1 /* $NetBSD: xform_ipip.c,v 1.32 2015/03/27 07:47:10 ozaki-r 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 1.32 2015/03/27 07:47:10 ozaki-r 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 #ifdef __FreeBSD__ 102 typedef void pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */ 103 #else 104 typedef void pr_in_input_t (struct mbuf *m, ...); 105 #endif 106 107 /* 108 * We can control the acceptance of IP4 packets by altering the sysctl 109 * net.inet.ipip.allow value. Zero means drop them, all else is acceptance. 110 */ 111 int ipip_allow = 0; 112 113 percpu_t *ipipstat_percpu; 114 115 #ifdef SYSCTL_DECL 116 SYSCTL_DECL(_net_inet_ipip); 117 118 SYSCTL_INT(_net_inet_ipip, OID_AUTO, 119 ipip_allow, CTLFLAG_RW, &ipip_allow, 0, ""); 120 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS, 121 stats, CTLFLAG_RD, &ipipstat, ipipstat, ""); 122 123 #endif 124 125 #ifdef __FreeBSD__ 126 static 127 #endif 128 void ipe4_attach(void); 129 130 131 /* XXX IPCOMP */ 132 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED) 133 134 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp); 135 136 #ifdef INET6 137 /* 138 * Really only a wrapper for ipip_input(), for use with IPv6. 139 */ 140 int 141 ip4_input6(struct mbuf **m, int *offp, int proto) 142 { 143 #if 0 144 /* If we do not accept IP-in-IP explicitly, drop. */ 145 if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) { 146 DPRINTF(("ip4_input6: dropped due to policy\n")); 147 IPIP_STATINC(IPIP_STAT_PDROPS); 148 m_freem(*m); 149 return IPPROTO_DONE; 150 } 151 #endif 152 _ipip_input(*m, *offp, NULL); 153 return IPPROTO_DONE; 154 } 155 #endif /* INET6 */ 156 157 #ifdef INET 158 /* 159 * Really only a wrapper for ipip_input(), for use with IPv4. 160 */ 161 void 162 ip4_input(struct mbuf *m, ...) 163 { 164 va_list ap; 165 int iphlen; 166 167 #if 0 168 /* If we do not accept IP-in-IP explicitly, drop. */ 169 if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { 170 DPRINTF(("ip4_input: dropped due to policy\n")); 171 IPIP_STATINC(IPIP_STAT_PDROPS); 172 m_freem(m); 173 return; 174 } 175 #endif 176 va_start(ap, m); 177 iphlen = va_arg(ap, int); 178 va_end(ap); 179 180 _ipip_input(m, iphlen, NULL); 181 } 182 #endif /* INET */ 183 184 /* 185 * ipip_input gets called when we receive an IP{46} encapsulated packet, 186 * either because we got it at a real interface, or because AH or ESP 187 * were being used in tunnel mode (in which case the rcvif element will 188 * contain the address of the encX interface associated with the tunnel. 189 */ 190 191 static void 192 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) 193 { 194 register struct sockaddr_in *sin; 195 register struct ifnet *ifp; 196 register struct ifaddr *ifa; 197 pktqueue_t *pktq = NULL; 198 struct ip *ipo; 199 #ifdef INET6 200 register struct sockaddr_in6 *sin6; 201 struct ip6_hdr *ip6 = NULL; 202 u_int8_t itos; 203 #endif 204 u_int8_t otos; 205 u_int8_t v; 206 int hlen; 207 208 IPIP_STATINC(IPIP_STAT_IPACKETS); 209 210 m_copydata(m, 0, 1, &v); 211 212 switch (v >> 4) { 213 #ifdef INET 214 case 4: 215 hlen = sizeof(struct ip); 216 break; 217 #endif /* INET */ 218 #ifdef INET6 219 case 6: 220 hlen = sizeof(struct ip6_hdr); 221 break; 222 #endif 223 default: 224 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 225 "for outer header\n", v, v>>4)); 226 IPIP_STATINC(IPIP_STAT_FAMILY); 227 m_freem(m); 228 return /* EAFNOSUPPORT */; 229 } 230 231 /* Bring the IP header in the first mbuf, if not there already */ 232 if (m->m_len < hlen) { 233 if ((m = m_pullup(m, hlen)) == NULL) { 234 DPRINTF(("ipip_input: m_pullup (1) failed\n")); 235 IPIP_STATINC(IPIP_STAT_HDROPS); 236 return; 237 } 238 } 239 240 ipo = mtod(m, struct ip *); 241 242 #ifdef MROUTING 243 if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { 244 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { 245 ipip_mroute_input (m, iphlen); 246 return; 247 } 248 } 249 #endif /* MROUTING */ 250 251 /* Keep outer ecn field. */ 252 switch (v >> 4) { 253 #ifdef INET 254 case 4: 255 otos = ipo->ip_tos; 256 break; 257 #endif /* INET */ 258 #ifdef INET6 259 case 6: 260 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; 261 break; 262 #endif 263 default: 264 panic("ipip_input: unknown ip version %u (outer)", v>>4); 265 } 266 267 /* Remove outer IP header */ 268 m_adj(m, iphlen); 269 270 /* Sanity check */ 271 if (m->m_pkthdr.len < sizeof(struct ip)) { 272 IPIP_STATINC(IPIP_STAT_HDROPS); 273 m_freem(m); 274 return; 275 } 276 277 m_copydata(m, 0, 1, &v); 278 279 switch (v >> 4) { 280 #ifdef INET 281 case 4: 282 hlen = sizeof(struct ip); 283 break; 284 #endif /* INET */ 285 286 #ifdef INET6 287 case 6: 288 hlen = sizeof(struct ip6_hdr); 289 break; 290 #endif 291 default: 292 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " 293 "for inner header\n", v, v>>4)); 294 IPIP_STATINC(IPIP_STAT_FAMILY); 295 m_freem(m); 296 return; /* EAFNOSUPPORT */ 297 } 298 299 /* 300 * Bring the inner IP header in the first mbuf, if not there already. 301 */ 302 if (m->m_len < hlen) { 303 if ((m = m_pullup(m, hlen)) == NULL) { 304 DPRINTF(("ipip_input: m_pullup (2) failed\n")); 305 IPIP_STATINC(IPIP_STAT_HDROPS); 306 return; 307 } 308 } 309 310 /* 311 * RFC 1853 specifies that the inner TTL should not be touched on 312 * decapsulation. There's no reason this comment should be here, but 313 * this is as good as any a position. 314 */ 315 316 /* Some sanity checks in the inner IP header */ 317 switch (v >> 4) { 318 #ifdef INET 319 case 4: 320 ipo = mtod(m, struct ip *); 321 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); 322 break; 323 #endif /* INET */ 324 #ifdef INET6 325 case 6: 326 ip6 = (struct ip6_hdr *) ipo; 327 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 328 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); 329 ip6->ip6_flow &= ~htonl(0xff << 20); 330 ip6->ip6_flow |= htonl((u_int32_t) itos << 20); 331 break; 332 #endif 333 default: 334 panic("ipip_input: unknown ip version %u (inner)", v>>4); 335 } 336 337 /* Check for local address spoofing. */ 338 if ((m->m_pkthdr.rcvif == NULL || 339 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) && 340 ipip_allow != 2) { 341 IFNET_FOREACH(ifp) { 342 IFADDR_FOREACH(ifa, ifp) { 343 #ifdef INET 344 if (ipo) { 345 if (ifa->ifa_addr->sa_family != 346 AF_INET) 347 continue; 348 349 sin = (struct sockaddr_in *) ifa->ifa_addr; 350 351 if (sin->sin_addr.s_addr == 352 ipo->ip_src.s_addr) { 353 IPIP_STATINC(IPIP_STAT_SPOOF); 354 m_freem(m); 355 return; 356 } 357 } 358 #endif /* INET */ 359 360 #ifdef INET6 361 if (ip6) { 362 if (ifa->ifa_addr->sa_family != 363 AF_INET6) 364 continue; 365 366 sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; 367 368 if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { 369 IPIP_STATINC(IPIP_STAT_SPOOF); 370 m_freem(m); 371 return; 372 } 373 374 } 375 #endif /* INET6 */ 376 } 377 } 378 } 379 380 /* Statistics */ 381 IPIP_STATADD(IPIP_STAT_IBYTES, m->m_pkthdr.len - iphlen); 382 383 /* 384 * Interface pointer stays the same; if no IPsec processing has 385 * been done (or will be done), this will point to a normal 386 * interface. Otherwise, it'll point to an enc interface, which 387 * will allow a packet filter to distinguish between secure and 388 * untrusted packets. 389 */ 390 391 switch (v >> 4) { 392 #ifdef INET 393 case 4: 394 pktq = ip_pktq; 395 break; 396 #endif 397 #ifdef INET6 398 case 6: 399 pktq = ip6_pktq; 400 break; 401 #endif 402 default: 403 panic("ipip_input: should never reach here"); 404 } 405 406 int s = splnet(); 407 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 408 IPIP_STATINC(IPIP_STAT_QFULL); 409 m_freem(m); 410 } 411 splx(s); 412 } 413 414 int 415 ipip_output( 416 struct mbuf *m, 417 struct ipsecrequest *isr, 418 struct mbuf **mp, 419 int skip, 420 int protoff 421 ) 422 { 423 const struct secasvar *sav; 424 u_int8_t tp, otos; 425 struct secasindex *saidx; 426 int error; 427 #ifdef INET 428 u_int8_t itos; 429 struct ip *ipo; 430 #endif /* INET */ 431 #ifdef INET6 432 struct ip6_hdr *ip6, *ip6o; 433 #endif /* INET6 */ 434 435 IPSEC_SPLASSERT_SOFTNET("ipip_output"); 436 437 sav = isr->sav; 438 IPSEC_ASSERT(sav != NULL, ("ipip_output: null SA")); 439 IPSEC_ASSERT(sav->sah != NULL, ("ipip_output: null SAH")); 440 441 /* XXX Deal with empty TDB source/destination addresses. */ 442 443 m_copydata(m, 0, 1, &tp); 444 tp = (tp >> 4) & 0xff; /* Get the IP version number. */ 445 446 saidx = &sav->sah->saidx; 447 switch (saidx->dst.sa.sa_family) { 448 #ifdef INET 449 case AF_INET: 450 if (saidx->src.sa.sa_family != AF_INET || 451 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 452 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { 453 DPRINTF(("ipip_output: unspecified tunnel endpoint " 454 "address in SA %s/%08lx\n", 455 ipsec_address(&saidx->dst), 456 (u_long) ntohl(sav->spi))); 457 IPIP_STATINC(IPIP_STAT_UNSPEC); 458 error = EINVAL; 459 goto bad; 460 } 461 462 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 463 if (m == 0) { 464 DPRINTF(("ipip_output: M_PREPEND failed\n")); 465 IPIP_STATINC(IPIP_STAT_HDROPS); 466 error = ENOBUFS; 467 goto bad; 468 } 469 470 ipo = mtod(m, struct ip *); 471 472 ipo->ip_v = IPVERSION; 473 ipo->ip_hl = 5; 474 ipo->ip_len = htons(m->m_pkthdr.len); 475 ipo->ip_ttl = ip_defttl; 476 ipo->ip_sum = 0; 477 ipo->ip_src = saidx->src.sin.sin_addr; 478 ipo->ip_dst = saidx->dst.sin.sin_addr; 479 480 #if defined(__NetBSD__) 481 ipo->ip_id = ip_newid(NULL); 482 #elif defined(RANDOM_IP_ID) 483 ipo->ip_id = ip_randomid(); 484 #else 485 ipo->ip_id = htons(ip_id++); 486 #endif 487 488 /* If the inner protocol is IP... */ 489 if (tp == IPVERSION) { 490 /* Save ECN notification */ 491 m_copydata(m, sizeof(struct ip) + 492 offsetof(struct ip, ip_tos), 493 sizeof(u_int8_t), &itos); 494 495 ipo->ip_p = IPPROTO_IPIP; 496 497 /* 498 * We should be keeping tunnel soft-state and 499 * send back ICMPs if needed. 500 */ 501 m_copydata(m, sizeof(struct ip) + 502 offsetof(struct ip, ip_off), 503 sizeof(u_int16_t), &ipo->ip_off); 504 ipo->ip_off &= ~ IP_OFF_CONVERT(IP_DF | IP_MF | IP_OFFMASK); 505 } 506 #ifdef INET6 507 else if (tp == (IPV6_VERSION >> 4)) { 508 u_int32_t itos32; 509 510 /* Save ECN notification. */ 511 m_copydata(m, sizeof(struct ip) + 512 offsetof(struct ip6_hdr, ip6_flow), 513 sizeof(u_int32_t), &itos32); 514 itos = ntohl(itos32) >> 20; 515 ipo->ip_p = IPPROTO_IPV6; 516 ipo->ip_off = 0; 517 } 518 #endif /* INET6 */ 519 else { 520 goto nofamily; 521 } 522 523 otos = 0; 524 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 525 ipo->ip_tos = otos; 526 break; 527 #endif /* INET */ 528 529 #ifdef INET6 530 case AF_INET6: 531 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || 532 saidx->src.sa.sa_family != AF_INET6 || 533 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { 534 DPRINTF(("ipip_output: unspecified tunnel endpoint " 535 "address in SA %s/%08lx\n", 536 ipsec_address(&saidx->dst), 537 (u_long) ntohl(sav->spi))); 538 IPIP_STATINC(IPIP_STAT_UNSPEC); 539 error = ENOBUFS; 540 goto bad; 541 } 542 543 if (tp == (IPV6_VERSION >> 4)) { 544 /* scoped address handling */ 545 ip6 = mtod(m, struct ip6_hdr *); 546 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 547 ip6->ip6_src.s6_addr16[1] = 0; 548 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 549 ip6->ip6_dst.s6_addr16[1] = 0; 550 } 551 552 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 553 if (m == 0) { 554 DPRINTF(("ipip_output: M_PREPEND failed\n")); 555 IPIP_STATINC(IPIP_STAT_HDROPS); 556 error = ENOBUFS; 557 goto bad; 558 } 559 560 /* Initialize IPv6 header */ 561 ip6o = mtod(m, struct ip6_hdr *); 562 ip6o->ip6_flow = 0; 563 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; 564 ip6o->ip6_vfc |= IPV6_VERSION; 565 ip6o->ip6_plen = htons(m->m_pkthdr.len); 566 ip6o->ip6_hlim = ip_defttl; 567 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; 568 ip6o->ip6_src = saidx->src.sin6.sin6_addr; 569 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_dst)) 570 ip6o->ip6_dst.s6_addr16[1] = htons(saidx->dst.sin6.sin6_scope_id); 571 if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_src)) 572 ip6o->ip6_src.s6_addr16[1] = htons(saidx->src.sin6.sin6_scope_id); 573 574 #ifdef INET 575 if (tp == IPVERSION) { 576 /* Save ECN notification */ 577 m_copydata(m, sizeof(struct ip6_hdr) + 578 offsetof(struct ip, ip_tos), sizeof(u_int8_t), 579 &itos); 580 581 /* This is really IPVERSION. */ 582 ip6o->ip6_nxt = IPPROTO_IPIP; 583 } else 584 #endif /* INET */ 585 if (tp == (IPV6_VERSION >> 4)) { 586 u_int32_t itos32; 587 588 /* Save ECN notification. */ 589 m_copydata(m, sizeof(struct ip6_hdr) + 590 offsetof(struct ip6_hdr, ip6_flow), 591 sizeof(u_int32_t), &itos32); 592 itos = ntohl(itos32) >> 20; 593 594 ip6o->ip6_nxt = IPPROTO_IPV6; 595 } else { 596 goto nofamily; 597 } 598 599 otos = 0; 600 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 601 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); 602 break; 603 #endif /* INET6 */ 604 605 default: 606 nofamily: 607 DPRINTF(("ipip_output: unsupported protocol family %u\n", 608 saidx->dst.sa.sa_family)); 609 IPIP_STATINC(IPIP_STAT_FAMILY); 610 error = EAFNOSUPPORT; /* XXX diffs from openbsd */ 611 goto bad; 612 } 613 614 IPIP_STATINC(IPIP_STAT_OPACKETS); 615 *mp = m; 616 617 #ifdef INET 618 if (saidx->dst.sa.sa_family == AF_INET) { 619 #if 0 620 if (sav->tdb_xform->xf_type == XF_IP4) 621 tdb->tdb_cur_bytes += 622 m->m_pkthdr.len - sizeof(struct ip); 623 #endif 624 IPIP_STATADD(IPIP_STAT_OBYTES, 625 m->m_pkthdr.len - sizeof(struct ip)); 626 } 627 #endif /* INET */ 628 629 #ifdef INET6 630 if (saidx->dst.sa.sa_family == AF_INET6) { 631 #if 0 632 if (sav->tdb_xform->xf_type == XF_IP4) 633 tdb->tdb_cur_bytes += 634 m->m_pkthdr.len - sizeof(struct ip6_hdr); 635 #endif 636 IPIP_STATADD(IPIP_STAT_OBYTES, 637 m->m_pkthdr.len - sizeof(struct ip6_hdr)); 638 } 639 #endif /* INET6 */ 640 641 return 0; 642 bad: 643 if (m) 644 m_freem(m); 645 *mp = NULL; 646 return (error); 647 } 648 649 static int 650 ipe4_init(struct secasvar *sav, const struct xformsw *xsp) 651 { 652 sav->tdb_xform = xsp; 653 return 0; 654 } 655 656 static int 657 ipe4_zeroize(struct secasvar *sav) 658 { 659 sav->tdb_xform = NULL; 660 return 0; 661 } 662 663 static int 664 ipe4_input( 665 struct mbuf *m, 666 const struct secasvar *sav, 667 int skip, 668 int protoff 669 ) 670 { 671 /* This is a rather serious mistake, so no conditional printing. */ 672 printf("ipe4_input: should never be called\n"); 673 if (m) 674 m_freem(m); 675 return EOPNOTSUPP; 676 } 677 678 static struct xformsw ipe4_xformsw = { 679 XF_IP4, 0, "IPv4 Simple Encapsulation", 680 ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, 681 NULL, 682 }; 683 684 #ifdef INET 685 PR_WRAP_CTLOUTPUT(rip_ctloutput) 686 #define rip_ctloutput rip_ctloutput_wrapper 687 688 extern struct domain inetdomain; 689 static struct ipprotosw ipe4_protosw = { 690 .pr_type = SOCK_RAW, 691 .pr_domain = &inetdomain, 692 .pr_protocol = IPPROTO_IPV4, 693 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 694 .pr_input = ip4_input, 695 .pr_output = 0, 696 .pr_ctlinput = 0, 697 .pr_ctloutput = rip_ctloutput, 698 .pr_usrreqs = &rip_usrreqs, 699 .pr_init = 0, 700 .pr_fasttimo = 0, 701 .pr_slowtimo = 0, 702 .pr_drain = 0, 703 }; 704 #endif 705 #ifdef INET6 706 PR_WRAP_CTLOUTPUT(rip6_ctloutput) 707 #define rip6_ctloutput rip6_ctloutput_wrapper 708 709 extern struct domain inet6domain; 710 static struct ip6protosw ipe4_protosw6 = { 711 .pr_type = SOCK_RAW, 712 .pr_domain = &inet6domain, 713 .pr_protocol = IPPROTO_IPV6, 714 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 715 .pr_input = ip4_input6, 716 .pr_output = 0, 717 .pr_ctlinput = 0, 718 .pr_ctloutput = rip6_ctloutput, 719 .pr_usrreqs = &rip6_usrreqs, 720 .pr_init = 0, 721 .pr_fasttimo = 0, 722 .pr_slowtimo = 0, 723 .pr_drain = 0, 724 }; 725 #endif 726 727 /* 728 * Check the encapsulated packet to see if we want it 729 */ 730 static int 731 ipe4_encapcheck(struct mbuf *m, 732 int off, 733 int proto, 734 void *arg 735 ) 736 { 737 /* 738 * Only take packets coming from IPSEC tunnels; the rest 739 * must be handled by the gif tunnel code. Note that we 740 * also return a minimum priority when we want the packet 741 * so any explicit gif tunnels take precedence. 742 */ 743 return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); 744 } 745 746 INITFN void 747 ipe4_attach(void) 748 { 749 750 ipipstat_percpu = percpu_alloc(sizeof(uint64_t) * IPIP_NSTATS); 751 752 xform_register(&ipe4_xformsw); 753 /* attach to encapsulation framework */ 754 /* XXX save return cookie for detach on module remove */ 755 #ifdef INET 756 (void) encap_attach_func(AF_INET, -1, 757 ipe4_encapcheck, (struct protosw*) &ipe4_protosw, NULL); 758 #endif 759 #ifdef INET6 760 (void) encap_attach_func(AF_INET6, -1, 761 ipe4_encapcheck, (struct protosw*) &ipe4_protosw6, NULL); 762 #endif 763 } 764 765 #ifdef SYSINIT 766 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); 767 #endif 768 769