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 1.37 2008/09/04 09:08:22 hasso 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 #include <sys/priv.h> 85 86 #include <sys/thread2.h> 87 #include <sys/msgport2.h> 88 89 #include <net/if.h> 90 #include <net/route.h> 91 #include <net/pfil.h> 92 93 #include <netinet/in.h> 94 #include <netinet/in_var.h> 95 #include <netinet6/in6_var.h> 96 #include <netinet/ip6.h> 97 #include <netinet/icmp6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet/in_pcb.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/ip6protosw.h> 102 103 #ifdef IPSEC 104 #include <netinet6/ipsec.h> 105 #ifdef INET6 106 #include <netinet6/ipsec6.h> 107 #endif 108 #include <netproto/key/key.h> 109 #endif /* IPSEC */ 110 111 #ifdef FAST_IPSEC 112 #include <netproto/ipsec/ipsec.h> 113 #include <netproto/ipsec/ipsec6.h> 114 #include <netproto/ipsec/key.h> 115 #endif 116 117 #include <net/ip6fw/ip6_fw.h> 118 119 #include <net/net_osdep.h> 120 121 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 122 123 struct ip6_exthdrs { 124 struct mbuf *ip6e_ip6; 125 struct mbuf *ip6e_hbh; 126 struct mbuf *ip6e_dest1; 127 struct mbuf *ip6e_rthdr; 128 struct mbuf *ip6e_dest2; 129 }; 130 131 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 132 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 133 int, int, int, int); 134 static int ip6_pcbopts (struct ip6_pktopts **, struct mbuf *, 135 struct socket *, struct sockopt *); 136 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 137 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 138 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 139 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 140 struct ifnet *, struct in6_addr *, u_long *, int *); 141 static int copyexthdr (void *, struct mbuf **); 142 static int ip6_insertfraghdr (struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 145 static struct mbuf *ip6_splithdr (struct mbuf *); 146 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 147 148 /* 149 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 150 * header (with pri, len, nxt, hlim, src, dst). 151 * This function may modify ver and hlim only. 152 * The mbuf chain containing the packet will be freed. 153 * The mbuf opt, if present, will not be freed. 154 * 155 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 156 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 157 * which is rt_rmx.rmx_mtu. 158 */ 159 int 160 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 161 int flags, struct ip6_moptions *im6o, 162 struct ifnet **ifpp, /* XXX: just for statistics */ 163 struct inpcb *inp) 164 { 165 struct ip6_hdr *ip6, *mhip6; 166 struct ifnet *ifp, *origifp; 167 struct mbuf *m = m0; 168 struct mbuf *mprev; 169 u_char *nexthdrp; 170 int hlen, tlen, len, off; 171 struct route_in6 ip6route; 172 struct sockaddr_in6 *dst; 173 int error = 0; 174 struct in6_ifaddr *ia = NULL; 175 u_long mtu; 176 int alwaysfrag, dontfrag; 177 u_int32_t optlen, plen = 0, unfragpartlen; 178 struct ip6_exthdrs exthdrs; 179 struct in6_addr finaldst; 180 struct route_in6 *ro_pmtu = NULL; 181 boolean_t hdrsplit = FALSE; 182 boolean_t needipsec = FALSE; 183 #ifdef IPSEC 184 boolean_t needipsectun = FALSE; 185 struct secpolicy *sp = NULL; 186 struct socket *so = inp ? inp->inp_socket : NULL; 187 188 ip6 = mtod(m, struct ip6_hdr *); 189 #endif 190 #ifdef FAST_IPSEC 191 boolean_t needipsectun = FALSE; 192 struct secpolicy *sp = NULL; 193 194 ip6 = mtod(m, struct ip6_hdr *); 195 #endif 196 197 bzero(&exthdrs, sizeof exthdrs); 198 199 if (opt) { 200 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 201 goto freehdrs; 202 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 203 goto freehdrs; 204 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 205 goto freehdrs; 206 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 207 goto freehdrs; 208 } 209 210 #ifdef IPSEC 211 /* get a security policy for this packet */ 212 if (so == NULL) 213 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 214 else 215 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 216 217 if (sp == NULL) { 218 ipsec6stat.out_inval++; 219 goto freehdrs; 220 } 221 222 error = 0; 223 224 /* check policy */ 225 switch (sp->policy) { 226 case IPSEC_POLICY_DISCARD: 227 /* 228 * This packet is just discarded. 229 */ 230 ipsec6stat.out_polvio++; 231 goto freehdrs; 232 233 case IPSEC_POLICY_BYPASS: 234 case IPSEC_POLICY_NONE: 235 /* no need to do IPsec. */ 236 needipsec = FALSE; 237 break; 238 239 case IPSEC_POLICY_IPSEC: 240 if (sp->req == NULL) { 241 error = key_spdacquire(sp); /* acquire a policy */ 242 goto freehdrs; 243 } 244 needipsec = TRUE; 245 break; 246 247 case IPSEC_POLICY_ENTRUST: 248 default: 249 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 250 } 251 #endif /* IPSEC */ 252 #ifdef FAST_IPSEC 253 /* get a security policy for this packet */ 254 if (inp == NULL) 255 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 256 else 257 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 258 259 if (sp == NULL) { 260 newipsecstat.ips_out_inval++; 261 goto freehdrs; 262 } 263 264 error = 0; 265 266 /* check policy */ 267 switch (sp->policy) { 268 case IPSEC_POLICY_DISCARD: 269 /* 270 * This packet is just discarded. 271 */ 272 newipsecstat.ips_out_polvio++; 273 goto freehdrs; 274 275 case IPSEC_POLICY_BYPASS: 276 case IPSEC_POLICY_NONE: 277 /* no need to do IPsec. */ 278 needipsec = FALSE; 279 break; 280 281 case IPSEC_POLICY_IPSEC: 282 if (sp->req == NULL) { 283 error = key_spdacquire(sp); /* acquire a policy */ 284 goto freehdrs; 285 } 286 needipsec = TRUE; 287 break; 288 289 case IPSEC_POLICY_ENTRUST: 290 default: 291 kprintf("ip6_output: Invalid policy found. %d\n", sp->policy); 292 } 293 #endif /* FAST_IPSEC */ 294 295 /* 296 * Calculate the total length of the extension header chain. 297 * Keep the length of the unfragmentable part for fragmentation. 298 */ 299 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 300 m_lengthm(exthdrs.ip6e_dest1, NULL) + 301 m_lengthm(exthdrs.ip6e_rthdr, NULL); 302 303 unfragpartlen = optlen + sizeof(struct ip6_hdr); 304 305 /* NOTE: we don't add AH/ESP length here. do that later. */ 306 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 307 308 /* 309 * If we need IPsec, or there is at least one extension header, 310 * separate IP6 header from the payload. 311 */ 312 if ((needipsec || optlen) && !hdrsplit) { 313 exthdrs.ip6e_ip6 = ip6_splithdr(m); 314 if (exthdrs.ip6e_ip6 == NULL) { 315 error = ENOBUFS; 316 goto freehdrs; 317 } 318 m = exthdrs.ip6e_ip6; 319 hdrsplit = TRUE; 320 } 321 322 /* adjust pointer */ 323 ip6 = mtod(m, struct ip6_hdr *); 324 325 /* adjust mbuf packet header length */ 326 m->m_pkthdr.len += optlen; 327 plen = m->m_pkthdr.len - sizeof(*ip6); 328 329 /* If this is a jumbo payload, insert a jumbo payload option. */ 330 if (plen > IPV6_MAXPACKET) { 331 if (!hdrsplit) { 332 exthdrs.ip6e_ip6 = ip6_splithdr(m); 333 if (exthdrs.ip6e_ip6 == NULL) { 334 error = ENOBUFS; 335 goto freehdrs; 336 } 337 m = exthdrs.ip6e_ip6; 338 hdrsplit = TRUE; 339 } 340 /* adjust pointer */ 341 ip6 = mtod(m, struct ip6_hdr *); 342 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 343 goto freehdrs; 344 ip6->ip6_plen = 0; 345 } else 346 ip6->ip6_plen = htons(plen); 347 348 /* 349 * Concatenate headers and fill in next header fields. 350 * Here we have, on "m" 351 * IPv6 payload 352 * and we insert headers accordingly. Finally, we should be getting: 353 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 354 * 355 * during the header composing process, "m" points to IPv6 header. 356 * "mprev" points to an extension header prior to esp. 357 */ 358 359 nexthdrp = &ip6->ip6_nxt; 360 mprev = m; 361 362 /* 363 * we treat dest2 specially. this makes IPsec processing 364 * much easier. the goal here is to make mprev point the 365 * mbuf prior to dest2. 366 * 367 * result: IPv6 dest2 payload 368 * m and mprev will point to IPv6 header. 369 */ 370 if (exthdrs.ip6e_dest2) { 371 if (!hdrsplit) 372 panic("assumption failed: hdr not split"); 373 exthdrs.ip6e_dest2->m_next = m->m_next; 374 m->m_next = exthdrs.ip6e_dest2; 375 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 376 ip6->ip6_nxt = IPPROTO_DSTOPTS; 377 } 378 379 /* 380 * Place m1 after mprev. 381 */ 382 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 383 do {\ 384 if (m1) {\ 385 if (!hdrsplit)\ 386 panic("assumption failed: hdr not split");\ 387 *mtod(m1, u_char *) = *nexthdrp;\ 388 *nexthdrp = (i);\ 389 nexthdrp = mtod(m1, u_char *);\ 390 m1->m_next = mprev->m_next;\ 391 mprev->m_next = m1;\ 392 mprev = m1;\ 393 }\ 394 } while (0) 395 396 /* 397 * result: IPv6 hbh dest1 rthdr dest2 payload 398 * m will point to IPv6 header. mprev will point to the 399 * extension header prior to dest2 (rthdr in the above case). 400 */ 401 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 402 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 403 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 404 405 #if defined(IPSEC) || defined(FAST_IPSEC) 406 if (needipsec) { 407 struct ipsec_output_state state; 408 int segleft_org = 0; 409 struct ip6_rthdr *rh = NULL; 410 411 /* 412 * pointers after IPsec headers are not valid any more. 413 * other pointers need a great care too. 414 * (IPsec routines should not mangle mbufs prior to AH/ESP) 415 */ 416 exthdrs.ip6e_dest2 = NULL; 417 418 if (exthdrs.ip6e_rthdr) { 419 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 420 segleft_org = rh->ip6r_segleft; 421 rh->ip6r_segleft = 0; 422 } 423 424 bzero(&state, sizeof state); 425 state.m = m; 426 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 427 &needipsectun); 428 m = state.m; 429 if (error) { 430 /* mbuf is already reclaimed in ipsec6_output_trans. */ 431 m = NULL; 432 switch (error) { 433 case EHOSTUNREACH: 434 case ENETUNREACH: 435 case EMSGSIZE: 436 case ENOBUFS: 437 case ENOMEM: 438 break; 439 default: 440 kprintf("ip6_output (ipsec): error code %d\n", 441 error); 442 /* fall through */ 443 case ENOENT: 444 /* don't show these error codes to the user */ 445 error = 0; 446 break; 447 } 448 goto bad; 449 } 450 if (exthdrs.ip6e_rthdr) { 451 /* ah6_output doesn't modify mbuf chain */ 452 rh->ip6r_segleft = segleft_org; 453 } 454 } 455 #endif 456 457 /* 458 * If there is a routing header, replace destination address field 459 * with the first hop of the routing header. 460 */ 461 if (exthdrs.ip6e_rthdr) { 462 struct ip6_rthdr *rh; 463 464 finaldst = ip6->ip6_dst; 465 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 466 switch (rh->ip6r_type) { 467 default: /* is it possible? */ 468 error = EINVAL; 469 goto bad; 470 } 471 } 472 473 /* Source address validation */ 474 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 475 !(flags & IPV6_DADOUTPUT)) { 476 error = EOPNOTSUPP; 477 ip6stat.ip6s_badscope++; 478 goto bad; 479 } 480 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 481 error = EOPNOTSUPP; 482 ip6stat.ip6s_badscope++; 483 goto bad; 484 } 485 486 ip6stat.ip6s_localout++; 487 488 /* 489 * Route packet. 490 */ 491 if (ro == NULL) { 492 ro = &ip6route; 493 bzero(ro, sizeof(*ro)); 494 } 495 ro_pmtu = ro; 496 if (opt && opt->ip6po_rthdr) 497 ro = &opt->ip6po_route; 498 dst = (struct sockaddr_in6 *)&ro->ro_dst; 499 /* 500 * If there is a cached route, 501 * check that it is to the same destination 502 * and is still up. If not, free it and try again. 503 */ 504 if (ro->ro_rt != NULL && 505 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 506 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 507 RTFREE(ro->ro_rt); 508 ro->ro_rt = NULL; 509 } 510 if (ro->ro_rt == NULL) { 511 bzero(dst, sizeof(*dst)); 512 dst->sin6_family = AF_INET6; 513 dst->sin6_len = sizeof(struct sockaddr_in6); 514 dst->sin6_addr = ip6->ip6_dst; 515 } 516 #if defined(IPSEC) || defined(FAST_IPSEC) 517 if (needipsec && needipsectun) { 518 struct ipsec_output_state state; 519 520 /* 521 * All the extension headers will become inaccessible 522 * (since they can be encrypted). 523 * Don't panic, we need no more updates to extension headers 524 * on inner IPv6 packet (since they are now encapsulated). 525 * 526 * IPv6 [ESP|AH] IPv6 [extension headers] payload 527 */ 528 bzero(&exthdrs, sizeof(exthdrs)); 529 exthdrs.ip6e_ip6 = m; 530 531 bzero(&state, sizeof(state)); 532 state.m = m; 533 state.ro = (struct route *)ro; 534 state.dst = (struct sockaddr *)dst; 535 536 error = ipsec6_output_tunnel(&state, sp, flags); 537 538 m = state.m; 539 ro = (struct route_in6 *)state.ro; 540 dst = (struct sockaddr_in6 *)state.dst; 541 if (error) { 542 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 543 m0 = m = NULL; 544 m = NULL; 545 switch (error) { 546 case EHOSTUNREACH: 547 case ENETUNREACH: 548 case EMSGSIZE: 549 case ENOBUFS: 550 case ENOMEM: 551 break; 552 default: 553 kprintf("ip6_output (ipsec): error code %d\n", error); 554 /* fall through */ 555 case ENOENT: 556 /* don't show these error codes to the user */ 557 error = 0; 558 break; 559 } 560 goto bad; 561 } 562 563 exthdrs.ip6e_ip6 = m; 564 } 565 #endif 566 567 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 568 /* Unicast */ 569 570 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 571 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 572 /* xxx 573 * interface selection comes here 574 * if an interface is specified from an upper layer, 575 * ifp must point it. 576 */ 577 if (ro->ro_rt == NULL) { 578 /* 579 * non-bsdi always clone routes, if parent is 580 * PRF_CLONING. 581 */ 582 rtalloc((struct route *)ro); 583 } 584 if (ro->ro_rt == NULL) { 585 ip6stat.ip6s_noroute++; 586 error = EHOSTUNREACH; 587 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 588 goto bad; 589 } 590 ia = ifatoia6(ro->ro_rt->rt_ifa); 591 ifp = ro->ro_rt->rt_ifp; 592 ro->ro_rt->rt_use++; 593 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 594 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 595 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 596 597 in6_ifstat_inc(ifp, ifs6_out_request); 598 599 /* 600 * Check if the outgoing interface conflicts with 601 * the interface specified by ifi6_ifindex (if specified). 602 * Note that loopback interface is always okay. 603 * (this may happen when we are sending a packet to one of 604 * our own addresses.) 605 */ 606 if (opt && opt->ip6po_pktinfo 607 && opt->ip6po_pktinfo->ipi6_ifindex) { 608 if (!(ifp->if_flags & IFF_LOOPBACK) 609 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 610 ip6stat.ip6s_noroute++; 611 in6_ifstat_inc(ifp, ifs6_out_discard); 612 error = EHOSTUNREACH; 613 goto bad; 614 } 615 } 616 617 if (opt && opt->ip6po_hlim != -1) 618 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 619 } else { 620 /* Multicast */ 621 struct in6_multi *in6m; 622 623 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 624 625 /* 626 * See if the caller provided any multicast options 627 */ 628 ifp = NULL; 629 if (im6o != NULL) { 630 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 631 if (im6o->im6o_multicast_ifp != NULL) 632 ifp = im6o->im6o_multicast_ifp; 633 } else 634 ip6->ip6_hlim = ip6_defmcasthlim; 635 636 /* 637 * See if the caller provided the outgoing interface 638 * as an ancillary data. 639 * Boundary check for ifindex is assumed to be already done. 640 */ 641 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 642 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 643 644 /* 645 * If the destination is a node-local scope multicast, 646 * the packet should be loop-backed only. 647 */ 648 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 649 /* 650 * If the outgoing interface is already specified, 651 * it should be a loopback interface. 652 */ 653 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 654 ip6stat.ip6s_badscope++; 655 error = ENETUNREACH; /* XXX: better error? */ 656 /* XXX correct ifp? */ 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 goto bad; 659 } else { 660 ifp = &loif[0]; 661 } 662 } 663 664 if (opt && opt->ip6po_hlim != -1) 665 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 666 667 /* 668 * If caller did not provide an interface lookup a 669 * default in the routing table. This is either a 670 * default for the speicfied group (i.e. a host 671 * route), or a multicast default (a route for the 672 * ``net'' ff00::/8). 673 */ 674 if (ifp == NULL) { 675 if (ro->ro_rt == NULL) { 676 ro->ro_rt = 677 rtpurelookup((struct sockaddr *)&ro->ro_dst); 678 } 679 if (ro->ro_rt == NULL) { 680 ip6stat.ip6s_noroute++; 681 error = EHOSTUNREACH; 682 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 683 goto bad; 684 } 685 ia = ifatoia6(ro->ro_rt->rt_ifa); 686 ifp = ro->ro_rt->rt_ifp; 687 ro->ro_rt->rt_use++; 688 } 689 690 if (!(flags & IPV6_FORWARDING)) 691 in6_ifstat_inc(ifp, ifs6_out_request); 692 in6_ifstat_inc(ifp, ifs6_out_mcast); 693 694 /* 695 * Confirm that the outgoing interface supports multicast. 696 */ 697 if (!(ifp->if_flags & IFF_MULTICAST)) { 698 ip6stat.ip6s_noroute++; 699 in6_ifstat_inc(ifp, ifs6_out_discard); 700 error = ENETUNREACH; 701 goto bad; 702 } 703 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 704 if (in6m != NULL && 705 (im6o == NULL || im6o->im6o_multicast_loop)) { 706 /* 707 * If we belong to the destination multicast group 708 * on the outgoing interface, and the caller did not 709 * forbid loopback, loop back a copy. 710 */ 711 ip6_mloopback(ifp, m, dst); 712 } else { 713 /* 714 * If we are acting as a multicast router, perform 715 * multicast forwarding as if the packet had just 716 * arrived on the interface to which we are about 717 * to send. The multicast forwarding function 718 * recursively calls this function, using the 719 * IPV6_FORWARDING flag to prevent infinite recursion. 720 * 721 * Multicasts that are looped back by ip6_mloopback(), 722 * above, will be forwarded by the ip6_input() routine, 723 * if necessary. 724 */ 725 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 726 if (ip6_mforward(ip6, ifp, m) != 0) { 727 m_freem(m); 728 goto done; 729 } 730 } 731 } 732 /* 733 * Multicasts with a hoplimit of zero may be looped back, 734 * above, but must not be transmitted on a network. 735 * Also, multicasts addressed to the loopback interface 736 * are not sent -- the above call to ip6_mloopback() will 737 * loop back a copy if this host actually belongs to the 738 * destination group on the loopback interface. 739 */ 740 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 741 m_freem(m); 742 goto done; 743 } 744 } 745 746 /* 747 * Fill the outgoing inteface to tell the upper layer 748 * to increment per-interface statistics. 749 */ 750 if (ifpp) 751 *ifpp = ifp; 752 753 /* Determine path MTU. */ 754 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 755 &alwaysfrag)) != 0) 756 goto bad; 757 758 /* 759 * The caller of this function may specify to use the minimum MTU 760 * in some cases. 761 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 762 * setting. The logic is a bit complicated; by default, unicast 763 * packets will follow path MTU while multicast packets will be sent at 764 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 765 * including unicast ones will be sent at the minimum MTU. Multicast 766 * packets will always be sent at the minimum MTU unless 767 * IP6PO_MINMTU_DISABLE is explicitly specified. 768 * See RFC 3542 for more details. 769 */ 770 if (mtu > IPV6_MMTU) { 771 if ((flags & IPV6_MINMTU)) 772 mtu = IPV6_MMTU; 773 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 774 mtu = IPV6_MMTU; 775 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 776 (opt == NULL || 777 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 778 mtu = IPV6_MMTU; 779 } 780 } 781 782 /* Fake scoped addresses */ 783 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 784 /* 785 * If source or destination address is a scoped address, and 786 * the packet is going to be sent to a loopback interface, 787 * we should keep the original interface. 788 */ 789 790 /* 791 * XXX: this is a very experimental and temporary solution. 792 * We eventually have sockaddr_in6 and use the sin6_scope_id 793 * field of the structure here. 794 * We rely on the consistency between two scope zone ids 795 * of source and destination, which should already be assured. 796 * Larger scopes than link will be supported in the future. 797 */ 798 origifp = NULL; 799 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 800 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 801 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 802 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 803 /* 804 * XXX: origifp can be NULL even in those two cases above. 805 * For example, if we remove the (only) link-local address 806 * from the loopback interface, and try to send a link-local 807 * address without link-id information. Then the source 808 * address is ::1, and the destination address is the 809 * link-local address with its s6_addr16[1] being zero. 810 * What is worse, if the packet goes to the loopback interface 811 * by a default rejected route, the null pointer would be 812 * passed to looutput, and the kernel would hang. 813 * The following last resort would prevent such disaster. 814 */ 815 if (origifp == NULL) 816 origifp = ifp; 817 } 818 else 819 origifp = ifp; 820 /* 821 * clear embedded scope identifiers if necessary. 822 * in6_clearscope will touch the addresses only when necessary. 823 */ 824 in6_clearscope(&ip6->ip6_src); 825 in6_clearscope(&ip6->ip6_dst); 826 827 /* 828 * Check with the firewall... 829 */ 830 if (ip6_fw_enable && ip6_fw_chk_ptr) { 831 u_short port = 0; 832 833 m->m_pkthdr.rcvif = NULL; /* XXX */ 834 /* If ipfw says divert, we have to just drop packet */ 835 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 836 m_freem(m); 837 goto done; 838 } 839 if (!m) { 840 error = EACCES; 841 goto done; 842 } 843 } 844 845 /* 846 * If the outgoing packet contains a hop-by-hop options header, 847 * it must be examined and processed even by the source node. 848 * (RFC 2460, section 4.) 849 */ 850 if (exthdrs.ip6e_hbh) { 851 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 852 u_int32_t dummy1; /* XXX unused */ 853 u_int32_t dummy2; /* XXX unused */ 854 855 #ifdef DIAGNOSTIC 856 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 857 panic("ip6e_hbh is not continuous"); 858 #endif 859 /* 860 * XXX: if we have to send an ICMPv6 error to the sender, 861 * we need the M_LOOP flag since icmp6_error() expects 862 * the IPv6 and the hop-by-hop options header are 863 * continuous unless the flag is set. 864 */ 865 m->m_flags |= M_LOOP; 866 m->m_pkthdr.rcvif = ifp; 867 if (ip6_process_hopopts(m, 868 (u_int8_t *)(hbh + 1), 869 ((hbh->ip6h_len + 1) << 3) - 870 sizeof(struct ip6_hbh), 871 &dummy1, &dummy2) < 0) { 872 /* m was already freed at this point */ 873 error = EINVAL;/* better error? */ 874 goto done; 875 } 876 m->m_flags &= ~M_LOOP; /* XXX */ 877 m->m_pkthdr.rcvif = NULL; 878 } 879 880 /* 881 * Run through list of hooks for output packets. 882 */ 883 if (pfil_has_hooks(&inet6_pfil_hook)) { 884 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 885 if (error != 0 || m == NULL) 886 goto done; 887 ip6 = mtod(m, struct ip6_hdr *); 888 } 889 890 /* 891 * Send the packet to the outgoing interface. 892 * If necessary, do IPv6 fragmentation before sending. 893 * 894 * the logic here is rather complex: 895 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 896 * 1-a: send as is if tlen <= path mtu 897 * 1-b: fragment if tlen > path mtu 898 * 899 * 2: if user asks us not to fragment (dontfrag == 1) 900 * 2-a: send as is if tlen <= interface mtu 901 * 2-b: error if tlen > interface mtu 902 * 903 * 3: if we always need to attach fragment header (alwaysfrag == 1) 904 * always fragment 905 * 906 * 4: if dontfrag == 1 && alwaysfrag == 1 907 * error, as we cannot handle this conflicting request 908 */ 909 tlen = m->m_pkthdr.len; 910 911 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 912 dontfrag = 1; 913 else 914 dontfrag = 0; 915 if (dontfrag && alwaysfrag) { /* case 4 */ 916 /* conflicting request - can't transmit */ 917 error = EMSGSIZE; 918 goto bad; 919 } 920 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 921 /* 922 * Even if the DONTFRAG option is specified, we cannot send the 923 * packet when the data length is larger than the MTU of the 924 * outgoing interface. 925 * Notify the error by sending IPV6_PATHMTU ancillary data as 926 * well as returning an error code (the latter is not described 927 * in the API spec.) 928 */ 929 u_int32_t mtu32; 930 struct ip6ctlparam ip6cp; 931 932 mtu32 = (u_int32_t)mtu; 933 bzero(&ip6cp, sizeof(ip6cp)); 934 ip6cp.ip6c_cmdarg = (void *)&mtu32; 935 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 936 (void *)&ip6cp); 937 938 error = EMSGSIZE; 939 goto bad; 940 } 941 942 /* 943 * transmit packet without fragmentation 944 */ 945 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 946 struct in6_ifaddr *ia6; 947 948 ip6 = mtod(m, struct ip6_hdr *); 949 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 950 if (ia6) { 951 /* Record statistics for this interface address. */ 952 ia6->ia_ifa.if_opackets++; 953 ia6->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 } 962 963 /* 964 * try to fragment the packet. case 1-b and 3 965 */ 966 if (mtu < IPV6_MMTU) { 967 /* 968 * note that path MTU is never less than IPV6_MMTU 969 * (see icmp6_input). 970 */ 971 error = EMSGSIZE; 972 in6_ifstat_inc(ifp, ifs6_out_fragfail); 973 goto bad; 974 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 975 error = EMSGSIZE; 976 in6_ifstat_inc(ifp, ifs6_out_fragfail); 977 goto bad; 978 } else { 979 struct mbuf **mnext, *m_frgpart; 980 struct ip6_frag *ip6f; 981 u_int32_t id = htonl(ip6_id++); 982 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 983 u_char nextproto; 984 985 /* 986 * Too large for the destination or interface; 987 * fragment if possible. 988 * Must be able to put at least 8 bytes per fragment. 989 */ 990 hlen = unfragpartlen; 991 if (mtu > IPV6_MAXPACKET) 992 mtu = IPV6_MAXPACKET; 993 994 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 995 if (len < 8) { 996 error = EMSGSIZE; 997 in6_ifstat_inc(ifp, ifs6_out_fragfail); 998 goto bad; 999 } 1000 1001 /* 1002 * Verify that we have any chance at all of being able to queue 1003 * the packet or packet fragments 1004 */ 1005 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1006 < tlen /* - hlen */)) { 1007 error = ENOBUFS; 1008 ip6stat.ip6s_odropped++; 1009 goto bad; 1010 } 1011 1012 mnext = &m->m_nextpkt; 1013 1014 /* 1015 * Change the next header field of the last header in the 1016 * unfragmentable part. 1017 */ 1018 if (exthdrs.ip6e_rthdr) { 1019 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1020 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1021 } else if (exthdrs.ip6e_dest1) { 1022 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1023 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1024 } else if (exthdrs.ip6e_hbh) { 1025 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1026 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1027 } else { 1028 nextproto = ip6->ip6_nxt; 1029 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1030 } 1031 1032 /* 1033 * Loop through length of segment after first fragment, 1034 * make new header and copy data of each part and link onto 1035 * chain. 1036 */ 1037 m0 = m; 1038 for (off = hlen; off < tlen; off += len) { 1039 MGETHDR(m, MB_DONTWAIT, MT_HEADER); 1040 if (!m) { 1041 error = ENOBUFS; 1042 ip6stat.ip6s_odropped++; 1043 goto sendorfree; 1044 } 1045 m->m_pkthdr.rcvif = NULL; 1046 m->m_flags = m0->m_flags & M_COPYFLAGS; 1047 *mnext = m; 1048 mnext = &m->m_nextpkt; 1049 m->m_data += max_linkhdr; 1050 mhip6 = mtod(m, struct ip6_hdr *); 1051 *mhip6 = *ip6; 1052 m->m_len = sizeof(*mhip6); 1053 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1054 if (error) { 1055 ip6stat.ip6s_odropped++; 1056 goto sendorfree; 1057 } 1058 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1059 if (off + len >= tlen) 1060 len = tlen - off; 1061 else 1062 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1063 mhip6->ip6_plen = htons((u_short)(len + hlen + 1064 sizeof(*ip6f) - 1065 sizeof(struct ip6_hdr))); 1066 if ((m_frgpart = m_copy(m0, off, len)) == NULL) { 1067 error = ENOBUFS; 1068 ip6stat.ip6s_odropped++; 1069 goto sendorfree; 1070 } 1071 m_cat(m, m_frgpart); 1072 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1073 m->m_pkthdr.rcvif = NULL; 1074 ip6f->ip6f_reserved = 0; 1075 ip6f->ip6f_ident = id; 1076 ip6f->ip6f_nxt = nextproto; 1077 ip6stat.ip6s_ofragments++; 1078 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1079 } 1080 1081 in6_ifstat_inc(ifp, ifs6_out_fragok); 1082 } 1083 1084 /* 1085 * Remove leading garbages. 1086 */ 1087 sendorfree: 1088 m = m0->m_nextpkt; 1089 m0->m_nextpkt = NULL; 1090 m_freem(m0); 1091 for (m0 = m; m; m = m0) { 1092 m0 = m->m_nextpkt; 1093 m->m_nextpkt = NULL; 1094 if (error == 0) { 1095 /* Record statistics for this interface address. */ 1096 if (ia) { 1097 ia->ia_ifa.if_opackets++; 1098 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1099 } 1100 #ifdef IPSEC 1101 /* clean ipsec history once it goes out of the node */ 1102 ipsec_delaux(m); 1103 #endif 1104 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1105 } else 1106 m_freem(m); 1107 } 1108 1109 if (error == 0) 1110 ip6stat.ip6s_fragmented++; 1111 1112 done: 1113 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1114 RTFREE(ro->ro_rt); 1115 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1116 RTFREE(ro_pmtu->ro_rt); 1117 } 1118 1119 #ifdef IPSEC 1120 if (sp != NULL) 1121 key_freesp(sp); 1122 #endif 1123 #ifdef FAST_IPSEC 1124 if (sp != NULL) 1125 KEY_FREESP(&sp); 1126 #endif 1127 1128 return (error); 1129 1130 freehdrs: 1131 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1132 m_freem(exthdrs.ip6e_dest1); 1133 m_freem(exthdrs.ip6e_rthdr); 1134 m_freem(exthdrs.ip6e_dest2); 1135 /* fall through */ 1136 bad: 1137 m_freem(m); 1138 goto done; 1139 } 1140 1141 static int 1142 copyexthdr(void *h, struct mbuf **mp) 1143 { 1144 struct ip6_ext *hdr = h; 1145 int hlen; 1146 struct mbuf *m; 1147 1148 if (hdr == NULL) 1149 return 0; 1150 1151 hlen = (hdr->ip6e_len + 1) * 8; 1152 if (hlen > MCLBYTES) 1153 return ENOBUFS; /* XXX */ 1154 1155 m = m_getb(hlen, MB_DONTWAIT, MT_DATA, 0); 1156 if (!m) 1157 return ENOBUFS; 1158 m->m_len = hlen; 1159 1160 bcopy(hdr, mtod(m, caddr_t), hlen); 1161 1162 *mp = m; 1163 return 0; 1164 } 1165 1166 /* 1167 * Insert jumbo payload option. 1168 */ 1169 static int 1170 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1171 { 1172 struct mbuf *mopt; 1173 u_char *optbuf; 1174 u_int32_t v; 1175 1176 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1177 1178 /* 1179 * If there is no hop-by-hop options header, allocate new one. 1180 * If there is one but it doesn't have enough space to store the 1181 * jumbo payload option, allocate a cluster to store the whole options. 1182 * Otherwise, use it to store the options. 1183 */ 1184 if (exthdrs->ip6e_hbh == NULL) { 1185 MGET(mopt, MB_DONTWAIT, MT_DATA); 1186 if (mopt == NULL) 1187 return (ENOBUFS); 1188 mopt->m_len = JUMBOOPTLEN; 1189 optbuf = mtod(mopt, u_char *); 1190 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1191 exthdrs->ip6e_hbh = mopt; 1192 } else { 1193 struct ip6_hbh *hbh; 1194 1195 mopt = exthdrs->ip6e_hbh; 1196 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1197 /* 1198 * XXX assumption: 1199 * - exthdrs->ip6e_hbh is not referenced from places 1200 * other than exthdrs. 1201 * - exthdrs->ip6e_hbh is not an mbuf chain. 1202 */ 1203 int oldoptlen = mopt->m_len; 1204 struct mbuf *n; 1205 1206 /* 1207 * XXX: give up if the whole (new) hbh header does 1208 * not fit even in an mbuf cluster. 1209 */ 1210 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1211 return (ENOBUFS); 1212 1213 /* 1214 * As a consequence, we must always prepare a cluster 1215 * at this point. 1216 */ 1217 n = m_getcl(MB_DONTWAIT, MT_DATA, 0); 1218 if (!n) 1219 return (ENOBUFS); 1220 n->m_len = oldoptlen + JUMBOOPTLEN; 1221 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 1222 optbuf = mtod(n, caddr_t) + oldoptlen; 1223 m_freem(mopt); 1224 mopt = exthdrs->ip6e_hbh = n; 1225 } else { 1226 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1227 mopt->m_len += JUMBOOPTLEN; 1228 } 1229 optbuf[0] = IP6OPT_PADN; 1230 optbuf[1] = 1; 1231 1232 /* 1233 * Adjust the header length according to the pad and 1234 * the jumbo payload option. 1235 */ 1236 hbh = mtod(mopt, struct ip6_hbh *); 1237 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1238 } 1239 1240 /* fill in the option. */ 1241 optbuf[2] = IP6OPT_JUMBO; 1242 optbuf[3] = 4; 1243 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1244 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1245 1246 /* finally, adjust the packet header length */ 1247 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1248 1249 return (0); 1250 #undef JUMBOOPTLEN 1251 } 1252 1253 /* 1254 * Insert fragment header and copy unfragmentable header portions. 1255 */ 1256 static int 1257 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1258 struct ip6_frag **frghdrp) 1259 { 1260 struct mbuf *n, *mlast; 1261 1262 if (hlen > sizeof(struct ip6_hdr)) { 1263 n = m_copym(m0, sizeof(struct ip6_hdr), 1264 hlen - sizeof(struct ip6_hdr), MB_DONTWAIT); 1265 if (n == NULL) 1266 return (ENOBUFS); 1267 m->m_next = n; 1268 } else 1269 n = m; 1270 1271 /* Search for the last mbuf of unfragmentable part. */ 1272 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1273 ; 1274 1275 if (!(mlast->m_flags & M_EXT) && 1276 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1277 /* use the trailing space of the last mbuf for the fragment hdr */ 1278 *frghdrp = 1279 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1280 mlast->m_len += sizeof(struct ip6_frag); 1281 m->m_pkthdr.len += sizeof(struct ip6_frag); 1282 } else { 1283 /* allocate a new mbuf for the fragment header */ 1284 struct mbuf *mfrg; 1285 1286 MGET(mfrg, MB_DONTWAIT, MT_DATA); 1287 if (mfrg == NULL) 1288 return (ENOBUFS); 1289 mfrg->m_len = sizeof(struct ip6_frag); 1290 *frghdrp = mtod(mfrg, struct ip6_frag *); 1291 mlast->m_next = mfrg; 1292 } 1293 1294 return (0); 1295 } 1296 1297 static int 1298 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1299 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1300 int *alwaysfragp) 1301 { 1302 u_int32_t mtu = 0; 1303 int alwaysfrag = 0; 1304 int error = 0; 1305 1306 if (ro_pmtu != ro) { 1307 /* The first hop and the final destination may differ. */ 1308 struct sockaddr_in6 *sa6_dst = 1309 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1310 if (ro_pmtu->ro_rt && 1311 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1312 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1313 RTFREE(ro_pmtu->ro_rt); 1314 ro_pmtu->ro_rt = NULL; 1315 } 1316 if (ro_pmtu->ro_rt == NULL) { 1317 bzero(sa6_dst, sizeof(*sa6_dst)); 1318 sa6_dst->sin6_family = AF_INET6; 1319 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1320 sa6_dst->sin6_addr = *dst; 1321 1322 rtalloc((struct route *)ro_pmtu); 1323 } 1324 } 1325 if (ro_pmtu->ro_rt) { 1326 u_int32_t ifmtu; 1327 struct in_conninfo inc; 1328 1329 bzero(&inc, sizeof(inc)); 1330 inc.inc_flags = 1; /* IPv6 */ 1331 inc.inc6_faddr = *dst; 1332 1333 if (ifp == NULL) 1334 ifp = ro_pmtu->ro_rt->rt_ifp; 1335 ifmtu = IN6_LINKMTU(ifp); 1336 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1337 if (mtu == 0) 1338 mtu = ifmtu; 1339 else if (mtu < IPV6_MMTU) { 1340 /* 1341 * RFC2460 section 5, last paragraph: 1342 * if we record ICMPv6 too big message with 1343 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1344 * or smaller, with framgent header attached. 1345 * (fragment header is needed regardless from the 1346 * packet size, for translators to identify packets) 1347 */ 1348 alwaysfrag = 1; 1349 mtu = IPV6_MMTU; 1350 } else if (mtu > ifmtu) { 1351 /* 1352 * The MTU on the route is larger than the MTU on 1353 * the interface! This shouldn't happen, unless the 1354 * MTU of the interface has been changed after the 1355 * interface was brought up. Change the MTU in the 1356 * route to match the interface MTU (as long as the 1357 * field isn't locked). 1358 */ 1359 mtu = ifmtu; 1360 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1361 } 1362 } else if (ifp) { 1363 mtu = IN6_LINKMTU(ifp); 1364 } else 1365 error = EHOSTUNREACH; /* XXX */ 1366 1367 *mtup = mtu; 1368 if (alwaysfragp) 1369 *alwaysfragp = alwaysfrag; 1370 return (error); 1371 } 1372 1373 /* 1374 * IP6 socket option processing. 1375 */ 1376 void 1377 ip6_ctloutput_dispatch(netmsg_t msg) 1378 { 1379 int error; 1380 1381 error = ip6_ctloutput(msg->ctloutput.base.nm_so, 1382 msg->ctloutput.nm_sopt); 1383 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 1384 } 1385 1386 int 1387 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1388 { 1389 int optdatalen,uproto; 1390 int privileged; 1391 struct inpcb *in6p = so->so_pcb; 1392 void *optdata; 1393 int error, optval; 1394 int level, op, optname; 1395 int optlen; 1396 struct thread *td; 1397 1398 if (sopt) { 1399 level = sopt->sopt_level; 1400 op = sopt->sopt_dir; 1401 optname = sopt->sopt_name; 1402 optlen = sopt->sopt_valsize; 1403 td = sopt->sopt_td; 1404 } else { 1405 panic("ip6_ctloutput: arg soopt is NULL"); 1406 /* NOT REACHED */ 1407 td = NULL; 1408 } 1409 error = optval = 0; 1410 1411 uproto = (int)so->so_proto->pr_protocol; 1412 privileged = (td == NULL || priv_check(td, PRIV_ROOT)) ? 0 : 1; 1413 1414 if (level == IPPROTO_IPV6) { 1415 switch (op) { 1416 1417 case SOPT_SET: 1418 switch (optname) { 1419 case IPV6_2292PKTOPTIONS: 1420 #ifdef IPV6_PKTOPTIONS 1421 case IPV6_PKTOPTIONS: 1422 #endif 1423 { 1424 struct mbuf *m; 1425 1426 error = soopt_getm(sopt, &m); /* XXX */ 1427 if (error != 0) 1428 break; 1429 soopt_to_mbuf(sopt, m); /* XXX */ 1430 error = ip6_pcbopts(&in6p->in6p_outputopts, 1431 m, so, sopt); 1432 m_freem(m); /* XXX */ 1433 break; 1434 } 1435 1436 /* 1437 * Use of some Hop-by-Hop options or some 1438 * Destination options, might require special 1439 * privilege. That is, normal applications 1440 * (without special privilege) might be forbidden 1441 * from setting certain options in outgoing packets, 1442 * and might never see certain options in received 1443 * packets. [RFC 2292 Section 6] 1444 * KAME specific note: 1445 * KAME prevents non-privileged users from sending or 1446 * receiving ANY hbh/dst options in order to avoid 1447 * overhead of parsing options in the kernel. 1448 */ 1449 case IPV6_RECVHOPOPTS: 1450 case IPV6_RECVDSTOPTS: 1451 case IPV6_RECVRTHDRDSTOPTS: 1452 if (!privileged) 1453 return (EPERM); 1454 case IPV6_RECVPKTINFO: 1455 case IPV6_RECVHOPLIMIT: 1456 case IPV6_RECVRTHDR: 1457 case IPV6_RECVPATHMTU: 1458 case IPV6_RECVTCLASS: 1459 case IPV6_AUTOFLOWLABEL: 1460 case IPV6_HOPLIMIT: 1461 /* FALLTHROUGH */ 1462 case IPV6_UNICAST_HOPS: 1463 case IPV6_FAITH: 1464 1465 case IPV6_V6ONLY: 1466 if (optlen != sizeof(int)) { 1467 error = EINVAL; 1468 break; 1469 } 1470 error = soopt_to_kbuf(sopt, &optval, 1471 sizeof optval, sizeof optval); 1472 if (error) 1473 break; 1474 switch (optname) { 1475 1476 case IPV6_UNICAST_HOPS: 1477 if (optval < -1 || optval >= 256) 1478 error = EINVAL; 1479 else { 1480 /* -1 = kernel default */ 1481 in6p->in6p_hops = optval; 1482 1483 if ((in6p->in6p_vflag & 1484 INP_IPV4) != 0) 1485 in6p->inp_ip_ttl = optval; 1486 } 1487 break; 1488 #define OPTSET(bit) \ 1489 do { \ 1490 if (optval) \ 1491 in6p->in6p_flags |= (bit); \ 1492 else \ 1493 in6p->in6p_flags &= ~(bit); \ 1494 } while (0) 1495 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1496 /* 1497 * Although changed to RFC3542, It's better to also support RFC2292 API 1498 */ 1499 #define OPTSET2292(bit) \ 1500 do { \ 1501 in6p->in6p_flags |= IN6P_RFC2292; \ 1502 if (optval) \ 1503 in6p->in6p_flags |= (bit); \ 1504 else \ 1505 in6p->in6p_flags &= ~(bit); \ 1506 } while (/*CONSTCOND*/ 0) 1507 1508 case IPV6_RECVPKTINFO: 1509 /* cannot mix with RFC2292 */ 1510 if (OPTBIT(IN6P_RFC2292)) { 1511 error = EINVAL; 1512 break; 1513 } 1514 OPTSET(IN6P_PKTINFO); 1515 break; 1516 1517 case IPV6_HOPLIMIT: 1518 { 1519 struct ip6_pktopts **optp; 1520 1521 /* cannot mix with RFC2292 */ 1522 if (OPTBIT(IN6P_RFC2292)) { 1523 error = EINVAL; 1524 break; 1525 } 1526 optp = &in6p->in6p_outputopts; 1527 error = ip6_pcbopt(IPV6_HOPLIMIT, 1528 (u_char *)&optval, sizeof(optval), 1529 optp, uproto); 1530 break; 1531 } 1532 1533 case IPV6_RECVHOPLIMIT: 1534 /* cannot mix with RFC2292 */ 1535 if (OPTBIT(IN6P_RFC2292)) { 1536 error = EINVAL; 1537 break; 1538 } 1539 OPTSET(IN6P_HOPLIMIT); 1540 break; 1541 1542 case IPV6_RECVHOPOPTS: 1543 /* cannot mix with RFC2292 */ 1544 if (OPTBIT(IN6P_RFC2292)) { 1545 error = EINVAL; 1546 break; 1547 } 1548 OPTSET(IN6P_HOPOPTS); 1549 break; 1550 1551 case IPV6_RECVDSTOPTS: 1552 /* cannot mix with RFC2292 */ 1553 if (OPTBIT(IN6P_RFC2292)) { 1554 error = EINVAL; 1555 break; 1556 } 1557 OPTSET(IN6P_DSTOPTS); 1558 break; 1559 1560 case IPV6_RECVRTHDRDSTOPTS: 1561 /* cannot mix with RFC2292 */ 1562 if (OPTBIT(IN6P_RFC2292)) { 1563 error = EINVAL; 1564 break; 1565 } 1566 OPTSET(IN6P_RTHDRDSTOPTS); 1567 break; 1568 1569 case IPV6_RECVRTHDR: 1570 /* cannot mix with RFC2292 */ 1571 if (OPTBIT(IN6P_RFC2292)) { 1572 error = EINVAL; 1573 break; 1574 } 1575 OPTSET(IN6P_RTHDR); 1576 break; 1577 1578 case IPV6_RECVPATHMTU: 1579 /* 1580 * We ignore this option for TCP 1581 * sockets. 1582 * (RFC3542 leaves this case 1583 * unspecified.) 1584 */ 1585 if (uproto != IPPROTO_TCP) 1586 OPTSET(IN6P_MTU); 1587 break; 1588 1589 case IPV6_RECVTCLASS: 1590 /* cannot mix with RFC2292 XXX */ 1591 if (OPTBIT(IN6P_RFC2292)) { 1592 error = EINVAL; 1593 break; 1594 } 1595 OPTSET(IN6P_TCLASS); 1596 break; 1597 1598 case IPV6_AUTOFLOWLABEL: 1599 OPTSET(IN6P_AUTOFLOWLABEL); 1600 break; 1601 1602 case IPV6_FAITH: 1603 OPTSET(IN6P_FAITH); 1604 break; 1605 1606 case IPV6_V6ONLY: 1607 /* 1608 * make setsockopt(IPV6_V6ONLY) 1609 * available only prior to bind(2). 1610 */ 1611 if (in6p->in6p_lport || 1612 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1613 { 1614 error = EINVAL; 1615 break; 1616 } 1617 OPTSET(IN6P_IPV6_V6ONLY); 1618 if (optval) 1619 in6p->in6p_vflag &= ~INP_IPV4; 1620 else 1621 in6p->in6p_vflag |= INP_IPV4; 1622 break; 1623 } 1624 break; 1625 1626 case IPV6_TCLASS: 1627 case IPV6_DONTFRAG: 1628 case IPV6_USE_MIN_MTU: 1629 case IPV6_PREFER_TEMPADDR: 1630 if (optlen != sizeof(optval)) { 1631 error = EINVAL; 1632 break; 1633 } 1634 error = soopt_to_kbuf(sopt, &optval, 1635 sizeof optval, sizeof optval); 1636 if (error) 1637 break; 1638 { 1639 struct ip6_pktopts **optp; 1640 optp = &in6p->in6p_outputopts; 1641 error = ip6_pcbopt(optname, 1642 (u_char *)&optval, sizeof(optval), 1643 optp, uproto); 1644 break; 1645 } 1646 1647 case IPV6_2292PKTINFO: 1648 case IPV6_2292HOPLIMIT: 1649 case IPV6_2292HOPOPTS: 1650 case IPV6_2292DSTOPTS: 1651 case IPV6_2292RTHDR: 1652 /* RFC 2292 */ 1653 if (optlen != sizeof(int)) { 1654 error = EINVAL; 1655 break; 1656 } 1657 error = soopt_to_kbuf(sopt, &optval, 1658 sizeof optval, sizeof optval); 1659 if (error) 1660 break; 1661 switch (optname) { 1662 case IPV6_2292PKTINFO: 1663 OPTSET2292(IN6P_PKTINFO); 1664 break; 1665 case IPV6_2292HOPLIMIT: 1666 OPTSET2292(IN6P_HOPLIMIT); 1667 break; 1668 case IPV6_2292HOPOPTS: 1669 /* 1670 * Check super-user privilege. 1671 * See comments for IPV6_RECVHOPOPTS. 1672 */ 1673 if (!privileged) 1674 return (EPERM); 1675 OPTSET2292(IN6P_HOPOPTS); 1676 break; 1677 case IPV6_2292DSTOPTS: 1678 if (!privileged) 1679 return (EPERM); 1680 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1681 break; 1682 case IPV6_2292RTHDR: 1683 OPTSET2292(IN6P_RTHDR); 1684 break; 1685 } 1686 break; 1687 1688 case IPV6_PKTINFO: 1689 case IPV6_HOPOPTS: 1690 case IPV6_RTHDR: 1691 case IPV6_DSTOPTS: 1692 case IPV6_RTHDRDSTOPTS: 1693 case IPV6_NEXTHOP: 1694 { 1695 /* 1696 * New advanced API (RFC3542) 1697 */ 1698 u_char *optbuf; 1699 u_char optbuf_storage[MCLBYTES]; 1700 int optlen; 1701 struct ip6_pktopts **optp; 1702 1703 /* cannot mix with RFC2292 */ 1704 if (OPTBIT(IN6P_RFC2292)) { 1705 error = EINVAL; 1706 break; 1707 } 1708 1709 /* 1710 * We only ensure valsize is not too large 1711 * here. Further validation will be done 1712 * later. 1713 */ 1714 error = soopt_to_kbuf(sopt, optbuf_storage, 1715 sizeof(optbuf_storage), 0); 1716 if (error) 1717 break; 1718 optlen = sopt->sopt_valsize; 1719 optbuf = optbuf_storage; 1720 optp = &in6p->in6p_outputopts; 1721 error = ip6_pcbopt(optname, optbuf, optlen, 1722 optp, uproto); 1723 break; 1724 } 1725 #undef OPTSET 1726 1727 case IPV6_MULTICAST_IF: 1728 case IPV6_MULTICAST_HOPS: 1729 case IPV6_MULTICAST_LOOP: 1730 case IPV6_JOIN_GROUP: 1731 case IPV6_LEAVE_GROUP: 1732 { 1733 struct mbuf *m; 1734 if (sopt->sopt_valsize > MLEN) { 1735 error = EMSGSIZE; 1736 break; 1737 } 1738 /* XXX */ 1739 MGET(m, sopt->sopt_td ? MB_WAIT : MB_DONTWAIT, MT_HEADER); 1740 if (m == NULL) { 1741 error = ENOBUFS; 1742 break; 1743 } 1744 m->m_len = sopt->sopt_valsize; 1745 error = soopt_to_kbuf(sopt, mtod(m, char *), 1746 m->m_len, m->m_len); 1747 error = ip6_setmoptions(sopt->sopt_name, 1748 &in6p->in6p_moptions, 1749 m); 1750 m_free(m); 1751 } 1752 break; 1753 1754 case IPV6_PORTRANGE: 1755 error = soopt_to_kbuf(sopt, &optval, 1756 sizeof optval, sizeof optval); 1757 if (error) 1758 break; 1759 1760 switch (optval) { 1761 case IPV6_PORTRANGE_DEFAULT: 1762 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1763 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1764 break; 1765 1766 case IPV6_PORTRANGE_HIGH: 1767 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1768 in6p->in6p_flags |= IN6P_HIGHPORT; 1769 break; 1770 1771 case IPV6_PORTRANGE_LOW: 1772 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1773 in6p->in6p_flags |= IN6P_LOWPORT; 1774 break; 1775 1776 default: 1777 error = EINVAL; 1778 break; 1779 } 1780 break; 1781 1782 #if defined(IPSEC) || defined(FAST_IPSEC) 1783 case IPV6_IPSEC_POLICY: 1784 { 1785 caddr_t req = NULL; 1786 size_t len = 0; 1787 struct mbuf *m; 1788 1789 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1790 break; 1791 soopt_to_mbuf(sopt, m); /* XXX */ 1792 if (m) { 1793 req = mtod(m, caddr_t); 1794 len = m->m_len; 1795 } 1796 error = ipsec6_set_policy(in6p, optname, req, 1797 len, privileged); 1798 m_freem(m); 1799 } 1800 break; 1801 #endif /* KAME IPSEC */ 1802 1803 case IPV6_FW_ADD: 1804 case IPV6_FW_DEL: 1805 case IPV6_FW_FLUSH: 1806 case IPV6_FW_ZERO: 1807 { 1808 struct mbuf *m; 1809 struct mbuf **mp = &m; 1810 1811 if (ip6_fw_ctl_ptr == NULL) 1812 return EINVAL; 1813 /* XXX */ 1814 if ((error = soopt_getm(sopt, &m)) != 0) 1815 break; 1816 /* XXX */ 1817 soopt_to_mbuf(sopt, m); 1818 error = (*ip6_fw_ctl_ptr)(optname, mp); 1819 m = *mp; 1820 } 1821 break; 1822 1823 default: 1824 error = ENOPROTOOPT; 1825 break; 1826 } 1827 break; 1828 1829 case SOPT_GET: 1830 switch (optname) { 1831 case IPV6_2292PKTOPTIONS: 1832 #ifdef IPV6_PKTOPTIONS 1833 case IPV6_PKTOPTIONS: 1834 #endif 1835 /* 1836 * RFC3542 (effectively) deprecated the 1837 * semantics of the 2292-style pktoptions. 1838 * Since it was not reliable in nature (i.e., 1839 * applications had to expect the lack of some 1840 * information after all), it would make sense 1841 * to simplify this part by always returning 1842 * empty data. 1843 */ 1844 if (in6p->in6p_options) { 1845 struct mbuf *m; 1846 m = m_copym(in6p->in6p_options, 1847 0, M_COPYALL, MB_WAIT); 1848 error = soopt_from_mbuf(sopt, m); 1849 if (error == 0) 1850 m_freem(m); 1851 } else 1852 sopt->sopt_valsize = 0; 1853 break; 1854 1855 case IPV6_RECVHOPOPTS: 1856 case IPV6_RECVDSTOPTS: 1857 case IPV6_RECVRTHDRDSTOPTS: 1858 case IPV6_UNICAST_HOPS: 1859 case IPV6_RECVPKTINFO: 1860 case IPV6_RECVHOPLIMIT: 1861 case IPV6_RECVRTHDR: 1862 case IPV6_RECVPATHMTU: 1863 case IPV6_RECVTCLASS: 1864 case IPV6_AUTOFLOWLABEL: 1865 case IPV6_FAITH: 1866 case IPV6_V6ONLY: 1867 case IPV6_PORTRANGE: 1868 switch (optname) { 1869 1870 case IPV6_RECVHOPOPTS: 1871 optval = OPTBIT(IN6P_HOPOPTS); 1872 break; 1873 1874 case IPV6_RECVDSTOPTS: 1875 optval = OPTBIT(IN6P_DSTOPTS); 1876 break; 1877 1878 case IPV6_RECVRTHDRDSTOPTS: 1879 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1880 break; 1881 1882 case IPV6_RECVPKTINFO: 1883 optval = OPTBIT(IN6P_PKTINFO); 1884 break; 1885 1886 case IPV6_RECVHOPLIMIT: 1887 optval = OPTBIT(IN6P_HOPLIMIT); 1888 break; 1889 1890 case IPV6_RECVRTHDR: 1891 optval = OPTBIT(IN6P_RTHDR); 1892 break; 1893 1894 case IPV6_RECVPATHMTU: 1895 optval = OPTBIT(IN6P_MTU); 1896 break; 1897 1898 case IPV6_RECVTCLASS: 1899 optval = OPTBIT(IN6P_TCLASS); 1900 break; 1901 1902 case IPV6_AUTOFLOWLABEL: 1903 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1904 break; 1905 1906 1907 case IPV6_UNICAST_HOPS: 1908 optval = in6p->in6p_hops; 1909 break; 1910 1911 case IPV6_FAITH: 1912 optval = OPTBIT(IN6P_FAITH); 1913 break; 1914 1915 case IPV6_V6ONLY: 1916 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1917 break; 1918 1919 case IPV6_PORTRANGE: 1920 { 1921 int flags; 1922 flags = in6p->in6p_flags; 1923 if (flags & IN6P_HIGHPORT) 1924 optval = IPV6_PORTRANGE_HIGH; 1925 else if (flags & IN6P_LOWPORT) 1926 optval = IPV6_PORTRANGE_LOW; 1927 else 1928 optval = 0; 1929 break; 1930 } 1931 } 1932 soopt_from_kbuf(sopt, &optval, 1933 sizeof optval); 1934 break; 1935 1936 case IPV6_PATHMTU: 1937 { 1938 u_long pmtu = 0; 1939 struct ip6_mtuinfo mtuinfo; 1940 struct route_in6 sro; 1941 1942 bzero(&sro, sizeof(sro)); 1943 1944 if (!(so->so_state & SS_ISCONNECTED)) 1945 return (ENOTCONN); 1946 /* 1947 * XXX: we dot not consider the case of source 1948 * routing, or optional information to specify 1949 * the outgoing interface. 1950 */ 1951 error = ip6_getpmtu(&sro, NULL, NULL, 1952 &in6p->in6p_faddr, &pmtu, NULL); 1953 if (sro.ro_rt) 1954 RTFREE(sro.ro_rt); 1955 if (error) 1956 break; 1957 if (pmtu > IPV6_MAXPACKET) 1958 pmtu = IPV6_MAXPACKET; 1959 1960 bzero(&mtuinfo, sizeof(mtuinfo)); 1961 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1962 optdata = (void *)&mtuinfo; 1963 optdatalen = sizeof(mtuinfo); 1964 soopt_from_kbuf(sopt, optdata, 1965 optdatalen); 1966 break; 1967 } 1968 1969 case IPV6_2292PKTINFO: 1970 case IPV6_2292HOPLIMIT: 1971 case IPV6_2292HOPOPTS: 1972 case IPV6_2292RTHDR: 1973 case IPV6_2292DSTOPTS: 1974 if (optname == IPV6_2292HOPOPTS || 1975 optname == IPV6_2292DSTOPTS || 1976 !privileged) 1977 return (EPERM); 1978 switch (optname) { 1979 case IPV6_2292PKTINFO: 1980 optval = OPTBIT(IN6P_PKTINFO); 1981 break; 1982 case IPV6_2292HOPLIMIT: 1983 optval = OPTBIT(IN6P_HOPLIMIT); 1984 break; 1985 case IPV6_2292HOPOPTS: 1986 if (!privileged) 1987 return (EPERM); 1988 optval = OPTBIT(IN6P_HOPOPTS); 1989 break; 1990 case IPV6_2292RTHDR: 1991 optval = OPTBIT(IN6P_RTHDR); 1992 break; 1993 case IPV6_2292DSTOPTS: 1994 if (!privileged) 1995 return (EPERM); 1996 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1997 break; 1998 } 1999 soopt_from_kbuf(sopt, &optval, 2000 sizeof optval); 2001 break; 2002 2003 case IPV6_PKTINFO: 2004 case IPV6_HOPOPTS: 2005 case IPV6_RTHDR: 2006 case IPV6_DSTOPTS: 2007 case IPV6_RTHDRDSTOPTS: 2008 case IPV6_NEXTHOP: 2009 case IPV6_TCLASS: 2010 case IPV6_DONTFRAG: 2011 case IPV6_USE_MIN_MTU: 2012 case IPV6_PREFER_TEMPADDR: 2013 error = ip6_getpcbopt(in6p->in6p_outputopts, 2014 optname, sopt); 2015 break; 2016 2017 case IPV6_MULTICAST_IF: 2018 case IPV6_MULTICAST_HOPS: 2019 case IPV6_MULTICAST_LOOP: 2020 case IPV6_JOIN_GROUP: 2021 case IPV6_LEAVE_GROUP: 2022 { 2023 struct mbuf *m; 2024 error = ip6_getmoptions(sopt->sopt_name, 2025 in6p->in6p_moptions, &m); 2026 if (error == 0) 2027 soopt_from_kbuf(sopt, 2028 mtod(m, char *), m->m_len); 2029 m_freem(m); 2030 } 2031 break; 2032 2033 #if defined(IPSEC) || defined(FAST_IPSEC) 2034 case IPV6_IPSEC_POLICY: 2035 { 2036 caddr_t req = NULL; 2037 size_t len = 0; 2038 struct mbuf *m = NULL; 2039 struct mbuf **mp = &m; 2040 2041 error = soopt_getm(sopt, &m); /* XXX */ 2042 if (error != 0) 2043 break; 2044 soopt_to_mbuf(sopt, m); /* XXX */ 2045 if (m) { 2046 req = mtod(m, caddr_t); 2047 len = m->m_len; 2048 } 2049 error = ipsec6_get_policy(in6p, req, len, mp); 2050 if (error == 0) 2051 error = soopt_from_mbuf(sopt, m); /*XXX*/ 2052 if (error == 0 && m != NULL) 2053 m_freem(m); 2054 break; 2055 } 2056 #endif /* KAME IPSEC */ 2057 2058 case IPV6_FW_GET: 2059 { 2060 struct mbuf *m; 2061 struct mbuf **mp = &m; 2062 2063 if (ip6_fw_ctl_ptr == NULL) 2064 { 2065 return EINVAL; 2066 } 2067 error = (*ip6_fw_ctl_ptr)(optname, mp); 2068 if (error == 0) 2069 error = soopt_from_mbuf(sopt, m); /* XXX */ 2070 if (error == 0 && m != NULL) 2071 m_freem(m); 2072 } 2073 break; 2074 2075 default: 2076 error = ENOPROTOOPT; 2077 break; 2078 } 2079 break; 2080 } 2081 } else { 2082 error = EINVAL; 2083 } 2084 return (error); 2085 } 2086 2087 int 2088 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2089 { 2090 int error = 0, optval, optlen; 2091 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2092 struct in6pcb *in6p = sotoin6pcb(so); 2093 int level, op, optname; 2094 2095 if (sopt) { 2096 level = sopt->sopt_level; 2097 op = sopt->sopt_dir; 2098 optname = sopt->sopt_name; 2099 optlen = sopt->sopt_valsize; 2100 } else 2101 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2102 2103 if (level != IPPROTO_IPV6) { 2104 return (EINVAL); 2105 } 2106 2107 switch (optname) { 2108 case IPV6_CHECKSUM: 2109 /* 2110 * For ICMPv6 sockets, no modification allowed for checksum 2111 * offset, permit "no change" values to help existing apps. 2112 * 2113 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2114 * for an ICMPv6 socket will fail." 2115 * The current behavior does not meet RFC3542. 2116 */ 2117 switch (op) { 2118 case SOPT_SET: 2119 if (optlen != sizeof(int)) { 2120 error = EINVAL; 2121 break; 2122 } 2123 error = soopt_to_kbuf(sopt, &optval, 2124 sizeof optval, sizeof optval); 2125 if (error) 2126 break; 2127 if ((optval % 2) != 0) { 2128 /* the API assumes even offset values */ 2129 error = EINVAL; 2130 } else if (so->so_proto->pr_protocol == 2131 IPPROTO_ICMPV6) { 2132 if (optval != icmp6off) 2133 error = EINVAL; 2134 } else 2135 in6p->in6p_cksum = optval; 2136 break; 2137 2138 case SOPT_GET: 2139 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2140 optval = icmp6off; 2141 else 2142 optval = in6p->in6p_cksum; 2143 2144 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 2145 break; 2146 2147 default: 2148 error = EINVAL; 2149 break; 2150 } 2151 break; 2152 2153 default: 2154 error = ENOPROTOOPT; 2155 break; 2156 } 2157 2158 return (error); 2159 } 2160 2161 /* 2162 * Set up IP6 options in pcb for insertion in output packets or 2163 * specifying behavior of outgoing packets. 2164 */ 2165 static int 2166 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2167 struct socket *so, struct sockopt *sopt) 2168 { 2169 int priv = 0; 2170 struct ip6_pktopts *opt = *pktopt; 2171 int error = 0; 2172 2173 /* turn off any old options. */ 2174 if (opt) { 2175 #ifdef DIAGNOSTIC 2176 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2177 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2178 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2179 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 2180 #endif 2181 ip6_clearpktopts(opt, -1); 2182 } else 2183 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2184 *pktopt = NULL; 2185 2186 if (!m || m->m_len == 0) { 2187 /* 2188 * Only turning off any previous options, regardless of 2189 * whether the opt is just created or given. 2190 */ 2191 kfree(opt, M_IP6OPT); 2192 return (0); 2193 } 2194 2195 /* set options specified by user. */ 2196 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 2197 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2198 kfree(opt, M_IP6OPT); 2199 return (error); 2200 } 2201 *pktopt = opt; 2202 return (0); 2203 } 2204 2205 2206 /* 2207 * Below three functions are introduced by merge to RFC3542 2208 */ 2209 2210 static int 2211 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2212 { 2213 void *optdata = NULL; 2214 int optdatalen = 0; 2215 struct ip6_ext *ip6e; 2216 int error = 0; 2217 struct in6_pktinfo null_pktinfo; 2218 int deftclass = 0, on; 2219 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2220 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2221 2222 switch (optname) { 2223 case IPV6_PKTINFO: 2224 if (pktopt && pktopt->ip6po_pktinfo) 2225 optdata = (void *)pktopt->ip6po_pktinfo; 2226 else { 2227 /* XXX: we don't have to do this every time... */ 2228 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2229 optdata = (void *)&null_pktinfo; 2230 } 2231 optdatalen = sizeof(struct in6_pktinfo); 2232 break; 2233 case IPV6_TCLASS: 2234 if (pktopt && pktopt->ip6po_tclass >= 0) 2235 optdata = (void *)&pktopt->ip6po_tclass; 2236 else 2237 optdata = (void *)&deftclass; 2238 optdatalen = sizeof(int); 2239 break; 2240 case IPV6_HOPOPTS: 2241 if (pktopt && pktopt->ip6po_hbh) { 2242 optdata = (void *)pktopt->ip6po_hbh; 2243 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2244 optdatalen = (ip6e->ip6e_len + 1) << 3; 2245 } 2246 break; 2247 case IPV6_RTHDR: 2248 if (pktopt && pktopt->ip6po_rthdr) { 2249 optdata = (void *)pktopt->ip6po_rthdr; 2250 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2251 optdatalen = (ip6e->ip6e_len + 1) << 3; 2252 } 2253 break; 2254 case IPV6_RTHDRDSTOPTS: 2255 if (pktopt && pktopt->ip6po_dest1) { 2256 optdata = (void *)pktopt->ip6po_dest1; 2257 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2258 optdatalen = (ip6e->ip6e_len + 1) << 3; 2259 } 2260 break; 2261 case IPV6_DSTOPTS: 2262 if (pktopt && pktopt->ip6po_dest2) { 2263 optdata = (void *)pktopt->ip6po_dest2; 2264 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2265 optdatalen = (ip6e->ip6e_len + 1) << 3; 2266 } 2267 break; 2268 case IPV6_NEXTHOP: 2269 if (pktopt && pktopt->ip6po_nexthop) { 2270 optdata = (void *)pktopt->ip6po_nexthop; 2271 optdatalen = pktopt->ip6po_nexthop->sa_len; 2272 } 2273 break; 2274 case IPV6_USE_MIN_MTU: 2275 if (pktopt) 2276 optdata = (void *)&pktopt->ip6po_minmtu; 2277 else 2278 optdata = (void *)&defminmtu; 2279 optdatalen = sizeof(int); 2280 break; 2281 case IPV6_DONTFRAG: 2282 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2283 on = 1; 2284 else 2285 on = 0; 2286 optdata = (void *)&on; 2287 optdatalen = sizeof(on); 2288 break; 2289 case IPV6_PREFER_TEMPADDR: 2290 if (pktopt) 2291 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2292 else 2293 optdata = (void *)&defpreftemp; 2294 optdatalen = sizeof(int); 2295 break; 2296 default: /* should not happen */ 2297 #ifdef DIAGNOSTIC 2298 panic("ip6_getpcbopt: unexpected option\n"); 2299 #endif 2300 return (ENOPROTOOPT); 2301 } 2302 2303 soopt_from_kbuf(sopt, optdata, optdatalen); 2304 2305 return (error); 2306 } 2307 2308 /* 2309 * initialize ip6_pktopts. beware that there are non-zero default values in 2310 * the struct. 2311 */ 2312 2313 static int 2314 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2315 { 2316 struct ip6_pktopts *opt; 2317 int priv =0; 2318 if (*pktopt == NULL) { 2319 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2320 init_ip6pktopts(*pktopt); 2321 } 2322 opt = *pktopt; 2323 2324 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2325 } 2326 2327 /* 2328 * initialize ip6_pktopts. beware that there are non-zero default values in 2329 * the struct. 2330 */ 2331 void 2332 init_ip6pktopts(struct ip6_pktopts *opt) 2333 { 2334 2335 bzero(opt, sizeof(*opt)); 2336 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2337 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2338 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2339 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2340 } 2341 2342 void 2343 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2344 { 2345 if (pktopt == NULL) 2346 return; 2347 2348 if (optname == -1 || optname == IPV6_PKTINFO) { 2349 if (pktopt->ip6po_pktinfo) 2350 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2351 pktopt->ip6po_pktinfo = NULL; 2352 } 2353 if (optname == -1 || optname == IPV6_HOPLIMIT) 2354 pktopt->ip6po_hlim = -1; 2355 if (optname == -1 || optname == IPV6_TCLASS) 2356 pktopt->ip6po_tclass = -1; 2357 if (optname == -1 || optname == IPV6_NEXTHOP) { 2358 if (pktopt->ip6po_nextroute.ro_rt) { 2359 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2360 pktopt->ip6po_nextroute.ro_rt = NULL; 2361 } 2362 if (pktopt->ip6po_nexthop) 2363 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2364 pktopt->ip6po_nexthop = NULL; 2365 } 2366 if (optname == -1 || optname == IPV6_HOPOPTS) { 2367 if (pktopt->ip6po_hbh) 2368 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2369 pktopt->ip6po_hbh = NULL; 2370 } 2371 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2372 if (pktopt->ip6po_dest1) 2373 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2374 pktopt->ip6po_dest1 = NULL; 2375 } 2376 if (optname == -1 || optname == IPV6_RTHDR) { 2377 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2378 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2379 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2380 if (pktopt->ip6po_route.ro_rt) { 2381 RTFREE(pktopt->ip6po_route.ro_rt); 2382 pktopt->ip6po_route.ro_rt = NULL; 2383 } 2384 } 2385 if (optname == -1 || optname == IPV6_DSTOPTS) { 2386 if (pktopt->ip6po_dest2) 2387 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2388 pktopt->ip6po_dest2 = NULL; 2389 } 2390 } 2391 2392 #define PKTOPT_EXTHDRCPY(type) \ 2393 do {\ 2394 if (src->type) {\ 2395 int hlen =\ 2396 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2397 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2398 if (dst->type == NULL)\ 2399 goto bad;\ 2400 bcopy(src->type, dst->type, hlen);\ 2401 }\ 2402 } while (0) 2403 2404 struct ip6_pktopts * 2405 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2406 { 2407 struct ip6_pktopts *dst; 2408 2409 if (src == NULL) { 2410 kprintf("ip6_clearpktopts: invalid argument\n"); 2411 return (NULL); 2412 } 2413 2414 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2415 if (dst == NULL) 2416 return (NULL); 2417 2418 dst->ip6po_hlim = src->ip6po_hlim; 2419 if (src->ip6po_pktinfo) { 2420 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2421 M_IP6OPT, canwait); 2422 if (dst->ip6po_pktinfo == NULL) 2423 goto bad; 2424 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2425 } 2426 if (src->ip6po_nexthop) { 2427 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2428 M_IP6OPT, canwait); 2429 if (dst->ip6po_nexthop == NULL) 2430 goto bad; 2431 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2432 src->ip6po_nexthop->sa_len); 2433 } 2434 PKTOPT_EXTHDRCPY(ip6po_hbh); 2435 PKTOPT_EXTHDRCPY(ip6po_dest1); 2436 PKTOPT_EXTHDRCPY(ip6po_dest2); 2437 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2438 return (dst); 2439 2440 bad: 2441 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2442 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2443 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2444 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2445 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2446 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2447 kfree(dst, M_IP6OPT); 2448 return (NULL); 2449 } 2450 2451 static int 2452 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2453 { 2454 if (dst == NULL || src == NULL) { 2455 #ifdef DIAGNOSTIC 2456 kprintf("ip6_clearpktopts: invalid argument\n"); 2457 #endif 2458 return (EINVAL); 2459 } 2460 2461 dst->ip6po_hlim = src->ip6po_hlim; 2462 dst->ip6po_tclass = src->ip6po_tclass; 2463 dst->ip6po_flags = src->ip6po_flags; 2464 if (src->ip6po_pktinfo) { 2465 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2466 M_IP6OPT, canwait); 2467 if (dst->ip6po_pktinfo == NULL) 2468 goto bad; 2469 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2470 } 2471 if (src->ip6po_nexthop) { 2472 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2473 M_IP6OPT, canwait); 2474 if (dst->ip6po_nexthop == NULL) 2475 goto bad; 2476 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2477 src->ip6po_nexthop->sa_len); 2478 } 2479 PKTOPT_EXTHDRCPY(ip6po_hbh); 2480 PKTOPT_EXTHDRCPY(ip6po_dest1); 2481 PKTOPT_EXTHDRCPY(ip6po_dest2); 2482 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2483 return (0); 2484 2485 bad: 2486 ip6_clearpktopts(dst, -1); 2487 return (ENOBUFS); 2488 } 2489 #undef PKTOPT_EXTHDRCPY 2490 2491 void 2492 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2493 { 2494 if (pktopt == NULL) 2495 return; 2496 2497 ip6_clearpktopts(pktopt, -1); 2498 2499 kfree(pktopt, M_IP6OPT); 2500 } 2501 2502 /* 2503 * Set the IP6 multicast options in response to user setsockopt(). 2504 */ 2505 static int 2506 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2507 { 2508 int error = 0; 2509 u_int loop, ifindex; 2510 struct ipv6_mreq *mreq; 2511 struct ifnet *ifp; 2512 struct ip6_moptions *im6o = *im6op; 2513 struct route_in6 ro; 2514 struct sockaddr_in6 *dst; 2515 struct in6_multi_mship *imm; 2516 struct thread *td = curthread; /* XXX */ 2517 2518 if (im6o == NULL) { 2519 /* 2520 * No multicast option buffer attached to the pcb; 2521 * allocate one and initialize to default values. 2522 */ 2523 im6o = (struct ip6_moptions *) 2524 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2525 2526 *im6op = im6o; 2527 im6o->im6o_multicast_ifp = NULL; 2528 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2529 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2530 LIST_INIT(&im6o->im6o_memberships); 2531 } 2532 2533 switch (optname) { 2534 2535 case IPV6_MULTICAST_IF: 2536 /* 2537 * Select the interface for outgoing multicast packets. 2538 */ 2539 if (m == NULL || m->m_len != sizeof(u_int)) { 2540 error = EINVAL; 2541 break; 2542 } 2543 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2544 if (ifindex < 0 || if_index < ifindex) { 2545 error = ENXIO; /* XXX EINVAL? */ 2546 break; 2547 } 2548 ifp = ifindex2ifnet[ifindex]; 2549 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2550 error = EADDRNOTAVAIL; 2551 break; 2552 } 2553 im6o->im6o_multicast_ifp = ifp; 2554 break; 2555 2556 case IPV6_MULTICAST_HOPS: 2557 { 2558 /* 2559 * Set the IP6 hoplimit for outgoing multicast packets. 2560 */ 2561 int optval; 2562 if (m == NULL || m->m_len != sizeof(int)) { 2563 error = EINVAL; 2564 break; 2565 } 2566 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2567 if (optval < -1 || optval >= 256) 2568 error = EINVAL; 2569 else if (optval == -1) 2570 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2571 else 2572 im6o->im6o_multicast_hlim = optval; 2573 break; 2574 } 2575 2576 case IPV6_MULTICAST_LOOP: 2577 /* 2578 * Set the loopback flag for outgoing multicast packets. 2579 * Must be zero or one. 2580 */ 2581 if (m == NULL || m->m_len != sizeof(u_int)) { 2582 error = EINVAL; 2583 break; 2584 } 2585 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2586 if (loop > 1) { 2587 error = EINVAL; 2588 break; 2589 } 2590 im6o->im6o_multicast_loop = loop; 2591 break; 2592 2593 case IPV6_JOIN_GROUP: 2594 /* 2595 * Add a multicast group membership. 2596 * Group must be a valid IP6 multicast address. 2597 */ 2598 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2599 error = EINVAL; 2600 break; 2601 } 2602 mreq = mtod(m, struct ipv6_mreq *); 2603 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2604 /* 2605 * We use the unspecified address to specify to accept 2606 * all multicast addresses. Only super user is allowed 2607 * to do this. 2608 */ 2609 if (priv_check(td, PRIV_ROOT)) 2610 { 2611 error = EACCES; 2612 break; 2613 } 2614 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2615 error = EINVAL; 2616 break; 2617 } 2618 2619 /* 2620 * If the interface is specified, validate it. 2621 */ 2622 if (mreq->ipv6mr_interface < 0 2623 || if_index < mreq->ipv6mr_interface) { 2624 error = ENXIO; /* XXX EINVAL? */ 2625 break; 2626 } 2627 /* 2628 * If no interface was explicitly specified, choose an 2629 * appropriate one according to the given multicast address. 2630 */ 2631 if (mreq->ipv6mr_interface == 0) { 2632 /* 2633 * If the multicast address is in node-local scope, 2634 * the interface should be a loopback interface. 2635 * Otherwise, look up the routing table for the 2636 * address, and choose the outgoing interface. 2637 * XXX: is it a good approach? 2638 */ 2639 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2640 ifp = &loif[0]; 2641 } else { 2642 ro.ro_rt = NULL; 2643 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2644 bzero(dst, sizeof(*dst)); 2645 dst->sin6_len = sizeof(struct sockaddr_in6); 2646 dst->sin6_family = AF_INET6; 2647 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2648 rtalloc((struct route *)&ro); 2649 if (ro.ro_rt == NULL) { 2650 error = EADDRNOTAVAIL; 2651 break; 2652 } 2653 ifp = ro.ro_rt->rt_ifp; 2654 rtfree(ro.ro_rt); 2655 } 2656 } else 2657 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2658 2659 /* 2660 * See if we found an interface, and confirm that it 2661 * supports multicast 2662 */ 2663 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2664 error = EADDRNOTAVAIL; 2665 break; 2666 } 2667 /* 2668 * Put interface index into the multicast address, 2669 * if the address has link-local scope. 2670 */ 2671 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2672 mreq->ipv6mr_multiaddr.s6_addr16[1] 2673 = htons(mreq->ipv6mr_interface); 2674 } 2675 /* 2676 * See if the membership already exists. 2677 */ 2678 for (imm = im6o->im6o_memberships.lh_first; 2679 imm != NULL; imm = imm->i6mm_chain.le_next) 2680 if (imm->i6mm_maddr->in6m_ifp == ifp && 2681 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2682 &mreq->ipv6mr_multiaddr)) 2683 break; 2684 if (imm != NULL) { 2685 error = EADDRINUSE; 2686 break; 2687 } 2688 /* 2689 * Everything looks good; add a new record to the multicast 2690 * address list for the given interface. 2691 */ 2692 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2693 if ((imm->i6mm_maddr = 2694 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2695 kfree(imm, M_IPMADDR); 2696 break; 2697 } 2698 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2699 break; 2700 2701 case IPV6_LEAVE_GROUP: 2702 /* 2703 * Drop a multicast group membership. 2704 * Group must be a valid IP6 multicast address. 2705 */ 2706 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2707 error = EINVAL; 2708 break; 2709 } 2710 mreq = mtod(m, struct ipv6_mreq *); 2711 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2712 if (priv_check(td, PRIV_ROOT)) { 2713 error = EACCES; 2714 break; 2715 } 2716 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2717 error = EINVAL; 2718 break; 2719 } 2720 /* 2721 * If an interface address was specified, get a pointer 2722 * to its ifnet structure. 2723 */ 2724 if (mreq->ipv6mr_interface < 0 2725 || if_index < mreq->ipv6mr_interface) { 2726 error = ENXIO; /* XXX EINVAL? */ 2727 break; 2728 } 2729 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2730 /* 2731 * Put interface index into the multicast address, 2732 * if the address has link-local scope. 2733 */ 2734 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2735 mreq->ipv6mr_multiaddr.s6_addr16[1] 2736 = htons(mreq->ipv6mr_interface); 2737 } 2738 /* 2739 * Find the membership in the membership list. 2740 */ 2741 for (imm = im6o->im6o_memberships.lh_first; 2742 imm != NULL; imm = imm->i6mm_chain.le_next) { 2743 if ((ifp == NULL || 2744 imm->i6mm_maddr->in6m_ifp == ifp) && 2745 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2746 &mreq->ipv6mr_multiaddr)) 2747 break; 2748 } 2749 if (imm == NULL) { 2750 /* Unable to resolve interface */ 2751 error = EADDRNOTAVAIL; 2752 break; 2753 } 2754 /* 2755 * Give up the multicast address record to which the 2756 * membership points. 2757 */ 2758 LIST_REMOVE(imm, i6mm_chain); 2759 in6_delmulti(imm->i6mm_maddr); 2760 kfree(imm, M_IPMADDR); 2761 break; 2762 2763 default: 2764 error = EOPNOTSUPP; 2765 break; 2766 } 2767 2768 /* 2769 * If all options have default values, no need to keep the mbuf. 2770 */ 2771 if (im6o->im6o_multicast_ifp == NULL && 2772 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2773 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2774 im6o->im6o_memberships.lh_first == NULL) { 2775 kfree(*im6op, M_IPMOPTS); 2776 *im6op = NULL; 2777 } 2778 2779 return (error); 2780 } 2781 2782 /* 2783 * Return the IP6 multicast options in response to user getsockopt(). 2784 */ 2785 static int 2786 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2787 { 2788 u_int *hlim, *loop, *ifindex; 2789 2790 *mp = m_get(MB_WAIT, MT_HEADER); /* XXX */ 2791 2792 switch (optname) { 2793 2794 case IPV6_MULTICAST_IF: 2795 ifindex = mtod(*mp, u_int *); 2796 (*mp)->m_len = sizeof(u_int); 2797 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2798 *ifindex = 0; 2799 else 2800 *ifindex = im6o->im6o_multicast_ifp->if_index; 2801 return (0); 2802 2803 case IPV6_MULTICAST_HOPS: 2804 hlim = mtod(*mp, u_int *); 2805 (*mp)->m_len = sizeof(u_int); 2806 if (im6o == NULL) 2807 *hlim = ip6_defmcasthlim; 2808 else 2809 *hlim = im6o->im6o_multicast_hlim; 2810 return (0); 2811 2812 case IPV6_MULTICAST_LOOP: 2813 loop = mtod(*mp, u_int *); 2814 (*mp)->m_len = sizeof(u_int); 2815 if (im6o == NULL) 2816 *loop = ip6_defmcasthlim; 2817 else 2818 *loop = im6o->im6o_multicast_loop; 2819 return (0); 2820 2821 default: 2822 return (EOPNOTSUPP); 2823 } 2824 } 2825 2826 /* 2827 * Discard the IP6 multicast options. 2828 */ 2829 void 2830 ip6_freemoptions(struct ip6_moptions *im6o) 2831 { 2832 struct in6_multi_mship *imm; 2833 2834 if (im6o == NULL) 2835 return; 2836 2837 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2838 LIST_REMOVE(imm, i6mm_chain); 2839 if (imm->i6mm_maddr) 2840 in6_delmulti(imm->i6mm_maddr); 2841 kfree(imm, M_IPMADDR); 2842 } 2843 kfree(im6o, M_IPMOPTS); 2844 } 2845 2846 /* 2847 * Set a particular packet option, as a sticky option or an ancillary data 2848 * item. "len" can be 0 only when it's a sticky option. 2849 * We have 4 cases of combination of "sticky" and "cmsg": 2850 * "sticky=0, cmsg=0": impossible 2851 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2852 * "sticky=1, cmsg=0": RFC3542 socket option 2853 * "sticky=1, cmsg=1": RFC2292 socket option 2854 */ 2855 static int 2856 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2857 int sticky, int cmsg, int uproto, int priv) 2858 { 2859 int minmtupolicy, preftemp; 2860 //int error; 2861 2862 if (!sticky && !cmsg) { 2863 kprintf("ip6_setpktoption: impossible case\n"); 2864 return (EINVAL); 2865 } 2866 2867 /* 2868 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2869 * not be specified in the context of RFC3542. Conversely, 2870 * RFC3542 types should not be specified in the context of RFC2292. 2871 */ 2872 if (!cmsg) { 2873 switch (optname) { 2874 case IPV6_2292PKTINFO: 2875 case IPV6_2292HOPLIMIT: 2876 case IPV6_2292NEXTHOP: 2877 case IPV6_2292HOPOPTS: 2878 case IPV6_2292DSTOPTS: 2879 case IPV6_2292RTHDR: 2880 case IPV6_2292PKTOPTIONS: 2881 return (ENOPROTOOPT); 2882 } 2883 } 2884 if (sticky && cmsg) { 2885 switch (optname) { 2886 case IPV6_PKTINFO: 2887 case IPV6_HOPLIMIT: 2888 case IPV6_NEXTHOP: 2889 case IPV6_HOPOPTS: 2890 case IPV6_DSTOPTS: 2891 case IPV6_RTHDRDSTOPTS: 2892 case IPV6_RTHDR: 2893 case IPV6_USE_MIN_MTU: 2894 case IPV6_DONTFRAG: 2895 case IPV6_TCLASS: 2896 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2897 return (ENOPROTOOPT); 2898 } 2899 } 2900 2901 switch (optname) { 2902 case IPV6_2292PKTINFO: 2903 case IPV6_PKTINFO: 2904 { 2905 struct in6_pktinfo *pktinfo; 2906 if (len != sizeof(struct in6_pktinfo)) 2907 return (EINVAL); 2908 pktinfo = (struct in6_pktinfo *)buf; 2909 2910 /* 2911 * An application can clear any sticky IPV6_PKTINFO option by 2912 * doing a "regular" setsockopt with ipi6_addr being 2913 * in6addr_any and ipi6_ifindex being zero. 2914 * [RFC 3542, Section 6] 2915 */ 2916 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2917 pktinfo->ipi6_ifindex == 0 && 2918 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2919 ip6_clearpktopts(opt, optname); 2920 break; 2921 } 2922 2923 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2924 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2925 return (EINVAL); 2926 } 2927 2928 /* validate the interface index if specified. */ 2929 if (pktinfo->ipi6_ifindex > if_index || 2930 pktinfo->ipi6_ifindex < 0) { 2931 return (ENXIO); 2932 } 2933 /* 2934 * Check if the requested source address is indeed a 2935 * unicast address assigned to the node, and can be 2936 * used as the packet's source address. 2937 */ 2938 if (opt->ip6po_pktinfo != NULL && 2939 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2940 struct in6_ifaddr *ia6; 2941 struct sockaddr_in6 sin6; 2942 2943 bzero(&sin6, sizeof(sin6)); 2944 sin6.sin6_len = sizeof(sin6); 2945 sin6.sin6_family = AF_INET6; 2946 sin6.sin6_addr = 2947 opt->ip6po_pktinfo->ipi6_addr; 2948 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2949 if (ia6 == NULL || 2950 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2951 IN6_IFF_NOTREADY)) != 0) 2952 return (EADDRNOTAVAIL); 2953 } 2954 2955 /* 2956 * We store the address anyway, and let in6_selectsrc() 2957 * validate the specified address. This is because ipi6_addr 2958 * may not have enough information about its scope zone, and 2959 * we may need additional information (such as outgoing 2960 * interface or the scope zone of a destination address) to 2961 * disambiguate the scope. 2962 * XXX: the delay of the validation may confuse the 2963 * application when it is used as a sticky option. 2964 */ 2965 if (opt->ip6po_pktinfo == NULL) { 2966 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2967 M_IP6OPT, M_NOWAIT); 2968 if (opt->ip6po_pktinfo == NULL) 2969 return (ENOBUFS); 2970 } 2971 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2972 break; 2973 } 2974 2975 case IPV6_2292HOPLIMIT: 2976 case IPV6_HOPLIMIT: 2977 { 2978 int *hlimp; 2979 2980 /* 2981 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2982 * to simplify the ordering among hoplimit options. 2983 */ 2984 if (optname == IPV6_HOPLIMIT && sticky) 2985 return (ENOPROTOOPT); 2986 2987 if (len != sizeof(int)) 2988 return (EINVAL); 2989 hlimp = (int *)buf; 2990 if (*hlimp < -1 || *hlimp > 255) 2991 return (EINVAL); 2992 2993 opt->ip6po_hlim = *hlimp; 2994 break; 2995 } 2996 2997 case IPV6_TCLASS: 2998 { 2999 int tclass; 3000 3001 if (len != sizeof(int)) 3002 return (EINVAL); 3003 tclass = *(int *)buf; 3004 if (tclass < -1 || tclass > 255) 3005 return (EINVAL); 3006 3007 opt->ip6po_tclass = tclass; 3008 break; 3009 } 3010 3011 case IPV6_2292NEXTHOP: 3012 case IPV6_NEXTHOP: 3013 if (!priv) 3014 return (EPERM); 3015 3016 if (len == 0) { /* just remove the option */ 3017 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3018 break; 3019 } 3020 3021 /* check if cmsg_len is large enough for sa_len */ 3022 if (len < sizeof(struct sockaddr) || len < *buf) 3023 return (EINVAL); 3024 3025 switch (((struct sockaddr *)buf)->sa_family) { 3026 case AF_INET6: 3027 { 3028 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3029 //int error; 3030 3031 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3032 return (EINVAL); 3033 3034 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3035 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3036 return (EINVAL); 3037 } 3038 break; 3039 } 3040 case AF_LINK: /* should eventually be supported */ 3041 default: 3042 return (EAFNOSUPPORT); 3043 } 3044 3045 /* turn off the previous option, then set the new option. */ 3046 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3047 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 3048 if (opt->ip6po_nexthop == NULL) 3049 return (ENOBUFS); 3050 bcopy(buf, opt->ip6po_nexthop, *buf); 3051 break; 3052 3053 case IPV6_2292HOPOPTS: 3054 case IPV6_HOPOPTS: 3055 { 3056 struct ip6_hbh *hbh; 3057 int hbhlen; 3058 3059 /* 3060 * XXX: We don't allow a non-privileged user to set ANY HbH 3061 * options, since per-option restriction has too much 3062 * overhead. 3063 */ 3064 if (!priv) 3065 return (EPERM); 3066 if (len == 0) { 3067 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3068 break; /* just remove the option */ 3069 } 3070 3071 /* message length validation */ 3072 if (len < sizeof(struct ip6_hbh)) 3073 return (EINVAL); 3074 hbh = (struct ip6_hbh *)buf; 3075 hbhlen = (hbh->ip6h_len + 1) << 3; 3076 if (len != hbhlen) 3077 return (EINVAL); 3078 3079 /* turn off the previous option, then set the new option. */ 3080 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3081 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 3082 if (opt->ip6po_hbh == NULL) 3083 return (ENOBUFS); 3084 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3085 3086 break; 3087 } 3088 3089 case IPV6_2292DSTOPTS: 3090 case IPV6_DSTOPTS: 3091 case IPV6_RTHDRDSTOPTS: 3092 { 3093 struct ip6_dest *dest, **newdest = NULL; 3094 int destlen; 3095 if (!priv) 3096 return (EPERM); 3097 3098 if (len == 0) { 3099 ip6_clearpktopts(opt, optname); 3100 break; /* just remove the option */ 3101 } 3102 3103 /* message length validation */ 3104 if (len < sizeof(struct ip6_dest)) 3105 return (EINVAL); 3106 dest = (struct ip6_dest *)buf; 3107 destlen = (dest->ip6d_len + 1) << 3; 3108 if (len != destlen) 3109 return (EINVAL); 3110 3111 /* 3112 * Determine the position that the destination options header 3113 * should be inserted; before or after the routing header. 3114 */ 3115 switch (optname) { 3116 case IPV6_2292DSTOPTS: 3117 /* 3118 * The old advacned API is ambiguous on this point. 3119 * Our approach is to determine the position based 3120 * according to the existence of a routing header. 3121 * Note, however, that this depends on the order of the 3122 * extension headers in the ancillary data; the 1st 3123 * part of the destination options header must appear 3124 * before the routing header in the ancillary data, 3125 * too. 3126 * RFC3542 solved the ambiguity by introducing 3127 * separate ancillary data or option types. 3128 */ 3129 if (opt->ip6po_rthdr == NULL) 3130 newdest = &opt->ip6po_dest1; 3131 else 3132 newdest = &opt->ip6po_dest2; 3133 break; 3134 case IPV6_RTHDRDSTOPTS: 3135 newdest = &opt->ip6po_dest1; 3136 break; 3137 case IPV6_DSTOPTS: 3138 newdest = &opt->ip6po_dest2; 3139 break; 3140 } 3141 3142 /* turn off the previous option, then set the new option. */ 3143 ip6_clearpktopts(opt, optname); 3144 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 3145 if (*newdest == NULL) 3146 return (ENOBUFS); 3147 bcopy(dest, *newdest, destlen); 3148 3149 break; 3150 } 3151 3152 case IPV6_2292RTHDR: 3153 case IPV6_RTHDR: 3154 { 3155 struct ip6_rthdr *rth; 3156 int rthlen; 3157 3158 if (len == 0) { 3159 ip6_clearpktopts(opt, IPV6_RTHDR); 3160 break; /* just remove the option */ 3161 } 3162 3163 /* message length validation */ 3164 if (len < sizeof(struct ip6_rthdr)) 3165 return (EINVAL); 3166 rth = (struct ip6_rthdr *)buf; 3167 rthlen = (rth->ip6r_len + 1) << 3; 3168 if (len != rthlen) 3169 return (EINVAL); 3170 3171 switch (rth->ip6r_type) { 3172 default: 3173 return (EINVAL); /* not supported */ 3174 } 3175 3176 /* turn off the previous option */ 3177 ip6_clearpktopts(opt, IPV6_RTHDR); 3178 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 3179 if (opt->ip6po_rthdr == NULL) 3180 return (ENOBUFS); 3181 bcopy(rth, opt->ip6po_rthdr, rthlen); 3182 3183 break; 3184 } 3185 3186 case IPV6_USE_MIN_MTU: 3187 if (len != sizeof(int)) 3188 return (EINVAL); 3189 minmtupolicy = *(int *)buf; 3190 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3191 minmtupolicy != IP6PO_MINMTU_DISABLE && 3192 minmtupolicy != IP6PO_MINMTU_ALL) { 3193 return (EINVAL); 3194 } 3195 opt->ip6po_minmtu = minmtupolicy; 3196 break; 3197 3198 case IPV6_DONTFRAG: 3199 if (len != sizeof(int)) 3200 return (EINVAL); 3201 3202 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3203 /* 3204 * we ignore this option for TCP sockets. 3205 * (RFC3542 leaves this case unspecified.) 3206 */ 3207 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3208 } else 3209 opt->ip6po_flags |= IP6PO_DONTFRAG; 3210 break; 3211 3212 case IPV6_PREFER_TEMPADDR: 3213 if (len != sizeof(int)) 3214 return (EINVAL); 3215 preftemp = *(int *)buf; 3216 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3217 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3218 preftemp != IP6PO_TEMPADDR_PREFER) { 3219 return (EINVAL); 3220 } 3221 opt->ip6po_prefer_tempaddr = preftemp; 3222 break; 3223 3224 default: 3225 return (ENOPROTOOPT); 3226 } /* end of switch */ 3227 3228 return (0); 3229 } 3230 3231 3232 /* 3233 * Set IPv6 outgoing packet options based on advanced API. 3234 */ 3235 int 3236 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 3237 struct ip6_pktopts *stickyopt, int uproto, int priv) 3238 { 3239 struct cmsghdr *cm = NULL; 3240 3241 if (control == NULL || opt == NULL) 3242 return (EINVAL); 3243 3244 init_ip6pktopts(opt); 3245 3246 /* 3247 * XXX: Currently, we assume all the optional information is stored 3248 * in a single mbuf. 3249 */ 3250 if (stickyopt) { 3251 int error; 3252 3253 /* 3254 * If stickyopt is provided, make a local copy of the options 3255 * for this particular packet, then override them by ancillary 3256 * objects. 3257 * XXX: copypktopts() does not copy the cached route to a next 3258 * hop (if any). This is not very good in terms of efficiency, 3259 * but we can allow this since this option should be rarely 3260 * used. 3261 */ 3262 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 3263 return (error); 3264 } 3265 3266 /* 3267 * XXX: Currently, we assume all the optional information is stored 3268 * in a single mbuf. 3269 */ 3270 if (control->m_next) 3271 return (EINVAL); 3272 3273 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3274 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3275 int error; 3276 3277 if (control->m_len < CMSG_LEN(0)) 3278 return (EINVAL); 3279 3280 cm = mtod(control, struct cmsghdr *); 3281 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3282 return (EINVAL); 3283 if (cm->cmsg_level != IPPROTO_IPV6) 3284 continue; 3285 3286 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 3287 cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto, priv); 3288 if (error) 3289 return (error); 3290 } 3291 3292 return (0); 3293 } 3294 3295 /* 3296 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3297 * packet to the input queue of a specified interface. Note that this 3298 * calls the output routine of the loopback "driver", but with an interface 3299 * pointer that might NOT be &loif -- easier than replicating that code here. 3300 */ 3301 void 3302 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3303 { 3304 struct mbuf *copym; 3305 struct ip6_hdr *ip6; 3306 3307 copym = m_copy(m, 0, M_COPYALL); 3308 if (copym == NULL) 3309 return; 3310 3311 /* 3312 * Make sure to deep-copy IPv6 header portion in case the data 3313 * is in an mbuf cluster, so that we can safely override the IPv6 3314 * header portion later. 3315 */ 3316 if ((copym->m_flags & M_EXT) != 0 || 3317 copym->m_len < sizeof(struct ip6_hdr)) { 3318 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3319 if (copym == NULL) 3320 return; 3321 } 3322 3323 #ifdef DIAGNOSTIC 3324 if (copym->m_len < sizeof(*ip6)) { 3325 m_freem(copym); 3326 return; 3327 } 3328 #endif 3329 3330 ip6 = mtod(copym, struct ip6_hdr *); 3331 /* 3332 * clear embedded scope identifiers if necessary. 3333 * in6_clearscope will touch the addresses only when necessary. 3334 */ 3335 in6_clearscope(&ip6->ip6_src); 3336 in6_clearscope(&ip6->ip6_dst); 3337 3338 if_simloop(ifp, copym, dst->sin6_family, 0); 3339 } 3340 3341 /* 3342 * Separate the IPv6 header from the payload into its own mbuf. 3343 * 3344 * Returns the new mbuf chain or the original mbuf if no payload. 3345 * Returns NULL if can't allocate new mbuf for header. 3346 */ 3347 static struct mbuf * 3348 ip6_splithdr(struct mbuf *m) 3349 { 3350 struct mbuf *mh; 3351 3352 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3353 return (m); 3354 3355 MGETHDR(mh, MB_DONTWAIT, MT_HEADER); 3356 if (mh == NULL) 3357 return (NULL); 3358 mh->m_len = sizeof(struct ip6_hdr); 3359 M_MOVE_PKTHDR(mh, m); 3360 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3361 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3362 m->m_data += sizeof(struct ip6_hdr); 3363 m->m_len -= sizeof(struct ip6_hdr); 3364 mh->m_next = m; 3365 return (mh); 3366 } 3367 3368 /* 3369 * Compute IPv6 extension header length. 3370 */ 3371 int 3372 ip6_optlen(struct in6pcb *in6p) 3373 { 3374 int len; 3375 3376 if (!in6p->in6p_outputopts) 3377 return 0; 3378 3379 len = 0; 3380 #define elen(x) \ 3381 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3382 3383 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3384 if (in6p->in6p_outputopts->ip6po_rthdr) 3385 /* dest1 is valid with rthdr only */ 3386 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3387 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3388 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3389 return len; 3390 #undef elen 3391 } 3392