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sys/netinet6/ip6_input.c
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1 /* $NetBSD: ip6_input.c,v 1.77.10.2 2007/04/26 06:55:11 ghen Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.77.10.2 2007/04/26 06:55:11 ghen Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pfil_hooks.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/proc.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/if_dl.h> 89 #include <net/route.h> 90 #include <net/netisr.h> 91 #ifdef PFIL_HOOKS 92 #include <net/pfil.h> 93 #endif 94 95 #include <netinet/in.h> 96 #include <netinet/in_systm.h> 97 #ifdef INET 98 #include <netinet/ip.h> 99 #include <netinet/ip_icmp.h> 100 #endif /* INET */ 101 #include <netinet/ip6.h> 102 #include <netinet6/in6_var.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/in6_ifattach.h> 107 #include <netinet6/nd6.h> 108 109 #ifdef IPSEC 110 #include <netinet6/ipsec.h> 111 #endif 112 113 #include <netinet6/ip6protosw.h> 114 115 #include "faith.h" 116 #include "gif.h" 117 118 #if NGIF > 0 119 #include <netinet6/in6_gif.h> 120 #endif 121 122 #include <net/net_osdep.h> 123 124 extern struct domain inet6domain; 125 126 u_char ip6_protox[IPPROTO_MAX]; 127 static int ip6qmaxlen = IFQ_MAXLEN; 128 struct in6_ifaddr *in6_ifaddr; 129 struct ifqueue ip6intrq; 130 131 int ip6_forward_srcrt; /* XXX */ 132 int ip6_sourcecheck; /* XXX */ 133 int ip6_sourcecheck_interval; /* XXX */ 134 135 #ifdef PFIL_HOOKS 136 struct pfil_head inet6_pfil_hook; 137 #endif 138 139 struct ip6stat ip6stat; 140 141 static void ip6_init2 __P((void *)); 142 143 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 144 static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); 145 146 /* 147 * IP6 initialization: fill in IP6 protocol switch table. 148 * All protocols not implemented in kernel go to raw IP6 protocol handler. 149 */ 150 void 151 ip6_init() 152 { 153 struct ip6protosw *pr; 154 int i; 155 156 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 157 if (pr == 0) 158 panic("ip6_init"); 159 for (i = 0; i < IPPROTO_MAX; i++) 160 ip6_protox[i] = pr - inet6sw; 161 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 162 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 163 if (pr->pr_domain->dom_family == PF_INET6 && 164 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 165 ip6_protox[pr->pr_protocol] = pr - inet6sw; 166 ip6intrq.ifq_maxlen = ip6qmaxlen; 167 nd6_init(); 168 frag6_init(); 169 170 ip6_init2((void *)0); 171 172 #ifdef PFIL_HOOKS 173 /* Register our Packet Filter hook. */ 174 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 175 inet6_pfil_hook.ph_af = AF_INET6; 176 i = pfil_head_register(&inet6_pfil_hook); 177 if (i != 0) 178 printf("ip6_init: WARNING: unable to register pfil hook, " 179 "error %d\n", i); 180 #endif /* PFIL_HOOKS */ 181 } 182 183 static void 184 ip6_init2(dummy) 185 void *dummy; 186 { 187 188 /* nd6_timer_init */ 189 callout_init(&nd6_timer_ch); 190 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 191 } 192 193 /* 194 * IP6 input interrupt handling. Just pass the packet to ip6_input. 195 */ 196 void 197 ip6intr() 198 { 199 int s; 200 struct mbuf *m; 201 202 for (;;) { 203 s = splnet(); 204 IF_DEQUEUE(&ip6intrq, m); 205 splx(s); 206 if (m == 0) 207 return; 208 ip6_input(m); 209 } 210 } 211 212 extern struct route_in6 ip6_forward_rt; 213 214 void 215 ip6_input(m) 216 struct mbuf *m; 217 { 218 struct ip6_hdr *ip6; 219 int off = sizeof(struct ip6_hdr), nest; 220 u_int32_t plen; 221 u_int32_t rtalert = ~0; 222 int nxt, ours = 0; 223 struct ifnet *deliverifp = NULL; 224 int srcrt = 0; 225 226 #ifdef IPSEC 227 /* 228 * should the inner packet be considered authentic? 229 * see comment in ah4_input(). 230 */ 231 m->m_flags &= ~M_AUTHIPHDR; 232 m->m_flags &= ~M_AUTHIPDGM; 233 #endif 234 235 /* 236 * mbuf statistics 237 */ 238 if (m->m_flags & M_EXT) { 239 if (m->m_next) 240 ip6stat.ip6s_mext2m++; 241 else 242 ip6stat.ip6s_mext1++; 243 } else { 244 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0])) 245 if (m->m_next) { 246 if (m->m_flags & M_LOOP) { 247 ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ 248 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 249 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 250 else 251 ip6stat.ip6s_m2m[0]++; 252 } else 253 ip6stat.ip6s_m1++; 254 #undef M2MMAX 255 } 256 257 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 258 ip6stat.ip6s_total++; 259 260 /* 261 * If the IPv6 header is not aligned, slurp it up into a new 262 * mbuf with space for link headers, in the event we forward 263 * it. OTherwise, if it is aligned, make sure the entire base 264 * IPv6 header is in the first mbuf of the chain. 265 */ 266 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 267 struct ifnet *inifp = m->m_pkthdr.rcvif; 268 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 269 (max_linkhdr + 3) & ~3)) == NULL) { 270 /* XXXJRT new stat, please */ 271 ip6stat.ip6s_toosmall++; 272 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 273 return; 274 } 275 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 276 struct ifnet *inifp = m->m_pkthdr.rcvif; 277 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 278 ip6stat.ip6s_toosmall++; 279 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 280 return; 281 } 282 } 283 284 ip6 = mtod(m, struct ip6_hdr *); 285 286 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 287 ip6stat.ip6s_badvers++; 288 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 289 goto bad; 290 } 291 292 #ifdef PFIL_HOOKS 293 /* 294 * Run through list of hooks for input packets. If there are any 295 * filters which require that additional packets in the flow are 296 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 297 * Note that filters must _never_ set this flag, as another filter 298 * in the list may have previously cleared it. 299 */ 300 /* 301 * let ipfilter look at packet on the wire, 302 * not the decapsulated packet. 303 */ 304 #ifdef IPSEC 305 if (!ipsec_getnhist(m)) 306 #else 307 if (1) 308 #endif 309 { 310 struct in6_addr odst; 311 312 odst = ip6->ip6_dst; 313 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 314 PFIL_IN) != 0) 315 return; 316 if (m == NULL) 317 return; 318 ip6 = mtod(m, struct ip6_hdr *); 319 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 320 } 321 #endif /* PFIL_HOOKS */ 322 323 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 324 325 #ifdef ALTQ 326 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 327 /* packet is dropped by traffic conditioner */ 328 return; 329 } 330 #endif 331 332 /* 333 * Check against address spoofing/corruption. 334 */ 335 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 336 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 337 /* 338 * XXX: "badscope" is not very suitable for a multicast source. 339 */ 340 ip6stat.ip6s_badscope++; 341 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 342 goto bad; 343 } 344 /* 345 * The following check is not documented in specs. A malicious 346 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 347 * and bypass security checks (act as if it was from 127.0.0.1 by using 348 * IPv6 src ::ffff:127.0.0.1). Be cautious. 349 * 350 * This check chokes if we are in an SIIT cloud. As none of BSDs 351 * support IPv4-less kernel compilation, we cannot support SIIT 352 * environment at all. So, it makes more sense for us to reject any 353 * malicious packets for non-SIIT environment, than try to do a 354 * partial support for SIIT environment. 355 */ 356 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 357 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 358 ip6stat.ip6s_badscope++; 359 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 360 goto bad; 361 } 362 #if 0 363 /* 364 * Reject packets with IPv4 compatible addresses (auto tunnel). 365 * 366 * The code forbids auto tunnel relay case in RFC1933 (the check is 367 * stronger than RFC1933). We may want to re-enable it if mech-xx 368 * is revised to forbid relaying case. 369 */ 370 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 371 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 372 ip6stat.ip6s_badscope++; 373 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 374 goto bad; 375 } 376 #endif 377 378 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 379 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 380 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 381 ours = 1; 382 deliverifp = m->m_pkthdr.rcvif; 383 goto hbhcheck; 384 } else { 385 ip6stat.ip6s_badscope++; 386 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 387 goto bad; 388 } 389 } 390 391 /* drop packets if interface ID portion is already filled */ 392 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 393 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) && 394 ip6->ip6_src.s6_addr16[1]) { 395 ip6stat.ip6s_badscope++; 396 goto bad; 397 } 398 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) && 399 ip6->ip6_dst.s6_addr16[1]) { 400 ip6stat.ip6s_badscope++; 401 goto bad; 402 } 403 } 404 405 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 406 ip6->ip6_src.s6_addr16[1] 407 = htons(m->m_pkthdr.rcvif->if_index); 408 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 409 ip6->ip6_dst.s6_addr16[1] 410 = htons(m->m_pkthdr.rcvif->if_index); 411 412 /* 413 * We use rt->rt_ifp to determine if the address is ours or not. 414 * If rt_ifp is lo0, the address is ours. 415 * The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0, 416 * so any address under fe80::%lo0/64 will be mistakenly considered 417 * local. The special case is supplied to handle the case properly 418 * by actually looking at interface addresses 419 * (using in6ifa_ifpwithaddr). 420 */ 421 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 && 422 IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 423 if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) { 424 icmp6_error(m, ICMP6_DST_UNREACH, 425 ICMP6_DST_UNREACH_ADDR, 0); 426 /* m is already freed */ 427 return; 428 } 429 430 ours = 1; 431 deliverifp = m->m_pkthdr.rcvif; 432 goto hbhcheck; 433 } 434 435 /* 436 * Multicast check 437 */ 438 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 439 struct in6_multi *in6m = 0; 440 441 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 442 /* 443 * See if we belong to the destination multicast group on the 444 * arrival interface. 445 */ 446 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 447 if (in6m) 448 ours = 1; 449 else if (!ip6_mrouter) { 450 ip6stat.ip6s_notmember++; 451 ip6stat.ip6s_cantforward++; 452 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 453 goto bad; 454 } 455 deliverifp = m->m_pkthdr.rcvif; 456 goto hbhcheck; 457 } 458 459 /* 460 * Unicast check 461 */ 462 if (ip6_forward_rt.ro_rt != NULL && 463 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && 464 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 465 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) 466 ip6stat.ip6s_forward_cachehit++; 467 else { 468 struct sockaddr_in6 *dst6; 469 470 if (ip6_forward_rt.ro_rt) { 471 /* route is down or destination is different */ 472 ip6stat.ip6s_forward_cachemiss++; 473 RTFREE(ip6_forward_rt.ro_rt); 474 ip6_forward_rt.ro_rt = 0; 475 } 476 477 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 478 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst; 479 dst6->sin6_len = sizeof(struct sockaddr_in6); 480 dst6->sin6_family = AF_INET6; 481 dst6->sin6_addr = ip6->ip6_dst; 482 483 rtalloc((struct route *)&ip6_forward_rt); 484 } 485 486 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 487 488 /* 489 * Accept the packet if the forwarding interface to the destination 490 * according to the routing table is the loopback interface, 491 * unless the associated route has a gateway. 492 * Note that this approach causes to accept a packet if there is a 493 * route to the loopback interface for the destination of the packet. 494 * But we think it's even useful in some situations, e.g. when using 495 * a special daemon which wants to intercept the packet. 496 */ 497 if (ip6_forward_rt.ro_rt && 498 (ip6_forward_rt.ro_rt->rt_flags & 499 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 500 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) && 501 #if 0 502 /* 503 * The check below is redundant since the comparison of 504 * the destination and the key of the rtentry has 505 * already done through looking up the routing table. 506 */ 507 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 508 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 509 #endif 510 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 511 struct in6_ifaddr *ia6 = 512 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 513 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 514 m->m_flags |= M_ANYCAST6; 515 /* 516 * packets to a tentative, duplicated, or somehow invalid 517 * address must not be accepted. 518 */ 519 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 520 /* this address is ready */ 521 ours = 1; 522 deliverifp = ia6->ia_ifp; /* correct? */ 523 goto hbhcheck; 524 } else { 525 /* address is not ready, so discard the packet. */ 526 nd6log((LOG_INFO, 527 "ip6_input: packet to an unready address %s->%s\n", 528 ip6_sprintf(&ip6->ip6_src), 529 ip6_sprintf(&ip6->ip6_dst))); 530 531 goto bad; 532 } 533 } 534 535 /* 536 * FAITH (Firewall Aided Internet Translator) 537 */ 538 #if defined(NFAITH) && 0 < NFAITH 539 if (ip6_keepfaith) { 540 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp && 541 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 542 /* XXX do we need more sanity checks? */ 543 ours = 1; 544 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */ 545 goto hbhcheck; 546 } 547 } 548 #endif 549 550 #if 0 551 { 552 /* 553 * Last resort: check in6_ifaddr for incoming interface. 554 * The code is here until I update the "goto ours hack" code above 555 * working right. 556 */ 557 struct ifaddr *ifa; 558 for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; 559 ifa; 560 ifa = ifa->ifa_list.tqe_next) { 561 if (ifa->ifa_addr == NULL) 562 continue; /* just for safety */ 563 if (ifa->ifa_addr->sa_family != AF_INET6) 564 continue; 565 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 566 ours = 1; 567 deliverifp = ifa->ifa_ifp; 568 goto hbhcheck; 569 } 570 } 571 } 572 #endif 573 574 /* 575 * Now there is no reason to process the packet if it's not our own 576 * and we're not a router. 577 */ 578 if (!ip6_forwarding) { 579 ip6stat.ip6s_cantforward++; 580 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 581 goto bad; 582 } 583 584 hbhcheck: 585 /* 586 * Process Hop-by-Hop options header if it's contained. 587 * m may be modified in ip6_hopopts_input(). 588 * If a JumboPayload option is included, plen will also be modified. 589 */ 590 plen = (u_int32_t)ntohs(ip6->ip6_plen); 591 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 592 struct ip6_hbh *hbh; 593 594 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 595 #if 0 /*touches NULL pointer*/ 596 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 597 #endif 598 return; /* m have already been freed */ 599 } 600 601 /* adjust pointer */ 602 ip6 = mtod(m, struct ip6_hdr *); 603 604 /* 605 * if the payload length field is 0 and the next header field 606 * indicates Hop-by-Hop Options header, then a Jumbo Payload 607 * option MUST be included. 608 */ 609 if (ip6->ip6_plen == 0 && plen == 0) { 610 /* 611 * Note that if a valid jumbo payload option is 612 * contained, ip6_hoptops_input() must set a valid 613 * (non-zero) payload length to the variable plen. 614 */ 615 ip6stat.ip6s_badoptions++; 616 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 617 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 618 icmp6_error(m, ICMP6_PARAM_PROB, 619 ICMP6_PARAMPROB_HEADER, 620 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 621 return; 622 } 623 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 624 sizeof(struct ip6_hbh)); 625 if (hbh == NULL) { 626 ip6stat.ip6s_tooshort++; 627 return; 628 } 629 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 630 nxt = hbh->ip6h_nxt; 631 632 /* 633 * accept the packet if a router alert option is included 634 * and we act as an IPv6 router. 635 */ 636 if (rtalert != ~0 && ip6_forwarding) 637 ours = 1; 638 } else 639 nxt = ip6->ip6_nxt; 640 641 /* 642 * Check that the amount of data in the buffers 643 * is as at least much as the IPv6 header would have us expect. 644 * Trim mbufs if longer than we expect. 645 * Drop packet if shorter than we expect. 646 */ 647 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 648 ip6stat.ip6s_tooshort++; 649 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 650 goto bad; 651 } 652 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 653 if (m->m_len == m->m_pkthdr.len) { 654 m->m_len = sizeof(struct ip6_hdr) + plen; 655 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 656 } else 657 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 658 } 659 660 /* 661 * Forward if desirable. 662 */ 663 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 664 /* 665 * If we are acting as a multicast router, all 666 * incoming multicast packets are passed to the 667 * kernel-level multicast forwarding function. 668 * The packet is returned (relatively) intact; if 669 * ip6_mforward() returns a non-zero value, the packet 670 * must be discarded, else it may be accepted below. 671 */ 672 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 673 ip6stat.ip6s_cantforward++; 674 m_freem(m); 675 return; 676 } 677 if (!ours) { 678 m_freem(m); 679 return; 680 } 681 } else if (!ours) { 682 ip6_forward(m, srcrt); 683 return; 684 } 685 686 ip6 = mtod(m, struct ip6_hdr *); 687 688 /* 689 * Malicious party may be able to use IPv4 mapped addr to confuse 690 * tcp/udp stack and bypass security checks (act as if it was from 691 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 692 * 693 * For SIIT end node behavior, you may want to disable the check. 694 * However, you will become vulnerable to attacks using IPv4 mapped 695 * source. 696 */ 697 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 698 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 699 ip6stat.ip6s_badscope++; 700 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 701 goto bad; 702 } 703 704 /* 705 * Tell launch routine the next header 706 */ 707 #ifdef IFA_STATS 708 if (deliverifp != NULL) { 709 struct in6_ifaddr *ia6; 710 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 711 if (ia6) 712 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 713 } 714 #endif 715 ip6stat.ip6s_delivered++; 716 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 717 nest = 0; 718 719 while (nxt != IPPROTO_DONE) { 720 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 721 ip6stat.ip6s_toomanyhdr++; 722 goto bad; 723 } 724 725 /* 726 * protection against faulty packet - there should be 727 * more sanity checks in header chain processing. 728 */ 729 if (m->m_pkthdr.len < off) { 730 ip6stat.ip6s_tooshort++; 731 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 732 goto bad; 733 } 734 735 #ifdef IPSEC 736 /* 737 * enforce IPsec policy checking if we are seeing last header. 738 * note that we do not visit this with protocols with pcb layer 739 * code - like udp/tcp/raw ip. 740 */ 741 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 742 ipsec6_in_reject(m, NULL)) { 743 ipsec6stat.in_polvio++; 744 goto bad; 745 } 746 #endif 747 748 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 749 } 750 return; 751 bad: 752 m_freem(m); 753 } 754 755 /* 756 * Hop-by-Hop options header processing. If a valid jumbo payload option is 757 * included, the real payload length will be stored in plenp. 758 */ 759 static int 760 ip6_hopopts_input(plenp, rtalertp, mp, offp) 761 u_int32_t *plenp; 762 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 763 struct mbuf **mp; 764 int *offp; 765 { 766 struct mbuf *m = *mp; 767 int off = *offp, hbhlen; 768 struct ip6_hbh *hbh; 769 770 /* validation of the length of the header */ 771 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 772 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 773 if (hbh == NULL) { 774 ip6stat.ip6s_tooshort++; 775 return -1; 776 } 777 hbhlen = (hbh->ip6h_len + 1) << 3; 778 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 779 hbhlen); 780 if (hbh == NULL) { 781 ip6stat.ip6s_tooshort++; 782 return -1; 783 } 784 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 785 off += hbhlen; 786 hbhlen -= sizeof(struct ip6_hbh); 787 788 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 789 hbhlen, rtalertp, plenp) < 0) 790 return (-1); 791 792 *offp = off; 793 *mp = m; 794 return (0); 795 } 796 797 /* 798 * Search header for all Hop-by-hop options and process each option. 799 * This function is separate from ip6_hopopts_input() in order to 800 * handle a case where the sending node itself process its hop-by-hop 801 * options header. In such a case, the function is called from ip6_output(). 802 * 803 * The function assumes that hbh header is located right after the IPv6 header 804 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 805 * opthead + hbhlen is located in continuous memory region. 806 */ 807 int 808 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 809 struct mbuf *m; 810 u_int8_t *opthead; 811 int hbhlen; 812 u_int32_t *rtalertp; 813 u_int32_t *plenp; 814 { 815 struct ip6_hdr *ip6; 816 int optlen = 0; 817 u_int8_t *opt = opthead; 818 u_int16_t rtalert_val; 819 u_int32_t jumboplen; 820 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 821 822 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 823 switch (*opt) { 824 case IP6OPT_PAD1: 825 optlen = 1; 826 break; 827 case IP6OPT_PADN: 828 if (hbhlen < IP6OPT_MINLEN) { 829 ip6stat.ip6s_toosmall++; 830 goto bad; 831 } 832 optlen = *(opt + 1) + 2; 833 break; 834 case IP6OPT_RTALERT: 835 /* XXX may need check for alignment */ 836 if (hbhlen < IP6OPT_RTALERT_LEN) { 837 ip6stat.ip6s_toosmall++; 838 goto bad; 839 } 840 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 841 /* XXX stat */ 842 icmp6_error(m, ICMP6_PARAM_PROB, 843 ICMP6_PARAMPROB_HEADER, 844 erroff + opt + 1 - opthead); 845 return (-1); 846 } 847 optlen = IP6OPT_RTALERT_LEN; 848 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 849 *rtalertp = ntohs(rtalert_val); 850 break; 851 case IP6OPT_JUMBO: 852 /* XXX may need check for alignment */ 853 if (hbhlen < IP6OPT_JUMBO_LEN) { 854 ip6stat.ip6s_toosmall++; 855 goto bad; 856 } 857 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 858 /* XXX stat */ 859 icmp6_error(m, ICMP6_PARAM_PROB, 860 ICMP6_PARAMPROB_HEADER, 861 erroff + opt + 1 - opthead); 862 return (-1); 863 } 864 optlen = IP6OPT_JUMBO_LEN; 865 866 /* 867 * IPv6 packets that have non 0 payload length 868 * must not contain a jumbo payload option. 869 */ 870 ip6 = mtod(m, struct ip6_hdr *); 871 if (ip6->ip6_plen) { 872 ip6stat.ip6s_badoptions++; 873 icmp6_error(m, ICMP6_PARAM_PROB, 874 ICMP6_PARAMPROB_HEADER, 875 erroff + opt - opthead); 876 return (-1); 877 } 878 879 /* 880 * We may see jumbolen in unaligned location, so 881 * we'd need to perform bcopy(). 882 */ 883 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 884 jumboplen = (u_int32_t)htonl(jumboplen); 885 886 #if 1 887 /* 888 * if there are multiple jumbo payload options, 889 * *plenp will be non-zero and the packet will be 890 * rejected. 891 * the behavior may need some debate in ipngwg - 892 * multiple options does not make sense, however, 893 * there's no explicit mention in specification. 894 */ 895 if (*plenp != 0) { 896 ip6stat.ip6s_badoptions++; 897 icmp6_error(m, ICMP6_PARAM_PROB, 898 ICMP6_PARAMPROB_HEADER, 899 erroff + opt + 2 - opthead); 900 return (-1); 901 } 902 #endif 903 904 /* 905 * jumbo payload length must be larger than 65535. 906 */ 907 if (jumboplen <= IPV6_MAXPACKET) { 908 ip6stat.ip6s_badoptions++; 909 icmp6_error(m, ICMP6_PARAM_PROB, 910 ICMP6_PARAMPROB_HEADER, 911 erroff + opt + 2 - opthead); 912 return (-1); 913 } 914 *plenp = jumboplen; 915 916 break; 917 default: /* unknown option */ 918 if (hbhlen < IP6OPT_MINLEN) { 919 ip6stat.ip6s_toosmall++; 920 goto bad; 921 } 922 optlen = ip6_unknown_opt(opt, m, 923 erroff + opt - opthead); 924 if (optlen == -1) 925 return (-1); 926 optlen += 2; 927 break; 928 } 929 } 930 931 return (0); 932 933 bad: 934 m_freem(m); 935 return (-1); 936 } 937 938 /* 939 * Unknown option processing. 940 * The third argument `off' is the offset from the IPv6 header to the option, 941 * which is necessary if the IPv6 header the and option header and IPv6 header 942 * is not continuous in order to return an ICMPv6 error. 943 */ 944 int 945 ip6_unknown_opt(optp, m, off) 946 u_int8_t *optp; 947 struct mbuf *m; 948 int off; 949 { 950 struct ip6_hdr *ip6; 951 952 switch (IP6OPT_TYPE(*optp)) { 953 case IP6OPT_TYPE_SKIP: /* ignore the option */ 954 return ((int)*(optp + 1)); 955 case IP6OPT_TYPE_DISCARD: /* silently discard */ 956 m_freem(m); 957 return (-1); 958 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 959 ip6stat.ip6s_badoptions++; 960 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 961 return (-1); 962 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 963 ip6stat.ip6s_badoptions++; 964 ip6 = mtod(m, struct ip6_hdr *); 965 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 966 (m->m_flags & (M_BCAST|M_MCAST))) 967 m_freem(m); 968 else 969 icmp6_error(m, ICMP6_PARAM_PROB, 970 ICMP6_PARAMPROB_OPTION, off); 971 return (-1); 972 } 973 974 m_freem(m); /* XXX: NOTREACHED */ 975 return (-1); 976 } 977 978 /* 979 * Create the "control" list for this pcb. 980 * 981 * The routine will be called from upper layer handlers like tcp6_input(). 982 * Thus the routine assumes that the caller (tcp6_input) have already 983 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 984 * very first mbuf on the mbuf chain. 985 * We may want to add some infinite loop prevention or sanity checks for safety. 986 * (This applies only when you are using KAME mbuf chain restriction, i.e. 987 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 988 */ 989 void 990 ip6_savecontrol(in6p, mp, ip6, m) 991 struct in6pcb *in6p; 992 struct mbuf **mp; 993 struct ip6_hdr *ip6; 994 struct mbuf *m; 995 { 996 997 #ifdef SO_TIMESTAMP 998 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 999 struct timeval tv; 1000 1001 microtime(&tv); 1002 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1003 SCM_TIMESTAMP, SOL_SOCKET); 1004 if (*mp) 1005 mp = &(*mp)->m_next; 1006 } 1007 #endif 1008 1009 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1010 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1011 return; 1012 1013 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 1014 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 1015 sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6); 1016 if (*mp) 1017 mp = &(*mp)->m_next; 1018 } 1019 1020 #ifdef noyet 1021 /* options were tossed above */ 1022 if (in6p->in6p_flags & IN6P_RECVOPTS) 1023 /* broken */ 1024 /* ip6_srcroute doesn't do what we want here, need to fix */ 1025 if (in6p->in6p_flags & IPV6P_RECVRETOPTS) 1026 /* broken */ 1027 #endif 1028 1029 /* RFC 2292 sec. 5 */ 1030 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1031 struct in6_pktinfo pi6; 1032 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1033 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 1034 pi6.ipi6_addr.s6_addr16[1] = 0; 1035 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 1036 ? m->m_pkthdr.rcvif->if_index 1037 : 0; 1038 *mp = sbcreatecontrol((caddr_t) &pi6, 1039 sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6); 1040 if (*mp) 1041 mp = &(*mp)->m_next; 1042 } 1043 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1044 int hlim = ip6->ip6_hlim & 0xff; 1045 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1046 IPV6_HOPLIMIT, IPPROTO_IPV6); 1047 if (*mp) 1048 mp = &(*mp)->m_next; 1049 } 1050 /* IN6P_NEXTHOP - for outgoing packet only */ 1051 1052 /* 1053 * IPV6_HOPOPTS socket option. Recall that we required super-user 1054 * privilege for the option (see ip6_ctloutput), but it might be too 1055 * strict, since there might be some hop-by-hop options which can be 1056 * returned to normal user. 1057 * See also RFC 2292 section 6. 1058 */ 1059 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1060 /* 1061 * Check if a hop-by-hop options header is contatined in the 1062 * received packet, and if so, store the options as ancillary 1063 * data. Note that a hop-by-hop options header must be 1064 * just after the IPv6 header, which fact is assured through 1065 * the IPv6 input processing. 1066 */ 1067 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1068 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1069 struct ip6_hbh *hbh; 1070 int hbhlen; 1071 struct mbuf *ext; 1072 1073 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1074 ip6->ip6_nxt); 1075 if (ext == NULL) { 1076 ip6stat.ip6s_tooshort++; 1077 return; 1078 } 1079 hbh = mtod(ext, struct ip6_hbh *); 1080 hbhlen = (hbh->ip6h_len + 1) << 3; 1081 if (hbhlen != ext->m_len) { 1082 m_freem(ext); 1083 ip6stat.ip6s_tooshort++; 1084 return; 1085 } 1086 1087 /* 1088 * XXX: We copy whole the header even if a jumbo 1089 * payload option is included, which option is to 1090 * be removed before returning in the RFC 2292. 1091 * But it's too painful operation... 1092 */ 1093 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1094 IPV6_HOPOPTS, IPPROTO_IPV6); 1095 if (*mp) 1096 mp = &(*mp)->m_next; 1097 m_freem(ext); 1098 } 1099 } 1100 1101 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1102 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1103 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1104 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1105 1106 /* 1107 * Search for destination options headers or routing 1108 * header(s) through the header chain, and stores each 1109 * header as ancillary data. 1110 * Note that the order of the headers remains in 1111 * the chain of ancillary data. 1112 */ 1113 while (1) { /* is explicit loop prevention necessary? */ 1114 struct ip6_ext *ip6e = NULL; 1115 int elen; 1116 struct mbuf *ext = NULL; 1117 1118 /* 1119 * if it is not an extension header, don't try to 1120 * pull it from the chain. 1121 */ 1122 switch (nxt) { 1123 case IPPROTO_DSTOPTS: 1124 case IPPROTO_ROUTING: 1125 case IPPROTO_HOPOPTS: 1126 case IPPROTO_AH: /* is it possible? */ 1127 break; 1128 default: 1129 goto loopend; 1130 } 1131 1132 ext = ip6_pullexthdr(m, off, nxt); 1133 if (ext == NULL) { 1134 ip6stat.ip6s_tooshort++; 1135 return; 1136 } 1137 ip6e = mtod(ext, struct ip6_ext *); 1138 if (nxt == IPPROTO_AH) 1139 elen = (ip6e->ip6e_len + 2) << 2; 1140 else 1141 elen = (ip6e->ip6e_len + 1) << 3; 1142 if (elen != ext->m_len) { 1143 m_freem(ext); 1144 ip6stat.ip6s_tooshort++; 1145 return; 1146 } 1147 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1148 1149 switch (nxt) { 1150 case IPPROTO_DSTOPTS: 1151 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1152 break; 1153 1154 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1155 IPV6_DSTOPTS, IPPROTO_IPV6); 1156 if (*mp) 1157 mp = &(*mp)->m_next; 1158 break; 1159 1160 case IPPROTO_ROUTING: 1161 if (!in6p->in6p_flags & IN6P_RTHDR) 1162 break; 1163 1164 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1165 IPV6_RTHDR, IPPROTO_IPV6); 1166 if (*mp) 1167 mp = &(*mp)->m_next; 1168 break; 1169 1170 case IPPROTO_HOPOPTS: 1171 case IPPROTO_AH: /* is it possible? */ 1172 break; 1173 1174 default: 1175 /* 1176 * other cases have been filtered in the above. 1177 * none will visit this case. here we supply 1178 * the code just in case (nxt overwritten or 1179 * other cases). 1180 */ 1181 m_freem(ext); 1182 goto loopend; 1183 1184 } 1185 1186 /* proceed with the next header. */ 1187 off += elen; 1188 nxt = ip6e->ip6e_nxt; 1189 ip6e = NULL; 1190 m_freem(ext); 1191 ext = NULL; 1192 } 1193 loopend: 1194 ; 1195 } 1196 } 1197 1198 /* 1199 * pull single extension header from mbuf chain. returns single mbuf that 1200 * contains the result, or NULL on error. 1201 */ 1202 static struct mbuf * 1203 ip6_pullexthdr(m, off, nxt) 1204 struct mbuf *m; 1205 size_t off; 1206 int nxt; 1207 { 1208 struct ip6_ext ip6e; 1209 size_t elen; 1210 struct mbuf *n; 1211 1212 #ifdef DIAGNOSTIC 1213 switch (nxt) { 1214 case IPPROTO_DSTOPTS: 1215 case IPPROTO_ROUTING: 1216 case IPPROTO_HOPOPTS: 1217 case IPPROTO_AH: /* is it possible? */ 1218 break; 1219 default: 1220 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1221 } 1222 #endif 1223 1224 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1225 if (nxt == IPPROTO_AH) 1226 elen = (ip6e.ip6e_len + 2) << 2; 1227 else 1228 elen = (ip6e.ip6e_len + 1) << 3; 1229 1230 MGET(n, M_DONTWAIT, MT_DATA); 1231 if (n && elen >= MLEN) { 1232 MCLGET(n, M_DONTWAIT); 1233 if ((n->m_flags & M_EXT) == 0) { 1234 m_free(n); 1235 n = NULL; 1236 } 1237 } 1238 if (!n) 1239 return NULL; 1240 1241 n->m_len = 0; 1242 if (elen >= M_TRAILINGSPACE(n)) { 1243 m_free(n); 1244 return NULL; 1245 } 1246 1247 m_copydata(m, off, elen, mtod(n, caddr_t)); 1248 n->m_len = elen; 1249 return n; 1250 } 1251 1252 /* 1253 * Get pointer to the previous header followed by the header 1254 * currently processed. 1255 * XXX: This function supposes that 1256 * M includes all headers, 1257 * the next header field and the header length field of each header 1258 * are valid, and 1259 * the sum of each header length equals to OFF. 1260 * Because of these assumptions, this function must be called very 1261 * carefully. Moreover, it will not be used in the near future when 1262 * we develop `neater' mechanism to process extension headers. 1263 */ 1264 u_int8_t * 1265 ip6_get_prevhdr(m, off) 1266 struct mbuf *m; 1267 int off; 1268 { 1269 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1270 1271 if (off == sizeof(struct ip6_hdr)) 1272 return (&ip6->ip6_nxt); 1273 else { 1274 int len, nxt; 1275 struct ip6_ext *ip6e = NULL; 1276 1277 nxt = ip6->ip6_nxt; 1278 len = sizeof(struct ip6_hdr); 1279 while (len < off) { 1280 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1281 1282 switch (nxt) { 1283 case IPPROTO_FRAGMENT: 1284 len += sizeof(struct ip6_frag); 1285 break; 1286 case IPPROTO_AH: 1287 len += (ip6e->ip6e_len + 2) << 2; 1288 break; 1289 default: 1290 len += (ip6e->ip6e_len + 1) << 3; 1291 break; 1292 } 1293 nxt = ip6e->ip6e_nxt; 1294 } 1295 if (ip6e) 1296 return (&ip6e->ip6e_nxt); 1297 else 1298 return NULL; 1299 } 1300 } 1301 1302 /* 1303 * get next header offset. m will be retained. 1304 */ 1305 int 1306 ip6_nexthdr(m, off, proto, nxtp) 1307 struct mbuf *m; 1308 int off; 1309 int proto; 1310 int *nxtp; 1311 { 1312 struct ip6_hdr ip6; 1313 struct ip6_ext ip6e; 1314 struct ip6_frag fh; 1315 1316 /* just in case */ 1317 if (m == NULL) 1318 panic("ip6_nexthdr: m == NULL"); 1319 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1320 return -1; 1321 1322 switch (proto) { 1323 case IPPROTO_IPV6: 1324 if (m->m_pkthdr.len < off + sizeof(ip6)) 1325 return -1; 1326 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1327 if (nxtp) 1328 *nxtp = ip6.ip6_nxt; 1329 off += sizeof(ip6); 1330 return off; 1331 1332 case IPPROTO_FRAGMENT: 1333 /* 1334 * terminate parsing if it is not the first fragment, 1335 * it does not make sense to parse through it. 1336 */ 1337 if (m->m_pkthdr.len < off + sizeof(fh)) 1338 return -1; 1339 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1340 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1341 return -1; 1342 if (nxtp) 1343 *nxtp = fh.ip6f_nxt; 1344 off += sizeof(struct ip6_frag); 1345 return off; 1346 1347 case IPPROTO_AH: 1348 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1349 return -1; 1350 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1351 if (nxtp) 1352 *nxtp = ip6e.ip6e_nxt; 1353 off += (ip6e.ip6e_len + 2) << 2; 1354 if (m->m_pkthdr.len < off) 1355 return -1; 1356 return off; 1357 1358 case IPPROTO_HOPOPTS: 1359 case IPPROTO_ROUTING: 1360 case IPPROTO_DSTOPTS: 1361 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1362 return -1; 1363 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1364 if (nxtp) 1365 *nxtp = ip6e.ip6e_nxt; 1366 off += (ip6e.ip6e_len + 1) << 3; 1367 if (m->m_pkthdr.len < off) 1368 return -1; 1369 return off; 1370 1371 case IPPROTO_NONE: 1372 case IPPROTO_ESP: 1373 case IPPROTO_IPCOMP: 1374 /* give up */ 1375 return -1; 1376 1377 default: 1378 return -1; 1379 } 1380 } 1381 1382 /* 1383 * get offset for the last header in the chain. m will be kept untainted. 1384 */ 1385 int 1386 ip6_lasthdr(m, off, proto, nxtp) 1387 struct mbuf *m; 1388 int off; 1389 int proto; 1390 int *nxtp; 1391 { 1392 int newoff; 1393 int nxt; 1394 1395 if (!nxtp) { 1396 nxt = -1; 1397 nxtp = &nxt; 1398 } 1399 while (1) { 1400 newoff = ip6_nexthdr(m, off, proto, nxtp); 1401 if (newoff < 0) 1402 return off; 1403 else if (newoff < off) 1404 return -1; /* invalid */ 1405 else if (newoff == off) 1406 return newoff; 1407 1408 off = newoff; 1409 proto = *nxtp; 1410 } 1411 } 1412 1413 /* 1414 * System control for IP6 1415 */ 1416 1417 u_char inet6ctlerrmap[PRC_NCMDS] = { 1418 0, 0, 0, 0, 1419 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1420 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1421 EMSGSIZE, EHOSTUNREACH, 0, 0, 1422 0, 0, 0, 0, 1423 ENOPROTOOPT 1424 }; 1425 1426 static int 1427 sysctl_net_inet6_ip6_rht0(SYSCTLFN_ARGS) 1428 { 1429 int error, tmp; 1430 struct sysctlnode node; 1431 1432 node = *rnode; 1433 tmp = ip6_rht0; 1434 node.sysctl_data = &tmp; 1435 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1436 if (error || newp == NULL) 1437 return error; 1438 1439 switch (tmp) { 1440 case -1: /* disable processing */ 1441 case 0: /* disable for host, enable for router */ 1442 case 1: /* enable for all */ 1443 break; 1444 default: 1445 return EINVAL; 1446 } 1447 ip6_rht0 = tmp; 1448 return 0; 1449 } 1450 1451 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1452 { 1453 1454 sysctl_createv(clog, 0, NULL, NULL, 1455 CTLFLAG_PERMANENT, 1456 CTLTYPE_NODE, "net", NULL, 1457 NULL, 0, NULL, 0, 1458 CTL_NET, CTL_EOL); 1459 sysctl_createv(clog, 0, NULL, NULL, 1460 CTLFLAG_PERMANENT, 1461 CTLTYPE_NODE, "inet6", 1462 SYSCTL_DESCR("PF_INET6 related settings"), 1463 NULL, 0, NULL, 0, 1464 CTL_NET, PF_INET6, CTL_EOL); 1465 sysctl_createv(clog, 0, NULL, NULL, 1466 CTLFLAG_PERMANENT, 1467 CTLTYPE_NODE, "ip6", 1468 SYSCTL_DESCR("IPv6 related settings"), 1469 NULL, 0, NULL, 0, 1470 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1471 1472 sysctl_createv(clog, 0, NULL, NULL, 1473 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1474 CTLTYPE_INT, "forwarding", 1475 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1476 NULL, 0, &ip6_forwarding, 0, 1477 CTL_NET, PF_INET6, IPPROTO_IPV6, 1478 IPV6CTL_FORWARDING, CTL_EOL); 1479 sysctl_createv(clog, 0, NULL, NULL, 1480 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1481 CTLTYPE_INT, "redirect", 1482 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1483 NULL, 0, &ip6_sendredirects, 0, 1484 CTL_NET, PF_INET6, IPPROTO_IPV6, 1485 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1486 sysctl_createv(clog, 0, NULL, NULL, 1487 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1488 CTLTYPE_INT, "hlim", 1489 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1490 NULL, 0, &ip6_defhlim, 0, 1491 CTL_NET, PF_INET6, IPPROTO_IPV6, 1492 IPV6CTL_DEFHLIM, CTL_EOL); 1493 #ifdef notyet 1494 sysctl_createv(clog, 0, NULL, NULL, 1495 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1496 CTLTYPE_INT, "mtu", NULL, 1497 NULL, 0, &, 0, 1498 CTL_NET, PF_INET6, IPPROTO_IPV6, 1499 IPV6CTL_DEFMTU, CTL_EOL); 1500 #endif 1501 #ifdef __no_idea__ 1502 sysctl_createv(clog, 0, NULL, NULL, 1503 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1504 CTLTYPE_INT, "forwsrcrt", NULL, 1505 NULL, 0, &?, 0, 1506 CTL_NET, PF_INET6, IPPROTO_IPV6, 1507 IPV6CTL_FORWSRCRT, CTL_EOL); 1508 sysctl_createv(clog, 0, NULL, NULL, 1509 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1510 CTLTYPE_STRUCT, "stats", NULL, 1511 NULL, 0, &?, sizeof(?), 1512 CTL_NET, PF_INET6, IPPROTO_IPV6, 1513 IPV6CTL_STATS, CTL_EOL); 1514 sysctl_createv(clog, 0, NULL, NULL, 1515 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1516 CTLTYPE_STRUCT, "mrtstats", NULL, 1517 NULL, 0, &?, sizeof(?), 1518 CTL_NET, PF_INET6, IPPROTO_IPV6, 1519 IPV6CTL_MRTSTATS, CTL_EOL); 1520 sysctl_createv(clog, 0, NULL, NULL, 1521 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1522 CTLTYPE_?, "mrtproto", NULL, 1523 NULL, 0, &?, sizeof(?), 1524 CTL_NET, PF_INET6, IPPROTO_IPV6, 1525 IPV6CTL_MRTPROTO, CTL_EOL); 1526 #endif 1527 sysctl_createv(clog, 0, NULL, NULL, 1528 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1529 CTLTYPE_INT, "maxfragpackets", 1530 SYSCTL_DESCR("Maximum number of fragments to buffer " 1531 "for reassembly"), 1532 NULL, 0, &ip6_maxfragpackets, 0, 1533 CTL_NET, PF_INET6, IPPROTO_IPV6, 1534 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1535 #ifdef __no_idea__ 1536 sysctl_createv(clog, 0, NULL, NULL, 1537 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1538 CTLTYPE_INT, "sourcecheck", NULL, 1539 NULL, 0, &?, 0, 1540 CTL_NET, PF_INET6, IPPROTO_IPV6, 1541 IPV6CTL_SOURCECHECK, CTL_EOL); 1542 sysctl_createv(clog, 0, NULL, NULL, 1543 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1544 CTLTYPE_INT, "sourcecheck_logint", NULL, 1545 NULL, 0, &?, 0, 1546 CTL_NET, PF_INET6, IPPROTO_IPV6, 1547 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1548 #endif 1549 sysctl_createv(clog, 0, NULL, NULL, 1550 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1551 CTLTYPE_INT, "accept_rtadv", 1552 SYSCTL_DESCR("Accept router advertisements"), 1553 NULL, 0, &ip6_accept_rtadv, 0, 1554 CTL_NET, PF_INET6, IPPROTO_IPV6, 1555 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1556 sysctl_createv(clog, 0, NULL, NULL, 1557 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1558 CTLTYPE_INT, "keepfaith", 1559 SYSCTL_DESCR("Activate faith interface"), 1560 NULL, 0, &ip6_keepfaith, 0, 1561 CTL_NET, PF_INET6, IPPROTO_IPV6, 1562 IPV6CTL_KEEPFAITH, CTL_EOL); 1563 sysctl_createv(clog, 0, NULL, NULL, 1564 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1565 CTLTYPE_INT, "log_interval", 1566 SYSCTL_DESCR("Minumum interval between logging " 1567 "unroutable packets"), 1568 NULL, 0, &ip6_log_interval, 0, 1569 CTL_NET, PF_INET6, IPPROTO_IPV6, 1570 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1571 sysctl_createv(clog, 0, NULL, NULL, 1572 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1573 CTLTYPE_INT, "hdrnestlimit", 1574 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1575 NULL, 0, &ip6_hdrnestlimit, 0, 1576 CTL_NET, PF_INET6, IPPROTO_IPV6, 1577 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1578 sysctl_createv(clog, 0, NULL, NULL, 1579 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1580 CTLTYPE_INT, "dad_count", 1581 SYSCTL_DESCR("Number of Duplicate Address Detection " 1582 "probes to send"), 1583 NULL, 0, &ip6_dad_count, 0, 1584 CTL_NET, PF_INET6, IPPROTO_IPV6, 1585 IPV6CTL_DAD_COUNT, CTL_EOL); 1586 sysctl_createv(clog, 0, NULL, NULL, 1587 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1588 CTLTYPE_INT, "auto_flowlabel", 1589 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1590 NULL, 0, &ip6_auto_flowlabel, 0, 1591 CTL_NET, PF_INET6, IPPROTO_IPV6, 1592 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1593 sysctl_createv(clog, 0, NULL, NULL, 1594 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1595 CTLTYPE_INT, "defmcasthlim", 1596 SYSCTL_DESCR("Default multicast hop limit"), 1597 NULL, 0, &ip6_defmcasthlim, 0, 1598 CTL_NET, PF_INET6, IPPROTO_IPV6, 1599 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1600 #if NGIF > 0 1601 sysctl_createv(clog, 0, NULL, NULL, 1602 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1603 CTLTYPE_INT, "gifhlim", 1604 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1605 NULL, 0, &ip6_gif_hlim, 0, 1606 CTL_NET, PF_INET6, IPPROTO_IPV6, 1607 IPV6CTL_GIF_HLIM, CTL_EOL); 1608 #endif /* NGIF */ 1609 sysctl_createv(clog, 0, NULL, NULL, 1610 CTLFLAG_PERMANENT, 1611 CTLTYPE_STRING, "kame_version", 1612 SYSCTL_DESCR("KAME Version"), 1613 NULL, 0, __KAME_VERSION, 0, 1614 CTL_NET, PF_INET6, IPPROTO_IPV6, 1615 IPV6CTL_KAME_VERSION, CTL_EOL); 1616 sysctl_createv(clog, 0, NULL, NULL, 1617 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1618 CTLTYPE_INT, "use_deprecated", 1619 SYSCTL_DESCR("Allow use of deprecated addresses as " 1620 "source addresses"), 1621 NULL, 0, &ip6_use_deprecated, 0, 1622 CTL_NET, PF_INET6, IPPROTO_IPV6, 1623 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1624 sysctl_createv(clog, 0, NULL, NULL, 1625 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1626 CTLTYPE_INT, "rr_prune", NULL, 1627 NULL, 0, &ip6_rr_prune, 0, 1628 CTL_NET, PF_INET6, IPPROTO_IPV6, 1629 IPV6CTL_RR_PRUNE, CTL_EOL); 1630 sysctl_createv(clog, 0, NULL, NULL, 1631 CTLFLAG_PERMANENT 1632 #ifndef INET6_BINDV6ONLY 1633 |CTLFLAG_READWRITE, 1634 #endif 1635 CTLTYPE_INT, "v6only", 1636 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1637 "to PF_INET sockets"), 1638 NULL, 0, &ip6_v6only, 0, 1639 CTL_NET, PF_INET6, IPPROTO_IPV6, 1640 IPV6CTL_V6ONLY, CTL_EOL); 1641 sysctl_createv(clog, 0, NULL, NULL, 1642 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1643 CTLTYPE_INT, "anonportmin", 1644 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1645 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1646 CTL_NET, PF_INET6, IPPROTO_IPV6, 1647 IPV6CTL_ANONPORTMIN, CTL_EOL); 1648 sysctl_createv(clog, 0, NULL, NULL, 1649 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1650 CTLTYPE_INT, "anonportmax", 1651 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1652 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1653 CTL_NET, PF_INET6, IPPROTO_IPV6, 1654 IPV6CTL_ANONPORTMAX, CTL_EOL); 1655 #ifndef IPNOPRIVPORTS 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1658 CTLTYPE_INT, "lowportmin", 1659 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1660 "to assign"), 1661 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1662 CTL_NET, PF_INET6, IPPROTO_IPV6, 1663 IPV6CTL_LOWPORTMIN, CTL_EOL); 1664 sysctl_createv(clog, 0, NULL, NULL, 1665 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1666 CTLTYPE_INT, "lowportmax", 1667 SYSCTL_DESCR("Highest privileged ephemeral port number " 1668 "to assign"), 1669 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1670 CTL_NET, PF_INET6, IPPROTO_IPV6, 1671 IPV6CTL_LOWPORTMAX, CTL_EOL); 1672 #endif /* IPNOPRIVPORTS */ 1673 sysctl_createv(clog, 0, NULL, NULL, 1674 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1675 CTLTYPE_INT, "maxfrags", 1676 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1677 NULL, 0, &ip6_maxfrags, 0, 1678 CTL_NET, PF_INET6, IPPROTO_IPV6, 1679 IPV6CTL_MAXFRAGS, CTL_EOL); 1680 sysctl_createv(clog, 0, NULL, NULL, 1681 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1682 CTLTYPE_INT, "rht0", 1683 SYSCTL_DESCR("Processing of routing header type 0 (IPv6)"), 1684 sysctl_net_inet6_ip6_rht0, 0, &ip6_rht0, 0, 1685 CTL_NET, PF_INET6, IPPROTO_IPV6, 1686 CTL_CREATE, CTL_EOL); 1687 }
Cache object: 44b7e36f527ab9fbe7e8ad1247df2a14
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