ip6_output.c revision 1.226.2.1
1 /* $NetBSD: ip6_output.c,v 1.226.2.1 2021/04/03 22:29:02 thorpej 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 1.226.2.1 2021/04/03 22:29:02 thorpej 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/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/syslog.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 #endif 108 109 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 110 111 struct ip6_exthdrs { 112 struct mbuf *ip6e_ip6; 113 struct mbuf *ip6e_hbh; 114 struct mbuf *ip6e_dest1; 115 struct mbuf *ip6e_rthdr; 116 struct mbuf *ip6e_dest2; 117 }; 118 119 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 120 kauth_cred_t, int); 121 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 122 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, kauth_cred_t, 123 int, int, int); 124 static int ip6_setmoptions(const struct sockopt *, struct in6pcb *); 125 static int ip6_getmoptions(struct sockopt *, struct in6pcb *); 126 static int ip6_copyexthdr(struct mbuf **, void *, int); 127 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 128 struct ip6_frag **); 129 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 130 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 131 static int ip6_getpmtu(struct rtentry *, struct ifnet *, u_long *, int *); 132 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 133 static int ip6_ifaddrvalid(const struct in6_addr *, const struct in6_addr *); 134 static int ip6_handle_rthdr(struct ip6_rthdr *, struct ip6_hdr *); 135 136 #ifdef RFC2292 137 static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *); 138 #endif 139 140 static int 141 ip6_handle_rthdr(struct ip6_rthdr *rh, struct ip6_hdr *ip6) 142 { 143 int error = 0; 144 145 switch (rh->ip6r_type) { 146 case IPV6_RTHDR_TYPE_0: 147 /* Dropped, RFC5095. */ 148 default: /* is it possible? */ 149 error = EINVAL; 150 } 151 152 return error; 153 } 154 155 /* 156 * Send an IP packet to a host. 157 */ 158 int 159 ip6_if_output(struct ifnet * const ifp, struct ifnet * const origifp, 160 struct mbuf * const m, const struct sockaddr_in6 * const dst, 161 const struct rtentry *rt) 162 { 163 int error = 0; 164 165 if (rt != NULL) { 166 error = rt_check_reject_route(rt, ifp); 167 if (error != 0) { 168 IP6_STATINC(IP6_STAT_RTREJECT); 169 m_freem(m); 170 return error; 171 } 172 } 173 174 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 175 error = if_output_lock(ifp, origifp, m, sin6tocsa(dst), rt); 176 else 177 error = if_output_lock(ifp, ifp, m, sin6tocsa(dst), rt); 178 return error; 179 } 180 181 /* 182 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 183 * header (with pri, len, nxt, hlim, src, dst). 184 * 185 * This function may modify ver and hlim only. The mbuf chain containing the 186 * packet will be freed. The mbuf opt, if present, will not be freed. 187 * 188 * Type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 189 * nd_ifinfo.linkmtu is u_int32_t. So we use u_long to hold largest one, 190 * which is rt_rmx.rmx_mtu. 191 */ 192 int 193 ip6_output( 194 struct mbuf *m0, 195 struct ip6_pktopts *opt, 196 struct route *ro, 197 int flags, 198 struct ip6_moptions *im6o, 199 struct in6pcb *in6p, 200 struct ifnet **ifpp /* XXX: just for statistics */ 201 ) 202 { 203 struct ip6_hdr *ip6, *mhip6; 204 struct ifnet *ifp = NULL, *origifp = NULL; 205 struct mbuf *m = m0; 206 int tlen, len, off; 207 bool tso; 208 struct route ip6route; 209 struct rtentry *rt = NULL, *rt_pmtu; 210 const struct sockaddr_in6 *dst; 211 struct sockaddr_in6 src_sa, dst_sa; 212 int error = 0; 213 struct in6_ifaddr *ia = NULL; 214 u_long mtu; 215 int alwaysfrag, dontfrag; 216 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 217 struct ip6_exthdrs exthdrs; 218 struct in6_addr finaldst, src0, dst0; 219 u_int32_t zone; 220 struct route *ro_pmtu = NULL; 221 int hdrsplit = 0; 222 int needipsec = 0; 223 #ifdef IPSEC 224 struct secpolicy *sp = NULL; 225 #endif 226 struct psref psref, psref_ia; 227 int bound = curlwp_bind(); 228 bool release_psref_ia = false; 229 230 #ifdef DIAGNOSTIC 231 if ((m->m_flags & M_PKTHDR) == 0) 232 panic("ip6_output: no HDR"); 233 if ((m->m_pkthdr.csum_flags & 234 (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { 235 panic("ip6_output: IPv4 checksum offload flags: %d", 236 m->m_pkthdr.csum_flags); 237 } 238 if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 239 (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 240 panic("ip6_output: conflicting checksum offload flags: %d", 241 m->m_pkthdr.csum_flags); 242 } 243 #endif 244 245 M_CSUM_DATA_IPv6_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 246 247 #define MAKE_EXTHDR(hp, mp) \ 248 do { \ 249 if (hp) { \ 250 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 251 error = ip6_copyexthdr((mp), (void *)(hp), \ 252 ((eh)->ip6e_len + 1) << 3); \ 253 if (error) \ 254 goto freehdrs; \ 255 } \ 256 } while (/*CONSTCOND*/ 0) 257 258 memset(&exthdrs, 0, sizeof(exthdrs)); 259 if (opt) { 260 /* Hop-by-Hop options header */ 261 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 262 /* Destination options header (1st part) */ 263 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 264 /* Routing header */ 265 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 266 /* Destination options header (2nd part) */ 267 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 268 } 269 270 /* 271 * Calculate the total length of the extension header chain. 272 * Keep the length of the unfragmentable part for fragmentation. 273 */ 274 optlen = 0; 275 if (exthdrs.ip6e_hbh) 276 optlen += exthdrs.ip6e_hbh->m_len; 277 if (exthdrs.ip6e_dest1) 278 optlen += exthdrs.ip6e_dest1->m_len; 279 if (exthdrs.ip6e_rthdr) 280 optlen += exthdrs.ip6e_rthdr->m_len; 281 unfragpartlen = optlen + sizeof(struct ip6_hdr); 282 /* NOTE: we don't add AH/ESP length here. do that later. */ 283 if (exthdrs.ip6e_dest2) 284 optlen += exthdrs.ip6e_dest2->m_len; 285 286 #ifdef IPSEC 287 if (ipsec_used) { 288 /* Check the security policy (SP) for the packet */ 289 sp = ipsec6_check_policy(m, in6p, flags, &needipsec, &error); 290 if (error != 0) { 291 /* 292 * Hack: -EINVAL is used to signal that a packet 293 * should be silently discarded. This is typically 294 * because we asked key management for an SA and 295 * it was delayed (e.g. kicked up to IKE). 296 */ 297 if (error == -EINVAL) 298 error = 0; 299 IP6_STATINC(IP6_STAT_IPSECDROP_OUT); 300 goto freehdrs; 301 } 302 } 303 #endif 304 305 if (needipsec && 306 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 307 in6_undefer_cksum_tcpudp(m); 308 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 309 } 310 311 /* 312 * If we need IPsec, or there is at least one extension header, 313 * separate IP6 header from the payload. 314 */ 315 if ((needipsec || optlen) && !hdrsplit) { 316 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 317 IP6_STATINC(IP6_STAT_ODROPPED); 318 m = NULL; 319 goto freehdrs; 320 } 321 m = exthdrs.ip6e_ip6; 322 hdrsplit++; 323 } 324 325 /* adjust pointer */ 326 ip6 = mtod(m, struct ip6_hdr *); 327 328 /* adjust mbuf packet header length */ 329 m->m_pkthdr.len += optlen; 330 plen = m->m_pkthdr.len - sizeof(*ip6); 331 332 /* If this is a jumbo payload, insert a jumbo payload option. */ 333 if (plen > IPV6_MAXPACKET) { 334 if (!hdrsplit) { 335 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 336 IP6_STATINC(IP6_STAT_ODROPPED); 337 m = NULL; 338 goto freehdrs; 339 } 340 m = exthdrs.ip6e_ip6; 341 hdrsplit++; 342 } 343 /* adjust pointer */ 344 ip6 = mtod(m, struct ip6_hdr *); 345 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) { 346 IP6_STATINC(IP6_STAT_ODROPPED); 347 goto freehdrs; 348 } 349 optlen += 8; /* XXX JUMBOOPTLEN */ 350 ip6->ip6_plen = 0; 351 } else 352 ip6->ip6_plen = htons(plen); 353 354 /* 355 * Concatenate headers and fill in next header fields. 356 * Here we have, on "m" 357 * IPv6 payload 358 * and we insert headers accordingly. Finally, we should be getting: 359 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 360 * 361 * during the header composing process, "m" points to IPv6 header. 362 * "mprev" points to an extension header prior to esp. 363 */ 364 { 365 u_char *nexthdrp = &ip6->ip6_nxt; 366 struct mbuf *mprev = m; 367 368 /* 369 * we treat dest2 specially. this makes IPsec processing 370 * much easier. the goal here is to make mprev point the 371 * mbuf prior to dest2. 372 * 373 * result: IPv6 dest2 payload 374 * m and mprev will point to IPv6 header. 375 */ 376 if (exthdrs.ip6e_dest2) { 377 if (!hdrsplit) 378 panic("assumption failed: hdr not split"); 379 exthdrs.ip6e_dest2->m_next = m->m_next; 380 m->m_next = exthdrs.ip6e_dest2; 381 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 382 ip6->ip6_nxt = IPPROTO_DSTOPTS; 383 } 384 385 #define MAKE_CHAIN(m, mp, p, i)\ 386 do {\ 387 if (m) {\ 388 if (!hdrsplit) \ 389 panic("assumption failed: hdr not split"); \ 390 *mtod((m), u_char *) = *(p);\ 391 *(p) = (i);\ 392 p = mtod((m), u_char *);\ 393 (m)->m_next = (mp)->m_next;\ 394 (mp)->m_next = (m);\ 395 (mp) = (m);\ 396 }\ 397 } while (/*CONSTCOND*/ 0) 398 /* 399 * result: IPv6 hbh dest1 rthdr dest2 payload 400 * m will point to IPv6 header. mprev will point to the 401 * extension header prior to dest2 (rthdr in the above case). 402 */ 403 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 404 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 405 IPPROTO_DSTOPTS); 406 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 407 IPPROTO_ROUTING); 408 409 M_CSUM_DATA_IPv6_SET(m->m_pkthdr.csum_data, 410 sizeof(struct ip6_hdr) + optlen); 411 } 412 413 /* Need to save for pmtu */ 414 finaldst = ip6->ip6_dst; 415 416 /* 417 * If there is a routing header, replace destination address field 418 * with the first hop of the routing header. 419 */ 420 if (exthdrs.ip6e_rthdr) { 421 struct ip6_rthdr *rh; 422 423 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 424 425 error = ip6_handle_rthdr(rh, ip6); 426 if (error != 0) { 427 IP6_STATINC(IP6_STAT_ODROPPED); 428 goto bad; 429 } 430 } 431 432 /* Source address validation */ 433 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 434 (flags & IPV6_UNSPECSRC) == 0) { 435 error = EOPNOTSUPP; 436 IP6_STATINC(IP6_STAT_BADSCOPE); 437 goto bad; 438 } 439 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 440 error = EOPNOTSUPP; 441 IP6_STATINC(IP6_STAT_BADSCOPE); 442 goto bad; 443 } 444 445 IP6_STATINC(IP6_STAT_LOCALOUT); 446 447 /* 448 * Route packet. 449 */ 450 /* initialize cached route */ 451 if (ro == NULL) { 452 memset(&ip6route, 0, sizeof(ip6route)); 453 ro = &ip6route; 454 } 455 ro_pmtu = ro; 456 if (opt && opt->ip6po_rthdr) 457 ro = &opt->ip6po_route; 458 459 /* 460 * if specified, try to fill in the traffic class field. 461 * do not override if a non-zero value is already set. 462 * we check the diffserv field and the ecn field separately. 463 */ 464 if (opt && opt->ip6po_tclass >= 0) { 465 int mask = 0; 466 467 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 468 mask |= 0xfc; 469 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 470 mask |= 0x03; 471 if (mask != 0) 472 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 473 } 474 475 /* fill in or override the hop limit field, if necessary. */ 476 if (opt && opt->ip6po_hlim != -1) 477 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 478 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 479 if (im6o != NULL) 480 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 481 else 482 ip6->ip6_hlim = ip6_defmcasthlim; 483 } 484 485 #ifdef IPSEC 486 if (needipsec) { 487 int s = splsoftnet(); 488 error = ipsec6_process_packet(m, sp->req, flags); 489 splx(s); 490 491 /* 492 * Preserve KAME behaviour: ENOENT can be returned 493 * when an SA acquire is in progress. Don't propagate 494 * this to user-level; it confuses applications. 495 * XXX this will go away when the SADB is redone. 496 */ 497 if (error == ENOENT) 498 error = 0; 499 500 goto done; 501 } 502 #endif 503 504 /* adjust pointer */ 505 ip6 = mtod(m, struct ip6_hdr *); 506 507 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 508 509 /* We do not need a route for multicast */ 510 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 511 struct in6_pktinfo *pi = NULL; 512 513 /* 514 * If the outgoing interface for the address is specified by 515 * the caller, use it. 516 */ 517 if (opt && (pi = opt->ip6po_pktinfo) != NULL) { 518 /* XXX boundary check is assumed to be already done. */ 519 ifp = if_get_byindex(pi->ipi6_ifindex, &psref); 520 } else if (im6o != NULL) { 521 ifp = if_get_byindex(im6o->im6o_multicast_if_index, 522 &psref); 523 } 524 } 525 526 if (ifp == NULL) { 527 error = in6_selectroute(&dst_sa, opt, &ro, &rt, true); 528 if (error != 0) 529 goto bad; 530 ifp = if_get_byindex(rt->rt_ifp->if_index, &psref); 531 } 532 533 if (rt == NULL) { 534 /* 535 * If in6_selectroute() does not return a route entry, 536 * dst may not have been updated. 537 */ 538 error = rtcache_setdst(ro, sin6tosa(&dst_sa)); 539 if (error) { 540 IP6_STATINC(IP6_STAT_ODROPPED); 541 goto bad; 542 } 543 } 544 545 /* 546 * then rt (for unicast) and ifp must be non-NULL valid values. 547 */ 548 if ((flags & IPV6_FORWARDING) == 0) { 549 /* XXX: the FORWARDING flag can be set for mrouting. */ 550 in6_ifstat_inc(ifp, ifs6_out_request); 551 } 552 if (rt != NULL) { 553 ia = (struct in6_ifaddr *)(rt->rt_ifa); 554 rt->rt_use++; 555 } 556 557 /* 558 * The outgoing interface must be in the zone of source and 559 * destination addresses. We should use ia_ifp to support the 560 * case of sending packets to an address of our own. 561 */ 562 if (ia != NULL) { 563 origifp = ia->ia_ifp; 564 if (if_is_deactivated(origifp)) { 565 IP6_STATINC(IP6_STAT_ODROPPED); 566 goto bad; 567 } 568 if_acquire(origifp, &psref_ia); 569 release_psref_ia = true; 570 } else 571 origifp = ifp; 572 573 src0 = ip6->ip6_src; 574 if (in6_setscope(&src0, origifp, &zone)) 575 goto badscope; 576 sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); 577 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 578 goto badscope; 579 580 dst0 = ip6->ip6_dst; 581 if (in6_setscope(&dst0, origifp, &zone)) 582 goto badscope; 583 /* re-initialize to be sure */ 584 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 585 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 586 goto badscope; 587 588 /* scope check is done. */ 589 590 /* Ensure we only send from a valid address. */ 591 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 592 (flags & IPV6_FORWARDING) == 0 && 593 (error = ip6_ifaddrvalid(&src0, &dst0)) != 0) 594 { 595 char ip6buf[INET6_ADDRSTRLEN]; 596 nd6log(LOG_ERR, 597 "refusing to send from invalid address %s (pid %d)\n", 598 IN6_PRINT(ip6buf, &src0), curproc->p_pid); 599 IP6_STATINC(IP6_STAT_ODROPPED); 600 in6_ifstat_inc(origifp, ifs6_out_discard); 601 if (error == 1) 602 /* 603 * Address exists, but is tentative or detached. 604 * We can't send from it because it's invalid, 605 * so we drop the packet. 606 */ 607 error = 0; 608 else 609 error = EADDRNOTAVAIL; 610 goto bad; 611 } 612 613 if (rt != NULL && (rt->rt_flags & RTF_GATEWAY) && 614 !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 615 dst = satocsin6(rt->rt_gateway); 616 else 617 dst = satocsin6(rtcache_getdst(ro)); 618 619 /* 620 * XXXXXX: original code follows: 621 */ 622 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 623 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 624 else { 625 bool ingroup; 626 627 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 628 629 in6_ifstat_inc(ifp, ifs6_out_mcast); 630 631 /* 632 * Confirm that the outgoing interface supports multicast. 633 */ 634 if (!(ifp->if_flags & IFF_MULTICAST)) { 635 IP6_STATINC(IP6_STAT_NOROUTE); 636 in6_ifstat_inc(ifp, ifs6_out_discard); 637 error = ENETUNREACH; 638 goto bad; 639 } 640 641 ingroup = in6_multi_group(&ip6->ip6_dst, ifp); 642 if (ingroup && (im6o == NULL || im6o->im6o_multicast_loop)) { 643 /* 644 * If we belong to the destination multicast group 645 * on the outgoing interface, and the caller did not 646 * forbid loopback, loop back a copy. 647 */ 648 KASSERT(dst != NULL); 649 ip6_mloopback(ifp, m, dst); 650 } else { 651 /* 652 * If we are acting as a multicast router, perform 653 * multicast forwarding as if the packet had just 654 * arrived on the interface to which we are about 655 * to send. The multicast forwarding function 656 * recursively calls this function, using the 657 * IPV6_FORWARDING flag to prevent infinite recursion. 658 * 659 * Multicasts that are looped back by ip6_mloopback(), 660 * above, will be forwarded by the ip6_input() routine, 661 * if necessary. 662 */ 663 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 664 if (ip6_mforward(ip6, ifp, m) != 0) { 665 m_freem(m); 666 goto done; 667 } 668 } 669 } 670 /* 671 * Multicasts with a hoplimit of zero may be looped back, 672 * above, but must not be transmitted on a network. 673 * Also, multicasts addressed to the loopback interface 674 * are not sent -- the above call to ip6_mloopback() will 675 * loop back a copy if this host actually belongs to the 676 * destination group on the loopback interface. 677 */ 678 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 679 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 680 m_freem(m); 681 goto done; 682 } 683 } 684 685 /* 686 * Fill the outgoing inteface to tell the upper layer 687 * to increment per-interface statistics. 688 */ 689 if (ifpp) 690 *ifpp = ifp; 691 692 /* Determine path MTU. */ 693 /* 694 * ro_pmtu represent final destination while 695 * ro might represent immediate destination. 696 * Use ro_pmtu destination since MTU might differ. 697 */ 698 if (ro_pmtu != ro) { 699 union { 700 struct sockaddr dst; 701 struct sockaddr_in6 dst6; 702 } u; 703 704 /* ro_pmtu may not have a cache */ 705 sockaddr_in6_init(&u.dst6, &finaldst, 0, 0, 0); 706 rt_pmtu = rtcache_lookup(ro_pmtu, &u.dst); 707 } else 708 rt_pmtu = rt; 709 error = ip6_getpmtu(rt_pmtu, ifp, &mtu, &alwaysfrag); 710 if (rt_pmtu != NULL && rt_pmtu != rt) 711 rtcache_unref(rt_pmtu, ro_pmtu); 712 KASSERT(error == 0); /* ip6_getpmtu never fail if ifp is passed */ 713 714 /* 715 * The caller of this function may specify to use the minimum MTU 716 * in some cases. 717 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 718 * setting. The logic is a bit complicated; by default, unicast 719 * packets will follow path MTU while multicast packets will be sent at 720 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 721 * including unicast ones will be sent at the minimum MTU. Multicast 722 * packets will always be sent at the minimum MTU unless 723 * IP6PO_MINMTU_DISABLE is explicitly specified. 724 * See RFC 3542 for more details. 725 */ 726 if (mtu > IPV6_MMTU) { 727 if ((flags & IPV6_MINMTU)) 728 mtu = IPV6_MMTU; 729 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 730 mtu = IPV6_MMTU; 731 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 732 (opt == NULL || 733 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 734 mtu = IPV6_MMTU; 735 } 736 } 737 738 /* 739 * clear embedded scope identifiers if necessary. 740 * in6_clearscope will touch the addresses only when necessary. 741 */ 742 in6_clearscope(&ip6->ip6_src); 743 in6_clearscope(&ip6->ip6_dst); 744 745 /* 746 * If the outgoing packet contains a hop-by-hop options header, 747 * it must be examined and processed even by the source node. 748 * (RFC 2460, section 4.) 749 * 750 * XXX Is this really necessary? 751 */ 752 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 753 u_int32_t dummy1; /* XXX unused */ 754 u_int32_t dummy2; /* XXX unused */ 755 int hoff = sizeof(struct ip6_hdr); 756 757 if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) { 758 /* m was already freed at this point */ 759 error = EINVAL; 760 goto done; 761 } 762 763 ip6 = mtod(m, struct ip6_hdr *); 764 } 765 766 /* 767 * Run through list of hooks for output packets. 768 */ 769 error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT); 770 if (error != 0 || m == NULL) { 771 IP6_STATINC(IP6_STAT_PFILDROP_OUT); 772 goto done; 773 } 774 ip6 = mtod(m, struct ip6_hdr *); 775 776 /* 777 * Send the packet to the outgoing interface. 778 * If necessary, do IPv6 fragmentation before sending. 779 * 780 * the logic here is rather complex: 781 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 782 * 1-a: send as is if tlen <= path mtu 783 * 1-b: fragment if tlen > path mtu 784 * 785 * 2: if user asks us not to fragment (dontfrag == 1) 786 * 2-a: send as is if tlen <= interface mtu 787 * 2-b: error if tlen > interface mtu 788 * 789 * 3: if we always need to attach fragment header (alwaysfrag == 1) 790 * always fragment 791 * 792 * 4: if dontfrag == 1 && alwaysfrag == 1 793 * error, as we cannot handle this conflicting request 794 */ 795 tlen = m->m_pkthdr.len; 796 tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; 797 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 798 dontfrag = 1; 799 else 800 dontfrag = 0; 801 802 if (dontfrag && alwaysfrag) { /* case 4 */ 803 /* conflicting request - can't transmit */ 804 IP6_STATINC(IP6_STAT_CANTFRAG); 805 error = EMSGSIZE; 806 goto bad; 807 } 808 if (dontfrag && (!tso && tlen > ifp->if_mtu)) { /* case 2-b */ 809 /* 810 * Even if the DONTFRAG option is specified, we cannot send the 811 * packet when the data length is larger than the MTU of the 812 * outgoing interface. 813 * Notify the error by sending IPV6_PATHMTU ancillary data as 814 * well as returning an error code (the latter is not described 815 * in the API spec.) 816 */ 817 u_int32_t mtu32; 818 struct ip6ctlparam ip6cp; 819 820 mtu32 = (u_int32_t)mtu; 821 memset(&ip6cp, 0, sizeof(ip6cp)); 822 ip6cp.ip6c_cmdarg = (void *)&mtu32; 823 pfctlinput2(PRC_MSGSIZE, 824 rtcache_getdst(ro_pmtu), &ip6cp); 825 826 IP6_STATINC(IP6_STAT_CANTFRAG); 827 error = EMSGSIZE; 828 goto bad; 829 } 830 831 /* 832 * transmit packet without fragmentation 833 */ 834 if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { 835 /* case 1-a and 2-a */ 836 struct in6_ifaddr *ia6; 837 int sw_csum; 838 int s; 839 840 ip6 = mtod(m, struct ip6_hdr *); 841 s = pserialize_read_enter(); 842 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 843 if (ia6) { 844 /* Record statistics for this interface address. */ 845 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 846 } 847 pserialize_read_exit(s); 848 849 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 850 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 851 if (IN6_NEED_CHECKSUM(ifp, 852 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 853 in6_undefer_cksum_tcpudp(m); 854 } 855 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 856 } 857 858 KASSERT(dst != NULL); 859 if (__predict_false(sw_csum & M_CSUM_TSOv6)) { 860 /* 861 * TSO6 is required by a packet, but disabled for 862 * the interface. 863 */ 864 error = ip6_tso_output(ifp, origifp, m, dst, rt); 865 } else 866 error = ip6_if_output(ifp, origifp, m, dst, rt); 867 goto done; 868 } 869 870 if (tso) { 871 IP6_STATINC(IP6_STAT_CANTFRAG); /* XXX */ 872 error = EINVAL; /* XXX */ 873 goto bad; 874 } 875 876 /* 877 * try to fragment the packet. case 1-b and 3 878 */ 879 if (mtu < IPV6_MMTU) { 880 /* path MTU cannot be less than IPV6_MMTU */ 881 IP6_STATINC(IP6_STAT_CANTFRAG); 882 error = EMSGSIZE; 883 in6_ifstat_inc(ifp, ifs6_out_fragfail); 884 goto bad; 885 } else if (ip6->ip6_plen == 0) { 886 /* jumbo payload cannot be fragmented */ 887 IP6_STATINC(IP6_STAT_CANTFRAG); 888 error = EMSGSIZE; 889 in6_ifstat_inc(ifp, ifs6_out_fragfail); 890 goto bad; 891 } else { 892 const uint32_t id = ip6_randomid(); 893 struct mbuf **mnext, *m_frgpart; 894 const int hlen = unfragpartlen; 895 struct ip6_frag *ip6f; 896 u_char nextproto; 897 898 if (mtu > IPV6_MAXPACKET) 899 mtu = IPV6_MAXPACKET; 900 901 /* 902 * Must be able to put at least 8 bytes per fragment. 903 */ 904 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 905 if (len < 8) { 906 IP6_STATINC(IP6_STAT_CANTFRAG); 907 error = EMSGSIZE; 908 in6_ifstat_inc(ifp, ifs6_out_fragfail); 909 goto bad; 910 } 911 912 mnext = &m->m_nextpkt; 913 914 /* 915 * Change the next header field of the last header in the 916 * unfragmentable part. 917 */ 918 if (exthdrs.ip6e_rthdr) { 919 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 920 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 921 } else if (exthdrs.ip6e_dest1) { 922 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 923 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 924 } else if (exthdrs.ip6e_hbh) { 925 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 926 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 927 } else { 928 nextproto = ip6->ip6_nxt; 929 ip6->ip6_nxt = IPPROTO_FRAGMENT; 930 } 931 932 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 933 != 0) { 934 if (IN6_NEED_CHECKSUM(ifp, 935 m->m_pkthdr.csum_flags & 936 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 937 in6_undefer_cksum_tcpudp(m); 938 } 939 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 940 } 941 942 /* 943 * Loop through length of segment after first fragment, 944 * make new header and copy data of each part and link onto 945 * chain. 946 */ 947 m0 = m; 948 for (off = hlen; off < tlen; off += len) { 949 struct mbuf *mlast; 950 951 MGETHDR(m, M_DONTWAIT, MT_HEADER); 952 if (!m) { 953 error = ENOBUFS; 954 IP6_STATINC(IP6_STAT_ODROPPED); 955 goto sendorfree; 956 } 957 m_reset_rcvif(m); 958 m->m_flags = m0->m_flags & M_COPYFLAGS; 959 *mnext = m; 960 mnext = &m->m_nextpkt; 961 m->m_data += max_linkhdr; 962 mhip6 = mtod(m, struct ip6_hdr *); 963 *mhip6 = *ip6; 964 m->m_len = sizeof(*mhip6); 965 966 ip6f = NULL; 967 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 968 if (error) { 969 IP6_STATINC(IP6_STAT_ODROPPED); 970 goto sendorfree; 971 } 972 973 /* Fill in the Frag6 Header */ 974 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 975 if (off + len >= tlen) 976 len = tlen - off; 977 else 978 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 979 ip6f->ip6f_reserved = 0; 980 ip6f->ip6f_ident = id; 981 ip6f->ip6f_nxt = nextproto; 982 983 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 984 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 985 if ((m_frgpart = m_copym(m0, off, len, M_DONTWAIT)) == NULL) { 986 error = ENOBUFS; 987 IP6_STATINC(IP6_STAT_ODROPPED); 988 goto sendorfree; 989 } 990 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 991 ; 992 mlast->m_next = m_frgpart; 993 994 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 995 m_reset_rcvif(m); 996 IP6_STATINC(IP6_STAT_OFRAGMENTS); 997 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 998 } 999 1000 in6_ifstat_inc(ifp, ifs6_out_fragok); 1001 } 1002 1003 sendorfree: 1004 m = m0->m_nextpkt; 1005 m0->m_nextpkt = 0; 1006 m_freem(m0); 1007 for (m0 = m; m; m = m0) { 1008 m0 = m->m_nextpkt; 1009 m->m_nextpkt = 0; 1010 if (error == 0) { 1011 struct in6_ifaddr *ia6; 1012 int s; 1013 ip6 = mtod(m, struct ip6_hdr *); 1014 s = pserialize_read_enter(); 1015 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1016 if (ia6) { 1017 /* 1018 * Record statistics for this interface 1019 * address. 1020 */ 1021 ia6->ia_ifa.ifa_data.ifad_outbytes += 1022 m->m_pkthdr.len; 1023 } 1024 pserialize_read_exit(s); 1025 KASSERT(dst != NULL); 1026 error = ip6_if_output(ifp, origifp, m, dst, rt); 1027 } else 1028 m_freem(m); 1029 } 1030 1031 if (error == 0) 1032 IP6_STATINC(IP6_STAT_FRAGMENTED); 1033 1034 done: 1035 rtcache_unref(rt, ro); 1036 if (ro == &ip6route) 1037 rtcache_free(&ip6route); 1038 #ifdef IPSEC 1039 if (sp != NULL) 1040 KEY_SP_UNREF(&sp); 1041 #endif 1042 if_put(ifp, &psref); 1043 if (release_psref_ia) 1044 if_put(origifp, &psref_ia); 1045 curlwp_bindx(bound); 1046 1047 return error; 1048 1049 freehdrs: 1050 m_freem(exthdrs.ip6e_hbh); 1051 m_freem(exthdrs.ip6e_dest1); 1052 m_freem(exthdrs.ip6e_rthdr); 1053 m_freem(exthdrs.ip6e_dest2); 1054 /* FALLTHROUGH */ 1055 bad: 1056 m_freem(m); 1057 goto done; 1058 1059 badscope: 1060 IP6_STATINC(IP6_STAT_BADSCOPE); 1061 in6_ifstat_inc(origifp, ifs6_out_discard); 1062 if (error == 0) 1063 error = EHOSTUNREACH; /* XXX */ 1064 goto bad; 1065 } 1066 1067 static int 1068 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1069 { 1070 struct mbuf *m; 1071 1072 if (hlen > MCLBYTES) 1073 return ENOBUFS; /* XXX */ 1074 1075 MGET(m, M_DONTWAIT, MT_DATA); 1076 if (!m) 1077 return ENOBUFS; 1078 1079 if (hlen > MLEN) { 1080 MCLGET(m, M_DONTWAIT); 1081 if ((m->m_flags & M_EXT) == 0) { 1082 m_free(m); 1083 return ENOBUFS; 1084 } 1085 } 1086 m->m_len = hlen; 1087 if (hdr) 1088 memcpy(mtod(m, void *), hdr, hlen); 1089 1090 *mp = m; 1091 return 0; 1092 } 1093 1094 /* 1095 * Insert jumbo payload option. 1096 */ 1097 static int 1098 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1099 { 1100 struct mbuf *mopt; 1101 u_int8_t *optbuf; 1102 u_int32_t v; 1103 1104 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1105 1106 /* 1107 * If there is no hop-by-hop options header, allocate new one. 1108 * If there is one but it doesn't have enough space to store the 1109 * jumbo payload option, allocate a cluster to store the whole options. 1110 * Otherwise, use it to store the options. 1111 */ 1112 if (exthdrs->ip6e_hbh == NULL) { 1113 MGET(mopt, M_DONTWAIT, MT_DATA); 1114 if (mopt == 0) 1115 return (ENOBUFS); 1116 mopt->m_len = JUMBOOPTLEN; 1117 optbuf = mtod(mopt, u_int8_t *); 1118 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1119 exthdrs->ip6e_hbh = mopt; 1120 } else { 1121 struct ip6_hbh *hbh; 1122 1123 mopt = exthdrs->ip6e_hbh; 1124 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1125 const int oldoptlen = mopt->m_len; 1126 struct mbuf *n; 1127 1128 /* 1129 * Assumptions: 1130 * - exthdrs->ip6e_hbh is not referenced from places 1131 * other than exthdrs. 1132 * - exthdrs->ip6e_hbh is not an mbuf chain. 1133 */ 1134 KASSERT(mopt->m_next == NULL); 1135 1136 /* 1137 * Give up if the whole (new) hbh header does not fit 1138 * even in an mbuf cluster. 1139 */ 1140 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1141 return ENOBUFS; 1142 1143 /* 1144 * At this point, we must always prepare a cluster. 1145 */ 1146 MGET(n, M_DONTWAIT, MT_DATA); 1147 if (n) { 1148 MCLGET(n, M_DONTWAIT); 1149 if ((n->m_flags & M_EXT) == 0) { 1150 m_freem(n); 1151 n = NULL; 1152 } 1153 } 1154 if (!n) 1155 return ENOBUFS; 1156 1157 n->m_len = oldoptlen + JUMBOOPTLEN; 1158 bcopy(mtod(mopt, void *), mtod(n, void *), 1159 oldoptlen); 1160 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1161 m_freem(mopt); 1162 mopt = exthdrs->ip6e_hbh = n; 1163 } else { 1164 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1165 mopt->m_len += JUMBOOPTLEN; 1166 } 1167 optbuf[0] = IP6OPT_PADN; 1168 optbuf[1] = 0; 1169 1170 /* 1171 * Adjust the header length according to the pad and 1172 * the jumbo payload option. 1173 */ 1174 hbh = mtod(mopt, struct ip6_hbh *); 1175 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1176 } 1177 1178 /* fill in the option. */ 1179 optbuf[2] = IP6OPT_JUMBO; 1180 optbuf[3] = 4; 1181 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1182 memcpy(&optbuf[4], &v, sizeof(u_int32_t)); 1183 1184 /* finally, adjust the packet header length */ 1185 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1186 1187 return 0; 1188 #undef JUMBOOPTLEN 1189 } 1190 1191 /* 1192 * Insert fragment header and copy unfragmentable header portions. 1193 * 1194 * *frghdrp will not be read, and it is guaranteed that either an 1195 * error is returned or that *frghdrp will point to space allocated 1196 * for the fragment header. 1197 * 1198 * On entry, m contains: 1199 * IPv6 Header 1200 * On exit, it contains: 1201 * IPv6 Header -> Unfragmentable Part -> Frag6 Header 1202 */ 1203 static int 1204 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1205 struct ip6_frag **frghdrp) 1206 { 1207 struct mbuf *n, *mlast; 1208 1209 if (hlen > sizeof(struct ip6_hdr)) { 1210 n = m_copym(m0, sizeof(struct ip6_hdr), 1211 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1212 if (n == NULL) 1213 return ENOBUFS; 1214 m->m_next = n; 1215 } else 1216 n = m; 1217 1218 /* Search for the last mbuf of unfragmentable part. */ 1219 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1220 ; 1221 1222 if ((mlast->m_flags & M_EXT) == 0 && 1223 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1224 /* use the trailing space of the last mbuf for the fragment hdr */ 1225 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1226 mlast->m_len); 1227 mlast->m_len += sizeof(struct ip6_frag); 1228 } else { 1229 /* allocate a new mbuf for the fragment header */ 1230 struct mbuf *mfrg; 1231 1232 MGET(mfrg, M_DONTWAIT, MT_DATA); 1233 if (mfrg == NULL) 1234 return ENOBUFS; 1235 mfrg->m_len = sizeof(struct ip6_frag); 1236 *frghdrp = mtod(mfrg, struct ip6_frag *); 1237 mlast->m_next = mfrg; 1238 } 1239 1240 return 0; 1241 } 1242 1243 static int 1244 ip6_getpmtu(struct rtentry *rt, struct ifnet *ifp, u_long *mtup, 1245 int *alwaysfragp) 1246 { 1247 u_int32_t mtu = 0; 1248 int alwaysfrag = 0; 1249 int error = 0; 1250 1251 if (rt != NULL) { 1252 if (ifp == NULL) 1253 ifp = rt->rt_ifp; 1254 mtu = rt->rt_rmx.rmx_mtu; 1255 if (mtu == 0) 1256 mtu = ifp->if_mtu; 1257 else if (mtu < IPV6_MMTU) { 1258 /* 1259 * RFC2460 section 5, last paragraph: 1260 * if we record ICMPv6 too big message with 1261 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1262 * or smaller, with fragment header attached. 1263 * (fragment header is needed regardless from the 1264 * packet size, for translators to identify packets) 1265 */ 1266 alwaysfrag = 1; 1267 mtu = IPV6_MMTU; 1268 } else if (mtu > ifp->if_mtu) { 1269 /* 1270 * The MTU on the route is larger than the MTU on 1271 * the interface! This shouldn't happen, unless the 1272 * MTU of the interface has been changed after the 1273 * interface was brought up. Change the MTU in the 1274 * route to match the interface MTU (as long as the 1275 * field isn't locked). 1276 */ 1277 mtu = ifp->if_mtu; 1278 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1279 rt->rt_rmx.rmx_mtu = mtu; 1280 } 1281 } else if (ifp) { 1282 mtu = ifp->if_mtu; 1283 } else 1284 error = EHOSTUNREACH; /* XXX */ 1285 1286 *mtup = mtu; 1287 if (alwaysfragp) 1288 *alwaysfragp = alwaysfrag; 1289 return (error); 1290 } 1291 1292 /* 1293 * IP6 socket option processing. 1294 */ 1295 int 1296 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1297 { 1298 int optdatalen, uproto; 1299 void *optdata; 1300 struct in6pcb *in6p = sotoin6pcb(so); 1301 struct ip_moptions **mopts; 1302 int error, optval; 1303 int level, optname; 1304 1305 KASSERT(solocked(so)); 1306 KASSERT(sopt != NULL); 1307 1308 level = sopt->sopt_level; 1309 optname = sopt->sopt_name; 1310 1311 error = optval = 0; 1312 uproto = (int)so->so_proto->pr_protocol; 1313 1314 switch (level) { 1315 case IPPROTO_IP: 1316 switch (optname) { 1317 case IP_ADD_MEMBERSHIP: 1318 case IP_DROP_MEMBERSHIP: 1319 case IP_MULTICAST_IF: 1320 case IP_MULTICAST_LOOP: 1321 case IP_MULTICAST_TTL: 1322 mopts = &in6p->in6p_v4moptions; 1323 switch (op) { 1324 case PRCO_GETOPT: 1325 return ip_getmoptions(*mopts, sopt); 1326 case PRCO_SETOPT: 1327 return ip_setmoptions(mopts, sopt); 1328 default: 1329 return EINVAL; 1330 } 1331 default: 1332 return ENOPROTOOPT; 1333 } 1334 case IPPROTO_IPV6: 1335 break; 1336 default: 1337 return ENOPROTOOPT; 1338 } 1339 switch (op) { 1340 case PRCO_SETOPT: 1341 switch (optname) { 1342 #ifdef RFC2292 1343 case IPV6_2292PKTOPTIONS: 1344 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1345 break; 1346 #endif 1347 1348 /* 1349 * Use of some Hop-by-Hop options or some 1350 * Destination options, might require special 1351 * privilege. That is, normal applications 1352 * (without special privilege) might be forbidden 1353 * from setting certain options in outgoing packets, 1354 * and might never see certain options in received 1355 * packets. [RFC 2292 Section 6] 1356 * KAME specific note: 1357 * KAME prevents non-privileged users from sending or 1358 * receiving ANY hbh/dst options in order to avoid 1359 * overhead of parsing options in the kernel. 1360 */ 1361 case IPV6_RECVHOPOPTS: 1362 case IPV6_RECVDSTOPTS: 1363 case IPV6_RECVRTHDRDSTOPTS: 1364 error = kauth_authorize_network(kauth_cred_get(), 1365 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1366 NULL, NULL, NULL); 1367 if (error) 1368 break; 1369 /* FALLTHROUGH */ 1370 case IPV6_UNICAST_HOPS: 1371 case IPV6_HOPLIMIT: 1372 case IPV6_FAITH: 1373 1374 case IPV6_RECVPKTINFO: 1375 case IPV6_RECVHOPLIMIT: 1376 case IPV6_RECVRTHDR: 1377 case IPV6_RECVPATHMTU: 1378 case IPV6_RECVTCLASS: 1379 case IPV6_V6ONLY: 1380 case IPV6_BINDANY: 1381 error = sockopt_getint(sopt, &optval); 1382 if (error) 1383 break; 1384 switch (optname) { 1385 case IPV6_UNICAST_HOPS: 1386 if (optval < -1 || optval >= 256) 1387 error = EINVAL; 1388 else { 1389 /* -1 = kernel default */ 1390 in6p->in6p_hops = optval; 1391 } 1392 break; 1393 #define OPTSET(bit) \ 1394 do { \ 1395 if (optval) \ 1396 in6p->in6p_flags |= (bit); \ 1397 else \ 1398 in6p->in6p_flags &= ~(bit); \ 1399 } while (/*CONSTCOND*/ 0) 1400 1401 #ifdef RFC2292 1402 #define OPTSET2292(bit) \ 1403 do { \ 1404 in6p->in6p_flags |= IN6P_RFC2292; \ 1405 if (optval) \ 1406 in6p->in6p_flags |= (bit); \ 1407 else \ 1408 in6p->in6p_flags &= ~(bit); \ 1409 } while (/*CONSTCOND*/ 0) 1410 #endif 1411 1412 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1413 1414 case IPV6_RECVPKTINFO: 1415 #ifdef RFC2292 1416 /* cannot mix with RFC2292 */ 1417 if (OPTBIT(IN6P_RFC2292)) { 1418 error = EINVAL; 1419 break; 1420 } 1421 #endif 1422 OPTSET(IN6P_PKTINFO); 1423 break; 1424 1425 case IPV6_HOPLIMIT: 1426 { 1427 struct ip6_pktopts **optp; 1428 1429 #ifdef RFC2292 1430 /* cannot mix with RFC2292 */ 1431 if (OPTBIT(IN6P_RFC2292)) { 1432 error = EINVAL; 1433 break; 1434 } 1435 #endif 1436 optp = &in6p->in6p_outputopts; 1437 error = ip6_pcbopt(IPV6_HOPLIMIT, 1438 (u_char *)&optval, 1439 sizeof(optval), 1440 optp, 1441 kauth_cred_get(), uproto); 1442 break; 1443 } 1444 1445 case IPV6_RECVHOPLIMIT: 1446 #ifdef RFC2292 1447 /* cannot mix with RFC2292 */ 1448 if (OPTBIT(IN6P_RFC2292)) { 1449 error = EINVAL; 1450 break; 1451 } 1452 #endif 1453 OPTSET(IN6P_HOPLIMIT); 1454 break; 1455 1456 case IPV6_RECVHOPOPTS: 1457 #ifdef RFC2292 1458 /* cannot mix with RFC2292 */ 1459 if (OPTBIT(IN6P_RFC2292)) { 1460 error = EINVAL; 1461 break; 1462 } 1463 #endif 1464 OPTSET(IN6P_HOPOPTS); 1465 break; 1466 1467 case IPV6_RECVDSTOPTS: 1468 #ifdef RFC2292 1469 /* cannot mix with RFC2292 */ 1470 if (OPTBIT(IN6P_RFC2292)) { 1471 error = EINVAL; 1472 break; 1473 } 1474 #endif 1475 OPTSET(IN6P_DSTOPTS); 1476 break; 1477 1478 case IPV6_RECVRTHDRDSTOPTS: 1479 #ifdef RFC2292 1480 /* cannot mix with RFC2292 */ 1481 if (OPTBIT(IN6P_RFC2292)) { 1482 error = EINVAL; 1483 break; 1484 } 1485 #endif 1486 OPTSET(IN6P_RTHDRDSTOPTS); 1487 break; 1488 1489 case IPV6_RECVRTHDR: 1490 #ifdef RFC2292 1491 /* cannot mix with RFC2292 */ 1492 if (OPTBIT(IN6P_RFC2292)) { 1493 error = EINVAL; 1494 break; 1495 } 1496 #endif 1497 OPTSET(IN6P_RTHDR); 1498 break; 1499 1500 case IPV6_FAITH: 1501 OPTSET(IN6P_FAITH); 1502 break; 1503 1504 case IPV6_RECVPATHMTU: 1505 /* 1506 * We ignore this option for TCP 1507 * sockets. 1508 * (RFC3542 leaves this case 1509 * unspecified.) 1510 */ 1511 if (uproto != IPPROTO_TCP) 1512 OPTSET(IN6P_MTU); 1513 break; 1514 1515 case IPV6_V6ONLY: 1516 /* 1517 * make setsockopt(IPV6_V6ONLY) 1518 * available only prior to bind(2). 1519 * see ipng mailing list, Jun 22 2001. 1520 */ 1521 if (in6p->in6p_lport || 1522 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1523 error = EINVAL; 1524 break; 1525 } 1526 #ifdef INET6_BINDV6ONLY 1527 if (!optval) 1528 error = EINVAL; 1529 #else 1530 OPTSET(IN6P_IPV6_V6ONLY); 1531 #endif 1532 break; 1533 1534 case IPV6_RECVTCLASS: 1535 #ifdef RFC2292 1536 /* cannot mix with RFC2292 XXX */ 1537 if (OPTBIT(IN6P_RFC2292)) { 1538 error = EINVAL; 1539 break; 1540 } 1541 #endif 1542 OPTSET(IN6P_TCLASS); 1543 break; 1544 1545 case IPV6_BINDANY: 1546 error = kauth_authorize_network( 1547 kauth_cred_get(), KAUTH_NETWORK_BIND, 1548 KAUTH_REQ_NETWORK_BIND_ANYADDR, so, NULL, 1549 NULL); 1550 if (error) 1551 break; 1552 OPTSET(IN6P_BINDANY); 1553 break; 1554 } 1555 break; 1556 1557 case IPV6_OTCLASS: 1558 { 1559 struct ip6_pktopts **optp; 1560 u_int8_t tclass; 1561 1562 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1563 if (error) 1564 break; 1565 optp = &in6p->in6p_outputopts; 1566 error = ip6_pcbopt(optname, 1567 (u_char *)&tclass, 1568 sizeof(tclass), 1569 optp, 1570 kauth_cred_get(), uproto); 1571 break; 1572 } 1573 1574 case IPV6_TCLASS: 1575 case IPV6_DONTFRAG: 1576 case IPV6_USE_MIN_MTU: 1577 case IPV6_PREFER_TEMPADDR: 1578 error = sockopt_getint(sopt, &optval); 1579 if (error) 1580 break; 1581 { 1582 struct ip6_pktopts **optp; 1583 optp = &in6p->in6p_outputopts; 1584 error = ip6_pcbopt(optname, 1585 (u_char *)&optval, 1586 sizeof(optval), 1587 optp, 1588 kauth_cred_get(), uproto); 1589 break; 1590 } 1591 1592 #ifdef RFC2292 1593 case IPV6_2292PKTINFO: 1594 case IPV6_2292HOPLIMIT: 1595 case IPV6_2292HOPOPTS: 1596 case IPV6_2292DSTOPTS: 1597 case IPV6_2292RTHDR: 1598 /* RFC 2292 */ 1599 error = sockopt_getint(sopt, &optval); 1600 if (error) 1601 break; 1602 1603 switch (optname) { 1604 case IPV6_2292PKTINFO: 1605 OPTSET2292(IN6P_PKTINFO); 1606 break; 1607 case IPV6_2292HOPLIMIT: 1608 OPTSET2292(IN6P_HOPLIMIT); 1609 break; 1610 case IPV6_2292HOPOPTS: 1611 /* 1612 * Check super-user privilege. 1613 * See comments for IPV6_RECVHOPOPTS. 1614 */ 1615 error = 1616 kauth_authorize_network(kauth_cred_get(), 1617 KAUTH_NETWORK_IPV6, 1618 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1619 NULL, NULL); 1620 if (error) 1621 return (error); 1622 OPTSET2292(IN6P_HOPOPTS); 1623 break; 1624 case IPV6_2292DSTOPTS: 1625 error = 1626 kauth_authorize_network(kauth_cred_get(), 1627 KAUTH_NETWORK_IPV6, 1628 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1629 NULL, NULL); 1630 if (error) 1631 return (error); 1632 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1633 break; 1634 case IPV6_2292RTHDR: 1635 OPTSET2292(IN6P_RTHDR); 1636 break; 1637 } 1638 break; 1639 #endif 1640 case IPV6_PKTINFO: 1641 case IPV6_HOPOPTS: 1642 case IPV6_RTHDR: 1643 case IPV6_DSTOPTS: 1644 case IPV6_RTHDRDSTOPTS: 1645 case IPV6_NEXTHOP: { 1646 /* new advanced API (RFC3542) */ 1647 void *optbuf; 1648 int optbuflen; 1649 struct ip6_pktopts **optp; 1650 1651 #ifdef RFC2292 1652 /* cannot mix with RFC2292 */ 1653 if (OPTBIT(IN6P_RFC2292)) { 1654 error = EINVAL; 1655 break; 1656 } 1657 #endif 1658 1659 optbuflen = sopt->sopt_size; 1660 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1661 if (optbuf == NULL) { 1662 error = ENOBUFS; 1663 break; 1664 } 1665 1666 error = sockopt_get(sopt, optbuf, optbuflen); 1667 if (error) { 1668 free(optbuf, M_IP6OPT); 1669 break; 1670 } 1671 optp = &in6p->in6p_outputopts; 1672 error = ip6_pcbopt(optname, optbuf, optbuflen, 1673 optp, kauth_cred_get(), uproto); 1674 1675 free(optbuf, M_IP6OPT); 1676 break; 1677 } 1678 #undef OPTSET 1679 1680 case IPV6_MULTICAST_IF: 1681 case IPV6_MULTICAST_HOPS: 1682 case IPV6_MULTICAST_LOOP: 1683 case IPV6_JOIN_GROUP: 1684 case IPV6_LEAVE_GROUP: 1685 error = ip6_setmoptions(sopt, in6p); 1686 break; 1687 1688 case IPV6_PORTRANGE: 1689 error = sockopt_getint(sopt, &optval); 1690 if (error) 1691 break; 1692 1693 switch (optval) { 1694 case IPV6_PORTRANGE_DEFAULT: 1695 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1696 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1697 break; 1698 1699 case IPV6_PORTRANGE_HIGH: 1700 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1701 in6p->in6p_flags |= IN6P_HIGHPORT; 1702 break; 1703 1704 case IPV6_PORTRANGE_LOW: 1705 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1706 in6p->in6p_flags |= IN6P_LOWPORT; 1707 break; 1708 1709 default: 1710 error = EINVAL; 1711 break; 1712 } 1713 break; 1714 1715 case IPV6_PORTALGO: 1716 error = sockopt_getint(sopt, &optval); 1717 if (error) 1718 break; 1719 1720 error = portalgo_algo_index_select( 1721 (struct inpcb_hdr *)in6p, optval); 1722 break; 1723 1724 #if defined(IPSEC) 1725 case IPV6_IPSEC_POLICY: 1726 if (ipsec_enabled) { 1727 error = ipsec_set_policy(in6p, 1728 sopt->sopt_data, sopt->sopt_size, 1729 kauth_cred_get()); 1730 } else 1731 error = ENOPROTOOPT; 1732 break; 1733 #endif /* IPSEC */ 1734 1735 default: 1736 error = ENOPROTOOPT; 1737 break; 1738 } 1739 break; 1740 1741 case PRCO_GETOPT: 1742 switch (optname) { 1743 #ifdef RFC2292 1744 case IPV6_2292PKTOPTIONS: 1745 /* 1746 * RFC3542 (effectively) deprecated the 1747 * semantics of the 2292-style pktoptions. 1748 * Since it was not reliable in nature (i.e., 1749 * applications had to expect the lack of some 1750 * information after all), it would make sense 1751 * to simplify this part by always returning 1752 * empty data. 1753 */ 1754 break; 1755 #endif 1756 1757 case IPV6_RECVHOPOPTS: 1758 case IPV6_RECVDSTOPTS: 1759 case IPV6_RECVRTHDRDSTOPTS: 1760 case IPV6_UNICAST_HOPS: 1761 case IPV6_RECVPKTINFO: 1762 case IPV6_RECVHOPLIMIT: 1763 case IPV6_RECVRTHDR: 1764 case IPV6_RECVPATHMTU: 1765 1766 case IPV6_FAITH: 1767 case IPV6_V6ONLY: 1768 case IPV6_PORTRANGE: 1769 case IPV6_RECVTCLASS: 1770 case IPV6_BINDANY: 1771 switch (optname) { 1772 1773 case IPV6_RECVHOPOPTS: 1774 optval = OPTBIT(IN6P_HOPOPTS); 1775 break; 1776 1777 case IPV6_RECVDSTOPTS: 1778 optval = OPTBIT(IN6P_DSTOPTS); 1779 break; 1780 1781 case IPV6_RECVRTHDRDSTOPTS: 1782 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1783 break; 1784 1785 case IPV6_UNICAST_HOPS: 1786 optval = in6p->in6p_hops; 1787 break; 1788 1789 case IPV6_RECVPKTINFO: 1790 optval = OPTBIT(IN6P_PKTINFO); 1791 break; 1792 1793 case IPV6_RECVHOPLIMIT: 1794 optval = OPTBIT(IN6P_HOPLIMIT); 1795 break; 1796 1797 case IPV6_RECVRTHDR: 1798 optval = OPTBIT(IN6P_RTHDR); 1799 break; 1800 1801 case IPV6_RECVPATHMTU: 1802 optval = OPTBIT(IN6P_MTU); 1803 break; 1804 1805 case IPV6_FAITH: 1806 optval = OPTBIT(IN6P_FAITH); 1807 break; 1808 1809 case IPV6_V6ONLY: 1810 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1811 break; 1812 1813 case IPV6_PORTRANGE: 1814 { 1815 int flags; 1816 flags = in6p->in6p_flags; 1817 if (flags & IN6P_HIGHPORT) 1818 optval = IPV6_PORTRANGE_HIGH; 1819 else if (flags & IN6P_LOWPORT) 1820 optval = IPV6_PORTRANGE_LOW; 1821 else 1822 optval = 0; 1823 break; 1824 } 1825 case IPV6_RECVTCLASS: 1826 optval = OPTBIT(IN6P_TCLASS); 1827 break; 1828 1829 case IPV6_BINDANY: 1830 optval = OPTBIT(IN6P_BINDANY); 1831 break; 1832 } 1833 1834 if (error) 1835 break; 1836 error = sockopt_setint(sopt, optval); 1837 break; 1838 1839 case IPV6_PATHMTU: 1840 { 1841 u_long pmtu = 0; 1842 struct ip6_mtuinfo mtuinfo; 1843 struct route *ro = &in6p->in6p_route; 1844 struct rtentry *rt; 1845 union { 1846 struct sockaddr dst; 1847 struct sockaddr_in6 dst6; 1848 } u; 1849 1850 if (!(so->so_state & SS_ISCONNECTED)) 1851 return (ENOTCONN); 1852 /* 1853 * XXX: we dot not consider the case of source 1854 * routing, or optional information to specify 1855 * the outgoing interface. 1856 */ 1857 sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0); 1858 rt = rtcache_lookup(ro, &u.dst); 1859 error = ip6_getpmtu(rt, NULL, &pmtu, NULL); 1860 rtcache_unref(rt, ro); 1861 if (error) 1862 break; 1863 if (pmtu > IPV6_MAXPACKET) 1864 pmtu = IPV6_MAXPACKET; 1865 1866 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1867 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1868 optdata = (void *)&mtuinfo; 1869 optdatalen = sizeof(mtuinfo); 1870 if (optdatalen > MCLBYTES) 1871 return (EMSGSIZE); /* XXX */ 1872 error = sockopt_set(sopt, optdata, optdatalen); 1873 break; 1874 } 1875 1876 #ifdef RFC2292 1877 case IPV6_2292PKTINFO: 1878 case IPV6_2292HOPLIMIT: 1879 case IPV6_2292HOPOPTS: 1880 case IPV6_2292RTHDR: 1881 case IPV6_2292DSTOPTS: 1882 switch (optname) { 1883 case IPV6_2292PKTINFO: 1884 optval = OPTBIT(IN6P_PKTINFO); 1885 break; 1886 case IPV6_2292HOPLIMIT: 1887 optval = OPTBIT(IN6P_HOPLIMIT); 1888 break; 1889 case IPV6_2292HOPOPTS: 1890 optval = OPTBIT(IN6P_HOPOPTS); 1891 break; 1892 case IPV6_2292RTHDR: 1893 optval = OPTBIT(IN6P_RTHDR); 1894 break; 1895 case IPV6_2292DSTOPTS: 1896 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1897 break; 1898 } 1899 error = sockopt_setint(sopt, optval); 1900 break; 1901 #endif 1902 case IPV6_PKTINFO: 1903 case IPV6_HOPOPTS: 1904 case IPV6_RTHDR: 1905 case IPV6_DSTOPTS: 1906 case IPV6_RTHDRDSTOPTS: 1907 case IPV6_NEXTHOP: 1908 case IPV6_OTCLASS: 1909 case IPV6_TCLASS: 1910 case IPV6_DONTFRAG: 1911 case IPV6_USE_MIN_MTU: 1912 case IPV6_PREFER_TEMPADDR: 1913 error = ip6_getpcbopt(in6p->in6p_outputopts, 1914 optname, sopt); 1915 break; 1916 1917 case IPV6_MULTICAST_IF: 1918 case IPV6_MULTICAST_HOPS: 1919 case IPV6_MULTICAST_LOOP: 1920 case IPV6_JOIN_GROUP: 1921 case IPV6_LEAVE_GROUP: 1922 error = ip6_getmoptions(sopt, in6p); 1923 break; 1924 1925 case IPV6_PORTALGO: 1926 optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; 1927 error = sockopt_setint(sopt, optval); 1928 break; 1929 1930 #if defined(IPSEC) 1931 case IPV6_IPSEC_POLICY: 1932 if (ipsec_used) { 1933 struct mbuf *m = NULL; 1934 1935 /* 1936 * XXX: this will return EINVAL as sopt is 1937 * empty 1938 */ 1939 error = ipsec_get_policy(in6p, sopt->sopt_data, 1940 sopt->sopt_size, &m); 1941 if (!error) 1942 error = sockopt_setmbuf(sopt, m); 1943 } else 1944 error = ENOPROTOOPT; 1945 break; 1946 #endif /* IPSEC */ 1947 1948 default: 1949 error = ENOPROTOOPT; 1950 break; 1951 } 1952 break; 1953 } 1954 return (error); 1955 } 1956 1957 int 1958 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1959 { 1960 int error = 0, optval; 1961 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1962 struct in6pcb *in6p = sotoin6pcb(so); 1963 int level, optname; 1964 1965 KASSERT(sopt != NULL); 1966 1967 level = sopt->sopt_level; 1968 optname = sopt->sopt_name; 1969 1970 if (level != IPPROTO_IPV6) { 1971 return ENOPROTOOPT; 1972 } 1973 1974 switch (optname) { 1975 case IPV6_CHECKSUM: 1976 /* 1977 * For ICMPv6 sockets, no modification allowed for checksum 1978 * offset, permit "no change" values to help existing apps. 1979 * 1980 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 1981 * for an ICMPv6 socket will fail." The current 1982 * behavior does not meet RFC3542. 1983 */ 1984 switch (op) { 1985 case PRCO_SETOPT: 1986 error = sockopt_getint(sopt, &optval); 1987 if (error) 1988 break; 1989 if ((optval % 2) != 0) { 1990 /* the API assumes even offset values */ 1991 error = EINVAL; 1992 } else if (so->so_proto->pr_protocol == 1993 IPPROTO_ICMPV6) { 1994 if (optval != icmp6off) 1995 error = EINVAL; 1996 } else 1997 in6p->in6p_cksum = optval; 1998 break; 1999 2000 case PRCO_GETOPT: 2001 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2002 optval = icmp6off; 2003 else 2004 optval = in6p->in6p_cksum; 2005 2006 error = sockopt_setint(sopt, optval); 2007 break; 2008 2009 default: 2010 error = EINVAL; 2011 break; 2012 } 2013 break; 2014 2015 default: 2016 error = ENOPROTOOPT; 2017 break; 2018 } 2019 2020 return (error); 2021 } 2022 2023 #ifdef RFC2292 2024 /* 2025 * Set up IP6 options in pcb for insertion in output packets or 2026 * specifying behavior of outgoing packets. 2027 */ 2028 static int 2029 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 2030 struct sockopt *sopt) 2031 { 2032 struct ip6_pktopts *opt = *pktopt; 2033 struct mbuf *m; 2034 int error = 0; 2035 2036 KASSERT(solocked(so)); 2037 2038 /* turn off any old options. */ 2039 if (opt) { 2040 #ifdef DIAGNOSTIC 2041 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2042 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2043 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2044 printf("ip6_pcbopts: all specified options are cleared.\n"); 2045 #endif 2046 ip6_clearpktopts(opt, -1); 2047 } else { 2048 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2049 if (opt == NULL) 2050 return (ENOBUFS); 2051 } 2052 *pktopt = NULL; 2053 2054 if (sopt == NULL || sopt->sopt_size == 0) { 2055 /* 2056 * Only turning off any previous options, regardless of 2057 * whether the opt is just created or given. 2058 */ 2059 free(opt, M_IP6OPT); 2060 return (0); 2061 } 2062 2063 /* set options specified by user. */ 2064 m = sockopt_getmbuf(sopt); 2065 if (m == NULL) { 2066 free(opt, M_IP6OPT); 2067 return (ENOBUFS); 2068 } 2069 2070 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2071 so->so_proto->pr_protocol); 2072 m_freem(m); 2073 if (error != 0) { 2074 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2075 free(opt, M_IP6OPT); 2076 return (error); 2077 } 2078 *pktopt = opt; 2079 return (0); 2080 } 2081 #endif 2082 2083 /* 2084 * initialize ip6_pktopts. beware that there are non-zero default values in 2085 * the struct. 2086 */ 2087 void 2088 ip6_initpktopts(struct ip6_pktopts *opt) 2089 { 2090 2091 memset(opt, 0, sizeof(*opt)); 2092 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2093 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2094 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2095 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2096 } 2097 2098 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2099 static int 2100 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2101 kauth_cred_t cred, int uproto) 2102 { 2103 struct ip6_pktopts *opt; 2104 2105 if (*pktopt == NULL) { 2106 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2107 M_NOWAIT); 2108 if (*pktopt == NULL) 2109 return (ENOBUFS); 2110 2111 ip6_initpktopts(*pktopt); 2112 } 2113 opt = *pktopt; 2114 2115 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2116 } 2117 2118 static int 2119 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2120 { 2121 void *optdata = NULL; 2122 int optdatalen = 0; 2123 struct ip6_ext *ip6e; 2124 int error = 0; 2125 struct in6_pktinfo null_pktinfo; 2126 int deftclass = 0, on; 2127 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2128 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2129 2130 switch (optname) { 2131 case IPV6_PKTINFO: 2132 if (pktopt && pktopt->ip6po_pktinfo) 2133 optdata = (void *)pktopt->ip6po_pktinfo; 2134 else { 2135 /* XXX: we don't have to do this every time... */ 2136 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2137 optdata = (void *)&null_pktinfo; 2138 } 2139 optdatalen = sizeof(struct in6_pktinfo); 2140 break; 2141 case IPV6_OTCLASS: 2142 /* XXX */ 2143 return (EINVAL); 2144 case IPV6_TCLASS: 2145 if (pktopt && pktopt->ip6po_tclass >= 0) 2146 optdata = (void *)&pktopt->ip6po_tclass; 2147 else 2148 optdata = (void *)&deftclass; 2149 optdatalen = sizeof(int); 2150 break; 2151 case IPV6_HOPOPTS: 2152 if (pktopt && pktopt->ip6po_hbh) { 2153 optdata = (void *)pktopt->ip6po_hbh; 2154 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2155 optdatalen = (ip6e->ip6e_len + 1) << 3; 2156 } 2157 break; 2158 case IPV6_RTHDR: 2159 if (pktopt && pktopt->ip6po_rthdr) { 2160 optdata = (void *)pktopt->ip6po_rthdr; 2161 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2162 optdatalen = (ip6e->ip6e_len + 1) << 3; 2163 } 2164 break; 2165 case IPV6_RTHDRDSTOPTS: 2166 if (pktopt && pktopt->ip6po_dest1) { 2167 optdata = (void *)pktopt->ip6po_dest1; 2168 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2169 optdatalen = (ip6e->ip6e_len + 1) << 3; 2170 } 2171 break; 2172 case IPV6_DSTOPTS: 2173 if (pktopt && pktopt->ip6po_dest2) { 2174 optdata = (void *)pktopt->ip6po_dest2; 2175 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2176 optdatalen = (ip6e->ip6e_len + 1) << 3; 2177 } 2178 break; 2179 case IPV6_NEXTHOP: 2180 if (pktopt && pktopt->ip6po_nexthop) { 2181 optdata = (void *)pktopt->ip6po_nexthop; 2182 optdatalen = pktopt->ip6po_nexthop->sa_len; 2183 } 2184 break; 2185 case IPV6_USE_MIN_MTU: 2186 if (pktopt) 2187 optdata = (void *)&pktopt->ip6po_minmtu; 2188 else 2189 optdata = (void *)&defminmtu; 2190 optdatalen = sizeof(int); 2191 break; 2192 case IPV6_DONTFRAG: 2193 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2194 on = 1; 2195 else 2196 on = 0; 2197 optdata = (void *)&on; 2198 optdatalen = sizeof(on); 2199 break; 2200 case IPV6_PREFER_TEMPADDR: 2201 if (pktopt) 2202 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2203 else 2204 optdata = (void *)&defpreftemp; 2205 optdatalen = sizeof(int); 2206 break; 2207 default: /* should not happen */ 2208 #ifdef DIAGNOSTIC 2209 panic("ip6_getpcbopt: unexpected option\n"); 2210 #endif 2211 return (ENOPROTOOPT); 2212 } 2213 2214 error = sockopt_set(sopt, optdata, optdatalen); 2215 2216 return (error); 2217 } 2218 2219 void 2220 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2221 { 2222 if (optname == -1 || optname == IPV6_PKTINFO) { 2223 if (pktopt->ip6po_pktinfo) 2224 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2225 pktopt->ip6po_pktinfo = NULL; 2226 } 2227 if (optname == -1 || optname == IPV6_HOPLIMIT) 2228 pktopt->ip6po_hlim = -1; 2229 if (optname == -1 || optname == IPV6_TCLASS) 2230 pktopt->ip6po_tclass = -1; 2231 if (optname == -1 || optname == IPV6_NEXTHOP) { 2232 rtcache_free(&pktopt->ip6po_nextroute); 2233 if (pktopt->ip6po_nexthop) 2234 free(pktopt->ip6po_nexthop, M_IP6OPT); 2235 pktopt->ip6po_nexthop = NULL; 2236 } 2237 if (optname == -1 || optname == IPV6_HOPOPTS) { 2238 if (pktopt->ip6po_hbh) 2239 free(pktopt->ip6po_hbh, M_IP6OPT); 2240 pktopt->ip6po_hbh = NULL; 2241 } 2242 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2243 if (pktopt->ip6po_dest1) 2244 free(pktopt->ip6po_dest1, M_IP6OPT); 2245 pktopt->ip6po_dest1 = NULL; 2246 } 2247 if (optname == -1 || optname == IPV6_RTHDR) { 2248 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2249 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2250 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2251 rtcache_free(&pktopt->ip6po_route); 2252 } 2253 if (optname == -1 || optname == IPV6_DSTOPTS) { 2254 if (pktopt->ip6po_dest2) 2255 free(pktopt->ip6po_dest2, M_IP6OPT); 2256 pktopt->ip6po_dest2 = NULL; 2257 } 2258 } 2259 2260 #define PKTOPT_EXTHDRCPY(type) \ 2261 do { \ 2262 if (src->type) { \ 2263 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2264 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2265 if (dst->type == NULL) \ 2266 goto bad; \ 2267 memcpy(dst->type, src->type, hlen); \ 2268 } \ 2269 } while (/*CONSTCOND*/ 0) 2270 2271 static int 2272 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2273 { 2274 dst->ip6po_hlim = src->ip6po_hlim; 2275 dst->ip6po_tclass = src->ip6po_tclass; 2276 dst->ip6po_flags = src->ip6po_flags; 2277 dst->ip6po_minmtu = src->ip6po_minmtu; 2278 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2279 if (src->ip6po_pktinfo) { 2280 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2281 M_IP6OPT, canwait); 2282 if (dst->ip6po_pktinfo == NULL) 2283 goto bad; 2284 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2285 } 2286 if (src->ip6po_nexthop) { 2287 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2288 M_IP6OPT, canwait); 2289 if (dst->ip6po_nexthop == NULL) 2290 goto bad; 2291 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2292 src->ip6po_nexthop->sa_len); 2293 } 2294 PKTOPT_EXTHDRCPY(ip6po_hbh); 2295 PKTOPT_EXTHDRCPY(ip6po_dest1); 2296 PKTOPT_EXTHDRCPY(ip6po_dest2); 2297 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2298 return (0); 2299 2300 bad: 2301 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2302 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2303 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2304 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2305 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2306 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2307 2308 return (ENOBUFS); 2309 } 2310 #undef PKTOPT_EXTHDRCPY 2311 2312 struct ip6_pktopts * 2313 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2314 { 2315 int error; 2316 struct ip6_pktopts *dst; 2317 2318 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2319 if (dst == NULL) 2320 return (NULL); 2321 ip6_initpktopts(dst); 2322 2323 if ((error = copypktopts(dst, src, canwait)) != 0) { 2324 free(dst, M_IP6OPT); 2325 return (NULL); 2326 } 2327 2328 return (dst); 2329 } 2330 2331 void 2332 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2333 { 2334 if (pktopt == NULL) 2335 return; 2336 2337 ip6_clearpktopts(pktopt, -1); 2338 2339 free(pktopt, M_IP6OPT); 2340 } 2341 2342 int 2343 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, 2344 struct psref *psref, void *v, size_t l) 2345 { 2346 struct ipv6_mreq mreq; 2347 int error; 2348 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2349 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2350 2351 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2352 if (error != 0) 2353 return error; 2354 2355 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2356 /* 2357 * We use the unspecified address to specify to accept 2358 * all multicast addresses. Only super user is allowed 2359 * to do this. 2360 */ 2361 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, 2362 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2363 return EACCES; 2364 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2365 // Don't bother if we are not going to use ifp. 2366 if (l == sizeof(*ia)) { 2367 memcpy(v, ia, l); 2368 return 0; 2369 } 2370 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2371 return EINVAL; 2372 } 2373 2374 /* 2375 * If no interface was explicitly specified, choose an 2376 * appropriate one according to the given multicast address. 2377 */ 2378 if (mreq.ipv6mr_interface == 0) { 2379 struct rtentry *rt; 2380 union { 2381 struct sockaddr dst; 2382 struct sockaddr_in dst4; 2383 struct sockaddr_in6 dst6; 2384 } u; 2385 struct route ro; 2386 2387 /* 2388 * Look up the routing table for the 2389 * address, and choose the outgoing interface. 2390 * XXX: is it a good approach? 2391 */ 2392 memset(&ro, 0, sizeof(ro)); 2393 if (IN6_IS_ADDR_V4MAPPED(ia)) 2394 sockaddr_in_init(&u.dst4, ia4, 0); 2395 else 2396 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2397 error = rtcache_setdst(&ro, &u.dst); 2398 if (error != 0) 2399 return error; 2400 rt = rtcache_init(&ro); 2401 *ifp = rt != NULL ? 2402 if_get_byindex(rt->rt_ifp->if_index, psref) : NULL; 2403 rtcache_unref(rt, &ro); 2404 rtcache_free(&ro); 2405 } else { 2406 /* 2407 * If the interface is specified, validate it. 2408 */ 2409 *ifp = if_get_byindex(mreq.ipv6mr_interface, psref); 2410 if (*ifp == NULL) 2411 return ENXIO; /* XXX EINVAL? */ 2412 } 2413 if (sizeof(*ia) == l) 2414 memcpy(v, ia, l); 2415 else 2416 memcpy(v, ia4, l); 2417 return 0; 2418 } 2419 2420 /* 2421 * Set the IP6 multicast options in response to user setsockopt(). 2422 */ 2423 static int 2424 ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) 2425 { 2426 int error = 0; 2427 u_int loop, ifindex; 2428 struct ipv6_mreq mreq; 2429 struct in6_addr ia; 2430 struct ifnet *ifp; 2431 struct ip6_moptions *im6o = in6p->in6p_moptions; 2432 struct in6_multi_mship *imm; 2433 2434 KASSERT(in6p_locked(in6p)); 2435 2436 if (im6o == NULL) { 2437 /* 2438 * No multicast option buffer attached to the pcb; 2439 * allocate one and initialize to default values. 2440 */ 2441 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2442 if (im6o == NULL) 2443 return (ENOBUFS); 2444 in6p->in6p_moptions = im6o; 2445 im6o->im6o_multicast_if_index = 0; 2446 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2447 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2448 LIST_INIT(&im6o->im6o_memberships); 2449 } 2450 2451 switch (sopt->sopt_name) { 2452 2453 case IPV6_MULTICAST_IF: { 2454 int s; 2455 /* 2456 * Select the interface for outgoing multicast packets. 2457 */ 2458 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2459 if (error != 0) 2460 break; 2461 2462 s = pserialize_read_enter(); 2463 if (ifindex != 0) { 2464 if ((ifp = if_byindex(ifindex)) == NULL) { 2465 pserialize_read_exit(s); 2466 error = ENXIO; /* XXX EINVAL? */ 2467 break; 2468 } 2469 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2470 pserialize_read_exit(s); 2471 error = EADDRNOTAVAIL; 2472 break; 2473 } 2474 } else 2475 ifp = NULL; 2476 im6o->im6o_multicast_if_index = if_get_index(ifp); 2477 pserialize_read_exit(s); 2478 break; 2479 } 2480 2481 case IPV6_MULTICAST_HOPS: 2482 { 2483 /* 2484 * Set the IP6 hoplimit for outgoing multicast packets. 2485 */ 2486 int optval; 2487 2488 error = sockopt_getint(sopt, &optval); 2489 if (error != 0) 2490 break; 2491 2492 if (optval < -1 || optval >= 256) 2493 error = EINVAL; 2494 else if (optval == -1) 2495 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2496 else 2497 im6o->im6o_multicast_hlim = optval; 2498 break; 2499 } 2500 2501 case IPV6_MULTICAST_LOOP: 2502 /* 2503 * Set the loopback flag for outgoing multicast packets. 2504 * Must be zero or one. 2505 */ 2506 error = sockopt_get(sopt, &loop, sizeof(loop)); 2507 if (error != 0) 2508 break; 2509 if (loop > 1) { 2510 error = EINVAL; 2511 break; 2512 } 2513 im6o->im6o_multicast_loop = loop; 2514 break; 2515 2516 case IPV6_JOIN_GROUP: { 2517 int bound; 2518 struct psref psref; 2519 /* 2520 * Add a multicast group membership. 2521 * Group must be a valid IP6 multicast address. 2522 */ 2523 bound = curlwp_bind(); 2524 ifp = NULL; 2525 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 2526 if (error != 0) { 2527 KASSERT(ifp == NULL); 2528 curlwp_bindx(bound); 2529 return error; 2530 } 2531 2532 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2533 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2534 goto put_break; 2535 } 2536 /* 2537 * See if we found an interface, and confirm that it 2538 * supports multicast 2539 */ 2540 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2541 error = EADDRNOTAVAIL; 2542 goto put_break; 2543 } 2544 2545 if (in6_setscope(&ia, ifp, NULL)) { 2546 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2547 goto put_break; 2548 } 2549 2550 /* 2551 * See if the membership already exists. 2552 */ 2553 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2554 if (imm->i6mm_maddr->in6m_ifp == ifp && 2555 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2556 &ia)) 2557 goto put_break; 2558 } 2559 if (imm != NULL) { 2560 error = EADDRINUSE; 2561 goto put_break; 2562 } 2563 /* 2564 * Everything looks good; add a new record to the multicast 2565 * address list for the given interface. 2566 */ 2567 imm = in6_joingroup(ifp, &ia, &error, 0); 2568 if (imm == NULL) 2569 goto put_break; 2570 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2571 put_break: 2572 if_put(ifp, &psref); 2573 curlwp_bindx(bound); 2574 break; 2575 } 2576 2577 case IPV6_LEAVE_GROUP: { 2578 /* 2579 * Drop a multicast group membership. 2580 * Group must be a valid IP6 multicast address. 2581 */ 2582 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2583 if (error != 0) 2584 break; 2585 2586 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2587 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2588 break; 2589 } 2590 /* 2591 * If an interface address was specified, get a pointer 2592 * to its ifnet structure. 2593 */ 2594 if (mreq.ipv6mr_interface != 0) { 2595 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2596 error = ENXIO; /* XXX EINVAL? */ 2597 break; 2598 } 2599 } else 2600 ifp = NULL; 2601 2602 /* Fill in the scope zone ID */ 2603 if (ifp) { 2604 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2605 /* XXX: should not happen */ 2606 error = EADDRNOTAVAIL; 2607 break; 2608 } 2609 } else if (mreq.ipv6mr_interface != 0) { 2610 /* 2611 * XXX: This case would happens when the (positive) 2612 * index is in the valid range, but the corresponding 2613 * interface has been detached dynamically. The above 2614 * check probably avoids such case to happen here, but 2615 * we check it explicitly for safety. 2616 */ 2617 error = EADDRNOTAVAIL; 2618 break; 2619 } else { /* ipv6mr_interface == 0 */ 2620 struct sockaddr_in6 sa6_mc; 2621 2622 /* 2623 * The API spec says as follows: 2624 * If the interface index is specified as 0, the 2625 * system may choose a multicast group membership to 2626 * drop by matching the multicast address only. 2627 * On the other hand, we cannot disambiguate the scope 2628 * zone unless an interface is provided. Thus, we 2629 * check if there's ambiguity with the default scope 2630 * zone as the last resort. 2631 */ 2632 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2633 0, 0, 0); 2634 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2635 if (error != 0) 2636 break; 2637 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2638 } 2639 2640 /* 2641 * Find the membership in the membership list. 2642 */ 2643 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2644 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2645 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2646 &mreq.ipv6mr_multiaddr)) 2647 break; 2648 } 2649 if (imm == NULL) { 2650 /* Unable to resolve interface */ 2651 error = EADDRNOTAVAIL; 2652 break; 2653 } 2654 /* 2655 * Give up the multicast address record to which the 2656 * membership points. 2657 */ 2658 LIST_REMOVE(imm, i6mm_chain); 2659 in6_leavegroup(imm); 2660 /* in6m_ifp should not leave thanks to in6p_lock */ 2661 break; 2662 } 2663 2664 default: 2665 error = EOPNOTSUPP; 2666 break; 2667 } 2668 2669 /* 2670 * If all options have default values, no need to keep the mbuf. 2671 */ 2672 if (im6o->im6o_multicast_if_index == 0 && 2673 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2674 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2675 LIST_EMPTY(&im6o->im6o_memberships)) { 2676 free(in6p->in6p_moptions, M_IPMOPTS); 2677 in6p->in6p_moptions = NULL; 2678 } 2679 2680 return (error); 2681 } 2682 2683 /* 2684 * Return the IP6 multicast options in response to user getsockopt(). 2685 */ 2686 static int 2687 ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p) 2688 { 2689 u_int optval; 2690 int error; 2691 struct ip6_moptions *im6o = in6p->in6p_moptions; 2692 2693 switch (sopt->sopt_name) { 2694 case IPV6_MULTICAST_IF: 2695 if (im6o == NULL || im6o->im6o_multicast_if_index == 0) 2696 optval = 0; 2697 else 2698 optval = im6o->im6o_multicast_if_index; 2699 2700 error = sockopt_set(sopt, &optval, sizeof(optval)); 2701 break; 2702 2703 case IPV6_MULTICAST_HOPS: 2704 if (im6o == NULL) 2705 optval = ip6_defmcasthlim; 2706 else 2707 optval = im6o->im6o_multicast_hlim; 2708 2709 error = sockopt_set(sopt, &optval, sizeof(optval)); 2710 break; 2711 2712 case IPV6_MULTICAST_LOOP: 2713 if (im6o == NULL) 2714 optval = IPV6_DEFAULT_MULTICAST_LOOP; 2715 else 2716 optval = im6o->im6o_multicast_loop; 2717 2718 error = sockopt_set(sopt, &optval, sizeof(optval)); 2719 break; 2720 2721 default: 2722 error = EOPNOTSUPP; 2723 } 2724 2725 return (error); 2726 } 2727 2728 /* 2729 * Discard the IP6 multicast options. 2730 */ 2731 void 2732 ip6_freemoptions(struct ip6_moptions *im6o) 2733 { 2734 struct in6_multi_mship *imm, *nimm; 2735 2736 if (im6o == NULL) 2737 return; 2738 2739 /* The owner of im6o (in6p) should be protected by solock */ 2740 LIST_FOREACH_SAFE(imm, &im6o->im6o_memberships, i6mm_chain, nimm) { 2741 LIST_REMOVE(imm, i6mm_chain); 2742 in6_leavegroup(imm); 2743 } 2744 free(im6o, M_IPMOPTS); 2745 } 2746 2747 /* 2748 * Set IPv6 outgoing packet options based on advanced API. 2749 */ 2750 int 2751 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2752 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2753 { 2754 struct cmsghdr *cm = 0; 2755 2756 if (control == NULL || opt == NULL) 2757 return (EINVAL); 2758 2759 ip6_initpktopts(opt); 2760 if (stickyopt) { 2761 int error; 2762 2763 /* 2764 * If stickyopt is provided, make a local copy of the options 2765 * for this particular packet, then override them by ancillary 2766 * objects. 2767 * XXX: copypktopts() does not copy the cached route to a next 2768 * hop (if any). This is not very good in terms of efficiency, 2769 * but we can allow this since this option should be rarely 2770 * used. 2771 */ 2772 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2773 return (error); 2774 } 2775 2776 /* 2777 * XXX: Currently, we assume all the optional information is stored 2778 * in a single mbuf. 2779 */ 2780 if (control->m_next) 2781 return (EINVAL); 2782 2783 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2784 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2785 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2786 int error; 2787 2788 if (control->m_len < CMSG_LEN(0)) 2789 return (EINVAL); 2790 2791 cm = mtod(control, struct cmsghdr *); 2792 if (cm->cmsg_len < CMSG_LEN(0) || cm->cmsg_len > control->m_len) 2793 return (EINVAL); 2794 if (cm->cmsg_level != IPPROTO_IPV6) 2795 continue; 2796 2797 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2798 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2799 if (error) 2800 return (error); 2801 } 2802 2803 return (0); 2804 } 2805 2806 /* 2807 * Set a particular packet option, as a sticky option or an ancillary data 2808 * item. "len" can be 0 only when it's a sticky option. 2809 * We have 4 cases of combination of "sticky" and "cmsg": 2810 * "sticky=0, cmsg=0": impossible 2811 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2812 * "sticky=1, cmsg=0": RFC3542 socket option 2813 * "sticky=1, cmsg=1": RFC2292 socket option 2814 */ 2815 static int 2816 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2817 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2818 { 2819 int minmtupolicy; 2820 int error; 2821 2822 if (!sticky && !cmsg) { 2823 #ifdef DIAGNOSTIC 2824 printf("ip6_setpktopt: impossible case\n"); 2825 #endif 2826 return (EINVAL); 2827 } 2828 2829 /* 2830 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2831 * not be specified in the context of RFC3542. Conversely, 2832 * RFC3542 types should not be specified in the context of RFC2292. 2833 */ 2834 if (!cmsg) { 2835 switch (optname) { 2836 case IPV6_2292PKTINFO: 2837 case IPV6_2292HOPLIMIT: 2838 case IPV6_2292NEXTHOP: 2839 case IPV6_2292HOPOPTS: 2840 case IPV6_2292DSTOPTS: 2841 case IPV6_2292RTHDR: 2842 case IPV6_2292PKTOPTIONS: 2843 return (ENOPROTOOPT); 2844 } 2845 } 2846 if (sticky && cmsg) { 2847 switch (optname) { 2848 case IPV6_PKTINFO: 2849 case IPV6_HOPLIMIT: 2850 case IPV6_NEXTHOP: 2851 case IPV6_HOPOPTS: 2852 case IPV6_DSTOPTS: 2853 case IPV6_RTHDRDSTOPTS: 2854 case IPV6_RTHDR: 2855 case IPV6_USE_MIN_MTU: 2856 case IPV6_DONTFRAG: 2857 case IPV6_OTCLASS: 2858 case IPV6_TCLASS: 2859 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2860 return (ENOPROTOOPT); 2861 } 2862 } 2863 2864 switch (optname) { 2865 #ifdef RFC2292 2866 case IPV6_2292PKTINFO: 2867 #endif 2868 case IPV6_PKTINFO: 2869 { 2870 struct in6_pktinfo *pktinfo; 2871 2872 if (len != sizeof(struct in6_pktinfo)) 2873 return (EINVAL); 2874 2875 pktinfo = (struct in6_pktinfo *)buf; 2876 2877 /* 2878 * An application can clear any sticky IPV6_PKTINFO option by 2879 * doing a "regular" setsockopt with ipi6_addr being 2880 * in6addr_any and ipi6_ifindex being zero. 2881 * [RFC 3542, Section 6] 2882 */ 2883 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2884 pktinfo->ipi6_ifindex == 0 && 2885 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2886 ip6_clearpktopts(opt, optname); 2887 break; 2888 } 2889 2890 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2891 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2892 return (EINVAL); 2893 } 2894 2895 /* Validate the interface index if specified. */ 2896 if (pktinfo->ipi6_ifindex) { 2897 struct ifnet *ifp; 2898 int s = pserialize_read_enter(); 2899 ifp = if_byindex(pktinfo->ipi6_ifindex); 2900 if (ifp == NULL) { 2901 pserialize_read_exit(s); 2902 return ENXIO; 2903 } 2904 pserialize_read_exit(s); 2905 } 2906 2907 /* 2908 * We store the address anyway, and let in6_selectsrc() 2909 * validate the specified address. This is because ipi6_addr 2910 * may not have enough information about its scope zone, and 2911 * we may need additional information (such as outgoing 2912 * interface or the scope zone of a destination address) to 2913 * disambiguate the scope. 2914 * XXX: the delay of the validation may confuse the 2915 * application when it is used as a sticky option. 2916 */ 2917 if (opt->ip6po_pktinfo == NULL) { 2918 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2919 M_IP6OPT, M_NOWAIT); 2920 if (opt->ip6po_pktinfo == NULL) 2921 return (ENOBUFS); 2922 } 2923 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2924 break; 2925 } 2926 2927 #ifdef RFC2292 2928 case IPV6_2292HOPLIMIT: 2929 #endif 2930 case IPV6_HOPLIMIT: 2931 { 2932 int *hlimp; 2933 2934 /* 2935 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2936 * to simplify the ordering among hoplimit options. 2937 */ 2938 if (optname == IPV6_HOPLIMIT && sticky) 2939 return (ENOPROTOOPT); 2940 2941 if (len != sizeof(int)) 2942 return (EINVAL); 2943 hlimp = (int *)buf; 2944 if (*hlimp < -1 || *hlimp > 255) 2945 return (EINVAL); 2946 2947 opt->ip6po_hlim = *hlimp; 2948 break; 2949 } 2950 2951 case IPV6_OTCLASS: 2952 if (len != sizeof(u_int8_t)) 2953 return (EINVAL); 2954 2955 opt->ip6po_tclass = *(u_int8_t *)buf; 2956 break; 2957 2958 case IPV6_TCLASS: 2959 { 2960 int tclass; 2961 2962 if (len != sizeof(int)) 2963 return (EINVAL); 2964 tclass = *(int *)buf; 2965 if (tclass < -1 || tclass > 255) 2966 return (EINVAL); 2967 2968 opt->ip6po_tclass = tclass; 2969 break; 2970 } 2971 2972 #ifdef RFC2292 2973 case IPV6_2292NEXTHOP: 2974 #endif 2975 case IPV6_NEXTHOP: 2976 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2977 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2978 if (error) 2979 return (error); 2980 2981 if (len == 0) { /* just remove the option */ 2982 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2983 break; 2984 } 2985 2986 /* check if cmsg_len is large enough for sa_len */ 2987 if (len < sizeof(struct sockaddr) || len < *buf) 2988 return (EINVAL); 2989 2990 switch (((struct sockaddr *)buf)->sa_family) { 2991 case AF_INET6: 2992 { 2993 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2994 2995 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2996 return (EINVAL); 2997 2998 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2999 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3000 return (EINVAL); 3001 } 3002 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3003 != 0) { 3004 return (error); 3005 } 3006 break; 3007 } 3008 case AF_LINK: /* eventually be supported? */ 3009 default: 3010 return (EAFNOSUPPORT); 3011 } 3012 3013 /* turn off the previous option, then set the new option. */ 3014 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3015 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3016 if (opt->ip6po_nexthop == NULL) 3017 return (ENOBUFS); 3018 memcpy(opt->ip6po_nexthop, buf, *buf); 3019 break; 3020 3021 #ifdef RFC2292 3022 case IPV6_2292HOPOPTS: 3023 #endif 3024 case IPV6_HOPOPTS: 3025 { 3026 struct ip6_hbh *hbh; 3027 int hbhlen; 3028 3029 /* 3030 * XXX: We don't allow a non-privileged user to set ANY HbH 3031 * options, since per-option restriction has too much 3032 * overhead. 3033 */ 3034 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 3035 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3036 if (error) 3037 return (error); 3038 3039 if (len == 0) { 3040 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3041 break; /* just remove the option */ 3042 } 3043 3044 /* message length validation */ 3045 if (len < sizeof(struct ip6_hbh)) 3046 return (EINVAL); 3047 hbh = (struct ip6_hbh *)buf; 3048 hbhlen = (hbh->ip6h_len + 1) << 3; 3049 if (len != hbhlen) 3050 return (EINVAL); 3051 3052 /* turn off the previous option, then set the new option. */ 3053 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3054 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3055 if (opt->ip6po_hbh == NULL) 3056 return (ENOBUFS); 3057 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3058 3059 break; 3060 } 3061 3062 #ifdef RFC2292 3063 case IPV6_2292DSTOPTS: 3064 #endif 3065 case IPV6_DSTOPTS: 3066 case IPV6_RTHDRDSTOPTS: 3067 { 3068 struct ip6_dest *dest, **newdest = NULL; 3069 int destlen; 3070 3071 /* XXX: see the comment for IPV6_HOPOPTS */ 3072 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 3073 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3074 if (error) 3075 return (error); 3076 3077 if (len == 0) { 3078 ip6_clearpktopts(opt, optname); 3079 break; /* just remove the option */ 3080 } 3081 3082 /* message length validation */ 3083 if (len < sizeof(struct ip6_dest)) 3084 return (EINVAL); 3085 dest = (struct ip6_dest *)buf; 3086 destlen = (dest->ip6d_len + 1) << 3; 3087 if (len != destlen) 3088 return (EINVAL); 3089 /* 3090 * Determine the position that the destination options header 3091 * should be inserted; before or after the routing header. 3092 */ 3093 switch (optname) { 3094 case IPV6_2292DSTOPTS: 3095 /* 3096 * The old advanced API is ambiguous on this point. 3097 * Our approach is to determine the position based 3098 * according to the existence of a routing header. 3099 * Note, however, that this depends on the order of the 3100 * extension headers in the ancillary data; the 1st 3101 * part of the destination options header must appear 3102 * before the routing header in the ancillary data, 3103 * too. 3104 * RFC3542 solved the ambiguity by introducing 3105 * separate ancillary data or option types. 3106 */ 3107 if (opt->ip6po_rthdr == NULL) 3108 newdest = &opt->ip6po_dest1; 3109 else 3110 newdest = &opt->ip6po_dest2; 3111 break; 3112 case IPV6_RTHDRDSTOPTS: 3113 newdest = &opt->ip6po_dest1; 3114 break; 3115 case IPV6_DSTOPTS: 3116 newdest = &opt->ip6po_dest2; 3117 break; 3118 } 3119 3120 /* turn off the previous option, then set the new option. */ 3121 ip6_clearpktopts(opt, optname); 3122 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3123 if (*newdest == NULL) 3124 return (ENOBUFS); 3125 memcpy(*newdest, dest, destlen); 3126 3127 break; 3128 } 3129 3130 #ifdef RFC2292 3131 case IPV6_2292RTHDR: 3132 #endif 3133 case IPV6_RTHDR: 3134 { 3135 struct ip6_rthdr *rth; 3136 int rthlen; 3137 3138 if (len == 0) { 3139 ip6_clearpktopts(opt, IPV6_RTHDR); 3140 break; /* just remove the option */ 3141 } 3142 3143 /* message length validation */ 3144 if (len < sizeof(struct ip6_rthdr)) 3145 return (EINVAL); 3146 rth = (struct ip6_rthdr *)buf; 3147 rthlen = (rth->ip6r_len + 1) << 3; 3148 if (len != rthlen) 3149 return (EINVAL); 3150 switch (rth->ip6r_type) { 3151 case IPV6_RTHDR_TYPE_0: 3152 /* Dropped, RFC5095. */ 3153 default: 3154 return (EINVAL); /* not supported */ 3155 } 3156 /* turn off the previous option */ 3157 ip6_clearpktopts(opt, IPV6_RTHDR); 3158 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3159 if (opt->ip6po_rthdr == NULL) 3160 return (ENOBUFS); 3161 memcpy(opt->ip6po_rthdr, rth, rthlen); 3162 break; 3163 } 3164 3165 case IPV6_USE_MIN_MTU: 3166 if (len != sizeof(int)) 3167 return (EINVAL); 3168 minmtupolicy = *(int *)buf; 3169 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3170 minmtupolicy != IP6PO_MINMTU_DISABLE && 3171 minmtupolicy != IP6PO_MINMTU_ALL) { 3172 return (EINVAL); 3173 } 3174 opt->ip6po_minmtu = minmtupolicy; 3175 break; 3176 3177 case IPV6_DONTFRAG: 3178 if (len != sizeof(int)) 3179 return (EINVAL); 3180 3181 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3182 /* 3183 * we ignore this option for TCP sockets. 3184 * (RFC3542 leaves this case unspecified.) 3185 */ 3186 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3187 } else 3188 opt->ip6po_flags |= IP6PO_DONTFRAG; 3189 break; 3190 3191 case IPV6_PREFER_TEMPADDR: 3192 { 3193 int preftemp; 3194 3195 if (len != sizeof(int)) 3196 return (EINVAL); 3197 preftemp = *(int *)buf; 3198 switch (preftemp) { 3199 case IP6PO_TEMPADDR_SYSTEM: 3200 case IP6PO_TEMPADDR_NOTPREFER: 3201 case IP6PO_TEMPADDR_PREFER: 3202 break; 3203 default: 3204 return (EINVAL); 3205 } 3206 opt->ip6po_prefer_tempaddr = preftemp; 3207 break; 3208 } 3209 3210 default: 3211 return (ENOPROTOOPT); 3212 } /* end of switch */ 3213 3214 return (0); 3215 } 3216 3217 /* 3218 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3219 * packet to the input queue of a specified interface. Note that this 3220 * calls the output routine of the loopback "driver", but with an interface 3221 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3222 */ 3223 void 3224 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3225 const struct sockaddr_in6 *dst) 3226 { 3227 struct mbuf *copym; 3228 struct ip6_hdr *ip6; 3229 3230 copym = m_copypacket(m, M_DONTWAIT); 3231 if (copym == NULL) 3232 return; 3233 3234 /* 3235 * Make sure to deep-copy IPv6 header portion in case the data 3236 * is in an mbuf cluster, so that we can safely override the IPv6 3237 * header portion later. 3238 */ 3239 if ((copym->m_flags & M_EXT) != 0 || 3240 copym->m_len < sizeof(struct ip6_hdr)) { 3241 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3242 if (copym == NULL) 3243 return; 3244 } 3245 3246 #ifdef DIAGNOSTIC 3247 if (copym->m_len < sizeof(*ip6)) { 3248 m_freem(copym); 3249 return; 3250 } 3251 #endif 3252 3253 ip6 = mtod(copym, struct ip6_hdr *); 3254 /* 3255 * clear embedded scope identifiers if necessary. 3256 * in6_clearscope will touch the addresses only when necessary. 3257 */ 3258 in6_clearscope(&ip6->ip6_src); 3259 in6_clearscope(&ip6->ip6_dst); 3260 3261 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3262 } 3263 3264 /* 3265 * Chop IPv6 header off from the payload. 3266 */ 3267 static int 3268 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3269 { 3270 struct mbuf *mh; 3271 struct ip6_hdr *ip6; 3272 3273 ip6 = mtod(m, struct ip6_hdr *); 3274 if (m->m_len > sizeof(*ip6)) { 3275 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3276 if (mh == NULL) { 3277 m_freem(m); 3278 return ENOBUFS; 3279 } 3280 m_move_pkthdr(mh, m); 3281 m_align(mh, sizeof(*ip6)); 3282 m->m_len -= sizeof(*ip6); 3283 m->m_data += sizeof(*ip6); 3284 mh->m_next = m; 3285 mh->m_len = sizeof(*ip6); 3286 memcpy(mtod(mh, void *), (void *)ip6, sizeof(*ip6)); 3287 m = mh; 3288 } 3289 exthdrs->ip6e_ip6 = m; 3290 return 0; 3291 } 3292 3293 /* 3294 * Compute IPv6 extension header length. 3295 */ 3296 int 3297 ip6_optlen(struct in6pcb *in6p) 3298 { 3299 int len; 3300 3301 if (!in6p->in6p_outputopts) 3302 return 0; 3303 3304 len = 0; 3305 #define elen(x) \ 3306 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3307 3308 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3309 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3310 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3311 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3312 return len; 3313 #undef elen 3314 } 3315 3316 /* 3317 * Ensure sending address is valid. 3318 * Returns 0 on success, -1 if an error should be sent back or 1 3319 * if the packet could be dropped without error (protocol dependent). 3320 */ 3321 static int 3322 ip6_ifaddrvalid(const struct in6_addr *src, const struct in6_addr *dst) 3323 { 3324 struct sockaddr_in6 sin6; 3325 int s, error; 3326 struct ifaddr *ifa; 3327 struct in6_ifaddr *ia6; 3328 3329 if (IN6_IS_ADDR_UNSPECIFIED(src)) 3330 return 0; 3331 3332 memset(&sin6, 0, sizeof(sin6)); 3333 sin6.sin6_family = AF_INET6; 3334 sin6.sin6_len = sizeof(sin6); 3335 sin6.sin6_addr = *src; 3336 3337 s = pserialize_read_enter(); 3338 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 3339 if ((ia6 = ifatoia6(ifa)) == NULL || 3340 ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) 3341 error = -1; 3342 else if (ia6->ia6_flags & IN6_IFF_TENTATIVE) 3343 error = 1; 3344 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 3345 (sin6.sin6_addr = *dst, ifa_ifwithaddr(sin6tosa(&sin6)) == NULL)) 3346 /* Allow internal traffic to DETACHED addresses */ 3347 error = 1; 3348 else 3349 error = 0; 3350 pserialize_read_exit(s); 3351 3352 return error; 3353 } 3354
Indexes created Wed Oct 01 07:09:59 GMT 2025