1 /* $NetBSD: xform_ipip.c,v 1.27 2011/06/06 16:48:35 drochner 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 1.27 2011/06/06 16:48:35 drochner Exp $"); 43 44 /* 45 * IP-inside-IP processing 46 */ 47 #include "opt_inet.h" 48 #ifdef __FreeBSD__ 49 #include "opt_inet6.h" 50 #include "opt_random_ip_id.h" 51 #endif /* __FreeBSD__ */ 52 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/mbuf.h> 57 #include <sys/socket.h> 58 #include <sys/kernel.h> 59 #include <sys/protosw.h> 60 #include <sys/sysctl.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <net/netisr.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/in_var.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_ecn.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/ip_encap.h> 73 #ifdef __FreeBSD__ 74 #include <netinet/ipprotosw.h> 75 #endif 76 77 #include <netipsec/ipsec.h> 78 #include <netipsec/ipsec_private.h> 79 #include <netipsec/xform.h> 80 81 #include <netipsec/ipip_var.h> 82 83 #ifdef MROUTING 84 #include <netinet/ip_mroute.h> 85 #endif 86 87 #ifdef INET6 88 #include <netinet/ip6.h> 89 #include <netipsec/ipsec6.h> 90 # ifdef __FreeBSD__ 91 # include <netinet6/ip6_ecn.h> 92 # endif 93 #include <netinet6/in6_var.h> 94 #include <netinet6/ip6protosw.h> 95 #endif 96 97 #include <netipsec/key.h> 98 #include <netipsec/key_debug.h> 99 #include <netipsec/ipsec_osdep.h> 100 101 #include <machine/stdarg.h> 102 103 #ifdef __FreeBSD__ 104 typedef void pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */ 105 #else 106 typedef void pr_in_input_t (struct mbuf *m, ...); 107 #endif 108 109 /* 110 * We can control the acceptance of IP4 packets by altering the sysctl 111 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance. 112 */ 113 int ipip_allow = 0; 114 115 percpu_t *ipipstat_percpu; 116 117 #ifdef SYSCTL_DECL 118 SYSCTL_DECL(_net_inet_ipip); 119 120 SYSCTL_INT(_net_inet_ipip, OID_AUTO, 121 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, ""); 122 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 123 stats, CTLFLAG_RD, &ipipstat, ipipstat, ""); 124 125 #endif 126 127 #ifdef __FreeBSD__ 128 static 129 #endif 130 void ipe4_attach(void); 131 132 133 /* XXX IPCOMP */ 134 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 135 136 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 137 138 #ifdef INET6 139 /* 140 * Really only a wrapper for ipip_input(), for use with IPv6. 141 */ 142 int 143 ip4_input6(struct mbuf **m, int *offp, int proto) 144 { 145 #if 0 146 /* If we do not accept IP-in-IP explicitly, drop. */ 147 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 148 DPRINTF(("ip4_input6: dropped due to policy\n")); 149 IPIP_STATINC(IPIP_STAT_PDROPS); 150 m_freem(*m); 151 return IPPROTO_DONE; 152 } 153 #endif 154 _ipip_input(*m, *offp, NULL); 155 return IPPROTO_DONE; 156 } 157 #endif /* INET6 */ 158 159 #ifdef INET 160 /* 161 * Really only a wrapper for ipip_input(), for use with IPv4. 162 */ 163 void 164 ip4_input(struct mbuf *m, ...) 165 { 166 va_list ap; 167 int iphlen; 168 169 #if 0 170 /* If we do not accept IP-in-IP explicitly, drop. */ 171 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { 172 DPRINTF(("ip4_input: dropped due to policy\n")); 173 IPIP_STATINC(IPIP_STAT_PDROPS); 174 m_freem(m); 175 return; 176 } 177 #endif 178 va_start(ap, m); 179 iphlen = va_arg(ap, int); 180 va_end(ap); 181 182 _ipip_input(m, iphlen, NULL); 183 } 184 #endif /* INET */ 185 186 /* 187 * ipip_input gets called when we receive an IP{46} encapsulated packet, 188 * either because we got it at a real interface, or because AH or ESP 189 * were being used in tunnel mode (in which case the rcvif element will 190 * contain the address of the encX interface associated with the tunnel. 191 */ 192 193 static void 194 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 195 { 196 register struct sockaddr_in *sin; 197 register struct ifnet *ifp; 198 register struct ifaddr *ifa; 199 struct ifqueue *ifq = NULL; 200 struct ip *ipo; 201 #ifdef INET6 202 register struct sockaddr_in6 *sin6; 203 struct ip6_hdr *ip6 = NULL; 204 u_int8_t itos; 205 #endif 206 int isr; 207 u_int8_t otos; 208 u_int8_t v; 209 int hlen; 210 211 IPIP_STATINC(IPIP_STAT_IPACKETS); 212 213 m_copydata(m, 0, 1, &v); 214 215 switch (v >> 4) { 216 #ifdef INET 217 case 4: 218 hlen = sizeof(struct ip); 219 break; 220 #endif /* INET */ 221 #ifdef INET6 222 case 6: 223 hlen = sizeof(struct ip6_hdr); 224 break; 225 #endif 226 default: 227 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 228 "for outer header\n", v, v>>4)); 229 IPIP_STATINC(IPIP_STAT_FAMILY); 230 m_freem(m); 231 return /* EAFNOSUPPORT */; 232 } 233 234 /* Bring the IP header in the first mbuf, if not there already */ 235 if (m->m_len < hlen) { 236 if ((m = m_pullup(m, hlen)) == NULL) { 237 DPRINTF(("ipip_input: m_pullup (1) failed\n")); 238 IPIP_STATINC(IPIP_STAT_HDROPS); 239 return; 240 } 241 } 242 243 ipo = mtod(m, struct ip *); 244 245 #ifdef MROUTING 246 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 247 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 248 ipip_mroute_input (m, iphlen); 249 return; 250 } 251 } 252 #endif /* MROUTING */ 253 254 /* Keep outer ecn field. */ 255 switch (v >> 4) { 256 #ifdef INET 257 case 4: 258 otos = ipo->ip_tos; 259 break; 260 #endif /* INET */ 261 #ifdef INET6 262 case 6: 263 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 264 break; 265 #endif 266 default: 267 panic("ipip_input: unknown ip version %u (outer)", v>>4); 268 } 269 270 /* Remove outer IP header */ 271 m_adj(m, iphlen); 272 273 /* Sanity check */ 274 if (m->m_pkthdr.len < sizeof(struct ip)) { 275 IPIP_STATINC(IPIP_STAT_HDROPS); 276 m_freem(m); 277 return; 278 } 279 280 m_copydata(m, 0, 1, &v); 281 282 switch (v >> 4) { 283 #ifdef INET 284 case 4: 285 hlen = sizeof(struct ip); 286 break; 287 #endif /* INET */ 288 289 #ifdef INET6 290 case 6: 291 hlen = sizeof(struct ip6_hdr); 292 break; 293 #endif 294 default: 295 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 296 "for inner header\n", v, v>>4)); 297 IPIP_STATINC(IPIP_STAT_FAMILY); 298 m_freem(m); 299 return; /* EAFNOSUPPORT */ 300 } 301 302 /* 303 * Bring the inner IP header in the first mbuf, if not there already. 304 */ 305 if (m->m_len < hlen) { 306 if ((m = m_pullup(m, hlen)) == NULL) { 307 DPRINTF(("ipip_input: m_pullup (2) failed\n")); 308 IPIP_STATINC(IPIP_STAT_HDROPS); 309 return; 310 } 311 } 312 313 /* 314 * RFC 1853 specifies that the inner TTL should not be touched on 315 * decapsulation. There's no reason this comment should be here, but 316 * this is as good as any a position. 317 */ 318 319 /* Some sanity checks in the inner IP header */ 320 switch (v >> 4) { 321 #ifdef INET 322 case 4: 323 ipo = mtod(m, struct ip *); 324 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 325 break; 326 #endif /* INET */ 327 #ifdef INET6 328 case 6: 329 ip6 = (struct ip6_hdr *) ipo; 330 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 331 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 332 ip6->ip6_flow &= ~htonl(0xff << 20); 333 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 334 break; 335 #endif 336 default: 337 panic("ipip_input: unknown ip version %u (inner)", v>>4); 338 } 339 340 /* Check for local address spoofing. */ 341 if ((m->m_pkthdr.rcvif == NULL || 342 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 343 ipip_allow != 2) { 344 IFNET_FOREACH(ifp) { 345 IFADDR_FOREACH(ifa, ifp) { 346 #ifdef INET 347 if (ipo) { 348 if (ifa->ifa_addr->sa_family != 349 AF_INET) 350 continue; 351 352 sin = (struct sockaddr_in *) ifa->ifa_addr; 353 354 if (sin->sin_addr.s_addr == 355 ipo->ip_src.s_addr) { 356 IPIP_STATINC(IPIP_STAT_SPOOF); 357 m_freem(m); 358 return; 359 } 360 } 361 #endif /* INET */ 362 363 #ifdef INET6 364 if (ip6) { 365 if (ifa->ifa_addr->sa_family != 366 AF_INET6) 367 continue; 368 369 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 370 371 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 372 IPIP_STATINC(IPIP_STAT_SPOOF); 373 m_freem(m); 374 return; 375 } 376 377 } 378 #endif /* INET6 */ 379 } 380 } 381 } 382 383 /* Statistics */ 384 IPIP_STATADD(IPIP_STAT_IBYTES, m->m_pkthdr.len - iphlen); 385 386 /* 387 * Interface pointer stays the same; if no IPsec processing has 388 * been done (or will be done), this will point to a normal 389 * interface. Otherwise, it'll point to an enc interface, which 390 * will allow a packet filter to distinguish between secure and 391 * untrusted packets. 392 */ 393 394 switch (v >> 4) { 395 #ifdef INET 396 case 4: 397 ifq = &ipintrq; 398 isr = NETISR_IP; 399 break; 400 #endif 401 #ifdef INET6 402 case 6: 403 ifq = &ip6intrq; 404 isr = NETISR_IPV6; 405 break; 406 #endif 407 default: 408 panic("ipip_input: should never reach here"); 409 } 410 411 if (!IF_HANDOFF(ifq, m, NULL)) { 412 IPIP_STATINC(IPIP_STAT_QFULL); 413 414 DPRINTF(("ipip_input: packet dropped because of full queue\n")); 415 } else { 416 schednetisr(isr); 417 } 418 } 419 420 int 421 ipip_output( 422 struct mbuf *m, 423 struct ipsecrequest *isr, 424 struct mbuf **mp, 425 int skip, 426 int protoff 427 ) 428 { 429 const struct secasvar *sav; 430 u_int8_t tp, otos; 431 struct secasindex *saidx; 432 int error; 433 #ifdef INET 434 u_int8_t itos; 435 struct ip *ipo; 436 #endif /* INET */ 437 #ifdef INET6 438 struct ip6_hdr *ip6, *ip6o; 439 #endif /* INET6 */ 440 441 IPSEC_SPLASSERT_SOFTNET("ipip_output"); 442 443 sav = isr->sav; 444 IPSEC_ASSERT(sav != NULL, ("ipip_output: null SA")); 445 IPSEC_ASSERT(sav->sah != NULL, ("ipip_output: null SAH")); 446 447 /* XXX Deal with empty TDB source/destination addresses. */ 448 449 m_copydata(m, 0, 1, &tp); 450 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 451 452 saidx = &sav->sah->saidx; 453 switch (saidx->dst.sa.sa_family) { 454 #ifdef INET 455 case AF_INET: 456 if (saidx->src.sa.sa_family != AF_INET || 457 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 458 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 459 DPRINTF(("ipip_output: unspecified tunnel endpoint " 460 "address in SA %s/%08lx\n", 461 ipsec_address(&saidx->dst), 462 (u_long) ntohl(sav->spi))); 463 IPIP_STATINC(IPIP_STAT_UNSPEC); 464 error = EINVAL; 465 goto bad; 466 } 467 468 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 469 if (m == 0) { 470 DPRINTF(("ipip_output: M_PREPEND failed\n")); 471 IPIP_STATINC(IPIP_STAT_HDROPS); 472 error = ENOBUFS; 473 goto bad; 474 } 475 476 ipo = mtod(m, struct ip *); 477 478 ipo->ip_v = IPVERSION; 479 ipo->ip_hl = 5; 480 ipo->ip_len = htons(m->m_pkthdr.len); 481 ipo->ip_ttl = ip_defttl; 482 ipo->ip_sum = 0; 483 ipo->ip_src = saidx->src.sin.sin_addr; 484 ipo->ip_dst = saidx->dst.sin.sin_addr; 485 486 #if defined(__NetBSD__) 487 ipo->ip_id = ip_newid(NULL); 488 #elif defined(RANDOM_IP_ID) 489 ipo->ip_id = ip_randomid(); 490 #else 491 ipo->ip_id = htons(ip_id++); 492 #endif 493 494 /* If the inner protocol is IP... */ 495 if (tp == IPVERSION) { 496 /* Save ECN notification */ 497 m_copydata(m, sizeof(struct ip) + 498 offsetof(struct ip, ip_tos), 499 sizeof(u_int8_t), &itos); 500 501 ipo->ip_p = IPPROTO_IPIP; 502 503 /* 504 * We should be keeping tunnel soft-state and 505 * send back ICMPs if needed. 506 */ 507 m_copydata(m, sizeof(struct ip) + 508 offsetof(struct ip, ip_off), 509 sizeof(u_int16_t), &ipo->ip_off); 510 ipo->ip_off &= ~ IP_OFF_CONVERT(IP_DF | IP_MF | IP_OFFMASK); 511 } 512 #ifdef INET6 513 else if (tp == (IPV6_VERSION >> 4)) { 514 u_int32_t itos32; 515 516 /* Save ECN notification. */ 517 m_copydata(m, sizeof(struct ip) + 518 offsetof(struct ip6_hdr, ip6_flow), 519 sizeof(u_int32_t), &itos32); 520 itos = ntohl(itos32) >> 20; 521 ipo->ip_p = IPPROTO_IPV6; 522 ipo->ip_off = 0; 523 } 524 #endif /* INET6 */ 525 else { 526 goto nofamily; 527 } 528 529 otos = 0; 530 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 531 ipo->ip_tos = otos; 532 break; 533 #endif /* INET */ 534 535 #ifdef INET6 536 case AF_INET6: 537 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 538 saidx->src.sa.sa_family != AF_INET6 || 539 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 540 DPRINTF(("ipip_output: unspecified tunnel endpoint " 541 "address in SA %s/%08lx\n", 542 ipsec_address(&saidx->dst), 543 (u_long) ntohl(sav->spi))); 544 IPIP_STATINC(IPIP_STAT_UNSPEC); 545 error = ENOBUFS; 546 goto bad; 547 } 548 549 if (tp == (IPV6_VERSION >> 4)) { 550 /* scoped address handling */ 551 ip6 = mtod(m, struct ip6_hdr *); 552 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 553 ip6->ip6_src.s6_addr16[1] = 0; 554 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 555 ip6->ip6_dst.s6_addr16[1] = 0; 556 } 557 558 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 559 if (m == 0) { 560 DPRINTF(("ipip_output: M_PREPEND failed\n")); 561 IPIP_STATINC(IPIP_STAT_HDROPS); 562 error = ENOBUFS; 563 goto bad; 564 } 565 566 /* Initialize IPv6 header */ 567 ip6o = mtod(m, struct ip6_hdr *); 568 ip6o->ip6_flow = 0; 569 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 570 ip6o->ip6_vfc |= IPV6_VERSION; 571 ip6o->ip6_plen = htons(m->m_pkthdr.len); 572 ip6o->ip6_hlim = ip_defttl; 573 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 574 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 575 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_dst)) 576 ip6o->ip6_dst.s6_addr16[1] = htons(saidx->dst.sin6.sin6_scope_id); 577 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_src)) 578 ip6o->ip6_src.s6_addr16[1] = htons(saidx->src.sin6.sin6_scope_id); 579 580 #ifdef INET 581 if (tp == IPVERSION) { 582 /* Save ECN notification */ 583 m_copydata(m, sizeof(struct ip6_hdr) + 584 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 585 &itos); 586 587 /* This is really IPVERSION. */ 588 ip6o->ip6_nxt = IPPROTO_IPIP; 589 } else 590 #endif /* INET */ 591 if (tp == (IPV6_VERSION >> 4)) { 592 u_int32_t itos32; 593 594 /* Save ECN notification. */ 595 m_copydata(m, sizeof(struct ip6_hdr) + 596 offsetof(struct ip6_hdr, ip6_flow), 597 sizeof(u_int32_t), &itos32); 598 itos = ntohl(itos32) >> 20; 599 600 ip6o->ip6_nxt = IPPROTO_IPV6; 601 } else { 602 goto nofamily; 603 } 604 605 otos = 0; 606 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 607 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 608 break; 609 #endif /* INET6 */ 610 611 default: 612 nofamily: 613 DPRINTF(("ipip_output: unsupported protocol family %u\n", 614 saidx->dst.sa.sa_family)); 615 IPIP_STATINC(IPIP_STAT_FAMILY); 616 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 617 goto bad; 618 } 619 620 IPIP_STATINC(IPIP_STAT_OPACKETS); 621 *mp = m; 622 623 #ifdef INET 624 if (saidx->dst.sa.sa_family == AF_INET) { 625 #if 0 626 if (sav->tdb_xform->xf_type == XF_IP4) 627 tdb->tdb_cur_bytes += 628 m->m_pkthdr.len - sizeof(struct ip); 629 #endif 630 IPIP_STATADD(IPIP_STAT_OBYTES, 631 m->m_pkthdr.len - sizeof(struct ip)); 632 } 633 #endif /* INET */ 634 635 #ifdef INET6 636 if (saidx->dst.sa.sa_family == AF_INET6) { 637 #if 0 638 if (sav->tdb_xform->xf_type == XF_IP4) 639 tdb->tdb_cur_bytes += 640 m->m_pkthdr.len - sizeof(struct ip6_hdr); 641 #endif 642 IPIP_STATADD(IPIP_STAT_OBYTES, 643 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 644 } 645 #endif /* INET6 */ 646 647 return 0; 648 bad: 649 if (m) 650 m_freem(m); 651 *mp = NULL; 652 return (error); 653 } 654 655 #ifdef FAST_IPSEC 656 static int 657 ipe4_init(struct secasvar *sav, const struct xformsw *xsp) 658 { 659 sav->tdb_xform = xsp; 660 return 0; 661 } 662 663 static int 664 ipe4_zeroize(struct secasvar *sav) 665 { 666 sav->tdb_xform = NULL; 667 return 0; 668 } 669 670 static int 671 ipe4_input( 672 struct mbuf *m, 673 const struct secasvar *sav, 674 int skip, 675 int protoff 676 ) 677 { 678 /* This is a rather serious mistake, so no conditional printing. */ 679 printf("ipe4_input: should never be called\n"); 680 if (m) 681 m_freem(m); 682 return EOPNOTSUPP; 683 } 684 685 static struct xformsw ipe4_xformsw = { 686 XF_IP4, 0, "IPv4 Simple Encapsulation", 687 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 688 NULL, 689 }; 690 691 #ifdef INET 692 PR_WRAP_CTLOUTPUT(rip_ctloutput) 693 PR_WRAP_USRREQ(rip_usrreq) 694 #define rip_ctloutput rip_ctloutput_wrapper 695 #define rip_usrreq rip_usrreq_wrapper 696 697 extern struct domain inetdomain; 698 static struct ipprotosw ipe4_protosw = { 699 .pr_type = SOCK_RAW, 700 .pr_domain = &inetdomain, 701 .pr_protocol = IPPROTO_IPV4, 702 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 703 .pr_input = ip4_input, 704 .pr_output = 0, 705 .pr_ctlinput = 0, 706 .pr_ctloutput = rip_ctloutput, 707 .pr_usrreq = rip_usrreq, 708 .pr_init = 0, 709 .pr_fasttimo = 0, 710 .pr_slowtimo = 0, 711 .pr_drain = 0, 712 }; 713 #endif 714 #ifdef INET6 715 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 716 PR_WRAP_USRREQ(rip6_usrreq) 717 #define rip6_ctloutput rip6_ctloutput_wrapper 718 #define rip6_usrreq rip6_usrreq_wrapper 719 720 extern struct domain inet6domain; 721 static struct ip6protosw ipe4_protosw6 = { 722 .pr_type = SOCK_RAW, 723 .pr_domain = &inet6domain, 724 .pr_protocol = IPPROTO_IPV6, 725 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 726 .pr_input = ip4_input6, 727 .pr_output = 0, 728 .pr_ctlinput = 0, 729 .pr_ctloutput = rip6_ctloutput, 730 .pr_usrreq = rip6_usrreq, 731 .pr_init = 0, 732 .pr_fasttimo = 0, 733 .pr_slowtimo = 0, 734 .pr_drain = 0, 735 }; 736 #endif 737 738 #endif /* FAST_IPSEC */ 739 740 /* 741 * Check the encapsulated packet to see if we want it 742 */ 743 static int 744 ipe4_encapcheck(struct mbuf *m, 745 int off, 746 int proto, 747 void *arg 748 ) 749 { 750 /* 751 * Only take packets coming from IPSEC tunnels; the rest 752 * must be handled by the gif tunnel code. Note that we 753 * also return a minimum priority when we want the packet 754 * so any explicit gif tunnels take precedence. 755 */ 756 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 757 } 758 759 INITFN void 760 ipe4_attach(void) 761 { 762 763 ipipstat_percpu = percpu_alloc(sizeof(uint64_t) * IPIP_NSTATS); 764 765 xform_register(&ipe4_xformsw); 766 /* attach to encapsulation framework */ 767 /* XXX save return cookie for detach on module remove */ 768 #ifdef INET 769 (void) encap_attach_func(AF_INET, -1, 770 ipe4_encapcheck, (struct protosw*) &ipe4_protosw, NULL); 771 #endif 772 #ifdef INET6 773 (void) encap_attach_func(AF_INET6, -1, 774 ipe4_encapcheck, (struct protosw*) &ipe4_protosw6, NULL); 775 #endif 776 } 777 778 #ifdef SYSINIT 779 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 780 #endif 781 782