ip6_output.c revision 1.231.2.1
1 /* $NetBSD: ip6_output.c,v 1.231.2.1 2023/03/23 12:03:04 martin 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 1.231.2.1 2023/03/23 12:03:04 martin 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 inpcb *); 125 static int ip6_getmoptions(struct sockopt *, struct inpcb *); 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 inpcb *inp, 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, inp, 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 interface 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 inpcb *inp = sotoinpcb(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 = &inp->inp_moptions; 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_outputopts(inp), 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( 1365 kauth_cred_get(), 1366 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1367 NULL, NULL, NULL); 1368 if (error) 1369 break; 1370 /* FALLTHROUGH */ 1371 case IPV6_UNICAST_HOPS: 1372 case IPV6_HOPLIMIT: 1373 case IPV6_FAITH: 1374 1375 case IPV6_RECVPKTINFO: 1376 case IPV6_RECVHOPLIMIT: 1377 case IPV6_RECVRTHDR: 1378 case IPV6_RECVPATHMTU: 1379 case IPV6_RECVTCLASS: 1380 case IPV6_V6ONLY: 1381 case IPV6_BINDANY: 1382 error = sockopt_getint(sopt, &optval); 1383 if (error) 1384 break; 1385 switch (optname) { 1386 case IPV6_UNICAST_HOPS: 1387 if (optval < -1 || optval >= 256) 1388 error = EINVAL; 1389 else { 1390 /* -1 = kernel default */ 1391 in6p_hops6(inp) = optval; 1392 } 1393 break; 1394 #define OPTSET(bit) \ 1395 do { \ 1396 if (optval) \ 1397 inp->inp_flags |= (bit); \ 1398 else \ 1399 inp->inp_flags &= ~(bit); \ 1400 } while (/*CONSTCOND*/ 0) 1401 1402 #ifdef RFC2292 1403 #define OPTSET2292(bit) \ 1404 do { \ 1405 inp->inp_flags |= IN6P_RFC2292; \ 1406 if (optval) \ 1407 inp->inp_flags |= (bit); \ 1408 else \ 1409 inp->inp_flags &= ~(bit); \ 1410 } while (/*CONSTCOND*/ 0) 1411 #endif 1412 1413 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0) 1414 1415 case IPV6_RECVPKTINFO: 1416 #ifdef RFC2292 1417 /* cannot mix with RFC2292 */ 1418 if (OPTBIT(IN6P_RFC2292)) { 1419 error = EINVAL; 1420 break; 1421 } 1422 #endif 1423 OPTSET(IN6P_PKTINFO); 1424 break; 1425 1426 case IPV6_HOPLIMIT: 1427 { 1428 struct ip6_pktopts **optp; 1429 1430 #ifdef RFC2292 1431 /* cannot mix with RFC2292 */ 1432 if (OPTBIT(IN6P_RFC2292)) { 1433 error = EINVAL; 1434 break; 1435 } 1436 #endif 1437 optp = &in6p_outputopts(inp); 1438 error = ip6_pcbopt(IPV6_HOPLIMIT, 1439 (u_char *)&optval, 1440 sizeof(optval), 1441 optp, 1442 kauth_cred_get(), uproto); 1443 break; 1444 } 1445 1446 case IPV6_RECVHOPLIMIT: 1447 #ifdef RFC2292 1448 /* cannot mix with RFC2292 */ 1449 if (OPTBIT(IN6P_RFC2292)) { 1450 error = EINVAL; 1451 break; 1452 } 1453 #endif 1454 OPTSET(IN6P_HOPLIMIT); 1455 break; 1456 1457 case IPV6_RECVHOPOPTS: 1458 #ifdef RFC2292 1459 /* cannot mix with RFC2292 */ 1460 if (OPTBIT(IN6P_RFC2292)) { 1461 error = EINVAL; 1462 break; 1463 } 1464 #endif 1465 OPTSET(IN6P_HOPOPTS); 1466 break; 1467 1468 case IPV6_RECVDSTOPTS: 1469 #ifdef RFC2292 1470 /* cannot mix with RFC2292 */ 1471 if (OPTBIT(IN6P_RFC2292)) { 1472 error = EINVAL; 1473 break; 1474 } 1475 #endif 1476 OPTSET(IN6P_DSTOPTS); 1477 break; 1478 1479 case IPV6_RECVRTHDRDSTOPTS: 1480 #ifdef RFC2292 1481 /* cannot mix with RFC2292 */ 1482 if (OPTBIT(IN6P_RFC2292)) { 1483 error = EINVAL; 1484 break; 1485 } 1486 #endif 1487 OPTSET(IN6P_RTHDRDSTOPTS); 1488 break; 1489 1490 case IPV6_RECVRTHDR: 1491 #ifdef RFC2292 1492 /* cannot mix with RFC2292 */ 1493 if (OPTBIT(IN6P_RFC2292)) { 1494 error = EINVAL; 1495 break; 1496 } 1497 #endif 1498 OPTSET(IN6P_RTHDR); 1499 break; 1500 1501 case IPV6_FAITH: 1502 OPTSET(IN6P_FAITH); 1503 break; 1504 1505 case IPV6_RECVPATHMTU: 1506 /* 1507 * We ignore this option for TCP 1508 * sockets. 1509 * (RFC3542 leaves this case 1510 * unspecified.) 1511 */ 1512 if (uproto != IPPROTO_TCP) 1513 OPTSET(IN6P_MTU); 1514 break; 1515 1516 case IPV6_V6ONLY: 1517 /* 1518 * make setsockopt(IPV6_V6ONLY) 1519 * available only prior to bind(2). 1520 * see ipng mailing list, Jun 22 2001. 1521 */ 1522 if (inp->inp_lport || 1523 !IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp))) { 1524 error = EINVAL; 1525 break; 1526 } 1527 #ifdef INET6_BINDV6ONLY 1528 if (!optval) 1529 error = EINVAL; 1530 #else 1531 OPTSET(IN6P_IPV6_V6ONLY); 1532 #endif 1533 break; 1534 1535 case IPV6_RECVTCLASS: 1536 #ifdef RFC2292 1537 /* cannot mix with RFC2292 XXX */ 1538 if (OPTBIT(IN6P_RFC2292)) { 1539 error = EINVAL; 1540 break; 1541 } 1542 #endif 1543 OPTSET(IN6P_TCLASS); 1544 break; 1545 1546 case IPV6_BINDANY: 1547 error = kauth_authorize_network( 1548 kauth_cred_get(), KAUTH_NETWORK_BIND, 1549 KAUTH_REQ_NETWORK_BIND_ANYADDR, so, NULL, 1550 NULL); 1551 if (error) 1552 break; 1553 OPTSET(IN6P_BINDANY); 1554 break; 1555 } 1556 break; 1557 1558 case IPV6_OTCLASS: 1559 { 1560 struct ip6_pktopts **optp; 1561 u_int8_t tclass; 1562 1563 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1564 if (error) 1565 break; 1566 optp = &in6p_outputopts(inp); 1567 error = ip6_pcbopt(optname, 1568 (u_char *)&tclass, 1569 sizeof(tclass), 1570 optp, 1571 kauth_cred_get(), uproto); 1572 break; 1573 } 1574 1575 case IPV6_TCLASS: 1576 case IPV6_DONTFRAG: 1577 case IPV6_USE_MIN_MTU: 1578 case IPV6_PREFER_TEMPADDR: 1579 error = sockopt_getint(sopt, &optval); 1580 if (error) 1581 break; 1582 { 1583 struct ip6_pktopts **optp; 1584 optp = &in6p_outputopts(inp); 1585 error = ip6_pcbopt(optname, 1586 (u_char *)&optval, 1587 sizeof(optval), 1588 optp, 1589 kauth_cred_get(), uproto); 1590 break; 1591 } 1592 1593 #ifdef RFC2292 1594 case IPV6_2292PKTINFO: 1595 case IPV6_2292HOPLIMIT: 1596 case IPV6_2292HOPOPTS: 1597 case IPV6_2292DSTOPTS: 1598 case IPV6_2292RTHDR: 1599 /* RFC 2292 */ 1600 error = sockopt_getint(sopt, &optval); 1601 if (error) 1602 break; 1603 1604 switch (optname) { 1605 case IPV6_2292PKTINFO: 1606 OPTSET2292(IN6P_PKTINFO); 1607 break; 1608 case IPV6_2292HOPLIMIT: 1609 OPTSET2292(IN6P_HOPLIMIT); 1610 break; 1611 case IPV6_2292HOPOPTS: 1612 /* 1613 * Check super-user privilege. 1614 * See comments for IPV6_RECVHOPOPTS. 1615 */ 1616 error = kauth_authorize_network( 1617 kauth_cred_get(), 1618 KAUTH_NETWORK_IPV6, 1619 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1620 NULL, NULL); 1621 if (error) 1622 return (error); 1623 OPTSET2292(IN6P_HOPOPTS); 1624 break; 1625 case IPV6_2292DSTOPTS: 1626 error = kauth_authorize_network( 1627 kauth_cred_get(), 1628 KAUTH_NETWORK_IPV6, 1629 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1630 NULL, NULL); 1631 if (error) 1632 return (error); 1633 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1634 break; 1635 case IPV6_2292RTHDR: 1636 OPTSET2292(IN6P_RTHDR); 1637 break; 1638 } 1639 break; 1640 #endif 1641 case IPV6_PKTINFO: 1642 case IPV6_HOPOPTS: 1643 case IPV6_RTHDR: 1644 case IPV6_DSTOPTS: 1645 case IPV6_RTHDRDSTOPTS: 1646 case IPV6_NEXTHOP: { 1647 /* new advanced API (RFC3542) */ 1648 void *optbuf; 1649 int optbuflen; 1650 struct ip6_pktopts **optp; 1651 1652 #ifdef RFC2292 1653 /* cannot mix with RFC2292 */ 1654 if (OPTBIT(IN6P_RFC2292)) { 1655 error = EINVAL; 1656 break; 1657 } 1658 #endif 1659 1660 optbuflen = sopt->sopt_size; 1661 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1662 if (optbuf == NULL) { 1663 error = ENOBUFS; 1664 break; 1665 } 1666 1667 error = sockopt_get(sopt, optbuf, optbuflen); 1668 if (error) { 1669 free(optbuf, M_IP6OPT); 1670 break; 1671 } 1672 optp = &in6p_outputopts(inp); 1673 error = ip6_pcbopt(optname, optbuf, optbuflen, 1674 optp, kauth_cred_get(), uproto); 1675 1676 free(optbuf, M_IP6OPT); 1677 break; 1678 } 1679 #undef OPTSET 1680 1681 case IPV6_MULTICAST_IF: 1682 case IPV6_MULTICAST_HOPS: 1683 case IPV6_MULTICAST_LOOP: 1684 case IPV6_JOIN_GROUP: 1685 case IPV6_LEAVE_GROUP: 1686 error = ip6_setmoptions(sopt, inp); 1687 break; 1688 1689 case IPV6_PORTRANGE: 1690 error = sockopt_getint(sopt, &optval); 1691 if (error) 1692 break; 1693 1694 switch (optval) { 1695 case IPV6_PORTRANGE_DEFAULT: 1696 inp->inp_flags &= ~(IN6P_LOWPORT); 1697 inp->inp_flags &= ~(IN6P_HIGHPORT); 1698 break; 1699 1700 case IPV6_PORTRANGE_HIGH: 1701 inp->inp_flags &= ~(IN6P_LOWPORT); 1702 inp->inp_flags |= IN6P_HIGHPORT; 1703 break; 1704 1705 case IPV6_PORTRANGE_LOW: 1706 inp->inp_flags &= ~(IN6P_HIGHPORT); 1707 inp->inp_flags |= IN6P_LOWPORT; 1708 break; 1709 1710 default: 1711 error = EINVAL; 1712 break; 1713 } 1714 break; 1715 1716 case IPV6_PORTALGO: 1717 error = sockopt_getint(sopt, &optval); 1718 if (error) 1719 break; 1720 1721 error = portalgo_algo_index_select(inp, optval); 1722 break; 1723 1724 #if defined(IPSEC) 1725 case IPV6_IPSEC_POLICY: 1726 if (ipsec_enabled) { 1727 error = ipsec_set_policy(inp, 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_hops6(inp); 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 = inp->inp_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 = &inp->inp_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_faddr(inp), 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_outputopts(inp), 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, inp); 1923 break; 1924 1925 case IPV6_PORTALGO: 1926 optval = inp->inp_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(inp, 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 inpcb *inp = sotoinpcb(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 < -1 || 1990 (optval > 0 && (optval % 2) != 0)) { 1991 /* 1992 * The API assumes non-negative even offset 1993 * values or -1 as a special value. 1994 */ 1995 error = EINVAL; 1996 } else if (so->so_proto->pr_protocol == 1997 IPPROTO_ICMPV6) { 1998 if (optval != icmp6off) 1999 error = EINVAL; 2000 } else 2001 in6p_cksum(inp) = optval; 2002 break; 2003 2004 case PRCO_GETOPT: 2005 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2006 optval = icmp6off; 2007 else 2008 optval = in6p_cksum(inp); 2009 2010 error = sockopt_setint(sopt, optval); 2011 break; 2012 2013 default: 2014 error = EINVAL; 2015 break; 2016 } 2017 break; 2018 2019 default: 2020 error = ENOPROTOOPT; 2021 break; 2022 } 2023 2024 return (error); 2025 } 2026 2027 #ifdef RFC2292 2028 /* 2029 * Set up IP6 options in pcb for insertion in output packets or 2030 * specifying behavior of outgoing packets. 2031 */ 2032 static int 2033 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 2034 struct sockopt *sopt) 2035 { 2036 struct ip6_pktopts *opt = *pktopt; 2037 struct mbuf *m; 2038 int error = 0; 2039 2040 KASSERT(solocked(so)); 2041 2042 /* turn off any old options. */ 2043 if (opt) { 2044 #ifdef DIAGNOSTIC 2045 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2046 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2047 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2048 printf("ip6_pcbopts: all specified options are cleared.\n"); 2049 #endif 2050 ip6_clearpktopts(opt, -1); 2051 } else { 2052 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2053 if (opt == NULL) 2054 return (ENOBUFS); 2055 } 2056 *pktopt = NULL; 2057 2058 if (sopt == NULL || sopt->sopt_size == 0) { 2059 /* 2060 * Only turning off any previous options, regardless of 2061 * whether the opt is just created or given. 2062 */ 2063 free(opt, M_IP6OPT); 2064 return (0); 2065 } 2066 2067 /* set options specified by user. */ 2068 m = sockopt_getmbuf(sopt); 2069 if (m == NULL) { 2070 free(opt, M_IP6OPT); 2071 return (ENOBUFS); 2072 } 2073 2074 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2075 so->so_proto->pr_protocol); 2076 m_freem(m); 2077 if (error != 0) { 2078 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2079 free(opt, M_IP6OPT); 2080 return (error); 2081 } 2082 *pktopt = opt; 2083 return (0); 2084 } 2085 #endif 2086 2087 /* 2088 * initialize ip6_pktopts. beware that there are non-zero default values in 2089 * the struct. 2090 */ 2091 void 2092 ip6_initpktopts(struct ip6_pktopts *opt) 2093 { 2094 2095 memset(opt, 0, sizeof(*opt)); 2096 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2097 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2098 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2099 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2100 } 2101 2102 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2103 static int 2104 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2105 kauth_cred_t cred, int uproto) 2106 { 2107 struct ip6_pktopts *opt; 2108 2109 if (*pktopt == NULL) { 2110 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2111 M_NOWAIT); 2112 if (*pktopt == NULL) 2113 return (ENOBUFS); 2114 2115 ip6_initpktopts(*pktopt); 2116 } 2117 opt = *pktopt; 2118 2119 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2120 } 2121 2122 static int 2123 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2124 { 2125 void *optdata = NULL; 2126 int optdatalen = 0; 2127 struct ip6_ext *ip6e; 2128 int error = 0; 2129 struct in6_pktinfo null_pktinfo; 2130 int deftclass = 0, on; 2131 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2132 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2133 2134 switch (optname) { 2135 case IPV6_PKTINFO: 2136 if (pktopt && pktopt->ip6po_pktinfo) 2137 optdata = (void *)pktopt->ip6po_pktinfo; 2138 else { 2139 /* XXX: we don't have to do this every time... */ 2140 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2141 optdata = (void *)&null_pktinfo; 2142 } 2143 optdatalen = sizeof(struct in6_pktinfo); 2144 break; 2145 case IPV6_OTCLASS: 2146 /* XXX */ 2147 return (EINVAL); 2148 case IPV6_TCLASS: 2149 if (pktopt && pktopt->ip6po_tclass >= 0) 2150 optdata = (void *)&pktopt->ip6po_tclass; 2151 else 2152 optdata = (void *)&deftclass; 2153 optdatalen = sizeof(int); 2154 break; 2155 case IPV6_HOPOPTS: 2156 if (pktopt && pktopt->ip6po_hbh) { 2157 optdata = (void *)pktopt->ip6po_hbh; 2158 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2159 optdatalen = (ip6e->ip6e_len + 1) << 3; 2160 } 2161 break; 2162 case IPV6_RTHDR: 2163 if (pktopt && pktopt->ip6po_rthdr) { 2164 optdata = (void *)pktopt->ip6po_rthdr; 2165 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2166 optdatalen = (ip6e->ip6e_len + 1) << 3; 2167 } 2168 break; 2169 case IPV6_RTHDRDSTOPTS: 2170 if (pktopt && pktopt->ip6po_dest1) { 2171 optdata = (void *)pktopt->ip6po_dest1; 2172 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2173 optdatalen = (ip6e->ip6e_len + 1) << 3; 2174 } 2175 break; 2176 case IPV6_DSTOPTS: 2177 if (pktopt && pktopt->ip6po_dest2) { 2178 optdata = (void *)pktopt->ip6po_dest2; 2179 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2180 optdatalen = (ip6e->ip6e_len + 1) << 3; 2181 } 2182 break; 2183 case IPV6_NEXTHOP: 2184 if (pktopt && pktopt->ip6po_nexthop) { 2185 optdata = (void *)pktopt->ip6po_nexthop; 2186 optdatalen = pktopt->ip6po_nexthop->sa_len; 2187 } 2188 break; 2189 case IPV6_USE_MIN_MTU: 2190 if (pktopt) 2191 optdata = (void *)&pktopt->ip6po_minmtu; 2192 else 2193 optdata = (void *)&defminmtu; 2194 optdatalen = sizeof(int); 2195 break; 2196 case IPV6_DONTFRAG: 2197 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2198 on = 1; 2199 else 2200 on = 0; 2201 optdata = (void *)&on; 2202 optdatalen = sizeof(on); 2203 break; 2204 case IPV6_PREFER_TEMPADDR: 2205 if (pktopt) 2206 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2207 else 2208 optdata = (void *)&defpreftemp; 2209 optdatalen = sizeof(int); 2210 break; 2211 default: /* should not happen */ 2212 #ifdef DIAGNOSTIC 2213 panic("ip6_getpcbopt: unexpected option\n"); 2214 #endif 2215 return (ENOPROTOOPT); 2216 } 2217 2218 error = sockopt_set(sopt, optdata, optdatalen); 2219 2220 return (error); 2221 } 2222 2223 void 2224 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2225 { 2226 if (optname == -1 || optname == IPV6_PKTINFO) { 2227 if (pktopt->ip6po_pktinfo) 2228 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2229 pktopt->ip6po_pktinfo = NULL; 2230 } 2231 if (optname == -1 || optname == IPV6_HOPLIMIT) 2232 pktopt->ip6po_hlim = -1; 2233 if (optname == -1 || optname == IPV6_TCLASS) 2234 pktopt->ip6po_tclass = -1; 2235 if (optname == -1 || optname == IPV6_NEXTHOP) { 2236 rtcache_free(&pktopt->ip6po_nextroute); 2237 if (pktopt->ip6po_nexthop) 2238 free(pktopt->ip6po_nexthop, M_IP6OPT); 2239 pktopt->ip6po_nexthop = NULL; 2240 } 2241 if (optname == -1 || optname == IPV6_HOPOPTS) { 2242 if (pktopt->ip6po_hbh) 2243 free(pktopt->ip6po_hbh, M_IP6OPT); 2244 pktopt->ip6po_hbh = NULL; 2245 } 2246 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2247 if (pktopt->ip6po_dest1) 2248 free(pktopt->ip6po_dest1, M_IP6OPT); 2249 pktopt->ip6po_dest1 = NULL; 2250 } 2251 if (optname == -1 || optname == IPV6_RTHDR) { 2252 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2253 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2254 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2255 rtcache_free(&pktopt->ip6po_route); 2256 } 2257 if (optname == -1 || optname == IPV6_DSTOPTS) { 2258 if (pktopt->ip6po_dest2) 2259 free(pktopt->ip6po_dest2, M_IP6OPT); 2260 pktopt->ip6po_dest2 = NULL; 2261 } 2262 } 2263 2264 #define PKTOPT_EXTHDRCPY(type) \ 2265 do { \ 2266 if (src->type) { \ 2267 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2268 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2269 if (dst->type == NULL) \ 2270 goto bad; \ 2271 memcpy(dst->type, src->type, hlen); \ 2272 } \ 2273 } while (/*CONSTCOND*/ 0) 2274 2275 static int 2276 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2277 { 2278 dst->ip6po_hlim = src->ip6po_hlim; 2279 dst->ip6po_tclass = src->ip6po_tclass; 2280 dst->ip6po_flags = src->ip6po_flags; 2281 dst->ip6po_minmtu = src->ip6po_minmtu; 2282 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2283 if (src->ip6po_pktinfo) { 2284 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2285 M_IP6OPT, canwait); 2286 if (dst->ip6po_pktinfo == NULL) 2287 goto bad; 2288 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2289 } 2290 if (src->ip6po_nexthop) { 2291 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2292 M_IP6OPT, canwait); 2293 if (dst->ip6po_nexthop == NULL) 2294 goto bad; 2295 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2296 src->ip6po_nexthop->sa_len); 2297 } 2298 PKTOPT_EXTHDRCPY(ip6po_hbh); 2299 PKTOPT_EXTHDRCPY(ip6po_dest1); 2300 PKTOPT_EXTHDRCPY(ip6po_dest2); 2301 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2302 return (0); 2303 2304 bad: 2305 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2306 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2307 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2308 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2309 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2310 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2311 2312 return (ENOBUFS); 2313 } 2314 #undef PKTOPT_EXTHDRCPY 2315 2316 struct ip6_pktopts * 2317 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2318 { 2319 int error; 2320 struct ip6_pktopts *dst; 2321 2322 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2323 if (dst == NULL) 2324 return (NULL); 2325 ip6_initpktopts(dst); 2326 2327 if ((error = copypktopts(dst, src, canwait)) != 0) { 2328 free(dst, M_IP6OPT); 2329 return (NULL); 2330 } 2331 2332 return (dst); 2333 } 2334 2335 void 2336 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2337 { 2338 if (pktopt == NULL) 2339 return; 2340 2341 ip6_clearpktopts(pktopt, -1); 2342 2343 free(pktopt, M_IP6OPT); 2344 } 2345 2346 int 2347 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, 2348 struct psref *psref, void *v, size_t l) 2349 { 2350 struct ipv6_mreq mreq; 2351 int error; 2352 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2353 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2354 2355 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2356 if (error != 0) 2357 return error; 2358 2359 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2360 /* 2361 * We use the unspecified address to specify to accept 2362 * all multicast addresses. Only super user is allowed 2363 * to do this. 2364 */ 2365 if (kauth_authorize_network(kauth_cred_get(), 2366 KAUTH_NETWORK_IPV6, 2367 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2368 return EACCES; 2369 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2370 // Don't bother if we are not going to use ifp. 2371 if (l == sizeof(*ia)) { 2372 memcpy(v, ia, l); 2373 return 0; 2374 } 2375 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2376 return EINVAL; 2377 } 2378 2379 /* 2380 * If no interface was explicitly specified, choose an 2381 * appropriate one according to the given multicast address. 2382 */ 2383 if (mreq.ipv6mr_interface == 0) { 2384 struct rtentry *rt; 2385 union { 2386 struct sockaddr dst; 2387 struct sockaddr_in dst4; 2388 struct sockaddr_in6 dst6; 2389 } u; 2390 struct route ro; 2391 2392 /* 2393 * Look up the routing table for the 2394 * address, and choose the outgoing interface. 2395 * XXX: is it a good approach? 2396 */ 2397 memset(&ro, 0, sizeof(ro)); 2398 if (IN6_IS_ADDR_V4MAPPED(ia)) 2399 sockaddr_in_init(&u.dst4, ia4, 0); 2400 else 2401 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2402 error = rtcache_setdst(&ro, &u.dst); 2403 if (error != 0) 2404 return error; 2405 rt = rtcache_init(&ro); 2406 *ifp = rt != NULL ? 2407 if_get_byindex(rt->rt_ifp->if_index, psref) : NULL; 2408 rtcache_unref(rt, &ro); 2409 rtcache_free(&ro); 2410 } else { 2411 /* 2412 * If the interface is specified, validate it. 2413 */ 2414 *ifp = if_get_byindex(mreq.ipv6mr_interface, psref); 2415 if (*ifp == NULL) 2416 return ENXIO; /* XXX EINVAL? */ 2417 } 2418 if (sizeof(*ia) == l) 2419 memcpy(v, ia, l); 2420 else 2421 memcpy(v, ia4, l); 2422 return 0; 2423 } 2424 2425 /* 2426 * Set the IP6 multicast options in response to user setsockopt(). 2427 */ 2428 static int 2429 ip6_setmoptions(const struct sockopt *sopt, struct inpcb *inp) 2430 { 2431 int error = 0; 2432 u_int loop, ifindex; 2433 struct ipv6_mreq mreq; 2434 struct in6_addr ia; 2435 struct ifnet *ifp; 2436 struct ip6_moptions *im6o = in6p_moptions(inp); 2437 struct in6_multi_mship *imm; 2438 2439 KASSERT(inp_locked(inp)); 2440 2441 if (im6o == NULL) { 2442 /* 2443 * No multicast option buffer attached to the pcb; 2444 * allocate one and initialize to default values. 2445 */ 2446 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2447 if (im6o == NULL) 2448 return (ENOBUFS); 2449 in6p_moptions(inp) = im6o; 2450 im6o->im6o_multicast_if_index = 0; 2451 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2452 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2453 LIST_INIT(&im6o->im6o_memberships); 2454 } 2455 2456 switch (sopt->sopt_name) { 2457 2458 case IPV6_MULTICAST_IF: { 2459 int s; 2460 /* 2461 * Select the interface for outgoing multicast packets. 2462 */ 2463 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2464 if (error != 0) 2465 break; 2466 2467 s = pserialize_read_enter(); 2468 if (ifindex != 0) { 2469 if ((ifp = if_byindex(ifindex)) == NULL) { 2470 pserialize_read_exit(s); 2471 error = ENXIO; /* XXX EINVAL? */ 2472 break; 2473 } 2474 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2475 pserialize_read_exit(s); 2476 error = EADDRNOTAVAIL; 2477 break; 2478 } 2479 } else 2480 ifp = NULL; 2481 im6o->im6o_multicast_if_index = if_get_index(ifp); 2482 pserialize_read_exit(s); 2483 break; 2484 } 2485 2486 case IPV6_MULTICAST_HOPS: 2487 { 2488 /* 2489 * Set the IP6 hoplimit for outgoing multicast packets. 2490 */ 2491 int optval; 2492 2493 error = sockopt_getint(sopt, &optval); 2494 if (error != 0) 2495 break; 2496 2497 if (optval < -1 || optval >= 256) 2498 error = EINVAL; 2499 else if (optval == -1) 2500 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2501 else 2502 im6o->im6o_multicast_hlim = optval; 2503 break; 2504 } 2505 2506 case IPV6_MULTICAST_LOOP: 2507 /* 2508 * Set the loopback flag for outgoing multicast packets. 2509 * Must be zero or one. 2510 */ 2511 error = sockopt_get(sopt, &loop, sizeof(loop)); 2512 if (error != 0) 2513 break; 2514 if (loop > 1) { 2515 error = EINVAL; 2516 break; 2517 } 2518 im6o->im6o_multicast_loop = loop; 2519 break; 2520 2521 case IPV6_JOIN_GROUP: { 2522 int bound; 2523 struct psref psref; 2524 /* 2525 * Add a multicast group membership. 2526 * Group must be a valid IP6 multicast address. 2527 */ 2528 bound = curlwp_bind(); 2529 ifp = NULL; 2530 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 2531 if (error != 0) { 2532 KASSERT(ifp == NULL); 2533 curlwp_bindx(bound); 2534 return error; 2535 } 2536 2537 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2538 error = ip_setmoptions(&inp->inp_moptions, sopt); 2539 goto put_break; 2540 } 2541 /* 2542 * See if we found an interface, and confirm that it 2543 * supports multicast 2544 */ 2545 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2546 error = EADDRNOTAVAIL; 2547 goto put_break; 2548 } 2549 2550 if (in6_setscope(&ia, ifp, NULL)) { 2551 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2552 goto put_break; 2553 } 2554 2555 /* 2556 * See if the membership already exists. 2557 */ 2558 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2559 if (imm->i6mm_maddr->in6m_ifp == ifp && 2560 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2561 &ia)) 2562 goto put_break; 2563 } 2564 if (imm != NULL) { 2565 error = EADDRINUSE; 2566 goto put_break; 2567 } 2568 /* 2569 * Everything looks good; add a new record to the multicast 2570 * address list for the given interface. 2571 */ 2572 imm = in6_joingroup(ifp, &ia, &error, 0); 2573 if (imm == NULL) 2574 goto put_break; 2575 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2576 put_break: 2577 if_put(ifp, &psref); 2578 curlwp_bindx(bound); 2579 break; 2580 } 2581 2582 case IPV6_LEAVE_GROUP: { 2583 /* 2584 * Drop a multicast group membership. 2585 * Group must be a valid IP6 multicast address. 2586 */ 2587 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2588 if (error != 0) 2589 break; 2590 2591 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2592 error = ip_setmoptions(&inp->inp_moptions, sopt); 2593 break; 2594 } 2595 /* 2596 * If an interface address was specified, get a pointer 2597 * to its ifnet structure. 2598 */ 2599 if (mreq.ipv6mr_interface != 0) { 2600 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2601 error = ENXIO; /* XXX EINVAL? */ 2602 break; 2603 } 2604 } else 2605 ifp = NULL; 2606 2607 /* Fill in the scope zone ID */ 2608 if (ifp) { 2609 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2610 /* XXX: should not happen */ 2611 error = EADDRNOTAVAIL; 2612 break; 2613 } 2614 } else if (mreq.ipv6mr_interface != 0) { 2615 /* 2616 * XXX: This case would happens when the (positive) 2617 * index is in the valid range, but the corresponding 2618 * interface has been detached dynamically. The above 2619 * check probably avoids such case to happen here, but 2620 * we check it explicitly for safety. 2621 */ 2622 error = EADDRNOTAVAIL; 2623 break; 2624 } else { /* ipv6mr_interface == 0 */ 2625 struct sockaddr_in6 sa6_mc; 2626 2627 /* 2628 * The API spec says as follows: 2629 * If the interface index is specified as 0, the 2630 * system may choose a multicast group membership to 2631 * drop by matching the multicast address only. 2632 * On the other hand, we cannot disambiguate the scope 2633 * zone unless an interface is provided. Thus, we 2634 * check if there's ambiguity with the default scope 2635 * zone as the last resort. 2636 */ 2637 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2638 0, 0, 0); 2639 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2640 if (error != 0) 2641 break; 2642 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2643 } 2644 2645 /* 2646 * Find the membership in the membership list. 2647 */ 2648 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2649 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2650 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2651 &mreq.ipv6mr_multiaddr)) 2652 break; 2653 } 2654 if (imm == NULL) { 2655 /* Unable to resolve interface */ 2656 error = EADDRNOTAVAIL; 2657 break; 2658 } 2659 /* 2660 * Give up the multicast address record to which the 2661 * membership points. 2662 */ 2663 LIST_REMOVE(imm, i6mm_chain); 2664 in6_leavegroup(imm); 2665 /* in6m_ifp should not leave thanks to inp_lock */ 2666 break; 2667 } 2668 2669 default: 2670 error = EOPNOTSUPP; 2671 break; 2672 } 2673 2674 /* 2675 * If all options have default values, no need to keep the mbuf. 2676 */ 2677 if (im6o->im6o_multicast_if_index == 0 && 2678 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2679 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2680 LIST_EMPTY(&im6o->im6o_memberships)) { 2681 free(in6p_moptions(inp), M_IPMOPTS); 2682 in6p_moptions(inp) = NULL; 2683 } 2684 2685 return (error); 2686 } 2687 2688 /* 2689 * Return the IP6 multicast options in response to user getsockopt(). 2690 */ 2691 static int 2692 ip6_getmoptions(struct sockopt *sopt, struct inpcb *inp) 2693 { 2694 u_int optval; 2695 int error; 2696 struct ip6_moptions *im6o = in6p_moptions(inp); 2697 2698 switch (sopt->sopt_name) { 2699 case IPV6_MULTICAST_IF: 2700 if (im6o == NULL || im6o->im6o_multicast_if_index == 0) 2701 optval = 0; 2702 else 2703 optval = im6o->im6o_multicast_if_index; 2704 2705 error = sockopt_set(sopt, &optval, sizeof(optval)); 2706 break; 2707 2708 case IPV6_MULTICAST_HOPS: 2709 if (im6o == NULL) 2710 optval = ip6_defmcasthlim; 2711 else 2712 optval = im6o->im6o_multicast_hlim; 2713 2714 error = sockopt_set(sopt, &optval, sizeof(optval)); 2715 break; 2716 2717 case IPV6_MULTICAST_LOOP: 2718 if (im6o == NULL) 2719 optval = IPV6_DEFAULT_MULTICAST_LOOP; 2720 else 2721 optval = im6o->im6o_multicast_loop; 2722 2723 error = sockopt_set(sopt, &optval, sizeof(optval)); 2724 break; 2725 2726 default: 2727 error = EOPNOTSUPP; 2728 } 2729 2730 return (error); 2731 } 2732 2733 /* 2734 * Discard the IP6 multicast options. 2735 */ 2736 void 2737 ip6_freemoptions(struct ip6_moptions *im6o) 2738 { 2739 struct in6_multi_mship *imm, *nimm; 2740 2741 if (im6o == NULL) 2742 return; 2743 2744 /* The owner of im6o (inp) should be protected by solock */ 2745 LIST_FOREACH_SAFE(imm, &im6o->im6o_memberships, i6mm_chain, nimm) { 2746 LIST_REMOVE(imm, i6mm_chain); 2747 in6_leavegroup(imm); 2748 } 2749 free(im6o, M_IPMOPTS); 2750 } 2751 2752 /* 2753 * Set IPv6 outgoing packet options based on advanced API. 2754 */ 2755 int 2756 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2757 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2758 { 2759 struct cmsghdr *cm = 0; 2760 2761 if (control == NULL || opt == NULL) 2762 return (EINVAL); 2763 2764 ip6_initpktopts(opt); 2765 if (stickyopt) { 2766 int error; 2767 2768 /* 2769 * If stickyopt is provided, make a local copy of the options 2770 * for this particular packet, then override them by ancillary 2771 * objects. 2772 * XXX: copypktopts() does not copy the cached route to a next 2773 * hop (if any). This is not very good in terms of efficiency, 2774 * but we can allow this since this option should be rarely 2775 * used. 2776 */ 2777 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2778 return (error); 2779 } 2780 2781 /* 2782 * XXX: Currently, we assume all the optional information is stored 2783 * in a single mbuf. 2784 */ 2785 if (control->m_next) 2786 return (EINVAL); 2787 2788 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2789 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2790 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2791 int error; 2792 2793 if (control->m_len < CMSG_LEN(0)) 2794 return (EINVAL); 2795 2796 cm = mtod(control, struct cmsghdr *); 2797 if (cm->cmsg_len < CMSG_LEN(0) || cm->cmsg_len > control->m_len) 2798 return (EINVAL); 2799 if (cm->cmsg_level != IPPROTO_IPV6) 2800 continue; 2801 2802 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2803 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2804 if (error) 2805 return (error); 2806 } 2807 2808 return (0); 2809 } 2810 2811 /* 2812 * Set a particular packet option, as a sticky option or an ancillary data 2813 * item. "len" can be 0 only when it's a sticky option. 2814 * We have 4 cases of combination of "sticky" and "cmsg": 2815 * "sticky=0, cmsg=0": impossible 2816 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2817 * "sticky=1, cmsg=0": RFC3542 socket option 2818 * "sticky=1, cmsg=1": RFC2292 socket option 2819 */ 2820 static int 2821 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2822 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2823 { 2824 int minmtupolicy; 2825 int error; 2826 2827 if (!sticky && !cmsg) { 2828 #ifdef DIAGNOSTIC 2829 printf("ip6_setpktopt: impossible case\n"); 2830 #endif 2831 return (EINVAL); 2832 } 2833 2834 /* 2835 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2836 * not be specified in the context of RFC3542. Conversely, 2837 * RFC3542 types should not be specified in the context of RFC2292. 2838 */ 2839 if (!cmsg) { 2840 switch (optname) { 2841 case IPV6_2292PKTINFO: 2842 case IPV6_2292HOPLIMIT: 2843 case IPV6_2292NEXTHOP: 2844 case IPV6_2292HOPOPTS: 2845 case IPV6_2292DSTOPTS: 2846 case IPV6_2292RTHDR: 2847 case IPV6_2292PKTOPTIONS: 2848 return (ENOPROTOOPT); 2849 } 2850 } 2851 if (sticky && cmsg) { 2852 switch (optname) { 2853 case IPV6_PKTINFO: 2854 case IPV6_HOPLIMIT: 2855 case IPV6_NEXTHOP: 2856 case IPV6_HOPOPTS: 2857 case IPV6_DSTOPTS: 2858 case IPV6_RTHDRDSTOPTS: 2859 case IPV6_RTHDR: 2860 case IPV6_USE_MIN_MTU: 2861 case IPV6_DONTFRAG: 2862 case IPV6_OTCLASS: 2863 case IPV6_TCLASS: 2864 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2865 return (ENOPROTOOPT); 2866 } 2867 } 2868 2869 switch (optname) { 2870 #ifdef RFC2292 2871 case IPV6_2292PKTINFO: 2872 #endif 2873 case IPV6_PKTINFO: 2874 { 2875 struct in6_pktinfo *pktinfo; 2876 2877 if (len != sizeof(struct in6_pktinfo)) 2878 return (EINVAL); 2879 2880 pktinfo = (struct in6_pktinfo *)buf; 2881 2882 /* 2883 * An application can clear any sticky IPV6_PKTINFO option by 2884 * doing a "regular" setsockopt with ipi6_addr being 2885 * in6addr_any and ipi6_ifindex being zero. 2886 * [RFC 3542, Section 6] 2887 */ 2888 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2889 pktinfo->ipi6_ifindex == 0 && 2890 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2891 ip6_clearpktopts(opt, optname); 2892 break; 2893 } 2894 2895 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2896 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2897 return (EINVAL); 2898 } 2899 2900 /* Validate the interface index if specified. */ 2901 if (pktinfo->ipi6_ifindex) { 2902 struct ifnet *ifp; 2903 int s = pserialize_read_enter(); 2904 ifp = if_byindex(pktinfo->ipi6_ifindex); 2905 if (ifp == NULL) { 2906 pserialize_read_exit(s); 2907 return ENXIO; 2908 } 2909 pserialize_read_exit(s); 2910 } 2911 2912 /* 2913 * We store the address anyway, and let in6_selectsrc() 2914 * validate the specified address. This is because ipi6_addr 2915 * may not have enough information about its scope zone, and 2916 * we may need additional information (such as outgoing 2917 * interface or the scope zone of a destination address) to 2918 * disambiguate the scope. 2919 * XXX: the delay of the validation may confuse the 2920 * application when it is used as a sticky option. 2921 */ 2922 if (opt->ip6po_pktinfo == NULL) { 2923 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2924 M_IP6OPT, M_NOWAIT); 2925 if (opt->ip6po_pktinfo == NULL) 2926 return (ENOBUFS); 2927 } 2928 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2929 break; 2930 } 2931 2932 #ifdef RFC2292 2933 case IPV6_2292HOPLIMIT: 2934 #endif 2935 case IPV6_HOPLIMIT: 2936 { 2937 int *hlimp; 2938 2939 /* 2940 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2941 * to simplify the ordering among hoplimit options. 2942 */ 2943 if (optname == IPV6_HOPLIMIT && sticky) 2944 return (ENOPROTOOPT); 2945 2946 if (len != sizeof(int)) 2947 return (EINVAL); 2948 hlimp = (int *)buf; 2949 if (*hlimp < -1 || *hlimp > 255) 2950 return (EINVAL); 2951 2952 opt->ip6po_hlim = *hlimp; 2953 break; 2954 } 2955 2956 case IPV6_OTCLASS: 2957 if (len != sizeof(u_int8_t)) 2958 return (EINVAL); 2959 2960 opt->ip6po_tclass = *(u_int8_t *)buf; 2961 break; 2962 2963 case IPV6_TCLASS: 2964 { 2965 int tclass; 2966 2967 if (len != sizeof(int)) 2968 return (EINVAL); 2969 tclass = *(int *)buf; 2970 if (tclass < -1 || tclass > 255) 2971 return (EINVAL); 2972 2973 opt->ip6po_tclass = tclass; 2974 break; 2975 } 2976 2977 #ifdef RFC2292 2978 case IPV6_2292NEXTHOP: 2979 #endif 2980 case IPV6_NEXTHOP: 2981 error = kauth_authorize_network(cred, 2982 KAUTH_NETWORK_IPV6, 2983 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2984 if (error) 2985 return (error); 2986 2987 if (len == 0) { /* just remove the option */ 2988 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2989 break; 2990 } 2991 2992 /* check if cmsg_len is large enough for sa_len */ 2993 if (len < sizeof(struct sockaddr) || len < *buf) 2994 return (EINVAL); 2995 2996 switch (((struct sockaddr *)buf)->sa_family) { 2997 case AF_INET6: 2998 { 2999 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3000 3001 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3002 return (EINVAL); 3003 3004 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3005 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3006 return (EINVAL); 3007 } 3008 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3009 != 0) { 3010 return (error); 3011 } 3012 break; 3013 } 3014 case AF_LINK: /* eventually be supported? */ 3015 default: 3016 return (EAFNOSUPPORT); 3017 } 3018 3019 /* turn off the previous option, then set the new option. */ 3020 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3021 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3022 if (opt->ip6po_nexthop == NULL) 3023 return (ENOBUFS); 3024 memcpy(opt->ip6po_nexthop, buf, *buf); 3025 break; 3026 3027 #ifdef RFC2292 3028 case IPV6_2292HOPOPTS: 3029 #endif 3030 case IPV6_HOPOPTS: 3031 { 3032 struct ip6_hbh *hbh; 3033 int hbhlen; 3034 3035 /* 3036 * XXX: We don't allow a non-privileged user to set ANY HbH 3037 * options, since per-option restriction has too much 3038 * overhead. 3039 */ 3040 error = kauth_authorize_network(cred, 3041 KAUTH_NETWORK_IPV6, 3042 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3043 if (error) 3044 return (error); 3045 3046 if (len == 0) { 3047 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3048 break; /* just remove the option */ 3049 } 3050 3051 /* message length validation */ 3052 if (len < sizeof(struct ip6_hbh)) 3053 return (EINVAL); 3054 hbh = (struct ip6_hbh *)buf; 3055 hbhlen = (hbh->ip6h_len + 1) << 3; 3056 if (len != hbhlen) 3057 return (EINVAL); 3058 3059 /* turn off the previous option, then set the new option. */ 3060 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3061 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3062 if (opt->ip6po_hbh == NULL) 3063 return (ENOBUFS); 3064 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3065 3066 break; 3067 } 3068 3069 #ifdef RFC2292 3070 case IPV6_2292DSTOPTS: 3071 #endif 3072 case IPV6_DSTOPTS: 3073 case IPV6_RTHDRDSTOPTS: 3074 { 3075 struct ip6_dest *dest, **newdest = NULL; 3076 int destlen; 3077 3078 /* XXX: see the comment for IPV6_HOPOPTS */ 3079 error = kauth_authorize_network(cred, 3080 KAUTH_NETWORK_IPV6, 3081 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3082 if (error) 3083 return (error); 3084 3085 if (len == 0) { 3086 ip6_clearpktopts(opt, optname); 3087 break; /* just remove the option */ 3088 } 3089 3090 /* message length validation */ 3091 if (len < sizeof(struct ip6_dest)) 3092 return (EINVAL); 3093 dest = (struct ip6_dest *)buf; 3094 destlen = (dest->ip6d_len + 1) << 3; 3095 if (len != destlen) 3096 return (EINVAL); 3097 /* 3098 * Determine the position that the destination options header 3099 * should be inserted; before or after the routing header. 3100 */ 3101 switch (optname) { 3102 case IPV6_2292DSTOPTS: 3103 /* 3104 * The old advanced API is ambiguous on this point. 3105 * Our approach is to determine the position based 3106 * according to the existence of a routing header. 3107 * Note, however, that this depends on the order of the 3108 * extension headers in the ancillary data; the 1st 3109 * part of the destination options header must appear 3110 * before the routing header in the ancillary data, 3111 * too. 3112 * RFC3542 solved the ambiguity by introducing 3113 * separate ancillary data or option types. 3114 */ 3115 if (opt->ip6po_rthdr == NULL) 3116 newdest = &opt->ip6po_dest1; 3117 else 3118 newdest = &opt->ip6po_dest2; 3119 break; 3120 case IPV6_RTHDRDSTOPTS: 3121 newdest = &opt->ip6po_dest1; 3122 break; 3123 case IPV6_DSTOPTS: 3124 newdest = &opt->ip6po_dest2; 3125 break; 3126 } 3127 3128 /* turn off the previous option, then set the new option. */ 3129 ip6_clearpktopts(opt, optname); 3130 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3131 if (*newdest == NULL) 3132 return (ENOBUFS); 3133 memcpy(*newdest, dest, destlen); 3134 3135 break; 3136 } 3137 3138 #ifdef RFC2292 3139 case IPV6_2292RTHDR: 3140 #endif 3141 case IPV6_RTHDR: 3142 { 3143 struct ip6_rthdr *rth; 3144 int rthlen; 3145 3146 if (len == 0) { 3147 ip6_clearpktopts(opt, IPV6_RTHDR); 3148 break; /* just remove the option */ 3149 } 3150 3151 /* message length validation */ 3152 if (len < sizeof(struct ip6_rthdr)) 3153 return (EINVAL); 3154 rth = (struct ip6_rthdr *)buf; 3155 rthlen = (rth->ip6r_len + 1) << 3; 3156 if (len != rthlen) 3157 return (EINVAL); 3158 switch (rth->ip6r_type) { 3159 case IPV6_RTHDR_TYPE_0: 3160 /* Dropped, RFC5095. */ 3161 default: 3162 return (EINVAL); /* not supported */ 3163 } 3164 /* turn off the previous option */ 3165 ip6_clearpktopts(opt, IPV6_RTHDR); 3166 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3167 if (opt->ip6po_rthdr == NULL) 3168 return (ENOBUFS); 3169 memcpy(opt->ip6po_rthdr, rth, rthlen); 3170 break; 3171 } 3172 3173 case IPV6_USE_MIN_MTU: 3174 if (len != sizeof(int)) 3175 return (EINVAL); 3176 minmtupolicy = *(int *)buf; 3177 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3178 minmtupolicy != IP6PO_MINMTU_DISABLE && 3179 minmtupolicy != IP6PO_MINMTU_ALL) { 3180 return (EINVAL); 3181 } 3182 opt->ip6po_minmtu = minmtupolicy; 3183 break; 3184 3185 case IPV6_DONTFRAG: 3186 if (len != sizeof(int)) 3187 return (EINVAL); 3188 3189 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3190 /* 3191 * we ignore this option for TCP sockets. 3192 * (RFC3542 leaves this case unspecified.) 3193 */ 3194 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3195 } else 3196 opt->ip6po_flags |= IP6PO_DONTFRAG; 3197 break; 3198 3199 case IPV6_PREFER_TEMPADDR: 3200 { 3201 int preftemp; 3202 3203 if (len != sizeof(int)) 3204 return (EINVAL); 3205 preftemp = *(int *)buf; 3206 switch (preftemp) { 3207 case IP6PO_TEMPADDR_SYSTEM: 3208 case IP6PO_TEMPADDR_NOTPREFER: 3209 case IP6PO_TEMPADDR_PREFER: 3210 break; 3211 default: 3212 return (EINVAL); 3213 } 3214 opt->ip6po_prefer_tempaddr = preftemp; 3215 break; 3216 } 3217 3218 default: 3219 return (ENOPROTOOPT); 3220 } /* end of switch */ 3221 3222 return (0); 3223 } 3224 3225 /* 3226 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3227 * packet to the input queue of a specified interface. Note that this 3228 * calls the output routine of the loopback "driver", but with an interface 3229 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3230 */ 3231 void 3232 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3233 const struct sockaddr_in6 *dst) 3234 { 3235 struct mbuf *copym; 3236 struct ip6_hdr *ip6; 3237 3238 copym = m_copypacket(m, M_DONTWAIT); 3239 if (copym == NULL) 3240 return; 3241 3242 /* 3243 * Make sure to deep-copy IPv6 header portion in case the data 3244 * is in an mbuf cluster, so that we can safely override the IPv6 3245 * header portion later. 3246 */ 3247 if ((copym->m_flags & M_EXT) != 0 || 3248 copym->m_len < sizeof(struct ip6_hdr)) { 3249 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3250 if (copym == NULL) 3251 return; 3252 } 3253 3254 #ifdef DIAGNOSTIC 3255 if (copym->m_len < sizeof(*ip6)) { 3256 m_freem(copym); 3257 return; 3258 } 3259 #endif 3260 3261 ip6 = mtod(copym, struct ip6_hdr *); 3262 /* 3263 * clear embedded scope identifiers if necessary. 3264 * in6_clearscope will touch the addresses only when necessary. 3265 */ 3266 in6_clearscope(&ip6->ip6_src); 3267 in6_clearscope(&ip6->ip6_dst); 3268 3269 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3270 } 3271 3272 /* 3273 * Chop IPv6 header off from the payload. 3274 */ 3275 static int 3276 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3277 { 3278 struct mbuf *mh; 3279 struct ip6_hdr *ip6; 3280 3281 ip6 = mtod(m, struct ip6_hdr *); 3282 if (m->m_len > sizeof(*ip6)) { 3283 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3284 if (mh == NULL) { 3285 m_freem(m); 3286 return ENOBUFS; 3287 } 3288 m_move_pkthdr(mh, m); 3289 m_align(mh, sizeof(*ip6)); 3290 m->m_len -= sizeof(*ip6); 3291 m->m_data += sizeof(*ip6); 3292 mh->m_next = m; 3293 mh->m_len = sizeof(*ip6); 3294 memcpy(mtod(mh, void *), (void *)ip6, sizeof(*ip6)); 3295 m = mh; 3296 } 3297 exthdrs->ip6e_ip6 = m; 3298 return 0; 3299 } 3300 3301 /* 3302 * Compute IPv6 extension header length. 3303 */ 3304 int 3305 ip6_optlen(struct inpcb *inp) 3306 { 3307 int len; 3308 3309 if (!in6p_outputopts(inp)) 3310 return 0; 3311 3312 len = 0; 3313 #define elen(x) \ 3314 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3315 3316 len += elen(in6p_outputopts(inp)->ip6po_hbh); 3317 len += elen(in6p_outputopts(inp)->ip6po_dest1); 3318 len += elen(in6p_outputopts(inp)->ip6po_rthdr); 3319 len += elen(in6p_outputopts(inp)->ip6po_dest2); 3320 return len; 3321 #undef elen 3322 } 3323 3324 /* 3325 * Ensure sending address is valid. 3326 * Returns 0 on success, -1 if an error should be sent back or 1 3327 * if the packet could be dropped without error (protocol dependent). 3328 */ 3329 static int 3330 ip6_ifaddrvalid(const struct in6_addr *src, const struct in6_addr *dst) 3331 { 3332 struct sockaddr_in6 sin6; 3333 int s, error; 3334 struct ifaddr *ifa; 3335 struct in6_ifaddr *ia6; 3336 3337 if (IN6_IS_ADDR_UNSPECIFIED(src)) 3338 return 0; 3339 3340 memset(&sin6, 0, sizeof(sin6)); 3341 sin6.sin6_family = AF_INET6; 3342 sin6.sin6_len = sizeof(sin6); 3343 sin6.sin6_addr = *src; 3344 3345 s = pserialize_read_enter(); 3346 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 3347 if ((ia6 = ifatoia6(ifa)) == NULL || 3348 ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) 3349 error = -1; 3350 else if (ia6->ia6_flags & IN6_IFF_TENTATIVE) 3351 error = 1; 3352 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 3353 (sin6.sin6_addr = *dst, ifa_ifwithaddr(sin6tosa(&sin6)) == NULL)) 3354 /* Allow internal traffic to DETACHED addresses */ 3355 error = 1; 3356 else 3357 error = 0; 3358 pserialize_read_exit(s); 3359 3360 return error; 3361 } 3362
Indexes created Wed Oct 01 07:09:59 GMT 2025