ip6_output.c revision 1.170
1 /* $NetBSD: ip6_output.c,v 1.170 2016/06/21 10:25:27 ozaki-r 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 1.170 2016/06/21 10:25:27 ozaki-r 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, *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 ifp = NULL; 495 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 496 &ifp, &psref, &rt, 0)) != 0) { 497 if (ifp != NULL) 498 in6_ifstat_inc(ifp, ifs6_out_discard); 499 goto bad; 500 } 501 if (rt == NULL) { 502 /* 503 * If in6_selectroute() does not return a route entry, 504 * dst may not have been updated. 505 */ 506 error = rtcache_setdst(ro, sin6tosa(&dst_sa)); 507 if (error) { 508 goto bad; 509 } 510 } 511 512 /* 513 * then rt (for unicast) and ifp must be non-NULL valid values. 514 */ 515 if ((flags & IPV6_FORWARDING) == 0) { 516 /* XXX: the FORWARDING flag can be set for mrouting. */ 517 in6_ifstat_inc(ifp, ifs6_out_request); 518 } 519 if (rt != NULL) { 520 ia = (struct in6_ifaddr *)(rt->rt_ifa); 521 rt->rt_use++; 522 } 523 524 /* 525 * The outgoing interface must be in the zone of source and 526 * destination addresses. We should use ia_ifp to support the 527 * case of sending packets to an address of our own. 528 */ 529 if (ia != NULL && ia->ia_ifp) { 530 origifp = ia->ia_ifp; 531 if_acquire_NOMPSAFE(origifp, &psref_ia); 532 release_psref_ia = true; 533 } else 534 origifp = ifp; 535 536 src0 = ip6->ip6_src; 537 if (in6_setscope(&src0, origifp, &zone)) 538 goto badscope; 539 sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); 540 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 541 goto badscope; 542 543 dst0 = ip6->ip6_dst; 544 if (in6_setscope(&dst0, origifp, &zone)) 545 goto badscope; 546 /* re-initialize to be sure */ 547 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 548 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 549 goto badscope; 550 551 /* scope check is done. */ 552 553 if (rt == NULL || IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 554 dst = satocsin6(rtcache_getdst(ro)); 555 KASSERT(dst != NULL); 556 } else if (opt && rtcache_validate(&opt->ip6po_nextroute) != NULL) { 557 /* 558 * The nexthop is explicitly specified by the 559 * application. We assume the next hop is an IPv6 560 * address. 561 */ 562 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 563 } else if ((rt->rt_flags & RTF_GATEWAY)) 564 dst = (struct sockaddr_in6 *)rt->rt_gateway; 565 else 566 dst = satocsin6(rtcache_getdst(ro)); 567 568 /* 569 * XXXXXX: original code follows: 570 */ 571 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 572 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 573 else { 574 struct in6_multi *in6m; 575 576 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 577 578 in6_ifstat_inc(ifp, ifs6_out_mcast); 579 580 /* 581 * Confirm that the outgoing interface supports multicast. 582 */ 583 if (!(ifp->if_flags & IFF_MULTICAST)) { 584 IP6_STATINC(IP6_STAT_NOROUTE); 585 in6_ifstat_inc(ifp, ifs6_out_discard); 586 error = ENETUNREACH; 587 goto bad; 588 } 589 590 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 591 if (in6m != NULL && 592 (im6o == NULL || im6o->im6o_multicast_loop)) { 593 /* 594 * If we belong to the destination multicast group 595 * on the outgoing interface, and the caller did not 596 * forbid loopback, loop back a copy. 597 */ 598 KASSERT(dst != NULL); 599 ip6_mloopback(ifp, m, dst); 600 } else { 601 /* 602 * If we are acting as a multicast router, perform 603 * multicast forwarding as if the packet had just 604 * arrived on the interface to which we are about 605 * to send. The multicast forwarding function 606 * recursively calls this function, using the 607 * IPV6_FORWARDING flag to prevent infinite recursion. 608 * 609 * Multicasts that are looped back by ip6_mloopback(), 610 * above, will be forwarded by the ip6_input() routine, 611 * if necessary. 612 */ 613 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 614 if (ip6_mforward(ip6, ifp, m) != 0) { 615 m_freem(m); 616 goto done; 617 } 618 } 619 } 620 /* 621 * Multicasts with a hoplimit of zero may be looped back, 622 * above, but must not be transmitted on a network. 623 * Also, multicasts addressed to the loopback interface 624 * are not sent -- the above call to ip6_mloopback() will 625 * loop back a copy if this host actually belongs to the 626 * destination group on the loopback interface. 627 */ 628 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 629 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 630 m_freem(m); 631 goto done; 632 } 633 } 634 635 /* 636 * Fill the outgoing inteface to tell the upper layer 637 * to increment per-interface statistics. 638 */ 639 if (ifpp) 640 *ifpp = ifp; 641 642 /* Determine path MTU. */ 643 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 644 &alwaysfrag)) != 0) 645 goto bad; 646 647 /* 648 * The caller of this function may specify to use the minimum MTU 649 * in some cases. 650 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 651 * setting. The logic is a bit complicated; by default, unicast 652 * packets will follow path MTU while multicast packets will be sent at 653 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 654 * including unicast ones will be sent at the minimum MTU. Multicast 655 * packets will always be sent at the minimum MTU unless 656 * IP6PO_MINMTU_DISABLE is explicitly specified. 657 * See RFC 3542 for more details. 658 */ 659 if (mtu > IPV6_MMTU) { 660 if ((flags & IPV6_MINMTU)) 661 mtu = IPV6_MMTU; 662 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 663 mtu = IPV6_MMTU; 664 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 665 (opt == NULL || 666 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 667 mtu = IPV6_MMTU; 668 } 669 } 670 671 /* 672 * clear embedded scope identifiers if necessary. 673 * in6_clearscope will touch the addresses only when necessary. 674 */ 675 in6_clearscope(&ip6->ip6_src); 676 in6_clearscope(&ip6->ip6_dst); 677 678 /* 679 * If the outgoing packet contains a hop-by-hop options header, 680 * it must be examined and processed even by the source node. 681 * (RFC 2460, section 4.) 682 */ 683 if (ip6->ip6_nxt == IPV6_HOPOPTS) { 684 u_int32_t dummy1; /* XXX unused */ 685 u_int32_t dummy2; /* XXX unused */ 686 int hoff = sizeof(struct ip6_hdr); 687 688 if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) { 689 /* m was already freed at this point */ 690 error = EINVAL;/* better error? */ 691 goto done; 692 } 693 694 ip6 = mtod(m, struct ip6_hdr *); 695 } 696 697 /* 698 * Run through list of hooks for output packets. 699 */ 700 if ((error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 701 goto done; 702 if (m == NULL) 703 goto done; 704 ip6 = mtod(m, struct ip6_hdr *); 705 706 /* 707 * Send the packet to the outgoing interface. 708 * If necessary, do IPv6 fragmentation before sending. 709 * 710 * the logic here is rather complex: 711 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 712 * 1-a: send as is if tlen <= path mtu 713 * 1-b: fragment if tlen > path mtu 714 * 715 * 2: if user asks us not to fragment (dontfrag == 1) 716 * 2-a: send as is if tlen <= interface mtu 717 * 2-b: error if tlen > interface mtu 718 * 719 * 3: if we always need to attach fragment header (alwaysfrag == 1) 720 * always fragment 721 * 722 * 4: if dontfrag == 1 && alwaysfrag == 1 723 * error, as we cannot handle this conflicting request 724 */ 725 tlen = m->m_pkthdr.len; 726 tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; 727 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 728 dontfrag = 1; 729 else 730 dontfrag = 0; 731 732 if (dontfrag && alwaysfrag) { /* case 4 */ 733 /* conflicting request - can't transmit */ 734 error = EMSGSIZE; 735 goto bad; 736 } 737 if (dontfrag && (!tso && tlen > IN6_LINKMTU(ifp))) { /* case 2-b */ 738 /* 739 * Even if the DONTFRAG option is specified, we cannot send the 740 * packet when the data length is larger than the MTU of the 741 * outgoing interface. 742 * Notify the error by sending IPV6_PATHMTU ancillary data as 743 * well as returning an error code (the latter is not described 744 * in the API spec.) 745 */ 746 u_int32_t mtu32; 747 struct ip6ctlparam ip6cp; 748 749 mtu32 = (u_int32_t)mtu; 750 memset(&ip6cp, 0, sizeof(ip6cp)); 751 ip6cp.ip6c_cmdarg = (void *)&mtu32; 752 pfctlinput2(PRC_MSGSIZE, 753 rtcache_getdst(ro_pmtu), &ip6cp); 754 755 error = EMSGSIZE; 756 goto bad; 757 } 758 759 /* 760 * transmit packet without fragmentation 761 */ 762 if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { 763 /* case 1-a and 2-a */ 764 struct in6_ifaddr *ia6; 765 int sw_csum; 766 767 ip6 = mtod(m, struct ip6_hdr *); 768 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 769 if (ia6) { 770 /* Record statistics for this interface address. */ 771 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 772 } 773 774 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 775 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 776 if (IN6_NEED_CHECKSUM(ifp, 777 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 778 in6_delayed_cksum(m); 779 } 780 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 781 } 782 783 KASSERT(dst != NULL); 784 if (__predict_true(!tso || 785 (ifp->if_capenable & IFCAP_TSOv6) != 0)) { 786 error = nd6_output(ifp, origifp, m, dst, rt); 787 } else { 788 error = ip6_tso_output(ifp, origifp, m, dst, rt); 789 } 790 goto done; 791 } 792 793 if (tso) { 794 error = EINVAL; /* XXX */ 795 goto bad; 796 } 797 798 /* 799 * try to fragment the packet. case 1-b and 3 800 */ 801 if (mtu < IPV6_MMTU) { 802 /* path MTU cannot be less than IPV6_MMTU */ 803 error = EMSGSIZE; 804 in6_ifstat_inc(ifp, ifs6_out_fragfail); 805 goto bad; 806 } else if (ip6->ip6_plen == 0) { 807 /* jumbo payload cannot be fragmented */ 808 error = EMSGSIZE; 809 in6_ifstat_inc(ifp, ifs6_out_fragfail); 810 goto bad; 811 } else { 812 struct mbuf **mnext, *m_frgpart; 813 struct ip6_frag *ip6f; 814 u_int32_t id = htonl(ip6_randomid()); 815 u_char nextproto; 816 #if 0 /* see below */ 817 struct ip6ctlparam ip6cp; 818 u_int32_t mtu32; 819 #endif 820 821 /* 822 * Too large for the destination or interface; 823 * fragment if possible. 824 * Must be able to put at least 8 bytes per fragment. 825 */ 826 hlen = unfragpartlen; 827 if (mtu > IPV6_MAXPACKET) 828 mtu = IPV6_MAXPACKET; 829 830 #if 0 831 /* 832 * It is believed this code is a leftover from the 833 * development of the IPV6_RECVPATHMTU sockopt and 834 * associated work to implement RFC3542. 835 * It's not entirely clear what the intent of the API 836 * is at this point, so disable this code for now. 837 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 838 * will send notifications if the application requests. 839 */ 840 841 /* Notify a proper path MTU to applications. */ 842 mtu32 = (u_int32_t)mtu; 843 memset(&ip6cp, 0, sizeof(ip6cp)); 844 ip6cp.ip6c_cmdarg = (void *)&mtu32; 845 pfctlinput2(PRC_MSGSIZE, 846 rtcache_getdst(ro_pmtu), &ip6cp); 847 #endif 848 849 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 850 if (len < 8) { 851 error = EMSGSIZE; 852 in6_ifstat_inc(ifp, ifs6_out_fragfail); 853 goto bad; 854 } 855 856 mnext = &m->m_nextpkt; 857 858 /* 859 * Change the next header field of the last header in the 860 * unfragmentable part. 861 */ 862 if (exthdrs.ip6e_rthdr) { 863 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 864 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 865 } else if (exthdrs.ip6e_dest1) { 866 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 867 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 868 } else if (exthdrs.ip6e_hbh) { 869 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 870 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 871 } else { 872 nextproto = ip6->ip6_nxt; 873 ip6->ip6_nxt = IPPROTO_FRAGMENT; 874 } 875 876 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 877 != 0) { 878 if (IN6_NEED_CHECKSUM(ifp, 879 m->m_pkthdr.csum_flags & 880 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 881 in6_delayed_cksum(m); 882 } 883 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 884 } 885 886 /* 887 * Loop through length of segment after first fragment, 888 * make new header and copy data of each part and link onto 889 * chain. 890 */ 891 m0 = m; 892 for (off = hlen; off < tlen; off += len) { 893 struct mbuf *mlast; 894 895 MGETHDR(m, M_DONTWAIT, MT_HEADER); 896 if (!m) { 897 error = ENOBUFS; 898 IP6_STATINC(IP6_STAT_ODROPPED); 899 goto sendorfree; 900 } 901 m_reset_rcvif(m); 902 m->m_flags = m0->m_flags & M_COPYFLAGS; 903 *mnext = m; 904 mnext = &m->m_nextpkt; 905 m->m_data += max_linkhdr; 906 mhip6 = mtod(m, struct ip6_hdr *); 907 *mhip6 = *ip6; 908 m->m_len = sizeof(*mhip6); 909 /* 910 * ip6f must be valid if error is 0. But how 911 * can a compiler be expected to infer this? 912 */ 913 ip6f = NULL; 914 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 915 if (error) { 916 IP6_STATINC(IP6_STAT_ODROPPED); 917 goto sendorfree; 918 } 919 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 920 if (off + len >= tlen) 921 len = tlen - off; 922 else 923 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 924 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 925 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 926 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 927 error = ENOBUFS; 928 IP6_STATINC(IP6_STAT_ODROPPED); 929 goto sendorfree; 930 } 931 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 932 ; 933 mlast->m_next = m_frgpart; 934 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 935 m_reset_rcvif(m); 936 ip6f->ip6f_reserved = 0; 937 ip6f->ip6f_ident = id; 938 ip6f->ip6f_nxt = nextproto; 939 IP6_STATINC(IP6_STAT_OFRAGMENTS); 940 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 941 } 942 943 in6_ifstat_inc(ifp, ifs6_out_fragok); 944 } 945 946 /* 947 * Remove leading garbages. 948 */ 949 sendorfree: 950 m = m0->m_nextpkt; 951 m0->m_nextpkt = 0; 952 m_freem(m0); 953 for (m0 = m; m; m = m0) { 954 m0 = m->m_nextpkt; 955 m->m_nextpkt = 0; 956 if (error == 0) { 957 struct in6_ifaddr *ia6; 958 ip6 = mtod(m, struct ip6_hdr *); 959 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 960 if (ia6) { 961 /* 962 * Record statistics for this interface 963 * address. 964 */ 965 ia6->ia_ifa.ifa_data.ifad_outbytes += 966 m->m_pkthdr.len; 967 } 968 KASSERT(dst != NULL); 969 error = nd6_output(ifp, origifp, m, dst, rt); 970 } else 971 m_freem(m); 972 } 973 974 if (error == 0) 975 IP6_STATINC(IP6_STAT_FRAGMENTED); 976 977 done: 978 rtcache_free(&ip6route); 979 980 #ifdef IPSEC 981 if (sp != NULL) 982 KEY_FREESP(&sp); 983 #endif /* IPSEC */ 984 985 if_put(ifp, &psref); 986 if (release_psref_ia) 987 if_put(origifp, &psref_ia); 988 curlwp_bindx(bound); 989 990 return (error); 991 992 freehdrs: 993 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 994 m_freem(exthdrs.ip6e_dest1); 995 m_freem(exthdrs.ip6e_rthdr); 996 m_freem(exthdrs.ip6e_dest2); 997 /* FALLTHROUGH */ 998 bad: 999 m_freem(m); 1000 goto done; 1001 badscope: 1002 IP6_STATINC(IP6_STAT_BADSCOPE); 1003 in6_ifstat_inc(origifp, ifs6_out_discard); 1004 if (error == 0) 1005 error = EHOSTUNREACH; /* XXX */ 1006 goto bad; 1007 } 1008 1009 static int 1010 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1011 { 1012 struct mbuf *m; 1013 1014 if (hlen > MCLBYTES) 1015 return (ENOBUFS); /* XXX */ 1016 1017 MGET(m, M_DONTWAIT, MT_DATA); 1018 if (!m) 1019 return (ENOBUFS); 1020 1021 if (hlen > MLEN) { 1022 MCLGET(m, M_DONTWAIT); 1023 if ((m->m_flags & M_EXT) == 0) { 1024 m_free(m); 1025 return (ENOBUFS); 1026 } 1027 } 1028 m->m_len = hlen; 1029 if (hdr) 1030 bcopy(hdr, mtod(m, void *), hlen); 1031 1032 *mp = m; 1033 return (0); 1034 } 1035 1036 /* 1037 * Process a delayed payload checksum calculation. 1038 */ 1039 void 1040 in6_delayed_cksum(struct mbuf *m) 1041 { 1042 uint16_t csum, offset; 1043 1044 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1045 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1046 KASSERT((m->m_pkthdr.csum_flags 1047 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1048 1049 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1050 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1051 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1052 csum = 0xffff; 1053 } 1054 1055 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1056 if ((offset + sizeof(csum)) > m->m_len) { 1057 m_copyback(m, offset, sizeof(csum), &csum); 1058 } else { 1059 *(uint16_t *)(mtod(m, char *) + offset) = csum; 1060 } 1061 } 1062 1063 /* 1064 * Insert jumbo payload option. 1065 */ 1066 static int 1067 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1068 { 1069 struct mbuf *mopt; 1070 u_int8_t *optbuf; 1071 u_int32_t v; 1072 1073 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1074 1075 /* 1076 * If there is no hop-by-hop options header, allocate new one. 1077 * If there is one but it doesn't have enough space to store the 1078 * jumbo payload option, allocate a cluster to store the whole options. 1079 * Otherwise, use it to store the options. 1080 */ 1081 if (exthdrs->ip6e_hbh == 0) { 1082 MGET(mopt, M_DONTWAIT, MT_DATA); 1083 if (mopt == 0) 1084 return (ENOBUFS); 1085 mopt->m_len = JUMBOOPTLEN; 1086 optbuf = mtod(mopt, u_int8_t *); 1087 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1088 exthdrs->ip6e_hbh = mopt; 1089 } else { 1090 struct ip6_hbh *hbh; 1091 1092 mopt = exthdrs->ip6e_hbh; 1093 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1094 /* 1095 * XXX assumption: 1096 * - exthdrs->ip6e_hbh is not referenced from places 1097 * other than exthdrs. 1098 * - exthdrs->ip6e_hbh is not an mbuf chain. 1099 */ 1100 int oldoptlen = mopt->m_len; 1101 struct mbuf *n; 1102 1103 /* 1104 * XXX: give up if the whole (new) hbh header does 1105 * not fit even in an mbuf cluster. 1106 */ 1107 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1108 return (ENOBUFS); 1109 1110 /* 1111 * As a consequence, we must always prepare a cluster 1112 * at this point. 1113 */ 1114 MGET(n, M_DONTWAIT, MT_DATA); 1115 if (n) { 1116 MCLGET(n, M_DONTWAIT); 1117 if ((n->m_flags & M_EXT) == 0) { 1118 m_freem(n); 1119 n = NULL; 1120 } 1121 } 1122 if (!n) 1123 return (ENOBUFS); 1124 n->m_len = oldoptlen + JUMBOOPTLEN; 1125 bcopy(mtod(mopt, void *), mtod(n, void *), 1126 oldoptlen); 1127 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1128 m_freem(mopt); 1129 mopt = exthdrs->ip6e_hbh = n; 1130 } else { 1131 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1132 mopt->m_len += JUMBOOPTLEN; 1133 } 1134 optbuf[0] = IP6OPT_PADN; 1135 optbuf[1] = 0; 1136 1137 /* 1138 * Adjust the header length according to the pad and 1139 * the jumbo payload option. 1140 */ 1141 hbh = mtod(mopt, struct ip6_hbh *); 1142 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1143 } 1144 1145 /* fill in the option. */ 1146 optbuf[2] = IP6OPT_JUMBO; 1147 optbuf[3] = 4; 1148 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1149 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1150 1151 /* finally, adjust the packet header length */ 1152 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1153 1154 return (0); 1155 #undef JUMBOOPTLEN 1156 } 1157 1158 /* 1159 * Insert fragment header and copy unfragmentable header portions. 1160 * 1161 * *frghdrp will not be read, and it is guaranteed that either an 1162 * error is returned or that *frghdrp will point to space allocated 1163 * for the fragment header. 1164 */ 1165 static int 1166 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1167 struct ip6_frag **frghdrp) 1168 { 1169 struct mbuf *n, *mlast; 1170 1171 if (hlen > sizeof(struct ip6_hdr)) { 1172 n = m_copym(m0, sizeof(struct ip6_hdr), 1173 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1174 if (n == 0) 1175 return (ENOBUFS); 1176 m->m_next = n; 1177 } else 1178 n = m; 1179 1180 /* Search for the last mbuf of unfragmentable part. */ 1181 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1182 ; 1183 1184 if ((mlast->m_flags & M_EXT) == 0 && 1185 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1186 /* use the trailing space of the last mbuf for the fragment hdr */ 1187 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1188 mlast->m_len); 1189 mlast->m_len += sizeof(struct ip6_frag); 1190 m->m_pkthdr.len += sizeof(struct ip6_frag); 1191 } else { 1192 /* allocate a new mbuf for the fragment header */ 1193 struct mbuf *mfrg; 1194 1195 MGET(mfrg, M_DONTWAIT, MT_DATA); 1196 if (mfrg == 0) 1197 return (ENOBUFS); 1198 mfrg->m_len = sizeof(struct ip6_frag); 1199 *frghdrp = mtod(mfrg, struct ip6_frag *); 1200 mlast->m_next = mfrg; 1201 } 1202 1203 return (0); 1204 } 1205 1206 static int 1207 ip6_getpmtu(struct route *ro_pmtu, struct route *ro, struct ifnet *ifp, 1208 const struct in6_addr *dst, u_long *mtup, int *alwaysfragp) 1209 { 1210 struct rtentry *rt; 1211 u_int32_t mtu = 0; 1212 int alwaysfrag = 0; 1213 int error = 0; 1214 1215 if (ro_pmtu != ro) { 1216 union { 1217 struct sockaddr dst; 1218 struct sockaddr_in6 dst6; 1219 } u; 1220 1221 /* The first hop and the final destination may differ. */ 1222 sockaddr_in6_init(&u.dst6, dst, 0, 0, 0); 1223 rt = rtcache_lookup(ro_pmtu, &u.dst); 1224 } else 1225 rt = rtcache_validate(ro_pmtu); 1226 if (rt != NULL) { 1227 u_int32_t ifmtu; 1228 1229 if (ifp == NULL) 1230 ifp = rt->rt_ifp; 1231 ifmtu = IN6_LINKMTU(ifp); 1232 mtu = rt->rt_rmx.rmx_mtu; 1233 if (mtu == 0) 1234 mtu = ifmtu; 1235 else if (mtu < IPV6_MMTU) { 1236 /* 1237 * RFC2460 section 5, last paragraph: 1238 * if we record ICMPv6 too big message with 1239 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1240 * or smaller, with fragment header attached. 1241 * (fragment header is needed regardless from the 1242 * packet size, for translators to identify packets) 1243 */ 1244 alwaysfrag = 1; 1245 mtu = IPV6_MMTU; 1246 } else if (mtu > ifmtu) { 1247 /* 1248 * The MTU on the route is larger than the MTU on 1249 * the interface! This shouldn't happen, unless the 1250 * MTU of the interface has been changed after the 1251 * interface was brought up. Change the MTU in the 1252 * route to match the interface MTU (as long as the 1253 * field isn't locked). 1254 */ 1255 mtu = ifmtu; 1256 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1257 rt->rt_rmx.rmx_mtu = mtu; 1258 } 1259 } else if (ifp) { 1260 mtu = IN6_LINKMTU(ifp); 1261 } else 1262 error = EHOSTUNREACH; /* XXX */ 1263 1264 *mtup = mtu; 1265 if (alwaysfragp) 1266 *alwaysfragp = alwaysfrag; 1267 return (error); 1268 } 1269 1270 /* 1271 * IP6 socket option processing. 1272 */ 1273 int 1274 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1275 { 1276 int optdatalen, uproto; 1277 void *optdata; 1278 struct in6pcb *in6p = sotoin6pcb(so); 1279 struct ip_moptions **mopts; 1280 int error, optval; 1281 int level, optname; 1282 1283 KASSERT(sopt != NULL); 1284 1285 level = sopt->sopt_level; 1286 optname = sopt->sopt_name; 1287 1288 error = optval = 0; 1289 uproto = (int)so->so_proto->pr_protocol; 1290 1291 switch (level) { 1292 case IPPROTO_IP: 1293 switch (optname) { 1294 case IP_ADD_MEMBERSHIP: 1295 case IP_DROP_MEMBERSHIP: 1296 case IP_MULTICAST_IF: 1297 case IP_MULTICAST_LOOP: 1298 case IP_MULTICAST_TTL: 1299 mopts = &in6p->in6p_v4moptions; 1300 switch (op) { 1301 case PRCO_GETOPT: 1302 return ip_getmoptions(*mopts, sopt); 1303 case PRCO_SETOPT: 1304 return ip_setmoptions(mopts, sopt); 1305 default: 1306 return EINVAL; 1307 } 1308 default: 1309 return ENOPROTOOPT; 1310 } 1311 case IPPROTO_IPV6: 1312 break; 1313 default: 1314 return ENOPROTOOPT; 1315 } 1316 switch (op) { 1317 case PRCO_SETOPT: 1318 switch (optname) { 1319 #ifdef RFC2292 1320 case IPV6_2292PKTOPTIONS: 1321 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1322 break; 1323 #endif 1324 1325 /* 1326 * Use of some Hop-by-Hop options or some 1327 * Destination options, might require special 1328 * privilege. That is, normal applications 1329 * (without special privilege) might be forbidden 1330 * from setting certain options in outgoing packets, 1331 * and might never see certain options in received 1332 * packets. [RFC 2292 Section 6] 1333 * KAME specific note: 1334 * KAME prevents non-privileged users from sending or 1335 * receiving ANY hbh/dst options in order to avoid 1336 * overhead of parsing options in the kernel. 1337 */ 1338 case IPV6_RECVHOPOPTS: 1339 case IPV6_RECVDSTOPTS: 1340 case IPV6_RECVRTHDRDSTOPTS: 1341 error = kauth_authorize_network(kauth_cred_get(), 1342 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1343 NULL, NULL, NULL); 1344 if (error) 1345 break; 1346 /* FALLTHROUGH */ 1347 case IPV6_UNICAST_HOPS: 1348 case IPV6_HOPLIMIT: 1349 case IPV6_FAITH: 1350 1351 case IPV6_RECVPKTINFO: 1352 case IPV6_RECVHOPLIMIT: 1353 case IPV6_RECVRTHDR: 1354 case IPV6_RECVPATHMTU: 1355 case IPV6_RECVTCLASS: 1356 case IPV6_V6ONLY: 1357 error = sockopt_getint(sopt, &optval); 1358 if (error) 1359 break; 1360 switch (optname) { 1361 case IPV6_UNICAST_HOPS: 1362 if (optval < -1 || optval >= 256) 1363 error = EINVAL; 1364 else { 1365 /* -1 = kernel default */ 1366 in6p->in6p_hops = optval; 1367 } 1368 break; 1369 #define OPTSET(bit) \ 1370 do { \ 1371 if (optval) \ 1372 in6p->in6p_flags |= (bit); \ 1373 else \ 1374 in6p->in6p_flags &= ~(bit); \ 1375 } while (/*CONSTCOND*/ 0) 1376 1377 #ifdef RFC2292 1378 #define OPTSET2292(bit) \ 1379 do { \ 1380 in6p->in6p_flags |= IN6P_RFC2292; \ 1381 if (optval) \ 1382 in6p->in6p_flags |= (bit); \ 1383 else \ 1384 in6p->in6p_flags &= ~(bit); \ 1385 } while (/*CONSTCOND*/ 0) 1386 #endif 1387 1388 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1389 1390 case IPV6_RECVPKTINFO: 1391 #ifdef RFC2292 1392 /* cannot mix with RFC2292 */ 1393 if (OPTBIT(IN6P_RFC2292)) { 1394 error = EINVAL; 1395 break; 1396 } 1397 #endif 1398 OPTSET(IN6P_PKTINFO); 1399 break; 1400 1401 case IPV6_HOPLIMIT: 1402 { 1403 struct ip6_pktopts **optp; 1404 1405 #ifdef RFC2292 1406 /* cannot mix with RFC2292 */ 1407 if (OPTBIT(IN6P_RFC2292)) { 1408 error = EINVAL; 1409 break; 1410 } 1411 #endif 1412 optp = &in6p->in6p_outputopts; 1413 error = ip6_pcbopt(IPV6_HOPLIMIT, 1414 (u_char *)&optval, 1415 sizeof(optval), 1416 optp, 1417 kauth_cred_get(), uproto); 1418 break; 1419 } 1420 1421 case IPV6_RECVHOPLIMIT: 1422 #ifdef RFC2292 1423 /* cannot mix with RFC2292 */ 1424 if (OPTBIT(IN6P_RFC2292)) { 1425 error = EINVAL; 1426 break; 1427 } 1428 #endif 1429 OPTSET(IN6P_HOPLIMIT); 1430 break; 1431 1432 case IPV6_RECVHOPOPTS: 1433 #ifdef RFC2292 1434 /* cannot mix with RFC2292 */ 1435 if (OPTBIT(IN6P_RFC2292)) { 1436 error = EINVAL; 1437 break; 1438 } 1439 #endif 1440 OPTSET(IN6P_HOPOPTS); 1441 break; 1442 1443 case IPV6_RECVDSTOPTS: 1444 #ifdef RFC2292 1445 /* cannot mix with RFC2292 */ 1446 if (OPTBIT(IN6P_RFC2292)) { 1447 error = EINVAL; 1448 break; 1449 } 1450 #endif 1451 OPTSET(IN6P_DSTOPTS); 1452 break; 1453 1454 case IPV6_RECVRTHDRDSTOPTS: 1455 #ifdef RFC2292 1456 /* cannot mix with RFC2292 */ 1457 if (OPTBIT(IN6P_RFC2292)) { 1458 error = EINVAL; 1459 break; 1460 } 1461 #endif 1462 OPTSET(IN6P_RTHDRDSTOPTS); 1463 break; 1464 1465 case IPV6_RECVRTHDR: 1466 #ifdef RFC2292 1467 /* cannot mix with RFC2292 */ 1468 if (OPTBIT(IN6P_RFC2292)) { 1469 error = EINVAL; 1470 break; 1471 } 1472 #endif 1473 OPTSET(IN6P_RTHDR); 1474 break; 1475 1476 case IPV6_FAITH: 1477 OPTSET(IN6P_FAITH); 1478 break; 1479 1480 case IPV6_RECVPATHMTU: 1481 /* 1482 * We ignore this option for TCP 1483 * sockets. 1484 * (RFC3542 leaves this case 1485 * unspecified.) 1486 */ 1487 if (uproto != IPPROTO_TCP) 1488 OPTSET(IN6P_MTU); 1489 break; 1490 1491 case IPV6_V6ONLY: 1492 /* 1493 * make setsockopt(IPV6_V6ONLY) 1494 * available only prior to bind(2). 1495 * see ipng mailing list, Jun 22 2001. 1496 */ 1497 if (in6p->in6p_lport || 1498 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1499 error = EINVAL; 1500 break; 1501 } 1502 #ifdef INET6_BINDV6ONLY 1503 if (!optval) 1504 error = EINVAL; 1505 #else 1506 OPTSET(IN6P_IPV6_V6ONLY); 1507 #endif 1508 break; 1509 case IPV6_RECVTCLASS: 1510 #ifdef RFC2292 1511 /* cannot mix with RFC2292 XXX */ 1512 if (OPTBIT(IN6P_RFC2292)) { 1513 error = EINVAL; 1514 break; 1515 } 1516 #endif 1517 OPTSET(IN6P_TCLASS); 1518 break; 1519 1520 } 1521 break; 1522 1523 case IPV6_OTCLASS: 1524 { 1525 struct ip6_pktopts **optp; 1526 u_int8_t tclass; 1527 1528 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1529 if (error) 1530 break; 1531 optp = &in6p->in6p_outputopts; 1532 error = ip6_pcbopt(optname, 1533 (u_char *)&tclass, 1534 sizeof(tclass), 1535 optp, 1536 kauth_cred_get(), uproto); 1537 break; 1538 } 1539 1540 case IPV6_TCLASS: 1541 case IPV6_DONTFRAG: 1542 case IPV6_USE_MIN_MTU: 1543 case IPV6_PREFER_TEMPADDR: 1544 error = sockopt_getint(sopt, &optval); 1545 if (error) 1546 break; 1547 { 1548 struct ip6_pktopts **optp; 1549 optp = &in6p->in6p_outputopts; 1550 error = ip6_pcbopt(optname, 1551 (u_char *)&optval, 1552 sizeof(optval), 1553 optp, 1554 kauth_cred_get(), uproto); 1555 break; 1556 } 1557 1558 #ifdef RFC2292 1559 case IPV6_2292PKTINFO: 1560 case IPV6_2292HOPLIMIT: 1561 case IPV6_2292HOPOPTS: 1562 case IPV6_2292DSTOPTS: 1563 case IPV6_2292RTHDR: 1564 /* RFC 2292 */ 1565 error = sockopt_getint(sopt, &optval); 1566 if (error) 1567 break; 1568 1569 switch (optname) { 1570 case IPV6_2292PKTINFO: 1571 OPTSET2292(IN6P_PKTINFO); 1572 break; 1573 case IPV6_2292HOPLIMIT: 1574 OPTSET2292(IN6P_HOPLIMIT); 1575 break; 1576 case IPV6_2292HOPOPTS: 1577 /* 1578 * Check super-user privilege. 1579 * See comments for IPV6_RECVHOPOPTS. 1580 */ 1581 error = 1582 kauth_authorize_network(kauth_cred_get(), 1583 KAUTH_NETWORK_IPV6, 1584 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1585 NULL, NULL); 1586 if (error) 1587 return (error); 1588 OPTSET2292(IN6P_HOPOPTS); 1589 break; 1590 case IPV6_2292DSTOPTS: 1591 error = 1592 kauth_authorize_network(kauth_cred_get(), 1593 KAUTH_NETWORK_IPV6, 1594 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1595 NULL, NULL); 1596 if (error) 1597 return (error); 1598 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1599 break; 1600 case IPV6_2292RTHDR: 1601 OPTSET2292(IN6P_RTHDR); 1602 break; 1603 } 1604 break; 1605 #endif 1606 case IPV6_PKTINFO: 1607 case IPV6_HOPOPTS: 1608 case IPV6_RTHDR: 1609 case IPV6_DSTOPTS: 1610 case IPV6_RTHDRDSTOPTS: 1611 case IPV6_NEXTHOP: { 1612 /* new advanced API (RFC3542) */ 1613 void *optbuf; 1614 int optbuflen; 1615 struct ip6_pktopts **optp; 1616 1617 #ifdef RFC2292 1618 /* cannot mix with RFC2292 */ 1619 if (OPTBIT(IN6P_RFC2292)) { 1620 error = EINVAL; 1621 break; 1622 } 1623 #endif 1624 1625 optbuflen = sopt->sopt_size; 1626 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1627 if (optbuf == NULL) { 1628 error = ENOBUFS; 1629 break; 1630 } 1631 1632 error = sockopt_get(sopt, optbuf, optbuflen); 1633 if (error) { 1634 free(optbuf, M_IP6OPT); 1635 break; 1636 } 1637 optp = &in6p->in6p_outputopts; 1638 error = ip6_pcbopt(optname, optbuf, optbuflen, 1639 optp, kauth_cred_get(), uproto); 1640 1641 free(optbuf, M_IP6OPT); 1642 break; 1643 } 1644 #undef OPTSET 1645 1646 case IPV6_MULTICAST_IF: 1647 case IPV6_MULTICAST_HOPS: 1648 case IPV6_MULTICAST_LOOP: 1649 case IPV6_JOIN_GROUP: 1650 case IPV6_LEAVE_GROUP: 1651 error = ip6_setmoptions(sopt, in6p); 1652 break; 1653 1654 case IPV6_PORTRANGE: 1655 error = sockopt_getint(sopt, &optval); 1656 if (error) 1657 break; 1658 1659 switch (optval) { 1660 case IPV6_PORTRANGE_DEFAULT: 1661 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1662 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1663 break; 1664 1665 case IPV6_PORTRANGE_HIGH: 1666 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1667 in6p->in6p_flags |= IN6P_HIGHPORT; 1668 break; 1669 1670 case IPV6_PORTRANGE_LOW: 1671 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1672 in6p->in6p_flags |= IN6P_LOWPORT; 1673 break; 1674 1675 default: 1676 error = EINVAL; 1677 break; 1678 } 1679 break; 1680 1681 case IPV6_PORTALGO: 1682 error = sockopt_getint(sopt, &optval); 1683 if (error) 1684 break; 1685 1686 error = portalgo_algo_index_select( 1687 (struct inpcb_hdr *)in6p, optval); 1688 break; 1689 1690 #if defined(IPSEC) 1691 case IPV6_IPSEC_POLICY: 1692 if (ipsec_enabled) { 1693 error = ipsec6_set_policy(in6p, optname, 1694 sopt->sopt_data, sopt->sopt_size, 1695 kauth_cred_get()); 1696 break; 1697 } 1698 /*FALLTHROUGH*/ 1699 #endif /* IPSEC */ 1700 1701 default: 1702 error = ENOPROTOOPT; 1703 break; 1704 } 1705 break; 1706 1707 case PRCO_GETOPT: 1708 switch (optname) { 1709 #ifdef RFC2292 1710 case IPV6_2292PKTOPTIONS: 1711 /* 1712 * RFC3542 (effectively) deprecated the 1713 * semantics of the 2292-style pktoptions. 1714 * Since it was not reliable in nature (i.e., 1715 * applications had to expect the lack of some 1716 * information after all), it would make sense 1717 * to simplify this part by always returning 1718 * empty data. 1719 */ 1720 break; 1721 #endif 1722 1723 case IPV6_RECVHOPOPTS: 1724 case IPV6_RECVDSTOPTS: 1725 case IPV6_RECVRTHDRDSTOPTS: 1726 case IPV6_UNICAST_HOPS: 1727 case IPV6_RECVPKTINFO: 1728 case IPV6_RECVHOPLIMIT: 1729 case IPV6_RECVRTHDR: 1730 case IPV6_RECVPATHMTU: 1731 1732 case IPV6_FAITH: 1733 case IPV6_V6ONLY: 1734 case IPV6_PORTRANGE: 1735 case IPV6_RECVTCLASS: 1736 switch (optname) { 1737 1738 case IPV6_RECVHOPOPTS: 1739 optval = OPTBIT(IN6P_HOPOPTS); 1740 break; 1741 1742 case IPV6_RECVDSTOPTS: 1743 optval = OPTBIT(IN6P_DSTOPTS); 1744 break; 1745 1746 case IPV6_RECVRTHDRDSTOPTS: 1747 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1748 break; 1749 1750 case IPV6_UNICAST_HOPS: 1751 optval = in6p->in6p_hops; 1752 break; 1753 1754 case IPV6_RECVPKTINFO: 1755 optval = OPTBIT(IN6P_PKTINFO); 1756 break; 1757 1758 case IPV6_RECVHOPLIMIT: 1759 optval = OPTBIT(IN6P_HOPLIMIT); 1760 break; 1761 1762 case IPV6_RECVRTHDR: 1763 optval = OPTBIT(IN6P_RTHDR); 1764 break; 1765 1766 case IPV6_RECVPATHMTU: 1767 optval = OPTBIT(IN6P_MTU); 1768 break; 1769 1770 case IPV6_FAITH: 1771 optval = OPTBIT(IN6P_FAITH); 1772 break; 1773 1774 case IPV6_V6ONLY: 1775 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1776 break; 1777 1778 case IPV6_PORTRANGE: 1779 { 1780 int flags; 1781 flags = in6p->in6p_flags; 1782 if (flags & IN6P_HIGHPORT) 1783 optval = IPV6_PORTRANGE_HIGH; 1784 else if (flags & IN6P_LOWPORT) 1785 optval = IPV6_PORTRANGE_LOW; 1786 else 1787 optval = 0; 1788 break; 1789 } 1790 case IPV6_RECVTCLASS: 1791 optval = OPTBIT(IN6P_TCLASS); 1792 break; 1793 1794 } 1795 if (error) 1796 break; 1797 error = sockopt_setint(sopt, optval); 1798 break; 1799 1800 case IPV6_PATHMTU: 1801 { 1802 u_long pmtu = 0; 1803 struct ip6_mtuinfo mtuinfo; 1804 struct route *ro = &in6p->in6p_route; 1805 1806 if (!(so->so_state & SS_ISCONNECTED)) 1807 return (ENOTCONN); 1808 /* 1809 * XXX: we dot not consider the case of source 1810 * routing, or optional information to specify 1811 * the outgoing interface. 1812 */ 1813 error = ip6_getpmtu(ro, NULL, NULL, 1814 &in6p->in6p_faddr, &pmtu, NULL); 1815 if (error) 1816 break; 1817 if (pmtu > IPV6_MAXPACKET) 1818 pmtu = IPV6_MAXPACKET; 1819 1820 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1821 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1822 optdata = (void *)&mtuinfo; 1823 optdatalen = sizeof(mtuinfo); 1824 if (optdatalen > MCLBYTES) 1825 return (EMSGSIZE); /* XXX */ 1826 error = sockopt_set(sopt, optdata, optdatalen); 1827 break; 1828 } 1829 1830 #ifdef RFC2292 1831 case IPV6_2292PKTINFO: 1832 case IPV6_2292HOPLIMIT: 1833 case IPV6_2292HOPOPTS: 1834 case IPV6_2292RTHDR: 1835 case IPV6_2292DSTOPTS: 1836 switch (optname) { 1837 case IPV6_2292PKTINFO: 1838 optval = OPTBIT(IN6P_PKTINFO); 1839 break; 1840 case IPV6_2292HOPLIMIT: 1841 optval = OPTBIT(IN6P_HOPLIMIT); 1842 break; 1843 case IPV6_2292HOPOPTS: 1844 optval = OPTBIT(IN6P_HOPOPTS); 1845 break; 1846 case IPV6_2292RTHDR: 1847 optval = OPTBIT(IN6P_RTHDR); 1848 break; 1849 case IPV6_2292DSTOPTS: 1850 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1851 break; 1852 } 1853 error = sockopt_setint(sopt, optval); 1854 break; 1855 #endif 1856 case IPV6_PKTINFO: 1857 case IPV6_HOPOPTS: 1858 case IPV6_RTHDR: 1859 case IPV6_DSTOPTS: 1860 case IPV6_RTHDRDSTOPTS: 1861 case IPV6_NEXTHOP: 1862 case IPV6_OTCLASS: 1863 case IPV6_TCLASS: 1864 case IPV6_DONTFRAG: 1865 case IPV6_USE_MIN_MTU: 1866 case IPV6_PREFER_TEMPADDR: 1867 error = ip6_getpcbopt(in6p->in6p_outputopts, 1868 optname, sopt); 1869 break; 1870 1871 case IPV6_MULTICAST_IF: 1872 case IPV6_MULTICAST_HOPS: 1873 case IPV6_MULTICAST_LOOP: 1874 case IPV6_JOIN_GROUP: 1875 case IPV6_LEAVE_GROUP: 1876 error = ip6_getmoptions(sopt, in6p); 1877 break; 1878 1879 case IPV6_PORTALGO: 1880 optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; 1881 error = sockopt_setint(sopt, optval); 1882 break; 1883 1884 #if defined(IPSEC) 1885 case IPV6_IPSEC_POLICY: 1886 if (ipsec_used) { 1887 struct mbuf *m = NULL; 1888 1889 /* 1890 * XXX: this will return EINVAL as sopt is 1891 * empty 1892 */ 1893 error = ipsec6_get_policy(in6p, sopt->sopt_data, 1894 sopt->sopt_size, &m); 1895 if (!error) 1896 error = sockopt_setmbuf(sopt, m); 1897 break; 1898 } 1899 /*FALLTHROUGH*/ 1900 #endif /* IPSEC */ 1901 1902 default: 1903 error = ENOPROTOOPT; 1904 break; 1905 } 1906 break; 1907 } 1908 return (error); 1909 } 1910 1911 int 1912 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1913 { 1914 int error = 0, optval; 1915 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1916 struct in6pcb *in6p = sotoin6pcb(so); 1917 int level, optname; 1918 1919 KASSERT(sopt != NULL); 1920 1921 level = sopt->sopt_level; 1922 optname = sopt->sopt_name; 1923 1924 if (level != IPPROTO_IPV6) { 1925 return ENOPROTOOPT; 1926 } 1927 1928 switch (optname) { 1929 case IPV6_CHECKSUM: 1930 /* 1931 * For ICMPv6 sockets, no modification allowed for checksum 1932 * offset, permit "no change" values to help existing apps. 1933 * 1934 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 1935 * for an ICMPv6 socket will fail." The current 1936 * behavior does not meet RFC3542. 1937 */ 1938 switch (op) { 1939 case PRCO_SETOPT: 1940 error = sockopt_getint(sopt, &optval); 1941 if (error) 1942 break; 1943 if ((optval % 2) != 0) { 1944 /* the API assumes even offset values */ 1945 error = EINVAL; 1946 } else if (so->so_proto->pr_protocol == 1947 IPPROTO_ICMPV6) { 1948 if (optval != icmp6off) 1949 error = EINVAL; 1950 } else 1951 in6p->in6p_cksum = optval; 1952 break; 1953 1954 case PRCO_GETOPT: 1955 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1956 optval = icmp6off; 1957 else 1958 optval = in6p->in6p_cksum; 1959 1960 error = sockopt_setint(sopt, optval); 1961 break; 1962 1963 default: 1964 error = EINVAL; 1965 break; 1966 } 1967 break; 1968 1969 default: 1970 error = ENOPROTOOPT; 1971 break; 1972 } 1973 1974 return (error); 1975 } 1976 1977 #ifdef RFC2292 1978 /* 1979 * Set up IP6 options in pcb for insertion in output packets or 1980 * specifying behavior of outgoing packets. 1981 */ 1982 static int 1983 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 1984 struct sockopt *sopt) 1985 { 1986 struct ip6_pktopts *opt = *pktopt; 1987 struct mbuf *m; 1988 int error = 0; 1989 1990 /* turn off any old options. */ 1991 if (opt) { 1992 #ifdef DIAGNOSTIC 1993 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1994 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1995 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1996 printf("ip6_pcbopts: all specified options are cleared.\n"); 1997 #endif 1998 ip6_clearpktopts(opt, -1); 1999 } else { 2000 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2001 if (opt == NULL) 2002 return (ENOBUFS); 2003 } 2004 *pktopt = NULL; 2005 2006 if (sopt == NULL || sopt->sopt_size == 0) { 2007 /* 2008 * Only turning off any previous options, regardless of 2009 * whether the opt is just created or given. 2010 */ 2011 free(opt, M_IP6OPT); 2012 return (0); 2013 } 2014 2015 /* set options specified by user. */ 2016 m = sockopt_getmbuf(sopt); 2017 if (m == NULL) { 2018 free(opt, M_IP6OPT); 2019 return (ENOBUFS); 2020 } 2021 2022 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2023 so->so_proto->pr_protocol); 2024 m_freem(m); 2025 if (error != 0) { 2026 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2027 free(opt, M_IP6OPT); 2028 return (error); 2029 } 2030 *pktopt = opt; 2031 return (0); 2032 } 2033 #endif 2034 2035 /* 2036 * initialize ip6_pktopts. beware that there are non-zero default values in 2037 * the struct. 2038 */ 2039 void 2040 ip6_initpktopts(struct ip6_pktopts *opt) 2041 { 2042 2043 memset(opt, 0, sizeof(*opt)); 2044 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2045 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2046 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2047 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2048 } 2049 2050 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2051 static int 2052 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2053 kauth_cred_t cred, int uproto) 2054 { 2055 struct ip6_pktopts *opt; 2056 2057 if (*pktopt == NULL) { 2058 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2059 M_NOWAIT); 2060 if (*pktopt == NULL) 2061 return (ENOBUFS); 2062 2063 ip6_initpktopts(*pktopt); 2064 } 2065 opt = *pktopt; 2066 2067 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2068 } 2069 2070 static int 2071 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2072 { 2073 void *optdata = NULL; 2074 int optdatalen = 0; 2075 struct ip6_ext *ip6e; 2076 int error = 0; 2077 struct in6_pktinfo null_pktinfo; 2078 int deftclass = 0, on; 2079 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2080 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2081 2082 switch (optname) { 2083 case IPV6_PKTINFO: 2084 if (pktopt && pktopt->ip6po_pktinfo) 2085 optdata = (void *)pktopt->ip6po_pktinfo; 2086 else { 2087 /* XXX: we don't have to do this every time... */ 2088 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2089 optdata = (void *)&null_pktinfo; 2090 } 2091 optdatalen = sizeof(struct in6_pktinfo); 2092 break; 2093 case IPV6_OTCLASS: 2094 /* XXX */ 2095 return (EINVAL); 2096 case IPV6_TCLASS: 2097 if (pktopt && pktopt->ip6po_tclass >= 0) 2098 optdata = (void *)&pktopt->ip6po_tclass; 2099 else 2100 optdata = (void *)&deftclass; 2101 optdatalen = sizeof(int); 2102 break; 2103 case IPV6_HOPOPTS: 2104 if (pktopt && pktopt->ip6po_hbh) { 2105 optdata = (void *)pktopt->ip6po_hbh; 2106 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2107 optdatalen = (ip6e->ip6e_len + 1) << 3; 2108 } 2109 break; 2110 case IPV6_RTHDR: 2111 if (pktopt && pktopt->ip6po_rthdr) { 2112 optdata = (void *)pktopt->ip6po_rthdr; 2113 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2114 optdatalen = (ip6e->ip6e_len + 1) << 3; 2115 } 2116 break; 2117 case IPV6_RTHDRDSTOPTS: 2118 if (pktopt && pktopt->ip6po_dest1) { 2119 optdata = (void *)pktopt->ip6po_dest1; 2120 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2121 optdatalen = (ip6e->ip6e_len + 1) << 3; 2122 } 2123 break; 2124 case IPV6_DSTOPTS: 2125 if (pktopt && pktopt->ip6po_dest2) { 2126 optdata = (void *)pktopt->ip6po_dest2; 2127 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2128 optdatalen = (ip6e->ip6e_len + 1) << 3; 2129 } 2130 break; 2131 case IPV6_NEXTHOP: 2132 if (pktopt && pktopt->ip6po_nexthop) { 2133 optdata = (void *)pktopt->ip6po_nexthop; 2134 optdatalen = pktopt->ip6po_nexthop->sa_len; 2135 } 2136 break; 2137 case IPV6_USE_MIN_MTU: 2138 if (pktopt) 2139 optdata = (void *)&pktopt->ip6po_minmtu; 2140 else 2141 optdata = (void *)&defminmtu; 2142 optdatalen = sizeof(int); 2143 break; 2144 case IPV6_DONTFRAG: 2145 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2146 on = 1; 2147 else 2148 on = 0; 2149 optdata = (void *)&on; 2150 optdatalen = sizeof(on); 2151 break; 2152 case IPV6_PREFER_TEMPADDR: 2153 if (pktopt) 2154 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2155 else 2156 optdata = (void *)&defpreftemp; 2157 optdatalen = sizeof(int); 2158 break; 2159 default: /* should not happen */ 2160 #ifdef DIAGNOSTIC 2161 panic("ip6_getpcbopt: unexpected option\n"); 2162 #endif 2163 return (ENOPROTOOPT); 2164 } 2165 2166 error = sockopt_set(sopt, optdata, optdatalen); 2167 2168 return (error); 2169 } 2170 2171 void 2172 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2173 { 2174 if (optname == -1 || optname == IPV6_PKTINFO) { 2175 if (pktopt->ip6po_pktinfo) 2176 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2177 pktopt->ip6po_pktinfo = NULL; 2178 } 2179 if (optname == -1 || optname == IPV6_HOPLIMIT) 2180 pktopt->ip6po_hlim = -1; 2181 if (optname == -1 || optname == IPV6_TCLASS) 2182 pktopt->ip6po_tclass = -1; 2183 if (optname == -1 || optname == IPV6_NEXTHOP) { 2184 rtcache_free(&pktopt->ip6po_nextroute); 2185 if (pktopt->ip6po_nexthop) 2186 free(pktopt->ip6po_nexthop, M_IP6OPT); 2187 pktopt->ip6po_nexthop = NULL; 2188 } 2189 if (optname == -1 || optname == IPV6_HOPOPTS) { 2190 if (pktopt->ip6po_hbh) 2191 free(pktopt->ip6po_hbh, M_IP6OPT); 2192 pktopt->ip6po_hbh = NULL; 2193 } 2194 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2195 if (pktopt->ip6po_dest1) 2196 free(pktopt->ip6po_dest1, M_IP6OPT); 2197 pktopt->ip6po_dest1 = NULL; 2198 } 2199 if (optname == -1 || optname == IPV6_RTHDR) { 2200 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2201 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2202 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2203 rtcache_free(&pktopt->ip6po_route); 2204 } 2205 if (optname == -1 || optname == IPV6_DSTOPTS) { 2206 if (pktopt->ip6po_dest2) 2207 free(pktopt->ip6po_dest2, M_IP6OPT); 2208 pktopt->ip6po_dest2 = NULL; 2209 } 2210 } 2211 2212 #define PKTOPT_EXTHDRCPY(type) \ 2213 do { \ 2214 if (src->type) { \ 2215 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2216 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2217 if (dst->type == NULL) \ 2218 goto bad; \ 2219 memcpy(dst->type, src->type, hlen); \ 2220 } \ 2221 } while (/*CONSTCOND*/ 0) 2222 2223 static int 2224 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2225 { 2226 dst->ip6po_hlim = src->ip6po_hlim; 2227 dst->ip6po_tclass = src->ip6po_tclass; 2228 dst->ip6po_flags = src->ip6po_flags; 2229 dst->ip6po_minmtu = src->ip6po_minmtu; 2230 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2231 if (src->ip6po_pktinfo) { 2232 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2233 M_IP6OPT, canwait); 2234 if (dst->ip6po_pktinfo == NULL) 2235 goto bad; 2236 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2237 } 2238 if (src->ip6po_nexthop) { 2239 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2240 M_IP6OPT, canwait); 2241 if (dst->ip6po_nexthop == NULL) 2242 goto bad; 2243 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2244 src->ip6po_nexthop->sa_len); 2245 } 2246 PKTOPT_EXTHDRCPY(ip6po_hbh); 2247 PKTOPT_EXTHDRCPY(ip6po_dest1); 2248 PKTOPT_EXTHDRCPY(ip6po_dest2); 2249 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2250 return (0); 2251 2252 bad: 2253 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2254 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2255 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2256 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2257 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2258 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2259 2260 return (ENOBUFS); 2261 } 2262 #undef PKTOPT_EXTHDRCPY 2263 2264 struct ip6_pktopts * 2265 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2266 { 2267 int error; 2268 struct ip6_pktopts *dst; 2269 2270 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2271 if (dst == NULL) 2272 return (NULL); 2273 ip6_initpktopts(dst); 2274 2275 if ((error = copypktopts(dst, src, canwait)) != 0) { 2276 free(dst, M_IP6OPT); 2277 return (NULL); 2278 } 2279 2280 return (dst); 2281 } 2282 2283 void 2284 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2285 { 2286 if (pktopt == NULL) 2287 return; 2288 2289 ip6_clearpktopts(pktopt, -1); 2290 2291 free(pktopt, M_IP6OPT); 2292 } 2293 2294 int 2295 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, void *v, 2296 size_t l) 2297 { 2298 struct ipv6_mreq mreq; 2299 int error; 2300 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2301 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2302 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2303 if (error != 0) 2304 return error; 2305 2306 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2307 /* 2308 * We use the unspecified address to specify to accept 2309 * all multicast addresses. Only super user is allowed 2310 * to do this. 2311 */ 2312 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, 2313 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2314 return EACCES; 2315 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2316 // Don't bother if we are not going to use ifp. 2317 if (l == sizeof(*ia)) { 2318 memcpy(v, ia, l); 2319 return 0; 2320 } 2321 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2322 return EINVAL; 2323 } 2324 2325 /* 2326 * If no interface was explicitly specified, choose an 2327 * appropriate one according to the given multicast address. 2328 */ 2329 if (mreq.ipv6mr_interface == 0) { 2330 struct rtentry *rt; 2331 union { 2332 struct sockaddr dst; 2333 struct sockaddr_in dst4; 2334 struct sockaddr_in6 dst6; 2335 } u; 2336 struct route ro; 2337 2338 /* 2339 * Look up the routing table for the 2340 * address, and choose the outgoing interface. 2341 * XXX: is it a good approach? 2342 */ 2343 memset(&ro, 0, sizeof(ro)); 2344 if (IN6_IS_ADDR_V4MAPPED(ia)) 2345 sockaddr_in_init(&u.dst4, ia4, 0); 2346 else 2347 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2348 error = rtcache_setdst(&ro, &u.dst); 2349 if (error != 0) 2350 return error; 2351 *ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp : NULL; 2352 rtcache_free(&ro); 2353 } else { 2354 /* 2355 * If the interface is specified, validate it. 2356 */ 2357 if ((*ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) 2358 return ENXIO; /* XXX EINVAL? */ 2359 } 2360 if (sizeof(*ia) == l) 2361 memcpy(v, ia, l); 2362 else 2363 memcpy(v, ia4, l); 2364 return 0; 2365 } 2366 2367 /* 2368 * Set the IP6 multicast options in response to user setsockopt(). 2369 */ 2370 static int 2371 ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) 2372 { 2373 int error = 0; 2374 u_int loop, ifindex; 2375 struct ipv6_mreq mreq; 2376 struct in6_addr ia; 2377 struct ifnet *ifp; 2378 struct ip6_moptions *im6o = in6p->in6p_moptions; 2379 struct in6_multi_mship *imm; 2380 2381 if (im6o == NULL) { 2382 /* 2383 * No multicast option buffer attached to the pcb; 2384 * allocate one and initialize to default values. 2385 */ 2386 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2387 if (im6o == NULL) 2388 return (ENOBUFS); 2389 in6p->in6p_moptions = im6o; 2390 im6o->im6o_multicast_if_index = 0; 2391 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2392 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2393 LIST_INIT(&im6o->im6o_memberships); 2394 } 2395 2396 switch (sopt->sopt_name) { 2397 2398 case IPV6_MULTICAST_IF: 2399 /* 2400 * Select the interface for outgoing multicast packets. 2401 */ 2402 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2403 if (error != 0) 2404 break; 2405 2406 if (ifindex != 0) { 2407 if ((ifp = if_byindex(ifindex)) == NULL) { 2408 error = ENXIO; /* XXX EINVAL? */ 2409 break; 2410 } 2411 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2412 error = EADDRNOTAVAIL; 2413 break; 2414 } 2415 } else 2416 ifp = NULL; 2417 im6o->im6o_multicast_if_index = if_get_index(ifp); 2418 break; 2419 2420 case IPV6_MULTICAST_HOPS: 2421 { 2422 /* 2423 * Set the IP6 hoplimit for outgoing multicast packets. 2424 */ 2425 int optval; 2426 2427 error = sockopt_getint(sopt, &optval); 2428 if (error != 0) 2429 break; 2430 2431 if (optval < -1 || optval >= 256) 2432 error = EINVAL; 2433 else if (optval == -1) 2434 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2435 else 2436 im6o->im6o_multicast_hlim = optval; 2437 break; 2438 } 2439 2440 case IPV6_MULTICAST_LOOP: 2441 /* 2442 * Set the loopback flag for outgoing multicast packets. 2443 * Must be zero or one. 2444 */ 2445 error = sockopt_get(sopt, &loop, sizeof(loop)); 2446 if (error != 0) 2447 break; 2448 if (loop > 1) { 2449 error = EINVAL; 2450 break; 2451 } 2452 im6o->im6o_multicast_loop = loop; 2453 break; 2454 2455 case IPV6_JOIN_GROUP: 2456 /* 2457 * Add a multicast group membership. 2458 * Group must be a valid IP6 multicast address. 2459 */ 2460 if ((error = ip6_get_membership(sopt, &ifp, &ia, sizeof(ia)))) 2461 return error; 2462 2463 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2464 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2465 break; 2466 } 2467 /* 2468 * See if we found an interface, and confirm that it 2469 * supports multicast 2470 */ 2471 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2472 error = EADDRNOTAVAIL; 2473 break; 2474 } 2475 2476 if (in6_setscope(&ia, ifp, NULL)) { 2477 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2478 break; 2479 } 2480 2481 /* 2482 * See if the membership already exists. 2483 */ 2484 for (imm = im6o->im6o_memberships.lh_first; 2485 imm != NULL; imm = imm->i6mm_chain.le_next) 2486 if (imm->i6mm_maddr->in6m_ifp == ifp && 2487 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2488 &ia)) 2489 break; 2490 if (imm != NULL) { 2491 error = EADDRINUSE; 2492 break; 2493 } 2494 /* 2495 * Everything looks good; add a new record to the multicast 2496 * address list for the given interface. 2497 */ 2498 imm = in6_joingroup(ifp, &ia, &error, 0); 2499 if (imm == NULL) 2500 break; 2501 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2502 break; 2503 2504 case IPV6_LEAVE_GROUP: 2505 /* 2506 * Drop a multicast group membership. 2507 * Group must be a valid IP6 multicast address. 2508 */ 2509 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2510 if (error != 0) 2511 break; 2512 2513 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2514 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2515 break; 2516 } 2517 /* 2518 * If an interface address was specified, get a pointer 2519 * to its ifnet structure. 2520 */ 2521 if (mreq.ipv6mr_interface != 0) { 2522 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2523 error = ENXIO; /* XXX EINVAL? */ 2524 break; 2525 } 2526 } else 2527 ifp = NULL; 2528 2529 /* Fill in the scope zone ID */ 2530 if (ifp) { 2531 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2532 /* XXX: should not happen */ 2533 error = EADDRNOTAVAIL; 2534 break; 2535 } 2536 } else if (mreq.ipv6mr_interface != 0) { 2537 /* 2538 * XXX: This case would happens when the (positive) 2539 * index is in the valid range, but the corresponding 2540 * interface has been detached dynamically. The above 2541 * check probably avoids such case to happen here, but 2542 * we check it explicitly for safety. 2543 */ 2544 error = EADDRNOTAVAIL; 2545 break; 2546 } else { /* ipv6mr_interface == 0 */ 2547 struct sockaddr_in6 sa6_mc; 2548 2549 /* 2550 * The API spec says as follows: 2551 * If the interface index is specified as 0, the 2552 * system may choose a multicast group membership to 2553 * drop by matching the multicast address only. 2554 * On the other hand, we cannot disambiguate the scope 2555 * zone unless an interface is provided. Thus, we 2556 * check if there's ambiguity with the default scope 2557 * zone as the last resort. 2558 */ 2559 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2560 0, 0, 0); 2561 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2562 if (error != 0) 2563 break; 2564 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2565 } 2566 2567 /* 2568 * Find the membership in the membership list. 2569 */ 2570 for (imm = im6o->im6o_memberships.lh_first; 2571 imm != NULL; imm = imm->i6mm_chain.le_next) { 2572 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2573 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2574 &mreq.ipv6mr_multiaddr)) 2575 break; 2576 } 2577 if (imm == NULL) { 2578 /* Unable to resolve interface */ 2579 error = EADDRNOTAVAIL; 2580 break; 2581 } 2582 /* 2583 * Give up the multicast address record to which the 2584 * membership points. 2585 */ 2586 LIST_REMOVE(imm, i6mm_chain); 2587 in6_leavegroup(imm); 2588 break; 2589 2590 default: 2591 error = EOPNOTSUPP; 2592 break; 2593 } 2594 2595 /* 2596 * If all options have default values, no need to keep the mbuf. 2597 */ 2598 if (im6o->im6o_multicast_if_index == 0 && 2599 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2600 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2601 im6o->im6o_memberships.lh_first == NULL) { 2602 free(in6p->in6p_moptions, M_IPMOPTS); 2603 in6p->in6p_moptions = NULL; 2604 } 2605 2606 return (error); 2607 } 2608 2609 /* 2610 * Return the IP6 multicast options in response to user getsockopt(). 2611 */ 2612 static int 2613 ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p) 2614 { 2615 u_int optval; 2616 int error; 2617 struct ip6_moptions *im6o = in6p->in6p_moptions; 2618 2619 switch (sopt->sopt_name) { 2620 case IPV6_MULTICAST_IF: 2621 if (im6o == NULL || im6o->im6o_multicast_if_index == 0) 2622 optval = 0; 2623 else 2624 optval = im6o->im6o_multicast_if_index; 2625 2626 error = sockopt_set(sopt, &optval, sizeof(optval)); 2627 break; 2628 2629 case IPV6_MULTICAST_HOPS: 2630 if (im6o == NULL) 2631 optval = ip6_defmcasthlim; 2632 else 2633 optval = im6o->im6o_multicast_hlim; 2634 2635 error = sockopt_set(sopt, &optval, sizeof(optval)); 2636 break; 2637 2638 case IPV6_MULTICAST_LOOP: 2639 if (im6o == NULL) 2640 optval = IPV6_DEFAULT_MULTICAST_LOOP; 2641 else 2642 optval = im6o->im6o_multicast_loop; 2643 2644 error = sockopt_set(sopt, &optval, sizeof(optval)); 2645 break; 2646 2647 default: 2648 error = EOPNOTSUPP; 2649 } 2650 2651 return (error); 2652 } 2653 2654 /* 2655 * Discard the IP6 multicast options. 2656 */ 2657 void 2658 ip6_freemoptions(struct ip6_moptions *im6o) 2659 { 2660 struct in6_multi_mship *imm; 2661 2662 if (im6o == NULL) 2663 return; 2664 2665 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2666 LIST_REMOVE(imm, i6mm_chain); 2667 in6_leavegroup(imm); 2668 } 2669 free(im6o, M_IPMOPTS); 2670 } 2671 2672 /* 2673 * Set IPv6 outgoing packet options based on advanced API. 2674 */ 2675 int 2676 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2677 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2678 { 2679 struct cmsghdr *cm = 0; 2680 2681 if (control == NULL || opt == NULL) 2682 return (EINVAL); 2683 2684 ip6_initpktopts(opt); 2685 if (stickyopt) { 2686 int error; 2687 2688 /* 2689 * If stickyopt is provided, make a local copy of the options 2690 * for this particular packet, then override them by ancillary 2691 * objects. 2692 * XXX: copypktopts() does not copy the cached route to a next 2693 * hop (if any). This is not very good in terms of efficiency, 2694 * but we can allow this since this option should be rarely 2695 * used. 2696 */ 2697 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2698 return (error); 2699 } 2700 2701 /* 2702 * XXX: Currently, we assume all the optional information is stored 2703 * in a single mbuf. 2704 */ 2705 if (control->m_next) 2706 return (EINVAL); 2707 2708 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2709 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2710 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2711 int error; 2712 2713 if (control->m_len < CMSG_LEN(0)) 2714 return (EINVAL); 2715 2716 cm = mtod(control, struct cmsghdr *); 2717 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2718 return (EINVAL); 2719 if (cm->cmsg_level != IPPROTO_IPV6) 2720 continue; 2721 2722 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2723 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2724 if (error) 2725 return (error); 2726 } 2727 2728 return (0); 2729 } 2730 2731 /* 2732 * Set a particular packet option, as a sticky option or an ancillary data 2733 * item. "len" can be 0 only when it's a sticky option. 2734 * We have 4 cases of combination of "sticky" and "cmsg": 2735 * "sticky=0, cmsg=0": impossible 2736 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2737 * "sticky=1, cmsg=0": RFC3542 socket option 2738 * "sticky=1, cmsg=1": RFC2292 socket option 2739 */ 2740 static int 2741 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2742 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2743 { 2744 int minmtupolicy; 2745 int error; 2746 2747 if (!sticky && !cmsg) { 2748 #ifdef DIAGNOSTIC 2749 printf("ip6_setpktopt: impossible case\n"); 2750 #endif 2751 return (EINVAL); 2752 } 2753 2754 /* 2755 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2756 * not be specified in the context of RFC3542. Conversely, 2757 * RFC3542 types should not be specified in the context of RFC2292. 2758 */ 2759 if (!cmsg) { 2760 switch (optname) { 2761 case IPV6_2292PKTINFO: 2762 case IPV6_2292HOPLIMIT: 2763 case IPV6_2292NEXTHOP: 2764 case IPV6_2292HOPOPTS: 2765 case IPV6_2292DSTOPTS: 2766 case IPV6_2292RTHDR: 2767 case IPV6_2292PKTOPTIONS: 2768 return (ENOPROTOOPT); 2769 } 2770 } 2771 if (sticky && cmsg) { 2772 switch (optname) { 2773 case IPV6_PKTINFO: 2774 case IPV6_HOPLIMIT: 2775 case IPV6_NEXTHOP: 2776 case IPV6_HOPOPTS: 2777 case IPV6_DSTOPTS: 2778 case IPV6_RTHDRDSTOPTS: 2779 case IPV6_RTHDR: 2780 case IPV6_USE_MIN_MTU: 2781 case IPV6_DONTFRAG: 2782 case IPV6_OTCLASS: 2783 case IPV6_TCLASS: 2784 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2785 return (ENOPROTOOPT); 2786 } 2787 } 2788 2789 switch (optname) { 2790 #ifdef RFC2292 2791 case IPV6_2292PKTINFO: 2792 #endif 2793 case IPV6_PKTINFO: 2794 { 2795 struct in6_pktinfo *pktinfo; 2796 2797 if (len != sizeof(struct in6_pktinfo)) 2798 return (EINVAL); 2799 2800 pktinfo = (struct in6_pktinfo *)buf; 2801 2802 /* 2803 * An application can clear any sticky IPV6_PKTINFO option by 2804 * doing a "regular" setsockopt with ipi6_addr being 2805 * in6addr_any and ipi6_ifindex being zero. 2806 * [RFC 3542, Section 6] 2807 */ 2808 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2809 pktinfo->ipi6_ifindex == 0 && 2810 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2811 ip6_clearpktopts(opt, optname); 2812 break; 2813 } 2814 2815 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2816 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2817 return (EINVAL); 2818 } 2819 2820 /* Validate the interface index if specified. */ 2821 if (pktinfo->ipi6_ifindex) { 2822 struct ifnet *ifp; 2823 int s = pserialize_read_enter(); 2824 ifp = if_byindex(pktinfo->ipi6_ifindex); 2825 if (ifp == NULL) { 2826 pserialize_read_exit(s); 2827 return ENXIO; 2828 } 2829 pserialize_read_exit(s); 2830 } 2831 2832 /* 2833 * We store the address anyway, and let in6_selectsrc() 2834 * validate the specified address. This is because ipi6_addr 2835 * may not have enough information about its scope zone, and 2836 * we may need additional information (such as outgoing 2837 * interface or the scope zone of a destination address) to 2838 * disambiguate the scope. 2839 * XXX: the delay of the validation may confuse the 2840 * application when it is used as a sticky option. 2841 */ 2842 if (opt->ip6po_pktinfo == NULL) { 2843 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2844 M_IP6OPT, M_NOWAIT); 2845 if (opt->ip6po_pktinfo == NULL) 2846 return (ENOBUFS); 2847 } 2848 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2849 break; 2850 } 2851 2852 #ifdef RFC2292 2853 case IPV6_2292HOPLIMIT: 2854 #endif 2855 case IPV6_HOPLIMIT: 2856 { 2857 int *hlimp; 2858 2859 /* 2860 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2861 * to simplify the ordering among hoplimit options. 2862 */ 2863 if (optname == IPV6_HOPLIMIT && sticky) 2864 return (ENOPROTOOPT); 2865 2866 if (len != sizeof(int)) 2867 return (EINVAL); 2868 hlimp = (int *)buf; 2869 if (*hlimp < -1 || *hlimp > 255) 2870 return (EINVAL); 2871 2872 opt->ip6po_hlim = *hlimp; 2873 break; 2874 } 2875 2876 case IPV6_OTCLASS: 2877 if (len != sizeof(u_int8_t)) 2878 return (EINVAL); 2879 2880 opt->ip6po_tclass = *(u_int8_t *)buf; 2881 break; 2882 2883 case IPV6_TCLASS: 2884 { 2885 int tclass; 2886 2887 if (len != sizeof(int)) 2888 return (EINVAL); 2889 tclass = *(int *)buf; 2890 if (tclass < -1 || tclass > 255) 2891 return (EINVAL); 2892 2893 opt->ip6po_tclass = tclass; 2894 break; 2895 } 2896 2897 #ifdef RFC2292 2898 case IPV6_2292NEXTHOP: 2899 #endif 2900 case IPV6_NEXTHOP: 2901 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2902 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2903 if (error) 2904 return (error); 2905 2906 if (len == 0) { /* just remove the option */ 2907 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2908 break; 2909 } 2910 2911 /* check if cmsg_len is large enough for sa_len */ 2912 if (len < sizeof(struct sockaddr) || len < *buf) 2913 return (EINVAL); 2914 2915 switch (((struct sockaddr *)buf)->sa_family) { 2916 case AF_INET6: 2917 { 2918 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2919 2920 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2921 return (EINVAL); 2922 2923 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2924 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2925 return (EINVAL); 2926 } 2927 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 2928 != 0) { 2929 return (error); 2930 } 2931 break; 2932 } 2933 case AF_LINK: /* eventually be supported? */ 2934 default: 2935 return (EAFNOSUPPORT); 2936 } 2937 2938 /* turn off the previous option, then set the new option. */ 2939 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2940 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2941 if (opt->ip6po_nexthop == NULL) 2942 return (ENOBUFS); 2943 memcpy(opt->ip6po_nexthop, buf, *buf); 2944 break; 2945 2946 #ifdef RFC2292 2947 case IPV6_2292HOPOPTS: 2948 #endif 2949 case IPV6_HOPOPTS: 2950 { 2951 struct ip6_hbh *hbh; 2952 int hbhlen; 2953 2954 /* 2955 * XXX: We don't allow a non-privileged user to set ANY HbH 2956 * options, since per-option restriction has too much 2957 * overhead. 2958 */ 2959 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2960 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2961 if (error) 2962 return (error); 2963 2964 if (len == 0) { 2965 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2966 break; /* just remove the option */ 2967 } 2968 2969 /* message length validation */ 2970 if (len < sizeof(struct ip6_hbh)) 2971 return (EINVAL); 2972 hbh = (struct ip6_hbh *)buf; 2973 hbhlen = (hbh->ip6h_len + 1) << 3; 2974 if (len != hbhlen) 2975 return (EINVAL); 2976 2977 /* turn off the previous option, then set the new option. */ 2978 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2979 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2980 if (opt->ip6po_hbh == NULL) 2981 return (ENOBUFS); 2982 memcpy(opt->ip6po_hbh, hbh, hbhlen); 2983 2984 break; 2985 } 2986 2987 #ifdef RFC2292 2988 case IPV6_2292DSTOPTS: 2989 #endif 2990 case IPV6_DSTOPTS: 2991 case IPV6_RTHDRDSTOPTS: 2992 { 2993 struct ip6_dest *dest, **newdest = NULL; 2994 int destlen; 2995 2996 /* XXX: see the comment for IPV6_HOPOPTS */ 2997 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2998 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2999 if (error) 3000 return (error); 3001 3002 if (len == 0) { 3003 ip6_clearpktopts(opt, optname); 3004 break; /* just remove the option */ 3005 } 3006 3007 /* message length validation */ 3008 if (len < sizeof(struct ip6_dest)) 3009 return (EINVAL); 3010 dest = (struct ip6_dest *)buf; 3011 destlen = (dest->ip6d_len + 1) << 3; 3012 if (len != destlen) 3013 return (EINVAL); 3014 /* 3015 * Determine the position that the destination options header 3016 * should be inserted; before or after the routing header. 3017 */ 3018 switch (optname) { 3019 case IPV6_2292DSTOPTS: 3020 /* 3021 * The old advanced API is ambiguous on this point. 3022 * Our approach is to determine the position based 3023 * according to the existence of a routing header. 3024 * Note, however, that this depends on the order of the 3025 * extension headers in the ancillary data; the 1st 3026 * part of the destination options header must appear 3027 * before the routing header in the ancillary data, 3028 * too. 3029 * RFC3542 solved the ambiguity by introducing 3030 * separate ancillary data or option types. 3031 */ 3032 if (opt->ip6po_rthdr == NULL) 3033 newdest = &opt->ip6po_dest1; 3034 else 3035 newdest = &opt->ip6po_dest2; 3036 break; 3037 case IPV6_RTHDRDSTOPTS: 3038 newdest = &opt->ip6po_dest1; 3039 break; 3040 case IPV6_DSTOPTS: 3041 newdest = &opt->ip6po_dest2; 3042 break; 3043 } 3044 3045 /* turn off the previous option, then set the new option. */ 3046 ip6_clearpktopts(opt, optname); 3047 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3048 if (*newdest == NULL) 3049 return (ENOBUFS); 3050 memcpy(*newdest, dest, destlen); 3051 3052 break; 3053 } 3054 3055 #ifdef RFC2292 3056 case IPV6_2292RTHDR: 3057 #endif 3058 case IPV6_RTHDR: 3059 { 3060 struct ip6_rthdr *rth; 3061 int rthlen; 3062 3063 if (len == 0) { 3064 ip6_clearpktopts(opt, IPV6_RTHDR); 3065 break; /* just remove the option */ 3066 } 3067 3068 /* message length validation */ 3069 if (len < sizeof(struct ip6_rthdr)) 3070 return (EINVAL); 3071 rth = (struct ip6_rthdr *)buf; 3072 rthlen = (rth->ip6r_len + 1) << 3; 3073 if (len != rthlen) 3074 return (EINVAL); 3075 switch (rth->ip6r_type) { 3076 case IPV6_RTHDR_TYPE_0: 3077 if (rth->ip6r_len == 0) /* must contain one addr */ 3078 return (EINVAL); 3079 if (rth->ip6r_len % 2) /* length must be even */ 3080 return (EINVAL); 3081 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3082 return (EINVAL); 3083 break; 3084 default: 3085 return (EINVAL); /* not supported */ 3086 } 3087 /* turn off the previous option */ 3088 ip6_clearpktopts(opt, IPV6_RTHDR); 3089 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3090 if (opt->ip6po_rthdr == NULL) 3091 return (ENOBUFS); 3092 memcpy(opt->ip6po_rthdr, rth, rthlen); 3093 break; 3094 } 3095 3096 case IPV6_USE_MIN_MTU: 3097 if (len != sizeof(int)) 3098 return (EINVAL); 3099 minmtupolicy = *(int *)buf; 3100 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3101 minmtupolicy != IP6PO_MINMTU_DISABLE && 3102 minmtupolicy != IP6PO_MINMTU_ALL) { 3103 return (EINVAL); 3104 } 3105 opt->ip6po_minmtu = minmtupolicy; 3106 break; 3107 3108 case IPV6_DONTFRAG: 3109 if (len != sizeof(int)) 3110 return (EINVAL); 3111 3112 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3113 /* 3114 * we ignore this option for TCP sockets. 3115 * (RFC3542 leaves this case unspecified.) 3116 */ 3117 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3118 } else 3119 opt->ip6po_flags |= IP6PO_DONTFRAG; 3120 break; 3121 3122 case IPV6_PREFER_TEMPADDR: 3123 { 3124 int preftemp; 3125 3126 if (len != sizeof(int)) 3127 return (EINVAL); 3128 preftemp = *(int *)buf; 3129 switch (preftemp) { 3130 case IP6PO_TEMPADDR_SYSTEM: 3131 case IP6PO_TEMPADDR_NOTPREFER: 3132 case IP6PO_TEMPADDR_PREFER: 3133 break; 3134 default: 3135 return (EINVAL); 3136 } 3137 opt->ip6po_prefer_tempaddr = preftemp; 3138 break; 3139 } 3140 3141 default: 3142 return (ENOPROTOOPT); 3143 } /* end of switch */ 3144 3145 return (0); 3146 } 3147 3148 /* 3149 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3150 * packet to the input queue of a specified interface. Note that this 3151 * calls the output routine of the loopback "driver", but with an interface 3152 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3153 */ 3154 void 3155 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3156 const struct sockaddr_in6 *dst) 3157 { 3158 struct mbuf *copym; 3159 struct ip6_hdr *ip6; 3160 3161 copym = m_copy(m, 0, M_COPYALL); 3162 if (copym == NULL) 3163 return; 3164 3165 /* 3166 * Make sure to deep-copy IPv6 header portion in case the data 3167 * is in an mbuf cluster, so that we can safely override the IPv6 3168 * header portion later. 3169 */ 3170 if ((copym->m_flags & M_EXT) != 0 || 3171 copym->m_len < sizeof(struct ip6_hdr)) { 3172 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3173 if (copym == NULL) 3174 return; 3175 } 3176 3177 #ifdef DIAGNOSTIC 3178 if (copym->m_len < sizeof(*ip6)) { 3179 m_freem(copym); 3180 return; 3181 } 3182 #endif 3183 3184 ip6 = mtod(copym, struct ip6_hdr *); 3185 /* 3186 * clear embedded scope identifiers if necessary. 3187 * in6_clearscope will touch the addresses only when necessary. 3188 */ 3189 in6_clearscope(&ip6->ip6_src); 3190 in6_clearscope(&ip6->ip6_dst); 3191 3192 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3193 } 3194 3195 /* 3196 * Chop IPv6 header off from the payload. 3197 */ 3198 static int 3199 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3200 { 3201 struct mbuf *mh; 3202 struct ip6_hdr *ip6; 3203 3204 ip6 = mtod(m, struct ip6_hdr *); 3205 if (m->m_len > sizeof(*ip6)) { 3206 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3207 if (mh == 0) { 3208 m_freem(m); 3209 return ENOBUFS; 3210 } 3211 M_MOVE_PKTHDR(mh, m); 3212 MH_ALIGN(mh, sizeof(*ip6)); 3213 m->m_len -= sizeof(*ip6); 3214 m->m_data += sizeof(*ip6); 3215 mh->m_next = m; 3216 m = mh; 3217 m->m_len = sizeof(*ip6); 3218 bcopy((void *)ip6, mtod(m, void *), sizeof(*ip6)); 3219 } 3220 exthdrs->ip6e_ip6 = m; 3221 return 0; 3222 } 3223 3224 /* 3225 * Compute IPv6 extension header length. 3226 */ 3227 int 3228 ip6_optlen(struct in6pcb *in6p) 3229 { 3230 int len; 3231 3232 if (!in6p->in6p_outputopts) 3233 return 0; 3234 3235 len = 0; 3236 #define elen(x) \ 3237 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3238 3239 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3240 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3241 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3242 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3243 return len; 3244 #undef elen 3245 } 3246
Indexes created Wed Sep 24 05:09:52 GMT 2025