1 /* $NetBSD: ip6_input.c,v 1.16 2000/02/20 00:56:43 darrenr 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 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pfil_hooks.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/if_dl.h> 88 #include <net/route.h> 89 #include <net/netisr.h> 90 #ifdef PFIL_HOOKS 91 #include <net/pfil.h> 92 #endif 93 94 #include <netinet/in.h> 95 #include <netinet/in_systm.h> 96 #ifdef INET 97 #include <netinet/ip.h> 98 #include <netinet/ip_icmp.h> 99 #endif /*INET*/ 100 #include <netinet/ip6.h> 101 #include <netinet6/in6_var.h> 102 #include <netinet6/ip6_var.h> 103 #include <netinet6/in6_pcb.h> 104 #include <netinet/icmp6.h> 105 #include <netinet6/in6_ifattach.h> 106 #include <netinet6/nd6.h> 107 #include <netinet6/in6_prefix.h> 108 109 #ifdef IPV6FIREWALL 110 #include <netinet6/ip6_fw.h> 111 #endif 112 113 #include <netinet6/ip6protosw.h> 114 115 /* we need it for NLOOP. */ 116 #include "loop.h" 117 #include "faith.h" 118 119 #include "gif.h" 120 #include "bpfilter.h" 121 122 #include <net/net_osdep.h> 123 124 extern struct domain inet6domain; 125 126 u_char ip6_protox[IPPROTO_MAX]; 127 static int ip6qmaxlen = IFQ_MAXLEN; 128 struct in6_ifaddr *in6_ifaddr; 129 struct ifqueue ip6intrq; 130 131 extern struct ifnet loif[NLOOP]; 132 int ip6_forward_srcrt; /* XXX */ 133 int ip6_sourcecheck; /* XXX */ 134 int ip6_sourcecheck_interval; /* XXX */ 135 136 #ifdef IPV6FIREWALL 137 /* firewall hooks */ 138 ip6_fw_chk_t *ip6_fw_chk_ptr; 139 ip6_fw_ctl_t *ip6_fw_ctl_ptr; 140 #endif 141 142 struct ip6stat ip6stat; 143 144 static void ip6_init2 __P((void *)); 145 146 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 147 148 #ifdef PTR 149 extern int ip6_protocol_tr; 150 151 int ptr_in6 __P((struct mbuf *, struct mbuf **)); 152 extern void ip_forward __P((struct mbuf *, int)); 153 #endif 154 155 /* 156 * IP6 initialization: fill in IP6 protocol switch table. 157 * All protocols not implemented in kernel go to raw IP6 protocol handler. 158 */ 159 void 160 ip6_init() 161 { 162 register struct ip6protosw *pr; 163 register int i; 164 struct timeval tv; 165 166 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 167 if (pr == 0) 168 panic("ip6_init"); 169 for (i = 0; i < IPPROTO_MAX; i++) 170 ip6_protox[i] = pr - inet6sw; 171 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 172 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 173 if (pr->pr_domain->dom_family == PF_INET6 && 174 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 175 ip6_protox[pr->pr_protocol] = pr - inet6sw; 176 ip6intrq.ifq_maxlen = ip6qmaxlen; 177 nd6_init(); 178 frag6_init(); 179 #ifdef IPV6FIREWALL 180 ip6_fw_init(); 181 #endif 182 /* 183 * in many cases, random() here does NOT return random number 184 * as initialization during bootstrap time occur in fixed order. 185 */ 186 microtime(&tv); 187 ip6_flow_seq = random() ^ tv.tv_usec; 188 189 ip6_init2((void *)0); 190 } 191 192 static void 193 ip6_init2(dummy) 194 void *dummy; 195 { 196 int ret; 197 198 /* get EUI64 from somewhere */ 199 ret = in6_ifattach_getifid(NULL); 200 201 /* 202 * to route local address of p2p link to loopback, 203 * assign loopback address first. 204 */ 205 in6_ifattach(&loif[0], IN6_IFT_LOOP, NULL, 0); 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 /* 214 * IP6 input interrupt handling. Just pass the packet to ip6_input. 215 */ 216 void 217 ip6intr() 218 { 219 int s; 220 struct mbuf *m; 221 222 for (;;) { 223 s = splimp(); 224 IF_DEQUEUE(&ip6intrq, m); 225 splx(s); 226 if (m == 0) 227 return; 228 ip6_input(m); 229 } 230 } 231 232 extern struct route_in6 ip6_forward_rt; 233 234 void 235 ip6_input(m) 236 struct mbuf *m; 237 { 238 struct ip6_hdr *ip6; 239 int off = sizeof(struct ip6_hdr), nest; 240 u_int32_t plen; 241 u_int32_t rtalert = ~0; 242 int nxt, ours = 0; 243 struct ifnet *deliverifp = NULL; 244 #ifdef PFIL_HOOKS 245 struct packet_filter_hook *pfh; 246 struct mbuf *m0; 247 int rv; 248 #endif /* PFIL_HOOKS */ 249 250 #ifdef IPSEC 251 /* 252 * should the inner packet be considered authentic? 253 * see comment in ah4_input(). 254 */ 255 if (m) { 256 m->m_flags &= ~M_AUTHIPHDR; 257 m->m_flags &= ~M_AUTHIPDGM; 258 } 259 #endif 260 261 /* 262 * mbuf statistics by kazu 263 */ 264 if (m->m_flags & M_EXT) { 265 if (m->m_next) 266 ip6stat.ip6s_mext2m++; 267 else 268 ip6stat.ip6s_mext1++; 269 } else { 270 if (m->m_next) { 271 if (m->m_flags & M_LOOP) { 272 ip6stat.ip6s_m2m[loif[0].if_index]++; /*XXX*/ 273 } 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 #ifndef PULLDOWN_TEST 286 /* XXX is the line really necessary? */ 287 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/); 288 #endif 289 290 if (m->m_len < sizeof(struct ip6_hdr)) { 291 struct ifnet *inifp; 292 inifp = m->m_pkthdr.rcvif; 293 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { 294 ip6stat.ip6s_toosmall++; 295 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 296 return; 297 } 298 } 299 300 ip6 = mtod(m, struct ip6_hdr *); 301 302 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 303 ip6stat.ip6s_badvers++; 304 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 305 goto bad; 306 } 307 308 #ifdef PFIL_HOOKS 309 /* 310 * Run through list of hooks for input packets. If there are any 311 * filters which require that additional packets in the flow are 312 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 313 * Note that filters must _never_ set this flag, as another filter 314 * in the list may have previously cleared it. 315 */ 316 m0 = m; 317 pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 318 for (; pfh; pfh = pfh->pfil_link.tqe_next) 319 if (pfh->pfil_func) { 320 rv = pfh->pfil_func(ip6, sizeof(*ip6), 321 m->m_pkthdr.rcvif, 0, &m0); 322 if (rv) 323 return; 324 m = m0; 325 if (m == NULL) 326 return; 327 ip6 = mtod(m, struct ip6_hdr *); 328 } 329 #endif /* PFIL_HOOKS */ 330 331 332 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 333 334 #ifdef IPV6FIREWALL 335 /* 336 * Check with the firewall... 337 */ 338 if (ip6_fw_chk_ptr) { 339 u_short port = 0; 340 /* If ipfw says divert, we have to just drop packet */ 341 /* use port as a dummy argument */ 342 if ((*ip6_fw_chk_ptr)(&ip6, NULL, &port, &m)) { 343 m_freem(m); 344 m = NULL; 345 } 346 if (!m) 347 return; 348 } 349 #endif 350 351 /* 352 * Scope check 353 */ 354 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 355 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 356 ip6stat.ip6s_badscope++; 357 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 358 goto bad; 359 } 360 /* 361 * The following check is not documented in the spec. Malicious party 362 * may be able to use IPv4 mapped addr to confuse tcp/udp stack and 363 * bypass security checks (act as if it was from 127.0.0.1 by using 364 * IPv6 src ::ffff:127.0.0.1). Be cautious. 365 */ 366 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 367 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 368 ip6stat.ip6s_badscope++; 369 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 370 goto bad; 371 } 372 #if 1 373 /* 374 * We don't support it, so it is strange to get this. 375 */ 376 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 377 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 378 ip6stat.ip6s_badscope++; 379 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 380 goto bad; 381 } 382 #endif 383 if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) || 384 IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) { 385 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 386 ours = 1; 387 deliverifp = m->m_pkthdr.rcvif; 388 goto hbhcheck; 389 } else { 390 ip6stat.ip6s_badscope++; 391 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 392 goto bad; 393 } 394 } 395 396 if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) { 397 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) { 398 ours = 1; 399 deliverifp = m->m_pkthdr.rcvif; 400 goto hbhcheck; 401 } 402 } else { 403 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 404 ip6->ip6_src.s6_addr16[1] 405 = htons(m->m_pkthdr.rcvif->if_index); 406 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 407 ip6->ip6_dst.s6_addr16[1] 408 = htons(m->m_pkthdr.rcvif->if_index); 409 } 410 411 #ifdef PTR 412 /* 413 * 414 */ 415 if (ip6_protocol_tr) 416 { 417 struct mbuf *m1 = NULL; 418 419 switch (ptr_in6(m, &m1)) 420 { 421 case IPPROTO_IP: goto mcastcheck; 422 case IPPROTO_IPV4: ip_forward(m1, 0); break; 423 case IPPROTO_IPV6: ip6_forward(m1, 0); break; 424 case IPPROTO_MAX: /* discard this packet */ 425 default: 426 } 427 428 if (m != m1) 429 m_freem(m); 430 431 return; 432 } 433 434 mcastcheck: 435 #endif 436 437 /* 438 * Multicast check 439 */ 440 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 441 struct in6_multi *in6m = 0; 442 443 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 444 /* 445 * See if we belong to the destination multicast group on the 446 * arrival interface. 447 */ 448 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 449 if (in6m) 450 ours = 1; 451 else if (!ip6_mrouter) { 452 ip6stat.ip6s_notmember++; 453 ip6stat.ip6s_cantforward++; 454 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 455 goto bad; 456 } 457 deliverifp = m->m_pkthdr.rcvif; 458 goto hbhcheck; 459 } 460 461 /* 462 * Unicast check 463 */ 464 if (ip6_forward_rt.ro_rt == 0 || 465 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 466 &ip6_forward_rt.ro_dst.sin6_addr)) { 467 if (ip6_forward_rt.ro_rt) { 468 RTFREE(ip6_forward_rt.ro_rt); 469 ip6_forward_rt.ro_rt = 0; 470 } 471 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 472 ip6_forward_rt.ro_dst.sin6_len = sizeof(struct sockaddr_in6); 473 ip6_forward_rt.ro_dst.sin6_family = AF_INET6; 474 ip6_forward_rt.ro_dst.sin6_addr = ip6->ip6_dst; 475 476 rtalloc((struct route *)&ip6_forward_rt); 477 } 478 479 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 480 481 /* 482 * Accept the packet if the forwarding interface to the destination 483 * according to the routing table is the loopback interface, 484 * unless the associated route has a gateway. 485 * Note that this approach causes to accept a packet if there is a 486 * route to the loopback interface for the destination of the packet. 487 * But we think it's even useful in some situations, e.g. when using 488 * a special daemon which wants to intercept the packet. 489 */ 490 if (ip6_forward_rt.ro_rt && 491 (ip6_forward_rt.ro_rt->rt_flags & 492 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 493 #if 0 494 /* 495 * The check below is redundant since the comparison of 496 * the destination and the key of the rtentry has 497 * already done through looking up the routing table. 498 */ 499 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 500 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 501 #endif 502 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 503 struct in6_ifaddr *ia6 = 504 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 505 /* packet to tentative address must not be received */ 506 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 507 m->m_flags |= M_ANYCAST6; 508 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 509 /* this interface is ready */ 510 ours = 1; 511 deliverifp = ia6->ia_ifp; /* correct? */ 512 goto hbhcheck; 513 } else { 514 /* this interface is not ready, fall through */ 515 } 516 } 517 518 /* 519 * FAITH(Firewall Aided Internet Translator) 520 */ 521 #if defined(NFAITH) && 0 < NFAITH 522 if (ip6_keepfaith) { 523 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp 524 && ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 525 /* XXX do we need more sanity checks? */ 526 ours = 1; 527 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /*faith*/ 528 goto hbhcheck; 529 } 530 } 531 #endif 532 533 #if 0 534 { 535 /* 536 * Last resort: check in6_ifaddr for incoming interface. 537 * The code is here until I update the "goto ours hack" code above 538 * working right. 539 */ 540 struct ifaddr *ifa; 541 for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; 542 ifa; 543 ifa = ifa->ifa_list.tqe_next) { 544 if (ifa->ifa_addr == NULL) 545 continue; /* just for safety */ 546 if (ifa->ifa_addr->sa_family != AF_INET6) 547 continue; 548 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 549 ours = 1; 550 deliverifp = ifa->ifa_ifp; 551 goto hbhcheck; 552 } 553 } 554 } 555 #endif 556 557 /* 558 * Now there is no reason to process the packet if it's not our own 559 * and we're not a router. 560 */ 561 if (!ip6_forwarding) { 562 ip6stat.ip6s_cantforward++; 563 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 564 goto bad; 565 } 566 567 hbhcheck: 568 /* 569 * Process Hop-by-Hop options header if it's contained. 570 * m may be modified in ip6_hopopts_input(). 571 * If a JumboPayload option is included, plen will also be modified. 572 */ 573 plen = (u_int32_t)ntohs(ip6->ip6_plen); 574 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 575 struct ip6_hbh *hbh; 576 577 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 578 #if 0 /*touches NULL pointer*/ 579 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 580 #endif 581 return; /* m have already been freed */ 582 } 583 /* adjust pointer */ 584 ip6 = mtod(m, struct ip6_hdr *); 585 #ifndef PULLDOWN_TEST 586 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 587 hbh = (struct ip6_hbh *)(ip6 + 1); 588 #else 589 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 590 sizeof(struct ip6_hbh)); 591 if (hbh == NULL) { 592 ip6stat.ip6s_tooshort++; 593 return; 594 } 595 #endif 596 nxt = hbh->ip6h_nxt; 597 598 /* 599 * accept the packet if a router alert option is included 600 * and we act as an IPv6 router. 601 */ 602 if (rtalert != ~0 && ip6_forwarding) 603 ours = 1; 604 } else 605 nxt = ip6->ip6_nxt; 606 607 /* 608 * Check that the amount of data in the buffers 609 * is as at least much as the IPv6 header would have us expect. 610 * Trim mbufs if longer than we expect. 611 * Drop packet if shorter than we expect. 612 */ 613 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 614 ip6stat.ip6s_tooshort++; 615 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 616 goto bad; 617 } 618 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 619 if (m->m_len == m->m_pkthdr.len) { 620 m->m_len = sizeof(struct ip6_hdr) + plen; 621 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 622 } else 623 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 624 } 625 626 /* 627 * Forward if desirable. 628 */ 629 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 630 /* 631 * If we are acting as a multicast router, all 632 * incoming multicast packets are passed to the 633 * kernel-level multicast forwarding function. 634 * The packet is returned (relatively) intact; if 635 * ip6_mforward() returns a non-zero value, the packet 636 * must be discarded, else it may be accepted below. 637 */ 638 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 639 ip6stat.ip6s_cantforward++; 640 m_freem(m); 641 return; 642 } 643 if (!ours) { 644 m_freem(m); 645 return; 646 } 647 } 648 else if (!ours) { 649 ip6_forward(m, 0); 650 return; 651 } 652 653 /* 654 * Tell launch routine the next header 655 */ 656 #ifdef IFA_STATS 657 if (IFA_STATS && deliverifp != NULL) { 658 struct in6_ifaddr *ia6; 659 ip6 = mtod(m, struct ip6_hdr *); 660 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 661 if (ia6) 662 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 663 } 664 #endif 665 ip6stat.ip6s_delivered++; 666 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 667 nest = 0; 668 while (nxt != IPPROTO_DONE) { 669 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 670 ip6stat.ip6s_toomanyhdr++; 671 goto bad; 672 } 673 674 /* 675 * protection against faulty packet - there should be 676 * more sanity checks in header chain processing. 677 */ 678 if (m->m_pkthdr.len < off) { 679 ip6stat.ip6s_tooshort++; 680 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 681 goto bad; 682 } 683 684 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 685 } 686 return; 687 bad: 688 m_freem(m); 689 } 690 691 /* 692 * Hop-by-Hop options header processing. If a valid jumbo payload option is 693 * included, the real payload length will be stored in plenp. 694 */ 695 static int 696 ip6_hopopts_input(plenp, rtalertp, mp, offp) 697 u_int32_t *plenp; 698 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 699 struct mbuf **mp; 700 int *offp; 701 { 702 register struct mbuf *m = *mp; 703 int off = *offp, hbhlen; 704 struct ip6_hbh *hbh; 705 u_int8_t *opt; 706 707 /* validation of the length of the header */ 708 #ifndef PULLDOWN_TEST 709 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 710 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 711 hbhlen = (hbh->ip6h_len + 1) << 3; 712 713 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 714 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 715 #else 716 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 717 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 718 if (hbh == NULL) { 719 ip6stat.ip6s_tooshort++; 720 return -1; 721 } 722 hbhlen = (hbh->ip6h_len + 1) << 3; 723 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 724 hbhlen); 725 if (hbh == NULL) { 726 ip6stat.ip6s_tooshort++; 727 return -1; 728 } 729 #endif 730 off += hbhlen; 731 hbhlen -= sizeof(struct ip6_hbh); 732 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 733 734 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 735 hbhlen, rtalertp, plenp) < 0) 736 return(-1); 737 738 *offp = off; 739 *mp = m; 740 return(0); 741 } 742 743 /* 744 * Search header for all Hop-by-hop options and process each option. 745 * This function is separate from ip6_hopopts_input() in order to 746 * handle a case where the sending node itself process its hop-by-hop 747 * options header. In such a case, the function is called from ip6_output(). 748 */ 749 int 750 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 751 struct mbuf *m; 752 u_int8_t *opthead; 753 int hbhlen; 754 u_int32_t *rtalertp; 755 u_int32_t *plenp; 756 { 757 struct ip6_hdr *ip6; 758 int optlen = 0; 759 u_int8_t *opt = opthead; 760 u_int16_t rtalert_val; 761 762 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 763 switch(*opt) { 764 case IP6OPT_PAD1: 765 optlen = 1; 766 break; 767 case IP6OPT_PADN: 768 if (hbhlen < IP6OPT_MINLEN) { 769 ip6stat.ip6s_toosmall++; 770 goto bad; 771 } 772 optlen = *(opt + 1) + 2; 773 break; 774 case IP6OPT_RTALERT: 775 /* XXX may need check for alignment */ 776 if (hbhlen < IP6OPT_RTALERT_LEN) { 777 ip6stat.ip6s_toosmall++; 778 goto bad; 779 } 780 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) 781 /* XXX: should we discard the packet? */ 782 log(LOG_ERR, "length of router alert opt is inconsitent(%d)", 783 *(opt + 1)); 784 optlen = IP6OPT_RTALERT_LEN; 785 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 786 *rtalertp = ntohs(rtalert_val); 787 break; 788 case IP6OPT_JUMBO: 789 /* XXX may need check for alignment */ 790 if (hbhlen < IP6OPT_JUMBO_LEN) { 791 ip6stat.ip6s_toosmall++; 792 goto bad; 793 } 794 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) 795 /* XXX: should we discard the packet? */ 796 log(LOG_ERR, "length of jumbopayload opt " 797 "is inconsistent(%d)", 798 *(opt + 1)); 799 optlen = IP6OPT_JUMBO_LEN; 800 801 /* 802 * We can simply cast because of the alignment 803 * requirement of the jumbo payload option. 804 */ 805 #if 0 806 *plenp = ntohl(*(u_int32_t *)(opt + 2)); 807 #else 808 bcopy(opt + 2, plenp, sizeof(*plenp)); 809 *plenp = htonl(*plenp); 810 #endif 811 if (*plenp <= IPV6_MAXPACKET) { 812 /* 813 * jumbo payload length must be larger 814 * than 65535 815 */ 816 ip6stat.ip6s_badoptions++; 817 icmp6_error(m, ICMP6_PARAM_PROB, 818 ICMP6_PARAMPROB_HEADER, 819 sizeof(struct ip6_hdr) + 820 sizeof(struct ip6_hbh) + 821 opt + 2 - opthead); 822 return(-1); 823 } 824 825 ip6 = mtod(m, struct ip6_hdr *); 826 if (ip6->ip6_plen) { 827 /* 828 * IPv6 packets that have non 0 payload length 829 * must not contain a jumbo paylod option. 830 */ 831 ip6stat.ip6s_badoptions++; 832 icmp6_error(m, ICMP6_PARAM_PROB, 833 ICMP6_PARAMPROB_HEADER, 834 sizeof(struct ip6_hdr) + 835 sizeof(struct ip6_hbh) + 836 opt - opthead); 837 return(-1); 838 } 839 break; 840 default: /* unknown option */ 841 if (hbhlen < IP6OPT_MINLEN) { 842 ip6stat.ip6s_toosmall++; 843 goto bad; 844 } 845 if ((optlen = ip6_unknown_opt(opt, m, 846 sizeof(struct ip6_hdr) + 847 sizeof(struct ip6_hbh) + 848 opt - opthead)) == -1) 849 return(-1); 850 optlen += 2; 851 break; 852 } 853 } 854 855 return(0); 856 857 bad: 858 m_freem(m); 859 return(-1); 860 } 861 862 /* 863 * Unknown option processing. 864 * The third argument `off' is the offset from the IPv6 header to the option, 865 * which is necessary if the IPv6 header the and option header and IPv6 header 866 * is not continuous in order to return an ICMPv6 error. 867 */ 868 int 869 ip6_unknown_opt(optp, m, off) 870 u_int8_t *optp; 871 struct mbuf *m; 872 int off; 873 { 874 struct ip6_hdr *ip6; 875 876 switch(IP6OPT_TYPE(*optp)) { 877 case IP6OPT_TYPE_SKIP: /* ignore the option */ 878 return((int)*(optp + 1)); 879 case IP6OPT_TYPE_DISCARD: /* silently discard */ 880 m_freem(m); 881 return(-1); 882 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 883 ip6stat.ip6s_badoptions++; 884 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 885 return(-1); 886 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 887 ip6stat.ip6s_badoptions++; 888 ip6 = mtod(m, struct ip6_hdr *); 889 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 890 (m->m_flags & (M_BCAST|M_MCAST))) 891 m_freem(m); 892 else 893 icmp6_error(m, ICMP6_PARAM_PROB, 894 ICMP6_PARAMPROB_OPTION, off); 895 return(-1); 896 } 897 898 m_freem(m); /* XXX: NOTREACHED */ 899 return(-1); 900 } 901 902 /* 903 * Create the "control" list for this pcb. 904 * 905 * The routine will be called from upper layer handlers like tcp6_input(). 906 * Thus the routine assumes that the caller (tcp6_input) have already 907 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 908 * very first mbuf on the mbuf chain. 909 * We may want to add some infinite loop prevention or sanity checks for safety. 910 * (This applies only when you are using KAME mbuf chain restriction, i.e. 911 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 912 */ 913 void 914 ip6_savecontrol(in6p, mp, ip6, m) 915 register struct in6pcb *in6p; 916 register struct mbuf **mp; 917 register struct ip6_hdr *ip6; 918 register struct mbuf *m; 919 { 920 struct proc *p = curproc; /* XXX */ 921 int privileged; 922 923 privileged = 0; 924 if (p && !suser(p->p_ucred, &p->p_acflag)) 925 privileged++; 926 927 #ifdef SO_TIMESTAMP 928 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 929 struct timeval tv; 930 931 microtime(&tv); 932 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 933 SCM_TIMESTAMP, SOL_SOCKET); 934 if (*mp) 935 mp = &(*mp)->m_next; 936 } 937 #endif 938 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 939 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 940 sizeof(struct in6_addr), IPV6_RECVDSTADDR, 941 IPPROTO_IPV6); 942 if (*mp) 943 mp = &(*mp)->m_next; 944 } 945 946 #ifdef noyet 947 /* options were tossed above */ 948 if (in6p->in6p_flags & IN6P_RECVOPTS) 949 /* broken */ 950 /* ip6_srcroute doesn't do what we want here, need to fix */ 951 if (in6p->in6p_flags & IPV6P_RECVRETOPTS) 952 /* broken */ 953 #endif 954 955 /* RFC 2292 sec. 5 */ 956 if (in6p->in6p_flags & IN6P_PKTINFO) { 957 struct in6_pktinfo pi6; 958 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 959 if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr)) 960 pi6.ipi6_addr.s6_addr16[1] = 0; 961 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 962 ? m->m_pkthdr.rcvif->if_index 963 : 0; 964 *mp = sbcreatecontrol((caddr_t) &pi6, 965 sizeof(struct in6_pktinfo), IPV6_PKTINFO, 966 IPPROTO_IPV6); 967 if (*mp) 968 mp = &(*mp)->m_next; 969 } 970 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 971 int hlim = ip6->ip6_hlim & 0xff; 972 *mp = sbcreatecontrol((caddr_t) &hlim, 973 sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6); 974 if (*mp) 975 mp = &(*mp)->m_next; 976 } 977 /* IN6P_NEXTHOP - for outgoing packet only */ 978 979 /* 980 * IPV6_HOPOPTS socket option. We require super-user privilege 981 * for the option, but it might be too strict, since there might 982 * be some hop-by-hop options which can be returned to normal user. 983 * See RFC 2292 section 6. 984 */ 985 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 986 /* 987 * Check if a hop-by-hop options header is contatined in the 988 * received packet, and if so, store the options as ancillary 989 * data. Note that a hop-by-hop options header must be 990 * just after the IPv6 header, which fact is assured through 991 * the IPv6 input processing. 992 */ 993 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 994 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 995 struct ip6_hbh *hbh; 996 int hbhlen; 997 998 #ifndef PULLDOWN_TEST 999 hbh = (struct ip6_hbh *)(ip6 + 1); 1000 hbhlen = (hbh->ip6h_len + 1) << 3; 1001 #else 1002 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1003 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1004 if (hbh == NULL) { 1005 ip6stat.ip6s_tooshort++; 1006 return; 1007 } 1008 hbhlen = (hbh->ip6h_len + 1) << 3; 1009 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1010 sizeof(struct ip6_hdr), hbhlen); 1011 if (hbh == NULL) { 1012 ip6stat.ip6s_tooshort++; 1013 return; 1014 } 1015 #endif 1016 1017 /* 1018 * XXX: We copy whole the header even if a jumbo 1019 * payload option is included, which option is to 1020 * be removed before returning in the RFC 2292. 1021 * But it's too painful operation... 1022 */ 1023 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1024 IPV6_HOPOPTS, IPPROTO_IPV6); 1025 if (*mp) 1026 mp = &(*mp)->m_next; 1027 } 1028 } 1029 1030 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1031 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1032 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1033 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);; 1034 1035 /* 1036 * Search for destination options headers or routing 1037 * header(s) through the header chain, and stores each 1038 * header as ancillary data. 1039 * Note that the order of the headers remains in 1040 * the chain of ancillary data. 1041 */ 1042 while(1) { /* is explicit loop prevention necessary? */ 1043 struct ip6_ext *ip6e; 1044 int elen; 1045 1046 #ifndef PULLDOWN_TEST 1047 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1048 if (nxt == IPPROTO_AH) 1049 elen = (ip6e->ip6e_len + 2) << 2; 1050 else 1051 elen = (ip6e->ip6e_len + 1) << 3; 1052 #else 1053 IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, 1054 sizeof(struct ip6_ext)); 1055 if (ip6e == NULL) { 1056 ip6stat.ip6s_tooshort++; 1057 return; 1058 } 1059 if (nxt == IPPROTO_AH) 1060 elen = (ip6e->ip6e_len + 2) << 2; 1061 else 1062 elen = (ip6e->ip6e_len + 1) << 3; 1063 IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen); 1064 if (ip6e == NULL) { 1065 ip6stat.ip6s_tooshort++; 1066 return; 1067 } 1068 #endif 1069 1070 switch(nxt) { 1071 case IPPROTO_DSTOPTS: 1072 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1073 break; 1074 1075 /* 1076 * We also require super-user privilege for 1077 * the option. 1078 * See the comments on IN6_HOPOPTS. 1079 */ 1080 if (!privileged) 1081 break; 1082 1083 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1084 IPV6_DSTOPTS, 1085 IPPROTO_IPV6); 1086 if (*mp) 1087 mp = &(*mp)->m_next; 1088 break; 1089 1090 case IPPROTO_ROUTING: 1091 if (!in6p->in6p_flags & IN6P_RTHDR) 1092 break; 1093 1094 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1095 IPV6_RTHDR, 1096 IPPROTO_IPV6); 1097 if (*mp) 1098 mp = &(*mp)->m_next; 1099 break; 1100 1101 case IPPROTO_UDP: 1102 case IPPROTO_TCP: 1103 case IPPROTO_ICMPV6: 1104 default: 1105 /* 1106 * stop search if we encounter an upper 1107 * layer protocol headers. 1108 */ 1109 goto loopend; 1110 1111 case IPPROTO_HOPOPTS: 1112 case IPPROTO_AH: /* is it possible? */ 1113 break; 1114 } 1115 1116 /* proceed with the next header. */ 1117 off += elen; 1118 nxt = ip6e->ip6e_nxt; 1119 } 1120 loopend: 1121 } 1122 if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) { 1123 /* to be done */ 1124 } 1125 if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) { 1126 /* to be done */ 1127 } 1128 /* IN6P_RTHDR - to be done */ 1129 1130 } 1131 1132 /* 1133 * Get pointer to the previous header followed by the header 1134 * currently processed. 1135 * XXX: This function supposes that 1136 * M includes all headers, 1137 * the next header field and the header length field of each header 1138 * are valid, and 1139 * the sum of each header length equals to OFF. 1140 * Because of these assumptions, this function must be called very 1141 * carefully. Moreover, it will not be used in the near future when 1142 * we develop `neater' mechanism to process extension headers. 1143 */ 1144 char * 1145 ip6_get_prevhdr(m, off) 1146 struct mbuf *m; 1147 int off; 1148 { 1149 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1150 1151 if (off == sizeof(struct ip6_hdr)) 1152 return(&ip6->ip6_nxt); 1153 else { 1154 int len, nxt; 1155 struct ip6_ext *ip6e = NULL; 1156 1157 nxt = ip6->ip6_nxt; 1158 len = sizeof(struct ip6_hdr); 1159 while (len < off) { 1160 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1161 1162 switch(nxt) { 1163 case IPPROTO_FRAGMENT: 1164 len += sizeof(struct ip6_frag); 1165 break; 1166 case IPPROTO_AH: 1167 len += (ip6e->ip6e_len + 2) << 2; 1168 break; 1169 default: 1170 len += (ip6e->ip6e_len + 1) << 3; 1171 break; 1172 } 1173 nxt = ip6e->ip6e_nxt; 1174 } 1175 if (ip6e) 1176 return(&ip6e->ip6e_nxt); 1177 else 1178 return NULL; 1179 } 1180 } 1181 1182 /* 1183 * System control for IP6 1184 */ 1185 1186 u_char inet6ctlerrmap[PRC_NCMDS] = { 1187 0, 0, 0, 0, 1188 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1189 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1190 EMSGSIZE, EHOSTUNREACH, 0, 0, 1191 0, 0, 0, 0, 1192 ENOPROTOOPT 1193 }; 1194 1195 #include <vm/vm.h> 1196 #include <sys/sysctl.h> 1197 1198 int 1199 ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 1200 int *name; 1201 u_int namelen; 1202 void *oldp; 1203 size_t *oldlenp; 1204 void *newp; 1205 size_t newlen; 1206 { 1207 /* All sysctl names at this level are terminal. */ 1208 if (namelen != 1) 1209 return ENOTDIR; 1210 1211 switch (name[0]) { 1212 1213 case IPV6CTL_FORWARDING: 1214 return sysctl_int(oldp, oldlenp, newp, newlen, 1215 &ip6_forwarding); 1216 case IPV6CTL_SENDREDIRECTS: 1217 return sysctl_int(oldp, oldlenp, newp, newlen, 1218 &ip6_sendredirects); 1219 case IPV6CTL_DEFHLIM: 1220 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim); 1221 case IPV6CTL_MAXFRAGPACKETS: 1222 return sysctl_int(oldp, oldlenp, newp, newlen, 1223 &ip6_maxfragpackets); 1224 case IPV6CTL_ACCEPT_RTADV: 1225 return sysctl_int(oldp, oldlenp, newp, newlen, 1226 &ip6_accept_rtadv); 1227 case IPV6CTL_KEEPFAITH: 1228 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith); 1229 case IPV6CTL_LOG_INTERVAL: 1230 return sysctl_int(oldp, oldlenp, newp, newlen, 1231 &ip6_log_interval); 1232 case IPV6CTL_HDRNESTLIMIT: 1233 return sysctl_int(oldp, oldlenp, newp, newlen, 1234 &ip6_hdrnestlimit); 1235 case IPV6CTL_DAD_COUNT: 1236 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count); 1237 case IPV6CTL_AUTO_FLOWLABEL: 1238 return sysctl_int(oldp, oldlenp, newp, newlen, 1239 &ip6_auto_flowlabel); 1240 case IPV6CTL_DEFMCASTHLIM: 1241 return sysctl_int(oldp, oldlenp, newp, newlen, 1242 &ip6_defmcasthlim); 1243 case IPV6CTL_GIF_HLIM: 1244 return sysctl_int(oldp, oldlenp, newp, newlen, 1245 &ip6_gif_hlim); 1246 case IPV6CTL_KAME_VERSION: 1247 return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION); 1248 case IPV6CTL_USE_DEPRECATED: 1249 return sysctl_int(oldp, oldlenp, newp, newlen, 1250 &ip6_use_deprecated); 1251 case IPV6CTL_RR_PRUNE: 1252 return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune); 1253 #ifndef INET6_BINDV6ONLY 1254 case IPV6CTL_BINDV6ONLY: 1255 return sysctl_int(oldp, oldlenp, newp, newlen, 1256 &ip6_bindv6only); 1257 #endif 1258 default: 1259 return EOPNOTSUPP; 1260 } 1261 /* NOTREACHED */ 1262 } 1263