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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include "opt_ip6fw.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/systm.h> 81 #include <sys/kernel.h> 82 #include <sys/proc.h> 83 #include <sys/priv.h> 84 85 #include <sys/thread2.h> 86 #include <sys/msgport2.h> 87 88 #include <net/if.h> 89 #include <net/route.h> 90 #include <net/pfil.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet6/in6_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet/in_pcb.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/ip6protosw.h> 101 102 #ifdef IPSEC 103 #include <netinet6/ipsec.h> 104 #ifdef INET6 105 #include <netinet6/ipsec6.h> 106 #endif 107 #include <netproto/key/key.h> 108 #endif /* IPSEC */ 109 110 #ifdef FAST_IPSEC 111 #include <netproto/ipsec/ipsec.h> 112 #include <netproto/ipsec/ipsec6.h> 113 #include <netproto/ipsec/key.h> 114 #endif 115 116 #include <net/ip6fw/ip6_fw.h> 117 118 #include <net/net_osdep.h> 119 120 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 121 122 struct ip6_exthdrs { 123 struct mbuf *ip6e_ip6; 124 struct mbuf *ip6e_hbh; 125 struct mbuf *ip6e_dest1; 126 struct mbuf *ip6e_rthdr; 127 struct mbuf *ip6e_dest2; 128 }; 129 130 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 131 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 132 int, int, int, int); 133 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 134 struct socket *, struct sockopt *); 135 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 136 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 137 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 138 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 139 struct ifnet *, struct in6_addr *, u_long *, int *); 140 static int copyexthdr (void *, struct mbuf **); 141 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 142 struct ip6_frag **); 143 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 144 static struct mbuf *ip6_splithdr (struct mbuf *); 145 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 146 147 /* 148 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 149 * header (with pri, len, nxt, hlim, src, dst). 150 * This function may modify ver and hlim only. 151 * The mbuf chain containing the packet will be freed. 152 * The mbuf opt, if present, will not be freed. 153 * 154 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 155 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 156 * which is rt_rmx.rmx_mtu. 157 */ 158 int 159 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 160 int flags, struct ip6_moptions *im6o, 161 struct ifnet **ifpp, /* XXX: just for statistics */ 162 struct inpcb *inp) 163 { 164 struct ip6_hdr *ip6, *mhip6; 165 struct ifnet *ifp, *origifp; 166 struct mbuf *m = m0; 167 struct mbuf *mprev; 168 u_char *nexthdrp; 169 int hlen, tlen, len, off; 170 struct route_in6 ip6route; 171 struct sockaddr_in6 *dst; 172 int error = 0; 173 struct in6_ifaddr *ia = NULL; 174 u_long mtu; 175 int alwaysfrag, dontfrag; 176 u_int32_t optlen, plen = 0, unfragpartlen; 177 struct ip6_exthdrs exthdrs; 178 struct in6_addr finaldst; 179 struct route_in6 *ro_pmtu = NULL; 180 boolean_t hdrsplit = FALSE; 181 boolean_t needipsec = FALSE; 182 #ifdef IPSEC 183 boolean_t needipsectun = FALSE; 184 struct secpolicy *sp = NULL; 185 struct socket *so = inp ? inp->inp_socket : NULL; 186 187 ip6 = mtod(m, struct ip6_hdr *); 188 #endif 189 #ifdef FAST_IPSEC 190 boolean_t needipsectun = FALSE; 191 struct secpolicy *sp = NULL; 192 193 ip6 = mtod(m, struct ip6_hdr *); 194 #endif 195 196 bzero(&exthdrs, sizeof exthdrs); 197 198 if (opt) { 199 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 200 goto freehdrs; 201 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 202 goto freehdrs; 203 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 204 goto freehdrs; 205 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 206 goto freehdrs; 207 } 208 209 #ifdef IPSEC 210 /* get a security policy for this packet */ 211 if (so == NULL) 212 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 213 else 214 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 215 216 if (sp == NULL) { 217 ipsec6stat.out_inval++; 218 goto freehdrs; 219 } 220 221 error = 0; 222 223 /* check policy */ 224 switch (sp->policy) { 225 case IPSEC_POLICY_DISCARD: 226 /* 227 * This packet is just discarded. 228 */ 229 ipsec6stat.out_polvio++; 230 goto freehdrs; 231 232 case IPSEC_POLICY_BYPASS: 233 case IPSEC_POLICY_NONE: 234 /* no need to do IPsec. */ 235 needipsec = FALSE; 236 break; 237 238 case IPSEC_POLICY_IPSEC: 239 if (sp->req == NULL) { 240 error = key_spdacquire(sp); /* acquire a policy */ 241 goto freehdrs; 242 } 243 needipsec = TRUE; 244 break; 245 246 case IPSEC_POLICY_ENTRUST: 247 default: 248 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 249 } 250 #endif /* IPSEC */ 251 #ifdef FAST_IPSEC 252 /* get a security policy for this packet */ 253 if (inp == NULL) 254 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 255 else 256 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 257 258 if (sp == NULL) { 259 newipsecstat.ips_out_inval++; 260 goto freehdrs; 261 } 262 263 error = 0; 264 265 /* check policy */ 266 switch (sp->policy) { 267 case IPSEC_POLICY_DISCARD: 268 /* 269 * This packet is just discarded. 270 */ 271 newipsecstat.ips_out_polvio++; 272 goto freehdrs; 273 274 case IPSEC_POLICY_BYPASS: 275 case IPSEC_POLICY_NONE: 276 /* no need to do IPsec. */ 277 needipsec = FALSE; 278 break; 279 280 case IPSEC_POLICY_IPSEC: 281 if (sp->req == NULL) { 282 error = key_spdacquire(sp); /* acquire a policy */ 283 goto freehdrs; 284 } 285 needipsec = TRUE; 286 break; 287 288 case IPSEC_POLICY_ENTRUST: 289 default: 290 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 291 } 292 #endif /* FAST_IPSEC */ 293 294 /* 295 * Calculate the total length of the extension header chain. 296 * Keep the length of the unfragmentable part for fragmentation. 297 */ 298 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 299 m_lengthm(exthdrs.ip6e_dest1, NULL) + 300 m_lengthm(exthdrs.ip6e_rthdr, NULL); 301 302 unfragpartlen = optlen + sizeof(struct ip6_hdr); 303 304 /* NOTE: we don't add AH/ESP length here. do that later. */ 305 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 306 307 /* 308 * If we need IPsec, or there is at least one extension header, 309 * separate IP6 header from the payload. 310 */ 311 if ((needipsec || optlen) && !hdrsplit) { 312 exthdrs.ip6e_ip6 = ip6_splithdr(m); 313 if (exthdrs.ip6e_ip6 == NULL) { 314 error = ENOBUFS; 315 goto freehdrs; 316 } 317 m = exthdrs.ip6e_ip6; 318 hdrsplit = TRUE; 319 } 320 321 /* adjust pointer */ 322 ip6 = mtod(m, struct ip6_hdr *); 323 324 /* adjust mbuf packet header length */ 325 m->m_pkthdr.len += optlen; 326 plen = m->m_pkthdr.len - sizeof(*ip6); 327 328 /* If this is a jumbo payload, insert a jumbo payload option. */ 329 if (plen > IPV6_MAXPACKET) { 330 if (!hdrsplit) { 331 exthdrs.ip6e_ip6 = ip6_splithdr(m); 332 if (exthdrs.ip6e_ip6 == NULL) { 333 error = ENOBUFS; 334 goto freehdrs; 335 } 336 m = exthdrs.ip6e_ip6; 337 hdrsplit = TRUE; 338 } 339 /* adjust pointer */ 340 ip6 = mtod(m, struct ip6_hdr *); 341 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 342 goto freehdrs; 343 ip6->ip6_plen = 0; 344 } else 345 ip6->ip6_plen = htons(plen); 346 347 /* 348 * Concatenate headers and fill in next header fields. 349 * Here we have, on "m" 350 * IPv6 payload 351 * and we insert headers accordingly. Finally, we should be getting: 352 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 353 * 354 * during the header composing process, "m" points to IPv6 header. 355 * "mprev" points to an extension header prior to esp. 356 */ 357 358 nexthdrp = &ip6->ip6_nxt; 359 mprev = m; 360 361 /* 362 * we treat dest2 specially. this makes IPsec processing 363 * much easier. the goal here is to make mprev point the 364 * mbuf prior to dest2. 365 * 366 * result: IPv6 dest2 payload 367 * m and mprev will point to IPv6 header. 368 */ 369 if (exthdrs.ip6e_dest2) { 370 if (!hdrsplit) 371 panic("assumption failed: hdr not split"); 372 exthdrs.ip6e_dest2->m_next = m->m_next; 373 m->m_next = exthdrs.ip6e_dest2; 374 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 375 ip6->ip6_nxt = IPPROTO_DSTOPTS; 376 } 377 378 /* 379 * Place m1 after mprev. 380 */ 381 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 382 do {\ 383 if (m1) {\ 384 if (!hdrsplit)\ 385 panic("assumption failed: hdr not split");\ 386 *mtod(m1, u_char *) = *nexthdrp;\ 387 *nexthdrp = (i);\ 388 nexthdrp = mtod(m1, u_char *);\ 389 m1->m_next = mprev->m_next;\ 390 mprev->m_next = m1;\ 391 mprev = m1;\ 392 }\ 393 } while (0) 394 395 /* 396 * result: IPv6 hbh dest1 rthdr dest2 payload 397 * m will point to IPv6 header. mprev will point to the 398 * extension header prior to dest2 (rthdr in the above case). 399 */ 400 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 401 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 402 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 403 404 #if defined(IPSEC) || defined(FAST_IPSEC) 405 if (needipsec) { 406 struct ipsec_output_state state; 407 int segleft_org = 0; 408 struct ip6_rthdr *rh = NULL; 409 410 /* 411 * pointers after IPsec headers are not valid any more. 412 * other pointers need a great care too. 413 * (IPsec routines should not mangle mbufs prior to AH/ESP) 414 */ 415 exthdrs.ip6e_dest2 = NULL; 416 417 if (exthdrs.ip6e_rthdr) { 418 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 419 segleft_org = rh->ip6r_segleft; 420 rh->ip6r_segleft = 0; 421 } 422 423 bzero(&state, sizeof state); 424 state.m = m; 425 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 426 &needipsectun); 427 m = state.m; 428 if (error) { 429 /* mbuf is already reclaimed in ipsec6_output_trans. */ 430 m = NULL; 431 switch (error) { 432 case EHOSTUNREACH: 433 case ENETUNREACH: 434 case EMSGSIZE: 435 case ENOBUFS: 436 case ENOMEM: 437 break; 438 default: 439 kprintf("ip6_output (ipsec): error code %d\n", 440 error); 441 /* fall through */ 442 case ENOENT: 443 /* don't show these error codes to the user */ 444 error = 0; 445 break; 446 } 447 goto bad; 448 } 449 if (exthdrs.ip6e_rthdr) { 450 /* ah6_output doesn't modify mbuf chain */ 451 rh->ip6r_segleft = segleft_org; 452 } 453 } 454 #endif 455 456 /* 457 * If there is a routing header, replace destination address field 458 * with the first hop of the routing header. 459 */ 460 if (exthdrs.ip6e_rthdr) { 461 struct ip6_rthdr *rh; 462 463 finaldst = ip6->ip6_dst; 464 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 465 switch (rh->ip6r_type) { 466 default: /* is it possible? */ 467 error = EINVAL; 468 goto bad; 469 } 470 } 471 472 /* Source address validation */ 473 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 474 !(flags & IPV6_DADOUTPUT)) { 475 error = EOPNOTSUPP; 476 ip6stat.ip6s_badscope++; 477 goto bad; 478 } 479 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 480 error = EOPNOTSUPP; 481 ip6stat.ip6s_badscope++; 482 goto bad; 483 } 484 485 ip6stat.ip6s_localout++; 486 487 /* 488 * Route packet. 489 */ 490 if (ro == NULL) { 491 ro = &ip6route; 492 bzero(ro, sizeof(*ro)); 493 } 494 ro_pmtu = ro; 495 if (opt && opt->ip6po_rthdr) 496 ro = &opt->ip6po_route; 497 dst = (struct sockaddr_in6 *)&ro->ro_dst; 498 /* 499 * If there is a cached route, 500 * check that it is to the same destination 501 * and is still up. If not, free it and try again. 502 */ 503 if (ro->ro_rt != NULL && 504 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 505 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 506 RTFREE(ro->ro_rt); 507 ro->ro_rt = NULL; 508 } 509 if (ro->ro_rt == NULL) { 510 bzero(dst, sizeof(*dst)); 511 dst->sin6_family = AF_INET6; 512 dst->sin6_len = sizeof(struct sockaddr_in6); 513 dst->sin6_addr = ip6->ip6_dst; 514 } 515 #if defined(IPSEC) || defined(FAST_IPSEC) 516 if (needipsec && needipsectun) { 517 struct ipsec_output_state state; 518 519 /* 520 * All the extension headers will become inaccessible 521 * (since they can be encrypted). 522 * Don't panic, we need no more updates to extension headers 523 * on inner IPv6 packet (since they are now encapsulated). 524 * 525 * IPv6 [ESP|AH] IPv6 [extension headers] payload 526 */ 527 bzero(&exthdrs, sizeof(exthdrs)); 528 exthdrs.ip6e_ip6 = m; 529 530 bzero(&state, sizeof(state)); 531 state.m = m; 532 state.ro = (struct route *)ro; 533 state.dst = (struct sockaddr *)dst; 534 535 error = ipsec6_output_tunnel(&state, sp, flags); 536 537 m = state.m; 538 ro = (struct route_in6 *)state.ro; 539 dst = (struct sockaddr_in6 *)state.dst; 540 if (error) { 541 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 542 m0 = m = NULL; 543 m = NULL; 544 switch (error) { 545 case EHOSTUNREACH: 546 case ENETUNREACH: 547 case EMSGSIZE: 548 case ENOBUFS: 549 case ENOMEM: 550 break; 551 default: 552 kprintf("ip6_output (ipsec): error code %d\n", error); 553 /* fall through */ 554 case ENOENT: 555 /* don't show these error codes to the user */ 556 error = 0; 557 break; 558 } 559 goto bad; 560 } 561 562 exthdrs.ip6e_ip6 = m; 563 } 564 #endif 565 566 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 567 /* Unicast */ 568 569 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 570 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 571 /* xxx 572 * interface selection comes here 573 * if an interface is specified from an upper layer, 574 * ifp must point it. 575 */ 576 if (ro->ro_rt == NULL) { 577 /* 578 * non-bsdi always clone routes, if parent is 579 * PRF_CLONING. 580 */ 581 rtalloc((struct route *)ro); 582 } 583 if (ro->ro_rt == NULL) { 584 ip6stat.ip6s_noroute++; 585 error = EHOSTUNREACH; 586 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 587 goto bad; 588 } 589 ia = ifatoia6(ro->ro_rt->rt_ifa); 590 ifp = ro->ro_rt->rt_ifp; 591 ro->ro_rt->rt_use++; 592 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 593 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 594 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 595 596 in6_ifstat_inc(ifp, ifs6_out_request); 597 598 /* 599 * Check if the outgoing interface conflicts with 600 * the interface specified by ifi6_ifindex (if specified). 601 * Note that loopback interface is always okay. 602 * (this may happen when we are sending a packet to one of 603 * our own addresses.) 604 */ 605 if (opt && opt->ip6po_pktinfo 606 && opt->ip6po_pktinfo->ipi6_ifindex) { 607 if (!(ifp->if_flags & IFF_LOOPBACK) 608 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 609 ip6stat.ip6s_noroute++; 610 in6_ifstat_inc(ifp, ifs6_out_discard); 611 error = EHOSTUNREACH; 612 goto bad; 613 } 614 } 615 616 if (opt && opt->ip6po_hlim != -1) 617 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 618 } else { 619 /* Multicast */ 620 struct in6_multi *in6m; 621 622 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 623 624 /* 625 * See if the caller provided any multicast options 626 */ 627 ifp = NULL; 628 if (im6o != NULL) { 629 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 630 if (im6o->im6o_multicast_ifp != NULL) 631 ifp = im6o->im6o_multicast_ifp; 632 } else 633 ip6->ip6_hlim = ip6_defmcasthlim; 634 635 /* 636 * See if the caller provided the outgoing interface 637 * as an ancillary data. 638 * Boundary check for ifindex is assumed to be already done. 639 */ 640 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 641 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 642 643 /* 644 * If the destination is a node-local scope multicast, 645 * the packet should be loop-backed only. 646 */ 647 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 648 /* 649 * If the outgoing interface is already specified, 650 * it should be a loopback interface. 651 */ 652 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 653 ip6stat.ip6s_badscope++; 654 error = ENETUNREACH; /* XXX: better error? */ 655 /* XXX correct ifp? */ 656 in6_ifstat_inc(ifp, ifs6_out_discard); 657 goto bad; 658 } else { 659 ifp = &loif[0]; 660 } 661 } 662 663 if (opt && opt->ip6po_hlim != -1) 664 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 665 666 /* 667 * If caller did not provide an interface lookup a 668 * default in the routing table. This is either a 669 * default for the speicfied group (i.e. a host 670 * route), or a multicast default (a route for the 671 * ``net'' ff00::/8). 672 */ 673 if (ifp == NULL) { 674 if (ro->ro_rt == NULL) { 675 ro->ro_rt = 676 rtpurelookup((struct sockaddr *)&ro->ro_dst); 677 } 678 if (ro->ro_rt == NULL) { 679 ip6stat.ip6s_noroute++; 680 error = EHOSTUNREACH; 681 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 682 goto bad; 683 } 684 ia = ifatoia6(ro->ro_rt->rt_ifa); 685 ifp = ro->ro_rt->rt_ifp; 686 ro->ro_rt->rt_use++; 687 } 688 689 if (!(flags & IPV6_FORWARDING)) 690 in6_ifstat_inc(ifp, ifs6_out_request); 691 in6_ifstat_inc(ifp, ifs6_out_mcast); 692 693 /* 694 * Confirm that the outgoing interface supports multicast. 695 */ 696 if (!(ifp->if_flags & IFF_MULTICAST)) { 697 ip6stat.ip6s_noroute++; 698 in6_ifstat_inc(ifp, ifs6_out_discard); 699 error = ENETUNREACH; 700 goto bad; 701 } 702 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 703 if (in6m != NULL && 704 (im6o == NULL || im6o->im6o_multicast_loop)) { 705 /* 706 * If we belong to the destination multicast group 707 * on the outgoing interface, and the caller did not 708 * forbid loopback, loop back a copy. 709 */ 710 ip6_mloopback(ifp, m, dst); 711 } else { 712 /* 713 * If we are acting as a multicast router, perform 714 * multicast forwarding as if the packet had just 715 * arrived on the interface to which we are about 716 * to send. The multicast forwarding function 717 * recursively calls this function, using the 718 * IPV6_FORWARDING flag to prevent infinite recursion. 719 * 720 * Multicasts that are looped back by ip6_mloopback(), 721 * above, will be forwarded by the ip6_input() routine, 722 * if necessary. 723 */ 724 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 725 if (ip6_mforward(ip6, ifp, m) != 0) { 726 m_freem(m); 727 goto done; 728 } 729 } 730 } 731 /* 732 * Multicasts with a hoplimit of zero may be looped back, 733 * above, but must not be transmitted on a network. 734 * Also, multicasts addressed to the loopback interface 735 * are not sent -- the above call to ip6_mloopback() will 736 * loop back a copy if this host actually belongs to the 737 * destination group on the loopback interface. 738 */ 739 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 740 m_freem(m); 741 goto done; 742 } 743 } 744 745 /* 746 * Fill the outgoing inteface to tell the upper layer 747 * to increment per-interface statistics. 748 */ 749 if (ifpp) 750 *ifpp = ifp; 751 752 /* Determine path MTU. */ 753 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 754 &alwaysfrag)) != 0) 755 goto bad; 756 757 /* 758 * The caller of this function may specify to use the minimum MTU 759 * in some cases. 760 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 761 * setting. The logic is a bit complicated; by default, unicast 762 * packets will follow path MTU while multicast packets will be sent at 763 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 764 * including unicast ones will be sent at the minimum MTU. Multicast 765 * packets will always be sent at the minimum MTU unless 766 * IP6PO_MINMTU_DISABLE is explicitly specified. 767 * See RFC 3542 for more details. 768 */ 769 if (mtu > IPV6_MMTU) { 770 if ((flags & IPV6_MINMTU)) 771 mtu = IPV6_MMTU; 772 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 773 mtu = IPV6_MMTU; 774 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 775 (opt == NULL || 776 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 777 mtu = IPV6_MMTU; 778 } 779 } 780 781 /* Fake scoped addresses */ 782 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 783 /* 784 * If source or destination address is a scoped address, and 785 * the packet is going to be sent to a loopback interface, 786 * we should keep the original interface. 787 */ 788 789 /* 790 * XXX: this is a very experimental and temporary solution. 791 * We eventually have sockaddr_in6 and use the sin6_scope_id 792 * field of the structure here. 793 * We rely on the consistency between two scope zone ids 794 * of source and destination, which should already be assured. 795 * Larger scopes than link will be supported in the future. 796 */ 797 origifp = NULL; 798 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 799 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 800 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 801 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 802 /* 803 * XXX: origifp can be NULL even in those two cases above. 804 * For example, if we remove the (only) link-local address 805 * from the loopback interface, and try to send a link-local 806 * address without link-id information. Then the source 807 * address is ::1, and the destination address is the 808 * link-local address with its s6_addr16[1] being zero. 809 * What is worse, if the packet goes to the loopback interface 810 * by a default rejected route, the null pointer would be 811 * passed to looutput, and the kernel would hang. 812 * The following last resort would prevent such disaster. 813 */ 814 if (origifp == NULL) 815 origifp = ifp; 816 } 817 else 818 origifp = ifp; 819 /* 820 * clear embedded scope identifiers if necessary. 821 * in6_clearscope will touch the addresses only when necessary. 822 */ 823 in6_clearscope(&ip6->ip6_src); 824 in6_clearscope(&ip6->ip6_dst); 825 826 /* 827 * Check with the firewall... 828 */ 829 if (ip6_fw_enable && ip6_fw_chk_ptr) { 830 u_short port = 0; 831 832 m->m_pkthdr.rcvif = NULL; /* XXX */ 833 /* If ipfw says divert, we have to just drop packet */ 834 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 835 m_freem(m); 836 goto done; 837 } 838 if (!m) { 839 error = EACCES; 840 goto done; 841 } 842 } 843 844 /* 845 * If the outgoing packet contains a hop-by-hop options header, 846 * it must be examined and processed even by the source node. 847 * (RFC 2460, section 4.) 848 */ 849 if (exthdrs.ip6e_hbh) { 850 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 851 u_int32_t dummy1; /* XXX unused */ 852 u_int32_t dummy2; /* XXX unused */ 853 854 #ifdef DIAGNOSTIC 855 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 856 panic("ip6e_hbh is not continuous"); 857 #endif 858 /* 859 * XXX: if we have to send an ICMPv6 error to the sender, 860 * we need the M_LOOP flag since icmp6_error() expects 861 * the IPv6 and the hop-by-hop options header are 862 * continuous unless the flag is set. 863 */ 864 m->m_flags |= M_LOOP; 865 m->m_pkthdr.rcvif = ifp; 866 if (ip6_process_hopopts(m, 867 (u_int8_t *)(hbh + 1), 868 ((hbh->ip6h_len + 1) << 3) - 869 sizeof(struct ip6_hbh), 870 &dummy1, &dummy2) < 0) { 871 /* m was already freed at this point */ 872 error = EINVAL;/* better error? */ 873 goto done; 874 } 875 m->m_flags &= ~M_LOOP; /* XXX */ 876 m->m_pkthdr.rcvif = NULL; 877 } 878 879 /* 880 * Run through list of hooks for output packets. 881 */ 882 if (pfil_has_hooks(&inet6_pfil_hook)) { 883 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 884 if (error != 0 || m == NULL) 885 goto done; 886 ip6 = mtod(m, struct ip6_hdr *); 887 } 888 889 /* 890 * Send the packet to the outgoing interface. 891 * If necessary, do IPv6 fragmentation before sending. 892 * 893 * the logic here is rather complex: 894 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 895 * 1-a: send as is if tlen <= path mtu 896 * 1-b: fragment if tlen > path mtu 897 * 898 * 2: if user asks us not to fragment (dontfrag == 1) 899 * 2-a: send as is if tlen <= interface mtu 900 * 2-b: error if tlen > interface mtu 901 * 902 * 3: if we always need to attach fragment header (alwaysfrag == 1) 903 * always fragment 904 * 905 * 4: if dontfrag == 1 && alwaysfrag == 1 906 * error, as we cannot handle this conflicting request 907 */ 908 tlen = m->m_pkthdr.len; 909 910 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 911 dontfrag = 1; 912 else 913 dontfrag = 0; 914 if (dontfrag && alwaysfrag) { /* case 4 */ 915 /* conflicting request - can't transmit */ 916 error = EMSGSIZE; 917 goto bad; 918 } 919 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 920 /* 921 * Even if the DONTFRAG option is specified, we cannot send the 922 * packet when the data length is larger than the MTU of the 923 * outgoing interface. 924 * Notify the error by sending IPV6_PATHMTU ancillary data as 925 * well as returning an error code (the latter is not described 926 * in the API spec.) 927 */ 928 u_int32_t mtu32; 929 struct ip6ctlparam ip6cp; 930 931 mtu32 = (u_int32_t)mtu; 932 bzero(&ip6cp, sizeof(ip6cp)); 933 ip6cp.ip6c_cmdarg = (void *)&mtu32; 934 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 935 (void *)&ip6cp); 936 937 error = EMSGSIZE; 938 goto bad; 939 } 940 941 /* 942 * transmit packet without fragmentation 943 */ 944 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 945 struct in6_ifaddr *ia6; 946 947 ip6 = mtod(m, struct ip6_hdr *); 948 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 949 if (ia6) { 950 /* Record statistics for this interface address. */ 951 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1); 952 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len); 953 } 954 #ifdef IPSEC 955 /* clean ipsec history once it goes out of the node */ 956 ipsec_delaux(m); 957 #endif 958 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 959 goto done; 960 } 961 962 /* 963 * try to fragment the packet. case 1-b and 3 964 */ 965 if (mtu < IPV6_MMTU) { 966 /* 967 * note that path MTU is never less than IPV6_MMTU 968 * (see icmp6_input). 969 */ 970 error = EMSGSIZE; 971 in6_ifstat_inc(ifp, ifs6_out_fragfail); 972 goto bad; 973 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 974 error = EMSGSIZE; 975 in6_ifstat_inc(ifp, ifs6_out_fragfail); 976 goto bad; 977 } else { 978 struct mbuf **mnext, *m_frgpart; 979 struct ip6_frag *ip6f; 980 u_int32_t id = htonl(ip6_id++); 981 u_char nextproto; 982 983 /* 984 * Too large for the destination or interface; 985 * fragment if possible. 986 * Must be able to put at least 8 bytes per fragment. 987 */ 988 hlen = unfragpartlen; 989 if (mtu > IPV6_MAXPACKET) 990 mtu = IPV6_MAXPACKET; 991 992 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 993 if (len < 8) { 994 error = EMSGSIZE; 995 in6_ifstat_inc(ifp, ifs6_out_fragfail); 996 goto bad; 997 } 998 999 mnext = &m->m_nextpkt; 1000 1001 /* 1002 * Change the next header field of the last header in the 1003 * unfragmentable part. 1004 */ 1005 if (exthdrs.ip6e_rthdr) { 1006 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1007 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1008 } else if (exthdrs.ip6e_dest1) { 1009 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1010 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1011 } else if (exthdrs.ip6e_hbh) { 1012 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1013 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1014 } else { 1015 nextproto = ip6->ip6_nxt; 1016 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1017 } 1018 1019 /* 1020 * Loop through length of segment after first fragment, 1021 * make new header and copy data of each part and link onto 1022 * chain. 1023 */ 1024 m0 = m; 1025 for (off = hlen; off < tlen; off += len) { 1026 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1027 if (!m) { 1028 error = ENOBUFS; 1029 ip6stat.ip6s_odropped++; 1030 goto sendorfree; 1031 } 1032 m->m_pkthdr.rcvif = NULL; 1033 m->m_flags = m0->m_flags & M_COPYFLAGS; 1034 *mnext = m; 1035 mnext = &m->m_nextpkt; 1036 m->m_data += max_linkhdr; 1037 mhip6 = mtod(m, struct ip6_hdr *); 1038 *mhip6 = *ip6; 1039 m->m_len = sizeof(*mhip6); 1040 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1041 if (error) { 1042 ip6stat.ip6s_odropped++; 1043 goto sendorfree; 1044 } 1045 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1046 if (off + len >= tlen) 1047 len = tlen - off; 1048 else 1049 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1050 mhip6->ip6_plen = htons((u_short)(len + hlen + 1051 sizeof(*ip6f) - 1052 sizeof(struct ip6_hdr))); 1053 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1054 error = ENOBUFS; 1055 ip6stat.ip6s_odropped++; 1056 goto sendorfree; 1057 } 1058 m_cat(m, m_frgpart); 1059 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1060 m->m_pkthdr.rcvif = NULL; 1061 ip6f->ip6f_reserved = 0; 1062 ip6f->ip6f_ident = id; 1063 ip6f->ip6f_nxt = nextproto; 1064 ip6stat.ip6s_ofragments++; 1065 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1066 } 1067 1068 in6_ifstat_inc(ifp, ifs6_out_fragok); 1069 } 1070 1071 /* 1072 * Remove leading garbages. 1073 */ 1074 sendorfree: 1075 m = m0->m_nextpkt; 1076 m0->m_nextpkt = NULL; 1077 m_freem(m0); 1078 for (m0 = m; m; m = m0) { 1079 m0 = m->m_nextpkt; 1080 m->m_nextpkt = NULL; 1081 if (error == 0) { 1082 /* Record statistics for this interface address. */ 1083 if (ia) { 1084 IFA_STAT_INC(&ia->ia_ifa, opackets, 1); 1085 IFA_STAT_INC(&ia->ia_ifa, obytes, 1086 m->m_pkthdr.len); 1087 } 1088 #ifdef IPSEC 1089 /* clean ipsec history once it goes out of the node */ 1090 ipsec_delaux(m); 1091 #endif 1092 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1093 } else 1094 m_freem(m); 1095 } 1096 1097 if (error == 0) 1098 ip6stat.ip6s_fragmented++; 1099 1100 done: 1101 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1102 RTFREE(ro->ro_rt); 1103 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1104 RTFREE(ro_pmtu->ro_rt); 1105 } 1106 1107 #ifdef IPSEC 1108 if (sp != NULL) 1109 key_freesp(sp); 1110 #endif 1111 #ifdef FAST_IPSEC 1112 if (sp != NULL) 1113 KEY_FREESP(&sp); 1114 #endif 1115 1116 return (error); 1117 1118 freehdrs: 1119 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1120 m_freem(exthdrs.ip6e_dest1); 1121 m_freem(exthdrs.ip6e_rthdr); 1122 m_freem(exthdrs.ip6e_dest2); 1123 /* fall through */ 1124 bad: 1125 m_freem(m); 1126 goto done; 1127 } 1128 1129 static int 1130 copyexthdr(void *h, struct mbuf **mp) 1131 { 1132 struct ip6_ext *hdr = h; 1133 int hlen; 1134 struct mbuf *m; 1135 1136 if (hdr == NULL) 1137 return 0; 1138 1139 hlen = (hdr->ip6e_len + 1) * 8; 1140 if (hlen > MCLBYTES) 1141 return ENOBUFS; /* XXX */ 1142 1143 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0); 1144 if (!m) 1145 return ENOBUFS; 1146 m->m_len = hlen; 1147 1148 bcopy(hdr, mtod(m, caddr_t), hlen); 1149 1150 *mp = m; 1151 return 0; 1152 } 1153 1154 /* 1155 * Insert jumbo payload option. 1156 */ 1157 static int 1158 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1159 { 1160 struct mbuf *mopt; 1161 u_char *optbuf; 1162 u_int32_t v; 1163 1164 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1165 1166 /* 1167 * If there is no hop-by-hop options header, allocate new one. 1168 * If there is one but it doesn't have enough space to store the 1169 * jumbo payload option, allocate a cluster to store the whole options. 1170 * Otherwise, use it to store the options. 1171 */ 1172 if (exthdrs->ip6e_hbh == NULL) { 1173 MGET(mopt, MB_DONTWAIT, MT_DATA); 1174 if (mopt == NULL) 1175 return (ENOBUFS); 1176 mopt->m_len = JUMBOOPTLEN; 1177 optbuf = mtod(mopt, u_char *); 1178 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1179 exthdrs->ip6e_hbh = mopt; 1180 } else { 1181 struct ip6_hbh *hbh; 1182 1183 mopt = exthdrs->ip6e_hbh; 1184 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1185 /* 1186 * XXX assumption: 1187 * - exthdrs->ip6e_hbh is not referenced from places 1188 * other than exthdrs. 1189 * - exthdrs->ip6e_hbh is not an mbuf chain. 1190 */ 1191 int oldoptlen = mopt->m_len; 1192 struct mbuf *n; 1193 1194 /* 1195 * XXX: give up if the whole (new) hbh header does 1196 * not fit even in an mbuf cluster. 1197 */ 1198 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1199 return (ENOBUFS); 1200 1201 /* 1202 * As a consequence, we must always prepare a cluster 1203 * at this point. 1204 */ 1205 n = m_getcl(MB_DONTWAIT, MT_DATA, 0); 1206 if (!n) 1207 return (ENOBUFS); 1208 n->m_len = oldoptlen + JUMBOOPTLEN; 1209 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1210 optbuf = mtod(n, caddr_t) + oldoptlen; 1211 m_freem(mopt); 1212 mopt = exthdrs->ip6e_hbh = n; 1213 } else { 1214 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1215 mopt->m_len += JUMBOOPTLEN; 1216 } 1217 optbuf[0] = IP6OPT_PADN; 1218 optbuf[1] = 1; 1219 1220 /* 1221 * Adjust the header length according to the pad and 1222 * the jumbo payload option. 1223 */ 1224 hbh = mtod(mopt, struct ip6_hbh *); 1225 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1226 } 1227 1228 /* fill in the option. */ 1229 optbuf[2] = IP6OPT_JUMBO; 1230 optbuf[3] = 4; 1231 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1232 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1233 1234 /* finally, adjust the packet header length */ 1235 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1236 1237 return (0); 1238 #undef JUMBOOPTLEN 1239 } 1240 1241 /* 1242 * Insert fragment header and copy unfragmentable header portions. 1243 */ 1244 static int 1245 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1246 struct ip6_frag **frghdrp) 1247 { 1248 struct mbuf *n, *mlast; 1249 1250 if (hlen > sizeof(struct ip6_hdr)) { 1251 n = m_copym(m0, sizeof(struct ip6_hdr), 1252 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1253 if (n == NULL) 1254 return (ENOBUFS); 1255 m->m_next = n; 1256 } else 1257 n = m; 1258 1259 /* Search for the last mbuf of unfragmentable part. */ 1260 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1261 ; 1262 1263 if (!(mlast->m_flags & M_EXT) && 1264 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1265 /* use the trailing space of the last mbuf for the fragment hdr */ 1266 *frghdrp = 1267 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1268 mlast->m_len += sizeof(struct ip6_frag); 1269 m->m_pkthdr.len += sizeof(struct ip6_frag); 1270 } else { 1271 /* allocate a new mbuf for the fragment header */ 1272 struct mbuf *mfrg; 1273 1274 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1275 if (mfrg == NULL) 1276 return (ENOBUFS); 1277 mfrg->m_len = sizeof(struct ip6_frag); 1278 *frghdrp = mtod(mfrg, struct ip6_frag *); 1279 mlast->m_next = mfrg; 1280 } 1281 1282 return (0); 1283 } 1284 1285 static int 1286 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1287 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1288 int *alwaysfragp) 1289 { 1290 u_int32_t mtu = 0; 1291 int alwaysfrag = 0; 1292 int error = 0; 1293 1294 if (ro_pmtu != ro) { 1295 /* The first hop and the final destination may differ. */ 1296 struct sockaddr_in6 *sa6_dst = 1297 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1298 if (ro_pmtu->ro_rt && 1299 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1300 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1301 RTFREE(ro_pmtu->ro_rt); 1302 ro_pmtu->ro_rt = NULL; 1303 } 1304 if (ro_pmtu->ro_rt == NULL) { 1305 bzero(sa6_dst, sizeof(*sa6_dst)); 1306 sa6_dst->sin6_family = AF_INET6; 1307 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1308 sa6_dst->sin6_addr = *dst; 1309 1310 rtalloc((struct route *)ro_pmtu); 1311 } 1312 } 1313 if (ro_pmtu->ro_rt) { 1314 u_int32_t ifmtu; 1315 struct in_conninfo inc; 1316 1317 bzero(&inc, sizeof(inc)); 1318 inc.inc_flags = 1; /* IPv6 */ 1319 inc.inc6_faddr = *dst; 1320 1321 if (ifp == NULL) 1322 ifp = ro_pmtu->ro_rt->rt_ifp; 1323 ifmtu = IN6_LINKMTU(ifp); 1324 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1325 if (mtu == 0) 1326 mtu = ifmtu; 1327 else if (mtu < IPV6_MMTU) { 1328 /* 1329 * RFC2460 section 5, last paragraph: 1330 * if we record ICMPv6 too big message with 1331 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1332 * or smaller, with framgent header attached. 1333 * (fragment header is needed regardless from the 1334 * packet size, for translators to identify packets) 1335 */ 1336 alwaysfrag = 1; 1337 mtu = IPV6_MMTU; 1338 } else if (mtu > ifmtu) { 1339 /* 1340 * The MTU on the route is larger than the MTU on 1341 * the interface! This shouldn't happen, unless the 1342 * MTU of the interface has been changed after the 1343 * interface was brought up. Change the MTU in the 1344 * route to match the interface MTU (as long as the 1345 * field isn't locked). 1346 */ 1347 mtu = ifmtu; 1348 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1349 } 1350 } else if (ifp) { 1351 mtu = IN6_LINKMTU(ifp); 1352 } else 1353 error = EHOSTUNREACH; /* XXX */ 1354 1355 *mtup = mtu; 1356 if (alwaysfragp) 1357 *alwaysfragp = alwaysfrag; 1358 return (error); 1359 } 1360 1361 /* 1362 * IP6 socket option processing. 1363 */ 1364 void 1365 ip6_ctloutput_dispatch(netmsg_t msg) 1366 { 1367 int error; 1368 1369 error = ip6_ctloutput(msg->ctloutput.base.nm_so, 1370 msg->ctloutput.nm_sopt); 1371 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 1372 } 1373 1374 int 1375 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1376 { 1377 int optdatalen,uproto; 1378 int privileged; 1379 struct inpcb *in6p = so->so_pcb; 1380 void *optdata; 1381 int error, optval; 1382 int level, op, optname; 1383 int optlen; 1384 struct thread *td; 1385 1386 if (sopt) { 1387 level = sopt->sopt_level; 1388 op = sopt->sopt_dir; 1389 optname = sopt->sopt_name; 1390 optlen = sopt->sopt_valsize; 1391 td = sopt->sopt_td; 1392 } else { 1393 panic("ip6_ctloutput: arg soopt is NULL"); 1394 /* NOT REACHED */ 1395 td = NULL; 1396 } 1397 error = optval = 0; 1398 1399 uproto = (int)so->so_proto->pr_protocol; 1400 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1; 1401 1402 if (level == IPPROTO_IPV6) { 1403 switch (op) { 1404 1405 case SOPT_SET: 1406 switch (optname) { 1407 case IPV6_2292PKTOPTIONS: 1408 #ifdef IPV6_PKTOPTIONS 1409 case IPV6_PKTOPTIONS: 1410 #endif 1411 { 1412 struct mbuf *m; 1413 1414 error = soopt_getm(sopt, &m); /* XXX */ 1415 if (error != 0) 1416 break; 1417 soopt_to_mbuf(sopt, m); /* XXX */ 1418 error = ip6_pcbopts(&in6p->in6p_outputopts, 1419 m, so, sopt); 1420 m_freem(m); /* XXX */ 1421 break; 1422 } 1423 1424 /* 1425 * Use of some Hop-by-Hop options or some 1426 * Destination options, might require special 1427 * privilege. That is, normal applications 1428 * (without special privilege) might be forbidden 1429 * from setting certain options in outgoing packets, 1430 * and might never see certain options in received 1431 * packets. [RFC 2292 Section 6] 1432 * KAME specific note: 1433 * KAME prevents non-privileged users from sending or 1434 * receiving ANY hbh/dst options in order to avoid 1435 * overhead of parsing options in the kernel. 1436 */ 1437 case IPV6_RECVHOPOPTS: 1438 case IPV6_RECVDSTOPTS: 1439 case IPV6_RECVRTHDRDSTOPTS: 1440 if (!privileged) 1441 return (EPERM); 1442 case IPV6_RECVPKTINFO: 1443 case IPV6_RECVHOPLIMIT: 1444 case IPV6_RECVRTHDR: 1445 case IPV6_RECVPATHMTU: 1446 case IPV6_RECVTCLASS: 1447 case IPV6_AUTOFLOWLABEL: 1448 case IPV6_HOPLIMIT: 1449 /* FALLTHROUGH */ 1450 case IPV6_UNICAST_HOPS: 1451 case IPV6_FAITH: 1452 1453 case IPV6_V6ONLY: 1454 if (optlen != sizeof(int)) { 1455 error = EINVAL; 1456 break; 1457 } 1458 error = soopt_to_kbuf(sopt, &optval, 1459 sizeof optval, sizeof optval); 1460 if (error) 1461 break; 1462 switch (optname) { 1463 1464 case IPV6_UNICAST_HOPS: 1465 if (optval < -1 || optval >= 256) 1466 error = EINVAL; 1467 else { 1468 /* -1 = kernel default */ 1469 in6p->in6p_hops = optval; 1470 1471 if ((in6p->in6p_vflag & 1472 INP_IPV4) != 0) 1473 in6p->inp_ip_ttl = optval; 1474 } 1475 break; 1476 #define OPTSET(bit) \ 1477 do { \ 1478 if (optval) \ 1479 in6p->in6p_flags |= (bit); \ 1480 else \ 1481 in6p->in6p_flags &= ~(bit); \ 1482 } while (0) 1483 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1484 /* 1485 * Although changed to RFC3542, It's better to also support RFC2292 API 1486 */ 1487 #define OPTSET2292(bit) \ 1488 do { \ 1489 in6p->in6p_flags |= IN6P_RFC2292; \ 1490 if (optval) \ 1491 in6p->in6p_flags |= (bit); \ 1492 else \ 1493 in6p->in6p_flags &= ~(bit); \ 1494 } while (/*CONSTCOND*/ 0) 1495 1496 case IPV6_RECVPKTINFO: 1497 /* cannot mix with RFC2292 */ 1498 if (OPTBIT(IN6P_RFC2292)) { 1499 error = EINVAL; 1500 break; 1501 } 1502 OPTSET(IN6P_PKTINFO); 1503 break; 1504 1505 case IPV6_HOPLIMIT: 1506 { 1507 struct ip6_pktopts **optp; 1508 1509 /* cannot mix with RFC2292 */ 1510 if (OPTBIT(IN6P_RFC2292)) { 1511 error = EINVAL; 1512 break; 1513 } 1514 optp = &in6p->in6p_outputopts; 1515 error = ip6_pcbopt(IPV6_HOPLIMIT, 1516 (u_char *)&optval, sizeof(optval), 1517 optp, uproto); 1518 break; 1519 } 1520 1521 case IPV6_RECVHOPLIMIT: 1522 /* cannot mix with RFC2292 */ 1523 if (OPTBIT(IN6P_RFC2292)) { 1524 error = EINVAL; 1525 break; 1526 } 1527 OPTSET(IN6P_HOPLIMIT); 1528 break; 1529 1530 case IPV6_RECVHOPOPTS: 1531 /* cannot mix with RFC2292 */ 1532 if (OPTBIT(IN6P_RFC2292)) { 1533 error = EINVAL; 1534 break; 1535 } 1536 OPTSET(IN6P_HOPOPTS); 1537 break; 1538 1539 case IPV6_RECVDSTOPTS: 1540 /* cannot mix with RFC2292 */ 1541 if (OPTBIT(IN6P_RFC2292)) { 1542 error = EINVAL; 1543 break; 1544 } 1545 OPTSET(IN6P_DSTOPTS); 1546 break; 1547 1548 case IPV6_RECVRTHDRDSTOPTS: 1549 /* cannot mix with RFC2292 */ 1550 if (OPTBIT(IN6P_RFC2292)) { 1551 error = EINVAL; 1552 break; 1553 } 1554 OPTSET(IN6P_RTHDRDSTOPTS); 1555 break; 1556 1557 case IPV6_RECVRTHDR: 1558 /* cannot mix with RFC2292 */ 1559 if (OPTBIT(IN6P_RFC2292)) { 1560 error = EINVAL; 1561 break; 1562 } 1563 OPTSET(IN6P_RTHDR); 1564 break; 1565 1566 case IPV6_RECVPATHMTU: 1567 /* 1568 * We ignore this option for TCP 1569 * sockets. 1570 * (RFC3542 leaves this case 1571 * unspecified.) 1572 */ 1573 if (uproto != IPPROTO_TCP) 1574 OPTSET(IN6P_MTU); 1575 break; 1576 1577 case IPV6_RECVTCLASS: 1578 /* cannot mix with RFC2292 XXX */ 1579 if (OPTBIT(IN6P_RFC2292)) { 1580 error = EINVAL; 1581 break; 1582 } 1583 OPTSET(IN6P_TCLASS); 1584 break; 1585 1586 case IPV6_AUTOFLOWLABEL: 1587 OPTSET(IN6P_AUTOFLOWLABEL); 1588 break; 1589 1590 case IPV6_FAITH: 1591 OPTSET(IN6P_FAITH); 1592 break; 1593 1594 case IPV6_V6ONLY: 1595 /* 1596 * make setsockopt(IPV6_V6ONLY) 1597 * available only prior to bind(2). 1598 */ 1599 if (in6p->in6p_lport || 1600 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1601 { 1602 error = EINVAL; 1603 break; 1604 } 1605 OPTSET(IN6P_IPV6_V6ONLY); 1606 if (optval) 1607 in6p->in6p_vflag &= ~INP_IPV4; 1608 else 1609 in6p->in6p_vflag |= INP_IPV4; 1610 break; 1611 } 1612 break; 1613 1614 case IPV6_TCLASS: 1615 case IPV6_DONTFRAG: 1616 case IPV6_USE_MIN_MTU: 1617 case IPV6_PREFER_TEMPADDR: 1618 if (optlen != sizeof(optval)) { 1619 error = EINVAL; 1620 break; 1621 } 1622 error = soopt_to_kbuf(sopt, &optval, 1623 sizeof optval, sizeof optval); 1624 if (error) 1625 break; 1626 { 1627 struct ip6_pktopts **optp; 1628 optp = &in6p->in6p_outputopts; 1629 error = ip6_pcbopt(optname, 1630 (u_char *)&optval, sizeof(optval), 1631 optp, uproto); 1632 break; 1633 } 1634 1635 case IPV6_2292PKTINFO: 1636 case IPV6_2292HOPLIMIT: 1637 case IPV6_2292HOPOPTS: 1638 case IPV6_2292DSTOPTS: 1639 case IPV6_2292RTHDR: 1640 /* RFC 2292 */ 1641 if (optlen != sizeof(int)) { 1642 error = EINVAL; 1643 break; 1644 } 1645 error = soopt_to_kbuf(sopt, &optval, 1646 sizeof optval, sizeof optval); 1647 if (error) 1648 break; 1649 switch (optname) { 1650 case IPV6_2292PKTINFO: 1651 OPTSET2292(IN6P_PKTINFO); 1652 break; 1653 case IPV6_2292HOPLIMIT: 1654 OPTSET2292(IN6P_HOPLIMIT); 1655 break; 1656 case IPV6_2292HOPOPTS: 1657 /* 1658 * Check super-user privilege. 1659 * See comments for IPV6_RECVHOPOPTS. 1660 */ 1661 if (!privileged) 1662 return (EPERM); 1663 OPTSET2292(IN6P_HOPOPTS); 1664 break; 1665 case IPV6_2292DSTOPTS: 1666 if (!privileged) 1667 return (EPERM); 1668 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1669 break; 1670 case IPV6_2292RTHDR: 1671 OPTSET2292(IN6P_RTHDR); 1672 break; 1673 } 1674 break; 1675 1676 case IPV6_PKTINFO: 1677 case IPV6_HOPOPTS: 1678 case IPV6_RTHDR: 1679 case IPV6_DSTOPTS: 1680 case IPV6_RTHDRDSTOPTS: 1681 case IPV6_NEXTHOP: 1682 { 1683 /* 1684 * New advanced API (RFC3542) 1685 */ 1686 u_char *optbuf; 1687 u_char optbuf_storage[MCLBYTES]; 1688 int optlen; 1689 struct ip6_pktopts **optp; 1690 1691 /* cannot mix with RFC2292 */ 1692 if (OPTBIT(IN6P_RFC2292)) { 1693 error = EINVAL; 1694 break; 1695 } 1696 1697 /* 1698 * We only ensure valsize is not too large 1699 * here. Further validation will be done 1700 * later. 1701 */ 1702 error = soopt_to_kbuf(sopt, optbuf_storage, 1703 sizeof(optbuf_storage), 0); 1704 if (error) 1705 break; 1706 optlen = sopt->sopt_valsize; 1707 optbuf = optbuf_storage; 1708 optp = &in6p->in6p_outputopts; 1709 error = ip6_pcbopt(optname, optbuf, optlen, 1710 optp, uproto); 1711 break; 1712 } 1713 #undef OPTSET 1714 1715 case IPV6_MULTICAST_IF: 1716 case IPV6_MULTICAST_HOPS: 1717 case IPV6_MULTICAST_LOOP: 1718 case IPV6_JOIN_GROUP: 1719 case IPV6_LEAVE_GROUP: 1720 { 1721 struct mbuf *m; 1722 if (sopt->sopt_valsize > MLEN) { 1723 error = EMSGSIZE; 1724 break; 1725 } 1726 /* XXX */ 1727 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1728 if (m == NULL) { 1729 error = ENOBUFS; 1730 break; 1731 } 1732 m->m_len = sopt->sopt_valsize; 1733 error = soopt_to_kbuf(sopt, mtod(m, char *), 1734 m->m_len, m->m_len); 1735 error = ip6_setmoptions(sopt->sopt_name, 1736 &in6p->in6p_moptions, 1737 m); 1738 m_free(m); 1739 } 1740 break; 1741 1742 case IPV6_PORTRANGE: 1743 error = soopt_to_kbuf(sopt, &optval, 1744 sizeof optval, sizeof optval); 1745 if (error) 1746 break; 1747 1748 switch (optval) { 1749 case IPV6_PORTRANGE_DEFAULT: 1750 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1751 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1752 break; 1753 1754 case IPV6_PORTRANGE_HIGH: 1755 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1756 in6p->in6p_flags |= IN6P_HIGHPORT; 1757 break; 1758 1759 case IPV6_PORTRANGE_LOW: 1760 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1761 in6p->in6p_flags |= IN6P_LOWPORT; 1762 break; 1763 1764 default: 1765 error = EINVAL; 1766 break; 1767 } 1768 break; 1769 1770 #if defined(IPSEC) || defined(FAST_IPSEC) 1771 case IPV6_IPSEC_POLICY: 1772 { 1773 caddr_t req = NULL; 1774 size_t len = 0; 1775 struct mbuf *m; 1776 1777 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1778 break; 1779 soopt_to_mbuf(sopt, m); /* XXX */ 1780 if (m) { 1781 req = mtod(m, caddr_t); 1782 len = m->m_len; 1783 } 1784 error = ipsec6_set_policy(in6p, optname, req, 1785 len, privileged); 1786 m_freem(m); 1787 } 1788 break; 1789 #endif /* KAME IPSEC */ 1790 1791 case IPV6_FW_ADD: 1792 case IPV6_FW_DEL: 1793 case IPV6_FW_FLUSH: 1794 case IPV6_FW_ZERO: 1795 { 1796 struct mbuf *m; 1797 struct mbuf **mp = &m; 1798 1799 if (ip6_fw_ctl_ptr == NULL) 1800 return EINVAL; 1801 /* XXX */ 1802 if ((error = soopt_getm(sopt, &m)) != 0) 1803 break; 1804 /* XXX */ 1805 soopt_to_mbuf(sopt, m); 1806 error = (*ip6_fw_ctl_ptr)(optname, mp); 1807 m = *mp; 1808 } 1809 break; 1810 1811 default: 1812 error = ENOPROTOOPT; 1813 break; 1814 } 1815 break; 1816 1817 case SOPT_GET: 1818 switch (optname) { 1819 case IPV6_2292PKTOPTIONS: 1820 #ifdef IPV6_PKTOPTIONS 1821 case IPV6_PKTOPTIONS: 1822 #endif 1823 /* 1824 * RFC3542 (effectively) deprecated the 1825 * semantics of the 2292-style pktoptions. 1826 * Since it was not reliable in nature (i.e., 1827 * applications had to expect the lack of some 1828 * information after all), it would make sense 1829 * to simplify this part by always returning 1830 * empty data. 1831 */ 1832 if (in6p->in6p_options) { 1833 struct mbuf *m; 1834 m = m_copym(in6p->in6p_options, 1835 0, M_COPYALL, MB_WAIT); 1836 error = soopt_from_mbuf(sopt, m); 1837 if (error == 0) 1838 m_freem(m); 1839 } else 1840 sopt->sopt_valsize = 0; 1841 break; 1842 1843 case IPV6_RECVHOPOPTS: 1844 case IPV6_RECVDSTOPTS: 1845 case IPV6_RECVRTHDRDSTOPTS: 1846 case IPV6_UNICAST_HOPS: 1847 case IPV6_RECVPKTINFO: 1848 case IPV6_RECVHOPLIMIT: 1849 case IPV6_RECVRTHDR: 1850 case IPV6_RECVPATHMTU: 1851 case IPV6_RECVTCLASS: 1852 case IPV6_AUTOFLOWLABEL: 1853 case IPV6_FAITH: 1854 case IPV6_V6ONLY: 1855 case IPV6_PORTRANGE: 1856 switch (optname) { 1857 1858 case IPV6_RECVHOPOPTS: 1859 optval = OPTBIT(IN6P_HOPOPTS); 1860 break; 1861 1862 case IPV6_RECVDSTOPTS: 1863 optval = OPTBIT(IN6P_DSTOPTS); 1864 break; 1865 1866 case IPV6_RECVRTHDRDSTOPTS: 1867 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1868 break; 1869 1870 case IPV6_RECVPKTINFO: 1871 optval = OPTBIT(IN6P_PKTINFO); 1872 break; 1873 1874 case IPV6_RECVHOPLIMIT: 1875 optval = OPTBIT(IN6P_HOPLIMIT); 1876 break; 1877 1878 case IPV6_RECVRTHDR: 1879 optval = OPTBIT(IN6P_RTHDR); 1880 break; 1881 1882 case IPV6_RECVPATHMTU: 1883 optval = OPTBIT(IN6P_MTU); 1884 break; 1885 1886 case IPV6_RECVTCLASS: 1887 optval = OPTBIT(IN6P_TCLASS); 1888 break; 1889 1890 case IPV6_AUTOFLOWLABEL: 1891 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1892 break; 1893 1894 1895 case IPV6_UNICAST_HOPS: 1896 optval = in6p->in6p_hops; 1897 break; 1898 1899 case IPV6_FAITH: 1900 optval = OPTBIT(IN6P_FAITH); 1901 break; 1902 1903 case IPV6_V6ONLY: 1904 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1905 break; 1906 1907 case IPV6_PORTRANGE: 1908 { 1909 int flags; 1910 flags = in6p->in6p_flags; 1911 if (flags & IN6P_HIGHPORT) 1912 optval = IPV6_PORTRANGE_HIGH; 1913 else if (flags & IN6P_LOWPORT) 1914 optval = IPV6_PORTRANGE_LOW; 1915 else 1916 optval = 0; 1917 break; 1918 } 1919 } 1920 soopt_from_kbuf(sopt, &optval, 1921 sizeof optval); 1922 break; 1923 1924 case IPV6_PATHMTU: 1925 { 1926 u_long pmtu = 0; 1927 struct ip6_mtuinfo mtuinfo; 1928 struct route_in6 sro; 1929 1930 bzero(&sro, sizeof(sro)); 1931 1932 if (!(so->so_state & SS_ISCONNECTED)) 1933 return (ENOTCONN); 1934 /* 1935 * XXX: we dot not consider the case of source 1936 * routing, or optional information to specify 1937 * the outgoing interface. 1938 */ 1939 error = ip6_getpmtu(&sro, NULL, NULL, 1940 &in6p->in6p_faddr, &pmtu, NULL); 1941 if (sro.ro_rt) 1942 RTFREE(sro.ro_rt); 1943 if (error) 1944 break; 1945 if (pmtu > IPV6_MAXPACKET) 1946 pmtu = IPV6_MAXPACKET; 1947 1948 bzero(&mtuinfo, sizeof(mtuinfo)); 1949 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1950 optdata = (void *)&mtuinfo; 1951 optdatalen = sizeof(mtuinfo); 1952 soopt_from_kbuf(sopt, optdata, 1953 optdatalen); 1954 break; 1955 } 1956 1957 case IPV6_2292PKTINFO: 1958 case IPV6_2292HOPLIMIT: 1959 case IPV6_2292HOPOPTS: 1960 case IPV6_2292RTHDR: 1961 case IPV6_2292DSTOPTS: 1962 if (optname == IPV6_2292HOPOPTS || 1963 optname == IPV6_2292DSTOPTS || 1964 !privileged) 1965 return (EPERM); 1966 switch (optname) { 1967 case IPV6_2292PKTINFO: 1968 optval = OPTBIT(IN6P_PKTINFO); 1969 break; 1970 case IPV6_2292HOPLIMIT: 1971 optval = OPTBIT(IN6P_HOPLIMIT); 1972 break; 1973 case IPV6_2292HOPOPTS: 1974 if (!privileged) 1975 return (EPERM); 1976 optval = OPTBIT(IN6P_HOPOPTS); 1977 break; 1978 case IPV6_2292RTHDR: 1979 optval = OPTBIT(IN6P_RTHDR); 1980 break; 1981 case IPV6_2292DSTOPTS: 1982 if (!privileged) 1983 return (EPERM); 1984 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1985 break; 1986 } 1987 soopt_from_kbuf(sopt, &optval, 1988 sizeof optval); 1989 break; 1990 1991 case IPV6_PKTINFO: 1992 case IPV6_HOPOPTS: 1993 case IPV6_RTHDR: 1994 case IPV6_DSTOPTS: 1995 case IPV6_RTHDRDSTOPTS: 1996 case IPV6_NEXTHOP: 1997 case IPV6_TCLASS: 1998 case IPV6_DONTFRAG: 1999 case IPV6_USE_MIN_MTU: 2000 case IPV6_PREFER_TEMPADDR: 2001 error = ip6_getpcbopt(in6p->in6p_outputopts, 2002 optname, sopt); 2003 break; 2004 2005 case IPV6_MULTICAST_IF: 2006 case IPV6_MULTICAST_HOPS: 2007 case IPV6_MULTICAST_LOOP: 2008 case IPV6_JOIN_GROUP: 2009 case IPV6_LEAVE_GROUP: 2010 { 2011 struct mbuf *m; 2012 error = ip6_getmoptions(sopt->sopt_name, 2013 in6p->in6p_moptions, &m); 2014 if (error == 0) 2015 soopt_from_kbuf(sopt, 2016 mtod(m, char *), m->m_len); 2017 m_freem(m); 2018 } 2019 break; 2020 2021 #if defined(IPSEC) || defined(FAST_IPSEC) 2022 case IPV6_IPSEC_POLICY: 2023 { 2024 caddr_t req = NULL; 2025 size_t len = 0; 2026 struct mbuf *m = NULL; 2027 struct mbuf **mp = &m; 2028 2029 error = soopt_getm(sopt, &m); /* XXX */ 2030 if (error != 0) 2031 break; 2032 soopt_to_mbuf(sopt, m); /* XXX */ 2033 if (m) { 2034 req = mtod(m, caddr_t); 2035 len = m->m_len; 2036 } 2037 error = ipsec6_get_policy(in6p, req, len, mp); 2038 if (error == 0) 2039 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2040 if (error == 0 && m != NULL) 2041 m_freem(m); 2042 break; 2043 } 2044 #endif /* KAME IPSEC */ 2045 2046 case IPV6_FW_GET: 2047 { 2048 struct mbuf *m; 2049 struct mbuf **mp = &m; 2050 2051 if (ip6_fw_ctl_ptr == NULL) 2052 { 2053 return EINVAL; 2054 } 2055 error = (*ip6_fw_ctl_ptr)(optname, mp); 2056 if (error == 0) 2057 error = soopt_from_mbuf(sopt, m); /* XXX */ 2058 if (error == 0 && m != NULL) 2059 m_freem(m); 2060 } 2061 break; 2062 2063 default: 2064 error = ENOPROTOOPT; 2065 break; 2066 } 2067 break; 2068 } 2069 } else { 2070 error = EINVAL; 2071 } 2072 return (error); 2073 } 2074 2075 int 2076 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2077 { 2078 int error = 0, optval, optlen; 2079 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2080 struct in6pcb *in6p = sotoin6pcb(so); 2081 int level, op, optname; 2082 2083 if (sopt) { 2084 level = sopt->sopt_level; 2085 op = sopt->sopt_dir; 2086 optname = sopt->sopt_name; 2087 optlen = sopt->sopt_valsize; 2088 } else 2089 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2090 2091 if (level != IPPROTO_IPV6) { 2092 return (EINVAL); 2093 } 2094 2095 switch (optname) { 2096 case IPV6_CHECKSUM: 2097 /* 2098 * For ICMPv6 sockets, no modification allowed for checksum 2099 * offset, permit "no change" values to help existing apps. 2100 * 2101 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2102 * for an ICMPv6 socket will fail." 2103 * The current behavior does not meet RFC3542. 2104 */ 2105 switch (op) { 2106 case SOPT_SET: 2107 if (optlen != sizeof(int)) { 2108 error = EINVAL; 2109 break; 2110 } 2111 error = soopt_to_kbuf(sopt, &optval, 2112 sizeof optval, sizeof optval); 2113 if (error) 2114 break; 2115 if ((optval % 2) != 0) { 2116 /* the API assumes even offset values */ 2117 error = EINVAL; 2118 } else if (so->so_proto->pr_protocol == 2119 IPPROTO_ICMPV6) { 2120 if (optval != icmp6off) 2121 error = EINVAL; 2122 } else 2123 in6p->in6p_cksum = optval; 2124 break; 2125 2126 case SOPT_GET: 2127 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2128 optval = icmp6off; 2129 else 2130 optval = in6p->in6p_cksum; 2131 2132 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2133 break; 2134 2135 default: 2136 error = EINVAL; 2137 break; 2138 } 2139 break; 2140 2141 default: 2142 error = ENOPROTOOPT; 2143 break; 2144 } 2145 2146 return (error); 2147 } 2148 2149 /* 2150 * Set up IP6 options in pcb for insertion in output packets or 2151 * specifying behavior of outgoing packets. 2152 */ 2153 static int 2154 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2155 struct socket *so, struct sockopt *sopt) 2156 { 2157 int priv = 0; 2158 struct ip6_pktopts *opt = *pktopt; 2159 int error = 0; 2160 2161 /* turn off any old options. */ 2162 if (opt) { 2163 #ifdef DIAGNOSTIC 2164 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2165 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2166 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2167 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2168 #endif 2169 ip6_clearpktopts(opt, -1); 2170 } else 2171 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2172 *pktopt = NULL; 2173 2174 if (!m || m->m_len == 0) { 2175 /* 2176 * Only turning off any previous options, regardless of 2177 * whether the opt is just created or given. 2178 */ 2179 kfree(opt, M_IP6OPT); 2180 return (0); 2181 } 2182 2183 /* set options specified by user. */ 2184 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2185 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2186 kfree(opt, M_IP6OPT); 2187 return (error); 2188 } 2189 *pktopt = opt; 2190 return (0); 2191 } 2192 2193 2194 /* 2195 * Below three functions are introduced by merge to RFC3542 2196 */ 2197 2198 static int 2199 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2200 { 2201 void *optdata = NULL; 2202 int optdatalen = 0; 2203 struct ip6_ext *ip6e; 2204 int error = 0; 2205 struct in6_pktinfo null_pktinfo; 2206 int deftclass = 0, on; 2207 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2208 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2209 2210 switch (optname) { 2211 case IPV6_PKTINFO: 2212 if (pktopt && pktopt->ip6po_pktinfo) 2213 optdata = (void *)pktopt->ip6po_pktinfo; 2214 else { 2215 /* XXX: we don't have to do this every time... */ 2216 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2217 optdata = (void *)&null_pktinfo; 2218 } 2219 optdatalen = sizeof(struct in6_pktinfo); 2220 break; 2221 case IPV6_TCLASS: 2222 if (pktopt && pktopt->ip6po_tclass >= 0) 2223 optdata = (void *)&pktopt->ip6po_tclass; 2224 else 2225 optdata = (void *)&deftclass; 2226 optdatalen = sizeof(int); 2227 break; 2228 case IPV6_HOPOPTS: 2229 if (pktopt && pktopt->ip6po_hbh) { 2230 optdata = (void *)pktopt->ip6po_hbh; 2231 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2232 optdatalen = (ip6e->ip6e_len + 1) << 3; 2233 } 2234 break; 2235 case IPV6_RTHDR: 2236 if (pktopt && pktopt->ip6po_rthdr) { 2237 optdata = (void *)pktopt->ip6po_rthdr; 2238 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2239 optdatalen = (ip6e->ip6e_len + 1) << 3; 2240 } 2241 break; 2242 case IPV6_RTHDRDSTOPTS: 2243 if (pktopt && pktopt->ip6po_dest1) { 2244 optdata = (void *)pktopt->ip6po_dest1; 2245 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2246 optdatalen = (ip6e->ip6e_len + 1) << 3; 2247 } 2248 break; 2249 case IPV6_DSTOPTS: 2250 if (pktopt && pktopt->ip6po_dest2) { 2251 optdata = (void *)pktopt->ip6po_dest2; 2252 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2253 optdatalen = (ip6e->ip6e_len + 1) << 3; 2254 } 2255 break; 2256 case IPV6_NEXTHOP: 2257 if (pktopt && pktopt->ip6po_nexthop) { 2258 optdata = (void *)pktopt->ip6po_nexthop; 2259 optdatalen = pktopt->ip6po_nexthop->sa_len; 2260 } 2261 break; 2262 case IPV6_USE_MIN_MTU: 2263 if (pktopt) 2264 optdata = (void *)&pktopt->ip6po_minmtu; 2265 else 2266 optdata = (void *)&defminmtu; 2267 optdatalen = sizeof(int); 2268 break; 2269 case IPV6_DONTFRAG: 2270 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2271 on = 1; 2272 else 2273 on = 0; 2274 optdata = (void *)&on; 2275 optdatalen = sizeof(on); 2276 break; 2277 case IPV6_PREFER_TEMPADDR: 2278 if (pktopt) 2279 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2280 else 2281 optdata = (void *)&defpreftemp; 2282 optdatalen = sizeof(int); 2283 break; 2284 default: /* should not happen */ 2285 #ifdef DIAGNOSTIC 2286 panic("ip6_getpcbopt: unexpected option"); 2287 #endif 2288 return (ENOPROTOOPT); 2289 } 2290 2291 soopt_from_kbuf(sopt, optdata, optdatalen); 2292 2293 return (error); 2294 } 2295 2296 /* 2297 * initialize ip6_pktopts. beware that there are non-zero default values in 2298 * the struct. 2299 */ 2300 2301 static int 2302 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2303 { 2304 struct ip6_pktopts *opt; 2305 int priv =0; 2306 if (*pktopt == NULL) { 2307 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2308 init_ip6pktopts(*pktopt); 2309 } 2310 opt = *pktopt; 2311 2312 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2313 } 2314 2315 /* 2316 * initialize ip6_pktopts. beware that there are non-zero default values in 2317 * the struct. 2318 */ 2319 void 2320 init_ip6pktopts(struct ip6_pktopts *opt) 2321 { 2322 2323 bzero(opt, sizeof(*opt)); 2324 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2325 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2326 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2327 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2328 } 2329 2330 void 2331 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2332 { 2333 if (pktopt == NULL) 2334 return; 2335 2336 if (optname == -1 || optname == IPV6_PKTINFO) { 2337 if (pktopt->ip6po_pktinfo) 2338 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2339 pktopt->ip6po_pktinfo = NULL; 2340 } 2341 if (optname == -1 || optname == IPV6_HOPLIMIT) 2342 pktopt->ip6po_hlim = -1; 2343 if (optname == -1 || optname == IPV6_TCLASS) 2344 pktopt->ip6po_tclass = -1; 2345 if (optname == -1 || optname == IPV6_NEXTHOP) { 2346 if (pktopt->ip6po_nextroute.ro_rt) { 2347 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2348 pktopt->ip6po_nextroute.ro_rt = NULL; 2349 } 2350 if (pktopt->ip6po_nexthop) 2351 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2352 pktopt->ip6po_nexthop = NULL; 2353 } 2354 if (optname == -1 || optname == IPV6_HOPOPTS) { 2355 if (pktopt->ip6po_hbh) 2356 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2357 pktopt->ip6po_hbh = NULL; 2358 } 2359 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2360 if (pktopt->ip6po_dest1) 2361 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2362 pktopt->ip6po_dest1 = NULL; 2363 } 2364 if (optname == -1 || optname == IPV6_RTHDR) { 2365 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2366 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2367 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2368 if (pktopt->ip6po_route.ro_rt) { 2369 RTFREE(pktopt->ip6po_route.ro_rt); 2370 pktopt->ip6po_route.ro_rt = NULL; 2371 } 2372 } 2373 if (optname == -1 || optname == IPV6_DSTOPTS) { 2374 if (pktopt->ip6po_dest2) 2375 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2376 pktopt->ip6po_dest2 = NULL; 2377 } 2378 } 2379 2380 #define PKTOPT_EXTHDRCPY(type) \ 2381 do {\ 2382 if (src->type) {\ 2383 int hlen =\ 2384 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2385 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2386 if (dst->type == NULL)\ 2387 goto bad;\ 2388 bcopy(src->type, dst->type, hlen);\ 2389 }\ 2390 } while (0) 2391 2392 struct ip6_pktopts * 2393 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2394 { 2395 struct ip6_pktopts *dst; 2396 2397 if (src == NULL) { 2398 kprintf("ip6_clearpktopts: invalid argument\n"); 2399 return (NULL); 2400 } 2401 2402 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2403 if (dst == NULL) 2404 return (NULL); 2405 2406 dst->ip6po_hlim = src->ip6po_hlim; 2407 if (src->ip6po_pktinfo) { 2408 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2409 M_IP6OPT, canwait); 2410 if (dst->ip6po_pktinfo == NULL) 2411 goto bad; 2412 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2413 } 2414 if (src->ip6po_nexthop) { 2415 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2416 M_IP6OPT, canwait); 2417 if (dst->ip6po_nexthop == NULL) 2418 goto bad; 2419 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2420 src->ip6po_nexthop->sa_len); 2421 } 2422 PKTOPT_EXTHDRCPY(ip6po_hbh); 2423 PKTOPT_EXTHDRCPY(ip6po_dest1); 2424 PKTOPT_EXTHDRCPY(ip6po_dest2); 2425 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2426 return (dst); 2427 2428 bad: 2429 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2430 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2431 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2432 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2433 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2434 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2435 kfree(dst, M_IP6OPT); 2436 return (NULL); 2437 } 2438 2439 static int 2440 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2441 { 2442 if (dst == NULL || src == NULL) { 2443 #ifdef DIAGNOSTIC 2444 kprintf("ip6_clearpktopts: invalid argument\n"); 2445 #endif 2446 return (EINVAL); 2447 } 2448 2449 dst->ip6po_hlim = src->ip6po_hlim; 2450 dst->ip6po_tclass = src->ip6po_tclass; 2451 dst->ip6po_flags = src->ip6po_flags; 2452 if (src->ip6po_pktinfo) { 2453 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2454 M_IP6OPT, canwait); 2455 if (dst->ip6po_pktinfo == NULL) 2456 goto bad; 2457 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2458 } 2459 if (src->ip6po_nexthop) { 2460 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2461 M_IP6OPT, canwait); 2462 if (dst->ip6po_nexthop == NULL) 2463 goto bad; 2464 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2465 src->ip6po_nexthop->sa_len); 2466 } 2467 PKTOPT_EXTHDRCPY(ip6po_hbh); 2468 PKTOPT_EXTHDRCPY(ip6po_dest1); 2469 PKTOPT_EXTHDRCPY(ip6po_dest2); 2470 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2471 return (0); 2472 2473 bad: 2474 ip6_clearpktopts(dst, -1); 2475 return (ENOBUFS); 2476 } 2477 #undef PKTOPT_EXTHDRCPY 2478 2479 void 2480 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2481 { 2482 if (pktopt == NULL) 2483 return; 2484 2485 ip6_clearpktopts(pktopt, -1); 2486 2487 kfree(pktopt, M_IP6OPT); 2488 } 2489 2490 /* 2491 * Set the IP6 multicast options in response to user setsockopt(). 2492 */ 2493 static int 2494 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2495 { 2496 int error = 0; 2497 u_int loop, ifindex; 2498 struct ipv6_mreq *mreq; 2499 struct ifnet *ifp; 2500 struct ip6_moptions *im6o = *im6op; 2501 struct route_in6 ro; 2502 struct sockaddr_in6 *dst; 2503 struct in6_multi_mship *imm; 2504 struct thread *td = curthread; /* XXX */ 2505 2506 if (im6o == NULL) { 2507 /* 2508 * No multicast option buffer attached to the pcb; 2509 * allocate one and initialize to default values. 2510 */ 2511 im6o = (struct ip6_moptions *) 2512 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2513 2514 *im6op = im6o; 2515 im6o->im6o_multicast_ifp = NULL; 2516 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2517 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2518 LIST_INIT(&im6o->im6o_memberships); 2519 } 2520 2521 switch (optname) { 2522 2523 case IPV6_MULTICAST_IF: 2524 /* 2525 * Select the interface for outgoing multicast packets. 2526 */ 2527 if (m == NULL || m->m_len != sizeof(u_int)) { 2528 error = EINVAL; 2529 break; 2530 } 2531 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2532 if (ifindex < 0 || if_index < ifindex) { 2533 error = ENXIO; /* XXX EINVAL? */ 2534 break; 2535 } 2536 ifp = ifindex2ifnet[ifindex]; 2537 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2538 error = EADDRNOTAVAIL; 2539 break; 2540 } 2541 im6o->im6o_multicast_ifp = ifp; 2542 break; 2543 2544 case IPV6_MULTICAST_HOPS: 2545 { 2546 /* 2547 * Set the IP6 hoplimit for outgoing multicast packets. 2548 */ 2549 int optval; 2550 if (m == NULL || m->m_len != sizeof(int)) { 2551 error = EINVAL; 2552 break; 2553 } 2554 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2555 if (optval < -1 || optval >= 256) 2556 error = EINVAL; 2557 else if (optval == -1) 2558 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2559 else 2560 im6o->im6o_multicast_hlim = optval; 2561 break; 2562 } 2563 2564 case IPV6_MULTICAST_LOOP: 2565 /* 2566 * Set the loopback flag for outgoing multicast packets. 2567 * Must be zero or one. 2568 */ 2569 if (m == NULL || m->m_len != sizeof(u_int)) { 2570 error = EINVAL; 2571 break; 2572 } 2573 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2574 if (loop > 1) { 2575 error = EINVAL; 2576 break; 2577 } 2578 im6o->im6o_multicast_loop = loop; 2579 break; 2580 2581 case IPV6_JOIN_GROUP: 2582 /* 2583 * Add a multicast group membership. 2584 * Group must be a valid IP6 multicast address. 2585 */ 2586 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2587 error = EINVAL; 2588 break; 2589 } 2590 mreq = mtod(m, struct ipv6_mreq *); 2591 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2592 /* 2593 * We use the unspecified address to specify to accept 2594 * all multicast addresses. Only super user is allowed 2595 * to do this. 2596 */ 2597 if (priv_check(td, PRIV_ROOT)) 2598 { 2599 error = EACCES; 2600 break; 2601 } 2602 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2603 error = EINVAL; 2604 break; 2605 } 2606 2607 /* 2608 * If the interface is specified, validate it. 2609 */ 2610 if (mreq->ipv6mr_interface < 0 2611 || if_index < mreq->ipv6mr_interface) { 2612 error = ENXIO; /* XXX EINVAL? */ 2613 break; 2614 } 2615 /* 2616 * If no interface was explicitly specified, choose an 2617 * appropriate one according to the given multicast address. 2618 */ 2619 if (mreq->ipv6mr_interface == 0) { 2620 /* 2621 * If the multicast address is in node-local scope, 2622 * the interface should be a loopback interface. 2623 * Otherwise, look up the routing table for the 2624 * address, and choose the outgoing interface. 2625 * XXX: is it a good approach? 2626 */ 2627 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2628 ifp = &loif[0]; 2629 } else { 2630 ro.ro_rt = NULL; 2631 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2632 bzero(dst, sizeof(*dst)); 2633 dst->sin6_len = sizeof(struct sockaddr_in6); 2634 dst->sin6_family = AF_INET6; 2635 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2636 rtalloc((struct route *)&ro); 2637 if (ro.ro_rt == NULL) { 2638 error = EADDRNOTAVAIL; 2639 break; 2640 } 2641 ifp = ro.ro_rt->rt_ifp; 2642 rtfree(ro.ro_rt); 2643 } 2644 } else 2645 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2646 2647 /* 2648 * See if we found an interface, and confirm that it 2649 * supports multicast 2650 */ 2651 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2652 error = EADDRNOTAVAIL; 2653 break; 2654 } 2655 /* 2656 * Put interface index into the multicast address, 2657 * if the address has link-local scope. 2658 */ 2659 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2660 mreq->ipv6mr_multiaddr.s6_addr16[1] 2661 = htons(mreq->ipv6mr_interface); 2662 } 2663 /* 2664 * See if the membership already exists. 2665 */ 2666 for (imm = im6o->im6o_memberships.lh_first; 2667 imm != NULL; imm = imm->i6mm_chain.le_next) 2668 if (imm->i6mm_maddr->in6m_ifp == ifp && 2669 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2670 &mreq->ipv6mr_multiaddr)) 2671 break; 2672 if (imm != NULL) { 2673 error = EADDRINUSE; 2674 break; 2675 } 2676 /* 2677 * Everything looks good; add a new record to the multicast 2678 * address list for the given interface. 2679 */ 2680 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2681 if ((imm->i6mm_maddr = 2682 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2683 kfree(imm, M_IPMADDR); 2684 break; 2685 } 2686 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2687 break; 2688 2689 case IPV6_LEAVE_GROUP: 2690 /* 2691 * Drop a multicast group membership. 2692 * Group must be a valid IP6 multicast address. 2693 */ 2694 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2695 error = EINVAL; 2696 break; 2697 } 2698 mreq = mtod(m, struct ipv6_mreq *); 2699 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2700 if (priv_check(td, PRIV_ROOT)) { 2701 error = EACCES; 2702 break; 2703 } 2704 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2705 error = EINVAL; 2706 break; 2707 } 2708 /* 2709 * If an interface address was specified, get a pointer 2710 * to its ifnet structure. 2711 */ 2712 if (mreq->ipv6mr_interface < 0 2713 || if_index < mreq->ipv6mr_interface) { 2714 error = ENXIO; /* XXX EINVAL? */ 2715 break; 2716 } 2717 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2718 /* 2719 * Put interface index into the multicast address, 2720 * if the address has link-local scope. 2721 */ 2722 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2723 mreq->ipv6mr_multiaddr.s6_addr16[1] 2724 = htons(mreq->ipv6mr_interface); 2725 } 2726 /* 2727 * Find the membership in the membership list. 2728 */ 2729 for (imm = im6o->im6o_memberships.lh_first; 2730 imm != NULL; imm = imm->i6mm_chain.le_next) { 2731 if ((ifp == NULL || 2732 imm->i6mm_maddr->in6m_ifp == ifp) && 2733 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2734 &mreq->ipv6mr_multiaddr)) 2735 break; 2736 } 2737 if (imm == NULL) { 2738 /* Unable to resolve interface */ 2739 error = EADDRNOTAVAIL; 2740 break; 2741 } 2742 /* 2743 * Give up the multicast address record to which the 2744 * membership points. 2745 */ 2746 LIST_REMOVE(imm, i6mm_chain); 2747 in6_delmulti(imm->i6mm_maddr); 2748 kfree(imm, M_IPMADDR); 2749 break; 2750 2751 default: 2752 error = EOPNOTSUPP; 2753 break; 2754 } 2755 2756 /* 2757 * If all options have default values, no need to keep the mbuf. 2758 */ 2759 if (im6o->im6o_multicast_ifp == NULL && 2760 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2761 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2762 im6o->im6o_memberships.lh_first == NULL) { 2763 kfree(*im6op, M_IPMOPTS); 2764 *im6op = NULL; 2765 } 2766 2767 return (error); 2768 } 2769 2770 /* 2771 * Return the IP6 multicast options in response to user getsockopt(). 2772 */ 2773 static int 2774 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2775 { 2776 u_int *hlim, *loop, *ifindex; 2777 2778 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2779 2780 switch (optname) { 2781 2782 case IPV6_MULTICAST_IF: 2783 ifindex = mtod(*mp, u_int *); 2784 (*mp)->m_len = sizeof(u_int); 2785 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2786 *ifindex = 0; 2787 else 2788 *ifindex = im6o->im6o_multicast_ifp->if_index; 2789 return (0); 2790 2791 case IPV6_MULTICAST_HOPS: 2792 hlim = mtod(*mp, u_int *); 2793 (*mp)->m_len = sizeof(u_int); 2794 if (im6o == NULL) 2795 *hlim = ip6_defmcasthlim; 2796 else 2797 *hlim = im6o->im6o_multicast_hlim; 2798 return (0); 2799 2800 case IPV6_MULTICAST_LOOP: 2801 loop = mtod(*mp, u_int *); 2802 (*mp)->m_len = sizeof(u_int); 2803 if (im6o == NULL) 2804 *loop = ip6_defmcasthlim; 2805 else 2806 *loop = im6o->im6o_multicast_loop; 2807 return (0); 2808 2809 default: 2810 return (EOPNOTSUPP); 2811 } 2812 } 2813 2814 /* 2815 * Discard the IP6 multicast options. 2816 */ 2817 void 2818 ip6_freemoptions(struct ip6_moptions *im6o) 2819 { 2820 struct in6_multi_mship *imm; 2821 2822 if (im6o == NULL) 2823 return; 2824 2825 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2826 LIST_REMOVE(imm, i6mm_chain); 2827 if (imm->i6mm_maddr) 2828 in6_delmulti(imm->i6mm_maddr); 2829 kfree(imm, M_IPMADDR); 2830 } 2831 kfree(im6o, M_IPMOPTS); 2832 } 2833 2834 /* 2835 * Set a particular packet option, as a sticky option or an ancillary data 2836 * item. "len" can be 0 only when it's a sticky option. 2837 * We have 4 cases of combination of "sticky" and "cmsg": 2838 * "sticky=0, cmsg=0": impossible 2839 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2840 * "sticky=1, cmsg=0": RFC3542 socket option 2841 * "sticky=1, cmsg=1": RFC2292 socket option 2842 */ 2843 static int 2844 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2845 int sticky, int cmsg, int uproto, int priv) 2846 { 2847 int minmtupolicy, preftemp; 2848 //int error; 2849 2850 if (!sticky && !cmsg) { 2851 kprintf("ip6_setpktoption: impossible case\n"); 2852 return (EINVAL); 2853 } 2854 2855 /* 2856 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2857 * not be specified in the context of RFC3542. Conversely, 2858 * RFC3542 types should not be specified in the context of RFC2292. 2859 */ 2860 if (!cmsg) { 2861 switch (optname) { 2862 case IPV6_2292PKTINFO: 2863 case IPV6_2292HOPLIMIT: 2864 case IPV6_2292NEXTHOP: 2865 case IPV6_2292HOPOPTS: 2866 case IPV6_2292DSTOPTS: 2867 case IPV6_2292RTHDR: 2868 case IPV6_2292PKTOPTIONS: 2869 return (ENOPROTOOPT); 2870 } 2871 } 2872 if (sticky && cmsg) { 2873 switch (optname) { 2874 case IPV6_PKTINFO: 2875 case IPV6_HOPLIMIT: 2876 case IPV6_NEXTHOP: 2877 case IPV6_HOPOPTS: 2878 case IPV6_DSTOPTS: 2879 case IPV6_RTHDRDSTOPTS: 2880 case IPV6_RTHDR: 2881 case IPV6_USE_MIN_MTU: 2882 case IPV6_DONTFRAG: 2883 case IPV6_TCLASS: 2884 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2885 return (ENOPROTOOPT); 2886 } 2887 } 2888 2889 switch (optname) { 2890 case IPV6_2292PKTINFO: 2891 case IPV6_PKTINFO: 2892 { 2893 struct in6_pktinfo *pktinfo; 2894 if (len != sizeof(struct in6_pktinfo)) 2895 return (EINVAL); 2896 pktinfo = (struct in6_pktinfo *)buf; 2897 2898 /* 2899 * An application can clear any sticky IPV6_PKTINFO option by 2900 * doing a "regular" setsockopt with ipi6_addr being 2901 * in6addr_any and ipi6_ifindex being zero. 2902 * [RFC 3542, Section 6] 2903 */ 2904 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2905 pktinfo->ipi6_ifindex == 0 && 2906 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2907 ip6_clearpktopts(opt, optname); 2908 break; 2909 } 2910 2911 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2912 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2913 return (EINVAL); 2914 } 2915 2916 /* validate the interface index if specified. */ 2917 if (pktinfo->ipi6_ifindex > if_index || 2918 pktinfo->ipi6_ifindex < 0) { 2919 return (ENXIO); 2920 } 2921 /* 2922 * Check if the requested source address is indeed a 2923 * unicast address assigned to the node, and can be 2924 * used as the packet's source address. 2925 */ 2926 if (opt->ip6po_pktinfo != NULL && 2927 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2928 struct in6_ifaddr *ia6; 2929 struct sockaddr_in6 sin6; 2930 2931 bzero(&sin6, sizeof(sin6)); 2932 sin6.sin6_len = sizeof(sin6); 2933 sin6.sin6_family = AF_INET6; 2934 sin6.sin6_addr = 2935 opt->ip6po_pktinfo->ipi6_addr; 2936 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2937 if (ia6 == NULL || 2938 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2939 IN6_IFF_NOTREADY)) != 0) 2940 return (EADDRNOTAVAIL); 2941 } 2942 2943 /* 2944 * We store the address anyway, and let in6_selectsrc() 2945 * validate the specified address. This is because ipi6_addr 2946 * may not have enough information about its scope zone, and 2947 * we may need additional information (such as outgoing 2948 * interface or the scope zone of a destination address) to 2949 * disambiguate the scope. 2950 * XXX: the delay of the validation may confuse the 2951 * application when it is used as a sticky option. 2952 */ 2953 if (opt->ip6po_pktinfo == NULL) { 2954 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2955 M_IP6OPT, M_NOWAIT); 2956 if (opt->ip6po_pktinfo == NULL) 2957 return (ENOBUFS); 2958 } 2959 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2960 break; 2961 } 2962 2963 case IPV6_2292HOPLIMIT: 2964 case IPV6_HOPLIMIT: 2965 { 2966 int *hlimp; 2967 2968 /* 2969 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2970 * to simplify the ordering among hoplimit options. 2971 */ 2972 if (optname == IPV6_HOPLIMIT && sticky) 2973 return (ENOPROTOOPT); 2974 2975 if (len != sizeof(int)) 2976 return (EINVAL); 2977 hlimp = (int *)buf; 2978 if (*hlimp < -1 || *hlimp > 255) 2979 return (EINVAL); 2980 2981 opt->ip6po_hlim = *hlimp; 2982 break; 2983 } 2984 2985 case IPV6_TCLASS: 2986 { 2987 int tclass; 2988 2989 if (len != sizeof(int)) 2990 return (EINVAL); 2991 tclass = *(int *)buf; 2992 if (tclass < -1 || tclass > 255) 2993 return (EINVAL); 2994 2995 opt->ip6po_tclass = tclass; 2996 break; 2997 } 2998 2999 case IPV6_2292NEXTHOP: 3000 case IPV6_NEXTHOP: 3001 if (!priv) 3002 return (EPERM); 3003 3004 if (len == 0) { /* just remove the option */ 3005 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3006 break; 3007 } 3008 3009 /* check if cmsg_len is large enough for sa_len */ 3010 if (len < sizeof(struct sockaddr) || len < *buf) 3011 return (EINVAL); 3012 3013 switch (((struct sockaddr *)buf)->sa_family) { 3014 case AF_INET6: 3015 { 3016 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3017 //int error; 3018 3019 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3020 return (EINVAL); 3021 3022 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3023 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3024 return (EINVAL); 3025 } 3026 break; 3027 } 3028 case AF_LINK: /* should eventually be supported */ 3029 default: 3030 return (EAFNOSUPPORT); 3031 } 3032 3033 /* turn off the previous option, then set the new option. */ 3034 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3035 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3036 if (opt->ip6po_nexthop == NULL) 3037 return (ENOBUFS); 3038 bcopy(buf, opt->ip6po_nexthop, *buf); 3039 break; 3040 3041 case IPV6_2292HOPOPTS: 3042 case IPV6_HOPOPTS: 3043 { 3044 struct ip6_hbh *hbh; 3045 int hbhlen; 3046 3047 /* 3048 * XXX: We don't allow a non-privileged user to set ANY HbH 3049 * options, since per-option restriction has too much 3050 * overhead. 3051 */ 3052 if (!priv) 3053 return (EPERM); 3054 if (len == 0) { 3055 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3056 break; /* just remove the option */ 3057 } 3058 3059 /* message length validation */ 3060 if (len < sizeof(struct ip6_hbh)) 3061 return (EINVAL); 3062 hbh = (struct ip6_hbh *)buf; 3063 hbhlen = (hbh->ip6h_len + 1) << 3; 3064 if (len != hbhlen) 3065 return (EINVAL); 3066 3067 /* turn off the previous option, then set the new option. */ 3068 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3069 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3070 if (opt->ip6po_hbh == NULL) 3071 return (ENOBUFS); 3072 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3073 3074 break; 3075 } 3076 3077 case IPV6_2292DSTOPTS: 3078 case IPV6_DSTOPTS: 3079 case IPV6_RTHDRDSTOPTS: 3080 { 3081 struct ip6_dest *dest, **newdest = NULL; 3082 int destlen; 3083 if (!priv) 3084 return (EPERM); 3085 3086 if (len == 0) { 3087 ip6_clearpktopts(opt, optname); 3088 break; /* just remove the option */ 3089 } 3090 3091 /* message length validation */ 3092 if (len < sizeof(struct ip6_dest)) 3093 return (EINVAL); 3094 dest = (struct ip6_dest *)buf; 3095 destlen = (dest->ip6d_len + 1) << 3; 3096 if (len != destlen) 3097 return (EINVAL); 3098 3099 /* 3100 * Determine the position that the destination options header 3101 * should be inserted; before or after the routing header. 3102 */ 3103 switch (optname) { 3104 case IPV6_2292DSTOPTS: 3105 /* 3106 * The old advacned API is ambiguous on this point. 3107 * Our approach is to determine the position based 3108 * according to the existence of a routing header. 3109 * Note, however, that this depends on the order of the 3110 * extension headers in the ancillary data; the 1st 3111 * part of the destination options header must appear 3112 * before the routing header in the ancillary data, 3113 * too. 3114 * RFC3542 solved the ambiguity by introducing 3115 * separate ancillary data or option types. 3116 */ 3117 if (opt->ip6po_rthdr == NULL) 3118 newdest = &opt->ip6po_dest1; 3119 else 3120 newdest = &opt->ip6po_dest2; 3121 break; 3122 case IPV6_RTHDRDSTOPTS: 3123 newdest = &opt->ip6po_dest1; 3124 break; 3125 case IPV6_DSTOPTS: 3126 newdest = &opt->ip6po_dest2; 3127 break; 3128 } 3129 3130 /* turn off the previous option, then set the new option. */ 3131 ip6_clearpktopts(opt, optname); 3132 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3133 if (*newdest == NULL) 3134 return (ENOBUFS); 3135 bcopy(dest, *newdest, destlen); 3136 3137 break; 3138 } 3139 3140 case IPV6_2292RTHDR: 3141 case IPV6_RTHDR: 3142 { 3143 struct ip6_rthdr *rth; 3144 int rthlen; 3145 3146 if (len == 0) { 3147 ip6_clearpktopts(opt, IPV6_RTHDR); 3148 break; /* just remove the option */ 3149 } 3150 3151 /* message length validation */ 3152 if (len < sizeof(struct ip6_rthdr)) 3153 return (EINVAL); 3154 rth = (struct ip6_rthdr *)buf; 3155 rthlen = (rth->ip6r_len + 1) << 3; 3156 if (len != rthlen) 3157 return (EINVAL); 3158 3159 switch (rth->ip6r_type) { 3160 default: 3161 return (EINVAL); /* not supported */ 3162 } 3163 3164 /* turn off the previous option */ 3165 ip6_clearpktopts(opt, IPV6_RTHDR); 3166 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3167 if (opt->ip6po_rthdr == NULL) 3168 return (ENOBUFS); 3169 bcopy(rth, opt->ip6po_rthdr, rthlen); 3170 3171 break; 3172 } 3173 3174 case IPV6_USE_MIN_MTU: 3175 if (len != sizeof(int)) 3176 return (EINVAL); 3177 minmtupolicy = *(int *)buf; 3178 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3179 minmtupolicy != IP6PO_MINMTU_DISABLE && 3180 minmtupolicy != IP6PO_MINMTU_ALL) { 3181 return (EINVAL); 3182 } 3183 opt->ip6po_minmtu = minmtupolicy; 3184 break; 3185 3186 case IPV6_DONTFRAG: 3187 if (len != sizeof(int)) 3188 return (EINVAL); 3189 3190 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3191 /* 3192 * we ignore this option for TCP sockets. 3193 * (RFC3542 leaves this case unspecified.) 3194 */ 3195 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3196 } else 3197 opt->ip6po_flags |= IP6PO_DONTFRAG; 3198 break; 3199 3200 case IPV6_PREFER_TEMPADDR: 3201 if (len != sizeof(int)) 3202 return (EINVAL); 3203 preftemp = *(int *)buf; 3204 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3205 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3206 preftemp != IP6PO_TEMPADDR_PREFER) { 3207 return (EINVAL); 3208 } 3209 opt->ip6po_prefer_tempaddr = preftemp; 3210 break; 3211 3212 default: 3213 return (ENOPROTOOPT); 3214 } /* end of switch */ 3215 3216 return (0); 3217 } 3218 3219 3220 /* 3221 * Set IPv6 outgoing packet options based on advanced API. 3222 */ 3223 int 3224 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3225 struct ip6_pktopts *stickyopt, int uproto, int priv) 3226 { 3227 struct cmsghdr *cm = NULL; 3228 3229 if (control == NULL || opt == NULL) 3230 return (EINVAL); 3231 3232 init_ip6pktopts(opt); 3233 3234 /* 3235 * XXX: Currently, we assume all the optional information is stored 3236 * in a single mbuf. 3237 */ 3238 if (stickyopt) { 3239 int error; 3240 3241 /* 3242 * If stickyopt is provided, make a local copy of the options 3243 * for this particular packet, then override them by ancillary 3244 * objects. 3245 * XXX: copypktopts() does not copy the cached route to a next 3246 * hop (if any). This is not very good in terms of efficiency, 3247 * but we can allow this since this option should be rarely 3248 * used. 3249 */ 3250 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3251 return (error); 3252 } 3253 3254 /* 3255 * XXX: Currently, we assume all the optional information is stored 3256 * in a single mbuf. 3257 */ 3258 if (control->m_next) 3259 return (EINVAL); 3260 3261 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3262 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3263 int error; 3264 3265 if (control->m_len < CMSG_LEN(0)) 3266 return (EINVAL); 3267 3268 cm = mtod(control, struct cmsghdr *); 3269 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3270 return (EINVAL); 3271 if (cm->cmsg_level != IPPROTO_IPV6) 3272 continue; 3273 3274 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3275 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3276 if (error) 3277 return (error); 3278 } 3279 3280 return (0); 3281 } 3282 3283 /* 3284 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3285 * packet to the input queue of a specified interface. Note that this 3286 * calls the output routine of the loopback "driver", but with an interface 3287 * pointer that might NOT be &loif -- easier than replicating that code here. 3288 */ 3289 void 3290 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3291 { 3292 struct mbuf *copym; 3293 struct ip6_hdr *ip6; 3294 3295 copym = m_copy(m, 0, M_COPYALL); 3296 if (copym == NULL) 3297 return; 3298 3299 /* 3300 * Make sure to deep-copy IPv6 header portion in case the data 3301 * is in an mbuf cluster, so that we can safely override the IPv6 3302 * header portion later. 3303 */ 3304 if ((copym->m_flags & M_EXT) != 0 || 3305 copym->m_len < sizeof(struct ip6_hdr)) { 3306 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3307 if (copym == NULL) 3308 return; 3309 } 3310 3311 #ifdef DIAGNOSTIC 3312 if (copym->m_len < sizeof(*ip6)) { 3313 m_freem(copym); 3314 return; 3315 } 3316 #endif 3317 3318 ip6 = mtod(copym, struct ip6_hdr *); 3319 /* 3320 * clear embedded scope identifiers if necessary. 3321 * in6_clearscope will touch the addresses only when necessary. 3322 */ 3323 in6_clearscope(&ip6->ip6_src); 3324 in6_clearscope(&ip6->ip6_dst); 3325 3326 if_simloop(ifp, copym, dst->sin6_family, 0); 3327 } 3328 3329 /* 3330 * Separate the IPv6 header from the payload into its own mbuf. 3331 * 3332 * Returns the new mbuf chain or the original mbuf if no payload. 3333 * Returns NULL if can't allocate new mbuf for header. 3334 */ 3335 static struct mbuf * 3336 ip6_splithdr(struct mbuf *m) 3337 { 3338 struct mbuf *mh; 3339 3340 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3341 return (m); 3342 3343 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 3344 if (mh == NULL) 3345 return (NULL); 3346 mh->m_len = sizeof(struct ip6_hdr); 3347 M_MOVE_PKTHDR(mh, m); 3348 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3349 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3350 m->m_data += sizeof(struct ip6_hdr); 3351 m->m_len -= sizeof(struct ip6_hdr); 3352 mh->m_next = m; 3353 return (mh); 3354 } 3355 3356 /* 3357 * Compute IPv6 extension header length. 3358 */ 3359 int 3360 ip6_optlen(struct in6pcb *in6p) 3361 { 3362 int len; 3363 3364 if (!in6p->in6p_outputopts) 3365 return 0; 3366 3367 len = 0; 3368 #define elen(x) \ 3369 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3370 3371 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3372 if (in6p->in6p_outputopts->ip6po_rthdr) 3373 /* dest1 is valid with rthdr only */ 3374 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3375 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3376 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3377 return len; 3378 #undef elen 3379 } 3380