1 /* $OpenBSD: ip6_output.c,v 1.79 2003/11/07 22:32:47 itojun Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include "pf.h" 65 66 #include <sys/param.h> 67 #include <sys/malloc.h> 68 #include <sys/mbuf.h> 69 #include <sys/errno.h> 70 #include <sys/protosw.h> 71 #include <sys/socket.h> 72 #include <sys/socketvar.h> 73 #include <sys/systm.h> 74 #include <sys/proc.h> 75 76 #include <net/if.h> 77 #include <net/route.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_var.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/ip.h> 83 #include <netinet/in_pcb.h> 84 85 #include <netinet/ip6.h> 86 #include <netinet/icmp6.h> 87 #include <netinet6/ip6_var.h> 88 #include <netinet6/nd6.h> 89 90 #if NPF > 0 91 #include <net/pfvar.h> 92 #endif 93 94 #ifdef IPSEC 95 #include <netinet/ip_ah.h> 96 #include <netinet/ip_esp.h> 97 #include <netinet/udp.h> 98 #include <netinet/tcp.h> 99 #include <net/pfkeyv2.h> 100 101 extern u_int8_t get_sa_require(struct inpcb *); 102 103 extern int ipsec_auth_default_level; 104 extern int ipsec_esp_trans_default_level; 105 extern int ipsec_esp_network_default_level; 106 extern int ipsec_ipcomp_default_level; 107 #endif /* IPSEC */ 108 109 struct ip6_exthdrs { 110 struct mbuf *ip6e_ip6; 111 struct mbuf *ip6e_hbh; 112 struct mbuf *ip6e_dest1; 113 struct mbuf *ip6e_rthdr; 114 struct mbuf *ip6e_dest2; 115 }; 116 117 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, struct socket *); 118 static int ip6_setmoptions(int, struct ip6_moptions **, struct mbuf *); 119 static int ip6_getmoptions(int, struct ip6_moptions *, struct mbuf **); 120 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 121 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 122 struct ip6_frag **); 123 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 124 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 125 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 126 struct ifnet *, struct in6_addr *, u_long *); 127 128 /* 129 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 130 * header (with pri, len, nxt, hlim, src, dst). 131 * This function may modify ver and hlim only. 132 * The mbuf chain containing the packet will be freed. 133 * The mbuf opt, if present, will not be freed. 134 * 135 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 136 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 137 * which is rt_rmx.rmx_mtu. 138 */ 139 int 140 ip6_output(m0, opt, ro, flags, im6o, ifpp) 141 struct mbuf *m0; 142 struct ip6_pktopts *opt; 143 struct route_in6 *ro; 144 int flags; 145 struct ip6_moptions *im6o; 146 struct ifnet **ifpp; /* XXX: just for statistics */ 147 { 148 struct ip6_hdr *ip6, *mhip6; 149 struct ifnet *ifp, *origifp; 150 struct mbuf *m = m0; 151 int hlen, tlen, len, off; 152 struct route_in6 ip6route; 153 struct sockaddr_in6 *dst; 154 int error = 0; 155 struct in6_ifaddr *ia; 156 u_long mtu; 157 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 158 struct ip6_exthdrs exthdrs; 159 struct in6_addr finaldst; 160 struct route_in6 *ro_pmtu = NULL; 161 int hdrsplit = 0; 162 u_int8_t sproto = 0; 163 #ifdef IPSEC 164 struct m_tag *mtag; 165 union sockaddr_union sdst; 166 struct tdb_ident *tdbi; 167 u_int32_t sspi; 168 struct inpcb *inp; 169 struct tdb *tdb; 170 int s; 171 #endif /* IPSEC */ 172 173 #ifdef IPSEC 174 inp = NULL; /*XXX*/ 175 if (inp && (inp->inp_flags & INP_IPV6) == 0) 176 panic("ip6_output: IPv4 pcb is passed"); 177 #endif /* IPSEC */ 178 179 #define MAKE_EXTHDR(hp, mp) \ 180 do { \ 181 if (hp) { \ 182 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 183 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 184 ((eh)->ip6e_len + 1) << 3); \ 185 if (error) \ 186 goto freehdrs; \ 187 } \ 188 } while (0) 189 190 bzero(&exthdrs, sizeof(exthdrs)); 191 if (opt) { 192 /* Hop-by-Hop options header */ 193 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 194 /* Destination options header(1st part) */ 195 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 196 /* Routing header */ 197 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 198 /* Destination options header(2nd part) */ 199 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 200 } 201 202 #ifdef IPSEC 203 /* 204 * splnet is chosen over spltdb because we are not allowed to 205 * lower the level, and udp6_output calls us in splnet(). XXX check 206 */ 207 s = splnet(); 208 209 /* 210 * Check if there was an outgoing SA bound to the flow 211 * from a transport protocol. 212 */ 213 ip6 = mtod(m, struct ip6_hdr *); 214 215 /* Do we have any pending SAs to apply ? */ 216 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 217 if (mtag != NULL) { 218 #ifdef DIAGNOSTIC 219 if (mtag->m_tag_len != sizeof (struct tdb_ident)) 220 panic("ip6_output: tag of length %d (should be %d", 221 mtag->m_tag_len, sizeof (struct tdb_ident)); 222 #endif 223 tdbi = (struct tdb_ident *)(mtag + 1); 224 tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto); 225 if (tdb == NULL) 226 error = -EINVAL; 227 m_tag_delete(m, mtag); 228 } else 229 tdb = ipsp_spd_lookup(m, AF_INET6, sizeof(struct ip6_hdr), 230 &error, IPSP_DIRECTION_OUT, NULL, inp); 231 232 if (tdb == NULL) { 233 splx(s); 234 235 if (error == 0) { 236 /* 237 * No IPsec processing required, we'll just send the 238 * packet out. 239 */ 240 sproto = 0; 241 242 /* Fall through to routing/multicast handling */ 243 } else { 244 /* 245 * -EINVAL is used to indicate that the packet should 246 * be silently dropped, typically because we've asked 247 * key management for an SA. 248 */ 249 if (error == -EINVAL) /* Should silently drop packet */ 250 error = 0; 251 252 goto freehdrs; 253 } 254 } else { 255 /* Loop detection */ 256 for (mtag = m_tag_first(m); mtag != NULL; 257 mtag = m_tag_next(m, mtag)) { 258 if (mtag->m_tag_id != PACKET_TAG_IPSEC_OUT_DONE && 259 mtag->m_tag_id != 260 PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED) 261 continue; 262 tdbi = (struct tdb_ident *)(mtag + 1); 263 if (tdbi->spi == tdb->tdb_spi && 264 tdbi->proto == tdb->tdb_sproto && 265 !bcmp(&tdbi->dst, &tdb->tdb_dst, 266 sizeof(union sockaddr_union))) { 267 splx(s); 268 sproto = 0; /* mark as no-IPsec-needed */ 269 goto done_spd; 270 } 271 } 272 273 /* We need to do IPsec */ 274 bcopy(&tdb->tdb_dst, &sdst, sizeof(sdst)); 275 sspi = tdb->tdb_spi; 276 sproto = tdb->tdb_sproto; 277 splx(s); 278 279 #if 1 /* XXX */ 280 /* if we have any extension header, we cannot perform IPsec */ 281 if (exthdrs.ip6e_hbh || exthdrs.ip6e_dest1 || 282 exthdrs.ip6e_rthdr || exthdrs.ip6e_dest2) { 283 error = EHOSTUNREACH; 284 goto freehdrs; 285 } 286 #endif 287 } 288 289 /* Fall through to the routing/multicast handling code */ 290 done_spd: 291 #endif /* IPSEC */ 292 293 /* 294 * Calculate the total length of the extension header chain. 295 * Keep the length of the unfragmentable part for fragmentation. 296 */ 297 optlen = 0; 298 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 299 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 300 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 301 unfragpartlen = optlen + sizeof(struct ip6_hdr); 302 /* NOTE: we don't add AH/ESP length here. do that later. */ 303 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 304 305 /* 306 * If we need IPsec, or there is at least one extension header, 307 * separate IP6 header from the payload. 308 */ 309 if ((sproto || optlen) && !hdrsplit) { 310 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 311 m = NULL; 312 goto freehdrs; 313 } 314 m = exthdrs.ip6e_ip6; 315 hdrsplit++; 316 } 317 318 /* adjust pointer */ 319 ip6 = mtod(m, struct ip6_hdr *); 320 321 /* adjust mbuf packet header length */ 322 m->m_pkthdr.len += optlen; 323 plen = m->m_pkthdr.len - sizeof(*ip6); 324 325 /* If this is a jumbo payload, insert a jumbo payload option. */ 326 if (plen > IPV6_MAXPACKET) { 327 if (!hdrsplit) { 328 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 329 m = NULL; 330 goto freehdrs; 331 } 332 m = exthdrs.ip6e_ip6; 333 hdrsplit++; 334 } 335 /* adjust pointer */ 336 ip6 = mtod(m, struct ip6_hdr *); 337 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 338 goto freehdrs; 339 ip6->ip6_plen = 0; 340 } else 341 ip6->ip6_plen = htons(plen); 342 343 /* 344 * Concatenate headers and fill in next header fields. 345 * Here we have, on "m" 346 * IPv6 payload 347 * and we insert headers accordingly. Finally, we should be getting: 348 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 349 * 350 * during the header composing process, "m" points to IPv6 header. 351 * "mprev" points to an extension header prior to esp. 352 */ 353 { 354 u_char *nexthdrp = &ip6->ip6_nxt; 355 struct mbuf *mprev = m; 356 357 /* 358 * we treat dest2 specially. this makes IPsec processing 359 * much easier. 360 * 361 * result: IPv6 dest2 payload 362 * m and mprev will point to IPv6 header. 363 */ 364 if (exthdrs.ip6e_dest2) { 365 if (!hdrsplit) 366 panic("assumption failed: hdr not split"); 367 exthdrs.ip6e_dest2->m_next = m->m_next; 368 m->m_next = exthdrs.ip6e_dest2; 369 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 370 ip6->ip6_nxt = IPPROTO_DSTOPTS; 371 } 372 373 #define MAKE_CHAIN(m, mp, p, i)\ 374 do {\ 375 if (m) {\ 376 if (!hdrsplit) \ 377 panic("assumption failed: hdr not split"); \ 378 *mtod((m), u_char *) = *(p);\ 379 *(p) = (i);\ 380 p = mtod((m), u_char *);\ 381 (m)->m_next = (mp)->m_next;\ 382 (mp)->m_next = (m);\ 383 (mp) = (m);\ 384 }\ 385 } while (0) 386 /* 387 * result: IPv6 hbh dest1 rthdr dest2 payload 388 * m will point to IPv6 header. mprev will point to the 389 * extension header prior to dest2 (rthdr in the above case). 390 */ 391 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 392 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 393 IPPROTO_DSTOPTS); 394 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 395 IPPROTO_ROUTING); 396 } 397 398 /* 399 * If there is a routing header, replace destination address field 400 * with the first hop of the routing header. 401 */ 402 if (exthdrs.ip6e_rthdr) { 403 struct ip6_rthdr *rh; 404 struct ip6_rthdr0 *rh0; 405 struct in6_addr *addr; 406 407 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 408 struct ip6_rthdr *)); 409 finaldst = ip6->ip6_dst; 410 switch (rh->ip6r_type) { 411 case IPV6_RTHDR_TYPE_0: 412 rh0 = (struct ip6_rthdr0 *)rh; 413 addr = (struct in6_addr *)(rh0 + 1); 414 ip6->ip6_dst = addr[0]; 415 bcopy(&addr[1], &addr[0], 416 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 417 addr[rh0->ip6r0_segleft - 1] = finaldst; 418 break; 419 default: /* is it possible? */ 420 error = EINVAL; 421 goto bad; 422 } 423 } 424 425 /* Source address validation */ 426 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 427 (flags & IPV6_UNSPECSRC) == 0) { 428 error = EOPNOTSUPP; 429 ip6stat.ip6s_badscope++; 430 goto bad; 431 } 432 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 433 error = EOPNOTSUPP; 434 ip6stat.ip6s_badscope++; 435 goto bad; 436 } 437 438 ip6stat.ip6s_localout++; 439 440 /* 441 * Route packet. 442 */ 443 if (ro == 0) { 444 ro = &ip6route; 445 bzero((caddr_t)ro, sizeof(*ro)); 446 } 447 ro_pmtu = ro; 448 if (opt && opt->ip6po_rthdr) 449 ro = &opt->ip6po_route; 450 dst = (struct sockaddr_in6 *)&ro->ro_dst; 451 /* 452 * If there is a cached route, 453 * check that it is to the same destination 454 * and is still up. If not, free it and try again. 455 */ 456 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 457 dst->sin6_family != AF_INET6 || 458 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 459 RTFREE(ro->ro_rt); 460 ro->ro_rt = (struct rtentry *)0; 461 } 462 if (ro->ro_rt == 0) { 463 bzero(dst, sizeof(*dst)); 464 dst->sin6_family = AF_INET6; 465 dst->sin6_len = sizeof(struct sockaddr_in6); 466 dst->sin6_addr = ip6->ip6_dst; 467 } 468 #ifdef IPSEC 469 /* 470 * Check if the packet needs encapsulation. 471 * ipsp_process_packet will never come back to here. 472 */ 473 if (sproto != 0) { 474 s = splnet(); 475 476 /* fill in IPv6 header which would be filled later */ 477 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 478 if (opt && opt->ip6po_hlim != -1) 479 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 480 } else { 481 if (im6o != NULL) 482 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 483 else 484 ip6->ip6_hlim = ip6_defmcasthlim; 485 if (opt && opt->ip6po_hlim != -1) 486 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 487 488 /* 489 * XXX what should we do if ip6_hlim == 0 and the 490 * packet gets tunnelled? 491 */ 492 } 493 494 tdb = gettdb(sspi, &sdst, sproto); 495 if (tdb == NULL) { 496 splx(s); 497 error = EHOSTUNREACH; 498 m_freem(m); 499 goto done; 500 } 501 502 /* Latch to PCB */ 503 if (inp) 504 tdb_add_inp(tdb, inp, 0); 505 506 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 507 508 /* Callee frees mbuf */ 509 error = ipsp_process_packet(m, tdb, AF_INET6, 0); 510 splx(s); 511 return error; /* Nothing more to be done */ 512 } 513 #endif /* IPSEC */ 514 515 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 516 /* Unicast */ 517 518 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 519 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 520 /* xxx 521 * interface selection comes here 522 * if an interface is specified from an upper layer, 523 * ifp must point it. 524 */ 525 if (ro->ro_rt == 0) { 526 /* 527 * non-bsdi always clone routes, if parent is 528 * PRF_CLONING. 529 */ 530 rtalloc((struct route *)ro); 531 } 532 if (ro->ro_rt == 0) { 533 ip6stat.ip6s_noroute++; 534 error = EHOSTUNREACH; 535 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 536 goto bad; 537 } 538 ia = ifatoia6(ro->ro_rt->rt_ifa); 539 ifp = ro->ro_rt->rt_ifp; 540 ro->ro_rt->rt_use++; 541 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 542 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 543 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 544 545 in6_ifstat_inc(ifp, ifs6_out_request); 546 547 /* 548 * Check if the outgoing interface conflicts with 549 * the interface specified by ifi6_ifindex (if specified). 550 * Note that loopback interface is always okay. 551 * (this may happen when we are sending a packet to one of 552 * our own addresses.) 553 */ 554 if (opt && opt->ip6po_pktinfo 555 && opt->ip6po_pktinfo->ipi6_ifindex) { 556 if (!(ifp->if_flags & IFF_LOOPBACK) 557 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 558 ip6stat.ip6s_noroute++; 559 in6_ifstat_inc(ifp, ifs6_out_discard); 560 error = EHOSTUNREACH; 561 goto bad; 562 } 563 } 564 565 if (opt && opt->ip6po_hlim != -1) 566 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 567 } else { 568 /* Multicast */ 569 struct in6_multi *in6m; 570 571 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 572 573 /* 574 * See if the caller provided any multicast options 575 */ 576 ifp = NULL; 577 if (im6o != NULL) { 578 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 579 if (im6o->im6o_multicast_ifp != NULL) 580 ifp = im6o->im6o_multicast_ifp; 581 } else 582 ip6->ip6_hlim = ip6_defmcasthlim; 583 584 /* 585 * See if the caller provided the outgoing interface 586 * as an ancillary data. 587 * Boundary check for ifindex is assumed to be already done. 588 */ 589 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 590 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 591 592 /* 593 * If the destination is a node-local scope multicast, 594 * the packet should be loop-backed only. 595 */ 596 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 597 /* 598 * If the outgoing interface is already specified, 599 * it should be a loopback interface. 600 */ 601 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 602 ip6stat.ip6s_badscope++; 603 error = ENETUNREACH; /* XXX: better error? */ 604 /* XXX correct ifp? */ 605 in6_ifstat_inc(ifp, ifs6_out_discard); 606 goto bad; 607 } else { 608 ifp = lo0ifp; 609 } 610 } 611 612 if (opt && opt->ip6po_hlim != -1) 613 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 614 615 /* 616 * If caller did not provide an interface lookup a 617 * default in the routing table. This is either a 618 * default for the speicfied group (i.e. a host 619 * route), or a multicast default (a route for the 620 * ``net'' ff00::/8). 621 */ 622 if (ifp == NULL) { 623 if (ro->ro_rt == 0) { 624 ro->ro_rt = rtalloc1((struct sockaddr *) 625 &ro->ro_dst, 0); 626 } 627 if (ro->ro_rt == 0) { 628 ip6stat.ip6s_noroute++; 629 error = EHOSTUNREACH; 630 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 631 goto bad; 632 } 633 ia = ifatoia6(ro->ro_rt->rt_ifa); 634 ifp = ro->ro_rt->rt_ifp; 635 ro->ro_rt->rt_use++; 636 } 637 638 if ((flags & IPV6_FORWARDING) == 0) 639 in6_ifstat_inc(ifp, ifs6_out_request); 640 in6_ifstat_inc(ifp, ifs6_out_mcast); 641 642 /* 643 * Confirm that the outgoing interface supports multicast. 644 */ 645 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 646 ip6stat.ip6s_noroute++; 647 in6_ifstat_inc(ifp, ifs6_out_discard); 648 error = ENETUNREACH; 649 goto bad; 650 } 651 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 652 if (in6m != NULL && 653 (im6o == NULL || im6o->im6o_multicast_loop)) { 654 /* 655 * If we belong to the destination multicast group 656 * on the outgoing interface, and the caller did not 657 * forbid loopback, loop back a copy. 658 */ 659 ip6_mloopback(ifp, m, dst); 660 } else { 661 /* 662 * If we are acting as a multicast router, perform 663 * multicast forwarding as if the packet had just 664 * arrived on the interface to which we are about 665 * to send. The multicast forwarding function 666 * recursively calls this function, using the 667 * IPV6_FORWARDING flag to prevent infinite recursion. 668 * 669 * Multicasts that are looped back by ip6_mloopback(), 670 * above, will be forwarded by the ip6_input() routine, 671 * if necessary. 672 */ 673 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 674 if (ip6_mforward(ip6, ifp, m) != 0) { 675 m_freem(m); 676 goto done; 677 } 678 } 679 } 680 /* 681 * Multicasts with a hoplimit of zero may be looped back, 682 * above, but must not be transmitted on a network. 683 * Also, multicasts addressed to the loopback interface 684 * are not sent -- the above call to ip6_mloopback() will 685 * loop back a copy if this host actually belongs to the 686 * destination group on the loopback interface. 687 */ 688 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 689 m_freem(m); 690 goto done; 691 } 692 } 693 694 /* 695 * Fill the outgoing inteface to tell the upper layer 696 * to increment per-interface statistics. 697 */ 698 if (ifpp) 699 *ifpp = ifp; 700 701 /* Determine path MTU. */ 702 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu)) != 0) 703 goto bad; 704 705 /* 706 * The caller of this function may specify to use the minimum MTU 707 * in some cases. 708 */ 709 if (mtu > IPV6_MMTU) { 710 if ((flags & IPV6_MINMTU)) 711 mtu = IPV6_MMTU; 712 } 713 714 /* Fake scoped addresses */ 715 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 716 /* 717 * If source or destination address is a scoped address, and 718 * the packet is going to be sent to a loopback interface, 719 * we should keep the original interface. 720 */ 721 722 /* 723 * XXX: this is a very experimental and temporary solution. 724 * We eventually have sockaddr_in6 and use the sin6_scope_id 725 * field of the structure here. 726 * We rely on the consistency between two scope zone ids 727 * of source add destination, which should already be assured 728 * Larger scopes than link will be supported in the near 729 * future. 730 */ 731 origifp = NULL; 732 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 733 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 734 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 735 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 736 /* 737 * XXX: origifp can be NULL even in those two cases above. 738 * For example, if we remove the (only) link-local address 739 * from the loopback interface, and try to send a link-local 740 * address without link-id information. Then the source 741 * address is ::1, and the destination address is the 742 * link-local address with its s6_addr16[1] being zero. 743 * What is worse, if the packet goes to the loopback interface 744 * by a default rejected route, the null pointer would be 745 * passed to looutput, and the kernel would hang. 746 * The following last resort would prevent such disaster. 747 */ 748 if (origifp == NULL) 749 origifp = ifp; 750 } else 751 origifp = ifp; 752 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 753 ip6->ip6_src.s6_addr16[1] = 0; 754 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 755 ip6->ip6_dst.s6_addr16[1] = 0; 756 757 /* 758 * If the outgoing packet contains a hop-by-hop options header, 759 * it must be examined and processed even by the source node. 760 * (RFC 2460, section 4.) 761 */ 762 if (exthdrs.ip6e_hbh) { 763 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 764 u_int32_t dummy1; /* XXX unused */ 765 u_int32_t dummy2; /* XXX unused */ 766 767 /* 768 * XXX: if we have to send an ICMPv6 error to the sender, 769 * we need the M_LOOP flag since icmp6_error() expects 770 * the IPv6 and the hop-by-hop options header are 771 * continuous unless the flag is set. 772 */ 773 m->m_flags |= M_LOOP; 774 m->m_pkthdr.rcvif = ifp; 775 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 776 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 777 &dummy1, &dummy2) < 0) { 778 /* m was already freed at this point */ 779 error = EINVAL;/* better error? */ 780 goto done; 781 } 782 m->m_flags &= ~M_LOOP; /* XXX */ 783 m->m_pkthdr.rcvif = NULL; 784 } 785 786 #if NPF > 0 787 if (pf_test6(PF_OUT, ifp, &m) != PF_PASS) { 788 error = EHOSTUNREACH; 789 m_freem(m); 790 goto done; 791 } 792 if (m == NULL) 793 goto done; 794 ip6 = mtod(m, struct ip6_hdr *); 795 #endif 796 797 /* 798 * Send the packet to the outgoing interface. 799 * If necessary, do IPv6 fragmentation before sending. 800 */ 801 tlen = m->m_pkthdr.len; 802 if (tlen <= mtu) { 803 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 804 goto done; 805 } else if (mtu < IPV6_MMTU) { 806 /* 807 * note that path MTU is never less than IPV6_MMTU 808 * (see icmp6_input). 809 */ 810 error = EMSGSIZE; 811 in6_ifstat_inc(ifp, ifs6_out_fragfail); 812 goto bad; 813 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 814 error = EMSGSIZE; 815 in6_ifstat_inc(ifp, ifs6_out_fragfail); 816 goto bad; 817 } else { 818 struct mbuf **mnext, *m_frgpart; 819 struct ip6_frag *ip6f; 820 u_int32_t id = htonl(ip6_randomid()); 821 u_char nextproto; 822 823 /* 824 * Too large for the destination or interface; 825 * fragment if possible. 826 * Must be able to put at least 8 bytes per fragment. 827 */ 828 hlen = unfragpartlen; 829 if (mtu > IPV6_MAXPACKET) 830 mtu = IPV6_MAXPACKET; 831 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 832 if (len < 8) { 833 error = EMSGSIZE; 834 in6_ifstat_inc(ifp, ifs6_out_fragfail); 835 goto bad; 836 } 837 838 mnext = &m->m_nextpkt; 839 840 /* 841 * Change the next header field of the last header in the 842 * unfragmentable part. 843 */ 844 if (exthdrs.ip6e_rthdr) { 845 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 846 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 847 } else if (exthdrs.ip6e_dest1) { 848 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 849 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 850 } else if (exthdrs.ip6e_hbh) { 851 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 852 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 853 } else { 854 nextproto = ip6->ip6_nxt; 855 ip6->ip6_nxt = IPPROTO_FRAGMENT; 856 } 857 858 /* 859 * Loop through length of segment after first fragment, 860 * make new header and copy data of each part and link onto 861 * chain. 862 */ 863 m0 = m; 864 for (off = hlen; off < tlen; off += len) { 865 struct mbuf *mlast; 866 867 MGETHDR(m, M_DONTWAIT, MT_HEADER); 868 if (!m) { 869 error = ENOBUFS; 870 ip6stat.ip6s_odropped++; 871 goto sendorfree; 872 } 873 m->m_flags = m0->m_flags & M_COPYFLAGS; 874 *mnext = m; 875 mnext = &m->m_nextpkt; 876 m->m_data += max_linkhdr; 877 mhip6 = mtod(m, struct ip6_hdr *); 878 *mhip6 = *ip6; 879 m->m_len = sizeof(*mhip6); 880 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 881 if (error) { 882 ip6stat.ip6s_odropped++; 883 goto sendorfree; 884 } 885 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 886 if (off + len >= tlen) 887 len = tlen - off; 888 else 889 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 890 mhip6->ip6_plen = htons((u_short)(len + hlen + 891 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 892 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 893 error = ENOBUFS; 894 ip6stat.ip6s_odropped++; 895 goto sendorfree; 896 } 897 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 898 ; 899 mlast->m_next = m_frgpart; 900 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 901 m->m_pkthdr.rcvif = (struct ifnet *)0; 902 ip6f->ip6f_reserved = 0; 903 ip6f->ip6f_ident = id; 904 ip6f->ip6f_nxt = nextproto; 905 ip6stat.ip6s_ofragments++; 906 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 907 } 908 909 in6_ifstat_inc(ifp, ifs6_out_fragok); 910 } 911 912 /* 913 * Remove leading garbages. 914 */ 915 sendorfree: 916 m = m0->m_nextpkt; 917 m0->m_nextpkt = 0; 918 m_freem(m0); 919 for (m0 = m; m; m = m0) { 920 m0 = m->m_nextpkt; 921 m->m_nextpkt = 0; 922 if (error == 0) { 923 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 924 } else 925 m_freem(m); 926 } 927 928 if (error == 0) 929 ip6stat.ip6s_fragmented++; 930 931 done: 932 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 933 RTFREE(ro->ro_rt); 934 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 935 RTFREE(ro_pmtu->ro_rt); 936 } 937 938 return (error); 939 940 freehdrs: 941 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 942 m_freem(exthdrs.ip6e_dest1); 943 m_freem(exthdrs.ip6e_rthdr); 944 m_freem(exthdrs.ip6e_dest2); 945 /* FALLTHROUGH */ 946 bad: 947 m_freem(m); 948 goto done; 949 } 950 951 static int 952 ip6_copyexthdr(mp, hdr, hlen) 953 struct mbuf **mp; 954 caddr_t hdr; 955 int hlen; 956 { 957 struct mbuf *m; 958 959 if (hlen > MCLBYTES) 960 return (ENOBUFS); /* XXX */ 961 962 MGET(m, M_DONTWAIT, MT_DATA); 963 if (!m) 964 return (ENOBUFS); 965 966 if (hlen > MLEN) { 967 MCLGET(m, M_DONTWAIT); 968 if ((m->m_flags & M_EXT) == 0) { 969 m_free(m); 970 return (ENOBUFS); 971 } 972 } 973 m->m_len = hlen; 974 if (hdr) 975 bcopy(hdr, mtod(m, caddr_t), hlen); 976 977 *mp = m; 978 return (0); 979 } 980 981 /* 982 * Insert jumbo payload option. 983 */ 984 static int 985 ip6_insert_jumboopt(exthdrs, plen) 986 struct ip6_exthdrs *exthdrs; 987 u_int32_t plen; 988 { 989 struct mbuf *mopt; 990 u_int8_t *optbuf; 991 u_int32_t v; 992 993 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 994 995 /* 996 * If there is no hop-by-hop options header, allocate new one. 997 * If there is one but it doesn't have enough space to store the 998 * jumbo payload option, allocate a cluster to store the whole options. 999 * Otherwise, use it to store the options. 1000 */ 1001 if (exthdrs->ip6e_hbh == 0) { 1002 MGET(mopt, M_DONTWAIT, MT_DATA); 1003 if (mopt == 0) 1004 return (ENOBUFS); 1005 mopt->m_len = JUMBOOPTLEN; 1006 optbuf = mtod(mopt, u_int8_t *); 1007 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1008 exthdrs->ip6e_hbh = mopt; 1009 } else { 1010 struct ip6_hbh *hbh; 1011 1012 mopt = exthdrs->ip6e_hbh; 1013 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1014 /* 1015 * XXX assumption: 1016 * - exthdrs->ip6e_hbh is not referenced from places 1017 * other than exthdrs. 1018 * - exthdrs->ip6e_hbh is not an mbuf chain. 1019 */ 1020 int oldoptlen = mopt->m_len; 1021 struct mbuf *n; 1022 1023 /* 1024 * XXX: give up if the whole (new) hbh header does 1025 * not fit even in an mbuf cluster. 1026 */ 1027 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1028 return (ENOBUFS); 1029 1030 /* 1031 * As a consequence, we must always prepare a cluster 1032 * at this point. 1033 */ 1034 MGET(n, M_DONTWAIT, MT_DATA); 1035 if (n) { 1036 MCLGET(n, M_DONTWAIT); 1037 if ((n->m_flags & M_EXT) == 0) { 1038 m_freem(n); 1039 n = NULL; 1040 } 1041 } 1042 if (!n) 1043 return (ENOBUFS); 1044 n->m_len = oldoptlen + JUMBOOPTLEN; 1045 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1046 oldoptlen); 1047 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1048 m_freem(mopt); 1049 mopt = exthdrs->ip6e_hbh = n; 1050 } else { 1051 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1052 mopt->m_len += JUMBOOPTLEN; 1053 } 1054 optbuf[0] = IP6OPT_PADN; 1055 optbuf[1] = 0; 1056 1057 /* 1058 * Adjust the header length according to the pad and 1059 * the jumbo payload option. 1060 */ 1061 hbh = mtod(mopt, struct ip6_hbh *); 1062 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1063 } 1064 1065 /* fill in the option. */ 1066 optbuf[2] = IP6OPT_JUMBO; 1067 optbuf[3] = 4; 1068 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1069 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1070 1071 /* finally, adjust the packet header length */ 1072 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1073 1074 return (0); 1075 #undef JUMBOOPTLEN 1076 } 1077 1078 /* 1079 * Insert fragment header and copy unfragmentable header portions. 1080 */ 1081 static int 1082 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1083 struct mbuf *m0, *m; 1084 int hlen; 1085 struct ip6_frag **frghdrp; 1086 { 1087 struct mbuf *n, *mlast; 1088 1089 if (hlen > sizeof(struct ip6_hdr)) { 1090 n = m_copym(m0, sizeof(struct ip6_hdr), 1091 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1092 if (n == 0) 1093 return (ENOBUFS); 1094 m->m_next = n; 1095 } else 1096 n = m; 1097 1098 /* Search for the last mbuf of unfragmentable part. */ 1099 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1100 ; 1101 1102 if ((mlast->m_flags & M_EXT) == 0 && 1103 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1104 /* use the trailing space of the last mbuf for the fragment hdr */ 1105 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1106 mlast->m_len); 1107 mlast->m_len += sizeof(struct ip6_frag); 1108 m->m_pkthdr.len += sizeof(struct ip6_frag); 1109 } else { 1110 /* allocate a new mbuf for the fragment header */ 1111 struct mbuf *mfrg; 1112 1113 MGET(mfrg, M_DONTWAIT, MT_DATA); 1114 if (mfrg == 0) 1115 return (ENOBUFS); 1116 mfrg->m_len = sizeof(struct ip6_frag); 1117 *frghdrp = mtod(mfrg, struct ip6_frag *); 1118 mlast->m_next = mfrg; 1119 } 1120 1121 return (0); 1122 } 1123 1124 static int 1125 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup) 1126 struct route_in6 *ro_pmtu, *ro; 1127 struct ifnet *ifp; 1128 struct in6_addr *dst; 1129 u_long *mtup; 1130 { 1131 u_int32_t mtu = 0; 1132 int error = 0; 1133 1134 if (ro_pmtu != ro) { 1135 /* The first hop and the final destination may differ. */ 1136 struct sockaddr_in6 *sa6_dst = 1137 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1138 if (ro_pmtu->ro_rt && 1139 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1140 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1141 RTFREE(ro_pmtu->ro_rt); 1142 ro_pmtu->ro_rt = (struct rtentry *)0; 1143 } 1144 if (ro_pmtu->ro_rt == 0) { 1145 bzero(sa6_dst, sizeof(*sa6_dst)); 1146 sa6_dst->sin6_family = AF_INET6; 1147 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1148 sa6_dst->sin6_addr = *dst; 1149 1150 rtalloc((struct route *)ro_pmtu); 1151 } 1152 } 1153 if (ro_pmtu->ro_rt) { 1154 u_int32_t ifmtu; 1155 1156 if (ifp == NULL) 1157 ifp = ro_pmtu->ro_rt->rt_ifp; 1158 ifmtu = IN6_LINKMTU(ifp); 1159 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1160 if (mtu == 0) 1161 mtu = ifmtu; 1162 else if (mtu > ifmtu) { 1163 /* 1164 * The MTU on the route is larger than the MTU on 1165 * the interface! This shouldn't happen, unless the 1166 * MTU of the interface has been changed after the 1167 * interface was brought up. Change the MTU in the 1168 * route to match the interface MTU (as long as the 1169 * field isn't locked). 1170 * 1171 * if MTU on the route is 0, we need to fix the MTU. 1172 * this case happens with path MTU discovery timeouts. 1173 */ 1174 mtu = ifmtu; 1175 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1176 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1177 } 1178 } else if (ifp) { 1179 mtu = IN6_LINKMTU(ifp); 1180 } else 1181 error = EHOSTUNREACH; /* XXX */ 1182 1183 *mtup = mtu; 1184 return (error); 1185 } 1186 1187 /* 1188 * IP6 socket option processing. 1189 */ 1190 int 1191 ip6_ctloutput(op, so, level, optname, mp) 1192 int op; 1193 struct socket *so; 1194 int level, optname; 1195 struct mbuf **mp; 1196 { 1197 int privileged; 1198 struct inpcb *inp = sotoinpcb(so); 1199 struct mbuf *m = *mp; 1200 int error, optval; 1201 int optlen; 1202 #ifdef IPSEC 1203 struct proc *p = curproc; /* XXX */ 1204 struct tdb *tdb; 1205 struct tdb_ident *tdbip, tdbi; 1206 int s; 1207 #endif 1208 1209 optlen = m ? m->m_len : 0; 1210 error = optval = 0; 1211 1212 privileged = (inp->inp_socket->so_state & SS_PRIV); 1213 1214 if (level == IPPROTO_IPV6) { 1215 switch (op) { 1216 case PRCO_SETOPT: 1217 switch (optname) { 1218 case IPV6_PKTOPTIONS: 1219 /* m is freed in ip6_pcbopts */ 1220 return (ip6_pcbopts(&inp->inp_outputopts6, 1221 m, so)); 1222 case IPV6_HOPOPTS: 1223 case IPV6_DSTOPTS: 1224 if (!privileged) { 1225 error = EPERM; 1226 break; 1227 } 1228 /* FALLTHROUGH */ 1229 case IPV6_UNICAST_HOPS: 1230 case IPV6_RECVOPTS: 1231 case IPV6_RECVRETOPTS: 1232 case IPV6_RECVDSTADDR: 1233 case IPV6_PKTINFO: 1234 case IPV6_HOPLIMIT: 1235 case IPV6_RTHDR: 1236 case IPV6_FAITH: 1237 case IPV6_V6ONLY: 1238 if (optlen != sizeof(int)) { 1239 error = EINVAL; 1240 break; 1241 } 1242 optval = *mtod(m, int *); 1243 switch (optname) { 1244 1245 case IPV6_UNICAST_HOPS: 1246 if (optval < -1 || optval >= 256) 1247 error = EINVAL; 1248 else { 1249 /* -1 = kernel default */ 1250 inp->inp_hops = optval; 1251 } 1252 break; 1253 #define OPTSET(bit) \ 1254 do { \ 1255 if (optval) \ 1256 inp->inp_flags |= (bit); \ 1257 else \ 1258 inp->inp_flags &= ~(bit); \ 1259 } while (0) 1260 case IPV6_RECVOPTS: 1261 OPTSET(IN6P_RECVOPTS); 1262 break; 1263 1264 case IPV6_RECVRETOPTS: 1265 OPTSET(IN6P_RECVRETOPTS); 1266 break; 1267 1268 case IPV6_RECVDSTADDR: 1269 OPTSET(IN6P_RECVDSTADDR); 1270 break; 1271 1272 case IPV6_PKTINFO: 1273 OPTSET(IN6P_PKTINFO); 1274 break; 1275 1276 case IPV6_HOPLIMIT: 1277 OPTSET(IN6P_HOPLIMIT); 1278 break; 1279 1280 case IPV6_HOPOPTS: 1281 OPTSET(IN6P_HOPOPTS); 1282 break; 1283 1284 case IPV6_DSTOPTS: 1285 OPTSET(IN6P_DSTOPTS); 1286 break; 1287 1288 case IPV6_RTHDR: 1289 OPTSET(IN6P_RTHDR); 1290 break; 1291 1292 case IPV6_FAITH: 1293 OPTSET(IN6P_FAITH); 1294 break; 1295 1296 case IPV6_V6ONLY: 1297 if (!optval) 1298 error = EINVAL; 1299 break; 1300 } 1301 break; 1302 #undef OPTSET 1303 1304 case IPV6_MULTICAST_IF: 1305 case IPV6_MULTICAST_HOPS: 1306 case IPV6_MULTICAST_LOOP: 1307 case IPV6_JOIN_GROUP: 1308 case IPV6_LEAVE_GROUP: 1309 error = ip6_setmoptions(optname, 1310 &inp->inp_moptions6, m); 1311 break; 1312 1313 case IPV6_PORTRANGE: 1314 optval = *mtod(m, int *); 1315 1316 switch (optval) { 1317 case IPV6_PORTRANGE_DEFAULT: 1318 inp->inp_flags &= ~(IN6P_LOWPORT); 1319 inp->inp_flags &= ~(IN6P_HIGHPORT); 1320 break; 1321 1322 case IPV6_PORTRANGE_HIGH: 1323 inp->inp_flags &= ~(IN6P_LOWPORT); 1324 inp->inp_flags |= IN6P_HIGHPORT; 1325 break; 1326 1327 case IPV6_PORTRANGE_LOW: 1328 inp->inp_flags &= ~(IN6P_HIGHPORT); 1329 inp->inp_flags |= IN6P_LOWPORT; 1330 break; 1331 1332 default: 1333 error = EINVAL; 1334 break; 1335 } 1336 break; 1337 1338 case IPSEC6_OUTSA: 1339 #ifndef IPSEC 1340 error = EINVAL; 1341 #else 1342 s = spltdb(); 1343 if (m == 0 || m->m_len != sizeof(struct tdb_ident)) { 1344 error = EINVAL; 1345 } else { 1346 tdbip = mtod(m, struct tdb_ident *); 1347 tdb = gettdb(tdbip->spi, &tdbip->dst, 1348 tdbip->proto); 1349 if (tdb == NULL) 1350 error = ESRCH; 1351 else 1352 tdb_add_inp(tdb, inp, 0); 1353 } 1354 splx(s); 1355 #endif /* IPSEC */ 1356 break; 1357 1358 case IPV6_AUTH_LEVEL: 1359 case IPV6_ESP_TRANS_LEVEL: 1360 case IPV6_ESP_NETWORK_LEVEL: 1361 case IPV6_IPCOMP_LEVEL: 1362 #ifndef IPSEC 1363 error = EINVAL; 1364 #else 1365 if (m == 0 || m->m_len != sizeof(int)) { 1366 error = EINVAL; 1367 break; 1368 } 1369 optval = *mtod(m, int *); 1370 1371 if (optval < IPSEC_LEVEL_BYPASS || 1372 optval > IPSEC_LEVEL_UNIQUE) { 1373 error = EINVAL; 1374 break; 1375 } 1376 1377 switch (optname) { 1378 case IPV6_AUTH_LEVEL: 1379 if (optval < ipsec_auth_default_level && 1380 suser(p, 0)) { 1381 error = EACCES; 1382 break; 1383 } 1384 inp->inp_seclevel[SL_AUTH] = optval; 1385 break; 1386 1387 case IPV6_ESP_TRANS_LEVEL: 1388 if (optval < ipsec_esp_trans_default_level && 1389 suser(p, 0)) { 1390 error = EACCES; 1391 break; 1392 } 1393 inp->inp_seclevel[SL_ESP_TRANS] = optval; 1394 break; 1395 1396 case IPV6_ESP_NETWORK_LEVEL: 1397 if (optval < ipsec_esp_network_default_level && 1398 suser(p, 0)) { 1399 error = EACCES; 1400 break; 1401 } 1402 inp->inp_seclevel[SL_ESP_NETWORK] = optval; 1403 break; 1404 1405 case IPV6_IPCOMP_LEVEL: 1406 if (optval < ipsec_ipcomp_default_level && 1407 suser(p, 0)) { 1408 error = EACCES; 1409 break; 1410 } 1411 inp->inp_seclevel[SL_IPCOMP] = optval; 1412 break; 1413 } 1414 if (!error) 1415 inp->inp_secrequire = get_sa_require(inp); 1416 #endif 1417 break; 1418 1419 1420 default: 1421 error = ENOPROTOOPT; 1422 break; 1423 } 1424 if (m) 1425 (void)m_free(m); 1426 break; 1427 1428 case PRCO_GETOPT: 1429 switch (optname) { 1430 1431 case IPV6_OPTIONS: 1432 case IPV6_RETOPTS: 1433 error = ENOPROTOOPT; 1434 break; 1435 1436 case IPV6_PKTOPTIONS: 1437 if (inp->inp_options) { 1438 *mp = m_copym(inp->inp_options, 0, 1439 M_COPYALL, M_WAIT); 1440 } else { 1441 *mp = m_get(M_WAIT, MT_SOOPTS); 1442 (*mp)->m_len = 0; 1443 } 1444 break; 1445 1446 case IPV6_HOPOPTS: 1447 case IPV6_DSTOPTS: 1448 if (!privileged) { 1449 error = EPERM; 1450 break; 1451 } 1452 /* FALLTHROUGH */ 1453 case IPV6_UNICAST_HOPS: 1454 case IPV6_RECVOPTS: 1455 case IPV6_RECVRETOPTS: 1456 case IPV6_RECVDSTADDR: 1457 case IPV6_PKTINFO: 1458 case IPV6_HOPLIMIT: 1459 case IPV6_RTHDR: 1460 case IPV6_FAITH: 1461 case IPV6_V6ONLY: 1462 case IPV6_PORTRANGE: 1463 switch (optname) { 1464 1465 case IPV6_UNICAST_HOPS: 1466 optval = inp->inp_hops; 1467 break; 1468 1469 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1470 1471 case IPV6_RECVOPTS: 1472 optval = OPTBIT(IN6P_RECVOPTS); 1473 break; 1474 1475 case IPV6_RECVRETOPTS: 1476 optval = OPTBIT(IN6P_RECVRETOPTS); 1477 break; 1478 1479 case IPV6_RECVDSTADDR: 1480 optval = OPTBIT(IN6P_RECVDSTADDR); 1481 break; 1482 1483 case IPV6_PKTINFO: 1484 optval = OPTBIT(IN6P_PKTINFO); 1485 break; 1486 1487 case IPV6_HOPLIMIT: 1488 optval = OPTBIT(IN6P_HOPLIMIT); 1489 break; 1490 1491 case IPV6_HOPOPTS: 1492 optval = OPTBIT(IN6P_HOPOPTS); 1493 break; 1494 1495 case IPV6_DSTOPTS: 1496 optval = OPTBIT(IN6P_DSTOPTS); 1497 break; 1498 1499 case IPV6_RTHDR: 1500 optval = OPTBIT(IN6P_RTHDR); 1501 break; 1502 1503 case IPV6_FAITH: 1504 optval = OPTBIT(IN6P_FAITH); 1505 break; 1506 1507 case IPV6_V6ONLY: 1508 optval = (ip6_v6only != 0); /* XXX */ 1509 break; 1510 1511 case IPV6_PORTRANGE: 1512 { 1513 int flags; 1514 1515 flags = inp->inp_flags; 1516 if (flags & IN6P_HIGHPORT) 1517 optval = IPV6_PORTRANGE_HIGH; 1518 else if (flags & IN6P_LOWPORT) 1519 optval = IPV6_PORTRANGE_LOW; 1520 else 1521 optval = 0; 1522 break; 1523 } 1524 } 1525 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1526 m->m_len = sizeof(int); 1527 *mtod(m, int *) = optval; 1528 break; 1529 1530 case IPV6_MULTICAST_IF: 1531 case IPV6_MULTICAST_HOPS: 1532 case IPV6_MULTICAST_LOOP: 1533 case IPV6_JOIN_GROUP: 1534 case IPV6_LEAVE_GROUP: 1535 error = ip6_getmoptions(optname, inp->inp_moptions6, mp); 1536 break; 1537 1538 case IPSEC6_OUTSA: 1539 #ifndef IPSEC 1540 error = EINVAL; 1541 #else 1542 s = spltdb(); 1543 if (inp->inp_tdb_out == NULL) { 1544 error = ENOENT; 1545 } else { 1546 tdbi.spi = inp->inp_tdb_out->tdb_spi; 1547 tdbi.dst = inp->inp_tdb_out->tdb_dst; 1548 tdbi.proto = inp->inp_tdb_out->tdb_sproto; 1549 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1550 m->m_len = sizeof(tdbi); 1551 bcopy((caddr_t)&tdbi, mtod(m, caddr_t), 1552 (unsigned)m->m_len); 1553 } 1554 splx(s); 1555 #endif /* IPSEC */ 1556 break; 1557 1558 case IPV6_AUTH_LEVEL: 1559 case IPV6_ESP_TRANS_LEVEL: 1560 case IPV6_ESP_NETWORK_LEVEL: 1561 case IPV6_IPCOMP_LEVEL: 1562 #ifndef IPSEC 1563 m->m_len = sizeof(int); 1564 *mtod(m, int *) = IPSEC_LEVEL_NONE; 1565 #else 1566 m->m_len = sizeof(int); 1567 switch (optname) { 1568 case IPV6_AUTH_LEVEL: 1569 optval = inp->inp_seclevel[SL_AUTH]; 1570 break; 1571 1572 case IPV6_ESP_TRANS_LEVEL: 1573 optval = 1574 inp->inp_seclevel[SL_ESP_TRANS]; 1575 break; 1576 1577 case IPV6_ESP_NETWORK_LEVEL: 1578 optval = 1579 inp->inp_seclevel[SL_ESP_NETWORK]; 1580 break; 1581 1582 case IPV6_IPCOMP_LEVEL: 1583 optval = inp->inp_seclevel[SL_IPCOMP]; 1584 break; 1585 } 1586 *mtod(m, int *) = optval; 1587 #endif 1588 break; 1589 1590 default: 1591 error = ENOPROTOOPT; 1592 break; 1593 } 1594 break; 1595 } 1596 } else { 1597 error = EINVAL; 1598 if (op == PRCO_SETOPT && *mp) 1599 (void)m_free(*mp); 1600 } 1601 return (error); 1602 } 1603 1604 int 1605 ip6_raw_ctloutput(op, so, level, optname, mp) 1606 int op; 1607 struct socket *so; 1608 int level, optname; 1609 struct mbuf **mp; 1610 { 1611 int error = 0, optval, optlen; 1612 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1613 struct inpcb *inp = sotoinpcb(so); 1614 struct mbuf *m = *mp; 1615 1616 optlen = m ? m->m_len : 0; 1617 1618 if (level != IPPROTO_IPV6) { 1619 if (op == PRCO_SETOPT && *mp) 1620 (void)m_free(*mp); 1621 return (EINVAL); 1622 } 1623 1624 switch (optname) { 1625 case IPV6_CHECKSUM: 1626 /* 1627 * For ICMPv6 sockets, no modification allowed for checksum 1628 * offset, permit "no change" values to help existing apps. 1629 * 1630 * XXX 2292bis says: "An attempt to set IPV6_CHECKSUM 1631 * for an ICMPv6 socket will fail." 1632 * The current behavior does not meet 2292bis. 1633 */ 1634 switch (op) { 1635 case PRCO_SETOPT: 1636 if (optlen != sizeof(int)) { 1637 error = EINVAL; 1638 break; 1639 } 1640 optval = *mtod(m, int *); 1641 if ((optval % 2) != 0) { 1642 /* the API assumes even offset values */ 1643 error = EINVAL; 1644 } else if (so->so_proto->pr_protocol == 1645 IPPROTO_ICMPV6) { 1646 if (optval != icmp6off) 1647 error = EINVAL; 1648 } else 1649 inp->in6p_cksum = optval; 1650 break; 1651 1652 case PRCO_GETOPT: 1653 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1654 optval = icmp6off; 1655 else 1656 optval = inp->in6p_cksum; 1657 1658 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1659 m->m_len = sizeof(int); 1660 *mtod(m, int *) = optval; 1661 break; 1662 1663 default: 1664 error = EINVAL; 1665 break; 1666 } 1667 break; 1668 1669 default: 1670 error = ENOPROTOOPT; 1671 break; 1672 } 1673 1674 if (op == PRCO_SETOPT && m) 1675 (void)m_free(m); 1676 1677 return (error); 1678 } 1679 1680 /* 1681 * Set up IP6 options in pcb for insertion in output packets. 1682 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1683 * with destination address if source routed. 1684 */ 1685 static int 1686 ip6_pcbopts(pktopt, m, so) 1687 struct ip6_pktopts **pktopt; 1688 struct mbuf *m; 1689 struct socket *so; 1690 { 1691 struct ip6_pktopts *opt = *pktopt; 1692 int error = 0; 1693 struct proc *p = curproc; /* XXX */ 1694 int priv = 0; 1695 1696 /* turn off any old options. */ 1697 if (opt) { 1698 if (opt->ip6po_m) 1699 (void)m_free(opt->ip6po_m); 1700 } else 1701 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1702 *pktopt = 0; 1703 1704 if (!m || m->m_len == 0) { 1705 /* 1706 * Only turning off any previous options. 1707 */ 1708 free(opt, M_IP6OPT); 1709 if (m) 1710 (void)m_free(m); 1711 return (0); 1712 } 1713 1714 /* set options specified by user. */ 1715 if (p && !suser(p, 0)) 1716 priv = 1; 1717 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1718 (void)m_free(m); 1719 free(opt, M_IP6OPT); 1720 return (error); 1721 } 1722 *pktopt = opt; 1723 return (0); 1724 } 1725 1726 /* 1727 * Set the IP6 multicast options in response to user setsockopt(). 1728 */ 1729 static int 1730 ip6_setmoptions(optname, im6op, m) 1731 int optname; 1732 struct ip6_moptions **im6op; 1733 struct mbuf *m; 1734 { 1735 int error = 0; 1736 u_int loop, ifindex; 1737 struct ipv6_mreq *mreq; 1738 struct ifnet *ifp; 1739 struct ip6_moptions *im6o = *im6op; 1740 struct route_in6 ro; 1741 struct sockaddr_in6 *dst; 1742 struct in6_multi_mship *imm; 1743 struct proc *p = curproc; /* XXX */ 1744 1745 if (im6o == NULL) { 1746 /* 1747 * No multicast option buffer attached to the pcb; 1748 * allocate one and initialize to default values. 1749 */ 1750 im6o = (struct ip6_moptions *) 1751 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1752 1753 if (im6o == NULL) 1754 return (ENOBUFS); 1755 *im6op = im6o; 1756 im6o->im6o_multicast_ifp = NULL; 1757 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1758 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1759 LIST_INIT(&im6o->im6o_memberships); 1760 } 1761 1762 switch (optname) { 1763 1764 case IPV6_MULTICAST_IF: 1765 /* 1766 * Select the interface for outgoing multicast packets. 1767 */ 1768 if (m == NULL || m->m_len != sizeof(u_int)) { 1769 error = EINVAL; 1770 break; 1771 } 1772 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1773 if (ifindex < 0 || if_index < ifindex) { 1774 error = ENXIO; /* XXX EINVAL? */ 1775 break; 1776 } 1777 ifp = ifindex2ifnet[ifindex]; 1778 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1779 error = EADDRNOTAVAIL; 1780 break; 1781 } 1782 im6o->im6o_multicast_ifp = ifp; 1783 break; 1784 1785 case IPV6_MULTICAST_HOPS: 1786 { 1787 /* 1788 * Set the IP6 hoplimit for outgoing multicast packets. 1789 */ 1790 int optval; 1791 if (m == NULL || m->m_len != sizeof(int)) { 1792 error = EINVAL; 1793 break; 1794 } 1795 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1796 if (optval < -1 || optval >= 256) 1797 error = EINVAL; 1798 else if (optval == -1) 1799 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1800 else 1801 im6o->im6o_multicast_hlim = optval; 1802 break; 1803 } 1804 1805 case IPV6_MULTICAST_LOOP: 1806 /* 1807 * Set the loopback flag for outgoing multicast packets. 1808 * Must be zero or one. 1809 */ 1810 if (m == NULL || m->m_len != sizeof(u_int)) { 1811 error = EINVAL; 1812 break; 1813 } 1814 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1815 if (loop > 1) { 1816 error = EINVAL; 1817 break; 1818 } 1819 im6o->im6o_multicast_loop = loop; 1820 break; 1821 1822 case IPV6_JOIN_GROUP: 1823 /* 1824 * Add a multicast group membership. 1825 * Group must be a valid IP6 multicast address. 1826 */ 1827 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1828 error = EINVAL; 1829 break; 1830 } 1831 mreq = mtod(m, struct ipv6_mreq *); 1832 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1833 /* 1834 * We use the unspecified address to specify to accept 1835 * all multicast addresses. Only super user is allowed 1836 * to do this. 1837 */ 1838 if (suser(p, 0)) 1839 { 1840 error = EACCES; 1841 break; 1842 } 1843 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1844 error = EINVAL; 1845 break; 1846 } 1847 1848 /* 1849 * If the interface is specified, validate it. 1850 */ 1851 if (mreq->ipv6mr_interface < 0 || 1852 if_index < mreq->ipv6mr_interface) { 1853 error = ENXIO; /* XXX EINVAL? */ 1854 break; 1855 } 1856 /* 1857 * If no interface was explicitly specified, choose an 1858 * appropriate one according to the given multicast address. 1859 */ 1860 if (mreq->ipv6mr_interface == 0) { 1861 /* 1862 * If the multicast address is in node-local scope, 1863 * the interface should be a loopback interface. 1864 * Otherwise, look up the routing table for the 1865 * address, and choose the outgoing interface. 1866 * XXX: is it a good approach? 1867 */ 1868 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1869 ifp = lo0ifp; 1870 } else { 1871 ro.ro_rt = NULL; 1872 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1873 bzero(dst, sizeof(*dst)); 1874 dst->sin6_len = sizeof(struct sockaddr_in6); 1875 dst->sin6_family = AF_INET6; 1876 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1877 rtalloc((struct route *)&ro); 1878 if (ro.ro_rt == NULL) { 1879 error = EADDRNOTAVAIL; 1880 break; 1881 } 1882 ifp = ro.ro_rt->rt_ifp; 1883 rtfree(ro.ro_rt); 1884 } 1885 } else 1886 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1887 1888 /* 1889 * See if we found an interface, and confirm that it 1890 * supports multicast 1891 */ 1892 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1893 error = EADDRNOTAVAIL; 1894 break; 1895 } 1896 /* 1897 * Put interface index into the multicast address, 1898 * if the address has link-local scope. 1899 */ 1900 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1901 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1902 htons(ifp->if_index); 1903 } 1904 /* 1905 * See if the membership already exists. 1906 */ 1907 for (imm = im6o->im6o_memberships.lh_first; 1908 imm != NULL; imm = imm->i6mm_chain.le_next) 1909 if (imm->i6mm_maddr->in6m_ifp == ifp && 1910 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1911 &mreq->ipv6mr_multiaddr)) 1912 break; 1913 if (imm != NULL) { 1914 error = EADDRINUSE; 1915 break; 1916 } 1917 /* 1918 * Everything looks good; add a new record to the multicast 1919 * address list for the given interface. 1920 */ 1921 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1922 if (!imm) 1923 break; 1924 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1925 break; 1926 1927 case IPV6_LEAVE_GROUP: 1928 /* 1929 * Drop a multicast group membership. 1930 * Group must be a valid IP6 multicast address. 1931 */ 1932 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1933 error = EINVAL; 1934 break; 1935 } 1936 mreq = mtod(m, struct ipv6_mreq *); 1937 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1938 if (suser(p, 0)) 1939 { 1940 error = EACCES; 1941 break; 1942 } 1943 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1944 error = EINVAL; 1945 break; 1946 } 1947 /* 1948 * If an interface address was specified, get a pointer 1949 * to its ifnet structure. 1950 */ 1951 if (mreq->ipv6mr_interface < 0 1952 || if_index < mreq->ipv6mr_interface) { 1953 error = ENXIO; /* XXX EINVAL? */ 1954 break; 1955 } 1956 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1957 /* 1958 * Put interface index into the multicast address, 1959 * if the address has link-local scope. 1960 */ 1961 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1962 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1963 htons(mreq->ipv6mr_interface); 1964 } 1965 /* 1966 * Find the membership in the membership list. 1967 */ 1968 for (imm = im6o->im6o_memberships.lh_first; 1969 imm != NULL; imm = imm->i6mm_chain.le_next) { 1970 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 1971 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1972 &mreq->ipv6mr_multiaddr)) 1973 break; 1974 } 1975 if (imm == NULL) { 1976 /* Unable to resolve interface */ 1977 error = EADDRNOTAVAIL; 1978 break; 1979 } 1980 /* 1981 * Give up the multicast address record to which the 1982 * membership points. 1983 */ 1984 LIST_REMOVE(imm, i6mm_chain); 1985 in6_leavegroup(imm); 1986 break; 1987 1988 default: 1989 error = EOPNOTSUPP; 1990 break; 1991 } 1992 1993 /* 1994 * If all options have default values, no need to keep the mbuf. 1995 */ 1996 if (im6o->im6o_multicast_ifp == NULL && 1997 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1998 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1999 im6o->im6o_memberships.lh_first == NULL) { 2000 free(*im6op, M_IPMOPTS); 2001 *im6op = NULL; 2002 } 2003 2004 return (error); 2005 } 2006 2007 /* 2008 * Return the IP6 multicast options in response to user getsockopt(). 2009 */ 2010 static int 2011 ip6_getmoptions(optname, im6o, mp) 2012 int optname; 2013 struct ip6_moptions *im6o; 2014 struct mbuf **mp; 2015 { 2016 u_int *hlim, *loop, *ifindex; 2017 2018 *mp = m_get(M_WAIT, MT_SOOPTS); 2019 2020 switch (optname) { 2021 2022 case IPV6_MULTICAST_IF: 2023 ifindex = mtod(*mp, u_int *); 2024 (*mp)->m_len = sizeof(u_int); 2025 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2026 *ifindex = 0; 2027 else 2028 *ifindex = im6o->im6o_multicast_ifp->if_index; 2029 return (0); 2030 2031 case IPV6_MULTICAST_HOPS: 2032 hlim = mtod(*mp, u_int *); 2033 (*mp)->m_len = sizeof(u_int); 2034 if (im6o == NULL) 2035 *hlim = ip6_defmcasthlim; 2036 else 2037 *hlim = im6o->im6o_multicast_hlim; 2038 return (0); 2039 2040 case IPV6_MULTICAST_LOOP: 2041 loop = mtod(*mp, u_int *); 2042 (*mp)->m_len = sizeof(u_int); 2043 if (im6o == NULL) 2044 *loop = ip6_defmcasthlim; 2045 else 2046 *loop = im6o->im6o_multicast_loop; 2047 return (0); 2048 2049 default: 2050 return (EOPNOTSUPP); 2051 } 2052 } 2053 2054 /* 2055 * Discard the IP6 multicast options. 2056 */ 2057 void 2058 ip6_freemoptions(im6o) 2059 struct ip6_moptions *im6o; 2060 { 2061 struct in6_multi_mship *imm; 2062 2063 if (im6o == NULL) 2064 return; 2065 2066 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2067 LIST_REMOVE(imm, i6mm_chain); 2068 in6_leavegroup(imm); 2069 } 2070 free(im6o, M_IPMOPTS); 2071 } 2072 2073 /* 2074 * Set IPv6 outgoing packet options based on advanced API. 2075 */ 2076 int 2077 ip6_setpktoptions(control, opt, priv) 2078 struct mbuf *control; 2079 struct ip6_pktopts *opt; 2080 int priv; 2081 { 2082 struct cmsghdr *cm = 0; 2083 2084 if (control == 0 || opt == 0) 2085 return (EINVAL); 2086 2087 bzero(opt, sizeof(*opt)); 2088 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2089 2090 /* 2091 * XXX: Currently, we assume all the optional information is stored 2092 * in a single mbuf. 2093 */ 2094 if (control->m_next) 2095 return (EINVAL); 2096 2097 opt->ip6po_m = control; 2098 2099 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2100 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2101 cm = mtod(control, struct cmsghdr *); 2102 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2103 return (EINVAL); 2104 if (cm->cmsg_level != IPPROTO_IPV6) 2105 continue; 2106 2107 switch (cm->cmsg_type) { 2108 case IPV6_PKTINFO: 2109 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2110 return (EINVAL); 2111 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2112 if (opt->ip6po_pktinfo->ipi6_ifindex && 2113 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2114 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2115 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2116 2117 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index || 2118 opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2119 return (ENXIO); 2120 } 2121 2122 /* 2123 * Check if the requested source address is indeed a 2124 * unicast address assigned to the node, and can be 2125 * used as the packet's source address. 2126 */ 2127 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2128 struct ifaddr *ia; 2129 struct in6_ifaddr *ia6; 2130 struct sockaddr_in6 sin6; 2131 2132 bzero(&sin6, sizeof(sin6)); 2133 sin6.sin6_len = sizeof(sin6); 2134 sin6.sin6_family = AF_INET6; 2135 sin6.sin6_addr = 2136 opt->ip6po_pktinfo->ipi6_addr; 2137 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2138 if (ia == NULL || 2139 (opt->ip6po_pktinfo->ipi6_ifindex && 2140 (ia->ifa_ifp->if_index != 2141 opt->ip6po_pktinfo->ipi6_ifindex))) { 2142 return (EADDRNOTAVAIL); 2143 } 2144 ia6 = (struct in6_ifaddr *)ia; 2145 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2146 return (EADDRNOTAVAIL); 2147 } 2148 2149 /* 2150 * Check if the requested source address is 2151 * indeed a unicast address assigned to the 2152 * node. 2153 */ 2154 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2155 return (EADDRNOTAVAIL); 2156 } 2157 break; 2158 2159 case IPV6_HOPLIMIT: 2160 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2161 return (EINVAL); 2162 2163 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2164 sizeof(opt->ip6po_hlim)); 2165 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2166 return (EINVAL); 2167 break; 2168 2169 case IPV6_NEXTHOP: 2170 if (!priv) 2171 return (EPERM); 2172 2173 /* check if cmsg_len is large enough for sa_len */ 2174 if (cm->cmsg_len < sizeof(u_char) || 2175 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2176 return (EINVAL); 2177 2178 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2179 2180 break; 2181 2182 case IPV6_HOPOPTS: 2183 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2184 return (EINVAL); 2185 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2186 if (cm->cmsg_len != 2187 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2188 return (EINVAL); 2189 break; 2190 2191 case IPV6_DSTOPTS: 2192 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2193 return (EINVAL); 2194 2195 /* 2196 * If there is no routing header yet, the destination 2197 * options header should be put on the 1st part. 2198 * Otherwise, the header should be on the 2nd part. 2199 * (See RFC 2460, section 4.1) 2200 */ 2201 if (opt->ip6po_rthdr == NULL) { 2202 opt->ip6po_dest1 = 2203 (struct ip6_dest *)CMSG_DATA(cm); 2204 if (cm->cmsg_len != 2205 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) << 3)); 2206 return (EINVAL); 2207 } 2208 else { 2209 opt->ip6po_dest2 = 2210 (struct ip6_dest *)CMSG_DATA(cm); 2211 if (cm->cmsg_len != 2212 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2213 return (EINVAL); 2214 } 2215 break; 2216 2217 case IPV6_RTHDR: 2218 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2219 return (EINVAL); 2220 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2221 if (cm->cmsg_len != 2222 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2223 return (EINVAL); 2224 switch (opt->ip6po_rthdr->ip6r_type) { 2225 case IPV6_RTHDR_TYPE_0: 2226 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2227 return (EINVAL); 2228 break; 2229 default: 2230 return (EINVAL); 2231 } 2232 break; 2233 2234 default: 2235 return (ENOPROTOOPT); 2236 } 2237 } 2238 2239 return (0); 2240 } 2241 2242 /* 2243 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2244 * packet to the input queue of a specified interface. Note that this 2245 * calls the output routine of the loopback "driver", but with an interface 2246 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 2247 */ 2248 void 2249 ip6_mloopback(ifp, m, dst) 2250 struct ifnet *ifp; 2251 struct mbuf *m; 2252 struct sockaddr_in6 *dst; 2253 { 2254 struct mbuf *copym; 2255 struct ip6_hdr *ip6; 2256 2257 copym = m_copy(m, 0, M_COPYALL); 2258 if (copym == NULL) 2259 return; 2260 2261 /* 2262 * Make sure to deep-copy IPv6 header portion in case the data 2263 * is in an mbuf cluster, so that we can safely override the IPv6 2264 * header portion later. 2265 */ 2266 if ((copym->m_flags & M_EXT) != 0 || 2267 copym->m_len < sizeof(struct ip6_hdr)) { 2268 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2269 if (copym == NULL) 2270 return; 2271 } 2272 2273 #ifdef DIAGNOSTIC 2274 if (copym->m_len < sizeof(*ip6)) { 2275 m_freem(copym); 2276 return; 2277 } 2278 #endif 2279 2280 ip6 = mtod(copym, struct ip6_hdr *); 2281 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2282 ip6->ip6_src.s6_addr16[1] = 0; 2283 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2284 ip6->ip6_dst.s6_addr16[1] = 0; 2285 2286 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2287 } 2288 2289 /* 2290 * Chop IPv6 header off from the payload. 2291 */ 2292 static int 2293 ip6_splithdr(m, exthdrs) 2294 struct mbuf *m; 2295 struct ip6_exthdrs *exthdrs; 2296 { 2297 struct mbuf *mh; 2298 struct ip6_hdr *ip6; 2299 2300 ip6 = mtod(m, struct ip6_hdr *); 2301 if (m->m_len > sizeof(*ip6)) { 2302 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2303 if (mh == 0) { 2304 m_freem(m); 2305 return ENOBUFS; 2306 } 2307 M_MOVE_PKTHDR(mh, m); 2308 MH_ALIGN(mh, sizeof(*ip6)); 2309 m->m_len -= sizeof(*ip6); 2310 m->m_data += sizeof(*ip6); 2311 mh->m_next = m; 2312 m = mh; 2313 m->m_len = sizeof(*ip6); 2314 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2315 } 2316 exthdrs->ip6e_ip6 = m; 2317 return 0; 2318 } 2319 2320 /* 2321 * Compute IPv6 extension header length. 2322 */ 2323 int 2324 ip6_optlen(inp) 2325 struct inpcb *inp; 2326 { 2327 int len; 2328 2329 if (!inp->inp_outputopts6) 2330 return 0; 2331 2332 len = 0; 2333 #define elen(x) \ 2334 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2335 2336 len += elen(inp->inp_outputopts6->ip6po_hbh); 2337 len += elen(inp->inp_outputopts6->ip6po_dest1); 2338 len += elen(inp->inp_outputopts6->ip6po_rthdr); 2339 len += elen(inp->inp_outputopts6->ip6po_dest2); 2340 return len; 2341 #undef elen 2342 } 2343