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/5.1/sys/netipsec/xform_ipip.c 111888 2003-03-04 23:19:55Z jlemon $ */ 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 /* 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 int ipip_allow = 0; 94 struct ipipstat ipipstat; 95 96 SYSCTL_DECL(_net_inet_ipip); 97 SYSCTL_INT(_net_inet_ipip, OID_AUTO, 98 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, ""); 99 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 100 stats, CTLFLAG_RD, &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 (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 117 DPRINTF(("ip4_input6: dropped due to policy\n")); 118 ipipstat.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, ...) 134 { 135 va_list ap; 136 int iphlen; 137 138 #if 0 139 /* If we do not accept IP-in-IP explicitly, drop. */ 140 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { 141 DPRINTF(("ip4_input: dropped due to policy\n")); 142 ipipstat.ipips_pdrops++; 143 m_freem(m); 144 return; 145 } 146 #endif 147 va_start(ap, m); 148 iphlen = va_arg(ap, int); 149 va_end(ap); 150 151 _ipip_input(m, iphlen, NULL); 152 } 153 #endif /* INET */ 154 155 /* 156 * ipip_input gets called when we receive an IP{46} encapsulated packet, 157 * either because we got it at a real interface, or because AH or ESP 158 * were being used in tunnel mode (in which case the rcvif element will 159 * contain the address of the encX interface associated with the tunnel. 160 */ 161 162 static void 163 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 164 { 165 register struct sockaddr_in *sin; 166 register struct ifnet *ifp; 167 register struct ifaddr *ifa; 168 struct ip *ipo; 169 #ifdef INET6 170 register struct sockaddr_in6 *sin6; 171 struct ip6_hdr *ip6 = NULL; 172 u_int8_t itos; 173 #endif 174 u_int8_t nxt; 175 int isr; 176 u_int8_t otos; 177 u_int8_t v; 178 int hlen; 179 180 ipipstat.ipips_ipackets++; 181 182 m_copydata(m, 0, 1, &v); 183 184 switch (v >> 4) { 185 #ifdef INET 186 case 4: 187 hlen = sizeof(struct ip); 188 break; 189 #endif /* INET */ 190 #ifdef INET6 191 case 6: 192 hlen = sizeof(struct ip6_hdr); 193 break; 194 #endif 195 default: 196 ipipstat.ipips_family++; 197 m_freem(m); 198 return /* EAFNOSUPPORT */; 199 } 200 201 /* Bring the IP header in the first mbuf, if not there already */ 202 if (m->m_len < hlen) { 203 if ((m = m_pullup(m, hlen)) == NULL) { 204 DPRINTF(("ipip_input: m_pullup (1) failed\n")); 205 ipipstat.ipips_hdrops++; 206 return; 207 } 208 } 209 210 ipo = mtod(m, struct ip *); 211 212 #ifdef MROUTING 213 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 214 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 215 ipip_mroute_input (m, iphlen); 216 return; 217 } 218 } 219 #endif /* MROUTING */ 220 221 /* Keep outer ecn field. */ 222 switch (v >> 4) { 223 #ifdef INET 224 case 4: 225 otos = ipo->ip_tos; 226 break; 227 #endif /* INET */ 228 #ifdef INET6 229 case 6: 230 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 231 break; 232 #endif 233 default: 234 panic("ipip_input: unknown ip version %u (outer)", v>>4); 235 } 236 237 /* Remove outer IP header */ 238 m_adj(m, iphlen); 239 240 /* Sanity check */ 241 if (m->m_pkthdr.len < sizeof(struct ip)) { 242 ipipstat.ipips_hdrops++; 243 m_freem(m); 244 return; 245 } 246 247 m_copydata(m, 0, 1, &v); 248 249 switch (v >> 4) { 250 #ifdef INET 251 case 4: 252 hlen = sizeof(struct ip); 253 break; 254 #endif /* INET */ 255 256 #ifdef INET6 257 case 6: 258 hlen = sizeof(struct ip6_hdr); 259 break; 260 #endif 261 default: 262 ipipstat.ipips_family++; 263 m_freem(m); 264 return; /* EAFNOSUPPORT */ 265 } 266 267 /* 268 * Bring the inner IP header in the first mbuf, if not there already. 269 */ 270 if (m->m_len < hlen) { 271 if ((m = m_pullup(m, hlen)) == NULL) { 272 DPRINTF(("ipip_input: m_pullup (2) failed\n")); 273 ipipstat.ipips_hdrops++; 274 return; 275 } 276 } 277 278 /* 279 * RFC 1853 specifies that the inner TTL should not be touched on 280 * decapsulation. There's no reason this comment should be here, but 281 * this is as good as any a position. 282 */ 283 284 /* Some sanity checks in the inner IP header */ 285 switch (v >> 4) { 286 #ifdef INET 287 case 4: 288 ipo = mtod(m, struct ip *); 289 nxt = ipo->ip_p; 290 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 291 break; 292 #endif /* INET */ 293 #ifdef INET6 294 case 6: 295 ip6 = (struct ip6_hdr *) ipo; 296 nxt = ip6->ip6_nxt; 297 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 298 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 299 ip6->ip6_flow &= ~htonl(0xff << 20); 300 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 301 break; 302 #endif 303 default: 304 panic("ipip_input: unknown ip version %u (inner)", v>>4); 305 } 306 307 /* Check for local address spoofing. */ 308 if ((m->m_pkthdr.rcvif == NULL || 309 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 310 ipip_allow != 2) { 311 IFNET_RLOCK(); 312 for (ifp = ifnet.tqh_first; ifp != 0; 313 ifp = ifp->if_list.tqe_next) { 314 for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; 315 ifa = ifa->ifa_list.tqe_next) { 316 #ifdef INET 317 if (ipo) { 318 if (ifa->ifa_addr->sa_family != 319 AF_INET) 320 continue; 321 322 sin = (struct sockaddr_in *) ifa->ifa_addr; 323 324 if (sin->sin_addr.s_addr == 325 ipo->ip_src.s_addr) { 326 ipipstat.ipips_spoof++; 327 m_freem(m); 328 IFNET_RUNLOCK(); 329 return; 330 } 331 } 332 #endif /* INET */ 333 334 #ifdef INET6 335 if (ip6) { 336 if (ifa->ifa_addr->sa_family != 337 AF_INET6) 338 continue; 339 340 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 341 342 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 343 ipipstat.ipips_spoof++; 344 m_freem(m); 345 IFNET_RUNLOCK(); 346 return; 347 } 348 349 } 350 #endif /* INET6 */ 351 } 352 } 353 IFNET_RUNLOCK(); 354 } 355 356 /* Statistics */ 357 ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen; 358 359 /* 360 * Interface pointer stays the same; if no IPsec processing has 361 * been done (or will be done), this will point to a normal 362 * interface. Otherwise, it'll point to an enc interface, which 363 * will allow a packet filter to distinguish between secure and 364 * untrusted packets. 365 */ 366 367 switch (v >> 4) { 368 #ifdef INET 369 case 4: 370 isr = NETISR_IP; 371 break; 372 #endif 373 #ifdef INET6 374 case 6: 375 isr = NETISR_IPV6; 376 break; 377 #endif 378 default: 379 panic("ipip_input: should never reach here"); 380 } 381 382 if (!netisr_queue(isr, m)) { 383 ipipstat.ipips_qfull++; 384 DPRINTF(("ipip_input: packet dropped because of full queue\n")); 385 } 386 } 387 388 int 389 ipip_output( 390 struct mbuf *m, 391 struct ipsecrequest *isr, 392 struct mbuf **mp, 393 int skip, 394 int protoff 395 ) 396 { 397 struct secasvar *sav; 398 u_int8_t tp, otos; 399 struct secasindex *saidx; 400 int error; 401 #ifdef INET 402 u_int8_t itos; 403 struct ip *ipo; 404 #endif /* INET */ 405 #ifdef INET6 406 struct ip6_hdr *ip6, *ip6o; 407 #endif /* INET6 */ 408 409 #if 0 410 SPLASSERT(net, "ipip_output"); 411 #endif 412 413 sav = isr->sav; 414 KASSERT(sav != NULL, ("ipip_output: null SA")); 415 KASSERT(sav->sah != NULL, ("ipip_output: null SAH")); 416 417 /* XXX Deal with empty TDB source/destination addresses. */ 418 419 m_copydata(m, 0, 1, &tp); 420 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 421 422 saidx = &sav->sah->saidx; 423 switch (saidx->dst.sa.sa_family) { 424 #ifdef INET 425 case AF_INET: 426 if (saidx->src.sa.sa_family != AF_INET || 427 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 428 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 429 DPRINTF(("ipip_output: unspecified tunnel endpoint " 430 "address in SA %s/%08lx\n", 431 ipsec_address(&saidx->dst), 432 (u_long) ntohl(sav->spi))); 433 ipipstat.ipips_unspec++; 434 error = EINVAL; 435 goto bad; 436 } 437 438 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 439 if (m == 0) { 440 DPRINTF(("ipip_output: M_PREPEND failed\n")); 441 ipipstat.ipips_hdrops++; 442 error = ENOBUFS; 443 goto bad; 444 } 445 446 ipo = mtod(m, struct ip *); 447 448 ipo->ip_v = IPVERSION; 449 ipo->ip_hl = 5; 450 ipo->ip_len = htons(m->m_pkthdr.len); 451 ipo->ip_ttl = ip_defttl; 452 ipo->ip_sum = 0; 453 ipo->ip_src = saidx->src.sin.sin_addr; 454 ipo->ip_dst = saidx->dst.sin.sin_addr; 455 456 #ifdef RANDOM_IP_ID 457 ipo->ip_id = ip_randomid(); 458 #else 459 ipo->ip_id = htons(ip_id++); 460 #endif 461 462 /* If the inner protocol is IP... */ 463 if (tp == IPVERSION) { 464 /* Save ECN notification */ 465 m_copydata(m, sizeof(struct ip) + 466 offsetof(struct ip, ip_tos), 467 sizeof(u_int8_t), (caddr_t) &itos); 468 469 ipo->ip_p = IPPROTO_IPIP; 470 471 /* 472 * We should be keeping tunnel soft-state and 473 * send back ICMPs if needed. 474 */ 475 m_copydata(m, sizeof(struct ip) + 476 offsetof(struct ip, ip_off), 477 sizeof(u_int16_t), (caddr_t) &ipo->ip_off); 478 ipo->ip_off = ntohs(ipo->ip_off); 479 ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK); 480 ipo->ip_off = htons(ipo->ip_off); 481 } 482 #ifdef INET6 483 else if (tp == (IPV6_VERSION >> 4)) { 484 u_int32_t itos32; 485 486 /* Save ECN notification. */ 487 m_copydata(m, sizeof(struct ip) + 488 offsetof(struct ip6_hdr, ip6_flow), 489 sizeof(u_int32_t), (caddr_t) &itos32); 490 itos = ntohl(itos32) >> 20; 491 ipo->ip_p = IPPROTO_IPV6; 492 ipo->ip_off = 0; 493 } 494 #endif /* INET6 */ 495 else { 496 goto nofamily; 497 } 498 499 otos = 0; 500 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 501 ipo->ip_tos = otos; 502 break; 503 #endif /* INET */ 504 505 #ifdef INET6 506 case AF_INET6: 507 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 508 saidx->src.sa.sa_family != AF_INET6 || 509 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 510 DPRINTF(("ipip_output: unspecified tunnel endpoint " 511 "address in SA %s/%08lx\n", 512 ipsec_address(&saidx->dst), 513 (u_long) ntohl(sav->spi))); 514 ipipstat.ipips_unspec++; 515 error = ENOBUFS; 516 goto bad; 517 } 518 519 /* scoped address handling */ 520 ip6 = mtod(m, struct ip6_hdr *); 521 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 522 ip6->ip6_src.s6_addr16[1] = 0; 523 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 524 ip6->ip6_dst.s6_addr16[1] = 0; 525 526 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 527 if (m == 0) { 528 DPRINTF(("ipip_output: M_PREPEND failed\n")); 529 ipipstat.ipips_hdrops++; 530 *mp = NULL; 531 error = ENOBUFS; 532 goto bad; 533 } 534 535 /* Initialize IPv6 header */ 536 ip6o = mtod(m, struct ip6_hdr *); 537 ip6o->ip6_flow = 0; 538 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 539 ip6o->ip6_vfc |= IPV6_VERSION; 540 ip6o->ip6_plen = htons(m->m_pkthdr.len); 541 ip6o->ip6_hlim = ip_defttl; 542 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 543 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 544 545 #ifdef INET 546 if (tp == IPVERSION) { 547 /* Save ECN notification */ 548 m_copydata(m, sizeof(struct ip6_hdr) + 549 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 550 (caddr_t) &itos); 551 552 /* This is really IPVERSION. */ 553 ip6o->ip6_nxt = IPPROTO_IPIP; 554 } else 555 #endif /* INET */ 556 if (tp == (IPV6_VERSION >> 4)) { 557 u_int32_t itos32; 558 559 /* Save ECN notification. */ 560 m_copydata(m, sizeof(struct ip6_hdr) + 561 offsetof(struct ip6_hdr, ip6_flow), 562 sizeof(u_int32_t), (caddr_t) &itos32); 563 itos = ntohl(itos32) >> 20; 564 565 ip6o->ip6_nxt = IPPROTO_IPV6; 566 } else { 567 goto nofamily; 568 } 569 570 otos = 0; 571 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 572 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 573 break; 574 #endif /* INET6 */ 575 576 default: 577 nofamily: 578 DPRINTF(("ipip_output: unsupported protocol family %u\n", 579 saidx->dst.sa.sa_family)); 580 ipipstat.ipips_family++; 581 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 582 goto bad; 583 } 584 585 ipipstat.ipips_opackets++; 586 *mp = m; 587 588 #ifdef INET 589 if (saidx->dst.sa.sa_family == AF_INET) { 590 #if 0 591 if (sav->tdb_xform->xf_type == XF_IP4) 592 tdb->tdb_cur_bytes += 593 m->m_pkthdr.len - sizeof(struct ip); 594 #endif 595 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip); 596 } 597 #endif /* INET */ 598 599 #ifdef INET6 600 if (saidx->dst.sa.sa_family == AF_INET6) { 601 #if 0 602 if (sav->tdb_xform->xf_type == XF_IP4) 603 tdb->tdb_cur_bytes += 604 m->m_pkthdr.len - sizeof(struct ip6_hdr); 605 #endif 606 ipipstat.ipips_obytes += 607 m->m_pkthdr.len - sizeof(struct ip6_hdr); 608 } 609 #endif /* INET6 */ 610 611 return 0; 612 bad: 613 if (m) 614 m_freem(m), *mp = NULL; 615 return (error); 616 } 617 618 #ifdef FAST_IPSEC 619 static int 620 ipe4_init(struct secasvar *sav, struct xformsw *xsp) 621 { 622 sav->tdb_xform = xsp; 623 return 0; 624 } 625 626 static int 627 ipe4_zeroize(struct secasvar *sav) 628 { 629 sav->tdb_xform = NULL; 630 return 0; 631 } 632 633 static int 634 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff) 635 { 636 /* This is a rather serious mistake, so no conditional printing. */ 637 printf("ipe4_input: should never be called\n"); 638 if (m) 639 m_freem(m); 640 return EOPNOTSUPP; 641 } 642 643 static struct xformsw ipe4_xformsw = { 644 XF_IP4, 0, "IPv4 Simple Encapsulation", 645 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 646 }; 647 648 extern struct domain inetdomain; 649 static struct ipprotosw ipe4_protosw[] = { 650 { SOCK_RAW, &inetdomain, IPPROTO_IPV4, PR_ATOMIC|PR_ADDR|PR_LASTHDR, 651 (pr_in_input_t*) ip4_input, 652 0, 0, rip_ctloutput, 653 0, 654 0, 0, 0, 0, 655 &rip_usrreqs 656 }, 657 #ifdef INET6 658 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR|PR_LASTHDR, 659 (pr_in_input_t*) ip4_input, 660 0, 0, rip_ctloutput, 661 0, 662 0, 0, 0, 0, 663 &rip_usrreqs 664 } 665 #endif 666 }; 667 668 /* 669 * Check the encapsulated packet to see if we want it 670 */ 671 static int 672 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 673 { 674 /* 675 * Only take packets coming from IPSEC tunnels; the rest 676 * must be handled by the gif tunnel code. Note that we 677 * also return a minimum priority when we want the packet 678 * so any explicit gif tunnels take precedence. 679 */ 680 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 681 } 682 683 static void 684 ipe4_attach(void) 685 { 686 xform_register(&ipe4_xformsw); 687 /* attach to encapsulation framework */ 688 /* XXX save return cookie for detach on module remove */ 689 (void) encap_attach_func(AF_INET, -1, 690 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL); 691 #ifdef INET6 692 (void) encap_attach_func(AF_INET6, -1, 693 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL); 694 #endif 695 } 696 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 697 #endif /* FAST_IPSEC */
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