ip6_output.c revision 274132
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32/*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63#include <sys/cdefs.h> 64__FBSDID("$FreeBSD: stable/10/sys/netinet6/ip6_output.c 274132 2014-11-05 09:23:29Z ae $"); 65 66#include "opt_inet.h" 67#include "opt_inet6.h" 68#include "opt_ipfw.h" 69#include "opt_ipsec.h" 70#include "opt_sctp.h" 71#include "opt_route.h" 72 73#include <sys/param.h> 74#include <sys/kernel.h> 75#include <sys/malloc.h> 76#include <sys/mbuf.h> 77#include <sys/errno.h> 78#include <sys/priv.h> 79#include <sys/proc.h> 80#include <sys/protosw.h> 81#include <sys/socket.h> 82#include <sys/socketvar.h> 83#include <sys/syslog.h> 84#include <sys/ucred.h> 85 86#include <machine/in_cksum.h> 87 88#include <net/if.h> 89#include <net/netisr.h> 90#include <net/route.h> 91#include <net/pfil.h> 92#include <net/vnet.h> 93 94#include <netinet/in.h> 95#include <netinet/in_var.h> 96#include <netinet/ip_var.h> 97#include <netinet6/in6_var.h> 98#include <netinet/ip6.h> 99#include <netinet/icmp6.h> 100#include <netinet6/ip6_var.h> 101#include <netinet/in_pcb.h> 102#include <netinet/tcp_var.h> 103#include <netinet6/nd6.h> 104 105#ifdef IPSEC 106#include <netipsec/ipsec.h> 107#include <netipsec/ipsec6.h> 108#include <netipsec/key.h> 109#include <netinet6/ip6_ipsec.h> 110#endif /* IPSEC */ 111#ifdef SCTP 112#include <netinet/sctp.h> 113#include <netinet/sctp_crc32.h> 114#endif 115 116#include <netinet6/ip6protosw.h> 117#include <netinet6/scope6_var.h> 118 119#ifdef FLOWTABLE 120#include <net/flowtable.h> 121#endif 122 123extern int in6_mcast_loop; 124 125struct ip6_exthdrs { 126 struct mbuf *ip6e_ip6; 127 struct mbuf *ip6e_hbh; 128 struct mbuf *ip6e_dest1; 129 struct mbuf *ip6e_rthdr; 130 struct mbuf *ip6e_dest2; 131}; 132 133static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *); 137static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int); 140 141static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int); 148static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 149 150 151/* 152 * Make an extension header from option data. hp is the source, and 153 * mp is the destination. 154 */ 155#define MAKE_EXTHDR(hp, mp) \ 156 do { \ 157 if (hp) { \ 158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 160 ((eh)->ip6e_len + 1) << 3); \ 161 if (error) \ 162 goto freehdrs; \ 163 } \ 164 } while (/*CONSTCOND*/ 0) 165 166/* 167 * Form a chain of extension headers. 168 * m is the extension header mbuf 169 * mp is the previous mbuf in the chain 170 * p is the next header 171 * i is the type of option. 172 */ 173#define MAKE_CHAIN(m, mp, p, i)\ 174 do {\ 175 if (m) {\ 176 if (!hdrsplit) \ 177 panic("assumption failed: hdr not split"); \ 178 *mtod((m), u_char *) = *(p);\ 179 *(p) = (i);\ 180 p = mtod((m), u_char *);\ 181 (m)->m_next = (mp)->m_next;\ 182 (mp)->m_next = (m);\ 183 (mp) = (m);\ 184 }\ 185 } while (/*CONSTCOND*/ 0) 186 187void 188in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 189{ 190 u_short csum; 191 192 csum = in_cksum_skip(m, offset + plen, offset); 193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 194 csum = 0xffff; 195 offset += m->m_pkthdr.csum_data; /* checksum offset */ 196 197 if (offset + sizeof(u_short) > m->m_len) { 198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u " 199 "csum_flags=%b\n", __func__, m->m_len, plen, offset, 200 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 201 /* 202 * XXX this should not happen, but if it does, the correct 203 * behavior may be to insert the checksum in the appropriate 204 * next mbuf in the chain. 205 */ 206 return; 207 } 208 *(u_short *)(m->m_data + offset) = csum; 209} 210 211/* 212 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 213 * header (with pri, len, nxt, hlim, src, dst). 214 * This function may modify ver and hlim only. 215 * The mbuf chain containing the packet will be freed. 216 * The mbuf opt, if present, will not be freed. 217 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 218 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 219 * then result of route lookup is stored in ro->ro_rt. 220 * 221 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 222 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 223 * which is rt_mtu. 224 * 225 * ifpp - XXX: just for statistics 226 */ 227int 228ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 229 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 230 struct ifnet **ifpp, struct inpcb *inp) 231{ 232 struct ip6_hdr *ip6, *mhip6; 233 struct ifnet *ifp, *origifp; 234 struct mbuf *m = m0; 235 struct mbuf *mprev = NULL; 236 int hlen, tlen, len, off; 237 struct route_in6 ip6route; 238 struct rtentry *rt = NULL; 239 struct sockaddr_in6 *dst, src_sa, dst_sa; 240 struct in6_addr odst; 241 int error = 0; 242 struct in6_ifaddr *ia = NULL; 243 u_long mtu; 244 int alwaysfrag, dontfrag; 245 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 246 struct ip6_exthdrs exthdrs; 247 struct in6_addr finaldst, src0, dst0; 248 u_int32_t zone; 249 struct route_in6 *ro_pmtu = NULL; 250 int hdrsplit = 0; 251 int sw_csum, tso; 252 struct m_tag *fwd_tag = NULL; 253 254 ip6 = mtod(m, struct ip6_hdr *); 255 if (ip6 == NULL) { 256 printf ("ip6 is NULL"); 257 goto bad; 258 } 259 260 if (inp != NULL) 261 M_SETFIB(m, inp->inp_inc.inc_fibnum); 262 263 finaldst = ip6->ip6_dst; 264 bzero(&exthdrs, sizeof(exthdrs)); 265 if (opt) { 266 /* Hop-by-Hop options header */ 267 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 268 /* Destination options header(1st part) */ 269 if (opt->ip6po_rthdr) { 270 /* 271 * Destination options header(1st part) 272 * This only makes sense with a routing header. 273 * See Section 9.2 of RFC 3542. 274 * Disabling this part just for MIP6 convenience is 275 * a bad idea. We need to think carefully about a 276 * way to make the advanced API coexist with MIP6 277 * options, which might automatically be inserted in 278 * the kernel. 279 */ 280 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 281 } 282 /* Routing header */ 283 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 284 /* Destination options header(2nd part) */ 285 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 286 } 287 288#ifdef IPSEC 289 /* 290 * IPSec checking which handles several cases. 291 * FAST IPSEC: We re-injected the packet. 292 */ 293 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp)) 294 { 295 case 1: /* Bad packet */ 296 goto freehdrs; 297 case -1: /* IPSec done */ 298 goto done; 299 case 0: /* No IPSec */ 300 default: 301 break; 302 } 303#endif /* IPSEC */ 304 305 /* 306 * Calculate the total length of the extension header chain. 307 * Keep the length of the unfragmentable part for fragmentation. 308 */ 309 optlen = 0; 310 if (exthdrs.ip6e_hbh) 311 optlen += exthdrs.ip6e_hbh->m_len; 312 if (exthdrs.ip6e_dest1) 313 optlen += exthdrs.ip6e_dest1->m_len; 314 if (exthdrs.ip6e_rthdr) 315 optlen += exthdrs.ip6e_rthdr->m_len; 316 unfragpartlen = optlen + sizeof(struct ip6_hdr); 317 318 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 319 if (exthdrs.ip6e_dest2) 320 optlen += exthdrs.ip6e_dest2->m_len; 321 322 /* 323 * If there is at least one extension header, 324 * separate IP6 header from the payload. 325 */ 326 if (optlen && !hdrsplit) { 327 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 328 m = NULL; 329 goto freehdrs; 330 } 331 m = exthdrs.ip6e_ip6; 332 hdrsplit++; 333 } 334 335 /* adjust pointer */ 336 ip6 = mtod(m, struct ip6_hdr *); 337 338 /* adjust mbuf packet header length */ 339 m->m_pkthdr.len += optlen; 340 plen = m->m_pkthdr.len - sizeof(*ip6); 341 342 /* If this is a jumbo payload, insert a jumbo payload option. */ 343 if (plen > IPV6_MAXPACKET) { 344 if (!hdrsplit) { 345 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 346 m = NULL; 347 goto freehdrs; 348 } 349 m = exthdrs.ip6e_ip6; 350 hdrsplit++; 351 } 352 /* adjust pointer */ 353 ip6 = mtod(m, struct ip6_hdr *); 354 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 355 goto freehdrs; 356 ip6->ip6_plen = 0; 357 } else 358 ip6->ip6_plen = htons(plen); 359 360 /* 361 * Concatenate headers and fill in next header fields. 362 * Here we have, on "m" 363 * IPv6 payload 364 * and we insert headers accordingly. Finally, we should be getting: 365 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 366 * 367 * during the header composing process, "m" points to IPv6 header. 368 * "mprev" points to an extension header prior to esp. 369 */ 370 u_char *nexthdrp = &ip6->ip6_nxt; 371 mprev = m; 372 373 /* 374 * we treat dest2 specially. this makes IPsec processing 375 * much easier. the goal here is to make mprev point the 376 * mbuf prior to dest2. 377 * 378 * result: IPv6 dest2 payload 379 * m and mprev will point to IPv6 header. 380 */ 381 if (exthdrs.ip6e_dest2) { 382 if (!hdrsplit) 383 panic("assumption failed: hdr not split"); 384 exthdrs.ip6e_dest2->m_next = m->m_next; 385 m->m_next = exthdrs.ip6e_dest2; 386 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 387 ip6->ip6_nxt = IPPROTO_DSTOPTS; 388 } 389 390 /* 391 * result: IPv6 hbh dest1 rthdr dest2 payload 392 * m will point to IPv6 header. mprev will point to the 393 * extension header prior to dest2 (rthdr in the above case). 394 */ 395 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 396 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 397 IPPROTO_DSTOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 399 IPPROTO_ROUTING); 400 401 /* 402 * If there is a routing header, discard the packet. 403 */ 404 if (exthdrs.ip6e_rthdr) { 405 error = EINVAL; 406 goto bad; 407 } 408 409 /* Source address validation */ 410 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 411 (flags & IPV6_UNSPECSRC) == 0) { 412 error = EOPNOTSUPP; 413 IP6STAT_INC(ip6s_badscope); 414 goto bad; 415 } 416 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 417 error = EOPNOTSUPP; 418 IP6STAT_INC(ip6s_badscope); 419 goto bad; 420 } 421 422 IP6STAT_INC(ip6s_localout); 423 424 /* 425 * Route packet. 426 */ 427 if (ro == 0) { 428 ro = &ip6route; 429 bzero((caddr_t)ro, sizeof(*ro)); 430 } 431 ro_pmtu = ro; 432 if (opt && opt->ip6po_rthdr) 433 ro = &opt->ip6po_route; 434 dst = (struct sockaddr_in6 *)&ro->ro_dst; 435#ifdef FLOWTABLE 436 if (ro->ro_rt == NULL) 437 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 438#endif 439again: 440 /* 441 * if specified, try to fill in the traffic class field. 442 * do not override if a non-zero value is already set. 443 * we check the diffserv field and the ecn field separately. 444 */ 445 if (opt && opt->ip6po_tclass >= 0) { 446 int mask = 0; 447 448 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 449 mask |= 0xfc; 450 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 451 mask |= 0x03; 452 if (mask != 0) 453 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 454 } 455 456 /* fill in or override the hop limit field, if necessary. */ 457 if (opt && opt->ip6po_hlim != -1) 458 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 459 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 460 if (im6o != NULL) 461 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 462 else 463 ip6->ip6_hlim = V_ip6_defmcasthlim; 464 } 465 466 /* adjust pointer */ 467 ip6 = mtod(m, struct ip6_hdr *); 468 469 if (ro->ro_rt && fwd_tag == NULL) { 470 rt = ro->ro_rt; 471 ifp = ro->ro_rt->rt_ifp; 472 } else { 473 if (fwd_tag == NULL) { 474 bzero(&dst_sa, sizeof(dst_sa)); 475 dst_sa.sin6_family = AF_INET6; 476 dst_sa.sin6_len = sizeof(dst_sa); 477 dst_sa.sin6_addr = ip6->ip6_dst; 478 } 479 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 480 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 481 if (error != 0) { 482 if (ifp != NULL) 483 in6_ifstat_inc(ifp, ifs6_out_discard); 484 goto bad; 485 } 486 } 487 if (rt == NULL) { 488 /* 489 * If in6_selectroute() does not return a route entry, 490 * dst may not have been updated. 491 */ 492 *dst = dst_sa; /* XXX */ 493 } 494 495 /* 496 * then rt (for unicast) and ifp must be non-NULL valid values. 497 */ 498 if ((flags & IPV6_FORWARDING) == 0) { 499 /* XXX: the FORWARDING flag can be set for mrouting. */ 500 in6_ifstat_inc(ifp, ifs6_out_request); 501 } 502 if (rt != NULL) { 503 ia = (struct in6_ifaddr *)(rt->rt_ifa); 504 counter_u64_add(rt->rt_pksent, 1); 505 } 506 507 508 /* 509 * The outgoing interface must be in the zone of source and 510 * destination addresses. 511 */ 512 origifp = ifp; 513 514 src0 = ip6->ip6_src; 515 if (in6_setscope(&src0, origifp, &zone)) 516 goto badscope; 517 bzero(&src_sa, sizeof(src_sa)); 518 src_sa.sin6_family = AF_INET6; 519 src_sa.sin6_len = sizeof(src_sa); 520 src_sa.sin6_addr = ip6->ip6_src; 521 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 522 goto badscope; 523 524 dst0 = ip6->ip6_dst; 525 if (in6_setscope(&dst0, origifp, &zone)) 526 goto badscope; 527 /* re-initialize to be sure */ 528 bzero(&dst_sa, sizeof(dst_sa)); 529 dst_sa.sin6_family = AF_INET6; 530 dst_sa.sin6_len = sizeof(dst_sa); 531 dst_sa.sin6_addr = ip6->ip6_dst; 532 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 533 goto badscope; 534 } 535 536 /* We should use ia_ifp to support the case of 537 * sending packets to an address of our own. 538 */ 539 if (ia != NULL && ia->ia_ifp) 540 ifp = ia->ia_ifp; 541 542 /* scope check is done. */ 543 goto routefound; 544 545 badscope: 546 IP6STAT_INC(ip6s_badscope); 547 in6_ifstat_inc(origifp, ifs6_out_discard); 548 if (error == 0) 549 error = EHOSTUNREACH; /* XXX */ 550 goto bad; 551 552 routefound: 553 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 554 if (opt && opt->ip6po_nextroute.ro_rt) { 555 /* 556 * The nexthop is explicitly specified by the 557 * application. We assume the next hop is an IPv6 558 * address. 559 */ 560 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 561 } 562 else if ((rt->rt_flags & RTF_GATEWAY)) 563 dst = (struct sockaddr_in6 *)rt->rt_gateway; 564 } 565 566 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 567 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 568 } else { 569 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 570 in6_ifstat_inc(ifp, ifs6_out_mcast); 571 /* 572 * Confirm that the outgoing interface supports multicast. 573 */ 574 if (!(ifp->if_flags & IFF_MULTICAST)) { 575 IP6STAT_INC(ip6s_noroute); 576 in6_ifstat_inc(ifp, ifs6_out_discard); 577 error = ENETUNREACH; 578 goto bad; 579 } 580 if ((im6o == NULL && in6_mcast_loop) || 581 (im6o && im6o->im6o_multicast_loop)) { 582 /* 583 * Loop back multicast datagram if not expressly 584 * forbidden to do so, even if we have not joined 585 * the address; protocols will filter it later, 586 * thus deferring a hash lookup and lock acquisition 587 * at the expense of an m_copym(). 588 */ 589 ip6_mloopback(ifp, m, dst); 590 } else { 591 /* 592 * If we are acting as a multicast router, perform 593 * multicast forwarding as if the packet had just 594 * arrived on the interface to which we are about 595 * to send. The multicast forwarding function 596 * recursively calls this function, using the 597 * IPV6_FORWARDING flag to prevent infinite recursion. 598 * 599 * Multicasts that are looped back by ip6_mloopback(), 600 * above, will be forwarded by the ip6_input() routine, 601 * if necessary. 602 */ 603 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 604 /* 605 * XXX: ip6_mforward expects that rcvif is NULL 606 * when it is called from the originating path. 607 * However, it may not always be the case. 608 */ 609 m->m_pkthdr.rcvif = NULL; 610 if (ip6_mforward(ip6, ifp, m) != 0) { 611 m_freem(m); 612 goto done; 613 } 614 } 615 } 616 /* 617 * Multicasts with a hoplimit of zero may be looped back, 618 * above, but must not be transmitted on a network. 619 * Also, multicasts addressed to the loopback interface 620 * are not sent -- the above call to ip6_mloopback() will 621 * loop back a copy if this host actually belongs to the 622 * destination group on the loopback interface. 623 */ 624 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 625 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 626 m_freem(m); 627 goto done; 628 } 629 } 630 631 /* 632 * Fill the outgoing inteface to tell the upper layer 633 * to increment per-interface statistics. 634 */ 635 if (ifpp) 636 *ifpp = ifp; 637 638 /* Determine path MTU. */ 639 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 640 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 641 goto bad; 642 643 /* 644 * The caller of this function may specify to use the minimum MTU 645 * in some cases. 646 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 647 * setting. The logic is a bit complicated; by default, unicast 648 * packets will follow path MTU while multicast packets will be sent at 649 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 650 * including unicast ones will be sent at the minimum MTU. Multicast 651 * packets will always be sent at the minimum MTU unless 652 * IP6PO_MINMTU_DISABLE is explicitly specified. 653 * See RFC 3542 for more details. 654 */ 655 if (mtu > IPV6_MMTU) { 656 if ((flags & IPV6_MINMTU)) 657 mtu = IPV6_MMTU; 658 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 659 mtu = IPV6_MMTU; 660 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 661 (opt == NULL || 662 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 663 mtu = IPV6_MMTU; 664 } 665 } 666 667 /* 668 * clear embedded scope identifiers if necessary. 669 * in6_clearscope will touch the addresses only when necessary. 670 */ 671 in6_clearscope(&ip6->ip6_src); 672 in6_clearscope(&ip6->ip6_dst); 673 674 /* 675 * If the outgoing packet contains a hop-by-hop options header, 676 * it must be examined and processed even by the source node. 677 * (RFC 2460, section 4.) 678 */ 679 if (exthdrs.ip6e_hbh) { 680 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 681 u_int32_t dummy; /* XXX unused */ 682 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 683 684#ifdef DIAGNOSTIC 685 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 686 panic("ip6e_hbh is not contiguous"); 687#endif 688 /* 689 * XXX: if we have to send an ICMPv6 error to the sender, 690 * we need the M_LOOP flag since icmp6_error() expects 691 * the IPv6 and the hop-by-hop options header are 692 * contiguous unless the flag is set. 693 */ 694 m->m_flags |= M_LOOP; 695 m->m_pkthdr.rcvif = ifp; 696 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 697 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 698 &dummy, &plen) < 0) { 699 /* m was already freed at this point */ 700 error = EINVAL;/* better error? */ 701 goto done; 702 } 703 m->m_flags &= ~M_LOOP; /* XXX */ 704 m->m_pkthdr.rcvif = NULL; 705 } 706 707 /* Jump over all PFIL processing if hooks are not active. */ 708 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 709 goto passout; 710 711 odst = ip6->ip6_dst; 712 /* Run through list of hooks for output packets. */ 713 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 714 if (error != 0 || m == NULL) 715 goto done; 716 ip6 = mtod(m, struct ip6_hdr *); 717 718 /* See if destination IP address was changed by packet filter. */ 719 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 720 m->m_flags |= M_SKIP_FIREWALL; 721 /* If destination is now ourself drop to ip6_input(). */ 722 if (in6_localip(&ip6->ip6_dst)) { 723 m->m_flags |= M_FASTFWD_OURS; 724 if (m->m_pkthdr.rcvif == NULL) 725 m->m_pkthdr.rcvif = V_loif; 726 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 727 m->m_pkthdr.csum_flags |= 728 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 729 m->m_pkthdr.csum_data = 0xffff; 730 } 731#ifdef SCTP 732 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 733 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 734#endif 735 error = netisr_queue(NETISR_IPV6, m); 736 goto done; 737 } else 738 goto again; /* Redo the routing table lookup. */ 739 } 740 741 /* See if local, if yes, send it to netisr. */ 742 if (m->m_flags & M_FASTFWD_OURS) { 743 if (m->m_pkthdr.rcvif == NULL) 744 m->m_pkthdr.rcvif = V_loif; 745 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 746 m->m_pkthdr.csum_flags |= 747 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 748 m->m_pkthdr.csum_data = 0xffff; 749 } 750#ifdef SCTP 751 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 752 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 753#endif 754 error = netisr_queue(NETISR_IPV6, m); 755 goto done; 756 } 757 /* Or forward to some other address? */ 758 if ((m->m_flags & M_IP6_NEXTHOP) && 759 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 760 dst = (struct sockaddr_in6 *)&ro->ro_dst; 761 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 762 m->m_flags |= M_SKIP_FIREWALL; 763 m->m_flags &= ~M_IP6_NEXTHOP; 764 m_tag_delete(m, fwd_tag); 765 goto again; 766 } 767 768passout: 769 /* 770 * Send the packet to the outgoing interface. 771 * If necessary, do IPv6 fragmentation before sending. 772 * 773 * the logic here is rather complex: 774 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 775 * 1-a: send as is if tlen <= path mtu 776 * 1-b: fragment if tlen > path mtu 777 * 778 * 2: if user asks us not to fragment (dontfrag == 1) 779 * 2-a: send as is if tlen <= interface mtu 780 * 2-b: error if tlen > interface mtu 781 * 782 * 3: if we always need to attach fragment header (alwaysfrag == 1) 783 * always fragment 784 * 785 * 4: if dontfrag == 1 && alwaysfrag == 1 786 * error, as we cannot handle this conflicting request 787 */ 788 sw_csum = m->m_pkthdr.csum_flags; 789 if (!hdrsplit) { 790 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 791 sw_csum &= ~ifp->if_hwassist; 792 } else 793 tso = 0; 794 /* 795 * If we added extension headers, we will not do TSO and calculate the 796 * checksums ourselves for now. 797 * XXX-BZ Need a framework to know when the NIC can handle it, even 798 * with ext. hdrs. 799 */ 800 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 801 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 802 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 803 } 804#ifdef SCTP 805 if (sw_csum & CSUM_SCTP_IPV6) { 806 sw_csum &= ~CSUM_SCTP_IPV6; 807 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 808 } 809#endif 810 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 811 tlen = m->m_pkthdr.len; 812 813 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 814 dontfrag = 1; 815 else 816 dontfrag = 0; 817 if (dontfrag && alwaysfrag) { /* case 4 */ 818 /* conflicting request - can't transmit */ 819 error = EMSGSIZE; 820 goto bad; 821 } 822 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 823 /* 824 * Even if the DONTFRAG option is specified, we cannot send the 825 * packet when the data length is larger than the MTU of the 826 * outgoing interface. 827 * Notify the error by sending IPV6_PATHMTU ancillary data as 828 * well as returning an error code (the latter is not described 829 * in the API spec.) 830 */ 831 u_int32_t mtu32; 832 struct ip6ctlparam ip6cp; 833 834 mtu32 = (u_int32_t)mtu; 835 bzero(&ip6cp, sizeof(ip6cp)); 836 ip6cp.ip6c_cmdarg = (void *)&mtu32; 837 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 838 (void *)&ip6cp); 839 840 error = EMSGSIZE; 841 goto bad; 842 } 843 844 /* 845 * transmit packet without fragmentation 846 */ 847 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 848 struct in6_ifaddr *ia6; 849 850 ip6 = mtod(m, struct ip6_hdr *); 851 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 852 if (ia6) { 853 /* Record statistics for this interface address. */ 854 ia6->ia_ifa.if_opackets++; 855 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 856 ifa_free(&ia6->ia_ifa); 857 } 858 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 859 goto done; 860 } 861 862 /* 863 * try to fragment the packet. case 1-b and 3 864 */ 865 if (mtu < IPV6_MMTU) { 866 /* path MTU cannot be less than IPV6_MMTU */ 867 error = EMSGSIZE; 868 in6_ifstat_inc(ifp, ifs6_out_fragfail); 869 goto bad; 870 } else if (ip6->ip6_plen == 0) { 871 /* jumbo payload cannot be fragmented */ 872 error = EMSGSIZE; 873 in6_ifstat_inc(ifp, ifs6_out_fragfail); 874 goto bad; 875 } else { 876 struct mbuf **mnext, *m_frgpart; 877 struct ip6_frag *ip6f; 878 u_int32_t id = htonl(ip6_randomid()); 879 u_char nextproto; 880 881 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 882 883 /* 884 * Too large for the destination or interface; 885 * fragment if possible. 886 * Must be able to put at least 8 bytes per fragment. 887 */ 888 hlen = unfragpartlen; 889 if (mtu > IPV6_MAXPACKET) 890 mtu = IPV6_MAXPACKET; 891 892 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 893 if (len < 8) { 894 error = EMSGSIZE; 895 in6_ifstat_inc(ifp, ifs6_out_fragfail); 896 goto bad; 897 } 898 899 /* 900 * Verify that we have any chance at all of being able to queue 901 * the packet or packet fragments 902 */ 903 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 904 < tlen /* - hlen */)) { 905 error = ENOBUFS; 906 IP6STAT_INC(ip6s_odropped); 907 goto bad; 908 } 909 910 911 /* 912 * If the interface will not calculate checksums on 913 * fragmented packets, then do it here. 914 * XXX-BZ handle the hw offloading case. Need flags. 915 */ 916 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 917 in6_delayed_cksum(m, plen, hlen); 918 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 919 } 920#ifdef SCTP 921 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 922 sctp_delayed_cksum(m, hlen); 923 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 924 } 925#endif 926 mnext = &m->m_nextpkt; 927 928 /* 929 * Change the next header field of the last header in the 930 * unfragmentable part. 931 */ 932 if (exthdrs.ip6e_rthdr) { 933 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 934 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 935 } else if (exthdrs.ip6e_dest1) { 936 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 937 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 938 } else if (exthdrs.ip6e_hbh) { 939 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 940 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 941 } else { 942 nextproto = ip6->ip6_nxt; 943 ip6->ip6_nxt = IPPROTO_FRAGMENT; 944 } 945 946 /* 947 * Loop through length of segment after first fragment, 948 * make new header and copy data of each part and link onto 949 * chain. 950 */ 951 m0 = m; 952 for (off = hlen; off < tlen; off += len) { 953 m = m_gethdr(M_NOWAIT, MT_DATA); 954 if (!m) { 955 error = ENOBUFS; 956 IP6STAT_INC(ip6s_odropped); 957 goto sendorfree; 958 } 959 m->m_flags = m0->m_flags & M_COPYFLAGS; 960 *mnext = m; 961 mnext = &m->m_nextpkt; 962 m->m_data += max_linkhdr; 963 mhip6 = mtod(m, struct ip6_hdr *); 964 *mhip6 = *ip6; 965 m->m_len = sizeof(*mhip6); 966 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 967 if (error) { 968 IP6STAT_INC(ip6s_odropped); 969 goto sendorfree; 970 } 971 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 972 if (off + len >= tlen) 973 len = tlen - off; 974 else 975 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 976 mhip6->ip6_plen = htons((u_short)(len + hlen + 977 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 978 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 979 error = ENOBUFS; 980 IP6STAT_INC(ip6s_odropped); 981 goto sendorfree; 982 } 983 m_cat(m, m_frgpart); 984 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 985 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 986 m->m_pkthdr.rcvif = NULL; 987 ip6f->ip6f_reserved = 0; 988 ip6f->ip6f_ident = id; 989 ip6f->ip6f_nxt = nextproto; 990 IP6STAT_INC(ip6s_ofragments); 991 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 992 } 993 994 in6_ifstat_inc(ifp, ifs6_out_fragok); 995 } 996 997 /* 998 * Remove leading garbages. 999 */ 1000sendorfree: 1001 m = m0->m_nextpkt; 1002 m0->m_nextpkt = 0; 1003 m_freem(m0); 1004 for (m0 = m; m; m = m0) { 1005 m0 = m->m_nextpkt; 1006 m->m_nextpkt = 0; 1007 if (error == 0) { 1008 /* Record statistics for this interface address. */ 1009 if (ia) { 1010 ia->ia_ifa.if_opackets++; 1011 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1012 } 1013 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1014 } else 1015 m_freem(m); 1016 } 1017 1018 if (error == 0) 1019 IP6STAT_INC(ip6s_fragmented); 1020 1021done: 1022 if (ro == &ip6route) 1023 RO_RTFREE(ro); 1024 if (ro_pmtu == &ip6route) 1025 RO_RTFREE(ro_pmtu); 1026 return (error); 1027 1028freehdrs: 1029 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1030 m_freem(exthdrs.ip6e_dest1); 1031 m_freem(exthdrs.ip6e_rthdr); 1032 m_freem(exthdrs.ip6e_dest2); 1033 /* FALLTHROUGH */ 1034bad: 1035 if (m) 1036 m_freem(m); 1037 goto done; 1038} 1039 1040static int 1041ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1042{ 1043 struct mbuf *m; 1044 1045 if (hlen > MCLBYTES) 1046 return (ENOBUFS); /* XXX */ 1047 1048 if (hlen > MLEN) 1049 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1050 else 1051 m = m_get(M_NOWAIT, MT_DATA); 1052 if (m == NULL) 1053 return (ENOBUFS); 1054 m->m_len = hlen; 1055 if (hdr) 1056 bcopy(hdr, mtod(m, caddr_t), hlen); 1057 1058 *mp = m; 1059 return (0); 1060} 1061 1062/* 1063 * Insert jumbo payload option. 1064 */ 1065static int 1066ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1067{ 1068 struct mbuf *mopt; 1069 u_char *optbuf; 1070 u_int32_t v; 1071 1072#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1073 1074 /* 1075 * If there is no hop-by-hop options header, allocate new one. 1076 * If there is one but it doesn't have enough space to store the 1077 * jumbo payload option, allocate a cluster to store the whole options. 1078 * Otherwise, use it to store the options. 1079 */ 1080 if (exthdrs->ip6e_hbh == 0) { 1081 mopt = m_get(M_NOWAIT, MT_DATA); 1082 if (mopt == NULL) 1083 return (ENOBUFS); 1084 mopt->m_len = JUMBOOPTLEN; 1085 optbuf = mtod(mopt, u_char *); 1086 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1087 exthdrs->ip6e_hbh = mopt; 1088 } else { 1089 struct ip6_hbh *hbh; 1090 1091 mopt = exthdrs->ip6e_hbh; 1092 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1093 /* 1094 * XXX assumption: 1095 * - exthdrs->ip6e_hbh is not referenced from places 1096 * other than exthdrs. 1097 * - exthdrs->ip6e_hbh is not an mbuf chain. 1098 */ 1099 int oldoptlen = mopt->m_len; 1100 struct mbuf *n; 1101 1102 /* 1103 * XXX: give up if the whole (new) hbh header does 1104 * not fit even in an mbuf cluster. 1105 */ 1106 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1107 return (ENOBUFS); 1108 1109 /* 1110 * As a consequence, we must always prepare a cluster 1111 * at this point. 1112 */ 1113 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1114 if (n == NULL) 1115 return (ENOBUFS); 1116 n->m_len = oldoptlen + JUMBOOPTLEN; 1117 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1118 oldoptlen); 1119 optbuf = mtod(n, caddr_t) + oldoptlen; 1120 m_freem(mopt); 1121 mopt = exthdrs->ip6e_hbh = n; 1122 } else { 1123 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1124 mopt->m_len += JUMBOOPTLEN; 1125 } 1126 optbuf[0] = IP6OPT_PADN; 1127 optbuf[1] = 1; 1128 1129 /* 1130 * Adjust the header length according to the pad and 1131 * the jumbo payload option. 1132 */ 1133 hbh = mtod(mopt, struct ip6_hbh *); 1134 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1135 } 1136 1137 /* fill in the option. */ 1138 optbuf[2] = IP6OPT_JUMBO; 1139 optbuf[3] = 4; 1140 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1141 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1142 1143 /* finally, adjust the packet header length */ 1144 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1145 1146 return (0); 1147#undef JUMBOOPTLEN 1148} 1149 1150/* 1151 * Insert fragment header and copy unfragmentable header portions. 1152 */ 1153static int 1154ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1155 struct ip6_frag **frghdrp) 1156{ 1157 struct mbuf *n, *mlast; 1158 1159 if (hlen > sizeof(struct ip6_hdr)) { 1160 n = m_copym(m0, sizeof(struct ip6_hdr), 1161 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1162 if (n == 0) 1163 return (ENOBUFS); 1164 m->m_next = n; 1165 } else 1166 n = m; 1167 1168 /* Search for the last mbuf of unfragmentable part. */ 1169 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1170 ; 1171 1172 if ((mlast->m_flags & M_EXT) == 0 && 1173 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1174 /* use the trailing space of the last mbuf for the fragment hdr */ 1175 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1176 mlast->m_len); 1177 mlast->m_len += sizeof(struct ip6_frag); 1178 m->m_pkthdr.len += sizeof(struct ip6_frag); 1179 } else { 1180 /* allocate a new mbuf for the fragment header */ 1181 struct mbuf *mfrg; 1182 1183 mfrg = m_get(M_NOWAIT, MT_DATA); 1184 if (mfrg == NULL) 1185 return (ENOBUFS); 1186 mfrg->m_len = sizeof(struct ip6_frag); 1187 *frghdrp = mtod(mfrg, struct ip6_frag *); 1188 mlast->m_next = mfrg; 1189 } 1190 1191 return (0); 1192} 1193 1194static int 1195ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1196 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1197 int *alwaysfragp, u_int fibnum) 1198{ 1199 u_int32_t mtu = 0; 1200 int alwaysfrag = 0; 1201 int error = 0; 1202 1203 if (ro_pmtu != ro) { 1204 /* The first hop and the final destination may differ. */ 1205 struct sockaddr_in6 *sa6_dst = 1206 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1207 if (ro_pmtu->ro_rt && 1208 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1209 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1210 RTFREE(ro_pmtu->ro_rt); 1211 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1212 } 1213 if (ro_pmtu->ro_rt == NULL) { 1214 bzero(sa6_dst, sizeof(*sa6_dst)); 1215 sa6_dst->sin6_family = AF_INET6; 1216 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1217 sa6_dst->sin6_addr = *dst; 1218 1219 in6_rtalloc(ro_pmtu, fibnum); 1220 } 1221 } 1222 if (ro_pmtu->ro_rt) { 1223 u_int32_t ifmtu; 1224 struct in_conninfo inc; 1225 1226 bzero(&inc, sizeof(inc)); 1227 inc.inc_flags |= INC_ISIPV6; 1228 inc.inc6_faddr = *dst; 1229 1230 if (ifp == NULL) 1231 ifp = ro_pmtu->ro_rt->rt_ifp; 1232 ifmtu = IN6_LINKMTU(ifp); 1233 mtu = tcp_hc_getmtu(&inc); 1234 if (mtu) 1235 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu); 1236 else 1237 mtu = ro_pmtu->ro_rt->rt_mtu; 1238 if (mtu == 0) 1239 mtu = ifmtu; 1240 else if (mtu < IPV6_MMTU) { 1241 /* 1242 * RFC2460 section 5, last paragraph: 1243 * if we record ICMPv6 too big message with 1244 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1245 * or smaller, with framgent header attached. 1246 * (fragment header is needed regardless from the 1247 * packet size, for translators to identify packets) 1248 */ 1249 alwaysfrag = 1; 1250 mtu = IPV6_MMTU; 1251 } else if (mtu > ifmtu) { 1252 /* 1253 * The MTU on the route is larger than the MTU on 1254 * the interface! This shouldn't happen, unless the 1255 * MTU of the interface has been changed after the 1256 * interface was brought up. Change the MTU in the 1257 * route to match the interface MTU (as long as the 1258 * field isn't locked). 1259 */ 1260 mtu = ifmtu; 1261 ro_pmtu->ro_rt->rt_mtu = mtu; 1262 } 1263 } else if (ifp) { 1264 mtu = IN6_LINKMTU(ifp); 1265 } else 1266 error = EHOSTUNREACH; /* XXX */ 1267 1268 *mtup = mtu; 1269 if (alwaysfragp) 1270 *alwaysfragp = alwaysfrag; 1271 return (error); 1272} 1273 1274/* 1275 * IP6 socket option processing. 1276 */ 1277int 1278ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1279{ 1280 int optdatalen, uproto; 1281 void *optdata; 1282 struct inpcb *in6p = sotoinpcb(so); 1283 int error, optval; 1284 int level, op, optname; 1285 int optlen; 1286 struct thread *td; 1287 1288 level = sopt->sopt_level; 1289 op = sopt->sopt_dir; 1290 optname = sopt->sopt_name; 1291 optlen = sopt->sopt_valsize; 1292 td = sopt->sopt_td; 1293 error = 0; 1294 optval = 0; 1295 uproto = (int)so->so_proto->pr_protocol; 1296 1297 if (level != IPPROTO_IPV6) { 1298 error = EINVAL; 1299 1300 if (sopt->sopt_level == SOL_SOCKET && 1301 sopt->sopt_dir == SOPT_SET) { 1302 switch (sopt->sopt_name) { 1303 case SO_REUSEADDR: 1304 INP_WLOCK(in6p); 1305 if ((so->so_options & SO_REUSEADDR) != 0) 1306 in6p->inp_flags2 |= INP_REUSEADDR; 1307 else 1308 in6p->inp_flags2 &= ~INP_REUSEADDR; 1309 INP_WUNLOCK(in6p); 1310 error = 0; 1311 break; 1312 case SO_REUSEPORT: 1313 INP_WLOCK(in6p); 1314 if ((so->so_options & SO_REUSEPORT) != 0) 1315 in6p->inp_flags2 |= INP_REUSEPORT; 1316 else 1317 in6p->inp_flags2 &= ~INP_REUSEPORT; 1318 INP_WUNLOCK(in6p); 1319 error = 0; 1320 break; 1321 case SO_SETFIB: 1322 INP_WLOCK(in6p); 1323 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1324 INP_WUNLOCK(in6p); 1325 error = 0; 1326 break; 1327 default: 1328 break; 1329 } 1330 } 1331 } else { /* level == IPPROTO_IPV6 */ 1332 switch (op) { 1333 1334 case SOPT_SET: 1335 switch (optname) { 1336 case IPV6_2292PKTOPTIONS: 1337#ifdef IPV6_PKTOPTIONS 1338 case IPV6_PKTOPTIONS: 1339#endif 1340 { 1341 struct mbuf *m; 1342 1343 error = soopt_getm(sopt, &m); /* XXX */ 1344 if (error != 0) 1345 break; 1346 error = soopt_mcopyin(sopt, m); /* XXX */ 1347 if (error != 0) 1348 break; 1349 error = ip6_pcbopts(&in6p->in6p_outputopts, 1350 m, so, sopt); 1351 m_freem(m); /* XXX */ 1352 break; 1353 } 1354 1355 /* 1356 * Use of some Hop-by-Hop options or some 1357 * Destination options, might require special 1358 * privilege. That is, normal applications 1359 * (without special privilege) might be forbidden 1360 * from setting certain options in outgoing packets, 1361 * and might never see certain options in received 1362 * packets. [RFC 2292 Section 6] 1363 * KAME specific note: 1364 * KAME prevents non-privileged users from sending or 1365 * receiving ANY hbh/dst options in order to avoid 1366 * overhead of parsing options in the kernel. 1367 */ 1368 case IPV6_RECVHOPOPTS: 1369 case IPV6_RECVDSTOPTS: 1370 case IPV6_RECVRTHDRDSTOPTS: 1371 if (td != NULL) { 1372 error = priv_check(td, 1373 PRIV_NETINET_SETHDROPTS); 1374 if (error) 1375 break; 1376 } 1377 /* FALLTHROUGH */ 1378 case IPV6_UNICAST_HOPS: 1379 case IPV6_HOPLIMIT: 1380 case IPV6_FAITH: 1381 1382 case IPV6_RECVPKTINFO: 1383 case IPV6_RECVHOPLIMIT: 1384 case IPV6_RECVRTHDR: 1385 case IPV6_RECVPATHMTU: 1386 case IPV6_RECVTCLASS: 1387 case IPV6_V6ONLY: 1388 case IPV6_AUTOFLOWLABEL: 1389 case IPV6_BINDANY: 1390 if (optname == IPV6_BINDANY && td != NULL) { 1391 error = priv_check(td, 1392 PRIV_NETINET_BINDANY); 1393 if (error) 1394 break; 1395 } 1396 1397 if (optlen != sizeof(int)) { 1398 error = EINVAL; 1399 break; 1400 } 1401 error = sooptcopyin(sopt, &optval, 1402 sizeof optval, sizeof optval); 1403 if (error) 1404 break; 1405 switch (optname) { 1406 1407 case IPV6_UNICAST_HOPS: 1408 if (optval < -1 || optval >= 256) 1409 error = EINVAL; 1410 else { 1411 /* -1 = kernel default */ 1412 in6p->in6p_hops = optval; 1413 if ((in6p->inp_vflag & 1414 INP_IPV4) != 0) 1415 in6p->inp_ip_ttl = optval; 1416 } 1417 break; 1418#define OPTSET(bit) \ 1419do { \ 1420 INP_WLOCK(in6p); \ 1421 if (optval) \ 1422 in6p->inp_flags |= (bit); \ 1423 else \ 1424 in6p->inp_flags &= ~(bit); \ 1425 INP_WUNLOCK(in6p); \ 1426} while (/*CONSTCOND*/ 0) 1427#define OPTSET2292(bit) \ 1428do { \ 1429 INP_WLOCK(in6p); \ 1430 in6p->inp_flags |= IN6P_RFC2292; \ 1431 if (optval) \ 1432 in6p->inp_flags |= (bit); \ 1433 else \ 1434 in6p->inp_flags &= ~(bit); \ 1435 INP_WUNLOCK(in6p); \ 1436} while (/*CONSTCOND*/ 0) 1437#define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1438 1439 case IPV6_RECVPKTINFO: 1440 /* cannot mix with RFC2292 */ 1441 if (OPTBIT(IN6P_RFC2292)) { 1442 error = EINVAL; 1443 break; 1444 } 1445 OPTSET(IN6P_PKTINFO); 1446 break; 1447 1448 case IPV6_HOPLIMIT: 1449 { 1450 struct ip6_pktopts **optp; 1451 1452 /* cannot mix with RFC2292 */ 1453 if (OPTBIT(IN6P_RFC2292)) { 1454 error = EINVAL; 1455 break; 1456 } 1457 optp = &in6p->in6p_outputopts; 1458 error = ip6_pcbopt(IPV6_HOPLIMIT, 1459 (u_char *)&optval, sizeof(optval), 1460 optp, (td != NULL) ? td->td_ucred : 1461 NULL, uproto); 1462 break; 1463 } 1464 1465 case IPV6_RECVHOPLIMIT: 1466 /* cannot mix with RFC2292 */ 1467 if (OPTBIT(IN6P_RFC2292)) { 1468 error = EINVAL; 1469 break; 1470 } 1471 OPTSET(IN6P_HOPLIMIT); 1472 break; 1473 1474 case IPV6_RECVHOPOPTS: 1475 /* cannot mix with RFC2292 */ 1476 if (OPTBIT(IN6P_RFC2292)) { 1477 error = EINVAL; 1478 break; 1479 } 1480 OPTSET(IN6P_HOPOPTS); 1481 break; 1482 1483 case IPV6_RECVDSTOPTS: 1484 /* cannot mix with RFC2292 */ 1485 if (OPTBIT(IN6P_RFC2292)) { 1486 error = EINVAL; 1487 break; 1488 } 1489 OPTSET(IN6P_DSTOPTS); 1490 break; 1491 1492 case IPV6_RECVRTHDRDSTOPTS: 1493 /* cannot mix with RFC2292 */ 1494 if (OPTBIT(IN6P_RFC2292)) { 1495 error = EINVAL; 1496 break; 1497 } 1498 OPTSET(IN6P_RTHDRDSTOPTS); 1499 break; 1500 1501 case IPV6_RECVRTHDR: 1502 /* cannot mix with RFC2292 */ 1503 if (OPTBIT(IN6P_RFC2292)) { 1504 error = EINVAL; 1505 break; 1506 } 1507 OPTSET(IN6P_RTHDR); 1508 break; 1509 1510 case IPV6_FAITH: 1511 OPTSET(INP_FAITH); 1512 break; 1513 1514 case IPV6_RECVPATHMTU: 1515 /* 1516 * We ignore this option for TCP 1517 * sockets. 1518 * (RFC3542 leaves this case 1519 * unspecified.) 1520 */ 1521 if (uproto != IPPROTO_TCP) 1522 OPTSET(IN6P_MTU); 1523 break; 1524 1525 case IPV6_V6ONLY: 1526 /* 1527 * make setsockopt(IPV6_V6ONLY) 1528 * available only prior to bind(2). 1529 * see ipng mailing list, Jun 22 2001. 1530 */ 1531 if (in6p->inp_lport || 1532 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1533 error = EINVAL; 1534 break; 1535 } 1536 OPTSET(IN6P_IPV6_V6ONLY); 1537 if (optval) 1538 in6p->inp_vflag &= ~INP_IPV4; 1539 else 1540 in6p->inp_vflag |= INP_IPV4; 1541 break; 1542 case IPV6_RECVTCLASS: 1543 /* cannot mix with RFC2292 XXX */ 1544 if (OPTBIT(IN6P_RFC2292)) { 1545 error = EINVAL; 1546 break; 1547 } 1548 OPTSET(IN6P_TCLASS); 1549 break; 1550 case IPV6_AUTOFLOWLABEL: 1551 OPTSET(IN6P_AUTOFLOWLABEL); 1552 break; 1553 1554 case IPV6_BINDANY: 1555 OPTSET(INP_BINDANY); 1556 break; 1557 } 1558 break; 1559 1560 case IPV6_TCLASS: 1561 case IPV6_DONTFRAG: 1562 case IPV6_USE_MIN_MTU: 1563 case IPV6_PREFER_TEMPADDR: 1564 if (optlen != sizeof(optval)) { 1565 error = EINVAL; 1566 break; 1567 } 1568 error = sooptcopyin(sopt, &optval, 1569 sizeof optval, sizeof optval); 1570 if (error) 1571 break; 1572 { 1573 struct ip6_pktopts **optp; 1574 optp = &in6p->in6p_outputopts; 1575 error = ip6_pcbopt(optname, 1576 (u_char *)&optval, sizeof(optval), 1577 optp, (td != NULL) ? td->td_ucred : 1578 NULL, uproto); 1579 break; 1580 } 1581 1582 case IPV6_2292PKTINFO: 1583 case IPV6_2292HOPLIMIT: 1584 case IPV6_2292HOPOPTS: 1585 case IPV6_2292DSTOPTS: 1586 case IPV6_2292RTHDR: 1587 /* RFC 2292 */ 1588 if (optlen != sizeof(int)) { 1589 error = EINVAL; 1590 break; 1591 } 1592 error = sooptcopyin(sopt, &optval, 1593 sizeof optval, sizeof optval); 1594 if (error) 1595 break; 1596 switch (optname) { 1597 case IPV6_2292PKTINFO: 1598 OPTSET2292(IN6P_PKTINFO); 1599 break; 1600 case IPV6_2292HOPLIMIT: 1601 OPTSET2292(IN6P_HOPLIMIT); 1602 break; 1603 case IPV6_2292HOPOPTS: 1604 /* 1605 * Check super-user privilege. 1606 * See comments for IPV6_RECVHOPOPTS. 1607 */ 1608 if (td != NULL) { 1609 error = priv_check(td, 1610 PRIV_NETINET_SETHDROPTS); 1611 if (error) 1612 return (error); 1613 } 1614 OPTSET2292(IN6P_HOPOPTS); 1615 break; 1616 case IPV6_2292DSTOPTS: 1617 if (td != NULL) { 1618 error = priv_check(td, 1619 PRIV_NETINET_SETHDROPTS); 1620 if (error) 1621 return (error); 1622 } 1623 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1624 break; 1625 case IPV6_2292RTHDR: 1626 OPTSET2292(IN6P_RTHDR); 1627 break; 1628 } 1629 break; 1630 case IPV6_PKTINFO: 1631 case IPV6_HOPOPTS: 1632 case IPV6_RTHDR: 1633 case IPV6_DSTOPTS: 1634 case IPV6_RTHDRDSTOPTS: 1635 case IPV6_NEXTHOP: 1636 { 1637 /* new advanced API (RFC3542) */ 1638 u_char *optbuf; 1639 u_char optbuf_storage[MCLBYTES]; 1640 int optlen; 1641 struct ip6_pktopts **optp; 1642 1643 /* cannot mix with RFC2292 */ 1644 if (OPTBIT(IN6P_RFC2292)) { 1645 error = EINVAL; 1646 break; 1647 } 1648 1649 /* 1650 * We only ensure valsize is not too large 1651 * here. Further validation will be done 1652 * later. 1653 */ 1654 error = sooptcopyin(sopt, optbuf_storage, 1655 sizeof(optbuf_storage), 0); 1656 if (error) 1657 break; 1658 optlen = sopt->sopt_valsize; 1659 optbuf = optbuf_storage; 1660 optp = &in6p->in6p_outputopts; 1661 error = ip6_pcbopt(optname, optbuf, optlen, 1662 optp, (td != NULL) ? td->td_ucred : NULL, 1663 uproto); 1664 break; 1665 } 1666#undef OPTSET 1667 1668 case IPV6_MULTICAST_IF: 1669 case IPV6_MULTICAST_HOPS: 1670 case IPV6_MULTICAST_LOOP: 1671 case IPV6_JOIN_GROUP: 1672 case IPV6_LEAVE_GROUP: 1673 case IPV6_MSFILTER: 1674 case MCAST_BLOCK_SOURCE: 1675 case MCAST_UNBLOCK_SOURCE: 1676 case MCAST_JOIN_GROUP: 1677 case MCAST_LEAVE_GROUP: 1678 case MCAST_JOIN_SOURCE_GROUP: 1679 case MCAST_LEAVE_SOURCE_GROUP: 1680 error = ip6_setmoptions(in6p, sopt); 1681 break; 1682 1683 case IPV6_PORTRANGE: 1684 error = sooptcopyin(sopt, &optval, 1685 sizeof optval, sizeof optval); 1686 if (error) 1687 break; 1688 1689 INP_WLOCK(in6p); 1690 switch (optval) { 1691 case IPV6_PORTRANGE_DEFAULT: 1692 in6p->inp_flags &= ~(INP_LOWPORT); 1693 in6p->inp_flags &= ~(INP_HIGHPORT); 1694 break; 1695 1696 case IPV6_PORTRANGE_HIGH: 1697 in6p->inp_flags &= ~(INP_LOWPORT); 1698 in6p->inp_flags |= INP_HIGHPORT; 1699 break; 1700 1701 case IPV6_PORTRANGE_LOW: 1702 in6p->inp_flags &= ~(INP_HIGHPORT); 1703 in6p->inp_flags |= INP_LOWPORT; 1704 break; 1705 1706 default: 1707 error = EINVAL; 1708 break; 1709 } 1710 INP_WUNLOCK(in6p); 1711 break; 1712 1713#ifdef IPSEC 1714 case IPV6_IPSEC_POLICY: 1715 { 1716 caddr_t req; 1717 struct mbuf *m; 1718 1719 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1720 break; 1721 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1722 break; 1723 req = mtod(m, caddr_t); 1724 error = ipsec_set_policy(in6p, optname, req, 1725 m->m_len, (sopt->sopt_td != NULL) ? 1726 sopt->sopt_td->td_ucred : NULL); 1727 m_freem(m); 1728 break; 1729 } 1730#endif /* IPSEC */ 1731 1732 default: 1733 error = ENOPROTOOPT; 1734 break; 1735 } 1736 break; 1737 1738 case SOPT_GET: 1739 switch (optname) { 1740 1741 case IPV6_2292PKTOPTIONS: 1742#ifdef IPV6_PKTOPTIONS 1743 case IPV6_PKTOPTIONS: 1744#endif 1745 /* 1746 * RFC3542 (effectively) deprecated the 1747 * semantics of the 2292-style pktoptions. 1748 * Since it was not reliable in nature (i.e., 1749 * applications had to expect the lack of some 1750 * information after all), it would make sense 1751 * to simplify this part by always returning 1752 * empty data. 1753 */ 1754 sopt->sopt_valsize = 0; 1755 break; 1756 1757 case IPV6_RECVHOPOPTS: 1758 case IPV6_RECVDSTOPTS: 1759 case IPV6_RECVRTHDRDSTOPTS: 1760 case IPV6_UNICAST_HOPS: 1761 case IPV6_RECVPKTINFO: 1762 case IPV6_RECVHOPLIMIT: 1763 case IPV6_RECVRTHDR: 1764 case IPV6_RECVPATHMTU: 1765 1766 case IPV6_FAITH: 1767 case IPV6_V6ONLY: 1768 case IPV6_PORTRANGE: 1769 case IPV6_RECVTCLASS: 1770 case IPV6_AUTOFLOWLABEL: 1771 case IPV6_BINDANY: 1772 switch (optname) { 1773 1774 case IPV6_RECVHOPOPTS: 1775 optval = OPTBIT(IN6P_HOPOPTS); 1776 break; 1777 1778 case IPV6_RECVDSTOPTS: 1779 optval = OPTBIT(IN6P_DSTOPTS); 1780 break; 1781 1782 case IPV6_RECVRTHDRDSTOPTS: 1783 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1784 break; 1785 1786 case IPV6_UNICAST_HOPS: 1787 optval = in6p->in6p_hops; 1788 break; 1789 1790 case IPV6_RECVPKTINFO: 1791 optval = OPTBIT(IN6P_PKTINFO); 1792 break; 1793 1794 case IPV6_RECVHOPLIMIT: 1795 optval = OPTBIT(IN6P_HOPLIMIT); 1796 break; 1797 1798 case IPV6_RECVRTHDR: 1799 optval = OPTBIT(IN6P_RTHDR); 1800 break; 1801 1802 case IPV6_RECVPATHMTU: 1803 optval = OPTBIT(IN6P_MTU); 1804 break; 1805 1806 case IPV6_FAITH: 1807 optval = OPTBIT(INP_FAITH); 1808 break; 1809 1810 case IPV6_V6ONLY: 1811 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1812 break; 1813 1814 case IPV6_PORTRANGE: 1815 { 1816 int flags; 1817 flags = in6p->inp_flags; 1818 if (flags & INP_HIGHPORT) 1819 optval = IPV6_PORTRANGE_HIGH; 1820 else if (flags & INP_LOWPORT) 1821 optval = IPV6_PORTRANGE_LOW; 1822 else 1823 optval = 0; 1824 break; 1825 } 1826 case IPV6_RECVTCLASS: 1827 optval = OPTBIT(IN6P_TCLASS); 1828 break; 1829 1830 case IPV6_AUTOFLOWLABEL: 1831 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1832 break; 1833 1834 case IPV6_BINDANY: 1835 optval = OPTBIT(INP_BINDANY); 1836 break; 1837 } 1838 if (error) 1839 break; 1840 error = sooptcopyout(sopt, &optval, 1841 sizeof optval); 1842 break; 1843 1844 case IPV6_PATHMTU: 1845 { 1846 u_long pmtu = 0; 1847 struct ip6_mtuinfo mtuinfo; 1848 struct route_in6 sro; 1849 1850 bzero(&sro, sizeof(sro)); 1851 1852 if (!(so->so_state & SS_ISCONNECTED)) 1853 return (ENOTCONN); 1854 /* 1855 * XXX: we dot not consider the case of source 1856 * routing, or optional information to specify 1857 * the outgoing interface. 1858 */ 1859 error = ip6_getpmtu(&sro, NULL, NULL, 1860 &in6p->in6p_faddr, &pmtu, NULL, 1861 so->so_fibnum); 1862 if (sro.ro_rt) 1863 RTFREE(sro.ro_rt); 1864 if (error) 1865 break; 1866 if (pmtu > IPV6_MAXPACKET) 1867 pmtu = IPV6_MAXPACKET; 1868 1869 bzero(&mtuinfo, sizeof(mtuinfo)); 1870 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1871 optdata = (void *)&mtuinfo; 1872 optdatalen = sizeof(mtuinfo); 1873 error = sooptcopyout(sopt, optdata, 1874 optdatalen); 1875 break; 1876 } 1877 1878 case IPV6_2292PKTINFO: 1879 case IPV6_2292HOPLIMIT: 1880 case IPV6_2292HOPOPTS: 1881 case IPV6_2292RTHDR: 1882 case IPV6_2292DSTOPTS: 1883 switch (optname) { 1884 case IPV6_2292PKTINFO: 1885 optval = OPTBIT(IN6P_PKTINFO); 1886 break; 1887 case IPV6_2292HOPLIMIT: 1888 optval = OPTBIT(IN6P_HOPLIMIT); 1889 break; 1890 case IPV6_2292HOPOPTS: 1891 optval = OPTBIT(IN6P_HOPOPTS); 1892 break; 1893 case IPV6_2292RTHDR: 1894 optval = OPTBIT(IN6P_RTHDR); 1895 break; 1896 case IPV6_2292DSTOPTS: 1897 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1898 break; 1899 } 1900 error = sooptcopyout(sopt, &optval, 1901 sizeof optval); 1902 break; 1903 case IPV6_PKTINFO: 1904 case IPV6_HOPOPTS: 1905 case IPV6_RTHDR: 1906 case IPV6_DSTOPTS: 1907 case IPV6_RTHDRDSTOPTS: 1908 case IPV6_NEXTHOP: 1909 case IPV6_TCLASS: 1910 case IPV6_DONTFRAG: 1911 case IPV6_USE_MIN_MTU: 1912 case IPV6_PREFER_TEMPADDR: 1913 error = ip6_getpcbopt(in6p->in6p_outputopts, 1914 optname, sopt); 1915 break; 1916 1917 case IPV6_MULTICAST_IF: 1918 case IPV6_MULTICAST_HOPS: 1919 case IPV6_MULTICAST_LOOP: 1920 case IPV6_MSFILTER: 1921 error = ip6_getmoptions(in6p, sopt); 1922 break; 1923 1924#ifdef IPSEC 1925 case IPV6_IPSEC_POLICY: 1926 { 1927 caddr_t req = NULL; 1928 size_t len = 0; 1929 struct mbuf *m = NULL; 1930 struct mbuf **mp = &m; 1931 size_t ovalsize = sopt->sopt_valsize; 1932 caddr_t oval = (caddr_t)sopt->sopt_val; 1933 1934 error = soopt_getm(sopt, &m); /* XXX */ 1935 if (error != 0) 1936 break; 1937 error = soopt_mcopyin(sopt, m); /* XXX */ 1938 if (error != 0) 1939 break; 1940 sopt->sopt_valsize = ovalsize; 1941 sopt->sopt_val = oval; 1942 if (m) { 1943 req = mtod(m, caddr_t); 1944 len = m->m_len; 1945 } 1946 error = ipsec_get_policy(in6p, req, len, mp); 1947 if (error == 0) 1948 error = soopt_mcopyout(sopt, m); /* XXX */ 1949 if (error == 0 && m) 1950 m_freem(m); 1951 break; 1952 } 1953#endif /* IPSEC */ 1954 1955 default: 1956 error = ENOPROTOOPT; 1957 break; 1958 } 1959 break; 1960 } 1961 } 1962 return (error); 1963} 1964 1965int 1966ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1967{ 1968 int error = 0, optval, optlen; 1969 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1970 struct inpcb *in6p = sotoinpcb(so); 1971 int level, op, optname; 1972 1973 level = sopt->sopt_level; 1974 op = sopt->sopt_dir; 1975 optname = sopt->sopt_name; 1976 optlen = sopt->sopt_valsize; 1977 1978 if (level != IPPROTO_IPV6) { 1979 return (EINVAL); 1980 } 1981 1982 switch (optname) { 1983 case IPV6_CHECKSUM: 1984 /* 1985 * For ICMPv6 sockets, no modification allowed for checksum 1986 * offset, permit "no change" values to help existing apps. 1987 * 1988 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 1989 * for an ICMPv6 socket will fail." 1990 * The current behavior does not meet RFC3542. 1991 */ 1992 switch (op) { 1993 case SOPT_SET: 1994 if (optlen != sizeof(int)) { 1995 error = EINVAL; 1996 break; 1997 } 1998 error = sooptcopyin(sopt, &optval, sizeof(optval), 1999 sizeof(optval)); 2000 if (error) 2001 break; 2002 if ((optval % 2) != 0) { 2003 /* the API assumes even offset values */ 2004 error = EINVAL; 2005 } else if (so->so_proto->pr_protocol == 2006 IPPROTO_ICMPV6) { 2007 if (optval != icmp6off) 2008 error = EINVAL; 2009 } else 2010 in6p->in6p_cksum = optval; 2011 break; 2012 2013 case SOPT_GET: 2014 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2015 optval = icmp6off; 2016 else 2017 optval = in6p->in6p_cksum; 2018 2019 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2020 break; 2021 2022 default: 2023 error = EINVAL; 2024 break; 2025 } 2026 break; 2027 2028 default: 2029 error = ENOPROTOOPT; 2030 break; 2031 } 2032 2033 return (error); 2034} 2035 2036/* 2037 * Set up IP6 options in pcb for insertion in output packets or 2038 * specifying behavior of outgoing packets. 2039 */ 2040static int 2041ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2042 struct socket *so, struct sockopt *sopt) 2043{ 2044 struct ip6_pktopts *opt = *pktopt; 2045 int error = 0; 2046 struct thread *td = sopt->sopt_td; 2047 2048 /* turn off any old options. */ 2049 if (opt) { 2050#ifdef DIAGNOSTIC 2051 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2052 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2053 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2054 printf("ip6_pcbopts: all specified options are cleared.\n"); 2055#endif 2056 ip6_clearpktopts(opt, -1); 2057 } else 2058 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2059 *pktopt = NULL; 2060 2061 if (!m || m->m_len == 0) { 2062 /* 2063 * Only turning off any previous options, regardless of 2064 * whether the opt is just created or given. 2065 */ 2066 free(opt, M_IP6OPT); 2067 return (0); 2068 } 2069 2070 /* set options specified by user. */ 2071 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2072 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2073 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2074 free(opt, M_IP6OPT); 2075 return (error); 2076 } 2077 *pktopt = opt; 2078 return (0); 2079} 2080 2081/* 2082 * initialize ip6_pktopts. beware that there are non-zero default values in 2083 * the struct. 2084 */ 2085void 2086ip6_initpktopts(struct ip6_pktopts *opt) 2087{ 2088 2089 bzero(opt, sizeof(*opt)); 2090 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2091 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2092 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2093 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2094} 2095 2096static int 2097ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2098 struct ucred *cred, int uproto) 2099{ 2100 struct ip6_pktopts *opt; 2101 2102 if (*pktopt == NULL) { 2103 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2104 M_WAITOK); 2105 ip6_initpktopts(*pktopt); 2106 } 2107 opt = *pktopt; 2108 2109 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2110} 2111 2112static int 2113ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2114{ 2115 void *optdata = NULL; 2116 int optdatalen = 0; 2117 struct ip6_ext *ip6e; 2118 int error = 0; 2119 struct in6_pktinfo null_pktinfo; 2120 int deftclass = 0, on; 2121 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2122 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2123 2124 switch (optname) { 2125 case IPV6_PKTINFO: 2126 if (pktopt && pktopt->ip6po_pktinfo) 2127 optdata = (void *)pktopt->ip6po_pktinfo; 2128 else { 2129 /* XXX: we don't have to do this every time... */ 2130 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2131 optdata = (void *)&null_pktinfo; 2132 } 2133 optdatalen = sizeof(struct in6_pktinfo); 2134 break; 2135 case IPV6_TCLASS: 2136 if (pktopt && pktopt->ip6po_tclass >= 0) 2137 optdata = (void *)&pktopt->ip6po_tclass; 2138 else 2139 optdata = (void *)&deftclass; 2140 optdatalen = sizeof(int); 2141 break; 2142 case IPV6_HOPOPTS: 2143 if (pktopt && pktopt->ip6po_hbh) { 2144 optdata = (void *)pktopt->ip6po_hbh; 2145 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2146 optdatalen = (ip6e->ip6e_len + 1) << 3; 2147 } 2148 break; 2149 case IPV6_RTHDR: 2150 if (pktopt && pktopt->ip6po_rthdr) { 2151 optdata = (void *)pktopt->ip6po_rthdr; 2152 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2153 optdatalen = (ip6e->ip6e_len + 1) << 3; 2154 } 2155 break; 2156 case IPV6_RTHDRDSTOPTS: 2157 if (pktopt && pktopt->ip6po_dest1) { 2158 optdata = (void *)pktopt->ip6po_dest1; 2159 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2160 optdatalen = (ip6e->ip6e_len + 1) << 3; 2161 } 2162 break; 2163 case IPV6_DSTOPTS: 2164 if (pktopt && pktopt->ip6po_dest2) { 2165 optdata = (void *)pktopt->ip6po_dest2; 2166 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2167 optdatalen = (ip6e->ip6e_len + 1) << 3; 2168 } 2169 break; 2170 case IPV6_NEXTHOP: 2171 if (pktopt && pktopt->ip6po_nexthop) { 2172 optdata = (void *)pktopt->ip6po_nexthop; 2173 optdatalen = pktopt->ip6po_nexthop->sa_len; 2174 } 2175 break; 2176 case IPV6_USE_MIN_MTU: 2177 if (pktopt) 2178 optdata = (void *)&pktopt->ip6po_minmtu; 2179 else 2180 optdata = (void *)&defminmtu; 2181 optdatalen = sizeof(int); 2182 break; 2183 case IPV6_DONTFRAG: 2184 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2185 on = 1; 2186 else 2187 on = 0; 2188 optdata = (void *)&on; 2189 optdatalen = sizeof(on); 2190 break; 2191 case IPV6_PREFER_TEMPADDR: 2192 if (pktopt) 2193 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2194 else 2195 optdata = (void *)&defpreftemp; 2196 optdatalen = sizeof(int); 2197 break; 2198 default: /* should not happen */ 2199#ifdef DIAGNOSTIC 2200 panic("ip6_getpcbopt: unexpected option\n"); 2201#endif 2202 return (ENOPROTOOPT); 2203 } 2204 2205 error = sooptcopyout(sopt, optdata, optdatalen); 2206 2207 return (error); 2208} 2209 2210void 2211ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2212{ 2213 if (pktopt == NULL) 2214 return; 2215 2216 if (optname == -1 || optname == IPV6_PKTINFO) { 2217 if (pktopt->ip6po_pktinfo) 2218 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2219 pktopt->ip6po_pktinfo = NULL; 2220 } 2221 if (optname == -1 || optname == IPV6_HOPLIMIT) 2222 pktopt->ip6po_hlim = -1; 2223 if (optname == -1 || optname == IPV6_TCLASS) 2224 pktopt->ip6po_tclass = -1; 2225 if (optname == -1 || optname == IPV6_NEXTHOP) { 2226 if (pktopt->ip6po_nextroute.ro_rt) { 2227 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2228 pktopt->ip6po_nextroute.ro_rt = NULL; 2229 } 2230 if (pktopt->ip6po_nexthop) 2231 free(pktopt->ip6po_nexthop, M_IP6OPT); 2232 pktopt->ip6po_nexthop = NULL; 2233 } 2234 if (optname == -1 || optname == IPV6_HOPOPTS) { 2235 if (pktopt->ip6po_hbh) 2236 free(pktopt->ip6po_hbh, M_IP6OPT); 2237 pktopt->ip6po_hbh = NULL; 2238 } 2239 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2240 if (pktopt->ip6po_dest1) 2241 free(pktopt->ip6po_dest1, M_IP6OPT); 2242 pktopt->ip6po_dest1 = NULL; 2243 } 2244 if (optname == -1 || optname == IPV6_RTHDR) { 2245 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2246 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2247 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2248 if (pktopt->ip6po_route.ro_rt) { 2249 RTFREE(pktopt->ip6po_route.ro_rt); 2250 pktopt->ip6po_route.ro_rt = NULL; 2251 } 2252 } 2253 if (optname == -1 || optname == IPV6_DSTOPTS) { 2254 if (pktopt->ip6po_dest2) 2255 free(pktopt->ip6po_dest2, M_IP6OPT); 2256 pktopt->ip6po_dest2 = NULL; 2257 } 2258} 2259 2260#define PKTOPT_EXTHDRCPY(type) \ 2261do {\ 2262 if (src->type) {\ 2263 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2264 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2265 if (dst->type == NULL && canwait == M_NOWAIT)\ 2266 goto bad;\ 2267 bcopy(src->type, dst->type, hlen);\ 2268 }\ 2269} while (/*CONSTCOND*/ 0) 2270 2271static int 2272copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2273{ 2274 if (dst == NULL || src == NULL) { 2275 printf("ip6_clearpktopts: invalid argument\n"); 2276 return (EINVAL); 2277 } 2278 2279 dst->ip6po_hlim = src->ip6po_hlim; 2280 dst->ip6po_tclass = src->ip6po_tclass; 2281 dst->ip6po_flags = src->ip6po_flags; 2282 dst->ip6po_minmtu = src->ip6po_minmtu; 2283 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2284 if (src->ip6po_pktinfo) { 2285 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2286 M_IP6OPT, canwait); 2287 if (dst->ip6po_pktinfo == NULL) 2288 goto bad; 2289 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2290 } 2291 if (src->ip6po_nexthop) { 2292 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2293 M_IP6OPT, canwait); 2294 if (dst->ip6po_nexthop == NULL) 2295 goto bad; 2296 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2297 src->ip6po_nexthop->sa_len); 2298 } 2299 PKTOPT_EXTHDRCPY(ip6po_hbh); 2300 PKTOPT_EXTHDRCPY(ip6po_dest1); 2301 PKTOPT_EXTHDRCPY(ip6po_dest2); 2302 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2303 return (0); 2304 2305 bad: 2306 ip6_clearpktopts(dst, -1); 2307 return (ENOBUFS); 2308} 2309#undef PKTOPT_EXTHDRCPY 2310 2311struct ip6_pktopts * 2312ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2313{ 2314 int error; 2315 struct ip6_pktopts *dst; 2316 2317 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2318 if (dst == NULL) 2319 return (NULL); 2320 ip6_initpktopts(dst); 2321 2322 if ((error = copypktopts(dst, src, canwait)) != 0) { 2323 free(dst, M_IP6OPT); 2324 return (NULL); 2325 } 2326 2327 return (dst); 2328} 2329 2330void 2331ip6_freepcbopts(struct ip6_pktopts *pktopt) 2332{ 2333 if (pktopt == NULL) 2334 return; 2335 2336 ip6_clearpktopts(pktopt, -1); 2337 2338 free(pktopt, M_IP6OPT); 2339} 2340 2341/* 2342 * Set IPv6 outgoing packet options based on advanced API. 2343 */ 2344int 2345ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2346 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2347{ 2348 struct cmsghdr *cm = 0; 2349 2350 if (control == NULL || opt == NULL) 2351 return (EINVAL); 2352 2353 ip6_initpktopts(opt); 2354 if (stickyopt) { 2355 int error; 2356 2357 /* 2358 * If stickyopt is provided, make a local copy of the options 2359 * for this particular packet, then override them by ancillary 2360 * objects. 2361 * XXX: copypktopts() does not copy the cached route to a next 2362 * hop (if any). This is not very good in terms of efficiency, 2363 * but we can allow this since this option should be rarely 2364 * used. 2365 */ 2366 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2367 return (error); 2368 } 2369 2370 /* 2371 * XXX: Currently, we assume all the optional information is stored 2372 * in a single mbuf. 2373 */ 2374 if (control->m_next) 2375 return (EINVAL); 2376 2377 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2378 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2379 int error; 2380 2381 if (control->m_len < CMSG_LEN(0)) 2382 return (EINVAL); 2383 2384 cm = mtod(control, struct cmsghdr *); 2385 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2386 return (EINVAL); 2387 if (cm->cmsg_level != IPPROTO_IPV6) 2388 continue; 2389 2390 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2391 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2392 if (error) 2393 return (error); 2394 } 2395 2396 return (0); 2397} 2398 2399/* 2400 * Set a particular packet option, as a sticky option or an ancillary data 2401 * item. "len" can be 0 only when it's a sticky option. 2402 * We have 4 cases of combination of "sticky" and "cmsg": 2403 * "sticky=0, cmsg=0": impossible 2404 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2405 * "sticky=1, cmsg=0": RFC3542 socket option 2406 * "sticky=1, cmsg=1": RFC2292 socket option 2407 */ 2408static int 2409ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2410 struct ucred *cred, int sticky, int cmsg, int uproto) 2411{ 2412 int minmtupolicy, preftemp; 2413 int error; 2414 2415 if (!sticky && !cmsg) { 2416#ifdef DIAGNOSTIC 2417 printf("ip6_setpktopt: impossible case\n"); 2418#endif 2419 return (EINVAL); 2420 } 2421 2422 /* 2423 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2424 * not be specified in the context of RFC3542. Conversely, 2425 * RFC3542 types should not be specified in the context of RFC2292. 2426 */ 2427 if (!cmsg) { 2428 switch (optname) { 2429 case IPV6_2292PKTINFO: 2430 case IPV6_2292HOPLIMIT: 2431 case IPV6_2292NEXTHOP: 2432 case IPV6_2292HOPOPTS: 2433 case IPV6_2292DSTOPTS: 2434 case IPV6_2292RTHDR: 2435 case IPV6_2292PKTOPTIONS: 2436 return (ENOPROTOOPT); 2437 } 2438 } 2439 if (sticky && cmsg) { 2440 switch (optname) { 2441 case IPV6_PKTINFO: 2442 case IPV6_HOPLIMIT: 2443 case IPV6_NEXTHOP: 2444 case IPV6_HOPOPTS: 2445 case IPV6_DSTOPTS: 2446 case IPV6_RTHDRDSTOPTS: 2447 case IPV6_RTHDR: 2448 case IPV6_USE_MIN_MTU: 2449 case IPV6_DONTFRAG: 2450 case IPV6_TCLASS: 2451 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2452 return (ENOPROTOOPT); 2453 } 2454 } 2455 2456 switch (optname) { 2457 case IPV6_2292PKTINFO: 2458 case IPV6_PKTINFO: 2459 { 2460 struct ifnet *ifp = NULL; 2461 struct in6_pktinfo *pktinfo; 2462 2463 if (len != sizeof(struct in6_pktinfo)) 2464 return (EINVAL); 2465 2466 pktinfo = (struct in6_pktinfo *)buf; 2467 2468 /* 2469 * An application can clear any sticky IPV6_PKTINFO option by 2470 * doing a "regular" setsockopt with ipi6_addr being 2471 * in6addr_any and ipi6_ifindex being zero. 2472 * [RFC 3542, Section 6] 2473 */ 2474 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2475 pktinfo->ipi6_ifindex == 0 && 2476 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2477 ip6_clearpktopts(opt, optname); 2478 break; 2479 } 2480 2481 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2482 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2483 return (EINVAL); 2484 } 2485 2486 /* validate the interface index if specified. */ 2487 if (pktinfo->ipi6_ifindex > V_if_index || 2488 pktinfo->ipi6_ifindex < 0) { 2489 return (ENXIO); 2490 } 2491 if (pktinfo->ipi6_ifindex) { 2492 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2493 if (ifp == NULL) 2494 return (ENXIO); 2495 } 2496 2497 /* 2498 * We store the address anyway, and let in6_selectsrc() 2499 * validate the specified address. This is because ipi6_addr 2500 * may not have enough information about its scope zone, and 2501 * we may need additional information (such as outgoing 2502 * interface or the scope zone of a destination address) to 2503 * disambiguate the scope. 2504 * XXX: the delay of the validation may confuse the 2505 * application when it is used as a sticky option. 2506 */ 2507 if (opt->ip6po_pktinfo == NULL) { 2508 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2509 M_IP6OPT, M_NOWAIT); 2510 if (opt->ip6po_pktinfo == NULL) 2511 return (ENOBUFS); 2512 } 2513 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2514 break; 2515 } 2516 2517 case IPV6_2292HOPLIMIT: 2518 case IPV6_HOPLIMIT: 2519 { 2520 int *hlimp; 2521 2522 /* 2523 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2524 * to simplify the ordering among hoplimit options. 2525 */ 2526 if (optname == IPV6_HOPLIMIT && sticky) 2527 return (ENOPROTOOPT); 2528 2529 if (len != sizeof(int)) 2530 return (EINVAL); 2531 hlimp = (int *)buf; 2532 if (*hlimp < -1 || *hlimp > 255) 2533 return (EINVAL); 2534 2535 opt->ip6po_hlim = *hlimp; 2536 break; 2537 } 2538 2539 case IPV6_TCLASS: 2540 { 2541 int tclass; 2542 2543 if (len != sizeof(int)) 2544 return (EINVAL); 2545 tclass = *(int *)buf; 2546 if (tclass < -1 || tclass > 255) 2547 return (EINVAL); 2548 2549 opt->ip6po_tclass = tclass; 2550 break; 2551 } 2552 2553 case IPV6_2292NEXTHOP: 2554 case IPV6_NEXTHOP: 2555 if (cred != NULL) { 2556 error = priv_check_cred(cred, 2557 PRIV_NETINET_SETHDROPTS, 0); 2558 if (error) 2559 return (error); 2560 } 2561 2562 if (len == 0) { /* just remove the option */ 2563 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2564 break; 2565 } 2566 2567 /* check if cmsg_len is large enough for sa_len */ 2568 if (len < sizeof(struct sockaddr) || len < *buf) 2569 return (EINVAL); 2570 2571 switch (((struct sockaddr *)buf)->sa_family) { 2572 case AF_INET6: 2573 { 2574 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2575 int error; 2576 2577 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2578 return (EINVAL); 2579 2580 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2581 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2582 return (EINVAL); 2583 } 2584 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2585 != 0) { 2586 return (error); 2587 } 2588 break; 2589 } 2590 case AF_LINK: /* should eventually be supported */ 2591 default: 2592 return (EAFNOSUPPORT); 2593 } 2594 2595 /* turn off the previous option, then set the new option. */ 2596 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2597 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2598 if (opt->ip6po_nexthop == NULL) 2599 return (ENOBUFS); 2600 bcopy(buf, opt->ip6po_nexthop, *buf); 2601 break; 2602 2603 case IPV6_2292HOPOPTS: 2604 case IPV6_HOPOPTS: 2605 { 2606 struct ip6_hbh *hbh; 2607 int hbhlen; 2608 2609 /* 2610 * XXX: We don't allow a non-privileged user to set ANY HbH 2611 * options, since per-option restriction has too much 2612 * overhead. 2613 */ 2614 if (cred != NULL) { 2615 error = priv_check_cred(cred, 2616 PRIV_NETINET_SETHDROPTS, 0); 2617 if (error) 2618 return (error); 2619 } 2620 2621 if (len == 0) { 2622 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2623 break; /* just remove the option */ 2624 } 2625 2626 /* message length validation */ 2627 if (len < sizeof(struct ip6_hbh)) 2628 return (EINVAL); 2629 hbh = (struct ip6_hbh *)buf; 2630 hbhlen = (hbh->ip6h_len + 1) << 3; 2631 if (len != hbhlen) 2632 return (EINVAL); 2633 2634 /* turn off the previous option, then set the new option. */ 2635 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2636 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2637 if (opt->ip6po_hbh == NULL) 2638 return (ENOBUFS); 2639 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2640 2641 break; 2642 } 2643 2644 case IPV6_2292DSTOPTS: 2645 case IPV6_DSTOPTS: 2646 case IPV6_RTHDRDSTOPTS: 2647 { 2648 struct ip6_dest *dest, **newdest = NULL; 2649 int destlen; 2650 2651 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2652 error = priv_check_cred(cred, 2653 PRIV_NETINET_SETHDROPTS, 0); 2654 if (error) 2655 return (error); 2656 } 2657 2658 if (len == 0) { 2659 ip6_clearpktopts(opt, optname); 2660 break; /* just remove the option */ 2661 } 2662 2663 /* message length validation */ 2664 if (len < sizeof(struct ip6_dest)) 2665 return (EINVAL); 2666 dest = (struct ip6_dest *)buf; 2667 destlen = (dest->ip6d_len + 1) << 3; 2668 if (len != destlen) 2669 return (EINVAL); 2670 2671 /* 2672 * Determine the position that the destination options header 2673 * should be inserted; before or after the routing header. 2674 */ 2675 switch (optname) { 2676 case IPV6_2292DSTOPTS: 2677 /* 2678 * The old advacned API is ambiguous on this point. 2679 * Our approach is to determine the position based 2680 * according to the existence of a routing header. 2681 * Note, however, that this depends on the order of the 2682 * extension headers in the ancillary data; the 1st 2683 * part of the destination options header must appear 2684 * before the routing header in the ancillary data, 2685 * too. 2686 * RFC3542 solved the ambiguity by introducing 2687 * separate ancillary data or option types. 2688 */ 2689 if (opt->ip6po_rthdr == NULL) 2690 newdest = &opt->ip6po_dest1; 2691 else 2692 newdest = &opt->ip6po_dest2; 2693 break; 2694 case IPV6_RTHDRDSTOPTS: 2695 newdest = &opt->ip6po_dest1; 2696 break; 2697 case IPV6_DSTOPTS: 2698 newdest = &opt->ip6po_dest2; 2699 break; 2700 } 2701 2702 /* turn off the previous option, then set the new option. */ 2703 ip6_clearpktopts(opt, optname); 2704 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2705 if (*newdest == NULL) 2706 return (ENOBUFS); 2707 bcopy(dest, *newdest, destlen); 2708 2709 break; 2710 } 2711 2712 case IPV6_2292RTHDR: 2713 case IPV6_RTHDR: 2714 { 2715 struct ip6_rthdr *rth; 2716 int rthlen; 2717 2718 if (len == 0) { 2719 ip6_clearpktopts(opt, IPV6_RTHDR); 2720 break; /* just remove the option */ 2721 } 2722 2723 /* message length validation */ 2724 if (len < sizeof(struct ip6_rthdr)) 2725 return (EINVAL); 2726 rth = (struct ip6_rthdr *)buf; 2727 rthlen = (rth->ip6r_len + 1) << 3; 2728 if (len != rthlen) 2729 return (EINVAL); 2730 2731 switch (rth->ip6r_type) { 2732 case IPV6_RTHDR_TYPE_0: 2733 if (rth->ip6r_len == 0) /* must contain one addr */ 2734 return (EINVAL); 2735 if (rth->ip6r_len % 2) /* length must be even */ 2736 return (EINVAL); 2737 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2738 return (EINVAL); 2739 break; 2740 default: 2741 return (EINVAL); /* not supported */ 2742 } 2743 2744 /* turn off the previous option */ 2745 ip6_clearpktopts(opt, IPV6_RTHDR); 2746 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2747 if (opt->ip6po_rthdr == NULL) 2748 return (ENOBUFS); 2749 bcopy(rth, opt->ip6po_rthdr, rthlen); 2750 2751 break; 2752 } 2753 2754 case IPV6_USE_MIN_MTU: 2755 if (len != sizeof(int)) 2756 return (EINVAL); 2757 minmtupolicy = *(int *)buf; 2758 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2759 minmtupolicy != IP6PO_MINMTU_DISABLE && 2760 minmtupolicy != IP6PO_MINMTU_ALL) { 2761 return (EINVAL); 2762 } 2763 opt->ip6po_minmtu = minmtupolicy; 2764 break; 2765 2766 case IPV6_DONTFRAG: 2767 if (len != sizeof(int)) 2768 return (EINVAL); 2769 2770 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2771 /* 2772 * we ignore this option for TCP sockets. 2773 * (RFC3542 leaves this case unspecified.) 2774 */ 2775 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2776 } else 2777 opt->ip6po_flags |= IP6PO_DONTFRAG; 2778 break; 2779 2780 case IPV6_PREFER_TEMPADDR: 2781 if (len != sizeof(int)) 2782 return (EINVAL); 2783 preftemp = *(int *)buf; 2784 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2785 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2786 preftemp != IP6PO_TEMPADDR_PREFER) { 2787 return (EINVAL); 2788 } 2789 opt->ip6po_prefer_tempaddr = preftemp; 2790 break; 2791 2792 default: 2793 return (ENOPROTOOPT); 2794 } /* end of switch */ 2795 2796 return (0); 2797} 2798 2799/* 2800 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2801 * packet to the input queue of a specified interface. Note that this 2802 * calls the output routine of the loopback "driver", but with an interface 2803 * pointer that might NOT be &loif -- easier than replicating that code here. 2804 */ 2805void 2806ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2807{ 2808 struct mbuf *copym; 2809 struct ip6_hdr *ip6; 2810 2811 copym = m_copy(m, 0, M_COPYALL); 2812 if (copym == NULL) 2813 return; 2814 2815 /* 2816 * Make sure to deep-copy IPv6 header portion in case the data 2817 * is in an mbuf cluster, so that we can safely override the IPv6 2818 * header portion later. 2819 */ 2820 if ((copym->m_flags & M_EXT) != 0 || 2821 copym->m_len < sizeof(struct ip6_hdr)) { 2822 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2823 if (copym == NULL) 2824 return; 2825 } 2826 2827#ifdef DIAGNOSTIC 2828 if (copym->m_len < sizeof(*ip6)) { 2829 m_freem(copym); 2830 return; 2831 } 2832#endif 2833 2834 ip6 = mtod(copym, struct ip6_hdr *); 2835 /* 2836 * clear embedded scope identifiers if necessary. 2837 * in6_clearscope will touch the addresses only when necessary. 2838 */ 2839 in6_clearscope(&ip6->ip6_src); 2840 in6_clearscope(&ip6->ip6_dst); 2841 2842 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2843} 2844 2845/* 2846 * Chop IPv6 header off from the payload. 2847 */ 2848static int 2849ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2850{ 2851 struct mbuf *mh; 2852 struct ip6_hdr *ip6; 2853 2854 ip6 = mtod(m, struct ip6_hdr *); 2855 if (m->m_len > sizeof(*ip6)) { 2856 mh = m_gethdr(M_NOWAIT, MT_DATA); 2857 if (mh == NULL) { 2858 m_freem(m); 2859 return ENOBUFS; 2860 } 2861 m_move_pkthdr(mh, m); 2862 MH_ALIGN(mh, sizeof(*ip6)); 2863 m->m_len -= sizeof(*ip6); 2864 m->m_data += sizeof(*ip6); 2865 mh->m_next = m; 2866 m = mh; 2867 m->m_len = sizeof(*ip6); 2868 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2869 } 2870 exthdrs->ip6e_ip6 = m; 2871 return 0; 2872} 2873 2874/* 2875 * Compute IPv6 extension header length. 2876 */ 2877int 2878ip6_optlen(struct inpcb *in6p) 2879{ 2880 int len; 2881 2882 if (!in6p->in6p_outputopts) 2883 return 0; 2884 2885 len = 0; 2886#define elen(x) \ 2887 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2888 2889 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2890 if (in6p->in6p_outputopts->ip6po_rthdr) 2891 /* dest1 is valid with rthdr only */ 2892 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2893 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2894 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2895 return len; 2896#undef elen 2897} 2898