| 1 | /* $NetBSD: xform_ipip.c,v 1.42 2016/07/07 09:32:03 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 1.42 2016/07/07 09:32:03 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, int off, int proto) |
| 163 | { |
| 164 | |
| 165 | #if 0 |
| 166 | /* If we do not accept IP-in-IP explicitly, drop. */ |
| 167 | if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) { |
| 168 | DPRINTF(("ip4_input: dropped due to policy\n" )); |
| 169 | IPIP_STATINC(IPIP_STAT_PDROPS); |
| 170 | m_freem(m); |
| 171 | return; |
| 172 | } |
| 173 | #endif |
| 174 | |
| 175 | _ipip_input(m, off, NULL); |
| 176 | } |
| 177 | #endif /* INET */ |
| 178 | |
| 179 | /* |
| 180 | * ipip_input gets called when we receive an IP{46} encapsulated packet, |
| 181 | * either because we got it at a real interface, or because AH or ESP |
| 182 | * were being used in tunnel mode (in which case the rcvif element will |
| 183 | * contain the address of the encX interface associated with the tunnel. |
| 184 | */ |
| 185 | |
| 186 | static void |
| 187 | _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp) |
| 188 | { |
| 189 | register struct sockaddr_in *sin; |
| 190 | register struct ifnet *ifp; |
| 191 | register struct ifaddr *ifa; |
| 192 | pktqueue_t *pktq = NULL; |
| 193 | struct ip *ipo; |
| 194 | #ifdef INET6 |
| 195 | register struct sockaddr_in6 *sin6; |
| 196 | struct ip6_hdr *ip6 = NULL; |
| 197 | u_int8_t itos; |
| 198 | #endif |
| 199 | u_int8_t otos; |
| 200 | u_int8_t v; |
| 201 | int hlen; |
| 202 | |
| 203 | IPIP_STATINC(IPIP_STAT_IPACKETS); |
| 204 | |
| 205 | m_copydata(m, 0, 1, &v); |
| 206 | |
| 207 | switch (v >> 4) { |
| 208 | #ifdef INET |
| 209 | case 4: |
| 210 | hlen = sizeof(struct ip); |
| 211 | break; |
| 212 | #endif /* INET */ |
| 213 | #ifdef INET6 |
| 214 | case 6: |
| 215 | hlen = sizeof(struct ip6_hdr); |
| 216 | break; |
| 217 | #endif |
| 218 | default: |
| 219 | DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " |
| 220 | "for outer header\n" , v, v>>4)); |
| 221 | IPIP_STATINC(IPIP_STAT_FAMILY); |
| 222 | m_freem(m); |
| 223 | return /* EAFNOSUPPORT */; |
| 224 | } |
| 225 | |
| 226 | /* Bring the IP header in the first mbuf, if not there already */ |
| 227 | if (m->m_len < hlen) { |
| 228 | if ((m = m_pullup(m, hlen)) == NULL) { |
| 229 | DPRINTF(("ipip_input: m_pullup (1) failed\n" )); |
| 230 | IPIP_STATINC(IPIP_STAT_HDROPS); |
| 231 | return; |
| 232 | } |
| 233 | } |
| 234 | |
| 235 | ipo = mtod(m, struct ip *); |
| 236 | |
| 237 | #ifdef MROUTING |
| 238 | if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) { |
| 239 | if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) { |
| 240 | ipip_mroute_input (m, iphlen); |
| 241 | return; |
| 242 | } |
| 243 | } |
| 244 | #endif /* MROUTING */ |
| 245 | |
| 246 | /* Keep outer ecn field. */ |
| 247 | switch (v >> 4) { |
| 248 | #ifdef INET |
| 249 | case 4: |
| 250 | otos = ipo->ip_tos; |
| 251 | break; |
| 252 | #endif /* INET */ |
| 253 | #ifdef INET6 |
| 254 | case 6: |
| 255 | otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff; |
| 256 | break; |
| 257 | #endif |
| 258 | default: |
| 259 | panic("ipip_input: unknown ip version %u (outer)" , v>>4); |
| 260 | } |
| 261 | |
| 262 | /* Remove outer IP header */ |
| 263 | m_adj(m, iphlen); |
| 264 | |
| 265 | /* Sanity check */ |
| 266 | if (m->m_pkthdr.len < sizeof(struct ip)) { |
| 267 | IPIP_STATINC(IPIP_STAT_HDROPS); |
| 268 | m_freem(m); |
| 269 | return; |
| 270 | } |
| 271 | |
| 272 | m_copydata(m, 0, 1, &v); |
| 273 | |
| 274 | switch (v >> 4) { |
| 275 | #ifdef INET |
| 276 | case 4: |
| 277 | hlen = sizeof(struct ip); |
| 278 | break; |
| 279 | #endif /* INET */ |
| 280 | |
| 281 | #ifdef INET6 |
| 282 | case 6: |
| 283 | hlen = sizeof(struct ip6_hdr); |
| 284 | break; |
| 285 | #endif |
| 286 | default: |
| 287 | DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) " |
| 288 | "for inner header\n" , v, v>>4)); |
| 289 | IPIP_STATINC(IPIP_STAT_FAMILY); |
| 290 | m_freem(m); |
| 291 | return; /* EAFNOSUPPORT */ |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Bring the inner IP header in the first mbuf, if not there already. |
| 296 | */ |
| 297 | if (m->m_len < hlen) { |
| 298 | if ((m = m_pullup(m, hlen)) == NULL) { |
| 299 | DPRINTF(("ipip_input: m_pullup (2) failed\n" )); |
| 300 | IPIP_STATINC(IPIP_STAT_HDROPS); |
| 301 | return; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * RFC 1853 specifies that the inner TTL should not be touched on |
| 307 | * decapsulation. There's no reason this comment should be here, but |
| 308 | * this is as good as any a position. |
| 309 | */ |
| 310 | |
| 311 | /* Some sanity checks in the inner IP header */ |
| 312 | switch (v >> 4) { |
| 313 | #ifdef INET |
| 314 | case 4: |
| 315 | ipo = mtod(m, struct ip *); |
| 316 | ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos); |
| 317 | break; |
| 318 | #endif /* INET */ |
| 319 | #ifdef INET6 |
| 320 | case 6: |
| 321 | ip6 = (struct ip6_hdr *) ipo; |
| 322 | itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; |
| 323 | ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos); |
| 324 | ip6->ip6_flow &= ~htonl(0xff << 20); |
| 325 | ip6->ip6_flow |= htonl((u_int32_t) itos << 20); |
| 326 | break; |
| 327 | #endif |
| 328 | default: |
| 329 | panic("ipip_input: unknown ip version %u (inner)" , v>>4); |
| 330 | } |
| 331 | |
| 332 | /* Check for local address spoofing. */ |
| 333 | if ((m_get_rcvif_NOMPSAFE(m) == NULL || |
| 334 | !(m_get_rcvif_NOMPSAFE(m)->if_flags & IFF_LOOPBACK)) && |
| 335 | ipip_allow != 2) { |
| 336 | int s = pserialize_read_enter(); |
| 337 | IFNET_READER_FOREACH(ifp) { |
| 338 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 339 | #ifdef INET |
| 340 | if (ipo) { |
| 341 | if (ifa->ifa_addr->sa_family != |
| 342 | AF_INET) |
| 343 | continue; |
| 344 | |
| 345 | sin = (struct sockaddr_in *) ifa->ifa_addr; |
| 346 | |
| 347 | if (sin->sin_addr.s_addr == |
| 348 | ipo->ip_src.s_addr) { |
| 349 | pserialize_read_exit(s); |
| 350 | IPIP_STATINC(IPIP_STAT_SPOOF); |
| 351 | m_freem(m); |
| 352 | return; |
| 353 | } |
| 354 | } |
| 355 | #endif /* INET */ |
| 356 | |
| 357 | #ifdef INET6 |
| 358 | if (ip6) { |
| 359 | if (ifa->ifa_addr->sa_family != |
| 360 | AF_INET6) |
| 361 | continue; |
| 362 | |
| 363 | sin6 = (struct sockaddr_in6 *) ifa->ifa_addr; |
| 364 | |
| 365 | if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) { |
| 366 | pserialize_read_exit(s); |
| 367 | IPIP_STATINC(IPIP_STAT_SPOOF); |
| 368 | m_freem(m); |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | } |
| 373 | #endif /* INET6 */ |
| 374 | } |
| 375 | } |
| 376 | pserialize_read_exit(s); |
| 377 | } |
| 378 | |
| 379 | /* Statistics */ |
| 380 | IPIP_STATADD(IPIP_STAT_IBYTES, m->m_pkthdr.len - iphlen); |
| 381 | |
| 382 | /* |
| 383 | * Interface pointer stays the same; if no IPsec processing has |
| 384 | * been done (or will be done), this will point to a normal |
| 385 | * interface. Otherwise, it'll point to an enc interface, which |
| 386 | * will allow a packet filter to distinguish between secure and |
| 387 | * untrusted packets. |
| 388 | */ |
| 389 | |
| 390 | switch (v >> 4) { |
| 391 | #ifdef INET |
| 392 | case 4: |
| 393 | pktq = ip_pktq; |
| 394 | break; |
| 395 | #endif |
| 396 | #ifdef INET6 |
| 397 | case 6: |
| 398 | pktq = ip6_pktq; |
| 399 | break; |
| 400 | #endif |
| 401 | default: |
| 402 | panic("ipip_input: should never reach here" ); |
| 403 | } |
| 404 | |
| 405 | int s = splnet(); |
| 406 | if (__predict_false(!pktq_enqueue(pktq, m, 0))) { |
| 407 | IPIP_STATINC(IPIP_STAT_QFULL); |
| 408 | m_freem(m); |
| 409 | } |
| 410 | splx(s); |
| 411 | } |
| 412 | |
| 413 | int |
| 414 | ipip_output( |
| 415 | struct mbuf *m, |
| 416 | struct ipsecrequest *isr, |
| 417 | struct mbuf **mp, |
| 418 | int skip, |
| 419 | int protoff |
| 420 | ) |
| 421 | { |
| 422 | const struct secasvar *sav; |
| 423 | u_int8_t tp, otos; |
| 424 | struct secasindex *saidx; |
| 425 | int error; |
| 426 | #ifdef INET |
| 427 | u_int8_t itos; |
| 428 | struct ip *ipo; |
| 429 | #endif /* INET */ |
| 430 | #ifdef INET6 |
| 431 | struct ip6_hdr *ip6, *ip6o; |
| 432 | #endif /* INET6 */ |
| 433 | |
| 434 | IPSEC_SPLASSERT_SOFTNET("ipip_output" ); |
| 435 | |
| 436 | sav = isr->sav; |
| 437 | IPSEC_ASSERT(sav != NULL, ("ipip_output: null SA" )); |
| 438 | IPSEC_ASSERT(sav->sah != NULL, ("ipip_output: null SAH" )); |
| 439 | |
| 440 | /* XXX Deal with empty TDB source/destination addresses. */ |
| 441 | |
| 442 | m_copydata(m, 0, 1, &tp); |
| 443 | tp = (tp >> 4) & 0xff; /* Get the IP version number. */ |
| 444 | |
| 445 | saidx = &sav->sah->saidx; |
| 446 | switch (saidx->dst.sa.sa_family) { |
| 447 | #ifdef INET |
| 448 | case AF_INET: |
| 449 | if (saidx->src.sa.sa_family != AF_INET || |
| 450 | saidx->src.sin.sin_addr.s_addr == INADDR_ANY || |
| 451 | saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) { |
| 452 | DPRINTF(("ipip_output: unspecified tunnel endpoint " |
| 453 | "address in SA %s/%08lx\n" , |
| 454 | ipsec_address(&saidx->dst), |
| 455 | (u_long) ntohl(sav->spi))); |
| 456 | IPIP_STATINC(IPIP_STAT_UNSPEC); |
| 457 | error = EINVAL; |
| 458 | goto bad; |
| 459 | } |
| 460 | |
| 461 | M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); |
| 462 | if (m == 0) { |
| 463 | DPRINTF(("ipip_output: M_PREPEND failed\n" )); |
| 464 | IPIP_STATINC(IPIP_STAT_HDROPS); |
| 465 | error = ENOBUFS; |
| 466 | goto bad; |
| 467 | } |
| 468 | |
| 469 | ipo = mtod(m, struct ip *); |
| 470 | |
| 471 | ipo->ip_v = IPVERSION; |
| 472 | ipo->ip_hl = 5; |
| 473 | ipo->ip_len = htons(m->m_pkthdr.len); |
| 474 | ipo->ip_ttl = ip_defttl; |
| 475 | ipo->ip_sum = 0; |
| 476 | ipo->ip_src = saidx->src.sin.sin_addr; |
| 477 | ipo->ip_dst = saidx->dst.sin.sin_addr; |
| 478 | |
| 479 | #if defined(__NetBSD__) |
| 480 | ipo->ip_id = ip_newid(NULL); |
| 481 | #elif defined(RANDOM_IP_ID) |
| 482 | ipo->ip_id = ip_randomid(); |
| 483 | #else |
| 484 | ipo->ip_id = htons(ip_id++); |
| 485 | #endif |
| 486 | |
| 487 | /* If the inner protocol is IP... */ |
| 488 | if (tp == IPVERSION) { |
| 489 | /* Save ECN notification */ |
| 490 | m_copydata(m, sizeof(struct ip) + |
| 491 | offsetof(struct ip, ip_tos), |
| 492 | sizeof(u_int8_t), &itos); |
| 493 | |
| 494 | ipo->ip_p = IPPROTO_IPIP; |
| 495 | |
| 496 | /* |
| 497 | * We should be keeping tunnel soft-state and |
| 498 | * send back ICMPs if needed. |
| 499 | */ |
| 500 | m_copydata(m, sizeof(struct ip) + |
| 501 | offsetof(struct ip, ip_off), |
| 502 | sizeof(u_int16_t), &ipo->ip_off); |
| 503 | ipo->ip_off &= ~ IP_OFF_CONVERT(IP_DF | IP_MF | IP_OFFMASK); |
| 504 | } |
| 505 | #ifdef INET6 |
| 506 | else if (tp == (IPV6_VERSION >> 4)) { |
| 507 | u_int32_t itos32; |
| 508 | |
| 509 | /* Save ECN notification. */ |
| 510 | m_copydata(m, sizeof(struct ip) + |
| 511 | offsetof(struct ip6_hdr, ip6_flow), |
| 512 | sizeof(u_int32_t), &itos32); |
| 513 | itos = ntohl(itos32) >> 20; |
| 514 | ipo->ip_p = IPPROTO_IPV6; |
| 515 | ipo->ip_off = 0; |
| 516 | } |
| 517 | #endif /* INET6 */ |
| 518 | else { |
| 519 | goto nofamily; |
| 520 | } |
| 521 | |
| 522 | otos = 0; |
| 523 | ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); |
| 524 | ipo->ip_tos = otos; |
| 525 | break; |
| 526 | #endif /* INET */ |
| 527 | |
| 528 | #ifdef INET6 |
| 529 | case AF_INET6: |
| 530 | if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) || |
| 531 | saidx->src.sa.sa_family != AF_INET6 || |
| 532 | IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) { |
| 533 | DPRINTF(("ipip_output: unspecified tunnel endpoint " |
| 534 | "address in SA %s/%08lx\n" , |
| 535 | ipsec_address(&saidx->dst), |
| 536 | (u_long) ntohl(sav->spi))); |
| 537 | IPIP_STATINC(IPIP_STAT_UNSPEC); |
| 538 | error = ENOBUFS; |
| 539 | goto bad; |
| 540 | } |
| 541 | |
| 542 | if (tp == (IPV6_VERSION >> 4)) { |
| 543 | /* scoped address handling */ |
| 544 | ip6 = mtod(m, struct ip6_hdr *); |
| 545 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) |
| 546 | ip6->ip6_src.s6_addr16[1] = 0; |
| 547 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) |
| 548 | ip6->ip6_dst.s6_addr16[1] = 0; |
| 549 | } |
| 550 | |
| 551 | M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); |
| 552 | if (m == 0) { |
| 553 | DPRINTF(("ipip_output: M_PREPEND failed\n" )); |
| 554 | IPIP_STATINC(IPIP_STAT_HDROPS); |
| 555 | error = ENOBUFS; |
| 556 | goto bad; |
| 557 | } |
| 558 | |
| 559 | /* Initialize IPv6 header */ |
| 560 | ip6o = mtod(m, struct ip6_hdr *); |
| 561 | ip6o->ip6_flow = 0; |
| 562 | ip6o->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 563 | ip6o->ip6_vfc |= IPV6_VERSION; |
| 564 | ip6o->ip6_plen = htons(m->m_pkthdr.len); |
| 565 | ip6o->ip6_hlim = ip_defttl; |
| 566 | ip6o->ip6_dst = saidx->dst.sin6.sin6_addr; |
| 567 | ip6o->ip6_src = saidx->src.sin6.sin6_addr; |
| 568 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_dst)) |
| 569 | ip6o->ip6_dst.s6_addr16[1] = htons(saidx->dst.sin6.sin6_scope_id); |
| 570 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6o->ip6_src)) |
| 571 | ip6o->ip6_src.s6_addr16[1] = htons(saidx->src.sin6.sin6_scope_id); |
| 572 | |
| 573 | #ifdef INET |
| 574 | if (tp == IPVERSION) { |
| 575 | /* Save ECN notification */ |
| 576 | m_copydata(m, sizeof(struct ip6_hdr) + |
| 577 | offsetof(struct ip, ip_tos), sizeof(u_int8_t), |
| 578 | &itos); |
| 579 | |
| 580 | /* This is really IPVERSION. */ |
| 581 | ip6o->ip6_nxt = IPPROTO_IPIP; |
| 582 | } else |
| 583 | #endif /* INET */ |
| 584 | if (tp == (IPV6_VERSION >> 4)) { |
| 585 | u_int32_t itos32; |
| 586 | |
| 587 | /* Save ECN notification. */ |
| 588 | m_copydata(m, sizeof(struct ip6_hdr) + |
| 589 | offsetof(struct ip6_hdr, ip6_flow), |
| 590 | sizeof(u_int32_t), &itos32); |
| 591 | itos = ntohl(itos32) >> 20; |
| 592 | |
| 593 | ip6o->ip6_nxt = IPPROTO_IPV6; |
| 594 | } else { |
| 595 | goto nofamily; |
| 596 | } |
| 597 | |
| 598 | otos = 0; |
| 599 | ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); |
| 600 | ip6o->ip6_flow |= htonl((u_int32_t) otos << 20); |
| 601 | break; |
| 602 | #endif /* INET6 */ |
| 603 | |
| 604 | default: |
| 605 | nofamily: |
| 606 | DPRINTF(("ipip_output: unsupported protocol family %u\n" , |
| 607 | saidx->dst.sa.sa_family)); |
| 608 | IPIP_STATINC(IPIP_STAT_FAMILY); |
| 609 | error = EAFNOSUPPORT; /* XXX diffs from openbsd */ |
| 610 | goto bad; |
| 611 | } |
| 612 | |
| 613 | IPIP_STATINC(IPIP_STAT_OPACKETS); |
| 614 | *mp = m; |
| 615 | |
| 616 | #ifdef INET |
| 617 | if (saidx->dst.sa.sa_family == AF_INET) { |
| 618 | #if 0 |
| 619 | if (sav->tdb_xform->xf_type == XF_IP4) |
| 620 | tdb->tdb_cur_bytes += |
| 621 | m->m_pkthdr.len - sizeof(struct ip); |
| 622 | #endif |
| 623 | IPIP_STATADD(IPIP_STAT_OBYTES, |
| 624 | m->m_pkthdr.len - sizeof(struct ip)); |
| 625 | } |
| 626 | #endif /* INET */ |
| 627 | |
| 628 | #ifdef INET6 |
| 629 | if (saidx->dst.sa.sa_family == AF_INET6) { |
| 630 | #if 0 |
| 631 | if (sav->tdb_xform->xf_type == XF_IP4) |
| 632 | tdb->tdb_cur_bytes += |
| 633 | m->m_pkthdr.len - sizeof(struct ip6_hdr); |
| 634 | #endif |
| 635 | IPIP_STATADD(IPIP_STAT_OBYTES, |
| 636 | m->m_pkthdr.len - sizeof(struct ip6_hdr)); |
| 637 | } |
| 638 | #endif /* INET6 */ |
| 639 | |
| 640 | return 0; |
| 641 | bad: |
| 642 | if (m) |
| 643 | m_freem(m); |
| 644 | *mp = NULL; |
| 645 | return (error); |
| 646 | } |
| 647 | |
| 648 | static int |
| 649 | ipe4_init(struct secasvar *sav, const struct xformsw *xsp) |
| 650 | { |
| 651 | sav->tdb_xform = xsp; |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static int |
| 656 | ipe4_zeroize(struct secasvar *sav) |
| 657 | { |
| 658 | sav->tdb_xform = NULL; |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | static int |
| 663 | ipe4_input( |
| 664 | struct mbuf *m, |
| 665 | const struct secasvar *sav, |
| 666 | int skip, |
| 667 | int protoff |
| 668 | ) |
| 669 | { |
| 670 | /* This is a rather serious mistake, so no conditional printing. */ |
| 671 | printf("ipe4_input: should never be called\n" ); |
| 672 | if (m) |
| 673 | m_freem(m); |
| 674 | return EOPNOTSUPP; |
| 675 | } |
| 676 | |
| 677 | static struct xformsw ipe4_xformsw = { |
| 678 | XF_IP4, 0, "IPv4 Simple Encapsulation" , |
| 679 | ipe4_init, ipe4_zeroize, ipe4_input, ipip_output, |
| 680 | NULL, |
| 681 | }; |
| 682 | |
| 683 | #ifdef INET |
| 684 | static struct encapsw ipe4_encapsw = { |
| 685 | .encapsw4 = { |
| 686 | .pr_input = ip4_input, |
| 687 | .pr_ctlinput = NULL, |
| 688 | } |
| 689 | }; |
| 690 | #endif |
| 691 | #ifdef INET6 |
| 692 | static struct encapsw ipe4_encapsw6 = { |
| 693 | .encapsw6 = { |
| 694 | .pr_input = ip4_input6, |
| 695 | .pr_ctlinput = NULL, |
| 696 | } |
| 697 | }; |
| 698 | #endif |
| 699 | |
| 700 | /* |
| 701 | * Check the encapsulated packet to see if we want it |
| 702 | */ |
| 703 | static int |
| 704 | ipe4_encapcheck(struct mbuf *m, |
| 705 | int off, |
| 706 | int proto, |
| 707 | void *arg |
| 708 | ) |
| 709 | { |
| 710 | /* |
| 711 | * Only take packets coming from IPSEC tunnels; the rest |
| 712 | * must be handled by the gif tunnel code. Note that we |
| 713 | * also return a minimum priority when we want the packet |
| 714 | * so any explicit gif tunnels take precedence. |
| 715 | */ |
| 716 | return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0); |
| 717 | } |
| 718 | |
| 719 | INITFN void |
| 720 | ipe4_attach(void) |
| 721 | { |
| 722 | |
| 723 | ipipstat_percpu = percpu_alloc(sizeof(uint64_t) * IPIP_NSTATS); |
| 724 | |
| 725 | xform_register(&ipe4_xformsw); |
| 726 | /* attach to encapsulation framework */ |
| 727 | /* XXX save return cookie for detach on module remove */ |
| 728 | |
| 729 | encapinit(); |
| 730 | /* This function is called before ifinit(). Who else gets lock? */ |
| 731 | (void)encap_lock_enter(); |
| 732 | /* ipe4_encapsw and ipe4_encapsw must be added atomically */ |
| 733 | #ifdef INET |
| 734 | (void) encap_attach_func(AF_INET, -1, |
| 735 | ipe4_encapcheck, &ipe4_encapsw, NULL); |
| 736 | #endif |
| 737 | #ifdef INET6 |
| 738 | (void) encap_attach_func(AF_INET6, -1, |
| 739 | ipe4_encapcheck, &ipe4_encapsw6, NULL); |
| 740 | #endif |
| 741 | encap_lock_exit(); |
| 742 | } |
| 743 | |
| 744 | #ifdef SYSINIT |
| 745 | SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL); |
| 746 | #endif |
| 747 | |
| 748 | |