1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam 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. 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 "opt_ip6fw.h" 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 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/priv.h> 80 81 #include <sys/thread2.h> 82 #include <sys/msgport2.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 #include <net/pfil.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet6/in6_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/ip6protosw.h> 97 98 #ifdef IPSEC 99 #include <netinet6/ipsec.h> 100 #ifdef INET6 101 #include <netinet6/ipsec6.h> 102 #endif 103 #include <netproto/key/key.h> 104 #endif /* IPSEC */ 105 106 #ifdef FAST_IPSEC 107 #include <netproto/ipsec/ipsec.h> 108 #include <netproto/ipsec/ipsec6.h> 109 #include <netproto/ipsec/key.h> 110 #endif 111 112 #include <net/ip6fw/ip6_fw.h> 113 114 #include <net/net_osdep.h> 115 116 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 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_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 127 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 128 int, int, int, int); 129 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 130 struct socket *, struct sockopt *); 131 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 132 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 133 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 134 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 135 struct ifnet *, struct in6_addr *, u_long *, int *); 136 static int copyexthdr (void *, struct mbuf **); 137 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 138 struct ip6_frag **); 139 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 140 static struct mbuf *ip6_splithdr (struct mbuf *); 141 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 142 143 /* 144 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 145 * header (with pri, len, nxt, hlim, src, dst). 146 * This function may modify ver and hlim only. 147 * The mbuf chain containing the packet will be freed. 148 * The mbuf opt, if present, will not be freed. 149 * 150 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 151 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 152 * which is rt_rmx.rmx_mtu. 153 */ 154 int 155 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 156 int flags, struct ip6_moptions *im6o, 157 struct ifnet **ifpp, /* XXX: just for statistics */ 158 struct inpcb *inp) 159 { 160 struct ip6_hdr *ip6, *mhip6; 161 struct ifnet *ifp, *origifp; 162 struct mbuf *m = m0; 163 struct mbuf *mprev; 164 u_char *nexthdrp; 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 int alwaysfrag, dontfrag; 172 u_int32_t optlen, plen = 0, unfragpartlen; 173 struct ip6_exthdrs exthdrs; 174 struct in6_addr finaldst; 175 struct route_in6 *ro_pmtu = NULL; 176 boolean_t hdrsplit = FALSE; 177 boolean_t needipsec = FALSE; 178 #ifdef IPSEC 179 boolean_t needipsectun = FALSE; 180 struct secpolicy *sp = NULL; 181 struct socket *so = inp ? inp->inp_socket : NULL; 182 183 ip6 = mtod(m, struct ip6_hdr *); 184 #endif 185 #ifdef FAST_IPSEC 186 boolean_t needipsectun = FALSE; 187 struct secpolicy *sp = NULL; 188 189 ip6 = mtod(m, struct ip6_hdr *); 190 #endif 191 192 bzero(&exthdrs, sizeof exthdrs); 193 194 if (opt) { 195 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 196 goto freehdrs; 197 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 198 goto freehdrs; 199 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 200 goto freehdrs; 201 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 202 goto freehdrs; 203 } 204 205 #ifdef IPSEC 206 /* get a security policy for this packet */ 207 if (so == NULL) 208 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 209 else 210 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 211 212 if (sp == NULL) { 213 ipsec6stat.out_inval++; 214 goto freehdrs; 215 } 216 217 error = 0; 218 219 /* check policy */ 220 switch (sp->policy) { 221 case IPSEC_POLICY_DISCARD: 222 /* 223 * This packet is just discarded. 224 */ 225 ipsec6stat.out_polvio++; 226 goto freehdrs; 227 228 case IPSEC_POLICY_BYPASS: 229 case IPSEC_POLICY_NONE: 230 /* no need to do IPsec. */ 231 needipsec = FALSE; 232 break; 233 234 case IPSEC_POLICY_IPSEC: 235 if (sp->req == NULL) { 236 error = key_spdacquire(sp); /* acquire a policy */ 237 goto freehdrs; 238 } 239 needipsec = TRUE; 240 break; 241 242 case IPSEC_POLICY_ENTRUST: 243 default: 244 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 245 } 246 #endif /* IPSEC */ 247 #ifdef FAST_IPSEC 248 /* get a security policy for this packet */ 249 if (inp == NULL) 250 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 251 else 252 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 253 254 if (sp == NULL) { 255 newipsecstat.ips_out_inval++; 256 goto freehdrs; 257 } 258 259 error = 0; 260 261 /* check policy */ 262 switch (sp->policy) { 263 case IPSEC_POLICY_DISCARD: 264 /* 265 * This packet is just discarded. 266 */ 267 newipsecstat.ips_out_polvio++; 268 goto freehdrs; 269 270 case IPSEC_POLICY_BYPASS: 271 case IPSEC_POLICY_NONE: 272 /* no need to do IPsec. */ 273 needipsec = FALSE; 274 break; 275 276 case IPSEC_POLICY_IPSEC: 277 if (sp->req == NULL) { 278 error = key_spdacquire(sp); /* acquire a policy */ 279 goto freehdrs; 280 } 281 needipsec = TRUE; 282 break; 283 284 case IPSEC_POLICY_ENTRUST: 285 default: 286 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 287 } 288 #endif /* FAST_IPSEC */ 289 290 /* 291 * Calculate the total length of the extension header chain. 292 * Keep the length of the unfragmentable part for fragmentation. 293 */ 294 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 295 m_lengthm(exthdrs.ip6e_dest1, NULL) + 296 m_lengthm(exthdrs.ip6e_rthdr, NULL); 297 298 unfragpartlen = optlen + sizeof(struct ip6_hdr); 299 300 /* NOTE: we don't add AH/ESP length here. do that later. */ 301 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 302 303 /* 304 * If we need IPsec, or there is at least one extension header, 305 * separate IP6 header from the payload. 306 */ 307 if ((needipsec || optlen) && !hdrsplit) { 308 exthdrs.ip6e_ip6 = ip6_splithdr(m); 309 if (exthdrs.ip6e_ip6 == NULL) { 310 error = ENOBUFS; 311 goto freehdrs; 312 } 313 m = exthdrs.ip6e_ip6; 314 hdrsplit = TRUE; 315 } 316 317 /* adjust pointer */ 318 ip6 = mtod(m, struct ip6_hdr *); 319 320 /* adjust mbuf packet header length */ 321 m->m_pkthdr.len += optlen; 322 plen = m->m_pkthdr.len - sizeof(*ip6); 323 324 /* If this is a jumbo payload, insert a jumbo payload option. */ 325 if (plen > IPV6_MAXPACKET) { 326 if (!hdrsplit) { 327 exthdrs.ip6e_ip6 = ip6_splithdr(m); 328 if (exthdrs.ip6e_ip6 == NULL) { 329 error = ENOBUFS; 330 goto freehdrs; 331 } 332 m = exthdrs.ip6e_ip6; 333 hdrsplit = TRUE; 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 nexthdrp = &ip6->ip6_nxt; 355 mprev = m; 356 357 /* 358 * we treat dest2 specially. this makes IPsec processing 359 * much easier. the goal here is to make mprev point the 360 * mbuf prior to dest2. 361 * 362 * result: IPv6 dest2 payload 363 * m and mprev will point to IPv6 header. 364 */ 365 if (exthdrs.ip6e_dest2) { 366 if (!hdrsplit) 367 panic("assumption failed: hdr not split"); 368 exthdrs.ip6e_dest2->m_next = m->m_next; 369 m->m_next = exthdrs.ip6e_dest2; 370 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 371 ip6->ip6_nxt = IPPROTO_DSTOPTS; 372 } 373 374 /* 375 * Place m1 after mprev. 376 */ 377 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 378 do {\ 379 if (m1) {\ 380 if (!hdrsplit)\ 381 panic("assumption failed: hdr not split");\ 382 *mtod(m1, u_char *) = *nexthdrp;\ 383 *nexthdrp = (i);\ 384 nexthdrp = mtod(m1, u_char *);\ 385 m1->m_next = mprev->m_next;\ 386 mprev->m_next = m1;\ 387 mprev = m1;\ 388 }\ 389 } while (0) 390 391 /* 392 * result: IPv6 hbh dest1 rthdr dest2 payload 393 * m will point to IPv6 header. mprev will point to the 394 * extension header prior to dest2 (rthdr in the above case). 395 */ 396 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 397 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 399 400 #if defined(IPSEC) || defined(FAST_IPSEC) 401 if (needipsec) { 402 struct ipsec_output_state state; 403 int segleft_org = 0; 404 struct ip6_rthdr *rh = NULL; 405 406 /* 407 * pointers after IPsec headers are not valid any more. 408 * other pointers need a great care too. 409 * (IPsec routines should not mangle mbufs prior to AH/ESP) 410 */ 411 exthdrs.ip6e_dest2 = NULL; 412 413 if (exthdrs.ip6e_rthdr) { 414 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 415 segleft_org = rh->ip6r_segleft; 416 rh->ip6r_segleft = 0; 417 } 418 419 bzero(&state, sizeof state); 420 state.m = m; 421 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 422 &needipsectun); 423 m = state.m; 424 if (error) { 425 /* mbuf is already reclaimed in ipsec6_output_trans. */ 426 m = NULL; 427 switch (error) { 428 case EHOSTUNREACH: 429 case ENETUNREACH: 430 case EMSGSIZE: 431 case ENOBUFS: 432 case ENOMEM: 433 break; 434 default: 435 kprintf("ip6_output (ipsec): error code %d\n", 436 error); 437 /* fall through */ 438 case ENOENT: 439 /* don't show these error codes to the user */ 440 error = 0; 441 break; 442 } 443 goto bad; 444 } 445 if (exthdrs.ip6e_rthdr) { 446 /* ah6_output doesn't modify mbuf chain */ 447 rh->ip6r_segleft = segleft_org; 448 } 449 } 450 #endif 451 452 /* 453 * If there is a routing header, replace destination address field 454 * with the first hop of the routing header. 455 */ 456 if (exthdrs.ip6e_rthdr) { 457 struct ip6_rthdr *rh; 458 459 finaldst = ip6->ip6_dst; 460 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 461 switch (rh->ip6r_type) { 462 default: /* is it possible? */ 463 error = EINVAL; 464 goto bad; 465 } 466 } 467 468 /* Source address validation */ 469 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 470 !(flags & IPV6_DADOUTPUT)) { 471 error = EOPNOTSUPP; 472 ip6stat.ip6s_badscope++; 473 goto bad; 474 } 475 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 476 error = EOPNOTSUPP; 477 ip6stat.ip6s_badscope++; 478 goto bad; 479 } 480 481 ip6stat.ip6s_localout++; 482 483 /* 484 * Route packet. 485 */ 486 if (ro == NULL) { 487 ro = &ip6route; 488 bzero(ro, sizeof(*ro)); 489 } 490 ro_pmtu = ro; 491 if (opt && opt->ip6po_rthdr) 492 ro = &opt->ip6po_route; 493 dst = (struct sockaddr_in6 *)&ro->ro_dst; 494 /* 495 * If there is a cached route, 496 * check that it is to the same destination 497 * and is still up. If not, free it and try again. 498 */ 499 if (ro->ro_rt != NULL && 500 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 501 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 502 RTFREE(ro->ro_rt); 503 ro->ro_rt = NULL; 504 } 505 if (ro->ro_rt == NULL) { 506 bzero(dst, sizeof(*dst)); 507 dst->sin6_family = AF_INET6; 508 dst->sin6_len = sizeof(struct sockaddr_in6); 509 dst->sin6_addr = ip6->ip6_dst; 510 } 511 #if defined(IPSEC) || defined(FAST_IPSEC) 512 if (needipsec && needipsectun) { 513 struct ipsec_output_state state; 514 515 /* 516 * All the extension headers will become inaccessible 517 * (since they can be encrypted). 518 * Don't panic, we need no more updates to extension headers 519 * on inner IPv6 packet (since they are now encapsulated). 520 * 521 * IPv6 [ESP|AH] IPv6 [extension headers] payload 522 */ 523 bzero(&exthdrs, sizeof(exthdrs)); 524 exthdrs.ip6e_ip6 = m; 525 526 bzero(&state, sizeof(state)); 527 state.m = m; 528 state.ro = (struct route *)ro; 529 state.dst = (struct sockaddr *)dst; 530 531 error = ipsec6_output_tunnel(&state, sp, flags); 532 533 m = state.m; 534 ro = (struct route_in6 *)state.ro; 535 dst = (struct sockaddr_in6 *)state.dst; 536 if (error) { 537 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 538 m0 = m = NULL; 539 m = NULL; 540 switch (error) { 541 case EHOSTUNREACH: 542 case ENETUNREACH: 543 case EMSGSIZE: 544 case ENOBUFS: 545 case ENOMEM: 546 break; 547 default: 548 kprintf("ip6_output (ipsec): error code %d\n", error); 549 /* fall through */ 550 case ENOENT: 551 /* don't show these error codes to the user */ 552 error = 0; 553 break; 554 } 555 goto bad; 556 } 557 558 exthdrs.ip6e_ip6 = m; 559 } 560 #endif 561 562 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 563 /* Unicast */ 564 565 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 566 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 567 /* xxx 568 * interface selection comes here 569 * if an interface is specified from an upper layer, 570 * ifp must point it. 571 */ 572 if (ro->ro_rt == NULL) { 573 /* 574 * non-bsdi always clone routes, if parent is 575 * PRF_CLONING. 576 */ 577 rtalloc((struct route *)ro); 578 } 579 if (ro->ro_rt == NULL) { 580 ip6stat.ip6s_noroute++; 581 error = EHOSTUNREACH; 582 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 583 goto bad; 584 } 585 ia = ifatoia6(ro->ro_rt->rt_ifa); 586 ifp = ro->ro_rt->rt_ifp; 587 ro->ro_rt->rt_use++; 588 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 589 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 590 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 591 592 in6_ifstat_inc(ifp, ifs6_out_request); 593 594 /* 595 * Check if the outgoing interface conflicts with 596 * the interface specified by ifi6_ifindex (if specified). 597 * Note that loopback interface is always okay. 598 * (this may happen when we are sending a packet to one of 599 * our own addresses.) 600 */ 601 if (opt && opt->ip6po_pktinfo 602 && opt->ip6po_pktinfo->ipi6_ifindex) { 603 if (!(ifp->if_flags & IFF_LOOPBACK) 604 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 605 ip6stat.ip6s_noroute++; 606 in6_ifstat_inc(ifp, ifs6_out_discard); 607 error = EHOSTUNREACH; 608 goto bad; 609 } 610 } 611 612 if (opt && opt->ip6po_hlim != -1) 613 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 614 } else { 615 /* Multicast */ 616 struct in6_multi *in6m; 617 618 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 619 620 /* 621 * See if the caller provided any multicast options 622 */ 623 ifp = NULL; 624 if (im6o != NULL) { 625 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 626 if (im6o->im6o_multicast_ifp != NULL) 627 ifp = im6o->im6o_multicast_ifp; 628 } else 629 ip6->ip6_hlim = ip6_defmcasthlim; 630 631 /* 632 * See if the caller provided the outgoing interface 633 * as an ancillary data. 634 * Boundary check for ifindex is assumed to be already done. 635 */ 636 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 637 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 638 639 /* 640 * If the destination is a node-local scope multicast, 641 * the packet should be loop-backed only. 642 */ 643 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 644 /* 645 * If the outgoing interface is already specified, 646 * it should be a loopback interface. 647 */ 648 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 649 ip6stat.ip6s_badscope++; 650 error = ENETUNREACH; /* XXX: better error? */ 651 /* XXX correct ifp? */ 652 in6_ifstat_inc(ifp, ifs6_out_discard); 653 goto bad; 654 } else { 655 ifp = &loif[0]; 656 } 657 } 658 659 if (opt && opt->ip6po_hlim != -1) 660 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 661 662 /* 663 * If caller did not provide an interface lookup a 664 * default in the routing table. This is either a 665 * default for the speicfied group (i.e. a host 666 * route), or a multicast default (a route for the 667 * ``net'' ff00::/8). 668 */ 669 if (ifp == NULL) { 670 if (ro->ro_rt == NULL) { 671 ro->ro_rt = 672 rtpurelookup((struct sockaddr *)&ro->ro_dst); 673 } 674 if (ro->ro_rt == NULL) { 675 ip6stat.ip6s_noroute++; 676 error = EHOSTUNREACH; 677 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 678 goto bad; 679 } 680 ia = ifatoia6(ro->ro_rt->rt_ifa); 681 ifp = ro->ro_rt->rt_ifp; 682 ro->ro_rt->rt_use++; 683 } 684 685 if (!(flags & IPV6_FORWARDING)) 686 in6_ifstat_inc(ifp, ifs6_out_request); 687 in6_ifstat_inc(ifp, ifs6_out_mcast); 688 689 /* 690 * Confirm that the outgoing interface supports multicast. 691 */ 692 if (!(ifp->if_flags & IFF_MULTICAST)) { 693 ip6stat.ip6s_noroute++; 694 in6_ifstat_inc(ifp, ifs6_out_discard); 695 error = ENETUNREACH; 696 goto bad; 697 } 698 in6m = IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp); 699 if (in6m != NULL && 700 (im6o == NULL || im6o->im6o_multicast_loop)) { 701 /* 702 * If we belong to the destination multicast group 703 * on the outgoing interface, and the caller did not 704 * forbid loopback, loop back a copy. 705 */ 706 ip6_mloopback(ifp, m, dst); 707 } else { 708 /* 709 * If we are acting as a multicast router, perform 710 * multicast forwarding as if the packet had just 711 * arrived on the interface to which we are about 712 * to send. The multicast forwarding function 713 * recursively calls this function, using the 714 * IPV6_FORWARDING flag to prevent infinite recursion. 715 * 716 * Multicasts that are looped back by ip6_mloopback(), 717 * above, will be forwarded by the ip6_input() routine, 718 * if necessary. 719 */ 720 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 721 if (ip6_mforward(ip6, ifp, m) != 0) { 722 m_freem(m); 723 goto done; 724 } 725 } 726 } 727 /* 728 * Multicasts with a hoplimit of zero may be looped back, 729 * above, but must not be transmitted on a network. 730 * Also, multicasts addressed to the loopback interface 731 * are not sent -- the above call to ip6_mloopback() will 732 * loop back a copy if this host actually belongs to the 733 * destination group on the loopback interface. 734 */ 735 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 736 m_freem(m); 737 goto done; 738 } 739 } 740 741 /* 742 * Fill the outgoing inteface to tell the upper layer 743 * to increment per-interface statistics. 744 */ 745 if (ifpp) 746 *ifpp = ifp; 747 748 /* Determine path MTU. */ 749 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 750 &alwaysfrag)) != 0) 751 goto bad; 752 753 /* 754 * The caller of this function may specify to use the minimum MTU 755 * in some cases. 756 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 757 * setting. The logic is a bit complicated; by default, unicast 758 * packets will follow path MTU while multicast packets will be sent at 759 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 760 * including unicast ones will be sent at the minimum MTU. Multicast 761 * packets will always be sent at the minimum MTU unless 762 * IP6PO_MINMTU_DISABLE is explicitly specified. 763 * See RFC 3542 for more details. 764 */ 765 if (mtu > IPV6_MMTU) { 766 if ((flags & IPV6_MINMTU)) 767 mtu = IPV6_MMTU; 768 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 769 mtu = IPV6_MMTU; 770 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 771 (opt == NULL || 772 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 773 mtu = IPV6_MMTU; 774 } 775 } 776 777 /* Fake scoped addresses */ 778 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 779 /* 780 * If source or destination address is a scoped address, and 781 * the packet is going to be sent to a loopback interface, 782 * we should keep the original interface. 783 */ 784 785 /* 786 * XXX: this is a very experimental and temporary solution. 787 * We eventually have sockaddr_in6 and use the sin6_scope_id 788 * field of the structure here. 789 * We rely on the consistency between two scope zone ids 790 * of source and destination, which should already be assured. 791 * Larger scopes than link will be supported in the future. 792 */ 793 origifp = NULL; 794 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 795 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 796 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 797 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 798 /* 799 * XXX: origifp can be NULL even in those two cases above. 800 * For example, if we remove the (only) link-local address 801 * from the loopback interface, and try to send a link-local 802 * address without link-id information. Then the source 803 * address is ::1, and the destination address is the 804 * link-local address with its s6_addr16[1] being zero. 805 * What is worse, if the packet goes to the loopback interface 806 * by a default rejected route, the null pointer would be 807 * passed to looutput, and the kernel would hang. 808 * The following last resort would prevent such disaster. 809 */ 810 if (origifp == NULL) 811 origifp = ifp; 812 } 813 else 814 origifp = ifp; 815 /* 816 * clear embedded scope identifiers if necessary. 817 * in6_clearscope will touch the addresses only when necessary. 818 */ 819 in6_clearscope(&ip6->ip6_src); 820 in6_clearscope(&ip6->ip6_dst); 821 822 /* 823 * Check with the firewall... 824 */ 825 if (ip6_fw_enable && ip6_fw_chk_ptr) { 826 u_short port = 0; 827 828 m->m_pkthdr.rcvif = NULL; /* XXX */ 829 /* If ipfw says divert, we have to just drop packet */ 830 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 831 m_freem(m); 832 goto done; 833 } 834 if (!m) { 835 error = EACCES; 836 goto done; 837 } 838 } 839 840 /* 841 * If the outgoing packet contains a hop-by-hop options header, 842 * it must be examined and processed even by the source node. 843 * (RFC 2460, section 4.) 844 */ 845 if (exthdrs.ip6e_hbh) { 846 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 847 u_int32_t dummy1; /* XXX unused */ 848 u_int32_t dummy2; /* XXX unused */ 849 850 #ifdef DIAGNOSTIC 851 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 852 panic("ip6e_hbh is not continuous"); 853 #endif 854 /* 855 * XXX: if we have to send an ICMPv6 error to the sender, 856 * we need the M_LOOP flag since icmp6_error() expects 857 * the IPv6 and the hop-by-hop options header are 858 * continuous unless the flag is set. 859 */ 860 m->m_flags |= M_LOOP; 861 m->m_pkthdr.rcvif = ifp; 862 if (ip6_process_hopopts(m, 863 (u_int8_t *)(hbh + 1), 864 ((hbh->ip6h_len + 1) << 3) - 865 sizeof(struct ip6_hbh), 866 &dummy1, &dummy2) < 0) { 867 /* m was already freed at this point */ 868 error = EINVAL;/* better error? */ 869 goto done; 870 } 871 m->m_flags &= ~M_LOOP; /* XXX */ 872 m->m_pkthdr.rcvif = NULL; 873 } 874 875 /* 876 * Run through list of hooks for output packets. 877 */ 878 if (pfil_has_hooks(&inet6_pfil_hook)) { 879 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 880 if (error != 0 || m == NULL) 881 goto done; 882 ip6 = mtod(m, struct ip6_hdr *); 883 } 884 885 /* 886 * Send the packet to the outgoing interface. 887 * If necessary, do IPv6 fragmentation before sending. 888 * 889 * the logic here is rather complex: 890 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 891 * 1-a: send as is if tlen <= path mtu 892 * 1-b: fragment if tlen > path mtu 893 * 894 * 2: if user asks us not to fragment (dontfrag == 1) 895 * 2-a: send as is if tlen <= interface mtu 896 * 2-b: error if tlen > interface mtu 897 * 898 * 3: if we always need to attach fragment header (alwaysfrag == 1) 899 * always fragment 900 * 901 * 4: if dontfrag == 1 && alwaysfrag == 1 902 * error, as we cannot handle this conflicting request 903 */ 904 tlen = m->m_pkthdr.len; 905 906 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 907 dontfrag = 1; 908 else 909 dontfrag = 0; 910 if (dontfrag && alwaysfrag) { /* case 4 */ 911 /* conflicting request - can't transmit */ 912 error = EMSGSIZE; 913 goto bad; 914 } 915 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 916 /* 917 * Even if the DONTFRAG option is specified, we cannot send the 918 * packet when the data length is larger than the MTU of the 919 * outgoing interface. 920 * Notify the error by sending IPV6_PATHMTU ancillary data as 921 * well as returning an error code (the latter is not described 922 * in the API spec.) 923 */ 924 u_int32_t mtu32; 925 struct ip6ctlparam ip6cp; 926 927 mtu32 = (u_int32_t)mtu; 928 bzero(&ip6cp, sizeof(ip6cp)); 929 ip6cp.ip6c_cmdarg = (void *)&mtu32; 930 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 931 (void *)&ip6cp); 932 933 error = EMSGSIZE; 934 goto bad; 935 } 936 937 /* 938 * transmit packet without fragmentation 939 */ 940 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 941 struct in6_ifaddr *ia6; 942 943 ip6 = mtod(m, struct ip6_hdr *); 944 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 945 if (ia6) { 946 /* Record statistics for this interface address. */ 947 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1); 948 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len); 949 } 950 #ifdef IPSEC 951 /* clean ipsec history once it goes out of the node */ 952 ipsec_delaux(m); 953 #endif 954 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 955 goto done; 956 } 957 958 /* 959 * try to fragment the packet. case 1-b and 3 960 */ 961 if (mtu < IPV6_MMTU) { 962 /* 963 * note that path MTU is never less than IPV6_MMTU 964 * (see icmp6_input). 965 */ 966 error = EMSGSIZE; 967 in6_ifstat_inc(ifp, ifs6_out_fragfail); 968 goto bad; 969 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 970 error = EMSGSIZE; 971 in6_ifstat_inc(ifp, ifs6_out_fragfail); 972 goto bad; 973 } else { 974 struct mbuf **mnext, *m_frgpart; 975 struct ip6_frag *ip6f; 976 u_int32_t id = htonl(ip6_id++); 977 u_char nextproto; 978 979 /* 980 * Too large for the destination or interface; 981 * fragment if possible. 982 * Must be able to put at least 8 bytes per fragment. 983 */ 984 hlen = unfragpartlen; 985 if (mtu > IPV6_MAXPACKET) 986 mtu = IPV6_MAXPACKET; 987 988 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 989 if (len < 8) { 990 error = EMSGSIZE; 991 in6_ifstat_inc(ifp, ifs6_out_fragfail); 992 goto bad; 993 } 994 995 mnext = &m->m_nextpkt; 996 997 /* 998 * Change the next header field of the last header in the 999 * unfragmentable part. 1000 */ 1001 if (exthdrs.ip6e_rthdr) { 1002 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1003 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1004 } else if (exthdrs.ip6e_dest1) { 1005 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1006 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1007 } else if (exthdrs.ip6e_hbh) { 1008 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1009 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1010 } else { 1011 nextproto = ip6->ip6_nxt; 1012 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1013 } 1014 1015 /* 1016 * Loop through length of segment after first fragment, 1017 * make new header and copy data of each part and link onto 1018 * chain. 1019 */ 1020 m0 = m; 1021 for (off = hlen; off < tlen; off += len) { 1022 MGETHDR(m, M_NOWAIT, MT_HEADER); 1023 if (!m) { 1024 error = ENOBUFS; 1025 ip6stat.ip6s_odropped++; 1026 goto sendorfree; 1027 } 1028 m->m_pkthdr.rcvif = NULL; 1029 m->m_flags = m0->m_flags & M_COPYFLAGS; 1030 *mnext = m; 1031 mnext = &m->m_nextpkt; 1032 m->m_data += max_linkhdr; 1033 mhip6 = mtod(m, struct ip6_hdr *); 1034 *mhip6 = *ip6; 1035 m->m_len = sizeof(*mhip6); 1036 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1037 if (error) { 1038 ip6stat.ip6s_odropped++; 1039 goto sendorfree; 1040 } 1041 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1042 if (off + len >= tlen) 1043 len = tlen - off; 1044 else 1045 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1046 mhip6->ip6_plen = htons((u_short)(len + hlen + 1047 sizeof(*ip6f) - 1048 sizeof(struct ip6_hdr))); 1049 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1050 error = ENOBUFS; 1051 ip6stat.ip6s_odropped++; 1052 goto sendorfree; 1053 } 1054 m_cat(m, m_frgpart); 1055 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1056 m->m_pkthdr.rcvif = NULL; 1057 ip6f->ip6f_reserved = 0; 1058 ip6f->ip6f_ident = id; 1059 ip6f->ip6f_nxt = nextproto; 1060 ip6stat.ip6s_ofragments++; 1061 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1062 } 1063 1064 in6_ifstat_inc(ifp, ifs6_out_fragok); 1065 } 1066 1067 /* 1068 * Remove leading garbages. 1069 */ 1070 sendorfree: 1071 m = m0->m_nextpkt; 1072 m0->m_nextpkt = NULL; 1073 m_freem(m0); 1074 for (m0 = m; m; m = m0) { 1075 m0 = m->m_nextpkt; 1076 m->m_nextpkt = NULL; 1077 if (error == 0) { 1078 /* Record statistics for this interface address. */ 1079 if (ia) { 1080 IFA_STAT_INC(&ia->ia_ifa, opackets, 1); 1081 IFA_STAT_INC(&ia->ia_ifa, obytes, 1082 m->m_pkthdr.len); 1083 } 1084 #ifdef IPSEC 1085 /* clean ipsec history once it goes out of the node */ 1086 ipsec_delaux(m); 1087 #endif 1088 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1089 } else 1090 m_freem(m); 1091 } 1092 1093 if (error == 0) 1094 ip6stat.ip6s_fragmented++; 1095 1096 done: 1097 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1098 RTFREE(ro->ro_rt); 1099 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1100 RTFREE(ro_pmtu->ro_rt); 1101 } 1102 1103 #ifdef IPSEC 1104 if (sp != NULL) 1105 key_freesp(sp); 1106 #endif 1107 #ifdef FAST_IPSEC 1108 if (sp != NULL) 1109 KEY_FREESP(&sp); 1110 #endif 1111 1112 return (error); 1113 1114 freehdrs: 1115 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1116 m_freem(exthdrs.ip6e_dest1); 1117 m_freem(exthdrs.ip6e_rthdr); 1118 m_freem(exthdrs.ip6e_dest2); 1119 /* fall through */ 1120 bad: 1121 m_freem(m); 1122 goto done; 1123 } 1124 1125 static int 1126 copyexthdr(void *h, struct mbuf **mp) 1127 { 1128 struct ip6_ext *hdr = h; 1129 int hlen; 1130 struct mbuf *m; 1131 1132 if (hdr == NULL) 1133 return 0; 1134 1135 hlen = (hdr->ip6e_len + 1) * 8; 1136 if (hlen > MCLBYTES) 1137 return ENOBUFS; /* XXX */ 1138 1139 m = m_getb(hlen, M_NOWAIT, MT_DATA, 0); 1140 if (!m) 1141 return ENOBUFS; 1142 m->m_len = hlen; 1143 1144 bcopy(hdr, mtod(m, caddr_t), hlen); 1145 1146 *mp = m; 1147 return 0; 1148 } 1149 1150 /* 1151 * Insert jumbo payload option. 1152 */ 1153 static int 1154 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1155 { 1156 struct mbuf *mopt; 1157 u_char *optbuf; 1158 u_int32_t v; 1159 1160 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1161 1162 /* 1163 * If there is no hop-by-hop options header, allocate new one. 1164 * If there is one but it doesn't have enough space to store the 1165 * jumbo payload option, allocate a cluster to store the whole options. 1166 * Otherwise, use it to store the options. 1167 */ 1168 if (exthdrs->ip6e_hbh == NULL) { 1169 MGET(mopt, M_NOWAIT, MT_DATA); 1170 if (mopt == NULL) 1171 return (ENOBUFS); 1172 mopt->m_len = JUMBOOPTLEN; 1173 optbuf = mtod(mopt, u_char *); 1174 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1175 exthdrs->ip6e_hbh = mopt; 1176 } else { 1177 struct ip6_hbh *hbh; 1178 1179 mopt = exthdrs->ip6e_hbh; 1180 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1181 /* 1182 * XXX assumption: 1183 * - exthdrs->ip6e_hbh is not referenced from places 1184 * other than exthdrs. 1185 * - exthdrs->ip6e_hbh is not an mbuf chain. 1186 */ 1187 int oldoptlen = mopt->m_len; 1188 struct mbuf *n; 1189 1190 /* 1191 * XXX: give up if the whole (new) hbh header does 1192 * not fit even in an mbuf cluster. 1193 */ 1194 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1195 return (ENOBUFS); 1196 1197 /* 1198 * As a consequence, we must always prepare a cluster 1199 * at this point. 1200 */ 1201 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1202 if (!n) 1203 return (ENOBUFS); 1204 n->m_len = oldoptlen + JUMBOOPTLEN; 1205 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1206 optbuf = mtod(n, caddr_t) + oldoptlen; 1207 m_freem(mopt); 1208 mopt = exthdrs->ip6e_hbh = n; 1209 } else { 1210 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1211 mopt->m_len += JUMBOOPTLEN; 1212 } 1213 optbuf[0] = IP6OPT_PADN; 1214 optbuf[1] = 1; 1215 1216 /* 1217 * Adjust the header length according to the pad and 1218 * the jumbo payload option. 1219 */ 1220 hbh = mtod(mopt, struct ip6_hbh *); 1221 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1222 } 1223 1224 /* fill in the option. */ 1225 optbuf[2] = IP6OPT_JUMBO; 1226 optbuf[3] = 4; 1227 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1228 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1229 1230 /* finally, adjust the packet header length */ 1231 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1232 1233 return (0); 1234 #undef JUMBOOPTLEN 1235 } 1236 1237 /* 1238 * Insert fragment header and copy unfragmentable header portions. 1239 */ 1240 static int 1241 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1242 struct ip6_frag **frghdrp) 1243 { 1244 struct mbuf *n, *mlast; 1245 1246 if (hlen > sizeof(struct ip6_hdr)) { 1247 n = m_copym(m0, sizeof(struct ip6_hdr), 1248 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1249 if (n == NULL) 1250 return (ENOBUFS); 1251 m->m_next = n; 1252 } else 1253 n = m; 1254 1255 /* Search for the last mbuf of unfragmentable part. */ 1256 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1257 ; 1258 1259 if (!(mlast->m_flags & M_EXT) && 1260 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1261 /* use the trailing space of the last mbuf for the fragment hdr */ 1262 *frghdrp = 1263 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1264 mlast->m_len += sizeof(struct ip6_frag); 1265 m->m_pkthdr.len += sizeof(struct ip6_frag); 1266 } else { 1267 /* allocate a new mbuf for the fragment header */ 1268 struct mbuf *mfrg; 1269 1270 MGET(mfrg, M_NOWAIT, MT_DATA); 1271 if (mfrg == NULL) 1272 return (ENOBUFS); 1273 mfrg->m_len = sizeof(struct ip6_frag); 1274 *frghdrp = mtod(mfrg, struct ip6_frag *); 1275 mlast->m_next = mfrg; 1276 } 1277 1278 return (0); 1279 } 1280 1281 static int 1282 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1283 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1284 int *alwaysfragp) 1285 { 1286 u_int32_t mtu = 0; 1287 int alwaysfrag = 0; 1288 int error = 0; 1289 1290 if (ro_pmtu != ro) { 1291 /* The first hop and the final destination may differ. */ 1292 struct sockaddr_in6 *sa6_dst = 1293 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1294 if (ro_pmtu->ro_rt && 1295 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1296 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1297 RTFREE(ro_pmtu->ro_rt); 1298 ro_pmtu->ro_rt = NULL; 1299 } 1300 if (ro_pmtu->ro_rt == NULL) { 1301 bzero(sa6_dst, sizeof(*sa6_dst)); 1302 sa6_dst->sin6_family = AF_INET6; 1303 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1304 sa6_dst->sin6_addr = *dst; 1305 1306 rtalloc((struct route *)ro_pmtu); 1307 } 1308 } 1309 if (ro_pmtu->ro_rt) { 1310 u_int32_t ifmtu; 1311 struct in_conninfo inc; 1312 1313 bzero(&inc, sizeof(inc)); 1314 inc.inc_flags = 1; /* IPv6 */ 1315 inc.inc6_faddr = *dst; 1316 1317 if (ifp == NULL) 1318 ifp = ro_pmtu->ro_rt->rt_ifp; 1319 ifmtu = IN6_LINKMTU(ifp); 1320 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1321 if (mtu == 0) 1322 mtu = ifmtu; 1323 else if (mtu < IPV6_MMTU) { 1324 /* 1325 * RFC2460 section 5, last paragraph: 1326 * if we record ICMPv6 too big message with 1327 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1328 * or smaller, with framgent header attached. 1329 * (fragment header is needed regardless from the 1330 * packet size, for translators to identify packets) 1331 */ 1332 alwaysfrag = 1; 1333 mtu = IPV6_MMTU; 1334 } else if (mtu > ifmtu) { 1335 /* 1336 * The MTU on the route is larger than the MTU on 1337 * the interface! This shouldn't happen, unless the 1338 * MTU of the interface has been changed after the 1339 * interface was brought up. Change the MTU in the 1340 * route to match the interface MTU (as long as the 1341 * field isn't locked). 1342 */ 1343 mtu = ifmtu; 1344 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1345 } 1346 } else if (ifp) { 1347 mtu = IN6_LINKMTU(ifp); 1348 } else 1349 error = EHOSTUNREACH; /* XXX */ 1350 1351 *mtup = mtu; 1352 if (alwaysfragp) 1353 *alwaysfragp = alwaysfrag; 1354 return (error); 1355 } 1356 1357 /* 1358 * IP6 socket option processing. 1359 */ 1360 void 1361 ip6_ctloutput_dispatch(netmsg_t msg) 1362 { 1363 int error; 1364 1365 error = ip6_ctloutput(msg->ctloutput.base.nm_so, 1366 msg->ctloutput.nm_sopt); 1367 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 1368 } 1369 1370 int 1371 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1372 { 1373 int optdatalen,uproto; 1374 int privileged; 1375 struct inpcb *in6p = so->so_pcb; 1376 void *optdata; 1377 int error, optval; 1378 int level, op, optname; 1379 int optlen; 1380 struct thread *td; 1381 1382 if (sopt) { 1383 level = sopt->sopt_level; 1384 op = sopt->sopt_dir; 1385 optname = sopt->sopt_name; 1386 optlen = sopt->sopt_valsize; 1387 td = sopt->sopt_td; 1388 } else { 1389 panic("ip6_ctloutput: arg soopt is NULL"); 1390 /* NOT REACHED */ 1391 td = NULL; 1392 } 1393 error = optval = 0; 1394 1395 uproto = (int)so->so_proto->pr_protocol; 1396 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1; 1397 1398 if (level == IPPROTO_IPV6) { 1399 switch (op) { 1400 1401 case SOPT_SET: 1402 switch (optname) { 1403 case IPV6_2292PKTOPTIONS: 1404 #ifdef IPV6_PKTOPTIONS 1405 case IPV6_PKTOPTIONS: 1406 #endif 1407 { 1408 struct mbuf *m; 1409 1410 error = soopt_getm(sopt, &m); /* XXX */ 1411 if (error != 0) 1412 break; 1413 soopt_to_mbuf(sopt, m); /* XXX */ 1414 error = ip6_pcbopts(&in6p->in6p_outputopts, 1415 m, so, sopt); 1416 m_freem(m); /* XXX */ 1417 break; 1418 } 1419 1420 /* 1421 * Use of some Hop-by-Hop options or some 1422 * Destination options, might require special 1423 * privilege. That is, normal applications 1424 * (without special privilege) might be forbidden 1425 * from setting certain options in outgoing packets, 1426 * and might never see certain options in received 1427 * packets. [RFC 2292 Section 6] 1428 * KAME specific note: 1429 * KAME prevents non-privileged users from sending or 1430 * receiving ANY hbh/dst options in order to avoid 1431 * overhead of parsing options in the kernel. 1432 */ 1433 case IPV6_RECVHOPOPTS: 1434 case IPV6_RECVDSTOPTS: 1435 case IPV6_RECVRTHDRDSTOPTS: 1436 if (!privileged) 1437 return (EPERM); 1438 case IPV6_RECVPKTINFO: 1439 case IPV6_RECVHOPLIMIT: 1440 case IPV6_RECVRTHDR: 1441 case IPV6_RECVPATHMTU: 1442 case IPV6_RECVTCLASS: 1443 case IPV6_AUTOFLOWLABEL: 1444 case IPV6_HOPLIMIT: 1445 /* FALLTHROUGH */ 1446 case IPV6_UNICAST_HOPS: 1447 case IPV6_FAITH: 1448 1449 case IPV6_V6ONLY: 1450 if (optlen != sizeof(int)) { 1451 error = EINVAL; 1452 break; 1453 } 1454 error = soopt_to_kbuf(sopt, &optval, 1455 sizeof optval, sizeof optval); 1456 if (error) 1457 break; 1458 switch (optname) { 1459 1460 case IPV6_UNICAST_HOPS: 1461 if (optval < -1 || optval >= 256) 1462 error = EINVAL; 1463 else { 1464 /* -1 = kernel default */ 1465 in6p->in6p_hops = optval; 1466 } 1467 break; 1468 #define OPTSET(bit) \ 1469 do { \ 1470 if (optval) \ 1471 in6p->in6p_flags |= (bit); \ 1472 else \ 1473 in6p->in6p_flags &= ~(bit); \ 1474 } while (0) 1475 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1476 /* 1477 * Although changed to RFC3542, It's better to also support RFC2292 API 1478 */ 1479 #define OPTSET2292(bit) \ 1480 do { \ 1481 in6p->in6p_flags |= IN6P_RFC2292; \ 1482 if (optval) \ 1483 in6p->in6p_flags |= (bit); \ 1484 else \ 1485 in6p->in6p_flags &= ~(bit); \ 1486 } while (/*CONSTCOND*/ 0) 1487 1488 case IPV6_RECVPKTINFO: 1489 /* cannot mix with RFC2292 */ 1490 if (OPTBIT(IN6P_RFC2292)) { 1491 error = EINVAL; 1492 break; 1493 } 1494 OPTSET(IN6P_PKTINFO); 1495 break; 1496 1497 case IPV6_HOPLIMIT: 1498 { 1499 struct ip6_pktopts **optp; 1500 1501 /* cannot mix with RFC2292 */ 1502 if (OPTBIT(IN6P_RFC2292)) { 1503 error = EINVAL; 1504 break; 1505 } 1506 optp = &in6p->in6p_outputopts; 1507 error = ip6_pcbopt(IPV6_HOPLIMIT, 1508 (u_char *)&optval, sizeof(optval), 1509 optp, uproto); 1510 break; 1511 } 1512 1513 case IPV6_RECVHOPLIMIT: 1514 /* cannot mix with RFC2292 */ 1515 if (OPTBIT(IN6P_RFC2292)) { 1516 error = EINVAL; 1517 break; 1518 } 1519 OPTSET(IN6P_HOPLIMIT); 1520 break; 1521 1522 case IPV6_RECVHOPOPTS: 1523 /* cannot mix with RFC2292 */ 1524 if (OPTBIT(IN6P_RFC2292)) { 1525 error = EINVAL; 1526 break; 1527 } 1528 OPTSET(IN6P_HOPOPTS); 1529 break; 1530 1531 case IPV6_RECVDSTOPTS: 1532 /* cannot mix with RFC2292 */ 1533 if (OPTBIT(IN6P_RFC2292)) { 1534 error = EINVAL; 1535 break; 1536 } 1537 OPTSET(IN6P_DSTOPTS); 1538 break; 1539 1540 case IPV6_RECVRTHDRDSTOPTS: 1541 /* cannot mix with RFC2292 */ 1542 if (OPTBIT(IN6P_RFC2292)) { 1543 error = EINVAL; 1544 break; 1545 } 1546 OPTSET(IN6P_RTHDRDSTOPTS); 1547 break; 1548 1549 case IPV6_RECVRTHDR: 1550 /* cannot mix with RFC2292 */ 1551 if (OPTBIT(IN6P_RFC2292)) { 1552 error = EINVAL; 1553 break; 1554 } 1555 OPTSET(IN6P_RTHDR); 1556 break; 1557 1558 case IPV6_RECVPATHMTU: 1559 /* 1560 * We ignore this option for TCP 1561 * sockets. 1562 * (RFC3542 leaves this case 1563 * unspecified.) 1564 */ 1565 if (uproto != IPPROTO_TCP) 1566 OPTSET(IN6P_MTU); 1567 break; 1568 1569 case IPV6_RECVTCLASS: 1570 /* cannot mix with RFC2292 XXX */ 1571 if (OPTBIT(IN6P_RFC2292)) { 1572 error = EINVAL; 1573 break; 1574 } 1575 OPTSET(IN6P_TCLASS); 1576 break; 1577 1578 case IPV6_AUTOFLOWLABEL: 1579 OPTSET(IN6P_AUTOFLOWLABEL); 1580 break; 1581 1582 case IPV6_FAITH: 1583 OPTSET(IN6P_FAITH); 1584 break; 1585 1586 case IPV6_V6ONLY: 1587 /* 1588 * make setsockopt(IPV6_V6ONLY) 1589 * available only prior to bind(2). 1590 */ 1591 if (in6p->in6p_lport || 1592 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1593 { 1594 error = EINVAL; 1595 break; 1596 } 1597 if (!optval) { 1598 /* Don't allow v4-mapped */ 1599 error = EOPNOTSUPP; 1600 } 1601 break; 1602 } 1603 break; 1604 1605 case IPV6_TCLASS: 1606 case IPV6_DONTFRAG: 1607 case IPV6_USE_MIN_MTU: 1608 case IPV6_PREFER_TEMPADDR: 1609 if (optlen != sizeof(optval)) { 1610 error = EINVAL; 1611 break; 1612 } 1613 error = soopt_to_kbuf(sopt, &optval, 1614 sizeof optval, sizeof optval); 1615 if (error) 1616 break; 1617 { 1618 struct ip6_pktopts **optp; 1619 optp = &in6p->in6p_outputopts; 1620 error = ip6_pcbopt(optname, 1621 (u_char *)&optval, sizeof(optval), 1622 optp, uproto); 1623 break; 1624 } 1625 1626 case IPV6_2292PKTINFO: 1627 case IPV6_2292HOPLIMIT: 1628 case IPV6_2292HOPOPTS: 1629 case IPV6_2292DSTOPTS: 1630 case IPV6_2292RTHDR: 1631 /* RFC 2292 */ 1632 if (optlen != sizeof(int)) { 1633 error = EINVAL; 1634 break; 1635 } 1636 error = soopt_to_kbuf(sopt, &optval, 1637 sizeof optval, sizeof optval); 1638 if (error) 1639 break; 1640 switch (optname) { 1641 case IPV6_2292PKTINFO: 1642 OPTSET2292(IN6P_PKTINFO); 1643 break; 1644 case IPV6_2292HOPLIMIT: 1645 OPTSET2292(IN6P_HOPLIMIT); 1646 break; 1647 case IPV6_2292HOPOPTS: 1648 /* 1649 * Check super-user privilege. 1650 * See comments for IPV6_RECVHOPOPTS. 1651 */ 1652 if (!privileged) 1653 return (EPERM); 1654 OPTSET2292(IN6P_HOPOPTS); 1655 break; 1656 case IPV6_2292DSTOPTS: 1657 if (!privileged) 1658 return (EPERM); 1659 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1660 break; 1661 case IPV6_2292RTHDR: 1662 OPTSET2292(IN6P_RTHDR); 1663 break; 1664 } 1665 break; 1666 1667 case IPV6_PKTINFO: 1668 case IPV6_HOPOPTS: 1669 case IPV6_RTHDR: 1670 case IPV6_DSTOPTS: 1671 case IPV6_RTHDRDSTOPTS: 1672 case IPV6_NEXTHOP: 1673 { 1674 /* 1675 * New advanced API (RFC3542) 1676 */ 1677 u_char *optbuf; 1678 u_char optbuf_storage[MCLBYTES]; 1679 int optlen; 1680 struct ip6_pktopts **optp; 1681 1682 /* cannot mix with RFC2292 */ 1683 if (OPTBIT(IN6P_RFC2292)) { 1684 error = EINVAL; 1685 break; 1686 } 1687 1688 /* 1689 * We only ensure valsize is not too large 1690 * here. Further validation will be done 1691 * later. 1692 */ 1693 error = soopt_to_kbuf(sopt, optbuf_storage, 1694 sizeof(optbuf_storage), 0); 1695 if (error) 1696 break; 1697 optlen = sopt->sopt_valsize; 1698 optbuf = optbuf_storage; 1699 optp = &in6p->in6p_outputopts; 1700 error = ip6_pcbopt(optname, optbuf, optlen, 1701 optp, uproto); 1702 break; 1703 } 1704 #undef OPTSET 1705 1706 case IPV6_MULTICAST_IF: 1707 case IPV6_MULTICAST_HOPS: 1708 case IPV6_MULTICAST_LOOP: 1709 case IPV6_JOIN_GROUP: 1710 case IPV6_LEAVE_GROUP: 1711 { 1712 struct mbuf *m; 1713 if (sopt->sopt_valsize > MLEN) { 1714 error = EMSGSIZE; 1715 break; 1716 } 1717 /* XXX */ 1718 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_HEADER); 1719 if (m == NULL) { 1720 error = ENOBUFS; 1721 break; 1722 } 1723 m->m_len = sopt->sopt_valsize; 1724 error = soopt_to_kbuf(sopt, mtod(m, char *), 1725 m->m_len, m->m_len); 1726 error = ip6_setmoptions(sopt->sopt_name, 1727 &in6p->in6p_moptions, 1728 m); 1729 m_free(m); 1730 } 1731 break; 1732 1733 case IPV6_PORTRANGE: 1734 error = soopt_to_kbuf(sopt, &optval, 1735 sizeof optval, sizeof optval); 1736 if (error) 1737 break; 1738 1739 switch (optval) { 1740 case IPV6_PORTRANGE_DEFAULT: 1741 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1742 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1743 break; 1744 1745 case IPV6_PORTRANGE_HIGH: 1746 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1747 in6p->in6p_flags |= IN6P_HIGHPORT; 1748 break; 1749 1750 case IPV6_PORTRANGE_LOW: 1751 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1752 in6p->in6p_flags |= IN6P_LOWPORT; 1753 break; 1754 1755 default: 1756 error = EINVAL; 1757 break; 1758 } 1759 break; 1760 1761 #if defined(IPSEC) || defined(FAST_IPSEC) 1762 case IPV6_IPSEC_POLICY: 1763 { 1764 caddr_t req = NULL; 1765 size_t len = 0; 1766 struct mbuf *m; 1767 1768 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1769 break; 1770 soopt_to_mbuf(sopt, m); /* XXX */ 1771 if (m) { 1772 req = mtod(m, caddr_t); 1773 len = m->m_len; 1774 } 1775 error = ipsec6_set_policy(in6p, optname, req, 1776 len, privileged); 1777 m_freem(m); 1778 } 1779 break; 1780 #endif /* KAME IPSEC */ 1781 1782 case IPV6_FW_ADD: 1783 case IPV6_FW_DEL: 1784 case IPV6_FW_FLUSH: 1785 case IPV6_FW_ZERO: 1786 { 1787 struct mbuf *m; 1788 struct mbuf **mp = &m; 1789 1790 if (ip6_fw_ctl_ptr == NULL) 1791 return EINVAL; 1792 /* XXX */ 1793 if ((error = soopt_getm(sopt, &m)) != 0) 1794 break; 1795 /* XXX */ 1796 soopt_to_mbuf(sopt, m); 1797 error = (*ip6_fw_ctl_ptr)(optname, mp); 1798 m = *mp; 1799 } 1800 break; 1801 1802 default: 1803 error = ENOPROTOOPT; 1804 break; 1805 } 1806 break; 1807 1808 case SOPT_GET: 1809 switch (optname) { 1810 case IPV6_2292PKTOPTIONS: 1811 #ifdef IPV6_PKTOPTIONS 1812 case IPV6_PKTOPTIONS: 1813 #endif 1814 /* 1815 * RFC3542 (effectively) deprecated the 1816 * semantics of the 2292-style pktoptions. 1817 * Since it was not reliable in nature (i.e., 1818 * applications had to expect the lack of some 1819 * information after all), it would make sense 1820 * to simplify this part by always returning 1821 * empty data. 1822 */ 1823 if (in6p->in6p_options) { 1824 struct mbuf *m; 1825 m = m_copym(in6p->in6p_options, 1826 0, M_COPYALL, M_WAITOK); 1827 error = soopt_from_mbuf(sopt, m); 1828 if (error == 0) 1829 m_freem(m); 1830 } else 1831 sopt->sopt_valsize = 0; 1832 break; 1833 1834 case IPV6_RECVHOPOPTS: 1835 case IPV6_RECVDSTOPTS: 1836 case IPV6_RECVRTHDRDSTOPTS: 1837 case IPV6_UNICAST_HOPS: 1838 case IPV6_RECVPKTINFO: 1839 case IPV6_RECVHOPLIMIT: 1840 case IPV6_RECVRTHDR: 1841 case IPV6_RECVPATHMTU: 1842 case IPV6_RECVTCLASS: 1843 case IPV6_AUTOFLOWLABEL: 1844 case IPV6_FAITH: 1845 case IPV6_V6ONLY: 1846 case IPV6_PORTRANGE: 1847 switch (optname) { 1848 1849 case IPV6_RECVHOPOPTS: 1850 optval = OPTBIT(IN6P_HOPOPTS); 1851 break; 1852 1853 case IPV6_RECVDSTOPTS: 1854 optval = OPTBIT(IN6P_DSTOPTS); 1855 break; 1856 1857 case IPV6_RECVRTHDRDSTOPTS: 1858 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1859 break; 1860 1861 case IPV6_RECVPKTINFO: 1862 optval = OPTBIT(IN6P_PKTINFO); 1863 break; 1864 1865 case IPV6_RECVHOPLIMIT: 1866 optval = OPTBIT(IN6P_HOPLIMIT); 1867 break; 1868 1869 case IPV6_RECVRTHDR: 1870 optval = OPTBIT(IN6P_RTHDR); 1871 break; 1872 1873 case IPV6_RECVPATHMTU: 1874 optval = OPTBIT(IN6P_MTU); 1875 break; 1876 1877 case IPV6_RECVTCLASS: 1878 optval = OPTBIT(IN6P_TCLASS); 1879 break; 1880 1881 case IPV6_AUTOFLOWLABEL: 1882 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1883 break; 1884 1885 1886 case IPV6_UNICAST_HOPS: 1887 optval = in6p->in6p_hops; 1888 break; 1889 1890 case IPV6_FAITH: 1891 optval = OPTBIT(IN6P_FAITH); 1892 break; 1893 1894 case IPV6_V6ONLY: 1895 optval = 1; 1896 break; 1897 1898 case IPV6_PORTRANGE: 1899 { 1900 int flags; 1901 flags = in6p->in6p_flags; 1902 if (flags & IN6P_HIGHPORT) 1903 optval = IPV6_PORTRANGE_HIGH; 1904 else if (flags & IN6P_LOWPORT) 1905 optval = IPV6_PORTRANGE_LOW; 1906 else 1907 optval = 0; 1908 break; 1909 } 1910 } 1911 soopt_from_kbuf(sopt, &optval, 1912 sizeof optval); 1913 break; 1914 1915 case IPV6_PATHMTU: 1916 { 1917 u_long pmtu = 0; 1918 struct ip6_mtuinfo mtuinfo; 1919 struct route_in6 sro; 1920 1921 bzero(&sro, sizeof(sro)); 1922 1923 if (!(so->so_state & SS_ISCONNECTED)) 1924 return (ENOTCONN); 1925 /* 1926 * XXX: we dot not consider the case of source 1927 * routing, or optional information to specify 1928 * the outgoing interface. 1929 */ 1930 error = ip6_getpmtu(&sro, NULL, NULL, 1931 &in6p->in6p_faddr, &pmtu, NULL); 1932 if (sro.ro_rt) 1933 RTFREE(sro.ro_rt); 1934 if (error) 1935 break; 1936 if (pmtu > IPV6_MAXPACKET) 1937 pmtu = IPV6_MAXPACKET; 1938 1939 bzero(&mtuinfo, sizeof(mtuinfo)); 1940 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1941 optdata = (void *)&mtuinfo; 1942 optdatalen = sizeof(mtuinfo); 1943 soopt_from_kbuf(sopt, optdata, 1944 optdatalen); 1945 break; 1946 } 1947 1948 case IPV6_2292PKTINFO: 1949 case IPV6_2292HOPLIMIT: 1950 case IPV6_2292HOPOPTS: 1951 case IPV6_2292RTHDR: 1952 case IPV6_2292DSTOPTS: 1953 if (optname == IPV6_2292HOPOPTS || 1954 optname == IPV6_2292DSTOPTS || 1955 !privileged) 1956 return (EPERM); 1957 switch (optname) { 1958 case IPV6_2292PKTINFO: 1959 optval = OPTBIT(IN6P_PKTINFO); 1960 break; 1961 case IPV6_2292HOPLIMIT: 1962 optval = OPTBIT(IN6P_HOPLIMIT); 1963 break; 1964 case IPV6_2292HOPOPTS: 1965 if (!privileged) 1966 return (EPERM); 1967 optval = OPTBIT(IN6P_HOPOPTS); 1968 break; 1969 case IPV6_2292RTHDR: 1970 optval = OPTBIT(IN6P_RTHDR); 1971 break; 1972 case IPV6_2292DSTOPTS: 1973 if (!privileged) 1974 return (EPERM); 1975 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1976 break; 1977 } 1978 soopt_from_kbuf(sopt, &optval, 1979 sizeof optval); 1980 break; 1981 1982 case IPV6_PKTINFO: 1983 case IPV6_HOPOPTS: 1984 case IPV6_RTHDR: 1985 case IPV6_DSTOPTS: 1986 case IPV6_RTHDRDSTOPTS: 1987 case IPV6_NEXTHOP: 1988 case IPV6_TCLASS: 1989 case IPV6_DONTFRAG: 1990 case IPV6_USE_MIN_MTU: 1991 case IPV6_PREFER_TEMPADDR: 1992 error = ip6_getpcbopt(in6p->in6p_outputopts, 1993 optname, sopt); 1994 break; 1995 1996 case IPV6_MULTICAST_IF: 1997 case IPV6_MULTICAST_HOPS: 1998 case IPV6_MULTICAST_LOOP: 1999 case IPV6_JOIN_GROUP: 2000 case IPV6_LEAVE_GROUP: 2001 { 2002 struct mbuf *m; 2003 error = ip6_getmoptions(sopt->sopt_name, 2004 in6p->in6p_moptions, &m); 2005 if (error == 0) 2006 soopt_from_kbuf(sopt, 2007 mtod(m, char *), m->m_len); 2008 m_freem(m); 2009 } 2010 break; 2011 2012 #if defined(IPSEC) || defined(FAST_IPSEC) 2013 case IPV6_IPSEC_POLICY: 2014 { 2015 caddr_t req = NULL; 2016 size_t len = 0; 2017 struct mbuf *m = NULL; 2018 struct mbuf **mp = &m; 2019 2020 error = soopt_getm(sopt, &m); /* XXX */ 2021 if (error != 0) 2022 break; 2023 soopt_to_mbuf(sopt, m); /* XXX */ 2024 if (m) { 2025 req = mtod(m, caddr_t); 2026 len = m->m_len; 2027 } 2028 error = ipsec6_get_policy(in6p, req, len, mp); 2029 if (error == 0) 2030 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2031 if (error == 0 && m != NULL) 2032 m_freem(m); 2033 break; 2034 } 2035 #endif /* KAME IPSEC */ 2036 2037 case IPV6_FW_GET: 2038 { 2039 struct mbuf *m; 2040 struct mbuf **mp = &m; 2041 2042 if (ip6_fw_ctl_ptr == NULL) 2043 { 2044 return EINVAL; 2045 } 2046 error = (*ip6_fw_ctl_ptr)(optname, mp); 2047 if (error == 0) 2048 error = soopt_from_mbuf(sopt, m); /* XXX */ 2049 if (error == 0 && m != NULL) 2050 m_freem(m); 2051 } 2052 break; 2053 2054 default: 2055 error = ENOPROTOOPT; 2056 break; 2057 } 2058 break; 2059 } 2060 } else { 2061 error = EINVAL; 2062 } 2063 return (error); 2064 } 2065 2066 int 2067 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2068 { 2069 int error = 0, optval, optlen; 2070 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2071 struct in6pcb *in6p = sotoin6pcb(so); 2072 int level, op, optname; 2073 2074 if (sopt) { 2075 level = sopt->sopt_level; 2076 op = sopt->sopt_dir; 2077 optname = sopt->sopt_name; 2078 optlen = sopt->sopt_valsize; 2079 } else 2080 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2081 2082 if (level != IPPROTO_IPV6) { 2083 return (EINVAL); 2084 } 2085 2086 switch (optname) { 2087 case IPV6_CHECKSUM: 2088 /* 2089 * For ICMPv6 sockets, no modification allowed for checksum 2090 * offset, permit "no change" values to help existing apps. 2091 * 2092 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2093 * for an ICMPv6 socket will fail." 2094 * The current behavior does not meet RFC3542. 2095 */ 2096 switch (op) { 2097 case SOPT_SET: 2098 if (optlen != sizeof(int)) { 2099 error = EINVAL; 2100 break; 2101 } 2102 error = soopt_to_kbuf(sopt, &optval, 2103 sizeof optval, sizeof optval); 2104 if (error) 2105 break; 2106 if ((optval % 2) != 0) { 2107 /* the API assumes even offset values */ 2108 error = EINVAL; 2109 } else if (so->so_proto->pr_protocol == 2110 IPPROTO_ICMPV6) { 2111 if (optval != icmp6off) 2112 error = EINVAL; 2113 } else 2114 in6p->in6p_cksum = optval; 2115 break; 2116 2117 case SOPT_GET: 2118 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2119 optval = icmp6off; 2120 else 2121 optval = in6p->in6p_cksum; 2122 2123 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2124 break; 2125 2126 default: 2127 error = EINVAL; 2128 break; 2129 } 2130 break; 2131 2132 default: 2133 error = ENOPROTOOPT; 2134 break; 2135 } 2136 2137 return (error); 2138 } 2139 2140 /* 2141 * Set up IP6 options in pcb for insertion in output packets or 2142 * specifying behavior of outgoing packets. 2143 */ 2144 static int 2145 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2146 struct socket *so, struct sockopt *sopt) 2147 { 2148 int priv = 0; 2149 struct ip6_pktopts *opt = *pktopt; 2150 int error = 0; 2151 2152 /* turn off any old options. */ 2153 if (opt) { 2154 #ifdef DIAGNOSTIC 2155 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2156 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2157 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2158 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2159 #endif 2160 ip6_clearpktopts(opt, -1); 2161 } else 2162 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2163 *pktopt = NULL; 2164 2165 if (!m || m->m_len == 0) { 2166 /* 2167 * Only turning off any previous options, regardless of 2168 * whether the opt is just created or given. 2169 */ 2170 kfree(opt, M_IP6OPT); 2171 return (0); 2172 } 2173 2174 /* set options specified by user. */ 2175 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2176 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2177 kfree(opt, M_IP6OPT); 2178 return (error); 2179 } 2180 *pktopt = opt; 2181 return (0); 2182 } 2183 2184 2185 /* 2186 * Below three functions are introduced by merge to RFC3542 2187 */ 2188 2189 static int 2190 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2191 { 2192 void *optdata = NULL; 2193 int optdatalen = 0; 2194 struct ip6_ext *ip6e; 2195 int error = 0; 2196 struct in6_pktinfo null_pktinfo; 2197 int deftclass = 0, on; 2198 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2199 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2200 2201 switch (optname) { 2202 case IPV6_PKTINFO: 2203 if (pktopt && pktopt->ip6po_pktinfo) 2204 optdata = (void *)pktopt->ip6po_pktinfo; 2205 else { 2206 /* XXX: we don't have to do this every time... */ 2207 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2208 optdata = (void *)&null_pktinfo; 2209 } 2210 optdatalen = sizeof(struct in6_pktinfo); 2211 break; 2212 case IPV6_TCLASS: 2213 if (pktopt && pktopt->ip6po_tclass >= 0) 2214 optdata = (void *)&pktopt->ip6po_tclass; 2215 else 2216 optdata = (void *)&deftclass; 2217 optdatalen = sizeof(int); 2218 break; 2219 case IPV6_HOPOPTS: 2220 if (pktopt && pktopt->ip6po_hbh) { 2221 optdata = (void *)pktopt->ip6po_hbh; 2222 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2223 optdatalen = (ip6e->ip6e_len + 1) << 3; 2224 } 2225 break; 2226 case IPV6_RTHDR: 2227 if (pktopt && pktopt->ip6po_rthdr) { 2228 optdata = (void *)pktopt->ip6po_rthdr; 2229 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2230 optdatalen = (ip6e->ip6e_len + 1) << 3; 2231 } 2232 break; 2233 case IPV6_RTHDRDSTOPTS: 2234 if (pktopt && pktopt->ip6po_dest1) { 2235 optdata = (void *)pktopt->ip6po_dest1; 2236 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2237 optdatalen = (ip6e->ip6e_len + 1) << 3; 2238 } 2239 break; 2240 case IPV6_DSTOPTS: 2241 if (pktopt && pktopt->ip6po_dest2) { 2242 optdata = (void *)pktopt->ip6po_dest2; 2243 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2244 optdatalen = (ip6e->ip6e_len + 1) << 3; 2245 } 2246 break; 2247 case IPV6_NEXTHOP: 2248 if (pktopt && pktopt->ip6po_nexthop) { 2249 optdata = (void *)pktopt->ip6po_nexthop; 2250 optdatalen = pktopt->ip6po_nexthop->sa_len; 2251 } 2252 break; 2253 case IPV6_USE_MIN_MTU: 2254 if (pktopt) 2255 optdata = (void *)&pktopt->ip6po_minmtu; 2256 else 2257 optdata = (void *)&defminmtu; 2258 optdatalen = sizeof(int); 2259 break; 2260 case IPV6_DONTFRAG: 2261 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2262 on = 1; 2263 else 2264 on = 0; 2265 optdata = (void *)&on; 2266 optdatalen = sizeof(on); 2267 break; 2268 case IPV6_PREFER_TEMPADDR: 2269 if (pktopt) 2270 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2271 else 2272 optdata = (void *)&defpreftemp; 2273 optdatalen = sizeof(int); 2274 break; 2275 default: /* should not happen */ 2276 #ifdef DIAGNOSTIC 2277 panic("ip6_getpcbopt: unexpected option"); 2278 #endif 2279 return (ENOPROTOOPT); 2280 } 2281 2282 soopt_from_kbuf(sopt, optdata, optdatalen); 2283 2284 return (error); 2285 } 2286 2287 /* 2288 * initialize ip6_pktopts. beware that there are non-zero default values in 2289 * the struct. 2290 */ 2291 2292 static int 2293 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2294 { 2295 struct ip6_pktopts *opt; 2296 int priv =0; 2297 if (*pktopt == NULL) { 2298 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2299 init_ip6pktopts(*pktopt); 2300 } 2301 opt = *pktopt; 2302 2303 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2304 } 2305 2306 /* 2307 * initialize ip6_pktopts. beware that there are non-zero default values in 2308 * the struct. 2309 */ 2310 void 2311 init_ip6pktopts(struct ip6_pktopts *opt) 2312 { 2313 2314 bzero(opt, sizeof(*opt)); 2315 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2316 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2317 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2318 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2319 } 2320 2321 void 2322 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2323 { 2324 if (pktopt == NULL) 2325 return; 2326 2327 if (optname == -1 || optname == IPV6_PKTINFO) { 2328 if (pktopt->ip6po_pktinfo) 2329 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2330 pktopt->ip6po_pktinfo = NULL; 2331 } 2332 if (optname == -1 || optname == IPV6_HOPLIMIT) 2333 pktopt->ip6po_hlim = -1; 2334 if (optname == -1 || optname == IPV6_TCLASS) 2335 pktopt->ip6po_tclass = -1; 2336 if (optname == -1 || optname == IPV6_NEXTHOP) { 2337 if (pktopt->ip6po_nextroute.ro_rt) { 2338 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2339 pktopt->ip6po_nextroute.ro_rt = NULL; 2340 } 2341 if (pktopt->ip6po_nexthop) 2342 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2343 pktopt->ip6po_nexthop = NULL; 2344 } 2345 if (optname == -1 || optname == IPV6_HOPOPTS) { 2346 if (pktopt->ip6po_hbh) 2347 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2348 pktopt->ip6po_hbh = NULL; 2349 } 2350 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2351 if (pktopt->ip6po_dest1) 2352 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2353 pktopt->ip6po_dest1 = NULL; 2354 } 2355 if (optname == -1 || optname == IPV6_RTHDR) { 2356 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2357 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2358 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2359 if (pktopt->ip6po_route.ro_rt) { 2360 RTFREE(pktopt->ip6po_route.ro_rt); 2361 pktopt->ip6po_route.ro_rt = NULL; 2362 } 2363 } 2364 if (optname == -1 || optname == IPV6_DSTOPTS) { 2365 if (pktopt->ip6po_dest2) 2366 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2367 pktopt->ip6po_dest2 = NULL; 2368 } 2369 } 2370 2371 #define PKTOPT_EXTHDRCPY(type) \ 2372 do {\ 2373 if (src->type) {\ 2374 int hlen =\ 2375 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2376 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2377 if (dst->type == NULL)\ 2378 goto bad;\ 2379 bcopy(src->type, dst->type, hlen);\ 2380 }\ 2381 } while (0) 2382 2383 struct ip6_pktopts * 2384 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2385 { 2386 struct ip6_pktopts *dst; 2387 2388 if (src == NULL) { 2389 kprintf("ip6_clearpktopts: invalid argument\n"); 2390 return (NULL); 2391 } 2392 2393 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2394 if (dst == NULL) 2395 return (NULL); 2396 2397 dst->ip6po_hlim = src->ip6po_hlim; 2398 if (src->ip6po_pktinfo) { 2399 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2400 M_IP6OPT, canwait); 2401 if (dst->ip6po_pktinfo == NULL) 2402 goto bad; 2403 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2404 } 2405 if (src->ip6po_nexthop) { 2406 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2407 M_IP6OPT, canwait); 2408 if (dst->ip6po_nexthop == NULL) 2409 goto bad; 2410 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2411 src->ip6po_nexthop->sa_len); 2412 } 2413 PKTOPT_EXTHDRCPY(ip6po_hbh); 2414 PKTOPT_EXTHDRCPY(ip6po_dest1); 2415 PKTOPT_EXTHDRCPY(ip6po_dest2); 2416 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2417 return (dst); 2418 2419 bad: 2420 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2421 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2422 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2423 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2424 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2425 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2426 kfree(dst, M_IP6OPT); 2427 return (NULL); 2428 } 2429 2430 static int 2431 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2432 { 2433 if (dst == NULL || src == NULL) { 2434 #ifdef DIAGNOSTIC 2435 kprintf("ip6_clearpktopts: invalid argument\n"); 2436 #endif 2437 return (EINVAL); 2438 } 2439 2440 dst->ip6po_hlim = src->ip6po_hlim; 2441 dst->ip6po_tclass = src->ip6po_tclass; 2442 dst->ip6po_flags = src->ip6po_flags; 2443 if (src->ip6po_pktinfo) { 2444 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2445 M_IP6OPT, canwait); 2446 if (dst->ip6po_pktinfo == NULL) 2447 goto bad; 2448 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2449 } 2450 if (src->ip6po_nexthop) { 2451 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2452 M_IP6OPT, canwait); 2453 if (dst->ip6po_nexthop == NULL) 2454 goto bad; 2455 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2456 src->ip6po_nexthop->sa_len); 2457 } 2458 PKTOPT_EXTHDRCPY(ip6po_hbh); 2459 PKTOPT_EXTHDRCPY(ip6po_dest1); 2460 PKTOPT_EXTHDRCPY(ip6po_dest2); 2461 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2462 return (0); 2463 2464 bad: 2465 ip6_clearpktopts(dst, -1); 2466 return (ENOBUFS); 2467 } 2468 #undef PKTOPT_EXTHDRCPY 2469 2470 void 2471 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2472 { 2473 if (pktopt == NULL) 2474 return; 2475 2476 ip6_clearpktopts(pktopt, -1); 2477 2478 kfree(pktopt, M_IP6OPT); 2479 } 2480 2481 /* 2482 * Set the IP6 multicast options in response to user setsockopt(). 2483 */ 2484 static int 2485 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2486 { 2487 int error = 0; 2488 u_int loop, ifindex; 2489 struct ipv6_mreq *mreq; 2490 struct ifnet *ifp; 2491 struct ip6_moptions *im6o = *im6op; 2492 struct route_in6 ro; 2493 struct sockaddr_in6 *dst; 2494 struct in6_multi_mship *imm; 2495 struct thread *td = curthread; /* XXX */ 2496 2497 if (im6o == NULL) { 2498 /* 2499 * No multicast option buffer attached to the pcb; 2500 * allocate one and initialize to default values. 2501 */ 2502 im6o = (struct ip6_moptions *) 2503 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2504 2505 *im6op = im6o; 2506 im6o->im6o_multicast_ifp = NULL; 2507 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2508 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2509 LIST_INIT(&im6o->im6o_memberships); 2510 } 2511 2512 switch (optname) { 2513 2514 case IPV6_MULTICAST_IF: 2515 /* 2516 * Select the interface for outgoing multicast packets. 2517 */ 2518 if (m == NULL || m->m_len != sizeof(u_int)) { 2519 error = EINVAL; 2520 break; 2521 } 2522 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2523 if (ifindex < 0 || if_index < ifindex) { 2524 error = ENXIO; /* XXX EINVAL? */ 2525 break; 2526 } 2527 ifp = ifindex2ifnet[ifindex]; 2528 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2529 error = EADDRNOTAVAIL; 2530 break; 2531 } 2532 im6o->im6o_multicast_ifp = ifp; 2533 break; 2534 2535 case IPV6_MULTICAST_HOPS: 2536 { 2537 /* 2538 * Set the IP6 hoplimit for outgoing multicast packets. 2539 */ 2540 int optval; 2541 if (m == NULL || m->m_len != sizeof(int)) { 2542 error = EINVAL; 2543 break; 2544 } 2545 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2546 if (optval < -1 || optval >= 256) 2547 error = EINVAL; 2548 else if (optval == -1) 2549 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2550 else 2551 im6o->im6o_multicast_hlim = optval; 2552 break; 2553 } 2554 2555 case IPV6_MULTICAST_LOOP: 2556 /* 2557 * Set the loopback flag for outgoing multicast packets. 2558 * Must be zero or one. 2559 */ 2560 if (m == NULL || m->m_len != sizeof(u_int)) { 2561 error = EINVAL; 2562 break; 2563 } 2564 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2565 if (loop > 1) { 2566 error = EINVAL; 2567 break; 2568 } 2569 im6o->im6o_multicast_loop = loop; 2570 break; 2571 2572 case IPV6_JOIN_GROUP: 2573 /* 2574 * Add a multicast group membership. 2575 * Group must be a valid IP6 multicast address. 2576 */ 2577 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2578 error = EINVAL; 2579 break; 2580 } 2581 mreq = mtod(m, struct ipv6_mreq *); 2582 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2583 /* 2584 * We use the unspecified address to specify to accept 2585 * all multicast addresses. Only super user is allowed 2586 * to do this. 2587 */ 2588 if (priv_check(td, PRIV_ROOT)) 2589 { 2590 error = EACCES; 2591 break; 2592 } 2593 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2594 error = EINVAL; 2595 break; 2596 } 2597 2598 /* 2599 * If the interface is specified, validate it. 2600 */ 2601 if (mreq->ipv6mr_interface < 0 2602 || if_index < mreq->ipv6mr_interface) { 2603 error = ENXIO; /* XXX EINVAL? */ 2604 break; 2605 } 2606 /* 2607 * If no interface was explicitly specified, choose an 2608 * appropriate one according to the given multicast address. 2609 */ 2610 if (mreq->ipv6mr_interface == 0) { 2611 /* 2612 * If the multicast address is in node-local scope, 2613 * the interface should be a loopback interface. 2614 * Otherwise, look up the routing table for the 2615 * address, and choose the outgoing interface. 2616 * XXX: is it a good approach? 2617 */ 2618 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2619 ifp = &loif[0]; 2620 } else { 2621 ro.ro_rt = NULL; 2622 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2623 bzero(dst, sizeof(*dst)); 2624 dst->sin6_len = sizeof(struct sockaddr_in6); 2625 dst->sin6_family = AF_INET6; 2626 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2627 rtalloc((struct route *)&ro); 2628 if (ro.ro_rt == NULL) { 2629 error = EADDRNOTAVAIL; 2630 break; 2631 } 2632 ifp = ro.ro_rt->rt_ifp; 2633 rtfree(ro.ro_rt); 2634 } 2635 } else 2636 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2637 2638 /* 2639 * See if we found an interface, and confirm that it 2640 * supports multicast 2641 */ 2642 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2643 error = EADDRNOTAVAIL; 2644 break; 2645 } 2646 /* 2647 * Put interface index into the multicast address, 2648 * if the address has link-local scope. 2649 */ 2650 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2651 mreq->ipv6mr_multiaddr.s6_addr16[1] 2652 = htons(mreq->ipv6mr_interface); 2653 } 2654 /* 2655 * See if the membership already exists. 2656 */ 2657 for (imm = im6o->im6o_memberships.lh_first; 2658 imm != NULL; imm = imm->i6mm_chain.le_next) 2659 if (imm->i6mm_maddr->in6m_ifp == ifp && 2660 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2661 &mreq->ipv6mr_multiaddr)) 2662 break; 2663 if (imm != NULL) { 2664 error = EADDRINUSE; 2665 break; 2666 } 2667 /* 2668 * Everything looks good; add a new record to the multicast 2669 * address list for the given interface. 2670 */ 2671 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2672 if ((imm->i6mm_maddr = 2673 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2674 kfree(imm, M_IPMADDR); 2675 break; 2676 } 2677 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2678 break; 2679 2680 case IPV6_LEAVE_GROUP: 2681 /* 2682 * Drop a multicast group membership. 2683 * Group must be a valid IP6 multicast address. 2684 */ 2685 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2686 error = EINVAL; 2687 break; 2688 } 2689 mreq = mtod(m, struct ipv6_mreq *); 2690 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2691 if (priv_check(td, PRIV_ROOT)) { 2692 error = EACCES; 2693 break; 2694 } 2695 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2696 error = EINVAL; 2697 break; 2698 } 2699 /* 2700 * If an interface address was specified, get a pointer 2701 * to its ifnet structure. 2702 */ 2703 if (mreq->ipv6mr_interface < 0 2704 || if_index < mreq->ipv6mr_interface) { 2705 error = ENXIO; /* XXX EINVAL? */ 2706 break; 2707 } 2708 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2709 /* 2710 * Put interface index into the multicast address, 2711 * if the address has link-local scope. 2712 */ 2713 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2714 mreq->ipv6mr_multiaddr.s6_addr16[1] 2715 = htons(mreq->ipv6mr_interface); 2716 } 2717 /* 2718 * Find the membership in the membership list. 2719 */ 2720 for (imm = im6o->im6o_memberships.lh_first; 2721 imm != NULL; imm = imm->i6mm_chain.le_next) { 2722 if ((ifp == NULL || 2723 imm->i6mm_maddr->in6m_ifp == ifp) && 2724 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2725 &mreq->ipv6mr_multiaddr)) 2726 break; 2727 } 2728 if (imm == NULL) { 2729 /* Unable to resolve interface */ 2730 error = EADDRNOTAVAIL; 2731 break; 2732 } 2733 /* 2734 * Give up the multicast address record to which the 2735 * membership points. 2736 */ 2737 LIST_REMOVE(imm, i6mm_chain); 2738 in6_delmulti(imm->i6mm_maddr); 2739 kfree(imm, M_IPMADDR); 2740 break; 2741 2742 default: 2743 error = EOPNOTSUPP; 2744 break; 2745 } 2746 2747 /* 2748 * If all options have default values, no need to keep the mbuf. 2749 */ 2750 if (im6o->im6o_multicast_ifp == NULL && 2751 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2752 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2753 im6o->im6o_memberships.lh_first == NULL) { 2754 kfree(*im6op, M_IPMOPTS); 2755 *im6op = NULL; 2756 } 2757 2758 return (error); 2759 } 2760 2761 /* 2762 * Return the IP6 multicast options in response to user getsockopt(). 2763 */ 2764 static int 2765 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2766 { 2767 u_int *hlim, *loop, *ifindex; 2768 2769 *mp = m_get(M_WAITOK, MT_HEADER); /* XXX */ 2770 2771 switch (optname) { 2772 2773 case IPV6_MULTICAST_IF: 2774 ifindex = mtod(*mp, u_int *); 2775 (*mp)->m_len = sizeof(u_int); 2776 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2777 *ifindex = 0; 2778 else 2779 *ifindex = im6o->im6o_multicast_ifp->if_index; 2780 return (0); 2781 2782 case IPV6_MULTICAST_HOPS: 2783 hlim = mtod(*mp, u_int *); 2784 (*mp)->m_len = sizeof(u_int); 2785 if (im6o == NULL) 2786 *hlim = ip6_defmcasthlim; 2787 else 2788 *hlim = im6o->im6o_multicast_hlim; 2789 return (0); 2790 2791 case IPV6_MULTICAST_LOOP: 2792 loop = mtod(*mp, u_int *); 2793 (*mp)->m_len = sizeof(u_int); 2794 if (im6o == NULL) 2795 *loop = ip6_defmcasthlim; 2796 else 2797 *loop = im6o->im6o_multicast_loop; 2798 return (0); 2799 2800 default: 2801 return (EOPNOTSUPP); 2802 } 2803 } 2804 2805 /* 2806 * Discard the IP6 multicast options. 2807 */ 2808 void 2809 ip6_freemoptions(struct ip6_moptions *im6o) 2810 { 2811 struct in6_multi_mship *imm; 2812 2813 if (im6o == NULL) 2814 return; 2815 2816 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2817 LIST_REMOVE(imm, i6mm_chain); 2818 if (imm->i6mm_maddr) 2819 in6_delmulti(imm->i6mm_maddr); 2820 kfree(imm, M_IPMADDR); 2821 } 2822 kfree(im6o, M_IPMOPTS); 2823 } 2824 2825 /* 2826 * Set a particular packet option, as a sticky option or an ancillary data 2827 * item. "len" can be 0 only when it's a sticky option. 2828 * We have 4 cases of combination of "sticky" and "cmsg": 2829 * "sticky=0, cmsg=0": impossible 2830 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2831 * "sticky=1, cmsg=0": RFC3542 socket option 2832 * "sticky=1, cmsg=1": RFC2292 socket option 2833 */ 2834 static int 2835 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2836 int sticky, int cmsg, int uproto, int priv) 2837 { 2838 int minmtupolicy, preftemp; 2839 //int error; 2840 2841 if (!sticky && !cmsg) { 2842 kprintf("ip6_setpktoption: impossible case\n"); 2843 return (EINVAL); 2844 } 2845 2846 /* 2847 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2848 * not be specified in the context of RFC3542. Conversely, 2849 * RFC3542 types should not be specified in the context of RFC2292. 2850 */ 2851 if (!cmsg) { 2852 switch (optname) { 2853 case IPV6_2292PKTINFO: 2854 case IPV6_2292HOPLIMIT: 2855 case IPV6_2292NEXTHOP: 2856 case IPV6_2292HOPOPTS: 2857 case IPV6_2292DSTOPTS: 2858 case IPV6_2292RTHDR: 2859 case IPV6_2292PKTOPTIONS: 2860 return (ENOPROTOOPT); 2861 } 2862 } 2863 if (sticky && cmsg) { 2864 switch (optname) { 2865 case IPV6_PKTINFO: 2866 case IPV6_HOPLIMIT: 2867 case IPV6_NEXTHOP: 2868 case IPV6_HOPOPTS: 2869 case IPV6_DSTOPTS: 2870 case IPV6_RTHDRDSTOPTS: 2871 case IPV6_RTHDR: 2872 case IPV6_USE_MIN_MTU: 2873 case IPV6_DONTFRAG: 2874 case IPV6_TCLASS: 2875 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2876 return (ENOPROTOOPT); 2877 } 2878 } 2879 2880 switch (optname) { 2881 case IPV6_2292PKTINFO: 2882 case IPV6_PKTINFO: 2883 { 2884 struct in6_pktinfo *pktinfo; 2885 if (len != sizeof(struct in6_pktinfo)) 2886 return (EINVAL); 2887 pktinfo = (struct in6_pktinfo *)buf; 2888 2889 /* 2890 * An application can clear any sticky IPV6_PKTINFO option by 2891 * doing a "regular" setsockopt with ipi6_addr being 2892 * in6addr_any and ipi6_ifindex being zero. 2893 * [RFC 3542, Section 6] 2894 */ 2895 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2896 pktinfo->ipi6_ifindex == 0 && 2897 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2898 ip6_clearpktopts(opt, optname); 2899 break; 2900 } 2901 2902 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2903 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2904 return (EINVAL); 2905 } 2906 2907 /* validate the interface index if specified. */ 2908 if (pktinfo->ipi6_ifindex > if_index || 2909 pktinfo->ipi6_ifindex < 0) { 2910 return (ENXIO); 2911 } 2912 /* 2913 * Check if the requested source address is indeed a 2914 * unicast address assigned to the node, and can be 2915 * used as the packet's source address. 2916 */ 2917 if (opt->ip6po_pktinfo != NULL && 2918 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2919 struct in6_ifaddr *ia6; 2920 struct sockaddr_in6 sin6; 2921 2922 bzero(&sin6, sizeof(sin6)); 2923 sin6.sin6_len = sizeof(sin6); 2924 sin6.sin6_family = AF_INET6; 2925 sin6.sin6_addr = 2926 opt->ip6po_pktinfo->ipi6_addr; 2927 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2928 if (ia6 == NULL || 2929 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2930 IN6_IFF_NOTREADY)) != 0) 2931 return (EADDRNOTAVAIL); 2932 } 2933 2934 /* 2935 * We store the address anyway, and let in6_selectsrc() 2936 * validate the specified address. This is because ipi6_addr 2937 * may not have enough information about its scope zone, and 2938 * we may need additional information (such as outgoing 2939 * interface or the scope zone of a destination address) to 2940 * disambiguate the scope. 2941 * XXX: the delay of the validation may confuse the 2942 * application when it is used as a sticky option. 2943 */ 2944 if (opt->ip6po_pktinfo == NULL) { 2945 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2946 M_IP6OPT, M_NOWAIT); 2947 if (opt->ip6po_pktinfo == NULL) 2948 return (ENOBUFS); 2949 } 2950 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2951 break; 2952 } 2953 2954 case IPV6_2292HOPLIMIT: 2955 case IPV6_HOPLIMIT: 2956 { 2957 int *hlimp; 2958 2959 /* 2960 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2961 * to simplify the ordering among hoplimit options. 2962 */ 2963 if (optname == IPV6_HOPLIMIT && sticky) 2964 return (ENOPROTOOPT); 2965 2966 if (len != sizeof(int)) 2967 return (EINVAL); 2968 hlimp = (int *)buf; 2969 if (*hlimp < -1 || *hlimp > 255) 2970 return (EINVAL); 2971 2972 opt->ip6po_hlim = *hlimp; 2973 break; 2974 } 2975 2976 case IPV6_TCLASS: 2977 { 2978 int tclass; 2979 2980 if (len != sizeof(int)) 2981 return (EINVAL); 2982 tclass = *(int *)buf; 2983 if (tclass < -1 || tclass > 255) 2984 return (EINVAL); 2985 2986 opt->ip6po_tclass = tclass; 2987 break; 2988 } 2989 2990 case IPV6_2292NEXTHOP: 2991 case IPV6_NEXTHOP: 2992 if (!priv) 2993 return (EPERM); 2994 2995 if (len == 0) { /* just remove the option */ 2996 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2997 break; 2998 } 2999 3000 /* check if cmsg_len is large enough for sa_len */ 3001 if (len < sizeof(struct sockaddr) || len < *buf) 3002 return (EINVAL); 3003 3004 switch (((struct sockaddr *)buf)->sa_family) { 3005 case AF_INET6: 3006 { 3007 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3008 //int error; 3009 3010 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3011 return (EINVAL); 3012 3013 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3014 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3015 return (EINVAL); 3016 } 3017 break; 3018 } 3019 case AF_LINK: /* should eventually be supported */ 3020 default: 3021 return (EAFNOSUPPORT); 3022 } 3023 3024 /* turn off the previous option, then set the new option. */ 3025 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3026 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3027 if (opt->ip6po_nexthop == NULL) 3028 return (ENOBUFS); 3029 bcopy(buf, opt->ip6po_nexthop, *buf); 3030 break; 3031 3032 case IPV6_2292HOPOPTS: 3033 case IPV6_HOPOPTS: 3034 { 3035 struct ip6_hbh *hbh; 3036 int hbhlen; 3037 3038 /* 3039 * XXX: We don't allow a non-privileged user to set ANY HbH 3040 * options, since per-option restriction has too much 3041 * overhead. 3042 */ 3043 if (!priv) 3044 return (EPERM); 3045 if (len == 0) { 3046 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3047 break; /* just remove the option */ 3048 } 3049 3050 /* message length validation */ 3051 if (len < sizeof(struct ip6_hbh)) 3052 return (EINVAL); 3053 hbh = (struct ip6_hbh *)buf; 3054 hbhlen = (hbh->ip6h_len + 1) << 3; 3055 if (len != hbhlen) 3056 return (EINVAL); 3057 3058 /* turn off the previous option, then set the new option. */ 3059 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3060 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3061 if (opt->ip6po_hbh == NULL) 3062 return (ENOBUFS); 3063 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3064 3065 break; 3066 } 3067 3068 case IPV6_2292DSTOPTS: 3069 case IPV6_DSTOPTS: 3070 case IPV6_RTHDRDSTOPTS: 3071 { 3072 struct ip6_dest *dest, **newdest = NULL; 3073 int destlen; 3074 if (!priv) 3075 return (EPERM); 3076 3077 if (len == 0) { 3078 ip6_clearpktopts(opt, optname); 3079 break; /* just remove the option */ 3080 } 3081 3082 /* message length validation */ 3083 if (len < sizeof(struct ip6_dest)) 3084 return (EINVAL); 3085 dest = (struct ip6_dest *)buf; 3086 destlen = (dest->ip6d_len + 1) << 3; 3087 if (len != destlen) 3088 return (EINVAL); 3089 3090 /* 3091 * Determine the position that the destination options header 3092 * should be inserted; before or after the routing header. 3093 */ 3094 switch (optname) { 3095 case IPV6_2292DSTOPTS: 3096 /* 3097 * The old advacned API is ambiguous on this point. 3098 * Our approach is to determine the position based 3099 * according to the existence of a routing header. 3100 * Note, however, that this depends on the order of the 3101 * extension headers in the ancillary data; the 1st 3102 * part of the destination options header must appear 3103 * before the routing header in the ancillary data, 3104 * too. 3105 * RFC3542 solved the ambiguity by introducing 3106 * separate ancillary data or option types. 3107 */ 3108 if (opt->ip6po_rthdr == NULL) 3109 newdest = &opt->ip6po_dest1; 3110 else 3111 newdest = &opt->ip6po_dest2; 3112 break; 3113 case IPV6_RTHDRDSTOPTS: 3114 newdest = &opt->ip6po_dest1; 3115 break; 3116 case IPV6_DSTOPTS: 3117 newdest = &opt->ip6po_dest2; 3118 break; 3119 } 3120 3121 /* turn off the previous option, then set the new option. */ 3122 ip6_clearpktopts(opt, optname); 3123 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3124 if (*newdest == NULL) 3125 return (ENOBUFS); 3126 bcopy(dest, *newdest, destlen); 3127 3128 break; 3129 } 3130 3131 case IPV6_2292RTHDR: 3132 case IPV6_RTHDR: 3133 { 3134 struct ip6_rthdr *rth; 3135 int rthlen; 3136 3137 if (len == 0) { 3138 ip6_clearpktopts(opt, IPV6_RTHDR); 3139 break; /* just remove the option */ 3140 } 3141 3142 /* message length validation */ 3143 if (len < sizeof(struct ip6_rthdr)) 3144 return (EINVAL); 3145 rth = (struct ip6_rthdr *)buf; 3146 rthlen = (rth->ip6r_len + 1) << 3; 3147 if (len != rthlen) 3148 return (EINVAL); 3149 3150 switch (rth->ip6r_type) { 3151 default: 3152 return (EINVAL); /* not supported */ 3153 } 3154 3155 /* turn off the previous option */ 3156 ip6_clearpktopts(opt, IPV6_RTHDR); 3157 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3158 if (opt->ip6po_rthdr == NULL) 3159 return (ENOBUFS); 3160 bcopy(rth, opt->ip6po_rthdr, rthlen); 3161 3162 break; 3163 } 3164 3165 case IPV6_USE_MIN_MTU: 3166 if (len != sizeof(int)) 3167 return (EINVAL); 3168 minmtupolicy = *(int *)buf; 3169 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3170 minmtupolicy != IP6PO_MINMTU_DISABLE && 3171 minmtupolicy != IP6PO_MINMTU_ALL) { 3172 return (EINVAL); 3173 } 3174 opt->ip6po_minmtu = minmtupolicy; 3175 break; 3176 3177 case IPV6_DONTFRAG: 3178 if (len != sizeof(int)) 3179 return (EINVAL); 3180 3181 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3182 /* 3183 * we ignore this option for TCP sockets. 3184 * (RFC3542 leaves this case unspecified.) 3185 */ 3186 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3187 } else 3188 opt->ip6po_flags |= IP6PO_DONTFRAG; 3189 break; 3190 3191 case IPV6_PREFER_TEMPADDR: 3192 if (len != sizeof(int)) 3193 return (EINVAL); 3194 preftemp = *(int *)buf; 3195 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3196 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3197 preftemp != IP6PO_TEMPADDR_PREFER) { 3198 return (EINVAL); 3199 } 3200 opt->ip6po_prefer_tempaddr = preftemp; 3201 break; 3202 3203 default: 3204 return (ENOPROTOOPT); 3205 } /* end of switch */ 3206 3207 return (0); 3208 } 3209 3210 3211 /* 3212 * Set IPv6 outgoing packet options based on advanced API. 3213 */ 3214 int 3215 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3216 struct ip6_pktopts *stickyopt, int uproto, int priv) 3217 { 3218 struct cmsghdr *cm = NULL; 3219 3220 if (control == NULL || opt == NULL) 3221 return (EINVAL); 3222 3223 init_ip6pktopts(opt); 3224 3225 /* 3226 * XXX: Currently, we assume all the optional information is stored 3227 * in a single mbuf. 3228 */ 3229 if (stickyopt) { 3230 int error; 3231 3232 /* 3233 * If stickyopt is provided, make a local copy of the options 3234 * for this particular packet, then override them by ancillary 3235 * objects. 3236 * XXX: copypktopts() does not copy the cached route to a next 3237 * hop (if any). This is not very good in terms of efficiency, 3238 * but we can allow this since this option should be rarely 3239 * used. 3240 */ 3241 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3242 return (error); 3243 } 3244 3245 /* 3246 * XXX: Currently, we assume all the optional information is stored 3247 * in a single mbuf. 3248 */ 3249 if (control->m_next) 3250 return (EINVAL); 3251 3252 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3253 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3254 int error; 3255 3256 if (control->m_len < CMSG_LEN(0)) 3257 return (EINVAL); 3258 3259 cm = mtod(control, struct cmsghdr *); 3260 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3261 return (EINVAL); 3262 if (cm->cmsg_level != IPPROTO_IPV6) 3263 continue; 3264 3265 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3266 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3267 if (error) 3268 return (error); 3269 } 3270 3271 return (0); 3272 } 3273 3274 /* 3275 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3276 * packet to the input queue of a specified interface. Note that this 3277 * calls the output routine of the loopback "driver", but with an interface 3278 * pointer that might NOT be &loif -- easier than replicating that code here. 3279 */ 3280 void 3281 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3282 { 3283 struct mbuf *copym; 3284 struct ip6_hdr *ip6; 3285 3286 copym = m_copy(m, 0, M_COPYALL); 3287 if (copym == NULL) 3288 return; 3289 3290 /* 3291 * Make sure to deep-copy IPv6 header portion in case the data 3292 * is in an mbuf cluster, so that we can safely override the IPv6 3293 * header portion later. 3294 */ 3295 if ((copym->m_flags & M_EXT) != 0 || 3296 copym->m_len < sizeof(struct ip6_hdr)) { 3297 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3298 if (copym == NULL) 3299 return; 3300 } 3301 3302 #ifdef DIAGNOSTIC 3303 if (copym->m_len < sizeof(*ip6)) { 3304 m_freem(copym); 3305 return; 3306 } 3307 #endif 3308 3309 ip6 = mtod(copym, struct ip6_hdr *); 3310 /* 3311 * clear embedded scope identifiers if necessary. 3312 * in6_clearscope will touch the addresses only when necessary. 3313 */ 3314 in6_clearscope(&ip6->ip6_src); 3315 in6_clearscope(&ip6->ip6_dst); 3316 3317 if_simloop(ifp, copym, dst->sin6_family, 0); 3318 } 3319 3320 /* 3321 * Separate the IPv6 header from the payload into its own mbuf. 3322 * 3323 * Returns the new mbuf chain or the original mbuf if no payload. 3324 * Returns NULL if can't allocate new mbuf for header. 3325 */ 3326 static struct mbuf * 3327 ip6_splithdr(struct mbuf *m) 3328 { 3329 struct mbuf *mh; 3330 3331 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3332 return (m); 3333 3334 MGETHDR(mh, M_NOWAIT, MT_HEADER); 3335 if (mh == NULL) 3336 return (NULL); 3337 mh->m_len = sizeof(struct ip6_hdr); 3338 M_MOVE_PKTHDR(mh, m); 3339 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3340 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3341 m->m_data += sizeof(struct ip6_hdr); 3342 m->m_len -= sizeof(struct ip6_hdr); 3343 mh->m_next = m; 3344 return (mh); 3345 } 3346 3347 /* 3348 * Compute IPv6 extension header length. 3349 */ 3350 int 3351 ip6_optlen(struct in6pcb *in6p) 3352 { 3353 int len; 3354 3355 if (!in6p->in6p_outputopts) 3356 return 0; 3357 3358 len = 0; 3359 #define elen(x) \ 3360 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3361 3362 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3363 if (in6p->in6p_outputopts->ip6po_rthdr) 3364 /* dest1 is valid with rthdr only */ 3365 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3366 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3367 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3368 return len; 3369 #undef elen 3370 } 3371