fil.c revision 63523
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 63523 2000-07-19 14:02:09Z darrenr $"; 12#endif 13 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(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \ 20 defined(_KERNEL) 21# include "opt_ipfilter_log.h" 22#endif 23#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \ 24 (__FreeBSD_version >= 220000) 25# if (__FreeBSD_version >= 400000) 26# ifndef KLD_MODULE 27# include "opt_inet6.h" 28# endif 29# if (__FreeBSD_version == 400019) 30# define CSUM_DELAY_DATA 31# endif 32# endif 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# else /* SOLARIS */ 126# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, ip) 127# endif /* SOLARIS || __sgi */ 128#endif /* _KERNEL */ 129 130 131struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}}; 132struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } }, 133#ifdef USE_INET6 134 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } }, 135 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } }, 136#endif 137 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } }; 138struct frgroup *ipfgroups[3][2]; 139int fr_flags = IPF_LOGGING; 140int fr_active = 0; 141int fr_chksrc = 0; 142#if defined(IPFILTER_DEFAULT_BLOCK) 143int fr_pass = FR_NOMATCH|FR_BLOCK; 144#else 145int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH); 146#endif 147char ipfilter_version[] = IPL_VERSION; 148 149fr_info_t frcache[2]; 150 151static int frflushlist __P((int, minor_t, int *, frentry_t **)); 152#ifdef _KERNEL 153static void frsynclist __P((frentry_t *)); 154#endif 155 156 157/* 158 * bit values for identifying presence of individual IP options 159 */ 160struct optlist ipopts[20] = { 161 { IPOPT_NOP, 0x000001 }, 162 { IPOPT_RR, 0x000002 }, 163 { IPOPT_ZSU, 0x000004 }, 164 { IPOPT_MTUP, 0x000008 }, 165 { IPOPT_MTUR, 0x000010 }, 166 { IPOPT_ENCODE, 0x000020 }, 167 { IPOPT_TS, 0x000040 }, 168 { IPOPT_TR, 0x000080 }, 169 { IPOPT_SECURITY, 0x000100 }, 170 { IPOPT_LSRR, 0x000200 }, 171 { IPOPT_E_SEC, 0x000400 }, 172 { IPOPT_CIPSO, 0x000800 }, 173 { IPOPT_SATID, 0x001000 }, 174 { IPOPT_SSRR, 0x002000 }, 175 { IPOPT_ADDEXT, 0x004000 }, 176 { IPOPT_VISA, 0x008000 }, 177 { IPOPT_IMITD, 0x010000 }, 178 { IPOPT_EIP, 0x020000 }, 179 { IPOPT_FINN, 0x040000 }, 180 { 0, 0x000000 } 181}; 182 183/* 184 * bit values for identifying presence of individual IP security options 185 */ 186struct optlist secopt[8] = { 187 { IPSO_CLASS_RES4, 0x01 }, 188 { IPSO_CLASS_TOPS, 0x02 }, 189 { IPSO_CLASS_SECR, 0x04 }, 190 { IPSO_CLASS_RES3, 0x08 }, 191 { IPSO_CLASS_CONF, 0x10 }, 192 { IPSO_CLASS_UNCL, 0x20 }, 193 { IPSO_CLASS_RES2, 0x40 }, 194 { IPSO_CLASS_RES1, 0x80 } 195}; 196 197 198/* 199 * compact the IP header into a structure which contains just the info. 200 * which is useful for comparing IP headers with. 201 */ 202void fr_makefrip(hlen, ip, fin) 203int hlen; 204ip_t *ip; 205fr_info_t *fin; 206{ 207 u_short optmsk = 0, secmsk = 0, auth = 0; 208 int i, mv, ol, off, p, plen, v; 209 fr_ip_t *fi = &fin->fin_fi; 210 struct optlist *op; 211 u_char *s, opt; 212 tcphdr_t *tcp; 213 214 fin->fin_rev = 0; 215 fin->fin_fr = NULL; 216 fin->fin_tcpf = 0; 217 fin->fin_data[0] = 0; 218 fin->fin_data[1] = 0; 219 fin->fin_rule = -1; 220 fin->fin_group = -1; 221#ifdef _KERNEL 222 fin->fin_icode = ipl_unreach; 223#endif 224 v = fin->fin_v; 225 fi->fi_v = v; 226 fin->fin_hlen = hlen; 227 if (v == 4) { 228 fin->fin_id = ip->ip_id; 229 fi->fi_tos = ip->ip_tos; 230 off = (ip->ip_off & IP_OFFMASK) << 3; 231 tcp = (tcphdr_t *)((char *)ip + hlen); 232 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4)); 233 fi->fi_src.i6[1] = 0; 234 fi->fi_src.i6[2] = 0; 235 fi->fi_src.i6[3] = 0; 236 fi->fi_dst.i6[1] = 0; 237 fi->fi_dst.i6[2] = 0; 238 fi->fi_dst.i6[3] = 0; 239 fi->fi_saddr = ip->ip_src.s_addr; 240 fi->fi_daddr = ip->ip_dst.s_addr; 241 p = ip->ip_p; 242 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0; 243 if (ip->ip_off & 0x3fff) 244 fi->fi_fl |= FI_FRAG; 245 plen = ip->ip_len; 246 fin->fin_dlen = plen - hlen; 247 } 248#ifdef USE_INET6 249 else if (v == 6) { 250 ip6_t *ip6 = (ip6_t *)ip; 251 252 off = 0; 253 p = ip6->ip6_nxt; 254 fi->fi_p = p; 255 fi->fi_ttl = ip6->ip6_hlim; 256 tcp = (tcphdr_t *)(ip6 + 1); 257 fi->fi_src.in6 = ip6->ip6_src; 258 fi->fi_dst.in6 = ip6->ip6_dst; 259 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff); 260 fi->fi_tos = 0; 261 fi->fi_fl = 0; 262 plen = ntohs(ip6->ip6_plen); 263 fin->fin_dlen = plen; 264 } 265#endif 266 else 267 return; 268 269 fin->fin_off = off; 270 fin->fin_plen = plen; 271 fin->fin_dp = (void *)tcp; 272 273 switch (p) 274 { 275 case IPPROTO_ICMP : 276 { 277 int minicmpsz = sizeof(struct icmp); 278 icmphdr_t *icmp; 279 280 icmp = (icmphdr_t *)tcp; 281 282 if (!off && (icmp->icmp_type == ICMP_ECHOREPLY || 283 icmp->icmp_type == ICMP_ECHO)) 284 minicmpsz = ICMP_MINLEN; 285 286 /* type(1) + code(1) + cksum(2) + id(2) seq(2) + 287 * 3*timestamp(3*4) */ 288 else if (!off && (icmp->icmp_type == ICMP_TSTAMP || 289 icmp->icmp_type == ICMP_TSTAMPREPLY)) 290 minicmpsz = 20; 291 292 /* type(1) + code(1) + cksum(2) + id(2) seq(2) + mask(4) */ 293 else if (!off && (icmp->icmp_type == ICMP_MASKREQ || 294 icmp->icmp_type == ICMP_MASKREPLY)) 295 minicmpsz = 12; 296 297 if ((!(plen >= hlen + minicmpsz) && !off) || 298 (off && off < sizeof(struct icmp))) 299 fi->fi_fl |= FI_SHORT; 300 if (fin->fin_dlen > 1) 301 fin->fin_data[0] = *(u_short *)tcp; 302 break; 303 } 304 case IPPROTO_TCP : 305 fi->fi_fl |= FI_TCPUDP; 306#ifdef USE_INET6 307 if (v == 6) { 308 if (plen < sizeof(struct tcphdr)) 309 fi->fi_fl |= FI_SHORT; 310 } else 311#endif 312 if (v == 4) { 313 if ((!IPMINLEN(ip, tcphdr) && !off) || 314 (off && off < sizeof(struct tcphdr))) 315 fi->fi_fl |= FI_SHORT; 316 } 317 if (!(fi->fi_fl & FI_SHORT) && !off) 318 fin->fin_tcpf = tcp->th_flags; 319 goto getports; 320 case IPPROTO_UDP : 321 fi->fi_fl |= FI_TCPUDP; 322#ifdef USE_INET6 323 if (v == 6) { 324 if (plen < sizeof(struct udphdr)) 325 fi->fi_fl |= FI_SHORT; 326 } else 327#endif 328 if (v == 4) { 329 if ((!IPMINLEN(ip, udphdr) && !off) || 330 (off && off < sizeof(struct udphdr))) 331 fi->fi_fl |= FI_SHORT; 332 } 333getports: 334 if (!off && (fin->fin_dlen > 3)) { 335 fin->fin_data[0] = ntohs(tcp->th_sport); 336 fin->fin_data[1] = ntohs(tcp->th_dport); 337 } 338 break; 339 default : 340 break; 341 } 342 343#ifdef USE_INET6 344 if (v == 6) { 345 fi->fi_optmsk = 0; 346 fi->fi_secmsk = 0; 347 fi->fi_auth = 0; 348 return; 349 } 350#endif 351 352 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) { 353 opt = *s; 354 if (opt == '\0') 355 break; 356 else if (opt == IPOPT_NOP) 357 ol = 1; 358 else { 359 if (hlen < 2) 360 break; 361 ol = (int)*(s + 1); 362 if (ol < 2 || ol > hlen) 363 break; 364 } 365 for (i = 9, mv = 4; mv >= 0; ) { 366 op = ipopts + i; 367 if (opt == (u_char)op->ol_val) { 368 optmsk |= op->ol_bit; 369 if (opt == IPOPT_SECURITY) { 370 struct optlist *sp; 371 u_char sec; 372 int j, m; 373 374 sec = *(s + 2); /* classification */ 375 for (j = 3, m = 2; m >= 0; ) { 376 sp = secopt + j; 377 if (sec == sp->ol_val) { 378 secmsk |= sp->ol_bit; 379 auth = *(s + 3); 380 auth *= 256; 381 auth += *(s + 4); 382 break; 383 } 384 if (sec < sp->ol_val) 385 j -= m--; 386 else 387 j += m--; 388 } 389 } 390 break; 391 } 392 if (opt < op->ol_val) 393 i -= mv--; 394 else 395 i += mv--; 396 } 397 hlen -= ol; 398 s += ol; 399 } 400 if (auth && !(auth & 0x0100)) 401 auth &= 0xff00; 402 fi->fi_optmsk = optmsk; 403 fi->fi_secmsk = secmsk; 404 fi->fi_auth = auth; 405} 406 407 408/* 409 * check an IP packet for TCP/UDP characteristics such as ports and flags. 410 */ 411int fr_tcpudpchk(ft, fin) 412frtuc_t *ft; 413fr_info_t *fin; 414{ 415 register u_short po, tup; 416 register char i; 417 register int err = 1; 418 419 /* 420 * Both ports should *always* be in the first fragment. 421 * So far, I cannot find any cases where they can not be. 422 * 423 * compare destination ports 424 */ 425 if ((i = (int)ft->ftu_dcmp)) { 426 po = ft->ftu_dport; 427 tup = fin->fin_data[1]; 428 /* 429 * Do opposite test to that required and 430 * continue if that succeeds. 431 */ 432 if (!--i && tup != po) /* EQUAL */ 433 err = 0; 434 else if (!--i && tup == po) /* NOTEQUAL */ 435 err = 0; 436 else if (!--i && tup >= po) /* LESSTHAN */ 437 err = 0; 438 else if (!--i && tup <= po) /* GREATERTHAN */ 439 err = 0; 440 else if (!--i && tup > po) /* LT or EQ */ 441 err = 0; 442 else if (!--i && tup < po) /* GT or EQ */ 443 err = 0; 444 else if (!--i && /* Out of range */ 445 (tup >= po && tup <= ft->ftu_dtop)) 446 err = 0; 447 else if (!--i && /* In range */ 448 (tup <= po || tup >= ft->ftu_dtop)) 449 err = 0; 450 } 451 /* 452 * compare source ports 453 */ 454 if (err && (i = (int)ft->ftu_scmp)) { 455 po = ft->ftu_sport; 456 tup = fin->fin_data[0]; 457 if (!--i && tup != po) 458 err = 0; 459 else 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 && /* Out of range */ 470 (tup >= po && tup <= ft->ftu_stop)) 471 err = 0; 472 else if (!--i && /* In range */ 473 (tup <= po || tup >= ft->ftu_stop)) 474 err = 0; 475 } 476 477 /* 478 * If we don't have all the TCP/UDP header, then how can we 479 * expect to do any sort of match on it ? If we were looking for 480 * TCP flags, then NO match. If not, then match (which should 481 * satisfy the "short" class too). 482 */ 483 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) { 484 if (fin->fin_fi.fi_fl & FI_SHORT) 485 return !(ft->ftu_tcpf | ft->ftu_tcpfm); 486 /* 487 * Match the flags ? If not, abort this match. 488 */ 489 if (ft->ftu_tcpfm && 490 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) { 491 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf, 492 ft->ftu_tcpfm, ft->ftu_tcpf)); 493 err = 0; 494 } 495 } 496 return err; 497} 498 499/* 500 * Check the input/output list of rules for a match and result. 501 * Could be per interface, but this gets real nasty when you don't have 502 * kernel sauce. 503 */ 504int fr_scanlist(pass, ip, fin, m) 505u_32_t pass; 506ip_t *ip; 507register fr_info_t *fin; 508void *m; 509{ 510 register struct frentry *fr; 511 register fr_ip_t *fi = &fin->fin_fi; 512 int rulen, portcmp = 0, off, skip = 0, logged = 0; 513 u_32_t passt; 514 515 fr = fin->fin_fr; 516 fin->fin_fr = NULL; 517 fin->fin_rule = 0; 518 fin->fin_group = 0; 519 if (fin->fin_v == 4) 520 off = ip->ip_off & IP_OFFMASK; 521 else 522 off = 0; 523 pass |= (fi->fi_fl << 24); 524 525 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off) 526 portcmp = 1; 527 528 for (rulen = 0; fr; fr = fr->fr_next, rulen++) { 529 if (skip) { 530 skip--; 531 continue; 532 } 533 /* 534 * In all checks below, a null (zero) value in the 535 * filter struture is taken to mean a wildcard. 536 * 537 * check that we are working for the right interface 538 */ 539#ifdef _KERNEL 540# if BSD >= 199306 541 if (fin->fin_out != 0) { 542 if ((fr->fr_oifa && 543 fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif) || 544 (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)) 545 continue; 546 } else 547# endif 548 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) 549 continue; 550#else 551 if (opts & (OPT_VERBOSE|OPT_DEBUG)) 552 printf("\n"); 553 FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' : 554 (pass & FR_AUTH) ? 'a' : 'b')); 555 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) 556 continue; 557 FR_VERBOSE((":i")); 558#endif 559 { 560 register u_32_t *ld, *lm, *lip; 561 register int i; 562 563 lip = (u_32_t *)fi; 564 lm = (u_32_t *)&fr->fr_mip; 565 ld = (u_32_t *)&fr->fr_ip; 566 i = ((*lip & *lm) != *ld); 567 FR_DEBUG(("0. %#08x & %#08x != %#08x\n", 568 *lip, *lm, *ld)); 569 if (i) 570 continue; 571 /* 572 * We now know whether the packet version and the 573 * rule version match, along with protocol, ttl and 574 * tos. 575 */ 576 lip++, lm++, ld++; 577 /* 578 * Unrolled loops (4 each, for 32 bits). 579 */ 580 i |= ((*lip & *lm) != *ld) << 19; 581 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n", 582 *lip, *lm, *ld)); 583 if (fi->fi_v == 6) { 584 lip++, lm++, ld++; 585 i |= ((*lip & *lm) != *ld) << 19; 586 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n", 587 *lip, *lm, *ld)); 588 lip++, lm++, ld++; 589 i |= ((*lip & *lm) != *ld) << 19; 590 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n", 591 *lip, *lm, *ld)); 592 lip++, lm++, ld++; 593 i |= ((*lip & *lm) != *ld) << 19; 594 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n", 595 *lip, *lm, *ld)); 596 } else { 597 lip += 3; 598 lm += 3; 599 ld += 3; 600 } 601 i ^= (fr->fr_flags & FR_NOTSRCIP); 602 if (i) 603 continue; 604 lip++, lm++, ld++; 605 i |= ((*lip & *lm) != *ld) << 20; 606 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n", 607 *lip, *lm, *ld)); 608 if (fi->fi_v == 6) { 609 lip++, lm++, ld++; 610 i |= ((*lip & *lm) != *ld) << 20; 611 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n", 612 *lip, *lm, *ld)); 613 lip++, lm++, ld++; 614 i |= ((*lip & *lm) != *ld) << 20; 615 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n", 616 *lip, *lm, *ld)); 617 lip++, lm++, ld++; 618 i |= ((*lip & *lm) != *ld) << 20; 619 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n", 620 *lip, *lm, *ld)); 621 } else { 622 lip += 3; 623 lm += 3; 624 ld += 3; 625 } 626 i ^= (fr->fr_flags & FR_NOTDSTIP); 627 if (i) 628 continue; 629 lip++, lm++, ld++; 630 i |= ((*lip & *lm) != *ld); 631 FR_DEBUG(("3. %#08x & %#08x != %#08x\n", 632 *lip, *lm, *ld)); 633 lip++, lm++, ld++; 634 i |= ((*lip & *lm) != *ld); 635 FR_DEBUG(("4. %#08x & %#08x != %#08x\n", 636 *lip, *lm, *ld)); 637 if (i) 638 continue; 639 } 640 641 /* 642 * If a fragment, then only the first has what we're looking 643 * for here... 644 */ 645 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf || 646 fr->fr_tcpfm)) 647 continue; 648 if (fi->fi_fl & FI_TCPUDP) { 649 if (!fr_tcpudpchk(&fr->fr_tuc, fin)) 650 continue; 651 } else if (fr->fr_icmpm || fr->fr_icmp) { 652 if ((fi->fi_p != IPPROTO_ICMP) || off || 653 (fin->fin_dlen < 2)) 654 continue; 655 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) { 656 FR_DEBUG(("i. %#x & %#x != %#x\n", 657 fin->fin_data[0], fr->fr_icmpm, 658 fr->fr_icmp)); 659 continue; 660 } 661 } 662 FR_VERBOSE(("*")); 663 /* 664 * Just log this packet... 665 */ 666 passt = fr->fr_flags; 667#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL)) 668 if (securelevel <= 0) 669#endif 670 if ((passt & FR_CALLNOW) && fr->fr_func) 671 passt = (*fr->fr_func)(passt, ip, fin); 672 fin->fin_fr = fr; 673#ifdef IPFILTER_LOG 674 if ((passt & FR_LOGMASK) == FR_LOG) { 675 if (!IPLLOG(passt, ip, fin, m)) { 676 if (passt & FR_LOGORBLOCK) 677 passt |= FR_BLOCK|FR_QUICK; 678 ATOMIC_INCL(frstats[fin->fin_out].fr_skip); 679 } 680 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl); 681 logged = 1; 682 } 683#endif /* IPFILTER_LOG */ 684 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG) 685 pass = passt; 686 FR_DEBUG(("pass %#x\n", pass)); 687 ATOMIC_INCL(fr->fr_hits); 688 if (pass & FR_ACCOUNT) 689 fr->fr_bytes += (U_QUAD_T)ip->ip_len; 690 else 691 fin->fin_icode = fr->fr_icode; 692 fin->fin_rule = rulen; 693 fin->fin_group = fr->fr_group; 694 if (fr->fr_grp) { 695 fin->fin_fr = fr->fr_grp; 696 pass = fr_scanlist(pass, ip, fin, m); 697 if (fin->fin_fr == NULL) { 698 fin->fin_rule = rulen; 699 fin->fin_group = fr->fr_group; 700 fin->fin_fr = fr; 701 } 702 if (pass & FR_DONTCACHE) 703 logged = 1; 704 } 705 if (pass & FR_QUICK) 706 break; 707 } 708 if (logged) 709 pass |= FR_DONTCACHE; 710 return pass; 711} 712 713 714/* 715 * frcheck - filter check 716 * check using source and destination addresses/ports in a packet whether 717 * or not to pass it on or not. 718 */ 719int fr_check(ip, hlen, ifp, out 720#if defined(_KERNEL) && SOLARIS 721, qif, mp) 722qif_t *qif; 723#else 724, mp) 725#endif 726mb_t **mp; 727ip_t *ip; 728int hlen; 729void *ifp; 730int out; 731{ 732 /* 733 * The above really sucks, but short of writing a diff 734 */ 735 fr_info_t frinfo, *fc; 736 register fr_info_t *fin = &frinfo; 737 int changed, error = EHOSTUNREACH, v = ip->ip_v; 738 frentry_t *fr = NULL, *list; 739 u_32_t pass, apass; 740#if !SOLARIS || !defined(_KERNEL) 741 register mb_t *m = *mp; 742#endif 743 744#ifdef _KERNEL 745 mb_t *mc = NULL; 746# if !defined(__SVR4) && !defined(__svr4__) 747# ifdef __sgi 748 char hbuf[(0xf << 2) + sizeof(struct icmp) + sizeof(ip_t) + 8]; 749# endif 750 int up; 751 752# ifdef M_CANFASTFWD 753 /* 754 * XXX For now, IP Filter and fast-forwarding of cached flows 755 * XXX are mutually exclusive. Eventually, IP Filter should 756 * XXX get a "can-fast-forward" filter rule. 757 */ 758 m->m_flags &= ~M_CANFASTFWD; 759# endif /* M_CANFASTFWD */ 760# ifdef CSUM_DELAY_DATA 761 /* 762 * disable delayed checksums. 763 */ 764 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 765 in_delayed_cksum(m); 766 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; 767 } 768# endif /* CSUM_DELAY_DATA */ 769 770 771 if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP || 772 ip->ip_p == IPPROTO_ICMP)) { 773 int plen = 0; 774 775 if ((ip->ip_off & IP_OFFMASK) == 0) 776 switch(ip->ip_p) 777 { 778 case IPPROTO_TCP: 779 plen = sizeof(tcphdr_t); 780 break; 781 case IPPROTO_UDP: 782 plen = sizeof(udphdr_t); 783 break; 784 /* 96 - enough for complete ICMP error IP header */ 785 case IPPROTO_ICMP: 786 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t); 787 break; 788 } 789 up = MIN(hlen + plen, ip->ip_len); 790 791 if (up > m->m_len) { 792# ifdef __sgi 793 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */ 794 if ((up > sizeof(hbuf)) || (m_length(m) < up)) { 795 ATOMIC_INCL(frstats[out].fr_pull[1]); 796 return -1; 797 } 798 m_copydata(m, 0, up, hbuf); 799 ATOMIC_INCL(frstats[out].fr_pull[0]); 800 ip = (ip_t *)hbuf; 801# else /* __ sgi */ 802# ifndef linux 803 if ((*mp = m_pullup(m, up)) == 0) { 804 ATOMIC_INCL(frstats[out].fr_pull[1]); 805 return -1; 806 } else { 807 ATOMIC_INCL(frstats[out].fr_pull[0]); 808 m = *mp; 809 ip = mtod(m, ip_t *); 810 } 811# endif /* !linux */ 812# endif /* __sgi */ 813 } else 814 up = 0; 815 } else 816 up = 0; 817# endif /* !defined(__SVR4) && !defined(__svr4__) */ 818# if SOLARIS 819 mb_t *m = qif->qf_m; 820 821 if ((u_int)ip & 0x3) 822 return 2; 823 fin->fin_qfm = m; 824 fin->fin_qif = qif; 825# endif 826# ifdef USE_INET6 827 if (v == 6) { 828 ATOMIC_INCL(frstats[0].fr_ipv6[out]); 829 } else 830# endif 831 if (!out && fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) { 832 ATOMIC_INCL(frstats[0].fr_badsrc); 833# if !SOLARIS 834 m_freem(m); 835# endif 836 return error; 837 } 838#endif /* _KERNEL */ 839 840 /* 841 * Be careful here: ip_id is in network byte order when called 842 * from ip_output() 843 */ 844 if ((out) && (v == 4)) 845 ip->ip_id = ntohs(ip->ip_id); 846 847 changed = 0; 848 fin->fin_v = v; 849 fin->fin_ifp = ifp; 850 fin->fin_out = out; 851 fin->fin_mp = mp; 852 fr_makefrip(hlen, ip, fin); 853 pass = fr_pass; 854 855 if (fin->fin_fi.fi_fl & FI_SHORT) { 856 ATOMIC_INCL(frstats[out].fr_short); 857 } 858 859 READ_ENTER(&ipf_mutex); 860 861 if (fin->fin_fi.fi_fl & FI_SHORT) 862 ATOMIC_INCL(frstats[out].fr_short); 863 864 /* 865 * Check auth now. This, combined with the check below to see if apass 866 * is 0 is to ensure that we don't count the packet twice, which can 867 * otherwise occur when we reprocess it. As it is, we only count it 868 * after it has no auth. table matchup. This also stops NAT from 869 * occuring until after the packet has been auth'd. 870 */ 871 apass = fr_checkauth(ip, fin); 872 873 if (!out) { 874#ifdef USE_INET6 875 if (v == 6) 876 list = ipacct6[0][fr_active]; 877 else 878#endif 879 list = ipacct[0][fr_active]; 880 changed = ip_natin(ip, fin); 881 if (!apass && (fin->fin_fr = list) && 882 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) { 883 ATOMIC_INCL(frstats[0].fr_acct); 884 } 885 } 886 887 if (apass || (!(fr = ipfr_knownfrag(ip, fin)) && 888 !(fr = fr_checkstate(ip, fin)))) { 889 /* 890 * If a packet is found in the auth table, then skip checking 891 * the access lists for permission but we do need to consider 892 * the result as if it were from the ACL's. 893 */ 894 if (!apass) { 895 fc = frcache + out; 896 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) { 897 /* 898 * copy cached data so we can unlock the mutex 899 * earlier. 900 */ 901 bcopy((char *)fc, (char *)fin, FI_COPYSIZE); 902 ATOMIC_INCL(frstats[out].fr_chit); 903 if ((fr = fin->fin_fr)) { 904 ATOMIC_INCL(fr->fr_hits); 905 pass = fr->fr_flags; 906 } 907 } else { 908#ifdef USE_INET6 909 if (v == 6) 910 list = ipfilter6[out][fr_active]; 911 else 912#endif 913 list = ipfilter[out][fr_active]; 914 if ((fin->fin_fr = list)) 915 pass = fr_scanlist(fr_pass, ip, fin, m); 916 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE))) 917 bcopy((char *)fin, (char *)fc, 918 FI_COPYSIZE); 919 if (pass & FR_NOMATCH) { 920 ATOMIC_INCL(frstats[out].fr_nom); 921 } 922 } 923 fr = fin->fin_fr; 924 } else 925 pass = apass; 926 927 /* 928 * If we fail to add a packet to the authorization queue, 929 * then we drop the packet later. However, if it was added 930 * then pretend we've dropped it already. 931 */ 932 if ((pass & FR_AUTH)) 933 if (fr_newauth((mb_t *)m, fin, ip) != 0) 934#ifdef _KERNEL 935 m = *mp = NULL; 936#else 937 ; 938#endif 939 940 if (pass & FR_PREAUTH) { 941 READ_ENTER(&ipf_auth); 942 if ((fin->fin_fr = ipauth) && 943 (pass = fr_scanlist(0, ip, fin, m))) { 944 ATOMIC_INCL(fr_authstats.fas_hits); 945 } else { 946 ATOMIC_INCL(fr_authstats.fas_miss); 947 } 948 RWLOCK_EXIT(&ipf_auth); 949 } 950 951 fin->fin_fr = fr; 952 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) { 953 if (fin->fin_fi.fi_fl & FI_FRAG) { 954 if (ipfr_newfrag(ip, fin, pass) == -1) { 955 ATOMIC_INCL(frstats[out].fr_bnfr); 956 } else { 957 ATOMIC_INCL(frstats[out].fr_nfr); 958 } 959 } else { 960 ATOMIC_INCL(frstats[out].fr_cfr); 961 } 962 } 963 if (pass & FR_KEEPSTATE) { 964 if (fr_addstate(ip, fin, 0) == NULL) { 965 ATOMIC_INCL(frstats[out].fr_bads); 966 } else { 967 ATOMIC_INCL(frstats[out].fr_ads); 968 } 969 } 970 } else if (fr != NULL) { 971 pass = fr->fr_flags; 972 if (pass & FR_LOGFIRST) 973 pass &= ~(FR_LOGFIRST|FR_LOG); 974 } 975 976#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL)) 977 if (securelevel <= 0) 978#endif 979 if (fr && fr->fr_func && !(pass & FR_CALLNOW)) 980 pass = (*fr->fr_func)(pass, ip, fin); 981 982 /* 983 * Only count/translate packets which will be passed on, out the 984 * interface. 985 */ 986 if (out && (pass & FR_PASS)) { 987#ifdef USE_INET6 988 if (v == 6) 989 list = ipacct6[1][fr_active]; 990 else 991#endif 992 list = ipacct[1][fr_active]; 993 if ((fin->fin_fr = list) && 994 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) { 995 ATOMIC_INCL(frstats[1].fr_acct); 996 } 997 fin->fin_fr = fr; 998 changed = ip_natout(ip, fin); 999 } else 1000 fin->fin_fr = fr; 1001 RWLOCK_EXIT(&ipf_mutex); 1002 1003#ifdef IPFILTER_LOG 1004 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) { 1005 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) { 1006 pass |= FF_LOGNOMATCH; 1007 ATOMIC_INCL(frstats[out].fr_npkl); 1008 goto logit; 1009 } else if (((pass & FR_LOGMASK) == FR_LOGP) || 1010 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) { 1011 if ((pass & FR_LOGMASK) != FR_LOGP) 1012 pass |= FF_LOGPASS; 1013 ATOMIC_INCL(frstats[out].fr_ppkl); 1014 goto logit; 1015 } else if (((pass & FR_LOGMASK) == FR_LOGB) || 1016 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) { 1017 if ((pass & FR_LOGMASK) != FR_LOGB) 1018 pass |= FF_LOGBLOCK; 1019 ATOMIC_INCL(frstats[out].fr_bpkl); 1020logit: 1021 if (!IPLLOG(pass, ip, fin, m)) { 1022 ATOMIC_INCL(frstats[out].fr_skip); 1023 if ((pass & (FR_PASS|FR_LOGORBLOCK)) == 1024 (FR_PASS|FR_LOGORBLOCK)) 1025 pass ^= FR_PASS|FR_BLOCK; 1026 } 1027 } 1028 } 1029#endif /* IPFILTER_LOG */ 1030 1031 if ((out) && (v == 4)) 1032 ip->ip_id = htons(ip->ip_id); 1033 1034#ifdef _KERNEL 1035 /* 1036 * Only allow FR_DUP to work if a rule matched - it makes no sense to 1037 * set FR_DUP as a "default" as there are no instructions about where 1038 * to send the packet. 1039 */ 1040 if (fr && (pass & FR_DUP)) 1041# if SOLARIS 1042 mc = dupmsg(m); 1043# else 1044# ifndef linux 1045 mc = m_copy(m, 0, M_COPYALL); 1046# else 1047 ; 1048# endif 1049# endif 1050#endif 1051 if (pass & FR_PASS) { 1052 ATOMIC_INCL(frstats[out].fr_pass); 1053 } else if (pass & FR_BLOCK) { 1054 ATOMIC_INCL(frstats[out].fr_block); 1055 /* 1056 * Should we return an ICMP packet to indicate error 1057 * status passing through the packet filter ? 1058 * WARNING: ICMP error packets AND TCP RST packets should 1059 * ONLY be sent in repsonse to incoming packets. Sending them 1060 * in response to outbound packets can result in a panic on 1061 * some operating systems. 1062 */ 1063 if (!out) { 1064#ifdef _KERNEL 1065 if (pass & FR_RETICMP) { 1066 int dst; 1067 1068 if ((pass & FR_RETMASK) == FR_FAKEICMP) 1069 dst = 1; 1070 else 1071 dst = 0; 1072 send_icmp_err(ip, ICMP_UNREACH, fin, dst); 1073 ATOMIC_INCL(frstats[0].fr_ret); 1074 } else if (((pass & FR_RETMASK) == FR_RETRST) && 1075 !(fin->fin_fi.fi_fl & FI_SHORT)) { 1076 if (send_reset(ip, fin) == 0) { 1077 ATOMIC_INCL(frstats[1].fr_ret); 1078 } 1079 } 1080#else 1081 if ((pass & FR_RETMASK) == FR_RETICMP) { 1082 verbose("- ICMP unreachable sent\n"); 1083 ATOMIC_INCL(frstats[0].fr_ret); 1084 } else if ((pass & FR_RETMASK) == FR_FAKEICMP) { 1085 verbose("- forged ICMP unreachable sent\n"); 1086 ATOMIC_INCL(frstats[0].fr_ret); 1087 } else if (((pass & FR_RETMASK) == FR_RETRST) && 1088 !(fin->fin_fi.fi_fl & FI_SHORT)) { 1089 verbose("- TCP RST sent\n"); 1090 ATOMIC_INCL(frstats[1].fr_ret); 1091 } 1092#endif 1093 } else { 1094 if (pass & FR_RETRST) 1095 error = ECONNRESET; 1096 } 1097 } 1098 1099 /* 1100 * If we didn't drop off the bottom of the list of rules (and thus 1101 * the 'current' rule fr is not NULL), then we may have some extra 1102 * instructions about what to do with a packet. 1103 * Once we're finished return to our caller, freeing the packet if 1104 * we are dropping it (* BSD ONLY *). 1105 */ 1106 if ((changed == -1) && (pass & FR_PASS)) { 1107 pass &= ~FR_PASS; 1108 pass |= FR_BLOCK; 1109 } 1110#if defined(_KERNEL) 1111# if !SOLARIS 1112# if !defined(linux) 1113 if (fr) { 1114 frdest_t *fdp = &fr->fr_tif; 1115 1116 if (((pass & FR_FASTROUTE) && !out) || 1117 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) { 1118 if (ipfr_fastroute(m, fin, fdp) == 0) 1119 m = *mp = NULL; 1120 } 1121 if (mc) 1122 ipfr_fastroute(mc, fin, &fr->fr_dif); 1123 } 1124 if (!(pass & FR_PASS) && m) 1125 m_freem(m); 1126# ifdef __sgi 1127 else if (changed && up && m) 1128 m_copyback(m, 0, up, hbuf); 1129# endif 1130# endif /* !linux */ 1131# else /* !SOLARIS */ 1132 if (fr) { 1133 frdest_t *fdp = &fr->fr_tif; 1134 1135 if (((pass & FR_FASTROUTE) && !out) || 1136 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) { 1137 if (ipfr_fastroute(ip, m, mp, fin, fdp) == 0) 1138 m = *mp = NULL; 1139 } 1140 if (mc) 1141 ipfr_fastroute(ip, mc, mp, fin, &fr->fr_dif); 1142 } 1143# endif /* !SOLARIS */ 1144 return (pass & FR_PASS) ? 0 : error; 1145#else /* _KERNEL */ 1146 if (pass & FR_NOMATCH) 1147 return 1; 1148 if (pass & FR_PASS) 1149 return 0; 1150 if (pass & FR_AUTH) 1151 return -2; 1152 return -1; 1153#endif /* _KERNEL */ 1154} 1155 1156 1157/* 1158 * ipf_cksum 1159 * addr should be 16bit aligned and len is in bytes. 1160 * length is in bytes 1161 */ 1162u_short ipf_cksum(addr, len) 1163register u_short *addr; 1164register int len; 1165{ 1166 register u_32_t sum = 0; 1167 1168 for (sum = 0; len > 1; len -= 2) 1169 sum += *addr++; 1170 1171 /* mop up an odd byte, if necessary */ 1172 if (len == 1) 1173 sum += *(u_char *)addr; 1174 1175 /* 1176 * add back carry outs from top 16 bits to low 16 bits 1177 */ 1178 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 1179 sum += (sum >> 16); /* add carry */ 1180 return (u_short)(~sum); 1181} 1182 1183 1184/* 1185 * NB: This function assumes we've pullup'd enough for all of the IP header 1186 * and the TCP header. We also assume that data blocks aren't allocated in 1187 * odd sizes. 1188 */ 1189u_short fr_tcpsum(m, ip, tcp) 1190mb_t *m; 1191ip_t *ip; 1192tcphdr_t *tcp; 1193{ 1194 u_short *sp, slen, ts; 1195 u_int sum, sum2; 1196 int hlen; 1197 1198 /* 1199 * Add up IP Header portion 1200 */ 1201 hlen = ip->ip_hl << 2; 1202 slen = ip->ip_len - hlen; 1203 sum = htons((u_short)ip->ip_p); 1204 sum += htons(slen); 1205 sp = (u_short *)&ip->ip_src; 1206 sum += *sp++; /* ip_src */ 1207 sum += *sp++; 1208 sum += *sp++; /* ip_dst */ 1209 sum += *sp++; 1210 ts = tcp->th_sum; 1211 tcp->th_sum = 0; 1212#ifdef KERNEL 1213# if SOLARIS 1214 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */ 1215 sum2 = (sum2 & 0xffff) + (sum2 >> 16); 1216 sum2 = ~sum2 & 0xffff; 1217# else /* SOLARIS */ 1218# if defined(BSD) || defined(sun) 1219# if BSD >= 199306 1220 m->m_data += hlen; 1221# else 1222 m->m_off += hlen; 1223# endif 1224 m->m_len -= hlen; 1225 sum2 = in_cksum(m, slen); 1226 m->m_len += hlen; 1227# if BSD >= 199306 1228 m->m_data -= hlen; 1229# else 1230 m->m_off -= hlen; 1231# endif 1232 /* 1233 * Both sum and sum2 are partial sums, so combine them together. 1234 */ 1235 sum = (sum & 0xffff) + (sum >> 16); 1236 sum = ~sum & 0xffff; 1237 sum2 += sum; 1238 sum2 = (sum2 & 0xffff) + (sum2 >> 16); 1239# else /* defined(BSD) || defined(sun) */ 1240{ 1241 union { 1242 u_char c[2]; 1243 u_short s; 1244 } bytes; 1245 u_short len = ip->ip_len; 1246# if defined(__sgi) 1247 int add; 1248# endif 1249 1250 /* 1251 * Add up IP Header portion 1252 */ 1253 sp = (u_short *)&ip->ip_src; 1254 len -= (ip->ip_hl << 2); 1255 sum = ntohs(IPPROTO_TCP); 1256 sum += htons(len); 1257 sum += *sp++; /* ip_src */ 1258 sum += *sp++; 1259 sum += *sp++; /* ip_dst */ 1260 sum += *sp++; 1261 if (sp != (u_short *)tcp) 1262 sp = (u_short *)tcp; 1263 sum += *sp++; /* sport */ 1264 sum += *sp++; /* dport */ 1265 sum += *sp++; /* seq */ 1266 sum += *sp++; 1267 sum += *sp++; /* ack */ 1268 sum += *sp++; 1269 sum += *sp++; /* off */ 1270 sum += *sp++; /* win */ 1271 sum += *sp++; /* Skip over checksum */ 1272 sum += *sp++; /* urp */ 1273 1274# ifdef __sgi 1275 /* 1276 * In case we had to copy the IP & TCP header out of mbufs, 1277 * skip over the mbuf bits which are the header 1278 */ 1279 if ((caddr_t)ip != mtod(m, caddr_t)) { 1280 hlen = (caddr_t)sp - (caddr_t)ip; 1281 while (hlen) { 1282 add = MIN(hlen, m->m_len); 1283 sp = (u_short *)(mtod(m, caddr_t) + add); 1284 hlen -= add; 1285 if (add == m->m_len) { 1286 m = m->m_next; 1287 if (!hlen) { 1288 if (!m) 1289 break; 1290 sp = mtod(m, u_short *); 1291 } 1292 PANIC((!m),("fr_tcpsum(1): not enough data")); 1293 } 1294 } 1295 } 1296# endif 1297 1298 if (!(len -= sizeof(*tcp))) 1299 goto nodata; 1300 while (len > 1) { 1301 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) { 1302 m = m->m_next; 1303 PANIC((!m),("fr_tcpsum(2): not enough data")); 1304 sp = mtod(m, u_short *); 1305 } 1306 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) { 1307 bytes.c[0] = *(u_char *)sp; 1308 m = m->m_next; 1309 PANIC((!m),("fr_tcpsum(3): not enough data")); 1310 sp = mtod(m, u_short *); 1311 bytes.c[1] = *(u_char *)sp; 1312 sum += bytes.s; 1313 sp = (u_short *)((u_char *)sp + 1); 1314 } 1315 if ((u_long)sp & 1) { 1316 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s)); 1317 sum += bytes.s; 1318 } else 1319 sum += *sp++; 1320 len -= 2; 1321 } 1322 if (len) 1323 sum += ntohs(*(u_char *)sp << 8); 1324nodata: 1325 while (sum > 0xffff) 1326 sum = (sum & 0xffff) + (sum >> 16); 1327 sum2 = (u_short)(~sum & 0xffff); 1328} 1329# endif /* defined(BSD) || defined(sun) */ 1330# endif /* SOLARIS */ 1331#else /* KERNEL */ 1332 sum2 = 0; 1333#endif /* KERNEL */ 1334 tcp->th_sum = ts; 1335 return sum2; 1336} 1337 1338 1339#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) ) 1340/* 1341 * Copyright (c) 1982, 1986, 1988, 1991, 1993 1342 * The Regents of the University of California. All rights reserved. 1343 * 1344 * Redistribution and use in source and binary forms, with or without 1345 * modification, are permitted provided that the following conditions 1346 * are met: 1347 * 1. Redistributions of source code must retain the above copyright 1348 * notice, this list of conditions and the following disclaimer. 1349 * 2. Redistributions in binary form must reproduce the above copyright 1350 * notice, this list of conditions and the following disclaimer in the 1351 * documentation and/or other materials provided with the distribution. 1352 * 3. All advertising materials mentioning features or use of this software 1353 * must display the following acknowledgement: 1354 * This product includes software developed by the University of 1355 * California, Berkeley and its contributors. 1356 * 4. Neither the name of the University nor the names of its contributors 1357 * may be used to endorse or promote products derived from this software 1358 * without specific prior written permission. 1359 * 1360 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1361 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1362 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1363 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 1364 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1365 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 1366 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 1367 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 1368 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 1369 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 1370 * SUCH DAMAGE. 1371 * 1372 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94 1373 * $Id: fil.c,v 2.35.2.18 2000/07/19 13:13:40 darrenr Exp $ 1374 */ 1375/* 1376 * Copy data from an mbuf chain starting "off" bytes from the beginning, 1377 * continuing for "len" bytes, into the indicated buffer. 1378 */ 1379void 1380m_copydata(m, off, len, cp) 1381 register mb_t *m; 1382 register int off; 1383 register int len; 1384 caddr_t cp; 1385{ 1386 register unsigned count; 1387 1388 if (off < 0 || len < 0) 1389 panic("m_copydata"); 1390 while (off > 0) { 1391 if (m == 0) 1392 panic("m_copydata"); 1393 if (off < m->m_len) 1394 break; 1395 off -= m->m_len; 1396 m = m->m_next; 1397 } 1398 while (len > 0) { 1399 if (m == 0) 1400 panic("m_copydata"); 1401 count = MIN(m->m_len - off, len); 1402 bcopy(mtod(m, caddr_t) + off, cp, count); 1403 len -= count; 1404 cp += count; 1405 off = 0; 1406 m = m->m_next; 1407 } 1408} 1409 1410 1411# ifndef linux 1412/* 1413 * Copy data from a buffer back into the indicated mbuf chain, 1414 * starting "off" bytes from the beginning, extending the mbuf 1415 * chain if necessary. 1416 */ 1417void 1418m_copyback(m0, off, len, cp) 1419 struct mbuf *m0; 1420 register int off; 1421 register int len; 1422 caddr_t cp; 1423{ 1424 register int mlen; 1425 register struct mbuf *m = m0, *n; 1426 int totlen = 0; 1427 1428 if (m0 == 0) 1429 return; 1430 while (off > (mlen = m->m_len)) { 1431 off -= mlen; 1432 totlen += mlen; 1433 if (m->m_next == 0) { 1434 n = m_getclr(M_DONTWAIT, m->m_type); 1435 if (n == 0) 1436 goto out; 1437 n->m_len = min(MLEN, len + off); 1438 m->m_next = n; 1439 } 1440 m = m->m_next; 1441 } 1442 while (len > 0) { 1443 mlen = min (m->m_len - off, len); 1444 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen); 1445 cp += mlen; 1446 len -= mlen; 1447 mlen += off; 1448 off = 0; 1449 totlen += mlen; 1450 if (len == 0) 1451 break; 1452 if (m->m_next == 0) { 1453 n = m_get(M_DONTWAIT, m->m_type); 1454 if (n == 0) 1455 break; 1456 n->m_len = min(MLEN, len); 1457 m->m_next = n; 1458 } 1459 m = m->m_next; 1460 } 1461out: 1462#if 0 1463 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen)) 1464 m->m_pkthdr.len = totlen; 1465#endif 1466 return; 1467} 1468# endif /* linux */ 1469#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */ 1470 1471 1472frgroup_t *fr_findgroup(num, flags, which, set, fgpp) 1473u_32_t num, flags; 1474minor_t which; 1475int set; 1476frgroup_t ***fgpp; 1477{ 1478 frgroup_t *fg, **fgp; 1479 1480 if (which == IPL_LOGAUTH) 1481 fgp = &ipfgroups[2][set]; 1482 else if (flags & FR_ACCOUNT) 1483 fgp = &ipfgroups[1][set]; 1484 else if (flags & (FR_OUTQUE|FR_INQUE)) 1485 fgp = &ipfgroups[0][set]; 1486 else 1487 return NULL; 1488 num &= 0xffff; 1489 1490 while ((fg = *fgp)) 1491 if (fg->fg_num == num) 1492 break; 1493 else 1494 fgp = &fg->fg_next; 1495 if (fgpp) 1496 *fgpp = fgp; 1497 return fg; 1498} 1499 1500 1501frgroup_t *fr_addgroup(num, fp, which, set) 1502u_32_t num; 1503frentry_t *fp; 1504minor_t which; 1505int set; 1506{ 1507 frgroup_t *fg, **fgp; 1508 1509 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp))) 1510 return fg; 1511 1512 KMALLOC(fg, frgroup_t *); 1513 if (fg) { 1514 fg->fg_num = num; 1515 fg->fg_next = *fgp; 1516 fg->fg_head = fp; 1517 fg->fg_start = &fp->fr_grp; 1518 *fgp = fg; 1519 } 1520 return fg; 1521} 1522 1523 1524void fr_delgroup(num, flags, which, set) 1525u_32_t num, flags; 1526minor_t which; 1527int set; 1528{ 1529 frgroup_t *fg, **fgp; 1530 1531 if (!(fg = fr_findgroup(num, flags, which, set, &fgp))) 1532 return; 1533 1534 *fgp = fg->fg_next; 1535 KFREE(fg); 1536} 1537 1538 1539 1540/* 1541 * recursively flush rules from the list, descending groups as they are 1542 * encountered. if a rule is the head of a group and it has lost all its 1543 * group members, then also delete the group reference. 1544 */ 1545static int frflushlist(set, unit, nfreedp, listp) 1546int set; 1547minor_t unit; 1548int *nfreedp; 1549frentry_t **listp; 1550{ 1551 register int freed = 0, i; 1552 register frentry_t *fp; 1553 1554 while ((fp = *listp)) { 1555 *listp = fp->fr_next; 1556 if (fp->fr_grp) { 1557 i = frflushlist(set, unit, nfreedp, &fp->fr_grp); 1558 MUTEX_ENTER(&ipf_rw); 1559 fp->fr_ref -= i; 1560 MUTEX_EXIT(&ipf_rw); 1561 } 1562 1563 ATOMIC_DEC32(fp->fr_ref); 1564 if (fp->fr_grhead) { 1565 fr_delgroup(fp->fr_grhead, fp->fr_flags, 1566 unit, set); 1567 fp->fr_grhead = 0; 1568 } 1569 if (fp->fr_ref == 0) { 1570 KFREE(fp); 1571 freed++; 1572 } else 1573 fp->fr_next = NULL; 1574 } 1575 *nfreedp += freed; 1576 return freed; 1577} 1578 1579 1580int frflush(unit, flags) 1581minor_t unit; 1582int flags; 1583{ 1584 int flushed = 0, set; 1585 1586 if (unit != IPL_LOGIPF) 1587 return 0; 1588 WRITE_ENTER(&ipf_mutex); 1589 bzero((char *)frcache, sizeof(frcache[0]) * 2); 1590 1591 set = fr_active; 1592 if (flags & FR_INACTIVE) 1593 set = 1 - set; 1594 1595 if (flags & FR_OUTQUE) { 1596#ifdef USE_INET6 1597 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]); 1598 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]); 1599#endif 1600 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]); 1601 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]); 1602 } 1603 if (flags & FR_INQUE) { 1604#ifdef USE_INET6 1605 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]); 1606 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]); 1607#endif 1608 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]); 1609 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]); 1610 } 1611 RWLOCK_EXIT(&ipf_mutex); 1612 return flushed; 1613} 1614 1615 1616char *memstr(src, dst, slen, dlen) 1617char *src, *dst; 1618int slen, dlen; 1619{ 1620 char *s = NULL; 1621 1622 while (dlen >= slen) { 1623 if (bcmp(src, dst, slen) == 0) { 1624 s = dst; 1625 break; 1626 } 1627 dst++; 1628 dlen--; 1629 } 1630 return s; 1631} 1632 1633 1634void fixskip(listp, rp, addremove) 1635frentry_t **listp, *rp; 1636int addremove; 1637{ 1638 frentry_t *fp; 1639 int rules = 0, rn = 0; 1640 1641 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++) 1642 ; 1643 1644 if (!fp) 1645 return; 1646 1647 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++) 1648 if (fp->fr_skip && (rn + fp->fr_skip >= rules)) 1649 fp->fr_skip += addremove; 1650} 1651 1652 1653#ifdef _KERNEL 1654/* 1655 * count consecutive 1's in bit mask. If the mask generated by counting 1656 * consecutive 1's is different to that passed, return -1, else return # 1657 * of bits. 1658 */ 1659int countbits(ip) 1660u_32_t ip; 1661{ 1662 u_32_t ipn; 1663 int cnt = 0, i, j; 1664 1665 ip = ipn = ntohl(ip); 1666 for (i = 32; i; i--, ipn *= 2) 1667 if (ipn & 0x80000000) 1668 cnt++; 1669 else 1670 break; 1671 ipn = 0; 1672 for (i = 32, j = cnt; i; i--, j--) { 1673 ipn *= 2; 1674 if (j > 0) 1675 ipn++; 1676 } 1677 if (ipn == ip) 1678 return cnt; 1679 return -1; 1680} 1681 1682 1683/* 1684 * return the first IP Address associated with an interface 1685 */ 1686int fr_ifpaddr(v, ifptr, inp) 1687int v; 1688void *ifptr; 1689struct in_addr *inp; 1690{ 1691# ifdef USE_INET6 1692 struct in6_addr *inp6 = NULL; 1693# endif 1694# if SOLARIS 1695 ill_t *ill = ifptr; 1696# else 1697 struct ifnet *ifp = ifptr; 1698# endif 1699 struct in_addr in; 1700 1701# if SOLARIS 1702# ifdef USE_INET6 1703 if (v == 6) { 1704 struct in6_addr in6; 1705 1706 /* 1707 * First is always link local. 1708 */ 1709 if (ill->ill_ipif->ipif_next) 1710 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr; 1711 else 1712 bzero((char *)&in6, sizeof(in6)); 1713 bcopy((char *)&in6, (char *)inp, sizeof(in6)); 1714 } else 1715# endif 1716 { 1717 in.s_addr = ill->ill_ipif->ipif_local_addr; 1718 *inp = in; 1719 } 1720# else /* SOLARIS */ 1721# if linux 1722 ; 1723# else /* linux */ 1724 struct sockaddr_in *sin; 1725 struct ifaddr *ifa; 1726 1727# if (__FreeBSD_version >= 300000) 1728 ifa = TAILQ_FIRST(&ifp->if_addrhead); 1729# else 1730# if defined(__NetBSD__) || defined(__OpenBSD__) 1731 ifa = ifp->if_addrlist.tqh_first; 1732# else 1733# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */ 1734 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa; 1735# else 1736 ifa = ifp->if_addrlist; 1737# endif 1738# endif /* __NetBSD__ || __OpenBSD__ */ 1739# endif /* __FreeBSD_version >= 300000 */ 1740# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK)) 1741 sin = (struct sockaddr_in *)&ifa->ifa_addr; 1742# else 1743 sin = (struct sockaddr_in *)ifa->ifa_addr; 1744 while (sin && ifa) { 1745 if ((v == 4) && (sin->sin_family == AF_INET)) 1746 break; 1747# ifdef USE_INET6 1748 if ((v == 6) && (sin->sin_family == AF_INET6)) { 1749 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1750 if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1751 !IN6_IS_ADDR_LOOPBACK(inp6)) 1752 break; 1753 } 1754# endif 1755# if (__FreeBSD_version >= 300000) 1756 ifa = TAILQ_NEXT(ifa, ifa_link); 1757# else 1758# if defined(__NetBSD__) || defined(__OpenBSD__) 1759 ifa = ifa->ifa_list.tqe_next; 1760# else 1761 ifa = ifa->ifa_next; 1762# endif 1763# endif /* __FreeBSD_version >= 300000 */ 1764 if (ifa) 1765 sin = (struct sockaddr_in *)ifa->ifa_addr; 1766 } 1767 if (ifa == NULL) 1768 sin = NULL; 1769 if (sin == NULL) 1770 return -1; 1771# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */ 1772# ifdef USE_INET6 1773 if (v == 6) 1774 bcopy((char *)inp6, (char *)inp, sizeof(*inp6)); 1775 else 1776# endif 1777 { 1778 in = sin->sin_addr; 1779 *inp = in; 1780 } 1781# endif /* linux */ 1782# endif /* SOLARIS */ 1783 return 0; 1784} 1785 1786 1787static void frsynclist(fr) 1788register frentry_t *fr; 1789{ 1790 for (; fr; fr = fr->fr_next) { 1791 if (fr->fr_ifa != NULL) { 1792 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v); 1793 if (fr->fr_ifa == NULL) 1794 fr->fr_ifa = (void *)-1; 1795 } 1796 if (fr->fr_grp) 1797 frsynclist(fr->fr_grp); 1798 } 1799} 1800 1801 1802void frsync() 1803{ 1804# if !SOLARIS 1805 register struct ifnet *ifp; 1806 1807# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \ 1808 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)) 1809# if (NetBSD >= 199905) || defined(__OpenBSD__) 1810 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 1811# else 1812 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) 1813# endif 1814# else 1815 for (ifp = ifnet; ifp; ifp = ifp->if_next) 1816# endif 1817 { 1818 ip_natsync(ifp); 1819 ip_statesync(ifp); 1820 } 1821 ip_natsync((struct ifnet *)-1); 1822# endif 1823 1824 WRITE_ENTER(&ipf_mutex); 1825 frsynclist(ipacct[0][fr_active]); 1826 frsynclist(ipacct[1][fr_active]); 1827 frsynclist(ipfilter[0][fr_active]); 1828 frsynclist(ipfilter[1][fr_active]); 1829#ifdef USE_INET6 1830 frsynclist(ipacct6[0][fr_active]); 1831 frsynclist(ipacct6[1][fr_active]); 1832 frsynclist(ipfilter6[0][fr_active]); 1833 frsynclist(ipfilter6[1][fr_active]); 1834#endif 1835 RWLOCK_EXIT(&ipf_mutex); 1836} 1837 1838 1839/* 1840 * In the functions below, bcopy() is called because the pointer being 1841 * copied _from_ in this instance is a pointer to a char buf (which could 1842 * end up being unaligned) and on the kernel's local stack. 1843 */ 1844int ircopyptr(a, b, c) 1845void *a, *b; 1846size_t c; 1847{ 1848 caddr_t ca; 1849 int err; 1850 1851#if SOLARIS 1852 copyin(a, &ca, sizeof(ca)); 1853#else 1854 bcopy(a, &ca, sizeof(ca)); 1855#endif 1856 err = copyin(ca, b, c); 1857 return err; 1858} 1859 1860 1861int iwcopyptr(a, b, c) 1862void *a, *b; 1863size_t c; 1864{ 1865 caddr_t ca; 1866 int err; 1867 1868#if SOLARIS 1869 copyin(b, &ca, sizeof(ca)); 1870#else 1871 bcopy(b, &ca, sizeof(ca)); 1872#endif 1873 err = copyout(a, ca, c); 1874 return err; 1875} 1876 1877#else /* _KERNEL */ 1878 1879 1880/* 1881 * return the first IP Address associated with an interface 1882 */ 1883int fr_ifpaddr(v, ifptr, inp) 1884int v; 1885void *ifptr; 1886struct in_addr *inp; 1887{ 1888 return 0; 1889} 1890 1891 1892int ircopyptr(a, b, c) 1893void *a, *b; 1894size_t c; 1895{ 1896 caddr_t ca; 1897 1898 bcopy(a, &ca, sizeof(ca)); 1899 bcopy(ca, b, c); 1900 return 0; 1901} 1902 1903 1904int iwcopyptr(a, b, c) 1905void *a, *b; 1906size_t c; 1907{ 1908 caddr_t ca; 1909 1910 bcopy(b, &ca, sizeof(ca)); 1911 bcopy(a, ca, c); 1912 return 0; 1913} 1914 1915 1916#endif 1917 1918 1919int fr_lock(data, lockp) 1920caddr_t data; 1921int *lockp; 1922{ 1923 int arg, error; 1924 1925 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg)); 1926 if (!error) { 1927 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp)); 1928 if (!error) 1929 *lockp = arg; 1930 } 1931 return error; 1932} 1933 1934 1935void fr_getstat(fiop) 1936friostat_t *fiop; 1937{ 1938 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2); 1939 fiop->f_locks[0] = fr_state_lock; 1940 fiop->f_locks[1] = fr_nat_lock; 1941 fiop->f_locks[2] = fr_frag_lock; 1942 fiop->f_locks[3] = fr_auth_lock; 1943 fiop->f_fin[0] = ipfilter[0][0]; 1944 fiop->f_fin[1] = ipfilter[0][1]; 1945 fiop->f_fout[0] = ipfilter[1][0]; 1946 fiop->f_fout[1] = ipfilter[1][1]; 1947 fiop->f_acctin[0] = ipacct[0][0]; 1948 fiop->f_acctin[1] = ipacct[0][1]; 1949 fiop->f_acctout[0] = ipacct[1][0]; 1950 fiop->f_acctout[1] = ipacct[1][1]; 1951#ifdef USE_INET6 1952 fiop->f_fin6[0] = ipfilter6[0][0]; 1953 fiop->f_fin6[1] = ipfilter6[0][1]; 1954 fiop->f_fout6[0] = ipfilter6[1][0]; 1955 fiop->f_fout6[1] = ipfilter6[1][1]; 1956 fiop->f_acctin6[0] = ipacct6[0][0]; 1957 fiop->f_acctin6[1] = ipacct6[0][1]; 1958 fiop->f_acctout6[0] = ipacct6[1][0]; 1959 fiop->f_acctout6[1] = ipacct6[1][1]; 1960#endif 1961 fiop->f_active = fr_active; 1962 fiop->f_froute[0] = ipl_frouteok[0]; 1963 fiop->f_froute[1] = ipl_frouteok[1]; 1964 1965 fiop->f_running = fr_running; 1966 fiop->f_groups[0][0] = ipfgroups[0][0]; 1967 fiop->f_groups[0][1] = ipfgroups[0][1]; 1968 fiop->f_groups[1][0] = ipfgroups[1][0]; 1969 fiop->f_groups[1][1] = ipfgroups[1][1]; 1970 fiop->f_groups[2][0] = ipfgroups[2][0]; 1971 fiop->f_groups[2][1] = ipfgroups[2][1]; 1972#ifdef IPFILTER_LOG 1973 fiop->f_logging = 1; 1974#else 1975 fiop->f_logging = 0; 1976#endif 1977 fiop->f_defpass = fr_pass; 1978 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version)); 1979} 1980 1981 1982#ifdef USE_INET6 1983int icmptoicmp6types[ICMP_MAXTYPE+1] = { 1984 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */ 1985 -1, /* 1: UNUSED */ 1986 -1, /* 2: UNUSED */ 1987 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */ 1988 -1, /* 4: ICMP_SOURCEQUENCH */ 1989 ND_REDIRECT, /* 5: ICMP_REDIRECT */ 1990 -1, /* 6: UNUSED */ 1991 -1, /* 7: UNUSED */ 1992 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */ 1993 -1, /* 9: UNUSED */ 1994 -1, /* 10: UNUSED */ 1995 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */ 1996 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */ 1997 -1, /* 13: ICMP_TSTAMP */ 1998 -1, /* 14: ICMP_TSTAMPREPLY */ 1999 -1, /* 15: ICMP_IREQ */ 2000 -1, /* 16: ICMP_IREQREPLY */ 2001 -1, /* 17: ICMP_MASKREQ */ 2002 -1, /* 18: ICMP_MASKREPLY */ 2003}; 2004 2005 2006int icmptoicmp6unreach[ICMP_MAX_UNREACH] = { 2007 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */ 2008 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */ 2009 -1, /* 2: ICMP_UNREACH_PROTOCOL */ 2010 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */ 2011 -1, /* 4: ICMP_UNREACH_NEEDFRAG */ 2012 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */ 2013 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */ 2014 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */ 2015 -1, /* 8: ICMP_UNREACH_ISOLATED */ 2016 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */ 2017 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */ 2018 -1, /* 11: ICMP_UNREACH_TOSNET */ 2019 -1, /* 12: ICMP_UNREACH_TOSHOST */ 2020 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */ 2021}; 2022#endif 2023