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/10.0/sys/netipsec/xform_ipip.c 253088 2013-07-09 10:08:13Z 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_PCPUSTAT_DEFINE(struct ipipstat, ipipstat); 95 VNET_PCPUSTAT_SYSINIT(ipipstat); 96 97 #ifdef VIMAGE 98 VNET_PCPUSTAT_SYSUNINIT(ipipstat); 99 #endif /* VIMAGE */ 100 101 SYSCTL_DECL(_net_inet_ipip); 102 SYSCTL_VNET_INT(_net_inet_ipip, OID_AUTO, 103 ipip_allow, CTLFLAG_RW, &VNET_NAME(ipip_allow), 0, ""); 104 SYSCTL_VNET_PCPUSTAT(_net_inet_ipip, IPSECCTL_STATS, stats, 105 struct ipipstat, ipipstat, 106 "IPIP statistics (struct ipipstat, netipsec/ipip_var.h)"); 107 108 /* XXX IPCOMP */ 109 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 110 111 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 112 113 #ifdef INET6 114 /* 115 * Really only a wrapper for ipip_input(), for use with IPv6. 116 */ 117 int 118 ip4_input6(struct mbuf **m, int *offp, int proto) 119 { 120 #if 0 121 /* If we do not accept IP-in-IP explicitly, drop. */ 122 if (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 123 DPRINTF(("%s: dropped due to policy\n", __func__)); 124 IPIPSTAT_INC(ipips_pdrops); 125 m_freem(*m); 126 return IPPROTO_DONE; 127 } 128 #endif 129 _ipip_input(*m, *offp, NULL); 130 return IPPROTO_DONE; 131 } 132 #endif /* INET6 */ 133 134 #ifdef INET 135 /* 136 * Really only a wrapper for ipip_input(), for use with IPv4. 137 */ 138 void 139 ip4_input(struct mbuf *m, int off) 140 { 141 #if 0 142 /* If we do not accept IP-in-IP explicitly, drop. */ 143 if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) { 144 DPRINTF(("%s: dropped due to policy\n", __func__)); 145 IPIPSTAT_INC(ipips_pdrops); 146 m_freem(m); 147 return; 148 } 149 #endif 150 _ipip_input(m, off, NULL); 151 } 152 #endif /* INET */ 153 154 /* 155 * ipip_input gets called when we receive an IP{46} encapsulated packet, 156 * either because we got it at a real interface, or because AH or ESP 157 * were being used in tunnel mode (in which case the rcvif element will 158 * contain the address of the encX interface associated with the tunnel. 159 */ 160 161 static void 162 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 163 { 164 #ifdef INET 165 register struct sockaddr_in *sin; 166 #endif 167 register struct ifnet *ifp; 168 register struct ifaddr *ifa; 169 struct ip *ipo; 170 #ifdef INET6 171 register struct sockaddr_in6 *sin6; 172 struct ip6_hdr *ip6 = NULL; 173 u_int8_t itos; 174 #endif 175 u_int8_t nxt; 176 int isr; 177 u_int8_t otos; 178 u_int8_t v; 179 int hlen; 180 181 IPIPSTAT_INC(ipips_ipackets); 182 183 m_copydata(m, 0, 1, &v); 184 185 switch (v >> 4) { 186 #ifdef INET 187 case 4: 188 hlen = sizeof(struct ip); 189 break; 190 #endif /* INET */ 191 #ifdef INET6 192 case 6: 193 hlen = sizeof(struct ip6_hdr); 194 break; 195 #endif 196 default: 197 IPIPSTAT_INC(ipips_family); 198 m_freem(m); 199 return /* EAFNOSUPPORT */; 200 } 201 202 /* Bring the IP header in the first mbuf, if not there already */ 203 if (m->m_len < hlen) { 204 if ((m = m_pullup(m, hlen)) == NULL) { 205 DPRINTF(("%s: m_pullup (1) failed\n", __func__)); 206 IPIPSTAT_INC(ipips_hdrops); 207 return; 208 } 209 } 210 211 ipo = mtod(m, struct ip *); 212 213 #ifdef MROUTING 214 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 215 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 216 ipip_mroute_input (m, iphlen); 217 return; 218 } 219 } 220 #endif /* MROUTING */ 221 222 /* Keep outer ecn field. */ 223 switch (v >> 4) { 224 #ifdef INET 225 case 4: 226 otos = ipo->ip_tos; 227 break; 228 #endif /* INET */ 229 #ifdef INET6 230 case 6: 231 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 232 break; 233 #endif 234 default: 235 panic("ipip_input: unknown ip version %u (outer)", v>>4); 236 } 237 238 /* Remove outer IP header */ 239 m_adj(m, iphlen); 240 241 /* Sanity check */ 242 if (m->m_pkthdr.len < sizeof(struct ip)) { 243 IPIPSTAT_INC(ipips_hdrops); 244 m_freem(m); 245 return; 246 } 247 248 m_copydata(m, 0, 1, &v); 249 250 switch (v >> 4) { 251 #ifdef INET 252 case 4: 253 hlen = sizeof(struct ip); 254 break; 255 #endif /* INET */ 256 257 #ifdef INET6 258 case 6: 259 hlen = sizeof(struct ip6_hdr); 260 break; 261 #endif 262 default: 263 IPIPSTAT_INC(ipips_family); 264 m_freem(m); 265 return; /* EAFNOSUPPORT */ 266 } 267 268 /* 269 * Bring the inner IP header in the first mbuf, if not there already. 270 */ 271 if (m->m_len < hlen) { 272 if ((m = m_pullup(m, hlen)) == NULL) { 273 DPRINTF(("%s: m_pullup (2) failed\n", __func__)); 274 IPIPSTAT_INC(ipips_hdrops); 275 return; 276 } 277 } 278 279 /* 280 * RFC 1853 specifies that the inner TTL should not be touched on 281 * decapsulation. There's no reason this comment should be here, but 282 * this is as good as any a position. 283 */ 284 285 /* Some sanity checks in the inner IP header */ 286 switch (v >> 4) { 287 #ifdef INET 288 case 4: 289 ipo = mtod(m, struct ip *); 290 nxt = ipo->ip_p; 291 ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos); 292 break; 293 #endif /* INET */ 294 #ifdef INET6 295 case 6: 296 ip6 = (struct ip6_hdr *) ipo; 297 nxt = ip6->ip6_nxt; 298 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 299 ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos); 300 ip6->ip6_flow &= ~htonl(0xff << 20); 301 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 302 break; 303 #endif 304 default: 305 panic("ipip_input: unknown ip version %u (inner)", v>>4); 306 } 307 308 /* Check for local address spoofing. */ 309 if ((m->m_pkthdr.rcvif == NULL || 310 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 311 V_ipip_allow != 2) { 312 IFNET_RLOCK_NOSLEEP(); 313 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 314 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 315 #ifdef INET 316 if (ipo) { 317 if (ifa->ifa_addr->sa_family != 318 AF_INET) 319 continue; 320 321 sin = (struct sockaddr_in *) ifa->ifa_addr; 322 323 if (sin->sin_addr.s_addr == 324 ipo->ip_src.s_addr) { 325 IPIPSTAT_INC(ipips_spoof); 326 m_freem(m); 327 IFNET_RUNLOCK_NOSLEEP(); 328 return; 329 } 330 } 331 #endif /* INET */ 332 333 #ifdef INET6 334 if (ip6) { 335 if (ifa->ifa_addr->sa_family != 336 AF_INET6) 337 continue; 338 339 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 340 341 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 342 IPIPSTAT_INC(ipips_spoof); 343 m_freem(m); 344 IFNET_RUNLOCK_NOSLEEP(); 345 return; 346 } 347 348 } 349 #endif /* INET6 */ 350 } 351 } 352 IFNET_RUNLOCK_NOSLEEP(); 353 } 354 355 /* Statistics */ 356 IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen); 357 358 #ifdef DEV_ENC 359 switch (v >> 4) { 360 #ifdef INET 361 case 4: 362 ipsec_bpf(m, NULL, AF_INET, ENC_IN|ENC_AFTER); 363 break; 364 #endif 365 #ifdef INET6 366 case 6: 367 ipsec_bpf(m, NULL, AF_INET6, ENC_IN|ENC_AFTER); 368 break; 369 #endif 370 default: 371 panic("%s: bogus ip version %u", __func__, v>>4); 372 } 373 /* pass the mbuf to enc0 for packet filtering */ 374 if (ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER) != 0) 375 return; 376 #endif 377 378 /* 379 * Interface pointer stays the same; if no IPsec processing has 380 * been done (or will be done), this will point to a normal 381 * interface. Otherwise, it'll point to an enc interface, which 382 * will allow a packet filter to distinguish between secure and 383 * untrusted packets. 384 */ 385 386 switch (v >> 4) { 387 #ifdef INET 388 case 4: 389 isr = NETISR_IP; 390 break; 391 #endif 392 #ifdef INET6 393 case 6: 394 isr = NETISR_IPV6; 395 break; 396 #endif 397 default: 398 panic("%s: bogus ip version %u", __func__, v>>4); 399 } 400 401 if (netisr_queue(isr, m)) { /* (0) on success. */ 402 IPIPSTAT_INC(ipips_qfull); 403 DPRINTF(("%s: packet dropped because of full queue\n", 404 __func__)); 405 } 406 } 407 408 int 409 ipip_output( 410 struct mbuf *m, 411 struct ipsecrequest *isr, 412 struct mbuf **mp, 413 int skip, 414 int protoff 415 ) 416 { 417 struct secasvar *sav; 418 u_int8_t tp, otos; 419 struct secasindex *saidx; 420 int error; 421 #if defined(INET) || defined(INET6) 422 u_int8_t itos; 423 #endif 424 #ifdef INET 425 struct ip *ipo; 426 #endif /* INET */ 427 #ifdef INET6 428 struct ip6_hdr *ip6, *ip6o; 429 #endif /* INET6 */ 430 431 sav = isr->sav; 432 IPSEC_ASSERT(sav != NULL, ("null SA")); 433 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 434 435 /* XXX Deal with empty TDB source/destination addresses. */ 436 437 m_copydata(m, 0, 1, &tp); 438 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 439 440 saidx = &sav->sah->saidx; 441 switch (saidx->dst.sa.sa_family) { 442 #ifdef INET 443 case AF_INET: 444 if (saidx->src.sa.sa_family != AF_INET || 445 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 446 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 447 DPRINTF(("%s: unspecified tunnel endpoint " 448 "address in SA %s/%08lx\n", __func__, 449 ipsec_address(&saidx->dst), 450 (u_long) ntohl(sav->spi))); 451 IPIPSTAT_INC(ipips_unspec); 452 error = EINVAL; 453 goto bad; 454 } 455 456 M_PREPEND(m, sizeof(struct ip), M_NOWAIT); 457 if (m == 0) { 458 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 459 IPIPSTAT_INC(ipips_hdrops); 460 error = ENOBUFS; 461 goto bad; 462 } 463 464 ipo = mtod(m, struct ip *); 465 466 ipo->ip_v = IPVERSION; 467 ipo->ip_hl = 5; 468 ipo->ip_len = htons(m->m_pkthdr.len); 469 ipo->ip_ttl = V_ip_defttl; 470 ipo->ip_sum = 0; 471 ipo->ip_src = saidx->src.sin.sin_addr; 472 ipo->ip_dst = saidx->dst.sin.sin_addr; 473 474 ipo->ip_id = ip_newid(); 475 476 /* If the inner protocol is IP... */ 477 switch (tp) { 478 case IPVERSION: 479 /* Save ECN notification */ 480 m_copydata(m, sizeof(struct ip) + 481 offsetof(struct ip, ip_tos), 482 sizeof(u_int8_t), (caddr_t) &itos); 483 484 ipo->ip_p = IPPROTO_IPIP; 485 486 /* 487 * We should be keeping tunnel soft-state and 488 * send back ICMPs if needed. 489 */ 490 m_copydata(m, sizeof(struct ip) + 491 offsetof(struct ip, ip_off), 492 sizeof(u_int16_t), (caddr_t) &ipo->ip_off); 493 ipo->ip_off = ntohs(ipo->ip_off); 494 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK); 495 ipo->ip_off = htons(ipo->ip_off); 496 break; 497 #ifdef INET6 498 case (IPV6_VERSION >> 4): 499 { 500 u_int32_t itos32; 501 502 /* Save ECN notification. */ 503 m_copydata(m, sizeof(struct ip) + 504 offsetof(struct ip6_hdr, ip6_flow), 505 sizeof(u_int32_t), (caddr_t) &itos32); 506 itos = ntohl(itos32) >> 20; 507 ipo->ip_p = IPPROTO_IPV6; 508 ipo->ip_off = 0; 509 break; 510 } 511 #endif /* INET6 */ 512 default: 513 goto nofamily; 514 } 515 516 otos = 0; 517 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 518 ipo->ip_tos = otos; 519 break; 520 #endif /* INET */ 521 522 #ifdef INET6 523 case AF_INET6: 524 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 525 saidx->src.sa.sa_family != AF_INET6 || 526 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 527 DPRINTF(("%s: unspecified tunnel endpoint " 528 "address in SA %s/%08lx\n", __func__, 529 ipsec_address(&saidx->dst), 530 (u_long) ntohl(sav->spi))); 531 IPIPSTAT_INC(ipips_unspec); 532 error = ENOBUFS; 533 goto bad; 534 } 535 536 /* scoped address handling */ 537 ip6 = mtod(m, struct ip6_hdr *); 538 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 539 ip6->ip6_src.s6_addr16[1] = 0; 540 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 541 ip6->ip6_dst.s6_addr16[1] = 0; 542 543 M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT); 544 if (m == 0) { 545 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 546 IPIPSTAT_INC(ipips_hdrops); 547 error = ENOBUFS; 548 goto bad; 549 } 550 551 /* Initialize IPv6 header */ 552 ip6o = mtod(m, struct ip6_hdr *); 553 ip6o->ip6_flow = 0; 554 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 555 ip6o->ip6_vfc |= IPV6_VERSION; 556 ip6o->ip6_plen = htons(m->m_pkthdr.len); 557 ip6o->ip6_hlim = V_ip_defttl; 558 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 559 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 560 561 switch (tp) { 562 #ifdef INET 563 case IPVERSION: 564 /* Save ECN notification */ 565 m_copydata(m, sizeof(struct ip6_hdr) + 566 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 567 (caddr_t) &itos); 568 569 /* This is really IPVERSION. */ 570 ip6o->ip6_nxt = IPPROTO_IPIP; 571 break; 572 #endif /* INET */ 573 case (IPV6_VERSION >> 4): 574 { 575 u_int32_t itos32; 576 577 /* Save ECN notification. */ 578 m_copydata(m, sizeof(struct ip6_hdr) + 579 offsetof(struct ip6_hdr, ip6_flow), 580 sizeof(u_int32_t), (caddr_t) &itos32); 581 itos = ntohl(itos32) >> 20; 582 583 ip6o->ip6_nxt = IPPROTO_IPV6; 584 break; 585 } 586 default: 587 goto nofamily; 588 } 589 590 otos = 0; 591 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 592 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 593 break; 594 #endif /* INET6 */ 595 596 default: 597 nofamily: 598 DPRINTF(("%s: unsupported protocol family %u\n", __func__, 599 saidx->dst.sa.sa_family)); 600 IPIPSTAT_INC(ipips_family); 601 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 602 goto bad; 603 } 604 605 IPIPSTAT_INC(ipips_opackets); 606 *mp = m; 607 608 #ifdef INET 609 if (saidx->dst.sa.sa_family == AF_INET) { 610 #if 0 611 if (sav->tdb_xform->xf_type == XF_IP4) 612 tdb->tdb_cur_bytes += 613 m->m_pkthdr.len - sizeof(struct ip); 614 #endif 615 IPIPSTAT_ADD(ipips_obytes, 616 m->m_pkthdr.len - sizeof(struct ip)); 617 } 618 #endif /* INET */ 619 620 #ifdef INET6 621 if (saidx->dst.sa.sa_family == AF_INET6) { 622 #if 0 623 if (sav->tdb_xform->xf_type == XF_IP4) 624 tdb->tdb_cur_bytes += 625 m->m_pkthdr.len - sizeof(struct ip6_hdr); 626 #endif 627 IPIPSTAT_ADD(ipips_obytes, 628 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 629 } 630 #endif /* INET6 */ 631 632 return 0; 633 bad: 634 if (m) 635 m_freem(m); 636 *mp = NULL; 637 return (error); 638 } 639 640 #ifdef IPSEC 641 #if defined(INET) || defined(INET6) 642 static int 643 ipe4_init(struct secasvar *sav, struct xformsw *xsp) 644 { 645 sav->tdb_xform = xsp; 646 return 0; 647 } 648 649 static int 650 ipe4_zeroize(struct secasvar *sav) 651 { 652 sav->tdb_xform = NULL; 653 return 0; 654 } 655 656 static int 657 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 658 { 659 /* This is a rather serious mistake, so no conditional printing. */ 660 printf("%s: should never be called\n", __func__); 661 if (m) 662 m_freem(m); 663 return EOPNOTSUPP; 664 } 665 666 static struct xformsw ipe4_xformsw = { 667 XF_IP4, 0, "IPv4 Simple Encapsulation", 668 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 669 }; 670 671 extern struct domain inetdomain; 672 #endif /* INET || INET6 */ 673 #ifdef INET 674 static struct protosw ipe4_protosw = { 675 .pr_type = SOCK_RAW, 676 .pr_domain = &inetdomain, 677 .pr_protocol = IPPROTO_IPV4, 678 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 679 .pr_input = ip4_input, 680 .pr_ctloutput = rip_ctloutput, 681 .pr_usrreqs = &rip_usrreqs 682 }; 683 #endif /* INET */ 684 #if defined(INET6) && defined(INET) 685 static struct ip6protosw ipe6_protosw = { 686 .pr_type = SOCK_RAW, 687 .pr_domain = &inetdomain, 688 .pr_protocol = IPPROTO_IPV6, 689 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 690 .pr_input = ip4_input6, 691 .pr_ctloutput = rip_ctloutput, 692 .pr_usrreqs = &rip_usrreqs 693 }; 694 #endif /* INET6 && INET */ 695 696 #ifdef INET 697 /* 698 * Check the encapsulated packet to see if we want it 699 */ 700 static int 701 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 702 { 703 /* 704 * Only take packets coming from IPSEC tunnels; the rest 705 * must be handled by the gif tunnel code. Note that we 706 * also return a minimum priority when we want the packet 707 * so any explicit gif tunnels take precedence. 708 */ 709 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 710 } 711 #endif /* INET */ 712 713 static void 714 ipe4_attach(void) 715 { 716 717 xform_register(&ipe4_xformsw); 718 /* attach to encapsulation framework */ 719 /* XXX save return cookie for detach on module remove */ 720 #ifdef INET 721 (void) encap_attach_func(AF_INET, -1, 722 ipe4_encapcheck, &ipe4_protosw, NULL); 723 #endif 724 #if defined(INET6) && defined(INET) 725 (void) encap_attach_func(AF_INET6, -1, 726 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL); 727 #endif 728 } 729 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 730 #endif /* IPSEC */
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