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/mbuf.h> 73 #include <sys/domain.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/errno.h> 78 #include <sys/time.h> 79 #include <sys/kernel.h> 80 #include <sys/syslog.h> 81 #include <sys/proc.h> 82 83 #include <net/if.h> 84 #include <net/if_types.h> 85 #include <net/if_dl.h> 86 #include <net/route.h> 87 #include <net/netisr.h> 88 #include <net/intrq.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/ip.h> 93 #include <netinet/ip_icmp.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet6/in6_var.h> 96 #include <netinet6/ip6.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet6/icmp6.h> 99 #include <netinet6/in6_ifattach.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/in6_prefix.h> 102 103 #ifdef IPV6FIREWALL 104 #include <netinet6/ip6_fw.h> 105 #endif 106 107 #ifdef ALTQ 108 #include <netinet/altq_cdnr.h> 109 #endif 110 111 #include <netinet6/ip6protosw.h> 112 113 /* we need it for NLOOP. */ 114 #include "loop.h" 115 116 #include "faith.h" 117 #include "gif.h" 118 119 #include <net/net_osdep.h> 120 121 extern struct domain inet6domain; 122 extern struct ip6protosw inet6sw[]; 123 124 u_char ip6_protox[IPPROTO_MAX]; 125 static int ip6qmaxlen = IFQ_MAXLEN; 126 struct in6_ifaddr *in6_ifaddr; 127 128 int ip6_forward_srcrt; /* XXX */ 129 int ip6_sourcecheck; /* XXX */ 130 int ip6_sourcecheck_interval; /* XXX */ 131 132 const int int6intrq_present = 1; 133 134 #ifdef IPV6FIREWALL 135 /* firewall hooks */ 136 ip6_fw_chk_t *ip6_fw_chk_ptr; 137 ip6_fw_ctl_t *ip6_fw_ctl_ptr; 138 #endif 139 140 struct ip6stat ip6stat; 141 142 static void ip6_init2 __P((void *)); 143 144 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 145 146 #if defined(PTR) 147 extern int ip6_protocol_tr; 148 149 int ptr_in6 __P((struct mbuf *, struct mbuf **)); 150 extern void ip_forward __P((struct mbuf *, int)); 151 #endif 152 153 /* 154 * IP6 initialization: fill in IP6 protocol switch table. 155 * All protocols not implemented in kernel go to raw IP6 protocol handler. 156 */ 157 void 158 ip6_init() 159 { 160 register struct ip6protosw *pr; 161 register int i; 162 struct timeval tv; 163 164 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 165 if (pr == 0) 166 panic("ip6_init"); 167 for (i = 0; i < IPPROTO_MAX; i++) 168 ip6_protox[i] = pr - inet6sw; 169 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 170 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 171 if (pr->pr_domain->dom_family == PF_INET6 && 172 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 173 ip6_protox[pr->pr_protocol] = pr - inet6sw; 174 ip6intrq.ifq_maxlen = ip6qmaxlen; 175 register_netisr(NETISR_IPV6, ip6intr); 176 nd6_init(); 177 frag6_init(); 178 #ifdef IPV6FIREWALL 179 ip6_fw_init(); 180 #endif 181 /* 182 * in many cases, random() here does NOT return random number 183 * as initialization during bootstrap time occur in fixed order. 184 */ 185 microtime(&tv); 186 ip6_flow_seq = random() ^ tv.tv_usec; 187 } 188 189 static void 190 ip6_init2(dummy) 191 void *dummy; 192 { 193 int i; 194 int ret; 195 196 /* get EUI64 from somewhere */ 197 ret = in6_ifattach_getifid(NULL); 198 199 /* 200 * to route local address of p2p link to loopback, 201 * assign loopback address first. 202 */ 203 for (i = 0; i < NLOOP; i++) 204 in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0); 205 206 /* attach pseudo interfaces */ 207 if (ret == 0) 208 in6_ifattach_p2p(); 209 210 /* nd6_timer_init */ 211 timeout(nd6_timer, (caddr_t)0, hz); 212 /* router renumbering prefix list maintenance */ 213 timeout(in6_rr_timer, (caddr_t)0, hz); 214 } 215 216 /* cheat */ 217 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 218 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 219 220 /* 221 * IP6 input interrupt handling. Just pass the packet to ip6_input. 222 */ 223 void 224 ip6intr() 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 } 238 239 extern struct route_in6 ip6_forward_rt; 240 241 void 242 ip6_input(m) 243 struct mbuf *m; 244 { 245 struct ip6_hdr *ip6; 246 int off = sizeof(struct ip6_hdr), nest; 247 u_int32_t plen; 248 u_int32_t rtalert = ~0; 249 int nxt, ours = 0; 250 struct ifnet *deliverifp = NULL; 251 252 #ifdef IPSEC 253 /* 254 * should the inner packet be considered authentic? 255 * see comment in ah4_input(). 256 */ 257 if (m) { 258 m->m_flags &= ~M_AUTHIPHDR; 259 m->m_flags &= ~M_AUTHIPDGM; 260 } 261 #endif 262 263 /* 264 * mbuf statistics by kazu 265 */ 266 if (m->m_flags & M_EXT) { 267 if (m->m_next) 268 ip6stat.ip6s_mext2m++; 269 else 270 ip6stat.ip6s_mext1++; 271 } else { 272 if (m->m_next) { 273 if (m->m_flags & M_LOOP) { 274 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 275 } else if (m->m_pkthdr.rcvif->if_index <= 31) 276 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 277 else 278 ip6stat.ip6s_m2m[0]++; 279 } else 280 ip6stat.ip6s_m1++; 281 } 282 283 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 284 ip6stat.ip6s_total++; 285 286 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 287 288 if (m->m_len < sizeof(struct ip6_hdr)) { 289 struct ifnet *inifp; 290 inifp = m->m_pkthdr.rcvif; 291 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 292 ip6stat.ip6s_toosmall++; 293 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 294 return; 295 } 296 } 297 298 ip6 = mtod(m, struct ip6_hdr *); 299 300 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 301 ip6stat.ip6s_badvers++; 302 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 303 goto bad; 304 } 305 306 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 307 308 #ifdef IPV6FIREWALL 309 /* 310 * Check with the firewall... 311 */ 312 if (ip6_fw_chk_ptr) { 313 u_short port = 0; 314 /* If ipfw says divert, we have to just drop packet */ 315 /* use port as a dummy argument */ 316 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { 317 m_freem(m); 318 m = NULL; 319 } 320 if (!m) 321 return; 322 } 323 #endif 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 * Scope check 334 */ 335 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 336 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 337 ip6stat.ip6s_badscope++; 338 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 339 goto bad; 340 } 341 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 342 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 343 if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { 344 ip6stat.ip6s_badscope++; 345 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 346 goto bad; 347 } 348 } 349 350 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 351 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 352 ours = 1; 353 deliverifp = m->m_pkthdr.rcvif; 354 goto hbhcheck; 355 } 356 } else { 357 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 358 ip6->ip6_src.s6_addr16[1] 359 = htons(m->m_pkthdr.rcvif->if_index); 360 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 361 ip6->ip6_dst.s6_addr16[1] 362 = htons(m->m_pkthdr.rcvif->if_index); 363 } 364 365 #if defined(PTR) 366 /* 367 * 368 */ 369 if (ip6_protocol_tr) 370 { 371 struct mbuf *m1 = NULL; 372 373 switch (ptr_in6(m, &m1)) 374 { 375 case IPPROTO_IP: goto mcastcheck; 376 case IPPROTO_IPV4: ip_forward(m1, 0); break; 377 case IPPROTO_IPV6: ip6_forward(m1, 0); break; 378 case IPPROTO_MAX: /* discard this packet */ 379 default: 380 } 381 382 if (m != m1) 383 m_freem(m); 384 385 return; 386 } 387 388 mcastcheck: 389 #endif 390 391 /* 392 * Multicast check 393 */ 394 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 395 struct in6_multi *in6m = 0; 396 397 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 398 /* 399 * See if we belong to the destination multicast group on the 400 * arrival interface. 401 */ 402 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 403 if (in6m) 404 ours = 1; 405 else if (!ip6_mrouter) { 406 ip6stat.ip6s_notmember++; 407 ip6stat.ip6s_cantforward++; 408 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 409 goto bad; 410 } 411 deliverifp = m->m_pkthdr.rcvif; 412 goto hbhcheck; 413 } 414 415 /* 416 * Unicast check 417 */ 418 if (ip6_forward_rt.ro_rt == 0 || 419 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 420 &ip6_forward_rt.ro_dst.sin6_addr)) { 421 if (ip6_forward_rt.ro_rt) { 422 RTFREE(ip6_forward_rt.ro_rt); 423 ip6_forward_rt.ro_rt = 0; 424 } 425 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 426 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 427 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 428 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 429 430 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); 431 } 432 433 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 434 435 /* 436 * Accept the packet if the forwarding interface to the destination 437 * according to the routing table is the loopback interface, 438 * unless the associated route has a gateway. 439 * Note that this approach causes to accept a packet if there is a 440 * route to the loopback interface for the destination of the packet. 441 * But we think it's even useful in some situations, e.g. when using 442 * a special daemon which wants to intercept the packet. 443 */ 444 if (ip6_forward_rt.ro_rt && 445 (ip6_forward_rt.ro_rt->rt_flags & 446 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 447 /* 448 * The comparison of the destination and the key of the rtentry 449 * has already done through looking up the routing table, 450 * so no need to do such a comparison here again. 451 */ 452 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 453 struct in6_ifaddr *ia6 = 454 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 455 /* packet to tentative address must not be received */ 456 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 457 m->m_flags |= M_ANYCAST6; 458 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 459 /* this interface is ready */ 460 ours = 1; 461 deliverifp = ia6->ia_ifp; /* correct? */ 462 goto hbhcheck; 463 } else { 464 /* this interface is not ready, fall through */ 465 } 466 } 467 468 /* 469 * FAITH(Firewall Aided Internet Translator) 470 */ 471 #if defined(NFAITH) && 0 < NFAITH 472 if (ip6_keepfaith) { 473 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 474 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 475 /* XXX do we need more sanity checks? */ 476 ours = 1; 477 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ 478 goto hbhcheck; 479 } 480 } 481 #endif 482 483 /* 484 * Now there is no reason to process the packet if it's not our own 485 * and we're not a router. 486 */ 487 if (!ip6_forwarding) { 488 ip6stat.ip6s_cantforward++; 489 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 490 goto bad; 491 } 492 493 hbhcheck: 494 /* 495 * Process Hop-by-Hop options header if it's contained. 496 * m may be modified in ip6_hopopts_input(). 497 * If a JumboPayload option is included, plen will also be modified. 498 */ 499 plen = (u_int32_t)ntohs(ip6->ip6_plen); 500 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 501 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 502 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 503 return; /* m have already been freed */ 504 } 505 /* adjust pointer */ 506 ip6 = mtod(m, struct ip6_hdr *); 507 nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; 508 509 /* 510 * accept the packet if a router alert option is included 511 * and we act as an IPv6 router. 512 */ 513 if (rtalert != ~0 && ip6_forwarding) 514 ours = 1; 515 } else 516 nxt = ip6->ip6_nxt; 517 518 /* 519 * Check that the amount of data in the buffers 520 * is as at least much as the IPv6 header would have us expect. 521 * Trim mbufs if longer than we expect. 522 * Drop packet if shorter than we expect. 523 */ 524 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 525 ip6stat.ip6s_tooshort++; 526 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 527 goto bad; 528 } 529 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 530 if (m->m_len == m->m_pkthdr.len) { 531 m->m_len = sizeof(struct ip6_hdr) + plen; 532 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 533 } else 534 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 535 } 536 537 /* 538 * Forward if desirable. 539 */ 540 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 541 /* 542 * If we are acting as a multicast router, all 543 * incoming multicast packets are passed to the 544 * kernel-level multicast forwarding function. 545 * The packet is returned (relatively) intact; if 546 * ip6_mforward() returns a non-zero value, the packet 547 * must be discarded, else it may be accepted below. 548 */ 549 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 550 ip6stat.ip6s_cantforward++; 551 m_freem(m); 552 return; 553 } 554 if (!ours) { 555 m_freem(m); 556 return; 557 } 558 } else if (!ours) { 559 ip6_forward(m, 0); 560 return; 561 } 562 563 /* 564 * Tell launch routine the next header 565 */ 566 #if defined(__NetBSD__) && defined(IFA_STATS) 567 if (IFA_STATS && deliverifp != NULL) { 568 struct in6_ifaddr *ia6; 569 ip6 = mtod(m, struct ip6_hdr *); 570 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 571 if (ia6) 572 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 573 } 574 #endif 575 ip6stat.ip6s_delivered++; 576 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 577 nest = 0; 578 while (nxt != IPPROTO_DONE) { 579 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 580 ip6stat.ip6s_toomanyhdr++; 581 goto bad; 582 } 583 584 /* 585 * protection against faulty packet - there should be 586 * more sanity checks in header chain processing. 587 */ 588 if (m->m_pkthdr.len < off) { 589 ip6stat.ip6s_tooshort++; 590 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 591 goto bad; 592 } 593 594 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 595 } 596 return; 597 bad: 598 m_freem(m); 599 } 600 601 /* 602 * Hop-by-Hop options header processing. If a valid jumbo payload option is 603 * included, the real payload length will be stored in plenp. 604 */ 605 static int 606 ip6_hopopts_input(plenp, rtalertp, mp, offp) 607 u_int32_t *plenp; 608 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 609 struct mbuf **mp; 610 int *offp; 611 { 612 register struct mbuf *m = *mp; 613 int off = *offp, hbhlen; 614 struct ip6_hbh *hbh; 615 u_int8_t *opt; 616 617 /* validation of the length of the header */ 618 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 619 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 620 hbhlen = (hbh->ip6h_len + 1) << 3; 621 622 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 623 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 624 off += hbhlen; 625 hbhlen -= sizeof(struct ip6_hbh); 626 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 627 628 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 629 hbhlen, rtalertp, plenp) < 0) 630 return(-1); 631 632 *offp = off; 633 *mp = m; 634 return(0); 635 } 636 637 /* 638 * Search header for all Hop-by-hop options and process each option. 639 * This function is separate from ip6_hopopts_input() in order to 640 * handle a case where the sending node itself process its hop-by-hop 641 * options header. In such a case, the function is called from ip6_output(). 642 */ 643 int 644 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 645 struct mbuf *m; 646 u_int8_t *opthead; 647 int hbhlen; 648 u_int32_t *rtalertp; 649 u_int32_t *plenp; 650 { 651 struct ip6_hdr *ip6; 652 int optlen = 0; 653 u_int8_t *opt = opthead; 654 u_int16_t rtalert_val; 655 656 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 657 switch(*opt) { 658 case IP6OPT_PAD1: 659 optlen = 1; 660 break; 661 case IP6OPT_PADN: 662 if (hbhlen < IP6OPT_MINLEN) { 663 ip6stat.ip6s_toosmall++; 664 goto bad; 665 } 666 optlen = *(opt + 1) + 2; 667 break; 668 case IP6OPT_RTALERT: 669 /* XXX may need check for alignment */ 670 if (hbhlen < IP6OPT_RTALERT_LEN) { 671 ip6stat.ip6s_toosmall++; 672 goto bad; 673 } 674 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 675 /* XXX: should we discard the packet? */ 676 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 677 *(opt + 1)); 678 optlen = IP6OPT_RTALERT_LEN; 679 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 680 *rtalertp = ntohs(rtalert_val); 681 break; 682 case IP6OPT_JUMBO: 683 /* XXX may need check for alignment */ 684 if (hbhlen < IP6OPT_JUMBO_LEN) { 685 ip6stat.ip6s_toosmall++; 686 goto bad; 687 } 688 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 689 /* XXX: should we discard the packet? */ 690 log(LOG_ERR, "length of jumbopayload opt " 691 "is inconsistent(%d)", 692 *(opt + 1)); 693 optlen = IP6OPT_JUMBO_LEN; 694 695 bcopy(opt + 2, plenp, sizeof(*plenp)); 696 *plenp = htonl(*plenp); 697 if (*plenp <= IPV6_MAXPACKET) { 698 /* 699 * jumbo payload length must be larger 700 * than 65535 701 */ 702 ip6stat.ip6s_badoptions++; 703 icmp6_error(m, ICMP6_PARAM_PROB, 704 ICMP6_PARAMPROB_HEADER, 705 sizeof(struct ip6_hdr) + 706 sizeof(struct ip6_hbh) + 707 opt + 2 - opthead); 708 return(-1); 709 } 710 711 ip6 = mtod(m, struct ip6_hdr *); 712 if (ip6->ip6_plen) { 713 /* 714 * IPv6 packets that have non 0 payload length 715 * must not contain a jumbo paylod option. 716 */ 717 ip6stat.ip6s_badoptions++; 718 icmp6_error(m, ICMP6_PARAM_PROB, 719 ICMP6_PARAMPROB_HEADER, 720 sizeof(struct ip6_hdr) + 721 sizeof(struct ip6_hbh) + 722 opt - opthead); 723 return(-1); 724 } 725 break; 726 default: /* unknown option */ 727 if (hbhlen < IP6OPT_MINLEN) { 728 ip6stat.ip6s_toosmall++; 729 goto bad; 730 } 731 if ((optlen = ip6_unknown_opt(opt, m, 732 sizeof(struct ip6_hdr) + 733 sizeof(struct ip6_hbh) + 734 opt - opthead)) == -1) 735 return(-1); 736 optlen += 2; 737 break; 738 } 739 } 740 741 return(0); 742 743 bad: 744 m_freem(m); 745 return(-1); 746 } 747 748 /* 749 * Unknown option processing. 750 * The third argument `off' is the offset from the IPv6 header to the option, 751 * which is necessary if the IPv6 header the and option header and IPv6 header 752 * is not continuous in order to return an ICMPv6 error. 753 */ 754 int 755 ip6_unknown_opt(optp, m, off) 756 u_int8_t *optp; 757 struct mbuf *m; 758 int off; 759 { 760 struct ip6_hdr *ip6; 761 762 switch(IP6OPT_TYPE(*optp)) { 763 case IP6OPT_TYPE_SKIP: /* ignore the option */ 764 return((int)*(optp + 1)); 765 case IP6OPT_TYPE_DISCARD: /* silently discard */ 766 m_freem(m); 767 return(-1); 768 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 769 ip6stat.ip6s_badoptions++; 770 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 771 return(-1); 772 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 773 ip6stat.ip6s_badoptions++; 774 ip6 = mtod(m, struct ip6_hdr *); 775 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 776 (m->m_flags & (M_BCAST|M_MCAST))) 777 m_freem(m); 778 else 779 icmp6_error(m, ICMP6_PARAM_PROB, 780 ICMP6_PARAMPROB_OPTION, off); 781 return(-1); 782 } 783 784 m_freem(m); /* XXX: NOTREACHED */ 785 return(-1); 786 } 787 788 /* 789 * Create the "control" list for this pcb 790 */ 791 void 792 ip6_savecontrol(in6p, mp, ip6, m) 793 register struct inpcb *in6p; 794 register struct mbuf **mp; 795 register struct ip6_hdr *ip6; 796 register struct mbuf *m; 797 { 798 struct proc *p = curproc; /* XXX */ 799 int privileged; 800 801 privileged = 0; 802 if (p && !suser(p)) 803 privileged++; 804 805 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 806 struct timeval tv; 807 808 microtime(&tv); 809 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 810 SCM_TIMESTAMP, SOL_SOCKET); 811 if (*mp) 812 mp = &(*mp)->m_next; 813 } 814 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 815 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 816 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 817 IPPROTO_IPV6); 818 if (*mp) 819 mp = &(*mp)->m_next; 820 } 821 822 /* RFC 2292 sec. 5 */ 823 if (in6p->in6p_flags & IN6P_PKTINFO) { 824 struct in6_pktinfo pi6; 825 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 826 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 827 pi6.ipi6_addr.s6_addr16[1] = 0; 828 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 829 ? m->m_pkthdr.rcvif->if_index 830 : 0; 831 *mp = sbcreatecontrol((caddr_t) &pi6, 832 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 833 IPPROTO_IPV6); 834 if (*mp) 835 mp = &(*mp)->m_next; 836 } 837 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 838 int hlim = ip6->ip6_hlim & 0xff; 839 *mp = sbcreatecontrol((caddr_t) &hlim, 840 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 841 if (*mp) 842 mp = &(*mp)->m_next; 843 } 844 /* IN6P_NEXTHOP - for outgoing packet only */ 845 846 /* 847 * IPV6_HOPOPTS socket option. We require super-user privilege 848 * for the option, but it might be too strict, since there might 849 * be some hop-by-hop options which can be returned to normal user. 850 * See RFC 2292 section 6. 851 */ 852 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 853 /* 854 * Check if a hop-by-hop options header is contatined in the 855 * received packet, and if so, store the options as ancillary 856 * data. Note that a hop-by-hop options header must be 857 * just after the IPv6 header, which fact is assured through 858 * the IPv6 input processing. 859 */ 860 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 861 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 862 struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); 863 864 /* 865 * XXX: We copy whole the header even if a jumbo 866 * payload option is included, which option is to 867 * be removed before returning in the RFC 2292. 868 * But it's too painful operation... 869 */ 870 *mp = sbcreatecontrol((caddr_t)hbh, 871 (hbh->ip6h_len + 1) << 3, 872 IPV6_HOPOPTS, IPPROTO_IPV6); 873 if (*mp) 874 mp = &(*mp)->m_next; 875 } 876 } 877 878 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 879 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 880 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 881 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 882 883 /* 884 * Search for destination options headers or routing 885 * header(s) through the header chain, and stores each 886 * header as ancillary data. 887 * Note that the order of the headers remains in 888 * the chain of ancillary data. 889 */ 890 while(1) { /* is explicit loop prevention necessary? */ 891 struct ip6_ext *ip6e = 892 (struct ip6_ext *)(mtod(m, caddr_t) + off); 893 894 switch(nxt) { 895 case IPPROTO_DSTOPTS: 896 if (!in6p->in6p_flags & IN6P_DSTOPTS) 897 break; 898 899 /* 900 * We also require super-user privilege for 901 * the option. 902 * See the comments on IN6_HOPOPTS. 903 */ 904 if (!privileged) 905 break; 906 907 *mp = sbcreatecontrol((caddr_t)ip6e, 908 (ip6e->ip6e_len + 1) << 3, 909 IPV6_DSTOPTS, 910 IPPROTO_IPV6); 911 if (*mp) 912 mp = &(*mp)->m_next; 913 break; 914 915 case IPPROTO_ROUTING: 916 if (!in6p->in6p_flags & IN6P_RTHDR) 917 break; 918 919 *mp = sbcreatecontrol((caddr_t)ip6e, 920 (ip6e->ip6e_len + 1) << 3, 921 IPV6_RTHDR, 922 IPPROTO_IPV6); 923 if (*mp) 924 mp = &(*mp)->m_next; 925 break; 926 927 case IPPROTO_UDP: 928 case IPPROTO_TCP: 929 case IPPROTO_ICMPV6: 930 default: 931 /* 932 * stop search if we encounter an upper 933 * layer protocol headers. 934 */ 935 goto loopend; 936 937 case IPPROTO_HOPOPTS: 938 case IPPROTO_AH: /* is it possible? */ 939 break; 940 } 941 942 /* proceed with the next header. */ 943 if (nxt == IPPROTO_AH) 944 off += (ip6e->ip6e_len + 2) << 2; 945 else 946 off += (ip6e->ip6e_len + 1) << 3; 947 nxt = ip6e->ip6e_nxt; 948 } 949 loopend: 950 } 951 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 952 /* to be done */ 953 } 954 if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { 955 /* to be done */ 956 } 957 /* IN6P_RTHDR - to be done */ 958 } 959 960 /* 961 * Get pointer to the previous header followed by the header 962 * currently processed. 963 * XXX: This function supposes that 964 * M includes all headers, 965 * the next header field and the header length field of each header 966 * are valid, and 967 * the sum of each header length equals to OFF. 968 * Because of these assumptions, this function must be called very 969 * carefully. Moreover, it will not be used in the near future when 970 * we develop `neater' mechanism to process extension headers. 971 */ 972 char * 973 ip6_get_prevhdr(m, off) 974 struct mbuf *m; 975 int off; 976 { 977 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 978 979 if (off == sizeof(struct ip6_hdr)) 980 return(&ip6->ip6_nxt); 981 else { 982 int len, nxt; 983 struct ip6_ext *ip6e = NULL; 984 985 nxt = ip6->ip6_nxt; 986 len = sizeof(struct ip6_hdr); 987 while (len < off) { 988 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 989 990 switch(nxt) { 991 case IPPROTO_FRAGMENT: 992 len += sizeof(struct ip6_frag); 993 break; 994 case IPPROTO_AH: 995 len += (ip6e->ip6e_len + 2) << 2; 996 break; 997 default: 998 len += (ip6e->ip6e_len + 1) << 3; 999 break; 1000 } 1001 nxt = ip6e->ip6e_nxt; 1002 } 1003 if (ip6e) 1004 return(&ip6e->ip6e_nxt); 1005 else 1006 return NULL; 1007 } 1008 } 1009 1010 /* 1011 * System control for IP6 1012 */ 1013 1014 u_char inet6ctlerrmap[PRC_NCMDS] = { 1015 0, 0, 0, 0, 1016 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1017 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1018 EMSGSIZE, EHOSTUNREACH, 0, 0, 1019 0, 0, 0, 0, 1020 ENOPROTOOPT 1021 }; 1022