ip6_output.c revision 1.203.2.3
1 /* $NetBSD: ip6_output.c,v 1.203.2.3 2018/05/21 04:36:16 pgoyette 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 1.203.2.3 2018/05/21 04:36:16 pgoyette 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_HL_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_HL_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 #if 0 /* see below */ 879 struct ip6ctlparam ip6cp; 880 u_int32_t mtu32; 881 #endif 882 883 if (mtu > IPV6_MAXPACKET) 884 mtu = IPV6_MAXPACKET; 885 886 #if 0 887 /* 888 * It is believed this code is a leftover from the 889 * development of the IPV6_RECVPATHMTU sockopt and 890 * associated work to implement RFC3542. 891 * It's not entirely clear what the intent of the API 892 * is at this point, so disable this code for now. 893 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 894 * will send notifications if the application requests. 895 */ 896 897 /* Notify a proper path MTU to applications. */ 898 mtu32 = (u_int32_t)mtu; 899 memset(&ip6cp, 0, sizeof(ip6cp)); 900 ip6cp.ip6c_cmdarg = (void *)&mtu32; 901 pfctlinput2(PRC_MSGSIZE, 902 rtcache_getdst(ro_pmtu), &ip6cp); 903 #endif 904 905 /* 906 * Must be able to put at least 8 bytes per fragment. 907 */ 908 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 909 if (len < 8) { 910 error = EMSGSIZE; 911 in6_ifstat_inc(ifp, ifs6_out_fragfail); 912 goto bad; 913 } 914 915 mnext = &m->m_nextpkt; 916 917 /* 918 * Change the next header field of the last header in the 919 * unfragmentable part. 920 */ 921 if (exthdrs.ip6e_rthdr) { 922 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 923 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 924 } else if (exthdrs.ip6e_dest1) { 925 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 926 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 927 } else if (exthdrs.ip6e_hbh) { 928 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 929 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 930 } else { 931 nextproto = ip6->ip6_nxt; 932 ip6->ip6_nxt = IPPROTO_FRAGMENT; 933 } 934 935 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 936 != 0) { 937 if (IN6_NEED_CHECKSUM(ifp, 938 m->m_pkthdr.csum_flags & 939 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 940 in6_delayed_cksum(m); 941 } 942 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 943 } 944 945 /* 946 * Loop through length of segment after first fragment, 947 * make new header and copy data of each part and link onto 948 * chain. 949 */ 950 m0 = m; 951 for (off = hlen; off < tlen; off += len) { 952 struct mbuf *mlast; 953 954 MGETHDR(m, M_DONTWAIT, MT_HEADER); 955 if (!m) { 956 error = ENOBUFS; 957 IP6_STATINC(IP6_STAT_ODROPPED); 958 goto sendorfree; 959 } 960 m_reset_rcvif(m); 961 m->m_flags = m0->m_flags & M_COPYFLAGS; 962 *mnext = m; 963 mnext = &m->m_nextpkt; 964 m->m_data += max_linkhdr; 965 mhip6 = mtod(m, struct ip6_hdr *); 966 *mhip6 = *ip6; 967 m->m_len = sizeof(*mhip6); 968 969 ip6f = NULL; 970 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 971 if (error) { 972 IP6_STATINC(IP6_STAT_ODROPPED); 973 goto sendorfree; 974 } 975 976 /* Fill in the Frag6 Header */ 977 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 978 if (off + len >= tlen) 979 len = tlen - off; 980 else 981 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 982 ip6f->ip6f_reserved = 0; 983 ip6f->ip6f_ident = id; 984 ip6f->ip6f_nxt = nextproto; 985 986 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 987 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 988 if ((m_frgpart = m_copym(m0, off, len, M_DONTWAIT)) == NULL) { 989 error = ENOBUFS; 990 IP6_STATINC(IP6_STAT_ODROPPED); 991 goto sendorfree; 992 } 993 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 994 ; 995 mlast->m_next = m_frgpart; 996 997 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 998 m_reset_rcvif(m); 999 IP6_STATINC(IP6_STAT_OFRAGMENTS); 1000 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1001 } 1002 1003 in6_ifstat_inc(ifp, ifs6_out_fragok); 1004 } 1005 1006 sendorfree: 1007 m = m0->m_nextpkt; 1008 m0->m_nextpkt = 0; 1009 m_freem(m0); 1010 for (m0 = m; m; m = m0) { 1011 m0 = m->m_nextpkt; 1012 m->m_nextpkt = 0; 1013 if (error == 0) { 1014 struct in6_ifaddr *ia6; 1015 int s; 1016 ip6 = mtod(m, struct ip6_hdr *); 1017 s = pserialize_read_enter(); 1018 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1019 if (ia6) { 1020 /* 1021 * Record statistics for this interface 1022 * address. 1023 */ 1024 ia6->ia_ifa.ifa_data.ifad_outbytes += 1025 m->m_pkthdr.len; 1026 } 1027 pserialize_read_exit(s); 1028 KASSERT(dst != NULL); 1029 error = ip6_if_output(ifp, origifp, m, dst, rt); 1030 } else 1031 m_freem(m); 1032 } 1033 1034 if (error == 0) 1035 IP6_STATINC(IP6_STAT_FRAGMENTED); 1036 1037 done: 1038 rtcache_unref(rt, ro); 1039 if (ro == &ip6route) 1040 rtcache_free(&ip6route); 1041 #ifdef IPSEC 1042 if (sp != NULL) 1043 KEY_SP_UNREF(&sp); 1044 #endif 1045 if_put(ifp, &psref); 1046 if (release_psref_ia) 1047 if_put(origifp, &psref_ia); 1048 curlwp_bindx(bound); 1049 1050 return error; 1051 1052 freehdrs: 1053 m_freem(exthdrs.ip6e_hbh); 1054 m_freem(exthdrs.ip6e_dest1); 1055 m_freem(exthdrs.ip6e_rthdr); 1056 m_freem(exthdrs.ip6e_dest2); 1057 /* FALLTHROUGH */ 1058 bad: 1059 m_freem(m); 1060 goto done; 1061 1062 badscope: 1063 IP6_STATINC(IP6_STAT_BADSCOPE); 1064 in6_ifstat_inc(origifp, ifs6_out_discard); 1065 if (error == 0) 1066 error = EHOSTUNREACH; /* XXX */ 1067 goto bad; 1068 } 1069 1070 static int 1071 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1072 { 1073 struct mbuf *m; 1074 1075 if (hlen > MCLBYTES) 1076 return ENOBUFS; /* XXX */ 1077 1078 MGET(m, M_DONTWAIT, MT_DATA); 1079 if (!m) 1080 return ENOBUFS; 1081 1082 if (hlen > MLEN) { 1083 MCLGET(m, M_DONTWAIT); 1084 if ((m->m_flags & M_EXT) == 0) { 1085 m_free(m); 1086 return ENOBUFS; 1087 } 1088 } 1089 m->m_len = hlen; 1090 if (hdr) 1091 memcpy(mtod(m, void *), hdr, hlen); 1092 1093 *mp = m; 1094 return 0; 1095 } 1096 1097 /* 1098 * Process a delayed payload checksum calculation. 1099 */ 1100 void 1101 in6_delayed_cksum(struct mbuf *m) 1102 { 1103 uint16_t csum, offset; 1104 1105 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1106 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1107 KASSERT((m->m_pkthdr.csum_flags 1108 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1109 1110 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1111 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1112 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1113 csum = 0xffff; 1114 } 1115 1116 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1117 if ((offset + sizeof(csum)) > m->m_len) { 1118 m_copyback(m, offset, sizeof(csum), &csum); 1119 } else { 1120 *(uint16_t *)(mtod(m, char *) + offset) = csum; 1121 } 1122 } 1123 1124 /* 1125 * Insert jumbo payload option. 1126 */ 1127 static int 1128 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1129 { 1130 struct mbuf *mopt; 1131 u_int8_t *optbuf; 1132 u_int32_t v; 1133 1134 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1135 1136 /* 1137 * If there is no hop-by-hop options header, allocate new one. 1138 * If there is one but it doesn't have enough space to store the 1139 * jumbo payload option, allocate a cluster to store the whole options. 1140 * Otherwise, use it to store the options. 1141 */ 1142 if (exthdrs->ip6e_hbh == NULL) { 1143 MGET(mopt, M_DONTWAIT, MT_DATA); 1144 if (mopt == 0) 1145 return (ENOBUFS); 1146 mopt->m_len = JUMBOOPTLEN; 1147 optbuf = mtod(mopt, u_int8_t *); 1148 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1149 exthdrs->ip6e_hbh = mopt; 1150 } else { 1151 struct ip6_hbh *hbh; 1152 1153 mopt = exthdrs->ip6e_hbh; 1154 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1155 const int oldoptlen = mopt->m_len; 1156 struct mbuf *n; 1157 1158 /* 1159 * Assumptions: 1160 * - exthdrs->ip6e_hbh is not referenced from places 1161 * other than exthdrs. 1162 * - exthdrs->ip6e_hbh is not an mbuf chain. 1163 */ 1164 KASSERT(mopt->m_next == NULL); 1165 1166 /* 1167 * Give up if the whole (new) hbh header does not fit 1168 * even in an mbuf cluster. 1169 */ 1170 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1171 return ENOBUFS; 1172 1173 /* 1174 * At this point, we must always prepare a cluster. 1175 */ 1176 MGET(n, M_DONTWAIT, MT_DATA); 1177 if (n) { 1178 MCLGET(n, M_DONTWAIT); 1179 if ((n->m_flags & M_EXT) == 0) { 1180 m_freem(n); 1181 n = NULL; 1182 } 1183 } 1184 if (!n) 1185 return ENOBUFS; 1186 1187 n->m_len = oldoptlen + JUMBOOPTLEN; 1188 bcopy(mtod(mopt, void *), mtod(n, void *), 1189 oldoptlen); 1190 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1191 m_freem(mopt); 1192 mopt = exthdrs->ip6e_hbh = n; 1193 } else { 1194 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1195 mopt->m_len += JUMBOOPTLEN; 1196 } 1197 optbuf[0] = IP6OPT_PADN; 1198 optbuf[1] = 0; 1199 1200 /* 1201 * Adjust the header length according to the pad and 1202 * the jumbo payload option. 1203 */ 1204 hbh = mtod(mopt, struct ip6_hbh *); 1205 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1206 } 1207 1208 /* fill in the option. */ 1209 optbuf[2] = IP6OPT_JUMBO; 1210 optbuf[3] = 4; 1211 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1212 memcpy(&optbuf[4], &v, sizeof(u_int32_t)); 1213 1214 /* finally, adjust the packet header length */ 1215 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1216 1217 return 0; 1218 #undef JUMBOOPTLEN 1219 } 1220 1221 /* 1222 * Insert fragment header and copy unfragmentable header portions. 1223 * 1224 * *frghdrp will not be read, and it is guaranteed that either an 1225 * error is returned or that *frghdrp will point to space allocated 1226 * for the fragment header. 1227 * 1228 * On entry, m contains: 1229 * IPv6 Header 1230 * On exit, it contains: 1231 * IPv6 Header -> Unfragmentable Part -> Frag6 Header 1232 */ 1233 static int 1234 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1235 struct ip6_frag **frghdrp) 1236 { 1237 struct mbuf *n, *mlast; 1238 1239 if (hlen > sizeof(struct ip6_hdr)) { 1240 n = m_copym(m0, sizeof(struct ip6_hdr), 1241 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1242 if (n == NULL) 1243 return ENOBUFS; 1244 m->m_next = n; 1245 } else 1246 n = m; 1247 1248 /* Search for the last mbuf of unfragmentable part. */ 1249 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1250 ; 1251 1252 if ((mlast->m_flags & M_EXT) == 0 && 1253 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1254 /* use the trailing space of the last mbuf for the fragment hdr */ 1255 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1256 mlast->m_len); 1257 mlast->m_len += sizeof(struct ip6_frag); 1258 } else { 1259 /* allocate a new mbuf for the fragment header */ 1260 struct mbuf *mfrg; 1261 1262 MGET(mfrg, M_DONTWAIT, MT_DATA); 1263 if (mfrg == NULL) 1264 return ENOBUFS; 1265 mfrg->m_len = sizeof(struct ip6_frag); 1266 *frghdrp = mtod(mfrg, struct ip6_frag *); 1267 mlast->m_next = mfrg; 1268 } 1269 1270 return 0; 1271 } 1272 1273 static int 1274 ip6_getpmtu(struct rtentry *rt, struct ifnet *ifp, u_long *mtup, 1275 int *alwaysfragp) 1276 { 1277 u_int32_t mtu = 0; 1278 int alwaysfrag = 0; 1279 int error = 0; 1280 1281 if (rt != NULL) { 1282 u_int32_t ifmtu; 1283 1284 if (ifp == NULL) 1285 ifp = rt->rt_ifp; 1286 ifmtu = IN6_LINKMTU(ifp); 1287 mtu = rt->rt_rmx.rmx_mtu; 1288 if (mtu == 0) 1289 mtu = ifmtu; 1290 else if (mtu < IPV6_MMTU) { 1291 /* 1292 * RFC2460 section 5, last paragraph: 1293 * if we record ICMPv6 too big message with 1294 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1295 * or smaller, with fragment header attached. 1296 * (fragment header is needed regardless from the 1297 * packet size, for translators to identify packets) 1298 */ 1299 alwaysfrag = 1; 1300 mtu = IPV6_MMTU; 1301 } else if (mtu > ifmtu) { 1302 /* 1303 * The MTU on the route is larger than the MTU on 1304 * the interface! This shouldn't happen, unless the 1305 * MTU of the interface has been changed after the 1306 * interface was brought up. Change the MTU in the 1307 * route to match the interface MTU (as long as the 1308 * field isn't locked). 1309 */ 1310 mtu = ifmtu; 1311 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1312 rt->rt_rmx.rmx_mtu = mtu; 1313 } 1314 } else if (ifp) { 1315 mtu = IN6_LINKMTU(ifp); 1316 } else 1317 error = EHOSTUNREACH; /* XXX */ 1318 1319 *mtup = mtu; 1320 if (alwaysfragp) 1321 *alwaysfragp = alwaysfrag; 1322 return (error); 1323 } 1324 1325 /* 1326 * IP6 socket option processing. 1327 */ 1328 int 1329 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1330 { 1331 int optdatalen, uproto; 1332 void *optdata; 1333 struct in6pcb *in6p = sotoin6pcb(so); 1334 struct ip_moptions **mopts; 1335 int error, optval; 1336 int level, optname; 1337 1338 KASSERT(solocked(so)); 1339 KASSERT(sopt != NULL); 1340 1341 level = sopt->sopt_level; 1342 optname = sopt->sopt_name; 1343 1344 error = optval = 0; 1345 uproto = (int)so->so_proto->pr_protocol; 1346 1347 switch (level) { 1348 case IPPROTO_IP: 1349 switch (optname) { 1350 case IP_ADD_MEMBERSHIP: 1351 case IP_DROP_MEMBERSHIP: 1352 case IP_MULTICAST_IF: 1353 case IP_MULTICAST_LOOP: 1354 case IP_MULTICAST_TTL: 1355 mopts = &in6p->in6p_v4moptions; 1356 switch (op) { 1357 case PRCO_GETOPT: 1358 return ip_getmoptions(*mopts, sopt); 1359 case PRCO_SETOPT: 1360 return ip_setmoptions(mopts, sopt); 1361 default: 1362 return EINVAL; 1363 } 1364 default: 1365 return ENOPROTOOPT; 1366 } 1367 case IPPROTO_IPV6: 1368 break; 1369 default: 1370 return ENOPROTOOPT; 1371 } 1372 switch (op) { 1373 case PRCO_SETOPT: 1374 switch (optname) { 1375 #ifdef RFC2292 1376 case IPV6_2292PKTOPTIONS: 1377 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1378 break; 1379 #endif 1380 1381 /* 1382 * Use of some Hop-by-Hop options or some 1383 * Destination options, might require special 1384 * privilege. That is, normal applications 1385 * (without special privilege) might be forbidden 1386 * from setting certain options in outgoing packets, 1387 * and might never see certain options in received 1388 * packets. [RFC 2292 Section 6] 1389 * KAME specific note: 1390 * KAME prevents non-privileged users from sending or 1391 * receiving ANY hbh/dst options in order to avoid 1392 * overhead of parsing options in the kernel. 1393 */ 1394 case IPV6_RECVHOPOPTS: 1395 case IPV6_RECVDSTOPTS: 1396 case IPV6_RECVRTHDRDSTOPTS: 1397 error = kauth_authorize_network(kauth_cred_get(), 1398 KAUTH_NETWORK_IPV6, KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, 1399 NULL, NULL, NULL); 1400 if (error) 1401 break; 1402 /* FALLTHROUGH */ 1403 case IPV6_UNICAST_HOPS: 1404 case IPV6_HOPLIMIT: 1405 case IPV6_FAITH: 1406 1407 case IPV6_RECVPKTINFO: 1408 case IPV6_RECVHOPLIMIT: 1409 case IPV6_RECVRTHDR: 1410 case IPV6_RECVPATHMTU: 1411 case IPV6_RECVTCLASS: 1412 case IPV6_V6ONLY: 1413 error = sockopt_getint(sopt, &optval); 1414 if (error) 1415 break; 1416 switch (optname) { 1417 case IPV6_UNICAST_HOPS: 1418 if (optval < -1 || optval >= 256) 1419 error = EINVAL; 1420 else { 1421 /* -1 = kernel default */ 1422 in6p->in6p_hops = optval; 1423 } 1424 break; 1425 #define OPTSET(bit) \ 1426 do { \ 1427 if (optval) \ 1428 in6p->in6p_flags |= (bit); \ 1429 else \ 1430 in6p->in6p_flags &= ~(bit); \ 1431 } while (/*CONSTCOND*/ 0) 1432 1433 #ifdef RFC2292 1434 #define OPTSET2292(bit) \ 1435 do { \ 1436 in6p->in6p_flags |= IN6P_RFC2292; \ 1437 if (optval) \ 1438 in6p->in6p_flags |= (bit); \ 1439 else \ 1440 in6p->in6p_flags &= ~(bit); \ 1441 } while (/*CONSTCOND*/ 0) 1442 #endif 1443 1444 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1445 1446 case IPV6_RECVPKTINFO: 1447 #ifdef RFC2292 1448 /* cannot mix with RFC2292 */ 1449 if (OPTBIT(IN6P_RFC2292)) { 1450 error = EINVAL; 1451 break; 1452 } 1453 #endif 1454 OPTSET(IN6P_PKTINFO); 1455 break; 1456 1457 case IPV6_HOPLIMIT: 1458 { 1459 struct ip6_pktopts **optp; 1460 1461 #ifdef RFC2292 1462 /* cannot mix with RFC2292 */ 1463 if (OPTBIT(IN6P_RFC2292)) { 1464 error = EINVAL; 1465 break; 1466 } 1467 #endif 1468 optp = &in6p->in6p_outputopts; 1469 error = ip6_pcbopt(IPV6_HOPLIMIT, 1470 (u_char *)&optval, 1471 sizeof(optval), 1472 optp, 1473 kauth_cred_get(), uproto); 1474 break; 1475 } 1476 1477 case IPV6_RECVHOPLIMIT: 1478 #ifdef RFC2292 1479 /* cannot mix with RFC2292 */ 1480 if (OPTBIT(IN6P_RFC2292)) { 1481 error = EINVAL; 1482 break; 1483 } 1484 #endif 1485 OPTSET(IN6P_HOPLIMIT); 1486 break; 1487 1488 case IPV6_RECVHOPOPTS: 1489 #ifdef RFC2292 1490 /* cannot mix with RFC2292 */ 1491 if (OPTBIT(IN6P_RFC2292)) { 1492 error = EINVAL; 1493 break; 1494 } 1495 #endif 1496 OPTSET(IN6P_HOPOPTS); 1497 break; 1498 1499 case IPV6_RECVDSTOPTS: 1500 #ifdef RFC2292 1501 /* cannot mix with RFC2292 */ 1502 if (OPTBIT(IN6P_RFC2292)) { 1503 error = EINVAL; 1504 break; 1505 } 1506 #endif 1507 OPTSET(IN6P_DSTOPTS); 1508 break; 1509 1510 case IPV6_RECVRTHDRDSTOPTS: 1511 #ifdef RFC2292 1512 /* cannot mix with RFC2292 */ 1513 if (OPTBIT(IN6P_RFC2292)) { 1514 error = EINVAL; 1515 break; 1516 } 1517 #endif 1518 OPTSET(IN6P_RTHDRDSTOPTS); 1519 break; 1520 1521 case IPV6_RECVRTHDR: 1522 #ifdef RFC2292 1523 /* cannot mix with RFC2292 */ 1524 if (OPTBIT(IN6P_RFC2292)) { 1525 error = EINVAL; 1526 break; 1527 } 1528 #endif 1529 OPTSET(IN6P_RTHDR); 1530 break; 1531 1532 case IPV6_FAITH: 1533 OPTSET(IN6P_FAITH); 1534 break; 1535 1536 case IPV6_RECVPATHMTU: 1537 /* 1538 * We ignore this option for TCP 1539 * sockets. 1540 * (RFC3542 leaves this case 1541 * unspecified.) 1542 */ 1543 if (uproto != IPPROTO_TCP) 1544 OPTSET(IN6P_MTU); 1545 break; 1546 1547 case IPV6_V6ONLY: 1548 /* 1549 * make setsockopt(IPV6_V6ONLY) 1550 * available only prior to bind(2). 1551 * see ipng mailing list, Jun 22 2001. 1552 */ 1553 if (in6p->in6p_lport || 1554 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1555 error = EINVAL; 1556 break; 1557 } 1558 #ifdef INET6_BINDV6ONLY 1559 if (!optval) 1560 error = EINVAL; 1561 #else 1562 OPTSET(IN6P_IPV6_V6ONLY); 1563 #endif 1564 break; 1565 case IPV6_RECVTCLASS: 1566 #ifdef RFC2292 1567 /* cannot mix with RFC2292 XXX */ 1568 if (OPTBIT(IN6P_RFC2292)) { 1569 error = EINVAL; 1570 break; 1571 } 1572 #endif 1573 OPTSET(IN6P_TCLASS); 1574 break; 1575 1576 } 1577 break; 1578 1579 case IPV6_OTCLASS: 1580 { 1581 struct ip6_pktopts **optp; 1582 u_int8_t tclass; 1583 1584 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1585 if (error) 1586 break; 1587 optp = &in6p->in6p_outputopts; 1588 error = ip6_pcbopt(optname, 1589 (u_char *)&tclass, 1590 sizeof(tclass), 1591 optp, 1592 kauth_cred_get(), uproto); 1593 break; 1594 } 1595 1596 case IPV6_TCLASS: 1597 case IPV6_DONTFRAG: 1598 case IPV6_USE_MIN_MTU: 1599 case IPV6_PREFER_TEMPADDR: 1600 error = sockopt_getint(sopt, &optval); 1601 if (error) 1602 break; 1603 { 1604 struct ip6_pktopts **optp; 1605 optp = &in6p->in6p_outputopts; 1606 error = ip6_pcbopt(optname, 1607 (u_char *)&optval, 1608 sizeof(optval), 1609 optp, 1610 kauth_cred_get(), uproto); 1611 break; 1612 } 1613 1614 #ifdef RFC2292 1615 case IPV6_2292PKTINFO: 1616 case IPV6_2292HOPLIMIT: 1617 case IPV6_2292HOPOPTS: 1618 case IPV6_2292DSTOPTS: 1619 case IPV6_2292RTHDR: 1620 /* RFC 2292 */ 1621 error = sockopt_getint(sopt, &optval); 1622 if (error) 1623 break; 1624 1625 switch (optname) { 1626 case IPV6_2292PKTINFO: 1627 OPTSET2292(IN6P_PKTINFO); 1628 break; 1629 case IPV6_2292HOPLIMIT: 1630 OPTSET2292(IN6P_HOPLIMIT); 1631 break; 1632 case IPV6_2292HOPOPTS: 1633 /* 1634 * Check super-user privilege. 1635 * See comments for IPV6_RECVHOPOPTS. 1636 */ 1637 error = 1638 kauth_authorize_network(kauth_cred_get(), 1639 KAUTH_NETWORK_IPV6, 1640 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1641 NULL, NULL); 1642 if (error) 1643 return (error); 1644 OPTSET2292(IN6P_HOPOPTS); 1645 break; 1646 case IPV6_2292DSTOPTS: 1647 error = 1648 kauth_authorize_network(kauth_cred_get(), 1649 KAUTH_NETWORK_IPV6, 1650 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, 1651 NULL, NULL); 1652 if (error) 1653 return (error); 1654 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1655 break; 1656 case IPV6_2292RTHDR: 1657 OPTSET2292(IN6P_RTHDR); 1658 break; 1659 } 1660 break; 1661 #endif 1662 case IPV6_PKTINFO: 1663 case IPV6_HOPOPTS: 1664 case IPV6_RTHDR: 1665 case IPV6_DSTOPTS: 1666 case IPV6_RTHDRDSTOPTS: 1667 case IPV6_NEXTHOP: { 1668 /* new advanced API (RFC3542) */ 1669 void *optbuf; 1670 int optbuflen; 1671 struct ip6_pktopts **optp; 1672 1673 #ifdef RFC2292 1674 /* cannot mix with RFC2292 */ 1675 if (OPTBIT(IN6P_RFC2292)) { 1676 error = EINVAL; 1677 break; 1678 } 1679 #endif 1680 1681 optbuflen = sopt->sopt_size; 1682 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1683 if (optbuf == NULL) { 1684 error = ENOBUFS; 1685 break; 1686 } 1687 1688 error = sockopt_get(sopt, optbuf, optbuflen); 1689 if (error) { 1690 free(optbuf, M_IP6OPT); 1691 break; 1692 } 1693 optp = &in6p->in6p_outputopts; 1694 error = ip6_pcbopt(optname, optbuf, optbuflen, 1695 optp, kauth_cred_get(), uproto); 1696 1697 free(optbuf, M_IP6OPT); 1698 break; 1699 } 1700 #undef OPTSET 1701 1702 case IPV6_MULTICAST_IF: 1703 case IPV6_MULTICAST_HOPS: 1704 case IPV6_MULTICAST_LOOP: 1705 case IPV6_JOIN_GROUP: 1706 case IPV6_LEAVE_GROUP: 1707 error = ip6_setmoptions(sopt, in6p); 1708 break; 1709 1710 case IPV6_PORTRANGE: 1711 error = sockopt_getint(sopt, &optval); 1712 if (error) 1713 break; 1714 1715 switch (optval) { 1716 case IPV6_PORTRANGE_DEFAULT: 1717 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1718 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1719 break; 1720 1721 case IPV6_PORTRANGE_HIGH: 1722 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1723 in6p->in6p_flags |= IN6P_HIGHPORT; 1724 break; 1725 1726 case IPV6_PORTRANGE_LOW: 1727 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1728 in6p->in6p_flags |= IN6P_LOWPORT; 1729 break; 1730 1731 default: 1732 error = EINVAL; 1733 break; 1734 } 1735 break; 1736 1737 case IPV6_PORTALGO: 1738 error = sockopt_getint(sopt, &optval); 1739 if (error) 1740 break; 1741 1742 error = portalgo_algo_index_select( 1743 (struct inpcb_hdr *)in6p, optval); 1744 break; 1745 1746 #if defined(IPSEC) 1747 case IPV6_IPSEC_POLICY: 1748 if (ipsec_enabled) { 1749 error = ipsec_set_policy(in6p, 1750 sopt->sopt_data, sopt->sopt_size, 1751 kauth_cred_get()); 1752 break; 1753 } 1754 /*FALLTHROUGH*/ 1755 #endif /* IPSEC */ 1756 1757 default: 1758 error = ENOPROTOOPT; 1759 break; 1760 } 1761 break; 1762 1763 case PRCO_GETOPT: 1764 switch (optname) { 1765 #ifdef RFC2292 1766 case IPV6_2292PKTOPTIONS: 1767 /* 1768 * RFC3542 (effectively) deprecated the 1769 * semantics of the 2292-style pktoptions. 1770 * Since it was not reliable in nature (i.e., 1771 * applications had to expect the lack of some 1772 * information after all), it would make sense 1773 * to simplify this part by always returning 1774 * empty data. 1775 */ 1776 break; 1777 #endif 1778 1779 case IPV6_RECVHOPOPTS: 1780 case IPV6_RECVDSTOPTS: 1781 case IPV6_RECVRTHDRDSTOPTS: 1782 case IPV6_UNICAST_HOPS: 1783 case IPV6_RECVPKTINFO: 1784 case IPV6_RECVHOPLIMIT: 1785 case IPV6_RECVRTHDR: 1786 case IPV6_RECVPATHMTU: 1787 1788 case IPV6_FAITH: 1789 case IPV6_V6ONLY: 1790 case IPV6_PORTRANGE: 1791 case IPV6_RECVTCLASS: 1792 switch (optname) { 1793 1794 case IPV6_RECVHOPOPTS: 1795 optval = OPTBIT(IN6P_HOPOPTS); 1796 break; 1797 1798 case IPV6_RECVDSTOPTS: 1799 optval = OPTBIT(IN6P_DSTOPTS); 1800 break; 1801 1802 case IPV6_RECVRTHDRDSTOPTS: 1803 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1804 break; 1805 1806 case IPV6_UNICAST_HOPS: 1807 optval = in6p->in6p_hops; 1808 break; 1809 1810 case IPV6_RECVPKTINFO: 1811 optval = OPTBIT(IN6P_PKTINFO); 1812 break; 1813 1814 case IPV6_RECVHOPLIMIT: 1815 optval = OPTBIT(IN6P_HOPLIMIT); 1816 break; 1817 1818 case IPV6_RECVRTHDR: 1819 optval = OPTBIT(IN6P_RTHDR); 1820 break; 1821 1822 case IPV6_RECVPATHMTU: 1823 optval = OPTBIT(IN6P_MTU); 1824 break; 1825 1826 case IPV6_FAITH: 1827 optval = OPTBIT(IN6P_FAITH); 1828 break; 1829 1830 case IPV6_V6ONLY: 1831 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1832 break; 1833 1834 case IPV6_PORTRANGE: 1835 { 1836 int flags; 1837 flags = in6p->in6p_flags; 1838 if (flags & IN6P_HIGHPORT) 1839 optval = IPV6_PORTRANGE_HIGH; 1840 else if (flags & IN6P_LOWPORT) 1841 optval = IPV6_PORTRANGE_LOW; 1842 else 1843 optval = 0; 1844 break; 1845 } 1846 case IPV6_RECVTCLASS: 1847 optval = OPTBIT(IN6P_TCLASS); 1848 break; 1849 1850 } 1851 if (error) 1852 break; 1853 error = sockopt_setint(sopt, optval); 1854 break; 1855 1856 case IPV6_PATHMTU: 1857 { 1858 u_long pmtu = 0; 1859 struct ip6_mtuinfo mtuinfo; 1860 struct route *ro = &in6p->in6p_route; 1861 struct rtentry *rt; 1862 union { 1863 struct sockaddr dst; 1864 struct sockaddr_in6 dst6; 1865 } u; 1866 1867 if (!(so->so_state & SS_ISCONNECTED)) 1868 return (ENOTCONN); 1869 /* 1870 * XXX: we dot not consider the case of source 1871 * routing, or optional information to specify 1872 * the outgoing interface. 1873 */ 1874 sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0); 1875 rt = rtcache_lookup(ro, &u.dst); 1876 error = ip6_getpmtu(rt, NULL, &pmtu, NULL); 1877 rtcache_unref(rt, ro); 1878 if (error) 1879 break; 1880 if (pmtu > IPV6_MAXPACKET) 1881 pmtu = IPV6_MAXPACKET; 1882 1883 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1884 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1885 optdata = (void *)&mtuinfo; 1886 optdatalen = sizeof(mtuinfo); 1887 if (optdatalen > MCLBYTES) 1888 return (EMSGSIZE); /* XXX */ 1889 error = sockopt_set(sopt, optdata, optdatalen); 1890 break; 1891 } 1892 1893 #ifdef RFC2292 1894 case IPV6_2292PKTINFO: 1895 case IPV6_2292HOPLIMIT: 1896 case IPV6_2292HOPOPTS: 1897 case IPV6_2292RTHDR: 1898 case IPV6_2292DSTOPTS: 1899 switch (optname) { 1900 case IPV6_2292PKTINFO: 1901 optval = OPTBIT(IN6P_PKTINFO); 1902 break; 1903 case IPV6_2292HOPLIMIT: 1904 optval = OPTBIT(IN6P_HOPLIMIT); 1905 break; 1906 case IPV6_2292HOPOPTS: 1907 optval = OPTBIT(IN6P_HOPOPTS); 1908 break; 1909 case IPV6_2292RTHDR: 1910 optval = OPTBIT(IN6P_RTHDR); 1911 break; 1912 case IPV6_2292DSTOPTS: 1913 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1914 break; 1915 } 1916 error = sockopt_setint(sopt, optval); 1917 break; 1918 #endif 1919 case IPV6_PKTINFO: 1920 case IPV6_HOPOPTS: 1921 case IPV6_RTHDR: 1922 case IPV6_DSTOPTS: 1923 case IPV6_RTHDRDSTOPTS: 1924 case IPV6_NEXTHOP: 1925 case IPV6_OTCLASS: 1926 case IPV6_TCLASS: 1927 case IPV6_DONTFRAG: 1928 case IPV6_USE_MIN_MTU: 1929 case IPV6_PREFER_TEMPADDR: 1930 error = ip6_getpcbopt(in6p->in6p_outputopts, 1931 optname, sopt); 1932 break; 1933 1934 case IPV6_MULTICAST_IF: 1935 case IPV6_MULTICAST_HOPS: 1936 case IPV6_MULTICAST_LOOP: 1937 case IPV6_JOIN_GROUP: 1938 case IPV6_LEAVE_GROUP: 1939 error = ip6_getmoptions(sopt, in6p); 1940 break; 1941 1942 case IPV6_PORTALGO: 1943 optval = ((struct inpcb_hdr *)in6p)->inph_portalgo; 1944 error = sockopt_setint(sopt, optval); 1945 break; 1946 1947 #if defined(IPSEC) 1948 case IPV6_IPSEC_POLICY: 1949 if (ipsec_used) { 1950 struct mbuf *m = NULL; 1951 1952 /* 1953 * XXX: this will return EINVAL as sopt is 1954 * empty 1955 */ 1956 error = ipsec_get_policy(in6p, sopt->sopt_data, 1957 sopt->sopt_size, &m); 1958 if (!error) 1959 error = sockopt_setmbuf(sopt, m); 1960 break; 1961 } 1962 /*FALLTHROUGH*/ 1963 #endif /* IPSEC */ 1964 1965 default: 1966 error = ENOPROTOOPT; 1967 break; 1968 } 1969 break; 1970 } 1971 return (error); 1972 } 1973 1974 int 1975 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1976 { 1977 int error = 0, optval; 1978 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1979 struct in6pcb *in6p = sotoin6pcb(so); 1980 int level, optname; 1981 1982 KASSERT(sopt != NULL); 1983 1984 level = sopt->sopt_level; 1985 optname = sopt->sopt_name; 1986 1987 if (level != IPPROTO_IPV6) { 1988 return ENOPROTOOPT; 1989 } 1990 1991 switch (optname) { 1992 case IPV6_CHECKSUM: 1993 /* 1994 * For ICMPv6 sockets, no modification allowed for checksum 1995 * offset, permit "no change" values to help existing apps. 1996 * 1997 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 1998 * for an ICMPv6 socket will fail." The current 1999 * behavior does not meet RFC3542. 2000 */ 2001 switch (op) { 2002 case PRCO_SETOPT: 2003 error = sockopt_getint(sopt, &optval); 2004 if (error) 2005 break; 2006 if ((optval % 2) != 0) { 2007 /* the API assumes even offset values */ 2008 error = EINVAL; 2009 } else if (so->so_proto->pr_protocol == 2010 IPPROTO_ICMPV6) { 2011 if (optval != icmp6off) 2012 error = EINVAL; 2013 } else 2014 in6p->in6p_cksum = optval; 2015 break; 2016 2017 case PRCO_GETOPT: 2018 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2019 optval = icmp6off; 2020 else 2021 optval = in6p->in6p_cksum; 2022 2023 error = sockopt_setint(sopt, optval); 2024 break; 2025 2026 default: 2027 error = EINVAL; 2028 break; 2029 } 2030 break; 2031 2032 default: 2033 error = ENOPROTOOPT; 2034 break; 2035 } 2036 2037 return (error); 2038 } 2039 2040 #ifdef RFC2292 2041 /* 2042 * Set up IP6 options in pcb for insertion in output packets or 2043 * specifying behavior of outgoing packets. 2044 */ 2045 static int 2046 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 2047 struct sockopt *sopt) 2048 { 2049 struct ip6_pktopts *opt = *pktopt; 2050 struct mbuf *m; 2051 int error = 0; 2052 2053 KASSERT(solocked(so)); 2054 2055 /* turn off any old options. */ 2056 if (opt) { 2057 #ifdef DIAGNOSTIC 2058 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2059 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2060 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2061 printf("ip6_pcbopts: all specified options are cleared.\n"); 2062 #endif 2063 ip6_clearpktopts(opt, -1); 2064 } else { 2065 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2066 if (opt == NULL) 2067 return (ENOBUFS); 2068 } 2069 *pktopt = NULL; 2070 2071 if (sopt == NULL || sopt->sopt_size == 0) { 2072 /* 2073 * Only turning off any previous options, regardless of 2074 * whether the opt is just created or given. 2075 */ 2076 free(opt, M_IP6OPT); 2077 return (0); 2078 } 2079 2080 /* set options specified by user. */ 2081 m = sockopt_getmbuf(sopt); 2082 if (m == NULL) { 2083 free(opt, M_IP6OPT); 2084 return (ENOBUFS); 2085 } 2086 2087 error = ip6_setpktopts(m, opt, NULL, kauth_cred_get(), 2088 so->so_proto->pr_protocol); 2089 m_freem(m); 2090 if (error != 0) { 2091 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2092 free(opt, M_IP6OPT); 2093 return (error); 2094 } 2095 *pktopt = opt; 2096 return (0); 2097 } 2098 #endif 2099 2100 /* 2101 * initialize ip6_pktopts. beware that there are non-zero default values in 2102 * the struct. 2103 */ 2104 void 2105 ip6_initpktopts(struct ip6_pktopts *opt) 2106 { 2107 2108 memset(opt, 0, sizeof(*opt)); 2109 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2110 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2111 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2112 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2113 } 2114 2115 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2116 static int 2117 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2118 kauth_cred_t cred, int uproto) 2119 { 2120 struct ip6_pktopts *opt; 2121 2122 if (*pktopt == NULL) { 2123 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2124 M_NOWAIT); 2125 if (*pktopt == NULL) 2126 return (ENOBUFS); 2127 2128 ip6_initpktopts(*pktopt); 2129 } 2130 opt = *pktopt; 2131 2132 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2133 } 2134 2135 static int 2136 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2137 { 2138 void *optdata = NULL; 2139 int optdatalen = 0; 2140 struct ip6_ext *ip6e; 2141 int error = 0; 2142 struct in6_pktinfo null_pktinfo; 2143 int deftclass = 0, on; 2144 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2145 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2146 2147 switch (optname) { 2148 case IPV6_PKTINFO: 2149 if (pktopt && pktopt->ip6po_pktinfo) 2150 optdata = (void *)pktopt->ip6po_pktinfo; 2151 else { 2152 /* XXX: we don't have to do this every time... */ 2153 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2154 optdata = (void *)&null_pktinfo; 2155 } 2156 optdatalen = sizeof(struct in6_pktinfo); 2157 break; 2158 case IPV6_OTCLASS: 2159 /* XXX */ 2160 return (EINVAL); 2161 case IPV6_TCLASS: 2162 if (pktopt && pktopt->ip6po_tclass >= 0) 2163 optdata = (void *)&pktopt->ip6po_tclass; 2164 else 2165 optdata = (void *)&deftclass; 2166 optdatalen = sizeof(int); 2167 break; 2168 case IPV6_HOPOPTS: 2169 if (pktopt && pktopt->ip6po_hbh) { 2170 optdata = (void *)pktopt->ip6po_hbh; 2171 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2172 optdatalen = (ip6e->ip6e_len + 1) << 3; 2173 } 2174 break; 2175 case IPV6_RTHDR: 2176 if (pktopt && pktopt->ip6po_rthdr) { 2177 optdata = (void *)pktopt->ip6po_rthdr; 2178 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2179 optdatalen = (ip6e->ip6e_len + 1) << 3; 2180 } 2181 break; 2182 case IPV6_RTHDRDSTOPTS: 2183 if (pktopt && pktopt->ip6po_dest1) { 2184 optdata = (void *)pktopt->ip6po_dest1; 2185 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2186 optdatalen = (ip6e->ip6e_len + 1) << 3; 2187 } 2188 break; 2189 case IPV6_DSTOPTS: 2190 if (pktopt && pktopt->ip6po_dest2) { 2191 optdata = (void *)pktopt->ip6po_dest2; 2192 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2193 optdatalen = (ip6e->ip6e_len + 1) << 3; 2194 } 2195 break; 2196 case IPV6_NEXTHOP: 2197 if (pktopt && pktopt->ip6po_nexthop) { 2198 optdata = (void *)pktopt->ip6po_nexthop; 2199 optdatalen = pktopt->ip6po_nexthop->sa_len; 2200 } 2201 break; 2202 case IPV6_USE_MIN_MTU: 2203 if (pktopt) 2204 optdata = (void *)&pktopt->ip6po_minmtu; 2205 else 2206 optdata = (void *)&defminmtu; 2207 optdatalen = sizeof(int); 2208 break; 2209 case IPV6_DONTFRAG: 2210 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2211 on = 1; 2212 else 2213 on = 0; 2214 optdata = (void *)&on; 2215 optdatalen = sizeof(on); 2216 break; 2217 case IPV6_PREFER_TEMPADDR: 2218 if (pktopt) 2219 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2220 else 2221 optdata = (void *)&defpreftemp; 2222 optdatalen = sizeof(int); 2223 break; 2224 default: /* should not happen */ 2225 #ifdef DIAGNOSTIC 2226 panic("ip6_getpcbopt: unexpected option\n"); 2227 #endif 2228 return (ENOPROTOOPT); 2229 } 2230 2231 error = sockopt_set(sopt, optdata, optdatalen); 2232 2233 return (error); 2234 } 2235 2236 void 2237 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2238 { 2239 if (optname == -1 || optname == IPV6_PKTINFO) { 2240 if (pktopt->ip6po_pktinfo) 2241 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2242 pktopt->ip6po_pktinfo = NULL; 2243 } 2244 if (optname == -1 || optname == IPV6_HOPLIMIT) 2245 pktopt->ip6po_hlim = -1; 2246 if (optname == -1 || optname == IPV6_TCLASS) 2247 pktopt->ip6po_tclass = -1; 2248 if (optname == -1 || optname == IPV6_NEXTHOP) { 2249 rtcache_free(&pktopt->ip6po_nextroute); 2250 if (pktopt->ip6po_nexthop) 2251 free(pktopt->ip6po_nexthop, M_IP6OPT); 2252 pktopt->ip6po_nexthop = NULL; 2253 } 2254 if (optname == -1 || optname == IPV6_HOPOPTS) { 2255 if (pktopt->ip6po_hbh) 2256 free(pktopt->ip6po_hbh, M_IP6OPT); 2257 pktopt->ip6po_hbh = NULL; 2258 } 2259 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2260 if (pktopt->ip6po_dest1) 2261 free(pktopt->ip6po_dest1, M_IP6OPT); 2262 pktopt->ip6po_dest1 = NULL; 2263 } 2264 if (optname == -1 || optname == IPV6_RTHDR) { 2265 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2266 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2267 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2268 rtcache_free(&pktopt->ip6po_route); 2269 } 2270 if (optname == -1 || optname == IPV6_DSTOPTS) { 2271 if (pktopt->ip6po_dest2) 2272 free(pktopt->ip6po_dest2, M_IP6OPT); 2273 pktopt->ip6po_dest2 = NULL; 2274 } 2275 } 2276 2277 #define PKTOPT_EXTHDRCPY(type) \ 2278 do { \ 2279 if (src->type) { \ 2280 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2281 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2282 if (dst->type == NULL) \ 2283 goto bad; \ 2284 memcpy(dst->type, src->type, hlen); \ 2285 } \ 2286 } while (/*CONSTCOND*/ 0) 2287 2288 static int 2289 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2290 { 2291 dst->ip6po_hlim = src->ip6po_hlim; 2292 dst->ip6po_tclass = src->ip6po_tclass; 2293 dst->ip6po_flags = src->ip6po_flags; 2294 dst->ip6po_minmtu = src->ip6po_minmtu; 2295 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2296 if (src->ip6po_pktinfo) { 2297 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2298 M_IP6OPT, canwait); 2299 if (dst->ip6po_pktinfo == NULL) 2300 goto bad; 2301 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2302 } 2303 if (src->ip6po_nexthop) { 2304 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2305 M_IP6OPT, canwait); 2306 if (dst->ip6po_nexthop == NULL) 2307 goto bad; 2308 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2309 src->ip6po_nexthop->sa_len); 2310 } 2311 PKTOPT_EXTHDRCPY(ip6po_hbh); 2312 PKTOPT_EXTHDRCPY(ip6po_dest1); 2313 PKTOPT_EXTHDRCPY(ip6po_dest2); 2314 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2315 return (0); 2316 2317 bad: 2318 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2319 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2320 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2321 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2322 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2323 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2324 2325 return (ENOBUFS); 2326 } 2327 #undef PKTOPT_EXTHDRCPY 2328 2329 struct ip6_pktopts * 2330 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2331 { 2332 int error; 2333 struct ip6_pktopts *dst; 2334 2335 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2336 if (dst == NULL) 2337 return (NULL); 2338 ip6_initpktopts(dst); 2339 2340 if ((error = copypktopts(dst, src, canwait)) != 0) { 2341 free(dst, M_IP6OPT); 2342 return (NULL); 2343 } 2344 2345 return (dst); 2346 } 2347 2348 void 2349 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2350 { 2351 if (pktopt == NULL) 2352 return; 2353 2354 ip6_clearpktopts(pktopt, -1); 2355 2356 free(pktopt, M_IP6OPT); 2357 } 2358 2359 int 2360 ip6_get_membership(const struct sockopt *sopt, struct ifnet **ifp, 2361 struct psref *psref, void *v, size_t l) 2362 { 2363 struct ipv6_mreq mreq; 2364 int error; 2365 struct in6_addr *ia = &mreq.ipv6mr_multiaddr; 2366 struct in_addr *ia4 = (void *)&ia->s6_addr32[3]; 2367 2368 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2369 if (error != 0) 2370 return error; 2371 2372 if (IN6_IS_ADDR_UNSPECIFIED(ia)) { 2373 /* 2374 * We use the unspecified address to specify to accept 2375 * all multicast addresses. Only super user is allowed 2376 * to do this. 2377 */ 2378 if (kauth_authorize_network(curlwp->l_cred, KAUTH_NETWORK_IPV6, 2379 KAUTH_REQ_NETWORK_IPV6_JOIN_MULTICAST, NULL, NULL, NULL)) 2380 return EACCES; 2381 } else if (IN6_IS_ADDR_V4MAPPED(ia)) { 2382 // Don't bother if we are not going to use ifp. 2383 if (l == sizeof(*ia)) { 2384 memcpy(v, ia, l); 2385 return 0; 2386 } 2387 } else if (!IN6_IS_ADDR_MULTICAST(ia)) { 2388 return EINVAL; 2389 } 2390 2391 /* 2392 * If no interface was explicitly specified, choose an 2393 * appropriate one according to the given multicast address. 2394 */ 2395 if (mreq.ipv6mr_interface == 0) { 2396 struct rtentry *rt; 2397 union { 2398 struct sockaddr dst; 2399 struct sockaddr_in dst4; 2400 struct sockaddr_in6 dst6; 2401 } u; 2402 struct route ro; 2403 2404 /* 2405 * Look up the routing table for the 2406 * address, and choose the outgoing interface. 2407 * XXX: is it a good approach? 2408 */ 2409 memset(&ro, 0, sizeof(ro)); 2410 if (IN6_IS_ADDR_V4MAPPED(ia)) 2411 sockaddr_in_init(&u.dst4, ia4, 0); 2412 else 2413 sockaddr_in6_init(&u.dst6, ia, 0, 0, 0); 2414 error = rtcache_setdst(&ro, &u.dst); 2415 if (error != 0) 2416 return error; 2417 rt = rtcache_init(&ro); 2418 *ifp = rt != NULL ? 2419 if_get_byindex(rt->rt_ifp->if_index, psref) : NULL; 2420 rtcache_unref(rt, &ro); 2421 rtcache_free(&ro); 2422 } else { 2423 /* 2424 * If the interface is specified, validate it. 2425 */ 2426 *ifp = if_get_byindex(mreq.ipv6mr_interface, psref); 2427 if (*ifp == NULL) 2428 return ENXIO; /* XXX EINVAL? */ 2429 } 2430 if (sizeof(*ia) == l) 2431 memcpy(v, ia, l); 2432 else 2433 memcpy(v, ia4, l); 2434 return 0; 2435 } 2436 2437 /* 2438 * Set the IP6 multicast options in response to user setsockopt(). 2439 */ 2440 static int 2441 ip6_setmoptions(const struct sockopt *sopt, struct in6pcb *in6p) 2442 { 2443 int error = 0; 2444 u_int loop, ifindex; 2445 struct ipv6_mreq mreq; 2446 struct in6_addr ia; 2447 struct ifnet *ifp; 2448 struct ip6_moptions *im6o = in6p->in6p_moptions; 2449 struct in6_multi_mship *imm; 2450 2451 KASSERT(in6p_locked(in6p)); 2452 2453 if (im6o == NULL) { 2454 /* 2455 * No multicast option buffer attached to the pcb; 2456 * allocate one and initialize to default values. 2457 */ 2458 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2459 if (im6o == NULL) 2460 return (ENOBUFS); 2461 in6p->in6p_moptions = im6o; 2462 im6o->im6o_multicast_if_index = 0; 2463 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2464 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2465 LIST_INIT(&im6o->im6o_memberships); 2466 } 2467 2468 switch (sopt->sopt_name) { 2469 2470 case IPV6_MULTICAST_IF: { 2471 int s; 2472 /* 2473 * Select the interface for outgoing multicast packets. 2474 */ 2475 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2476 if (error != 0) 2477 break; 2478 2479 s = pserialize_read_enter(); 2480 if (ifindex != 0) { 2481 if ((ifp = if_byindex(ifindex)) == NULL) { 2482 pserialize_read_exit(s); 2483 error = ENXIO; /* XXX EINVAL? */ 2484 break; 2485 } 2486 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2487 pserialize_read_exit(s); 2488 error = EADDRNOTAVAIL; 2489 break; 2490 } 2491 } else 2492 ifp = NULL; 2493 im6o->im6o_multicast_if_index = if_get_index(ifp); 2494 pserialize_read_exit(s); 2495 break; 2496 } 2497 2498 case IPV6_MULTICAST_HOPS: 2499 { 2500 /* 2501 * Set the IP6 hoplimit for outgoing multicast packets. 2502 */ 2503 int optval; 2504 2505 error = sockopt_getint(sopt, &optval); 2506 if (error != 0) 2507 break; 2508 2509 if (optval < -1 || optval >= 256) 2510 error = EINVAL; 2511 else if (optval == -1) 2512 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2513 else 2514 im6o->im6o_multicast_hlim = optval; 2515 break; 2516 } 2517 2518 case IPV6_MULTICAST_LOOP: 2519 /* 2520 * Set the loopback flag for outgoing multicast packets. 2521 * Must be zero or one. 2522 */ 2523 error = sockopt_get(sopt, &loop, sizeof(loop)); 2524 if (error != 0) 2525 break; 2526 if (loop > 1) { 2527 error = EINVAL; 2528 break; 2529 } 2530 im6o->im6o_multicast_loop = loop; 2531 break; 2532 2533 case IPV6_JOIN_GROUP: { 2534 int bound; 2535 struct psref psref; 2536 /* 2537 * Add a multicast group membership. 2538 * Group must be a valid IP6 multicast address. 2539 */ 2540 bound = curlwp_bind(); 2541 ifp = NULL; 2542 error = ip6_get_membership(sopt, &ifp, &psref, &ia, sizeof(ia)); 2543 if (error != 0) { 2544 KASSERT(ifp == NULL); 2545 curlwp_bindx(bound); 2546 return error; 2547 } 2548 2549 if (IN6_IS_ADDR_V4MAPPED(&ia)) { 2550 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2551 goto put_break; 2552 } 2553 /* 2554 * See if we found an interface, and confirm that it 2555 * supports multicast 2556 */ 2557 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2558 error = EADDRNOTAVAIL; 2559 goto put_break; 2560 } 2561 2562 if (in6_setscope(&ia, ifp, NULL)) { 2563 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2564 goto put_break; 2565 } 2566 2567 /* 2568 * See if the membership already exists. 2569 */ 2570 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2571 if (imm->i6mm_maddr->in6m_ifp == ifp && 2572 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2573 &ia)) 2574 goto put_break; 2575 } 2576 if (imm != NULL) { 2577 error = EADDRINUSE; 2578 goto put_break; 2579 } 2580 /* 2581 * Everything looks good; add a new record to the multicast 2582 * address list for the given interface. 2583 */ 2584 IFNET_LOCK(ifp); 2585 imm = in6_joingroup(ifp, &ia, &error, 0); 2586 IFNET_UNLOCK(ifp); 2587 if (imm == NULL) 2588 goto put_break; 2589 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2590 put_break: 2591 if_put(ifp, &psref); 2592 curlwp_bindx(bound); 2593 break; 2594 } 2595 2596 case IPV6_LEAVE_GROUP: { 2597 struct ifnet *in6m_ifp; 2598 /* 2599 * Drop a multicast group membership. 2600 * Group must be a valid IP6 multicast address. 2601 */ 2602 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2603 if (error != 0) 2604 break; 2605 2606 if (IN6_IS_ADDR_V4MAPPED(&mreq.ipv6mr_multiaddr)) { 2607 error = ip_setmoptions(&in6p->in6p_v4moptions, sopt); 2608 break; 2609 } 2610 /* 2611 * If an interface address was specified, get a pointer 2612 * to its ifnet structure. 2613 */ 2614 if (mreq.ipv6mr_interface != 0) { 2615 if ((ifp = if_byindex(mreq.ipv6mr_interface)) == NULL) { 2616 error = ENXIO; /* XXX EINVAL? */ 2617 break; 2618 } 2619 } else 2620 ifp = NULL; 2621 2622 /* Fill in the scope zone ID */ 2623 if (ifp) { 2624 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2625 /* XXX: should not happen */ 2626 error = EADDRNOTAVAIL; 2627 break; 2628 } 2629 } else if (mreq.ipv6mr_interface != 0) { 2630 /* 2631 * XXX: This case would happens when the (positive) 2632 * index is in the valid range, but the corresponding 2633 * interface has been detached dynamically. The above 2634 * check probably avoids such case to happen here, but 2635 * we check it explicitly for safety. 2636 */ 2637 error = EADDRNOTAVAIL; 2638 break; 2639 } else { /* ipv6mr_interface == 0 */ 2640 struct sockaddr_in6 sa6_mc; 2641 2642 /* 2643 * The API spec says as follows: 2644 * If the interface index is specified as 0, the 2645 * system may choose a multicast group membership to 2646 * drop by matching the multicast address only. 2647 * On the other hand, we cannot disambiguate the scope 2648 * zone unless an interface is provided. Thus, we 2649 * check if there's ambiguity with the default scope 2650 * zone as the last resort. 2651 */ 2652 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2653 0, 0, 0); 2654 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2655 if (error != 0) 2656 break; 2657 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2658 } 2659 2660 /* 2661 * Find the membership in the membership list. 2662 */ 2663 LIST_FOREACH(imm, &im6o->im6o_memberships, i6mm_chain) { 2664 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2665 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2666 &mreq.ipv6mr_multiaddr)) 2667 break; 2668 } 2669 if (imm == NULL) { 2670 /* Unable to resolve interface */ 2671 error = EADDRNOTAVAIL; 2672 break; 2673 } 2674 /* 2675 * Give up the multicast address record to which the 2676 * membership points. 2677 */ 2678 LIST_REMOVE(imm, i6mm_chain); 2679 in6m_ifp = imm->i6mm_maddr->in6m_ifp; 2680 IFNET_LOCK(in6m_ifp); 2681 in6_leavegroup(imm); 2682 /* in6m_ifp should not leave thanks to in6p_lock */ 2683 IFNET_UNLOCK(in6m_ifp); 2684 break; 2685 } 2686 2687 default: 2688 error = EOPNOTSUPP; 2689 break; 2690 } 2691 2692 /* 2693 * If all options have default values, no need to keep the mbuf. 2694 */ 2695 if (im6o->im6o_multicast_if_index == 0 && 2696 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2697 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2698 LIST_EMPTY(&im6o->im6o_memberships)) { 2699 free(in6p->in6p_moptions, M_IPMOPTS); 2700 in6p->in6p_moptions = NULL; 2701 } 2702 2703 return (error); 2704 } 2705 2706 /* 2707 * Return the IP6 multicast options in response to user getsockopt(). 2708 */ 2709 static int 2710 ip6_getmoptions(struct sockopt *sopt, struct in6pcb *in6p) 2711 { 2712 u_int optval; 2713 int error; 2714 struct ip6_moptions *im6o = in6p->in6p_moptions; 2715 2716 switch (sopt->sopt_name) { 2717 case IPV6_MULTICAST_IF: 2718 if (im6o == NULL || im6o->im6o_multicast_if_index == 0) 2719 optval = 0; 2720 else 2721 optval = im6o->im6o_multicast_if_index; 2722 2723 error = sockopt_set(sopt, &optval, sizeof(optval)); 2724 break; 2725 2726 case IPV6_MULTICAST_HOPS: 2727 if (im6o == NULL) 2728 optval = ip6_defmcasthlim; 2729 else 2730 optval = im6o->im6o_multicast_hlim; 2731 2732 error = sockopt_set(sopt, &optval, sizeof(optval)); 2733 break; 2734 2735 case IPV6_MULTICAST_LOOP: 2736 if (im6o == NULL) 2737 optval = IPV6_DEFAULT_MULTICAST_LOOP; 2738 else 2739 optval = im6o->im6o_multicast_loop; 2740 2741 error = sockopt_set(sopt, &optval, sizeof(optval)); 2742 break; 2743 2744 default: 2745 error = EOPNOTSUPP; 2746 } 2747 2748 return (error); 2749 } 2750 2751 /* 2752 * Discard the IP6 multicast options. 2753 */ 2754 void 2755 ip6_freemoptions(struct ip6_moptions *im6o) 2756 { 2757 struct in6_multi_mship *imm, *nimm; 2758 2759 if (im6o == NULL) 2760 return; 2761 2762 /* The owner of im6o (in6p) should be protected by solock */ 2763 LIST_FOREACH_SAFE(imm, &im6o->im6o_memberships, i6mm_chain, nimm) { 2764 struct ifnet *ifp; 2765 2766 LIST_REMOVE(imm, i6mm_chain); 2767 2768 ifp = imm->i6mm_maddr->in6m_ifp; 2769 IFNET_LOCK(ifp); 2770 in6_leavegroup(imm); 2771 /* ifp should not leave thanks to solock */ 2772 IFNET_UNLOCK(ifp); 2773 } 2774 free(im6o, M_IPMOPTS); 2775 } 2776 2777 /* 2778 * Set IPv6 outgoing packet options based on advanced API. 2779 */ 2780 int 2781 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2782 struct ip6_pktopts *stickyopt, kauth_cred_t cred, int uproto) 2783 { 2784 struct cmsghdr *cm = 0; 2785 2786 if (control == NULL || opt == NULL) 2787 return (EINVAL); 2788 2789 ip6_initpktopts(opt); 2790 if (stickyopt) { 2791 int error; 2792 2793 /* 2794 * If stickyopt is provided, make a local copy of the options 2795 * for this particular packet, then override them by ancillary 2796 * objects. 2797 * XXX: copypktopts() does not copy the cached route to a next 2798 * hop (if any). This is not very good in terms of efficiency, 2799 * but we can allow this since this option should be rarely 2800 * used. 2801 */ 2802 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2803 return (error); 2804 } 2805 2806 /* 2807 * XXX: Currently, we assume all the optional information is stored 2808 * in a single mbuf. 2809 */ 2810 if (control->m_next) 2811 return (EINVAL); 2812 2813 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2814 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2815 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2816 int error; 2817 2818 if (control->m_len < CMSG_LEN(0)) 2819 return (EINVAL); 2820 2821 cm = mtod(control, struct cmsghdr *); 2822 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2823 return (EINVAL); 2824 if (cm->cmsg_level != IPPROTO_IPV6) 2825 continue; 2826 2827 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2828 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2829 if (error) 2830 return (error); 2831 } 2832 2833 return (0); 2834 } 2835 2836 /* 2837 * Set a particular packet option, as a sticky option or an ancillary data 2838 * item. "len" can be 0 only when it's a sticky option. 2839 * We have 4 cases of combination of "sticky" and "cmsg": 2840 * "sticky=0, cmsg=0": impossible 2841 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2842 * "sticky=1, cmsg=0": RFC3542 socket option 2843 * "sticky=1, cmsg=1": RFC2292 socket option 2844 */ 2845 static int 2846 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2847 kauth_cred_t cred, int sticky, int cmsg, int uproto) 2848 { 2849 int minmtupolicy; 2850 int error; 2851 2852 if (!sticky && !cmsg) { 2853 #ifdef DIAGNOSTIC 2854 printf("ip6_setpktopt: impossible case\n"); 2855 #endif 2856 return (EINVAL); 2857 } 2858 2859 /* 2860 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2861 * not be specified in the context of RFC3542. Conversely, 2862 * RFC3542 types should not be specified in the context of RFC2292. 2863 */ 2864 if (!cmsg) { 2865 switch (optname) { 2866 case IPV6_2292PKTINFO: 2867 case IPV6_2292HOPLIMIT: 2868 case IPV6_2292NEXTHOP: 2869 case IPV6_2292HOPOPTS: 2870 case IPV6_2292DSTOPTS: 2871 case IPV6_2292RTHDR: 2872 case IPV6_2292PKTOPTIONS: 2873 return (ENOPROTOOPT); 2874 } 2875 } 2876 if (sticky && cmsg) { 2877 switch (optname) { 2878 case IPV6_PKTINFO: 2879 case IPV6_HOPLIMIT: 2880 case IPV6_NEXTHOP: 2881 case IPV6_HOPOPTS: 2882 case IPV6_DSTOPTS: 2883 case IPV6_RTHDRDSTOPTS: 2884 case IPV6_RTHDR: 2885 case IPV6_USE_MIN_MTU: 2886 case IPV6_DONTFRAG: 2887 case IPV6_OTCLASS: 2888 case IPV6_TCLASS: 2889 case IPV6_PREFER_TEMPADDR: /* XXX not an RFC3542 option */ 2890 return (ENOPROTOOPT); 2891 } 2892 } 2893 2894 switch (optname) { 2895 #ifdef RFC2292 2896 case IPV6_2292PKTINFO: 2897 #endif 2898 case IPV6_PKTINFO: 2899 { 2900 struct in6_pktinfo *pktinfo; 2901 2902 if (len != sizeof(struct in6_pktinfo)) 2903 return (EINVAL); 2904 2905 pktinfo = (struct in6_pktinfo *)buf; 2906 2907 /* 2908 * An application can clear any sticky IPV6_PKTINFO option by 2909 * doing a "regular" setsockopt with ipi6_addr being 2910 * in6addr_any and ipi6_ifindex being zero. 2911 * [RFC 3542, Section 6] 2912 */ 2913 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2914 pktinfo->ipi6_ifindex == 0 && 2915 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2916 ip6_clearpktopts(opt, optname); 2917 break; 2918 } 2919 2920 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2921 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2922 return (EINVAL); 2923 } 2924 2925 /* Validate the interface index if specified. */ 2926 if (pktinfo->ipi6_ifindex) { 2927 struct ifnet *ifp; 2928 int s = pserialize_read_enter(); 2929 ifp = if_byindex(pktinfo->ipi6_ifindex); 2930 if (ifp == NULL) { 2931 pserialize_read_exit(s); 2932 return ENXIO; 2933 } 2934 pserialize_read_exit(s); 2935 } 2936 2937 /* 2938 * We store the address anyway, and let in6_selectsrc() 2939 * validate the specified address. This is because ipi6_addr 2940 * may not have enough information about its scope zone, and 2941 * we may need additional information (such as outgoing 2942 * interface or the scope zone of a destination address) to 2943 * disambiguate the scope. 2944 * XXX: the delay of the validation may confuse the 2945 * application when it is used as a sticky option. 2946 */ 2947 if (opt->ip6po_pktinfo == NULL) { 2948 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2949 M_IP6OPT, M_NOWAIT); 2950 if (opt->ip6po_pktinfo == NULL) 2951 return (ENOBUFS); 2952 } 2953 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2954 break; 2955 } 2956 2957 #ifdef RFC2292 2958 case IPV6_2292HOPLIMIT: 2959 #endif 2960 case IPV6_HOPLIMIT: 2961 { 2962 int *hlimp; 2963 2964 /* 2965 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2966 * to simplify the ordering among hoplimit options. 2967 */ 2968 if (optname == IPV6_HOPLIMIT && sticky) 2969 return (ENOPROTOOPT); 2970 2971 if (len != sizeof(int)) 2972 return (EINVAL); 2973 hlimp = (int *)buf; 2974 if (*hlimp < -1 || *hlimp > 255) 2975 return (EINVAL); 2976 2977 opt->ip6po_hlim = *hlimp; 2978 break; 2979 } 2980 2981 case IPV6_OTCLASS: 2982 if (len != sizeof(u_int8_t)) 2983 return (EINVAL); 2984 2985 opt->ip6po_tclass = *(u_int8_t *)buf; 2986 break; 2987 2988 case IPV6_TCLASS: 2989 { 2990 int tclass; 2991 2992 if (len != sizeof(int)) 2993 return (EINVAL); 2994 tclass = *(int *)buf; 2995 if (tclass < -1 || tclass > 255) 2996 return (EINVAL); 2997 2998 opt->ip6po_tclass = tclass; 2999 break; 3000 } 3001 3002 #ifdef RFC2292 3003 case IPV6_2292NEXTHOP: 3004 #endif 3005 case IPV6_NEXTHOP: 3006 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 3007 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3008 if (error) 3009 return (error); 3010 3011 if (len == 0) { /* just remove the option */ 3012 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3013 break; 3014 } 3015 3016 /* check if cmsg_len is large enough for sa_len */ 3017 if (len < sizeof(struct sockaddr) || len < *buf) 3018 return (EINVAL); 3019 3020 switch (((struct sockaddr *)buf)->sa_family) { 3021 case AF_INET6: 3022 { 3023 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3024 3025 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3026 return (EINVAL); 3027 3028 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3029 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3030 return (EINVAL); 3031 } 3032 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3033 != 0) { 3034 return (error); 3035 } 3036 break; 3037 } 3038 case AF_LINK: /* eventually be supported? */ 3039 default: 3040 return (EAFNOSUPPORT); 3041 } 3042 3043 /* turn off the previous option, then set the new option. */ 3044 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3045 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3046 if (opt->ip6po_nexthop == NULL) 3047 return (ENOBUFS); 3048 memcpy(opt->ip6po_nexthop, buf, *buf); 3049 break; 3050 3051 #ifdef RFC2292 3052 case IPV6_2292HOPOPTS: 3053 #endif 3054 case IPV6_HOPOPTS: 3055 { 3056 struct ip6_hbh *hbh; 3057 int hbhlen; 3058 3059 /* 3060 * XXX: We don't allow a non-privileged user to set ANY HbH 3061 * options, since per-option restriction has too much 3062 * overhead. 3063 */ 3064 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 3065 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3066 if (error) 3067 return (error); 3068 3069 if (len == 0) { 3070 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3071 break; /* just remove the option */ 3072 } 3073 3074 /* message length validation */ 3075 if (len < sizeof(struct ip6_hbh)) 3076 return (EINVAL); 3077 hbh = (struct ip6_hbh *)buf; 3078 hbhlen = (hbh->ip6h_len + 1) << 3; 3079 if (len != hbhlen) 3080 return (EINVAL); 3081 3082 /* turn off the previous option, then set the new option. */ 3083 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3084 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3085 if (opt->ip6po_hbh == NULL) 3086 return (ENOBUFS); 3087 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3088 3089 break; 3090 } 3091 3092 #ifdef RFC2292 3093 case IPV6_2292DSTOPTS: 3094 #endif 3095 case IPV6_DSTOPTS: 3096 case IPV6_RTHDRDSTOPTS: 3097 { 3098 struct ip6_dest *dest, **newdest = NULL; 3099 int destlen; 3100 3101 /* XXX: see the comment for IPV6_HOPOPTS */ 3102 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPV6, 3103 KAUTH_REQ_NETWORK_IPV6_HOPBYHOP, NULL, NULL, NULL); 3104 if (error) 3105 return (error); 3106 3107 if (len == 0) { 3108 ip6_clearpktopts(opt, optname); 3109 break; /* just remove the option */ 3110 } 3111 3112 /* message length validation */ 3113 if (len < sizeof(struct ip6_dest)) 3114 return (EINVAL); 3115 dest = (struct ip6_dest *)buf; 3116 destlen = (dest->ip6d_len + 1) << 3; 3117 if (len != destlen) 3118 return (EINVAL); 3119 /* 3120 * Determine the position that the destination options header 3121 * should be inserted; before or after the routing header. 3122 */ 3123 switch (optname) { 3124 case IPV6_2292DSTOPTS: 3125 /* 3126 * The old advanced API is ambiguous on this point. 3127 * Our approach is to determine the position based 3128 * according to the existence of a routing header. 3129 * Note, however, that this depends on the order of the 3130 * extension headers in the ancillary data; the 1st 3131 * part of the destination options header must appear 3132 * before the routing header in the ancillary data, 3133 * too. 3134 * RFC3542 solved the ambiguity by introducing 3135 * separate ancillary data or option types. 3136 */ 3137 if (opt->ip6po_rthdr == NULL) 3138 newdest = &opt->ip6po_dest1; 3139 else 3140 newdest = &opt->ip6po_dest2; 3141 break; 3142 case IPV6_RTHDRDSTOPTS: 3143 newdest = &opt->ip6po_dest1; 3144 break; 3145 case IPV6_DSTOPTS: 3146 newdest = &opt->ip6po_dest2; 3147 break; 3148 } 3149 3150 /* turn off the previous option, then set the new option. */ 3151 ip6_clearpktopts(opt, optname); 3152 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3153 if (*newdest == NULL) 3154 return (ENOBUFS); 3155 memcpy(*newdest, dest, destlen); 3156 3157 break; 3158 } 3159 3160 #ifdef RFC2292 3161 case IPV6_2292RTHDR: 3162 #endif 3163 case IPV6_RTHDR: 3164 { 3165 struct ip6_rthdr *rth; 3166 int rthlen; 3167 3168 if (len == 0) { 3169 ip6_clearpktopts(opt, IPV6_RTHDR); 3170 break; /* just remove the option */ 3171 } 3172 3173 /* message length validation */ 3174 if (len < sizeof(struct ip6_rthdr)) 3175 return (EINVAL); 3176 rth = (struct ip6_rthdr *)buf; 3177 rthlen = (rth->ip6r_len + 1) << 3; 3178 if (len != rthlen) 3179 return (EINVAL); 3180 switch (rth->ip6r_type) { 3181 case IPV6_RTHDR_TYPE_0: 3182 /* Dropped, RFC5095. */ 3183 default: 3184 return (EINVAL); /* not supported */ 3185 } 3186 /* turn off the previous option */ 3187 ip6_clearpktopts(opt, IPV6_RTHDR); 3188 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3189 if (opt->ip6po_rthdr == NULL) 3190 return (ENOBUFS); 3191 memcpy(opt->ip6po_rthdr, rth, rthlen); 3192 break; 3193 } 3194 3195 case IPV6_USE_MIN_MTU: 3196 if (len != sizeof(int)) 3197 return (EINVAL); 3198 minmtupolicy = *(int *)buf; 3199 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3200 minmtupolicy != IP6PO_MINMTU_DISABLE && 3201 minmtupolicy != IP6PO_MINMTU_ALL) { 3202 return (EINVAL); 3203 } 3204 opt->ip6po_minmtu = minmtupolicy; 3205 break; 3206 3207 case IPV6_DONTFRAG: 3208 if (len != sizeof(int)) 3209 return (EINVAL); 3210 3211 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3212 /* 3213 * we ignore this option for TCP sockets. 3214 * (RFC3542 leaves this case unspecified.) 3215 */ 3216 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3217 } else 3218 opt->ip6po_flags |= IP6PO_DONTFRAG; 3219 break; 3220 3221 case IPV6_PREFER_TEMPADDR: 3222 { 3223 int preftemp; 3224 3225 if (len != sizeof(int)) 3226 return (EINVAL); 3227 preftemp = *(int *)buf; 3228 switch (preftemp) { 3229 case IP6PO_TEMPADDR_SYSTEM: 3230 case IP6PO_TEMPADDR_NOTPREFER: 3231 case IP6PO_TEMPADDR_PREFER: 3232 break; 3233 default: 3234 return (EINVAL); 3235 } 3236 opt->ip6po_prefer_tempaddr = preftemp; 3237 break; 3238 } 3239 3240 default: 3241 return (ENOPROTOOPT); 3242 } /* end of switch */ 3243 3244 return (0); 3245 } 3246 3247 /* 3248 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3249 * packet to the input queue of a specified interface. Note that this 3250 * calls the output routine of the loopback "driver", but with an interface 3251 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3252 */ 3253 void 3254 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3255 const struct sockaddr_in6 *dst) 3256 { 3257 struct mbuf *copym; 3258 struct ip6_hdr *ip6; 3259 3260 copym = m_copypacket(m, M_DONTWAIT); 3261 if (copym == NULL) 3262 return; 3263 3264 /* 3265 * Make sure to deep-copy IPv6 header portion in case the data 3266 * is in an mbuf cluster, so that we can safely override the IPv6 3267 * header portion later. 3268 */ 3269 if ((copym->m_flags & M_EXT) != 0 || 3270 copym->m_len < sizeof(struct ip6_hdr)) { 3271 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3272 if (copym == NULL) 3273 return; 3274 } 3275 3276 #ifdef DIAGNOSTIC 3277 if (copym->m_len < sizeof(*ip6)) { 3278 m_freem(copym); 3279 return; 3280 } 3281 #endif 3282 3283 ip6 = mtod(copym, struct ip6_hdr *); 3284 /* 3285 * clear embedded scope identifiers if necessary. 3286 * in6_clearscope will touch the addresses only when necessary. 3287 */ 3288 in6_clearscope(&ip6->ip6_src); 3289 in6_clearscope(&ip6->ip6_dst); 3290 3291 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3292 } 3293 3294 /* 3295 * Chop IPv6 header off from the payload. 3296 */ 3297 static int 3298 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3299 { 3300 struct mbuf *mh; 3301 struct ip6_hdr *ip6; 3302 3303 ip6 = mtod(m, struct ip6_hdr *); 3304 if (m->m_len > sizeof(*ip6)) { 3305 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3306 if (mh == NULL) { 3307 m_freem(m); 3308 return ENOBUFS; 3309 } 3310 M_MOVE_PKTHDR(mh, m); 3311 MH_ALIGN(mh, sizeof(*ip6)); 3312 m->m_len -= sizeof(*ip6); 3313 m->m_data += sizeof(*ip6); 3314 mh->m_next = m; 3315 mh->m_len = sizeof(*ip6); 3316 memcpy(mtod(mh, void *), (void *)ip6, sizeof(*ip6)); 3317 m = mh; 3318 } 3319 exthdrs->ip6e_ip6 = m; 3320 return 0; 3321 } 3322 3323 /* 3324 * Compute IPv6 extension header length. 3325 */ 3326 int 3327 ip6_optlen(struct in6pcb *in6p) 3328 { 3329 int len; 3330 3331 if (!in6p->in6p_outputopts) 3332 return 0; 3333 3334 len = 0; 3335 #define elen(x) \ 3336 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3337 3338 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3339 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3340 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3341 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3342 return len; 3343 #undef elen 3344 } 3345 3346 /* 3347 * Ensure sending address is valid. 3348 * Returns 0 on success, -1 if an error should be sent back or 1 3349 * if the packet could be dropped without error (protocol dependent). 3350 */ 3351 static int 3352 ip6_ifaddrvalid(const struct in6_addr *src, const struct in6_addr *dst) 3353 { 3354 struct sockaddr_in6 sin6; 3355 int s, error; 3356 struct ifaddr *ifa; 3357 struct in6_ifaddr *ia6; 3358 3359 if (IN6_IS_ADDR_UNSPECIFIED(src)) 3360 return 0; 3361 3362 memset(&sin6, 0, sizeof(sin6)); 3363 sin6.sin6_family = AF_INET6; 3364 sin6.sin6_len = sizeof(sin6); 3365 sin6.sin6_addr = *src; 3366 3367 s = pserialize_read_enter(); 3368 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 3369 if ((ia6 = ifatoia6(ifa)) == NULL || 3370 ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_DUPLICATED)) 3371 error = -1; 3372 else if (ia6->ia6_flags & IN6_IFF_TENTATIVE) 3373 error = 1; 3374 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 3375 (sin6.sin6_addr = *dst, ifa_ifwithaddr(sin6tosa(&sin6)) == NULL)) 3376 /* Allow internal traffic to DETACHED addresses */ 3377 error = 1; 3378 else 3379 error = 0; 3380 pserialize_read_exit(s); 3381 3382 return error; 3383 } 3384
Indexes created Wed Oct 01 07:09:59 GMT 2025