ip6_output.c revision 284570
1289177Speter/*- 2289177Speter * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3289177Speter * All rights reserved. 4289177Speter * 5289177Speter * Redistribution and use in source and binary forms, with or without 6289177Speter * modification, are permitted provided that the following conditions 7289177Speter * are met: 8289177Speter * 1. Redistributions of source code must retain the above copyright 9289177Speter * notice, this list of conditions and the following disclaimer. 10289177Speter * 2. Redistributions in binary form must reproduce the above copyright 11289177Speter * notice, this list of conditions and the following disclaimer in the 12289177Speter * documentation and/or other materials provided with the distribution. 13289177Speter * 3. Neither the name of the project nor the names of its contributors 14289177Speter * may be used to endorse or promote products derived from this software 15289177Speter * without specific prior written permission. 16289177Speter * 17289177Speter * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18289177Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19289177Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20289177Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21289177Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22289177Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23289177Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24289177Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25289177Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26289177Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27289177Speter * SUCH DAMAGE. 28289177Speter * 29289177Speter * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30289177Speter */ 31289177Speter 32289177Speter/*- 33289177Speter * Copyright (c) 1982, 1986, 1988, 1990, 1993 34289177Speter * The Regents of the University of California. All rights reserved. 35289177Speter * 36289177Speter * Redistribution and use in source and binary forms, with or without 37289177Speter * modification, are permitted provided that the following conditions 38289177Speter * are met: 39289177Speter * 1. Redistributions of source code must retain the above copyright 40289177Speter * notice, this list of conditions and the following disclaimer. 41289177Speter * 2. Redistributions in binary form must reproduce the above copyright 42289177Speter * notice, this list of conditions and the following disclaimer in the 43289177Speter * documentation and/or other materials provided with the distribution. 44289177Speter * 4. Neither the name of the University nor the names of its contributors 45289177Speter * may be used to endorse or promote products derived from this software 46289177Speter * without specific prior written permission. 47289177Speter * 48289177Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49289177Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50289177Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51289177Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52289177Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53289177Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54289177Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55289177Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56289177Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57289177Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58289177Speter * SUCH DAMAGE. 59289177Speter * 60289177Speter * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61289177Speter */ 62289177Speter 63289177Speter#include <sys/cdefs.h> 64289177Speter__FBSDID("$FreeBSD: stable/10/sys/netinet6/ip6_output.c 284570 2015-06-18 20:32:53Z kp $"); 65289177Speter 66289177Speter#include "opt_inet.h" 67289177Speter#include "opt_inet6.h" 68289177Speter#include "opt_ipfw.h" 69289177Speter#include "opt_ipsec.h" 70289177Speter#include "opt_sctp.h" 71289177Speter#include "opt_route.h" 72289177Speter 73289177Speter#include <sys/param.h> 74289177Speter#include <sys/kernel.h> 75289177Speter#include <sys/malloc.h> 76289177Speter#include <sys/mbuf.h> 77289177Speter#include <sys/errno.h> 78289177Speter#include <sys/priv.h> 79289177Speter#include <sys/proc.h> 80289177Speter#include <sys/protosw.h> 81289177Speter#include <sys/socket.h> 82289177Speter#include <sys/socketvar.h> 83289177Speter#include <sys/syslog.h> 84289177Speter#include <sys/ucred.h> 85289177Speter 86289177Speter#include <machine/in_cksum.h> 87289177Speter 88289177Speter#include <net/if.h> 89289177Speter#include <net/netisr.h> 90289177Speter#include <net/route.h> 91289177Speter#include <net/pfil.h> 92289177Speter#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 211int 212ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 213 int mtu) 214{ 215 struct mbuf *m, **mnext, *m_frgpart; 216 struct ip6_hdr *ip6, *mhip6; 217 struct ip6_frag *ip6f; 218 int off; 219 int error; 220 int tlen = m0->m_pkthdr.len; 221 uint32_t id = htonl(ip6_randomid()); 222 223 m = m0; 224 ip6 = mtod(m, struct ip6_hdr *); 225 mnext = &m->m_nextpkt; 226 227 for (off = hlen; off < tlen; off += mtu) { 228 m = m_gethdr(M_NOWAIT, MT_DATA); 229 if (!m) { 230 IP6STAT_INC(ip6s_odropped); 231 return (ENOBUFS); 232 } 233 m->m_flags = m0->m_flags & M_COPYFLAGS; 234 *mnext = m; 235 mnext = &m->m_nextpkt; 236 m->m_data += max_linkhdr; 237 mhip6 = mtod(m, struct ip6_hdr *); 238 *mhip6 = *ip6; 239 m->m_len = sizeof(*mhip6); 240 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 241 if (error) { 242 IP6STAT_INC(ip6s_odropped); 243 return (error); 244 } 245 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 246 if (off + mtu >= tlen) 247 mtu = tlen - off; 248 else 249 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 250 mhip6->ip6_plen = htons((u_short)(mtu + hlen + 251 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 252 if ((m_frgpart = m_copy(m0, off, mtu)) == 0) { 253 IP6STAT_INC(ip6s_odropped); 254 return (ENOBUFS); 255 } 256 m_cat(m, m_frgpart); 257 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f); 258 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 259 m->m_pkthdr.rcvif = NULL; 260 ip6f->ip6f_reserved = 0; 261 ip6f->ip6f_ident = id; 262 ip6f->ip6f_nxt = nextproto; 263 IP6STAT_INC(ip6s_ofragments); 264 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 265 } 266 267 return (0); 268} 269 270/* 271 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 272 * header (with pri, len, nxt, hlim, src, dst). 273 * This function may modify ver and hlim only. 274 * The mbuf chain containing the packet will be freed. 275 * The mbuf opt, if present, will not be freed. 276 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 277 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 278 * then result of route lookup is stored in ro->ro_rt. 279 * 280 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 281 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 282 * which is rt_mtu. 283 * 284 * ifpp - XXX: just for statistics 285 */ 286int 287ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 288 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 289 struct ifnet **ifpp, struct inpcb *inp) 290{ 291 struct ip6_hdr *ip6; 292 struct ifnet *ifp, *origifp; 293 struct mbuf *m = m0; 294 struct mbuf *mprev = NULL; 295 int hlen, tlen, len; 296 struct route_in6 ip6route; 297 struct rtentry *rt = NULL; 298 struct sockaddr_in6 *dst, src_sa, dst_sa; 299 struct in6_addr odst; 300 int error = 0; 301 struct in6_ifaddr *ia = NULL; 302 u_long mtu; 303 int alwaysfrag, dontfrag; 304 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 305 struct ip6_exthdrs exthdrs; 306 struct in6_addr finaldst, src0, dst0; 307 u_int32_t zone; 308 struct route_in6 *ro_pmtu = NULL; 309 int hdrsplit = 0; 310 int sw_csum, tso; 311 struct m_tag *fwd_tag = NULL; 312 313 ip6 = mtod(m, struct ip6_hdr *); 314 if (ip6 == NULL) { 315 printf ("ip6 is NULL"); 316 goto bad; 317 } 318 319 if (inp != NULL) 320 M_SETFIB(m, inp->inp_inc.inc_fibnum); 321 322 finaldst = ip6->ip6_dst; 323 bzero(&exthdrs, sizeof(exthdrs)); 324 if (opt) { 325 /* Hop-by-Hop options header */ 326 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 327 /* Destination options header(1st part) */ 328 if (opt->ip6po_rthdr) { 329 /* 330 * Destination options header(1st part) 331 * This only makes sense with a routing header. 332 * See Section 9.2 of RFC 3542. 333 * Disabling this part just for MIP6 convenience is 334 * a bad idea. We need to think carefully about a 335 * way to make the advanced API coexist with MIP6 336 * options, which might automatically be inserted in 337 * the kernel. 338 */ 339 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 340 } 341 /* Routing header */ 342 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 343 /* Destination options header(2nd part) */ 344 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 345 } 346 347#ifdef IPSEC 348 /* 349 * IPSec checking which handles several cases. 350 * FAST IPSEC: We re-injected the packet. 351 */ 352 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp)) 353 { 354 case 1: /* Bad packet */ 355 goto freehdrs; 356 case -1: /* IPSec done */ 357 goto done; 358 case 0: /* No IPSec */ 359 default: 360 break; 361 } 362#endif /* IPSEC */ 363 364 /* 365 * Calculate the total length of the extension header chain. 366 * Keep the length of the unfragmentable part for fragmentation. 367 */ 368 optlen = 0; 369 if (exthdrs.ip6e_hbh) 370 optlen += exthdrs.ip6e_hbh->m_len; 371 if (exthdrs.ip6e_dest1) 372 optlen += exthdrs.ip6e_dest1->m_len; 373 if (exthdrs.ip6e_rthdr) 374 optlen += exthdrs.ip6e_rthdr->m_len; 375 unfragpartlen = optlen + sizeof(struct ip6_hdr); 376 377 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 378 if (exthdrs.ip6e_dest2) 379 optlen += exthdrs.ip6e_dest2->m_len; 380 381 /* 382 * If there is at least one extension header, 383 * separate IP6 header from the payload. 384 */ 385 if (optlen && !hdrsplit) { 386 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 387 m = NULL; 388 goto freehdrs; 389 } 390 m = exthdrs.ip6e_ip6; 391 hdrsplit++; 392 } 393 394 /* adjust pointer */ 395 ip6 = mtod(m, struct ip6_hdr *); 396 397 /* adjust mbuf packet header length */ 398 m->m_pkthdr.len += optlen; 399 plen = m->m_pkthdr.len - sizeof(*ip6); 400 401 /* If this is a jumbo payload, insert a jumbo payload option. */ 402 if (plen > IPV6_MAXPACKET) { 403 if (!hdrsplit) { 404 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 405 m = NULL; 406 goto freehdrs; 407 } 408 m = exthdrs.ip6e_ip6; 409 hdrsplit++; 410 } 411 /* adjust pointer */ 412 ip6 = mtod(m, struct ip6_hdr *); 413 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 414 goto freehdrs; 415 ip6->ip6_plen = 0; 416 } else 417 ip6->ip6_plen = htons(plen); 418 419 /* 420 * Concatenate headers and fill in next header fields. 421 * Here we have, on "m" 422 * IPv6 payload 423 * and we insert headers accordingly. Finally, we should be getting: 424 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 425 * 426 * during the header composing process, "m" points to IPv6 header. 427 * "mprev" points to an extension header prior to esp. 428 */ 429 u_char *nexthdrp = &ip6->ip6_nxt; 430 mprev = m; 431 432 /* 433 * we treat dest2 specially. this makes IPsec processing 434 * much easier. the goal here is to make mprev point the 435 * mbuf prior to dest2. 436 * 437 * result: IPv6 dest2 payload 438 * m and mprev will point to IPv6 header. 439 */ 440 if (exthdrs.ip6e_dest2) { 441 if (!hdrsplit) 442 panic("assumption failed: hdr not split"); 443 exthdrs.ip6e_dest2->m_next = m->m_next; 444 m->m_next = exthdrs.ip6e_dest2; 445 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 446 ip6->ip6_nxt = IPPROTO_DSTOPTS; 447 } 448 449 /* 450 * result: IPv6 hbh dest1 rthdr dest2 payload 451 * m will point to IPv6 header. mprev will point to the 452 * extension header prior to dest2 (rthdr in the above case). 453 */ 454 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 455 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 456 IPPROTO_DSTOPTS); 457 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 458 IPPROTO_ROUTING); 459 460 /* 461 * If there is a routing header, discard the packet. 462 */ 463 if (exthdrs.ip6e_rthdr) { 464 error = EINVAL; 465 goto bad; 466 } 467 468 /* Source address validation */ 469 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 470 (flags & IPV6_UNSPECSRC) == 0) { 471 error = EOPNOTSUPP; 472 IP6STAT_INC(ip6s_badscope); 473 goto bad; 474 } 475 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 476 error = EOPNOTSUPP; 477 IP6STAT_INC(ip6s_badscope); 478 goto bad; 479 } 480 481 IP6STAT_INC(ip6s_localout); 482 483 /* 484 * Route packet. 485 */ 486 if (ro == 0) { 487 ro = &ip6route; 488 bzero((caddr_t)ro, sizeof(*ro)); 489 } 490 ro_pmtu = ro; 491 if (opt && opt->ip6po_rthdr) 492 ro = &opt->ip6po_route; 493 dst = (struct sockaddr_in6 *)&ro->ro_dst; 494#ifdef FLOWTABLE 495 if (ro->ro_rt == NULL) 496 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 497#endif 498again: 499 /* 500 * if specified, try to fill in the traffic class field. 501 * do not override if a non-zero value is already set. 502 * we check the diffserv field and the ecn field separately. 503 */ 504 if (opt && opt->ip6po_tclass >= 0) { 505 int mask = 0; 506 507 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 508 mask |= 0xfc; 509 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 510 mask |= 0x03; 511 if (mask != 0) 512 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 513 } 514 515 /* fill in or override the hop limit field, if necessary. */ 516 if (opt && opt->ip6po_hlim != -1) 517 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 518 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 519 if (im6o != NULL) 520 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 521 else 522 ip6->ip6_hlim = V_ip6_defmcasthlim; 523 } 524 525 /* adjust pointer */ 526 ip6 = mtod(m, struct ip6_hdr *); 527 528 if (ro->ro_rt && fwd_tag == NULL) { 529 rt = ro->ro_rt; 530 ifp = ro->ro_rt->rt_ifp; 531 } else { 532 if (fwd_tag == NULL) { 533 bzero(&dst_sa, sizeof(dst_sa)); 534 dst_sa.sin6_family = AF_INET6; 535 dst_sa.sin6_len = sizeof(dst_sa); 536 dst_sa.sin6_addr = ip6->ip6_dst; 537 } 538 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 539 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 540 if (error != 0) { 541 if (ifp != NULL) 542 in6_ifstat_inc(ifp, ifs6_out_discard); 543 goto bad; 544 } 545 } 546 if (rt == NULL) { 547 /* 548 * If in6_selectroute() does not return a route entry, 549 * dst may not have been updated. 550 */ 551 *dst = dst_sa; /* XXX */ 552 } 553 554 /* 555 * then rt (for unicast) and ifp must be non-NULL valid values. 556 */ 557 if ((flags & IPV6_FORWARDING) == 0) { 558 /* XXX: the FORWARDING flag can be set for mrouting. */ 559 in6_ifstat_inc(ifp, ifs6_out_request); 560 } 561 if (rt != NULL) { 562 ia = (struct in6_ifaddr *)(rt->rt_ifa); 563 counter_u64_add(rt->rt_pksent, 1); 564 } 565 566 567 /* 568 * The outgoing interface must be in the zone of source and 569 * destination addresses. 570 */ 571 origifp = ifp; 572 573 src0 = ip6->ip6_src; 574 if (in6_setscope(&src0, origifp, &zone)) 575 goto badscope; 576 bzero(&src_sa, sizeof(src_sa)); 577 src_sa.sin6_family = AF_INET6; 578 src_sa.sin6_len = sizeof(src_sa); 579 src_sa.sin6_addr = ip6->ip6_src; 580 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 581 goto badscope; 582 583 dst0 = ip6->ip6_dst; 584 if (in6_setscope(&dst0, origifp, &zone)) 585 goto badscope; 586 /* re-initialize to be sure */ 587 bzero(&dst_sa, sizeof(dst_sa)); 588 dst_sa.sin6_family = AF_INET6; 589 dst_sa.sin6_len = sizeof(dst_sa); 590 dst_sa.sin6_addr = ip6->ip6_dst; 591 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 592 goto badscope; 593 } 594 595 /* We should use ia_ifp to support the case of 596 * sending packets to an address of our own. 597 */ 598 if (ia != NULL && ia->ia_ifp) 599 ifp = ia->ia_ifp; 600 601 /* scope check is done. */ 602 goto routefound; 603 604 badscope: 605 IP6STAT_INC(ip6s_badscope); 606 in6_ifstat_inc(origifp, ifs6_out_discard); 607 if (error == 0) 608 error = EHOSTUNREACH; /* XXX */ 609 goto bad; 610 611 routefound: 612 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 613 if (opt && opt->ip6po_nextroute.ro_rt) { 614 /* 615 * The nexthop is explicitly specified by the 616 * application. We assume the next hop is an IPv6 617 * address. 618 */ 619 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 620 } 621 else if ((rt->rt_flags & RTF_GATEWAY)) 622 dst = (struct sockaddr_in6 *)rt->rt_gateway; 623 } 624 625 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 626 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 627 } else { 628 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 629 in6_ifstat_inc(ifp, ifs6_out_mcast); 630 /* 631 * Confirm that the outgoing interface supports multicast. 632 */ 633 if (!(ifp->if_flags & IFF_MULTICAST)) { 634 IP6STAT_INC(ip6s_noroute); 635 in6_ifstat_inc(ifp, ifs6_out_discard); 636 error = ENETUNREACH; 637 goto bad; 638 } 639 if ((im6o == NULL && in6_mcast_loop) || 640 (im6o && im6o->im6o_multicast_loop)) { 641 /* 642 * Loop back multicast datagram if not expressly 643 * forbidden to do so, even if we have not joined 644 * the address; protocols will filter it later, 645 * thus deferring a hash lookup and lock acquisition 646 * at the expense of an m_copym(). 647 */ 648 ip6_mloopback(ifp, m, dst); 649 } else { 650 /* 651 * If we are acting as a multicast router, perform 652 * multicast forwarding as if the packet had just 653 * arrived on the interface to which we are about 654 * to send. The multicast forwarding function 655 * recursively calls this function, using the 656 * IPV6_FORWARDING flag to prevent infinite recursion. 657 * 658 * Multicasts that are looped back by ip6_mloopback(), 659 * above, will be forwarded by the ip6_input() routine, 660 * if necessary. 661 */ 662 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 663 /* 664 * XXX: ip6_mforward expects that rcvif is NULL 665 * when it is called from the originating path. 666 * However, it may not always be the case. 667 */ 668 m->m_pkthdr.rcvif = NULL; 669 if (ip6_mforward(ip6, ifp, m) != 0) { 670 m_freem(m); 671 goto done; 672 } 673 } 674 } 675 /* 676 * Multicasts with a hoplimit of zero may be looped back, 677 * above, but must not be transmitted on a network. 678 * Also, multicasts addressed to the loopback interface 679 * are not sent -- the above call to ip6_mloopback() will 680 * loop back a copy if this host actually belongs to the 681 * destination group on the loopback interface. 682 */ 683 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 684 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 685 m_freem(m); 686 goto done; 687 } 688 } 689 690 /* 691 * Fill the outgoing inteface to tell the upper layer 692 * to increment per-interface statistics. 693 */ 694 if (ifpp) 695 *ifpp = ifp; 696 697 /* Determine path MTU. */ 698 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 699 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 700 goto bad; 701 702 /* 703 * The caller of this function may specify to use the minimum MTU 704 * in some cases. 705 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 706 * setting. The logic is a bit complicated; by default, unicast 707 * packets will follow path MTU while multicast packets will be sent at 708 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 709 * including unicast ones will be sent at the minimum MTU. Multicast 710 * packets will always be sent at the minimum MTU unless 711 * IP6PO_MINMTU_DISABLE is explicitly specified. 712 * See RFC 3542 for more details. 713 */ 714 if (mtu > IPV6_MMTU) { 715 if ((flags & IPV6_MINMTU)) 716 mtu = IPV6_MMTU; 717 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 718 mtu = IPV6_MMTU; 719 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 720 (opt == NULL || 721 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 722 mtu = IPV6_MMTU; 723 } 724 } 725 726 /* 727 * clear embedded scope identifiers if necessary. 728 * in6_clearscope will touch the addresses only when necessary. 729 */ 730 in6_clearscope(&ip6->ip6_src); 731 in6_clearscope(&ip6->ip6_dst); 732 733 /* 734 * If the outgoing packet contains a hop-by-hop options header, 735 * it must be examined and processed even by the source node. 736 * (RFC 2460, section 4.) 737 */ 738 if (exthdrs.ip6e_hbh) { 739 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 740 u_int32_t dummy; /* XXX unused */ 741 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 742 743#ifdef DIAGNOSTIC 744 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 745 panic("ip6e_hbh is not contiguous"); 746#endif 747 /* 748 * XXX: if we have to send an ICMPv6 error to the sender, 749 * we need the M_LOOP flag since icmp6_error() expects 750 * the IPv6 and the hop-by-hop options header are 751 * contiguous unless the flag is set. 752 */ 753 m->m_flags |= M_LOOP; 754 m->m_pkthdr.rcvif = ifp; 755 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 756 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 757 &dummy, &plen) < 0) { 758 /* m was already freed at this point */ 759 error = EINVAL;/* better error? */ 760 goto done; 761 } 762 m->m_flags &= ~M_LOOP; /* XXX */ 763 m->m_pkthdr.rcvif = NULL; 764 } 765 766 /* Jump over all PFIL processing if hooks are not active. */ 767 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 768 goto passout; 769 770 odst = ip6->ip6_dst; 771 /* Run through list of hooks for output packets. */ 772 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 773 if (error != 0 || m == NULL) 774 goto done; 775 ip6 = mtod(m, struct ip6_hdr *); 776 777 /* See if destination IP address was changed by packet filter. */ 778 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 779 m->m_flags |= M_SKIP_FIREWALL; 780 /* If destination is now ourself drop to ip6_input(). */ 781 if (in6_localip(&ip6->ip6_dst)) { 782 m->m_flags |= M_FASTFWD_OURS; 783 if (m->m_pkthdr.rcvif == NULL) 784 m->m_pkthdr.rcvif = V_loif; 785 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 786 m->m_pkthdr.csum_flags |= 787 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 788 m->m_pkthdr.csum_data = 0xffff; 789 } 790#ifdef SCTP 791 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 792 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 793#endif 794 error = netisr_queue(NETISR_IPV6, m); 795 goto done; 796 } else 797 goto again; /* Redo the routing table lookup. */ 798 } 799 800 /* See if local, if yes, send it to netisr. */ 801 if (m->m_flags & M_FASTFWD_OURS) { 802 if (m->m_pkthdr.rcvif == NULL) 803 m->m_pkthdr.rcvif = V_loif; 804 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 805 m->m_pkthdr.csum_flags |= 806 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 807 m->m_pkthdr.csum_data = 0xffff; 808 } 809#ifdef SCTP 810 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 811 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 812#endif 813 error = netisr_queue(NETISR_IPV6, m); 814 goto done; 815 } 816 /* Or forward to some other address? */ 817 if ((m->m_flags & M_IP6_NEXTHOP) && 818 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 819 dst = (struct sockaddr_in6 *)&ro->ro_dst; 820 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 821 m->m_flags |= M_SKIP_FIREWALL; 822 m->m_flags &= ~M_IP6_NEXTHOP; 823 m_tag_delete(m, fwd_tag); 824 goto again; 825 } 826 827passout: 828 /* 829 * Send the packet to the outgoing interface. 830 * If necessary, do IPv6 fragmentation before sending. 831 * 832 * the logic here is rather complex: 833 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 834 * 1-a: send as is if tlen <= path mtu 835 * 1-b: fragment if tlen > path mtu 836 * 837 * 2: if user asks us not to fragment (dontfrag == 1) 838 * 2-a: send as is if tlen <= interface mtu 839 * 2-b: error if tlen > interface mtu 840 * 841 * 3: if we always need to attach fragment header (alwaysfrag == 1) 842 * always fragment 843 * 844 * 4: if dontfrag == 1 && alwaysfrag == 1 845 * error, as we cannot handle this conflicting request 846 */ 847 sw_csum = m->m_pkthdr.csum_flags; 848 if (!hdrsplit) { 849 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 850 sw_csum &= ~ifp->if_hwassist; 851 } else 852 tso = 0; 853 /* 854 * If we added extension headers, we will not do TSO and calculate the 855 * checksums ourselves for now. 856 * XXX-BZ Need a framework to know when the NIC can handle it, even 857 * with ext. hdrs. 858 */ 859 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 860 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 861 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 862 } 863#ifdef SCTP 864 if (sw_csum & CSUM_SCTP_IPV6) { 865 sw_csum &= ~CSUM_SCTP_IPV6; 866 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 867 } 868#endif 869 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 870 tlen = m->m_pkthdr.len; 871 872 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 873 dontfrag = 1; 874 else 875 dontfrag = 0; 876 if (dontfrag && alwaysfrag) { /* case 4 */ 877 /* conflicting request - can't transmit */ 878 error = EMSGSIZE; 879 goto bad; 880 } 881 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 882 /* 883 * Even if the DONTFRAG option is specified, we cannot send the 884 * packet when the data length is larger than the MTU of the 885 * outgoing interface. 886 * Notify the error by sending IPV6_PATHMTU ancillary data if 887 * application wanted to know the MTU value. Also return an 888 * error code (this is not described in the API spec). 889 */ 890 if (inp != NULL) 891 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 892 error = EMSGSIZE; 893 goto bad; 894 } 895 896 /* 897 * transmit packet without fragmentation 898 */ 899 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 900 struct in6_ifaddr *ia6; 901 902 ip6 = mtod(m, struct ip6_hdr *); 903 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 904 if (ia6) { 905 /* Record statistics for this interface address. */ 906 ia6->ia_ifa.if_opackets++; 907 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 908 ifa_free(&ia6->ia_ifa); 909 } 910 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 911 goto done; 912 } 913 914 /* 915 * try to fragment the packet. case 1-b and 3 916 */ 917 if (mtu < IPV6_MMTU) { 918 /* path MTU cannot be less than IPV6_MMTU */ 919 error = EMSGSIZE; 920 in6_ifstat_inc(ifp, ifs6_out_fragfail); 921 goto bad; 922 } else if (ip6->ip6_plen == 0) { 923 /* jumbo payload cannot be fragmented */ 924 error = EMSGSIZE; 925 in6_ifstat_inc(ifp, ifs6_out_fragfail); 926 goto bad; 927 } else { 928 u_char nextproto; 929 930 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 931 932 /* 933 * Too large for the destination or interface; 934 * fragment if possible. 935 * Must be able to put at least 8 bytes per fragment. 936 */ 937 hlen = unfragpartlen; 938 if (mtu > IPV6_MAXPACKET) 939 mtu = IPV6_MAXPACKET; 940 941 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 942 if (len < 8) { 943 error = EMSGSIZE; 944 in6_ifstat_inc(ifp, ifs6_out_fragfail); 945 goto bad; 946 } 947 948 /* 949 * Verify that we have any chance at all of being able to queue 950 * the packet or packet fragments 951 */ 952 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 953 < tlen /* - hlen */)) { 954 error = ENOBUFS; 955 IP6STAT_INC(ip6s_odropped); 956 goto bad; 957 } 958 959 960 /* 961 * If the interface will not calculate checksums on 962 * fragmented packets, then do it here. 963 * XXX-BZ handle the hw offloading case. Need flags. 964 */ 965 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 966 in6_delayed_cksum(m, plen, hlen); 967 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 968 } 969#ifdef SCTP 970 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 971 sctp_delayed_cksum(m, hlen); 972 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 973 } 974#endif 975 /* 976 * Change the next header field of the last header in the 977 * unfragmentable part. 978 */ 979 if (exthdrs.ip6e_rthdr) { 980 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 981 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 982 } else if (exthdrs.ip6e_dest1) { 983 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 984 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 985 } else if (exthdrs.ip6e_hbh) { 986 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 987 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 988 } else { 989 nextproto = ip6->ip6_nxt; 990 ip6->ip6_nxt = IPPROTO_FRAGMENT; 991 } 992 993 /* 994 * Loop through length of segment after first fragment, 995 * make new header and copy data of each part and link onto 996 * chain. 997 */ 998 m0 = m; 999 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len))) 1000 goto sendorfree; 1001 1002 in6_ifstat_inc(ifp, ifs6_out_fragok); 1003 } 1004 1005 /* 1006 * Remove leading garbages. 1007 */ 1008sendorfree: 1009 m = m0->m_nextpkt; 1010 m0->m_nextpkt = 0; 1011 m_freem(m0); 1012 for (m0 = m; m; m = m0) { 1013 m0 = m->m_nextpkt; 1014 m->m_nextpkt = 0; 1015 if (error == 0) { 1016 /* Record statistics for this interface address. */ 1017 if (ia) { 1018 ia->ia_ifa.if_opackets++; 1019 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1020 } 1021 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1022 } else 1023 m_freem(m); 1024 } 1025 1026 if (error == 0) 1027 IP6STAT_INC(ip6s_fragmented); 1028 1029done: 1030 if (ro == &ip6route) 1031 RO_RTFREE(ro); 1032 if (ro_pmtu == &ip6route) 1033 RO_RTFREE(ro_pmtu); 1034 return (error); 1035 1036freehdrs: 1037 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1038 m_freem(exthdrs.ip6e_dest1); 1039 m_freem(exthdrs.ip6e_rthdr); 1040 m_freem(exthdrs.ip6e_dest2); 1041 /* FALLTHROUGH */ 1042bad: 1043 if (m) 1044 m_freem(m); 1045 goto done; 1046} 1047 1048static int 1049ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1050{ 1051 struct mbuf *m; 1052 1053 if (hlen > MCLBYTES) 1054 return (ENOBUFS); /* XXX */ 1055 1056 if (hlen > MLEN) 1057 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1058 else 1059 m = m_get(M_NOWAIT, MT_DATA); 1060 if (m == NULL) 1061 return (ENOBUFS); 1062 m->m_len = hlen; 1063 if (hdr) 1064 bcopy(hdr, mtod(m, caddr_t), hlen); 1065 1066 *mp = m; 1067 return (0); 1068} 1069 1070/* 1071 * Insert jumbo payload option. 1072 */ 1073static int 1074ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1075{ 1076 struct mbuf *mopt; 1077 u_char *optbuf; 1078 u_int32_t v; 1079 1080#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1081 1082 /* 1083 * If there is no hop-by-hop options header, allocate new one. 1084 * If there is one but it doesn't have enough space to store the 1085 * jumbo payload option, allocate a cluster to store the whole options. 1086 * Otherwise, use it to store the options. 1087 */ 1088 if (exthdrs->ip6e_hbh == 0) { 1089 mopt = m_get(M_NOWAIT, MT_DATA); 1090 if (mopt == NULL) 1091 return (ENOBUFS); 1092 mopt->m_len = JUMBOOPTLEN; 1093 optbuf = mtod(mopt, u_char *); 1094 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1095 exthdrs->ip6e_hbh = mopt; 1096 } else { 1097 struct ip6_hbh *hbh; 1098 1099 mopt = exthdrs->ip6e_hbh; 1100 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1101 /* 1102 * XXX assumption: 1103 * - exthdrs->ip6e_hbh is not referenced from places 1104 * other than exthdrs. 1105 * - exthdrs->ip6e_hbh is not an mbuf chain. 1106 */ 1107 int oldoptlen = mopt->m_len; 1108 struct mbuf *n; 1109 1110 /* 1111 * XXX: give up if the whole (new) hbh header does 1112 * not fit even in an mbuf cluster. 1113 */ 1114 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1115 return (ENOBUFS); 1116 1117 /* 1118 * As a consequence, we must always prepare a cluster 1119 * at this point. 1120 */ 1121 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1122 if (n == NULL) 1123 return (ENOBUFS); 1124 n->m_len = oldoptlen + JUMBOOPTLEN; 1125 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1126 oldoptlen); 1127 optbuf = mtod(n, caddr_t) + oldoptlen; 1128 m_freem(mopt); 1129 mopt = exthdrs->ip6e_hbh = n; 1130 } else { 1131 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1132 mopt->m_len += JUMBOOPTLEN; 1133 } 1134 optbuf[0] = IP6OPT_PADN; 1135 optbuf[1] = 1; 1136 1137 /* 1138 * Adjust the header length according to the pad and 1139 * the jumbo payload option. 1140 */ 1141 hbh = mtod(mopt, struct ip6_hbh *); 1142 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1143 } 1144 1145 /* fill in the option. */ 1146 optbuf[2] = IP6OPT_JUMBO; 1147 optbuf[3] = 4; 1148 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1149 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1150 1151 /* finally, adjust the packet header length */ 1152 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1153 1154 return (0); 1155#undef JUMBOOPTLEN 1156} 1157 1158/* 1159 * Insert fragment header and copy unfragmentable header portions. 1160 */ 1161static int 1162ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1163 struct ip6_frag **frghdrp) 1164{ 1165 struct mbuf *n, *mlast; 1166 1167 if (hlen > sizeof(struct ip6_hdr)) { 1168 n = m_copym(m0, sizeof(struct ip6_hdr), 1169 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1170 if (n == 0) 1171 return (ENOBUFS); 1172 m->m_next = n; 1173 } else 1174 n = m; 1175 1176 /* Search for the last mbuf of unfragmentable part. */ 1177 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1178 ; 1179 1180 if ((mlast->m_flags & M_EXT) == 0 && 1181 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1182 /* use the trailing space of the last mbuf for the fragment hdr */ 1183 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1184 mlast->m_len); 1185 mlast->m_len += sizeof(struct ip6_frag); 1186 m->m_pkthdr.len += sizeof(struct ip6_frag); 1187 } else { 1188 /* allocate a new mbuf for the fragment header */ 1189 struct mbuf *mfrg; 1190 1191 mfrg = m_get(M_NOWAIT, MT_DATA); 1192 if (mfrg == NULL) 1193 return (ENOBUFS); 1194 mfrg->m_len = sizeof(struct ip6_frag); 1195 *frghdrp = mtod(mfrg, struct ip6_frag *); 1196 mlast->m_next = mfrg; 1197 } 1198 1199 return (0); 1200} 1201 1202static int 1203ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1204 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1205 int *alwaysfragp, u_int fibnum) 1206{ 1207 u_int32_t mtu = 0; 1208 int alwaysfrag = 0; 1209 int error = 0; 1210 1211 if (ro_pmtu != ro) { 1212 /* The first hop and the final destination may differ. */ 1213 struct sockaddr_in6 *sa6_dst = 1214 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1215 if (ro_pmtu->ro_rt && 1216 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1217 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1218 RTFREE(ro_pmtu->ro_rt); 1219 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1220 } 1221 if (ro_pmtu->ro_rt == NULL) { 1222 bzero(sa6_dst, sizeof(*sa6_dst)); 1223 sa6_dst->sin6_family = AF_INET6; 1224 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1225 sa6_dst->sin6_addr = *dst; 1226 1227 in6_rtalloc(ro_pmtu, fibnum); 1228 } 1229 } 1230 if (ro_pmtu->ro_rt) { 1231 u_int32_t ifmtu; 1232 struct in_conninfo inc; 1233 1234 bzero(&inc, sizeof(inc)); 1235 inc.inc_flags |= INC_ISIPV6; 1236 inc.inc6_faddr = *dst; 1237 1238 if (ifp == NULL) 1239 ifp = ro_pmtu->ro_rt->rt_ifp; 1240 ifmtu = IN6_LINKMTU(ifp); 1241 mtu = tcp_hc_getmtu(&inc); 1242 if (mtu) 1243 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu); 1244 else 1245 mtu = ro_pmtu->ro_rt->rt_mtu; 1246 if (mtu == 0) 1247 mtu = ifmtu; 1248 else if (mtu < IPV6_MMTU) { 1249 /* 1250 * RFC2460 section 5, last paragraph: 1251 * if we record ICMPv6 too big message with 1252 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1253 * or smaller, with framgent header attached. 1254 * (fragment header is needed regardless from the 1255 * packet size, for translators to identify packets) 1256 */ 1257 alwaysfrag = 1; 1258 mtu = IPV6_MMTU; 1259 } else if (mtu > ifmtu) { 1260 /* 1261 * The MTU on the route is larger than the MTU on 1262 * the interface! This shouldn't happen, unless the 1263 * MTU of the interface has been changed after the 1264 * interface was brought up. Change the MTU in the 1265 * route to match the interface MTU (as long as the 1266 * field isn't locked). 1267 */ 1268 mtu = ifmtu; 1269 ro_pmtu->ro_rt->rt_mtu = mtu; 1270 } 1271 } else if (ifp) { 1272 mtu = IN6_LINKMTU(ifp); 1273 } else 1274 error = EHOSTUNREACH; /* XXX */ 1275 1276 *mtup = mtu; 1277 if (alwaysfragp) 1278 *alwaysfragp = alwaysfrag; 1279 return (error); 1280} 1281 1282/* 1283 * IP6 socket option processing. 1284 */ 1285int 1286ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1287{ 1288 int optdatalen, uproto; 1289 void *optdata; 1290 struct inpcb *in6p = sotoinpcb(so); 1291 int error, optval; 1292 int level, op, optname; 1293 int optlen; 1294 struct thread *td; 1295 1296 level = sopt->sopt_level; 1297 op = sopt->sopt_dir; 1298 optname = sopt->sopt_name; 1299 optlen = sopt->sopt_valsize; 1300 td = sopt->sopt_td; 1301 error = 0; 1302 optval = 0; 1303 uproto = (int)so->so_proto->pr_protocol; 1304 1305 if (level != IPPROTO_IPV6) { 1306 error = EINVAL; 1307 1308 if (sopt->sopt_level == SOL_SOCKET && 1309 sopt->sopt_dir == SOPT_SET) { 1310 switch (sopt->sopt_name) { 1311 case SO_REUSEADDR: 1312 INP_WLOCK(in6p); 1313 if ((so->so_options & SO_REUSEADDR) != 0) 1314 in6p->inp_flags2 |= INP_REUSEADDR; 1315 else 1316 in6p->inp_flags2 &= ~INP_REUSEADDR; 1317 INP_WUNLOCK(in6p); 1318 error = 0; 1319 break; 1320 case SO_REUSEPORT: 1321 INP_WLOCK(in6p); 1322 if ((so->so_options & SO_REUSEPORT) != 0) 1323 in6p->inp_flags2 |= INP_REUSEPORT; 1324 else 1325 in6p->inp_flags2 &= ~INP_REUSEPORT; 1326 INP_WUNLOCK(in6p); 1327 error = 0; 1328 break; 1329 case SO_SETFIB: 1330 INP_WLOCK(in6p); 1331 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1332 INP_WUNLOCK(in6p); 1333 error = 0; 1334 break; 1335 default: 1336 break; 1337 } 1338 } 1339 } else { /* level == IPPROTO_IPV6 */ 1340 switch (op) { 1341 1342 case SOPT_SET: 1343 switch (optname) { 1344 case IPV6_2292PKTOPTIONS: 1345#ifdef IPV6_PKTOPTIONS 1346 case IPV6_PKTOPTIONS: 1347#endif 1348 { 1349 struct mbuf *m; 1350 1351 error = soopt_getm(sopt, &m); /* XXX */ 1352 if (error != 0) 1353 break; 1354 error = soopt_mcopyin(sopt, m); /* XXX */ 1355 if (error != 0) 1356 break; 1357 error = ip6_pcbopts(&in6p->in6p_outputopts, 1358 m, so, sopt); 1359 m_freem(m); /* XXX */ 1360 break; 1361 } 1362 1363 /* 1364 * Use of some Hop-by-Hop options or some 1365 * Destination options, might require special 1366 * privilege. That is, normal applications 1367 * (without special privilege) might be forbidden 1368 * from setting certain options in outgoing packets, 1369 * and might never see certain options in received 1370 * packets. [RFC 2292 Section 6] 1371 * KAME specific note: 1372 * KAME prevents non-privileged users from sending or 1373 * receiving ANY hbh/dst options in order to avoid 1374 * overhead of parsing options in the kernel. 1375 */ 1376 case IPV6_RECVHOPOPTS: 1377 case IPV6_RECVDSTOPTS: 1378 case IPV6_RECVRTHDRDSTOPTS: 1379 if (td != NULL) { 1380 error = priv_check(td, 1381 PRIV_NETINET_SETHDROPTS); 1382 if (error) 1383 break; 1384 } 1385 /* FALLTHROUGH */ 1386 case IPV6_UNICAST_HOPS: 1387 case IPV6_HOPLIMIT: 1388 case IPV6_FAITH: 1389 1390 case IPV6_RECVPKTINFO: 1391 case IPV6_RECVHOPLIMIT: 1392 case IPV6_RECVRTHDR: 1393 case IPV6_RECVPATHMTU: 1394 case IPV6_RECVTCLASS: 1395 case IPV6_V6ONLY: 1396 case IPV6_AUTOFLOWLABEL: 1397 case IPV6_BINDANY: 1398 if (optname == IPV6_BINDANY && td != NULL) { 1399 error = priv_check(td, 1400 PRIV_NETINET_BINDANY); 1401 if (error) 1402 break; 1403 } 1404 1405 if (optlen != sizeof(int)) { 1406 error = EINVAL; 1407 break; 1408 } 1409 error = sooptcopyin(sopt, &optval, 1410 sizeof optval, sizeof optval); 1411 if (error) 1412 break; 1413 switch (optname) { 1414 1415 case IPV6_UNICAST_HOPS: 1416 if (optval < -1 || optval >= 256) 1417 error = EINVAL; 1418 else { 1419 /* -1 = kernel default */ 1420 in6p->in6p_hops = optval; 1421 if ((in6p->inp_vflag & 1422 INP_IPV4) != 0) 1423 in6p->inp_ip_ttl = optval; 1424 } 1425 break; 1426#define OPTSET(bit) \ 1427do { \ 1428 INP_WLOCK(in6p); \ 1429 if (optval) \ 1430 in6p->inp_flags |= (bit); \ 1431 else \ 1432 in6p->inp_flags &= ~(bit); \ 1433 INP_WUNLOCK(in6p); \ 1434} while (/*CONSTCOND*/ 0) 1435#define OPTSET2292(bit) \ 1436do { \ 1437 INP_WLOCK(in6p); \ 1438 in6p->inp_flags |= IN6P_RFC2292; \ 1439 if (optval) \ 1440 in6p->inp_flags |= (bit); \ 1441 else \ 1442 in6p->inp_flags &= ~(bit); \ 1443 INP_WUNLOCK(in6p); \ 1444} while (/*CONSTCOND*/ 0) 1445#define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1446 1447 case IPV6_RECVPKTINFO: 1448 /* cannot mix with RFC2292 */ 1449 if (OPTBIT(IN6P_RFC2292)) { 1450 error = EINVAL; 1451 break; 1452 } 1453 OPTSET(IN6P_PKTINFO); 1454 break; 1455 1456 case IPV6_HOPLIMIT: 1457 { 1458 struct ip6_pktopts **optp; 1459 1460 /* cannot mix with RFC2292 */ 1461 if (OPTBIT(IN6P_RFC2292)) { 1462 error = EINVAL; 1463 break; 1464 } 1465 optp = &in6p->in6p_outputopts; 1466 error = ip6_pcbopt(IPV6_HOPLIMIT, 1467 (u_char *)&optval, sizeof(optval), 1468 optp, (td != NULL) ? td->td_ucred : 1469 NULL, uproto); 1470 break; 1471 } 1472 1473 case IPV6_RECVHOPLIMIT: 1474 /* cannot mix with RFC2292 */ 1475 if (OPTBIT(IN6P_RFC2292)) { 1476 error = EINVAL; 1477 break; 1478 } 1479 OPTSET(IN6P_HOPLIMIT); 1480 break; 1481 1482 case IPV6_RECVHOPOPTS: 1483 /* cannot mix with RFC2292 */ 1484 if (OPTBIT(IN6P_RFC2292)) { 1485 error = EINVAL; 1486 break; 1487 } 1488 OPTSET(IN6P_HOPOPTS); 1489 break; 1490 1491 case IPV6_RECVDSTOPTS: 1492 /* cannot mix with RFC2292 */ 1493 if (OPTBIT(IN6P_RFC2292)) { 1494 error = EINVAL; 1495 break; 1496 } 1497 OPTSET(IN6P_DSTOPTS); 1498 break; 1499 1500 case IPV6_RECVRTHDRDSTOPTS: 1501 /* cannot mix with RFC2292 */ 1502 if (OPTBIT(IN6P_RFC2292)) { 1503 error = EINVAL; 1504 break; 1505 } 1506 OPTSET(IN6P_RTHDRDSTOPTS); 1507 break; 1508 1509 case IPV6_RECVRTHDR: 1510 /* cannot mix with RFC2292 */ 1511 if (OPTBIT(IN6P_RFC2292)) { 1512 error = EINVAL; 1513 break; 1514 } 1515 OPTSET(IN6P_RTHDR); 1516 break; 1517 1518 case IPV6_FAITH: 1519 OPTSET(INP_FAITH); 1520 break; 1521 1522 case IPV6_RECVPATHMTU: 1523 /* 1524 * We ignore this option for TCP 1525 * sockets. 1526 * (RFC3542 leaves this case 1527 * unspecified.) 1528 */ 1529 if (uproto != IPPROTO_TCP) 1530 OPTSET(IN6P_MTU); 1531 break; 1532 1533 case IPV6_V6ONLY: 1534 /* 1535 * make setsockopt(IPV6_V6ONLY) 1536 * available only prior to bind(2). 1537 * see ipng mailing list, Jun 22 2001. 1538 */ 1539 if (in6p->inp_lport || 1540 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1541 error = EINVAL; 1542 break; 1543 } 1544 OPTSET(IN6P_IPV6_V6ONLY); 1545 if (optval) 1546 in6p->inp_vflag &= ~INP_IPV4; 1547 else 1548 in6p->inp_vflag |= INP_IPV4; 1549 break; 1550 case IPV6_RECVTCLASS: 1551 /* cannot mix with RFC2292 XXX */ 1552 if (OPTBIT(IN6P_RFC2292)) { 1553 error = EINVAL; 1554 break; 1555 } 1556 OPTSET(IN6P_TCLASS); 1557 break; 1558 case IPV6_AUTOFLOWLABEL: 1559 OPTSET(IN6P_AUTOFLOWLABEL); 1560 break; 1561 1562 case IPV6_BINDANY: 1563 OPTSET(INP_BINDANY); 1564 break; 1565 } 1566 break; 1567 1568 case IPV6_TCLASS: 1569 case IPV6_DONTFRAG: 1570 case IPV6_USE_MIN_MTU: 1571 case IPV6_PREFER_TEMPADDR: 1572 if (optlen != sizeof(optval)) { 1573 error = EINVAL; 1574 break; 1575 } 1576 error = sooptcopyin(sopt, &optval, 1577 sizeof optval, sizeof optval); 1578 if (error) 1579 break; 1580 { 1581 struct ip6_pktopts **optp; 1582 optp = &in6p->in6p_outputopts; 1583 error = ip6_pcbopt(optname, 1584 (u_char *)&optval, sizeof(optval), 1585 optp, (td != NULL) ? td->td_ucred : 1586 NULL, uproto); 1587 break; 1588 } 1589 1590 case IPV6_2292PKTINFO: 1591 case IPV6_2292HOPLIMIT: 1592 case IPV6_2292HOPOPTS: 1593 case IPV6_2292DSTOPTS: 1594 case IPV6_2292RTHDR: 1595 /* RFC 2292 */ 1596 if (optlen != sizeof(int)) { 1597 error = EINVAL; 1598 break; 1599 } 1600 error = sooptcopyin(sopt, &optval, 1601 sizeof optval, sizeof optval); 1602 if (error) 1603 break; 1604 switch (optname) { 1605 case IPV6_2292PKTINFO: 1606 OPTSET2292(IN6P_PKTINFO); 1607 break; 1608 case IPV6_2292HOPLIMIT: 1609 OPTSET2292(IN6P_HOPLIMIT); 1610 break; 1611 case IPV6_2292HOPOPTS: 1612 /* 1613 * Check super-user privilege. 1614 * See comments for IPV6_RECVHOPOPTS. 1615 */ 1616 if (td != NULL) { 1617 error = priv_check(td, 1618 PRIV_NETINET_SETHDROPTS); 1619 if (error) 1620 return (error); 1621 } 1622 OPTSET2292(IN6P_HOPOPTS); 1623 break; 1624 case IPV6_2292DSTOPTS: 1625 if (td != NULL) { 1626 error = priv_check(td, 1627 PRIV_NETINET_SETHDROPTS); 1628 if (error) 1629 return (error); 1630 } 1631 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1632 break; 1633 case IPV6_2292RTHDR: 1634 OPTSET2292(IN6P_RTHDR); 1635 break; 1636 } 1637 break; 1638 case IPV6_PKTINFO: 1639 case IPV6_HOPOPTS: 1640 case IPV6_RTHDR: 1641 case IPV6_DSTOPTS: 1642 case IPV6_RTHDRDSTOPTS: 1643 case IPV6_NEXTHOP: 1644 { 1645 /* new advanced API (RFC3542) */ 1646 u_char *optbuf; 1647 u_char optbuf_storage[MCLBYTES]; 1648 int optlen; 1649 struct ip6_pktopts **optp; 1650 1651 /* cannot mix with RFC2292 */ 1652 if (OPTBIT(IN6P_RFC2292)) { 1653 error = EINVAL; 1654 break; 1655 } 1656 1657 /* 1658 * We only ensure valsize is not too large 1659 * here. Further validation will be done 1660 * later. 1661 */ 1662 error = sooptcopyin(sopt, optbuf_storage, 1663 sizeof(optbuf_storage), 0); 1664 if (error) 1665 break; 1666 optlen = sopt->sopt_valsize; 1667 optbuf = optbuf_storage; 1668 optp = &in6p->in6p_outputopts; 1669 error = ip6_pcbopt(optname, optbuf, optlen, 1670 optp, (td != NULL) ? td->td_ucred : NULL, 1671 uproto); 1672 break; 1673 } 1674#undef OPTSET 1675 1676 case IPV6_MULTICAST_IF: 1677 case IPV6_MULTICAST_HOPS: 1678 case IPV6_MULTICAST_LOOP: 1679 case IPV6_JOIN_GROUP: 1680 case IPV6_LEAVE_GROUP: 1681 case IPV6_MSFILTER: 1682 case MCAST_BLOCK_SOURCE: 1683 case MCAST_UNBLOCK_SOURCE: 1684 case MCAST_JOIN_GROUP: 1685 case MCAST_LEAVE_GROUP: 1686 case MCAST_JOIN_SOURCE_GROUP: 1687 case MCAST_LEAVE_SOURCE_GROUP: 1688 error = ip6_setmoptions(in6p, sopt); 1689 break; 1690 1691 case IPV6_PORTRANGE: 1692 error = sooptcopyin(sopt, &optval, 1693 sizeof optval, sizeof optval); 1694 if (error) 1695 break; 1696 1697 INP_WLOCK(in6p); 1698 switch (optval) { 1699 case IPV6_PORTRANGE_DEFAULT: 1700 in6p->inp_flags &= ~(INP_LOWPORT); 1701 in6p->inp_flags &= ~(INP_HIGHPORT); 1702 break; 1703 1704 case IPV6_PORTRANGE_HIGH: 1705 in6p->inp_flags &= ~(INP_LOWPORT); 1706 in6p->inp_flags |= INP_HIGHPORT; 1707 break; 1708 1709 case IPV6_PORTRANGE_LOW: 1710 in6p->inp_flags &= ~(INP_HIGHPORT); 1711 in6p->inp_flags |= INP_LOWPORT; 1712 break; 1713 1714 default: 1715 error = EINVAL; 1716 break; 1717 } 1718 INP_WUNLOCK(in6p); 1719 break; 1720 1721#ifdef IPSEC 1722 case IPV6_IPSEC_POLICY: 1723 { 1724 caddr_t req; 1725 struct mbuf *m; 1726 1727 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1728 break; 1729 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1730 break; 1731 req = mtod(m, caddr_t); 1732 error = ipsec_set_policy(in6p, optname, req, 1733 m->m_len, (sopt->sopt_td != NULL) ? 1734 sopt->sopt_td->td_ucred : NULL); 1735 m_freem(m); 1736 break; 1737 } 1738#endif /* IPSEC */ 1739 1740 default: 1741 error = ENOPROTOOPT; 1742 break; 1743 } 1744 break; 1745 1746 case SOPT_GET: 1747 switch (optname) { 1748 1749 case IPV6_2292PKTOPTIONS: 1750#ifdef IPV6_PKTOPTIONS 1751 case IPV6_PKTOPTIONS: 1752#endif 1753 /* 1754 * RFC3542 (effectively) deprecated the 1755 * semantics of the 2292-style pktoptions. 1756 * Since it was not reliable in nature (i.e., 1757 * applications had to expect the lack of some 1758 * information after all), it would make sense 1759 * to simplify this part by always returning 1760 * empty data. 1761 */ 1762 sopt->sopt_valsize = 0; 1763 break; 1764 1765 case IPV6_RECVHOPOPTS: 1766 case IPV6_RECVDSTOPTS: 1767 case IPV6_RECVRTHDRDSTOPTS: 1768 case IPV6_UNICAST_HOPS: 1769 case IPV6_RECVPKTINFO: 1770 case IPV6_RECVHOPLIMIT: 1771 case IPV6_RECVRTHDR: 1772 case IPV6_RECVPATHMTU: 1773 1774 case IPV6_FAITH: 1775 case IPV6_V6ONLY: 1776 case IPV6_PORTRANGE: 1777 case IPV6_RECVTCLASS: 1778 case IPV6_AUTOFLOWLABEL: 1779 case IPV6_BINDANY: 1780 switch (optname) { 1781 1782 case IPV6_RECVHOPOPTS: 1783 optval = OPTBIT(IN6P_HOPOPTS); 1784 break; 1785 1786 case IPV6_RECVDSTOPTS: 1787 optval = OPTBIT(IN6P_DSTOPTS); 1788 break; 1789 1790 case IPV6_RECVRTHDRDSTOPTS: 1791 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1792 break; 1793 1794 case IPV6_UNICAST_HOPS: 1795 optval = in6p->in6p_hops; 1796 break; 1797 1798 case IPV6_RECVPKTINFO: 1799 optval = OPTBIT(IN6P_PKTINFO); 1800 break; 1801 1802 case IPV6_RECVHOPLIMIT: 1803 optval = OPTBIT(IN6P_HOPLIMIT); 1804 break; 1805 1806 case IPV6_RECVRTHDR: 1807 optval = OPTBIT(IN6P_RTHDR); 1808 break; 1809 1810 case IPV6_RECVPATHMTU: 1811 optval = OPTBIT(IN6P_MTU); 1812 break; 1813 1814 case IPV6_FAITH: 1815 optval = OPTBIT(INP_FAITH); 1816 break; 1817 1818 case IPV6_V6ONLY: 1819 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1820 break; 1821 1822 case IPV6_PORTRANGE: 1823 { 1824 int flags; 1825 flags = in6p->inp_flags; 1826 if (flags & INP_HIGHPORT) 1827 optval = IPV6_PORTRANGE_HIGH; 1828 else if (flags & INP_LOWPORT) 1829 optval = IPV6_PORTRANGE_LOW; 1830 else 1831 optval = 0; 1832 break; 1833 } 1834 case IPV6_RECVTCLASS: 1835 optval = OPTBIT(IN6P_TCLASS); 1836 break; 1837 1838 case IPV6_AUTOFLOWLABEL: 1839 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1840 break; 1841 1842 case IPV6_BINDANY: 1843 optval = OPTBIT(INP_BINDANY); 1844 break; 1845 } 1846 if (error) 1847 break; 1848 error = sooptcopyout(sopt, &optval, 1849 sizeof optval); 1850 break; 1851 1852 case IPV6_PATHMTU: 1853 { 1854 u_long pmtu = 0; 1855 struct ip6_mtuinfo mtuinfo; 1856 struct route_in6 sro; 1857 1858 bzero(&sro, sizeof(sro)); 1859 1860 if (!(so->so_state & SS_ISCONNECTED)) 1861 return (ENOTCONN); 1862 /* 1863 * XXX: we dot not consider the case of source 1864 * routing, or optional information to specify 1865 * the outgoing interface. 1866 */ 1867 error = ip6_getpmtu(&sro, NULL, NULL, 1868 &in6p->in6p_faddr, &pmtu, NULL, 1869 so->so_fibnum); 1870 if (sro.ro_rt) 1871 RTFREE(sro.ro_rt); 1872 if (error) 1873 break; 1874 if (pmtu > IPV6_MAXPACKET) 1875 pmtu = IPV6_MAXPACKET; 1876 1877 bzero(&mtuinfo, sizeof(mtuinfo)); 1878 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1879 optdata = (void *)&mtuinfo; 1880 optdatalen = sizeof(mtuinfo); 1881 error = sooptcopyout(sopt, optdata, 1882 optdatalen); 1883 break; 1884 } 1885 1886 case IPV6_2292PKTINFO: 1887 case IPV6_2292HOPLIMIT: 1888 case IPV6_2292HOPOPTS: 1889 case IPV6_2292RTHDR: 1890 case IPV6_2292DSTOPTS: 1891 switch (optname) { 1892 case IPV6_2292PKTINFO: 1893 optval = OPTBIT(IN6P_PKTINFO); 1894 break; 1895 case IPV6_2292HOPLIMIT: 1896 optval = OPTBIT(IN6P_HOPLIMIT); 1897 break; 1898 case IPV6_2292HOPOPTS: 1899 optval = OPTBIT(IN6P_HOPOPTS); 1900 break; 1901 case IPV6_2292RTHDR: 1902 optval = OPTBIT(IN6P_RTHDR); 1903 break; 1904 case IPV6_2292DSTOPTS: 1905 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1906 break; 1907 } 1908 error = sooptcopyout(sopt, &optval, 1909 sizeof optval); 1910 break; 1911 case IPV6_PKTINFO: 1912 case IPV6_HOPOPTS: 1913 case IPV6_RTHDR: 1914 case IPV6_DSTOPTS: 1915 case IPV6_RTHDRDSTOPTS: 1916 case IPV6_NEXTHOP: 1917 case IPV6_TCLASS: 1918 case IPV6_DONTFRAG: 1919 case IPV6_USE_MIN_MTU: 1920 case IPV6_PREFER_TEMPADDR: 1921 error = ip6_getpcbopt(in6p->in6p_outputopts, 1922 optname, sopt); 1923 break; 1924 1925 case IPV6_MULTICAST_IF: 1926 case IPV6_MULTICAST_HOPS: 1927 case IPV6_MULTICAST_LOOP: 1928 case IPV6_MSFILTER: 1929 error = ip6_getmoptions(in6p, sopt); 1930 break; 1931 1932#ifdef IPSEC 1933 case IPV6_IPSEC_POLICY: 1934 { 1935 caddr_t req = NULL; 1936 size_t len = 0; 1937 struct mbuf *m = NULL; 1938 struct mbuf **mp = &m; 1939 size_t ovalsize = sopt->sopt_valsize; 1940 caddr_t oval = (caddr_t)sopt->sopt_val; 1941 1942 error = soopt_getm(sopt, &m); /* XXX */ 1943 if (error != 0) 1944 break; 1945 error = soopt_mcopyin(sopt, m); /* XXX */ 1946 if (error != 0) 1947 break; 1948 sopt->sopt_valsize = ovalsize; 1949 sopt->sopt_val = oval; 1950 if (m) { 1951 req = mtod(m, caddr_t); 1952 len = m->m_len; 1953 } 1954 error = ipsec_get_policy(in6p, req, len, mp); 1955 if (error == 0) 1956 error = soopt_mcopyout(sopt, m); /* XXX */ 1957 if (error == 0 && m) 1958 m_freem(m); 1959 break; 1960 } 1961#endif /* IPSEC */ 1962 1963 default: 1964 error = ENOPROTOOPT; 1965 break; 1966 } 1967 break; 1968 } 1969 } 1970 return (error); 1971} 1972 1973int 1974ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1975{ 1976 int error = 0, optval, optlen; 1977 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1978 struct inpcb *in6p = sotoinpcb(so); 1979 int level, op, optname; 1980 1981 level = sopt->sopt_level; 1982 op = sopt->sopt_dir; 1983 optname = sopt->sopt_name; 1984 optlen = sopt->sopt_valsize; 1985 1986 if (level != IPPROTO_IPV6) { 1987 return (EINVAL); 1988 } 1989 1990 switch (optname) { 1991 case IPV6_CHECKSUM: 1992 /* 1993 * For ICMPv6 sockets, no modification allowed for checksum 1994 * offset, permit "no change" values to help existing apps. 1995 * 1996 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 1997 * for an ICMPv6 socket will fail." 1998 * The current behavior does not meet RFC3542. 1999 */ 2000 switch (op) { 2001 case SOPT_SET: 2002 if (optlen != sizeof(int)) { 2003 error = EINVAL; 2004 break; 2005 } 2006 error = sooptcopyin(sopt, &optval, sizeof(optval), 2007 sizeof(optval)); 2008 if (error) 2009 break; 2010 if ((optval % 2) != 0) { 2011 /* the API assumes even offset values */ 2012 error = EINVAL; 2013 } else if (so->so_proto->pr_protocol == 2014 IPPROTO_ICMPV6) { 2015 if (optval != icmp6off) 2016 error = EINVAL; 2017 } else 2018 in6p->in6p_cksum = optval; 2019 break; 2020 2021 case SOPT_GET: 2022 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2023 optval = icmp6off; 2024 else 2025 optval = in6p->in6p_cksum; 2026 2027 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2028 break; 2029 2030 default: 2031 error = EINVAL; 2032 break; 2033 } 2034 break; 2035 2036 default: 2037 error = ENOPROTOOPT; 2038 break; 2039 } 2040 2041 return (error); 2042} 2043 2044/* 2045 * Set up IP6 options in pcb for insertion in output packets or 2046 * specifying behavior of outgoing packets. 2047 */ 2048static int 2049ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2050 struct socket *so, struct sockopt *sopt) 2051{ 2052 struct ip6_pktopts *opt = *pktopt; 2053 int error = 0; 2054 struct thread *td = sopt->sopt_td; 2055 2056 /* turn off any old options. */ 2057 if (opt) { 2058#ifdef DIAGNOSTIC 2059 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2060 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2061 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2062 printf("ip6_pcbopts: all specified options are cleared.\n"); 2063#endif 2064 ip6_clearpktopts(opt, -1); 2065 } else 2066 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2067 *pktopt = NULL; 2068 2069 if (!m || m->m_len == 0) { 2070 /* 2071 * Only turning off any previous options, regardless of 2072 * whether the opt is just created or given. 2073 */ 2074 free(opt, M_IP6OPT); 2075 return (0); 2076 } 2077 2078 /* set options specified by user. */ 2079 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2080 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2081 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2082 free(opt, M_IP6OPT); 2083 return (error); 2084 } 2085 *pktopt = opt; 2086 return (0); 2087} 2088 2089/* 2090 * initialize ip6_pktopts. beware that there are non-zero default values in 2091 * the struct. 2092 */ 2093void 2094ip6_initpktopts(struct ip6_pktopts *opt) 2095{ 2096 2097 bzero(opt, sizeof(*opt)); 2098 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2099 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2100 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2101 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2102} 2103 2104static int 2105ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2106 struct ucred *cred, int uproto) 2107{ 2108 struct ip6_pktopts *opt; 2109 2110 if (*pktopt == NULL) { 2111 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2112 M_WAITOK); 2113 ip6_initpktopts(*pktopt); 2114 } 2115 opt = *pktopt; 2116 2117 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2118} 2119 2120static int 2121ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2122{ 2123 void *optdata = NULL; 2124 int optdatalen = 0; 2125 struct ip6_ext *ip6e; 2126 int error = 0; 2127 struct in6_pktinfo null_pktinfo; 2128 int deftclass = 0, on; 2129 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2130 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2131 2132 switch (optname) { 2133 case IPV6_PKTINFO: 2134 if (pktopt && pktopt->ip6po_pktinfo) 2135 optdata = (void *)pktopt->ip6po_pktinfo; 2136 else { 2137 /* XXX: we don't have to do this every time... */ 2138 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2139 optdata = (void *)&null_pktinfo; 2140 } 2141 optdatalen = sizeof(struct in6_pktinfo); 2142 break; 2143 case IPV6_TCLASS: 2144 if (pktopt && pktopt->ip6po_tclass >= 0) 2145 optdata = (void *)&pktopt->ip6po_tclass; 2146 else 2147 optdata = (void *)&deftclass; 2148 optdatalen = sizeof(int); 2149 break; 2150 case IPV6_HOPOPTS: 2151 if (pktopt && pktopt->ip6po_hbh) { 2152 optdata = (void *)pktopt->ip6po_hbh; 2153 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2154 optdatalen = (ip6e->ip6e_len + 1) << 3; 2155 } 2156 break; 2157 case IPV6_RTHDR: 2158 if (pktopt && pktopt->ip6po_rthdr) { 2159 optdata = (void *)pktopt->ip6po_rthdr; 2160 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2161 optdatalen = (ip6e->ip6e_len + 1) << 3; 2162 } 2163 break; 2164 case IPV6_RTHDRDSTOPTS: 2165 if (pktopt && pktopt->ip6po_dest1) { 2166 optdata = (void *)pktopt->ip6po_dest1; 2167 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2168 optdatalen = (ip6e->ip6e_len + 1) << 3; 2169 } 2170 break; 2171 case IPV6_DSTOPTS: 2172 if (pktopt && pktopt->ip6po_dest2) { 2173 optdata = (void *)pktopt->ip6po_dest2; 2174 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2175 optdatalen = (ip6e->ip6e_len + 1) << 3; 2176 } 2177 break; 2178 case IPV6_NEXTHOP: 2179 if (pktopt && pktopt->ip6po_nexthop) { 2180 optdata = (void *)pktopt->ip6po_nexthop; 2181 optdatalen = pktopt->ip6po_nexthop->sa_len; 2182 } 2183 break; 2184 case IPV6_USE_MIN_MTU: 2185 if (pktopt) 2186 optdata = (void *)&pktopt->ip6po_minmtu; 2187 else 2188 optdata = (void *)&defminmtu; 2189 optdatalen = sizeof(int); 2190 break; 2191 case IPV6_DONTFRAG: 2192 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2193 on = 1; 2194 else 2195 on = 0; 2196 optdata = (void *)&on; 2197 optdatalen = sizeof(on); 2198 break; 2199 case IPV6_PREFER_TEMPADDR: 2200 if (pktopt) 2201 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2202 else 2203 optdata = (void *)&defpreftemp; 2204 optdatalen = sizeof(int); 2205 break; 2206 default: /* should not happen */ 2207#ifdef DIAGNOSTIC 2208 panic("ip6_getpcbopt: unexpected option\n"); 2209#endif 2210 return (ENOPROTOOPT); 2211 } 2212 2213 error = sooptcopyout(sopt, optdata, optdatalen); 2214 2215 return (error); 2216} 2217 2218void 2219ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2220{ 2221 if (pktopt == NULL) 2222 return; 2223 2224 if (optname == -1 || optname == IPV6_PKTINFO) { 2225 if (pktopt->ip6po_pktinfo) 2226 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2227 pktopt->ip6po_pktinfo = NULL; 2228 } 2229 if (optname == -1 || optname == IPV6_HOPLIMIT) 2230 pktopt->ip6po_hlim = -1; 2231 if (optname == -1 || optname == IPV6_TCLASS) 2232 pktopt->ip6po_tclass = -1; 2233 if (optname == -1 || optname == IPV6_NEXTHOP) { 2234 if (pktopt->ip6po_nextroute.ro_rt) { 2235 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2236 pktopt->ip6po_nextroute.ro_rt = NULL; 2237 } 2238 if (pktopt->ip6po_nexthop) 2239 free(pktopt->ip6po_nexthop, M_IP6OPT); 2240 pktopt->ip6po_nexthop = NULL; 2241 } 2242 if (optname == -1 || optname == IPV6_HOPOPTS) { 2243 if (pktopt->ip6po_hbh) 2244 free(pktopt->ip6po_hbh, M_IP6OPT); 2245 pktopt->ip6po_hbh = NULL; 2246 } 2247 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2248 if (pktopt->ip6po_dest1) 2249 free(pktopt->ip6po_dest1, M_IP6OPT); 2250 pktopt->ip6po_dest1 = NULL; 2251 } 2252 if (optname == -1 || optname == IPV6_RTHDR) { 2253 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2254 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2255 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2256 if (pktopt->ip6po_route.ro_rt) { 2257 RTFREE(pktopt->ip6po_route.ro_rt); 2258 pktopt->ip6po_route.ro_rt = NULL; 2259 } 2260 } 2261 if (optname == -1 || optname == IPV6_DSTOPTS) { 2262 if (pktopt->ip6po_dest2) 2263 free(pktopt->ip6po_dest2, M_IP6OPT); 2264 pktopt->ip6po_dest2 = NULL; 2265 } 2266} 2267 2268#define PKTOPT_EXTHDRCPY(type) \ 2269do {\ 2270 if (src->type) {\ 2271 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2272 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2273 if (dst->type == NULL && canwait == M_NOWAIT)\ 2274 goto bad;\ 2275 bcopy(src->type, dst->type, hlen);\ 2276 }\ 2277} while (/*CONSTCOND*/ 0) 2278 2279static int 2280copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2281{ 2282 if (dst == NULL || src == NULL) { 2283 printf("ip6_clearpktopts: invalid argument\n"); 2284 return (EINVAL); 2285 } 2286 2287 dst->ip6po_hlim = src->ip6po_hlim; 2288 dst->ip6po_tclass = src->ip6po_tclass; 2289 dst->ip6po_flags = src->ip6po_flags; 2290 dst->ip6po_minmtu = src->ip6po_minmtu; 2291 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2292 if (src->ip6po_pktinfo) { 2293 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2294 M_IP6OPT, canwait); 2295 if (dst->ip6po_pktinfo == NULL) 2296 goto bad; 2297 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2298 } 2299 if (src->ip6po_nexthop) { 2300 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2301 M_IP6OPT, canwait); 2302 if (dst->ip6po_nexthop == NULL) 2303 goto bad; 2304 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2305 src->ip6po_nexthop->sa_len); 2306 } 2307 PKTOPT_EXTHDRCPY(ip6po_hbh); 2308 PKTOPT_EXTHDRCPY(ip6po_dest1); 2309 PKTOPT_EXTHDRCPY(ip6po_dest2); 2310 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2311 return (0); 2312 2313 bad: 2314 ip6_clearpktopts(dst, -1); 2315 return (ENOBUFS); 2316} 2317#undef PKTOPT_EXTHDRCPY 2318 2319struct ip6_pktopts * 2320ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2321{ 2322 int error; 2323 struct ip6_pktopts *dst; 2324 2325 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2326 if (dst == NULL) 2327 return (NULL); 2328 ip6_initpktopts(dst); 2329 2330 if ((error = copypktopts(dst, src, canwait)) != 0) { 2331 free(dst, M_IP6OPT); 2332 return (NULL); 2333 } 2334 2335 return (dst); 2336} 2337 2338void 2339ip6_freepcbopts(struct ip6_pktopts *pktopt) 2340{ 2341 if (pktopt == NULL) 2342 return; 2343 2344 ip6_clearpktopts(pktopt, -1); 2345 2346 free(pktopt, M_IP6OPT); 2347} 2348 2349/* 2350 * Set IPv6 outgoing packet options based on advanced API. 2351 */ 2352int 2353ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2354 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2355{ 2356 struct cmsghdr *cm = 0; 2357 2358 if (control == NULL || opt == NULL) 2359 return (EINVAL); 2360 2361 ip6_initpktopts(opt); 2362 if (stickyopt) { 2363 int error; 2364 2365 /* 2366 * If stickyopt is provided, make a local copy of the options 2367 * for this particular packet, then override them by ancillary 2368 * objects. 2369 * XXX: copypktopts() does not copy the cached route to a next 2370 * hop (if any). This is not very good in terms of efficiency, 2371 * but we can allow this since this option should be rarely 2372 * used. 2373 */ 2374 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2375 return (error); 2376 } 2377 2378 /* 2379 * XXX: Currently, we assume all the optional information is stored 2380 * in a single mbuf. 2381 */ 2382 if (control->m_next) 2383 return (EINVAL); 2384 2385 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2386 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2387 int error; 2388 2389 if (control->m_len < CMSG_LEN(0)) 2390 return (EINVAL); 2391 2392 cm = mtod(control, struct cmsghdr *); 2393 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2394 return (EINVAL); 2395 if (cm->cmsg_level != IPPROTO_IPV6) 2396 continue; 2397 2398 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2399 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2400 if (error) 2401 return (error); 2402 } 2403 2404 return (0); 2405} 2406 2407/* 2408 * Set a particular packet option, as a sticky option or an ancillary data 2409 * item. "len" can be 0 only when it's a sticky option. 2410 * We have 4 cases of combination of "sticky" and "cmsg": 2411 * "sticky=0, cmsg=0": impossible 2412 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2413 * "sticky=1, cmsg=0": RFC3542 socket option 2414 * "sticky=1, cmsg=1": RFC2292 socket option 2415 */ 2416static int 2417ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2418 struct ucred *cred, int sticky, int cmsg, int uproto) 2419{ 2420 int minmtupolicy, preftemp; 2421 int error; 2422 2423 if (!sticky && !cmsg) { 2424#ifdef DIAGNOSTIC 2425 printf("ip6_setpktopt: impossible case\n"); 2426#endif 2427 return (EINVAL); 2428 } 2429 2430 /* 2431 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2432 * not be specified in the context of RFC3542. Conversely, 2433 * RFC3542 types should not be specified in the context of RFC2292. 2434 */ 2435 if (!cmsg) { 2436 switch (optname) { 2437 case IPV6_2292PKTINFO: 2438 case IPV6_2292HOPLIMIT: 2439 case IPV6_2292NEXTHOP: 2440 case IPV6_2292HOPOPTS: 2441 case IPV6_2292DSTOPTS: 2442 case IPV6_2292RTHDR: 2443 case IPV6_2292PKTOPTIONS: 2444 return (ENOPROTOOPT); 2445 } 2446 } 2447 if (sticky && cmsg) { 2448 switch (optname) { 2449 case IPV6_PKTINFO: 2450 case IPV6_HOPLIMIT: 2451 case IPV6_NEXTHOP: 2452 case IPV6_HOPOPTS: 2453 case IPV6_DSTOPTS: 2454 case IPV6_RTHDRDSTOPTS: 2455 case IPV6_RTHDR: 2456 case IPV6_USE_MIN_MTU: 2457 case IPV6_DONTFRAG: 2458 case IPV6_TCLASS: 2459 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2460 return (ENOPROTOOPT); 2461 } 2462 } 2463 2464 switch (optname) { 2465 case IPV6_2292PKTINFO: 2466 case IPV6_PKTINFO: 2467 { 2468 struct ifnet *ifp = NULL; 2469 struct in6_pktinfo *pktinfo; 2470 2471 if (len != sizeof(struct in6_pktinfo)) 2472 return (EINVAL); 2473 2474 pktinfo = (struct in6_pktinfo *)buf; 2475 2476 /* 2477 * An application can clear any sticky IPV6_PKTINFO option by 2478 * doing a "regular" setsockopt with ipi6_addr being 2479 * in6addr_any and ipi6_ifindex being zero. 2480 * [RFC 3542, Section 6] 2481 */ 2482 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2483 pktinfo->ipi6_ifindex == 0 && 2484 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2485 ip6_clearpktopts(opt, optname); 2486 break; 2487 } 2488 2489 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2490 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2491 return (EINVAL); 2492 } 2493 2494 /* validate the interface index if specified. */ 2495 if (pktinfo->ipi6_ifindex > V_if_index || 2496 pktinfo->ipi6_ifindex < 0) { 2497 return (ENXIO); 2498 } 2499 if (pktinfo->ipi6_ifindex) { 2500 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2501 if (ifp == NULL) 2502 return (ENXIO); 2503 } 2504 2505 /* 2506 * We store the address anyway, and let in6_selectsrc() 2507 * validate the specified address. This is because ipi6_addr 2508 * may not have enough information about its scope zone, and 2509 * we may need additional information (such as outgoing 2510 * interface or the scope zone of a destination address) to 2511 * disambiguate the scope. 2512 * XXX: the delay of the validation may confuse the 2513 * application when it is used as a sticky option. 2514 */ 2515 if (opt->ip6po_pktinfo == NULL) { 2516 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2517 M_IP6OPT, M_NOWAIT); 2518 if (opt->ip6po_pktinfo == NULL) 2519 return (ENOBUFS); 2520 } 2521 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2522 break; 2523 } 2524 2525 case IPV6_2292HOPLIMIT: 2526 case IPV6_HOPLIMIT: 2527 { 2528 int *hlimp; 2529 2530 /* 2531 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2532 * to simplify the ordering among hoplimit options. 2533 */ 2534 if (optname == IPV6_HOPLIMIT && sticky) 2535 return (ENOPROTOOPT); 2536 2537 if (len != sizeof(int)) 2538 return (EINVAL); 2539 hlimp = (int *)buf; 2540 if (*hlimp < -1 || *hlimp > 255) 2541 return (EINVAL); 2542 2543 opt->ip6po_hlim = *hlimp; 2544 break; 2545 } 2546 2547 case IPV6_TCLASS: 2548 { 2549 int tclass; 2550 2551 if (len != sizeof(int)) 2552 return (EINVAL); 2553 tclass = *(int *)buf; 2554 if (tclass < -1 || tclass > 255) 2555 return (EINVAL); 2556 2557 opt->ip6po_tclass = tclass; 2558 break; 2559 } 2560 2561 case IPV6_2292NEXTHOP: 2562 case IPV6_NEXTHOP: 2563 if (cred != NULL) { 2564 error = priv_check_cred(cred, 2565 PRIV_NETINET_SETHDROPTS, 0); 2566 if (error) 2567 return (error); 2568 } 2569 2570 if (len == 0) { /* just remove the option */ 2571 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2572 break; 2573 } 2574 2575 /* check if cmsg_len is large enough for sa_len */ 2576 if (len < sizeof(struct sockaddr) || len < *buf) 2577 return (EINVAL); 2578 2579 switch (((struct sockaddr *)buf)->sa_family) { 2580 case AF_INET6: 2581 { 2582 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2583 int error; 2584 2585 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2586 return (EINVAL); 2587 2588 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2589 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2590 return (EINVAL); 2591 } 2592 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2593 != 0) { 2594 return (error); 2595 } 2596 break; 2597 } 2598 case AF_LINK: /* should eventually be supported */ 2599 default: 2600 return (EAFNOSUPPORT); 2601 } 2602 2603 /* turn off the previous option, then set the new option. */ 2604 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2605 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2606 if (opt->ip6po_nexthop == NULL) 2607 return (ENOBUFS); 2608 bcopy(buf, opt->ip6po_nexthop, *buf); 2609 break; 2610 2611 case IPV6_2292HOPOPTS: 2612 case IPV6_HOPOPTS: 2613 { 2614 struct ip6_hbh *hbh; 2615 int hbhlen; 2616 2617 /* 2618 * XXX: We don't allow a non-privileged user to set ANY HbH 2619 * options, since per-option restriction has too much 2620 * overhead. 2621 */ 2622 if (cred != NULL) { 2623 error = priv_check_cred(cred, 2624 PRIV_NETINET_SETHDROPTS, 0); 2625 if (error) 2626 return (error); 2627 } 2628 2629 if (len == 0) { 2630 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2631 break; /* just remove the option */ 2632 } 2633 2634 /* message length validation */ 2635 if (len < sizeof(struct ip6_hbh)) 2636 return (EINVAL); 2637 hbh = (struct ip6_hbh *)buf; 2638 hbhlen = (hbh->ip6h_len + 1) << 3; 2639 if (len != hbhlen) 2640 return (EINVAL); 2641 2642 /* turn off the previous option, then set the new option. */ 2643 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2644 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2645 if (opt->ip6po_hbh == NULL) 2646 return (ENOBUFS); 2647 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2648 2649 break; 2650 } 2651 2652 case IPV6_2292DSTOPTS: 2653 case IPV6_DSTOPTS: 2654 case IPV6_RTHDRDSTOPTS: 2655 { 2656 struct ip6_dest *dest, **newdest = NULL; 2657 int destlen; 2658 2659 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2660 error = priv_check_cred(cred, 2661 PRIV_NETINET_SETHDROPTS, 0); 2662 if (error) 2663 return (error); 2664 } 2665 2666 if (len == 0) { 2667 ip6_clearpktopts(opt, optname); 2668 break; /* just remove the option */ 2669 } 2670 2671 /* message length validation */ 2672 if (len < sizeof(struct ip6_dest)) 2673 return (EINVAL); 2674 dest = (struct ip6_dest *)buf; 2675 destlen = (dest->ip6d_len + 1) << 3; 2676 if (len != destlen) 2677 return (EINVAL); 2678 2679 /* 2680 * Determine the position that the destination options header 2681 * should be inserted; before or after the routing header. 2682 */ 2683 switch (optname) { 2684 case IPV6_2292DSTOPTS: 2685 /* 2686 * The old advacned API is ambiguous on this point. 2687 * Our approach is to determine the position based 2688 * according to the existence of a routing header. 2689 * Note, however, that this depends on the order of the 2690 * extension headers in the ancillary data; the 1st 2691 * part of the destination options header must appear 2692 * before the routing header in the ancillary data, 2693 * too. 2694 * RFC3542 solved the ambiguity by introducing 2695 * separate ancillary data or option types. 2696 */ 2697 if (opt->ip6po_rthdr == NULL) 2698 newdest = &opt->ip6po_dest1; 2699 else 2700 newdest = &opt->ip6po_dest2; 2701 break; 2702 case IPV6_RTHDRDSTOPTS: 2703 newdest = &opt->ip6po_dest1; 2704 break; 2705 case IPV6_DSTOPTS: 2706 newdest = &opt->ip6po_dest2; 2707 break; 2708 } 2709 2710 /* turn off the previous option, then set the new option. */ 2711 ip6_clearpktopts(opt, optname); 2712 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2713 if (*newdest == NULL) 2714 return (ENOBUFS); 2715 bcopy(dest, *newdest, destlen); 2716 2717 break; 2718 } 2719 2720 case IPV6_2292RTHDR: 2721 case IPV6_RTHDR: 2722 { 2723 struct ip6_rthdr *rth; 2724 int rthlen; 2725 2726 if (len == 0) { 2727 ip6_clearpktopts(opt, IPV6_RTHDR); 2728 break; /* just remove the option */ 2729 } 2730 2731 /* message length validation */ 2732 if (len < sizeof(struct ip6_rthdr)) 2733 return (EINVAL); 2734 rth = (struct ip6_rthdr *)buf; 2735 rthlen = (rth->ip6r_len + 1) << 3; 2736 if (len != rthlen) 2737 return (EINVAL); 2738 2739 switch (rth->ip6r_type) { 2740 case IPV6_RTHDR_TYPE_0: 2741 if (rth->ip6r_len == 0) /* must contain one addr */ 2742 return (EINVAL); 2743 if (rth->ip6r_len % 2) /* length must be even */ 2744 return (EINVAL); 2745 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2746 return (EINVAL); 2747 break; 2748 default: 2749 return (EINVAL); /* not supported */ 2750 } 2751 2752 /* turn off the previous option */ 2753 ip6_clearpktopts(opt, IPV6_RTHDR); 2754 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2755 if (opt->ip6po_rthdr == NULL) 2756 return (ENOBUFS); 2757 bcopy(rth, opt->ip6po_rthdr, rthlen); 2758 2759 break; 2760 } 2761 2762 case IPV6_USE_MIN_MTU: 2763 if (len != sizeof(int)) 2764 return (EINVAL); 2765 minmtupolicy = *(int *)buf; 2766 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2767 minmtupolicy != IP6PO_MINMTU_DISABLE && 2768 minmtupolicy != IP6PO_MINMTU_ALL) { 2769 return (EINVAL); 2770 } 2771 opt->ip6po_minmtu = minmtupolicy; 2772 break; 2773 2774 case IPV6_DONTFRAG: 2775 if (len != sizeof(int)) 2776 return (EINVAL); 2777 2778 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2779 /* 2780 * we ignore this option for TCP sockets. 2781 * (RFC3542 leaves this case unspecified.) 2782 */ 2783 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2784 } else 2785 opt->ip6po_flags |= IP6PO_DONTFRAG; 2786 break; 2787 2788 case IPV6_PREFER_TEMPADDR: 2789 if (len != sizeof(int)) 2790 return (EINVAL); 2791 preftemp = *(int *)buf; 2792 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2793 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2794 preftemp != IP6PO_TEMPADDR_PREFER) { 2795 return (EINVAL); 2796 } 2797 opt->ip6po_prefer_tempaddr = preftemp; 2798 break; 2799 2800 default: 2801 return (ENOPROTOOPT); 2802 } /* end of switch */ 2803 2804 return (0); 2805} 2806 2807/* 2808 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2809 * packet to the input queue of a specified interface. Note that this 2810 * calls the output routine of the loopback "driver", but with an interface 2811 * pointer that might NOT be &loif -- easier than replicating that code here. 2812 */ 2813void 2814ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2815{ 2816 struct mbuf *copym; 2817 struct ip6_hdr *ip6; 2818 2819 copym = m_copy(m, 0, M_COPYALL); 2820 if (copym == NULL) 2821 return; 2822 2823 /* 2824 * Make sure to deep-copy IPv6 header portion in case the data 2825 * is in an mbuf cluster, so that we can safely override the IPv6 2826 * header portion later. 2827 */ 2828 if ((copym->m_flags & M_EXT) != 0 || 2829 copym->m_len < sizeof(struct ip6_hdr)) { 2830 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2831 if (copym == NULL) 2832 return; 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 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 2842 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 2843 CSUM_PSEUDO_HDR; 2844 copym->m_pkthdr.csum_data = 0xffff; 2845 } 2846 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2847} 2848 2849/* 2850 * Chop IPv6 header off from the payload. 2851 */ 2852static int 2853ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2854{ 2855 struct mbuf *mh; 2856 struct ip6_hdr *ip6; 2857 2858 ip6 = mtod(m, struct ip6_hdr *); 2859 if (m->m_len > sizeof(*ip6)) { 2860 mh = m_gethdr(M_NOWAIT, MT_DATA); 2861 if (mh == NULL) { 2862 m_freem(m); 2863 return ENOBUFS; 2864 } 2865 m_move_pkthdr(mh, m); 2866 MH_ALIGN(mh, sizeof(*ip6)); 2867 m->m_len -= sizeof(*ip6); 2868 m->m_data += sizeof(*ip6); 2869 mh->m_next = m; 2870 m = mh; 2871 m->m_len = sizeof(*ip6); 2872 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2873 } 2874 exthdrs->ip6e_ip6 = m; 2875 return 0; 2876} 2877 2878/* 2879 * Compute IPv6 extension header length. 2880 */ 2881int 2882ip6_optlen(struct inpcb *in6p) 2883{ 2884 int len; 2885 2886 if (!in6p->in6p_outputopts) 2887 return 0; 2888 2889 len = 0; 2890#define elen(x) \ 2891 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2892 2893 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2894 if (in6p->in6p_outputopts->ip6po_rthdr) 2895 /* dest1 is valid with rthdr only */ 2896 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2897 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2898 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2899 return len; 2900#undef elen 2901} 2902