1 /* $NetBSD: xform_ipip.c,v 1.24 2008/04/27 12:58:48 degroote 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 1.24 2008/04/27 12:58:48 degroote 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 u_int8_t nxt; 207 int isr; 208 u_int8_t otos; 209 u_int8_t v; 210 int hlen; 211 212 IPIP_STATINC(IPIP_STAT_IPACKETS); 213 214 m_copydata(m, 0, 1, &v); 215 216 switch (v >> 4) { 217 #ifdef INET 218 case 4: 219 hlen = sizeof(struct ip); 220 break; 221 #endif /* INET */ 222 #ifdef INET6 223 case 6: 224 hlen = sizeof(struct ip6_hdr); 225 break; 226 #endif 227 default: 228 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 229 "for outer header\n", v, v>>4)); 230 IPIP_STATINC(IPIP_STAT_FAMILY); 231 m_freem(m); 232 return /* EAFNOSUPPORT */; 233 } 234 235 /* Bring the IP header in the first mbuf, if not there already */ 236 if (m->m_len < hlen) { 237 if ((m = m_pullup(m, hlen)) == NULL) { 238 DPRINTF(("ipip_input: m_pullup (1) failed\n")); 239 IPIP_STATINC(IPIP_STAT_HDROPS); 240 return; 241 } 242 } 243 244 ipo = mtod(m, struct ip *); 245 246 #ifdef MROUTING 247 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 248 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 249 ipip_mroute_input (m, iphlen); 250 return; 251 } 252 } 253 #endif /* MROUTING */ 254 255 /* Keep outer ecn field. */ 256 switch (v >> 4) { 257 #ifdef INET 258 case 4: 259 otos = ipo->ip_tos; 260 break; 261 #endif /* INET */ 262 #ifdef INET6 263 case 6: 264 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 265 break; 266 #endif 267 default: 268 panic("ipip_input: unknown ip version %u (outer)", v>>4); 269 } 270 271 /* Remove outer IP header */ 272 m_adj(m, iphlen); 273 274 /* Sanity check */ 275 if (m->m_pkthdr.len < sizeof(struct ip)) { 276 IPIP_STATINC(IPIP_STAT_HDROPS); 277 m_freem(m); 278 return; 279 } 280 281 m_copydata(m, 0, 1, &v); 282 283 switch (v >> 4) { 284 #ifdef INET 285 case 4: 286 hlen = sizeof(struct ip); 287 break; 288 #endif /* INET */ 289 290 #ifdef INET6 291 case 6: 292 hlen = sizeof(struct ip6_hdr); 293 break; 294 #endif 295 default: 296 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 297 "for inner header\n", v, v>>4)); 298 IPIP_STATINC(IPIP_STAT_FAMILY); 299 m_freem(m); 300 return; /* EAFNOSUPPORT */ 301 } 302 303 /* 304 * Bring the inner IP header in the first mbuf, if not there already. 305 */ 306 if (m->m_len < hlen) { 307 if ((m = m_pullup(m, hlen)) == NULL) { 308 DPRINTF(("ipip_input: m_pullup (2) failed\n")); 309 IPIP_STATINC(IPIP_STAT_HDROPS); 310 return; 311 } 312 } 313 314 /* 315 * RFC 1853 specifies that the inner TTL should not be touched on 316 * decapsulation. There's no reason this comment should be here, but 317 * this is as good as any a position. 318 */ 319 320 /* Some sanity checks in the inner IP header */ 321 switch (v >> 4) { 322 #ifdef INET 323 case 4: 324 ipo = mtod(m, struct ip *); 325 nxt = ipo->ip_p; 326 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 327 break; 328 #endif /* INET */ 329 #ifdef INET6 330 case 6: 331 ip6 = (struct ip6_hdr *) ipo; 332 nxt = ip6->ip6_nxt; 333 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 334 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 335 ip6->ip6_flow &= ~htonl(0xff << 20); 336 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 337 break; 338 #endif 339 default: 340 panic("ipip_input: unknown ip version %u (inner)", v>>4); 341 } 342 343 /* Check for local address spoofing. */ 344 if ((m->m_pkthdr.rcvif == NULL || 345 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 346 ipip_allow != 2) { 347 IFNET_FOREACH(ifp) { 348 IFADDR_FOREACH(ifa, ifp) { 349 #ifdef INET 350 if (ipo) { 351 if (ifa->ifa_addr->sa_family != 352 AF_INET) 353 continue; 354 355 sin = (struct sockaddr_in *) ifa->ifa_addr; 356 357 if (sin->sin_addr.s_addr == 358 ipo->ip_src.s_addr) { 359 IPIP_STATINC(IPIP_STAT_SPOOF); 360 m_freem(m); 361 return; 362 } 363 } 364 #endif /* INET */ 365 366 #ifdef INET6 367 if (ip6) { 368 if (ifa->ifa_addr->sa_family != 369 AF_INET6) 370 continue; 371 372 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 373 374 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 375 IPIP_STATINC(IPIP_STAT_SPOOF); 376 m_freem(m); 377 return; 378 } 379 380 } 381 #endif /* INET6 */ 382 } 383 } 384 } 385 386 /* Statistics */ 387 IPIP_STATADD(IPIP_STAT_IBYTES, m->m_pkthdr.len - iphlen); 388 389 /* 390 * Interface pointer stays the same; if no IPsec processing has 391 * been done (or will be done), this will point to a normal 392 * interface. Otherwise, it'll point to an enc interface, which 393 * will allow a packet filter to distinguish between secure and 394 * untrusted packets. 395 */ 396 397 switch (v >> 4) { 398 #ifdef INET 399 case 4: 400 ifq = &ipintrq; 401 isr = NETISR_IP; 402 break; 403 #endif 404 #ifdef INET6 405 case 6: 406 ifq = &ip6intrq; 407 isr = NETISR_IPV6; 408 break; 409 #endif 410 default: 411 panic("ipip_input: should never reach here"); 412 } 413 414 if (!IF_HANDOFF(ifq, m, NULL)) { 415 IPIP_STATINC(IPIP_STAT_QFULL); 416 417 DPRINTF(("ipip_input: packet dropped because of full queue\n")); 418 } else { 419 schednetisr(isr); 420 } 421 } 422 423 int 424 ipip_output( 425 struct mbuf *m, 426 struct ipsecrequest *isr, 427 struct mbuf **mp, 428 int skip, 429 int protoff 430 ) 431 { 432 struct secasvar *sav; 433 u_int8_t tp, otos; 434 struct secasindex *saidx; 435 int error; 436 #ifdef INET 437 u_int8_t itos; 438 struct ip *ipo; 439 #endif /* INET */ 440 #ifdef INET6 441 struct ip6_hdr *ip6, *ip6o; 442 #endif /* INET6 */ 443 444 IPSEC_SPLASSERT_SOFTNET("ipip_output"); 445 446 sav = isr->sav; 447 IPSEC_ASSERT(sav != NULL, ("ipip_output: null SA")); 448 IPSEC_ASSERT(sav->sah != NULL, ("ipip_output: null SAH")); 449 450 /* XXX Deal with empty TDB source/destination addresses. */ 451 452 m_copydata(m, 0, 1, &tp); 453 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 454 455 saidx = &sav->sah->saidx; 456 switch (saidx->dst.sa.sa_family) { 457 #ifdef INET 458 case AF_INET: 459 if (saidx->src.sa.sa_family != AF_INET || 460 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 461 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 462 DPRINTF(("ipip_output: unspecified tunnel endpoint " 463 "address in SA %s/%08lx\n", 464 ipsec_address(&saidx->dst), 465 (u_long) ntohl(sav->spi))); 466 IPIP_STATINC(IPIP_STAT_UNSPEC); 467 error = EINVAL; 468 goto bad; 469 } 470 471 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 472 if (m == 0) { 473 DPRINTF(("ipip_output: M_PREPEND failed\n")); 474 IPIP_STATINC(IPIP_STAT_HDROPS); 475 error = ENOBUFS; 476 goto bad; 477 } 478 479 ipo = mtod(m, struct ip *); 480 481 ipo->ip_v = IPVERSION; 482 ipo->ip_hl = 5; 483 ipo->ip_len = htons(m->m_pkthdr.len); 484 ipo->ip_ttl = ip_defttl; 485 ipo->ip_sum = 0; 486 ipo->ip_src = saidx->src.sin.sin_addr; 487 ipo->ip_dst = saidx->dst.sin.sin_addr; 488 489 #if defined(__NetBSD__) 490 ipo->ip_id = ip_newid(NULL); 491 #elif defined(RANDOM_IP_ID) 492 ipo->ip_id = ip_randomid(); 493 #else 494 ipo->ip_id = htons(ip_id++); 495 #endif 496 497 /* If the inner protocol is IP... */ 498 if (tp == IPVERSION) { 499 /* Save ECN notification */ 500 m_copydata(m, sizeof(struct ip) + 501 offsetof(struct ip, ip_tos), 502 sizeof(u_int8_t), &itos); 503 504 ipo->ip_p = IPPROTO_IPIP; 505 506 /* 507 * We should be keeping tunnel soft-state and 508 * send back ICMPs if needed. 509 */ 510 m_copydata(m, sizeof(struct ip) + 511 offsetof(struct ip, ip_off), 512 sizeof(u_int16_t), &ipo->ip_off); 513 ipo->ip_off &= ~ IP_OFF_CONVERT(IP_DF | IP_MF | IP_OFFMASK); 514 } 515 #ifdef INET6 516 else if (tp == (IPV6_VERSION >> 4)) { 517 u_int32_t itos32; 518 519 /* Save ECN notification. */ 520 m_copydata(m, sizeof(struct ip) + 521 offsetof(struct ip6_hdr, ip6_flow), 522 sizeof(u_int32_t), &itos32); 523 itos = ntohl(itos32) >> 20; 524 ipo->ip_p = IPPROTO_IPV6; 525 ipo->ip_off = 0; 526 } 527 #endif /* INET6 */ 528 else { 529 goto nofamily; 530 } 531 532 otos = 0; 533 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 534 ipo->ip_tos = otos; 535 break; 536 #endif /* INET */ 537 538 #ifdef INET6 539 case AF_INET6: 540 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 541 saidx->src.sa.sa_family != AF_INET6 || 542 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 543 DPRINTF(("ipip_output: unspecified tunnel endpoint " 544 "address in SA %s/%08lx\n", 545 ipsec_address(&saidx->dst), 546 (u_long) ntohl(sav->spi))); 547 IPIP_STATINC(IPIP_STAT_UNSPEC); 548 error = ENOBUFS; 549 goto bad; 550 } 551 552 /* scoped address handling */ 553 ip6 = mtod(m, struct ip6_hdr *); 554 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 555 ip6->ip6_src.s6_addr16[1] = 0; 556 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 557 ip6->ip6_dst.s6_addr16[1] = 0; 558 559 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 560 if (m == 0) { 561 DPRINTF(("ipip_output: M_PREPEND failed\n")); 562 IPIP_STATINC(IPIP_STAT_HDROPS); 563 error = ENOBUFS; 564 goto bad; 565 } 566 567 /* Initialize IPv6 header */ 568 ip6o = mtod(m, struct ip6_hdr *); 569 ip6o->ip6_flow = 0; 570 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 571 ip6o->ip6_vfc |= IPV6_VERSION; 572 ip6o->ip6_plen = htons(m->m_pkthdr.len); 573 ip6o->ip6_hlim = ip_defttl; 574 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 575 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 576 577 #ifdef INET 578 if (tp == IPVERSION) { 579 /* Save ECN notification */ 580 m_copydata(m, sizeof(struct ip6_hdr) + 581 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 582 &itos); 583 584 /* This is really IPVERSION. */ 585 ip6o->ip6_nxt = IPPROTO_IPIP; 586 } else 587 #endif /* INET */ 588 if (tp == (IPV6_VERSION >> 4)) { 589 u_int32_t itos32; 590 591 /* Save ECN notification. */ 592 m_copydata(m, sizeof(struct ip6_hdr) + 593 offsetof(struct ip6_hdr, ip6_flow), 594 sizeof(u_int32_t), &itos32); 595 itos = ntohl(itos32) >> 20; 596 597 ip6o->ip6_nxt = IPPROTO_IPV6; 598 } else { 599 goto nofamily; 600 } 601 602 otos = 0; 603 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 604 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 605 break; 606 #endif /* INET6 */ 607 608 default: 609 nofamily: 610 DPRINTF(("ipip_output: unsupported protocol family %u\n", 611 saidx->dst.sa.sa_family)); 612 IPIP_STATINC(IPIP_STAT_FAMILY); 613 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 614 goto bad; 615 } 616 617 IPIP_STATINC(IPIP_STAT_OPACKETS); 618 *mp = m; 619 620 #ifdef INET 621 if (saidx->dst.sa.sa_family == AF_INET) { 622 #if 0 623 if (sav->tdb_xform->xf_type == XF_IP4) 624 tdb->tdb_cur_bytes += 625 m->m_pkthdr.len - sizeof(struct ip); 626 #endif 627 IPIP_STATADD(IPIP_STAT_OBYTES, 628 m->m_pkthdr.len - sizeof(struct ip)); 629 } 630 #endif /* INET */ 631 632 #ifdef INET6 633 if (saidx->dst.sa.sa_family == AF_INET6) { 634 #if 0 635 if (sav->tdb_xform->xf_type == XF_IP4) 636 tdb->tdb_cur_bytes += 637 m->m_pkthdr.len - sizeof(struct ip6_hdr); 638 #endif 639 IPIP_STATADD(IPIP_STAT_IBYTES, 640 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 641 } 642 #endif /* INET6 */ 643 644 return 0; 645 bad: 646 if (m) 647 m_freem(m); 648 *mp = NULL; 649 return (error); 650 } 651 652 #ifdef FAST_IPSEC 653 static int 654 ipe4_init(struct secasvar *sav, struct xformsw *xsp) 655 { 656 sav->tdb_xform = xsp; 657 return 0; 658 } 659 660 static int 661 ipe4_zeroize(struct secasvar *sav) 662 { 663 sav->tdb_xform = NULL; 664 return 0; 665 } 666 667 static int 668 ipe4_input( 669 struct mbuf *m, 670 struct secasvar *sav, 671 int skip, 672 int protoff 673 ) 674 { 675 /* This is a rather serious mistake, so no conditional printing. */ 676 printf("ipe4_input: should never be called\n"); 677 if (m) 678 m_freem(m); 679 return EOPNOTSUPP; 680 } 681 682 static struct xformsw ipe4_xformsw = { 683 XF_IP4, 0, "IPv4 Simple Encapsulation", 684 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 685 NULL, 686 }; 687 688 #ifdef INET 689 PR_WRAP_CTLOUTPUT(rip_ctloutput) 690 PR_WRAP_USRREQ(rip_usrreq) 691 #define rip_ctloutput rip_ctloutput_wrapper 692 #define rip_usrreq rip_usrreq_wrapper 693 694 extern struct domain inetdomain; 695 static struct ipprotosw ipe4_protosw = { 696 .pr_type = SOCK_RAW, 697 .pr_domain = &inetdomain, 698 .pr_protocol = IPPROTO_IPV4, 699 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 700 .pr_input = ip4_input, 701 .pr_output = 0, 702 .pr_ctlinput = 0, 703 .pr_ctloutput = rip_ctloutput, 704 .pr_usrreq = rip_usrreq, 705 .pr_init = 0, 706 .pr_fasttimo = 0, 707 .pr_slowtimo = 0, 708 .pr_drain = 0, 709 }; 710 #endif 711 #ifdef INET6 712 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 713 PR_WRAP_USRREQ(rip6_usrreq) 714 #define rip6_ctloutput rip6_ctloutput_wrapper 715 #define rip6_usrreq rip6_usrreq_wrapper 716 717 extern struct domain inet6domain; 718 static struct ip6protosw ipe4_protosw6 = { 719 .pr_type = SOCK_RAW, 720 .pr_domain = &inet6domain, 721 .pr_protocol = IPPROTO_IPV6, 722 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 723 .pr_input = ip4_input6, 724 .pr_output = 0, 725 .pr_ctlinput = 0, 726 .pr_ctloutput = rip6_ctloutput, 727 .pr_usrreq = rip6_usrreq, 728 .pr_init = 0, 729 .pr_fasttimo = 0, 730 .pr_slowtimo = 0, 731 .pr_drain = 0, 732 }; 733 #endif 734 735 #endif /* FAST_IPSEC */ 736 737 /* 738 * Check the encapsulated packet to see if we want it 739 */ 740 static int 741 ipe4_encapcheck(struct mbuf *m, 742 int off, 743 int proto, 744 void *arg 745 ) 746 { 747 /* 748 * Only take packets coming from IPSEC tunnels; the rest 749 * must be handled by the gif tunnel code. Note that we 750 * also return a minimum priority when we want the packet 751 * so any explicit gif tunnels take precedence. 752 */ 753 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 754 } 755 756 INITFN void 757 ipe4_attach(void) 758 { 759 760 ipipstat_percpu = percpu_alloc(sizeof(uint64_t) * IPIP_NSTATS); 761 762 xform_register(&ipe4_xformsw); 763 /* attach to encapsulation framework */ 764 /* XXX save return cookie for detach on module remove */ 765 #ifdef INET 766 (void) encap_attach_func(AF_INET, -1, 767 ipe4_encapcheck, (struct protosw*) &ipe4_protosw, NULL); 768 #endif 769 #ifdef INET6 770 (void) encap_attach_func(AF_INET6, -1, 771 ipe4_encapcheck, (struct protosw*) &ipe4_protosw6, NULL); 772 #endif 773 } 774 775 #ifdef SYSINIT 776 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 777 #endif 778 779