fil.c revision 60944
1/* 2 * Copyright (C) 1993-2000 by Darren Reed. 3 * 4 * Redistribution and use in source and binary forms are permitted 5 * provided that this notice is preserved and due credit is given 6 * to the original author and the contributors. 7 */ 8#if !defined(lint) 9static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-1996 Darren Reed"; 10/* static const char rcsid[] = "@(#)$Id: fil.c,v 2.3.2.16 2000/01/27 08:49:37 darrenr Exp $"; */ 11static const char rcsid[] = "@(#)$FreeBSD: head/sys/contrib/ipfilter/netinet/fil.c 60944 2000-05-26 07:28:03Z darrenr $"; 12#endif 13 14#if defined(_KERNEL) && defined(__FreeBSD_version) && \ 15 (__FreeBSD_version >= 400019) 16# define CSUM_DELAY_DATA 17#endif 18#if defined(_KERNEL) && defined(__FreeBSD_version) && \ 19 (__FreeBSD_version >= 400000) && !defined(KLD_MODULE) 20#include "opt_inet6.h" 21#endif 22#include <sys/errno.h> 23#include <sys/types.h> 24#include <sys/param.h> 25#include <sys/time.h> 26#include <sys/file.h> 27#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \ 28 defined(_KERNEL) 29# include "opt_ipfilter_log.h" 30#endif 31#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \ 32 (__FreeBSD_version >= 220000) 33# include <sys/filio.h> 34# include <sys/fcntl.h> 35#else 36# include <sys/ioctl.h> 37#endif 38#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux) 39# include <sys/systm.h> 40#else 41# include <stdio.h> 42# include <string.h> 43# include <stdlib.h> 44#endif 45#include <sys/uio.h> 46#if !defined(__SVR4) && !defined(__svr4__) 47# ifndef linux 48# include <sys/mbuf.h> 49# endif 50#else 51# include <sys/byteorder.h> 52# if SOLARIS2 < 5 53# include <sys/dditypes.h> 54# endif 55# include <sys/stream.h> 56#endif 57#ifndef linux 58# include <sys/protosw.h> 59# include <sys/socket.h> 60#endif 61#include <net/if.h> 62#ifdef sun 63# include <net/af.h> 64#endif 65#include <net/route.h> 66#include <netinet/in.h> 67#include <netinet/in_systm.h> 68#include <netinet/ip.h> 69#ifndef linux 70# include <netinet/ip_var.h> 71#endif 72#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */ 73# include <sys/hashing.h> 74# include <netinet/in_var.h> 75#endif 76#include <netinet/tcp.h> 77#include <netinet/udp.h> 78#include <netinet/ip_icmp.h> 79#include "netinet/ip_compat.h" 80#ifdef USE_INET6 81# include <netinet/icmp6.h> 82# if !SOLARIS && defined(_KERNEL) 83# include <netinet6/in6_var.h> 84# endif 85#endif 86#include <netinet/tcpip.h> 87#include "netinet/ip_fil.h" 88#include "netinet/ip_proxy.h" 89#include "netinet/ip_nat.h" 90#include "netinet/ip_frag.h" 91#include "netinet/ip_state.h" 92#include "netinet/ip_auth.h" 93# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 94# include <sys/malloc.h> 95# if defined(_KERNEL) && !defined(IPFILTER_LKM) 96# include "opt_ipfilter.h" 97# endif 98# endif 99#ifndef MIN 100# define MIN(a,b) (((a)<(b))?(a):(b)) 101#endif 102#include "netinet/ipl.h" 103 104#include <machine/in_cksum.h> 105 106#ifndef _KERNEL 107# include "ipf.h" 108# include "ipt.h" 109extern int opts; 110 111# define FR_VERBOSE(verb_pr) verbose verb_pr 112# define FR_DEBUG(verb_pr) debug verb_pr 113# define IPLLOG(a, c, d, e) ipllog() 114#else /* #ifndef _KERNEL */ 115# define FR_VERBOSE(verb_pr) 116# define FR_DEBUG(verb_pr) 117# define IPLLOG(a, c, d, e) ipflog(a, c, d, e) 118# if SOLARIS || defined(__sgi) 119extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat; 120extern kmutex_t ipf_rw; 121# endif 122# if SOLARIS 123# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, \ 124 ip, qif) 125# define SEND_RESET(ip, qif, if, fin) send_reset(fin, ip, qif) 126# else /* SOLARIS */ 127# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, ip) 128# define SEND_RESET(ip, qif, if, fin) send_reset(fin, ip) 129# endif /* SOLARIS || __sgi */ 130#endif /* _KERNEL */ 131 132 133struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}}; 134struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } }, 135#ifdef USE_INET6 136 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } }, 137 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } }, 138#endif 139 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } }; 140struct frgroup *ipfgroups[3][2]; 141int fr_flags = IPF_LOGGING; 142int fr_active = 0; 143int fr_chksrc = 0; 144#if defined(IPFILTER_DEFAULT_BLOCK) 145int fr_pass = FR_NOMATCH|FR_BLOCK; 146#else 147int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH); 148#endif 149char ipfilter_version[] = IPL_VERSION; 150 151fr_info_t frcache[2]; 152 153static int frflushlist __P((int, minor_t, int *, frentry_t **)); 154#ifdef _KERNEL 155static void frsynclist __P((frentry_t *)); 156#endif 157 158 159/* 160 * bit values for identifying presence of individual IP options 161 */ 162struct optlist ipopts[20] = { 163 { IPOPT_NOP, 0x000001 }, 164 { IPOPT_RR, 0x000002 }, 165 { IPOPT_ZSU, 0x000004 }, 166 { IPOPT_MTUP, 0x000008 }, 167 { IPOPT_MTUR, 0x000010 }, 168 { IPOPT_ENCODE, 0x000020 }, 169 { IPOPT_TS, 0x000040 }, 170 { IPOPT_TR, 0x000080 }, 171 { IPOPT_SECURITY, 0x000100 }, 172 { IPOPT_LSRR, 0x000200 }, 173 { IPOPT_E_SEC, 0x000400 }, 174 { IPOPT_CIPSO, 0x000800 }, 175 { IPOPT_SATID, 0x001000 }, 176 { IPOPT_SSRR, 0x002000 }, 177 { IPOPT_ADDEXT, 0x004000 }, 178 { IPOPT_VISA, 0x008000 }, 179 { IPOPT_IMITD, 0x010000 }, 180 { IPOPT_EIP, 0x020000 }, 181 { IPOPT_FINN, 0x040000 }, 182 { 0, 0x000000 } 183}; 184 185/* 186 * bit values for identifying presence of individual IP security options 187 */ 188struct optlist secopt[8] = { 189 { IPSO_CLASS_RES4, 0x01 }, 190 { IPSO_CLASS_TOPS, 0x02 }, 191 { IPSO_CLASS_SECR, 0x04 }, 192 { IPSO_CLASS_RES3, 0x08 }, 193 { IPSO_CLASS_CONF, 0x10 }, 194 { IPSO_CLASS_UNCL, 0x20 }, 195 { IPSO_CLASS_RES2, 0x40 }, 196 { IPSO_CLASS_RES1, 0x80 } 197}; 198 199 200/* 201 * compact the IP header into a structure which contains just the info. 202 * which is useful for comparing IP headers with. 203 */ 204void fr_makefrip(hlen, ip, fin) 205int hlen; 206ip_t *ip; 207fr_info_t *fin; 208{ 209 u_short optmsk = 0, secmsk = 0, auth = 0; 210 int i, mv, ol, off, p, plen, v; 211 fr_ip_t *fi = &fin->fin_fi; 212 struct optlist *op; 213 u_char *s, opt; 214 tcphdr_t *tcp; 215 216 fin->fin_rev = 0; 217 fin->fin_fr = NULL; 218 fin->fin_tcpf = 0; 219 fin->fin_data[0] = 0; 220 fin->fin_data[1] = 0; 221 fin->fin_rule = -1; 222 fin->fin_group = -1; 223#ifdef _KERNEL 224 fin->fin_icode = ipl_unreach; 225#endif 226 v = fin->fin_v; 227 fi->fi_v = v; 228 fin->fin_hlen = hlen; 229 if (v == 4) { 230 fin->fin_id = ip->ip_id; 231 fi->fi_tos = ip->ip_tos; 232 off = (ip->ip_off & IP_OFFMASK) << 3; 233 tcp = (tcphdr_t *)((char *)ip + hlen); 234 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4)); 235 fi->fi_src.i6[1] = 0; 236 fi->fi_src.i6[2] = 0; 237 fi->fi_src.i6[3] = 0; 238 fi->fi_dst.i6[1] = 0; 239 fi->fi_dst.i6[2] = 0; 240 fi->fi_dst.i6[3] = 0; 241 fi->fi_saddr = ip->ip_src.s_addr; 242 fi->fi_daddr = ip->ip_dst.s_addr; 243 p = ip->ip_p; 244 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0; 245 if (ip->ip_off & 0x3fff) 246 fi->fi_fl |= FI_FRAG; 247 plen = ip->ip_len; 248 fin->fin_dlen = plen - hlen; 249 } 250#ifdef USE_INET6 251 else if (v == 6) { 252 ip6_t *ip6 = (ip6_t *)ip; 253 254 off = 0; 255 p = ip6->ip6_nxt; 256 fi->fi_p = p; 257 fi->fi_ttl = ip6->ip6_hlim; 258 tcp = (tcphdr_t *)(ip6 + 1); 259 fi->fi_src.in6 = ip6->ip6_src; 260 fi->fi_dst.in6 = ip6->ip6_dst; 261 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff); 262 fi->fi_tos = 0; 263 fi->fi_fl = 0; 264 plen = ntohs(ip6->ip6_plen); 265 fin->fin_dlen = plen; 266 } 267#endif 268 else 269 return; 270 271 fin->fin_off = off; 272 fin->fin_plen = plen; 273 fin->fin_dp = (void *)tcp; 274 275 switch (p) 276 { 277 case IPPROTO_ICMP : 278 { 279 int minicmpsz = sizeof(struct icmp); 280 icmphdr_t *icmp; 281 282 icmp = (icmphdr_t *)tcp; 283 284 if (!off && (icmp->icmp_type == ICMP_ECHOREPLY || 285 icmp->icmp_type == ICMP_ECHO)) 286 minicmpsz = ICMP_MINLEN; 287 288 /* type(1) + code(1) + cksum(2) + id(2) seq(2) + 289 * 3*timestamp(3*4) */ 290 else if (!off && (icmp->icmp_type == ICMP_TSTAMP || 291 icmp->icmp_type == ICMP_TSTAMPREPLY)) 292 minicmpsz = 20; 293 294 /* type(1) + code(1) + cksum(2) + id(2) seq(2) + mask(4) */ 295 else if (!off && (icmp->icmp_type == ICMP_MASKREQ || 296 icmp->icmp_type == ICMP_MASKREPLY)) 297 minicmpsz = 12; 298 299 if ((!(plen >= hlen + minicmpsz) && !off) || 300 (off && off < sizeof(struct icmp))) 301 fi->fi_fl |= FI_SHORT; 302 if (fin->fin_dlen > 1) 303 fin->fin_data[0] = *(u_short *)tcp; 304 break; 305 } 306 case IPPROTO_TCP : 307 fi->fi_fl |= FI_TCPUDP; 308#ifdef USE_INET6 309 if (v == 6) { 310 if (plen < sizeof(struct tcphdr)) 311 fi->fi_fl |= FI_SHORT; 312 } else 313#endif 314 if (v == 4) { 315 if ((!IPMINLEN(ip, tcphdr) && !off) || 316 (off && off < sizeof(struct tcphdr))) 317 fi->fi_fl |= FI_SHORT; 318 } 319 if (!(fi->fi_fl & FI_SHORT) && !off) 320 fin->fin_tcpf = tcp->th_flags; 321 goto getports; 322 case IPPROTO_UDP : 323 fi->fi_fl |= FI_TCPUDP; 324#ifdef USE_INET6 325 if (v == 6) { 326 if (plen < sizeof(struct udphdr)) 327 fi->fi_fl |= FI_SHORT; 328 } else 329#endif 330 if (v == 4) { 331 if ((!IPMINLEN(ip, udphdr) && !off) || 332 (off && off < sizeof(struct udphdr))) 333 fi->fi_fl |= FI_SHORT; 334 } 335getports: 336 if (!off && (fin->fin_dlen > 3)) { 337 fin->fin_data[0] = ntohs(tcp->th_sport); 338 fin->fin_data[1] = ntohs(tcp->th_dport); 339 } 340 break; 341 default : 342 break; 343 } 344 345#ifdef USE_INET6 346 if (v == 6) { 347 fi->fi_optmsk = 0; 348 fi->fi_secmsk = 0; 349 fi->fi_auth = 0; 350 return; 351 } 352#endif 353 354 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) { 355 opt = *s; 356 if (opt == '\0') 357 break; 358 else if (opt == IPOPT_NOP) 359 ol = 1; 360 else { 361 if (hlen < 2) 362 break; 363 ol = (int)*(s + 1); 364 if (ol < 2 || ol > hlen) 365 break; 366 } 367 for (i = 9, mv = 4; mv >= 0; ) { 368 op = ipopts + i; 369 if (opt == (u_char)op->ol_val) { 370 optmsk |= op->ol_bit; 371 if (opt == IPOPT_SECURITY) { 372 struct optlist *sp; 373 u_char sec; 374 int j, m; 375 376 sec = *(s + 2); /* classification */ 377 for (j = 3, m = 2; m >= 0; ) { 378 sp = secopt + j; 379 if (sec == sp->ol_val) { 380 secmsk |= sp->ol_bit; 381 auth = *(s + 3); 382 auth *= 256; 383 auth += *(s + 4); 384 break; 385 } 386 if (sec < sp->ol_val) 387 j -= m--; 388 else 389 j += m--; 390 } 391 } 392 break; 393 } 394 if (opt < op->ol_val) 395 i -= mv--; 396 else 397 i += mv--; 398 } 399 hlen -= ol; 400 s += ol; 401 } 402 if (auth && !(auth & 0x0100)) 403 auth &= 0xff00; 404 fi->fi_optmsk = optmsk; 405 fi->fi_secmsk = secmsk; 406 fi->fi_auth = auth; 407} 408 409 410/* 411 * check an IP packet for TCP/UDP characteristics such as ports and flags. 412 */ 413int fr_tcpudpchk(ft, fin) 414frtuc_t *ft; 415fr_info_t *fin; 416{ 417 register u_short po, tup; 418 register char i; 419 register int err = 1; 420 421 /* 422 * Both ports should *always* be in the first fragment. 423 * So far, I cannot find any cases where they can not be. 424 * 425 * compare destination ports 426 */ 427 if ((i = (int)ft->ftu_dcmp)) { 428 po = ft->ftu_dport; 429 tup = fin->fin_data[1]; 430 /* 431 * Do opposite test to that required and 432 * continue if that succeeds. 433 */ 434 if (!--i && tup != po) /* EQUAL */ 435 err = 0; 436 else if (!--i && tup == po) /* NOTEQUAL */ 437 err = 0; 438 else if (!--i && tup >= po) /* LESSTHAN */ 439 err = 0; 440 else if (!--i && tup <= po) /* GREATERTHAN */ 441 err = 0; 442 else if (!--i && tup > po) /* LT or EQ */ 443 err = 0; 444 else if (!--i && tup < po) /* GT or EQ */ 445 err = 0; 446 else if (!--i && /* Out of range */ 447 (tup >= po && tup <= ft->ftu_dtop)) 448 err = 0; 449 else if (!--i && /* In range */ 450 (tup <= po || tup >= ft->ftu_dtop)) 451 err = 0; 452 } 453 /* 454 * compare source ports 455 */ 456 if (err && (i = (int)ft->ftu_scmp)) { 457 po = ft->ftu_sport; 458 tup = fin->fin_data[0]; 459 if (!--i && tup != po) 460 err = 0; 461 else if (!--i && tup == po) 462 err = 0; 463 else if (!--i && tup >= po) 464 err = 0; 465 else if (!--i && tup <= po) 466 err = 0; 467 else if (!--i && tup > po) 468 err = 0; 469 else if (!--i && tup < po) 470 err = 0; 471 else if (!--i && /* Out of range */ 472 (tup >= po && tup <= ft->ftu_stop)) 473 err = 0; 474 else if (!--i && /* In range */ 475 (tup <= po || tup >= ft->ftu_stop)) 476 err = 0; 477 } 478 479 /* 480 * If we don't have all the TCP/UDP header, then how can we 481 * expect to do any sort of match on it ? If we were looking for 482 * TCP flags, then NO match. If not, then match (which should 483 * satisfy the "short" class too). 484 */ 485 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) { 486 if (fin->fin_fi.fi_fl & FI_SHORT) 487 return !(ft->ftu_tcpf | ft->ftu_tcpfm); 488 /* 489 * Match the flags ? If not, abort this match. 490 */ 491 if (ft->ftu_tcpfm && 492 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) { 493 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf, 494 ft->ftu_tcpfm, ft->ftu_tcpf)); 495 err = 0; 496 } 497 } 498 return err; 499} 500 501/* 502 * Check the input/output list of rules for a match and result. 503 * Could be per interface, but this gets real nasty when you don't have 504 * kernel sauce. 505 */ 506int fr_scanlist(pass, ip, fin, m) 507u_32_t pass; 508ip_t *ip; 509register fr_info_t *fin; 510void *m; 511{ 512 register struct frentry *fr; 513 register fr_ip_t *fi = &fin->fin_fi; 514 int rulen, portcmp = 0, off, skip = 0, logged = 0; 515 u_32_t passt; 516 517 fr = fin->fin_fr; 518 fin->fin_fr = NULL; 519 fin->fin_rule = 0; 520 fin->fin_group = 0; 521 if (fin->fin_v == 4) 522 off = ip->ip_off & IP_OFFMASK; 523 else 524 off = 0; 525 pass |= (fi->fi_fl << 24); 526 527 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off) 528 portcmp = 1; 529 530 for (rulen = 0; fr; fr = fr->fr_next, rulen++) { 531 if (skip) { 532 skip--; 533 continue; 534 } 535 /* 536 * In all checks below, a null (zero) value in the 537 * filter struture is taken to mean a wildcard. 538 * 539 * check that we are working for the right interface 540 */ 541#ifdef _KERNEL 542# if BSD >= 199306 543 if (fin->fin_out != 0) { 544 if ((fr->fr_oifa && 545 fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif) || 546 (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)) 547 continue; 548 } else 549# endif 550 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) 551 continue; 552#else 553 if (opts & (OPT_VERBOSE|OPT_DEBUG)) 554 printf("\n"); 555 FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' : 556 (pass & FR_AUTH) ? 'a' : 'b')); 557 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) 558 continue; 559 FR_VERBOSE((":i")); 560#endif 561 { 562 register u_32_t *ld, *lm, *lip; 563 register int i; 564 565 lip = (u_32_t *)fi; 566 lm = (u_32_t *)&fr->fr_mip; 567 ld = (u_32_t *)&fr->fr_ip; 568 i = ((*lip & *lm) != *ld); 569 FR_DEBUG(("0. %#08x & %#08x != %#08x\n", 570 *lip, *lm, *ld)); 571 if (i) 572 continue; 573 /* 574 * We now know whether the packet version and the 575 * rule version match, along with protocol, ttl and 576 * tos. 577 */ 578 lip++, lm++, ld++; 579 /* 580 * Unrolled loops (4 each, for 32 bits). 581 */ 582 i |= ((*lip & *lm) != *ld) << 19; 583 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n", 584 *lip, *lm, *ld)); 585 if (fi->fi_v == 6) { 586 lip++, lm++, ld++; 587 i |= ((*lip & *lm) != *ld) << 19; 588 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n", 589 *lip, *lm, *ld)); 590 lip++, lm++, ld++; 591 i |= ((*lip & *lm) != *ld) << 19; 592 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n", 593 *lip, *lm, *ld)); 594 lip++, lm++, ld++; 595 i |= ((*lip & *lm) != *ld) << 19; 596 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n", 597 *lip, *lm, *ld)); 598 } else { 599 lip += 3; 600 lm += 3; 601 ld += 3; 602 } 603 i ^= (fr->fr_flags & FR_NOTSRCIP); 604 if (i) 605 continue; 606 lip++, lm++, ld++; 607 i |= ((*lip & *lm) != *ld) << 20; 608 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n", 609 *lip, *lm, *ld)); 610 if (fi->fi_v == 6) { 611 lip++, lm++, ld++; 612 i |= ((*lip & *lm) != *ld) << 20; 613 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n", 614 *lip, *lm, *ld)); 615 lip++, lm++, ld++; 616 i |= ((*lip & *lm) != *ld) << 20; 617 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n", 618 *lip, *lm, *ld)); 619 lip++, lm++, ld++; 620 i |= ((*lip & *lm) != *ld) << 20; 621 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n", 622 *lip, *lm, *ld)); 623 } else { 624 lip += 3; 625 lm += 3; 626 ld += 3; 627 } 628 i ^= (fr->fr_flags & FR_NOTDSTIP); 629 if (i) 630 continue; 631 lip++, lm++, ld++; 632 i |= ((*lip & *lm) != *ld); 633 FR_DEBUG(("3. %#08x & %#08x != %#08x\n", 634 *lip, *lm, *ld)); 635 lip++, lm++, ld++; 636 i |= ((*lip & *lm) != *ld); 637 FR_DEBUG(("4. %#08x & %#08x != %#08x\n", 638 *lip, *lm, *ld)); 639 if (i) 640 continue; 641 } 642 643 /* 644 * If a fragment, then only the first has what we're looking 645 * for here... 646 */ 647 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf || 648 fr->fr_tcpfm)) 649 continue; 650 if (fi->fi_fl & FI_TCPUDP) { 651 if (!fr_tcpudpchk(&fr->fr_tuc, fin)) 652 continue; 653 } else if (fr->fr_icmpm || fr->fr_icmp) { 654 if ((fi->fi_p != IPPROTO_ICMP) || off || 655 (fin->fin_dlen < 2)) 656 continue; 657 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) { 658 FR_DEBUG(("i. %#x & %#x != %#x\n", 659 fin->fin_data[0], fr->fr_icmpm, 660 fr->fr_icmp)); 661 continue; 662 } 663 } 664 FR_VERBOSE(("*")); 665 /* 666 * Just log this packet... 667 */ 668 passt = fr->fr_flags; 669 if ((passt & FR_CALLNOW) && fr->fr_func) 670 passt = (*fr->fr_func)(passt, ip, fin); 671 fin->fin_fr = fr; 672#ifdef IPFILTER_LOG 673 if ((passt & FR_LOGMASK) == FR_LOG) { 674 if (!IPLLOG(passt, ip, fin, m)) { 675 if (passt & FR_LOGORBLOCK) 676 passt |= FR_BLOCK|FR_QUICK; 677 ATOMIC_INCL(frstats[fin->fin_out].fr_skip); 678 } 679 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl); 680 logged = 1; 681 } 682#endif /* IPFILTER_LOG */ 683 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG) 684 pass = passt; 685 FR_DEBUG(("pass %#x\n", pass)); 686 ATOMIC_INCL(fr->fr_hits); 687 if (pass & FR_ACCOUNT) 688 fr->fr_bytes += (U_QUAD_T)ip->ip_len; 689 else 690 fin->fin_icode = fr->fr_icode; 691 fin->fin_rule = rulen; 692 fin->fin_group = fr->fr_group; 693 if (fr->fr_grp) { 694 fin->fin_fr = fr->fr_grp; 695 pass = fr_scanlist(pass, ip, fin, m); 696 if (fin->fin_fr == NULL) { 697 fin->fin_rule = rulen; 698 fin->fin_group = fr->fr_group; 699 fin->fin_fr = fr; 700 } 701 if (pass & FR_DONTCACHE) 702 logged = 1; 703 } 704 if (pass & FR_QUICK) 705 break; 706 } 707 if (logged) 708 pass |= FR_DONTCACHE; 709 return pass; 710} 711 712 713/* 714 * frcheck - filter check 715 * check using source and destination addresses/ports in a packet whether 716 * or not to pass it on or not. 717 */ 718int fr_check(ip, hlen, ifp, out 719#if defined(_KERNEL) && SOLARIS 720, qif, mp) 721qif_t *qif; 722#else 723, mp) 724#endif 725mb_t **mp; 726ip_t *ip; 727int hlen; 728void *ifp; 729int out; 730{ 731 /* 732 * The above really sucks, but short of writing a diff 733 */ 734 fr_info_t frinfo, *fc; 735 register fr_info_t *fin = &frinfo; 736 int changed, error = EHOSTUNREACH, v = ip->ip_v; 737 frentry_t *fr = NULL, *list; 738 u_32_t pass, apass; 739#if !SOLARIS || !defined(_KERNEL) 740 register mb_t *m = *mp; 741#endif 742 743#ifdef _KERNEL 744 mb_t *mc = NULL; 745# if !defined(__SVR4) && !defined(__svr4__) 746# ifdef __sgi 747 char hbuf[(0xf << 2) + sizeof(struct icmp) + sizeof(ip_t) + 8]; 748# endif 749 int up; 750 751# ifdef M_CANFASTFWD 752 /* 753 * XXX For now, IP Filter and fast-forwarding of cached flows 754 * XXX are mutually exclusive. Eventually, IP Filter should 755 * XXX get a "can-fast-forward" filter rule. 756 */ 757 m->m_flags &= ~M_CANFASTFWD; 758# endif /* M_CANFASTFWD */ 759# ifdef CSUM_DELAY_DATA 760 /* 761 * disable delayed checksums. 762 */ 763 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 764 in_delayed_cksum(m); 765 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 766 } 767# endif /* CSUM_DELAY_DATA */ 768 769 770 if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP || 771 ip->ip_p == IPPROTO_ICMP)) { 772 int plen = 0; 773 774 if ((ip->ip_off & IP_OFFMASK) == 0) 775 switch(ip->ip_p) 776 { 777 case IPPROTO_TCP: 778 plen = sizeof(tcphdr_t); 779 break; 780 case IPPROTO_UDP: 781 plen = sizeof(udphdr_t); 782 break; 783 /* 96 - enough for complete ICMP error IP header */ 784 case IPPROTO_ICMP: 785 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t); 786 break; 787 } 788 up = MIN(hlen + plen, ip->ip_len); 789 790 if (up > m->m_len) { 791# ifdef __sgi 792 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */ 793 if ((up > sizeof(hbuf)) || (m_length(m) < up)) { 794 ATOMIC_INCL(frstats[out].fr_pull[1]); 795 return -1; 796 } 797 m_copydata(m, 0, up, hbuf); 798 ATOMIC_INCL(frstats[out].fr_pull[0]); 799 ip = (ip_t *)hbuf; 800# else /* __ sgi */ 801# ifndef linux 802 if ((*mp = m_pullup(m, up)) == 0) { 803 ATOMIC_INCL(frstats[out].fr_pull[1]); 804 return -1; 805 } else { 806 ATOMIC_INCL(frstats[out].fr_pull[0]); 807 m = *mp; 808 ip = mtod(m, ip_t *); 809 } 810# endif /* !linux */ 811# endif /* __sgi */ 812 } else 813 up = 0; 814 } else 815 up = 0; 816# endif /* !defined(__SVR4) && !defined(__svr4__) */ 817# if SOLARIS 818 mb_t *m = qif->qf_m; 819 820 if ((u_int)ip & 0x3) 821 return 2; 822 fin->fin_qfm = m; 823 fin->fin_qif = qif; 824# endif 825# ifdef USE_INET6 826 if (v == 6) { 827 ATOMIC_INCL(frstats[0].fr_ipv6[out]); 828 } else 829# endif 830 if (!out && fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) { 831 ATOMIC_INCL(frstats[0].fr_badsrc); 832# if !SOLARIS 833 m_freem(m); 834# endif 835 return error; 836 } 837#endif /* _KERNEL */ 838 839 /* 840 * Be careful here: ip_id is in network byte order when called 841 * from ip_output() 842 */ 843 if ((out) && (v == 4)) 844 ip->ip_id = ntohs(ip->ip_id); 845 846 changed = 0; 847 fin->fin_v = v; 848 fin->fin_ifp = ifp; 849 fin->fin_out = out; 850 fin->fin_mp = mp; 851 fr_makefrip(hlen, ip, fin); 852 pass = fr_pass; 853 854 if (fin->fin_fi.fi_fl & FI_SHORT) { 855 ATOMIC_INCL(frstats[out].fr_short); 856 } 857 858 READ_ENTER(&ipf_mutex); 859 860 if (fin->fin_fi.fi_fl & FI_SHORT) 861 ATOMIC_INCL(frstats[out].fr_short); 862 863 /* 864 * Check auth now. This, combined with the check below to see if apass 865 * is 0 is to ensure that we don't count the packet twice, which can 866 * otherwise occur when we reprocess it. As it is, we only count it 867 * after it has no auth. table matchup. This also stops NAT from 868 * occuring until after the packet has been auth'd. 869 */ 870 apass = fr_checkauth(ip, fin); 871 872 if (!out) { 873#ifdef USE_INET6 874 if (v == 6) 875 list = ipacct6[0][fr_active]; 876 else 877#endif 878 list = ipacct[0][fr_active]; 879 changed = ip_natin(ip, fin); 880 if (!apass && (fin->fin_fr = list) && 881 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) { 882 ATOMIC_INCL(frstats[0].fr_acct); 883 } 884 } 885 886 if (apass || (!(fr = ipfr_knownfrag(ip, fin)) && 887 !(fr = fr_checkstate(ip, fin)))) { 888 /* 889 * If a packet is found in the auth table, then skip checking 890 * the access lists for permission but we do need to consider 891 * the result as if it were from the ACL's. 892 */ 893 if (!apass) { 894 fc = frcache + out; 895 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) { 896 /* 897 * copy cached data so we can unlock the mutex 898 * earlier. 899 */ 900 bcopy((char *)fc, (char *)fin, FI_COPYSIZE); 901 ATOMIC_INCL(frstats[out].fr_chit); 902 if ((fr = fin->fin_fr)) { 903 ATOMIC_INCL(fr->fr_hits); 904 pass = fr->fr_flags; 905 } 906 } else { 907#ifdef USE_INET6 908 if (v == 6) 909 list = ipfilter6[out][fr_active]; 910 else 911#endif 912 list = ipfilter[out][fr_active]; 913 if ((fin->fin_fr = list)) 914 pass = fr_scanlist(fr_pass, ip, fin, m); 915 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE))) 916 bcopy((char *)fin, (char *)fc, 917 FI_COPYSIZE); 918 if (pass & FR_NOMATCH) { 919 ATOMIC_INCL(frstats[out].fr_nom); 920 } 921 } 922 fr = fin->fin_fr; 923 } else 924 pass = apass; 925 926 /* 927 * If we fail to add a packet to the authorization queue, 928 * then we drop the packet later. However, if it was added 929 * then pretend we've dropped it already. 930 */ 931 if ((pass & FR_AUTH)) 932 if (fr_newauth((mb_t *)m, fin, ip) != 0) 933#ifdef _KERNEL 934 m = *mp = NULL; 935#else 936 ; 937#endif 938 939 if (pass & FR_PREAUTH) { 940 READ_ENTER(&ipf_auth); 941 if ((fin->fin_fr = ipauth) && 942 (pass = fr_scanlist(0, ip, fin, m))) { 943 ATOMIC_INCL(fr_authstats.fas_hits); 944 } else { 945 ATOMIC_INCL(fr_authstats.fas_miss); 946 } 947 RWLOCK_EXIT(&ipf_auth); 948 } 949 950 fin->fin_fr = fr; 951 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) { 952 if (fin->fin_fi.fi_fl & FI_FRAG) { 953 if (ipfr_newfrag(ip, fin, pass) == -1) { 954 ATOMIC_INCL(frstats[out].fr_bnfr); 955 } else { 956 ATOMIC_INCL(frstats[out].fr_nfr); 957 } 958 } else { 959 ATOMIC_INCL(frstats[out].fr_cfr); 960 } 961 } 962 if (pass & FR_KEEPSTATE) { 963 if (fr_addstate(ip, fin, 0) == NULL) { 964 ATOMIC_INCL(frstats[out].fr_bads); 965 } else { 966 ATOMIC_INCL(frstats[out].fr_ads); 967 } 968 } 969 } else if (fr != NULL) { 970 pass = fr->fr_flags; 971 if (pass & FR_LOGFIRST) 972 pass &= ~(FR_LOGFIRST|FR_LOG); 973 } 974 975 if (fr && fr->fr_func && !(pass & FR_CALLNOW)) 976 pass = (*fr->fr_func)(pass, ip, fin); 977 978 /* 979 * Only count/translate packets which will be passed on, out the 980 * interface. 981 */ 982 if (out && (pass & FR_PASS)) { 983#ifdef USE_INET6 984 if (v == 6) 985 list = ipacct6[0][fr_active]; 986 else 987#endif 988 list = ipacct[0][fr_active]; 989 if ((fin->fin_fr = list) && 990 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) { 991 ATOMIC_INCL(frstats[1].fr_acct); 992 } 993 fin->fin_fr = fr; 994 changed = ip_natout(ip, fin); 995 } else 996 fin->fin_fr = fr; 997 RWLOCK_EXIT(&ipf_mutex); 998 999#ifdef IPFILTER_LOG 1000 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) { 1001 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) { 1002 pass |= FF_LOGNOMATCH; 1003 ATOMIC_INCL(frstats[out].fr_npkl); 1004 goto logit; 1005 } else if (((pass & FR_LOGMASK) == FR_LOGP) || 1006 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) { 1007 if ((pass & FR_LOGMASK) != FR_LOGP) 1008 pass |= FF_LOGPASS; 1009 ATOMIC_INCL(frstats[out].fr_ppkl); 1010 goto logit; 1011 } else if (((pass & FR_LOGMASK) == FR_LOGB) || 1012 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) { 1013 if ((pass & FR_LOGMASK) != FR_LOGB) 1014 pass |= FF_LOGBLOCK; 1015 ATOMIC_INCL(frstats[out].fr_bpkl); 1016logit: 1017 if (!IPLLOG(pass, ip, fin, m)) { 1018 ATOMIC_INCL(frstats[out].fr_skip); 1019 if ((pass & (FR_PASS|FR_LOGORBLOCK)) == 1020 (FR_PASS|FR_LOGORBLOCK)) 1021 pass ^= FR_PASS|FR_BLOCK; 1022 } 1023 } 1024 } 1025#endif /* IPFILTER_LOG */ 1026 1027 if ((out) && (v == 4)) 1028 ip->ip_id = htons(ip->ip_id); 1029 1030#ifdef _KERNEL 1031 /* 1032 * Only allow FR_DUP to work if a rule matched - it makes no sense to 1033 * set FR_DUP as a "default" as there are no instructions about where 1034 * to send the packet. 1035 */ 1036 if (fr && (pass & FR_DUP)) 1037# if SOLARIS 1038 mc = dupmsg(m); 1039# else 1040# ifndef linux 1041 mc = m_copy(m, 0, M_COPYALL); 1042# else 1043 ; 1044# endif 1045# endif 1046#endif 1047 if (pass & FR_PASS) { 1048 ATOMIC_INCL(frstats[out].fr_pass); 1049 } else if (pass & FR_BLOCK) { 1050 ATOMIC_INCL(frstats[out].fr_block); 1051 /* 1052 * Should we return an ICMP packet to indicate error 1053 * status passing through the packet filter ? 1054 * WARNING: ICMP error packets AND TCP RST packets should 1055 * ONLY be sent in repsonse to incoming packets. Sending them 1056 * in response to outbound packets can result in a panic on 1057 * some operating systems. 1058 */ 1059 if (!out) { 1060#ifdef _KERNEL 1061 if (pass & FR_RETICMP) { 1062 int dst; 1063 1064 if ((pass & FR_RETMASK) == FR_FAKEICMP) 1065 dst = 1; 1066 else 1067 dst = 0; 1068 send_icmp_err(ip, ICMP_UNREACH, fin, dst); 1069 ATOMIC_INCL(frstats[0].fr_ret); 1070 } else if (((pass & FR_RETMASK) == FR_RETRST) && 1071 !(fin->fin_fi.fi_fl & FI_SHORT)) { 1072 if (send_reset(ip, fin) == 0) { 1073 ATOMIC_INCL(frstats[1].fr_ret); 1074 } 1075 } 1076#else 1077 if ((pass & FR_RETMASK) == FR_RETICMP) { 1078 verbose("- ICMP unreachable sent\n"); 1079 ATOMIC_INCL(frstats[0].fr_ret); 1080 } else if ((pass & FR_RETMASK) == FR_FAKEICMP) { 1081 verbose("- forged ICMP unreachable sent\n"); 1082 ATOMIC_INCL(frstats[0].fr_ret); 1083 } else if (((pass & FR_RETMASK) == FR_RETRST) && 1084 !(fin->fin_fi.fi_fl & FI_SHORT)) { 1085 verbose("- TCP RST sent\n"); 1086 ATOMIC_INCL(frstats[1].fr_ret); 1087 } 1088#endif 1089 } else { 1090 if (pass & FR_RETRST) 1091 error = ECONNRESET; 1092 } 1093 } 1094 1095 /* 1096 * If we didn't drop off the bottom of the list of rules (and thus 1097 * the 'current' rule fr is not NULL), then we may have some extra 1098 * instructions about what to do with a packet. 1099 * Once we're finished return to our caller, freeing the packet if 1100 * we are dropping it (* BSD ONLY *). 1101 */ 1102 if ((changed == -1) && (pass & FR_PASS)) { 1103 pass &= ~FR_PASS; 1104 pass |= FR_BLOCK; 1105 } 1106#if defined(_KERNEL) 1107# if !SOLARIS 1108# if !defined(linux) 1109 if (fr) { 1110 frdest_t *fdp = &fr->fr_tif; 1111 1112 if (((pass & FR_FASTROUTE) && !out) || 1113 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) { 1114 if (ipfr_fastroute(m, fin, fdp) == 0) 1115 m = *mp = NULL; 1116 } 1117 if (mc) 1118 ipfr_fastroute(mc, fin, &fr->fr_dif); 1119 } 1120 if (!(pass & FR_PASS) && m) 1121 m_freem(m); 1122# ifdef __sgi 1123 else if (changed && up && m) 1124 m_copyback(m, 0, up, hbuf); 1125# endif 1126# endif /* !linux */ 1127# else /* !SOLARIS */ 1128 if (fr) { 1129 frdest_t *fdp = &fr->fr_tif; 1130 1131 if (((pass & FR_FASTROUTE) && !out) || 1132 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) { 1133 if (ipfr_fastroute(qif, ip, m, mp, fin, fdp) == 0) 1134 m = *mp = NULL; 1135 } 1136 if (mc) 1137 ipfr_fastroute(qif, ip, mc, mp, fin, &fr->fr_dif); 1138 } 1139# endif /* !SOLARIS */ 1140 return (pass & FR_PASS) ? 0 : error; 1141#else /* _KERNEL */ 1142 if (pass & FR_NOMATCH) 1143 return 1; 1144 if (pass & FR_PASS) 1145 return 0; 1146 if (pass & FR_AUTH) 1147 return -2; 1148 return -1; 1149#endif /* _KERNEL */ 1150} 1151 1152 1153/* 1154 * ipf_cksum 1155 * addr should be 16bit aligned and len is in bytes. 1156 * length is in bytes 1157 */ 1158u_short ipf_cksum(addr, len) 1159register u_short *addr; 1160register int len; 1161{ 1162 register u_32_t sum = 0; 1163 1164 for (sum = 0; len > 1; len -= 2) 1165 sum += *addr++; 1166 1167 /* mop up an odd byte, if necessary */ 1168 if (len == 1) 1169 sum += *(u_char *)addr; 1170 1171 /* 1172 * add back carry outs from top 16 bits to low 16 bits 1173 */ 1174 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 1175 sum += (sum >> 16); /* add carry */ 1176 return (u_short)(~sum); 1177} 1178 1179 1180/* 1181 * NB: This function assumes we've pullup'd enough for all of the IP header 1182 * and the TCP header. We also assume that data blocks aren't allocated in 1183 * odd sizes. 1184 */ 1185u_short fr_tcpsum(m, ip, tcp) 1186mb_t *m; 1187ip_t *ip; 1188tcphdr_t *tcp; 1189{ 1190 u_short *sp, slen, ts; 1191 u_int sum, sum2; 1192 int hlen; 1193 1194 /* 1195 * Add up IP Header portion 1196 */ 1197 hlen = ip->ip_hl << 2; 1198 slen = ip->ip_len - hlen; 1199 sum = htons((u_short)ip->ip_p); 1200 sum += htons(slen); 1201 sp = (u_short *)&ip->ip_src; 1202 sum += *sp++; /* ip_src */ 1203 sum += *sp++; 1204 sum += *sp++; /* ip_dst */ 1205 sum += *sp++; 1206 ts = tcp->th_sum; 1207 tcp->th_sum = 0; 1208#ifdef KERNEL 1209# if SOLARIS 1210 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */ 1211 sum2 = (sum2 & 0xffff) + (sum2 >> 16); 1212 sum2 = ~sum2 & 0xffff; 1213# else /* SOLARIS */ 1214# if defined(BSD) || defined(sun) 1215# if BSD >= 199306 1216 m->m_data += hlen; 1217# else 1218 m->m_off += hlen; 1219# endif 1220 m->m_len -= hlen; 1221 sum2 = in_cksum(m, slen); 1222 m->m_len += hlen; 1223# if BSD >= 199306 1224 m->m_data -= hlen; 1225# else 1226 m->m_off -= hlen; 1227# endif 1228 /* 1229 * Both sum and sum2 are partial sums, so combine them together. 1230 */ 1231 sum = (sum & 0xffff) + (sum >> 16); 1232 sum = ~sum & 0xffff; 1233 sum2 += sum; 1234 sum2 = (sum2 & 0xffff) + (sum2 >> 16); 1235# else /* defined(BSD) || defined(sun) */ 1236{ 1237 union { 1238 u_char c[2]; 1239 u_short s; 1240 } bytes; 1241 u_short len = ip->ip_len; 1242# if defined(__sgi) 1243 int add; 1244# endif 1245 1246 /* 1247 * Add up IP Header portion 1248 */ 1249 sp = (u_short *)&ip->ip_src; 1250 len -= (ip->ip_hl << 2); 1251 sum = ntohs(IPPROTO_TCP); 1252 sum += htons(len); 1253 sum += *sp++; /* ip_src */ 1254 sum += *sp++; 1255 sum += *sp++; /* ip_dst */ 1256 sum += *sp++; 1257 if (sp != (u_short *)tcp) 1258 sp = (u_short *)tcp; 1259 sum += *sp++; /* sport */ 1260 sum += *sp++; /* dport */ 1261 sum += *sp++; /* seq */ 1262 sum += *sp++; 1263 sum += *sp++; /* ack */ 1264 sum += *sp++; 1265 sum += *sp++; /* off */ 1266 sum += *sp++; /* win */ 1267 sum += *sp++; /* Skip over checksum */ 1268 sum += *sp++; /* urp */ 1269 1270# ifdef __sgi 1271 /* 1272 * In case we had to copy the IP & TCP header out of mbufs, 1273 * skip over the mbuf bits which are the header 1274 */ 1275 if ((caddr_t)ip != mtod(m, caddr_t)) { 1276 hlen = (caddr_t)sp - (caddr_t)ip; 1277 while (hlen) { 1278 add = MIN(hlen, m->m_len); 1279 sp = (u_short *)(mtod(m, caddr_t) + add); 1280 hlen -= add; 1281 if (add == m->m_len) { 1282 m = m->m_next; 1283 if (!hlen) { 1284 if (!m) 1285 break; 1286 sp = mtod(m, u_short *); 1287 } 1288 PANIC((!m),("fr_tcpsum(1): not enough data")); 1289 } 1290 } 1291 } 1292# endif 1293 1294 if (!(len -= sizeof(*tcp))) 1295 goto nodata; 1296 while (len > 1) { 1297 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) { 1298 m = m->m_next; 1299 PANIC((!m),("fr_tcpsum(2): not enough data")); 1300 sp = mtod(m, u_short *); 1301 } 1302 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) { 1303 bytes.c[0] = *(u_char *)sp; 1304 m = m->m_next; 1305 PANIC((!m),("fr_tcpsum(3): not enough data")); 1306 sp = mtod(m, u_short *); 1307 bytes.c[1] = *(u_char *)sp; 1308 sum += bytes.s; 1309 sp = (u_short *)((u_char *)sp + 1); 1310 } 1311 if ((u_long)sp & 1) { 1312 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s)); 1313 sum += bytes.s; 1314 } else 1315 sum += *sp++; 1316 len -= 2; 1317 } 1318 if (len) 1319 sum += ntohs(*(u_char *)sp << 8); 1320nodata: 1321 while (sum > 0xffff) 1322 sum = (sum & 0xffff) + (sum >> 16); 1323 sum2 = (u_short)(~sum & 0xffff); 1324} 1325# endif /* defined(BSD) || defined(sun) */ 1326# endif /* SOLARIS */ 1327#else /* KERNEL */ 1328 sum2 = 0; 1329#endif /* KERNEL */ 1330 tcp->th_sum = ts; 1331 return sum2; 1332} 1333 1334 1335#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) ) 1336/* 1337 * Copyright (c) 1982, 1986, 1988, 1991, 1993 1338 * The Regents of the University of California. All rights reserved. 1339 * 1340 * Redistribution and use in source and binary forms, with or without 1341 * modification, are permitted provided that the following conditions 1342 * are met: 1343 * 1. Redistributions of source code must retain the above copyright 1344 * notice, this list of conditions and the following disclaimer. 1345 * 2. Redistributions in binary form must reproduce the above copyright 1346 * notice, this list of conditions and the following disclaimer in the 1347 * documentation and/or other materials provided with the distribution. 1348 * 3. All advertising materials mentioning features or use of this software 1349 * must display the following acknowledgement: 1350 * This product includes software developed by the University of 1351 * California, Berkeley and its contributors. 1352 * 4. Neither the name of the University nor the names of its contributors 1353 * may be used to endorse or promote products derived from this software 1354 * without specific prior written permission. 1355 * 1356 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1357 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1358 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1359 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 1360 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1361 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 1362 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 1363 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 1364 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 1365 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 1366 * SUCH DAMAGE. 1367 * 1368 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94 1369 * $Id: fil.c,v 2.35.2.8 2000/05/22 10:26:09 darrenr Exp $ 1370 */ 1371/* 1372 * Copy data from an mbuf chain starting "off" bytes from the beginning, 1373 * continuing for "len" bytes, into the indicated buffer. 1374 */ 1375void 1376m_copydata(m, off, len, cp) 1377 register mb_t *m; 1378 register int off; 1379 register int len; 1380 caddr_t cp; 1381{ 1382 register unsigned count; 1383 1384 if (off < 0 || len < 0) 1385 panic("m_copydata"); 1386 while (off > 0) { 1387 if (m == 0) 1388 panic("m_copydata"); 1389 if (off < m->m_len) 1390 break; 1391 off -= m->m_len; 1392 m = m->m_next; 1393 } 1394 while (len > 0) { 1395 if (m == 0) 1396 panic("m_copydata"); 1397 count = MIN(m->m_len - off, len); 1398 bcopy(mtod(m, caddr_t) + off, cp, count); 1399 len -= count; 1400 cp += count; 1401 off = 0; 1402 m = m->m_next; 1403 } 1404} 1405 1406 1407# ifndef linux 1408/* 1409 * Copy data from a buffer back into the indicated mbuf chain, 1410 * starting "off" bytes from the beginning, extending the mbuf 1411 * chain if necessary. 1412 */ 1413void 1414m_copyback(m0, off, len, cp) 1415 struct mbuf *m0; 1416 register int off; 1417 register int len; 1418 caddr_t cp; 1419{ 1420 register int mlen; 1421 register struct mbuf *m = m0, *n; 1422 int totlen = 0; 1423 1424 if (m0 == 0) 1425 return; 1426 while (off > (mlen = m->m_len)) { 1427 off -= mlen; 1428 totlen += mlen; 1429 if (m->m_next == 0) { 1430 n = m_getclr(M_DONTWAIT, m->m_type); 1431 if (n == 0) 1432 goto out; 1433 n->m_len = min(MLEN, len + off); 1434 m->m_next = n; 1435 } 1436 m = m->m_next; 1437 } 1438 while (len > 0) { 1439 mlen = min (m->m_len - off, len); 1440 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen); 1441 cp += mlen; 1442 len -= mlen; 1443 mlen += off; 1444 off = 0; 1445 totlen += mlen; 1446 if (len == 0) 1447 break; 1448 if (m->m_next == 0) { 1449 n = m_get(M_DONTWAIT, m->m_type); 1450 if (n == 0) 1451 break; 1452 n->m_len = min(MLEN, len); 1453 m->m_next = n; 1454 } 1455 m = m->m_next; 1456 } 1457out: 1458#if 0 1459 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen)) 1460 m->m_pkthdr.len = totlen; 1461#endif 1462 return; 1463} 1464# endif /* linux */ 1465#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */ 1466 1467 1468frgroup_t *fr_findgroup(num, flags, which, set, fgpp) 1469u_32_t num, flags; 1470minor_t which; 1471int set; 1472frgroup_t ***fgpp; 1473{ 1474 frgroup_t *fg, **fgp; 1475 1476 if (which == IPL_LOGAUTH) 1477 fgp = &ipfgroups[2][set]; 1478 else if (flags & FR_ACCOUNT) 1479 fgp = &ipfgroups[1][set]; 1480 else if (flags & (FR_OUTQUE|FR_INQUE)) 1481 fgp = &ipfgroups[0][set]; 1482 else 1483 return NULL; 1484 num &= 0xffff; 1485 1486 while ((fg = *fgp)) 1487 if (fg->fg_num == num) 1488 break; 1489 else 1490 fgp = &fg->fg_next; 1491 if (fgpp) 1492 *fgpp = fgp; 1493 return fg; 1494} 1495 1496 1497frgroup_t *fr_addgroup(num, fp, which, set) 1498u_32_t num; 1499frentry_t *fp; 1500minor_t which; 1501int set; 1502{ 1503 frgroup_t *fg, **fgp; 1504 1505 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp))) 1506 return fg; 1507 1508 KMALLOC(fg, frgroup_t *); 1509 if (fg) { 1510 fg->fg_num = num; 1511 fg->fg_next = *fgp; 1512 fg->fg_head = fp; 1513 fg->fg_start = &fp->fr_grp; 1514 *fgp = fg; 1515 } 1516 return fg; 1517} 1518 1519 1520void fr_delgroup(num, flags, which, set) 1521u_32_t num, flags; 1522minor_t which; 1523int set; 1524{ 1525 frgroup_t *fg, **fgp; 1526 1527 if (!(fg = fr_findgroup(num, flags, which, set, &fgp))) 1528 return; 1529 1530 *fgp = fg->fg_next; 1531 KFREE(fg); 1532} 1533 1534 1535 1536/* 1537 * recursively flush rules from the list, descending groups as they are 1538 * encountered. if a rule is the head of a group and it has lost all its 1539 * group members, then also delete the group reference. 1540 */ 1541static int frflushlist(set, unit, nfreedp, listp) 1542int set; 1543minor_t unit; 1544int *nfreedp; 1545frentry_t **listp; 1546{ 1547 register int freed = 0, i; 1548 register frentry_t *fp; 1549 1550 while ((fp = *listp)) { 1551 *listp = fp->fr_next; 1552 if (fp->fr_grp) { 1553 i = frflushlist(set, unit, nfreedp, &fp->fr_grp); 1554 MUTEX_ENTER(&ipf_rw); 1555 fp->fr_ref -= i; 1556 MUTEX_EXIT(&ipf_rw); 1557 } 1558 1559 ATOMIC_DEC32(fp->fr_ref); 1560 if (fp->fr_grhead) { 1561 fr_delgroup(fp->fr_grhead, fp->fr_flags, 1562 unit, set); 1563 fp->fr_grhead = 0; 1564 } 1565 if (fp->fr_ref == 0) { 1566 KFREE(fp); 1567 freed++; 1568 } else 1569 fp->fr_next = NULL; 1570 } 1571 *nfreedp += freed; 1572 return freed; 1573} 1574 1575 1576int frflush(unit, flags) 1577minor_t unit; 1578int flags; 1579{ 1580 int flushed = 0, set; 1581 1582 if (unit != IPL_LOGIPF) 1583 return 0; 1584 WRITE_ENTER(&ipf_mutex); 1585 bzero((char *)frcache, sizeof(frcache[0]) * 2); 1586 1587 set = fr_active; 1588 if (flags & FR_INACTIVE) 1589 set = 1 - set; 1590 1591 if (flags & FR_OUTQUE) { 1592#ifdef USE_INET6 1593 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]); 1594 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]); 1595#endif 1596 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]); 1597 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]); 1598 } 1599 if (flags & FR_INQUE) { 1600#ifdef USE_INET6 1601 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]); 1602 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]); 1603#endif 1604 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]); 1605 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]); 1606 } 1607 RWLOCK_EXIT(&ipf_mutex); 1608 return flushed; 1609} 1610 1611 1612char *memstr(src, dst, slen, dlen) 1613char *src, *dst; 1614int slen, dlen; 1615{ 1616 char *s = NULL; 1617 1618 while (dlen >= slen) { 1619 if (bcmp(src, dst, slen) == 0) { 1620 s = dst; 1621 break; 1622 } 1623 dst++; 1624 dlen--; 1625 } 1626 return s; 1627} 1628 1629 1630void fixskip(listp, rp, addremove) 1631frentry_t **listp, *rp; 1632int addremove; 1633{ 1634 frentry_t *fp; 1635 int rules = 0, rn = 0; 1636 1637 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++) 1638 ; 1639 1640 if (!fp) 1641 return; 1642 1643 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++) 1644 if (fp->fr_skip && (rn + fp->fr_skip >= rules)) 1645 fp->fr_skip += addremove; 1646} 1647 1648 1649#ifdef _KERNEL 1650/* 1651 * count consecutive 1's in bit mask. If the mask generated by counting 1652 * consecutive 1's is different to that passed, return -1, else return # 1653 * of bits. 1654 */ 1655int countbits(ip) 1656u_32_t ip; 1657{ 1658 u_32_t ipn; 1659 int cnt = 0, i, j; 1660 1661 ip = ipn = ntohl(ip); 1662 for (i = 32; i; i--, ipn *= 2) 1663 if (ipn & 0x80000000) 1664 cnt++; 1665 else 1666 break; 1667 ipn = 0; 1668 for (i = 32, j = cnt; i; i--, j--) { 1669 ipn *= 2; 1670 if (j > 0) 1671 ipn++; 1672 } 1673 if (ipn == ip) 1674 return cnt; 1675 return -1; 1676} 1677 1678 1679/* 1680 * return the first IP Address associated with an interface 1681 */ 1682int fr_ifpaddr(v, ifptr, inp) 1683int v; 1684void *ifptr; 1685struct in_addr *inp; 1686{ 1687# ifdef USE_INET6 1688 struct in6_addr *inp6 = NULL; 1689# endif 1690# if SOLARIS 1691 ill_t *ill = ifptr; 1692# else 1693 struct ifnet *ifp = ifptr; 1694# endif 1695 struct in_addr in; 1696 1697# if SOLARIS 1698# ifdef USE_INET6 1699 if (v == 6) { 1700 struct in6_addr in6; 1701 1702 /* 1703 * First is always link local. 1704 */ 1705 if (ill->ill_ipif->ipif_next) 1706 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr; 1707 else 1708 bzero((char *)&in6, sizeof(in6)); 1709 bcopy((char *)&in6, (char *)inp, sizeof(in6)); 1710 } else 1711# endif 1712 { 1713 in.s_addr = ill->ill_ipif->ipif_local_addr; 1714 *inp = in; 1715 } 1716# else /* SOLARIS */ 1717# if linux 1718 ; 1719# else /* linux */ 1720 struct sockaddr_in *sin; 1721 struct ifaddr *ifa; 1722 1723# if (__FreeBSD_version >= 300000) 1724 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1725# else 1726# if defined(__NetBSD__) || defined(__OpenBSD__) 1727 ifa = ifp->if_addrlist.tqh_first; 1728# else 1729# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */ 1730 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa; 1731# else 1732 ifa = ifp->if_addrlist; 1733# endif 1734# endif /* __NetBSD__ || __OpenBSD__ */ 1735# endif /* __FreeBSD_version >= 300000 */ 1736# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK)) 1737 sin = (struct sockaddr_in *)&ifa->ifa_addr; 1738# else 1739 sin = (struct sockaddr_in *)ifa->ifa_addr; 1740 while (sin && ifa) { 1741 if ((v == 4) && (sin->sin_family == AF_INET)) 1742 break; 1743# ifdef USE_INET6 1744 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1745 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1746 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1747 !IN6_IS_ADDR_LOOPBACK(inp6)) 1748 break; 1749 } 1750# endif 1751# if (__FreeBSD_version >= 300000) 1752 ifa = TAILQ_NEXT(ifa, ifa_link); 1753# else 1754# if defined(__NetBSD__) || defined(__OpenBSD__) 1755 ifa = ifa->ifa_list.tqe_next; 1756# else 1757 ifa = ifa->ifa_next; 1758# endif 1759# endif /* __FreeBSD_version >= 300000 */ 1760 if (ifa) 1761 sin = (struct sockaddr_in *)ifa->ifa_addr; 1762 } 1763 if (ifa == NULL) 1764 sin = NULL; 1765 if (sin == NULL) 1766 return -1; 1767# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */ 1768# ifdef USE_INET6 1769 if (v == 6) 1770 bcopy((char *)inp6, (char *)inp, sizeof(*inp6)); 1771 else 1772# endif 1773 { 1774 in = sin->sin_addr; 1775 *inp = in; 1776 } 1777# endif /* linux */ 1778# endif /* SOLARIS */ 1779 return 0; 1780} 1781 1782 1783static void frsynclist(fr) 1784register frentry_t *fr; 1785{ 1786 for (; fr; fr = fr->fr_next) { 1787 if (fr->fr_ifa != NULL) { 1788 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v); 1789 if (fr->fr_ifa == NULL) 1790 fr->fr_ifa = (void *)-1; 1791 } 1792 if (fr->fr_grp) 1793 frsynclist(fr->fr_grp); 1794 } 1795} 1796 1797 1798void frsync() 1799{ 1800# if !SOLARIS 1801 register struct ifnet *ifp; 1802 1803# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \ 1804 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)) 1805# if (NetBSD >= 199905) || defined(__OpenBSD__) 1806 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 1807# else 1808 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) 1809# endif 1810# else 1811 for (ifp = ifnet; ifp; ifp = ifp->if_next) 1812# endif 1813 { 1814 ip_natsync(ifp); 1815 ip_statesync(ifp); 1816 } 1817# endif 1818 1819 WRITE_ENTER(&ipf_mutex); 1820 frsynclist(ipacct[0][fr_active]); 1821 frsynclist(ipacct[1][fr_active]); 1822 frsynclist(ipfilter[0][fr_active]); 1823 frsynclist(ipfilter[1][fr_active]); 1824#ifdef USE_INET6 1825 frsynclist(ipacct6[0][fr_active]); 1826 frsynclist(ipacct6[1][fr_active]); 1827 frsynclist(ipfilter6[0][fr_active]); 1828 frsynclist(ipfilter6[1][fr_active]); 1829#endif 1830 RWLOCK_EXIT(&ipf_mutex); 1831} 1832 1833 1834/* 1835 * In the functions below, bcopy() is called because the pointer being 1836 * copied _from_ in this instance is a pointer to a char buf (which could 1837 * end up being unaligned) and on the kernel's local stack. 1838 */ 1839int ircopyptr(a, b, c) 1840void *a, *b; 1841size_t c; 1842{ 1843 caddr_t ca; 1844 int err; 1845 1846#if SOLARIS 1847 copyin(a, &ca, sizeof(ca)); 1848#else 1849 bcopy(a, &ca, sizeof(ca)); 1850#endif 1851 err = copyin(ca, b, c); 1852 return err; 1853} 1854 1855 1856int iwcopyptr(a, b, c) 1857void *a, *b; 1858size_t c; 1859{ 1860 caddr_t ca; 1861 int err; 1862 1863#if SOLARIS 1864 copyin(b, &ca, sizeof(ca)); 1865#else 1866 bcopy(b, &ca, sizeof(ca)); 1867#endif 1868 err = copyout(a, ca, c); 1869 return err; 1870} 1871 1872#else /* _KERNEL */ 1873 1874 1875/* 1876 * return the first IP Address associated with an interface 1877 */ 1878int fr_ifpaddr(v, ifptr, inp) 1879int v; 1880void *ifptr; 1881struct in_addr *inp; 1882{ 1883 return 0; 1884} 1885 1886 1887int ircopyptr(a, b, c) 1888void *a, *b; 1889size_t c; 1890{ 1891 caddr_t ca; 1892 1893 bcopy(a, &ca, sizeof(ca)); 1894 bcopy(ca, b, c); 1895 return 0; 1896} 1897 1898 1899int iwcopyptr(a, b, c) 1900void *a, *b; 1901size_t c; 1902{ 1903 caddr_t ca; 1904 1905 bcopy(b, &ca, sizeof(ca)); 1906 bcopy(a, ca, c); 1907 return 0; 1908} 1909 1910 1911#endif 1912 1913 1914int fr_lock(data, lockp) 1915caddr_t data; 1916int *lockp; 1917{ 1918 int arg, error; 1919 1920 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg)); 1921 if (!error) { 1922 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp)); 1923 if (!error) 1924 *lockp = arg; 1925 } 1926 return error; 1927} 1928 1929 1930void fr_getstat(fiop) 1931friostat_t *fiop; 1932{ 1933 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2); 1934 fiop->f_locks[0] = fr_state_lock; 1935 fiop->f_locks[1] = fr_nat_lock; 1936 fiop->f_locks[2] = fr_frag_lock; 1937 fiop->f_locks[3] = fr_auth_lock; 1938 fiop->f_fin[0] = ipfilter[0][0]; 1939 fiop->f_fin[1] = ipfilter[0][1]; 1940 fiop->f_fout[0] = ipfilter[1][0]; 1941 fiop->f_fout[1] = ipfilter[1][1]; 1942 fiop->f_acctin[0] = ipacct[0][0]; 1943 fiop->f_acctin[1] = ipacct[0][1]; 1944 fiop->f_acctout[0] = ipacct[1][0]; 1945 fiop->f_acctout[1] = ipacct[1][1]; 1946#ifdef USE_INET6 1947 fiop->f_fin6[0] = ipfilter6[0][0]; 1948 fiop->f_fin6[1] = ipfilter6[0][1]; 1949 fiop->f_fout6[0] = ipfilter6[1][0]; 1950 fiop->f_fout6[1] = ipfilter6[1][1]; 1951 fiop->f_acctin6[0] = ipacct6[0][0]; 1952 fiop->f_acctin6[1] = ipacct6[0][1]; 1953 fiop->f_acctout6[0] = ipacct6[1][0]; 1954 fiop->f_acctout6[1] = ipacct6[1][1]; 1955#endif 1956 fiop->f_active = fr_active; 1957 fiop->f_froute[0] = ipl_frouteok[0]; 1958 fiop->f_froute[1] = ipl_frouteok[1]; 1959 1960 fiop->f_running = fr_running; 1961 fiop->f_groups[0][0] = ipfgroups[0][0]; 1962 fiop->f_groups[0][1] = ipfgroups[0][1]; 1963 fiop->f_groups[1][0] = ipfgroups[1][0]; 1964 fiop->f_groups[1][1] = ipfgroups[1][1]; 1965 fiop->f_groups[2][0] = ipfgroups[2][0]; 1966 fiop->f_groups[2][1] = ipfgroups[2][1]; 1967#ifdef IPFILTER_LOG 1968 fiop->f_logging = 1; 1969#else 1970 fiop->f_logging = 0; 1971#endif 1972 fiop->f_defpass = fr_pass; 1973 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version)); 1974} 1975 1976 1977#ifdef USE_INET6 1978int icmptoicmp6types[ICMP_MAXTYPE+1] = { 1979 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */ 1980 -1, /* 1: UNUSED */ 1981 -1, /* 2: UNUSED */ 1982 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */ 1983 -1, /* 4: ICMP_SOURCEQUENCH */ 1984 ND_REDIRECT, /* 5: ICMP_REDIRECT */ 1985 -1, /* 6: UNUSED */ 1986 -1, /* 7: UNUSED */ 1987 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */ 1988 -1, /* 9: UNUSED */ 1989 -1, /* 10: UNUSED */ 1990 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */ 1991 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */ 1992 -1, /* 13: ICMP_TSTAMP */ 1993 -1, /* 14: ICMP_TSTAMPREPLY */ 1994 -1, /* 15: ICMP_IREQ */ 1995 -1, /* 16: ICMP_IREQREPLY */ 1996 -1, /* 17: ICMP_MASKREQ */ 1997 -1, /* 18: ICMP_MASKREPLY */ 1998}; 1999 2000 2001int icmptoicmp6unreach[ICMP_MAX_UNREACH] = { 2002 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */ 2003 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */ 2004 -1, /* 2: ICMP_UNREACH_PROTOCOL */ 2005 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */ 2006 -1, /* 4: ICMP_UNREACH_NEEDFRAG */ 2007 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */ 2008 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */ 2009 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */ 2010 -1, /* 8: ICMP_UNREACH_ISOLATED */ 2011 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */ 2012 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */ 2013 -1, /* 11: ICMP_UNREACH_TOSNET */ 2014 -1, /* 12: ICMP_UNREACH_TOSHOST */ 2015 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */ 2016}; 2017#endif 2018