1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/ip6_output.c,v 1.18 2005/02/08 22:56:19 hsu Exp $ */ 3 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 67 */ 68 69 #include "opt_ip6fw.h" 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 74 #include <sys/param.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/errno.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/pfil.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet6/in6_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet6/nd6.h> 97 98 #ifdef IPSEC 99 #include <netinet6/ipsec.h> 100 #ifdef INET6 101 #include <netinet6/ipsec6.h> 102 #endif 103 #include <netproto/key/key.h> 104 #endif /* IPSEC */ 105 106 #ifdef FAST_IPSEC 107 #include <netproto/ipsec/ipsec.h> 108 #include <netproto/ipsec/ipsec6.h> 109 #include <netproto/ipsec/key.h> 110 #endif /* FAST_IPSEC */ 111 112 #include <net/ip6fw/ip6_fw.h> 113 114 #include <net/net_osdep.h> 115 116 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 117 118 struct ip6_exthdrs { 119 struct mbuf *ip6e_ip6; 120 struct mbuf *ip6e_hbh; 121 struct mbuf *ip6e_dest1; 122 struct mbuf *ip6e_rthdr; 123 struct mbuf *ip6e_dest2; 124 }; 125 126 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 127 struct socket *, struct sockopt *sopt); 128 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 129 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 130 static int ip6_copyexthdr (struct mbuf **, caddr_t, int); 131 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 132 struct ip6_frag **); 133 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 134 static int ip6_splithdr (struct mbuf *, struct ip6_exthdrs *); 135 136 /* 137 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 138 * header (with pri, len, nxt, hlim, src, dst). 139 * This function may modify ver and hlim only. 140 * The mbuf chain containing the packet will be freed. 141 * The mbuf opt, if present, will not be freed. 142 * 143 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 144 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 145 * which is rt_rmx.rmx_mtu. 146 */ 147 int 148 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 149 int flags, struct ip6_moptions *im6o, 150 struct ifnet **ifpp, /* XXX: just for statistics */ 151 struct inpcb *inp) 152 { 153 struct ip6_hdr *ip6, *mhip6; 154 struct ifnet *ifp, *origifp; 155 struct mbuf *m = m0; 156 int hlen, tlen, len, off; 157 struct route_in6 ip6route; 158 struct sockaddr_in6 *dst; 159 int error = 0; 160 struct in6_ifaddr *ia = NULL; 161 u_long mtu; 162 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 163 struct ip6_exthdrs exthdrs; 164 struct in6_addr finaldst; 165 struct route_in6 *ro_pmtu = NULL; 166 int hdrsplit = 0; 167 int needipsec = 0; 168 #ifdef IPSEC 169 int needipsectun = 0; 170 struct secpolicy *sp = NULL; 171 struct socket *so = inp ? inp->inp_socket : NULL; 172 173 ip6 = mtod(m, struct ip6_hdr *); 174 #endif /* IPSEC */ 175 #ifdef FAST_IPSEC 176 int needipsectun = 0; 177 struct secpolicy *sp = NULL; 178 179 ip6 = mtod(m, struct ip6_hdr *); 180 #endif /* FAST_IPSEC */ 181 182 #define MAKE_EXTHDR(hp, mp) \ 183 do { \ 184 if (hp) { \ 185 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 186 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 187 ((eh)->ip6e_len + 1) << 3); \ 188 if (error) \ 189 goto freehdrs; \ 190 } \ 191 } while (0) 192 193 bzero(&exthdrs, sizeof(exthdrs)); 194 195 if (opt) { 196 /* Hop-by-Hop options header */ 197 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 198 /* Destination options header(1st part) */ 199 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 200 /* Routing header */ 201 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 202 /* Destination options header(2nd part) */ 203 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 204 } 205 206 #ifdef IPSEC 207 /* get a security policy for this packet */ 208 if (so == NULL) 209 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 210 else 211 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 212 213 if (sp == NULL) { 214 ipsec6stat.out_inval++; 215 goto freehdrs; 216 } 217 218 error = 0; 219 220 /* check policy */ 221 switch (sp->policy) { 222 case IPSEC_POLICY_DISCARD: 223 /* 224 * This packet is just discarded. 225 */ 226 ipsec6stat.out_polvio++; 227 goto freehdrs; 228 229 case IPSEC_POLICY_BYPASS: 230 case IPSEC_POLICY_NONE: 231 /* no need to do IPsec. */ 232 needipsec = 0; 233 break; 234 235 case IPSEC_POLICY_IPSEC: 236 if (sp->req == NULL) { 237 /* acquire a policy */ 238 error = key_spdacquire(sp); 239 goto freehdrs; 240 } 241 needipsec = 1; 242 break; 243 244 case IPSEC_POLICY_ENTRUST: 245 default: 246 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 247 } 248 #endif /* IPSEC */ 249 #ifdef FAST_IPSEC 250 /* get a security policy for this packet */ 251 if (inp == NULL) 252 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 253 else 254 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 255 256 if (sp == NULL) { 257 newipsecstat.ips_out_inval++; 258 goto freehdrs; 259 } 260 261 error = 0; 262 263 /* check policy */ 264 switch (sp->policy) { 265 case IPSEC_POLICY_DISCARD: 266 /* 267 * This packet is just discarded. 268 */ 269 newipsecstat.ips_out_polvio++; 270 goto freehdrs; 271 272 case IPSEC_POLICY_BYPASS: 273 case IPSEC_POLICY_NONE: 274 /* no need to do IPsec. */ 275 needipsec = 0; 276 break; 277 278 case IPSEC_POLICY_IPSEC: 279 if (sp->req == NULL) { 280 /* acquire a policy */ 281 error = key_spdacquire(sp); 282 goto freehdrs; 283 } 284 needipsec = 1; 285 break; 286 287 case IPSEC_POLICY_ENTRUST: 288 default: 289 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 290 } 291 #endif /* FAST_IPSEC */ 292 293 /* 294 * Calculate the total length of the extension header chain. 295 * Keep the length of the unfragmentable part for fragmentation. 296 */ 297 optlen = 0; 298 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 299 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 300 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 301 unfragpartlen = optlen + sizeof(struct ip6_hdr); 302 /* NOTE: we don't add AH/ESP length here. do that later. */ 303 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 304 305 /* 306 * If we need IPsec, or there is at least one extension header, 307 * separate IP6 header from the payload. 308 */ 309 if ((needipsec || optlen) && !hdrsplit) { 310 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 311 m = NULL; 312 goto freehdrs; 313 } 314 m = exthdrs.ip6e_ip6; 315 hdrsplit++; 316 } 317 318 /* adjust pointer */ 319 ip6 = mtod(m, struct ip6_hdr *); 320 321 /* adjust mbuf packet header length */ 322 m->m_pkthdr.len += optlen; 323 plen = m->m_pkthdr.len - sizeof(*ip6); 324 325 /* If this is a jumbo payload, insert a jumbo payload option. */ 326 if (plen > IPV6_MAXPACKET) { 327 if (!hdrsplit) { 328 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 329 m = NULL; 330 goto freehdrs; 331 } 332 m = exthdrs.ip6e_ip6; 333 hdrsplit++; 334 } 335 /* adjust pointer */ 336 ip6 = mtod(m, struct ip6_hdr *); 337 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 338 goto freehdrs; 339 ip6->ip6_plen = 0; 340 } else 341 ip6->ip6_plen = htons(plen); 342 343 /* 344 * Concatenate headers and fill in next header fields. 345 * Here we have, on "m" 346 * IPv6 payload 347 * and we insert headers accordingly. Finally, we should be getting: 348 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 349 * 350 * during the header composing process, "m" points to IPv6 header. 351 * "mprev" points to an extension header prior to esp. 352 */ 353 { 354 u_char *nexthdrp = &ip6->ip6_nxt; 355 struct mbuf *mprev = m; 356 357 /* 358 * we treat dest2 specially. this makes IPsec processing 359 * much easier. the goal here is to make mprev point the 360 * mbuf prior to dest2. 361 * 362 * result: IPv6 dest2 payload 363 * m and mprev will point to IPv6 header. 364 */ 365 if (exthdrs.ip6e_dest2) { 366 if (!hdrsplit) 367 panic("assumption failed: hdr not split"); 368 exthdrs.ip6e_dest2->m_next = m->m_next; 369 m->m_next = exthdrs.ip6e_dest2; 370 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 371 ip6->ip6_nxt = IPPROTO_DSTOPTS; 372 } 373 374 #define MAKE_CHAIN(m, mp, p, i)\ 375 do {\ 376 if (m) {\ 377 if (!hdrsplit) \ 378 panic("assumption failed: hdr not split"); \ 379 *mtod((m), u_char *) = *(p);\ 380 *(p) = (i);\ 381 p = mtod((m), u_char *);\ 382 (m)->m_next = (mp)->m_next;\ 383 (mp)->m_next = (m);\ 384 (mp) = (m);\ 385 }\ 386 } while (0) 387 /* 388 * result: IPv6 hbh dest1 rthdr dest2 payload 389 * m will point to IPv6 header. mprev will point to the 390 * extension header prior to dest2 (rthdr in the above case). 391 */ 392 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 393 nexthdrp, IPPROTO_HOPOPTS); 394 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 395 nexthdrp, IPPROTO_DSTOPTS); 396 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 397 nexthdrp, IPPROTO_ROUTING); 398 399 #if defined(IPSEC) || defined(FAST_IPSEC) 400 if (!needipsec) 401 goto skip_ipsec2; 402 403 /* 404 * pointers after IPsec headers are not valid any more. 405 * other pointers need a great care too. 406 * (IPsec routines should not mangle mbufs prior to AH/ESP) 407 */ 408 exthdrs.ip6e_dest2 = NULL; 409 410 { 411 struct ip6_rthdr *rh = NULL; 412 int segleft_org = 0; 413 struct ipsec_output_state state; 414 415 if (exthdrs.ip6e_rthdr) { 416 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 417 segleft_org = rh->ip6r_segleft; 418 rh->ip6r_segleft = 0; 419 } 420 421 bzero(&state, sizeof(state)); 422 state.m = m; 423 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 424 &needipsectun); 425 m = state.m; 426 if (error) { 427 /* mbuf is already reclaimed in ipsec6_output_trans. */ 428 m = NULL; 429 switch (error) { 430 case EHOSTUNREACH: 431 case ENETUNREACH: 432 case EMSGSIZE: 433 case ENOBUFS: 434 case ENOMEM: 435 break; 436 default: 437 printf("ip6_output (ipsec): error code %d\n", error); 438 /* fall through */ 439 case ENOENT: 440 /* don't show these error codes to the user */ 441 error = 0; 442 break; 443 } 444 goto bad; 445 } 446 if (exthdrs.ip6e_rthdr) { 447 /* ah6_output doesn't modify mbuf chain */ 448 rh->ip6r_segleft = segleft_org; 449 } 450 } 451 skip_ipsec2:; 452 #endif 453 } 454 455 /* 456 * If there is a routing header, replace destination address field 457 * with the first hop of the routing header. 458 */ 459 if (exthdrs.ip6e_rthdr) { 460 struct ip6_rthdr *rh = 461 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 462 struct ip6_rthdr *)); 463 struct ip6_rthdr0 *rh0; 464 465 finaldst = ip6->ip6_dst; 466 switch (rh->ip6r_type) { 467 case IPV6_RTHDR_TYPE_0: 468 rh0 = (struct ip6_rthdr0 *)rh; 469 ip6->ip6_dst = rh0->ip6r0_addr[0]; 470 bcopy((caddr_t)&rh0->ip6r0_addr[1], 471 (caddr_t)&rh0->ip6r0_addr[0], 472 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 473 ); 474 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 475 break; 476 default: /* is it possible? */ 477 error = EINVAL; 478 goto bad; 479 } 480 } 481 482 /* Source address validation */ 483 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 484 (flags & IPV6_DADOUTPUT) == 0) { 485 error = EOPNOTSUPP; 486 ip6stat.ip6s_badscope++; 487 goto bad; 488 } 489 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 490 error = EOPNOTSUPP; 491 ip6stat.ip6s_badscope++; 492 goto bad; 493 } 494 495 ip6stat.ip6s_localout++; 496 497 /* 498 * Route packet. 499 */ 500 if (ro == 0) { 501 ro = &ip6route; 502 bzero((caddr_t)ro, sizeof(*ro)); 503 } 504 ro_pmtu = ro; 505 if (opt && opt->ip6po_rthdr) 506 ro = &opt->ip6po_route; 507 dst = (struct sockaddr_in6 *)&ro->ro_dst; 508 /* 509 * If there is a cached route, 510 * check that it is to the same destination 511 * and is still up. If not, free it and try again. 512 */ 513 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 514 dst->sin6_family != AF_INET6 || 515 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 516 RTFREE(ro->ro_rt); 517 ro->ro_rt = (struct rtentry *)0; 518 } 519 if (ro->ro_rt == 0) { 520 bzero(dst, sizeof(*dst)); 521 dst->sin6_family = AF_INET6; 522 dst->sin6_len = sizeof(struct sockaddr_in6); 523 dst->sin6_addr = ip6->ip6_dst; 524 } 525 #if defined(IPSEC) || defined(FAST_IPSEC) 526 if (needipsec && needipsectun) { 527 struct ipsec_output_state state; 528 529 /* 530 * All the extension headers will become inaccessible 531 * (since they can be encrypted). 532 * Don't panic, we need no more updates to extension headers 533 * on inner IPv6 packet (since they are now encapsulated). 534 * 535 * IPv6 [ESP|AH] IPv6 [extension headers] payload 536 */ 537 bzero(&exthdrs, sizeof(exthdrs)); 538 exthdrs.ip6e_ip6 = m; 539 540 bzero(&state, sizeof(state)); 541 state.m = m; 542 state.ro = (struct route *)ro; 543 state.dst = (struct sockaddr *)dst; 544 545 error = ipsec6_output_tunnel(&state, sp, flags); 546 547 m = state.m; 548 ro = (struct route_in6 *)state.ro; 549 dst = (struct sockaddr_in6 *)state.dst; 550 if (error) { 551 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 552 m0 = m = NULL; 553 m = NULL; 554 switch (error) { 555 case EHOSTUNREACH: 556 case ENETUNREACH: 557 case EMSGSIZE: 558 case ENOBUFS: 559 case ENOMEM: 560 break; 561 default: 562 printf("ip6_output (ipsec): error code %d\n", error); 563 /* fall through */ 564 case ENOENT: 565 /* don't show these error codes to the user */ 566 error = 0; 567 break; 568 } 569 goto bad; 570 } 571 572 exthdrs.ip6e_ip6 = m; 573 } 574 #endif /* IPSEC */ 575 576 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 577 /* Unicast */ 578 579 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 580 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 581 /* xxx 582 * interface selection comes here 583 * if an interface is specified from an upper layer, 584 * ifp must point it. 585 */ 586 if (ro->ro_rt == 0) { 587 /* 588 * non-bsdi always clone routes, if parent is 589 * PRF_CLONING. 590 */ 591 rtalloc((struct route *)ro); 592 } 593 if (ro->ro_rt == 0) { 594 ip6stat.ip6s_noroute++; 595 error = EHOSTUNREACH; 596 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 597 goto bad; 598 } 599 ia = ifatoia6(ro->ro_rt->rt_ifa); 600 ifp = ro->ro_rt->rt_ifp; 601 ro->ro_rt->rt_use++; 602 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 603 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 604 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 605 606 in6_ifstat_inc(ifp, ifs6_out_request); 607 608 /* 609 * Check if the outgoing interface conflicts with 610 * the interface specified by ifi6_ifindex (if specified). 611 * Note that loopback interface is always okay. 612 * (this may happen when we are sending a packet to one of 613 * our own addresses.) 614 */ 615 if (opt && opt->ip6po_pktinfo 616 && opt->ip6po_pktinfo->ipi6_ifindex) { 617 if (!(ifp->if_flags & IFF_LOOPBACK) 618 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 619 ip6stat.ip6s_noroute++; 620 in6_ifstat_inc(ifp, ifs6_out_discard); 621 error = EHOSTUNREACH; 622 goto bad; 623 } 624 } 625 626 if (opt && opt->ip6po_hlim != -1) 627 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 628 } else { 629 /* Multicast */ 630 struct in6_multi *in6m; 631 632 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 633 634 /* 635 * See if the caller provided any multicast options 636 */ 637 ifp = NULL; 638 if (im6o != NULL) { 639 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 640 if (im6o->im6o_multicast_ifp != NULL) 641 ifp = im6o->im6o_multicast_ifp; 642 } else 643 ip6->ip6_hlim = ip6_defmcasthlim; 644 645 /* 646 * See if the caller provided the outgoing interface 647 * as an ancillary data. 648 * Boundary check for ifindex is assumed to be already done. 649 */ 650 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 651 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 652 653 /* 654 * If the destination is a node-local scope multicast, 655 * the packet should be loop-backed only. 656 */ 657 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 658 /* 659 * If the outgoing interface is already specified, 660 * it should be a loopback interface. 661 */ 662 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 663 ip6stat.ip6s_badscope++; 664 error = ENETUNREACH; /* XXX: better error? */ 665 /* XXX correct ifp? */ 666 in6_ifstat_inc(ifp, ifs6_out_discard); 667 goto bad; 668 } else { 669 ifp = &loif[0]; 670 } 671 } 672 673 if (opt && opt->ip6po_hlim != -1) 674 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 675 676 /* 677 * If caller did not provide an interface lookup a 678 * default in the routing table. This is either a 679 * default for the speicfied group (i.e. a host 680 * route), or a multicast default (a route for the 681 * ``net'' ff00::/8). 682 */ 683 if (ifp == NULL) { 684 if (ro->ro_rt == NULL) { 685 ro->ro_rt = 686 rtpurelookup((struct sockaddr *)&ro->ro_dst); 687 } 688 if (ro->ro_rt == NULL) { 689 ip6stat.ip6s_noroute++; 690 error = EHOSTUNREACH; 691 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 692 goto bad; 693 } 694 ia = ifatoia6(ro->ro_rt->rt_ifa); 695 ifp = ro->ro_rt->rt_ifp; 696 ro->ro_rt->rt_use++; 697 } 698 699 if ((flags & IPV6_FORWARDING) == 0) 700 in6_ifstat_inc(ifp, ifs6_out_request); 701 in6_ifstat_inc(ifp, ifs6_out_mcast); 702 703 /* 704 * Confirm that the outgoing interface supports multicast. 705 */ 706 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 707 ip6stat.ip6s_noroute++; 708 in6_ifstat_inc(ifp, ifs6_out_discard); 709 error = ENETUNREACH; 710 goto bad; 711 } 712 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 713 if (in6m != NULL && 714 (im6o == NULL || im6o->im6o_multicast_loop)) { 715 /* 716 * If we belong to the destination multicast group 717 * on the outgoing interface, and the caller did not 718 * forbid loopback, loop back a copy. 719 */ 720 ip6_mloopback(ifp, m, dst); 721 } else { 722 /* 723 * If we are acting as a multicast router, perform 724 * multicast forwarding as if the packet had just 725 * arrived on the interface to which we are about 726 * to send. The multicast forwarding function 727 * recursively calls this function, using the 728 * IPV6_FORWARDING flag to prevent infinite recursion. 729 * 730 * Multicasts that are looped back by ip6_mloopback(), 731 * above, will be forwarded by the ip6_input() routine, 732 * if necessary. 733 */ 734 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 735 if (ip6_mforward(ip6, ifp, m) != 0) { 736 m_freem(m); 737 goto done; 738 } 739 } 740 } 741 /* 742 * Multicasts with a hoplimit of zero may be looped back, 743 * above, but must not be transmitted on a network. 744 * Also, multicasts addressed to the loopback interface 745 * are not sent -- the above call to ip6_mloopback() will 746 * loop back a copy if this host actually belongs to the 747 * destination group on the loopback interface. 748 */ 749 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 750 m_freem(m); 751 goto done; 752 } 753 } 754 755 /* 756 * Fill the outgoing inteface to tell the upper layer 757 * to increment per-interface statistics. 758 */ 759 if (ifpp) 760 *ifpp = ifp; 761 762 /* 763 * Determine path MTU. 764 */ 765 if (ro_pmtu != ro) { 766 /* The first hop and the final destination may differ. */ 767 struct sockaddr_in6 *sin6_fin = 768 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 769 770 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 771 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 772 &finaldst))) { 773 RTFREE(ro_pmtu->ro_rt); 774 ro_pmtu->ro_rt = (struct rtentry *)0; 775 } 776 if (ro_pmtu->ro_rt == 0) { 777 bzero(sin6_fin, sizeof(*sin6_fin)); 778 sin6_fin->sin6_family = AF_INET6; 779 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 780 sin6_fin->sin6_addr = finaldst; 781 782 rtalloc((struct route *)ro_pmtu); 783 } 784 } 785 if (ro_pmtu->ro_rt != NULL) { 786 u_int32_t ifmtu = ND_IFINFO(ifp)->linkmtu; 787 788 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 789 if (mtu > ifmtu || mtu == 0) { 790 /* 791 * The MTU on the route is larger than the MTU on 792 * the interface! This shouldn't happen, unless the 793 * MTU of the interface has been changed after the 794 * interface was brought up. Change the MTU in the 795 * route to match the interface MTU (as long as the 796 * field isn't locked). 797 * 798 * if MTU on the route is 0, we need to fix the MTU. 799 * this case happens with path MTU discovery timeouts. 800 */ 801 mtu = ifmtu; 802 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 803 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 804 } 805 } else { 806 mtu = ND_IFINFO(ifp)->linkmtu; 807 } 808 809 /* 810 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 811 */ 812 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 813 mtu = IPV6_MMTU; 814 815 /* Fake scoped addresses */ 816 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 817 /* 818 * If source or destination address is a scoped address, and 819 * the packet is going to be sent to a loopback interface, 820 * we should keep the original interface. 821 */ 822 823 /* 824 * XXX: this is a very experimental and temporary solution. 825 * We eventually have sockaddr_in6 and use the sin6_scope_id 826 * field of the structure here. 827 * We rely on the consistency between two scope zone ids 828 * of source and destination, which should already be assured. 829 * Larger scopes than link will be supported in the future. 830 */ 831 origifp = NULL; 832 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 833 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 834 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 835 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 836 /* 837 * XXX: origifp can be NULL even in those two cases above. 838 * For example, if we remove the (only) link-local address 839 * from the loopback interface, and try to send a link-local 840 * address without link-id information. Then the source 841 * address is ::1, and the destination address is the 842 * link-local address with its s6_addr16[1] being zero. 843 * What is worse, if the packet goes to the loopback interface 844 * by a default rejected route, the null pointer would be 845 * passed to looutput, and the kernel would hang. 846 * The following last resort would prevent such disaster. 847 */ 848 if (origifp == NULL) 849 origifp = ifp; 850 } 851 else 852 origifp = ifp; 853 /* 854 * clear embedded scope identifiers if necessary. 855 * in6_clearscope will touch the addresses only when necessary. 856 */ 857 in6_clearscope(&ip6->ip6_src); 858 in6_clearscope(&ip6->ip6_dst); 859 860 /* 861 * Check with the firewall... 862 */ 863 if (ip6_fw_enable && ip6_fw_chk_ptr) { 864 u_short port = 0; 865 m->m_pkthdr.rcvif = NULL; /* XXX */ 866 /* If ipfw says divert, we have to just drop packet */ 867 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 868 m_freem(m); 869 goto done; 870 } 871 if (!m) { 872 error = EACCES; 873 goto done; 874 } 875 } 876 877 /* 878 * If the outgoing packet contains a hop-by-hop options header, 879 * it must be examined and processed even by the source node. 880 * (RFC 2460, section 4.) 881 */ 882 if (exthdrs.ip6e_hbh) { 883 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 884 u_int32_t dummy1; /* XXX unused */ 885 u_int32_t dummy2; /* XXX unused */ 886 887 #ifdef DIAGNOSTIC 888 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 889 panic("ip6e_hbh is not continuous"); 890 #endif 891 /* 892 * XXX: if we have to send an ICMPv6 error to the sender, 893 * we need the M_LOOP flag since icmp6_error() expects 894 * the IPv6 and the hop-by-hop options header are 895 * continuous unless the flag is set. 896 */ 897 m->m_flags |= M_LOOP; 898 m->m_pkthdr.rcvif = ifp; 899 if (ip6_process_hopopts(m, 900 (u_int8_t *)(hbh + 1), 901 ((hbh->ip6h_len + 1) << 3) - 902 sizeof(struct ip6_hbh), 903 &dummy1, &dummy2) < 0) { 904 /* m was already freed at this point */ 905 error = EINVAL;/* better error? */ 906 goto done; 907 } 908 m->m_flags &= ~M_LOOP; /* XXX */ 909 m->m_pkthdr.rcvif = NULL; 910 } 911 912 /* 913 * Run through list of hooks for output packets. 914 */ 915 if (pfil_has_hooks(&inet6_pfil_hook)) { 916 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 917 if (error != 0 || m == NULL) 918 goto done; 919 ip6 = mtod(m, struct ip6_hdr *); 920 } 921 922 /* 923 * Send the packet to the outgoing interface. 924 * If necessary, do IPv6 fragmentation before sending. 925 */ 926 tlen = m->m_pkthdr.len; 927 if (tlen <= mtu 928 #ifdef notyet 929 /* 930 * On any link that cannot convey a 1280-octet packet in one piece, 931 * link-specific fragmentation and reassembly must be provided at 932 * a layer below IPv6. [RFC 2460, sec.5] 933 * Thus if the interface has ability of link-level fragmentation, 934 * we can just send the packet even if the packet size is 935 * larger than the link's MTU. 936 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 937 */ 938 939 || ifp->if_flags & IFF_FRAGMENTABLE 940 #endif 941 ) 942 { 943 /* Record statistics for this interface address. */ 944 if (ia && !(flags & IPV6_FORWARDING)) { 945 ia->ia_ifa.if_opackets++; 946 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 947 } 948 #ifdef IPSEC 949 /* clean ipsec history once it goes out of the node */ 950 ipsec_delaux(m); 951 #endif 952 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 953 goto done; 954 } else if (mtu < IPV6_MMTU) { 955 /* 956 * note that path MTU is never less than IPV6_MMTU 957 * (see icmp6_input). 958 */ 959 error = EMSGSIZE; 960 in6_ifstat_inc(ifp, ifs6_out_fragfail); 961 goto bad; 962 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 963 error = EMSGSIZE; 964 in6_ifstat_inc(ifp, ifs6_out_fragfail); 965 goto bad; 966 } else { 967 struct mbuf **mnext, *m_frgpart; 968 struct ip6_frag *ip6f; 969 u_int32_t id = htonl(ip6_id++); 970 u_char nextproto; 971 972 /* 973 * Too large for the destination or interface; 974 * fragment if possible. 975 * Must be able to put at least 8 bytes per fragment. 976 */ 977 hlen = unfragpartlen; 978 if (mtu > IPV6_MAXPACKET) 979 mtu = IPV6_MAXPACKET; 980 981 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 982 if (len < 8) { 983 error = EMSGSIZE; 984 in6_ifstat_inc(ifp, ifs6_out_fragfail); 985 goto bad; 986 } 987 988 mnext = &m->m_nextpkt; 989 990 /* 991 * Change the next header field of the last header in the 992 * unfragmentable part. 993 */ 994 if (exthdrs.ip6e_rthdr) { 995 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 996 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 997 } else if (exthdrs.ip6e_dest1) { 998 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 999 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1000 } else if (exthdrs.ip6e_hbh) { 1001 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1002 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1003 } else { 1004 nextproto = ip6->ip6_nxt; 1005 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1006 } 1007 1008 /* 1009 * Loop through length of segment after first fragment, 1010 * make new header and copy data of each part and link onto 1011 * chain. 1012 */ 1013 m0 = m; 1014 for (off = hlen; off < tlen; off += len) { 1015 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1016 if (!m) { 1017 error = ENOBUFS; 1018 ip6stat.ip6s_odropped++; 1019 goto sendorfree; 1020 } 1021 m->m_pkthdr.rcvif = NULL; 1022 m->m_flags = m0->m_flags & M_COPYFLAGS; 1023 *mnext = m; 1024 mnext = &m->m_nextpkt; 1025 m->m_data += max_linkhdr; 1026 mhip6 = mtod(m, struct ip6_hdr *); 1027 *mhip6 = *ip6; 1028 m->m_len = sizeof(*mhip6); 1029 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1030 if (error) { 1031 ip6stat.ip6s_odropped++; 1032 goto sendorfree; 1033 } 1034 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1035 if (off + len >= tlen) 1036 len = tlen - off; 1037 else 1038 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1039 mhip6->ip6_plen = htons((u_short)(len + hlen + 1040 sizeof(*ip6f) - 1041 sizeof(struct ip6_hdr))); 1042 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1043 error = ENOBUFS; 1044 ip6stat.ip6s_odropped++; 1045 goto sendorfree; 1046 } 1047 m_cat(m, m_frgpart); 1048 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1049 m->m_pkthdr.rcvif = (struct ifnet *)0; 1050 ip6f->ip6f_reserved = 0; 1051 ip6f->ip6f_ident = id; 1052 ip6f->ip6f_nxt = nextproto; 1053 ip6stat.ip6s_ofragments++; 1054 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1055 } 1056 1057 in6_ifstat_inc(ifp, ifs6_out_fragok); 1058 } 1059 1060 /* 1061 * Remove leading garbages. 1062 */ 1063 sendorfree: 1064 m = m0->m_nextpkt; 1065 m0->m_nextpkt = 0; 1066 m_freem(m0); 1067 for (m0 = m; m; m = m0) { 1068 m0 = m->m_nextpkt; 1069 m->m_nextpkt = 0; 1070 if (error == 0) { 1071 /* Record statistics for this interface address. */ 1072 if (ia) { 1073 ia->ia_ifa.if_opackets++; 1074 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1075 } 1076 #ifdef IPSEC 1077 /* clean ipsec history once it goes out of the node */ 1078 ipsec_delaux(m); 1079 #endif 1080 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1081 } else 1082 m_freem(m); 1083 } 1084 1085 if (error == 0) 1086 ip6stat.ip6s_fragmented++; 1087 1088 done: 1089 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1090 RTFREE(ro->ro_rt); 1091 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1092 RTFREE(ro_pmtu->ro_rt); 1093 } 1094 1095 #ifdef IPSEC 1096 if (sp != NULL) 1097 key_freesp(sp); 1098 #endif /* IPSEC */ 1099 #ifdef FAST_IPSEC 1100 if (sp != NULL) 1101 KEY_FREESP(&sp); 1102 #endif /* FAST_IPSEC */ 1103 1104 return(error); 1105 1106 freehdrs: 1107 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1108 m_freem(exthdrs.ip6e_dest1); 1109 m_freem(exthdrs.ip6e_rthdr); 1110 m_freem(exthdrs.ip6e_dest2); 1111 /* fall through */ 1112 bad: 1113 m_freem(m); 1114 goto done; 1115 } 1116 1117 static int 1118 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1119 { 1120 struct mbuf *m; 1121 1122 if (hlen > MCLBYTES) 1123 return(ENOBUFS); /* XXX */ 1124 1125 MGET(m, MB_DONTWAIT, MT_DATA); 1126 if (!m) 1127 return(ENOBUFS); 1128 1129 if (hlen > MLEN) { 1130 MCLGET(m, MB_DONTWAIT); 1131 if ((m->m_flags & M_EXT) == 0) { 1132 m_free(m); 1133 return(ENOBUFS); 1134 } 1135 } 1136 m->m_len = hlen; 1137 if (hdr) 1138 bcopy(hdr, mtod(m, caddr_t), hlen); 1139 1140 *mp = m; 1141 return(0); 1142 } 1143 1144 /* 1145 * Insert jumbo payload option. 1146 */ 1147 static int 1148 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1149 { 1150 struct mbuf *mopt; 1151 u_char *optbuf; 1152 u_int32_t v; 1153 1154 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1155 1156 /* 1157 * If there is no hop-by-hop options header, allocate new one. 1158 * If there is one but it doesn't have enough space to store the 1159 * jumbo payload option, allocate a cluster to store the whole options. 1160 * Otherwise, use it to store the options. 1161 */ 1162 if (exthdrs->ip6e_hbh == 0) { 1163 MGET(mopt, MB_DONTWAIT, MT_DATA); 1164 if (mopt == 0) 1165 return(ENOBUFS); 1166 mopt->m_len = JUMBOOPTLEN; 1167 optbuf = mtod(mopt, u_char *); 1168 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1169 exthdrs->ip6e_hbh = mopt; 1170 } else { 1171 struct ip6_hbh *hbh; 1172 1173 mopt = exthdrs->ip6e_hbh; 1174 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1175 /* 1176 * XXX assumption: 1177 * - exthdrs->ip6e_hbh is not referenced from places 1178 * other than exthdrs. 1179 * - exthdrs->ip6e_hbh is not an mbuf chain. 1180 */ 1181 int oldoptlen = mopt->m_len; 1182 struct mbuf *n; 1183 1184 /* 1185 * XXX: give up if the whole (new) hbh header does 1186 * not fit even in an mbuf cluster. 1187 */ 1188 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1189 return(ENOBUFS); 1190 1191 /* 1192 * As a consequence, we must always prepare a cluster 1193 * at this point. 1194 */ 1195 MGET(n, MB_DONTWAIT, MT_DATA); 1196 if (n) { 1197 MCLGET(n, MB_DONTWAIT); 1198 if ((n->m_flags & M_EXT) == 0) { 1199 m_freem(n); 1200 n = NULL; 1201 } 1202 } 1203 if (!n) 1204 return(ENOBUFS); 1205 n->m_len = oldoptlen + JUMBOOPTLEN; 1206 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1207 oldoptlen); 1208 optbuf = mtod(n, caddr_t) + oldoptlen; 1209 m_freem(mopt); 1210 mopt = exthdrs->ip6e_hbh = n; 1211 } else { 1212 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1213 mopt->m_len += JUMBOOPTLEN; 1214 } 1215 optbuf[0] = IP6OPT_PADN; 1216 optbuf[1] = 1; 1217 1218 /* 1219 * Adjust the header length according to the pad and 1220 * the jumbo payload option. 1221 */ 1222 hbh = mtod(mopt, struct ip6_hbh *); 1223 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1224 } 1225 1226 /* fill in the option. */ 1227 optbuf[2] = IP6OPT_JUMBO; 1228 optbuf[3] = 4; 1229 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1230 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1231 1232 /* finally, adjust the packet header length */ 1233 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1234 1235 return(0); 1236 #undef JUMBOOPTLEN 1237 } 1238 1239 /* 1240 * Insert fragment header and copy unfragmentable header portions. 1241 */ 1242 static int 1243 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1244 struct ip6_frag **frghdrp) 1245 { 1246 struct mbuf *n, *mlast; 1247 1248 if (hlen > sizeof(struct ip6_hdr)) { 1249 n = m_copym(m0, sizeof(struct ip6_hdr), 1250 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1251 if (n == 0) 1252 return(ENOBUFS); 1253 m->m_next = n; 1254 } else 1255 n = m; 1256 1257 /* Search for the last mbuf of unfragmentable part. */ 1258 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1259 ; 1260 1261 if ((mlast->m_flags & M_EXT) == 0 && 1262 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1263 /* use the trailing space of the last mbuf for the fragment hdr */ 1264 *frghdrp = 1265 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1266 mlast->m_len += sizeof(struct ip6_frag); 1267 m->m_pkthdr.len += sizeof(struct ip6_frag); 1268 } else { 1269 /* allocate a new mbuf for the fragment header */ 1270 struct mbuf *mfrg; 1271 1272 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1273 if (mfrg == 0) 1274 return(ENOBUFS); 1275 mfrg->m_len = sizeof(struct ip6_frag); 1276 *frghdrp = mtod(mfrg, struct ip6_frag *); 1277 mlast->m_next = mfrg; 1278 } 1279 1280 return(0); 1281 } 1282 1283 /* 1284 * IP6 socket option processing. 1285 */ 1286 int 1287 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1288 { 1289 int privileged; 1290 struct inpcb *in6p = so->so_pcb; 1291 int error, optval; 1292 int level, op, optname; 1293 int optlen; 1294 struct thread *td; 1295 1296 if (sopt) { 1297 level = sopt->sopt_level; 1298 op = sopt->sopt_dir; 1299 optname = sopt->sopt_name; 1300 optlen = sopt->sopt_valsize; 1301 td = sopt->sopt_td; 1302 } else { 1303 panic("ip6_ctloutput: arg soopt is NULL"); 1304 /* NOT REACHED */ 1305 td = NULL; 1306 } 1307 error = optval = 0; 1308 1309 privileged = (td == NULL || suser(td)) ? 0 : 1; 1310 1311 if (level == IPPROTO_IPV6) { 1312 switch (op) { 1313 1314 case SOPT_SET: 1315 switch (optname) { 1316 case IPV6_PKTOPTIONS: 1317 { 1318 struct mbuf *m; 1319 1320 error = soopt_getm(sopt, &m); /* XXX */ 1321 if (error != NULL) 1322 break; 1323 error = soopt_mcopyin(sopt, m); /* XXX */ 1324 if (error != NULL) 1325 break; 1326 error = ip6_pcbopts(&in6p->in6p_outputopts, 1327 m, so, sopt); 1328 m_freem(m); /* XXX */ 1329 break; 1330 } 1331 1332 /* 1333 * Use of some Hop-by-Hop options or some 1334 * Destination options, might require special 1335 * privilege. That is, normal applications 1336 * (without special privilege) might be forbidden 1337 * from setting certain options in outgoing packets, 1338 * and might never see certain options in received 1339 * packets. [RFC 2292 Section 6] 1340 * KAME specific note: 1341 * KAME prevents non-privileged users from sending or 1342 * receiving ANY hbh/dst options in order to avoid 1343 * overhead of parsing options in the kernel. 1344 */ 1345 case IPV6_UNICAST_HOPS: 1346 case IPV6_CHECKSUM: 1347 case IPV6_FAITH: 1348 1349 case IPV6_V6ONLY: 1350 if (optlen != sizeof(int)) { 1351 error = EINVAL; 1352 break; 1353 } 1354 error = sooptcopyin(sopt, &optval, 1355 sizeof optval, sizeof optval); 1356 if (error) 1357 break; 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 if ((in6p->in6p_vflag & 1368 INP_IPV4) != 0) 1369 in6p->inp_ip_ttl = optval; 1370 } 1371 break; 1372 #define OPTSET(bit) \ 1373 do { \ 1374 if (optval) \ 1375 in6p->in6p_flags |= (bit); \ 1376 else \ 1377 in6p->in6p_flags &= ~(bit); \ 1378 } while (0) 1379 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1380 1381 case IPV6_CHECKSUM: 1382 in6p->in6p_cksum = optval; 1383 break; 1384 1385 case IPV6_FAITH: 1386 OPTSET(IN6P_FAITH); 1387 break; 1388 1389 case IPV6_V6ONLY: 1390 /* 1391 * make setsockopt(IPV6_V6ONLY) 1392 * available only prior to bind(2). 1393 * see ipng mailing list, Jun 22 2001. 1394 */ 1395 if (in6p->in6p_lport || 1396 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1397 { 1398 error = EINVAL; 1399 break; 1400 } 1401 OPTSET(IN6P_IPV6_V6ONLY); 1402 if (optval) 1403 in6p->in6p_vflag &= ~INP_IPV4; 1404 else 1405 in6p->in6p_vflag |= INP_IPV4; 1406 break; 1407 } 1408 break; 1409 1410 case IPV6_PKTINFO: 1411 case IPV6_HOPLIMIT: 1412 case IPV6_HOPOPTS: 1413 case IPV6_DSTOPTS: 1414 case IPV6_RTHDR: 1415 /* RFC 2292 */ 1416 if (optlen != sizeof(int)) { 1417 error = EINVAL; 1418 break; 1419 } 1420 error = sooptcopyin(sopt, &optval, 1421 sizeof optval, sizeof optval); 1422 if (error) 1423 break; 1424 switch (optname) { 1425 case IPV6_PKTINFO: 1426 OPTSET(IN6P_PKTINFO); 1427 break; 1428 case IPV6_HOPLIMIT: 1429 OPTSET(IN6P_HOPLIMIT); 1430 break; 1431 case IPV6_HOPOPTS: 1432 /* 1433 * Check super-user privilege. 1434 * See comments for IPV6_RECVHOPOPTS. 1435 */ 1436 if (!privileged) 1437 return(EPERM); 1438 OPTSET(IN6P_HOPOPTS); 1439 break; 1440 case IPV6_DSTOPTS: 1441 if (!privileged) 1442 return(EPERM); 1443 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1444 break; 1445 case IPV6_RTHDR: 1446 OPTSET(IN6P_RTHDR); 1447 break; 1448 } 1449 break; 1450 #undef OPTSET 1451 1452 case IPV6_MULTICAST_IF: 1453 case IPV6_MULTICAST_HOPS: 1454 case IPV6_MULTICAST_LOOP: 1455 case IPV6_JOIN_GROUP: 1456 case IPV6_LEAVE_GROUP: 1457 { 1458 struct mbuf *m; 1459 if (sopt->sopt_valsize > MLEN) { 1460 error = EMSGSIZE; 1461 break; 1462 } 1463 /* XXX */ 1464 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1465 if (m == 0) { 1466 error = ENOBUFS; 1467 break; 1468 } 1469 m->m_len = sopt->sopt_valsize; 1470 error = sooptcopyin(sopt, mtod(m, char *), 1471 m->m_len, m->m_len); 1472 error = ip6_setmoptions(sopt->sopt_name, 1473 &in6p->in6p_moptions, 1474 m); 1475 (void)m_free(m); 1476 } 1477 break; 1478 1479 case IPV6_PORTRANGE: 1480 error = sooptcopyin(sopt, &optval, 1481 sizeof optval, sizeof optval); 1482 if (error) 1483 break; 1484 1485 switch (optval) { 1486 case IPV6_PORTRANGE_DEFAULT: 1487 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1488 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1489 break; 1490 1491 case IPV6_PORTRANGE_HIGH: 1492 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1493 in6p->in6p_flags |= IN6P_HIGHPORT; 1494 break; 1495 1496 case IPV6_PORTRANGE_LOW: 1497 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1498 in6p->in6p_flags |= IN6P_LOWPORT; 1499 break; 1500 1501 default: 1502 error = EINVAL; 1503 break; 1504 } 1505 break; 1506 1507 #if defined(IPSEC) || defined(FAST_IPSEC) 1508 case IPV6_IPSEC_POLICY: 1509 { 1510 caddr_t req = NULL; 1511 size_t len = 0; 1512 struct mbuf *m; 1513 1514 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1515 break; 1516 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1517 break; 1518 if (m) { 1519 req = mtod(m, caddr_t); 1520 len = m->m_len; 1521 } 1522 error = ipsec6_set_policy(in6p, optname, req, 1523 len, privileged); 1524 m_freem(m); 1525 } 1526 break; 1527 #endif /* KAME IPSEC */ 1528 1529 case IPV6_FW_ADD: 1530 case IPV6_FW_DEL: 1531 case IPV6_FW_FLUSH: 1532 case IPV6_FW_ZERO: 1533 { 1534 struct mbuf *m; 1535 struct mbuf **mp = &m; 1536 1537 if (ip6_fw_ctl_ptr == NULL) 1538 return EINVAL; 1539 /* XXX */ 1540 if ((error = soopt_getm(sopt, &m)) != 0) 1541 break; 1542 /* XXX */ 1543 if ((error = soopt_mcopyin(sopt, m)) != 0) 1544 break; 1545 error = (*ip6_fw_ctl_ptr)(optname, mp); 1546 m = *mp; 1547 } 1548 break; 1549 1550 default: 1551 error = ENOPROTOOPT; 1552 break; 1553 } 1554 break; 1555 1556 case SOPT_GET: 1557 switch (optname) { 1558 1559 case IPV6_PKTOPTIONS: 1560 if (in6p->in6p_options) { 1561 struct mbuf *m; 1562 m = m_copym(in6p->in6p_options, 1563 0, M_COPYALL, MB_WAIT); 1564 error = soopt_mcopyout(sopt, m); 1565 if (error == 0) 1566 m_freem(m); 1567 } else 1568 sopt->sopt_valsize = 0; 1569 break; 1570 1571 case IPV6_UNICAST_HOPS: 1572 case IPV6_CHECKSUM: 1573 1574 case IPV6_FAITH: 1575 case IPV6_V6ONLY: 1576 case IPV6_PORTRANGE: 1577 switch (optname) { 1578 1579 case IPV6_UNICAST_HOPS: 1580 optval = in6p->in6p_hops; 1581 break; 1582 1583 case IPV6_CHECKSUM: 1584 optval = in6p->in6p_cksum; 1585 break; 1586 1587 case IPV6_FAITH: 1588 optval = OPTBIT(IN6P_FAITH); 1589 break; 1590 1591 case IPV6_V6ONLY: 1592 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1593 break; 1594 1595 case IPV6_PORTRANGE: 1596 { 1597 int flags; 1598 flags = in6p->in6p_flags; 1599 if (flags & IN6P_HIGHPORT) 1600 optval = IPV6_PORTRANGE_HIGH; 1601 else if (flags & IN6P_LOWPORT) 1602 optval = IPV6_PORTRANGE_LOW; 1603 else 1604 optval = 0; 1605 break; 1606 } 1607 } 1608 error = sooptcopyout(sopt, &optval, 1609 sizeof optval); 1610 break; 1611 1612 case IPV6_PKTINFO: 1613 case IPV6_HOPLIMIT: 1614 case IPV6_HOPOPTS: 1615 case IPV6_RTHDR: 1616 case IPV6_DSTOPTS: 1617 if (optname == IPV6_HOPOPTS || 1618 optname == IPV6_DSTOPTS || 1619 !privileged) 1620 return(EPERM); 1621 switch (optname) { 1622 case IPV6_PKTINFO: 1623 optval = OPTBIT(IN6P_PKTINFO); 1624 break; 1625 case IPV6_HOPLIMIT: 1626 optval = OPTBIT(IN6P_HOPLIMIT); 1627 break; 1628 case IPV6_HOPOPTS: 1629 if (!privileged) 1630 return(EPERM); 1631 optval = OPTBIT(IN6P_HOPOPTS); 1632 break; 1633 case IPV6_RTHDR: 1634 optval = OPTBIT(IN6P_RTHDR); 1635 break; 1636 case IPV6_DSTOPTS: 1637 if (!privileged) 1638 return(EPERM); 1639 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1640 break; 1641 } 1642 error = sooptcopyout(sopt, &optval, 1643 sizeof optval); 1644 break; 1645 1646 case IPV6_MULTICAST_IF: 1647 case IPV6_MULTICAST_HOPS: 1648 case IPV6_MULTICAST_LOOP: 1649 case IPV6_JOIN_GROUP: 1650 case IPV6_LEAVE_GROUP: 1651 { 1652 struct mbuf *m; 1653 error = ip6_getmoptions(sopt->sopt_name, 1654 in6p->in6p_moptions, &m); 1655 if (error == 0) 1656 error = sooptcopyout(sopt, 1657 mtod(m, char *), m->m_len); 1658 m_freem(m); 1659 } 1660 break; 1661 1662 #if defined(IPSEC) || defined(FAST_IPSEC) 1663 case IPV6_IPSEC_POLICY: 1664 { 1665 caddr_t req = NULL; 1666 size_t len = 0; 1667 struct mbuf *m = NULL; 1668 struct mbuf **mp = &m; 1669 1670 error = soopt_getm(sopt, &m); /* XXX */ 1671 if (error != NULL) 1672 break; 1673 error = soopt_mcopyin(sopt, m); /* XXX */ 1674 if (error != NULL) 1675 break; 1676 if (m) { 1677 req = mtod(m, caddr_t); 1678 len = m->m_len; 1679 } 1680 error = ipsec6_get_policy(in6p, req, len, mp); 1681 if (error == 0) 1682 error = soopt_mcopyout(sopt, m); /*XXX*/ 1683 if (error == 0 && m) 1684 m_freem(m); 1685 break; 1686 } 1687 #endif /* KAME IPSEC */ 1688 1689 case IPV6_FW_GET: 1690 { 1691 struct mbuf *m; 1692 struct mbuf **mp = &m; 1693 1694 if (ip6_fw_ctl_ptr == NULL) 1695 { 1696 return EINVAL; 1697 } 1698 error = (*ip6_fw_ctl_ptr)(optname, mp); 1699 if (error == 0) 1700 error = soopt_mcopyout(sopt, m); /* XXX */ 1701 if (error == 0 && m) 1702 m_freem(m); 1703 } 1704 break; 1705 1706 default: 1707 error = ENOPROTOOPT; 1708 break; 1709 } 1710 break; 1711 } 1712 } else { 1713 error = EINVAL; 1714 } 1715 return(error); 1716 } 1717 1718 /* 1719 * Set up IP6 options in pcb for insertion in output packets or 1720 * specifying behavior of outgoing packets. 1721 */ 1722 static int 1723 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, struct socket *so, 1724 struct sockopt *sopt) 1725 { 1726 struct ip6_pktopts *opt = *pktopt; 1727 int error = 0; 1728 struct thread *td = sopt->sopt_td; 1729 int priv = 0; 1730 1731 /* turn off any old options. */ 1732 if (opt) { 1733 #ifdef DIAGNOSTIC 1734 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1735 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1736 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1737 printf("ip6_pcbopts: all specified options are cleared.\n"); 1738 #endif 1739 ip6_clearpktopts(opt, 1, -1); 1740 } else 1741 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1742 *pktopt = NULL; 1743 1744 if (!m || m->m_len == 0) { 1745 /* 1746 * Only turning off any previous options, regardless of 1747 * whether the opt is just created or given. 1748 */ 1749 free(opt, M_IP6OPT); 1750 return(0); 1751 } 1752 1753 /* set options specified by user. */ 1754 if (suser(td) == 0) 1755 priv = 1; 1756 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1757 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1758 free(opt, M_IP6OPT); 1759 return(error); 1760 } 1761 *pktopt = opt; 1762 return(0); 1763 } 1764 1765 /* 1766 * initialize ip6_pktopts. beware that there are non-zero default values in 1767 * the struct. 1768 */ 1769 void 1770 init_ip6pktopts(struct ip6_pktopts *opt) 1771 { 1772 1773 bzero(opt, sizeof(*opt)); 1774 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1775 } 1776 1777 void 1778 ip6_clearpktopts(struct ip6_pktopts *pktopt, int needfree, int optname) 1779 { 1780 if (pktopt == NULL) 1781 return; 1782 1783 if (optname == -1) { 1784 if (needfree && pktopt->ip6po_pktinfo) 1785 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1786 pktopt->ip6po_pktinfo = NULL; 1787 } 1788 if (optname == -1) 1789 pktopt->ip6po_hlim = -1; 1790 if (optname == -1) { 1791 if (needfree && pktopt->ip6po_nexthop) 1792 free(pktopt->ip6po_nexthop, M_IP6OPT); 1793 pktopt->ip6po_nexthop = NULL; 1794 } 1795 if (optname == -1) { 1796 if (needfree && pktopt->ip6po_hbh) 1797 free(pktopt->ip6po_hbh, M_IP6OPT); 1798 pktopt->ip6po_hbh = NULL; 1799 } 1800 if (optname == -1) { 1801 if (needfree && pktopt->ip6po_dest1) 1802 free(pktopt->ip6po_dest1, M_IP6OPT); 1803 pktopt->ip6po_dest1 = NULL; 1804 } 1805 if (optname == -1) { 1806 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1807 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1808 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1809 if (pktopt->ip6po_route.ro_rt) { 1810 RTFREE(pktopt->ip6po_route.ro_rt); 1811 pktopt->ip6po_route.ro_rt = NULL; 1812 } 1813 } 1814 if (optname == -1) { 1815 if (needfree && pktopt->ip6po_dest2) 1816 free(pktopt->ip6po_dest2, M_IP6OPT); 1817 pktopt->ip6po_dest2 = NULL; 1818 } 1819 } 1820 1821 #define PKTOPT_EXTHDRCPY(type) \ 1822 do {\ 1823 if (src->type) {\ 1824 int hlen =\ 1825 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1826 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1827 if (dst->type == NULL && canwait == M_NOWAIT)\ 1828 goto bad;\ 1829 bcopy(src->type, dst->type, hlen);\ 1830 }\ 1831 } while (0) 1832 1833 struct ip6_pktopts * 1834 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 1835 { 1836 struct ip6_pktopts *dst; 1837 1838 if (src == NULL) { 1839 printf("ip6_clearpktopts: invalid argument\n"); 1840 return(NULL); 1841 } 1842 1843 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1844 if (dst == NULL && canwait == M_NOWAIT) 1845 return (NULL); 1846 bzero(dst, sizeof(*dst)); 1847 1848 dst->ip6po_hlim = src->ip6po_hlim; 1849 if (src->ip6po_pktinfo) { 1850 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1851 M_IP6OPT, canwait); 1852 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1853 goto bad; 1854 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1855 } 1856 if (src->ip6po_nexthop) { 1857 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1858 M_IP6OPT, canwait); 1859 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1860 goto bad; 1861 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1862 src->ip6po_nexthop->sa_len); 1863 } 1864 PKTOPT_EXTHDRCPY(ip6po_hbh); 1865 PKTOPT_EXTHDRCPY(ip6po_dest1); 1866 PKTOPT_EXTHDRCPY(ip6po_dest2); 1867 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1868 return(dst); 1869 1870 bad: 1871 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1872 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1873 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1874 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1875 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1876 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1877 free(dst, M_IP6OPT); 1878 return(NULL); 1879 } 1880 #undef PKTOPT_EXTHDRCPY 1881 1882 void 1883 ip6_freepcbopts(struct ip6_pktopts *pktopt) 1884 { 1885 if (pktopt == NULL) 1886 return; 1887 1888 ip6_clearpktopts(pktopt, 1, -1); 1889 1890 free(pktopt, M_IP6OPT); 1891 } 1892 1893 /* 1894 * Set the IP6 multicast options in response to user setsockopt(). 1895 */ 1896 static int 1897 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 1898 { 1899 int error = 0; 1900 u_int loop, ifindex; 1901 struct ipv6_mreq *mreq; 1902 struct ifnet *ifp; 1903 struct ip6_moptions *im6o = *im6op; 1904 struct route_in6 ro; 1905 struct sockaddr_in6 *dst; 1906 struct in6_multi_mship *imm; 1907 struct thread *td = curthread; /* XXX */ 1908 1909 if (im6o == NULL) { 1910 /* 1911 * No multicast option buffer attached to the pcb; 1912 * allocate one and initialize to default values. 1913 */ 1914 im6o = (struct ip6_moptions *) 1915 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1916 1917 if (im6o == NULL) 1918 return(ENOBUFS); 1919 *im6op = im6o; 1920 im6o->im6o_multicast_ifp = NULL; 1921 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1922 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1923 LIST_INIT(&im6o->im6o_memberships); 1924 } 1925 1926 switch (optname) { 1927 1928 case IPV6_MULTICAST_IF: 1929 /* 1930 * Select the interface for outgoing multicast packets. 1931 */ 1932 if (m == NULL || m->m_len != sizeof(u_int)) { 1933 error = EINVAL; 1934 break; 1935 } 1936 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1937 if (ifindex < 0 || if_index < ifindex) { 1938 error = ENXIO; /* XXX EINVAL? */ 1939 break; 1940 } 1941 ifp = ifindex2ifnet[ifindex]; 1942 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1943 error = EADDRNOTAVAIL; 1944 break; 1945 } 1946 im6o->im6o_multicast_ifp = ifp; 1947 break; 1948 1949 case IPV6_MULTICAST_HOPS: 1950 { 1951 /* 1952 * Set the IP6 hoplimit for outgoing multicast packets. 1953 */ 1954 int optval; 1955 if (m == NULL || m->m_len != sizeof(int)) { 1956 error = EINVAL; 1957 break; 1958 } 1959 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1960 if (optval < -1 || optval >= 256) 1961 error = EINVAL; 1962 else if (optval == -1) 1963 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1964 else 1965 im6o->im6o_multicast_hlim = optval; 1966 break; 1967 } 1968 1969 case IPV6_MULTICAST_LOOP: 1970 /* 1971 * Set the loopback flag for outgoing multicast packets. 1972 * Must be zero or one. 1973 */ 1974 if (m == NULL || m->m_len != sizeof(u_int)) { 1975 error = EINVAL; 1976 break; 1977 } 1978 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1979 if (loop > 1) { 1980 error = EINVAL; 1981 break; 1982 } 1983 im6o->im6o_multicast_loop = loop; 1984 break; 1985 1986 case IPV6_JOIN_GROUP: 1987 /* 1988 * Add a multicast group membership. 1989 * Group must be a valid IP6 multicast address. 1990 */ 1991 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1992 error = EINVAL; 1993 break; 1994 } 1995 mreq = mtod(m, struct ipv6_mreq *); 1996 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1997 /* 1998 * We use the unspecified address to specify to accept 1999 * all multicast addresses. Only super user is allowed 2000 * to do this. 2001 */ 2002 if (suser(td)) 2003 { 2004 error = EACCES; 2005 break; 2006 } 2007 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2008 error = EINVAL; 2009 break; 2010 } 2011 2012 /* 2013 * If the interface is specified, validate it. 2014 */ 2015 if (mreq->ipv6mr_interface < 0 2016 || if_index < mreq->ipv6mr_interface) { 2017 error = ENXIO; /* XXX EINVAL? */ 2018 break; 2019 } 2020 /* 2021 * If no interface was explicitly specified, choose an 2022 * appropriate one according to the given multicast address. 2023 */ 2024 if (mreq->ipv6mr_interface == 0) { 2025 /* 2026 * If the multicast address is in node-local scope, 2027 * the interface should be a loopback interface. 2028 * Otherwise, look up the routing table for the 2029 * address, and choose the outgoing interface. 2030 * XXX: is it a good approach? 2031 */ 2032 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2033 ifp = &loif[0]; 2034 } else { 2035 ro.ro_rt = NULL; 2036 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2037 bzero(dst, sizeof(*dst)); 2038 dst->sin6_len = sizeof(struct sockaddr_in6); 2039 dst->sin6_family = AF_INET6; 2040 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2041 rtalloc((struct route *)&ro); 2042 if (ro.ro_rt == NULL) { 2043 error = EADDRNOTAVAIL; 2044 break; 2045 } 2046 ifp = ro.ro_rt->rt_ifp; 2047 rtfree(ro.ro_rt); 2048 } 2049 } else 2050 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2051 2052 /* 2053 * See if we found an interface, and confirm that it 2054 * supports multicast 2055 */ 2056 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2057 error = EADDRNOTAVAIL; 2058 break; 2059 } 2060 /* 2061 * Put interface index into the multicast address, 2062 * if the address has link-local scope. 2063 */ 2064 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2065 mreq->ipv6mr_multiaddr.s6_addr16[1] 2066 = htons(mreq->ipv6mr_interface); 2067 } 2068 /* 2069 * See if the membership already exists. 2070 */ 2071 for (imm = im6o->im6o_memberships.lh_first; 2072 imm != NULL; imm = imm->i6mm_chain.le_next) 2073 if (imm->i6mm_maddr->in6m_ifp == ifp && 2074 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2075 &mreq->ipv6mr_multiaddr)) 2076 break; 2077 if (imm != NULL) { 2078 error = EADDRINUSE; 2079 break; 2080 } 2081 /* 2082 * Everything looks good; add a new record to the multicast 2083 * address list for the given interface. 2084 */ 2085 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2086 if (imm == NULL) { 2087 error = ENOBUFS; 2088 break; 2089 } 2090 if ((imm->i6mm_maddr = 2091 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2092 free(imm, M_IPMADDR); 2093 break; 2094 } 2095 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2096 break; 2097 2098 case IPV6_LEAVE_GROUP: 2099 /* 2100 * Drop a multicast group membership. 2101 * Group must be a valid IP6 multicast address. 2102 */ 2103 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2104 error = EINVAL; 2105 break; 2106 } 2107 mreq = mtod(m, struct ipv6_mreq *); 2108 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2109 if (suser(td)) { 2110 error = EACCES; 2111 break; 2112 } 2113 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2114 error = EINVAL; 2115 break; 2116 } 2117 /* 2118 * If an interface address was specified, get a pointer 2119 * to its ifnet structure. 2120 */ 2121 if (mreq->ipv6mr_interface < 0 2122 || if_index < mreq->ipv6mr_interface) { 2123 error = ENXIO; /* XXX EINVAL? */ 2124 break; 2125 } 2126 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2127 /* 2128 * Put interface index into the multicast address, 2129 * if the address has link-local scope. 2130 */ 2131 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2132 mreq->ipv6mr_multiaddr.s6_addr16[1] 2133 = htons(mreq->ipv6mr_interface); 2134 } 2135 /* 2136 * Find the membership in the membership list. 2137 */ 2138 for (imm = im6o->im6o_memberships.lh_first; 2139 imm != NULL; imm = imm->i6mm_chain.le_next) { 2140 if ((ifp == NULL || 2141 imm->i6mm_maddr->in6m_ifp == ifp) && 2142 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2143 &mreq->ipv6mr_multiaddr)) 2144 break; 2145 } 2146 if (imm == NULL) { 2147 /* Unable to resolve interface */ 2148 error = EADDRNOTAVAIL; 2149 break; 2150 } 2151 /* 2152 * Give up the multicast address record to which the 2153 * membership points. 2154 */ 2155 LIST_REMOVE(imm, i6mm_chain); 2156 in6_delmulti(imm->i6mm_maddr); 2157 free(imm, M_IPMADDR); 2158 break; 2159 2160 default: 2161 error = EOPNOTSUPP; 2162 break; 2163 } 2164 2165 /* 2166 * If all options have default values, no need to keep the mbuf. 2167 */ 2168 if (im6o->im6o_multicast_ifp == NULL && 2169 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2170 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2171 im6o->im6o_memberships.lh_first == NULL) { 2172 free(*im6op, M_IPMOPTS); 2173 *im6op = NULL; 2174 } 2175 2176 return(error); 2177 } 2178 2179 /* 2180 * Return the IP6 multicast options in response to user getsockopt(). 2181 */ 2182 static int 2183 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2184 { 2185 u_int *hlim, *loop, *ifindex; 2186 2187 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2188 2189 switch (optname) { 2190 2191 case IPV6_MULTICAST_IF: 2192 ifindex = mtod(*mp, u_int *); 2193 (*mp)->m_len = sizeof(u_int); 2194 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2195 *ifindex = 0; 2196 else 2197 *ifindex = im6o->im6o_multicast_ifp->if_index; 2198 return(0); 2199 2200 case IPV6_MULTICAST_HOPS: 2201 hlim = mtod(*mp, u_int *); 2202 (*mp)->m_len = sizeof(u_int); 2203 if (im6o == NULL) 2204 *hlim = ip6_defmcasthlim; 2205 else 2206 *hlim = im6o->im6o_multicast_hlim; 2207 return(0); 2208 2209 case IPV6_MULTICAST_LOOP: 2210 loop = mtod(*mp, u_int *); 2211 (*mp)->m_len = sizeof(u_int); 2212 if (im6o == NULL) 2213 *loop = ip6_defmcasthlim; 2214 else 2215 *loop = im6o->im6o_multicast_loop; 2216 return(0); 2217 2218 default: 2219 return(EOPNOTSUPP); 2220 } 2221 } 2222 2223 /* 2224 * Discard the IP6 multicast options. 2225 */ 2226 void 2227 ip6_freemoptions(struct ip6_moptions *im6o) 2228 { 2229 struct in6_multi_mship *imm; 2230 2231 if (im6o == NULL) 2232 return; 2233 2234 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2235 LIST_REMOVE(imm, i6mm_chain); 2236 if (imm->i6mm_maddr) 2237 in6_delmulti(imm->i6mm_maddr); 2238 free(imm, M_IPMADDR); 2239 } 2240 free(im6o, M_IPMOPTS); 2241 } 2242 2243 /* 2244 * Set IPv6 outgoing packet options based on advanced API. 2245 */ 2246 int 2247 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, int priv, 2248 int needcopy) 2249 { 2250 struct cmsghdr *cm = 0; 2251 2252 if (control == 0 || opt == 0) 2253 return(EINVAL); 2254 2255 init_ip6pktopts(opt); 2256 2257 /* 2258 * XXX: Currently, we assume all the optional information is stored 2259 * in a single mbuf. 2260 */ 2261 if (control->m_next) 2262 return(EINVAL); 2263 2264 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2265 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2266 cm = mtod(control, struct cmsghdr *); 2267 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2268 return(EINVAL); 2269 if (cm->cmsg_level != IPPROTO_IPV6) 2270 continue; 2271 2272 /* 2273 * XXX should check if RFC2292 API is mixed with 2292bis API 2274 */ 2275 switch (cm->cmsg_type) { 2276 case IPV6_PKTINFO: 2277 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2278 return(EINVAL); 2279 if (needcopy) { 2280 /* XXX: Is it really WAITOK? */ 2281 opt->ip6po_pktinfo = 2282 malloc(sizeof(struct in6_pktinfo), 2283 M_IP6OPT, M_WAITOK); 2284 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2285 sizeof(struct in6_pktinfo)); 2286 } else 2287 opt->ip6po_pktinfo = 2288 (struct in6_pktinfo *)CMSG_DATA(cm); 2289 if (opt->ip6po_pktinfo->ipi6_ifindex && 2290 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2291 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2292 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2293 2294 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2295 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2296 return(ENXIO); 2297 } 2298 2299 /* 2300 * Check if the requested source address is indeed a 2301 * unicast address assigned to the node, and can be 2302 * used as the packet's source address. 2303 */ 2304 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2305 struct in6_ifaddr *ia6; 2306 struct sockaddr_in6 sin6; 2307 2308 bzero(&sin6, sizeof(sin6)); 2309 sin6.sin6_len = sizeof(sin6); 2310 sin6.sin6_family = AF_INET6; 2311 sin6.sin6_addr = 2312 opt->ip6po_pktinfo->ipi6_addr; 2313 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2314 if (ia6 == NULL || 2315 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2316 IN6_IFF_NOTREADY)) != 0) 2317 return(EADDRNOTAVAIL); 2318 } 2319 break; 2320 2321 case IPV6_HOPLIMIT: 2322 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2323 return(EINVAL); 2324 2325 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2326 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2327 return(EINVAL); 2328 break; 2329 2330 case IPV6_NEXTHOP: 2331 if (!priv) 2332 return(EPERM); 2333 2334 if (cm->cmsg_len < sizeof(u_char) || 2335 /* check if cmsg_len is large enough for sa_len */ 2336 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2337 return(EINVAL); 2338 2339 if (needcopy) { 2340 opt->ip6po_nexthop = 2341 malloc(*CMSG_DATA(cm), 2342 M_IP6OPT, M_WAITOK); 2343 bcopy(CMSG_DATA(cm), 2344 opt->ip6po_nexthop, 2345 *CMSG_DATA(cm)); 2346 } else 2347 opt->ip6po_nexthop = 2348 (struct sockaddr *)CMSG_DATA(cm); 2349 break; 2350 2351 case IPV6_HOPOPTS: 2352 { 2353 struct ip6_hbh *hbh; 2354 int hbhlen; 2355 2356 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2357 return(EINVAL); 2358 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2359 hbhlen = (hbh->ip6h_len + 1) << 3; 2360 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2361 return(EINVAL); 2362 2363 if (needcopy) { 2364 opt->ip6po_hbh = 2365 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2366 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2367 } else 2368 opt->ip6po_hbh = hbh; 2369 break; 2370 } 2371 2372 case IPV6_DSTOPTS: 2373 { 2374 struct ip6_dest *dest, **newdest; 2375 int destlen; 2376 2377 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2378 return(EINVAL); 2379 dest = (struct ip6_dest *)CMSG_DATA(cm); 2380 destlen = (dest->ip6d_len + 1) << 3; 2381 if (cm->cmsg_len != CMSG_LEN(destlen)) 2382 return(EINVAL); 2383 2384 /* 2385 * The old advacned API is ambiguous on this 2386 * point. Our approach is to determine the 2387 * position based according to the existence 2388 * of a routing header. Note, however, that 2389 * this depends on the order of the extension 2390 * headers in the ancillary data; the 1st part 2391 * of the destination options header must 2392 * appear before the routing header in the 2393 * ancillary data, too. 2394 * RFC2292bis solved the ambiguity by 2395 * introducing separate cmsg types. 2396 */ 2397 if (opt->ip6po_rthdr == NULL) 2398 newdest = &opt->ip6po_dest1; 2399 else 2400 newdest = &opt->ip6po_dest2; 2401 2402 if (needcopy) { 2403 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2404 bcopy(dest, *newdest, destlen); 2405 } else 2406 *newdest = dest; 2407 2408 break; 2409 } 2410 2411 case IPV6_RTHDR: 2412 { 2413 struct ip6_rthdr *rth; 2414 int rthlen; 2415 2416 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2417 return(EINVAL); 2418 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2419 rthlen = (rth->ip6r_len + 1) << 3; 2420 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2421 return(EINVAL); 2422 2423 switch (rth->ip6r_type) { 2424 case IPV6_RTHDR_TYPE_0: 2425 /* must contain one addr */ 2426 if (rth->ip6r_len == 0) 2427 return(EINVAL); 2428 /* length must be even */ 2429 if (rth->ip6r_len % 2) 2430 return(EINVAL); 2431 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2432 return(EINVAL); 2433 break; 2434 default: 2435 return(EINVAL); /* not supported */ 2436 } 2437 2438 if (needcopy) { 2439 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2440 M_WAITOK); 2441 bcopy(rth, opt->ip6po_rthdr, rthlen); 2442 } else 2443 opt->ip6po_rthdr = rth; 2444 2445 break; 2446 } 2447 2448 default: 2449 return(ENOPROTOOPT); 2450 } 2451 } 2452 2453 return(0); 2454 } 2455 2456 /* 2457 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2458 * packet to the input queue of a specified interface. Note that this 2459 * calls the output routine of the loopback "driver", but with an interface 2460 * pointer that might NOT be &loif -- easier than replicating that code here. 2461 */ 2462 void 2463 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2464 { 2465 struct mbuf *copym; 2466 struct ip6_hdr *ip6; 2467 2468 copym = m_copy(m, 0, M_COPYALL); 2469 if (copym == NULL) 2470 return; 2471 2472 /* 2473 * Make sure to deep-copy IPv6 header portion in case the data 2474 * is in an mbuf cluster, so that we can safely override the IPv6 2475 * header portion later. 2476 */ 2477 if ((copym->m_flags & M_EXT) != 0 || 2478 copym->m_len < sizeof(struct ip6_hdr)) { 2479 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2480 if (copym == NULL) 2481 return; 2482 } 2483 2484 #ifdef DIAGNOSTIC 2485 if (copym->m_len < sizeof(*ip6)) { 2486 m_freem(copym); 2487 return; 2488 } 2489 #endif 2490 2491 ip6 = mtod(copym, struct ip6_hdr *); 2492 /* 2493 * clear embedded scope identifiers if necessary. 2494 * in6_clearscope will touch the addresses only when necessary. 2495 */ 2496 in6_clearscope(&ip6->ip6_src); 2497 in6_clearscope(&ip6->ip6_dst); 2498 2499 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2500 } 2501 2502 /* 2503 * Chop IPv6 header off from the payload. 2504 */ 2505 static int 2506 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2507 { 2508 struct mbuf *mh; 2509 struct ip6_hdr *ip6; 2510 2511 ip6 = mtod(m, struct ip6_hdr *); 2512 if (m->m_len > sizeof(*ip6)) { 2513 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 2514 if (mh == 0) { 2515 m_freem(m); 2516 return ENOBUFS; 2517 } 2518 M_MOVE_PKTHDR(mh, m); 2519 MH_ALIGN(mh, sizeof(*ip6)); 2520 m->m_len -= sizeof(*ip6); 2521 m->m_data += sizeof(*ip6); 2522 mh->m_next = m; 2523 m = mh; 2524 m->m_len = sizeof(*ip6); 2525 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2526 } 2527 exthdrs->ip6e_ip6 = m; 2528 return 0; 2529 } 2530 2531 /* 2532 * Compute IPv6 extension header length. 2533 */ 2534 int 2535 ip6_optlen(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