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sys/bsd/netinet6/ip6_output.c
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1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.43 2002/10/31 19:45:48 ume Exp $ */ 2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/errno.h> 73 #include <sys/protosw.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/systm.h> 77 #include <sys/kernel.h> 78 #include <sys/proc.h> 79 #include <sys/kauth.h> 80 81 #include <net/if.h> 82 #include <net/route.h> 83 84 #include <netinet/in.h> 85 #include <netinet/in_var.h> 86 #include <netinet/ip_var.h> 87 #include <netinet6/in6_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet/icmp6.h> 90 #include <netinet6/ip6_var.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet6/nd6.h> 93 94 #if IPSEC 95 #include <netinet6/ipsec.h> 96 #if INET6 97 #include <netinet6/ipsec6.h> 98 #endif 99 #include <netkey/key.h> 100 extern int ipsec_bypass; 101 extern lck_mtx_t *sadb_mutex; 102 extern lck_mtx_t *nd6_mutex; 103 #endif /* IPSEC */ 104 105 #include <netinet6/ip6_fw.h> 106 107 #include <net/net_osdep.h> 108 109 #include <netinet/kpi_ipfilter_var.h> 110 111 #ifndef __APPLE__ 112 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 113 #endif 114 115 116 extern u_long route_generation; 117 118 struct ip6_exthdrs { 119 struct mbuf *ip6e_ip6; 120 struct mbuf *ip6e_hbh; 121 struct mbuf *ip6e_dest1; 122 struct mbuf *ip6e_rthdr; 123 struct mbuf *ip6e_dest2; 124 }; 125 126 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 127 struct socket *, struct sockopt *sopt); 128 static int ip6_setmoptions(int, struct inpcb *, struct mbuf *); 129 static int ip6_getmoptions(int, struct ip6_moptions *, struct mbuf **); 130 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 131 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 132 struct ip6_frag **); 133 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 134 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 135 136 extern int ip_createmoptions(struct ip_moptions **imop); 137 extern int ip_addmembership(struct ip_moptions *imo, struct ip_mreq *mreq); 138 extern int ip_dropmembership(struct ip_moptions *imo, struct ip_mreq *mreq); 139 extern lck_mtx_t *ip6_mutex; 140 141 /* 142 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 143 * header (with pri, len, nxt, hlim, src, dst). 144 * This function may modify ver and hlim only. 145 * The mbuf chain containing the packet will be freed. 146 * The mbuf opt, if present, will not be freed. 147 * 148 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 149 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 150 * which is rt_rmx.rmx_mtu. 151 */ 152 int 153 ip6_output( 154 struct mbuf *m0, 155 struct ip6_pktopts *opt, 156 struct route_in6 *ro, 157 int flags, 158 struct ip6_moptions *im6o, 159 struct ifnet **ifpp, /* XXX: just for statistics */ 160 int locked) 161 { 162 struct ip6_hdr *ip6, *mhip6; 163 struct ifnet *ifp, *origifp; 164 struct mbuf *m = m0; 165 int hlen, tlen, len, off; 166 struct route_in6 ip6route; 167 struct sockaddr_in6 *dst; 168 int error = 0; 169 struct in6_ifaddr *ia = NULL; 170 u_long mtu; 171 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 172 struct ip6_exthdrs exthdrs; 173 struct in6_addr finaldst; 174 struct route_in6 *ro_pmtu = NULL; 175 int hdrsplit = 0; 176 int needipsec = 0; 177 ipfilter_t inject_filter_ref; 178 179 #if IPSEC 180 int needipsectun = 0; 181 struct socket *so = NULL; 182 struct secpolicy *sp = NULL; 183 184 if (!locked) 185 lck_mtx_lock(ip6_mutex); 186 /* for AH processing. stupid to have "socket" variable in IP layer... */ 187 if (ipsec_bypass == 0) 188 { 189 so = ipsec_getsocket(m); 190 (void)ipsec_setsocket(m, NULL); 191 } 192 #endif /* IPSEC */ 193 194 ip6 = mtod(m, struct ip6_hdr *); 195 inject_filter_ref = ipf_get_inject_filter(m); 196 197 #define MAKE_EXTHDR(hp, mp) \ 198 do { \ 199 if (hp) { \ 200 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 201 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 202 ((eh)->ip6e_len + 1) << 3); \ 203 if (error) \ 204 goto freehdrs; \ 205 } \ 206 } while (0) 207 208 bzero(&exthdrs, sizeof(exthdrs)); 209 210 if (opt) { 211 /* Hop-by-Hop options header */ 212 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 213 /* Destination options header(1st part) */ 214 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 215 /* Routing header */ 216 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 217 /* Destination options header(2nd part) */ 218 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 219 } 220 221 #if IPSEC 222 if (ipsec_bypass != 0) 223 goto skip_ipsec; 224 225 lck_mtx_lock(sadb_mutex); 226 /* get a security policy for this packet */ 227 if (so == NULL) 228 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 229 else 230 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 231 232 if (sp == NULL) { 233 ipsec6stat.out_inval++; 234 lck_mtx_unlock(sadb_mutex); 235 goto freehdrs; 236 } 237 238 error = 0; 239 240 /* check policy */ 241 switch (sp->policy) { 242 case IPSEC_POLICY_DISCARD: 243 /* 244 * This packet is just discarded. 245 */ 246 ipsec6stat.out_polvio++; 247 lck_mtx_unlock(sadb_mutex); 248 goto freehdrs; 249 250 case IPSEC_POLICY_BYPASS: 251 case IPSEC_POLICY_NONE: 252 /* no need to do IPsec. */ 253 needipsec = 0; 254 break; 255 256 case IPSEC_POLICY_IPSEC: 257 if (sp->req == NULL) { 258 /* acquire a policy */ 259 error = key_spdacquire(sp); 260 lck_mtx_unlock(sadb_mutex); 261 goto freehdrs; 262 } 263 needipsec = 1; 264 break; 265 266 case IPSEC_POLICY_ENTRUST: 267 default: 268 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 269 } 270 lck_mtx_unlock(sadb_mutex); 271 skip_ipsec: 272 #endif /* IPSEC */ 273 274 /* 275 * Calculate the total length of the extension header chain. 276 * Keep the length of the unfragmentable part for fragmentation. 277 */ 278 optlen = 0; 279 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 280 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 281 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 282 unfragpartlen = optlen + sizeof(struct ip6_hdr); 283 /* NOTE: we don't add AH/ESP length here. do that later. */ 284 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 285 286 /* 287 * If we need IPsec, or there is at least one extension header, 288 * separate IP6 header from the payload. 289 */ 290 if ((needipsec || optlen) && !hdrsplit) { 291 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 292 m = NULL; 293 goto freehdrs; 294 } 295 m = exthdrs.ip6e_ip6; 296 hdrsplit++; 297 } 298 299 /* adjust pointer */ 300 ip6 = mtod(m, struct ip6_hdr *); 301 302 /* adjust mbuf packet header length */ 303 m->m_pkthdr.len += optlen; 304 plen = m->m_pkthdr.len - sizeof(*ip6); 305 306 /* If this is a jumbo payload, insert a jumbo payload option. */ 307 if (plen > IPV6_MAXPACKET) { 308 if (!hdrsplit) { 309 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 310 m = NULL; 311 goto freehdrs; 312 } 313 m = exthdrs.ip6e_ip6; 314 hdrsplit++; 315 } 316 /* adjust pointer */ 317 ip6 = mtod(m, struct ip6_hdr *); 318 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 319 goto freehdrs; 320 ip6->ip6_plen = 0; 321 } else 322 ip6->ip6_plen = htons(plen); 323 324 /* 325 * Concatenate headers and fill in next header fields. 326 * Here we have, on "m" 327 * IPv6 payload 328 * and we insert headers accordingly. Finally, we should be getting: 329 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 330 * 331 * during the header composing process, "m" points to IPv6 header. 332 * "mprev" points to an extension header prior to esp. 333 */ 334 { 335 u_char *nexthdrp = &ip6->ip6_nxt; 336 struct mbuf *mprev = m; 337 338 /* 339 * we treat dest2 specially. this makes IPsec processing 340 * much easier. the goal here is to make mprev point the 341 * mbuf prior to dest2. 342 * 343 * result: IPv6 dest2 payload 344 * m and mprev will point to IPv6 header. 345 */ 346 if (exthdrs.ip6e_dest2) { 347 if (!hdrsplit) 348 panic("assumption failed: hdr not split"); 349 exthdrs.ip6e_dest2->m_next = m->m_next; 350 m->m_next = exthdrs.ip6e_dest2; 351 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 352 ip6->ip6_nxt = IPPROTO_DSTOPTS; 353 } 354 355 #define MAKE_CHAIN(m, mp, p, i)\ 356 do {\ 357 if (m) {\ 358 if (!hdrsplit) \ 359 panic("assumption failed: hdr not split"); \ 360 *mtod((m), u_char *) = *(p);\ 361 *(p) = (i);\ 362 p = mtod((m), u_char *);\ 363 (m)->m_next = (mp)->m_next;\ 364 (mp)->m_next = (m);\ 365 (mp) = (m);\ 366 }\ 367 } while (0) 368 /* 369 * result: IPv6 hbh dest1 rthdr dest2 payload 370 * m will point to IPv6 header. mprev will point to the 371 * extension header prior to dest2 (rthdr in the above case). 372 */ 373 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 374 nexthdrp, IPPROTO_HOPOPTS); 375 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 376 nexthdrp, IPPROTO_DSTOPTS); 377 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 378 nexthdrp, IPPROTO_ROUTING); 379 380 if (!TAILQ_EMPTY(&ipv6_filters)) { 381 struct ipfilter *filter; 382 int seen = (inject_filter_ref == 0); 383 int fixscope = 0; 384 struct ipf_pktopts *ippo = 0, ipf_pktopts; 385 386 if (im6o != NULL && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 387 ippo = &ipf_pktopts; 388 ippo->ippo_flags = IPPOF_MCAST_OPTS; 389 ippo->ippo_mcast_ifnet = im6o->im6o_multicast_ifp; 390 ippo->ippo_mcast_ttl = im6o->im6o_multicast_hlim; 391 ippo->ippo_mcast_loop = im6o->im6o_multicast_loop; 392 } 393 394 /* Hack: embed the scope_id in the destination */ 395 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) && 396 (ip6->ip6_dst.s6_addr16[1] == 0) && (ro != NULL)) { 397 fixscope = 1; 398 ip6->ip6_dst.s6_addr16[1] = htons(ro->ro_dst.sin6_scope_id); 399 } 400 { 401 lck_mtx_unlock(ip6_mutex); 402 ipf_ref(); 403 TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) { 404 /* 405 * No need to proccess packet twice if we've 406 * already seen it 407 */ 408 if (seen == 0) { 409 if ((struct ipfilter *)inject_filter_ref == filter) 410 seen = 1; 411 } else if (filter->ipf_filter.ipf_output) { 412 errno_t result; 413 414 result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, ippo); 415 if (result == EJUSTRETURN) { 416 ipf_unref(); 417 locked = 1; /* Don't want to take lock to unlock it right away */ 418 goto done; 419 } 420 if (result != 0) { 421 ipf_unref(); 422 locked = 1; /* Don't want to take lock to unlock it right away */ 423 goto bad; 424 } 425 } 426 } 427 ipf_unref(); 428 lck_mtx_lock(ip6_mutex); 429 } 430 /* Hack: cleanup embedded scope_id if we put it there */ 431 if (fixscope) 432 ip6->ip6_dst.s6_addr16[1] = 0; 433 } 434 435 #if IPSEC 436 if (!needipsec) 437 goto skip_ipsec2; 438 439 /* 440 * pointers after IPsec headers are not valid any more. 441 * other pointers need a great care too. 442 * (IPsec routines should not mangle mbufs prior to AH/ESP) 443 */ 444 exthdrs.ip6e_dest2 = NULL; 445 446 { 447 struct ip6_rthdr *rh = NULL; 448 int segleft_org = 0; 449 struct ipsec_output_state state; 450 451 if (exthdrs.ip6e_rthdr) { 452 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 453 segleft_org = rh->ip6r_segleft; 454 rh->ip6r_segleft = 0; 455 } 456 457 bzero(&state, sizeof(state)); 458 state.m = m; 459 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 460 &needipsectun); 461 m = state.m; 462 if (error) { 463 /* mbuf is already reclaimed in ipsec6_output_trans. */ 464 m = NULL; 465 switch (error) { 466 case EHOSTUNREACH: 467 case ENETUNREACH: 468 case EMSGSIZE: 469 case ENOBUFS: 470 case ENOMEM: 471 break; 472 default: 473 printf("ip6_output (ipsec): error code %d\n", error); 474 /* fall through */ 475 case ENOENT: 476 /* don't show these error codes to the user */ 477 error = 0; 478 break; 479 } 480 goto bad; 481 } 482 if (exthdrs.ip6e_rthdr) { 483 /* ah6_output doesn't modify mbuf chain */ 484 rh->ip6r_segleft = segleft_org; 485 } 486 } 487 skip_ipsec2:; 488 #endif 489 } 490 491 /* 492 * If there is a routing header, replace destination address field 493 * with the first hop of the routing header. 494 */ 495 if (exthdrs.ip6e_rthdr) { 496 struct ip6_rthdr *rh = 497 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 498 struct ip6_rthdr *)); 499 struct ip6_rthdr0 *rh0; 500 501 finaldst = ip6->ip6_dst; 502 switch (rh->ip6r_type) { 503 case IPV6_RTHDR_TYPE_0: 504 rh0 = (struct ip6_rthdr0 *)rh; 505 ip6->ip6_dst = rh0->ip6r0_addr[0]; 506 bcopy((caddr_t)&rh0->ip6r0_addr[1], 507 (caddr_t)&rh0->ip6r0_addr[0], 508 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 509 ); 510 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 511 break; 512 default: /* is it possible? */ 513 error = EINVAL; 514 goto bad; 515 } 516 } 517 518 /* Source address validation */ 519 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 520 (flags & IPV6_DADOUTPUT) == 0) { 521 error = EOPNOTSUPP; 522 ip6stat.ip6s_badscope++; 523 goto bad; 524 } 525 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 526 error = EOPNOTSUPP; 527 ip6stat.ip6s_badscope++; 528 goto bad; 529 } 530 531 ip6stat.ip6s_localout++; 532 533 /* 534 * Route packet. 535 */ 536 if (ro == 0) { 537 ro = &ip6route; 538 bzero((caddr_t)ro, sizeof(*ro)); 539 } 540 ro_pmtu = ro; 541 if (opt && opt->ip6po_rthdr) 542 ro = &opt->ip6po_route; 543 dst = (struct sockaddr_in6 *)&ro->ro_dst; 544 /* 545 * If there is a cached route, 546 * check that it is to the same destination 547 * and is still up. If not, free it and try again. 548 */ 549 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 550 dst->sin6_family != AF_INET6 || 551 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst) || 552 ro->ro_rt->generation_id != route_generation)) { 553 rtfree(ro->ro_rt); 554 ro->ro_rt = (struct rtentry *)0; 555 } 556 if (ro->ro_rt == 0) { 557 bzero(dst, sizeof(*dst)); 558 dst->sin6_family = AF_INET6; 559 dst->sin6_len = sizeof(struct sockaddr_in6); 560 dst->sin6_addr = ip6->ip6_dst; 561 #if SCOPEDROUTING 562 /* XXX: sin6_scope_id should already be fixed at this point */ 563 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 564 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 565 #endif 566 } 567 #if IPSEC 568 if (needipsec && needipsectun) { 569 struct ipsec_output_state state; 570 571 /* 572 * All the extension headers will become inaccessible 573 * (since they can be encrypted). 574 * Don't panic, we need no more updates to extension headers 575 * on inner IPv6 packet (since they are now encapsulated). 576 * 577 * IPv6 [ESP|AH] IPv6 [extension headers] payload 578 */ 579 bzero(&exthdrs, sizeof(exthdrs)); 580 exthdrs.ip6e_ip6 = m; 581 582 bzero(&state, sizeof(state)); 583 state.m = m; 584 state.ro = (struct route *)ro; 585 state.dst = (struct sockaddr *)dst; 586 587 lck_mtx_lock(sadb_mutex); 588 error = ipsec6_output_tunnel(&state, sp, flags); 589 lck_mtx_unlock(sadb_mutex); 590 m = state.m; 591 ro = (struct route_in6 *)state.ro; 592 dst = (struct sockaddr_in6 *)state.dst; 593 if (error) { 594 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 595 m0 = m = NULL; 596 m = NULL; 597 switch (error) { 598 case EHOSTUNREACH: 599 case ENETUNREACH: 600 case EMSGSIZE: 601 case ENOBUFS: 602 case ENOMEM: 603 break; 604 default: 605 printf("ip6_output (ipsec): error code %d\n", error); 606 /* fall through */ 607 case ENOENT: 608 /* don't show these error codes to the user */ 609 error = 0; 610 break; 611 } 612 lck_mtx_unlock(sadb_mutex); 613 goto bad; 614 } 615 616 exthdrs.ip6e_ip6 = m; 617 } 618 #endif /* IPSEC */ 619 620 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 621 /* Unicast */ 622 623 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 624 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 625 /* xxx 626 * interface selection comes here 627 * if an interface is specified from an upper layer, 628 * ifp must point it. 629 */ 630 lck_mtx_lock(rt_mtx); 631 if (ro->ro_rt == 0) { 632 /* 633 * non-bsdi always clone routes, if parent is 634 * PRF_CLONING. 635 */ 636 rtalloc_ign_locked((struct route *)ro, 0UL); 637 } 638 if (ro->ro_rt == 0) { 639 ip6stat.ip6s_noroute++; 640 error = EHOSTUNREACH; 641 lck_mtx_unlock(rt_mtx); 642 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 643 goto bad; 644 } 645 ia = ifatoia6(ro->ro_rt->rt_ifa); 646 ifp = ro->ro_rt->rt_ifp; 647 ro->ro_rt->rt_use++; 648 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 649 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 650 lck_mtx_unlock(rt_mtx); 651 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 652 653 in6_ifstat_inc(ifp, ifs6_out_request); 654 655 /* 656 * Check if the outgoing interface conflicts with 657 * the interface specified by ifi6_ifindex (if specified). 658 * Note that loopback interface is always okay. 659 * (this may happen when we are sending a packet to one of 660 * our own addresses.) 661 */ 662 if (opt && opt->ip6po_pktinfo 663 && opt->ip6po_pktinfo->ipi6_ifindex) { 664 if (!(ifp->if_flags & IFF_LOOPBACK) 665 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 666 ip6stat.ip6s_noroute++; 667 in6_ifstat_inc(ifp, ifs6_out_discard); 668 error = EHOSTUNREACH; 669 goto bad; 670 } 671 } 672 673 if (opt && opt->ip6po_hlim != -1) 674 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 675 } else { 676 /* Multicast */ 677 struct in6_multi *in6m; 678 679 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 680 681 /* 682 * See if the caller provided any multicast options 683 */ 684 ifp = NULL; 685 if (im6o != NULL) { 686 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 687 if (im6o->im6o_multicast_ifp != NULL) 688 ifp = im6o->im6o_multicast_ifp; 689 } else 690 ip6->ip6_hlim = ip6_defmcasthlim; 691 692 /* 693 * See if the caller provided the outgoing interface 694 * as an ancillary data. 695 * Boundary check for ifindex is assumed to be already done. 696 */ 697 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 698 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 699 700 /* 701 * If the destination is a node-local scope multicast, 702 * the packet should be loop-backed only. 703 */ 704 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 705 /* 706 * If the outgoing interface is already specified, 707 * it should be a loopback interface. 708 */ 709 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 710 ip6stat.ip6s_badscope++; 711 error = ENETUNREACH; /* XXX: better error? */ 712 /* XXX correct ifp? */ 713 in6_ifstat_inc(ifp, ifs6_out_discard); 714 goto bad; 715 } else { 716 ifp = &loif[0]; 717 } 718 } 719 720 if (opt && opt->ip6po_hlim != -1) 721 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 722 723 /* 724 * If caller did not provide an interface lookup a 725 * default in the routing table. This is either a 726 * default for the speicfied group (i.e. a host 727 * route), or a multicast default (a route for the 728 * ``net'' ff00::/8). 729 */ 730 if (ifp == NULL) { 731 lck_mtx_lock(rt_mtx); 732 if (ro->ro_rt == 0) { 733 ro->ro_rt = rtalloc1_locked((struct sockaddr *) 734 &ro->ro_dst, 0, 0UL); 735 } 736 if (ro->ro_rt == 0) { 737 ip6stat.ip6s_noroute++; 738 lck_mtx_unlock(rt_mtx); 739 error = EHOSTUNREACH; 740 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 741 goto bad; 742 } 743 ia = ifatoia6(ro->ro_rt->rt_ifa); 744 ifp = ro->ro_rt->rt_ifp; 745 ro->ro_rt->rt_use++; 746 lck_mtx_unlock(rt_mtx); 747 } 748 749 if ((flags & IPV6_FORWARDING) == 0) 750 in6_ifstat_inc(ifp, ifs6_out_request); 751 in6_ifstat_inc(ifp, ifs6_out_mcast); 752 753 /* 754 * Confirm that the outgoing interface supports multicast. 755 */ 756 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 757 ip6stat.ip6s_noroute++; 758 in6_ifstat_inc(ifp, ifs6_out_discard); 759 error = ENETUNREACH; 760 goto bad; 761 } 762 ifnet_lock_shared(ifp); 763 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 764 ifnet_lock_done(ifp); 765 if (in6m != NULL && 766 (im6o == NULL || im6o->im6o_multicast_loop)) { 767 /* 768 * If we belong to the destination multicast group 769 * on the outgoing interface, and the caller did not 770 * forbid loopback, loop back a copy. 771 */ 772 ip6_mloopback(ifp, m, dst); 773 } else { 774 /* 775 * If we are acting as a multicast router, perform 776 * multicast forwarding as if the packet had just 777 * arrived on the interface to which we are about 778 * to send. The multicast forwarding function 779 * recursively calls this function, using the 780 * IPV6_FORWARDING flag to prevent infinite recursion. 781 * 782 * Multicasts that are looped back by ip6_mloopback(), 783 * above, will be forwarded by the ip6_input() routine, 784 * if necessary. 785 */ 786 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 787 if (ip6_mforward(ip6, ifp, m) != NULL) { 788 m_freem(m); 789 goto done; 790 } 791 } 792 } 793 /* 794 * Multicasts with a hoplimit of zero may be looped back, 795 * above, but must not be transmitted on a network. 796 * Also, multicasts addressed to the loopback interface 797 * are not sent -- the above call to ip6_mloopback() will 798 * loop back a copy if this host actually belongs to the 799 * destination group on the loopback interface. 800 */ 801 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 802 m_freem(m); 803 goto done; 804 } 805 } 806 807 /* 808 * Fill the outgoing inteface to tell the upper layer 809 * to increment per-interface statistics. 810 */ 811 if (ifpp) 812 *ifpp = ifp; 813 814 /* 815 * Determine path MTU. 816 */ 817 if (ro_pmtu != ro) { 818 /* The first hop and the final destination may differ. */ 819 struct sockaddr_in6 *sin6_fin = 820 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 821 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 822 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 823 &finaldst))) { 824 rtfree(ro_pmtu->ro_rt); 825 ro_pmtu->ro_rt = (struct rtentry *)0; 826 } 827 if (ro_pmtu->ro_rt == 0) { 828 bzero(sin6_fin, sizeof(*sin6_fin)); 829 sin6_fin->sin6_family = AF_INET6; 830 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 831 sin6_fin->sin6_addr = finaldst; 832 833 rtalloc((struct route *)ro_pmtu); 834 } 835 } 836 if (ro_pmtu->ro_rt != NULL) { 837 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 838 839 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 840 if (mtu > ifmtu || mtu == 0) { 841 /* 842 * The MTU on the route is larger than the MTU on 843 * the interface! This shouldn't happen, unless the 844 * MTU of the interface has been changed after the 845 * interface was brought up. Change the MTU in the 846 * route to match the interface MTU (as long as the 847 * field isn't locked). 848 * 849 * if MTU on the route is 0, we need to fix the MTU. 850 * this case happens with path MTU discovery timeouts. 851 */ 852 mtu = ifmtu; 853 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 854 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 855 } 856 } else { 857 mtu = nd_ifinfo[ifp->if_index].linkmtu; 858 } 859 860 /* 861 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 862 */ 863 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 864 mtu = IPV6_MMTU; 865 866 /* Fake scoped addresses */ 867 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 868 /* 869 * If source or destination address is a scoped address, and 870 * the packet is going to be sent to a loopback interface, 871 * we should keep the original interface. 872 */ 873 874 /* 875 * XXX: this is a very experimental and temporary solution. 876 * We eventually have sockaddr_in6 and use the sin6_scope_id 877 * field of the structure here. 878 * We rely on the consistency between two scope zone ids 879 * of source and destination, which should already be assured. 880 * Larger scopes than link will be supported in the future. 881 */ 882 origifp = NULL; 883 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 884 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 885 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 886 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 887 /* 888 * XXX: origifp can be NULL even in those two cases above. 889 * For example, if we remove the (only) link-local address 890 * from the loopback interface, and try to send a link-local 891 * address without link-id information. Then the source 892 * address is ::1, and the destination address is the 893 * link-local address with its s6_addr16[1] being zero. 894 * What is worse, if the packet goes to the loopback interface 895 * by a default rejected route, the null pointer would be 896 * passed to looutput, and the kernel would hang. 897 * The following last resort would prevent such disaster. 898 */ 899 if (origifp == NULL) 900 origifp = ifp; 901 } 902 else 903 origifp = ifp; 904 #ifndef SCOPEDROUTING 905 /* 906 * clear embedded scope identifiers if necessary. 907 * in6_clearscope will touch the addresses only when necessary. 908 */ 909 in6_clearscope(&ip6->ip6_src); 910 in6_clearscope(&ip6->ip6_dst); 911 #endif 912 913 /* 914 * Check with the firewall... 915 */ 916 if (ip6_fw_enable && ip6_fw_chk_ptr) { 917 u_short port = 0; 918 m->m_pkthdr.rcvif = NULL; /* XXX */ 919 /* If ipfw says divert, we have to just drop packet */ 920 if (ip6_fw_chk_ptr(&ip6, ifp, &port, &m)) { 921 m_freem(m); 922 goto done; 923 } 924 if (!m) { 925 error = EACCES; 926 goto done; 927 } 928 } 929 930 /* 931 * If the outgoing packet contains a hop-by-hop options header, 932 * it must be examined and processed even by the source node. 933 * (RFC 2460, section 4.) 934 */ 935 if (exthdrs.ip6e_hbh) { 936 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 937 u_int32_t dummy1; /* XXX unused */ 938 u_int32_t dummy2; /* XXX unused */ 939 940 #if DIAGNOSTIC 941 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 942 panic("ip6e_hbh is not continuous"); 943 #endif 944 /* 945 * XXX: if we have to send an ICMPv6 error to the sender, 946 * we need the M_LOOP flag since icmp6_error() expects 947 * the IPv6 and the hop-by-hop options header are 948 * continuous unless the flag is set. 949 */ 950 m->m_flags |= M_LOOP; 951 m->m_pkthdr.rcvif = ifp; 952 if (ip6_process_hopopts(m, 953 (u_int8_t *)(hbh + 1), 954 ((hbh->ip6h_len + 1) << 3) - 955 sizeof(struct ip6_hbh), 956 &dummy1, &dummy2) < 0) { 957 /* m was already freed at this point */ 958 error = EINVAL;/* better error? */ 959 goto done; 960 } 961 m->m_flags &= ~M_LOOP; /* XXX */ 962 m->m_pkthdr.rcvif = NULL; 963 } 964 965 /* 966 * Send the packet to the outgoing interface. 967 * If necessary, do IPv6 fragmentation before sending. 968 */ 969 tlen = m->m_pkthdr.len; 970 if (tlen <= mtu 971 #if notyet 972 /* 973 * On any link that cannot convey a 1280-octet packet in one piece, 974 * link-specific fragmentation and reassembly must be provided at 975 * a layer below IPv6. [RFC 2460, sec.5] 976 * Thus if the interface has ability of link-level fragmentation, 977 * we can just send the packet even if the packet size is 978 * larger than the link's MTU. 979 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 980 */ 981 982 || ifp->if_flags & IFF_FRAGMENTABLE 983 #endif 984 ) 985 { 986 /* Record statistics for this interface address. */ 987 if (ia && !(flags & IPV6_FORWARDING)) { 988 #ifndef __APPLE__ 989 ia->ia_ifa.if_opackets++; 990 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 991 #endif 992 } 993 #ifdef IPSEC 994 /* clean ipsec history once it goes out of the node */ 995 ipsec_delaux(m); 996 #endif 997 998 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt, 1); 999 goto done; 1000 } else if (mtu < IPV6_MMTU) { 1001 /* 1002 * note that path MTU is never less than IPV6_MMTU 1003 * (see icmp6_input). 1004 */ 1005 error = EMSGSIZE; 1006 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1007 goto bad; 1008 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 1009 error = EMSGSIZE; 1010 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1011 goto bad; 1012 } else { 1013 struct mbuf **mnext, *m_frgpart; 1014 struct ip6_frag *ip6f; 1015 u_int32_t id = htonl(ip6_id++); 1016 u_char nextproto; 1017 1018 /* 1019 * Too large for the destination or interface; 1020 * fragment if possible. 1021 * Must be able to put at least 8 bytes per fragment. 1022 */ 1023 hlen = unfragpartlen; 1024 if (mtu > IPV6_MAXPACKET) 1025 mtu = IPV6_MAXPACKET; 1026 1027 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1028 if (len < 8) { 1029 error = EMSGSIZE; 1030 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1031 goto bad; 1032 } 1033 1034 mnext = &m->m_nextpkt; 1035 1036 /* 1037 * Change the next header field of the last header in the 1038 * unfragmentable part. 1039 */ 1040 if (exthdrs.ip6e_rthdr) { 1041 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1042 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1043 } else if (exthdrs.ip6e_dest1) { 1044 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1045 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1046 } else if (exthdrs.ip6e_hbh) { 1047 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1048 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1049 } else { 1050 nextproto = ip6->ip6_nxt; 1051 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1052 } 1053 1054 /* 1055 * Loop through length of segment after first fragment, 1056 * make new header and copy data of each part and link onto 1057 * chain. 1058 */ 1059 m0 = m; 1060 for (off = hlen; off < tlen; off += len) { 1061 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1062 if (!m) { 1063 error = ENOBUFS; 1064 ip6stat.ip6s_odropped++; 1065 goto sendorfree; 1066 } 1067 m->m_pkthdr.rcvif = NULL; 1068 m->m_flags = m0->m_flags & M_COPYFLAGS; 1069 *mnext = m; 1070 mnext = &m->m_nextpkt; 1071 m->m_data += max_linkhdr; 1072 mhip6 = mtod(m, struct ip6_hdr *); 1073 *mhip6 = *ip6; 1074 m->m_len = sizeof(*mhip6); 1075 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1076 if (error) { 1077 ip6stat.ip6s_odropped++; 1078 goto sendorfree; 1079 } 1080 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1081 if (off + len >= tlen) 1082 len = tlen - off; 1083 else 1084 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1085 mhip6->ip6_plen = htons((u_short)(len + hlen + 1086 sizeof(*ip6f) - 1087 sizeof(struct ip6_hdr))); 1088 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1089 error = ENOBUFS; 1090 ip6stat.ip6s_odropped++; 1091 goto sendorfree; 1092 } 1093 m_cat(m, m_frgpart); 1094 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1095 m->m_pkthdr.rcvif = 0; 1096 m->m_pkthdr.socket_id = m0->m_pkthdr.socket_id; 1097 ip6f->ip6f_reserved = 0; 1098 ip6f->ip6f_ident = id; 1099 ip6f->ip6f_nxt = nextproto; 1100 ip6stat.ip6s_ofragments++; 1101 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1102 } 1103 1104 in6_ifstat_inc(ifp, ifs6_out_fragok); 1105 } 1106 1107 /* 1108 * Remove leading garbages. 1109 */ 1110 sendorfree: 1111 m = m0->m_nextpkt; 1112 m0->m_nextpkt = 0; 1113 m_freem(m0); 1114 for (m0 = m; m; m = m0) { 1115 m0 = m->m_nextpkt; 1116 m->m_nextpkt = 0; 1117 if (error == 0) { 1118 /* Record statistics for this interface address. */ 1119 if (ia) { 1120 #ifndef __APPLE__ 1121 ia->ia_ifa.if_opackets++; 1122 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1123 #endif 1124 } 1125 #if IPSEC 1126 /* clean ipsec history once it goes out of the node */ 1127 ipsec_delaux(m); 1128 #endif 1129 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt, 1); 1130 1131 } else 1132 m_freem(m); 1133 } 1134 1135 if (error == 0) 1136 ip6stat.ip6s_fragmented++; 1137 1138 done: 1139 if (!locked) 1140 lck_mtx_unlock(ip6_mutex); 1141 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for rtfree */ 1142 rtfree(ro->ro_rt); 1143 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1144 rtfree(ro_pmtu->ro_rt); 1145 } 1146 1147 #if IPSEC 1148 if (sp != NULL) { 1149 lck_mtx_lock(sadb_mutex); 1150 key_freesp(sp); 1151 lck_mtx_unlock(sadb_mutex); 1152 } 1153 #endif /* IPSEC */ 1154 1155 return(error); 1156 1157 freehdrs: 1158 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1159 m_freem(exthdrs.ip6e_dest1); 1160 m_freem(exthdrs.ip6e_rthdr); 1161 m_freem(exthdrs.ip6e_dest2); 1162 /* fall through */ 1163 bad: 1164 m_freem(m); 1165 goto done; 1166 } 1167 1168 static int 1169 ip6_copyexthdr(mp, hdr, hlen) 1170 struct mbuf **mp; 1171 caddr_t hdr; 1172 int hlen; 1173 { 1174 struct mbuf *m; 1175 1176 if (hlen > MCLBYTES) 1177 return(ENOBUFS); /* XXX */ 1178 1179 MGET(m, M_DONTWAIT, MT_DATA); 1180 if (!m) 1181 return(ENOBUFS); 1182 1183 if (hlen > MLEN) { 1184 MCLGET(m, M_DONTWAIT); 1185 if ((m->m_flags & M_EXT) == 0) { 1186 m_free(m); 1187 return(ENOBUFS); 1188 } 1189 } 1190 m->m_len = hlen; 1191 if (hdr) 1192 bcopy(hdr, mtod(m, caddr_t), hlen); 1193 1194 *mp = m; 1195 return(0); 1196 } 1197 1198 /* 1199 * Insert jumbo payload option. 1200 */ 1201 static int 1202 ip6_insert_jumboopt(exthdrs, plen) 1203 struct ip6_exthdrs *exthdrs; 1204 u_int32_t plen; 1205 { 1206 struct mbuf *mopt; 1207 u_char *optbuf; 1208 u_int32_t v; 1209 1210 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1211 1212 /* 1213 * If there is no hop-by-hop options header, allocate new one. 1214 * If there is one but it doesn't have enough space to store the 1215 * jumbo payload option, allocate a cluster to store the whole options. 1216 * Otherwise, use it to store the options. 1217 */ 1218 if (exthdrs->ip6e_hbh == 0) { 1219 MGET(mopt, M_DONTWAIT, MT_DATA); 1220 if (mopt == 0) 1221 return(ENOBUFS); 1222 mopt->m_len = JUMBOOPTLEN; 1223 optbuf = mtod(mopt, u_char *); 1224 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1225 exthdrs->ip6e_hbh = mopt; 1226 } else { 1227 struct ip6_hbh *hbh; 1228 1229 mopt = exthdrs->ip6e_hbh; 1230 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1231 /* 1232 * XXX assumption: 1233 * - exthdrs->ip6e_hbh is not referenced from places 1234 * other than exthdrs. 1235 * - exthdrs->ip6e_hbh is not an mbuf chain. 1236 */ 1237 int oldoptlen = mopt->m_len; 1238 struct mbuf *n; 1239 1240 /* 1241 * XXX: give up if the whole (new) hbh header does 1242 * not fit even in an mbuf cluster. 1243 */ 1244 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1245 return(ENOBUFS); 1246 1247 /* 1248 * As a consequence, we must always prepare a cluster 1249 * at this point. 1250 */ 1251 MGET(n, M_DONTWAIT, MT_DATA); 1252 if (n) { 1253 MCLGET(n, M_DONTWAIT); 1254 if ((n->m_flags & M_EXT) == 0) { 1255 m_freem(n); 1256 n = NULL; 1257 } 1258 } 1259 if (!n) 1260 return(ENOBUFS); 1261 n->m_len = oldoptlen + JUMBOOPTLEN; 1262 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1263 oldoptlen); 1264 optbuf = mtod(n, caddr_t) + oldoptlen; 1265 m_freem(mopt); 1266 mopt = exthdrs->ip6e_hbh = n; 1267 } else { 1268 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1269 mopt->m_len += JUMBOOPTLEN; 1270 } 1271 optbuf[0] = IP6OPT_PADN; 1272 optbuf[1] = 1; 1273 1274 /* 1275 * Adjust the header length according to the pad and 1276 * the jumbo payload option. 1277 */ 1278 hbh = mtod(mopt, struct ip6_hbh *); 1279 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1280 } 1281 1282 /* fill in the option. */ 1283 optbuf[2] = IP6OPT_JUMBO; 1284 optbuf[3] = 4; 1285 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1286 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1287 1288 /* finally, adjust the packet header length */ 1289 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1290 1291 return(0); 1292 #undef JUMBOOPTLEN 1293 } 1294 1295 /* 1296 * Insert fragment header and copy unfragmentable header portions. 1297 */ 1298 static int 1299 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1300 struct mbuf *m0, *m; 1301 int hlen; 1302 struct ip6_frag **frghdrp; 1303 { 1304 struct mbuf *n, *mlast; 1305 1306 if (hlen > sizeof(struct ip6_hdr)) { 1307 n = m_copym(m0, sizeof(struct ip6_hdr), 1308 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1309 if (n == 0) 1310 return(ENOBUFS); 1311 m->m_next = n; 1312 } else 1313 n = m; 1314 1315 /* Search for the last mbuf of unfragmentable part. */ 1316 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1317 ; 1318 1319 if ((mlast->m_flags & M_EXT) == 0 && 1320 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1321 /* use the trailing space of the last mbuf for the fragment hdr */ 1322 *frghdrp = 1323 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1324 mlast->m_len += sizeof(struct ip6_frag); 1325 m->m_pkthdr.len += sizeof(struct ip6_frag); 1326 } else { 1327 /* allocate a new mbuf for the fragment header */ 1328 struct mbuf *mfrg; 1329 1330 MGET(mfrg, M_DONTWAIT, MT_DATA); 1331 if (mfrg == 0) 1332 return(ENOBUFS); 1333 mfrg->m_len = sizeof(struct ip6_frag); 1334 *frghdrp = mtod(mfrg, struct ip6_frag *); 1335 mlast->m_next = mfrg; 1336 } 1337 1338 return(0); 1339 } 1340 1341 extern int load_ipfw(); 1342 1343 /* 1344 * IP6 socket option processing. 1345 */ 1346 int 1347 ip6_ctloutput(so, sopt) 1348 struct socket *so; 1349 struct sockopt *sopt; 1350 { 1351 int privileged; 1352 struct inpcb *in6p = sotoinpcb(so); 1353 int error, optval; 1354 int level, op, optname; 1355 int optlen; 1356 struct proc *p; 1357 1358 level = error = optval = 0; 1359 if (sopt == NULL) 1360 panic("ip6_ctloutput: arg soopt is NULL"); 1361 else { 1362 level = sopt->sopt_level; 1363 op = sopt->sopt_dir; 1364 optname = sopt->sopt_name; 1365 optlen = sopt->sopt_valsize; 1366 p = sopt->sopt_p; 1367 } 1368 1369 privileged = (p == 0 || proc_suser(p)) ? 0 : 1; 1370 1371 if (level == IPPROTO_IPV6) { 1372 switch (op) { 1373 1374 case SOPT_SET: 1375 switch (optname) { 1376 case IPV6_PKTOPTIONS: 1377 { 1378 struct mbuf *m; 1379 1380 if (sopt->sopt_valsize > MCLBYTES) { 1381 error = EMSGSIZE; 1382 break; 1383 } 1384 error = soopt_getm(sopt, &m); /* XXX */ 1385 if (error != NULL) 1386 break; 1387 error = soopt_mcopyin(sopt, m); /* XXX */ 1388 if (error != NULL) 1389 break; 1390 error = ip6_pcbopts(&in6p->in6p_outputopts, 1391 m, so, sopt); 1392 m_freem(m); /* XXX */ 1393 break; 1394 } 1395 1396 /* 1397 * Use of some Hop-by-Hop options or some 1398 * Destination options, might require special 1399 * privilege. That is, normal applications 1400 * (without special privilege) might be forbidden 1401 * from setting certain options in outgoing packets, 1402 * and might never see certain options in received 1403 * packets. [RFC 2292 Section 6] 1404 * KAME specific note: 1405 * KAME prevents non-privileged users from sending or 1406 * receiving ANY hbh/dst options in order to avoid 1407 * overhead of parsing options in the kernel. 1408 */ 1409 case IPV6_UNICAST_HOPS: 1410 case IPV6_CHECKSUM: 1411 case IPV6_FAITH: 1412 1413 case IPV6_V6ONLY: 1414 if (optlen != sizeof(int)) { 1415 error = EINVAL; 1416 break; 1417 } 1418 error = sooptcopyin(sopt, &optval, 1419 sizeof optval, sizeof optval); 1420 if (error) 1421 break; 1422 switch (optname) { 1423 1424 case IPV6_UNICAST_HOPS: 1425 if (optval < -1 || optval >= 256) 1426 error = EINVAL; 1427 else { 1428 /* -1 = kernel default */ 1429 in6p->in6p_hops = optval; 1430 1431 if ((in6p->in6p_vflag & 1432 INP_IPV4) != 0) 1433 in6p->inp_ip_ttl = optval; 1434 } 1435 break; 1436 #define OPTSET(bit) \ 1437 do { \ 1438 if (optval) \ 1439 in6p->in6p_flags |= (bit); \ 1440 else \ 1441 in6p->in6p_flags &= ~(bit); \ 1442 } while (0) 1443 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1444 1445 case IPV6_CHECKSUM: 1446 in6p->in6p_cksum = optval; 1447 break; 1448 1449 case IPV6_FAITH: 1450 OPTSET(IN6P_FAITH); 1451 break; 1452 1453 case IPV6_V6ONLY: 1454 /* 1455 * make setsockopt(IPV6_V6ONLY) 1456 * available only prior to bind(2). 1457 * see ipng mailing list, Jun 22 2001. 1458 */ 1459 if (in6p->in6p_lport || 1460 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1461 { 1462 error = EINVAL; 1463 break; 1464 } 1465 OPTSET(IN6P_IPV6_V6ONLY); 1466 if (optval) 1467 in6p->in6p_vflag &= ~INP_IPV4; 1468 else 1469 in6p->in6p_vflag |= INP_IPV4; 1470 break; 1471 } 1472 break; 1473 1474 case IPV6_PKTINFO: 1475 case IPV6_HOPLIMIT: 1476 case IPV6_HOPOPTS: 1477 case IPV6_DSTOPTS: 1478 case IPV6_RTHDR: 1479 /* RFC 2292 */ 1480 if (optlen != sizeof(int)) { 1481 error = EINVAL; 1482 break; 1483 } 1484 error = sooptcopyin(sopt, &optval, 1485 sizeof optval, sizeof optval); 1486 if (error) 1487 break; 1488 switch (optname) { 1489 case IPV6_PKTINFO: 1490 OPTSET(IN6P_PKTINFO); 1491 break; 1492 case IPV6_HOPLIMIT: 1493 OPTSET(IN6P_HOPLIMIT); 1494 break; 1495 case IPV6_HOPOPTS: 1496 /* 1497 * Check super-user privilege. 1498 * See comments for IPV6_RECVHOPOPTS. 1499 */ 1500 if (!privileged) 1501 return(EPERM); 1502 OPTSET(IN6P_HOPOPTS); 1503 break; 1504 case IPV6_DSTOPTS: 1505 if (!privileged) 1506 return(EPERM); 1507 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1508 break; 1509 case IPV6_RTHDR: 1510 OPTSET(IN6P_RTHDR); 1511 break; 1512 } 1513 break; 1514 #undef OPTSET 1515 1516 case IPV6_MULTICAST_IF: 1517 case IPV6_MULTICAST_HOPS: 1518 case IPV6_MULTICAST_LOOP: 1519 case IPV6_JOIN_GROUP: 1520 case IPV6_LEAVE_GROUP: 1521 { 1522 struct mbuf *m; 1523 if (sopt->sopt_valsize > MLEN) { 1524 error = EMSGSIZE; 1525 break; 1526 } 1527 /* XXX */ 1528 MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); 1529 if (m == 0) { 1530 error = ENOBUFS; 1531 break; 1532 } 1533 m->m_len = sopt->sopt_valsize; 1534 error = sooptcopyin(sopt, mtod(m, char *), 1535 m->m_len, m->m_len); 1536 error = ip6_setmoptions(sopt->sopt_name, in6p, m); 1537 (void)m_free(m); 1538 } 1539 break; 1540 1541 case IPV6_PORTRANGE: 1542 error = sooptcopyin(sopt, &optval, 1543 sizeof optval, sizeof optval); 1544 if (error) 1545 break; 1546 1547 switch (optval) { 1548 case IPV6_PORTRANGE_DEFAULT: 1549 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1550 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1551 break; 1552 1553 case IPV6_PORTRANGE_HIGH: 1554 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1555 in6p->in6p_flags |= IN6P_HIGHPORT; 1556 break; 1557 1558 case IPV6_PORTRANGE_LOW: 1559 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1560 in6p->in6p_flags |= IN6P_LOWPORT; 1561 break; 1562 1563 default: 1564 error = EINVAL; 1565 break; 1566 } 1567 break; 1568 1569 #if IPSEC 1570 case IPV6_IPSEC_POLICY: 1571 { 1572 caddr_t req = NULL; 1573 size_t len = 0; 1574 struct mbuf *m; 1575 1576 if (sopt->sopt_valsize > MCLBYTES) { 1577 error = EMSGSIZE; 1578 break; 1579 } 1580 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1581 break; 1582 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1583 break; 1584 if (m) { 1585 req = mtod(m, caddr_t); 1586 len = m->m_len; 1587 } 1588 lck_mtx_lock(sadb_mutex); 1589 error = ipsec6_set_policy(in6p, optname, req, 1590 len, privileged); 1591 lck_mtx_unlock(sadb_mutex); 1592 m_freem(m); 1593 } 1594 break; 1595 #endif /* KAME IPSEC */ 1596 1597 case IPV6_FW_ADD: 1598 case IPV6_FW_DEL: 1599 case IPV6_FW_FLUSH: 1600 case IPV6_FW_ZERO: 1601 { 1602 if (ip6_fw_ctl_ptr == NULL && load_ipfw() != 0) 1603 return EINVAL; 1604 1605 error = (*ip6_fw_ctl_ptr)(sopt); 1606 } 1607 break; 1608 1609 default: 1610 error = ENOPROTOOPT; 1611 break; 1612 } 1613 break; 1614 1615 case SOPT_GET: 1616 switch (optname) { 1617 1618 case IPV6_PKTOPTIONS: 1619 if (in6p->in6p_options) { 1620 struct mbuf *m; 1621 m = m_copym(in6p->in6p_options, 1622 0, M_COPYALL, M_WAIT); 1623 error = soopt_mcopyout(sopt, m); 1624 if (error == 0) 1625 m_freem(m); 1626 } else 1627 sopt->sopt_valsize = 0; 1628 break; 1629 1630 case IPV6_UNICAST_HOPS: 1631 case IPV6_CHECKSUM: 1632 1633 case IPV6_FAITH: 1634 case IPV6_V6ONLY: 1635 case IPV6_PORTRANGE: 1636 switch (optname) { 1637 1638 case IPV6_UNICAST_HOPS: 1639 optval = in6p->in6p_hops; 1640 break; 1641 1642 case IPV6_CHECKSUM: 1643 optval = in6p->in6p_cksum; 1644 break; 1645 1646 case IPV6_FAITH: 1647 optval = OPTBIT(IN6P_FAITH); 1648 break; 1649 1650 case IPV6_V6ONLY: 1651 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1652 break; 1653 1654 case IPV6_PORTRANGE: 1655 { 1656 int flags; 1657 flags = in6p->in6p_flags; 1658 if (flags & IN6P_HIGHPORT) 1659 optval = IPV6_PORTRANGE_HIGH; 1660 else if (flags & IN6P_LOWPORT) 1661 optval = IPV6_PORTRANGE_LOW; 1662 else 1663 optval = 0; 1664 break; 1665 } 1666 } 1667 error = sooptcopyout(sopt, &optval, 1668 sizeof optval); 1669 break; 1670 1671 case IPV6_PKTINFO: 1672 case IPV6_HOPLIMIT: 1673 case IPV6_HOPOPTS: 1674 case IPV6_RTHDR: 1675 case IPV6_DSTOPTS: 1676 if ((optname == IPV6_HOPOPTS || 1677 optname == IPV6_DSTOPTS) && 1678 !privileged) 1679 return(EPERM); 1680 switch (optname) { 1681 case IPV6_PKTINFO: 1682 optval = OPTBIT(IN6P_PKTINFO); 1683 break; 1684 case IPV6_HOPLIMIT: 1685 optval = OPTBIT(IN6P_HOPLIMIT); 1686 break; 1687 case IPV6_HOPOPTS: 1688 if (!privileged) 1689 return(EPERM); 1690 optval = OPTBIT(IN6P_HOPOPTS); 1691 break; 1692 case IPV6_RTHDR: 1693 optval = OPTBIT(IN6P_RTHDR); 1694 break; 1695 case IPV6_DSTOPTS: 1696 if (!privileged) 1697 return(EPERM); 1698 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1699 break; 1700 } 1701 error = sooptcopyout(sopt, &optval, 1702 sizeof optval); 1703 break; 1704 1705 case IPV6_MULTICAST_IF: 1706 case IPV6_MULTICAST_HOPS: 1707 case IPV6_MULTICAST_LOOP: 1708 case IPV6_JOIN_GROUP: 1709 case IPV6_LEAVE_GROUP: 1710 { 1711 struct mbuf *m; 1712 error = ip6_getmoptions(sopt->sopt_name, 1713 in6p->in6p_moptions, &m); 1714 if (error == 0) 1715 error = sooptcopyout(sopt, 1716 mtod(m, char *), m->m_len); 1717 m_freem(m); 1718 } 1719 break; 1720 1721 #if IPSEC 1722 case IPV6_IPSEC_POLICY: 1723 { 1724 caddr_t req = NULL; 1725 size_t len = 0; 1726 struct mbuf *m = NULL; 1727 struct mbuf **mp = &m; 1728 1729 if (sopt->sopt_valsize > MCLBYTES) { 1730 error = EMSGSIZE; 1731 break; 1732 } 1733 error = soopt_getm(sopt, &m); /* XXX */ 1734 if (error != NULL) 1735 break; 1736 error = soopt_mcopyin(sopt, m); /* XXX */ 1737 if (error != NULL) 1738 break; 1739 if (m) { 1740 req = mtod(m, caddr_t); 1741 len = m->m_len; 1742 } 1743 lck_mtx_lock(sadb_mutex); 1744 error = ipsec6_get_policy(in6p, req, len, mp); 1745 lck_mtx_unlock(sadb_mutex); 1746 if (error == 0) 1747 error = soopt_mcopyout(sopt, m); /*XXX*/ 1748 if (error == 0 && m) 1749 m_freem(m); 1750 break; 1751 } 1752 #endif /* KAME IPSEC */ 1753 1754 case IPV6_FW_GET: 1755 { 1756 if (ip6_fw_ctl_ptr == NULL && load_ipfw() != 0) 1757 return EINVAL; 1758 1759 error = (*ip6_fw_ctl_ptr)(sopt); 1760 } 1761 break; 1762 1763 default: 1764 error = ENOPROTOOPT; 1765 break; 1766 } 1767 break; 1768 } 1769 } else { 1770 error = EINVAL; 1771 } 1772 return(error); 1773 } 1774 1775 /* 1776 * Set up IP6 options in pcb for insertion in output packets or 1777 * specifying behavior of outgoing packets. 1778 */ 1779 static int 1780 ip6_pcbopts(pktopt, m, so, sopt) 1781 struct ip6_pktopts **pktopt; 1782 struct mbuf *m; 1783 struct socket *so; 1784 struct sockopt *sopt; 1785 { 1786 struct ip6_pktopts *opt = *pktopt; 1787 int error = 0; 1788 struct proc *p = sopt->sopt_p; 1789 int priv = 0; 1790 1791 /* turn off any old options. */ 1792 if (opt) { 1793 #if DIAGNOSTIC 1794 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1795 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1796 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1797 printf("ip6_pcbopts: all specified options are cleared.\n"); 1798 #endif 1799 ip6_clearpktopts(opt, 1, -1); 1800 } else 1801 opt = _MALLOC(sizeof(*opt), M_IP6OPT, M_WAITOK); 1802 *pktopt = NULL; 1803 1804 if (!m || m->m_len == 0) { 1805 /* 1806 * Only turning off any previous options, regardless of 1807 * whether the opt is just created or given. 1808 */ 1809 if (opt) 1810 FREE(opt, M_IP6OPT); 1811 return(0); 1812 } 1813 1814 /* set options specified by user. */ 1815 if (p && !proc_suser(p)) 1816 priv = 1; 1817 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1818 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1819 FREE(opt, M_IP6OPT); 1820 return(error); 1821 } 1822 *pktopt = opt; 1823 return(0); 1824 } 1825 1826 /* 1827 * initialize ip6_pktopts. beware that there are non-zero default values in 1828 * the struct. 1829 */ 1830 void 1831 init_ip6pktopts(opt) 1832 struct ip6_pktopts *opt; 1833 { 1834 1835 bzero(opt, sizeof(*opt)); 1836 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1837 } 1838 1839 void 1840 ip6_clearpktopts(pktopt, needfree, optname) 1841 struct ip6_pktopts *pktopt; 1842 int needfree, optname; 1843 { 1844 if (pktopt == NULL) 1845 return; 1846 1847 if (optname == -1) { 1848 if (needfree && pktopt->ip6po_pktinfo) 1849 FREE(pktopt->ip6po_pktinfo, M_IP6OPT); 1850 pktopt->ip6po_pktinfo = NULL; 1851 } 1852 if (optname == -1) 1853 pktopt->ip6po_hlim = -1; 1854 if (optname == -1) { 1855 if (needfree && pktopt->ip6po_nexthop) 1856 FREE(pktopt->ip6po_nexthop, M_IP6OPT); 1857 pktopt->ip6po_nexthop = NULL; 1858 } 1859 if (optname == -1) { 1860 if (needfree && pktopt->ip6po_hbh) 1861 FREE(pktopt->ip6po_hbh, M_IP6OPT); 1862 pktopt->ip6po_hbh = NULL; 1863 } 1864 if (optname == -1) { 1865 if (needfree && pktopt->ip6po_dest1) 1866 FREE(pktopt->ip6po_dest1, M_IP6OPT); 1867 pktopt->ip6po_dest1 = NULL; 1868 } 1869 if (optname == -1) { 1870 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1871 FREE(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1872 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1873 if (pktopt->ip6po_route.ro_rt) { 1874 rtfree(pktopt->ip6po_route.ro_rt); 1875 pktopt->ip6po_route.ro_rt = NULL; 1876 } 1877 } 1878 if (optname == -1) { 1879 if (needfree && pktopt->ip6po_dest2) 1880 FREE(pktopt->ip6po_dest2, M_IP6OPT); 1881 pktopt->ip6po_dest2 = NULL; 1882 } 1883 } 1884 1885 #define PKTOPT_EXTHDRCPY(type) \ 1886 do {\ 1887 if (src->type) {\ 1888 int hlen =\ 1889 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1890 dst->type = _MALLOC(hlen, M_IP6OPT, canwait);\ 1891 if (dst->type == NULL && canwait == M_NOWAIT)\ 1892 goto bad;\ 1893 bcopy(src->type, dst->type, hlen);\ 1894 }\ 1895 } while (0) 1896 1897 struct ip6_pktopts * 1898 ip6_copypktopts(src, canwait) 1899 struct ip6_pktopts *src; 1900 int canwait; 1901 { 1902 struct ip6_pktopts *dst; 1903 1904 if (src == NULL) { 1905 printf("ip6_clearpktopts: invalid argument\n"); 1906 return(NULL); 1907 } 1908 1909 dst = _MALLOC(sizeof(*dst), M_IP6OPT, canwait); 1910 if (dst == NULL && canwait == M_NOWAIT) 1911 return (NULL); 1912 bzero(dst, sizeof(*dst)); 1913 1914 dst->ip6po_hlim = src->ip6po_hlim; 1915 if (src->ip6po_pktinfo) { 1916 dst->ip6po_pktinfo = _MALLOC(sizeof(*dst->ip6po_pktinfo), 1917 M_IP6OPT, canwait); 1918 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1919 goto bad; 1920 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1921 } 1922 if (src->ip6po_nexthop) { 1923 dst->ip6po_nexthop = _MALLOC(src->ip6po_nexthop->sa_len, 1924 M_IP6OPT, canwait); 1925 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1926 goto bad; 1927 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1928 src->ip6po_nexthop->sa_len); 1929 } 1930 PKTOPT_EXTHDRCPY(ip6po_hbh); 1931 PKTOPT_EXTHDRCPY(ip6po_dest1); 1932 PKTOPT_EXTHDRCPY(ip6po_dest2); 1933 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1934 return(dst); 1935 1936 bad: 1937 if (dst->ip6po_pktinfo) FREE(dst->ip6po_pktinfo, M_IP6OPT); 1938 if (dst->ip6po_nexthop) FREE(dst->ip6po_nexthop, M_IP6OPT); 1939 if (dst->ip6po_hbh) FREE(dst->ip6po_hbh, M_IP6OPT); 1940 if (dst->ip6po_dest1) FREE(dst->ip6po_dest1, M_IP6OPT); 1941 if (dst->ip6po_dest2) FREE(dst->ip6po_dest2, M_IP6OPT); 1942 if (dst->ip6po_rthdr) FREE(dst->ip6po_rthdr, M_IP6OPT); 1943 FREE(dst, M_IP6OPT); 1944 return(NULL); 1945 } 1946 #undef PKTOPT_EXTHDRCPY 1947 1948 void 1949 ip6_freepcbopts(pktopt) 1950 struct ip6_pktopts *pktopt; 1951 { 1952 if (pktopt == NULL) 1953 return; 1954 1955 ip6_clearpktopts(pktopt, 1, -1); 1956 1957 FREE(pktopt, M_IP6OPT); 1958 } 1959 1960 /* 1961 * Set the IP6 multicast options in response to user setsockopt(). 1962 */ 1963 static int 1964 ip6_setmoptions( 1965 int optname, 1966 struct inpcb* in6p, 1967 struct mbuf *m) 1968 { 1969 int error = 0; 1970 u_int loop, ifindex; 1971 struct ipv6_mreq *mreq; 1972 struct ifnet *ifp; 1973 struct ip6_moptions **im6op = &in6p->in6p_moptions; 1974 struct ip6_moptions *im6o = *im6op; 1975 struct ip_moptions *imo; 1976 struct route_in6 ro; 1977 struct sockaddr_in6 *dst; 1978 struct in6_multi_mship *imm; 1979 struct proc *p = current_proc(); /* XXX */ 1980 1981 if (im6o == NULL) { 1982 /* 1983 * No multicast option buffer attached to the pcb; 1984 * allocate one and initialize to default values. 1985 */ 1986 im6o = (struct ip6_moptions *) 1987 _MALLOC(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1988 1989 if (im6o == NULL) 1990 return(ENOBUFS); 1991 *im6op = im6o; 1992 im6o->im6o_multicast_ifp = NULL; 1993 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1994 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1995 LIST_INIT(&im6o->im6o_memberships); 1996 } 1997 1998 if (in6p->inp_moptions == NULL) { 1999 /* 2000 * No IPv4 multicast option buffer attached to the pcb; 2001 * call ip_createmoptions to allocate one and initialize 2002 * to default values. 2003 */ 2004 error = ip_createmoptions(&in6p->inp_moptions); 2005 if (error != 0) 2006 return error; 2007 } 2008 imo = in6p->inp_moptions; 2009 2010 switch (optname) { 2011 2012 case IPV6_MULTICAST_IF: 2013 /* 2014 * Select the interface for outgoing multicast packets. 2015 */ 2016 if (m == NULL || m->m_len != sizeof(u_int)) { 2017 error = EINVAL; 2018 break; 2019 } 2020 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2021 if (ifindex < 0 || if_index < ifindex) { 2022 error = ENXIO; /* XXX EINVAL? */ 2023 break; 2024 } 2025 ifp = ifindex2ifnet[ifindex]; 2026 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2027 error = EADDRNOTAVAIL; 2028 break; 2029 } 2030 im6o->im6o_multicast_ifp = ifp; 2031 imo->imo_multicast_ifp = ifp; 2032 break; 2033 2034 case IPV6_MULTICAST_HOPS: 2035 { 2036 /* 2037 * Set the IP6 hoplimit for outgoing multicast packets. 2038 */ 2039 int optval; 2040 if (m == NULL || m->m_len != sizeof(int)) { 2041 error = EINVAL; 2042 break; 2043 } 2044 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2045 if (optval < -1 || optval >= 256) 2046 error = EINVAL; 2047 else if (optval == -1) { 2048 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2049 imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; 2050 } else { 2051 im6o->im6o_multicast_hlim = optval; 2052 imo->imo_multicast_ttl = optval; 2053 } 2054 break; 2055 } 2056 2057 case IPV6_MULTICAST_LOOP: 2058 /* 2059 * Set the loopback flag for outgoing multicast packets. 2060 * Must be zero or one. 2061 */ 2062 if (m == NULL || m->m_len != sizeof(u_int)) { 2063 error = EINVAL; 2064 break; 2065 } 2066 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2067 if (loop > 1) { 2068 error = EINVAL; 2069 break; 2070 } 2071 im6o->im6o_multicast_loop = loop; 2072 imo->imo_multicast_loop = loop; 2073 break; 2074 2075 case IPV6_JOIN_GROUP: 2076 /* 2077 * Add a multicast group membership. 2078 * Group must be a valid IP6 multicast address. 2079 */ 2080 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2081 error = EINVAL; 2082 break; 2083 } 2084 mreq = mtod(m, struct ipv6_mreq *); 2085 /* 2086 * If the interface is specified, validate it. 2087 */ 2088 if (mreq->ipv6mr_interface < 0 2089 || if_index < mreq->ipv6mr_interface) { 2090 error = ENXIO; /* XXX EINVAL? */ 2091 break; 2092 } 2093 2094 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2095 /* 2096 * We use the unspecified address to specify to accept 2097 * all multicast addresses. Only super user is allowed 2098 * to do this. 2099 */ 2100 if (suser(kauth_cred_get(), 0)) 2101 { 2102 error = EACCES; 2103 break; 2104 } 2105 } else if (IN6_IS_ADDR_V4MAPPED(&mreq->ipv6mr_multiaddr)) { 2106 struct ip_mreq v4req; 2107 2108 v4req.imr_multiaddr.s_addr = mreq->ipv6mr_multiaddr.s6_addr32[3]; 2109 v4req.imr_interface.s_addr = INADDR_ANY; 2110 2111 /* Find an IPv4 address on the specified interface. */ 2112 if (mreq->ipv6mr_interface != 0) { 2113 struct in_ifaddr *ifa; 2114 2115 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2116 2117 lck_mtx_lock(rt_mtx); 2118 TAILQ_FOREACH(ifa, &in_ifaddrhead, ia_link) { 2119 if (ifa->ia_ifp == ifp) { 2120 v4req.imr_interface = IA_SIN(ifa)->sin_addr; 2121 break; 2122 } 2123 } 2124 lck_mtx_unlock(rt_mtx); 2125 2126 if (v4req.imr_multiaddr.s_addr == 0) { 2127 /* Interface has no IPv4 address. */ 2128 error = EINVAL; 2129 break; 2130 } 2131 } 2132 2133 error = ip_addmembership(imo, &v4req); 2134 break; 2135 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2136 error = EINVAL; 2137 break; 2138 } 2139 /* 2140 * If no interface was explicitly specified, choose an 2141 * appropriate one according to the given multicast address. 2142 */ 2143 if (mreq->ipv6mr_interface == 0) { 2144 /* 2145 * If the multicast address is in node-local scope, 2146 * the interface should be a loopback interface. 2147 * Otherwise, look up the routing table for the 2148 * address, and choose the outgoing interface. 2149 * XXX: is it a good approach? 2150 */ 2151 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2152 ifp = &loif[0]; 2153 } else { 2154 ro.ro_rt = NULL; 2155 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2156 bzero(dst, sizeof(*dst)); 2157 dst->sin6_len = sizeof(struct sockaddr_in6); 2158 dst->sin6_family = AF_INET6; 2159 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2160 rtalloc((struct route *)&ro); 2161 if (ro.ro_rt == NULL) { 2162 error = EADDRNOTAVAIL; 2163 break; 2164 } 2165 ifp = ro.ro_rt->rt_ifp; 2166 rtfree(ro.ro_rt); 2167 } 2168 } else 2169 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2170 2171 /* 2172 * See if we found an interface, and confirm that it 2173 * supports multicast 2174 */ 2175 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2176 error = EADDRNOTAVAIL; 2177 break; 2178 } 2179 /* 2180 * Put interface index into the multicast address, 2181 * if the address has link-local scope. 2182 */ 2183 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2184 mreq->ipv6mr_multiaddr.s6_addr16[1] 2185 = htons(mreq->ipv6mr_interface); 2186 } 2187 /* 2188 * See if the membership already exists. 2189 */ 2190 lck_mtx_lock(nd6_mutex); 2191 for (imm = im6o->im6o_memberships.lh_first; 2192 imm != NULL; imm = imm->i6mm_chain.le_next) 2193 if (imm->i6mm_maddr->in6m_ifp == ifp && 2194 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2195 &mreq->ipv6mr_multiaddr)) 2196 break; 2197 if (imm != NULL) { 2198 error = EADDRINUSE; 2199 lck_mtx_unlock(nd6_mutex); 2200 break; 2201 } 2202 /* 2203 * Everything looks good; add a new record to the multicast 2204 * address list for the given interface. 2205 */ 2206 imm = _MALLOC(sizeof(*imm), M_IPMADDR, M_WAITOK); 2207 if (imm == NULL) { 2208 error = ENOBUFS; 2209 lck_mtx_unlock(nd6_mutex); 2210 break; 2211 } 2212 if ((imm->i6mm_maddr = 2213 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error, 1)) == NULL) { 2214 FREE(imm, M_IPMADDR); 2215 lck_mtx_unlock(nd6_mutex); 2216 break; 2217 } 2218 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2219 lck_mtx_unlock(nd6_mutex); 2220 break; 2221 2222 case IPV6_LEAVE_GROUP: 2223 /* 2224 * Drop a multicast group membership. 2225 * Group must be a valid IP6 multicast address. 2226 */ 2227 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2228 error = EINVAL; 2229 break; 2230 } 2231 mreq = mtod(m, struct ipv6_mreq *); 2232 /* 2233 * If an interface address was specified, get a pointer 2234 * to its ifnet structure. 2235 */ 2236 if (mreq->ipv6mr_interface < 0 2237 || if_index < mreq->ipv6mr_interface) { 2238 error = ENXIO; /* XXX EINVAL? */ 2239 break; 2240 } 2241 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2242 2243 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2244 if (suser(kauth_cred_get(), 0)) { 2245 error = EACCES; 2246 break; 2247 } 2248 } else if (IN6_IS_ADDR_V4MAPPED(&mreq->ipv6mr_multiaddr)) { 2249 struct ip_mreq v4req; 2250 2251 v4req.imr_multiaddr.s_addr = mreq->ipv6mr_multiaddr.s6_addr32[3]; 2252 v4req.imr_interface.s_addr = INADDR_ANY; 2253 2254 if (ifp != NULL) { 2255 struct in_ifaddr *ifa; 2256 2257 lck_mtx_lock(rt_mtx); 2258 TAILQ_FOREACH(ifa, &in_ifaddrhead, ia_link) { 2259 if (ifa->ia_ifp == ifp) { 2260 v4req.imr_interface = IA_SIN(ifa)->sin_addr; 2261 break; 2262 } 2263 } 2264 lck_mtx_unlock(rt_mtx); 2265 } 2266 2267 error = ip_dropmembership(imo, &v4req); 2268 break; 2269 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2270 error = EINVAL; 2271 break; 2272 } 2273 /* 2274 * Put interface index into the multicast address, 2275 * if the address has link-local scope. 2276 */ 2277 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2278 mreq->ipv6mr_multiaddr.s6_addr16[1] 2279 = htons(mreq->ipv6mr_interface); 2280 } 2281 /* 2282 * Find the membership in the membership list. 2283 */ 2284 lck_mtx_lock(nd6_mutex); 2285 for (imm = im6o->im6o_memberships.lh_first; 2286 imm != NULL; imm = imm->i6mm_chain.le_next) { 2287 if ((ifp == NULL || 2288 imm->i6mm_maddr->in6m_ifp == ifp) && 2289 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2290 &mreq->ipv6mr_multiaddr)) 2291 break; 2292 } 2293 if (imm == NULL) { 2294 /* Unable to resolve interface */ 2295 error = EADDRNOTAVAIL; 2296 lck_mtx_unlock(nd6_mutex); 2297 break; 2298 } 2299 /* 2300 * Give up the multicast address record to which the 2301 * membership points. 2302 */ 2303 LIST_REMOVE(imm, i6mm_chain); 2304 in6_delmulti(imm->i6mm_maddr, 1); 2305 lck_mtx_unlock(nd6_mutex); 2306 FREE(imm, M_IPMADDR); 2307 break; 2308 2309 default: 2310 error = EOPNOTSUPP; 2311 break; 2312 } 2313 2314 /* 2315 * If all options have default values, no need to keep the mbuf. 2316 */ 2317 lck_mtx_lock(nd6_mutex); 2318 if (im6o->im6o_multicast_ifp == NULL && 2319 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2320 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2321 im6o->im6o_memberships.lh_first == NULL) { 2322 FREE(*im6op, M_IPMOPTS); 2323 *im6op = NULL; 2324 } 2325 if (imo->imo_multicast_ifp == NULL && 2326 imo->imo_multicast_vif == -1 && 2327 imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && 2328 imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && 2329 imo->imo_num_memberships == 0) { 2330 ip_freemoptions(imo); 2331 in6p->inp_moptions = 0; 2332 } 2333 lck_mtx_unlock(nd6_mutex); 2334 2335 return(error); 2336 } 2337 2338 /* 2339 * Return the IP6 multicast options in response to user getsockopt(). 2340 */ 2341 static int 2342 ip6_getmoptions(optname, im6o, mp) 2343 int optname; 2344 struct ip6_moptions *im6o; 2345 struct mbuf **mp; 2346 { 2347 u_int *hlim, *loop, *ifindex; 2348 2349 *mp = m_get(M_WAIT, MT_HEADER); /*XXX*/ 2350 2351 switch (optname) { 2352 2353 case IPV6_MULTICAST_IF: 2354 ifindex = mtod(*mp, u_int *); 2355 (*mp)->m_len = sizeof(u_int); 2356 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2357 *ifindex = 0; 2358 else 2359 *ifindex = im6o->im6o_multicast_ifp->if_index; 2360 return(0); 2361 2362 case IPV6_MULTICAST_HOPS: 2363 hlim = mtod(*mp, u_int *); 2364 (*mp)->m_len = sizeof(u_int); 2365 if (im6o == NULL) 2366 *hlim = ip6_defmcasthlim; 2367 else 2368 *hlim = im6o->im6o_multicast_hlim; 2369 return(0); 2370 2371 case IPV6_MULTICAST_LOOP: 2372 loop = mtod(*mp, u_int *); 2373 (*mp)->m_len = sizeof(u_int); 2374 if (im6o == NULL) 2375 *loop = ip6_defmcasthlim; 2376 else 2377 *loop = im6o->im6o_multicast_loop; 2378 return(0); 2379 2380 default: 2381 return(EOPNOTSUPP); 2382 } 2383 } 2384 2385 /* 2386 * Discard the IP6 multicast options. 2387 */ 2388 void 2389 ip6_freemoptions(im6o) 2390 struct ip6_moptions *im6o; 2391 { 2392 struct in6_multi_mship *imm; 2393 2394 if (im6o == NULL) 2395 return; 2396 2397 lck_mtx_lock(nd6_mutex); 2398 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2399 LIST_REMOVE(imm, i6mm_chain); 2400 if (imm->i6mm_maddr) 2401 in6_delmulti(imm->i6mm_maddr, 1); 2402 FREE(imm, M_IPMADDR); 2403 } 2404 lck_mtx_unlock(nd6_mutex); 2405 FREE(im6o, M_IPMOPTS); 2406 } 2407 2408 /* 2409 * Set IPv6 outgoing packet options based on advanced API. 2410 */ 2411 int 2412 ip6_setpktoptions(control, opt, priv, needcopy) 2413 struct mbuf *control; 2414 struct ip6_pktopts *opt; 2415 int priv, needcopy; 2416 { 2417 struct cmsghdr *cm = 0; 2418 2419 if (control == 0 || opt == 0) 2420 return(EINVAL); 2421 2422 init_ip6pktopts(opt); 2423 2424 /* 2425 * XXX: Currently, we assume all the optional information is stored 2426 * in a single mbuf. 2427 */ 2428 if (control->m_next) 2429 return(EINVAL); 2430 2431 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2432 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2433 cm = mtod(control, struct cmsghdr *); 2434 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2435 return(EINVAL); 2436 if (cm->cmsg_level != IPPROTO_IPV6) 2437 continue; 2438 2439 /* 2440 * XXX should check if RFC2292 API is mixed with 2292bis API 2441 */ 2442 switch (cm->cmsg_type) { 2443 case IPV6_PKTINFO: 2444 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2445 return(EINVAL); 2446 if (needcopy) { 2447 /* XXX: Is it really WAITOK? */ 2448 opt->ip6po_pktinfo = 2449 _MALLOC(sizeof(struct in6_pktinfo), 2450 M_IP6OPT, M_WAITOK); 2451 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2452 sizeof(struct in6_pktinfo)); 2453 } else 2454 opt->ip6po_pktinfo = 2455 (struct in6_pktinfo *)CMSG_DATA(cm); 2456 if (opt->ip6po_pktinfo->ipi6_ifindex && 2457 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2458 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2459 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2460 2461 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2462 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2463 return(ENXIO); 2464 } 2465 2466 /* 2467 * Check if the requested source address is indeed a 2468 * unicast address assigned to the node, and can be 2469 * used as the packet's source address. 2470 */ 2471 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2472 struct in6_ifaddr *ia6; 2473 struct sockaddr_in6 sin6; 2474 2475 bzero(&sin6, sizeof(sin6)); 2476 sin6.sin6_len = sizeof(sin6); 2477 sin6.sin6_family = AF_INET6; 2478 sin6.sin6_addr = 2479 opt->ip6po_pktinfo->ipi6_addr; 2480 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2481 if (ia6 == NULL || 2482 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2483 IN6_IFF_NOTREADY)) != 0) { 2484 if (ia6) ifafree(&ia6->ia_ifa); 2485 return(EADDRNOTAVAIL); 2486 } 2487 ifafree(&ia6->ia_ifa); 2488 ia6 = NULL; 2489 } 2490 break; 2491 2492 case IPV6_HOPLIMIT: 2493 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2494 return(EINVAL); 2495 2496 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2497 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2498 return(EINVAL); 2499 break; 2500 2501 case IPV6_NEXTHOP: 2502 if (!priv) 2503 return(EPERM); 2504 2505 if (cm->cmsg_len < sizeof(u_char) || 2506 /* check if cmsg_len is large enough for sa_len */ 2507 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2508 return(EINVAL); 2509 2510 if (needcopy) { 2511 opt->ip6po_nexthop = 2512 _MALLOC(*CMSG_DATA(cm), 2513 M_IP6OPT, M_WAITOK); 2514 bcopy(CMSG_DATA(cm), 2515 opt->ip6po_nexthop, 2516 *CMSG_DATA(cm)); 2517 } else 2518 opt->ip6po_nexthop = 2519 (struct sockaddr *)CMSG_DATA(cm); 2520 break; 2521 2522 case IPV6_HOPOPTS: 2523 { 2524 struct ip6_hbh *hbh; 2525 int hbhlen; 2526 2527 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2528 return(EINVAL); 2529 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2530 hbhlen = (hbh->ip6h_len + 1) << 3; 2531 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2532 return(EINVAL); 2533 2534 if (needcopy) { 2535 opt->ip6po_hbh = 2536 _MALLOC(hbhlen, M_IP6OPT, M_WAITOK); 2537 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2538 } else 2539 opt->ip6po_hbh = hbh; 2540 break; 2541 } 2542 2543 case IPV6_DSTOPTS: 2544 { 2545 struct ip6_dest *dest, **newdest; 2546 int destlen; 2547 2548 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2549 return(EINVAL); 2550 dest = (struct ip6_dest *)CMSG_DATA(cm); 2551 destlen = (dest->ip6d_len + 1) << 3; 2552 if (cm->cmsg_len != CMSG_LEN(destlen)) 2553 return(EINVAL); 2554 2555 /* 2556 * The old advacned API is ambiguous on this 2557 * point. Our approach is to determine the 2558 * position based according to the existence 2559 * of a routing header. Note, however, that 2560 * this depends on the order of the extension 2561 * headers in the ancillary data; the 1st part 2562 * of the destination options header must 2563 * appear before the routing header in the 2564 * ancillary data, too. 2565 * RFC2292bis solved the ambiguity by 2566 * introducing separate cmsg types. 2567 */ 2568 if (opt->ip6po_rthdr == NULL) 2569 newdest = &opt->ip6po_dest1; 2570 else 2571 newdest = &opt->ip6po_dest2; 2572 2573 if (needcopy) { 2574 *newdest = _MALLOC(destlen, M_IP6OPT, M_WAITOK); 2575 bcopy(dest, *newdest, destlen); 2576 } else 2577 *newdest = dest; 2578 2579 break; 2580 } 2581 2582 case IPV6_RTHDR: 2583 { 2584 struct ip6_rthdr *rth; 2585 int rthlen; 2586 2587 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2588 return(EINVAL); 2589 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2590 rthlen = (rth->ip6r_len + 1) << 3; 2591 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2592 return(EINVAL); 2593 2594 switch (rth->ip6r_type) { 2595 case IPV6_RTHDR_TYPE_0: 2596 /* must contain one addr */ 2597 if (rth->ip6r_len == 0) 2598 return(EINVAL); 2599 /* length must be even */ 2600 if (rth->ip6r_len % 2) 2601 return(EINVAL); 2602 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2603 return(EINVAL); 2604 break; 2605 default: 2606 return(EINVAL); /* not supported */ 2607 } 2608 2609 if (needcopy) { 2610 opt->ip6po_rthdr = _MALLOC(rthlen, M_IP6OPT, 2611 M_WAITOK); 2612 bcopy(rth, opt->ip6po_rthdr, rthlen); 2613 } else 2614 opt->ip6po_rthdr = rth; 2615 2616 break; 2617 } 2618 2619 default: 2620 return(ENOPROTOOPT); 2621 } 2622 } 2623 2624 return(0); 2625 } 2626 2627 /* 2628 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2629 * packet to the input queue of a specified interface. Note that this 2630 * calls the output routine of the loopback "driver", but with an interface 2631 * pointer that might NOT be &loif -- easier than replicating that code here. 2632 */ 2633 void 2634 ip6_mloopback( 2635 struct ifnet *ifp, 2636 struct mbuf *m, 2637 struct sockaddr_in6 *dst) 2638 { 2639 struct mbuf *copym; 2640 struct ip6_hdr *ip6; 2641 2642 copym = m_copy(m, 0, M_COPYALL); 2643 if (copym == NULL) 2644 return; 2645 2646 /* 2647 * Make sure to deep-copy IPv6 header portion in case the data 2648 * is in an mbuf cluster, so that we can safely override the IPv6 2649 * header portion later. 2650 */ 2651 if ((copym->m_flags & M_EXT) != 0 || 2652 copym->m_len < sizeof(struct ip6_hdr)) { 2653 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2654 if (copym == NULL) 2655 return; 2656 } 2657 2658 #if DIAGNOSTIC 2659 if (copym->m_len < sizeof(*ip6)) { 2660 m_freem(copym); 2661 return; 2662 } 2663 #endif 2664 2665 ip6 = mtod(copym, struct ip6_hdr *); 2666 #ifndef SCOPEDROUTING 2667 /* 2668 * clear embedded scope identifiers if necessary. 2669 * in6_clearscope will touch the addresses only when necessary. 2670 */ 2671 in6_clearscope(&ip6->ip6_src); 2672 in6_clearscope(&ip6->ip6_dst); 2673 #endif 2674 2675 #ifdef __APPLE__ 2676 2677 /* Makes sure the HW checksum flags are cleaned before sending the packet */ 2678 2679 copym->m_pkthdr.rcvif = 0; 2680 copym->m_pkthdr.csum_data = 0; 2681 copym->m_pkthdr.csum_flags = 0; 2682 2683 if (lo_ifp) { 2684 copym->m_pkthdr.rcvif = ifp; 2685 lck_mtx_unlock(ip6_mutex); 2686 dlil_output(lo_ifp, PF_INET6, copym, 0, (struct sockaddr *)dst, 0); 2687 lck_mtx_lock(ip6_mutex); 2688 } else 2689 m_free(copym); 2690 #else 2691 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2692 #endif 2693 } 2694 2695 /* 2696 * Chop IPv6 header off from the payload. 2697 */ 2698 static int 2699 ip6_splithdr(m, exthdrs) 2700 struct mbuf *m; 2701 struct ip6_exthdrs *exthdrs; 2702 { 2703 struct mbuf *mh; 2704 struct ip6_hdr *ip6; 2705 2706 ip6 = mtod(m, struct ip6_hdr *); 2707 if (m->m_len > sizeof(*ip6)) { 2708 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2709 if (mh == 0) { 2710 m_freem(m); 2711 return ENOBUFS; 2712 } 2713 M_COPY_PKTHDR(mh, m); 2714 MH_ALIGN(mh, sizeof(*ip6)); 2715 m->m_flags &= ~M_PKTHDR; 2716 m->m_len -= sizeof(*ip6); 2717 m->m_data += sizeof(*ip6); 2718 mh->m_next = m; 2719 m = mh; 2720 m->m_len = sizeof(*ip6); 2721 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2722 } 2723 exthdrs->ip6e_ip6 = m; 2724 return 0; 2725 } 2726 2727 /* 2728 * Compute IPv6 extension header length. 2729 */ 2730 int 2731 ip6_optlen(in6p) 2732 struct in6pcb *in6p; 2733 { 2734 int len; 2735 2736 if (!in6p->in6p_outputopts) 2737 return 0; 2738 2739 len = 0; 2740 #define elen(x) \ 2741 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2742 2743 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2744 if (in6p->in6p_outputopts->ip6po_rthdr) 2745 /* dest1 is valid with rthdr only */ 2746 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2747 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2748 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2749 return len; 2750 #undef elen 2751 }
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