ip6_input.c revision 53541
1/* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/sys/netinet6/ip6_input.c 53541 1999-11-22 02:45:11Z shin $ 30 */ 31 32/* 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 65 */ 66 67#include "opt_ip6fw.h" 68#include "opt_inet.h" 69#include "opt_ipsec.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 85#include <net/if.h> 86#include <net/if_types.h> 87#include <net/if_dl.h> 88#include <net/route.h> 89#include <net/netisr.h> 90 91#include <netinet/in.h> 92#include <netinet/in_systm.h> 93#ifdef INET 94#include <netinet/ip.h> 95#include <netinet/ip_icmp.h> 96#endif /*INET*/ 97#include <netinet/in_pcb.h> 98#include <netinet6/in6_var.h> 99#include <netinet6/ip6.h> 100#include <netinet6/ip6_var.h> 101#include <netinet6/icmp6.h> 102#include <netinet6/in6_ifattach.h> 103#include <netinet6/nd6.h> 104#include <netinet6/in6_prefix.h> 105 106#ifdef IPV6FIREWALL 107#include <netinet6/ip6_fw.h> 108#endif 109 110#ifdef ALTQ 111#include <netinet/altq_cdnr.h> 112#endif 113 114#include <netinet6/ip6protosw.h> 115 116/* we need it for NLOOP. */ 117#include "loop.h" 118/* #include "faith.h" */ 119 120/* #include "gif.h" */ 121 122#include <net/net_osdep.h> 123 124extern struct domain inet6domain; 125extern struct ip6protosw inet6sw[]; 126 127u_char ip6_protox[IPPROTO_MAX]; 128static int ip6qmaxlen = IFQ_MAXLEN; 129struct in6_ifaddr *in6_ifaddr; 130struct ifqueue ip6intrq; 131 132int ip6_forward_srcrt; /* XXX */ 133int ip6_sourcecheck; /* XXX */ 134int ip6_sourcecheck_interval; /* XXX */ 135 136#ifdef IPV6FIREWALL 137/* firewall hooks */ 138ip6_fw_chk_t *ip6_fw_chk_ptr; 139ip6_fw_ctl_t *ip6_fw_ctl_ptr; 140#endif 141 142struct ip6stat ip6stat; 143 144static void ip6_init2 __P((void *)); 145 146static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 147 148#if defined(PTR) 149extern int ip6_protocol_tr; 150 151int ptr_in6 __P((struct mbuf *, struct mbuf **)); 152extern void ip_forward __P((struct mbuf *, int)); 153#endif 154 155/* 156 * IP6 initialization: fill in IP6 protocol switch table. 157 * All protocols not implemented in kernel go to raw IP6 protocol handler. 158 */ 159void 160ip6_init() 161{ 162 register struct ip6protosw *pr; 163 register int i; 164 struct timeval tv; 165 166 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 167 if (pr == 0) 168 panic("ip6_init"); 169 for (i = 0; i < IPPROTO_MAX; i++) 170 ip6_protox[i] = pr - inet6sw; 171 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 172 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 173 if (pr->pr_domain->dom_family == PF_INET6 && 174 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 175 ip6_protox[pr->pr_protocol] = pr - inet6sw; 176 ip6intrq.ifq_maxlen = ip6qmaxlen; 177 nd6_init(); 178 frag6_init(); 179#ifdef IPV6FIREWALL 180 ip6_fw_init(); 181#endif 182 /* 183 * in many cases, random() here does NOT return random number 184 * as initialization during bootstrap time occur in fixed order. 185 */ 186 microtime(&tv); 187 ip6_flow_seq = random() ^ tv.tv_usec; 188} 189 190static void 191ip6_init2(dummy) 192 void *dummy; 193{ 194 int i; 195 int ret; 196 197 /* get EUI64 from somewhere */ 198 ret = in6_ifattach_getifid(NULL); 199 200 /* 201 * to route local address of p2p link to loopback, 202 * assign loopback address first. 203 */ 204 for (i = 0; i < NLOOP; i++) 205 in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0); 206 207 /* attach pseudo interfaces */ 208 if (ret == 0) 209 in6_ifattach_p2p(); 210 211 /* nd6_timer_init */ 212 timeout(nd6_timer, (caddr_t)0, hz); 213 /* router renumbering prefix list maintenance */ 214 timeout(in6_rr_timer, (caddr_t)0, hz); 215} 216 217/* cheat */ 218SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL); 219 220/* 221 * IP6 input interrupt handling. Just pass the packet to ip6_input. 222 */ 223void 224ip6intr() 225{ 226 int s; 227 struct mbuf *m; 228 229 for (;;) { 230 s = splimp(); 231 IF_DEQUEUE(&ip6intrq, m); 232 splx(s); 233 if (m == 0) 234 return; 235 ip6_input(m); 236 } 237} 238 239NETISR_SET(NETISR_IPV6, ip6intr); 240 241extern struct route_in6 ip6_forward_rt; 242 243void 244ip6_input(m) 245 struct mbuf *m; 246{ 247 struct ip6_hdr *ip6; 248 int off = sizeof(struct ip6_hdr), nest; 249 u_int32_t plen; 250 u_int32_t rtalert = ~0; 251 int nxt, ours = 0; 252 struct ifnet *deliverifp = NULL; 253 254#ifdef IPSEC 255 /* 256 * should the inner packet be considered authentic? 257 * see comment in ah4_input(). 258 */ 259 if (m) { 260 m->m_flags &= ~M_AUTHIPHDR; 261 m->m_flags &= ~M_AUTHIPDGM; 262 } 263#endif 264 265 /* 266 * mbuf statistics by kazu 267 */ 268 if (m->m_flags & M_EXT) { 269 if (m->m_next) 270 ip6stat.ip6s_mext2m++; 271 else 272 ip6stat.ip6s_mext1++; 273 } else { 274 if (m->m_next) { 275 if (m->m_flags & M_LOOP) { 276 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 277 } else if (m->m_pkthdr.rcvif->if_index <= 31) 278 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 279 else 280 ip6stat.ip6s_m2m[0]++; 281 } else 282 ip6stat.ip6s_m1++; 283 } 284 285 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 286 ip6stat.ip6s_total++; 287 288 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 289 290 if (m->m_len < sizeof(struct ip6_hdr)) { 291 struct ifnet *inifp; 292 inifp = m->m_pkthdr.rcvif; 293 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 294 ip6stat.ip6s_toosmall++; 295 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 296 return; 297 } 298 } 299 300 ip6 = mtod(m, struct ip6_hdr *); 301 302 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 303 ip6stat.ip6s_badvers++; 304 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 305 goto bad; 306 } 307 308 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 309 310#ifdef IPV6FIREWALL 311 /* 312 * Check with the firewall... 313 */ 314 if (ip6_fw_chk_ptr) { 315 u_short port = 0; 316 /* If ipfw says divert, we have to just drop packet */ 317 /* use port as a dummy argument */ 318 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { 319 m_freem(m); 320 m = NULL; 321 } 322 if (!m) 323 return; 324 } 325#endif 326 327#ifdef ALTQ 328 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 329 /* packet is dropped by traffic conditioner */ 330 return; 331 } 332#endif 333 334 /* 335 * Scope check 336 */ 337 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 338 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 339 ip6stat.ip6s_badscope++; 340 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 341 goto bad; 342 } 343 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 344 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 345 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 346 ours = 1; 347 deliverifp = m->m_pkthdr.rcvif; 348 goto hbhcheck; 349 } else { 350 ip6stat.ip6s_badscope++; 351 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 352 goto bad; 353 } 354 } 355 356 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 357 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 358 ours = 1; 359 deliverifp = m->m_pkthdr.rcvif; 360 goto hbhcheck; 361 } 362 } else { 363 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 364 ip6->ip6_src.s6_addr16[1] 365 = htons(m->m_pkthdr.rcvif->if_index); 366 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 367 ip6->ip6_dst.s6_addr16[1] 368 = htons(m->m_pkthdr.rcvif->if_index); 369 } 370 371#if defined(PTR) 372 /* 373 * 374 */ 375 if (ip6_protocol_tr) 376 { 377 struct mbuf *m1 = NULL; 378 379 switch (ptr_in6(m, &m1)) 380 { 381 case IPPROTO_IP: goto mcastcheck; 382 case IPPROTO_IPV4: ip_forward(m1, 0); break; 383 case IPPROTO_IPV6: ip6_forward(m1, 0); break; 384 case IPPROTO_MAX: /* discard this packet */ 385 default: 386 } 387 388 if (m != m1) 389 m_freem(m); 390 391 return; 392 } 393 394 mcastcheck: 395#endif 396 397 /* 398 * Multicast check 399 */ 400 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 401 struct in6_multi *in6m = 0; 402 403 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 404 /* 405 * See if we belong to the destination multicast group on the 406 * arrival interface. 407 */ 408 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 409 if (in6m) 410 ours = 1; 411 else { 412 ip6stat.ip6s_notmember++; 413 ip6stat.ip6s_cantforward++; 414 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 415 goto bad; 416 } 417 deliverifp = m->m_pkthdr.rcvif; 418 goto hbhcheck; 419 } 420 421 /* 422 * Unicast check 423 */ 424 if (ip6_forward_rt.ro_rt == 0 || 425 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 426 &ip6_forward_rt.ro_dst.sin6_addr)) { 427 if (ip6_forward_rt.ro_rt) { 428 RTFREE(ip6_forward_rt.ro_rt); 429 ip6_forward_rt.ro_rt = 0; 430 } 431 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 432 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 433 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 434 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 435 436 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); 437 } 438 439#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 440 441 /* 442 * Accept the packet if the forwarding interface to the destination 443 * according to the routing table is the loopback interface, 444 * unless the associated route has a gateway. 445 * Note that this approach causes to accept a packet if there is a 446 * route to the loopback interface for the destination of the packet. 447 * But we think it's even useful in some situations, e.g. when using 448 * a special daemon which wants to intercept the packet. 449 */ 450 if (ip6_forward_rt.ro_rt && 451 (ip6_forward_rt.ro_rt->rt_flags & 452 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 453 /* 454 * The comparison of the destination and the key of the rtentry 455 * has already done through looking up the routing table, 456 * so no need to do such a comparison here again. 457 */ 458 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 459 struct in6_ifaddr *ia6 = 460 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 461 /* packet to tentative address must not be received */ 462 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 463 m->m_flags |= M_ANYCAST6; 464 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 465 /* this interface is ready */ 466 ours = 1; 467 deliverifp = ia6->ia_ifp; /* correct? */ 468 goto hbhcheck; 469 } else { 470 /* this interface is not ready, fall through */ 471 } 472 } 473 474 /* 475 * FAITH(Firewall Aided Internet Translator) 476 */ 477#if defined(NFAITH) && 0 < NFAITH 478 if (ip6_keepfaith) { 479 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 480 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 481 /* XXX do we need more sanity checks? */ 482 ours = 1; 483 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ 484 goto hbhcheck; 485 } 486 } 487#endif 488 489 /* 490 * Now there is no reason to process the packet if it's not our own 491 * and we're not a router. 492 */ 493 if (!ip6_forwarding) { 494 ip6stat.ip6s_cantforward++; 495 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 496 goto bad; 497 } 498 499 hbhcheck: 500 /* 501 * Process Hop-by-Hop options header if it's contained. 502 * m may be modified in ip6_hopopts_input(). 503 * If a JumboPayload option is included, plen will also be modified. 504 */ 505 plen = (u_int32_t)ntohs(ip6->ip6_plen); 506 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 507 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 508 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 509 return; /* m have already been freed */ 510 } 511 /* adjust pointer */ 512 ip6 = mtod(m, struct ip6_hdr *); 513 nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; 514 515 /* 516 * accept the packet if a router alert option is included 517 * and we act as an IPv6 router. 518 */ 519 if (rtalert != ~0 && ip6_forwarding) 520 ours = 1; 521 } else 522 nxt = ip6->ip6_nxt; 523 524 /* 525 * Check that the amount of data in the buffers 526 * is as at least much as the IPv6 header would have us expect. 527 * Trim mbufs if longer than we expect. 528 * Drop packet if shorter than we expect. 529 */ 530 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 531 ip6stat.ip6s_tooshort++; 532 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 533 goto bad; 534 } 535 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 536 if (m->m_len == m->m_pkthdr.len) { 537 m->m_len = sizeof(struct ip6_hdr) + plen; 538 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 539 } else 540 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 541 } 542 543 /* 544 * Forward if desirable. 545 */ 546 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 547 if (!ours) { 548 m_freem(m); 549 return; 550 } 551 } else if (!ours) { 552 ip6_forward(m, 0); 553 return; 554 } 555 556 /* 557 * Tell launch routine the next header 558 */ 559#if defined(__NetBSD__) && defined(IFA_STATS) 560 if (IFA_STATS && deliverifp != NULL) { 561 struct in6_ifaddr *ia6; 562 ip6 = mtod(m, struct ip6_hdr *); 563 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 564 if (ia6) 565 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 566 } 567#endif 568 ip6stat.ip6s_delivered++; 569 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 570 nest = 0; 571 while (nxt != IPPROTO_DONE) { 572 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 573 ip6stat.ip6s_toomanyhdr++; 574 goto bad; 575 } 576 577 /* 578 * protection against faulty packet - there should be 579 * more sanity checks in header chain processing. 580 */ 581 if (m->m_pkthdr.len < off) { 582 ip6stat.ip6s_tooshort++; 583 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 584 goto bad; 585 } 586 587 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 588 } 589 return; 590 bad: 591 m_freem(m); 592} 593 594/* 595 * Hop-by-Hop options header processing. If a valid jumbo payload option is 596 * included, the real payload length will be stored in plenp. 597 */ 598static int 599ip6_hopopts_input(plenp, rtalertp, mp, offp) 600 u_int32_t *plenp; 601 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 602 struct mbuf **mp; 603 int *offp; 604{ 605 register struct mbuf *m = *mp; 606 int off = *offp, hbhlen; 607 struct ip6_hbh *hbh; 608 u_int8_t *opt; 609 610 /* validation of the length of the header */ 611 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 612 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 613 hbhlen = (hbh->ip6h_len + 1) << 3; 614 615 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 616 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 617 off += hbhlen; 618 hbhlen -= sizeof(struct ip6_hbh); 619 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 620 621 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 622 hbhlen, rtalertp, plenp) < 0) 623 return(-1); 624 625 *offp = off; 626 *mp = m; 627 return(0); 628} 629 630/* 631 * Search header for all Hop-by-hop options and process each option. 632 * This function is separate from ip6_hopopts_input() in order to 633 * handle a case where the sending node itself process its hop-by-hop 634 * options header. In such a case, the function is called from ip6_output(). 635 */ 636int 637ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 638 struct mbuf *m; 639 u_int8_t *opthead; 640 int hbhlen; 641 u_int32_t *rtalertp; 642 u_int32_t *plenp; 643{ 644 struct ip6_hdr *ip6; 645 int optlen = 0; 646 u_int8_t *opt = opthead; 647 u_int16_t rtalert_val; 648 649 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 650 switch(*opt) { 651 case IP6OPT_PAD1: 652 optlen = 1; 653 break; 654 case IP6OPT_PADN: 655 if (hbhlen < IP6OPT_MINLEN) { 656 ip6stat.ip6s_toosmall++; 657 goto bad; 658 } 659 optlen = *(opt + 1) + 2; 660 break; 661 case IP6OPT_RTALERT: 662 /* XXX may need check for alignment */ 663 if (hbhlen < IP6OPT_RTALERT_LEN) { 664 ip6stat.ip6s_toosmall++; 665 goto bad; 666 } 667 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 668 /* XXX: should we discard the packet? */ 669 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 670 *(opt + 1)); 671 optlen = IP6OPT_RTALERT_LEN; 672 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 673 *rtalertp = ntohs(rtalert_val); 674 break; 675 case IP6OPT_JUMBO: 676 /* XXX may need check for alignment */ 677 if (hbhlen < IP6OPT_JUMBO_LEN) { 678 ip6stat.ip6s_toosmall++; 679 goto bad; 680 } 681 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 682 /* XXX: should we discard the packet? */ 683 log(LOG_ERR, "length of jumbopayload opt " 684 "is inconsistent(%d)", 685 *(opt + 1)); 686 optlen = IP6OPT_JUMBO_LEN; 687 688 bcopy(opt + 2, plenp, sizeof(*plenp)); 689 *plenp = htonl(*plenp); 690 if (*plenp <= IPV6_MAXPACKET) { 691 /* 692 * jumbo payload length must be larger 693 * than 65535 694 */ 695 ip6stat.ip6s_badoptions++; 696 icmp6_error(m, ICMP6_PARAM_PROB, 697 ICMP6_PARAMPROB_HEADER, 698 sizeof(struct ip6_hdr) + 699 sizeof(struct ip6_hbh) + 700 opt + 2 - opthead); 701 return(-1); 702 } 703 704 ip6 = mtod(m, struct ip6_hdr *); 705 if (ip6->ip6_plen) { 706 /* 707 * IPv6 packets that have non 0 payload length 708 * must not contain a jumbo paylod option. 709 */ 710 ip6stat.ip6s_badoptions++; 711 icmp6_error(m, ICMP6_PARAM_PROB, 712 ICMP6_PARAMPROB_HEADER, 713 sizeof(struct ip6_hdr) + 714 sizeof(struct ip6_hbh) + 715 opt - opthead); 716 return(-1); 717 } 718 break; 719 default: /* unknown option */ 720 if (hbhlen < IP6OPT_MINLEN) { 721 ip6stat.ip6s_toosmall++; 722 goto bad; 723 } 724 if ((optlen = ip6_unknown_opt(opt, m, 725 sizeof(struct ip6_hdr) + 726 sizeof(struct ip6_hbh) + 727 opt - opthead)) == -1) 728 return(-1); 729 optlen += 2; 730 break; 731 } 732 } 733 734 return(0); 735 736 bad: 737 m_freem(m); 738 return(-1); 739} 740 741/* 742 * Unknown option processing. 743 * The third argument `off' is the offset from the IPv6 header to the option, 744 * which is necessary if the IPv6 header the and option header and IPv6 header 745 * is not continuous in order to return an ICMPv6 error. 746 */ 747int 748ip6_unknown_opt(optp, m, off) 749 u_int8_t *optp; 750 struct mbuf *m; 751 int off; 752{ 753 struct ip6_hdr *ip6; 754 755 switch(IP6OPT_TYPE(*optp)) { 756 case IP6OPT_TYPE_SKIP: /* ignore the option */ 757 return((int)*(optp + 1)); 758 case IP6OPT_TYPE_DISCARD: /* silently discard */ 759 m_freem(m); 760 return(-1); 761 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 762 ip6stat.ip6s_badoptions++; 763 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 764 return(-1); 765 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 766 ip6stat.ip6s_badoptions++; 767 ip6 = mtod(m, struct ip6_hdr *); 768 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 769 (m->m_flags & (M_BCAST|M_MCAST))) 770 m_freem(m); 771 else 772 icmp6_error(m, ICMP6_PARAM_PROB, 773 ICMP6_PARAMPROB_OPTION, off); 774 return(-1); 775 } 776 777 m_freem(m); /* XXX: NOTREACHED */ 778 return(-1); 779} 780 781/* 782 * Create the "control" list for this pcb 783 */ 784void 785ip6_savecontrol(in6p, mp, ip6, m) 786 register struct inpcb *in6p; 787 register struct mbuf **mp; 788 register struct ip6_hdr *ip6; 789 register struct mbuf *m; 790{ 791 struct proc *p = curproc; /* XXX */ 792 int privileged; 793 794 privileged = 0; 795 if (p && !suser(p)) 796 privileged++; 797 798#ifdef SO_TIMESTAMP 799 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 800 struct timeval tv; 801 802 microtime(&tv); 803 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 804 SCM_TIMESTAMP, SOL_SOCKET); 805 if (*mp) 806 mp = &(*mp)->m_next; 807 } 808#endif 809 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 810 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 811 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 812 IPPROTO_IPV6); 813 if (*mp) 814 mp = &(*mp)->m_next; 815 } 816 817 /* RFC 2292 sec. 5 */ 818 if (in6p->in6p_flags & IN6P_PKTINFO) { 819 struct in6_pktinfo pi6; 820 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 821 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 822 pi6.ipi6_addr.s6_addr16[1] = 0; 823 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 824 ? m->m_pkthdr.rcvif->if_index 825 : 0; 826 *mp = sbcreatecontrol((caddr_t) &pi6, 827 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 828 IPPROTO_IPV6); 829 if (*mp) 830 mp = &(*mp)->m_next; 831 } 832 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 833 int hlim = ip6->ip6_hlim & 0xff; 834 *mp = sbcreatecontrol((caddr_t) &hlim, 835 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 836 if (*mp) 837 mp = &(*mp)->m_next; 838 } 839 /* IN6P_NEXTHOP - for outgoing packet only */ 840 841 /* 842 * IPV6_HOPOPTS socket option. We require super-user privilege 843 * for the option, but it might be too strict, since there might 844 * be some hop-by-hop options which can be returned to normal user. 845 * See RFC 2292 section 6. 846 */ 847 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 848 /* 849 * Check if a hop-by-hop options header is contatined in the 850 * received packet, and if so, store the options as ancillary 851 * data. Note that a hop-by-hop options header must be 852 * just after the IPv6 header, which fact is assured through 853 * the IPv6 input processing. 854 */ 855 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 856 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 857 struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); 858 859 /* 860 * XXX: We copy whole the header even if a jumbo 861 * payload option is included, which option is to 862 * be removed before returning in the RFC 2292. 863 * But it's too painful operation... 864 */ 865 *mp = sbcreatecontrol((caddr_t)hbh, 866 (hbh->ip6h_len + 1) << 3, 867 IPV6_HOPOPTS, IPPROTO_IPV6); 868 if (*mp) 869 mp = &(*mp)->m_next; 870 } 871 } 872 873 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 874 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 875 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 876 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 877 878 /* 879 * Search for destination options headers or routing 880 * header(s) through the header chain, and stores each 881 * header as ancillary data. 882 * Note that the order of the headers remains in 883 * the chain of ancillary data. 884 */ 885 while(1) { /* is explicit loop prevention necessary? */ 886 struct ip6_ext *ip6e = 887 (struct ip6_ext *)(mtod(m, caddr_t) + off); 888 889 switch(nxt) { 890 case IPPROTO_DSTOPTS: 891 if (!in6p->in6p_flags & IN6P_DSTOPTS) 892 break; 893 894 /* 895 * We also require super-user privilege for 896 * the option. 897 * See the comments on IN6_HOPOPTS. 898 */ 899 if (!privileged) 900 break; 901 902 *mp = sbcreatecontrol((caddr_t)ip6e, 903 (ip6e->ip6e_len + 1) << 3, 904 IPV6_DSTOPTS, 905 IPPROTO_IPV6); 906 if (*mp) 907 mp = &(*mp)->m_next; 908 break; 909 910 case IPPROTO_ROUTING: 911 if (!in6p->in6p_flags & IN6P_RTHDR) 912 break; 913 914 *mp = sbcreatecontrol((caddr_t)ip6e, 915 (ip6e->ip6e_len + 1) << 3, 916 IPV6_RTHDR, 917 IPPROTO_IPV6); 918 if (*mp) 919 mp = &(*mp)->m_next; 920 break; 921 922 case IPPROTO_UDP: 923 case IPPROTO_TCP: 924 case IPPROTO_ICMPV6: 925 default: 926 /* 927 * stop search if we encounter an upper 928 * layer protocol headers. 929 */ 930 goto loopend; 931 932 case IPPROTO_HOPOPTS: 933 case IPPROTO_AH: /* is it possible? */ 934 break; 935 } 936 937 /* proceed with the next header. */ 938 if (nxt == IPPROTO_AH) 939 off += (ip6e->ip6e_len + 2) << 2; 940 else 941 off += (ip6e->ip6e_len + 1) << 3; 942 nxt = ip6e->ip6e_nxt; 943 } 944 loopend: 945 } 946 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 947 /* to be done */ 948 } 949 if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { 950 /* to be done */ 951 } 952 /* IN6P_RTHDR - to be done */ 953} 954 955/* 956 * Get pointer to the previous header followed by the header 957 * currently processed. 958 * XXX: This function supposes that 959 * M includes all headers, 960 * the next header field and the header length field of each header 961 * are valid, and 962 * the sum of each header length equals to OFF. 963 * Because of these assumptions, this function must be called very 964 * carefully. Moreover, it will not be used in the near future when 965 * we develop `neater' mechanism to process extension headers. 966 */ 967char * 968ip6_get_prevhdr(m, off) 969 struct mbuf *m; 970 int off; 971{ 972 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 973 974 if (off == sizeof(struct ip6_hdr)) 975 return(&ip6->ip6_nxt); 976 else { 977 int len, nxt; 978 struct ip6_ext *ip6e = NULL; 979 980 nxt = ip6->ip6_nxt; 981 len = sizeof(struct ip6_hdr); 982 while (len < off) { 983 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 984 985 switch(nxt) { 986 case IPPROTO_FRAGMENT: 987 len += sizeof(struct ip6_frag); 988 break; 989 case IPPROTO_AH: 990 len += (ip6e->ip6e_len + 2) << 2; 991 break; 992 default: 993 len += (ip6e->ip6e_len + 1) << 3; 994 break; 995 } 996 nxt = ip6e->ip6e_nxt; 997 } 998 if (ip6e) 999 return(&ip6e->ip6e_nxt); 1000 else 1001 return NULL; 1002 } 1003} 1004 1005/* 1006 * System control for IP6 1007 */ 1008 1009u_char inet6ctlerrmap[PRC_NCMDS] = { 1010 0, 0, 0, 0, 1011 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1012 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1013 EMSGSIZE, EHOSTUNREACH, 0, 0, 1014 0, 0, 0, 0, 1015 ENOPROTOOPT 1016}; 1017