ip6_output.c revision 100508
1/* $FreeBSD: head/sys/netinet6/ip6_output.c 100508 2002-07-22 15:51:02Z ume $ */ 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#include "opt_pfil_hooks.h" 73 74#include <sys/param.h> 75#include <sys/malloc.h> 76#include <sys/mbuf.h> 77#include <sys/proc.h> 78#include <sys/errno.h> 79#include <sys/protosw.h> 80#include <sys/socket.h> 81#include <sys/socketvar.h> 82#include <sys/systm.h> 83#include <sys/kernel.h> 84 85#include <net/if.h> 86#include <net/route.h> 87#ifdef PFIL_HOOKS 88#include <net/pfil.h> 89#endif 90 91#include <netinet/in.h> 92#include <netinet/in_var.h> 93#include <netinet6/in6_var.h> 94#include <netinet/ip6.h> 95#include <netinet/icmp6.h> 96#include <netinet6/ip6_var.h> 97#include <netinet/in_pcb.h> 98#include <netinet6/nd6.h> 99 100#ifdef IPSEC 101#include <netinet6/ipsec.h> 102#ifdef INET6 103#include <netinet6/ipsec6.h> 104#endif 105#include <netkey/key.h> 106#endif /* IPSEC */ 107 108#include <netinet6/ip6_fw.h> 109 110#include <net/net_osdep.h> 111 112#include <netinet6/ip6protosw.h> 113 114static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 115 116struct ip6_exthdrs { 117 struct mbuf *ip6e_ip6; 118 struct mbuf *ip6e_hbh; 119 struct mbuf *ip6e_dest1; 120 struct mbuf *ip6e_rthdr; 121 struct mbuf *ip6e_dest2; 122}; 123 124static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 125 struct socket *, struct sockopt *sopt)); 126static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 127static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 128static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 129static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 130 struct ip6_frag **)); 131static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 132static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 133 134/* 135 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 136 * header (with pri, len, nxt, hlim, src, dst). 137 * This function may modify ver and hlim only. 138 * The mbuf chain containing the packet will be freed. 139 * The mbuf opt, if present, will not be freed. 140 * 141 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 142 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 143 * which is rt_rmx.rmx_mtu. 144 */ 145int 146ip6_output(m0, opt, ro, flags, im6o, ifpp) 147 struct mbuf *m0; 148 struct ip6_pktopts *opt; 149 struct route_in6 *ro; 150 int flags; 151 struct ip6_moptions *im6o; 152 struct ifnet **ifpp; /* XXX: just for statistics */ 153{ 154 struct ip6_hdr *ip6, *mhip6; 155 struct ifnet *ifp, *origifp; 156 struct mbuf *m = m0; 157 int hlen, tlen, len, off; 158 struct route_in6 ip6route; 159 struct sockaddr_in6 *dst; 160 int error = 0; 161 struct in6_ifaddr *ia = NULL; 162 u_long mtu; 163 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 164 struct ip6_exthdrs exthdrs; 165 struct in6_addr finaldst; 166 struct route_in6 *ro_pmtu = NULL; 167 int hdrsplit = 0; 168 int needipsec = 0; 169#ifdef PFIL_HOOKS 170 struct packet_filter_hook *pfh; 171 struct mbuf *m1; 172 int rv; 173#endif /* PFIL_HOOKS */ 174#ifdef IPSEC 175 int needipsectun = 0; 176 struct socket *so; 177 struct secpolicy *sp = NULL; 178 179 /* for AH processing. stupid to have "socket" variable in IP layer... */ 180 so = ipsec_getsocket(m); 181 (void)ipsec_setsocket(m, NULL); 182 ip6 = mtod(m, struct ip6_hdr *); 183#endif /* IPSEC */ 184 185#define MAKE_EXTHDR(hp, mp) \ 186 do { \ 187 if (hp) { \ 188 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 189 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 190 ((eh)->ip6e_len + 1) << 3); \ 191 if (error) \ 192 goto freehdrs; \ 193 } \ 194 } while (0) 195 196 bzero(&exthdrs, sizeof(exthdrs)); 197 198 if (opt) { 199 /* Hop-by-Hop options header */ 200 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 201 /* Destination options header(1st part) */ 202 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 203 /* Routing header */ 204 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 205 /* Destination options header(2nd part) */ 206 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 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 = 0; 236 break; 237 238 case IPSEC_POLICY_IPSEC: 239 if (sp->req == NULL) { 240 /* acquire a policy */ 241 error = key_spdacquire(sp); 242 goto freehdrs; 243 } 244 needipsec = 1; 245 break; 246 247 case IPSEC_POLICY_ENTRUST: 248 default: 249 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 250 } 251#endif /* IPSEC */ 252 253 /* 254 * Calculate the total length of the extension header chain. 255 * Keep the length of the unfragmentable part for fragmentation. 256 */ 257 optlen = 0; 258 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 259 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 260 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 261 unfragpartlen = optlen + sizeof(struct ip6_hdr); 262 /* NOTE: we don't add AH/ESP length here. do that later. */ 263 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 264 265 /* 266 * If we need IPsec, or there is at least one extension header, 267 * separate IP6 header from the payload. 268 */ 269 if ((needipsec || optlen) && !hdrsplit) { 270 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 271 m = NULL; 272 goto freehdrs; 273 } 274 m = exthdrs.ip6e_ip6; 275 hdrsplit++; 276 } 277 278 /* adjust pointer */ 279 ip6 = mtod(m, struct ip6_hdr *); 280 281 /* adjust mbuf packet header length */ 282 m->m_pkthdr.len += optlen; 283 plen = m->m_pkthdr.len - sizeof(*ip6); 284 285 /* If this is a jumbo payload, insert a jumbo payload option. */ 286 if (plen > IPV6_MAXPACKET) { 287 if (!hdrsplit) { 288 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 289 m = NULL; 290 goto freehdrs; 291 } 292 m = exthdrs.ip6e_ip6; 293 hdrsplit++; 294 } 295 /* adjust pointer */ 296 ip6 = mtod(m, struct ip6_hdr *); 297 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 298 goto freehdrs; 299 ip6->ip6_plen = 0; 300 } else 301 ip6->ip6_plen = htons(plen); 302 303 /* 304 * Concatenate headers and fill in next header fields. 305 * Here we have, on "m" 306 * IPv6 payload 307 * and we insert headers accordingly. Finally, we should be getting: 308 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 309 * 310 * during the header composing process, "m" points to IPv6 header. 311 * "mprev" points to an extension header prior to esp. 312 */ 313 { 314 u_char *nexthdrp = &ip6->ip6_nxt; 315 struct mbuf *mprev = m; 316 317 /* 318 * we treat dest2 specially. this makes IPsec processing 319 * much easier. the goal here is to make mprev point the 320 * mbuf prior to dest2. 321 * 322 * result: IPv6 dest2 payload 323 * m and mprev will point to IPv6 header. 324 */ 325 if (exthdrs.ip6e_dest2) { 326 if (!hdrsplit) 327 panic("assumption failed: hdr not split"); 328 exthdrs.ip6e_dest2->m_next = m->m_next; 329 m->m_next = exthdrs.ip6e_dest2; 330 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 331 ip6->ip6_nxt = IPPROTO_DSTOPTS; 332 } 333 334#define MAKE_CHAIN(m, mp, p, i)\ 335 do {\ 336 if (m) {\ 337 if (!hdrsplit) \ 338 panic("assumption failed: hdr not split"); \ 339 *mtod((m), u_char *) = *(p);\ 340 *(p) = (i);\ 341 p = mtod((m), u_char *);\ 342 (m)->m_next = (mp)->m_next;\ 343 (mp)->m_next = (m);\ 344 (mp) = (m);\ 345 }\ 346 } while (0) 347 /* 348 * result: IPv6 hbh dest1 rthdr dest2 payload 349 * m will point to IPv6 header. mprev will point to the 350 * extension header prior to dest2 (rthdr in the above case). 351 */ 352 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 353 nexthdrp, IPPROTO_HOPOPTS); 354 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 355 nexthdrp, IPPROTO_DSTOPTS); 356 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 357 nexthdrp, IPPROTO_ROUTING); 358 359#ifdef IPSEC 360 if (!needipsec) 361 goto skip_ipsec2; 362 363 /* 364 * pointers after IPsec headers are not valid any more. 365 * other pointers need a great care too. 366 * (IPsec routines should not mangle mbufs prior to AH/ESP) 367 */ 368 exthdrs.ip6e_dest2 = NULL; 369 370 { 371 struct ip6_rthdr *rh = NULL; 372 int segleft_org = 0; 373 struct ipsec_output_state state; 374 375 if (exthdrs.ip6e_rthdr) { 376 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 377 segleft_org = rh->ip6r_segleft; 378 rh->ip6r_segleft = 0; 379 } 380 381 bzero(&state, sizeof(state)); 382 state.m = m; 383 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 384 &needipsectun); 385 m = state.m; 386 if (error) { 387 /* mbuf is already reclaimed in ipsec6_output_trans. */ 388 m = NULL; 389 switch (error) { 390 case EHOSTUNREACH: 391 case ENETUNREACH: 392 case EMSGSIZE: 393 case ENOBUFS: 394 case ENOMEM: 395 break; 396 default: 397 printf("ip6_output (ipsec): error code %d\n", error); 398 /* fall through */ 399 case ENOENT: 400 /* don't show these error codes to the user */ 401 error = 0; 402 break; 403 } 404 goto bad; 405 } 406 if (exthdrs.ip6e_rthdr) { 407 /* ah6_output doesn't modify mbuf chain */ 408 rh->ip6r_segleft = segleft_org; 409 } 410 } 411skip_ipsec2:; 412#endif 413 } 414 415 /* 416 * If there is a routing header, replace destination address field 417 * with the first hop of the routing header. 418 */ 419 if (exthdrs.ip6e_rthdr) { 420 struct ip6_rthdr *rh = 421 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 422 struct ip6_rthdr *)); 423 struct ip6_rthdr0 *rh0; 424 425 finaldst = ip6->ip6_dst; 426 switch (rh->ip6r_type) { 427 case IPV6_RTHDR_TYPE_0: 428 rh0 = (struct ip6_rthdr0 *)rh; 429 ip6->ip6_dst = rh0->ip6r0_addr[0]; 430 bcopy((caddr_t)&rh0->ip6r0_addr[1], 431 (caddr_t)&rh0->ip6r0_addr[0], 432 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 433 ); 434 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 435 break; 436 default: /* is it possible? */ 437 error = EINVAL; 438 goto bad; 439 } 440 } 441 442 /* Source address validation */ 443 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 444 (flags & IPV6_DADOUTPUT) == 0) { 445 error = EOPNOTSUPP; 446 ip6stat.ip6s_badscope++; 447 goto bad; 448 } 449 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 450 error = EOPNOTSUPP; 451 ip6stat.ip6s_badscope++; 452 goto bad; 453 } 454 455 ip6stat.ip6s_localout++; 456 457 /* 458 * Route packet. 459 */ 460 if (ro == 0) { 461 ro = &ip6route; 462 bzero((caddr_t)ro, sizeof(*ro)); 463 } 464 ro_pmtu = ro; 465 if (opt && opt->ip6po_rthdr) 466 ro = &opt->ip6po_route; 467 dst = (struct sockaddr_in6 *)&ro->ro_dst; 468 /* 469 * If there is a cached route, 470 * check that it is to the same destination 471 * and is still up. If not, free it and try again. 472 */ 473 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 474 dst->sin6_family != AF_INET6 || 475 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 476 RTFREE(ro->ro_rt); 477 ro->ro_rt = (struct rtentry *)0; 478 } 479 if (ro->ro_rt == 0) { 480 bzero(dst, sizeof(*dst)); 481 dst->sin6_family = AF_INET6; 482 dst->sin6_len = sizeof(struct sockaddr_in6); 483 dst->sin6_addr = ip6->ip6_dst; 484#ifdef SCOPEDROUTING 485 /* XXX: sin6_scope_id should already be fixed at this point */ 486 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 487 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 488#endif 489 } 490#ifdef IPSEC 491 if (needipsec && needipsectun) { 492 struct ipsec_output_state state; 493 494 /* 495 * All the extension headers will become inaccessible 496 * (since they can be encrypted). 497 * Don't panic, we need no more updates to extension headers 498 * on inner IPv6 packet (since they are now encapsulated). 499 * 500 * IPv6 [ESP|AH] IPv6 [extension headers] payload 501 */ 502 bzero(&exthdrs, sizeof(exthdrs)); 503 exthdrs.ip6e_ip6 = m; 504 505 bzero(&state, sizeof(state)); 506 state.m = m; 507 state.ro = (struct route *)ro; 508 state.dst = (struct sockaddr *)dst; 509 510 error = ipsec6_output_tunnel(&state, sp, flags); 511 512 m = state.m; 513 ro = (struct route_in6 *)state.ro; 514 dst = (struct sockaddr_in6 *)state.dst; 515 if (error) { 516 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 517 m0 = m = NULL; 518 m = NULL; 519 switch (error) { 520 case EHOSTUNREACH: 521 case ENETUNREACH: 522 case EMSGSIZE: 523 case ENOBUFS: 524 case ENOMEM: 525 break; 526 default: 527 printf("ip6_output (ipsec): error code %d\n", error); 528 /* fall through */ 529 case ENOENT: 530 /* don't show these error codes to the user */ 531 error = 0; 532 break; 533 } 534 goto bad; 535 } 536 537 exthdrs.ip6e_ip6 = m; 538 } 539#endif /* IPSEC */ 540 541 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 542 /* Unicast */ 543 544#define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 545#define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 546 /* xxx 547 * interface selection comes here 548 * if an interface is specified from an upper layer, 549 * ifp must point it. 550 */ 551 if (ro->ro_rt == 0) { 552 /* 553 * non-bsdi always clone routes, if parent is 554 * PRF_CLONING. 555 */ 556 rtalloc((struct route *)ro); 557 } 558 if (ro->ro_rt == 0) { 559 ip6stat.ip6s_noroute++; 560 error = EHOSTUNREACH; 561 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 562 goto bad; 563 } 564 ia = ifatoia6(ro->ro_rt->rt_ifa); 565 ifp = ro->ro_rt->rt_ifp; 566 ro->ro_rt->rt_use++; 567 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 568 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 569 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 570 571 in6_ifstat_inc(ifp, ifs6_out_request); 572 573 /* 574 * Check if the outgoing interface conflicts with 575 * the interface specified by ifi6_ifindex (if specified). 576 * Note that loopback interface is always okay. 577 * (this may happen when we are sending a packet to one of 578 * our own addresses.) 579 */ 580 if (opt && opt->ip6po_pktinfo 581 && opt->ip6po_pktinfo->ipi6_ifindex) { 582 if (!(ifp->if_flags & IFF_LOOPBACK) 583 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 584 ip6stat.ip6s_noroute++; 585 in6_ifstat_inc(ifp, ifs6_out_discard); 586 error = EHOSTUNREACH; 587 goto bad; 588 } 589 } 590 591 if (opt && opt->ip6po_hlim != -1) 592 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 593 } else { 594 /* Multicast */ 595 struct in6_multi *in6m; 596 597 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 598 599 /* 600 * See if the caller provided any multicast options 601 */ 602 ifp = NULL; 603 if (im6o != NULL) { 604 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 605 if (im6o->im6o_multicast_ifp != NULL) 606 ifp = im6o->im6o_multicast_ifp; 607 } else 608 ip6->ip6_hlim = ip6_defmcasthlim; 609 610 /* 611 * See if the caller provided the outgoing interface 612 * as an ancillary data. 613 * Boundary check for ifindex is assumed to be already done. 614 */ 615 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 616 ifp = ifnet_byindex(opt->ip6po_pktinfo->ipi6_ifindex); 617 618 /* 619 * If the destination is a node-local scope multicast, 620 * the packet should be loop-backed only. 621 */ 622 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 623 /* 624 * If the outgoing interface is already specified, 625 * it should be a loopback interface. 626 */ 627 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 628 ip6stat.ip6s_badscope++; 629 error = ENETUNREACH; /* XXX: better error? */ 630 /* XXX correct ifp? */ 631 in6_ifstat_inc(ifp, ifs6_out_discard); 632 goto bad; 633 } else { 634 ifp = &loif[0]; 635 } 636 } 637 638 if (opt && opt->ip6po_hlim != -1) 639 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 640 641 /* 642 * If caller did not provide an interface lookup a 643 * default in the routing table. This is either a 644 * default for the speicfied group (i.e. a host 645 * route), or a multicast default (a route for the 646 * ``net'' ff00::/8). 647 */ 648 if (ifp == NULL) { 649 if (ro->ro_rt == 0) { 650 ro->ro_rt = rtalloc1((struct sockaddr *) 651 &ro->ro_dst, 0, 0UL); 652 } 653 if (ro->ro_rt == 0) { 654 ip6stat.ip6s_noroute++; 655 error = EHOSTUNREACH; 656 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 657 goto bad; 658 } 659 ia = ifatoia6(ro->ro_rt->rt_ifa); 660 ifp = ro->ro_rt->rt_ifp; 661 ro->ro_rt->rt_use++; 662 } 663 664 if ((flags & IPV6_FORWARDING) == 0) 665 in6_ifstat_inc(ifp, ifs6_out_request); 666 in6_ifstat_inc(ifp, ifs6_out_mcast); 667 668 /* 669 * Confirm that the outgoing interface supports multicast. 670 */ 671 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 672 ip6stat.ip6s_noroute++; 673 in6_ifstat_inc(ifp, ifs6_out_discard); 674 error = ENETUNREACH; 675 goto bad; 676 } 677 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 678 if (in6m != NULL && 679 (im6o == NULL || im6o->im6o_multicast_loop)) { 680 /* 681 * If we belong to the destination multicast group 682 * on the outgoing interface, and the caller did not 683 * forbid loopback, loop back a copy. 684 */ 685 ip6_mloopback(ifp, m, dst); 686 } else { 687 /* 688 * If we are acting as a multicast router, perform 689 * multicast forwarding as if the packet had just 690 * arrived on the interface to which we are about 691 * to send. The multicast forwarding function 692 * recursively calls this function, using the 693 * IPV6_FORWARDING flag to prevent infinite recursion. 694 * 695 * Multicasts that are looped back by ip6_mloopback(), 696 * above, will be forwarded by the ip6_input() routine, 697 * if necessary. 698 */ 699 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 700 if (ip6_mforward(ip6, ifp, m) != 0) { 701 m_freem(m); 702 goto done; 703 } 704 } 705 } 706 /* 707 * Multicasts with a hoplimit of zero may be looped back, 708 * above, but must not be transmitted on a network. 709 * Also, multicasts addressed to the loopback interface 710 * are not sent -- the above call to ip6_mloopback() will 711 * loop back a copy if this host actually belongs to the 712 * destination group on the loopback interface. 713 */ 714 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 715 m_freem(m); 716 goto done; 717 } 718 } 719 720 /* 721 * Fill the outgoing inteface to tell the upper layer 722 * to increment per-interface statistics. 723 */ 724 if (ifpp) 725 *ifpp = ifp; 726 727 /* 728 * Determine path MTU. 729 */ 730 if (ro_pmtu != ro) { 731 /* The first hop and the final destination may differ. */ 732 struct sockaddr_in6 *sin6_fin = 733 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 734 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 735 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 736 &finaldst))) { 737 RTFREE(ro_pmtu->ro_rt); 738 ro_pmtu->ro_rt = (struct rtentry *)0; 739 } 740 if (ro_pmtu->ro_rt == 0) { 741 bzero(sin6_fin, sizeof(*sin6_fin)); 742 sin6_fin->sin6_family = AF_INET6; 743 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 744 sin6_fin->sin6_addr = finaldst; 745 746 rtalloc((struct route *)ro_pmtu); 747 } 748 } 749 if (ro_pmtu->ro_rt != NULL) { 750 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 751 752 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 753 if (mtu > ifmtu || mtu == 0) { 754 /* 755 * The MTU on the route is larger than the MTU on 756 * the interface! This shouldn't happen, unless the 757 * MTU of the interface has been changed after the 758 * interface was brought up. Change the MTU in the 759 * route to match the interface MTU (as long as the 760 * field isn't locked). 761 * 762 * if MTU on the route is 0, we need to fix the MTU. 763 * this case happens with path MTU discovery timeouts. 764 */ 765 mtu = ifmtu; 766 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 767 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 768 } 769 } else { 770 mtu = nd_ifinfo[ifp->if_index].linkmtu; 771 } 772 773 /* 774 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 775 */ 776 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 777 mtu = IPV6_MMTU; 778 779 /* Fake scoped addresses */ 780 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 781 /* 782 * If source or destination address is a scoped address, and 783 * the packet is going to be sent to a loopback interface, 784 * we should keep the original interface. 785 */ 786 787 /* 788 * XXX: this is a very experimental and temporary solution. 789 * We eventually have sockaddr_in6 and use the sin6_scope_id 790 * field of the structure here. 791 * We rely on the consistency between two scope zone ids 792 * of source and destination, which should already be assured. 793 * Larger scopes than link will be supported in the future. 794 */ 795 origifp = NULL; 796 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 797 origifp = ifnet_byindex(ntohs(ip6->ip6_src.s6_addr16[1])); 798 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 799 origifp = ifnet_byindex(ntohs(ip6->ip6_dst.s6_addr16[1])); 800 /* 801 * XXX: origifp can be NULL even in those two cases above. 802 * For example, if we remove the (only) link-local address 803 * from the loopback interface, and try to send a link-local 804 * address without link-id information. Then the source 805 * address is ::1, and the destination address is the 806 * link-local address with its s6_addr16[1] being zero. 807 * What is worse, if the packet goes to the loopback interface 808 * by a default rejected route, the null pointer would be 809 * passed to looutput, and the kernel would hang. 810 * The following last resort would prevent such disaster. 811 */ 812 if (origifp == NULL) 813 origifp = ifp; 814 } 815 else 816 origifp = ifp; 817#ifndef SCOPEDROUTING 818 /* 819 * clear embedded scope identifiers if necessary. 820 * in6_clearscope will touch the addresses only when necessary. 821 */ 822 in6_clearscope(&ip6->ip6_src); 823 in6_clearscope(&ip6->ip6_dst); 824#endif 825 826 /* 827 * Check with the firewall... 828 */ 829 if (ip6_fw_enable && ip6_fw_chk_ptr) { 830 u_short port = 0; 831 m->m_pkthdr.rcvif = NULL; /* XXX */ 832 /* If ipfw says divert, we have to just drop packet */ 833 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 834 m_freem(m); 835 goto done; 836 } 837 if (!m) { 838 error = EACCES; 839 goto done; 840 } 841 } 842 843 /* 844 * If the outgoing packet contains a hop-by-hop options header, 845 * it must be examined and processed even by the source node. 846 * (RFC 2460, section 4.) 847 */ 848 if (exthdrs.ip6e_hbh) { 849 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 850 u_int32_t dummy1; /* XXX unused */ 851 u_int32_t dummy2; /* XXX unused */ 852 853#ifdef DIAGNOSTIC 854 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 855 panic("ip6e_hbh is not continuous"); 856#endif 857 /* 858 * XXX: if we have to send an ICMPv6 error to the sender, 859 * we need the M_LOOP flag since icmp6_error() expects 860 * the IPv6 and the hop-by-hop options header are 861 * continuous unless the flag is set. 862 */ 863 m->m_flags |= M_LOOP; 864 m->m_pkthdr.rcvif = ifp; 865 if (ip6_process_hopopts(m, 866 (u_int8_t *)(hbh + 1), 867 ((hbh->ip6h_len + 1) << 3) - 868 sizeof(struct ip6_hbh), 869 &dummy1, &dummy2) < 0) { 870 /* m was already freed at this point */ 871 error = EINVAL;/* better error? */ 872 goto done; 873 } 874 m->m_flags &= ~M_LOOP; /* XXX */ 875 m->m_pkthdr.rcvif = NULL; 876 } 877 878#ifdef PFIL_HOOKS 879 /* 880 * Run through list of hooks for output packets. 881 */ 882 m1 = m; 883 pfh = pfil_hook_get(PFIL_OUT, &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 884 for (; pfh; pfh = pfh->pfil_link.tqe_next) 885 if (pfh->pfil_func) { 886 rv = pfh->pfil_func(ip6, sizeof(*ip6), ifp, 1, &m1); 887 if (rv) { 888 error = EHOSTUNREACH; 889 goto done; 890 } 891 m = m1; 892 if (m == NULL) 893 goto done; 894 ip6 = mtod(m, struct ip6_hdr *); 895 } 896#endif /* PFIL_HOOKS */ 897 /* 898 * Send the packet to the outgoing interface. 899 * If necessary, do IPv6 fragmentation before sending. 900 */ 901 tlen = m->m_pkthdr.len; 902 if (tlen <= mtu 903#ifdef notyet 904 /* 905 * On any link that cannot convey a 1280-octet packet in one piece, 906 * link-specific fragmentation and reassembly must be provided at 907 * a layer below IPv6. [RFC 2460, sec.5] 908 * Thus if the interface has ability of link-level fragmentation, 909 * we can just send the packet even if the packet size is 910 * larger than the link's MTU. 911 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 912 */ 913 914 || ifp->if_flags & IFF_FRAGMENTABLE 915#endif 916 ) 917 { 918 /* Record statistics for this interface address. */ 919 if (ia && !(flags & IPV6_FORWARDING)) { 920 ia->ia_ifa.if_opackets++; 921 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 922 } 923#ifdef IPSEC 924 /* clean ipsec history once it goes out of the node */ 925 ipsec_delaux(m); 926#endif 927 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 928 goto done; 929 } else if (mtu < IPV6_MMTU) { 930 /* 931 * note that path MTU is never less than IPV6_MMTU 932 * (see icmp6_input). 933 */ 934 error = EMSGSIZE; 935 in6_ifstat_inc(ifp, ifs6_out_fragfail); 936 goto bad; 937 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 938 error = EMSGSIZE; 939 in6_ifstat_inc(ifp, ifs6_out_fragfail); 940 goto bad; 941 } else { 942 struct mbuf **mnext, *m_frgpart; 943 struct ip6_frag *ip6f; 944 u_int32_t id = htonl(ip6_id++); 945 u_char nextproto; 946 947 /* 948 * Too large for the destination or interface; 949 * fragment if possible. 950 * Must be able to put at least 8 bytes per fragment. 951 */ 952 hlen = unfragpartlen; 953 if (mtu > IPV6_MAXPACKET) 954 mtu = IPV6_MAXPACKET; 955 956 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 957 if (len < 8) { 958 error = EMSGSIZE; 959 in6_ifstat_inc(ifp, ifs6_out_fragfail); 960 goto bad; 961 } 962 963 mnext = &m->m_nextpkt; 964 965 /* 966 * Change the next header field of the last header in the 967 * unfragmentable part. 968 */ 969 if (exthdrs.ip6e_rthdr) { 970 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 971 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 972 } else if (exthdrs.ip6e_dest1) { 973 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 974 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 975 } else if (exthdrs.ip6e_hbh) { 976 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 977 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 978 } else { 979 nextproto = ip6->ip6_nxt; 980 ip6->ip6_nxt = IPPROTO_FRAGMENT; 981 } 982 983 /* 984 * Loop through length of segment after first fragment, 985 * make new header and copy data of each part and link onto 986 * chain. 987 */ 988 m0 = m; 989 for (off = hlen; off < tlen; off += len) { 990 MGETHDR(m, M_DONTWAIT, MT_HEADER); 991 if (!m) { 992 error = ENOBUFS; 993 ip6stat.ip6s_odropped++; 994 goto sendorfree; 995 } 996 m->m_pkthdr.rcvif = NULL; 997 m->m_flags = m0->m_flags & M_COPYFLAGS; 998 *mnext = m; 999 mnext = &m->m_nextpkt; 1000 m->m_data += max_linkhdr; 1001 mhip6 = mtod(m, struct ip6_hdr *); 1002 *mhip6 = *ip6; 1003 m->m_len = sizeof(*mhip6); 1004 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1005 if (error) { 1006 ip6stat.ip6s_odropped++; 1007 goto sendorfree; 1008 } 1009 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1010 if (off + len >= tlen) 1011 len = tlen - off; 1012 else 1013 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1014 mhip6->ip6_plen = htons((u_short)(len + hlen + 1015 sizeof(*ip6f) - 1016 sizeof(struct ip6_hdr))); 1017 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1018 error = ENOBUFS; 1019 ip6stat.ip6s_odropped++; 1020 goto sendorfree; 1021 } 1022 m_cat(m, m_frgpart); 1023 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1024 m->m_pkthdr.rcvif = (struct ifnet *)0; 1025 ip6f->ip6f_reserved = 0; 1026 ip6f->ip6f_ident = id; 1027 ip6f->ip6f_nxt = nextproto; 1028 ip6stat.ip6s_ofragments++; 1029 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1030 } 1031 1032 in6_ifstat_inc(ifp, ifs6_out_fragok); 1033 } 1034 1035 /* 1036 * Remove leading garbages. 1037 */ 1038sendorfree: 1039 m = m0->m_nextpkt; 1040 m0->m_nextpkt = 0; 1041 m_freem(m0); 1042 for (m0 = m; m; m = m0) { 1043 m0 = m->m_nextpkt; 1044 m->m_nextpkt = 0; 1045 if (error == 0) { 1046 /* Record statistics for this interface address. */ 1047 if (ia) { 1048 ia->ia_ifa.if_opackets++; 1049 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1050 } 1051#ifdef IPSEC 1052 /* clean ipsec history once it goes out of the node */ 1053 ipsec_delaux(m); 1054#endif 1055 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1056 } else 1057 m_freem(m); 1058 } 1059 1060 if (error == 0) 1061 ip6stat.ip6s_fragmented++; 1062 1063done: 1064 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1065 RTFREE(ro->ro_rt); 1066 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1067 RTFREE(ro_pmtu->ro_rt); 1068 } 1069 1070#ifdef IPSEC 1071 if (sp != NULL) 1072 key_freesp(sp); 1073#endif /* IPSEC */ 1074 1075 return(error); 1076 1077freehdrs: 1078 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1079 m_freem(exthdrs.ip6e_dest1); 1080 m_freem(exthdrs.ip6e_rthdr); 1081 m_freem(exthdrs.ip6e_dest2); 1082 /* fall through */ 1083bad: 1084 m_freem(m); 1085 goto done; 1086} 1087 1088static int 1089ip6_copyexthdr(mp, hdr, hlen) 1090 struct mbuf **mp; 1091 caddr_t hdr; 1092 int hlen; 1093{ 1094 struct mbuf *m; 1095 1096 if (hlen > MCLBYTES) 1097 return(ENOBUFS); /* XXX */ 1098 1099 MGET(m, M_DONTWAIT, MT_DATA); 1100 if (!m) 1101 return(ENOBUFS); 1102 1103 if (hlen > MLEN) { 1104 MCLGET(m, M_DONTWAIT); 1105 if ((m->m_flags & M_EXT) == 0) { 1106 m_free(m); 1107 return(ENOBUFS); 1108 } 1109 } 1110 m->m_len = hlen; 1111 if (hdr) 1112 bcopy(hdr, mtod(m, caddr_t), hlen); 1113 1114 *mp = m; 1115 return(0); 1116} 1117 1118/* 1119 * Insert jumbo payload option. 1120 */ 1121static int 1122ip6_insert_jumboopt(exthdrs, plen) 1123 struct ip6_exthdrs *exthdrs; 1124 u_int32_t plen; 1125{ 1126 struct mbuf *mopt; 1127 u_char *optbuf; 1128 u_int32_t v; 1129 1130#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1131 1132 /* 1133 * If there is no hop-by-hop options header, allocate new one. 1134 * If there is one but it doesn't have enough space to store the 1135 * jumbo payload option, allocate a cluster to store the whole options. 1136 * Otherwise, use it to store the options. 1137 */ 1138 if (exthdrs->ip6e_hbh == 0) { 1139 MGET(mopt, M_DONTWAIT, MT_DATA); 1140 if (mopt == 0) 1141 return(ENOBUFS); 1142 mopt->m_len = JUMBOOPTLEN; 1143 optbuf = mtod(mopt, u_char *); 1144 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1145 exthdrs->ip6e_hbh = mopt; 1146 } else { 1147 struct ip6_hbh *hbh; 1148 1149 mopt = exthdrs->ip6e_hbh; 1150 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1151 /* 1152 * XXX assumption: 1153 * - exthdrs->ip6e_hbh is not referenced from places 1154 * other than exthdrs. 1155 * - exthdrs->ip6e_hbh is not an mbuf chain. 1156 */ 1157 int oldoptlen = mopt->m_len; 1158 struct mbuf *n; 1159 1160 /* 1161 * XXX: give up if the whole (new) hbh header does 1162 * not fit even in an mbuf cluster. 1163 */ 1164 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1165 return(ENOBUFS); 1166 1167 /* 1168 * As a consequence, we must always prepare a cluster 1169 * at this point. 1170 */ 1171 MGET(n, M_DONTWAIT, MT_DATA); 1172 if (n) { 1173 MCLGET(n, M_DONTWAIT); 1174 if ((n->m_flags & M_EXT) == 0) { 1175 m_freem(n); 1176 n = NULL; 1177 } 1178 } 1179 if (!n) 1180 return(ENOBUFS); 1181 n->m_len = oldoptlen + JUMBOOPTLEN; 1182 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1183 oldoptlen); 1184 optbuf = mtod(n, caddr_t) + oldoptlen; 1185 m_freem(mopt); 1186 mopt = exthdrs->ip6e_hbh = n; 1187 } else { 1188 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1189 mopt->m_len += JUMBOOPTLEN; 1190 } 1191 optbuf[0] = IP6OPT_PADN; 1192 optbuf[1] = 1; 1193 1194 /* 1195 * Adjust the header length according to the pad and 1196 * the jumbo payload option. 1197 */ 1198 hbh = mtod(mopt, struct ip6_hbh *); 1199 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1200 } 1201 1202 /* fill in the option. */ 1203 optbuf[2] = IP6OPT_JUMBO; 1204 optbuf[3] = 4; 1205 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1206 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1207 1208 /* finally, adjust the packet header length */ 1209 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1210 1211 return(0); 1212#undef JUMBOOPTLEN 1213} 1214 1215/* 1216 * Insert fragment header and copy unfragmentable header portions. 1217 */ 1218static int 1219ip6_insertfraghdr(m0, m, hlen, frghdrp) 1220 struct mbuf *m0, *m; 1221 int hlen; 1222 struct ip6_frag **frghdrp; 1223{ 1224 struct mbuf *n, *mlast; 1225 1226 if (hlen > sizeof(struct ip6_hdr)) { 1227 n = m_copym(m0, sizeof(struct ip6_hdr), 1228 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1229 if (n == 0) 1230 return(ENOBUFS); 1231 m->m_next = n; 1232 } else 1233 n = m; 1234 1235 /* Search for the last mbuf of unfragmentable part. */ 1236 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1237 ; 1238 1239 if ((mlast->m_flags & M_EXT) == 0 && 1240 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1241 /* use the trailing space of the last mbuf for the fragment hdr */ 1242 *frghdrp = 1243 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1244 mlast->m_len += sizeof(struct ip6_frag); 1245 m->m_pkthdr.len += sizeof(struct ip6_frag); 1246 } else { 1247 /* allocate a new mbuf for the fragment header */ 1248 struct mbuf *mfrg; 1249 1250 MGET(mfrg, M_DONTWAIT, MT_DATA); 1251 if (mfrg == 0) 1252 return(ENOBUFS); 1253 mfrg->m_len = sizeof(struct ip6_frag); 1254 *frghdrp = mtod(mfrg, struct ip6_frag *); 1255 mlast->m_next = mfrg; 1256 } 1257 1258 return(0); 1259} 1260 1261/* 1262 * IP6 socket option processing. 1263 */ 1264int 1265ip6_ctloutput(so, sopt) 1266 struct socket *so; 1267 struct sockopt *sopt; 1268{ 1269 int privileged; 1270 struct inpcb *in6p = sotoinpcb(so); 1271 int error, optval; 1272 int level, op, optname; 1273 int optlen; 1274 struct thread *td; 1275 1276 if (sopt) { 1277 level = sopt->sopt_level; 1278 op = sopt->sopt_dir; 1279 optname = sopt->sopt_name; 1280 optlen = sopt->sopt_valsize; 1281 td = sopt->sopt_td; 1282 } else { 1283 panic("ip6_ctloutput: arg soopt is NULL"); 1284 } 1285 error = optval = 0; 1286 1287 privileged = (td == 0 || suser(td)) ? 0 : 1; 1288 1289 if (level == IPPROTO_IPV6) { 1290 switch (op) { 1291 1292 case SOPT_SET: 1293 switch (optname) { 1294 case IPV6_PKTOPTIONS: 1295 { 1296 struct mbuf *m; 1297 1298 error = soopt_getm(sopt, &m); /* XXX */ 1299 if (error != NULL) 1300 break; 1301 error = soopt_mcopyin(sopt, m); /* XXX */ 1302 if (error != NULL) 1303 break; 1304 error = ip6_pcbopts(&in6p->in6p_outputopts, 1305 m, so, sopt); 1306 m_freem(m); /* XXX */ 1307 break; 1308 } 1309 1310 /* 1311 * Use of some Hop-by-Hop options or some 1312 * Destination options, might require special 1313 * privilege. That is, normal applications 1314 * (without special privilege) might be forbidden 1315 * from setting certain options in outgoing packets, 1316 * and might never see certain options in received 1317 * packets. [RFC 2292 Section 6] 1318 * KAME specific note: 1319 * KAME prevents non-privileged users from sending or 1320 * receiving ANY hbh/dst options in order to avoid 1321 * overhead of parsing options in the kernel. 1322 */ 1323 case IPV6_UNICAST_HOPS: 1324 case IPV6_CHECKSUM: 1325 case IPV6_FAITH: 1326 1327 case IPV6_V6ONLY: 1328 if (optlen != sizeof(int)) { 1329 error = EINVAL; 1330 break; 1331 } 1332 error = sooptcopyin(sopt, &optval, 1333 sizeof optval, sizeof optval); 1334 if (error) 1335 break; 1336 switch (optname) { 1337 1338 case IPV6_UNICAST_HOPS: 1339 if (optval < -1 || optval >= 256) 1340 error = EINVAL; 1341 else { 1342 /* -1 = kernel default */ 1343 in6p->in6p_hops = optval; 1344 1345 if ((in6p->in6p_vflag & 1346 INP_IPV4) != 0) 1347 in6p->inp_ip_ttl = optval; 1348 } 1349 break; 1350#define OPTSET(bit) \ 1351do { \ 1352 if (optval) \ 1353 in6p->in6p_flags |= (bit); \ 1354 else \ 1355 in6p->in6p_flags &= ~(bit); \ 1356} while (0) 1357#define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1358 1359 case IPV6_CHECKSUM: 1360 in6p->in6p_cksum = optval; 1361 break; 1362 1363 case IPV6_FAITH: 1364 OPTSET(IN6P_FAITH); 1365 break; 1366 1367 case IPV6_V6ONLY: 1368 /* 1369 * make setsockopt(IPV6_V6ONLY) 1370 * available only prior to bind(2). 1371 * see ipng mailing list, Jun 22 2001. 1372 */ 1373 if (in6p->in6p_lport || 1374 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1375 { 1376 error = EINVAL; 1377 break; 1378 } 1379 OPTSET(IN6P_IPV6_V6ONLY); 1380 break; 1381 } 1382 break; 1383 1384 case IPV6_PKTINFO: 1385 case IPV6_HOPLIMIT: 1386 case IPV6_HOPOPTS: 1387 case IPV6_DSTOPTS: 1388 case IPV6_RTHDR: 1389 /* RFC 2292 */ 1390 if (optlen != sizeof(int)) { 1391 error = EINVAL; 1392 break; 1393 } 1394 error = sooptcopyin(sopt, &optval, 1395 sizeof optval, sizeof optval); 1396 if (error) 1397 break; 1398 switch (optname) { 1399 case IPV6_PKTINFO: 1400 OPTSET(IN6P_PKTINFO); 1401 break; 1402 case IPV6_HOPLIMIT: 1403 OPTSET(IN6P_HOPLIMIT); 1404 break; 1405 case IPV6_HOPOPTS: 1406 /* 1407 * Check super-user privilege. 1408 * See comments for IPV6_RECVHOPOPTS. 1409 */ 1410 if (!privileged) 1411 return(EPERM); 1412 OPTSET(IN6P_HOPOPTS); 1413 break; 1414 case IPV6_DSTOPTS: 1415 if (!privileged) 1416 return(EPERM); 1417 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1418 break; 1419 case IPV6_RTHDR: 1420 OPTSET(IN6P_RTHDR); 1421 break; 1422 } 1423 break; 1424#undef OPTSET 1425 1426 case IPV6_MULTICAST_IF: 1427 case IPV6_MULTICAST_HOPS: 1428 case IPV6_MULTICAST_LOOP: 1429 case IPV6_JOIN_GROUP: 1430 case IPV6_LEAVE_GROUP: 1431 { 1432 struct mbuf *m; 1433 if (sopt->sopt_valsize > MLEN) { 1434 error = EMSGSIZE; 1435 break; 1436 } 1437 /* XXX */ 1438 MGET(m, sopt->sopt_td ? M_TRYWAIT : M_DONTWAIT, MT_HEADER); 1439 if (m == 0) { 1440 error = ENOBUFS; 1441 break; 1442 } 1443 m->m_len = sopt->sopt_valsize; 1444 error = sooptcopyin(sopt, mtod(m, char *), 1445 m->m_len, m->m_len); 1446 error = ip6_setmoptions(sopt->sopt_name, 1447 &in6p->in6p_moptions, 1448 m); 1449 (void)m_free(m); 1450 } 1451 break; 1452 1453 case IPV6_PORTRANGE: 1454 error = sooptcopyin(sopt, &optval, 1455 sizeof optval, sizeof optval); 1456 if (error) 1457 break; 1458 1459 switch (optval) { 1460 case IPV6_PORTRANGE_DEFAULT: 1461 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1462 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1463 break; 1464 1465 case IPV6_PORTRANGE_HIGH: 1466 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1467 in6p->in6p_flags |= IN6P_HIGHPORT; 1468 break; 1469 1470 case IPV6_PORTRANGE_LOW: 1471 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1472 in6p->in6p_flags |= IN6P_LOWPORT; 1473 break; 1474 1475 default: 1476 error = EINVAL; 1477 break; 1478 } 1479 break; 1480 1481#ifdef IPSEC 1482 case IPV6_IPSEC_POLICY: 1483 { 1484 caddr_t req = NULL; 1485 size_t len = 0; 1486 struct mbuf *m; 1487 1488 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1489 break; 1490 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1491 break; 1492 if (m) { 1493 req = mtod(m, caddr_t); 1494 len = m->m_len; 1495 } 1496 error = ipsec6_set_policy(in6p, optname, req, 1497 len, privileged); 1498 m_freem(m); 1499 } 1500 break; 1501#endif /* KAME IPSEC */ 1502 1503 case IPV6_FW_ADD: 1504 case IPV6_FW_DEL: 1505 case IPV6_FW_FLUSH: 1506 case IPV6_FW_ZERO: 1507 { 1508 struct mbuf *m; 1509 struct mbuf **mp = &m; 1510 1511 if (ip6_fw_ctl_ptr == NULL) 1512 return EINVAL; 1513 /* XXX */ 1514 if ((error = soopt_getm(sopt, &m)) != 0) 1515 break; 1516 /* XXX */ 1517 if ((error = soopt_mcopyin(sopt, m)) != 0) 1518 break; 1519 error = (*ip6_fw_ctl_ptr)(optname, mp); 1520 m = *mp; 1521 } 1522 break; 1523 1524 default: 1525 error = ENOPROTOOPT; 1526 break; 1527 } 1528 break; 1529 1530 case SOPT_GET: 1531 switch (optname) { 1532 1533 case IPV6_PKTOPTIONS: 1534 if (in6p->in6p_options) { 1535 struct mbuf *m; 1536 m = m_copym(in6p->in6p_options, 1537 0, M_COPYALL, M_TRYWAIT); 1538 error = soopt_mcopyout(sopt, m); 1539 if (error == 0) 1540 m_freem(m); 1541 } else 1542 sopt->sopt_valsize = 0; 1543 break; 1544 1545 case IPV6_UNICAST_HOPS: 1546 case IPV6_CHECKSUM: 1547 1548 case IPV6_FAITH: 1549 case IPV6_V6ONLY: 1550 case IPV6_PORTRANGE: 1551 switch (optname) { 1552 1553 case IPV6_UNICAST_HOPS: 1554 optval = in6p->in6p_hops; 1555 break; 1556 1557 case IPV6_CHECKSUM: 1558 optval = in6p->in6p_cksum; 1559 break; 1560 1561 case IPV6_FAITH: 1562 optval = OPTBIT(IN6P_FAITH); 1563 break; 1564 1565 case IPV6_V6ONLY: 1566 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1567 break; 1568 1569 case IPV6_PORTRANGE: 1570 { 1571 int flags; 1572 flags = in6p->in6p_flags; 1573 if (flags & IN6P_HIGHPORT) 1574 optval = IPV6_PORTRANGE_HIGH; 1575 else if (flags & IN6P_LOWPORT) 1576 optval = IPV6_PORTRANGE_LOW; 1577 else 1578 optval = 0; 1579 break; 1580 } 1581 } 1582 error = sooptcopyout(sopt, &optval, 1583 sizeof optval); 1584 break; 1585 1586 case IPV6_PKTINFO: 1587 case IPV6_HOPLIMIT: 1588 case IPV6_HOPOPTS: 1589 case IPV6_RTHDR: 1590 case IPV6_DSTOPTS: 1591 if (optname == IPV6_HOPOPTS || 1592 optname == IPV6_DSTOPTS || 1593 !privileged) 1594 return(EPERM); 1595 switch (optname) { 1596 case IPV6_PKTINFO: 1597 optval = OPTBIT(IN6P_PKTINFO); 1598 break; 1599 case IPV6_HOPLIMIT: 1600 optval = OPTBIT(IN6P_HOPLIMIT); 1601 break; 1602 case IPV6_HOPOPTS: 1603 if (!privileged) 1604 return(EPERM); 1605 optval = OPTBIT(IN6P_HOPOPTS); 1606 break; 1607 case IPV6_RTHDR: 1608 optval = OPTBIT(IN6P_RTHDR); 1609 break; 1610 case IPV6_DSTOPTS: 1611 if (!privileged) 1612 return(EPERM); 1613 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1614 break; 1615 } 1616 error = sooptcopyout(sopt, &optval, 1617 sizeof optval); 1618 break; 1619 1620 case IPV6_MULTICAST_IF: 1621 case IPV6_MULTICAST_HOPS: 1622 case IPV6_MULTICAST_LOOP: 1623 case IPV6_JOIN_GROUP: 1624 case IPV6_LEAVE_GROUP: 1625 { 1626 struct mbuf *m; 1627 error = ip6_getmoptions(sopt->sopt_name, 1628 in6p->in6p_moptions, &m); 1629 if (error == 0) 1630 error = sooptcopyout(sopt, 1631 mtod(m, char *), m->m_len); 1632 m_freem(m); 1633 } 1634 break; 1635 1636#ifdef IPSEC 1637 case IPV6_IPSEC_POLICY: 1638 { 1639 caddr_t req = NULL; 1640 size_t len = 0; 1641 struct mbuf *m = NULL; 1642 struct mbuf **mp = &m; 1643 1644 error = soopt_getm(sopt, &m); /* XXX */ 1645 if (error != NULL) 1646 break; 1647 error = soopt_mcopyin(sopt, m); /* XXX */ 1648 if (error != NULL) 1649 break; 1650 if (m) { 1651 req = mtod(m, caddr_t); 1652 len = m->m_len; 1653 } 1654 error = ipsec6_get_policy(in6p, req, len, mp); 1655 if (error == 0) 1656 error = soopt_mcopyout(sopt, m); /*XXX*/ 1657 if (error == 0 && m) 1658 m_freem(m); 1659 break; 1660 } 1661#endif /* KAME IPSEC */ 1662 1663 case IPV6_FW_GET: 1664 { 1665 struct mbuf *m; 1666 struct mbuf **mp = &m; 1667 1668 if (ip6_fw_ctl_ptr == NULL) 1669 { 1670 return EINVAL; 1671 } 1672 error = (*ip6_fw_ctl_ptr)(optname, mp); 1673 if (error == 0) 1674 error = soopt_mcopyout(sopt, m); /* XXX */ 1675 if (error == 0 && m) 1676 m_freem(m); 1677 } 1678 break; 1679 1680 default: 1681 error = ENOPROTOOPT; 1682 break; 1683 } 1684 break; 1685 } 1686 } else { 1687 error = EINVAL; 1688 } 1689 return(error); 1690} 1691 1692/* 1693 * Set up IP6 options in pcb for insertion in output packets or 1694 * specifying behavior of outgoing packets. 1695 */ 1696static int 1697ip6_pcbopts(pktopt, m, so, sopt) 1698 struct ip6_pktopts **pktopt; 1699 struct mbuf *m; 1700 struct socket *so; 1701 struct sockopt *sopt; 1702{ 1703 struct ip6_pktopts *opt = *pktopt; 1704 int error = 0; 1705 struct thread *td = sopt->sopt_td; 1706 int priv = 0; 1707 1708 /* turn off any old options. */ 1709 if (opt) { 1710#ifdef DIAGNOSTIC 1711 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1712 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1713 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1714 printf("ip6_pcbopts: all specified options are cleared.\n"); 1715#endif 1716 ip6_clearpktopts(opt, 1, -1); 1717 } else 1718 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1719 *pktopt = NULL; 1720 1721 if (!m || m->m_len == 0) { 1722 /* 1723 * Only turning off any previous options. 1724 */ 1725 if (opt) 1726 free(opt, M_IP6OPT); 1727 return(0); 1728 } 1729 1730 /* set options specified by user. */ 1731 if (td && !suser(td)) 1732 priv = 1; 1733 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1734 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1735 return(error); 1736 } 1737 *pktopt = opt; 1738 return(0); 1739} 1740 1741/* 1742 * initialize ip6_pktopts. beware that there are non-zero default values in 1743 * the struct. 1744 */ 1745void 1746init_ip6pktopts(opt) 1747 struct ip6_pktopts *opt; 1748{ 1749 1750 bzero(opt, sizeof(*opt)); 1751 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1752} 1753 1754void 1755ip6_clearpktopts(pktopt, needfree, optname) 1756 struct ip6_pktopts *pktopt; 1757 int needfree, optname; 1758{ 1759 if (pktopt == NULL) 1760 return; 1761 1762 if (optname == -1) { 1763 if (needfree && pktopt->ip6po_pktinfo) 1764 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1765 pktopt->ip6po_pktinfo = NULL; 1766 } 1767 if (optname == -1) 1768 pktopt->ip6po_hlim = -1; 1769 if (optname == -1) { 1770 if (needfree && pktopt->ip6po_nexthop) 1771 free(pktopt->ip6po_nexthop, M_IP6OPT); 1772 pktopt->ip6po_nexthop = NULL; 1773 } 1774 if (optname == -1) { 1775 if (needfree && pktopt->ip6po_hbh) 1776 free(pktopt->ip6po_hbh, M_IP6OPT); 1777 pktopt->ip6po_hbh = NULL; 1778 } 1779 if (optname == -1) { 1780 if (needfree && pktopt->ip6po_dest1) 1781 free(pktopt->ip6po_dest1, M_IP6OPT); 1782 pktopt->ip6po_dest1 = NULL; 1783 } 1784 if (optname == -1) { 1785 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1786 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1787 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1788 if (pktopt->ip6po_route.ro_rt) { 1789 RTFREE(pktopt->ip6po_route.ro_rt); 1790 pktopt->ip6po_route.ro_rt = NULL; 1791 } 1792 } 1793 if (optname == -1) { 1794 if (needfree && pktopt->ip6po_dest2) 1795 free(pktopt->ip6po_dest2, M_IP6OPT); 1796 pktopt->ip6po_dest2 = NULL; 1797 } 1798} 1799 1800#define PKTOPT_EXTHDRCPY(type) \ 1801do {\ 1802 if (src->type) {\ 1803 int hlen =\ 1804 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1805 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1806 if (dst->type == NULL && canwait == M_NOWAIT)\ 1807 goto bad;\ 1808 bcopy(src->type, dst->type, hlen);\ 1809 }\ 1810} while (0) 1811 1812struct ip6_pktopts * 1813ip6_copypktopts(src, canwait) 1814 struct ip6_pktopts *src; 1815 int canwait; 1816{ 1817 struct ip6_pktopts *dst; 1818 1819 if (src == NULL) { 1820 printf("ip6_clearpktopts: invalid argument\n"); 1821 return(NULL); 1822 } 1823 1824 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1825 if (dst == NULL && canwait == M_NOWAIT) 1826 goto bad; 1827 bzero(dst, sizeof(*dst)); 1828 1829 dst->ip6po_hlim = src->ip6po_hlim; 1830 if (src->ip6po_pktinfo) { 1831 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1832 M_IP6OPT, canwait); 1833 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1834 goto bad; 1835 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1836 } 1837 if (src->ip6po_nexthop) { 1838 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1839 M_IP6OPT, canwait); 1840 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1841 goto bad; 1842 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1843 src->ip6po_nexthop->sa_len); 1844 } 1845 PKTOPT_EXTHDRCPY(ip6po_hbh); 1846 PKTOPT_EXTHDRCPY(ip6po_dest1); 1847 PKTOPT_EXTHDRCPY(ip6po_dest2); 1848 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1849 return(dst); 1850 1851 bad: 1852 printf("ip6_copypktopts: copy failed"); 1853 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1854 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1855 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1856 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1857 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1858 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1859 return(NULL); 1860} 1861#undef PKTOPT_EXTHDRCPY 1862 1863void 1864ip6_freepcbopts(pktopt) 1865 struct ip6_pktopts *pktopt; 1866{ 1867 if (pktopt == NULL) 1868 return; 1869 1870 ip6_clearpktopts(pktopt, 1, -1); 1871 1872 free(pktopt, M_IP6OPT); 1873} 1874 1875/* 1876 * Set the IP6 multicast options in response to user setsockopt(). 1877 */ 1878static int 1879ip6_setmoptions(optname, im6op, m) 1880 int optname; 1881 struct ip6_moptions **im6op; 1882 struct mbuf *m; 1883{ 1884 int error = 0; 1885 u_int loop, ifindex; 1886 struct ipv6_mreq *mreq; 1887 struct ifnet *ifp; 1888 struct ip6_moptions *im6o = *im6op; 1889 struct route_in6 ro; 1890 struct sockaddr_in6 *dst; 1891 struct in6_multi_mship *imm; 1892 struct thread *td = curthread; /* XXX */ 1893 1894 if (im6o == NULL) { 1895 /* 1896 * No multicast option buffer attached to the pcb; 1897 * allocate one and initialize to default values. 1898 */ 1899 im6o = (struct ip6_moptions *) 1900 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1901 1902 if (im6o == NULL) 1903 return(ENOBUFS); 1904 *im6op = im6o; 1905 im6o->im6o_multicast_ifp = NULL; 1906 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1907 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1908 LIST_INIT(&im6o->im6o_memberships); 1909 } 1910 1911 switch (optname) { 1912 1913 case IPV6_MULTICAST_IF: 1914 /* 1915 * Select the interface for outgoing multicast packets. 1916 */ 1917 if (m == NULL || m->m_len != sizeof(u_int)) { 1918 error = EINVAL; 1919 break; 1920 } 1921 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1922 if (ifindex < 0 || if_index < ifindex) { 1923 error = ENXIO; /* XXX EINVAL? */ 1924 break; 1925 } 1926 ifp = ifnet_byindex(ifindex); 1927 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1928 error = EADDRNOTAVAIL; 1929 break; 1930 } 1931 im6o->im6o_multicast_ifp = ifp; 1932 break; 1933 1934 case IPV6_MULTICAST_HOPS: 1935 { 1936 /* 1937 * Set the IP6 hoplimit for outgoing multicast packets. 1938 */ 1939 int optval; 1940 if (m == NULL || m->m_len != sizeof(int)) { 1941 error = EINVAL; 1942 break; 1943 } 1944 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1945 if (optval < -1 || optval >= 256) 1946 error = EINVAL; 1947 else if (optval == -1) 1948 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1949 else 1950 im6o->im6o_multicast_hlim = optval; 1951 break; 1952 } 1953 1954 case IPV6_MULTICAST_LOOP: 1955 /* 1956 * Set the loopback flag for outgoing multicast packets. 1957 * Must be zero or one. 1958 */ 1959 if (m == NULL || m->m_len != sizeof(u_int)) { 1960 error = EINVAL; 1961 break; 1962 } 1963 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1964 if (loop > 1) { 1965 error = EINVAL; 1966 break; 1967 } 1968 im6o->im6o_multicast_loop = loop; 1969 break; 1970 1971 case IPV6_JOIN_GROUP: 1972 /* 1973 * Add a multicast group membership. 1974 * Group must be a valid IP6 multicast address. 1975 */ 1976 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1977 error = EINVAL; 1978 break; 1979 } 1980 mreq = mtod(m, struct ipv6_mreq *); 1981 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1982 /* 1983 * We use the unspecified address to specify to accept 1984 * all multicast addresses. Only super user is allowed 1985 * to do this. 1986 */ 1987 if (suser(td)) 1988 { 1989 error = EACCES; 1990 break; 1991 } 1992 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1993 error = EINVAL; 1994 break; 1995 } 1996 1997 /* 1998 * If the interface is specified, validate it. 1999 */ 2000 if (mreq->ipv6mr_interface < 0 2001 || if_index < mreq->ipv6mr_interface) { 2002 error = ENXIO; /* XXX EINVAL? */ 2003 break; 2004 } 2005 /* 2006 * If no interface was explicitly specified, choose an 2007 * appropriate one according to the given multicast address. 2008 */ 2009 if (mreq->ipv6mr_interface == 0) { 2010 /* 2011 * If the multicast address is in node-local scope, 2012 * the interface should be a loopback interface. 2013 * Otherwise, look up the routing table for the 2014 * address, and choose the outgoing interface. 2015 * XXX: is it a good approach? 2016 */ 2017 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2018 ifp = &loif[0]; 2019 } else { 2020 ro.ro_rt = NULL; 2021 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2022 bzero(dst, sizeof(*dst)); 2023 dst->sin6_len = sizeof(struct sockaddr_in6); 2024 dst->sin6_family = AF_INET6; 2025 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2026 rtalloc((struct route *)&ro); 2027 if (ro.ro_rt == NULL) { 2028 error = EADDRNOTAVAIL; 2029 break; 2030 } 2031 ifp = ro.ro_rt->rt_ifp; 2032 rtfree(ro.ro_rt); 2033 } 2034 } else 2035 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2036 2037 /* 2038 * See if we found an interface, and confirm that it 2039 * supports multicast 2040 */ 2041 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2042 error = EADDRNOTAVAIL; 2043 break; 2044 } 2045 /* 2046 * Put interface index into the multicast address, 2047 * if the address has link-local scope. 2048 */ 2049 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2050 mreq->ipv6mr_multiaddr.s6_addr16[1] 2051 = htons(mreq->ipv6mr_interface); 2052 } 2053 /* 2054 * See if the membership already exists. 2055 */ 2056 for (imm = im6o->im6o_memberships.lh_first; 2057 imm != NULL; imm = imm->i6mm_chain.le_next) 2058 if (imm->i6mm_maddr->in6m_ifp == ifp && 2059 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2060 &mreq->ipv6mr_multiaddr)) 2061 break; 2062 if (imm != NULL) { 2063 error = EADDRINUSE; 2064 break; 2065 } 2066 /* 2067 * Everything looks good; add a new record to the multicast 2068 * address list for the given interface. 2069 */ 2070 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2071 if (imm == NULL) { 2072 error = ENOBUFS; 2073 break; 2074 } 2075 if ((imm->i6mm_maddr = 2076 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2077 free(imm, M_IPMADDR); 2078 break; 2079 } 2080 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2081 break; 2082 2083 case IPV6_LEAVE_GROUP: 2084 /* 2085 * Drop a multicast group membership. 2086 * Group must be a valid IP6 multicast address. 2087 */ 2088 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2089 error = EINVAL; 2090 break; 2091 } 2092 mreq = mtod(m, struct ipv6_mreq *); 2093 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2094 if (suser(td)) { 2095 error = EACCES; 2096 break; 2097 } 2098 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2099 error = EINVAL; 2100 break; 2101 } 2102 /* 2103 * If an interface address was specified, get a pointer 2104 * to its ifnet structure. 2105 */ 2106 if (mreq->ipv6mr_interface < 0 2107 || if_index < mreq->ipv6mr_interface) { 2108 error = ENXIO; /* XXX EINVAL? */ 2109 break; 2110 } 2111 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2112 /* 2113 * Put interface index into the multicast address, 2114 * if the address has link-local scope. 2115 */ 2116 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2117 mreq->ipv6mr_multiaddr.s6_addr16[1] 2118 = htons(mreq->ipv6mr_interface); 2119 } 2120 /* 2121 * Find the membership in the membership list. 2122 */ 2123 for (imm = im6o->im6o_memberships.lh_first; 2124 imm != NULL; imm = imm->i6mm_chain.le_next) { 2125 if ((ifp == NULL || 2126 imm->i6mm_maddr->in6m_ifp == ifp) && 2127 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2128 &mreq->ipv6mr_multiaddr)) 2129 break; 2130 } 2131 if (imm == NULL) { 2132 /* Unable to resolve interface */ 2133 error = EADDRNOTAVAIL; 2134 break; 2135 } 2136 /* 2137 * Give up the multicast address record to which the 2138 * membership points. 2139 */ 2140 LIST_REMOVE(imm, i6mm_chain); 2141 in6_delmulti(imm->i6mm_maddr); 2142 free(imm, M_IPMADDR); 2143 break; 2144 2145 default: 2146 error = EOPNOTSUPP; 2147 break; 2148 } 2149 2150 /* 2151 * If all options have default values, no need to keep the mbuf. 2152 */ 2153 if (im6o->im6o_multicast_ifp == NULL && 2154 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2155 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2156 im6o->im6o_memberships.lh_first == NULL) { 2157 free(*im6op, M_IPMOPTS); 2158 *im6op = NULL; 2159 } 2160 2161 return(error); 2162} 2163 2164/* 2165 * Return the IP6 multicast options in response to user getsockopt(). 2166 */ 2167static int 2168ip6_getmoptions(optname, im6o, mp) 2169 int optname; 2170 struct ip6_moptions *im6o; 2171 struct mbuf **mp; 2172{ 2173 u_int *hlim, *loop, *ifindex; 2174 2175 *mp = m_get(M_TRYWAIT, MT_HEADER); /* XXX */ 2176 2177 switch (optname) { 2178 2179 case IPV6_MULTICAST_IF: 2180 ifindex = mtod(*mp, u_int *); 2181 (*mp)->m_len = sizeof(u_int); 2182 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2183 *ifindex = 0; 2184 else 2185 *ifindex = im6o->im6o_multicast_ifp->if_index; 2186 return(0); 2187 2188 case IPV6_MULTICAST_HOPS: 2189 hlim = mtod(*mp, u_int *); 2190 (*mp)->m_len = sizeof(u_int); 2191 if (im6o == NULL) 2192 *hlim = ip6_defmcasthlim; 2193 else 2194 *hlim = im6o->im6o_multicast_hlim; 2195 return(0); 2196 2197 case IPV6_MULTICAST_LOOP: 2198 loop = mtod(*mp, u_int *); 2199 (*mp)->m_len = sizeof(u_int); 2200 if (im6o == NULL) 2201 *loop = ip6_defmcasthlim; 2202 else 2203 *loop = im6o->im6o_multicast_loop; 2204 return(0); 2205 2206 default: 2207 return(EOPNOTSUPP); 2208 } 2209} 2210 2211/* 2212 * Discard the IP6 multicast options. 2213 */ 2214void 2215ip6_freemoptions(im6o) 2216 struct ip6_moptions *im6o; 2217{ 2218 struct in6_multi_mship *imm; 2219 2220 if (im6o == NULL) 2221 return; 2222 2223 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2224 LIST_REMOVE(imm, i6mm_chain); 2225 if (imm->i6mm_maddr) 2226 in6_delmulti(imm->i6mm_maddr); 2227 free(imm, M_IPMADDR); 2228 } 2229 free(im6o, M_IPMOPTS); 2230} 2231 2232/* 2233 * Set IPv6 outgoing packet options based on advanced API. 2234 */ 2235int 2236ip6_setpktoptions(control, opt, priv, needcopy) 2237 struct mbuf *control; 2238 struct ip6_pktopts *opt; 2239 int priv, needcopy; 2240{ 2241 struct cmsghdr *cm = 0; 2242 2243 if (control == 0 || opt == 0) 2244 return(EINVAL); 2245 2246 init_ip6pktopts(opt); 2247 2248 /* 2249 * XXX: Currently, we assume all the optional information is stored 2250 * in a single mbuf. 2251 */ 2252 if (control->m_next) 2253 return(EINVAL); 2254 2255 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2256 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2257 cm = mtod(control, struct cmsghdr *); 2258 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2259 return(EINVAL); 2260 if (cm->cmsg_level != IPPROTO_IPV6) 2261 continue; 2262 2263 /* 2264 * XXX should check if RFC2292 API is mixed with 2292bis API 2265 */ 2266 switch (cm->cmsg_type) { 2267 case IPV6_PKTINFO: 2268 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2269 return(EINVAL); 2270 if (needcopy) { 2271 /* XXX: Is it really WAITOK? */ 2272 opt->ip6po_pktinfo = 2273 malloc(sizeof(struct in6_pktinfo), 2274 M_IP6OPT, M_WAITOK); 2275 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2276 sizeof(struct in6_pktinfo)); 2277 } else 2278 opt->ip6po_pktinfo = 2279 (struct in6_pktinfo *)CMSG_DATA(cm); 2280 if (opt->ip6po_pktinfo->ipi6_ifindex && 2281 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2282 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2283 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2284 2285 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2286 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2287 return(ENXIO); 2288 } 2289 2290 /* 2291 * Check if the requested source address is indeed a 2292 * unicast address assigned to the node, and can be 2293 * used as the packet's source address. 2294 */ 2295 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2296 struct in6_ifaddr *ia6; 2297 struct sockaddr_in6 sin6; 2298 2299 bzero(&sin6, sizeof(sin6)); 2300 sin6.sin6_len = sizeof(sin6); 2301 sin6.sin6_family = AF_INET6; 2302 sin6.sin6_addr = 2303 opt->ip6po_pktinfo->ipi6_addr; 2304 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2305 if (ia6 == NULL || 2306 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2307 IN6_IFF_NOTREADY)) != 0) 2308 return(EADDRNOTAVAIL); 2309 } 2310 break; 2311 2312 case IPV6_HOPLIMIT: 2313 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2314 return(EINVAL); 2315 2316 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2317 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2318 return(EINVAL); 2319 break; 2320 2321 case IPV6_NEXTHOP: 2322 if (!priv) 2323 return(EPERM); 2324 2325 if (cm->cmsg_len < sizeof(u_char) || 2326 /* check if cmsg_len is large enough for sa_len */ 2327 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2328 return(EINVAL); 2329 2330 if (needcopy) { 2331 opt->ip6po_nexthop = 2332 malloc(*CMSG_DATA(cm), 2333 M_IP6OPT, M_WAITOK); 2334 bcopy(CMSG_DATA(cm), 2335 opt->ip6po_nexthop, 2336 *CMSG_DATA(cm)); 2337 } else 2338 opt->ip6po_nexthop = 2339 (struct sockaddr *)CMSG_DATA(cm); 2340 break; 2341 2342 case IPV6_HOPOPTS: 2343 { 2344 struct ip6_hbh *hbh; 2345 int hbhlen; 2346 2347 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2348 return(EINVAL); 2349 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2350 hbhlen = (hbh->ip6h_len + 1) << 3; 2351 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2352 return(EINVAL); 2353 2354 if (needcopy) { 2355 opt->ip6po_hbh = 2356 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2357 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2358 } else 2359 opt->ip6po_hbh = hbh; 2360 break; 2361 } 2362 2363 case IPV6_DSTOPTS: 2364 { 2365 struct ip6_dest *dest, **newdest; 2366 int destlen; 2367 2368 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2369 return(EINVAL); 2370 dest = (struct ip6_dest *)CMSG_DATA(cm); 2371 destlen = (dest->ip6d_len + 1) << 3; 2372 if (cm->cmsg_len != CMSG_LEN(destlen)) 2373 return(EINVAL); 2374 2375 /* 2376 * The old advacned API is ambiguous on this 2377 * point. Our approach is to determine the 2378 * position based according to the existence 2379 * of a routing header. Note, however, that 2380 * this depends on the order of the extension 2381 * headers in the ancillary data; the 1st part 2382 * of the destination options header must 2383 * appear before the routing header in the 2384 * ancillary data, too. 2385 * RFC2292bis solved the ambiguity by 2386 * introducing separate cmsg types. 2387 */ 2388 if (opt->ip6po_rthdr == NULL) 2389 newdest = &opt->ip6po_dest1; 2390 else 2391 newdest = &opt->ip6po_dest2; 2392 2393 if (needcopy) { 2394 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2395 bcopy(dest, *newdest, destlen); 2396 } else 2397 *newdest = dest; 2398 2399 break; 2400 } 2401 2402 case IPV6_RTHDR: 2403 { 2404 struct ip6_rthdr *rth; 2405 int rthlen; 2406 2407 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2408 return(EINVAL); 2409 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2410 rthlen = (rth->ip6r_len + 1) << 3; 2411 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2412 return(EINVAL); 2413 2414 switch (rth->ip6r_type) { 2415 case IPV6_RTHDR_TYPE_0: 2416 /* must contain one addr */ 2417 if (rth->ip6r_len == 0) 2418 return(EINVAL); 2419 /* length must be even */ 2420 if (rth->ip6r_len % 2) 2421 return(EINVAL); 2422 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2423 return(EINVAL); 2424 break; 2425 default: 2426 return(EINVAL); /* not supported */ 2427 } 2428 2429 if (needcopy) { 2430 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2431 M_WAITOK); 2432 bcopy(rth, opt->ip6po_rthdr, rthlen); 2433 } else 2434 opt->ip6po_rthdr = rth; 2435 2436 break; 2437 } 2438 2439 default: 2440 return(ENOPROTOOPT); 2441 } 2442 } 2443 2444 return(0); 2445} 2446 2447/* 2448 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2449 * packet to the input queue of a specified interface. Note that this 2450 * calls the output routine of the loopback "driver", but with an interface 2451 * pointer that might NOT be &loif -- easier than replicating that code here. 2452 */ 2453void 2454ip6_mloopback(ifp, m, dst) 2455 struct ifnet *ifp; 2456 struct mbuf *m; 2457 struct sockaddr_in6 *dst; 2458{ 2459 struct mbuf *copym; 2460 struct ip6_hdr *ip6; 2461 2462 copym = m_copy(m, 0, M_COPYALL); 2463 if (copym == NULL) 2464 return; 2465 2466 /* 2467 * Make sure to deep-copy IPv6 header portion in case the data 2468 * is in an mbuf cluster, so that we can safely override the IPv6 2469 * header portion later. 2470 */ 2471 if ((copym->m_flags & M_EXT) != 0 || 2472 copym->m_len < sizeof(struct ip6_hdr)) { 2473 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2474 if (copym == NULL) 2475 return; 2476 } 2477 2478#ifdef DIAGNOSTIC 2479 if (copym->m_len < sizeof(*ip6)) { 2480 m_freem(copym); 2481 return; 2482 } 2483#endif 2484 2485 ip6 = mtod(copym, struct ip6_hdr *); 2486#ifndef SCOPEDROUTING 2487 /* 2488 * clear embedded scope identifiers if necessary. 2489 * in6_clearscope will touch the addresses only when necessary. 2490 */ 2491 in6_clearscope(&ip6->ip6_src); 2492 in6_clearscope(&ip6->ip6_dst); 2493#endif 2494 2495 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2496} 2497 2498/* 2499 * Chop IPv6 header off from the payload. 2500 */ 2501static int 2502ip6_splithdr(m, exthdrs) 2503 struct mbuf *m; 2504 struct ip6_exthdrs *exthdrs; 2505{ 2506 struct mbuf *mh; 2507 struct ip6_hdr *ip6; 2508 2509 ip6 = mtod(m, struct ip6_hdr *); 2510 if (m->m_len > sizeof(*ip6)) { 2511 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2512 if (mh == 0) { 2513 m_freem(m); 2514 return ENOBUFS; 2515 } 2516 M_COPY_PKTHDR(mh, m); 2517 MH_ALIGN(mh, sizeof(*ip6)); 2518 m->m_flags &= ~M_PKTHDR; 2519 m->m_len -= sizeof(*ip6); 2520 m->m_data += sizeof(*ip6); 2521 mh->m_next = m; 2522 m = mh; 2523 m->m_len = sizeof(*ip6); 2524 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2525 } 2526 exthdrs->ip6e_ip6 = m; 2527 return 0; 2528} 2529 2530/* 2531 * Compute IPv6 extension header length. 2532 */ 2533int 2534ip6_optlen(in6p) 2535 struct in6pcb *in6p; 2536{ 2537 int len; 2538 2539 if (!in6p->in6p_outputopts) 2540 return 0; 2541 2542 len = 0; 2543#define elen(x) \ 2544 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2545 2546 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2547 if (in6p->in6p_outputopts->ip6po_rthdr) 2548 /* dest1 is valid with rthdr only */ 2549 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2550 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2551 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2552 return len; 2553#undef elen 2554} 2555