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 1.15 2004/12/21 02:54:47 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 #ifdef SCOPEDROUTING 525 /* XXX: sin6_scope_id should already be fixed at this point */ 526 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 527 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 528 #endif 529 } 530 #if defined(IPSEC) || defined(FAST_IPSEC) 531 if (needipsec && needipsectun) { 532 struct ipsec_output_state state; 533 534 /* 535 * All the extension headers will become inaccessible 536 * (since they can be encrypted). 537 * Don't panic, we need no more updates to extension headers 538 * on inner IPv6 packet (since they are now encapsulated). 539 * 540 * IPv6 [ESP|AH] IPv6 [extension headers] payload 541 */ 542 bzero(&exthdrs, sizeof(exthdrs)); 543 exthdrs.ip6e_ip6 = m; 544 545 bzero(&state, sizeof(state)); 546 state.m = m; 547 state.ro = (struct route *)ro; 548 state.dst = (struct sockaddr *)dst; 549 550 error = ipsec6_output_tunnel(&state, sp, flags); 551 552 m = state.m; 553 ro = (struct route_in6 *)state.ro; 554 dst = (struct sockaddr_in6 *)state.dst; 555 if (error) { 556 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 557 m0 = m = NULL; 558 m = NULL; 559 switch (error) { 560 case EHOSTUNREACH: 561 case ENETUNREACH: 562 case EMSGSIZE: 563 case ENOBUFS: 564 case ENOMEM: 565 break; 566 default: 567 printf("ip6_output (ipsec): error code %d\n", error); 568 /* fall through */ 569 case ENOENT: 570 /* don't show these error codes to the user */ 571 error = 0; 572 break; 573 } 574 goto bad; 575 } 576 577 exthdrs.ip6e_ip6 = m; 578 } 579 #endif /* IPSEC */ 580 581 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 582 /* Unicast */ 583 584 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 585 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 586 /* xxx 587 * interface selection comes here 588 * if an interface is specified from an upper layer, 589 * ifp must point it. 590 */ 591 if (ro->ro_rt == 0) { 592 /* 593 * non-bsdi always clone routes, if parent is 594 * PRF_CLONING. 595 */ 596 rtalloc((struct route *)ro); 597 } 598 if (ro->ro_rt == 0) { 599 ip6stat.ip6s_noroute++; 600 error = EHOSTUNREACH; 601 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 602 goto bad; 603 } 604 ia = ifatoia6(ro->ro_rt->rt_ifa); 605 ifp = ro->ro_rt->rt_ifp; 606 ro->ro_rt->rt_use++; 607 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 608 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 609 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 610 611 in6_ifstat_inc(ifp, ifs6_out_request); 612 613 /* 614 * Check if the outgoing interface conflicts with 615 * the interface specified by ifi6_ifindex (if specified). 616 * Note that loopback interface is always okay. 617 * (this may happen when we are sending a packet to one of 618 * our own addresses.) 619 */ 620 if (opt && opt->ip6po_pktinfo 621 && opt->ip6po_pktinfo->ipi6_ifindex) { 622 if (!(ifp->if_flags & IFF_LOOPBACK) 623 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 624 ip6stat.ip6s_noroute++; 625 in6_ifstat_inc(ifp, ifs6_out_discard); 626 error = EHOSTUNREACH; 627 goto bad; 628 } 629 } 630 631 if (opt && opt->ip6po_hlim != -1) 632 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 633 } else { 634 /* Multicast */ 635 struct in6_multi *in6m; 636 637 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 638 639 /* 640 * See if the caller provided any multicast options 641 */ 642 ifp = NULL; 643 if (im6o != NULL) { 644 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 645 if (im6o->im6o_multicast_ifp != NULL) 646 ifp = im6o->im6o_multicast_ifp; 647 } else 648 ip6->ip6_hlim = ip6_defmcasthlim; 649 650 /* 651 * See if the caller provided the outgoing interface 652 * as an ancillary data. 653 * Boundary check for ifindex is assumed to be already done. 654 */ 655 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 656 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 657 658 /* 659 * If the destination is a node-local scope multicast, 660 * the packet should be loop-backed only. 661 */ 662 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 663 /* 664 * If the outgoing interface is already specified, 665 * it should be a loopback interface. 666 */ 667 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 668 ip6stat.ip6s_badscope++; 669 error = ENETUNREACH; /* XXX: better error? */ 670 /* XXX correct ifp? */ 671 in6_ifstat_inc(ifp, ifs6_out_discard); 672 goto bad; 673 } else { 674 ifp = &loif[0]; 675 } 676 } 677 678 if (opt && opt->ip6po_hlim != -1) 679 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 680 681 /* 682 * If caller did not provide an interface lookup a 683 * default in the routing table. This is either a 684 * default for the speicfied group (i.e. a host 685 * route), or a multicast default (a route for the 686 * ``net'' ff00::/8). 687 */ 688 if (ifp == NULL) { 689 if (ro->ro_rt == NULL) { 690 ro->ro_rt = rtlookup( 691 (struct sockaddr *)&ro->ro_dst, 0, 0UL); 692 } 693 if (ro->ro_rt == NULL) { 694 ip6stat.ip6s_noroute++; 695 error = EHOSTUNREACH; 696 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 697 goto bad; 698 } 699 ia = ifatoia6(ro->ro_rt->rt_ifa); 700 ifp = ro->ro_rt->rt_ifp; 701 ro->ro_rt->rt_use++; 702 } 703 704 if ((flags & IPV6_FORWARDING) == 0) 705 in6_ifstat_inc(ifp, ifs6_out_request); 706 in6_ifstat_inc(ifp, ifs6_out_mcast); 707 708 /* 709 * Confirm that the outgoing interface supports multicast. 710 */ 711 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 712 ip6stat.ip6s_noroute++; 713 in6_ifstat_inc(ifp, ifs6_out_discard); 714 error = ENETUNREACH; 715 goto bad; 716 } 717 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 718 if (in6m != NULL && 719 (im6o == NULL || im6o->im6o_multicast_loop)) { 720 /* 721 * If we belong to the destination multicast group 722 * on the outgoing interface, and the caller did not 723 * forbid loopback, loop back a copy. 724 */ 725 ip6_mloopback(ifp, m, dst); 726 } else { 727 /* 728 * If we are acting as a multicast router, perform 729 * multicast forwarding as if the packet had just 730 * arrived on the interface to which we are about 731 * to send. The multicast forwarding function 732 * recursively calls this function, using the 733 * IPV6_FORWARDING flag to prevent infinite recursion. 734 * 735 * Multicasts that are looped back by ip6_mloopback(), 736 * above, will be forwarded by the ip6_input() routine, 737 * if necessary. 738 */ 739 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 740 if (ip6_mforward(ip6, ifp, m) != 0) { 741 m_freem(m); 742 goto done; 743 } 744 } 745 } 746 /* 747 * Multicasts with a hoplimit of zero may be looped back, 748 * above, but must not be transmitted on a network. 749 * Also, multicasts addressed to the loopback interface 750 * are not sent -- the above call to ip6_mloopback() will 751 * loop back a copy if this host actually belongs to the 752 * destination group on the loopback interface. 753 */ 754 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 755 m_freem(m); 756 goto done; 757 } 758 } 759 760 /* 761 * Fill the outgoing inteface to tell the upper layer 762 * to increment per-interface statistics. 763 */ 764 if (ifpp) 765 *ifpp = ifp; 766 767 /* 768 * Determine path MTU. 769 */ 770 if (ro_pmtu != ro) { 771 /* The first hop and the final destination may differ. */ 772 struct sockaddr_in6 *sin6_fin = 773 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 774 775 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 776 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 777 &finaldst))) { 778 RTFREE(ro_pmtu->ro_rt); 779 ro_pmtu->ro_rt = (struct rtentry *)0; 780 } 781 if (ro_pmtu->ro_rt == 0) { 782 bzero(sin6_fin, sizeof(*sin6_fin)); 783 sin6_fin->sin6_family = AF_INET6; 784 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 785 sin6_fin->sin6_addr = finaldst; 786 787 rtalloc((struct route *)ro_pmtu); 788 } 789 } 790 if (ro_pmtu->ro_rt != NULL) { 791 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 792 793 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 794 if (mtu > ifmtu || mtu == 0) { 795 /* 796 * The MTU on the route is larger than the MTU on 797 * the interface! This shouldn't happen, unless the 798 * MTU of the interface has been changed after the 799 * interface was brought up. Change the MTU in the 800 * route to match the interface MTU (as long as the 801 * field isn't locked). 802 * 803 * if MTU on the route is 0, we need to fix the MTU. 804 * this case happens with path MTU discovery timeouts. 805 */ 806 mtu = ifmtu; 807 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 808 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 809 } 810 } else { 811 mtu = nd_ifinfo[ifp->if_index].linkmtu; 812 } 813 814 /* 815 * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting 816 */ 817 if ((flags & IPV6_MINMTU) != 0 && mtu > IPV6_MMTU) 818 mtu = IPV6_MMTU; 819 820 /* Fake scoped addresses */ 821 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 822 /* 823 * If source or destination address is a scoped address, and 824 * the packet is going to be sent to a loopback interface, 825 * we should keep the original interface. 826 */ 827 828 /* 829 * XXX: this is a very experimental and temporary solution. 830 * We eventually have sockaddr_in6 and use the sin6_scope_id 831 * field of the structure here. 832 * We rely on the consistency between two scope zone ids 833 * of source and destination, which should already be assured. 834 * Larger scopes than link will be supported in the future. 835 */ 836 origifp = NULL; 837 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 838 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 839 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 840 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 841 /* 842 * XXX: origifp can be NULL even in those two cases above. 843 * For example, if we remove the (only) link-local address 844 * from the loopback interface, and try to send a link-local 845 * address without link-id information. Then the source 846 * address is ::1, and the destination address is the 847 * link-local address with its s6_addr16[1] being zero. 848 * What is worse, if the packet goes to the loopback interface 849 * by a default rejected route, the null pointer would be 850 * passed to looutput, and the kernel would hang. 851 * The following last resort would prevent such disaster. 852 */ 853 if (origifp == NULL) 854 origifp = ifp; 855 } 856 else 857 origifp = ifp; 858 #ifndef SCOPEDROUTING 859 /* 860 * clear embedded scope identifiers if necessary. 861 * in6_clearscope will touch the addresses only when necessary. 862 */ 863 in6_clearscope(&ip6->ip6_src); 864 in6_clearscope(&ip6->ip6_dst); 865 #endif 866 867 /* 868 * Check with the firewall... 869 */ 870 if (ip6_fw_enable && ip6_fw_chk_ptr) { 871 u_short port = 0; 872 m->m_pkthdr.rcvif = NULL; /* XXX */ 873 /* If ipfw says divert, we have to just drop packet */ 874 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 875 m_freem(m); 876 goto done; 877 } 878 if (!m) { 879 error = EACCES; 880 goto done; 881 } 882 } 883 884 /* 885 * If the outgoing packet contains a hop-by-hop options header, 886 * it must be examined and processed even by the source node. 887 * (RFC 2460, section 4.) 888 */ 889 if (exthdrs.ip6e_hbh) { 890 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 891 u_int32_t dummy1; /* XXX unused */ 892 u_int32_t dummy2; /* XXX unused */ 893 894 #ifdef DIAGNOSTIC 895 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 896 panic("ip6e_hbh is not continuous"); 897 #endif 898 /* 899 * XXX: if we have to send an ICMPv6 error to the sender, 900 * we need the M_LOOP flag since icmp6_error() expects 901 * the IPv6 and the hop-by-hop options header are 902 * continuous unless the flag is set. 903 */ 904 m->m_flags |= M_LOOP; 905 m->m_pkthdr.rcvif = ifp; 906 if (ip6_process_hopopts(m, 907 (u_int8_t *)(hbh + 1), 908 ((hbh->ip6h_len + 1) << 3) - 909 sizeof(struct ip6_hbh), 910 &dummy1, &dummy2) < 0) { 911 /* m was already freed at this point */ 912 error = EINVAL;/* better error? */ 913 goto done; 914 } 915 m->m_flags &= ~M_LOOP; /* XXX */ 916 m->m_pkthdr.rcvif = NULL; 917 } 918 919 /* 920 * Run through list of hooks for output packets. 921 */ 922 if (pfil_has_hooks(&inet6_pfil_hook)) { 923 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 924 if (error != 0 || m == NULL) 925 goto done; 926 ip6 = mtod(m, struct ip6_hdr *); 927 } 928 929 /* 930 * Send the packet to the outgoing interface. 931 * If necessary, do IPv6 fragmentation before sending. 932 */ 933 tlen = m->m_pkthdr.len; 934 if (tlen <= mtu 935 #ifdef notyet 936 /* 937 * On any link that cannot convey a 1280-octet packet in one piece, 938 * link-specific fragmentation and reassembly must be provided at 939 * a layer below IPv6. [RFC 2460, sec.5] 940 * Thus if the interface has ability of link-level fragmentation, 941 * we can just send the packet even if the packet size is 942 * larger than the link's MTU. 943 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 944 */ 945 946 || ifp->if_flags & IFF_FRAGMENTABLE 947 #endif 948 ) 949 { 950 /* Record statistics for this interface address. */ 951 if (ia && !(flags & IPV6_FORWARDING)) { 952 ia->ia_ifa.if_opackets++; 953 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 954 } 955 #ifdef IPSEC 956 /* clean ipsec history once it goes out of the node */ 957 ipsec_delaux(m); 958 #endif 959 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 960 goto done; 961 } else if (mtu < IPV6_MMTU) { 962 /* 963 * note that path MTU is never less than IPV6_MMTU 964 * (see icmp6_input). 965 */ 966 error = EMSGSIZE; 967 in6_ifstat_inc(ifp, ifs6_out_fragfail); 968 goto bad; 969 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 970 error = EMSGSIZE; 971 in6_ifstat_inc(ifp, ifs6_out_fragfail); 972 goto bad; 973 } else { 974 struct mbuf **mnext, *m_frgpart; 975 struct ip6_frag *ip6f; 976 u_int32_t id = htonl(ip6_id++); 977 u_char nextproto; 978 979 /* 980 * Too large for the destination or interface; 981 * fragment if possible. 982 * Must be able to put at least 8 bytes per fragment. 983 */ 984 hlen = unfragpartlen; 985 if (mtu > IPV6_MAXPACKET) 986 mtu = IPV6_MAXPACKET; 987 988 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 989 if (len < 8) { 990 error = EMSGSIZE; 991 in6_ifstat_inc(ifp, ifs6_out_fragfail); 992 goto bad; 993 } 994 995 mnext = &m->m_nextpkt; 996 997 /* 998 * Change the next header field of the last header in the 999 * unfragmentable part. 1000 */ 1001 if (exthdrs.ip6e_rthdr) { 1002 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1003 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1004 } else if (exthdrs.ip6e_dest1) { 1005 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1006 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1007 } else if (exthdrs.ip6e_hbh) { 1008 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1009 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1010 } else { 1011 nextproto = ip6->ip6_nxt; 1012 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1013 } 1014 1015 /* 1016 * Loop through length of segment after first fragment, 1017 * make new header and copy data of each part and link onto 1018 * chain. 1019 */ 1020 m0 = m; 1021 for (off = hlen; off < tlen; off += len) { 1022 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1023 if (!m) { 1024 error = ENOBUFS; 1025 ip6stat.ip6s_odropped++; 1026 goto sendorfree; 1027 } 1028 m->m_pkthdr.rcvif = NULL; 1029 m->m_flags = m0->m_flags & M_COPYFLAGS; 1030 *mnext = m; 1031 mnext = &m->m_nextpkt; 1032 m->m_data += max_linkhdr; 1033 mhip6 = mtod(m, struct ip6_hdr *); 1034 *mhip6 = *ip6; 1035 m->m_len = sizeof(*mhip6); 1036 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1037 if (error) { 1038 ip6stat.ip6s_odropped++; 1039 goto sendorfree; 1040 } 1041 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1042 if (off + len >= tlen) 1043 len = tlen - off; 1044 else 1045 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1046 mhip6->ip6_plen = htons((u_short)(len + hlen + 1047 sizeof(*ip6f) - 1048 sizeof(struct ip6_hdr))); 1049 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1050 error = ENOBUFS; 1051 ip6stat.ip6s_odropped++; 1052 goto sendorfree; 1053 } 1054 m_cat(m, m_frgpart); 1055 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1056 m->m_pkthdr.rcvif = (struct ifnet *)0; 1057 ip6f->ip6f_reserved = 0; 1058 ip6f->ip6f_ident = id; 1059 ip6f->ip6f_nxt = nextproto; 1060 ip6stat.ip6s_ofragments++; 1061 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1062 } 1063 1064 in6_ifstat_inc(ifp, ifs6_out_fragok); 1065 } 1066 1067 /* 1068 * Remove leading garbages. 1069 */ 1070 sendorfree: 1071 m = m0->m_nextpkt; 1072 m0->m_nextpkt = 0; 1073 m_freem(m0); 1074 for (m0 = m; m; m = m0) { 1075 m0 = m->m_nextpkt; 1076 m->m_nextpkt = 0; 1077 if (error == 0) { 1078 /* Record statistics for this interface address. */ 1079 if (ia) { 1080 ia->ia_ifa.if_opackets++; 1081 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1082 } 1083 #ifdef IPSEC 1084 /* clean ipsec history once it goes out of the node */ 1085 ipsec_delaux(m); 1086 #endif 1087 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1088 } else 1089 m_freem(m); 1090 } 1091 1092 if (error == 0) 1093 ip6stat.ip6s_fragmented++; 1094 1095 done: 1096 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1097 RTFREE(ro->ro_rt); 1098 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1099 RTFREE(ro_pmtu->ro_rt); 1100 } 1101 1102 #ifdef IPSEC 1103 if (sp != NULL) 1104 key_freesp(sp); 1105 #endif /* IPSEC */ 1106 #ifdef FAST_IPSEC 1107 if (sp != NULL) 1108 KEY_FREESP(&sp); 1109 #endif /* FAST_IPSEC */ 1110 1111 return(error); 1112 1113 freehdrs: 1114 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1115 m_freem(exthdrs.ip6e_dest1); 1116 m_freem(exthdrs.ip6e_rthdr); 1117 m_freem(exthdrs.ip6e_dest2); 1118 /* fall through */ 1119 bad: 1120 m_freem(m); 1121 goto done; 1122 } 1123 1124 static int 1125 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1126 { 1127 struct mbuf *m; 1128 1129 if (hlen > MCLBYTES) 1130 return(ENOBUFS); /* XXX */ 1131 1132 MGET(m, MB_DONTWAIT, MT_DATA); 1133 if (!m) 1134 return(ENOBUFS); 1135 1136 if (hlen > MLEN) { 1137 MCLGET(m, MB_DONTWAIT); 1138 if ((m->m_flags & M_EXT) == 0) { 1139 m_free(m); 1140 return(ENOBUFS); 1141 } 1142 } 1143 m->m_len = hlen; 1144 if (hdr) 1145 bcopy(hdr, mtod(m, caddr_t), hlen); 1146 1147 *mp = m; 1148 return(0); 1149 } 1150 1151 /* 1152 * Insert jumbo payload option. 1153 */ 1154 static int 1155 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1156 { 1157 struct mbuf *mopt; 1158 u_char *optbuf; 1159 u_int32_t v; 1160 1161 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1162 1163 /* 1164 * If there is no hop-by-hop options header, allocate new one. 1165 * If there is one but it doesn't have enough space to store the 1166 * jumbo payload option, allocate a cluster to store the whole options. 1167 * Otherwise, use it to store the options. 1168 */ 1169 if (exthdrs->ip6e_hbh == 0) { 1170 MGET(mopt, MB_DONTWAIT, MT_DATA); 1171 if (mopt == 0) 1172 return(ENOBUFS); 1173 mopt->m_len = JUMBOOPTLEN; 1174 optbuf = mtod(mopt, u_char *); 1175 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1176 exthdrs->ip6e_hbh = mopt; 1177 } else { 1178 struct ip6_hbh *hbh; 1179 1180 mopt = exthdrs->ip6e_hbh; 1181 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1182 /* 1183 * XXX assumption: 1184 * - exthdrs->ip6e_hbh is not referenced from places 1185 * other than exthdrs. 1186 * - exthdrs->ip6e_hbh is not an mbuf chain. 1187 */ 1188 int oldoptlen = mopt->m_len; 1189 struct mbuf *n; 1190 1191 /* 1192 * XXX: give up if the whole (new) hbh header does 1193 * not fit even in an mbuf cluster. 1194 */ 1195 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1196 return(ENOBUFS); 1197 1198 /* 1199 * As a consequence, we must always prepare a cluster 1200 * at this point. 1201 */ 1202 MGET(n, MB_DONTWAIT, MT_DATA); 1203 if (n) { 1204 MCLGET(n, MB_DONTWAIT); 1205 if ((n->m_flags & M_EXT) == 0) { 1206 m_freem(n); 1207 n = NULL; 1208 } 1209 } 1210 if (!n) 1211 return(ENOBUFS); 1212 n->m_len = oldoptlen + JUMBOOPTLEN; 1213 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1214 oldoptlen); 1215 optbuf = mtod(n, caddr_t) + oldoptlen; 1216 m_freem(mopt); 1217 mopt = exthdrs->ip6e_hbh = n; 1218 } else { 1219 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1220 mopt->m_len += JUMBOOPTLEN; 1221 } 1222 optbuf[0] = IP6OPT_PADN; 1223 optbuf[1] = 1; 1224 1225 /* 1226 * Adjust the header length according to the pad and 1227 * the jumbo payload option. 1228 */ 1229 hbh = mtod(mopt, struct ip6_hbh *); 1230 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1231 } 1232 1233 /* fill in the option. */ 1234 optbuf[2] = IP6OPT_JUMBO; 1235 optbuf[3] = 4; 1236 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1237 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1238 1239 /* finally, adjust the packet header length */ 1240 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1241 1242 return(0); 1243 #undef JUMBOOPTLEN 1244 } 1245 1246 /* 1247 * Insert fragment header and copy unfragmentable header portions. 1248 */ 1249 static int 1250 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1251 struct ip6_frag **frghdrp) 1252 { 1253 struct mbuf *n, *mlast; 1254 1255 if (hlen > sizeof(struct ip6_hdr)) { 1256 n = m_copym(m0, sizeof(struct ip6_hdr), 1257 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1258 if (n == 0) 1259 return(ENOBUFS); 1260 m->m_next = n; 1261 } else 1262 n = m; 1263 1264 /* Search for the last mbuf of unfragmentable part. */ 1265 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1266 ; 1267 1268 if ((mlast->m_flags & M_EXT) == 0 && 1269 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1270 /* use the trailing space of the last mbuf for the fragment hdr */ 1271 *frghdrp = 1272 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1273 mlast->m_len += sizeof(struct ip6_frag); 1274 m->m_pkthdr.len += sizeof(struct ip6_frag); 1275 } else { 1276 /* allocate a new mbuf for the fragment header */ 1277 struct mbuf *mfrg; 1278 1279 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1280 if (mfrg == 0) 1281 return(ENOBUFS); 1282 mfrg->m_len = sizeof(struct ip6_frag); 1283 *frghdrp = mtod(mfrg, struct ip6_frag *); 1284 mlast->m_next = mfrg; 1285 } 1286 1287 return(0); 1288 } 1289 1290 /* 1291 * IP6 socket option processing. 1292 */ 1293 int 1294 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1295 { 1296 int privileged; 1297 struct inpcb *in6p = sotoinpcb(so); 1298 int error, optval; 1299 int level, op, optname; 1300 int optlen; 1301 struct thread *td; 1302 1303 if (sopt) { 1304 level = sopt->sopt_level; 1305 op = sopt->sopt_dir; 1306 optname = sopt->sopt_name; 1307 optlen = sopt->sopt_valsize; 1308 td = sopt->sopt_td; 1309 } else { 1310 panic("ip6_ctloutput: arg soopt is NULL"); 1311 /* NOT REACHED */ 1312 td = NULL; 1313 } 1314 error = optval = 0; 1315 1316 privileged = (td == NULL || suser(td)) ? 0 : 1; 1317 1318 if (level == IPPROTO_IPV6) { 1319 switch (op) { 1320 1321 case SOPT_SET: 1322 switch (optname) { 1323 case IPV6_PKTOPTIONS: 1324 { 1325 struct mbuf *m; 1326 1327 error = soopt_getm(sopt, &m); /* XXX */ 1328 if (error != NULL) 1329 break; 1330 error = soopt_mcopyin(sopt, m); /* XXX */ 1331 if (error != NULL) 1332 break; 1333 error = ip6_pcbopts(&in6p->in6p_outputopts, 1334 m, so, sopt); 1335 m_freem(m); /* XXX */ 1336 break; 1337 } 1338 1339 /* 1340 * Use of some Hop-by-Hop options or some 1341 * Destination options, might require special 1342 * privilege. That is, normal applications 1343 * (without special privilege) might be forbidden 1344 * from setting certain options in outgoing packets, 1345 * and might never see certain options in received 1346 * packets. [RFC 2292 Section 6] 1347 * KAME specific note: 1348 * KAME prevents non-privileged users from sending or 1349 * receiving ANY hbh/dst options in order to avoid 1350 * overhead of parsing options in the kernel. 1351 */ 1352 case IPV6_UNICAST_HOPS: 1353 case IPV6_CHECKSUM: 1354 case IPV6_FAITH: 1355 1356 case IPV6_V6ONLY: 1357 if (optlen != sizeof(int)) { 1358 error = EINVAL; 1359 break; 1360 } 1361 error = sooptcopyin(sopt, &optval, 1362 sizeof optval, sizeof optval); 1363 if (error) 1364 break; 1365 switch (optname) { 1366 1367 case IPV6_UNICAST_HOPS: 1368 if (optval < -1 || optval >= 256) 1369 error = EINVAL; 1370 else { 1371 /* -1 = kernel default */ 1372 in6p->in6p_hops = optval; 1373 1374 if ((in6p->in6p_vflag & 1375 INP_IPV4) != 0) 1376 in6p->inp_ip_ttl = optval; 1377 } 1378 break; 1379 #define OPTSET(bit) \ 1380 do { \ 1381 if (optval) \ 1382 in6p->in6p_flags |= (bit); \ 1383 else \ 1384 in6p->in6p_flags &= ~(bit); \ 1385 } while (0) 1386 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1387 1388 case IPV6_CHECKSUM: 1389 in6p->in6p_cksum = optval; 1390 break; 1391 1392 case IPV6_FAITH: 1393 OPTSET(IN6P_FAITH); 1394 break; 1395 1396 case IPV6_V6ONLY: 1397 /* 1398 * make setsockopt(IPV6_V6ONLY) 1399 * available only prior to bind(2). 1400 * see ipng mailing list, Jun 22 2001. 1401 */ 1402 if (in6p->in6p_lport || 1403 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1404 { 1405 error = EINVAL; 1406 break; 1407 } 1408 OPTSET(IN6P_IPV6_V6ONLY); 1409 if (optval) 1410 in6p->in6p_vflag &= ~INP_IPV4; 1411 else 1412 in6p->in6p_vflag |= INP_IPV4; 1413 break; 1414 } 1415 break; 1416 1417 case IPV6_PKTINFO: 1418 case IPV6_HOPLIMIT: 1419 case IPV6_HOPOPTS: 1420 case IPV6_DSTOPTS: 1421 case IPV6_RTHDR: 1422 /* RFC 2292 */ 1423 if (optlen != sizeof(int)) { 1424 error = EINVAL; 1425 break; 1426 } 1427 error = sooptcopyin(sopt, &optval, 1428 sizeof optval, sizeof optval); 1429 if (error) 1430 break; 1431 switch (optname) { 1432 case IPV6_PKTINFO: 1433 OPTSET(IN6P_PKTINFO); 1434 break; 1435 case IPV6_HOPLIMIT: 1436 OPTSET(IN6P_HOPLIMIT); 1437 break; 1438 case IPV6_HOPOPTS: 1439 /* 1440 * Check super-user privilege. 1441 * See comments for IPV6_RECVHOPOPTS. 1442 */ 1443 if (!privileged) 1444 return(EPERM); 1445 OPTSET(IN6P_HOPOPTS); 1446 break; 1447 case IPV6_DSTOPTS: 1448 if (!privileged) 1449 return(EPERM); 1450 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1451 break; 1452 case IPV6_RTHDR: 1453 OPTSET(IN6P_RTHDR); 1454 break; 1455 } 1456 break; 1457 #undef OPTSET 1458 1459 case IPV6_MULTICAST_IF: 1460 case IPV6_MULTICAST_HOPS: 1461 case IPV6_MULTICAST_LOOP: 1462 case IPV6_JOIN_GROUP: 1463 case IPV6_LEAVE_GROUP: 1464 { 1465 struct mbuf *m; 1466 if (sopt->sopt_valsize > MLEN) { 1467 error = EMSGSIZE; 1468 break; 1469 } 1470 /* XXX */ 1471 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1472 if (m == 0) { 1473 error = ENOBUFS; 1474 break; 1475 } 1476 m->m_len = sopt->sopt_valsize; 1477 error = sooptcopyin(sopt, mtod(m, char *), 1478 m->m_len, m->m_len); 1479 error = ip6_setmoptions(sopt->sopt_name, 1480 &in6p->in6p_moptions, 1481 m); 1482 (void)m_free(m); 1483 } 1484 break; 1485 1486 case IPV6_PORTRANGE: 1487 error = sooptcopyin(sopt, &optval, 1488 sizeof optval, sizeof optval); 1489 if (error) 1490 break; 1491 1492 switch (optval) { 1493 case IPV6_PORTRANGE_DEFAULT: 1494 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1495 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1496 break; 1497 1498 case IPV6_PORTRANGE_HIGH: 1499 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1500 in6p->in6p_flags |= IN6P_HIGHPORT; 1501 break; 1502 1503 case IPV6_PORTRANGE_LOW: 1504 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1505 in6p->in6p_flags |= IN6P_LOWPORT; 1506 break; 1507 1508 default: 1509 error = EINVAL; 1510 break; 1511 } 1512 break; 1513 1514 #if defined(IPSEC) || defined(FAST_IPSEC) 1515 case IPV6_IPSEC_POLICY: 1516 { 1517 caddr_t req = NULL; 1518 size_t len = 0; 1519 struct mbuf *m; 1520 1521 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1522 break; 1523 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1524 break; 1525 if (m) { 1526 req = mtod(m, caddr_t); 1527 len = m->m_len; 1528 } 1529 error = ipsec6_set_policy(in6p, optname, req, 1530 len, privileged); 1531 m_freem(m); 1532 } 1533 break; 1534 #endif /* KAME IPSEC */ 1535 1536 case IPV6_FW_ADD: 1537 case IPV6_FW_DEL: 1538 case IPV6_FW_FLUSH: 1539 case IPV6_FW_ZERO: 1540 { 1541 struct mbuf *m; 1542 struct mbuf **mp = &m; 1543 1544 if (ip6_fw_ctl_ptr == NULL) 1545 return EINVAL; 1546 /* XXX */ 1547 if ((error = soopt_getm(sopt, &m)) != 0) 1548 break; 1549 /* XXX */ 1550 if ((error = soopt_mcopyin(sopt, m)) != 0) 1551 break; 1552 error = (*ip6_fw_ctl_ptr)(optname, mp); 1553 m = *mp; 1554 } 1555 break; 1556 1557 default: 1558 error = ENOPROTOOPT; 1559 break; 1560 } 1561 break; 1562 1563 case SOPT_GET: 1564 switch (optname) { 1565 1566 case IPV6_PKTOPTIONS: 1567 if (in6p->in6p_options) { 1568 struct mbuf *m; 1569 m = m_copym(in6p->in6p_options, 1570 0, M_COPYALL, MB_WAIT); 1571 error = soopt_mcopyout(sopt, m); 1572 if (error == 0) 1573 m_freem(m); 1574 } else 1575 sopt->sopt_valsize = 0; 1576 break; 1577 1578 case IPV6_UNICAST_HOPS: 1579 case IPV6_CHECKSUM: 1580 1581 case IPV6_FAITH: 1582 case IPV6_V6ONLY: 1583 case IPV6_PORTRANGE: 1584 switch (optname) { 1585 1586 case IPV6_UNICAST_HOPS: 1587 optval = in6p->in6p_hops; 1588 break; 1589 1590 case IPV6_CHECKSUM: 1591 optval = in6p->in6p_cksum; 1592 break; 1593 1594 case IPV6_FAITH: 1595 optval = OPTBIT(IN6P_FAITH); 1596 break; 1597 1598 case IPV6_V6ONLY: 1599 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1600 break; 1601 1602 case IPV6_PORTRANGE: 1603 { 1604 int flags; 1605 flags = in6p->in6p_flags; 1606 if (flags & IN6P_HIGHPORT) 1607 optval = IPV6_PORTRANGE_HIGH; 1608 else if (flags & IN6P_LOWPORT) 1609 optval = IPV6_PORTRANGE_LOW; 1610 else 1611 optval = 0; 1612 break; 1613 } 1614 } 1615 error = sooptcopyout(sopt, &optval, 1616 sizeof optval); 1617 break; 1618 1619 case IPV6_PKTINFO: 1620 case IPV6_HOPLIMIT: 1621 case IPV6_HOPOPTS: 1622 case IPV6_RTHDR: 1623 case IPV6_DSTOPTS: 1624 if (optname == IPV6_HOPOPTS || 1625 optname == IPV6_DSTOPTS || 1626 !privileged) 1627 return(EPERM); 1628 switch (optname) { 1629 case IPV6_PKTINFO: 1630 optval = OPTBIT(IN6P_PKTINFO); 1631 break; 1632 case IPV6_HOPLIMIT: 1633 optval = OPTBIT(IN6P_HOPLIMIT); 1634 break; 1635 case IPV6_HOPOPTS: 1636 if (!privileged) 1637 return(EPERM); 1638 optval = OPTBIT(IN6P_HOPOPTS); 1639 break; 1640 case IPV6_RTHDR: 1641 optval = OPTBIT(IN6P_RTHDR); 1642 break; 1643 case IPV6_DSTOPTS: 1644 if (!privileged) 1645 return(EPERM); 1646 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1647 break; 1648 } 1649 error = sooptcopyout(sopt, &optval, 1650 sizeof optval); 1651 break; 1652 1653 case IPV6_MULTICAST_IF: 1654 case IPV6_MULTICAST_HOPS: 1655 case IPV6_MULTICAST_LOOP: 1656 case IPV6_JOIN_GROUP: 1657 case IPV6_LEAVE_GROUP: 1658 { 1659 struct mbuf *m; 1660 error = ip6_getmoptions(sopt->sopt_name, 1661 in6p->in6p_moptions, &m); 1662 if (error == 0) 1663 error = sooptcopyout(sopt, 1664 mtod(m, char *), m->m_len); 1665 m_freem(m); 1666 } 1667 break; 1668 1669 #if defined(IPSEC) || defined(FAST_IPSEC) 1670 case IPV6_IPSEC_POLICY: 1671 { 1672 caddr_t req = NULL; 1673 size_t len = 0; 1674 struct mbuf *m = NULL; 1675 struct mbuf **mp = &m; 1676 1677 error = soopt_getm(sopt, &m); /* XXX */ 1678 if (error != NULL) 1679 break; 1680 error = soopt_mcopyin(sopt, m); /* XXX */ 1681 if (error != NULL) 1682 break; 1683 if (m) { 1684 req = mtod(m, caddr_t); 1685 len = m->m_len; 1686 } 1687 error = ipsec6_get_policy(in6p, req, len, mp); 1688 if (error == 0) 1689 error = soopt_mcopyout(sopt, m); /*XXX*/ 1690 if (error == 0 && m) 1691 m_freem(m); 1692 break; 1693 } 1694 #endif /* KAME IPSEC */ 1695 1696 case IPV6_FW_GET: 1697 { 1698 struct mbuf *m; 1699 struct mbuf **mp = &m; 1700 1701 if (ip6_fw_ctl_ptr == NULL) 1702 { 1703 return EINVAL; 1704 } 1705 error = (*ip6_fw_ctl_ptr)(optname, mp); 1706 if (error == 0) 1707 error = soopt_mcopyout(sopt, m); /* XXX */ 1708 if (error == 0 && m) 1709 m_freem(m); 1710 } 1711 break; 1712 1713 default: 1714 error = ENOPROTOOPT; 1715 break; 1716 } 1717 break; 1718 } 1719 } else { 1720 error = EINVAL; 1721 } 1722 return(error); 1723 } 1724 1725 /* 1726 * Set up IP6 options in pcb for insertion in output packets or 1727 * specifying behavior of outgoing packets. 1728 */ 1729 static int 1730 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, struct socket *so, 1731 struct sockopt *sopt) 1732 { 1733 struct ip6_pktopts *opt = *pktopt; 1734 int error = 0; 1735 struct thread *td = sopt->sopt_td; 1736 int priv = 0; 1737 1738 /* turn off any old options. */ 1739 if (opt) { 1740 #ifdef DIAGNOSTIC 1741 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1742 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1743 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1744 printf("ip6_pcbopts: all specified options are cleared.\n"); 1745 #endif 1746 ip6_clearpktopts(opt, 1, -1); 1747 } else 1748 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1749 *pktopt = NULL; 1750 1751 if (!m || m->m_len == 0) { 1752 /* 1753 * Only turning off any previous options, regardless of 1754 * whether the opt is just created or given. 1755 */ 1756 free(opt, M_IP6OPT); 1757 return(0); 1758 } 1759 1760 /* set options specified by user. */ 1761 if (suser(td) == 0) 1762 priv = 1; 1763 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1764 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1765 free(opt, M_IP6OPT); 1766 return(error); 1767 } 1768 *pktopt = opt; 1769 return(0); 1770 } 1771 1772 /* 1773 * initialize ip6_pktopts. beware that there are non-zero default values in 1774 * the struct. 1775 */ 1776 void 1777 init_ip6pktopts(struct ip6_pktopts *opt) 1778 { 1779 1780 bzero(opt, sizeof(*opt)); 1781 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1782 } 1783 1784 void 1785 ip6_clearpktopts(struct ip6_pktopts *pktopt, int needfree, int optname) 1786 { 1787 if (pktopt == NULL) 1788 return; 1789 1790 if (optname == -1) { 1791 if (needfree && pktopt->ip6po_pktinfo) 1792 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1793 pktopt->ip6po_pktinfo = NULL; 1794 } 1795 if (optname == -1) 1796 pktopt->ip6po_hlim = -1; 1797 if (optname == -1) { 1798 if (needfree && pktopt->ip6po_nexthop) 1799 free(pktopt->ip6po_nexthop, M_IP6OPT); 1800 pktopt->ip6po_nexthop = NULL; 1801 } 1802 if (optname == -1) { 1803 if (needfree && pktopt->ip6po_hbh) 1804 free(pktopt->ip6po_hbh, M_IP6OPT); 1805 pktopt->ip6po_hbh = NULL; 1806 } 1807 if (optname == -1) { 1808 if (needfree && pktopt->ip6po_dest1) 1809 free(pktopt->ip6po_dest1, M_IP6OPT); 1810 pktopt->ip6po_dest1 = NULL; 1811 } 1812 if (optname == -1) { 1813 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1814 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1815 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1816 if (pktopt->ip6po_route.ro_rt) { 1817 RTFREE(pktopt->ip6po_route.ro_rt); 1818 pktopt->ip6po_route.ro_rt = NULL; 1819 } 1820 } 1821 if (optname == -1) { 1822 if (needfree && pktopt->ip6po_dest2) 1823 free(pktopt->ip6po_dest2, M_IP6OPT); 1824 pktopt->ip6po_dest2 = NULL; 1825 } 1826 } 1827 1828 #define PKTOPT_EXTHDRCPY(type) \ 1829 do {\ 1830 if (src->type) {\ 1831 int hlen =\ 1832 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1833 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1834 if (dst->type == NULL && canwait == M_NOWAIT)\ 1835 goto bad;\ 1836 bcopy(src->type, dst->type, hlen);\ 1837 }\ 1838 } while (0) 1839 1840 struct ip6_pktopts * 1841 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 1842 { 1843 struct ip6_pktopts *dst; 1844 1845 if (src == NULL) { 1846 printf("ip6_clearpktopts: invalid argument\n"); 1847 return(NULL); 1848 } 1849 1850 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1851 if (dst == NULL && canwait == M_NOWAIT) 1852 return (NULL); 1853 bzero(dst, sizeof(*dst)); 1854 1855 dst->ip6po_hlim = src->ip6po_hlim; 1856 if (src->ip6po_pktinfo) { 1857 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1858 M_IP6OPT, canwait); 1859 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1860 goto bad; 1861 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1862 } 1863 if (src->ip6po_nexthop) { 1864 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1865 M_IP6OPT, canwait); 1866 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1867 goto bad; 1868 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1869 src->ip6po_nexthop->sa_len); 1870 } 1871 PKTOPT_EXTHDRCPY(ip6po_hbh); 1872 PKTOPT_EXTHDRCPY(ip6po_dest1); 1873 PKTOPT_EXTHDRCPY(ip6po_dest2); 1874 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1875 return(dst); 1876 1877 bad: 1878 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1879 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1880 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1881 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1882 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1883 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1884 free(dst, M_IP6OPT); 1885 return(NULL); 1886 } 1887 #undef PKTOPT_EXTHDRCPY 1888 1889 void 1890 ip6_freepcbopts(struct ip6_pktopts *pktopt) 1891 { 1892 if (pktopt == NULL) 1893 return; 1894 1895 ip6_clearpktopts(pktopt, 1, -1); 1896 1897 free(pktopt, M_IP6OPT); 1898 } 1899 1900 /* 1901 * Set the IP6 multicast options in response to user setsockopt(). 1902 */ 1903 static int 1904 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 1905 { 1906 int error = 0; 1907 u_int loop, ifindex; 1908 struct ipv6_mreq *mreq; 1909 struct ifnet *ifp; 1910 struct ip6_moptions *im6o = *im6op; 1911 struct route_in6 ro; 1912 struct sockaddr_in6 *dst; 1913 struct in6_multi_mship *imm; 1914 struct thread *td = curthread; /* XXX */ 1915 1916 if (im6o == NULL) { 1917 /* 1918 * No multicast option buffer attached to the pcb; 1919 * allocate one and initialize to default values. 1920 */ 1921 im6o = (struct ip6_moptions *) 1922 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1923 1924 if (im6o == NULL) 1925 return(ENOBUFS); 1926 *im6op = im6o; 1927 im6o->im6o_multicast_ifp = NULL; 1928 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1929 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1930 LIST_INIT(&im6o->im6o_memberships); 1931 } 1932 1933 switch (optname) { 1934 1935 case IPV6_MULTICAST_IF: 1936 /* 1937 * Select the interface for outgoing multicast packets. 1938 */ 1939 if (m == NULL || m->m_len != sizeof(u_int)) { 1940 error = EINVAL; 1941 break; 1942 } 1943 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1944 if (ifindex < 0 || if_index < ifindex) { 1945 error = ENXIO; /* XXX EINVAL? */ 1946 break; 1947 } 1948 ifp = ifindex2ifnet[ifindex]; 1949 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1950 error = EADDRNOTAVAIL; 1951 break; 1952 } 1953 im6o->im6o_multicast_ifp = ifp; 1954 break; 1955 1956 case IPV6_MULTICAST_HOPS: 1957 { 1958 /* 1959 * Set the IP6 hoplimit for outgoing multicast packets. 1960 */ 1961 int optval; 1962 if (m == NULL || m->m_len != sizeof(int)) { 1963 error = EINVAL; 1964 break; 1965 } 1966 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1967 if (optval < -1 || optval >= 256) 1968 error = EINVAL; 1969 else if (optval == -1) 1970 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1971 else 1972 im6o->im6o_multicast_hlim = optval; 1973 break; 1974 } 1975 1976 case IPV6_MULTICAST_LOOP: 1977 /* 1978 * Set the loopback flag for outgoing multicast packets. 1979 * Must be zero or one. 1980 */ 1981 if (m == NULL || m->m_len != sizeof(u_int)) { 1982 error = EINVAL; 1983 break; 1984 } 1985 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1986 if (loop > 1) { 1987 error = EINVAL; 1988 break; 1989 } 1990 im6o->im6o_multicast_loop = loop; 1991 break; 1992 1993 case IPV6_JOIN_GROUP: 1994 /* 1995 * Add a multicast group membership. 1996 * Group must be a valid IP6 multicast address. 1997 */ 1998 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1999 error = EINVAL; 2000 break; 2001 } 2002 mreq = mtod(m, struct ipv6_mreq *); 2003 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2004 /* 2005 * We use the unspecified address to specify to accept 2006 * all multicast addresses. Only super user is allowed 2007 * to do this. 2008 */ 2009 if (suser(td)) 2010 { 2011 error = EACCES; 2012 break; 2013 } 2014 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2015 error = EINVAL; 2016 break; 2017 } 2018 2019 /* 2020 * If the interface is specified, validate it. 2021 */ 2022 if (mreq->ipv6mr_interface < 0 2023 || if_index < mreq->ipv6mr_interface) { 2024 error = ENXIO; /* XXX EINVAL? */ 2025 break; 2026 } 2027 /* 2028 * If no interface was explicitly specified, choose an 2029 * appropriate one according to the given multicast address. 2030 */ 2031 if (mreq->ipv6mr_interface == 0) { 2032 /* 2033 * If the multicast address is in node-local scope, 2034 * the interface should be a loopback interface. 2035 * Otherwise, look up the routing table for the 2036 * address, and choose the outgoing interface. 2037 * XXX: is it a good approach? 2038 */ 2039 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2040 ifp = &loif[0]; 2041 } else { 2042 ro.ro_rt = NULL; 2043 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2044 bzero(dst, sizeof(*dst)); 2045 dst->sin6_len = sizeof(struct sockaddr_in6); 2046 dst->sin6_family = AF_INET6; 2047 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2048 rtalloc((struct route *)&ro); 2049 if (ro.ro_rt == NULL) { 2050 error = EADDRNOTAVAIL; 2051 break; 2052 } 2053 ifp = ro.ro_rt->rt_ifp; 2054 rtfree(ro.ro_rt); 2055 } 2056 } else 2057 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2058 2059 /* 2060 * See if we found an interface, and confirm that it 2061 * supports multicast 2062 */ 2063 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2064 error = EADDRNOTAVAIL; 2065 break; 2066 } 2067 /* 2068 * Put interface index into the multicast address, 2069 * if the address has link-local scope. 2070 */ 2071 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2072 mreq->ipv6mr_multiaddr.s6_addr16[1] 2073 = htons(mreq->ipv6mr_interface); 2074 } 2075 /* 2076 * See if the membership already exists. 2077 */ 2078 for (imm = im6o->im6o_memberships.lh_first; 2079 imm != NULL; imm = imm->i6mm_chain.le_next) 2080 if (imm->i6mm_maddr->in6m_ifp == ifp && 2081 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2082 &mreq->ipv6mr_multiaddr)) 2083 break; 2084 if (imm != NULL) { 2085 error = EADDRINUSE; 2086 break; 2087 } 2088 /* 2089 * Everything looks good; add a new record to the multicast 2090 * address list for the given interface. 2091 */ 2092 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2093 if (imm == NULL) { 2094 error = ENOBUFS; 2095 break; 2096 } 2097 if ((imm->i6mm_maddr = 2098 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2099 free(imm, M_IPMADDR); 2100 break; 2101 } 2102 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2103 break; 2104 2105 case IPV6_LEAVE_GROUP: 2106 /* 2107 * Drop a multicast group membership. 2108 * Group must be a valid IP6 multicast address. 2109 */ 2110 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2111 error = EINVAL; 2112 break; 2113 } 2114 mreq = mtod(m, struct ipv6_mreq *); 2115 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2116 if (suser(td)) { 2117 error = EACCES; 2118 break; 2119 } 2120 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2121 error = EINVAL; 2122 break; 2123 } 2124 /* 2125 * If an interface address was specified, get a pointer 2126 * to its ifnet structure. 2127 */ 2128 if (mreq->ipv6mr_interface < 0 2129 || if_index < mreq->ipv6mr_interface) { 2130 error = ENXIO; /* XXX EINVAL? */ 2131 break; 2132 } 2133 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2134 /* 2135 * Put interface index into the multicast address, 2136 * if the address has link-local scope. 2137 */ 2138 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2139 mreq->ipv6mr_multiaddr.s6_addr16[1] 2140 = htons(mreq->ipv6mr_interface); 2141 } 2142 /* 2143 * Find the membership in the membership list. 2144 */ 2145 for (imm = im6o->im6o_memberships.lh_first; 2146 imm != NULL; imm = imm->i6mm_chain.le_next) { 2147 if ((ifp == NULL || 2148 imm->i6mm_maddr->in6m_ifp == ifp) && 2149 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2150 &mreq->ipv6mr_multiaddr)) 2151 break; 2152 } 2153 if (imm == NULL) { 2154 /* Unable to resolve interface */ 2155 error = EADDRNOTAVAIL; 2156 break; 2157 } 2158 /* 2159 * Give up the multicast address record to which the 2160 * membership points. 2161 */ 2162 LIST_REMOVE(imm, i6mm_chain); 2163 in6_delmulti(imm->i6mm_maddr); 2164 free(imm, M_IPMADDR); 2165 break; 2166 2167 default: 2168 error = EOPNOTSUPP; 2169 break; 2170 } 2171 2172 /* 2173 * If all options have default values, no need to keep the mbuf. 2174 */ 2175 if (im6o->im6o_multicast_ifp == NULL && 2176 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2177 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2178 im6o->im6o_memberships.lh_first == NULL) { 2179 free(*im6op, M_IPMOPTS); 2180 *im6op = NULL; 2181 } 2182 2183 return(error); 2184 } 2185 2186 /* 2187 * Return the IP6 multicast options in response to user getsockopt(). 2188 */ 2189 static int 2190 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2191 { 2192 u_int *hlim, *loop, *ifindex; 2193 2194 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2195 2196 switch (optname) { 2197 2198 case IPV6_MULTICAST_IF: 2199 ifindex = mtod(*mp, u_int *); 2200 (*mp)->m_len = sizeof(u_int); 2201 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2202 *ifindex = 0; 2203 else 2204 *ifindex = im6o->im6o_multicast_ifp->if_index; 2205 return(0); 2206 2207 case IPV6_MULTICAST_HOPS: 2208 hlim = mtod(*mp, u_int *); 2209 (*mp)->m_len = sizeof(u_int); 2210 if (im6o == NULL) 2211 *hlim = ip6_defmcasthlim; 2212 else 2213 *hlim = im6o->im6o_multicast_hlim; 2214 return(0); 2215 2216 case IPV6_MULTICAST_LOOP: 2217 loop = mtod(*mp, u_int *); 2218 (*mp)->m_len = sizeof(u_int); 2219 if (im6o == NULL) 2220 *loop = ip6_defmcasthlim; 2221 else 2222 *loop = im6o->im6o_multicast_loop; 2223 return(0); 2224 2225 default: 2226 return(EOPNOTSUPP); 2227 } 2228 } 2229 2230 /* 2231 * Discard the IP6 multicast options. 2232 */ 2233 void 2234 ip6_freemoptions(struct ip6_moptions *im6o) 2235 { 2236 struct in6_multi_mship *imm; 2237 2238 if (im6o == NULL) 2239 return; 2240 2241 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2242 LIST_REMOVE(imm, i6mm_chain); 2243 if (imm->i6mm_maddr) 2244 in6_delmulti(imm->i6mm_maddr); 2245 free(imm, M_IPMADDR); 2246 } 2247 free(im6o, M_IPMOPTS); 2248 } 2249 2250 /* 2251 * Set IPv6 outgoing packet options based on advanced API. 2252 */ 2253 int 2254 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, int priv, 2255 int needcopy) 2256 { 2257 struct cmsghdr *cm = 0; 2258 2259 if (control == 0 || opt == 0) 2260 return(EINVAL); 2261 2262 init_ip6pktopts(opt); 2263 2264 /* 2265 * XXX: Currently, we assume all the optional information is stored 2266 * in a single mbuf. 2267 */ 2268 if (control->m_next) 2269 return(EINVAL); 2270 2271 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2272 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2273 cm = mtod(control, struct cmsghdr *); 2274 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2275 return(EINVAL); 2276 if (cm->cmsg_level != IPPROTO_IPV6) 2277 continue; 2278 2279 /* 2280 * XXX should check if RFC2292 API is mixed with 2292bis API 2281 */ 2282 switch (cm->cmsg_type) { 2283 case IPV6_PKTINFO: 2284 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2285 return(EINVAL); 2286 if (needcopy) { 2287 /* XXX: Is it really WAITOK? */ 2288 opt->ip6po_pktinfo = 2289 malloc(sizeof(struct in6_pktinfo), 2290 M_IP6OPT, M_WAITOK); 2291 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2292 sizeof(struct in6_pktinfo)); 2293 } else 2294 opt->ip6po_pktinfo = 2295 (struct in6_pktinfo *)CMSG_DATA(cm); 2296 if (opt->ip6po_pktinfo->ipi6_ifindex && 2297 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2298 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2299 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2300 2301 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2302 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2303 return(ENXIO); 2304 } 2305 2306 /* 2307 * Check if the requested source address is indeed a 2308 * unicast address assigned to the node, and can be 2309 * used as the packet's source address. 2310 */ 2311 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2312 struct in6_ifaddr *ia6; 2313 struct sockaddr_in6 sin6; 2314 2315 bzero(&sin6, sizeof(sin6)); 2316 sin6.sin6_len = sizeof(sin6); 2317 sin6.sin6_family = AF_INET6; 2318 sin6.sin6_addr = 2319 opt->ip6po_pktinfo->ipi6_addr; 2320 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2321 if (ia6 == NULL || 2322 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2323 IN6_IFF_NOTREADY)) != 0) 2324 return(EADDRNOTAVAIL); 2325 } 2326 break; 2327 2328 case IPV6_HOPLIMIT: 2329 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2330 return(EINVAL); 2331 2332 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2333 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2334 return(EINVAL); 2335 break; 2336 2337 case IPV6_NEXTHOP: 2338 if (!priv) 2339 return(EPERM); 2340 2341 if (cm->cmsg_len < sizeof(u_char) || 2342 /* check if cmsg_len is large enough for sa_len */ 2343 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2344 return(EINVAL); 2345 2346 if (needcopy) { 2347 opt->ip6po_nexthop = 2348 malloc(*CMSG_DATA(cm), 2349 M_IP6OPT, M_WAITOK); 2350 bcopy(CMSG_DATA(cm), 2351 opt->ip6po_nexthop, 2352 *CMSG_DATA(cm)); 2353 } else 2354 opt->ip6po_nexthop = 2355 (struct sockaddr *)CMSG_DATA(cm); 2356 break; 2357 2358 case IPV6_HOPOPTS: 2359 { 2360 struct ip6_hbh *hbh; 2361 int hbhlen; 2362 2363 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2364 return(EINVAL); 2365 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2366 hbhlen = (hbh->ip6h_len + 1) << 3; 2367 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2368 return(EINVAL); 2369 2370 if (needcopy) { 2371 opt->ip6po_hbh = 2372 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2373 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2374 } else 2375 opt->ip6po_hbh = hbh; 2376 break; 2377 } 2378 2379 case IPV6_DSTOPTS: 2380 { 2381 struct ip6_dest *dest, **newdest; 2382 int destlen; 2383 2384 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2385 return(EINVAL); 2386 dest = (struct ip6_dest *)CMSG_DATA(cm); 2387 destlen = (dest->ip6d_len + 1) << 3; 2388 if (cm->cmsg_len != CMSG_LEN(destlen)) 2389 return(EINVAL); 2390 2391 /* 2392 * The old advacned API is ambiguous on this 2393 * point. Our approach is to determine the 2394 * position based according to the existence 2395 * of a routing header. Note, however, that 2396 * this depends on the order of the extension 2397 * headers in the ancillary data; the 1st part 2398 * of the destination options header must 2399 * appear before the routing header in the 2400 * ancillary data, too. 2401 * RFC2292bis solved the ambiguity by 2402 * introducing separate cmsg types. 2403 */ 2404 if (opt->ip6po_rthdr == NULL) 2405 newdest = &opt->ip6po_dest1; 2406 else 2407 newdest = &opt->ip6po_dest2; 2408 2409 if (needcopy) { 2410 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2411 bcopy(dest, *newdest, destlen); 2412 } else 2413 *newdest = dest; 2414 2415 break; 2416 } 2417 2418 case IPV6_RTHDR: 2419 { 2420 struct ip6_rthdr *rth; 2421 int rthlen; 2422 2423 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2424 return(EINVAL); 2425 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2426 rthlen = (rth->ip6r_len + 1) << 3; 2427 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2428 return(EINVAL); 2429 2430 switch (rth->ip6r_type) { 2431 case IPV6_RTHDR_TYPE_0: 2432 /* must contain one addr */ 2433 if (rth->ip6r_len == 0) 2434 return(EINVAL); 2435 /* length must be even */ 2436 if (rth->ip6r_len % 2) 2437 return(EINVAL); 2438 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2439 return(EINVAL); 2440 break; 2441 default: 2442 return(EINVAL); /* not supported */ 2443 } 2444 2445 if (needcopy) { 2446 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2447 M_WAITOK); 2448 bcopy(rth, opt->ip6po_rthdr, rthlen); 2449 } else 2450 opt->ip6po_rthdr = rth; 2451 2452 break; 2453 } 2454 2455 default: 2456 return(ENOPROTOOPT); 2457 } 2458 } 2459 2460 return(0); 2461 } 2462 2463 /* 2464 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2465 * packet to the input queue of a specified interface. Note that this 2466 * calls the output routine of the loopback "driver", but with an interface 2467 * pointer that might NOT be &loif -- easier than replicating that code here. 2468 */ 2469 void 2470 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2471 { 2472 struct mbuf *copym; 2473 struct ip6_hdr *ip6; 2474 2475 copym = m_copy(m, 0, M_COPYALL); 2476 if (copym == NULL) 2477 return; 2478 2479 /* 2480 * Make sure to deep-copy IPv6 header portion in case the data 2481 * is in an mbuf cluster, so that we can safely override the IPv6 2482 * header portion later. 2483 */ 2484 if ((copym->m_flags & M_EXT) != 0 || 2485 copym->m_len < sizeof(struct ip6_hdr)) { 2486 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2487 if (copym == NULL) 2488 return; 2489 } 2490 2491 #ifdef DIAGNOSTIC 2492 if (copym->m_len < sizeof(*ip6)) { 2493 m_freem(copym); 2494 return; 2495 } 2496 #endif 2497 2498 ip6 = mtod(copym, struct ip6_hdr *); 2499 #ifndef SCOPEDROUTING 2500 /* 2501 * clear embedded scope identifiers if necessary. 2502 * in6_clearscope will touch the addresses only when necessary. 2503 */ 2504 in6_clearscope(&ip6->ip6_src); 2505 in6_clearscope(&ip6->ip6_dst); 2506 #endif 2507 2508 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2509 } 2510 2511 /* 2512 * Chop IPv6 header off from the payload. 2513 */ 2514 static int 2515 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2516 { 2517 struct mbuf *mh; 2518 struct ip6_hdr *ip6; 2519 2520 ip6 = mtod(m, struct ip6_hdr *); 2521 if (m->m_len > sizeof(*ip6)) { 2522 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 2523 if (mh == 0) { 2524 m_freem(m); 2525 return ENOBUFS; 2526 } 2527 M_MOVE_PKTHDR(mh, m); 2528 MH_ALIGN(mh, sizeof(*ip6)); 2529 m->m_len -= sizeof(*ip6); 2530 m->m_data += sizeof(*ip6); 2531 mh->m_next = m; 2532 m = mh; 2533 m->m_len = sizeof(*ip6); 2534 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2535 } 2536 exthdrs->ip6e_ip6 = m; 2537 return 0; 2538 } 2539 2540 /* 2541 * Compute IPv6 extension header length. 2542 */ 2543 int 2544 ip6_optlen(struct in6pcb *in6p) 2545 { 2546 int len; 2547 2548 if (!in6p->in6p_outputopts) 2549 return 0; 2550 2551 len = 0; 2552 #define elen(x) \ 2553 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2554 2555 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2556 if (in6p->in6p_outputopts->ip6po_rthdr) 2557 /* dest1 is valid with rthdr only */ 2558 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2559 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2560 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2561 return len; 2562 #undef elen 2563 } 2564