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 * $FreeBSD$ 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_ipsec.h" 68 #include "opt_ip6fw.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/domain.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/errno.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/proc.h> 83 84 #include <net/if.h> 85 #include <net/if_types.h> 86 #include <net/if_dl.h> 87 #include <net/route.h> 88 #include <net/netisr.h> 89 #include <net/intrq.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_systm.h> 93 #include <netinet/ip.h> 94 #include <netinet/ip_icmp.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet6/in6_var.h> 97 #include <netinet6/ip6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/icmp6.h> 100 #include <netinet6/in6_ifattach.h> 101 #include <netinet6/nd6.h> 102 #include <netinet6/in6_prefix.h> 103 104 #ifdef IPV6FIREWALL 105 #include <netinet6/ip6_fw.h> 106 #endif 107 108 #ifdef ALTQ 109 #include <netinet/altq_cdnr.h> 110 #endif 111 112 #include <netinet6/ip6protosw.h> 113 114 /* we need it for NLOOP. */ 115 #include "loop.h" 116 117 #include "faith.h" 118 #include "gif.h" 119 120 #include <net/net_osdep.h> 121 122 extern struct domain inet6domain; 123 extern struct ip6protosw inet6sw[]; 124 125 u_char ip6_protox[IPPROTO_MAX]; 126 static int ip6qmaxlen = IFQ_MAXLEN; 127 struct in6_ifaddr *in6_ifaddr; 128 129 int ip6_forward_srcrt; /* XXX */ 130 int ip6_sourcecheck; /* XXX */ 131 int ip6_sourcecheck_interval; /* XXX */ 132 133 const int int6intrq_present = 1; 134 135 #ifdef IPV6FIREWALL 136 /* firewall hooks */ 137 ip6_fw_chk_t *ip6_fw_chk_ptr; 138 ip6_fw_ctl_t *ip6_fw_ctl_ptr; 139 #endif 140 141 struct ip6stat ip6stat; 142 143 static void ip6_init2 __P((void *)); 144 145 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 146 147 #if defined(PTR) 148 extern int ip6_protocol_tr; 149 150 int ptr_in6 __P((struct mbuf *, struct mbuf **)); 151 extern void ip_forward __P((struct mbuf *, int)); 152 #endif 153 154 /* 155 * IP6 initialization: fill in IP6 protocol switch table. 156 * All protocols not implemented in kernel go to raw IP6 protocol handler. 157 */ 158 void 159 ip6_init() 160 { 161 register struct ip6protosw *pr; 162 register int i; 163 struct timeval tv; 164 165 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 166 if (pr == 0) 167 panic("ip6_init"); 168 for (i = 0; i < IPPROTO_MAX; i++) 169 ip6_protox[i] = pr - inet6sw; 170 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 171 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 172 if (pr->pr_domain->dom_family == PF_INET6 && 173 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 174 ip6_protox[pr->pr_protocol] = pr - inet6sw; 175 ip6intrq.ifq_maxlen = ip6qmaxlen; 176 register_netisr(NETISR_IPV6, ip6intr); 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 } 189 190 static void 191 ip6_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 */ 218 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 219 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 220 221 /* 222 * IP6 input interrupt handling. Just pass the packet to ip6_input. 223 */ 224 void 225 ip6intr() 226 { 227 int s; 228 struct mbuf *m; 229 230 for (;;) { 231 s = splimp(); 232 IF_DEQUEUE(&ip6intrq, m); 233 splx(s); 234 if (m == 0) 235 return; 236 ip6_input(m); 237 } 238 } 239 240 extern struct route_in6 ip6_forward_rt; 241 242 void 243 ip6_input(m) 244 struct mbuf *m; 245 { 246 struct ip6_hdr *ip6; 247 int off = sizeof(struct ip6_hdr), nest; 248 u_int32_t plen; 249 u_int32_t rtalert = ~0; 250 int nxt, ours = 0; 251 struct ifnet *deliverifp = NULL; 252 253 #ifdef IPSEC 254 /* 255 * should the inner packet be considered authentic? 256 * see comment in ah4_input(). 257 */ 258 if (m) { 259 m->m_flags &= ~M_AUTHIPHDR; 260 m->m_flags &= ~M_AUTHIPDGM; 261 } 262 #endif 263 264 /* 265 * mbuf statistics by kazu 266 */ 267 if (m->m_flags & M_EXT) { 268 if (m->m_next) 269 ip6stat.ip6s_mext2m++; 270 else 271 ip6stat.ip6s_mext1++; 272 } else { 273 if (m->m_next) { 274 if (m->m_flags & M_LOOP) { 275 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 276 } else if (m->m_pkthdr.rcvif->if_index <= 31) 277 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 278 else 279 ip6stat.ip6s_m2m[0]++; 280 } else 281 ip6stat.ip6s_m1++; 282 } 283 284 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 285 ip6stat.ip6s_total++; 286 287 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 288 289 if (m->m_len < sizeof(struct ip6_hdr)) { 290 struct ifnet *inifp; 291 inifp = m->m_pkthdr.rcvif; 292 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 293 ip6stat.ip6s_toosmall++; 294 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 295 return; 296 } 297 } 298 299 ip6 = mtod(m, struct ip6_hdr *); 300 301 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 302 ip6stat.ip6s_badvers++; 303 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 304 goto bad; 305 } 306 307 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 308 309 #ifdef IPV6FIREWALL 310 /* 311 * Check with the firewall... 312 */ 313 if (ip6_fw_chk_ptr) { 314 u_short port = 0; 315 /* If ipfw says divert, we have to just drop packet */ 316 /* use port as a dummy argument */ 317 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { 318 m_freem(m); 319 m = NULL; 320 } 321 if (!m) 322 return; 323 } 324 #endif 325 326 #ifdef ALTQ 327 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 328 /* packet is dropped by traffic conditioner */ 329 return; 330 } 331 #endif 332 333 /* 334 * Scope check 335 */ 336 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 337 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 338 ip6stat.ip6s_badscope++; 339 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 340 goto bad; 341 } 342 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 343 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 344 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 345 ip6stat.ip6s_badscope++; 346 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 347 goto bad; 348 } 349 } 350 351 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 352 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 353 ours = 1; 354 deliverifp = m->m_pkthdr.rcvif; 355 goto hbhcheck; 356 } 357 } else { 358 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 359 ip6->ip6_src.s6_addr16[1] 360 = htons(m->m_pkthdr.rcvif->if_index); 361 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 362 ip6->ip6_dst.s6_addr16[1] 363 = htons(m->m_pkthdr.rcvif->if_index); 364 } 365 366 #if defined(PTR) 367 /* 368 * 369 */ 370 if (ip6_protocol_tr) 371 { 372 struct mbuf *m1 = NULL; 373 374 switch (ptr_in6(m, &m1)) 375 { 376 case IPPROTO_IP: goto mcastcheck; 377 case IPPROTO_IPV4: ip_forward(m1, 0); break; 378 case IPPROTO_IPV6: ip6_forward(m1, 0); break; 379 case IPPROTO_MAX: /* discard this packet */ 380 default: 381 } 382 383 if (m != m1) 384 m_freem(m); 385 386 return; 387 } 388 389 mcastcheck: 390 #endif 391 392 /* 393 * Multicast check 394 */ 395 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 396 struct in6_multi *in6m = 0; 397 398 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 399 /* 400 * See if we belong to the destination multicast group on the 401 * arrival interface. 402 */ 403 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 404 if (in6m) 405 ours = 1; 406 else if (!ip6_mrouter) { 407 ip6stat.ip6s_notmember++; 408 ip6stat.ip6s_cantforward++; 409 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 410 goto bad; 411 } 412 deliverifp = m->m_pkthdr.rcvif; 413 goto hbhcheck; 414 } 415 416 /* 417 * Unicast check 418 */ 419 if (ip6_forward_rt.ro_rt == 0 || 420 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 421 &ip6_forward_rt.ro_dst.sin6_addr)) { 422 if (ip6_forward_rt.ro_rt) { 423 RTFREE(ip6_forward_rt.ro_rt); 424 ip6_forward_rt.ro_rt = 0; 425 } 426 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 427 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 428 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 429 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 430 431 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); 432 } 433 434 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 435 436 /* 437 * Accept the packet if the forwarding interface to the destination 438 * according to the routing table is the loopback interface, 439 * unless the associated route has a gateway. 440 * Note that this approach causes to accept a packet if there is a 441 * route to the loopback interface for the destination of the packet. 442 * But we think it's even useful in some situations, e.g. when using 443 * a special daemon which wants to intercept the packet. 444 */ 445 if (ip6_forward_rt.ro_rt && 446 (ip6_forward_rt.ro_rt->rt_flags & 447 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 448 /* 449 * The comparison of the destination and the key of the rtentry 450 * has already done through looking up the routing table, 451 * so no need to do such a comparison here again. 452 */ 453 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 454 struct in6_ifaddr *ia6 = 455 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 456 /* packet to tentative address must not be received */ 457 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 458 m->m_flags |= M_ANYCAST6; 459 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 460 /* this interface is ready */ 461 ours = 1; 462 deliverifp = ia6->ia_ifp; /* correct? */ 463 goto hbhcheck; 464 } else { 465 /* this interface is not ready, fall through */ 466 } 467 } 468 469 /* 470 * FAITH(Firewall Aided Internet Translator) 471 */ 472 #if defined(NFAITH) && 0 < NFAITH 473 if (ip6_keepfaith) { 474 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 475 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 476 /* XXX do we need more sanity checks? */ 477 ours = 1; 478 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ 479 goto hbhcheck; 480 } 481 } 482 #endif 483 484 /* 485 * Now there is no reason to process the packet if it's not our own 486 * and we're not a router. 487 */ 488 if (!ip6_forwarding) { 489 ip6stat.ip6s_cantforward++; 490 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 491 goto bad; 492 } 493 494 hbhcheck: 495 /* 496 * Process Hop-by-Hop options header if it's contained. 497 * m may be modified in ip6_hopopts_input(). 498 * If a JumboPayload option is included, plen will also be modified. 499 */ 500 plen = (u_int32_t)ntohs(ip6->ip6_plen); 501 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 502 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 503 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 504 return; /* m have already been freed */ 505 } 506 /* adjust pointer */ 507 ip6 = mtod(m, struct ip6_hdr *); 508 nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; 509 510 /* 511 * accept the packet if a router alert option is included 512 * and we act as an IPv6 router. 513 */ 514 if (rtalert != ~0 && ip6_forwarding) 515 ours = 1; 516 } else 517 nxt = ip6->ip6_nxt; 518 519 /* 520 * Check that the amount of data in the buffers 521 * is as at least much as the IPv6 header would have us expect. 522 * Trim mbufs if longer than we expect. 523 * Drop packet if shorter than we expect. 524 */ 525 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 526 ip6stat.ip6s_tooshort++; 527 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 528 goto bad; 529 } 530 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 531 if (m->m_len == m->m_pkthdr.len) { 532 m->m_len = sizeof(struct ip6_hdr) + plen; 533 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 534 } else 535 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 536 } 537 538 /* 539 * Forward if desirable. 540 */ 541 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 542 /* 543 * If we are acting as a multicast router, all 544 * incoming multicast packets are passed to the 545 * kernel-level multicast forwarding function. 546 * The packet is returned (relatively) intact; if 547 * ip6_mforward() returns a non-zero value, the packet 548 * must be discarded, else it may be accepted below. 549 */ 550 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 551 ip6stat.ip6s_cantforward++; 552 m_freem(m); 553 return; 554 } 555 if (!ours) { 556 m_freem(m); 557 return; 558 } 559 } else if (!ours) { 560 ip6_forward(m, 0); 561 return; 562 } 563 564 /* 565 * Tell launch routine the next header 566 */ 567 #if defined(__NetBSD__) && defined(IFA_STATS) 568 if (IFA_STATS && deliverifp != NULL) { 569 struct in6_ifaddr *ia6; 570 ip6 = mtod(m, struct ip6_hdr *); 571 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 572 if (ia6) 573 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 574 } 575 #endif 576 ip6stat.ip6s_delivered++; 577 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 578 nest = 0; 579 while (nxt != IPPROTO_DONE) { 580 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 581 ip6stat.ip6s_toomanyhdr++; 582 goto bad; 583 } 584 585 /* 586 * protection against faulty packet - there should be 587 * more sanity checks in header chain processing. 588 */ 589 if (m->m_pkthdr.len < off) { 590 ip6stat.ip6s_tooshort++; 591 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 592 goto bad; 593 } 594 595 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 596 } 597 return; 598 bad: 599 m_freem(m); 600 } 601 602 /* 603 * Hop-by-Hop options header processing. If a valid jumbo payload option is 604 * included, the real payload length will be stored in plenp. 605 */ 606 static int 607 ip6_hopopts_input(plenp, rtalertp, mp, offp) 608 u_int32_t *plenp; 609 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 610 struct mbuf **mp; 611 int *offp; 612 { 613 register struct mbuf *m = *mp; 614 int off = *offp, hbhlen; 615 struct ip6_hbh *hbh; 616 u_int8_t *opt; 617 618 /* validation of the length of the header */ 619 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 620 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 621 hbhlen = (hbh->ip6h_len + 1) << 3; 622 623 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 624 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 625 off += hbhlen; 626 hbhlen -= sizeof(struct ip6_hbh); 627 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 628 629 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 630 hbhlen, rtalertp, plenp) < 0) 631 return(-1); 632 633 *offp = off; 634 *mp = m; 635 return(0); 636 } 637 638 /* 639 * Search header for all Hop-by-hop options and process each option. 640 * This function is separate from ip6_hopopts_input() in order to 641 * handle a case where the sending node itself process its hop-by-hop 642 * options header. In such a case, the function is called from ip6_output(). 643 */ 644 int 645 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 646 struct mbuf *m; 647 u_int8_t *opthead; 648 int hbhlen; 649 u_int32_t *rtalertp; 650 u_int32_t *plenp; 651 { 652 struct ip6_hdr *ip6; 653 int optlen = 0; 654 u_int8_t *opt = opthead; 655 u_int16_t rtalert_val; 656 657 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 658 switch(*opt) { 659 case IP6OPT_PAD1: 660 optlen = 1; 661 break; 662 case IP6OPT_PADN: 663 if (hbhlen < IP6OPT_MINLEN) { 664 ip6stat.ip6s_toosmall++; 665 goto bad; 666 } 667 optlen = *(opt + 1) + 2; 668 break; 669 case IP6OPT_RTALERT: 670 /* XXX may need check for alignment */ 671 if (hbhlen < IP6OPT_RTALERT_LEN) { 672 ip6stat.ip6s_toosmall++; 673 goto bad; 674 } 675 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 676 /* XXX: should we discard the packet? */ 677 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 678 *(opt + 1)); 679 optlen = IP6OPT_RTALERT_LEN; 680 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 681 *rtalertp = ntohs(rtalert_val); 682 break; 683 case IP6OPT_JUMBO: 684 /* XXX may need check for alignment */ 685 if (hbhlen < IP6OPT_JUMBO_LEN) { 686 ip6stat.ip6s_toosmall++; 687 goto bad; 688 } 689 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 690 /* XXX: should we discard the packet? */ 691 log(LOG_ERR, "length of jumbopayload opt " 692 "is inconsistent(%d)", 693 *(opt + 1)); 694 optlen = IP6OPT_JUMBO_LEN; 695 696 bcopy(opt + 2, plenp, sizeof(*plenp)); 697 *plenp = htonl(*plenp); 698 if (*plenp <= IPV6_MAXPACKET) { 699 /* 700 * jumbo payload length must be larger 701 * than 65535 702 */ 703 ip6stat.ip6s_badoptions++; 704 icmp6_error(m, ICMP6_PARAM_PROB, 705 ICMP6_PARAMPROB_HEADER, 706 sizeof(struct ip6_hdr) + 707 sizeof(struct ip6_hbh) + 708 opt + 2 - opthead); 709 return(-1); 710 } 711 712 ip6 = mtod(m, struct ip6_hdr *); 713 if (ip6->ip6_plen) { 714 /* 715 * IPv6 packets that have non 0 payload length 716 * must not contain a jumbo paylod option. 717 */ 718 ip6stat.ip6s_badoptions++; 719 icmp6_error(m, ICMP6_PARAM_PROB, 720 ICMP6_PARAMPROB_HEADER, 721 sizeof(struct ip6_hdr) + 722 sizeof(struct ip6_hbh) + 723 opt - opthead); 724 return(-1); 725 } 726 break; 727 default: /* unknown option */ 728 if (hbhlen < IP6OPT_MINLEN) { 729 ip6stat.ip6s_toosmall++; 730 goto bad; 731 } 732 if ((optlen = ip6_unknown_opt(opt, m, 733 sizeof(struct ip6_hdr) + 734 sizeof(struct ip6_hbh) + 735 opt - opthead)) == -1) 736 return(-1); 737 optlen += 2; 738 break; 739 } 740 } 741 742 return(0); 743 744 bad: 745 m_freem(m); 746 return(-1); 747 } 748 749 /* 750 * Unknown option processing. 751 * The third argument `off' is the offset from the IPv6 header to the option, 752 * which is necessary if the IPv6 header the and option header and IPv6 header 753 * is not continuous in order to return an ICMPv6 error. 754 */ 755 int 756 ip6_unknown_opt(optp, m, off) 757 u_int8_t *optp; 758 struct mbuf *m; 759 int off; 760 { 761 struct ip6_hdr *ip6; 762 763 switch(IP6OPT_TYPE(*optp)) { 764 case IP6OPT_TYPE_SKIP: /* ignore the option */ 765 return((int)*(optp + 1)); 766 case IP6OPT_TYPE_DISCARD: /* silently discard */ 767 m_freem(m); 768 return(-1); 769 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 770 ip6stat.ip6s_badoptions++; 771 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 772 return(-1); 773 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 774 ip6stat.ip6s_badoptions++; 775 ip6 = mtod(m, struct ip6_hdr *); 776 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 777 (m->m_flags & (M_BCAST|M_MCAST))) 778 m_freem(m); 779 else 780 icmp6_error(m, ICMP6_PARAM_PROB, 781 ICMP6_PARAMPROB_OPTION, off); 782 return(-1); 783 } 784 785 m_freem(m); /* XXX: NOTREACHED */ 786 return(-1); 787 } 788 789 /* 790 * Create the "control" list for this pcb 791 */ 792 void 793 ip6_savecontrol(in6p, mp, ip6, m) 794 register struct inpcb *in6p; 795 register struct mbuf **mp; 796 register struct ip6_hdr *ip6; 797 register struct mbuf *m; 798 { 799 struct proc *p = curproc; /* XXX */ 800 int privileged; 801 802 privileged = 0; 803 if (p && !suser(p)) 804 privileged++; 805 806 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 807 struct timeval tv; 808 809 microtime(&tv); 810 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 811 SCM_TIMESTAMP, SOL_SOCKET); 812 if (*mp) 813 mp = &(*mp)->m_next; 814 } 815 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 816 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 817 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 818 IPPROTO_IPV6); 819 if (*mp) 820 mp = &(*mp)->m_next; 821 } 822 823 /* RFC 2292 sec. 5 */ 824 if (in6p->in6p_flags & IN6P_PKTINFO) { 825 struct in6_pktinfo pi6; 826 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 827 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 828 pi6.ipi6_addr.s6_addr16[1] = 0; 829 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 830 ? m->m_pkthdr.rcvif->if_index 831 : 0; 832 *mp = sbcreatecontrol((caddr_t) &pi6, 833 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 834 IPPROTO_IPV6); 835 if (*mp) 836 mp = &(*mp)->m_next; 837 } 838 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 839 int hlim = ip6->ip6_hlim & 0xff; 840 *mp = sbcreatecontrol((caddr_t) &hlim, 841 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 842 if (*mp) 843 mp = &(*mp)->m_next; 844 } 845 /* IN6P_NEXTHOP - for outgoing packet only */ 846 847 /* 848 * IPV6_HOPOPTS socket option. We require super-user privilege 849 * for the option, but it might be too strict, since there might 850 * be some hop-by-hop options which can be returned to normal user. 851 * See RFC 2292 section 6. 852 */ 853 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 854 /* 855 * Check if a hop-by-hop options header is contatined in the 856 * received packet, and if so, store the options as ancillary 857 * data. Note that a hop-by-hop options header must be 858 * just after the IPv6 header, which fact is assured through 859 * the IPv6 input processing. 860 */ 861 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 862 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 863 struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); 864 865 /* 866 * XXX: We copy whole the header even if a jumbo 867 * payload option is included, which option is to 868 * be removed before returning in the RFC 2292. 869 * But it's too painful operation... 870 */ 871 *mp = sbcreatecontrol((caddr_t)hbh, 872 (hbh->ip6h_len + 1) << 3, 873 IPV6_HOPOPTS, IPPROTO_IPV6); 874 if (*mp) 875 mp = &(*mp)->m_next; 876 } 877 } 878 879 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 880 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 881 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 882 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 883 884 /* 885 * Search for destination options headers or routing 886 * header(s) through the header chain, and stores each 887 * header as ancillary data. 888 * Note that the order of the headers remains in 889 * the chain of ancillary data. 890 */ 891 while(1) { /* is explicit loop prevention necessary? */ 892 struct ip6_ext *ip6e = 893 (struct ip6_ext *)(mtod(m, caddr_t) + off); 894 895 switch(nxt) { 896 case IPPROTO_DSTOPTS: 897 if (!in6p->in6p_flags & IN6P_DSTOPTS) 898 break; 899 900 /* 901 * We also require super-user privilege for 902 * the option. 903 * See the comments on IN6_HOPOPTS. 904 */ 905 if (!privileged) 906 break; 907 908 *mp = sbcreatecontrol((caddr_t)ip6e, 909 (ip6e->ip6e_len + 1) << 3, 910 IPV6_DSTOPTS, 911 IPPROTO_IPV6); 912 if (*mp) 913 mp = &(*mp)->m_next; 914 break; 915 916 case IPPROTO_ROUTING: 917 if (!in6p->in6p_flags & IN6P_RTHDR) 918 break; 919 920 *mp = sbcreatecontrol((caddr_t)ip6e, 921 (ip6e->ip6e_len + 1) << 3, 922 IPV6_RTHDR, 923 IPPROTO_IPV6); 924 if (*mp) 925 mp = &(*mp)->m_next; 926 break; 927 928 case IPPROTO_UDP: 929 case IPPROTO_TCP: 930 case IPPROTO_ICMPV6: 931 default: 932 /* 933 * stop search if we encounter an upper 934 * layer protocol headers. 935 */ 936 goto loopend; 937 938 case IPPROTO_HOPOPTS: 939 case IPPROTO_AH: /* is it possible? */ 940 break; 941 } 942 943 /* proceed with the next header. */ 944 if (nxt == IPPROTO_AH) 945 off += (ip6e->ip6e_len + 2) << 2; 946 else 947 off += (ip6e->ip6e_len + 1) << 3; 948 nxt = ip6e->ip6e_nxt; 949 } 950 loopend: 951 } 952 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 953 /* to be done */ 954 } 955 if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { 956 /* to be done */ 957 } 958 /* IN6P_RTHDR - to be done */ 959 } 960 961 /* 962 * Get pointer to the previous header followed by the header 963 * currently processed. 964 * XXX: This function supposes that 965 * M includes all headers, 966 * the next header field and the header length field of each header 967 * are valid, and 968 * the sum of each header length equals to OFF. 969 * Because of these assumptions, this function must be called very 970 * carefully. Moreover, it will not be used in the near future when 971 * we develop `neater' mechanism to process extension headers. 972 */ 973 char * 974 ip6_get_prevhdr(m, off) 975 struct mbuf *m; 976 int off; 977 { 978 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 979 980 if (off == sizeof(struct ip6_hdr)) 981 return(&ip6->ip6_nxt); 982 else { 983 int len, nxt; 984 struct ip6_ext *ip6e = NULL; 985 986 nxt = ip6->ip6_nxt; 987 len = sizeof(struct ip6_hdr); 988 while (len < off) { 989 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 990 991 switch(nxt) { 992 case IPPROTO_FRAGMENT: 993 len += sizeof(struct ip6_frag); 994 break; 995 case IPPROTO_AH: 996 len += (ip6e->ip6e_len + 2) << 2; 997 break; 998 default: 999 len += (ip6e->ip6e_len + 1) << 3; 1000 break; 1001 } 1002 nxt = ip6e->ip6e_nxt; 1003 } 1004 if (ip6e) 1005 return(&ip6e->ip6e_nxt); 1006 else 1007 return NULL; 1008 } 1009 } 1010 1011 /* 1012 * System control for IP6 1013 */ 1014 1015 u_char inet6ctlerrmap[PRC_NCMDS] = { 1016 0, 0, 0, 0, 1017 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1018 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1019 EMSGSIZE, EHOSTUNREACH, 0, 0, 1020 0, 0, 0, 0, 1021 ENOPROTOOPT 1022 }; 1023