ip6_output.c revision 1.171
1 /* $NetBSD: ip6_output.c,v 1.171 2016/06/27 18:35:54 christos Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.171 2016/06/27 18:35:54 christos Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/kauth.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 #include <net/pfil.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet/ip_var.h> 92 #include <netinet/icmp6.h> 93 #include <netinet/in_offload.h> 94 #include <netinet/portalgo.h> 95 #include <netinet6/in6_offload.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/ip6_private.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/ip6protosw.h> 101 #include <netinet6/scope6_var.h> 102 103 #ifdef IPSEC 104 #include <netipsec/ipsec.h> 105 #include <netipsec/ipsec6.h> 106 #include <netipsec/key.h> 107 #include <netipsec/xform.h> 108 #endif 109 110 111 #include <net/net_osdep.h> 112 113 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 114 115 struct ip6_exthdrs { 116 struct mbuf *ip6e_ip6; 117 struct mbuf *ip6e_hbh; 118 struct mbuf *ip6e_dest1; 119 struct mbuf *ip6e_rthdr; 120 struct mbuf *ip6e_dest2; 121 }; 122 123 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 124 kauth_cred_t, int); 125 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 126 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, kauth_cred_t, 127 int, int, int); 128 static int ip6_setmoptions(const struct sockopt *, struct in6pcb *); 129 static int ip6_getmoptions(struct sockopt *, struct in6pcb *); 130 static int ip6_copyexthdr(struct mbuf **, void *, int); 131 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 132 struct ip6_frag **); 133 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 134 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 135 static int ip6_getpmtu(struct route *, struct route *, struct ifnet *, 136 const struct in6_addr *, u_long *, int *); 137 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 138 139 #ifdef RFC2292 140 static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *); 141 #endif 142 143 /* 144 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 145 * header (with pri, len, nxt, hlim, src, dst). 146 * This function may modify ver and hlim only. 147 * The mbuf chain containing the packet will be freed. 148 * The mbuf opt, if present, will not be freed. 149 * 150 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 151 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 152 * which is rt_rmx.rmx_mtu. 153 */ 154 int 155 ip6_output( 156 struct mbuf *m0, 157 struct ip6_pktopts *opt, 158 struct route *ro, 159 int flags, 160 struct ip6_moptions *im6o, 161 struct socket *so, 162 struct ifnet **ifpp /* XXX: just for statistics */ 163 ) 164 { 165 struct ip6_hdr *ip6, *mhip6; 166 struct ifnet *ifp = NULL, *origifp = NULL; 167 struct mbuf *m = m0; 168 int hlen, tlen, len, off; 169 bool tso; 170 struct route ip6route; 171 struct rtentry *rt = NULL; 172 const struct sockaddr_in6 *dst; 173 struct sockaddr_in6 src_sa, dst_sa; 174 int error = 0; 175 struct in6_ifaddr *ia = NULL; 176 u_long mtu; 177 int alwaysfrag, dontfrag; 178 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 179 struct ip6_exthdrs exthdrs; 180 struct in6_addr finaldst, src0, dst0; 181 u_int32_t zone; 182 struct route *ro_pmtu = NULL; 183 int hdrsplit = 0; 184 int needipsec = 0; 185 #ifdef IPSEC 186 struct secpolicy *sp = NULL; 187 #endif 188 struct psref psref, psref_ia; 189 int bound = curlwp_bind(); 190 bool release_psref_ia = false; 191 192 memset(&ip6route, 0, sizeof(ip6route)); 193 194 #ifdef DIAGNOSTIC 195 if ((m->m_flags & M_PKTHDR) == 0) 196 panic("ip6_output: no HDR"); 197 198 if ((m->m_pkthdr.csum_flags & 199 (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { 200 panic("ip6_output: IPv4 checksum offload flags: %d", 201 m->m_pkthdr.csum_flags); 202 } 203 204 if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 205 (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 206 panic("ip6_output: conflicting checksum offload flags: %d", 207 m->m_pkthdr.csum_flags); 208 } 209 #endif 210 211 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 212 213 #define MAKE_EXTHDR(hp, mp) \ 214 do { \ 215 if (hp) { \ 216 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 217 error = ip6_copyexthdr((mp), (void *)(hp), \ 218 ((eh)->ip6e_len + 1) << 3); \ 219 if (error) \ 220 goto freehdrs; \ 221 } \ 222 } while (/*CONSTCOND*/ 0) 223 224 memset(&exthdrs, 0, sizeof(exthdrs)); 225 if (opt) { 226 /* Hop-by-Hop options header */ 227 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 228 /* Destination options header(1st part) */ 229 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 230 /* Routing header */ 231 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 232 /* Destination options header(2nd part) */ 233 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 234 } 235 236 /* 237 * Calculate the total length of the extension header chain. 238 * Keep the length of the unfragmentable part for fragmentation. 239 */ 240 optlen = 0; 241 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 242 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 243 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 244 unfragpartlen = optlen + sizeof(struct ip6_hdr); 245 /* NOTE: we don't add AH/ESP length here. do that later. */ 246 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 247 248 #ifdef IPSEC 249 if (ipsec_used) { 250 /* Check the security policy (SP) for the packet */ 251 252 sp = ipsec6_check_policy(m, so, flags, &needipsec, &error); 253 if (error != 0) { 254 /* 255 * Hack: -EINVAL is used to signal that a packet 256 * should be silently discarded. This is typically 257 * because we asked key management for an SA and 258 * it was delayed (e.g. kicked up to IKE). 259 */ 260 if (error == -EINVAL) 261 error = 0; 262 goto freehdrs; 263 } 264 } 265 #endif /* IPSEC */ 266 267 268 if (needipsec && 269 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 270 in6_delayed_cksum(m); 271 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 272 } 273 274 275 /* 276 * If we need IPsec, or there is at least one extension header, 277 * separate IP6 header from the payload. 278 */ 279 if ((needipsec || optlen) && !hdrsplit) { 280 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 281 m = NULL; 282 goto freehdrs; 283 } 284 m = exthdrs.ip6e_ip6; 285 hdrsplit++; 286 } 287 288 /* adjust pointer */ 289 ip6 = mtod(m, struct ip6_hdr *); 290 291 /* adjust mbuf packet header length */ 292 m->m_pkthdr.len += optlen; 293 plen = m->m_pkthdr.len - sizeof(*ip6); 294 295 /* If this is a jumbo payload, insert a jumbo payload option. */ 296 if (plen > IPV6_MAXPACKET) { 297 if (!hdrsplit) { 298 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 299 m = NULL; 300 goto freehdrs; 301 } 302 m = exthdrs.ip6e_ip6; 303 hdrsplit++; 304 } 305 /* adjust pointer */ 306 ip6 = mtod(m, struct ip6_hdr *); 307 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 308 goto freehdrs; 309 optlen += 8; /* XXX JUMBOOPTLEN */ 310 ip6->ip6_plen = 0; 311 } else 312 ip6->ip6_plen = htons(plen); 313 314 /* 315 * Concatenate headers and fill in next header fields. 316 * Here we have, on "m" 317 * IPv6 payload 318 * and we insert headers accordingly. Finally, we should be getting: 319 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 320 * 321 * during the header composing process, "m" points to IPv6 header. 322 * "mprev" points to an extension header prior to esp. 323 */ 324 { 325 u_char *nexthdrp = &ip6->ip6_nxt; 326 struct mbuf *mprev = m; 327 328 /* 329 * we treat dest2 specially. this makes IPsec processing 330 * much easier. the goal here is to make mprev point the 331 * mbuf prior to dest2. 332 * 333 * result: IPv6 dest2 payload 334 * m and mprev will point to IPv6 header. 335 */ 336 if (exthdrs.ip6e_dest2) { 337 if (!hdrsplit) 338 panic("assumption failed: hdr not split"); 339 exthdrs.ip6e_dest2->m_next = m->m_next; 340 m->m_next = exthdrs.ip6e_dest2; 341 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 342 ip6->ip6_nxt = IPPROTO_DSTOPTS; 343 } 344 345 #define MAKE_CHAIN(m, mp, p, i)\ 346 do {\ 347 if (m) {\ 348 if (!hdrsplit) \ 349 panic("assumption failed: hdr not split"); \ 350 *mtod((m), u_char *) = *(p);\ 351 *(p) = (i);\ 352 p = mtod((m), u_char *);\ 353 (m)->m_next = (mp)->m_next;\ 354 (mp)->m_next = (m);\ 355 (mp) = (m);\ 356 }\ 357 } while (/*CONSTCOND*/ 0) 358 /* 359 * result: IPv6 hbh dest1 rthdr dest2 payload 360 * m will point to IPv6 header. mprev will point to the 361 * extension header prior to dest2 (rthdr in the above case). 362 */ 363 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 364 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 365 IPPROTO_DSTOPTS); 366 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 367 IPPROTO_ROUTING); 368 369 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, 370 sizeof(struct ip6_hdr) + optlen); 371 } 372 373 /* 374 * If there is a routing header, replace destination address field 375 * with the first hop of the routing header. 376 */ 377 if (exthdrs.ip6e_rthdr) { 378 struct ip6_rthdr *rh; 379 struct ip6_rthdr0 *rh0; 380 struct in6_addr *addr; 381 struct sockaddr_in6 sa; 382 383 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 384 struct ip6_rthdr *)); 385 finaldst = ip6->ip6_dst; 386 switch (rh->ip6r_type) { 387 case IPV6_RTHDR_TYPE_0: 388 rh0 = (struct ip6_rthdr0 *)rh; 389 addr = (struct in6_addr *)(rh0 + 1); 390 391 /* 392 * construct a sockaddr_in6 form of 393 * the first hop. 394 * 395 * XXX: we may not have enough 396 * information about its scope zone; 397 * there is no standard API to pass 398 * the information from the 399 * application. 400 */ 401 sockaddr_in6_init(&sa, addr, 0, 0, 0); 402 if ((error = sa6_embedscope(&sa, 403 ip6_use_defzone)) != 0) { 404 goto bad; 405 } 406 ip6->ip6_dst = sa.sin6_addr; 407 (void)memmove(&addr[0], &addr[1], 408 sizeof(struct in6_addr) * 409 (rh0->ip6r0_segleft - 1)); 410 addr[rh0->ip6r0_segleft - 1] = finaldst; 411 /* XXX */ 412 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 413 break; 414 default: /* is it possible? */ 415 error = EINVAL; 416 goto bad; 417 } 418 } 419 420 /* Source address validation */ 421 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 422 (flags & IPV6_UNSPECSRC) == 0) { 423 error = EOPNOTSUPP; 424 IP6_STATINC(IP6_STAT_BADSCOPE); 425 goto bad; 426 } 427 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 428 error = EOPNOTSUPP; 429 IP6_STATINC(IP6_STAT_BADSCOPE); 430 goto bad; 431 } 432 433 IP6_STATINC(IP6_STAT_LOCALOUT); 434 435 /* 436 * Route packet. 437 */ 438 /* initialize cached route */ 439 if (ro == NULL) { 440 ro = &ip6route; 441 } 442 ro_pmtu = ro; 443 if (opt && opt->ip6po_rthdr) 444 ro = &opt->ip6po_route; 445 446 /* 447 * if specified, try to fill in the traffic class field. 448 * do not override if a non-zero value is already set. 449 * we check the diffserv field and the ecn field separately. 450 */ 451 if (opt && opt->ip6po_tclass >= 0) { 452 int mask = 0; 453 454 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 455 mask |= 0xfc; 456 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 457 mask |= 0x03; 458 if (mask != 0) 459 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 460 } 461 462 /* fill in or override the hop limit field, if necessary. */ 463 if (opt && opt->ip6po_hlim != -1) 464 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 465 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 466 if (im6o != NULL) 467 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 468 else 469 ip6->ip6_hlim = ip6_defmcasthlim; 470 } 471 472 #ifdef IPSEC 473 if (needipsec) { 474 int s = splsoftnet(); 475 error = ipsec6_process_packet(m, sp->req); 476 477 /* 478 * Preserve KAME behaviour: ENOENT can be returned 479 * when an SA acquire is in progress. Don't propagate 480 * this to user-level; it confuses applications. 481 * XXX this will go away when the SADB is redone. 482 */ 483 if (error == ENOENT) 484 error = 0; 485 splx(s); 486 goto done; 487 } 488 #endif /* IPSEC */ 489 490 /* adjust pointer */ 491 ip6 = mtod(m, struct ip6_hdr *); 492 493 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 494 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 495 &ifp, &psref, &rt, 0)) != 0) { 496 if (ifp != NULL) 497 in6_ifstat_inc(ifp, ifs6_out_discard); 498 goto bad; 499 } 500 if (rt == NULL) { 501 /* 502 * If in6_selectroute() does not return a route entry, 503 * dst may not have been updated. 504 */ 505 error = rtcache_setdst(ro, sin6tosa(&dst_sa)); 506 if (error) { 507 goto bad; 508 } 509 } 510 511 /* 512 * then rt (for unicast) and ifp must be non-NULL valid values. 513 */ 514 if ((flags & IPV6_FORWARDING) == 0) { 515 /* XXX: the FORWARDING flag can be set for mrouting. */ 516 in6_ifstat_inc(ifp, ifs6_out_request); 517 } 518 if (rt != NULL) { 519 ia = (struct in6_ifaddr *)(rt->rt_ifa); 520 rt->rt_use++; 521 } 522 523 /* 524 * The outgoing interface must be in the zone of source and 525 * destination addresses. We should use ia_ifp to support the 526 * case of sending packets to an address of our own. 527 */ 528 if (ia != NULL && ia->ia_ifp) { 529 origifp = ia->ia_ifp; 530 if_acquire_NOMPSAFE(origifp, &psref_ia); 531 release_psref_ia = true; 532 } else 533 origifp = ifp; 534 535 src0 = ip6->ip6_src; 536 if (in6_setscope(&src0, origifp, &zone)) 537 goto badscope; 538 sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); 539 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 540 goto badscope; 541 542 dst0 = ip6->ip6_dst; 543 if (in6_setscope(&dst0, origifp, &zone)) 544 goto badscope; 545 /* re-initialize to be sure */ 546 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 547 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 548 goto badscope; 549 550 /* scope check is done. */ 551 552 if (rt == NULL || IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 553 dst = satocsin6(rtcache_getdst(ro)); 554 KASSERT(dst != NULL); 555 } else if (opt && rtcache_validate(&opt->ip6po_nextroute) != NULL) { 556 /* 557 * The nexthop is explicitly specified by the 558 * application. We assume the next hop is an IPv6 559 * address. 560 */ 561 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 562 } else if ((rt->rt_flags & RTF_GATEWAY)) 563 dst = (struct sockaddr_in6 *)rt->rt_gateway; 564 else 565 dst = satocsin6(rtcache_getdst(ro)); 566 567 /* 568 * XXXXXX: original code follows: 569 */ 570 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 571 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 572 else { 573 struct in6_multi *in6m; 574 575 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 576 577 in6_ifstat_inc(ifp, ifs6_out_mcast); 578 579 /* 580 * Confirm that the outgoing interface supports multicast. 581 */ 582 if (!(ifp->if_flags & IFF_MULTICAST)) { 583 IP6_STATINC(IP6_STAT_NOROUTE); 584 in6_ifstat_inc(ifp, ifs6_out_discard); 585 error = ENETUNREACH; 586 goto bad; 587 } 588 589 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 590 if (in6m != NULL && 591 (im6o == NULL || im6o->im6o_multicast_loop)) { 592 /* 593 * If we belong to the destination multicast group 594 * on the outgoing interface, and the caller did not 595 * forbid loopback, loop back a copy. 596 */ 597 KASSERT(dst != NULL); 598 ip6_mloopback(ifp, m, dst); 599 } else { 600 /* 601 * If we are acting as a multicast router, perform 602 * multicast forwarding as if the packet had just 603 * arrived on the interface to which we are about 604 * to send. The multicast forwarding function 605 * recursively calls this function, using the 606 * IPV6_FORWARDING flag to prevent infinite recursion. 607 * 608 * Multicasts that are looped back by ip6_mloopback(), 609 * above, will be forwarded by the ip6_input() routine, 610 * if necessary. 611 */ 612 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 613 if (ip6_mforward(ip6, ifp, m) != 0) { 614 m_freem(m); 615 goto done; 616 } 617 } 618 } 619 /* 620 * Multicasts with a hoplimit of zero may be looped back, 621 * above, but must not be transmitted on a network. 622 * Also, multicasts addressed to the loopback interface 623 * are not sent -- the above call to ip6_mloopback() will 624 * loop back a copy if this host actually belongs to the 625 * destination group on the loopback interface. 626 */ 627 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 628 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 629 m_freem(m); 630 goto done; 631 } 632 } 633 634 /* 635 * Fill the outgoing inteface to tell the upper layer 636 * to increment per-interface statistics. 637 */ 638 if (ifpp) 639 *ifpp = ifp; 640 641 /* Determine path MTU. */ 642 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 643 &alwaysfrag)) != 0) 644 goto bad; 645 646 /* 647 * The caller of this function may specify to use the minimum MTU 648 * in some cases. 649 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 650 * setting. The logic is a bit complicated; by default, unicast 651 * packets will follow path MTU while multicast packets will be sent at 652 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 653 * including unicast ones will be sent at the minimum MTU. Multicast 654 * packets will always be sent at the minimum MTU unless 655 * IP6PO_MINMTU_DISABLE is explicitly specified. 656 * See RFC 3542 for more details. 657 */ 658 if (mtu > IPV6_MMTU) { 659 if ((flags & IPV6_MINMTU)) 660 mtu = IPV6_MMTU; 661 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 662 mtu = IPV6_MMTU; 663 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 664 (opt == NULL || 665 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 666 mtu = IPV6_MMTU; 667 } 668 } 669 670 /* 671 * clear embedded scope identifiers if necessary. 672 * in6_clearscope will touch the addresses only when necessary. 673 */ 674 in6_clearscope(&ip6->ip6_src); 675 in6_clearscope(&ip6->ip6_dst); 676 677 /* 678 * If the outgoing packet contains a hop-by-hop options header, 679 * it must be examined and processed even by the source node. 680 * (RFC 2460, section 4.) 681 */ 682 if (ip6->ip6_nxt == IPV6_HOPOPTS) { 683 u_int32_t dummy1; /* XXX unused */ 684 u_int32_t dummy2; /* XXX unused */ 685 int hoff = sizeof(struct ip6_hdr); 686 687 if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) { 688 /* m was already freed at this point */ 689 error = EINVAL;/* better error? */ 690 goto done; 691 } 692 693 ip6 = mtod(m, struct ip6_hdr *); 694 } 695 696 /* 697 * Run through list of hooks for output packets. 698 */ 699 if ((error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 700 goto done; 701 if (m == NULL) 702 goto done; 703 ip6 = mtod(m, struct ip6_hdr *); 704 705 /* 706 * Send the packet to the outgoing interface. 707 * If necessary, do IPv6 fragmentation before sending. 708 * 709 * the logic here is rather complex: 710 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 711 * 1-a: send as is if tlen <= path mtu 712 * 1-b: fragment if tlen > path mtu 713 * 714 * 2: if user asks us not to fragment (dontfrag == 1) 715 * 2-a: send as is if tlen <= interface mtu 716 * 2-b: error if tlen > interface mtu 717 * 718 * 3: if we always need to attach fragment header (alwaysfrag == 1) 719 * always fragment 720 * 721 * 4: if dontfrag == 1 && alwaysfrag == 1 722 * error, as we cannot handle this conflicting request 723 */ 724 tlen = m->m_pkthdr.len; 725 tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; 726 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 727 dontfrag = 1; 728 else 729 dontfrag = 0; 730 731 if (dontfrag && alwaysfrag) { /* case 4 */ 732 /* conflicting request - can't transmit */ 733 error = EMSGSIZE; 734 goto bad; 735 } 736 if (dontfrag && (!tso && tlen > IN6_LINKMTU(ifp))) { /* case 2-b */ 737 /* 738 * Even if the DONTFRAG option is specified, we cannot send the 739 * packet when the data length is larger than the MTU of the 740 * outgoing interface. 741 * Notify the error by sending IPV6_PATHMTU ancillary data as 742 * well as returning an error code (the latter is not described 743 * in the API spec.) 744 */ 745 u_int32_t mtu32; 746 struct ip6ctlparam ip6cp; 747 748 mtu32 = (u_int32_t)mtu; 749 memset(&ip6cp, 0, sizeof(ip6cp)); 750 ip6cp.ip6c_cmdarg = (void *)&mtu32; 751 pfctlinput2(PRC_MSGSIZE, 752 rtcache_getdst(ro_pmtu), &ip6cp); 753 754 error = EMSGSIZE; 755 goto bad; 756 } 757 758 /* 759 * transmit packet without fragmentation 760 */ 761 if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { 762 /* case 1-a and 2-a */ 763 struct in6_ifaddr *ia6; 764 int sw_csum; 765 766 ip6 = mtod(m, struct ip6_hdr *); 767 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 768 if (ia6) { 769 /* Record statistics for this interface address. */ 770 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 771 } 772 773 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 774 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 775 if (IN6_NEED_CHECKSUM(ifp, 776 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 777 in6_delayed_cksum(m); 778 } 779 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 780 } 781 782 KASSERT(dst != NULL); 783 if (__predict_true(!tso || 784 (ifp->if_capenable & IFCAP_TSOv6) != 0)) { 785 error = nd6_output(ifp, origifp, m, dst, rt); 786 } else { 787 error = ip6_tso_output(ifp, origifp, m, dst, rt); 788 } 789 goto done; 790 } 791 792 if (tso) { 793 error = EINVAL; /* XXX */ 794 goto bad; 795 } 796 797 /* 798 * try to fragment the packet. case 1-b and 3 799 */ 800 if (mtu < IPV6_MMTU) { 801 /* path MTU cannot be less than IPV6_MMTU */ 802 error = EMSGSIZE; 803 in6_ifstat_inc(ifp, ifs6_out_fragfail); 804 goto bad; 805 } else if (ip6->ip6_plen == 0) { 806 /* jumbo payload cannot be fragmented */ 807 error = EMSGSIZE; 808 in6_ifstat_inc(ifp, ifs6_out_fragfail); 809 goto bad; 810 } else { 811 struct mbuf **mnext, *m_frgpart; 812 struct ip6_frag *ip6f; 813 u_int32_t id = htonl(ip6_randomid()); 814 u_char nextproto; 815 #if 0 /* see below */ 816 struct ip6ctlparam ip6cp; 817 u_int32_t mtu32; 818 #endif 819 820 /* 821 * Too large for the destination or interface; 822 * fragment if possible. 823 * Must be able to put at least 8 bytes per fragment. 824 */ 825 hlen = unfragpartlen; 826 if (mtu > IPV6_MAXPACKET) 827 mtu = IPV6_MAXPACKET; 828 829 #if 0 830 /* 831 * It is believed this code is a leftover from the 832 * development of the IPV6_RECVPATHMTU sockopt and 833 * associated work to implement RFC3542. 834 * It's not entirely clear what the intent of the API 835 * is at this point, so disable this code for now. 836 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 837 * will send notifications if the application requests. 838 */ 839 840 /* Notify a proper path MTU to applications. */ 841 mtu32 = (u_int32_t)mtu; 842 memset(&ip6cp, 0, sizeof(ip6cp)); 843 ip6cp.ip6c_cmdarg = (void *)&mtu32; 844 pfctlinput2(PRC_MSGSIZE, 845 rtcache_getdst(ro_pmtu), &ip6cp); 846 #endif 847 848 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 849 if (len < 8) { 850 error = EMSGSIZE; 851 in6_ifstat_inc(ifp, ifs6_out_fragfail); 852 goto bad; 853 } 854 855 mnext = &m->m_nextpkt; 856 857 /* 858 * Change the next header field of the last header in the 859 * unfragmentable part. 860 */ 861 if (exthdrs.ip6e_rthdr) { 862 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 863 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 864 } else if (exthdrs.ip6e_dest1) { 865 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 866 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 867 } else if (exthdrs.ip6e_hbh) { 868 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 869 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 870 } else { 871 nextproto = ip6->ip6_nxt; 872 ip6->ip6_nxt = IPPROTO_FRAGMENT; 873 } 874 875 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 876 != 0) { 877 if (IN6_NEED_CHECKSUM(ifp, 878 m->m_pkthdr.csum_flags & 879 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 880 in6_delayed_cksum(m); 881 } 882 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 883 } 884 885 /* 886 * Loop through length of segment after first fragment, 887 * make new header and copy data of each part and link onto 888 * chain. 889 */ 890 m0 = m; 891 for (off = hlen; off < tlen; off += len) { 892 struct mbuf *mlast; 893 894 MGETHDR(m, M_DONTWAIT, MT_HEADER); 895 if (!m) { 896 error = ENOBUFS; 897 IP6_STATINC(IP6_STAT_ODROPPED); 898 goto sendorfree; 899 } 900 m_reset_rcvif(m); 901 m->m_flags = m0->m_flags & M_COPYFLAGS; 902 *mnext = m; 903 mnext = &m->m_nextpkt; 904 m->m_data += max_linkhdr; 905 mhip6 = mtod(m, struct ip6_hdr *); 906 *mhip6 = *ip6; 907 m->m_len = sizeof(*mhip6); 908 /* 909 * ip6f must be valid if error is 0. But how 910 * can a compiler be expected to infer this? 911 */ 912 ip6f = NULL; 913 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 914 if (error) { 915 IP6_STATINC(IP6_STAT_ODROPPED); 916 goto sendorfree; 917 } 918 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 919 if (off + len >= tlen) 920 len = tlen - off; 921 else 922 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 923 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 924 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 925 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 926 error = ENOBUFS; 927 IP6_STATINC(IP6_STAT_ODROPPED); 928 goto sendorfree; 929 } 930 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 931 ; 932 mlast->m_next = m_frgpart; 933 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 934 m_reset_rcvif(m); 935 ip6f->ip6f_reserved = 0; 936 ip6f->ip6f_ident = id; 937 ip6f->ip6f_nxt = nextproto; 938 IP6_STATINC(IP6_STAT_OFRAGMENTS); 939 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 940 } 941 942 in6_ifstat_inc(ifp, ifs6_out_fragok); 943 } 944 945 /* 946 * Remove leading garbages. 947 */ 948 sendorfree: 949 m = m0->m_nextpkt; 950 m0->m_nextpkt = 0; 951 m_freem(m0); 952 for (m0 = m; m; m = m0) { 953 m0 = m->m_nextpkt; 954 m->m_nextpkt = 0; 955 if (error == 0) { 956 struct in6_ifaddr *ia6; 957 ip6 = mtod(m, struct ip6_hdr *); 958 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 959 if (ia6) { 960 /* 961 * Record statistics for this interface 962 * address. 963 */ 964 ia6->ia_ifa.ifa_data.ifad_outbytes += 965 m->m_pkthdr.len; 966 } 967 KASSERT(dst != NULL); 968 error = nd6_output(ifp, origifp, m, dst, rt); 969 } else 970 m_freem(m); 971 } 972 973 if (error == 0) 974 IP6_STATINC(IP6_STAT_FRAGMENTED); 975 976 done: 977 rtcache_free(&ip6route); 978 979 #ifdef IPSEC 980 if (sp != NULL) 981 KEY_FREESP(&sp); 982 #endif /* IPSEC */ 983 984 if_put(ifp, &psref); 985 if (release_psref_ia) 986 if_put(origifp, &psref_ia); 987 curlwp_bindx(bound); 988 989 return (error); 990 991 freehdrs: 992 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 993 m_freem(exthdrs.ip6e_dest1); 994 m_freem(exthdrs.ip6e_rthdr); 995 m_freem(exthdrs.ip6e_dest2); 996 /* FALLTHROUGH */ 997 bad: 998 m_freem(m); 999 goto done; 1000 badscope: 1001 IP6_STATINC(IP6_STAT_BADSCOPE); 1002 in6_ifstat_inc(origifp, ifs6_out_discard); 1003 if (error == 0) 1004 error = EHOSTUNREACH; /* XXX */ 1005 goto bad; 1006 } 1007 1008 static int 1009 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1010 { 1011 struct mbuf *m; 1012 1013 if (hlen > MCLBYTES) 1014 return (ENOBUFS); /* XXX */ 1015 1016 MGET(m, M_DONTWAIT, MT_DATA); 1017 if (!m) 1018 return (ENOBUFS); 1019 1020 if (hlen > MLEN) { 1021 MCLGET(m, M_DONTWAIT); 1022 if ((m->m_flags & M_EXT) == 0) { 1023 m_free(m); 1024 return (ENOBUFS); 1025 } 1026 } 1027 m->m_len = hlen; 1028 if (hdr) 1029 bcopy(hdr, mtod(m, void *), hlen); 1030 1031 *mp = m; 1032 return (0); 1033 } 1034 1035 /* 1036 * Process a delayed payload checksum calculation. 1037 */ 1038 void 1039 in6_delayed_cksum(struct mbuf *m) 1040 { 1041 uint16_t csum, offset; 1042 1043 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1044 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1045 KASSERT((m->m_pkthdr.csum_flags 1046 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1047 1048 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1049 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1050 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1051 csum = 0xffff; 1052 } 1053 1054 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1055 if ((offset + sizeof(csum)) > m->m_len) { 1056 m_copyback(m, offset, sizeof(csum), &csum); 1057 } else { 1058 *(uint16_t *)(mtod(m, char *) + offset) = csum; 1059 } 1060 } 1061 1062 /* 1063 * Insert jumbo payload option. 1064 */ 1065 static int 1066 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1067 { 1068 struct mbuf *mopt; 1069 u_int8_t *optbuf; 1070 u_int32_t v; 1071 1072 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1073 1074 /* 1075 * If there is no hop-by-hop options header, allocate new one. 1076 * If there is one but it doesn't have enough space to store the 1077 * jumbo payload option, allocate a cluster to store the whole options. 1078 * Otherwise, use it to store the options. 1079 */ 1080 if (exthdrs->ip6e_hbh == 0) { 1081 MGET(mopt, M_DONTWAIT, MT_DATA); 1082 if (mopt == 0) 1083 return (ENOBUFS); 1084 mopt->m_len = JUMBOOPTLEN; 1085 optbuf = mtod(mopt, u_int8_t *); 1086 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1087 exthdrs->ip6e_hbh = mopt; 1088 } else { 1089 struct ip6_hbh *hbh; 1090 1091 mopt = exthdrs->ip6e_hbh; 1092 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1093 /* 1094 * XXX assumption: 1095 * - exthdrs->ip6e_hbh is not referenced from places 1096 * other than exthdrs. 1097 * - exthdrs->ip6e_hbh is not an mbuf chain. 1098 */ 1099 int oldoptlen = mopt->m_len; 1100 struct mbuf *n; 1101 1102 /* 1103 * XXX: give up if the whole (new) hbh header does 1104 * not fit even in an mbuf cluster. 1105 */ 1106 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1107 return (ENOBUFS); 1108 1109 /* 1110 * As a consequence, we must always prepare a cluster 1111 * at this point. 1112 */ 1113 MGET(n, M_DONTWAIT, MT_DATA); 1114 if (n) { 1115 MCLGET(n, M_DONTWAIT); 1116 if ((n->m_flags & M_EXT) == 0) { 1117 m_freem(n); 1118 n = NULL; 1119 } 1120 } 1121 if (!n) 1122 return (ENOBUFS); 1123 n->m_len = oldoptlen + JUMBOOPTLEN; 1124 bcopy(mtod(mopt, void *), mtod(n, void *), 1125 oldoptlen); 1126 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1127 m_freem(mopt); 1128 mopt = exthdrs->ip6e_hbh = n; 1129 } else { 1130 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1131 mopt->m_len += JUMBOOPTLEN; 1132 } 1133 optbuf[0] = IP6OPT_PADN; 1134 optbuf[1] = 0; 1135 1136 /* 1137 * Adjust the header length according to the pad and 1138 * the jumbo payload option. 1139 */ 1140 hbh = mtod(mopt, struct ip6_hbh *); 1141 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1142 } 1143 1144 /* fill in the option. */ 1145 optbuf[2] = IP6OPT_JUMBO; 1146 optbuf[3] = 4; 1147 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1148 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1149 1150 /* finally, adjust the packet header length */ 1151 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1152 1153 return (0); 1154 #undef JUMBOOPTLEN 1155 } 1156 1157 /* 1158 * Insert fragment header and copy unfragmentable header portions. 1159 * 1160 * *frghdrp will not be read, and it is guaranteed that either an 1161 * error is returned or that *frghdrp will point to space allocated 1162 * for the fragment header. 1163 */ 1164 static int 1165 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1166 struct ip6_frag **frghdrp) 1167 { 1168 struct mbuf *n, *mlast; 1169 1170 if (hlen > sizeof(struct ip6_hdr)) { 1171 n = m_copym(m0, sizeof(struct ip6_hdr), 1172 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1173 if (n == 0) 1174 return (ENOBUFS); 1175 m->m_next = n; 1176 } else 1177 n = m; 1178 1179 /* Search for the last mbuf of unfragmentable part. */ 1180 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1181 ; 1182 1183 if ((mlast->m_flags & M_EXT) == 0 && 1184 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1185 /* use the trailing space of the last mbuf for the fragment hdr */ 1186 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1187 mlast->m_len); 1188 mlast->m_len += sizeof(struct ip6_frag); 1189 m->m_pkthdr.len += sizeof(struct ip6_frag); 1190 } else { 1191 /* allocate a new mbuf for the fragment header */ 1192 struct mbuf *mfrg; 1193 1194 MGET(mfrg, M_DONTWAIT, MT_DATA); 1195 if (mfrg == 0) 1196 return (ENOBUFS); 1197 mfrg->m_len = sizeof(struct ip6_frag); 1198 *frghdrp = mtod(mfrg, struct ip6_frag *); 1199 mlast->m_next = mfrg; 1200 } 1201 1202 return (0); 1203 } 1204 1205 static int 1206 ip6_getpmtu(struct route *ro_pmtu, struct route *ro, struct ifnet *ifp, 1207 const struct in6_addr *dst, u_long *mtup, int *alwaysfragp) 1208 { 1209 struct rtentry *rt; 1210 u_int32_t mtu = 0; 1211 int alwaysfrag = 0; 1212 int error = 0; 1213 1214 if (ro_pmtu != ro) { 1215 union { 1216 struct sockaddr dst; 1217 struct sockaddr_in6 dst6; 1218 } u; 1219 1220 /* The first hop and the final destination may differ. */ 1221 sockaddr_in6_init(&u.dst6, dst, 0, 0, 0); 1222 rt = rtcache_lookup(ro_pmtu, &u.dst); 1223 } else 1224 rt = rtcache_validate(ro_pmtu); 1225 if (rt != NULL) { 1226 u_int32_t ifmtu; 1227 1228 if (ifp == NULL) 1229 ifp = rt->rt_ifp; 1230 ifmtu = IN6_LINKMTU(ifp); 1231 mtu = rt->rt_rmx.rmx_mtu; 1232 if (mtu == 0) 1233 mtu = ifmtu; 1234 else if (mtu < IPV6_MMTU) { 1235 /* 1236 * RFC2460 section 5, last paragraph: 1237 * if we record ICMPv6 too big message with 1238 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1239 * or smaller, with fragment header attached. 1240 * (fragment header is needed regardless from the 1241 * packet size, for translators to identify packets) 1242 */ 1243 alwaysfrag = 1; 1244 mtu = IPV6_MMTU; 1245 } else if (mtu > ifmtu) { 1246 /* 1247 * The MTU on the route is larger than the MTU on 1248 * the interface! This shouldn't happen, unless the 1249 * MTU of the interface has been changed after the 1250 * interface was brought up. Change the MTU in the 1251 * route to match the interface MTU (as long as the 1252 * field isn't locked). 1253 */ 1254 mtu = ifmtu; 1255 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1256 rt->rt_rmx.rmx_mtu = mtu; 1257 } 1258 } else if (ifp) { 1259 mtu = IN6_LINKMTU(ifp); 1260 } else 1261 error = EHOSTUNREACH; /* XXX */ 1262 1263 *mtup = mtu; 1264 if (alwaysfragp) 1265 *alwaysfragp = alwaysfrag; 1266 return (error); 1267 } 1268 1269 /* 1270 * IP6 socket option processing. 1271 */ 1272 int 1273 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1274 { 1275 int optdatalen, uproto; 1276 void *optdata; 1277 struct in6pcb *in6p = sotoin6pcb(so); 1278 struct ip_moptions **mopts; 1279 int error, optval; 1280 int level, optname; 1281 1282 KASSERT(sopt != NULL); 1283 1284 level = sopt->sopt_level; 1285 optname = sopt->sopt_name; 1286 1287 error = optval = 0; 1288 uproto = (int)so->so_proto->pr_protocol; 1289 1290 switch (level) { 1291 case IPPROTO_IP: 1292 switch (optname) { 1293 case IP_ADD_MEMBERSHIP: 1294 case IP_DROP_MEMBERSHIP: 1295 case IP_MULTICAST_IF: 1296 case IP_MULTICAST_LOOP: 1297 case IP_MULTICAST_TTL: 1298 mopts = &in6p->in6p_v4moptions; 1299 switch (op) { 1300 case PRCO_GETOPT: 1301 return ip_getmoptions(*mopts, sopt); 1302 case PRCO_SETOPT: 1303 return ip_setmoptions(mopts, sopt); 1304 default: 1305 return EINVAL; 1306 } 1307 default: 1308 return ENOPROTOOPT; 1309 } 1310 case IPPROTO_IPV6: 1311 break; 1312 default: 1313 return ENOPROTOOPT; 1314 } 1315 switch (op) { 1316 case PRCO_SETOPT: 1317 switch (optname) { 1318 #ifdef RFC2292 1319 case IPV6_2292PKTOPTIONS: 1320 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1321 break; 1322 #endif 1323 1324 /* 1325 * Use of some Hop-by-Hop options or some 1326 * Destination options, might require special 1327 * privilege. That is, normal applications 1328 * (without special privilege) might be forbidden 1329 * from setting certain options in outgoing packets, 1330 * and might never see certain options in received 1331 * packets. [RFC 2292 Section 6] 1332 * KAME specific note: 1333 * KAME prevents non-privileged users from sending or 1334 * receiving ANY hbh/dst options in order to avoid 1335 * overhead of parsing options in the kernel. 1336 */ 1337 case IPV6_RECVHOPOPTS: 1338 case IPV6_RECVDSTOPTS: 1339 case IPV6_RECVRTHDRDSTOPTS: 1340 error = kauth_authorize_network(kauth_cred_get(), 1341 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1342 NULL, NULL, NULL); 1343 if (error) 1344 break; 1345 /* FALLTHROUGH */ 1346 case IPV6_UNICAST_HOPS: 1347 case IPV6_HOPLIMIT: 1348 case IPV6_FAITH: 1349 1350 case IPV6_RECVPKTINFO: 1351 case IPV6_RECVHOPLIMIT: 1352 case IPV6_RECVRTHDR: 1353 case IPV6_RECVPATHMTU: 1354 case IPV6_RECVTCLASS: 1355 case IPV6_V6ONLY: 1356 error = sockopt_getint(sopt, &optval); 1357 if (error) 1358 break; 1359 switch (optname) { 1360 case IPV6_UNICAST_HOPS: 1361 if (optval < -1 || optval >= 256) 1362 error = EINVAL; 1363 else { 1364 /* -1 = kernel default */ 1365 in6p->in6p_hops = optval; 1366 } 1367 break; 1368 #define OPTSET(bit) \ 1369 do { \ 1370 if (optval) \ 1371 in6p->in6p_flags |= (bit); \ 1372 else \ 1373 in6p->in6p_flags &= ~(bit); \ 1374 } while (/*CONSTCOND*/ 0) 1375 1376 #ifdef RFC2292 1377 #define OPTSET2292(bit) \ 1378 do { \ 1379 in6p->in6p_flags |= IN6P_RFC2292; \ 1380 if (optval) \ 1381 in6p->in6p_flags |= (bit); \ 1382 else \ 1383 in6p->in6p_flags &= ~(bit); \ 1384 } while (/*CONSTCOND*/ 0) 1385 #endif 1386 1387 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1388 1389 case IPV6_RECVPKTINFO: 1390 #ifdef RFC2292 1391 /* cannot mix with RFC2292 */ 1392 if (OPTBIT(IN6P_RFC2292)) { 1393 error = EINVAL; 1394 break; 1395 } 1396 #endif 1397 OPTSET(IN6P_PKTINFO); 1398 break; 1399 1400 case IPV6_HOPLIMIT: 1401 { 1402 struct ip6_pktopts **optp; 1403 1404 #ifdef RFC2292 1405 /* cannot mix with RFC2292 */ 1406 if (OPTBIT(IN6P_RFC2292)) { 1407 error = EINVAL; 1408 break; 1409 } 1410 #endif 1411 optp = &in6p->in6p_outputopts; 1412 error = ip6_pcbopt(IPV6_HOPLIMIT, 1413 (u_char *)&optval, 1414 sizeof(optval), 1415 optp, 1416 kauth_cred_get(), uproto); 1417 break; 1418 } 1419 1420 case IPV6_RECVHOPLIMIT: 1421 #ifdef RFC2292 1422 /* cannot mix with RFC2292 */ 1423 if (OPTBIT(IN6P_RFC2292)) { 1424 error = EINVAL; 1425 break; 1426 } 1427 #endif 1428 OPTSET(IN6P_HOPLIMIT); 1429 break; 1430 1431 case IPV6_RECVHOPOPTS: 1432 #ifdef RFC2292 1433 /* cannot mix with RFC2292 */ 1434 if (OPTBIT(IN6P_RFC2292)) { 1435 error = EINVAL; 1436 break; 1437 } 1438 #endif 1439 OPTSET(IN6P_HOPOPTS); 1440 break; 1441 1442 case IPV6_RECVDSTOPTS: 1443 #ifdef RFC2292 1444 /* cannot mix with RFC2292 */ 1445 if (OPTBIT(IN6P_RFC2292)) { 1446 error = EINVAL; 1447 break; 1448 } 1449 #endif 1450 OPTSET(IN6P_DSTOPTS); 1451 break; 1452 1453 case IPV6_RECVRTHDRDSTOPTS: 1454 #ifdef RFC2292 1455 /* cannot mix with RFC2292 */ 1456 if (OPTBIT(IN6P_RFC2292)) { 1457 error = EINVAL; 1458 break; 1459 } 1460 #endif 1461 OPTSET(IN6P_RTHDRDSTOPTS); 1462 break; 1463 1464 case IPV6_RECVRTHDR: 1465 #ifdef RFC2292 1466 /* cannot mix with RFC2292 */ 1467 if (OPTBIT(IN6P_RFC2292)) { 1468 error = EINVAL; 1469 break; 1470 } 1471 #endif 1472 OPTSET(IN6P_RTHDR); 1473 break; 1474 1475 case IPV6_FAITH: 1476 OPTSET(IN6P_FAITH); 1477 break; 1478 1479 case IPV6_RECVPATHMTU: 1480 /* 1481 * We ignore this option for TCP 1482 * sockets. 1483 * (RFC3542 leaves this case 1484 * unspecified.) 1485 */ 1486 if (uproto != IPPROTO_TCP) 1487 OPTSET(IN6P_MTU); 1488 break; 1489 1490 case IPV6_V6ONLY: 1491 /* 1492 * make setsockopt(IPV6_V6ONLY) 1493 * available only prior to bind(2). 1494 * see ipng mailing list, Jun 22 2001. 1495 */ 1496 if (in6p->in6p_lport || 1497 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1498 error = EINVAL; 1499 break; 1500 } 1501 #ifdef INET6_BINDV6ONLY 1502 if (!optval) 1503 error = EINVAL; 1504 #else 1505 OPTSET(IN6P_IPV6_V6ONLY); 1506 #endif 1507 break; 1508 case IPV6_RECVTCLASS: 1509 #ifdef RFC2292 1510 /* cannot mix with RFC2292 XXX */ 1511 if (OPTBIT(IN6P_RFC2292)) { 1512 error = EINVAL; 1513 break; 1514 } 1515 #endif 1516 OPTSET(IN6P_TCLASS); 1517 break; 1518 1519 } 1520 break; 1521 1522 case IPV6_OTCLASS: 1523 { 1524 struct ip6_pktopts **optp; 1525 u_int8_t tclass; 1526 1527 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1528 if (error) 1529 break; 1530 optp = &in6p->in6p_outputopts; 1531 error = ip6_pcbopt(optname, 1532 (u_char *)&tclass, 1533 sizeof(tclass), 1534 optp, 1535 kauth_cred_get(), uproto); 1536 break; 1537 } 1538 1539 case IPV6_TCLASS: 1540 case IPV6_DONTFRAG: 1541 case IPV6_USE_MIN_MTU: 1542 case IPV6_PREFER_TEMPADDR: 1543 error = sockopt_getint(sopt, &optval); 1544 if (error) 1545 break; 1546 { 1547 struct ip6_pktopts **optp; 1548 optp = &in6p->in6p_outputopts; 1549 error = ip6_pcbopt(optname, 1550 (u_char *)&optval, 1551 sizeof(optval), 1552 optp, 1553 kauth_cred_get(), uproto); 1554 break; 1555 } 1556 1557 #ifdef RFC2292 1558 case IPV6_2292PKTINFO: 1559 case IPV6_2292HOPLIMIT: 1560 case IPV6_2292HOPOPTS: 1561 case IPV6_2292DSTOPTS: 1562 case IPV6_2292RTHDR: 1563 /* RFC 2292 */ 1564 error = sockopt_getint(sopt, &optval); 1565 if (error) 1566 break; 1567 1568 switch (optname) { 1569 case IPV6_2292PKTINFO: 1570 OPTSET2292(IN6P_PKTINFO); 1571 break; 1572 case IPV6_2292HOPLIMIT: 1573 OPTSET2292(IN6P_HOPLIMIT); 1574 break; 1575 case IPV6_2292HOPOPTS: 1576 /* 1577 * Check super-user privilege. 1578 * See comments for IPV6_RECVHOPOPTS. 1579 */ 1580 error = 1581 kauth_authorize_network(kauth_cred_get(), 1582 KAUTH_NETWORK_IPV6, 1583 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1584 NULL, NULL); 1585 if (error) 1586 return (error); 1587 OPTSET2292(IN6P_HOPOPTS); 1588 break; 1589 case IPV6_2292DSTOPTS: 1590 error = 1591 kauth_authorize_network(kauth_cred_get(), 1592 KAUTH_NETWORK_IPV6, 1593 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1594 NULL, NULL); 1595 if (error) 1596 return (error); 1597 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1598 break; 1599 case IPV6_2292RTHDR: 1600 OPTSET2292(IN6P_RTHDR); 1601 break; 1602 } 1603 break; 1604 #endif 1605 case IPV6_PKTINFO: 1606 case IPV6_HOPOPTS: 1607 case IPV6_RTHDR: 1608 case IPV6_DSTOPTS: 1609 case IPV6_RTHDRDSTOPTS: 1610 case IPV6_NEXTHOP: { 1611 /* new advanced API (RFC3542) */ 1612 void *optbuf; 1613 int optbuflen; 1614 struct ip6_pktopts **optp; 1615 1616 #ifdef RFC2292 1617 /* cannot mix with RFC2292 */ 1618 if (OPTBIT(IN6P_RFC2292)) { 1619 error = EINVAL; 1620 break; 1621 } 1622 #endif 1623 1624 optbuflen = sopt->sopt_size; 1625 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1626 if (optbuf == NULL) { 1627 error = ENOBUFS; 1628 break; 1629 } 1630 1631 error = sockopt_get(sopt, optbuf, optbuflen); 1632 if (error) { 1633 free(optbuf, M_IP6OPT); 1634 break; 1635 } 1636 optp = &in6p->in6p_outputopts; 1637 error = ip6_pcbopt(optname, optbuf, optbuflen, 1638 optp, kauth_cred_get(), uproto); 1639 1640 free(optbuf, M_IP6OPT); 1641 break; 1642 } 1643 #undef OPTSET 1644 1645 case IPV6_MULTICAST_IF: 1646 case IPV6_MULTICAST_HOPS: 1647 case IPV6_MULTICAST_LOOP: 1648 case IPV6_JOIN_GROUP: 1649 case IPV6_LEAVE_GROUP: 1650 error = ip6_setmoptions(sopt, in6p); 1651 break; 1652 1653 case IPV6_PORTRANGE: 1654 error = sockopt_getint(sopt, &optval); 1655 if (error) 1656 break; 1657 1658 switch (optval) { 1659 case IPV6_PORTRANGE_DEFAULT: 1660 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1661 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1662 break; 1663 1664 case IPV6_PORTRANGE_HIGH: 1665 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1666 in6p->in6p_flags |= IN6P_HIGHPORT; 1667 break; 1668 1669 case IPV6_PORTRANGE_LOW: 1670 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1671 in6p->in6p_flags |= IN6P_LOWPORT; 1672 break; 1673 1674 default: 1675 error = EINVAL; 1676 break; 1677 } 1678 break; 1679 1680 case IPV6_PORTALGO: 1681 error = sockopt_getint(sopt, &optval); 1682 if (error) 1683 break; 1684 1685 error = portalgo_algo_index_select( 1686 (struct inpcb_hdr *)in6p, optval); 1687 break; 1688 1689 #if defined(IPSEC) 1690 case IPV6_IPSEC_POLICY: 1691 if (ipsec_enabled) { 1692 error = ipsec6_set_policy(in6p, optname, 1693 sopt->sopt_data, sopt->sopt_size, 1694 kauth_cred_get()); 1695 break; 1696 } 1697 /*FALLTHROUGH*/ 1698 #endif /* IPSEC */ 1699 1700 default: 1701 error = ENOPROTOOPT; 1702 break; 1703 } 1704 break; 1705 1706 case PRCO_GETOPT: 1707 switch (optname) { 1708 #ifdef RFC2292 1709 case IPV6_2292PKTOPTIONS: 1710 /* 1711 * RFC3542 (effectively) deprecated the 1712 * semantics of the 2292-style pktoptions. 1713 * Since it was not reliable in nature (i.e., 1714 * applications had to expect the lack of some 1715 * information after all), it would make sense 1716 * to simplify this part by always returning 1717 * empty data. 1718 */ 1719 break; 1720 #endif 1721 1722 case IPV6_RECVHOPOPTS: 1723 case IPV6_RECVDSTOPTS: 1724 case IPV6_RECVRTHDRDSTOPTS: 1725 case IPV6_UNICAST_HOPS: 1726 case IPV6_RECVPKTINFO: 1727 case IPV6_RECVHOPLIMIT: 1728 case IPV6_RECVRTHDR: 1729 case IPV6_RECVPATHMTU: 1730 1731 case IPV6_FAITH: 1732 case IPV6_V6ONLY: 1733 case IPV6_PORTRANGE: 1734 case IPV6_RECVTCLASS: 1735 switch (optname) { 1736 1737 case IPV6_RECVHOPOPTS: 1738 optval = OPTBIT(IN6P_HOPOPTS); 1739 break; 1740 1741 case IPV6_RECVDSTOPTS: 1742 optval = OPTBIT(IN6P_DSTOPTS); 1743 break; 1744 1745 case IPV6_RECVRTHDRDSTOPTS: 1746 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1747 break; 1748 1749 case IPV6_UNICAST_HOPS: 1750 optval = in6p->in6p_hops; 1751 break; 1752 1753 case IPV6_RECVPKTINFO: 1754 optval = OPTBIT(IN6P_PKTINFO); 1755 break; 1756 1757 case IPV6_RECVHOPLIMIT: 1758 optval = OPTBIT(IN6P_HOPLIMIT); 1759 break; 1760 1761 case IPV6_RECVRTHDR: 1762 optval = OPTBIT(IN6P_RTHDR); 1763 break; 1764 1765 case IPV6_RECVPATHMTU: 1766 optval = OPTBIT(IN6P_MTU); 1767 break; 1768 1769 case IPV6_FAITH: 1770 optval = OPTBIT(IN6P_FAITH); 1771 break; 1772 1773 case IPV6_V6ONLY: 1774 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1775 break; 1776 1777 case IPV6_PORTRANGE: 1778 { 1779 int flags; 1780 flags = in6p->in6p_flags; 1781 if (flags & IN6P_HIGHPORT) 1782 optval = IPV6_PORTRANGE_HIGH; 1783 else if (flags & IN6P_LOWPORT) 1784 optval = IPV6_PORTRANGE_LOW; 1785 else 1786 optval = 0; 1787 break; 1788 } 1789 case IPV6_RECVTCLASS: 1790 optval = OPTBIT(IN6P_TCLASS); 1791 break; 1792 1793 } 1794 if (error) 1795 break; 1796 error = sockopt_setint(sopt, optval); 1797 break; 1798 1799 case IPV6_PATHMTU: 1800 { 1801 u_long pmtu = 0; 1802 struct ip6_mtuinfo mtuinfo; 1803 struct route *ro = &in6p->in6p_route; 1804 1805 if (!(so->so_state & SS_ISCONNECTED)) 1806 return (ENOTCONN); 1807 /* 1808 * XXX: we dot not consider the case of source 1809 * routing, or optional information to specify 1810 * the outgoing interface. 1811 */ 1812 error = ip6_getpmtu(ro, NULL, NULL, 1813 &in6p->in6p_faddr, &pmtu, NULL); 1814 if (error) 1815 break; 1816 if (pmtu > IPV6_MAXPACKET) 1817 pmtu = IPV6_MAXPACKET; 1818 1819 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1820 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1821 optdata = (void *)&mtuinfo; 1822 optdatalen = sizeof(mtuinfo); 1823 if (optdatalen > MCLBYTES) 1824 return (EMSGSIZE); /* XXX */ 1825 error = sockopt_set(sopt, optdata, optdatalen); 1826 break; 1827 } 1828 1829 #ifdef RFC2292 1830 case IPV6_2292PKTINFO: 1831 case IPV6_2292HOPLIMIT: 1832 case IPV6_2292HOPOPTS: 1833 case IPV6_2292RTHDR: 1834 case IPV6_2292DSTOPTS: 1835 switch (optname) { 1836 case IPV6_2292PKTINFO: 1837 optval = OPTBIT(IN6P_PKTINFO); 1838 break; 1839 case IPV6_2292HOPLIMIT: 1840 optval = OPTBIT(IN6P_HOPLIMIT); 1841 break; 1842 case IPV6_2292HOPOPTS: 1843 optval = OPTBIT(IN6P_HOPOPTS); 1844 break; 1845 case IPV6_2292RTHDR: 1846 optval = OPTBIT(IN6P_RTHDR); 1847 break; 1848 case IPV6_2292DSTOPTS: 1849 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1850 break; 1851 } 1852 error = sockopt_setint(sopt, optval); 1853 break; 1854 #endif 1855 case IPV6_PKTINFO: 1856 case IPV6_HOPOPTS: 1857 case IPV6_RTHDR: 1858 case IPV6_DSTOPTS: 1859 case IPV6_RTHDRDSTOPTS: 1860 case IPV6_NEXTHOP: 1861 case IPV6_OTCLASS: 1862 case IPV6_TCLASS: 1863 case IPV6_DONTFRAG: 1864 case IPV6_USE_MIN_MTU: 1865 case IPV6_PREFER_TEMPADDR: 1866 error = ip6_getpcbopt(in6p->in6p_outputopts, 1867 optname, sopt); 1868 break; 1869 1870 case IPV6_MULTICAST_IF: 1871 case IPV6_MULTICAST_HOPS: 1872 case IPV6_MULTICAST_LOOP: 1873 case IPV6_JOIN_GROUP: 1874 case IPV6_LEAVE_GROUP: 1875 error = ip6_getmoptions(sopt, in6p); 1876 break; 1877 1878 case IPV6_PORTALGO: 1879 optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; 1880 error = sockopt_setint(sopt, optval); 1881 break; 1882 1883 #if defined(IPSEC) 1884 case IPV6_IPSEC_POLICY: 1885 if (ipsec_used) { 1886 struct mbuf *m = NULL; 1887 1888 /* 1889 * XXX: this will return EINVAL as sopt is 1890 * empty 1891 */ 1892 error = ipsec6_get_policy(in6p, sopt->sopt_data, 1893 sopt->sopt_size, &m); 1894 if (!error) 1895 error = sockopt_setmbuf(sopt, m); 1896 break; 1897 } 1898 /*FALLTHROUGH*/ 1899 #endif /* IPSEC */ 1900 1901 default: 1902 error = ENOPROTOOPT; 1903 break; 1904 } 1905 break; 1906 } 1907 return (error); 1908 } 1909 1910 int 1911 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1912 { 1913 int error = 0, optval; 1914 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1915 struct in6pcb *in6p = sotoin6pcb(so); 1916 int level, optname; 1917 1918 KASSERT(sopt != NULL); 1919 1920 level = sopt->sopt_level; 1921 optname = sopt->sopt_name; 1922 1923 if (level != IPPROTO_IPV6) { 1924 return ENOPROTOOPT; 1925 } 1926 1927 switch (optname) { 1928 case IPV6_CHECKSUM: 1929 /* 1930 * For ICMPv6 sockets, no modification allowed for checksum 1931 * offset, permit "no change" values to help existing apps. 1932 * 1933 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 1934 * for an ICMPv6 socket will fail." The current 1935 * behavior does not meet RFC3542. 1936 */ 1937 switch (op) { 1938 case PRCO_SETOPT: 1939 error = sockopt_getint(sopt, &optval); 1940 if (error) 1941 break; 1942 if ((optval % 2) != 0) { 1943 /* the API assumes even offset values */ 1944 error = EINVAL; 1945 } else if (so->so_proto->pr_protocol == 1946 IPPROTO_ICMPV6) { 1947 if (optval != icmp6off) 1948 error = EINVAL; 1949 } else 1950 in6p->in6p_cksum = optval; 1951 break; 1952 1953 case PRCO_GETOPT: 1954 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1955 optval = icmp6off; 1956 else 1957 optval = in6p->in6p_cksum; 1958 1959 error = sockopt_setint(sopt, optval); 1960 break; 1961 1962 default: 1963 error = EINVAL; 1964 break; 1965 } 1966 break; 1967 1968 default: 1969 error = ENOPROTOOPT; 1970 break; 1971 } 1972 1973 return (error); 1974 } 1975 1976 #ifdef RFC2292 1977 /* 1978 * Set up IP6 options in pcb for insertion in output packets or 1979 * specifying behavior of outgoing packets. 1980 */ 1981 static int 1982 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 1983 struct sockopt *sopt) 1984 { 1985 struct ip6_pktopts *opt = *pktopt; 1986 struct mbuf *m; 1987 int error = 0; 1988 1989 /* turn off any old options. */ 1990 if (opt) { 1991 #ifdef DIAGNOSTIC 1992 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1993 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1994 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1995 printf("ip6_pcbopts: all specified options are cleared.\n"); 1996 #endif 1997 ip6_clearpktopts(opt, -1); 1998 } else { 1999 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2000 if (opt == NULL) 2001 return (ENOBUFS); 2002 } 2003 *pktopt = NULL; 2004 2005 if (sopt == NULL || sopt->sopt_size == 0) { 2006 /* 2007 * Only turning off any previous options, regardless of 2008 * whether the opt is just created or given. 2009 */ 2010 free(opt, M_IP6OPT); 2011 return (0); 2012 } 2013 2014 /* set options specified by user. */ 2015 m = sockopt_getmbuf(sopt); 2016 if (m == NULL) { 2017 free(opt, M_IP6OPT); 2018 return (ENOBUFS); 2019 } 2020 2021 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2022 so->so_proto->pr_protocol); 2023 m_freem(m); 2024 if (error != 0) { 2025 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2026 free(opt, M_IP6OPT); 2027 return (error); 2028 } 2029 *pktopt = opt; 2030 return (0); 2031 } 2032 #endif 2033 2034 /* 2035 * initialize ip6_pktopts. beware that there are non-zero default values in 2036 * the struct. 2037 */ 2038 void 2039 ip6_initpktopts(struct ip6_pktopts *opt) 2040 { 2041 2042 memset(opt, 0, sizeof(*opt)); 2043 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2044 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2045 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2046 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2047 } 2048 2049 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2050 static int 2051 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2052 kauth_cred_t cred, int uproto) 2053 { 2054 struct ip6_pktopts *opt; 2055 2056 if (*pktopt == NULL) { 2057 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2058 M_NOWAIT); 2059 if (*pktopt == NULL) 2060 return (ENOBUFS); 2061 2062 ip6_initpktopts(*pktopt); 2063 } 2064 opt = *pktopt; 2065 2066 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2067 } 2068 2069 static int 2070 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2071 { 2072 void *optdata = NULL; 2073 int optdatalen = 0; 2074 struct ip6_ext *ip6e; 2075 int error = 0; 2076 struct in6_pktinfo null_pktinfo; 2077 int deftclass = 0, on; 2078 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2079 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2080 2081 switch (optname) { 2082 case IPV6_PKTINFO: 2083 if (pktopt && pktopt->ip6po_pktinfo) 2084 optdata = (void *)pktopt->ip6po_pktinfo; 2085 else { 2086 /* XXX: we don't have to do this every time... */ 2087 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2088 optdata = (void *)&null_pktinfo; 2089 } 2090 optdatalen = sizeof(struct in6_pktinfo); 2091 break; 2092 case IPV6_OTCLASS: 2093 /* XXX */ 2094 return (EINVAL); 2095 case IPV6_TCLASS: 2096 if (pktopt && pktopt->ip6po_tclass >= 0) 2097 optdata = (void *)&pktopt->ip6po_tclass; 2098 else 2099 optdata = (void *)&deftclass; 2100 optdatalen = sizeof(int); 2101 break; 2102 case IPV6_HOPOPTS: 2103 if (pktopt && pktopt->ip6po_hbh) { 2104 optdata = (void *)pktopt->ip6po_hbh; 2105 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2106 optdatalen = (ip6e->ip6e_len + 1) << 3; 2107 } 2108 break; 2109 case IPV6_RTHDR: 2110 if (pktopt && pktopt->ip6po_rthdr) { 2111 optdata = (void *)pktopt->ip6po_rthdr; 2112 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2113 optdatalen = (ip6e->ip6e_len + 1) << 3; 2114 } 2115 break; 2116 case IPV6_RTHDRDSTOPTS: 2117 if (pktopt && pktopt->ip6po_dest1) { 2118 optdata = (void *)pktopt->ip6po_dest1; 2119 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2120 optdatalen = (ip6e->ip6e_len + 1) << 3; 2121 } 2122 break; 2123 case IPV6_DSTOPTS: 2124 if (pktopt && pktopt->ip6po_dest2) { 2125 optdata = (void *)pktopt->ip6po_dest2; 2126 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2127 optdatalen = (ip6e->ip6e_len + 1) << 3; 2128 } 2129 break; 2130 case IPV6_NEXTHOP: 2131 if (pktopt && pktopt->ip6po_nexthop) { 2132 optdata = (void *)pktopt->ip6po_nexthop; 2133 optdatalen = pktopt->ip6po_nexthop->sa_len; 2134 } 2135 break; 2136 case IPV6_USE_MIN_MTU: 2137 if (pktopt) 2138 optdata = (void *)&pktopt->ip6po_minmtu; 2139 else 2140 optdata = (void *)&defminmtu; 2141 optdatalen = sizeof(int); 2142 break; 2143 case IPV6_DONTFRAG: 2144 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2145 on = 1; 2146 else 2147 on = 0; 2148 optdata = (void *)&on; 2149 optdatalen = sizeof(on); 2150 break; 2151 case IPV6_PREFER_TEMPADDR: 2152 if (pktopt) 2153 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2154 else 2155 optdata = (void *)&defpreftemp; 2156 optdatalen = sizeof(int); 2157 break; 2158 default: /* should not happen */ 2159 #ifdef DIAGNOSTIC 2160 panic("ip6_getpcbopt: unexpected option\n"); 2161 #endif 2162 return (ENOPROTOOPT); 2163 } 2164 2165 error = sockopt_set(sopt, optdata, optdatalen); 2166 2167 return (error); 2168 } 2169 2170 void 2171 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2172 { 2173 if (optname == -1 || optname == IPV6_PKTINFO) { 2174 if (pktopt->ip6po_pktinfo) 2175 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2176 pktopt->ip6po_pktinfo = NULL; 2177 } 2178 if (optname == -1 || optname == IPV6_HOPLIMIT) 2179 pktopt->ip6po_hlim = -1; 2180 if (optname == -1 || optname == IPV6_TCLASS) 2181 pktopt->ip6po_tclass = -1; 2182 if (optname == -1 || optname == IPV6_NEXTHOP) { 2183 rtcache_free(&pktopt->ip6po_nextroute); 2184 if (pktopt->ip6po_nexthop) 2185 free(pktopt->ip6po_nexthop, M_IP6OPT); 2186 pktopt->ip6po_nexthop = NULL; 2187 } 2188 if (optname == -1 || optname == IPV6_HOPOPTS) { 2189 if (pktopt->ip6po_hbh) 2190 free(pktopt->ip6po_hbh, M_IP6OPT); 2191 pktopt->ip6po_hbh = NULL; 2192 } 2193 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2194 if (pktopt->ip6po_dest1) 2195 free(pktopt->ip6po_dest1, M_IP6OPT); 2196 pktopt->ip6po_dest1 = NULL; 2197 } 2198 if (optname == -1 || optname == IPV6_RTHDR) { 2199 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2200 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2201 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2202 rtcache_free(&pktopt->ip6po_route); 2203 } 2204 if (optname == -1 || optname == IPV6_DSTOPTS) { 2205 if (pktopt->ip6po_dest2) 2206 free(pktopt->ip6po_dest2, M_IP6OPT); 2207 pktopt->ip6po_dest2 = NULL; 2208 } 2209 } 2210 2211 #define PKTOPT_EXTHDRCPY(type) \ 2212 do { \ 2213 if (src->type) { \ 2214 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2215 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2216 if (dst->type == NULL) \ 2217 goto bad; \ 2218 memcpy(dst->type, src->type, hlen); \ 2219 } \ 2220 } while (/*CONSTCOND*/ 0) 2221 2222 static int 2223 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2224 { 2225 dst->ip6po_hlim = src->ip6po_hlim; 2226 dst->ip6po_tclass = src->ip6po_tclass; 2227 dst->ip6po_flags = src->ip6po_flags; 2228 dst->ip6po_minmtu = src->ip6po_minmtu; 2229 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2230 if (src->ip6po_pktinfo) { 2231 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2232 M_IP6OPT, canwait); 2233 if (dst->ip6po_pktinfo == NULL) 2234 goto bad; 2235 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2236 } 2237 if (src->ip6po_nexthop) { 2238 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2239 M_IP6OPT, canwait); 2240 if (dst->ip6po_nexthop == NULL) 2241 goto bad; 2242 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2243 src->ip6po_nexthop->sa_len); 2244 } 2245 PKTOPT_EXTHDRCPY(ip6po_hbh); 2246 PKTOPT_EXTHDRCPY(ip6po_dest1); 2247 PKTOPT_EXTHDRCPY(ip6po_dest2); 2248 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2249 return (0); 2250 2251 bad: 2252 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2253 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2254 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2255 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2256 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2257 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2258 2259 return (ENOBUFS); 2260 } 2261 #undef PKTOPT_EXTHDRCPY 2262 2263 struct ip6_pktopts * 2264 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2265 { 2266 int error; 2267 struct ip6_pktopts *dst; 2268 2269 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2270 if (dst == NULL) 2271 return (NULL); 2272 ip6_initpktopts(dst); 2273 2274 if ((error = copypktopts(dst, src, canwait)) != 0) { 2275 free(dst, M_IP6OPT); 2276 return (NULL); 2277 } 2278 2279 return (dst); 2280 } 2281 2282 void 2283 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2284 { 2285 if (pktopt == NULL) 2286 return; 2287 2288 ip6_clearpktopts(pktopt, -1); 2289 2290 free(pktopt, M_IP6OPT); 2291 } 2292 2293 int 2294 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, void *v, 2295 size_t l) 2296 { 2297 struct ipv6_mreq mreq; 2298 int error; 2299 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2300 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2301 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2302 if (error != 0) 2303 return error; 2304 2305 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2306 /* 2307 * We use the unspecified address to specify to accept 2308 * all multicast addresses. Only super user is allowed 2309 * to do this. 2310 */ 2311 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, 2312 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2313 return EACCES; 2314 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2315 // Don't bother if we are not going to use ifp. 2316 if (l == sizeof(*ia)) { 2317 memcpy(v, ia, l); 2318 return 0; 2319 } 2320 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2321 return EINVAL; 2322 } 2323 2324 /* 2325 * If no interface was explicitly specified, choose an 2326 * appropriate one according to the given multicast address. 2327 */ 2328 if (mreq.ipv6mr_interface == 0) { 2329 struct rtentry *rt; 2330 union { 2331 struct sockaddr dst; 2332 struct sockaddr_in dst4; 2333 struct sockaddr_in6 dst6; 2334 } u; 2335 struct route ro; 2336 2337 /* 2338 * Look up the routing table for the 2339 * address, and choose the outgoing interface. 2340 * XXX: is it a good approach? 2341 */ 2342 memset(&ro, 0, sizeof(ro)); 2343 if (IN6_IS_ADDR_V4MAPPED(ia)) 2344 sockaddr_in_init(&u.dst4, ia4, 0); 2345 else 2346 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2347 error = rtcache_setdst(&ro, &u.dst); 2348 if (error != 0) 2349 return error; 2350 *ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp : NULL; 2351 rtcache_free(&ro); 2352 } else { 2353 /* 2354 * If the interface is specified, validate it. 2355 */ 2356 if ((*ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) 2357 return ENXIO; /* XXX EINVAL? */ 2358 } 2359 if (sizeof(*ia) == l) 2360 memcpy(v, ia, l); 2361 else 2362 memcpy(v, ia4, l); 2363 return 0; 2364 } 2365 2366 /* 2367 * Set the IP6 multicast options in response to user setsockopt(). 2368 */ 2369 static int 2370 ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) 2371 { 2372 int error = 0; 2373 u_int loop, ifindex; 2374 struct ipv6_mreq mreq; 2375 struct in6_addr ia; 2376 struct ifnet *ifp; 2377 struct ip6_moptions *im6o = in6p->in6p_moptions; 2378 struct in6_multi_mship *imm; 2379 2380 if (im6o == NULL) { 2381 /* 2382 * No multicast option buffer attached to the pcb; 2383 * allocate one and initialize to default values. 2384 */ 2385 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2386 if (im6o == NULL) 2387 return (ENOBUFS); 2388 in6p->in6p_moptions = im6o; 2389 im6o->im6o_multicast_if_index = 0; 2390 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2391 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2392 LIST_INIT(&im6o->im6o_memberships); 2393 } 2394 2395 switch (sopt->sopt_name) { 2396 2397 case IPV6_MULTICAST_IF: 2398 /* 2399 * Select the interface for outgoing multicast packets. 2400 */ 2401 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2402 if (error != 0) 2403 break; 2404 2405 if (ifindex != 0) { 2406 if ((ifp = if_byindex(ifindex)) == NULL) { 2407 error = ENXIO; /* XXX EINVAL? */ 2408 break; 2409 } 2410 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2411 error = EADDRNOTAVAIL; 2412 break; 2413 } 2414 } else 2415 ifp = NULL; 2416 im6o->im6o_multicast_if_index = if_get_index(ifp); 2417 break; 2418 2419 case IPV6_MULTICAST_HOPS: 2420 { 2421 /* 2422 * Set the IP6 hoplimit for outgoing multicast packets. 2423 */ 2424 int optval; 2425 2426 error = sockopt_getint(sopt, &optval); 2427 if (error != 0) 2428 break; 2429 2430 if (optval < -1 || optval >= 256) 2431 error = EINVAL; 2432 else if (optval == -1) 2433 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2434 else 2435 im6o->im6o_multicast_hlim = optval; 2436 break; 2437 } 2438 2439 case IPV6_MULTICAST_LOOP: 2440 /* 2441 * Set the loopback flag for outgoing multicast packets. 2442 * Must be zero or one. 2443 */ 2444 error = sockopt_get(sopt, &loop, sizeof(loop)); 2445 if (error != 0) 2446 break; 2447 if (loop > 1) { 2448 error = EINVAL; 2449 break; 2450 } 2451 im6o->im6o_multicast_loop = loop; 2452 break; 2453 2454 case IPV6_JOIN_GROUP: 2455 /* 2456 * Add a multicast group membership. 2457 * Group must be a valid IP6 multicast address. 2458 */ 2459 if ((error = ip6_get_membership(sopt, &ifp, &ia, sizeof(ia)))) 2460 return error; 2461 2462 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2463 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2464 break; 2465 } 2466 /* 2467 * See if we found an interface, and confirm that it 2468 * supports multicast 2469 */ 2470 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2471 error = EADDRNOTAVAIL; 2472 break; 2473 } 2474 2475 if (in6_setscope(&ia, ifp, NULL)) { 2476 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2477 break; 2478 } 2479 2480 /* 2481 * See if the membership already exists. 2482 */ 2483 for (imm = im6o->im6o_memberships.lh_first; 2484 imm != NULL; imm = imm->i6mm_chain.le_next) 2485 if (imm->i6mm_maddr->in6m_ifp == ifp && 2486 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2487 &ia)) 2488 break; 2489 if (imm != NULL) { 2490 error = EADDRINUSE; 2491 break; 2492 } 2493 /* 2494 * Everything looks good; add a new record to the multicast 2495 * address list for the given interface. 2496 */ 2497 imm = in6_joingroup(ifp, &ia, &error, 0); 2498 if (imm == NULL) 2499 break; 2500 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2501 break; 2502 2503 case IPV6_LEAVE_GROUP: 2504 /* 2505 * Drop a multicast group membership. 2506 * Group must be a valid IP6 multicast address. 2507 */ 2508 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2509 if (error != 0) 2510 break; 2511 2512 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2513 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2514 break; 2515 } 2516 /* 2517 * If an interface address was specified, get a pointer 2518 * to its ifnet structure. 2519 */ 2520 if (mreq.ipv6mr_interface != 0) { 2521 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2522 error = ENXIO; /* XXX EINVAL? */ 2523 break; 2524 } 2525 } else 2526 ifp = NULL; 2527 2528 /* Fill in the scope zone ID */ 2529 if (ifp) { 2530 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2531 /* XXX: should not happen */ 2532 error = EADDRNOTAVAIL; 2533 break; 2534 } 2535 } else if (mreq.ipv6mr_interface != 0) { 2536 /* 2537 * XXX: This case would happens when the (positive) 2538 * index is in the valid range, but the corresponding 2539 * interface has been detached dynamically. The above 2540 * check probably avoids such case to happen here, but 2541 * we check it explicitly for safety. 2542 */ 2543 error = EADDRNOTAVAIL; 2544 break; 2545 } else { /* ipv6mr_interface == 0 */ 2546 struct sockaddr_in6 sa6_mc; 2547 2548 /* 2549 * The API spec says as follows: 2550 * If the interface index is specified as 0, the 2551 * system may choose a multicast group membership to 2552 * drop by matching the multicast address only. 2553 * On the other hand, we cannot disambiguate the scope 2554 * zone unless an interface is provided. Thus, we 2555 * check if there's ambiguity with the default scope 2556 * zone as the last resort. 2557 */ 2558 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2559 0, 0, 0); 2560 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2561 if (error != 0) 2562 break; 2563 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2564 } 2565 2566 /* 2567 * Find the membership in the membership list. 2568 */ 2569 for (imm = im6o->im6o_memberships.lh_first; 2570 imm != NULL; imm = imm->i6mm_chain.le_next) { 2571 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2572 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2573 &mreq.ipv6mr_multiaddr)) 2574 break; 2575 } 2576 if (imm == NULL) { 2577 /* Unable to resolve interface */ 2578 error = EADDRNOTAVAIL; 2579 break; 2580 } 2581 /* 2582 * Give up the multicast address record to which the 2583 * membership points. 2584 */ 2585 LIST_REMOVE(imm, i6mm_chain); 2586 in6_leavegroup(imm); 2587 break; 2588 2589 default: 2590 error = EOPNOTSUPP; 2591 break; 2592 } 2593 2594 /* 2595 * If all options have default values, no need to keep the mbuf. 2596 */ 2597 if (im6o->im6o_multicast_if_index == 0 && 2598 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2599 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2600 im6o->im6o_memberships.lh_first == NULL) { 2601 free(in6p->in6p_moptions, M_IPMOPTS); 2602 in6p->in6p_moptions = NULL; 2603 } 2604 2605 return (error); 2606 } 2607 2608 /* 2609 * Return the IP6 multicast options in response to user getsockopt(). 2610 */ 2611 static int 2612 ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p) 2613 { 2614 u_int optval; 2615 int error; 2616 struct ip6_moptions *im6o = in6p->in6p_moptions; 2617 2618 switch (sopt->sopt_name) { 2619 case IPV6_MULTICAST_IF: 2620 if (im6o == NULL || im6o->im6o_multicast_if_index == 0) 2621 optval = 0; 2622 else 2623 optval = im6o->im6o_multicast_if_index; 2624 2625 error = sockopt_set(sopt, &optval, sizeof(optval)); 2626 break; 2627 2628 case IPV6_MULTICAST_HOPS: 2629 if (im6o == NULL) 2630 optval = ip6_defmcasthlim; 2631 else 2632 optval = im6o->im6o_multicast_hlim; 2633 2634 error = sockopt_set(sopt, &optval, sizeof(optval)); 2635 break; 2636 2637 case IPV6_MULTICAST_LOOP: 2638 if (im6o == NULL) 2639 optval = IPV6_DEFAULT_MULTICAST_LOOP; 2640 else 2641 optval = im6o->im6o_multicast_loop; 2642 2643 error = sockopt_set(sopt, &optval, sizeof(optval)); 2644 break; 2645 2646 default: 2647 error = EOPNOTSUPP; 2648 } 2649 2650 return (error); 2651 } 2652 2653 /* 2654 * Discard the IP6 multicast options. 2655 */ 2656 void 2657 ip6_freemoptions(struct ip6_moptions *im6o) 2658 { 2659 struct in6_multi_mship *imm; 2660 2661 if (im6o == NULL) 2662 return; 2663 2664 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2665 LIST_REMOVE(imm, i6mm_chain); 2666 in6_leavegroup(imm); 2667 } 2668 free(im6o, M_IPMOPTS); 2669 } 2670 2671 /* 2672 * Set IPv6 outgoing packet options based on advanced API. 2673 */ 2674 int 2675 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2676 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2677 { 2678 struct cmsghdr *cm = 0; 2679 2680 if (control == NULL || opt == NULL) 2681 return (EINVAL); 2682 2683 ip6_initpktopts(opt); 2684 if (stickyopt) { 2685 int error; 2686 2687 /* 2688 * If stickyopt is provided, make a local copy of the options 2689 * for this particular packet, then override them by ancillary 2690 * objects. 2691 * XXX: copypktopts() does not copy the cached route to a next 2692 * hop (if any). This is not very good in terms of efficiency, 2693 * but we can allow this since this option should be rarely 2694 * used. 2695 */ 2696 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2697 return (error); 2698 } 2699 2700 /* 2701 * XXX: Currently, we assume all the optional information is stored 2702 * in a single mbuf. 2703 */ 2704 if (control->m_next) 2705 return (EINVAL); 2706 2707 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2708 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2709 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2710 int error; 2711 2712 if (control->m_len < CMSG_LEN(0)) 2713 return (EINVAL); 2714 2715 cm = mtod(control, struct cmsghdr *); 2716 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2717 return (EINVAL); 2718 if (cm->cmsg_level != IPPROTO_IPV6) 2719 continue; 2720 2721 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2722 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2723 if (error) 2724 return (error); 2725 } 2726 2727 return (0); 2728 } 2729 2730 /* 2731 * Set a particular packet option, as a sticky option or an ancillary data 2732 * item. "len" can be 0 only when it's a sticky option. 2733 * We have 4 cases of combination of "sticky" and "cmsg": 2734 * "sticky=0, cmsg=0": impossible 2735 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2736 * "sticky=1, cmsg=0": RFC3542 socket option 2737 * "sticky=1, cmsg=1": RFC2292 socket option 2738 */ 2739 static int 2740 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2741 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2742 { 2743 int minmtupolicy; 2744 int error; 2745 2746 if (!sticky && !cmsg) { 2747 #ifdef DIAGNOSTIC 2748 printf("ip6_setpktopt: impossible case\n"); 2749 #endif 2750 return (EINVAL); 2751 } 2752 2753 /* 2754 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2755 * not be specified in the context of RFC3542. Conversely, 2756 * RFC3542 types should not be specified in the context of RFC2292. 2757 */ 2758 if (!cmsg) { 2759 switch (optname) { 2760 case IPV6_2292PKTINFO: 2761 case IPV6_2292HOPLIMIT: 2762 case IPV6_2292NEXTHOP: 2763 case IPV6_2292HOPOPTS: 2764 case IPV6_2292DSTOPTS: 2765 case IPV6_2292RTHDR: 2766 case IPV6_2292PKTOPTIONS: 2767 return (ENOPROTOOPT); 2768 } 2769 } 2770 if (sticky && cmsg) { 2771 switch (optname) { 2772 case IPV6_PKTINFO: 2773 case IPV6_HOPLIMIT: 2774 case IPV6_NEXTHOP: 2775 case IPV6_HOPOPTS: 2776 case IPV6_DSTOPTS: 2777 case IPV6_RTHDRDSTOPTS: 2778 case IPV6_RTHDR: 2779 case IPV6_USE_MIN_MTU: 2780 case IPV6_DONTFRAG: 2781 case IPV6_OTCLASS: 2782 case IPV6_TCLASS: 2783 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2784 return (ENOPROTOOPT); 2785 } 2786 } 2787 2788 switch (optname) { 2789 #ifdef RFC2292 2790 case IPV6_2292PKTINFO: 2791 #endif 2792 case IPV6_PKTINFO: 2793 { 2794 struct in6_pktinfo *pktinfo; 2795 2796 if (len != sizeof(struct in6_pktinfo)) 2797 return (EINVAL); 2798 2799 pktinfo = (struct in6_pktinfo *)buf; 2800 2801 /* 2802 * An application can clear any sticky IPV6_PKTINFO option by 2803 * doing a "regular" setsockopt with ipi6_addr being 2804 * in6addr_any and ipi6_ifindex being zero. 2805 * [RFC 3542, Section 6] 2806 */ 2807 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2808 pktinfo->ipi6_ifindex == 0 && 2809 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2810 ip6_clearpktopts(opt, optname); 2811 break; 2812 } 2813 2814 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2815 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2816 return (EINVAL); 2817 } 2818 2819 /* Validate the interface index if specified. */ 2820 if (pktinfo->ipi6_ifindex) { 2821 struct ifnet *ifp; 2822 int s = pserialize_read_enter(); 2823 ifp = if_byindex(pktinfo->ipi6_ifindex); 2824 if (ifp == NULL) { 2825 pserialize_read_exit(s); 2826 return ENXIO; 2827 } 2828 pserialize_read_exit(s); 2829 } 2830 2831 /* 2832 * We store the address anyway, and let in6_selectsrc() 2833 * validate the specified address. This is because ipi6_addr 2834 * may not have enough information about its scope zone, and 2835 * we may need additional information (such as outgoing 2836 * interface or the scope zone of a destination address) to 2837 * disambiguate the scope. 2838 * XXX: the delay of the validation may confuse the 2839 * application when it is used as a sticky option. 2840 */ 2841 if (opt->ip6po_pktinfo == NULL) { 2842 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2843 M_IP6OPT, M_NOWAIT); 2844 if (opt->ip6po_pktinfo == NULL) 2845 return (ENOBUFS); 2846 } 2847 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2848 break; 2849 } 2850 2851 #ifdef RFC2292 2852 case IPV6_2292HOPLIMIT: 2853 #endif 2854 case IPV6_HOPLIMIT: 2855 { 2856 int *hlimp; 2857 2858 /* 2859 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2860 * to simplify the ordering among hoplimit options. 2861 */ 2862 if (optname == IPV6_HOPLIMIT && sticky) 2863 return (ENOPROTOOPT); 2864 2865 if (len != sizeof(int)) 2866 return (EINVAL); 2867 hlimp = (int *)buf; 2868 if (*hlimp < -1 || *hlimp > 255) 2869 return (EINVAL); 2870 2871 opt->ip6po_hlim = *hlimp; 2872 break; 2873 } 2874 2875 case IPV6_OTCLASS: 2876 if (len != sizeof(u_int8_t)) 2877 return (EINVAL); 2878 2879 opt->ip6po_tclass = *(u_int8_t *)buf; 2880 break; 2881 2882 case IPV6_TCLASS: 2883 { 2884 int tclass; 2885 2886 if (len != sizeof(int)) 2887 return (EINVAL); 2888 tclass = *(int *)buf; 2889 if (tclass < -1 || tclass > 255) 2890 return (EINVAL); 2891 2892 opt->ip6po_tclass = tclass; 2893 break; 2894 } 2895 2896 #ifdef RFC2292 2897 case IPV6_2292NEXTHOP: 2898 #endif 2899 case IPV6_NEXTHOP: 2900 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2901 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2902 if (error) 2903 return (error); 2904 2905 if (len == 0) { /* just remove the option */ 2906 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2907 break; 2908 } 2909 2910 /* check if cmsg_len is large enough for sa_len */ 2911 if (len < sizeof(struct sockaddr) || len < *buf) 2912 return (EINVAL); 2913 2914 switch (((struct sockaddr *)buf)->sa_family) { 2915 case AF_INET6: 2916 { 2917 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2918 2919 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2920 return (EINVAL); 2921 2922 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2923 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2924 return (EINVAL); 2925 } 2926 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 2927 != 0) { 2928 return (error); 2929 } 2930 break; 2931 } 2932 case AF_LINK: /* eventually be supported? */ 2933 default: 2934 return (EAFNOSUPPORT); 2935 } 2936 2937 /* turn off the previous option, then set the new option. */ 2938 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2939 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2940 if (opt->ip6po_nexthop == NULL) 2941 return (ENOBUFS); 2942 memcpy(opt->ip6po_nexthop, buf, *buf); 2943 break; 2944 2945 #ifdef RFC2292 2946 case IPV6_2292HOPOPTS: 2947 #endif 2948 case IPV6_HOPOPTS: 2949 { 2950 struct ip6_hbh *hbh; 2951 int hbhlen; 2952 2953 /* 2954 * XXX: We don't allow a non-privileged user to set ANY HbH 2955 * options, since per-option restriction has too much 2956 * overhead. 2957 */ 2958 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2959 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2960 if (error) 2961 return (error); 2962 2963 if (len == 0) { 2964 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2965 break; /* just remove the option */ 2966 } 2967 2968 /* message length validation */ 2969 if (len < sizeof(struct ip6_hbh)) 2970 return (EINVAL); 2971 hbh = (struct ip6_hbh *)buf; 2972 hbhlen = (hbh->ip6h_len + 1) << 3; 2973 if (len != hbhlen) 2974 return (EINVAL); 2975 2976 /* turn off the previous option, then set the new option. */ 2977 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2978 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2979 if (opt->ip6po_hbh == NULL) 2980 return (ENOBUFS); 2981 memcpy(opt->ip6po_hbh, hbh, hbhlen); 2982 2983 break; 2984 } 2985 2986 #ifdef RFC2292 2987 case IPV6_2292DSTOPTS: 2988 #endif 2989 case IPV6_DSTOPTS: 2990 case IPV6_RTHDRDSTOPTS: 2991 { 2992 struct ip6_dest *dest, **newdest = NULL; 2993 int destlen; 2994 2995 /* XXX: see the comment for IPV6_HOPOPTS */ 2996 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2997 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2998 if (error) 2999 return (error); 3000 3001 if (len == 0) { 3002 ip6_clearpktopts(opt, optname); 3003 break; /* just remove the option */ 3004 } 3005 3006 /* message length validation */ 3007 if (len < sizeof(struct ip6_dest)) 3008 return (EINVAL); 3009 dest = (struct ip6_dest *)buf; 3010 destlen = (dest->ip6d_len + 1) << 3; 3011 if (len != destlen) 3012 return (EINVAL); 3013 /* 3014 * Determine the position that the destination options header 3015 * should be inserted; before or after the routing header. 3016 */ 3017 switch (optname) { 3018 case IPV6_2292DSTOPTS: 3019 /* 3020 * The old advanced API is ambiguous on this point. 3021 * Our approach is to determine the position based 3022 * according to the existence of a routing header. 3023 * Note, however, that this depends on the order of the 3024 * extension headers in the ancillary data; the 1st 3025 * part of the destination options header must appear 3026 * before the routing header in the ancillary data, 3027 * too. 3028 * RFC3542 solved the ambiguity by introducing 3029 * separate ancillary data or option types. 3030 */ 3031 if (opt->ip6po_rthdr == NULL) 3032 newdest = &opt->ip6po_dest1; 3033 else 3034 newdest = &opt->ip6po_dest2; 3035 break; 3036 case IPV6_RTHDRDSTOPTS: 3037 newdest = &opt->ip6po_dest1; 3038 break; 3039 case IPV6_DSTOPTS: 3040 newdest = &opt->ip6po_dest2; 3041 break; 3042 } 3043 3044 /* turn off the previous option, then set the new option. */ 3045 ip6_clearpktopts(opt, optname); 3046 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3047 if (*newdest == NULL) 3048 return (ENOBUFS); 3049 memcpy(*newdest, dest, destlen); 3050 3051 break; 3052 } 3053 3054 #ifdef RFC2292 3055 case IPV6_2292RTHDR: 3056 #endif 3057 case IPV6_RTHDR: 3058 { 3059 struct ip6_rthdr *rth; 3060 int rthlen; 3061 3062 if (len == 0) { 3063 ip6_clearpktopts(opt, IPV6_RTHDR); 3064 break; /* just remove the option */ 3065 } 3066 3067 /* message length validation */ 3068 if (len < sizeof(struct ip6_rthdr)) 3069 return (EINVAL); 3070 rth = (struct ip6_rthdr *)buf; 3071 rthlen = (rth->ip6r_len + 1) << 3; 3072 if (len != rthlen) 3073 return (EINVAL); 3074 switch (rth->ip6r_type) { 3075 case IPV6_RTHDR_TYPE_0: 3076 if (rth->ip6r_len == 0) /* must contain one addr */ 3077 return (EINVAL); 3078 if (rth->ip6r_len % 2) /* length must be even */ 3079 return (EINVAL); 3080 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3081 return (EINVAL); 3082 break; 3083 default: 3084 return (EINVAL); /* not supported */ 3085 } 3086 /* turn off the previous option */ 3087 ip6_clearpktopts(opt, IPV6_RTHDR); 3088 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3089 if (opt->ip6po_rthdr == NULL) 3090 return (ENOBUFS); 3091 memcpy(opt->ip6po_rthdr, rth, rthlen); 3092 break; 3093 } 3094 3095 case IPV6_USE_MIN_MTU: 3096 if (len != sizeof(int)) 3097 return (EINVAL); 3098 minmtupolicy = *(int *)buf; 3099 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3100 minmtupolicy != IP6PO_MINMTU_DISABLE && 3101 minmtupolicy != IP6PO_MINMTU_ALL) { 3102 return (EINVAL); 3103 } 3104 opt->ip6po_minmtu = minmtupolicy; 3105 break; 3106 3107 case IPV6_DONTFRAG: 3108 if (len != sizeof(int)) 3109 return (EINVAL); 3110 3111 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3112 /* 3113 * we ignore this option for TCP sockets. 3114 * (RFC3542 leaves this case unspecified.) 3115 */ 3116 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3117 } else 3118 opt->ip6po_flags |= IP6PO_DONTFRAG; 3119 break; 3120 3121 case IPV6_PREFER_TEMPADDR: 3122 { 3123 int preftemp; 3124 3125 if (len != sizeof(int)) 3126 return (EINVAL); 3127 preftemp = *(int *)buf; 3128 switch (preftemp) { 3129 case IP6PO_TEMPADDR_SYSTEM: 3130 case IP6PO_TEMPADDR_NOTPREFER: 3131 case IP6PO_TEMPADDR_PREFER: 3132 break; 3133 default: 3134 return (EINVAL); 3135 } 3136 opt->ip6po_prefer_tempaddr = preftemp; 3137 break; 3138 } 3139 3140 default: 3141 return (ENOPROTOOPT); 3142 } /* end of switch */ 3143 3144 return (0); 3145 } 3146 3147 /* 3148 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3149 * packet to the input queue of a specified interface. Note that this 3150 * calls the output routine of the loopback "driver", but with an interface 3151 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3152 */ 3153 void 3154 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3155 const struct sockaddr_in6 *dst) 3156 { 3157 struct mbuf *copym; 3158 struct ip6_hdr *ip6; 3159 3160 copym = m_copy(m, 0, M_COPYALL); 3161 if (copym == NULL) 3162 return; 3163 3164 /* 3165 * Make sure to deep-copy IPv6 header portion in case the data 3166 * is in an mbuf cluster, so that we can safely override the IPv6 3167 * header portion later. 3168 */ 3169 if ((copym->m_flags & M_EXT) != 0 || 3170 copym->m_len < sizeof(struct ip6_hdr)) { 3171 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3172 if (copym == NULL) 3173 return; 3174 } 3175 3176 #ifdef DIAGNOSTIC 3177 if (copym->m_len < sizeof(*ip6)) { 3178 m_freem(copym); 3179 return; 3180 } 3181 #endif 3182 3183 ip6 = mtod(copym, struct ip6_hdr *); 3184 /* 3185 * clear embedded scope identifiers if necessary. 3186 * in6_clearscope will touch the addresses only when necessary. 3187 */ 3188 in6_clearscope(&ip6->ip6_src); 3189 in6_clearscope(&ip6->ip6_dst); 3190 3191 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3192 } 3193 3194 /* 3195 * Chop IPv6 header off from the payload. 3196 */ 3197 static int 3198 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3199 { 3200 struct mbuf *mh; 3201 struct ip6_hdr *ip6; 3202 3203 ip6 = mtod(m, struct ip6_hdr *); 3204 if (m->m_len > sizeof(*ip6)) { 3205 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3206 if (mh == 0) { 3207 m_freem(m); 3208 return ENOBUFS; 3209 } 3210 M_MOVE_PKTHDR(mh, m); 3211 MH_ALIGN(mh, sizeof(*ip6)); 3212 m->m_len -= sizeof(*ip6); 3213 m->m_data += sizeof(*ip6); 3214 mh->m_next = m; 3215 m = mh; 3216 m->m_len = sizeof(*ip6); 3217 bcopy((void *)ip6, mtod(m, void *), sizeof(*ip6)); 3218 } 3219 exthdrs->ip6e_ip6 = m; 3220 return 0; 3221 } 3222 3223 /* 3224 * Compute IPv6 extension header length. 3225 */ 3226 int 3227 ip6_optlen(struct in6pcb *in6p) 3228 { 3229 int len; 3230 3231 if (!in6p->in6p_outputopts) 3232 return 0; 3233 3234 len = 0; 3235 #define elen(x) \ 3236 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3237 3238 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3239 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3240 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3241 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3242 return len; 3243 #undef elen 3244 } 3245
Indexes created Mon Sep 22 13:09:51 GMT 2025