1 /* $NetBSD: xform_ipip.c,v 1.58 2018/01/24 14:39:14 maxv Exp $ */ 2 /* $FreeBSD: src/sys/netipsec/xform_ipip.c,v 1.3.2.1 2003/01/24 05:11:36 sam Exp $ */ 3 /* $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */ 4 5 /* 6 * The authors of this code are John Ioannidis (ji@tla.org), 7 * Angelos D. Keromytis (kermit@csd.uch.gr) and 8 * Niels Provos (provos@physnet.uni-hamburg.de). 9 * 10 * The original version of this code was written by John Ioannidis 11 * for BSD/OS in Athens, Greece, in November 1995. 12 * 13 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 14 * by Angelos D. Keromytis. 15 * 16 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 17 * and Niels Provos. 18 * 19 * Additional features in 1999 by Angelos D. Keromytis. 20 * 21 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 22 * Angelos D. Keromytis and Niels Provos. 23 * Copyright (c) 2001, Angelos D. Keromytis. 24 * 25 * Permission to use, copy, and modify this software with or without fee 26 * is hereby granted, provided that this entire notice is included in 27 * all copies of any software which is or includes a copy or 28 * modification of this software. 29 * You may use this code under the GNU public license if you so wish. Please 30 * contribute changes back to the authors under this freer than GPL license 31 * so that we may further the use of strong encryption without limitations to 32 * all. 33 * 34 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 35 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 36 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 37 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 38 * PURPOSE. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: xform_ipip.c,v 1.58 2018/01/24 14:39:14 maxv Exp $"); 43 44 /* 45 * IP-inside-IP processing 46 */ 47 #if defined(_KERNEL_OPT) 48 #include "opt_inet.h" 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/kernel.h> 56 #include <sys/protosw.h> 57 #include <sys/sysctl.h> 58 59 #include <net/if.h> 60 #include <net/route.h> 61 #include <net/netisr.h> 62 63 #include <netinet/in.h> 64 #include <netinet/in_systm.h> 65 #include <netinet/in_var.h> 66 #include <netinet/ip.h> 67 #include <netinet/ip_ecn.h> 68 #include <netinet/ip_var.h> 69 #include <netinet/ip_encap.h> 70 71 #include <netipsec/ipsec.h> 72 #include <netipsec/ipsec_private.h> 73 #include <netipsec/xform.h> 74 75 #include <netipsec/ipip_var.h> 76 77 #ifdef MROUTING 78 #include <netinet/ip_mroute.h> 79 #endif 80 81 #ifdef INET6 82 #include <netinet/ip6.h> 83 #include <netipsec/ipsec6.h> 84 #include <netinet6/in6_var.h> 85 #include <netinet6/ip6protosw.h> 86 #endif 87 88 #include <netipsec/key.h> 89 #include <netipsec/key_debug.h> 90 91 typedef void pr_in_input_t (struct mbuf *m, ...); 92 93 /* 94 * We can control the acceptance of IP4 packets by altering the sysctl 95 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance. 96 */ 97 int ipip_allow = 0; 98 99 percpu_t *ipipstat_percpu; 100 101 #ifdef SYSCTL_DECL 102 SYSCTL_DECL(_net_inet_ipip); 103 104 SYSCTL_INT(_net_inet_ipip, OID_AUTO, 105 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, ""); 106 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 107 stats, CTLFLAG_RD, &ipipstat, ipipstat, ""); 108 109 #endif 110 111 void ipe4_attach(void); 112 113 114 /* XXX IPCOMP */ 115 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 116 117 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 118 119 #ifdef INET6 120 /* 121 * Really only a wrapper for ipip_input(), for use with IPv6. 122 */ 123 int 124 ip4_input6(struct mbuf **m, int *offp, int proto, void *eparg __unused) 125 { 126 #if 0 127 /* If we do not accept IP-in-IP explicitly, drop. */ 128 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 129 DPRINTF(("%s: dropped due to policy\n", __func__)); 130 IPIP_STATINC(IPIP_STAT_PDROPS); 131 m_freem(*m); 132 return IPPROTO_DONE; 133 } 134 #endif 135 _ipip_input(*m, *offp, NULL); 136 return IPPROTO_DONE; 137 } 138 #endif /* INET6 */ 139 140 #ifdef INET 141 /* 142 * Really only a wrapper for ipip_input(), for use with IPv4. 143 */ 144 void 145 ip4_input(struct mbuf *m, int off, int proto, void *eparg __unused) 146 { 147 148 #if 0 149 /* If we do not accept IP-in-IP explicitly, drop. */ 150 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { 151 DPRINTF(("%s: dropped due to policy\n", __func__)); 152 IPIP_STATINC(IPIP_STAT_PDROPS); 153 m_freem(m); 154 return; 155 } 156 #endif 157 158 _ipip_input(m, off, NULL); 159 } 160 #endif /* INET */ 161 162 /* 163 * ipip_input gets called when we receive an IP{46} encapsulated packet, 164 * either because we got it at a real interface, or because AH or ESP 165 * were being used in tunnel mode (in which case the rcvif element will 166 * contain the address of the encX interface associated with the tunnel. 167 */ 168 169 static void 170 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 171 { 172 register struct sockaddr_in *sin; 173 register struct ifnet *ifp; 174 register struct ifaddr *ifa; 175 pktqueue_t *pktq = NULL; 176 struct ip *ipo; 177 #ifdef INET6 178 register struct sockaddr_in6 *sin6; 179 struct ip6_hdr *ip6 = NULL; 180 uint8_t itos; 181 #endif 182 uint8_t otos; 183 uint8_t v; 184 int hlen; 185 186 IPIP_STATINC(IPIP_STAT_IPACKETS); 187 188 m_copydata(m, 0, 1, &v); 189 190 switch (v >> 4) { 191 #ifdef INET 192 case 4: 193 hlen = sizeof(struct ip); 194 break; 195 #endif /* INET */ 196 #ifdef INET6 197 case 6: 198 hlen = sizeof(struct ip6_hdr); 199 break; 200 #endif 201 default: 202 DPRINTF(("%s: bad protocol version 0x%x (%u) " 203 "for outer header\n", __func__, v, v>>4)); 204 IPIP_STATINC(IPIP_STAT_FAMILY); 205 m_freem(m); 206 return /* EAFNOSUPPORT */; 207 } 208 209 /* Bring the IP header in the first mbuf, if not there already */ 210 if (m->m_len < hlen) { 211 if ((m = m_pullup(m, hlen)) == NULL) { 212 DPRINTF(("%s: m_pullup (1) failed\n", __func__)); 213 IPIP_STATINC(IPIP_STAT_HDROPS); 214 return; 215 } 216 } 217 218 ipo = mtod(m, struct ip *); 219 220 #ifdef MROUTING 221 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 222 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 223 ipip_mroute_input (m, iphlen); 224 return; 225 } 226 } 227 #endif /* MROUTING */ 228 229 /* Keep outer ecn field. */ 230 switch (v >> 4) { 231 #ifdef INET 232 case 4: 233 otos = ipo->ip_tos; 234 break; 235 #endif /* INET */ 236 #ifdef INET6 237 case 6: 238 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 239 break; 240 #endif 241 default: 242 panic("%s: unknown ip version %u (outer)", __func__, v >> 4); 243 } 244 245 /* Remove outer IP header */ 246 m_adj(m, iphlen); 247 248 /* Sanity check */ 249 if (m->m_pkthdr.len < sizeof(struct ip)) { 250 IPIP_STATINC(IPIP_STAT_HDROPS); 251 m_freem(m); 252 return; 253 } 254 255 m_copydata(m, 0, 1, &v); 256 257 switch (v >> 4) { 258 #ifdef INET 259 case 4: 260 hlen = sizeof(struct ip); 261 break; 262 #endif /* INET */ 263 264 #ifdef INET6 265 case 6: 266 hlen = sizeof(struct ip6_hdr); 267 break; 268 #endif 269 default: 270 DPRINTF(("%s: bad protocol version %#x (%u) " 271 "for inner header\n", __func__, v, v >> 4)); 272 IPIP_STATINC(IPIP_STAT_FAMILY); 273 m_freem(m); 274 return; /* EAFNOSUPPORT */ 275 } 276 277 /* 278 * Bring the inner IP header in the first mbuf, if not there already. 279 */ 280 if (m->m_len < hlen) { 281 if ((m = m_pullup(m, hlen)) == NULL) { 282 DPRINTF(("%s: m_pullup (2) failed\n", __func__)); 283 IPIP_STATINC(IPIP_STAT_HDROPS); 284 return; 285 } 286 } 287 288 /* 289 * RFC 1853 specifies that the inner TTL should not be touched on 290 * decapsulation. There's no reason this comment should be here, but 291 * this is as good as any a position. 292 */ 293 294 /* Some sanity checks in the inner IP header */ 295 switch (v >> 4) { 296 #ifdef INET 297 case 4: 298 ipo = mtod(m, struct ip *); 299 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 300 break; 301 #endif /* INET */ 302 #ifdef INET6 303 case 6: 304 ipo = NULL; 305 ip6 = mtod(m, struct ip6_hdr *); 306 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 307 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 308 ip6->ip6_flow &= ~htonl(0xff << 20); 309 ip6->ip6_flow |= htonl((uint32_t) itos << 20); 310 break; 311 #endif 312 default: 313 panic("%s: unknown ip version %u (inner)", __func__, v>>4); 314 } 315 316 /* Check for local address spoofing. */ 317 if ((m_get_rcvif_NOMPSAFE(m) == NULL || 318 !(m_get_rcvif_NOMPSAFE(m)->if_flags & IFF_LOOPBACK)) && 319 ipip_allow != 2) { 320 int s = pserialize_read_enter(); 321 IFNET_READER_FOREACH(ifp) { 322 IFADDR_READER_FOREACH(ifa, ifp) { 323 #ifdef INET 324 if (ipo) { 325 if (ifa->ifa_addr->sa_family != 326 AF_INET) 327 continue; 328 329 sin = (struct sockaddr_in *) ifa->ifa_addr; 330 331 if (sin->sin_addr.s_addr == 332 ipo->ip_src.s_addr) { 333 pserialize_read_exit(s); 334 IPIP_STATINC(IPIP_STAT_SPOOF); 335 m_freem(m); 336 return; 337 } 338 } 339 #endif /* INET */ 340 341 #ifdef INET6 342 if (ip6) { 343 if (ifa->ifa_addr->sa_family != 344 AF_INET6) 345 continue; 346 347 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 348 349 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 350 pserialize_read_exit(s); 351 IPIP_STATINC(IPIP_STAT_SPOOF); 352 m_freem(m); 353 return; 354 } 355 356 } 357 #endif /* INET6 */ 358 } 359 } 360 pserialize_read_exit(s); 361 } 362 363 /* Statistics */ 364 IPIP_STATADD(IPIP_STAT_IBYTES, m->m_pkthdr.len - iphlen); 365 366 /* 367 * Interface pointer stays the same; if no IPsec processing has 368 * been done (or will be done), this will point to a normal 369 * interface. Otherwise, it'll point to an enc interface, which 370 * will allow a packet filter to distinguish between secure and 371 * untrusted packets. 372 */ 373 374 switch (v >> 4) { 375 #ifdef INET 376 case 4: 377 pktq = ip_pktq; 378 break; 379 #endif 380 #ifdef INET6 381 case 6: 382 pktq = ip6_pktq; 383 break; 384 #endif 385 default: 386 panic("%s: should never reach here", __func__); 387 } 388 389 int s = splnet(); 390 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 391 IPIP_STATINC(IPIP_STAT_QFULL); 392 m_freem(m); 393 } 394 splx(s); 395 } 396 397 int 398 ipip_output( 399 struct mbuf *m, 400 const struct ipsecrequest *isr, 401 struct secasvar *sav, 402 struct mbuf **mp, 403 int skip, 404 int protoff 405 ) 406 { 407 char buf[IPSEC_ADDRSTRLEN]; 408 uint8_t tp, otos; 409 struct secasindex *saidx; 410 int error; 411 #ifdef INET 412 uint8_t itos; 413 struct ip *ipo; 414 #endif /* INET */ 415 #ifdef INET6 416 struct ip6_hdr *ip6, *ip6o; 417 #endif /* INET6 */ 418 419 IPSEC_SPLASSERT_SOFTNET(__func__); 420 KASSERT(sav != NULL); 421 422 /* XXX Deal with empty TDB source/destination addresses. */ 423 424 m_copydata(m, 0, 1, &tp); 425 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 426 427 saidx = &sav->sah->saidx; 428 switch (saidx->dst.sa.sa_family) { 429 #ifdef INET 430 case AF_INET: 431 if (saidx->src.sa.sa_family != AF_INET || 432 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 433 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 434 DPRINTF(("%s: unspecified tunnel endpoint " 435 "address in SA %s/%08lx\n", __func__, 436 ipsec_address(&saidx->dst, buf, sizeof(buf)), 437 (u_long) ntohl(sav->spi))); 438 IPIP_STATINC(IPIP_STAT_UNSPEC); 439 error = EINVAL; 440 goto bad; 441 } 442 443 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 444 if (m == 0) { 445 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 446 IPIP_STATINC(IPIP_STAT_HDROPS); 447 error = ENOBUFS; 448 goto bad; 449 } 450 451 ipo = mtod(m, struct ip *); 452 453 ipo->ip_v = IPVERSION; 454 ipo->ip_hl = 5; 455 ipo->ip_len = htons(m->m_pkthdr.len); 456 ipo->ip_ttl = ip_defttl; 457 ipo->ip_sum = 0; 458 ipo->ip_src = saidx->src.sin.sin_addr; 459 ipo->ip_dst = saidx->dst.sin.sin_addr; 460 ipo->ip_id = ip_newid(NULL); 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(uint8_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(uint16_t), &ipo->ip_off); 478 ipo->ip_off &= ~ htons(IP_DF | IP_MF | IP_OFFMASK); 479 } 480 #ifdef INET6 481 else if (tp == (IPV6_VERSION >> 4)) { 482 uint32_t itos32; 483 484 /* Save ECN notification. */ 485 m_copydata(m, sizeof(struct ip) + 486 offsetof(struct ip6_hdr, ip6_flow), 487 sizeof(uint32_t), &itos32); 488 itos = ntohl(itos32) >> 20; 489 ipo->ip_p = IPPROTO_IPV6; 490 ipo->ip_off = 0; 491 } 492 #endif /* INET6 */ 493 else { 494 goto nofamily; 495 } 496 497 otos = 0; 498 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 499 ipo->ip_tos = otos; 500 break; 501 #endif /* INET */ 502 503 #ifdef INET6 504 case AF_INET6: 505 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 506 saidx->src.sa.sa_family != AF_INET6 || 507 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 508 DPRINTF(("%s: unspecified tunnel endpoint " 509 "address in SA %s/%08lx\n", __func__, 510 ipsec_address(&saidx->dst, buf, sizeof(buf)), 511 (u_long) ntohl(sav->spi))); 512 IPIP_STATINC(IPIP_STAT_UNSPEC); 513 error = ENOBUFS; 514 goto bad; 515 } 516 517 if (tp == (IPV6_VERSION >> 4)) { 518 /* scoped address handling */ 519 ip6 = mtod(m, struct ip6_hdr *); 520 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 521 ip6->ip6_src.s6_addr16[1] = 0; 522 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 523 ip6->ip6_dst.s6_addr16[1] = 0; 524 } 525 526 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 527 if (m == 0) { 528 DPRINTF(("%s: M_PREPEND failed\n", __func__)); 529 IPIP_STATINC(IPIP_STAT_HDROPS); 530 error = ENOBUFS; 531 goto bad; 532 } 533 534 /* Initialize IPv6 header */ 535 ip6o = mtod(m, struct ip6_hdr *); 536 ip6o->ip6_flow = 0; 537 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 538 ip6o->ip6_vfc |= IPV6_VERSION; 539 ip6o->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6o)); 540 ip6o->ip6_hlim = ip_defttl; 541 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 542 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 543 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_dst)) 544 ip6o->ip6_dst.s6_addr16[1] = htons(saidx->dst.sin6.sin6_scope_id); 545 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_src)) 546 ip6o->ip6_src.s6_addr16[1] = htons(saidx->src.sin6.sin6_scope_id); 547 548 #ifdef INET 549 if (tp == IPVERSION) { 550 /* Save ECN notification */ 551 m_copydata(m, sizeof(struct ip6_hdr) + 552 offsetof(struct ip, ip_tos), sizeof(uint8_t), 553 &itos); 554 555 /* This is really IPVERSION. */ 556 ip6o->ip6_nxt = IPPROTO_IPIP; 557 } else 558 #endif /* INET */ 559 if (tp == (IPV6_VERSION >> 4)) { 560 uint32_t itos32; 561 562 /* Save ECN notification. */ 563 m_copydata(m, sizeof(struct ip6_hdr) + 564 offsetof(struct ip6_hdr, ip6_flow), 565 sizeof(uint32_t), &itos32); 566 itos = ntohl(itos32) >> 20; 567 568 ip6o->ip6_nxt = IPPROTO_IPV6; 569 } else { 570 goto nofamily; 571 } 572 573 otos = 0; 574 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 575 ip6o->ip6_flow |= htonl((uint32_t) otos << 20); 576 break; 577 #endif /* INET6 */ 578 579 default: 580 nofamily: 581 DPRINTF(("%s: unsupported protocol family %u\n", __func__, 582 saidx->dst.sa.sa_family)); 583 IPIP_STATINC(IPIP_STAT_FAMILY); 584 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 585 goto bad; 586 } 587 588 IPIP_STATINC(IPIP_STAT_OPACKETS); 589 *mp = m; 590 591 #ifdef INET 592 if (saidx->dst.sa.sa_family == AF_INET) { 593 #if 0 594 if (sav->tdb_xform->xf_type == XF_IP4) 595 tdb->tdb_cur_bytes += 596 m->m_pkthdr.len - sizeof(struct ip); 597 #endif 598 IPIP_STATADD(IPIP_STAT_OBYTES, 599 m->m_pkthdr.len - sizeof(struct ip)); 600 } 601 #endif /* INET */ 602 603 #ifdef INET6 604 if (saidx->dst.sa.sa_family == AF_INET6) { 605 #if 0 606 if (sav->tdb_xform->xf_type == XF_IP4) 607 tdb->tdb_cur_bytes += 608 m->m_pkthdr.len - sizeof(struct ip6_hdr); 609 #endif 610 IPIP_STATADD(IPIP_STAT_OBYTES, 611 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 612 } 613 #endif /* INET6 */ 614 615 return 0; 616 bad: 617 if (m) 618 m_freem(m); 619 *mp = NULL; 620 return (error); 621 } 622 623 static int 624 ipe4_init(struct secasvar *sav, const struct xformsw *xsp) 625 { 626 sav->tdb_xform = xsp; 627 return 0; 628 } 629 630 static int 631 ipe4_zeroize(struct secasvar *sav) 632 { 633 sav->tdb_xform = NULL; 634 return 0; 635 } 636 637 static int 638 ipe4_input( 639 struct mbuf *m, 640 struct secasvar *sav, 641 int skip, 642 int protoff 643 ) 644 { 645 /* This is a rather serious mistake, so no conditional printing. */ 646 printf("%s: should never be called\n", __func__); 647 if (m) 648 m_freem(m); 649 return EOPNOTSUPP; 650 } 651 652 static struct xformsw ipe4_xformsw = { 653 .xf_type = XF_IP4, 654 .xf_flags = 0, 655 .xf_name = "IPv4 Simple Encapsulation", 656 .xf_init = ipe4_init, 657 .xf_zeroize = ipe4_zeroize, 658 .xf_input = ipe4_input, 659 .xf_output = ipip_output, 660 .xf_next = NULL, 661 }; 662 663 #ifdef INET 664 static struct encapsw ipe4_encapsw = { 665 .encapsw4 = { 666 .pr_input = ip4_input, 667 .pr_ctlinput = NULL, 668 } 669 }; 670 #endif 671 #ifdef INET6 672 static struct encapsw ipe4_encapsw6 = { 673 .encapsw6 = { 674 .pr_input = ip4_input6, 675 .pr_ctlinput = NULL, 676 } 677 }; 678 #endif 679 680 /* 681 * Check the encapsulated packet to see if we want it 682 */ 683 static int 684 ipe4_encapcheck(struct mbuf *m, 685 int off, 686 int proto, 687 void *arg 688 ) 689 { 690 /* 691 * Only take packets coming from IPSEC tunnels; the rest 692 * must be handled by the gif tunnel code. Note that we 693 * also return a minimum priority when we want the packet 694 * so any explicit gif tunnels take precedence. 695 */ 696 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 697 } 698 699 void 700 ipe4_attach(void) 701 { 702 703 ipipstat_percpu = percpu_alloc(sizeof(uint64_t) * IPIP_NSTATS); 704 705 xform_register(&ipe4_xformsw); 706 /* attach to encapsulation framework */ 707 /* XXX save return cookie for detach on module remove */ 708 709 encapinit(); 710 /* This function is called before ifinit(). Who else gets lock? */ 711 (void)encap_lock_enter(); 712 /* ipe4_encapsw and ipe4_encapsw must be added atomically */ 713 #ifdef INET 714 (void) encap_attach_func(AF_INET, -1, 715 ipe4_encapcheck, &ipe4_encapsw, NULL); 716 #endif 717 #ifdef INET6 718 (void) encap_attach_func(AF_INET6, -1, 719 ipe4_encapcheck, &ipe4_encapsw6, NULL); 720 #endif 721 encap_lock_exit(); 722 } 723