ip6_output.c revision 1.211
1 /* $NetBSD: ip6_output.c,v 1.211 2018/06/01 08:56:00 maxv 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 1.211 2018/06/01 08:56:00 maxv 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 m_freem(m); 169 return error; 170 } 171 } 172 173 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 174 error = if_output_lock(ifp, origifp, m, sin6tocsa(dst), rt); 175 else 176 error = if_output_lock(ifp, ifp, m, sin6tocsa(dst), rt); 177 return error; 178 } 179 180 /* 181 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 182 * header (with pri, len, nxt, hlim, src, dst). 183 * 184 * This function may modify ver and hlim only. The mbuf chain containing the 185 * packet will be freed. The mbuf opt, if present, will not be freed. 186 * 187 * Type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 188 * nd_ifinfo.linkmtu is u_int32_t. So we use u_long to hold largest one, 189 * which is rt_rmx.rmx_mtu. 190 */ 191 int 192 ip6_output( 193 struct mbuf *m0, 194 struct ip6_pktopts *opt, 195 struct route *ro, 196 int flags, 197 struct ip6_moptions *im6o, 198 struct in6pcb *in6p, 199 struct ifnet **ifpp /* XXX: just for statistics */ 200 ) 201 { 202 struct ip6_hdr *ip6, *mhip6; 203 struct ifnet *ifp = NULL, *origifp = NULL; 204 struct mbuf *m = m0; 205 int tlen, len, off; 206 bool tso; 207 struct route ip6route; 208 struct rtentry *rt = NULL, *rt_pmtu; 209 const struct sockaddr_in6 *dst; 210 struct sockaddr_in6 src_sa, dst_sa; 211 int error = 0; 212 struct in6_ifaddr *ia = NULL; 213 u_long mtu; 214 int alwaysfrag, dontfrag; 215 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 216 struct ip6_exthdrs exthdrs; 217 struct in6_addr finaldst, src0, dst0; 218 u_int32_t zone; 219 struct route *ro_pmtu = NULL; 220 int hdrsplit = 0; 221 int needipsec = 0; 222 #ifdef IPSEC 223 struct secpolicy *sp = NULL; 224 #endif 225 struct psref psref, psref_ia; 226 int bound = curlwp_bind(); 227 bool release_psref_ia = false; 228 229 #ifdef DIAGNOSTIC 230 if ((m->m_flags & M_PKTHDR) == 0) 231 panic("ip6_output: no HDR"); 232 if ((m->m_pkthdr.csum_flags & 233 (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { 234 panic("ip6_output: IPv4 checksum offload flags: %d", 235 m->m_pkthdr.csum_flags); 236 } 237 if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 238 (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 239 panic("ip6_output: conflicting checksum offload flags: %d", 240 m->m_pkthdr.csum_flags); 241 } 242 #endif 243 244 M_CSUM_DATA_IPv6_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 245 246 #define MAKE_EXTHDR(hp, mp) \ 247 do { \ 248 if (hp) { \ 249 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 250 error = ip6_copyexthdr((mp), (void *)(hp), \ 251 ((eh)->ip6e_len + 1) << 3); \ 252 if (error) \ 253 goto freehdrs; \ 254 } \ 255 } while (/*CONSTCOND*/ 0) 256 257 memset(&exthdrs, 0, sizeof(exthdrs)); 258 if (opt) { 259 /* Hop-by-Hop options header */ 260 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 261 /* Destination options header (1st part) */ 262 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 263 /* Routing header */ 264 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 265 /* Destination options header (2nd part) */ 266 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 267 } 268 269 /* 270 * Calculate the total length of the extension header chain. 271 * Keep the length of the unfragmentable part for fragmentation. 272 */ 273 optlen = 0; 274 if (exthdrs.ip6e_hbh) 275 optlen += exthdrs.ip6e_hbh->m_len; 276 if (exthdrs.ip6e_dest1) 277 optlen += exthdrs.ip6e_dest1->m_len; 278 if (exthdrs.ip6e_rthdr) 279 optlen += exthdrs.ip6e_rthdr->m_len; 280 unfragpartlen = optlen + sizeof(struct ip6_hdr); 281 /* NOTE: we don't add AH/ESP length here. do that later. */ 282 if (exthdrs.ip6e_dest2) 283 optlen += exthdrs.ip6e_dest2->m_len; 284 285 #ifdef IPSEC 286 if (ipsec_used) { 287 /* Check the security policy (SP) for the packet */ 288 sp = ipsec6_check_policy(m, in6p, flags, &needipsec, &error); 289 if (error != 0) { 290 /* 291 * Hack: -EINVAL is used to signal that a packet 292 * should be silently discarded. This is typically 293 * because we asked key management for an SA and 294 * it was delayed (e.g. kicked up to IKE). 295 */ 296 if (error == -EINVAL) 297 error = 0; 298 goto freehdrs; 299 } 300 } 301 #endif 302 303 if (needipsec && 304 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 305 in6_delayed_cksum(m); 306 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 307 } 308 309 /* 310 * If we need IPsec, or there is at least one extension header, 311 * separate IP6 header from the payload. 312 */ 313 if ((needipsec || optlen) && !hdrsplit) { 314 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 315 m = NULL; 316 goto freehdrs; 317 } 318 m = exthdrs.ip6e_ip6; 319 hdrsplit++; 320 } 321 322 /* adjust pointer */ 323 ip6 = mtod(m, struct ip6_hdr *); 324 325 /* adjust mbuf packet header length */ 326 m->m_pkthdr.len += optlen; 327 plen = m->m_pkthdr.len - sizeof(*ip6); 328 329 /* If this is a jumbo payload, insert a jumbo payload option. */ 330 if (plen > IPV6_MAXPACKET) { 331 if (!hdrsplit) { 332 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 333 m = NULL; 334 goto freehdrs; 335 } 336 m = exthdrs.ip6e_ip6; 337 hdrsplit++; 338 } 339 /* adjust pointer */ 340 ip6 = mtod(m, struct ip6_hdr *); 341 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 342 goto freehdrs; 343 optlen += 8; /* XXX JUMBOOPTLEN */ 344 ip6->ip6_plen = 0; 345 } else 346 ip6->ip6_plen = htons(plen); 347 348 /* 349 * Concatenate headers and fill in next header fields. 350 * Here we have, on "m" 351 * IPv6 payload 352 * and we insert headers accordingly. Finally, we should be getting: 353 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 354 * 355 * during the header composing process, "m" points to IPv6 header. 356 * "mprev" points to an extension header prior to esp. 357 */ 358 { 359 u_char *nexthdrp = &ip6->ip6_nxt; 360 struct mbuf *mprev = m; 361 362 /* 363 * we treat dest2 specially. this makes IPsec processing 364 * much easier. the goal here is to make mprev point the 365 * mbuf prior to dest2. 366 * 367 * result: IPv6 dest2 payload 368 * m and mprev will point to IPv6 header. 369 */ 370 if (exthdrs.ip6e_dest2) { 371 if (!hdrsplit) 372 panic("assumption failed: hdr not split"); 373 exthdrs.ip6e_dest2->m_next = m->m_next; 374 m->m_next = exthdrs.ip6e_dest2; 375 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 376 ip6->ip6_nxt = IPPROTO_DSTOPTS; 377 } 378 379 #define MAKE_CHAIN(m, mp, p, i)\ 380 do {\ 381 if (m) {\ 382 if (!hdrsplit) \ 383 panic("assumption failed: hdr not split"); \ 384 *mtod((m), u_char *) = *(p);\ 385 *(p) = (i);\ 386 p = mtod((m), u_char *);\ 387 (m)->m_next = (mp)->m_next;\ 388 (mp)->m_next = (m);\ 389 (mp) = (m);\ 390 }\ 391 } while (/*CONSTCOND*/ 0) 392 /* 393 * result: IPv6 hbh dest1 rthdr dest2 payload 394 * m will point to IPv6 header. mprev will point to the 395 * extension header prior to dest2 (rthdr in the above case). 396 */ 397 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 399 IPPROTO_DSTOPTS); 400 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 401 IPPROTO_ROUTING); 402 403 M_CSUM_DATA_IPv6_SET(m->m_pkthdr.csum_data, 404 sizeof(struct ip6_hdr) + optlen); 405 } 406 407 /* Need to save for pmtu */ 408 finaldst = ip6->ip6_dst; 409 410 /* 411 * If there is a routing header, replace destination address field 412 * with the first hop of the routing header. 413 */ 414 if (exthdrs.ip6e_rthdr) { 415 struct ip6_rthdr *rh; 416 417 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 418 419 error = ip6_handle_rthdr(rh, ip6); 420 if (error != 0) 421 goto bad; 422 } 423 424 /* Source address validation */ 425 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 426 (flags & IPV6_UNSPECSRC) == 0) { 427 error = EOPNOTSUPP; 428 IP6_STATINC(IP6_STAT_BADSCOPE); 429 goto bad; 430 } 431 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 432 error = EOPNOTSUPP; 433 IP6_STATINC(IP6_STAT_BADSCOPE); 434 goto bad; 435 } 436 437 IP6_STATINC(IP6_STAT_LOCALOUT); 438 439 /* 440 * Route packet. 441 */ 442 /* initialize cached route */ 443 if (ro == NULL) { 444 memset(&ip6route, 0, sizeof(ip6route)); 445 ro = &ip6route; 446 } 447 ro_pmtu = ro; 448 if (opt && opt->ip6po_rthdr) 449 ro = &opt->ip6po_route; 450 451 /* 452 * if specified, try to fill in the traffic class field. 453 * do not override if a non-zero value is already set. 454 * we check the diffserv field and the ecn field separately. 455 */ 456 if (opt && opt->ip6po_tclass >= 0) { 457 int mask = 0; 458 459 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 460 mask |= 0xfc; 461 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 462 mask |= 0x03; 463 if (mask != 0) 464 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 465 } 466 467 /* fill in or override the hop limit field, if necessary. */ 468 if (opt && opt->ip6po_hlim != -1) 469 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 470 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 471 if (im6o != NULL) 472 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 473 else 474 ip6->ip6_hlim = ip6_defmcasthlim; 475 } 476 477 #ifdef IPSEC 478 if (needipsec) { 479 int s = splsoftnet(); 480 error = ipsec6_process_packet(m, sp->req); 481 splx(s); 482 483 /* 484 * Preserve KAME behaviour: ENOENT can be returned 485 * when an SA acquire is in progress. Don't propagate 486 * this to user-level; it confuses applications. 487 * XXX this will go away when the SADB is redone. 488 */ 489 if (error == ENOENT) 490 error = 0; 491 492 goto done; 493 } 494 #endif 495 496 /* adjust pointer */ 497 ip6 = mtod(m, struct ip6_hdr *); 498 499 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 500 501 /* We do not need a route for multicast */ 502 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 503 struct in6_pktinfo *pi = NULL; 504 505 /* 506 * If the outgoing interface for the address is specified by 507 * the caller, use it. 508 */ 509 if (opt && (pi = opt->ip6po_pktinfo) != NULL) { 510 /* XXX boundary check is assumed to be already done. */ 511 ifp = if_get_byindex(pi->ipi6_ifindex, &psref); 512 } else if (im6o != NULL) { 513 ifp = if_get_byindex(im6o->im6o_multicast_if_index, 514 &psref); 515 } 516 } 517 518 if (ifp == NULL) { 519 error = in6_selectroute(&dst_sa, opt, &ro, &rt, true); 520 if (error != 0) 521 goto bad; 522 ifp = if_get_byindex(rt->rt_ifp->if_index, &psref); 523 } 524 525 if (rt == NULL) { 526 /* 527 * If in6_selectroute() does not return a route entry, 528 * dst may not have been updated. 529 */ 530 error = rtcache_setdst(ro, sin6tosa(&dst_sa)); 531 if (error) { 532 goto bad; 533 } 534 } 535 536 /* 537 * then rt (for unicast) and ifp must be non-NULL valid values. 538 */ 539 if ((flags & IPV6_FORWARDING) == 0) { 540 /* XXX: the FORWARDING flag can be set for mrouting. */ 541 in6_ifstat_inc(ifp, ifs6_out_request); 542 } 543 if (rt != NULL) { 544 ia = (struct in6_ifaddr *)(rt->rt_ifa); 545 rt->rt_use++; 546 } 547 548 /* 549 * The outgoing interface must be in the zone of source and 550 * destination addresses. We should use ia_ifp to support the 551 * case of sending packets to an address of our own. 552 */ 553 if (ia != NULL && ia->ia_ifp) { 554 origifp = ia->ia_ifp; 555 if (if_is_deactivated(origifp)) 556 goto bad; 557 if_acquire(origifp, &psref_ia); 558 release_psref_ia = true; 559 } else 560 origifp = ifp; 561 562 src0 = ip6->ip6_src; 563 if (in6_setscope(&src0, origifp, &zone)) 564 goto badscope; 565 sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); 566 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 567 goto badscope; 568 569 dst0 = ip6->ip6_dst; 570 if (in6_setscope(&dst0, origifp, &zone)) 571 goto badscope; 572 /* re-initialize to be sure */ 573 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 574 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 575 goto badscope; 576 577 /* scope check is done. */ 578 579 /* Ensure we only send from a valid address. */ 580 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 581 (error = ip6_ifaddrvalid(&src0, &dst0)) != 0) 582 { 583 char ip6buf[INET6_ADDRSTRLEN]; 584 nd6log(LOG_ERR, 585 "refusing to send from invalid address %s (pid %d)\n", 586 IN6_PRINT(ip6buf, &src0), curproc->p_pid); 587 IP6_STATINC(IP6_STAT_ODROPPED); 588 in6_ifstat_inc(origifp, ifs6_out_discard); 589 if (error == 1) 590 /* 591 * Address exists, but is tentative or detached. 592 * We can't send from it because it's invalid, 593 * so we drop the packet. 594 */ 595 error = 0; 596 else 597 error = EADDRNOTAVAIL; 598 goto bad; 599 } 600 601 if (rt != NULL && (rt->rt_flags & RTF_GATEWAY) && 602 !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 603 dst = satocsin6(rt->rt_gateway); 604 else 605 dst = satocsin6(rtcache_getdst(ro)); 606 607 /* 608 * XXXXXX: original code follows: 609 */ 610 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 611 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 612 else { 613 bool ingroup; 614 615 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 616 617 in6_ifstat_inc(ifp, ifs6_out_mcast); 618 619 /* 620 * Confirm that the outgoing interface supports multicast. 621 */ 622 if (!(ifp->if_flags & IFF_MULTICAST)) { 623 IP6_STATINC(IP6_STAT_NOROUTE); 624 in6_ifstat_inc(ifp, ifs6_out_discard); 625 error = ENETUNREACH; 626 goto bad; 627 } 628 629 ingroup = in6_multi_group(&ip6->ip6_dst, ifp); 630 if (ingroup && (im6o == NULL || im6o->im6o_multicast_loop)) { 631 /* 632 * If we belong to the destination multicast group 633 * on the outgoing interface, and the caller did not 634 * forbid loopback, loop back a copy. 635 */ 636 KASSERT(dst != NULL); 637 ip6_mloopback(ifp, m, dst); 638 } else { 639 /* 640 * If we are acting as a multicast router, perform 641 * multicast forwarding as if the packet had just 642 * arrived on the interface to which we are about 643 * to send. The multicast forwarding function 644 * recursively calls this function, using the 645 * IPV6_FORWARDING flag to prevent infinite recursion. 646 * 647 * Multicasts that are looped back by ip6_mloopback(), 648 * above, will be forwarded by the ip6_input() routine, 649 * if necessary. 650 */ 651 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 652 if (ip6_mforward(ip6, ifp, m) != 0) { 653 m_freem(m); 654 goto done; 655 } 656 } 657 } 658 /* 659 * Multicasts with a hoplimit of zero may be looped back, 660 * above, but must not be transmitted on a network. 661 * Also, multicasts addressed to the loopback interface 662 * are not sent -- the above call to ip6_mloopback() will 663 * loop back a copy if this host actually belongs to the 664 * destination group on the loopback interface. 665 */ 666 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 667 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 668 m_freem(m); 669 goto done; 670 } 671 } 672 673 /* 674 * Fill the outgoing inteface to tell the upper layer 675 * to increment per-interface statistics. 676 */ 677 if (ifpp) 678 *ifpp = ifp; 679 680 /* Determine path MTU. */ 681 /* 682 * ro_pmtu represent final destination while 683 * ro might represent immediate destination. 684 * Use ro_pmtu destination since MTU might differ. 685 */ 686 if (ro_pmtu != ro) { 687 union { 688 struct sockaddr dst; 689 struct sockaddr_in6 dst6; 690 } u; 691 692 /* ro_pmtu may not have a cache */ 693 sockaddr_in6_init(&u.dst6, &finaldst, 0, 0, 0); 694 rt_pmtu = rtcache_lookup(ro_pmtu, &u.dst); 695 } else 696 rt_pmtu = rt; 697 error = ip6_getpmtu(rt_pmtu, ifp, &mtu, &alwaysfrag); 698 if (rt_pmtu != NULL && rt_pmtu != rt) 699 rtcache_unref(rt_pmtu, ro_pmtu); 700 if (error != 0) 701 goto bad; 702 703 /* 704 * The caller of this function may specify to use the minimum MTU 705 * in some cases. 706 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 707 * setting. The logic is a bit complicated; by default, unicast 708 * packets will follow path MTU while multicast packets will be sent at 709 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 710 * including unicast ones will be sent at the minimum MTU. Multicast 711 * packets will always be sent at the minimum MTU unless 712 * IP6PO_MINMTU_DISABLE is explicitly specified. 713 * See RFC 3542 for more details. 714 */ 715 if (mtu > IPV6_MMTU) { 716 if ((flags & IPV6_MINMTU)) 717 mtu = IPV6_MMTU; 718 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 719 mtu = IPV6_MMTU; 720 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 721 (opt == NULL || 722 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 723 mtu = IPV6_MMTU; 724 } 725 } 726 727 /* 728 * clear embedded scope identifiers if necessary. 729 * in6_clearscope will touch the addresses only when necessary. 730 */ 731 in6_clearscope(&ip6->ip6_src); 732 in6_clearscope(&ip6->ip6_dst); 733 734 /* 735 * If the outgoing packet contains a hop-by-hop options header, 736 * it must be examined and processed even by the source node. 737 * (RFC 2460, section 4.) 738 * 739 * XXX Is this really necessary? 740 */ 741 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 742 u_int32_t dummy1; /* XXX unused */ 743 u_int32_t dummy2; /* XXX unused */ 744 int hoff = sizeof(struct ip6_hdr); 745 746 if (ip6_hopopts_input(&dummy1, &dummy2, &m, &hoff)) { 747 /* m was already freed at this point */ 748 error = EINVAL; 749 goto done; 750 } 751 752 ip6 = mtod(m, struct ip6_hdr *); 753 } 754 755 /* 756 * Run through list of hooks for output packets. 757 */ 758 if ((error = pfil_run_hooks(inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 759 goto done; 760 if (m == NULL) 761 goto done; 762 ip6 = mtod(m, struct ip6_hdr *); 763 764 /* 765 * Send the packet to the outgoing interface. 766 * If necessary, do IPv6 fragmentation before sending. 767 * 768 * the logic here is rather complex: 769 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 770 * 1-a: send as is if tlen <= path mtu 771 * 1-b: fragment if tlen > path mtu 772 * 773 * 2: if user asks us not to fragment (dontfrag == 1) 774 * 2-a: send as is if tlen <= interface mtu 775 * 2-b: error if tlen > interface mtu 776 * 777 * 3: if we always need to attach fragment header (alwaysfrag == 1) 778 * always fragment 779 * 780 * 4: if dontfrag == 1 && alwaysfrag == 1 781 * error, as we cannot handle this conflicting request 782 */ 783 tlen = m->m_pkthdr.len; 784 tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; 785 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 786 dontfrag = 1; 787 else 788 dontfrag = 0; 789 790 if (dontfrag && alwaysfrag) { /* case 4 */ 791 /* conflicting request - can't transmit */ 792 error = EMSGSIZE; 793 goto bad; 794 } 795 if (dontfrag && (!tso && tlen > IN6_LINKMTU(ifp))) { /* case 2-b */ 796 /* 797 * Even if the DONTFRAG option is specified, we cannot send the 798 * packet when the data length is larger than the MTU of the 799 * outgoing interface. 800 * Notify the error by sending IPV6_PATHMTU ancillary data as 801 * well as returning an error code (the latter is not described 802 * in the API spec.) 803 */ 804 u_int32_t mtu32; 805 struct ip6ctlparam ip6cp; 806 807 mtu32 = (u_int32_t)mtu; 808 memset(&ip6cp, 0, sizeof(ip6cp)); 809 ip6cp.ip6c_cmdarg = (void *)&mtu32; 810 pfctlinput2(PRC_MSGSIZE, 811 rtcache_getdst(ro_pmtu), &ip6cp); 812 813 error = EMSGSIZE; 814 goto bad; 815 } 816 817 /* 818 * transmit packet without fragmentation 819 */ 820 if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { 821 /* case 1-a and 2-a */ 822 struct in6_ifaddr *ia6; 823 int sw_csum; 824 int s; 825 826 ip6 = mtod(m, struct ip6_hdr *); 827 s = pserialize_read_enter(); 828 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 829 if (ia6) { 830 /* Record statistics for this interface address. */ 831 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 832 } 833 pserialize_read_exit(s); 834 835 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 836 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 837 if (IN6_NEED_CHECKSUM(ifp, 838 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 839 in6_delayed_cksum(m); 840 } 841 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 842 } 843 844 KASSERT(dst != NULL); 845 if (__predict_true(!tso || 846 (ifp->if_capenable & IFCAP_TSOv6) != 0)) { 847 error = ip6_if_output(ifp, origifp, m, dst, rt); 848 } else { 849 error = ip6_tso_output(ifp, origifp, m, dst, rt); 850 } 851 goto done; 852 } 853 854 if (tso) { 855 error = EINVAL; /* XXX */ 856 goto bad; 857 } 858 859 /* 860 * try to fragment the packet. case 1-b and 3 861 */ 862 if (mtu < IPV6_MMTU) { 863 /* path MTU cannot be less than IPV6_MMTU */ 864 error = EMSGSIZE; 865 in6_ifstat_inc(ifp, ifs6_out_fragfail); 866 goto bad; 867 } else if (ip6->ip6_plen == 0) { 868 /* jumbo payload cannot be fragmented */ 869 error = EMSGSIZE; 870 in6_ifstat_inc(ifp, ifs6_out_fragfail); 871 goto bad; 872 } else { 873 const u_int32_t id = htonl(ip6_randomid()); 874 struct mbuf **mnext, *m_frgpart; 875 const int hlen = unfragpartlen; 876 struct ip6_frag *ip6f; 877 u_char nextproto; 878 879 if (mtu > IPV6_MAXPACKET) 880 mtu = IPV6_MAXPACKET; 881 882 /* 883 * Must be able to put at least 8 bytes per fragment. 884 */ 885 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 886 if (len < 8) { 887 error = EMSGSIZE; 888 in6_ifstat_inc(ifp, ifs6_out_fragfail); 889 goto bad; 890 } 891 892 mnext = &m->m_nextpkt; 893 894 /* 895 * Change the next header field of the last header in the 896 * unfragmentable part. 897 */ 898 if (exthdrs.ip6e_rthdr) { 899 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 900 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 901 } else if (exthdrs.ip6e_dest1) { 902 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 903 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 904 } else if (exthdrs.ip6e_hbh) { 905 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 906 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 907 } else { 908 nextproto = ip6->ip6_nxt; 909 ip6->ip6_nxt = IPPROTO_FRAGMENT; 910 } 911 912 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 913 != 0) { 914 if (IN6_NEED_CHECKSUM(ifp, 915 m->m_pkthdr.csum_flags & 916 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 917 in6_delayed_cksum(m); 918 } 919 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 920 } 921 922 /* 923 * Loop through length of segment after first fragment, 924 * make new header and copy data of each part and link onto 925 * chain. 926 */ 927 m0 = m; 928 for (off = hlen; off < tlen; off += len) { 929 struct mbuf *mlast; 930 931 MGETHDR(m, M_DONTWAIT, MT_HEADER); 932 if (!m) { 933 error = ENOBUFS; 934 IP6_STATINC(IP6_STAT_ODROPPED); 935 goto sendorfree; 936 } 937 m_reset_rcvif(m); 938 m->m_flags = m0->m_flags & M_COPYFLAGS; 939 *mnext = m; 940 mnext = &m->m_nextpkt; 941 m->m_data += max_linkhdr; 942 mhip6 = mtod(m, struct ip6_hdr *); 943 *mhip6 = *ip6; 944 m->m_len = sizeof(*mhip6); 945 946 ip6f = NULL; 947 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 948 if (error) { 949 IP6_STATINC(IP6_STAT_ODROPPED); 950 goto sendorfree; 951 } 952 953 /* Fill in the Frag6 Header */ 954 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 955 if (off + len >= tlen) 956 len = tlen - off; 957 else 958 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 959 ip6f->ip6f_reserved = 0; 960 ip6f->ip6f_ident = id; 961 ip6f->ip6f_nxt = nextproto; 962 963 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 964 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 965 if ((m_frgpart = m_copym(m0, off, len, M_DONTWAIT)) == NULL) { 966 error = ENOBUFS; 967 IP6_STATINC(IP6_STAT_ODROPPED); 968 goto sendorfree; 969 } 970 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 971 ; 972 mlast->m_next = m_frgpart; 973 974 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 975 m_reset_rcvif(m); 976 IP6_STATINC(IP6_STAT_OFRAGMENTS); 977 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 978 } 979 980 in6_ifstat_inc(ifp, ifs6_out_fragok); 981 } 982 983 sendorfree: 984 m = m0->m_nextpkt; 985 m0->m_nextpkt = 0; 986 m_freem(m0); 987 for (m0 = m; m; m = m0) { 988 m0 = m->m_nextpkt; 989 m->m_nextpkt = 0; 990 if (error == 0) { 991 struct in6_ifaddr *ia6; 992 int s; 993 ip6 = mtod(m, struct ip6_hdr *); 994 s = pserialize_read_enter(); 995 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 996 if (ia6) { 997 /* 998 * Record statistics for this interface 999 * address. 1000 */ 1001 ia6->ia_ifa.ifa_data.ifad_outbytes += 1002 m->m_pkthdr.len; 1003 } 1004 pserialize_read_exit(s); 1005 KASSERT(dst != NULL); 1006 error = ip6_if_output(ifp, origifp, m, dst, rt); 1007 } else 1008 m_freem(m); 1009 } 1010 1011 if (error == 0) 1012 IP6_STATINC(IP6_STAT_FRAGMENTED); 1013 1014 done: 1015 rtcache_unref(rt, ro); 1016 if (ro == &ip6route) 1017 rtcache_free(&ip6route); 1018 #ifdef IPSEC 1019 if (sp != NULL) 1020 KEY_SP_UNREF(&sp); 1021 #endif 1022 if_put(ifp, &psref); 1023 if (release_psref_ia) 1024 if_put(origifp, &psref_ia); 1025 curlwp_bindx(bound); 1026 1027 return error; 1028 1029 freehdrs: 1030 m_freem(exthdrs.ip6e_hbh); 1031 m_freem(exthdrs.ip6e_dest1); 1032 m_freem(exthdrs.ip6e_rthdr); 1033 m_freem(exthdrs.ip6e_dest2); 1034 /* FALLTHROUGH */ 1035 bad: 1036 m_freem(m); 1037 goto done; 1038 1039 badscope: 1040 IP6_STATINC(IP6_STAT_BADSCOPE); 1041 in6_ifstat_inc(origifp, ifs6_out_discard); 1042 if (error == 0) 1043 error = EHOSTUNREACH; /* XXX */ 1044 goto bad; 1045 } 1046 1047 static int 1048 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1049 { 1050 struct mbuf *m; 1051 1052 if (hlen > MCLBYTES) 1053 return ENOBUFS; /* XXX */ 1054 1055 MGET(m, M_DONTWAIT, MT_DATA); 1056 if (!m) 1057 return ENOBUFS; 1058 1059 if (hlen > MLEN) { 1060 MCLGET(m, M_DONTWAIT); 1061 if ((m->m_flags & M_EXT) == 0) { 1062 m_free(m); 1063 return ENOBUFS; 1064 } 1065 } 1066 m->m_len = hlen; 1067 if (hdr) 1068 memcpy(mtod(m, void *), hdr, hlen); 1069 1070 *mp = m; 1071 return 0; 1072 } 1073 1074 /* 1075 * Process a delayed payload checksum calculation. 1076 */ 1077 void 1078 in6_delayed_cksum(struct mbuf *m) 1079 { 1080 uint16_t csum, offset; 1081 1082 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1083 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1084 KASSERT((m->m_pkthdr.csum_flags 1085 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1086 1087 offset = M_CSUM_DATA_IPv6_IPHL(m->m_pkthdr.csum_data); 1088 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1089 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1090 csum = 0xffff; 1091 } 1092 1093 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1094 if ((offset + sizeof(csum)) > m->m_len) { 1095 m_copyback(m, offset, sizeof(csum), &csum); 1096 } else { 1097 *(uint16_t *)(mtod(m, char *) + offset) = csum; 1098 } 1099 } 1100 1101 /* 1102 * Insert jumbo payload option. 1103 */ 1104 static int 1105 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1106 { 1107 struct mbuf *mopt; 1108 u_int8_t *optbuf; 1109 u_int32_t v; 1110 1111 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1112 1113 /* 1114 * If there is no hop-by-hop options header, allocate new one. 1115 * If there is one but it doesn't have enough space to store the 1116 * jumbo payload option, allocate a cluster to store the whole options. 1117 * Otherwise, use it to store the options. 1118 */ 1119 if (exthdrs->ip6e_hbh == NULL) { 1120 MGET(mopt, M_DONTWAIT, MT_DATA); 1121 if (mopt == 0) 1122 return (ENOBUFS); 1123 mopt->m_len = JUMBOOPTLEN; 1124 optbuf = mtod(mopt, u_int8_t *); 1125 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1126 exthdrs->ip6e_hbh = mopt; 1127 } else { 1128 struct ip6_hbh *hbh; 1129 1130 mopt = exthdrs->ip6e_hbh; 1131 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1132 const int oldoptlen = mopt->m_len; 1133 struct mbuf *n; 1134 1135 /* 1136 * Assumptions: 1137 * - exthdrs->ip6e_hbh is not referenced from places 1138 * other than exthdrs. 1139 * - exthdrs->ip6e_hbh is not an mbuf chain. 1140 */ 1141 KASSERT(mopt->m_next == NULL); 1142 1143 /* 1144 * Give up if the whole (new) hbh header does not fit 1145 * even in an mbuf cluster. 1146 */ 1147 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1148 return ENOBUFS; 1149 1150 /* 1151 * At this point, we must always prepare a cluster. 1152 */ 1153 MGET(n, M_DONTWAIT, MT_DATA); 1154 if (n) { 1155 MCLGET(n, M_DONTWAIT); 1156 if ((n->m_flags & M_EXT) == 0) { 1157 m_freem(n); 1158 n = NULL; 1159 } 1160 } 1161 if (!n) 1162 return ENOBUFS; 1163 1164 n->m_len = oldoptlen + JUMBOOPTLEN; 1165 bcopy(mtod(mopt, void *), mtod(n, void *), 1166 oldoptlen); 1167 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1168 m_freem(mopt); 1169 mopt = exthdrs->ip6e_hbh = n; 1170 } else { 1171 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1172 mopt->m_len += JUMBOOPTLEN; 1173 } 1174 optbuf[0] = IP6OPT_PADN; 1175 optbuf[1] = 0; 1176 1177 /* 1178 * Adjust the header length according to the pad and 1179 * the jumbo payload option. 1180 */ 1181 hbh = mtod(mopt, struct ip6_hbh *); 1182 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1183 } 1184 1185 /* fill in the option. */ 1186 optbuf[2] = IP6OPT_JUMBO; 1187 optbuf[3] = 4; 1188 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1189 memcpy(&optbuf[4], &v, sizeof(u_int32_t)); 1190 1191 /* finally, adjust the packet header length */ 1192 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1193 1194 return 0; 1195 #undef JUMBOOPTLEN 1196 } 1197 1198 /* 1199 * Insert fragment header and copy unfragmentable header portions. 1200 * 1201 * *frghdrp will not be read, and it is guaranteed that either an 1202 * error is returned or that *frghdrp will point to space allocated 1203 * for the fragment header. 1204 * 1205 * On entry, m contains: 1206 * IPv6 Header 1207 * On exit, it contains: 1208 * IPv6 Header -> Unfragmentable Part -> Frag6 Header 1209 */ 1210 static int 1211 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1212 struct ip6_frag **frghdrp) 1213 { 1214 struct mbuf *n, *mlast; 1215 1216 if (hlen > sizeof(struct ip6_hdr)) { 1217 n = m_copym(m0, sizeof(struct ip6_hdr), 1218 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1219 if (n == NULL) 1220 return ENOBUFS; 1221 m->m_next = n; 1222 } else 1223 n = m; 1224 1225 /* Search for the last mbuf of unfragmentable part. */ 1226 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1227 ; 1228 1229 if ((mlast->m_flags & M_EXT) == 0 && 1230 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1231 /* use the trailing space of the last mbuf for the fragment hdr */ 1232 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1233 mlast->m_len); 1234 mlast->m_len += sizeof(struct ip6_frag); 1235 } else { 1236 /* allocate a new mbuf for the fragment header */ 1237 struct mbuf *mfrg; 1238 1239 MGET(mfrg, M_DONTWAIT, MT_DATA); 1240 if (mfrg == NULL) 1241 return ENOBUFS; 1242 mfrg->m_len = sizeof(struct ip6_frag); 1243 *frghdrp = mtod(mfrg, struct ip6_frag *); 1244 mlast->m_next = mfrg; 1245 } 1246 1247 return 0; 1248 } 1249 1250 static int 1251 ip6_getpmtu(struct rtentry *rt, struct ifnet *ifp, u_long *mtup, 1252 int *alwaysfragp) 1253 { 1254 u_int32_t mtu = 0; 1255 int alwaysfrag = 0; 1256 int error = 0; 1257 1258 if (rt != NULL) { 1259 u_int32_t ifmtu; 1260 1261 if (ifp == NULL) 1262 ifp = rt->rt_ifp; 1263 ifmtu = IN6_LINKMTU(ifp); 1264 mtu = rt->rt_rmx.rmx_mtu; 1265 if (mtu == 0) 1266 mtu = ifmtu; 1267 else if (mtu < IPV6_MMTU) { 1268 /* 1269 * RFC2460 section 5, last paragraph: 1270 * if we record ICMPv6 too big message with 1271 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1272 * or smaller, with fragment header attached. 1273 * (fragment header is needed regardless from the 1274 * packet size, for translators to identify packets) 1275 */ 1276 alwaysfrag = 1; 1277 mtu = IPV6_MMTU; 1278 } else if (mtu > ifmtu) { 1279 /* 1280 * The MTU on the route is larger than the MTU on 1281 * the interface! This shouldn't happen, unless the 1282 * MTU of the interface has been changed after the 1283 * interface was brought up. Change the MTU in the 1284 * route to match the interface MTU (as long as the 1285 * field isn't locked). 1286 */ 1287 mtu = ifmtu; 1288 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1289 rt->rt_rmx.rmx_mtu = mtu; 1290 } 1291 } else if (ifp) { 1292 mtu = IN6_LINKMTU(ifp); 1293 } else 1294 error = EHOSTUNREACH; /* XXX */ 1295 1296 *mtup = mtu; 1297 if (alwaysfragp) 1298 *alwaysfragp = alwaysfrag; 1299 return (error); 1300 } 1301 1302 /* 1303 * IP6 socket option processing. 1304 */ 1305 int 1306 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1307 { 1308 int optdatalen, uproto; 1309 void *optdata; 1310 struct in6pcb *in6p = sotoin6pcb(so); 1311 struct ip_moptions **mopts; 1312 int error, optval; 1313 int level, optname; 1314 1315 KASSERT(solocked(so)); 1316 KASSERT(sopt != NULL); 1317 1318 level = sopt->sopt_level; 1319 optname = sopt->sopt_name; 1320 1321 error = optval = 0; 1322 uproto = (int)so->so_proto->pr_protocol; 1323 1324 switch (level) { 1325 case IPPROTO_IP: 1326 switch (optname) { 1327 case IP_ADD_MEMBERSHIP: 1328 case IP_DROP_MEMBERSHIP: 1329 case IP_MULTICAST_IF: 1330 case IP_MULTICAST_LOOP: 1331 case IP_MULTICAST_TTL: 1332 mopts = &in6p->in6p_v4moptions; 1333 switch (op) { 1334 case PRCO_GETOPT: 1335 return ip_getmoptions(*mopts, sopt); 1336 case PRCO_SETOPT: 1337 return ip_setmoptions(mopts, sopt); 1338 default: 1339 return EINVAL; 1340 } 1341 default: 1342 return ENOPROTOOPT; 1343 } 1344 case IPPROTO_IPV6: 1345 break; 1346 default: 1347 return ENOPROTOOPT; 1348 } 1349 switch (op) { 1350 case PRCO_SETOPT: 1351 switch (optname) { 1352 #ifdef RFC2292 1353 case IPV6_2292PKTOPTIONS: 1354 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1355 break; 1356 #endif 1357 1358 /* 1359 * Use of some Hop-by-Hop options or some 1360 * Destination options, might require special 1361 * privilege. That is, normal applications 1362 * (without special privilege) might be forbidden 1363 * from setting certain options in outgoing packets, 1364 * and might never see certain options in received 1365 * packets. [RFC 2292 Section 6] 1366 * KAME specific note: 1367 * KAME prevents non-privileged users from sending or 1368 * receiving ANY hbh/dst options in order to avoid 1369 * overhead of parsing options in the kernel. 1370 */ 1371 case IPV6_RECVHOPOPTS: 1372 case IPV6_RECVDSTOPTS: 1373 case IPV6_RECVRTHDRDSTOPTS: 1374 error = kauth_authorize_network(kauth_cred_get(), 1375 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1376 NULL, NULL, NULL); 1377 if (error) 1378 break; 1379 /* FALLTHROUGH */ 1380 case IPV6_UNICAST_HOPS: 1381 case IPV6_HOPLIMIT: 1382 case IPV6_FAITH: 1383 1384 case IPV6_RECVPKTINFO: 1385 case IPV6_RECVHOPLIMIT: 1386 case IPV6_RECVRTHDR: 1387 case IPV6_RECVPATHMTU: 1388 case IPV6_RECVTCLASS: 1389 case IPV6_V6ONLY: 1390 error = sockopt_getint(sopt, &optval); 1391 if (error) 1392 break; 1393 switch (optname) { 1394 case IPV6_UNICAST_HOPS: 1395 if (optval < -1 || optval >= 256) 1396 error = EINVAL; 1397 else { 1398 /* -1 = kernel default */ 1399 in6p->in6p_hops = optval; 1400 } 1401 break; 1402 #define OPTSET(bit) \ 1403 do { \ 1404 if (optval) \ 1405 in6p->in6p_flags |= (bit); \ 1406 else \ 1407 in6p->in6p_flags &= ~(bit); \ 1408 } while (/*CONSTCOND*/ 0) 1409 1410 #ifdef RFC2292 1411 #define OPTSET2292(bit) \ 1412 do { \ 1413 in6p->in6p_flags |= IN6P_RFC2292; \ 1414 if (optval) \ 1415 in6p->in6p_flags |= (bit); \ 1416 else \ 1417 in6p->in6p_flags &= ~(bit); \ 1418 } while (/*CONSTCOND*/ 0) 1419 #endif 1420 1421 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1422 1423 case IPV6_RECVPKTINFO: 1424 #ifdef RFC2292 1425 /* cannot mix with RFC2292 */ 1426 if (OPTBIT(IN6P_RFC2292)) { 1427 error = EINVAL; 1428 break; 1429 } 1430 #endif 1431 OPTSET(IN6P_PKTINFO); 1432 break; 1433 1434 case IPV6_HOPLIMIT: 1435 { 1436 struct ip6_pktopts **optp; 1437 1438 #ifdef RFC2292 1439 /* cannot mix with RFC2292 */ 1440 if (OPTBIT(IN6P_RFC2292)) { 1441 error = EINVAL; 1442 break; 1443 } 1444 #endif 1445 optp = &in6p->in6p_outputopts; 1446 error = ip6_pcbopt(IPV6_HOPLIMIT, 1447 (u_char *)&optval, 1448 sizeof(optval), 1449 optp, 1450 kauth_cred_get(), uproto); 1451 break; 1452 } 1453 1454 case IPV6_RECVHOPLIMIT: 1455 #ifdef RFC2292 1456 /* cannot mix with RFC2292 */ 1457 if (OPTBIT(IN6P_RFC2292)) { 1458 error = EINVAL; 1459 break; 1460 } 1461 #endif 1462 OPTSET(IN6P_HOPLIMIT); 1463 break; 1464 1465 case IPV6_RECVHOPOPTS: 1466 #ifdef RFC2292 1467 /* cannot mix with RFC2292 */ 1468 if (OPTBIT(IN6P_RFC2292)) { 1469 error = EINVAL; 1470 break; 1471 } 1472 #endif 1473 OPTSET(IN6P_HOPOPTS); 1474 break; 1475 1476 case IPV6_RECVDSTOPTS: 1477 #ifdef RFC2292 1478 /* cannot mix with RFC2292 */ 1479 if (OPTBIT(IN6P_RFC2292)) { 1480 error = EINVAL; 1481 break; 1482 } 1483 #endif 1484 OPTSET(IN6P_DSTOPTS); 1485 break; 1486 1487 case IPV6_RECVRTHDRDSTOPTS: 1488 #ifdef RFC2292 1489 /* cannot mix with RFC2292 */ 1490 if (OPTBIT(IN6P_RFC2292)) { 1491 error = EINVAL; 1492 break; 1493 } 1494 #endif 1495 OPTSET(IN6P_RTHDRDSTOPTS); 1496 break; 1497 1498 case IPV6_RECVRTHDR: 1499 #ifdef RFC2292 1500 /* cannot mix with RFC2292 */ 1501 if (OPTBIT(IN6P_RFC2292)) { 1502 error = EINVAL; 1503 break; 1504 } 1505 #endif 1506 OPTSET(IN6P_RTHDR); 1507 break; 1508 1509 case IPV6_FAITH: 1510 OPTSET(IN6P_FAITH); 1511 break; 1512 1513 case IPV6_RECVPATHMTU: 1514 /* 1515 * We ignore this option for TCP 1516 * sockets. 1517 * (RFC3542 leaves this case 1518 * unspecified.) 1519 */ 1520 if (uproto != IPPROTO_TCP) 1521 OPTSET(IN6P_MTU); 1522 break; 1523 1524 case IPV6_V6ONLY: 1525 /* 1526 * make setsockopt(IPV6_V6ONLY) 1527 * available only prior to bind(2). 1528 * see ipng mailing list, Jun 22 2001. 1529 */ 1530 if (in6p->in6p_lport || 1531 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1532 error = EINVAL; 1533 break; 1534 } 1535 #ifdef INET6_BINDV6ONLY 1536 if (!optval) 1537 error = EINVAL; 1538 #else 1539 OPTSET(IN6P_IPV6_V6ONLY); 1540 #endif 1541 break; 1542 case IPV6_RECVTCLASS: 1543 #ifdef RFC2292 1544 /* cannot mix with RFC2292 XXX */ 1545 if (OPTBIT(IN6P_RFC2292)) { 1546 error = EINVAL; 1547 break; 1548 } 1549 #endif 1550 OPTSET(IN6P_TCLASS); 1551 break; 1552 1553 } 1554 break; 1555 1556 case IPV6_OTCLASS: 1557 { 1558 struct ip6_pktopts **optp; 1559 u_int8_t tclass; 1560 1561 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1562 if (error) 1563 break; 1564 optp = &in6p->in6p_outputopts; 1565 error = ip6_pcbopt(optname, 1566 (u_char *)&tclass, 1567 sizeof(tclass), 1568 optp, 1569 kauth_cred_get(), uproto); 1570 break; 1571 } 1572 1573 case IPV6_TCLASS: 1574 case IPV6_DONTFRAG: 1575 case IPV6_USE_MIN_MTU: 1576 case IPV6_PREFER_TEMPADDR: 1577 error = sockopt_getint(sopt, &optval); 1578 if (error) 1579 break; 1580 { 1581 struct ip6_pktopts **optp; 1582 optp = &in6p->in6p_outputopts; 1583 error = ip6_pcbopt(optname, 1584 (u_char *)&optval, 1585 sizeof(optval), 1586 optp, 1587 kauth_cred_get(), uproto); 1588 break; 1589 } 1590 1591 #ifdef RFC2292 1592 case IPV6_2292PKTINFO: 1593 case IPV6_2292HOPLIMIT: 1594 case IPV6_2292HOPOPTS: 1595 case IPV6_2292DSTOPTS: 1596 case IPV6_2292RTHDR: 1597 /* RFC 2292 */ 1598 error = sockopt_getint(sopt, &optval); 1599 if (error) 1600 break; 1601 1602 switch (optname) { 1603 case IPV6_2292PKTINFO: 1604 OPTSET2292(IN6P_PKTINFO); 1605 break; 1606 case IPV6_2292HOPLIMIT: 1607 OPTSET2292(IN6P_HOPLIMIT); 1608 break; 1609 case IPV6_2292HOPOPTS: 1610 /* 1611 * Check super-user privilege. 1612 * See comments for IPV6_RECVHOPOPTS. 1613 */ 1614 error = 1615 kauth_authorize_network(kauth_cred_get(), 1616 KAUTH_NETWORK_IPV6, 1617 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1618 NULL, NULL); 1619 if (error) 1620 return (error); 1621 OPTSET2292(IN6P_HOPOPTS); 1622 break; 1623 case IPV6_2292DSTOPTS: 1624 error = 1625 kauth_authorize_network(kauth_cred_get(), 1626 KAUTH_NETWORK_IPV6, 1627 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1628 NULL, NULL); 1629 if (error) 1630 return (error); 1631 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1632 break; 1633 case IPV6_2292RTHDR: 1634 OPTSET2292(IN6P_RTHDR); 1635 break; 1636 } 1637 break; 1638 #endif 1639 case IPV6_PKTINFO: 1640 case IPV6_HOPOPTS: 1641 case IPV6_RTHDR: 1642 case IPV6_DSTOPTS: 1643 case IPV6_RTHDRDSTOPTS: 1644 case IPV6_NEXTHOP: { 1645 /* new advanced API (RFC3542) */ 1646 void *optbuf; 1647 int optbuflen; 1648 struct ip6_pktopts **optp; 1649 1650 #ifdef RFC2292 1651 /* cannot mix with RFC2292 */ 1652 if (OPTBIT(IN6P_RFC2292)) { 1653 error = EINVAL; 1654 break; 1655 } 1656 #endif 1657 1658 optbuflen = sopt->sopt_size; 1659 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1660 if (optbuf == NULL) { 1661 error = ENOBUFS; 1662 break; 1663 } 1664 1665 error = sockopt_get(sopt, optbuf, optbuflen); 1666 if (error) { 1667 free(optbuf, M_IP6OPT); 1668 break; 1669 } 1670 optp = &in6p->in6p_outputopts; 1671 error = ip6_pcbopt(optname, optbuf, optbuflen, 1672 optp, kauth_cred_get(), uproto); 1673 1674 free(optbuf, M_IP6OPT); 1675 break; 1676 } 1677 #undef OPTSET 1678 1679 case IPV6_MULTICAST_IF: 1680 case IPV6_MULTICAST_HOPS: 1681 case IPV6_MULTICAST_LOOP: 1682 case IPV6_JOIN_GROUP: 1683 case IPV6_LEAVE_GROUP: 1684 error = ip6_setmoptions(sopt, in6p); 1685 break; 1686 1687 case IPV6_PORTRANGE: 1688 error = sockopt_getint(sopt, &optval); 1689 if (error) 1690 break; 1691 1692 switch (optval) { 1693 case IPV6_PORTRANGE_DEFAULT: 1694 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1695 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1696 break; 1697 1698 case IPV6_PORTRANGE_HIGH: 1699 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1700 in6p->in6p_flags |= IN6P_HIGHPORT; 1701 break; 1702 1703 case IPV6_PORTRANGE_LOW: 1704 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1705 in6p->in6p_flags |= IN6P_LOWPORT; 1706 break; 1707 1708 default: 1709 error = EINVAL; 1710 break; 1711 } 1712 break; 1713 1714 case IPV6_PORTALGO: 1715 error = sockopt_getint(sopt, &optval); 1716 if (error) 1717 break; 1718 1719 error = portalgo_algo_index_select( 1720 (struct inpcb_hdr *)in6p, optval); 1721 break; 1722 1723 #if defined(IPSEC) 1724 case IPV6_IPSEC_POLICY: 1725 if (ipsec_enabled) { 1726 error = ipsec_set_policy(in6p, 1727 sopt->sopt_data, sopt->sopt_size, 1728 kauth_cred_get()); 1729 break; 1730 } 1731 /*FALLTHROUGH*/ 1732 #endif /* IPSEC */ 1733 1734 default: 1735 error = ENOPROTOOPT; 1736 break; 1737 } 1738 break; 1739 1740 case PRCO_GETOPT: 1741 switch (optname) { 1742 #ifdef RFC2292 1743 case IPV6_2292PKTOPTIONS: 1744 /* 1745 * RFC3542 (effectively) deprecated the 1746 * semantics of the 2292-style pktoptions. 1747 * Since it was not reliable in nature (i.e., 1748 * applications had to expect the lack of some 1749 * information after all), it would make sense 1750 * to simplify this part by always returning 1751 * empty data. 1752 */ 1753 break; 1754 #endif 1755 1756 case IPV6_RECVHOPOPTS: 1757 case IPV6_RECVDSTOPTS: 1758 case IPV6_RECVRTHDRDSTOPTS: 1759 case IPV6_UNICAST_HOPS: 1760 case IPV6_RECVPKTINFO: 1761 case IPV6_RECVHOPLIMIT: 1762 case IPV6_RECVRTHDR: 1763 case IPV6_RECVPATHMTU: 1764 1765 case IPV6_FAITH: 1766 case IPV6_V6ONLY: 1767 case IPV6_PORTRANGE: 1768 case IPV6_RECVTCLASS: 1769 switch (optname) { 1770 1771 case IPV6_RECVHOPOPTS: 1772 optval = OPTBIT(IN6P_HOPOPTS); 1773 break; 1774 1775 case IPV6_RECVDSTOPTS: 1776 optval = OPTBIT(IN6P_DSTOPTS); 1777 break; 1778 1779 case IPV6_RECVRTHDRDSTOPTS: 1780 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1781 break; 1782 1783 case IPV6_UNICAST_HOPS: 1784 optval = in6p->in6p_hops; 1785 break; 1786 1787 case IPV6_RECVPKTINFO: 1788 optval = OPTBIT(IN6P_PKTINFO); 1789 break; 1790 1791 case IPV6_RECVHOPLIMIT: 1792 optval = OPTBIT(IN6P_HOPLIMIT); 1793 break; 1794 1795 case IPV6_RECVRTHDR: 1796 optval = OPTBIT(IN6P_RTHDR); 1797 break; 1798 1799 case IPV6_RECVPATHMTU: 1800 optval = OPTBIT(IN6P_MTU); 1801 break; 1802 1803 case IPV6_FAITH: 1804 optval = OPTBIT(IN6P_FAITH); 1805 break; 1806 1807 case IPV6_V6ONLY: 1808 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1809 break; 1810 1811 case IPV6_PORTRANGE: 1812 { 1813 int flags; 1814 flags = in6p->in6p_flags; 1815 if (flags & IN6P_HIGHPORT) 1816 optval = IPV6_PORTRANGE_HIGH; 1817 else if (flags & IN6P_LOWPORT) 1818 optval = IPV6_PORTRANGE_LOW; 1819 else 1820 optval = 0; 1821 break; 1822 } 1823 case IPV6_RECVTCLASS: 1824 optval = OPTBIT(IN6P_TCLASS); 1825 break; 1826 1827 } 1828 if (error) 1829 break; 1830 error = sockopt_setint(sopt, optval); 1831 break; 1832 1833 case IPV6_PATHMTU: 1834 { 1835 u_long pmtu = 0; 1836 struct ip6_mtuinfo mtuinfo; 1837 struct route *ro = &in6p->in6p_route; 1838 struct rtentry *rt; 1839 union { 1840 struct sockaddr dst; 1841 struct sockaddr_in6 dst6; 1842 } u; 1843 1844 if (!(so->so_state & SS_ISCONNECTED)) 1845 return (ENOTCONN); 1846 /* 1847 * XXX: we dot not consider the case of source 1848 * routing, or optional information to specify 1849 * the outgoing interface. 1850 */ 1851 sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0); 1852 rt = rtcache_lookup(ro, &u.dst); 1853 error = ip6_getpmtu(rt, NULL, &pmtu, NULL); 1854 rtcache_unref(rt, ro); 1855 if (error) 1856 break; 1857 if (pmtu > IPV6_MAXPACKET) 1858 pmtu = IPV6_MAXPACKET; 1859 1860 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1861 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1862 optdata = (void *)&mtuinfo; 1863 optdatalen = sizeof(mtuinfo); 1864 if (optdatalen > MCLBYTES) 1865 return (EMSGSIZE); /* XXX */ 1866 error = sockopt_set(sopt, optdata, optdatalen); 1867 break; 1868 } 1869 1870 #ifdef RFC2292 1871 case IPV6_2292PKTINFO: 1872 case IPV6_2292HOPLIMIT: 1873 case IPV6_2292HOPOPTS: 1874 case IPV6_2292RTHDR: 1875 case IPV6_2292DSTOPTS: 1876 switch (optname) { 1877 case IPV6_2292PKTINFO: 1878 optval = OPTBIT(IN6P_PKTINFO); 1879 break; 1880 case IPV6_2292HOPLIMIT: 1881 optval = OPTBIT(IN6P_HOPLIMIT); 1882 break; 1883 case IPV6_2292HOPOPTS: 1884 optval = OPTBIT(IN6P_HOPOPTS); 1885 break; 1886 case IPV6_2292RTHDR: 1887 optval = OPTBIT(IN6P_RTHDR); 1888 break; 1889 case IPV6_2292DSTOPTS: 1890 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1891 break; 1892 } 1893 error = sockopt_setint(sopt, optval); 1894 break; 1895 #endif 1896 case IPV6_PKTINFO: 1897 case IPV6_HOPOPTS: 1898 case IPV6_RTHDR: 1899 case IPV6_DSTOPTS: 1900 case IPV6_RTHDRDSTOPTS: 1901 case IPV6_NEXTHOP: 1902 case IPV6_OTCLASS: 1903 case IPV6_TCLASS: 1904 case IPV6_DONTFRAG: 1905 case IPV6_USE_MIN_MTU: 1906 case IPV6_PREFER_TEMPADDR: 1907 error = ip6_getpcbopt(in6p->in6p_outputopts, 1908 optname, sopt); 1909 break; 1910 1911 case IPV6_MULTICAST_IF: 1912 case IPV6_MULTICAST_HOPS: 1913 case IPV6_MULTICAST_LOOP: 1914 case IPV6_JOIN_GROUP: 1915 case IPV6_LEAVE_GROUP: 1916 error = ip6_getmoptions(sopt, in6p); 1917 break; 1918 1919 case IPV6_PORTALGO: 1920 optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; 1921 error = sockopt_setint(sopt, optval); 1922 break; 1923 1924 #if defined(IPSEC) 1925 case IPV6_IPSEC_POLICY: 1926 if (ipsec_used) { 1927 struct mbuf *m = NULL; 1928 1929 /* 1930 * XXX: this will return EINVAL as sopt is 1931 * empty 1932 */ 1933 error = ipsec_get_policy(in6p, sopt->sopt_data, 1934 sopt->sopt_size, &m); 1935 if (!error) 1936 error = sockopt_setmbuf(sopt, m); 1937 break; 1938 } 1939 /*FALLTHROUGH*/ 1940 #endif /* IPSEC */ 1941 1942 default: 1943 error = ENOPROTOOPT; 1944 break; 1945 } 1946 break; 1947 } 1948 return (error); 1949 } 1950 1951 int 1952 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1953 { 1954 int error = 0, optval; 1955 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1956 struct in6pcb *in6p = sotoin6pcb(so); 1957 int level, optname; 1958 1959 KASSERT(sopt != NULL); 1960 1961 level = sopt->sopt_level; 1962 optname = sopt->sopt_name; 1963 1964 if (level != IPPROTO_IPV6) { 1965 return ENOPROTOOPT; 1966 } 1967 1968 switch (optname) { 1969 case IPV6_CHECKSUM: 1970 /* 1971 * For ICMPv6 sockets, no modification allowed for checksum 1972 * offset, permit "no change" values to help existing apps. 1973 * 1974 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 1975 * for an ICMPv6 socket will fail." The current 1976 * behavior does not meet RFC3542. 1977 */ 1978 switch (op) { 1979 case PRCO_SETOPT: 1980 error = sockopt_getint(sopt, &optval); 1981 if (error) 1982 break; 1983 if ((optval % 2) != 0) { 1984 /* the API assumes even offset values */ 1985 error = EINVAL; 1986 } else if (so->so_proto->pr_protocol == 1987 IPPROTO_ICMPV6) { 1988 if (optval != icmp6off) 1989 error = EINVAL; 1990 } else 1991 in6p->in6p_cksum = optval; 1992 break; 1993 1994 case PRCO_GETOPT: 1995 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1996 optval = icmp6off; 1997 else 1998 optval = in6p->in6p_cksum; 1999 2000 error = sockopt_setint(sopt, optval); 2001 break; 2002 2003 default: 2004 error = EINVAL; 2005 break; 2006 } 2007 break; 2008 2009 default: 2010 error = ENOPROTOOPT; 2011 break; 2012 } 2013 2014 return (error); 2015 } 2016 2017 #ifdef RFC2292 2018 /* 2019 * Set up IP6 options in pcb for insertion in output packets or 2020 * specifying behavior of outgoing packets. 2021 */ 2022 static int 2023 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 2024 struct sockopt *sopt) 2025 { 2026 struct ip6_pktopts *opt = *pktopt; 2027 struct mbuf *m; 2028 int error = 0; 2029 2030 KASSERT(solocked(so)); 2031 2032 /* turn off any old options. */ 2033 if (opt) { 2034 #ifdef DIAGNOSTIC 2035 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2036 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2037 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2038 printf("ip6_pcbopts: all specified options are cleared.\n"); 2039 #endif 2040 ip6_clearpktopts(opt, -1); 2041 } else { 2042 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2043 if (opt == NULL) 2044 return (ENOBUFS); 2045 } 2046 *pktopt = NULL; 2047 2048 if (sopt == NULL || sopt->sopt_size == 0) { 2049 /* 2050 * Only turning off any previous options, regardless of 2051 * whether the opt is just created or given. 2052 */ 2053 free(opt, M_IP6OPT); 2054 return (0); 2055 } 2056 2057 /* set options specified by user. */ 2058 m = sockopt_getmbuf(sopt); 2059 if (m == NULL) { 2060 free(opt, M_IP6OPT); 2061 return (ENOBUFS); 2062 } 2063 2064 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2065 so->so_proto->pr_protocol); 2066 m_freem(m); 2067 if (error != 0) { 2068 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2069 free(opt, M_IP6OPT); 2070 return (error); 2071 } 2072 *pktopt = opt; 2073 return (0); 2074 } 2075 #endif 2076 2077 /* 2078 * initialize ip6_pktopts. beware that there are non-zero default values in 2079 * the struct. 2080 */ 2081 void 2082 ip6_initpktopts(struct ip6_pktopts *opt) 2083 { 2084 2085 memset(opt, 0, sizeof(*opt)); 2086 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2087 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2088 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2089 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2090 } 2091 2092 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2093 static int 2094 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2095 kauth_cred_t cred, int uproto) 2096 { 2097 struct ip6_pktopts *opt; 2098 2099 if (*pktopt == NULL) { 2100 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2101 M_NOWAIT); 2102 if (*pktopt == NULL) 2103 return (ENOBUFS); 2104 2105 ip6_initpktopts(*pktopt); 2106 } 2107 opt = *pktopt; 2108 2109 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2110 } 2111 2112 static int 2113 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2114 { 2115 void *optdata = NULL; 2116 int optdatalen = 0; 2117 struct ip6_ext *ip6e; 2118 int error = 0; 2119 struct in6_pktinfo null_pktinfo; 2120 int deftclass = 0, on; 2121 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2122 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2123 2124 switch (optname) { 2125 case IPV6_PKTINFO: 2126 if (pktopt && pktopt->ip6po_pktinfo) 2127 optdata = (void *)pktopt->ip6po_pktinfo; 2128 else { 2129 /* XXX: we don't have to do this every time... */ 2130 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2131 optdata = (void *)&null_pktinfo; 2132 } 2133 optdatalen = sizeof(struct in6_pktinfo); 2134 break; 2135 case IPV6_OTCLASS: 2136 /* XXX */ 2137 return (EINVAL); 2138 case IPV6_TCLASS: 2139 if (pktopt && pktopt->ip6po_tclass >= 0) 2140 optdata = (void *)&pktopt->ip6po_tclass; 2141 else 2142 optdata = (void *)&deftclass; 2143 optdatalen = sizeof(int); 2144 break; 2145 case IPV6_HOPOPTS: 2146 if (pktopt && pktopt->ip6po_hbh) { 2147 optdata = (void *)pktopt->ip6po_hbh; 2148 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2149 optdatalen = (ip6e->ip6e_len + 1) << 3; 2150 } 2151 break; 2152 case IPV6_RTHDR: 2153 if (pktopt && pktopt->ip6po_rthdr) { 2154 optdata = (void *)pktopt->ip6po_rthdr; 2155 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2156 optdatalen = (ip6e->ip6e_len + 1) << 3; 2157 } 2158 break; 2159 case IPV6_RTHDRDSTOPTS: 2160 if (pktopt && pktopt->ip6po_dest1) { 2161 optdata = (void *)pktopt->ip6po_dest1; 2162 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2163 optdatalen = (ip6e->ip6e_len + 1) << 3; 2164 } 2165 break; 2166 case IPV6_DSTOPTS: 2167 if (pktopt && pktopt->ip6po_dest2) { 2168 optdata = (void *)pktopt->ip6po_dest2; 2169 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2170 optdatalen = (ip6e->ip6e_len + 1) << 3; 2171 } 2172 break; 2173 case IPV6_NEXTHOP: 2174 if (pktopt && pktopt->ip6po_nexthop) { 2175 optdata = (void *)pktopt->ip6po_nexthop; 2176 optdatalen = pktopt->ip6po_nexthop->sa_len; 2177 } 2178 break; 2179 case IPV6_USE_MIN_MTU: 2180 if (pktopt) 2181 optdata = (void *)&pktopt->ip6po_minmtu; 2182 else 2183 optdata = (void *)&defminmtu; 2184 optdatalen = sizeof(int); 2185 break; 2186 case IPV6_DONTFRAG: 2187 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2188 on = 1; 2189 else 2190 on = 0; 2191 optdata = (void *)&on; 2192 optdatalen = sizeof(on); 2193 break; 2194 case IPV6_PREFER_TEMPADDR: 2195 if (pktopt) 2196 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2197 else 2198 optdata = (void *)&defpreftemp; 2199 optdatalen = sizeof(int); 2200 break; 2201 default: /* should not happen */ 2202 #ifdef DIAGNOSTIC 2203 panic("ip6_getpcbopt: unexpected option\n"); 2204 #endif 2205 return (ENOPROTOOPT); 2206 } 2207 2208 error = sockopt_set(sopt, optdata, optdatalen); 2209 2210 return (error); 2211 } 2212 2213 void 2214 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2215 { 2216 if (optname == -1 || optname == IPV6_PKTINFO) { 2217 if (pktopt->ip6po_pktinfo) 2218 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2219 pktopt->ip6po_pktinfo = NULL; 2220 } 2221 if (optname == -1 || optname == IPV6_HOPLIMIT) 2222 pktopt->ip6po_hlim = -1; 2223 if (optname == -1 || optname == IPV6_TCLASS) 2224 pktopt->ip6po_tclass = -1; 2225 if (optname == -1 || optname == IPV6_NEXTHOP) { 2226 rtcache_free(&pktopt->ip6po_nextroute); 2227 if (pktopt->ip6po_nexthop) 2228 free(pktopt->ip6po_nexthop, M_IP6OPT); 2229 pktopt->ip6po_nexthop = NULL; 2230 } 2231 if (optname == -1 || optname == IPV6_HOPOPTS) { 2232 if (pktopt->ip6po_hbh) 2233 free(pktopt->ip6po_hbh, M_IP6OPT); 2234 pktopt->ip6po_hbh = NULL; 2235 } 2236 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2237 if (pktopt->ip6po_dest1) 2238 free(pktopt->ip6po_dest1, M_IP6OPT); 2239 pktopt->ip6po_dest1 = NULL; 2240 } 2241 if (optname == -1 || optname == IPV6_RTHDR) { 2242 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2243 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2244 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2245 rtcache_free(&pktopt->ip6po_route); 2246 } 2247 if (optname == -1 || optname == IPV6_DSTOPTS) { 2248 if (pktopt->ip6po_dest2) 2249 free(pktopt->ip6po_dest2, M_IP6OPT); 2250 pktopt->ip6po_dest2 = NULL; 2251 } 2252 } 2253 2254 #define PKTOPT_EXTHDRCPY(type) \ 2255 do { \ 2256 if (src->type) { \ 2257 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2258 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2259 if (dst->type == NULL) \ 2260 goto bad; \ 2261 memcpy(dst->type, src->type, hlen); \ 2262 } \ 2263 } while (/*CONSTCOND*/ 0) 2264 2265 static int 2266 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2267 { 2268 dst->ip6po_hlim = src->ip6po_hlim; 2269 dst->ip6po_tclass = src->ip6po_tclass; 2270 dst->ip6po_flags = src->ip6po_flags; 2271 dst->ip6po_minmtu = src->ip6po_minmtu; 2272 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2273 if (src->ip6po_pktinfo) { 2274 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2275 M_IP6OPT, canwait); 2276 if (dst->ip6po_pktinfo == NULL) 2277 goto bad; 2278 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2279 } 2280 if (src->ip6po_nexthop) { 2281 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2282 M_IP6OPT, canwait); 2283 if (dst->ip6po_nexthop == NULL) 2284 goto bad; 2285 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2286 src->ip6po_nexthop->sa_len); 2287 } 2288 PKTOPT_EXTHDRCPY(ip6po_hbh); 2289 PKTOPT_EXTHDRCPY(ip6po_dest1); 2290 PKTOPT_EXTHDRCPY(ip6po_dest2); 2291 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2292 return (0); 2293 2294 bad: 2295 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2296 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2297 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2298 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2299 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2300 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2301 2302 return (ENOBUFS); 2303 } 2304 #undef PKTOPT_EXTHDRCPY 2305 2306 struct ip6_pktopts * 2307 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2308 { 2309 int error; 2310 struct ip6_pktopts *dst; 2311 2312 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2313 if (dst == NULL) 2314 return (NULL); 2315 ip6_initpktopts(dst); 2316 2317 if ((error = copypktopts(dst, src, canwait)) != 0) { 2318 free(dst, M_IP6OPT); 2319 return (NULL); 2320 } 2321 2322 return (dst); 2323 } 2324 2325 void 2326 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2327 { 2328 if (pktopt == NULL) 2329 return; 2330 2331 ip6_clearpktopts(pktopt, -1); 2332 2333 free(pktopt, M_IP6OPT); 2334 } 2335 2336 int 2337 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, 2338 struct psref *psref, void *v, size_t l) 2339 { 2340 struct ipv6_mreq mreq; 2341 int error; 2342 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2343 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2344 2345 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2346 if (error != 0) 2347 return error; 2348 2349 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2350 /* 2351 * We use the unspecified address to specify to accept 2352 * all multicast addresses. Only super user is allowed 2353 * to do this. 2354 */ 2355 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, 2356 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2357 return EACCES; 2358 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2359 // Don't bother if we are not going to use ifp. 2360 if (l == sizeof(*ia)) { 2361 memcpy(v, ia, l); 2362 return 0; 2363 } 2364 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2365 return EINVAL; 2366 } 2367 2368 /* 2369 * If no interface was explicitly specified, choose an 2370 * appropriate one according to the given multicast address. 2371 */ 2372 if (mreq.ipv6mr_interface == 0) { 2373 struct rtentry *rt; 2374 union { 2375 struct sockaddr dst; 2376 struct sockaddr_in dst4; 2377 struct sockaddr_in6 dst6; 2378 } u; 2379 struct route ro; 2380 2381 /* 2382 * Look up the routing table for the 2383 * address, and choose the outgoing interface. 2384 * XXX: is it a good approach? 2385 */ 2386 memset(&ro, 0, sizeof(ro)); 2387 if (IN6_IS_ADDR_V4MAPPED(ia)) 2388 sockaddr_in_init(&u.dst4, ia4, 0); 2389 else 2390 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2391 error = rtcache_setdst(&ro, &u.dst); 2392 if (error != 0) 2393 return error; 2394 rt = rtcache_init(&ro); 2395 *ifp = rt != NULL ? 2396 if_get_byindex(rt->rt_ifp->if_index, psref) : NULL; 2397 rtcache_unref(rt, &ro); 2398 rtcache_free(&ro); 2399 } else { 2400 /* 2401 * If the interface is specified, validate it. 2402 */ 2403 *ifp = if_get_byindex(mreq.ipv6mr_interface, psref); 2404 if (*ifp == NULL) 2405 return ENXIO; /* XXX EINVAL? */ 2406 } 2407 if (sizeof(*ia) == l) 2408 memcpy(v, ia, l); 2409 else 2410 memcpy(v, ia4, l); 2411 return 0; 2412 } 2413 2414 /* 2415 * Set the IP6 multicast options in response to user setsockopt(). 2416 */ 2417 static int 2418 ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) 2419 { 2420 int error = 0; 2421 u_int loop, ifindex; 2422 struct ipv6_mreq mreq; 2423 struct in6_addr ia; 2424 struct ifnet *ifp; 2425 struct ip6_moptions *im6o = in6p->in6p_moptions; 2426 struct in6_multi_mship *imm; 2427 2428 KASSERT(in6p_locked(in6p)); 2429 2430 if (im6o == NULL) { 2431 /* 2432 * No multicast option buffer attached to the pcb; 2433 * allocate one and initialize to default values. 2434 */ 2435 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2436 if (im6o == NULL) 2437 return (ENOBUFS); 2438 in6p->in6p_moptions = im6o; 2439 im6o->im6o_multicast_if_index = 0; 2440 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2441 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2442 LIST_INIT(&im6o->im6o_memberships); 2443 } 2444 2445 switch (sopt->sopt_name) { 2446 2447 case IPV6_MULTICAST_IF: { 2448 int s; 2449 /* 2450 * Select the interface for outgoing multicast packets. 2451 */ 2452 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2453 if (error != 0) 2454 break; 2455 2456 s = pserialize_read_enter(); 2457 if (ifindex != 0) { 2458 if ((ifp = if_byindex(ifindex)) == NULL) { 2459 pserialize_read_exit(s); 2460 error = ENXIO; /* XXX EINVAL? */ 2461 break; 2462 } 2463 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2464 pserialize_read_exit(s); 2465 error = EADDRNOTAVAIL; 2466 break; 2467 } 2468 } else 2469 ifp = NULL; 2470 im6o->im6o_multicast_if_index = if_get_index(ifp); 2471 pserialize_read_exit(s); 2472 break; 2473 } 2474 2475 case IPV6_MULTICAST_HOPS: 2476 { 2477 /* 2478 * Set the IP6 hoplimit for outgoing multicast packets. 2479 */ 2480 int optval; 2481 2482 error = sockopt_getint(sopt, &optval); 2483 if (error != 0) 2484 break; 2485 2486 if (optval < -1 || optval >= 256) 2487 error = EINVAL; 2488 else if (optval == -1) 2489 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2490 else 2491 im6o->im6o_multicast_hlim = optval; 2492 break; 2493 } 2494 2495 case IPV6_MULTICAST_LOOP: 2496 /* 2497 * Set the loopback flag for outgoing multicast packets. 2498 * Must be zero or one. 2499 */ 2500 error = sockopt_get(sopt, &loop, sizeof(loop)); 2501 if (error != 0) 2502 break; 2503 if (loop > 1) { 2504 error = EINVAL; 2505 break; 2506 } 2507 im6o->im6o_multicast_loop = loop; 2508 break; 2509 2510 case IPV6_JOIN_GROUP: { 2511 int bound; 2512 struct psref psref; 2513 /* 2514 * Add a multicast group membership. 2515 * Group must be a valid IP6 multicast address. 2516 */ 2517 bound = curlwp_bind(); 2518 ifp = NULL; 2519 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 2520 if (error != 0) { 2521 KASSERT(ifp == NULL); 2522 curlwp_bindx(bound); 2523 return error; 2524 } 2525 2526 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2527 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2528 goto put_break; 2529 } 2530 /* 2531 * See if we found an interface, and confirm that it 2532 * supports multicast 2533 */ 2534 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2535 error = EADDRNOTAVAIL; 2536 goto put_break; 2537 } 2538 2539 if (in6_setscope(&ia, ifp, NULL)) { 2540 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2541 goto put_break; 2542 } 2543 2544 /* 2545 * See if the membership already exists. 2546 */ 2547 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2548 if (imm->i6mm_maddr->in6m_ifp == ifp && 2549 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2550 &ia)) 2551 goto put_break; 2552 } 2553 if (imm != NULL) { 2554 error = EADDRINUSE; 2555 goto put_break; 2556 } 2557 /* 2558 * Everything looks good; add a new record to the multicast 2559 * address list for the given interface. 2560 */ 2561 IFNET_LOCK(ifp); 2562 imm = in6_joingroup(ifp, &ia, &error, 0); 2563 IFNET_UNLOCK(ifp); 2564 if (imm == NULL) 2565 goto put_break; 2566 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2567 put_break: 2568 if_put(ifp, &psref); 2569 curlwp_bindx(bound); 2570 break; 2571 } 2572 2573 case IPV6_LEAVE_GROUP: { 2574 struct ifnet *in6m_ifp; 2575 /* 2576 * Drop a multicast group membership. 2577 * Group must be a valid IP6 multicast address. 2578 */ 2579 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2580 if (error != 0) 2581 break; 2582 2583 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2584 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2585 break; 2586 } 2587 /* 2588 * If an interface address was specified, get a pointer 2589 * to its ifnet structure. 2590 */ 2591 if (mreq.ipv6mr_interface != 0) { 2592 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2593 error = ENXIO; /* XXX EINVAL? */ 2594 break; 2595 } 2596 } else 2597 ifp = NULL; 2598 2599 /* Fill in the scope zone ID */ 2600 if (ifp) { 2601 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2602 /* XXX: should not happen */ 2603 error = EADDRNOTAVAIL; 2604 break; 2605 } 2606 } else if (mreq.ipv6mr_interface != 0) { 2607 /* 2608 * XXX: This case would happens when the (positive) 2609 * index is in the valid range, but the corresponding 2610 * interface has been detached dynamically. The above 2611 * check probably avoids such case to happen here, but 2612 * we check it explicitly for safety. 2613 */ 2614 error = EADDRNOTAVAIL; 2615 break; 2616 } else { /* ipv6mr_interface == 0 */ 2617 struct sockaddr_in6 sa6_mc; 2618 2619 /* 2620 * The API spec says as follows: 2621 * If the interface index is specified as 0, the 2622 * system may choose a multicast group membership to 2623 * drop by matching the multicast address only. 2624 * On the other hand, we cannot disambiguate the scope 2625 * zone unless an interface is provided. Thus, we 2626 * check if there's ambiguity with the default scope 2627 * zone as the last resort. 2628 */ 2629 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2630 0, 0, 0); 2631 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2632 if (error != 0) 2633 break; 2634 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2635 } 2636 2637 /* 2638 * Find the membership in the membership list. 2639 */ 2640 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2641 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2642 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2643 &mreq.ipv6mr_multiaddr)) 2644 break; 2645 } 2646 if (imm == NULL) { 2647 /* Unable to resolve interface */ 2648 error = EADDRNOTAVAIL; 2649 break; 2650 } 2651 /* 2652 * Give up the multicast address record to which the 2653 * membership points. 2654 */ 2655 LIST_REMOVE(imm, i6mm_chain); 2656 in6m_ifp = imm->i6mm_maddr->in6m_ifp; 2657 IFNET_LOCK(in6m_ifp); 2658 in6_leavegroup(imm); 2659 /* in6m_ifp should not leave thanks to in6p_lock */ 2660 IFNET_UNLOCK(in6m_ifp); 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 struct ifnet *ifp; 2742 2743 LIST_REMOVE(imm, i6mm_chain); 2744 2745 ifp = imm->i6mm_maddr->in6m_ifp; 2746 IFNET_LOCK(ifp); 2747 in6_leavegroup(imm); 2748 /* ifp should not leave thanks to solock */ 2749 IFNET_UNLOCK(ifp); 2750 } 2751 free(im6o, M_IPMOPTS); 2752 } 2753 2754 /* 2755 * Set IPv6 outgoing packet options based on advanced API. 2756 */ 2757 int 2758 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2759 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2760 { 2761 struct cmsghdr *cm = 0; 2762 2763 if (control == NULL || opt == NULL) 2764 return (EINVAL); 2765 2766 ip6_initpktopts(opt); 2767 if (stickyopt) { 2768 int error; 2769 2770 /* 2771 * If stickyopt is provided, make a local copy of the options 2772 * for this particular packet, then override them by ancillary 2773 * objects. 2774 * XXX: copypktopts() does not copy the cached route to a next 2775 * hop (if any). This is not very good in terms of efficiency, 2776 * but we can allow this since this option should be rarely 2777 * used. 2778 */ 2779 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2780 return (error); 2781 } 2782 2783 /* 2784 * XXX: Currently, we assume all the optional information is stored 2785 * in a single mbuf. 2786 */ 2787 if (control->m_next) 2788 return (EINVAL); 2789 2790 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2791 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2792 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2793 int error; 2794 2795 if (control->m_len < CMSG_LEN(0)) 2796 return (EINVAL); 2797 2798 cm = mtod(control, struct cmsghdr *); 2799 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2800 return (EINVAL); 2801 if (cm->cmsg_level != IPPROTO_IPV6) 2802 continue; 2803 2804 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2805 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2806 if (error) 2807 return (error); 2808 } 2809 2810 return (0); 2811 } 2812 2813 /* 2814 * Set a particular packet option, as a sticky option or an ancillary data 2815 * item. "len" can be 0 only when it's a sticky option. 2816 * We have 4 cases of combination of "sticky" and "cmsg": 2817 * "sticky=0, cmsg=0": impossible 2818 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2819 * "sticky=1, cmsg=0": RFC3542 socket option 2820 * "sticky=1, cmsg=1": RFC2292 socket option 2821 */ 2822 static int 2823 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2824 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2825 { 2826 int minmtupolicy; 2827 int error; 2828 2829 if (!sticky && !cmsg) { 2830 #ifdef DIAGNOSTIC 2831 printf("ip6_setpktopt: impossible case\n"); 2832 #endif 2833 return (EINVAL); 2834 } 2835 2836 /* 2837 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2838 * not be specified in the context of RFC3542. Conversely, 2839 * RFC3542 types should not be specified in the context of RFC2292. 2840 */ 2841 if (!cmsg) { 2842 switch (optname) { 2843 case IPV6_2292PKTINFO: 2844 case IPV6_2292HOPLIMIT: 2845 case IPV6_2292NEXTHOP: 2846 case IPV6_2292HOPOPTS: 2847 case IPV6_2292DSTOPTS: 2848 case IPV6_2292RTHDR: 2849 case IPV6_2292PKTOPTIONS: 2850 return (ENOPROTOOPT); 2851 } 2852 } 2853 if (sticky && cmsg) { 2854 switch (optname) { 2855 case IPV6_PKTINFO: 2856 case IPV6_HOPLIMIT: 2857 case IPV6_NEXTHOP: 2858 case IPV6_HOPOPTS: 2859 case IPV6_DSTOPTS: 2860 case IPV6_RTHDRDSTOPTS: 2861 case IPV6_RTHDR: 2862 case IPV6_USE_MIN_MTU: 2863 case IPV6_DONTFRAG: 2864 case IPV6_OTCLASS: 2865 case IPV6_TCLASS: 2866 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2867 return (ENOPROTOOPT); 2868 } 2869 } 2870 2871 switch (optname) { 2872 #ifdef RFC2292 2873 case IPV6_2292PKTINFO: 2874 #endif 2875 case IPV6_PKTINFO: 2876 { 2877 struct in6_pktinfo *pktinfo; 2878 2879 if (len != sizeof(struct in6_pktinfo)) 2880 return (EINVAL); 2881 2882 pktinfo = (struct in6_pktinfo *)buf; 2883 2884 /* 2885 * An application can clear any sticky IPV6_PKTINFO option by 2886 * doing a "regular" setsockopt with ipi6_addr being 2887 * in6addr_any and ipi6_ifindex being zero. 2888 * [RFC 3542, Section 6] 2889 */ 2890 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2891 pktinfo->ipi6_ifindex == 0 && 2892 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2893 ip6_clearpktopts(opt, optname); 2894 break; 2895 } 2896 2897 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2898 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2899 return (EINVAL); 2900 } 2901 2902 /* Validate the interface index if specified. */ 2903 if (pktinfo->ipi6_ifindex) { 2904 struct ifnet *ifp; 2905 int s = pserialize_read_enter(); 2906 ifp = if_byindex(pktinfo->ipi6_ifindex); 2907 if (ifp == NULL) { 2908 pserialize_read_exit(s); 2909 return ENXIO; 2910 } 2911 pserialize_read_exit(s); 2912 } 2913 2914 /* 2915 * We store the address anyway, and let in6_selectsrc() 2916 * validate the specified address. This is because ipi6_addr 2917 * may not have enough information about its scope zone, and 2918 * we may need additional information (such as outgoing 2919 * interface or the scope zone of a destination address) to 2920 * disambiguate the scope. 2921 * XXX: the delay of the validation may confuse the 2922 * application when it is used as a sticky option. 2923 */ 2924 if (opt->ip6po_pktinfo == NULL) { 2925 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2926 M_IP6OPT, M_NOWAIT); 2927 if (opt->ip6po_pktinfo == NULL) 2928 return (ENOBUFS); 2929 } 2930 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2931 break; 2932 } 2933 2934 #ifdef RFC2292 2935 case IPV6_2292HOPLIMIT: 2936 #endif 2937 case IPV6_HOPLIMIT: 2938 { 2939 int *hlimp; 2940 2941 /* 2942 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2943 * to simplify the ordering among hoplimit options. 2944 */ 2945 if (optname == IPV6_HOPLIMIT && sticky) 2946 return (ENOPROTOOPT); 2947 2948 if (len != sizeof(int)) 2949 return (EINVAL); 2950 hlimp = (int *)buf; 2951 if (*hlimp < -1 || *hlimp > 255) 2952 return (EINVAL); 2953 2954 opt->ip6po_hlim = *hlimp; 2955 break; 2956 } 2957 2958 case IPV6_OTCLASS: 2959 if (len != sizeof(u_int8_t)) 2960 return (EINVAL); 2961 2962 opt->ip6po_tclass = *(u_int8_t *)buf; 2963 break; 2964 2965 case IPV6_TCLASS: 2966 { 2967 int tclass; 2968 2969 if (len != sizeof(int)) 2970 return (EINVAL); 2971 tclass = *(int *)buf; 2972 if (tclass < -1 || tclass > 255) 2973 return (EINVAL); 2974 2975 opt->ip6po_tclass = tclass; 2976 break; 2977 } 2978 2979 #ifdef RFC2292 2980 case IPV6_2292NEXTHOP: 2981 #endif 2982 case IPV6_NEXTHOP: 2983 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 2984 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 2985 if (error) 2986 return (error); 2987 2988 if (len == 0) { /* just remove the option */ 2989 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2990 break; 2991 } 2992 2993 /* check if cmsg_len is large enough for sa_len */ 2994 if (len < sizeof(struct sockaddr) || len < *buf) 2995 return (EINVAL); 2996 2997 switch (((struct sockaddr *)buf)->sa_family) { 2998 case AF_INET6: 2999 { 3000 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3001 3002 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3003 return (EINVAL); 3004 3005 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3006 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3007 return (EINVAL); 3008 } 3009 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3010 != 0) { 3011 return (error); 3012 } 3013 break; 3014 } 3015 case AF_LINK: /* eventually be supported? */ 3016 default: 3017 return (EAFNOSUPPORT); 3018 } 3019 3020 /* turn off the previous option, then set the new option. */ 3021 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3022 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3023 if (opt->ip6po_nexthop == NULL) 3024 return (ENOBUFS); 3025 memcpy(opt->ip6po_nexthop, buf, *buf); 3026 break; 3027 3028 #ifdef RFC2292 3029 case IPV6_2292HOPOPTS: 3030 #endif 3031 case IPV6_HOPOPTS: 3032 { 3033 struct ip6_hbh *hbh; 3034 int hbhlen; 3035 3036 /* 3037 * XXX: We don't allow a non-privileged user to set ANY HbH 3038 * options, since per-option restriction has too much 3039 * overhead. 3040 */ 3041 error = kauth_authorize_network(cred, 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, KAUTH_NETWORK_IPV6, 3080 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3081 if (error) 3082 return (error); 3083 3084 if (len == 0) { 3085 ip6_clearpktopts(opt, optname); 3086 break; /* just remove the option */ 3087 } 3088 3089 /* message length validation */ 3090 if (len < sizeof(struct ip6_dest)) 3091 return (EINVAL); 3092 dest = (struct ip6_dest *)buf; 3093 destlen = (dest->ip6d_len + 1) << 3; 3094 if (len != destlen) 3095 return (EINVAL); 3096 /* 3097 * Determine the position that the destination options header 3098 * should be inserted; before or after the routing header. 3099 */ 3100 switch (optname) { 3101 case IPV6_2292DSTOPTS: 3102 /* 3103 * The old advanced API is ambiguous on this point. 3104 * Our approach is to determine the position based 3105 * according to the existence of a routing header. 3106 * Note, however, that this depends on the order of the 3107 * extension headers in the ancillary data; the 1st 3108 * part of the destination options header must appear 3109 * before the routing header in the ancillary data, 3110 * too. 3111 * RFC3542 solved the ambiguity by introducing 3112 * separate ancillary data or option types. 3113 */ 3114 if (opt->ip6po_rthdr == NULL) 3115 newdest = &opt->ip6po_dest1; 3116 else 3117 newdest = &opt->ip6po_dest2; 3118 break; 3119 case IPV6_RTHDRDSTOPTS: 3120 newdest = &opt->ip6po_dest1; 3121 break; 3122 case IPV6_DSTOPTS: 3123 newdest = &opt->ip6po_dest2; 3124 break; 3125 } 3126 3127 /* turn off the previous option, then set the new option. */ 3128 ip6_clearpktopts(opt, optname); 3129 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3130 if (*newdest == NULL) 3131 return (ENOBUFS); 3132 memcpy(*newdest, dest, destlen); 3133 3134 break; 3135 } 3136 3137 #ifdef RFC2292 3138 case IPV6_2292RTHDR: 3139 #endif 3140 case IPV6_RTHDR: 3141 { 3142 struct ip6_rthdr *rth; 3143 int rthlen; 3144 3145 if (len == 0) { 3146 ip6_clearpktopts(opt, IPV6_RTHDR); 3147 break; /* just remove the option */ 3148 } 3149 3150 /* message length validation */ 3151 if (len < sizeof(struct ip6_rthdr)) 3152 return (EINVAL); 3153 rth = (struct ip6_rthdr *)buf; 3154 rthlen = (rth->ip6r_len + 1) << 3; 3155 if (len != rthlen) 3156 return (EINVAL); 3157 switch (rth->ip6r_type) { 3158 case IPV6_RTHDR_TYPE_0: 3159 /* Dropped, RFC5095. */ 3160 default: 3161 return (EINVAL); /* not supported */ 3162 } 3163 /* turn off the previous option */ 3164 ip6_clearpktopts(opt, IPV6_RTHDR); 3165 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3166 if (opt->ip6po_rthdr == NULL) 3167 return (ENOBUFS); 3168 memcpy(opt->ip6po_rthdr, rth, rthlen); 3169 break; 3170 } 3171 3172 case IPV6_USE_MIN_MTU: 3173 if (len != sizeof(int)) 3174 return (EINVAL); 3175 minmtupolicy = *(int *)buf; 3176 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3177 minmtupolicy != IP6PO_MINMTU_DISABLE && 3178 minmtupolicy != IP6PO_MINMTU_ALL) { 3179 return (EINVAL); 3180 } 3181 opt->ip6po_minmtu = minmtupolicy; 3182 break; 3183 3184 case IPV6_DONTFRAG: 3185 if (len != sizeof(int)) 3186 return (EINVAL); 3187 3188 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3189 /* 3190 * we ignore this option for TCP sockets. 3191 * (RFC3542 leaves this case unspecified.) 3192 */ 3193 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3194 } else 3195 opt->ip6po_flags |= IP6PO_DONTFRAG; 3196 break; 3197 3198 case IPV6_PREFER_TEMPADDR: 3199 { 3200 int preftemp; 3201 3202 if (len != sizeof(int)) 3203 return (EINVAL); 3204 preftemp = *(int *)buf; 3205 switch (preftemp) { 3206 case IP6PO_TEMPADDR_SYSTEM: 3207 case IP6PO_TEMPADDR_NOTPREFER: 3208 case IP6PO_TEMPADDR_PREFER: 3209 break; 3210 default: 3211 return (EINVAL); 3212 } 3213 opt->ip6po_prefer_tempaddr = preftemp; 3214 break; 3215 } 3216 3217 default: 3218 return (ENOPROTOOPT); 3219 } /* end of switch */ 3220 3221 return (0); 3222 } 3223 3224 /* 3225 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3226 * packet to the input queue of a specified interface. Note that this 3227 * calls the output routine of the loopback "driver", but with an interface 3228 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3229 */ 3230 void 3231 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3232 const struct sockaddr_in6 *dst) 3233 { 3234 struct mbuf *copym; 3235 struct ip6_hdr *ip6; 3236 3237 copym = m_copypacket(m, M_DONTWAIT); 3238 if (copym == NULL) 3239 return; 3240 3241 /* 3242 * Make sure to deep-copy IPv6 header portion in case the data 3243 * is in an mbuf cluster, so that we can safely override the IPv6 3244 * header portion later. 3245 */ 3246 if ((copym->m_flags & M_EXT) != 0 || 3247 copym->m_len < sizeof(struct ip6_hdr)) { 3248 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3249 if (copym == NULL) 3250 return; 3251 } 3252 3253 #ifdef DIAGNOSTIC 3254 if (copym->m_len < sizeof(*ip6)) { 3255 m_freem(copym); 3256 return; 3257 } 3258 #endif 3259 3260 ip6 = mtod(copym, struct ip6_hdr *); 3261 /* 3262 * clear embedded scope identifiers if necessary. 3263 * in6_clearscope will touch the addresses only when necessary. 3264 */ 3265 in6_clearscope(&ip6->ip6_src); 3266 in6_clearscope(&ip6->ip6_dst); 3267 3268 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3269 } 3270 3271 /* 3272 * Chop IPv6 header off from the payload. 3273 */ 3274 static int 3275 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3276 { 3277 struct mbuf *mh; 3278 struct ip6_hdr *ip6; 3279 3280 ip6 = mtod(m, struct ip6_hdr *); 3281 if (m->m_len > sizeof(*ip6)) { 3282 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3283 if (mh == NULL) { 3284 m_freem(m); 3285 return ENOBUFS; 3286 } 3287 M_MOVE_PKTHDR(mh, m); 3288 MH_ALIGN(mh, sizeof(*ip6)); 3289 m->m_len -= sizeof(*ip6); 3290 m->m_data += sizeof(*ip6); 3291 mh->m_next = m; 3292 mh->m_len = sizeof(*ip6); 3293 memcpy(mtod(mh, void *), (void *)ip6, sizeof(*ip6)); 3294 m = mh; 3295 } 3296 exthdrs->ip6e_ip6 = m; 3297 return 0; 3298 } 3299 3300 /* 3301 * Compute IPv6 extension header length. 3302 */ 3303 int 3304 ip6_optlen(struct in6pcb *in6p) 3305 { 3306 int len; 3307 3308 if (!in6p->in6p_outputopts) 3309 return 0; 3310 3311 len = 0; 3312 #define elen(x) \ 3313 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3314 3315 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3316 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3317 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3318 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3319 return len; 3320 #undef elen 3321 } 3322 3323 /* 3324 * Ensure sending address is valid. 3325 * Returns 0 on success, -1 if an error should be sent back or 1 3326 * if the packet could be dropped without error (protocol dependent). 3327 */ 3328 static int 3329 ip6_ifaddrvalid(const struct in6_addr *src, const struct in6_addr *dst) 3330 { 3331 struct sockaddr_in6 sin6; 3332 int s, error; 3333 struct ifaddr *ifa; 3334 struct in6_ifaddr *ia6; 3335 3336 if (IN6_IS_ADDR_UNSPECIFIED(src)) 3337 return 0; 3338 3339 memset(&sin6, 0, sizeof(sin6)); 3340 sin6.sin6_family = AF_INET6; 3341 sin6.sin6_len = sizeof(sin6); 3342 sin6.sin6_addr = *src; 3343 3344 s = pserialize_read_enter(); 3345 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 3346 if ((ia6 = ifatoia6(ifa)) == NULL || 3347 ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) 3348 error = -1; 3349 else if (ia6->ia6_flags & IN6_IFF_TENTATIVE) 3350 error = 1; 3351 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 3352 (sin6.sin6_addr = *dst, ifa_ifwithaddr(sin6tosa(&sin6)) == NULL)) 3353 /* Allow internal traffic to DETACHED addresses */ 3354 error = 1; 3355 else 3356 error = 0; 3357 pserialize_read_exit(s); 3358 3359 return error; 3360 } 3361
Indexes created Sun Sep 21 20:09:37 GMT 2025