ip_nat.c revision 1.18
1 /* $NetBSD: ip_nat.c,v 1.18 2017/07/01 16:34:17 khorben Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 */ 8 #if defined(KERNEL) || defined(_KERNEL) 9 # undef KERNEL 10 # undef KERNEL 11 # define KERNEL 1 12 # define KERNEL 1 13 #endif 14 #include <sys/errno.h> 15 #include <sys/types.h> 16 #include <sys/param.h> 17 #include <sys/time.h> 18 #include <sys/file.h> 19 #if defined(_KERNEL) && \ 20 (defined(__NetBSD_Version) && (__NetBSD_Version >= 399002000)) 21 # include <sys/kauth.h> 22 #endif 23 #if !defined(_KERNEL) 24 # include <stdio.h> 25 # include <string.h> 26 # include <stdlib.h> 27 # define KERNEL 28 # ifdef _OpenBSD__ 29 struct file; 30 # endif 31 # include <sys/uio.h> 32 # undef KERNEL 33 #endif 34 #if defined(_KERNEL) && \ 35 defined(__FreeBSD_version) && (__FreeBSD_version >= 220000) 36 # include <sys/filio.h> 37 # include <sys/fcntl.h> 38 #else 39 # include <sys/ioctl.h> 40 #endif 41 #if !defined(AIX) 42 # include <sys/fcntl.h> 43 #endif 44 #if !defined(linux) 45 # include <sys/protosw.h> 46 #endif 47 #include <sys/socket.h> 48 #if defined(_KERNEL) 49 # include <sys/systm.h> 50 # if !defined(__SVR4) && !defined(__svr4__) 51 # include <sys/mbuf.h> 52 # endif 53 #endif 54 #if defined(__SVR4) || defined(__svr4__) 55 # include <sys/filio.h> 56 # include <sys/byteorder.h> 57 # ifdef KERNEL 58 # include <sys/dditypes.h> 59 # endif 60 # include <sys/stream.h> 61 # include <sys/kmem.h> 62 #endif 63 #if _FreeBSD_version >= 300000 64 # include <sys/queue.h> 65 #endif 66 #include <net/if.h> 67 #if _FreeBSD_version >= 300000 68 # include <net/if_var.h> 69 #endif 70 #ifdef sun 71 # include <net/af.h> 72 #endif 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/ip.h> 76 77 #ifdef RFC1825 78 # include <vpn/md5.h> 79 # include <vpn/ipsec.h> 80 extern struct ifnet vpnif; 81 #endif 82 83 #if !defined(linux) 84 # include <netinet/ip_var.h> 85 #endif 86 #include <netinet/tcp.h> 87 #include <netinet/udp.h> 88 #include <netinet/ip_icmp.h> 89 #include "netinet/ip_compat.h" 90 #include <netinet/tcpip.h> 91 #include "netinet/ipl.h" 92 #include "netinet/ip_fil.h" 93 #include "netinet/ip_nat.h" 94 #include "netinet/ip_frag.h" 95 #include "netinet/ip_state.h" 96 #include "netinet/ip_proxy.h" 97 #include "netinet/ip_lookup.h" 98 #include "netinet/ip_dstlist.h" 99 #include "netinet/ip_sync.h" 100 #if FREEBSD_GE_REV(300000) 101 # include <sys/malloc.h> 102 #endif 103 #ifdef HAS_SYS_MD5_H 104 # include <sys/md5.h> 105 #else 106 # include "md5.h" 107 #endif 108 /* END OF INCLUDES */ 109 110 #undef SOCKADDR_IN 111 #define SOCKADDR_IN struct sockaddr_in 112 113 #if !defined(lint) 114 #if defined(__NetBSD__) 115 #include <sys/cdefs.h> 116 __KERNEL_RCSID(0, "$NetBSD: ip_nat.c,v 1.18 2017/07/01 16:34:17 khorben Exp $"); 117 #else 118 static const char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed"; 119 static const char rcsid[] = "@(#)Id: ip_nat.c,v 1.1.1.2 2012/07/22 13:45:27 darrenr Exp"; 120 #endif 121 #endif 122 123 124 #define NATFSUM(n,v,f) ((v) == 4 ? (n)->f.in4.s_addr : (n)->f.i6[0] + \ 125 (n)->f.i6[1] + (n)->f.i6[2] + (n)->f.i6[3]) 126 #define NBUMP(x) softn->(x)++ 127 #define NBUMPD(x, y) do { \ 128 softn->x.y++; \ 129 DT(y); \ 130 } while (0) 131 #define NBUMPSIDE(y,x) softn->ipf_nat_stats.ns_side[y].x++ 132 #define NBUMPSIDED(y,x) do { softn->ipf_nat_stats.ns_side[y].x++; \ 133 DT(x); } while (0) 134 #define NBUMPSIDEX(y,x,z) \ 135 do { softn->ipf_nat_stats.ns_side[y].x++; \ 136 DT(z); } while (0) 137 #define NBUMPSIDEDF(y,x)do { softn->ipf_nat_stats.ns_side[y].x++; \ 138 DT1(x, fr_info_t *, fin); } while (0) 139 140 frentry_t ipfnatblock; 141 142 static ipftuneable_t ipf_nat_tuneables[] = { 143 /* nat */ 144 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_lock) }, 145 "nat_lock", 0, 1, 146 stsizeof(ipf_nat_softc_t, ipf_nat_lock), 147 IPFT_RDONLY, NULL, NULL }, 148 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_sz) }, 149 "nat_table_size", 1, 0x7fffffff, 150 stsizeof(ipf_nat_softc_t, ipf_nat_table_sz), 151 0, NULL, ipf_nat_rehash }, 152 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_max) }, 153 "nat_table_max", 1, 0x7fffffff, 154 stsizeof(ipf_nat_softc_t, ipf_nat_table_max), 155 0, NULL, NULL }, 156 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maprules_sz) }, 157 "nat_rules_size", 1, 0x7fffffff, 158 stsizeof(ipf_nat_softc_t, ipf_nat_maprules_sz), 159 0, NULL, ipf_nat_rehash_rules }, 160 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_rdrrules_sz) }, 161 "rdr_rules_size", 1, 0x7fffffff, 162 stsizeof(ipf_nat_softc_t, ipf_nat_rdrrules_sz), 163 0, NULL, ipf_nat_rehash_rules }, 164 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_hostmap_sz) }, 165 "hostmap_size", 1, 0x7fffffff, 166 stsizeof(ipf_nat_softc_t, ipf_nat_hostmap_sz), 167 0, NULL, ipf_nat_hostmap_rehash }, 168 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_maxbucket) }, 169 "nat_maxbucket",1, 0x7fffffff, 170 stsizeof(ipf_nat_softc_t, ipf_nat_maxbucket), 171 0, NULL, NULL }, 172 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_logging) }, 173 "nat_logging", 0, 1, 174 stsizeof(ipf_nat_softc_t, ipf_nat_logging), 175 0, NULL, NULL }, 176 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_doflush) }, 177 "nat_doflush", 0, 1, 178 stsizeof(ipf_nat_softc_t, ipf_nat_doflush), 179 0, NULL, NULL }, 180 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_low) }, 181 "nat_table_wm_low", 1, 99, 182 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_low), 183 0, NULL, NULL }, 184 { { (void *)offsetof(ipf_nat_softc_t, ipf_nat_table_wm_high) }, 185 "nat_table_wm_high", 2, 100, 186 stsizeof(ipf_nat_softc_t, ipf_nat_table_wm_high), 187 0, NULL, NULL }, 188 { { 0 }, 189 NULL, 0, 0, 190 0, 191 0, NULL, NULL } 192 }; 193 194 /* ======================================================================== */ 195 /* How the NAT is organised and works. */ 196 /* */ 197 /* Inside (interface y) NAT Outside (interface x) */ 198 /* -------------------- -+- ------------------------------------- */ 199 /* Packet going | out, processsed by ipf_nat_checkout() for x */ 200 /* ------------> | ------------> */ 201 /* src=10.1.1.1 | src=192.1.1.1 */ 202 /* | */ 203 /* | in, processed by ipf_nat_checkin() for x */ 204 /* <------------ | <------------ */ 205 /* dst=10.1.1.1 | dst=192.1.1.1 */ 206 /* -------------------- -+- ------------------------------------- */ 207 /* ipf_nat_checkout() - changes ip_src and if required, sport */ 208 /* - creates a new mapping, if required. */ 209 /* ipf_nat_checkin() - changes ip_dst and if required, dport */ 210 /* */ 211 /* In the NAT table, internal source is recorded as "in" and externally */ 212 /* seen as "out". */ 213 /* ======================================================================== */ 214 215 216 #if SOLARIS && !defined(INSTANCES) 217 extern int pfil_delayed_copy; 218 #endif 219 220 static int ipf_nat_flush_entry(ipf_main_softc_t *, void *); 221 static int ipf_nat_getent(ipf_main_softc_t *, void *, int); 222 static int ipf_nat_getsz(ipf_main_softc_t *, void *, int); 223 static int ipf_nat_putent(ipf_main_softc_t *, void *, int); 224 static void ipf_nat_addmap(ipf_nat_softc_t *, ipnat_t *); 225 static void ipf_nat_addrdr(ipf_nat_softc_t *, ipnat_t *); 226 static int ipf_nat_builddivertmp(ipf_nat_softc_t *, ipnat_t *); 227 static int ipf_nat_clearlist(ipf_main_softc_t *, ipf_nat_softc_t *); 228 static int ipf_nat_cmp_rules(ipnat_t *, ipnat_t *); 229 static int ipf_nat_decap(fr_info_t *, nat_t *); 230 static void ipf_nat_delrule(ipf_main_softc_t *, ipf_nat_softc_t *, 231 ipnat_t *, int); 232 static int ipf_nat_extraflush(ipf_main_softc_t *, ipf_nat_softc_t *, int); 233 static int ipf_nat_finalise(fr_info_t *, nat_t *); 234 static int ipf_nat_flushtable(ipf_main_softc_t *, ipf_nat_softc_t *); 235 static int ipf_nat_getnext(ipf_main_softc_t *, ipftoken_t *, 236 ipfgeniter_t *, ipfobj_t *); 237 static int ipf_nat_gettable(ipf_main_softc_t *, ipf_nat_softc_t *, char *); 238 static hostmap_t *ipf_nat_hostmap(ipf_nat_softc_t *, ipnat_t *, 239 struct in_addr, struct in_addr, 240 struct in_addr, u_32_t); 241 static int ipf_nat_icmpquerytype(int); 242 static int ipf_nat_iterator(ipf_main_softc_t *, ipftoken_t *, 243 ipfgeniter_t *, ipfobj_t *); 244 static int ipf_nat_match(fr_info_t *, ipnat_t *); 245 static int ipf_nat_matcharray(nat_t *, int *, u_long); 246 static int ipf_nat_matchflush(ipf_main_softc_t *, ipf_nat_softc_t *, 247 void *); 248 static void ipf_nat_mssclamp(tcphdr_t *, u_32_t, fr_info_t *, u_short *); 249 static int ipf_nat_newmap(fr_info_t *, nat_t *, natinfo_t *); 250 static int ipf_nat_newdivert(fr_info_t *, nat_t *, natinfo_t *); 251 static int ipf_nat_newrdr(fr_info_t *, nat_t *, natinfo_t *); 252 static int ipf_nat_newrewrite(fr_info_t *, nat_t *, natinfo_t *); 253 static int ipf_nat_nextaddr(fr_info_t *, nat_addr_t *, u_32_t *, u_32_t *); 254 static int ipf_nat_nextaddrinit(ipf_main_softc_t *, char *, 255 nat_addr_t *, int, void *); 256 static int ipf_nat_resolverule(ipf_main_softc_t *, ipnat_t *); 257 static int ipf_nat_ruleaddrinit(ipf_main_softc_t *, 258 ipf_nat_softc_t *, ipnat_t *); 259 static void ipf_nat_rule_fini(ipf_main_softc_t *, ipnat_t *); 260 static int ipf_nat_rule_init(ipf_main_softc_t *, ipf_nat_softc_t *, 261 ipnat_t *); 262 static int ipf_nat_siocaddnat(ipf_main_softc_t *, ipf_nat_softc_t *, 263 ipnat_t *, int); 264 static void ipf_nat_siocdelnat(ipf_main_softc_t *, ipf_nat_softc_t *, 265 ipnat_t *, int); 266 static void ipf_nat_tabmove(ipf_nat_softc_t *, nat_t *); 267 268 /* ------------------------------------------------------------------------ */ 269 /* Function: ipf_nat_main_load */ 270 /* Returns: int - 0 == success, -1 == failure */ 271 /* Parameters: Nil */ 272 /* */ 273 /* The only global NAT structure that needs to be initialised is the filter */ 274 /* rule that is used with blocking packets. */ 275 /* ------------------------------------------------------------------------ */ 276 int 277 ipf_nat_main_load(void) 278 { 279 bzero((char *)&ipfnatblock, sizeof(ipfnatblock)); 280 ipfnatblock.fr_flags = FR_BLOCK|FR_QUICK; 281 ipfnatblock.fr_ref = 1; 282 283 return 0; 284 } 285 286 287 /* ------------------------------------------------------------------------ */ 288 /* Function: ipf_nat_main_unload */ 289 /* Returns: int - 0 == success, -1 == failure */ 290 /* Parameters: Nil */ 291 /* */ 292 /* A null-op function that exists as a placeholder so that the flow in */ 293 /* other functions is obvious. */ 294 /* ------------------------------------------------------------------------ */ 295 int 296 ipf_nat_main_unload(void) 297 { 298 return 0; 299 } 300 301 302 /* ------------------------------------------------------------------------ */ 303 /* Function: ipf_nat_soft_create */ 304 /* Returns: void * - NULL = failure, else pointer to NAT context */ 305 /* Parameters: softc(I) - pointer to soft context main structure */ 306 /* */ 307 /* Allocate the initial soft context structure for NAT and populate it with */ 308 /* some default values. Creating the tables is left until we call _init so */ 309 /* that sizes can be changed before we get under way. */ 310 /* ------------------------------------------------------------------------ */ 311 void * 312 ipf_nat_soft_create(ipf_main_softc_t *softc) 313 { 314 ipf_nat_softc_t *softn; 315 316 KMALLOC(softn, ipf_nat_softc_t *); 317 if (softn == NULL) 318 return NULL; 319 320 bzero((char *)softn, sizeof(*softn)); 321 322 softn->ipf_nat_tune = ipf_tune_array_copy(softn, 323 sizeof(ipf_nat_tuneables), 324 ipf_nat_tuneables); 325 if (softn->ipf_nat_tune == NULL) { 326 ipf_nat_soft_destroy(softc, softn); 327 return NULL; 328 } 329 if (ipf_tune_array_link(softc, softn->ipf_nat_tune) == -1) { 330 ipf_nat_soft_destroy(softc, softn); 331 return NULL; 332 } 333 334 softn->ipf_nat_list_tail = &softn->ipf_nat_list; 335 336 softn->ipf_nat_table_max = NAT_TABLE_MAX; 337 softn->ipf_nat_table_sz = NAT_TABLE_SZ; 338 softn->ipf_nat_maprules_sz = NAT_SIZE; 339 softn->ipf_nat_rdrrules_sz = RDR_SIZE; 340 softn->ipf_nat_hostmap_sz = HOSTMAP_SIZE; 341 softn->ipf_nat_doflush = 0; 342 #ifdef IPFILTER_LOG 343 softn->ipf_nat_logging = 1; 344 #else 345 softn->ipf_nat_logging = 0; 346 #endif 347 348 softn->ipf_nat_defage = DEF_NAT_AGE; 349 softn->ipf_nat_defipage = IPF_TTLVAL(60); 350 softn->ipf_nat_deficmpage = IPF_TTLVAL(3); 351 softn->ipf_nat_table_wm_high = 99; 352 softn->ipf_nat_table_wm_low = 90; 353 354 return softn; 355 } 356 357 /* ------------------------------------------------------------------------ */ 358 /* Function: ipf_nat_soft_destroy */ 359 /* Returns: Nil */ 360 /* Parameters: softc(I) - pointer to soft context main structure */ 361 /* */ 362 /* ------------------------------------------------------------------------ */ 363 void 364 ipf_nat_soft_destroy(ipf_main_softc_t *softc, void *arg) 365 { 366 ipf_nat_softc_t *softn = arg; 367 368 if (softn->ipf_nat_tune != NULL) { 369 ipf_tune_array_unlink(softc, softn->ipf_nat_tune); 370 KFREES(softn->ipf_nat_tune, sizeof(ipf_nat_tuneables)); 371 softn->ipf_nat_tune = NULL; 372 } 373 374 KFREE(softn); 375 } 376 377 378 /* ------------------------------------------------------------------------ */ 379 /* Function: ipf_nat_init */ 380 /* Returns: int - 0 == success, -1 == failure */ 381 /* Parameters: softc(I) - pointer to soft context main structure */ 382 /* */ 383 /* Initialise all of the NAT locks, tables and other structures. */ 384 /* ------------------------------------------------------------------------ */ 385 int 386 ipf_nat_soft_init(ipf_main_softc_t *softc, void *arg) 387 { 388 ipf_nat_softc_t *softn = arg; 389 ipftq_t *tq; 390 int i; 391 392 KMALLOCS(softn->ipf_nat_table[0], nat_t **, \ 393 sizeof(nat_t *) * softn->ipf_nat_table_sz); 394 395 if (softn->ipf_nat_table[0] != NULL) { 396 bzero((char *)softn->ipf_nat_table[0], 397 softn->ipf_nat_table_sz * sizeof(nat_t *)); 398 } else { 399 return -1; 400 } 401 402 KMALLOCS(softn->ipf_nat_table[1], nat_t **, \ 403 sizeof(nat_t *) * softn->ipf_nat_table_sz); 404 405 if (softn->ipf_nat_table[1] != NULL) { 406 bzero((char *)softn->ipf_nat_table[1], 407 softn->ipf_nat_table_sz * sizeof(nat_t *)); 408 } else { 409 return -2; 410 } 411 412 KMALLOCS(softn->ipf_nat_map_rules, ipnat_t **, \ 413 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 414 415 if (softn->ipf_nat_map_rules != NULL) { 416 bzero((char *)softn->ipf_nat_map_rules, 417 softn->ipf_nat_maprules_sz * sizeof(ipnat_t *)); 418 } else { 419 return -3; 420 } 421 422 KMALLOCS(softn->ipf_nat_rdr_rules, ipnat_t **, \ 423 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 424 425 if (softn->ipf_nat_rdr_rules != NULL) { 426 bzero((char *)softn->ipf_nat_rdr_rules, 427 softn->ipf_nat_rdrrules_sz * sizeof(ipnat_t *)); 428 } else { 429 return -4; 430 } 431 432 KMALLOCS(softn->ipf_hm_maptable, hostmap_t **, \ 433 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 434 435 if (softn->ipf_hm_maptable != NULL) { 436 bzero((char *)softn->ipf_hm_maptable, 437 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 438 } else { 439 return -5; 440 } 441 softn->ipf_hm_maplist = NULL; 442 443 KMALLOCS(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, u_int *, 444 softn->ipf_nat_table_sz * sizeof(u_int)); 445 446 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen == NULL) { 447 return -6; 448 } 449 bzero((char *)softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 450 softn->ipf_nat_table_sz * sizeof(u_int)); 451 452 KMALLOCS(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, u_int *, 453 softn->ipf_nat_table_sz * sizeof(u_int)); 454 455 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen == NULL) { 456 return -7; 457 } 458 459 bzero((char *)softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 460 softn->ipf_nat_table_sz * sizeof(u_int)); 461 462 if (softn->ipf_nat_maxbucket == 0) { 463 for (i = softn->ipf_nat_table_sz; i > 0; i >>= 1) 464 softn->ipf_nat_maxbucket++; 465 softn->ipf_nat_maxbucket *= 2; 466 } 467 468 ipf_sttab_init(softc, softn->ipf_nat_tcptq); 469 /* 470 * Increase this because we may have "keep state" following this too 471 * and packet storms can occur if this is removed too quickly. 472 */ 473 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 474 softn->ipf_nat_tcptq[IPF_TCP_NSTATES - 1].ifq_next = 475 &softn->ipf_nat_udptq; 476 477 IPFTQ_INIT(&softn->ipf_nat_udptq, softn->ipf_nat_defage, 478 "nat ipftq udp tab"); 479 softn->ipf_nat_udptq.ifq_next = &softn->ipf_nat_udpacktq; 480 481 IPFTQ_INIT(&softn->ipf_nat_udpacktq, softn->ipf_nat_defage, 482 "nat ipftq udpack tab"); 483 softn->ipf_nat_udpacktq.ifq_next = &softn->ipf_nat_icmptq; 484 485 IPFTQ_INIT(&softn->ipf_nat_icmptq, softn->ipf_nat_deficmpage, 486 "nat icmp ipftq tab"); 487 softn->ipf_nat_icmptq.ifq_next = &softn->ipf_nat_icmpacktq; 488 489 IPFTQ_INIT(&softn->ipf_nat_icmpacktq, softn->ipf_nat_defage, 490 "nat icmpack ipftq tab"); 491 softn->ipf_nat_icmpacktq.ifq_next = &softn->ipf_nat_iptq; 492 493 IPFTQ_INIT(&softn->ipf_nat_iptq, softn->ipf_nat_defipage, 494 "nat ip ipftq tab"); 495 softn->ipf_nat_iptq.ifq_next = &softn->ipf_nat_pending; 496 497 IPFTQ_INIT(&softn->ipf_nat_pending, 1, "nat pending ipftq tab"); 498 softn->ipf_nat_pending.ifq_next = NULL; 499 500 for (i = 0, tq = softn->ipf_nat_tcptq; i < IPF_TCP_NSTATES; i++, tq++) { 501 if (tq->ifq_ttl < softn->ipf_nat_deficmpage) 502 tq->ifq_ttl = softn->ipf_nat_deficmpage; 503 #ifdef LARGE_NAT 504 else if (tq->ifq_ttl > softn->ipf_nat_defage) 505 tq->ifq_ttl = softn->ipf_nat_defage; 506 #endif 507 } 508 509 /* 510 * Increase this because we may have "keep state" following 511 * this too and packet storms can occur if this is removed 512 * too quickly. 513 */ 514 softn->ipf_nat_tcptq[IPF_TCPS_CLOSED].ifq_ttl = softc->ipf_tcplastack; 515 516 MUTEX_INIT(&softn->ipf_nat_new, "ipf nat new mutex"); 517 MUTEX_INIT(&softn->ipf_nat_io, "ipf nat io mutex"); 518 519 softn->ipf_nat_inited = 1; 520 521 return 0; 522 } 523 524 525 /* ------------------------------------------------------------------------ */ 526 /* Function: ipf_nat_soft_fini */ 527 /* Returns: Nil */ 528 /* Parameters: softc(I) - pointer to soft context main structure */ 529 /* */ 530 /* Free all memory used by NAT structures allocated at runtime. */ 531 /* ------------------------------------------------------------------------ */ 532 int 533 ipf_nat_soft_fini(ipf_main_softc_t *softc, void *arg) 534 { 535 ipf_nat_softc_t *softn = arg; 536 ipftq_t *ifq, *ifqnext; 537 538 (void) ipf_nat_clearlist(softc, softn); 539 (void) ipf_nat_flushtable(softc, softn); 540 541 /* 542 * Proxy timeout queues are not cleaned here because although they 543 * exist on the NAT list, ipf_proxy_unload is called after unload 544 * and the proxies actually are responsible for them being created. 545 * Should the proxy timeouts have their own list? There's no real 546 * justification as this is the only complication. 547 */ 548 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 549 ifqnext = ifq->ifq_next; 550 if (ipf_deletetimeoutqueue(ifq) == 0) 551 ipf_freetimeoutqueue(softc, ifq); 552 } 553 554 if (softn->ipf_nat_table[0] != NULL) { 555 KFREES(softn->ipf_nat_table[0], 556 sizeof(nat_t *) * softn->ipf_nat_table_sz); 557 softn->ipf_nat_table[0] = NULL; 558 } 559 if (softn->ipf_nat_table[1] != NULL) { 560 KFREES(softn->ipf_nat_table[1], 561 sizeof(nat_t *) * softn->ipf_nat_table_sz); 562 softn->ipf_nat_table[1] = NULL; 563 } 564 if (softn->ipf_nat_map_rules != NULL) { 565 KFREES(softn->ipf_nat_map_rules, 566 sizeof(ipnat_t *) * softn->ipf_nat_maprules_sz); 567 softn->ipf_nat_map_rules = NULL; 568 } 569 if (softn->ipf_nat_rdr_rules != NULL) { 570 KFREES(softn->ipf_nat_rdr_rules, 571 sizeof(ipnat_t *) * softn->ipf_nat_rdrrules_sz); 572 softn->ipf_nat_rdr_rules = NULL; 573 } 574 if (softn->ipf_hm_maptable != NULL) { 575 KFREES(softn->ipf_hm_maptable, 576 sizeof(hostmap_t *) * softn->ipf_nat_hostmap_sz); 577 softn->ipf_hm_maptable = NULL; 578 } 579 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 580 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 581 sizeof(u_int) * softn->ipf_nat_table_sz); 582 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = NULL; 583 } 584 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 585 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 586 sizeof(u_int) * softn->ipf_nat_table_sz); 587 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = NULL; 588 } 589 590 if (softn->ipf_nat_inited == 1) { 591 softn->ipf_nat_inited = 0; 592 ipf_sttab_destroy(softn->ipf_nat_tcptq); 593 594 MUTEX_DESTROY(&softn->ipf_nat_new); 595 MUTEX_DESTROY(&softn->ipf_nat_io); 596 597 MUTEX_DESTROY(&softn->ipf_nat_udptq.ifq_lock); 598 MUTEX_DESTROY(&softn->ipf_nat_udpacktq.ifq_lock); 599 MUTEX_DESTROY(&softn->ipf_nat_icmptq.ifq_lock); 600 MUTEX_DESTROY(&softn->ipf_nat_icmpacktq.ifq_lock); 601 MUTEX_DESTROY(&softn->ipf_nat_iptq.ifq_lock); 602 MUTEX_DESTROY(&softn->ipf_nat_pending.ifq_lock); 603 } 604 605 return 0; 606 } 607 608 609 /* ------------------------------------------------------------------------ */ 610 /* Function: ipf_nat_setlock */ 611 /* Returns: Nil */ 612 /* Parameters: arg(I) - pointer to soft state information */ 613 /* tmp(I) - new lock value */ 614 /* */ 615 /* Set the "lock status" of NAT to the value in tmp. */ 616 /* ------------------------------------------------------------------------ */ 617 void 618 ipf_nat_setlock(void *arg, int tmp) 619 { 620 ipf_nat_softc_t *softn = arg; 621 622 softn->ipf_nat_lock = tmp; 623 } 624 625 626 /* ------------------------------------------------------------------------ */ 627 /* Function: ipf_nat_addrdr */ 628 /* Returns: Nil */ 629 /* Parameters: n(I) - pointer to NAT rule to add */ 630 /* */ 631 /* Adds a redirect rule to the hash table of redirect rules and the list of */ 632 /* loaded NAT rules. Updates the bitmask indicating which netmasks are in */ 633 /* use by redirect rules. */ 634 /* ------------------------------------------------------------------------ */ 635 static void 636 ipf_nat_addrdr(ipf_nat_softc_t *softn, ipnat_t *n) 637 { 638 ipnat_t **np; 639 u_32_t j; 640 u_int hv; 641 u_int rhv; 642 int k; 643 644 if (n->in_odstatype == FRI_NORMAL) { 645 k = count4bits(n->in_odstmsk); 646 ipf_inet_mask_add(k, &softn->ipf_nat_rdr_mask); 647 j = (n->in_odstaddr & n->in_odstmsk); 648 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 649 } else { 650 ipf_inet_mask_add(0, &softn->ipf_nat_rdr_mask); 651 j = 0; 652 rhv = 0; 653 } 654 hv = rhv % softn->ipf_nat_rdrrules_sz; 655 np = softn->ipf_nat_rdr_rules + hv; 656 while (*np != NULL) 657 np = &(*np)->in_rnext; 658 n->in_rnext = NULL; 659 n->in_prnext = np; 660 n->in_hv[0] = hv; 661 n->in_use++; 662 *np = n; 663 } 664 665 666 /* ------------------------------------------------------------------------ */ 667 /* Function: ipf_nat_addmap */ 668 /* Returns: Nil */ 669 /* Parameters: n(I) - pointer to NAT rule to add */ 670 /* */ 671 /* Adds a NAT map rule to the hash table of rules and the list of loaded */ 672 /* NAT rules. Updates the bitmask indicating which netmasks are in use by */ 673 /* redirect rules. */ 674 /* ------------------------------------------------------------------------ */ 675 static void 676 ipf_nat_addmap(ipf_nat_softc_t *softn, ipnat_t *n) 677 { 678 ipnat_t **np; 679 u_32_t j; 680 u_int hv; 681 u_int rhv; 682 int k; 683 684 if (n->in_osrcatype == FRI_NORMAL) { 685 k = count4bits(n->in_osrcmsk); 686 ipf_inet_mask_add(k, &softn->ipf_nat_map_mask); 687 j = (n->in_osrcaddr & n->in_osrcmsk); 688 rhv = NAT_HASH_FN(j, 0, 0xffffffff); 689 } else { 690 ipf_inet_mask_add(0, &softn->ipf_nat_map_mask); 691 j = 0; 692 rhv = 0; 693 } 694 hv = rhv % softn->ipf_nat_maprules_sz; 695 np = softn->ipf_nat_map_rules + hv; 696 while (*np != NULL) 697 np = &(*np)->in_mnext; 698 n->in_mnext = NULL; 699 n->in_pmnext = np; 700 n->in_hv[1] = rhv; 701 n->in_use++; 702 *np = n; 703 } 704 705 706 /* ------------------------------------------------------------------------ */ 707 /* Function: ipf_nat_delrdr */ 708 /* Returns: Nil */ 709 /* Parameters: n(I) - pointer to NAT rule to delete */ 710 /* */ 711 /* Removes a redirect rule from the hash table of redirect rules. */ 712 /* ------------------------------------------------------------------------ */ 713 void 714 ipf_nat_delrdr(ipf_nat_softc_t *softn, ipnat_t *n) 715 { 716 if (n->in_odstatype == FRI_NORMAL) { 717 int k = count4bits(n->in_odstmsk); 718 ipf_inet_mask_del(k, &softn->ipf_nat_rdr_mask); 719 } else { 720 ipf_inet_mask_del(0, &softn->ipf_nat_rdr_mask); 721 } 722 if (n->in_rnext) 723 n->in_rnext->in_prnext = n->in_prnext; 724 *n->in_prnext = n->in_rnext; 725 n->in_use--; 726 } 727 728 729 /* ------------------------------------------------------------------------ */ 730 /* Function: ipf_nat_delmap */ 731 /* Returns: Nil */ 732 /* Parameters: n(I) - pointer to NAT rule to delete */ 733 /* */ 734 /* Removes a NAT map rule from the hash table of NAT map rules. */ 735 /* ------------------------------------------------------------------------ */ 736 void 737 ipf_nat_delmap(ipf_nat_softc_t *softn, ipnat_t *n) 738 { 739 if (n->in_osrcatype == FRI_NORMAL) { 740 int k = count4bits(n->in_osrcmsk); 741 ipf_inet_mask_del(k, &softn->ipf_nat_map_mask); 742 } else { 743 ipf_inet_mask_del(0, &softn->ipf_nat_map_mask); 744 } 745 if (n->in_mnext != NULL) 746 n->in_mnext->in_pmnext = n->in_pmnext; 747 *n->in_pmnext = n->in_mnext; 748 n->in_use--; 749 } 750 751 752 /* ------------------------------------------------------------------------ */ 753 /* Function: ipf_nat_hostmap */ 754 /* Returns: struct hostmap* - NULL if no hostmap could be created, */ 755 /* else a pointer to the hostmapping to use */ 756 /* Parameters: np(I) - pointer to NAT rule */ 757 /* real(I) - real IP address */ 758 /* map(I) - mapped IP address */ 759 /* port(I) - destination port number */ 760 /* Write Locks: ipf_nat */ 761 /* */ 762 /* Check if an ip address has already been allocated for a given mapping */ 763 /* that is not doing port based translation. If is not yet allocated, then */ 764 /* create a new entry if a non-NULL NAT rule pointer has been supplied. */ 765 /* ------------------------------------------------------------------------ */ 766 static struct hostmap * 767 ipf_nat_hostmap(ipf_nat_softc_t *softn, ipnat_t *np, struct in_addr src, 768 struct in_addr dst, struct in_addr map, u_32_t port) 769 { 770 hostmap_t *hm; 771 u_int hv, rhv; 772 773 hv = (src.s_addr ^ dst.s_addr); 774 hv += src.s_addr; 775 hv += dst.s_addr; 776 rhv = hv; 777 hv %= softn->ipf_nat_hostmap_sz; 778 for (hm = softn->ipf_hm_maptable[hv]; hm; hm = hm->hm_hnext) 779 if ((hm->hm_osrcip.s_addr == src.s_addr) && 780 (hm->hm_odstip.s_addr == dst.s_addr) && 781 ((np == NULL) || (np == hm->hm_ipnat)) && 782 ((port == 0) || (port == hm->hm_port))) { 783 softn->ipf_nat_stats.ns_hm_addref++; 784 hm->hm_ref++; 785 return hm; 786 } 787 788 if (np == NULL) { 789 softn->ipf_nat_stats.ns_hm_nullnp++; 790 return NULL; 791 } 792 793 KMALLOC(hm, hostmap_t *); 794 if (hm) { 795 hm->hm_next = softn->ipf_hm_maplist; 796 hm->hm_pnext = &softn->ipf_hm_maplist; 797 if (softn->ipf_hm_maplist != NULL) 798 softn->ipf_hm_maplist->hm_pnext = &hm->hm_next; 799 softn->ipf_hm_maplist = hm; 800 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 801 hm->hm_phnext = softn->ipf_hm_maptable + hv; 802 if (softn->ipf_hm_maptable[hv] != NULL) 803 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 804 softn->ipf_hm_maptable[hv] = hm; 805 hm->hm_ipnat = np; 806 np->in_use++; 807 hm->hm_osrcip = src; 808 hm->hm_odstip = dst; 809 hm->hm_nsrcip = map; 810 hm->hm_ndstip.s_addr = 0; 811 hm->hm_ref = 1; 812 hm->hm_port = port; 813 hm->hm_hv = rhv; 814 hm->hm_v = 4; 815 softn->ipf_nat_stats.ns_hm_new++; 816 } else { 817 softn->ipf_nat_stats.ns_hm_newfail++; 818 } 819 return hm; 820 } 821 822 823 /* ------------------------------------------------------------------------ */ 824 /* Function: ipf_nat_hostmapdel */ 825 /* Returns: Nil */ 826 /* Parameters: hmp(I) - pointer to hostmap structure pointer */ 827 /* Write Locks: ipf_nat */ 828 /* */ 829 /* Decrement the references to this hostmap structure by one. If this */ 830 /* reaches zero then remove it and free it. */ 831 /* ------------------------------------------------------------------------ */ 832 void 833 ipf_nat_hostmapdel(ipf_main_softc_t *softc, struct hostmap **hmp) 834 { 835 struct hostmap *hm; 836 837 hm = *hmp; 838 *hmp = NULL; 839 840 hm->hm_ref--; 841 if (hm->hm_ref == 0) { 842 ipf_nat_rule_deref(softc, &hm->hm_ipnat); 843 if (hm->hm_hnext) 844 hm->hm_hnext->hm_phnext = hm->hm_phnext; 845 *hm->hm_phnext = hm->hm_hnext; 846 if (hm->hm_next) 847 hm->hm_next->hm_pnext = hm->hm_pnext; 848 *hm->hm_pnext = hm->hm_next; 849 KFREE(hm); 850 } 851 } 852 853 854 /* ------------------------------------------------------------------------ */ 855 /* Function: ipf_fix_outcksum */ 856 /* Returns: Nil */ 857 /* Parameters: fin(I) - pointer to packet information */ 858 /* sp(I) - location of 16bit checksum to update */ 859 /* n((I) - amount to adjust checksum by */ 860 /* */ 861 /* Adjusts the 16bit checksum by "n" for packets going out. */ 862 /* ------------------------------------------------------------------------ */ 863 void 864 ipf_fix_outcksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) 865 { 866 u_short sumshort; 867 u_32_t sum1; 868 869 if (n == 0) 870 return; 871 872 if (cksum == 4) { 873 *sp = 0; 874 return; 875 } 876 if (cksum == 2) { 877 sum1 = partial; 878 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 879 *sp = htons(sum1); 880 return; 881 } 882 sum1 = (~ntohs(*sp)) & 0xffff; 883 sum1 += (n); 884 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 885 /* Again */ 886 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 887 sumshort = ~(u_short)sum1; 888 *(sp) = htons(sumshort); 889 } 890 891 892 /* ------------------------------------------------------------------------ */ 893 /* Function: ipf_fix_incksum */ 894 /* Returns: Nil */ 895 /* Parameters: fin(I) - pointer to packet information */ 896 /* sp(I) - location of 16bit checksum to update */ 897 /* n((I) - amount to adjust checksum by */ 898 /* */ 899 /* Adjusts the 16bit checksum by "n" for packets going in. */ 900 /* ------------------------------------------------------------------------ */ 901 void 902 ipf_fix_incksum(int cksum, u_short *sp, u_32_t n, u_32_t partial) 903 { 904 u_short sumshort; 905 u_32_t sum1; 906 907 if (n == 0) 908 return; 909 910 if (cksum == 4) { 911 *sp = 0; 912 return; 913 } 914 if (cksum == 2) { 915 sum1 = partial; 916 sum1 = (sum1 & 0xffff) + (sum1 >> 16); 917 *sp = htons(sum1); 918 return; 919 } 920 921 sum1 = (~ntohs(*sp)) & 0xffff; 922 sum1 += ~(n) & 0xffff; 923 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 924 /* Again */ 925 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 926 sumshort = ~(u_short)sum1; 927 *(sp) = htons(sumshort); 928 } 929 930 931 /* ------------------------------------------------------------------------ */ 932 /* Function: ipf_fix_datacksum */ 933 /* Returns: Nil */ 934 /* Parameters: sp(I) - location of 16bit checksum to update */ 935 /* n((I) - amount to adjust checksum by */ 936 /* */ 937 /* Fix_datacksum is used *only* for the adjustments of checksums in the */ 938 /* data section of an IP packet. */ 939 /* */ 940 /* The only situation in which you need to do this is when NAT'ing an */ 941 /* ICMP error message. Such a message, contains in its body the IP header */ 942 /* of the original IP packet, that causes the error. */ 943 /* */ 944 /* You can't use fix_incksum or fix_outcksum in that case, because for the */ 945 /* kernel the data section of the ICMP error is just data, and no special */ 946 /* processing like hardware cksum or ntohs processing have been done by the */ 947 /* kernel on the data section. */ 948 /* ------------------------------------------------------------------------ */ 949 void 950 ipf_fix_datacksum(u_short *sp, u_32_t n) 951 { 952 u_short sumshort; 953 u_32_t sum1; 954 955 if (n == 0) 956 return; 957 958 sum1 = (~ntohs(*sp)) & 0xffff; 959 sum1 += (n); 960 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 961 /* Again */ 962 sum1 = (sum1 >> 16) + (sum1 & 0xffff); 963 sumshort = ~(u_short)sum1; 964 *(sp) = htons(sumshort); 965 } 966 967 968 /* ------------------------------------------------------------------------ */ 969 /* Function: ipf_nat_ioctl */ 970 /* Returns: int - 0 == success, != 0 == failure */ 971 /* Parameters: softc(I) - pointer to soft context main structure */ 972 /* data(I) - pointer to ioctl data */ 973 /* cmd(I) - ioctl command integer */ 974 /* mode(I) - file mode bits used with open */ 975 /* uid(I) - uid of calling process */ 976 /* ctx(I) - pointer used as key for finding context */ 977 /* */ 978 /* Processes an ioctl call made to operate on the IP Filter NAT device. */ 979 /* ------------------------------------------------------------------------ */ 980 int 981 ipf_nat_ioctl(ipf_main_softc_t *softc, void *data, ioctlcmd_t cmd, int mode, 982 int uid, void *ctx) 983 { 984 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 985 int error = 0, ret, arg, getlock; 986 ipnat_t *nat, *nt, *n; 987 ipnat_t natd; 988 SPL_INT(s); 989 990 #if BSD_GE_YEAR(199306) && defined(_KERNEL) 991 # if NETBSD_GE_REV(399002000) 992 if ((mode & FWRITE) && 993 kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_FIREWALL, 994 KAUTH_REQ_NETWORK_FIREWALL_FW, 995 NULL, NULL, NULL)) 996 # else 997 # if defined(__FreeBSD_version) && (__FreeBSD_version >= 500034) 998 if (securelevel_ge(curthread->td_ucred, 3) && (mode & FWRITE)) 999 # else 1000 if ((securelevel >= 3) && (mode & FWRITE)) 1001 # endif 1002 # endif 1003 { 1004 IPFERROR(60001); 1005 return EPERM; 1006 } 1007 #endif 1008 1009 #if defined(__osf__) && defined(_KERNEL) 1010 getlock = 0; 1011 #else 1012 getlock = (mode & NAT_LOCKHELD) ? 0 : 1; 1013 #endif 1014 1015 n = NULL; 1016 nt = NULL; 1017 nat = NULL; 1018 1019 if ((cmd == (ioctlcmd_t)SIOCADNAT) || (cmd == (ioctlcmd_t)SIOCRMNAT) || 1020 (cmd == (ioctlcmd_t)SIOCPURGENAT)) { 1021 if (mode & NAT_SYSSPACE) { 1022 bcopy(data, (char *)&natd, sizeof(natd)); 1023 nat = &natd; 1024 error = 0; 1025 } else { 1026 bzero(&natd, sizeof(natd)); 1027 error = ipf_inobj(softc, data, NULL, &natd, 1028 IPFOBJ_IPNAT); 1029 if (error != 0) 1030 goto done; 1031 1032 if (natd.in_size < sizeof(ipnat_t)) { 1033 error = EINVAL; 1034 goto done; 1035 } 1036 KMALLOCS(nt, ipnat_t *, natd.in_size); 1037 if (nt == NULL) { 1038 IPFERROR(60070); 1039 error = ENOMEM; 1040 goto done; 1041 } 1042 bzero(nt, natd.in_size); 1043 error = ipf_inobjsz(softc, data, nt, IPFOBJ_IPNAT, 1044 natd.in_size); 1045 if (error) 1046 goto done; 1047 nat = nt; 1048 } 1049 1050 /* 1051 * For add/delete, look to see if the NAT entry is 1052 * already present 1053 */ 1054 nat->in_flags &= IPN_USERFLAGS; 1055 if ((nat->in_redir & NAT_MAPBLK) == 0) { 1056 if (nat->in_osrcatype == FRI_NORMAL || 1057 nat->in_osrcatype == FRI_NONE) 1058 nat->in_osrcaddr &= nat->in_osrcmsk; 1059 if (nat->in_odstatype == FRI_NORMAL || 1060 nat->in_odstatype == FRI_NONE) 1061 nat->in_odstaddr &= nat->in_odstmsk; 1062 if ((nat->in_flags & (IPN_SPLIT|IPN_SIPRANGE)) == 0) { 1063 if (nat->in_nsrcatype == FRI_NORMAL) 1064 nat->in_nsrcaddr &= nat->in_nsrcmsk; 1065 if (nat->in_ndstatype == FRI_NORMAL) 1066 nat->in_ndstaddr &= nat->in_ndstmsk; 1067 } 1068 } 1069 1070 error = ipf_nat_rule_init(softc, softn, nat); 1071 if (error != 0) 1072 goto done; 1073 1074 MUTEX_ENTER(&softn->ipf_nat_io); 1075 for (n = softn->ipf_nat_list; n != NULL; n = n->in_next) 1076 if (ipf_nat_cmp_rules(nat, n) == 0) 1077 break; 1078 } 1079 1080 switch (cmd) 1081 { 1082 #ifdef IPFILTER_LOG 1083 case SIOCIPFFB : 1084 { 1085 int tmp; 1086 1087 if (!(mode & FWRITE)) { 1088 IPFERROR(60002); 1089 error = EPERM; 1090 } else { 1091 tmp = ipf_log_clear(softc, IPL_LOGNAT); 1092 error = BCOPYOUT(&tmp, data, sizeof(tmp)); 1093 if (error != 0) { 1094 IPFERROR(60057); 1095 error = EFAULT; 1096 } 1097 } 1098 break; 1099 } 1100 1101 case SIOCSETLG : 1102 if (!(mode & FWRITE)) { 1103 IPFERROR(60003); 1104 error = EPERM; 1105 } else { 1106 error = BCOPYIN(data, &softn->ipf_nat_logging, 1107 sizeof(softn->ipf_nat_logging)); 1108 if (error != 0) 1109 error = EFAULT; 1110 } 1111 break; 1112 1113 case SIOCGETLG : 1114 error = BCOPYOUT(&softn->ipf_nat_logging, data, 1115 sizeof(softn->ipf_nat_logging)); 1116 if (error != 0) { 1117 IPFERROR(60004); 1118 error = EFAULT; 1119 } 1120 break; 1121 1122 case FIONREAD : 1123 arg = ipf_log_bytesused(softc, IPL_LOGNAT); 1124 error = BCOPYOUT(&arg, data, sizeof(arg)); 1125 if (error != 0) { 1126 IPFERROR(60005); 1127 error = EFAULT; 1128 } 1129 break; 1130 #endif 1131 case SIOCADNAT : 1132 if (!(mode & FWRITE)) { 1133 IPFERROR(60006); 1134 error = EPERM; 1135 } else if (n != NULL) { 1136 natd.in_flineno = n->in_flineno; 1137 (void) ipf_outobj(softc, data, &natd, IPFOBJ_IPNAT); 1138 IPFERROR(60007); 1139 error = EEXIST; 1140 } else if (nt == NULL) { 1141 IPFERROR(60008); 1142 error = ENOMEM; 1143 } 1144 if (error != 0) { 1145 MUTEX_EXIT(&softn->ipf_nat_io); 1146 break; 1147 } 1148 if (nat != nt) 1149 bcopy((char *)nat, (char *)nt, sizeof(*n)); 1150 error = ipf_nat_siocaddnat(softc, softn, nt, getlock); 1151 MUTEX_EXIT(&softn->ipf_nat_io); 1152 if (error == 0) { 1153 nat = NULL; 1154 nt = NULL; 1155 } 1156 break; 1157 1158 case SIOCRMNAT : 1159 case SIOCPURGENAT : 1160 if (!(mode & FWRITE)) { 1161 IPFERROR(60009); 1162 error = EPERM; 1163 n = NULL; 1164 } else if (n == NULL) { 1165 IPFERROR(60010); 1166 error = ESRCH; 1167 } 1168 1169 if (error != 0) { 1170 MUTEX_EXIT(&softn->ipf_nat_io); 1171 break; 1172 } 1173 if (cmd == (ioctlcmd_t)SIOCPURGENAT) { 1174 error = ipf_outobjsz(softc, data, n, IPFOBJ_IPNAT, 1175 n->in_size); 1176 if (error) { 1177 MUTEX_EXIT(&softn->ipf_nat_io); 1178 goto done; 1179 } 1180 n->in_flags |= IPN_PURGE; 1181 } 1182 ipf_nat_siocdelnat(softc, softn, n, getlock); 1183 1184 MUTEX_EXIT(&softn->ipf_nat_io); 1185 n = NULL; 1186 break; 1187 1188 case SIOCGNATS : 1189 { 1190 natstat_t *nsp = &softn->ipf_nat_stats; 1191 1192 nsp->ns_side[0].ns_table = softn->ipf_nat_table[0]; 1193 nsp->ns_side[1].ns_table = softn->ipf_nat_table[1]; 1194 nsp->ns_list = softn->ipf_nat_list; 1195 nsp->ns_maptable = softn->ipf_hm_maptable; 1196 nsp->ns_maplist = softn->ipf_hm_maplist; 1197 nsp->ns_nattab_sz = softn->ipf_nat_table_sz; 1198 nsp->ns_nattab_max = softn->ipf_nat_table_max; 1199 nsp->ns_rultab_sz = softn->ipf_nat_maprules_sz; 1200 nsp->ns_rdrtab_sz = softn->ipf_nat_rdrrules_sz; 1201 nsp->ns_hostmap_sz = softn->ipf_nat_hostmap_sz; 1202 nsp->ns_instances = softn->ipf_nat_instances; 1203 nsp->ns_ticks = softc->ipf_ticks; 1204 #ifdef IPFILTER_LOGGING 1205 nsp->ns_log_ok = ipf_log_logok(softc, IPF_LOGNAT); 1206 nsp->ns_log_fail = ipf_log_failures(softc, IPF_LOGNAT); 1207 #else 1208 nsp->ns_log_ok = 0; 1209 nsp->ns_log_fail = 0; 1210 #endif 1211 error = ipf_outobj(softc, data, nsp, IPFOBJ_NATSTAT); 1212 break; 1213 } 1214 1215 case SIOCGNATL : 1216 { 1217 natlookup_t nl; 1218 1219 error = ipf_inobj(softc, data, NULL, &nl, IPFOBJ_NATLOOKUP); 1220 if (error == 0) { 1221 void *ptr; 1222 1223 if (getlock) { 1224 READ_ENTER(&softc->ipf_nat); 1225 } 1226 1227 switch (nl.nl_v) 1228 { 1229 case 4 : 1230 ptr = ipf_nat_lookupredir(softc, &nl); 1231 break; 1232 #ifdef USE_INET6 1233 case 6 : 1234 ptr = ipf_nat6_lookupredir(softc, &nl); 1235 break; 1236 #endif 1237 default: 1238 ptr = NULL; 1239 break; 1240 } 1241 1242 if (getlock) { 1243 RWLOCK_EXIT(&softc->ipf_nat); 1244 } 1245 if (ptr != NULL) { 1246 error = ipf_outobj(softc, data, &nl, 1247 IPFOBJ_NATLOOKUP); 1248 } else { 1249 IPFERROR(60011); 1250 error = ESRCH; 1251 } 1252 } 1253 break; 1254 } 1255 1256 case SIOCIPFFL : /* old SIOCFLNAT & SIOCCNATL */ 1257 if (!(mode & FWRITE)) { 1258 IPFERROR(60012); 1259 error = EPERM; 1260 break; 1261 } 1262 if (getlock) { 1263 WRITE_ENTER(&softc->ipf_nat); 1264 } 1265 1266 error = BCOPYIN(data, &arg, sizeof(arg)); 1267 if (error != 0) { 1268 IPFERROR(60013); 1269 error = EFAULT; 1270 } else { 1271 if (arg == 0) 1272 ret = ipf_nat_flushtable(softc, softn); 1273 else if (arg == 1) 1274 ret = ipf_nat_clearlist(softc, softn); 1275 else 1276 ret = ipf_nat_extraflush(softc, softn, arg); 1277 ipf_proxy_flush(softc->ipf_proxy_soft, arg); 1278 } 1279 1280 if (getlock) { 1281 RWLOCK_EXIT(&softc->ipf_nat); 1282 } 1283 if (error == 0) { 1284 error = BCOPYOUT(&ret, data, sizeof(ret)); 1285 } 1286 break; 1287 1288 case SIOCMATCHFLUSH : 1289 if (!(mode & FWRITE)) { 1290 IPFERROR(60014); 1291 error = EPERM; 1292 break; 1293 } 1294 if (getlock) { 1295 WRITE_ENTER(&softc->ipf_nat); 1296 } 1297 1298 error = ipf_nat_matchflush(softc, softn, data); 1299 1300 if (getlock) { 1301 RWLOCK_EXIT(&softc->ipf_nat); 1302 } 1303 break; 1304 1305 case SIOCPROXY : 1306 error = ipf_proxy_ioctl(softc, data, cmd, mode, ctx); 1307 break; 1308 1309 case SIOCSTLCK : 1310 if (!(mode & FWRITE)) { 1311 IPFERROR(60015); 1312 error = EPERM; 1313 } else { 1314 error = ipf_lock(data, &softn->ipf_nat_lock); 1315 } 1316 break; 1317 1318 case SIOCSTPUT : 1319 if ((mode & FWRITE) != 0) { 1320 error = ipf_nat_putent(softc, data, getlock); 1321 } else { 1322 IPFERROR(60016); 1323 error = EACCES; 1324 } 1325 break; 1326 1327 case SIOCSTGSZ : 1328 if (softn->ipf_nat_lock) { 1329 error = ipf_nat_getsz(softc, data, getlock); 1330 } else { 1331 IPFERROR(60017); 1332 error = EACCES; 1333 } 1334 break; 1335 1336 case SIOCSTGET : 1337 if (softn->ipf_nat_lock) { 1338 error = ipf_nat_getent(softc, data, getlock); 1339 } else { 1340 IPFERROR(60018); 1341 error = EACCES; 1342 } 1343 break; 1344 1345 case SIOCGENITER : 1346 { 1347 ipfgeniter_t iter; 1348 ipftoken_t *token; 1349 ipfobj_t obj; 1350 1351 error = ipf_inobj(softc, data, &obj, &iter, IPFOBJ_GENITER); 1352 if (error != 0) 1353 break; 1354 1355 SPL_SCHED(s); 1356 token = ipf_token_find(softc, iter.igi_type, uid, ctx); 1357 if (token != NULL) { 1358 error = ipf_nat_iterator(softc, token, &iter, &obj); 1359 WRITE_ENTER(&softc->ipf_tokens); 1360 ipf_token_deref(softc, token); 1361 RWLOCK_EXIT(&softc->ipf_tokens); 1362 } 1363 SPL_X(s); 1364 break; 1365 } 1366 1367 case SIOCIPFDELTOK : 1368 error = BCOPYIN(data, &arg, sizeof(arg)); 1369 if (error == 0) { 1370 SPL_SCHED(s); 1371 error = ipf_token_del(softc, arg, uid, ctx); 1372 SPL_X(s); 1373 } else { 1374 IPFERROR(60019); 1375 error = EFAULT; 1376 } 1377 break; 1378 1379 case SIOCGTQTAB : 1380 error = ipf_outobj(softc, data, softn->ipf_nat_tcptq, 1381 IPFOBJ_STATETQTAB); 1382 break; 1383 1384 case SIOCGTABL : 1385 error = ipf_nat_gettable(softc, softn, data); 1386 break; 1387 1388 default : 1389 IPFERROR(60020); 1390 error = EINVAL; 1391 break; 1392 } 1393 done: 1394 if (nat != NULL) 1395 ipf_nat_rule_fini(softc, nat); 1396 if (nt != NULL) 1397 KFREES(nt, nt->in_size); 1398 return error; 1399 } 1400 1401 1402 /* ------------------------------------------------------------------------ */ 1403 /* Function: ipf_nat_siocaddnat */ 1404 /* Returns: int - 0 == success, != 0 == failure */ 1405 /* Parameters: softc(I) - pointer to soft context main structure */ 1406 /* softn(I) - pointer to NAT context structure */ 1407 /* n(I) - pointer to new NAT rule */ 1408 /* np(I) - pointer to where to insert new NAT rule */ 1409 /* getlock(I) - flag indicating if lock on is held */ 1410 /* Mutex Locks: ipf_nat_io */ 1411 /* */ 1412 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1413 /* from information passed to the kernel, then add it to the appropriate */ 1414 /* NAT rule table(s). */ 1415 /* ------------------------------------------------------------------------ */ 1416 static int 1417 ipf_nat_siocaddnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, 1418 int getlock) 1419 { 1420 int error = 0; 1421 1422 if (ipf_nat_resolverule(softc, n) != 0) { 1423 IPFERROR(60022); 1424 return ENOENT; 1425 } 1426 1427 if ((n->in_age[0] == 0) && (n->in_age[1] != 0)) { 1428 IPFERROR(60023); 1429 return EINVAL; 1430 } 1431 1432 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 1433 /* 1434 * Prerecord whether or not the destination of the divert 1435 * is local or not to the interface the packet is going 1436 * to be sent out. 1437 */ 1438 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 1439 n->in_ifps[1], &n->in_ndstip6); 1440 } 1441 1442 if (getlock) { 1443 WRITE_ENTER(&softc->ipf_nat); 1444 } 1445 n->in_next = NULL; 1446 n->in_pnext = softn->ipf_nat_list_tail; 1447 *n->in_pnext = n; 1448 softn->ipf_nat_list_tail = &n->in_next; 1449 n->in_use++; 1450 1451 if (n->in_redir & NAT_REDIRECT) { 1452 n->in_flags &= ~IPN_NOTDST; 1453 switch (n->in_v[0]) 1454 { 1455 case 4 : 1456 ipf_nat_addrdr(softn, n); 1457 break; 1458 #ifdef USE_INET6 1459 case 6 : 1460 ipf_nat6_addrdr(softn, n); 1461 break; 1462 #endif 1463 default : 1464 break; 1465 } 1466 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_rdr); 1467 } 1468 1469 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 1470 n->in_flags &= ~IPN_NOTSRC; 1471 switch (n->in_v[0]) 1472 { 1473 case 4 : 1474 ipf_nat_addmap(softn, n); 1475 break; 1476 #ifdef USE_INET6 1477 case 6 : 1478 ipf_nat6_addmap(softn, n); 1479 break; 1480 #endif 1481 default : 1482 break; 1483 } 1484 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules_map); 1485 } 1486 1487 if (n->in_age[0] != 0) 1488 n->in_tqehead[0] = ipf_addtimeoutqueue(softc, 1489 &softn->ipf_nat_utqe, 1490 n->in_age[0]); 1491 1492 if (n->in_age[1] != 0) 1493 n->in_tqehead[1] = ipf_addtimeoutqueue(softc, 1494 &softn->ipf_nat_utqe, 1495 n->in_age[1]); 1496 1497 MUTEX_INIT(&n->in_lock, "ipnat rule lock"); 1498 1499 n = NULL; 1500 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 1501 #if SOLARIS && !defined(INSTANCES) 1502 pfil_delayed_copy = 0; 1503 #endif 1504 if (getlock) { 1505 RWLOCK_EXIT(&softc->ipf_nat); /* WRITE */ 1506 } 1507 1508 return error; 1509 } 1510 1511 1512 /* ------------------------------------------------------------------------ */ 1513 /* Function: ipf_nat_ruleaddrinit */ 1514 /* Parameters: softc(I) - pointer to soft context main structure */ 1515 /* softn(I) - pointer to NAT context structure */ 1516 /* n(I) - pointer to NAT rule */ 1517 /* */ 1518 /* Initialise all of the NAT address structures in a NAT rule. */ 1519 /* ------------------------------------------------------------------------ */ 1520 static int 1521 ipf_nat_ruleaddrinit(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, 1522 ipnat_t *n) 1523 { 1524 int idx, error; 1525 1526 if ((n->in_ndst.na_atype == FRI_LOOKUP) && 1527 (n->in_ndst.na_type != IPLT_DSTLIST)) { 1528 IPFERROR(60071); 1529 return EINVAL; 1530 } 1531 if ((n->in_nsrc.na_atype == FRI_LOOKUP) && 1532 (n->in_nsrc.na_type != IPLT_DSTLIST)) { 1533 IPFERROR(60069); 1534 return EINVAL; 1535 } 1536 1537 if (n->in_redir == NAT_BIMAP) { 1538 n->in_ndstaddr = n->in_osrcaddr; 1539 n->in_ndstmsk = n->in_osrcmsk; 1540 n->in_odstaddr = n->in_nsrcaddr; 1541 n->in_odstmsk = n->in_nsrcmsk; 1542 1543 } 1544 1545 if (n->in_redir & NAT_REDIRECT) 1546 idx = 1; 1547 else 1548 idx = 0; 1549 /* 1550 * Initialise all of the address fields. 1551 */ 1552 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 1, 1553 n->in_ifps[idx]); 1554 if (error != 0) 1555 return error; 1556 1557 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 1, 1558 n->in_ifps[idx]); 1559 if (error != 0) 1560 return error; 1561 1562 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 1, 1563 n->in_ifps[idx]); 1564 if (error != 0) 1565 return error; 1566 1567 error = ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 1, 1568 n->in_ifps[idx]); 1569 if (error != 0) 1570 return error; 1571 1572 if (n->in_redir & NAT_DIVERTUDP) 1573 ipf_nat_builddivertmp(softn, n); 1574 1575 return 0; 1576 } 1577 1578 1579 /* ------------------------------------------------------------------------ */ 1580 /* Function: ipf_nat_resolvrule */ 1581 /* Returns: Nil */ 1582 /* Parameters: softc(I) - pointer to soft context main structure */ 1583 /* n(I) - pointer to NAT rule */ 1584 /* */ 1585 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1586 /* from information passed to the kernel, then add it to the appropriate */ 1587 /* NAT rule table(s). */ 1588 /* ------------------------------------------------------------------------ */ 1589 static int 1590 ipf_nat_resolverule(ipf_main_softc_t *softc, ipnat_t *n) 1591 { 1592 char *base; 1593 1594 base = n->in_names; 1595 1596 n->in_ifps[0] = ipf_resolvenic(softc, base + n->in_ifnames[0], 1597 n->in_v[0]); 1598 1599 if (n->in_ifnames[1] == -1) { 1600 n->in_ifnames[1] = n->in_ifnames[0]; 1601 n->in_ifps[1] = n->in_ifps[0]; 1602 } else { 1603 n->in_ifps[1] = ipf_resolvenic(softc, base + n->in_ifnames[1], 1604 n->in_v[1]); 1605 } 1606 1607 if (n->in_plabel != -1) { 1608 if (n->in_redir & NAT_REDIRECT) 1609 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1610 n->in_pr[0], 1611 base + n->in_plabel); 1612 else 1613 n->in_apr = ipf_proxy_lookup(softc->ipf_proxy_soft, 1614 n->in_pr[1], 1615 base + n->in_plabel); 1616 if (n->in_apr == NULL) 1617 return -1; 1618 } 1619 return 0; 1620 } 1621 1622 1623 /* ------------------------------------------------------------------------ */ 1624 /* Function: ipf_nat_siocdelnat */ 1625 /* Returns: int - 0 == success, != 0 == failure */ 1626 /* Parameters: softc(I) - pointer to soft context main structure */ 1627 /* softn(I) - pointer to NAT context structure */ 1628 /* n(I) - pointer to new NAT rule */ 1629 /* getlock(I) - flag indicating if lock on is held */ 1630 /* Mutex Locks: ipf_nat_io */ 1631 /* */ 1632 /* Handle SIOCADNAT. Resolve and calculate details inside the NAT rule */ 1633 /* from information passed to the kernel, then add it to the appropriate */ 1634 /* NAT rule table(s). */ 1635 /* ------------------------------------------------------------------------ */ 1636 static void 1637 ipf_nat_siocdelnat(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n, 1638 int getlock) 1639 { 1640 #ifdef IPF_NAT6 1641 int i; 1642 #endif 1643 1644 if (getlock) { 1645 WRITE_ENTER(&softc->ipf_nat); 1646 } 1647 1648 ipf_nat_delrule(softc, softn, n, 1); 1649 1650 if (getlock) { 1651 RWLOCK_EXIT(&softc->ipf_nat); /* READ/WRITE */ 1652 } 1653 } 1654 1655 1656 /* ------------------------------------------------------------------------ */ 1657 /* Function: ipf_nat_getsz */ 1658 /* Returns: int - 0 == success, != 0 is the error value. */ 1659 /* Parameters: softc(I) - pointer to soft context main structure */ 1660 /* data(I) - pointer to natget structure with kernel */ 1661 /* pointer get the size of. */ 1662 /* getlock(I) - flag indicating whether or not the caller */ 1663 /* holds a lock on ipf_nat */ 1664 /* */ 1665 /* Handle SIOCSTGSZ. */ 1666 /* Return the size of the nat list entry to be copied back to user space. */ 1667 /* The size of the entry is stored in the ng_sz field and the enture natget */ 1668 /* structure is copied back to the user. */ 1669 /* ------------------------------------------------------------------------ */ 1670 static int 1671 ipf_nat_getsz(ipf_main_softc_t *softc, void *data, int getlock) 1672 { 1673 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1674 ap_session_t *aps; 1675 nat_t *nat, *n; 1676 natget_t ng; 1677 int error; 1678 1679 error = BCOPYIN(data, &ng, sizeof(ng)); 1680 if (error != 0) { 1681 IPFERROR(60024); 1682 return EFAULT; 1683 } 1684 1685 if (getlock) { 1686 READ_ENTER(&softc->ipf_nat); 1687 } 1688 1689 nat = ng.ng_ptr; 1690 if (!nat) { 1691 nat = softn->ipf_nat_instances; 1692 ng.ng_sz = 0; 1693 /* 1694 * Empty list so the size returned is 0. Simple. 1695 */ 1696 if (nat == NULL) { 1697 if (getlock) { 1698 RWLOCK_EXIT(&softc->ipf_nat); 1699 } 1700 error = BCOPYOUT(&ng, data, sizeof(ng)); 1701 if (error != 0) { 1702 IPFERROR(60025); 1703 return EFAULT; 1704 } 1705 return 0; 1706 } 1707 } else { 1708 /* 1709 * Make sure the pointer we're copying from exists in the 1710 * current list of entries. Security precaution to prevent 1711 * copying of random kernel data. 1712 */ 1713 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1714 if (n == nat) 1715 break; 1716 if (n == NULL) { 1717 if (getlock) { 1718 RWLOCK_EXIT(&softc->ipf_nat); 1719 } 1720 IPFERROR(60026); 1721 return ESRCH; 1722 } 1723 } 1724 1725 /* 1726 * Incluse any space required for proxy data structures. 1727 */ 1728 ng.ng_sz = sizeof(nat_save_t); 1729 aps = nat->nat_aps; 1730 if (aps != NULL) { 1731 ng.ng_sz += sizeof(ap_session_t) - 4; 1732 if (aps->aps_data != 0) 1733 ng.ng_sz += aps->aps_psiz; 1734 } 1735 if (getlock) { 1736 RWLOCK_EXIT(&softc->ipf_nat); 1737 } 1738 1739 error = BCOPYOUT(&ng, data, sizeof(ng)); 1740 if (error != 0) { 1741 IPFERROR(60027); 1742 return EFAULT; 1743 } 1744 return 0; 1745 } 1746 1747 1748 /* ------------------------------------------------------------------------ */ 1749 /* Function: ipf_nat_getent */ 1750 /* Returns: int - 0 == success, != 0 is the error value. */ 1751 /* Parameters: softc(I) - pointer to soft context main structure */ 1752 /* data(I) - pointer to natget structure with kernel pointer*/ 1753 /* to NAT structure to copy out. */ 1754 /* getlock(I) - flag indicating whether or not the caller */ 1755 /* holds a lock on ipf_nat */ 1756 /* */ 1757 /* Handle SIOCSTGET. */ 1758 /* Copies out NAT entry to user space. Any additional data held for a */ 1759 /* proxy is also copied, as to is the NAT rule which was responsible for it */ 1760 /* ------------------------------------------------------------------------ */ 1761 static int 1762 ipf_nat_getent(ipf_main_softc_t *softc, void *data, int getlock) 1763 { 1764 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1765 int error, outsize; 1766 ap_session_t *aps; 1767 nat_save_t *ipn, ipns; 1768 nat_t *n, *nat; 1769 1770 error = ipf_inobj(softc, data, NULL, &ipns, IPFOBJ_NATSAVE); 1771 if (error != 0) 1772 return error; 1773 1774 if ((ipns.ipn_dsize < sizeof(ipns)) || (ipns.ipn_dsize > 81920)) { 1775 IPFERROR(60028); 1776 return EINVAL; 1777 } 1778 1779 KMALLOCS(ipn, nat_save_t *, ipns.ipn_dsize); 1780 if (ipn == NULL) { 1781 IPFERROR(60029); 1782 return ENOMEM; 1783 } 1784 1785 if (getlock) { 1786 READ_ENTER(&softc->ipf_nat); 1787 } 1788 1789 ipn->ipn_dsize = ipns.ipn_dsize; 1790 nat = ipns.ipn_next; 1791 if (nat == NULL) { 1792 nat = softn->ipf_nat_instances; 1793 if (nat == NULL) { 1794 if (softn->ipf_nat_instances == NULL) { 1795 IPFERROR(60030); 1796 error = ENOENT; 1797 } 1798 goto finished; 1799 } 1800 } else { 1801 /* 1802 * Make sure the pointer we're copying from exists in the 1803 * current list of entries. Security precaution to prevent 1804 * copying of random kernel data. 1805 */ 1806 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 1807 if (n == nat) 1808 break; 1809 if (n == NULL) { 1810 IPFERROR(60031); 1811 error = ESRCH; 1812 goto finished; 1813 } 1814 } 1815 ipn->ipn_next = nat->nat_next; 1816 1817 /* 1818 * Copy the NAT structure. 1819 */ 1820 bcopy((char *)nat, &ipn->ipn_nat, sizeof(*nat)); 1821 1822 /* 1823 * If we have a pointer to the NAT rule it belongs to, save that too. 1824 */ 1825 if (nat->nat_ptr != NULL) 1826 bcopy((char *)nat->nat_ptr, (char *)&ipn->ipn_ipnat, 1827 ipn->ipn_ipnat.in_size); 1828 1829 /* 1830 * If we also know the NAT entry has an associated filter rule, 1831 * save that too. 1832 */ 1833 if (nat->nat_fr != NULL) 1834 bcopy((char *)nat->nat_fr, (char *)&ipn->ipn_fr, 1835 sizeof(ipn->ipn_fr)); 1836 1837 /* 1838 * Last but not least, if there is an application proxy session set 1839 * up for this NAT entry, then copy that out too, including any 1840 * private data saved along side it by the proxy. 1841 */ 1842 aps = nat->nat_aps; 1843 outsize = ipn->ipn_dsize - sizeof(*ipn) + sizeof(ipn->ipn_data); 1844 if (aps != NULL) { 1845 char *s; 1846 1847 if (outsize < sizeof(*aps)) { 1848 IPFERROR(60032); 1849 error = ENOBUFS; 1850 goto finished; 1851 } 1852 1853 s = ipn->ipn_data; 1854 bcopy((char *)aps, s, sizeof(*aps)); 1855 s += sizeof(*aps); 1856 outsize -= sizeof(*aps); 1857 if ((aps->aps_data != NULL) && (outsize >= aps->aps_psiz)) 1858 bcopy(aps->aps_data, s, aps->aps_psiz); 1859 else { 1860 IPFERROR(60033); 1861 error = ENOBUFS; 1862 } 1863 } 1864 if (error == 0) { 1865 if (getlock) { 1866 READ_ENTER(&softc->ipf_nat); 1867 getlock = 0; 1868 } 1869 error = ipf_outobjsz(softc, data, ipn, IPFOBJ_NATSAVE, 1870 ipns.ipn_dsize); 1871 } 1872 1873 finished: 1874 if (getlock) { 1875 READ_ENTER(&softc->ipf_nat); 1876 } 1877 if (ipn != NULL) { 1878 KFREES(ipn, ipns.ipn_dsize); 1879 } 1880 return error; 1881 } 1882 1883 1884 /* ------------------------------------------------------------------------ */ 1885 /* Function: ipf_nat_putent */ 1886 /* Returns: int - 0 == success, != 0 is the error value. */ 1887 /* Parameters: softc(I) - pointer to soft context main structure */ 1888 /* data(I) - pointer to natget structure with NAT */ 1889 /* structure information to load into the kernel */ 1890 /* getlock(I) - flag indicating whether or not a write lock */ 1891 /* on is already held. */ 1892 /* */ 1893 /* Handle SIOCSTPUT. */ 1894 /* Loads a NAT table entry from user space, including a NAT rule, proxy and */ 1895 /* firewall rule data structures, if pointers to them indicate so. */ 1896 /* ------------------------------------------------------------------------ */ 1897 static int 1898 ipf_nat_putent(ipf_main_softc_t *softc, void *data, int getlock) 1899 { 1900 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 1901 nat_save_t *ipn, *ipnn; 1902 ap_session_t *aps; 1903 nat_t *n, *nat; 1904 frentry_t *fr; 1905 fr_info_t *fin; 1906 ipnat_t *in; 1907 int error; 1908 1909 KMALLOC(ipn, nat_save_t *); 1910 if (ipn == NULL) 1911 return ENOMEM; 1912 error = ipf_inobj(softc, data, NULL, ipn, IPFOBJ_NATSAVE); 1913 if (error != 0) 1914 return error; 1915 1916 /* 1917 * Initialise early because of code at junkput label. 1918 */ 1919 n = NULL; 1920 in = NULL; 1921 aps = NULL; 1922 nat = NULL; 1923 ipnn = NULL; 1924 fin = NULL; 1925 fr = NULL; 1926 1927 /* 1928 * New entry, copy in the rest of the NAT entry if it's size is more 1929 * than just the nat_t structure. 1930 */ 1931 if (ipn->ipn_dsize > sizeof(*ipn)) { 1932 if (ipn->ipn_dsize > 81920) { 1933 IPFERROR(60034); 1934 error = ENOMEM; 1935 goto junkput; 1936 } 1937 1938 KMALLOCS(ipnn, nat_save_t *, ipn->ipn_dsize); 1939 if (ipnn == NULL) { 1940 IPFERROR(60035); 1941 return ENOMEM; 1942 } 1943 1944 bzero(ipnn, ipn->ipn_dsize); 1945 error = ipf_inobjsz(softc, data, ipnn, IPFOBJ_NATSAVE, 1946 ipn->ipn_dsize); 1947 if (error != 0) { 1948 goto junkput; 1949 } 1950 } else 1951 ipnn = ipn; 1952 1953 KMALLOC(nat, nat_t *); 1954 if (nat == NULL) { 1955 IPFERROR(60037); 1956 error = ENOMEM; 1957 goto junkput; 1958 } 1959 1960 bcopy((char *)&ipnn->ipn_nat, (char *)nat, sizeof(*nat)); 1961 1962 switch (nat->nat_v[0]) 1963 { 1964 case 4: 1965 #ifdef USE_IENT6 1966 case 6 : 1967 #endif 1968 break; 1969 default : 1970 IPFERROR(60061); 1971 error = EPROTONOSUPPORT; 1972 goto junkput; 1973 /*NOTREACHED*/ 1974 } 1975 1976 /* 1977 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 1978 */ 1979 bzero((char *)nat, offsetof(struct nat, nat_tqe)); 1980 nat->nat_tqe.tqe_pnext = NULL; 1981 nat->nat_tqe.tqe_next = NULL; 1982 nat->nat_tqe.tqe_ifq = NULL; 1983 nat->nat_tqe.tqe_parent = nat; 1984 1985 /* 1986 * Restore the rule associated with this nat session 1987 */ 1988 in = ipnn->ipn_nat.nat_ptr; 1989 if (in != NULL) { 1990 KMALLOCS(in, ipnat_t *, ipnn->ipn_ipnat.in_size); 1991 nat->nat_ptr = in; 1992 if (in == NULL) { 1993 IPFERROR(60038); 1994 error = ENOMEM; 1995 goto junkput; 1996 } 1997 bcopy((char *)&ipnn->ipn_ipnat, (char *)in, 1998 ipnn->ipn_ipnat.in_size); 1999 in->in_use = 1; 2000 in->in_flags |= IPN_DELETE; 2001 2002 ATOMIC_INC32(softn->ipf_nat_stats.ns_rules); 2003 2004 if (ipf_nat_resolverule(softc, in) != 0) { 2005 IPFERROR(60039); 2006 error = ESRCH; 2007 goto junkput; 2008 } 2009 } 2010 2011 /* 2012 * Check that the NAT entry doesn't already exist in the kernel. 2013 * 2014 * For NAT_OUTBOUND, we're lookup for a duplicate MAP entry. To do 2015 * this, we check to see if the inbound combination of addresses and 2016 * ports is already known. Similar logic is applied for NAT_INBOUND. 2017 * 2018 */ 2019 KMALLOC(fin, fr_info_t *); 2020 if (fin == NULL) { 2021 error = ENOMEM; 2022 goto junkput; 2023 } 2024 bzero(fin, sizeof(*fin)); 2025 fin->fin_v = nat->nat_v[0]; 2026 fin->fin_p = nat->nat_pr[0]; 2027 fin->fin_rev = nat->nat_rev; 2028 fin->fin_ifp = nat->nat_ifps[0]; 2029 fin->fin_data[0] = ntohs(nat->nat_ndport); 2030 fin->fin_data[1] = ntohs(nat->nat_nsport); 2031 2032 switch (nat->nat_dir) 2033 { 2034 case NAT_OUTBOUND : 2035 case NAT_DIVERTOUT : 2036 if (getlock) { 2037 READ_ENTER(&softc->ipf_nat); 2038 } 2039 2040 fin->fin_v = nat->nat_v[1]; 2041 if (nat->nat_v[1] == 4) { 2042 n = ipf_nat_inlookup(fin, nat->nat_flags, fin->fin_p, 2043 nat->nat_ndstip, nat->nat_nsrcip); 2044 #ifdef USE_INET6 2045 } else if (nat->nat_v[1] == 6) { 2046 n = ipf_nat6_inlookup(fin, nat->nat_flags, fin->fin_p, 2047 &nat->nat_ndst6.in6, 2048 &nat->nat_nsrc6.in6); 2049 #endif 2050 } 2051 2052 if (getlock) { 2053 RWLOCK_EXIT(&softc->ipf_nat); 2054 } 2055 if (n != NULL) { 2056 IPFERROR(60040); 2057 error = EEXIST; 2058 goto junkput; 2059 } 2060 break; 2061 2062 case NAT_INBOUND : 2063 case NAT_DIVERTIN : 2064 if (getlock) { 2065 READ_ENTER(&softc->ipf_nat); 2066 } 2067 2068 if (fin->fin_v == 4) { 2069 n = ipf_nat_outlookup(fin, nat->nat_flags, fin->fin_p, 2070 nat->nat_ndstip, 2071 nat->nat_nsrcip); 2072 #ifdef USE_INET6 2073 } else if (fin->fin_v == 6) { 2074 n = ipf_nat6_outlookup(fin, nat->nat_flags, fin->fin_p, 2075 &nat->nat_ndst6.in6, 2076 &nat->nat_nsrc6.in6); 2077 #endif 2078 } 2079 2080 if (getlock) { 2081 RWLOCK_EXIT(&softc->ipf_nat); 2082 } 2083 if (n != NULL) { 2084 IPFERROR(60041); 2085 error = EEXIST; 2086 goto junkput; 2087 } 2088 break; 2089 2090 default : 2091 IPFERROR(60042); 2092 error = EINVAL; 2093 goto junkput; 2094 } 2095 2096 /* 2097 * Restore ap_session_t structure. Include the private data allocated 2098 * if it was there. 2099 */ 2100 aps = nat->nat_aps; 2101 if (aps != NULL) { 2102 KMALLOC(aps, ap_session_t *); 2103 nat->nat_aps = aps; 2104 if (aps == NULL) { 2105 IPFERROR(60043); 2106 error = ENOMEM; 2107 goto junkput; 2108 } 2109 bcopy(ipnn->ipn_data, (char *)aps, sizeof(*aps)); 2110 if (in != NULL) 2111 aps->aps_apr = in->in_apr; 2112 else 2113 aps->aps_apr = NULL; 2114 if (aps->aps_psiz != 0) { 2115 if (aps->aps_psiz > 81920) { 2116 IPFERROR(60044); 2117 error = ENOMEM; 2118 goto junkput; 2119 } 2120 KMALLOCS(aps->aps_data, void *, aps->aps_psiz); 2121 if (aps->aps_data == NULL) { 2122 IPFERROR(60045); 2123 error = ENOMEM; 2124 goto junkput; 2125 } 2126 bcopy(ipnn->ipn_data + sizeof(*aps), aps->aps_data, 2127 aps->aps_psiz); 2128 } else { 2129 aps->aps_psiz = 0; 2130 aps->aps_data = NULL; 2131 } 2132 } 2133 2134 /* 2135 * If there was a filtering rule associated with this entry then 2136 * build up a new one. 2137 */ 2138 fr = nat->nat_fr; 2139 if (fr != NULL) { 2140 if ((nat->nat_flags & SI_NEWFR) != 0) { 2141 KMALLOC(fr, frentry_t *); 2142 nat->nat_fr = fr; 2143 if (fr == NULL) { 2144 IPFERROR(60046); 2145 error = ENOMEM; 2146 goto junkput; 2147 } 2148 ipnn->ipn_nat.nat_fr = fr; 2149 fr->fr_ref = 1; 2150 (void) ipf_outobj(softc, data, ipnn, IPFOBJ_NATSAVE); 2151 bcopy((char *)&ipnn->ipn_fr, (char *)fr, sizeof(*fr)); 2152 2153 fr->fr_ref = 1; 2154 fr->fr_dsize = 0; 2155 fr->fr_data = NULL; 2156 fr->fr_type = FR_T_NONE; 2157 2158 MUTEX_NUKE(&fr->fr_lock); 2159 MUTEX_INIT(&fr->fr_lock, "nat-filter rule lock"); 2160 } else { 2161 if (getlock) { 2162 READ_ENTER(&softc->ipf_nat); 2163 } 2164 for (n = softn->ipf_nat_instances; n; n = n->nat_next) 2165 if (n->nat_fr == fr) 2166 break; 2167 2168 if (n != NULL) { 2169 MUTEX_ENTER(&fr->fr_lock); 2170 fr->fr_ref++; 2171 MUTEX_EXIT(&fr->fr_lock); 2172 } 2173 if (getlock) { 2174 RWLOCK_EXIT(&softc->ipf_nat); 2175 } 2176 2177 if (n == NULL) { 2178 IPFERROR(60047); 2179 error = ESRCH; 2180 goto junkput; 2181 } 2182 } 2183 } 2184 2185 if (ipnn != ipn) { 2186 KFREES(ipnn, ipn->ipn_dsize); 2187 ipnn = NULL; 2188 } 2189 2190 if (getlock) { 2191 WRITE_ENTER(&softc->ipf_nat); 2192 } 2193 2194 if (fin->fin_v == 4) 2195 error = ipf_nat_finalise(fin, nat); 2196 #ifdef USE_INET6 2197 else 2198 error = ipf_nat6_finalise(fin, nat); 2199 #endif 2200 2201 if (getlock) { 2202 RWLOCK_EXIT(&softc->ipf_nat); 2203 } 2204 2205 if (error == 0) 2206 return 0; 2207 2208 IPFERROR(60048); 2209 error = ENOMEM; 2210 2211 junkput: 2212 if (fin != NULL) 2213 KFREE(fin); 2214 if (fr != NULL) { 2215 (void) ipf_derefrule(softc, &fr); 2216 } 2217 2218 if ((ipnn != NULL) && (ipnn != ipn)) { 2219 KFREES(ipnn, ipn->ipn_dsize); 2220 } 2221 if (ipn != NULL) 2222 KFREE(ipn); 2223 if (nat != NULL) { 2224 if (aps != NULL) { 2225 if (aps->aps_data != NULL) { 2226 KFREES(aps->aps_data, aps->aps_psiz); 2227 } 2228 KFREE(aps); 2229 } 2230 if (in != NULL) { 2231 if (in->in_apr) 2232 ipf_proxy_deref(in->in_apr); 2233 KFREES(in, in->in_size); 2234 } 2235 KFREE(nat); 2236 } 2237 return error; 2238 } 2239 2240 2241 /* ------------------------------------------------------------------------ */ 2242 /* Function: ipf_nat_delete */ 2243 /* Returns: Nil */ 2244 /* Parameters: softc(I) - pointer to soft context main structure */ 2245 /* nat(I) - pointer to NAT structure to delete */ 2246 /* logtype(I) - type of LOG record to create before deleting */ 2247 /* Write Lock: ipf_nat */ 2248 /* */ 2249 /* Delete a nat entry from the various lists and table. If NAT logging is */ 2250 /* enabled then generate a NAT log record for this event. */ 2251 /* ------------------------------------------------------------------------ */ 2252 void 2253 ipf_nat_delete(ipf_main_softc_t *softc, struct nat *nat, int logtype) 2254 { 2255 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2256 int madeorphan = 0, removed = 0; 2257 u_int bkt; 2258 nat_stat_side_t *nss; 2259 struct ipnat *ipn; 2260 2261 if (logtype != 0 && softn->ipf_nat_logging != 0) 2262 ipf_nat_log(softc, softn, nat, logtype); 2263 2264 /* 2265 * Take it as a general indication that all the pointers are set if 2266 * nat_pnext is set. 2267 */ 2268 if (nat->nat_pnext != NULL) { 2269 removed = 1; 2270 2271 bkt = nat->nat_hv[0] % softn->ipf_nat_table_sz; 2272 nss = &softn->ipf_nat_stats.ns_side[0]; 2273 ASSERT(nss->ns_bucketlen[bkt] > 0); 2274 nss->ns_bucketlen[bkt]--; 2275 if (nss->ns_bucketlen[bkt] == 0) { 2276 nss->ns_inuse--; 2277 } 2278 2279 bkt = nat->nat_hv[1] % softn->ipf_nat_table_sz; 2280 nss = &softn->ipf_nat_stats.ns_side[1]; 2281 ASSERT(nss->ns_bucketlen[bkt] > 0); 2282 nss->ns_bucketlen[bkt]--; 2283 if (nss->ns_bucketlen[bkt] == 0) { 2284 nss->ns_inuse--; 2285 } 2286 2287 *nat->nat_pnext = nat->nat_next; 2288 if (nat->nat_next != NULL) { 2289 nat->nat_next->nat_pnext = nat->nat_pnext; 2290 nat->nat_next = NULL; 2291 } 2292 nat->nat_pnext = NULL; 2293 2294 *nat->nat_phnext[0] = nat->nat_hnext[0]; 2295 if (nat->nat_hnext[0] != NULL) { 2296 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 2297 nat->nat_hnext[0] = NULL; 2298 } 2299 nat->nat_phnext[0] = NULL; 2300 2301 *nat->nat_phnext[1] = nat->nat_hnext[1]; 2302 if (nat->nat_hnext[1] != NULL) { 2303 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 2304 nat->nat_hnext[1] = NULL; 2305 } 2306 nat->nat_phnext[1] = NULL; 2307 2308 if ((nat->nat_flags & SI_WILDP) != 0) { 2309 ATOMIC_DEC32(softn->ipf_nat_stats.ns_wilds); 2310 } 2311 madeorphan = 1; 2312 } 2313 2314 if (nat->nat_me != NULL) { 2315 *nat->nat_me = NULL; 2316 nat->nat_me = NULL; 2317 nat->nat_ref--; 2318 ASSERT(nat->nat_ref >= 0); 2319 } 2320 2321 if (nat->nat_tqe.tqe_ifq != NULL) { 2322 /* 2323 * No call to ipf_freetimeoutqueue() is made here, they are 2324 * garbage collected in ipf_nat_expire(). 2325 */ 2326 (void) ipf_deletequeueentry(&nat->nat_tqe); 2327 } 2328 2329 if (nat->nat_sync) { 2330 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 2331 nat->nat_sync = NULL; 2332 } 2333 2334 if (logtype == NL_EXPIRE) 2335 softn->ipf_nat_stats.ns_expire++; 2336 2337 MUTEX_ENTER(&nat->nat_lock); 2338 /* 2339 * NL_DESTROY should only be passed in when we've got nat_ref >= 2. 2340 * This happens when a nat'd packet is blocked and we want to throw 2341 * away the NAT session. 2342 */ 2343 if (logtype == NL_DESTROY) { 2344 if (nat->nat_ref > 2) { 2345 nat->nat_ref -= 2; 2346 MUTEX_EXIT(&nat->nat_lock); 2347 if (removed) 2348 softn->ipf_nat_stats.ns_orphans++; 2349 return; 2350 } 2351 } else if (nat->nat_ref > 1) { 2352 nat->nat_ref--; 2353 MUTEX_EXIT(&nat->nat_lock); 2354 if (madeorphan == 1) 2355 softn->ipf_nat_stats.ns_orphans++; 2356 return; 2357 } 2358 ASSERT(nat->nat_ref >= 0); 2359 MUTEX_EXIT(&nat->nat_lock); 2360 2361 nat->nat_ref = 0; 2362 2363 if (madeorphan == 0) 2364 softn->ipf_nat_stats.ns_orphans--; 2365 2366 /* 2367 * At this point, nat_ref can be either 0 or -1 2368 */ 2369 softn->ipf_nat_stats.ns_proto[nat->nat_pr[0]]--; 2370 2371 if (nat->nat_fr != NULL) { 2372 (void) ipf_derefrule(softc, &nat->nat_fr); 2373 } 2374 2375 if (nat->nat_hm != NULL) { 2376 ipf_nat_hostmapdel(softc, &nat->nat_hm); 2377 } 2378 2379 /* 2380 * If there is an active reference from the nat entry to its parent 2381 * rule, decrement the rule's reference count and free it too if no 2382 * longer being used. 2383 */ 2384 ipn = nat->nat_ptr; 2385 nat->nat_ptr = NULL; 2386 2387 if (ipn != NULL) { 2388 ipn->in_space++; 2389 ipf_nat_rule_deref(softc, &ipn); 2390 } 2391 2392 if (nat->nat_aps != NULL) { 2393 ipf_proxy_free(softc, nat->nat_aps); 2394 nat->nat_aps = NULL; 2395 } 2396 2397 MUTEX_DESTROY(&nat->nat_lock); 2398 2399 softn->ipf_nat_stats.ns_active--; 2400 2401 /* 2402 * If there's a fragment table entry too for this nat entry, then 2403 * dereference that as well. This is after nat_lock is released 2404 * because of Tru64. 2405 */ 2406 ipf_frag_natforget(softc, (void *)nat); 2407 2408 KFREE(nat); 2409 } 2410 2411 2412 /* ------------------------------------------------------------------------ */ 2413 /* Function: ipf_nat_flushtable */ 2414 /* Returns: int - number of NAT rules deleted */ 2415 /* Parameters: softc(I) - pointer to soft context main structure */ 2416 /* softn(I) - pointer to NAT context structure */ 2417 /* Write Lock: ipf_nat */ 2418 /* */ 2419 /* Deletes all currently active NAT sessions. In deleting each NAT entry a */ 2420 /* log record should be emitted in ipf_nat_delete() if NAT logging is */ 2421 /* enabled. */ 2422 /* ------------------------------------------------------------------------ */ 2423 /* 2424 * nat_flushtable - clear the NAT table of all mapping entries. 2425 */ 2426 static int 2427 ipf_nat_flushtable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) 2428 { 2429 nat_t *nat; 2430 int j = 0; 2431 2432 /* 2433 * ALL NAT mappings deleted, so lets just make the deletions 2434 * quicker. 2435 */ 2436 if (softn->ipf_nat_table[0] != NULL) 2437 bzero((char *)softn->ipf_nat_table[0], 2438 sizeof(softn->ipf_nat_table[0]) * 2439 softn->ipf_nat_table_sz); 2440 if (softn->ipf_nat_table[1] != NULL) 2441 bzero((char *)softn->ipf_nat_table[1], 2442 sizeof(softn->ipf_nat_table[1]) * 2443 softn->ipf_nat_table_sz); 2444 2445 while ((nat = softn->ipf_nat_instances) != NULL) { 2446 ipf_nat_delete(softc, nat, NL_FLUSH); 2447 j++; 2448 } 2449 2450 return j; 2451 } 2452 2453 2454 /* ------------------------------------------------------------------------ */ 2455 /* Function: ipf_nat_clearlist */ 2456 /* Returns: int - number of NAT/RDR rules deleted */ 2457 /* Parameters: softc(I) - pointer to soft context main structure */ 2458 /* softn(I) - pointer to NAT context structure */ 2459 /* */ 2460 /* Delete all rules in the current list of rules. There is nothing elegant */ 2461 /* about this cleanup: simply free all entries on the list of rules and */ 2462 /* clear out the tables used for hashed NAT rule lookups. */ 2463 /* ------------------------------------------------------------------------ */ 2464 static int 2465 ipf_nat_clearlist(ipf_main_softc_t *softc, ipf_nat_softc_t *softn) 2466 { 2467 ipnat_t *n; 2468 int i = 0; 2469 2470 if (softn->ipf_nat_map_rules != NULL) { 2471 bzero((char *)softn->ipf_nat_map_rules, 2472 sizeof(*softn->ipf_nat_map_rules) * 2473 softn->ipf_nat_maprules_sz); 2474 } 2475 if (softn->ipf_nat_rdr_rules != NULL) { 2476 bzero((char *)softn->ipf_nat_rdr_rules, 2477 sizeof(*softn->ipf_nat_rdr_rules) * 2478 softn->ipf_nat_rdrrules_sz); 2479 } 2480 2481 while ((n = softn->ipf_nat_list) != NULL) { 2482 ipf_nat_delrule(softc, softn, n, 0); 2483 i++; 2484 } 2485 #if SOLARIS && !defined(INSTANCES) 2486 pfil_delayed_copy = 1; 2487 #endif 2488 return i; 2489 } 2490 2491 2492 /* ------------------------------------------------------------------------ */ 2493 /* Function: ipf_nat_delrule */ 2494 /* Returns: Nil */ 2495 /* Parameters: softc(I) - pointer to soft context main structure */ 2496 /* softn(I) - pointer to NAT context structure */ 2497 /* np(I) - pointer to NAT rule to delete */ 2498 /* purge(I) - 1 == allow purge, 0 == prevent purge */ 2499 /* Locks: WRITE(ipf_nat) */ 2500 /* */ 2501 /* Preventing "purge" from occuring is allowed because when all of the NAT */ 2502 /* rules are being removed, allowing the "purge" to walk through the list */ 2503 /* of NAT sessions, possibly multiple times, would be a large performance */ 2504 /* hit, on the order of O(N^2). */ 2505 /* ------------------------------------------------------------------------ */ 2506 static void 2507 ipf_nat_delrule(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *np, 2508 int purge) 2509 { 2510 2511 if (np->in_pnext != NULL) { 2512 *np->in_pnext = np->in_next; 2513 if (np->in_next != NULL) 2514 np->in_next->in_pnext = np->in_pnext; 2515 if (softn->ipf_nat_list_tail == &np->in_next) 2516 softn->ipf_nat_list_tail = np->in_pnext; 2517 } 2518 2519 if ((purge == 1) && ((np->in_flags & IPN_PURGE) != 0)) { 2520 nat_t *next; 2521 nat_t *nat; 2522 2523 for (next = softn->ipf_nat_instances; (nat = next) != NULL;) { 2524 next = nat->nat_next; 2525 if (nat->nat_ptr == np) 2526 ipf_nat_delete(softc, nat, NL_PURGE); 2527 } 2528 } 2529 2530 if ((np->in_flags & IPN_DELETE) == 0) { 2531 if (np->in_redir & NAT_REDIRECT) { 2532 switch (np->in_v[0]) 2533 { 2534 case 4 : 2535 ipf_nat_delrdr(softn, np); 2536 break; 2537 #ifdef USE_INET6 2538 case 6 : 2539 ipf_nat6_delrdr(softn, np); 2540 break; 2541 #endif 2542 } 2543 } 2544 if (np->in_redir & (NAT_MAPBLK|NAT_MAP)) { 2545 switch (np->in_v[0]) 2546 { 2547 case 4 : 2548 ipf_nat_delmap(softn, np); 2549 break; 2550 #ifdef USE_INET6 2551 case 6 : 2552 ipf_nat6_delmap(softn, np); 2553 break; 2554 #endif 2555 } 2556 } 2557 } 2558 2559 np->in_flags |= IPN_DELETE; 2560 ipf_nat_rule_deref(softc, &np); 2561 } 2562 2563 2564 /* ------------------------------------------------------------------------ */ 2565 /* Function: ipf_nat_newmap */ 2566 /* Returns: int - -1 == error, 0 == success */ 2567 /* Parameters: fin(I) - pointer to packet information */ 2568 /* nat(I) - pointer to NAT entry */ 2569 /* ni(I) - pointer to structure with misc. information needed */ 2570 /* to create new NAT entry. */ 2571 /* */ 2572 /* Given an empty NAT structure, populate it with new information about a */ 2573 /* new NAT session, as defined by the matching NAT rule. */ 2574 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2575 /* to the new IP address for the translation. */ 2576 /* ------------------------------------------------------------------------ */ 2577 static int 2578 ipf_nat_newmap(fr_info_t *fin, nat_t *nat, natinfo_t *ni) 2579 { 2580 ipf_main_softc_t *softc = fin->fin_main_soft; 2581 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2582 u_short st_port, dport, sport, port, sp, dp; 2583 struct in_addr in, inb; 2584 hostmap_t *hm; 2585 u_32_t flags; 2586 u_32_t st_ip; 2587 ipnat_t *np; 2588 nat_t *natl; 2589 int l; 2590 2591 /* 2592 * If it's an outbound packet which doesn't match any existing 2593 * record, then create a new port 2594 */ 2595 l = 0; 2596 hm = NULL; 2597 np = ni->nai_np; 2598 st_ip = np->in_snip; 2599 st_port = np->in_spnext; 2600 flags = nat->nat_flags; 2601 2602 if (flags & IPN_ICMPQUERY) { 2603 sport = fin->fin_data[1]; 2604 dport = 0; 2605 } else { 2606 sport = htons(fin->fin_data[0]); 2607 dport = htons(fin->fin_data[1]); 2608 } 2609 2610 /* 2611 * Do a loop until we either run out of entries to try or we find 2612 * a NAT mapping that isn't currently being used. This is done 2613 * because the change to the source is not (usually) being fixed. 2614 */ 2615 do { 2616 port = 0; 2617 in.s_addr = htonl(np->in_snip); 2618 if (l == 0) { 2619 /* 2620 * Check to see if there is an existing NAT 2621 * setup for this IP address pair. 2622 */ 2623 hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2624 fin->fin_dst, in, 0); 2625 if (hm != NULL) 2626 in.s_addr = hm->hm_nsrcip.s_addr; 2627 } else if ((l == 1) && (hm != NULL)) { 2628 ipf_nat_hostmapdel(softc, &hm); 2629 } 2630 in.s_addr = ntohl(in.s_addr); 2631 2632 nat->nat_hm = hm; 2633 2634 if ((np->in_nsrcmsk == 0xffffffff) && (np->in_spnext == 0)) { 2635 if (l > 0) { 2636 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_1); 2637 return -1; 2638 } 2639 } 2640 2641 if (np->in_redir == NAT_BIMAP && 2642 np->in_osrcmsk == np->in_nsrcmsk) { 2643 /* 2644 * map the address block in a 1:1 fashion 2645 */ 2646 in.s_addr = np->in_nsrcaddr; 2647 in.s_addr |= fin->fin_saddr & ~np->in_osrcmsk; 2648 in.s_addr = ntohl(in.s_addr); 2649 2650 } else if (np->in_redir & NAT_MAPBLK) { 2651 if ((l >= np->in_ppip) || ((l > 0) && 2652 !(flags & IPN_TCPUDP))) { 2653 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_2); 2654 return -1; 2655 } 2656 /* 2657 * map-block - Calculate destination address. 2658 */ 2659 in.s_addr = ntohl(fin->fin_saddr); 2660 in.s_addr &= ntohl(~np->in_osrcmsk); 2661 inb.s_addr = in.s_addr; 2662 in.s_addr /= np->in_ippip; 2663 in.s_addr &= ntohl(~np->in_nsrcmsk); 2664 in.s_addr += ntohl(np->in_nsrcaddr); 2665 /* 2666 * Calculate destination port. 2667 */ 2668 if ((flags & IPN_TCPUDP) && 2669 (np->in_ppip != 0)) { 2670 port = ntohs(sport) + l; 2671 port %= np->in_ppip; 2672 port += np->in_ppip * 2673 (inb.s_addr % np->in_ippip); 2674 port += MAPBLK_MINPORT; 2675 port = htons(port); 2676 } 2677 2678 } else if ((np->in_nsrcaddr == 0) && 2679 (np->in_nsrcmsk == 0xffffffff)) { 2680 i6addr_t in6; 2681 2682 /* 2683 * 0/32 - use the interface's IP address. 2684 */ 2685 if ((l > 0) || 2686 ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2687 &in6, NULL) == -1) { 2688 NBUMPSIDEX(1, ns_new_ifpaddr, ns_new_ifpaddr_1); 2689 return -1; 2690 } 2691 in.s_addr = ntohl(in6.in4.s_addr); 2692 2693 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 2694 /* 2695 * 0/0 - use the original source address/port. 2696 */ 2697 if (l > 0) { 2698 NBUMPSIDEX(1, ns_exhausted, ns_exhausted_3); 2699 return -1; 2700 } 2701 in.s_addr = ntohl(fin->fin_saddr); 2702 2703 } else if ((np->in_nsrcmsk != 0xffffffff) && 2704 (np->in_spnext == 0) && ((l > 0) || (hm == NULL))) 2705 np->in_snip++; 2706 2707 natl = NULL; 2708 2709 if ((flags & IPN_TCPUDP) && 2710 ((np->in_redir & NAT_MAPBLK) == 0) && 2711 (np->in_flags & IPN_AUTOPORTMAP)) { 2712 /* 2713 * "ports auto" (without map-block) 2714 */ 2715 if ((l > 0) && np->in_ppip && (l % np->in_ppip == 0)) { 2716 if (l > np->in_space) { 2717 return -1; 2718 } else if ((l > np->in_ppip) && 2719 np->in_nsrcmsk != 0xffffffff) 2720 np->in_snip++; 2721 } 2722 if (np->in_ppip != 0) { 2723 port = ntohs(sport); 2724 port += (l % np->in_ppip); 2725 port %= np->in_ppip; 2726 port += np->in_ppip * 2727 (ntohl(fin->fin_saddr) % 2728 np->in_ippip); 2729 port += MAPBLK_MINPORT; 2730 port = htons(port); 2731 } 2732 2733 } else if (((np->in_redir & NAT_MAPBLK) == 0) && 2734 (flags & IPN_TCPUDPICMP) && (np->in_spnext != 0)) { 2735 /* 2736 * Standard port translation. Select next port. 2737 */ 2738 if (np->in_flags & IPN_SEQUENTIAL) { 2739 port = np->in_spnext; 2740 } else { 2741 port = ipf_random() % (np->in_spmax - 2742 np->in_spmin + 1); 2743 port += np->in_spmin; 2744 } 2745 port = htons(port); 2746 np->in_spnext++; 2747 2748 if (np->in_spnext > np->in_spmax) { 2749 np->in_spnext = np->in_spmin; 2750 if (np->in_nsrcmsk != 0xffffffff) 2751 np->in_snip++; 2752 } 2753 } 2754 2755 if (np->in_flags & IPN_SIPRANGE) { 2756 if (np->in_snip > ntohl(np->in_nsrcmsk)) 2757 np->in_snip = ntohl(np->in_nsrcaddr); 2758 } else { 2759 if ((np->in_nsrcmsk != 0xffffffff) && 2760 ((np->in_snip + 1) & ntohl(np->in_nsrcmsk)) > 2761 ntohl(np->in_nsrcaddr)) 2762 np->in_snip = ntohl(np->in_nsrcaddr) + 1; 2763 } 2764 2765 if ((port == 0) && (flags & (IPN_TCPUDPICMP|IPN_ICMPQUERY))) 2766 port = sport; 2767 2768 /* 2769 * Here we do a lookup of the connection as seen from 2770 * the outside. If an IP# pair already exists, try 2771 * again. So if you have A->B becomes C->B, you can 2772 * also have D->E become C->E but not D->B causing 2773 * another C->B. Also take protocol and ports into 2774 * account when determining whether a pre-existing 2775 * NAT setup will cause an external conflict where 2776 * this is appropriate. 2777 */ 2778 inb.s_addr = htonl(in.s_addr); 2779 sp = fin->fin_data[0]; 2780 dp = fin->fin_data[1]; 2781 fin->fin_data[0] = fin->fin_data[1]; 2782 fin->fin_data[1] = ntohs(port); 2783 natl = ipf_nat_inlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 2784 (u_int)fin->fin_p, fin->fin_dst, inb); 2785 fin->fin_data[0] = sp; 2786 fin->fin_data[1] = dp; 2787 2788 /* 2789 * Has the search wrapped around and come back to the 2790 * start ? 2791 */ 2792 if ((natl != NULL) && 2793 (np->in_spnext != 0) && (st_port == np->in_spnext) && 2794 (np->in_snip != 0) && (st_ip == np->in_snip)) { 2795 NBUMPSIDED(1, ns_wrap); 2796 return -1; 2797 } 2798 l++; 2799 } while (natl != NULL); 2800 2801 /* Setup the NAT table */ 2802 nat->nat_osrcip = fin->fin_src; 2803 nat->nat_nsrcaddr = htonl(in.s_addr); 2804 nat->nat_odstip = fin->fin_dst; 2805 nat->nat_ndstip = fin->fin_dst; 2806 if (nat->nat_hm == NULL) 2807 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 2808 fin->fin_dst, nat->nat_nsrcip, 2809 0); 2810 2811 if (flags & IPN_TCPUDP) { 2812 nat->nat_osport = sport; 2813 nat->nat_nsport = port; /* sport */ 2814 nat->nat_odport = dport; 2815 nat->nat_ndport = dport; 2816 ((tcphdr_t *)fin->fin_dp)->th_sport = port; 2817 } else if (flags & IPN_ICMPQUERY) { 2818 nat->nat_oicmpid = fin->fin_data[1]; 2819 ((icmphdr_t *)fin->fin_dp)->icmp_id = port; 2820 nat->nat_nicmpid = port; 2821 } 2822 return 0; 2823 } 2824 2825 2826 /* ------------------------------------------------------------------------ */ 2827 /* Function: ipf_nat_newrdr */ 2828 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 2829 /* allow rule to be moved if IPN_ROUNDR is set. */ 2830 /* Parameters: fin(I) - pointer to packet information */ 2831 /* nat(I) - pointer to NAT entry */ 2832 /* ni(I) - pointer to structure with misc. information needed */ 2833 /* to create new NAT entry. */ 2834 /* */ 2835 /* ni.nai_ip is passed in uninitialised and must be set, in host byte order,*/ 2836 /* to the new IP address for the translation. */ 2837 /* ------------------------------------------------------------------------ */ 2838 static int 2839 ipf_nat_newrdr(fr_info_t *fin, nat_t *nat, natinfo_t *ni) 2840 { 2841 ipf_main_softc_t *softc = fin->fin_main_soft; 2842 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 2843 u_short nport, dport, sport; 2844 struct in_addr in, inb; 2845 u_short sp, dp; 2846 hostmap_t *hm; 2847 u_32_t flags; 2848 ipnat_t *np; 2849 nat_t *natl; 2850 int move; 2851 2852 move = 1; 2853 hm = NULL; 2854 in.s_addr = 0; 2855 np = ni->nai_np; 2856 flags = nat->nat_flags; 2857 2858 if (flags & IPN_ICMPQUERY) { 2859 dport = fin->fin_data[1]; 2860 sport = 0; 2861 } else { 2862 sport = htons(fin->fin_data[0]); 2863 dport = htons(fin->fin_data[1]); 2864 } 2865 2866 /* TRACE sport, dport */ 2867 2868 2869 /* 2870 * If the matching rule has IPN_STICKY set, then we want to have the 2871 * same rule kick in as before. Why would this happen? If you have 2872 * a collection of rdr rules with "round-robin sticky", the current 2873 * packet might match a different one to the previous connection but 2874 * we want the same destination to be used. 2875 */ 2876 if (((np->in_flags & (IPN_ROUNDR|IPN_SPLIT)) != 0) && 2877 ((np->in_flags & IPN_STICKY) != 0)) { 2878 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, fin->fin_dst, 2879 in, (u_32_t)dport); 2880 if (hm != NULL) { 2881 in.s_addr = ntohl(hm->hm_ndstip.s_addr); 2882 np = hm->hm_ipnat; 2883 ni->nai_np = np; 2884 move = 0; 2885 ipf_nat_hostmapdel(softc, &hm); 2886 } 2887 } 2888 2889 /* 2890 * Otherwise, it's an inbound packet. Most likely, we don't 2891 * want to rewrite source ports and source addresses. Instead, 2892 * we want to rewrite to a fixed internal address and fixed 2893 * internal port. 2894 */ 2895 if (np->in_flags & IPN_SPLIT) { 2896 in.s_addr = np->in_dnip; 2897 inb.s_addr = htonl(in.s_addr); 2898 2899 if ((np->in_flags & (IPN_ROUNDR|IPN_STICKY)) == IPN_STICKY) { 2900 hm = ipf_nat_hostmap(softn, NULL, fin->fin_src, 2901 fin->fin_dst, inb, (u_32_t)dport); 2902 if (hm != NULL) { 2903 in.s_addr = hm->hm_ndstip.s_addr; 2904 move = 0; 2905 } 2906 } 2907 2908 if (hm == NULL || hm->hm_ref == 1) { 2909 if (np->in_ndstaddr == htonl(in.s_addr)) { 2910 np->in_dnip = ntohl(np->in_ndstmsk); 2911 move = 0; 2912 } else { 2913 np->in_dnip = ntohl(np->in_ndstaddr); 2914 } 2915 } 2916 if (hm != NULL) 2917 ipf_nat_hostmapdel(softc, &hm); 2918 2919 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 2920 i6addr_t in6; 2921 2922 /* 2923 * 0/32 - use the interface's IP address. 2924 */ 2925 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, fin->fin_ifp, 2926 &in6, NULL) == -1) { 2927 NBUMPSIDEX(0, ns_new_ifpaddr, ns_new_ifpaddr_2); 2928 return -1; 2929 } 2930 in.s_addr = ntohl(in6.in4.s_addr); 2931 2932 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk== 0)) { 2933 /* 2934 * 0/0 - use the original destination address/port. 2935 */ 2936 in.s_addr = ntohl(fin->fin_daddr); 2937 2938 } else if (np->in_redir == NAT_BIMAP && 2939 np->in_ndstmsk == np->in_odstmsk) { 2940 /* 2941 * map the address block in a 1:1 fashion 2942 */ 2943 in.s_addr = np->in_ndstaddr; 2944 in.s_addr |= fin->fin_daddr & ~np->in_ndstmsk; 2945 in.s_addr = ntohl(in.s_addr); 2946 } else { 2947 in.s_addr = ntohl(np->in_ndstaddr); 2948 } 2949 2950 if ((np->in_dpnext == 0) || ((flags & NAT_NOTRULEPORT) != 0)) 2951 nport = dport; 2952 else { 2953 /* 2954 * Whilst not optimized for the case where 2955 * pmin == pmax, the gain is not significant. 2956 */ 2957 if (((np->in_flags & IPN_FIXEDDPORT) == 0) && 2958 (np->in_odport != np->in_dtop)) { 2959 nport = ntohs(dport) - np->in_odport + np->in_dpmax; 2960 nport = htons(nport); 2961 } else { 2962 nport = htons(np->in_dpnext); 2963 np->in_dpnext++; 2964 if (np->in_dpnext > np->in_dpmax) 2965 np->in_dpnext = np->in_dpmin; 2966 } 2967 } 2968 2969 /* 2970 * When the redirect-to address is set to 0.0.0.0, just 2971 * assume a blank `forwarding' of the packet. We don't 2972 * setup any translation for this either. 2973 */ 2974 if (in.s_addr == 0) { 2975 if (nport == dport) { 2976 NBUMPSIDED(0, ns_xlate_null); 2977 return -1; 2978 } 2979 in.s_addr = ntohl(fin->fin_daddr); 2980 } 2981 2982 /* 2983 * Check to see if this redirect mapping already exists and if 2984 * it does, return "failure" (allowing it to be created will just 2985 * cause one or both of these "connections" to stop working.) 2986 */ 2987 inb.s_addr = htonl(in.s_addr); 2988 sp = fin->fin_data[0]; 2989 dp = fin->fin_data[1]; 2990 fin->fin_data[1] = fin->fin_data[0]; 2991 fin->fin_data[0] = ntohs(nport); 2992 natl = ipf_nat_outlookup(fin, flags & ~(SI_WILDP|NAT_SEARCH), 2993 (u_int)fin->fin_p, inb, fin->fin_src); 2994 fin->fin_data[0] = sp; 2995 fin->fin_data[1] = dp; 2996 if (natl != NULL) { 2997 DT2(ns_new_xlate_exists, fr_info_t *, fin, nat_t *, natl); 2998 NBUMPSIDE(0, ns_xlate_exists); 2999 return -1; 3000 } 3001 3002 nat->nat_ndstaddr = htonl(in.s_addr); 3003 nat->nat_odstip = fin->fin_dst; 3004 nat->nat_nsrcip = fin->fin_src; 3005 nat->nat_osrcip = fin->fin_src; 3006 if ((nat->nat_hm == NULL) && ((np->in_flags & IPN_STICKY) != 0)) 3007 nat->nat_hm = ipf_nat_hostmap(softn, np, fin->fin_src, 3008 fin->fin_dst, inb, (u_32_t)dport); 3009 3010 if (flags & IPN_TCPUDP) { 3011 nat->nat_odport = dport; 3012 nat->nat_ndport = nport; 3013 nat->nat_osport = sport; 3014 nat->nat_nsport = sport; 3015 ((tcphdr_t *)fin->fin_dp)->th_dport = nport; 3016 } else if (flags & IPN_ICMPQUERY) { 3017 nat->nat_oicmpid = fin->fin_data[1]; 3018 ((icmphdr_t *)fin->fin_dp)->icmp_id = nport; 3019 nat->nat_nicmpid = nport; 3020 } 3021 3022 return move; 3023 } 3024 3025 /* ------------------------------------------------------------------------ */ 3026 /* Function: ipf_nat_add */ 3027 /* Returns: nat_t* - NULL == failure to create new NAT structure, */ 3028 /* else pointer to new NAT structure */ 3029 /* Parameters: fin(I) - pointer to packet information */ 3030 /* np(I) - pointer to NAT rule */ 3031 /* natsave(I) - pointer to where to store NAT struct pointer */ 3032 /* flags(I) - flags describing the current packet */ 3033 /* direction(I) - direction of packet (in/out) */ 3034 /* Write Lock: ipf_nat */ 3035 /* */ 3036 /* Attempts to create a new NAT entry. Does not actually change the packet */ 3037 /* in any way. */ 3038 /* */ 3039 /* This function is in three main parts: (1) deal with creating a new NAT */ 3040 /* structure for a "MAP" rule (outgoing NAT translation); (2) deal with */ 3041 /* creating a new NAT structure for a "RDR" rule (incoming NAT translation) */ 3042 /* and (3) building that structure and putting it into the NAT table(s). */ 3043 /* */ 3044 /* NOTE: natsave should NOT be used to point back to an ipstate_t struct */ 3045 /* as it can result in memory being corrupted. */ 3046 /* ------------------------------------------------------------------------ */ 3047 nat_t * 3048 ipf_nat_add(fr_info_t *fin, ipnat_t *np, nat_t **natsave, u_int flags, 3049 int direction) 3050 { 3051 ipf_main_softc_t *softc = fin->fin_main_soft; 3052 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3053 hostmap_t *hm = NULL; 3054 nat_t *nat, *natl; 3055 natstat_t *nsp; 3056 u_int nflags; 3057 natinfo_t ni; 3058 int move; 3059 3060 memset(&ni, 0, sizeof ni); /* XXX gcc */ 3061 nsp = &softn->ipf_nat_stats; 3062 3063 if ((nsp->ns_active * 100 / softn->ipf_nat_table_max) > 3064 softn->ipf_nat_table_wm_high) { 3065 softn->ipf_nat_doflush = 1; 3066 } 3067 3068 if (nsp->ns_active >= softn->ipf_nat_table_max) { 3069 NBUMPSIDED(fin->fin_out, ns_table_max); 3070 return NULL; 3071 } 3072 3073 move = 1; 3074 nflags = np->in_flags & flags; 3075 nflags &= NAT_FROMRULE; 3076 3077 ni.nai_np = np; 3078 ni.nai_dport = 0; 3079 ni.nai_sport = 0; 3080 3081 /* Give me a new nat */ 3082 KMALLOC(nat, nat_t *); 3083 if (nat == NULL) { 3084 NBUMPSIDED(fin->fin_out, ns_memfail); 3085 /* 3086 * Try to automatically tune the max # of entries in the 3087 * table allowed to be less than what will cause kmem_alloc() 3088 * to fail and try to eliminate panics due to out of memory 3089 * conditions arising. 3090 */ 3091 if ((softn->ipf_nat_table_max > softn->ipf_nat_table_sz) && 3092 (nsp->ns_active > 100)) { 3093 softn->ipf_nat_table_max = nsp->ns_active - 100; 3094 printf("table_max reduced to %d\n", 3095 softn->ipf_nat_table_max); 3096 } 3097 return NULL; 3098 } 3099 3100 if (flags & IPN_ICMPQUERY) { 3101 /* 3102 * In the ICMP query NAT code, we translate the ICMP id fields 3103 * to make them unique. This is indepedent of the ICMP type 3104 * (e.g. in the unlikely event that a host sends an echo and 3105 * an tstamp request with the same id, both packets will have 3106 * their ip address/id field changed in the same way). 3107 */ 3108 /* The icmp_id field is used by the sender to identify the 3109 * process making the icmp request. (the receiver justs 3110 * copies it back in its response). So, it closely matches 3111 * the concept of source port. We overlay sport, so we can 3112 * maximally reuse the existing code. 3113 */ 3114 ni.nai_sport = fin->fin_data[1]; 3115 ni.nai_dport = 0; 3116 } 3117 3118 bzero((char *)nat, sizeof(*nat)); 3119 nat->nat_flags = flags; 3120 nat->nat_redir = np->in_redir; 3121 nat->nat_dir = direction; 3122 nat->nat_pr[0] = fin->fin_p; 3123 nat->nat_pr[1] = fin->fin_p; 3124 3125 /* 3126 * Search the current table for a match and create a new mapping 3127 * if there is none found. 3128 */ 3129 if (np->in_redir & NAT_DIVERTUDP) { 3130 move = ipf_nat_newdivert(fin, nat, &ni); 3131 3132 } else if (np->in_redir & NAT_REWRITE) { 3133 move = ipf_nat_newrewrite(fin, nat, &ni); 3134 3135 } else if (direction == NAT_OUTBOUND) { 3136 /* 3137 * We can now arrange to call this for the same connection 3138 * because ipf_nat_new doesn't protect the code path into 3139 * this function. 3140 */ 3141 natl = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 3142 fin->fin_src, fin->fin_dst); 3143 if (natl != NULL) { 3144 KFREE(nat); 3145 nat = natl; 3146 goto done; 3147 } 3148 3149 move = ipf_nat_newmap(fin, nat, &ni); 3150 } else { 3151 /* 3152 * NAT_INBOUND is used for redirects rules 3153 */ 3154 natl = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 3155 fin->fin_src, fin->fin_dst); 3156 if (natl != NULL) { 3157 KFREE(nat); 3158 nat = natl; 3159 goto done; 3160 } 3161 3162 move = ipf_nat_newrdr(fin, nat, &ni); 3163 } 3164 if (move == -1) 3165 goto badnat; 3166 3167 np = ni.nai_np; 3168 3169 nat->nat_mssclamp = np->in_mssclamp; 3170 nat->nat_me = natsave; 3171 nat->nat_fr = fin->fin_fr; 3172 nat->nat_rev = fin->fin_rev; 3173 nat->nat_ptr = np; 3174 nat->nat_dlocal = np->in_dlocal; 3175 3176 if ((np->in_apr != NULL) && ((nat->nat_flags & NAT_SLAVE) == 0)) { 3177 if (ipf_proxy_new(fin, nat) == -1) { 3178 NBUMPSIDED(fin->fin_out, ns_appr_fail); 3179 goto badnat; 3180 } 3181 } 3182 3183 nat->nat_ifps[0] = np->in_ifps[0]; 3184 if (np->in_ifps[0] != NULL) { 3185 COPYIFNAME(np->in_v[0], np->in_ifps[0], nat->nat_ifnames[0]); 3186 } 3187 3188 nat->nat_ifps[1] = np->in_ifps[1]; 3189 if (np->in_ifps[1] != NULL) { 3190 COPYIFNAME(np->in_v[1], np->in_ifps[1], nat->nat_ifnames[1]); 3191 } 3192 3193 if (ipf_nat_finalise(fin, nat) == -1) { 3194 goto badnat; 3195 } 3196 3197 np->in_use++; 3198 3199 if ((move == 1) && (np->in_flags & IPN_ROUNDR)) { 3200 if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_REDIRECT) { 3201 ipf_nat_delrdr(softn, np); 3202 ipf_nat_addrdr(softn, np); 3203 } else if ((np->in_redir & (NAT_REDIRECT|NAT_MAP)) == NAT_MAP) { 3204 ipf_nat_delmap(softn, np); 3205 ipf_nat_addmap(softn, np); 3206 } 3207 } 3208 3209 if (flags & SI_WILDP) 3210 nsp->ns_wilds++; 3211 nsp->ns_proto[nat->nat_pr[0]]++; 3212 3213 goto done; 3214 badnat: 3215 DT2(ns_badnatnew, fr_info_t *, fin, nat_t *, nat); 3216 NBUMPSIDE(fin->fin_out, ns_badnatnew); 3217 if ((hm = nat->nat_hm) != NULL) 3218 ipf_nat_hostmapdel(softc, &hm); 3219 KFREE(nat); 3220 nat = NULL; 3221 done: 3222 if (nat != NULL && np != NULL) 3223 np->in_hits++; 3224 if (natsave != NULL) 3225 *natsave = nat; 3226 return nat; 3227 } 3228 3229 3230 /* ------------------------------------------------------------------------ */ 3231 /* Function: ipf_nat_finalise */ 3232 /* Returns: int - 0 == sucess, -1 == failure */ 3233 /* Parameters: fin(I) - pointer to packet information */ 3234 /* nat(I) - pointer to NAT entry */ 3235 /* Write Lock: ipf_nat */ 3236 /* */ 3237 /* This is the tail end of constructing a new NAT entry and is the same */ 3238 /* for both IPv4 and IPv6. */ 3239 /* ------------------------------------------------------------------------ */ 3240 /*ARGSUSED*/ 3241 static int 3242 ipf_nat_finalise(fr_info_t *fin, nat_t *nat) 3243 { 3244 ipf_main_softc_t *softc = fin->fin_main_soft; 3245 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3246 u_32_t sum1, sum2, sumd; 3247 frentry_t *fr; 3248 #if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_M_CTL_MAGIC) 3249 qpktinfo_t *qpi = fin->fin_qpi; 3250 #endif 3251 3252 switch (nat->nat_pr[0]) 3253 { 3254 case IPPROTO_ICMP : 3255 sum1 = LONG_SUM(ntohs(nat->nat_oicmpid)); 3256 sum2 = LONG_SUM(ntohs(nat->nat_nicmpid)); 3257 CALC_SUMD(sum1, sum2, sumd); 3258 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3259 3260 break; 3261 3262 default : 3263 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr) + \ 3264 ntohs(nat->nat_osport)); 3265 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr) + \ 3266 ntohs(nat->nat_nsport)); 3267 CALC_SUMD(sum1, sum2, sumd); 3268 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 3269 3270 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr) + \ 3271 ntohs(nat->nat_odport)); 3272 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr) + \ 3273 ntohs(nat->nat_ndport)); 3274 CALC_SUMD(sum1, sum2, sumd); 3275 nat->nat_sumd[0] += (sumd & 0xffff) + (sumd >> 16); 3276 break; 3277 } 3278 3279 /* 3280 * Compute the partial checksum, just in case. 3281 * This is only ever placed into outbound packets so care needs 3282 * to be taken over which pair of addresses are used. 3283 */ 3284 if (nat->nat_dir == NAT_OUTBOUND) { 3285 sum1 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3286 sum1 += LONG_SUM(ntohl(nat->nat_ndstaddr)); 3287 } else { 3288 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3289 sum1 += LONG_SUM(ntohl(nat->nat_odstaddr)); 3290 } 3291 sum1 += nat->nat_pr[1]; 3292 nat->nat_sumd[1] = (sum1 & 0xffff) + (sum1 >> 16); 3293 3294 sum1 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 3295 sum2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 3296 CALC_SUMD(sum1, sum2, sumd); 3297 nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16); 3298 3299 sum1 = LONG_SUM(ntohl(nat->nat_odstaddr)); 3300 sum2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 3301 CALC_SUMD(sum1, sum2, sumd); 3302 nat->nat_ipsumd += (sumd & 0xffff) + (sumd >> 16); 3303 3304 nat->nat_v[0] = 4; 3305 nat->nat_v[1] = 4; 3306 3307 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3308 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3309 } 3310 3311 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3312 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3313 } 3314 3315 if ((nat->nat_flags & SI_CLONE) == 0) 3316 nat->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, nat); 3317 3318 if (ipf_nat_insert(softc, softn, nat) == 0) { 3319 if (softn->ipf_nat_logging) 3320 ipf_nat_log(softc, softn, nat, NL_NEW); 3321 fr = nat->nat_fr; 3322 if (fr != NULL) { 3323 MUTEX_ENTER(&fr->fr_lock); 3324 fr->fr_ref++; 3325 MUTEX_EXIT(&fr->fr_lock); 3326 } 3327 return 0; 3328 } 3329 3330 NBUMPSIDED(fin->fin_out, ns_unfinalised); 3331 /* 3332 * nat_insert failed, so cleanup time... 3333 */ 3334 if (nat->nat_sync != NULL) 3335 ipf_sync_del_nat(softc->ipf_sync_soft, nat->nat_sync); 3336 return -1; 3337 } 3338 3339 3340 /* ------------------------------------------------------------------------ */ 3341 /* Function: ipf_nat_insert */ 3342 /* Returns: int - 0 == sucess, -1 == failure */ 3343 /* Parameters: softc(I) - pointer to soft context main structure */ 3344 /* softn(I) - pointer to NAT context structure */ 3345 /* nat(I) - pointer to NAT structure */ 3346 /* Write Lock: ipf_nat */ 3347 /* */ 3348 /* Insert a NAT entry into the hash tables for searching and add it to the */ 3349 /* list of active NAT entries. Adjust global counters when complete. */ 3350 /* ------------------------------------------------------------------------ */ 3351 int 3352 ipf_nat_insert(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 3353 { 3354 u_int hv0, hv1; 3355 u_int sp, dp; 3356 ipnat_t *in; 3357 int ret; 3358 3359 /* 3360 * Try and return an error as early as possible, so calculate the hash 3361 * entry numbers first and then proceed. 3362 */ 3363 if ((nat->nat_flags & (SI_W_SPORT|SI_W_DPORT)) == 0) { 3364 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3365 sp = nat->nat_osport; 3366 dp = nat->nat_odport; 3367 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3368 sp = 0; 3369 dp = nat->nat_oicmpid; 3370 } else { 3371 sp = 0; 3372 dp = 0; 3373 } 3374 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, sp, 0xffffffff); 3375 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0 + dp, 0xffffffff); 3376 /* 3377 * TRACE nat_osrcaddr, nat_osport, nat_odstaddr, 3378 * nat_odport, hv0 3379 */ 3380 3381 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 3382 sp = nat->nat_nsport; 3383 dp = nat->nat_ndport; 3384 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 3385 sp = 0; 3386 dp = nat->nat_nicmpid; 3387 } else { 3388 sp = 0; 3389 dp = 0; 3390 } 3391 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, sp, 0xffffffff); 3392 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1 + dp, 0xffffffff); 3393 /* 3394 * TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, 3395 * nat_ndport, hv1 3396 */ 3397 } else { 3398 hv0 = NAT_HASH_FN(nat->nat_osrcaddr, 0, 0xffffffff); 3399 hv0 = NAT_HASH_FN(nat->nat_odstaddr, hv0, 0xffffffff); 3400 /* TRACE nat_osrcaddr, nat_odstaddr, hv0 */ 3401 3402 hv1 = NAT_HASH_FN(nat->nat_nsrcaddr, 0, 0xffffffff); 3403 hv1 = NAT_HASH_FN(nat->nat_ndstaddr, hv1, 0xffffffff); 3404 /* TRACE nat_nsrcaddr, nat_ndstaddr, hv1 */ 3405 } 3406 3407 if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { 3408 nat->nat_hv[0] = hv0; 3409 nat->nat_hv[1] = hv1; 3410 } else { 3411 nat->nat_hv[0] = hv1; 3412 nat->nat_hv[1] = hv0; 3413 } 3414 3415 MUTEX_INIT(&nat->nat_lock, "nat entry lock"); 3416 3417 in = nat->nat_ptr; 3418 nat->nat_ref = nat->nat_me ? 2 : 1; 3419 3420 nat->nat_ifnames[0][LIFNAMSIZ - 1] = '\0'; 3421 nat->nat_ifps[0] = ipf_resolvenic(softc, nat->nat_ifnames[0], 4); 3422 3423 if (nat->nat_ifnames[1][0] != '\0') { 3424 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3425 nat->nat_ifps[1] = ipf_resolvenic(softc, 3426 nat->nat_ifnames[1], 4); 3427 } else if (in->in_ifnames[1] != -1) { 3428 char *name; 3429 3430 name = in->in_names + in->in_ifnames[1]; 3431 if (name[1] != '\0' && name[0] != '-' && name[0] != '*') { 3432 (void) strncpy(nat->nat_ifnames[1], 3433 nat->nat_ifnames[0], LIFNAMSIZ); 3434 nat->nat_ifnames[1][LIFNAMSIZ - 1] = '\0'; 3435 nat->nat_ifps[1] = nat->nat_ifps[0]; 3436 } 3437 } 3438 if ((nat->nat_ifps[0] != NULL) && (nat->nat_ifps[0] != (void *)-1)) { 3439 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 3440 } 3441 if ((nat->nat_ifps[1] != NULL) && (nat->nat_ifps[1] != (void *)-1)) { 3442 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 3443 } 3444 3445 ret = ipf_nat_hashtab_add(softc, softn, nat); 3446 if (ret != 0) 3447 MUTEX_DESTROY(&nat->nat_lock); 3448 return ret; 3449 } 3450 3451 3452 /* ------------------------------------------------------------------------ */ 3453 /* Function: ipf_nat_hashtab_add */ 3454 /* Returns: int - 0 == sucess, -1 == failure */ 3455 /* Parameters: softc(I) - pointer to soft context main structure */ 3456 /* softn(I) - pointer to NAT context structure */ 3457 /* nat(I) - pointer to NAT structure */ 3458 /* Write Lock: ipf_nat */ 3459 /* */ 3460 /* Handle the insertion of a NAT entry into the table/list. */ 3461 /* ------------------------------------------------------------------------ */ 3462 int 3463 ipf_nat_hashtab_add(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 3464 { 3465 nat_t **natp; 3466 u_int hv0; 3467 u_int hv1; 3468 3469 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 3470 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 3471 3472 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0] >= 3473 softn->ipf_nat_maxbucket) { 3474 DT1(ns_bucket_max_0, int, 3475 softn->ipf_nat_stats.ns_side[0].ns_bucketlen[hv0]); 3476 NBUMPSIDE(0, ns_bucket_max); 3477 return -1; 3478 } 3479 3480 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1] >= 3481 softn->ipf_nat_maxbucket) { 3482 DT1(ns_bucket_max_1, int, 3483 softn->ipf_nat_stats.ns_side[1].ns_bucketlen[hv1]); 3484 NBUMPSIDE(1, ns_bucket_max); 3485 return -1; 3486 } 3487 3488 /* 3489 * The ordering of operations in the list and hash table insertion 3490 * is very important. The last operation for each task should be 3491 * to update the top of the list, after all the "nexts" have been 3492 * done so that walking the list while it is being done does not 3493 * find strange pointers. 3494 * 3495 * Global list of NAT instances 3496 */ 3497 nat->nat_next = softn->ipf_nat_instances; 3498 nat->nat_pnext = &softn->ipf_nat_instances; 3499 if (softn->ipf_nat_instances) 3500 softn->ipf_nat_instances->nat_pnext = &nat->nat_next; 3501 softn->ipf_nat_instances = nat; 3502 3503 /* 3504 * Inbound hash table. 3505 */ 3506 natp = &softn->ipf_nat_table[0][hv0]; 3507 nat->nat_phnext[0] = natp; 3508 nat->nat_hnext[0] = *natp; 3509 if (*natp) { 3510 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 3511 } else { 3512 NBUMPSIDE(0, ns_inuse); 3513 } 3514 *natp = nat; 3515 NBUMPSIDE(0, ns_bucketlen[hv0]); 3516 3517 /* 3518 * Outbound hash table. 3519 */ 3520 natp = &softn->ipf_nat_table[1][hv1]; 3521 nat->nat_phnext[1] = natp; 3522 nat->nat_hnext[1] = *natp; 3523 if (*natp) 3524 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 3525 else { 3526 NBUMPSIDE(1, ns_inuse); 3527 } 3528 *natp = nat; 3529 NBUMPSIDE(1, ns_bucketlen[hv1]); 3530 3531 ipf_nat_setqueue(softc, softn, nat); 3532 3533 if (nat->nat_dir & NAT_OUTBOUND) { 3534 NBUMPSIDE(1, ns_added); 3535 } else { 3536 NBUMPSIDE(0, ns_added); 3537 } 3538 softn->ipf_nat_stats.ns_active++; 3539 return 0; 3540 } 3541 3542 3543 /* ------------------------------------------------------------------------ */ 3544 /* Function: ipf_nat_icmperrorlookup */ 3545 /* Returns: nat_t* - point to matching NAT structure */ 3546 /* Parameters: fin(I) - pointer to packet information */ 3547 /* dir(I) - direction of packet (in/out) */ 3548 /* */ 3549 /* Check if the ICMP error message is related to an existing TCP, UDP or */ 3550 /* ICMP query nat entry. It is assumed that the packet is already of the */ 3551 /* the required length. */ 3552 /* ------------------------------------------------------------------------ */ 3553 nat_t * 3554 ipf_nat_icmperrorlookup(fr_info_t *fin, int dir) 3555 { 3556 ipf_main_softc_t *softc = fin->fin_main_soft; 3557 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3558 int flags = 0, minlen; 3559 icmphdr_t *orgicmp; 3560 nat_stat_side_t *nside; 3561 tcphdr_t *tcp = NULL; 3562 u_short data[2]; 3563 nat_t *nat; 3564 ip_t *oip; 3565 u_int p; 3566 3567 nside = &softn->ipf_nat_stats.ns_side[fin->fin_out]; 3568 /* 3569 * Does it at least have the return (basic) IP header ? 3570 * Only a basic IP header (no options) should be with an ICMP error 3571 * header. Also, if it's not an error type, then return. 3572 */ 3573 if ((fin->fin_hlen != sizeof(ip_t)) || !(fin->fin_flx & FI_ICMPERR)) { 3574 ATOMIC_INCL(nside->ns_icmp_basic); 3575 return NULL; 3576 } 3577 3578 /* 3579 * Check packet size 3580 */ 3581 oip = (ip_t *)((char *)fin->fin_dp + 8); 3582 minlen = IP_HL(oip) << 2; 3583 if ((minlen < sizeof(ip_t)) || 3584 (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen)) { 3585 ATOMIC_INCL(nside->ns_icmp_size); 3586 return NULL; 3587 } 3588 3589 /* 3590 * Is the buffer big enough for all of it ? It's the size of the IP 3591 * header claimed in the encapsulated part which is of concern. It 3592 * may be too big to be in this buffer but not so big that it's 3593 * outside the ICMP packet, leading to TCP deref's causing problems. 3594 * This is possible because we don't know how big oip_hl is when we 3595 * do the pullup early in ipf_check() and thus can't gaurantee it is 3596 * all here now. 3597 */ 3598 #ifdef ipf_nat_KERNEL 3599 { 3600 mb_t *m; 3601 3602 m = fin->fin_m; 3603 # if defined(MENTAT) 3604 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3605 (char *)m->b_wptr) { 3606 ATOMIC_INCL(nside->ns_icmp_mbuf); 3607 return NULL; 3608 } 3609 # else 3610 if ((char *)oip + fin->fin_dlen - ICMPERR_ICMPHLEN > 3611 (char *)fin->fin_ip + M_LEN(m)) { 3612 ATOMIC_INCL(nside->ns_icmp_mbuf); 3613 return NULL; 3614 } 3615 # endif 3616 } 3617 #endif 3618 3619 if (fin->fin_daddr != oip->ip_src.s_addr) { 3620 ATOMIC_INCL(nside->ns_icmp_address); 3621 return NULL; 3622 } 3623 3624 p = oip->ip_p; 3625 if (p == IPPROTO_TCP) 3626 flags = IPN_TCP; 3627 else if (p == IPPROTO_UDP) 3628 flags = IPN_UDP; 3629 else if (p == IPPROTO_ICMP) { 3630 orgicmp = (icmphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3631 3632 /* see if this is related to an ICMP query */ 3633 if (ipf_nat_icmpquerytype(orgicmp->icmp_type)) { 3634 data[0] = fin->fin_data[0]; 3635 data[1] = fin->fin_data[1]; 3636 fin->fin_data[0] = 0; 3637 fin->fin_data[1] = orgicmp->icmp_id; 3638 3639 flags = IPN_ICMPERR|IPN_ICMPQUERY; 3640 /* 3641 * NOTE : dir refers to the direction of the original 3642 * ip packet. By definition the icmp error 3643 * message flows in the opposite direction. 3644 */ 3645 if (dir == NAT_INBOUND) 3646 nat = ipf_nat_inlookup(fin, flags, p, 3647 oip->ip_dst, 3648 oip->ip_src); 3649 else 3650 nat = ipf_nat_outlookup(fin, flags, p, 3651 oip->ip_dst, 3652 oip->ip_src); 3653 fin->fin_data[0] = data[0]; 3654 fin->fin_data[1] = data[1]; 3655 return nat; 3656 } 3657 } 3658 3659 if (flags & IPN_TCPUDP) { 3660 minlen += 8; /* + 64bits of data to get ports */ 3661 /* TRACE (fin,minlen) */ 3662 if (fin->fin_plen < ICMPERR_IPICMPHLEN + minlen) { 3663 ATOMIC_INCL(nside->ns_icmp_short); 3664 return NULL; 3665 } 3666 3667 data[0] = fin->fin_data[0]; 3668 data[1] = fin->fin_data[1]; 3669 tcp = (tcphdr_t *)((char *)oip + (IP_HL(oip) << 2)); 3670 fin->fin_data[0] = ntohs(tcp->th_dport); 3671 fin->fin_data[1] = ntohs(tcp->th_sport); 3672 3673 if (dir == NAT_INBOUND) { 3674 nat = ipf_nat_inlookup(fin, flags, p, oip->ip_dst, 3675 oip->ip_src); 3676 } else { 3677 nat = ipf_nat_outlookup(fin, flags, p, oip->ip_dst, 3678 oip->ip_src); 3679 } 3680 fin->fin_data[0] = data[0]; 3681 fin->fin_data[1] = data[1]; 3682 return nat; 3683 } 3684 if (dir == NAT_INBOUND) 3685 nat = ipf_nat_inlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3686 else 3687 nat = ipf_nat_outlookup(fin, 0, p, oip->ip_dst, oip->ip_src); 3688 3689 return nat; 3690 } 3691 3692 3693 /* ------------------------------------------------------------------------ */ 3694 /* Function: ipf_nat_icmperror */ 3695 /* Returns: nat_t* - point to matching NAT structure */ 3696 /* Parameters: fin(I) - pointer to packet information */ 3697 /* nflags(I) - NAT flags for this packet */ 3698 /* dir(I) - direction of packet (in/out) */ 3699 /* */ 3700 /* Fix up an ICMP packet which is an error message for an existing NAT */ 3701 /* session. This will correct both packet header data and checksums. */ 3702 /* */ 3703 /* This should *ONLY* be used for incoming ICMP error packets to make sure */ 3704 /* a NAT'd ICMP packet gets correctly recognised. */ 3705 /* ------------------------------------------------------------------------ */ 3706 nat_t * 3707 ipf_nat_icmperror(fr_info_t *fin, u_int *nflags, int dir) 3708 { 3709 ipf_main_softc_t *softc = fin->fin_main_soft; 3710 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 3711 u_32_t sum1, sum2, sumd, sumd2; 3712 struct in_addr a1, a2, a3, a4; 3713 int flags, dlen, odst; 3714 icmphdr_t *icmp; 3715 u_short *csump; 3716 tcphdr_t *tcp; 3717 nat_t *nat; 3718 ip_t *oip; 3719 void *dp; 3720 3721 if ((fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 3722 NBUMPSIDED(fin->fin_out, ns_icmp_short); 3723 return NULL; 3724 } 3725 3726 /* 3727 * ipf_nat_icmperrorlookup() will return NULL for `defective' packets. 3728 */ 3729 if ((fin->fin_v != 4) || !(nat = ipf_nat_icmperrorlookup(fin, dir))) { 3730 NBUMPSIDED(fin->fin_out, ns_icmp_notfound); 3731 return NULL; 3732 } 3733 3734 tcp = NULL; 3735 csump = NULL; 3736 flags = 0; 3737 sumd2 = 0; 3738 *nflags = IPN_ICMPERR; 3739 icmp = fin->fin_dp; 3740 oip = (ip_t *)&icmp->icmp_ip; 3741 dp = (((char *)oip) + (IP_HL(oip) << 2)); 3742 if (oip->ip_p == IPPROTO_TCP) { 3743 tcp = (tcphdr_t *)dp; 3744 csump = (u_short *)&tcp->th_sum; 3745 flags = IPN_TCP; 3746 } else if (oip->ip_p == IPPROTO_UDP) { 3747 udphdr_t *udp; 3748 3749 udp = (udphdr_t *)dp; 3750 tcp = (tcphdr_t *)dp; 3751 csump = (u_short *)&udp->uh_sum; 3752 flags = IPN_UDP; 3753 } else if (oip->ip_p == IPPROTO_ICMP) 3754 flags = IPN_ICMPQUERY; 3755 dlen = fin->fin_plen - ((char *)dp - (char *)fin->fin_ip); 3756 3757 /* 3758 * Need to adjust ICMP header to include the real IP#'s and 3759 * port #'s. Only apply a checksum change relative to the 3760 * IP address change as it will be modified again in ipf_nat_checkout 3761 * for both address and port. Two checksum changes are 3762 * necessary for the two header address changes. Be careful 3763 * to only modify the checksum once for the port # and twice 3764 * for the IP#. 3765 */ 3766 3767 /* 3768 * Step 1 3769 * Fix the IP addresses in the offending IP packet. You also need 3770 * to adjust the IP header checksum of that offending IP packet. 3771 * 3772 * Normally, you would expect that the ICMP checksum of the 3773 * ICMP error message needs to be adjusted as well for the 3774 * IP address change in oip. 3775 * However, this is a NOP, because the ICMP checksum is 3776 * calculated over the complete ICMP packet, which includes the 3777 * changed oip IP addresses and oip->ip_sum. However, these 3778 * two changes cancel each other out (if the delta for 3779 * the IP address is x, then the delta for ip_sum is minus x), 3780 * so no change in the icmp_cksum is necessary. 3781 * 3782 * Inbound ICMP 3783 * ------------ 3784 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3785 * - response to outgoing packet (a,b)=>(c,b) (OIP_SRC=c,OIP_DST=b) 3786 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(b)=nat_newdstip 3787 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(b)=nat_olddstip 3788 * 3789 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3790 * - response to outgoing packet (c,a)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3791 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3792 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3793 * 3794 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3795 * - response to outgoing packet (a,b)=>(c,d) (OIP_SRC=c,OIP_DST=d) 3796 * - OIP_SRC(c)=nat_newsrcip, OIP_DST(d)=nat_newdstip 3797 *=> OIP_SRC(c)=nat_oldsrcip, OIP_DST(d)=nat_olddstip 3798 * 3799 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3800 * - response to outgoing packet (d,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3801 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3802 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3803 * 3804 * Outbound ICMP 3805 * ------------- 3806 * MAP rule, SRC=a,DST=b -> SRC=c,DST=b 3807 * - response to incoming packet (b,c)=>(b,a) (OIP_SRC=b,OIP_DST=a) 3808 * - OIP_SRC(b)=nat_olddstip, OIP_DST(a)=nat_oldsrcip 3809 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3810 * 3811 * RDR rule, SRC=a,DST=b -> SRC=a,DST=c 3812 * - response to incoming packet (a,b)=>(a,c) (OIP_SRC=a,OIP_DST=c) 3813 * - OIP_SRC(a)=nat_newsrcip, OIP_DST(c)=nat_newdstip 3814 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3815 * 3816 * REWRITE out rule, SRC=a,DST=b -> SRC=c,DST=d 3817 * - response to incoming packet (d,c)=>(b,a) (OIP_SRC=c,OIP_DST=d) 3818 * - OIP_SRC(c)=nat_olddstip, OIP_DST(d)=nat_oldsrcip 3819 *=> OIP_SRC(b)=nat_newdstip, OIP_DST(a)=nat_newsrcip 3820 * 3821 * REWRITE in rule, SRC=a,DST=b -> SRC=c,DST=d 3822 * - response to incoming packet (a,b)=>(c,d) (OIP_SRC=b,OIP_DST=a) 3823 * - OIP_SRC(b)=nat_newsrcip, OIP_DST(a)=nat_newdstip 3824 *=> OIP_SRC(a)=nat_oldsrcip, OIP_DST(c)=nat_olddstip 3825 */ 3826 3827 if (((fin->fin_out == 0) && ((nat->nat_redir & NAT_MAP) != 0)) || 3828 ((fin->fin_out == 1) && ((nat->nat_redir & NAT_REDIRECT) != 0))) { 3829 a1.s_addr = ntohl(nat->nat_osrcaddr); 3830 a4.s_addr = ntohl(oip->ip_src.s_addr); 3831 a3.s_addr = ntohl(nat->nat_odstaddr); 3832 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3833 oip->ip_src.s_addr = htonl(a1.s_addr); 3834 oip->ip_dst.s_addr = htonl(a3.s_addr); 3835 odst = 1; 3836 } else { 3837 a1.s_addr = ntohl(nat->nat_ndstaddr); 3838 a2.s_addr = ntohl(oip->ip_dst.s_addr); 3839 a3.s_addr = ntohl(nat->nat_nsrcaddr); 3840 a4.s_addr = ntohl(oip->ip_src.s_addr); 3841 oip->ip_dst.s_addr = htonl(a3.s_addr); 3842 oip->ip_src.s_addr = htonl(a1.s_addr); 3843 odst = 0; 3844 } 3845 sum1 = 0; 3846 sum2 = 0; 3847 sumd = 0; 3848 CALC_SUMD(a2.s_addr, a3.s_addr, sum1); 3849 CALC_SUMD(a4.s_addr, a1.s_addr, sum2); 3850 sumd = sum2 + sum1; 3851 if (sumd != 0) 3852 ipf_fix_datacksum(&oip->ip_sum, sumd); 3853 3854 sumd2 = sumd; 3855 sum1 = 0; 3856 sum2 = 0; 3857 3858 /* 3859 * Fix UDP pseudo header checksum to compensate for the 3860 * IP address change. 3861 */ 3862 if (((flags & IPN_TCPUDP) != 0) && (dlen >= 4)) { 3863 u_32_t sum3, sum4, sumt; 3864 3865 /* 3866 * Step 2 : 3867 * For offending TCP/UDP IP packets, translate the ports as 3868 * well, based on the NAT specification. Of course such 3869 * a change may be reflected in the ICMP checksum as well. 3870 * 3871 * Since the port fields are part of the TCP/UDP checksum 3872 * of the offending IP packet, you need to adjust that checksum 3873 * as well... except that the change in the port numbers should 3874 * be offset by the checksum change. However, the TCP/UDP 3875 * checksum will also need to change if there has been an 3876 * IP address change. 3877 */ 3878 if (odst == 1) { 3879 sum1 = ntohs(nat->nat_osport); 3880 sum4 = ntohs(tcp->th_sport); 3881 sum3 = ntohs(nat->nat_odport); 3882 sum2 = ntohs(tcp->th_dport); 3883 3884 tcp->th_sport = htons(sum1); 3885 tcp->th_dport = htons(sum3); 3886 } else { 3887 sum1 = ntohs(nat->nat_ndport); 3888 sum2 = ntohs(tcp->th_dport); 3889 sum3 = ntohs(nat->nat_nsport); 3890 sum4 = ntohs(tcp->th_sport); 3891 3892 tcp->th_dport = htons(sum3); 3893 tcp->th_sport = htons(sum1); 3894 } 3895 CALC_SUMD(sum4, sum1, sumt); 3896 sumd += sumt; 3897 CALC_SUMD(sum2, sum3, sumt); 3898 sumd += sumt; 3899 3900 if (sumd != 0 || sumd2 != 0) { 3901 /* 3902 * At this point, sumd is the delta to apply to the 3903 * TCP/UDP header, given the changes in both the IP 3904 * address and the ports and sumd2 is the delta to 3905 * apply to the ICMP header, given the IP address 3906 * change delta that may need to be applied to the 3907 * TCP/UDP checksum instead. 3908 * 3909 * If we will both the IP and TCP/UDP checksums 3910 * then the ICMP checksum changes by the address 3911 * delta applied to the TCP/UDP checksum. If we 3912 * do not change the TCP/UDP checksum them we 3913 * apply the delta in ports to the ICMP checksum. 3914 */ 3915 if (oip->ip_p == IPPROTO_UDP) { 3916 if ((dlen >= 8) && (*csump != 0)) { 3917 ipf_fix_datacksum(csump, sumd); 3918 } else { 3919 CALC_SUMD(sum1, sum4, sumd2); 3920 CALC_SUMD(sum3, sum2, sumt); 3921 sumd2 += sumt; 3922 } 3923 } else if (oip->ip_p == IPPROTO_TCP) { 3924 if (dlen >= 18) { 3925 ipf_fix_datacksum(csump, sumd); 3926 } else { 3927 CALC_SUMD(sum1, sum4, sumd2); 3928 CALC_SUMD(sum3, sum2, sumt); 3929 sumd2 += sumt; 3930 } 3931 } 3932 if (sumd2 != 0) { 3933 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3934 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3935 sumd2 = (sumd2 & 0xffff) + (sumd2 >> 16); 3936 ipf_fix_incksum(0, &icmp->icmp_cksum, sumd2, 0); 3937 } 3938 } 3939 } else if (((flags & IPN_ICMPQUERY) != 0) && (dlen >= 8)) { 3940 icmphdr_t *orgicmp; 3941 3942 /* 3943 * XXX - what if this is bogus hl and we go off the end ? 3944 * In this case, ipf_nat_icmperrorlookup() will have 3945 * returned NULL. 3946 */ 3947 orgicmp = (icmphdr_t *)dp; 3948 3949 if (odst == 1) { 3950 if (orgicmp->icmp_id != nat->nat_osport) { 3951 3952 /* 3953 * Fix ICMP checksum (of the offening ICMP 3954 * query packet) to compensate the change 3955 * in the ICMP id of the offending ICMP 3956 * packet. 3957 * 3958 * Since you modify orgicmp->icmp_id with 3959 * a delta (say x) and you compensate that 3960 * in origicmp->icmp_cksum with a delta 3961 * minus x, you don't have to adjust the 3962 * overall icmp->icmp_cksum 3963 */ 3964 sum1 = ntohs(orgicmp->icmp_id); 3965 sum2 = ntohs(nat->nat_oicmpid); 3966 CALC_SUMD(sum1, sum2, sumd); 3967 orgicmp->icmp_id = nat->nat_oicmpid; 3968 ipf_fix_datacksum(&orgicmp->icmp_cksum, sumd); 3969 } 3970 } /* nat_dir == NAT_INBOUND is impossible for icmp queries */ 3971 } 3972 return nat; 3973 } 3974 3975 3976 /* 3977 * MAP-IN MAP-OUT RDR-IN RDR-OUT 3978 * osrc X == src == src X 3979 * odst X == dst == dst X 3980 * nsrc == dst X X == dst 3981 * ndst == src X X == src 3982 * MAP = NAT_OUTBOUND, RDR = NAT_INBOUND 3983 */ 3984 /* 3985 * NB: these lookups don't lock access to the list, it assumed that it has 3986 * already been done! 3987 */ 3988 /* ------------------------------------------------------------------------ */ 3989 /* Function: ipf_nat_inlookup */ 3990 /* Returns: nat_t* - NULL == no match, */ 3991 /* else pointer to matching NAT entry */ 3992 /* Parameters: fin(I) - pointer to packet information */ 3993 /* flags(I) - NAT flags for this packet */ 3994 /* p(I) - protocol for this packet */ 3995 /* src(I) - source IP address */ 3996 /* mapdst(I) - destination IP address */ 3997 /* */ 3998 /* Lookup a nat entry based on the mapped destination ip address/port and */ 3999 /* real source address/port. We use this lookup when receiving a packet, */ 4000 /* we're looking for a table entry, based on the destination address. */ 4001 /* */ 4002 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4003 /* */ 4004 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4005 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4006 /* */ 4007 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4008 /* the packet is of said protocol */ 4009 /* ------------------------------------------------------------------------ */ 4010 nat_t * 4011 ipf_nat_inlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, 4012 struct in_addr mapdst) 4013 { 4014 ipf_main_softc_t *softc = fin->fin_main_soft; 4015 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4016 u_short sport, dport; 4017 ipnat_t *ipn; 4018 nat_t *nat; 4019 int nflags; 4020 u_32_t dst; 4021 void *ifp; 4022 u_int hv, rhv; 4023 4024 ifp = fin->fin_ifp; 4025 dst = mapdst.s_addr; 4026 4027 switch (p) 4028 { 4029 case IPPROTO_TCP : 4030 case IPPROTO_UDP : 4031 sport = htons(fin->fin_data[0]); 4032 dport = htons(fin->fin_data[1]); 4033 break; 4034 case IPPROTO_ICMP : 4035 sport = 0; 4036 dport = fin->fin_data[1]; 4037 break; 4038 default : 4039 sport = 0; 4040 dport = 0; 4041 break; 4042 } 4043 4044 4045 if ((flags & SI_WILDP) != 0) 4046 goto find_in_wild_ports; 4047 4048 rhv = NAT_HASH_FN(dst, dport, 0xffffffff); 4049 rhv = NAT_HASH_FN(src.s_addr, rhv + sport, 0xffffffff); 4050 hv = rhv % softn->ipf_nat_table_sz; 4051 nat = softn->ipf_nat_table[1][hv]; 4052 /* TRACE dst, dport, src, sport, hv, nat */ 4053 4054 for (; nat; nat = nat->nat_hnext[1]) { 4055 if (nat->nat_ifps[0] != NULL) { 4056 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4057 continue; 4058 } 4059 4060 if (nat->nat_pr[0] != p) 4061 continue; 4062 4063 switch (nat->nat_dir) 4064 { 4065 case NAT_INBOUND : 4066 case NAT_DIVERTIN : 4067 if (nat->nat_v[0] != 4) 4068 continue; 4069 if (nat->nat_osrcaddr != src.s_addr || 4070 nat->nat_odstaddr != dst) 4071 continue; 4072 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4073 if (nat->nat_osport != sport) 4074 continue; 4075 if (nat->nat_odport != dport) 4076 continue; 4077 4078 } else if (p == IPPROTO_ICMP) { 4079 if (nat->nat_oicmpid != dport) { 4080 continue; 4081 } 4082 } 4083 break; 4084 case NAT_DIVERTOUT : 4085 if (nat->nat_dlocal) 4086 continue; 4087 case NAT_OUTBOUND : 4088 if (nat->nat_v[1] != 4) 4089 continue; 4090 if (nat->nat_dlocal) 4091 continue; 4092 if (nat->nat_dlocal) 4093 continue; 4094 if (nat->nat_ndstaddr != src.s_addr || 4095 nat->nat_nsrcaddr != dst) 4096 continue; 4097 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4098 if (nat->nat_ndport != sport) 4099 continue; 4100 if (nat->nat_nsport != dport) 4101 continue; 4102 4103 } else if (p == IPPROTO_ICMP) { 4104 if (nat->nat_nicmpid != dport) { 4105 continue; 4106 } 4107 } 4108 break; 4109 } 4110 4111 4112 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4113 ipn = nat->nat_ptr; 4114 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4115 if (ipf_proxy_match(fin, nat) != 0) 4116 continue; 4117 } 4118 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4119 nat->nat_ifps[0] = ifp; 4120 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4121 } 4122 return nat; 4123 } 4124 4125 /* 4126 * So if we didn't find it but there are wildcard members in the hash 4127 * table, go back and look for them. We do this search and update here 4128 * because it is modifying the NAT table and we want to do this only 4129 * for the first packet that matches. The exception, of course, is 4130 * for "dummy" (FI_IGNORE) lookups. 4131 */ 4132 find_in_wild_ports: 4133 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4134 NBUMPSIDEX(0, ns_lookup_miss, ns_lookup_miss_0); 4135 return NULL; 4136 } 4137 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4138 NBUMPSIDEX(0, ns_lookup_nowild, ns_lookup_nowild_0); 4139 return NULL; 4140 } 4141 4142 RWLOCK_EXIT(&softc->ipf_nat); 4143 4144 hv = NAT_HASH_FN(dst, 0, 0xffffffff); 4145 hv = NAT_HASH_FN(src.s_addr, hv, softn->ipf_nat_table_sz); 4146 WRITE_ENTER(&softc->ipf_nat); 4147 4148 nat = softn->ipf_nat_table[1][hv]; 4149 /* TRACE dst, src, hv, nat */ 4150 for (; nat; nat = nat->nat_hnext[1]) { 4151 if (nat->nat_ifps[0] != NULL) { 4152 if ((ifp != NULL) && (ifp != nat->nat_ifps[0])) 4153 continue; 4154 } 4155 4156 if (nat->nat_pr[0] != fin->fin_p) 4157 continue; 4158 4159 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4160 { 4161 case NAT_INBOUND : 4162 if (nat->nat_v[0] != 4) 4163 continue; 4164 if (nat->nat_osrcaddr != src.s_addr || 4165 nat->nat_odstaddr != dst) 4166 continue; 4167 break; 4168 case NAT_OUTBOUND : 4169 if (nat->nat_v[1] != 4) 4170 continue; 4171 if (nat->nat_ndstaddr != src.s_addr || 4172 nat->nat_nsrcaddr != dst) 4173 continue; 4174 break; 4175 } 4176 4177 nflags = nat->nat_flags; 4178 if (!(nflags & (NAT_TCPUDP|SI_WILDP))) 4179 continue; 4180 4181 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nflags, 4182 NAT_INBOUND) == 1) { 4183 if ((fin->fin_flx & FI_IGNORE) != 0) 4184 break; 4185 if ((nflags & SI_CLONE) != 0) { 4186 nat = ipf_nat_clone(fin, nat); 4187 if (nat == NULL) 4188 break; 4189 } else { 4190 MUTEX_ENTER(&softn->ipf_nat_new); 4191 softn->ipf_nat_stats.ns_wilds--; 4192 MUTEX_EXIT(&softn->ipf_nat_new); 4193 } 4194 4195 if (nat->nat_dir == NAT_INBOUND) { 4196 if (nat->nat_osport == 0) { 4197 nat->nat_osport = sport; 4198 nat->nat_nsport = sport; 4199 } 4200 if (nat->nat_odport == 0) { 4201 nat->nat_odport = dport; 4202 nat->nat_ndport = dport; 4203 } 4204 } else if (nat->nat_dir == NAT_OUTBOUND) { 4205 if (nat->nat_osport == 0) { 4206 nat->nat_osport = dport; 4207 nat->nat_nsport = dport; 4208 } 4209 if (nat->nat_odport == 0) { 4210 nat->nat_odport = sport; 4211 nat->nat_ndport = sport; 4212 } 4213 } 4214 if ((nat->nat_ifps[0] == NULL) && (ifp != NULL)) { 4215 nat->nat_ifps[0] = ifp; 4216 nat->nat_mtu[0] = GETIFMTU_4(ifp); 4217 } 4218 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4219 ipf_nat_tabmove(softn, nat); 4220 break; 4221 } 4222 } 4223 4224 MUTEX_DOWNGRADE(&softc->ipf_nat); 4225 4226 if (nat == NULL) { 4227 NBUMPSIDE(0, ns_lookup_miss); 4228 } 4229 return nat; 4230 } 4231 4232 4233 /* ------------------------------------------------------------------------ */ 4234 /* Function: ipf_nat_tabmove */ 4235 /* Returns: Nil */ 4236 /* Parameters: softn(I) - pointer to NAT context structure */ 4237 /* nat(I) - pointer to NAT structure */ 4238 /* Write Lock: ipf_nat */ 4239 /* */ 4240 /* This function is only called for TCP/UDP NAT table entries where the */ 4241 /* original was placed in the table without hashing on the ports and we now */ 4242 /* want to include hashing on port numbers. */ 4243 /* ------------------------------------------------------------------------ */ 4244 static void 4245 ipf_nat_tabmove(ipf_nat_softc_t *softn, nat_t *nat) 4246 { 4247 u_int hv0, hv1, rhv0, rhv1; 4248 natstat_t *nsp; 4249 nat_t **natp; 4250 4251 if (nat->nat_flags & SI_CLONE) 4252 return; 4253 4254 nsp = &softn->ipf_nat_stats; 4255 /* 4256 * Remove the NAT entry from the old location 4257 */ 4258 if (nat->nat_hnext[0]) 4259 nat->nat_hnext[0]->nat_phnext[0] = nat->nat_phnext[0]; 4260 *nat->nat_phnext[0] = nat->nat_hnext[0]; 4261 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 4262 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 4263 4264 ASSERT(nsp->ns_side[0].ns_bucketlen[hv0] > 0); 4265 nsp->ns_side[0].ns_bucketlen[hv0]--; 4266 4267 if (nat->nat_hnext[1]) 4268 nat->nat_hnext[1]->nat_phnext[1] = nat->nat_phnext[1]; 4269 *nat->nat_phnext[1] = nat->nat_hnext[1]; 4270 ASSERT(nsp->ns_side[1].ns_bucketlen[hv1] > 0); 4271 nsp->ns_side[1].ns_bucketlen[hv1]--; 4272 4273 /* 4274 * Add into the NAT table in the new position 4275 */ 4276 rhv0 = NAT_HASH_FN(nat->nat_osrcaddr, nat->nat_osport, 0xffffffff); 4277 rhv0 = NAT_HASH_FN(nat->nat_odstaddr, rhv0 + nat->nat_odport, 4278 0xffffffff); 4279 rhv1 = NAT_HASH_FN(nat->nat_nsrcaddr, nat->nat_nsport, 0xffffffff); 4280 rhv1 = NAT_HASH_FN(nat->nat_ndstaddr, rhv1 + nat->nat_ndport, 4281 0xffffffff); 4282 4283 if ((nat->nat_dir & NAT_OUTBOUND) == NAT_OUTBOUND) { 4284 nat->nat_hv[0] = rhv0; 4285 nat->nat_hv[1] = rhv1; 4286 } else { 4287 nat->nat_hv[0] = rhv1; 4288 nat->nat_hv[1] = rhv0; 4289 } 4290 4291 hv0 = nat->nat_hv[0] % softn->ipf_nat_table_sz; 4292 hv1 = nat->nat_hv[1] % softn->ipf_nat_table_sz; 4293 4294 /* TRACE nat_osrcaddr, nat_osport, nat_odstaddr, nat_odport, hv0 */ 4295 /* TRACE nat_nsrcaddr, nat_nsport, nat_ndstaddr, nat_ndport, hv1 */ 4296 4297 natp = &softn->ipf_nat_table[0][hv0]; 4298 if (*natp) 4299 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 4300 nat->nat_phnext[0] = natp; 4301 nat->nat_hnext[0] = *natp; 4302 *natp = nat; 4303 nsp->ns_side[0].ns_bucketlen[hv0]++; 4304 4305 natp = &softn->ipf_nat_table[1][hv1]; 4306 if (*natp) 4307 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 4308 nat->nat_phnext[1] = natp; 4309 nat->nat_hnext[1] = *natp; 4310 *natp = nat; 4311 nsp->ns_side[1].ns_bucketlen[hv1]++; 4312 } 4313 4314 4315 /* ------------------------------------------------------------------------ */ 4316 /* Function: ipf_nat_outlookup */ 4317 /* Returns: nat_t* - NULL == no match, */ 4318 /* else pointer to matching NAT entry */ 4319 /* Parameters: fin(I) - pointer to packet information */ 4320 /* flags(I) - NAT flags for this packet */ 4321 /* p(I) - protocol for this packet */ 4322 /* src(I) - source IP address */ 4323 /* dst(I) - destination IP address */ 4324 /* rw(I) - 1 == write lock on held, 0 == read lock. */ 4325 /* */ 4326 /* Lookup a nat entry based on the source 'real' ip address/port and */ 4327 /* destination address/port. We use this lookup when sending a packet out, */ 4328 /* we're looking for a table entry, based on the source address. */ 4329 /* */ 4330 /* NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY. */ 4331 /* */ 4332 /* NOTE: IT IS ASSUMED THAT IS ONLY HELD WITH A READ LOCK WHEN */ 4333 /* THIS FUNCTION IS CALLED WITH NAT_SEARCH SET IN nflags. */ 4334 /* */ 4335 /* flags -> relevant are IPN_UDP/IPN_TCP/IPN_ICMPQUERY that indicate if */ 4336 /* the packet is of said protocol */ 4337 /* ------------------------------------------------------------------------ */ 4338 nat_t * 4339 ipf_nat_outlookup(fr_info_t *fin, u_int flags, u_int p, struct in_addr src, 4340 struct in_addr dst) 4341 { 4342 ipf_main_softc_t *softc = fin->fin_main_soft; 4343 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4344 u_short sport, dport; 4345 ipnat_t *ipn; 4346 nat_t *nat; 4347 void *ifp; 4348 u_int hv; 4349 4350 ifp = fin->fin_ifp; 4351 4352 switch (p) 4353 { 4354 case IPPROTO_TCP : 4355 case IPPROTO_UDP : 4356 sport = htons(fin->fin_data[0]); 4357 dport = htons(fin->fin_data[1]); 4358 break; 4359 case IPPROTO_ICMP : 4360 sport = 0; 4361 dport = fin->fin_data[1]; 4362 break; 4363 default : 4364 sport = 0; 4365 dport = 0; 4366 break; 4367 } 4368 4369 if ((flags & SI_WILDP) != 0) 4370 goto find_out_wild_ports; 4371 4372 hv = NAT_HASH_FN(src.s_addr, sport, 0xffffffff); 4373 hv = NAT_HASH_FN(dst.s_addr, hv + dport, softn->ipf_nat_table_sz); 4374 nat = softn->ipf_nat_table[0][hv]; 4375 4376 /* TRACE src, sport, dst, dport, hv, nat */ 4377 4378 for (; nat; nat = nat->nat_hnext[0]) { 4379 if (nat->nat_ifps[1] != NULL) { 4380 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4381 continue; 4382 } 4383 4384 if (nat->nat_pr[1] != p) 4385 continue; 4386 4387 switch (nat->nat_dir) 4388 { 4389 case NAT_INBOUND : 4390 case NAT_DIVERTIN : 4391 if (nat->nat_v[1] != 4) 4392 continue; 4393 if (nat->nat_ndstaddr != src.s_addr || 4394 nat->nat_nsrcaddr != dst.s_addr) 4395 continue; 4396 4397 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4398 if (nat->nat_ndport != sport) 4399 continue; 4400 if (nat->nat_nsport != dport) 4401 continue; 4402 4403 } else if (p == IPPROTO_ICMP) { 4404 if (nat->nat_nicmpid != dport) { 4405 continue; 4406 } 4407 } 4408 break; 4409 case NAT_OUTBOUND : 4410 case NAT_DIVERTOUT : 4411 if (nat->nat_v[0] != 4) 4412 continue; 4413 if (nat->nat_osrcaddr != src.s_addr || 4414 nat->nat_odstaddr != dst.s_addr) 4415 continue; 4416 4417 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 4418 if (nat->nat_odport != dport) 4419 continue; 4420 if (nat->nat_osport != sport) 4421 continue; 4422 4423 } else if (p == IPPROTO_ICMP) { 4424 if (nat->nat_oicmpid != dport) { 4425 continue; 4426 } 4427 } 4428 break; 4429 } 4430 4431 ipn = nat->nat_ptr; 4432 if ((ipn != NULL) && (nat->nat_aps != NULL)) 4433 if (ipf_proxy_match(fin, nat) != 0) 4434 continue; 4435 4436 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4437 nat->nat_ifps[1] = ifp; 4438 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4439 } 4440 return nat; 4441 } 4442 4443 /* 4444 * So if we didn't find it but there are wildcard members in the hash 4445 * table, go back and look for them. We do this search and update here 4446 * because it is modifying the NAT table and we want to do this only 4447 * for the first packet that matches. The exception, of course, is 4448 * for "dummy" (FI_IGNORE) lookups. 4449 */ 4450 find_out_wild_ports: 4451 if (!(flags & NAT_TCPUDP) || !(flags & NAT_SEARCH)) { 4452 NBUMPSIDEX(1, ns_lookup_miss, ns_lookup_miss_1); 4453 return NULL; 4454 } 4455 if (softn->ipf_nat_stats.ns_wilds == 0 || (fin->fin_flx & FI_NOWILD)) { 4456 NBUMPSIDEX(1, ns_lookup_nowild, ns_lookup_nowild_1); 4457 return NULL; 4458 } 4459 4460 RWLOCK_EXIT(&softc->ipf_nat); 4461 4462 hv = NAT_HASH_FN(src.s_addr, 0, 0xffffffff); 4463 hv = NAT_HASH_FN(dst.s_addr, hv, softn->ipf_nat_table_sz); 4464 4465 WRITE_ENTER(&softc->ipf_nat); 4466 4467 nat = softn->ipf_nat_table[0][hv]; 4468 for (; nat; nat = nat->nat_hnext[0]) { 4469 if (nat->nat_ifps[1] != NULL) { 4470 if ((ifp != NULL) && (ifp != nat->nat_ifps[1])) 4471 continue; 4472 } 4473 4474 if (nat->nat_pr[1] != fin->fin_p) 4475 continue; 4476 4477 switch (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND)) 4478 { 4479 case NAT_INBOUND : 4480 if (nat->nat_v[1] != 4) 4481 continue; 4482 if (nat->nat_ndstaddr != src.s_addr || 4483 nat->nat_nsrcaddr != dst.s_addr) 4484 continue; 4485 break; 4486 case NAT_OUTBOUND : 4487 if (nat->nat_v[0] != 4) 4488 continue; 4489 if (nat->nat_osrcaddr != src.s_addr || 4490 nat->nat_odstaddr != dst.s_addr) 4491 continue; 4492 break; 4493 } 4494 4495 if (!(nat->nat_flags & (NAT_TCPUDP|SI_WILDP))) 4496 continue; 4497 4498 if (ipf_nat_wildok(nat, (int)sport, (int)dport, nat->nat_flags, 4499 NAT_OUTBOUND) == 1) { 4500 if ((fin->fin_flx & FI_IGNORE) != 0) 4501 break; 4502 if ((nat->nat_flags & SI_CLONE) != 0) { 4503 nat = ipf_nat_clone(fin, nat); 4504 if (nat == NULL) 4505 break; 4506 } else { 4507 MUTEX_ENTER(&softn->ipf_nat_new); 4508 softn->ipf_nat_stats.ns_wilds--; 4509 MUTEX_EXIT(&softn->ipf_nat_new); 4510 } 4511 4512 if (nat->nat_dir == NAT_OUTBOUND) { 4513 if (nat->nat_osport == 0) { 4514 nat->nat_osport = sport; 4515 nat->nat_nsport = sport; 4516 } 4517 if (nat->nat_odport == 0) { 4518 nat->nat_odport = dport; 4519 nat->nat_ndport = dport; 4520 } 4521 } else if (nat->nat_dir == NAT_INBOUND) { 4522 if (nat->nat_osport == 0) { 4523 nat->nat_osport = dport; 4524 nat->nat_nsport = dport; 4525 } 4526 if (nat->nat_odport == 0) { 4527 nat->nat_odport = sport; 4528 nat->nat_ndport = sport; 4529 } 4530 } 4531 if ((nat->nat_ifps[1] == NULL) && (ifp != NULL)) { 4532 nat->nat_ifps[1] = ifp; 4533 nat->nat_mtu[1] = GETIFMTU_4(ifp); 4534 } 4535 nat->nat_flags &= ~(SI_W_DPORT|SI_W_SPORT); 4536 ipf_nat_tabmove(softn, nat); 4537 break; 4538 } 4539 } 4540 4541 MUTEX_DOWNGRADE(&softc->ipf_nat); 4542 4543 if (nat == NULL) { 4544 NBUMPSIDE(1, ns_lookup_miss); 4545 } 4546 return nat; 4547 } 4548 4549 4550 /* ------------------------------------------------------------------------ */ 4551 /* Function: ipf_nat_lookupredir */ 4552 /* Returns: nat_t* - NULL == no match, */ 4553 /* else pointer to matching NAT entry */ 4554 /* Parameters: softc(I) - pointer to soft context main structure */ 4555 /* np(I) - pointer to description of packet to find NAT */ 4556 /* table entry for. */ 4557 /* */ 4558 /* Lookup the NAT tables to search for a matching redirect */ 4559 /* The contents of natlookup_t should imitate those found in a packet that */ 4560 /* would be translated - ie a packet coming in for RDR or going out for MAP.*/ 4561 /* We can do the lookup in one of two ways, imitating an inbound or */ 4562 /* outbound packet. By default we assume outbound, unless IPN_IN is set. */ 4563 /* For IN, the fields are set as follows: */ 4564 /* nl_real* = source information */ 4565 /* nl_out* = destination information (translated) */ 4566 /* For an out packet, the fields are set like this: */ 4567 /* nl_in* = source information (untranslated) */ 4568 /* nl_out* = destination information (translated) */ 4569 /* ------------------------------------------------------------------------ */ 4570 nat_t * 4571 ipf_nat_lookupredir(ipf_main_softc_t *softc, natlookup_t *np) 4572 { 4573 fr_info_t fi; 4574 nat_t *nat; 4575 4576 bzero((char *)&fi, sizeof(fi)); 4577 fi.fin_main_soft = softc; 4578 if (np->nl_flags & IPN_IN) { 4579 fi.fin_data[0] = ntohs(np->nl_realport); 4580 fi.fin_data[1] = ntohs(np->nl_outport); 4581 } else { 4582 fi.fin_data[0] = ntohs(np->nl_inport); 4583 fi.fin_data[1] = ntohs(np->nl_outport); 4584 } 4585 if (np->nl_flags & IPN_TCP) 4586 fi.fin_p = IPPROTO_TCP; 4587 else if (np->nl_flags & IPN_UDP) 4588 fi.fin_p = IPPROTO_UDP; 4589 else if (np->nl_flags & (IPN_ICMPERR|IPN_ICMPQUERY)) 4590 fi.fin_p = IPPROTO_ICMP; 4591 4592 /* 4593 * We can do two sorts of lookups: 4594 * - IPN_IN: we have the `real' and `out' address, look for `in'. 4595 * - default: we have the `in' and `out' address, look for `real'. 4596 */ 4597 if (np->nl_flags & IPN_IN) { 4598 if ((nat = ipf_nat_inlookup(&fi, np->nl_flags, fi.fin_p, 4599 np->nl_realip, np->nl_outip))) { 4600 np->nl_inip = nat->nat_odstip; 4601 np->nl_inport = nat->nat_odport; 4602 } 4603 } else { 4604 /* 4605 * If nl_inip is non null, this is a lookup based on the real 4606 * ip address. Else, we use the fake. 4607 */ 4608 if ((nat = ipf_nat_outlookup(&fi, np->nl_flags, fi.fin_p, 4609 np->nl_inip, np->nl_outip))) { 4610 4611 if ((np->nl_flags & IPN_FINDFORWARD) != 0) { 4612 fr_info_t fin; 4613 bzero((char *)&fin, sizeof(fin)); 4614 fin.fin_p = nat->nat_pr[0]; 4615 fin.fin_data[0] = ntohs(nat->nat_ndport); 4616 fin.fin_data[1] = ntohs(nat->nat_nsport); 4617 if (ipf_nat_inlookup(&fin, np->nl_flags, 4618 fin.fin_p, nat->nat_ndstip, 4619 nat->nat_nsrcip) != NULL) { 4620 np->nl_flags &= ~IPN_FINDFORWARD; 4621 } 4622 } 4623 4624 np->nl_realip = nat->nat_odstip; 4625 np->nl_realport = nat->nat_odport; 4626 } 4627 } 4628 4629 return nat; 4630 } 4631 4632 4633 /* ------------------------------------------------------------------------ */ 4634 /* Function: ipf_nat_match */ 4635 /* Returns: int - 0 == no match, 1 == match */ 4636 /* Parameters: fin(I) - pointer to packet information */ 4637 /* np(I) - pointer to NAT rule */ 4638 /* */ 4639 /* Pull the matching of a packet against a NAT rule out of that complex */ 4640 /* loop inside ipf_nat_checkin() and lay it out properly in its own function. */ 4641 /* ------------------------------------------------------------------------ */ 4642 static int 4643 ipf_nat_match(fr_info_t *fin, ipnat_t *np) 4644 { 4645 ipf_main_softc_t *softc = fin->fin_main_soft; 4646 frtuc_t *ft; 4647 int match; 4648 4649 match = 0; 4650 switch (np->in_osrcatype) 4651 { 4652 case FRI_NORMAL : 4653 match = ((fin->fin_saddr & np->in_osrcmsk) != np->in_osrcaddr); 4654 break; 4655 case FRI_LOOKUP : 4656 match = (*np->in_osrcfunc)(softc, np->in_osrcptr, 4657 4, &fin->fin_saddr, fin->fin_plen); 4658 break; 4659 } 4660 match ^= ((np->in_flags & IPN_NOTSRC) != 0); 4661 if (match) 4662 return 0; 4663 4664 match = 0; 4665 switch (np->in_odstatype) 4666 { 4667 case FRI_NORMAL : 4668 match = ((fin->fin_daddr & np->in_odstmsk) != np->in_odstaddr); 4669 break; 4670 case FRI_LOOKUP : 4671 match = (*np->in_odstfunc)(softc, np->in_odstptr, 4672 4, &fin->fin_daddr, fin->fin_plen); 4673 break; 4674 } 4675 4676 match ^= ((np->in_flags & IPN_NOTDST) != 0); 4677 if (match) 4678 return 0; 4679 4680 ft = &np->in_tuc; 4681 if (!(fin->fin_flx & FI_TCPUDP) || 4682 (fin->fin_flx & (FI_SHORT|FI_FRAGBODY))) { 4683 if (ft->ftu_scmp || ft->ftu_dcmp) 4684 return 0; 4685 return 1; 4686 } 4687 4688 return ipf_tcpudpchk(&fin->fin_fi, ft); 4689 } 4690 4691 4692 /* ------------------------------------------------------------------------ */ 4693 /* Function: ipf_nat_update */ 4694 /* Returns: Nil */ 4695 /* Parameters: fin(I) - pointer to packet information */ 4696 /* nat(I) - pointer to NAT structure */ 4697 /* */ 4698 /* Updates the lifetime of a NAT table entry for non-TCP packets. Must be */ 4699 /* called with fin_rev updated - i.e. after calling ipf_nat_proto(). */ 4700 /* */ 4701 /* This *MUST* be called after ipf_nat_proto() as it expects fin_rev to */ 4702 /* already be set. */ 4703 /* ------------------------------------------------------------------------ */ 4704 void 4705 ipf_nat_update(fr_info_t *fin, nat_t *nat) 4706 { 4707 ipf_main_softc_t *softc = fin->fin_main_soft; 4708 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4709 ipftq_t *ifq, *ifq2; 4710 ipftqent_t *tqe; 4711 ipnat_t *np = nat->nat_ptr; 4712 4713 tqe = &nat->nat_tqe; 4714 ifq = tqe->tqe_ifq; 4715 4716 /* 4717 * We allow over-riding of NAT timeouts from NAT rules, even for 4718 * TCP, however, if it is TCP and there is no rule timeout set, 4719 * then do not update the timeout here. 4720 */ 4721 if (np != NULL) { 4722 np->in_bytes[fin->fin_rev] += fin->fin_plen; 4723 ifq2 = np->in_tqehead[fin->fin_rev]; 4724 } else { 4725 ifq2 = NULL; 4726 } 4727 4728 if (nat->nat_pr[0] == IPPROTO_TCP && ifq2 == NULL) { 4729 (void) ipf_tcp_age(&nat->nat_tqe, fin, softn->ipf_nat_tcptq, 4730 0, 2); 4731 } else { 4732 if (ifq2 == NULL) { 4733 if (nat->nat_pr[0] == IPPROTO_UDP) 4734 ifq2 = fin->fin_rev ? &softn->ipf_nat_udpacktq : 4735 &softn->ipf_nat_udptq; 4736 else if (nat->nat_pr[0] == IPPROTO_ICMP || 4737 nat->nat_pr[0] == IPPROTO_ICMPV6) 4738 ifq2 = fin->fin_rev ? &softn->ipf_nat_icmpacktq: 4739 &softn->ipf_nat_icmptq; 4740 else 4741 ifq2 = &softn->ipf_nat_iptq; 4742 } 4743 4744 ipf_movequeue(softc->ipf_ticks, tqe, ifq, ifq2); 4745 } 4746 } 4747 4748 4749 /* ------------------------------------------------------------------------ */ 4750 /* Function: ipf_nat_checkout */ 4751 /* Returns: int - -1 == packet failed NAT checks so block it, */ 4752 /* 0 == no packet translation occurred, */ 4753 /* 1 == packet was successfully translated. */ 4754 /* Parameters: fin(I) - pointer to packet information */ 4755 /* passp(I) - pointer to filtering result flags */ 4756 /* */ 4757 /* Check to see if an outcoming packet should be changed. ICMP packets are */ 4758 /* first checked to see if they match an existing entry (if an error), */ 4759 /* otherwise a search of the current NAT table is made. If neither results */ 4760 /* in a match then a search for a matching NAT rule is made. Create a new */ 4761 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 4762 /* packet header(s) as required. */ 4763 /* ------------------------------------------------------------------------ */ 4764 int 4765 ipf_nat_checkout(fr_info_t *fin, u_32_t *passp) 4766 { 4767 ipnat_t *np = NULL, *npnext; 4768 struct ifnet *ifp, *sifp; 4769 ipf_main_softc_t *softc; 4770 ipf_nat_softc_t *softn; 4771 tcphdr_t *tcp = NULL; 4772 int rval, natfailed; 4773 u_int nflags = 0; 4774 u_32_t ipa, iph; 4775 int natadd = 1; 4776 frentry_t *fr; 4777 nat_t *nat; 4778 4779 if (fin->fin_v == 6) { 4780 #ifdef USE_INET6 4781 return ipf_nat6_checkout(fin, passp); 4782 #else 4783 return 0; 4784 #endif 4785 } 4786 4787 softc = fin->fin_main_soft; 4788 softn = softc->ipf_nat_soft; 4789 4790 if (softn->ipf_nat_lock != 0) 4791 return 0; 4792 if (softn->ipf_nat_stats.ns_rules == 0 && 4793 softn->ipf_nat_instances == NULL) 4794 return 0; 4795 4796 natfailed = 0; 4797 fr = fin->fin_fr; 4798 sifp = fin->fin_ifp; 4799 if (fr != NULL) { 4800 ifp = fr->fr_tifs[fin->fin_rev].fd_ptr; 4801 if ((ifp != NULL) && (ifp != (void *)-1)) 4802 fin->fin_ifp = ifp; 4803 } 4804 ifp = fin->fin_ifp; 4805 4806 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 4807 switch (fin->fin_p) 4808 { 4809 case IPPROTO_TCP : 4810 nflags = IPN_TCP; 4811 break; 4812 case IPPROTO_UDP : 4813 nflags = IPN_UDP; 4814 break; 4815 case IPPROTO_ICMP : 4816 /* 4817 * This is an incoming packet, so the destination is 4818 * the icmp_id and the source port equals 0 4819 */ 4820 if ((fin->fin_flx & FI_ICMPQUERY) != 0) 4821 nflags = IPN_ICMPQUERY; 4822 break; 4823 default : 4824 break; 4825 } 4826 4827 if ((nflags & IPN_TCPUDP)) 4828 tcp = fin->fin_dp; 4829 } 4830 4831 ipa = fin->fin_saddr; 4832 4833 READ_ENTER(&softc->ipf_nat); 4834 4835 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 4836 (nat = ipf_nat_icmperror(fin, &nflags, NAT_OUTBOUND))) 4837 /*EMPTY*/; 4838 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 4839 natadd = 0; 4840 else if ((nat = ipf_nat_outlookup(fin, nflags|NAT_SEARCH, 4841 (u_int)fin->fin_p, fin->fin_src, 4842 fin->fin_dst))) { 4843 nflags = nat->nat_flags; 4844 } else if (fin->fin_off == 0) { 4845 u_32_t hv, msk, nmsk = 0; 4846 4847 /* 4848 * If there is no current entry in the nat table for this IP#, 4849 * create one for it (if there is a matching rule). 4850 */ 4851 maskloop: 4852 msk = softn->ipf_nat_map_active_masks[nmsk]; 4853 iph = ipa & msk; 4854 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_maprules_sz); 4855 retry_roundrobin: 4856 for (np = softn->ipf_nat_map_rules[hv]; np; np = npnext) { 4857 npnext = np->in_mnext; 4858 if ((np->in_ifps[1] && (np->in_ifps[1] != ifp))) 4859 continue; 4860 if (np->in_v[0] != 4) 4861 continue; 4862 if (np->in_pr[1] && (np->in_pr[1] != fin->fin_p)) 4863 continue; 4864 if ((np->in_flags & IPN_RF) && 4865 !(np->in_flags & nflags)) 4866 continue; 4867 if (np->in_flags & IPN_FILTER) { 4868 switch (ipf_nat_match(fin, np)) 4869 { 4870 case 0 : 4871 continue; 4872 case -1 : 4873 rval = -1; 4874 goto outmatchfail; 4875 case 1 : 4876 default : 4877 break; 4878 } 4879 } else if ((ipa & np->in_osrcmsk) != np->in_osrcaddr) 4880 continue; 4881 4882 if ((fr != NULL) && 4883 !ipf_matchtag(&np->in_tag, &fr->fr_nattag)) 4884 continue; 4885 4886 if (np->in_plabel != -1) { 4887 if (((np->in_flags & IPN_FILTER) == 0) && 4888 (np->in_odport != fin->fin_data[1])) 4889 continue; 4890 if (ipf_proxy_ok(fin, tcp, np) == 0) 4891 continue; 4892 } 4893 4894 if (np->in_flags & IPN_NO) { 4895 np->in_hits++; 4896 break; 4897 } 4898 MUTEX_ENTER(&softn->ipf_nat_new); 4899 /* 4900 * If we've matched a round-robin rule but it has 4901 * moved in the list since we got it, start over as 4902 * this is now no longer correct. 4903 */ 4904 if (npnext != np->in_mnext) { 4905 if ((np->in_flags & IPN_ROUNDR) != 0) { 4906 MUTEX_EXIT(&softn->ipf_nat_new); 4907 goto retry_roundrobin; 4908 } 4909 npnext = np->in_mnext; 4910 } 4911 4912 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_OUTBOUND); 4913 MUTEX_EXIT(&softn->ipf_nat_new); 4914 if (nat != NULL) { 4915 natfailed = 0; 4916 break; 4917 } 4918 natfailed = -1; 4919 } 4920 if ((np == NULL) && (nmsk < softn->ipf_nat_map_max)) { 4921 nmsk++; 4922 goto maskloop; 4923 } 4924 } 4925 4926 if (nat != NULL) { 4927 rval = ipf_nat_out(fin, nat, natadd, nflags); 4928 if (rval == 1) { 4929 MUTEX_ENTER(&nat->nat_lock); 4930 ipf_nat_update(fin, nat); 4931 nat->nat_bytes[1] += fin->fin_plen; 4932 nat->nat_pkts[1]++; 4933 fin->fin_pktnum = nat->nat_pkts[1]; 4934 MUTEX_EXIT(&nat->nat_lock); 4935 } 4936 } else 4937 rval = natfailed; 4938 outmatchfail: 4939 RWLOCK_EXIT(&softc->ipf_nat); 4940 4941 switch (rval) 4942 { 4943 case -1 : 4944 if (passp != NULL) { 4945 DT1(frb_natv4out, fr_info_t *, fin); 4946 NBUMPSIDED(1, ns_drop); 4947 *passp = FR_BLOCK; 4948 fin->fin_reason = FRB_NATV4; 4949 } 4950 fin->fin_flx |= FI_BADNAT; 4951 NBUMPSIDED(1, ns_badnat); 4952 break; 4953 case 0 : 4954 NBUMPSIDE(1, ns_ignored); 4955 break; 4956 case 1 : 4957 NBUMPSIDE(1, ns_translated); 4958 break; 4959 } 4960 fin->fin_ifp = sifp; 4961 return rval; 4962 } 4963 4964 /* ------------------------------------------------------------------------ */ 4965 /* Function: ipf_nat_out */ 4966 /* Returns: int - -1 == packet failed NAT checks so block it, */ 4967 /* 1 == packet was successfully translated. */ 4968 /* Parameters: fin(I) - pointer to packet information */ 4969 /* nat(I) - pointer to NAT structure */ 4970 /* natadd(I) - flag indicating if it is safe to add frag cache */ 4971 /* nflags(I) - NAT flags set for this packet */ 4972 /* */ 4973 /* Translate a packet coming "out" on an interface. */ 4974 /* ------------------------------------------------------------------------ */ 4975 int 4976 ipf_nat_out(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) 4977 { 4978 ipf_main_softc_t *softc = fin->fin_main_soft; 4979 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 4980 icmphdr_t *icmp; 4981 tcphdr_t *tcp; 4982 ipnat_t *np; 4983 int skip; 4984 int i; 4985 4986 tcp = NULL; 4987 icmp = NULL; 4988 np = nat->nat_ptr; 4989 4990 if ((natadd != 0) && (fin->fin_flx & FI_FRAG) && (np != NULL)) 4991 (void) ipf_frag_natnew(softc, fin, 0, nat); 4992 4993 /* 4994 * Fix up checksums, not by recalculating them, but 4995 * simply computing adjustments. 4996 * This is only done for STREAMS based IP implementations where the 4997 * checksum has already been calculated by IP. In all other cases, 4998 * IPFilter is called before the checksum needs calculating so there 4999 * is no call to modify whatever is in the header now. 5000 */ 5001 if (nflags == IPN_ICMPERR) { 5002 u_32_t s1, s2, sumd, msumd; 5003 5004 s1 = LONG_SUM(ntohl(fin->fin_saddr)); 5005 if (nat->nat_dir == NAT_OUTBOUND) { 5006 s2 = LONG_SUM(ntohl(nat->nat_nsrcaddr)); 5007 } else { 5008 s2 = LONG_SUM(ntohl(nat->nat_odstaddr)); 5009 } 5010 CALC_SUMD(s1, s2, sumd); 5011 msumd = sumd; 5012 5013 s1 = LONG_SUM(ntohl(fin->fin_daddr)); 5014 if (nat->nat_dir == NAT_OUTBOUND) { 5015 s2 = LONG_SUM(ntohl(nat->nat_ndstaddr)); 5016 } else { 5017 s2 = LONG_SUM(ntohl(nat->nat_osrcaddr)); 5018 } 5019 CALC_SUMD(s1, s2, sumd); 5020 msumd += sumd; 5021 5022 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, msumd, 0); 5023 } 5024 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5025 defined(linux) || defined(BRIDGE_IPF) 5026 else { 5027 /* 5028 * Strictly speaking, this isn't necessary on BSD 5029 * kernels because they do checksum calculation after 5030 * this code has run BUT if ipfilter is being used 5031 * to do NAT as a bridge, that code doesn't exist. 5032 */ 5033 switch (nat->nat_dir) 5034 { 5035 case NAT_OUTBOUND : 5036 ipf_fix_outcksum(fin->fin_cksum & FI_CK_L4PART, 5037 &fin->fin_ip->ip_sum, 5038 nat->nat_ipsumd, 0); 5039 break; 5040 5041 case NAT_INBOUND : 5042 ipf_fix_incksum(fin->fin_cksum & FI_CK_L4PART, 5043 &fin->fin_ip->ip_sum, 5044 nat->nat_ipsumd, 0); 5045 break; 5046 5047 default : 5048 break; 5049 } 5050 } 5051 #endif 5052 5053 /* 5054 * Address assignment is after the checksum modification because 5055 * we are using the address in the packet for determining the 5056 * correct checksum offset (the ICMP error could be coming from 5057 * anyone...) 5058 */ 5059 switch (nat->nat_dir) 5060 { 5061 case NAT_OUTBOUND : 5062 fin->fin_ip->ip_src = nat->nat_nsrcip; 5063 fin->fin_saddr = nat->nat_nsrcaddr; 5064 fin->fin_ip->ip_dst = nat->nat_ndstip; 5065 fin->fin_daddr = nat->nat_ndstaddr; 5066 break; 5067 5068 case NAT_INBOUND : 5069 fin->fin_ip->ip_src = nat->nat_odstip; 5070 fin->fin_saddr = nat->nat_ndstaddr; 5071 fin->fin_ip->ip_dst = nat->nat_osrcip; 5072 fin->fin_daddr = nat->nat_nsrcaddr; 5073 break; 5074 5075 case NAT_DIVERTIN : 5076 { 5077 mb_t *m; 5078 5079 skip = ipf_nat_decap(fin, nat); 5080 if (skip <= 0) { 5081 NBUMPSIDED(1, ns_decap_fail); 5082 return -1; 5083 } 5084 5085 m = fin->fin_m; 5086 5087 #if defined(MENTAT) && defined(_KERNEL) 5088 m->b_rptr += skip; 5089 #else 5090 m->m_data += skip; 5091 m->m_len -= skip; 5092 5093 # ifdef M_PKTHDR 5094 if (m->m_flags & M_PKTHDR) 5095 m->m_pkthdr.len -= skip; 5096 # endif 5097 #endif 5098 5099 MUTEX_ENTER(&nat->nat_lock); 5100 ipf_nat_update(fin, nat); 5101 MUTEX_EXIT(&nat->nat_lock); 5102 fin->fin_flx |= FI_NATED; 5103 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5104 fin->fin_nattag = &np->in_tag; 5105 return 1; 5106 /* NOTREACHED */ 5107 } 5108 5109 case NAT_DIVERTOUT : 5110 { 5111 u_32_t s1, s2, sumd; 5112 udphdr_t *uh; 5113 ip_t *ip; 5114 mb_t *m; 5115 5116 m = M_DUP(np->in_divmp); 5117 if (m == NULL) { 5118 NBUMPSIDED(1, ns_divert_dup); 5119 return -1; 5120 } 5121 5122 ip = MTOD(m, ip_t *); 5123 ip->ip_id = htons(ipf_nextipid(fin)); 5124 s2 = ntohs(ip->ip_id); 5125 5126 s1 = ip->ip_len; 5127 ip->ip_len = ntohs(ip->ip_len); 5128 ip->ip_len += fin->fin_plen; 5129 ip->ip_len = htons(ip->ip_len); 5130 s2 += ntohs(ip->ip_len); 5131 CALC_SUMD(s1, s2, sumd); 5132 5133 uh = (udphdr_t *)(ip + 1); 5134 uh->uh_ulen += fin->fin_plen; 5135 uh->uh_ulen = htons(uh->uh_ulen); 5136 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5137 defined(linux) || defined(BRIDGE_IPF) 5138 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5139 #endif 5140 5141 PREP_MB_T(fin, m); 5142 5143 fin->fin_src = ip->ip_src; 5144 fin->fin_dst = ip->ip_dst; 5145 fin->fin_ip = ip; 5146 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5147 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + IPv4 hdr */ 5148 5149 nflags &= ~IPN_TCPUDPICMP; 5150 5151 break; 5152 } 5153 5154 default : 5155 break; 5156 } 5157 5158 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5159 u_short *csump; 5160 5161 if ((nat->nat_nsport != 0) && (nflags & IPN_TCPUDP)) { 5162 tcp = fin->fin_dp; 5163 5164 switch (nat->nat_dir) 5165 { 5166 case NAT_OUTBOUND : 5167 tcp->th_sport = nat->nat_nsport; 5168 fin->fin_data[0] = ntohs(nat->nat_nsport); 5169 tcp->th_dport = nat->nat_ndport; 5170 fin->fin_data[1] = ntohs(nat->nat_ndport); 5171 break; 5172 5173 case NAT_INBOUND : 5174 tcp->th_sport = nat->nat_odport; 5175 fin->fin_data[0] = ntohs(nat->nat_odport); 5176 tcp->th_dport = nat->nat_osport; 5177 fin->fin_data[1] = ntohs(nat->nat_osport); 5178 break; 5179 } 5180 } 5181 5182 if ((nat->nat_oicmpid != 0) && (nflags & IPN_ICMPQUERY)) { 5183 icmp = fin->fin_dp; 5184 5185 switch (nat->nat_dir) 5186 { 5187 case NAT_OUTBOUND : 5188 icmp->icmp_id = nat->nat_nicmpid; 5189 break; 5190 case NAT_INBOUND : 5191 icmp->icmp_id = nat->nat_oicmpid; 5192 break; 5193 } 5194 } 5195 5196 csump = ipf_nat_proto(fin, nat, nflags); 5197 5198 /* 5199 * The above comments do not hold for layer 4 (or higher) 5200 * checksums... 5201 */ 5202 if (csump != NULL) { 5203 if (nat->nat_dir == NAT_OUTBOUND) 5204 ipf_fix_outcksum(fin->fin_cksum, csump, 5205 nat->nat_sumd[0], 5206 nat->nat_sumd[1] + 5207 fin->fin_dlen); 5208 else 5209 ipf_fix_incksum(fin->fin_cksum, csump, 5210 nat->nat_sumd[0], 5211 nat->nat_sumd[1] + 5212 fin->fin_dlen); 5213 } 5214 } 5215 5216 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5217 /* ------------------------------------------------------------- */ 5218 /* A few quick notes: */ 5219 /* Following are test conditions prior to calling the */ 5220 /* ipf_proxy_check routine. */ 5221 /* */ 5222 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5223 /* with a redirect rule, we attempt to match the packet's */ 5224 /* source port against in_dport, otherwise we'd compare the */ 5225 /* packet's destination. */ 5226 /* ------------------------------------------------------------- */ 5227 if ((np != NULL) && (np->in_apr != NULL)) { 5228 i = ipf_proxy_check(fin, nat); 5229 if (i == 0) { 5230 i = 1; 5231 } else if (i == -1) { 5232 NBUMPSIDED(1, ns_ipf_proxy_fail); 5233 } 5234 } else { 5235 i = 1; 5236 } 5237 fin->fin_flx |= FI_NATED; 5238 return i; 5239 } 5240 5241 5242 /* ------------------------------------------------------------------------ */ 5243 /* Function: ipf_nat_checkin */ 5244 /* Returns: int - -1 == packet failed NAT checks so block it, */ 5245 /* 0 == no packet translation occurred, */ 5246 /* 1 == packet was successfully translated. */ 5247 /* Parameters: fin(I) - pointer to packet information */ 5248 /* passp(I) - pointer to filtering result flags */ 5249 /* */ 5250 /* Check to see if an incoming packet should be changed. ICMP packets are */ 5251 /* first checked to see if they match an existing entry (if an error), */ 5252 /* otherwise a search of the current NAT table is made. If neither results */ 5253 /* in a match then a search for a matching NAT rule is made. Create a new */ 5254 /* NAT entry if a we matched a NAT rule. Lastly, actually change the */ 5255 /* packet header(s) as required. */ 5256 /* ------------------------------------------------------------------------ */ 5257 int 5258 ipf_nat_checkin(fr_info_t *fin, u_32_t *passp) 5259 { 5260 ipf_main_softc_t *softc; 5261 ipf_nat_softc_t *softn; 5262 u_int nflags, natadd; 5263 ipnat_t *np, *npnext; 5264 int rval, natfailed; 5265 struct ifnet *ifp; 5266 struct in_addr in; 5267 icmphdr_t *icmp; 5268 tcphdr_t *tcp; 5269 u_short dport; 5270 nat_t *nat; 5271 u_32_t iph; 5272 5273 softc = fin->fin_main_soft; 5274 softn = softc->ipf_nat_soft; 5275 5276 if (softn->ipf_nat_lock != 0) 5277 return 0; 5278 if (softn->ipf_nat_stats.ns_rules == 0 && 5279 softn->ipf_nat_instances == NULL) 5280 return 0; 5281 5282 tcp = NULL; 5283 icmp = NULL; 5284 dport = 0; 5285 natadd = 1; 5286 nflags = 0; 5287 natfailed = 0; 5288 ifp = fin->fin_ifp; 5289 5290 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5291 switch (fin->fin_p) 5292 { 5293 case IPPROTO_TCP : 5294 nflags = IPN_TCP; 5295 break; 5296 case IPPROTO_UDP : 5297 nflags = IPN_UDP; 5298 break; 5299 case IPPROTO_ICMP : 5300 icmp = fin->fin_dp; 5301 5302 /* 5303 * This is an incoming packet, so the destination is 5304 * the icmp_id and the source port equals 0 5305 */ 5306 if ((fin->fin_flx & FI_ICMPQUERY) != 0) { 5307 nflags = IPN_ICMPQUERY; 5308 dport = icmp->icmp_id; 5309 } break; 5310 default : 5311 break; 5312 } 5313 5314 if ((nflags & IPN_TCPUDP)) { 5315 tcp = fin->fin_dp; 5316 dport = fin->fin_data[1]; 5317 } 5318 } 5319 5320 in = fin->fin_dst; 5321 5322 READ_ENTER(&softc->ipf_nat); 5323 5324 if ((fin->fin_p == IPPROTO_ICMP) && !(nflags & IPN_ICMPQUERY) && 5325 (nat = ipf_nat_icmperror(fin, &nflags, NAT_INBOUND))) 5326 /*EMPTY*/; 5327 else if ((fin->fin_flx & FI_FRAG) && (nat = ipf_frag_natknown(fin))) 5328 natadd = 0; 5329 else if ((nat = ipf_nat_inlookup(fin, nflags|NAT_SEARCH, 5330 (u_int)fin->fin_p, 5331 fin->fin_src, in))) { 5332 nflags = nat->nat_flags; 5333 } else if (fin->fin_off == 0) { 5334 u_32_t hv, msk, rmsk = 0; 5335 5336 /* 5337 * If there is no current entry in the nat table for this IP#, 5338 * create one for it (if there is a matching rule). 5339 */ 5340 maskloop: 5341 msk = softn->ipf_nat_rdr_active_masks[rmsk]; 5342 iph = in.s_addr & msk; 5343 hv = NAT_HASH_FN(iph, 0, softn->ipf_nat_rdrrules_sz); 5344 retry_roundrobin: 5345 /* TRACE (iph,msk,rmsk,hv,softn->ipf_nat_rdrrules_sz) */ 5346 for (np = softn->ipf_nat_rdr_rules[hv]; np; np = npnext) { 5347 npnext = np->in_rnext; 5348 if (np->in_ifps[0] && (np->in_ifps[0] != ifp)) 5349 continue; 5350 if (np->in_v[0] != 4) 5351 continue; 5352 if (np->in_pr[0] && (np->in_pr[0] != fin->fin_p)) 5353 continue; 5354 if ((np->in_flags & IPN_RF) && !(np->in_flags & nflags)) 5355 continue; 5356 if (np->in_flags & IPN_FILTER) { 5357 switch (ipf_nat_match(fin, np)) 5358 { 5359 case 0 : 5360 continue; 5361 case -1 : 5362 rval = -1; 5363 goto inmatchfail; 5364 case 1 : 5365 default : 5366 break; 5367 } 5368 } else { 5369 if ((in.s_addr & np->in_odstmsk) != 5370 np->in_odstaddr) 5371 continue; 5372 if (np->in_odport && 5373 ((np->in_dtop < dport) || 5374 (dport < np->in_odport))) 5375 continue; 5376 } 5377 5378 if (np->in_plabel != -1) { 5379 if (!ipf_proxy_ok(fin, tcp, np)) { 5380 continue; 5381 } 5382 } 5383 5384 if (np->in_flags & IPN_NO) { 5385 np->in_hits++; 5386 break; 5387 } 5388 5389 MUTEX_ENTER(&softn->ipf_nat_new); 5390 /* 5391 * If we've matched a round-robin rule but it has 5392 * moved in the list since we got it, start over as 5393 * this is now no longer correct. 5394 */ 5395 if (npnext != np->in_rnext) { 5396 if ((np->in_flags & IPN_ROUNDR) != 0) { 5397 MUTEX_EXIT(&softn->ipf_nat_new); 5398 goto retry_roundrobin; 5399 } 5400 npnext = np->in_rnext; 5401 } 5402 5403 nat = ipf_nat_add(fin, np, NULL, nflags, NAT_INBOUND); 5404 MUTEX_EXIT(&softn->ipf_nat_new); 5405 if (nat != NULL) { 5406 natfailed = 0; 5407 break; 5408 } 5409 natfailed = -1; 5410 } 5411 if ((np == NULL) && (rmsk < softn->ipf_nat_rdr_max)) { 5412 rmsk++; 5413 goto maskloop; 5414 } 5415 } 5416 5417 if (nat != NULL) { 5418 rval = ipf_nat_in(fin, nat, natadd, nflags); 5419 if (rval == 1) { 5420 MUTEX_ENTER(&nat->nat_lock); 5421 ipf_nat_update(fin, nat); 5422 nat->nat_bytes[0] += fin->fin_plen; 5423 nat->nat_pkts[0]++; 5424 fin->fin_pktnum = nat->nat_pkts[0]; 5425 MUTEX_EXIT(&nat->nat_lock); 5426 } 5427 } else 5428 rval = natfailed; 5429 inmatchfail: 5430 RWLOCK_EXIT(&softc->ipf_nat); 5431 5432 switch (rval) 5433 { 5434 case -1 : 5435 if (passp != NULL) { 5436 DT1(frb_natv4in, fr_info_t *, fin); 5437 NBUMPSIDED(0, ns_drop); 5438 *passp = FR_BLOCK; 5439 fin->fin_reason = FRB_NATV4; 5440 } 5441 fin->fin_flx |= FI_BADNAT; 5442 NBUMPSIDED(0, ns_badnat); 5443 break; 5444 case 0 : 5445 NBUMPSIDE(0, ns_ignored); 5446 break; 5447 case 1 : 5448 NBUMPSIDE(0, ns_translated); 5449 break; 5450 } 5451 return rval; 5452 } 5453 5454 5455 /* ------------------------------------------------------------------------ */ 5456 /* Function: ipf_nat_in */ 5457 /* Returns: int - -1 == packet failed NAT checks so block it, */ 5458 /* 1 == packet was successfully translated. */ 5459 /* Parameters: fin(I) - pointer to packet information */ 5460 /* nat(I) - pointer to NAT structure */ 5461 /* natadd(I) - flag indicating if it is safe to add frag cache */ 5462 /* nflags(I) - NAT flags set for this packet */ 5463 /* Locks Held: ipf_nat(READ) */ 5464 /* */ 5465 /* Translate a packet coming "in" on an interface. */ 5466 /* ------------------------------------------------------------------------ */ 5467 int 5468 ipf_nat_in(fr_info_t *fin, nat_t *nat, int natadd, u_32_t nflags) 5469 { 5470 ipf_main_softc_t *softc = fin->fin_main_soft; 5471 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5472 u_32_t sumd, ipsumd, sum1, sum2; 5473 icmphdr_t *icmp; 5474 tcphdr_t *tcp; 5475 ipnat_t *np; 5476 int skip; 5477 int i; 5478 5479 tcp = NULL; 5480 np = nat->nat_ptr; 5481 fin->fin_fr = nat->nat_fr; 5482 5483 if (np != NULL) { 5484 if ((natadd != 0) && (fin->fin_flx & FI_FRAG)) 5485 (void) ipf_frag_natnew(softc, fin, 0, nat); 5486 5487 /* ------------------------------------------------------------- */ 5488 /* A few quick notes: */ 5489 /* Following are test conditions prior to calling the */ 5490 /* ipf_proxy_check routine. */ 5491 /* */ 5492 /* A NULL tcp indicates a non TCP/UDP packet. When dealing */ 5493 /* with a map rule, we attempt to match the packet's */ 5494 /* source port against in_dport, otherwise we'd compare the */ 5495 /* packet's destination. */ 5496 /* ------------------------------------------------------------- */ 5497 if (np->in_apr != NULL) { 5498 i = ipf_proxy_check(fin, nat); 5499 if (i == -1) { 5500 NBUMPSIDED(0, ns_ipf_proxy_fail); 5501 return -1; 5502 } 5503 } 5504 } 5505 5506 ipf_sync_update(softc, SMC_NAT, fin, nat->nat_sync); 5507 5508 ipsumd = nat->nat_ipsumd; 5509 /* 5510 * Fix up checksums, not by recalculating them, but 5511 * simply computing adjustments. 5512 * Why only do this for some platforms on inbound packets ? 5513 * Because for those that it is done, IP processing is yet to happen 5514 * and so the IPv4 header checksum has not yet been evaluated. 5515 * Perhaps it should always be done for the benefit of things like 5516 * fast forwarding (so that it doesn't need to be recomputed) but with 5517 * header checksum offloading, perhaps it is a moot point. 5518 */ 5519 5520 switch (nat->nat_dir) 5521 { 5522 case NAT_INBOUND : 5523 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5524 fin->fin_ip->ip_src = nat->nat_nsrcip; 5525 fin->fin_saddr = nat->nat_nsrcaddr; 5526 } else { 5527 sum1 = nat->nat_osrcaddr; 5528 sum2 = nat->nat_nsrcaddr; 5529 CALC_SUMD(sum1, sum2, sumd); 5530 ipsumd -= sumd; 5531 } 5532 fin->fin_ip->ip_dst = nat->nat_ndstip; 5533 fin->fin_daddr = nat->nat_ndstaddr; 5534 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5535 defined(__osf__) || defined(linux) 5536 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5537 #endif 5538 break; 5539 5540 case NAT_OUTBOUND : 5541 if ((fin->fin_flx & FI_ICMPERR) == 0) { 5542 fin->fin_ip->ip_src = nat->nat_odstip; 5543 fin->fin_saddr = nat->nat_odstaddr; 5544 } else { 5545 sum1 = nat->nat_odstaddr; 5546 sum2 = nat->nat_ndstaddr; 5547 CALC_SUMD(sum1, sum2, sumd); 5548 ipsumd -= sumd; 5549 } 5550 fin->fin_ip->ip_dst = nat->nat_osrcip; 5551 fin->fin_daddr = nat->nat_osrcaddr; 5552 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5553 defined(__osf__) || defined(linux) 5554 ipf_fix_incksum(0, &fin->fin_ip->ip_sum, ipsumd, 0); 5555 #endif 5556 break; 5557 5558 case NAT_DIVERTIN : 5559 { 5560 udphdr_t *uh; 5561 ip_t *ip; 5562 mb_t *m; 5563 5564 m = M_DUP(np->in_divmp); 5565 if (m == NULL) { 5566 NBUMPSIDED(0, ns_divert_dup); 5567 return -1; 5568 } 5569 5570 ip = MTOD(m, ip_t *); 5571 ip->ip_id = htons(ipf_nextipid(fin)); 5572 sum1 = ntohs(ip->ip_len); 5573 ip->ip_len = ntohs(ip->ip_len); 5574 ip->ip_len += fin->fin_plen; 5575 ip->ip_len = htons(ip->ip_len); 5576 5577 uh = (udphdr_t *)(ip + 1); 5578 uh->uh_ulen += fin->fin_plen; 5579 uh->uh_ulen = htons(uh->uh_ulen); 5580 5581 sum2 = ntohs(ip->ip_id) + ntohs(ip->ip_len); 5582 sum2 += ntohs(ip->ip_off) & IP_DF; 5583 CALC_SUMD(sum1, sum2, sumd); 5584 5585 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 5586 defined(__osf__) || defined(linux) 5587 ipf_fix_outcksum(0, &ip->ip_sum, sumd, 0); 5588 #endif 5589 PREP_MB_T(fin, m); 5590 5591 fin->fin_ip = ip; 5592 fin->fin_plen += sizeof(ip_t) + 8; /* UDP + new IPv4 hdr */ 5593 fin->fin_dlen += sizeof(ip_t) + 8; /* UDP + old IPv4 hdr */ 5594 5595 nflags &= ~IPN_TCPUDPICMP; 5596 5597 break; 5598 } 5599 5600 case NAT_DIVERTOUT : 5601 { 5602 mb_t *m; 5603 5604 skip = ipf_nat_decap(fin, nat); 5605 if (skip <= 0) { 5606 NBUMPSIDED(0, ns_decap_fail); 5607 return -1; 5608 } 5609 5610 m = fin->fin_m; 5611 5612 #if defined(MENTAT) && defined(_KERNEL) 5613 m->b_rptr += skip; 5614 #else 5615 m->m_data += skip; 5616 m->m_len -= skip; 5617 5618 # ifdef M_PKTHDR 5619 if (m->m_flags & M_PKTHDR) 5620 m->m_pkthdr.len -= skip; 5621 # endif 5622 #endif 5623 5624 ipf_nat_update(fin, nat); 5625 nflags &= ~IPN_TCPUDPICMP; 5626 fin->fin_flx |= FI_NATED; 5627 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5628 fin->fin_nattag = &np->in_tag; 5629 return 1; 5630 /* NOTREACHED */ 5631 } 5632 } 5633 if (nflags & IPN_TCPUDP) 5634 tcp = fin->fin_dp; 5635 5636 if (!(fin->fin_flx & FI_SHORT) && (fin->fin_off == 0)) { 5637 u_short *csump; 5638 5639 if ((nat->nat_odport != 0) && (nflags & IPN_TCPUDP)) { 5640 switch (nat->nat_dir) 5641 { 5642 case NAT_INBOUND : 5643 tcp->th_sport = nat->nat_nsport; 5644 fin->fin_data[0] = ntohs(nat->nat_nsport); 5645 tcp->th_dport = nat->nat_ndport; 5646 fin->fin_data[1] = ntohs(nat->nat_ndport); 5647 break; 5648 5649 case NAT_OUTBOUND : 5650 tcp->th_sport = nat->nat_odport; 5651 fin->fin_data[0] = ntohs(nat->nat_odport); 5652 tcp->th_dport = nat->nat_osport; 5653 fin->fin_data[1] = ntohs(nat->nat_osport); 5654 break; 5655 } 5656 } 5657 5658 5659 if ((nat->nat_oicmpid != 0) && (nflags & IPN_ICMPQUERY)) { 5660 icmp = fin->fin_dp; 5661 5662 switch (nat->nat_dir) 5663 { 5664 case NAT_INBOUND : 5665 icmp->icmp_id = nat->nat_nicmpid; 5666 break; 5667 case NAT_OUTBOUND : 5668 icmp->icmp_id = nat->nat_oicmpid; 5669 break; 5670 } 5671 } 5672 5673 csump = ipf_nat_proto(fin, nat, nflags); 5674 5675 /* 5676 * The above comments do not hold for layer 4 (or higher) 5677 * checksums... 5678 */ 5679 if (csump != NULL) { 5680 if (nat->nat_dir == NAT_OUTBOUND) 5681 ipf_fix_incksum(0, csump, nat->nat_sumd[0], 0); 5682 else 5683 ipf_fix_outcksum(0, csump, nat->nat_sumd[0], 0); 5684 } 5685 } 5686 5687 fin->fin_flx |= FI_NATED; 5688 if (np != NULL && np->in_tag.ipt_num[0] != 0) 5689 fin->fin_nattag = &np->in_tag; 5690 return 1; 5691 } 5692 5693 5694 /* ------------------------------------------------------------------------ */ 5695 /* Function: ipf_nat_proto */ 5696 /* Returns: u_short* - pointer to transport header checksum to update, */ 5697 /* NULL if the transport protocol is not recognised */ 5698 /* as needing a checksum update. */ 5699 /* Parameters: fin(I) - pointer to packet information */ 5700 /* nat(I) - pointer to NAT structure */ 5701 /* nflags(I) - NAT flags set for this packet */ 5702 /* */ 5703 /* Return the pointer to the checksum field for each protocol so understood.*/ 5704 /* If support for making other changes to a protocol header is required, */ 5705 /* that is not strictly 'address' translation, such as clamping the MSS in */ 5706 /* TCP down to a specific value, then do it from here. */ 5707 /* ------------------------------------------------------------------------ */ 5708 u_short * 5709 ipf_nat_proto(fr_info_t *fin, nat_t *nat, u_int nflags) 5710 { 5711 icmphdr_t *icmp; 5712 u_short *csump; 5713 tcphdr_t *tcp; 5714 udphdr_t *udp; 5715 5716 csump = NULL; 5717 if (fin->fin_out == 0) { 5718 fin->fin_rev = (nat->nat_dir & NAT_OUTBOUND); 5719 } else { 5720 fin->fin_rev = ((nat->nat_dir & NAT_OUTBOUND) == 0); 5721 } 5722 5723 switch (fin->fin_p) 5724 { 5725 case IPPROTO_TCP : 5726 tcp = fin->fin_dp; 5727 5728 if ((nflags & IPN_TCP) != 0) 5729 csump = &tcp->th_sum; 5730 5731 /* 5732 * Do a MSS CLAMPING on a SYN packet, 5733 * only deal IPv4 for now. 5734 */ 5735 if ((nat->nat_mssclamp != 0) && (tcp->th_flags & TH_SYN) != 0) 5736 ipf_nat_mssclamp(tcp, nat->nat_mssclamp, fin, csump); 5737 5738 break; 5739 5740 case IPPROTO_UDP : 5741 udp = fin->fin_dp; 5742 5743 if ((nflags & IPN_UDP) != 0) { 5744 if (udp->uh_sum != 0) 5745 csump = &udp->uh_sum; 5746 } 5747 break; 5748 5749 case IPPROTO_ICMP : 5750 icmp = fin->fin_dp; 5751 5752 if ((nflags & IPN_ICMPQUERY) != 0) { 5753 if (icmp->icmp_cksum != 0) 5754 csump = &icmp->icmp_cksum; 5755 } 5756 break; 5757 5758 #ifdef USE_INET6 5759 case IPPROTO_ICMPV6 : 5760 { 5761 struct icmp6_hdr *icmp6 = (struct icmp6_hdr *)fin->fin_dp; 5762 5763 icmp6 = fin->fin_dp; 5764 5765 if ((nflags & IPN_ICMPQUERY) != 0) { 5766 if (icmp6->icmp6_cksum != 0) 5767 csump = &icmp6->icmp6_cksum; 5768 } 5769 break; 5770 } 5771 #endif 5772 } 5773 return csump; 5774 } 5775 5776 5777 /* ------------------------------------------------------------------------ */ 5778 /* Function: ipf_nat_expire */ 5779 /* Returns: Nil */ 5780 /* Parameters: softc(I) - pointer to soft context main structure */ 5781 /* */ 5782 /* Check all of the timeout queues for entries at the top which need to be */ 5783 /* expired. */ 5784 /* ------------------------------------------------------------------------ */ 5785 void 5786 ipf_nat_expire(ipf_main_softc_t *softc) 5787 { 5788 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5789 ipftq_t *ifq, *ifqnext; 5790 ipftqent_t *tqe, *tqn; 5791 int i; 5792 SPL_INT(s); 5793 5794 SPL_NET(s); 5795 WRITE_ENTER(&softc->ipf_nat); 5796 for (ifq = softn->ipf_nat_tcptq, i = 0; ifq != NULL; 5797 ifq = ifq->ifq_next) { 5798 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5799 if (tqe->tqe_die > softc->ipf_ticks) 5800 break; 5801 tqn = tqe->tqe_next; 5802 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5803 } 5804 } 5805 5806 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifq->ifq_next) { 5807 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); i++) { 5808 if (tqe->tqe_die > softc->ipf_ticks) 5809 break; 5810 tqn = tqe->tqe_next; 5811 ipf_nat_delete(softc, tqe->tqe_parent, NL_EXPIRE); 5812 } 5813 } 5814 5815 for (ifq = softn->ipf_nat_utqe; ifq != NULL; ifq = ifqnext) { 5816 ifqnext = ifq->ifq_next; 5817 5818 if (((ifq->ifq_flags & IFQF_DELETE) != 0) && 5819 (ifq->ifq_ref == 0)) { 5820 ipf_freetimeoutqueue(softc, ifq); 5821 } 5822 } 5823 5824 if (softn->ipf_nat_doflush != 0) { 5825 ipf_nat_extraflush(softc, softn, 2); 5826 softn->ipf_nat_doflush = 0; 5827 } 5828 5829 RWLOCK_EXIT(&softc->ipf_nat); 5830 SPL_X(s); 5831 } 5832 5833 5834 /* ------------------------------------------------------------------------ */ 5835 /* Function: ipf_nat_sync */ 5836 /* Returns: Nil */ 5837 /* Parameters: softc(I) - pointer to soft context main structure */ 5838 /* ifp(I) - pointer to network interface */ 5839 /* */ 5840 /* Walk through all of the currently active NAT sessions, looking for those */ 5841 /* which need to have their translated address updated. */ 5842 /* ------------------------------------------------------------------------ */ 5843 void 5844 ipf_nat_sync(ipf_main_softc_t *softc, void *ifp) 5845 { 5846 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 5847 u_32_t sum1, sum2, sumd; 5848 i6addr_t in; 5849 ipnat_t *n; 5850 nat_t *nat; 5851 void *ifp2; 5852 int idx; 5853 SPL_INT(s); 5854 5855 if (softc->ipf_running <= 0) 5856 return; 5857 5858 /* 5859 * Change IP addresses for NAT sessions for any protocol except TCP 5860 * since it will break the TCP connection anyway. The only rules 5861 * which will get changed are those which are "map ... -> 0/32", 5862 * where the rule specifies the address is taken from the interface. 5863 */ 5864 SPL_NET(s); 5865 WRITE_ENTER(&softc->ipf_nat); 5866 5867 if (softc->ipf_running <= 0) { 5868 RWLOCK_EXIT(&softc->ipf_nat); 5869 return; 5870 } 5871 5872 for (nat = softn->ipf_nat_instances; nat; nat = nat->nat_next) { 5873 if ((nat->nat_flags & IPN_TCP) != 0) 5874 continue; 5875 5876 n = nat->nat_ptr; 5877 if (n != NULL) { 5878 if (n->in_v[1] == 4) { 5879 if (n->in_redir & NAT_MAP) { 5880 if ((n->in_nsrcaddr != 0) || 5881 (n->in_nsrcmsk != 0xffffffff)) 5882 continue; 5883 } else if (n->in_redir & NAT_REDIRECT) { 5884 if ((n->in_ndstaddr != 0) || 5885 (n->in_ndstmsk != 0xffffffff)) 5886 continue; 5887 } 5888 } 5889 #ifdef USE_INET6 5890 if (n->in_v[1] == 4) { 5891 if (n->in_redir & NAT_MAP) { 5892 if (!IP6_ISZERO(&n->in_nsrcaddr) || 5893 !IP6_ISONES(&n->in_nsrcmsk)) 5894 continue; 5895 } else if (n->in_redir & NAT_REDIRECT) { 5896 if (!IP6_ISZERO(&n->in_ndstaddr) || 5897 !IP6_ISONES(&n->in_ndstmsk)) 5898 continue; 5899 } 5900 } 5901 #endif 5902 } 5903 5904 if (((ifp == NULL) || (ifp == nat->nat_ifps[0]) || 5905 (ifp == nat->nat_ifps[1]))) { 5906 nat->nat_ifps[0] = GETIFP(nat->nat_ifnames[0], 5907 nat->nat_v[0]); 5908 if ((nat->nat_ifps[0] != NULL) && 5909 (nat->nat_ifps[0] != (void *)-1)) { 5910 nat->nat_mtu[0] = GETIFMTU_4(nat->nat_ifps[0]); 5911 } 5912 if (nat->nat_ifnames[1][0] != '\0') { 5913 nat->nat_ifps[1] = GETIFP(nat->nat_ifnames[1], 5914 nat->nat_v[1]); 5915 } else { 5916 nat->nat_ifps[1] = nat->nat_ifps[0]; 5917 } 5918 if ((nat->nat_ifps[1] != NULL) && 5919 (nat->nat_ifps[1] != (void *)-1)) { 5920 nat->nat_mtu[1] = GETIFMTU_4(nat->nat_ifps[1]); 5921 } 5922 ifp2 = nat->nat_ifps[0]; 5923 if (ifp2 == NULL) 5924 continue; 5925 5926 /* 5927 * Change the map-to address to be the same as the 5928 * new one. 5929 */ 5930 sum1 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 5931 if (ipf_ifpaddr(softc, nat->nat_v[0], FRI_NORMAL, ifp2, 5932 &in, NULL) != -1) { 5933 if (nat->nat_v[0] == 4) 5934 nat->nat_nsrcip = in.in4; 5935 } 5936 sum2 = NATFSUM(nat, nat->nat_v[1], nat_nsrc6); 5937 5938 if (sum1 == sum2) 5939 continue; 5940 /* 5941 * Readjust the checksum adjustment to take into 5942 * account the new IP#. 5943 */ 5944 CALC_SUMD(sum1, sum2, sumd); 5945 /* XXX - dont change for TCP when solaris does 5946 * hardware checksumming. 5947 */ 5948 sumd += nat->nat_sumd[0]; 5949 nat->nat_sumd[0] = (sumd & 0xffff) + (sumd >> 16); 5950 nat->nat_sumd[1] = nat->nat_sumd[0]; 5951 } 5952 } 5953 5954 for (n = softn->ipf_nat_list; (n != NULL); n = n->in_next) { 5955 char *base = n->in_names; 5956 5957 if ((ifp == NULL) || (n->in_ifps[0] == ifp)) 5958 n->in_ifps[0] = ipf_resolvenic(softc, 5959 base + n->in_ifnames[0], 5960 n->in_v[0]); 5961 if ((ifp == NULL) || (n->in_ifps[1] == ifp)) 5962 n->in_ifps[1] = ipf_resolvenic(softc, 5963 base + n->in_ifnames[1], 5964 n->in_v[1]); 5965 5966 if (n->in_redir & NAT_REDIRECT) 5967 idx = 1; 5968 else 5969 idx = 0; 5970 5971 if (((ifp == NULL) || (n->in_ifps[idx] == ifp)) && 5972 (n->in_ifps[idx] != NULL && 5973 n->in_ifps[idx] != (void *)-1)) { 5974 5975 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_osrc, 5976 0, n->in_ifps[idx]); 5977 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_odst, 5978 0, n->in_ifps[idx]); 5979 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_nsrc, 5980 0, n->in_ifps[idx]); 5981 ipf_nat_nextaddrinit(softc, n->in_names, &n->in_ndst, 5982 0, n->in_ifps[idx]); 5983 } 5984 } 5985 RWLOCK_EXIT(&softc->ipf_nat); 5986 SPL_X(s); 5987 } 5988 5989 5990 /* ------------------------------------------------------------------------ */ 5991 /* Function: ipf_nat_icmpquerytype */ 5992 /* Returns: int - 1 == success, 0 == failure */ 5993 /* Parameters: icmptype(I) - ICMP type number */ 5994 /* */ 5995 /* Tests to see if the ICMP type number passed is a query/response type or */ 5996 /* not. */ 5997 /* ------------------------------------------------------------------------ */ 5998 static int 5999 ipf_nat_icmpquerytype(int icmptype) 6000 { 6001 6002 /* 6003 * For the ICMP query NAT code, it is essential that both the query 6004 * and the reply match on the NAT rule. Because the NAT structure 6005 * does not keep track of the icmptype, and a single NAT structure 6006 * is used for all icmp types with the same src, dest and id, we 6007 * simply define the replies as queries as well. The funny thing is, 6008 * although it seems silly to call a reply a query, this is exactly 6009 * as it is defined in the IPv4 specification 6010 */ 6011 switch (icmptype) 6012 { 6013 case ICMP_ECHOREPLY: 6014 case ICMP_ECHO: 6015 /* route advertisement/sollicitation is currently unsupported: */ 6016 /* it would require rewriting the ICMP data section */ 6017 case ICMP_TSTAMP: 6018 case ICMP_TSTAMPREPLY: 6019 case ICMP_IREQ: 6020 case ICMP_IREQREPLY: 6021 case ICMP_MASKREQ: 6022 case ICMP_MASKREPLY: 6023 return 1; 6024 default: 6025 return 0; 6026 } 6027 } 6028 6029 6030 /* ------------------------------------------------------------------------ */ 6031 /* Function: nat_log */ 6032 /* Returns: Nil */ 6033 /* Parameters: softc(I) - pointer to soft context main structure */ 6034 /* softn(I) - pointer to NAT context structure */ 6035 /* nat(I) - pointer to NAT structure */ 6036 /* action(I) - action related to NAT structure being performed */ 6037 /* */ 6038 /* Creates a NAT log entry. */ 6039 /* ------------------------------------------------------------------------ */ 6040 void 6041 ipf_nat_log(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, struct nat *nat, 6042 u_int action) 6043 { 6044 #ifdef IPFILTER_LOG 6045 # ifndef LARGE_NAT 6046 struct ipnat *np; 6047 int rulen; 6048 # endif 6049 struct natlog natl; 6050 void *items[1]; 6051 size_t sizes[1]; 6052 int types[1]; 6053 6054 bcopy((char *)&nat->nat_osrc6, (char *)&natl.nl_osrcip, 6055 sizeof(natl.nl_osrcip)); 6056 bcopy((char *)&nat->nat_nsrc6, (char *)&natl.nl_nsrcip, 6057 sizeof(natl.nl_nsrcip)); 6058 bcopy((char *)&nat->nat_odst6, (char *)&natl.nl_odstip, 6059 sizeof(natl.nl_odstip)); 6060 bcopy((char *)&nat->nat_ndst6, (char *)&natl.nl_ndstip, 6061 sizeof(natl.nl_ndstip)); 6062 6063 natl.nl_bytes[0] = nat->nat_bytes[0]; 6064 natl.nl_bytes[1] = nat->nat_bytes[1]; 6065 natl.nl_pkts[0] = nat->nat_pkts[0]; 6066 natl.nl_pkts[1] = nat->nat_pkts[1]; 6067 natl.nl_odstport = nat->nat_odport; 6068 natl.nl_osrcport = nat->nat_osport; 6069 natl.nl_nsrcport = nat->nat_nsport; 6070 natl.nl_ndstport = nat->nat_ndport; 6071 natl.nl_p[0] = nat->nat_pr[0]; 6072 natl.nl_p[1] = nat->nat_pr[1]; 6073 natl.nl_v[0] = nat->nat_v[0]; 6074 natl.nl_v[1] = nat->nat_v[1]; 6075 natl.nl_type = nat->nat_redir; 6076 natl.nl_action = action; 6077 natl.nl_rule = -1; 6078 6079 bcopy(nat->nat_ifnames[0], natl.nl_ifnames[0], 6080 sizeof(nat->nat_ifnames[0])); 6081 bcopy(nat->nat_ifnames[1], natl.nl_ifnames[1], 6082 sizeof(nat->nat_ifnames[1])); 6083 6084 # ifndef LARGE_NAT 6085 if (nat->nat_ptr != NULL) { 6086 for (rulen = 0, np = softn->ipf_nat_list; np != NULL; 6087 np = np->in_next, rulen++) 6088 if (np == nat->nat_ptr) { 6089 natl.nl_rule = rulen; 6090 break; 6091 } 6092 } 6093 # endif 6094 items[0] = &natl; 6095 sizes[0] = sizeof(natl); 6096 types[0] = 0; 6097 6098 (void) ipf_log_items(softc, IPL_LOGNAT, NULL, items, sizes, types, 1); 6099 #endif 6100 } 6101 6102 6103 #if defined(__OpenBSD__) 6104 /* ------------------------------------------------------------------------ */ 6105 /* Function: ipf_nat_ifdetach */ 6106 /* Returns: Nil */ 6107 /* Parameters: ifp(I) - pointer to network interface */ 6108 /* */ 6109 /* Compatibility interface for OpenBSD to trigger the correct updating of */ 6110 /* interface references within IPFilter. */ 6111 /* ------------------------------------------------------------------------ */ 6112 void 6113 ipf_nat_ifdetach(ifp) 6114 void *ifp; 6115 { 6116 ipf_main_softc_t *softc; 6117 6118 softc = ipf_get_softc(0); 6119 6120 ipf_sync(ifp); 6121 return; 6122 } 6123 #endif 6124 6125 6126 /* ------------------------------------------------------------------------ */ 6127 /* Function: ipf_nat_rule_deref */ 6128 /* Returns: Nil */ 6129 /* Parameters: softc(I) - pointer to soft context main structure */ 6130 /* inp(I) - pointer to pointer to NAT rule */ 6131 /* Write Locks: ipf_nat */ 6132 /* */ 6133 /* Dropping the refernce count for a rule means that whatever held the */ 6134 /* pointer to this rule (*inp) is no longer interested in it and when the */ 6135 /* reference count drops to zero, any resources allocated for the rule can */ 6136 /* be released and the rule itself free'd. */ 6137 /* ------------------------------------------------------------------------ */ 6138 void 6139 ipf_nat_rule_deref(ipf_main_softc_t *softc, ipnat_t **inp) 6140 { 6141 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6142 ipnat_t *n; 6143 6144 n = *inp; 6145 *inp = NULL; 6146 n->in_use--; 6147 if (n->in_use > 0) 6148 return; 6149 6150 if (n->in_apr != NULL) 6151 ipf_proxy_deref(n->in_apr); 6152 6153 ipf_nat_rule_fini(softc, n); 6154 6155 if (n->in_redir & NAT_REDIRECT) { 6156 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6157 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_rdr); 6158 } 6159 } 6160 if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) { 6161 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6162 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules_map); 6163 } 6164 } 6165 6166 if (n->in_tqehead[0] != NULL) { 6167 if (ipf_deletetimeoutqueue(n->in_tqehead[0]) == 0) { 6168 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6169 } 6170 } 6171 6172 if (n->in_tqehead[1] != NULL) { 6173 if (ipf_deletetimeoutqueue(n->in_tqehead[1]) == 0) { 6174 ipf_freetimeoutqueue(softc, n->in_tqehead[1]); 6175 } 6176 } 6177 6178 if ((n->in_flags & IPN_PROXYRULE) == 0) { 6179 ATOMIC_DEC32(softn->ipf_nat_stats.ns_rules); 6180 } 6181 6182 MUTEX_DESTROY(&n->in_lock); 6183 6184 KFREES(n, n->in_size); 6185 6186 #if SOLARIS && !defined(INSTANCES) 6187 if (softn->ipf_nat_stats.ns_rules == 0) 6188 pfil_delayed_copy = 1; 6189 #endif 6190 } 6191 6192 6193 /* ------------------------------------------------------------------------ */ 6194 /* Function: ipf_nat_deref */ 6195 /* Returns: Nil */ 6196 /* Parameters: softc(I) - pointer to soft context main structure */ 6197 /* natp(I) - pointer to pointer to NAT table entry */ 6198 /* */ 6199 /* Decrement the reference counter for this NAT table entry and free it if */ 6200 /* there are no more things using it. */ 6201 /* */ 6202 /* IF nat_ref == 1 when this function is called, then we have an orphan nat */ 6203 /* structure *because* it only gets called on paths _after_ nat_ref has been*/ 6204 /* incremented. If nat_ref == 1 then we shouldn't decrement it here */ 6205 /* because nat_delete() will do that and send nat_ref to -1. */ 6206 /* */ 6207 /* Holding the lock on nat_lock is required to serialise nat_delete() being */ 6208 /* called from a NAT flush ioctl with a deref happening because of a packet.*/ 6209 /* ------------------------------------------------------------------------ */ 6210 void 6211 ipf_nat_deref(ipf_main_softc_t *softc, nat_t **natp) 6212 { 6213 nat_t *nat; 6214 6215 nat = *natp; 6216 *natp = NULL; 6217 6218 MUTEX_ENTER(&nat->nat_lock); 6219 if (nat->nat_ref > 1) { 6220 nat->nat_ref--; 6221 ASSERT(nat->nat_ref >= 0); 6222 MUTEX_EXIT(&nat->nat_lock); 6223 return; 6224 } 6225 MUTEX_EXIT(&nat->nat_lock); 6226 6227 WRITE_ENTER(&softc->ipf_nat); 6228 ipf_nat_delete(softc, nat, NL_EXPIRE); 6229 RWLOCK_EXIT(&softc->ipf_nat); 6230 } 6231 6232 6233 /* ------------------------------------------------------------------------ */ 6234 /* Function: ipf_nat_clone */ 6235 /* Returns: ipstate_t* - NULL == cloning failed, */ 6236 /* else pointer to new state structure */ 6237 /* Parameters: fin(I) - pointer to packet information */ 6238 /* is(I) - pointer to master state structure */ 6239 /* Write Lock: ipf_nat */ 6240 /* */ 6241 /* Create a "duplcate" state table entry from the master. */ 6242 /* ------------------------------------------------------------------------ */ 6243 nat_t * 6244 ipf_nat_clone(fr_info_t *fin, nat_t *nat) 6245 { 6246 ipf_main_softc_t *softc = fin->fin_main_soft; 6247 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6248 frentry_t *fr; 6249 nat_t *clone; 6250 ipnat_t *np; 6251 6252 KMALLOC(clone, nat_t *); 6253 if (clone == NULL) { 6254 NBUMPSIDED(fin->fin_out, ns_clone_nomem); 6255 return NULL; 6256 } 6257 bcopy((char *)nat, (char *)clone, sizeof(*clone)); 6258 6259 MUTEX_NUKE(&clone->nat_lock); 6260 6261 clone->nat_rev = fin->fin_rev; 6262 clone->nat_aps = NULL; 6263 /* 6264 * Initialize all these so that ipf_nat_delete() doesn't cause a crash. 6265 */ 6266 clone->nat_tqe.tqe_pnext = NULL; 6267 clone->nat_tqe.tqe_next = NULL; 6268 clone->nat_tqe.tqe_ifq = NULL; 6269 clone->nat_tqe.tqe_parent = clone; 6270 6271 clone->nat_flags &= ~SI_CLONE; 6272 clone->nat_flags |= SI_CLONED; 6273 6274 if (clone->nat_hm) 6275 clone->nat_hm->hm_ref++; 6276 6277 if (ipf_nat_insert(softc, softn, clone) == -1) { 6278 KFREE(clone); 6279 NBUMPSIDED(fin->fin_out, ns_insert_fail); 6280 return NULL; 6281 } 6282 6283 np = clone->nat_ptr; 6284 if (np != NULL) { 6285 if (softn->ipf_nat_logging) 6286 ipf_nat_log(softc, softn, clone, NL_CLONE); 6287 np->in_use++; 6288 } 6289 fr = clone->nat_fr; 6290 if (fr != NULL) { 6291 MUTEX_ENTER(&fr->fr_lock); 6292 fr->fr_ref++; 6293 MUTEX_EXIT(&fr->fr_lock); 6294 } 6295 6296 6297 /* 6298 * Because the clone is created outside the normal loop of things and 6299 * TCP has special needs in terms of state, initialise the timeout 6300 * state of the new NAT from here. 6301 */ 6302 if (clone->nat_pr[0] == IPPROTO_TCP) { 6303 (void) ipf_tcp_age(&clone->nat_tqe, fin, softn->ipf_nat_tcptq, 6304 clone->nat_flags, 2); 6305 } 6306 clone->nat_sync = ipf_sync_new(softc, SMC_NAT, fin, clone); 6307 if (softn->ipf_nat_logging) 6308 ipf_nat_log(softc, softn, clone, NL_CLONE); 6309 return clone; 6310 } 6311 6312 6313 /* ------------------------------------------------------------------------ */ 6314 /* Function: ipf_nat_wildok */ 6315 /* Returns: int - 1 == packet's ports match wildcards */ 6316 /* 0 == packet's ports don't match wildcards */ 6317 /* Parameters: nat(I) - NAT entry */ 6318 /* sport(I) - source port */ 6319 /* dport(I) - destination port */ 6320 /* flags(I) - wildcard flags */ 6321 /* dir(I) - packet direction */ 6322 /* */ 6323 /* Use NAT entry and packet direction to determine which combination of */ 6324 /* wildcard flags should be used. */ 6325 /* ------------------------------------------------------------------------ */ 6326 int 6327 ipf_nat_wildok(nat_t *nat, int sport, int dport, int flags, int dir) 6328 { 6329 /* 6330 * When called by dir is set to 6331 * nat_inlookup NAT_INBOUND (0) 6332 * nat_outlookup NAT_OUTBOUND (1) 6333 * 6334 * We simply combine the packet's direction in dir with the original 6335 * "intended" direction of that NAT entry in nat->nat_dir to decide 6336 * which combination of wildcard flags to allow. 6337 */ 6338 switch ((dir << 1) | (nat->nat_dir & (NAT_INBOUND|NAT_OUTBOUND))) 6339 { 6340 case 3: /* outbound packet / outbound entry */ 6341 if (((nat->nat_osport == sport) || 6342 (flags & SI_W_SPORT)) && 6343 ((nat->nat_odport == dport) || 6344 (flags & SI_W_DPORT))) 6345 return 1; 6346 break; 6347 case 2: /* outbound packet / inbound entry */ 6348 if (((nat->nat_osport == dport) || 6349 (flags & SI_W_SPORT)) && 6350 ((nat->nat_odport == sport) || 6351 (flags & SI_W_DPORT))) 6352 return 1; 6353 break; 6354 case 1: /* inbound packet / outbound entry */ 6355 if (((nat->nat_osport == dport) || 6356 (flags & SI_W_SPORT)) && 6357 ((nat->nat_odport == sport) || 6358 (flags & SI_W_DPORT))) 6359 return 1; 6360 break; 6361 case 0: /* inbound packet / inbound entry */ 6362 if (((nat->nat_osport == sport) || 6363 (flags & SI_W_SPORT)) && 6364 ((nat->nat_odport == dport) || 6365 (flags & SI_W_DPORT))) 6366 return 1; 6367 break; 6368 default: 6369 break; 6370 } 6371 6372 return(0); 6373 } 6374 6375 6376 /* ------------------------------------------------------------------------ */ 6377 /* Function: nat_mssclamp */ 6378 /* Returns: Nil */ 6379 /* Parameters: tcp(I) - pointer to TCP header */ 6380 /* maxmss(I) - value to clamp the TCP MSS to */ 6381 /* fin(I) - pointer to packet information */ 6382 /* csump(I) - pointer to TCP checksum */ 6383 /* */ 6384 /* Check for MSS option and clamp it if necessary. If found and changed, */ 6385 /* then the TCP header checksum will be updated to reflect the change in */ 6386 /* the MSS. */ 6387 /* ------------------------------------------------------------------------ */ 6388 static void 6389 ipf_nat_mssclamp(tcphdr_t *tcp, u_32_t maxmss, fr_info_t *fin, u_short *csump) 6390 { 6391 u_char *cp, *ep, opt; 6392 int hlen, advance; 6393 u_32_t mss, sumd; 6394 6395 hlen = TCP_OFF(tcp) << 2; 6396 if (hlen > sizeof(*tcp)) { 6397 cp = (u_char *)tcp + sizeof(*tcp); 6398 ep = (u_char *)tcp + hlen; 6399 6400 while (cp < ep) { 6401 opt = cp[0]; 6402 if (opt == TCPOPT_EOL) 6403 break; 6404 else if (opt == TCPOPT_NOP) { 6405 cp++; 6406 continue; 6407 } 6408 6409 if (cp + 1 >= ep) 6410 break; 6411 advance = cp[1]; 6412 if ((cp + advance > ep) || (advance <= 0)) 6413 break; 6414 switch (opt) 6415 { 6416 case TCPOPT_MAXSEG: 6417 if (advance != 4) 6418 break; 6419 mss = cp[2] * 256 + cp[3]; 6420 if (mss > maxmss) { 6421 cp[2] = maxmss / 256; 6422 cp[3] = maxmss & 0xff; 6423 CALC_SUMD(mss, maxmss, sumd); 6424 ipf_fix_outcksum(0, csump, sumd, 0); 6425 } 6426 break; 6427 default: 6428 /* ignore unknown options */ 6429 break; 6430 } 6431 6432 cp += advance; 6433 } 6434 } 6435 } 6436 6437 6438 /* ------------------------------------------------------------------------ */ 6439 /* Function: ipf_nat_setqueue */ 6440 /* Returns: Nil */ 6441 /* Parameters: softc(I) - pointer to soft context main structure */ 6442 /* softn(I) - pointer to NAT context structure */ 6443 /* nat(I)- pointer to NAT structure */ 6444 /* Locks: ipf_nat (read or write) */ 6445 /* */ 6446 /* Put the NAT entry on its default queue entry, using rev as a helped in */ 6447 /* determining which queue it should be placed on. */ 6448 /* ------------------------------------------------------------------------ */ 6449 void 6450 ipf_nat_setqueue(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, nat_t *nat) 6451 { 6452 ipftq_t *oifq, *nifq; 6453 int rev = nat->nat_rev; 6454 6455 if (nat->nat_ptr != NULL) 6456 nifq = nat->nat_ptr->in_tqehead[rev]; 6457 else 6458 nifq = NULL; 6459 6460 if (nifq == NULL) { 6461 switch (nat->nat_pr[0]) 6462 { 6463 case IPPROTO_UDP : 6464 nifq = &softn->ipf_nat_udptq; 6465 break; 6466 case IPPROTO_ICMP : 6467 nifq = &softn->ipf_nat_icmptq; 6468 break; 6469 case IPPROTO_TCP : 6470 nifq = softn->ipf_nat_tcptq + 6471 nat->nat_tqe.tqe_state[rev]; 6472 break; 6473 default : 6474 nifq = &softn->ipf_nat_iptq; 6475 break; 6476 } 6477 } 6478 6479 oifq = nat->nat_tqe.tqe_ifq; 6480 /* 6481 * If it's currently on a timeout queue, move it from one queue to 6482 * another, else put it on the end of the newly determined queue. 6483 */ 6484 if (oifq != NULL) 6485 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, nifq); 6486 else 6487 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, nifq, nat); 6488 return; 6489 } 6490 6491 6492 /* ------------------------------------------------------------------------ */ 6493 /* Function: nat_getnext */ 6494 /* Returns: int - 0 == ok, else error */ 6495 /* Parameters: softc(I) - pointer to soft context main structure */ 6496 /* t(I) - pointer to ipftoken structure */ 6497 /* itp(I) - pointer to ipfgeniter_t structure */ 6498 /* */ 6499 /* Fetch the next nat/ipnat structure pointer from the linked list and */ 6500 /* copy it out to the storage space pointed to by itp_data. The next item */ 6501 /* in the list to look at is put back in the ipftoken struture. */ 6502 /* ------------------------------------------------------------------------ */ 6503 static int 6504 ipf_nat_getnext(ipf_main_softc_t *softc, ipftoken_t *t, ipfgeniter_t *itp, 6505 ipfobj_t *objp) 6506 { 6507 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6508 hostmap_t *hm, *nexthm = NULL, zerohm; 6509 ipnat_t *ipn, *nextipnat = NULL, zeroipn; 6510 nat_t *nat, *nextnat = NULL, zeronat; 6511 int error = 0; 6512 void *nnext; 6513 6514 if (itp->igi_nitems != 1) { 6515 IPFERROR(60075); 6516 return ENOSPC; 6517 } 6518 6519 READ_ENTER(&softc->ipf_nat); 6520 6521 switch (itp->igi_type) 6522 { 6523 case IPFGENITER_HOSTMAP : 6524 hm = t->ipt_data; 6525 if (hm == NULL) { 6526 nexthm = softn->ipf_hm_maplist; 6527 } else { 6528 nexthm = hm->hm_next; 6529 } 6530 if (nexthm != NULL) { 6531 ATOMIC_INC32(nexthm->hm_ref); 6532 t->ipt_data = nexthm; 6533 } else { 6534 bzero(&zerohm, sizeof(zerohm)); 6535 nexthm = &zerohm; 6536 t->ipt_data = NULL; 6537 } 6538 nnext = nexthm->hm_next; 6539 break; 6540 6541 case IPFGENITER_IPNAT : 6542 ipn = t->ipt_data; 6543 if (ipn == NULL) { 6544 nextipnat = softn->ipf_nat_list; 6545 } else { 6546 nextipnat = ipn->in_next; 6547 } 6548 if (nextipnat != NULL) { 6549 ATOMIC_INC32(nextipnat->in_use); 6550 t->ipt_data = nextipnat; 6551 } else { 6552 bzero(&zeroipn, sizeof(zeroipn)); 6553 nextipnat = &zeroipn; 6554 t->ipt_data = NULL; 6555 } 6556 nnext = nextipnat->in_next; 6557 break; 6558 6559 case IPFGENITER_NAT : 6560 nat = t->ipt_data; 6561 if (nat == NULL) { 6562 nextnat = softn->ipf_nat_instances; 6563 } else { 6564 nextnat = nat->nat_next; 6565 } 6566 if (nextnat != NULL) { 6567 MUTEX_ENTER(&nextnat->nat_lock); 6568 nextnat->nat_ref++; 6569 MUTEX_EXIT(&nextnat->nat_lock); 6570 t->ipt_data = nextnat; 6571 } else { 6572 bzero(&zeronat, sizeof(zeronat)); 6573 nextnat = &zeronat; 6574 t->ipt_data = NULL; 6575 } 6576 nnext = nextnat->nat_next; 6577 break; 6578 6579 default : 6580 RWLOCK_EXIT(&softc->ipf_nat); 6581 IPFERROR(60055); 6582 return EINVAL; 6583 } 6584 6585 RWLOCK_EXIT(&softc->ipf_nat); 6586 6587 objp->ipfo_ptr = itp->igi_data; 6588 6589 switch (itp->igi_type) 6590 { 6591 case IPFGENITER_HOSTMAP : 6592 error = COPYOUT(nexthm, objp->ipfo_ptr, sizeof(*nexthm)); 6593 if (error != 0) { 6594 IPFERROR(60049); 6595 error = EFAULT; 6596 } 6597 if (hm != NULL) { 6598 WRITE_ENTER(&softc->ipf_nat); 6599 ipf_nat_hostmapdel(softc, &hm); 6600 RWLOCK_EXIT(&softc->ipf_nat); 6601 } 6602 break; 6603 6604 case IPFGENITER_IPNAT : 6605 objp->ipfo_size = nextipnat->in_size; 6606 objp->ipfo_type = IPFOBJ_IPNAT; 6607 error = ipf_outobjk(softc, objp, nextipnat); 6608 if (ipn != NULL) { 6609 WRITE_ENTER(&softc->ipf_nat); 6610 ipf_nat_rule_deref(softc, &ipn); 6611 RWLOCK_EXIT(&softc->ipf_nat); 6612 } 6613 break; 6614 6615 case IPFGENITER_NAT : 6616 objp->ipfo_size = sizeof(nat_t); 6617 objp->ipfo_type = IPFOBJ_NAT; 6618 error = ipf_outobjk(softc, objp, nextnat); 6619 if (nat != NULL) 6620 ipf_nat_deref(softc, &nat); 6621 6622 break; 6623 } 6624 6625 if (nnext == NULL) 6626 ipf_token_mark_complete(t); 6627 6628 return error; 6629 } 6630 6631 6632 /* ------------------------------------------------------------------------ */ 6633 /* Function: nat_extraflush */ 6634 /* Returns: int - 0 == success, -1 == failure */ 6635 /* Parameters: softc(I) - pointer to soft context main structure */ 6636 /* softn(I) - pointer to NAT context structure */ 6637 /* which(I) - how to flush the active NAT table */ 6638 /* Write Locks: ipf_nat */ 6639 /* */ 6640 /* Flush nat tables. Three actions currently defined: */ 6641 /* which == 0 : flush all nat table entries */ 6642 /* which == 1 : flush TCP connections which have started to close but are */ 6643 /* stuck for some reason. */ 6644 /* which == 2 : flush TCP connections which have been idle for a long time, */ 6645 /* starting at > 4 days idle and working back in successive half-*/ 6646 /* days to at most 12 hours old. If this fails to free enough */ 6647 /* slots then work backwards in half hour slots to 30 minutes. */ 6648 /* If that too fails, then work backwards in 30 second intervals */ 6649 /* for the last 30 minutes to at worst 30 seconds idle. */ 6650 /* ------------------------------------------------------------------------ */ 6651 static int 6652 ipf_nat_extraflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, int which) 6653 { 6654 nat_t *nat, **natp; 6655 ipftqent_t *tqn; 6656 ipftq_t *ifq; 6657 int removed; 6658 SPL_INT(s); 6659 6660 removed = 0; 6661 6662 SPL_NET(s); 6663 switch (which) 6664 { 6665 case 0 : 6666 softn->ipf_nat_stats.ns_flush_all++; 6667 /* 6668 * Style 0 flush removes everything... 6669 */ 6670 for (natp = &softn->ipf_nat_instances; 6671 ((nat = *natp) != NULL); ) { 6672 ipf_nat_delete(softc, nat, NL_FLUSH); 6673 removed++; 6674 } 6675 break; 6676 6677 case 1 : 6678 softn->ipf_nat_stats.ns_flush_closing++; 6679 /* 6680 * Since we're only interested in things that are closing, 6681 * we can start with the appropriate timeout queue. 6682 */ 6683 for (ifq = softn->ipf_nat_tcptq + IPF_TCPS_CLOSE_WAIT; 6684 ifq != NULL; ifq = ifq->ifq_next) { 6685 6686 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6687 nat = tqn->tqe_parent; 6688 tqn = tqn->tqe_next; 6689 if (nat->nat_pr[0] != IPPROTO_TCP || 6690 nat->nat_pr[1] != IPPROTO_TCP) 6691 break; 6692 ipf_nat_delete(softc, nat, NL_EXPIRE); 6693 removed++; 6694 } 6695 } 6696 6697 /* 6698 * Also need to look through the user defined queues. 6699 */ 6700 for (ifq = softn->ipf_nat_utqe; ifq != NULL; 6701 ifq = ifq->ifq_next) { 6702 for (tqn = ifq->ifq_head; tqn != NULL; ) { 6703 nat = tqn->tqe_parent; 6704 tqn = tqn->tqe_next; 6705 if (nat->nat_pr[0] != IPPROTO_TCP || 6706 nat->nat_pr[1] != IPPROTO_TCP) 6707 continue; 6708 6709 if ((nat->nat_tcpstate[0] > 6710 IPF_TCPS_ESTABLISHED) && 6711 (nat->nat_tcpstate[1] > 6712 IPF_TCPS_ESTABLISHED)) { 6713 ipf_nat_delete(softc, nat, NL_EXPIRE); 6714 removed++; 6715 } 6716 } 6717 } 6718 break; 6719 6720 /* 6721 * Args 5-11 correspond to flushing those particular states 6722 * for TCP connections. 6723 */ 6724 case IPF_TCPS_CLOSE_WAIT : 6725 case IPF_TCPS_FIN_WAIT_1 : 6726 case IPF_TCPS_CLOSING : 6727 case IPF_TCPS_LAST_ACK : 6728 case IPF_TCPS_FIN_WAIT_2 : 6729 case IPF_TCPS_TIME_WAIT : 6730 case IPF_TCPS_CLOSED : 6731 softn->ipf_nat_stats.ns_flush_state++; 6732 tqn = softn->ipf_nat_tcptq[which].ifq_head; 6733 while (tqn != NULL) { 6734 nat = tqn->tqe_parent; 6735 tqn = tqn->tqe_next; 6736 ipf_nat_delete(softc, nat, NL_FLUSH); 6737 removed++; 6738 } 6739 break; 6740 6741 default : 6742 if (which < 30) 6743 break; 6744 6745 softn->ipf_nat_stats.ns_flush_timeout++; 6746 /* 6747 * Take a large arbitrary number to mean the number of seconds 6748 * for which which consider to be the maximum value we'll allow 6749 * the expiration to be. 6750 */ 6751 which = IPF_TTLVAL(which); 6752 for (natp = &softn->ipf_nat_instances; 6753 ((nat = *natp) != NULL); ) { 6754 if (softc->ipf_ticks - nat->nat_touched > which) { 6755 ipf_nat_delete(softc, nat, NL_FLUSH); 6756 removed++; 6757 } else 6758 natp = &nat->nat_next; 6759 } 6760 break; 6761 } 6762 6763 if (which != 2) { 6764 SPL_X(s); 6765 return removed; 6766 } 6767 6768 softn->ipf_nat_stats.ns_flush_queue++; 6769 6770 /* 6771 * Asked to remove inactive entries because the table is full, try 6772 * again, 3 times, if first attempt failed with a different criteria 6773 * each time. The order tried in must be in decreasing age. 6774 * Another alternative is to implement random drop and drop N entries 6775 * at random until N have been freed up. 6776 */ 6777 if (softc->ipf_ticks - softn->ipf_nat_last_force_flush > 6778 IPF_TTLVAL(5)) { 6779 softn->ipf_nat_last_force_flush = softc->ipf_ticks; 6780 6781 removed = ipf_queueflush(softc, ipf_nat_flush_entry, 6782 softn->ipf_nat_tcptq, 6783 softn->ipf_nat_utqe, 6784 &softn->ipf_nat_stats.ns_active, 6785 softn->ipf_nat_table_sz, 6786 softn->ipf_nat_table_wm_low); 6787 } 6788 6789 SPL_X(s); 6790 return removed; 6791 } 6792 6793 6794 /* ------------------------------------------------------------------------ */ 6795 /* Function: ipf_nat_flush_entry */ 6796 /* Returns: 0 - always succeeds */ 6797 /* Parameters: softc(I) - pointer to soft context main structure */ 6798 /* entry(I) - pointer to NAT entry */ 6799 /* Write Locks: ipf_nat */ 6800 /* */ 6801 /* This function is a stepping stone between ipf_queueflush() and */ 6802 /* nat_dlete(). It is used so we can provide a uniform interface via the */ 6803 /* ipf_queueflush() function. Since the nat_delete() function returns void */ 6804 /* we translate that to mean it always succeeds in deleting something. */ 6805 /* ------------------------------------------------------------------------ */ 6806 static int 6807 ipf_nat_flush_entry(ipf_main_softc_t *softc, void *entry) 6808 { 6809 ipf_nat_delete(softc, entry, NL_FLUSH); 6810 return 0; 6811 } 6812 6813 6814 /* ------------------------------------------------------------------------ */ 6815 /* Function: ipf_nat_iterator */ 6816 /* Returns: int - 0 == ok, else error */ 6817 /* Parameters: softc(I) - pointer to soft context main structure */ 6818 /* token(I) - pointer to ipftoken structure */ 6819 /* itp(I) - pointer to ipfgeniter_t structure */ 6820 /* obj(I) - pointer to data description structure */ 6821 /* */ 6822 /* This function acts as a handler for the SIOCGENITER ioctls that use a */ 6823 /* generic structure to iterate through a list. There are three different */ 6824 /* linked lists of NAT related information to go through: NAT rules, active */ 6825 /* NAT mappings and the NAT fragment cache. */ 6826 /* ------------------------------------------------------------------------ */ 6827 static int 6828 ipf_nat_iterator(ipf_main_softc_t *softc, ipftoken_t *token, ipfgeniter_t *itp, 6829 ipfobj_t *obj) 6830 { 6831 int error; 6832 6833 if (itp->igi_data == NULL) { 6834 IPFERROR(60052); 6835 return EFAULT; 6836 } 6837 6838 switch (itp->igi_type) 6839 { 6840 case IPFGENITER_HOSTMAP : 6841 case IPFGENITER_IPNAT : 6842 case IPFGENITER_NAT : 6843 error = ipf_nat_getnext(softc, token, itp, obj); 6844 break; 6845 6846 case IPFGENITER_NATFRAG : 6847 error = ipf_frag_nat_next(softc, token, itp); 6848 break; 6849 default : 6850 IPFERROR(60053); 6851 error = EINVAL; 6852 break; 6853 } 6854 6855 return error; 6856 } 6857 6858 6859 /* ------------------------------------------------------------------------ */ 6860 /* Function: ipf_nat_setpending */ 6861 /* Returns: Nil */ 6862 /* Parameters: softc(I) - pointer to soft context main structure */ 6863 /* nat(I) - pointer to NAT structure */ 6864 /* Locks: ipf_nat (read or write) */ 6865 /* */ 6866 /* Put the NAT entry on to the pending queue - this queue has a very short */ 6867 /* lifetime where items are put that can't be deleted straight away because */ 6868 /* of locking issues but we want to delete them ASAP, anyway. In calling */ 6869 /* this function, it is assumed that the owner (if there is one, as shown */ 6870 /* by nat_me) is no longer interested in it. */ 6871 /* ------------------------------------------------------------------------ */ 6872 void 6873 ipf_nat_setpending(ipf_main_softc_t *softc, nat_t *nat) 6874 { 6875 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 6876 ipftq_t *oifq; 6877 6878 oifq = nat->nat_tqe.tqe_ifq; 6879 if (oifq != NULL) 6880 ipf_movequeue(softc->ipf_ticks, &nat->nat_tqe, oifq, 6881 &softn->ipf_nat_pending); 6882 else 6883 ipf_queueappend(softc->ipf_ticks, &nat->nat_tqe, 6884 &softn->ipf_nat_pending, nat); 6885 6886 if (nat->nat_me != NULL) { 6887 *nat->nat_me = NULL; 6888 nat->nat_me = NULL; 6889 nat->nat_ref--; 6890 ASSERT(nat->nat_ref >= 0); 6891 } 6892 } 6893 6894 6895 /* ------------------------------------------------------------------------ */ 6896 /* Function: nat_newrewrite */ 6897 /* Returns: int - -1 == error, 0 == success (no move), 1 == success and */ 6898 /* allow rule to be moved if IPN_ROUNDR is set. */ 6899 /* Parameters: fin(I) - pointer to packet information */ 6900 /* nat(I) - pointer to NAT entry */ 6901 /* ni(I) - pointer to structure with misc. information needed */ 6902 /* to create new NAT entry. */ 6903 /* Write Lock: ipf_nat */ 6904 /* */ 6905 /* This function is responsible for setting up an active NAT session where */ 6906 /* we are changing both the source and destination parameters at the same */ 6907 /* time. The loop in here works differently to elsewhere - each iteration */ 6908 /* is responsible for changing a single parameter that can be incremented. */ 6909 /* So one pass may increase the source IP#, next source port, next dest. IP#*/ 6910 /* and the last destination port for a total of 4 iterations to try each. */ 6911 /* This is done to try and exhaustively use the translation space available.*/ 6912 /* ------------------------------------------------------------------------ */ 6913 static int 6914 ipf_nat_newrewrite(fr_info_t *fin, nat_t *nat, natinfo_t *nai) 6915 { 6916 int src_search = 1; 6917 int dst_search = 1; 6918 fr_info_t frnat; 6919 u_32_t flags; 6920 u_short swap; 6921 ipnat_t *np; 6922 nat_t *natl; 6923 int l = 0; 6924 int changed; 6925 6926 natl = NULL; 6927 changed = -1; 6928 np = nai->nai_np; 6929 flags = nat->nat_flags; 6930 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 6931 6932 nat->nat_hm = NULL; 6933 6934 do { 6935 changed = -1; 6936 /* TRACE (l, src_search, dst_search, np) */ 6937 6938 if ((src_search == 0) && (np->in_spnext == 0) && 6939 (dst_search == 0) && (np->in_dpnext == 0)) { 6940 if (l > 0) 6941 return -1; 6942 } 6943 6944 /* 6945 * Find a new source address 6946 */ 6947 if (ipf_nat_nextaddr(fin, &np->in_nsrc, &frnat.fin_saddr, 6948 &frnat.fin_saddr) == -1) { 6949 return -1; 6950 } 6951 6952 if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0xffffffff)) { 6953 src_search = 0; 6954 if (np->in_stepnext == 0) 6955 np->in_stepnext = 1; 6956 6957 } else if ((np->in_nsrcaddr == 0) && (np->in_nsrcmsk == 0)) { 6958 src_search = 0; 6959 if (np->in_stepnext == 0) 6960 np->in_stepnext = 1; 6961 6962 } else if (np->in_nsrcmsk == 0xffffffff) { 6963 src_search = 0; 6964 if (np->in_stepnext == 0) 6965 np->in_stepnext = 1; 6966 6967 } else if (np->in_nsrcmsk != 0xffffffff) { 6968 if (np->in_stepnext == 0 && changed == -1) { 6969 np->in_snip++; 6970 np->in_stepnext++; 6971 changed = 0; 6972 } 6973 } 6974 6975 if ((flags & IPN_TCPUDPICMP) != 0) { 6976 if (np->in_spnext != 0) 6977 frnat.fin_data[0] = np->in_spnext; 6978 6979 /* 6980 * Standard port translation. Select next port. 6981 */ 6982 if ((flags & IPN_FIXEDSPORT) != 0) { 6983 np->in_stepnext = 2; 6984 } else if ((np->in_stepnext == 1) && 6985 (changed == -1) && (natl != NULL)) { 6986 np->in_spnext++; 6987 np->in_stepnext++; 6988 changed = 1; 6989 if (np->in_spnext > np->in_spmax) 6990 np->in_spnext = np->in_spmin; 6991 } 6992 } else { 6993 np->in_stepnext = 2; 6994 } 6995 np->in_stepnext &= 0x3; 6996 6997 /* 6998 * Find a new destination address 6999 */ 7000 /* TRACE (fin, np, l, frnat) */ 7001 7002 if (ipf_nat_nextaddr(fin, &np->in_ndst, &frnat.fin_daddr, 7003 &frnat.fin_daddr) == -1) 7004 return -1; 7005 if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0xffffffff)) { 7006 dst_search = 0; 7007 if (np->in_stepnext == 2) 7008 np->in_stepnext = 3; 7009 7010 } else if ((np->in_ndstaddr == 0) && (np->in_ndstmsk == 0)) { 7011 dst_search = 0; 7012 if (np->in_stepnext == 2) 7013 np->in_stepnext = 3; 7014 7015 } else if (np->in_ndstmsk == 0xffffffff) { 7016 dst_search = 0; 7017 if (np->in_stepnext == 2) 7018 np->in_stepnext = 3; 7019 7020 } else if (np->in_ndstmsk != 0xffffffff) { 7021 if ((np->in_stepnext == 2) && (changed == -1) && 7022 (natl != NULL)) { 7023 changed = 2; 7024 np->in_stepnext++; 7025 np->in_dnip++; 7026 } 7027 } 7028 7029 if ((flags & IPN_TCPUDPICMP) != 0) { 7030 if (np->in_dpnext != 0) 7031 frnat.fin_data[1] = np->in_dpnext; 7032 7033 /* 7034 * Standard port translation. Select next port. 7035 */ 7036 if ((flags & IPN_FIXEDDPORT) != 0) { 7037 np->in_stepnext = 0; 7038 } else if (np->in_stepnext == 3 && changed == -1) { 7039 np->in_dpnext++; 7040 np->in_stepnext++; 7041 changed = 3; 7042 if (np->in_dpnext > np->in_dpmax) 7043 np->in_dpnext = np->in_dpmin; 7044 } 7045 } else { 7046 if (np->in_stepnext == 3) 7047 np->in_stepnext = 0; 7048 } 7049 7050 /* TRACE (frnat) */ 7051 7052 /* 7053 * Here we do a lookup of the connection as seen from 7054 * the outside. If an IP# pair already exists, try 7055 * again. So if you have A->B becomes C->B, you can 7056 * also have D->E become C->E but not D->B causing 7057 * another C->B. Also take protocol and ports into 7058 * account when determining whether a pre-existing 7059 * NAT setup will cause an external conflict where 7060 * this is appropriate. 7061 * 7062 * fin_data[] is swapped around because we are doing a 7063 * lookup of the packet is if it were moving in the opposite 7064 * direction of the one we are working with now. 7065 */ 7066 if (flags & IPN_TCPUDP) { 7067 swap = frnat.fin_data[0]; 7068 frnat.fin_data[0] = frnat.fin_data[1]; 7069 frnat.fin_data[1] = swap; 7070 } 7071 if (fin->fin_out == 1) { 7072 natl = ipf_nat_inlookup(&frnat, 7073 flags & ~(SI_WILDP|NAT_SEARCH), 7074 (u_int)frnat.fin_p, 7075 frnat.fin_dst, frnat.fin_src); 7076 7077 } else { 7078 natl = ipf_nat_outlookup(&frnat, 7079 flags & ~(SI_WILDP|NAT_SEARCH), 7080 (u_int)frnat.fin_p, 7081 frnat.fin_dst, frnat.fin_src); 7082 } 7083 if (flags & IPN_TCPUDP) { 7084 swap = frnat.fin_data[0]; 7085 frnat.fin_data[0] = frnat.fin_data[1]; 7086 frnat.fin_data[1] = swap; 7087 } 7088 7089 /* TRACE natl, in_stepnext, l */ 7090 7091 if ((natl != NULL) && (l > 8)) /* XXX 8 is arbitrary */ 7092 return -1; 7093 7094 np->in_stepnext &= 0x3; 7095 7096 l++; 7097 changed = -1; 7098 } while (natl != NULL); 7099 7100 nat->nat_osrcip = fin->fin_src; 7101 nat->nat_odstip = fin->fin_dst; 7102 nat->nat_nsrcip = frnat.fin_src; 7103 nat->nat_ndstip = frnat.fin_dst; 7104 7105 if ((flags & IPN_TCPUDP) != 0) { 7106 nat->nat_osport = htons(fin->fin_data[0]); 7107 nat->nat_odport = htons(fin->fin_data[1]); 7108 nat->nat_nsport = htons(frnat.fin_data[0]); 7109 nat->nat_ndport = htons(frnat.fin_data[1]); 7110 } else if ((flags & IPN_ICMPQUERY) != 0) { 7111 nat->nat_oicmpid = fin->fin_data[1]; 7112 nat->nat_nicmpid = frnat.fin_data[1]; 7113 } 7114 7115 return 0; 7116 } 7117 7118 7119 /* ------------------------------------------------------------------------ */ 7120 /* Function: nat_newdivert */ 7121 /* Returns: int - -1 == error, 0 == success */ 7122 /* Parameters: fin(I) - pointer to packet information */ 7123 /* nat(I) - pointer to NAT entry */ 7124 /* ni(I) - pointer to structure with misc. information needed */ 7125 /* to create new NAT entry. */ 7126 /* Write Lock: ipf_nat */ 7127 /* */ 7128 /* Create a new NAT divert session as defined by the NAT rule. This is */ 7129 /* somewhat different to other NAT session creation routines because we */ 7130 /* do not iterate through either port numbers or IP addresses, searching */ 7131 /* for a unique mapping, however, a complimentary duplicate check is made. */ 7132 /* ------------------------------------------------------------------------ */ 7133 static int 7134 ipf_nat_newdivert(fr_info_t *fin, nat_t *nat, natinfo_t *nai) 7135 { 7136 ipf_main_softc_t *softc = fin->fin_main_soft; 7137 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7138 fr_info_t frnat; 7139 ipnat_t *np; 7140 nat_t *natl; 7141 int p; 7142 7143 np = nai->nai_np; 7144 bcopy((char *)fin, (char *)&frnat, sizeof(*fin)); 7145 7146 nat->nat_pr[0] = 0; 7147 nat->nat_osrcaddr = fin->fin_saddr; 7148 nat->nat_odstaddr = fin->fin_daddr; 7149 frnat.fin_saddr = htonl(np->in_snip); 7150 frnat.fin_daddr = htonl(np->in_dnip); 7151 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7152 nat->nat_osport = htons(fin->fin_data[0]); 7153 nat->nat_odport = htons(fin->fin_data[1]); 7154 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7155 nat->nat_oicmpid = fin->fin_data[1]; 7156 } 7157 7158 if (np->in_redir & NAT_DIVERTUDP) { 7159 frnat.fin_data[0] = np->in_spnext; 7160 frnat.fin_data[1] = np->in_dpnext; 7161 frnat.fin_flx |= FI_TCPUDP; 7162 p = IPPROTO_UDP; 7163 } else { 7164 frnat.fin_flx &= ~FI_TCPUDP; 7165 p = IPPROTO_IPIP; 7166 } 7167 7168 if (fin->fin_out == 1) { 7169 natl = ipf_nat_inlookup(&frnat, 0, p, 7170 frnat.fin_dst, frnat.fin_src); 7171 7172 } else { 7173 natl = ipf_nat_outlookup(&frnat, 0, p, 7174 frnat.fin_dst, frnat.fin_src); 7175 } 7176 7177 if (natl != NULL) { 7178 NBUMPSIDED(fin->fin_out, ns_divert_exist); 7179 return -1; 7180 } 7181 7182 nat->nat_nsrcaddr = frnat.fin_saddr; 7183 nat->nat_ndstaddr = frnat.fin_daddr; 7184 if ((nat->nat_flags & IPN_TCPUDP) != 0) { 7185 nat->nat_nsport = htons(frnat.fin_data[0]); 7186 nat->nat_ndport = htons(frnat.fin_data[1]); 7187 } else if ((nat->nat_flags & IPN_ICMPQUERY) != 0) { 7188 nat->nat_nicmpid = frnat.fin_data[1]; 7189 } 7190 7191 nat->nat_pr[fin->fin_out] = fin->fin_p; 7192 nat->nat_pr[1 - fin->fin_out] = p; 7193 7194 if (np->in_redir & NAT_REDIRECT) 7195 nat->nat_dir = NAT_DIVERTIN; 7196 else 7197 nat->nat_dir = NAT_DIVERTOUT; 7198 7199 return 0; 7200 } 7201 7202 7203 /* ------------------------------------------------------------------------ */ 7204 /* Function: nat_builddivertmp */ 7205 /* Returns: int - -1 == error, 0 == success */ 7206 /* Parameters: softn(I) - pointer to NAT context structure */ 7207 /* np(I) - pointer to a NAT rule */ 7208 /* */ 7209 /* For divert rules, a skeleton packet representing what will be prepended */ 7210 /* to the real packet is created. Even though we don't have the full */ 7211 /* packet here, a checksum is calculated that we update later when we */ 7212 /* fill in the final details. At present a 0 checksum for UDP is being set */ 7213 /* here because it is expected that divert will be used for localhost. */ 7214 /* ------------------------------------------------------------------------ */ 7215 static int 7216 ipf_nat_builddivertmp(ipf_nat_softc_t *softn, ipnat_t *np) 7217 { 7218 udphdr_t *uh; 7219 size_t len; 7220 ip_t *ip; 7221 7222 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7223 len = sizeof(ip_t) + sizeof(udphdr_t); 7224 else 7225 len = sizeof(ip_t); 7226 7227 ALLOC_MB_T(np->in_divmp, len); 7228 if (np->in_divmp == NULL) { 7229 NBUMPD(ipf_nat_stats, ns_divert_build); 7230 return -1; 7231 } 7232 7233 /* 7234 * First, the header to get the packet diverted to the new destination 7235 */ 7236 ip = MTOD(np->in_divmp, ip_t *); 7237 IP_V_A(ip, 4); 7238 IP_HL_A(ip, 5); 7239 ip->ip_tos = 0; 7240 if ((np->in_redir & NAT_DIVERTUDP) != 0) 7241 ip->ip_p = IPPROTO_UDP; 7242 else 7243 ip->ip_p = IPPROTO_IPIP; 7244 ip->ip_ttl = 255; 7245 ip->ip_off = 0; 7246 ip->ip_sum = 0; 7247 ip->ip_len = htons(len); 7248 ip->ip_id = 0; 7249 ip->ip_src.s_addr = htonl(np->in_snip); 7250 ip->ip_dst.s_addr = htonl(np->in_dnip); 7251 ip->ip_sum = ipf_cksum((u_short *)ip, sizeof(*ip)); 7252 7253 if (np->in_redir & NAT_DIVERTUDP) { 7254 uh = (udphdr_t *)(ip + 1); 7255 uh->uh_sum = 0; 7256 uh->uh_ulen = 8; 7257 uh->uh_sport = htons(np->in_spnext); 7258 uh->uh_dport = htons(np->in_dpnext); 7259 } 7260 7261 return 0; 7262 } 7263 7264 7265 #define MINDECAP (sizeof(ip_t) + sizeof(udphdr_t) + sizeof(ip_t)) 7266 7267 /* ------------------------------------------------------------------------ */ 7268 /* Function: nat_decap */ 7269 /* Returns: int - -1 == error, 0 == success */ 7270 /* Parameters: fin(I) - pointer to packet information */ 7271 /* nat(I) - pointer to current NAT session */ 7272 /* */ 7273 /* This function is responsible for undoing a packet's encapsulation in the */ 7274 /* reverse of an encap/divert rule. After removing the outer encapsulation */ 7275 /* it is necessary to call ipf_makefrip() again so that the contents of 'fin'*/ 7276 /* match the "new" packet as it may still be used by IPFilter elsewhere. */ 7277 /* We use "dir" here as the basis for some of the expectations about the */ 7278 /* outer header. If we return an error, the goal is to leave the original */ 7279 /* packet information undisturbed - this falls short at the end where we'd */ 7280 /* need to back a backup copy of "fin" - expensive. */ 7281 /* ------------------------------------------------------------------------ */ 7282 static int 7283 ipf_nat_decap(fr_info_t *fin, nat_t *nat) 7284 { 7285 ipf_main_softc_t *softc = fin->fin_main_soft; 7286 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7287 char *hdr; 7288 int hlen; 7289 int skip; 7290 mb_t *m; 7291 7292 if ((fin->fin_flx & FI_ICMPERR) != 0) { 7293 /* 7294 * ICMP packets don't get decapsulated, instead what we need 7295 * to do is change the ICMP reply from including (in the data 7296 * portion for errors) the encapsulated packet that we sent 7297 * out to something that resembles the original packet prior 7298 * to encapsulation. This isn't done here - all we're doing 7299 * here is changing the outer address to ensure that it gets 7300 * targetted back to the correct system. 7301 */ 7302 7303 if (nat->nat_dir & NAT_OUTBOUND) { 7304 u_32_t sum1, sum2, sumd; 7305 7306 sum1 = ntohl(fin->fin_daddr); 7307 sum2 = ntohl(nat->nat_osrcaddr); 7308 CALC_SUMD(sum1, sum2, sumd); 7309 fin->fin_ip->ip_dst = nat->nat_osrcip; 7310 fin->fin_daddr = nat->nat_osrcaddr; 7311 #if !defined(_KERNEL) || defined(MENTAT) || defined(__sgi) || \ 7312 defined(__osf__) || defined(linux) 7313 ipf_fix_outcksum(0, &fin->fin_ip->ip_sum, sumd, 0); 7314 #endif 7315 } 7316 return 0; 7317 } 7318 7319 m = fin->fin_m; 7320 skip = fin->fin_hlen; 7321 7322 switch (nat->nat_dir) 7323 { 7324 case NAT_DIVERTIN : 7325 case NAT_DIVERTOUT : 7326 if (fin->fin_plen < MINDECAP) 7327 return -1; 7328 skip += sizeof(udphdr_t); 7329 break; 7330 7331 case NAT_ENCAPIN : 7332 case NAT_ENCAPOUT : 7333 if (fin->fin_plen < (skip + sizeof(ip_t))) 7334 return -1; 7335 break; 7336 default : 7337 return -1; 7338 /* NOTREACHED */ 7339 } 7340 7341 /* 7342 * The aim here is to keep the original packet details in "fin" for 7343 * as long as possible so that returning with an error is for the 7344 * original packet and there is little undoing work to do. 7345 */ 7346 if (M_LEN(m) < skip + sizeof(ip_t)) { 7347 if (ipf_pr_pullup(fin, skip + sizeof(ip_t)) == -1) 7348 return -1; 7349 } 7350 7351 hdr = MTOD(fin->fin_m, char *); 7352 fin->fin_ip = (ip_t *)(hdr + skip); 7353 hlen = IP_HL(fin->fin_ip) << 2; 7354 7355 if (ipf_pr_pullup(fin, skip + hlen) == -1) { 7356 NBUMPSIDED(fin->fin_out, ns_decap_pullup); 7357 return -1; 7358 } 7359 7360 fin->fin_hlen = hlen; 7361 fin->fin_dlen -= skip; 7362 fin->fin_plen -= skip; 7363 fin->fin_ipoff += skip; 7364 7365 if (ipf_makefrip(hlen, (ip_t *)hdr, fin) == -1) { 7366 NBUMPSIDED(fin->fin_out, ns_decap_bad); 7367 return -1; 7368 } 7369 7370 return skip; 7371 } 7372 7373 7374 /* ------------------------------------------------------------------------ */ 7375 /* Function: nat_nextaddr */ 7376 /* Returns: int - -1 == bad input (no new address), */ 7377 /* 0 == success and dst has new address */ 7378 /* Parameters: fin(I) - pointer to packet information */ 7379 /* na(I) - how to generate new address */ 7380 /* old(I) - original address being replaced */ 7381 /* dst(O) - where to put the new address */ 7382 /* Write Lock: ipf_nat */ 7383 /* */ 7384 /* This function uses the contents of the "na" structure, in combination */ 7385 /* with "old" to produce a new address to store in "dst". Not all of the */ 7386 /* possible uses of "na" will result in a new address. */ 7387 /* ------------------------------------------------------------------------ */ 7388 static int 7389 ipf_nat_nextaddr(fr_info_t *fin, nat_addr_t *na, u_32_t *old, u_32_t *dst) 7390 { 7391 ipf_main_softc_t *softc = fin->fin_main_soft; 7392 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7393 u_32_t amin, amax, new; 7394 i6addr_t newip; 7395 int error; 7396 7397 new = 0; 7398 amin = na->na_addr[0].in4.s_addr; 7399 7400 switch (na->na_atype) 7401 { 7402 case FRI_RANGE : 7403 amax = na->na_addr[1].in4.s_addr; 7404 break; 7405 7406 case FRI_NETMASKED : 7407 case FRI_DYNAMIC : 7408 case FRI_NORMAL : 7409 /* 7410 * Compute the maximum address by adding the inverse of the 7411 * netmask to the minimum address. 7412 */ 7413 amax = ~na->na_addr[1].in4.s_addr; 7414 amax |= amin; 7415 break; 7416 7417 case FRI_LOOKUP : 7418 break; 7419 7420 case FRI_BROADCAST : 7421 case FRI_PEERADDR : 7422 case FRI_NETWORK : 7423 default : 7424 return -1; 7425 } 7426 7427 error = -1; 7428 7429 if (na->na_atype == FRI_LOOKUP) { 7430 if (na->na_type == IPLT_DSTLIST) { 7431 error = ipf_dstlist_select_node(fin, na->na_ptr, dst, 7432 NULL); 7433 } else { 7434 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7435 } 7436 7437 } else if (na->na_atype == IPLT_NONE) { 7438 /* 7439 * 0/0 as the new address means leave it alone. 7440 */ 7441 if (na->na_addr[0].in4.s_addr == 0 && 7442 na->na_addr[1].in4.s_addr == 0) { 7443 new = *old; 7444 7445 /* 7446 * 0/32 means get the interface's address 7447 */ 7448 } else if (na->na_addr[0].in4.s_addr == 0 && 7449 na->na_addr[1].in4.s_addr == 0xffffffff) { 7450 if (ipf_ifpaddr(softc, 4, na->na_atype, 7451 fin->fin_ifp, &newip, NULL) == -1) { 7452 NBUMPSIDED(fin->fin_out, ns_ifpaddrfail); 7453 return -1; 7454 } 7455 new = newip.in4.s_addr; 7456 } else { 7457 new = htonl(na->na_nextip); 7458 } 7459 *dst = new; 7460 error = 0; 7461 7462 } else { 7463 NBUMPSIDE(fin->fin_out, ns_badnextaddr); 7464 } 7465 7466 return error; 7467 } 7468 7469 7470 /* ------------------------------------------------------------------------ */ 7471 /* Function: nat_nextaddrinit */ 7472 /* Returns: int - 0 == success, else error number */ 7473 /* Parameters: softc(I) - pointer to soft context main structure */ 7474 /* na(I) - NAT address information for generating new addr*/ 7475 /* initial(I) - flag indicating if it is the first call for */ 7476 /* this "na" structure. */ 7477 /* ifp(I) - network interface to derive address */ 7478 /* information from. */ 7479 /* */ 7480 /* This function is expected to be called in two scenarious: when a new NAT */ 7481 /* rule is loaded into the kernel and when the list of NAT rules is sync'd */ 7482 /* up with the valid network interfaces (possibly due to them changing.) */ 7483 /* To distinguish between these, the "initial" parameter is used. If it is */ 7484 /* 1 then this indicates the rule has just been reloaded and 0 for when we */ 7485 /* are updating information. This difference is important because in */ 7486 /* instances where we are not updating address information associated with */ 7487 /* a network interface, we don't want to disturb what the "next" address to */ 7488 /* come out of ipf_nat_nextaddr() will be. */ 7489 /* ------------------------------------------------------------------------ */ 7490 static int 7491 ipf_nat_nextaddrinit(ipf_main_softc_t *softc, char *base, nat_addr_t *na, 7492 int initial, void *ifp) 7493 { 7494 7495 switch (na->na_atype) 7496 { 7497 case FRI_LOOKUP : 7498 if (na->na_subtype == 0) { 7499 na->na_ptr = ipf_lookup_res_num(softc, IPL_LOGNAT, 7500 na->na_type, 7501 na->na_num, 7502 &na->na_func); 7503 } else if (na->na_subtype == 1) { 7504 na->na_ptr = ipf_lookup_res_name(softc, IPL_LOGNAT, 7505 na->na_type, 7506 base + na->na_num, 7507 &na->na_func); 7508 } 7509 if (na->na_func == NULL) { 7510 IPFERROR(60060); 7511 return ESRCH; 7512 } 7513 if (na->na_ptr == NULL) { 7514 IPFERROR(60056); 7515 return ESRCH; 7516 } 7517 break; 7518 7519 case FRI_DYNAMIC : 7520 case FRI_BROADCAST : 7521 case FRI_NETWORK : 7522 case FRI_NETMASKED : 7523 case FRI_PEERADDR : 7524 if (ifp != NULL) 7525 (void )ipf_ifpaddr(softc, 4, na->na_atype, ifp, 7526 &na->na_addr[0], &na->na_addr[1]); 7527 break; 7528 7529 case FRI_SPLIT : 7530 case FRI_RANGE : 7531 if (initial) 7532 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7533 break; 7534 7535 case FRI_NONE : 7536 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7537 return 0; 7538 7539 case FRI_NORMAL : 7540 na->na_addr[0].in4.s_addr &= na->na_addr[1].in4.s_addr; 7541 break; 7542 7543 default : 7544 IPFERROR(60054); 7545 return EINVAL; 7546 } 7547 7548 if (initial && (na->na_atype == FRI_NORMAL)) { 7549 if (na->na_addr[0].in4.s_addr == 0) { 7550 if ((na->na_addr[1].in4.s_addr == 0xffffffff) || 7551 (na->na_addr[1].in4.s_addr == 0)) { 7552 return 0; 7553 } 7554 } 7555 7556 if (na->na_addr[1].in4.s_addr == 0xffffffff) { 7557 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr); 7558 } else { 7559 na->na_nextip = ntohl(na->na_addr[0].in4.s_addr) + 1; 7560 } 7561 } 7562 7563 return 0; 7564 } 7565 7566 7567 /* ------------------------------------------------------------------------ */ 7568 /* Function: ipf_nat_matchflush */ 7569 /* Returns: int - -1 == error, 0 == success */ 7570 /* Parameters: softc(I) - pointer to soft context main structure */ 7571 /* softn(I) - pointer to NAT context structure */ 7572 /* nat(I) - pointer to current NAT session */ 7573 /* */ 7574 /* ------------------------------------------------------------------------ */ 7575 static int 7576 ipf_nat_matchflush(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, void *data) 7577 { 7578 int *array, flushed, error; 7579 nat_t *nat, *natnext; 7580 ipfobj_t obj; 7581 7582 error = ipf_matcharray_load(softc, data, &obj, &array); 7583 if (error != 0) 7584 return error; 7585 7586 flushed = 0; 7587 7588 for (nat = softn->ipf_nat_instances; nat != NULL; nat = natnext) { 7589 natnext = nat->nat_next; 7590 if (ipf_nat_matcharray(nat, array, softc->ipf_ticks) == 0) { 7591 ipf_nat_delete(softc, nat, NL_FLUSH); 7592 flushed++; 7593 } 7594 } 7595 7596 obj.ipfo_retval = flushed; 7597 error = BCOPYOUT(&obj, data, sizeof(obj)); 7598 7599 KFREES(array, array[0] * sizeof(*array)); 7600 7601 return error; 7602 } 7603 7604 7605 /* ------------------------------------------------------------------------ */ 7606 /* Function: ipf_nat_matcharray */ 7607 /* Returns: int - -1 == error, 0 == success */ 7608 /* Parameters: fin(I) - pointer to packet information */ 7609 /* nat(I) - pointer to current NAT session */ 7610 /* */ 7611 /* ------------------------------------------------------------------------ */ 7612 static int 7613 ipf_nat_matcharray(nat_t *nat, int *array, u_long ticks) 7614 { 7615 int i, n, *x, e, p; 7616 7617 e = 0; 7618 n = array[0]; 7619 x = array + 1; 7620 7621 for (; n > 0; x += 3 + x[2]) { 7622 if (x[0] == IPF_EXP_END) 7623 break; 7624 e = 0; 7625 7626 n -= x[2] + 3; 7627 if (n < 0) 7628 break; 7629 7630 p = x[0] >> 16; 7631 if (p != 0 && p != nat->nat_pr[1]) 7632 break; 7633 7634 switch (x[0]) 7635 { 7636 case IPF_EXP_IP_PR : 7637 for (i = 0; !e && i < x[2]; i++) { 7638 e |= (nat->nat_pr[1] == x[i + 3]); 7639 } 7640 break; 7641 7642 case IPF_EXP_IP_SRCADDR : 7643 if (nat->nat_v[0] == 4) { 7644 for (i = 0; !e && i < x[2]; i++) { 7645 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7646 x[i + 3]); 7647 } 7648 } 7649 if (nat->nat_v[1] == 4) { 7650 for (i = 0; !e && i < x[2]; i++) { 7651 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7652 x[i + 3]); 7653 } 7654 } 7655 break; 7656 7657 case IPF_EXP_IP_DSTADDR : 7658 if (nat->nat_v[0] == 4) { 7659 for (i = 0; !e && i < x[2]; i++) { 7660 e |= ((nat->nat_odstaddr & x[i + 4]) == 7661 x[i + 3]); 7662 } 7663 } 7664 if (nat->nat_v[1] == 4) { 7665 for (i = 0; !e && i < x[2]; i++) { 7666 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7667 x[i + 3]); 7668 } 7669 } 7670 break; 7671 7672 case IPF_EXP_IP_ADDR : 7673 for (i = 0; !e && i < x[2]; i++) { 7674 if (nat->nat_v[0] == 4) { 7675 e |= ((nat->nat_osrcaddr & x[i + 4]) == 7676 x[i + 3]); 7677 } 7678 if (nat->nat_v[1] == 4) { 7679 e |= ((nat->nat_nsrcaddr & x[i + 4]) == 7680 x[i + 3]); 7681 } 7682 if (nat->nat_v[0] == 4) { 7683 e |= ((nat->nat_odstaddr & x[i + 4]) == 7684 x[i + 3]); 7685 } 7686 if (nat->nat_v[1] == 4) { 7687 e |= ((nat->nat_ndstaddr & x[i + 4]) == 7688 x[i + 3]); 7689 } 7690 } 7691 break; 7692 7693 #ifdef USE_INET6 7694 case IPF_EXP_IP6_SRCADDR : 7695 if (nat->nat_v[0] == 6) { 7696 for (i = 0; !e && i < x[3]; i++) { 7697 e |= IP6_MASKEQ(&nat->nat_osrc6, 7698 x + i + 7, x + i + 3); 7699 } 7700 } 7701 if (nat->nat_v[1] == 6) { 7702 for (i = 0; !e && i < x[3]; i++) { 7703 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7704 x + i + 7, x + i + 3); 7705 } 7706 } 7707 break; 7708 7709 case IPF_EXP_IP6_DSTADDR : 7710 if (nat->nat_v[0] == 6) { 7711 for (i = 0; !e && i < x[3]; i++) { 7712 e |= IP6_MASKEQ(&nat->nat_odst6, 7713 x + i + 7, 7714 x + i + 3); 7715 } 7716 } 7717 if (nat->nat_v[1] == 6) { 7718 for (i = 0; !e && i < x[3]; i++) { 7719 e |= IP6_MASKEQ(&nat->nat_ndst6, 7720 x + i + 7, 7721 x + i + 3); 7722 } 7723 } 7724 break; 7725 7726 case IPF_EXP_IP6_ADDR : 7727 for (i = 0; !e && i < x[3]; i++) { 7728 if (nat->nat_v[0] == 6) { 7729 e |= IP6_MASKEQ(&nat->nat_osrc6, 7730 x + i + 7, 7731 x + i + 3); 7732 } 7733 if (nat->nat_v[0] == 6) { 7734 e |= IP6_MASKEQ(&nat->nat_odst6, 7735 x + i + 7, 7736 x + i + 3); 7737 } 7738 if (nat->nat_v[1] == 6) { 7739 e |= IP6_MASKEQ(&nat->nat_nsrc6, 7740 x + i + 7, 7741 x + i + 3); 7742 } 7743 if (nat->nat_v[1] == 6) { 7744 e |= IP6_MASKEQ(&nat->nat_ndst6, 7745 x + i + 7, 7746 x + i + 3); 7747 } 7748 } 7749 break; 7750 #endif 7751 7752 case IPF_EXP_UDP_PORT : 7753 case IPF_EXP_TCP_PORT : 7754 for (i = 0; !e && i < x[2]; i++) { 7755 e |= (nat->nat_nsport == x[i + 3]) || 7756 (nat->nat_ndport == x[i + 3]); 7757 } 7758 break; 7759 7760 case IPF_EXP_UDP_SPORT : 7761 case IPF_EXP_TCP_SPORT : 7762 for (i = 0; !e && i < x[2]; i++) { 7763 e |= (nat->nat_nsport == x[i + 3]); 7764 } 7765 break; 7766 7767 case IPF_EXP_UDP_DPORT : 7768 case IPF_EXP_TCP_DPORT : 7769 for (i = 0; !e && i < x[2]; i++) { 7770 e |= (nat->nat_ndport == x[i + 3]); 7771 } 7772 break; 7773 7774 case IPF_EXP_TCP_STATE : 7775 for (i = 0; !e && i < x[2]; i++) { 7776 e |= (nat->nat_tcpstate[0] == x[i + 3]) || 7777 (nat->nat_tcpstate[1] == x[i + 3]); 7778 } 7779 break; 7780 7781 case IPF_EXP_IDLE_GT : 7782 e |= (ticks - nat->nat_touched > x[3]); 7783 break; 7784 } 7785 e ^= x[1]; 7786 7787 if (!e) 7788 break; 7789 } 7790 7791 return e; 7792 } 7793 7794 7795 /* ------------------------------------------------------------------------ */ 7796 /* Function: ipf_nat_gettable */ 7797 /* Returns: int - 0 = success, else error */ 7798 /* Parameters: softc(I) - pointer to soft context main structure */ 7799 /* softn(I) - pointer to NAT context structure */ 7800 /* data(I) - pointer to ioctl data */ 7801 /* */ 7802 /* This function handles ioctl requests for tables of nat information. */ 7803 /* At present the only table it deals with is the hash bucket statistics. */ 7804 /* ------------------------------------------------------------------------ */ 7805 static int 7806 ipf_nat_gettable(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, char *data) 7807 { 7808 ipftable_t table; 7809 int error; 7810 7811 error = ipf_inobj(softc, data, NULL, &table, IPFOBJ_GTABLE); 7812 if (error != 0) 7813 return error; 7814 7815 switch (table.ita_type) 7816 { 7817 case IPFTABLE_BUCKETS_NATIN : 7818 error = COPYOUT(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 7819 table.ita_table, 7820 softn->ipf_nat_table_sz * sizeof(u_int)); 7821 break; 7822 7823 case IPFTABLE_BUCKETS_NATOUT : 7824 error = COPYOUT(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 7825 table.ita_table, 7826 softn->ipf_nat_table_sz * sizeof(u_int)); 7827 break; 7828 7829 default : 7830 IPFERROR(60058); 7831 return EINVAL; 7832 } 7833 7834 if (error != 0) { 7835 IPFERROR(60059); 7836 error = EFAULT; 7837 } 7838 return error; 7839 } 7840 7841 7842 /* ------------------------------------------------------------------------ */ 7843 /* Function: ipf_nat_settimeout */ 7844 /* Returns: int - 0 = success, else failure */ 7845 /* Parameters: softc(I) - pointer to soft context main structure */ 7846 /* t(I) - pointer to tunable */ 7847 /* p(I) - pointer to new tuning data */ 7848 /* */ 7849 /* Apply the timeout change to the NAT timeout queues. */ 7850 /* ------------------------------------------------------------------------ */ 7851 int 7852 ipf_nat_settimeout(struct ipf_main_softc_s *softc, ipftuneable_t *t, 7853 ipftuneval_t *p) 7854 { 7855 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7856 7857 if (!strncmp(t->ipft_name, "tcp_", 4)) 7858 return ipf_settimeout_tcp(t, p, softn->ipf_nat_tcptq); 7859 7860 if (!strcmp(t->ipft_name, "udp_timeout")) { 7861 ipf_apply_timeout(&softn->ipf_nat_udptq, p->ipftu_int); 7862 } else if (!strcmp(t->ipft_name, "udp_ack_timeout")) { 7863 ipf_apply_timeout(&softn->ipf_nat_udpacktq, p->ipftu_int); 7864 } else if (!strcmp(t->ipft_name, "icmp_timeout")) { 7865 ipf_apply_timeout(&softn->ipf_nat_icmptq, p->ipftu_int); 7866 } else if (!strcmp(t->ipft_name, "icmp_ack_timeout")) { 7867 ipf_apply_timeout(&softn->ipf_nat_icmpacktq, p->ipftu_int); 7868 } else if (!strcmp(t->ipft_name, "ip_timeout")) { 7869 ipf_apply_timeout(&softn->ipf_nat_iptq, p->ipftu_int); 7870 } else { 7871 IPFERROR(60062); 7872 return ESRCH; 7873 } 7874 return 0; 7875 } 7876 7877 7878 /* ------------------------------------------------------------------------ */ 7879 /* Function: ipf_nat_rehash */ 7880 /* Returns: int - 0 = success, else failure */ 7881 /* Parameters: softc(I) - pointer to soft context main structure */ 7882 /* t(I) - pointer to tunable */ 7883 /* p(I) - pointer to new tuning data */ 7884 /* */ 7885 /* To change the size of the basic NAT table, we need to first allocate the */ 7886 /* new tables (lest it fails and we've got nowhere to store all of the NAT */ 7887 /* sessions currently active) and then walk through the entire list and */ 7888 /* insert them into the table. There are two tables here: an inbound one */ 7889 /* and an outbound one. Each NAT entry goes into each table once. */ 7890 /* ------------------------------------------------------------------------ */ 7891 int 7892 ipf_nat_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) 7893 { 7894 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 7895 nat_t **newtab[2], *nat, **natp; 7896 u_int *bucketlens[2]; 7897 u_int maxbucket; 7898 u_int newsize; 7899 int error; 7900 u_int hv; 7901 int i; 7902 7903 newsize = p->ipftu_int; 7904 /* 7905 * In case there is nothing to do... 7906 */ 7907 if (newsize == softn->ipf_nat_table_sz) 7908 return 0; 7909 7910 newtab[0] = NULL; 7911 newtab[1] = NULL; 7912 bucketlens[0] = NULL; 7913 bucketlens[1] = NULL; 7914 /* 7915 * 4 tables depend on the NAT table size: the inbound looking table, 7916 * the outbound lookup table and the hash chain length for each. 7917 */ 7918 KMALLOCS(newtab[0], nat_t **, newsize * sizeof(nat_t *)); 7919 if (newtab[0] == NULL) { 7920 error = 60063; 7921 goto badrehash; 7922 } 7923 7924 KMALLOCS(newtab[1], nat_t **, newsize * sizeof(nat_t *)); 7925 if (newtab[1] == NULL) { 7926 error = 60064; 7927 goto badrehash; 7928 } 7929 7930 KMALLOCS(bucketlens[0], u_int *, newsize * sizeof(u_int)); 7931 if (bucketlens[0] == NULL) { 7932 error = 60065; 7933 goto badrehash; 7934 } 7935 7936 KMALLOCS(bucketlens[1], u_int *, newsize * sizeof(u_int)); 7937 if (bucketlens[1] == NULL) { 7938 error = 60066; 7939 goto badrehash; 7940 } 7941 7942 /* 7943 * Recalculate the maximum length based on the new size. 7944 */ 7945 for (maxbucket = 0, i = newsize; i > 0; i >>= 1) 7946 maxbucket++; 7947 maxbucket *= 2; 7948 7949 bzero((char *)newtab[0], newsize * sizeof(nat_t *)); 7950 bzero((char *)newtab[1], newsize * sizeof(nat_t *)); 7951 bzero((char *)bucketlens[0], newsize * sizeof(u_int)); 7952 bzero((char *)bucketlens[1], newsize * sizeof(u_int)); 7953 7954 WRITE_ENTER(&softc->ipf_nat); 7955 7956 if (softn->ipf_nat_table[0] != NULL) { 7957 KFREES(softn->ipf_nat_table[0], 7958 softn->ipf_nat_table_sz * 7959 sizeof(*softn->ipf_nat_table[0])); 7960 } 7961 softn->ipf_nat_table[0] = newtab[0]; 7962 7963 if (softn->ipf_nat_table[1] != NULL) { 7964 KFREES(softn->ipf_nat_table[1], 7965 softn->ipf_nat_table_sz * 7966 sizeof(*softn->ipf_nat_table[1])); 7967 } 7968 softn->ipf_nat_table[1] = newtab[1]; 7969 7970 if (softn->ipf_nat_stats.ns_side[0].ns_bucketlen != NULL) { 7971 KFREES(softn->ipf_nat_stats.ns_side[0].ns_bucketlen, 7972 softn->ipf_nat_table_sz * sizeof(u_int)); 7973 } 7974 softn->ipf_nat_stats.ns_side[0].ns_bucketlen = bucketlens[0]; 7975 7976 if (softn->ipf_nat_stats.ns_side[1].ns_bucketlen != NULL) { 7977 KFREES(softn->ipf_nat_stats.ns_side[1].ns_bucketlen, 7978 softn->ipf_nat_table_sz * sizeof(u_int)); 7979 } 7980 softn->ipf_nat_stats.ns_side[1].ns_bucketlen = bucketlens[1]; 7981 7982 softn->ipf_nat_maxbucket = maxbucket; 7983 softn->ipf_nat_table_sz = newsize; 7984 /* 7985 * Walk through the entire list of NAT table entries and put them 7986 * in the new NAT table, somewhere. Because we have a new table, 7987 * we need to restart the counter of how many chains are in use. 7988 */ 7989 softn->ipf_nat_stats.ns_side[0].ns_inuse = 0; 7990 softn->ipf_nat_stats.ns_side[1].ns_inuse = 0; 7991 7992 for (nat = softn->ipf_nat_instances; nat != NULL; nat = nat->nat_next) { 7993 nat->nat_hnext[0] = NULL; 7994 nat->nat_phnext[0] = NULL; 7995 hv = nat->nat_hv[0] % softn->ipf_nat_table_sz; 7996 7997 natp = &softn->ipf_nat_table[0][hv]; 7998 if (*natp) { 7999 (*natp)->nat_phnext[0] = &nat->nat_hnext[0]; 8000 } else { 8001 NBUMPSIDE(0, ns_inuse); 8002 } 8003 nat->nat_phnext[0] = natp; 8004 nat->nat_hnext[0] = *natp; 8005 *natp = nat; 8006 NBUMPSIDE(0, ns_bucketlen[hv]); 8007 8008 nat->nat_hnext[1] = NULL; 8009 nat->nat_phnext[1] = NULL; 8010 hv = nat->nat_hv[1] % softn->ipf_nat_table_sz; 8011 8012 natp = &softn->ipf_nat_table[1][hv]; 8013 if (*natp) { 8014 (*natp)->nat_phnext[1] = &nat->nat_hnext[1]; 8015 } else { 8016 NBUMPSIDE(1, ns_inuse); 8017 } 8018 nat->nat_phnext[1] = natp; 8019 nat->nat_hnext[1] = *natp; 8020 *natp = nat; 8021 NBUMPSIDE(1, ns_bucketlen[hv]); 8022 } 8023 RWLOCK_EXIT(&softc->ipf_nat); 8024 8025 return 0; 8026 8027 badrehash: 8028 if (bucketlens[1] != NULL) { 8029 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8030 } 8031 if (bucketlens[0] != NULL) { 8032 KFREES(bucketlens[0], newsize * sizeof(u_int)); 8033 } 8034 if (newtab[0] != NULL) { 8035 KFREES(newtab[0], newsize * sizeof(nat_t *)); 8036 } 8037 if (newtab[1] != NULL) { 8038 KFREES(newtab[1], newsize * sizeof(nat_t *)); 8039 } 8040 IPFERROR(error); 8041 return ENOMEM; 8042 } 8043 8044 8045 /* ------------------------------------------------------------------------ */ 8046 /* Function: ipf_nat_rehash_rules */ 8047 /* Returns: int - 0 = success, else failure */ 8048 /* Parameters: softc(I) - pointer to soft context main structure */ 8049 /* t(I) - pointer to tunable */ 8050 /* p(I) - pointer to new tuning data */ 8051 /* */ 8052 /* All of the NAT rules hang off of a hash table that is searched with a */ 8053 /* hash on address after the netmask is applied. There is a different table*/ 8054 /* for both inbound rules (rdr) and outbound (map.) The resizing will only */ 8055 /* affect one of these two tables. */ 8056 /* ------------------------------------------------------------------------ */ 8057 int 8058 ipf_nat_rehash_rules(ipf_main_softc_t *softc, ipftuneable_t *t, ipftuneval_t *p) 8059 { 8060 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8061 ipnat_t **newtab, *np, ***old, **npp; 8062 u_int newsize; 8063 u_int mask; 8064 u_int hv; 8065 8066 newsize = p->ipftu_int; 8067 /* 8068 * In case there is nothing to do... 8069 */ 8070 if (newsize == *t->ipft_pint) 8071 return 0; 8072 8073 /* 8074 * All inbound rules have the NAT_REDIRECT bit set in in_redir and 8075 * all outbound rules have either NAT_MAP or MAT_MAPBLK set. 8076 * This if statement allows for some more generic code to be below, 8077 * rather than two huge gobs of code that almost do the same thing. 8078 */ 8079 if (t->ipft_pint == &softn->ipf_nat_rdrrules_sz) { 8080 old = &softn->ipf_nat_rdr_rules; 8081 mask = NAT_REDIRECT; 8082 } else { 8083 old = &softn->ipf_nat_map_rules; 8084 mask = NAT_MAP|NAT_MAPBLK; 8085 } 8086 8087 KMALLOCS(newtab, ipnat_t **, newsize * sizeof(ipnat_t *)); 8088 if (newtab == NULL) { 8089 IPFERROR(60067); 8090 return ENOMEM; 8091 } 8092 8093 bzero((char *)newtab, newsize * sizeof(ipnat_t *)); 8094 8095 WRITE_ENTER(&softc->ipf_nat); 8096 8097 if (*old != NULL) { 8098 KFREES(*old, *t->ipft_pint * sizeof(ipnat_t **)); 8099 } 8100 *old = newtab; 8101 *t->ipft_pint = newsize; 8102 8103 for (np = softn->ipf_nat_list; np != NULL; np = np->in_next) { 8104 if ((np->in_redir & mask) == 0) 8105 continue; 8106 8107 if (np->in_redir & NAT_REDIRECT) { 8108 np->in_rnext = NULL; 8109 hv = np->in_hv[0] % newsize; 8110 for (npp = newtab + hv; *npp != NULL; ) 8111 npp = &(*npp)->in_rnext; 8112 np->in_prnext = npp; 8113 *npp = np; 8114 } 8115 if (np->in_redir & NAT_MAP) { 8116 np->in_mnext = NULL; 8117 hv = np->in_hv[1] % newsize; 8118 for (npp = newtab + hv; *npp != NULL; ) 8119 npp = &(*npp)->in_mnext; 8120 np->in_pmnext = npp; 8121 *npp = np; 8122 } 8123 8124 } 8125 RWLOCK_EXIT(&softc->ipf_nat); 8126 8127 return 0; 8128 } 8129 8130 8131 /* ------------------------------------------------------------------------ */ 8132 /* Function: ipf_nat_hostmap_rehash */ 8133 /* Returns: int - 0 = success, else failure */ 8134 /* Parameters: softc(I) - pointer to soft context main structure */ 8135 /* t(I) - pointer to tunable */ 8136 /* p(I) - pointer to new tuning data */ 8137 /* */ 8138 /* Allocate and populate a new hash table that will contain a reference to */ 8139 /* all of the active IP# translations currently in place. */ 8140 /* ------------------------------------------------------------------------ */ 8141 int 8142 ipf_nat_hostmap_rehash(ipf_main_softc_t *softc, ipftuneable_t *t, 8143 ipftuneval_t *p) 8144 { 8145 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8146 hostmap_t *hm, **newtab; 8147 u_int newsize; 8148 u_int hv; 8149 8150 newsize = p->ipftu_int; 8151 /* 8152 * In case there is nothing to do... 8153 */ 8154 if (newsize == *t->ipft_pint) 8155 return 0; 8156 8157 KMALLOCS(newtab, hostmap_t **, newsize * sizeof(hostmap_t *)); 8158 if (newtab == NULL) { 8159 IPFERROR(60068); 8160 return ENOMEM; 8161 } 8162 8163 bzero((char *)newtab, newsize * sizeof(hostmap_t *)); 8164 8165 WRITE_ENTER(&softc->ipf_nat); 8166 if (softn->ipf_hm_maptable != NULL) { 8167 KFREES(softn->ipf_hm_maptable, 8168 softn->ipf_nat_hostmap_sz * sizeof(hostmap_t *)); 8169 } 8170 softn->ipf_hm_maptable = newtab; 8171 softn->ipf_nat_hostmap_sz = newsize; 8172 8173 for (hm = softn->ipf_hm_maplist; hm != NULL; hm = hm->hm_next) { 8174 hv = hm->hm_hv % softn->ipf_nat_hostmap_sz; 8175 hm->hm_hnext = softn->ipf_hm_maptable[hv]; 8176 hm->hm_phnext = softn->ipf_hm_maptable + hv; 8177 if (softn->ipf_hm_maptable[hv] != NULL) 8178 softn->ipf_hm_maptable[hv]->hm_phnext = &hm->hm_hnext; 8179 softn->ipf_hm_maptable[hv] = hm; 8180 } 8181 RWLOCK_EXIT(&softc->ipf_nat); 8182 8183 return 0; 8184 } 8185 8186 8187 /* ------------------------------------------------------------------------ */ 8188 /* Function: ipf_nat_add_tq */ 8189 /* Parameters: softc(I) - pointer to soft context main structure */ 8190 /* */ 8191 /* ------------------------------------------------------------------------ */ 8192 ipftq_t * 8193 ipf_nat_add_tq(ipf_main_softc_t *softc, int ttl) 8194 { 8195 ipf_nat_softc_t *softs = softc->ipf_nat_soft; 8196 8197 return ipf_addtimeoutqueue(softc, &softs->ipf_nat_utqe, ttl); 8198 } 8199 8200 /* ------------------------------------------------------------------------ */ 8201 /* Function: ipf_nat_uncreate */ 8202 /* Returns: Nil */ 8203 /* Parameters: fin(I) - pointer to packet information */ 8204 /* */ 8205 /* This function is used to remove a NAT entry from the NAT table when we */ 8206 /* decide that the create was actually in error. It is thus assumed that */ 8207 /* fin_flx will have both FI_NATED and FI_NATNEW set. Because we're dealing */ 8208 /* with the translated packet (not the original), we have to reverse the */ 8209 /* lookup. Although doing the lookup is expensive (relatively speaking), it */ 8210 /* is not anticipated that this will be a frequent occurance for normal */ 8211 /* traffic patterns. */ 8212 /* ------------------------------------------------------------------------ */ 8213 void 8214 ipf_nat_uncreate(fr_info_t *fin) 8215 { 8216 ipf_main_softc_t *softc = fin->fin_main_soft; 8217 ipf_nat_softc_t *softn = softc->ipf_nat_soft; 8218 int nflags; 8219 nat_t *nat; 8220 8221 switch (fin->fin_p) 8222 { 8223 case IPPROTO_TCP : 8224 nflags = IPN_TCP; 8225 break; 8226 case IPPROTO_UDP : 8227 nflags = IPN_UDP; 8228 break; 8229 default : 8230 nflags = 0; 8231 break; 8232 } 8233 8234 WRITE_ENTER(&softc->ipf_nat); 8235 8236 if (fin->fin_out == 0) { 8237 nat = ipf_nat_outlookup(fin, nflags, (u_int)fin->fin_p, 8238 fin->fin_dst, fin->fin_src); 8239 } else { 8240 nat = ipf_nat_inlookup(fin, nflags, (u_int)fin->fin_p, 8241 fin->fin_src, fin->fin_dst); 8242 } 8243 8244 if (nat != NULL) { 8245 NBUMPSIDE(fin->fin_out, ns_uncreate[0]); 8246 ipf_nat_delete(softc, nat, NL_DESTROY); 8247 } else { 8248 NBUMPSIDE(fin->fin_out, ns_uncreate[1]); 8249 } 8250 8251 RWLOCK_EXIT(&softc->ipf_nat); 8252 } 8253 8254 8255 /* ------------------------------------------------------------------------ */ 8256 /* Function: ipf_nat_cmp_rules */ 8257 /* Returns: int - 0 == success, else rules do not match. */ 8258 /* Parameters: n1(I) - first rule to compare */ 8259 /* n2(I) - first rule to compare */ 8260 /* */ 8261 /* Compare two rules using pointers to each rule. A straight bcmp will not */ 8262 /* work as some fields (such as in_dst, in_pkts) actually do change once */ 8263 /* the rule has been loaded into the kernel. Whilst this function returns */ 8264 /* various non-zero returns, they're strictly to aid in debugging. Use of */ 8265 /* this function should simply care if the result is zero or not. */ 8266 /* ------------------------------------------------------------------------ */ 8267 static int 8268 ipf_nat_cmp_rules(ipnat_t *n1, ipnat_t *n2) 8269 { 8270 if (n1->in_size != n2->in_size) 8271 return 1; 8272 8273 if (bcmp((char *)&n1->in_v, (char *)&n2->in_v, 8274 offsetof(ipnat_t, in_ndst) - offsetof(ipnat_t, in_v)) != 0) 8275 return 2; 8276 8277 if (bcmp((char *)&n1->in_tuc, (char *)&n2->in_tuc, 8278 n1->in_size - offsetof(ipnat_t, in_tuc)) != 0) 8279 return 3; 8280 if (n1->in_ndst.na_atype != n2->in_ndst.na_atype) 8281 return 5; 8282 if (n1->in_ndst.na_function != n2->in_ndst.na_function) 8283 return 6; 8284 if (bcmp((char *)&n1->in_ndst.na_addr, (char *)&n2->in_ndst.na_addr, 8285 sizeof(n1->in_ndst.na_addr))) 8286 return 7; 8287 if (n1->in_nsrc.na_atype != n2->in_nsrc.na_atype) 8288 return 8; 8289 if (n1->in_nsrc.na_function != n2->in_nsrc.na_function) 8290 return 9; 8291 if (bcmp((char *)&n1->in_nsrc.na_addr, (char *)&n2->in_nsrc.na_addr, 8292 sizeof(n1->in_nsrc.na_addr))) 8293 return 10; 8294 if (n1->in_odst.na_atype != n2->in_odst.na_atype) 8295 return 11; 8296 if (n1->in_odst.na_function != n2->in_odst.na_function) 8297 return 12; 8298 if (bcmp((char *)&n1->in_odst.na_addr, (char *)&n2->in_odst.na_addr, 8299 sizeof(n1->in_odst.na_addr))) 8300 return 13; 8301 if (n1->in_osrc.na_atype != n2->in_osrc.na_atype) 8302 return 14; 8303 if (n1->in_osrc.na_function != n2->in_osrc.na_function) 8304 return 15; 8305 if (bcmp((char *)&n1->in_osrc.na_addr, (char *)&n2->in_osrc.na_addr, 8306 sizeof(n1->in_osrc.na_addr))) 8307 return 16; 8308 return 0; 8309 } 8310 8311 8312 /* ------------------------------------------------------------------------ */ 8313 /* Function: ipf_nat_rule_init */ 8314 /* Returns: int - 0 == success, else rules do not match. */ 8315 /* Parameters: softc(I) - pointer to soft context main structure */ 8316 /* softn(I) - pointer to NAT context structure */ 8317 /* n(I) - first rule to compare */ 8318 /* */ 8319 /* ------------------------------------------------------------------------ */ 8320 static int 8321 ipf_nat_rule_init(ipf_main_softc_t *softc, ipf_nat_softc_t *softn, ipnat_t *n) 8322 { 8323 int error = 0; 8324 8325 if ((n->in_flags & IPN_SIPRANGE) != 0) 8326 n->in_nsrcatype = FRI_RANGE; 8327 8328 if ((n->in_flags & IPN_DIPRANGE) != 0) 8329 n->in_ndstatype = FRI_RANGE; 8330 8331 if ((n->in_flags & IPN_SPLIT) != 0) 8332 n->in_ndstatype = FRI_SPLIT; 8333 8334 if ((n->in_redir & (NAT_MAP|NAT_REWRITE|NAT_DIVERTUDP)) != 0) 8335 n->in_spnext = n->in_spmin; 8336 8337 if ((n->in_redir & (NAT_REWRITE|NAT_DIVERTUDP)) != 0) { 8338 n->in_dpnext = n->in_dpmin; 8339 } else if (n->in_redir == NAT_REDIRECT) { 8340 n->in_dpnext = n->in_dpmin; 8341 } 8342 8343 n->in_stepnext = 0; 8344 8345 switch (n->in_v[0]) 8346 { 8347 case 4 : 8348 error = ipf_nat_ruleaddrinit(softc, softn, n); 8349 if (error != 0) 8350 return error; 8351 break; 8352 #ifdef USE_INET6 8353 case 6 : 8354 error = ipf_nat6_ruleaddrinit(softc, softn, n); 8355 if (error != 0) 8356 return error; 8357 break; 8358 #endif 8359 default : 8360 break; 8361 } 8362 8363 if (n->in_redir == (NAT_DIVERTUDP|NAT_MAP)) { 8364 /* 8365 * Prerecord whether or not the destination of the divert 8366 * is local or not to the interface the packet is going 8367 * to be sent out. 8368 */ 8369 n->in_dlocal = ipf_deliverlocal(softc, n->in_v[1], 8370 n->in_ifps[1], &n->in_ndstip6); 8371 } 8372 8373 return error; 8374 } 8375 8376 8377 /* ------------------------------------------------------------------------ */ 8378 /* Function: ipf_nat_rule_fini */ 8379 /* Returns: int - 0 == success, else rules do not match. */ 8380 /* Parameters: softc(I) - pointer to soft context main structure */ 8381 /* n(I) - rule to work on */ 8382 /* */ 8383 /* This function is used to release any objects that were referenced during */ 8384 /* the rule initialisation. This is useful both when free'ing the rule and */ 8385 /* when handling ioctls that need to initialise these fields but not */ 8386 /* actually use them after the ioctl processing has finished. */ 8387 /* ------------------------------------------------------------------------ */ 8388 static void 8389 ipf_nat_rule_fini(ipf_main_softc_t *softc, ipnat_t *n) 8390 { 8391 if (n->in_odst.na_atype == FRI_LOOKUP && n->in_odst.na_ptr != NULL) 8392 ipf_lookup_deref(softc, n->in_odst.na_type, n->in_odst.na_ptr); 8393 8394 if (n->in_osrc.na_atype == FRI_LOOKUP && n->in_osrc.na_ptr != NULL) 8395 ipf_lookup_deref(softc, n->in_osrc.na_type, n->in_osrc.na_ptr); 8396 8397 if (n->in_ndst.na_atype == FRI_LOOKUP && n->in_ndst.na_ptr != NULL) 8398 ipf_lookup_deref(softc, n->in_ndst.na_type, n->in_ndst.na_ptr); 8399 8400 if (n->in_nsrc.na_atype == FRI_LOOKUP && n->in_nsrc.na_ptr != NULL) 8401 ipf_lookup_deref(softc, n->in_nsrc.na_type, n->in_nsrc.na_ptr); 8402 8403 if (n->in_divmp != NULL) 8404 FREE_MB_T(n->in_divmp); 8405 } 8406
Indexes created Sun Sep 28 12:09:53 GMT 2025