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sys/netinet6/ip6_output.c
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1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */ 2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include "opt_ip6fw.h" 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/errno.h> 73 #include <sys/protosw.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/systm.h> 77 #include <sys/kernel.h> 78 #include <sys/proc.h> 79 #include <sys/priv.h> 80 81 #include <sys/thread2.h> 82 #include <sys/msgport2.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 #include <net/pfil.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet6/in6_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet/in_pcb.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/ip6protosw.h> 97 98 #ifdef IPSEC 99 #include <netinet6/ipsec.h> 100 #ifdef INET6 101 #include <netinet6/ipsec6.h> 102 #endif 103 #include <netproto/key/key.h> 104 #endif /* IPSEC */ 105 106 #ifdef FAST_IPSEC 107 #include <netproto/ipsec/ipsec.h> 108 #include <netproto/ipsec/ipsec6.h> 109 #include <netproto/ipsec/key.h> 110 #endif 111 112 #include <net/ip6fw/ip6_fw.h> 113 114 #include <net/net_osdep.h> 115 116 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 117 118 struct ip6_exthdrs { 119 struct mbuf *ip6e_ip6; 120 struct mbuf *ip6e_hbh; 121 struct mbuf *ip6e_dest1; 122 struct mbuf *ip6e_rthdr; 123 struct mbuf *ip6e_dest2; 124 }; 125 126 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 127 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 128 int, int, int, int); 129 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 130 struct socket *, struct sockopt *); 131 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 132 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 133 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 134 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 135 struct ifnet *, struct in6_addr *, u_long *, int *); 136 static int copyexthdr (void *, struct mbuf **); 137 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 138 struct ip6_frag **); 139 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 140 static struct mbuf *ip6_splithdr (struct mbuf *); 141 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 142 143 /* 144 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 145 * header (with pri, len, nxt, hlim, src, dst). 146 * This function may modify ver and hlim only. 147 * The mbuf chain containing the packet will be freed. 148 * The mbuf opt, if present, will not be freed. 149 * 150 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 151 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 152 * which is rt_rmx.rmx_mtu. 153 */ 154 int 155 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 156 int flags, struct ip6_moptions *im6o, 157 struct ifnet **ifpp, /* XXX: just for statistics */ 158 struct inpcb *inp) 159 { 160 struct ip6_hdr *ip6, *mhip6; 161 struct ifnet *ifp, *origifp; 162 struct mbuf *m = m0; 163 struct mbuf *mprev; 164 u_char *nexthdrp; 165 int hlen, tlen, len, off; 166 struct route_in6 ip6route; 167 struct sockaddr_in6 *dst; 168 int error = 0; 169 struct in6_ifaddr *ia = NULL; 170 u_long mtu; 171 int alwaysfrag, dontfrag; 172 u_int32_t optlen, plen = 0, unfragpartlen; 173 struct ip6_exthdrs exthdrs; 174 struct in6_addr finaldst; 175 struct route_in6 *ro_pmtu = NULL; 176 boolean_t hdrsplit = FALSE; 177 boolean_t needipsec = FALSE; 178 #ifdef IPSEC 179 boolean_t needipsectun = FALSE; 180 struct secpolicy *sp = NULL; 181 struct socket *so = inp ? inp->inp_socket : NULL; 182 183 ip6 = mtod(m, struct ip6_hdr *); 184 #endif 185 #ifdef FAST_IPSEC 186 boolean_t needipsectun = FALSE; 187 struct secpolicy *sp = NULL; 188 189 ip6 = mtod(m, struct ip6_hdr *); 190 #endif 191 192 bzero(&exthdrs, sizeof exthdrs); 193 194 if (opt) { 195 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 196 goto freehdrs; 197 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 198 goto freehdrs; 199 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 200 goto freehdrs; 201 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 202 goto freehdrs; 203 } 204 205 #ifdef IPSEC 206 /* get a security policy for this packet */ 207 if (so == NULL) 208 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 209 else 210 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 211 212 if (sp == NULL) { 213 ipsec6stat.out_inval++; 214 goto freehdrs; 215 } 216 217 error = 0; 218 219 /* check policy */ 220 switch (sp->policy) { 221 case IPSEC_POLICY_DISCARD: 222 /* 223 * This packet is just discarded. 224 */ 225 ipsec6stat.out_polvio++; 226 goto freehdrs; 227 228 case IPSEC_POLICY_BYPASS: 229 case IPSEC_POLICY_NONE: 230 /* no need to do IPsec. */ 231 needipsec = FALSE; 232 break; 233 234 case IPSEC_POLICY_IPSEC: 235 if (sp->req == NULL) { 236 error = key_spdacquire(sp); /* acquire a policy */ 237 goto freehdrs; 238 } 239 needipsec = TRUE; 240 break; 241 242 case IPSEC_POLICY_ENTRUST: 243 default: 244 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 245 } 246 #endif /* IPSEC */ 247 #ifdef FAST_IPSEC 248 /* get a security policy for this packet */ 249 if (inp == NULL) 250 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 251 else 252 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 253 254 if (sp == NULL) { 255 newipsecstat.ips_out_inval++; 256 goto freehdrs; 257 } 258 259 error = 0; 260 261 /* check policy */ 262 switch (sp->policy) { 263 case IPSEC_POLICY_DISCARD: 264 /* 265 * This packet is just discarded. 266 */ 267 newipsecstat.ips_out_polvio++; 268 goto freehdrs; 269 270 case IPSEC_POLICY_BYPASS: 271 case IPSEC_POLICY_NONE: 272 /* no need to do IPsec. */ 273 needipsec = FALSE; 274 break; 275 276 case IPSEC_POLICY_IPSEC: 277 if (sp->req == NULL) { 278 error = key_spdacquire(sp); /* acquire a policy */ 279 goto freehdrs; 280 } 281 needipsec = TRUE; 282 break; 283 284 case IPSEC_POLICY_ENTRUST: 285 default: 286 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 287 } 288 #endif /* FAST_IPSEC */ 289 290 /* 291 * Calculate the total length of the extension header chain. 292 * Keep the length of the unfragmentable part for fragmentation. 293 */ 294 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 295 m_lengthm(exthdrs.ip6e_dest1, NULL) + 296 m_lengthm(exthdrs.ip6e_rthdr, NULL); 297 298 unfragpartlen = optlen + sizeof(struct ip6_hdr); 299 300 /* NOTE: we don't add AH/ESP length here. do that later. */ 301 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 302 303 /* 304 * If we need IPsec, or there is at least one extension header, 305 * separate IP6 header from the payload. 306 */ 307 if ((needipsec || optlen) && !hdrsplit) { 308 exthdrs.ip6e_ip6 = ip6_splithdr(m); 309 if (exthdrs.ip6e_ip6 == NULL) { 310 error = ENOBUFS; 311 goto freehdrs; 312 } 313 m = exthdrs.ip6e_ip6; 314 hdrsplit = TRUE; 315 } 316 317 /* adjust pointer */ 318 ip6 = mtod(m, struct ip6_hdr *); 319 320 /* adjust mbuf packet header length */ 321 m->m_pkthdr.len += optlen; 322 plen = m->m_pkthdr.len - sizeof(*ip6); 323 324 /* If this is a jumbo payload, insert a jumbo payload option. */ 325 if (plen > IPV6_MAXPACKET) { 326 if (!hdrsplit) { 327 exthdrs.ip6e_ip6 = ip6_splithdr(m); 328 if (exthdrs.ip6e_ip6 == NULL) { 329 error = ENOBUFS; 330 goto freehdrs; 331 } 332 m = exthdrs.ip6e_ip6; 333 hdrsplit = TRUE; 334 } 335 /* adjust pointer */ 336 ip6 = mtod(m, struct ip6_hdr *); 337 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 338 goto freehdrs; 339 ip6->ip6_plen = 0; 340 } else 341 ip6->ip6_plen = htons(plen); 342 343 /* 344 * Concatenate headers and fill in next header fields. 345 * Here we have, on "m" 346 * IPv6 payload 347 * and we insert headers accordingly. Finally, we should be getting: 348 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 349 * 350 * during the header composing process, "m" points to IPv6 header. 351 * "mprev" points to an extension header prior to esp. 352 */ 353 354 nexthdrp = &ip6->ip6_nxt; 355 mprev = m; 356 357 /* 358 * we treat dest2 specially. this makes IPsec processing 359 * much easier. the goal here is to make mprev point the 360 * mbuf prior to dest2. 361 * 362 * result: IPv6 dest2 payload 363 * m and mprev will point to IPv6 header. 364 */ 365 if (exthdrs.ip6e_dest2) { 366 if (!hdrsplit) 367 panic("assumption failed: hdr not split"); 368 exthdrs.ip6e_dest2->m_next = m->m_next; 369 m->m_next = exthdrs.ip6e_dest2; 370 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 371 ip6->ip6_nxt = IPPROTO_DSTOPTS; 372 } 373 374 /* 375 * Place m1 after mprev. 376 */ 377 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 378 do {\ 379 if (m1) {\ 380 if (!hdrsplit)\ 381 panic("assumption failed: hdr not split");\ 382 *mtod(m1, u_char *) = *nexthdrp;\ 383 *nexthdrp = (i);\ 384 nexthdrp = mtod(m1, u_char *);\ 385 m1->m_next = mprev->m_next;\ 386 mprev->m_next = m1;\ 387 mprev = m1;\ 388 }\ 389 } while (0) 390 391 /* 392 * result: IPv6 hbh dest1 rthdr dest2 payload 393 * m will point to IPv6 header. mprev will point to the 394 * extension header prior to dest2 (rthdr in the above case). 395 */ 396 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 397 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 399 400 #if defined(IPSEC) || defined(FAST_IPSEC) 401 if (needipsec) { 402 struct ipsec_output_state state; 403 int segleft_org = 0; 404 struct ip6_rthdr *rh = NULL; 405 406 /* 407 * pointers after IPsec headers are not valid any more. 408 * other pointers need a great care too. 409 * (IPsec routines should not mangle mbufs prior to AH/ESP) 410 */ 411 exthdrs.ip6e_dest2 = NULL; 412 413 if (exthdrs.ip6e_rthdr) { 414 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 415 segleft_org = rh->ip6r_segleft; 416 rh->ip6r_segleft = 0; 417 } 418 419 bzero(&state, sizeof state); 420 state.m = m; 421 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 422 &needipsectun); 423 m = state.m; 424 if (error) { 425 /* mbuf is already reclaimed in ipsec6_output_trans. */ 426 m = NULL; 427 switch (error) { 428 case EHOSTUNREACH: 429 case ENETUNREACH: 430 case EMSGSIZE: 431 case ENOBUFS: 432 case ENOMEM: 433 break; 434 default: 435 kprintf("ip6_output (ipsec): error code %d\n", 436 error); 437 /* fall through */ 438 case ENOENT: 439 /* don't show these error codes to the user */ 440 error = 0; 441 break; 442 } 443 goto bad; 444 } 445 if (exthdrs.ip6e_rthdr) { 446 /* ah6_output doesn't modify mbuf chain */ 447 rh->ip6r_segleft = segleft_org; 448 } 449 } 450 #endif 451 452 /* 453 * If there is a routing header, replace destination address field 454 * with the first hop of the routing header. 455 */ 456 if (exthdrs.ip6e_rthdr) { 457 struct ip6_rthdr *rh; 458 459 finaldst = ip6->ip6_dst; 460 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 461 switch (rh->ip6r_type) { 462 default: /* is it possible? */ 463 error = EINVAL; 464 goto bad; 465 } 466 } 467 468 /* Source address validation */ 469 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 470 !(flags & IPV6_DADOUTPUT)) { 471 error = EOPNOTSUPP; 472 ip6stat.ip6s_badscope++; 473 goto bad; 474 } 475 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 476 error = EOPNOTSUPP; 477 ip6stat.ip6s_badscope++; 478 goto bad; 479 } 480 481 ip6stat.ip6s_localout++; 482 483 /* 484 * Route packet. 485 */ 486 if (ro == NULL) { 487 ro = &ip6route; 488 bzero(ro, sizeof(*ro)); 489 } 490 ro_pmtu = ro; 491 if (opt && opt->ip6po_rthdr) 492 ro = &opt->ip6po_route; 493 dst = (struct sockaddr_in6 *)&ro->ro_dst; 494 /* 495 * If there is a cached route, 496 * check that it is to the same destination 497 * and is still up. If not, free it and try again. 498 */ 499 if (ro->ro_rt != NULL && 500 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 501 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 502 RTFREE(ro->ro_rt); 503 ro->ro_rt = NULL; 504 } 505 if (ro->ro_rt == NULL) { 506 bzero(dst, sizeof(*dst)); 507 dst->sin6_family = AF_INET6; 508 dst->sin6_len = sizeof(struct sockaddr_in6); 509 dst->sin6_addr = ip6->ip6_dst; 510 } 511 #if defined(IPSEC) || defined(FAST_IPSEC) 512 if (needipsec && needipsectun) { 513 struct ipsec_output_state state; 514 515 /* 516 * All the extension headers will become inaccessible 517 * (since they can be encrypted). 518 * Don't panic, we need no more updates to extension headers 519 * on inner IPv6 packet (since they are now encapsulated). 520 * 521 * IPv6 [ESP|AH] IPv6 [extension headers] payload 522 */ 523 bzero(&exthdrs, sizeof(exthdrs)); 524 exthdrs.ip6e_ip6 = m; 525 526 bzero(&state, sizeof(state)); 527 state.m = m; 528 state.ro = (struct route *)ro; 529 state.dst = (struct sockaddr *)dst; 530 531 error = ipsec6_output_tunnel(&state, sp, flags); 532 533 m = state.m; 534 ro = (struct route_in6 *)state.ro; 535 dst = (struct sockaddr_in6 *)state.dst; 536 if (error) { 537 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 538 m0 = m = NULL; 539 m = NULL; 540 switch (error) { 541 case EHOSTUNREACH: 542 case ENETUNREACH: 543 case EMSGSIZE: 544 case ENOBUFS: 545 case ENOMEM: 546 break; 547 default: 548 kprintf("ip6_output (ipsec): error code %d\n", error); 549 /* fall through */ 550 case ENOENT: 551 /* don't show these error codes to the user */ 552 error = 0; 553 break; 554 } 555 goto bad; 556 } 557 558 exthdrs.ip6e_ip6 = m; 559 } 560 #endif 561 562 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 563 /* Unicast */ 564 565 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 566 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 567 /* xxx 568 * interface selection comes here 569 * if an interface is specified from an upper layer, 570 * ifp must point it. 571 */ 572 if (ro->ro_rt == NULL) { 573 /* 574 * non-bsdi always clone routes, if parent is 575 * PRF_CLONING. 576 */ 577 rtalloc((struct route *)ro); 578 } 579 if (ro->ro_rt == NULL) { 580 ip6stat.ip6s_noroute++; 581 error = EHOSTUNREACH; 582 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 583 goto bad; 584 } 585 ia = ifatoia6(ro->ro_rt->rt_ifa); 586 ifp = ro->ro_rt->rt_ifp; 587 ro->ro_rt->rt_use++; 588 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 589 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 590 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 591 592 in6_ifstat_inc(ifp, ifs6_out_request); 593 594 /* 595 * Check if the outgoing interface conflicts with 596 * the interface specified by ifi6_ifindex (if specified). 597 * Note that loopback interface is always okay. 598 * (this may happen when we are sending a packet to one of 599 * our own addresses.) 600 */ 601 if (opt && opt->ip6po_pktinfo 602 && opt->ip6po_pktinfo->ipi6_ifindex) { 603 if (!(ifp->if_flags & IFF_LOOPBACK) 604 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 605 ip6stat.ip6s_noroute++; 606 in6_ifstat_inc(ifp, ifs6_out_discard); 607 error = EHOSTUNREACH; 608 goto bad; 609 } 610 } 611 612 if (opt && opt->ip6po_hlim != -1) 613 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 614 } else { 615 /* Multicast */ 616 struct in6_multi *in6m; 617 618 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 619 620 /* 621 * See if the caller provided any multicast options 622 */ 623 ifp = NULL; 624 if (im6o != NULL) { 625 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 626 if (im6o->im6o_multicast_ifp != NULL) 627 ifp = im6o->im6o_multicast_ifp; 628 } else 629 ip6->ip6_hlim = ip6_defmcasthlim; 630 631 /* 632 * See if the caller provided the outgoing interface 633 * as an ancillary data. 634 * Boundary check for ifindex is assumed to be already done. 635 */ 636 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 637 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 638 639 /* 640 * If the destination is a node-local scope multicast, 641 * the packet should be loop-backed only. 642 */ 643 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 644 /* 645 * If the outgoing interface is already specified, 646 * it should be a loopback interface. 647 */ 648 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 649 ip6stat.ip6s_badscope++; 650 error = ENETUNREACH; /* XXX: better error? */ 651 /* XXX correct ifp? */ 652 in6_ifstat_inc(ifp, ifs6_out_discard); 653 goto bad; 654 } else { 655 ifp = &loif[0]; 656 } 657 } 658 659 if (opt && opt->ip6po_hlim != -1) 660 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 661 662 /* 663 * If caller did not provide an interface lookup a 664 * default in the routing table. This is either a 665 * default for the speicfied group (i.e. a host 666 * route), or a multicast default (a route for the 667 * ``net'' ff00::/8). 668 */ 669 if (ifp == NULL) { 670 if (ro->ro_rt == NULL) { 671 ro->ro_rt = 672 rtpurelookup((struct sockaddr *)&ro->ro_dst); 673 } 674 if (ro->ro_rt == NULL) { 675 ip6stat.ip6s_noroute++; 676 error = EHOSTUNREACH; 677 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 678 goto bad; 679 } 680 ia = ifatoia6(ro->ro_rt->rt_ifa); 681 ifp = ro->ro_rt->rt_ifp; 682 ro->ro_rt->rt_use++; 683 } 684 685 if (!(flags & IPV6_FORWARDING)) 686 in6_ifstat_inc(ifp, ifs6_out_request); 687 in6_ifstat_inc(ifp, ifs6_out_mcast); 688 689 /* 690 * Confirm that the outgoing interface supports multicast. 691 */ 692 if (!(ifp->if_flags & IFF_MULTICAST)) { 693 ip6stat.ip6s_noroute++; 694 in6_ifstat_inc(ifp, ifs6_out_discard); 695 error = ENETUNREACH; 696 goto bad; 697 } 698 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 699 if (in6m != NULL && 700 (im6o == NULL || im6o->im6o_multicast_loop)) { 701 /* 702 * If we belong to the destination multicast group 703 * on the outgoing interface, and the caller did not 704 * forbid loopback, loop back a copy. 705 */ 706 ip6_mloopback(ifp, m, dst); 707 } else { 708 /* 709 * If we are acting as a multicast router, perform 710 * multicast forwarding as if the packet had just 711 * arrived on the interface to which we are about 712 * to send. The multicast forwarding function 713 * recursively calls this function, using the 714 * IPV6_FORWARDING flag to prevent infinite recursion. 715 * 716 * Multicasts that are looped back by ip6_mloopback(), 717 * above, will be forwarded by the ip6_input() routine, 718 * if necessary. 719 */ 720 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 721 if (ip6_mforward(ip6, ifp, m) != 0) { 722 m_freem(m); 723 goto done; 724 } 725 } 726 } 727 /* 728 * Multicasts with a hoplimit of zero may be looped back, 729 * above, but must not be transmitted on a network. 730 * Also, multicasts addressed to the loopback interface 731 * are not sent -- the above call to ip6_mloopback() will 732 * loop back a copy if this host actually belongs to the 733 * destination group on the loopback interface. 734 */ 735 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 736 m_freem(m); 737 goto done; 738 } 739 } 740 741 /* 742 * Fill the outgoing inteface to tell the upper layer 743 * to increment per-interface statistics. 744 */ 745 if (ifpp) 746 *ifpp = ifp; 747 748 /* Determine path MTU. */ 749 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 750 &alwaysfrag)) != 0) 751 goto bad; 752 753 /* 754 * The caller of this function may specify to use the minimum MTU 755 * in some cases. 756 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 757 * setting. The logic is a bit complicated; by default, unicast 758 * packets will follow path MTU while multicast packets will be sent at 759 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 760 * including unicast ones will be sent at the minimum MTU. Multicast 761 * packets will always be sent at the minimum MTU unless 762 * IP6PO_MINMTU_DISABLE is explicitly specified. 763 * See RFC 3542 for more details. 764 */ 765 if (mtu > IPV6_MMTU) { 766 if ((flags & IPV6_MINMTU)) 767 mtu = IPV6_MMTU; 768 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 769 mtu = IPV6_MMTU; 770 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 771 (opt == NULL || 772 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 773 mtu = IPV6_MMTU; 774 } 775 } 776 777 /* Fake scoped addresses */ 778 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 779 /* 780 * If source or destination address is a scoped address, and 781 * the packet is going to be sent to a loopback interface, 782 * we should keep the original interface. 783 */ 784 785 /* 786 * XXX: this is a very experimental and temporary solution. 787 * We eventually have sockaddr_in6 and use the sin6_scope_id 788 * field of the structure here. 789 * We rely on the consistency between two scope zone ids 790 * of source and destination, which should already be assured. 791 * Larger scopes than link will be supported in the future. 792 */ 793 origifp = NULL; 794 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 795 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 796 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 797 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 798 /* 799 * XXX: origifp can be NULL even in those two cases above. 800 * For example, if we remove the (only) link-local address 801 * from the loopback interface, and try to send a link-local 802 * address without link-id information. Then the source 803 * address is ::1, and the destination address is the 804 * link-local address with its s6_addr16[1] being zero. 805 * What is worse, if the packet goes to the loopback interface 806 * by a default rejected route, the null pointer would be 807 * passed to looutput, and the kernel would hang. 808 * The following last resort would prevent such disaster. 809 */ 810 if (origifp == NULL) 811 origifp = ifp; 812 } 813 else 814 origifp = ifp; 815 /* 816 * clear embedded scope identifiers if necessary. 817 * in6_clearscope will touch the addresses only when necessary. 818 */ 819 in6_clearscope(&ip6->ip6_src); 820 in6_clearscope(&ip6->ip6_dst); 821 822 /* 823 * Check with the firewall... 824 */ 825 if (ip6_fw_enable && ip6_fw_chk_ptr) { 826 u_short port = 0; 827 828 m->m_pkthdr.rcvif = NULL; /* XXX */ 829 /* If ipfw says divert, we have to just drop packet */ 830 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 831 m_freem(m); 832 goto done; 833 } 834 if (!m) { 835 error = EACCES; 836 goto done; 837 } 838 } 839 840 /* 841 * If the outgoing packet contains a hop-by-hop options header, 842 * it must be examined and processed even by the source node. 843 * (RFC 2460, section 4.) 844 */ 845 if (exthdrs.ip6e_hbh) { 846 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 847 u_int32_t dummy1; /* XXX unused */ 848 u_int32_t dummy2; /* XXX unused */ 849 850 #ifdef DIAGNOSTIC 851 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 852 panic("ip6e_hbh is not continuous"); 853 #endif 854 /* 855 * XXX: if we have to send an ICMPv6 error to the sender, 856 * we need the M_LOOP flag since icmp6_error() expects 857 * the IPv6 and the hop-by-hop options header are 858 * continuous unless the flag is set. 859 */ 860 m->m_flags |= M_LOOP; 861 m->m_pkthdr.rcvif = ifp; 862 if (ip6_process_hopopts(m, 863 (u_int8_t *)(hbh + 1), 864 ((hbh->ip6h_len + 1) << 3) - 865 sizeof(struct ip6_hbh), 866 &dummy1, &dummy2) < 0) { 867 /* m was already freed at this point */ 868 error = EINVAL;/* better error? */ 869 goto done; 870 } 871 m->m_flags &= ~M_LOOP; /* XXX */ 872 m->m_pkthdr.rcvif = NULL; 873 } 874 875 /* 876 * Run through list of hooks for output packets. 877 */ 878 if (pfil_has_hooks(&inet6_pfil_hook)) { 879 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 880 if (error != 0 || m == NULL) 881 goto done; 882 ip6 = mtod(m, struct ip6_hdr *); 883 } 884 885 /* 886 * Send the packet to the outgoing interface. 887 * If necessary, do IPv6 fragmentation before sending. 888 * 889 * the logic here is rather complex: 890 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 891 * 1-a: send as is if tlen <= path mtu 892 * 1-b: fragment if tlen > path mtu 893 * 894 * 2: if user asks us not to fragment (dontfrag == 1) 895 * 2-a: send as is if tlen <= interface mtu 896 * 2-b: error if tlen > interface mtu 897 * 898 * 3: if we always need to attach fragment header (alwaysfrag == 1) 899 * always fragment 900 * 901 * 4: if dontfrag == 1 && alwaysfrag == 1 902 * error, as we cannot handle this conflicting request 903 */ 904 tlen = m->m_pkthdr.len; 905 906 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 907 dontfrag = 1; 908 else 909 dontfrag = 0; 910 if (dontfrag && alwaysfrag) { /* case 4 */ 911 /* conflicting request - can't transmit */ 912 error = EMSGSIZE; 913 goto bad; 914 } 915 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 916 /* 917 * Even if the DONTFRAG option is specified, we cannot send the 918 * packet when the data length is larger than the MTU of the 919 * outgoing interface. 920 * Notify the error by sending IPV6_PATHMTU ancillary data as 921 * well as returning an error code (the latter is not described 922 * in the API spec.) 923 */ 924 u_int32_t mtu32; 925 struct ip6ctlparam ip6cp; 926 927 mtu32 = (u_int32_t)mtu; 928 bzero(&ip6cp, sizeof(ip6cp)); 929 ip6cp.ip6c_cmdarg = (void *)&mtu32; 930 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 931 (void *)&ip6cp); 932 933 error = EMSGSIZE; 934 goto bad; 935 } 936 937 /* 938 * transmit packet without fragmentation 939 */ 940 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 941 struct in6_ifaddr *ia6; 942 943 ip6 = mtod(m, struct ip6_hdr *); 944 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 945 if (ia6) { 946 /* Record statistics for this interface address. */ 947 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1); 948 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len); 949 } 950 #ifdef IPSEC 951 /* clean ipsec history once it goes out of the node */ 952 ipsec_delaux(m); 953 #endif 954 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 955 goto done; 956 } 957 958 /* 959 * try to fragment the packet. case 1-b and 3 960 */ 961 if (mtu < IPV6_MMTU) { 962 /* 963 * note that path MTU is never less than IPV6_MMTU 964 * (see icmp6_input). 965 */ 966 error = EMSGSIZE; 967 in6_ifstat_inc(ifp, ifs6_out_fragfail); 968 goto bad; 969 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 970 error = EMSGSIZE; 971 in6_ifstat_inc(ifp, ifs6_out_fragfail); 972 goto bad; 973 } else { 974 struct mbuf **mnext, *m_frgpart; 975 struct ip6_frag *ip6f; 976 u_int32_t id = htonl(ip6_id++); 977 u_char nextproto; 978 979 /* 980 * Too large for the destination or interface; 981 * fragment if possible. 982 * Must be able to put at least 8 bytes per fragment. 983 */ 984 hlen = unfragpartlen; 985 if (mtu > IPV6_MAXPACKET) 986 mtu = IPV6_MAXPACKET; 987 988 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 989 if (len < 8) { 990 error = EMSGSIZE; 991 in6_ifstat_inc(ifp, ifs6_out_fragfail); 992 goto bad; 993 } 994 995 mnext = &m->m_nextpkt; 996 997 /* 998 * Change the next header field of the last header in the 999 * unfragmentable part. 1000 */ 1001 if (exthdrs.ip6e_rthdr) { 1002 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1003 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1004 } else if (exthdrs.ip6e_dest1) { 1005 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1006 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1007 } else if (exthdrs.ip6e_hbh) { 1008 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1009 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1010 } else { 1011 nextproto = ip6->ip6_nxt; 1012 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1013 } 1014 1015 /* 1016 * Loop through length of segment after first fragment, 1017 * make new header and copy data of each part and link onto 1018 * chain. 1019 */ 1020 m0 = m; 1021 for (off = hlen; off < tlen; off += len) { 1022 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1023 if (!m) { 1024 error = ENOBUFS; 1025 ip6stat.ip6s_odropped++; 1026 goto sendorfree; 1027 } 1028 m->m_pkthdr.rcvif = NULL; 1029 m->m_flags = m0->m_flags & M_COPYFLAGS; 1030 *mnext = m; 1031 mnext = &m->m_nextpkt; 1032 m->m_data += max_linkhdr; 1033 mhip6 = mtod(m, struct ip6_hdr *); 1034 *mhip6 = *ip6; 1035 m->m_len = sizeof(*mhip6); 1036 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1037 if (error) { 1038 ip6stat.ip6s_odropped++; 1039 goto sendorfree; 1040 } 1041 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1042 if (off + len >= tlen) 1043 len = tlen - off; 1044 else 1045 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1046 mhip6->ip6_plen = htons((u_short)(len + hlen + 1047 sizeof(*ip6f) - 1048 sizeof(struct ip6_hdr))); 1049 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1050 error = ENOBUFS; 1051 ip6stat.ip6s_odropped++; 1052 goto sendorfree; 1053 } 1054 m_cat(m, m_frgpart); 1055 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1056 m->m_pkthdr.rcvif = NULL; 1057 ip6f->ip6f_reserved = 0; 1058 ip6f->ip6f_ident = id; 1059 ip6f->ip6f_nxt = nextproto; 1060 ip6stat.ip6s_ofragments++; 1061 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1062 } 1063 1064 in6_ifstat_inc(ifp, ifs6_out_fragok); 1065 } 1066 1067 /* 1068 * Remove leading garbages. 1069 */ 1070 sendorfree: 1071 m = m0->m_nextpkt; 1072 m0->m_nextpkt = NULL; 1073 m_freem(m0); 1074 for (m0 = m; m; m = m0) { 1075 m0 = m->m_nextpkt; 1076 m->m_nextpkt = NULL; 1077 if (error == 0) { 1078 /* Record statistics for this interface address. */ 1079 if (ia) { 1080 IFA_STAT_INC(&ia->ia_ifa, opackets, 1); 1081 IFA_STAT_INC(&ia->ia_ifa, obytes, 1082 m->m_pkthdr.len); 1083 } 1084 #ifdef IPSEC 1085 /* clean ipsec history once it goes out of the node */ 1086 ipsec_delaux(m); 1087 #endif 1088 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1089 } else 1090 m_freem(m); 1091 } 1092 1093 if (error == 0) 1094 ip6stat.ip6s_fragmented++; 1095 1096 done: 1097 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1098 RTFREE(ro->ro_rt); 1099 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1100 RTFREE(ro_pmtu->ro_rt); 1101 } 1102 1103 #ifdef IPSEC 1104 if (sp != NULL) 1105 key_freesp(sp); 1106 #endif 1107 #ifdef FAST_IPSEC 1108 if (sp != NULL) 1109 KEY_FREESP(&sp); 1110 #endif 1111 1112 return (error); 1113 1114 freehdrs: 1115 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1116 m_freem(exthdrs.ip6e_dest1); 1117 m_freem(exthdrs.ip6e_rthdr); 1118 m_freem(exthdrs.ip6e_dest2); 1119 /* fall through */ 1120 bad: 1121 m_freem(m); 1122 goto done; 1123 } 1124 1125 static int 1126 copyexthdr(void *h, struct mbuf **mp) 1127 { 1128 struct ip6_ext *hdr = h; 1129 int hlen; 1130 struct mbuf *m; 1131 1132 if (hdr == NULL) 1133 return 0; 1134 1135 hlen = (hdr->ip6e_len + 1) * 8; 1136 if (hlen > MCLBYTES) 1137 return ENOBUFS; /* XXX */ 1138 1139 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0); 1140 if (!m) 1141 return ENOBUFS; 1142 m->m_len = hlen; 1143 1144 bcopy(hdr, mtod(m, caddr_t), hlen); 1145 1146 *mp = m; 1147 return 0; 1148 } 1149 1150 /* 1151 * Insert jumbo payload option. 1152 */ 1153 static int 1154 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1155 { 1156 struct mbuf *mopt; 1157 u_char *optbuf; 1158 u_int32_t v; 1159 1160 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1161 1162 /* 1163 * If there is no hop-by-hop options header, allocate new one. 1164 * If there is one but it doesn't have enough space to store the 1165 * jumbo payload option, allocate a cluster to store the whole options. 1166 * Otherwise, use it to store the options. 1167 */ 1168 if (exthdrs->ip6e_hbh == NULL) { 1169 MGET(mopt, MB_DONTWAIT, MT_DATA); 1170 if (mopt == NULL) 1171 return (ENOBUFS); 1172 mopt->m_len = JUMBOOPTLEN; 1173 optbuf = mtod(mopt, u_char *); 1174 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1175 exthdrs->ip6e_hbh = mopt; 1176 } else { 1177 struct ip6_hbh *hbh; 1178 1179 mopt = exthdrs->ip6e_hbh; 1180 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1181 /* 1182 * XXX assumption: 1183 * - exthdrs->ip6e_hbh is not referenced from places 1184 * other than exthdrs. 1185 * - exthdrs->ip6e_hbh is not an mbuf chain. 1186 */ 1187 int oldoptlen = mopt->m_len; 1188 struct mbuf *n; 1189 1190 /* 1191 * XXX: give up if the whole (new) hbh header does 1192 * not fit even in an mbuf cluster. 1193 */ 1194 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1195 return (ENOBUFS); 1196 1197 /* 1198 * As a consequence, we must always prepare a cluster 1199 * at this point. 1200 */ 1201 n = m_getcl(MB_DONTWAIT, MT_DATA, 0); 1202 if (!n) 1203 return (ENOBUFS); 1204 n->m_len = oldoptlen + JUMBOOPTLEN; 1205 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1206 optbuf = mtod(n, caddr_t) + oldoptlen; 1207 m_freem(mopt); 1208 mopt = exthdrs->ip6e_hbh = n; 1209 } else { 1210 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1211 mopt->m_len += JUMBOOPTLEN; 1212 } 1213 optbuf[0] = IP6OPT_PADN; 1214 optbuf[1] = 1; 1215 1216 /* 1217 * Adjust the header length according to the pad and 1218 * the jumbo payload option. 1219 */ 1220 hbh = mtod(mopt, struct ip6_hbh *); 1221 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1222 } 1223 1224 /* fill in the option. */ 1225 optbuf[2] = IP6OPT_JUMBO; 1226 optbuf[3] = 4; 1227 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1228 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1229 1230 /* finally, adjust the packet header length */ 1231 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1232 1233 return (0); 1234 #undef JUMBOOPTLEN 1235 } 1236 1237 /* 1238 * Insert fragment header and copy unfragmentable header portions. 1239 */ 1240 static int 1241 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1242 struct ip6_frag **frghdrp) 1243 { 1244 struct mbuf *n, *mlast; 1245 1246 if (hlen > sizeof(struct ip6_hdr)) { 1247 n = m_copym(m0, sizeof(struct ip6_hdr), 1248 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1249 if (n == NULL) 1250 return (ENOBUFS); 1251 m->m_next = n; 1252 } else 1253 n = m; 1254 1255 /* Search for the last mbuf of unfragmentable part. */ 1256 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1257 ; 1258 1259 if (!(mlast->m_flags & M_EXT) && 1260 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1261 /* use the trailing space of the last mbuf for the fragment hdr */ 1262 *frghdrp = 1263 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1264 mlast->m_len += sizeof(struct ip6_frag); 1265 m->m_pkthdr.len += sizeof(struct ip6_frag); 1266 } else { 1267 /* allocate a new mbuf for the fragment header */ 1268 struct mbuf *mfrg; 1269 1270 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1271 if (mfrg == NULL) 1272 return (ENOBUFS); 1273 mfrg->m_len = sizeof(struct ip6_frag); 1274 *frghdrp = mtod(mfrg, struct ip6_frag *); 1275 mlast->m_next = mfrg; 1276 } 1277 1278 return (0); 1279 } 1280 1281 static int 1282 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1283 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1284 int *alwaysfragp) 1285 { 1286 u_int32_t mtu = 0; 1287 int alwaysfrag = 0; 1288 int error = 0; 1289 1290 if (ro_pmtu != ro) { 1291 /* The first hop and the final destination may differ. */ 1292 struct sockaddr_in6 *sa6_dst = 1293 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1294 if (ro_pmtu->ro_rt && 1295 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1296 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1297 RTFREE(ro_pmtu->ro_rt); 1298 ro_pmtu->ro_rt = NULL; 1299 } 1300 if (ro_pmtu->ro_rt == NULL) { 1301 bzero(sa6_dst, sizeof(*sa6_dst)); 1302 sa6_dst->sin6_family = AF_INET6; 1303 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1304 sa6_dst->sin6_addr = *dst; 1305 1306 rtalloc((struct route *)ro_pmtu); 1307 } 1308 } 1309 if (ro_pmtu->ro_rt) { 1310 u_int32_t ifmtu; 1311 struct in_conninfo inc; 1312 1313 bzero(&inc, sizeof(inc)); 1314 inc.inc_flags = 1; /* IPv6 */ 1315 inc.inc6_faddr = *dst; 1316 1317 if (ifp == NULL) 1318 ifp = ro_pmtu->ro_rt->rt_ifp; 1319 ifmtu = IN6_LINKMTU(ifp); 1320 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1321 if (mtu == 0) 1322 mtu = ifmtu; 1323 else if (mtu < IPV6_MMTU) { 1324 /* 1325 * RFC2460 section 5, last paragraph: 1326 * if we record ICMPv6 too big message with 1327 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1328 * or smaller, with framgent header attached. 1329 * (fragment header is needed regardless from the 1330 * packet size, for translators to identify packets) 1331 */ 1332 alwaysfrag = 1; 1333 mtu = IPV6_MMTU; 1334 } else if (mtu > ifmtu) { 1335 /* 1336 * The MTU on the route is larger than the MTU on 1337 * the interface! This shouldn't happen, unless the 1338 * MTU of the interface has been changed after the 1339 * interface was brought up. Change the MTU in the 1340 * route to match the interface MTU (as long as the 1341 * field isn't locked). 1342 */ 1343 mtu = ifmtu; 1344 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1345 } 1346 } else if (ifp) { 1347 mtu = IN6_LINKMTU(ifp); 1348 } else 1349 error = EHOSTUNREACH; /* XXX */ 1350 1351 *mtup = mtu; 1352 if (alwaysfragp) 1353 *alwaysfragp = alwaysfrag; 1354 return (error); 1355 } 1356 1357 /* 1358 * IP6 socket option processing. 1359 */ 1360 void 1361 ip6_ctloutput_dispatch(netmsg_t msg) 1362 { 1363 int error; 1364 1365 error = ip6_ctloutput(msg->ctloutput.base.nm_so, 1366 msg->ctloutput.nm_sopt); 1367 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 1368 } 1369 1370 int 1371 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1372 { 1373 int optdatalen,uproto; 1374 int privileged; 1375 struct inpcb *in6p = so->so_pcb; 1376 void *optdata; 1377 int error, optval; 1378 int level, op, optname; 1379 int optlen; 1380 struct thread *td; 1381 1382 if (sopt) { 1383 level = sopt->sopt_level; 1384 op = sopt->sopt_dir; 1385 optname = sopt->sopt_name; 1386 optlen = sopt->sopt_valsize; 1387 td = sopt->sopt_td; 1388 } else { 1389 panic("ip6_ctloutput: arg soopt is NULL"); 1390 /* NOT REACHED */ 1391 td = NULL; 1392 } 1393 error = optval = 0; 1394 1395 uproto = (int)so->so_proto->pr_protocol; 1396 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1; 1397 1398 if (level == IPPROTO_IPV6) { 1399 switch (op) { 1400 1401 case SOPT_SET: 1402 switch (optname) { 1403 case IPV6_2292PKTOPTIONS: 1404 #ifdef IPV6_PKTOPTIONS 1405 case IPV6_PKTOPTIONS: 1406 #endif 1407 { 1408 struct mbuf *m; 1409 1410 error = soopt_getm(sopt, &m); /* XXX */ 1411 if (error != 0) 1412 break; 1413 soopt_to_mbuf(sopt, m); /* XXX */ 1414 error = ip6_pcbopts(&in6p->in6p_outputopts, 1415 m, so, sopt); 1416 m_freem(m); /* XXX */ 1417 break; 1418 } 1419 1420 /* 1421 * Use of some Hop-by-Hop options or some 1422 * Destination options, might require special 1423 * privilege. That is, normal applications 1424 * (without special privilege) might be forbidden 1425 * from setting certain options in outgoing packets, 1426 * and might never see certain options in received 1427 * packets. [RFC 2292 Section 6] 1428 * KAME specific note: 1429 * KAME prevents non-privileged users from sending or 1430 * receiving ANY hbh/dst options in order to avoid 1431 * overhead of parsing options in the kernel. 1432 */ 1433 case IPV6_RECVHOPOPTS: 1434 case IPV6_RECVDSTOPTS: 1435 case IPV6_RECVRTHDRDSTOPTS: 1436 if (!privileged) 1437 return (EPERM); 1438 case IPV6_RECVPKTINFO: 1439 case IPV6_RECVHOPLIMIT: 1440 case IPV6_RECVRTHDR: 1441 case IPV6_RECVPATHMTU: 1442 case IPV6_RECVTCLASS: 1443 case IPV6_AUTOFLOWLABEL: 1444 case IPV6_HOPLIMIT: 1445 /* FALLTHROUGH */ 1446 case IPV6_UNICAST_HOPS: 1447 case IPV6_FAITH: 1448 1449 case IPV6_V6ONLY: 1450 if (optlen != sizeof(int)) { 1451 error = EINVAL; 1452 break; 1453 } 1454 error = soopt_to_kbuf(sopt, &optval, 1455 sizeof optval, sizeof optval); 1456 if (error) 1457 break; 1458 switch (optname) { 1459 1460 case IPV6_UNICAST_HOPS: 1461 if (optval < -1 || optval >= 256) 1462 error = EINVAL; 1463 else { 1464 /* -1 = kernel default */ 1465 in6p->in6p_hops = optval; 1466 1467 if ((in6p->in6p_vflag & 1468 INP_IPV4) != 0) 1469 in6p->inp_ip_ttl = optval; 1470 } 1471 break; 1472 #define OPTSET(bit) \ 1473 do { \ 1474 if (optval) \ 1475 in6p->in6p_flags |= (bit); \ 1476 else \ 1477 in6p->in6p_flags &= ~(bit); \ 1478 } while (0) 1479 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1480 /* 1481 * Although changed to RFC3542, It's better to also support RFC2292 API 1482 */ 1483 #define OPTSET2292(bit) \ 1484 do { \ 1485 in6p->in6p_flags |= IN6P_RFC2292; \ 1486 if (optval) \ 1487 in6p->in6p_flags |= (bit); \ 1488 else \ 1489 in6p->in6p_flags &= ~(bit); \ 1490 } while (/*CONSTCOND*/ 0) 1491 1492 case IPV6_RECVPKTINFO: 1493 /* cannot mix with RFC2292 */ 1494 if (OPTBIT(IN6P_RFC2292)) { 1495 error = EINVAL; 1496 break; 1497 } 1498 OPTSET(IN6P_PKTINFO); 1499 break; 1500 1501 case IPV6_HOPLIMIT: 1502 { 1503 struct ip6_pktopts **optp; 1504 1505 /* cannot mix with RFC2292 */ 1506 if (OPTBIT(IN6P_RFC2292)) { 1507 error = EINVAL; 1508 break; 1509 } 1510 optp = &in6p->in6p_outputopts; 1511 error = ip6_pcbopt(IPV6_HOPLIMIT, 1512 (u_char *)&optval, sizeof(optval), 1513 optp, uproto); 1514 break; 1515 } 1516 1517 case IPV6_RECVHOPLIMIT: 1518 /* cannot mix with RFC2292 */ 1519 if (OPTBIT(IN6P_RFC2292)) { 1520 error = EINVAL; 1521 break; 1522 } 1523 OPTSET(IN6P_HOPLIMIT); 1524 break; 1525 1526 case IPV6_RECVHOPOPTS: 1527 /* cannot mix with RFC2292 */ 1528 if (OPTBIT(IN6P_RFC2292)) { 1529 error = EINVAL; 1530 break; 1531 } 1532 OPTSET(IN6P_HOPOPTS); 1533 break; 1534 1535 case IPV6_RECVDSTOPTS: 1536 /* cannot mix with RFC2292 */ 1537 if (OPTBIT(IN6P_RFC2292)) { 1538 error = EINVAL; 1539 break; 1540 } 1541 OPTSET(IN6P_DSTOPTS); 1542 break; 1543 1544 case IPV6_RECVRTHDRDSTOPTS: 1545 /* cannot mix with RFC2292 */ 1546 if (OPTBIT(IN6P_RFC2292)) { 1547 error = EINVAL; 1548 break; 1549 } 1550 OPTSET(IN6P_RTHDRDSTOPTS); 1551 break; 1552 1553 case IPV6_RECVRTHDR: 1554 /* cannot mix with RFC2292 */ 1555 if (OPTBIT(IN6P_RFC2292)) { 1556 error = EINVAL; 1557 break; 1558 } 1559 OPTSET(IN6P_RTHDR); 1560 break; 1561 1562 case IPV6_RECVPATHMTU: 1563 /* 1564 * We ignore this option for TCP 1565 * sockets. 1566 * (RFC3542 leaves this case 1567 * unspecified.) 1568 */ 1569 if (uproto != IPPROTO_TCP) 1570 OPTSET(IN6P_MTU); 1571 break; 1572 1573 case IPV6_RECVTCLASS: 1574 /* cannot mix with RFC2292 XXX */ 1575 if (OPTBIT(IN6P_RFC2292)) { 1576 error = EINVAL; 1577 break; 1578 } 1579 OPTSET(IN6P_TCLASS); 1580 break; 1581 1582 case IPV6_AUTOFLOWLABEL: 1583 OPTSET(IN6P_AUTOFLOWLABEL); 1584 break; 1585 1586 case IPV6_FAITH: 1587 OPTSET(IN6P_FAITH); 1588 break; 1589 1590 case IPV6_V6ONLY: 1591 /* 1592 * make setsockopt(IPV6_V6ONLY) 1593 * available only prior to bind(2). 1594 */ 1595 if (in6p->in6p_lport || 1596 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1597 { 1598 error = EINVAL; 1599 break; 1600 } 1601 OPTSET(IN6P_IPV6_V6ONLY); 1602 if (optval) 1603 in6p->in6p_vflag &= ~INP_IPV4; 1604 else 1605 in6p->in6p_vflag |= INP_IPV4; 1606 break; 1607 } 1608 break; 1609 1610 case IPV6_TCLASS: 1611 case IPV6_DONTFRAG: 1612 case IPV6_USE_MIN_MTU: 1613 case IPV6_PREFER_TEMPADDR: 1614 if (optlen != sizeof(optval)) { 1615 error = EINVAL; 1616 break; 1617 } 1618 error = soopt_to_kbuf(sopt, &optval, 1619 sizeof optval, sizeof optval); 1620 if (error) 1621 break; 1622 { 1623 struct ip6_pktopts **optp; 1624 optp = &in6p->in6p_outputopts; 1625 error = ip6_pcbopt(optname, 1626 (u_char *)&optval, sizeof(optval), 1627 optp, uproto); 1628 break; 1629 } 1630 1631 case IPV6_2292PKTINFO: 1632 case IPV6_2292HOPLIMIT: 1633 case IPV6_2292HOPOPTS: 1634 case IPV6_2292DSTOPTS: 1635 case IPV6_2292RTHDR: 1636 /* RFC 2292 */ 1637 if (optlen != sizeof(int)) { 1638 error = EINVAL; 1639 break; 1640 } 1641 error = soopt_to_kbuf(sopt, &optval, 1642 sizeof optval, sizeof optval); 1643 if (error) 1644 break; 1645 switch (optname) { 1646 case IPV6_2292PKTINFO: 1647 OPTSET2292(IN6P_PKTINFO); 1648 break; 1649 case IPV6_2292HOPLIMIT: 1650 OPTSET2292(IN6P_HOPLIMIT); 1651 break; 1652 case IPV6_2292HOPOPTS: 1653 /* 1654 * Check super-user privilege. 1655 * See comments for IPV6_RECVHOPOPTS. 1656 */ 1657 if (!privileged) 1658 return (EPERM); 1659 OPTSET2292(IN6P_HOPOPTS); 1660 break; 1661 case IPV6_2292DSTOPTS: 1662 if (!privileged) 1663 return (EPERM); 1664 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1665 break; 1666 case IPV6_2292RTHDR: 1667 OPTSET2292(IN6P_RTHDR); 1668 break; 1669 } 1670 break; 1671 1672 case IPV6_PKTINFO: 1673 case IPV6_HOPOPTS: 1674 case IPV6_RTHDR: 1675 case IPV6_DSTOPTS: 1676 case IPV6_RTHDRDSTOPTS: 1677 case IPV6_NEXTHOP: 1678 { 1679 /* 1680 * New advanced API (RFC3542) 1681 */ 1682 u_char *optbuf; 1683 u_char optbuf_storage[MCLBYTES]; 1684 int optlen; 1685 struct ip6_pktopts **optp; 1686 1687 /* cannot mix with RFC2292 */ 1688 if (OPTBIT(IN6P_RFC2292)) { 1689 error = EINVAL; 1690 break; 1691 } 1692 1693 /* 1694 * We only ensure valsize is not too large 1695 * here. Further validation will be done 1696 * later. 1697 */ 1698 error = soopt_to_kbuf(sopt, optbuf_storage, 1699 sizeof(optbuf_storage), 0); 1700 if (error) 1701 break; 1702 optlen = sopt->sopt_valsize; 1703 optbuf = optbuf_storage; 1704 optp = &in6p->in6p_outputopts; 1705 error = ip6_pcbopt(optname, optbuf, optlen, 1706 optp, uproto); 1707 break; 1708 } 1709 #undef OPTSET 1710 1711 case IPV6_MULTICAST_IF: 1712 case IPV6_MULTICAST_HOPS: 1713 case IPV6_MULTICAST_LOOP: 1714 case IPV6_JOIN_GROUP: 1715 case IPV6_LEAVE_GROUP: 1716 { 1717 struct mbuf *m; 1718 if (sopt->sopt_valsize > MLEN) { 1719 error = EMSGSIZE; 1720 break; 1721 } 1722 /* XXX */ 1723 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1724 if (m == NULL) { 1725 error = ENOBUFS; 1726 break; 1727 } 1728 m->m_len = sopt->sopt_valsize; 1729 error = soopt_to_kbuf(sopt, mtod(m, char *), 1730 m->m_len, m->m_len); 1731 error = ip6_setmoptions(sopt->sopt_name, 1732 &in6p->in6p_moptions, 1733 m); 1734 m_free(m); 1735 } 1736 break; 1737 1738 case IPV6_PORTRANGE: 1739 error = soopt_to_kbuf(sopt, &optval, 1740 sizeof optval, sizeof optval); 1741 if (error) 1742 break; 1743 1744 switch (optval) { 1745 case IPV6_PORTRANGE_DEFAULT: 1746 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1747 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1748 break; 1749 1750 case IPV6_PORTRANGE_HIGH: 1751 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1752 in6p->in6p_flags |= IN6P_HIGHPORT; 1753 break; 1754 1755 case IPV6_PORTRANGE_LOW: 1756 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1757 in6p->in6p_flags |= IN6P_LOWPORT; 1758 break; 1759 1760 default: 1761 error = EINVAL; 1762 break; 1763 } 1764 break; 1765 1766 #if defined(IPSEC) || defined(FAST_IPSEC) 1767 case IPV6_IPSEC_POLICY: 1768 { 1769 caddr_t req = NULL; 1770 size_t len = 0; 1771 struct mbuf *m; 1772 1773 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1774 break; 1775 soopt_to_mbuf(sopt, m); /* XXX */ 1776 if (m) { 1777 req = mtod(m, caddr_t); 1778 len = m->m_len; 1779 } 1780 error = ipsec6_set_policy(in6p, optname, req, 1781 len, privileged); 1782 m_freem(m); 1783 } 1784 break; 1785 #endif /* KAME IPSEC */ 1786 1787 case IPV6_FW_ADD: 1788 case IPV6_FW_DEL: 1789 case IPV6_FW_FLUSH: 1790 case IPV6_FW_ZERO: 1791 { 1792 struct mbuf *m; 1793 struct mbuf **mp = &m; 1794 1795 if (ip6_fw_ctl_ptr == NULL) 1796 return EINVAL; 1797 /* XXX */ 1798 if ((error = soopt_getm(sopt, &m)) != 0) 1799 break; 1800 /* XXX */ 1801 soopt_to_mbuf(sopt, m); 1802 error = (*ip6_fw_ctl_ptr)(optname, mp); 1803 m = *mp; 1804 } 1805 break; 1806 1807 default: 1808 error = ENOPROTOOPT; 1809 break; 1810 } 1811 break; 1812 1813 case SOPT_GET: 1814 switch (optname) { 1815 case IPV6_2292PKTOPTIONS: 1816 #ifdef IPV6_PKTOPTIONS 1817 case IPV6_PKTOPTIONS: 1818 #endif 1819 /* 1820 * RFC3542 (effectively) deprecated the 1821 * semantics of the 2292-style pktoptions. 1822 * Since it was not reliable in nature (i.e., 1823 * applications had to expect the lack of some 1824 * information after all), it would make sense 1825 * to simplify this part by always returning 1826 * empty data. 1827 */ 1828 if (in6p->in6p_options) { 1829 struct mbuf *m; 1830 m = m_copym(in6p->in6p_options, 1831 0, M_COPYALL, MB_WAIT); 1832 error = soopt_from_mbuf(sopt, m); 1833 if (error == 0) 1834 m_freem(m); 1835 } else 1836 sopt->sopt_valsize = 0; 1837 break; 1838 1839 case IPV6_RECVHOPOPTS: 1840 case IPV6_RECVDSTOPTS: 1841 case IPV6_RECVRTHDRDSTOPTS: 1842 case IPV6_UNICAST_HOPS: 1843 case IPV6_RECVPKTINFO: 1844 case IPV6_RECVHOPLIMIT: 1845 case IPV6_RECVRTHDR: 1846 case IPV6_RECVPATHMTU: 1847 case IPV6_RECVTCLASS: 1848 case IPV6_AUTOFLOWLABEL: 1849 case IPV6_FAITH: 1850 case IPV6_V6ONLY: 1851 case IPV6_PORTRANGE: 1852 switch (optname) { 1853 1854 case IPV6_RECVHOPOPTS: 1855 optval = OPTBIT(IN6P_HOPOPTS); 1856 break; 1857 1858 case IPV6_RECVDSTOPTS: 1859 optval = OPTBIT(IN6P_DSTOPTS); 1860 break; 1861 1862 case IPV6_RECVRTHDRDSTOPTS: 1863 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1864 break; 1865 1866 case IPV6_RECVPKTINFO: 1867 optval = OPTBIT(IN6P_PKTINFO); 1868 break; 1869 1870 case IPV6_RECVHOPLIMIT: 1871 optval = OPTBIT(IN6P_HOPLIMIT); 1872 break; 1873 1874 case IPV6_RECVRTHDR: 1875 optval = OPTBIT(IN6P_RTHDR); 1876 break; 1877 1878 case IPV6_RECVPATHMTU: 1879 optval = OPTBIT(IN6P_MTU); 1880 break; 1881 1882 case IPV6_RECVTCLASS: 1883 optval = OPTBIT(IN6P_TCLASS); 1884 break; 1885 1886 case IPV6_AUTOFLOWLABEL: 1887 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1888 break; 1889 1890 1891 case IPV6_UNICAST_HOPS: 1892 optval = in6p->in6p_hops; 1893 break; 1894 1895 case IPV6_FAITH: 1896 optval = OPTBIT(IN6P_FAITH); 1897 break; 1898 1899 case IPV6_V6ONLY: 1900 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1901 break; 1902 1903 case IPV6_PORTRANGE: 1904 { 1905 int flags; 1906 flags = in6p->in6p_flags; 1907 if (flags & IN6P_HIGHPORT) 1908 optval = IPV6_PORTRANGE_HIGH; 1909 else if (flags & IN6P_LOWPORT) 1910 optval = IPV6_PORTRANGE_LOW; 1911 else 1912 optval = 0; 1913 break; 1914 } 1915 } 1916 soopt_from_kbuf(sopt, &optval, 1917 sizeof optval); 1918 break; 1919 1920 case IPV6_PATHMTU: 1921 { 1922 u_long pmtu = 0; 1923 struct ip6_mtuinfo mtuinfo; 1924 struct route_in6 sro; 1925 1926 bzero(&sro, sizeof(sro)); 1927 1928 if (!(so->so_state & SS_ISCONNECTED)) 1929 return (ENOTCONN); 1930 /* 1931 * XXX: we dot not consider the case of source 1932 * routing, or optional information to specify 1933 * the outgoing interface. 1934 */ 1935 error = ip6_getpmtu(&sro, NULL, NULL, 1936 &in6p->in6p_faddr, &pmtu, NULL); 1937 if (sro.ro_rt) 1938 RTFREE(sro.ro_rt); 1939 if (error) 1940 break; 1941 if (pmtu > IPV6_MAXPACKET) 1942 pmtu = IPV6_MAXPACKET; 1943 1944 bzero(&mtuinfo, sizeof(mtuinfo)); 1945 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1946 optdata = (void *)&mtuinfo; 1947 optdatalen = sizeof(mtuinfo); 1948 soopt_from_kbuf(sopt, optdata, 1949 optdatalen); 1950 break; 1951 } 1952 1953 case IPV6_2292PKTINFO: 1954 case IPV6_2292HOPLIMIT: 1955 case IPV6_2292HOPOPTS: 1956 case IPV6_2292RTHDR: 1957 case IPV6_2292DSTOPTS: 1958 if (optname == IPV6_2292HOPOPTS || 1959 optname == IPV6_2292DSTOPTS || 1960 !privileged) 1961 return (EPERM); 1962 switch (optname) { 1963 case IPV6_2292PKTINFO: 1964 optval = OPTBIT(IN6P_PKTINFO); 1965 break; 1966 case IPV6_2292HOPLIMIT: 1967 optval = OPTBIT(IN6P_HOPLIMIT); 1968 break; 1969 case IPV6_2292HOPOPTS: 1970 if (!privileged) 1971 return (EPERM); 1972 optval = OPTBIT(IN6P_HOPOPTS); 1973 break; 1974 case IPV6_2292RTHDR: 1975 optval = OPTBIT(IN6P_RTHDR); 1976 break; 1977 case IPV6_2292DSTOPTS: 1978 if (!privileged) 1979 return (EPERM); 1980 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1981 break; 1982 } 1983 soopt_from_kbuf(sopt, &optval, 1984 sizeof optval); 1985 break; 1986 1987 case IPV6_PKTINFO: 1988 case IPV6_HOPOPTS: 1989 case IPV6_RTHDR: 1990 case IPV6_DSTOPTS: 1991 case IPV6_RTHDRDSTOPTS: 1992 case IPV6_NEXTHOP: 1993 case IPV6_TCLASS: 1994 case IPV6_DONTFRAG: 1995 case IPV6_USE_MIN_MTU: 1996 case IPV6_PREFER_TEMPADDR: 1997 error = ip6_getpcbopt(in6p->in6p_outputopts, 1998 optname, sopt); 1999 break; 2000 2001 case IPV6_MULTICAST_IF: 2002 case IPV6_MULTICAST_HOPS: 2003 case IPV6_MULTICAST_LOOP: 2004 case IPV6_JOIN_GROUP: 2005 case IPV6_LEAVE_GROUP: 2006 { 2007 struct mbuf *m; 2008 error = ip6_getmoptions(sopt->sopt_name, 2009 in6p->in6p_moptions, &m); 2010 if (error == 0) 2011 soopt_from_kbuf(sopt, 2012 mtod(m, char *), m->m_len); 2013 m_freem(m); 2014 } 2015 break; 2016 2017 #if defined(IPSEC) || defined(FAST_IPSEC) 2018 case IPV6_IPSEC_POLICY: 2019 { 2020 caddr_t req = NULL; 2021 size_t len = 0; 2022 struct mbuf *m = NULL; 2023 struct mbuf **mp = &m; 2024 2025 error = soopt_getm(sopt, &m); /* XXX */ 2026 if (error != 0) 2027 break; 2028 soopt_to_mbuf(sopt, m); /* XXX */ 2029 if (m) { 2030 req = mtod(m, caddr_t); 2031 len = m->m_len; 2032 } 2033 error = ipsec6_get_policy(in6p, req, len, mp); 2034 if (error == 0) 2035 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2036 if (error == 0 && m != NULL) 2037 m_freem(m); 2038 break; 2039 } 2040 #endif /* KAME IPSEC */ 2041 2042 case IPV6_FW_GET: 2043 { 2044 struct mbuf *m; 2045 struct mbuf **mp = &m; 2046 2047 if (ip6_fw_ctl_ptr == NULL) 2048 { 2049 return EINVAL; 2050 } 2051 error = (*ip6_fw_ctl_ptr)(optname, mp); 2052 if (error == 0) 2053 error = soopt_from_mbuf(sopt, m); /* XXX */ 2054 if (error == 0 && m != NULL) 2055 m_freem(m); 2056 } 2057 break; 2058 2059 default: 2060 error = ENOPROTOOPT; 2061 break; 2062 } 2063 break; 2064 } 2065 } else { 2066 error = EINVAL; 2067 } 2068 return (error); 2069 } 2070 2071 int 2072 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2073 { 2074 int error = 0, optval, optlen; 2075 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2076 struct in6pcb *in6p = sotoin6pcb(so); 2077 int level, op, optname; 2078 2079 if (sopt) { 2080 level = sopt->sopt_level; 2081 op = sopt->sopt_dir; 2082 optname = sopt->sopt_name; 2083 optlen = sopt->sopt_valsize; 2084 } else 2085 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2086 2087 if (level != IPPROTO_IPV6) { 2088 return (EINVAL); 2089 } 2090 2091 switch (optname) { 2092 case IPV6_CHECKSUM: 2093 /* 2094 * For ICMPv6 sockets, no modification allowed for checksum 2095 * offset, permit "no change" values to help existing apps. 2096 * 2097 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2098 * for an ICMPv6 socket will fail." 2099 * The current behavior does not meet RFC3542. 2100 */ 2101 switch (op) { 2102 case SOPT_SET: 2103 if (optlen != sizeof(int)) { 2104 error = EINVAL; 2105 break; 2106 } 2107 error = soopt_to_kbuf(sopt, &optval, 2108 sizeof optval, sizeof optval); 2109 if (error) 2110 break; 2111 if ((optval % 2) != 0) { 2112 /* the API assumes even offset values */ 2113 error = EINVAL; 2114 } else if (so->so_proto->pr_protocol == 2115 IPPROTO_ICMPV6) { 2116 if (optval != icmp6off) 2117 error = EINVAL; 2118 } else 2119 in6p->in6p_cksum = optval; 2120 break; 2121 2122 case SOPT_GET: 2123 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2124 optval = icmp6off; 2125 else 2126 optval = in6p->in6p_cksum; 2127 2128 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2129 break; 2130 2131 default: 2132 error = EINVAL; 2133 break; 2134 } 2135 break; 2136 2137 default: 2138 error = ENOPROTOOPT; 2139 break; 2140 } 2141 2142 return (error); 2143 } 2144 2145 /* 2146 * Set up IP6 options in pcb for insertion in output packets or 2147 * specifying behavior of outgoing packets. 2148 */ 2149 static int 2150 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2151 struct socket *so, struct sockopt *sopt) 2152 { 2153 int priv = 0; 2154 struct ip6_pktopts *opt = *pktopt; 2155 int error = 0; 2156 2157 /* turn off any old options. */ 2158 if (opt) { 2159 #ifdef DIAGNOSTIC 2160 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2161 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2162 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2163 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2164 #endif 2165 ip6_clearpktopts(opt, -1); 2166 } else 2167 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2168 *pktopt = NULL; 2169 2170 if (!m || m->m_len == 0) { 2171 /* 2172 * Only turning off any previous options, regardless of 2173 * whether the opt is just created or given. 2174 */ 2175 kfree(opt, M_IP6OPT); 2176 return (0); 2177 } 2178 2179 /* set options specified by user. */ 2180 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2181 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2182 kfree(opt, M_IP6OPT); 2183 return (error); 2184 } 2185 *pktopt = opt; 2186 return (0); 2187 } 2188 2189 2190 /* 2191 * Below three functions are introduced by merge to RFC3542 2192 */ 2193 2194 static int 2195 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2196 { 2197 void *optdata = NULL; 2198 int optdatalen = 0; 2199 struct ip6_ext *ip6e; 2200 int error = 0; 2201 struct in6_pktinfo null_pktinfo; 2202 int deftclass = 0, on; 2203 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2204 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2205 2206 switch (optname) { 2207 case IPV6_PKTINFO: 2208 if (pktopt && pktopt->ip6po_pktinfo) 2209 optdata = (void *)pktopt->ip6po_pktinfo; 2210 else { 2211 /* XXX: we don't have to do this every time... */ 2212 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2213 optdata = (void *)&null_pktinfo; 2214 } 2215 optdatalen = sizeof(struct in6_pktinfo); 2216 break; 2217 case IPV6_TCLASS: 2218 if (pktopt && pktopt->ip6po_tclass >= 0) 2219 optdata = (void *)&pktopt->ip6po_tclass; 2220 else 2221 optdata = (void *)&deftclass; 2222 optdatalen = sizeof(int); 2223 break; 2224 case IPV6_HOPOPTS: 2225 if (pktopt && pktopt->ip6po_hbh) { 2226 optdata = (void *)pktopt->ip6po_hbh; 2227 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2228 optdatalen = (ip6e->ip6e_len + 1) << 3; 2229 } 2230 break; 2231 case IPV6_RTHDR: 2232 if (pktopt && pktopt->ip6po_rthdr) { 2233 optdata = (void *)pktopt->ip6po_rthdr; 2234 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2235 optdatalen = (ip6e->ip6e_len + 1) << 3; 2236 } 2237 break; 2238 case IPV6_RTHDRDSTOPTS: 2239 if (pktopt && pktopt->ip6po_dest1) { 2240 optdata = (void *)pktopt->ip6po_dest1; 2241 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2242 optdatalen = (ip6e->ip6e_len + 1) << 3; 2243 } 2244 break; 2245 case IPV6_DSTOPTS: 2246 if (pktopt && pktopt->ip6po_dest2) { 2247 optdata = (void *)pktopt->ip6po_dest2; 2248 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2249 optdatalen = (ip6e->ip6e_len + 1) << 3; 2250 } 2251 break; 2252 case IPV6_NEXTHOP: 2253 if (pktopt && pktopt->ip6po_nexthop) { 2254 optdata = (void *)pktopt->ip6po_nexthop; 2255 optdatalen = pktopt->ip6po_nexthop->sa_len; 2256 } 2257 break; 2258 case IPV6_USE_MIN_MTU: 2259 if (pktopt) 2260 optdata = (void *)&pktopt->ip6po_minmtu; 2261 else 2262 optdata = (void *)&defminmtu; 2263 optdatalen = sizeof(int); 2264 break; 2265 case IPV6_DONTFRAG: 2266 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2267 on = 1; 2268 else 2269 on = 0; 2270 optdata = (void *)&on; 2271 optdatalen = sizeof(on); 2272 break; 2273 case IPV6_PREFER_TEMPADDR: 2274 if (pktopt) 2275 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2276 else 2277 optdata = (void *)&defpreftemp; 2278 optdatalen = sizeof(int); 2279 break; 2280 default: /* should not happen */ 2281 #ifdef DIAGNOSTIC 2282 panic("ip6_getpcbopt: unexpected option"); 2283 #endif 2284 return (ENOPROTOOPT); 2285 } 2286 2287 soopt_from_kbuf(sopt, optdata, optdatalen); 2288 2289 return (error); 2290 } 2291 2292 /* 2293 * initialize ip6_pktopts. beware that there are non-zero default values in 2294 * the struct. 2295 */ 2296 2297 static int 2298 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2299 { 2300 struct ip6_pktopts *opt; 2301 int priv =0; 2302 if (*pktopt == NULL) { 2303 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2304 init_ip6pktopts(*pktopt); 2305 } 2306 opt = *pktopt; 2307 2308 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2309 } 2310 2311 /* 2312 * initialize ip6_pktopts. beware that there are non-zero default values in 2313 * the struct. 2314 */ 2315 void 2316 init_ip6pktopts(struct ip6_pktopts *opt) 2317 { 2318 2319 bzero(opt, sizeof(*opt)); 2320 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2321 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2322 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2323 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2324 } 2325 2326 void 2327 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2328 { 2329 if (pktopt == NULL) 2330 return; 2331 2332 if (optname == -1 || optname == IPV6_PKTINFO) { 2333 if (pktopt->ip6po_pktinfo) 2334 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2335 pktopt->ip6po_pktinfo = NULL; 2336 } 2337 if (optname == -1 || optname == IPV6_HOPLIMIT) 2338 pktopt->ip6po_hlim = -1; 2339 if (optname == -1 || optname == IPV6_TCLASS) 2340 pktopt->ip6po_tclass = -1; 2341 if (optname == -1 || optname == IPV6_NEXTHOP) { 2342 if (pktopt->ip6po_nextroute.ro_rt) { 2343 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2344 pktopt->ip6po_nextroute.ro_rt = NULL; 2345 } 2346 if (pktopt->ip6po_nexthop) 2347 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2348 pktopt->ip6po_nexthop = NULL; 2349 } 2350 if (optname == -1 || optname == IPV6_HOPOPTS) { 2351 if (pktopt->ip6po_hbh) 2352 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2353 pktopt->ip6po_hbh = NULL; 2354 } 2355 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2356 if (pktopt->ip6po_dest1) 2357 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2358 pktopt->ip6po_dest1 = NULL; 2359 } 2360 if (optname == -1 || optname == IPV6_RTHDR) { 2361 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2362 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2363 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2364 if (pktopt->ip6po_route.ro_rt) { 2365 RTFREE(pktopt->ip6po_route.ro_rt); 2366 pktopt->ip6po_route.ro_rt = NULL; 2367 } 2368 } 2369 if (optname == -1 || optname == IPV6_DSTOPTS) { 2370 if (pktopt->ip6po_dest2) 2371 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2372 pktopt->ip6po_dest2 = NULL; 2373 } 2374 } 2375 2376 #define PKTOPT_EXTHDRCPY(type) \ 2377 do {\ 2378 if (src->type) {\ 2379 int hlen =\ 2380 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2381 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2382 if (dst->type == NULL)\ 2383 goto bad;\ 2384 bcopy(src->type, dst->type, hlen);\ 2385 }\ 2386 } while (0) 2387 2388 struct ip6_pktopts * 2389 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2390 { 2391 struct ip6_pktopts *dst; 2392 2393 if (src == NULL) { 2394 kprintf("ip6_clearpktopts: invalid argument\n"); 2395 return (NULL); 2396 } 2397 2398 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2399 if (dst == NULL) 2400 return (NULL); 2401 2402 dst->ip6po_hlim = src->ip6po_hlim; 2403 if (src->ip6po_pktinfo) { 2404 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2405 M_IP6OPT, canwait); 2406 if (dst->ip6po_pktinfo == NULL) 2407 goto bad; 2408 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2409 } 2410 if (src->ip6po_nexthop) { 2411 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2412 M_IP6OPT, canwait); 2413 if (dst->ip6po_nexthop == NULL) 2414 goto bad; 2415 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2416 src->ip6po_nexthop->sa_len); 2417 } 2418 PKTOPT_EXTHDRCPY(ip6po_hbh); 2419 PKTOPT_EXTHDRCPY(ip6po_dest1); 2420 PKTOPT_EXTHDRCPY(ip6po_dest2); 2421 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2422 return (dst); 2423 2424 bad: 2425 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2426 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2427 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2428 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2429 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2430 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2431 kfree(dst, M_IP6OPT); 2432 return (NULL); 2433 } 2434 2435 static int 2436 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2437 { 2438 if (dst == NULL || src == NULL) { 2439 #ifdef DIAGNOSTIC 2440 kprintf("ip6_clearpktopts: invalid argument\n"); 2441 #endif 2442 return (EINVAL); 2443 } 2444 2445 dst->ip6po_hlim = src->ip6po_hlim; 2446 dst->ip6po_tclass = src->ip6po_tclass; 2447 dst->ip6po_flags = src->ip6po_flags; 2448 if (src->ip6po_pktinfo) { 2449 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2450 M_IP6OPT, canwait); 2451 if (dst->ip6po_pktinfo == NULL) 2452 goto bad; 2453 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2454 } 2455 if (src->ip6po_nexthop) { 2456 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2457 M_IP6OPT, canwait); 2458 if (dst->ip6po_nexthop == NULL) 2459 goto bad; 2460 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2461 src->ip6po_nexthop->sa_len); 2462 } 2463 PKTOPT_EXTHDRCPY(ip6po_hbh); 2464 PKTOPT_EXTHDRCPY(ip6po_dest1); 2465 PKTOPT_EXTHDRCPY(ip6po_dest2); 2466 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2467 return (0); 2468 2469 bad: 2470 ip6_clearpktopts(dst, -1); 2471 return (ENOBUFS); 2472 } 2473 #undef PKTOPT_EXTHDRCPY 2474 2475 void 2476 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2477 { 2478 if (pktopt == NULL) 2479 return; 2480 2481 ip6_clearpktopts(pktopt, -1); 2482 2483 kfree(pktopt, M_IP6OPT); 2484 } 2485 2486 /* 2487 * Set the IP6 multicast options in response to user setsockopt(). 2488 */ 2489 static int 2490 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2491 { 2492 int error = 0; 2493 u_int loop, ifindex; 2494 struct ipv6_mreq *mreq; 2495 struct ifnet *ifp; 2496 struct ip6_moptions *im6o = *im6op; 2497 struct route_in6 ro; 2498 struct sockaddr_in6 *dst; 2499 struct in6_multi_mship *imm; 2500 struct thread *td = curthread; /* XXX */ 2501 2502 if (im6o == NULL) { 2503 /* 2504 * No multicast option buffer attached to the pcb; 2505 * allocate one and initialize to default values. 2506 */ 2507 im6o = (struct ip6_moptions *) 2508 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2509 2510 *im6op = im6o; 2511 im6o->im6o_multicast_ifp = NULL; 2512 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2513 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2514 LIST_INIT(&im6o->im6o_memberships); 2515 } 2516 2517 switch (optname) { 2518 2519 case IPV6_MULTICAST_IF: 2520 /* 2521 * Select the interface for outgoing multicast packets. 2522 */ 2523 if (m == NULL || m->m_len != sizeof(u_int)) { 2524 error = EINVAL; 2525 break; 2526 } 2527 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2528 if (ifindex < 0 || if_index < ifindex) { 2529 error = ENXIO; /* XXX EINVAL? */ 2530 break; 2531 } 2532 ifp = ifindex2ifnet[ifindex]; 2533 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2534 error = EADDRNOTAVAIL; 2535 break; 2536 } 2537 im6o->im6o_multicast_ifp = ifp; 2538 break; 2539 2540 case IPV6_MULTICAST_HOPS: 2541 { 2542 /* 2543 * Set the IP6 hoplimit for outgoing multicast packets. 2544 */ 2545 int optval; 2546 if (m == NULL || m->m_len != sizeof(int)) { 2547 error = EINVAL; 2548 break; 2549 } 2550 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2551 if (optval < -1 || optval >= 256) 2552 error = EINVAL; 2553 else if (optval == -1) 2554 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2555 else 2556 im6o->im6o_multicast_hlim = optval; 2557 break; 2558 } 2559 2560 case IPV6_MULTICAST_LOOP: 2561 /* 2562 * Set the loopback flag for outgoing multicast packets. 2563 * Must be zero or one. 2564 */ 2565 if (m == NULL || m->m_len != sizeof(u_int)) { 2566 error = EINVAL; 2567 break; 2568 } 2569 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2570 if (loop > 1) { 2571 error = EINVAL; 2572 break; 2573 } 2574 im6o->im6o_multicast_loop = loop; 2575 break; 2576 2577 case IPV6_JOIN_GROUP: 2578 /* 2579 * Add a multicast group membership. 2580 * Group must be a valid IP6 multicast address. 2581 */ 2582 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2583 error = EINVAL; 2584 break; 2585 } 2586 mreq = mtod(m, struct ipv6_mreq *); 2587 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2588 /* 2589 * We use the unspecified address to specify to accept 2590 * all multicast addresses. Only super user is allowed 2591 * to do this. 2592 */ 2593 if (priv_check(td, PRIV_ROOT)) 2594 { 2595 error = EACCES; 2596 break; 2597 } 2598 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2599 error = EINVAL; 2600 break; 2601 } 2602 2603 /* 2604 * If the interface is specified, validate it. 2605 */ 2606 if (mreq->ipv6mr_interface < 0 2607 || if_index < mreq->ipv6mr_interface) { 2608 error = ENXIO; /* XXX EINVAL? */ 2609 break; 2610 } 2611 /* 2612 * If no interface was explicitly specified, choose an 2613 * appropriate one according to the given multicast address. 2614 */ 2615 if (mreq->ipv6mr_interface == 0) { 2616 /* 2617 * If the multicast address is in node-local scope, 2618 * the interface should be a loopback interface. 2619 * Otherwise, look up the routing table for the 2620 * address, and choose the outgoing interface. 2621 * XXX: is it a good approach? 2622 */ 2623 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2624 ifp = &loif[0]; 2625 } else { 2626 ro.ro_rt = NULL; 2627 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2628 bzero(dst, sizeof(*dst)); 2629 dst->sin6_len = sizeof(struct sockaddr_in6); 2630 dst->sin6_family = AF_INET6; 2631 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2632 rtalloc((struct route *)&ro); 2633 if (ro.ro_rt == NULL) { 2634 error = EADDRNOTAVAIL; 2635 break; 2636 } 2637 ifp = ro.ro_rt->rt_ifp; 2638 rtfree(ro.ro_rt); 2639 } 2640 } else 2641 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2642 2643 /* 2644 * See if we found an interface, and confirm that it 2645 * supports multicast 2646 */ 2647 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2648 error = EADDRNOTAVAIL; 2649 break; 2650 } 2651 /* 2652 * Put interface index into the multicast address, 2653 * if the address has link-local scope. 2654 */ 2655 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2656 mreq->ipv6mr_multiaddr.s6_addr16[1] 2657 = htons(mreq->ipv6mr_interface); 2658 } 2659 /* 2660 * See if the membership already exists. 2661 */ 2662 for (imm = im6o->im6o_memberships.lh_first; 2663 imm != NULL; imm = imm->i6mm_chain.le_next) 2664 if (imm->i6mm_maddr->in6m_ifp == ifp && 2665 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2666 &mreq->ipv6mr_multiaddr)) 2667 break; 2668 if (imm != NULL) { 2669 error = EADDRINUSE; 2670 break; 2671 } 2672 /* 2673 * Everything looks good; add a new record to the multicast 2674 * address list for the given interface. 2675 */ 2676 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2677 if ((imm->i6mm_maddr = 2678 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2679 kfree(imm, M_IPMADDR); 2680 break; 2681 } 2682 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2683 break; 2684 2685 case IPV6_LEAVE_GROUP: 2686 /* 2687 * Drop a multicast group membership. 2688 * Group must be a valid IP6 multicast address. 2689 */ 2690 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2691 error = EINVAL; 2692 break; 2693 } 2694 mreq = mtod(m, struct ipv6_mreq *); 2695 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2696 if (priv_check(td, PRIV_ROOT)) { 2697 error = EACCES; 2698 break; 2699 } 2700 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2701 error = EINVAL; 2702 break; 2703 } 2704 /* 2705 * If an interface address was specified, get a pointer 2706 * to its ifnet structure. 2707 */ 2708 if (mreq->ipv6mr_interface < 0 2709 || if_index < mreq->ipv6mr_interface) { 2710 error = ENXIO; /* XXX EINVAL? */ 2711 break; 2712 } 2713 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2714 /* 2715 * Put interface index into the multicast address, 2716 * if the address has link-local scope. 2717 */ 2718 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2719 mreq->ipv6mr_multiaddr.s6_addr16[1] 2720 = htons(mreq->ipv6mr_interface); 2721 } 2722 /* 2723 * Find the membership in the membership list. 2724 */ 2725 for (imm = im6o->im6o_memberships.lh_first; 2726 imm != NULL; imm = imm->i6mm_chain.le_next) { 2727 if ((ifp == NULL || 2728 imm->i6mm_maddr->in6m_ifp == ifp) && 2729 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2730 &mreq->ipv6mr_multiaddr)) 2731 break; 2732 } 2733 if (imm == NULL) { 2734 /* Unable to resolve interface */ 2735 error = EADDRNOTAVAIL; 2736 break; 2737 } 2738 /* 2739 * Give up the multicast address record to which the 2740 * membership points. 2741 */ 2742 LIST_REMOVE(imm, i6mm_chain); 2743 in6_delmulti(imm->i6mm_maddr); 2744 kfree(imm, M_IPMADDR); 2745 break; 2746 2747 default: 2748 error = EOPNOTSUPP; 2749 break; 2750 } 2751 2752 /* 2753 * If all options have default values, no need to keep the mbuf. 2754 */ 2755 if (im6o->im6o_multicast_ifp == NULL && 2756 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2757 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2758 im6o->im6o_memberships.lh_first == NULL) { 2759 kfree(*im6op, M_IPMOPTS); 2760 *im6op = NULL; 2761 } 2762 2763 return (error); 2764 } 2765 2766 /* 2767 * Return the IP6 multicast options in response to user getsockopt(). 2768 */ 2769 static int 2770 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2771 { 2772 u_int *hlim, *loop, *ifindex; 2773 2774 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2775 2776 switch (optname) { 2777 2778 case IPV6_MULTICAST_IF: 2779 ifindex = mtod(*mp, u_int *); 2780 (*mp)->m_len = sizeof(u_int); 2781 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2782 *ifindex = 0; 2783 else 2784 *ifindex = im6o->im6o_multicast_ifp->if_index; 2785 return (0); 2786 2787 case IPV6_MULTICAST_HOPS: 2788 hlim = mtod(*mp, u_int *); 2789 (*mp)->m_len = sizeof(u_int); 2790 if (im6o == NULL) 2791 *hlim = ip6_defmcasthlim; 2792 else 2793 *hlim = im6o->im6o_multicast_hlim; 2794 return (0); 2795 2796 case IPV6_MULTICAST_LOOP: 2797 loop = mtod(*mp, u_int *); 2798 (*mp)->m_len = sizeof(u_int); 2799 if (im6o == NULL) 2800 *loop = ip6_defmcasthlim; 2801 else 2802 *loop = im6o->im6o_multicast_loop; 2803 return (0); 2804 2805 default: 2806 return (EOPNOTSUPP); 2807 } 2808 } 2809 2810 /* 2811 * Discard the IP6 multicast options. 2812 */ 2813 void 2814 ip6_freemoptions(struct ip6_moptions *im6o) 2815 { 2816 struct in6_multi_mship *imm; 2817 2818 if (im6o == NULL) 2819 return; 2820 2821 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2822 LIST_REMOVE(imm, i6mm_chain); 2823 if (imm->i6mm_maddr) 2824 in6_delmulti(imm->i6mm_maddr); 2825 kfree(imm, M_IPMADDR); 2826 } 2827 kfree(im6o, M_IPMOPTS); 2828 } 2829 2830 /* 2831 * Set a particular packet option, as a sticky option or an ancillary data 2832 * item. "len" can be 0 only when it's a sticky option. 2833 * We have 4 cases of combination of "sticky" and "cmsg": 2834 * "sticky=0, cmsg=0": impossible 2835 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2836 * "sticky=1, cmsg=0": RFC3542 socket option 2837 * "sticky=1, cmsg=1": RFC2292 socket option 2838 */ 2839 static int 2840 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2841 int sticky, int cmsg, int uproto, int priv) 2842 { 2843 int minmtupolicy, preftemp; 2844 //int error; 2845 2846 if (!sticky && !cmsg) { 2847 kprintf("ip6_setpktoption: impossible case\n"); 2848 return (EINVAL); 2849 } 2850 2851 /* 2852 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2853 * not be specified in the context of RFC3542. Conversely, 2854 * RFC3542 types should not be specified in the context of RFC2292. 2855 */ 2856 if (!cmsg) { 2857 switch (optname) { 2858 case IPV6_2292PKTINFO: 2859 case IPV6_2292HOPLIMIT: 2860 case IPV6_2292NEXTHOP: 2861 case IPV6_2292HOPOPTS: 2862 case IPV6_2292DSTOPTS: 2863 case IPV6_2292RTHDR: 2864 case IPV6_2292PKTOPTIONS: 2865 return (ENOPROTOOPT); 2866 } 2867 } 2868 if (sticky && cmsg) { 2869 switch (optname) { 2870 case IPV6_PKTINFO: 2871 case IPV6_HOPLIMIT: 2872 case IPV6_NEXTHOP: 2873 case IPV6_HOPOPTS: 2874 case IPV6_DSTOPTS: 2875 case IPV6_RTHDRDSTOPTS: 2876 case IPV6_RTHDR: 2877 case IPV6_USE_MIN_MTU: 2878 case IPV6_DONTFRAG: 2879 case IPV6_TCLASS: 2880 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2881 return (ENOPROTOOPT); 2882 } 2883 } 2884 2885 switch (optname) { 2886 case IPV6_2292PKTINFO: 2887 case IPV6_PKTINFO: 2888 { 2889 struct in6_pktinfo *pktinfo; 2890 if (len != sizeof(struct in6_pktinfo)) 2891 return (EINVAL); 2892 pktinfo = (struct in6_pktinfo *)buf; 2893 2894 /* 2895 * An application can clear any sticky IPV6_PKTINFO option by 2896 * doing a "regular" setsockopt with ipi6_addr being 2897 * in6addr_any and ipi6_ifindex being zero. 2898 * [RFC 3542, Section 6] 2899 */ 2900 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2901 pktinfo->ipi6_ifindex == 0 && 2902 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2903 ip6_clearpktopts(opt, optname); 2904 break; 2905 } 2906 2907 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2908 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2909 return (EINVAL); 2910 } 2911 2912 /* validate the interface index if specified. */ 2913 if (pktinfo->ipi6_ifindex > if_index || 2914 pktinfo->ipi6_ifindex < 0) { 2915 return (ENXIO); 2916 } 2917 /* 2918 * Check if the requested source address is indeed a 2919 * unicast address assigned to the node, and can be 2920 * used as the packet's source address. 2921 */ 2922 if (opt->ip6po_pktinfo != NULL && 2923 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2924 struct in6_ifaddr *ia6; 2925 struct sockaddr_in6 sin6; 2926 2927 bzero(&sin6, sizeof(sin6)); 2928 sin6.sin6_len = sizeof(sin6); 2929 sin6.sin6_family = AF_INET6; 2930 sin6.sin6_addr = 2931 opt->ip6po_pktinfo->ipi6_addr; 2932 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2933 if (ia6 == NULL || 2934 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2935 IN6_IFF_NOTREADY)) != 0) 2936 return (EADDRNOTAVAIL); 2937 } 2938 2939 /* 2940 * We store the address anyway, and let in6_selectsrc() 2941 * validate the specified address. This is because ipi6_addr 2942 * may not have enough information about its scope zone, and 2943 * we may need additional information (such as outgoing 2944 * interface or the scope zone of a destination address) to 2945 * disambiguate the scope. 2946 * XXX: the delay of the validation may confuse the 2947 * application when it is used as a sticky option. 2948 */ 2949 if (opt->ip6po_pktinfo == NULL) { 2950 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2951 M_IP6OPT, M_NOWAIT); 2952 if (opt->ip6po_pktinfo == NULL) 2953 return (ENOBUFS); 2954 } 2955 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2956 break; 2957 } 2958 2959 case IPV6_2292HOPLIMIT: 2960 case IPV6_HOPLIMIT: 2961 { 2962 int *hlimp; 2963 2964 /* 2965 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2966 * to simplify the ordering among hoplimit options. 2967 */ 2968 if (optname == IPV6_HOPLIMIT && sticky) 2969 return (ENOPROTOOPT); 2970 2971 if (len != sizeof(int)) 2972 return (EINVAL); 2973 hlimp = (int *)buf; 2974 if (*hlimp < -1 || *hlimp > 255) 2975 return (EINVAL); 2976 2977 opt->ip6po_hlim = *hlimp; 2978 break; 2979 } 2980 2981 case IPV6_TCLASS: 2982 { 2983 int tclass; 2984 2985 if (len != sizeof(int)) 2986 return (EINVAL); 2987 tclass = *(int *)buf; 2988 if (tclass < -1 || tclass > 255) 2989 return (EINVAL); 2990 2991 opt->ip6po_tclass = tclass; 2992 break; 2993 } 2994 2995 case IPV6_2292NEXTHOP: 2996 case IPV6_NEXTHOP: 2997 if (!priv) 2998 return (EPERM); 2999 3000 if (len == 0) { /* just remove the option */ 3001 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3002 break; 3003 } 3004 3005 /* check if cmsg_len is large enough for sa_len */ 3006 if (len < sizeof(struct sockaddr) || len < *buf) 3007 return (EINVAL); 3008 3009 switch (((struct sockaddr *)buf)->sa_family) { 3010 case AF_INET6: 3011 { 3012 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3013 //int error; 3014 3015 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3016 return (EINVAL); 3017 3018 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3019 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3020 return (EINVAL); 3021 } 3022 break; 3023 } 3024 case AF_LINK: /* should eventually be supported */ 3025 default: 3026 return (EAFNOSUPPORT); 3027 } 3028 3029 /* turn off the previous option, then set the new option. */ 3030 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3031 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3032 if (opt->ip6po_nexthop == NULL) 3033 return (ENOBUFS); 3034 bcopy(buf, opt->ip6po_nexthop, *buf); 3035 break; 3036 3037 case IPV6_2292HOPOPTS: 3038 case IPV6_HOPOPTS: 3039 { 3040 struct ip6_hbh *hbh; 3041 int hbhlen; 3042 3043 /* 3044 * XXX: We don't allow a non-privileged user to set ANY HbH 3045 * options, since per-option restriction has too much 3046 * overhead. 3047 */ 3048 if (!priv) 3049 return (EPERM); 3050 if (len == 0) { 3051 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3052 break; /* just remove the option */ 3053 } 3054 3055 /* message length validation */ 3056 if (len < sizeof(struct ip6_hbh)) 3057 return (EINVAL); 3058 hbh = (struct ip6_hbh *)buf; 3059 hbhlen = (hbh->ip6h_len + 1) << 3; 3060 if (len != hbhlen) 3061 return (EINVAL); 3062 3063 /* turn off the previous option, then set the new option. */ 3064 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3065 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3066 if (opt->ip6po_hbh == NULL) 3067 return (ENOBUFS); 3068 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3069 3070 break; 3071 } 3072 3073 case IPV6_2292DSTOPTS: 3074 case IPV6_DSTOPTS: 3075 case IPV6_RTHDRDSTOPTS: 3076 { 3077 struct ip6_dest *dest, **newdest = NULL; 3078 int destlen; 3079 if (!priv) 3080 return (EPERM); 3081 3082 if (len == 0) { 3083 ip6_clearpktopts(opt, optname); 3084 break; /* just remove the option */ 3085 } 3086 3087 /* message length validation */ 3088 if (len < sizeof(struct ip6_dest)) 3089 return (EINVAL); 3090 dest = (struct ip6_dest *)buf; 3091 destlen = (dest->ip6d_len + 1) << 3; 3092 if (len != destlen) 3093 return (EINVAL); 3094 3095 /* 3096 * Determine the position that the destination options header 3097 * should be inserted; before or after the routing header. 3098 */ 3099 switch (optname) { 3100 case IPV6_2292DSTOPTS: 3101 /* 3102 * The old advacned API is ambiguous on this point. 3103 * Our approach is to determine the position based 3104 * according to the existence of a routing header. 3105 * Note, however, that this depends on the order of the 3106 * extension headers in the ancillary data; the 1st 3107 * part of the destination options header must appear 3108 * before the routing header in the ancillary data, 3109 * too. 3110 * RFC3542 solved the ambiguity by introducing 3111 * separate ancillary data or option types. 3112 */ 3113 if (opt->ip6po_rthdr == NULL) 3114 newdest = &opt->ip6po_dest1; 3115 else 3116 newdest = &opt->ip6po_dest2; 3117 break; 3118 case IPV6_RTHDRDSTOPTS: 3119 newdest = &opt->ip6po_dest1; 3120 break; 3121 case IPV6_DSTOPTS: 3122 newdest = &opt->ip6po_dest2; 3123 break; 3124 } 3125 3126 /* turn off the previous option, then set the new option. */ 3127 ip6_clearpktopts(opt, optname); 3128 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3129 if (*newdest == NULL) 3130 return (ENOBUFS); 3131 bcopy(dest, *newdest, destlen); 3132 3133 break; 3134 } 3135 3136 case IPV6_2292RTHDR: 3137 case IPV6_RTHDR: 3138 { 3139 struct ip6_rthdr *rth; 3140 int rthlen; 3141 3142 if (len == 0) { 3143 ip6_clearpktopts(opt, IPV6_RTHDR); 3144 break; /* just remove the option */ 3145 } 3146 3147 /* message length validation */ 3148 if (len < sizeof(struct ip6_rthdr)) 3149 return (EINVAL); 3150 rth = (struct ip6_rthdr *)buf; 3151 rthlen = (rth->ip6r_len + 1) << 3; 3152 if (len != rthlen) 3153 return (EINVAL); 3154 3155 switch (rth->ip6r_type) { 3156 default: 3157 return (EINVAL); /* not supported */ 3158 } 3159 3160 /* turn off the previous option */ 3161 ip6_clearpktopts(opt, IPV6_RTHDR); 3162 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3163 if (opt->ip6po_rthdr == NULL) 3164 return (ENOBUFS); 3165 bcopy(rth, opt->ip6po_rthdr, rthlen); 3166 3167 break; 3168 } 3169 3170 case IPV6_USE_MIN_MTU: 3171 if (len != sizeof(int)) 3172 return (EINVAL); 3173 minmtupolicy = *(int *)buf; 3174 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3175 minmtupolicy != IP6PO_MINMTU_DISABLE && 3176 minmtupolicy != IP6PO_MINMTU_ALL) { 3177 return (EINVAL); 3178 } 3179 opt->ip6po_minmtu = minmtupolicy; 3180 break; 3181 3182 case IPV6_DONTFRAG: 3183 if (len != sizeof(int)) 3184 return (EINVAL); 3185 3186 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3187 /* 3188 * we ignore this option for TCP sockets. 3189 * (RFC3542 leaves this case unspecified.) 3190 */ 3191 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3192 } else 3193 opt->ip6po_flags |= IP6PO_DONTFRAG; 3194 break; 3195 3196 case IPV6_PREFER_TEMPADDR: 3197 if (len != sizeof(int)) 3198 return (EINVAL); 3199 preftemp = *(int *)buf; 3200 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3201 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3202 preftemp != IP6PO_TEMPADDR_PREFER) { 3203 return (EINVAL); 3204 } 3205 opt->ip6po_prefer_tempaddr = preftemp; 3206 break; 3207 3208 default: 3209 return (ENOPROTOOPT); 3210 } /* end of switch */ 3211 3212 return (0); 3213 } 3214 3215 3216 /* 3217 * Set IPv6 outgoing packet options based on advanced API. 3218 */ 3219 int 3220 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3221 struct ip6_pktopts *stickyopt, int uproto, int priv) 3222 { 3223 struct cmsghdr *cm = NULL; 3224 3225 if (control == NULL || opt == NULL) 3226 return (EINVAL); 3227 3228 init_ip6pktopts(opt); 3229 3230 /* 3231 * XXX: Currently, we assume all the optional information is stored 3232 * in a single mbuf. 3233 */ 3234 if (stickyopt) { 3235 int error; 3236 3237 /* 3238 * If stickyopt is provided, make a local copy of the options 3239 * for this particular packet, then override them by ancillary 3240 * objects. 3241 * XXX: copypktopts() does not copy the cached route to a next 3242 * hop (if any). This is not very good in terms of efficiency, 3243 * but we can allow this since this option should be rarely 3244 * used. 3245 */ 3246 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3247 return (error); 3248 } 3249 3250 /* 3251 * XXX: Currently, we assume all the optional information is stored 3252 * in a single mbuf. 3253 */ 3254 if (control->m_next) 3255 return (EINVAL); 3256 3257 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3258 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3259 int error; 3260 3261 if (control->m_len < CMSG_LEN(0)) 3262 return (EINVAL); 3263 3264 cm = mtod(control, struct cmsghdr *); 3265 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3266 return (EINVAL); 3267 if (cm->cmsg_level != IPPROTO_IPV6) 3268 continue; 3269 3270 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3271 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3272 if (error) 3273 return (error); 3274 } 3275 3276 return (0); 3277 } 3278 3279 /* 3280 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3281 * packet to the input queue of a specified interface. Note that this 3282 * calls the output routine of the loopback "driver", but with an interface 3283 * pointer that might NOT be &loif -- easier than replicating that code here. 3284 */ 3285 void 3286 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3287 { 3288 struct mbuf *copym; 3289 struct ip6_hdr *ip6; 3290 3291 copym = m_copy(m, 0, M_COPYALL); 3292 if (copym == NULL) 3293 return; 3294 3295 /* 3296 * Make sure to deep-copy IPv6 header portion in case the data 3297 * is in an mbuf cluster, so that we can safely override the IPv6 3298 * header portion later. 3299 */ 3300 if ((copym->m_flags & M_EXT) != 0 || 3301 copym->m_len < sizeof(struct ip6_hdr)) { 3302 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3303 if (copym == NULL) 3304 return; 3305 } 3306 3307 #ifdef DIAGNOSTIC 3308 if (copym->m_len < sizeof(*ip6)) { 3309 m_freem(copym); 3310 return; 3311 } 3312 #endif 3313 3314 ip6 = mtod(copym, struct ip6_hdr *); 3315 /* 3316 * clear embedded scope identifiers if necessary. 3317 * in6_clearscope will touch the addresses only when necessary. 3318 */ 3319 in6_clearscope(&ip6->ip6_src); 3320 in6_clearscope(&ip6->ip6_dst); 3321 3322 if_simloop(ifp, copym, dst->sin6_family, 0); 3323 } 3324 3325 /* 3326 * Separate the IPv6 header from the payload into its own mbuf. 3327 * 3328 * Returns the new mbuf chain or the original mbuf if no payload. 3329 * Returns NULL if can't allocate new mbuf for header. 3330 */ 3331 static struct mbuf * 3332 ip6_splithdr(struct mbuf *m) 3333 { 3334 struct mbuf *mh; 3335 3336 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3337 return (m); 3338 3339 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 3340 if (mh == NULL) 3341 return (NULL); 3342 mh->m_len = sizeof(struct ip6_hdr); 3343 M_MOVE_PKTHDR(mh, m); 3344 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3345 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3346 m->m_data += sizeof(struct ip6_hdr); 3347 m->m_len -= sizeof(struct ip6_hdr); 3348 mh->m_next = m; 3349 return (mh); 3350 } 3351 3352 /* 3353 * Compute IPv6 extension header length. 3354 */ 3355 int 3356 ip6_optlen(struct in6pcb *in6p) 3357 { 3358 int len; 3359 3360 if (!in6p->in6p_outputopts) 3361 return 0; 3362 3363 len = 0; 3364 #define elen(x) \ 3365 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3366 3367 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3368 if (in6p->in6p_outputopts->ip6po_rthdr) 3369 /* dest1 is valid with rthdr only */ 3370 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3371 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3372 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3373 return len; 3374 #undef elen 3375 }
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