1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/ip6_output.c,v 1.37 2008/09/04 09:08:22 hasso Exp $ */ 3 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 67 */ 68 69 #include "opt_ip6fw.h" 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 74 #include <sys/param.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/errno.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/pfil.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet6/in6_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet6/nd6.h> 97 #include <netinet6/ip6protosw.h> 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #ifdef INET6 102 #include <netinet6/ipsec6.h> 103 #endif 104 #include <netproto/key/key.h> 105 #endif /* IPSEC */ 106 107 #ifdef FAST_IPSEC 108 #include <netproto/ipsec/ipsec.h> 109 #include <netproto/ipsec/ipsec6.h> 110 #include <netproto/ipsec/key.h> 111 #endif 112 113 #include <net/ip6fw/ip6_fw.h> 114 115 #include <net/net_osdep.h> 116 117 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 118 119 struct ip6_exthdrs { 120 struct mbuf *ip6e_ip6; 121 struct mbuf *ip6e_hbh; 122 struct mbuf *ip6e_dest1; 123 struct mbuf *ip6e_rthdr; 124 struct mbuf *ip6e_dest2; 125 }; 126 127 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 128 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 129 int, int, int, int); 130 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 131 struct socket *, struct sockopt *); 132 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 133 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 134 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 135 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 136 struct ifnet *, struct in6_addr *, u_long *, int *); 137 static int copyexthdr (void *, struct mbuf **); 138 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 139 struct ip6_frag **); 140 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 141 static struct mbuf *ip6_splithdr (struct mbuf *); 142 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 143 144 /* 145 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 146 * header (with pri, len, nxt, hlim, src, dst). 147 * This function may modify ver and hlim only. 148 * The mbuf chain containing the packet will be freed. 149 * The mbuf opt, if present, will not be freed. 150 * 151 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 152 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 153 * which is rt_rmx.rmx_mtu. 154 */ 155 int 156 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 157 int flags, struct ip6_moptions *im6o, 158 struct ifnet **ifpp, /* XXX: just for statistics */ 159 struct inpcb *inp) 160 { 161 struct ip6_hdr *ip6, *mhip6; 162 struct ifnet *ifp, *origifp; 163 struct mbuf *m = m0; 164 struct mbuf *mprev; 165 u_char *nexthdrp; 166 int hlen, tlen, len, off; 167 struct route_in6 ip6route; 168 struct sockaddr_in6 *dst; 169 int error = 0; 170 struct in6_ifaddr *ia = NULL; 171 u_long mtu; 172 int alwaysfrag, dontfrag; 173 u_int32_t optlen, plen = 0, unfragpartlen; 174 struct ip6_exthdrs exthdrs; 175 struct in6_addr finaldst; 176 struct route_in6 *ro_pmtu = NULL; 177 boolean_t hdrsplit = FALSE; 178 boolean_t needipsec = FALSE; 179 #ifdef IPSEC 180 boolean_t needipsectun = FALSE; 181 struct secpolicy *sp = NULL; 182 struct socket *so = inp ? inp->inp_socket : NULL; 183 184 ip6 = mtod(m, struct ip6_hdr *); 185 #endif 186 #ifdef FAST_IPSEC 187 boolean_t needipsectun = FALSE; 188 struct secpolicy *sp = NULL; 189 190 ip6 = mtod(m, struct ip6_hdr *); 191 #endif 192 193 bzero(&exthdrs, sizeof exthdrs); 194 195 if (opt) { 196 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 197 goto freehdrs; 198 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 199 goto freehdrs; 200 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 201 goto freehdrs; 202 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 203 goto freehdrs; 204 } 205 206 #ifdef IPSEC 207 /* get a security policy for this packet */ 208 if (so == NULL) 209 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 210 else 211 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 212 213 if (sp == NULL) { 214 ipsec6stat.out_inval++; 215 goto freehdrs; 216 } 217 218 error = 0; 219 220 /* check policy */ 221 switch (sp->policy) { 222 case IPSEC_POLICY_DISCARD: 223 /* 224 * This packet is just discarded. 225 */ 226 ipsec6stat.out_polvio++; 227 goto freehdrs; 228 229 case IPSEC_POLICY_BYPASS: 230 case IPSEC_POLICY_NONE: 231 /* no need to do IPsec. */ 232 needipsec = FALSE; 233 break; 234 235 case IPSEC_POLICY_IPSEC: 236 if (sp->req == NULL) { 237 error = key_spdacquire(sp); /* acquire a policy */ 238 goto freehdrs; 239 } 240 needipsec = TRUE; 241 break; 242 243 case IPSEC_POLICY_ENTRUST: 244 default: 245 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 246 } 247 #endif /* IPSEC */ 248 #ifdef FAST_IPSEC 249 /* get a security policy for this packet */ 250 if (inp == NULL) 251 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 252 else 253 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 254 255 if (sp == NULL) { 256 newipsecstat.ips_out_inval++; 257 goto freehdrs; 258 } 259 260 error = 0; 261 262 /* check policy */ 263 switch (sp->policy) { 264 case IPSEC_POLICY_DISCARD: 265 /* 266 * This packet is just discarded. 267 */ 268 newipsecstat.ips_out_polvio++; 269 goto freehdrs; 270 271 case IPSEC_POLICY_BYPASS: 272 case IPSEC_POLICY_NONE: 273 /* no need to do IPsec. */ 274 needipsec = FALSE; 275 break; 276 277 case IPSEC_POLICY_IPSEC: 278 if (sp->req == NULL) { 279 error = key_spdacquire(sp); /* acquire a policy */ 280 goto freehdrs; 281 } 282 needipsec = TRUE; 283 break; 284 285 case IPSEC_POLICY_ENTRUST: 286 default: 287 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 288 } 289 #endif /* FAST_IPSEC */ 290 291 /* 292 * Calculate the total length of the extension header chain. 293 * Keep the length of the unfragmentable part for fragmentation. 294 */ 295 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 296 m_lengthm(exthdrs.ip6e_dest1, NULL) + 297 m_lengthm(exthdrs.ip6e_rthdr, NULL); 298 299 unfragpartlen = optlen + sizeof(struct ip6_hdr); 300 301 /* NOTE: we don't add AH/ESP length here. do that later. */ 302 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 303 304 /* 305 * If we need IPsec, or there is at least one extension header, 306 * separate IP6 header from the payload. 307 */ 308 if ((needipsec || optlen) && !hdrsplit) { 309 exthdrs.ip6e_ip6 = ip6_splithdr(m); 310 if (exthdrs.ip6e_ip6 == NULL) { 311 error = ENOBUFS; 312 goto freehdrs; 313 } 314 m = exthdrs.ip6e_ip6; 315 hdrsplit = TRUE; 316 } 317 318 /* adjust pointer */ 319 ip6 = mtod(m, struct ip6_hdr *); 320 321 /* adjust mbuf packet header length */ 322 m->m_pkthdr.len += optlen; 323 plen = m->m_pkthdr.len - sizeof(*ip6); 324 325 /* If this is a jumbo payload, insert a jumbo payload option. */ 326 if (plen > IPV6_MAXPACKET) { 327 if (!hdrsplit) { 328 exthdrs.ip6e_ip6 = ip6_splithdr(m); 329 if (exthdrs.ip6e_ip6 == NULL) { 330 error = ENOBUFS; 331 goto freehdrs; 332 } 333 m = exthdrs.ip6e_ip6; 334 hdrsplit = TRUE; 335 } 336 /* adjust pointer */ 337 ip6 = mtod(m, struct ip6_hdr *); 338 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 339 goto freehdrs; 340 ip6->ip6_plen = 0; 341 } else 342 ip6->ip6_plen = htons(plen); 343 344 /* 345 * Concatenate headers and fill in next header fields. 346 * Here we have, on "m" 347 * IPv6 payload 348 * and we insert headers accordingly. Finally, we should be getting: 349 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 350 * 351 * during the header composing process, "m" points to IPv6 header. 352 * "mprev" points to an extension header prior to esp. 353 */ 354 355 nexthdrp = &ip6->ip6_nxt; 356 mprev = m; 357 358 /* 359 * we treat dest2 specially. this makes IPsec processing 360 * much easier. the goal here is to make mprev point the 361 * mbuf prior to dest2. 362 * 363 * result: IPv6 dest2 payload 364 * m and mprev will point to IPv6 header. 365 */ 366 if (exthdrs.ip6e_dest2) { 367 if (!hdrsplit) 368 panic("assumption failed: hdr not split"); 369 exthdrs.ip6e_dest2->m_next = m->m_next; 370 m->m_next = exthdrs.ip6e_dest2; 371 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 372 ip6->ip6_nxt = IPPROTO_DSTOPTS; 373 } 374 375 /* 376 * Place m1 after mprev. 377 */ 378 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 379 do {\ 380 if (m1) {\ 381 if (!hdrsplit)\ 382 panic("assumption failed: hdr not split");\ 383 *mtod(m1, u_char *) = *nexthdrp;\ 384 *nexthdrp = (i);\ 385 nexthdrp = mtod(m1, u_char *);\ 386 m1->m_next = mprev->m_next;\ 387 mprev->m_next = m1;\ 388 mprev = m1;\ 389 }\ 390 } while (0) 391 392 /* 393 * result: IPv6 hbh dest1 rthdr dest2 payload 394 * m will point to IPv6 header. mprev will point to the 395 * extension header prior to dest2 (rthdr in the above case). 396 */ 397 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 399 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 400 401 #if defined(IPSEC) || defined(FAST_IPSEC) 402 if (needipsec) { 403 struct ipsec_output_state state; 404 int segleft_org = 0; 405 struct ip6_rthdr *rh = NULL; 406 407 /* 408 * pointers after IPsec headers are not valid any more. 409 * other pointers need a great care too. 410 * (IPsec routines should not mangle mbufs prior to AH/ESP) 411 */ 412 exthdrs.ip6e_dest2 = NULL; 413 414 if (exthdrs.ip6e_rthdr) { 415 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 416 segleft_org = rh->ip6r_segleft; 417 rh->ip6r_segleft = 0; 418 } 419 420 bzero(&state, sizeof state); 421 state.m = m; 422 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 423 &needipsectun); 424 m = state.m; 425 if (error) { 426 /* mbuf is already reclaimed in ipsec6_output_trans. */ 427 m = NULL; 428 switch (error) { 429 case EHOSTUNREACH: 430 case ENETUNREACH: 431 case EMSGSIZE: 432 case ENOBUFS: 433 case ENOMEM: 434 break; 435 default: 436 kprintf("ip6_output (ipsec): error code %d\n", 437 error); 438 /* fall through */ 439 case ENOENT: 440 /* don't show these error codes to the user */ 441 error = 0; 442 break; 443 } 444 goto bad; 445 } 446 if (exthdrs.ip6e_rthdr) { 447 /* ah6_output doesn't modify mbuf chain */ 448 rh->ip6r_segleft = segleft_org; 449 } 450 } 451 #endif 452 453 /* 454 * If there is a routing header, replace destination address field 455 * with the first hop of the routing header. 456 */ 457 if (exthdrs.ip6e_rthdr) { 458 struct ip6_rthdr *rh; 459 460 finaldst = ip6->ip6_dst; 461 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 462 switch (rh->ip6r_type) { 463 default: /* is it possible? */ 464 error = EINVAL; 465 goto bad; 466 } 467 } 468 469 /* Source address validation */ 470 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 471 !(flags & IPV6_DADOUTPUT)) { 472 error = EOPNOTSUPP; 473 ip6stat.ip6s_badscope++; 474 goto bad; 475 } 476 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 477 error = EOPNOTSUPP; 478 ip6stat.ip6s_badscope++; 479 goto bad; 480 } 481 482 ip6stat.ip6s_localout++; 483 484 /* 485 * Route packet. 486 */ 487 if (ro == NULL) { 488 ro = &ip6route; 489 bzero(ro, sizeof(*ro)); 490 } 491 ro_pmtu = ro; 492 if (opt && opt->ip6po_rthdr) 493 ro = &opt->ip6po_route; 494 dst = (struct sockaddr_in6 *)&ro->ro_dst; 495 /* 496 * If there is a cached route, 497 * check that it is to the same destination 498 * and is still up. If not, free it and try again. 499 */ 500 if (ro->ro_rt != NULL && 501 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 502 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 503 RTFREE(ro->ro_rt); 504 ro->ro_rt = NULL; 505 } 506 if (ro->ro_rt == NULL) { 507 bzero(dst, sizeof(*dst)); 508 dst->sin6_family = AF_INET6; 509 dst->sin6_len = sizeof(struct sockaddr_in6); 510 dst->sin6_addr = ip6->ip6_dst; 511 } 512 #if defined(IPSEC) || defined(FAST_IPSEC) 513 if (needipsec && needipsectun) { 514 struct ipsec_output_state state; 515 516 /* 517 * All the extension headers will become inaccessible 518 * (since they can be encrypted). 519 * Don't panic, we need no more updates to extension headers 520 * on inner IPv6 packet (since they are now encapsulated). 521 * 522 * IPv6 [ESP|AH] IPv6 [extension headers] payload 523 */ 524 bzero(&exthdrs, sizeof(exthdrs)); 525 exthdrs.ip6e_ip6 = m; 526 527 bzero(&state, sizeof(state)); 528 state.m = m; 529 state.ro = (struct route *)ro; 530 state.dst = (struct sockaddr *)dst; 531 532 error = ipsec6_output_tunnel(&state, sp, flags); 533 534 m = state.m; 535 ro = (struct route_in6 *)state.ro; 536 dst = (struct sockaddr_in6 *)state.dst; 537 if (error) { 538 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 539 m0 = m = NULL; 540 m = NULL; 541 switch (error) { 542 case EHOSTUNREACH: 543 case ENETUNREACH: 544 case EMSGSIZE: 545 case ENOBUFS: 546 case ENOMEM: 547 break; 548 default: 549 kprintf("ip6_output (ipsec): error code %d\n", error); 550 /* fall through */ 551 case ENOENT: 552 /* don't show these error codes to the user */ 553 error = 0; 554 break; 555 } 556 goto bad; 557 } 558 559 exthdrs.ip6e_ip6 = m; 560 } 561 #endif 562 563 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 564 /* Unicast */ 565 566 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 567 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 568 /* xxx 569 * interface selection comes here 570 * if an interface is specified from an upper layer, 571 * ifp must point it. 572 */ 573 if (ro->ro_rt == NULL) { 574 /* 575 * non-bsdi always clone routes, if parent is 576 * PRF_CLONING. 577 */ 578 rtalloc((struct route *)ro); 579 } 580 if (ro->ro_rt == NULL) { 581 ip6stat.ip6s_noroute++; 582 error = EHOSTUNREACH; 583 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 584 goto bad; 585 } 586 ia = ifatoia6(ro->ro_rt->rt_ifa); 587 ifp = ro->ro_rt->rt_ifp; 588 ro->ro_rt->rt_use++; 589 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 590 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 591 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 592 593 in6_ifstat_inc(ifp, ifs6_out_request); 594 595 /* 596 * Check if the outgoing interface conflicts with 597 * the interface specified by ifi6_ifindex (if specified). 598 * Note that loopback interface is always okay. 599 * (this may happen when we are sending a packet to one of 600 * our own addresses.) 601 */ 602 if (opt && opt->ip6po_pktinfo 603 && opt->ip6po_pktinfo->ipi6_ifindex) { 604 if (!(ifp->if_flags & IFF_LOOPBACK) 605 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 606 ip6stat.ip6s_noroute++; 607 in6_ifstat_inc(ifp, ifs6_out_discard); 608 error = EHOSTUNREACH; 609 goto bad; 610 } 611 } 612 613 if (opt && opt->ip6po_hlim != -1) 614 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 615 } else { 616 /* Multicast */ 617 struct in6_multi *in6m; 618 619 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 620 621 /* 622 * See if the caller provided any multicast options 623 */ 624 ifp = NULL; 625 if (im6o != NULL) { 626 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 627 if (im6o->im6o_multicast_ifp != NULL) 628 ifp = im6o->im6o_multicast_ifp; 629 } else 630 ip6->ip6_hlim = ip6_defmcasthlim; 631 632 /* 633 * See if the caller provided the outgoing interface 634 * as an ancillary data. 635 * Boundary check for ifindex is assumed to be already done. 636 */ 637 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 638 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 639 640 /* 641 * If the destination is a node-local scope multicast, 642 * the packet should be loop-backed only. 643 */ 644 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 645 /* 646 * If the outgoing interface is already specified, 647 * it should be a loopback interface. 648 */ 649 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 650 ip6stat.ip6s_badscope++; 651 error = ENETUNREACH; /* XXX: better error? */ 652 /* XXX correct ifp? */ 653 in6_ifstat_inc(ifp, ifs6_out_discard); 654 goto bad; 655 } else { 656 ifp = &loif[0]; 657 } 658 } 659 660 if (opt && opt->ip6po_hlim != -1) 661 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 662 663 /* 664 * If caller did not provide an interface lookup a 665 * default in the routing table. This is either a 666 * default for the speicfied group (i.e. a host 667 * route), or a multicast default (a route for the 668 * ``net'' ff00::/8). 669 */ 670 if (ifp == NULL) { 671 if (ro->ro_rt == NULL) { 672 ro->ro_rt = 673 rtpurelookup((struct sockaddr *)&ro->ro_dst); 674 } 675 if (ro->ro_rt == NULL) { 676 ip6stat.ip6s_noroute++; 677 error = EHOSTUNREACH; 678 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 679 goto bad; 680 } 681 ia = ifatoia6(ro->ro_rt->rt_ifa); 682 ifp = ro->ro_rt->rt_ifp; 683 ro->ro_rt->rt_use++; 684 } 685 686 if (!(flags & IPV6_FORWARDING)) 687 in6_ifstat_inc(ifp, ifs6_out_request); 688 in6_ifstat_inc(ifp, ifs6_out_mcast); 689 690 /* 691 * Confirm that the outgoing interface supports multicast. 692 */ 693 if (!(ifp->if_flags & IFF_MULTICAST)) { 694 ip6stat.ip6s_noroute++; 695 in6_ifstat_inc(ifp, ifs6_out_discard); 696 error = ENETUNREACH; 697 goto bad; 698 } 699 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 700 if (in6m != NULL && 701 (im6o == NULL || im6o->im6o_multicast_loop)) { 702 /* 703 * If we belong to the destination multicast group 704 * on the outgoing interface, and the caller did not 705 * forbid loopback, loop back a copy. 706 */ 707 ip6_mloopback(ifp, m, dst); 708 } else { 709 /* 710 * If we are acting as a multicast router, perform 711 * multicast forwarding as if the packet had just 712 * arrived on the interface to which we are about 713 * to send. The multicast forwarding function 714 * recursively calls this function, using the 715 * IPV6_FORWARDING flag to prevent infinite recursion. 716 * 717 * Multicasts that are looped back by ip6_mloopback(), 718 * above, will be forwarded by the ip6_input() routine, 719 * if necessary. 720 */ 721 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 722 if (ip6_mforward(ip6, ifp, m) != 0) { 723 m_freem(m); 724 goto done; 725 } 726 } 727 } 728 /* 729 * Multicasts with a hoplimit of zero may be looped back, 730 * above, but must not be transmitted on a network. 731 * Also, multicasts addressed to the loopback interface 732 * are not sent -- the above call to ip6_mloopback() will 733 * loop back a copy if this host actually belongs to the 734 * destination group on the loopback interface. 735 */ 736 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 737 m_freem(m); 738 goto done; 739 } 740 } 741 742 /* 743 * Fill the outgoing inteface to tell the upper layer 744 * to increment per-interface statistics. 745 */ 746 if (ifpp) 747 *ifpp = ifp; 748 749 /* Determine path MTU. */ 750 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 751 &alwaysfrag)) != 0) 752 goto bad; 753 754 /* 755 * The caller of this function may specify to use the minimum MTU 756 * in some cases. 757 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 758 * setting. The logic is a bit complicated; by default, unicast 759 * packets will follow path MTU while multicast packets will be sent at 760 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 761 * including unicast ones will be sent at the minimum MTU. Multicast 762 * packets will always be sent at the minimum MTU unless 763 * IP6PO_MINMTU_DISABLE is explicitly specified. 764 * See RFC 3542 for more details. 765 */ 766 if (mtu > IPV6_MMTU) { 767 if ((flags & IPV6_MINMTU)) 768 mtu = IPV6_MMTU; 769 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 770 mtu = IPV6_MMTU; 771 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 772 (opt == NULL || 773 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 774 mtu = IPV6_MMTU; 775 } 776 } 777 778 /* Fake scoped addresses */ 779 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 780 /* 781 * If source or destination address is a scoped address, and 782 * the packet is going to be sent to a loopback interface, 783 * we should keep the original interface. 784 */ 785 786 /* 787 * XXX: this is a very experimental and temporary solution. 788 * We eventually have sockaddr_in6 and use the sin6_scope_id 789 * field of the structure here. 790 * We rely on the consistency between two scope zone ids 791 * of source and destination, which should already be assured. 792 * Larger scopes than link will be supported in the future. 793 */ 794 origifp = NULL; 795 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 796 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 797 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 798 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 799 /* 800 * XXX: origifp can be NULL even in those two cases above. 801 * For example, if we remove the (only) link-local address 802 * from the loopback interface, and try to send a link-local 803 * address without link-id information. Then the source 804 * address is ::1, and the destination address is the 805 * link-local address with its s6_addr16[1] being zero. 806 * What is worse, if the packet goes to the loopback interface 807 * by a default rejected route, the null pointer would be 808 * passed to looutput, and the kernel would hang. 809 * The following last resort would prevent such disaster. 810 */ 811 if (origifp == NULL) 812 origifp = ifp; 813 } 814 else 815 origifp = ifp; 816 /* 817 * clear embedded scope identifiers if necessary. 818 * in6_clearscope will touch the addresses only when necessary. 819 */ 820 in6_clearscope(&ip6->ip6_src); 821 in6_clearscope(&ip6->ip6_dst); 822 823 /* 824 * Check with the firewall... 825 */ 826 if (ip6_fw_enable && ip6_fw_chk_ptr) { 827 u_short port = 0; 828 829 m->m_pkthdr.rcvif = NULL; /* XXX */ 830 /* If ipfw says divert, we have to just drop packet */ 831 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 832 m_freem(m); 833 goto done; 834 } 835 if (!m) { 836 error = EACCES; 837 goto done; 838 } 839 } 840 841 /* 842 * If the outgoing packet contains a hop-by-hop options header, 843 * it must be examined and processed even by the source node. 844 * (RFC 2460, section 4.) 845 */ 846 if (exthdrs.ip6e_hbh) { 847 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 848 u_int32_t dummy1; /* XXX unused */ 849 u_int32_t dummy2; /* XXX unused */ 850 851 #ifdef DIAGNOSTIC 852 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 853 panic("ip6e_hbh is not continuous"); 854 #endif 855 /* 856 * XXX: if we have to send an ICMPv6 error to the sender, 857 * we need the M_LOOP flag since icmp6_error() expects 858 * the IPv6 and the hop-by-hop options header are 859 * continuous unless the flag is set. 860 */ 861 m->m_flags |= M_LOOP; 862 m->m_pkthdr.rcvif = ifp; 863 if (ip6_process_hopopts(m, 864 (u_int8_t *)(hbh + 1), 865 ((hbh->ip6h_len + 1) << 3) - 866 sizeof(struct ip6_hbh), 867 &dummy1, &dummy2) < 0) { 868 /* m was already freed at this point */ 869 error = EINVAL;/* better error? */ 870 goto done; 871 } 872 m->m_flags &= ~M_LOOP; /* XXX */ 873 m->m_pkthdr.rcvif = NULL; 874 } 875 876 /* 877 * Run through list of hooks for output packets. 878 */ 879 if (pfil_has_hooks(&inet6_pfil_hook)) { 880 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 881 if (error != 0 || m == NULL) 882 goto done; 883 ip6 = mtod(m, struct ip6_hdr *); 884 } 885 886 /* 887 * Send the packet to the outgoing interface. 888 * If necessary, do IPv6 fragmentation before sending. 889 * 890 * the logic here is rather complex: 891 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 892 * 1-a: send as is if tlen <= path mtu 893 * 1-b: fragment if tlen > path mtu 894 * 895 * 2: if user asks us not to fragment (dontfrag == 1) 896 * 2-a: send as is if tlen <= interface mtu 897 * 2-b: error if tlen > interface mtu 898 * 899 * 3: if we always need to attach fragment header (alwaysfrag == 1) 900 * always fragment 901 * 902 * 4: if dontfrag == 1 && alwaysfrag == 1 903 * error, as we cannot handle this conflicting request 904 */ 905 tlen = m->m_pkthdr.len; 906 907 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 908 dontfrag = 1; 909 else 910 dontfrag = 0; 911 if (dontfrag && alwaysfrag) { /* case 4 */ 912 /* conflicting request - can't transmit */ 913 error = EMSGSIZE; 914 goto bad; 915 } 916 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 917 /* 918 * Even if the DONTFRAG option is specified, we cannot send the 919 * packet when the data length is larger than the MTU of the 920 * outgoing interface. 921 * Notify the error by sending IPV6_PATHMTU ancillary data as 922 * well as returning an error code (the latter is not described 923 * in the API spec.) 924 */ 925 u_int32_t mtu32; 926 struct ip6ctlparam ip6cp; 927 928 mtu32 = (u_int32_t)mtu; 929 bzero(&ip6cp, sizeof(ip6cp)); 930 ip6cp.ip6c_cmdarg = (void *)&mtu32; 931 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 932 (void *)&ip6cp); 933 934 error = EMSGSIZE; 935 goto bad; 936 } 937 938 /* 939 * transmit packet without fragmentation 940 */ 941 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 942 struct in6_ifaddr *ia6; 943 944 ip6 = mtod(m, struct ip6_hdr *); 945 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 946 if (ia6) { 947 /* Record statistics for this interface address. */ 948 ia6->ia_ifa.if_opackets++; 949 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 950 } 951 #ifdef IPSEC 952 /* clean ipsec history once it goes out of the node */ 953 ipsec_delaux(m); 954 #endif 955 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 956 goto done; 957 } 958 959 /* 960 * try to fragment the packet. case 1-b and 3 961 */ 962 if (mtu < IPV6_MMTU) { 963 /* 964 * note that path MTU is never less than IPV6_MMTU 965 * (see icmp6_input). 966 */ 967 error = EMSGSIZE; 968 in6_ifstat_inc(ifp, ifs6_out_fragfail); 969 goto bad; 970 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 971 error = EMSGSIZE; 972 in6_ifstat_inc(ifp, ifs6_out_fragfail); 973 goto bad; 974 } else { 975 struct mbuf **mnext, *m_frgpart; 976 struct ip6_frag *ip6f; 977 u_int32_t id = htonl(ip6_id++); 978 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 979 u_char nextproto; 980 981 /* 982 * Too large for the destination or interface; 983 * fragment if possible. 984 * Must be able to put at least 8 bytes per fragment. 985 */ 986 hlen = unfragpartlen; 987 if (mtu > IPV6_MAXPACKET) 988 mtu = IPV6_MAXPACKET; 989 990 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 991 if (len < 8) { 992 error = EMSGSIZE; 993 in6_ifstat_inc(ifp, ifs6_out_fragfail); 994 goto bad; 995 } 996 997 /* 998 * Verify that we have any chance at all of being able to queue 999 * the packet or packet fragments 1000 */ 1001 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1002 < tlen /* - hlen */)) { 1003 error = ENOBUFS; 1004 ip6stat.ip6s_odropped++; 1005 goto bad; 1006 } 1007 1008 mnext = &m->m_nextpkt; 1009 1010 /* 1011 * Change the next header field of the last header in the 1012 * unfragmentable part. 1013 */ 1014 if (exthdrs.ip6e_rthdr) { 1015 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1016 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1017 } else if (exthdrs.ip6e_dest1) { 1018 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1019 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1020 } else if (exthdrs.ip6e_hbh) { 1021 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1022 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1023 } else { 1024 nextproto = ip6->ip6_nxt; 1025 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1026 } 1027 1028 /* 1029 * Loop through length of segment after first fragment, 1030 * make new header and copy data of each part and link onto 1031 * chain. 1032 */ 1033 m0 = m; 1034 for (off = hlen; off < tlen; off += len) { 1035 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1036 if (!m) { 1037 error = ENOBUFS; 1038 ip6stat.ip6s_odropped++; 1039 goto sendorfree; 1040 } 1041 m->m_pkthdr.rcvif = NULL; 1042 m->m_flags = m0->m_flags & M_COPYFLAGS; 1043 *mnext = m; 1044 mnext = &m->m_nextpkt; 1045 m->m_data += max_linkhdr; 1046 mhip6 = mtod(m, struct ip6_hdr *); 1047 *mhip6 = *ip6; 1048 m->m_len = sizeof(*mhip6); 1049 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1050 if (error) { 1051 ip6stat.ip6s_odropped++; 1052 goto sendorfree; 1053 } 1054 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1055 if (off + len >= tlen) 1056 len = tlen - off; 1057 else 1058 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1059 mhip6->ip6_plen = htons((u_short)(len + hlen + 1060 sizeof(*ip6f) - 1061 sizeof(struct ip6_hdr))); 1062 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1063 error = ENOBUFS; 1064 ip6stat.ip6s_odropped++; 1065 goto sendorfree; 1066 } 1067 m_cat(m, m_frgpart); 1068 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1069 m->m_pkthdr.rcvif = (struct ifnet *)0; 1070 ip6f->ip6f_reserved = 0; 1071 ip6f->ip6f_ident = id; 1072 ip6f->ip6f_nxt = nextproto; 1073 ip6stat.ip6s_ofragments++; 1074 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1075 } 1076 1077 in6_ifstat_inc(ifp, ifs6_out_fragok); 1078 } 1079 1080 /* 1081 * Remove leading garbages. 1082 */ 1083 sendorfree: 1084 m = m0->m_nextpkt; 1085 m0->m_nextpkt = NULL; 1086 m_freem(m0); 1087 for (m0 = m; m; m = m0) { 1088 m0 = m->m_nextpkt; 1089 m->m_nextpkt = NULL; 1090 if (error == 0) { 1091 /* Record statistics for this interface address. */ 1092 if (ia) { 1093 ia->ia_ifa.if_opackets++; 1094 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1095 } 1096 #ifdef IPSEC 1097 /* clean ipsec history once it goes out of the node */ 1098 ipsec_delaux(m); 1099 #endif 1100 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1101 } else 1102 m_freem(m); 1103 } 1104 1105 if (error == 0) 1106 ip6stat.ip6s_fragmented++; 1107 1108 done: 1109 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1110 RTFREE(ro->ro_rt); 1111 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1112 RTFREE(ro_pmtu->ro_rt); 1113 } 1114 1115 #ifdef IPSEC 1116 if (sp != NULL) 1117 key_freesp(sp); 1118 #endif 1119 #ifdef FAST_IPSEC 1120 if (sp != NULL) 1121 KEY_FREESP(&sp); 1122 #endif 1123 1124 return (error); 1125 1126 freehdrs: 1127 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1128 m_freem(exthdrs.ip6e_dest1); 1129 m_freem(exthdrs.ip6e_rthdr); 1130 m_freem(exthdrs.ip6e_dest2); 1131 /* fall through */ 1132 bad: 1133 m_freem(m); 1134 goto done; 1135 } 1136 1137 static int 1138 copyexthdr(void *h, struct mbuf **mp) 1139 { 1140 struct ip6_ext *hdr = h; 1141 int hlen; 1142 struct mbuf *m; 1143 1144 if (hdr == NULL) 1145 return 0; 1146 1147 hlen = (hdr->ip6e_len + 1) * 8; 1148 if (hlen > MCLBYTES) 1149 return ENOBUFS; /* XXX */ 1150 1151 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0); 1152 if (!m) 1153 return ENOBUFS; 1154 m->m_len = hlen; 1155 1156 bcopy(hdr, mtod(m, caddr_t), hlen); 1157 1158 *mp = m; 1159 return 0; 1160 } 1161 1162 /* 1163 * Insert jumbo payload option. 1164 */ 1165 static int 1166 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1167 { 1168 struct mbuf *mopt; 1169 u_char *optbuf; 1170 u_int32_t v; 1171 1172 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1173 1174 /* 1175 * If there is no hop-by-hop options header, allocate new one. 1176 * If there is one but it doesn't have enough space to store the 1177 * jumbo payload option, allocate a cluster to store the whole options. 1178 * Otherwise, use it to store the options. 1179 */ 1180 if (exthdrs->ip6e_hbh == NULL) { 1181 MGET(mopt, MB_DONTWAIT, MT_DATA); 1182 if (mopt == NULL) 1183 return (ENOBUFS); 1184 mopt->m_len = JUMBOOPTLEN; 1185 optbuf = mtod(mopt, u_char *); 1186 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1187 exthdrs->ip6e_hbh = mopt; 1188 } else { 1189 struct ip6_hbh *hbh; 1190 1191 mopt = exthdrs->ip6e_hbh; 1192 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1193 /* 1194 * XXX assumption: 1195 * - exthdrs->ip6e_hbh is not referenced from places 1196 * other than exthdrs. 1197 * - exthdrs->ip6e_hbh is not an mbuf chain. 1198 */ 1199 int oldoptlen = mopt->m_len; 1200 struct mbuf *n; 1201 1202 /* 1203 * XXX: give up if the whole (new) hbh header does 1204 * not fit even in an mbuf cluster. 1205 */ 1206 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1207 return (ENOBUFS); 1208 1209 /* 1210 * As a consequence, we must always prepare a cluster 1211 * at this point. 1212 */ 1213 n = m_getcl(MB_DONTWAIT, MT_DATA, 0); 1214 if (!n) 1215 return (ENOBUFS); 1216 n->m_len = oldoptlen + JUMBOOPTLEN; 1217 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1218 optbuf = mtod(n, caddr_t) + oldoptlen; 1219 m_freem(mopt); 1220 mopt = exthdrs->ip6e_hbh = n; 1221 } else { 1222 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1223 mopt->m_len += JUMBOOPTLEN; 1224 } 1225 optbuf[0] = IP6OPT_PADN; 1226 optbuf[1] = 1; 1227 1228 /* 1229 * Adjust the header length according to the pad and 1230 * the jumbo payload option. 1231 */ 1232 hbh = mtod(mopt, struct ip6_hbh *); 1233 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1234 } 1235 1236 /* fill in the option. */ 1237 optbuf[2] = IP6OPT_JUMBO; 1238 optbuf[3] = 4; 1239 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1240 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1241 1242 /* finally, adjust the packet header length */ 1243 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1244 1245 return (0); 1246 #undef JUMBOOPTLEN 1247 } 1248 1249 /* 1250 * Insert fragment header and copy unfragmentable header portions. 1251 */ 1252 static int 1253 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1254 struct ip6_frag **frghdrp) 1255 { 1256 struct mbuf *n, *mlast; 1257 1258 if (hlen > sizeof(struct ip6_hdr)) { 1259 n = m_copym(m0, sizeof(struct ip6_hdr), 1260 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1261 if (n == NULL) 1262 return (ENOBUFS); 1263 m->m_next = n; 1264 } else 1265 n = m; 1266 1267 /* Search for the last mbuf of unfragmentable part. */ 1268 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1269 ; 1270 1271 if (!(mlast->m_flags & M_EXT) && 1272 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1273 /* use the trailing space of the last mbuf for the fragment hdr */ 1274 *frghdrp = 1275 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1276 mlast->m_len += sizeof(struct ip6_frag); 1277 m->m_pkthdr.len += sizeof(struct ip6_frag); 1278 } else { 1279 /* allocate a new mbuf for the fragment header */ 1280 struct mbuf *mfrg; 1281 1282 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1283 if (mfrg == NULL) 1284 return (ENOBUFS); 1285 mfrg->m_len = sizeof(struct ip6_frag); 1286 *frghdrp = mtod(mfrg, struct ip6_frag *); 1287 mlast->m_next = mfrg; 1288 } 1289 1290 return (0); 1291 } 1292 1293 static int 1294 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1295 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1296 int *alwaysfragp) 1297 { 1298 u_int32_t mtu = 0; 1299 int alwaysfrag = 0; 1300 int error = 0; 1301 1302 if (ro_pmtu != ro) { 1303 /* The first hop and the final destination may differ. */ 1304 struct sockaddr_in6 *sa6_dst = 1305 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1306 if (ro_pmtu->ro_rt && 1307 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1308 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1309 RTFREE(ro_pmtu->ro_rt); 1310 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1311 } 1312 if (ro_pmtu->ro_rt == NULL) { 1313 bzero(sa6_dst, sizeof(*sa6_dst)); 1314 sa6_dst->sin6_family = AF_INET6; 1315 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1316 sa6_dst->sin6_addr = *dst; 1317 1318 rtalloc((struct route *)ro_pmtu); 1319 } 1320 } 1321 if (ro_pmtu->ro_rt) { 1322 u_int32_t ifmtu; 1323 struct in_conninfo inc; 1324 1325 bzero(&inc, sizeof(inc)); 1326 inc.inc_flags = 1; /* IPv6 */ 1327 inc.inc6_faddr = *dst; 1328 1329 if (ifp == NULL) 1330 ifp = ro_pmtu->ro_rt->rt_ifp; 1331 ifmtu = IN6_LINKMTU(ifp); 1332 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1333 if (mtu == 0) 1334 mtu = ifmtu; 1335 else if (mtu < IPV6_MMTU) { 1336 /* 1337 * RFC2460 section 5, last paragraph: 1338 * if we record ICMPv6 too big message with 1339 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1340 * or smaller, with framgent header attached. 1341 * (fragment header is needed regardless from the 1342 * packet size, for translators to identify packets) 1343 */ 1344 alwaysfrag = 1; 1345 mtu = IPV6_MMTU; 1346 } else if (mtu > ifmtu) { 1347 /* 1348 * The MTU on the route is larger than the MTU on 1349 * the interface! This shouldn't happen, unless the 1350 * MTU of the interface has been changed after the 1351 * interface was brought up. Change the MTU in the 1352 * route to match the interface MTU (as long as the 1353 * field isn't locked). 1354 */ 1355 mtu = ifmtu; 1356 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1357 } 1358 } else if (ifp) { 1359 mtu = IN6_LINKMTU(ifp); 1360 } else 1361 error = EHOSTUNREACH; /* XXX */ 1362 1363 *mtup = mtu; 1364 if (alwaysfragp) 1365 *alwaysfragp = alwaysfrag; 1366 return (error); 1367 } 1368 1369 /* 1370 * IP6 socket option processing. 1371 */ 1372 int 1373 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1374 { 1375 int optdatalen,uproto; 1376 int privileged; 1377 struct inpcb *in6p = so->so_pcb; 1378 void *optdata; 1379 int error, optval; 1380 int level, op, optname; 1381 int optlen; 1382 struct thread *td; 1383 1384 if (sopt) { 1385 level = sopt->sopt_level; 1386 op = sopt->sopt_dir; 1387 optname = sopt->sopt_name; 1388 optlen = sopt->sopt_valsize; 1389 td = sopt->sopt_td; 1390 } else { 1391 panic("ip6_ctloutput: arg soopt is NULL"); 1392 /* NOT REACHED */ 1393 td = NULL; 1394 } 1395 error = optval = 0; 1396 1397 uproto = (int)so->so_proto->pr_protocol; 1398 privileged = (td == NULL || suser(td)) ? 0 : 1; 1399 1400 if (level == IPPROTO_IPV6) { 1401 switch (op) { 1402 1403 case SOPT_SET: 1404 switch (optname) { 1405 case IPV6_2292PKTOPTIONS: 1406 #ifdef IPV6_PKTOPTIONS 1407 case IPV6_PKTOPTIONS: 1408 #endif 1409 { 1410 struct mbuf *m; 1411 1412 error = soopt_getm(sopt, &m); /* XXX */ 1413 if (error != 0) 1414 break; 1415 soopt_to_mbuf(sopt, m); /* XXX */ 1416 error = ip6_pcbopts(&in6p->in6p_outputopts, 1417 m, so, sopt); 1418 m_freem(m); /* XXX */ 1419 break; 1420 } 1421 1422 /* 1423 * Use of some Hop-by-Hop options or some 1424 * Destination options, might require special 1425 * privilege. That is, normal applications 1426 * (without special privilege) might be forbidden 1427 * from setting certain options in outgoing packets, 1428 * and might never see certain options in received 1429 * packets. [RFC 2292 Section 6] 1430 * KAME specific note: 1431 * KAME prevents non-privileged users from sending or 1432 * receiving ANY hbh/dst options in order to avoid 1433 * overhead of parsing options in the kernel. 1434 */ 1435 case IPV6_RECVHOPOPTS: 1436 case IPV6_RECVDSTOPTS: 1437 case IPV6_RECVRTHDRDSTOPTS: 1438 if (!privileged) 1439 return (EPERM); 1440 case IPV6_RECVPKTINFO: 1441 case IPV6_RECVHOPLIMIT: 1442 case IPV6_RECVRTHDR: 1443 case IPV6_RECVPATHMTU: 1444 case IPV6_RECVTCLASS: 1445 case IPV6_AUTOFLOWLABEL: 1446 case IPV6_HOPLIMIT: 1447 /* FALLTHROUGH */ 1448 case IPV6_UNICAST_HOPS: 1449 case IPV6_FAITH: 1450 1451 case IPV6_V6ONLY: 1452 if (optlen != sizeof(int)) { 1453 error = EINVAL; 1454 break; 1455 } 1456 error = soopt_to_kbuf(sopt, &optval, 1457 sizeof optval, sizeof optval); 1458 if (error) 1459 break; 1460 switch (optname) { 1461 1462 case IPV6_UNICAST_HOPS: 1463 if (optval < -1 || optval >= 256) 1464 error = EINVAL; 1465 else { 1466 /* -1 = kernel default */ 1467 in6p->in6p_hops = optval; 1468 1469 if ((in6p->in6p_vflag & 1470 INP_IPV4) != 0) 1471 in6p->inp_ip_ttl = optval; 1472 } 1473 break; 1474 #define OPTSET(bit) \ 1475 do { \ 1476 if (optval) \ 1477 in6p->in6p_flags |= (bit); \ 1478 else \ 1479 in6p->in6p_flags &= ~(bit); \ 1480 } while (0) 1481 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1482 /* 1483 * Although changed to RFC3542, It's better to also support RFC2292 API 1484 */ 1485 #define OPTSET2292(bit) \ 1486 do { \ 1487 in6p->in6p_flags |= IN6P_RFC2292; \ 1488 if (optval) \ 1489 in6p->in6p_flags |= (bit); \ 1490 else \ 1491 in6p->in6p_flags &= ~(bit); \ 1492 } while (/*CONSTCOND*/ 0) 1493 1494 case IPV6_RECVPKTINFO: 1495 /* cannot mix with RFC2292 */ 1496 if (OPTBIT(IN6P_RFC2292)) { 1497 error = EINVAL; 1498 break; 1499 } 1500 OPTSET(IN6P_PKTINFO); 1501 break; 1502 1503 case IPV6_HOPLIMIT: 1504 { 1505 struct ip6_pktopts **optp; 1506 1507 /* cannot mix with RFC2292 */ 1508 if (OPTBIT(IN6P_RFC2292)) { 1509 error = EINVAL; 1510 break; 1511 } 1512 optp = &in6p->in6p_outputopts; 1513 error = ip6_pcbopt(IPV6_HOPLIMIT, 1514 (u_char *)&optval, sizeof(optval), 1515 optp, uproto); 1516 break; 1517 } 1518 1519 case IPV6_RECVHOPLIMIT: 1520 /* cannot mix with RFC2292 */ 1521 if (OPTBIT(IN6P_RFC2292)) { 1522 error = EINVAL; 1523 break; 1524 } 1525 OPTSET(IN6P_HOPLIMIT); 1526 break; 1527 1528 case IPV6_RECVHOPOPTS: 1529 /* cannot mix with RFC2292 */ 1530 if (OPTBIT(IN6P_RFC2292)) { 1531 error = EINVAL; 1532 break; 1533 } 1534 OPTSET(IN6P_HOPOPTS); 1535 break; 1536 1537 case IPV6_RECVDSTOPTS: 1538 /* cannot mix with RFC2292 */ 1539 if (OPTBIT(IN6P_RFC2292)) { 1540 error = EINVAL; 1541 break; 1542 } 1543 OPTSET(IN6P_DSTOPTS); 1544 break; 1545 1546 case IPV6_RECVRTHDRDSTOPTS: 1547 /* cannot mix with RFC2292 */ 1548 if (OPTBIT(IN6P_RFC2292)) { 1549 error = EINVAL; 1550 break; 1551 } 1552 OPTSET(IN6P_RTHDRDSTOPTS); 1553 break; 1554 1555 case IPV6_RECVRTHDR: 1556 /* cannot mix with RFC2292 */ 1557 if (OPTBIT(IN6P_RFC2292)) { 1558 error = EINVAL; 1559 break; 1560 } 1561 OPTSET(IN6P_RTHDR); 1562 break; 1563 1564 case IPV6_RECVPATHMTU: 1565 /* 1566 * We ignore this option for TCP 1567 * sockets. 1568 * (RFC3542 leaves this case 1569 * unspecified.) 1570 */ 1571 if (uproto != IPPROTO_TCP) 1572 OPTSET(IN6P_MTU); 1573 break; 1574 1575 case IPV6_RECVTCLASS: 1576 /* cannot mix with RFC2292 XXX */ 1577 if (OPTBIT(IN6P_RFC2292)) { 1578 error = EINVAL; 1579 break; 1580 } 1581 OPTSET(IN6P_TCLASS); 1582 break; 1583 1584 case IPV6_AUTOFLOWLABEL: 1585 OPTSET(IN6P_AUTOFLOWLABEL); 1586 break; 1587 1588 case IPV6_FAITH: 1589 OPTSET(IN6P_FAITH); 1590 break; 1591 1592 case IPV6_V6ONLY: 1593 /* 1594 * make setsockopt(IPV6_V6ONLY) 1595 * available only prior to bind(2). 1596 */ 1597 if (in6p->in6p_lport || 1598 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1599 { 1600 error = EINVAL; 1601 break; 1602 } 1603 OPTSET(IN6P_IPV6_V6ONLY); 1604 if (optval) 1605 in6p->in6p_vflag &= ~INP_IPV4; 1606 else 1607 in6p->in6p_vflag |= INP_IPV4; 1608 break; 1609 } 1610 break; 1611 1612 case IPV6_TCLASS: 1613 case IPV6_DONTFRAG: 1614 case IPV6_USE_MIN_MTU: 1615 case IPV6_PREFER_TEMPADDR: 1616 if (optlen != sizeof(optval)) { 1617 error = EINVAL; 1618 break; 1619 } 1620 error = soopt_to_kbuf(sopt, &optval, 1621 sizeof optval, sizeof optval); 1622 if (error) 1623 break; 1624 { 1625 struct ip6_pktopts **optp; 1626 optp = &in6p->in6p_outputopts; 1627 error = ip6_pcbopt(optname, 1628 (u_char *)&optval, sizeof(optval), 1629 optp, uproto); 1630 break; 1631 } 1632 1633 case IPV6_2292PKTINFO: 1634 case IPV6_2292HOPLIMIT: 1635 case IPV6_2292HOPOPTS: 1636 case IPV6_2292DSTOPTS: 1637 case IPV6_2292RTHDR: 1638 /* RFC 2292 */ 1639 if (optlen != sizeof(int)) { 1640 error = EINVAL; 1641 break; 1642 } 1643 error = soopt_to_kbuf(sopt, &optval, 1644 sizeof optval, sizeof optval); 1645 if (error) 1646 break; 1647 switch (optname) { 1648 case IPV6_2292PKTINFO: 1649 OPTSET2292(IN6P_PKTINFO); 1650 break; 1651 case IPV6_2292HOPLIMIT: 1652 OPTSET2292(IN6P_HOPLIMIT); 1653 break; 1654 case IPV6_2292HOPOPTS: 1655 /* 1656 * Check super-user privilege. 1657 * See comments for IPV6_RECVHOPOPTS. 1658 */ 1659 if (!privileged) 1660 return (EPERM); 1661 OPTSET2292(IN6P_HOPOPTS); 1662 break; 1663 case IPV6_2292DSTOPTS: 1664 if (!privileged) 1665 return (EPERM); 1666 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1667 break; 1668 case IPV6_2292RTHDR: 1669 OPTSET2292(IN6P_RTHDR); 1670 break; 1671 } 1672 break; 1673 1674 case IPV6_PKTINFO: 1675 case IPV6_HOPOPTS: 1676 case IPV6_RTHDR: 1677 case IPV6_DSTOPTS: 1678 case IPV6_RTHDRDSTOPTS: 1679 case IPV6_NEXTHOP: 1680 { 1681 /* 1682 * New advanced API (RFC3542) 1683 */ 1684 u_char *optbuf; 1685 u_char optbuf_storage[MCLBYTES]; 1686 int optlen; 1687 struct ip6_pktopts **optp; 1688 1689 /* cannot mix with RFC2292 */ 1690 if (OPTBIT(IN6P_RFC2292)) { 1691 error = EINVAL; 1692 break; 1693 } 1694 1695 /* 1696 * We only ensure valsize is not too large 1697 * here. Further validation will be done 1698 * later. 1699 */ 1700 error = soopt_to_kbuf(sopt, optbuf_storage, 1701 sizeof(optbuf_storage), 0); 1702 if (error) 1703 break; 1704 optlen = sopt->sopt_valsize; 1705 optbuf = optbuf_storage; 1706 optp = &in6p->in6p_outputopts; 1707 error = ip6_pcbopt(optname, optbuf, optlen, 1708 optp, uproto); 1709 break; 1710 } 1711 #undef OPTSET 1712 1713 case IPV6_MULTICAST_IF: 1714 case IPV6_MULTICAST_HOPS: 1715 case IPV6_MULTICAST_LOOP: 1716 case IPV6_JOIN_GROUP: 1717 case IPV6_LEAVE_GROUP: 1718 { 1719 struct mbuf *m; 1720 if (sopt->sopt_valsize > MLEN) { 1721 error = EMSGSIZE; 1722 break; 1723 } 1724 /* XXX */ 1725 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1726 if (m == NULL) { 1727 error = ENOBUFS; 1728 break; 1729 } 1730 m->m_len = sopt->sopt_valsize; 1731 error = soopt_to_kbuf(sopt, mtod(m, char *), 1732 m->m_len, m->m_len); 1733 error = ip6_setmoptions(sopt->sopt_name, 1734 &in6p->in6p_moptions, 1735 m); 1736 m_free(m); 1737 } 1738 break; 1739 1740 case IPV6_PORTRANGE: 1741 error = soopt_to_kbuf(sopt, &optval, 1742 sizeof optval, sizeof optval); 1743 if (error) 1744 break; 1745 1746 switch (optval) { 1747 case IPV6_PORTRANGE_DEFAULT: 1748 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1749 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1750 break; 1751 1752 case IPV6_PORTRANGE_HIGH: 1753 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1754 in6p->in6p_flags |= IN6P_HIGHPORT; 1755 break; 1756 1757 case IPV6_PORTRANGE_LOW: 1758 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1759 in6p->in6p_flags |= IN6P_LOWPORT; 1760 break; 1761 1762 default: 1763 error = EINVAL; 1764 break; 1765 } 1766 break; 1767 1768 #if defined(IPSEC) || defined(FAST_IPSEC) 1769 case IPV6_IPSEC_POLICY: 1770 { 1771 caddr_t req = NULL; 1772 size_t len = 0; 1773 struct mbuf *m; 1774 1775 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1776 break; 1777 soopt_to_mbuf(sopt, m); /* XXX */ 1778 if (m) { 1779 req = mtod(m, caddr_t); 1780 len = m->m_len; 1781 } 1782 error = ipsec6_set_policy(in6p, optname, req, 1783 len, privileged); 1784 m_freem(m); 1785 } 1786 break; 1787 #endif /* KAME IPSEC */ 1788 1789 case IPV6_FW_ADD: 1790 case IPV6_FW_DEL: 1791 case IPV6_FW_FLUSH: 1792 case IPV6_FW_ZERO: 1793 { 1794 struct mbuf *m; 1795 struct mbuf **mp = &m; 1796 1797 if (ip6_fw_ctl_ptr == NULL) 1798 return EINVAL; 1799 /* XXX */ 1800 if ((error = soopt_getm(sopt, &m)) != 0) 1801 break; 1802 /* XXX */ 1803 soopt_to_mbuf(sopt, m); 1804 error = (*ip6_fw_ctl_ptr)(optname, mp); 1805 m = *mp; 1806 } 1807 break; 1808 1809 default: 1810 error = ENOPROTOOPT; 1811 break; 1812 } 1813 break; 1814 1815 case SOPT_GET: 1816 switch (optname) { 1817 case IPV6_2292PKTOPTIONS: 1818 #ifdef IPV6_PKTOPTIONS 1819 case IPV6_PKTOPTIONS: 1820 #endif 1821 /* 1822 * RFC3542 (effectively) deprecated the 1823 * semantics of the 2292-style pktoptions. 1824 * Since it was not reliable in nature (i.e., 1825 * applications had to expect the lack of some 1826 * information after all), it would make sense 1827 * to simplify this part by always returning 1828 * empty data. 1829 */ 1830 if (in6p->in6p_options) { 1831 struct mbuf *m; 1832 m = m_copym(in6p->in6p_options, 1833 0, M_COPYALL, MB_WAIT); 1834 error = soopt_from_mbuf(sopt, m); 1835 if (error == 0) 1836 m_freem(m); 1837 } else 1838 sopt->sopt_valsize = 0; 1839 break; 1840 1841 case IPV6_RECVHOPOPTS: 1842 case IPV6_RECVDSTOPTS: 1843 case IPV6_RECVRTHDRDSTOPTS: 1844 case IPV6_UNICAST_HOPS: 1845 case IPV6_RECVPKTINFO: 1846 case IPV6_RECVHOPLIMIT: 1847 case IPV6_RECVRTHDR: 1848 case IPV6_RECVPATHMTU: 1849 case IPV6_RECVTCLASS: 1850 case IPV6_AUTOFLOWLABEL: 1851 case IPV6_FAITH: 1852 case IPV6_V6ONLY: 1853 case IPV6_PORTRANGE: 1854 switch (optname) { 1855 1856 case IPV6_RECVHOPOPTS: 1857 optval = OPTBIT(IN6P_HOPOPTS); 1858 break; 1859 1860 case IPV6_RECVDSTOPTS: 1861 optval = OPTBIT(IN6P_DSTOPTS); 1862 break; 1863 1864 case IPV6_RECVRTHDRDSTOPTS: 1865 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1866 break; 1867 1868 case IPV6_RECVPKTINFO: 1869 optval = OPTBIT(IN6P_PKTINFO); 1870 break; 1871 1872 case IPV6_RECVHOPLIMIT: 1873 optval = OPTBIT(IN6P_HOPLIMIT); 1874 break; 1875 1876 case IPV6_RECVRTHDR: 1877 optval = OPTBIT(IN6P_RTHDR); 1878 break; 1879 1880 case IPV6_RECVPATHMTU: 1881 optval = OPTBIT(IN6P_MTU); 1882 break; 1883 1884 case IPV6_RECVTCLASS: 1885 optval = OPTBIT(IN6P_TCLASS); 1886 break; 1887 1888 case IPV6_AUTOFLOWLABEL: 1889 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1890 break; 1891 1892 1893 case IPV6_UNICAST_HOPS: 1894 optval = in6p->in6p_hops; 1895 break; 1896 1897 case IPV6_FAITH: 1898 optval = OPTBIT(IN6P_FAITH); 1899 break; 1900 1901 case IPV6_V6ONLY: 1902 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1903 break; 1904 1905 case IPV6_PORTRANGE: 1906 { 1907 int flags; 1908 flags = in6p->in6p_flags; 1909 if (flags & IN6P_HIGHPORT) 1910 optval = IPV6_PORTRANGE_HIGH; 1911 else if (flags & IN6P_LOWPORT) 1912 optval = IPV6_PORTRANGE_LOW; 1913 else 1914 optval = 0; 1915 break; 1916 } 1917 } 1918 soopt_from_kbuf(sopt, &optval, 1919 sizeof optval); 1920 break; 1921 1922 case IPV6_PATHMTU: 1923 { 1924 u_long pmtu = 0; 1925 struct ip6_mtuinfo mtuinfo; 1926 struct route_in6 sro; 1927 1928 bzero(&sro, sizeof(sro)); 1929 1930 if (!(so->so_state & SS_ISCONNECTED)) 1931 return (ENOTCONN); 1932 /* 1933 * XXX: we dot not consider the case of source 1934 * routing, or optional information to specify 1935 * the outgoing interface. 1936 */ 1937 error = ip6_getpmtu(&sro, NULL, NULL, 1938 &in6p->in6p_faddr, &pmtu, NULL); 1939 if (sro.ro_rt) 1940 RTFREE(sro.ro_rt); 1941 if (error) 1942 break; 1943 if (pmtu > IPV6_MAXPACKET) 1944 pmtu = IPV6_MAXPACKET; 1945 1946 bzero(&mtuinfo, sizeof(mtuinfo)); 1947 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1948 optdata = (void *)&mtuinfo; 1949 optdatalen = sizeof(mtuinfo); 1950 soopt_from_kbuf(sopt, optdata, 1951 optdatalen); 1952 break; 1953 } 1954 1955 case IPV6_2292PKTINFO: 1956 case IPV6_2292HOPLIMIT: 1957 case IPV6_2292HOPOPTS: 1958 case IPV6_2292RTHDR: 1959 case IPV6_2292DSTOPTS: 1960 if (optname == IPV6_2292HOPOPTS || 1961 optname == IPV6_2292DSTOPTS || 1962 !privileged) 1963 return (EPERM); 1964 switch (optname) { 1965 case IPV6_2292PKTINFO: 1966 optval = OPTBIT(IN6P_PKTINFO); 1967 break; 1968 case IPV6_2292HOPLIMIT: 1969 optval = OPTBIT(IN6P_HOPLIMIT); 1970 break; 1971 case IPV6_2292HOPOPTS: 1972 if (!privileged) 1973 return (EPERM); 1974 optval = OPTBIT(IN6P_HOPOPTS); 1975 break; 1976 case IPV6_2292RTHDR: 1977 optval = OPTBIT(IN6P_RTHDR); 1978 break; 1979 case IPV6_2292DSTOPTS: 1980 if (!privileged) 1981 return (EPERM); 1982 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1983 break; 1984 } 1985 soopt_from_kbuf(sopt, &optval, 1986 sizeof optval); 1987 break; 1988 1989 case IPV6_PKTINFO: 1990 case IPV6_HOPOPTS: 1991 case IPV6_RTHDR: 1992 case IPV6_DSTOPTS: 1993 case IPV6_RTHDRDSTOPTS: 1994 case IPV6_NEXTHOP: 1995 case IPV6_TCLASS: 1996 case IPV6_DONTFRAG: 1997 case IPV6_USE_MIN_MTU: 1998 case IPV6_PREFER_TEMPADDR: 1999 error = ip6_getpcbopt(in6p->in6p_outputopts, 2000 optname, sopt); 2001 break; 2002 2003 case IPV6_MULTICAST_IF: 2004 case IPV6_MULTICAST_HOPS: 2005 case IPV6_MULTICAST_LOOP: 2006 case IPV6_JOIN_GROUP: 2007 case IPV6_LEAVE_GROUP: 2008 { 2009 struct mbuf *m; 2010 error = ip6_getmoptions(sopt->sopt_name, 2011 in6p->in6p_moptions, &m); 2012 if (error == 0) 2013 soopt_from_kbuf(sopt, 2014 mtod(m, char *), m->m_len); 2015 m_freem(m); 2016 } 2017 break; 2018 2019 #if defined(IPSEC) || defined(FAST_IPSEC) 2020 case IPV6_IPSEC_POLICY: 2021 { 2022 caddr_t req = NULL; 2023 size_t len = 0; 2024 struct mbuf *m = NULL; 2025 struct mbuf **mp = &m; 2026 2027 error = soopt_getm(sopt, &m); /* XXX */ 2028 if (error != 0) 2029 break; 2030 soopt_to_mbuf(sopt, m); /* XXX */ 2031 if (m) { 2032 req = mtod(m, caddr_t); 2033 len = m->m_len; 2034 } 2035 error = ipsec6_get_policy(in6p, req, len, mp); 2036 if (error == 0) 2037 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2038 if (error == 0 && m != NULL) 2039 m_freem(m); 2040 break; 2041 } 2042 #endif /* KAME IPSEC */ 2043 2044 case IPV6_FW_GET: 2045 { 2046 struct mbuf *m; 2047 struct mbuf **mp = &m; 2048 2049 if (ip6_fw_ctl_ptr == NULL) 2050 { 2051 return EINVAL; 2052 } 2053 error = (*ip6_fw_ctl_ptr)(optname, mp); 2054 if (error == 0) 2055 error = soopt_from_mbuf(sopt, m); /* XXX */ 2056 if (error == 0 && m != NULL) 2057 m_freem(m); 2058 } 2059 break; 2060 2061 default: 2062 error = ENOPROTOOPT; 2063 break; 2064 } 2065 break; 2066 } 2067 } else { 2068 error = EINVAL; 2069 } 2070 return (error); 2071 } 2072 2073 int 2074 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2075 { 2076 int error = 0, optval, optlen; 2077 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2078 struct in6pcb *in6p = sotoin6pcb(so); 2079 int level, op, optname; 2080 2081 if (sopt) { 2082 level = sopt->sopt_level; 2083 op = sopt->sopt_dir; 2084 optname = sopt->sopt_name; 2085 optlen = sopt->sopt_valsize; 2086 } else 2087 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2088 2089 if (level != IPPROTO_IPV6) { 2090 return (EINVAL); 2091 } 2092 2093 switch (optname) { 2094 case IPV6_CHECKSUM: 2095 /* 2096 * For ICMPv6 sockets, no modification allowed for checksum 2097 * offset, permit "no change" values to help existing apps. 2098 * 2099 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2100 * for an ICMPv6 socket will fail." 2101 * The current behavior does not meet RFC3542. 2102 */ 2103 switch (op) { 2104 case SOPT_SET: 2105 if (optlen != sizeof(int)) { 2106 error = EINVAL; 2107 break; 2108 } 2109 error = soopt_to_kbuf(sopt, &optval, 2110 sizeof optval, sizeof optval); 2111 if (error) 2112 break; 2113 if ((optval % 2) != 0) { 2114 /* the API assumes even offset values */ 2115 error = EINVAL; 2116 } else if (so->so_proto->pr_protocol == 2117 IPPROTO_ICMPV6) { 2118 if (optval != icmp6off) 2119 error = EINVAL; 2120 } else 2121 in6p->in6p_cksum = optval; 2122 break; 2123 2124 case SOPT_GET: 2125 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2126 optval = icmp6off; 2127 else 2128 optval = in6p->in6p_cksum; 2129 2130 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2131 break; 2132 2133 default: 2134 error = EINVAL; 2135 break; 2136 } 2137 break; 2138 2139 default: 2140 error = ENOPROTOOPT; 2141 break; 2142 } 2143 2144 return (error); 2145 } 2146 2147 /* 2148 * Set up IP6 options in pcb for insertion in output packets or 2149 * specifying behavior of outgoing packets. 2150 */ 2151 static int 2152 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2153 struct socket *so, struct sockopt *sopt) 2154 { 2155 int priv = 0; 2156 struct ip6_pktopts *opt = *pktopt; 2157 int error = 0; 2158 2159 /* turn off any old options. */ 2160 if (opt) { 2161 #ifdef DIAGNOSTIC 2162 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2163 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2164 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2165 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2166 #endif 2167 ip6_clearpktopts(opt, -1); 2168 } else 2169 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2170 *pktopt = NULL; 2171 2172 if (!m || m->m_len == 0) { 2173 /* 2174 * Only turning off any previous options, regardless of 2175 * whether the opt is just created or given. 2176 */ 2177 kfree(opt, M_IP6OPT); 2178 return (0); 2179 } 2180 2181 /* set options specified by user. */ 2182 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2183 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2184 kfree(opt, M_IP6OPT); 2185 return (error); 2186 } 2187 *pktopt = opt; 2188 return (0); 2189 } 2190 2191 2192 /* 2193 * Below three functions are introduced by merge to RFC3542 2194 */ 2195 2196 static int 2197 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2198 { 2199 void *optdata = NULL; 2200 int optdatalen = 0; 2201 struct ip6_ext *ip6e; 2202 int error = 0; 2203 struct in6_pktinfo null_pktinfo; 2204 int deftclass = 0, on; 2205 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2206 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2207 2208 switch (optname) { 2209 case IPV6_PKTINFO: 2210 if (pktopt && pktopt->ip6po_pktinfo) 2211 optdata = (void *)pktopt->ip6po_pktinfo; 2212 else { 2213 /* XXX: we don't have to do this every time... */ 2214 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2215 optdata = (void *)&null_pktinfo; 2216 } 2217 optdatalen = sizeof(struct in6_pktinfo); 2218 break; 2219 case IPV6_TCLASS: 2220 if (pktopt && pktopt->ip6po_tclass >= 0) 2221 optdata = (void *)&pktopt->ip6po_tclass; 2222 else 2223 optdata = (void *)&deftclass; 2224 optdatalen = sizeof(int); 2225 break; 2226 case IPV6_HOPOPTS: 2227 if (pktopt && pktopt->ip6po_hbh) { 2228 optdata = (void *)pktopt->ip6po_hbh; 2229 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2230 optdatalen = (ip6e->ip6e_len + 1) << 3; 2231 } 2232 break; 2233 case IPV6_RTHDR: 2234 if (pktopt && pktopt->ip6po_rthdr) { 2235 optdata = (void *)pktopt->ip6po_rthdr; 2236 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2237 optdatalen = (ip6e->ip6e_len + 1) << 3; 2238 } 2239 break; 2240 case IPV6_RTHDRDSTOPTS: 2241 if (pktopt && pktopt->ip6po_dest1) { 2242 optdata = (void *)pktopt->ip6po_dest1; 2243 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2244 optdatalen = (ip6e->ip6e_len + 1) << 3; 2245 } 2246 break; 2247 case IPV6_DSTOPTS: 2248 if (pktopt && pktopt->ip6po_dest2) { 2249 optdata = (void *)pktopt->ip6po_dest2; 2250 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2251 optdatalen = (ip6e->ip6e_len + 1) << 3; 2252 } 2253 break; 2254 case IPV6_NEXTHOP: 2255 if (pktopt && pktopt->ip6po_nexthop) { 2256 optdata = (void *)pktopt->ip6po_nexthop; 2257 optdatalen = pktopt->ip6po_nexthop->sa_len; 2258 } 2259 break; 2260 case IPV6_USE_MIN_MTU: 2261 if (pktopt) 2262 optdata = (void *)&pktopt->ip6po_minmtu; 2263 else 2264 optdata = (void *)&defminmtu; 2265 optdatalen = sizeof(int); 2266 break; 2267 case IPV6_DONTFRAG: 2268 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2269 on = 1; 2270 else 2271 on = 0; 2272 optdata = (void *)&on; 2273 optdatalen = sizeof(on); 2274 break; 2275 case IPV6_PREFER_TEMPADDR: 2276 if (pktopt) 2277 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2278 else 2279 optdata = (void *)&defpreftemp; 2280 optdatalen = sizeof(int); 2281 break; 2282 default: /* should not happen */ 2283 #ifdef DIAGNOSTIC 2284 panic("ip6_getpcbopt: unexpected option\n"); 2285 #endif 2286 return (ENOPROTOOPT); 2287 } 2288 2289 soopt_from_kbuf(sopt, optdata, optdatalen); 2290 2291 return (error); 2292 } 2293 2294 /* 2295 * initialize ip6_pktopts. beware that there are non-zero default values in 2296 * the struct. 2297 */ 2298 2299 static int 2300 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2301 { 2302 struct ip6_pktopts *opt; 2303 int priv =0; 2304 if (*pktopt == NULL) { 2305 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2306 init_ip6pktopts(*pktopt); 2307 } 2308 opt = *pktopt; 2309 2310 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2311 } 2312 2313 /* 2314 * initialize ip6_pktopts. beware that there are non-zero default values in 2315 * the struct. 2316 */ 2317 void 2318 init_ip6pktopts(struct ip6_pktopts *opt) 2319 { 2320 2321 bzero(opt, sizeof(*opt)); 2322 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2323 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2324 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2325 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2326 } 2327 2328 void 2329 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2330 { 2331 if (pktopt == NULL) 2332 return; 2333 2334 if (optname == -1 || optname == IPV6_PKTINFO) { 2335 if (pktopt->ip6po_pktinfo) 2336 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2337 pktopt->ip6po_pktinfo = NULL; 2338 } 2339 if (optname == -1 || optname == IPV6_HOPLIMIT) 2340 pktopt->ip6po_hlim = -1; 2341 if (optname == -1 || optname == IPV6_TCLASS) 2342 pktopt->ip6po_tclass = -1; 2343 if (optname == -1 || optname == IPV6_NEXTHOP) { 2344 if (pktopt->ip6po_nextroute.ro_rt) { 2345 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2346 pktopt->ip6po_nextroute.ro_rt = NULL; 2347 } 2348 if (pktopt->ip6po_nexthop) 2349 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2350 pktopt->ip6po_nexthop = NULL; 2351 } 2352 if (optname == -1 || optname == IPV6_HOPOPTS) { 2353 if (pktopt->ip6po_hbh) 2354 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2355 pktopt->ip6po_hbh = NULL; 2356 } 2357 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2358 if (pktopt->ip6po_dest1) 2359 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2360 pktopt->ip6po_dest1 = NULL; 2361 } 2362 if (optname == -1 || optname == IPV6_RTHDR) { 2363 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2364 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2365 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2366 if (pktopt->ip6po_route.ro_rt) { 2367 RTFREE(pktopt->ip6po_route.ro_rt); 2368 pktopt->ip6po_route.ro_rt = NULL; 2369 } 2370 } 2371 if (optname == -1 || optname == IPV6_DSTOPTS) { 2372 if (pktopt->ip6po_dest2) 2373 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2374 pktopt->ip6po_dest2 = NULL; 2375 } 2376 } 2377 2378 #define PKTOPT_EXTHDRCPY(type) \ 2379 do {\ 2380 if (src->type) {\ 2381 int hlen =\ 2382 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2383 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2384 if (dst->type == NULL)\ 2385 goto bad;\ 2386 bcopy(src->type, dst->type, hlen);\ 2387 }\ 2388 } while (0) 2389 2390 struct ip6_pktopts * 2391 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2392 { 2393 struct ip6_pktopts *dst; 2394 2395 if (src == NULL) { 2396 kprintf("ip6_clearpktopts: invalid argument\n"); 2397 return (NULL); 2398 } 2399 2400 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2401 if (dst == NULL) 2402 return (NULL); 2403 2404 dst->ip6po_hlim = src->ip6po_hlim; 2405 if (src->ip6po_pktinfo) { 2406 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2407 M_IP6OPT, canwait); 2408 if (dst->ip6po_pktinfo == NULL) 2409 goto bad; 2410 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2411 } 2412 if (src->ip6po_nexthop) { 2413 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2414 M_IP6OPT, canwait); 2415 if (dst->ip6po_nexthop == NULL) 2416 goto bad; 2417 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2418 src->ip6po_nexthop->sa_len); 2419 } 2420 PKTOPT_EXTHDRCPY(ip6po_hbh); 2421 PKTOPT_EXTHDRCPY(ip6po_dest1); 2422 PKTOPT_EXTHDRCPY(ip6po_dest2); 2423 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2424 return (dst); 2425 2426 bad: 2427 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2428 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2429 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2430 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2431 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2432 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2433 kfree(dst, M_IP6OPT); 2434 return (NULL); 2435 } 2436 2437 static int 2438 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2439 { 2440 if (dst == NULL || src == NULL) { 2441 #ifdef DIAGNOSTIC 2442 kprintf("ip6_clearpktopts: invalid argument\n"); 2443 #endif 2444 return (EINVAL); 2445 } 2446 2447 dst->ip6po_hlim = src->ip6po_hlim; 2448 dst->ip6po_tclass = src->ip6po_tclass; 2449 dst->ip6po_flags = src->ip6po_flags; 2450 if (src->ip6po_pktinfo) { 2451 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2452 M_IP6OPT, canwait); 2453 if (dst->ip6po_pktinfo == NULL) 2454 goto bad; 2455 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2456 } 2457 if (src->ip6po_nexthop) { 2458 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2459 M_IP6OPT, canwait); 2460 if (dst->ip6po_nexthop == NULL) 2461 goto bad; 2462 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2463 src->ip6po_nexthop->sa_len); 2464 } 2465 PKTOPT_EXTHDRCPY(ip6po_hbh); 2466 PKTOPT_EXTHDRCPY(ip6po_dest1); 2467 PKTOPT_EXTHDRCPY(ip6po_dest2); 2468 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2469 return (0); 2470 2471 bad: 2472 ip6_clearpktopts(dst, -1); 2473 return (ENOBUFS); 2474 } 2475 #undef PKTOPT_EXTHDRCPY 2476 2477 void 2478 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2479 { 2480 if (pktopt == NULL) 2481 return; 2482 2483 ip6_clearpktopts(pktopt, -1); 2484 2485 kfree(pktopt, M_IP6OPT); 2486 } 2487 2488 /* 2489 * Set the IP6 multicast options in response to user setsockopt(). 2490 */ 2491 static int 2492 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2493 { 2494 int error = 0; 2495 u_int loop, ifindex; 2496 struct ipv6_mreq *mreq; 2497 struct ifnet *ifp; 2498 struct ip6_moptions *im6o = *im6op; 2499 struct route_in6 ro; 2500 struct sockaddr_in6 *dst; 2501 struct in6_multi_mship *imm; 2502 struct thread *td = curthread; /* XXX */ 2503 2504 if (im6o == NULL) { 2505 /* 2506 * No multicast option buffer attached to the pcb; 2507 * allocate one and initialize to default values. 2508 */ 2509 im6o = (struct ip6_moptions *) 2510 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2511 2512 *im6op = im6o; 2513 im6o->im6o_multicast_ifp = NULL; 2514 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2515 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2516 LIST_INIT(&im6o->im6o_memberships); 2517 } 2518 2519 switch (optname) { 2520 2521 case IPV6_MULTICAST_IF: 2522 /* 2523 * Select the interface for outgoing multicast packets. 2524 */ 2525 if (m == NULL || m->m_len != sizeof(u_int)) { 2526 error = EINVAL; 2527 break; 2528 } 2529 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2530 if (ifindex < 0 || if_index < ifindex) { 2531 error = ENXIO; /* XXX EINVAL? */ 2532 break; 2533 } 2534 ifp = ifindex2ifnet[ifindex]; 2535 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2536 error = EADDRNOTAVAIL; 2537 break; 2538 } 2539 im6o->im6o_multicast_ifp = ifp; 2540 break; 2541 2542 case IPV6_MULTICAST_HOPS: 2543 { 2544 /* 2545 * Set the IP6 hoplimit for outgoing multicast packets. 2546 */ 2547 int optval; 2548 if (m == NULL || m->m_len != sizeof(int)) { 2549 error = EINVAL; 2550 break; 2551 } 2552 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2553 if (optval < -1 || optval >= 256) 2554 error = EINVAL; 2555 else if (optval == -1) 2556 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2557 else 2558 im6o->im6o_multicast_hlim = optval; 2559 break; 2560 } 2561 2562 case IPV6_MULTICAST_LOOP: 2563 /* 2564 * Set the loopback flag for outgoing multicast packets. 2565 * Must be zero or one. 2566 */ 2567 if (m == NULL || m->m_len != sizeof(u_int)) { 2568 error = EINVAL; 2569 break; 2570 } 2571 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2572 if (loop > 1) { 2573 error = EINVAL; 2574 break; 2575 } 2576 im6o->im6o_multicast_loop = loop; 2577 break; 2578 2579 case IPV6_JOIN_GROUP: 2580 /* 2581 * Add a multicast group membership. 2582 * Group must be a valid IP6 multicast address. 2583 */ 2584 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2585 error = EINVAL; 2586 break; 2587 } 2588 mreq = mtod(m, struct ipv6_mreq *); 2589 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2590 /* 2591 * We use the unspecified address to specify to accept 2592 * all multicast addresses. Only super user is allowed 2593 * to do this. 2594 */ 2595 if (suser(td)) 2596 { 2597 error = EACCES; 2598 break; 2599 } 2600 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2601 error = EINVAL; 2602 break; 2603 } 2604 2605 /* 2606 * If the interface is specified, validate it. 2607 */ 2608 if (mreq->ipv6mr_interface < 0 2609 || if_index < mreq->ipv6mr_interface) { 2610 error = ENXIO; /* XXX EINVAL? */ 2611 break; 2612 } 2613 /* 2614 * If no interface was explicitly specified, choose an 2615 * appropriate one according to the given multicast address. 2616 */ 2617 if (mreq->ipv6mr_interface == 0) { 2618 /* 2619 * If the multicast address is in node-local scope, 2620 * the interface should be a loopback interface. 2621 * Otherwise, look up the routing table for the 2622 * address, and choose the outgoing interface. 2623 * XXX: is it a good approach? 2624 */ 2625 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2626 ifp = &loif[0]; 2627 } else { 2628 ro.ro_rt = NULL; 2629 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2630 bzero(dst, sizeof(*dst)); 2631 dst->sin6_len = sizeof(struct sockaddr_in6); 2632 dst->sin6_family = AF_INET6; 2633 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2634 rtalloc((struct route *)&ro); 2635 if (ro.ro_rt == NULL) { 2636 error = EADDRNOTAVAIL; 2637 break; 2638 } 2639 ifp = ro.ro_rt->rt_ifp; 2640 rtfree(ro.ro_rt); 2641 } 2642 } else 2643 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2644 2645 /* 2646 * See if we found an interface, and confirm that it 2647 * supports multicast 2648 */ 2649 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2650 error = EADDRNOTAVAIL; 2651 break; 2652 } 2653 /* 2654 * Put interface index into the multicast address, 2655 * if the address has link-local scope. 2656 */ 2657 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2658 mreq->ipv6mr_multiaddr.s6_addr16[1] 2659 = htons(mreq->ipv6mr_interface); 2660 } 2661 /* 2662 * See if the membership already exists. 2663 */ 2664 for (imm = im6o->im6o_memberships.lh_first; 2665 imm != NULL; imm = imm->i6mm_chain.le_next) 2666 if (imm->i6mm_maddr->in6m_ifp == ifp && 2667 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2668 &mreq->ipv6mr_multiaddr)) 2669 break; 2670 if (imm != NULL) { 2671 error = EADDRINUSE; 2672 break; 2673 } 2674 /* 2675 * Everything looks good; add a new record to the multicast 2676 * address list for the given interface. 2677 */ 2678 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2679 if ((imm->i6mm_maddr = 2680 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2681 kfree(imm, M_IPMADDR); 2682 break; 2683 } 2684 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2685 break; 2686 2687 case IPV6_LEAVE_GROUP: 2688 /* 2689 * Drop a multicast group membership. 2690 * Group must be a valid IP6 multicast address. 2691 */ 2692 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2693 error = EINVAL; 2694 break; 2695 } 2696 mreq = mtod(m, struct ipv6_mreq *); 2697 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2698 if (suser(td)) { 2699 error = EACCES; 2700 break; 2701 } 2702 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2703 error = EINVAL; 2704 break; 2705 } 2706 /* 2707 * If an interface address was specified, get a pointer 2708 * to its ifnet structure. 2709 */ 2710 if (mreq->ipv6mr_interface < 0 2711 || if_index < mreq->ipv6mr_interface) { 2712 error = ENXIO; /* XXX EINVAL? */ 2713 break; 2714 } 2715 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2716 /* 2717 * Put interface index into the multicast address, 2718 * if the address has link-local scope. 2719 */ 2720 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2721 mreq->ipv6mr_multiaddr.s6_addr16[1] 2722 = htons(mreq->ipv6mr_interface); 2723 } 2724 /* 2725 * Find the membership in the membership list. 2726 */ 2727 for (imm = im6o->im6o_memberships.lh_first; 2728 imm != NULL; imm = imm->i6mm_chain.le_next) { 2729 if ((ifp == NULL || 2730 imm->i6mm_maddr->in6m_ifp == ifp) && 2731 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2732 &mreq->ipv6mr_multiaddr)) 2733 break; 2734 } 2735 if (imm == NULL) { 2736 /* Unable to resolve interface */ 2737 error = EADDRNOTAVAIL; 2738 break; 2739 } 2740 /* 2741 * Give up the multicast address record to which the 2742 * membership points. 2743 */ 2744 LIST_REMOVE(imm, i6mm_chain); 2745 in6_delmulti(imm->i6mm_maddr); 2746 kfree(imm, M_IPMADDR); 2747 break; 2748 2749 default: 2750 error = EOPNOTSUPP; 2751 break; 2752 } 2753 2754 /* 2755 * If all options have default values, no need to keep the mbuf. 2756 */ 2757 if (im6o->im6o_multicast_ifp == NULL && 2758 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2759 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2760 im6o->im6o_memberships.lh_first == NULL) { 2761 kfree(*im6op, M_IPMOPTS); 2762 *im6op = NULL; 2763 } 2764 2765 return (error); 2766 } 2767 2768 /* 2769 * Return the IP6 multicast options in response to user getsockopt(). 2770 */ 2771 static int 2772 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2773 { 2774 u_int *hlim, *loop, *ifindex; 2775 2776 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2777 2778 switch (optname) { 2779 2780 case IPV6_MULTICAST_IF: 2781 ifindex = mtod(*mp, u_int *); 2782 (*mp)->m_len = sizeof(u_int); 2783 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2784 *ifindex = 0; 2785 else 2786 *ifindex = im6o->im6o_multicast_ifp->if_index; 2787 return (0); 2788 2789 case IPV6_MULTICAST_HOPS: 2790 hlim = mtod(*mp, u_int *); 2791 (*mp)->m_len = sizeof(u_int); 2792 if (im6o == NULL) 2793 *hlim = ip6_defmcasthlim; 2794 else 2795 *hlim = im6o->im6o_multicast_hlim; 2796 return (0); 2797 2798 case IPV6_MULTICAST_LOOP: 2799 loop = mtod(*mp, u_int *); 2800 (*mp)->m_len = sizeof(u_int); 2801 if (im6o == NULL) 2802 *loop = ip6_defmcasthlim; 2803 else 2804 *loop = im6o->im6o_multicast_loop; 2805 return (0); 2806 2807 default: 2808 return (EOPNOTSUPP); 2809 } 2810 } 2811 2812 /* 2813 * Discard the IP6 multicast options. 2814 */ 2815 void 2816 ip6_freemoptions(struct ip6_moptions *im6o) 2817 { 2818 struct in6_multi_mship *imm; 2819 2820 if (im6o == NULL) 2821 return; 2822 2823 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2824 LIST_REMOVE(imm, i6mm_chain); 2825 if (imm->i6mm_maddr) 2826 in6_delmulti(imm->i6mm_maddr); 2827 kfree(imm, M_IPMADDR); 2828 } 2829 kfree(im6o, M_IPMOPTS); 2830 } 2831 2832 /* 2833 * Set a particular packet option, as a sticky option or an ancillary data 2834 * item. "len" can be 0 only when it's a sticky option. 2835 * We have 4 cases of combination of "sticky" and "cmsg": 2836 * "sticky=0, cmsg=0": impossible 2837 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2838 * "sticky=1, cmsg=0": RFC3542 socket option 2839 * "sticky=1, cmsg=1": RFC2292 socket option 2840 */ 2841 static int 2842 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2843 int sticky, int cmsg, int uproto, int priv) 2844 { 2845 int minmtupolicy, preftemp; 2846 //int error; 2847 2848 if (!sticky && !cmsg) { 2849 kprintf("ip6_setpktoption: impossible case\n"); 2850 return (EINVAL); 2851 } 2852 2853 /* 2854 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2855 * not be specified in the context of RFC3542. Conversely, 2856 * RFC3542 types should not be specified in the context of RFC2292. 2857 */ 2858 if (!cmsg) { 2859 switch (optname) { 2860 case IPV6_2292PKTINFO: 2861 case IPV6_2292HOPLIMIT: 2862 case IPV6_2292NEXTHOP: 2863 case IPV6_2292HOPOPTS: 2864 case IPV6_2292DSTOPTS: 2865 case IPV6_2292RTHDR: 2866 case IPV6_2292PKTOPTIONS: 2867 return (ENOPROTOOPT); 2868 } 2869 } 2870 if (sticky && cmsg) { 2871 switch (optname) { 2872 case IPV6_PKTINFO: 2873 case IPV6_HOPLIMIT: 2874 case IPV6_NEXTHOP: 2875 case IPV6_HOPOPTS: 2876 case IPV6_DSTOPTS: 2877 case IPV6_RTHDRDSTOPTS: 2878 case IPV6_RTHDR: 2879 case IPV6_USE_MIN_MTU: 2880 case IPV6_DONTFRAG: 2881 case IPV6_TCLASS: 2882 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2883 return (ENOPROTOOPT); 2884 } 2885 } 2886 2887 switch (optname) { 2888 case IPV6_2292PKTINFO: 2889 case IPV6_PKTINFO: 2890 { 2891 struct in6_pktinfo *pktinfo; 2892 if (len != sizeof(struct in6_pktinfo)) 2893 return (EINVAL); 2894 pktinfo = (struct in6_pktinfo *)buf; 2895 2896 /* 2897 * An application can clear any sticky IPV6_PKTINFO option by 2898 * doing a "regular" setsockopt with ipi6_addr being 2899 * in6addr_any and ipi6_ifindex being zero. 2900 * [RFC 3542, Section 6] 2901 */ 2902 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2903 pktinfo->ipi6_ifindex == 0 && 2904 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2905 ip6_clearpktopts(opt, optname); 2906 break; 2907 } 2908 2909 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2910 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2911 return (EINVAL); 2912 } 2913 2914 /* validate the interface index if specified. */ 2915 if (pktinfo->ipi6_ifindex > if_index || 2916 pktinfo->ipi6_ifindex < 0) { 2917 return (ENXIO); 2918 } 2919 /* 2920 * Check if the requested source address is indeed a 2921 * unicast address assigned to the node, and can be 2922 * used as the packet's source address. 2923 */ 2924 if (opt->ip6po_pktinfo != NULL && 2925 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2926 struct in6_ifaddr *ia6; 2927 struct sockaddr_in6 sin6; 2928 2929 bzero(&sin6, sizeof(sin6)); 2930 sin6.sin6_len = sizeof(sin6); 2931 sin6.sin6_family = AF_INET6; 2932 sin6.sin6_addr = 2933 opt->ip6po_pktinfo->ipi6_addr; 2934 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2935 if (ia6 == NULL || 2936 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2937 IN6_IFF_NOTREADY)) != 0) 2938 return (EADDRNOTAVAIL); 2939 } 2940 2941 /* 2942 * We store the address anyway, and let in6_selectsrc() 2943 * validate the specified address. This is because ipi6_addr 2944 * may not have enough information about its scope zone, and 2945 * we may need additional information (such as outgoing 2946 * interface or the scope zone of a destination address) to 2947 * disambiguate the scope. 2948 * XXX: the delay of the validation may confuse the 2949 * application when it is used as a sticky option. 2950 */ 2951 if (opt->ip6po_pktinfo == NULL) { 2952 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2953 M_IP6OPT, M_NOWAIT); 2954 if (opt->ip6po_pktinfo == NULL) 2955 return (ENOBUFS); 2956 } 2957 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2958 break; 2959 } 2960 2961 case IPV6_2292HOPLIMIT: 2962 case IPV6_HOPLIMIT: 2963 { 2964 int *hlimp; 2965 2966 /* 2967 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2968 * to simplify the ordering among hoplimit options. 2969 */ 2970 if (optname == IPV6_HOPLIMIT && sticky) 2971 return (ENOPROTOOPT); 2972 2973 if (len != sizeof(int)) 2974 return (EINVAL); 2975 hlimp = (int *)buf; 2976 if (*hlimp < -1 || *hlimp > 255) 2977 return (EINVAL); 2978 2979 opt->ip6po_hlim = *hlimp; 2980 break; 2981 } 2982 2983 case IPV6_TCLASS: 2984 { 2985 int tclass; 2986 2987 if (len != sizeof(int)) 2988 return (EINVAL); 2989 tclass = *(int *)buf; 2990 if (tclass < -1 || tclass > 255) 2991 return (EINVAL); 2992 2993 opt->ip6po_tclass = tclass; 2994 break; 2995 } 2996 2997 case IPV6_2292NEXTHOP: 2998 case IPV6_NEXTHOP: 2999 if (!priv) 3000 return (EPERM); 3001 3002 if (len == 0) { /* just remove the option */ 3003 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3004 break; 3005 } 3006 3007 /* check if cmsg_len is large enough for sa_len */ 3008 if (len < sizeof(struct sockaddr) || len < *buf) 3009 return (EINVAL); 3010 3011 switch (((struct sockaddr *)buf)->sa_family) { 3012 case AF_INET6: 3013 { 3014 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3015 //int error; 3016 3017 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3018 return (EINVAL); 3019 3020 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3021 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3022 return (EINVAL); 3023 } 3024 break; 3025 } 3026 case AF_LINK: /* should eventually be supported */ 3027 default: 3028 return (EAFNOSUPPORT); 3029 } 3030 3031 /* turn off the previous option, then set the new option. */ 3032 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3033 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3034 if (opt->ip6po_nexthop == NULL) 3035 return (ENOBUFS); 3036 bcopy(buf, opt->ip6po_nexthop, *buf); 3037 break; 3038 3039 case IPV6_2292HOPOPTS: 3040 case IPV6_HOPOPTS: 3041 { 3042 struct ip6_hbh *hbh; 3043 int hbhlen; 3044 3045 /* 3046 * XXX: We don't allow a non-privileged user to set ANY HbH 3047 * options, since per-option restriction has too much 3048 * overhead. 3049 */ 3050 if (!priv) 3051 return (EPERM); 3052 if (len == 0) { 3053 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3054 break; /* just remove the option */ 3055 } 3056 3057 /* message length validation */ 3058 if (len < sizeof(struct ip6_hbh)) 3059 return (EINVAL); 3060 hbh = (struct ip6_hbh *)buf; 3061 hbhlen = (hbh->ip6h_len + 1) << 3; 3062 if (len != hbhlen) 3063 return (EINVAL); 3064 3065 /* turn off the previous option, then set the new option. */ 3066 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3067 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3068 if (opt->ip6po_hbh == NULL) 3069 return (ENOBUFS); 3070 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3071 3072 break; 3073 } 3074 3075 case IPV6_2292DSTOPTS: 3076 case IPV6_DSTOPTS: 3077 case IPV6_RTHDRDSTOPTS: 3078 { 3079 struct ip6_dest *dest, **newdest = NULL; 3080 int destlen; 3081 if (!priv) 3082 return (EPERM); 3083 3084 if (len == 0) { 3085 ip6_clearpktopts(opt, optname); 3086 break; /* just remove the option */ 3087 } 3088 3089 /* message length validation */ 3090 if (len < sizeof(struct ip6_dest)) 3091 return (EINVAL); 3092 dest = (struct ip6_dest *)buf; 3093 destlen = (dest->ip6d_len + 1) << 3; 3094 if (len != destlen) 3095 return (EINVAL); 3096 3097 /* 3098 * Determine the position that the destination options header 3099 * should be inserted; before or after the routing header. 3100 */ 3101 switch (optname) { 3102 case IPV6_2292DSTOPTS: 3103 /* 3104 * The old advacned API is ambiguous on this point. 3105 * Our approach is to determine the position based 3106 * according to the existence of a routing header. 3107 * Note, however, that this depends on the order of the 3108 * extension headers in the ancillary data; the 1st 3109 * part of the destination options header must appear 3110 * before the routing header in the ancillary data, 3111 * too. 3112 * RFC3542 solved the ambiguity by introducing 3113 * separate ancillary data or option types. 3114 */ 3115 if (opt->ip6po_rthdr == NULL) 3116 newdest = &opt->ip6po_dest1; 3117 else 3118 newdest = &opt->ip6po_dest2; 3119 break; 3120 case IPV6_RTHDRDSTOPTS: 3121 newdest = &opt->ip6po_dest1; 3122 break; 3123 case IPV6_DSTOPTS: 3124 newdest = &opt->ip6po_dest2; 3125 break; 3126 } 3127 3128 /* turn off the previous option, then set the new option. */ 3129 ip6_clearpktopts(opt, optname); 3130 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3131 if (*newdest == NULL) 3132 return (ENOBUFS); 3133 bcopy(dest, *newdest, destlen); 3134 3135 break; 3136 } 3137 3138 case IPV6_2292RTHDR: 3139 case IPV6_RTHDR: 3140 { 3141 struct ip6_rthdr *rth; 3142 int rthlen; 3143 3144 if (len == 0) { 3145 ip6_clearpktopts(opt, IPV6_RTHDR); 3146 break; /* just remove the option */ 3147 } 3148 3149 /* message length validation */ 3150 if (len < sizeof(struct ip6_rthdr)) 3151 return (EINVAL); 3152 rth = (struct ip6_rthdr *)buf; 3153 rthlen = (rth->ip6r_len + 1) << 3; 3154 if (len != rthlen) 3155 return (EINVAL); 3156 3157 switch (rth->ip6r_type) { 3158 default: 3159 return (EINVAL); /* not supported */ 3160 } 3161 3162 /* turn off the previous option */ 3163 ip6_clearpktopts(opt, IPV6_RTHDR); 3164 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3165 if (opt->ip6po_rthdr == NULL) 3166 return (ENOBUFS); 3167 bcopy(rth, opt->ip6po_rthdr, rthlen); 3168 3169 break; 3170 } 3171 3172 case IPV6_USE_MIN_MTU: 3173 if (len != sizeof(int)) 3174 return (EINVAL); 3175 minmtupolicy = *(int *)buf; 3176 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3177 minmtupolicy != IP6PO_MINMTU_DISABLE && 3178 minmtupolicy != IP6PO_MINMTU_ALL) { 3179 return (EINVAL); 3180 } 3181 opt->ip6po_minmtu = minmtupolicy; 3182 break; 3183 3184 case IPV6_DONTFRAG: 3185 if (len != sizeof(int)) 3186 return (EINVAL); 3187 3188 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3189 /* 3190 * we ignore this option for TCP sockets. 3191 * (RFC3542 leaves this case unspecified.) 3192 */ 3193 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3194 } else 3195 opt->ip6po_flags |= IP6PO_DONTFRAG; 3196 break; 3197 3198 case IPV6_PREFER_TEMPADDR: 3199 if (len != sizeof(int)) 3200 return (EINVAL); 3201 preftemp = *(int *)buf; 3202 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3203 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3204 preftemp != IP6PO_TEMPADDR_PREFER) { 3205 return (EINVAL); 3206 } 3207 opt->ip6po_prefer_tempaddr = preftemp; 3208 break; 3209 3210 default: 3211 return (ENOPROTOOPT); 3212 } /* end of switch */ 3213 3214 return (0); 3215 } 3216 3217 3218 /* 3219 * Set IPv6 outgoing packet options based on advanced API. 3220 */ 3221 int 3222 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3223 struct ip6_pktopts *stickyopt, int uproto, int priv) 3224 { 3225 struct cmsghdr *cm = NULL; 3226 3227 if (control == NULL || opt == NULL) 3228 return (EINVAL); 3229 3230 init_ip6pktopts(opt); 3231 3232 /* 3233 * XXX: Currently, we assume all the optional information is stored 3234 * in a single mbuf. 3235 */ 3236 if (stickyopt) { 3237 int error; 3238 3239 /* 3240 * If stickyopt is provided, make a local copy of the options 3241 * for this particular packet, then override them by ancillary 3242 * objects. 3243 * XXX: copypktopts() does not copy the cached route to a next 3244 * hop (if any). This is not very good in terms of efficiency, 3245 * but we can allow this since this option should be rarely 3246 * used. 3247 */ 3248 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3249 return (error); 3250 } 3251 3252 /* 3253 * XXX: Currently, we assume all the optional information is stored 3254 * in a single mbuf. 3255 */ 3256 if (control->m_next) 3257 return (EINVAL); 3258 3259 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3260 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3261 int error; 3262 3263 if (control->m_len < CMSG_LEN(0)) 3264 return (EINVAL); 3265 3266 cm = mtod(control, struct cmsghdr *); 3267 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3268 return (EINVAL); 3269 if (cm->cmsg_level != IPPROTO_IPV6) 3270 continue; 3271 3272 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3273 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3274 if (error) 3275 return (error); 3276 } 3277 3278 return (0); 3279 } 3280 3281 /* 3282 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3283 * packet to the input queue of a specified interface. Note that this 3284 * calls the output routine of the loopback "driver", but with an interface 3285 * pointer that might NOT be &loif -- easier than replicating that code here. 3286 */ 3287 void 3288 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3289 { 3290 struct mbuf *copym; 3291 struct ip6_hdr *ip6; 3292 3293 copym = m_copy(m, 0, M_COPYALL); 3294 if (copym == NULL) 3295 return; 3296 3297 /* 3298 * Make sure to deep-copy IPv6 header portion in case the data 3299 * is in an mbuf cluster, so that we can safely override the IPv6 3300 * header portion later. 3301 */ 3302 if ((copym->m_flags & M_EXT) != 0 || 3303 copym->m_len < sizeof(struct ip6_hdr)) { 3304 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3305 if (copym == NULL) 3306 return; 3307 } 3308 3309 #ifdef DIAGNOSTIC 3310 if (copym->m_len < sizeof(*ip6)) { 3311 m_freem(copym); 3312 return; 3313 } 3314 #endif 3315 3316 ip6 = mtod(copym, struct ip6_hdr *); 3317 /* 3318 * clear embedded scope identifiers if necessary. 3319 * in6_clearscope will touch the addresses only when necessary. 3320 */ 3321 in6_clearscope(&ip6->ip6_src); 3322 in6_clearscope(&ip6->ip6_dst); 3323 3324 if_simloop(ifp, copym, dst->sin6_family, 0); 3325 } 3326 3327 /* 3328 * Separate the IPv6 header from the payload into its own mbuf. 3329 * 3330 * Returns the new mbuf chain or the original mbuf if no payload. 3331 * Returns NULL if can't allocate new mbuf for header. 3332 */ 3333 static struct mbuf * 3334 ip6_splithdr(struct mbuf *m) 3335 { 3336 struct mbuf *mh; 3337 3338 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3339 return (m); 3340 3341 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 3342 if (mh == NULL) 3343 return (NULL); 3344 mh->m_len = sizeof(struct ip6_hdr); 3345 M_MOVE_PKTHDR(mh, m); 3346 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3347 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3348 m->m_data += sizeof(struct ip6_hdr); 3349 m->m_len -= sizeof(struct ip6_hdr); 3350 mh->m_next = m; 3351 return (mh); 3352 } 3353 3354 /* 3355 * Compute IPv6 extension header length. 3356 */ 3357 int 3358 ip6_optlen(struct in6pcb *in6p) 3359 { 3360 int len; 3361 3362 if (!in6p->in6p_outputopts) 3363 return 0; 3364 3365 len = 0; 3366 #define elen(x) \ 3367 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3368 3369 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3370 if (in6p->in6p_outputopts->ip6po_rthdr) 3371 /* dest1 is valid with rthdr only */ 3372 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3373 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3374 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3375 return len; 3376 #undef elen 3377 } 3378