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 /* $FreeBSD$ */ 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_random_ip_id.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/route.h> 56 #include <net/netisr.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_var.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip_ecn.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/ip_encap.h> 65 #include <netinet/ipprotosw.h> 66 67 #include <netipsec/ipsec.h> 68 #include <netipsec/xform.h> 69 70 #include <netipsec/ipip_var.h> 71 72 #ifdef MROUTING 73 #include <netinet/ip_mroute.h> 74 #endif 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 typedef void pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */ 90 91 /* 92 * We can control the acceptance of IP4 packets by altering the sysctl 93 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance. 94 */ 95 int ipip_allow = 0; 96 struct ipipstat ipipstat; 97 98 SYSCTL_DECL(_net_inet_ipip); 99 SYSCTL_INT(_net_inet_ipip, OID_AUTO, 100 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, ""); 101 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 102 stats, CTLFLAG_RD, &ipipstat, ipipstat, ""); 103 104 /* XXX IPCOMP */ 105 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 106 107 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 108 109 #ifdef INET6 110 /* 111 * Really only a wrapper for ipip_input(), for use with IPv6. 112 */ 113 int 114 ip4_input6(struct mbuf **m, int *offp, int proto) 115 { 116 #if 0 117 /* If we do not accept IP-in-IP explicitly, drop. */ 118 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 119 DPRINTF(("ip4_input6: dropped due to policy\n")); 120 ipipstat.ipips_pdrops++; 121 m_freem(*m); 122 return IPPROTO_DONE; 123 } 124 #endif 125 _ipip_input(*m, *offp, NULL); 126 return IPPROTO_DONE; 127 } 128 #endif /* INET6 */ 129 130 #ifdef INET 131 /* 132 * Really only a wrapper for ipip_input(), for use with IPv4. 133 */ 134 void 135 ip4_input(struct mbuf *m, ...) 136 { 137 va_list ap; 138 int iphlen; 139 140 #if 0 141 /* If we do not accept IP-in-IP explicitly, drop. */ 142 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { 143 DPRINTF(("ip4_input: dropped due to policy\n")); 144 ipipstat.ipips_pdrops++; 145 m_freem(m); 146 return; 147 } 148 #endif 149 va_start(ap, m); 150 iphlen = va_arg(ap, int); 151 va_end(ap); 152 153 _ipip_input(m, iphlen, NULL); 154 } 155 #endif /* INET */ 156 157 /* 158 * ipip_input gets called when we receive an IP{46} encapsulated packet, 159 * either because we got it at a real interface, or because AH or ESP 160 * were being used in tunnel mode (in which case the rcvif element will 161 * contain the address of the encX interface associated with the tunnel. 162 */ 163 164 static void 165 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 166 { 167 register struct sockaddr_in *sin; 168 register struct ifnet *ifp; 169 register struct ifaddr *ifa; 170 struct ifqueue *ifq = NULL; 171 struct ip *ipo; 172 #ifdef INET6 173 register struct sockaddr_in6 *sin6; 174 struct ip6_hdr *ip6 = NULL; 175 u_int8_t itos; 176 #endif 177 u_int8_t nxt; 178 int isr; 179 u_int8_t otos; 180 u_int8_t v; 181 int hlen; 182 183 ipipstat.ipips_ipackets++; 184 185 m_copydata(m, 0, 1, &v); 186 187 switch (v >> 4) { 188 #ifdef INET 189 case 4: 190 hlen = sizeof(struct ip); 191 break; 192 #endif /* INET */ 193 #ifdef INET6 194 case 6: 195 hlen = sizeof(struct ip6_hdr); 196 break; 197 #endif 198 default: 199 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 200 "for outer header\n", v, v>>4)); 201 ipipstat.ipips_family++; 202 m_freem(m); 203 return /* EAFNOSUPPORT */; 204 } 205 206 /* Bring the IP header in the first mbuf, if not there already */ 207 if (m->m_len < hlen) { 208 if ((m = m_pullup(m, hlen)) == NULL) { 209 DPRINTF(("ipip_input: m_pullup (1) failed\n")); 210 ipipstat.ipips_hdrops++; 211 return; 212 } 213 } 214 215 ipo = mtod(m, struct ip *); 216 217 #ifdef MROUTING 218 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 219 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 220 ipip_mroute_input (m, iphlen); 221 return; 222 } 223 } 224 #endif /* MROUTING */ 225 226 /* Keep outer ecn field. */ 227 switch (v >> 4) { 228 #ifdef INET 229 case 4: 230 otos = ipo->ip_tos; 231 break; 232 #endif /* INET */ 233 #ifdef INET6 234 case 6: 235 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 236 break; 237 #endif 238 default: 239 panic("ipip_input: unknown ip version %u (outer)", v>>4); 240 } 241 242 /* Remove outer IP header */ 243 m_adj(m, iphlen); 244 245 /* Sanity check */ 246 if (m->m_pkthdr.len < sizeof(struct ip)) { 247 ipipstat.ipips_hdrops++; 248 m_freem(m); 249 return; 250 } 251 252 m_copydata(m, 0, 1, &v); 253 254 switch (v >> 4) { 255 #ifdef INET 256 case 4: 257 hlen = sizeof(struct ip); 258 break; 259 #endif /* INET */ 260 261 #ifdef INET6 262 case 6: 263 hlen = sizeof(struct ip6_hdr); 264 break; 265 #endif 266 default: 267 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 268 "for inner header\n", v, v>>4)); 269 ipipstat.ipips_family++; 270 m_freem(m); 271 return; /* EAFNOSUPPORT */ 272 } 273 274 /* 275 * Bring the inner IP header in the first mbuf, if not there already. 276 */ 277 if (m->m_len < hlen) { 278 if ((m = m_pullup(m, hlen)) == NULL) { 279 DPRINTF(("ipip_input: m_pullup (2) failed\n")); 280 ipipstat.ipips_hdrops++; 281 return; 282 } 283 } 284 285 /* 286 * RFC 1853 specifies that the inner TTL should not be touched on 287 * decapsulation. There's no reason this comment should be here, but 288 * this is as good as any a position. 289 */ 290 291 /* Some sanity checks in the inner IP header */ 292 switch (v >> 4) { 293 #ifdef INET 294 case 4: 295 ipo = mtod(m, struct ip *); 296 nxt = ipo->ip_p; 297 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 298 break; 299 #endif /* INET */ 300 #ifdef INET6 301 case 6: 302 ip6 = (struct ip6_hdr *) ipo; 303 nxt = ip6->ip6_nxt; 304 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 305 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 306 ip6->ip6_flow &= ~htonl(0xff << 20); 307 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 308 break; 309 #endif 310 default: 311 panic("ipip_input: unknown ip version %u (inner)", v>>4); 312 } 313 314 /* Check for local address spoofing. */ 315 if ((m->m_pkthdr.rcvif == NULL || 316 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 317 ipip_allow != 2) { 318 for (ifp = ifnet.tqh_first; ifp != 0; 319 ifp = ifp->if_list.tqe_next) { 320 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; 321 ifa = ifa->ifa_list.tqe_next) { 322 #ifdef INET 323 if (ipo) { 324 if (ifa->ifa_addr->sa_family != 325 AF_INET) 326 continue; 327 328 sin = (struct sockaddr_in *) ifa->ifa_addr; 329 330 if (sin->sin_addr.s_addr == 331 ipo->ip_src.s_addr) { 332 ipipstat.ipips_spoof++; 333 m_freem(m); 334 return; 335 } 336 } 337 #endif /* INET */ 338 339 #ifdef INET6 340 if (ip6) { 341 if (ifa->ifa_addr->sa_family != 342 AF_INET6) 343 continue; 344 345 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 346 347 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 348 ipipstat.ipips_spoof++; 349 m_freem(m); 350 return; 351 } 352 353 } 354 #endif /* INET6 */ 355 } 356 } 357 } 358 359 /* Statistics */ 360 ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen; 361 362 /* 363 * Interface pointer stays the same; if no IPsec processing has 364 * been done (or will be done), this will point to a normal 365 * interface. Otherwise, it'll point to an enc interface, which 366 * will allow a packet filter to distinguish between secure and 367 * untrusted packets. 368 */ 369 370 switch (v >> 4) { 371 #ifdef INET 372 case 4: 373 ifq = &ipintrq; 374 isr = NETISR_IP; 375 break; 376 #endif 377 #ifdef INET6 378 case 6: 379 ifq = &ip6intrq; 380 isr = NETISR_IPV6; 381 break; 382 #endif 383 default: 384 panic("ipip_input: should never reach here"); 385 } 386 387 if (!IF_HANDOFF(ifq, m, NULL)) { 388 ipipstat.ipips_qfull++; 389 390 DPRINTF(("ipip_input: packet dropped because of full queue\n")); 391 } else { 392 schednetisr(isr); 393 } 394 } 395 396 int 397 ipip_output( 398 struct mbuf *m, 399 struct ipsecrequest *isr, 400 struct mbuf **mp, 401 int skip, 402 int protoff 403 ) 404 { 405 struct secasvar *sav; 406 u_int8_t tp, otos; 407 struct secasindex *saidx; 408 int error; 409 #ifdef INET 410 u_int8_t itos; 411 struct ip *ipo; 412 #endif /* INET */ 413 #ifdef INET6 414 struct ip6_hdr *ip6, *ip6o; 415 #endif /* INET6 */ 416 417 SPLASSERT(net, "ipip_output"); 418 419 sav = isr->sav; 420 KASSERT(sav != NULL, ("ipip_output: null SA")); 421 KASSERT(sav->sah != NULL, ("ipip_output: null SAH")); 422 423 /* XXX Deal with empty TDB source/destination addresses. */ 424 425 m_copydata(m, 0, 1, &tp); 426 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 427 428 saidx = &sav->sah->saidx; 429 switch (saidx->dst.sa.sa_family) { 430 #ifdef INET 431 case AF_INET: 432 if (saidx->src.sa.sa_family != AF_INET || 433 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 434 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 435 DPRINTF(("ipip_output: unspecified tunnel endpoint " 436 "address in SA %s/%08lx\n", 437 ipsec_address(&saidx->dst), 438 (u_long) ntohl(sav->spi))); 439 ipipstat.ipips_unspec++; 440 error = EINVAL; 441 goto bad; 442 } 443 444 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 445 if (m == 0) { 446 DPRINTF(("ipip_output: M_PREPEND failed\n")); 447 ipipstat.ipips_hdrops++; 448 error = ENOBUFS; 449 goto bad; 450 } 451 452 ipo = mtod(m, struct ip *); 453 454 ipo->ip_v = IPVERSION; 455 ipo->ip_hl = 5; 456 ipo->ip_len = htons(m->m_pkthdr.len); 457 ipo->ip_ttl = ip_defttl; 458 ipo->ip_sum = 0; 459 ipo->ip_src = saidx->src.sin.sin_addr; 460 ipo->ip_dst = saidx->dst.sin.sin_addr; 461 462 #ifdef RANDOM_IP_ID 463 ipo->ip_id = ip_randomid(); 464 #else 465 ipo->ip_id = htons(ip_id++); 466 #endif 467 468 /* If the inner protocol is IP... */ 469 if (tp == IPVERSION) { 470 /* Save ECN notification */ 471 m_copydata(m, sizeof(struct ip) + 472 offsetof(struct ip, ip_tos), 473 sizeof(u_int8_t), (caddr_t) &itos); 474 475 ipo->ip_p = IPPROTO_IPIP; 476 477 /* 478 * We should be keeping tunnel soft-state and 479 * send back ICMPs if needed. 480 */ 481 m_copydata(m, sizeof(struct ip) + 482 offsetof(struct ip, ip_off), 483 sizeof(u_int16_t), (caddr_t) &ipo->ip_off); 484 ipo->ip_off = ntohs(ipo->ip_off); 485 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK); 486 ipo->ip_off = htons(ipo->ip_off); 487 } 488 #ifdef INET6 489 else if (tp == (IPV6_VERSION >> 4)) { 490 u_int32_t itos32; 491 492 /* Save ECN notification. */ 493 m_copydata(m, sizeof(struct ip) + 494 offsetof(struct ip6_hdr, ip6_flow), 495 sizeof(u_int32_t), (caddr_t) &itos32); 496 itos = ntohl(itos32) >> 20; 497 ipo->ip_p = IPPROTO_IPV6; 498 ipo->ip_off = 0; 499 } 500 #endif /* INET6 */ 501 else { 502 goto nofamily; 503 } 504 505 otos = 0; 506 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 507 ipo->ip_tos = otos; 508 break; 509 #endif /* INET */ 510 511 #ifdef INET6 512 case AF_INET6: 513 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 514 saidx->src.sa.sa_family != AF_INET6 || 515 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 516 DPRINTF(("ipip_output: unspecified tunnel endpoint " 517 "address in SA %s/%08lx\n", 518 ipsec_address(&saidx->dst), 519 (u_long) ntohl(sav->spi))); 520 ipipstat.ipips_unspec++; 521 error = ENOBUFS; 522 goto bad; 523 } 524 525 /* scoped address handling */ 526 ip6 = mtod(m, struct ip6_hdr *); 527 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 528 ip6->ip6_src.s6_addr16[1] = 0; 529 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 530 ip6->ip6_dst.s6_addr16[1] = 0; 531 532 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 533 if (m == 0) { 534 DPRINTF(("ipip_output: M_PREPEND failed\n")); 535 ipipstat.ipips_hdrops++; 536 *mp = NULL; 537 error = ENOBUFS; 538 goto bad; 539 } 540 541 /* Initialize IPv6 header */ 542 ip6o = mtod(m, struct ip6_hdr *); 543 ip6o->ip6_flow = 0; 544 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 545 ip6o->ip6_vfc |= IPV6_VERSION; 546 ip6o->ip6_plen = htons(m->m_pkthdr.len); 547 ip6o->ip6_hlim = ip_defttl; 548 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 549 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 550 551 #ifdef INET 552 if (tp == IPVERSION) { 553 /* Save ECN notification */ 554 m_copydata(m, sizeof(struct ip6_hdr) + 555 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 556 (caddr_t) &itos); 557 558 /* This is really IPVERSION. */ 559 ip6o->ip6_nxt = IPPROTO_IPIP; 560 } else 561 #endif /* INET */ 562 if (tp == (IPV6_VERSION >> 4)) { 563 u_int32_t itos32; 564 565 /* Save ECN notification. */ 566 m_copydata(m, sizeof(struct ip6_hdr) + 567 offsetof(struct ip6_hdr, ip6_flow), 568 sizeof(u_int32_t), (caddr_t) &itos32); 569 itos = ntohl(itos32) >> 20; 570 571 ip6o->ip6_nxt = IPPROTO_IPV6; 572 } else { 573 goto nofamily; 574 } 575 576 otos = 0; 577 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 578 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 579 break; 580 #endif /* INET6 */ 581 582 default: 583 nofamily: 584 DPRINTF(("ipip_output: unsupported protocol family %u\n", 585 saidx->dst.sa.sa_family)); 586 ipipstat.ipips_family++; 587 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 588 goto bad; 589 } 590 591 ipipstat.ipips_opackets++; 592 *mp = m; 593 594 #ifdef INET 595 if (saidx->dst.sa.sa_family == AF_INET) { 596 #if 0 597 if (sav->tdb_xform->xf_type == XF_IP4) 598 tdb->tdb_cur_bytes += 599 m->m_pkthdr.len - sizeof(struct ip); 600 #endif 601 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip); 602 } 603 #endif /* INET */ 604 605 #ifdef INET6 606 if (saidx->dst.sa.sa_family == AF_INET6) { 607 #if 0 608 if (sav->tdb_xform->xf_type == XF_IP4) 609 tdb->tdb_cur_bytes += 610 m->m_pkthdr.len - sizeof(struct ip6_hdr); 611 #endif 612 ipipstat.ipips_obytes += 613 m->m_pkthdr.len - sizeof(struct ip6_hdr); 614 } 615 #endif /* INET6 */ 616 617 return 0; 618 bad: 619 if (m) 620 m_freem(m), *mp = NULL; 621 return (error); 622 } 623 624 #ifdef FAST_IPSEC 625 static int 626 ipe4_init(struct secasvar *sav, struct xformsw *xsp) 627 { 628 sav->tdb_xform = xsp; 629 return 0; 630 } 631 632 static int 633 ipe4_zeroize(struct secasvar *sav) 634 { 635 sav->tdb_xform = NULL; 636 return 0; 637 } 638 639 static int 640 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 641 { 642 /* This is a rather serious mistake, so no conditional printing. */ 643 printf("ipe4_input: should never be called\n"); 644 if (m) 645 m_freem(m); 646 return EOPNOTSUPP; 647 } 648 649 static struct xformsw ipe4_xformsw = { 650 XF_IP4, 0, "IPv4 Simple Encapsulation", 651 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 652 }; 653 654 extern struct domain inetdomain; 655 static struct ipprotosw ipe4_protosw[] = { 656 { SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR|PR_LASTHDR, 657 (pr_in_input_t*) ip4_input, 658 0, 0, rip_ctloutput, 659 0, 660 0, 0, 0, 0, 661 &rip_usrreqs 662 }, 663 #ifdef INET6 664 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR, 665 (pr_in_input_t*) ip4_input, 666 0, 0, rip_ctloutput, 667 0, 668 0, 0, 0, 0, 669 &rip_usrreqs 670 } 671 #endif 672 }; 673 674 /* 675 * Check the encapsulated packet to see if we want it 676 */ 677 static int 678 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 679 { 680 /* 681 * Only take packets coming from IPSEC tunnels; the rest 682 * must be handled by the gif tunnel code. Note that we 683 * also return a minimum priority when we want the packet 684 * so any explicit gif tunnels take precedence. 685 */ 686 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 687 } 688 689 static void 690 ipe4_attach(void) 691 { 692 xform_register(&ipe4_xformsw); 693 /* attach to encapsulation framework */ 694 /* XXX save return cookie for detach on module remove */ 695 (void) encap_attach_func(AF_INET, -1, 696 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL); 697 #ifdef INET6 698 (void) encap_attach_func(AF_INET6, -1, 699 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL); 700 #endif 701 } 702 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 703 #endif /* FAST_IPSEC */
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