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 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/malloc.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 89 #include <netinet/in.h> 90 #include <netinet/in_systm.h> 91 #include <netinet/ip.h> 92 #include <netinet/ip_icmp.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet6/in6_var.h> 95 #include <netinet6/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/icmp6.h> 98 #include <netinet6/in6_ifattach.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/in6_prefix.h> 101 102 #ifdef IPV6FIREWALL 103 #include <netinet6/ip6_fw.h> 104 #endif 105 106 #ifdef ALTQ 107 #include <netinet/altq_cdnr.h> 108 #endif 109 110 #include <netinet6/ip6protosw.h> 111 112 /* we need it for NLOOP. */ 113 #include "loop.h" 114 115 #include "faith.h" 116 #include "gif.h" 117 118 #include <net/net_osdep.h> 119 120 extern struct domain inet6domain; 121 extern struct ip6protosw inet6sw[]; 122 123 u_char ip6_protox[IPPROTO_MAX]; 124 static int ip6qmaxlen = IFQ_MAXLEN; 125 struct in6_ifaddr *in6_ifaddr; 126 struct ifqueue ip6intrq; 127 128 int ip6_forward_srcrt; /* XXX */ 129 int ip6_sourcecheck; /* XXX */ 130 int ip6_sourcecheck_interval; /* XXX */ 131 132 #ifdef IPV6FIREWALL 133 /* firewall hooks */ 134 ip6_fw_chk_t *ip6_fw_chk_ptr; 135 ip6_fw_ctl_t *ip6_fw_ctl_ptr; 136 #endif 137 138 struct ip6stat ip6stat; 139 140 static void ip6_init2 __P((void *)); 141 142 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 143 144 #if defined(PTR) 145 extern int ip6_protocol_tr; 146 147 int ptr_in6 __P((struct mbuf *, struct mbuf **)); 148 extern void ip_forward __P((struct mbuf *, int)); 149 #endif 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 #ifdef IPV6FIREWALL 176 ip6_fw_init(); 177 #endif 178 /* 179 * in many cases, random() here does NOT return random number 180 * as initialization during bootstrap time occur in fixed order. 181 */ 182 microtime(&tv); 183 ip6_flow_seq = random() ^ tv.tv_usec; 184 } 185 186 static void 187 ip6_init2(dummy) 188 void *dummy; 189 { 190 int i; 191 int ret; 192 193 /* get EUI64 from somewhere */ 194 ret = in6_ifattach_getifid(NULL); 195 196 /* 197 * to route local address of p2p link to loopback, 198 * assign loopback address first. 199 */ 200 for (i = 0; i < NLOOP; i++) 201 in6_ifattach(&loif[i], IN6_IFT_LOOP, NULL, 0); 202 203 /* attach pseudo interfaces */ 204 if (ret == 0) 205 in6_ifattach_p2p(); 206 207 /* nd6_timer_init */ 208 timeout(nd6_timer, (caddr_t)0, hz); 209 /* router renumbering prefix list maintenance */ 210 timeout(in6_rr_timer, (caddr_t)0, hz); 211 } 212 213 /* cheat */ 214 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 215 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 216 217 /* 218 * IP6 input interrupt handling. Just pass the packet to ip6_input. 219 */ 220 void 221 ip6intr() 222 { 223 int s; 224 struct mbuf *m; 225 226 for (;;) { 227 s = splimp(); 228 IF_DEQUEUE(&ip6intrq, m); 229 splx(s); 230 if (m == 0) 231 return; 232 ip6_input(m); 233 } 234 } 235 236 NETISR_SET(NETISR_IPV6, ip6intr); 237 238 extern struct route_in6 ip6_forward_rt; 239 240 void 241 ip6_input(m) 242 struct mbuf *m; 243 { 244 struct ip6_hdr *ip6; 245 int off = sizeof(struct ip6_hdr), nest; 246 u_int32_t plen; 247 u_int32_t rtalert = ~0; 248 int nxt, ours = 0; 249 struct ifnet *deliverifp = NULL; 250 251 #ifdef IPSEC 252 /* 253 * should the inner packet be considered authentic? 254 * see comment in ah4_input(). 255 */ 256 if (m) { 257 m->m_flags &= ~M_AUTHIPHDR; 258 m->m_flags &= ~M_AUTHIPDGM; 259 } 260 #endif 261 262 /* 263 * mbuf statistics by kazu 264 */ 265 if (m->m_flags & M_EXT) { 266 if (m->m_next) 267 ip6stat.ip6s_mext2m++; 268 else 269 ip6stat.ip6s_mext1++; 270 } else { 271 if (m->m_next) { 272 if (m->m_flags & M_LOOP) { 273 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 274 } else if (m->m_pkthdr.rcvif->if_index <= 31) 275 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 276 else 277 ip6stat.ip6s_m2m[0]++; 278 } else 279 ip6stat.ip6s_m1++; 280 } 281 282 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 283 ip6stat.ip6s_total++; 284 285 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 286 287 if (m->m_len < sizeof(struct ip6_hdr)) { 288 struct ifnet *inifp; 289 inifp = m->m_pkthdr.rcvif; 290 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 291 ip6stat.ip6s_toosmall++; 292 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 293 return; 294 } 295 } 296 297 ip6 = mtod(m, struct ip6_hdr *); 298 299 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 300 ip6stat.ip6s_badvers++; 301 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 302 goto bad; 303 } 304 305 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 306 307 #ifdef IPV6FIREWALL 308 /* 309 * Check with the firewall... 310 */ 311 if (ip6_fw_chk_ptr) { 312 u_short port = 0; 313 /* If ipfw says divert, we have to just drop packet */ 314 /* use port as a dummy argument */ 315 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { 316 m_freem(m); 317 m = NULL; 318 } 319 if (!m) 320 return; 321 } 322 #endif 323 324 #ifdef ALTQ 325 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 326 /* packet is dropped by traffic conditioner */ 327 return; 328 } 329 #endif 330 331 /* 332 * Scope check 333 */ 334 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 335 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 336 ip6stat.ip6s_badscope++; 337 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 338 goto bad; 339 } 340 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 341 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 342 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 343 ours = 1; 344 deliverifp = m->m_pkthdr.rcvif; 345 goto hbhcheck; 346 } else { 347 ip6stat.ip6s_badscope++; 348 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 349 goto bad; 350 } 351 } 352 353 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 354 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 355 ours = 1; 356 deliverifp = m->m_pkthdr.rcvif; 357 goto hbhcheck; 358 } 359 } else { 360 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 361 ip6->ip6_src.s6_addr16[1] 362 = htons(m->m_pkthdr.rcvif->if_index); 363 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 364 ip6->ip6_dst.s6_addr16[1] 365 = htons(m->m_pkthdr.rcvif->if_index); 366 } 367 368 #if defined(PTR) 369 /* 370 * 371 */ 372 if (ip6_protocol_tr) 373 { 374 struct mbuf *m1 = NULL; 375 376 switch (ptr_in6(m, &m1)) 377 { 378 case IPPROTO_IP: goto mcastcheck; 379 case IPPROTO_IPV4: ip_forward(m1, 0); break; 380 case IPPROTO_IPV6: ip6_forward(m1, 0); break; 381 case IPPROTO_MAX: /* discard this packet */ 382 default: 383 } 384 385 if (m != m1) 386 m_freem(m); 387 388 return; 389 } 390 391 mcastcheck: 392 #endif 393 394 /* 395 * Multicast check 396 */ 397 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 398 struct in6_multi *in6m = 0; 399 400 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 401 /* 402 * See if we belong to the destination multicast group on the 403 * arrival interface. 404 */ 405 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 406 if (in6m) 407 ours = 1; 408 else { 409 ip6stat.ip6s_notmember++; 410 ip6stat.ip6s_cantforward++; 411 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 412 goto bad; 413 } 414 deliverifp = m->m_pkthdr.rcvif; 415 goto hbhcheck; 416 } 417 418 /* 419 * Unicast check 420 */ 421 if (ip6_forward_rt.ro_rt == 0 || 422 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 423 &ip6_forward_rt.ro_dst.sin6_addr)) { 424 if (ip6_forward_rt.ro_rt) { 425 RTFREE(ip6_forward_rt.ro_rt); 426 ip6_forward_rt.ro_rt = 0; 427 } 428 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 429 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 430 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 431 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 432 433 rtalloc_ign((struct route *)&ip6_forward_rt, RTF_PRCLONING); 434 } 435 436 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 437 438 /* 439 * Accept the packet if the forwarding interface to the destination 440 * according to the routing table is the loopback interface, 441 * unless the associated route has a gateway. 442 * Note that this approach causes to accept a packet if there is a 443 * route to the loopback interface for the destination of the packet. 444 * But we think it's even useful in some situations, e.g. when using 445 * a special daemon which wants to intercept the packet. 446 */ 447 if (ip6_forward_rt.ro_rt && 448 (ip6_forward_rt.ro_rt->rt_flags & 449 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 450 /* 451 * The comparison of the destination and the key of the rtentry 452 * has already done through looking up the routing table, 453 * so no need to do such a comparison here again. 454 */ 455 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 456 struct in6_ifaddr *ia6 = 457 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 458 /* packet to tentative address must not be received */ 459 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 460 m->m_flags |= M_ANYCAST6; 461 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 462 /* this interface is ready */ 463 ours = 1; 464 deliverifp = ia6->ia_ifp; /* correct? */ 465 goto hbhcheck; 466 } else { 467 /* this interface is not ready, fall through */ 468 } 469 } 470 471 /* 472 * FAITH(Firewall Aided Internet Translator) 473 */ 474 #if defined(NFAITH) && 0 < NFAITH 475 if (ip6_keepfaith) { 476 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 477 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 478 /* XXX do we need more sanity checks? */ 479 ours = 1; 480 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ 481 goto hbhcheck; 482 } 483 } 484 #endif 485 486 /* 487 * Now there is no reason to process the packet if it's not our own 488 * and we're not a router. 489 */ 490 if (!ip6_forwarding) { 491 ip6stat.ip6s_cantforward++; 492 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 493 goto bad; 494 } 495 496 hbhcheck: 497 /* 498 * Process Hop-by-Hop options header if it's contained. 499 * m may be modified in ip6_hopopts_input(). 500 * If a JumboPayload option is included, plen will also be modified. 501 */ 502 plen = (u_int32_t)ntohs(ip6->ip6_plen); 503 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 504 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 505 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 506 return; /* m have already been freed */ 507 } 508 /* adjust pointer */ 509 ip6 = mtod(m, struct ip6_hdr *); 510 nxt = ((struct ip6_hbh *)(ip6 + 1))->ip6h_nxt; 511 512 /* 513 * accept the packet if a router alert option is included 514 * and we act as an IPv6 router. 515 */ 516 if (rtalert != ~0 && ip6_forwarding) 517 ours = 1; 518 } else 519 nxt = ip6->ip6_nxt; 520 521 /* 522 * Check that the amount of data in the buffers 523 * is as at least much as the IPv6 header would have us expect. 524 * Trim mbufs if longer than we expect. 525 * Drop packet if shorter than we expect. 526 */ 527 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 528 ip6stat.ip6s_tooshort++; 529 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 530 goto bad; 531 } 532 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 533 if (m->m_len == m->m_pkthdr.len) { 534 m->m_len = sizeof(struct ip6_hdr) + plen; 535 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 536 } else 537 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 538 } 539 540 /* 541 * Forward if desirable. 542 */ 543 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 544 if (!ours) { 545 m_freem(m); 546 return; 547 } 548 } else if (!ours) { 549 ip6_forward(m, 0); 550 return; 551 } 552 553 /* 554 * Tell launch routine the next header 555 */ 556 #if defined(__NetBSD__) && defined(IFA_STATS) 557 if (IFA_STATS && deliverifp != NULL) { 558 struct in6_ifaddr *ia6; 559 ip6 = mtod(m, struct ip6_hdr *); 560 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 561 if (ia6) 562 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 563 } 564 #endif 565 ip6stat.ip6s_delivered++; 566 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 567 nest = 0; 568 while (nxt != IPPROTO_DONE) { 569 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 570 ip6stat.ip6s_toomanyhdr++; 571 goto bad; 572 } 573 574 /* 575 * protection against faulty packet - there should be 576 * more sanity checks in header chain processing. 577 */ 578 if (m->m_pkthdr.len < off) { 579 ip6stat.ip6s_tooshort++; 580 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 581 goto bad; 582 } 583 584 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 585 } 586 return; 587 bad: 588 m_freem(m); 589 } 590 591 /* 592 * Hop-by-Hop options header processing. If a valid jumbo payload option is 593 * included, the real payload length will be stored in plenp. 594 */ 595 static int 596 ip6_hopopts_input(plenp, rtalertp, mp, offp) 597 u_int32_t *plenp; 598 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 599 struct mbuf **mp; 600 int *offp; 601 { 602 register struct mbuf *m = *mp; 603 int off = *offp, hbhlen; 604 struct ip6_hbh *hbh; 605 u_int8_t *opt; 606 607 /* validation of the length of the header */ 608 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 609 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 610 hbhlen = (hbh->ip6h_len + 1) << 3; 611 612 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 613 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 614 off += hbhlen; 615 hbhlen -= sizeof(struct ip6_hbh); 616 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 617 618 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 619 hbhlen, rtalertp, plenp) < 0) 620 return(-1); 621 622 *offp = off; 623 *mp = m; 624 return(0); 625 } 626 627 /* 628 * Search header for all Hop-by-hop options and process each option. 629 * This function is separate from ip6_hopopts_input() in order to 630 * handle a case where the sending node itself process its hop-by-hop 631 * options header. In such a case, the function is called from ip6_output(). 632 */ 633 int 634 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 635 struct mbuf *m; 636 u_int8_t *opthead; 637 int hbhlen; 638 u_int32_t *rtalertp; 639 u_int32_t *plenp; 640 { 641 struct ip6_hdr *ip6; 642 int optlen = 0; 643 u_int8_t *opt = opthead; 644 u_int16_t rtalert_val; 645 646 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 647 switch(*opt) { 648 case IP6OPT_PAD1: 649 optlen = 1; 650 break; 651 case IP6OPT_PADN: 652 if (hbhlen < IP6OPT_MINLEN) { 653 ip6stat.ip6s_toosmall++; 654 goto bad; 655 } 656 optlen = *(opt + 1) + 2; 657 break; 658 case IP6OPT_RTALERT: 659 /* XXX may need check for alignment */ 660 if (hbhlen < IP6OPT_RTALERT_LEN) { 661 ip6stat.ip6s_toosmall++; 662 goto bad; 663 } 664 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 665 /* XXX: should we discard the packet? */ 666 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 667 *(opt + 1)); 668 optlen = IP6OPT_RTALERT_LEN; 669 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 670 *rtalertp = ntohs(rtalert_val); 671 break; 672 case IP6OPT_JUMBO: 673 /* XXX may need check for alignment */ 674 if (hbhlen < IP6OPT_JUMBO_LEN) { 675 ip6stat.ip6s_toosmall++; 676 goto bad; 677 } 678 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 679 /* XXX: should we discard the packet? */ 680 log(LOG_ERR, "length of jumbopayload opt " 681 "is inconsistent(%d)", 682 *(opt + 1)); 683 optlen = IP6OPT_JUMBO_LEN; 684 685 bcopy(opt + 2, plenp, sizeof(*plenp)); 686 *plenp = htonl(*plenp); 687 if (*plenp <= IPV6_MAXPACKET) { 688 /* 689 * jumbo payload length must be larger 690 * than 65535 691 */ 692 ip6stat.ip6s_badoptions++; 693 icmp6_error(m, ICMP6_PARAM_PROB, 694 ICMP6_PARAMPROB_HEADER, 695 sizeof(struct ip6_hdr) + 696 sizeof(struct ip6_hbh) + 697 opt + 2 - opthead); 698 return(-1); 699 } 700 701 ip6 = mtod(m, struct ip6_hdr *); 702 if (ip6->ip6_plen) { 703 /* 704 * IPv6 packets that have non 0 payload length 705 * must not contain a jumbo paylod option. 706 */ 707 ip6stat.ip6s_badoptions++; 708 icmp6_error(m, ICMP6_PARAM_PROB, 709 ICMP6_PARAMPROB_HEADER, 710 sizeof(struct ip6_hdr) + 711 sizeof(struct ip6_hbh) + 712 opt - opthead); 713 return(-1); 714 } 715 break; 716 default: /* unknown option */ 717 if (hbhlen < IP6OPT_MINLEN) { 718 ip6stat.ip6s_toosmall++; 719 goto bad; 720 } 721 if ((optlen = ip6_unknown_opt(opt, m, 722 sizeof(struct ip6_hdr) + 723 sizeof(struct ip6_hbh) + 724 opt - opthead)) == -1) 725 return(-1); 726 optlen += 2; 727 break; 728 } 729 } 730 731 return(0); 732 733 bad: 734 m_freem(m); 735 return(-1); 736 } 737 738 /* 739 * Unknown option processing. 740 * The third argument `off' is the offset from the IPv6 header to the option, 741 * which is necessary if the IPv6 header the and option header and IPv6 header 742 * is not continuous in order to return an ICMPv6 error. 743 */ 744 int 745 ip6_unknown_opt(optp, m, off) 746 u_int8_t *optp; 747 struct mbuf *m; 748 int off; 749 { 750 struct ip6_hdr *ip6; 751 752 switch(IP6OPT_TYPE(*optp)) { 753 case IP6OPT_TYPE_SKIP: /* ignore the option */ 754 return((int)*(optp + 1)); 755 case IP6OPT_TYPE_DISCARD: /* silently discard */ 756 m_freem(m); 757 return(-1); 758 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 759 ip6stat.ip6s_badoptions++; 760 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 761 return(-1); 762 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 763 ip6stat.ip6s_badoptions++; 764 ip6 = mtod(m, struct ip6_hdr *); 765 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 766 (m->m_flags & (M_BCAST|M_MCAST))) 767 m_freem(m); 768 else 769 icmp6_error(m, ICMP6_PARAM_PROB, 770 ICMP6_PARAMPROB_OPTION, off); 771 return(-1); 772 } 773 774 m_freem(m); /* XXX: NOTREACHED */ 775 return(-1); 776 } 777 778 /* 779 * Create the "control" list for this pcb 780 */ 781 void 782 ip6_savecontrol(in6p, mp, ip6, m) 783 register struct inpcb *in6p; 784 register struct mbuf **mp; 785 register struct ip6_hdr *ip6; 786 register struct mbuf *m; 787 { 788 struct proc *p = curproc; /* XXX */ 789 int privileged; 790 791 privileged = 0; 792 if (p && !suser(p)) 793 privileged++; 794 795 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 796 struct timeval tv; 797 798 microtime(&tv); 799 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 800 SCM_TIMESTAMP, SOL_SOCKET); 801 if (*mp) 802 mp = &(*mp)->m_next; 803 } 804 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 805 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 806 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 807 IPPROTO_IPV6); 808 if (*mp) 809 mp = &(*mp)->m_next; 810 } 811 812 /* RFC 2292 sec. 5 */ 813 if (in6p->in6p_flags & IN6P_PKTINFO) { 814 struct in6_pktinfo pi6; 815 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 816 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 817 pi6.ipi6_addr.s6_addr16[1] = 0; 818 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 819 ? m->m_pkthdr.rcvif->if_index 820 : 0; 821 *mp = sbcreatecontrol((caddr_t) &pi6, 822 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 823 IPPROTO_IPV6); 824 if (*mp) 825 mp = &(*mp)->m_next; 826 } 827 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 828 int hlim = ip6->ip6_hlim & 0xff; 829 *mp = sbcreatecontrol((caddr_t) &hlim, 830 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 831 if (*mp) 832 mp = &(*mp)->m_next; 833 } 834 /* IN6P_NEXTHOP - for outgoing packet only */ 835 836 /* 837 * IPV6_HOPOPTS socket option. We require super-user privilege 838 * for the option, but it might be too strict, since there might 839 * be some hop-by-hop options which can be returned to normal user. 840 * See RFC 2292 section 6. 841 */ 842 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 843 /* 844 * Check if a hop-by-hop options header is contatined in the 845 * received packet, and if so, store the options as ancillary 846 * data. Note that a hop-by-hop options header must be 847 * just after the IPv6 header, which fact is assured through 848 * the IPv6 input processing. 849 */ 850 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 851 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 852 struct ip6_hbh *hbh = (struct ip6_hbh *)(ip6 + 1); 853 854 /* 855 * XXX: We copy whole the header even if a jumbo 856 * payload option is included, which option is to 857 * be removed before returning in the RFC 2292. 858 * But it's too painful operation... 859 */ 860 *mp = sbcreatecontrol((caddr_t)hbh, 861 (hbh->ip6h_len + 1) << 3, 862 IPV6_HOPOPTS, IPPROTO_IPV6); 863 if (*mp) 864 mp = &(*mp)->m_next; 865 } 866 } 867 868 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 869 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 870 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 871 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 872 873 /* 874 * Search for destination options headers or routing 875 * header(s) through the header chain, and stores each 876 * header as ancillary data. 877 * Note that the order of the headers remains in 878 * the chain of ancillary data. 879 */ 880 while(1) { /* is explicit loop prevention necessary? */ 881 struct ip6_ext *ip6e = 882 (struct ip6_ext *)(mtod(m, caddr_t) + off); 883 884 switch(nxt) { 885 case IPPROTO_DSTOPTS: 886 if (!in6p->in6p_flags & IN6P_DSTOPTS) 887 break; 888 889 /* 890 * We also require super-user privilege for 891 * the option. 892 * See the comments on IN6_HOPOPTS. 893 */ 894 if (!privileged) 895 break; 896 897 *mp = sbcreatecontrol((caddr_t)ip6e, 898 (ip6e->ip6e_len + 1) << 3, 899 IPV6_DSTOPTS, 900 IPPROTO_IPV6); 901 if (*mp) 902 mp = &(*mp)->m_next; 903 break; 904 905 case IPPROTO_ROUTING: 906 if (!in6p->in6p_flags & IN6P_RTHDR) 907 break; 908 909 *mp = sbcreatecontrol((caddr_t)ip6e, 910 (ip6e->ip6e_len + 1) << 3, 911 IPV6_RTHDR, 912 IPPROTO_IPV6); 913 if (*mp) 914 mp = &(*mp)->m_next; 915 break; 916 917 case IPPROTO_UDP: 918 case IPPROTO_TCP: 919 case IPPROTO_ICMPV6: 920 default: 921 /* 922 * stop search if we encounter an upper 923 * layer protocol headers. 924 */ 925 goto loopend; 926 927 case IPPROTO_HOPOPTS: 928 case IPPROTO_AH: /* is it possible? */ 929 break; 930 } 931 932 /* proceed with the next header. */ 933 if (nxt == IPPROTO_AH) 934 off += (ip6e->ip6e_len + 2) << 2; 935 else 936 off += (ip6e->ip6e_len + 1) << 3; 937 nxt = ip6e->ip6e_nxt; 938 } 939 loopend: 940 } 941 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 942 /* to be done */ 943 } 944 if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { 945 /* to be done */ 946 } 947 /* IN6P_RTHDR - to be done */ 948 } 949 950 /* 951 * Get pointer to the previous header followed by the header 952 * currently processed. 953 * XXX: This function supposes that 954 * M includes all headers, 955 * the next header field and the header length field of each header 956 * are valid, and 957 * the sum of each header length equals to OFF. 958 * Because of these assumptions, this function must be called very 959 * carefully. Moreover, it will not be used in the near future when 960 * we develop `neater' mechanism to process extension headers. 961 */ 962 char * 963 ip6_get_prevhdr(m, off) 964 struct mbuf *m; 965 int off; 966 { 967 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 968 969 if (off == sizeof(struct ip6_hdr)) 970 return(&ip6->ip6_nxt); 971 else { 972 int len, nxt; 973 struct ip6_ext *ip6e = NULL; 974 975 nxt = ip6->ip6_nxt; 976 len = sizeof(struct ip6_hdr); 977 while (len < off) { 978 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 979 980 switch(nxt) { 981 case IPPROTO_FRAGMENT: 982 len += sizeof(struct ip6_frag); 983 break; 984 case IPPROTO_AH: 985 len += (ip6e->ip6e_len + 2) << 2; 986 break; 987 default: 988 len += (ip6e->ip6e_len + 1) << 3; 989 break; 990 } 991 nxt = ip6e->ip6e_nxt; 992 } 993 if (ip6e) 994 return(&ip6e->ip6e_nxt); 995 else 996 return NULL; 997 } 998 } 999 1000 /* 1001 * System control for IP6 1002 */ 1003 1004 u_char inet6ctlerrmap[PRC_NCMDS] = { 1005 0, 0, 0, 0, 1006 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1007 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1008 EMSGSIZE, EHOSTUNREACH, 0, 0, 1009 0, 0, 0, 0, 1010 ENOPROTOOPT 1011 }; 1012