1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/ip6_output.c,v 1.9 2003/12/02 08:00:22 asmodai Exp $ */ 3 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 67 */ 68 69 #include "opt_ip6fw.h" 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 #include "opt_pfil_hooks.h" 74 75 #include <sys/param.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/errno.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/systm.h> 83 #include <sys/kernel.h> 84 #include <sys/proc.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #ifdef PFIL_HOOKS 89 #include <net/pfil.h> 90 #endif 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet6/in6_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet/in_pcb.h> 99 #include <netinet6/nd6.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #ifdef INET6 104 #include <netinet6/ipsec6.h> 105 #endif 106 #include <netproto/key/key.h> 107 #endif /* IPSEC */ 108 109 #ifdef FAST_IPSEC 110 #include "ipsec.h" 111 #include "ipsec6.h" 112 #include <netipsec/key.h> 113 #endif /* FAST_IPSEC */ 114 115 #include <net/ip6fw/ip6_fw.h> 116 117 #include <net/net_osdep.h> 118 119 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 120 121 struct ip6_exthdrs { 122 struct mbuf *ip6e_ip6; 123 struct mbuf *ip6e_hbh; 124 struct mbuf *ip6e_dest1; 125 struct mbuf *ip6e_rthdr; 126 struct mbuf *ip6e_dest2; 127 }; 128 129 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 130 struct socket *, struct sockopt *sopt); 131 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 132 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 133 static int ip6_copyexthdr (struct mbuf **, caddr_t, int); 134 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 135 struct ip6_frag **); 136 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 137 static int ip6_splithdr (struct mbuf *, struct ip6_exthdrs *); 138 139 /* 140 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 141 * header (with pri, len, nxt, hlim, src, dst). 142 * This function may modify ver and hlim only. 143 * The mbuf chain containing the packet will be freed. 144 * The mbuf opt, if present, will not be freed. 145 * 146 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 147 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 148 * which is rt_rmx.rmx_mtu. 149 */ 150 int 151 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 152 struct mbuf *m0; 153 struct ip6_pktopts *opt; 154 struct route_in6 *ro; 155 int flags; 156 struct ip6_moptions *im6o; 157 struct ifnet **ifpp; /* XXX: just for statistics */ 158 struct inpcb *inp; 159 { 160 struct ip6_hdr *ip6, *mhip6; 161 struct ifnet *ifp, *origifp; 162 struct mbuf *m = m0; 163 int hlen, tlen, len, off; 164 struct route_in6 ip6route; 165 struct sockaddr_in6 *dst; 166 int error = 0; 167 struct in6_ifaddr *ia = NULL; 168 u_long mtu; 169 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 170 struct ip6_exthdrs exthdrs; 171 struct in6_addr finaldst; 172 struct route_in6 *ro_pmtu = NULL; 173 int hdrsplit = 0; 174 int needipsec = 0; 175 #ifdef IPSEC 176 int needipsectun = 0; 177 struct secpolicy *sp = NULL; 178 struct socket *so = inp ? inp->inp_socket : NULL; 179 180 ip6 = mtod(m, struct ip6_hdr *); 181 #endif /* IPSEC */ 182 #ifdef FAST_IPSEC 183 int needipsectun = 0; 184 struct secpolicy *sp = NULL; 185 186 ip6 = mtod(m, struct ip6_hdr *); 187 #endif /* FAST_IPSEC */ 188 189 #define MAKE_EXTHDR(hp, mp) \ 190 do { \ 191 if (hp) { \ 192 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 193 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 194 ((eh)->ip6e_len + 1) << 3); \ 195 if (error) \ 196 goto freehdrs; \ 197 } \ 198 } while (0) 199 200 bzero(&exthdrs, sizeof(exthdrs)); 201 202 if (opt) { 203 /* Hop-by-Hop options header */ 204 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 205 /* Destination options header(1st part) */ 206 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 207 /* Routing header */ 208 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 209 /* Destination options header(2nd part) */ 210 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 211 } 212 213 #ifdef IPSEC 214 /* get a security policy for this packet */ 215 if (so == NULL) 216 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 217 else 218 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 219 220 if (sp == NULL) { 221 ipsec6stat.out_inval++; 222 goto freehdrs; 223 } 224 225 error = 0; 226 227 /* check policy */ 228 switch (sp->policy) { 229 case IPSEC_POLICY_DISCARD: 230 /* 231 * This packet is just discarded. 232 */ 233 ipsec6stat.out_polvio++; 234 goto freehdrs; 235 236 case IPSEC_POLICY_BYPASS: 237 case IPSEC_POLICY_NONE: 238 /* no need to do IPsec. */ 239 needipsec = 0; 240 break; 241 242 case IPSEC_POLICY_IPSEC: 243 if (sp->req == NULL) { 244 /* acquire a policy */ 245 error = key_spdacquire(sp); 246 goto freehdrs; 247 } 248 needipsec = 1; 249 break; 250 251 case IPSEC_POLICY_ENTRUST: 252 default: 253 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 254 } 255 #endif /* IPSEC */ 256 #ifdef FAST_IPSEC 257 /* get a security policy for this packet */ 258 if (inp == NULL) 259 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 260 else 261 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 262 263 if (sp == NULL) { 264 newipsecstat.ips_out_inval++; 265 goto freehdrs; 266 } 267 268 error = 0; 269 270 /* check policy */ 271 switch (sp->policy) { 272 case IPSEC_POLICY_DISCARD: 273 /* 274 * This packet is just discarded. 275 */ 276 newipsecstat.ips_out_polvio++; 277 goto freehdrs; 278 279 case IPSEC_POLICY_BYPASS: 280 case IPSEC_POLICY_NONE: 281 /* no need to do IPsec. */ 282 needipsec = 0; 283 break; 284 285 case IPSEC_POLICY_IPSEC: 286 if (sp->req == NULL) { 287 /* acquire a policy */ 288 error = key_spdacquire(sp); 289 goto freehdrs; 290 } 291 needipsec = 1; 292 break; 293 294 case IPSEC_POLICY_ENTRUST: 295 default: 296 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 297 } 298 #endif /* FAST_IPSEC */ 299 300 /* 301 * Calculate the total length of the extension header chain. 302 * Keep the length of the unfragmentable part for fragmentation. 303 */ 304 optlen = 0; 305 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 306 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 307 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 308 unfragpartlen = optlen + sizeof(struct ip6_hdr); 309 /* NOTE: we don't add AH/ESP length here. do that later. */ 310 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 311 312 /* 313 * If we need IPsec, or there is at least one extension header, 314 * separate IP6 header from the payload. 315 */ 316 if ((needipsec || optlen) && !hdrsplit) { 317 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 318 m = NULL; 319 goto freehdrs; 320 } 321 m = exthdrs.ip6e_ip6; 322 hdrsplit++; 323 } 324 325 /* adjust pointer */ 326 ip6 = mtod(m, struct ip6_hdr *); 327 328 /* adjust mbuf packet header length */ 329 m->m_pkthdr.len += optlen; 330 plen = m->m_pkthdr.len - sizeof(*ip6); 331 332 /* If this is a jumbo payload, insert a jumbo payload option. */ 333 if (plen > IPV6_MAXPACKET) { 334 if (!hdrsplit) { 335 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 336 m = NULL; 337 goto freehdrs; 338 } 339 m = exthdrs.ip6e_ip6; 340 hdrsplit++; 341 } 342 /* adjust pointer */ 343 ip6 = mtod(m, struct ip6_hdr *); 344 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 345 goto freehdrs; 346 ip6->ip6_plen = 0; 347 } else 348 ip6->ip6_plen = htons(plen); 349 350 /* 351 * Concatenate headers and fill in next header fields. 352 * Here we have, on "m" 353 * IPv6 payload 354 * and we insert headers accordingly. Finally, we should be getting: 355 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 356 * 357 * during the header composing process, "m" points to IPv6 header. 358 * "mprev" points to an extension header prior to esp. 359 */ 360 { 361 u_char *nexthdrp = &ip6->ip6_nxt; 362 struct mbuf *mprev = m; 363 364 /* 365 * we treat dest2 specially. this makes IPsec processing 366 * much easier. the goal here is to make mprev point the 367 * mbuf prior to dest2. 368 * 369 * result: IPv6 dest2 payload 370 * m and mprev will point to IPv6 header. 371 */ 372 if (exthdrs.ip6e_dest2) { 373 if (!hdrsplit) 374 panic("assumption failed: hdr not split"); 375 exthdrs.ip6e_dest2->m_next = m->m_next; 376 m->m_next = exthdrs.ip6e_dest2; 377 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 378 ip6->ip6_nxt = IPPROTO_DSTOPTS; 379 } 380 381 #define MAKE_CHAIN(m, mp, p, i)\ 382 do {\ 383 if (m) {\ 384 if (!hdrsplit) \ 385 panic("assumption failed: hdr not split"); \ 386 *mtod((m), u_char *) = *(p);\ 387 *(p) = (i);\ 388 p = mtod((m), u_char *);\ 389 (m)->m_next = (mp)->m_next;\ 390 (mp)->m_next = (m);\ 391 (mp) = (m);\ 392 }\ 393 } while (0) 394 /* 395 * result: IPv6 hbh dest1 rthdr dest2 payload 396 * m will point to IPv6 header. mprev will point to the 397 * extension header prior to dest2 (rthdr in the above case). 398 */ 399 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 400 nexthdrp, IPPROTO_HOPOPTS); 401 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 402 nexthdrp, IPPROTO_DSTOPTS); 403 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 404 nexthdrp, IPPROTO_ROUTING); 405 406 #if defined(IPSEC) || defined(FAST_IPSEC) 407 if (!needipsec) 408 goto skip_ipsec2; 409 410 /* 411 * pointers after IPsec headers are not valid any more. 412 * other pointers need a great care too. 413 * (IPsec routines should not mangle mbufs prior to AH/ESP) 414 */ 415 exthdrs.ip6e_dest2 = NULL; 416 417 { 418 struct ip6_rthdr *rh = NULL; 419 int segleft_org = 0; 420 struct ipsec_output_state state; 421 422 if (exthdrs.ip6e_rthdr) { 423 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 424 segleft_org = rh->ip6r_segleft; 425 rh->ip6r_segleft = 0; 426 } 427 428 bzero(&state, sizeof(state)); 429 state.m = m; 430 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 431 &needipsectun); 432 m = state.m; 433 if (error) { 434 /* mbuf is already reclaimed in ipsec6_output_trans. */ 435 m = NULL; 436 switch (error) { 437 case EHOSTUNREACH: 438 case ENETUNREACH: 439 case EMSGSIZE: 440 case ENOBUFS: 441 case ENOMEM: 442 break; 443 default: 444 printf("ip6_output (ipsec): error code %d\n", error); 445 /* fall through */ 446 case ENOENT: 447 /* don't show these error codes to the user */ 448 error = 0; 449 break; 450 } 451 goto bad; 452 } 453 if (exthdrs.ip6e_rthdr) { 454 /* ah6_output doesn't modify mbuf chain */ 455 rh->ip6r_segleft = segleft_org; 456 } 457 } 458 skip_ipsec2:; 459 #endif 460 } 461 462 /* 463 * If there is a routing header, replace destination address field 464 * with the first hop of the routing header. 465 */ 466 if (exthdrs.ip6e_rthdr) { 467 struct ip6_rthdr *rh = 468 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 469 struct ip6_rthdr *)); 470 struct ip6_rthdr0 *rh0; 471 472 finaldst = ip6->ip6_dst; 473 switch (rh->ip6r_type) { 474 case IPV6_RTHDR_TYPE_0: 475 rh0 = (struct ip6_rthdr0 *)rh; 476 ip6->ip6_dst = rh0->ip6r0_addr[0]; 477 bcopy((caddr_t)&rh0->ip6r0_addr[1], 478 (caddr_t)&rh0->ip6r0_addr[0], 479 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 480 ); 481 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 482 break; 483 default: /* is it possible? */ 484 error = EINVAL; 485 goto bad; 486 } 487 } 488 489 /* Source address validation */ 490 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 491 (flags & IPV6_DADOUTPUT) == 0) { 492 error = EOPNOTSUPP; 493 ip6stat.ip6s_badscope++; 494 goto bad; 495 } 496 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 497 error = EOPNOTSUPP; 498 ip6stat.ip6s_badscope++; 499 goto bad; 500 } 501 502 ip6stat.ip6s_localout++; 503 504 /* 505 * Route packet. 506 */ 507 if (ro == 0) { 508 ro = &ip6route; 509 bzero((caddr_t)ro, sizeof(*ro)); 510 } 511 ro_pmtu = ro; 512 if (opt && opt->ip6po_rthdr) 513 ro = &opt->ip6po_route; 514 dst = (struct sockaddr_in6 *)&ro->ro_dst; 515 /* 516 * If there is a cached route, 517 * check that it is to the same destination 518 * and is still up. If not, free it and try again. 519 */ 520 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 521 dst->sin6_family != AF_INET6 || 522 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 523 RTFREE(ro->ro_rt); 524 ro->ro_rt = (struct rtentry *)0; 525 } 526 if (ro->ro_rt == 0) { 527 bzero(dst, sizeof(*dst)); 528 dst->sin6_family = AF_INET6; 529 dst->sin6_len = sizeof(struct sockaddr_in6); 530 dst->sin6_addr = ip6->ip6_dst; 531 #ifdef SCOPEDROUTING 532 /* XXX: sin6_scope_id should already be fixed at this point */ 533 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 534 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 535 #endif 536 } 537 #if defined(IPSEC) || defined(FAST_IPSEC) 538 if (needipsec && needipsectun) { 539 struct ipsec_output_state state; 540 541 /* 542 * All the extension headers will become inaccessible 543 * (since they can be encrypted). 544 * Don't panic, we need no more updates to extension headers 545 * on inner IPv6 packet (since they are now encapsulated). 546 * 547 * IPv6 [ESP|AH] IPv6 [extension headers] payload 548 */ 549 bzero(&exthdrs, sizeof(exthdrs)); 550 exthdrs.ip6e_ip6 = m; 551 552 bzero(&state, sizeof(state)); 553 state.m = m; 554 state.ro = (struct route *)ro; 555 state.dst = (struct sockaddr *)dst; 556 557 error = ipsec6_output_tunnel(&state, sp, flags); 558 559 m = state.m; 560 ro = (struct route_in6 *)state.ro; 561 dst = (struct sockaddr_in6 *)state.dst; 562 if (error) { 563 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 564 m0 = m = NULL; 565 m = NULL; 566 switch (error) { 567 case EHOSTUNREACH: 568 case ENETUNREACH: 569 case EMSGSIZE: 570 case ENOBUFS: 571 case ENOMEM: 572 break; 573 default: 574 printf("ip6_output (ipsec): error code %d\n", error); 575 /* fall through */ 576 case ENOENT: 577 /* don't show these error codes to the user */ 578 error = 0; 579 break; 580 } 581 goto bad; 582 } 583 584 exthdrs.ip6e_ip6 = m; 585 } 586 #endif /* IPSEC */ 587 588 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 589 /* Unicast */ 590 591 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 592 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 593 /* xxx 594 * interface selection comes here 595 * if an interface is specified from an upper layer, 596 * ifp must point it. 597 */ 598 if (ro->ro_rt == 0) { 599 /* 600 * non-bsdi always clone routes, if parent is 601 * PRF_CLONING. 602 */ 603 rtalloc((struct route *)ro); 604 } 605 if (ro->ro_rt == 0) { 606 ip6stat.ip6s_noroute++; 607 error = EHOSTUNREACH; 608 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 609 goto bad; 610 } 611 ia = ifatoia6(ro->ro_rt->rt_ifa); 612 ifp = ro->ro_rt->rt_ifp; 613 ro->ro_rt->rt_use++; 614 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 615 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 616 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 617 618 in6_ifstat_inc(ifp, ifs6_out_request); 619 620 /* 621 * Check if the outgoing interface conflicts with 622 * the interface specified by ifi6_ifindex (if specified). 623 * Note that loopback interface is always okay. 624 * (this may happen when we are sending a packet to one of 625 * our own addresses.) 626 */ 627 if (opt && opt->ip6po_pktinfo 628 && opt->ip6po_pktinfo->ipi6_ifindex) { 629 if (!(ifp->if_flags & IFF_LOOPBACK) 630 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 631 ip6stat.ip6s_noroute++; 632 in6_ifstat_inc(ifp, ifs6_out_discard); 633 error = EHOSTUNREACH; 634 goto bad; 635 } 636 } 637 638 if (opt && opt->ip6po_hlim != -1) 639 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 640 } else { 641 /* Multicast */ 642 struct in6_multi *in6m; 643 644 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 645 646 /* 647 * See if the caller provided any multicast options 648 */ 649 ifp = NULL; 650 if (im6o != NULL) { 651 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 652 if (im6o->im6o_multicast_ifp != NULL) 653 ifp = im6o->im6o_multicast_ifp; 654 } else 655 ip6->ip6_hlim = ip6_defmcasthlim; 656 657 /* 658 * See if the caller provided the outgoing interface 659 * as an ancillary data. 660 * Boundary check for ifindex is assumed to be already done. 661 */ 662 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 663 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 664 665 /* 666 * If the destination is a node-local scope multicast, 667 * the packet should be loop-backed only. 668 */ 669 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 670 /* 671 * If the outgoing interface is already specified, 672 * it should be a loopback interface. 673 */ 674 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 675 ip6stat.ip6s_badscope++; 676 error = ENETUNREACH; /* XXX: better error? */ 677 /* XXX correct ifp? */ 678 in6_ifstat_inc(ifp, ifs6_out_discard); 679 goto bad; 680 } else { 681 ifp = &loif[0]; 682 } 683 } 684 685 if (opt && opt->ip6po_hlim != -1) 686 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 687 688 /* 689 * If caller did not provide an interface lookup a 690 * default in the routing table. This is either a 691 * default for the speicfied group (i.e. a host 692 * route), or a multicast default (a route for the 693 * ``net'' ff00::/8). 694 */ 695 if (ifp == NULL) { 696 if (ro->ro_rt == 0) { 697 ro->ro_rt = rtalloc1((struct sockaddr *) 698 &ro->ro_dst, 0, 0UL); 699 } 700 if (ro->ro_rt == 0) { 701 ip6stat.ip6s_noroute++; 702 error = EHOSTUNREACH; 703 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 704 goto bad; 705 } 706 ia = ifatoia6(ro->ro_rt->rt_ifa); 707 ifp = ro->ro_rt->rt_ifp; 708 ro->ro_rt->rt_use++; 709 } 710 711 if ((flags & IPV6_FORWARDING) == 0) 712 in6_ifstat_inc(ifp, ifs6_out_request); 713 in6_ifstat_inc(ifp, ifs6_out_mcast); 714 715 /* 716 * Confirm that the outgoing interface supports multicast. 717 */ 718 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 719 ip6stat.ip6s_noroute++; 720 in6_ifstat_inc(ifp, ifs6_out_discard); 721 error = ENETUNREACH; 722 goto bad; 723 } 724 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 725 if (in6m != NULL && 726 (im6o == NULL || im6o->im6o_multicast_loop)) { 727 /* 728 * If we belong to the destination multicast group 729 * on the outgoing interface, and the caller did not 730 * forbid loopback, loop back a copy. 731 */ 732 ip6_mloopback(ifp, m, dst); 733 } else { 734 /* 735 * If we are acting as a multicast router, perform 736 * multicast forwarding as if the packet had just 737 * arrived on the interface to which we are about 738 * to send. The multicast forwarding function 739 * recursively calls this function, using the 740 * IPV6_FORWARDING flag to prevent infinite recursion. 741 * 742 * Multicasts that are looped back by ip6_mloopback(), 743 * above, will be forwarded by the ip6_input() routine, 744 * if necessary. 745 */ 746 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 747 if (ip6_mforward(ip6, ifp, m) != 0) { 748 m_freem(m); 749 goto done; 750 } 751 } 752 } 753 /* 754 * Multicasts with a hoplimit of zero may be looped back, 755 * above, but must not be transmitted on a network. 756 * Also, multicasts addressed to the loopback interface 757 * are not sent -- the above call to ip6_mloopback() will 758 * loop back a copy if this host actually belongs to the 759 * destination group on the loopback interface. 760 */ 761 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 762 m_freem(m); 763 goto done; 764 } 765 } 766 767 /* 768 * Fill the outgoing inteface to tell the upper layer 769 * to increment per-interface statistics. 770 */ 771 if (ifpp) 772 *ifpp = ifp; 773 774 /* 775 * Determine path MTU. 776 */ 777 if (ro_pmtu != ro) { 778 /* The first hop and the final destination may differ. */ 779 struct sockaddr_in6 *sin6_fin = 780 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 781 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 782 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 783 &finaldst))) { 784 RTFREE(ro_pmtu->ro_rt); 785 ro_pmtu->ro_rt = (struct rtentry *)0; 786 } 787 if (ro_pmtu->ro_rt == 0) { 788 bzero(sin6_fin, sizeof(*sin6_fin)); 789 sin6_fin->sin6_family = AF_INET6; 790 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 791 sin6_fin->sin6_addr = finaldst; 792 793 rtalloc((struct route *)ro_pmtu); 794 } 795 } 796 if (ro_pmtu->ro_rt != NULL) { 797 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 798 799 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 800 if (mtu > ifmtu || mtu == 0) { 801 /* 802 * The MTU on the route is larger than the MTU on 803 * the interface! This shouldn't happen, unless the 804 * MTU of the interface has been changed after the 805 * interface was brought up. Change the MTU in the 806 * route to match the interface MTU (as long as the 807 * field isn't locked). 808 * 809 * if MTU on the route is 0, we need to fix the MTU. 810 * this case happens with path MTU discovery timeouts. 811 */ 812 mtu = ifmtu; 813 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 814 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 815 } 816 } else { 817 mtu = nd_ifinfo[ifp->if_index].linkmtu; 818 } 819 820 /* 821 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 822 */ 823 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 824 mtu = IPV6_MMTU; 825 826 /* Fake scoped addresses */ 827 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 828 /* 829 * If source or destination address is a scoped address, and 830 * the packet is going to be sent to a loopback interface, 831 * we should keep the original interface. 832 */ 833 834 /* 835 * XXX: this is a very experimental and temporary solution. 836 * We eventually have sockaddr_in6 and use the sin6_scope_id 837 * field of the structure here. 838 * We rely on the consistency between two scope zone ids 839 * of source and destination, which should already be assured. 840 * Larger scopes than link will be supported in the future. 841 */ 842 origifp = NULL; 843 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 844 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 845 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 846 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 847 /* 848 * XXX: origifp can be NULL even in those two cases above. 849 * For example, if we remove the (only) link-local address 850 * from the loopback interface, and try to send a link-local 851 * address without link-id information. Then the source 852 * address is ::1, and the destination address is the 853 * link-local address with its s6_addr16[1] being zero. 854 * What is worse, if the packet goes to the loopback interface 855 * by a default rejected route, the null pointer would be 856 * passed to looutput, and the kernel would hang. 857 * The following last resort would prevent such disaster. 858 */ 859 if (origifp == NULL) 860 origifp = ifp; 861 } 862 else 863 origifp = ifp; 864 #ifndef SCOPEDROUTING 865 /* 866 * clear embedded scope identifiers if necessary. 867 * in6_clearscope will touch the addresses only when necessary. 868 */ 869 in6_clearscope(&ip6->ip6_src); 870 in6_clearscope(&ip6->ip6_dst); 871 #endif 872 873 /* 874 * Check with the firewall... 875 */ 876 if (ip6_fw_enable && ip6_fw_chk_ptr) { 877 u_short port = 0; 878 m->m_pkthdr.rcvif = NULL; /* XXX */ 879 /* If ipfw says divert, we have to just drop packet */ 880 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 881 m_freem(m); 882 goto done; 883 } 884 if (!m) { 885 error = EACCES; 886 goto done; 887 } 888 } 889 890 /* 891 * If the outgoing packet contains a hop-by-hop options header, 892 * it must be examined and processed even by the source node. 893 * (RFC 2460, section 4.) 894 */ 895 if (exthdrs.ip6e_hbh) { 896 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 897 u_int32_t dummy1; /* XXX unused */ 898 u_int32_t dummy2; /* XXX unused */ 899 900 #ifdef DIAGNOSTIC 901 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 902 panic("ip6e_hbh is not continuous"); 903 #endif 904 /* 905 * XXX: if we have to send an ICMPv6 error to the sender, 906 * we need the M_LOOP flag since icmp6_error() expects 907 * the IPv6 and the hop-by-hop options header are 908 * continuous unless the flag is set. 909 */ 910 m->m_flags |= M_LOOP; 911 m->m_pkthdr.rcvif = ifp; 912 if (ip6_process_hopopts(m, 913 (u_int8_t *)(hbh + 1), 914 ((hbh->ip6h_len + 1) << 3) - 915 sizeof(struct ip6_hbh), 916 &dummy1, &dummy2) < 0) { 917 /* m was already freed at this point */ 918 error = EINVAL;/* better error? */ 919 goto done; 920 } 921 m->m_flags &= ~M_LOOP; /* XXX */ 922 m->m_pkthdr.rcvif = NULL; 923 } 924 925 #ifdef PFIL_HOOKS 926 /* 927 * Run through list of hooks for output packets. 928 */ 929 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 930 if (error != 0 || m == NULL) 931 goto done; 932 ip6 = mtod(m, struct ip6_hdr *); 933 #endif /* PFIL_HOOKS */ 934 /* 935 * Send the packet to the outgoing interface. 936 * If necessary, do IPv6 fragmentation before sending. 937 */ 938 tlen = m->m_pkthdr.len; 939 if (tlen <= mtu 940 #ifdef notyet 941 /* 942 * On any link that cannot convey a 1280-octet packet in one piece, 943 * link-specific fragmentation and reassembly must be provided at 944 * a layer below IPv6. [RFC 2460, sec.5] 945 * Thus if the interface has ability of link-level fragmentation, 946 * we can just send the packet even if the packet size is 947 * larger than the link's MTU. 948 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 949 */ 950 951 || ifp->if_flags & IFF_FRAGMENTABLE 952 #endif 953 ) 954 { 955 /* Record statistics for this interface address. */ 956 if (ia && !(flags & IPV6_FORWARDING)) { 957 ia->ia_ifa.if_opackets++; 958 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 959 } 960 #ifdef IPSEC 961 /* clean ipsec history once it goes out of the node */ 962 ipsec_delaux(m); 963 #endif 964 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 965 goto done; 966 } else if (mtu < IPV6_MMTU) { 967 /* 968 * note that path MTU is never less than IPV6_MMTU 969 * (see icmp6_input). 970 */ 971 error = EMSGSIZE; 972 in6_ifstat_inc(ifp, ifs6_out_fragfail); 973 goto bad; 974 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 975 error = EMSGSIZE; 976 in6_ifstat_inc(ifp, ifs6_out_fragfail); 977 goto bad; 978 } else { 979 struct mbuf **mnext, *m_frgpart; 980 struct ip6_frag *ip6f; 981 u_int32_t id = htonl(ip6_id++); 982 u_char nextproto; 983 984 /* 985 * Too large for the destination or interface; 986 * fragment if possible. 987 * Must be able to put at least 8 bytes per fragment. 988 */ 989 hlen = unfragpartlen; 990 if (mtu > IPV6_MAXPACKET) 991 mtu = IPV6_MAXPACKET; 992 993 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 994 if (len < 8) { 995 error = EMSGSIZE; 996 in6_ifstat_inc(ifp, ifs6_out_fragfail); 997 goto bad; 998 } 999 1000 mnext = &m->m_nextpkt; 1001 1002 /* 1003 * Change the next header field of the last header in the 1004 * unfragmentable part. 1005 */ 1006 if (exthdrs.ip6e_rthdr) { 1007 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1008 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1009 } else if (exthdrs.ip6e_dest1) { 1010 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1011 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1012 } else if (exthdrs.ip6e_hbh) { 1013 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1014 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1015 } else { 1016 nextproto = ip6->ip6_nxt; 1017 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1018 } 1019 1020 /* 1021 * Loop through length of segment after first fragment, 1022 * make new header and copy data of each part and link onto 1023 * chain. 1024 */ 1025 m0 = m; 1026 for (off = hlen; off < tlen; off += len) { 1027 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1028 if (!m) { 1029 error = ENOBUFS; 1030 ip6stat.ip6s_odropped++; 1031 goto sendorfree; 1032 } 1033 m->m_pkthdr.rcvif = NULL; 1034 m->m_flags = m0->m_flags & M_COPYFLAGS; 1035 *mnext = m; 1036 mnext = &m->m_nextpkt; 1037 m->m_data += max_linkhdr; 1038 mhip6 = mtod(m, struct ip6_hdr *); 1039 *mhip6 = *ip6; 1040 m->m_len = sizeof(*mhip6); 1041 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1042 if (error) { 1043 ip6stat.ip6s_odropped++; 1044 goto sendorfree; 1045 } 1046 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1047 if (off + len >= tlen) 1048 len = tlen - off; 1049 else 1050 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1051 mhip6->ip6_plen = htons((u_short)(len + hlen + 1052 sizeof(*ip6f) - 1053 sizeof(struct ip6_hdr))); 1054 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1055 error = ENOBUFS; 1056 ip6stat.ip6s_odropped++; 1057 goto sendorfree; 1058 } 1059 m_cat(m, m_frgpart); 1060 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1061 m->m_pkthdr.rcvif = (struct ifnet *)0; 1062 ip6f->ip6f_reserved = 0; 1063 ip6f->ip6f_ident = id; 1064 ip6f->ip6f_nxt = nextproto; 1065 ip6stat.ip6s_ofragments++; 1066 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1067 } 1068 1069 in6_ifstat_inc(ifp, ifs6_out_fragok); 1070 } 1071 1072 /* 1073 * Remove leading garbages. 1074 */ 1075 sendorfree: 1076 m = m0->m_nextpkt; 1077 m0->m_nextpkt = 0; 1078 m_freem(m0); 1079 for (m0 = m; m; m = m0) { 1080 m0 = m->m_nextpkt; 1081 m->m_nextpkt = 0; 1082 if (error == 0) { 1083 /* Record statistics for this interface address. */ 1084 if (ia) { 1085 ia->ia_ifa.if_opackets++; 1086 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1087 } 1088 #ifdef IPSEC 1089 /* clean ipsec history once it goes out of the node */ 1090 ipsec_delaux(m); 1091 #endif 1092 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1093 } else 1094 m_freem(m); 1095 } 1096 1097 if (error == 0) 1098 ip6stat.ip6s_fragmented++; 1099 1100 done: 1101 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1102 RTFREE(ro->ro_rt); 1103 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1104 RTFREE(ro_pmtu->ro_rt); 1105 } 1106 1107 #ifdef IPSEC 1108 if (sp != NULL) 1109 key_freesp(sp); 1110 #endif /* IPSEC */ 1111 #ifdef FAST_IPSEC 1112 if (sp != NULL) 1113 KEY_FREESP(&sp); 1114 #endif /* FAST_IPSEC */ 1115 1116 return(error); 1117 1118 freehdrs: 1119 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1120 m_freem(exthdrs.ip6e_dest1); 1121 m_freem(exthdrs.ip6e_rthdr); 1122 m_freem(exthdrs.ip6e_dest2); 1123 /* fall through */ 1124 bad: 1125 m_freem(m); 1126 goto done; 1127 } 1128 1129 static int 1130 ip6_copyexthdr(mp, hdr, hlen) 1131 struct mbuf **mp; 1132 caddr_t hdr; 1133 int hlen; 1134 { 1135 struct mbuf *m; 1136 1137 if (hlen > MCLBYTES) 1138 return(ENOBUFS); /* XXX */ 1139 1140 MGET(m, M_DONTWAIT, MT_DATA); 1141 if (!m) 1142 return(ENOBUFS); 1143 1144 if (hlen > MLEN) { 1145 MCLGET(m, M_DONTWAIT); 1146 if ((m->m_flags & M_EXT) == 0) { 1147 m_free(m); 1148 return(ENOBUFS); 1149 } 1150 } 1151 m->m_len = hlen; 1152 if (hdr) 1153 bcopy(hdr, mtod(m, caddr_t), hlen); 1154 1155 *mp = m; 1156 return(0); 1157 } 1158 1159 /* 1160 * Insert jumbo payload option. 1161 */ 1162 static int 1163 ip6_insert_jumboopt(exthdrs, plen) 1164 struct ip6_exthdrs *exthdrs; 1165 u_int32_t plen; 1166 { 1167 struct mbuf *mopt; 1168 u_char *optbuf; 1169 u_int32_t v; 1170 1171 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1172 1173 /* 1174 * If there is no hop-by-hop options header, allocate new one. 1175 * If there is one but it doesn't have enough space to store the 1176 * jumbo payload option, allocate a cluster to store the whole options. 1177 * Otherwise, use it to store the options. 1178 */ 1179 if (exthdrs->ip6e_hbh == 0) { 1180 MGET(mopt, M_DONTWAIT, MT_DATA); 1181 if (mopt == 0) 1182 return(ENOBUFS); 1183 mopt->m_len = JUMBOOPTLEN; 1184 optbuf = mtod(mopt, u_char *); 1185 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1186 exthdrs->ip6e_hbh = mopt; 1187 } else { 1188 struct ip6_hbh *hbh; 1189 1190 mopt = exthdrs->ip6e_hbh; 1191 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1192 /* 1193 * XXX assumption: 1194 * - exthdrs->ip6e_hbh is not referenced from places 1195 * other than exthdrs. 1196 * - exthdrs->ip6e_hbh is not an mbuf chain. 1197 */ 1198 int oldoptlen = mopt->m_len; 1199 struct mbuf *n; 1200 1201 /* 1202 * XXX: give up if the whole (new) hbh header does 1203 * not fit even in an mbuf cluster. 1204 */ 1205 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1206 return(ENOBUFS); 1207 1208 /* 1209 * As a consequence, we must always prepare a cluster 1210 * at this point. 1211 */ 1212 MGET(n, M_DONTWAIT, MT_DATA); 1213 if (n) { 1214 MCLGET(n, M_DONTWAIT); 1215 if ((n->m_flags & M_EXT) == 0) { 1216 m_freem(n); 1217 n = NULL; 1218 } 1219 } 1220 if (!n) 1221 return(ENOBUFS); 1222 n->m_len = oldoptlen + JUMBOOPTLEN; 1223 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1224 oldoptlen); 1225 optbuf = mtod(n, caddr_t) + oldoptlen; 1226 m_freem(mopt); 1227 mopt = exthdrs->ip6e_hbh = n; 1228 } else { 1229 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1230 mopt->m_len += JUMBOOPTLEN; 1231 } 1232 optbuf[0] = IP6OPT_PADN; 1233 optbuf[1] = 1; 1234 1235 /* 1236 * Adjust the header length according to the pad and 1237 * the jumbo payload option. 1238 */ 1239 hbh = mtod(mopt, struct ip6_hbh *); 1240 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1241 } 1242 1243 /* fill in the option. */ 1244 optbuf[2] = IP6OPT_JUMBO; 1245 optbuf[3] = 4; 1246 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1247 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1248 1249 /* finally, adjust the packet header length */ 1250 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1251 1252 return(0); 1253 #undef JUMBOOPTLEN 1254 } 1255 1256 /* 1257 * Insert fragment header and copy unfragmentable header portions. 1258 */ 1259 static int 1260 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1261 struct mbuf *m0, *m; 1262 int hlen; 1263 struct ip6_frag **frghdrp; 1264 { 1265 struct mbuf *n, *mlast; 1266 1267 if (hlen > sizeof(struct ip6_hdr)) { 1268 n = m_copym(m0, sizeof(struct ip6_hdr), 1269 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1270 if (n == 0) 1271 return(ENOBUFS); 1272 m->m_next = n; 1273 } else 1274 n = m; 1275 1276 /* Search for the last mbuf of unfragmentable part. */ 1277 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1278 ; 1279 1280 if ((mlast->m_flags & M_EXT) == 0 && 1281 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1282 /* use the trailing space of the last mbuf for the fragment hdr */ 1283 *frghdrp = 1284 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1285 mlast->m_len += sizeof(struct ip6_frag); 1286 m->m_pkthdr.len += sizeof(struct ip6_frag); 1287 } else { 1288 /* allocate a new mbuf for the fragment header */ 1289 struct mbuf *mfrg; 1290 1291 MGET(mfrg, M_DONTWAIT, MT_DATA); 1292 if (mfrg == 0) 1293 return(ENOBUFS); 1294 mfrg->m_len = sizeof(struct ip6_frag); 1295 *frghdrp = mtod(mfrg, struct ip6_frag *); 1296 mlast->m_next = mfrg; 1297 } 1298 1299 return(0); 1300 } 1301 1302 /* 1303 * IP6 socket option processing. 1304 */ 1305 int 1306 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1307 { 1308 int privileged; 1309 struct inpcb *in6p = sotoinpcb(so); 1310 int error, optval; 1311 int level, op, optname; 1312 int optlen; 1313 struct thread *td; 1314 1315 if (sopt) { 1316 level = sopt->sopt_level; 1317 op = sopt->sopt_dir; 1318 optname = sopt->sopt_name; 1319 optlen = sopt->sopt_valsize; 1320 td = sopt->sopt_td; 1321 } else { 1322 panic("ip6_ctloutput: arg soopt is NULL"); 1323 /* NOT REACHED */ 1324 td = NULL; 1325 } 1326 error = optval = 0; 1327 1328 privileged = (td == NULL || suser(td)) ? 0 : 1; 1329 1330 if (level == IPPROTO_IPV6) { 1331 switch (op) { 1332 1333 case SOPT_SET: 1334 switch (optname) { 1335 case IPV6_PKTOPTIONS: 1336 { 1337 struct mbuf *m; 1338 1339 error = soopt_getm(sopt, &m); /* XXX */ 1340 if (error != NULL) 1341 break; 1342 error = soopt_mcopyin(sopt, m); /* XXX */ 1343 if (error != NULL) 1344 break; 1345 error = ip6_pcbopts(&in6p->in6p_outputopts, 1346 m, so, sopt); 1347 m_freem(m); /* XXX */ 1348 break; 1349 } 1350 1351 /* 1352 * Use of some Hop-by-Hop options or some 1353 * Destination options, might require special 1354 * privilege. That is, normal applications 1355 * (without special privilege) might be forbidden 1356 * from setting certain options in outgoing packets, 1357 * and might never see certain options in received 1358 * packets. [RFC 2292 Section 6] 1359 * KAME specific note: 1360 * KAME prevents non-privileged users from sending or 1361 * receiving ANY hbh/dst options in order to avoid 1362 * overhead of parsing options in the kernel. 1363 */ 1364 case IPV6_UNICAST_HOPS: 1365 case IPV6_CHECKSUM: 1366 case IPV6_FAITH: 1367 1368 case IPV6_V6ONLY: 1369 if (optlen != sizeof(int)) { 1370 error = EINVAL; 1371 break; 1372 } 1373 error = sooptcopyin(sopt, &optval, 1374 sizeof optval, sizeof optval); 1375 if (error) 1376 break; 1377 switch (optname) { 1378 1379 case IPV6_UNICAST_HOPS: 1380 if (optval < -1 || optval >= 256) 1381 error = EINVAL; 1382 else { 1383 /* -1 = kernel default */ 1384 in6p->in6p_hops = optval; 1385 1386 if ((in6p->in6p_vflag & 1387 INP_IPV4) != 0) 1388 in6p->inp_ip_ttl = optval; 1389 } 1390 break; 1391 #define OPTSET(bit) \ 1392 do { \ 1393 if (optval) \ 1394 in6p->in6p_flags |= (bit); \ 1395 else \ 1396 in6p->in6p_flags &= ~(bit); \ 1397 } while (0) 1398 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1399 1400 case IPV6_CHECKSUM: 1401 in6p->in6p_cksum = optval; 1402 break; 1403 1404 case IPV6_FAITH: 1405 OPTSET(IN6P_FAITH); 1406 break; 1407 1408 case IPV6_V6ONLY: 1409 /* 1410 * make setsockopt(IPV6_V6ONLY) 1411 * available only prior to bind(2). 1412 * see ipng mailing list, Jun 22 2001. 1413 */ 1414 if (in6p->in6p_lport || 1415 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1416 { 1417 error = EINVAL; 1418 break; 1419 } 1420 OPTSET(IN6P_IPV6_V6ONLY); 1421 if (optval) 1422 in6p->in6p_vflag &= ~INP_IPV4; 1423 else 1424 in6p->in6p_vflag |= INP_IPV4; 1425 break; 1426 } 1427 break; 1428 1429 case IPV6_PKTINFO: 1430 case IPV6_HOPLIMIT: 1431 case IPV6_HOPOPTS: 1432 case IPV6_DSTOPTS: 1433 case IPV6_RTHDR: 1434 /* RFC 2292 */ 1435 if (optlen != sizeof(int)) { 1436 error = EINVAL; 1437 break; 1438 } 1439 error = sooptcopyin(sopt, &optval, 1440 sizeof optval, sizeof optval); 1441 if (error) 1442 break; 1443 switch (optname) { 1444 case IPV6_PKTINFO: 1445 OPTSET(IN6P_PKTINFO); 1446 break; 1447 case IPV6_HOPLIMIT: 1448 OPTSET(IN6P_HOPLIMIT); 1449 break; 1450 case IPV6_HOPOPTS: 1451 /* 1452 * Check super-user privilege. 1453 * See comments for IPV6_RECVHOPOPTS. 1454 */ 1455 if (!privileged) 1456 return(EPERM); 1457 OPTSET(IN6P_HOPOPTS); 1458 break; 1459 case IPV6_DSTOPTS: 1460 if (!privileged) 1461 return(EPERM); 1462 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1463 break; 1464 case IPV6_RTHDR: 1465 OPTSET(IN6P_RTHDR); 1466 break; 1467 } 1468 break; 1469 #undef OPTSET 1470 1471 case IPV6_MULTICAST_IF: 1472 case IPV6_MULTICAST_HOPS: 1473 case IPV6_MULTICAST_LOOP: 1474 case IPV6_JOIN_GROUP: 1475 case IPV6_LEAVE_GROUP: 1476 { 1477 struct mbuf *m; 1478 if (sopt->sopt_valsize > MLEN) { 1479 error = EMSGSIZE; 1480 break; 1481 } 1482 /* XXX */ 1483 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_HEADER); 1484 if (m == 0) { 1485 error = ENOBUFS; 1486 break; 1487 } 1488 m->m_len = sopt->sopt_valsize; 1489 error = sooptcopyin(sopt, mtod(m, char *), 1490 m->m_len, m->m_len); 1491 error = ip6_setmoptions(sopt->sopt_name, 1492 &in6p->in6p_moptions, 1493 m); 1494 (void)m_free(m); 1495 } 1496 break; 1497 1498 case IPV6_PORTRANGE: 1499 error = sooptcopyin(sopt, &optval, 1500 sizeof optval, sizeof optval); 1501 if (error) 1502 break; 1503 1504 switch (optval) { 1505 case IPV6_PORTRANGE_DEFAULT: 1506 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1507 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1508 break; 1509 1510 case IPV6_PORTRANGE_HIGH: 1511 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1512 in6p->in6p_flags |= IN6P_HIGHPORT; 1513 break; 1514 1515 case IPV6_PORTRANGE_LOW: 1516 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1517 in6p->in6p_flags |= IN6P_LOWPORT; 1518 break; 1519 1520 default: 1521 error = EINVAL; 1522 break; 1523 } 1524 break; 1525 1526 #if defined(IPSEC) || defined(FAST_IPSEC) 1527 case IPV6_IPSEC_POLICY: 1528 { 1529 caddr_t req = NULL; 1530 size_t len = 0; 1531 struct mbuf *m; 1532 1533 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1534 break; 1535 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1536 break; 1537 if (m) { 1538 req = mtod(m, caddr_t); 1539 len = m->m_len; 1540 } 1541 error = ipsec6_set_policy(in6p, optname, req, 1542 len, privileged); 1543 m_freem(m); 1544 } 1545 break; 1546 #endif /* KAME IPSEC */ 1547 1548 case IPV6_FW_ADD: 1549 case IPV6_FW_DEL: 1550 case IPV6_FW_FLUSH: 1551 case IPV6_FW_ZERO: 1552 { 1553 struct mbuf *m; 1554 struct mbuf **mp = &m; 1555 1556 if (ip6_fw_ctl_ptr == NULL) 1557 return EINVAL; 1558 /* XXX */ 1559 if ((error = soopt_getm(sopt, &m)) != 0) 1560 break; 1561 /* XXX */ 1562 if ((error = soopt_mcopyin(sopt, m)) != 0) 1563 break; 1564 error = (*ip6_fw_ctl_ptr)(optname, mp); 1565 m = *mp; 1566 } 1567 break; 1568 1569 default: 1570 error = ENOPROTOOPT; 1571 break; 1572 } 1573 break; 1574 1575 case SOPT_GET: 1576 switch (optname) { 1577 1578 case IPV6_PKTOPTIONS: 1579 if (in6p->in6p_options) { 1580 struct mbuf *m; 1581 m = m_copym(in6p->in6p_options, 1582 0, M_COPYALL, M_WAIT); 1583 error = soopt_mcopyout(sopt, m); 1584 if (error == 0) 1585 m_freem(m); 1586 } else 1587 sopt->sopt_valsize = 0; 1588 break; 1589 1590 case IPV6_UNICAST_HOPS: 1591 case IPV6_CHECKSUM: 1592 1593 case IPV6_FAITH: 1594 case IPV6_V6ONLY: 1595 case IPV6_PORTRANGE: 1596 switch (optname) { 1597 1598 case IPV6_UNICAST_HOPS: 1599 optval = in6p->in6p_hops; 1600 break; 1601 1602 case IPV6_CHECKSUM: 1603 optval = in6p->in6p_cksum; 1604 break; 1605 1606 case IPV6_FAITH: 1607 optval = OPTBIT(IN6P_FAITH); 1608 break; 1609 1610 case IPV6_V6ONLY: 1611 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1612 break; 1613 1614 case IPV6_PORTRANGE: 1615 { 1616 int flags; 1617 flags = in6p->in6p_flags; 1618 if (flags & IN6P_HIGHPORT) 1619 optval = IPV6_PORTRANGE_HIGH; 1620 else if (flags & IN6P_LOWPORT) 1621 optval = IPV6_PORTRANGE_LOW; 1622 else 1623 optval = 0; 1624 break; 1625 } 1626 } 1627 error = sooptcopyout(sopt, &optval, 1628 sizeof optval); 1629 break; 1630 1631 case IPV6_PKTINFO: 1632 case IPV6_HOPLIMIT: 1633 case IPV6_HOPOPTS: 1634 case IPV6_RTHDR: 1635 case IPV6_DSTOPTS: 1636 if (optname == IPV6_HOPOPTS || 1637 optname == IPV6_DSTOPTS || 1638 !privileged) 1639 return(EPERM); 1640 switch (optname) { 1641 case IPV6_PKTINFO: 1642 optval = OPTBIT(IN6P_PKTINFO); 1643 break; 1644 case IPV6_HOPLIMIT: 1645 optval = OPTBIT(IN6P_HOPLIMIT); 1646 break; 1647 case IPV6_HOPOPTS: 1648 if (!privileged) 1649 return(EPERM); 1650 optval = OPTBIT(IN6P_HOPOPTS); 1651 break; 1652 case IPV6_RTHDR: 1653 optval = OPTBIT(IN6P_RTHDR); 1654 break; 1655 case IPV6_DSTOPTS: 1656 if (!privileged) 1657 return(EPERM); 1658 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1659 break; 1660 } 1661 error = sooptcopyout(sopt, &optval, 1662 sizeof optval); 1663 break; 1664 1665 case IPV6_MULTICAST_IF: 1666 case IPV6_MULTICAST_HOPS: 1667 case IPV6_MULTICAST_LOOP: 1668 case IPV6_JOIN_GROUP: 1669 case IPV6_LEAVE_GROUP: 1670 { 1671 struct mbuf *m; 1672 error = ip6_getmoptions(sopt->sopt_name, 1673 in6p->in6p_moptions, &m); 1674 if (error == 0) 1675 error = sooptcopyout(sopt, 1676 mtod(m, char *), m->m_len); 1677 m_freem(m); 1678 } 1679 break; 1680 1681 #if defined(IPSEC) || defined(FAST_IPSEC) 1682 case IPV6_IPSEC_POLICY: 1683 { 1684 caddr_t req = NULL; 1685 size_t len = 0; 1686 struct mbuf *m = NULL; 1687 struct mbuf **mp = &m; 1688 1689 error = soopt_getm(sopt, &m); /* XXX */ 1690 if (error != NULL) 1691 break; 1692 error = soopt_mcopyin(sopt, m); /* XXX */ 1693 if (error != NULL) 1694 break; 1695 if (m) { 1696 req = mtod(m, caddr_t); 1697 len = m->m_len; 1698 } 1699 error = ipsec6_get_policy(in6p, req, len, mp); 1700 if (error == 0) 1701 error = soopt_mcopyout(sopt, m); /*XXX*/ 1702 if (error == 0 && m) 1703 m_freem(m); 1704 break; 1705 } 1706 #endif /* KAME IPSEC */ 1707 1708 case IPV6_FW_GET: 1709 { 1710 struct mbuf *m; 1711 struct mbuf **mp = &m; 1712 1713 if (ip6_fw_ctl_ptr == NULL) 1714 { 1715 return EINVAL; 1716 } 1717 error = (*ip6_fw_ctl_ptr)(optname, mp); 1718 if (error == 0) 1719 error = soopt_mcopyout(sopt, m); /* XXX */ 1720 if (error == 0 && m) 1721 m_freem(m); 1722 } 1723 break; 1724 1725 default: 1726 error = ENOPROTOOPT; 1727 break; 1728 } 1729 break; 1730 } 1731 } else { 1732 error = EINVAL; 1733 } 1734 return(error); 1735 } 1736 1737 /* 1738 * Set up IP6 options in pcb for insertion in output packets or 1739 * specifying behavior of outgoing packets. 1740 */ 1741 static int 1742 ip6_pcbopts(pktopt, m, so, sopt) 1743 struct ip6_pktopts **pktopt; 1744 struct mbuf *m; 1745 struct socket *so; 1746 struct sockopt *sopt; 1747 { 1748 struct ip6_pktopts *opt = *pktopt; 1749 int error = 0; 1750 struct thread *td = sopt->sopt_td; 1751 int priv = 0; 1752 1753 /* turn off any old options. */ 1754 if (opt) { 1755 #ifdef DIAGNOSTIC 1756 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1757 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1758 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1759 printf("ip6_pcbopts: all specified options are cleared.\n"); 1760 #endif 1761 ip6_clearpktopts(opt, 1, -1); 1762 } else 1763 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1764 *pktopt = NULL; 1765 1766 if (!m || m->m_len == 0) { 1767 /* 1768 * Only turning off any previous options, regardless of 1769 * whether the opt is just created or given. 1770 */ 1771 free(opt, M_IP6OPT); 1772 return(0); 1773 } 1774 1775 /* set options specified by user. */ 1776 if (suser(td) == 0) 1777 priv = 1; 1778 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1779 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1780 free(opt, M_IP6OPT); 1781 return(error); 1782 } 1783 *pktopt = opt; 1784 return(0); 1785 } 1786 1787 /* 1788 * initialize ip6_pktopts. beware that there are non-zero default values in 1789 * the struct. 1790 */ 1791 void 1792 init_ip6pktopts(opt) 1793 struct ip6_pktopts *opt; 1794 { 1795 1796 bzero(opt, sizeof(*opt)); 1797 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1798 } 1799 1800 void 1801 ip6_clearpktopts(pktopt, needfree, optname) 1802 struct ip6_pktopts *pktopt; 1803 int needfree, optname; 1804 { 1805 if (pktopt == NULL) 1806 return; 1807 1808 if (optname == -1) { 1809 if (needfree && pktopt->ip6po_pktinfo) 1810 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1811 pktopt->ip6po_pktinfo = NULL; 1812 } 1813 if (optname == -1) 1814 pktopt->ip6po_hlim = -1; 1815 if (optname == -1) { 1816 if (needfree && pktopt->ip6po_nexthop) 1817 free(pktopt->ip6po_nexthop, M_IP6OPT); 1818 pktopt->ip6po_nexthop = NULL; 1819 } 1820 if (optname == -1) { 1821 if (needfree && pktopt->ip6po_hbh) 1822 free(pktopt->ip6po_hbh, M_IP6OPT); 1823 pktopt->ip6po_hbh = NULL; 1824 } 1825 if (optname == -1) { 1826 if (needfree && pktopt->ip6po_dest1) 1827 free(pktopt->ip6po_dest1, M_IP6OPT); 1828 pktopt->ip6po_dest1 = NULL; 1829 } 1830 if (optname == -1) { 1831 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1832 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1833 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1834 if (pktopt->ip6po_route.ro_rt) { 1835 RTFREE(pktopt->ip6po_route.ro_rt); 1836 pktopt->ip6po_route.ro_rt = NULL; 1837 } 1838 } 1839 if (optname == -1) { 1840 if (needfree && pktopt->ip6po_dest2) 1841 free(pktopt->ip6po_dest2, M_IP6OPT); 1842 pktopt->ip6po_dest2 = NULL; 1843 } 1844 } 1845 1846 #define PKTOPT_EXTHDRCPY(type) \ 1847 do {\ 1848 if (src->type) {\ 1849 int hlen =\ 1850 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1851 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1852 if (dst->type == NULL && canwait == M_NOWAIT)\ 1853 goto bad;\ 1854 bcopy(src->type, dst->type, hlen);\ 1855 }\ 1856 } while (0) 1857 1858 struct ip6_pktopts * 1859 ip6_copypktopts(src, canwait) 1860 struct ip6_pktopts *src; 1861 int canwait; 1862 { 1863 struct ip6_pktopts *dst; 1864 1865 if (src == NULL) { 1866 printf("ip6_clearpktopts: invalid argument\n"); 1867 return(NULL); 1868 } 1869 1870 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1871 if (dst == NULL && canwait == M_NOWAIT) 1872 return (NULL); 1873 bzero(dst, sizeof(*dst)); 1874 1875 dst->ip6po_hlim = src->ip6po_hlim; 1876 if (src->ip6po_pktinfo) { 1877 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1878 M_IP6OPT, canwait); 1879 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1880 goto bad; 1881 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1882 } 1883 if (src->ip6po_nexthop) { 1884 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1885 M_IP6OPT, canwait); 1886 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1887 goto bad; 1888 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1889 src->ip6po_nexthop->sa_len); 1890 } 1891 PKTOPT_EXTHDRCPY(ip6po_hbh); 1892 PKTOPT_EXTHDRCPY(ip6po_dest1); 1893 PKTOPT_EXTHDRCPY(ip6po_dest2); 1894 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1895 return(dst); 1896 1897 bad: 1898 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1899 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1900 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1901 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1902 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1903 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1904 free(dst, M_IP6OPT); 1905 return(NULL); 1906 } 1907 #undef PKTOPT_EXTHDRCPY 1908 1909 void 1910 ip6_freepcbopts(pktopt) 1911 struct ip6_pktopts *pktopt; 1912 { 1913 if (pktopt == NULL) 1914 return; 1915 1916 ip6_clearpktopts(pktopt, 1, -1); 1917 1918 free(pktopt, M_IP6OPT); 1919 } 1920 1921 /* 1922 * Set the IP6 multicast options in response to user setsockopt(). 1923 */ 1924 static int 1925 ip6_setmoptions(optname, im6op, m) 1926 int optname; 1927 struct ip6_moptions **im6op; 1928 struct mbuf *m; 1929 { 1930 int error = 0; 1931 u_int loop, ifindex; 1932 struct ipv6_mreq *mreq; 1933 struct ifnet *ifp; 1934 struct ip6_moptions *im6o = *im6op; 1935 struct route_in6 ro; 1936 struct sockaddr_in6 *dst; 1937 struct in6_multi_mship *imm; 1938 struct thread *td = curthread; /* XXX */ 1939 1940 if (im6o == NULL) { 1941 /* 1942 * No multicast option buffer attached to the pcb; 1943 * allocate one and initialize to default values. 1944 */ 1945 im6o = (struct ip6_moptions *) 1946 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1947 1948 if (im6o == NULL) 1949 return(ENOBUFS); 1950 *im6op = im6o; 1951 im6o->im6o_multicast_ifp = NULL; 1952 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1953 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1954 LIST_INIT(&im6o->im6o_memberships); 1955 } 1956 1957 switch (optname) { 1958 1959 case IPV6_MULTICAST_IF: 1960 /* 1961 * Select the interface for outgoing multicast packets. 1962 */ 1963 if (m == NULL || m->m_len != sizeof(u_int)) { 1964 error = EINVAL; 1965 break; 1966 } 1967 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1968 if (ifindex < 0 || if_index < ifindex) { 1969 error = ENXIO; /* XXX EINVAL? */ 1970 break; 1971 } 1972 ifp = ifindex2ifnet[ifindex]; 1973 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1974 error = EADDRNOTAVAIL; 1975 break; 1976 } 1977 im6o->im6o_multicast_ifp = ifp; 1978 break; 1979 1980 case IPV6_MULTICAST_HOPS: 1981 { 1982 /* 1983 * Set the IP6 hoplimit for outgoing multicast packets. 1984 */ 1985 int optval; 1986 if (m == NULL || m->m_len != sizeof(int)) { 1987 error = EINVAL; 1988 break; 1989 } 1990 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1991 if (optval < -1 || optval >= 256) 1992 error = EINVAL; 1993 else if (optval == -1) 1994 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1995 else 1996 im6o->im6o_multicast_hlim = optval; 1997 break; 1998 } 1999 2000 case IPV6_MULTICAST_LOOP: 2001 /* 2002 * Set the loopback flag for outgoing multicast packets. 2003 * Must be zero or one. 2004 */ 2005 if (m == NULL || m->m_len != sizeof(u_int)) { 2006 error = EINVAL; 2007 break; 2008 } 2009 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2010 if (loop > 1) { 2011 error = EINVAL; 2012 break; 2013 } 2014 im6o->im6o_multicast_loop = loop; 2015 break; 2016 2017 case IPV6_JOIN_GROUP: 2018 /* 2019 * Add a multicast group membership. 2020 * Group must be a valid IP6 multicast address. 2021 */ 2022 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2023 error = EINVAL; 2024 break; 2025 } 2026 mreq = mtod(m, struct ipv6_mreq *); 2027 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2028 /* 2029 * We use the unspecified address to specify to accept 2030 * all multicast addresses. Only super user is allowed 2031 * to do this. 2032 */ 2033 if (suser(td)) 2034 { 2035 error = EACCES; 2036 break; 2037 } 2038 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2039 error = EINVAL; 2040 break; 2041 } 2042 2043 /* 2044 * If the interface is specified, validate it. 2045 */ 2046 if (mreq->ipv6mr_interface < 0 2047 || if_index < mreq->ipv6mr_interface) { 2048 error = ENXIO; /* XXX EINVAL? */ 2049 break; 2050 } 2051 /* 2052 * If no interface was explicitly specified, choose an 2053 * appropriate one according to the given multicast address. 2054 */ 2055 if (mreq->ipv6mr_interface == 0) { 2056 /* 2057 * If the multicast address is in node-local scope, 2058 * the interface should be a loopback interface. 2059 * Otherwise, look up the routing table for the 2060 * address, and choose the outgoing interface. 2061 * XXX: is it a good approach? 2062 */ 2063 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2064 ifp = &loif[0]; 2065 } else { 2066 ro.ro_rt = NULL; 2067 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2068 bzero(dst, sizeof(*dst)); 2069 dst->sin6_len = sizeof(struct sockaddr_in6); 2070 dst->sin6_family = AF_INET6; 2071 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2072 rtalloc((struct route *)&ro); 2073 if (ro.ro_rt == NULL) { 2074 error = EADDRNOTAVAIL; 2075 break; 2076 } 2077 ifp = ro.ro_rt->rt_ifp; 2078 rtfree(ro.ro_rt); 2079 } 2080 } else 2081 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2082 2083 /* 2084 * See if we found an interface, and confirm that it 2085 * supports multicast 2086 */ 2087 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2088 error = EADDRNOTAVAIL; 2089 break; 2090 } 2091 /* 2092 * Put interface index into the multicast address, 2093 * if the address has link-local scope. 2094 */ 2095 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2096 mreq->ipv6mr_multiaddr.s6_addr16[1] 2097 = htons(mreq->ipv6mr_interface); 2098 } 2099 /* 2100 * See if the membership already exists. 2101 */ 2102 for (imm = im6o->im6o_memberships.lh_first; 2103 imm != NULL; imm = imm->i6mm_chain.le_next) 2104 if (imm->i6mm_maddr->in6m_ifp == ifp && 2105 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2106 &mreq->ipv6mr_multiaddr)) 2107 break; 2108 if (imm != NULL) { 2109 error = EADDRINUSE; 2110 break; 2111 } 2112 /* 2113 * Everything looks good; add a new record to the multicast 2114 * address list for the given interface. 2115 */ 2116 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2117 if (imm == NULL) { 2118 error = ENOBUFS; 2119 break; 2120 } 2121 if ((imm->i6mm_maddr = 2122 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2123 free(imm, M_IPMADDR); 2124 break; 2125 } 2126 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2127 break; 2128 2129 case IPV6_LEAVE_GROUP: 2130 /* 2131 * Drop a multicast group membership. 2132 * Group must be a valid IP6 multicast address. 2133 */ 2134 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2135 error = EINVAL; 2136 break; 2137 } 2138 mreq = mtod(m, struct ipv6_mreq *); 2139 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2140 if (suser(td)) { 2141 error = EACCES; 2142 break; 2143 } 2144 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2145 error = EINVAL; 2146 break; 2147 } 2148 /* 2149 * If an interface address was specified, get a pointer 2150 * to its ifnet structure. 2151 */ 2152 if (mreq->ipv6mr_interface < 0 2153 || if_index < mreq->ipv6mr_interface) { 2154 error = ENXIO; /* XXX EINVAL? */ 2155 break; 2156 } 2157 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2158 /* 2159 * Put interface index into the multicast address, 2160 * if the address has link-local scope. 2161 */ 2162 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2163 mreq->ipv6mr_multiaddr.s6_addr16[1] 2164 = htons(mreq->ipv6mr_interface); 2165 } 2166 /* 2167 * Find the membership in the membership list. 2168 */ 2169 for (imm = im6o->im6o_memberships.lh_first; 2170 imm != NULL; imm = imm->i6mm_chain.le_next) { 2171 if ((ifp == NULL || 2172 imm->i6mm_maddr->in6m_ifp == ifp) && 2173 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2174 &mreq->ipv6mr_multiaddr)) 2175 break; 2176 } 2177 if (imm == NULL) { 2178 /* Unable to resolve interface */ 2179 error = EADDRNOTAVAIL; 2180 break; 2181 } 2182 /* 2183 * Give up the multicast address record to which the 2184 * membership points. 2185 */ 2186 LIST_REMOVE(imm, i6mm_chain); 2187 in6_delmulti(imm->i6mm_maddr); 2188 free(imm, M_IPMADDR); 2189 break; 2190 2191 default: 2192 error = EOPNOTSUPP; 2193 break; 2194 } 2195 2196 /* 2197 * If all options have default values, no need to keep the mbuf. 2198 */ 2199 if (im6o->im6o_multicast_ifp == NULL && 2200 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2201 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2202 im6o->im6o_memberships.lh_first == NULL) { 2203 free(*im6op, M_IPMOPTS); 2204 *im6op = NULL; 2205 } 2206 2207 return(error); 2208 } 2209 2210 /* 2211 * Return the IP6 multicast options in response to user getsockopt(). 2212 */ 2213 static int 2214 ip6_getmoptions(optname, im6o, mp) 2215 int optname; 2216 struct ip6_moptions *im6o; 2217 struct mbuf **mp; 2218 { 2219 u_int *hlim, *loop, *ifindex; 2220 2221 *mp = m_get(M_WAIT, MT_HEADER); /* XXX */ 2222 2223 switch (optname) { 2224 2225 case IPV6_MULTICAST_IF: 2226 ifindex = mtod(*mp, u_int *); 2227 (*mp)->m_len = sizeof(u_int); 2228 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2229 *ifindex = 0; 2230 else 2231 *ifindex = im6o->im6o_multicast_ifp->if_index; 2232 return(0); 2233 2234 case IPV6_MULTICAST_HOPS: 2235 hlim = mtod(*mp, u_int *); 2236 (*mp)->m_len = sizeof(u_int); 2237 if (im6o == NULL) 2238 *hlim = ip6_defmcasthlim; 2239 else 2240 *hlim = im6o->im6o_multicast_hlim; 2241 return(0); 2242 2243 case IPV6_MULTICAST_LOOP: 2244 loop = mtod(*mp, u_int *); 2245 (*mp)->m_len = sizeof(u_int); 2246 if (im6o == NULL) 2247 *loop = ip6_defmcasthlim; 2248 else 2249 *loop = im6o->im6o_multicast_loop; 2250 return(0); 2251 2252 default: 2253 return(EOPNOTSUPP); 2254 } 2255 } 2256 2257 /* 2258 * Discard the IP6 multicast options. 2259 */ 2260 void 2261 ip6_freemoptions(im6o) 2262 struct ip6_moptions *im6o; 2263 { 2264 struct in6_multi_mship *imm; 2265 2266 if (im6o == NULL) 2267 return; 2268 2269 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2270 LIST_REMOVE(imm, i6mm_chain); 2271 if (imm->i6mm_maddr) 2272 in6_delmulti(imm->i6mm_maddr); 2273 free(imm, M_IPMADDR); 2274 } 2275 free(im6o, M_IPMOPTS); 2276 } 2277 2278 /* 2279 * Set IPv6 outgoing packet options based on advanced API. 2280 */ 2281 int 2282 ip6_setpktoptions(control, opt, priv, needcopy) 2283 struct mbuf *control; 2284 struct ip6_pktopts *opt; 2285 int priv, needcopy; 2286 { 2287 struct cmsghdr *cm = 0; 2288 2289 if (control == 0 || opt == 0) 2290 return(EINVAL); 2291 2292 init_ip6pktopts(opt); 2293 2294 /* 2295 * XXX: Currently, we assume all the optional information is stored 2296 * in a single mbuf. 2297 */ 2298 if (control->m_next) 2299 return(EINVAL); 2300 2301 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2302 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2303 cm = mtod(control, struct cmsghdr *); 2304 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2305 return(EINVAL); 2306 if (cm->cmsg_level != IPPROTO_IPV6) 2307 continue; 2308 2309 /* 2310 * XXX should check if RFC2292 API is mixed with 2292bis API 2311 */ 2312 switch (cm->cmsg_type) { 2313 case IPV6_PKTINFO: 2314 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2315 return(EINVAL); 2316 if (needcopy) { 2317 /* XXX: Is it really WAITOK? */ 2318 opt->ip6po_pktinfo = 2319 malloc(sizeof(struct in6_pktinfo), 2320 M_IP6OPT, M_WAITOK); 2321 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2322 sizeof(struct in6_pktinfo)); 2323 } else 2324 opt->ip6po_pktinfo = 2325 (struct in6_pktinfo *)CMSG_DATA(cm); 2326 if (opt->ip6po_pktinfo->ipi6_ifindex && 2327 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2328 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2329 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2330 2331 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2332 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2333 return(ENXIO); 2334 } 2335 2336 /* 2337 * Check if the requested source address is indeed a 2338 * unicast address assigned to the node, and can be 2339 * used as the packet's source address. 2340 */ 2341 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2342 struct in6_ifaddr *ia6; 2343 struct sockaddr_in6 sin6; 2344 2345 bzero(&sin6, sizeof(sin6)); 2346 sin6.sin6_len = sizeof(sin6); 2347 sin6.sin6_family = AF_INET6; 2348 sin6.sin6_addr = 2349 opt->ip6po_pktinfo->ipi6_addr; 2350 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2351 if (ia6 == NULL || 2352 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2353 IN6_IFF_NOTREADY)) != 0) 2354 return(EADDRNOTAVAIL); 2355 } 2356 break; 2357 2358 case IPV6_HOPLIMIT: 2359 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2360 return(EINVAL); 2361 2362 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2363 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2364 return(EINVAL); 2365 break; 2366 2367 case IPV6_NEXTHOP: 2368 if (!priv) 2369 return(EPERM); 2370 2371 if (cm->cmsg_len < sizeof(u_char) || 2372 /* check if cmsg_len is large enough for sa_len */ 2373 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2374 return(EINVAL); 2375 2376 if (needcopy) { 2377 opt->ip6po_nexthop = 2378 malloc(*CMSG_DATA(cm), 2379 M_IP6OPT, M_WAITOK); 2380 bcopy(CMSG_DATA(cm), 2381 opt->ip6po_nexthop, 2382 *CMSG_DATA(cm)); 2383 } else 2384 opt->ip6po_nexthop = 2385 (struct sockaddr *)CMSG_DATA(cm); 2386 break; 2387 2388 case IPV6_HOPOPTS: 2389 { 2390 struct ip6_hbh *hbh; 2391 int hbhlen; 2392 2393 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2394 return(EINVAL); 2395 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2396 hbhlen = (hbh->ip6h_len + 1) << 3; 2397 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2398 return(EINVAL); 2399 2400 if (needcopy) { 2401 opt->ip6po_hbh = 2402 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2403 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2404 } else 2405 opt->ip6po_hbh = hbh; 2406 break; 2407 } 2408 2409 case IPV6_DSTOPTS: 2410 { 2411 struct ip6_dest *dest, **newdest; 2412 int destlen; 2413 2414 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2415 return(EINVAL); 2416 dest = (struct ip6_dest *)CMSG_DATA(cm); 2417 destlen = (dest->ip6d_len + 1) << 3; 2418 if (cm->cmsg_len != CMSG_LEN(destlen)) 2419 return(EINVAL); 2420 2421 /* 2422 * The old advacned API is ambiguous on this 2423 * point. Our approach is to determine the 2424 * position based according to the existence 2425 * of a routing header. Note, however, that 2426 * this depends on the order of the extension 2427 * headers in the ancillary data; the 1st part 2428 * of the destination options header must 2429 * appear before the routing header in the 2430 * ancillary data, too. 2431 * RFC2292bis solved the ambiguity by 2432 * introducing separate cmsg types. 2433 */ 2434 if (opt->ip6po_rthdr == NULL) 2435 newdest = &opt->ip6po_dest1; 2436 else 2437 newdest = &opt->ip6po_dest2; 2438 2439 if (needcopy) { 2440 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2441 bcopy(dest, *newdest, destlen); 2442 } else 2443 *newdest = dest; 2444 2445 break; 2446 } 2447 2448 case IPV6_RTHDR: 2449 { 2450 struct ip6_rthdr *rth; 2451 int rthlen; 2452 2453 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2454 return(EINVAL); 2455 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2456 rthlen = (rth->ip6r_len + 1) << 3; 2457 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2458 return(EINVAL); 2459 2460 switch (rth->ip6r_type) { 2461 case IPV6_RTHDR_TYPE_0: 2462 /* must contain one addr */ 2463 if (rth->ip6r_len == 0) 2464 return(EINVAL); 2465 /* length must be even */ 2466 if (rth->ip6r_len % 2) 2467 return(EINVAL); 2468 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2469 return(EINVAL); 2470 break; 2471 default: 2472 return(EINVAL); /* not supported */ 2473 } 2474 2475 if (needcopy) { 2476 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2477 M_WAITOK); 2478 bcopy(rth, opt->ip6po_rthdr, rthlen); 2479 } else 2480 opt->ip6po_rthdr = rth; 2481 2482 break; 2483 } 2484 2485 default: 2486 return(ENOPROTOOPT); 2487 } 2488 } 2489 2490 return(0); 2491 } 2492 2493 /* 2494 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2495 * packet to the input queue of a specified interface. Note that this 2496 * calls the output routine of the loopback "driver", but with an interface 2497 * pointer that might NOT be &loif -- easier than replicating that code here. 2498 */ 2499 void 2500 ip6_mloopback(ifp, m, dst) 2501 struct ifnet *ifp; 2502 struct mbuf *m; 2503 struct sockaddr_in6 *dst; 2504 { 2505 struct mbuf *copym; 2506 struct ip6_hdr *ip6; 2507 2508 copym = m_copy(m, 0, M_COPYALL); 2509 if (copym == NULL) 2510 return; 2511 2512 /* 2513 * Make sure to deep-copy IPv6 header portion in case the data 2514 * is in an mbuf cluster, so that we can safely override the IPv6 2515 * header portion later. 2516 */ 2517 if ((copym->m_flags & M_EXT) != 0 || 2518 copym->m_len < sizeof(struct ip6_hdr)) { 2519 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2520 if (copym == NULL) 2521 return; 2522 } 2523 2524 #ifdef DIAGNOSTIC 2525 if (copym->m_len < sizeof(*ip6)) { 2526 m_freem(copym); 2527 return; 2528 } 2529 #endif 2530 2531 ip6 = mtod(copym, struct ip6_hdr *); 2532 #ifndef SCOPEDROUTING 2533 /* 2534 * clear embedded scope identifiers if necessary. 2535 * in6_clearscope will touch the addresses only when necessary. 2536 */ 2537 in6_clearscope(&ip6->ip6_src); 2538 in6_clearscope(&ip6->ip6_dst); 2539 #endif 2540 2541 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2542 } 2543 2544 /* 2545 * Chop IPv6 header off from the payload. 2546 */ 2547 static int 2548 ip6_splithdr(m, exthdrs) 2549 struct mbuf *m; 2550 struct ip6_exthdrs *exthdrs; 2551 { 2552 struct mbuf *mh; 2553 struct ip6_hdr *ip6; 2554 2555 ip6 = mtod(m, struct ip6_hdr *); 2556 if (m->m_len > sizeof(*ip6)) { 2557 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2558 if (mh == 0) { 2559 m_freem(m); 2560 return ENOBUFS; 2561 } 2562 M_MOVE_PKTHDR(mh, m); 2563 MH_ALIGN(mh, sizeof(*ip6)); 2564 m->m_len -= sizeof(*ip6); 2565 m->m_data += sizeof(*ip6); 2566 mh->m_next = m; 2567 m = mh; 2568 m->m_len = sizeof(*ip6); 2569 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2570 } 2571 exthdrs->ip6e_ip6 = m; 2572 return 0; 2573 } 2574 2575 /* 2576 * Compute IPv6 extension header length. 2577 */ 2578 int 2579 ip6_optlen(in6p) 2580 struct in6pcb *in6p; 2581 { 2582 int len; 2583 2584 if (!in6p->in6p_outputopts) 2585 return 0; 2586 2587 len = 0; 2588 #define elen(x) \ 2589 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2590 2591 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2592 if (in6p->in6p_outputopts->ip6po_rthdr) 2593 /* dest1 is valid with rthdr only */ 2594 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2595 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2596 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2597 return len; 2598 #undef elen 2599 } 2600