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 1.8 2003/08/23 11:02:45 rob 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 74 #include <sys/param.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/errno.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet6/in6_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet6/nd6.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #ifdef INET6 100 #include <netinet6/ipsec6.h> 101 #endif 102 #include <netproto/key/key.h> 103 #endif /* IPSEC */ 104 105 #ifdef FAST_IPSEC 106 #include "ipsec.h" 107 #include "ipsec6.h" 108 #include <netipsec/key.h> 109 #endif /* FAST_IPSEC */ 110 111 #include <net/ip6fw/ip6_fw.h> 112 113 #include <net/net_osdep.h> 114 115 struct ip; 116 extern int (*fr_checkp) (struct ip *, int, struct ifnet *, int, struct mbuf **); 117 118 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 119 120 struct ip6_exthdrs { 121 struct mbuf *ip6e_ip6; 122 struct mbuf *ip6e_hbh; 123 struct mbuf *ip6e_dest1; 124 struct mbuf *ip6e_rthdr; 125 struct mbuf *ip6e_dest2; 126 }; 127 128 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 129 struct socket *, struct sockopt *sopt); 130 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 131 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 132 static int ip6_copyexthdr (struct mbuf **, caddr_t, int); 133 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 134 struct ip6_frag **); 135 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 136 static int ip6_splithdr (struct mbuf *, struct ip6_exthdrs *); 137 138 /* 139 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 140 * header (with pri, len, nxt, hlim, src, dst). 141 * This function may modify ver and hlim only. 142 * The mbuf chain containing the packet will be freed. 143 * The mbuf opt, if present, will not be freed. 144 * 145 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 146 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 147 * which is rt_rmx.rmx_mtu. 148 */ 149 int 150 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 151 struct mbuf *m0; 152 struct ip6_pktopts *opt; 153 struct route_in6 *ro; 154 int flags; 155 struct ip6_moptions *im6o; 156 struct ifnet **ifpp; /* XXX: just for statistics */ 157 struct inpcb *inp; 158 { 159 struct ip6_hdr *ip6, *mhip6; 160 struct ifnet *ifp, *origifp; 161 struct mbuf *m = m0; 162 int hlen, tlen, len, off; 163 struct route_in6 ip6route; 164 struct sockaddr_in6 *dst; 165 int error = 0; 166 struct in6_ifaddr *ia = NULL; 167 u_long mtu; 168 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 169 struct ip6_exthdrs exthdrs; 170 struct in6_addr finaldst; 171 struct route_in6 *ro_pmtu = NULL; 172 int hdrsplit = 0; 173 int needipsec = 0; 174 #ifdef IPSEC 175 int needipsectun = 0; 176 struct secpolicy *sp = NULL; 177 struct socket *so = inp ? inp->inp_socket : NULL; 178 179 ip6 = mtod(m, struct ip6_hdr *); 180 #endif /* IPSEC */ 181 #ifdef FAST_IPSEC 182 int needipsectun = 0; 183 struct secpolicy *sp = NULL; 184 185 ip6 = mtod(m, struct ip6_hdr *); 186 #endif /* FAST_IPSEC */ 187 188 #define MAKE_EXTHDR(hp, mp) \ 189 do { \ 190 if (hp) { \ 191 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 192 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 193 ((eh)->ip6e_len + 1) << 3); \ 194 if (error) \ 195 goto freehdrs; \ 196 } \ 197 } while (0) 198 199 bzero(&exthdrs, sizeof(exthdrs)); 200 201 if (opt) { 202 /* Hop-by-Hop options header */ 203 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 204 /* Destination options header(1st part) */ 205 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 206 /* Routing header */ 207 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 208 /* Destination options header(2nd part) */ 209 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 210 } 211 212 #ifdef IPSEC 213 /* get a security policy for this packet */ 214 if (so == NULL) 215 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 216 else 217 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 218 219 if (sp == NULL) { 220 ipsec6stat.out_inval++; 221 goto freehdrs; 222 } 223 224 error = 0; 225 226 /* check policy */ 227 switch (sp->policy) { 228 case IPSEC_POLICY_DISCARD: 229 /* 230 * This packet is just discarded. 231 */ 232 ipsec6stat.out_polvio++; 233 goto freehdrs; 234 235 case IPSEC_POLICY_BYPASS: 236 case IPSEC_POLICY_NONE: 237 /* no need to do IPsec. */ 238 needipsec = 0; 239 break; 240 241 case IPSEC_POLICY_IPSEC: 242 if (sp->req == NULL) { 243 /* acquire a policy */ 244 error = key_spdacquire(sp); 245 goto freehdrs; 246 } 247 needipsec = 1; 248 break; 249 250 case IPSEC_POLICY_ENTRUST: 251 default: 252 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 253 } 254 #endif /* IPSEC */ 255 #ifdef FAST_IPSEC 256 /* get a security policy for this packet */ 257 if (inp == NULL) 258 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 259 else 260 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 261 262 if (sp == NULL) { 263 newipsecstat.ips_out_inval++; 264 goto freehdrs; 265 } 266 267 error = 0; 268 269 /* check policy */ 270 switch (sp->policy) { 271 case IPSEC_POLICY_DISCARD: 272 /* 273 * This packet is just discarded. 274 */ 275 newipsecstat.ips_out_polvio++; 276 goto freehdrs; 277 278 case IPSEC_POLICY_BYPASS: 279 case IPSEC_POLICY_NONE: 280 /* no need to do IPsec. */ 281 needipsec = 0; 282 break; 283 284 case IPSEC_POLICY_IPSEC: 285 if (sp->req == NULL) { 286 /* acquire a policy */ 287 error = key_spdacquire(sp); 288 goto freehdrs; 289 } 290 needipsec = 1; 291 break; 292 293 case IPSEC_POLICY_ENTRUST: 294 default: 295 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 296 } 297 #endif /* FAST_IPSEC */ 298 299 /* 300 * Calculate the total length of the extension header chain. 301 * Keep the length of the unfragmentable part for fragmentation. 302 */ 303 optlen = 0; 304 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 305 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 306 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 307 unfragpartlen = optlen + sizeof(struct ip6_hdr); 308 /* NOTE: we don't add AH/ESP length here. do that later. */ 309 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 310 311 /* 312 * If we need IPsec, or there is at least one extension header, 313 * separate IP6 header from the payload. 314 */ 315 if ((needipsec || optlen) && !hdrsplit) { 316 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 317 m = NULL; 318 goto freehdrs; 319 } 320 m = exthdrs.ip6e_ip6; 321 hdrsplit++; 322 } 323 324 /* adjust pointer */ 325 ip6 = mtod(m, struct ip6_hdr *); 326 327 /* adjust mbuf packet header length */ 328 m->m_pkthdr.len += optlen; 329 plen = m->m_pkthdr.len - sizeof(*ip6); 330 331 /* If this is a jumbo payload, insert a jumbo payload option. */ 332 if (plen > IPV6_MAXPACKET) { 333 if (!hdrsplit) { 334 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 335 m = NULL; 336 goto freehdrs; 337 } 338 m = exthdrs.ip6e_ip6; 339 hdrsplit++; 340 } 341 /* adjust pointer */ 342 ip6 = mtod(m, struct ip6_hdr *); 343 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 344 goto freehdrs; 345 ip6->ip6_plen = 0; 346 } else 347 ip6->ip6_plen = htons(plen); 348 349 /* 350 * Concatenate headers and fill in next header fields. 351 * Here we have, on "m" 352 * IPv6 payload 353 * and we insert headers accordingly. Finally, we should be getting: 354 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 355 * 356 * during the header composing process, "m" points to IPv6 header. 357 * "mprev" points to an extension header prior to esp. 358 */ 359 { 360 u_char *nexthdrp = &ip6->ip6_nxt; 361 struct mbuf *mprev = m; 362 363 /* 364 * we treat dest2 specially. this makes IPsec processing 365 * much easier. the goal here is to make mprev point the 366 * mbuf prior to dest2. 367 * 368 * result: IPv6 dest2 payload 369 * m and mprev will point to IPv6 header. 370 */ 371 if (exthdrs.ip6e_dest2) { 372 if (!hdrsplit) 373 panic("assumption failed: hdr not split"); 374 exthdrs.ip6e_dest2->m_next = m->m_next; 375 m->m_next = exthdrs.ip6e_dest2; 376 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 377 ip6->ip6_nxt = IPPROTO_DSTOPTS; 378 } 379 380 #define MAKE_CHAIN(m, mp, p, i)\ 381 do {\ 382 if (m) {\ 383 if (!hdrsplit) \ 384 panic("assumption failed: hdr not split"); \ 385 *mtod((m), u_char *) = *(p);\ 386 *(p) = (i);\ 387 p = mtod((m), u_char *);\ 388 (m)->m_next = (mp)->m_next;\ 389 (mp)->m_next = (m);\ 390 (mp) = (m);\ 391 }\ 392 } while (0) 393 /* 394 * result: IPv6 hbh dest1 rthdr dest2 payload 395 * m will point to IPv6 header. mprev will point to the 396 * extension header prior to dest2 (rthdr in the above case). 397 */ 398 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 399 nexthdrp, IPPROTO_HOPOPTS); 400 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 401 nexthdrp, IPPROTO_DSTOPTS); 402 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 403 nexthdrp, IPPROTO_ROUTING); 404 405 #if defined(IPSEC) || defined(FAST_IPSEC) 406 if (!needipsec) 407 goto skip_ipsec2; 408 409 /* 410 * pointers after IPsec headers are not valid any more. 411 * other pointers need a great care too. 412 * (IPsec routines should not mangle mbufs prior to AH/ESP) 413 */ 414 exthdrs.ip6e_dest2 = NULL; 415 416 { 417 struct ip6_rthdr *rh = NULL; 418 int segleft_org = 0; 419 struct ipsec_output_state state; 420 421 if (exthdrs.ip6e_rthdr) { 422 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 423 segleft_org = rh->ip6r_segleft; 424 rh->ip6r_segleft = 0; 425 } 426 427 bzero(&state, sizeof(state)); 428 state.m = m; 429 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 430 &needipsectun); 431 m = state.m; 432 if (error) { 433 /* mbuf is already reclaimed in ipsec6_output_trans. */ 434 m = NULL; 435 switch (error) { 436 case EHOSTUNREACH: 437 case ENETUNREACH: 438 case EMSGSIZE: 439 case ENOBUFS: 440 case ENOMEM: 441 break; 442 default: 443 printf("ip6_output (ipsec): error code %d\n", error); 444 /* fall through */ 445 case ENOENT: 446 /* don't show these error codes to the user */ 447 error = 0; 448 break; 449 } 450 goto bad; 451 } 452 if (exthdrs.ip6e_rthdr) { 453 /* ah6_output doesn't modify mbuf chain */ 454 rh->ip6r_segleft = segleft_org; 455 } 456 } 457 skip_ipsec2:; 458 #endif 459 } 460 461 /* 462 * If there is a routing header, replace destination address field 463 * with the first hop of the routing header. 464 */ 465 if (exthdrs.ip6e_rthdr) { 466 struct ip6_rthdr *rh = 467 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 468 struct ip6_rthdr *)); 469 struct ip6_rthdr0 *rh0; 470 471 finaldst = ip6->ip6_dst; 472 switch (rh->ip6r_type) { 473 case IPV6_RTHDR_TYPE_0: 474 rh0 = (struct ip6_rthdr0 *)rh; 475 ip6->ip6_dst = rh0->ip6r0_addr[0]; 476 bcopy((caddr_t)&rh0->ip6r0_addr[1], 477 (caddr_t)&rh0->ip6r0_addr[0], 478 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 479 ); 480 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 481 break; 482 default: /* is it possible? */ 483 error = EINVAL; 484 goto bad; 485 } 486 } 487 488 /* Source address validation */ 489 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 490 (flags & IPV6_DADOUTPUT) == 0) { 491 error = EOPNOTSUPP; 492 ip6stat.ip6s_badscope++; 493 goto bad; 494 } 495 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 496 error = EOPNOTSUPP; 497 ip6stat.ip6s_badscope++; 498 goto bad; 499 } 500 501 ip6stat.ip6s_localout++; 502 503 /* 504 * Route packet. 505 */ 506 if (ro == 0) { 507 ro = &ip6route; 508 bzero((caddr_t)ro, sizeof(*ro)); 509 } 510 ro_pmtu = ro; 511 if (opt && opt->ip6po_rthdr) 512 ro = &opt->ip6po_route; 513 dst = (struct sockaddr_in6 *)&ro->ro_dst; 514 /* 515 * If there is a cached route, 516 * check that it is to the same destination 517 * and is still up. If not, free it and try again. 518 */ 519 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 520 dst->sin6_family != AF_INET6 || 521 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 522 RTFREE(ro->ro_rt); 523 ro->ro_rt = (struct rtentry *)0; 524 } 525 if (ro->ro_rt == 0) { 526 bzero(dst, sizeof(*dst)); 527 dst->sin6_family = AF_INET6; 528 dst->sin6_len = sizeof(struct sockaddr_in6); 529 dst->sin6_addr = ip6->ip6_dst; 530 #ifdef SCOPEDROUTING 531 /* XXX: sin6_scope_id should already be fixed at this point */ 532 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 533 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 534 #endif 535 } 536 #if defined(IPSEC) || defined(FAST_IPSEC) 537 if (needipsec && needipsectun) { 538 struct ipsec_output_state state; 539 540 /* 541 * All the extension headers will become inaccessible 542 * (since they can be encrypted). 543 * Don't panic, we need no more updates to extension headers 544 * on inner IPv6 packet (since they are now encapsulated). 545 * 546 * IPv6 [ESP|AH] IPv6 [extension headers] payload 547 */ 548 bzero(&exthdrs, sizeof(exthdrs)); 549 exthdrs.ip6e_ip6 = m; 550 551 bzero(&state, sizeof(state)); 552 state.m = m; 553 state.ro = (struct route *)ro; 554 state.dst = (struct sockaddr *)dst; 555 556 error = ipsec6_output_tunnel(&state, sp, flags); 557 558 m = state.m; 559 ro = (struct route_in6 *)state.ro; 560 dst = (struct sockaddr_in6 *)state.dst; 561 if (error) { 562 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 563 m0 = m = NULL; 564 m = NULL; 565 switch (error) { 566 case EHOSTUNREACH: 567 case ENETUNREACH: 568 case EMSGSIZE: 569 case ENOBUFS: 570 case ENOMEM: 571 break; 572 default: 573 printf("ip6_output (ipsec): error code %d\n", error); 574 /* fall through */ 575 case ENOENT: 576 /* don't show these error codes to the user */ 577 error = 0; 578 break; 579 } 580 goto bad; 581 } 582 583 exthdrs.ip6e_ip6 = m; 584 } 585 #endif /* IPSEC */ 586 587 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 588 /* Unicast */ 589 590 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 591 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 592 /* xxx 593 * interface selection comes here 594 * if an interface is specified from an upper layer, 595 * ifp must point it. 596 */ 597 if (ro->ro_rt == 0) { 598 /* 599 * non-bsdi always clone routes, if parent is 600 * PRF_CLONING. 601 */ 602 rtalloc((struct route *)ro); 603 } 604 if (ro->ro_rt == 0) { 605 ip6stat.ip6s_noroute++; 606 error = EHOSTUNREACH; 607 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 608 goto bad; 609 } 610 ia = ifatoia6(ro->ro_rt->rt_ifa); 611 ifp = ro->ro_rt->rt_ifp; 612 ro->ro_rt->rt_use++; 613 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 614 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 615 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 616 617 in6_ifstat_inc(ifp, ifs6_out_request); 618 619 /* 620 * Check if the outgoing interface conflicts with 621 * the interface specified by ifi6_ifindex (if specified). 622 * Note that loopback interface is always okay. 623 * (this may happen when we are sending a packet to one of 624 * our own addresses.) 625 */ 626 if (opt && opt->ip6po_pktinfo 627 && opt->ip6po_pktinfo->ipi6_ifindex) { 628 if (!(ifp->if_flags & IFF_LOOPBACK) 629 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 630 ip6stat.ip6s_noroute++; 631 in6_ifstat_inc(ifp, ifs6_out_discard); 632 error = EHOSTUNREACH; 633 goto bad; 634 } 635 } 636 637 if (opt && opt->ip6po_hlim != -1) 638 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 639 } else { 640 /* Multicast */ 641 struct in6_multi *in6m; 642 643 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 644 645 /* 646 * See if the caller provided any multicast options 647 */ 648 ifp = NULL; 649 if (im6o != NULL) { 650 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 651 if (im6o->im6o_multicast_ifp != NULL) 652 ifp = im6o->im6o_multicast_ifp; 653 } else 654 ip6->ip6_hlim = ip6_defmcasthlim; 655 656 /* 657 * See if the caller provided the outgoing interface 658 * as an ancillary data. 659 * Boundary check for ifindex is assumed to be already done. 660 */ 661 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 662 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 663 664 /* 665 * If the destination is a node-local scope multicast, 666 * the packet should be loop-backed only. 667 */ 668 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 669 /* 670 * If the outgoing interface is already specified, 671 * it should be a loopback interface. 672 */ 673 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 674 ip6stat.ip6s_badscope++; 675 error = ENETUNREACH; /* XXX: better error? */ 676 /* XXX correct ifp? */ 677 in6_ifstat_inc(ifp, ifs6_out_discard); 678 goto bad; 679 } else { 680 ifp = &loif[0]; 681 } 682 } 683 684 if (opt && opt->ip6po_hlim != -1) 685 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 686 687 /* 688 * If caller did not provide an interface lookup a 689 * default in the routing table. This is either a 690 * default for the speicfied group (i.e. a host 691 * route), or a multicast default (a route for the 692 * ``net'' ff00::/8). 693 */ 694 if (ifp == NULL) { 695 if (ro->ro_rt == 0) { 696 ro->ro_rt = rtalloc1((struct sockaddr *) 697 &ro->ro_dst, 0, 0UL); 698 } 699 if (ro->ro_rt == 0) { 700 ip6stat.ip6s_noroute++; 701 error = EHOSTUNREACH; 702 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 703 goto bad; 704 } 705 ia = ifatoia6(ro->ro_rt->rt_ifa); 706 ifp = ro->ro_rt->rt_ifp; 707 ro->ro_rt->rt_use++; 708 } 709 710 if ((flags & IPV6_FORWARDING) == 0) 711 in6_ifstat_inc(ifp, ifs6_out_request); 712 in6_ifstat_inc(ifp, ifs6_out_mcast); 713 714 /* 715 * Confirm that the outgoing interface supports multicast. 716 */ 717 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 718 ip6stat.ip6s_noroute++; 719 in6_ifstat_inc(ifp, ifs6_out_discard); 720 error = ENETUNREACH; 721 goto bad; 722 } 723 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 724 if (in6m != NULL && 725 (im6o == NULL || im6o->im6o_multicast_loop)) { 726 /* 727 * If we belong to the destination multicast group 728 * on the outgoing interface, and the caller did not 729 * forbid loopback, loop back a copy. 730 */ 731 ip6_mloopback(ifp, m, dst); 732 } else { 733 /* 734 * If we are acting as a multicast router, perform 735 * multicast forwarding as if the packet had just 736 * arrived on the interface to which we are about 737 * to send. The multicast forwarding function 738 * recursively calls this function, using the 739 * IPV6_FORWARDING flag to prevent infinite recursion. 740 * 741 * Multicasts that are looped back by ip6_mloopback(), 742 * above, will be forwarded by the ip6_input() routine, 743 * if necessary. 744 */ 745 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 746 if (ip6_mforward(ip6, ifp, m) != 0) { 747 m_freem(m); 748 goto done; 749 } 750 } 751 } 752 /* 753 * Multicasts with a hoplimit of zero may be looped back, 754 * above, but must not be transmitted on a network. 755 * Also, multicasts addressed to the loopback interface 756 * are not sent -- the above call to ip6_mloopback() will 757 * loop back a copy if this host actually belongs to the 758 * destination group on the loopback interface. 759 */ 760 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 761 m_freem(m); 762 goto done; 763 } 764 } 765 766 /* 767 * Fill the outgoing inteface to tell the upper layer 768 * to increment per-interface statistics. 769 */ 770 if (ifpp) 771 *ifpp = ifp; 772 773 /* 774 * Determine path MTU. 775 */ 776 if (ro_pmtu != ro) { 777 /* The first hop and the final destination may differ. */ 778 struct sockaddr_in6 *sin6_fin = 779 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 780 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 781 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 782 &finaldst))) { 783 RTFREE(ro_pmtu->ro_rt); 784 ro_pmtu->ro_rt = (struct rtentry *)0; 785 } 786 if (ro_pmtu->ro_rt == 0) { 787 bzero(sin6_fin, sizeof(*sin6_fin)); 788 sin6_fin->sin6_family = AF_INET6; 789 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 790 sin6_fin->sin6_addr = finaldst; 791 792 rtalloc((struct route *)ro_pmtu); 793 } 794 } 795 if (ro_pmtu->ro_rt != NULL) { 796 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 797 798 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 799 if (mtu > ifmtu || mtu == 0) { 800 /* 801 * The MTU on the route is larger than the MTU on 802 * the interface! This shouldn't happen, unless the 803 * MTU of the interface has been changed after the 804 * interface was brought up. Change the MTU in the 805 * route to match the interface MTU (as long as the 806 * field isn't locked). 807 * 808 * if MTU on the route is 0, we need to fix the MTU. 809 * this case happens with path MTU discovery timeouts. 810 */ 811 mtu = ifmtu; 812 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 813 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 814 } 815 } else { 816 mtu = nd_ifinfo[ifp->if_index].linkmtu; 817 } 818 819 /* 820 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 821 */ 822 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 823 mtu = IPV6_MMTU; 824 825 /* Fake scoped addresses */ 826 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 827 /* 828 * If source or destination address is a scoped address, and 829 * the packet is going to be sent to a loopback interface, 830 * we should keep the original interface. 831 */ 832 833 /* 834 * XXX: this is a very experimental and temporary solution. 835 * We eventually have sockaddr_in6 and use the sin6_scope_id 836 * field of the structure here. 837 * We rely on the consistency between two scope zone ids 838 * of source and destination, which should already be assured. 839 * Larger scopes than link will be supported in the future. 840 */ 841 origifp = NULL; 842 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 843 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 844 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 845 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 846 /* 847 * XXX: origifp can be NULL even in those two cases above. 848 * For example, if we remove the (only) link-local address 849 * from the loopback interface, and try to send a link-local 850 * address without link-id information. Then the source 851 * address is ::1, and the destination address is the 852 * link-local address with its s6_addr16[1] being zero. 853 * What is worse, if the packet goes to the loopback interface 854 * by a default rejected route, the null pointer would be 855 * passed to looutput, and the kernel would hang. 856 * The following last resort would prevent such disaster. 857 */ 858 if (origifp == NULL) 859 origifp = ifp; 860 } 861 else 862 origifp = ifp; 863 #ifndef SCOPEDROUTING 864 /* 865 * clear embedded scope identifiers if necessary. 866 * in6_clearscope will touch the addresses only when necessary. 867 */ 868 in6_clearscope(&ip6->ip6_src); 869 in6_clearscope(&ip6->ip6_dst); 870 #endif 871 872 /* 873 * Check with the firewall... 874 */ 875 if (ip6_fw_enable && ip6_fw_chk_ptr) { 876 u_short port = 0; 877 m->m_pkthdr.rcvif = NULL; /* XXX */ 878 /* If ipfw says divert, we have to just drop packet */ 879 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 880 m_freem(m); 881 goto done; 882 } 883 if (!m) { 884 error = EACCES; 885 goto done; 886 } 887 } 888 889 /* 890 * If the outgoing packet contains a hop-by-hop options header, 891 * it must be examined and processed even by the source node. 892 * (RFC 2460, section 4.) 893 */ 894 if (exthdrs.ip6e_hbh) { 895 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 896 u_int32_t dummy1; /* XXX unused */ 897 u_int32_t dummy2; /* XXX unused */ 898 899 #ifdef DIAGNOSTIC 900 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 901 panic("ip6e_hbh is not continuous"); 902 #endif 903 /* 904 * XXX: if we have to send an ICMPv6 error to the sender, 905 * we need the M_LOOP flag since icmp6_error() expects 906 * the IPv6 and the hop-by-hop options header are 907 * continuous unless the flag is set. 908 */ 909 m->m_flags |= M_LOOP; 910 m->m_pkthdr.rcvif = ifp; 911 if (ip6_process_hopopts(m, 912 (u_int8_t *)(hbh + 1), 913 ((hbh->ip6h_len + 1) << 3) - 914 sizeof(struct ip6_hbh), 915 &dummy1, &dummy2) < 0) { 916 /* m was already freed at this point */ 917 error = EINVAL;/* better error? */ 918 goto done; 919 } 920 m->m_flags &= ~M_LOOP; /* XXX */ 921 m->m_pkthdr.rcvif = NULL; 922 } 923 924 /* 925 * Check if we want to allow this packet to be processed. 926 * Consider it to be bad if not. 927 */ 928 if (fr_checkp) { 929 struct mbuf *m1 = m; 930 931 if ((*fr_checkp)((struct ip *)ip6, sizeof(*ip6), ifp, 1, &m1)) 932 goto done; 933 m = m1; 934 if (m == NULL) 935 goto done; 936 ip6 = mtod(m, struct ip6_hdr *); 937 } 938 939 /* 940 * Send the packet to the outgoing interface. 941 * If necessary, do IPv6 fragmentation before sending. 942 */ 943 tlen = m->m_pkthdr.len; 944 if (tlen <= mtu 945 #ifdef notyet 946 /* 947 * On any link that cannot convey a 1280-octet packet in one piece, 948 * link-specific fragmentation and reassembly must be provided at 949 * a layer below IPv6. [RFC 2460, sec.5] 950 * Thus if the interface has ability of link-level fragmentation, 951 * we can just send the packet even if the packet size is 952 * larger than the link's MTU. 953 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 954 */ 955 956 || ifp->if_flags & IFF_FRAGMENTABLE 957 #endif 958 ) 959 { 960 /* Record statistics for this interface address. */ 961 if (ia && !(flags & IPV6_FORWARDING)) { 962 ia->ia_ifa.if_opackets++; 963 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 964 } 965 #ifdef IPSEC 966 /* clean ipsec history once it goes out of the node */ 967 ipsec_delaux(m); 968 #endif 969 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 970 goto done; 971 } else if (mtu < IPV6_MMTU) { 972 /* 973 * note that path MTU is never less than IPV6_MMTU 974 * (see icmp6_input). 975 */ 976 error = EMSGSIZE; 977 in6_ifstat_inc(ifp, ifs6_out_fragfail); 978 goto bad; 979 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 980 error = EMSGSIZE; 981 in6_ifstat_inc(ifp, ifs6_out_fragfail); 982 goto bad; 983 } else { 984 struct mbuf **mnext, *m_frgpart; 985 struct ip6_frag *ip6f; 986 u_int32_t id = htonl(ip6_id++); 987 u_char nextproto; 988 989 /* 990 * Too large for the destination or interface; 991 * fragment if possible. 992 * Must be able to put at least 8 bytes per fragment. 993 */ 994 hlen = unfragpartlen; 995 if (mtu > IPV6_MAXPACKET) 996 mtu = IPV6_MAXPACKET; 997 998 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 999 if (len < 8) { 1000 error = EMSGSIZE; 1001 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1002 goto bad; 1003 } 1004 1005 mnext = &m->m_nextpkt; 1006 1007 /* 1008 * Change the next header field of the last header in the 1009 * unfragmentable part. 1010 */ 1011 if (exthdrs.ip6e_rthdr) { 1012 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1013 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1014 } else if (exthdrs.ip6e_dest1) { 1015 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1016 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1017 } else if (exthdrs.ip6e_hbh) { 1018 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1019 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1020 } else { 1021 nextproto = ip6->ip6_nxt; 1022 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1023 } 1024 1025 /* 1026 * Loop through length of segment after first fragment, 1027 * make new header and copy data of each part and link onto 1028 * chain. 1029 */ 1030 m0 = m; 1031 for (off = hlen; off < tlen; off += len) { 1032 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1033 if (!m) { 1034 error = ENOBUFS; 1035 ip6stat.ip6s_odropped++; 1036 goto sendorfree; 1037 } 1038 m->m_pkthdr.rcvif = NULL; 1039 m->m_flags = m0->m_flags & M_COPYFLAGS; 1040 *mnext = m; 1041 mnext = &m->m_nextpkt; 1042 m->m_data += max_linkhdr; 1043 mhip6 = mtod(m, struct ip6_hdr *); 1044 *mhip6 = *ip6; 1045 m->m_len = sizeof(*mhip6); 1046 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1047 if (error) { 1048 ip6stat.ip6s_odropped++; 1049 goto sendorfree; 1050 } 1051 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1052 if (off + len >= tlen) 1053 len = tlen - off; 1054 else 1055 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1056 mhip6->ip6_plen = htons((u_short)(len + hlen + 1057 sizeof(*ip6f) - 1058 sizeof(struct ip6_hdr))); 1059 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1060 error = ENOBUFS; 1061 ip6stat.ip6s_odropped++; 1062 goto sendorfree; 1063 } 1064 m_cat(m, m_frgpart); 1065 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1066 m->m_pkthdr.rcvif = (struct ifnet *)0; 1067 ip6f->ip6f_reserved = 0; 1068 ip6f->ip6f_ident = id; 1069 ip6f->ip6f_nxt = nextproto; 1070 ip6stat.ip6s_ofragments++; 1071 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1072 } 1073 1074 in6_ifstat_inc(ifp, ifs6_out_fragok); 1075 } 1076 1077 /* 1078 * Remove leading garbages. 1079 */ 1080 sendorfree: 1081 m = m0->m_nextpkt; 1082 m0->m_nextpkt = 0; 1083 m_freem(m0); 1084 for (m0 = m; m; m = m0) { 1085 m0 = m->m_nextpkt; 1086 m->m_nextpkt = 0; 1087 if (error == 0) { 1088 /* Record statistics for this interface address. */ 1089 if (ia) { 1090 ia->ia_ifa.if_opackets++; 1091 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1092 } 1093 #ifdef IPSEC 1094 /* clean ipsec history once it goes out of the node */ 1095 ipsec_delaux(m); 1096 #endif 1097 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1098 } else 1099 m_freem(m); 1100 } 1101 1102 if (error == 0) 1103 ip6stat.ip6s_fragmented++; 1104 1105 done: 1106 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1107 RTFREE(ro->ro_rt); 1108 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1109 RTFREE(ro_pmtu->ro_rt); 1110 } 1111 1112 #ifdef IPSEC 1113 if (sp != NULL) 1114 key_freesp(sp); 1115 #endif /* IPSEC */ 1116 #ifdef FAST_IPSEC 1117 if (sp != NULL) 1118 KEY_FREESP(&sp); 1119 #endif /* FAST_IPSEC */ 1120 1121 return(error); 1122 1123 freehdrs: 1124 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1125 m_freem(exthdrs.ip6e_dest1); 1126 m_freem(exthdrs.ip6e_rthdr); 1127 m_freem(exthdrs.ip6e_dest2); 1128 /* fall through */ 1129 bad: 1130 m_freem(m); 1131 goto done; 1132 } 1133 1134 static int 1135 ip6_copyexthdr(mp, hdr, hlen) 1136 struct mbuf **mp; 1137 caddr_t hdr; 1138 int hlen; 1139 { 1140 struct mbuf *m; 1141 1142 if (hlen > MCLBYTES) 1143 return(ENOBUFS); /* XXX */ 1144 1145 MGET(m, M_DONTWAIT, MT_DATA); 1146 if (!m) 1147 return(ENOBUFS); 1148 1149 if (hlen > MLEN) { 1150 MCLGET(m, M_DONTWAIT); 1151 if ((m->m_flags & M_EXT) == 0) { 1152 m_free(m); 1153 return(ENOBUFS); 1154 } 1155 } 1156 m->m_len = hlen; 1157 if (hdr) 1158 bcopy(hdr, mtod(m, caddr_t), hlen); 1159 1160 *mp = m; 1161 return(0); 1162 } 1163 1164 /* 1165 * Insert jumbo payload option. 1166 */ 1167 static int 1168 ip6_insert_jumboopt(exthdrs, plen) 1169 struct ip6_exthdrs *exthdrs; 1170 u_int32_t plen; 1171 { 1172 struct mbuf *mopt; 1173 u_char *optbuf; 1174 u_int32_t v; 1175 1176 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1177 1178 /* 1179 * If there is no hop-by-hop options header, allocate new one. 1180 * If there is one but it doesn't have enough space to store the 1181 * jumbo payload option, allocate a cluster to store the whole options. 1182 * Otherwise, use it to store the options. 1183 */ 1184 if (exthdrs->ip6e_hbh == 0) { 1185 MGET(mopt, M_DONTWAIT, MT_DATA); 1186 if (mopt == 0) 1187 return(ENOBUFS); 1188 mopt->m_len = JUMBOOPTLEN; 1189 optbuf = mtod(mopt, u_char *); 1190 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1191 exthdrs->ip6e_hbh = mopt; 1192 } else { 1193 struct ip6_hbh *hbh; 1194 1195 mopt = exthdrs->ip6e_hbh; 1196 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1197 /* 1198 * XXX assumption: 1199 * - exthdrs->ip6e_hbh is not referenced from places 1200 * other than exthdrs. 1201 * - exthdrs->ip6e_hbh is not an mbuf chain. 1202 */ 1203 int oldoptlen = mopt->m_len; 1204 struct mbuf *n; 1205 1206 /* 1207 * XXX: give up if the whole (new) hbh header does 1208 * not fit even in an mbuf cluster. 1209 */ 1210 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1211 return(ENOBUFS); 1212 1213 /* 1214 * As a consequence, we must always prepare a cluster 1215 * at this point. 1216 */ 1217 MGET(n, M_DONTWAIT, MT_DATA); 1218 if (n) { 1219 MCLGET(n, M_DONTWAIT); 1220 if ((n->m_flags & M_EXT) == 0) { 1221 m_freem(n); 1222 n = NULL; 1223 } 1224 } 1225 if (!n) 1226 return(ENOBUFS); 1227 n->m_len = oldoptlen + JUMBOOPTLEN; 1228 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1229 oldoptlen); 1230 optbuf = mtod(n, caddr_t) + oldoptlen; 1231 m_freem(mopt); 1232 mopt = exthdrs->ip6e_hbh = n; 1233 } else { 1234 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1235 mopt->m_len += JUMBOOPTLEN; 1236 } 1237 optbuf[0] = IP6OPT_PADN; 1238 optbuf[1] = 1; 1239 1240 /* 1241 * Adjust the header length according to the pad and 1242 * the jumbo payload option. 1243 */ 1244 hbh = mtod(mopt, struct ip6_hbh *); 1245 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1246 } 1247 1248 /* fill in the option. */ 1249 optbuf[2] = IP6OPT_JUMBO; 1250 optbuf[3] = 4; 1251 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1252 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1253 1254 /* finally, adjust the packet header length */ 1255 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1256 1257 return(0); 1258 #undef JUMBOOPTLEN 1259 } 1260 1261 /* 1262 * Insert fragment header and copy unfragmentable header portions. 1263 */ 1264 static int 1265 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1266 struct mbuf *m0, *m; 1267 int hlen; 1268 struct ip6_frag **frghdrp; 1269 { 1270 struct mbuf *n, *mlast; 1271 1272 if (hlen > sizeof(struct ip6_hdr)) { 1273 n = m_copym(m0, sizeof(struct ip6_hdr), 1274 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1275 if (n == 0) 1276 return(ENOBUFS); 1277 m->m_next = n; 1278 } else 1279 n = m; 1280 1281 /* Search for the last mbuf of unfragmentable part. */ 1282 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1283 ; 1284 1285 if ((mlast->m_flags & M_EXT) == 0 && 1286 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1287 /* use the trailing space of the last mbuf for the fragment hdr */ 1288 *frghdrp = 1289 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1290 mlast->m_len += sizeof(struct ip6_frag); 1291 m->m_pkthdr.len += sizeof(struct ip6_frag); 1292 } else { 1293 /* allocate a new mbuf for the fragment header */ 1294 struct mbuf *mfrg; 1295 1296 MGET(mfrg, M_DONTWAIT, MT_DATA); 1297 if (mfrg == 0) 1298 return(ENOBUFS); 1299 mfrg->m_len = sizeof(struct ip6_frag); 1300 *frghdrp = mtod(mfrg, struct ip6_frag *); 1301 mlast->m_next = mfrg; 1302 } 1303 1304 return(0); 1305 } 1306 1307 /* 1308 * IP6 socket option processing. 1309 */ 1310 int 1311 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1312 { 1313 int privileged; 1314 struct inpcb *in6p = sotoinpcb(so); 1315 int error, optval; 1316 int level, op, optname; 1317 int optlen; 1318 struct thread *td; 1319 1320 if (sopt) { 1321 level = sopt->sopt_level; 1322 op = sopt->sopt_dir; 1323 optname = sopt->sopt_name; 1324 optlen = sopt->sopt_valsize; 1325 td = sopt->sopt_td; 1326 } else { 1327 panic("ip6_ctloutput: arg soopt is NULL"); 1328 /* NOT REACHED */ 1329 td = NULL; 1330 } 1331 error = optval = 0; 1332 1333 privileged = (td == NULL || suser(td)) ? 0 : 1; 1334 1335 if (level == IPPROTO_IPV6) { 1336 switch (op) { 1337 1338 case SOPT_SET: 1339 switch (optname) { 1340 case IPV6_PKTOPTIONS: 1341 { 1342 struct mbuf *m; 1343 1344 error = soopt_getm(sopt, &m); /* XXX */ 1345 if (error != NULL) 1346 break; 1347 error = soopt_mcopyin(sopt, m); /* XXX */ 1348 if (error != NULL) 1349 break; 1350 error = ip6_pcbopts(&in6p->in6p_outputopts, 1351 m, so, sopt); 1352 m_freem(m); /* XXX */ 1353 break; 1354 } 1355 1356 /* 1357 * Use of some Hop-by-Hop options or some 1358 * Destination options, might require special 1359 * privilege. That is, normal applications 1360 * (without special privilege) might be forbidden 1361 * from setting certain options in outgoing packets, 1362 * and might never see certain options in received 1363 * packets. [RFC 2292 Section 6] 1364 * KAME specific note: 1365 * KAME prevents non-privileged users from sending or 1366 * receiving ANY hbh/dst options in order to avoid 1367 * overhead of parsing options in the kernel. 1368 */ 1369 case IPV6_UNICAST_HOPS: 1370 case IPV6_CHECKSUM: 1371 case IPV6_FAITH: 1372 1373 case IPV6_V6ONLY: 1374 if (optlen != sizeof(int)) { 1375 error = EINVAL; 1376 break; 1377 } 1378 error = sooptcopyin(sopt, &optval, 1379 sizeof optval, sizeof optval); 1380 if (error) 1381 break; 1382 switch (optname) { 1383 1384 case IPV6_UNICAST_HOPS: 1385 if (optval < -1 || optval >= 256) 1386 error = EINVAL; 1387 else { 1388 /* -1 = kernel default */ 1389 in6p->in6p_hops = optval; 1390 1391 if ((in6p->in6p_vflag & 1392 INP_IPV4) != 0) 1393 in6p->inp_ip_ttl = optval; 1394 } 1395 break; 1396 #define OPTSET(bit) \ 1397 do { \ 1398 if (optval) \ 1399 in6p->in6p_flags |= (bit); \ 1400 else \ 1401 in6p->in6p_flags &= ~(bit); \ 1402 } while (0) 1403 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1404 1405 case IPV6_CHECKSUM: 1406 in6p->in6p_cksum = optval; 1407 break; 1408 1409 case IPV6_FAITH: 1410 OPTSET(IN6P_FAITH); 1411 break; 1412 1413 case IPV6_V6ONLY: 1414 /* 1415 * make setsockopt(IPV6_V6ONLY) 1416 * available only prior to bind(2). 1417 * see ipng mailing list, Jun 22 2001. 1418 */ 1419 if (in6p->in6p_lport || 1420 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1421 { 1422 error = EINVAL; 1423 break; 1424 } 1425 OPTSET(IN6P_IPV6_V6ONLY); 1426 if (optval) 1427 in6p->in6p_vflag &= ~INP_IPV4; 1428 else 1429 in6p->in6p_vflag |= INP_IPV4; 1430 break; 1431 } 1432 break; 1433 1434 case IPV6_PKTINFO: 1435 case IPV6_HOPLIMIT: 1436 case IPV6_HOPOPTS: 1437 case IPV6_DSTOPTS: 1438 case IPV6_RTHDR: 1439 /* RFC 2292 */ 1440 if (optlen != sizeof(int)) { 1441 error = EINVAL; 1442 break; 1443 } 1444 error = sooptcopyin(sopt, &optval, 1445 sizeof optval, sizeof optval); 1446 if (error) 1447 break; 1448 switch (optname) { 1449 case IPV6_PKTINFO: 1450 OPTSET(IN6P_PKTINFO); 1451 break; 1452 case IPV6_HOPLIMIT: 1453 OPTSET(IN6P_HOPLIMIT); 1454 break; 1455 case IPV6_HOPOPTS: 1456 /* 1457 * Check super-user privilege. 1458 * See comments for IPV6_RECVHOPOPTS. 1459 */ 1460 if (!privileged) 1461 return(EPERM); 1462 OPTSET(IN6P_HOPOPTS); 1463 break; 1464 case IPV6_DSTOPTS: 1465 if (!privileged) 1466 return(EPERM); 1467 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1468 break; 1469 case IPV6_RTHDR: 1470 OPTSET(IN6P_RTHDR); 1471 break; 1472 } 1473 break; 1474 #undef OPTSET 1475 1476 case IPV6_MULTICAST_IF: 1477 case IPV6_MULTICAST_HOPS: 1478 case IPV6_MULTICAST_LOOP: 1479 case IPV6_JOIN_GROUP: 1480 case IPV6_LEAVE_GROUP: 1481 { 1482 struct mbuf *m; 1483 if (sopt->sopt_valsize > MLEN) { 1484 error = EMSGSIZE; 1485 break; 1486 } 1487 /* XXX */ 1488 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_HEADER); 1489 if (m == 0) { 1490 error = ENOBUFS; 1491 break; 1492 } 1493 m->m_len = sopt->sopt_valsize; 1494 error = sooptcopyin(sopt, mtod(m, char *), 1495 m->m_len, m->m_len); 1496 error = ip6_setmoptions(sopt->sopt_name, 1497 &in6p->in6p_moptions, 1498 m); 1499 (void)m_free(m); 1500 } 1501 break; 1502 1503 case IPV6_PORTRANGE: 1504 error = sooptcopyin(sopt, &optval, 1505 sizeof optval, sizeof optval); 1506 if (error) 1507 break; 1508 1509 switch (optval) { 1510 case IPV6_PORTRANGE_DEFAULT: 1511 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1512 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1513 break; 1514 1515 case IPV6_PORTRANGE_HIGH: 1516 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1517 in6p->in6p_flags |= IN6P_HIGHPORT; 1518 break; 1519 1520 case IPV6_PORTRANGE_LOW: 1521 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1522 in6p->in6p_flags |= IN6P_LOWPORT; 1523 break; 1524 1525 default: 1526 error = EINVAL; 1527 break; 1528 } 1529 break; 1530 1531 #if defined(IPSEC) || defined(FAST_IPSEC) 1532 case IPV6_IPSEC_POLICY: 1533 { 1534 caddr_t req = NULL; 1535 size_t len = 0; 1536 struct mbuf *m; 1537 1538 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1539 break; 1540 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1541 break; 1542 if (m) { 1543 req = mtod(m, caddr_t); 1544 len = m->m_len; 1545 } 1546 error = ipsec6_set_policy(in6p, optname, req, 1547 len, privileged); 1548 m_freem(m); 1549 } 1550 break; 1551 #endif /* KAME IPSEC */ 1552 1553 case IPV6_FW_ADD: 1554 case IPV6_FW_DEL: 1555 case IPV6_FW_FLUSH: 1556 case IPV6_FW_ZERO: 1557 { 1558 struct mbuf *m; 1559 struct mbuf **mp = &m; 1560 1561 if (ip6_fw_ctl_ptr == NULL) 1562 return EINVAL; 1563 /* XXX */ 1564 if ((error = soopt_getm(sopt, &m)) != 0) 1565 break; 1566 /* XXX */ 1567 if ((error = soopt_mcopyin(sopt, m)) != 0) 1568 break; 1569 error = (*ip6_fw_ctl_ptr)(optname, mp); 1570 m = *mp; 1571 } 1572 break; 1573 1574 default: 1575 error = ENOPROTOOPT; 1576 break; 1577 } 1578 break; 1579 1580 case SOPT_GET: 1581 switch (optname) { 1582 1583 case IPV6_PKTOPTIONS: 1584 if (in6p->in6p_options) { 1585 struct mbuf *m; 1586 m = m_copym(in6p->in6p_options, 1587 0, M_COPYALL, M_WAIT); 1588 error = soopt_mcopyout(sopt, m); 1589 if (error == 0) 1590 m_freem(m); 1591 } else 1592 sopt->sopt_valsize = 0; 1593 break; 1594 1595 case IPV6_UNICAST_HOPS: 1596 case IPV6_CHECKSUM: 1597 1598 case IPV6_FAITH: 1599 case IPV6_V6ONLY: 1600 case IPV6_PORTRANGE: 1601 switch (optname) { 1602 1603 case IPV6_UNICAST_HOPS: 1604 optval = in6p->in6p_hops; 1605 break; 1606 1607 case IPV6_CHECKSUM: 1608 optval = in6p->in6p_cksum; 1609 break; 1610 1611 case IPV6_FAITH: 1612 optval = OPTBIT(IN6P_FAITH); 1613 break; 1614 1615 case IPV6_V6ONLY: 1616 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1617 break; 1618 1619 case IPV6_PORTRANGE: 1620 { 1621 int flags; 1622 flags = in6p->in6p_flags; 1623 if (flags & IN6P_HIGHPORT) 1624 optval = IPV6_PORTRANGE_HIGH; 1625 else if (flags & IN6P_LOWPORT) 1626 optval = IPV6_PORTRANGE_LOW; 1627 else 1628 optval = 0; 1629 break; 1630 } 1631 } 1632 error = sooptcopyout(sopt, &optval, 1633 sizeof optval); 1634 break; 1635 1636 case IPV6_PKTINFO: 1637 case IPV6_HOPLIMIT: 1638 case IPV6_HOPOPTS: 1639 case IPV6_RTHDR: 1640 case IPV6_DSTOPTS: 1641 if (optname == IPV6_HOPOPTS || 1642 optname == IPV6_DSTOPTS || 1643 !privileged) 1644 return(EPERM); 1645 switch (optname) { 1646 case IPV6_PKTINFO: 1647 optval = OPTBIT(IN6P_PKTINFO); 1648 break; 1649 case IPV6_HOPLIMIT: 1650 optval = OPTBIT(IN6P_HOPLIMIT); 1651 break; 1652 case IPV6_HOPOPTS: 1653 if (!privileged) 1654 return(EPERM); 1655 optval = OPTBIT(IN6P_HOPOPTS); 1656 break; 1657 case IPV6_RTHDR: 1658 optval = OPTBIT(IN6P_RTHDR); 1659 break; 1660 case IPV6_DSTOPTS: 1661 if (!privileged) 1662 return(EPERM); 1663 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1664 break; 1665 } 1666 error = sooptcopyout(sopt, &optval, 1667 sizeof optval); 1668 break; 1669 1670 case IPV6_MULTICAST_IF: 1671 case IPV6_MULTICAST_HOPS: 1672 case IPV6_MULTICAST_LOOP: 1673 case IPV6_JOIN_GROUP: 1674 case IPV6_LEAVE_GROUP: 1675 { 1676 struct mbuf *m; 1677 error = ip6_getmoptions(sopt->sopt_name, 1678 in6p->in6p_moptions, &m); 1679 if (error == 0) 1680 error = sooptcopyout(sopt, 1681 mtod(m, char *), m->m_len); 1682 m_freem(m); 1683 } 1684 break; 1685 1686 #if defined(IPSEC) || defined(FAST_IPSEC) 1687 case IPV6_IPSEC_POLICY: 1688 { 1689 caddr_t req = NULL; 1690 size_t len = 0; 1691 struct mbuf *m = NULL; 1692 struct mbuf **mp = &m; 1693 1694 error = soopt_getm(sopt, &m); /* XXX */ 1695 if (error != NULL) 1696 break; 1697 error = soopt_mcopyin(sopt, m); /* XXX */ 1698 if (error != NULL) 1699 break; 1700 if (m) { 1701 req = mtod(m, caddr_t); 1702 len = m->m_len; 1703 } 1704 error = ipsec6_get_policy(in6p, req, len, mp); 1705 if (error == 0) 1706 error = soopt_mcopyout(sopt, m); /*XXX*/ 1707 if (error == 0 && m) 1708 m_freem(m); 1709 break; 1710 } 1711 #endif /* KAME IPSEC */ 1712 1713 case IPV6_FW_GET: 1714 { 1715 struct mbuf *m; 1716 struct mbuf **mp = &m; 1717 1718 if (ip6_fw_ctl_ptr == NULL) 1719 { 1720 return EINVAL; 1721 } 1722 error = (*ip6_fw_ctl_ptr)(optname, mp); 1723 if (error == 0) 1724 error = soopt_mcopyout(sopt, m); /* XXX */ 1725 if (error == 0 && m) 1726 m_freem(m); 1727 } 1728 break; 1729 1730 default: 1731 error = ENOPROTOOPT; 1732 break; 1733 } 1734 break; 1735 } 1736 } else { 1737 error = EINVAL; 1738 } 1739 return(error); 1740 } 1741 1742 /* 1743 * Set up IP6 options in pcb for insertion in output packets or 1744 * specifying behavior of outgoing packets. 1745 */ 1746 static int 1747 ip6_pcbopts(pktopt, m, so, sopt) 1748 struct ip6_pktopts **pktopt; 1749 struct mbuf *m; 1750 struct socket *so; 1751 struct sockopt *sopt; 1752 { 1753 struct ip6_pktopts *opt = *pktopt; 1754 int error = 0; 1755 struct thread *td = sopt->sopt_td; 1756 int priv = 0; 1757 1758 /* turn off any old options. */ 1759 if (opt) { 1760 #ifdef DIAGNOSTIC 1761 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1762 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1763 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1764 printf("ip6_pcbopts: all specified options are cleared.\n"); 1765 #endif 1766 ip6_clearpktopts(opt, 1, -1); 1767 } else 1768 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1769 *pktopt = NULL; 1770 1771 if (!m || m->m_len == 0) { 1772 /* 1773 * Only turning off any previous options, regardless of 1774 * whether the opt is just created or given. 1775 */ 1776 free(opt, M_IP6OPT); 1777 return(0); 1778 } 1779 1780 /* set options specified by user. */ 1781 if (suser(td) == 0) 1782 priv = 1; 1783 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1784 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1785 free(opt, M_IP6OPT); 1786 return(error); 1787 } 1788 *pktopt = opt; 1789 return(0); 1790 } 1791 1792 /* 1793 * initialize ip6_pktopts. beware that there are non-zero default values in 1794 * the struct. 1795 */ 1796 void 1797 init_ip6pktopts(opt) 1798 struct ip6_pktopts *opt; 1799 { 1800 1801 bzero(opt, sizeof(*opt)); 1802 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1803 } 1804 1805 void 1806 ip6_clearpktopts(pktopt, needfree, optname) 1807 struct ip6_pktopts *pktopt; 1808 int needfree, optname; 1809 { 1810 if (pktopt == NULL) 1811 return; 1812 1813 if (optname == -1) { 1814 if (needfree && pktopt->ip6po_pktinfo) 1815 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1816 pktopt->ip6po_pktinfo = NULL; 1817 } 1818 if (optname == -1) 1819 pktopt->ip6po_hlim = -1; 1820 if (optname == -1) { 1821 if (needfree && pktopt->ip6po_nexthop) 1822 free(pktopt->ip6po_nexthop, M_IP6OPT); 1823 pktopt->ip6po_nexthop = NULL; 1824 } 1825 if (optname == -1) { 1826 if (needfree && pktopt->ip6po_hbh) 1827 free(pktopt->ip6po_hbh, M_IP6OPT); 1828 pktopt->ip6po_hbh = NULL; 1829 } 1830 if (optname == -1) { 1831 if (needfree && pktopt->ip6po_dest1) 1832 free(pktopt->ip6po_dest1, M_IP6OPT); 1833 pktopt->ip6po_dest1 = NULL; 1834 } 1835 if (optname == -1) { 1836 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1837 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1838 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1839 if (pktopt->ip6po_route.ro_rt) { 1840 RTFREE(pktopt->ip6po_route.ro_rt); 1841 pktopt->ip6po_route.ro_rt = NULL; 1842 } 1843 } 1844 if (optname == -1) { 1845 if (needfree && pktopt->ip6po_dest2) 1846 free(pktopt->ip6po_dest2, M_IP6OPT); 1847 pktopt->ip6po_dest2 = NULL; 1848 } 1849 } 1850 1851 #define PKTOPT_EXTHDRCPY(type) \ 1852 do {\ 1853 if (src->type) {\ 1854 int hlen =\ 1855 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1856 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1857 if (dst->type == NULL && canwait == M_NOWAIT)\ 1858 goto bad;\ 1859 bcopy(src->type, dst->type, hlen);\ 1860 }\ 1861 } while (0) 1862 1863 struct ip6_pktopts * 1864 ip6_copypktopts(src, canwait) 1865 struct ip6_pktopts *src; 1866 int canwait; 1867 { 1868 struct ip6_pktopts *dst; 1869 1870 if (src == NULL) { 1871 printf("ip6_clearpktopts: invalid argument\n"); 1872 return(NULL); 1873 } 1874 1875 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1876 if (dst == NULL && canwait == M_NOWAIT) 1877 return (NULL); 1878 bzero(dst, sizeof(*dst)); 1879 1880 dst->ip6po_hlim = src->ip6po_hlim; 1881 if (src->ip6po_pktinfo) { 1882 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1883 M_IP6OPT, canwait); 1884 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1885 goto bad; 1886 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1887 } 1888 if (src->ip6po_nexthop) { 1889 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1890 M_IP6OPT, canwait); 1891 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1892 goto bad; 1893 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1894 src->ip6po_nexthop->sa_len); 1895 } 1896 PKTOPT_EXTHDRCPY(ip6po_hbh); 1897 PKTOPT_EXTHDRCPY(ip6po_dest1); 1898 PKTOPT_EXTHDRCPY(ip6po_dest2); 1899 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1900 return(dst); 1901 1902 bad: 1903 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1904 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1905 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1906 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1907 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1908 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1909 free(dst, M_IP6OPT); 1910 return(NULL); 1911 } 1912 #undef PKTOPT_EXTHDRCPY 1913 1914 void 1915 ip6_freepcbopts(pktopt) 1916 struct ip6_pktopts *pktopt; 1917 { 1918 if (pktopt == NULL) 1919 return; 1920 1921 ip6_clearpktopts(pktopt, 1, -1); 1922 1923 free(pktopt, M_IP6OPT); 1924 } 1925 1926 /* 1927 * Set the IP6 multicast options in response to user setsockopt(). 1928 */ 1929 static int 1930 ip6_setmoptions(optname, im6op, m) 1931 int optname; 1932 struct ip6_moptions **im6op; 1933 struct mbuf *m; 1934 { 1935 int error = 0; 1936 u_int loop, ifindex; 1937 struct ipv6_mreq *mreq; 1938 struct ifnet *ifp; 1939 struct ip6_moptions *im6o = *im6op; 1940 struct route_in6 ro; 1941 struct sockaddr_in6 *dst; 1942 struct in6_multi_mship *imm; 1943 struct thread *td = curthread; /* XXX */ 1944 1945 if (im6o == NULL) { 1946 /* 1947 * No multicast option buffer attached to the pcb; 1948 * allocate one and initialize to default values. 1949 */ 1950 im6o = (struct ip6_moptions *) 1951 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1952 1953 if (im6o == NULL) 1954 return(ENOBUFS); 1955 *im6op = im6o; 1956 im6o->im6o_multicast_ifp = NULL; 1957 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1958 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1959 LIST_INIT(&im6o->im6o_memberships); 1960 } 1961 1962 switch (optname) { 1963 1964 case IPV6_MULTICAST_IF: 1965 /* 1966 * Select the interface for outgoing multicast packets. 1967 */ 1968 if (m == NULL || m->m_len != sizeof(u_int)) { 1969 error = EINVAL; 1970 break; 1971 } 1972 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1973 if (ifindex < 0 || if_index < ifindex) { 1974 error = ENXIO; /* XXX EINVAL? */ 1975 break; 1976 } 1977 ifp = ifindex2ifnet[ifindex]; 1978 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1979 error = EADDRNOTAVAIL; 1980 break; 1981 } 1982 im6o->im6o_multicast_ifp = ifp; 1983 break; 1984 1985 case IPV6_MULTICAST_HOPS: 1986 { 1987 /* 1988 * Set the IP6 hoplimit for outgoing multicast packets. 1989 */ 1990 int optval; 1991 if (m == NULL || m->m_len != sizeof(int)) { 1992 error = EINVAL; 1993 break; 1994 } 1995 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1996 if (optval < -1 || optval >= 256) 1997 error = EINVAL; 1998 else if (optval == -1) 1999 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2000 else 2001 im6o->im6o_multicast_hlim = optval; 2002 break; 2003 } 2004 2005 case IPV6_MULTICAST_LOOP: 2006 /* 2007 * Set the loopback flag for outgoing multicast packets. 2008 * Must be zero or one. 2009 */ 2010 if (m == NULL || m->m_len != sizeof(u_int)) { 2011 error = EINVAL; 2012 break; 2013 } 2014 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2015 if (loop > 1) { 2016 error = EINVAL; 2017 break; 2018 } 2019 im6o->im6o_multicast_loop = loop; 2020 break; 2021 2022 case IPV6_JOIN_GROUP: 2023 /* 2024 * Add a multicast group membership. 2025 * Group must be a valid IP6 multicast address. 2026 */ 2027 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2028 error = EINVAL; 2029 break; 2030 } 2031 mreq = mtod(m, struct ipv6_mreq *); 2032 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2033 /* 2034 * We use the unspecified address to specify to accept 2035 * all multicast addresses. Only super user is allowed 2036 * to do this. 2037 */ 2038 if (suser(td)) 2039 { 2040 error = EACCES; 2041 break; 2042 } 2043 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2044 error = EINVAL; 2045 break; 2046 } 2047 2048 /* 2049 * If the interface is specified, validate it. 2050 */ 2051 if (mreq->ipv6mr_interface < 0 2052 || if_index < mreq->ipv6mr_interface) { 2053 error = ENXIO; /* XXX EINVAL? */ 2054 break; 2055 } 2056 /* 2057 * If no interface was explicitly specified, choose an 2058 * appropriate one according to the given multicast address. 2059 */ 2060 if (mreq->ipv6mr_interface == 0) { 2061 /* 2062 * If the multicast address is in node-local scope, 2063 * the interface should be a loopback interface. 2064 * Otherwise, look up the routing table for the 2065 * address, and choose the outgoing interface. 2066 * XXX: is it a good approach? 2067 */ 2068 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2069 ifp = &loif[0]; 2070 } else { 2071 ro.ro_rt = NULL; 2072 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2073 bzero(dst, sizeof(*dst)); 2074 dst->sin6_len = sizeof(struct sockaddr_in6); 2075 dst->sin6_family = AF_INET6; 2076 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2077 rtalloc((struct route *)&ro); 2078 if (ro.ro_rt == NULL) { 2079 error = EADDRNOTAVAIL; 2080 break; 2081 } 2082 ifp = ro.ro_rt->rt_ifp; 2083 rtfree(ro.ro_rt); 2084 } 2085 } else 2086 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2087 2088 /* 2089 * See if we found an interface, and confirm that it 2090 * supports multicast 2091 */ 2092 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2093 error = EADDRNOTAVAIL; 2094 break; 2095 } 2096 /* 2097 * Put interface index into the multicast address, 2098 * if the address has link-local scope. 2099 */ 2100 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2101 mreq->ipv6mr_multiaddr.s6_addr16[1] 2102 = htons(mreq->ipv6mr_interface); 2103 } 2104 /* 2105 * See if the membership already exists. 2106 */ 2107 for (imm = im6o->im6o_memberships.lh_first; 2108 imm != NULL; imm = imm->i6mm_chain.le_next) 2109 if (imm->i6mm_maddr->in6m_ifp == ifp && 2110 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2111 &mreq->ipv6mr_multiaddr)) 2112 break; 2113 if (imm != NULL) { 2114 error = EADDRINUSE; 2115 break; 2116 } 2117 /* 2118 * Everything looks good; add a new record to the multicast 2119 * address list for the given interface. 2120 */ 2121 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2122 if (imm == NULL) { 2123 error = ENOBUFS; 2124 break; 2125 } 2126 if ((imm->i6mm_maddr = 2127 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2128 free(imm, M_IPMADDR); 2129 break; 2130 } 2131 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2132 break; 2133 2134 case IPV6_LEAVE_GROUP: 2135 /* 2136 * Drop a multicast group membership. 2137 * Group must be a valid IP6 multicast address. 2138 */ 2139 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2140 error = EINVAL; 2141 break; 2142 } 2143 mreq = mtod(m, struct ipv6_mreq *); 2144 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2145 if (suser(td)) { 2146 error = EACCES; 2147 break; 2148 } 2149 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2150 error = EINVAL; 2151 break; 2152 } 2153 /* 2154 * If an interface address was specified, get a pointer 2155 * to its ifnet structure. 2156 */ 2157 if (mreq->ipv6mr_interface < 0 2158 || if_index < mreq->ipv6mr_interface) { 2159 error = ENXIO; /* XXX EINVAL? */ 2160 break; 2161 } 2162 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2163 /* 2164 * Put interface index into the multicast address, 2165 * if the address has link-local scope. 2166 */ 2167 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2168 mreq->ipv6mr_multiaddr.s6_addr16[1] 2169 = htons(mreq->ipv6mr_interface); 2170 } 2171 /* 2172 * Find the membership in the membership list. 2173 */ 2174 for (imm = im6o->im6o_memberships.lh_first; 2175 imm != NULL; imm = imm->i6mm_chain.le_next) { 2176 if ((ifp == NULL || 2177 imm->i6mm_maddr->in6m_ifp == ifp) && 2178 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2179 &mreq->ipv6mr_multiaddr)) 2180 break; 2181 } 2182 if (imm == NULL) { 2183 /* Unable to resolve interface */ 2184 error = EADDRNOTAVAIL; 2185 break; 2186 } 2187 /* 2188 * Give up the multicast address record to which the 2189 * membership points. 2190 */ 2191 LIST_REMOVE(imm, i6mm_chain); 2192 in6_delmulti(imm->i6mm_maddr); 2193 free(imm, M_IPMADDR); 2194 break; 2195 2196 default: 2197 error = EOPNOTSUPP; 2198 break; 2199 } 2200 2201 /* 2202 * If all options have default values, no need to keep the mbuf. 2203 */ 2204 if (im6o->im6o_multicast_ifp == NULL && 2205 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2206 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2207 im6o->im6o_memberships.lh_first == NULL) { 2208 free(*im6op, M_IPMOPTS); 2209 *im6op = NULL; 2210 } 2211 2212 return(error); 2213 } 2214 2215 /* 2216 * Return the IP6 multicast options in response to user getsockopt(). 2217 */ 2218 static int 2219 ip6_getmoptions(optname, im6o, mp) 2220 int optname; 2221 struct ip6_moptions *im6o; 2222 struct mbuf **mp; 2223 { 2224 u_int *hlim, *loop, *ifindex; 2225 2226 *mp = m_get(M_WAIT, MT_HEADER); /* XXX */ 2227 2228 switch (optname) { 2229 2230 case IPV6_MULTICAST_IF: 2231 ifindex = mtod(*mp, u_int *); 2232 (*mp)->m_len = sizeof(u_int); 2233 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2234 *ifindex = 0; 2235 else 2236 *ifindex = im6o->im6o_multicast_ifp->if_index; 2237 return(0); 2238 2239 case IPV6_MULTICAST_HOPS: 2240 hlim = mtod(*mp, u_int *); 2241 (*mp)->m_len = sizeof(u_int); 2242 if (im6o == NULL) 2243 *hlim = ip6_defmcasthlim; 2244 else 2245 *hlim = im6o->im6o_multicast_hlim; 2246 return(0); 2247 2248 case IPV6_MULTICAST_LOOP: 2249 loop = mtod(*mp, u_int *); 2250 (*mp)->m_len = sizeof(u_int); 2251 if (im6o == NULL) 2252 *loop = ip6_defmcasthlim; 2253 else 2254 *loop = im6o->im6o_multicast_loop; 2255 return(0); 2256 2257 default: 2258 return(EOPNOTSUPP); 2259 } 2260 } 2261 2262 /* 2263 * Discard the IP6 multicast options. 2264 */ 2265 void 2266 ip6_freemoptions(im6o) 2267 struct ip6_moptions *im6o; 2268 { 2269 struct in6_multi_mship *imm; 2270 2271 if (im6o == NULL) 2272 return; 2273 2274 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2275 LIST_REMOVE(imm, i6mm_chain); 2276 if (imm->i6mm_maddr) 2277 in6_delmulti(imm->i6mm_maddr); 2278 free(imm, M_IPMADDR); 2279 } 2280 free(im6o, M_IPMOPTS); 2281 } 2282 2283 /* 2284 * Set IPv6 outgoing packet options based on advanced API. 2285 */ 2286 int 2287 ip6_setpktoptions(control, opt, priv, needcopy) 2288 struct mbuf *control; 2289 struct ip6_pktopts *opt; 2290 int priv, needcopy; 2291 { 2292 struct cmsghdr *cm = 0; 2293 2294 if (control == 0 || opt == 0) 2295 return(EINVAL); 2296 2297 init_ip6pktopts(opt); 2298 2299 /* 2300 * XXX: Currently, we assume all the optional information is stored 2301 * in a single mbuf. 2302 */ 2303 if (control->m_next) 2304 return(EINVAL); 2305 2306 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2307 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2308 cm = mtod(control, struct cmsghdr *); 2309 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2310 return(EINVAL); 2311 if (cm->cmsg_level != IPPROTO_IPV6) 2312 continue; 2313 2314 /* 2315 * XXX should check if RFC2292 API is mixed with 2292bis API 2316 */ 2317 switch (cm->cmsg_type) { 2318 case IPV6_PKTINFO: 2319 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2320 return(EINVAL); 2321 if (needcopy) { 2322 /* XXX: Is it really WAITOK? */ 2323 opt->ip6po_pktinfo = 2324 malloc(sizeof(struct in6_pktinfo), 2325 M_IP6OPT, M_WAITOK); 2326 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2327 sizeof(struct in6_pktinfo)); 2328 } else 2329 opt->ip6po_pktinfo = 2330 (struct in6_pktinfo *)CMSG_DATA(cm); 2331 if (opt->ip6po_pktinfo->ipi6_ifindex && 2332 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2333 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2334 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2335 2336 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2337 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2338 return(ENXIO); 2339 } 2340 2341 /* 2342 * Check if the requested source address is indeed a 2343 * unicast address assigned to the node, and can be 2344 * used as the packet's source address. 2345 */ 2346 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2347 struct in6_ifaddr *ia6; 2348 struct sockaddr_in6 sin6; 2349 2350 bzero(&sin6, sizeof(sin6)); 2351 sin6.sin6_len = sizeof(sin6); 2352 sin6.sin6_family = AF_INET6; 2353 sin6.sin6_addr = 2354 opt->ip6po_pktinfo->ipi6_addr; 2355 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2356 if (ia6 == NULL || 2357 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2358 IN6_IFF_NOTREADY)) != 0) 2359 return(EADDRNOTAVAIL); 2360 } 2361 break; 2362 2363 case IPV6_HOPLIMIT: 2364 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2365 return(EINVAL); 2366 2367 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2368 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2369 return(EINVAL); 2370 break; 2371 2372 case IPV6_NEXTHOP: 2373 if (!priv) 2374 return(EPERM); 2375 2376 if (cm->cmsg_len < sizeof(u_char) || 2377 /* check if cmsg_len is large enough for sa_len */ 2378 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2379 return(EINVAL); 2380 2381 if (needcopy) { 2382 opt->ip6po_nexthop = 2383 malloc(*CMSG_DATA(cm), 2384 M_IP6OPT, M_WAITOK); 2385 bcopy(CMSG_DATA(cm), 2386 opt->ip6po_nexthop, 2387 *CMSG_DATA(cm)); 2388 } else 2389 opt->ip6po_nexthop = 2390 (struct sockaddr *)CMSG_DATA(cm); 2391 break; 2392 2393 case IPV6_HOPOPTS: 2394 { 2395 struct ip6_hbh *hbh; 2396 int hbhlen; 2397 2398 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2399 return(EINVAL); 2400 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2401 hbhlen = (hbh->ip6h_len + 1) << 3; 2402 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2403 return(EINVAL); 2404 2405 if (needcopy) { 2406 opt->ip6po_hbh = 2407 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2408 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2409 } else 2410 opt->ip6po_hbh = hbh; 2411 break; 2412 } 2413 2414 case IPV6_DSTOPTS: 2415 { 2416 struct ip6_dest *dest, **newdest; 2417 int destlen; 2418 2419 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2420 return(EINVAL); 2421 dest = (struct ip6_dest *)CMSG_DATA(cm); 2422 destlen = (dest->ip6d_len + 1) << 3; 2423 if (cm->cmsg_len != CMSG_LEN(destlen)) 2424 return(EINVAL); 2425 2426 /* 2427 * The old advacned API is ambiguous on this 2428 * point. Our approach is to determine the 2429 * position based according to the existence 2430 * of a routing header. Note, however, that 2431 * this depends on the order of the extension 2432 * headers in the ancillary data; the 1st part 2433 * of the destination options header must 2434 * appear before the routing header in the 2435 * ancillary data, too. 2436 * RFC2292bis solved the ambiguity by 2437 * introducing separate cmsg types. 2438 */ 2439 if (opt->ip6po_rthdr == NULL) 2440 newdest = &opt->ip6po_dest1; 2441 else 2442 newdest = &opt->ip6po_dest2; 2443 2444 if (needcopy) { 2445 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2446 bcopy(dest, *newdest, destlen); 2447 } else 2448 *newdest = dest; 2449 2450 break; 2451 } 2452 2453 case IPV6_RTHDR: 2454 { 2455 struct ip6_rthdr *rth; 2456 int rthlen; 2457 2458 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2459 return(EINVAL); 2460 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2461 rthlen = (rth->ip6r_len + 1) << 3; 2462 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2463 return(EINVAL); 2464 2465 switch (rth->ip6r_type) { 2466 case IPV6_RTHDR_TYPE_0: 2467 /* must contain one addr */ 2468 if (rth->ip6r_len == 0) 2469 return(EINVAL); 2470 /* length must be even */ 2471 if (rth->ip6r_len % 2) 2472 return(EINVAL); 2473 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2474 return(EINVAL); 2475 break; 2476 default: 2477 return(EINVAL); /* not supported */ 2478 } 2479 2480 if (needcopy) { 2481 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2482 M_WAITOK); 2483 bcopy(rth, opt->ip6po_rthdr, rthlen); 2484 } else 2485 opt->ip6po_rthdr = rth; 2486 2487 break; 2488 } 2489 2490 default: 2491 return(ENOPROTOOPT); 2492 } 2493 } 2494 2495 return(0); 2496 } 2497 2498 /* 2499 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2500 * packet to the input queue of a specified interface. Note that this 2501 * calls the output routine of the loopback "driver", but with an interface 2502 * pointer that might NOT be &loif -- easier than replicating that code here. 2503 */ 2504 void 2505 ip6_mloopback(ifp, m, dst) 2506 struct ifnet *ifp; 2507 struct mbuf *m; 2508 struct sockaddr_in6 *dst; 2509 { 2510 struct mbuf *copym; 2511 struct ip6_hdr *ip6; 2512 2513 copym = m_copy(m, 0, M_COPYALL); 2514 if (copym == NULL) 2515 return; 2516 2517 /* 2518 * Make sure to deep-copy IPv6 header portion in case the data 2519 * is in an mbuf cluster, so that we can safely override the IPv6 2520 * header portion later. 2521 */ 2522 if ((copym->m_flags & M_EXT) != 0 || 2523 copym->m_len < sizeof(struct ip6_hdr)) { 2524 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2525 if (copym == NULL) 2526 return; 2527 } 2528 2529 #ifdef DIAGNOSTIC 2530 if (copym->m_len < sizeof(*ip6)) { 2531 m_freem(copym); 2532 return; 2533 } 2534 #endif 2535 2536 ip6 = mtod(copym, struct ip6_hdr *); 2537 #ifndef SCOPEDROUTING 2538 /* 2539 * clear embedded scope identifiers if necessary. 2540 * in6_clearscope will touch the addresses only when necessary. 2541 */ 2542 in6_clearscope(&ip6->ip6_src); 2543 in6_clearscope(&ip6->ip6_dst); 2544 #endif 2545 2546 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2547 } 2548 2549 /* 2550 * Chop IPv6 header off from the payload. 2551 */ 2552 static int 2553 ip6_splithdr(m, exthdrs) 2554 struct mbuf *m; 2555 struct ip6_exthdrs *exthdrs; 2556 { 2557 struct mbuf *mh; 2558 struct ip6_hdr *ip6; 2559 2560 ip6 = mtod(m, struct ip6_hdr *); 2561 if (m->m_len > sizeof(*ip6)) { 2562 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2563 if (mh == 0) { 2564 m_freem(m); 2565 return ENOBUFS; 2566 } 2567 M_MOVE_PKTHDR(mh, m); 2568 MH_ALIGN(mh, sizeof(*ip6)); 2569 m->m_len -= sizeof(*ip6); 2570 m->m_data += sizeof(*ip6); 2571 mh->m_next = m; 2572 m = mh; 2573 m->m_len = sizeof(*ip6); 2574 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2575 } 2576 exthdrs->ip6e_ip6 = m; 2577 return 0; 2578 } 2579 2580 /* 2581 * Compute IPv6 extension header length. 2582 */ 2583 int 2584 ip6_optlen(in6p) 2585 struct in6pcb *in6p; 2586 { 2587 int len; 2588 2589 if (!in6p->in6p_outputopts) 2590 return 0; 2591 2592 len = 0; 2593 #define elen(x) \ 2594 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2595 2596 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2597 if (in6p->in6p_outputopts->ip6po_rthdr) 2598 /* dest1 is valid with rthdr only */ 2599 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2600 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2601 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2602 return len; 2603 #undef elen 2604 } 2605