1 /* $FreeBSD: src/sys/netinet6/ip6_output.c,v 1.13.2.18 2003/01/24 05:11:35 sam Exp $ */ 2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei 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 "opt_ip6fw.h" 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 68 #include <sys/param.h> 69 #include <sys/malloc.h> 70 #include <sys/mbuf.h> 71 #include <sys/errno.h> 72 #include <sys/protosw.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/systm.h> 76 #include <sys/kernel.h> 77 #include <sys/proc.h> 78 #include <sys/caps.h> 79 80 #include <sys/msgport2.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 #include <net/pfil.h> 85 86 #include <netinet/in.h> 87 #include <netinet/in_var.h> 88 #include <netinet6/in6_var.h> 89 #include <netinet/ip6.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet6/nd6.h> 94 #include <netinet6/ip6protosw.h> 95 96 #include <net/ip6fw/ip6_fw.h> 97 98 #include <net/net_osdep.h> 99 100 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 101 102 struct ip6_exthdrs { 103 struct mbuf *ip6e_ip6; 104 struct mbuf *ip6e_hbh; 105 struct mbuf *ip6e_dest1; 106 struct mbuf *ip6e_rthdr; 107 struct mbuf *ip6e_dest2; 108 }; 109 110 static int ip6_pcbopt (int, u_char *, int, struct ip6_pktopts **, int); 111 static int ip6_setpktoption (int, u_char *, int, struct ip6_pktopts *, 112 int, int, int, int); 113 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, struct socket *, 114 struct sockopt *); 115 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 116 static int ip6_setmoptions (int, struct ip6_moptions **, struct mbuf *); 117 static int ip6_getmoptions (int, struct ip6_moptions *, struct mbuf **); 118 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 119 struct ifnet *, struct in6_addr *, u_long *, int *); 120 static int copyexthdr (void *, struct mbuf **); 121 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 122 struct ip6_frag **); 123 static int ip6_insert_jumboopt (struct ip6_exthdrs *, u_int32_t); 124 static struct mbuf *ip6_splithdr (struct mbuf *); 125 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 126 127 /* 128 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 129 * header (with pri, len, nxt, hlim, src, dst). 130 * This function may modify ver and hlim only. 131 * The mbuf chain containing the packet will be freed. 132 * The mbuf opt, if present, will not be freed. 133 * 134 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 135 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 136 * which is rt_rmx.rmx_mtu. 137 */ 138 int 139 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, 140 int flags, struct ip6_moptions *im6o, 141 struct ifnet **ifpp, /* XXX: just for statistics */ 142 struct inpcb *inp) 143 { 144 struct ip6_hdr *ip6, *mhip6; 145 struct ifnet *ifp, *origifp; 146 struct mbuf *m = m0; 147 struct mbuf *mprev; 148 u_char *nexthdrp; 149 int hlen, tlen, len, off; 150 struct route_in6 ip6route; 151 struct sockaddr_in6 *dst; 152 int error = 0; 153 struct in6_ifaddr *ia = NULL; 154 u_long mtu; 155 int alwaysfrag, dontfrag; 156 u_int32_t optlen, plen = 0, unfragpartlen; 157 struct ip6_exthdrs exthdrs; 158 struct in6_addr finaldst; 159 struct route_in6 *ro_pmtu = NULL; 160 boolean_t hdrsplit = FALSE; 161 162 bzero(&exthdrs, sizeof exthdrs); 163 164 if (opt) { 165 if ((error = copyexthdr(opt->ip6po_hbh, &exthdrs.ip6e_hbh))) 166 goto freehdrs; 167 if ((error = copyexthdr(opt->ip6po_dest1, &exthdrs.ip6e_dest1))) 168 goto freehdrs; 169 if ((error = copyexthdr(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr))) 170 goto freehdrs; 171 if ((error = copyexthdr(opt->ip6po_dest2, &exthdrs.ip6e_dest2))) 172 goto freehdrs; 173 } 174 175 /* 176 * Calculate the total length of the extension header chain. 177 * Keep the length of the unfragmentable part for fragmentation. 178 */ 179 optlen = m_lengthm(exthdrs.ip6e_hbh, NULL) + 180 m_lengthm(exthdrs.ip6e_dest1, NULL) + 181 m_lengthm(exthdrs.ip6e_rthdr, NULL); 182 183 unfragpartlen = optlen + sizeof(struct ip6_hdr); 184 185 /* NOTE: we don't add AH/ESP length here. do that later. */ 186 optlen += m_lengthm(exthdrs.ip6e_dest2, NULL); 187 188 /* 189 * If there is at least one extension header, 190 * separate IP6 header from the payload. 191 */ 192 if (optlen && !hdrsplit) { 193 exthdrs.ip6e_ip6 = ip6_splithdr(m); 194 if (exthdrs.ip6e_ip6 == NULL) { 195 error = ENOBUFS; 196 goto freehdrs; 197 } 198 m = exthdrs.ip6e_ip6; 199 hdrsplit = TRUE; 200 } 201 202 /* adjust pointer */ 203 ip6 = mtod(m, struct ip6_hdr *); 204 205 /* adjust mbuf packet header length */ 206 m->m_pkthdr.len += optlen; 207 plen = m->m_pkthdr.len - sizeof(*ip6); 208 209 /* If this is a jumbo payload, insert a jumbo payload option. */ 210 if (plen > IPV6_MAXPACKET) { 211 if (!hdrsplit) { 212 exthdrs.ip6e_ip6 = ip6_splithdr(m); 213 if (exthdrs.ip6e_ip6 == NULL) { 214 error = ENOBUFS; 215 goto freehdrs; 216 } 217 m = exthdrs.ip6e_ip6; 218 hdrsplit = TRUE; 219 } 220 /* adjust pointer */ 221 ip6 = mtod(m, struct ip6_hdr *); 222 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 223 goto freehdrs; 224 ip6->ip6_plen = 0; 225 } else 226 ip6->ip6_plen = htons(plen); 227 228 /* 229 * Concatenate headers and fill in next header fields. 230 * Here we have, on "m" 231 * IPv6 payload 232 * and we insert headers accordingly. Finally, we should be getting: 233 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 234 * 235 * during the header composing process, "m" points to IPv6 header. 236 * "mprev" points to an extension header prior to esp. 237 */ 238 239 nexthdrp = &ip6->ip6_nxt; 240 mprev = m; 241 242 /* 243 * we treat dest2 specially. the goal here is to make mprev point the 244 * mbuf prior to dest2. 245 * 246 * result: IPv6 dest2 payload 247 * m and mprev will point to IPv6 header. 248 */ 249 if (exthdrs.ip6e_dest2) { 250 if (!hdrsplit) 251 panic("assumption failed: hdr not split"); 252 exthdrs.ip6e_dest2->m_next = m->m_next; 253 m->m_next = exthdrs.ip6e_dest2; 254 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 255 ip6->ip6_nxt = IPPROTO_DSTOPTS; 256 } 257 258 /* 259 * Place m1 after mprev. 260 */ 261 #define MAKE_CHAIN(m1, mprev, nexthdrp, i)\ 262 do {\ 263 if (m1) {\ 264 if (!hdrsplit)\ 265 panic("assumption failed: hdr not split");\ 266 *mtod(m1, u_char *) = *nexthdrp;\ 267 *nexthdrp = (i);\ 268 nexthdrp = mtod(m1, u_char *);\ 269 m1->m_next = mprev->m_next;\ 270 mprev->m_next = m1;\ 271 mprev = m1;\ 272 }\ 273 } while (0) 274 275 /* 276 * result: IPv6 hbh dest1 rthdr dest2 payload 277 * m will point to IPv6 header. mprev will point to the 278 * extension header prior to dest2 (rthdr in the above case). 279 */ 280 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 281 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); 282 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); 283 284 /* 285 * If there is a routing header, replace the destination address field 286 * with the first hop of the routing header. 287 */ 288 if (exthdrs.ip6e_rthdr) { 289 struct ip6_rthdr *rh; 290 291 finaldst = ip6->ip6_dst; 292 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 293 switch (rh->ip6r_type) { 294 default: /* is it possible? */ 295 error = EINVAL; 296 goto bad; 297 } 298 } 299 300 /* Source address validation */ 301 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 302 !(flags & IPV6_DADOUTPUT)) { 303 error = EOPNOTSUPP; 304 ip6stat.ip6s_badscope++; 305 goto bad; 306 } 307 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 308 error = EOPNOTSUPP; 309 ip6stat.ip6s_badscope++; 310 goto bad; 311 } 312 313 ip6stat.ip6s_localout++; 314 315 /* 316 * Route packet. 317 */ 318 if (ro == NULL) { 319 ro = &ip6route; 320 bzero(ro, sizeof(*ro)); 321 } 322 ro_pmtu = ro; 323 if (opt && opt->ip6po_rthdr) 324 ro = &opt->ip6po_route; 325 dst = (struct sockaddr_in6 *)&ro->ro_dst; 326 327 /* 328 * If there is a cached route, 329 * check that it is to the same destination 330 * and is still up. If not, free it and try again. 331 */ 332 if (ro->ro_rt != NULL && 333 (!(ro->ro_rt->rt_flags & RTF_UP) || dst->sin6_family != AF_INET6 || 334 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 335 RTFREE(ro->ro_rt); 336 ro->ro_rt = NULL; 337 } 338 if (ro->ro_rt == NULL) { 339 bzero(dst, sizeof(*dst)); 340 dst->sin6_family = AF_INET6; 341 dst->sin6_len = sizeof(struct sockaddr_in6); 342 dst->sin6_addr = ip6->ip6_dst; 343 } 344 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 345 /* Unicast */ 346 347 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 348 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 349 /* xxx 350 * interface selection comes here 351 * if an interface is specified from an upper layer, 352 * ifp must point it. 353 */ 354 if (ro->ro_rt == NULL) { 355 /* 356 * non-bsdi always clone routes, if parent is 357 * PRF_CLONING. 358 */ 359 rtalloc((struct route *)ro); 360 } 361 if (ro->ro_rt == NULL) { 362 ip6stat.ip6s_noroute++; 363 error = EHOSTUNREACH; 364 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 365 goto bad; 366 } 367 ia = ifatoia6(ro->ro_rt->rt_ifa); 368 ifp = ro->ro_rt->rt_ifp; 369 ro->ro_rt->rt_use++; 370 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 371 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 372 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 373 374 in6_ifstat_inc(ifp, ifs6_out_request); 375 376 /* 377 * Check if the outgoing interface conflicts with 378 * the interface specified by ifi6_ifindex (if specified). 379 * Note that loopback interface is always okay. 380 * (this may happen when we are sending a packet to one of 381 * our own addresses.) 382 */ 383 if (opt && opt->ip6po_pktinfo 384 && opt->ip6po_pktinfo->ipi6_ifindex) { 385 if (!(ifp->if_flags & IFF_LOOPBACK) 386 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 387 ip6stat.ip6s_noroute++; 388 in6_ifstat_inc(ifp, ifs6_out_discard); 389 error = EHOSTUNREACH; 390 goto bad; 391 } 392 } 393 394 if (opt && opt->ip6po_hlim != -1) 395 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 396 } else { 397 /* Multicast */ 398 struct in6_multi *in6m; 399 400 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 401 402 /* 403 * See if the caller provided any multicast options 404 */ 405 ifp = NULL; 406 if (im6o != NULL) { 407 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 408 if (im6o->im6o_multicast_ifp != NULL) 409 ifp = im6o->im6o_multicast_ifp; 410 } else 411 ip6->ip6_hlim = ip6_defmcasthlim; 412 413 /* 414 * See if the caller provided the outgoing interface 415 * as an ancillary data. 416 * Boundary check for ifindex is assumed to be already done. 417 */ 418 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 419 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 420 421 /* 422 * If the destination is a node-local scope multicast, 423 * the packet should be loop-backed only. 424 */ 425 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 426 /* 427 * If the outgoing interface is already specified, 428 * it should be a loopback interface. 429 */ 430 if (ifp && !(ifp->if_flags & IFF_LOOPBACK)) { 431 ip6stat.ip6s_badscope++; 432 error = ENETUNREACH; /* XXX: better error? */ 433 /* XXX correct ifp? */ 434 in6_ifstat_inc(ifp, ifs6_out_discard); 435 goto bad; 436 } else { 437 ifp = loif; 438 } 439 } 440 441 if (opt && opt->ip6po_hlim != -1) 442 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 443 444 /* 445 * If caller did not provide an interface lookup a 446 * default in the routing table. This is either a 447 * default for the speicfied group (i.e. a host 448 * route), or a multicast default (a route for the 449 * ``net'' ff00::/8). 450 */ 451 if (ifp == NULL) { 452 if (ro->ro_rt == NULL) { 453 ro->ro_rt = 454 rtpurelookup((struct sockaddr *)&ro->ro_dst); 455 } 456 if (ro->ro_rt == NULL) { 457 ip6stat.ip6s_noroute++; 458 error = EHOSTUNREACH; 459 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 460 goto bad; 461 } 462 ia = ifatoia6(ro->ro_rt->rt_ifa); 463 ifp = ro->ro_rt->rt_ifp; 464 ro->ro_rt->rt_use++; 465 } 466 467 if (!(flags & IPV6_FORWARDING)) 468 in6_ifstat_inc(ifp, ifs6_out_request); 469 in6_ifstat_inc(ifp, ifs6_out_mcast); 470 471 /* 472 * Confirm that the outgoing interface supports multicast. 473 */ 474 if (!(ifp->if_flags & IFF_MULTICAST)) { 475 ip6stat.ip6s_noroute++; 476 in6_ifstat_inc(ifp, ifs6_out_discard); 477 error = ENETUNREACH; 478 goto bad; 479 } 480 in6m = IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp); 481 if (in6m != NULL && 482 (im6o == NULL || im6o->im6o_multicast_loop)) { 483 /* 484 * If we belong to the destination multicast group 485 * on the outgoing interface, and the caller did not 486 * forbid loopback, loop back a copy. 487 */ 488 ip6_mloopback(ifp, m, dst); 489 } else { 490 /* 491 * If we are acting as a multicast router, perform 492 * multicast forwarding as if the packet had just 493 * arrived on the interface to which we are about 494 * to send. The multicast forwarding function 495 * recursively calls this function, using the 496 * IPV6_FORWARDING flag to prevent infinite recursion. 497 * 498 * Multicasts that are looped back by ip6_mloopback(), 499 * above, will be forwarded by the ip6_input() routine, 500 * if necessary. 501 */ 502 if (ip6_mrouter && !(flags & IPV6_FORWARDING)) { 503 if (ip6_mforward(ip6, ifp, m) != 0) { 504 m_freem(m); 505 goto done; 506 } 507 } 508 } 509 /* 510 * Multicasts with a hoplimit of zero may be looped back, 511 * above, but must not be transmitted on a network. 512 * Also, multicasts addressed to the loopback interface 513 * are not sent -- the above call to ip6_mloopback() will 514 * loop back a copy if this host actually belongs to the 515 * destination group on the loopback interface. 516 */ 517 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 518 m_freem(m); 519 goto done; 520 } 521 } 522 523 /* 524 * Fill the outgoing inteface to tell the upper layer 525 * to increment per-interface statistics. 526 */ 527 if (ifpp) 528 *ifpp = ifp; 529 530 /* Determine path MTU. */ 531 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 532 &alwaysfrag)) != 0) 533 goto bad; 534 535 /* 536 * The caller of this function may specify to use the minimum MTU 537 * in some cases. 538 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 539 * setting. The logic is a bit complicated; by default, unicast 540 * packets will follow path MTU while multicast packets will be sent at 541 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 542 * including unicast ones will be sent at the minimum MTU. Multicast 543 * packets will always be sent at the minimum MTU unless 544 * IP6PO_MINMTU_DISABLE is explicitly specified. 545 * See RFC 3542 for more details. 546 */ 547 if (mtu > IPV6_MMTU) { 548 if ((flags & IPV6_MINMTU)) 549 mtu = IPV6_MMTU; 550 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 551 mtu = IPV6_MMTU; 552 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 553 (opt == NULL || 554 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 555 mtu = IPV6_MMTU; 556 } 557 } 558 559 /* Fake scoped addresses */ 560 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 561 /* 562 * If source or destination address is a scoped address, and 563 * the packet is going to be sent to a loopback interface, 564 * we should keep the original interface. 565 */ 566 567 /* 568 * XXX: this is a very experimental and temporary solution. 569 * We eventually have sockaddr_in6 and use the sin6_scope_id 570 * field of the structure here. 571 * We rely on the consistency between two scope zone ids 572 * of source and destination, which should already be assured. 573 * Larger scopes than link will be supported in the future. 574 */ 575 origifp = NULL; 576 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 577 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 578 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 579 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 580 /* 581 * XXX: origifp can be NULL even in those two cases above. 582 * For example, if we remove the (only) link-local address 583 * from the loopback interface, and try to send a link-local 584 * address without link-id information. Then the source 585 * address is ::1, and the destination address is the 586 * link-local address with its s6_addr16[1] being zero. 587 * What is worse, if the packet goes to the loopback interface 588 * by a default rejected route, the null pointer would be 589 * passed to looutput, and the kernel would hang. 590 * The following last resort would prevent such disaster. 591 */ 592 if (origifp == NULL) 593 origifp = ifp; 594 } 595 else 596 origifp = ifp; 597 /* 598 * clear embedded scope identifiers if necessary. 599 * in6_clearscope will touch the addresses only when necessary. 600 */ 601 in6_clearscope(&ip6->ip6_src); 602 in6_clearscope(&ip6->ip6_dst); 603 604 /* 605 * Check with the firewall... 606 */ 607 if (ip6_fw_enable && ip6_fw_chk_ptr) { 608 u_short port = 0; 609 610 m->m_pkthdr.rcvif = NULL; /* XXX */ 611 /* If ipfw says divert, we have to just drop packet */ 612 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 613 m_freem(m); 614 goto done; 615 } 616 if (!m) { 617 error = EACCES; 618 goto done; 619 } 620 } 621 622 /* 623 * If the outgoing packet contains a hop-by-hop options header, 624 * it must be examined and processed even by the source node. 625 * (RFC 2460, section 4.) 626 */ 627 if (exthdrs.ip6e_hbh) { 628 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 629 u_int32_t dummy1; /* XXX unused */ 630 u_int32_t dummy2; /* XXX unused */ 631 632 #ifdef DIAGNOSTIC 633 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 634 panic("ip6e_hbh is not continuous"); 635 #endif 636 /* 637 * XXX: if we have to send an ICMPv6 error to the sender, 638 * we need the M_LOOP flag since icmp6_error() expects 639 * the IPv6 and the hop-by-hop options header are 640 * continuous unless the flag is set. 641 */ 642 m->m_flags |= M_LOOP; 643 m->m_pkthdr.rcvif = ifp; 644 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 645 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 646 &dummy1, &dummy2) < 0) { 647 /* m was already freed at this point */ 648 error = EINVAL;/* better error? */ 649 goto done; 650 } 651 m->m_flags &= ~M_LOOP; /* XXX */ 652 m->m_pkthdr.rcvif = NULL; 653 } 654 655 /* 656 * Run through list of hooks for output packets. 657 */ 658 if (pfil_has_hooks(&inet6_pfil_hook)) { 659 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT); 660 if (error != 0 || m == NULL) 661 goto done; 662 ip6 = mtod(m, struct ip6_hdr *); 663 } 664 665 /* 666 * Send the packet to the outgoing interface. 667 * If necessary, do IPv6 fragmentation before sending. 668 * 669 * the logic here is rather complex: 670 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 671 * 1-a: send as is if tlen <= path mtu 672 * 1-b: fragment if tlen > path mtu 673 * 674 * 2: if user asks us not to fragment (dontfrag == 1) 675 * 2-a: send as is if tlen <= interface mtu 676 * 2-b: error if tlen > interface mtu 677 * 678 * 3: if we always need to attach fragment header (alwaysfrag == 1) 679 * always fragment 680 * 681 * 4: if dontfrag == 1 && alwaysfrag == 1 682 * error, as we cannot handle this conflicting request 683 */ 684 tlen = m->m_pkthdr.len; 685 686 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 687 dontfrag = 1; 688 else 689 dontfrag = 0; 690 if (dontfrag && alwaysfrag) { /* case 4 */ 691 /* conflicting request - can't transmit */ 692 error = EMSGSIZE; 693 goto bad; 694 } 695 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 696 /* 697 * Even if the DONTFRAG option is specified, we cannot send the 698 * packet when the data length is larger than the MTU of the 699 * outgoing interface. 700 * Notify the error by sending IPV6_PATHMTU ancillary data as 701 * well as returning an error code (the latter is not described 702 * in the API spec.) 703 */ 704 u_int32_t mtu32; 705 struct ip6ctlparam ip6cp; 706 707 mtu32 = (u_int32_t)mtu; 708 bzero(&ip6cp, sizeof(ip6cp)); 709 ip6cp.ip6c_cmdarg = (void *)&mtu32; 710 kpfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 711 (void *)&ip6cp); 712 713 error = EMSGSIZE; 714 goto bad; 715 } 716 717 /* 718 * transmit packet without fragmentation 719 */ 720 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 721 struct in6_ifaddr *ia6; 722 723 ip6 = mtod(m, struct ip6_hdr *); 724 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 725 if (ia6) { 726 /* Record statistics for this interface address. */ 727 IFA_STAT_INC(&ia6->ia_ifa, opackets, 1); 728 IFA_STAT_INC(&ia6->ia_ifa, obytes, m->m_pkthdr.len); 729 } 730 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 731 goto done; 732 } 733 734 /* 735 * try to fragment the packet. case 1-b and 3 736 */ 737 if (mtu < IPV6_MMTU) { 738 /* 739 * note that path MTU is never less than IPV6_MMTU 740 * (see icmp6_input). 741 */ 742 error = EMSGSIZE; 743 in6_ifstat_inc(ifp, ifs6_out_fragfail); 744 goto bad; 745 } else if (ip6->ip6_plen == 0) { 746 /* jumbo payload cannot be fragmented */ 747 error = EMSGSIZE; 748 in6_ifstat_inc(ifp, ifs6_out_fragfail); 749 goto bad; 750 } else { 751 struct mbuf **mnext, *m_frgpart; 752 struct ip6_frag *ip6f; 753 u_int32_t id = htonl(ip6_id++); 754 u_char nextproto; 755 756 /* 757 * Too large for the destination or interface; 758 * fragment if possible. 759 * Must be able to put at least 8 bytes per fragment. 760 */ 761 hlen = unfragpartlen; 762 if (mtu > IPV6_MAXPACKET) 763 mtu = IPV6_MAXPACKET; 764 765 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 766 if (len < 8) { 767 error = EMSGSIZE; 768 in6_ifstat_inc(ifp, ifs6_out_fragfail); 769 goto bad; 770 } 771 772 mnext = &m->m_nextpkt; 773 774 /* 775 * Change the next header field of the last header in the 776 * unfragmentable part. 777 */ 778 if (exthdrs.ip6e_rthdr) { 779 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 780 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 781 } else if (exthdrs.ip6e_dest1) { 782 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 783 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 784 } else if (exthdrs.ip6e_hbh) { 785 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 786 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 787 } else { 788 nextproto = ip6->ip6_nxt; 789 ip6->ip6_nxt = IPPROTO_FRAGMENT; 790 } 791 792 /* 793 * Loop through length of segment after first fragment, 794 * make new header and copy data of each part and link onto 795 * chain. 796 */ 797 m0 = m; 798 for (off = hlen; off < tlen; off += len) { 799 MGETHDR(m, M_NOWAIT, MT_HEADER); 800 if (!m) { 801 error = ENOBUFS; 802 ip6stat.ip6s_odropped++; 803 goto sendorfree; 804 } 805 m->m_pkthdr.rcvif = NULL; 806 m->m_flags = m0->m_flags & M_COPYFLAGS; 807 *mnext = m; 808 mnext = &m->m_nextpkt; 809 m->m_data += max_linkhdr; 810 mhip6 = mtod(m, struct ip6_hdr *); 811 *mhip6 = *ip6; 812 m->m_len = sizeof(*mhip6); 813 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 814 if (error) { 815 ip6stat.ip6s_odropped++; 816 goto sendorfree; 817 } 818 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 819 if (off + len >= tlen) 820 len = tlen - off; 821 else 822 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 823 mhip6->ip6_plen = htons((u_short)(len + hlen + 824 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 825 m_frgpart = m_copym(m0, off, len, M_NOWAIT); 826 if (m_frgpart == NULL) { 827 error = ENOBUFS; 828 ip6stat.ip6s_odropped++; 829 goto sendorfree; 830 } 831 m_cat(m, m_frgpart); 832 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 833 m->m_pkthdr.rcvif = NULL; 834 ip6f->ip6f_reserved = 0; 835 ip6f->ip6f_ident = id; 836 ip6f->ip6f_nxt = nextproto; 837 ip6stat.ip6s_ofragments++; 838 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 839 } 840 841 in6_ifstat_inc(ifp, ifs6_out_fragok); 842 } 843 844 /* 845 * Remove leading garbages. 846 */ 847 sendorfree: 848 m = m0->m_nextpkt; 849 m0->m_nextpkt = NULL; 850 m_freem(m0); 851 for (m0 = m; m; m = m0) { 852 m0 = m->m_nextpkt; 853 m->m_nextpkt = NULL; 854 if (error == 0) { 855 /* Record statistics for this interface address. */ 856 if (ia) { 857 IFA_STAT_INC(&ia->ia_ifa, opackets, 1); 858 IFA_STAT_INC(&ia->ia_ifa, obytes, 859 m->m_pkthdr.len); 860 } 861 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 862 } else 863 m_freem(m); 864 } 865 866 if (error == 0) 867 ip6stat.ip6s_fragmented++; 868 869 done: 870 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 871 RTFREE(ro->ro_rt); 872 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 873 RTFREE(ro_pmtu->ro_rt); 874 } 875 876 return (error); 877 878 freehdrs: 879 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 880 m_freem(exthdrs.ip6e_dest1); 881 m_freem(exthdrs.ip6e_rthdr); 882 m_freem(exthdrs.ip6e_dest2); 883 /* FALLTHROUGH */ 884 bad: 885 m_freem(m); 886 goto done; 887 } 888 889 static int 890 copyexthdr(void *h, struct mbuf **mp) 891 { 892 struct ip6_ext *hdr = h; 893 int hlen; 894 struct mbuf *m; 895 896 if (hdr == NULL) 897 return 0; 898 899 hlen = (hdr->ip6e_len + 1) * 8; 900 if (hlen > MCLBYTES) 901 return ENOBUFS; /* XXX */ 902 903 m = m_getb(hlen, M_NOWAIT, MT_DATA, 0); 904 if (!m) 905 return ENOBUFS; 906 m->m_len = hlen; 907 908 bcopy(hdr, mtod(m, caddr_t), hlen); 909 910 *mp = m; 911 return 0; 912 } 913 914 /* 915 * Insert jumbo payload option. 916 */ 917 static int 918 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 919 { 920 struct mbuf *mopt; 921 u_char *optbuf; 922 u_int32_t v; 923 924 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 925 926 /* 927 * If there is no hop-by-hop options header, allocate new one. 928 * If there is one but it doesn't have enough space to store the 929 * jumbo payload option, allocate a cluster to store the whole options. 930 * Otherwise, use it to store the options. 931 */ 932 if (exthdrs->ip6e_hbh == NULL) { 933 MGET(mopt, M_NOWAIT, MT_DATA); 934 if (mopt == NULL) 935 return (ENOBUFS); 936 mopt->m_len = JUMBOOPTLEN; 937 optbuf = mtod(mopt, u_char *); 938 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 939 exthdrs->ip6e_hbh = mopt; 940 } else { 941 struct ip6_hbh *hbh; 942 943 mopt = exthdrs->ip6e_hbh; 944 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 945 /* 946 * XXX assumption: 947 * - exthdrs->ip6e_hbh is not referenced from places 948 * other than exthdrs. 949 * - exthdrs->ip6e_hbh is not an mbuf chain. 950 */ 951 int oldoptlen = mopt->m_len; 952 struct mbuf *n; 953 954 /* 955 * XXX: give up if the whole (new) hbh header does 956 * not fit even in an mbuf cluster. 957 */ 958 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 959 return (ENOBUFS); 960 961 /* 962 * As a consequence, we must always prepare a cluster 963 * at this point. 964 */ 965 n = m_getcl(M_NOWAIT, MT_DATA, 0); 966 if (!n) 967 return (ENOBUFS); 968 n->m_len = oldoptlen + JUMBOOPTLEN; 969 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); 970 optbuf = mtod(n, caddr_t) + oldoptlen; 971 m_freem(mopt); 972 mopt = exthdrs->ip6e_hbh = n; 973 } else { 974 optbuf = mtod(mopt, u_char *) + mopt->m_len; 975 mopt->m_len += JUMBOOPTLEN; 976 } 977 optbuf[0] = IP6OPT_PADN; 978 optbuf[1] = 1; 979 980 /* 981 * Adjust the header length according to the pad and 982 * the jumbo payload option. 983 */ 984 hbh = mtod(mopt, struct ip6_hbh *); 985 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 986 } 987 988 /* fill in the option. */ 989 optbuf[2] = IP6OPT_JUMBO; 990 optbuf[3] = 4; 991 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 992 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 993 994 /* finally, adjust the packet header length */ 995 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 996 997 return (0); 998 #undef JUMBOOPTLEN 999 } 1000 1001 /* 1002 * Insert fragment header and copy unfragmentable header portions. 1003 */ 1004 static int 1005 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1006 struct ip6_frag **frghdrp) 1007 { 1008 struct mbuf *n, *mlast; 1009 1010 if (hlen > sizeof(struct ip6_hdr)) { 1011 n = m_copym(m0, sizeof(struct ip6_hdr), 1012 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1013 if (n == NULL) 1014 return (ENOBUFS); 1015 m->m_next = n; 1016 } else 1017 n = m; 1018 1019 /* Search for the last mbuf of unfragmentable part. */ 1020 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1021 ; 1022 1023 if (!(mlast->m_flags & M_EXT) && 1024 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1025 /* use the trailing space of the last mbuf for the fragment hdr */ 1026 *frghdrp = (struct ip6_frag *) 1027 (mtod(mlast, caddr_t) + mlast->m_len); 1028 mlast->m_len += sizeof(struct ip6_frag); 1029 m->m_pkthdr.len += sizeof(struct ip6_frag); 1030 } else { 1031 /* allocate a new mbuf for the fragment header */ 1032 struct mbuf *mfrg; 1033 1034 MGET(mfrg, M_NOWAIT, MT_DATA); 1035 if (mfrg == NULL) 1036 return (ENOBUFS); 1037 mfrg->m_len = sizeof(struct ip6_frag); 1038 *frghdrp = mtod(mfrg, struct ip6_frag *); 1039 mlast->m_next = mfrg; 1040 } 1041 1042 return (0); 1043 } 1044 1045 static int 1046 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1047 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1048 int *alwaysfragp) 1049 { 1050 u_int32_t mtu = 0; 1051 int alwaysfrag = 0; 1052 int error = 0; 1053 1054 if (ro_pmtu != ro) { 1055 /* The first hop and the final destination may differ. */ 1056 struct sockaddr_in6 *sa6_dst = 1057 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1058 if (ro_pmtu->ro_rt && 1059 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1060 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1061 RTFREE(ro_pmtu->ro_rt); 1062 ro_pmtu->ro_rt = NULL; 1063 } 1064 if (ro_pmtu->ro_rt == NULL) { 1065 bzero(sa6_dst, sizeof(*sa6_dst)); 1066 sa6_dst->sin6_family = AF_INET6; 1067 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1068 sa6_dst->sin6_addr = *dst; 1069 1070 rtalloc((struct route *)ro_pmtu); 1071 } 1072 } 1073 if (ro_pmtu->ro_rt) { 1074 u_int32_t ifmtu; 1075 1076 if (ifp == NULL) 1077 ifp = ro_pmtu->ro_rt->rt_ifp; 1078 ifmtu = IN6_LINKMTU(ifp); 1079 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1080 if (mtu == 0) { 1081 mtu = ifmtu; 1082 } else if (mtu < IPV6_MMTU) { 1083 /* 1084 * RFC2460 section 5, last paragraph: 1085 * if we record ICMPv6 too big message with 1086 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1087 * or smaller, with framgent header attached. 1088 * (fragment header is needed regardless from the 1089 * packet size, for translators to identify packets) 1090 */ 1091 alwaysfrag = 1; 1092 mtu = IPV6_MMTU; 1093 } else if (mtu > ifmtu) { 1094 /* 1095 * The MTU on the route is larger than the MTU on 1096 * the interface! This shouldn't happen, unless the 1097 * MTU of the interface has been changed after the 1098 * interface was brought up. Change the MTU in the 1099 * route to match the interface MTU (as long as the 1100 * field isn't locked). 1101 */ 1102 mtu = ifmtu; 1103 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1104 } 1105 } else if (ifp) { 1106 mtu = IN6_LINKMTU(ifp); 1107 } else { 1108 error = EHOSTUNREACH; /* XXX */ 1109 } 1110 1111 *mtup = mtu; 1112 if (alwaysfragp) 1113 *alwaysfragp = alwaysfrag; 1114 return (error); 1115 } 1116 1117 /* 1118 * IP6 socket option processing. 1119 */ 1120 void 1121 ip6_ctloutput_dispatch(netmsg_t msg) 1122 { 1123 int error; 1124 1125 error = ip6_ctloutput(msg->ctloutput.base.nm_so, 1126 msg->ctloutput.nm_sopt); 1127 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 1128 } 1129 1130 int 1131 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1132 { 1133 int optdatalen,uproto; 1134 int privileged; 1135 struct inpcb *in6p = so->so_pcb; 1136 void *optdata; 1137 int error, optval; 1138 int level, op, optname; 1139 int optlen; 1140 struct thread *td; 1141 1142 if (sopt) { 1143 level = sopt->sopt_level; 1144 op = sopt->sopt_dir; 1145 optname = sopt->sopt_name; 1146 optlen = sopt->sopt_valsize; 1147 td = sopt->sopt_td; 1148 } else { 1149 panic("ip6_ctloutput: arg soopt is NULL"); 1150 /* NOT REACHED */ 1151 td = NULL; 1152 } 1153 error = optval = 0; 1154 1155 uproto = (int)so->so_proto->pr_protocol; 1156 privileged = (td == NULL || 1157 caps_priv_check_td(td, SYSCAP_RESTRICTEDROOT)) ? 1158 0 : 1; 1159 1160 if (level == IPPROTO_IPV6) { 1161 switch (op) { 1162 1163 case SOPT_SET: 1164 switch (optname) { 1165 case IPV6_2292PKTOPTIONS: 1166 #ifdef IPV6_PKTOPTIONS 1167 case IPV6_PKTOPTIONS: 1168 #endif 1169 { 1170 struct mbuf *m; 1171 1172 error = soopt_getm(sopt, &m); /* XXX */ 1173 if (error != 0) 1174 break; 1175 soopt_to_mbuf(sopt, m); /* XXX */ 1176 error = ip6_pcbopts(&in6p->in6p_outputopts, 1177 m, so, sopt); 1178 m_freem(m); /* XXX */ 1179 break; 1180 } 1181 1182 /* 1183 * Use of some Hop-by-Hop options or some 1184 * Destination options, might require special 1185 * privilege. That is, normal applications 1186 * (without special privilege) might be forbidden 1187 * from setting certain options in outgoing packets, 1188 * and might never see certain options in received 1189 * packets. [RFC 2292 Section 6] 1190 * KAME specific note: 1191 * KAME prevents non-privileged users from sending or 1192 * receiving ANY hbh/dst options in order to avoid 1193 * overhead of parsing options in the kernel. 1194 */ 1195 case IPV6_RECVHOPOPTS: 1196 case IPV6_RECVDSTOPTS: 1197 case IPV6_RECVRTHDRDSTOPTS: 1198 if (!privileged) 1199 return (EPERM); 1200 case IPV6_RECVPKTINFO: 1201 case IPV6_RECVHOPLIMIT: 1202 case IPV6_RECVRTHDR: 1203 case IPV6_RECVPATHMTU: 1204 case IPV6_RECVTCLASS: 1205 case IPV6_AUTOFLOWLABEL: 1206 case IPV6_HOPLIMIT: 1207 /* FALLTHROUGH */ 1208 case IPV6_UNICAST_HOPS: 1209 1210 case IPV6_V6ONLY: 1211 if (optlen != sizeof(int)) { 1212 error = EINVAL; 1213 break; 1214 } 1215 error = soopt_to_kbuf(sopt, &optval, 1216 sizeof optval, sizeof optval); 1217 if (error) 1218 break; 1219 switch (optname) { 1220 1221 case IPV6_UNICAST_HOPS: 1222 if (optval < -1 || optval >= 256) 1223 error = EINVAL; 1224 else { 1225 /* -1 = kernel default */ 1226 in6p->in6p_hops = optval; 1227 } 1228 break; 1229 #define OPTSET(bit) \ 1230 do { \ 1231 if (optval) \ 1232 in6p->in6p_flags |= (bit); \ 1233 else \ 1234 in6p->in6p_flags &= ~(bit); \ 1235 } while (0) 1236 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1237 /* 1238 * Although changed to RFC3542, It's better to also support RFC2292 API 1239 */ 1240 #define OPTSET2292(bit) \ 1241 do { \ 1242 in6p->in6p_flags |= IN6P_RFC2292; \ 1243 if (optval) \ 1244 in6p->in6p_flags |= (bit); \ 1245 else \ 1246 in6p->in6p_flags &= ~(bit); \ 1247 } while (/*CONSTCOND*/ 0) 1248 1249 case IPV6_RECVPKTINFO: 1250 /* cannot mix with RFC2292 */ 1251 if (OPTBIT(IN6P_RFC2292)) { 1252 error = EINVAL; 1253 break; 1254 } 1255 OPTSET(IN6P_PKTINFO); 1256 break; 1257 1258 case IPV6_HOPLIMIT: 1259 { 1260 struct ip6_pktopts **optp; 1261 1262 /* cannot mix with RFC2292 */ 1263 if (OPTBIT(IN6P_RFC2292)) { 1264 error = EINVAL; 1265 break; 1266 } 1267 optp = &in6p->in6p_outputopts; 1268 error = ip6_pcbopt(IPV6_HOPLIMIT, 1269 (u_char *)&optval, sizeof(optval), 1270 optp, uproto); 1271 break; 1272 } 1273 1274 case IPV6_RECVHOPLIMIT: 1275 /* cannot mix with RFC2292 */ 1276 if (OPTBIT(IN6P_RFC2292)) { 1277 error = EINVAL; 1278 break; 1279 } 1280 OPTSET(IN6P_HOPLIMIT); 1281 break; 1282 1283 case IPV6_RECVHOPOPTS: 1284 /* cannot mix with RFC2292 */ 1285 if (OPTBIT(IN6P_RFC2292)) { 1286 error = EINVAL; 1287 break; 1288 } 1289 OPTSET(IN6P_HOPOPTS); 1290 break; 1291 1292 case IPV6_RECVDSTOPTS: 1293 /* cannot mix with RFC2292 */ 1294 if (OPTBIT(IN6P_RFC2292)) { 1295 error = EINVAL; 1296 break; 1297 } 1298 OPTSET(IN6P_DSTOPTS); 1299 break; 1300 1301 case IPV6_RECVRTHDRDSTOPTS: 1302 /* cannot mix with RFC2292 */ 1303 if (OPTBIT(IN6P_RFC2292)) { 1304 error = EINVAL; 1305 break; 1306 } 1307 OPTSET(IN6P_RTHDRDSTOPTS); 1308 break; 1309 1310 case IPV6_RECVRTHDR: 1311 /* cannot mix with RFC2292 */ 1312 if (OPTBIT(IN6P_RFC2292)) { 1313 error = EINVAL; 1314 break; 1315 } 1316 OPTSET(IN6P_RTHDR); 1317 break; 1318 1319 case IPV6_RECVPATHMTU: 1320 /* 1321 * We ignore this option for TCP 1322 * sockets. 1323 * (RFC3542 leaves this case 1324 * unspecified.) 1325 */ 1326 if (uproto != IPPROTO_TCP) 1327 OPTSET(IN6P_MTU); 1328 break; 1329 1330 case IPV6_RECVTCLASS: 1331 /* cannot mix with RFC2292 XXX */ 1332 if (OPTBIT(IN6P_RFC2292)) { 1333 error = EINVAL; 1334 break; 1335 } 1336 OPTSET(IN6P_TCLASS); 1337 break; 1338 1339 case IPV6_AUTOFLOWLABEL: 1340 OPTSET(IN6P_AUTOFLOWLABEL); 1341 break; 1342 1343 case IPV6_V6ONLY: 1344 /* 1345 * make setsockopt(IPV6_V6ONLY) 1346 * available only prior to bind(2). 1347 */ 1348 if (in6p->in6p_lport || 1349 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1350 { 1351 error = EINVAL; 1352 break; 1353 } 1354 1355 /* 1356 * Since we don't support v6->v4 1357 * mapping any more this option does 1358 * nothing. But apparently some 1359 * ports and libraries (e.g. libuv) 1360 * actually try to set the value to 1361 * 0 so just silently ignore the value 1362 * entirely. 1363 * 1364 * (also fixes named which uses libuv, 1365 * and a few other apps) 1366 */ 1367 #if 0 1368 if (!optval) { 1369 /* Don't allow v4-mapped */ 1370 error = EOPNOTSUPP; 1371 } 1372 #endif 1373 break; 1374 } 1375 break; 1376 1377 case IPV6_TCLASS: 1378 case IPV6_DONTFRAG: 1379 case IPV6_USE_MIN_MTU: 1380 case IPV6_PREFER_TEMPADDR: 1381 if (optlen != sizeof(optval)) { 1382 error = EINVAL; 1383 break; 1384 } 1385 error = soopt_to_kbuf(sopt, &optval, 1386 sizeof optval, sizeof optval); 1387 if (error) 1388 break; 1389 { 1390 struct ip6_pktopts **optp; 1391 optp = &in6p->in6p_outputopts; 1392 error = ip6_pcbopt(optname, 1393 (u_char *)&optval, sizeof(optval), 1394 optp, uproto); 1395 break; 1396 } 1397 1398 case IPV6_2292PKTINFO: 1399 case IPV6_2292HOPLIMIT: 1400 case IPV6_2292HOPOPTS: 1401 case IPV6_2292DSTOPTS: 1402 case IPV6_2292RTHDR: 1403 /* RFC 2292 */ 1404 if (optlen != sizeof(int)) { 1405 error = EINVAL; 1406 break; 1407 } 1408 error = soopt_to_kbuf(sopt, &optval, 1409 sizeof optval, sizeof optval); 1410 if (error) 1411 break; 1412 switch (optname) { 1413 case IPV6_2292PKTINFO: 1414 OPTSET2292(IN6P_PKTINFO); 1415 break; 1416 case IPV6_2292HOPLIMIT: 1417 OPTSET2292(IN6P_HOPLIMIT); 1418 break; 1419 case IPV6_2292HOPOPTS: 1420 /* 1421 * Check super-user privilege. 1422 * See comments for IPV6_RECVHOPOPTS. 1423 */ 1424 if (!privileged) 1425 return (EPERM); 1426 OPTSET2292(IN6P_HOPOPTS); 1427 break; 1428 case IPV6_2292DSTOPTS: 1429 if (!privileged) 1430 return (EPERM); 1431 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1432 break; 1433 case IPV6_2292RTHDR: 1434 OPTSET2292(IN6P_RTHDR); 1435 break; 1436 } 1437 break; 1438 1439 case IPV6_PKTINFO: 1440 case IPV6_HOPOPTS: 1441 case IPV6_RTHDR: 1442 case IPV6_DSTOPTS: 1443 case IPV6_RTHDRDSTOPTS: 1444 case IPV6_NEXTHOP: 1445 { 1446 /* 1447 * New advanced API (RFC3542) 1448 */ 1449 u_char *optbuf; 1450 u_char optbuf_storage[MCLBYTES]; 1451 int optlen; 1452 struct ip6_pktopts **optp; 1453 1454 /* cannot mix with RFC2292 */ 1455 if (OPTBIT(IN6P_RFC2292)) { 1456 error = EINVAL; 1457 break; 1458 } 1459 1460 /* 1461 * We only ensure valsize is not too large 1462 * here. Further validation will be done 1463 * later. 1464 */ 1465 error = soopt_to_kbuf(sopt, optbuf_storage, 1466 sizeof(optbuf_storage), 0); 1467 if (error) 1468 break; 1469 optlen = sopt->sopt_valsize; 1470 optbuf = optbuf_storage; 1471 optp = &in6p->in6p_outputopts; 1472 error = ip6_pcbopt(optname, optbuf, optlen, 1473 optp, uproto); 1474 break; 1475 } 1476 #undef OPTSET 1477 1478 case IPV6_MULTICAST_IF: 1479 case IPV6_MULTICAST_HOPS: 1480 case IPV6_MULTICAST_LOOP: 1481 case IPV6_JOIN_GROUP: 1482 case IPV6_LEAVE_GROUP: 1483 { 1484 struct mbuf *m; 1485 1486 if (sopt->sopt_valsize > MLEN) { 1487 error = EMSGSIZE; 1488 break; 1489 } 1490 /* XXX */ 1491 MGET(m, sopt->sopt_td ? M_WAITOK : M_NOWAIT, MT_HEADER); 1492 if (m == NULL) { 1493 error = ENOBUFS; 1494 break; 1495 } 1496 m->m_len = sopt->sopt_valsize; 1497 error = soopt_to_kbuf(sopt, mtod(m, char *), 1498 m->m_len, m->m_len); 1499 error = ip6_setmoptions(sopt->sopt_name, 1500 &in6p->in6p_moptions, 1501 m); 1502 m_free(m); 1503 } 1504 break; 1505 1506 case IPV6_PORTRANGE: 1507 error = soopt_to_kbuf(sopt, &optval, 1508 sizeof optval, sizeof optval); 1509 if (error) 1510 break; 1511 1512 switch (optval) { 1513 case IPV6_PORTRANGE_DEFAULT: 1514 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1515 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1516 break; 1517 1518 case IPV6_PORTRANGE_HIGH: 1519 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1520 in6p->in6p_flags |= IN6P_HIGHPORT; 1521 break; 1522 1523 case IPV6_PORTRANGE_LOW: 1524 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1525 in6p->in6p_flags |= IN6P_LOWPORT; 1526 break; 1527 1528 default: 1529 error = EINVAL; 1530 break; 1531 } 1532 break; 1533 1534 case IPV6_FW_ADD: 1535 case IPV6_FW_DEL: 1536 case IPV6_FW_FLUSH: 1537 case IPV6_FW_ZERO: 1538 { 1539 struct mbuf *m; 1540 struct mbuf **mp = &m; 1541 1542 if (ip6_fw_ctl_ptr == NULL) 1543 return EINVAL; 1544 /* XXX */ 1545 if ((error = soopt_getm(sopt, &m)) != 0) 1546 break; 1547 /* XXX */ 1548 soopt_to_mbuf(sopt, m); 1549 error = (*ip6_fw_ctl_ptr)(optname, mp); 1550 m = *mp; 1551 } 1552 break; 1553 1554 default: 1555 error = ENOPROTOOPT; 1556 break; 1557 } 1558 break; 1559 1560 case SOPT_GET: 1561 switch (optname) { 1562 case IPV6_2292PKTOPTIONS: 1563 #ifdef IPV6_PKTOPTIONS 1564 case IPV6_PKTOPTIONS: 1565 #endif 1566 /* 1567 * RFC3542 (effectively) deprecated the 1568 * semantics of the 2292-style pktoptions. 1569 * Since it was not reliable in nature (i.e., 1570 * applications had to expect the lack of some 1571 * information after all), it would make sense 1572 * to simplify this part by always returning 1573 * empty data. 1574 */ 1575 if (in6p->in6p_options) { 1576 struct mbuf *m; 1577 m = m_copym(in6p->in6p_options, 1578 0, M_COPYALL, M_WAITOK); 1579 error = soopt_from_mbuf(sopt, m); 1580 if (error == 0) 1581 m_freem(m); 1582 } else 1583 sopt->sopt_valsize = 0; 1584 break; 1585 1586 case IPV6_RECVHOPOPTS: 1587 case IPV6_RECVDSTOPTS: 1588 case IPV6_RECVRTHDRDSTOPTS: 1589 case IPV6_UNICAST_HOPS: 1590 case IPV6_RECVPKTINFO: 1591 case IPV6_RECVHOPLIMIT: 1592 case IPV6_RECVRTHDR: 1593 case IPV6_RECVPATHMTU: 1594 case IPV6_RECVTCLASS: 1595 case IPV6_AUTOFLOWLABEL: 1596 case IPV6_V6ONLY: 1597 case IPV6_PORTRANGE: 1598 switch (optname) { 1599 1600 case IPV6_RECVHOPOPTS: 1601 optval = OPTBIT(IN6P_HOPOPTS); 1602 break; 1603 1604 case IPV6_RECVDSTOPTS: 1605 optval = OPTBIT(IN6P_DSTOPTS); 1606 break; 1607 1608 case IPV6_RECVRTHDRDSTOPTS: 1609 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1610 break; 1611 1612 case IPV6_RECVPKTINFO: 1613 optval = OPTBIT(IN6P_PKTINFO); 1614 break; 1615 1616 case IPV6_RECVHOPLIMIT: 1617 optval = OPTBIT(IN6P_HOPLIMIT); 1618 break; 1619 1620 case IPV6_RECVRTHDR: 1621 optval = OPTBIT(IN6P_RTHDR); 1622 break; 1623 1624 case IPV6_RECVPATHMTU: 1625 optval = OPTBIT(IN6P_MTU); 1626 break; 1627 1628 case IPV6_RECVTCLASS: 1629 optval = OPTBIT(IN6P_TCLASS); 1630 break; 1631 1632 case IPV6_AUTOFLOWLABEL: 1633 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1634 break; 1635 1636 1637 case IPV6_UNICAST_HOPS: 1638 optval = in6p->in6p_hops; 1639 break; 1640 1641 case IPV6_V6ONLY: 1642 optval = 1; 1643 break; 1644 1645 case IPV6_PORTRANGE: 1646 { 1647 int flags; 1648 flags = in6p->in6p_flags; 1649 if (flags & IN6P_HIGHPORT) 1650 optval = IPV6_PORTRANGE_HIGH; 1651 else if (flags & IN6P_LOWPORT) 1652 optval = IPV6_PORTRANGE_LOW; 1653 else 1654 optval = 0; 1655 break; 1656 } 1657 } 1658 soopt_from_kbuf(sopt, &optval, 1659 sizeof optval); 1660 break; 1661 1662 case IPV6_PATHMTU: 1663 { 1664 u_long pmtu = 0; 1665 struct ip6_mtuinfo mtuinfo; 1666 struct route_in6 sro; 1667 1668 bzero(&sro, sizeof(sro)); 1669 1670 if (!(so->so_state & SS_ISCONNECTED)) 1671 return (ENOTCONN); 1672 /* 1673 * XXX: we dot not consider the case of source 1674 * routing, or optional information to specify 1675 * the outgoing interface. 1676 */ 1677 error = ip6_getpmtu(&sro, NULL, NULL, 1678 &in6p->in6p_faddr, &pmtu, NULL); 1679 if (sro.ro_rt) 1680 RTFREE(sro.ro_rt); 1681 if (error) 1682 break; 1683 if (pmtu > IPV6_MAXPACKET) 1684 pmtu = IPV6_MAXPACKET; 1685 1686 bzero(&mtuinfo, sizeof(mtuinfo)); 1687 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1688 optdata = (void *)&mtuinfo; 1689 optdatalen = sizeof(mtuinfo); 1690 soopt_from_kbuf(sopt, optdata, 1691 optdatalen); 1692 break; 1693 } 1694 1695 case IPV6_2292PKTINFO: 1696 case IPV6_2292HOPLIMIT: 1697 case IPV6_2292HOPOPTS: 1698 case IPV6_2292RTHDR: 1699 case IPV6_2292DSTOPTS: 1700 if (optname == IPV6_2292HOPOPTS || 1701 optname == IPV6_2292DSTOPTS || 1702 !privileged) 1703 return (EPERM); 1704 switch (optname) { 1705 case IPV6_2292PKTINFO: 1706 optval = OPTBIT(IN6P_PKTINFO); 1707 break; 1708 case IPV6_2292HOPLIMIT: 1709 optval = OPTBIT(IN6P_HOPLIMIT); 1710 break; 1711 case IPV6_2292HOPOPTS: 1712 if (!privileged) 1713 return (EPERM); 1714 optval = OPTBIT(IN6P_HOPOPTS); 1715 break; 1716 case IPV6_2292RTHDR: 1717 optval = OPTBIT(IN6P_RTHDR); 1718 break; 1719 case IPV6_2292DSTOPTS: 1720 if (!privileged) 1721 return (EPERM); 1722 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1723 break; 1724 } 1725 soopt_from_kbuf(sopt, &optval, 1726 sizeof optval); 1727 break; 1728 1729 case IPV6_PKTINFO: 1730 case IPV6_HOPOPTS: 1731 case IPV6_RTHDR: 1732 case IPV6_DSTOPTS: 1733 case IPV6_RTHDRDSTOPTS: 1734 case IPV6_NEXTHOP: 1735 case IPV6_TCLASS: 1736 case IPV6_DONTFRAG: 1737 case IPV6_USE_MIN_MTU: 1738 case IPV6_PREFER_TEMPADDR: 1739 error = ip6_getpcbopt(in6p->in6p_outputopts, 1740 optname, sopt); 1741 break; 1742 1743 case IPV6_MULTICAST_IF: 1744 case IPV6_MULTICAST_HOPS: 1745 case IPV6_MULTICAST_LOOP: 1746 case IPV6_JOIN_GROUP: 1747 case IPV6_LEAVE_GROUP: 1748 { 1749 struct mbuf *m; 1750 error = ip6_getmoptions(sopt->sopt_name, 1751 in6p->in6p_moptions, &m); 1752 if (error == 0) { 1753 soopt_from_kbuf(sopt, 1754 mtod(m, char *), m->m_len); 1755 } 1756 m_freem(m); 1757 } 1758 break; 1759 1760 case IPV6_FW_GET: 1761 { 1762 struct mbuf *m; 1763 struct mbuf **mp = &m; 1764 1765 if (ip6_fw_ctl_ptr == NULL) 1766 { 1767 return EINVAL; 1768 } 1769 error = (*ip6_fw_ctl_ptr)(optname, mp); 1770 if (error == 0) 1771 error = soopt_from_mbuf(sopt, m); /* XXX */ 1772 if (error == 0 && m != NULL) 1773 m_freem(m); 1774 } 1775 break; 1776 1777 default: 1778 error = ENOPROTOOPT; 1779 break; 1780 } 1781 break; 1782 } 1783 } else { 1784 error = EINVAL; 1785 } 1786 return (error); 1787 } 1788 1789 int 1790 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1791 { 1792 int error = 0, optval, optlen; 1793 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1794 struct in6pcb *in6p = sotoin6pcb(so); 1795 int level, op, optname; 1796 1797 if (sopt) { 1798 level = sopt->sopt_level; 1799 op = sopt->sopt_dir; 1800 optname = sopt->sopt_name; 1801 optlen = sopt->sopt_valsize; 1802 } else 1803 panic("ip6_raw_ctloutput: arg soopt is NULL"); 1804 1805 if (level != IPPROTO_IPV6) { 1806 return (EINVAL); 1807 } 1808 1809 switch (optname) { 1810 case IPV6_CHECKSUM: 1811 /* 1812 * For ICMPv6 sockets, no modification allowed for checksum 1813 * offset, permit "no change" values to help existing apps. 1814 * 1815 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 1816 * for an ICMPv6 socket will fail." 1817 * The current behavior does not meet RFC3542. 1818 */ 1819 switch (op) { 1820 case SOPT_SET: 1821 if (optlen != sizeof(int)) { 1822 error = EINVAL; 1823 break; 1824 } 1825 error = soopt_to_kbuf(sopt, &optval, 1826 sizeof optval, sizeof optval); 1827 if (error) 1828 break; 1829 if ((optval % 2) != 0) { 1830 /* the API assumes even offset values */ 1831 error = EINVAL; 1832 } else if (so->so_proto->pr_protocol == 1833 IPPROTO_ICMPV6) { 1834 if (optval != icmp6off) 1835 error = EINVAL; 1836 } else 1837 in6p->in6p_cksum = optval; 1838 break; 1839 1840 case SOPT_GET: 1841 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1842 optval = icmp6off; 1843 else 1844 optval = in6p->in6p_cksum; 1845 1846 soopt_from_kbuf(sopt, &optval, sizeof(optval)); 1847 break; 1848 1849 default: 1850 error = EINVAL; 1851 break; 1852 } 1853 break; 1854 1855 default: 1856 error = ENOPROTOOPT; 1857 break; 1858 } 1859 1860 return (error); 1861 } 1862 1863 /* 1864 * Set up IP6 options in pcb for insertion in output packets or 1865 * specifying behavior of outgoing packets. 1866 */ 1867 static int 1868 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 1869 struct socket *so, struct sockopt *sopt) 1870 { 1871 int priv = 0; 1872 struct ip6_pktopts *opt = *pktopt; 1873 int error = 0; 1874 1875 /* turn off any old options. */ 1876 if (opt) { 1877 #ifdef DIAGNOSTIC 1878 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1879 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1880 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1881 kprintf("ip6_pcbopts: all specified options are cleared.\n"); 1882 #endif 1883 ip6_clearpktopts(opt, -1); 1884 } else 1885 opt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1886 *pktopt = NULL; 1887 1888 if (!m || m->m_len == 0) { 1889 /* 1890 * Only turning off any previous options, regardless of 1891 * whether the opt is just created or given. 1892 */ 1893 kfree(opt, M_IP6OPT); 1894 return (0); 1895 } 1896 1897 /* set options specified by user. */ 1898 if ((error = ip6_setpktoptions(m, opt, NULL, so->so_proto->pr_protocol, priv)) != 0) { 1899 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 1900 kfree(opt, M_IP6OPT); 1901 return (error); 1902 } 1903 *pktopt = opt; 1904 return (0); 1905 } 1906 1907 1908 /* 1909 * Below three functions are introduced by merge to RFC3542 1910 */ 1911 1912 static int 1913 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 1914 { 1915 void *optdata = NULL; 1916 int optdatalen = 0; 1917 struct ip6_ext *ip6e; 1918 int error = 0; 1919 struct in6_pktinfo null_pktinfo; 1920 int deftclass = 0, on; 1921 int defminmtu = IP6PO_MINMTU_MCASTONLY; 1922 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 1923 1924 switch (optname) { 1925 case IPV6_PKTINFO: 1926 if (pktopt && pktopt->ip6po_pktinfo) 1927 optdata = (void *)pktopt->ip6po_pktinfo; 1928 else { 1929 /* XXX: we don't have to do this every time... */ 1930 bzero(&null_pktinfo, sizeof(null_pktinfo)); 1931 optdata = (void *)&null_pktinfo; 1932 } 1933 optdatalen = sizeof(struct in6_pktinfo); 1934 break; 1935 case IPV6_TCLASS: 1936 if (pktopt && pktopt->ip6po_tclass >= 0) 1937 optdata = (void *)&pktopt->ip6po_tclass; 1938 else 1939 optdata = (void *)&deftclass; 1940 optdatalen = sizeof(int); 1941 break; 1942 case IPV6_HOPOPTS: 1943 if (pktopt && pktopt->ip6po_hbh) { 1944 optdata = (void *)pktopt->ip6po_hbh; 1945 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 1946 optdatalen = (ip6e->ip6e_len + 1) << 3; 1947 } 1948 break; 1949 case IPV6_RTHDR: 1950 if (pktopt && pktopt->ip6po_rthdr) { 1951 optdata = (void *)pktopt->ip6po_rthdr; 1952 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 1953 optdatalen = (ip6e->ip6e_len + 1) << 3; 1954 } 1955 break; 1956 case IPV6_RTHDRDSTOPTS: 1957 if (pktopt && pktopt->ip6po_dest1) { 1958 optdata = (void *)pktopt->ip6po_dest1; 1959 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 1960 optdatalen = (ip6e->ip6e_len + 1) << 3; 1961 } 1962 break; 1963 case IPV6_DSTOPTS: 1964 if (pktopt && pktopt->ip6po_dest2) { 1965 optdata = (void *)pktopt->ip6po_dest2; 1966 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 1967 optdatalen = (ip6e->ip6e_len + 1) << 3; 1968 } 1969 break; 1970 case IPV6_NEXTHOP: 1971 if (pktopt && pktopt->ip6po_nexthop) { 1972 optdata = (void *)pktopt->ip6po_nexthop; 1973 optdatalen = pktopt->ip6po_nexthop->sa_len; 1974 } 1975 break; 1976 case IPV6_USE_MIN_MTU: 1977 if (pktopt) 1978 optdata = (void *)&pktopt->ip6po_minmtu; 1979 else 1980 optdata = (void *)&defminmtu; 1981 optdatalen = sizeof(int); 1982 break; 1983 case IPV6_DONTFRAG: 1984 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 1985 on = 1; 1986 else 1987 on = 0; 1988 optdata = (void *)&on; 1989 optdatalen = sizeof(on); 1990 break; 1991 case IPV6_PREFER_TEMPADDR: 1992 if (pktopt) 1993 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 1994 else 1995 optdata = (void *)&defpreftemp; 1996 optdatalen = sizeof(int); 1997 break; 1998 default: /* should not happen */ 1999 #ifdef DIAGNOSTIC 2000 panic("ip6_getpcbopt: unexpected option"); 2001 #endif 2002 return (ENOPROTOOPT); 2003 } 2004 2005 soopt_from_kbuf(sopt, optdata, optdatalen); 2006 2007 return (error); 2008 } 2009 2010 /* 2011 * initialize ip6_pktopts. beware that there are non-zero default values in 2012 * the struct. 2013 */ 2014 2015 static int 2016 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) 2017 { 2018 struct ip6_pktopts *opt; 2019 int priv =0; 2020 if (*pktopt == NULL) { 2021 *pktopt = kmalloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2022 init_ip6pktopts(*pktopt); 2023 } 2024 opt = *pktopt; 2025 2026 return (ip6_setpktoption(optname, buf, len, opt, 1, 0, uproto, priv)); 2027 } 2028 2029 /* 2030 * initialize ip6_pktopts. beware that there are non-zero default values in 2031 * the struct. 2032 */ 2033 void 2034 init_ip6pktopts(struct ip6_pktopts *opt) 2035 { 2036 2037 bzero(opt, sizeof(*opt)); 2038 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2039 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2040 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2041 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2042 } 2043 2044 void 2045 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2046 { 2047 if (pktopt == NULL) 2048 return; 2049 2050 if (optname == -1 || optname == IPV6_PKTINFO) { 2051 if (pktopt->ip6po_pktinfo) 2052 kfree(pktopt->ip6po_pktinfo, M_IP6OPT); 2053 pktopt->ip6po_pktinfo = NULL; 2054 } 2055 if (optname == -1 || optname == IPV6_HOPLIMIT) 2056 pktopt->ip6po_hlim = -1; 2057 if (optname == -1 || optname == IPV6_TCLASS) 2058 pktopt->ip6po_tclass = -1; 2059 if (optname == -1 || optname == IPV6_NEXTHOP) { 2060 if (pktopt->ip6po_nextroute.ro_rt) { 2061 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2062 pktopt->ip6po_nextroute.ro_rt = NULL; 2063 } 2064 if (pktopt->ip6po_nexthop) 2065 kfree(pktopt->ip6po_nexthop, M_IP6OPT); 2066 pktopt->ip6po_nexthop = NULL; 2067 } 2068 if (optname == -1 || optname == IPV6_HOPOPTS) { 2069 if (pktopt->ip6po_hbh) 2070 kfree(pktopt->ip6po_hbh, M_IP6OPT); 2071 pktopt->ip6po_hbh = NULL; 2072 } 2073 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2074 if (pktopt->ip6po_dest1) 2075 kfree(pktopt->ip6po_dest1, M_IP6OPT); 2076 pktopt->ip6po_dest1 = NULL; 2077 } 2078 if (optname == -1 || optname == IPV6_RTHDR) { 2079 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2080 kfree(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2081 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2082 if (pktopt->ip6po_route.ro_rt) { 2083 RTFREE(pktopt->ip6po_route.ro_rt); 2084 pktopt->ip6po_route.ro_rt = NULL; 2085 } 2086 } 2087 if (optname == -1 || optname == IPV6_DSTOPTS) { 2088 if (pktopt->ip6po_dest2) 2089 kfree(pktopt->ip6po_dest2, M_IP6OPT); 2090 pktopt->ip6po_dest2 = NULL; 2091 } 2092 } 2093 2094 #define PKTOPT_EXTHDRCPY(type) \ 2095 do {\ 2096 if (src->type) {\ 2097 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2098 dst->type = kmalloc(hlen, M_IP6OPT, canwait);\ 2099 if (dst->type == NULL)\ 2100 goto bad;\ 2101 bcopy(src->type, dst->type, hlen);\ 2102 }\ 2103 } while (0) 2104 2105 struct ip6_pktopts * 2106 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2107 { 2108 struct ip6_pktopts *dst; 2109 2110 if (src == NULL) { 2111 kprintf("ip6_clearpktopts: invalid argument\n"); 2112 return (NULL); 2113 } 2114 2115 dst = kmalloc(sizeof(*dst), M_IP6OPT, canwait | M_ZERO); 2116 if (dst == NULL) 2117 return (NULL); 2118 2119 dst->ip6po_hlim = src->ip6po_hlim; 2120 if (src->ip6po_pktinfo) { 2121 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2122 M_IP6OPT, canwait); 2123 if (dst->ip6po_pktinfo == NULL) 2124 goto bad; 2125 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2126 } 2127 if (src->ip6po_nexthop) { 2128 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2129 M_IP6OPT, canwait); 2130 if (dst->ip6po_nexthop == NULL) 2131 goto bad; 2132 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2133 src->ip6po_nexthop->sa_len); 2134 } 2135 PKTOPT_EXTHDRCPY(ip6po_hbh); 2136 PKTOPT_EXTHDRCPY(ip6po_dest1); 2137 PKTOPT_EXTHDRCPY(ip6po_dest2); 2138 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2139 return (dst); 2140 2141 bad: 2142 if (dst->ip6po_pktinfo) kfree(dst->ip6po_pktinfo, M_IP6OPT); 2143 if (dst->ip6po_nexthop) kfree(dst->ip6po_nexthop, M_IP6OPT); 2144 if (dst->ip6po_hbh) kfree(dst->ip6po_hbh, M_IP6OPT); 2145 if (dst->ip6po_dest1) kfree(dst->ip6po_dest1, M_IP6OPT); 2146 if (dst->ip6po_dest2) kfree(dst->ip6po_dest2, M_IP6OPT); 2147 if (dst->ip6po_rthdr) kfree(dst->ip6po_rthdr, M_IP6OPT); 2148 kfree(dst, M_IP6OPT); 2149 return (NULL); 2150 } 2151 2152 static int 2153 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2154 { 2155 if (dst == NULL || src == NULL) { 2156 #ifdef DIAGNOSTIC 2157 kprintf("ip6_clearpktopts: invalid argument\n"); 2158 #endif 2159 return (EINVAL); 2160 } 2161 2162 dst->ip6po_hlim = src->ip6po_hlim; 2163 dst->ip6po_tclass = src->ip6po_tclass; 2164 dst->ip6po_flags = src->ip6po_flags; 2165 if (src->ip6po_pktinfo) { 2166 dst->ip6po_pktinfo = kmalloc(sizeof(*dst->ip6po_pktinfo), 2167 M_IP6OPT, canwait); 2168 if (dst->ip6po_pktinfo == NULL) 2169 goto bad; 2170 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2171 } 2172 if (src->ip6po_nexthop) { 2173 dst->ip6po_nexthop = kmalloc(src->ip6po_nexthop->sa_len, 2174 M_IP6OPT, canwait); 2175 if (dst->ip6po_nexthop == NULL) 2176 goto bad; 2177 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2178 src->ip6po_nexthop->sa_len); 2179 } 2180 PKTOPT_EXTHDRCPY(ip6po_hbh); 2181 PKTOPT_EXTHDRCPY(ip6po_dest1); 2182 PKTOPT_EXTHDRCPY(ip6po_dest2); 2183 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2184 return (0); 2185 2186 bad: 2187 ip6_clearpktopts(dst, -1); 2188 return (ENOBUFS); 2189 } 2190 #undef PKTOPT_EXTHDRCPY 2191 2192 void 2193 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2194 { 2195 if (pktopt == NULL) 2196 return; 2197 2198 ip6_clearpktopts(pktopt, -1); 2199 2200 kfree(pktopt, M_IP6OPT); 2201 } 2202 2203 /* 2204 * Set the IP6 multicast options in response to user setsockopt(). 2205 */ 2206 static int 2207 ip6_setmoptions(int optname, struct ip6_moptions **im6op, struct mbuf *m) 2208 { 2209 int error = 0; 2210 u_int loop, ifindex; 2211 struct ipv6_mreq *mreq; 2212 struct ifnet *ifp; 2213 struct ip6_moptions *im6o = *im6op; 2214 struct route_in6 ro; 2215 struct sockaddr_in6 *dst; 2216 struct in6_multi_mship *imm; 2217 2218 if (im6o == NULL) { 2219 /* 2220 * No multicast option buffer attached to the pcb; 2221 * allocate one and initialize to default values. 2222 */ 2223 im6o = (struct ip6_moptions *) 2224 kmalloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2225 2226 *im6op = im6o; 2227 im6o->im6o_multicast_ifp = NULL; 2228 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2229 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2230 LIST_INIT(&im6o->im6o_memberships); 2231 } 2232 2233 switch (optname) { 2234 2235 case IPV6_MULTICAST_IF: 2236 /* 2237 * Select the interface for outgoing multicast packets. 2238 */ 2239 if (m == NULL || m->m_len != sizeof(u_int)) { 2240 error = EINVAL; 2241 break; 2242 } 2243 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2244 if (ifindex < 0 || if_index < ifindex) { 2245 error = ENXIO; /* XXX EINVAL? */ 2246 break; 2247 } 2248 ifp = ifindex2ifnet[ifindex]; 2249 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2250 error = EADDRNOTAVAIL; 2251 break; 2252 } 2253 im6o->im6o_multicast_ifp = ifp; 2254 break; 2255 2256 case IPV6_MULTICAST_HOPS: 2257 { 2258 /* 2259 * Set the IP6 hoplimit for outgoing multicast packets. 2260 */ 2261 int optval; 2262 if (m == NULL || m->m_len != sizeof(int)) { 2263 error = EINVAL; 2264 break; 2265 } 2266 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2267 if (optval < -1 || optval >= 256) 2268 error = EINVAL; 2269 else if (optval == -1) 2270 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2271 else 2272 im6o->im6o_multicast_hlim = optval; 2273 break; 2274 } 2275 2276 case IPV6_MULTICAST_LOOP: 2277 /* 2278 * Set the loopback flag for outgoing multicast packets. 2279 * Must be zero or one. 2280 */ 2281 if (m == NULL || m->m_len != sizeof(u_int)) { 2282 error = EINVAL; 2283 break; 2284 } 2285 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2286 if (loop > 1) { 2287 error = EINVAL; 2288 break; 2289 } 2290 im6o->im6o_multicast_loop = loop; 2291 break; 2292 2293 case IPV6_JOIN_GROUP: 2294 /* 2295 * Add a multicast group membership. 2296 * Group must be a valid IP6 multicast address. 2297 */ 2298 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2299 error = EINVAL; 2300 break; 2301 } 2302 mreq = mtod(m, struct ipv6_mreq *); 2303 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2304 /* 2305 * We use the unspecified address to specify to accept 2306 * all multicast addresses. Only super user is allowed 2307 * to do this. 2308 */ 2309 if (caps_priv_check_self(SYSCAP_RESTRICTEDROOT)) { 2310 error = EACCES; 2311 break; 2312 } 2313 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2314 error = EINVAL; 2315 break; 2316 } 2317 2318 /* 2319 * If the interface is specified, validate it. 2320 */ 2321 if (mreq->ipv6mr_interface < 0 2322 || if_index < mreq->ipv6mr_interface) { 2323 error = ENXIO; /* XXX EINVAL? */ 2324 break; 2325 } 2326 /* 2327 * If no interface was explicitly specified, choose an 2328 * appropriate one according to the given multicast address. 2329 */ 2330 if (mreq->ipv6mr_interface == 0) { 2331 /* 2332 * If the multicast address is in node-local scope, 2333 * the interface should be a loopback interface. 2334 * Otherwise, look up the routing table for the 2335 * address, and choose the outgoing interface. 2336 * XXX: is it a good approach? 2337 */ 2338 if (IN6_IS_ADDR_MC_INTFACELOCAL(&mreq->ipv6mr_multiaddr)) { 2339 ifp = loif; 2340 } else { 2341 ro.ro_rt = NULL; 2342 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2343 bzero(dst, sizeof(*dst)); 2344 dst->sin6_len = sizeof(struct sockaddr_in6); 2345 dst->sin6_family = AF_INET6; 2346 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2347 rtalloc((struct route *)&ro); 2348 if (ro.ro_rt == NULL) { 2349 error = EADDRNOTAVAIL; 2350 break; 2351 } 2352 ifp = ro.ro_rt->rt_ifp; 2353 rtfree(ro.ro_rt); 2354 } 2355 } else 2356 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2357 2358 /* 2359 * See if we found an interface, and confirm that it 2360 * supports multicast 2361 */ 2362 if (ifp == NULL || !(ifp->if_flags & IFF_MULTICAST)) { 2363 error = EADDRNOTAVAIL; 2364 break; 2365 } 2366 /* 2367 * Put interface index into the multicast address, 2368 * if the address has link-local scope. 2369 */ 2370 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2371 mreq->ipv6mr_multiaddr.s6_addr16[1] 2372 = htons(mreq->ipv6mr_interface); 2373 } 2374 /* 2375 * See if the membership already exists. 2376 */ 2377 for (imm = im6o->im6o_memberships.lh_first; 2378 imm != NULL; imm = imm->i6mm_chain.le_next) 2379 if (imm->i6mm_maddr->in6m_ifp == ifp && 2380 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2381 &mreq->ipv6mr_multiaddr)) 2382 break; 2383 if (imm != NULL) { 2384 error = EADDRINUSE; 2385 break; 2386 } 2387 /* 2388 * Everything looks good; add a new record to the multicast 2389 * address list for the given interface. 2390 */ 2391 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2392 if ((imm->i6mm_maddr = 2393 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2394 kfree(imm, M_IPMADDR); 2395 break; 2396 } 2397 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2398 break; 2399 2400 case IPV6_LEAVE_GROUP: 2401 /* 2402 * Drop a multicast group membership. 2403 * Group must be a valid IP6 multicast address. 2404 */ 2405 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2406 error = EINVAL; 2407 break; 2408 } 2409 mreq = mtod(m, struct ipv6_mreq *); 2410 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2411 if (caps_priv_check_self(SYSCAP_RESTRICTEDROOT)) { 2412 error = EACCES; 2413 break; 2414 } 2415 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2416 error = EINVAL; 2417 break; 2418 } 2419 /* 2420 * If an interface address was specified, get a pointer 2421 * to its ifnet structure. 2422 */ 2423 if (mreq->ipv6mr_interface < 0 2424 || if_index < mreq->ipv6mr_interface) { 2425 error = ENXIO; /* XXX EINVAL? */ 2426 break; 2427 } 2428 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2429 /* 2430 * Put interface index into the multicast address, 2431 * if the address has link-local scope. 2432 */ 2433 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2434 mreq->ipv6mr_multiaddr.s6_addr16[1] 2435 = htons(mreq->ipv6mr_interface); 2436 } 2437 2438 /* 2439 * Find the membership in the membership list. 2440 */ 2441 for (imm = im6o->im6o_memberships.lh_first; 2442 imm != NULL; imm = imm->i6mm_chain.le_next) { 2443 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2444 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2445 &mreq->ipv6mr_multiaddr)) 2446 break; 2447 } 2448 if (imm == NULL) { 2449 /* Unable to resolve interface */ 2450 error = EADDRNOTAVAIL; 2451 break; 2452 } 2453 /* 2454 * Give up the multicast address record to which the 2455 * membership points. 2456 */ 2457 LIST_REMOVE(imm, i6mm_chain); 2458 in6_delmulti(imm->i6mm_maddr); 2459 kfree(imm, M_IPMADDR); 2460 break; 2461 2462 default: 2463 error = EOPNOTSUPP; 2464 break; 2465 } 2466 2467 /* 2468 * If all options have default values, no need to keep the mbuf. 2469 */ 2470 if (im6o->im6o_multicast_ifp == NULL && 2471 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2472 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2473 im6o->im6o_memberships.lh_first == NULL) { 2474 kfree(*im6op, M_IPMOPTS); 2475 *im6op = NULL; 2476 } 2477 2478 return (error); 2479 } 2480 2481 /* 2482 * Return the IP6 multicast options in response to user getsockopt(). 2483 */ 2484 static int 2485 ip6_getmoptions(int optname, struct ip6_moptions *im6o, struct mbuf **mp) 2486 { 2487 u_int *hlim, *loop, *ifindex; 2488 2489 *mp = m_get(M_WAITOK, MT_HEADER); /* XXX */ 2490 2491 switch (optname) { 2492 2493 case IPV6_MULTICAST_IF: 2494 ifindex = mtod(*mp, u_int *); 2495 (*mp)->m_len = sizeof(u_int); 2496 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2497 *ifindex = 0; 2498 else 2499 *ifindex = im6o->im6o_multicast_ifp->if_index; 2500 return (0); 2501 2502 case IPV6_MULTICAST_HOPS: 2503 hlim = mtod(*mp, u_int *); 2504 (*mp)->m_len = sizeof(u_int); 2505 if (im6o == NULL) 2506 *hlim = ip6_defmcasthlim; 2507 else 2508 *hlim = im6o->im6o_multicast_hlim; 2509 return (0); 2510 2511 case IPV6_MULTICAST_LOOP: 2512 loop = mtod(*mp, u_int *); 2513 (*mp)->m_len = sizeof(u_int); 2514 if (im6o == NULL) 2515 *loop = ip6_defmcasthlim; 2516 else 2517 *loop = im6o->im6o_multicast_loop; 2518 return (0); 2519 2520 default: 2521 return (EOPNOTSUPP); 2522 } 2523 } 2524 2525 /* 2526 * Discard the IP6 multicast options. 2527 */ 2528 void 2529 ip6_freemoptions(struct ip6_moptions *im6o) 2530 { 2531 struct in6_multi_mship *imm; 2532 2533 if (im6o == NULL) 2534 return; 2535 2536 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2537 LIST_REMOVE(imm, i6mm_chain); 2538 if (imm->i6mm_maddr) 2539 in6_delmulti(imm->i6mm_maddr); 2540 kfree(imm, M_IPMADDR); 2541 } 2542 kfree(im6o, M_IPMOPTS); 2543 } 2544 2545 /* 2546 * Set a particular packet option, as a sticky option or an ancillary data 2547 * item. "len" can be 0 only when it's a sticky option. 2548 * We have 4 cases of combination of "sticky" and "cmsg": 2549 * "sticky=0, cmsg=0": impossible 2550 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2551 * "sticky=1, cmsg=0": RFC3542 socket option 2552 * "sticky=1, cmsg=1": RFC2292 socket option 2553 */ 2554 static int 2555 ip6_setpktoption(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2556 int sticky, int cmsg, int uproto, int priv) 2557 { 2558 int minmtupolicy, preftemp; 2559 //int error; 2560 2561 if (!sticky && !cmsg) { 2562 kprintf("ip6_setpktoption: impossible case\n"); 2563 return (EINVAL); 2564 } 2565 2566 /* 2567 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2568 * not be specified in the context of RFC3542. Conversely, 2569 * RFC3542 types should not be specified in the context of RFC2292. 2570 */ 2571 if (!cmsg) { 2572 switch (optname) { 2573 case IPV6_2292PKTINFO: 2574 case IPV6_2292HOPLIMIT: 2575 case IPV6_2292NEXTHOP: 2576 case IPV6_2292HOPOPTS: 2577 case IPV6_2292DSTOPTS: 2578 case IPV6_2292RTHDR: 2579 case IPV6_2292PKTOPTIONS: 2580 return (ENOPROTOOPT); 2581 } 2582 } 2583 if (sticky && cmsg) { 2584 switch (optname) { 2585 case IPV6_PKTINFO: 2586 case IPV6_HOPLIMIT: 2587 case IPV6_NEXTHOP: 2588 case IPV6_HOPOPTS: 2589 case IPV6_DSTOPTS: 2590 case IPV6_RTHDRDSTOPTS: 2591 case IPV6_RTHDR: 2592 case IPV6_USE_MIN_MTU: 2593 case IPV6_DONTFRAG: 2594 case IPV6_TCLASS: 2595 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2596 return (ENOPROTOOPT); 2597 } 2598 } 2599 2600 switch (optname) { 2601 case IPV6_2292PKTINFO: 2602 case IPV6_PKTINFO: 2603 { 2604 struct in6_pktinfo *pktinfo; 2605 if (len != sizeof(struct in6_pktinfo)) 2606 return (EINVAL); 2607 pktinfo = (struct in6_pktinfo *)buf; 2608 2609 /* 2610 * An application can clear any sticky IPV6_PKTINFO option by 2611 * doing a "regular" setsockopt with ipi6_addr being 2612 * in6addr_any and ipi6_ifindex being zero. 2613 * [RFC 3542, Section 6] 2614 */ 2615 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2616 pktinfo->ipi6_ifindex == 0 && 2617 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2618 ip6_clearpktopts(opt, optname); 2619 break; 2620 } 2621 2622 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2623 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2624 return (EINVAL); 2625 } 2626 2627 /* validate the interface index if specified. */ 2628 if (pktinfo->ipi6_ifindex > if_index || 2629 pktinfo->ipi6_ifindex < 0) { 2630 return (ENXIO); 2631 } 2632 /* 2633 * Check if the requested source address is indeed a 2634 * unicast address assigned to the node, and can be 2635 * used as the packet's source address. 2636 */ 2637 if (opt->ip6po_pktinfo != NULL && 2638 !IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2639 struct in6_ifaddr *ia6; 2640 struct sockaddr_in6 sin6; 2641 2642 bzero(&sin6, sizeof(sin6)); 2643 sin6.sin6_len = sizeof(sin6); 2644 sin6.sin6_family = AF_INET6; 2645 sin6.sin6_addr = 2646 opt->ip6po_pktinfo->ipi6_addr; 2647 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2648 if (ia6 == NULL || 2649 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2650 IN6_IFF_NOTREADY)) != 0) 2651 return (EADDRNOTAVAIL); 2652 } 2653 2654 /* 2655 * We store the address anyway, and let in6_selectsrc() 2656 * validate the specified address. This is because ipi6_addr 2657 * may not have enough information about its scope zone, and 2658 * we may need additional information (such as outgoing 2659 * interface or the scope zone of a destination address) to 2660 * disambiguate the scope. 2661 * XXX: the delay of the validation may confuse the 2662 * application when it is used as a sticky option. 2663 */ 2664 if (opt->ip6po_pktinfo == NULL) { 2665 opt->ip6po_pktinfo = kmalloc(sizeof(*pktinfo), 2666 M_IP6OPT, M_NOWAIT); 2667 if (opt->ip6po_pktinfo == NULL) 2668 return (ENOBUFS); 2669 } 2670 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2671 break; 2672 } 2673 2674 case IPV6_2292HOPLIMIT: 2675 case IPV6_HOPLIMIT: 2676 { 2677 int *hlimp; 2678 2679 /* 2680 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2681 * to simplify the ordering among hoplimit options. 2682 */ 2683 if (optname == IPV6_HOPLIMIT && sticky) 2684 return (ENOPROTOOPT); 2685 2686 if (len != sizeof(int)) 2687 return (EINVAL); 2688 hlimp = (int *)buf; 2689 if (*hlimp < -1 || *hlimp > 255) 2690 return (EINVAL); 2691 2692 opt->ip6po_hlim = *hlimp; 2693 break; 2694 } 2695 2696 case IPV6_TCLASS: 2697 { 2698 int tclass; 2699 2700 if (len != sizeof(int)) 2701 return (EINVAL); 2702 tclass = *(int *)buf; 2703 if (tclass < -1 || tclass > 255) 2704 return (EINVAL); 2705 2706 opt->ip6po_tclass = tclass; 2707 break; 2708 } 2709 2710 case IPV6_2292NEXTHOP: 2711 case IPV6_NEXTHOP: 2712 if (!priv) 2713 return (EPERM); 2714 2715 if (len == 0) { /* just remove the option */ 2716 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2717 break; 2718 } 2719 2720 /* check if cmsg_len is large enough for sa_len */ 2721 if (len < sizeof(struct sockaddr) || len < *buf) 2722 return (EINVAL); 2723 2724 switch (((struct sockaddr *)buf)->sa_family) { 2725 case AF_INET6: 2726 { 2727 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2728 //int error; 2729 2730 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2731 return (EINVAL); 2732 2733 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2734 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2735 return (EINVAL); 2736 } 2737 break; 2738 } 2739 case AF_LINK: /* should eventually be supported */ 2740 default: 2741 return (EAFNOSUPPORT); 2742 } 2743 2744 /* turn off the previous option, then set the new option. */ 2745 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2746 opt->ip6po_nexthop = kmalloc(*buf, M_IP6OPT, M_NOWAIT); 2747 if (opt->ip6po_nexthop == NULL) 2748 return (ENOBUFS); 2749 bcopy(buf, opt->ip6po_nexthop, *buf); 2750 break; 2751 2752 case IPV6_2292HOPOPTS: 2753 case IPV6_HOPOPTS: 2754 { 2755 struct ip6_hbh *hbh; 2756 int hbhlen; 2757 2758 /* 2759 * XXX: We don't allow a non-privileged user to set ANY HbH 2760 * options, since per-option restriction has too much 2761 * overhead. 2762 */ 2763 if (!priv) 2764 return (EPERM); 2765 if (len == 0) { 2766 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2767 break; /* just remove the option */ 2768 } 2769 2770 /* message length validation */ 2771 if (len < sizeof(struct ip6_hbh)) 2772 return (EINVAL); 2773 hbh = (struct ip6_hbh *)buf; 2774 hbhlen = (hbh->ip6h_len + 1) << 3; 2775 if (len != hbhlen) 2776 return (EINVAL); 2777 2778 /* turn off the previous option, then set the new option. */ 2779 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2780 opt->ip6po_hbh = kmalloc(hbhlen, M_IP6OPT, M_NOWAIT); 2781 if (opt->ip6po_hbh == NULL) 2782 return (ENOBUFS); 2783 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2784 2785 break; 2786 } 2787 2788 case IPV6_2292DSTOPTS: 2789 case IPV6_DSTOPTS: 2790 case IPV6_RTHDRDSTOPTS: 2791 { 2792 struct ip6_dest *dest, **newdest = NULL; 2793 int destlen; 2794 if (!priv) 2795 return (EPERM); 2796 2797 if (len == 0) { 2798 ip6_clearpktopts(opt, optname); 2799 break; /* just remove the option */ 2800 } 2801 2802 /* message length validation */ 2803 if (len < sizeof(struct ip6_dest)) 2804 return (EINVAL); 2805 dest = (struct ip6_dest *)buf; 2806 destlen = (dest->ip6d_len + 1) << 3; 2807 if (len != destlen) 2808 return (EINVAL); 2809 2810 /* 2811 * Determine the position that the destination options header 2812 * should be inserted; before or after the routing header. 2813 */ 2814 switch (optname) { 2815 case IPV6_2292DSTOPTS: 2816 /* 2817 * The old advacned API is ambiguous on this point. 2818 * Our approach is to determine the position based 2819 * according to the existence of a routing header. 2820 * Note, however, that this depends on the order of the 2821 * extension headers in the ancillary data; the 1st 2822 * part of the destination options header must appear 2823 * before the routing header in the ancillary data, 2824 * too. 2825 * RFC3542 solved the ambiguity by introducing 2826 * separate ancillary data or option types. 2827 */ 2828 if (opt->ip6po_rthdr == NULL) 2829 newdest = &opt->ip6po_dest1; 2830 else 2831 newdest = &opt->ip6po_dest2; 2832 break; 2833 case IPV6_RTHDRDSTOPTS: 2834 newdest = &opt->ip6po_dest1; 2835 break; 2836 case IPV6_DSTOPTS: 2837 newdest = &opt->ip6po_dest2; 2838 break; 2839 } 2840 2841 /* turn off the previous option, then set the new option. */ 2842 ip6_clearpktopts(opt, optname); 2843 *newdest = kmalloc(destlen, M_IP6OPT, M_NOWAIT); 2844 if (*newdest == NULL) 2845 return (ENOBUFS); 2846 bcopy(dest, *newdest, destlen); 2847 2848 break; 2849 } 2850 2851 case IPV6_2292RTHDR: 2852 case IPV6_RTHDR: 2853 { 2854 struct ip6_rthdr *rth; 2855 int rthlen; 2856 2857 if (len == 0) { 2858 ip6_clearpktopts(opt, IPV6_RTHDR); 2859 break; /* just remove the option */ 2860 } 2861 2862 /* message length validation */ 2863 if (len < sizeof(struct ip6_rthdr)) 2864 return (EINVAL); 2865 rth = (struct ip6_rthdr *)buf; 2866 rthlen = (rth->ip6r_len + 1) << 3; 2867 if (len != rthlen) 2868 return (EINVAL); 2869 2870 switch (rth->ip6r_type) { 2871 default: 2872 return (EINVAL); /* not supported */ 2873 } 2874 2875 /* turn off the previous option */ 2876 ip6_clearpktopts(opt, IPV6_RTHDR); 2877 opt->ip6po_rthdr = kmalloc(rthlen, M_IP6OPT, M_NOWAIT); 2878 if (opt->ip6po_rthdr == NULL) 2879 return (ENOBUFS); 2880 bcopy(rth, opt->ip6po_rthdr, rthlen); 2881 2882 break; 2883 } 2884 2885 case IPV6_USE_MIN_MTU: 2886 if (len != sizeof(int)) 2887 return (EINVAL); 2888 minmtupolicy = *(int *)buf; 2889 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2890 minmtupolicy != IP6PO_MINMTU_DISABLE && 2891 minmtupolicy != IP6PO_MINMTU_ALL) { 2892 return (EINVAL); 2893 } 2894 opt->ip6po_minmtu = minmtupolicy; 2895 break; 2896 2897 case IPV6_DONTFRAG: 2898 if (len != sizeof(int)) 2899 return (EINVAL); 2900 2901 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2902 /* 2903 * we ignore this option for TCP sockets. 2904 * (RFC3542 leaves this case unspecified.) 2905 */ 2906 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2907 } else 2908 opt->ip6po_flags |= IP6PO_DONTFRAG; 2909 break; 2910 2911 case IPV6_PREFER_TEMPADDR: 2912 if (len != sizeof(int)) 2913 return (EINVAL); 2914 preftemp = *(int *)buf; 2915 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2916 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2917 preftemp != IP6PO_TEMPADDR_PREFER) { 2918 return (EINVAL); 2919 } 2920 opt->ip6po_prefer_tempaddr = preftemp; 2921 break; 2922 2923 default: 2924 return (ENOPROTOOPT); 2925 } /* end of switch */ 2926 2927 return (0); 2928 } 2929 2930 2931 /* 2932 * Set IPv6 outgoing packet options based on advanced API. 2933 */ 2934 int 2935 ip6_setpktoptions(struct mbuf *control, struct ip6_pktopts *opt, 2936 struct ip6_pktopts *stickyopt, int uproto, int priv) 2937 { 2938 struct cmsghdr *cm = NULL; 2939 2940 if (control == NULL || opt == NULL) 2941 return (EINVAL); 2942 2943 init_ip6pktopts(opt); 2944 2945 /* 2946 * XXX: Currently, we assume all the optional information is stored 2947 * in a single mbuf. 2948 */ 2949 if (stickyopt) { 2950 int error; 2951 2952 /* 2953 * If stickyopt is provided, make a local copy of the options 2954 * for this particular packet, then override them by ancillary 2955 * objects. 2956 * XXX: copypktopts() does not copy the cached route to a next 2957 * hop (if any). This is not very good in terms of efficiency, 2958 * but we can allow this since this option should be rarely 2959 * used. 2960 */ 2961 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2962 return (error); 2963 } 2964 2965 /* 2966 * XXX: Currently, we assume all the optional information is stored 2967 * in a single mbuf. 2968 */ 2969 if (control->m_next) 2970 return (EINVAL); 2971 2972 for (;;) { 2973 int error; 2974 2975 if (control->m_len == 0) 2976 break; 2977 if (control->m_len < sizeof(*cm)) 2978 return EINVAL; 2979 2980 cm = mtod(control, struct cmsghdr *); 2981 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2982 return (EINVAL); 2983 if (cm->cmsg_level == IPPROTO_IPV6) { 2984 error = ip6_setpktoption(cm->cmsg_type, CMSG_DATA(cm), 2985 cm->cmsg_len - CMSG_LEN(0), 2986 opt, 0, 1, uproto, priv); 2987 if (error) 2988 return (error); 2989 } 2990 2991 /* 2992 * The cmsg fit, but the aligned step for the next one might 2993 * not. Check the case and terminate normally (allows the 2994 * cmsg_len to not be aligned). 2995 */ 2996 if (CMSG_ALIGN(cm->cmsg_len) >= control->m_len) { 2997 control->m_data += control->m_len; 2998 control->m_len = 0; 2999 break; 3000 } 3001 control->m_data += CMSG_ALIGN(cm->cmsg_len); 3002 control->m_len -= CMSG_ALIGN(cm->cmsg_len); 3003 } 3004 3005 return (0); 3006 } 3007 3008 /* 3009 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3010 * packet to the input queue of a specified interface. Note that this 3011 * calls the output routine of the loopback "driver", but with an interface 3012 * pointer that might NOT be loif -- easier than replicating that code here. 3013 */ 3014 void 3015 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 3016 { 3017 struct mbuf *copym; 3018 struct ip6_hdr *ip6; 3019 3020 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT); 3021 if (copym == NULL) 3022 return; 3023 3024 /* 3025 * Make sure to deep-copy IPv6 header portion in case the data 3026 * is in an mbuf cluster, so that we can safely override the IPv6 3027 * header portion later. 3028 */ 3029 if ((copym->m_flags & M_EXT) != 0 || 3030 copym->m_len < sizeof(struct ip6_hdr)) { 3031 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3032 if (copym == NULL) 3033 return; 3034 } 3035 3036 #ifdef DIAGNOSTIC 3037 if (copym->m_len < sizeof(*ip6)) { 3038 m_freem(copym); 3039 return; 3040 } 3041 #endif 3042 3043 ip6 = mtod(copym, struct ip6_hdr *); 3044 /* 3045 * clear embedded scope identifiers if necessary. 3046 * in6_clearscope will touch the addresses only when necessary. 3047 */ 3048 in6_clearscope(&ip6->ip6_src); 3049 in6_clearscope(&ip6->ip6_dst); 3050 3051 if_simloop(ifp, copym, dst->sin6_family, 0); 3052 } 3053 3054 /* 3055 * Separate the IPv6 header from the payload into its own mbuf. 3056 * 3057 * Returns the new mbuf chain or the original mbuf if no payload. 3058 * Returns NULL if can't allocate new mbuf for header. 3059 */ 3060 static struct mbuf * 3061 ip6_splithdr(struct mbuf *m) 3062 { 3063 struct mbuf *mh; 3064 3065 if (m->m_len <= sizeof(struct ip6_hdr)) /* no payload */ 3066 return (m); 3067 3068 MGETHDR(mh, M_NOWAIT, MT_HEADER); 3069 if (mh == NULL) 3070 return (NULL); 3071 mh->m_len = sizeof(struct ip6_hdr); 3072 M_MOVE_PKTHDR(mh, m); 3073 MH_ALIGN(mh, sizeof(struct ip6_hdr)); 3074 bcopy(mtod(m, caddr_t), mtod(mh, caddr_t), sizeof(struct ip6_hdr)); 3075 m->m_data += sizeof(struct ip6_hdr); 3076 m->m_len -= sizeof(struct ip6_hdr); 3077 mh->m_next = m; 3078 return (mh); 3079 } 3080 3081 /* 3082 * Compute IPv6 extension header length. 3083 */ 3084 int 3085 ip6_optlen(struct in6pcb *in6p) 3086 { 3087 int len; 3088 3089 if (!in6p->in6p_outputopts) 3090 return 0; 3091 3092 len = 0; 3093 #define elen(x) \ 3094 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3095 3096 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3097 if (in6p->in6p_outputopts->ip6po_rthdr) 3098 /* dest1 is valid with rthdr only */ 3099 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3100 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3101 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3102 return len; 3103 #undef elen 3104 } 3105