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 #include <sys/priv.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #include <net/pfil.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet6/in6_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet/in_pcb.h> 97 #include <netinet6/nd6.h> 98 #include <netinet6/ip6protosw.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #ifdef INET6 103 #include <netinet6/ipsec6.h> 104 #endif 105 #include <netproto/key/key.h> 106 #endif /* IPSEC */ 107 108 #ifdef FAST_IPSEC 109 #include <netproto/ipsec/ipsec.h> 110 #include <netproto/ipsec/ipsec6.h> 111 #include <netproto/ipsec/key.h> 112 #endif 113 114 #include <net/ip6fw/ip6_fw.h> 115 116 #include <net/net_osdep.h> 117 118 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 119 120 struct ip6_exthdrs { 121 struct mbuf *ip6e_ip6; 122 struct mbuf *ip6e_hbh; 123 struct mbuf *ip6e_dest1; 124 struct mbuf *ip6e_rthdr; 125 struct mbuf *ip6e_dest2; 126 }; 127 128 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 129 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 130 int, int, int, int); 131 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 132 struct socket *, struct sockopt *); 133 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 134 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 135 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 136 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 137 struct ifnet *, struct in6_addr *, u_long *, int *); 138 static int copyexthdr (void *, struct mbuf **); 139 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 140 struct ip6_frag **); 141 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 142 static struct mbuf *ip6_splithdr (struct mbuf *); 143 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 144 145 /* 146 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 147 * header (with pri, len, nxt, hlim, src, dst). 148 * This function may modify ver and hlim only. 149 * The mbuf chain containing the packet will be freed. 150 * The mbuf opt, if present, will not be freed. 151 * 152 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 153 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 154 * which is rt_rmx.rmx_mtu. 155 */ 156 int 157 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 158 int flags, struct ip6_moptions *im6o, 159 struct ifnet **ifpp, /* XXX: just for statistics */ 160 struct inpcb *inp) 161 { 162 struct ip6_hdr *ip6, *mhip6; 163 struct ifnet *ifp, *origifp; 164 struct mbuf *m = m0; 165 struct mbuf *mprev; 166 u_char *nexthdrp; 167 int hlen, tlen, len, off; 168 struct route_in6 ip6route; 169 struct sockaddr_in6 *dst; 170 int error = 0; 171 struct in6_ifaddr *ia = NULL; 172 u_long mtu; 173 int alwaysfrag, dontfrag; 174 u_int32_t optlen, plen = 0, unfragpartlen; 175 struct ip6_exthdrs exthdrs; 176 struct in6_addr finaldst; 177 struct route_in6 *ro_pmtu = NULL; 178 boolean_t hdrsplit = FALSE; 179 boolean_t needipsec = FALSE; 180 #ifdef IPSEC 181 boolean_t needipsectun = FALSE; 182 struct secpolicy *sp = NULL; 183 struct socket *so = inp ? inp->inp_socket : NULL; 184 185 ip6 = mtod(m, struct ip6_hdr *); 186 #endif 187 #ifdef FAST_IPSEC 188 boolean_t needipsectun = FALSE; 189 struct secpolicy *sp = NULL; 190 191 ip6 = mtod(m, struct ip6_hdr *); 192 #endif 193 194 bzero(&exthdrs, sizeof exthdrs); 195 196 if (opt) { 197 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 198 goto freehdrs; 199 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 200 goto freehdrs; 201 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 202 goto freehdrs; 203 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 204 goto freehdrs; 205 } 206 207 #ifdef IPSEC 208 /* get a security policy for this packet */ 209 if (so == NULL) 210 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 211 else 212 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 213 214 if (sp == NULL) { 215 ipsec6stat.out_inval++; 216 goto freehdrs; 217 } 218 219 error = 0; 220 221 /* check policy */ 222 switch (sp->policy) { 223 case IPSEC_POLICY_DISCARD: 224 /* 225 * This packet is just discarded. 226 */ 227 ipsec6stat.out_polvio++; 228 goto freehdrs; 229 230 case IPSEC_POLICY_BYPASS: 231 case IPSEC_POLICY_NONE: 232 /* no need to do IPsec. */ 233 needipsec = FALSE; 234 break; 235 236 case IPSEC_POLICY_IPSEC: 237 if (sp->req == NULL) { 238 error = key_spdacquire(sp); /* acquire a policy */ 239 goto freehdrs; 240 } 241 needipsec = TRUE; 242 break; 243 244 case IPSEC_POLICY_ENTRUST: 245 default: 246 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 247 } 248 #endif /* IPSEC */ 249 #ifdef FAST_IPSEC 250 /* get a security policy for this packet */ 251 if (inp == NULL) 252 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 253 else 254 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 255 256 if (sp == NULL) { 257 newipsecstat.ips_out_inval++; 258 goto freehdrs; 259 } 260 261 error = 0; 262 263 /* check policy */ 264 switch (sp->policy) { 265 case IPSEC_POLICY_DISCARD: 266 /* 267 * This packet is just discarded. 268 */ 269 newipsecstat.ips_out_polvio++; 270 goto freehdrs; 271 272 case IPSEC_POLICY_BYPASS: 273 case IPSEC_POLICY_NONE: 274 /* no need to do IPsec. */ 275 needipsec = FALSE; 276 break; 277 278 case IPSEC_POLICY_IPSEC: 279 if (sp->req == NULL) { 280 error = key_spdacquire(sp); /* acquire a policy */ 281 goto freehdrs; 282 } 283 needipsec = TRUE; 284 break; 285 286 case IPSEC_POLICY_ENTRUST: 287 default: 288 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 289 } 290 #endif /* FAST_IPSEC */ 291 292 /* 293 * Calculate the total length of the extension header chain. 294 * Keep the length of the unfragmentable part for fragmentation. 295 */ 296 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 297 m_lengthm(exthdrs.ip6e_dest1, NULL) + 298 m_lengthm(exthdrs.ip6e_rthdr, NULL); 299 300 unfragpartlen = optlen + sizeof(struct ip6_hdr); 301 302 /* NOTE: we don't add AH/ESP length here. do that later. */ 303 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 304 305 /* 306 * If we need IPsec, or there is at least one extension header, 307 * separate IP6 header from the payload. 308 */ 309 if ((needipsec || optlen) && !hdrsplit) { 310 exthdrs.ip6e_ip6 = ip6_splithdr(m); 311 if (exthdrs.ip6e_ip6 == NULL) { 312 error = ENOBUFS; 313 goto freehdrs; 314 } 315 m = exthdrs.ip6e_ip6; 316 hdrsplit = TRUE; 317 } 318 319 /* adjust pointer */ 320 ip6 = mtod(m, struct ip6_hdr *); 321 322 /* adjust mbuf packet header length */ 323 m->m_pkthdr.len += optlen; 324 plen = m->m_pkthdr.len - sizeof(*ip6); 325 326 /* If this is a jumbo payload, insert a jumbo payload option. */ 327 if (plen > IPV6_MAXPACKET) { 328 if (!hdrsplit) { 329 exthdrs.ip6e_ip6 = ip6_splithdr(m); 330 if (exthdrs.ip6e_ip6 == NULL) { 331 error = ENOBUFS; 332 goto freehdrs; 333 } 334 m = exthdrs.ip6e_ip6; 335 hdrsplit = TRUE; 336 } 337 /* adjust pointer */ 338 ip6 = mtod(m, struct ip6_hdr *); 339 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 340 goto freehdrs; 341 ip6->ip6_plen = 0; 342 } else 343 ip6->ip6_plen = htons(plen); 344 345 /* 346 * Concatenate headers and fill in next header fields. 347 * Here we have, on "m" 348 * IPv6 payload 349 * and we insert headers accordingly. Finally, we should be getting: 350 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 351 * 352 * during the header composing process, "m" points to IPv6 header. 353 * "mprev" points to an extension header prior to esp. 354 */ 355 356 nexthdrp = &ip6->ip6_nxt; 357 mprev = m; 358 359 /* 360 * we treat dest2 specially. this makes IPsec processing 361 * much easier. the goal here is to make mprev point the 362 * mbuf prior to dest2. 363 * 364 * result: IPv6 dest2 payload 365 * m and mprev will point to IPv6 header. 366 */ 367 if (exthdrs.ip6e_dest2) { 368 if (!hdrsplit) 369 panic("assumption failed: hdr not split"); 370 exthdrs.ip6e_dest2->m_next = m->m_next; 371 m->m_next = exthdrs.ip6e_dest2; 372 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 373 ip6->ip6_nxt = IPPROTO_DSTOPTS; 374 } 375 376 /* 377 * Place m1 after mprev. 378 */ 379 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 380 do {\ 381 if (m1) {\ 382 if (!hdrsplit)\ 383 panic("assumption failed: hdr not split");\ 384 *mtod(m1, u_char *) = *nexthdrp;\ 385 *nexthdrp = (i);\ 386 nexthdrp = mtod(m1, u_char *);\ 387 m1->m_next = mprev->m_next;\ 388 mprev->m_next = m1;\ 389 mprev = m1;\ 390 }\ 391 } while (0) 392 393 /* 394 * result: IPv6 hbh dest1 rthdr dest2 payload 395 * m will point to IPv6 header. mprev will point to the 396 * extension header prior to dest2 (rthdr in the above case). 397 */ 398 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 399 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 400 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 401 402 #if defined(IPSEC) || defined(FAST_IPSEC) 403 if (needipsec) { 404 struct ipsec_output_state state; 405 int segleft_org = 0; 406 struct ip6_rthdr *rh = NULL; 407 408 /* 409 * pointers after IPsec headers are not valid any more. 410 * other pointers need a great care too. 411 * (IPsec routines should not mangle mbufs prior to AH/ESP) 412 */ 413 exthdrs.ip6e_dest2 = NULL; 414 415 if (exthdrs.ip6e_rthdr) { 416 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 417 segleft_org = rh->ip6r_segleft; 418 rh->ip6r_segleft = 0; 419 } 420 421 bzero(&state, sizeof state); 422 state.m = m; 423 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 424 &needipsectun); 425 m = state.m; 426 if (error) { 427 /* mbuf is already reclaimed in ipsec6_output_trans. */ 428 m = NULL; 429 switch (error) { 430 case EHOSTUNREACH: 431 case ENETUNREACH: 432 case EMSGSIZE: 433 case ENOBUFS: 434 case ENOMEM: 435 break; 436 default: 437 kprintf("ip6_output (ipsec): error code %d\n", 438 error); 439 /* fall through */ 440 case ENOENT: 441 /* don't show these error codes to the user */ 442 error = 0; 443 break; 444 } 445 goto bad; 446 } 447 if (exthdrs.ip6e_rthdr) { 448 /* ah6_output doesn't modify mbuf chain */ 449 rh->ip6r_segleft = segleft_org; 450 } 451 } 452 #endif 453 454 /* 455 * If there is a routing header, replace destination address field 456 * with the first hop of the routing header. 457 */ 458 if (exthdrs.ip6e_rthdr) { 459 struct ip6_rthdr *rh; 460 461 finaldst = ip6->ip6_dst; 462 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 463 switch (rh->ip6r_type) { 464 default: /* is it possible? */ 465 error = EINVAL; 466 goto bad; 467 } 468 } 469 470 /* Source address validation */ 471 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 472 !(flags & IPV6_DADOUTPUT)) { 473 error = EOPNOTSUPP; 474 ip6stat.ip6s_badscope++; 475 goto bad; 476 } 477 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 478 error = EOPNOTSUPP; 479 ip6stat.ip6s_badscope++; 480 goto bad; 481 } 482 483 ip6stat.ip6s_localout++; 484 485 /* 486 * Route packet. 487 */ 488 if (ro == NULL) { 489 ro = &ip6route; 490 bzero(ro, sizeof(*ro)); 491 } 492 ro_pmtu = ro; 493 if (opt && opt->ip6po_rthdr) 494 ro = &opt->ip6po_route; 495 dst = (struct sockaddr_in6 *)&ro->ro_dst; 496 /* 497 * If there is a cached route, 498 * check that it is to the same destination 499 * and is still up. If not, free it and try again. 500 */ 501 if (ro->ro_rt != NULL && 502 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 503 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 504 RTFREE(ro->ro_rt); 505 ro->ro_rt = NULL; 506 } 507 if (ro->ro_rt == NULL) { 508 bzero(dst, sizeof(*dst)); 509 dst->sin6_family = AF_INET6; 510 dst->sin6_len = sizeof(struct sockaddr_in6); 511 dst->sin6_addr = ip6->ip6_dst; 512 } 513 #if defined(IPSEC) || defined(FAST_IPSEC) 514 if (needipsec && needipsectun) { 515 struct ipsec_output_state state; 516 517 /* 518 * All the extension headers will become inaccessible 519 * (since they can be encrypted). 520 * Don't panic, we need no more updates to extension headers 521 * on inner IPv6 packet (since they are now encapsulated). 522 * 523 * IPv6 [ESP|AH] IPv6 [extension headers] payload 524 */ 525 bzero(&exthdrs, sizeof(exthdrs)); 526 exthdrs.ip6e_ip6 = m; 527 528 bzero(&state, sizeof(state)); 529 state.m = m; 530 state.ro = (struct route *)ro; 531 state.dst = (struct sockaddr *)dst; 532 533 error = ipsec6_output_tunnel(&state, sp, flags); 534 535 m = state.m; 536 ro = (struct route_in6 *)state.ro; 537 dst = (struct sockaddr_in6 *)state.dst; 538 if (error) { 539 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 540 m0 = m = NULL; 541 m = NULL; 542 switch (error) { 543 case EHOSTUNREACH: 544 case ENETUNREACH: 545 case EMSGSIZE: 546 case ENOBUFS: 547 case ENOMEM: 548 break; 549 default: 550 kprintf("ip6_output (ipsec): error code %d\n", error); 551 /* fall through */ 552 case ENOENT: 553 /* don't show these error codes to the user */ 554 error = 0; 555 break; 556 } 557 goto bad; 558 } 559 560 exthdrs.ip6e_ip6 = m; 561 } 562 #endif 563 564 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 565 /* Unicast */ 566 567 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 568 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 569 /* xxx 570 * interface selection comes here 571 * if an interface is specified from an upper layer, 572 * ifp must point it. 573 */ 574 if (ro->ro_rt == NULL) { 575 /* 576 * non-bsdi always clone routes, if parent is 577 * PRF_CLONING. 578 */ 579 rtalloc((struct route *)ro); 580 } 581 if (ro->ro_rt == NULL) { 582 ip6stat.ip6s_noroute++; 583 error = EHOSTUNREACH; 584 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 585 goto bad; 586 } 587 ia = ifatoia6(ro->ro_rt->rt_ifa); 588 ifp = ro->ro_rt->rt_ifp; 589 ro->ro_rt->rt_use++; 590 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 591 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 592 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 593 594 in6_ifstat_inc(ifp, ifs6_out_request); 595 596 /* 597 * Check if the outgoing interface conflicts with 598 * the interface specified by ifi6_ifindex (if specified). 599 * Note that loopback interface is always okay. 600 * (this may happen when we are sending a packet to one of 601 * our own addresses.) 602 */ 603 if (opt && opt->ip6po_pktinfo 604 && opt->ip6po_pktinfo->ipi6_ifindex) { 605 if (!(ifp->if_flags & IFF_LOOPBACK) 606 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 607 ip6stat.ip6s_noroute++; 608 in6_ifstat_inc(ifp, ifs6_out_discard); 609 error = EHOSTUNREACH; 610 goto bad; 611 } 612 } 613 614 if (opt && opt->ip6po_hlim != -1) 615 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 616 } else { 617 /* Multicast */ 618 struct in6_multi *in6m; 619 620 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 621 622 /* 623 * See if the caller provided any multicast options 624 */ 625 ifp = NULL; 626 if (im6o != NULL) { 627 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 628 if (im6o->im6o_multicast_ifp != NULL) 629 ifp = im6o->im6o_multicast_ifp; 630 } else 631 ip6->ip6_hlim = ip6_defmcasthlim; 632 633 /* 634 * See if the caller provided the outgoing interface 635 * as an ancillary data. 636 * Boundary check for ifindex is assumed to be already done. 637 */ 638 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 639 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 640 641 /* 642 * If the destination is a node-local scope multicast, 643 * the packet should be loop-backed only. 644 */ 645 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 646 /* 647 * If the outgoing interface is already specified, 648 * it should be a loopback interface. 649 */ 650 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 651 ip6stat.ip6s_badscope++; 652 error = ENETUNREACH; /* XXX: better error? */ 653 /* XXX correct ifp? */ 654 in6_ifstat_inc(ifp, ifs6_out_discard); 655 goto bad; 656 } else { 657 ifp = &loif[0]; 658 } 659 } 660 661 if (opt && opt->ip6po_hlim != -1) 662 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 663 664 /* 665 * If caller did not provide an interface lookup a 666 * default in the routing table. This is either a 667 * default for the speicfied group (i.e. a host 668 * route), or a multicast default (a route for the 669 * ``net'' ff00::/8). 670 */ 671 if (ifp == NULL) { 672 if (ro->ro_rt == NULL) { 673 ro->ro_rt = 674 rtpurelookup((struct sockaddr *)&ro->ro_dst); 675 } 676 if (ro->ro_rt == NULL) { 677 ip6stat.ip6s_noroute++; 678 error = EHOSTUNREACH; 679 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 680 goto bad; 681 } 682 ia = ifatoia6(ro->ro_rt->rt_ifa); 683 ifp = ro->ro_rt->rt_ifp; 684 ro->ro_rt->rt_use++; 685 } 686 687 if (!(flags & IPV6_FORWARDING)) 688 in6_ifstat_inc(ifp, ifs6_out_request); 689 in6_ifstat_inc(ifp, ifs6_out_mcast); 690 691 /* 692 * Confirm that the outgoing interface supports multicast. 693 */ 694 if (!(ifp->if_flags & IFF_MULTICAST)) { 695 ip6stat.ip6s_noroute++; 696 in6_ifstat_inc(ifp, ifs6_out_discard); 697 error = ENETUNREACH; 698 goto bad; 699 } 700 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 701 if (in6m != NULL && 702 (im6o == NULL || im6o->im6o_multicast_loop)) { 703 /* 704 * If we belong to the destination multicast group 705 * on the outgoing interface, and the caller did not 706 * forbid loopback, loop back a copy. 707 */ 708 ip6_mloopback(ifp, m, dst); 709 } else { 710 /* 711 * If we are acting as a multicast router, perform 712 * multicast forwarding as if the packet had just 713 * arrived on the interface to which we are about 714 * to send. The multicast forwarding function 715 * recursively calls this function, using the 716 * IPV6_FORWARDING flag to prevent infinite recursion. 717 * 718 * Multicasts that are looped back by ip6_mloopback(), 719 * above, will be forwarded by the ip6_input() routine, 720 * if necessary. 721 */ 722 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 723 if (ip6_mforward(ip6, ifp, m) != 0) { 724 m_freem(m); 725 goto done; 726 } 727 } 728 } 729 /* 730 * Multicasts with a hoplimit of zero may be looped back, 731 * above, but must not be transmitted on a network. 732 * Also, multicasts addressed to the loopback interface 733 * are not sent -- the above call to ip6_mloopback() will 734 * loop back a copy if this host actually belongs to the 735 * destination group on the loopback interface. 736 */ 737 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 738 m_freem(m); 739 goto done; 740 } 741 } 742 743 /* 744 * Fill the outgoing inteface to tell the upper layer 745 * to increment per-interface statistics. 746 */ 747 if (ifpp) 748 *ifpp = ifp; 749 750 /* Determine path MTU. */ 751 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 752 &alwaysfrag)) != 0) 753 goto bad; 754 755 /* 756 * The caller of this function may specify to use the minimum MTU 757 * in some cases. 758 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 759 * setting. The logic is a bit complicated; by default, unicast 760 * packets will follow path MTU while multicast packets will be sent at 761 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 762 * including unicast ones will be sent at the minimum MTU. Multicast 763 * packets will always be sent at the minimum MTU unless 764 * IP6PO_MINMTU_DISABLE is explicitly specified. 765 * See RFC 3542 for more details. 766 */ 767 if (mtu > IPV6_MMTU) { 768 if ((flags & IPV6_MINMTU)) 769 mtu = IPV6_MMTU; 770 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 771 mtu = IPV6_MMTU; 772 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 773 (opt == NULL || 774 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 775 mtu = IPV6_MMTU; 776 } 777 } 778 779 /* Fake scoped addresses */ 780 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 781 /* 782 * If source or destination address is a scoped address, and 783 * the packet is going to be sent to a loopback interface, 784 * we should keep the original interface. 785 */ 786 787 /* 788 * XXX: this is a very experimental and temporary solution. 789 * We eventually have sockaddr_in6 and use the sin6_scope_id 790 * field of the structure here. 791 * We rely on the consistency between two scope zone ids 792 * of source and destination, which should already be assured. 793 * Larger scopes than link will be supported in the future. 794 */ 795 origifp = NULL; 796 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 797 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 798 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 799 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 800 /* 801 * XXX: origifp can be NULL even in those two cases above. 802 * For example, if we remove the (only) link-local address 803 * from the loopback interface, and try to send a link-local 804 * address without link-id information. Then the source 805 * address is ::1, and the destination address is the 806 * link-local address with its s6_addr16[1] being zero. 807 * What is worse, if the packet goes to the loopback interface 808 * by a default rejected route, the null pointer would be 809 * passed to looutput, and the kernel would hang. 810 * The following last resort would prevent such disaster. 811 */ 812 if (origifp == NULL) 813 origifp = ifp; 814 } 815 else 816 origifp = ifp; 817 /* 818 * clear embedded scope identifiers if necessary. 819 * in6_clearscope will touch the addresses only when necessary. 820 */ 821 in6_clearscope(&ip6->ip6_src); 822 in6_clearscope(&ip6->ip6_dst); 823 824 /* 825 * Check with the firewall... 826 */ 827 if (ip6_fw_enable && ip6_fw_chk_ptr) { 828 u_short port = 0; 829 830 m->m_pkthdr.rcvif = NULL; /* XXX */ 831 /* If ipfw says divert, we have to just drop packet */ 832 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 833 m_freem(m); 834 goto done; 835 } 836 if (!m) { 837 error = EACCES; 838 goto done; 839 } 840 } 841 842 /* 843 * If the outgoing packet contains a hop-by-hop options header, 844 * it must be examined and processed even by the source node. 845 * (RFC 2460, section 4.) 846 */ 847 if (exthdrs.ip6e_hbh) { 848 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 849 u_int32_t dummy1; /* XXX unused */ 850 u_int32_t dummy2; /* XXX unused */ 851 852 #ifdef DIAGNOSTIC 853 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 854 panic("ip6e_hbh is not continuous"); 855 #endif 856 /* 857 * XXX: if we have to send an ICMPv6 error to the sender, 858 * we need the M_LOOP flag since icmp6_error() expects 859 * the IPv6 and the hop-by-hop options header are 860 * continuous unless the flag is set. 861 */ 862 m->m_flags |= M_LOOP; 863 m->m_pkthdr.rcvif = ifp; 864 if (ip6_process_hopopts(m, 865 (u_int8_t *)(hbh + 1), 866 ((hbh->ip6h_len + 1) << 3) - 867 sizeof(struct ip6_hbh), 868 &dummy1, &dummy2) < 0) { 869 /* m was already freed at this point */ 870 error = EINVAL;/* better error? */ 871 goto done; 872 } 873 m->m_flags &= ~M_LOOP; /* XXX */ 874 m->m_pkthdr.rcvif = NULL; 875 } 876 877 /* 878 * Run through list of hooks for output packets. 879 */ 880 if (pfil_has_hooks(&inet6_pfil_hook)) { 881 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 882 if (error != 0 || m == NULL) 883 goto done; 884 ip6 = mtod(m, struct ip6_hdr *); 885 } 886 887 /* 888 * Send the packet to the outgoing interface. 889 * If necessary, do IPv6 fragmentation before sending. 890 * 891 * the logic here is rather complex: 892 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 893 * 1-a: send as is if tlen <= path mtu 894 * 1-b: fragment if tlen > path mtu 895 * 896 * 2: if user asks us not to fragment (dontfrag == 1) 897 * 2-a: send as is if tlen <= interface mtu 898 * 2-b: error if tlen > interface mtu 899 * 900 * 3: if we always need to attach fragment header (alwaysfrag == 1) 901 * always fragment 902 * 903 * 4: if dontfrag == 1 && alwaysfrag == 1 904 * error, as we cannot handle this conflicting request 905 */ 906 tlen = m->m_pkthdr.len; 907 908 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 909 dontfrag = 1; 910 else 911 dontfrag = 0; 912 if (dontfrag && alwaysfrag) { /* case 4 */ 913 /* conflicting request - can't transmit */ 914 error = EMSGSIZE; 915 goto bad; 916 } 917 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 918 /* 919 * Even if the DONTFRAG option is specified, we cannot send the 920 * packet when the data length is larger than the MTU of the 921 * outgoing interface. 922 * Notify the error by sending IPV6_PATHMTU ancillary data as 923 * well as returning an error code (the latter is not described 924 * in the API spec.) 925 */ 926 u_int32_t mtu32; 927 struct ip6ctlparam ip6cp; 928 929 mtu32 = (u_int32_t)mtu; 930 bzero(&ip6cp, sizeof(ip6cp)); 931 ip6cp.ip6c_cmdarg = (void *)&mtu32; 932 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 933 (void *)&ip6cp); 934 935 error = EMSGSIZE; 936 goto bad; 937 } 938 939 /* 940 * transmit packet without fragmentation 941 */ 942 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 943 struct in6_ifaddr *ia6; 944 945 ip6 = mtod(m, struct ip6_hdr *); 946 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 947 if (ia6) { 948 /* Record statistics for this interface address. */ 949 ia6->ia_ifa.if_opackets++; 950 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 951 } 952 #ifdef IPSEC 953 /* clean ipsec history once it goes out of the node */ 954 ipsec_delaux(m); 955 #endif 956 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 957 goto done; 958 } 959 960 /* 961 * try to fragment the packet. case 1-b and 3 962 */ 963 if (mtu < IPV6_MMTU) { 964 /* 965 * note that path MTU is never less than IPV6_MMTU 966 * (see icmp6_input). 967 */ 968 error = EMSGSIZE; 969 in6_ifstat_inc(ifp, ifs6_out_fragfail); 970 goto bad; 971 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 972 error = EMSGSIZE; 973 in6_ifstat_inc(ifp, ifs6_out_fragfail); 974 goto bad; 975 } else { 976 struct mbuf **mnext, *m_frgpart; 977 struct ip6_frag *ip6f; 978 u_int32_t id = htonl(ip6_id++); 979 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 980 u_char nextproto; 981 982 /* 983 * Too large for the destination or interface; 984 * fragment if possible. 985 * Must be able to put at least 8 bytes per fragment. 986 */ 987 hlen = unfragpartlen; 988 if (mtu > IPV6_MAXPACKET) 989 mtu = IPV6_MAXPACKET; 990 991 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 992 if (len < 8) { 993 error = EMSGSIZE; 994 in6_ifstat_inc(ifp, ifs6_out_fragfail); 995 goto bad; 996 } 997 998 /* 999 * Verify that we have any chance at all of being able to queue 1000 * the packet or packet fragments 1001 */ 1002 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1003 < tlen /* - hlen */)) { 1004 error = ENOBUFS; 1005 ip6stat.ip6s_odropped++; 1006 goto bad; 1007 } 1008 1009 mnext = &m->m_nextpkt; 1010 1011 /* 1012 * Change the next header field of the last header in the 1013 * unfragmentable part. 1014 */ 1015 if (exthdrs.ip6e_rthdr) { 1016 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1017 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1018 } else if (exthdrs.ip6e_dest1) { 1019 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1020 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1021 } else if (exthdrs.ip6e_hbh) { 1022 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1023 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1024 } else { 1025 nextproto = ip6->ip6_nxt; 1026 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1027 } 1028 1029 /* 1030 * Loop through length of segment after first fragment, 1031 * make new header and copy data of each part and link onto 1032 * chain. 1033 */ 1034 m0 = m; 1035 for (off = hlen; off < tlen; off += len) { 1036 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1037 if (!m) { 1038 error = ENOBUFS; 1039 ip6stat.ip6s_odropped++; 1040 goto sendorfree; 1041 } 1042 m->m_pkthdr.rcvif = NULL; 1043 m->m_flags = m0->m_flags & M_COPYFLAGS; 1044 *mnext = m; 1045 mnext = &m->m_nextpkt; 1046 m->m_data += max_linkhdr; 1047 mhip6 = mtod(m, struct ip6_hdr *); 1048 *mhip6 = *ip6; 1049 m->m_len = sizeof(*mhip6); 1050 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1051 if (error) { 1052 ip6stat.ip6s_odropped++; 1053 goto sendorfree; 1054 } 1055 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1056 if (off + len >= tlen) 1057 len = tlen - off; 1058 else 1059 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1060 mhip6->ip6_plen = htons((u_short)(len + hlen + 1061 sizeof(*ip6f) - 1062 sizeof(struct ip6_hdr))); 1063 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1064 error = ENOBUFS; 1065 ip6stat.ip6s_odropped++; 1066 goto sendorfree; 1067 } 1068 m_cat(m, m_frgpart); 1069 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1070 m->m_pkthdr.rcvif = NULL; 1071 ip6f->ip6f_reserved = 0; 1072 ip6f->ip6f_ident = id; 1073 ip6f->ip6f_nxt = nextproto; 1074 ip6stat.ip6s_ofragments++; 1075 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1076 } 1077 1078 in6_ifstat_inc(ifp, ifs6_out_fragok); 1079 } 1080 1081 /* 1082 * Remove leading garbages. 1083 */ 1084 sendorfree: 1085 m = m0->m_nextpkt; 1086 m0->m_nextpkt = NULL; 1087 m_freem(m0); 1088 for (m0 = m; m; m = m0) { 1089 m0 = m->m_nextpkt; 1090 m->m_nextpkt = NULL; 1091 if (error == 0) { 1092 /* Record statistics for this interface address. */ 1093 if (ia) { 1094 ia->ia_ifa.if_opackets++; 1095 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1096 } 1097 #ifdef IPSEC 1098 /* clean ipsec history once it goes out of the node */ 1099 ipsec_delaux(m); 1100 #endif 1101 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1102 } else 1103 m_freem(m); 1104 } 1105 1106 if (error == 0) 1107 ip6stat.ip6s_fragmented++; 1108 1109 done: 1110 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1111 RTFREE(ro->ro_rt); 1112 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1113 RTFREE(ro_pmtu->ro_rt); 1114 } 1115 1116 #ifdef IPSEC 1117 if (sp != NULL) 1118 key_freesp(sp); 1119 #endif 1120 #ifdef FAST_IPSEC 1121 if (sp != NULL) 1122 KEY_FREESP(&sp); 1123 #endif 1124 1125 return (error); 1126 1127 freehdrs: 1128 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1129 m_freem(exthdrs.ip6e_dest1); 1130 m_freem(exthdrs.ip6e_rthdr); 1131 m_freem(exthdrs.ip6e_dest2); 1132 /* fall through */ 1133 bad: 1134 m_freem(m); 1135 goto done; 1136 } 1137 1138 static int 1139 copyexthdr(void *h, struct mbuf **mp) 1140 { 1141 struct ip6_ext *hdr = h; 1142 int hlen; 1143 struct mbuf *m; 1144 1145 if (hdr == NULL) 1146 return 0; 1147 1148 hlen = (hdr->ip6e_len + 1) * 8; 1149 if (hlen > MCLBYTES) 1150 return ENOBUFS; /* XXX */ 1151 1152 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0); 1153 if (!m) 1154 return ENOBUFS; 1155 m->m_len = hlen; 1156 1157 bcopy(hdr, mtod(m, caddr_t), hlen); 1158 1159 *mp = m; 1160 return 0; 1161 } 1162 1163 /* 1164 * Insert jumbo payload option. 1165 */ 1166 static int 1167 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1168 { 1169 struct mbuf *mopt; 1170 u_char *optbuf; 1171 u_int32_t v; 1172 1173 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1174 1175 /* 1176 * If there is no hop-by-hop options header, allocate new one. 1177 * If there is one but it doesn't have enough space to store the 1178 * jumbo payload option, allocate a cluster to store the whole options. 1179 * Otherwise, use it to store the options. 1180 */ 1181 if (exthdrs->ip6e_hbh == NULL) { 1182 MGET(mopt, MB_DONTWAIT, MT_DATA); 1183 if (mopt == NULL) 1184 return (ENOBUFS); 1185 mopt->m_len = JUMBOOPTLEN; 1186 optbuf = mtod(mopt, u_char *); 1187 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1188 exthdrs->ip6e_hbh = mopt; 1189 } else { 1190 struct ip6_hbh *hbh; 1191 1192 mopt = exthdrs->ip6e_hbh; 1193 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1194 /* 1195 * XXX assumption: 1196 * - exthdrs->ip6e_hbh is not referenced from places 1197 * other than exthdrs. 1198 * - exthdrs->ip6e_hbh is not an mbuf chain. 1199 */ 1200 int oldoptlen = mopt->m_len; 1201 struct mbuf *n; 1202 1203 /* 1204 * XXX: give up if the whole (new) hbh header does 1205 * not fit even in an mbuf cluster. 1206 */ 1207 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1208 return (ENOBUFS); 1209 1210 /* 1211 * As a consequence, we must always prepare a cluster 1212 * at this point. 1213 */ 1214 n = m_getcl(MB_DONTWAIT, MT_DATA, 0); 1215 if (!n) 1216 return (ENOBUFS); 1217 n->m_len = oldoptlen + JUMBOOPTLEN; 1218 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1219 optbuf = mtod(n, caddr_t) + oldoptlen; 1220 m_freem(mopt); 1221 mopt = exthdrs->ip6e_hbh = n; 1222 } else { 1223 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1224 mopt->m_len += JUMBOOPTLEN; 1225 } 1226 optbuf[0] = IP6OPT_PADN; 1227 optbuf[1] = 1; 1228 1229 /* 1230 * Adjust the header length according to the pad and 1231 * the jumbo payload option. 1232 */ 1233 hbh = mtod(mopt, struct ip6_hbh *); 1234 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1235 } 1236 1237 /* fill in the option. */ 1238 optbuf[2] = IP6OPT_JUMBO; 1239 optbuf[3] = 4; 1240 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1241 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1242 1243 /* finally, adjust the packet header length */ 1244 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1245 1246 return (0); 1247 #undef JUMBOOPTLEN 1248 } 1249 1250 /* 1251 * Insert fragment header and copy unfragmentable header portions. 1252 */ 1253 static int 1254 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1255 struct ip6_frag **frghdrp) 1256 { 1257 struct mbuf *n, *mlast; 1258 1259 if (hlen > sizeof(struct ip6_hdr)) { 1260 n = m_copym(m0, sizeof(struct ip6_hdr), 1261 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1262 if (n == NULL) 1263 return (ENOBUFS); 1264 m->m_next = n; 1265 } else 1266 n = m; 1267 1268 /* Search for the last mbuf of unfragmentable part. */ 1269 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1270 ; 1271 1272 if (!(mlast->m_flags & M_EXT) && 1273 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1274 /* use the trailing space of the last mbuf for the fragment hdr */ 1275 *frghdrp = 1276 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1277 mlast->m_len += sizeof(struct ip6_frag); 1278 m->m_pkthdr.len += sizeof(struct ip6_frag); 1279 } else { 1280 /* allocate a new mbuf for the fragment header */ 1281 struct mbuf *mfrg; 1282 1283 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1284 if (mfrg == NULL) 1285 return (ENOBUFS); 1286 mfrg->m_len = sizeof(struct ip6_frag); 1287 *frghdrp = mtod(mfrg, struct ip6_frag *); 1288 mlast->m_next = mfrg; 1289 } 1290 1291 return (0); 1292 } 1293 1294 static int 1295 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1296 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1297 int *alwaysfragp) 1298 { 1299 u_int32_t mtu = 0; 1300 int alwaysfrag = 0; 1301 int error = 0; 1302 1303 if (ro_pmtu != ro) { 1304 /* The first hop and the final destination may differ. */ 1305 struct sockaddr_in6 *sa6_dst = 1306 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1307 if (ro_pmtu->ro_rt && 1308 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1309 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1310 RTFREE(ro_pmtu->ro_rt); 1311 ro_pmtu->ro_rt = NULL; 1312 } 1313 if (ro_pmtu->ro_rt == NULL) { 1314 bzero(sa6_dst, sizeof(*sa6_dst)); 1315 sa6_dst->sin6_family = AF_INET6; 1316 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1317 sa6_dst->sin6_addr = *dst; 1318 1319 rtalloc((struct route *)ro_pmtu); 1320 } 1321 } 1322 if (ro_pmtu->ro_rt) { 1323 u_int32_t ifmtu; 1324 struct in_conninfo inc; 1325 1326 bzero(&inc, sizeof(inc)); 1327 inc.inc_flags = 1; /* IPv6 */ 1328 inc.inc6_faddr = *dst; 1329 1330 if (ifp == NULL) 1331 ifp = ro_pmtu->ro_rt->rt_ifp; 1332 ifmtu = IN6_LINKMTU(ifp); 1333 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1334 if (mtu == 0) 1335 mtu = ifmtu; 1336 else if (mtu < IPV6_MMTU) { 1337 /* 1338 * RFC2460 section 5, last paragraph: 1339 * if we record ICMPv6 too big message with 1340 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1341 * or smaller, with framgent header attached. 1342 * (fragment header is needed regardless from the 1343 * packet size, for translators to identify packets) 1344 */ 1345 alwaysfrag = 1; 1346 mtu = IPV6_MMTU; 1347 } else if (mtu > ifmtu) { 1348 /* 1349 * The MTU on the route is larger than the MTU on 1350 * the interface! This shouldn't happen, unless the 1351 * MTU of the interface has been changed after the 1352 * interface was brought up. Change the MTU in the 1353 * route to match the interface MTU (as long as the 1354 * field isn't locked). 1355 */ 1356 mtu = ifmtu; 1357 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1358 } 1359 } else if (ifp) { 1360 mtu = IN6_LINKMTU(ifp); 1361 } else 1362 error = EHOSTUNREACH; /* XXX */ 1363 1364 *mtup = mtu; 1365 if (alwaysfragp) 1366 *alwaysfragp = alwaysfrag; 1367 return (error); 1368 } 1369 1370 /* 1371 * IP6 socket option processing. 1372 */ 1373 int 1374 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1375 { 1376 int optdatalen,uproto; 1377 int privileged; 1378 struct inpcb *in6p = so->so_pcb; 1379 void *optdata; 1380 int error, optval; 1381 int level, op, optname; 1382 int optlen; 1383 struct thread *td; 1384 1385 if (sopt) { 1386 level = sopt->sopt_level; 1387 op = sopt->sopt_dir; 1388 optname = sopt->sopt_name; 1389 optlen = sopt->sopt_valsize; 1390 td = sopt->sopt_td; 1391 } else { 1392 panic("ip6_ctloutput: arg soopt is NULL"); 1393 /* NOT REACHED */ 1394 td = NULL; 1395 } 1396 error = optval = 0; 1397 1398 uproto = (int)so->so_proto->pr_protocol; 1399 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1; 1400 1401 if (level == IPPROTO_IPV6) { 1402 switch (op) { 1403 1404 case SOPT_SET: 1405 switch (optname) { 1406 case IPV6_2292PKTOPTIONS: 1407 #ifdef IPV6_PKTOPTIONS 1408 case IPV6_PKTOPTIONS: 1409 #endif 1410 { 1411 struct mbuf *m; 1412 1413 error = soopt_getm(sopt, &m); /* XXX */ 1414 if (error != 0) 1415 break; 1416 soopt_to_mbuf(sopt, m); /* XXX */ 1417 error = ip6_pcbopts(&in6p->in6p_outputopts, 1418 m, so, sopt); 1419 m_freem(m); /* XXX */ 1420 break; 1421 } 1422 1423 /* 1424 * Use of some Hop-by-Hop options or some 1425 * Destination options, might require special 1426 * privilege. That is, normal applications 1427 * (without special privilege) might be forbidden 1428 * from setting certain options in outgoing packets, 1429 * and might never see certain options in received 1430 * packets. [RFC 2292 Section 6] 1431 * KAME specific note: 1432 * KAME prevents non-privileged users from sending or 1433 * receiving ANY hbh/dst options in order to avoid 1434 * overhead of parsing options in the kernel. 1435 */ 1436 case IPV6_RECVHOPOPTS: 1437 case IPV6_RECVDSTOPTS: 1438 case IPV6_RECVRTHDRDSTOPTS: 1439 if (!privileged) 1440 return (EPERM); 1441 case IPV6_RECVPKTINFO: 1442 case IPV6_RECVHOPLIMIT: 1443 case IPV6_RECVRTHDR: 1444 case IPV6_RECVPATHMTU: 1445 case IPV6_RECVTCLASS: 1446 case IPV6_AUTOFLOWLABEL: 1447 case IPV6_HOPLIMIT: 1448 /* FALLTHROUGH */ 1449 case IPV6_UNICAST_HOPS: 1450 case IPV6_FAITH: 1451 1452 case IPV6_V6ONLY: 1453 if (optlen != sizeof(int)) { 1454 error = EINVAL; 1455 break; 1456 } 1457 error = soopt_to_kbuf(sopt, &optval, 1458 sizeof optval, sizeof optval); 1459 if (error) 1460 break; 1461 switch (optname) { 1462 1463 case IPV6_UNICAST_HOPS: 1464 if (optval < -1 || optval >= 256) 1465 error = EINVAL; 1466 else { 1467 /* -1 = kernel default */ 1468 in6p->in6p_hops = optval; 1469 1470 if ((in6p->in6p_vflag & 1471 INP_IPV4) != 0) 1472 in6p->inp_ip_ttl = optval; 1473 } 1474 break; 1475 #define OPTSET(bit) \ 1476 do { \ 1477 if (optval) \ 1478 in6p->in6p_flags |= (bit); \ 1479 else \ 1480 in6p->in6p_flags &= ~(bit); \ 1481 } while (0) 1482 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1483 /* 1484 * Although changed to RFC3542, It's better to also support RFC2292 API 1485 */ 1486 #define OPTSET2292(bit) \ 1487 do { \ 1488 in6p->in6p_flags |= IN6P_RFC2292; \ 1489 if (optval) \ 1490 in6p->in6p_flags |= (bit); \ 1491 else \ 1492 in6p->in6p_flags &= ~(bit); \ 1493 } while (/*CONSTCOND*/ 0) 1494 1495 case IPV6_RECVPKTINFO: 1496 /* cannot mix with RFC2292 */ 1497 if (OPTBIT(IN6P_RFC2292)) { 1498 error = EINVAL; 1499 break; 1500 } 1501 OPTSET(IN6P_PKTINFO); 1502 break; 1503 1504 case IPV6_HOPLIMIT: 1505 { 1506 struct ip6_pktopts **optp; 1507 1508 /* cannot mix with RFC2292 */ 1509 if (OPTBIT(IN6P_RFC2292)) { 1510 error = EINVAL; 1511 break; 1512 } 1513 optp = &in6p->in6p_outputopts; 1514 error = ip6_pcbopt(IPV6_HOPLIMIT, 1515 (u_char *)&optval, sizeof(optval), 1516 optp, uproto); 1517 break; 1518 } 1519 1520 case IPV6_RECVHOPLIMIT: 1521 /* cannot mix with RFC2292 */ 1522 if (OPTBIT(IN6P_RFC2292)) { 1523 error = EINVAL; 1524 break; 1525 } 1526 OPTSET(IN6P_HOPLIMIT); 1527 break; 1528 1529 case IPV6_RECVHOPOPTS: 1530 /* cannot mix with RFC2292 */ 1531 if (OPTBIT(IN6P_RFC2292)) { 1532 error = EINVAL; 1533 break; 1534 } 1535 OPTSET(IN6P_HOPOPTS); 1536 break; 1537 1538 case IPV6_RECVDSTOPTS: 1539 /* cannot mix with RFC2292 */ 1540 if (OPTBIT(IN6P_RFC2292)) { 1541 error = EINVAL; 1542 break; 1543 } 1544 OPTSET(IN6P_DSTOPTS); 1545 break; 1546 1547 case IPV6_RECVRTHDRDSTOPTS: 1548 /* cannot mix with RFC2292 */ 1549 if (OPTBIT(IN6P_RFC2292)) { 1550 error = EINVAL; 1551 break; 1552 } 1553 OPTSET(IN6P_RTHDRDSTOPTS); 1554 break; 1555 1556 case IPV6_RECVRTHDR: 1557 /* cannot mix with RFC2292 */ 1558 if (OPTBIT(IN6P_RFC2292)) { 1559 error = EINVAL; 1560 break; 1561 } 1562 OPTSET(IN6P_RTHDR); 1563 break; 1564 1565 case IPV6_RECVPATHMTU: 1566 /* 1567 * We ignore this option for TCP 1568 * sockets. 1569 * (RFC3542 leaves this case 1570 * unspecified.) 1571 */ 1572 if (uproto != IPPROTO_TCP) 1573 OPTSET(IN6P_MTU); 1574 break; 1575 1576 case IPV6_RECVTCLASS: 1577 /* cannot mix with RFC2292 XXX */ 1578 if (OPTBIT(IN6P_RFC2292)) { 1579 error = EINVAL; 1580 break; 1581 } 1582 OPTSET(IN6P_TCLASS); 1583 break; 1584 1585 case IPV6_AUTOFLOWLABEL: 1586 OPTSET(IN6P_AUTOFLOWLABEL); 1587 break; 1588 1589 case IPV6_FAITH: 1590 OPTSET(IN6P_FAITH); 1591 break; 1592 1593 case IPV6_V6ONLY: 1594 /* 1595 * make setsockopt(IPV6_V6ONLY) 1596 * available only prior to bind(2). 1597 */ 1598 if (in6p->in6p_lport || 1599 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1600 { 1601 error = EINVAL; 1602 break; 1603 } 1604 OPTSET(IN6P_IPV6_V6ONLY); 1605 if (optval) 1606 in6p->in6p_vflag &= ~INP_IPV4; 1607 else 1608 in6p->in6p_vflag |= INP_IPV4; 1609 break; 1610 } 1611 break; 1612 1613 case IPV6_TCLASS: 1614 case IPV6_DONTFRAG: 1615 case IPV6_USE_MIN_MTU: 1616 case IPV6_PREFER_TEMPADDR: 1617 if (optlen != sizeof(optval)) { 1618 error = EINVAL; 1619 break; 1620 } 1621 error = soopt_to_kbuf(sopt, &optval, 1622 sizeof optval, sizeof optval); 1623 if (error) 1624 break; 1625 { 1626 struct ip6_pktopts **optp; 1627 optp = &in6p->in6p_outputopts; 1628 error = ip6_pcbopt(optname, 1629 (u_char *)&optval, sizeof(optval), 1630 optp, uproto); 1631 break; 1632 } 1633 1634 case IPV6_2292PKTINFO: 1635 case IPV6_2292HOPLIMIT: 1636 case IPV6_2292HOPOPTS: 1637 case IPV6_2292DSTOPTS: 1638 case IPV6_2292RTHDR: 1639 /* RFC 2292 */ 1640 if (optlen != sizeof(int)) { 1641 error = EINVAL; 1642 break; 1643 } 1644 error = soopt_to_kbuf(sopt, &optval, 1645 sizeof optval, sizeof optval); 1646 if (error) 1647 break; 1648 switch (optname) { 1649 case IPV6_2292PKTINFO: 1650 OPTSET2292(IN6P_PKTINFO); 1651 break; 1652 case IPV6_2292HOPLIMIT: 1653 OPTSET2292(IN6P_HOPLIMIT); 1654 break; 1655 case IPV6_2292HOPOPTS: 1656 /* 1657 * Check super-user privilege. 1658 * See comments for IPV6_RECVHOPOPTS. 1659 */ 1660 if (!privileged) 1661 return (EPERM); 1662 OPTSET2292(IN6P_HOPOPTS); 1663 break; 1664 case IPV6_2292DSTOPTS: 1665 if (!privileged) 1666 return (EPERM); 1667 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1668 break; 1669 case IPV6_2292RTHDR: 1670 OPTSET2292(IN6P_RTHDR); 1671 break; 1672 } 1673 break; 1674 1675 case IPV6_PKTINFO: 1676 case IPV6_HOPOPTS: 1677 case IPV6_RTHDR: 1678 case IPV6_DSTOPTS: 1679 case IPV6_RTHDRDSTOPTS: 1680 case IPV6_NEXTHOP: 1681 { 1682 /* 1683 * New advanced API (RFC3542) 1684 */ 1685 u_char *optbuf; 1686 u_char optbuf_storage[MCLBYTES]; 1687 int optlen; 1688 struct ip6_pktopts **optp; 1689 1690 /* cannot mix with RFC2292 */ 1691 if (OPTBIT(IN6P_RFC2292)) { 1692 error = EINVAL; 1693 break; 1694 } 1695 1696 /* 1697 * We only ensure valsize is not too large 1698 * here. Further validation will be done 1699 * later. 1700 */ 1701 error = soopt_to_kbuf(sopt, optbuf_storage, 1702 sizeof(optbuf_storage), 0); 1703 if (error) 1704 break; 1705 optlen = sopt->sopt_valsize; 1706 optbuf = optbuf_storage; 1707 optp = &in6p->in6p_outputopts; 1708 error = ip6_pcbopt(optname, optbuf, optlen, 1709 optp, uproto); 1710 break; 1711 } 1712 #undef OPTSET 1713 1714 case IPV6_MULTICAST_IF: 1715 case IPV6_MULTICAST_HOPS: 1716 case IPV6_MULTICAST_LOOP: 1717 case IPV6_JOIN_GROUP: 1718 case IPV6_LEAVE_GROUP: 1719 { 1720 struct mbuf *m; 1721 if (sopt->sopt_valsize > MLEN) { 1722 error = EMSGSIZE; 1723 break; 1724 } 1725 /* XXX */ 1726 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1727 if (m == NULL) { 1728 error = ENOBUFS; 1729 break; 1730 } 1731 m->m_len = sopt->sopt_valsize; 1732 error = soopt_to_kbuf(sopt, mtod(m, char *), 1733 m->m_len, m->m_len); 1734 error = ip6_setmoptions(sopt->sopt_name, 1735 &in6p->in6p_moptions, 1736 m); 1737 m_free(m); 1738 } 1739 break; 1740 1741 case IPV6_PORTRANGE: 1742 error = soopt_to_kbuf(sopt, &optval, 1743 sizeof optval, sizeof optval); 1744 if (error) 1745 break; 1746 1747 switch (optval) { 1748 case IPV6_PORTRANGE_DEFAULT: 1749 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1750 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1751 break; 1752 1753 case IPV6_PORTRANGE_HIGH: 1754 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1755 in6p->in6p_flags |= IN6P_HIGHPORT; 1756 break; 1757 1758 case IPV6_PORTRANGE_LOW: 1759 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1760 in6p->in6p_flags |= IN6P_LOWPORT; 1761 break; 1762 1763 default: 1764 error = EINVAL; 1765 break; 1766 } 1767 break; 1768 1769 #if defined(IPSEC) || defined(FAST_IPSEC) 1770 case IPV6_IPSEC_POLICY: 1771 { 1772 caddr_t req = NULL; 1773 size_t len = 0; 1774 struct mbuf *m; 1775 1776 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1777 break; 1778 soopt_to_mbuf(sopt, m); /* XXX */ 1779 if (m) { 1780 req = mtod(m, caddr_t); 1781 len = m->m_len; 1782 } 1783 error = ipsec6_set_policy(in6p, optname, req, 1784 len, privileged); 1785 m_freem(m); 1786 } 1787 break; 1788 #endif /* KAME IPSEC */ 1789 1790 case IPV6_FW_ADD: 1791 case IPV6_FW_DEL: 1792 case IPV6_FW_FLUSH: 1793 case IPV6_FW_ZERO: 1794 { 1795 struct mbuf *m; 1796 struct mbuf **mp = &m; 1797 1798 if (ip6_fw_ctl_ptr == NULL) 1799 return EINVAL; 1800 /* XXX */ 1801 if ((error = soopt_getm(sopt, &m)) != 0) 1802 break; 1803 /* XXX */ 1804 soopt_to_mbuf(sopt, m); 1805 error = (*ip6_fw_ctl_ptr)(optname, mp); 1806 m = *mp; 1807 } 1808 break; 1809 1810 default: 1811 error = ENOPROTOOPT; 1812 break; 1813 } 1814 break; 1815 1816 case SOPT_GET: 1817 switch (optname) { 1818 case IPV6_2292PKTOPTIONS: 1819 #ifdef IPV6_PKTOPTIONS 1820 case IPV6_PKTOPTIONS: 1821 #endif 1822 /* 1823 * RFC3542 (effectively) deprecated the 1824 * semantics of the 2292-style pktoptions. 1825 * Since it was not reliable in nature (i.e., 1826 * applications had to expect the lack of some 1827 * information after all), it would make sense 1828 * to simplify this part by always returning 1829 * empty data. 1830 */ 1831 if (in6p->in6p_options) { 1832 struct mbuf *m; 1833 m = m_copym(in6p->in6p_options, 1834 0, M_COPYALL, MB_WAIT); 1835 error = soopt_from_mbuf(sopt, m); 1836 if (error == 0) 1837 m_freem(m); 1838 } else 1839 sopt->sopt_valsize = 0; 1840 break; 1841 1842 case IPV6_RECVHOPOPTS: 1843 case IPV6_RECVDSTOPTS: 1844 case IPV6_RECVRTHDRDSTOPTS: 1845 case IPV6_UNICAST_HOPS: 1846 case IPV6_RECVPKTINFO: 1847 case IPV6_RECVHOPLIMIT: 1848 case IPV6_RECVRTHDR: 1849 case IPV6_RECVPATHMTU: 1850 case IPV6_RECVTCLASS: 1851 case IPV6_AUTOFLOWLABEL: 1852 case IPV6_FAITH: 1853 case IPV6_V6ONLY: 1854 case IPV6_PORTRANGE: 1855 switch (optname) { 1856 1857 case IPV6_RECVHOPOPTS: 1858 optval = OPTBIT(IN6P_HOPOPTS); 1859 break; 1860 1861 case IPV6_RECVDSTOPTS: 1862 optval = OPTBIT(IN6P_DSTOPTS); 1863 break; 1864 1865 case IPV6_RECVRTHDRDSTOPTS: 1866 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1867 break; 1868 1869 case IPV6_RECVPKTINFO: 1870 optval = OPTBIT(IN6P_PKTINFO); 1871 break; 1872 1873 case IPV6_RECVHOPLIMIT: 1874 optval = OPTBIT(IN6P_HOPLIMIT); 1875 break; 1876 1877 case IPV6_RECVRTHDR: 1878 optval = OPTBIT(IN6P_RTHDR); 1879 break; 1880 1881 case IPV6_RECVPATHMTU: 1882 optval = OPTBIT(IN6P_MTU); 1883 break; 1884 1885 case IPV6_RECVTCLASS: 1886 optval = OPTBIT(IN6P_TCLASS); 1887 break; 1888 1889 case IPV6_AUTOFLOWLABEL: 1890 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1891 break; 1892 1893 1894 case IPV6_UNICAST_HOPS: 1895 optval = in6p->in6p_hops; 1896 break; 1897 1898 case IPV6_FAITH: 1899 optval = OPTBIT(IN6P_FAITH); 1900 break; 1901 1902 case IPV6_V6ONLY: 1903 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1904 break; 1905 1906 case IPV6_PORTRANGE: 1907 { 1908 int flags; 1909 flags = in6p->in6p_flags; 1910 if (flags & IN6P_HIGHPORT) 1911 optval = IPV6_PORTRANGE_HIGH; 1912 else if (flags & IN6P_LOWPORT) 1913 optval = IPV6_PORTRANGE_LOW; 1914 else 1915 optval = 0; 1916 break; 1917 } 1918 } 1919 soopt_from_kbuf(sopt, &optval, 1920 sizeof optval); 1921 break; 1922 1923 case IPV6_PATHMTU: 1924 { 1925 u_long pmtu = 0; 1926 struct ip6_mtuinfo mtuinfo; 1927 struct route_in6 sro; 1928 1929 bzero(&sro, sizeof(sro)); 1930 1931 if (!(so->so_state & SS_ISCONNECTED)) 1932 return (ENOTCONN); 1933 /* 1934 * XXX: we dot not consider the case of source 1935 * routing, or optional information to specify 1936 * the outgoing interface. 1937 */ 1938 error = ip6_getpmtu(&sro, NULL, NULL, 1939 &in6p->in6p_faddr, &pmtu, NULL); 1940 if (sro.ro_rt) 1941 RTFREE(sro.ro_rt); 1942 if (error) 1943 break; 1944 if (pmtu > IPV6_MAXPACKET) 1945 pmtu = IPV6_MAXPACKET; 1946 1947 bzero(&mtuinfo, sizeof(mtuinfo)); 1948 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1949 optdata = (void *)&mtuinfo; 1950 optdatalen = sizeof(mtuinfo); 1951 soopt_from_kbuf(sopt, optdata, 1952 optdatalen); 1953 break; 1954 } 1955 1956 case IPV6_2292PKTINFO: 1957 case IPV6_2292HOPLIMIT: 1958 case IPV6_2292HOPOPTS: 1959 case IPV6_2292RTHDR: 1960 case IPV6_2292DSTOPTS: 1961 if (optname == IPV6_2292HOPOPTS || 1962 optname == IPV6_2292DSTOPTS || 1963 !privileged) 1964 return (EPERM); 1965 switch (optname) { 1966 case IPV6_2292PKTINFO: 1967 optval = OPTBIT(IN6P_PKTINFO); 1968 break; 1969 case IPV6_2292HOPLIMIT: 1970 optval = OPTBIT(IN6P_HOPLIMIT); 1971 break; 1972 case IPV6_2292HOPOPTS: 1973 if (!privileged) 1974 return (EPERM); 1975 optval = OPTBIT(IN6P_HOPOPTS); 1976 break; 1977 case IPV6_2292RTHDR: 1978 optval = OPTBIT(IN6P_RTHDR); 1979 break; 1980 case IPV6_2292DSTOPTS: 1981 if (!privileged) 1982 return (EPERM); 1983 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1984 break; 1985 } 1986 soopt_from_kbuf(sopt, &optval, 1987 sizeof optval); 1988 break; 1989 1990 case IPV6_PKTINFO: 1991 case IPV6_HOPOPTS: 1992 case IPV6_RTHDR: 1993 case IPV6_DSTOPTS: 1994 case IPV6_RTHDRDSTOPTS: 1995 case IPV6_NEXTHOP: 1996 case IPV6_TCLASS: 1997 case IPV6_DONTFRAG: 1998 case IPV6_USE_MIN_MTU: 1999 case IPV6_PREFER_TEMPADDR: 2000 error = ip6_getpcbopt(in6p->in6p_outputopts, 2001 optname, sopt); 2002 break; 2003 2004 case IPV6_MULTICAST_IF: 2005 case IPV6_MULTICAST_HOPS: 2006 case IPV6_MULTICAST_LOOP: 2007 case IPV6_JOIN_GROUP: 2008 case IPV6_LEAVE_GROUP: 2009 { 2010 struct mbuf *m; 2011 error = ip6_getmoptions(sopt->sopt_name, 2012 in6p->in6p_moptions, &m); 2013 if (error == 0) 2014 soopt_from_kbuf(sopt, 2015 mtod(m, char *), m->m_len); 2016 m_freem(m); 2017 } 2018 break; 2019 2020 #if defined(IPSEC) || defined(FAST_IPSEC) 2021 case IPV6_IPSEC_POLICY: 2022 { 2023 caddr_t req = NULL; 2024 size_t len = 0; 2025 struct mbuf *m = NULL; 2026 struct mbuf **mp = &m; 2027 2028 error = soopt_getm(sopt, &m); /* XXX */ 2029 if (error != 0) 2030 break; 2031 soopt_to_mbuf(sopt, m); /* XXX */ 2032 if (m) { 2033 req = mtod(m, caddr_t); 2034 len = m->m_len; 2035 } 2036 error = ipsec6_get_policy(in6p, req, len, mp); 2037 if (error == 0) 2038 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2039 if (error == 0 && m != NULL) 2040 m_freem(m); 2041 break; 2042 } 2043 #endif /* KAME IPSEC */ 2044 2045 case IPV6_FW_GET: 2046 { 2047 struct mbuf *m; 2048 struct mbuf **mp = &m; 2049 2050 if (ip6_fw_ctl_ptr == NULL) 2051 { 2052 return EINVAL; 2053 } 2054 error = (*ip6_fw_ctl_ptr)(optname, mp); 2055 if (error == 0) 2056 error = soopt_from_mbuf(sopt, m); /* XXX */ 2057 if (error == 0 && m != NULL) 2058 m_freem(m); 2059 } 2060 break; 2061 2062 default: 2063 error = ENOPROTOOPT; 2064 break; 2065 } 2066 break; 2067 } 2068 } else { 2069 error = EINVAL; 2070 } 2071 return (error); 2072 } 2073 2074 int 2075 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2076 { 2077 int error = 0, optval, optlen; 2078 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2079 struct in6pcb *in6p = sotoin6pcb(so); 2080 int level, op, optname; 2081 2082 if (sopt) { 2083 level = sopt->sopt_level; 2084 op = sopt->sopt_dir; 2085 optname = sopt->sopt_name; 2086 optlen = sopt->sopt_valsize; 2087 } else 2088 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2089 2090 if (level != IPPROTO_IPV6) { 2091 return (EINVAL); 2092 } 2093 2094 switch (optname) { 2095 case IPV6_CHECKSUM: 2096 /* 2097 * For ICMPv6 sockets, no modification allowed for checksum 2098 * offset, permit "no change" values to help existing apps. 2099 * 2100 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2101 * for an ICMPv6 socket will fail." 2102 * The current behavior does not meet RFC3542. 2103 */ 2104 switch (op) { 2105 case SOPT_SET: 2106 if (optlen != sizeof(int)) { 2107 error = EINVAL; 2108 break; 2109 } 2110 error = soopt_to_kbuf(sopt, &optval, 2111 sizeof optval, sizeof optval); 2112 if (error) 2113 break; 2114 if ((optval % 2) != 0) { 2115 /* the API assumes even offset values */ 2116 error = EINVAL; 2117 } else if (so->so_proto->pr_protocol == 2118 IPPROTO_ICMPV6) { 2119 if (optval != icmp6off) 2120 error = EINVAL; 2121 } else 2122 in6p->in6p_cksum = optval; 2123 break; 2124 2125 case SOPT_GET: 2126 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2127 optval = icmp6off; 2128 else 2129 optval = in6p->in6p_cksum; 2130 2131 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2132 break; 2133 2134 default: 2135 error = EINVAL; 2136 break; 2137 } 2138 break; 2139 2140 default: 2141 error = ENOPROTOOPT; 2142 break; 2143 } 2144 2145 return (error); 2146 } 2147 2148 /* 2149 * Set up IP6 options in pcb for insertion in output packets or 2150 * specifying behavior of outgoing packets. 2151 */ 2152 static int 2153 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2154 struct socket *so, struct sockopt *sopt) 2155 { 2156 int priv = 0; 2157 struct ip6_pktopts *opt = *pktopt; 2158 int error = 0; 2159 2160 /* turn off any old options. */ 2161 if (opt) { 2162 #ifdef DIAGNOSTIC 2163 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2164 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2165 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2166 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2167 #endif 2168 ip6_clearpktopts(opt, -1); 2169 } else 2170 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2171 *pktopt = NULL; 2172 2173 if (!m || m->m_len == 0) { 2174 /* 2175 * Only turning off any previous options, regardless of 2176 * whether the opt is just created or given. 2177 */ 2178 kfree(opt, M_IP6OPT); 2179 return (0); 2180 } 2181 2182 /* set options specified by user. */ 2183 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2184 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2185 kfree(opt, M_IP6OPT); 2186 return (error); 2187 } 2188 *pktopt = opt; 2189 return (0); 2190 } 2191 2192 2193 /* 2194 * Below three functions are introduced by merge to RFC3542 2195 */ 2196 2197 static int 2198 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2199 { 2200 void *optdata = NULL; 2201 int optdatalen = 0; 2202 struct ip6_ext *ip6e; 2203 int error = 0; 2204 struct in6_pktinfo null_pktinfo; 2205 int deftclass = 0, on; 2206 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2207 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2208 2209 switch (optname) { 2210 case IPV6_PKTINFO: 2211 if (pktopt && pktopt->ip6po_pktinfo) 2212 optdata = (void *)pktopt->ip6po_pktinfo; 2213 else { 2214 /* XXX: we don't have to do this every time... */ 2215 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2216 optdata = (void *)&null_pktinfo; 2217 } 2218 optdatalen = sizeof(struct in6_pktinfo); 2219 break; 2220 case IPV6_TCLASS: 2221 if (pktopt && pktopt->ip6po_tclass >= 0) 2222 optdata = (void *)&pktopt->ip6po_tclass; 2223 else 2224 optdata = (void *)&deftclass; 2225 optdatalen = sizeof(int); 2226 break; 2227 case IPV6_HOPOPTS: 2228 if (pktopt && pktopt->ip6po_hbh) { 2229 optdata = (void *)pktopt->ip6po_hbh; 2230 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2231 optdatalen = (ip6e->ip6e_len + 1) << 3; 2232 } 2233 break; 2234 case IPV6_RTHDR: 2235 if (pktopt && pktopt->ip6po_rthdr) { 2236 optdata = (void *)pktopt->ip6po_rthdr; 2237 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2238 optdatalen = (ip6e->ip6e_len + 1) << 3; 2239 } 2240 break; 2241 case IPV6_RTHDRDSTOPTS: 2242 if (pktopt && pktopt->ip6po_dest1) { 2243 optdata = (void *)pktopt->ip6po_dest1; 2244 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2245 optdatalen = (ip6e->ip6e_len + 1) << 3; 2246 } 2247 break; 2248 case IPV6_DSTOPTS: 2249 if (pktopt && pktopt->ip6po_dest2) { 2250 optdata = (void *)pktopt->ip6po_dest2; 2251 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2252 optdatalen = (ip6e->ip6e_len + 1) << 3; 2253 } 2254 break; 2255 case IPV6_NEXTHOP: 2256 if (pktopt && pktopt->ip6po_nexthop) { 2257 optdata = (void *)pktopt->ip6po_nexthop; 2258 optdatalen = pktopt->ip6po_nexthop->sa_len; 2259 } 2260 break; 2261 case IPV6_USE_MIN_MTU: 2262 if (pktopt) 2263 optdata = (void *)&pktopt->ip6po_minmtu; 2264 else 2265 optdata = (void *)&defminmtu; 2266 optdatalen = sizeof(int); 2267 break; 2268 case IPV6_DONTFRAG: 2269 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2270 on = 1; 2271 else 2272 on = 0; 2273 optdata = (void *)&on; 2274 optdatalen = sizeof(on); 2275 break; 2276 case IPV6_PREFER_TEMPADDR: 2277 if (pktopt) 2278 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2279 else 2280 optdata = (void *)&defpreftemp; 2281 optdatalen = sizeof(int); 2282 break; 2283 default: /* should not happen */ 2284 #ifdef DIAGNOSTIC 2285 panic("ip6_getpcbopt: unexpected option\n"); 2286 #endif 2287 return (ENOPROTOOPT); 2288 } 2289 2290 soopt_from_kbuf(sopt, optdata, optdatalen); 2291 2292 return (error); 2293 } 2294 2295 /* 2296 * initialize ip6_pktopts. beware that there are non-zero default values in 2297 * the struct. 2298 */ 2299 2300 static int 2301 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2302 { 2303 struct ip6_pktopts *opt; 2304 int priv =0; 2305 if (*pktopt == NULL) { 2306 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2307 init_ip6pktopts(*pktopt); 2308 } 2309 opt = *pktopt; 2310 2311 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2312 } 2313 2314 /* 2315 * initialize ip6_pktopts. beware that there are non-zero default values in 2316 * the struct. 2317 */ 2318 void 2319 init_ip6pktopts(struct ip6_pktopts *opt) 2320 { 2321 2322 bzero(opt, sizeof(*opt)); 2323 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2324 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2325 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2326 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2327 } 2328 2329 void 2330 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2331 { 2332 if (pktopt == NULL) 2333 return; 2334 2335 if (optname == -1 || optname == IPV6_PKTINFO) { 2336 if (pktopt->ip6po_pktinfo) 2337 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2338 pktopt->ip6po_pktinfo = NULL; 2339 } 2340 if (optname == -1 || optname == IPV6_HOPLIMIT) 2341 pktopt->ip6po_hlim = -1; 2342 if (optname == -1 || optname == IPV6_TCLASS) 2343 pktopt->ip6po_tclass = -1; 2344 if (optname == -1 || optname == IPV6_NEXTHOP) { 2345 if (pktopt->ip6po_nextroute.ro_rt) { 2346 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2347 pktopt->ip6po_nextroute.ro_rt = NULL; 2348 } 2349 if (pktopt->ip6po_nexthop) 2350 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2351 pktopt->ip6po_nexthop = NULL; 2352 } 2353 if (optname == -1 || optname == IPV6_HOPOPTS) { 2354 if (pktopt->ip6po_hbh) 2355 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2356 pktopt->ip6po_hbh = NULL; 2357 } 2358 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2359 if (pktopt->ip6po_dest1) 2360 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2361 pktopt->ip6po_dest1 = NULL; 2362 } 2363 if (optname == -1 || optname == IPV6_RTHDR) { 2364 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2365 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2366 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2367 if (pktopt->ip6po_route.ro_rt) { 2368 RTFREE(pktopt->ip6po_route.ro_rt); 2369 pktopt->ip6po_route.ro_rt = NULL; 2370 } 2371 } 2372 if (optname == -1 || optname == IPV6_DSTOPTS) { 2373 if (pktopt->ip6po_dest2) 2374 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2375 pktopt->ip6po_dest2 = NULL; 2376 } 2377 } 2378 2379 #define PKTOPT_EXTHDRCPY(type) \ 2380 do {\ 2381 if (src->type) {\ 2382 int hlen =\ 2383 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2384 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2385 if (dst->type == NULL)\ 2386 goto bad;\ 2387 bcopy(src->type, dst->type, hlen);\ 2388 }\ 2389 } while (0) 2390 2391 struct ip6_pktopts * 2392 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2393 { 2394 struct ip6_pktopts *dst; 2395 2396 if (src == NULL) { 2397 kprintf("ip6_clearpktopts: invalid argument\n"); 2398 return (NULL); 2399 } 2400 2401 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2402 if (dst == NULL) 2403 return (NULL); 2404 2405 dst->ip6po_hlim = src->ip6po_hlim; 2406 if (src->ip6po_pktinfo) { 2407 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2408 M_IP6OPT, canwait); 2409 if (dst->ip6po_pktinfo == NULL) 2410 goto bad; 2411 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2412 } 2413 if (src->ip6po_nexthop) { 2414 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2415 M_IP6OPT, canwait); 2416 if (dst->ip6po_nexthop == NULL) 2417 goto bad; 2418 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2419 src->ip6po_nexthop->sa_len); 2420 } 2421 PKTOPT_EXTHDRCPY(ip6po_hbh); 2422 PKTOPT_EXTHDRCPY(ip6po_dest1); 2423 PKTOPT_EXTHDRCPY(ip6po_dest2); 2424 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2425 return (dst); 2426 2427 bad: 2428 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2429 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2430 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2431 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2432 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2433 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2434 kfree(dst, M_IP6OPT); 2435 return (NULL); 2436 } 2437 2438 static int 2439 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2440 { 2441 if (dst == NULL || src == NULL) { 2442 #ifdef DIAGNOSTIC 2443 kprintf("ip6_clearpktopts: invalid argument\n"); 2444 #endif 2445 return (EINVAL); 2446 } 2447 2448 dst->ip6po_hlim = src->ip6po_hlim; 2449 dst->ip6po_tclass = src->ip6po_tclass; 2450 dst->ip6po_flags = src->ip6po_flags; 2451 if (src->ip6po_pktinfo) { 2452 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2453 M_IP6OPT, canwait); 2454 if (dst->ip6po_pktinfo == NULL) 2455 goto bad; 2456 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2457 } 2458 if (src->ip6po_nexthop) { 2459 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2460 M_IP6OPT, canwait); 2461 if (dst->ip6po_nexthop == NULL) 2462 goto bad; 2463 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2464 src->ip6po_nexthop->sa_len); 2465 } 2466 PKTOPT_EXTHDRCPY(ip6po_hbh); 2467 PKTOPT_EXTHDRCPY(ip6po_dest1); 2468 PKTOPT_EXTHDRCPY(ip6po_dest2); 2469 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2470 return (0); 2471 2472 bad: 2473 ip6_clearpktopts(dst, -1); 2474 return (ENOBUFS); 2475 } 2476 #undef PKTOPT_EXTHDRCPY 2477 2478 void 2479 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2480 { 2481 if (pktopt == NULL) 2482 return; 2483 2484 ip6_clearpktopts(pktopt, -1); 2485 2486 kfree(pktopt, M_IP6OPT); 2487 } 2488 2489 /* 2490 * Set the IP6 multicast options in response to user setsockopt(). 2491 */ 2492 static int 2493 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2494 { 2495 int error = 0; 2496 u_int loop, ifindex; 2497 struct ipv6_mreq *mreq; 2498 struct ifnet *ifp; 2499 struct ip6_moptions *im6o = *im6op; 2500 struct route_in6 ro; 2501 struct sockaddr_in6 *dst; 2502 struct in6_multi_mship *imm; 2503 struct thread *td = curthread; /* XXX */ 2504 2505 if (im6o == NULL) { 2506 /* 2507 * No multicast option buffer attached to the pcb; 2508 * allocate one and initialize to default values. 2509 */ 2510 im6o = (struct ip6_moptions *) 2511 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2512 2513 *im6op = im6o; 2514 im6o->im6o_multicast_ifp = NULL; 2515 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2516 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2517 LIST_INIT(&im6o->im6o_memberships); 2518 } 2519 2520 switch (optname) { 2521 2522 case IPV6_MULTICAST_IF: 2523 /* 2524 * Select the interface for outgoing multicast packets. 2525 */ 2526 if (m == NULL || m->m_len != sizeof(u_int)) { 2527 error = EINVAL; 2528 break; 2529 } 2530 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2531 if (ifindex < 0 || if_index < ifindex) { 2532 error = ENXIO; /* XXX EINVAL? */ 2533 break; 2534 } 2535 ifp = ifindex2ifnet[ifindex]; 2536 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2537 error = EADDRNOTAVAIL; 2538 break; 2539 } 2540 im6o->im6o_multicast_ifp = ifp; 2541 break; 2542 2543 case IPV6_MULTICAST_HOPS: 2544 { 2545 /* 2546 * Set the IP6 hoplimit for outgoing multicast packets. 2547 */ 2548 int optval; 2549 if (m == NULL || m->m_len != sizeof(int)) { 2550 error = EINVAL; 2551 break; 2552 } 2553 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2554 if (optval < -1 || optval >= 256) 2555 error = EINVAL; 2556 else if (optval == -1) 2557 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2558 else 2559 im6o->im6o_multicast_hlim = optval; 2560 break; 2561 } 2562 2563 case IPV6_MULTICAST_LOOP: 2564 /* 2565 * Set the loopback flag for outgoing multicast packets. 2566 * Must be zero or one. 2567 */ 2568 if (m == NULL || m->m_len != sizeof(u_int)) { 2569 error = EINVAL; 2570 break; 2571 } 2572 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2573 if (loop > 1) { 2574 error = EINVAL; 2575 break; 2576 } 2577 im6o->im6o_multicast_loop = loop; 2578 break; 2579 2580 case IPV6_JOIN_GROUP: 2581 /* 2582 * Add a multicast group membership. 2583 * Group must be a valid IP6 multicast address. 2584 */ 2585 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2586 error = EINVAL; 2587 break; 2588 } 2589 mreq = mtod(m, struct ipv6_mreq *); 2590 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2591 /* 2592 * We use the unspecified address to specify to accept 2593 * all multicast addresses. Only super user is allowed 2594 * to do this. 2595 */ 2596 if (priv_check(td, PRIV_ROOT)) 2597 { 2598 error = EACCES; 2599 break; 2600 } 2601 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2602 error = EINVAL; 2603 break; 2604 } 2605 2606 /* 2607 * If the interface is specified, validate it. 2608 */ 2609 if (mreq->ipv6mr_interface < 0 2610 || if_index < mreq->ipv6mr_interface) { 2611 error = ENXIO; /* XXX EINVAL? */ 2612 break; 2613 } 2614 /* 2615 * If no interface was explicitly specified, choose an 2616 * appropriate one according to the given multicast address. 2617 */ 2618 if (mreq->ipv6mr_interface == 0) { 2619 /* 2620 * If the multicast address is in node-local scope, 2621 * the interface should be a loopback interface. 2622 * Otherwise, look up the routing table for the 2623 * address, and choose the outgoing interface. 2624 * XXX: is it a good approach? 2625 */ 2626 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2627 ifp = &loif[0]; 2628 } else { 2629 ro.ro_rt = NULL; 2630 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2631 bzero(dst, sizeof(*dst)); 2632 dst->sin6_len = sizeof(struct sockaddr_in6); 2633 dst->sin6_family = AF_INET6; 2634 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2635 rtalloc((struct route *)&ro); 2636 if (ro.ro_rt == NULL) { 2637 error = EADDRNOTAVAIL; 2638 break; 2639 } 2640 ifp = ro.ro_rt->rt_ifp; 2641 rtfree(ro.ro_rt); 2642 } 2643 } else 2644 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2645 2646 /* 2647 * See if we found an interface, and confirm that it 2648 * supports multicast 2649 */ 2650 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2651 error = EADDRNOTAVAIL; 2652 break; 2653 } 2654 /* 2655 * Put interface index into the multicast address, 2656 * if the address has link-local scope. 2657 */ 2658 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2659 mreq->ipv6mr_multiaddr.s6_addr16[1] 2660 = htons(mreq->ipv6mr_interface); 2661 } 2662 /* 2663 * See if the membership already exists. 2664 */ 2665 for (imm = im6o->im6o_memberships.lh_first; 2666 imm != NULL; imm = imm->i6mm_chain.le_next) 2667 if (imm->i6mm_maddr->in6m_ifp == ifp && 2668 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2669 &mreq->ipv6mr_multiaddr)) 2670 break; 2671 if (imm != NULL) { 2672 error = EADDRINUSE; 2673 break; 2674 } 2675 /* 2676 * Everything looks good; add a new record to the multicast 2677 * address list for the given interface. 2678 */ 2679 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2680 if ((imm->i6mm_maddr = 2681 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2682 kfree(imm, M_IPMADDR); 2683 break; 2684 } 2685 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2686 break; 2687 2688 case IPV6_LEAVE_GROUP: 2689 /* 2690 * Drop a multicast group membership. 2691 * Group must be a valid IP6 multicast address. 2692 */ 2693 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2694 error = EINVAL; 2695 break; 2696 } 2697 mreq = mtod(m, struct ipv6_mreq *); 2698 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2699 if (priv_check(td, PRIV_ROOT)) { 2700 error = EACCES; 2701 break; 2702 } 2703 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2704 error = EINVAL; 2705 break; 2706 } 2707 /* 2708 * If an interface address was specified, get a pointer 2709 * to its ifnet structure. 2710 */ 2711 if (mreq->ipv6mr_interface < 0 2712 || if_index < mreq->ipv6mr_interface) { 2713 error = ENXIO; /* XXX EINVAL? */ 2714 break; 2715 } 2716 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2717 /* 2718 * Put interface index into the multicast address, 2719 * if the address has link-local scope. 2720 */ 2721 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2722 mreq->ipv6mr_multiaddr.s6_addr16[1] 2723 = htons(mreq->ipv6mr_interface); 2724 } 2725 /* 2726 * Find the membership in the membership list. 2727 */ 2728 for (imm = im6o->im6o_memberships.lh_first; 2729 imm != NULL; imm = imm->i6mm_chain.le_next) { 2730 if ((ifp == NULL || 2731 imm->i6mm_maddr->in6m_ifp == ifp) && 2732 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2733 &mreq->ipv6mr_multiaddr)) 2734 break; 2735 } 2736 if (imm == NULL) { 2737 /* Unable to resolve interface */ 2738 error = EADDRNOTAVAIL; 2739 break; 2740 } 2741 /* 2742 * Give up the multicast address record to which the 2743 * membership points. 2744 */ 2745 LIST_REMOVE(imm, i6mm_chain); 2746 in6_delmulti(imm->i6mm_maddr); 2747 kfree(imm, M_IPMADDR); 2748 break; 2749 2750 default: 2751 error = EOPNOTSUPP; 2752 break; 2753 } 2754 2755 /* 2756 * If all options have default values, no need to keep the mbuf. 2757 */ 2758 if (im6o->im6o_multicast_ifp == NULL && 2759 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2760 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2761 im6o->im6o_memberships.lh_first == NULL) { 2762 kfree(*im6op, M_IPMOPTS); 2763 *im6op = NULL; 2764 } 2765 2766 return (error); 2767 } 2768 2769 /* 2770 * Return the IP6 multicast options in response to user getsockopt(). 2771 */ 2772 static int 2773 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2774 { 2775 u_int *hlim, *loop, *ifindex; 2776 2777 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2778 2779 switch (optname) { 2780 2781 case IPV6_MULTICAST_IF: 2782 ifindex = mtod(*mp, u_int *); 2783 (*mp)->m_len = sizeof(u_int); 2784 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2785 *ifindex = 0; 2786 else 2787 *ifindex = im6o->im6o_multicast_ifp->if_index; 2788 return (0); 2789 2790 case IPV6_MULTICAST_HOPS: 2791 hlim = mtod(*mp, u_int *); 2792 (*mp)->m_len = sizeof(u_int); 2793 if (im6o == NULL) 2794 *hlim = ip6_defmcasthlim; 2795 else 2796 *hlim = im6o->im6o_multicast_hlim; 2797 return (0); 2798 2799 case IPV6_MULTICAST_LOOP: 2800 loop = mtod(*mp, u_int *); 2801 (*mp)->m_len = sizeof(u_int); 2802 if (im6o == NULL) 2803 *loop = ip6_defmcasthlim; 2804 else 2805 *loop = im6o->im6o_multicast_loop; 2806 return (0); 2807 2808 default: 2809 return (EOPNOTSUPP); 2810 } 2811 } 2812 2813 /* 2814 * Discard the IP6 multicast options. 2815 */ 2816 void 2817 ip6_freemoptions(struct ip6_moptions *im6o) 2818 { 2819 struct in6_multi_mship *imm; 2820 2821 if (im6o == NULL) 2822 return; 2823 2824 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2825 LIST_REMOVE(imm, i6mm_chain); 2826 if (imm->i6mm_maddr) 2827 in6_delmulti(imm->i6mm_maddr); 2828 kfree(imm, M_IPMADDR); 2829 } 2830 kfree(im6o, M_IPMOPTS); 2831 } 2832 2833 /* 2834 * Set a particular packet option, as a sticky option or an ancillary data 2835 * item. "len" can be 0 only when it's a sticky option. 2836 * We have 4 cases of combination of "sticky" and "cmsg": 2837 * "sticky=0, cmsg=0": impossible 2838 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2839 * "sticky=1, cmsg=0": RFC3542 socket option 2840 * "sticky=1, cmsg=1": RFC2292 socket option 2841 */ 2842 static int 2843 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2844 int sticky, int cmsg, int uproto, int priv) 2845 { 2846 int minmtupolicy, preftemp; 2847 //int error; 2848 2849 if (!sticky && !cmsg) { 2850 kprintf("ip6_setpktoption: impossible case\n"); 2851 return (EINVAL); 2852 } 2853 2854 /* 2855 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2856 * not be specified in the context of RFC3542. Conversely, 2857 * RFC3542 types should not be specified in the context of RFC2292. 2858 */ 2859 if (!cmsg) { 2860 switch (optname) { 2861 case IPV6_2292PKTINFO: 2862 case IPV6_2292HOPLIMIT: 2863 case IPV6_2292NEXTHOP: 2864 case IPV6_2292HOPOPTS: 2865 case IPV6_2292DSTOPTS: 2866 case IPV6_2292RTHDR: 2867 case IPV6_2292PKTOPTIONS: 2868 return (ENOPROTOOPT); 2869 } 2870 } 2871 if (sticky && cmsg) { 2872 switch (optname) { 2873 case IPV6_PKTINFO: 2874 case IPV6_HOPLIMIT: 2875 case IPV6_NEXTHOP: 2876 case IPV6_HOPOPTS: 2877 case IPV6_DSTOPTS: 2878 case IPV6_RTHDRDSTOPTS: 2879 case IPV6_RTHDR: 2880 case IPV6_USE_MIN_MTU: 2881 case IPV6_DONTFRAG: 2882 case IPV6_TCLASS: 2883 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2884 return (ENOPROTOOPT); 2885 } 2886 } 2887 2888 switch (optname) { 2889 case IPV6_2292PKTINFO: 2890 case IPV6_PKTINFO: 2891 { 2892 struct in6_pktinfo *pktinfo; 2893 if (len != sizeof(struct in6_pktinfo)) 2894 return (EINVAL); 2895 pktinfo = (struct in6_pktinfo *)buf; 2896 2897 /* 2898 * An application can clear any sticky IPV6_PKTINFO option by 2899 * doing a "regular" setsockopt with ipi6_addr being 2900 * in6addr_any and ipi6_ifindex being zero. 2901 * [RFC 3542, Section 6] 2902 */ 2903 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2904 pktinfo->ipi6_ifindex == 0 && 2905 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2906 ip6_clearpktopts(opt, optname); 2907 break; 2908 } 2909 2910 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2911 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2912 return (EINVAL); 2913 } 2914 2915 /* validate the interface index if specified. */ 2916 if (pktinfo->ipi6_ifindex > if_index || 2917 pktinfo->ipi6_ifindex < 0) { 2918 return (ENXIO); 2919 } 2920 /* 2921 * Check if the requested source address is indeed a 2922 * unicast address assigned to the node, and can be 2923 * used as the packet's source address. 2924 */ 2925 if (opt->ip6po_pktinfo != NULL && 2926 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2927 struct in6_ifaddr *ia6; 2928 struct sockaddr_in6 sin6; 2929 2930 bzero(&sin6, sizeof(sin6)); 2931 sin6.sin6_len = sizeof(sin6); 2932 sin6.sin6_family = AF_INET6; 2933 sin6.sin6_addr = 2934 opt->ip6po_pktinfo->ipi6_addr; 2935 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2936 if (ia6 == NULL || 2937 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2938 IN6_IFF_NOTREADY)) != 0) 2939 return (EADDRNOTAVAIL); 2940 } 2941 2942 /* 2943 * We store the address anyway, and let in6_selectsrc() 2944 * validate the specified address. This is because ipi6_addr 2945 * may not have enough information about its scope zone, and 2946 * we may need additional information (such as outgoing 2947 * interface or the scope zone of a destination address) to 2948 * disambiguate the scope. 2949 * XXX: the delay of the validation may confuse the 2950 * application when it is used as a sticky option. 2951 */ 2952 if (opt->ip6po_pktinfo == NULL) { 2953 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2954 M_IP6OPT, M_NOWAIT); 2955 if (opt->ip6po_pktinfo == NULL) 2956 return (ENOBUFS); 2957 } 2958 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2959 break; 2960 } 2961 2962 case IPV6_2292HOPLIMIT: 2963 case IPV6_HOPLIMIT: 2964 { 2965 int *hlimp; 2966 2967 /* 2968 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2969 * to simplify the ordering among hoplimit options. 2970 */ 2971 if (optname == IPV6_HOPLIMIT && sticky) 2972 return (ENOPROTOOPT); 2973 2974 if (len != sizeof(int)) 2975 return (EINVAL); 2976 hlimp = (int *)buf; 2977 if (*hlimp < -1 || *hlimp > 255) 2978 return (EINVAL); 2979 2980 opt->ip6po_hlim = *hlimp; 2981 break; 2982 } 2983 2984 case IPV6_TCLASS: 2985 { 2986 int tclass; 2987 2988 if (len != sizeof(int)) 2989 return (EINVAL); 2990 tclass = *(int *)buf; 2991 if (tclass < -1 || tclass > 255) 2992 return (EINVAL); 2993 2994 opt->ip6po_tclass = tclass; 2995 break; 2996 } 2997 2998 case IPV6_2292NEXTHOP: 2999 case IPV6_NEXTHOP: 3000 if (!priv) 3001 return (EPERM); 3002 3003 if (len == 0) { /* just remove the option */ 3004 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3005 break; 3006 } 3007 3008 /* check if cmsg_len is large enough for sa_len */ 3009 if (len < sizeof(struct sockaddr) || len < *buf) 3010 return (EINVAL); 3011 3012 switch (((struct sockaddr *)buf)->sa_family) { 3013 case AF_INET6: 3014 { 3015 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3016 //int error; 3017 3018 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3019 return (EINVAL); 3020 3021 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3022 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3023 return (EINVAL); 3024 } 3025 break; 3026 } 3027 case AF_LINK: /* should eventually be supported */ 3028 default: 3029 return (EAFNOSUPPORT); 3030 } 3031 3032 /* turn off the previous option, then set the new option. */ 3033 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3034 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3035 if (opt->ip6po_nexthop == NULL) 3036 return (ENOBUFS); 3037 bcopy(buf, opt->ip6po_nexthop, *buf); 3038 break; 3039 3040 case IPV6_2292HOPOPTS: 3041 case IPV6_HOPOPTS: 3042 { 3043 struct ip6_hbh *hbh; 3044 int hbhlen; 3045 3046 /* 3047 * XXX: We don't allow a non-privileged user to set ANY HbH 3048 * options, since per-option restriction has too much 3049 * overhead. 3050 */ 3051 if (!priv) 3052 return (EPERM); 3053 if (len == 0) { 3054 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3055 break; /* just remove the option */ 3056 } 3057 3058 /* message length validation */ 3059 if (len < sizeof(struct ip6_hbh)) 3060 return (EINVAL); 3061 hbh = (struct ip6_hbh *)buf; 3062 hbhlen = (hbh->ip6h_len + 1) << 3; 3063 if (len != hbhlen) 3064 return (EINVAL); 3065 3066 /* turn off the previous option, then set the new option. */ 3067 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3068 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3069 if (opt->ip6po_hbh == NULL) 3070 return (ENOBUFS); 3071 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3072 3073 break; 3074 } 3075 3076 case IPV6_2292DSTOPTS: 3077 case IPV6_DSTOPTS: 3078 case IPV6_RTHDRDSTOPTS: 3079 { 3080 struct ip6_dest *dest, **newdest = NULL; 3081 int destlen; 3082 if (!priv) 3083 return (EPERM); 3084 3085 if (len == 0) { 3086 ip6_clearpktopts(opt, optname); 3087 break; /* just remove the option */ 3088 } 3089 3090 /* message length validation */ 3091 if (len < sizeof(struct ip6_dest)) 3092 return (EINVAL); 3093 dest = (struct ip6_dest *)buf; 3094 destlen = (dest->ip6d_len + 1) << 3; 3095 if (len != destlen) 3096 return (EINVAL); 3097 3098 /* 3099 * Determine the position that the destination options header 3100 * should be inserted; before or after the routing header. 3101 */ 3102 switch (optname) { 3103 case IPV6_2292DSTOPTS: 3104 /* 3105 * The old advacned API is ambiguous on this point. 3106 * Our approach is to determine the position based 3107 * according to the existence of a routing header. 3108 * Note, however, that this depends on the order of the 3109 * extension headers in the ancillary data; the 1st 3110 * part of the destination options header must appear 3111 * before the routing header in the ancillary data, 3112 * too. 3113 * RFC3542 solved the ambiguity by introducing 3114 * separate ancillary data or option types. 3115 */ 3116 if (opt->ip6po_rthdr == NULL) 3117 newdest = &opt->ip6po_dest1; 3118 else 3119 newdest = &opt->ip6po_dest2; 3120 break; 3121 case IPV6_RTHDRDSTOPTS: 3122 newdest = &opt->ip6po_dest1; 3123 break; 3124 case IPV6_DSTOPTS: 3125 newdest = &opt->ip6po_dest2; 3126 break; 3127 } 3128 3129 /* turn off the previous option, then set the new option. */ 3130 ip6_clearpktopts(opt, optname); 3131 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3132 if (*newdest == NULL) 3133 return (ENOBUFS); 3134 bcopy(dest, *newdest, destlen); 3135 3136 break; 3137 } 3138 3139 case IPV6_2292RTHDR: 3140 case IPV6_RTHDR: 3141 { 3142 struct ip6_rthdr *rth; 3143 int rthlen; 3144 3145 if (len == 0) { 3146 ip6_clearpktopts(opt, IPV6_RTHDR); 3147 break; /* just remove the option */ 3148 } 3149 3150 /* message length validation */ 3151 if (len < sizeof(struct ip6_rthdr)) 3152 return (EINVAL); 3153 rth = (struct ip6_rthdr *)buf; 3154 rthlen = (rth->ip6r_len + 1) << 3; 3155 if (len != rthlen) 3156 return (EINVAL); 3157 3158 switch (rth->ip6r_type) { 3159 default: 3160 return (EINVAL); /* not supported */ 3161 } 3162 3163 /* turn off the previous option */ 3164 ip6_clearpktopts(opt, IPV6_RTHDR); 3165 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3166 if (opt->ip6po_rthdr == NULL) 3167 return (ENOBUFS); 3168 bcopy(rth, opt->ip6po_rthdr, rthlen); 3169 3170 break; 3171 } 3172 3173 case IPV6_USE_MIN_MTU: 3174 if (len != sizeof(int)) 3175 return (EINVAL); 3176 minmtupolicy = *(int *)buf; 3177 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3178 minmtupolicy != IP6PO_MINMTU_DISABLE && 3179 minmtupolicy != IP6PO_MINMTU_ALL) { 3180 return (EINVAL); 3181 } 3182 opt->ip6po_minmtu = minmtupolicy; 3183 break; 3184 3185 case IPV6_DONTFRAG: 3186 if (len != sizeof(int)) 3187 return (EINVAL); 3188 3189 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3190 /* 3191 * we ignore this option for TCP sockets. 3192 * (RFC3542 leaves this case unspecified.) 3193 */ 3194 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3195 } else 3196 opt->ip6po_flags |= IP6PO_DONTFRAG; 3197 break; 3198 3199 case IPV6_PREFER_TEMPADDR: 3200 if (len != sizeof(int)) 3201 return (EINVAL); 3202 preftemp = *(int *)buf; 3203 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3204 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3205 preftemp != IP6PO_TEMPADDR_PREFER) { 3206 return (EINVAL); 3207 } 3208 opt->ip6po_prefer_tempaddr = preftemp; 3209 break; 3210 3211 default: 3212 return (ENOPROTOOPT); 3213 } /* end of switch */ 3214 3215 return (0); 3216 } 3217 3218 3219 /* 3220 * Set IPv6 outgoing packet options based on advanced API. 3221 */ 3222 int 3223 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3224 struct ip6_pktopts *stickyopt, int uproto, int priv) 3225 { 3226 struct cmsghdr *cm = NULL; 3227 3228 if (control == NULL || opt == NULL) 3229 return (EINVAL); 3230 3231 init_ip6pktopts(opt); 3232 3233 /* 3234 * XXX: Currently, we assume all the optional information is stored 3235 * in a single mbuf. 3236 */ 3237 if (stickyopt) { 3238 int error; 3239 3240 /* 3241 * If stickyopt is provided, make a local copy of the options 3242 * for this particular packet, then override them by ancillary 3243 * objects. 3244 * XXX: copypktopts() does not copy the cached route to a next 3245 * hop (if any). This is not very good in terms of efficiency, 3246 * but we can allow this since this option should be rarely 3247 * used. 3248 */ 3249 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3250 return (error); 3251 } 3252 3253 /* 3254 * XXX: Currently, we assume all the optional information is stored 3255 * in a single mbuf. 3256 */ 3257 if (control->m_next) 3258 return (EINVAL); 3259 3260 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3261 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3262 int error; 3263 3264 if (control->m_len < CMSG_LEN(0)) 3265 return (EINVAL); 3266 3267 cm = mtod(control, struct cmsghdr *); 3268 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3269 return (EINVAL); 3270 if (cm->cmsg_level != IPPROTO_IPV6) 3271 continue; 3272 3273 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3274 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3275 if (error) 3276 return (error); 3277 } 3278 3279 return (0); 3280 } 3281 3282 /* 3283 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3284 * packet to the input queue of a specified interface. Note that this 3285 * calls the output routine of the loopback "driver", but with an interface 3286 * pointer that might NOT be &loif -- easier than replicating that code here. 3287 */ 3288 void 3289 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3290 { 3291 struct mbuf *copym; 3292 struct ip6_hdr *ip6; 3293 3294 copym = m_copy(m, 0, M_COPYALL); 3295 if (copym == NULL) 3296 return; 3297 3298 /* 3299 * Make sure to deep-copy IPv6 header portion in case the data 3300 * is in an mbuf cluster, so that we can safely override the IPv6 3301 * header portion later. 3302 */ 3303 if ((copym->m_flags & M_EXT) != 0 || 3304 copym->m_len < sizeof(struct ip6_hdr)) { 3305 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3306 if (copym == NULL) 3307 return; 3308 } 3309 3310 #ifdef DIAGNOSTIC 3311 if (copym->m_len < sizeof(*ip6)) { 3312 m_freem(copym); 3313 return; 3314 } 3315 #endif 3316 3317 ip6 = mtod(copym, struct ip6_hdr *); 3318 /* 3319 * clear embedded scope identifiers if necessary. 3320 * in6_clearscope will touch the addresses only when necessary. 3321 */ 3322 in6_clearscope(&ip6->ip6_src); 3323 in6_clearscope(&ip6->ip6_dst); 3324 3325 if_simloop(ifp, copym, dst->sin6_family, 0); 3326 } 3327 3328 /* 3329 * Separate the IPv6 header from the payload into its own mbuf. 3330 * 3331 * Returns the new mbuf chain or the original mbuf if no payload. 3332 * Returns NULL if can't allocate new mbuf for header. 3333 */ 3334 static struct mbuf * 3335 ip6_splithdr(struct mbuf *m) 3336 { 3337 struct mbuf *mh; 3338 3339 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3340 return (m); 3341 3342 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 3343 if (mh == NULL) 3344 return (NULL); 3345 mh->m_len = sizeof(struct ip6_hdr); 3346 M_MOVE_PKTHDR(mh, m); 3347 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3348 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3349 m->m_data += sizeof(struct ip6_hdr); 3350 m->m_len -= sizeof(struct ip6_hdr); 3351 mh->m_next = m; 3352 return (mh); 3353 } 3354 3355 /* 3356 * Compute IPv6 extension header length. 3357 */ 3358 int 3359 ip6_optlen(struct in6pcb *in6p) 3360 { 3361 int len; 3362 3363 if (!in6p->in6p_outputopts) 3364 return 0; 3365 3366 len = 0; 3367 #define elen(x) \ 3368 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3369 3370 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3371 if (in6p->in6p_outputopts->ip6po_rthdr) 3372 /* dest1 is valid with rthdr only */ 3373 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3374 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3375 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3376 return len; 3377 #undef elen 3378 } 3379