ip6_output.c revision 1.61.2.6
1 /* $NetBSD: ip6_output.c,v 1.61.2.6 2005/03/04 16:53:30 skrll Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.61.2.6 2005/03/04 16:53:30 skrll Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pfil_hooks.h" 70 71 #include <sys/param.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/errno.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 81 #include <net/if.h> 82 #include <net/route.h> 83 #ifdef PFIL_HOOKS 84 #include <net/pfil.h> 85 #endif 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/ip6.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/in6_pcb.h> 93 #include <netinet6/nd6.h> 94 #include <netinet6/ip6protosw.h> 95 96 #ifdef IPSEC 97 #include <netinet6/ipsec.h> 98 #include <netkey/key.h> 99 #endif /* IPSEC */ 100 101 #include <net/net_osdep.h> 102 103 #ifdef PFIL_HOOKS 104 extern struct pfil_head inet6_pfil_hook; /* XXX */ 105 #endif 106 107 struct ip6_exthdrs { 108 struct mbuf *ip6e_ip6; 109 struct mbuf *ip6e_hbh; 110 struct mbuf *ip6e_dest1; 111 struct mbuf *ip6e_rthdr; 112 struct mbuf *ip6e_dest2; 113 }; 114 115 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 116 struct socket *)); 117 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 118 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 119 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 120 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 121 struct ip6_frag **)); 122 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 123 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 124 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 125 struct ifnet *, struct in6_addr *, u_long *, int *)); 126 127 /* 128 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 129 * header (with pri, len, nxt, hlim, src, dst). 130 * This function may modify ver and hlim only. 131 * The mbuf chain containing the packet will be freed. 132 * The mbuf opt, if present, will not be freed. 133 * 134 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 135 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 136 * which is rt_rmx.rmx_mtu. 137 */ 138 int 139 ip6_output(m0, opt, ro, flags, im6o, so, ifpp) 140 struct mbuf *m0; 141 struct ip6_pktopts *opt; 142 struct route_in6 *ro; 143 int flags; 144 struct ip6_moptions *im6o; 145 struct socket *so; 146 struct ifnet **ifpp; /* XXX: just for statistics */ 147 { 148 struct ip6_hdr *ip6, *mhip6; 149 struct ifnet *ifp, *origifp; 150 struct mbuf *m = m0; 151 int hlen, tlen, len, off; 152 struct route_in6 ip6route; 153 struct sockaddr_in6 *dst; 154 int error = 0; 155 u_long mtu; 156 int alwaysfrag, dontfrag; 157 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 158 struct ip6_exthdrs exthdrs; 159 struct in6_addr finaldst; 160 struct route_in6 *ro_pmtu = NULL; 161 int hdrsplit = 0; 162 int needipsec = 0; 163 #ifdef IPSEC 164 int needipsectun = 0; 165 struct secpolicy *sp = NULL; 166 167 ip6 = mtod(m, struct ip6_hdr *); 168 #endif /* IPSEC */ 169 170 #define MAKE_EXTHDR(hp, mp) \ 171 do { \ 172 if (hp) { \ 173 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 174 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 175 ((eh)->ip6e_len + 1) << 3); \ 176 if (error) \ 177 goto freehdrs; \ 178 } \ 179 } while (/*CONSTCOND*/ 0) 180 181 bzero(&exthdrs, sizeof(exthdrs)); 182 if (opt) { 183 /* Hop-by-Hop options header */ 184 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 185 /* Destination options header(1st part) */ 186 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 187 /* Routing header */ 188 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 189 /* Destination options header(2nd part) */ 190 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 191 } 192 193 #ifdef IPSEC 194 if ((flags & IPV6_FORWARDING) != 0) { 195 needipsec = 0; 196 goto skippolicycheck; 197 } 198 199 /* get a security policy for this packet */ 200 if (so == NULL) 201 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 202 else { 203 if (IPSEC_PCB_SKIP_IPSEC(sotoinpcb_hdr(so)->inph_sp, 204 IPSEC_DIR_OUTBOUND)) { 205 needipsec = 0; 206 goto skippolicycheck; 207 } 208 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 209 } 210 211 if (sp == NULL) { 212 ipsec6stat.out_inval++; 213 goto freehdrs; 214 } 215 216 error = 0; 217 218 /* check policy */ 219 switch (sp->policy) { 220 case IPSEC_POLICY_DISCARD: 221 /* 222 * This packet is just discarded. 223 */ 224 ipsec6stat.out_polvio++; 225 goto freehdrs; 226 227 case IPSEC_POLICY_BYPASS: 228 case IPSEC_POLICY_NONE: 229 /* no need to do IPsec. */ 230 needipsec = 0; 231 break; 232 233 case IPSEC_POLICY_IPSEC: 234 if (sp->req == NULL) { 235 /* XXX should be panic ? */ 236 printf("ip6_output: No IPsec request specified.\n"); 237 error = EINVAL; 238 goto freehdrs; 239 } 240 needipsec = 1; 241 break; 242 243 case IPSEC_POLICY_ENTRUST: 244 default: 245 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 246 } 247 248 skippolicycheck:; 249 #endif /* IPSEC */ 250 251 /* 252 * Calculate the total length of the extension header chain. 253 * Keep the length of the unfragmentable part for fragmentation. 254 */ 255 optlen = 0; 256 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 257 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 258 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 259 unfragpartlen = optlen + sizeof(struct ip6_hdr); 260 /* NOTE: we don't add AH/ESP length here. do that later. */ 261 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 262 263 /* 264 * If we need IPsec, or there is at least one extension header, 265 * separate IP6 header from the payload. 266 */ 267 if ((needipsec || optlen) && !hdrsplit) { 268 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 269 m = NULL; 270 goto freehdrs; 271 } 272 m = exthdrs.ip6e_ip6; 273 hdrsplit++; 274 } 275 276 /* adjust pointer */ 277 ip6 = mtod(m, struct ip6_hdr *); 278 279 /* adjust mbuf packet header length */ 280 m->m_pkthdr.len += optlen; 281 plen = m->m_pkthdr.len - sizeof(*ip6); 282 283 /* If this is a jumbo payload, insert a jumbo payload option. */ 284 if (plen > IPV6_MAXPACKET) { 285 if (!hdrsplit) { 286 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 287 m = NULL; 288 goto freehdrs; 289 } 290 m = exthdrs.ip6e_ip6; 291 hdrsplit++; 292 } 293 /* adjust pointer */ 294 ip6 = mtod(m, struct ip6_hdr *); 295 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 296 goto freehdrs; 297 ip6->ip6_plen = 0; 298 } else 299 ip6->ip6_plen = htons(plen); 300 301 /* 302 * Concatenate headers and fill in next header fields. 303 * Here we have, on "m" 304 * IPv6 payload 305 * and we insert headers accordingly. Finally, we should be getting: 306 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 307 * 308 * during the header composing process, "m" points to IPv6 header. 309 * "mprev" points to an extension header prior to esp. 310 */ 311 { 312 u_char *nexthdrp = &ip6->ip6_nxt; 313 struct mbuf *mprev = m; 314 315 /* 316 * we treat dest2 specially. this makes IPsec processing 317 * much easier. the goal here is to make mprev point the 318 * mbuf prior to dest2. 319 * 320 * result: IPv6 dest2 payload 321 * m and mprev will point to IPv6 header. 322 */ 323 if (exthdrs.ip6e_dest2) { 324 if (!hdrsplit) 325 panic("assumption failed: hdr not split"); 326 exthdrs.ip6e_dest2->m_next = m->m_next; 327 m->m_next = exthdrs.ip6e_dest2; 328 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 329 ip6->ip6_nxt = IPPROTO_DSTOPTS; 330 } 331 332 #define MAKE_CHAIN(m, mp, p, i)\ 333 do {\ 334 if (m) {\ 335 if (!hdrsplit) \ 336 panic("assumption failed: hdr not split"); \ 337 *mtod((m), u_char *) = *(p);\ 338 *(p) = (i);\ 339 p = mtod((m), u_char *);\ 340 (m)->m_next = (mp)->m_next;\ 341 (mp)->m_next = (m);\ 342 (mp) = (m);\ 343 }\ 344 } while (/*CONSTCOND*/ 0) 345 /* 346 * result: IPv6 hbh dest1 rthdr dest2 payload 347 * m will point to IPv6 header. mprev will point to the 348 * extension header prior to dest2 (rthdr in the above case). 349 */ 350 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 351 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 352 IPPROTO_DSTOPTS); 353 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 354 IPPROTO_ROUTING); 355 356 #ifdef IPSEC 357 if (!needipsec) 358 goto skip_ipsec2; 359 360 /* 361 * pointers after IPsec headers are not valid any more. 362 * other pointers need a great care too. 363 * (IPsec routines should not mangle mbufs prior to AH/ESP) 364 */ 365 exthdrs.ip6e_dest2 = NULL; 366 367 { 368 struct ip6_rthdr *rh = NULL; 369 int segleft_org = 0; 370 struct ipsec_output_state state; 371 372 if (exthdrs.ip6e_rthdr) { 373 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 374 segleft_org = rh->ip6r_segleft; 375 rh->ip6r_segleft = 0; 376 } 377 378 bzero(&state, sizeof(state)); 379 state.m = m; 380 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 381 &needipsectun); 382 m = state.m; 383 if (error) { 384 /* mbuf is already reclaimed in ipsec6_output_trans. */ 385 m = NULL; 386 switch (error) { 387 case EHOSTUNREACH: 388 case ENETUNREACH: 389 case EMSGSIZE: 390 case ENOBUFS: 391 case ENOMEM: 392 break; 393 default: 394 printf("ip6_output (ipsec): error code %d\n", error); 395 /* FALLTHROUGH */ 396 case ENOENT: 397 /* don't show these error codes to the user */ 398 error = 0; 399 break; 400 } 401 goto bad; 402 } 403 if (exthdrs.ip6e_rthdr) { 404 /* ah6_output doesn't modify mbuf chain */ 405 rh->ip6r_segleft = segleft_org; 406 } 407 } 408 skip_ipsec2:; 409 #endif 410 } 411 412 /* 413 * If there is a routing header, replace destination address field 414 * with the first hop of the routing header. 415 */ 416 if (exthdrs.ip6e_rthdr) { 417 struct ip6_rthdr *rh; 418 struct ip6_rthdr0 *rh0; 419 struct in6_addr *addr; 420 421 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 422 struct ip6_rthdr *)); 423 finaldst = ip6->ip6_dst; 424 switch (rh->ip6r_type) { 425 case IPV6_RTHDR_TYPE_0: 426 rh0 = (struct ip6_rthdr0 *)rh; 427 addr = (struct in6_addr *)(rh0 + 1); 428 ip6->ip6_dst = addr[0]; 429 bcopy(&addr[1], &addr[0], 430 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 431 addr[rh0->ip6r0_segleft - 1] = finaldst; 432 break; 433 default: /* is it possible? */ 434 error = EINVAL; 435 goto bad; 436 } 437 } 438 439 /* Source address validation */ 440 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 441 (flags & IPV6_UNSPECSRC) == 0) { 442 error = EOPNOTSUPP; 443 ip6stat.ip6s_badscope++; 444 goto bad; 445 } 446 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 447 error = EOPNOTSUPP; 448 ip6stat.ip6s_badscope++; 449 goto bad; 450 } 451 452 ip6stat.ip6s_localout++; 453 454 /* 455 * Route packet. 456 */ 457 /* initialize cached route */ 458 if (ro == 0) { 459 ro = &ip6route; 460 bzero((caddr_t)ro, sizeof(*ro)); 461 } 462 ro_pmtu = ro; 463 if (opt && opt->ip6po_rthdr) 464 ro = &opt->ip6po_route; 465 dst = (struct sockaddr_in6 *)&ro->ro_dst; 466 /* 467 * If there is a cached route, 468 * check that it is to the same destination 469 * and is still up. If not, free it and try again. 470 */ 471 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 472 dst->sin6_family != AF_INET6 || 473 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 474 RTFREE(ro->ro_rt); 475 ro->ro_rt = (struct rtentry *)0; 476 } 477 if (ro->ro_rt == 0) { 478 bzero(dst, sizeof(*dst)); 479 dst->sin6_family = AF_INET6; 480 dst->sin6_len = sizeof(struct sockaddr_in6); 481 dst->sin6_addr = ip6->ip6_dst; 482 } 483 #ifdef IPSEC 484 if (needipsec && needipsectun) { 485 struct ipsec_output_state state; 486 487 /* 488 * All the extension headers will become inaccessible 489 * (since they can be encrypted). 490 * Don't panic, we need no more updates to extension headers 491 * on inner IPv6 packet (since they are now encapsulated). 492 * 493 * IPv6 [ESP|AH] IPv6 [extension headers] payload 494 */ 495 bzero(&exthdrs, sizeof(exthdrs)); 496 exthdrs.ip6e_ip6 = m; 497 498 bzero(&state, sizeof(state)); 499 state.m = m; 500 state.ro = (struct route *)ro; 501 state.dst = (struct sockaddr *)dst; 502 503 error = ipsec6_output_tunnel(&state, sp, flags); 504 505 m = state.m; 506 ro_pmtu = ro = (struct route_in6 *)state.ro; 507 dst = (struct sockaddr_in6 *)state.dst; 508 if (error) { 509 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 510 m0 = m = NULL; 511 m = NULL; 512 switch (error) { 513 case EHOSTUNREACH: 514 case ENETUNREACH: 515 case EMSGSIZE: 516 case ENOBUFS: 517 case ENOMEM: 518 break; 519 default: 520 printf("ip6_output (ipsec): error code %d\n", error); 521 /* FALLTHROUGH */ 522 case ENOENT: 523 /* don't show these error codes to the user */ 524 error = 0; 525 break; 526 } 527 goto bad; 528 } 529 530 exthdrs.ip6e_ip6 = m; 531 } 532 #endif /* IPSEC */ 533 534 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 535 /* Unicast */ 536 537 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 538 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 539 /* xxx 540 * interface selection comes here 541 * if an interface is specified from an upper layer, 542 * ifp must point it. 543 */ 544 if (ro->ro_rt == 0) { 545 /* 546 * non-bsdi always clone routes, if parent is 547 * PRF_CLONING. 548 */ 549 rtalloc((struct route *)ro); 550 } 551 if (ro->ro_rt == 0) { 552 ip6stat.ip6s_noroute++; 553 error = EHOSTUNREACH; 554 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 555 goto bad; 556 } 557 ifp = ro->ro_rt->rt_ifp; 558 ro->ro_rt->rt_use++; 559 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 560 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 561 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 562 563 in6_ifstat_inc(ifp, ifs6_out_request); 564 565 /* 566 * Check if the outgoing interface conflicts with 567 * the interface specified by ifi6_ifindex (if specified). 568 * Note that loopback interface is always okay. 569 * (this may happen when we are sending a packet to one of 570 * our own addresses.) 571 */ 572 if (opt && opt->ip6po_pktinfo && 573 opt->ip6po_pktinfo->ipi6_ifindex) { 574 if (!(ifp->if_flags & IFF_LOOPBACK) && 575 ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 576 ip6stat.ip6s_noroute++; 577 in6_ifstat_inc(ifp, ifs6_out_discard); 578 error = EHOSTUNREACH; 579 goto bad; 580 } 581 } 582 583 if (opt && opt->ip6po_hlim != -1) 584 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 585 } else { 586 /* Multicast */ 587 struct in6_multi *in6m; 588 589 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 590 591 /* 592 * See if the caller provided any multicast options 593 */ 594 ifp = NULL; 595 if (im6o != NULL) { 596 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 597 if (im6o->im6o_multicast_ifp != NULL) 598 ifp = im6o->im6o_multicast_ifp; 599 } else 600 ip6->ip6_hlim = ip6_defmcasthlim; 601 602 /* 603 * See if the caller provided the outgoing interface 604 * as an ancillary data. 605 * Boundary check for ifindex is assumed to be already done. 606 */ 607 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 608 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 609 610 /* 611 * If the destination is a node-local scope multicast, 612 * the packet should be loop-backed only. 613 */ 614 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 615 /* 616 * If the outgoing interface is already specified, 617 * it should be a loopback interface. 618 */ 619 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 620 ip6stat.ip6s_badscope++; 621 error = ENETUNREACH; /* XXX: better error? */ 622 /* XXX correct ifp? */ 623 in6_ifstat_inc(ifp, ifs6_out_discard); 624 goto bad; 625 } else 626 ifp = lo0ifp; 627 } 628 629 if (opt && opt->ip6po_hlim != -1) 630 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 631 632 /* 633 * If caller did not provide an interface lookup a 634 * default in the routing table. This is either a 635 * default for the speicfied group (i.e. a host 636 * route), or a multicast default (a route for the 637 * ``net'' ff00::/8). 638 */ 639 if (ifp == NULL) { 640 if (ro->ro_rt == 0) { 641 ro->ro_rt = rtalloc1((struct sockaddr *) 642 &ro->ro_dst, 0); 643 } 644 if (ro->ro_rt == 0) { 645 ip6stat.ip6s_noroute++; 646 error = EHOSTUNREACH; 647 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 648 goto bad; 649 } 650 ifp = ro->ro_rt->rt_ifp; 651 ro->ro_rt->rt_use++; 652 } 653 654 if ((flags & IPV6_FORWARDING) == 0) 655 in6_ifstat_inc(ifp, ifs6_out_request); 656 in6_ifstat_inc(ifp, ifs6_out_mcast); 657 658 /* 659 * Confirm that the outgoing interface supports multicast. 660 */ 661 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 662 ip6stat.ip6s_noroute++; 663 in6_ifstat_inc(ifp, ifs6_out_discard); 664 error = ENETUNREACH; 665 goto bad; 666 } 667 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 668 if (in6m != NULL && 669 (im6o == NULL || im6o->im6o_multicast_loop)) { 670 /* 671 * If we belong to the destination multicast group 672 * on the outgoing interface, and the caller did not 673 * forbid loopback, loop back a copy. 674 */ 675 ip6_mloopback(ifp, m, dst); 676 } else { 677 /* 678 * If we are acting as a multicast router, perform 679 * multicast forwarding as if the packet had just 680 * arrived on the interface to which we are about 681 * to send. The multicast forwarding function 682 * recursively calls this function, using the 683 * IPV6_FORWARDING flag to prevent infinite recursion. 684 * 685 * Multicasts that are looped back by ip6_mloopback(), 686 * above, will be forwarded by the ip6_input() routine, 687 * if necessary. 688 */ 689 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 690 if (ip6_mforward(ip6, ifp, m) != 0) { 691 m_freem(m); 692 goto done; 693 } 694 } 695 } 696 /* 697 * Multicasts with a hoplimit of zero may be looped back, 698 * above, but must not be transmitted on a network. 699 * Also, multicasts addressed to the loopback interface 700 * are not sent -- the above call to ip6_mloopback() will 701 * loop back a copy if this host actually belongs to the 702 * destination group on the loopback interface. 703 */ 704 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 705 m_freem(m); 706 goto done; 707 } 708 } 709 710 /* 711 * Fill the outgoing inteface to tell the upper layer 712 * to increment per-interface statistics. 713 */ 714 if (ifpp) 715 *ifpp = ifp; 716 717 /* Determine path MTU. */ 718 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 719 &alwaysfrag)) != 0) 720 goto bad; 721 #ifdef IPSEC 722 if (needipsectun) 723 mtu = IPV6_MMTU; 724 #endif 725 726 /* 727 * The caller of this function may specify to use the minimum MTU 728 * in some cases. 729 */ 730 if (mtu > IPV6_MMTU) { 731 if ((flags & IPV6_MINMTU)) 732 mtu = IPV6_MMTU; 733 } 734 735 /* Fake scoped addresses */ 736 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 737 /* 738 * If source or destination address is a scoped address, and 739 * the packet is going to be sent to a loopback interface, 740 * we should keep the original interface. 741 */ 742 743 /* 744 * XXX: this is a very experimental and temporary solution. 745 * We eventually have sockaddr_in6 and use the sin6_scope_id 746 * field of the structure here. 747 * We rely on the consistency between two scope zone ids 748 * of source add destination, which should already be assured 749 * Larger scopes than link will be supported in the near 750 * future. 751 */ 752 origifp = NULL; 753 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 754 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 755 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 756 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 757 /* 758 * XXX: origifp can be NULL even in those two cases above. 759 * For example, if we remove the (only) link-local address 760 * from the loopback interface, and try to send a link-local 761 * address without link-id information. Then the source 762 * address is ::1, and the destination address is the 763 * link-local address with its s6_addr16[1] being zero. 764 * What is worse, if the packet goes to the loopback interface 765 * by a default rejected route, the null pointer would be 766 * passed to looutput, and the kernel would hang. 767 * The following last resort would prevent such disaster. 768 */ 769 if (origifp == NULL) 770 origifp = ifp; 771 } else 772 origifp = ifp; 773 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 774 ip6->ip6_src.s6_addr16[1] = 0; 775 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 776 ip6->ip6_dst.s6_addr16[1] = 0; 777 778 /* 779 * If the outgoing packet contains a hop-by-hop options header, 780 * it must be examined and processed even by the source node. 781 * (RFC 2460, section 4.) 782 */ 783 if (exthdrs.ip6e_hbh) { 784 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 785 u_int32_t dummy1; /* XXX unused */ 786 u_int32_t dummy2; /* XXX unused */ 787 788 /* 789 * XXX: if we have to send an ICMPv6 error to the sender, 790 * we need the M_LOOP flag since icmp6_error() expects 791 * the IPv6 and the hop-by-hop options header are 792 * continuous unless the flag is set. 793 */ 794 m->m_flags |= M_LOOP; 795 m->m_pkthdr.rcvif = ifp; 796 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 797 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 798 &dummy1, &dummy2) < 0) { 799 /* m was already freed at this point */ 800 error = EINVAL;/* better error? */ 801 goto done; 802 } 803 m->m_flags &= ~M_LOOP; /* XXX */ 804 m->m_pkthdr.rcvif = NULL; 805 } 806 807 #ifdef PFIL_HOOKS 808 /* 809 * Run through list of hooks for output packets. 810 */ 811 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 812 goto done; 813 if (m == NULL) 814 goto done; 815 ip6 = mtod(m, struct ip6_hdr *); 816 #endif /* PFIL_HOOKS */ 817 /* 818 * Send the packet to the outgoing interface. 819 * If necessary, do IPv6 fragmentation before sending. 820 * 821 * the logic here is rather complex: 822 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 823 * 1-a: send as is if tlen <= path mtu 824 * 1-b: fragment if tlen > path mtu 825 * 826 * 2: if user asks us not to fragment (dontfrag == 1) 827 * 2-a: send as is if tlen <= interface mtu 828 * 2-b: error if tlen > interface mtu 829 * 830 * 3: if we always need to attach fragment header (alwaysfrag == 1) 831 * always fragment 832 * 833 * 4: if dontfrag == 1 && alwaysfrag == 1 834 * error, as we cannot handle this conflicting request 835 */ 836 tlen = m->m_pkthdr.len; 837 838 dontfrag = 0; 839 if (dontfrag && alwaysfrag) { /* case 4 */ 840 /* conflicting request - can't transmit */ 841 error = EMSGSIZE; 842 goto bad; 843 } 844 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 845 /* 846 * Even if the DONTFRAG option is specified, we cannot send the 847 * packet when the data length is larger than the MTU of the 848 * outgoing interface. 849 * Notify the error by sending IPV6_PATHMTU ancillary data as 850 * well as returning an error code (the latter is not described 851 * in the API spec.) 852 */ 853 u_int32_t mtu32; 854 struct ip6ctlparam ip6cp; 855 856 mtu32 = (u_int32_t)mtu; 857 bzero(&ip6cp, sizeof(ip6cp)); 858 ip6cp.ip6c_cmdarg = (void *)&mtu32; 859 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 860 (void *)&ip6cp); 861 862 error = EMSGSIZE; 863 goto bad; 864 } 865 866 /* 867 * transmit packet without fragmentation 868 */ 869 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 870 struct in6_ifaddr *ia6; 871 872 ip6 = mtod(m, struct ip6_hdr *); 873 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 874 if (ia6) { 875 /* Record statistics for this interface address. */ 876 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 877 } 878 #ifdef IPSEC 879 /* clean ipsec history once it goes out of the node */ 880 ipsec_delaux(m); 881 #endif 882 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 883 goto done; 884 } 885 886 /* 887 * try to fragment the packet. case 1-b and 3 888 */ 889 if (mtu < IPV6_MMTU) { 890 /* path MTU cannot be less than IPV6_MMTU */ 891 error = EMSGSIZE; 892 in6_ifstat_inc(ifp, ifs6_out_fragfail); 893 goto bad; 894 } else if (ip6->ip6_plen == 0) { 895 /* jumbo payload cannot be fragmented */ 896 error = EMSGSIZE; 897 in6_ifstat_inc(ifp, ifs6_out_fragfail); 898 goto bad; 899 } else { 900 struct mbuf **mnext, *m_frgpart; 901 struct ip6_frag *ip6f; 902 u_int32_t id = htonl(ip6_randomid()); 903 u_char nextproto; 904 struct ip6ctlparam ip6cp; 905 u_int32_t mtu32; 906 907 /* 908 * Too large for the destination or interface; 909 * fragment if possible. 910 * Must be able to put at least 8 bytes per fragment. 911 */ 912 hlen = unfragpartlen; 913 if (mtu > IPV6_MAXPACKET) 914 mtu = IPV6_MAXPACKET; 915 916 /* Notify a proper path MTU to applications. */ 917 mtu32 = (u_int32_t)mtu; 918 bzero(&ip6cp, sizeof(ip6cp)); 919 ip6cp.ip6c_cmdarg = (void *)&mtu32; 920 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 921 (void *)&ip6cp); 922 923 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 924 if (len < 8) { 925 error = EMSGSIZE; 926 in6_ifstat_inc(ifp, ifs6_out_fragfail); 927 goto bad; 928 } 929 930 mnext = &m->m_nextpkt; 931 932 /* 933 * Change the next header field of the last header in the 934 * unfragmentable part. 935 */ 936 if (exthdrs.ip6e_rthdr) { 937 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 938 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 939 } else if (exthdrs.ip6e_dest1) { 940 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 941 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 942 } else if (exthdrs.ip6e_hbh) { 943 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 944 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 945 } else { 946 nextproto = ip6->ip6_nxt; 947 ip6->ip6_nxt = IPPROTO_FRAGMENT; 948 } 949 950 /* 951 * Loop through length of segment after first fragment, 952 * make new header and copy data of each part and link onto 953 * chain. 954 */ 955 m0 = m; 956 for (off = hlen; off < tlen; off += len) { 957 struct mbuf *mlast; 958 959 MGETHDR(m, M_DONTWAIT, MT_HEADER); 960 if (!m) { 961 error = ENOBUFS; 962 ip6stat.ip6s_odropped++; 963 goto sendorfree; 964 } 965 m->m_pkthdr.rcvif = NULL; 966 m->m_flags = m0->m_flags & M_COPYFLAGS; 967 *mnext = m; 968 mnext = &m->m_nextpkt; 969 m->m_data += max_linkhdr; 970 mhip6 = mtod(m, struct ip6_hdr *); 971 *mhip6 = *ip6; 972 m->m_len = sizeof(*mhip6); 973 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 974 if (error) { 975 ip6stat.ip6s_odropped++; 976 goto sendorfree; 977 } 978 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 979 if (off + len >= tlen) 980 len = tlen - off; 981 else 982 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 983 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 984 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 985 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 986 error = ENOBUFS; 987 ip6stat.ip6s_odropped++; 988 goto sendorfree; 989 } 990 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 991 ; 992 mlast->m_next = m_frgpart; 993 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 994 m->m_pkthdr.rcvif = (struct ifnet *)0; 995 ip6f->ip6f_reserved = 0; 996 ip6f->ip6f_ident = id; 997 ip6f->ip6f_nxt = nextproto; 998 ip6stat.ip6s_ofragments++; 999 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1000 } 1001 1002 in6_ifstat_inc(ifp, ifs6_out_fragok); 1003 } 1004 1005 /* 1006 * Remove leading garbages. 1007 */ 1008 sendorfree: 1009 m = m0->m_nextpkt; 1010 m0->m_nextpkt = 0; 1011 m_freem(m0); 1012 for (m0 = m; m; m = m0) { 1013 m0 = m->m_nextpkt; 1014 m->m_nextpkt = 0; 1015 if (error == 0) { 1016 struct in6_ifaddr *ia6; 1017 ip6 = mtod(m, struct ip6_hdr *); 1018 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1019 if (ia6) { 1020 /* 1021 * Record statistics for this interface 1022 * address. 1023 */ 1024 ia6->ia_ifa.ifa_data.ifad_outbytes += 1025 m->m_pkthdr.len; 1026 } 1027 #ifdef IPSEC 1028 /* clean ipsec history once it goes out of the node */ 1029 ipsec_delaux(m); 1030 #endif 1031 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1032 } else 1033 m_freem(m); 1034 } 1035 1036 if (error == 0) 1037 ip6stat.ip6s_fragmented++; 1038 1039 done: 1040 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1041 RTFREE(ro->ro_rt); 1042 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1043 RTFREE(ro_pmtu->ro_rt); 1044 } 1045 1046 #ifdef IPSEC 1047 if (sp != NULL) 1048 key_freesp(sp); 1049 #endif /* IPSEC */ 1050 1051 return (error); 1052 1053 freehdrs: 1054 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1055 m_freem(exthdrs.ip6e_dest1); 1056 m_freem(exthdrs.ip6e_rthdr); 1057 m_freem(exthdrs.ip6e_dest2); 1058 /* FALLTHROUGH */ 1059 bad: 1060 m_freem(m); 1061 goto done; 1062 } 1063 1064 static int 1065 ip6_copyexthdr(mp, hdr, hlen) 1066 struct mbuf **mp; 1067 caddr_t hdr; 1068 int hlen; 1069 { 1070 struct mbuf *m; 1071 1072 if (hlen > MCLBYTES) 1073 return (ENOBUFS); /* XXX */ 1074 1075 MGET(m, M_DONTWAIT, MT_DATA); 1076 if (!m) 1077 return (ENOBUFS); 1078 1079 if (hlen > MLEN) { 1080 MCLGET(m, M_DONTWAIT); 1081 if ((m->m_flags & M_EXT) == 0) { 1082 m_free(m); 1083 return (ENOBUFS); 1084 } 1085 } 1086 m->m_len = hlen; 1087 if (hdr) 1088 bcopy(hdr, mtod(m, caddr_t), hlen); 1089 1090 *mp = m; 1091 return (0); 1092 } 1093 1094 /* 1095 * Insert jumbo payload option. 1096 */ 1097 static int 1098 ip6_insert_jumboopt(exthdrs, plen) 1099 struct ip6_exthdrs *exthdrs; 1100 u_int32_t plen; 1101 { 1102 struct mbuf *mopt; 1103 u_int8_t *optbuf; 1104 u_int32_t v; 1105 1106 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1107 1108 /* 1109 * If there is no hop-by-hop options header, allocate new one. 1110 * If there is one but it doesn't have enough space to store the 1111 * jumbo payload option, allocate a cluster to store the whole options. 1112 * Otherwise, use it to store the options. 1113 */ 1114 if (exthdrs->ip6e_hbh == 0) { 1115 MGET(mopt, M_DONTWAIT, MT_DATA); 1116 if (mopt == 0) 1117 return (ENOBUFS); 1118 mopt->m_len = JUMBOOPTLEN; 1119 optbuf = mtod(mopt, u_int8_t *); 1120 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1121 exthdrs->ip6e_hbh = mopt; 1122 } else { 1123 struct ip6_hbh *hbh; 1124 1125 mopt = exthdrs->ip6e_hbh; 1126 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1127 /* 1128 * XXX assumption: 1129 * - exthdrs->ip6e_hbh is not referenced from places 1130 * other than exthdrs. 1131 * - exthdrs->ip6e_hbh is not an mbuf chain. 1132 */ 1133 int oldoptlen = mopt->m_len; 1134 struct mbuf *n; 1135 1136 /* 1137 * XXX: give up if the whole (new) hbh header does 1138 * not fit even in an mbuf cluster. 1139 */ 1140 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1141 return (ENOBUFS); 1142 1143 /* 1144 * As a consequence, we must always prepare a cluster 1145 * at this point. 1146 */ 1147 MGET(n, M_DONTWAIT, MT_DATA); 1148 if (n) { 1149 MCLGET(n, M_DONTWAIT); 1150 if ((n->m_flags & M_EXT) == 0) { 1151 m_freem(n); 1152 n = NULL; 1153 } 1154 } 1155 if (!n) 1156 return (ENOBUFS); 1157 n->m_len = oldoptlen + JUMBOOPTLEN; 1158 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1159 oldoptlen); 1160 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1161 m_freem(mopt); 1162 mopt = exthdrs->ip6e_hbh = n; 1163 } else { 1164 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1165 mopt->m_len += JUMBOOPTLEN; 1166 } 1167 optbuf[0] = IP6OPT_PADN; 1168 optbuf[1] = 0; 1169 1170 /* 1171 * Adjust the header length according to the pad and 1172 * the jumbo payload option. 1173 */ 1174 hbh = mtod(mopt, struct ip6_hbh *); 1175 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1176 } 1177 1178 /* fill in the option. */ 1179 optbuf[2] = IP6OPT_JUMBO; 1180 optbuf[3] = 4; 1181 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1182 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1183 1184 /* finally, adjust the packet header length */ 1185 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1186 1187 return (0); 1188 #undef JUMBOOPTLEN 1189 } 1190 1191 /* 1192 * Insert fragment header and copy unfragmentable header portions. 1193 */ 1194 static int 1195 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1196 struct mbuf *m0, *m; 1197 int hlen; 1198 struct ip6_frag **frghdrp; 1199 { 1200 struct mbuf *n, *mlast; 1201 1202 if (hlen > sizeof(struct ip6_hdr)) { 1203 n = m_copym(m0, sizeof(struct ip6_hdr), 1204 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1205 if (n == 0) 1206 return (ENOBUFS); 1207 m->m_next = n; 1208 } else 1209 n = m; 1210 1211 /* Search for the last mbuf of unfragmentable part. */ 1212 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1213 ; 1214 1215 if ((mlast->m_flags & M_EXT) == 0 && 1216 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1217 /* use the trailing space of the last mbuf for the fragment hdr */ 1218 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1219 mlast->m_len); 1220 mlast->m_len += sizeof(struct ip6_frag); 1221 m->m_pkthdr.len += sizeof(struct ip6_frag); 1222 } else { 1223 /* allocate a new mbuf for the fragment header */ 1224 struct mbuf *mfrg; 1225 1226 MGET(mfrg, M_DONTWAIT, MT_DATA); 1227 if (mfrg == 0) 1228 return (ENOBUFS); 1229 mfrg->m_len = sizeof(struct ip6_frag); 1230 *frghdrp = mtod(mfrg, struct ip6_frag *); 1231 mlast->m_next = mfrg; 1232 } 1233 1234 return (0); 1235 } 1236 1237 static int 1238 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1239 struct route_in6 *ro_pmtu, *ro; 1240 struct ifnet *ifp; 1241 struct in6_addr *dst; 1242 u_long *mtup; 1243 int *alwaysfragp; 1244 { 1245 u_int32_t mtu = 0; 1246 int alwaysfrag = 0; 1247 int error = 0; 1248 1249 if (ro_pmtu != ro) { 1250 /* The first hop and the final destination may differ. */ 1251 struct sockaddr_in6 *sa6_dst = 1252 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1253 if (ro_pmtu->ro_rt && 1254 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1255 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1256 RTFREE(ro_pmtu->ro_rt); 1257 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1258 } 1259 if (ro_pmtu->ro_rt == NULL) { 1260 bzero(sa6_dst, sizeof(*sa6_dst)); /* for safety */ 1261 sa6_dst->sin6_family = AF_INET6; 1262 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1263 sa6_dst->sin6_addr = *dst; 1264 1265 rtalloc((struct route *)ro_pmtu); 1266 } 1267 } 1268 if (ro_pmtu->ro_rt) { 1269 u_int32_t ifmtu; 1270 1271 if (ifp == NULL) 1272 ifp = ro_pmtu->ro_rt->rt_ifp; 1273 ifmtu = IN6_LINKMTU(ifp); 1274 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1275 if (mtu == 0) 1276 mtu = ifmtu; 1277 else if (mtu < IPV6_MMTU) { 1278 /* 1279 * RFC2460 section 5, last paragraph: 1280 * if we record ICMPv6 too big message with 1281 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1282 * or smaller, with fragment header attached. 1283 * (fragment header is needed regardless from the 1284 * packet size, for translators to identify packets) 1285 */ 1286 alwaysfrag = 1; 1287 mtu = IPV6_MMTU; 1288 } else if (mtu > ifmtu) { 1289 /* 1290 * The MTU on the route is larger than the MTU on 1291 * the interface! This shouldn't happen, unless the 1292 * MTU of the interface has been changed after the 1293 * interface was brought up. Change the MTU in the 1294 * route to match the interface MTU (as long as the 1295 * field isn't locked). 1296 */ 1297 mtu = ifmtu; 1298 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1299 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1300 } 1301 } else if (ifp) { 1302 mtu = IN6_LINKMTU(ifp); 1303 } else 1304 error = EHOSTUNREACH; /* XXX */ 1305 1306 *mtup = mtu; 1307 if (alwaysfragp) 1308 *alwaysfragp = alwaysfrag; 1309 return (error); 1310 } 1311 1312 /* 1313 * IP6 socket option processing. 1314 */ 1315 int 1316 ip6_ctloutput(op, so, level, optname, mp) 1317 int op; 1318 struct socket *so; 1319 int level, optname; 1320 struct mbuf **mp; 1321 { 1322 struct in6pcb *in6p = sotoin6pcb(so); 1323 struct mbuf *m = *mp; 1324 int optval = 0; 1325 int error = 0; 1326 struct proc *p = curproc; /* XXX */ 1327 1328 if (level == IPPROTO_IPV6) { 1329 switch (op) { 1330 case PRCO_SETOPT: 1331 switch (optname) { 1332 case IPV6_PKTOPTIONS: 1333 /* m is freed in ip6_pcbopts */ 1334 return (ip6_pcbopts(&in6p->in6p_outputopts, 1335 m, so)); 1336 case IPV6_HOPOPTS: 1337 case IPV6_DSTOPTS: 1338 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1339 error = EPERM; 1340 break; 1341 } 1342 /* FALLTHROUGH */ 1343 case IPV6_UNICAST_HOPS: 1344 case IPV6_RECVOPTS: 1345 case IPV6_RECVRETOPTS: 1346 case IPV6_RECVDSTADDR: 1347 case IPV6_PKTINFO: 1348 case IPV6_HOPLIMIT: 1349 case IPV6_RTHDR: 1350 case IPV6_FAITH: 1351 case IPV6_V6ONLY: 1352 case IPV6_USE_MIN_MTU: 1353 if (!m || m->m_len != sizeof(int)) { 1354 error = EINVAL; 1355 break; 1356 } 1357 optval = *mtod(m, int *); 1358 switch (optname) { 1359 1360 case IPV6_UNICAST_HOPS: 1361 if (optval < -1 || optval >= 256) 1362 error = EINVAL; 1363 else { 1364 /* -1 = kernel default */ 1365 in6p->in6p_hops = optval; 1366 } 1367 break; 1368 #define OPTSET(bit) \ 1369 do { \ 1370 if (optval) \ 1371 in6p->in6p_flags |= (bit); \ 1372 else \ 1373 in6p->in6p_flags &= ~(bit); \ 1374 } while (/*CONSTCOND*/ 0) 1375 1376 case IPV6_RECVOPTS: 1377 OPTSET(IN6P_RECVOPTS); 1378 break; 1379 1380 case IPV6_RECVRETOPTS: 1381 OPTSET(IN6P_RECVRETOPTS); 1382 break; 1383 1384 case IPV6_RECVDSTADDR: 1385 OPTSET(IN6P_RECVDSTADDR); 1386 break; 1387 1388 case IPV6_PKTINFO: 1389 OPTSET(IN6P_PKTINFO); 1390 break; 1391 1392 case IPV6_HOPLIMIT: 1393 OPTSET(IN6P_HOPLIMIT); 1394 break; 1395 1396 case IPV6_HOPOPTS: 1397 OPTSET(IN6P_HOPOPTS); 1398 break; 1399 1400 case IPV6_DSTOPTS: 1401 OPTSET(IN6P_DSTOPTS); 1402 break; 1403 1404 case IPV6_RTHDR: 1405 OPTSET(IN6P_RTHDR); 1406 break; 1407 1408 case IPV6_FAITH: 1409 OPTSET(IN6P_FAITH); 1410 break; 1411 1412 case IPV6_USE_MIN_MTU: 1413 OPTSET(IN6P_MINMTU); 1414 break; 1415 1416 case IPV6_V6ONLY: 1417 /* 1418 * make setsockopt(IPV6_V6ONLY) 1419 * available only prior to bind(2). 1420 * see ipng mailing list, Jun 22 2001. 1421 */ 1422 if (in6p->in6p_lport || 1423 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1424 error = EINVAL; 1425 break; 1426 } 1427 #ifdef INET6_BINDV6ONLY 1428 if (!optval) 1429 error = EINVAL; 1430 #else 1431 OPTSET(IN6P_IPV6_V6ONLY); 1432 #endif 1433 break; 1434 } 1435 break; 1436 #undef OPTSET 1437 1438 case IPV6_MULTICAST_IF: 1439 case IPV6_MULTICAST_HOPS: 1440 case IPV6_MULTICAST_LOOP: 1441 case IPV6_JOIN_GROUP: 1442 case IPV6_LEAVE_GROUP: 1443 error = ip6_setmoptions(optname, 1444 &in6p->in6p_moptions, m); 1445 break; 1446 1447 case IPV6_PORTRANGE: 1448 optval = *mtod(m, int *); 1449 1450 switch (optval) { 1451 case IPV6_PORTRANGE_DEFAULT: 1452 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1453 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1454 break; 1455 1456 case IPV6_PORTRANGE_HIGH: 1457 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1458 in6p->in6p_flags |= IN6P_HIGHPORT; 1459 break; 1460 1461 case IPV6_PORTRANGE_LOW: 1462 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1463 in6p->in6p_flags |= IN6P_LOWPORT; 1464 break; 1465 1466 default: 1467 error = EINVAL; 1468 break; 1469 } 1470 break; 1471 1472 #ifdef IPSEC 1473 case IPV6_IPSEC_POLICY: 1474 { 1475 caddr_t req = NULL; 1476 size_t len = 0; 1477 1478 int priv = 0; 1479 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1480 priv = 0; 1481 else 1482 priv = 1; 1483 if (m) { 1484 req = mtod(m, caddr_t); 1485 len = m->m_len; 1486 } 1487 error = ipsec6_set_policy(in6p, 1488 optname, req, len, priv); 1489 } 1490 break; 1491 #endif /* IPSEC */ 1492 1493 default: 1494 error = ENOPROTOOPT; 1495 break; 1496 } 1497 if (m) 1498 (void)m_free(m); 1499 break; 1500 1501 case PRCO_GETOPT: 1502 switch (optname) { 1503 1504 case IPV6_OPTIONS: 1505 case IPV6_RETOPTS: 1506 error = ENOPROTOOPT; 1507 break; 1508 1509 case IPV6_PKTOPTIONS: 1510 if (in6p->in6p_options) { 1511 *mp = m_copym(in6p->in6p_options, 0, 1512 M_COPYALL, M_WAIT); 1513 } else { 1514 *mp = m_get(M_WAIT, MT_SOOPTS); 1515 (*mp)->m_len = 0; 1516 } 1517 break; 1518 1519 case IPV6_HOPOPTS: 1520 case IPV6_DSTOPTS: 1521 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1522 error = EPERM; 1523 break; 1524 } 1525 /* FALLTHROUGH */ 1526 case IPV6_UNICAST_HOPS: 1527 case IPV6_RECVOPTS: 1528 case IPV6_RECVRETOPTS: 1529 case IPV6_RECVDSTADDR: 1530 case IPV6_PORTRANGE: 1531 case IPV6_PKTINFO: 1532 case IPV6_HOPLIMIT: 1533 case IPV6_RTHDR: 1534 case IPV6_FAITH: 1535 case IPV6_V6ONLY: 1536 case IPV6_USE_MIN_MTU: 1537 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1538 m->m_len = sizeof(int); 1539 switch (optname) { 1540 1541 case IPV6_UNICAST_HOPS: 1542 optval = in6p->in6p_hops; 1543 break; 1544 1545 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1546 1547 case IPV6_RECVOPTS: 1548 optval = OPTBIT(IN6P_RECVOPTS); 1549 break; 1550 1551 case IPV6_RECVRETOPTS: 1552 optval = OPTBIT(IN6P_RECVRETOPTS); 1553 break; 1554 1555 case IPV6_RECVDSTADDR: 1556 optval = OPTBIT(IN6P_RECVDSTADDR); 1557 break; 1558 1559 case IPV6_PORTRANGE: 1560 { 1561 int flags; 1562 flags = in6p->in6p_flags; 1563 if (flags & IN6P_HIGHPORT) 1564 optval = IPV6_PORTRANGE_HIGH; 1565 else if (flags & IN6P_LOWPORT) 1566 optval = IPV6_PORTRANGE_LOW; 1567 else 1568 optval = 0; 1569 break; 1570 } 1571 1572 case IPV6_PKTINFO: 1573 optval = OPTBIT(IN6P_PKTINFO); 1574 break; 1575 1576 case IPV6_HOPLIMIT: 1577 optval = OPTBIT(IN6P_HOPLIMIT); 1578 break; 1579 1580 case IPV6_HOPOPTS: 1581 optval = OPTBIT(IN6P_HOPOPTS); 1582 break; 1583 1584 case IPV6_DSTOPTS: 1585 optval = OPTBIT(IN6P_DSTOPTS); 1586 break; 1587 1588 case IPV6_RTHDR: 1589 optval = OPTBIT(IN6P_RTHDR); 1590 break; 1591 1592 case IPV6_FAITH: 1593 optval = OPTBIT(IN6P_FAITH); 1594 break; 1595 1596 case IPV6_V6ONLY: 1597 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1598 break; 1599 1600 case IPV6_USE_MIN_MTU: 1601 optval = OPTBIT(IN6P_MINMTU); 1602 break; 1603 } 1604 *mtod(m, int *) = optval; 1605 break; 1606 1607 case IPV6_MULTICAST_IF: 1608 case IPV6_MULTICAST_HOPS: 1609 case IPV6_MULTICAST_LOOP: 1610 case IPV6_JOIN_GROUP: 1611 case IPV6_LEAVE_GROUP: 1612 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1613 break; 1614 1615 #if 0 /* defined(IPSEC) */ 1616 /* XXX: code broken */ 1617 case IPV6_IPSEC_POLICY: 1618 { 1619 caddr_t req = NULL; 1620 size_t len = 0; 1621 1622 if (m) { 1623 req = mtod(m, caddr_t); 1624 len = m->m_len; 1625 } 1626 error = ipsec6_get_policy(in6p, req, len, mp); 1627 break; 1628 } 1629 #endif /* IPSEC */ 1630 1631 default: 1632 error = ENOPROTOOPT; 1633 break; 1634 } 1635 break; 1636 } 1637 } else { 1638 error = EINVAL; 1639 if (op == PRCO_SETOPT && *mp) 1640 (void)m_free(*mp); 1641 } 1642 return (error); 1643 } 1644 1645 int 1646 ip6_raw_ctloutput(op, so, level, optname, mp) 1647 int op; 1648 struct socket *so; 1649 int level, optname; 1650 struct mbuf **mp; 1651 { 1652 int error = 0, optval, optlen; 1653 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1654 struct in6pcb *in6p = sotoin6pcb(so); 1655 struct mbuf *m = *mp; 1656 1657 optlen = m ? m->m_len : 0; 1658 1659 if (level != IPPROTO_IPV6) { 1660 if (op == PRCO_SETOPT && *mp) 1661 (void)m_free(*mp); 1662 return (EINVAL); 1663 } 1664 1665 switch (optname) { 1666 case IPV6_CHECKSUM: 1667 /* 1668 * For ICMPv6 sockets, no modification allowed for checksum 1669 * offset, permit "no change" values to help existing apps. 1670 * 1671 * XXX 2292bis says: "An attempt to set IPV6_CHECKSUM 1672 * for an ICMPv6 socket will fail." 1673 * The current behavior does not meet 2292bis. 1674 */ 1675 switch (op) { 1676 case PRCO_SETOPT: 1677 if (optlen != sizeof(int)) { 1678 error = EINVAL; 1679 break; 1680 } 1681 optval = *mtod(m, int *); 1682 if ((optval % 2) != 0) { 1683 /* the API assumes even offset values */ 1684 error = EINVAL; 1685 } else if (so->so_proto->pr_protocol == 1686 IPPROTO_ICMPV6) { 1687 if (optval != icmp6off) 1688 error = EINVAL; 1689 } else 1690 in6p->in6p_cksum = optval; 1691 break; 1692 1693 case PRCO_GETOPT: 1694 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1695 optval = icmp6off; 1696 else 1697 optval = in6p->in6p_cksum; 1698 1699 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1700 m->m_len = sizeof(int); 1701 *mtod(m, int *) = optval; 1702 break; 1703 1704 default: 1705 error = EINVAL; 1706 break; 1707 } 1708 break; 1709 1710 default: 1711 error = ENOPROTOOPT; 1712 break; 1713 } 1714 1715 if (op == PRCO_SETOPT && m) 1716 (void)m_free(m); 1717 1718 return (error); 1719 } 1720 1721 /* 1722 * Set up IP6 options in pcb for insertion in output packets. 1723 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1724 * with destination address if source routed. 1725 */ 1726 static int 1727 ip6_pcbopts(pktopt, m, so) 1728 struct ip6_pktopts **pktopt; 1729 struct mbuf *m; 1730 struct socket *so; 1731 { 1732 struct ip6_pktopts *opt = *pktopt; 1733 int error = 0; 1734 struct proc *p = curproc; /* XXX */ 1735 int priv = 0; 1736 1737 /* turn off any old options. */ 1738 if (opt) { 1739 if (opt->ip6po_m) 1740 (void)m_free(opt->ip6po_m); 1741 } else 1742 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1743 *pktopt = 0; 1744 1745 if (!m || m->m_len == 0) { 1746 /* 1747 * Only turning off any previous options. 1748 */ 1749 free(opt, M_IP6OPT); 1750 if (m) 1751 (void)m_free(m); 1752 return (0); 1753 } 1754 1755 /* set options specified by user. */ 1756 if (p && !suser(p->p_ucred, &p->p_acflag)) 1757 priv = 1; 1758 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1759 (void)m_free(m); 1760 free(opt, M_IP6OPT); 1761 return (error); 1762 } 1763 *pktopt = opt; 1764 return (0); 1765 } 1766 1767 /* 1768 * Set the IP6 multicast options in response to user setsockopt(). 1769 */ 1770 static int 1771 ip6_setmoptions(optname, im6op, m) 1772 int optname; 1773 struct ip6_moptions **im6op; 1774 struct mbuf *m; 1775 { 1776 int error = 0; 1777 u_int loop, ifindex; 1778 struct ipv6_mreq *mreq; 1779 struct ifnet *ifp; 1780 struct ip6_moptions *im6o = *im6op; 1781 struct route_in6 ro; 1782 struct sockaddr_in6 *dst; 1783 struct in6_multi_mship *imm; 1784 struct proc *p = curproc; /* XXX */ 1785 1786 if (im6o == NULL) { 1787 /* 1788 * No multicast option buffer attached to the pcb; 1789 * allocate one and initialize to default values. 1790 */ 1791 im6o = (struct ip6_moptions *) 1792 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1793 1794 if (im6o == NULL) 1795 return (ENOBUFS); 1796 *im6op = im6o; 1797 im6o->im6o_multicast_ifp = NULL; 1798 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1799 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1800 LIST_INIT(&im6o->im6o_memberships); 1801 } 1802 1803 switch (optname) { 1804 1805 case IPV6_MULTICAST_IF: 1806 /* 1807 * Select the interface for outgoing multicast packets. 1808 */ 1809 if (m == NULL || m->m_len != sizeof(u_int)) { 1810 error = EINVAL; 1811 break; 1812 } 1813 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1814 if (ifindex != 0) { 1815 if (ifindex < 0 || if_indexlim <= ifindex || 1816 !ifindex2ifnet[ifindex]) { 1817 error = ENXIO; /* XXX EINVAL? */ 1818 break; 1819 } 1820 ifp = ifindex2ifnet[ifindex]; 1821 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 1822 error = EADDRNOTAVAIL; 1823 break; 1824 } 1825 } else 1826 ifp = NULL; 1827 im6o->im6o_multicast_ifp = ifp; 1828 break; 1829 1830 case IPV6_MULTICAST_HOPS: 1831 { 1832 /* 1833 * Set the IP6 hoplimit for outgoing multicast packets. 1834 */ 1835 int optval; 1836 if (m == NULL || m->m_len != sizeof(int)) { 1837 error = EINVAL; 1838 break; 1839 } 1840 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1841 if (optval < -1 || optval >= 256) 1842 error = EINVAL; 1843 else if (optval == -1) 1844 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1845 else 1846 im6o->im6o_multicast_hlim = optval; 1847 break; 1848 } 1849 1850 case IPV6_MULTICAST_LOOP: 1851 /* 1852 * Set the loopback flag for outgoing multicast packets. 1853 * Must be zero or one. 1854 */ 1855 if (m == NULL || m->m_len != sizeof(u_int)) { 1856 error = EINVAL; 1857 break; 1858 } 1859 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1860 if (loop > 1) { 1861 error = EINVAL; 1862 break; 1863 } 1864 im6o->im6o_multicast_loop = loop; 1865 break; 1866 1867 case IPV6_JOIN_GROUP: 1868 /* 1869 * Add a multicast group membership. 1870 * Group must be a valid IP6 multicast address. 1871 */ 1872 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1873 error = EINVAL; 1874 break; 1875 } 1876 mreq = mtod(m, struct ipv6_mreq *); 1877 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1878 /* 1879 * We use the unspecified address to specify to accept 1880 * all multicast addresses. Only super user is allowed 1881 * to do this. 1882 */ 1883 if (suser(p->p_ucred, &p->p_acflag)) 1884 { 1885 error = EACCES; 1886 break; 1887 } 1888 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1889 error = EINVAL; 1890 break; 1891 } 1892 1893 /* 1894 * If the interface is specified, validate it. 1895 * If no interface was explicitly specified, choose an 1896 * appropriate one according to the given multicast address. 1897 */ 1898 if (mreq->ipv6mr_interface != 0) { 1899 if (mreq->ipv6mr_interface < 0 || 1900 if_indexlim <= mreq->ipv6mr_interface || 1901 !ifindex2ifnet[mreq->ipv6mr_interface]) { 1902 error = ENXIO; /* XXX EINVAL? */ 1903 break; 1904 } 1905 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1906 } else { 1907 /* 1908 * If the multicast address is in node-local scope, 1909 * the interface should be a loopback interface. 1910 * Otherwise, look up the routing table for the 1911 * address, and choose the outgoing interface. 1912 * XXX: is it a good approach? 1913 */ 1914 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1915 ifp = lo0ifp; 1916 } else { 1917 ro.ro_rt = NULL; 1918 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1919 bzero(dst, sizeof(*dst)); 1920 dst->sin6_len = sizeof(struct sockaddr_in6); 1921 dst->sin6_family = AF_INET6; 1922 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1923 rtalloc((struct route *)&ro); 1924 if (ro.ro_rt == NULL) { 1925 error = EADDRNOTAVAIL; 1926 break; 1927 } 1928 ifp = ro.ro_rt->rt_ifp; 1929 rtfree(ro.ro_rt); 1930 } 1931 } 1932 1933 /* 1934 * See if we found an interface, and confirm that it 1935 * supports multicast 1936 */ 1937 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1938 error = EADDRNOTAVAIL; 1939 break; 1940 } 1941 /* 1942 * Put interface index into the multicast address, 1943 * if the address has link-local scope. 1944 */ 1945 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1946 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1947 htons(ifp->if_index); 1948 } 1949 /* 1950 * See if the membership already exists. 1951 */ 1952 for (imm = im6o->im6o_memberships.lh_first; 1953 imm != NULL; imm = imm->i6mm_chain.le_next) 1954 if (imm->i6mm_maddr->in6m_ifp == ifp && 1955 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1956 &mreq->ipv6mr_multiaddr)) 1957 break; 1958 if (imm != NULL) { 1959 error = EADDRINUSE; 1960 break; 1961 } 1962 /* 1963 * Everything looks good; add a new record to the multicast 1964 * address list for the given interface. 1965 */ 1966 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1967 if (!imm) 1968 break; 1969 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1970 break; 1971 1972 case IPV6_LEAVE_GROUP: 1973 /* 1974 * Drop a multicast group membership. 1975 * Group must be a valid IP6 multicast address. 1976 */ 1977 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1978 error = EINVAL; 1979 break; 1980 } 1981 mreq = mtod(m, struct ipv6_mreq *); 1982 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1983 if (suser(p->p_ucred, &p->p_acflag)) 1984 { 1985 error = EACCES; 1986 break; 1987 } 1988 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1989 error = EINVAL; 1990 break; 1991 } 1992 /* 1993 * If an interface address was specified, get a pointer 1994 * to its ifnet structure. 1995 */ 1996 if (mreq->ipv6mr_interface != 0) { 1997 if (mreq->ipv6mr_interface < 0 || 1998 if_indexlim <= mreq->ipv6mr_interface || 1999 !ifindex2ifnet[mreq->ipv6mr_interface]) { 2000 error = ENXIO; /* XXX EINVAL? */ 2001 break; 2002 } 2003 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2004 } else 2005 ifp = NULL; 2006 /* 2007 * Put interface index into the multicast address, 2008 * if the address has link-local scope. 2009 */ 2010 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2011 mreq->ipv6mr_multiaddr.s6_addr16[1] = 2012 htons(mreq->ipv6mr_interface); 2013 } 2014 /* 2015 * Find the membership in the membership list. 2016 */ 2017 for (imm = im6o->im6o_memberships.lh_first; 2018 imm != NULL; imm = imm->i6mm_chain.le_next) { 2019 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2020 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2021 &mreq->ipv6mr_multiaddr)) 2022 break; 2023 } 2024 if (imm == NULL) { 2025 /* Unable to resolve interface */ 2026 error = EADDRNOTAVAIL; 2027 break; 2028 } 2029 /* 2030 * Give up the multicast address record to which the 2031 * membership points. 2032 */ 2033 LIST_REMOVE(imm, i6mm_chain); 2034 in6_leavegroup(imm); 2035 break; 2036 2037 default: 2038 error = EOPNOTSUPP; 2039 break; 2040 } 2041 2042 /* 2043 * If all options have default values, no need to keep the mbuf. 2044 */ 2045 if (im6o->im6o_multicast_ifp == NULL && 2046 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2047 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2048 im6o->im6o_memberships.lh_first == NULL) { 2049 free(*im6op, M_IPMOPTS); 2050 *im6op = NULL; 2051 } 2052 2053 return (error); 2054 } 2055 2056 /* 2057 * Return the IP6 multicast options in response to user getsockopt(). 2058 */ 2059 static int 2060 ip6_getmoptions(optname, im6o, mp) 2061 int optname; 2062 struct ip6_moptions *im6o; 2063 struct mbuf **mp; 2064 { 2065 u_int *hlim, *loop, *ifindex; 2066 2067 *mp = m_get(M_WAIT, MT_SOOPTS); 2068 2069 switch (optname) { 2070 2071 case IPV6_MULTICAST_IF: 2072 ifindex = mtod(*mp, u_int *); 2073 (*mp)->m_len = sizeof(u_int); 2074 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2075 *ifindex = 0; 2076 else 2077 *ifindex = im6o->im6o_multicast_ifp->if_index; 2078 return (0); 2079 2080 case IPV6_MULTICAST_HOPS: 2081 hlim = mtod(*mp, u_int *); 2082 (*mp)->m_len = sizeof(u_int); 2083 if (im6o == NULL) 2084 *hlim = ip6_defmcasthlim; 2085 else 2086 *hlim = im6o->im6o_multicast_hlim; 2087 return (0); 2088 2089 case IPV6_MULTICAST_LOOP: 2090 loop = mtod(*mp, u_int *); 2091 (*mp)->m_len = sizeof(u_int); 2092 if (im6o == NULL) 2093 *loop = ip6_defmcasthlim; 2094 else 2095 *loop = im6o->im6o_multicast_loop; 2096 return (0); 2097 2098 default: 2099 return (EOPNOTSUPP); 2100 } 2101 } 2102 2103 /* 2104 * Discard the IP6 multicast options. 2105 */ 2106 void 2107 ip6_freemoptions(im6o) 2108 struct ip6_moptions *im6o; 2109 { 2110 struct in6_multi_mship *imm; 2111 2112 if (im6o == NULL) 2113 return; 2114 2115 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2116 LIST_REMOVE(imm, i6mm_chain); 2117 in6_leavegroup(imm); 2118 } 2119 free(im6o, M_IPMOPTS); 2120 } 2121 2122 /* 2123 * Set IPv6 outgoing packet options based on advanced API. 2124 */ 2125 int 2126 ip6_setpktoptions(control, opt, priv) 2127 struct mbuf *control; 2128 struct ip6_pktopts *opt; 2129 int priv; 2130 { 2131 struct cmsghdr *cm = 0; 2132 2133 if (control == 0 || opt == 0) 2134 return (EINVAL); 2135 2136 bzero(opt, sizeof(*opt)); 2137 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2138 2139 /* 2140 * XXX: Currently, we assume all the optional information is stored 2141 * in a single mbuf. 2142 */ 2143 if (control->m_next) 2144 return (EINVAL); 2145 2146 opt->ip6po_m = control; 2147 2148 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2149 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2150 cm = mtod(control, struct cmsghdr *); 2151 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2152 return (EINVAL); 2153 if (cm->cmsg_level != IPPROTO_IPV6) 2154 continue; 2155 2156 switch (cm->cmsg_type) { 2157 case IPV6_PKTINFO: 2158 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2159 return (EINVAL); 2160 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2161 if (opt->ip6po_pktinfo->ipi6_ifindex && 2162 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2163 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2164 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2165 2166 if (opt->ip6po_pktinfo->ipi6_ifindex >= if_indexlim || 2167 opt->ip6po_pktinfo->ipi6_ifindex < 0) 2168 return (ENXIO); 2169 if (opt->ip6po_pktinfo->ipi6_ifindex > 0 && 2170 !ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]) 2171 return (ENXIO); 2172 2173 /* 2174 * Check if the requested source address is indeed a 2175 * unicast address assigned to the node, and can be 2176 * used as the packet's source address. 2177 */ 2178 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2179 struct ifaddr *ia; 2180 struct in6_ifaddr *ia6; 2181 struct sockaddr_in6 sin6; 2182 2183 bzero(&sin6, sizeof(sin6)); 2184 sin6.sin6_len = sizeof(sin6); 2185 sin6.sin6_family = AF_INET6; 2186 sin6.sin6_addr = 2187 opt->ip6po_pktinfo->ipi6_addr; 2188 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2189 if (ia == NULL || 2190 (opt->ip6po_pktinfo->ipi6_ifindex && 2191 (ia->ifa_ifp->if_index != 2192 opt->ip6po_pktinfo->ipi6_ifindex))) { 2193 return (EADDRNOTAVAIL); 2194 } 2195 ia6 = (struct in6_ifaddr *)ia; 2196 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2197 return (EADDRNOTAVAIL); 2198 } 2199 2200 /* 2201 * Check if the requested source address is 2202 * indeed a unicast address assigned to the 2203 * node. 2204 */ 2205 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2206 return (EADDRNOTAVAIL); 2207 } 2208 break; 2209 2210 case IPV6_HOPLIMIT: 2211 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2212 return (EINVAL); 2213 else { 2214 int t; 2215 2216 bcopy(CMSG_DATA(cm), &t, sizeof(t)); 2217 if (t < -1 || t > 255) 2218 return (EINVAL); 2219 opt->ip6po_hlim = t; 2220 } 2221 break; 2222 2223 case IPV6_NEXTHOP: 2224 if (!priv) 2225 return (EPERM); 2226 2227 /* check if cmsg_len is large enough for sa_len */ 2228 if (cm->cmsg_len < sizeof(u_char) || 2229 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2230 return (EINVAL); 2231 2232 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2233 2234 break; 2235 2236 case IPV6_HOPOPTS: 2237 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2238 return (EINVAL); 2239 else { 2240 struct ip6_hbh *t; 2241 2242 t = (struct ip6_hbh *)CMSG_DATA(cm); 2243 if (cm->cmsg_len != 2244 CMSG_LEN((t->ip6h_len + 1) << 3)) 2245 return (EINVAL); 2246 opt->ip6po_hbh = t; 2247 } 2248 break; 2249 2250 case IPV6_DSTOPTS: 2251 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2252 return (EINVAL); 2253 2254 /* 2255 * If there is no routing header yet, the destination 2256 * options header should be put on the 1st part. 2257 * Otherwise, the header should be on the 2nd part. 2258 * (See RFC 2460, section 4.1) 2259 */ 2260 if (opt->ip6po_rthdr == NULL) { 2261 struct ip6_dest *t; 2262 2263 t = (struct ip6_dest *)CMSG_DATA(cm); 2264 if (cm->cmsg_len != 2265 CMSG_LEN((t->ip6d_len + 1) << 3)); 2266 return (EINVAL); 2267 opt->ip6po_dest1 = t; 2268 } 2269 else { 2270 struct ip6_dest *t; 2271 2272 t = (struct ip6_dest *)CMSG_DATA(cm); 2273 if (cm->cmsg_len != 2274 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2275 return (EINVAL); 2276 opt->ip6po_dest2 = t; 2277 } 2278 break; 2279 2280 case IPV6_RTHDR: 2281 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2282 return (EINVAL); 2283 else { 2284 struct ip6_rthdr *t; 2285 2286 t = (struct ip6_rthdr *)CMSG_DATA(cm); 2287 if (cm->cmsg_len != 2288 CMSG_LEN((t->ip6r_len + 1) << 3)) 2289 return (EINVAL); 2290 switch (t->ip6r_type) { 2291 case IPV6_RTHDR_TYPE_0: 2292 if (t->ip6r_segleft == 0) 2293 return (EINVAL); 2294 break; 2295 default: 2296 return (EINVAL); 2297 } 2298 opt->ip6po_rthdr = t; 2299 } 2300 break; 2301 2302 default: 2303 return (ENOPROTOOPT); 2304 } 2305 } 2306 2307 return (0); 2308 } 2309 2310 /* 2311 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2312 * packet to the input queue of a specified interface. Note that this 2313 * calls the output routine of the loopback "driver", but with an interface 2314 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 2315 */ 2316 void 2317 ip6_mloopback(ifp, m, dst) 2318 struct ifnet *ifp; 2319 struct mbuf *m; 2320 struct sockaddr_in6 *dst; 2321 { 2322 struct mbuf *copym; 2323 struct ip6_hdr *ip6; 2324 2325 copym = m_copy(m, 0, M_COPYALL); 2326 if (copym == NULL) 2327 return; 2328 2329 /* 2330 * Make sure to deep-copy IPv6 header portion in case the data 2331 * is in an mbuf cluster, so that we can safely override the IPv6 2332 * header portion later. 2333 */ 2334 if ((copym->m_flags & M_EXT) != 0 || 2335 copym->m_len < sizeof(struct ip6_hdr)) { 2336 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2337 if (copym == NULL) 2338 return; 2339 } 2340 2341 #ifdef DIAGNOSTIC 2342 if (copym->m_len < sizeof(*ip6)) { 2343 m_freem(copym); 2344 return; 2345 } 2346 #endif 2347 2348 ip6 = mtod(copym, struct ip6_hdr *); 2349 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2350 ip6->ip6_src.s6_addr16[1] = 0; 2351 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2352 ip6->ip6_dst.s6_addr16[1] = 0; 2353 2354 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2355 } 2356 2357 /* 2358 * Chop IPv6 header off from the payload. 2359 */ 2360 static int 2361 ip6_splithdr(m, exthdrs) 2362 struct mbuf *m; 2363 struct ip6_exthdrs *exthdrs; 2364 { 2365 struct mbuf *mh; 2366 struct ip6_hdr *ip6; 2367 2368 ip6 = mtod(m, struct ip6_hdr *); 2369 if (m->m_len > sizeof(*ip6)) { 2370 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2371 if (mh == 0) { 2372 m_freem(m); 2373 return ENOBUFS; 2374 } 2375 M_COPY_PKTHDR(mh, m); 2376 MH_ALIGN(mh, sizeof(*ip6)); 2377 m_tag_delete_chain(m, NULL); 2378 m->m_flags &= ~M_PKTHDR; 2379 m->m_len -= sizeof(*ip6); 2380 m->m_data += sizeof(*ip6); 2381 mh->m_next = m; 2382 m = mh; 2383 m->m_len = sizeof(*ip6); 2384 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2385 } 2386 exthdrs->ip6e_ip6 = m; 2387 return 0; 2388 } 2389 2390 /* 2391 * Compute IPv6 extension header length. 2392 */ 2393 int 2394 ip6_optlen(in6p) 2395 struct in6pcb *in6p; 2396 { 2397 int len; 2398 2399 if (!in6p->in6p_outputopts) 2400 return 0; 2401 2402 len = 0; 2403 #define elen(x) \ 2404 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2405 2406 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2407 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2408 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2409 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2410 return len; 2411 #undef elen 2412 } 2413
Indexes created Tue Sep 30 20:09:53 GMT 2025