2942 /* 2943 * Otherwise, it's an inbound packet. Most likely, we don't 2944 * want to rewrite source ports and source addresses. Instead, 2945 * we want to rewrite to a fixed internal address and fixed 2946 * internal port. 2947 */ 2948 if (np->in_flags & IPN_SPLIT) { 2949 in.s_addr = np->in_dnip; 2950 inb.s_addr = htonl(in.s_addr); 2951 2952 if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) { 2953 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, 2954 fin->fin_dst, inb, (u_32_t)dport); 2955 if (hm != NULL) { 2956 in.s_addr = hm->hm_ndstip.s_addr; 2957 move = 0; 2958 } 2959 } 2960 2961 if (hm == NULL || hm->hm_ref == 1) { 2962 if (np->in_ndstaddr == htonl(in.s_addr)) { 2963 np->in_dnip = ntohl(np->in_ndstmsk); 2964 move = 0; 2965 } else { 2966 np->in_dnip = ntohl(np->in_ndstaddr); 2967 } 2968 } 2969 if (hm != NULL) 2970 ipf_nat_hostmapdel(softc, &hm); 2971 2972 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 2973 i6addr_t in6; 2974 2975 /* 2976 * 0/32 - use the interface's IP address. 2977 */ 2978 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2979 &in6, NULL) == -1) { 2980 NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2); 2981 DT3(ns_new_ifpaddr_2, fr_info_t *, fin, nat_t *, nat, natinfo_t, ni); 2982 return -1; 2983 } 2984 in.s_addr = ntohl(in6.in4.s_addr); 2985 2986 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) { 2987 /* 2988 * 0/0 - use the original destination address/port. 2989 */ 2990 in.s_addr = ntohl(fin->fin_daddr); 2991 2992 } else if (np->in_redir == NAT_BIMAP && 2993 np->in_ndstmsk == np->in_odstmsk) { 2994 /* 2995 * map the address block in a 1:1 fashion 2996 */ 2997 in.s_addr = np->in_ndstaddr; 2998 in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk; 2999 in.s_addr = ntohl(in.s_addr); 3000 } else { 3001 in.s_addr = ntohl(np->in_ndstaddr); 3002 } 3003 3004 if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0)) 3005 nport = dport; 3006 else { 3007 /* 3008 * Whilst not optimized for the case where 3009 * pmin == pmax, the gain is not significant. 3010 */ 3011 if (((np->in_flags & IPN_FIXEDDPORT) == 0) && 3012 (np->in_odport != np->in_dtop)) { 3013 nport = ntohs(dport) - np->in_odport + np->in_dpmax; 3014 nport = htons(nport); 3015 } else { 3016 nport = htons(np->in_dpnext); 3017 np->in_dpnext++; 3018 if (np->in_dpnext > np->in_dpmax) 3019 np->in_dpnext = np->in_dpmin; 3020 } 3021 } 3022 3023 /* 3024 * When the redirect-to address is set to 0.0.0.0, just 3025 * assume a blank `forwarding' of the packet. We don't 3026 * setup any translation for this either. 3027 */ 3028 if (in.s_addr == 0) { 3029 if (nport == dport) { 3030 NBUMPSIDED(0, ns_xlate_null); 3031 return -1; 3032 } 3033 in.s_addr = ntohl(fin->fin_daddr); 3034 } 3035 3036 /* 3037 * Check to see if this redirect mapping already exists and if 3038 * it does, return "failure" (allowing it to be created will just 3039 * cause one or both of these "connections" to stop working.) 3040 */ 3041 inb.s_addr = htonl(in.s_addr); 3042 sp = fin->fin_data[0]; 3043 dp = fin->fin_data[1]; 3044 fin->fin_data[1] = fin->fin_data[0]; 3045 fin->fin_data[0] = ntohs(nport); 3046 natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 3047 (u_int)fin->fin_p, inb, fin->fin_src); 3048 fin->fin_data[0] = sp; 3049 fin->fin_data[1] = dp; 3050 if (natl != NULL) { 3051 DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl); 3052 NBUMPSIDE(0, ns_xlate_exists); 3053 return -1; 3054 } 3055 3056 inb.s_addr = htonl(in.s_addr); 3057 nat->nat_ndstaddr = htonl(in.s_addr); 3058 nat->nat_odstip = fin->fin_dst; 3059 nat->nat_nsrcip = fin->fin_src; 3060 nat->nat_osrcip = fin->fin_src; 3061 if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0)) 3062 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 3063 fin->fin_dst, inb, (u_32_t)dport); 3064 3065 if (flags & IPN_TCPUDP) { 3066 nat->nat_odport = dport; 3067 nat->nat_ndport = nport; 3068 nat->nat_osport = sport; 3069 nat->nat_nsport = sport; 3070 ((tcphdr_t *)fin->fin_dp)->th_dport = nport; 3071 } else if (flags & IPN_ICMPQUERY) { 3072 nat->nat_oicmpid = fin->fin_data[1]; 3073 ((icmphdr_t *)fin->fin_dp)->icmp_id = nport; 3074 nat->nat_nicmpid = nport; 3075 } 3076 3077 return move; 3078} 3079 3080/* ------------------------------------------------------------------------ */ 3081/* Function: ipf_nat_add */ 3082/* Returns: nat_t* - NULL == failure to create new NAT structure, */ 3083/* else pointer to new NAT structure */ 3084/* Parameters: fin(I) - pointer to packet information */ 3085/* np(I) - pointer to NAT rule */ 3086/* natsave(I) - pointer to where to store NAT struct pointer */ 3087/* flags(I) - flags describing the current packet */ 3088/* direction(I) - direction of packet (in/out) */ 3089/* Write Lock: ipf_nat */ 3090/* */ 3091/* Attempts to create a new NAT entry. Does not actually change the packet */ 3092/* in any way. */ 3093/* */ 3094/* This fucntion is in three main parts: (1) deal with creating a new NAT */ 3095/* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */ 3096/* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */ 3097/* and (3) building that structure and putting it into the NAT table(s). */ 3098/* */ 3099/* NOTE: natsave should NOT be used top point back to an ipstate_t struct */ 3100/* as it can result in memory being corrupted. */ 3101/* ------------------------------------------------------------------------ */ 3102nat_t * 3103ipf_nat_add(fin, np, natsave, flags, direction) 3104 fr_info_t *fin; 3105 ipnat_t *np; 3106 nat_t **natsave; 3107 u_int flags; 3108 int direction; 3109{ 3110 ipf_main_softc_t *softc = fin->fin_main_soft; 3111 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3112 hostmap_t *hm = NULL; 3113 nat_t *nat, *natl; 3114 natstat_t *nsp; 3115 u_int nflags; 3116 natinfo_t ni; 3117 int move; 3118 3119 nsp = &softn->ipf_nat_stats; 3120 3121 if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) > 3122 softn->ipf_nat_table_wm_high) { 3123 softn->ipf_nat_doflush = 1; 3124 } 3125 3126 if (nsp->ns_active >= softn->ipf_nat_table_max) { 3127 NBUMPSIDED(fin->fin_out, ns_table_max); 3128 DT2(ns_table_max, nat_stat_t *, nsp, ipf_nat_softc_t *, softn); 3129 return NULL; 3130 } 3131 3132 move = 1; 3133 nflags = np->in_flags & flags; 3134 nflags &= NAT_FROMRULE; 3135 3136 ni.nai_np = np; 3137 ni.nai_dport = 0; 3138 ni.nai_sport = 0; 3139 3140 /* Give me a new nat */ 3141 KMALLOC(nat, nat_t *); 3142 if (nat == NULL) { 3143 DT(ns_memfail); 3144 NBUMPSIDED(fin->fin_out, ns_memfail); 3145 /* 3146 * Try to automatically tune the max # of entries in the 3147 * table allowed to be less than what will cause kmem_alloc() 3148 * to fail and try to eliminate panics due to out of memory 3149 * conditions arising. 3150 */ 3151 if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) && 3152 (nsp->ns_active > 100)) { 3153 softn->ipf_nat_table_max = nsp->ns_active - 100; 3154 printf("table_max reduced to %d\n", 3155 softn->ipf_nat_table_max); 3156 } 3157 return NULL; 3158 } 3159 3160 if (flags & IPN_ICMPQUERY) { 3161 /* 3162 * In the ICMP query NAT code, we translate the ICMP id fields 3163 * to make them unique. This is indepedent of the ICMP type 3164 * (e.g. in the unlikely event that a host sends an echo and 3165 * an tstamp request with the same id, both packets will have 3166 * their ip address/id field changed in the same way). 3167 */ 3168 /* The icmp_id field is used by the sender to identify the 3169 * process making the icmp request. (the receiver justs 3170 * copies it back in its response). So, it closely matches 3171 * the concept of source port. We overlay sport, so we can 3172 * maximally reuse the existing code. 3173 */ 3174 ni.nai_sport = fin->fin_data[1]; 3175 ni.nai_dport = 0; 3176 } 3177 3178 bzero((char *)nat, sizeof(*nat)); 3179 nat->nat_flags = flags; 3180 nat->nat_redir = np->in_redir; 3181 nat->nat_dir = direction; 3182 nat->nat_pr[0] = fin->fin_p; 3183 nat->nat_pr[1] = fin->fin_p; 3184 3185 /* 3186 * Search the current table for a match and create a new mapping 3187 * if there is none found. 3188 */ 3189 if (np->in_redir & NAT_DIVERTUDP) { 3190 move = ipf_nat_newdivert(fin, nat, &ni); 3191 3192 } else if (np->in_redir & NAT_REWRITE) { 3193 move = ipf_nat_newrewrite(fin, nat, &ni); 3194 3195 } else if (direction == NAT_OUTBOUND) { 3196 /* 3197 * We can now arrange to call this for the same connection 3198 * because ipf_nat_new doesn't protect the code path into 3199 * this function. 3200 */ 3201 natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 3202 fin->fin_src, fin->fin_dst); 3203 if (natl != NULL) { 3204 KFREE(nat); 3205 nat = natl; 3206 goto done; 3207 } 3208 3209 move = ipf_nat_newmap(fin, nat, &ni); 3210 } else { 3211 /* 3212 * NAT_INBOUND is used for redirects rules 3213 */ 3214 natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 3215 fin->fin_src, fin->fin_dst); 3216 if (natl != NULL) { 3217 KFREE(nat); 3218 nat = natl; 3219 goto done; 3220 } 3221 3222 move = ipf_nat_newrdr(fin, nat, &ni); 3223 } 3224 if (move == -1) 3225 goto badnat; 3226 3227 np = ni.nai_np; 3228 3229 nat->nat_mssclamp = np->in_mssclamp; 3230 nat->nat_me = natsave; 3231 nat->nat_fr = fin->fin_fr; 3232 nat->nat_rev = fin->fin_rev; 3233 nat->nat_ptr = np; 3234 nat->nat_dlocal = np->in_dlocal; 3235 3236 if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) { 3237 if (ipf_proxy_new(fin, nat) == -1) { 3238 NBUMPSIDED(fin->fin_out, ns_appr_fail); 3239 DT3(ns_appr_fail, fr_info_t *, fin, nat_t *, nat, ipnat_t *, np); 3240 goto badnat; 3241 } 3242 } 3243 3244 nat->nat_ifps[0] = np->in_ifps[0]; 3245 if (np->in_ifps[0] != NULL) { 3246 COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]); 3247 } 3248 3249 nat->nat_ifps[1] = np->in_ifps[1]; 3250 if (np->in_ifps[1] != NULL) { 3251 COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]); 3252 } 3253 3254 if (ipf_nat_finalise(fin, nat) == -1) { 3255 goto badnat; 3256 } 3257 3258 np->in_use++; 3259 3260 if ((move == 1) && (np->in_flags & IPN_ROUNDR)) { 3261 if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) { 3262 ipf_nat_delrdr(softn, np); 3263 ipf_nat_addrdr(softn, np); 3264 } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) { 3265 ipf_nat_delmap(softn, np); 3266 ipf_nat_addmap(softn, np); 3267 } 3268 } 3269 3270 if (flags & SI_WILDP) 3271 nsp->ns_wilds++; 3272 nsp->ns_proto[nat->nat_pr[0]]++; 3273 3274 goto done; 3275badnat: 3276 DT3(ns_badnatnew, fr_info_t *, fin, nat_t *, nat, ipnat_t *, np); 3277 NBUMPSIDE(fin->fin_out, ns_badnatnew); 3278 if ((hm = nat->nat_hm) != NULL) 3279 ipf_nat_hostmapdel(softc, &hm); 3280 KFREE(nat); 3281 nat = NULL; 3282done: 3283 if (nat != NULL && np != NULL) 3284 np->in_hits++; 3285 if (natsave != NULL) 3286 *natsave = nat; 3287 return nat; 3288} 3289 3290 3291/* ------------------------------------------------------------------------ */ 3292/* Function: ipf_nat_finalise */ 3293/* Returns: int - 0 == sucess, -1 == failure */ 3294/* Parameters: fin(I) - pointer to packet information */ 3295/* nat(I) - pointer to NAT entry */ 3296/* Write Lock: ipf_nat */ 3297/* */ 3298/* This is the tail end of constructing a new NAT entry and is the same */ 3299/* for both IPv4 and IPv6. */ 3300/* ------------------------------------------------------------------------ */ 3301/*ARGSUSED*/ 3302static int 3303ipf_nat_finalise(fin, nat) 3304 fr_info_t *fin; 3305 nat_t *nat; 3306{ 3307 ipf_main_softc_t *softc = fin->fin_main_soft; 3308 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3309 u_32_t sum1, sum2, sumd; 3310 frentry_t *fr; 3311 u_32_t flags; 3312#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC) 3313 qpktinfo_t *qpi = fin->fin_qpi; 3314#endif 3315 3316 flags = nat->nat_flags; 3317 3318 switch (nat->nat_pr[0]) 3319 { 3320 case IPPROTO_ICMP : 3321 sum1 = LONG_SUM(ntohs(nat->nat_oicmpid)); 3322 sum2 = LONG_SUM(ntohs(nat->nat_nicmpid)); 3323 CALC_SUMD(sum1, sum2, sumd); 3324 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3325 3326 break; 3327 3328 default : 3329 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \ 3330 ntohs(nat->nat_osport)); 3331 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \ 3332 ntohs(nat->nat_nsport)); 3333 CALC_SUMD(sum1, sum2, sumd); 3334 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3335 3336 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \ 3337 ntohs(nat->nat_odport)); 3338 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \ 3339 ntohs(nat->nat_ndport)); 3340 CALC_SUMD(sum1, sum2, sumd); 3341 nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); 3342 break; 3343 } 3344 3345 /* 3346 * Compute the partial checksum, just in case. 3347 * This is only ever placed into outbound packets so care needs 3348 * to be taken over which pair of addresses are used. 3349 */ 3350 if (nat->nat_dir == NAT_OUTBOUND) { 3351 sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3352 sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr)); 3353 } else { 3354 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3355 sum1 += LONG_SUM(ntohl(nat->nat_odstaddr)); 3356 } 3357 sum1 += nat->nat_pr[1]; 3358 nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16); 3359 3360 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3361 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3362 CALC_SUMD(sum1, sum2, sumd); 3363 nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16); 3364 3365 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr)); 3366 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 3367 CALC_SUMD(sum1, sum2, sumd); 3368 nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16); 3369 3370 nat->nat_v[0] = 4; 3371 nat->nat_v[1] = 4; 3372 3373 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3374 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3375 } 3376 3377 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3378 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3379 } 3380 3381 if ((nat->nat_flags & SI_CLONE) == 0) 3382 nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat); 3383 3384 if (ipf_nat_insert(softc, softn, nat) == 0) { 3385 if (softn->ipf_nat_logging) 3386 ipf_nat_log(softc, softn, nat, NL_NEW); 3387 fr = nat->nat_fr; 3388 if (fr != NULL) { 3389 MUTEX_ENTER(&fr->fr_lock); 3390 fr->fr_ref++; 3391 MUTEX_EXIT(&fr->fr_lock); 3392 } 3393 return 0; 3394 } 3395 3396 NBUMPSIDED(fin->fin_out, ns_unfinalised); 3397 DT2(ns_unfinalised, fr_info_t *, fin, nat_t *, nat); 3398 /* 3399 * nat_insert failed, so cleanup time... 3400 */ 3401 if (nat->nat_sync != NULL) 3402 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 3403 return -1; 3404} 3405 3406 3407/* ------------------------------------------------------------------------ */ 3408/* Function: ipf_nat_insert */ 3409/* Returns: int - 0 == sucess, -1 == failure */ 3410/* Parameters: softc(I) - pointer to soft context main structure */ 3411/* softn(I) - pointer to NAT context structure */ 3412/* nat(I) - pointer to NAT structure */ 3413/* Write Lock: ipf_nat */ 3414/* */ 3415/* Insert a NAT entry into the hash tables for searching and add it to the */ 3416/* list of active NAT entries. Adjust global counters when complete. */ 3417/* ------------------------------------------------------------------------ */ 3418int 3419ipf_nat_insert(softc, softn, nat) 3420 ipf_main_softc_t *softc; 3421 ipf_nat_softc_t *softn; 3422 nat_t *nat; 3423{ 3424 u_int hv0, hv1; 3425 u_int sp, dp; 3426 ipnat_t *in; 3427 3428 /* 3429 * Try and return an error as early as possible, so calculate the hash 3430 * entry numbers first and then proceed. 3431 */ 3432 if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) { 3433 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3434 sp = nat->nat_osport; 3435 dp = nat->nat_odport; 3436 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3437 sp = 0; 3438 dp = nat->nat_oicmpid; 3439 } else { 3440 sp = 0; 3441 dp = 0; 3442 } 3443 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff); 3444 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff); 3445 /* 3446 * TRACE nat_osrcaddr, nat_osport, nat_odstaddr, 3447 * nat_odport, hv0 3448 */ 3449 3450 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3451 sp = nat->nat_nsport; 3452 dp = nat->nat_ndport; 3453 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3454 sp = 0; 3455 dp = nat->nat_nicmpid; 3456 } else { 3457 sp = 0; 3458 dp = 0; 3459 } 3460 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff); 3461 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff); 3462 /* 3463 * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, 3464 * nat_ndport, hv1 3465 */ 3466 } else { 3467 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff); 3468 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff); 3469 /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */ 3470 3471 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff); 3472 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff); 3473 /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */ 3474 } 3475 3476 nat->nat_hv[0] = hv0; 3477 nat->nat_hv[1] = hv1; 3478 3479 MUTEX_INIT(&nat->nat_lock, "nat entry lock"); 3480 3481 in = nat->nat_ptr; 3482 nat->nat_ref = nat->nat_me ? 2 : 1; 3483 3484 nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0'; 3485 nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4); 3486 3487 if (nat->nat_ifnames[1][0] != '\0') { 3488 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3489 nat->nat_ifps[1] = ipf_resolvenic(softc, 3490 nat->nat_ifnames[1], 4); 3491 } else if (in->in_ifnames[1] != -1) { 3492 char *name; 3493 3494 name = in->in_names + in->in_ifnames[1]; 3495 if (name[1] != '\0' && name[0] != '-' && name[0] != '*') { 3496 (void) strncpy(nat->nat_ifnames[1], 3497 nat->nat_ifnames[0], LIFNAMSIZ); 3498 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3499 nat->nat_ifps[1] = nat->nat_ifps[0]; 3500 } 3501 } 3502 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3503 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3504 } 3505 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3506 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3507 } 3508 3509 return ipf_nat_hashtab_add(softc, softn, nat); 3510} 3511 3512 3513/* ------------------------------------------------------------------------ */ 3514/* Function: ipf_nat_hashtab_add */ 3515/* Parameters: softc(I) - pointer to soft context main structure */ 3516/* softn(I) - pointer to NAT context structure */ 3517/* nat(I) - pointer to NAT structure */ 3518/* */ 3519/* Handle the insertion of a NAT entry into the table/list. */ 3520/* ------------------------------------------------------------------------ */ 3521int 3522ipf_nat_hashtab_add(softc, softn, nat) 3523 ipf_main_softc_t *softc; 3524 ipf_nat_softc_t *softn; 3525 nat_t *nat; 3526{ 3527 nat_t **natp; 3528 u_int hv0; 3529 u_int hv1; 3530 3531 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 3532 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 3533 3534 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) { 3535 u_int swap; 3536 3537 swap = hv0; 3538 hv0 = hv1; 3539 hv1 = swap; 3540 } 3541 3542 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >= 3543 softn->ipf_nat_maxbucket) { 3544 DT1(ns_bucket_max_0, int, 3545 softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]); 3546 NBUMPSIDE(0, ns_bucket_max); 3547 return -1; 3548 } 3549 3550 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >= 3551 softn->ipf_nat_maxbucket) { 3552 DT1(ns_bucket_max_1, int, 3553 softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]); 3554 NBUMPSIDE(1, ns_bucket_max); 3555 return -1; 3556 } 3557 3558 /* 3559 * The ordering of operations in the list and hash table insertion 3560 * is very important. The last operation for each task should be 3561 * to update the top of the list, after all the "nexts" have been 3562 * done so that walking the list while it is being done does not 3563 * find strange pointers. 3564 * 3565 * Global list of NAT instances 3566 */ 3567 nat->nat_next = softn->ipf_nat_instances; 3568 nat->nat_pnext = &softn->ipf_nat_instances; 3569 if (softn->ipf_nat_instances) 3570 softn->ipf_nat_instances->nat_pnext = &nat->nat_next; 3571 softn->ipf_nat_instances = nat; 3572 3573 /* 3574 * Inbound hash table. 3575 */ 3576 natp = &softn->ipf_nat_table[0][hv0]; 3577 nat->nat_phnext[0] = natp; 3578 nat->nat_hnext[0] = *natp; 3579 if (*natp) { 3580 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 3581 } else { 3582 NBUMPSIDE(0, ns_inuse); 3583 } 3584 *natp = nat; 3585 NBUMPSIDE(0, ns_bucketlen[hv0]); 3586 3587 /* 3588 * Outbound hash table. 3589 */ 3590 natp = &softn->ipf_nat_table[1][hv1]; 3591 nat->nat_phnext[1] = natp; 3592 nat->nat_hnext[1] = *natp; 3593 if (*natp) 3594 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 3595 else { 3596 NBUMPSIDE(1, ns_inuse); 3597 } 3598 *natp = nat; 3599 NBUMPSIDE(1, ns_bucketlen[hv1]); 3600 3601 ipf_nat_setqueue(softc, softn, nat); 3602 3603 if (nat->nat_dir & NAT_OUTBOUND) { 3604 NBUMPSIDE(1, ns_added); 3605 } else { 3606 NBUMPSIDE(0, ns_added); 3607 } 3608 softn->ipf_nat_stats.ns_active++; 3609 return 0; 3610} 3611 3612 3613/* ------------------------------------------------------------------------ */ 3614/* Function: ipf_nat_icmperrorlookup */ 3615/* Returns: nat_t* - point to matching NAT structure */ 3616/* Parameters: fin(I) - pointer to packet information */ 3617/* dir(I) - direction of packet (in/out) */ 3618/* */ 3619/* Check if the ICMP error message is related to an existing TCP, UDP or */ 3620/* ICMP query nat entry. It is assumed that the packet is already of the */ 3621/* the required length. */ 3622/* ------------------------------------------------------------------------ */ 3623nat_t * 3624ipf_nat_icmperrorlookup(fin, dir) 3625 fr_info_t *fin; 3626 int dir; 3627{ 3628 ipf_main_softc_t *softc = fin->fin_main_soft; 3629 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3630 int flags = 0, type, minlen; 3631 icmphdr_t *icmp, *orgicmp; 3632 nat_stat_side_t *nside; 3633 tcphdr_t *tcp = NULL; 3634 u_short data[2]; 3635 nat_t *nat; 3636 ip_t *oip; 3637 u_int p; 3638 3639 icmp = fin->fin_dp; 3640 type = icmp->icmp_type; 3641 nside = &softn->ipf_nat_stats.ns_side[fin->fin_out]; 3642 /* 3643 * Does it at least have the return (basic) IP header ? 3644 * Only a basic IP header (no options) should be with an ICMP error 3645 * header. Also, if it's not an error type, then return. 3646 */ 3647 if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) { 3648 ATOMIC_INCL(nside->ns_icmp_basic); 3649 return NULL; 3650 } 3651 3652 /* 3653 * Check packet size 3654 */ 3655 oip = (ip_t *)((char *)fin->fin_dp + 8); 3656 minlen = IP_HL(oip) << 2; 3657 if ((minlen < sizeof(ip_t)) || 3658 (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) { 3659 ATOMIC_INCL(nside->ns_icmp_size); 3660 return NULL; 3661 } 3662 3663 /* 3664 * Is the buffer big enough for all of it ? It's the size of the IP 3665 * header claimed in the encapsulated part which is of concern. It 3666 * may be too big to be in this buffer but not so big that it's 3667 * outside the ICMP packet, leading to TCP deref's causing problems. 3668 * This is possible because we don't know how big oip_hl is when we 3669 * do the pullup early in ipf_check() and thus can't gaurantee it is 3670 * all here now. 3671 */ 3672#ifdef ipf_nat_KERNEL 3673 { 3674 mb_t *m; 3675 3676 m = fin->fin_m; 3677# if defined(MENTAT) 3678 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3679 (char *)m->b_wptr) { 3680 ATOMIC_INCL(nside->ns_icmp_mbuf); 3681 return NULL; 3682 } 3683# else 3684 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3685 (char *)fin->fin_ip + M_LEN(m)) { 3686 ATOMIC_INCL(nside->ns_icmp_mbuf); 3687 return NULL; 3688 } 3689# endif 3690 } 3691#endif 3692 3693 if (fin->fin_daddr != oip->ip_src.s_addr) { 3694 ATOMIC_INCL(nside->ns_icmp_address); 3695 return NULL; 3696 } 3697 3698 p = oip->ip_p; 3699 if (p == IPPROTO_TCP) 3700 flags = IPN_TCP; 3701 else if (p == IPPROTO_UDP) 3702 flags = IPN_UDP; 3703 else if (p == IPPROTO_ICMP) { 3704 orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3705 3706 /* see if this is related to an ICMP query */ 3707 if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) { 3708 data[0] = fin->fin_data[0]; 3709 data[1] = fin->fin_data[1]; 3710 fin->fin_data[0] = 0; 3711 fin->fin_data[1] = orgicmp->icmp_id; 3712 3713 flags = IPN_ICMPERR|IPN_ICMPQUERY; 3714 /* 3715 * NOTE : dir refers to the direction of the original 3716 * ip packet. By definition the icmp error 3717 * message flows in the opposite direction. 3718 */ 3719 if (dir == NAT_INBOUND) 3720 nat = ipf_nat_inlookup(fin, flags, p, 3721 oip->ip_dst, 3722 oip->ip_src); 3723 else 3724 nat = ipf_nat_outlookup(fin, flags, p, 3725 oip->ip_dst, 3726 oip->ip_src); 3727 fin->fin_data[0] = data[0]; 3728 fin->fin_data[1] = data[1]; 3729 return nat; 3730 } 3731 } 3732 3733 if (flags & IPN_TCPUDP) { 3734 minlen += 8; /* + 64bits of data to get ports */ 3735 /* TRACE (fin,minlen) */ 3736 if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) { 3737 ATOMIC_INCL(nside->ns_icmp_short); 3738 return NULL; 3739 } 3740 3741 data[0] = fin->fin_data[0]; 3742 data[1] = fin->fin_data[1]; 3743 tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3744 fin->fin_data[0] = ntohs(tcp->th_dport); 3745 fin->fin_data[1] = ntohs(tcp->th_sport); 3746 3747 if (dir == NAT_INBOUND) { 3748 nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst, 3749 oip->ip_src); 3750 } else { 3751 nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst, 3752 oip->ip_src); 3753 } 3754 fin->fin_data[0] = data[0]; 3755 fin->fin_data[1] = data[1]; 3756 return nat; 3757 } 3758 if (dir == NAT_INBOUND) 3759 nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3760 else 3761 nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3762 3763 return nat; 3764} 3765 3766 3767/* ------------------------------------------------------------------------ */ 3768/* Function: ipf_nat_icmperror */ 3769/* Returns: nat_t* - point to matching NAT structure */ 3770/* Parameters: fin(I) - pointer to packet information */ 3771/* nflags(I) - NAT flags for this packet */ 3772/* dir(I) - direction of packet (in/out) */ 3773/* */ 3774/* Fix up an ICMP packet which is an error message for an existing NAT */ 3775/* session. This will correct both packet header data and checksums. */ 3776/* */ 3777/* This should *ONLY* be used for incoming ICMP error packets to make sure */ 3778/* a NAT'd ICMP packet gets correctly recognised. */ 3779/* ------------------------------------------------------------------------ */ 3780nat_t * 3781ipf_nat_icmperror(fin, nflags, dir) 3782 fr_info_t *fin; 3783 u_int *nflags; 3784 int dir; 3785{ 3786 ipf_main_softc_t *softc = fin->fin_main_soft; 3787 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3788 u_32_t sum1, sum2, sumd, sumd2; 3789 struct in_addr a1, a2, a3, a4; 3790 int flags, dlen, odst; 3791 icmphdr_t *icmp; 3792 u_short *csump; 3793 tcphdr_t *tcp; 3794 nat_t *nat; 3795 ip_t *oip; 3796 void *dp; 3797 3798 if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 3799 NBUMPSIDED(fin->fin_out, ns_icmp_short); 3800 return NULL; 3801 } 3802 3803 /* 3804 * ipf_nat_icmperrorlookup() will return NULL for `defective' packets. 3805 */ 3806 if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) { 3807 NBUMPSIDED(fin->fin_out, ns_icmp_notfound); 3808 return NULL; 3809 } 3810 3811 tcp = NULL; 3812 csump = NULL; 3813 flags = 0; 3814 sumd2 = 0; 3815 *nflags = IPN_ICMPERR; 3816 icmp = fin->fin_dp; 3817 oip = (ip_t *)&icmp->icmp_ip; 3818 dp = (((char *)oip) + (IP_HL(oip) << 2)); 3819 if (oip->ip_p == IPPROTO_TCP) { 3820 tcp = (tcphdr_t *)dp; 3821 csump = (u_short *)&tcp->th_sum; 3822 flags = IPN_TCP; 3823 } else if (oip->ip_p == IPPROTO_UDP) { 3824 udphdr_t *udp; 3825 3826 udp = (udphdr_t *)dp; 3827 tcp = (tcphdr_t *)dp; 3828 csump = (u_short *)&udp->uh_sum; 3829 flags = IPN_UDP; 3830 } else if (oip->ip_p == IPPROTO_ICMP) 3831 flags = IPN_ICMPQUERY; 3832 dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip); 3833 3834 /* 3835 * Need to adjust ICMP header to include the real IP#'s and 3836 * port #'s. Only apply a checksum change relative to the 3837 * IP address change as it will be modified again in ipf_nat_checkout 3838 * for both address and port. Two checksum changes are 3839 * necessary for the two header address changes. Be careful 3840 * to only modify the checksum once for the port # and twice 3841 * for the IP#. 3842 */ 3843 3844 /* 3845 * Step 1 3846 * Fix the IP addresses in the offending IP packet. You also need 3847 * to adjust the IP header checksum of that offending IP packet. 3848 * 3849 * Normally, you would expect that the ICMP checksum of the 3850 * ICMP error message needs to be adjusted as well for the 3851 * IP address change in oip. 3852 * However, this is a NOP, because the ICMP checksum is 3853 * calculated over the complete ICMP packet, which includes the 3854 * changed oip IP addresses and oip->ip_sum. However, these 3855 * two changes cancel each other out (if the delta for 3856 * the IP address is x, then the delta for ip_sum is minus x), 3857 * so no change in the icmp_cksum is necessary. 3858 * 3859 * Inbound ICMP 3860 * ------------ 3861 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3862 * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b) 3863 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip 3864 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip 3865 * 3866 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3867 * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3868 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3869 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3870 * 3871 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3872 * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d) 3873 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip 3874 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip 3875 * 3876 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3877 * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3878 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3879 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3880 * 3881 * Outbound ICMP 3882 * ------------- 3883 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3884 * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3885 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3886 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3887 * 3888 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3889 * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c) 3890 * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip 3891 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3892 * 3893 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3894 * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d) 3895 * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip 3896 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3897 * 3898 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3899 * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a) 3900 * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip 3901 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3902 */ 3903 3904 if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) || 3905 ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) { 3906 a1.s_addr = ntohl(nat->nat_osrcaddr); 3907 a4.s_addr = ntohl(oip->ip_src.s_addr); 3908 a3.s_addr = ntohl(nat->nat_odstaddr); 3909 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3910 oip->ip_src.s_addr = htonl(a1.s_addr); 3911 oip->ip_dst.s_addr = htonl(a3.s_addr); 3912 odst = 1; 3913 } else { 3914 a1.s_addr = ntohl(nat->nat_ndstaddr); 3915 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3916 a3.s_addr = ntohl(nat->nat_nsrcaddr); 3917 a4.s_addr = ntohl(oip->ip_src.s_addr); 3918 oip->ip_dst.s_addr = htonl(a3.s_addr); 3919 oip->ip_src.s_addr = htonl(a1.s_addr); 3920 odst = 0; 3921 } 3922 sum1 = 0; 3923 sum2 = 0; 3924 sumd = 0; 3925 CALC_SUMD(a2.s_addr, a3.s_addr, sum1); 3926 CALC_SUMD(a4.s_addr, a1.s_addr, sum2); 3927 sumd = sum2 + sum1; 3928 if (sumd != 0) 3929 ipf_fix_datacksum(&oip->ip_sum, sumd); 3930 3931 sumd2 = sumd; 3932 sum1 = 0; 3933 sum2 = 0; 3934 3935 /* 3936 * Fix UDP pseudo header checksum to compensate for the 3937 * IP address change. 3938 */ 3939 if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) { 3940 u_32_t sum3, sum4, sumt; 3941 3942 /* 3943 * Step 2 : 3944 * For offending TCP/UDP IP packets, translate the ports as 3945 * well, based on the NAT specification. Of course such 3946 * a change may be reflected in the ICMP checksum as well. 3947 * 3948 * Since the port fields are part of the TCP/UDP checksum 3949 * of the offending IP packet, you need to adjust that checksum 3950 * as well... except that the change in the port numbers should 3951 * be offset by the checksum change. However, the TCP/UDP 3952 * checksum will also need to change if there has been an 3953 * IP address change. 3954 */ 3955 if (odst == 1) { 3956 sum1 = ntohs(nat->nat_osport); 3957 sum4 = ntohs(tcp->th_sport); 3958 sum3 = ntohs(nat->nat_odport); 3959 sum2 = ntohs(tcp->th_dport); 3960 3961 tcp->th_sport = htons(sum1); 3962 tcp->th_dport = htons(sum3); 3963 } else { 3964 sum1 = ntohs(nat->nat_ndport); 3965 sum2 = ntohs(tcp->th_dport); 3966 sum3 = ntohs(nat->nat_nsport); 3967 sum4 = ntohs(tcp->th_sport); 3968 3969 tcp->th_dport = htons(sum3); 3970 tcp->th_sport = htons(sum1); 3971 } 3972 CALC_SUMD(sum4, sum1, sumt); 3973 sumd += sumt; 3974 CALC_SUMD(sum2, sum3, sumt); 3975 sumd += sumt; 3976 3977 if (sumd != 0 || sumd2 != 0) { 3978 /* 3979 * At this point, sumd is the delta to apply to the 3980 * TCP/UDP header, given the changes in both the IP 3981 * address and the ports and sumd2 is the delta to 3982 * apply to the ICMP header, given the IP address 3983 * change delta that may need to be applied to the 3984 * TCP/UDP checksum instead. 3985 * 3986 * If we will both the IP and TCP/UDP checksums 3987 * then the ICMP checksum changes by the address 3988 * delta applied to the TCP/UDP checksum. If we 3989 * do not change the TCP/UDP checksum them we 3990 * apply the delta in ports to the ICMP checksum. 3991 */ 3992 if (oip->ip_p == IPPROTO_UDP) { 3993 if ((dlen >= 8) && (*csump != 0)) { 3994 ipf_fix_datacksum(csump, sumd); 3995 } else { 3996 CALC_SUMD(sum1, sum4, sumd2); 3997 CALC_SUMD(sum3, sum2, sumt); 3998 sumd2 += sumt; 3999 } 4000 } else if (oip->ip_p == IPPROTO_TCP) { 4001 if (dlen >= 18) { 4002 ipf_fix_datacksum(csump, sumd); 4003 } else { 4004 CALC_SUMD(sum1, sum4, sumd2); 4005 CALC_SUMD(sum3, sum2, sumt); 4006 sumd2 += sumt; 4007 } 4008 } 4009 if (sumd2 != 0) { 4010 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 4011 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 4012 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 4013 ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0); 4014 } 4015 } 4016 } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) { 4017 icmphdr_t *orgicmp; 4018 4019 /* 4020 * XXX - what if this is bogus hl and we go off the end ? 4021 * In this case, ipf_nat_icmperrorlookup() will have 4022 * returned NULL. 4023 */ 4024 orgicmp = (icmphdr_t *)dp; 4025 4026 if (odst == 1) { 4027 if (orgicmp->icmp_id != nat->nat_osport) { 4028 4029 /* 4030 * Fix ICMP checksum (of the offening ICMP 4031 * query packet) to compensate the change 4032 * in the ICMP id of the offending ICMP 4033 * packet. 4034 * 4035 * Since you modify orgicmp->icmp_id with 4036 * a delta (say x) and you compensate that 4037 * in origicmp->icmp_cksum with a delta 4038 * minus x, you don't have to adjust the 4039 * overall icmp->icmp_cksum 4040 */ 4041 sum1 = ntohs(orgicmp->icmp_id); 4042 sum2 = ntohs(nat->nat_oicmpid); 4043 CALC_SUMD(sum1, sum2, sumd); 4044 orgicmp->icmp_id = nat->nat_oicmpid; 4045 ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd); 4046 } 4047 } /* nat_dir == NAT_INBOUND is impossible for icmp queries */ 4048 } 4049 return nat; 4050} 4051 4052 4053/* 4054 * MAP-IN MAP-OUT RDR-IN RDR-OUT 4055 * osrc X == src == src X 4056 * odst X == dst == dst X 4057 * nsrc == dst X X == dst 4058 * ndst == src X X == src 4059 * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND 4060 */ 4061/* 4062 * NB: these lookups don't lock access to the list, it assumed that it has 4063 * already been done! 4064 */ 4065/* ------------------------------------------------------------------------ */ 4066/* Function: ipf_nat_inlookup */ 4067/* Returns: nat_t* - NULL == no match, */ 4068/* else pointer to matching NAT entry */ 4069/* Parameters: fin(I) - pointer to packet information */ 4070/* flags(I) - NAT flags for this packet */ 4071/* p(I) - protocol for this packet */ 4072/* src(I) - source IP address */ 4073/* mapdst(I) - destination IP address */ 4074/* */ 4075/* Lookup a nat entry based on the mapped destination ip address/port and */ 4076/* real source address/port. We use this lookup when receiving a packet, */ 4077/* we're looking for a table entry, based on the destination address. */ 4078/* */ 4079/* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4080/* */ 4081/* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4082/* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4083/* */ 4084/* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4085/* the packet is of said protocol */ 4086/* ------------------------------------------------------------------------ */ 4087nat_t * 4088ipf_nat_inlookup(fin, flags, p, src, mapdst) 4089 fr_info_t *fin; 4090 u_int flags, p; 4091 struct in_addr src , mapdst; 4092{ 4093 ipf_main_softc_t *softc = fin->fin_main_soft; 4094 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4095 u_short sport, dport; 4096 grehdr_t *gre; 4097 ipnat_t *ipn; 4098 u_int sflags; 4099 nat_t *nat; 4100 int nflags; 4101 u_32_t dst; 4102 void *ifp; 4103 u_int hv, rhv; 4104 4105 ifp = fin->fin_ifp; 4106 gre = NULL; 4107 dst = mapdst.s_addr; 4108 sflags = flags & NAT_TCPUDPICMP; 4109 4110 switch (p) 4111 { 4112 case IPPROTO_TCP : 4113 case IPPROTO_UDP : 4114 sport = htons(fin->fin_data[0]); 4115 dport = htons(fin->fin_data[1]); 4116 break; 4117 case IPPROTO_ICMP : 4118 sport = 0; 4119 dport = fin->fin_data[1]; 4120 break; 4121 default : 4122 sport = 0; 4123 dport = 0; 4124 break; 4125 } 4126 4127 4128 if ((flags & SI_WILDP) != 0) 4129 goto find_in_wild_ports; 4130 4131 rhv = NAT_HASH_FN(dst, dport, 0xffffffff); 4132 rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff); 4133 hv = rhv % softn->ipf_nat_table_sz; 4134 nat = softn->ipf_nat_table[1][hv]; 4135 /* TRACE dst, dport, src, sport, hv, nat */ 4136 4137 for (; nat; nat = nat->nat_hnext[1]) { 4138 if (nat->nat_ifps[0] != NULL) { 4139 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4140 continue; 4141 } 4142 4143 if (nat->nat_pr[0] != p) 4144 continue; 4145 4146 switch (nat->nat_dir) 4147 { 4148 case NAT_INBOUND : 4149 case NAT_DIVERTIN : 4150 if (nat->nat_v[0] != 4) 4151 continue; 4152 if (nat->nat_osrcaddr != src.s_addr || 4153 nat->nat_odstaddr != dst) 4154 continue; 4155 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4156 if (nat->nat_osport != sport) 4157 continue; 4158 if (nat->nat_odport != dport) 4159 continue; 4160 4161 } else if (p == IPPROTO_ICMP) { 4162 if (nat->nat_osport != dport) { 4163 continue; 4164 } 4165 } 4166 break; 4167 case NAT_DIVERTOUT : 4168 if (nat->nat_dlocal) 4169 continue; 4170 case NAT_OUTBOUND : 4171 if (nat->nat_v[1] != 4) 4172 continue; 4173 if (nat->nat_dlocal) 4174 continue; 4175 if (nat->nat_dlocal) 4176 continue; 4177 if (nat->nat_ndstaddr != src.s_addr || 4178 nat->nat_nsrcaddr != dst) 4179 continue; 4180 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4181 if (nat->nat_ndport != sport) 4182 continue; 4183 if (nat->nat_nsport != dport) 4184 continue; 4185 4186 } else if (p == IPPROTO_ICMP) { 4187 if (nat->nat_osport != dport) { 4188 continue; 4189 } 4190 } 4191 break; 4192 } 4193 4194 4195 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4196 ipn = nat->nat_ptr; 4197 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4198 if (ipf_proxy_match(fin, nat) != 0) 4199 continue; 4200 } 4201 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4202 nat->nat_ifps[0] = ifp; 4203 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4204 } 4205 return nat; 4206 } 4207 4208 /* 4209 * So if we didn't find it but there are wildcard members in the hash 4210 * table, go back and look for them. We do this search and update here 4211 * because it is modifying the NAT table and we want to do this only 4212 * for the first packet that matches. The exception, of course, is 4213 * for "dummy" (FI_IGNORE) lookups. 4214 */ 4215find_in_wild_ports: 4216 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4217 NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0); 4218 return NULL; 4219 } 4220 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4221 NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0); 4222 return NULL; 4223 } 4224 4225 RWLOCK_EXIT(&softc->ipf_nat); 4226 4227 hv = NAT_HASH_FN(dst, 0, 0xffffffff); 4228 hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz); 4229 WRITE_ENTER(&softc->ipf_nat); 4230 4231 nat = softn->ipf_nat_table[1][hv]; 4232 /* TRACE dst, src, hv, nat */ 4233 for (; nat; nat = nat->nat_hnext[1]) { 4234 if (nat->nat_ifps[0] != NULL) { 4235 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4236 continue; 4237 } 4238 4239 if (nat->nat_pr[0] != fin->fin_p) 4240 continue; 4241 4242 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4243 { 4244 case NAT_INBOUND : 4245 if (nat->nat_v[0] != 4) 4246 continue; 4247 if (nat->nat_osrcaddr != src.s_addr || 4248 nat->nat_odstaddr != dst) 4249 continue; 4250 break; 4251 case NAT_OUTBOUND : 4252 if (nat->nat_v[1] != 4) 4253 continue; 4254 if (nat->nat_ndstaddr != src.s_addr || 4255 nat->nat_nsrcaddr != dst) 4256 continue; 4257 break; 4258 } 4259 4260 nflags = nat->nat_flags; 4261 if (!(nflags & (NAT_TCPUDP|SI_WILDP))) 4262 continue; 4263 4264 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags, 4265 NAT_INBOUND) == 1) { 4266 if ((fin->fin_flx & FI_IGNORE) != 0) 4267 break; 4268 if ((nflags & SI_CLONE) != 0) { 4269 nat = ipf_nat_clone(fin, nat); 4270 if (nat == NULL) 4271 break; 4272 } else { 4273 MUTEX_ENTER(&softn->ipf_nat_new); 4274 softn->ipf_nat_stats.ns_wilds--; 4275 MUTEX_EXIT(&softn->ipf_nat_new); 4276 } 4277 4278 if (nat->nat_dir == NAT_INBOUND) { 4279 if (nat->nat_osport == 0) { 4280 nat->nat_osport = sport; 4281 nat->nat_nsport = sport; 4282 } 4283 if (nat->nat_odport == 0) { 4284 nat->nat_odport = dport; 4285 nat->nat_ndport = dport; 4286 } 4287 } else if (nat->nat_dir == NAT_OUTBOUND) { 4288 if (nat->nat_osport == 0) { 4289 nat->nat_osport = dport; 4290 nat->nat_nsport = dport; 4291 } 4292 if (nat->nat_odport == 0) { 4293 nat->nat_odport = sport; 4294 nat->nat_ndport = sport; 4295 } 4296 } 4297 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4298 nat->nat_ifps[0] = ifp; 4299 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4300 } 4301 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4302 ipf_nat_tabmove(softn, nat); 4303 break; 4304 } 4305 } 4306 4307 MUTEX_DOWNGRADE(&softc->ipf_nat); 4308 4309 if (nat == NULL) { 4310 NBUMPSIDE(0, ns_lookup_miss); 4311 } 4312 return nat; 4313} 4314 4315 4316/* ------------------------------------------------------------------------ */ 4317/* Function: ipf_nat_tabmove */ 4318/* Returns: Nil */ 4319/* Parameters: softn(I) - pointer to NAT context structure */ 4320/* nat(I) - pointer to NAT structure */ 4321/* Write Lock: ipf_nat */ 4322/* */ 4323/* This function is only called for TCP/UDP NAT table entries where the */ 4324/* original was placed in the table without hashing on the ports and we now */ 4325/* want to include hashing on port numbers. */ 4326/* ------------------------------------------------------------------------ */ 4327static void 4328ipf_nat_tabmove(softn, nat) 4329 ipf_nat_softc_t *softn; 4330 nat_t *nat; 4331{ 4332 u_int hv0, hv1, rhv0, rhv1; 4333 natstat_t *nsp; 4334 nat_t **natp; 4335 4336 if (nat->nat_flags & SI_CLONE) 4337 return; 4338 4339 nsp = &softn->ipf_nat_stats; 4340 /* 4341 * Remove the NAT entry from the old location 4342 */ 4343 if (nat->nat_hnext[0]) 4344 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 4345 *nat->nat_phnext[0] = nat->nat_hnext[0]; 4346 nsp->ns_side[0].ns_bucketlen[nat->nat_hv[0] % 4347 softn->ipf_nat_table_sz]--; 4348 4349 if (nat->nat_hnext[1]) 4350 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 4351 *nat->nat_phnext[1] = nat->nat_hnext[1]; 4352 nsp->ns_side[1].ns_bucketlen[nat->nat_hv[1] % 4353 softn->ipf_nat_table_sz]--; 4354 4355 /* 4356 * Add into the NAT table in the new position 4357 */ 4358 rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff); 4359 rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport, 4360 0xffffffff); 4361 rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff); 4362 rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport, 4363 0xffffffff); 4364 4365 hv0 = rhv0 % softn->ipf_nat_table_sz; 4366 hv1 = rhv1 % softn->ipf_nat_table_sz; 4367 4368 if (nat->nat_dir == NAT_INBOUND || nat->nat_dir == NAT_DIVERTIN) { 4369 u_int swap; 4370 4371 swap = hv0; 4372 hv0 = hv1; 4373 hv1 = swap; 4374 } 4375 4376 /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */ 4377 /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */ 4378 4379 nat->nat_hv[0] = rhv0; 4380 natp = &softn->ipf_nat_table[0][hv0]; 4381 if (*natp) 4382 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 4383 nat->nat_phnext[0] = natp; 4384 nat->nat_hnext[0] = *natp; 4385 *natp = nat; 4386 nsp->ns_side[0].ns_bucketlen[hv0]++; 4387 4388 nat->nat_hv[1] = rhv1; 4389 natp = &softn->ipf_nat_table[1][hv1]; 4390 if (*natp) 4391 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 4392 nat->nat_phnext[1] = natp; 4393 nat->nat_hnext[1] = *natp; 4394 *natp = nat; 4395 nsp->ns_side[1].ns_bucketlen[hv1]++; 4396} 4397 4398 4399/* ------------------------------------------------------------------------ */ 4400/* Function: ipf_nat_outlookup */ 4401/* Returns: nat_t* - NULL == no match, */ 4402/* else pointer to matching NAT entry */ 4403/* Parameters: fin(I) - pointer to packet information */ 4404/* flags(I) - NAT flags for this packet */ 4405/* p(I) - protocol for this packet */ 4406/* src(I) - source IP address */ 4407/* dst(I) - destination IP address */ 4408/* rw(I) - 1 == write lock on held, 0 == read lock. */ 4409/* */ 4410/* Lookup a nat entry based on the source 'real' ip address/port and */ 4411/* destination address/port. We use this lookup when sending a packet out, */ 4412/* we're looking for a table entry, based on the source address. */ 4413/* */ 4414/* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4415/* */ 4416/* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4417/* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4418/* */ 4419/* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4420/* the packet is of said protocol */ 4421/* ------------------------------------------------------------------------ */ 4422nat_t * 4423ipf_nat_outlookup(fin, flags, p, src, dst) 4424 fr_info_t *fin; 4425 u_int flags, p; 4426 struct in_addr src , dst; 4427{ 4428 ipf_main_softc_t *softc = fin->fin_main_soft; 4429 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4430 u_short sport, dport; 4431 u_int sflags; 4432 ipnat_t *ipn; 4433 nat_t *nat; 4434 void *ifp; 4435 u_int hv; 4436 4437 ifp = fin->fin_ifp; 4438 sflags = flags & IPN_TCPUDPICMP; 4439 4440 switch (p) 4441 { 4442 case IPPROTO_TCP : 4443 case IPPROTO_UDP : 4444 sport = htons(fin->fin_data[0]); 4445 dport = htons(fin->fin_data[1]); 4446 break; 4447 case IPPROTO_ICMP : 4448 sport = 0; 4449 dport = fin->fin_data[1]; 4450 break; 4451 default : 4452 sport = 0; 4453 dport = 0; 4454 break; 4455 } 4456 4457 if ((flags & SI_WILDP) != 0) 4458 goto find_out_wild_ports; 4459 4460 hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff); 4461 hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz); 4462 nat = softn->ipf_nat_table[0][hv]; 4463 4464 /* TRACE src, sport, dst, dport, hv, nat */ 4465 4466 for (; nat; nat = nat->nat_hnext[0]) { 4467 if (nat->nat_ifps[1] != NULL) { 4468 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4469 continue; 4470 } 4471 4472 if (nat->nat_pr[1] != p) 4473 continue; 4474 4475 switch (nat->nat_dir) 4476 { 4477 case NAT_INBOUND : 4478 case NAT_DIVERTIN : 4479 if (nat->nat_v[1] != 4) 4480 continue; 4481 if (nat->nat_ndstaddr != src.s_addr || 4482 nat->nat_nsrcaddr != dst.s_addr) 4483 continue; 4484 4485 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4486 if (nat->nat_ndport != sport) 4487 continue; 4488 if (nat->nat_nsport != dport) 4489 continue; 4490 4491 } else if (p == IPPROTO_ICMP) { 4492 if (nat->nat_osport != dport) { 4493 continue; 4494 } 4495 } 4496 break; 4497 case NAT_OUTBOUND : 4498 case NAT_DIVERTOUT : 4499 if (nat->nat_v[0] != 4) 4500 continue; 4501 if (nat->nat_osrcaddr != src.s_addr || 4502 nat->nat_odstaddr != dst.s_addr) 4503 continue; 4504 4505 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4506 if (nat->nat_odport != dport) 4507 continue; 4508 if (nat->nat_osport != sport) 4509 continue; 4510 4511 } else if (p == IPPROTO_ICMP) { 4512 if (nat->nat_osport != dport) { 4513 continue; 4514 } 4515 } 4516 break; 4517 } 4518 4519 ipn = nat->nat_ptr; 4520 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4521 if (ipf_proxy_match(fin, nat) != 0) 4522 continue; 4523 4524 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4525 nat->nat_ifps[1] = ifp; 4526 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4527 } 4528 return nat; 4529 } 4530 4531 /* 4532 * So if we didn't find it but there are wildcard members in the hash 4533 * table, go back and look for them. We do this search and update here 4534 * because it is modifying the NAT table and we want to do this only 4535 * for the first packet that matches. The exception, of course, is 4536 * for "dummy" (FI_IGNORE) lookups. 4537 */ 4538find_out_wild_ports: 4539 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4540 NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1); 4541 return NULL; 4542 } 4543 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4544 NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1); 4545 return NULL; 4546 } 4547 4548 RWLOCK_EXIT(&softc->ipf_nat); 4549 4550 hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff); 4551 hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz); 4552 4553 WRITE_ENTER(&softc->ipf_nat); 4554 4555 nat = softn->ipf_nat_table[0][hv]; 4556 for (; nat; nat = nat->nat_hnext[0]) { 4557 if (nat->nat_ifps[1] != NULL) { 4558 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4559 continue; 4560 } 4561 4562 if (nat->nat_pr[1] != fin->fin_p) 4563 continue; 4564 4565 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4566 { 4567 case NAT_INBOUND : 4568 if (nat->nat_v[1] != 4) 4569 continue; 4570 if (nat->nat_ndstaddr != src.s_addr || 4571 nat->nat_nsrcaddr != dst.s_addr) 4572 continue; 4573 break; 4574 case NAT_OUTBOUND : 4575 if (nat->nat_v[0] != 4) 4576 continue; 4577 if (nat->nat_osrcaddr != src.s_addr || 4578 nat->nat_odstaddr != dst.s_addr) 4579 continue; 4580 break; 4581 } 4582 4583 if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP))) 4584 continue; 4585 4586 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags, 4587 NAT_OUTBOUND) == 1) { 4588 if ((fin->fin_flx & FI_IGNORE) != 0) 4589 break; 4590 if ((nat->nat_flags & SI_CLONE) != 0) { 4591 nat = ipf_nat_clone(fin, nat); 4592 if (nat == NULL) 4593 break; 4594 } else { 4595 MUTEX_ENTER(&softn->ipf_nat_new); 4596 softn->ipf_nat_stats.ns_wilds--; 4597 MUTEX_EXIT(&softn->ipf_nat_new); 4598 } 4599 4600 if (nat->nat_dir == NAT_OUTBOUND) { 4601 if (nat->nat_osport == 0) { 4602 nat->nat_osport = sport; 4603 nat->nat_nsport = sport; 4604 } 4605 if (nat->nat_odport == 0) { 4606 nat->nat_odport = dport; 4607 nat->nat_ndport = dport; 4608 } 4609 } else if (nat->nat_dir == NAT_INBOUND) { 4610 if (nat->nat_osport == 0) { 4611 nat->nat_osport = dport; 4612 nat->nat_nsport = dport; 4613 } 4614 if (nat->nat_odport == 0) { 4615 nat->nat_odport = sport; 4616 nat->nat_ndport = sport; 4617 } 4618 } 4619 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4620 nat->nat_ifps[1] = ifp; 4621 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4622 } 4623 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4624 ipf_nat_tabmove(softn, nat); 4625 break; 4626 } 4627 } 4628 4629 MUTEX_DOWNGRADE(&softc->ipf_nat); 4630 4631 if (nat == NULL) { 4632 NBUMPSIDE(1, ns_lookup_miss); 4633 } 4634 return nat; 4635} 4636 4637 4638/* ------------------------------------------------------------------------ */ 4639/* Function: ipf_nat_lookupredir */ 4640/* Returns: nat_t* - NULL == no match, */ 4641/* else pointer to matching NAT entry */ 4642/* Parameters: np(I) - pointer to description of packet to find NAT table */ 4643/* entry for. */ 4644/* */ 4645/* Lookup the NAT tables to search for a matching redirect */ 4646/* The contents of natlookup_t should imitate those found in a packet that */ 4647/* would be translated - ie a packet coming in for RDR or going out for MAP.*/ 4648/* We can do the lookup in one of two ways, imitating an inbound or */ 4649/* outbound packet. By default we assume outbound, unless IPN_IN is set. */ 4650/* For IN, the fields are set as follows: */ 4651/* nl_real* = source information */ 4652/* nl_out* = destination information (translated) */ 4653/* For an out packet, the fields are set like this: */ 4654/* nl_in* = source information (untranslated) */ 4655/* nl_out* = destination information (translated) */ 4656/* ------------------------------------------------------------------------ */ 4657nat_t * 4658ipf_nat_lookupredir(np) 4659 natlookup_t *np; 4660{ 4661 fr_info_t fi; 4662 nat_t *nat; 4663 4664 bzero((char *)&fi, sizeof(fi)); 4665 if (np->nl_flags & IPN_IN) { 4666 fi.fin_data[0] = ntohs(np->nl_realport); 4667 fi.fin_data[1] = ntohs(np->nl_outport); 4668 } else { 4669 fi.fin_data[0] = ntohs(np->nl_inport); 4670 fi.fin_data[1] = ntohs(np->nl_outport); 4671 } 4672 if (np->nl_flags & IPN_TCP) 4673 fi.fin_p = IPPROTO_TCP; 4674 else if (np->nl_flags & IPN_UDP) 4675 fi.fin_p = IPPROTO_UDP; 4676 else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY)) 4677 fi.fin_p = IPPROTO_ICMP; 4678 4679 /* 4680 * We can do two sorts of lookups: 4681 * - IPN_IN: we have the `real' and `out' address, look for `in'. 4682 * - default: we have the `in' and `out' address, look for `real'. 4683 */ 4684 if (np->nl_flags & IPN_IN) { 4685 if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p, 4686 np->nl_realip, np->nl_outip))) { 4687 np->nl_inip = nat->nat_odstip; 4688 np->nl_inport = nat->nat_odport; 4689 } 4690 } else { 4691 /* 4692 * If nl_inip is non null, this is a lookup based on the real 4693 * ip address. Else, we use the fake. 4694 */ 4695 if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p, 4696 np->nl_inip, np->nl_outip))) { 4697 4698 if ((np->nl_flags & IPN_FINDFORWARD) != 0) { 4699 fr_info_t fin; 4700 bzero((char *)&fin, sizeof(fin)); 4701 fin.fin_p = nat->nat_pr[0]; 4702 fin.fin_data[0] = ntohs(nat->nat_ndport); 4703 fin.fin_data[1] = ntohs(nat->nat_nsport); 4704 if (ipf_nat_inlookup(&fin, np->nl_flags, 4705 fin.fin_p, nat->nat_ndstip, 4706 nat->nat_nsrcip) != NULL) { 4707 np->nl_flags &= ~IPN_FINDFORWARD; 4708 } 4709 } 4710 4711 np->nl_realip = nat->nat_odstip; 4712 np->nl_realport = nat->nat_odport; 4713 } 4714 } 4715 4716 return nat; 4717} 4718 4719 4720/* ------------------------------------------------------------------------ */ 4721/* Function: ipf_nat_match */ 4722/* Returns: int - 0 == no match, 1 == match */ 4723/* Parameters: fin(I) - pointer to packet information */ 4724/* np(I) - pointer to NAT rule */ 4725/* */ 4726/* Pull the matching of a packet against a NAT rule out of that complex */ 4727/* loop inside ipf_nat_checkin() and lay it out properly in its own function. */ 4728/* ------------------------------------------------------------------------ */ 4729static int 4730ipf_nat_match(fin, np) 4731 fr_info_t *fin; 4732 ipnat_t *np; 4733{ 4734 ipf_main_softc_t *softc = fin->fin_main_soft; 4735 frtuc_t *ft; 4736 int match; 4737 4738 match = 0; 4739 switch (np->in_osrcatype) 4740 { 4741 case FRI_NORMAL : 4742 match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr); 4743 break; 4744 case FRI_LOOKUP : 4745 match = (*np->in_osrcfunc)(softc, np->in_osrcptr, 4746 4, &fin->fin_saddr, fin->fin_plen); 4747 break; 4748 } 4749 match ^= ((np->in_flags & IPN_NOTSRC) != 0); 4750 if (match) 4751 return 0; 4752 4753 match = 0; 4754 switch (np->in_odstatype) 4755 { 4756 case FRI_NORMAL : 4757 match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr); 4758 break; 4759 case FRI_LOOKUP : 4760 match = (*np->in_odstfunc)(softc, np->in_odstptr, 4761 4, &fin->fin_daddr, fin->fin_plen); 4762 break; 4763 } 4764 4765 match ^= ((np->in_flags & IPN_NOTDST) != 0); 4766 if (match) 4767 return 0; 4768 4769 ft = &np->in_tuc; 4770 if (!(fin->fin_flx & FI_TCPUDP) || 4771 (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 4772 if (ft->ftu_scmp || ft->ftu_dcmp) 4773 return 0; 4774 return 1; 4775 } 4776 4777 return ipf_tcpudpchk(&fin->fin_fi, ft); 4778} 4779 4780 4781/* ------------------------------------------------------------------------ */ 4782/* Function: ipf_nat_update */ 4783/* Returns: Nil */ 4784/* Parameters: fin(I) - pointer to packet information */ 4785/* nat(I) - pointer to NAT structure */ 4786/* */ 4787/* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */ 4788/* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */ 4789/* */ 4790/* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */ 4791/* already be set. */ 4792/* ------------------------------------------------------------------------ */ 4793void 4794ipf_nat_update(fin, nat) 4795 fr_info_t *fin; 4796 nat_t *nat; 4797{ 4798 ipf_main_softc_t *softc = fin->fin_main_soft; 4799 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4800 ipftq_t *ifq, *ifq2; 4801 ipftqent_t *tqe; 4802 ipnat_t *np = nat->nat_ptr; 4803 4804 tqe = &nat->nat_tqe; 4805 ifq = tqe->tqe_ifq; 4806 4807 /* 4808 * We allow over-riding of NAT timeouts from NAT rules, even for 4809 * TCP, however, if it is TCP and there is no rule timeout set, 4810 * then do not update the timeout here. 4811 */ 4812 if (np != NULL) { 4813 np->in_bytes[fin->fin_rev] += fin->fin_plen; 4814 ifq2 = np->in_tqehead[fin->fin_rev]; 4815 } else { 4816 ifq2 = NULL; 4817 } 4818 4819 if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) { 4820 (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq, 4821 0, 2); 4822 } else { 4823 if (ifq2 == NULL) { 4824 if (nat->nat_pr[0] == IPPROTO_UDP) 4825 ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq : 4826 &softn->ipf_nat_udptq; 4827 else if (nat->nat_pr[0] == IPPROTO_ICMP || 4828 nat->nat_pr[0] == IPPROTO_ICMPV6) 4829 ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq: 4830 &softn->ipf_nat_icmptq; 4831 else 4832 ifq2 = &softn->ipf_nat_iptq; 4833 } 4834 4835 ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2); 4836 } 4837} 4838 4839 4840/* ------------------------------------------------------------------------ */ 4841/* Function: ipf_nat_checkout */ 4842/* Returns: int - -1 == packet failed NAT checks so block it, */ 4843/* 0 == no packet translation occurred, */ 4844/* 1 == packet was successfully translated. */ 4845/* Parameters: fin(I) - pointer to packet information */ 4846/* passp(I) - pointer to filtering result flags */ 4847/* */ 4848/* Check to see if an outcoming packet should be changed. ICMP packets are */ 4849/* first checked to see if they match an existing entry (if an error), */ 4850/* otherwise a search of the current NAT table is made. If neither results */ 4851/* in a match then a search for a matching NAT rule is made. Create a new */ 4852/* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 4853/* packet header(s) as required. */ 4854/* ------------------------------------------------------------------------ */ 4855int 4856ipf_nat_checkout(fin, passp) 4857 fr_info_t *fin; 4858 u_32_t *passp; 4859{ 4860 ipnat_t *np = NULL, *npnext; 4861 struct ifnet *ifp, *sifp; 4862 ipf_main_softc_t *softc; 4863 ipf_nat_softc_t *softn; 4864 icmphdr_t *icmp = NULL; 4865 tcphdr_t *tcp = NULL; 4866 int rval, natfailed; 4867 u_int nflags = 0; 4868 u_32_t ipa, iph; 4869 int natadd = 1; 4870 frentry_t *fr; 4871 nat_t *nat; 4872 4873 if (fin->fin_v == 6) { 4874#ifdef USE_INET6 4875 return ipf_nat6_checkout(fin, passp); 4876#else 4877 return 0; 4878#endif 4879 } 4880 4881 softc = fin->fin_main_soft; 4882 softn = softc->ipf_nat_soft; 4883 4884 if (softn->ipf_nat_lock != 0) 4885 return 0; 4886 if (softn->ipf_nat_stats.ns_rules == 0 && 4887 softn->ipf_nat_instances == NULL) 4888 return 0; 4889 4890 natfailed = 0; 4891 fr = fin->fin_fr; 4892 sifp = fin->fin_ifp; 4893 if (fr != NULL) { 4894 ifp = fr->fr_tifs[fin->fin_rev].fd_ptr; 4895 if ((ifp != NULL) && (ifp != (void *)-1)) 4896 fin->fin_ifp = ifp; 4897 } 4898 ifp = fin->fin_ifp; 4899 4900 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 4901 switch (fin->fin_p) 4902 { 4903 case IPPROTO_TCP : 4904 nflags = IPN_TCP; 4905 break; 4906 case IPPROTO_UDP : 4907 nflags = IPN_UDP; 4908 break; 4909 case IPPROTO_ICMP : 4910 icmp = fin->fin_dp; 4911 4912 /* 4913 * This is an incoming packet, so the destination is 4914 * the icmp_id and the source port equals 0 4915 */ 4916 if ((fin->fin_flx & FI_ICMPQUERY) != 0) 4917 nflags = IPN_ICMPQUERY; 4918 break; 4919 default : 4920 break; 4921 } 4922 4923 if ((nflags & IPN_TCPUDP)) 4924 tcp = fin->fin_dp; 4925 } 4926 4927 ipa = fin->fin_saddr; 4928 4929 READ_ENTER(&softc->ipf_nat); 4930 4931 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 4932 (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND))) 4933 /*EMPTY*/; 4934 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 4935 natadd = 0; 4936 else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH, 4937 (u_int)fin->fin_p, fin->fin_src, 4938 fin->fin_dst))) { 4939 nflags = nat->nat_flags; 4940 } else if (fin->fin_off == 0) { 4941 u_32_t hv, msk, nmsk = 0; 4942 4943 /* 4944 * If there is no current entry in the nat table for this IP#, 4945 * create one for it (if there is a matching rule). 4946 */ 4947maskloop: 4948 msk = softn->ipf_nat_map_active_masks[nmsk]; 4949 iph = ipa & msk; 4950 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz); 4951retry_roundrobin: 4952 for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) { 4953 npnext = np->in_mnext; 4954 if ((np->in_ifps[1] && (np->in_ifps[1] != ifp))) 4955 continue; 4956 if (np->in_v[0] != 4) 4957 continue; 4958 if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p)) 4959 continue; 4960 if ((np->in_flags & IPN_RF) && 4961 !(np->in_flags & nflags)) 4962 continue; 4963 if (np->in_flags & IPN_FILTER) { 4964 switch (ipf_nat_match(fin, np)) 4965 { 4966 case 0 : 4967 continue; 4968 case -1 : 4969 rval = -3; 4970 goto outmatchfail; 4971 case 1 : 4972 default : 4973 break; 4974 } 4975 } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr) 4976 continue; 4977 4978 if ((fr != NULL) && 4979 !ipf_matchtag(&np->in_tag, &fr->fr_nattag)) 4980 continue; 4981 4982 if (np->in_plabel != -1) { 4983 if (((np->in_flags & IPN_FILTER) == 0) && 4984 (np->in_odport != fin->fin_data[1])) 4985 continue; 4986 if (ipf_proxy_ok(fin, tcp, np) == 0) 4987 continue; 4988 } 4989 4990 if (np->in_flags & IPN_NO) { 4991 np->in_hits++; 4992 break; 4993 } 4994 MUTEX_ENTER(&softn->ipf_nat_new); 4995 /* 4996 * If we've matched a round-robin rule but it has 4997 * moved in the list since we got it, start over as 4998 * this is now no longer correct. 4999 */ 5000 if (npnext != np->in_mnext) { 5001 if ((np->in_flags & IPN_ROUNDR) != 0) { 5002 MUTEX_EXIT(&softn->ipf_nat_new); 5003 goto retry_roundrobin; 5004 } 5005 npnext = np->in_mnext; 5006 } 5007 5008 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND); 5009 MUTEX_EXIT(&softn->ipf_nat_new); 5010 if (nat != NULL) { 5011 natfailed = 0; 5012 break; 5013 } 5014 natfailed = -2; 5015 } 5016 if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) { 5017 nmsk++; 5018 goto maskloop; 5019 } 5020 } 5021 5022 if (nat != NULL) { 5023 rval = ipf_nat_out(fin, nat, natadd, nflags); 5024 if (rval == 1) { 5025 MUTEX_ENTER(&nat->nat_lock); 5026 ipf_nat_update(fin, nat); 5027 nat->nat_bytes[1] += fin->fin_plen; 5028 nat->nat_pkts[1]++; 5029 fin->fin_pktnum = nat->nat_pkts[1]; 5030 MUTEX_EXIT(&nat->nat_lock); 5031 } 5032 } else 5033 rval = natfailed; 5034outmatchfail: 5035 RWLOCK_EXIT(&softc->ipf_nat); 5036 5037 switch (rval) 5038 { 5039 case -3 : 5040 /* ipf_nat_match() failure */ 5041 /* FALLTHROUGH */ 5042 case -2 : 5043 /* retry_roundrobin loop failure */ 5044 /* FALLTHROUGH */ 5045 case -1 : 5046 /* proxy failure detected by ipf_nat_out() */ 5047 if (passp != NULL) { 5048 DT2(frb_natv4out, fr_info_t *, fin, int, rval); 5049 NBUMPSIDED(1, ns_drop); 5050 *passp = FR_BLOCK; 5051 fin->fin_reason = FRB_NATV4; 5052 } 5053 fin->fin_flx |= FI_BADNAT; 5054 NBUMPSIDED(1, ns_badnat); 5055 rval = -1; /* We only return -1 on error. */ 5056 break; 5057 case 0 : 5058 NBUMPSIDE(1, ns_ignored); 5059 break; 5060 case 1 : 5061 NBUMPSIDE(1, ns_translated); 5062 break; 5063 } 5064 fin->fin_ifp = sifp; 5065 return rval; 5066} 5067 5068/* ------------------------------------------------------------------------ */ 5069/* Function: ipf_nat_out */ 5070/* Returns: int - -1 == packet failed NAT checks so block it, */ 5071/* 1 == packet was successfully translated. */ 5072/* Parameters: fin(I) - pointer to packet information */ 5073/* nat(I) - pointer to NAT structure */ 5074/* natadd(I) - flag indicating if it is safe to add frag cache */ 5075/* nflags(I) - NAT flags set for this packet */ 5076/* */ 5077/* Translate a packet coming "out" on an interface. */ 5078/* ------------------------------------------------------------------------ */ 5079int 5080ipf_nat_out(fin, nat, natadd, nflags) 5081 fr_info_t *fin; 5082 nat_t *nat; 5083 int natadd; 5084 u_32_t nflags; 5085{ 5086 ipf_main_softc_t *softc = fin->fin_main_soft; 5087 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5088 icmphdr_t *icmp; 5089 tcphdr_t *tcp; 5090 ipnat_t *np; 5091 int skip; 5092 int i; 5093 5094 tcp = NULL; 5095 icmp = NULL; 5096 np = nat->nat_ptr; 5097 5098 if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL)) 5099 (void) ipf_frag_natnew(softc, fin, 0, nat); 5100 5101 /* 5102 * Fix up checksums, not by recalculating them, but 5103 * simply computing adjustments. 5104 * This is only done for STREAMS based IP implementations where the 5105 * checksum has already been calculated by IP. In all other cases, 5106 * IPFilter is called before the checksum needs calculating so there 5107 * is no call to modify whatever is in the header now. 5108 */ 5109 if (nflags == IPN_ICMPERR) { 5110 u_32_t s1, s2, sumd, msumd; 5111 5112 s1 = LONG_SUM(ntohl(fin->fin_saddr)); 5113 if (nat->nat_dir == NAT_OUTBOUND) { 5114 s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 5115 } else { 5116 s2 = LONG_SUM(ntohl(nat->nat_odstaddr)); 5117 } 5118 CALC_SUMD(s1, s2, sumd); 5119 msumd = sumd; 5120 5121 s1 = LONG_SUM(ntohl(fin->fin_daddr)); 5122 if (nat->nat_dir == NAT_OUTBOUND) { 5123 s2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 5124 } else { 5125 s2 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 5126 } 5127 CALC_SUMD(s1, s2, sumd); 5128 msumd += sumd; 5129 5130 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0); 5131 } 5132#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5133 defined(linux) || defined(BRIDGE_IPF) || defined(__FreeBSD__) 5134 else { 5135 /* 5136 * Strictly speaking, this isn't necessary on BSD 5137 * kernels because they do checksum calculation after 5138 * this code has run BUT if ipfilter is being used 5139 * to do NAT as a bridge, that code doesn't exist. 5140 */ 5141 switch (nat->nat_dir) 5142 { 5143 case NAT_OUTBOUND : 5144 ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART, 5145 &fin->fin_ip->ip_sum, 5146 nat->nat_ipsumd, 0); 5147 break; 5148 5149 case NAT_INBOUND : 5150 ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART, 5151 &fin->fin_ip->ip_sum, 5152 nat->nat_ipsumd, 0); 5153 break; 5154 5155 default : 5156 break; 5157 } 5158 } 5159#endif 5160 5161 /* 5162 * Address assignment is after the checksum modification because 5163 * we are using the address in the packet for determining the 5164 * correct checksum offset (the ICMP error could be coming from 5165 * anyone...) 5166 */ 5167 switch (nat->nat_dir) 5168 { 5169 case NAT_OUTBOUND : 5170 fin->fin_ip->ip_src = nat->nat_nsrcip; 5171 fin->fin_saddr = nat->nat_nsrcaddr; 5172 fin->fin_ip->ip_dst = nat->nat_ndstip; 5173 fin->fin_daddr = nat->nat_ndstaddr; 5174 break; 5175 5176 case NAT_INBOUND : 5177 fin->fin_ip->ip_src = nat->nat_odstip; 5178 fin->fin_saddr = nat->nat_ndstaddr; 5179 fin->fin_ip->ip_dst = nat->nat_osrcip; 5180 fin->fin_daddr = nat->nat_nsrcaddr; 5181 break; 5182 5183 case NAT_DIVERTIN : 5184 { 5185 mb_t *m; 5186 5187 skip = ipf_nat_decap(fin, nat); 5188 if (skip <= 0) { 5189 NBUMPSIDED(1, ns_decap_fail); 5190 return -1; 5191 } 5192 5193 m = fin->fin_m; 5194 5195#if defined(MENTAT) && defined(_KERNEL) 5196 m->b_rptr += skip; 5197#else 5198 m->m_data += skip; 5199 m->m_len -= skip; 5200 5201# ifdef M_PKTHDR 5202 if (m->m_flags & M_PKTHDR) 5203 m->m_pkthdr.len -= skip; 5204# endif 5205#endif 5206 5207 MUTEX_ENTER(&nat->nat_lock); 5208 ipf_nat_update(fin, nat); 5209 MUTEX_EXIT(&nat->nat_lock); 5210 fin->fin_flx |= FI_NATED; 5211 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5212 fin->fin_nattag = &np->in_tag; 5213 return 1; 5214 /* NOTREACHED */ 5215 } 5216 5217 case NAT_DIVERTOUT : 5218 { 5219 u_32_t s1, s2, sumd; 5220 udphdr_t *uh; 5221 ip_t *ip; 5222 mb_t *m; 5223 5224 m = M_DUP(np->in_divmp); 5225 if (m == NULL) { 5226 NBUMPSIDED(1, ns_divert_dup); 5227 return -1; 5228 } 5229 5230 ip = MTOD(m, ip_t *); 5231 ip->ip_id = htons(ipf_nextipid(fin)); 5232 s2 = ntohs(ip->ip_id); 5233 5234 s1 = ip->ip_len; 5235 ip->ip_len = ntohs(ip->ip_len); 5236 ip->ip_len += fin->fin_plen; 5237 ip->ip_len = htons(ip->ip_len); 5238 s2 += ntohs(ip->ip_len); 5239 CALC_SUMD(s1, s2, sumd); 5240 5241 uh = (udphdr_t *)(ip + 1); 5242 uh->uh_ulen += fin->fin_plen; 5243 uh->uh_ulen = htons(uh->uh_ulen); 5244#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5245 defined(linux) || defined(BRIDGE_IPF) || defined(__FreeBSD__) 5246 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5247#endif 5248 5249 PREP_MB_T(fin, m); 5250 5251 fin->fin_src = ip->ip_src; 5252 fin->fin_dst = ip->ip_dst; 5253 fin->fin_ip = ip; 5254 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5255 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5256 5257 nflags &= ~IPN_TCPUDPICMP; 5258 5259 break; 5260 } 5261 5262 default : 5263 break; 5264 } 5265 5266 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5267 u_short *csump; 5268 5269 if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) { 5270 tcp = fin->fin_dp; 5271 5272 switch (nat->nat_dir) 5273 { 5274 case NAT_OUTBOUND : 5275 tcp->th_sport = nat->nat_nsport; 5276 fin->fin_data[0] = ntohs(nat->nat_nsport); 5277 tcp->th_dport = nat->nat_ndport; 5278 fin->fin_data[1] = ntohs(nat->nat_ndport); 5279 break; 5280 5281 case NAT_INBOUND : 5282 tcp->th_sport = nat->nat_odport; 5283 fin->fin_data[0] = ntohs(nat->nat_odport); 5284 tcp->th_dport = nat->nat_osport; 5285 fin->fin_data[1] = ntohs(nat->nat_osport); 5286 break; 5287 } 5288 } 5289 5290 if ((nat->nat_nsport != 0) && (nflags & IPN_ICMPQUERY)) { 5291 icmp = fin->fin_dp; 5292 icmp->icmp_id = nat->nat_nicmpid; 5293 } 5294 5295 csump = ipf_nat_proto(fin, nat, nflags); 5296 5297 /* 5298 * The above comments do not hold for layer 4 (or higher) 5299 * checksums... 5300 */ 5301 if (csump != NULL) { 5302 if (nat->nat_dir == NAT_OUTBOUND) 5303 ipf_fix_outcksum(fin->fin_cksum, csump, 5304 nat->nat_sumd[0], 5305 nat->nat_sumd[1] + 5306 fin->fin_dlen); 5307 else 5308 ipf_fix_incksum(fin->fin_cksum, csump, 5309 nat->nat_sumd[0], 5310 nat->nat_sumd[1] + 5311 fin->fin_dlen); 5312 } 5313 } 5314 5315 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5316 /* ------------------------------------------------------------- */ 5317 /* A few quick notes: */ 5318 /* Following are test conditions prior to calling the */ 5319 /* ipf_proxy_check routine. */ 5320 /* */ 5321 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5322 /* with a redirect rule, we attempt to match the packet's */ 5323 /* source port against in_dport, otherwise we'd compare the */ 5324 /* packet's destination. */ 5325 /* ------------------------------------------------------------- */ 5326 if ((np != NULL) && (np->in_apr != NULL)) { 5327 i = ipf_proxy_check(fin, nat); 5328 if (i == 0) { 5329 i = 1; 5330 } else if (i == -1) { 5331 NBUMPSIDED(1, ns_ipf_proxy_fail); 5332 } 5333 } else { 5334 i = 1; 5335 } 5336 fin->fin_flx |= FI_NATED; 5337 return i; 5338} 5339 5340 5341/* ------------------------------------------------------------------------ */ 5342/* Function: ipf_nat_checkin */ 5343/* Returns: int - -1 == packet failed NAT checks so block it, */ 5344/* 0 == no packet translation occurred, */ 5345/* 1 == packet was successfully translated. */ 5346/* Parameters: fin(I) - pointer to packet information */ 5347/* passp(I) - pointer to filtering result flags */ 5348/* */ 5349/* Check to see if an incoming packet should be changed. ICMP packets are */ 5350/* first checked to see if they match an existing entry (if an error), */ 5351/* otherwise a search of the current NAT table is made. If neither results */ 5352/* in a match then a search for a matching NAT rule is made. Create a new */ 5353/* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 5354/* packet header(s) as required. */ 5355/* ------------------------------------------------------------------------ */ 5356int 5357ipf_nat_checkin(fin, passp) 5358 fr_info_t *fin; 5359 u_32_t *passp; 5360{ 5361 ipf_main_softc_t *softc; 5362 ipf_nat_softc_t *softn; 5363 u_int nflags, natadd; 5364 ipnat_t *np, *npnext; 5365 int rval, natfailed; 5366 struct ifnet *ifp; 5367 struct in_addr in; 5368 icmphdr_t *icmp; 5369 tcphdr_t *tcp; 5370 u_short dport; 5371 nat_t *nat; 5372 u_32_t iph; 5373 5374 softc = fin->fin_main_soft; 5375 softn = softc->ipf_nat_soft; 5376 5377 if (softn->ipf_nat_lock != 0) 5378 return 0; 5379 if (softn->ipf_nat_stats.ns_rules == 0 && 5380 softn->ipf_nat_instances == NULL) 5381 return 0; 5382 5383 tcp = NULL; 5384 icmp = NULL; 5385 dport = 0; 5386 natadd = 1; 5387 nflags = 0; 5388 natfailed = 0; 5389 ifp = fin->fin_ifp; 5390 5391 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5392 switch (fin->fin_p) 5393 { 5394 case IPPROTO_TCP : 5395 nflags = IPN_TCP; 5396 break; 5397 case IPPROTO_UDP : 5398 nflags = IPN_UDP; 5399 break; 5400 case IPPROTO_ICMP : 5401 icmp = fin->fin_dp; 5402 5403 /* 5404 * This is an incoming packet, so the destination is 5405 * the icmp_id and the source port equals 0 5406 */ 5407 if ((fin->fin_flx & FI_ICMPQUERY) != 0) { 5408 nflags = IPN_ICMPQUERY; 5409 dport = icmp->icmp_id; 5410 } break; 5411 default : 5412 break; 5413 } 5414 5415 if ((nflags & IPN_TCPUDP)) { 5416 tcp = fin->fin_dp; 5417 dport = fin->fin_data[1]; 5418 } 5419 } 5420 5421 in = fin->fin_dst; 5422 5423 READ_ENTER(&softc->ipf_nat); 5424 5425 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 5426 (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND))) 5427 /*EMPTY*/; 5428 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 5429 natadd = 0; 5430 else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH, 5431 (u_int)fin->fin_p, 5432 fin->fin_src, in))) { 5433 nflags = nat->nat_flags; 5434 } else if (fin->fin_off == 0) { 5435 u_32_t hv, msk, rmsk = 0; 5436 5437 /* 5438 * If there is no current entry in the nat table for this IP#, 5439 * create one for it (if there is a matching rule). 5440 */ 5441maskloop: 5442 msk = softn->ipf_nat_rdr_active_masks[rmsk]; 5443 iph = in.s_addr & msk; 5444 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz); 5445retry_roundrobin: 5446 /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */ 5447 for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) { 5448 npnext = np->in_rnext; 5449 if (np->in_ifps[0] && (np->in_ifps[0] != ifp)) 5450 continue; 5451 if (np->in_v[0] != 4) 5452 continue; 5453 if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p)) 5454 continue; 5455 if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags)) 5456 continue; 5457 if (np->in_flags & IPN_FILTER) { 5458 switch (ipf_nat_match(fin, np)) 5459 { 5460 case 0 : 5461 continue; 5462 case -1 : 5463 rval = -3; 5464 goto inmatchfail; 5465 case 1 : 5466 default : 5467 break; 5468 } 5469 } else { 5470 if ((in.s_addr & np->in_odstmsk) != 5471 np->in_odstaddr) 5472 continue; 5473 if (np->in_odport && 5474 ((np->in_dtop < dport) || 5475 (dport < np->in_odport))) 5476 continue; 5477 } 5478 5479 if (np->in_plabel != -1) { 5480 if (!ipf_proxy_ok(fin, tcp, np)) { 5481 continue; 5482 } 5483 } 5484 5485 if (np->in_flags & IPN_NO) { 5486 np->in_hits++; 5487 break; 5488 } 5489 5490 MUTEX_ENTER(&softn->ipf_nat_new); 5491 /* 5492 * If we've matched a round-robin rule but it has 5493 * moved in the list since we got it, start over as 5494 * this is now no longer correct. 5495 */ 5496 if (npnext != np->in_rnext) { 5497 if ((np->in_flags & IPN_ROUNDR) != 0) { 5498 MUTEX_EXIT(&softn->ipf_nat_new); 5499 goto retry_roundrobin; 5500 } 5501 npnext = np->in_rnext; 5502 } 5503 5504 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND); 5505 MUTEX_EXIT(&softn->ipf_nat_new); 5506 if (nat != NULL) { 5507 natfailed = 0; 5508 break; 5509 } 5510 natfailed = -2; 5511 } 5512 if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) { 5513 rmsk++; 5514 goto maskloop; 5515 } 5516 } 5517 5518 if (nat != NULL) { 5519 rval = ipf_nat_in(fin, nat, natadd, nflags); 5520 if (rval == 1) { 5521 MUTEX_ENTER(&nat->nat_lock); 5522 ipf_nat_update(fin, nat); 5523 nat->nat_bytes[0] += fin->fin_plen; 5524 nat->nat_pkts[0]++; 5525 fin->fin_pktnum = nat->nat_pkts[0]; 5526 MUTEX_EXIT(&nat->nat_lock); 5527 } 5528 } else 5529 rval = natfailed; 5530inmatchfail: 5531 RWLOCK_EXIT(&softc->ipf_nat); 5532 5533 switch (rval) 5534 { 5535 case -3 : 5536 /* ipf_nat_match() failure */ 5537 /* FALLTHROUGH */ 5538 case -2 : 5539 /* retry_roundrobin loop failure */ 5540 /* FALLTHROUGH */ 5541 case -1 : 5542 /* proxy failure detected by ipf_nat_in() */ 5543 if (passp != NULL) { 5544 DT2(frb_natv4in, fr_info_t *, fin, int, rval); 5545 NBUMPSIDED(0, ns_drop); 5546 *passp = FR_BLOCK; 5547 fin->fin_reason = FRB_NATV4; 5548 } 5549 fin->fin_flx |= FI_BADNAT; 5550 NBUMPSIDED(0, ns_badnat); 5551 rval = -1; /* We only return -1 on error. */ 5552 break; 5553 case 0 : 5554 NBUMPSIDE(0, ns_ignored); 5555 break; 5556 case 1 : 5557 NBUMPSIDE(0, ns_translated); 5558 break; 5559 } 5560 return rval; 5561} 5562 5563 5564/* ------------------------------------------------------------------------ */ 5565/* Function: ipf_nat_in */ 5566/* Returns: int - -1 == packet failed NAT checks so block it, */ 5567/* 1 == packet was successfully translated. */ 5568/* Parameters: fin(I) - pointer to packet information */ 5569/* nat(I) - pointer to NAT structure */ 5570/* natadd(I) - flag indicating if it is safe to add frag cache */ 5571/* nflags(I) - NAT flags set for this packet */ 5572/* Locks Held: ipf_nat(READ) */ 5573/* */ 5574/* Translate a packet coming "in" on an interface. */ 5575/* ------------------------------------------------------------------------ */ 5576int 5577ipf_nat_in(fin, nat, natadd, nflags) 5578 fr_info_t *fin; 5579 nat_t *nat; 5580 int natadd; 5581 u_32_t nflags; 5582{ 5583 ipf_main_softc_t *softc = fin->fin_main_soft; 5584 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5585 u_32_t sumd, ipsumd, sum1, sum2; 5586 icmphdr_t *icmp; 5587 tcphdr_t *tcp; 5588 ipnat_t *np; 5589 int skip; 5590 int i; 5591 5592 tcp = NULL; 5593 np = nat->nat_ptr; 5594 fin->fin_fr = nat->nat_fr; 5595 5596 if (np != NULL) { 5597 if ((natadd != 0) && (fin->fin_flx & FI_FRAG)) 5598 (void) ipf_frag_natnew(softc, fin, 0, nat); 5599 5600 /* ------------------------------------------------------------- */ 5601 /* A few quick notes: */ 5602 /* Following are test conditions prior to calling the */ 5603 /* ipf_proxy_check routine. */ 5604 /* */ 5605 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5606 /* with a map rule, we attempt to match the packet's */ 5607 /* source port against in_dport, otherwise we'd compare the */ 5608 /* packet's destination. */ 5609 /* ------------------------------------------------------------- */ 5610 if (np->in_apr != NULL) { 5611 i = ipf_proxy_check(fin, nat); 5612 if (i == -1) { 5613 NBUMPSIDED(0, ns_ipf_proxy_fail); 5614 return -1; 5615 } 5616 } 5617 } 5618 5619 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5620 5621 ipsumd = nat->nat_ipsumd; 5622 /* 5623 * Fix up checksums, not by recalculating them, but 5624 * simply computing adjustments. 5625 * Why only do this for some platforms on inbound packets ? 5626 * Because for those that it is done, IP processing is yet to happen 5627 * and so the IPv4 header checksum has not yet been evaluated. 5628 * Perhaps it should always be done for the benefit of things like 5629 * fast forwarding (so that it doesn't need to be recomputed) but with 5630 * header checksum offloading, perhaps it is a moot point. 5631 */ 5632 5633 switch (nat->nat_dir) 5634 { 5635 case NAT_INBOUND : 5636 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5637 fin->fin_ip->ip_src = nat->nat_nsrcip; 5638 fin->fin_saddr = nat->nat_nsrcaddr; 5639 } else { 5640 sum1 = nat->nat_osrcaddr; 5641 sum2 = nat->nat_nsrcaddr; 5642 CALC_SUMD(sum1, sum2, sumd); 5643 ipsumd -= sumd; 5644 } 5645 fin->fin_ip->ip_dst = nat->nat_ndstip; 5646 fin->fin_daddr = nat->nat_ndstaddr; 5647#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5648 defined(__osf__) || defined(linux) 5649 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5650#endif 5651 break; 5652 5653 case NAT_OUTBOUND : 5654 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5655 fin->fin_ip->ip_src = nat->nat_odstip; 5656 fin->fin_saddr = nat->nat_odstaddr; 5657 } else { 5658 sum1 = nat->nat_odstaddr; 5659 sum2 = nat->nat_ndstaddr; 5660 CALC_SUMD(sum1, sum2, sumd); 5661 ipsumd -= sumd; 5662 } 5663 fin->fin_ip->ip_dst = nat->nat_osrcip; 5664 fin->fin_daddr = nat->nat_osrcaddr; 5665#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5666 defined(__osf__) || defined(linux) 5667 ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5668#endif 5669 break; 5670 5671 case NAT_DIVERTIN : 5672 { 5673 udphdr_t *uh; 5674 ip_t *ip; 5675 mb_t *m; 5676 5677 m = M_DUP(np->in_divmp); 5678 if (m == NULL) { 5679 NBUMPSIDED(0, ns_divert_dup); 5680 return -1; 5681 } 5682 5683 ip = MTOD(m, ip_t *); 5684 ip->ip_id = htons(ipf_nextipid(fin)); 5685 sum1 = ntohs(ip->ip_len); 5686 ip->ip_len = ntohs(ip->ip_len); 5687 ip->ip_len += fin->fin_plen; 5688 ip->ip_len = htons(ip->ip_len); 5689 5690 uh = (udphdr_t *)(ip + 1); 5691 uh->uh_ulen += fin->fin_plen; 5692 uh->uh_ulen = htons(uh->uh_ulen); 5693 5694 sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len); 5695 sum2 += ntohs(ip->ip_off) & IP_DF; 5696 CALC_SUMD(sum1, sum2, sumd); 5697 5698#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5699 defined(__osf__) || defined(linux) 5700 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5701#endif 5702 PREP_MB_T(fin, m); 5703 5704 fin->fin_ip = ip; 5705 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */ 5706 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */ 5707 5708 nflags &= ~IPN_TCPUDPICMP; 5709 5710 break; 5711 } 5712 5713 case NAT_DIVERTOUT : 5714 { 5715 mb_t *m; 5716 5717 skip = ipf_nat_decap(fin, nat); 5718 if (skip <= 0) { 5719 NBUMPSIDED(0, ns_decap_fail); 5720 return -1; 5721 } 5722 5723 m = fin->fin_m; 5724 5725#if defined(MENTAT) && defined(_KERNEL) 5726 m->b_rptr += skip; 5727#else 5728 m->m_data += skip; 5729 m->m_len -= skip; 5730 5731# ifdef M_PKTHDR 5732 if (m->m_flags & M_PKTHDR) 5733 m->m_pkthdr.len -= skip; 5734# endif 5735#endif 5736 5737 ipf_nat_update(fin, nat); 5738 nflags &= ~IPN_TCPUDPICMP; 5739 fin->fin_flx |= FI_NATED; 5740 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5741 fin->fin_nattag = &np->in_tag; 5742 return 1; 5743 /* NOTREACHED */ 5744 } 5745 } 5746 if (nflags & IPN_TCPUDP) 5747 tcp = fin->fin_dp; 5748 5749 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5750 u_short *csump; 5751 5752 if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) { 5753 switch (nat->nat_dir) 5754 { 5755 case NAT_INBOUND : 5756 tcp->th_sport = nat->nat_nsport; 5757 fin->fin_data[0] = ntohs(nat->nat_nsport); 5758 tcp->th_dport = nat->nat_ndport; 5759 fin->fin_data[1] = ntohs(nat->nat_ndport); 5760 break; 5761 5762 case NAT_OUTBOUND : 5763 tcp->th_sport = nat->nat_odport; 5764 fin->fin_data[0] = ntohs(nat->nat_odport); 5765 tcp->th_dport = nat->nat_osport; 5766 fin->fin_data[1] = ntohs(nat->nat_osport); 5767 break; 5768 } 5769 } 5770 5771 5772 if ((nat->nat_odport != 0) && (nflags & IPN_ICMPQUERY)) { 5773 icmp = fin->fin_dp; 5774 5775 icmp->icmp_id = nat->nat_nicmpid; 5776 } 5777 5778 csump = ipf_nat_proto(fin, nat, nflags); 5779 5780 /* 5781 * The above comments do not hold for layer 4 (or higher) 5782 * checksums... 5783 */ 5784 if (csump != NULL) { 5785 if (nat->nat_dir == NAT_OUTBOUND) 5786 ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0); 5787 else 5788 ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0); 5789 } 5790 } 5791 5792 fin->fin_flx |= FI_NATED; 5793 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5794 fin->fin_nattag = &np->in_tag; 5795 return 1; 5796} 5797 5798 5799/* ------------------------------------------------------------------------ */ 5800/* Function: ipf_nat_proto */ 5801/* Returns: u_short* - pointer to transport header checksum to update, */ 5802/* NULL if the transport protocol is not recognised */ 5803/* as needing a checksum update. */ 5804/* Parameters: fin(I) - pointer to packet information */ 5805/* nat(I) - pointer to NAT structure */ 5806/* nflags(I) - NAT flags set for this packet */ 5807/* */ 5808/* Return the pointer to the checksum field for each protocol so understood.*/ 5809/* If support for making other changes to a protocol header is required, */ 5810/* that is not strictly 'address' translation, such as clamping the MSS in */ 5811/* TCP down to a specific value, then do it from here. */ 5812/* ------------------------------------------------------------------------ */ 5813u_short * 5814ipf_nat_proto(fin, nat, nflags) 5815 fr_info_t *fin; 5816 nat_t *nat; 5817 u_int nflags; 5818{ 5819 icmphdr_t *icmp; 5820 u_short *csump; 5821 tcphdr_t *tcp; 5822 udphdr_t *udp; 5823 5824 csump = NULL; 5825 if (fin->fin_out == 0) { 5826 fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND); 5827 } else { 5828 fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0); 5829 } 5830 5831 switch (fin->fin_p) 5832 { 5833 case IPPROTO_TCP : 5834 tcp = fin->fin_dp; 5835 5836 if ((nflags & IPN_TCP) != 0) 5837 csump = &tcp->th_sum; 5838 5839 /* 5840 * Do a MSS CLAMPING on a SYN packet, 5841 * only deal IPv4 for now. 5842 */ 5843 if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0) 5844 ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump); 5845 5846 break; 5847 5848 case IPPROTO_UDP : 5849 udp = fin->fin_dp; 5850 5851 if ((nflags & IPN_UDP) != 0) { 5852 if (udp->uh_sum != 0) 5853 csump = &udp->uh_sum; 5854 } 5855 break; 5856 5857 case IPPROTO_ICMP : 5858 icmp = fin->fin_dp; 5859 5860 if ((nflags & IPN_ICMPQUERY) != 0) { 5861 if (icmp->icmp_cksum != 0) 5862 csump = &icmp->icmp_cksum; 5863 } 5864 break; 5865 5866#ifdef USE_INET6 5867 case IPPROTO_ICMPV6 : 5868 { 5869 struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp; 5870 5871 icmp6 = fin->fin_dp; 5872 5873 if ((nflags & IPN_ICMPQUERY) != 0) { 5874 if (icmp6->icmp6_cksum != 0) 5875 csump = &icmp6->icmp6_cksum; 5876 } 5877 break; 5878 } 5879#endif 5880 } 5881 return csump; 5882} 5883 5884 5885/* ------------------------------------------------------------------------ */ 5886/* Function: ipf_nat_expire */ 5887/* Returns: Nil */ 5888/* Parameters: softc(I) - pointer to soft context main structure */ 5889/* */ 5890/* Check all of the timeout queues for entries at the top which need to be */ 5891/* expired. */ 5892/* ------------------------------------------------------------------------ */ 5893void 5894ipf_nat_expire(softc) 5895 ipf_main_softc_t *softc; 5896{ 5897 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5898 ipftq_t *ifq, *ifqnext; 5899 ipftqent_t *tqe, *tqn; 5900 int i; 5901 SPL_INT(s); 5902 5903 SPL_NET(s); 5904 WRITE_ENTER(&softc->ipf_nat); 5905 for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL; 5906 ifq = ifq->ifq_next) { 5907 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5908 if (tqe->tqe_die > softc->ipf_ticks) 5909 break; 5910 tqn = tqe->tqe_next; 5911 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5912 } 5913 } 5914 5915 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) { 5916 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5917 if (tqe->tqe_die > softc->ipf_ticks) 5918 break; 5919 tqn = tqe->tqe_next; 5920 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5921 } 5922 } 5923 5924 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 5925 ifqnext = ifq->ifq_next; 5926 5927 if (((ifq->ifq_flags & IFQF_DELETE) != 0) && 5928 (ifq->ifq_ref == 0)) { 5929 ipf_freetimeoutqueue(softc, ifq); 5930 } 5931 } 5932 5933 if (softn->ipf_nat_doflush != 0) { 5934 ipf_nat_extraflush(softc, softn, 2); 5935 softn->ipf_nat_doflush = 0; 5936 } 5937 5938 RWLOCK_EXIT(&softc->ipf_nat); 5939 SPL_X(s); 5940} 5941 5942 5943/* ------------------------------------------------------------------------ */ 5944/* Function: ipf_nat_sync */ 5945/* Returns: Nil */ 5946/* Parameters: softc(I) - pointer to soft context main structure */ 5947/* ifp(I) - pointer to network interface */ 5948/* */ 5949/* Walk through all of the currently active NAT sessions, looking for those */ 5950/* which need to have their translated address updated. */ 5951/* ------------------------------------------------------------------------ */ 5952void 5953ipf_nat_sync(softc, ifp) 5954 ipf_main_softc_t *softc; 5955 void *ifp; 5956{ 5957 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5958 u_32_t sum1, sum2, sumd; 5959 i6addr_t in; 5960 ipnat_t *n; 5961 nat_t *nat; 5962 void *ifp2; 5963 int idx; 5964 SPL_INT(s); 5965 5966 if (softc->ipf_running <= 0) 5967 return; 5968 5969 /* 5970 * Change IP addresses for NAT sessions for any protocol except TCP 5971 * since it will break the TCP connection anyway. The only rules 5972 * which will get changed are those which are "map ... -> 0/32", 5973 * where the rule specifies the address is taken from the interface. 5974 */ 5975 SPL_NET(s); 5976 WRITE_ENTER(&softc->ipf_nat); 5977 5978 if (softc->ipf_running <= 0) { 5979 RWLOCK_EXIT(&softc->ipf_nat); 5980 return; 5981 } 5982 5983 for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) { 5984 if ((nat->nat_flags & IPN_TCP) != 0) 5985 continue; 5986 5987 n = nat->nat_ptr; 5988 if (n != NULL) { 5989 if (n->in_v[1] == 4) { 5990 if (n->in_redir & NAT_MAP) { 5991 if ((n->in_nsrcaddr != 0) || 5992 (n->in_nsrcmsk != 0xffffffff)) 5993 continue; 5994 } else if (n->in_redir & NAT_REDIRECT) { 5995 if ((n->in_ndstaddr != 0) || 5996 (n->in_ndstmsk != 0xffffffff)) 5997 continue; 5998 } 5999 } 6000#ifdef USE_INET6 6001 if (n->in_v[1] == 4) { 6002 if (n->in_redir & NAT_MAP) { 6003 if (!IP6_ISZERO(&n->in_nsrcaddr) || 6004 !IP6_ISONES(&n->in_nsrcmsk)) 6005 continue; 6006 } else if (n->in_redir & NAT_REDIRECT) { 6007 if (!IP6_ISZERO(&n->in_ndstaddr) || 6008 !IP6_ISONES(&n->in_ndstmsk)) 6009 continue; 6010 } 6011 } 6012#endif 6013 } 6014 6015 if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) || 6016 (ifp == nat->nat_ifps[1]))) { 6017 nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0], 6018 nat->nat_v[0]); 6019 if ((nat->nat_ifps[0] != NULL) && 6020 (nat->nat_ifps[0] != (void *)-1)) { 6021 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 6022 } 6023 if (nat->nat_ifnames[1][0] != '\0') { 6024 nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1], 6025 nat->nat_v[1]); 6026 } else { 6027 nat->nat_ifps[1] = nat->nat_ifps[0]; 6028 } 6029 if ((nat->nat_ifps[1] != NULL) && 6030 (nat->nat_ifps[1] != (void *)-1)) { 6031 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 6032 } 6033 ifp2 = nat->nat_ifps[0]; 6034 if (ifp2 == NULL) 6035 continue; 6036 6037 /* 6038 * Change the map-to address to be the same as the 6039 * new one. 6040 */ 6041 sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 6042 if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2, 6043 &in, NULL) != -1) { 6044 if (nat->nat_v[0] == 4) 6045 nat->nat_nsrcip = in.in4; 6046 } 6047 sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 6048 6049 if (sum1 == sum2) 6050 continue; 6051 /* 6052 * Readjust the checksum adjustment to take into 6053 * account the new IP#. 6054 */ 6055 CALC_SUMD(sum1, sum2, sumd); 6056 /* XXX - dont change for TCP when solaris does 6057 * hardware checksumming. 6058 */ 6059 sumd += nat->nat_sumd[0]; 6060 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 6061 nat->nat_sumd[1] = nat->nat_sumd[0]; 6062 } 6063 } 6064 6065 for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) { 6066 char *base = n->in_names; 6067 6068 if ((ifp == NULL) || (n->in_ifps[0] == ifp)) 6069 n->in_ifps[0] = ipf_resolvenic(softc, 6070 base + n->in_ifnames[0], 6071 n->in_v[0]); 6072 if ((ifp == NULL) || (n->in_ifps[1] == ifp)) 6073 n->in_ifps[1] = ipf_resolvenic(softc, 6074 base + n->in_ifnames[1], 6075 n->in_v[1]); 6076 6077 if (n->in_redir & NAT_REDIRECT) 6078 idx = 1; 6079 else 6080 idx = 0; 6081 6082 if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) && 6083 (n->in_ifps[idx] != NULL && 6084 n->in_ifps[idx] != (void *)-1)) { 6085 6086 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 6087 0, n->in_ifps[idx]); 6088 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 6089 0, n->in_ifps[idx]); 6090 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 6091 0, n->in_ifps[idx]); 6092 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 6093 0, n->in_ifps[idx]); 6094 } 6095 } 6096 RWLOCK_EXIT(&softc->ipf_nat); 6097 SPL_X(s); 6098} 6099 6100 6101/* ------------------------------------------------------------------------ */ 6102/* Function: ipf_nat_icmpquerytype */ 6103/* Returns: int - 1 == success, 0 == failure */ 6104/* Parameters: icmptype(I) - ICMP type number */ 6105/* */ 6106/* Tests to see if the ICMP type number passed is a query/response type or */ 6107/* not. */ 6108/* ------------------------------------------------------------------------ */ 6109static int 6110ipf_nat_icmpquerytype(icmptype) 6111 int icmptype; 6112{ 6113 6114 /* 6115 * For the ICMP query NAT code, it is essential that both the query 6116 * and the reply match on the NAT rule. Because the NAT structure 6117 * does not keep track of the icmptype, and a single NAT structure 6118 * is used for all icmp types with the same src, dest and id, we 6119 * simply define the replies as queries as well. The funny thing is, 6120 * altough it seems silly to call a reply a query, this is exactly 6121 * as it is defined in the IPv4 specification 6122 */ 6123 switch (icmptype) 6124 { 6125 case ICMP_ECHOREPLY: 6126 case ICMP_ECHO: 6127 /* route advertisement/solicitation is currently unsupported: */ 6128 /* it would require rewriting the ICMP data section */ 6129 case ICMP_TSTAMP: 6130 case ICMP_TSTAMPREPLY: 6131 case ICMP_IREQ: 6132 case ICMP_IREQREPLY: 6133 case ICMP_MASKREQ: 6134 case ICMP_MASKREPLY: 6135 return 1; 6136 default: 6137 return 0; 6138 } 6139} 6140 6141 6142/* ------------------------------------------------------------------------ */ 6143/* Function: nat_log */ 6144/* Returns: Nil */ 6145/* Parameters: softc(I) - pointer to soft context main structure */ 6146/* softn(I) - pointer to NAT context structure */ 6147/* nat(I) - pointer to NAT structure */ 6148/* action(I) - action related to NAT structure being performed */ 6149/* */ 6150/* Creates a NAT log entry. */ 6151/* ------------------------------------------------------------------------ */ 6152void 6153ipf_nat_log(softc, softn, nat, action) 6154 ipf_main_softc_t *softc; 6155 ipf_nat_softc_t *softn; 6156 struct nat *nat; 6157 u_int action; 6158{ 6159#ifdef IPFILTER_LOG 6160# ifndef LARGE_NAT 6161 struct ipnat *np; 6162 int rulen; 6163# endif 6164 struct natlog natl; 6165 void *items[1]; 6166 size_t sizes[1]; 6167 int types[1]; 6168 6169 bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip, 6170 sizeof(natl.nl_osrcip)); 6171 bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip, 6172 sizeof(natl.nl_nsrcip)); 6173 bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip, 6174 sizeof(natl.nl_odstip)); 6175 bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip, 6176 sizeof(natl.nl_ndstip)); 6177 6178 natl.nl_bytes[0] = nat->nat_bytes[0]; 6179 natl.nl_bytes[1] = nat->nat_bytes[1]; 6180 natl.nl_pkts[0] = nat->nat_pkts[0]; 6181 natl.nl_pkts[1] = nat->nat_pkts[1]; 6182 natl.nl_odstport = nat->nat_odport; 6183 natl.nl_osrcport = nat->nat_osport; 6184 natl.nl_nsrcport = nat->nat_nsport; 6185 natl.nl_ndstport = nat->nat_ndport; 6186 natl.nl_p[0] = nat->nat_pr[0]; 6187 natl.nl_p[1] = nat->nat_pr[1]; 6188 natl.nl_v[0] = nat->nat_v[0]; 6189 natl.nl_v[1] = nat->nat_v[1]; 6190 natl.nl_type = nat->nat_redir; 6191 natl.nl_action = action; 6192 natl.nl_rule = -1; 6193 6194 bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0], 6195 sizeof(nat->nat_ifnames[0])); 6196 bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1], 6197 sizeof(nat->nat_ifnames[1])); 6198 6199# ifndef LARGE_NAT 6200 if (nat->nat_ptr != NULL) { 6201 for (rulen = 0, np = softn->ipf_nat_list; np != NULL; 6202 np = np->in_next, rulen++) 6203 if (np == nat->nat_ptr) { 6204 natl.nl_rule = rulen; 6205 break; 6206 } 6207 } 6208# endif 6209 items[0] = &natl; 6210 sizes[0] = sizeof(natl); 6211 types[0] = 0; 6212 6213 (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1); 6214#endif 6215} 6216 6217 6218#if defined(__OpenBSD__) 6219/* ------------------------------------------------------------------------ */ 6220/* Function: ipf_nat_ifdetach */ 6221/* Returns: Nil */ 6222/* Parameters: ifp(I) - pointer to network interface */ 6223/* */ 6224/* Compatibility interface for OpenBSD to trigger the correct updating of */ 6225/* interface references within IPFilter. */ 6226/* ------------------------------------------------------------------------ */ 6227void 6228ipf_nat_ifdetach(ifp) 6229 void *ifp; 6230{ 6231 ipf_main_softc_t *softc; 6232 6233 softc = ipf_get_softc(0); 6234 6235 ipf_sync(ifp); 6236 return; 6237} 6238#endif 6239 6240 6241/* ------------------------------------------------------------------------ */ 6242/* Function: ipf_nat_rule_deref */ 6243/* Returns: Nil */ 6244/* Parameters: softc(I) - pointer to soft context main structure */ 6245/* inp(I) - pointer to pointer to NAT rule */ 6246/* Write Locks: ipf_nat */ 6247/* */ 6248/* Dropping the refernce count for a rule means that whatever held the */ 6249/* pointer to this rule (*inp) is no longer interested in it and when the */ 6250/* reference count drops to zero, any resources allocated for the rule can */ 6251/* be released and the rule itself free'd. */ 6252/* ------------------------------------------------------------------------ */ 6253void 6254ipf_nat_rule_deref(softc, inp) 6255 ipf_main_softc_t *softc; 6256 ipnat_t **inp; 6257{ 6258 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6259 ipnat_t *n; 6260 6261 n = *inp; 6262 *inp = NULL; 6263 n->in_use--; 6264 if (n->in_use > 0) 6265 return; 6266 6267 if (n->in_apr != NULL) 6268 ipf_proxy_deref(n->in_apr); 6269 6270 ipf_nat_rule_fini(softc, n); 6271 6272 if (n->in_redir & NAT_REDIRECT) { 6273 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6274 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr); 6275 } 6276 } 6277 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 6278 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6279 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map); 6280 } 6281 } 6282 6283 if (n->in_tqehead[0] != NULL) { 6284 if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) { 6285 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6286 } 6287 } 6288 6289 if (n->in_tqehead[1] != NULL) { 6290 if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) { 6291 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6292 } 6293 } 6294 6295 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6296 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules); 6297 } 6298 6299 MUTEX_DESTROY(&n->in_lock); 6300 6301 KFREES(n, n->in_size); 6302 6303#if SOLARIS && !defined(INSTANCES) 6304 if (softn->ipf_nat_stats.ns_rules == 0) 6305 pfil_delayed_copy = 1; 6306#endif 6307} 6308 6309 6310/* ------------------------------------------------------------------------ */ 6311/* Function: ipf_nat_deref */ 6312/* Returns: Nil */ 6313/* Parameters: softc(I) - pointer to soft context main structure */ 6314/* natp(I) - pointer to pointer to NAT table entry */ 6315/* */ 6316/* Decrement the reference counter for this NAT table entry and free it if */ 6317/* there are no more things using it. */ 6318/* */ 6319/* IF nat_ref == 1 when this function is called, then we have an orphan nat */ 6320/* structure *because* it only gets called on paths _after_ nat_ref has been*/ 6321/* incremented. If nat_ref == 1 then we shouldn't decrement it here */ 6322/* because nat_delete() will do that and send nat_ref to -1. */ 6323/* */ 6324/* Holding the lock on nat_lock is required to serialise nat_delete() being */ 6325/* called from a NAT flush ioctl with a deref happening because of a packet.*/ 6326/* ------------------------------------------------------------------------ */ 6327void 6328ipf_nat_deref(softc, natp) 6329 ipf_main_softc_t *softc; 6330 nat_t **natp; 6331{ 6332 nat_t *nat; 6333 6334 nat = *natp; 6335 *natp = NULL; 6336 6337 MUTEX_ENTER(&nat->nat_lock); 6338 if (nat->nat_ref > 1) { 6339 nat->nat_ref--; 6340 ASSERT(nat->nat_ref >= 0); 6341 MUTEX_EXIT(&nat->nat_lock); 6342 return; 6343 } 6344 MUTEX_EXIT(&nat->nat_lock); 6345 6346 WRITE_ENTER(&softc->ipf_nat); 6347 ipf_nat_delete(softc, nat, NL_EXPIRE); 6348 RWLOCK_EXIT(&softc->ipf_nat); 6349} 6350 6351 6352/* ------------------------------------------------------------------------ */ 6353/* Function: ipf_nat_clone */ 6354/* Returns: ipstate_t* - NULL == cloning failed, */ 6355/* else pointer to new state structure */ 6356/* Parameters: fin(I) - pointer to packet information */ 6357/* is(I) - pointer to master state structure */ 6358/* Write Lock: ipf_nat */ 6359/* */ 6360/* Create a "duplcate" state table entry from the master. */ 6361/* ------------------------------------------------------------------------ */ 6362nat_t * 6363ipf_nat_clone(fin, nat) 6364 fr_info_t *fin; 6365 nat_t *nat; 6366{ 6367 ipf_main_softc_t *softc = fin->fin_main_soft; 6368 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6369 frentry_t *fr; 6370 nat_t *clone; 6371 ipnat_t *np; 6372 6373 KMALLOC(clone, nat_t *); 6374 if (clone == NULL) { 6375 NBUMPSIDED(fin->fin_out, ns_clone_nomem); 6376 return NULL; 6377 } 6378 bcopy((char *)nat, (char *)clone, sizeof(*clone)); 6379 6380 MUTEX_NUKE(&clone->nat_lock); 6381 6382 clone->nat_rev = fin->fin_rev; 6383 clone->nat_aps = NULL; 6384 /* 6385 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 6386 */ 6387 clone->nat_tqe.tqe_pnext = NULL; 6388 clone->nat_tqe.tqe_next = NULL; 6389 clone->nat_tqe.tqe_ifq = NULL; 6390 clone->nat_tqe.tqe_parent = clone; 6391 6392 clone->nat_flags &= ~SI_CLONE; 6393 clone->nat_flags |= SI_CLONED; 6394 6395 if (clone->nat_hm) 6396 clone->nat_hm->hm_ref++; 6397 6398 if (ipf_nat_insert(softc, softn, clone) == -1) { 6399 KFREE(clone); 6400 NBUMPSIDED(fin->fin_out, ns_insert_fail); 6401 return NULL; 6402 } 6403 6404 np = clone->nat_ptr; 6405 if (np != NULL) { 6406 if (softn->ipf_nat_logging) 6407 ipf_nat_log(softc, softn, clone, NL_CLONE); 6408 np->in_use++; 6409 } 6410 fr = clone->nat_fr; 6411 if (fr != NULL) { 6412 MUTEX_ENTER(&fr->fr_lock); 6413 fr->fr_ref++; 6414 MUTEX_EXIT(&fr->fr_lock); 6415 } 6416 6417 6418 /* 6419 * Because the clone is created outside the normal loop of things and 6420 * TCP has special needs in terms of state, initialise the timeout 6421 * state of the new NAT from here. 6422 */ 6423 if (clone->nat_pr[0] == IPPROTO_TCP) { 6424 (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq, 6425 clone->nat_flags, 2); 6426 } 6427 clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone); 6428 if (softn->ipf_nat_logging) 6429 ipf_nat_log(softc, softn, clone, NL_CLONE); 6430 return clone; 6431} 6432 6433 6434/* ------------------------------------------------------------------------ */ 6435/* Function: ipf_nat_wildok */ 6436/* Returns: int - 1 == packet's ports match wildcards */ 6437/* 0 == packet's ports don't match wildcards */ 6438/* Parameters: nat(I) - NAT entry */ 6439/* sport(I) - source port */ 6440/* dport(I) - destination port */ 6441/* flags(I) - wildcard flags */ 6442/* dir(I) - packet direction */ 6443/* */ 6444/* Use NAT entry and packet direction to determine which combination of */ 6445/* wildcard flags should be used. */ 6446/* ------------------------------------------------------------------------ */ 6447int 6448ipf_nat_wildok(nat, sport, dport, flags, dir) 6449 nat_t *nat; 6450 int sport, dport, flags, dir; 6451{ 6452 /* 6453 * When called by dir is set to 6454 * nat_inlookup NAT_INBOUND (0) 6455 * nat_outlookup NAT_OUTBOUND (1) 6456 * 6457 * We simply combine the packet's direction in dir with the original 6458 * "intended" direction of that NAT entry in nat->nat_dir to decide 6459 * which combination of wildcard flags to allow. 6460 */ 6461 switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))) 6462 { 6463 case 3: /* outbound packet / outbound entry */ 6464 if (((nat->nat_osport == sport) || 6465 (flags & SI_W_SPORT)) && 6466 ((nat->nat_odport == dport) || 6467 (flags & SI_W_DPORT))) 6468 return 1; 6469 break; 6470 case 2: /* outbound packet / inbound entry */ 6471 if (((nat->nat_osport == dport) || 6472 (flags & SI_W_SPORT)) && 6473 ((nat->nat_odport == sport) || 6474 (flags & SI_W_DPORT))) 6475 return 1; 6476 break; 6477 case 1: /* inbound packet / outbound entry */ 6478 if (((nat->nat_osport == dport) || 6479 (flags & SI_W_SPORT)) && 6480 ((nat->nat_odport == sport) || 6481 (flags & SI_W_DPORT))) 6482 return 1; 6483 break; 6484 case 0: /* inbound packet / inbound entry */ 6485 if (((nat->nat_osport == sport) || 6486 (flags & SI_W_SPORT)) && 6487 ((nat->nat_odport == dport) || 6488 (flags & SI_W_DPORT))) 6489 return 1; 6490 break; 6491 default: 6492 break; 6493 } 6494 6495 return(0); 6496} 6497 6498 6499/* ------------------------------------------------------------------------ */ 6500/* Function: nat_mssclamp */ 6501/* Returns: Nil */ 6502/* Parameters: tcp(I) - pointer to TCP header */ 6503/* maxmss(I) - value to clamp the TCP MSS to */ 6504/* fin(I) - pointer to packet information */ 6505/* csump(I) - pointer to TCP checksum */ 6506/* */ 6507/* Check for MSS option and clamp it if necessary. If found and changed, */ 6508/* then the TCP header checksum will be updated to reflect the change in */ 6509/* the MSS. */ 6510/* ------------------------------------------------------------------------ */ 6511static void 6512ipf_nat_mssclamp(tcp, maxmss, fin, csump) 6513 tcphdr_t *tcp; 6514 u_32_t maxmss; 6515 fr_info_t *fin; 6516 u_short *csump; 6517{ 6518 u_char *cp, *ep, opt; 6519 int hlen, advance; 6520 u_32_t mss, sumd; 6521 6522 hlen = TCP_OFF(tcp) << 2; 6523 if (hlen > sizeof(*tcp)) { 6524 cp = (u_char *)tcp + sizeof(*tcp); 6525 ep = (u_char *)tcp + hlen; 6526 6527 while (cp < ep) { 6528 opt = cp[0]; 6529 if (opt == TCPOPT_EOL) 6530 break; 6531 else if (opt == TCPOPT_NOP) { 6532 cp++; 6533 continue; 6534 } 6535 6536 if (cp + 1 >= ep) 6537 break; 6538 advance = cp[1]; 6539 if ((cp + advance > ep) || (advance <= 0)) 6540 break; 6541 switch (opt) 6542 { 6543 case TCPOPT_MAXSEG: 6544 if (advance != 4) 6545 break; 6546 mss = cp[2] * 256 + cp[3]; 6547 if (mss > maxmss) { 6548 cp[2] = maxmss / 256; 6549 cp[3] = maxmss & 0xff; 6550 CALC_SUMD(mss, maxmss, sumd); 6551 ipf_fix_outcksum(0, csump, sumd, 0); 6552 } 6553 break; 6554 default: 6555 /* ignore unknown options */ 6556 break; 6557 } 6558 6559 cp += advance; 6560 } 6561 } 6562} 6563 6564 6565/* ------------------------------------------------------------------------ */ 6566/* Function: ipf_nat_setqueue */ 6567/* Returns: Nil */ 6568/* Parameters: softc(I) - pointer to soft context main structure */ 6569/* softn(I) - pointer to NAT context structure */ 6570/* nat(I)- pointer to NAT structure */ 6571/* Locks: ipf_nat (read or write) */ 6572/* */ 6573/* Put the NAT entry on its default queue entry, using rev as a helped in */ 6574/* determining which queue it should be placed on. */ 6575/* ------------------------------------------------------------------------ */ 6576void 6577ipf_nat_setqueue(softc, softn, nat) 6578 ipf_main_softc_t *softc; 6579 ipf_nat_softc_t *softn; 6580 nat_t *nat; 6581{ 6582 ipftq_t *oifq, *nifq; 6583 int rev = nat->nat_rev; 6584 6585 if (nat->nat_ptr != NULL) 6586 nifq = nat->nat_ptr->in_tqehead[rev]; 6587 else 6588 nifq = NULL; 6589 6590 if (nifq == NULL) { 6591 switch (nat->nat_pr[0]) 6592 { 6593 case IPPROTO_UDP : 6594 nifq = &softn->ipf_nat_udptq; 6595 break; 6596 case IPPROTO_ICMP : 6597 nifq = &softn->ipf_nat_icmptq; 6598 break; 6599 case IPPROTO_TCP : 6600 nifq = softn->ipf_nat_tcptq + 6601 nat->nat_tqe.tqe_state[rev]; 6602 break; 6603 default : 6604 nifq = &softn->ipf_nat_iptq; 6605 break; 6606 } 6607 } 6608 6609 oifq = nat->nat_tqe.tqe_ifq; 6610 /* 6611 * If it's currently on a timeout queue, move it from one queue to 6612 * another, else put it on the end of the newly determined queue. 6613 */ 6614 if (oifq != NULL) 6615 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq); 6616 else 6617 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat); 6618 return; 6619} 6620 6621 6622/* ------------------------------------------------------------------------ */ 6623/* Function: nat_getnext */ 6624/* Returns: int - 0 == ok, else error */ 6625/* Parameters: softc(I) - pointer to soft context main structure */ 6626/* t(I) - pointer to ipftoken structure */ 6627/* itp(I) - pointer to ipfgeniter_t structure */ 6628/* */ 6629/* Fetch the next nat/ipnat structure pointer from the linked list and */ 6630/* copy it out to the storage space pointed to by itp_data. The next item */ 6631/* in the list to look at is put back in the ipftoken struture. */ 6632/* ------------------------------------------------------------------------ */ 6633static int 6634ipf_nat_getnext(softc, t, itp, objp) 6635 ipf_main_softc_t *softc; 6636 ipftoken_t *t; 6637 ipfgeniter_t *itp; 6638 ipfobj_t *objp; 6639{ 6640 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6641 hostmap_t *hm, *nexthm = NULL, zerohm; 6642 ipnat_t *ipn, *nextipnat = NULL, zeroipn; 6643 nat_t *nat, *nextnat = NULL, zeronat; 6644 int error = 0; 6645 void *nnext; 6646 6647 if (itp->igi_nitems != 1) { 6648 IPFERROR(60075); 6649 return ENOSPC; 6650 } 6651 6652 READ_ENTER(&softc->ipf_nat); 6653 6654 switch (itp->igi_type) 6655 { 6656 case IPFGENITER_HOSTMAP : 6657 hm = t->ipt_data; 6658 if (hm == NULL) { 6659 nexthm = softn->ipf_hm_maplist; 6660 } else { 6661 nexthm = hm->hm_next; 6662 } 6663 if (nexthm != NULL) { 6664 ATOMIC_INC32(nexthm->hm_ref); 6665 t->ipt_data = nexthm; 6666 } else { 6667 bzero(&zerohm, sizeof(zerohm)); 6668 nexthm = &zerohm; 6669 t->ipt_data = NULL; 6670 } 6671 nnext = nexthm->hm_next; 6672 break; 6673 6674 case IPFGENITER_IPNAT : 6675 ipn = t->ipt_data; 6676 if (ipn == NULL) { 6677 nextipnat = softn->ipf_nat_list; 6678 } else { 6679 nextipnat = ipn->in_next; 6680 } 6681 if (nextipnat != NULL) { 6682 ATOMIC_INC32(nextipnat->in_use); 6683 t->ipt_data = nextipnat; 6684 } else { 6685 bzero(&zeroipn, sizeof(zeroipn)); 6686 nextipnat = &zeroipn; 6687 t->ipt_data = NULL; 6688 } 6689 nnext = nextipnat->in_next; 6690 break; 6691 6692 case IPFGENITER_NAT : 6693 nat = t->ipt_data; 6694 if (nat == NULL) { 6695 nextnat = softn->ipf_nat_instances; 6696 } else { 6697 nextnat = nat->nat_next; 6698 } 6699 if (nextnat != NULL) { 6700 MUTEX_ENTER(&nextnat->nat_lock); 6701 nextnat->nat_ref++; 6702 MUTEX_EXIT(&nextnat->nat_lock); 6703 t->ipt_data = nextnat; 6704 } else { 6705 bzero(&zeronat, sizeof(zeronat)); 6706 nextnat = &zeronat; 6707 t->ipt_data = NULL; 6708 } 6709 nnext = nextnat->nat_next; 6710 break; 6711 6712 default : 6713 RWLOCK_EXIT(&softc->ipf_nat); 6714 IPFERROR(60055); 6715 return EINVAL; 6716 } 6717 6718 RWLOCK_EXIT(&softc->ipf_nat); 6719 6720 objp->ipfo_ptr = itp->igi_data; 6721 6722 switch (itp->igi_type) 6723 { 6724 case IPFGENITER_HOSTMAP : 6725 error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm)); 6726 if (error != 0) { 6727 IPFERROR(60049); 6728 error = EFAULT; 6729 } 6730 if (hm != NULL) { 6731 WRITE_ENTER(&softc->ipf_nat); 6732 ipf_nat_hostmapdel(softc, &hm); 6733 RWLOCK_EXIT(&softc->ipf_nat); 6734 } 6735 break; 6736 6737 case IPFGENITER_IPNAT : 6738 objp->ipfo_size = nextipnat->in_size; 6739 objp->ipfo_type = IPFOBJ_IPNAT; 6740 error = ipf_outobjk(softc, objp, nextipnat); 6741 if (ipn != NULL) { 6742 WRITE_ENTER(&softc->ipf_nat); 6743 ipf_nat_rule_deref(softc, &ipn); 6744 RWLOCK_EXIT(&softc->ipf_nat); 6745 } 6746 break; 6747 6748 case IPFGENITER_NAT : 6749 objp->ipfo_size = sizeof(nat_t); 6750 objp->ipfo_type = IPFOBJ_NAT; 6751 error = ipf_outobjk(softc, objp, nextnat); 6752 if (nat != NULL) 6753 ipf_nat_deref(softc, &nat); 6754 6755 break; 6756 } 6757 6758 if (nnext == NULL) 6759 ipf_token_mark_complete(t); 6760 6761 return error; 6762} 6763 6764 6765/* ------------------------------------------------------------------------ */ 6766/* Function: nat_extraflush */ 6767/* Returns: int - 0 == success, -1 == failure */ 6768/* Parameters: softc(I) - pointer to soft context main structure */ 6769/* softn(I) - pointer to NAT context structure */ 6770/* which(I) - how to flush the active NAT table */ 6771/* Write Locks: ipf_nat */ 6772/* */ 6773/* Flush nat tables. Three actions currently defined: */ 6774/* which == 0 : flush all nat table entries */ 6775/* which == 1 : flush TCP connections which have started to close but are */ 6776/* stuck for some reason. */ 6777/* which == 2 : flush TCP connections which have been idle for a long time, */ 6778/* starting at > 4 days idle and working back in successive half-*/ 6779/* days to at most 12 hours old. If this fails to free enough */ 6780/* slots then work backwards in half hour slots to 30 minutes. */ 6781/* If that too fails, then work backwards in 30 second intervals */ 6782/* for the last 30 minutes to at worst 30 seconds idle. */ 6783/* ------------------------------------------------------------------------ */ 6784static int 6785ipf_nat_extraflush(softc, softn, which) 6786 ipf_main_softc_t *softc; 6787 ipf_nat_softc_t *softn; 6788 int which; 6789{ 6790 nat_t *nat, **natp; 6791 ipftqent_t *tqn; 6792 ipftq_t *ifq; 6793 int removed; 6794 SPL_INT(s); 6795 6796 removed = 0; 6797 6798 SPL_NET(s); 6799 switch (which) 6800 { 6801 case 0 : 6802 softn->ipf_nat_stats.ns_flush_all++; 6803 /* 6804 * Style 0 flush removes everything... 6805 */ 6806 for (natp = &softn->ipf_nat_instances; 6807 ((nat = *natp) != NULL); ) { 6808 ipf_nat_delete(softc, nat, NL_FLUSH); 6809 removed++; 6810 } 6811 break; 6812 6813 case 1 : 6814 softn->ipf_nat_stats.ns_flush_closing++; 6815 /* 6816 * Since we're only interested in things that are closing, 6817 * we can start with the appropriate timeout queue. 6818 */ 6819 for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT; 6820 ifq != NULL; ifq = ifq->ifq_next) { 6821 6822 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6823 nat = tqn->tqe_parent; 6824 tqn = tqn->tqe_next; 6825 if (nat->nat_pr[0] != IPPROTO_TCP || 6826 nat->nat_pr[1] != IPPROTO_TCP) 6827 break; 6828 ipf_nat_delete(softc, nat, NL_EXPIRE); 6829 removed++; 6830 } 6831 } 6832 6833 /* 6834 * Also need to look through the user defined queues. 6835 */ 6836 for (ifq = softn->ipf_nat_utqe; ifq != NULL; 6837 ifq = ifq->ifq_next) { 6838 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6839 nat = tqn->tqe_parent; 6840 tqn = tqn->tqe_next; 6841 if (nat->nat_pr[0] != IPPROTO_TCP || 6842 nat->nat_pr[1] != IPPROTO_TCP) 6843 continue; 6844 6845 if ((nat->nat_tcpstate[0] > 6846 IPF_TCPS_ESTABLISHED) && 6847 (nat->nat_tcpstate[1] > 6848 IPF_TCPS_ESTABLISHED)) { 6849 ipf_nat_delete(softc, nat, NL_EXPIRE); 6850 removed++; 6851 } 6852 } 6853 } 6854 break; 6855 6856 /* 6857 * Args 5-11 correspond to flushing those particular states 6858 * for TCP connections. 6859 */ 6860 case IPF_TCPS_CLOSE_WAIT : 6861 case IPF_TCPS_FIN_WAIT_1 : 6862 case IPF_TCPS_CLOSING : 6863 case IPF_TCPS_LAST_ACK : 6864 case IPF_TCPS_FIN_WAIT_2 : 6865 case IPF_TCPS_TIME_WAIT : 6866 case IPF_TCPS_CLOSED : 6867 softn->ipf_nat_stats.ns_flush_state++; 6868 tqn = softn->ipf_nat_tcptq[which].ifq_head; 6869 while (tqn != NULL) { 6870 nat = tqn->tqe_parent; 6871 tqn = tqn->tqe_next; 6872 ipf_nat_delete(softc, nat, NL_FLUSH); 6873 removed++; 6874 } 6875 break; 6876 6877 default : 6878 if (which < 30) 6879 break; 6880 6881 softn->ipf_nat_stats.ns_flush_timeout++; 6882 /* 6883 * Take a large arbitrary number to mean the number of seconds 6884 * for which which consider to be the maximum value we'll allow 6885 * the expiration to be. 6886 */ 6887 which = IPF_TTLVAL(which); 6888 for (natp = &softn->ipf_nat_instances; 6889 ((nat = *natp) != NULL); ) { 6890 if (softc->ipf_ticks - nat->nat_touched > which) { 6891 ipf_nat_delete(softc, nat, NL_FLUSH); 6892 removed++; 6893 } else 6894 natp = &nat->nat_next; 6895 } 6896 break; 6897 } 6898 6899 if (which != 2) { 6900 SPL_X(s); 6901 return removed; 6902 } 6903 6904 softn->ipf_nat_stats.ns_flush_queue++; 6905 6906 /* 6907 * Asked to remove inactive entries because the table is full, try 6908 * again, 3 times, if first attempt failed with a different criteria 6909 * each time. The order tried in must be in decreasing age. 6910 * Another alternative is to implement random drop and drop N entries 6911 * at random until N have been freed up. 6912 */ 6913 if (softc->ipf_ticks - softn->ipf_nat_last_force_flush > 6914 IPF_TTLVAL(5)) { 6915 softn->ipf_nat_last_force_flush = softc->ipf_ticks; 6916 6917 removed = ipf_queueflush(softc, ipf_nat_flush_entry, 6918 softn->ipf_nat_tcptq, 6919 softn->ipf_nat_utqe, 6920 &softn->ipf_nat_stats.ns_active, 6921 softn->ipf_nat_table_sz, 6922 softn->ipf_nat_table_wm_low); 6923 } 6924 6925 SPL_X(s); 6926 return removed; 6927} 6928 6929 6930/* ------------------------------------------------------------------------ */ 6931/* Function: ipf_nat_flush_entry */ 6932/* Returns: 0 - always succeeds */ 6933/* Parameters: softc(I) - pointer to soft context main structure */ 6934/* entry(I) - pointer to NAT entry */ 6935/* Write Locks: ipf_nat */ 6936/* */ 6937/* This function is a stepping stone between ipf_queueflush() and */ 6938/* nat_dlete(). It is used so we can provide a uniform interface via the */ 6939/* ipf_queueflush() function. Since the nat_delete() function returns void */ 6940/* we translate that to mean it always succeeds in deleting something. */ 6941/* ------------------------------------------------------------------------ */ 6942static int 6943ipf_nat_flush_entry(softc, entry) 6944 ipf_main_softc_t *softc; 6945 void *entry; 6946{ 6947 ipf_nat_delete(softc, entry, NL_FLUSH); 6948 return 0; 6949} 6950 6951 6952/* ------------------------------------------------------------------------ */ 6953/* Function: ipf_nat_iterator */ 6954/* Returns: int - 0 == ok, else error */ 6955/* Parameters: softc(I) - pointer to soft context main structure */ 6956/* token(I) - pointer to ipftoken structure */ 6957/* itp(I) - pointer to ipfgeniter_t structure */ 6958/* obj(I) - pointer to data description structure */ 6959/* */ 6960/* This function acts as a handler for the SIOCGENITER ioctls that use a */ 6961/* generic structure to iterate through a list. There are three different */ 6962/* linked lists of NAT related information to go through: NAT rules, active */ 6963/* NAT mappings and the NAT fragment cache. */ 6964/* ------------------------------------------------------------------------ */ 6965static int 6966ipf_nat_iterator(softc, token, itp, obj) 6967 ipf_main_softc_t *softc; 6968 ipftoken_t *token; 6969 ipfgeniter_t *itp; 6970 ipfobj_t *obj; 6971{ 6972 int error; 6973 6974 if (itp->igi_data == NULL) { 6975 IPFERROR(60052); 6976 return EFAULT; 6977 } 6978 6979 switch (itp->igi_type) 6980 { 6981 case IPFGENITER_HOSTMAP : 6982 case IPFGENITER_IPNAT : 6983 case IPFGENITER_NAT : 6984 error = ipf_nat_getnext(softc, token, itp, obj); 6985 break; 6986 6987 case IPFGENITER_NATFRAG : 6988 error = ipf_frag_nat_next(softc, token, itp); 6989 break; 6990 default : 6991 IPFERROR(60053); 6992 error = EINVAL; 6993 break; 6994 } 6995 6996 return error; 6997} 6998 6999 7000/* ------------------------------------------------------------------------ */ 7001/* Function: ipf_nat_setpending */ 7002/* Returns: Nil */ 7003/* Parameters: softc(I) - pointer to soft context main structure */ 7004/* nat(I) - pointer to NAT structure */ 7005/* Locks: ipf_nat (read or write) */ 7006/* */ 7007/* Put the NAT entry on to the pending queue - this queue has a very short */ 7008/* lifetime where items are put that can't be deleted straight away because */ 7009/* of locking issues but we want to delete them ASAP, anyway. In calling */ 7010/* this function, it is assumed that the owner (if there is one, as shown */ 7011/* by nat_me) is no longer interested in it. */ 7012/* ------------------------------------------------------------------------ */ 7013void 7014ipf_nat_setpending(softc, nat) 7015 ipf_main_softc_t *softc; 7016 nat_t *nat; 7017{ 7018 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7019 ipftq_t *oifq; 7020 7021 oifq = nat->nat_tqe.tqe_ifq; 7022 if (oifq != NULL) 7023 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, 7024 &softn->ipf_nat_pending); 7025 else 7026 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, 7027 &softn->ipf_nat_pending, nat); 7028 7029 if (nat->nat_me != NULL) { 7030 *nat->nat_me = NULL; 7031 nat->nat_me = NULL; 7032 nat->nat_ref--; 7033 ASSERT(nat->nat_ref >= 0); 7034 } 7035} 7036 7037 7038/* ------------------------------------------------------------------------ */ 7039/* Function: nat_newrewrite */ 7040/* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 7041/* allow rule to be moved if IPN_ROUNDR is set. */ 7042/* Parameters: fin(I) - pointer to packet information */ 7043/* nat(I) - pointer to NAT entry */ 7044/* ni(I) - pointer to structure with misc. information needed */ 7045/* to create new NAT entry. */ 7046/* Write Lock: ipf_nat */ 7047/* */ 7048/* This function is responsible for setting up an active NAT session where */ 7049/* we are changing both the source and destination parameters at the same */ 7050/* time. The loop in here works differently to elsewhere - each iteration */ 7051/* is responsible for changing a single parameter that can be incremented. */ 7052/* So one pass may increase the source IP#, next source port, next dest. IP#*/ 7053/* and the last destination port for a total of 4 iterations to try each. */ 7054/* This is done to try and exhaustively use the translation space available.*/ 7055/* ------------------------------------------------------------------------ */ 7056static int 7057ipf_nat_newrewrite(fin, nat, nai) 7058 fr_info_t *fin; 7059 nat_t *nat; 7060 natinfo_t *nai; 7061{ 7062 int src_search = 1; 7063 int dst_search = 1; 7064 fr_info_t frnat; 7065 u_32_t flags; 7066 u_short swap; 7067 ipnat_t *np; 7068 nat_t *natl; 7069 int l = 0; 7070 int changed; 7071 7072 natl = NULL; 7073 changed = -1; 7074 np = nai->nai_np; 7075 flags = nat->nat_flags; 7076 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 7077 7078 nat->nat_hm = NULL; 7079 7080 do { 7081 changed = -1; 7082 /* TRACE (l, src_search, dst_search, np) */ 7083 DT4(ipf_nat_rewrite_1, int, l, int, src_search, int, dst_search, ipnat_t *, np); 7084 7085 if ((src_search == 0) && (np->in_spnext == 0) && 7086 (dst_search == 0) && (np->in_dpnext == 0)) { 7087 if (l > 0) 7088 return -1; 7089 } 7090 7091 /* 7092 * Find a new source address 7093 */ 7094 if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr, 7095 &frnat.fin_saddr) == -1) { 7096 return -1; 7097 } 7098 7099 if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) { 7100 src_search = 0; 7101 if (np->in_stepnext == 0) 7102 np->in_stepnext = 1; 7103 7104 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 7105 src_search = 0; 7106 if (np->in_stepnext == 0) 7107 np->in_stepnext = 1; 7108 7109 } else if (np->in_nsrcmsk == 0xffffffff) { 7110 src_search = 0; 7111 if (np->in_stepnext == 0) 7112 np->in_stepnext = 1; 7113 7114 } else if (np->in_nsrcmsk != 0xffffffff) { 7115 if (np->in_stepnext == 0 && changed == -1) { 7116 np->in_snip++; 7117 np->in_stepnext++; 7118 changed = 0; 7119 } 7120 } 7121 7122 if ((flags & IPN_TCPUDPICMP) != 0) { 7123 if (np->in_spnext != 0) 7124 frnat.fin_data[0] = np->in_spnext; 7125 7126 /* 7127 * Standard port translation. Select next port. 7128 */ 7129 if ((flags & IPN_FIXEDSPORT) != 0) { 7130 np->in_stepnext = 2; 7131 } else if ((np->in_stepnext == 1) && 7132 (changed == -1) && (natl != NULL)) { 7133 np->in_spnext++; 7134 np->in_stepnext++; 7135 changed = 1; 7136 if (np->in_spnext > np->in_spmax) 7137 np->in_spnext = np->in_spmin; 7138 } 7139 } else { 7140 np->in_stepnext = 2; 7141 } 7142 np->in_stepnext &= 0x3; 7143 7144 /* 7145 * Find a new destination address 7146 */ 7147 /* TRACE (fin, np, l, frnat) */ 7148 DT4(ipf_nat_rewrite_2, frinfo_t *, fin, ipnat_t *, np, int, l, frinfo_t *, &frnat); 7149 7150 if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr, 7151 &frnat.fin_daddr) == -1) 7152 return -1; 7153 if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 7154 dst_search = 0; 7155 if (np->in_stepnext == 2) 7156 np->in_stepnext = 3; 7157 7158 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) { 7159 dst_search = 0; 7160 if (np->in_stepnext == 2) 7161 np->in_stepnext = 3; 7162 7163 } else if (np->in_ndstmsk == 0xffffffff) { 7164 dst_search = 0; 7165 if (np->in_stepnext == 2) 7166 np->in_stepnext = 3; 7167 7168 } else if (np->in_ndstmsk != 0xffffffff) { 7169 if ((np->in_stepnext == 2) && (changed == -1) && 7170 (natl != NULL)) { 7171 changed = 2; 7172 np->in_stepnext++; 7173 np->in_dnip++; 7174 } 7175 } 7176 7177 if ((flags & IPN_TCPUDPICMP) != 0) { 7178 if (np->in_dpnext != 0) 7179 frnat.fin_data[1] = np->in_dpnext; 7180 7181 /* 7182 * Standard port translation. Select next port. 7183 */ 7184 if ((flags & IPN_FIXEDDPORT) != 0) { 7185 np->in_stepnext = 0; 7186 } else if (np->in_stepnext == 3 && changed == -1) { 7187 np->in_dpnext++; 7188 np->in_stepnext++; 7189 changed = 3; 7190 if (np->in_dpnext > np->in_dpmax) 7191 np->in_dpnext = np->in_dpmin; 7192 } 7193 } else { 7194 if (np->in_stepnext == 3) 7195 np->in_stepnext = 0; 7196 } 7197 7198 /* TRACE (frnat) */ 7199 DT1(ipf_nat_rewrite_3, frinfo_t *, &frnat); 7200 7201 /* 7202 * Here we do a lookup of the connection as seen from 7203 * the outside. If an IP# pair already exists, try 7204 * again. So if you have A->B becomes C->B, you can 7205 * also have D->E become C->E but not D->B causing 7206 * another C->B. Also take protocol and ports into 7207 * account when determining whether a pre-existing 7208 * NAT setup will cause an external conflict where 7209 * this is appropriate. 7210 * 7211 * fin_data[] is swapped around because we are doing a 7212 * lookup of the packet is if it were moving in the opposite 7213 * direction of the one we are working with now. 7214 */ 7215 if (flags & IPN_TCPUDP) { 7216 swap = frnat.fin_data[0]; 7217 frnat.fin_data[0] = frnat.fin_data[1]; 7218 frnat.fin_data[1] = swap; 7219 } 7220 if (fin->fin_out == 1) { 7221 natl = ipf_nat_inlookup(&frnat, 7222 flags & ~(SI_WILDP|NAT_SEARCH), 7223 (u_int)frnat.fin_p, 7224 frnat.fin_dst, frnat.fin_src); 7225 7226 } else { 7227 natl = ipf_nat_outlookup(&frnat, 7228 flags & ~(SI_WILDP|NAT_SEARCH), 7229 (u_int)frnat.fin_p, 7230 frnat.fin_dst, frnat.fin_src); 7231 } 7232 if (flags & IPN_TCPUDP) { 7233 swap = frnat.fin_data[0]; 7234 frnat.fin_data[0] = frnat.fin_data[1]; 7235 frnat.fin_data[1] = swap; 7236 } 7237 7238 /* TRACE natl, in_stepnext, l */ 7239 DT3(ipf_nat_rewrite_2, nat_t *, natl, ipnat_t *, np , int, l); 7240 7241 if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */ 7242 return -1; 7243 7244 np->in_stepnext &= 0x3; 7245 7246 l++; 7247 changed = -1; 7248 } while (natl != NULL); 7249 7250 nat->nat_osrcip = fin->fin_src; 7251 nat->nat_odstip = fin->fin_dst; 7252 nat->nat_nsrcip = frnat.fin_src; 7253 nat->nat_ndstip = frnat.fin_dst; 7254 7255 if ((flags & IPN_TCPUDP) != 0) { 7256 nat->nat_osport = htons(fin->fin_data[0]); 7257 nat->nat_odport = htons(fin->fin_data[1]); 7258 nat->nat_nsport = htons(frnat.fin_data[0]); 7259 nat->nat_ndport = htons(frnat.fin_data[1]); 7260 } else if ((flags & IPN_ICMPQUERY) != 0) { 7261 nat->nat_oicmpid = fin->fin_data[1]; 7262 nat->nat_nicmpid = frnat.fin_data[1]; 7263 } 7264 7265 return 0; 7266} 7267 7268 7269/* ------------------------------------------------------------------------ */ 7270/* Function: nat_newdivert */ 7271/* Returns: int - -1 == error, 0 == success */ 7272/* Parameters: fin(I) - pointer to packet information */ 7273/* nat(I) - pointer to NAT entry */ 7274/* ni(I) - pointer to structure with misc. information needed */ 7275/* to create new NAT entry. */ 7276/* Write Lock: ipf_nat */ 7277/* */ 7278/* Create a new NAT divert session as defined by the NAT rule. This is */ 7279/* somewhat different to other NAT session creation routines because we */ 7280/* do not iterate through either port numbers or IP addresses, searching */ 7281/* for a unique mapping, however, a complimentary duplicate check is made. */ 7282/* ------------------------------------------------------------------------ */ 7283static int 7284ipf_nat_newdivert(fin, nat, nai) 7285 fr_info_t *fin; 7286 nat_t *nat; 7287 natinfo_t *nai; 7288{ 7289 ipf_main_softc_t *softc = fin->fin_main_soft; 7290 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7291 fr_info_t frnat; 7292 ipnat_t *np; 7293 nat_t *natl; 7294 int p; 7295 7296 np = nai->nai_np; 7297 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 7298 7299 nat->nat_pr[0] = 0; 7300 nat->nat_osrcaddr = fin->fin_saddr; 7301 nat->nat_odstaddr = fin->fin_daddr; 7302 frnat.fin_saddr = htonl(np->in_snip); 7303 frnat.fin_daddr = htonl(np->in_dnip); 7304 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7305 nat->nat_osport = htons(fin->fin_data[0]); 7306 nat->nat_odport = htons(fin->fin_data[1]); 7307 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7308 nat->nat_oicmpid = fin->fin_data[1]; 7309 } 7310 7311 if (np->in_redir & NAT_DIVERTUDP) { 7312 frnat.fin_data[0] = np->in_spnext; 7313 frnat.fin_data[1] = np->in_dpnext; 7314 frnat.fin_flx |= FI_TCPUDP; 7315 p = IPPROTO_UDP; 7316 } else { 7317 frnat.fin_flx &= ~FI_TCPUDP; 7318 p = IPPROTO_IPIP; 7319 } 7320 7321 if (fin->fin_out == 1) { 7322 natl = ipf_nat_inlookup(&frnat, 0, p, 7323 frnat.fin_dst, frnat.fin_src); 7324 7325 } else { 7326 natl = ipf_nat_outlookup(&frnat, 0, p, 7327 frnat.fin_dst, frnat.fin_src); 7328 } 7329 7330 if (natl != NULL) { 7331 NBUMPSIDED(fin->fin_out, ns_divert_exist); 7332 DT3(ns_divert_exist, fr_info_t *, fin, nat_t *, nat, natinfo_t, nai); 7333 return -1; 7334 } 7335 7336 nat->nat_nsrcaddr = frnat.fin_saddr; 7337 nat->nat_ndstaddr = frnat.fin_daddr; 7338 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7339 nat->nat_nsport = htons(frnat.fin_data[0]); 7340 nat->nat_ndport = htons(frnat.fin_data[1]); 7341 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7342 nat->nat_nicmpid = frnat.fin_data[1]; 7343 } 7344 7345 nat->nat_pr[fin->fin_out] = fin->fin_p; 7346 nat->nat_pr[1 - fin->fin_out] = p; 7347 7348 if (np->in_redir & NAT_REDIRECT) 7349 nat->nat_dir = NAT_DIVERTIN; 7350 else 7351 nat->nat_dir = NAT_DIVERTOUT; 7352 7353 return 0; 7354} 7355 7356 7357/* ------------------------------------------------------------------------ */ 7358/* Function: nat_builddivertmp */ 7359/* Returns: int - -1 == error, 0 == success */ 7360/* Parameters: softn(I) - pointer to NAT context structure */ 7361/* np(I) - pointer to a NAT rule */ 7362/* */ 7363/* For divert rules, a skeleton packet representing what will be prepended */ 7364/* to the real packet is created. Even though we don't have the full */ 7365/* packet here, a checksum is calculated that we update later when we */ 7366/* fill in the final details. At present a 0 checksum for UDP is being set */ 7367/* here because it is expected that divert will be used for localhost. */ 7368/* ------------------------------------------------------------------------ */ 7369static int 7370ipf_nat_builddivertmp(softn, np) 7371 ipf_nat_softc_t *softn; 7372 ipnat_t *np; 7373{ 7374 udphdr_t *uh; 7375 size_t len; 7376 ip_t *ip; 7377 7378 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7379 len = sizeof(ip_t) + sizeof(udphdr_t); 7380 else 7381 len = sizeof(ip_t); 7382 7383 ALLOC_MB_T(np->in_divmp, len); 7384 if (np->in_divmp == NULL) { 7385 NBUMPD(ipf_nat_stats, ns_divert_build); 7386 return -1; 7387 } 7388 7389 /* 7390 * First, the header to get the packet diverted to the new destination 7391 */ 7392 ip = MTOD(np->in_divmp, ip_t *); 7393 IP_V_A(ip, 4); 7394 IP_HL_A(ip, 5); 7395 ip->ip_tos = 0; 7396 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7397 ip->ip_p = IPPROTO_UDP; 7398 else 7399 ip->ip_p = IPPROTO_IPIP; 7400 ip->ip_ttl = 255; 7401 ip->ip_off = 0; 7402 ip->ip_sum = 0; 7403 ip->ip_len = htons(len); 7404 ip->ip_id = 0; 7405 ip->ip_src.s_addr = htonl(np->in_snip); 7406 ip->ip_dst.s_addr = htonl(np->in_dnip); 7407 ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip)); 7408 7409 if (np->in_redir & NAT_DIVERTUDP) { 7410 uh = (udphdr_t *)(ip + 1); 7411 uh->uh_sum = 0; 7412 uh->uh_ulen = 8; 7413 uh->uh_sport = htons(np->in_spnext); 7414 uh->uh_dport = htons(np->in_dpnext); 7415 } 7416 7417 return 0; 7418} 7419 7420 7421#define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t)) 7422 7423/* ------------------------------------------------------------------------ */ 7424/* Function: nat_decap */ 7425/* Returns: int - -1 == error, 0 == success */ 7426/* Parameters: fin(I) - pointer to packet information */ 7427/* nat(I) - pointer to current NAT session */ 7428/* */ 7429/* This function is responsible for undoing a packet's encapsulation in the */ 7430/* reverse of an encap/divert rule. After removing the outer encapsulation */ 7431/* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/ 7432/* match the "new" packet as it may still be used by IPFilter elsewhere. */ 7433/* We use "dir" here as the basis for some of the expectations about the */ 7434/* outer header. If we return an error, the goal is to leave the original */ 7435/* packet information undisturbed - this falls short at the end where we'd */ 7436/* need to back a backup copy of "fin" - expensive. */ 7437/* ------------------------------------------------------------------------ */ 7438static int 7439ipf_nat_decap(fin, nat) 7440 fr_info_t *fin; 7441 nat_t *nat; 7442{ 7443 ipf_main_softc_t *softc = fin->fin_main_soft; 7444 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7445 char *hdr; 7446 int hlen; 7447 int skip; 7448 mb_t *m; 7449 7450 if ((fin->fin_flx & FI_ICMPERR) != 0) { 7451 /* 7452 * ICMP packets don't get decapsulated, instead what we need 7453 * to do is change the ICMP reply from including (in the data 7454 * portion for errors) the encapsulated packet that we sent 7455 * out to something that resembles the original packet prior 7456 * to encapsulation. This isn't done here - all we're doing 7457 * here is changing the outer address to ensure that it gets 7458 * targetted back to the correct system. 7459 */ 7460 7461 if (nat->nat_dir & NAT_OUTBOUND) { 7462 u_32_t sum1, sum2, sumd; 7463 7464 sum1 = ntohl(fin->fin_daddr); 7465 sum2 = ntohl(nat->nat_osrcaddr); 7466 CALC_SUMD(sum1, sum2, sumd); 7467 fin->fin_ip->ip_dst = nat->nat_osrcip; 7468 fin->fin_daddr = nat->nat_osrcaddr; 7469#if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 7470 defined(__osf__) || defined(linux) 7471 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0); 7472#endif 7473 } 7474 return 0; 7475 } 7476 7477 m = fin->fin_m; 7478 skip = fin->fin_hlen; 7479 7480 switch (nat->nat_dir) 7481 { 7482 case NAT_DIVERTIN : 7483 case NAT_DIVERTOUT : 7484 if (fin->fin_plen < MINDECAP) 7485 return -1; 7486 skip += sizeof(udphdr_t); 7487 break; 7488 7489 case NAT_ENCAPIN : 7490 case NAT_ENCAPOUT : 7491 if (fin->fin_plen < (skip + sizeof(ip_t))) 7492 return -1; 7493 break; 7494 default : 7495 return -1; 7496 /* NOTREACHED */ 7497 } 7498 7499 /* 7500 * The aim here is to keep the original packet details in "fin" for 7501 * as long as possible so that returning with an error is for the 7502 * original packet and there is little undoing work to do. 7503 */ 7504 if (M_LEN(m) < skip + sizeof(ip_t)) { 7505 if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1) 7506 return -1; 7507 } 7508 7509 hdr = MTOD(fin->fin_m, char *); 7510 fin->fin_ip = (ip_t *)(hdr + skip); 7511 hlen = IP_HL(fin->fin_ip) << 2; 7512 7513 if (ipf_pr_pullup(fin, skip + hlen) == -1) { 7514 NBUMPSIDED(fin->fin_out, ns_decap_pullup); 7515 return -1; 7516 } 7517 7518 fin->fin_hlen = hlen; 7519 fin->fin_dlen -= skip; 7520 fin->fin_plen -= skip; 7521 fin->fin_ipoff += skip; 7522 7523 if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) { 7524 NBUMPSIDED(fin->fin_out, ns_decap_bad); 7525 return -1; 7526 } 7527 7528 return skip; 7529} 7530 7531 7532/* ------------------------------------------------------------------------ */ 7533/* Function: nat_nextaddr */ 7534/* Returns: int - -1 == bad input (no new address), */ 7535/* 0 == success and dst has new address */ 7536/* Parameters: fin(I) - pointer to packet information */ 7537/* na(I) - how to generate new address */ 7538/* old(I) - original address being replaced */ 7539/* dst(O) - where to put the new address */ 7540/* Write Lock: ipf_nat */ 7541/* */ 7542/* This function uses the contents of the "na" structure, in combination */ 7543/* with "old" to produce a new address to store in "dst". Not all of the */ 7544/* possible uses of "na" will result in a new address. */ 7545/* ------------------------------------------------------------------------ */ 7546static int 7547ipf_nat_nextaddr(fin, na, old, dst) 7548 fr_info_t *fin; 7549 nat_addr_t *na; 7550 u_32_t *old, *dst; 7551{ 7552 ipf_main_softc_t *softc = fin->fin_main_soft; 7553 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7554 u_32_t amin, amax, new; 7555 i6addr_t newip; 7556 int error; 7557 7558 new = 0; 7559 amin = na->na_addr[0].in4.s_addr; 7560 7561 switch (na->na_atype) 7562 { 7563 case FRI_RANGE : 7564 amax = na->na_addr[1].in4.s_addr; 7565 break; 7566 7567 case FRI_NETMASKED : 7568 case FRI_DYNAMIC : 7569 case FRI_NORMAL : 7570 /* 7571 * Compute the maximum address by adding the inverse of the 7572 * netmask to the minimum address. 7573 */ 7574 amax = ~na->na_addr[1].in4.s_addr; 7575 amax |= amin; 7576 break; 7577 7578 case FRI_LOOKUP : 7579 break; 7580 7581 case FRI_BROADCAST : 7582 case FRI_PEERADDR : 7583 case FRI_NETWORK : 7584 default : 7585 DT4(ns_na_atype, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new); 7586 return -1; 7587 } 7588 7589 error = -1; 7590 7591 if (na->na_atype == FRI_LOOKUP) { 7592 if (na->na_type == IPLT_DSTLIST) { 7593 error = ipf_dstlist_select_node(fin, na->na_ptr, dst, 7594 NULL); 7595 } else { 7596 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7597 DT4(ns_badnextaddr_1, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new); 7598 } 7599 7600 } else if (na->na_atype == IPLT_NONE) { 7601 /* 7602 * 0/0 as the new address means leave it alone. 7603 */ 7604 if (na->na_addr[0].in4.s_addr == 0 && 7605 na->na_addr[1].in4.s_addr == 0) { 7606 new = *old; 7607 7608 /* 7609 * 0/32 means get the interface's address 7610 */ 7611 } else if (na->na_addr[0].in4.s_addr == 0 && 7612 na->na_addr[1].in4.s_addr == 0xffffffff) { 7613 if (ipf_ifpaddr(softc, 4, na->na_atype, 7614 fin->fin_ifp, &newip, NULL) == -1) { 7615 NBUMPSIDED(fin->fin_out, ns_ifpaddrfail); 7616 DT4(ns_ifpaddrfail, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new); 7617 return -1; 7618 } 7619 new = newip.in4.s_addr; 7620 } else { 7621 new = htonl(na->na_nextip); 7622 } 7623 *dst = new; 7624 error = 0; 7625 7626 } else { 7627 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7628 DT4(ns_badnextaddr_2, fr_info_t *, fin, nat_addr_t *, na, u_32_t *, old, u_32_t *, new); 7629 } 7630 7631 return error; 7632} 7633 7634 7635/* ------------------------------------------------------------------------ */ 7636/* Function: nat_nextaddrinit */ 7637/* Returns: int - 0 == success, else error number */ 7638/* Parameters: softc(I) - pointer to soft context main structure */ 7639/* na(I) - NAT address information for generating new addr*/ 7640/* initial(I) - flag indicating if it is the first call for */ 7641/* this "na" structure. */ 7642/* ifp(I) - network interface to derive address */ 7643/* information from. */ 7644/* */ 7645/* This function is expected to be called in two scenarious: when a new NAT */ 7646/* rule is loaded into the kernel and when the list of NAT rules is sync'd */ 7647/* up with the valid network interfaces (possibly due to them changing.) */ 7648/* To distinguish between these, the "initial" parameter is used. If it is */ 7649/* 1 then this indicates the rule has just been reloaded and 0 for when we */ 7650/* are updating information. This difference is important because in */ 7651/* instances where we are not updating address information associated with */ 7652/* a network interface, we don't want to disturb what the "next" address to */ 7653/* come out of ipf_nat_nextaddr() will be. */ 7654/* ------------------------------------------------------------------------ */ 7655static int 7656ipf_nat_nextaddrinit(softc, base, na, initial, ifp) 7657 ipf_main_softc_t *softc; 7658 char *base; 7659 nat_addr_t *na; 7660 int initial; 7661 void *ifp; 7662{ 7663 7664 switch (na->na_atype) 7665 { 7666 case FRI_LOOKUP : 7667 if (na->na_subtype == 0) { 7668 na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT, 7669 na->na_type, 7670 na->na_num, 7671 &na->na_func); 7672 } else if (na->na_subtype == 1) { 7673 na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT, 7674 na->na_type, 7675 base + na->na_num, 7676 &na->na_func); 7677 } 7678 if (na->na_func == NULL) { 7679 IPFERROR(60060); 7680 return ESRCH; 7681 } 7682 if (na->na_ptr == NULL) { 7683 IPFERROR(60056); 7684 return ESRCH; 7685 } 7686 break; 7687 7688 case FRI_DYNAMIC : 7689 case FRI_BROADCAST : 7690 case FRI_NETWORK : 7691 case FRI_NETMASKED : 7692 case FRI_PEERADDR : 7693 if (ifp != NULL) 7694 (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp, 7695 &na->na_addr[0], &na->na_addr[1]); 7696 break; 7697 7698 case FRI_SPLIT : 7699 case FRI_RANGE : 7700 if (initial) 7701 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7702 break; 7703 7704 case FRI_NONE : 7705 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7706 return 0; 7707 7708 case FRI_NORMAL : 7709 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7710 break; 7711 7712 default : 7713 IPFERROR(60054); 7714 return EINVAL; 7715 } 7716 7717 if (initial && (na->na_atype == FRI_NORMAL)) { 7718 if (na->na_addr[0].in4.s_addr == 0) { 7719 if ((na->na_addr[1].in4.s_addr == 0xffffffff) || 7720 (na->na_addr[1].in4.s_addr == 0)) { 7721 return 0; 7722 } 7723 } 7724 7725 if (na->na_addr[1].in4.s_addr == 0xffffffff) { 7726 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7727 } else { 7728 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1; 7729 } 7730 } 7731 7732 return 0; 7733} 7734 7735 7736/* ------------------------------------------------------------------------ */ 7737/* Function: ipf_nat_matchflush */ 7738/* Returns: int - -1 == error, 0 == success */ 7739/* Parameters: softc(I) - pointer to soft context main structure */ 7740/* softn(I) - pointer to NAT context structure */ 7741/* nat(I) - pointer to current NAT session */ 7742/* */ 7743/* ------------------------------------------------------------------------ */ 7744static int 7745ipf_nat_matchflush(softc, softn, data) 7746 ipf_main_softc_t *softc; 7747 ipf_nat_softc_t *softn; 7748 caddr_t data; 7749{ 7750 int *array, flushed, error; 7751 nat_t *nat, *natnext; 7752 ipfobj_t obj; 7753 7754 error = ipf_matcharray_load(softc, data, &obj, &array); 7755 if (error != 0) 7756 return error; 7757 7758 flushed = 0; 7759 7760 for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) { 7761 natnext = nat->nat_next; 7762 if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) { 7763 ipf_nat_delete(softc, nat, NL_FLUSH); 7764 flushed++; 7765 } 7766 } 7767 7768 obj.ipfo_retval = flushed; 7769 error = BCOPYOUT(&obj, data, sizeof(obj)); 7770 7771 KFREES(array, array[0] * sizeof(*array)); 7772 7773 return error; 7774} 7775 7776 7777/* ------------------------------------------------------------------------ */ 7778/* Function: ipf_nat_matcharray */ 7779/* Returns: int - -1 == error, 0 == success */ 7780/* Parameters: fin(I) - pointer to packet information */ 7781/* nat(I) - pointer to current NAT session */ 7782/* */ 7783/* ------------------------------------------------------------------------ */ 7784static int 7785ipf_nat_matcharray(nat, array, ticks) 7786 nat_t *nat; 7787 int *array; 7788 u_long ticks; 7789{ 7790 int i, n, *x, e, p; 7791 7792 e = 0; 7793 n = array[0]; 7794 x = array + 1; 7795 7796 for (; n > 0; x += 3 + x[2]) { 7797 if (x[0] == IPF_EXP_END) 7798 break; 7799 e = 0; 7800 7801 n -= x[2] + 3; 7802 if (n < 0) 7803 break; 7804 7805 p = x[0] >> 16; 7806 if (p != 0 && p != nat->nat_pr[1]) 7807 break; 7808 7809 switch (x[0]) 7810 { 7811 case IPF_EXP_IP_PR : 7812 for (i = 0; !e && i < x[2]; i++) { 7813 e |= (nat->nat_pr[1] == x[i + 3]); 7814 } 7815 break; 7816 7817 case IPF_EXP_IP_SRCADDR : 7818 if (nat->nat_v[0] == 4) { 7819 for (i = 0; !e && i < x[2]; i++) { 7820 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7821 x[i + 3]); 7822 } 7823 } 7824 if (nat->nat_v[1] == 4) { 7825 for (i = 0; !e && i < x[2]; i++) { 7826 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7827 x[i + 3]); 7828 } 7829 } 7830 break; 7831 7832 case IPF_EXP_IP_DSTADDR : 7833 if (nat->nat_v[0] == 4) { 7834 for (i = 0; !e && i < x[2]; i++) { 7835 e |= ((nat->nat_odstaddr & x[i + 4]) == 7836 x[i + 3]); 7837 } 7838 } 7839 if (nat->nat_v[1] == 4) { 7840 for (i = 0; !e && i < x[2]; i++) { 7841 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7842 x[i + 3]); 7843 } 7844 } 7845 break; 7846 7847 case IPF_EXP_IP_ADDR : 7848 for (i = 0; !e && i < x[2]; i++) { 7849 if (nat->nat_v[0] == 4) { 7850 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7851 x[i + 3]); 7852 } 7853 if (nat->nat_v[1] == 4) { 7854 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7855 x[i + 3]); 7856 } 7857 if (nat->nat_v[0] == 4) { 7858 e |= ((nat->nat_odstaddr & x[i + 4]) == 7859 x[i + 3]); 7860 } 7861 if (nat->nat_v[1] == 4) { 7862 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7863 x[i + 3]); 7864 } 7865 } 7866 break; 7867 7868#ifdef USE_INET6 7869 case IPF_EXP_IP6_SRCADDR : 7870 if (nat->nat_v[0] == 6) { 7871 for (i = 0; !e && i < x[3]; i++) { 7872 e |= IP6_MASKEQ(&nat->nat_osrc6, 7873 x + i + 7, x + i + 3); 7874 } 7875 } 7876 if (nat->nat_v[1] == 6) { 7877 for (i = 0; !e && i < x[3]; i++) { 7878 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7879 x + i + 7, x + i + 3); 7880 } 7881 } 7882 break; 7883 7884 case IPF_EXP_IP6_DSTADDR : 7885 if (nat->nat_v[0] == 6) { 7886 for (i = 0; !e && i < x[3]; i++) { 7887 e |= IP6_MASKEQ(&nat->nat_odst6, 7888 x + i + 7, 7889 x + i + 3); 7890 } 7891 } 7892 if (nat->nat_v[1] == 6) { 7893 for (i = 0; !e && i < x[3]; i++) { 7894 e |= IP6_MASKEQ(&nat->nat_ndst6, 7895 x + i + 7, 7896 x + i + 3); 7897 } 7898 } 7899 break; 7900 7901 case IPF_EXP_IP6_ADDR : 7902 for (i = 0; !e && i < x[3]; i++) { 7903 if (nat->nat_v[0] == 6) { 7904 e |= IP6_MASKEQ(&nat->nat_osrc6, 7905 x + i + 7, 7906 x + i + 3); 7907 } 7908 if (nat->nat_v[0] == 6) { 7909 e |= IP6_MASKEQ(&nat->nat_odst6, 7910 x + i + 7, 7911 x + i + 3); 7912 } 7913 if (nat->nat_v[1] == 6) { 7914 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7915 x + i + 7, 7916 x + i + 3); 7917 } 7918 if (nat->nat_v[1] == 6) { 7919 e |= IP6_MASKEQ(&nat->nat_ndst6, 7920 x + i + 7, 7921 x + i + 3); 7922 } 7923 } 7924 break; 7925#endif 7926 7927 case IPF_EXP_UDP_PORT : 7928 case IPF_EXP_TCP_PORT : 7929 for (i = 0; !e && i < x[2]; i++) { 7930 e |= (nat->nat_nsport == x[i + 3]) || 7931 (nat->nat_ndport == x[i + 3]); 7932 } 7933 break; 7934 7935 case IPF_EXP_UDP_SPORT : 7936 case IPF_EXP_TCP_SPORT : 7937 for (i = 0; !e && i < x[2]; i++) { 7938 e |= (nat->nat_nsport == x[i + 3]); 7939 } 7940 break; 7941 7942 case IPF_EXP_UDP_DPORT : 7943 case IPF_EXP_TCP_DPORT : 7944 for (i = 0; !e && i < x[2]; i++) { 7945 e |= (nat->nat_ndport == x[i + 3]); 7946 } 7947 break; 7948 7949 case IPF_EXP_TCP_STATE : 7950 for (i = 0; !e && i < x[2]; i++) { 7951 e |= (nat->nat_tcpstate[0] == x[i + 3]) || 7952 (nat->nat_tcpstate[1] == x[i + 3]); 7953 } 7954 break; 7955 7956 case IPF_EXP_IDLE_GT : 7957 e |= (ticks - nat->nat_touched > x[3]); 7958 break; 7959 } 7960 e ^= x[1]; 7961 7962 if (!e) 7963 break; 7964 } 7965 7966 return e; 7967} 7968 7969 7970/* ------------------------------------------------------------------------ */ 7971/* Function: ipf_nat_gettable */ 7972/* Returns: int - 0 = success, else error */ 7973/* Parameters: softc(I) - pointer to soft context main structure */ 7974/* softn(I) - pointer to NAT context structure */ 7975/* data(I) - pointer to ioctl data */ 7976/* */ 7977/* This function handles ioctl requests for tables of nat information. */ 7978/* At present the only table it deals with is the hash bucket statistics. */ 7979/* ------------------------------------------------------------------------ */ 7980static int 7981ipf_nat_gettable(softc, softn, data) 7982 ipf_main_softc_t *softc; 7983 ipf_nat_softc_t *softn; 7984 char *data; 7985{ 7986 ipftable_t table; 7987 int error; 7988 7989 error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE); 7990 if (error != 0) 7991 return error; 7992 7993 switch (table.ita_type) 7994 { 7995 case IPFTABLE_BUCKETS_NATIN : 7996 error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 7997 table.ita_table, 7998 softn->ipf_nat_table_sz * sizeof(u_int)); 7999 break; 8000 8001 case IPFTABLE_BUCKETS_NATOUT : 8002 error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 8003 table.ita_table, 8004 softn->ipf_nat_table_sz * sizeof(u_int)); 8005 break; 8006 8007 default : 8008 IPFERROR(60058); 8009 return EINVAL; 8010 } 8011 8012 if (error != 0) { 8013 IPFERROR(60059); 8014 error = EFAULT; 8015 } 8016 return error; 8017} 8018 8019 8020/* ------------------------------------------------------------------------ */ 8021/* Function: ipf_nat_settimeout */ 8022/* Returns: int - 0 = success, else failure */ 8023/* Parameters: softc(I) - pointer to soft context main structure */ 8024/* t(I) - pointer to tunable */ 8025/* p(I) - pointer to new tuning data */ 8026/* */ 8027/* Apply the timeout change to the NAT timeout queues. */ 8028/* ------------------------------------------------------------------------ */ 8029int 8030ipf_nat_settimeout(softc, t, p) 8031 struct ipf_main_softc_s *softc; 8032 ipftuneable_t *t; 8033 ipftuneval_t *p; 8034{ 8035 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8036 8037 if (!strncmp(t->ipft_name, "tcp_", 4)) 8038 return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq); 8039 8040 if (!strcmp(t->ipft_name, "udp_timeout")) { 8041 ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int); 8042 } else if (!strcmp(t->ipft_name, "udp_ack_timeout")) { 8043 ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int); 8044 } else if (!strcmp(t->ipft_name, "icmp_timeout")) { 8045 ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int); 8046 } else if (!strcmp(t->ipft_name, "icmp_ack_timeout")) { 8047 ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int); 8048 } else if (!strcmp(t->ipft_name, "ip_timeout")) { 8049 ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int); 8050 } else { 8051 IPFERROR(60062); 8052 return ESRCH; 8053 } 8054 return 0; 8055} 8056 8057 8058/* ------------------------------------------------------------------------ */ 8059/* Function: ipf_nat_rehash */ 8060/* Returns: int - 0 = success, else failure */ 8061/* Parameters: softc(I) - pointer to soft context main structure */ 8062/* t(I) - pointer to tunable */ 8063/* p(I) - pointer to new tuning data */ 8064/* */ 8065/* To change the size of the basic NAT table, we need to first allocate the */ 8066/* new tables (lest it fails and we've got nowhere to store all of the NAT */ 8067/* sessions currently active) and then walk through the entire list and */ 8068/* insert them into the table. There are two tables here: an inbound one */ 8069/* and an outbound one. Each NAT entry goes into each table once. */ 8070/* ------------------------------------------------------------------------ */ 8071int 8072ipf_nat_rehash(softc, t, p) 8073 ipf_main_softc_t *softc; 8074 ipftuneable_t *t; 8075 ipftuneval_t *p; 8076{ 8077 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8078 nat_t **newtab[2], *nat, **natp; 8079 u_int *bucketlens[2]; 8080 u_int maxbucket; 8081 u_int newsize; 8082 int error; 8083 u_int hv; 8084 int i; 8085 8086 newsize = p->ipftu_int; 8087 /* 8088 * In case there is nothing to do... 8089 */ 8090 if (newsize == softn->ipf_nat_table_sz) 8091 return 0; 8092 8093 newtab[0] = NULL; 8094 newtab[1] = NULL; 8095 bucketlens[0] = NULL; 8096 bucketlens[1] = NULL; 8097 /* 8098 * 4 tables depend on the NAT table size: the inbound looking table, 8099 * the outbound lookup table and the hash chain length for each. 8100 */ 8101 KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *)); 8102 if (newtab == NULL) { 8103 error = 60063; 8104 goto badrehash; 8105 } 8106 8107 KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *)); 8108 if (newtab == NULL) { 8109 error = 60064; 8110 goto badrehash; 8111 } 8112 8113 KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int)); 8114 if (bucketlens[0] == NULL) { 8115 error = 60065; 8116 goto badrehash; 8117 } 8118 8119 KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int)); 8120 if (bucketlens[1] == NULL) { 8121 error = 60066; 8122 goto badrehash; 8123 } 8124 8125 /* 8126 * Recalculate the maximum length based on the new size. 8127 */ 8128 for (maxbucket = 0, i = newsize; i > 0; i >>= 1) 8129 maxbucket++; 8130 maxbucket *= 2; 8131 8132 bzero((char *)newtab[0], newsize * sizeof(nat_t *)); 8133 bzero((char *)newtab[1], newsize * sizeof(nat_t *)); 8134 bzero((char *)bucketlens[0], newsize * sizeof(u_int)); 8135 bzero((char *)bucketlens[1], newsize * sizeof(u_int)); 8136 8137 WRITE_ENTER(&softc->ipf_nat); 8138 8139 if (softn->ipf_nat_table[0] != NULL) { 8140 KFREES(softn->ipf_nat_table[0], 8141 softn->ipf_nat_table_sz * 8142 sizeof(*softn->ipf_nat_table[0])); 8143 } 8144 softn->ipf_nat_table[0] = newtab[0]; 8145 8146 if (softn->ipf_nat_table[1] != NULL) { 8147 KFREES(softn->ipf_nat_table[1], 8148 softn->ipf_nat_table_sz * 8149 sizeof(*softn->ipf_nat_table[1])); 8150 } 8151 softn->ipf_nat_table[1] = newtab[1]; 8152 8153 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 8154 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 8155 softn->ipf_nat_table_sz * sizeof(u_int)); 8156 } 8157 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0]; 8158 8159 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 8160 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 8161 softn->ipf_nat_table_sz * sizeof(u_int)); 8162 } 8163 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1]; 8164 8165#ifdef USE_INET6 8166 if (softn->ipf_nat_stats.ns_side6[0].ns_bucketlen != NULL) { 8167 KFREES(softn->ipf_nat_stats.ns_side6[0].ns_bucketlen, 8168 softn->ipf_nat_table_sz * sizeof(u_int)); 8169 } 8170 softn->ipf_nat_stats.ns_side6[0].ns_bucketlen = bucketlens[0]; 8171 8172 if (softn->ipf_nat_stats.ns_side6[1].ns_bucketlen != NULL) { 8173 KFREES(softn->ipf_nat_stats.ns_side6[1].ns_bucketlen, 8174 softn->ipf_nat_table_sz * sizeof(u_int)); 8175 } 8176 softn->ipf_nat_stats.ns_side6[1].ns_bucketlen = bucketlens[1]; 8177#endif 8178 8179 softn->ipf_nat_maxbucket = maxbucket; 8180 softn->ipf_nat_table_sz = newsize; 8181 /* 8182 * Walk through the entire list of NAT table entries and put them 8183 * in the new NAT table, somewhere. Because we have a new table, 8184 * we need to restart the counter of how many chains are in use. 8185 */ 8186 softn->ipf_nat_stats.ns_side[0].ns_inuse = 0; 8187 softn->ipf_nat_stats.ns_side[1].ns_inuse = 0; 8188#ifdef USE_INET6 8189 softn->ipf_nat_stats.ns_side6[0].ns_inuse = 0; 8190 softn->ipf_nat_stats.ns_side6[1].ns_inuse = 0; 8191#endif 8192 8193 for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) { 8194 nat->nat_hnext[0] = NULL; 8195 nat->nat_phnext[0] = NULL; 8196 hv = nat->nat_hv[0] % softn->ipf_nat_table_sz; 8197 8198 natp = &softn->ipf_nat_table[0][hv]; 8199 if (*natp) { 8200 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 8201 } else { 8202 NBUMPSIDE(0, ns_inuse); 8203 } 8204 nat->nat_phnext[0] = natp; 8205 nat->nat_hnext[0] = *natp; 8206 *natp = nat; 8207 NBUMPSIDE(0, ns_bucketlen[hv]); 8208 8209 nat->nat_hnext[1] = NULL; 8210 nat->nat_phnext[1] = NULL; 8211 hv = nat->nat_hv[1] % softn->ipf_nat_table_sz; 8212 8213 natp = &softn->ipf_nat_table[1][hv]; 8214 if (*natp) { 8215 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 8216 } else { 8217 NBUMPSIDE(1, ns_inuse); 8218 } 8219 nat->nat_phnext[1] = natp; 8220 nat->nat_hnext[1] = *natp; 8221 *natp = nat; 8222 NBUMPSIDE(1, ns_bucketlen[hv]); 8223 } 8224 RWLOCK_EXIT(&softc->ipf_nat); 8225 8226 return 0; 8227 8228badrehash: 8229 if (bucketlens[1] != NULL) { 8230 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8231 } 8232 if (bucketlens[0] != NULL) { 8233 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8234 } 8235 if (newtab[0] != NULL) { 8236 KFREES(newtab[0], newsize * sizeof(nat_t *)); 8237 } 8238 if (newtab[1] != NULL) { 8239 KFREES(newtab[1], newsize * sizeof(nat_t *)); 8240 } 8241 IPFERROR(error); 8242 return ENOMEM; 8243} 8244 8245 8246/* ------------------------------------------------------------------------ */ 8247/* Function: ipf_nat_rehash_rules */ 8248/* Returns: int - 0 = success, else failure */ 8249/* Parameters: softc(I) - pointer to soft context main structure */ 8250/* t(I) - pointer to tunable */ 8251/* p(I) - pointer to new tuning data */ 8252/* */ 8253/* All of the NAT rules hang off of a hash table that is searched with a */ 8254/* hash on address after the netmask is applied. There is a different table*/ 8255/* for both inbound rules (rdr) and outbound (map.) The resizing will only */ 8256/* affect one of these two tables. */ 8257/* ------------------------------------------------------------------------ */ 8258int 8259ipf_nat_rehash_rules(softc, t, p) 8260 ipf_main_softc_t *softc; 8261 ipftuneable_t *t; 8262 ipftuneval_t *p; 8263{ 8264 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8265 ipnat_t **newtab, *np, ***old, **npp; 8266 u_int newsize; 8267 u_int mask; 8268 u_int hv; 8269 8270 newsize = p->ipftu_int; 8271 /* 8272 * In case there is nothing to do... 8273 */ 8274 if (newsize == *t->ipft_pint) 8275 return 0; 8276 8277 /* 8278 * All inbound rules have the NAT_REDIRECT bit set in in_redir and 8279 * all outbound rules have either NAT_MAP or MAT_MAPBLK set. 8280 * This if statement allows for some more generic code to be below, 8281 * rather than two huge gobs of code that almost do the same thing. 8282 */ 8283 if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) { 8284 old = &softn->ipf_nat_rdr_rules; 8285 mask = NAT_REDIRECT; 8286 } else { 8287 old = &softn->ipf_nat_map_rules; 8288 mask = NAT_MAP|NAT_MAPBLK; 8289 } 8290 8291 KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *)); 8292 if (newtab == NULL) { 8293 IPFERROR(60067); 8294 return ENOMEM; 8295 } 8296 8297 bzero((char *)newtab, newsize * sizeof(ipnat_t *)); 8298 8299 WRITE_ENTER(&softc->ipf_nat); 8300 8301 if (*old != NULL) { 8302 KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **)); 8303 } 8304 *old = newtab; 8305 *t->ipft_pint = newsize; 8306 8307 for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) { 8308 if ((np->in_redir & mask) == 0) 8309 continue; 8310 8311 if (np->in_redir & NAT_REDIRECT) { 8312 np->in_rnext = NULL; 8313 hv = np->in_hv[0] % newsize; 8314 for (npp = newtab + hv; *npp != NULL; ) 8315 npp = &(*npp)->in_rnext; 8316 np->in_prnext = npp; 8317 *npp = np; 8318 } 8319 if (np->in_redir & NAT_MAP) { 8320 np->in_mnext = NULL; 8321 hv = np->in_hv[1] % newsize; 8322 for (npp = newtab + hv; *npp != NULL; ) 8323 npp = &(*npp)->in_mnext; 8324 np->in_pmnext = npp; 8325 *npp = np; 8326 } 8327 8328 } 8329 RWLOCK_EXIT(&softc->ipf_nat); 8330 8331 return 0; 8332} 8333 8334 8335/* ------------------------------------------------------------------------ */ 8336/* Function: ipf_nat_hostmap_rehash */ 8337/* Returns: int - 0 = success, else failure */ 8338/* Parameters: softc(I) - pointer to soft context main structure */ 8339/* t(I) - pointer to tunable */ 8340/* p(I) - pointer to new tuning data */ 8341/* */ 8342/* Allocate and populate a new hash table that will contain a reference to */ 8343/* all of the active IP# translations currently in place. */ 8344/* ------------------------------------------------------------------------ */ 8345int 8346ipf_nat_hostmap_rehash(softc, t, p) 8347 ipf_main_softc_t *softc; 8348 ipftuneable_t *t; 8349 ipftuneval_t *p; 8350{ 8351 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8352 hostmap_t *hm, **newtab; 8353 u_int newsize; 8354 u_int hv; 8355 8356 newsize = p->ipftu_int; 8357 /* 8358 * In case there is nothing to do... 8359 */ 8360 if (newsize == *t->ipft_pint) 8361 return 0; 8362 8363 KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *)); 8364 if (newtab == NULL) { 8365 IPFERROR(60068); 8366 return ENOMEM; 8367 } 8368 8369 bzero((char *)newtab, newsize * sizeof(hostmap_t *)); 8370 8371 WRITE_ENTER(&softc->ipf_nat); 8372 if (softn->ipf_hm_maptable != NULL) { 8373 KFREES(softn->ipf_hm_maptable, 8374 softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *)); 8375 } 8376 softn->ipf_hm_maptable = newtab; 8377 softn->ipf_nat_hostmap_sz = newsize; 8378 8379 for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) { 8380 hv = hm->hm_hv % softn->ipf_nat_hostmap_sz; 8381 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 8382 hm->hm_phnext = softn->ipf_hm_maptable + hv; 8383 if (softn->ipf_hm_maptable[hv] != NULL) 8384 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 8385 softn->ipf_hm_maptable[hv] = hm; 8386 } 8387 RWLOCK_EXIT(&softc->ipf_nat); 8388 8389 return 0; 8390} 8391 8392 8393/* ------------------------------------------------------------------------ */ 8394/* Function: ipf_nat_add_tq */ 8395/* Parameters: softc(I) - pointer to soft context main structure */ 8396/* */ 8397/* ------------------------------------------------------------------------ */ 8398ipftq_t * 8399ipf_nat_add_tq(softc, ttl) 8400 ipf_main_softc_t *softc; 8401 int ttl; 8402{ 8403 ipf_nat_softc_t *softs = softc->ipf_nat_soft; 8404 8405 return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl); 8406} 8407 8408/* ------------------------------------------------------------------------ */ 8409/* Function: ipf_nat_uncreate */ 8410/* Returns: Nil */ 8411/* Parameters: fin(I) - pointer to packet information */ 8412/* */ 8413/* This function is used to remove a NAT entry from the NAT table when we */ 8414/* decide that the create was actually in error. It is thus assumed that */ 8415/* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */ 8416/* with the translated packet (not the original), we have to reverse the */ 8417/* lookup. Although doing the lookup is expensive (relatively speaking), it */ 8418/* is not anticipated that this will be a frequent occurance for normal */ 8419/* traffic patterns. */ 8420/* ------------------------------------------------------------------------ */ 8421void 8422ipf_nat_uncreate(fin) 8423 fr_info_t *fin; 8424{ 8425 ipf_main_softc_t *softc = fin->fin_main_soft; 8426 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8427 int nflags; 8428 nat_t *nat; 8429 8430 switch (fin->fin_p) 8431 { 8432 case IPPROTO_TCP : 8433 nflags = IPN_TCP; 8434 break; 8435 case IPPROTO_UDP : 8436 nflags = IPN_UDP; 8437 break; 8438 default : 8439 nflags = 0; 8440 break; 8441 } 8442 8443 WRITE_ENTER(&softc->ipf_nat); 8444 8445 if (fin->fin_out == 0) { 8446 nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 8447 fin->fin_dst, fin->fin_src); 8448 } else { 8449 nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 8450 fin->fin_src, fin->fin_dst); 8451 } 8452 8453 if (nat != NULL) { 8454 NBUMPSIDE(fin->fin_out, ns_uncreate[0]); 8455 ipf_nat_delete(softc, nat, NL_DESTROY); 8456 } else { 8457 NBUMPSIDE(fin->fin_out, ns_uncreate[1]); 8458 } 8459 8460 RWLOCK_EXIT(&softc->ipf_nat); 8461} 8462 8463 8464/* ------------------------------------------------------------------------ */ 8465/* Function: ipf_nat_cmp_rules */ 8466/* Returns: int - 0 == success, else rules do not match. */ 8467/* Parameters: n1(I) - first rule to compare */ 8468/* n2(I) - first rule to compare */ 8469/* */ 8470/* Compare two rules using pointers to each rule. A straight bcmp will not */ 8471/* work as some fields (such as in_dst, in_pkts) actually do change once */ 8472/* the rule has been loaded into the kernel. Whilst this function returns */ 8473/* various non-zero returns, they're strictly to aid in debugging. Use of */ 8474/* this function should simply care if the result is zero or not. */ 8475/* ------------------------------------------------------------------------ */ 8476static int 8477ipf_nat_cmp_rules(n1, n2) 8478 ipnat_t *n1, *n2; 8479{ 8480 if (n1->in_size != n2->in_size) 8481 return 1; 8482 8483 if (bcmp((char *)&n1->in_v, (char *)&n2->in_v, 8484 offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0) 8485 return 2; 8486 8487 if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc, 8488 n1->in_size - offsetof(ipnat_t, in_tuc)) != 0) 8489 return 3; 8490 if (n1->in_ndst.na_atype != n2->in_ndst.na_atype) 8491 return 5; 8492 if (n1->in_ndst.na_function != n2->in_ndst.na_function) 8493 return 6; 8494 if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr, 8495 sizeof(n1->in_ndst.na_addr))) 8496 return 7; 8497 if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype) 8498 return 8; 8499 if (n1->in_nsrc.na_function != n2->in_nsrc.na_function) 8500 return 9; 8501 if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr, 8502 sizeof(n1->in_nsrc.na_addr))) 8503 return 10; 8504 if (n1->in_odst.na_atype != n2->in_odst.na_atype) 8505 return 11; 8506 if (n1->in_odst.na_function != n2->in_odst.na_function) 8507 return 12; 8508 if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr, 8509 sizeof(n1->in_odst.na_addr))) 8510 return 13; 8511 if (n1->in_osrc.na_atype != n2->in_osrc.na_atype) 8512 return 14; 8513 if (n1->in_osrc.na_function != n2->in_osrc.na_function) 8514 return 15; 8515 if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr, 8516 sizeof(n1->in_osrc.na_addr))) 8517 return 16; 8518 return 0; 8519} 8520 8521 8522/* ------------------------------------------------------------------------ */ 8523/* Function: ipf_nat_rule_init */ 8524/* Returns: int - 0 == success, else rules do not match. */ 8525/* Parameters: softc(I) - pointer to soft context main structure */ 8526/* softn(I) - pointer to NAT context structure */ 8527/* n(I) - first rule to compare */ 8528/* */ 8529/* ------------------------------------------------------------------------ */ 8530static int 8531ipf_nat_rule_init(softc, softn, n) 8532 ipf_main_softc_t *softc; 8533 ipf_nat_softc_t *softn; 8534 ipnat_t *n; 8535{ 8536 int error = 0; 8537 8538 if ((n->in_flags & IPN_SIPRANGE) != 0) 8539 n->in_nsrcatype = FRI_RANGE; 8540 8541 if ((n->in_flags & IPN_DIPRANGE) != 0) 8542 n->in_ndstatype = FRI_RANGE; 8543 8544 if ((n->in_flags & IPN_SPLIT) != 0) 8545 n->in_ndstatype = FRI_SPLIT; 8546 8547 if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0) 8548 n->in_spnext = n->in_spmin; 8549 8550 if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) { 8551 n->in_dpnext = n->in_dpmin; 8552 } else if (n->in_redir == NAT_REDIRECT) { 8553 n->in_dpnext = n->in_dpmin; 8554 } 8555 8556 n->in_stepnext = 0; 8557 8558 switch (n->in_v[0]) 8559 { 8560 case 4 : 8561 error = ipf_nat_ruleaddrinit(softc, softn, n); 8562 if (error != 0) 8563 return error; 8564 break; 8565#ifdef USE_INET6 8566 case 6 : 8567 error = ipf_nat6_ruleaddrinit(softc, softn, n); 8568 if (error != 0) 8569 return error; 8570 break; 8571#endif 8572 default : 8573 break; 8574 } 8575 8576 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 8577 /* 8578 * Prerecord whether or not the destination of the divert 8579 * is local or not to the interface the packet is going 8580 * to be sent out. 8581 */ 8582 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 8583 n->in_ifps[1], &n->in_ndstip6); 8584 } 8585 8586 return error; 8587} 8588 8589 8590/* ------------------------------------------------------------------------ */ 8591/* Function: ipf_nat_rule_fini */ 8592/* Returns: int - 0 == success, else rules do not match. */ 8593/* Parameters: softc(I) - pointer to soft context main structure */ 8594/* n(I) - rule to work on */ 8595/* */ 8596/* This function is used to release any objects that were referenced during */ 8597/* the rule initialisation. This is useful both when free'ing the rule and */ 8598/* when handling ioctls that need to initialise these fields but not */ 8599/* actually use them after the ioctl processing has finished. */ 8600/* ------------------------------------------------------------------------ */ 8601static void 8602ipf_nat_rule_fini(softc, n) 8603 ipf_main_softc_t *softc; 8604 ipnat_t *n; 8605{ 8606 if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL) 8607 ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr); 8608 8609 if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL) 8610 ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr); 8611 8612 if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL) 8613 ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr); 8614 8615 if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL) 8616 ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr); 8617 8618 if (n->in_divmp != NULL) 8619 FREE_MB_T(n->in_divmp); 8620} 8621