1 /* $NetBSD: ip6_input.c,v 1.8 1999/10/01 10:15:16 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 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 #ifdef __FreeBSD__ 68 #include "opt_ip6fw.h" 69 #endif 70 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 71 #include "opt_inet.h" 72 #ifdef __NetBSD__ /*XXX*/ 73 #include "opt_ipsec.h" 74 #endif 75 #endif 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/malloc.h> 80 #include <sys/mbuf.h> 81 #include <sys/domain.h> 82 #include <sys/protosw.h> 83 #include <sys/socket.h> 84 #include <sys/socketvar.h> 85 #include <sys/errno.h> 86 #include <sys/time.h> 87 #include <sys/kernel.h> 88 #include <sys/syslog.h> 89 #ifdef __NetBSD__ 90 #include <sys/proc.h> 91 #endif 92 93 #include <net/if.h> 94 #include <net/if_types.h> 95 #include <net/if_dl.h> 96 #include <net/route.h> 97 #include <net/netisr.h> 98 99 #include <netinet/in.h> 100 #include <netinet6/in6_var.h> 101 #include <netinet/in_systm.h> 102 #include <netinet6/ip6.h> 103 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 104 #include <netinet6/in6_pcb.h> 105 #else 106 #include <netinet/in_pcb.h> 107 #endif 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/icmp6.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/nd6.h> 112 113 #ifdef INET 114 #include <netinet/ip.h> 115 #include <netinet/ip_icmp.h> 116 #endif /*INET*/ 117 118 #include <netinet6/ip6protosw.h> 119 120 /* we need it for NLOOP. */ 121 #include "loop.h" 122 #include "faith.h" 123 124 #include "gif.h" 125 #include "bpfilter.h" 126 127 extern struct domain inet6domain; 128 extern struct ip6protosw inet6sw[]; 129 #ifdef __bsdi__ 130 extern struct ifnet loif; 131 #endif 132 133 u_char ip6_protox[IPPROTO_MAX]; 134 static int ip6qmaxlen = IFQ_MAXLEN; 135 struct in6_ifaddr *in6_ifaddr; 136 struct ifqueue ip6intrq; 137 138 #ifdef __NetBSD__ 139 extern struct ifnet loif[NLOOP]; 140 int ip6_forward_srcrt; /* XXX */ 141 int ip6_sourcecheck; /* XXX */ 142 int ip6_sourcecheck_interval; /* XXX */ 143 #endif 144 145 struct ip6stat ip6stat; 146 147 static void ip6_init2 __P((void *)); 148 149 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 150 151 /* 152 * IP6 initialization: fill in IP6 protocol switch table. 153 * All protocols not implemented in kernel go to raw IP6 protocol handler. 154 */ 155 void 156 ip6_init() 157 { 158 register struct ip6protosw *pr; 159 register int i; 160 struct timeval tv; 161 162 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 163 if (pr == 0) 164 panic("ip6_init"); 165 for (i = 0; i < IPPROTO_MAX; i++) 166 ip6_protox[i] = pr - inet6sw; 167 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 168 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 169 if (pr->pr_domain->dom_family == PF_INET6 && 170 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 171 ip6_protox[pr->pr_protocol] = pr - inet6sw; 172 ip6intrq.ifq_maxlen = ip6qmaxlen; 173 nd6_init(); 174 frag6_init(); 175 /* 176 * in many cases, random() here does NOT return random number 177 * as initialization during bootstrap time occur in fixed order. 178 */ 179 microtime(&tv); 180 ip6_flow_seq = random() ^ tv.tv_usec; 181 182 ip6_init2((void *)0); 183 } 184 185 static void 186 ip6_init2(dummy) 187 void *dummy; 188 { 189 int i; 190 191 /* 192 * to route local address of p2p link to loopback, 193 * assign loopback address first. 194 */ 195 for (i = 0; i < NLOOP; i++) 196 in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0); 197 198 /* get EUI64 from somewhere, attach pseudo interfaces */ 199 if (in6_ifattach_getifid(NULL) == 0) 200 in6_ifattach_p2p(); 201 202 /* nd6_timer_init */ 203 timeout(nd6_timer, (caddr_t)0, hz); 204 } 205 206 #ifdef __FreeBSD__ 207 /* cheat */ 208 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init2, NULL); 209 #endif 210 211 /* 212 * IP6 input interrupt handling. Just pass the packet to ip6_input. 213 */ 214 void 215 ip6intr() 216 { 217 int s; 218 struct mbuf *m; 219 220 for (;;) { 221 s = splimp(); 222 IF_DEQUEUE(&ip6intrq, m); 223 splx(s); 224 if (m == 0) 225 return; 226 ip6_input(m); 227 } 228 } 229 230 #ifdef __FreeBSD__ 231 NETISR_SET(NETISR_IPV6, ip6intr); 232 #endif 233 234 extern struct route_in6 ip6_forward_rt; 235 236 void 237 ip6_input(m) 238 struct mbuf *m; 239 { 240 register struct ip6_hdr *ip6; 241 int off = sizeof(struct ip6_hdr), nest; 242 u_int32_t plen; 243 u_int32_t rtalert = ~0; 244 int nxt, ours = 0; 245 246 #ifdef IPSEC 247 /* 248 * should the inner packet be considered authentic? 249 * see comment in ah4_input(). 250 */ 251 if (m) { 252 m->m_flags &= ~M_AUTHIPHDR; 253 m->m_flags &= ~M_AUTHIPDGM; 254 } 255 #endif 256 /* 257 * mbuf statistics by kazu 258 */ 259 if (m->m_flags & M_EXT) { 260 if (m->m_next) 261 ip6stat.ip6s_mext2m++; 262 else 263 ip6stat.ip6s_mext1++; 264 } else { 265 if (m->m_next) { 266 if (m->m_flags & M_LOOP) 267 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 268 else if (m->m_pkthdr.rcvif->if_index <= 31) 269 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 270 else 271 ip6stat.ip6s_m2m[0]++; 272 } else 273 ip6stat.ip6s_m1++; 274 } 275 276 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 277 278 ip6stat.ip6s_total++; 279 280 if (m->m_len < sizeof(struct ip6_hdr) && 281 (m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 282 ip6stat.ip6s_toosmall++; 283 return; 284 } 285 286 ip6 = mtod(m, struct ip6_hdr *); 287 288 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 289 ip6stat.ip6s_badvers++; 290 goto bad; 291 } 292 293 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 294 295 /* 296 * Scope check 297 */ 298 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 299 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 300 ip6stat.ip6s_badscope++; 301 goto bad; 302 } 303 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 304 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 305 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 306 ours = 1; 307 goto hbhcheck; 308 } else { 309 ip6stat.ip6s_badscope++; 310 goto bad; 311 } 312 } 313 314 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 315 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 316 ours = 1; 317 goto hbhcheck; 318 } 319 } else { 320 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 321 ip6->ip6_src.s6_addr16[1] 322 = htons(m->m_pkthdr.rcvif->if_index); 323 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 324 ip6->ip6_dst.s6_addr16[1] 325 = htons(m->m_pkthdr.rcvif->if_index); 326 } 327 328 /* 329 * Multicast check 330 */ 331 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 332 struct in6_multi *in6m = 0; 333 /* 334 * See if we belong to the destination multicast group on the 335 * arrival interface. 336 */ 337 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 338 if (in6m) 339 ours = 1; 340 else if (!ip6_mrouter) { 341 ip6stat.ip6s_notmember++; 342 ip6stat.ip6s_cantforward++; 343 goto bad; 344 } 345 goto hbhcheck; 346 } 347 348 /* 349 * Unicast check 350 */ 351 if (ip6_forward_rt.ro_rt == 0 || 352 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 353 &ip6_forward_rt.ro_dst.sin6_addr)) { 354 if (ip6_forward_rt.ro_rt) { 355 RTFREE(ip6_forward_rt.ro_rt); 356 ip6_forward_rt.ro_rt = 0; 357 } 358 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 359 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 360 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 361 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 362 363 #if defined(__bsdi__) || defined(__NetBSD__) 364 rtalloc((struct route *)&ip6_forward_rt); 365 #endif 366 #ifdef __FreeBSD__ 367 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); 368 #endif 369 } 370 371 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 372 373 /* 374 * Accept the packet if the forwarding interface to the destination 375 * according to the routing table is the loopback interface, 376 * unless the associated route has a gateway. 377 * Note that this approach causes to accept a packet if there is a 378 * route to the loopback interface for the destination of the packet. 379 * But we think it's even useful in some situations, e.g. when using 380 * a special daemon which wants to intercept the packet. 381 */ 382 if (ip6_forward_rt.ro_rt && 383 (ip6_forward_rt.ro_rt->rt_flags & 384 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 385 #if 0 386 /* 387 * The check below is redundant since the comparison of 388 * the destination and the key of the rtentry has 389 * already done through looking up the routing table. 390 */ 391 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 392 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 393 #endif 394 #ifdef __bsdi__ 395 ip6_foward.rt.ro_rt->rt_ifp == &loif 396 #else 397 ip6_forward_rt.ro_rt->rt_ifp == &loif[0] 398 #endif 399 ) { 400 struct in6_ifaddr *ia6 = 401 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 402 /* packet to tentative address must not be received */ 403 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 404 m->m_flags |= M_ANYCAST6; 405 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 406 /* this interface is ready */ 407 ours = 1; 408 goto hbhcheck; 409 } else { 410 /* this interface is not ready, fall through */ 411 } 412 } 413 414 /* 415 * FAITH(Firewall Aided Internet Translator) 416 */ 417 #if defined(NFAITH) && 0 < NFAITH 418 if (ip6_keepfaith) { 419 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 420 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 421 /* XXX do we need more sanity checks? */ 422 ours = 1; 423 goto hbhcheck; 424 } 425 } 426 #endif 427 428 /* 429 * Now there is no reason to process the packet if it's not our own 430 * and we're not a router. 431 */ 432 if (!ip6_forwarding) { 433 ip6stat.ip6s_cantforward++; 434 goto bad; 435 } 436 437 hbhcheck: 438 /* 439 * Process Hop-by-Hop options header if it's contained. 440 * m may be modified in ip6_hopopts_input(). 441 * If a JumboPayload option is included, plen will also be modified. 442 */ 443 plen = (u_int32_t)ntohs(ip6->ip6_plen); 444 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 445 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) 446 return; /* m have already been freed */ 447 /* adjust pointer */ 448 ip6 = mtod(m, struct ip6_hdr *); 449 nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; 450 451 /* 452 * accept the packet if a router alert option is included 453 * and we act as an IPv6 router. 454 */ 455 if (rtalert != ~0 && ip6_forwarding) 456 ours = 1; 457 } else 458 nxt = ip6->ip6_nxt; 459 460 /* 461 * Check that the amount of data in the buffers 462 * is as at least much as the IPv6 header would have us expect. 463 * Trim mbufs if longer than we expect. 464 * Drop packet if shorter than we expect. 465 */ 466 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 467 ip6stat.ip6s_tooshort++; 468 goto bad; 469 } 470 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 471 if (m->m_len == m->m_pkthdr.len) { 472 m->m_len = sizeof(struct ip6_hdr) + plen; 473 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 474 } else 475 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 476 } 477 478 /* 479 * Forward if desirable. 480 */ 481 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 482 /* 483 * If we are acting as a multicast router, all 484 * incoming multicast packets are passed to the 485 * kernel-level multicast forwarding function. 486 * The packet is returned (relatively) intact; if 487 * ip6_mforward() returns a non-zero value, the packet 488 * must be discarded, else it may be accepted below. 489 */ 490 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 491 ip6stat.ip6s_cantforward++; 492 m_freem(m); 493 return; 494 } 495 if (!ours) { 496 m_freem(m); 497 return; 498 } 499 } 500 else if (!ours) { 501 ip6_forward(m, 0); 502 return; 503 } 504 505 /* 506 * Tell launch routine the next header 507 */ 508 ip6stat.ip6s_delivered++; 509 nest = 0; 510 while (nxt != IPPROTO_DONE) { 511 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 512 ip6stat.ip6s_toomanyhdr++; 513 goto bad; 514 } 515 516 /* 517 * protection against faulty packet - there should be 518 * more sanity checks in header chain processing. 519 */ 520 if (m->m_pkthdr.len < off) { 521 ip6stat.ip6s_tooshort++; 522 goto bad; 523 } 524 525 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 526 } 527 return; 528 bad: 529 m_freem(m); 530 } 531 532 /* 533 * Hop-by-Hop options header processing. If a valid jumbo payload option is 534 * included, the real payload length will be stored in plenp. 535 */ 536 static int 537 ip6_hopopts_input(plenp, rtalertp, mp, offp) 538 u_int32_t *plenp; 539 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 540 struct mbuf **mp; 541 int *offp; 542 { 543 register struct mbuf *m = *mp; 544 int off = *offp, hbhlen; 545 struct ip6_hbh *hbh; 546 u_int8_t *opt; 547 548 /* validation of the length of the header */ 549 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 550 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 551 hbhlen = (hbh->ip6h_len + 1) << 3; 552 553 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 554 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 555 off += hbhlen; 556 hbhlen -= sizeof(struct ip6_hbh); 557 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 558 559 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 560 hbhlen, rtalertp, plenp) < 0) 561 return(-1); 562 563 *offp = off; 564 *mp = m; 565 return(0); 566 } 567 568 /* 569 * Search header for all Hop-by-hop options and process each option. 570 * This function is separate from ip6_hopopts_input() in order to 571 * handle a case where the sending node itself process its hop-by-hop 572 * options header. In such a case, the function is called from ip6_output(). 573 */ 574 int 575 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 576 struct mbuf *m; 577 u_int8_t *opthead; 578 int hbhlen; 579 u_int32_t *rtalertp; 580 u_int32_t *plenp; 581 { 582 struct ip6_hdr *ip6; 583 int optlen = 0; 584 u_int8_t *opt = opthead; 585 u_int16_t rtalert_val; 586 587 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 588 switch(*opt) { 589 case IP6OPT_PAD1: 590 optlen = 1; 591 break; 592 case IP6OPT_PADN: 593 if (hbhlen < IP6OPT_MINLEN) { 594 ip6stat.ip6s_toosmall++; 595 goto bad; 596 } 597 optlen = *(opt + 1) + 2; 598 break; 599 case IP6OPT_RTALERT: 600 /* XXX may need check for alignment */ 601 if (hbhlen < IP6OPT_RTALERT_LEN) { 602 ip6stat.ip6s_toosmall++; 603 goto bad; 604 } 605 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 606 /* XXX: should we discard the packet? */ 607 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 608 *(opt + 1)); 609 optlen = IP6OPT_RTALERT_LEN; 610 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 611 *rtalertp = ntohs(rtalert_val); 612 break; 613 case IP6OPT_JUMBO: 614 /* XXX may need check for alignment */ 615 if (hbhlen < IP6OPT_JUMBO_LEN) { 616 ip6stat.ip6s_toosmall++; 617 goto bad; 618 } 619 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 620 /* XXX: should we discard the packet? */ 621 log(LOG_ERR, "length of jumbopayload opt " 622 "is inconsistent(%d)", 623 *(opt + 1)); 624 optlen = IP6OPT_JUMBO_LEN; 625 626 /* 627 * We can simply cast because of the alignment 628 * requirement of the jumbo payload option. 629 */ 630 #if 0 631 *plenp = ntohl(*(u_int32_t *)(opt + 2)); 632 #else 633 bcopy(opt + 2, plenp, sizeof(*plenp)); 634 *plenp = htonl(*plenp); 635 #endif 636 if (*plenp <= IPV6_MAXPACKET) { 637 /* 638 * jumbo payload length must be larger 639 * than 65535 640 */ 641 ip6stat.ip6s_badoptions++; 642 icmp6_error(m, ICMP6_PARAM_PROB, 643 ICMP6_PARAMPROB_HEADER, 644 sizeof(struct ip6_hdr) + 645 sizeof(struct ip6_hbh) + 646 opt + 2 - opthead); 647 return(-1); 648 } 649 650 ip6 = mtod(m, struct ip6_hdr *); 651 if (ip6->ip6_plen) { 652 /* 653 * IPv6 packets that have non 0 payload length 654 * must not contain a jumbo paylod option. 655 */ 656 ip6stat.ip6s_badoptions++; 657 icmp6_error(m, ICMP6_PARAM_PROB, 658 ICMP6_PARAMPROB_HEADER, 659 sizeof(struct ip6_hdr) + 660 sizeof(struct ip6_hbh) + 661 opt - opthead); 662 return(-1); 663 } 664 break; 665 default: /* unknown option */ 666 if (hbhlen < IP6OPT_MINLEN) { 667 ip6stat.ip6s_toosmall++; 668 goto bad; 669 } 670 if ((optlen = ip6_unknown_opt(opt, m, 671 sizeof(struct ip6_hdr) + 672 sizeof(struct ip6_hbh) + 673 opt - opthead)) == -1) 674 return(-1); 675 optlen += 2; 676 break; 677 } 678 } 679 680 return(0); 681 682 bad: 683 m_freem(m); 684 return(-1); 685 } 686 687 /* 688 * Unknown option processing. 689 * The third argument `off' is the offset from the IPv6 header to the option, 690 * which is necessary if the IPv6 header the and option header and IPv6 header 691 * is not continuous in order to return an ICMPv6 error. 692 */ 693 int 694 ip6_unknown_opt(optp, m, off) 695 u_int8_t *optp; 696 struct mbuf *m; 697 int off; 698 { 699 struct ip6_hdr *ip6; 700 701 switch(IP6OPT_TYPE(*optp)) { 702 case IP6OPT_TYPE_SKIP: /* ignore the option */ 703 return((int)*(optp + 1)); 704 case IP6OPT_TYPE_DISCARD: /* silently discard */ 705 m_freem(m); 706 return(-1); 707 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 708 ip6stat.ip6s_badoptions++; 709 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 710 return(-1); 711 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 712 ip6stat.ip6s_badoptions++; 713 ip6 = mtod(m, struct ip6_hdr *); 714 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 715 (m->m_flags & (M_BCAST|M_MCAST))) 716 m_freem(m); 717 else 718 icmp6_error(m, ICMP6_PARAM_PROB, 719 ICMP6_PARAMPROB_OPTION, off); 720 return(-1); 721 } 722 723 m_freem(m); /* XXX: NOTREACHED */ 724 return(-1); 725 } 726 727 /* 728 * Create the "control" list for this pcb 729 */ 730 void 731 ip6_savecontrol(in6p, mp, ip6, m) 732 register struct in6pcb *in6p; 733 register struct mbuf **mp; 734 register struct ip6_hdr *ip6; 735 register struct mbuf *m; 736 { 737 #ifdef __NetBSD__ 738 struct proc *p = curproc; /* XXX */ 739 #endif 740 #ifdef __bsdi__ 741 # define sbcreatecontrol so_cmsg 742 #endif 743 744 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 745 struct timeval tv; 746 747 microtime(&tv); 748 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 749 SCM_TIMESTAMP, SOL_SOCKET); 750 if (*mp) 751 mp = &(*mp)->m_next; 752 } 753 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 754 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 755 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 756 IPPROTO_IPV6); 757 if (*mp) 758 mp = &(*mp)->m_next; 759 } 760 761 #ifdef noyet 762 /* options were tossed above */ 763 if (in6p->in6p_flags & IN6P_RECVOPTS) 764 /* broken */ 765 /* ip6_srcroute doesn't do what we want here, need to fix */ 766 if (in6p->in6p_flags & IPV6P_RECVRETOPTS) 767 /* broken */ 768 #endif 769 770 /* RFC 2292 sec. 5 */ 771 if (in6p->in6p_flags & IN6P_PKTINFO) { 772 struct in6_pktinfo pi6; 773 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 774 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 775 pi6.ipi6_addr.s6_addr16[1] = 0; 776 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 777 ? m->m_pkthdr.rcvif->if_index 778 : 0; 779 *mp = sbcreatecontrol((caddr_t) &pi6, 780 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 781 IPPROTO_IPV6); 782 if (*mp) 783 mp = &(*mp)->m_next; 784 } 785 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 786 int hlim = ip6->ip6_hlim & 0xff; 787 *mp = sbcreatecontrol((caddr_t) &hlim, 788 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 789 if (*mp) 790 mp = &(*mp)->m_next; 791 } 792 /* IN6P_NEXTHOP - for outgoing packet only */ 793 794 /* 795 * IPV6_HOPOPTS socket option. We require super-user privilege 796 * for the option, but it might be too strict, since there might 797 * be some hop-by-hop options which can be returned to normal user. 798 * See RFC 2292 section 6. 799 */ 800 if ((in6p->in6p_flags & IN6P_HOPOPTS) && 801 p && !suser(p->p_ucred, &p->p_acflag)) { 802 /* 803 * Check if a hop-by-hop options header is contatined in the 804 * received packet, and if so, store the options as ancillary 805 * data. Note that a hop-by-hop options header must be 806 * just after the IPv6 header, which fact is assured through 807 * the IPv6 input processing. 808 */ 809 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 810 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 811 struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); 812 813 /* 814 * XXX: We copy whole the header even if a jumbo 815 * payload option is included, which option is to 816 * be removed before returning in the RFC 2292. 817 * But it's too painful operation... 818 */ 819 *mp = sbcreatecontrol((caddr_t)hbh, 820 (hbh->ip6h_len + 1) << 3, 821 IPV6_HOPOPTS, IPPROTO_IPV6); 822 if (*mp) 823 mp = &(*mp)->m_next; 824 } 825 } 826 827 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 828 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 829 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 830 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 831 832 /* 833 * Search for destination options headers or routing 834 * header(s) through the header chain, and stores each 835 * header as ancillary data. 836 * Note that the order of the headers remains in 837 * the chain of ancillary data. 838 */ 839 while(1) { /* is explicit loop prevention necessary? */ 840 struct ip6_ext *ip6e = 841 (struct ip6_ext *)(mtod(m, caddr_t) + off); 842 843 switch(nxt) { 844 case IPPROTO_DSTOPTS: 845 if (!in6p->in6p_flags & IN6P_DSTOPTS) 846 break; 847 848 /* 849 * We also require super-user privilege for 850 * the option. 851 * See the comments on IN6_HOPOPTS. 852 */ 853 if (!p || !suser(p->p_ucred, &p->p_acflag)) 854 break; 855 856 *mp = sbcreatecontrol((caddr_t)ip6e, 857 (ip6e->ip6e_len + 1) << 3, 858 IPV6_DSTOPTS, 859 IPPROTO_IPV6); 860 if (*mp) 861 mp = &(*mp)->m_next; 862 break; 863 864 case IPPROTO_ROUTING: 865 if (!in6p->in6p_flags & IN6P_RTHDR) 866 break; 867 868 *mp = sbcreatecontrol((caddr_t)ip6e, 869 (ip6e->ip6e_len + 1) << 3, 870 IPV6_RTHDR, 871 IPPROTO_IPV6); 872 if (*mp) 873 mp = &(*mp)->m_next; 874 break; 875 876 case IPPROTO_UDP: 877 case IPPROTO_TCP: 878 case IPPROTO_ICMPV6: 879 default: 880 /* 881 * stop search if we encounter an upper 882 * layer protocol headers. 883 */ 884 goto loopend; 885 886 case IPPROTO_HOPOPTS: 887 case IPPROTO_AH: /* is it possible? */ 888 break; 889 } 890 891 /* proceed with the next header. */ 892 if (nxt == IPPROTO_AH) 893 off += (ip6e->ip6e_len + 2) << 2; 894 else 895 off += (ip6e->ip6e_len + 1) << 3; 896 nxt = ip6e->ip6e_nxt; 897 } 898 loopend: 899 } 900 if ((in6p->in6p_flags & IN6P_HOPOPTS) 901 && p && !suser(p->p_ucred, &p->p_acflag)) { 902 /* to be done */ 903 } 904 if ((in6p->in6p_flags & IN6P_DSTOPTS) 905 && p && !suser(p->p_ucred, &p->p_acflag)) { 906 /* to be done */ 907 } 908 /* IN6P_RTHDR - to be done */ 909 910 #ifdef __bsdi__ 911 # undef sbcreatecontrol 912 #endif 913 } 914 915 /* 916 * Get pointer to the previous header followed by the header 917 * currently processed. 918 * XXX: This function supposes that 919 * M includes all headers, 920 * the next header field and the header length field of each header 921 * are valid, and 922 * the sum of each header length equals to OFF. 923 * Because of these assumptions, this function must be called very 924 * carefully. Moreover, it will not be used in the near future when 925 * we develop `neater' mechanism to process extension headers. 926 */ 927 char * 928 ip6_get_prevhdr(m, off) 929 struct mbuf *m; 930 int off; 931 { 932 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 933 934 if (off == sizeof(struct ip6_hdr)) 935 return(&ip6->ip6_nxt); 936 else { 937 int len, nxt; 938 struct ip6_ext *ip6e = NULL; 939 940 nxt = ip6->ip6_nxt; 941 len = sizeof(struct ip6_hdr); 942 while (len < off) { 943 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 944 945 switch(nxt) { 946 case IPPROTO_FRAGMENT: 947 len += sizeof(struct ip6_frag); 948 break; 949 case IPPROTO_AH: 950 len += (ip6e->ip6e_len + 2) << 2; 951 break; 952 default: 953 len += (ip6e->ip6e_len + 1) << 3; 954 break; 955 } 956 nxt = ip6e->ip6e_nxt; 957 } 958 if (ip6e) 959 return(&ip6e->ip6e_nxt); 960 else 961 return NULL; 962 } 963 } 964 965 /* 966 * System control for IP6 967 */ 968 969 u_char inet6ctlerrmap[PRC_NCMDS] = { 970 0, 0, 0, 0, 971 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 972 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 973 EMSGSIZE, EHOSTUNREACH, 0, 0, 974 0, 0, 0, 0, 975 ENOPROTOOPT 976 }; 977 978 #ifdef __NetBSD__ 979 #include <vm/vm.h> 980 #include <sys/sysctl.h> 981 982 int 983 ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 984 int *name; 985 u_int namelen; 986 void *oldp; 987 size_t *oldlenp; 988 void *newp; 989 size_t newlen; 990 { 991 /* All sysctl names at this level are terminal. */ 992 if (namelen != 1) 993 return ENOTDIR; 994 995 switch (name[0]) { 996 997 case IPV6CTL_FORWARDING: 998 return sysctl_int(oldp, oldlenp, newp, newlen, 999 &ip6_forwarding); 1000 case IPV6CTL_SENDREDIRECTS: 1001 return sysctl_int(oldp, oldlenp, newp, newlen, 1002 &ip6_sendredirects); 1003 case IPV6CTL_DEFHLIM: 1004 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim); 1005 case IPV6CTL_MAXFRAGPACKETS: 1006 return sysctl_int(oldp, oldlenp, newp, newlen, 1007 &ip6_maxfragpackets); 1008 case IPV6CTL_ACCEPT_RTADV: 1009 return sysctl_int(oldp, oldlenp, newp, newlen, 1010 &ip6_accept_rtadv); 1011 case IPV6CTL_KEEPFAITH: 1012 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith); 1013 case IPV6CTL_LOG_INTERVAL: 1014 return sysctl_int(oldp, oldlenp, newp, newlen, 1015 &ip6_log_interval); 1016 case IPV6CTL_HDRNESTLIMIT: 1017 return sysctl_int(oldp, oldlenp, newp, newlen, 1018 &ip6_hdrnestlimit); 1019 case IPV6CTL_DAD_COUNT: 1020 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count); 1021 case IPV6CTL_AUTO_FLOWLABEL: 1022 return sysctl_int(oldp, oldlenp, newp, newlen, 1023 &ip6_auto_flowlabel); 1024 case IPV6CTL_DEFMCASTHLIM: 1025 return sysctl_int(oldp, oldlenp, newp, newlen, 1026 &ip6_defmcasthlim); 1027 case IPV6CTL_GIF_HLIM: 1028 return sysctl_int(oldp, oldlenp, newp, newlen, 1029 &ip6_gif_hlim); 1030 case IPV6CTL_KAME_VERSION: 1031 return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION); 1032 default: 1033 return EOPNOTSUPP; 1034 } 1035 /* NOTREACHED */ 1036 } 1037 #endif /* __NetBSD__ */ 1038