Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/xform_ipip.c
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1 /* $FreeBSD: releng/9.2/sys/netipsec/xform_ipip.c 252693 2013-07-04 08:59:34Z ae $ */ 2 /* $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */ 3 /*- 4 * The authors of this code are John Ioannidis (ji@tla.org), 5 * Angelos D. Keromytis (kermit@csd.uch.gr) and 6 * Niels Provos (provos@physnet.uni-hamburg.de). 7 * 8 * The original version of this code was written by John Ioannidis 9 * for BSD/OS in Athens, Greece, in November 1995. 10 * 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 12 * by Angelos D. Keromytis. 13 * 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 15 * and Niels Provos. 16 * 17 * Additional features in 1999 by Angelos D. Keromytis. 18 * 19 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 20 * Angelos D. Keromytis and Niels Provos. 21 * Copyright (c) 2001, Angelos D. Keromytis. 22 * 23 * Permission to use, copy, and modify this software with or without fee 24 * is hereby granted, provided that this entire notice is included in 25 * all copies of any software which is or includes a copy or 26 * modification of this software. 27 * You may use this code under the GNU public license if you so wish. Please 28 * contribute changes back to the authors under this freer than GPL license 29 * so that we may further the use of strong encryption without limitations to 30 * all. 31 * 32 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 33 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 34 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 35 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 36 * PURPOSE. 37 */ 38 39 /* 40 * IP-inside-IP processing 41 */ 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_enc.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/kernel.h> 51 #include <sys/protosw.h> 52 #include <sys/sysctl.h> 53 54 #include <net/if.h> 55 #include <net/pfil.h> 56 #include <net/route.h> 57 #include <net/netisr.h> 58 #include <net/vnet.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/in_var.h> 63 #include <netinet/ip.h> 64 #include <netinet/ip_ecn.h> 65 #include <netinet/ip_var.h> 66 #include <netinet/ip_encap.h> 67 #ifdef MROUTING 68 #include <netinet/ip_mroute.h> 69 #endif 70 71 #include <netipsec/ipsec.h> 72 #include <netipsec/xform.h> 73 74 #include <netipsec/ipip_var.h> 75 76 #ifdef INET6 77 #include <netinet/ip6.h> 78 #include <netipsec/ipsec6.h> 79 #include <netinet6/ip6_ecn.h> 80 #include <netinet6/in6_var.h> 81 #include <netinet6/ip6protosw.h> 82 #endif 83 84 #include <netipsec/key.h> 85 #include <netipsec/key_debug.h> 86 87 #include <machine/stdarg.h> 88 89 /* 90 * We can control the acceptance of IP4 packets by altering the sysctl 91 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance. 92 */ 93 VNET_DEFINE(int, ipip_allow) = 0; 94 VNET_DEFINE(struct ipipstat, ipipstat); 95 96 SYSCTL_DECL(_net_inet_ipip); 97 SYSCTL_VNET_INT(_net_inet_ipip, OID_AUTO, 98 ipip_allow, CTLFLAG_RW, &VNET_NAME(ipip_allow), 0, ""); 99 SYSCTL_VNET_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 100 stats, CTLFLAG_RD, &VNET_NAME(ipipstat), ipipstat, ""); 101 102 /* XXX IPCOMP */ 103 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 104 105 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 106 107 #ifdef INET6 108 /* 109 * Really only a wrapper for ipip_input(), for use with IPv6. 110 */ 111 int 112 ip4_input6(struct mbuf **m, int *offp, int proto) 113 { 114 #if 0 115 /* If we do not accept IP-in-IP explicitly, drop. */ 116 if (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 117 DPRINTF(("%s: dropped due to policy\n", __func__)); 118 IPIPSTAT_INC(ipips_pdrops); 119 m_freem(*m); 120 return IPPROTO_DONE; 121 } 122 #endif 123 _ipip_input(*m, *offp, NULL); 124 return IPPROTO_DONE; 125 } 126 #endif /* INET6 */ 127 128 #ifdef INET 129 /* 130 * Really only a wrapper for ipip_input(), for use with IPv4. 131 */ 132 void 133 ip4_input(struct mbuf *m, int off) 134 { 135 #if 0 136 /* If we do not accept IP-in-IP explicitly, drop. */ 137 if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) { 138 DPRINTF(("%s: dropped due to policy\n", __func__)); 139 IPIPSTAT_INC(ipips_pdrops); 140 m_freem(m); 141 return; 142 } 143 #endif 144 _ipip_input(m, off, NULL); 145 } 146 #endif /* INET */ 147 148 /* 149 * ipip_input gets called when we receive an IP{46} encapsulated packet, 150 * either because we got it at a real interface, or because AH or ESP 151 * were being used in tunnel mode (in which case the rcvif element will 152 * contain the address of the encX interface associated with the tunnel. 153 */ 154 155 static void 156 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 157 { 158 #ifdef INET 159 register struct sockaddr_in *sin; 160 #endif 161 register struct ifnet *ifp; 162 register struct ifaddr *ifa; 163 struct ip *ipo; 164 #ifdef INET6 165 register struct sockaddr_in6 *sin6; 166 struct ip6_hdr *ip6 = NULL; 167 u_int8_t itos; 168 #endif 169 u_int8_t nxt; 170 int isr; 171 u_int8_t otos; 172 u_int8_t v; 173 int hlen; 174 175 IPIPSTAT_INC(ipips_ipackets); 176 177 m_copydata(m, 0, 1, &v); 178 179 switch (v >> 4) { 180 #ifdef INET 181 case 4: 182 hlen = sizeof(struct ip); 183 break; 184 #endif /* INET */ 185 #ifdef INET6 186 case 6: 187 hlen = sizeof(struct ip6_hdr); 188 break; 189 #endif 190 default: 191 IPIPSTAT_INC(ipips_family); 192 m_freem(m); 193 return /* EAFNOSUPPORT */; 194 } 195 196 /* Bring the IP header in the first mbuf, if not there already */ 197 if (m->m_len < hlen) { 198 if ((m = m_pullup(m, hlen)) == NULL) { 199 DPRINTF(("%s: m_pullup (1) failed\n", __func__)); 200 IPIPSTAT_INC(ipips_hdrops); 201 return; 202 } 203 } 204 205 ipo = mtod(m, struct ip *); 206 207 #ifdef MROUTING 208 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 209 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 210 ipip_mroute_input (m, iphlen); 211 return; 212 } 213 } 214 #endif /* MROUTING */ 215 216 /* Keep outer ecn field. */ 217 switch (v >> 4) { 218 #ifdef INET 219 case 4: 220 otos = ipo->ip_tos; 221 break; 222 #endif /* INET */ 223 #ifdef INET6 224 case 6: 225 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 226 break; 227 #endif 228 default: 229 panic("ipip_input: unknown ip version %u (outer)", v>>4); 230 } 231 232 /* Remove outer IP header */ 233 m_adj(m, iphlen); 234 235 /* Sanity check */ 236 if (m->m_pkthdr.len < sizeof(struct ip)) { 237 IPIPSTAT_INC(ipips_hdrops); 238 m_freem(m); 239 return; 240 } 241 242 m_copydata(m, 0, 1, &v); 243 244 switch (v >> 4) { 245 #ifdef INET 246 case 4: 247 hlen = sizeof(struct ip); 248 break; 249 #endif /* INET */ 250 251 #ifdef INET6 252 case 6: 253 hlen = sizeof(struct ip6_hdr); 254 break; 255 #endif 256 default: 257 IPIPSTAT_INC(ipips_family); 258 m_freem(m); 259 return; /* EAFNOSUPPORT */ 260 } 261 262 /* 263 * Bring the inner IP header in the first mbuf, if not there already. 264 */ 265 if (m->m_len < hlen) { 266 if ((m = m_pullup(m, hlen)) == NULL) { 267 DPRINTF(("%s: m_pullup (2) failed\n", __func__)); 268 IPIPSTAT_INC(ipips_hdrops); 269 return; 270 } 271 } 272 273 /* 274 * RFC 1853 specifies that the inner TTL should not be touched on 275 * decapsulation. There's no reason this comment should be here, but 276 * this is as good as any a position. 277 */ 278 279 /* Some sanity checks in the inner IP header */ 280 switch (v >> 4) { 281 #ifdef INET 282 case 4: 283 ipo = mtod(m, struct ip *); 284 nxt = ipo->ip_p; 285 ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos); 286 break; 287 #endif /* INET */ 288 #ifdef INET6 289 case 6: 290 ip6 = (struct ip6_hdr *) ipo; 291 nxt = ip6->ip6_nxt; 292 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 293 ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos); 294 ip6->ip6_flow &= ~htonl(0xff << 20); 295 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 296 break; 297 #endif 298 default: 299 panic("ipip_input: unknown ip version %u (inner)", v>>4); 300 } 301 302 /* Check for local address spoofing. */ 303 if ((m->m_pkthdr.rcvif == NULL || 304 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 305 V_ipip_allow != 2) { 306 IFNET_RLOCK_NOSLEEP(); 307 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 308 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 309 #ifdef INET 310 if (ipo) { 311 if (ifa->ifa_addr->sa_family != 312 AF_INET) 313 continue; 314 315 sin = (struct sockaddr_in *) ifa->ifa_addr; 316 317 if (sin->sin_addr.s_addr == 318 ipo->ip_src.s_addr) { 319 IPIPSTAT_INC(ipips_spoof); 320 m_freem(m); 321 IFNET_RUNLOCK_NOSLEEP(); 322 return; 323 } 324 } 325 #endif /* INET */ 326 327 #ifdef INET6 328 if (ip6) { 329 if (ifa->ifa_addr->sa_family != 330 AF_INET6) 331 continue; 332 333 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 334 335 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 336 IPIPSTAT_INC(ipips_spoof); 337 m_freem(m); 338 IFNET_RUNLOCK_NOSLEEP(); 339 return; 340 } 341 342 } 343 #endif /* INET6 */ 344 } 345 } 346 IFNET_RUNLOCK_NOSLEEP(); 347 } 348 349 /* Statistics */ 350 IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen); 351 352 #ifdef DEV_ENC 353 switch (v >> 4) { 354 #ifdef INET 355 case 4: 356 ipsec_bpf(m, NULL, AF_INET, ENC_IN|ENC_AFTER); 357 break; 358 #endif 359 #ifdef INET6 360 case 6: 361 ipsec_bpf(m, NULL, AF_INET6, ENC_IN|ENC_AFTER); 362 break; 363 #endif 364 default: 365 panic("%s: bogus ip version %u", __func__, v>>4); 366 } 367 /* pass the mbuf to enc0 for packet filtering */ 368 if (ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER) != 0) 369 return; 370 #endif 371 372 /* 373 * Interface pointer stays the same; if no IPsec processing has 374 * been done (or will be done), this will point to a normal 375 * interface. Otherwise, it'll point to an enc interface, which 376 * will allow a packet filter to distinguish between secure and 377 * untrusted packets. 378 */ 379 380 switch (v >> 4) { 381 #ifdef INET 382 case 4: 383 isr = NETISR_IP; 384 break; 385 #endif 386 #ifdef INET6 387 case 6: 388 isr = NETISR_IPV6; 389 break; 390 #endif 391 default: 392 panic("%s: bogus ip version %u", __func__, v>>4); 393 } 394 395 m_addr_changed(m); 396 397 if (netisr_queue(isr, m)) { /* (0) on success. */ 398 IPIPSTAT_INC(ipips_qfull); 399 DPRINTF(("%s: packet dropped because of full queue\n", 400 __func__)); 401 } 402 } 403 404 int 405 ipip_output( 406 struct mbuf *m, 407 struct ipsecrequest *isr, 408 struct mbuf **mp, 409 int skip, 410 int protoff 411 ) 412 { 413 struct secasvar *sav; 414 u_int8_t tp, otos; 415 struct secasindex *saidx; 416 int error; 417 #if defined(INET) || defined(INET6) 418 u_int8_t itos; 419 #endif 420 #ifdef INET 421 struct ip *ipo; 422 #endif /* INET */ 423 #ifdef INET6 424 struct ip6_hdr *ip6, *ip6o; 425 #endif /* INET6 */ 426 427 sav = isr->sav; 428 IPSEC_ASSERT(sav != NULL, ("null SA")); 429 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 430 431 /* XXX Deal with empty TDB source/destination addresses. */ 432 433 m_copydata(m, 0, 1, &tp); 434 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 435 436 saidx = &sav->sah->saidx; 437 switch (saidx->dst.sa.sa_family) { 438 #ifdef INET 439 case AF_INET: 440 if (saidx->src.sa.sa_family != AF_INET || 441 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 442 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 443 DPRINTF(("%s: unspecified tunnel endpoint " 444 "address in SA %s/%08lx\n", __func__, 445 ipsec_address(&saidx->dst), 446 (u_long) ntohl(sav->spi))); 447 IPIPSTAT_INC(ipips_unspec); 448 error = EINVAL; 449 goto bad; 450 } 451 452 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 453 if (m == 0) { 454 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 455 IPIPSTAT_INC(ipips_hdrops); 456 error = ENOBUFS; 457 goto bad; 458 } 459 460 ipo = mtod(m, struct ip *); 461 462 ipo->ip_v = IPVERSION; 463 ipo->ip_hl = 5; 464 ipo->ip_len = htons(m->m_pkthdr.len); 465 ipo->ip_ttl = V_ip_defttl; 466 ipo->ip_sum = 0; 467 ipo->ip_src = saidx->src.sin.sin_addr; 468 ipo->ip_dst = saidx->dst.sin.sin_addr; 469 470 ipo->ip_id = ip_newid(); 471 472 /* If the inner protocol is IP... */ 473 switch (tp) { 474 case IPVERSION: 475 /* Save ECN notification */ 476 m_copydata(m, sizeof(struct ip) + 477 offsetof(struct ip, ip_tos), 478 sizeof(u_int8_t), (caddr_t) &itos); 479 480 ipo->ip_p = IPPROTO_IPIP; 481 482 /* 483 * We should be keeping tunnel soft-state and 484 * send back ICMPs if needed. 485 */ 486 m_copydata(m, sizeof(struct ip) + 487 offsetof(struct ip, ip_off), 488 sizeof(u_int16_t), (caddr_t) &ipo->ip_off); 489 ipo->ip_off = ntohs(ipo->ip_off); 490 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK); 491 ipo->ip_off = htons(ipo->ip_off); 492 break; 493 #ifdef INET6 494 case (IPV6_VERSION >> 4): 495 { 496 u_int32_t itos32; 497 498 /* Save ECN notification. */ 499 m_copydata(m, sizeof(struct ip) + 500 offsetof(struct ip6_hdr, ip6_flow), 501 sizeof(u_int32_t), (caddr_t) &itos32); 502 itos = ntohl(itos32) >> 20; 503 ipo->ip_p = IPPROTO_IPV6; 504 ipo->ip_off = 0; 505 break; 506 } 507 #endif /* INET6 */ 508 default: 509 goto nofamily; 510 } 511 512 otos = 0; 513 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 514 ipo->ip_tos = otos; 515 break; 516 #endif /* INET */ 517 518 #ifdef INET6 519 case AF_INET6: 520 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 521 saidx->src.sa.sa_family != AF_INET6 || 522 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 523 DPRINTF(("%s: unspecified tunnel endpoint " 524 "address in SA %s/%08lx\n", __func__, 525 ipsec_address(&saidx->dst), 526 (u_long) ntohl(sav->spi))); 527 IPIPSTAT_INC(ipips_unspec); 528 error = ENOBUFS; 529 goto bad; 530 } 531 532 /* scoped address handling */ 533 ip6 = mtod(m, struct ip6_hdr *); 534 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 535 ip6->ip6_src.s6_addr16[1] = 0; 536 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 537 ip6->ip6_dst.s6_addr16[1] = 0; 538 539 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 540 if (m == 0) { 541 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 542 IPIPSTAT_INC(ipips_hdrops); 543 error = ENOBUFS; 544 goto bad; 545 } 546 547 /* Initialize IPv6 header */ 548 ip6o = mtod(m, struct ip6_hdr *); 549 ip6o->ip6_flow = 0; 550 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 551 ip6o->ip6_vfc |= IPV6_VERSION; 552 ip6o->ip6_plen = htons(m->m_pkthdr.len); 553 ip6o->ip6_hlim = V_ip_defttl; 554 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 555 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 556 557 switch (tp) { 558 #ifdef INET 559 case IPVERSION: 560 /* Save ECN notification */ 561 m_copydata(m, sizeof(struct ip6_hdr) + 562 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 563 (caddr_t) &itos); 564 565 /* This is really IPVERSION. */ 566 ip6o->ip6_nxt = IPPROTO_IPIP; 567 break; 568 #endif /* INET */ 569 case (IPV6_VERSION >> 4): 570 { 571 u_int32_t itos32; 572 573 /* Save ECN notification. */ 574 m_copydata(m, sizeof(struct ip6_hdr) + 575 offsetof(struct ip6_hdr, ip6_flow), 576 sizeof(u_int32_t), (caddr_t) &itos32); 577 itos = ntohl(itos32) >> 20; 578 579 ip6o->ip6_nxt = IPPROTO_IPV6; 580 break; 581 } 582 default: 583 goto nofamily; 584 } 585 586 otos = 0; 587 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 588 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 589 break; 590 #endif /* INET6 */ 591 592 default: 593 nofamily: 594 DPRINTF(("%s: unsupported protocol family %u\n", __func__, 595 saidx->dst.sa.sa_family)); 596 IPIPSTAT_INC(ipips_family); 597 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 598 goto bad; 599 } 600 601 IPIPSTAT_INC(ipips_opackets); 602 *mp = m; 603 604 #ifdef INET 605 if (saidx->dst.sa.sa_family == AF_INET) { 606 #if 0 607 if (sav->tdb_xform->xf_type == XF_IP4) 608 tdb->tdb_cur_bytes += 609 m->m_pkthdr.len - sizeof(struct ip); 610 #endif 611 IPIPSTAT_ADD(ipips_obytes, 612 m->m_pkthdr.len - sizeof(struct ip)); 613 } 614 #endif /* INET */ 615 616 #ifdef INET6 617 if (saidx->dst.sa.sa_family == AF_INET6) { 618 #if 0 619 if (sav->tdb_xform->xf_type == XF_IP4) 620 tdb->tdb_cur_bytes += 621 m->m_pkthdr.len - sizeof(struct ip6_hdr); 622 #endif 623 IPIPSTAT_ADD(ipips_obytes, 624 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 625 } 626 #endif /* INET6 */ 627 628 return 0; 629 bad: 630 if (m) 631 m_freem(m); 632 *mp = NULL; 633 return (error); 634 } 635 636 #ifdef IPSEC 637 #if defined(INET) || defined(INET6) 638 static int 639 ipe4_init(struct secasvar *sav, struct xformsw *xsp) 640 { 641 sav->tdb_xform = xsp; 642 return 0; 643 } 644 645 static int 646 ipe4_zeroize(struct secasvar *sav) 647 { 648 sav->tdb_xform = NULL; 649 return 0; 650 } 651 652 static int 653 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 654 { 655 /* This is a rather serious mistake, so no conditional printing. */ 656 printf("%s: should never be called\n", __func__); 657 if (m) 658 m_freem(m); 659 return EOPNOTSUPP; 660 } 661 662 static struct xformsw ipe4_xformsw = { 663 XF_IP4, 0, "IPv4 Simple Encapsulation", 664 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 665 }; 666 667 extern struct domain inetdomain; 668 #endif /* INET || INET6 */ 669 #ifdef INET 670 static struct protosw ipe4_protosw = { 671 .pr_type = SOCK_RAW, 672 .pr_domain = &inetdomain, 673 .pr_protocol = IPPROTO_IPV4, 674 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 675 .pr_input = ip4_input, 676 .pr_ctloutput = rip_ctloutput, 677 .pr_usrreqs = &rip_usrreqs 678 }; 679 #endif /* INET */ 680 #if defined(INET6) && defined(INET) 681 static struct ip6protosw ipe6_protosw = { 682 .pr_type = SOCK_RAW, 683 .pr_domain = &inetdomain, 684 .pr_protocol = IPPROTO_IPV6, 685 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 686 .pr_input = ip4_input6, 687 .pr_ctloutput = rip_ctloutput, 688 .pr_usrreqs = &rip_usrreqs 689 }; 690 #endif /* INET6 && INET */ 691 692 #if defined(INET) 693 /* 694 * Check the encapsulated packet to see if we want it 695 */ 696 static int 697 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 698 { 699 /* 700 * Only take packets coming from IPSEC tunnels; the rest 701 * must be handled by the gif tunnel code. Note that we 702 * also return a minimum priority when we want the packet 703 * so any explicit gif tunnels take precedence. 704 */ 705 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 706 } 707 #endif /* INET */ 708 709 static void 710 ipe4_attach(void) 711 { 712 713 xform_register(&ipe4_xformsw); 714 /* attach to encapsulation framework */ 715 /* XXX save return cookie for detach on module remove */ 716 #ifdef INET 717 (void) encap_attach_func(AF_INET, -1, 718 ipe4_encapcheck, &ipe4_protosw, NULL); 719 #endif 720 #if defined(INET6) && defined(INET) 721 (void) encap_attach_func(AF_INET6, -1, 722 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL); 723 #endif 724 } 725 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 726 #endif /* IPSEC */
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