Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_output.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_sctp.h" 70 #include "opt_route.h" 71 #include "opt_rss.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/if_var.h> 90 #include <net/if_llatbl.h> 91 #include <net/netisr.h> 92 #include <net/route.h> 93 #include <net/pfil.h> 94 #include <net/rss_config.h> 95 #include <net/vnet.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 #include <netinet/ip_var.h> 100 #include <netinet6/in6_fib.h> 101 #include <netinet6/in6_var.h> 102 #include <netinet/ip6.h> 103 #include <netinet/icmp6.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/tcp_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/in6_rss.h> 109 110 #include <netipsec/ipsec_support.h> 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 122 123 extern int in6_mcast_loop; 124 125 struct 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 }; 132 133 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options"); 134 135 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 136 struct ucred *, int); 137 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 138 struct socket *, struct sockopt *); 139 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 140 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 141 struct ucred *, int, int, int); 142 143 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 144 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 145 struct ip6_frag **); 146 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 147 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 148 static int ip6_getpmtu(struct route_in6 *, int, 149 struct ifnet *, const struct in6_addr *, u_long *, int *, u_int, 150 u_int); 151 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long, 152 u_long *, int *, u_int); 153 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *); 154 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 155 156 157 /* 158 * Make an extension header from option data. hp is the source, 159 * mp is the destination, and _ol is the optlen. 160 */ 161 #define MAKE_EXTHDR(hp, mp, _ol) \ 162 do { \ 163 if (hp) { \ 164 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 165 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 166 ((eh)->ip6e_len + 1) << 3); \ 167 if (error) \ 168 goto freehdrs; \ 169 (_ol) += (*(mp))->m_len; \ 170 } \ 171 } while (/*CONSTCOND*/ 0) 172 173 /* 174 * Form a chain of extension headers. 175 * m is the extension header mbuf 176 * mp is the previous mbuf in the chain 177 * p is the next header 178 * i is the type of option. 179 */ 180 #define MAKE_CHAIN(m, mp, p, i)\ 181 do {\ 182 if (m) {\ 183 if (!hdrsplit) \ 184 panic("%s:%d: assumption failed: "\ 185 "hdr not split: hdrsplit %d exthdrs %p",\ 186 __func__, __LINE__, hdrsplit, &exthdrs);\ 187 *mtod((m), u_char *) = *(p);\ 188 *(p) = (i);\ 189 p = mtod((m), u_char *);\ 190 (m)->m_next = (mp)->m_next;\ 191 (mp)->m_next = (m);\ 192 (mp) = (m);\ 193 }\ 194 } while (/*CONSTCOND*/ 0) 195 196 void 197 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 198 { 199 u_short csum; 200 201 csum = in_cksum_skip(m, offset + plen, offset); 202 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 203 csum = 0xffff; 204 offset += m->m_pkthdr.csum_data; /* checksum offset */ 205 206 if (offset + sizeof(csum) > m->m_len) 207 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 208 else 209 *(u_short *)mtodo(m, offset) = csum; 210 } 211 212 static int 213 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags, 214 int plen, int optlen, bool frag __unused) 215 { 216 217 KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p " 218 "csum_flags %#x frag %d\n", 219 __func__, __LINE__, plen, optlen, m, ifp, csum_flags, frag)); 220 221 if ((csum_flags & CSUM_DELAY_DATA_IPV6) || 222 #ifdef SCTP 223 (csum_flags & CSUM_SCTP_IPV6) || 224 #endif 225 false) { 226 if (csum_flags & CSUM_DELAY_DATA_IPV6) { 227 in6_delayed_cksum(m, plen - optlen, 228 sizeof(struct ip6_hdr) + optlen); 229 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 230 } 231 #ifdef SCTP 232 if (csum_flags & CSUM_SCTP_IPV6) { 233 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen); 234 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 235 } 236 #endif 237 } 238 239 return (0); 240 } 241 242 int 243 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 244 int mtu, uint32_t id) 245 { 246 struct mbuf *m, **mnext, *m_frgpart; 247 struct ip6_hdr *ip6, *mhip6; 248 struct ip6_frag *ip6f; 249 int off; 250 int error; 251 int tlen = m0->m_pkthdr.len; 252 253 KASSERT(( mtu % 8 == 0), ("Fragment length must be a multiple of 8")); 254 255 m = m0; 256 ip6 = mtod(m, struct ip6_hdr *); 257 mnext = &m->m_nextpkt; 258 259 for (off = hlen; off < tlen; off += mtu) { 260 m = m_gethdr(M_NOWAIT, MT_DATA); 261 if (!m) { 262 IP6STAT_INC(ip6s_odropped); 263 return (ENOBUFS); 264 } 265 266 /* 267 * Make sure the complete packet header gets copied 268 * from the originating mbuf to the newly created 269 * mbuf. This also ensures that existing firewall 270 * classification(s), VLAN tags and so on get copied 271 * to the resulting fragmented packet(s): 272 */ 273 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 274 m_free(m); 275 IP6STAT_INC(ip6s_odropped); 276 return (ENOBUFS); 277 } 278 279 *mnext = m; 280 mnext = &m->m_nextpkt; 281 m->m_data += max_linkhdr; 282 mhip6 = mtod(m, struct ip6_hdr *); 283 *mhip6 = *ip6; 284 m->m_len = sizeof(*mhip6); 285 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 286 if (error) { 287 IP6STAT_INC(ip6s_odropped); 288 return (error); 289 } 290 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 291 if (off + mtu >= tlen) 292 mtu = tlen - off; 293 else 294 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 295 mhip6->ip6_plen = htons((u_short)(mtu + hlen + 296 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 297 if ((m_frgpart = m_copy(m0, off, mtu)) == NULL) { 298 IP6STAT_INC(ip6s_odropped); 299 return (ENOBUFS); 300 } 301 m_cat(m, m_frgpart); 302 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f); 303 ip6f->ip6f_reserved = 0; 304 ip6f->ip6f_ident = id; 305 ip6f->ip6f_nxt = nextproto; 306 IP6STAT_INC(ip6s_ofragments); 307 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 308 } 309 310 return (0); 311 } 312 313 /* 314 * IP6 output. 315 * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len, 316 * nxt, hlim, src, dst). 317 * This function may modify ver and hlim only. 318 * The mbuf chain containing the packet will be freed. 319 * The mbuf opt, if present, will not be freed. 320 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 321 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 322 * then result of route lookup is stored in ro->ro_rt. 323 * 324 * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu 325 * is uint32_t. So we use u_long to hold largest one, which is rt_mtu. 326 * 327 * ifpp - XXX: just for statistics 328 */ 329 /* 330 * XXX TODO: no flowid is assigned for outbound flows? 331 */ 332 int 333 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 334 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 335 struct ifnet **ifpp, struct inpcb *inp) 336 { 337 struct ip6_hdr *ip6; 338 struct ifnet *ifp, *origifp; 339 struct mbuf *m = m0; 340 struct mbuf *mprev; 341 int tlen, len; 342 struct route_in6 ip6route; 343 struct rtentry *rt = NULL; 344 struct sockaddr_in6 *dst, src_sa, dst_sa; 345 struct in6_addr odst; 346 u_char *nexthdrp; 347 int error = 0; 348 struct in6_ifaddr *ia = NULL; 349 u_long mtu; 350 int alwaysfrag, dontfrag; 351 u_int32_t optlen, plen = 0, unfragpartlen; 352 struct ip6_exthdrs exthdrs; 353 struct in6_addr src0, dst0; 354 u_int32_t zone; 355 struct route_in6 *ro_pmtu = NULL; 356 bool hdrsplit; 357 int sw_csum, tso; 358 int needfiblookup; 359 uint32_t fibnum; 360 struct m_tag *fwd_tag = NULL; 361 uint32_t id; 362 363 if (inp != NULL) { 364 INP_LOCK_ASSERT(inp); 365 M_SETFIB(m, inp->inp_inc.inc_fibnum); 366 if ((flags & IP_NODEFAULTFLOWID) == 0) { 367 /* Unconditionally set flowid. */ 368 m->m_pkthdr.flowid = inp->inp_flowid; 369 M_HASHTYPE_SET(m, inp->inp_flowtype); 370 } 371 } 372 373 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 374 /* 375 * IPSec checking which handles several cases. 376 * FAST IPSEC: We re-injected the packet. 377 * XXX: need scope argument. 378 */ 379 if (IPSEC_ENABLED(ipv6)) { 380 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) { 381 if (error == EINPROGRESS) 382 error = 0; 383 goto done; 384 } 385 } 386 #endif /* IPSEC */ 387 388 /* Source address validation. */ 389 ip6 = mtod(m, struct ip6_hdr *); 390 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 391 (flags & IPV6_UNSPECSRC) == 0) { 392 error = EOPNOTSUPP; 393 IP6STAT_INC(ip6s_badscope); 394 goto bad; 395 } 396 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 397 error = EOPNOTSUPP; 398 IP6STAT_INC(ip6s_badscope); 399 goto bad; 400 } 401 402 /* 403 * If we are given packet options to add extension headers prepare them. 404 * Calculate the total length of the extension header chain. 405 * Keep the length of the unfragmentable part for fragmentation. 406 */ 407 bzero(&exthdrs, sizeof(exthdrs)); 408 optlen = 0; 409 unfragpartlen = sizeof(struct ip6_hdr); 410 if (opt) { 411 /* Hop-by-Hop options header. */ 412 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen); 413 414 /* Destination options header (1st part). */ 415 if (opt->ip6po_rthdr) { 416 #ifndef RTHDR_SUPPORT_IMPLEMENTED 417 /* 418 * If there is a routing header, discard the packet 419 * right away here. RH0/1 are obsolete and we do not 420 * currently support RH2/3/4. 421 * People trying to use RH253/254 may want to disable 422 * this check. 423 * The moment we do support any routing header (again) 424 * this block should check the routing type more 425 * selectively. 426 */ 427 error = EINVAL; 428 goto bad; 429 #endif 430 431 /* 432 * Destination options header (1st part). 433 * This only makes sense with a routing header. 434 * See Section 9.2 of RFC 3542. 435 * Disabling this part just for MIP6 convenience is 436 * a bad idea. We need to think carefully about a 437 * way to make the advanced API coexist with MIP6 438 * options, which might automatically be inserted in 439 * the kernel. 440 */ 441 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1, 442 optlen); 443 } 444 /* Routing header. */ 445 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen); 446 447 unfragpartlen += optlen; 448 449 /* 450 * NOTE: we don't add AH/ESP length here (done in 451 * ip6_ipsec_output()). 452 */ 453 454 /* Destination options header (2nd part). */ 455 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen); 456 } 457 458 /* 459 * If there is at least one extension header, 460 * separate IP6 header from the payload. 461 */ 462 hdrsplit = false; 463 if (optlen) { 464 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 465 m = NULL; 466 goto freehdrs; 467 } 468 m = exthdrs.ip6e_ip6; 469 ip6 = mtod(m, struct ip6_hdr *); 470 hdrsplit = true; 471 } 472 473 /* Adjust mbuf packet header length. */ 474 m->m_pkthdr.len += optlen; 475 plen = m->m_pkthdr.len - sizeof(*ip6); 476 477 /* If this is a jumbo payload, insert a jumbo payload option. */ 478 if (plen > IPV6_MAXPACKET) { 479 if (!hdrsplit) { 480 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 481 m = NULL; 482 goto freehdrs; 483 } 484 m = exthdrs.ip6e_ip6; 485 ip6 = mtod(m, struct ip6_hdr *); 486 hdrsplit = true; 487 } 488 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 489 goto freehdrs; 490 ip6->ip6_plen = 0; 491 } else 492 ip6->ip6_plen = htons(plen); 493 nexthdrp = &ip6->ip6_nxt; 494 495 if (optlen) { 496 /* 497 * Concatenate headers and fill in next header fields. 498 * Here we have, on "m" 499 * IPv6 payload 500 * and we insert headers accordingly. 501 * Finally, we should be getting: 502 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]. 503 * 504 * During the header composing process "m" points to IPv6 505 * header. "mprev" points to an extension header prior to esp. 506 */ 507 mprev = m; 508 509 /* 510 * We treat dest2 specially. This makes IPsec processing 511 * much easier. The goal here is to make mprev point the 512 * mbuf prior to dest2. 513 * 514 * Result: IPv6 dest2 payload. 515 * m and mprev will point to IPv6 header. 516 */ 517 if (exthdrs.ip6e_dest2) { 518 if (!hdrsplit) 519 panic("%s:%d: assumption failed: " 520 "hdr not split: hdrsplit %d exthdrs %p", 521 __func__, __LINE__, hdrsplit, &exthdrs); 522 exthdrs.ip6e_dest2->m_next = m->m_next; 523 m->m_next = exthdrs.ip6e_dest2; 524 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 525 ip6->ip6_nxt = IPPROTO_DSTOPTS; 526 } 527 528 /* 529 * Result: IPv6 hbh dest1 rthdr dest2 payload. 530 * m will point to IPv6 header. mprev will point to the 531 * extension header prior to dest2 (rthdr in the above case). 532 */ 533 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 534 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 535 IPPROTO_DSTOPTS); 536 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 537 IPPROTO_ROUTING); 538 } 539 540 IP6STAT_INC(ip6s_localout); 541 542 /* Route packet. */ 543 if (ro == NULL) { 544 ro = &ip6route; 545 bzero((caddr_t)ro, sizeof(*ro)); 546 } 547 ro_pmtu = ro; 548 if (opt && opt->ip6po_rthdr) 549 ro = &opt->ip6po_route; 550 dst = (struct sockaddr_in6 *)&ro->ro_dst; 551 #ifdef FLOWTABLE 552 if (ro->ro_rt == NULL) 553 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 554 #endif 555 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 556 again: 557 /* 558 * If specified, try to fill in the traffic class field. 559 * Do not override if a non-zero value is already set. 560 * We check the diffserv field and the ECN field separately. 561 */ 562 if (opt && opt->ip6po_tclass >= 0) { 563 int mask = 0; 564 565 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 566 mask |= 0xfc; 567 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 568 mask |= 0x03; 569 if (mask != 0) 570 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 571 } 572 573 /* Fill in or override the hop limit field, if necessary. */ 574 if (opt && opt->ip6po_hlim != -1) 575 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 576 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 577 if (im6o != NULL) 578 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 579 else 580 ip6->ip6_hlim = V_ip6_defmcasthlim; 581 } 582 /* 583 * Validate route against routing table additions; 584 * a better/more specific route might have been added. 585 * Make sure that the address family is set in route. 586 */ 587 if (inp) { 588 ro->ro_dst.sin6_family = AF_INET6; 589 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum); 590 } 591 if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) && 592 ro->ro_dst.sin6_family == AF_INET6 && 593 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) { 594 rt = ro->ro_rt; 595 ifp = ro->ro_rt->rt_ifp; 596 } else { 597 if (ro->ro_lle) 598 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 599 ro->ro_lle = NULL; 600 if (fwd_tag == NULL) { 601 bzero(&dst_sa, sizeof(dst_sa)); 602 dst_sa.sin6_family = AF_INET6; 603 dst_sa.sin6_len = sizeof(dst_sa); 604 dst_sa.sin6_addr = ip6->ip6_dst; 605 } 606 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 607 &rt, fibnum); 608 if (error != 0) { 609 if (ifp != NULL) 610 in6_ifstat_inc(ifp, ifs6_out_discard); 611 goto bad; 612 } 613 } 614 if (rt == NULL) { 615 /* 616 * If in6_selectroute() does not return a route entry 617 * dst may not have been updated. 618 */ 619 *dst = dst_sa; /* XXX */ 620 } 621 622 /* Then rt (for unicast) and ifp must be non-NULL valid values. */ 623 if ((flags & IPV6_FORWARDING) == 0) { 624 /* XXX: the FORWARDING flag can be set for mrouting. */ 625 in6_ifstat_inc(ifp, ifs6_out_request); 626 } 627 if (rt != NULL) { 628 ia = (struct in6_ifaddr *)(rt->rt_ifa); 629 counter_u64_add(rt->rt_pksent, 1); 630 } 631 632 /* Setup data structures for scope ID checks. */ 633 src0 = ip6->ip6_src; 634 bzero(&src_sa, sizeof(src_sa)); 635 src_sa.sin6_family = AF_INET6; 636 src_sa.sin6_len = sizeof(src_sa); 637 src_sa.sin6_addr = ip6->ip6_src; 638 639 dst0 = ip6->ip6_dst; 640 /* Re-initialize to be sure. */ 641 bzero(&dst_sa, sizeof(dst_sa)); 642 dst_sa.sin6_family = AF_INET6; 643 dst_sa.sin6_len = sizeof(dst_sa); 644 dst_sa.sin6_addr = ip6->ip6_dst; 645 646 /* Check for valid scope ID. */ 647 if (in6_setscope(&src0, ifp, &zone) == 0 && 648 sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id && 649 in6_setscope(&dst0, ifp, &zone) == 0 && 650 sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) { 651 /* 652 * The outgoing interface is in the zone of the source 653 * and destination addresses. 654 * 655 * Because the loopback interface cannot receive 656 * packets with a different scope ID than its own, 657 * there is a trick to pretend the outgoing packet 658 * was received by the real network interface, by 659 * setting "origifp" different from "ifp". This is 660 * only allowed when "ifp" is a loopback network 661 * interface. Refer to code in nd6_output_ifp() for 662 * more details. 663 */ 664 origifp = ifp; 665 666 /* 667 * We should use ia_ifp to support the case of sending 668 * packets to an address of our own. 669 */ 670 if (ia != NULL && ia->ia_ifp) 671 ifp = ia->ia_ifp; 672 673 } else if ((ifp->if_flags & IFF_LOOPBACK) == 0 || 674 sa6_recoverscope(&src_sa) != 0 || 675 sa6_recoverscope(&dst_sa) != 0 || 676 dst_sa.sin6_scope_id == 0 || 677 (src_sa.sin6_scope_id != 0 && 678 src_sa.sin6_scope_id != dst_sa.sin6_scope_id) || 679 (origifp = ifnet_byindex(dst_sa.sin6_scope_id)) == NULL) { 680 /* 681 * If the destination network interface is not a 682 * loopback interface, or the destination network 683 * address has no scope ID, or the source address has 684 * a scope ID set which is different from the 685 * destination address one, or there is no network 686 * interface representing this scope ID, the address 687 * pair is considered invalid. 688 */ 689 IP6STAT_INC(ip6s_badscope); 690 in6_ifstat_inc(ifp, ifs6_out_discard); 691 if (error == 0) 692 error = EHOSTUNREACH; /* XXX */ 693 goto bad; 694 } 695 /* All scope ID checks are successful. */ 696 697 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 698 if (opt && opt->ip6po_nextroute.ro_rt) { 699 /* 700 * The nexthop is explicitly specified by the 701 * application. We assume the next hop is an IPv6 702 * address. 703 */ 704 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 705 } 706 else if ((rt->rt_flags & RTF_GATEWAY)) 707 dst = (struct sockaddr_in6 *)rt->rt_gateway; 708 } 709 710 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 711 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */ 712 } else { 713 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 714 in6_ifstat_inc(ifp, ifs6_out_mcast); 715 716 /* Confirm that the outgoing interface supports multicast. */ 717 if (!(ifp->if_flags & IFF_MULTICAST)) { 718 IP6STAT_INC(ip6s_noroute); 719 in6_ifstat_inc(ifp, ifs6_out_discard); 720 error = ENETUNREACH; 721 goto bad; 722 } 723 if ((im6o == NULL && in6_mcast_loop) || 724 (im6o && im6o->im6o_multicast_loop)) { 725 /* 726 * Loop back multicast datagram if not expressly 727 * forbidden to do so, even if we have not joined 728 * the address; protocols will filter it later, 729 * thus deferring a hash lookup and lock acquisition 730 * at the expense of an m_copym(). 731 */ 732 ip6_mloopback(ifp, m); 733 } else { 734 /* 735 * If we are acting as a multicast router, perform 736 * multicast forwarding as if the packet had just 737 * arrived on the interface to which we are about 738 * to send. The multicast forwarding function 739 * recursively calls this function, using the 740 * IPV6_FORWARDING flag to prevent infinite recursion. 741 * 742 * Multicasts that are looped back by ip6_mloopback(), 743 * above, will be forwarded by the ip6_input() routine, 744 * if necessary. 745 */ 746 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 747 /* 748 * XXX: ip6_mforward expects that rcvif is NULL 749 * when it is called from the originating path. 750 * However, it may not always be the case. 751 */ 752 m->m_pkthdr.rcvif = NULL; 753 if (ip6_mforward(ip6, ifp, m) != 0) { 754 m_freem(m); 755 goto done; 756 } 757 } 758 } 759 /* 760 * Multicasts with a hoplimit of zero may be looped back, 761 * above, but must not be transmitted on a network. 762 * Also, multicasts addressed to the loopback interface 763 * are not sent -- the above call to ip6_mloopback() will 764 * loop back a copy if this host actually belongs to the 765 * destination group on the loopback interface. 766 */ 767 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 768 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 769 m_freem(m); 770 goto done; 771 } 772 } 773 774 /* 775 * Fill the outgoing inteface to tell the upper layer 776 * to increment per-interface statistics. 777 */ 778 if (ifpp) 779 *ifpp = ifp; 780 781 /* Determine path MTU. */ 782 if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, 783 &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0) 784 goto bad; 785 786 /* 787 * The caller of this function may specify to use the minimum MTU 788 * in some cases. 789 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 790 * setting. The logic is a bit complicated; by default, unicast 791 * packets will follow path MTU while multicast packets will be sent at 792 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 793 * including unicast ones will be sent at the minimum MTU. Multicast 794 * packets will always be sent at the minimum MTU unless 795 * IP6PO_MINMTU_DISABLE is explicitly specified. 796 * See RFC 3542 for more details. 797 */ 798 if (mtu > IPV6_MMTU) { 799 if ((flags & IPV6_MINMTU)) 800 mtu = IPV6_MMTU; 801 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 802 mtu = IPV6_MMTU; 803 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 804 (opt == NULL || 805 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 806 mtu = IPV6_MMTU; 807 } 808 } 809 810 /* 811 * Clear embedded scope identifiers if necessary. 812 * in6_clearscope() will touch the addresses only when necessary. 813 */ 814 in6_clearscope(&ip6->ip6_src); 815 in6_clearscope(&ip6->ip6_dst); 816 817 /* 818 * If the outgoing packet contains a hop-by-hop options header, 819 * it must be examined and processed even by the source node. 820 * (RFC 2460, section 4.) 821 */ 822 if (exthdrs.ip6e_hbh) { 823 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 824 u_int32_t dummy; /* XXX unused */ 825 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 826 827 #ifdef DIAGNOSTIC 828 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 829 panic("ip6e_hbh is not contiguous"); 830 #endif 831 /* 832 * XXX: if we have to send an ICMPv6 error to the sender, 833 * we need the M_LOOP flag since icmp6_error() expects 834 * the IPv6 and the hop-by-hop options header are 835 * contiguous unless the flag is set. 836 */ 837 m->m_flags |= M_LOOP; 838 m->m_pkthdr.rcvif = ifp; 839 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 840 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 841 &dummy, &plen) < 0) { 842 /* m was already freed at this point. */ 843 error = EINVAL;/* better error? */ 844 goto done; 845 } 846 m->m_flags &= ~M_LOOP; /* XXX */ 847 m->m_pkthdr.rcvif = NULL; 848 } 849 850 /* Jump over all PFIL processing if hooks are not active. */ 851 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 852 goto passout; 853 854 odst = ip6->ip6_dst; 855 /* Run through list of hooks for output packets. */ 856 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, 0, inp); 857 if (error != 0 || m == NULL) 858 goto done; 859 /* adjust pointer */ 860 ip6 = mtod(m, struct ip6_hdr *); 861 862 needfiblookup = 0; 863 /* See if destination IP address was changed by packet filter. */ 864 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 865 m->m_flags |= M_SKIP_FIREWALL; 866 /* If destination is now ourself drop to ip6_input(). */ 867 if (in6_localip(&ip6->ip6_dst)) { 868 m->m_flags |= M_FASTFWD_OURS; 869 if (m->m_pkthdr.rcvif == NULL) 870 m->m_pkthdr.rcvif = V_loif; 871 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 872 m->m_pkthdr.csum_flags |= 873 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 874 m->m_pkthdr.csum_data = 0xffff; 875 } 876 #ifdef SCTP 877 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 878 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 879 #endif 880 error = netisr_queue(NETISR_IPV6, m); 881 goto done; 882 } else { 883 RO_RTFREE(ro); 884 needfiblookup = 1; /* Redo the routing table lookup. */ 885 if (ro->ro_lle) 886 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 887 ro->ro_lle = NULL; 888 } 889 } 890 /* See if fib was changed by packet filter. */ 891 if (fibnum != M_GETFIB(m)) { 892 m->m_flags |= M_SKIP_FIREWALL; 893 fibnum = M_GETFIB(m); 894 RO_RTFREE(ro); 895 needfiblookup = 1; 896 if (ro->ro_lle) 897 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 898 ro->ro_lle = NULL; 899 } 900 if (needfiblookup) 901 goto again; 902 903 /* See if local, if yes, send it to netisr. */ 904 if (m->m_flags & M_FASTFWD_OURS) { 905 if (m->m_pkthdr.rcvif == NULL) 906 m->m_pkthdr.rcvif = V_loif; 907 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 908 m->m_pkthdr.csum_flags |= 909 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 910 m->m_pkthdr.csum_data = 0xffff; 911 } 912 #ifdef SCTP 913 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 914 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 915 #endif 916 error = netisr_queue(NETISR_IPV6, m); 917 goto done; 918 } 919 /* Or forward to some other address? */ 920 if ((m->m_flags & M_IP6_NEXTHOP) && 921 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 922 dst = (struct sockaddr_in6 *)&ro->ro_dst; 923 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 924 m->m_flags |= M_SKIP_FIREWALL; 925 m->m_flags &= ~M_IP6_NEXTHOP; 926 m_tag_delete(m, fwd_tag); 927 goto again; 928 } 929 930 passout: 931 /* 932 * Send the packet to the outgoing interface. 933 * If necessary, do IPv6 fragmentation before sending. 934 * 935 * The logic here is rather complex: 936 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 937 * 1-a: send as is if tlen <= path mtu 938 * 1-b: fragment if tlen > path mtu 939 * 940 * 2: if user asks us not to fragment (dontfrag == 1) 941 * 2-a: send as is if tlen <= interface mtu 942 * 2-b: error if tlen > interface mtu 943 * 944 * 3: if we always need to attach fragment header (alwaysfrag == 1) 945 * always fragment 946 * 947 * 4: if dontfrag == 1 && alwaysfrag == 1 948 * error, as we cannot handle this conflicting request. 949 */ 950 sw_csum = m->m_pkthdr.csum_flags; 951 if (!hdrsplit) { 952 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 953 sw_csum &= ~ifp->if_hwassist; 954 } else 955 tso = 0; 956 /* 957 * If we added extension headers, we will not do TSO and calculate the 958 * checksums ourselves for now. 959 * XXX-BZ Need a framework to know when the NIC can handle it, even 960 * with ext. hdrs. 961 */ 962 error = ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen, false); 963 if (error != 0) 964 goto bad; 965 /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */ 966 tlen = m->m_pkthdr.len; 967 968 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 969 dontfrag = 1; 970 else 971 dontfrag = 0; 972 if (dontfrag && alwaysfrag) { /* Case 4. */ 973 /* Conflicting request - can't transmit. */ 974 error = EMSGSIZE; 975 goto bad; 976 } 977 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* Case 2-b. */ 978 /* 979 * Even if the DONTFRAG option is specified, we cannot send the 980 * packet when the data length is larger than the MTU of the 981 * outgoing interface. 982 * Notify the error by sending IPV6_PATHMTU ancillary data if 983 * application wanted to know the MTU value. Also return an 984 * error code (this is not described in the API spec). 985 */ 986 if (inp != NULL) 987 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 988 error = EMSGSIZE; 989 goto bad; 990 } 991 992 /* Transmit packet without fragmentation. */ 993 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* Cases 1-a and 2-a. */ 994 struct in6_ifaddr *ia6; 995 996 ip6 = mtod(m, struct ip6_hdr *); 997 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 998 if (ia6) { 999 /* Record statistics for this interface address. */ 1000 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1); 1001 counter_u64_add(ia6->ia_ifa.ifa_obytes, 1002 m->m_pkthdr.len); 1003 ifa_free(&ia6->ia_ifa); 1004 } 1005 error = nd6_output_ifp(ifp, origifp, m, dst, 1006 (struct route *)ro); 1007 goto done; 1008 } 1009 1010 /* Try to fragment the packet. Cases 1-b and 3. */ 1011 if (mtu < IPV6_MMTU) { 1012 /* Path MTU cannot be less than IPV6_MMTU. */ 1013 error = EMSGSIZE; 1014 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1015 goto bad; 1016 } else if (ip6->ip6_plen == 0) { 1017 /* Jumbo payload cannot be fragmented. */ 1018 error = EMSGSIZE; 1019 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1020 goto bad; 1021 } else { 1022 u_char nextproto; 1023 1024 /* 1025 * Too large for the destination or interface; 1026 * fragment if possible. 1027 * Must be able to put at least 8 bytes per fragment. 1028 */ 1029 if (mtu > IPV6_MAXPACKET) 1030 mtu = IPV6_MAXPACKET; 1031 1032 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7; 1033 if (len < 8) { 1034 error = EMSGSIZE; 1035 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1036 goto bad; 1037 } 1038 1039 /* 1040 * If the interface will not calculate checksums on 1041 * fragmented packets, then do it here. 1042 * XXX-BZ handle the hw offloading case. Need flags. 1043 */ 1044 error = ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, 1045 plen, optlen, true); 1046 if (error != 0) 1047 goto bad; 1048 1049 /* 1050 * Change the next header field of the last header in the 1051 * unfragmentable part. 1052 */ 1053 if (exthdrs.ip6e_rthdr) { 1054 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1055 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1056 } else if (exthdrs.ip6e_dest1) { 1057 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1058 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1059 } else if (exthdrs.ip6e_hbh) { 1060 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1061 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1062 } else { 1063 ip6 = mtod(m, struct ip6_hdr *); 1064 nextproto = ip6->ip6_nxt; 1065 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1066 } 1067 1068 /* 1069 * Loop through length of segment after first fragment, 1070 * make new header and copy data of each part and link onto 1071 * chain. 1072 */ 1073 m0 = m; 1074 id = htonl(ip6_randomid()); 1075 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id); 1076 if (error != 0) 1077 goto sendorfree; 1078 1079 in6_ifstat_inc(ifp, ifs6_out_fragok); 1080 } 1081 1082 /* Remove leading garbage. */ 1083 sendorfree: 1084 m = m0->m_nextpkt; 1085 m0->m_nextpkt = 0; 1086 m_freem(m0); 1087 for (; m; m = m0) { 1088 m0 = m->m_nextpkt; 1089 m->m_nextpkt = 0; 1090 if (error == 0) { 1091 /* Record statistics for this interface address. */ 1092 if (ia) { 1093 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 1094 counter_u64_add(ia->ia_ifa.ifa_obytes, 1095 m->m_pkthdr.len); 1096 } 1097 error = nd6_output_ifp(ifp, origifp, m, dst, 1098 (struct route *)ro); 1099 } else 1100 m_freem(m); 1101 } 1102 1103 if (error == 0) 1104 IP6STAT_INC(ip6s_fragmented); 1105 1106 done: 1107 /* 1108 * Release the route if using our private route, or if 1109 * (with flowtable) we don't have our own reference. 1110 */ 1111 if (ro == &ip6route || 1112 (ro != NULL && ro->ro_flags & RT_NORTREF)) 1113 RO_RTFREE(ro); 1114 return (error); 1115 1116 freehdrs: 1117 m_freem(exthdrs.ip6e_hbh); /* m_freem() checks if mbuf is NULL. */ 1118 m_freem(exthdrs.ip6e_dest1); 1119 m_freem(exthdrs.ip6e_rthdr); 1120 m_freem(exthdrs.ip6e_dest2); 1121 /* FALLTHROUGH */ 1122 bad: 1123 if (m) 1124 m_freem(m); 1125 goto done; 1126 } 1127 1128 static int 1129 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1130 { 1131 struct mbuf *m; 1132 1133 if (hlen > MCLBYTES) 1134 return (ENOBUFS); /* XXX */ 1135 1136 if (hlen > MLEN) 1137 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1138 else 1139 m = m_get(M_NOWAIT, MT_DATA); 1140 if (m == NULL) 1141 return (ENOBUFS); 1142 m->m_len = hlen; 1143 if (hdr) 1144 bcopy(hdr, mtod(m, caddr_t), hlen); 1145 1146 *mp = m; 1147 return (0); 1148 } 1149 1150 /* 1151 * Insert jumbo payload option. 1152 */ 1153 static int 1154 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1155 { 1156 struct mbuf *mopt; 1157 u_char *optbuf; 1158 u_int32_t v; 1159 1160 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1161 1162 /* 1163 * If there is no hop-by-hop options header, allocate new one. 1164 * If there is one but it doesn't have enough space to store the 1165 * jumbo payload option, allocate a cluster to store the whole options. 1166 * Otherwise, use it to store the options. 1167 */ 1168 if (exthdrs->ip6e_hbh == NULL) { 1169 mopt = m_get(M_NOWAIT, MT_DATA); 1170 if (mopt == NULL) 1171 return (ENOBUFS); 1172 mopt->m_len = JUMBOOPTLEN; 1173 optbuf = mtod(mopt, u_char *); 1174 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1175 exthdrs->ip6e_hbh = mopt; 1176 } else { 1177 struct ip6_hbh *hbh; 1178 1179 mopt = exthdrs->ip6e_hbh; 1180 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1181 /* 1182 * XXX assumption: 1183 * - exthdrs->ip6e_hbh is not referenced from places 1184 * other than exthdrs. 1185 * - exthdrs->ip6e_hbh is not an mbuf chain. 1186 */ 1187 int oldoptlen = mopt->m_len; 1188 struct mbuf *n; 1189 1190 /* 1191 * XXX: give up if the whole (new) hbh header does 1192 * not fit even in an mbuf cluster. 1193 */ 1194 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1195 return (ENOBUFS); 1196 1197 /* 1198 * As a consequence, we must always prepare a cluster 1199 * at this point. 1200 */ 1201 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1202 if (n == NULL) 1203 return (ENOBUFS); 1204 n->m_len = oldoptlen + JUMBOOPTLEN; 1205 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1206 oldoptlen); 1207 optbuf = mtod(n, caddr_t) + oldoptlen; 1208 m_freem(mopt); 1209 mopt = exthdrs->ip6e_hbh = n; 1210 } else { 1211 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1212 mopt->m_len += JUMBOOPTLEN; 1213 } 1214 optbuf[0] = IP6OPT_PADN; 1215 optbuf[1] = 1; 1216 1217 /* 1218 * Adjust the header length according to the pad and 1219 * the jumbo payload option. 1220 */ 1221 hbh = mtod(mopt, struct ip6_hbh *); 1222 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1223 } 1224 1225 /* fill in the option. */ 1226 optbuf[2] = IP6OPT_JUMBO; 1227 optbuf[3] = 4; 1228 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1229 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1230 1231 /* finally, adjust the packet header length */ 1232 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1233 1234 return (0); 1235 #undef JUMBOOPTLEN 1236 } 1237 1238 /* 1239 * Insert fragment header and copy unfragmentable header portions. 1240 */ 1241 static int 1242 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1243 struct ip6_frag **frghdrp) 1244 { 1245 struct mbuf *n, *mlast; 1246 1247 if (hlen > sizeof(struct ip6_hdr)) { 1248 n = m_copym(m0, sizeof(struct ip6_hdr), 1249 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1250 if (n == NULL) 1251 return (ENOBUFS); 1252 m->m_next = n; 1253 } else 1254 n = m; 1255 1256 /* Search for the last mbuf of unfragmentable part. */ 1257 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1258 ; 1259 1260 if (M_WRITABLE(mlast) && 1261 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1262 /* use the trailing space of the last mbuf for the fragment hdr */ 1263 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1264 mlast->m_len); 1265 mlast->m_len += sizeof(struct ip6_frag); 1266 m->m_pkthdr.len += sizeof(struct ip6_frag); 1267 } else { 1268 /* allocate a new mbuf for the fragment header */ 1269 struct mbuf *mfrg; 1270 1271 mfrg = m_get(M_NOWAIT, MT_DATA); 1272 if (mfrg == NULL) 1273 return (ENOBUFS); 1274 mfrg->m_len = sizeof(struct ip6_frag); 1275 *frghdrp = mtod(mfrg, struct ip6_frag *); 1276 mlast->m_next = mfrg; 1277 } 1278 1279 return (0); 1280 } 1281 1282 /* 1283 * Calculates IPv6 path mtu for destination @dst. 1284 * Resulting MTU is stored in @mtup. 1285 * 1286 * Returns 0 on success. 1287 */ 1288 static int 1289 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup) 1290 { 1291 struct nhop6_extended nh6; 1292 struct in6_addr kdst; 1293 uint32_t scopeid; 1294 struct ifnet *ifp; 1295 u_long mtu; 1296 int error; 1297 1298 in6_splitscope(dst, &kdst, &scopeid); 1299 if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0) 1300 return (EHOSTUNREACH); 1301 1302 ifp = nh6.nh_ifp; 1303 mtu = nh6.nh_mtu; 1304 1305 error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0); 1306 fib6_free_nh_ext(fibnum, &nh6); 1307 1308 return (error); 1309 } 1310 1311 /* 1312 * Calculates IPv6 path MTU for @dst based on transmit @ifp, 1313 * and cached data in @ro_pmtu. 1314 * MTU from (successful) route lookup is saved (along with dst) 1315 * inside @ro_pmtu to avoid subsequent route lookups after packet 1316 * filter processing. 1317 * 1318 * Stores mtu and always-frag value into @mtup and @alwaysfragp. 1319 * Returns 0 on success. 1320 */ 1321 static int 1322 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup, 1323 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup, 1324 int *alwaysfragp, u_int fibnum, u_int proto) 1325 { 1326 struct nhop6_basic nh6; 1327 struct in6_addr kdst; 1328 uint32_t scopeid; 1329 struct sockaddr_in6 *sa6_dst; 1330 u_long mtu; 1331 1332 mtu = 0; 1333 if (do_lookup) { 1334 1335 /* 1336 * Here ro_pmtu has final destination address, while 1337 * ro might represent immediate destination. 1338 * Use ro_pmtu destination since mtu might differ. 1339 */ 1340 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1341 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst)) 1342 ro_pmtu->ro_mtu = 0; 1343 1344 if (ro_pmtu->ro_mtu == 0) { 1345 bzero(sa6_dst, sizeof(*sa6_dst)); 1346 sa6_dst->sin6_family = AF_INET6; 1347 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1348 sa6_dst->sin6_addr = *dst; 1349 1350 in6_splitscope(dst, &kdst, &scopeid); 1351 if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0, 1352 &nh6) == 0) 1353 ro_pmtu->ro_mtu = nh6.nh_mtu; 1354 } 1355 1356 mtu = ro_pmtu->ro_mtu; 1357 } 1358 1359 if (ro_pmtu->ro_rt) 1360 mtu = ro_pmtu->ro_rt->rt_mtu; 1361 1362 return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto)); 1363 } 1364 1365 /* 1366 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and 1367 * hostcache data for @dst. 1368 * Stores mtu and always-frag value into @mtup and @alwaysfragp. 1369 * 1370 * Returns 0 on success. 1371 */ 1372 static int 1373 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu, 1374 u_long *mtup, int *alwaysfragp, u_int proto) 1375 { 1376 u_long mtu = 0; 1377 int alwaysfrag = 0; 1378 int error = 0; 1379 1380 if (rt_mtu > 0) { 1381 u_int32_t ifmtu; 1382 struct in_conninfo inc; 1383 1384 bzero(&inc, sizeof(inc)); 1385 inc.inc_flags |= INC_ISIPV6; 1386 inc.inc6_faddr = *dst; 1387 1388 ifmtu = IN6_LINKMTU(ifp); 1389 1390 /* TCP is known to react to pmtu changes so skip hc */ 1391 if (proto != IPPROTO_TCP) 1392 mtu = tcp_hc_getmtu(&inc); 1393 1394 if (mtu) 1395 mtu = min(mtu, rt_mtu); 1396 else 1397 mtu = rt_mtu; 1398 if (mtu == 0) 1399 mtu = ifmtu; 1400 else if (mtu < IPV6_MMTU) { 1401 /* 1402 * RFC2460 section 5, last paragraph: 1403 * if we record ICMPv6 too big message with 1404 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1405 * or smaller, with framgent header attached. 1406 * (fragment header is needed regardless from the 1407 * packet size, for translators to identify packets) 1408 */ 1409 alwaysfrag = 1; 1410 mtu = IPV6_MMTU; 1411 } 1412 } else if (ifp) { 1413 mtu = IN6_LINKMTU(ifp); 1414 } else 1415 error = EHOSTUNREACH; /* XXX */ 1416 1417 *mtup = mtu; 1418 if (alwaysfragp) 1419 *alwaysfragp = alwaysfrag; 1420 return (error); 1421 } 1422 1423 /* 1424 * IP6 socket option processing. 1425 */ 1426 int 1427 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1428 { 1429 int optdatalen, uproto; 1430 void *optdata; 1431 struct inpcb *in6p = sotoinpcb(so); 1432 int error, optval; 1433 int level, op, optname; 1434 int optlen; 1435 struct thread *td; 1436 #ifdef RSS 1437 uint32_t rss_bucket; 1438 int retval; 1439 #endif 1440 1441 /* 1442 * Don't use more than a quarter of mbuf clusters. N.B.: 1443 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow 1444 * on LP64 architectures, so cast to u_long to avoid undefined 1445 * behavior. ILP32 architectures cannot have nmbclusters 1446 * large enough to overflow for other reasons. 1447 */ 1448 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4) 1449 1450 level = sopt->sopt_level; 1451 op = sopt->sopt_dir; 1452 optname = sopt->sopt_name; 1453 optlen = sopt->sopt_valsize; 1454 td = sopt->sopt_td; 1455 error = 0; 1456 optval = 0; 1457 uproto = (int)so->so_proto->pr_protocol; 1458 1459 if (level != IPPROTO_IPV6) { 1460 error = EINVAL; 1461 1462 if (sopt->sopt_level == SOL_SOCKET && 1463 sopt->sopt_dir == SOPT_SET) { 1464 switch (sopt->sopt_name) { 1465 case SO_REUSEADDR: 1466 INP_WLOCK(in6p); 1467 if ((so->so_options & SO_REUSEADDR) != 0) 1468 in6p->inp_flags2 |= INP_REUSEADDR; 1469 else 1470 in6p->inp_flags2 &= ~INP_REUSEADDR; 1471 INP_WUNLOCK(in6p); 1472 error = 0; 1473 break; 1474 case SO_REUSEPORT: 1475 INP_WLOCK(in6p); 1476 if ((so->so_options & SO_REUSEPORT) != 0) 1477 in6p->inp_flags2 |= INP_REUSEPORT; 1478 else 1479 in6p->inp_flags2 &= ~INP_REUSEPORT; 1480 INP_WUNLOCK(in6p); 1481 error = 0; 1482 break; 1483 case SO_SETFIB: 1484 INP_WLOCK(in6p); 1485 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1486 INP_WUNLOCK(in6p); 1487 error = 0; 1488 break; 1489 default: 1490 break; 1491 } 1492 } 1493 } else { /* level == IPPROTO_IPV6 */ 1494 switch (op) { 1495 1496 case SOPT_SET: 1497 switch (optname) { 1498 case IPV6_2292PKTOPTIONS: 1499 #ifdef IPV6_PKTOPTIONS 1500 case IPV6_PKTOPTIONS: 1501 #endif 1502 { 1503 struct mbuf *m; 1504 1505 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) { 1506 printf("ip6_ctloutput: mbuf limit hit\n"); 1507 error = ENOBUFS; 1508 break; 1509 } 1510 1511 error = soopt_getm(sopt, &m); /* XXX */ 1512 if (error != 0) 1513 break; 1514 error = soopt_mcopyin(sopt, m); /* XXX */ 1515 if (error != 0) 1516 break; 1517 INP_WLOCK(in6p); 1518 error = ip6_pcbopts(&in6p->in6p_outputopts, 1519 m, so, sopt); 1520 INP_WUNLOCK(in6p); 1521 m_freem(m); /* XXX */ 1522 break; 1523 } 1524 1525 /* 1526 * Use of some Hop-by-Hop options or some 1527 * Destination options, might require special 1528 * privilege. That is, normal applications 1529 * (without special privilege) might be forbidden 1530 * from setting certain options in outgoing packets, 1531 * and might never see certain options in received 1532 * packets. [RFC 2292 Section 6] 1533 * KAME specific note: 1534 * KAME prevents non-privileged users from sending or 1535 * receiving ANY hbh/dst options in order to avoid 1536 * overhead of parsing options in the kernel. 1537 */ 1538 case IPV6_RECVHOPOPTS: 1539 case IPV6_RECVDSTOPTS: 1540 case IPV6_RECVRTHDRDSTOPTS: 1541 if (td != NULL) { 1542 error = priv_check(td, 1543 PRIV_NETINET_SETHDROPTS); 1544 if (error) 1545 break; 1546 } 1547 /* FALLTHROUGH */ 1548 case IPV6_UNICAST_HOPS: 1549 case IPV6_HOPLIMIT: 1550 1551 case IPV6_RECVPKTINFO: 1552 case IPV6_RECVHOPLIMIT: 1553 case IPV6_RECVRTHDR: 1554 case IPV6_RECVPATHMTU: 1555 case IPV6_RECVTCLASS: 1556 case IPV6_RECVFLOWID: 1557 #ifdef RSS 1558 case IPV6_RECVRSSBUCKETID: 1559 #endif 1560 case IPV6_V6ONLY: 1561 case IPV6_AUTOFLOWLABEL: 1562 case IPV6_BINDANY: 1563 case IPV6_BINDMULTI: 1564 #ifdef RSS 1565 case IPV6_RSS_LISTEN_BUCKET: 1566 #endif 1567 if (optname == IPV6_BINDANY && td != NULL) { 1568 error = priv_check(td, 1569 PRIV_NETINET_BINDANY); 1570 if (error) 1571 break; 1572 } 1573 1574 if (optlen != sizeof(int)) { 1575 error = EINVAL; 1576 break; 1577 } 1578 error = sooptcopyin(sopt, &optval, 1579 sizeof optval, sizeof optval); 1580 if (error) 1581 break; 1582 switch (optname) { 1583 1584 case IPV6_UNICAST_HOPS: 1585 if (optval < -1 || optval >= 256) 1586 error = EINVAL; 1587 else { 1588 /* -1 = kernel default */ 1589 in6p->in6p_hops = optval; 1590 if ((in6p->inp_vflag & 1591 INP_IPV4) != 0) 1592 in6p->inp_ip_ttl = optval; 1593 } 1594 break; 1595 #define OPTSET(bit) \ 1596 do { \ 1597 INP_WLOCK(in6p); \ 1598 if (optval) \ 1599 in6p->inp_flags |= (bit); \ 1600 else \ 1601 in6p->inp_flags &= ~(bit); \ 1602 INP_WUNLOCK(in6p); \ 1603 } while (/*CONSTCOND*/ 0) 1604 #define OPTSET2292(bit) \ 1605 do { \ 1606 INP_WLOCK(in6p); \ 1607 in6p->inp_flags |= IN6P_RFC2292; \ 1608 if (optval) \ 1609 in6p->inp_flags |= (bit); \ 1610 else \ 1611 in6p->inp_flags &= ~(bit); \ 1612 INP_WUNLOCK(in6p); \ 1613 } while (/*CONSTCOND*/ 0) 1614 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1615 1616 #define OPTSET2(bit, val) do { \ 1617 INP_WLOCK(in6p); \ 1618 if (val) \ 1619 in6p->inp_flags2 |= bit; \ 1620 else \ 1621 in6p->inp_flags2 &= ~bit; \ 1622 INP_WUNLOCK(in6p); \ 1623 } while (0) 1624 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0) 1625 1626 case IPV6_RECVPKTINFO: 1627 /* cannot mix with RFC2292 */ 1628 if (OPTBIT(IN6P_RFC2292)) { 1629 error = EINVAL; 1630 break; 1631 } 1632 OPTSET(IN6P_PKTINFO); 1633 break; 1634 1635 case IPV6_HOPLIMIT: 1636 { 1637 struct ip6_pktopts **optp; 1638 1639 /* cannot mix with RFC2292 */ 1640 if (OPTBIT(IN6P_RFC2292)) { 1641 error = EINVAL; 1642 break; 1643 } 1644 optp = &in6p->in6p_outputopts; 1645 error = ip6_pcbopt(IPV6_HOPLIMIT, 1646 (u_char *)&optval, sizeof(optval), 1647 optp, (td != NULL) ? td->td_ucred : 1648 NULL, uproto); 1649 break; 1650 } 1651 1652 case IPV6_RECVHOPLIMIT: 1653 /* cannot mix with RFC2292 */ 1654 if (OPTBIT(IN6P_RFC2292)) { 1655 error = EINVAL; 1656 break; 1657 } 1658 OPTSET(IN6P_HOPLIMIT); 1659 break; 1660 1661 case IPV6_RECVHOPOPTS: 1662 /* cannot mix with RFC2292 */ 1663 if (OPTBIT(IN6P_RFC2292)) { 1664 error = EINVAL; 1665 break; 1666 } 1667 OPTSET(IN6P_HOPOPTS); 1668 break; 1669 1670 case IPV6_RECVDSTOPTS: 1671 /* cannot mix with RFC2292 */ 1672 if (OPTBIT(IN6P_RFC2292)) { 1673 error = EINVAL; 1674 break; 1675 } 1676 OPTSET(IN6P_DSTOPTS); 1677 break; 1678 1679 case IPV6_RECVRTHDRDSTOPTS: 1680 /* cannot mix with RFC2292 */ 1681 if (OPTBIT(IN6P_RFC2292)) { 1682 error = EINVAL; 1683 break; 1684 } 1685 OPTSET(IN6P_RTHDRDSTOPTS); 1686 break; 1687 1688 case IPV6_RECVRTHDR: 1689 /* cannot mix with RFC2292 */ 1690 if (OPTBIT(IN6P_RFC2292)) { 1691 error = EINVAL; 1692 break; 1693 } 1694 OPTSET(IN6P_RTHDR); 1695 break; 1696 1697 case IPV6_RECVPATHMTU: 1698 /* 1699 * We ignore this option for TCP 1700 * sockets. 1701 * (RFC3542 leaves this case 1702 * unspecified.) 1703 */ 1704 if (uproto != IPPROTO_TCP) 1705 OPTSET(IN6P_MTU); 1706 break; 1707 1708 case IPV6_RECVFLOWID: 1709 OPTSET2(INP_RECVFLOWID, optval); 1710 break; 1711 1712 #ifdef RSS 1713 case IPV6_RECVRSSBUCKETID: 1714 OPTSET2(INP_RECVRSSBUCKETID, optval); 1715 break; 1716 #endif 1717 1718 case IPV6_V6ONLY: 1719 /* 1720 * make setsockopt(IPV6_V6ONLY) 1721 * available only prior to bind(2). 1722 * see ipng mailing list, Jun 22 2001. 1723 */ 1724 if (in6p->inp_lport || 1725 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1726 error = EINVAL; 1727 break; 1728 } 1729 OPTSET(IN6P_IPV6_V6ONLY); 1730 if (optval) 1731 in6p->inp_vflag &= ~INP_IPV4; 1732 else 1733 in6p->inp_vflag |= INP_IPV4; 1734 break; 1735 case IPV6_RECVTCLASS: 1736 /* cannot mix with RFC2292 XXX */ 1737 if (OPTBIT(IN6P_RFC2292)) { 1738 error = EINVAL; 1739 break; 1740 } 1741 OPTSET(IN6P_TCLASS); 1742 break; 1743 case IPV6_AUTOFLOWLABEL: 1744 OPTSET(IN6P_AUTOFLOWLABEL); 1745 break; 1746 1747 case IPV6_BINDANY: 1748 OPTSET(INP_BINDANY); 1749 break; 1750 1751 case IPV6_BINDMULTI: 1752 OPTSET2(INP_BINDMULTI, optval); 1753 break; 1754 #ifdef RSS 1755 case IPV6_RSS_LISTEN_BUCKET: 1756 if ((optval >= 0) && 1757 (optval < rss_getnumbuckets())) { 1758 in6p->inp_rss_listen_bucket = optval; 1759 OPTSET2(INP_RSS_BUCKET_SET, 1); 1760 } else { 1761 error = EINVAL; 1762 } 1763 break; 1764 #endif 1765 } 1766 break; 1767 1768 case IPV6_TCLASS: 1769 case IPV6_DONTFRAG: 1770 case IPV6_USE_MIN_MTU: 1771 case IPV6_PREFER_TEMPADDR: 1772 if (optlen != sizeof(optval)) { 1773 error = EINVAL; 1774 break; 1775 } 1776 error = sooptcopyin(sopt, &optval, 1777 sizeof optval, sizeof optval); 1778 if (error) 1779 break; 1780 { 1781 struct ip6_pktopts **optp; 1782 optp = &in6p->in6p_outputopts; 1783 error = ip6_pcbopt(optname, 1784 (u_char *)&optval, sizeof(optval), 1785 optp, (td != NULL) ? td->td_ucred : 1786 NULL, uproto); 1787 break; 1788 } 1789 1790 case IPV6_2292PKTINFO: 1791 case IPV6_2292HOPLIMIT: 1792 case IPV6_2292HOPOPTS: 1793 case IPV6_2292DSTOPTS: 1794 case IPV6_2292RTHDR: 1795 /* RFC 2292 */ 1796 if (optlen != sizeof(int)) { 1797 error = EINVAL; 1798 break; 1799 } 1800 error = sooptcopyin(sopt, &optval, 1801 sizeof optval, sizeof optval); 1802 if (error) 1803 break; 1804 switch (optname) { 1805 case IPV6_2292PKTINFO: 1806 OPTSET2292(IN6P_PKTINFO); 1807 break; 1808 case IPV6_2292HOPLIMIT: 1809 OPTSET2292(IN6P_HOPLIMIT); 1810 break; 1811 case IPV6_2292HOPOPTS: 1812 /* 1813 * Check super-user privilege. 1814 * See comments for IPV6_RECVHOPOPTS. 1815 */ 1816 if (td != NULL) { 1817 error = priv_check(td, 1818 PRIV_NETINET_SETHDROPTS); 1819 if (error) 1820 return (error); 1821 } 1822 OPTSET2292(IN6P_HOPOPTS); 1823 break; 1824 case IPV6_2292DSTOPTS: 1825 if (td != NULL) { 1826 error = priv_check(td, 1827 PRIV_NETINET_SETHDROPTS); 1828 if (error) 1829 return (error); 1830 } 1831 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1832 break; 1833 case IPV6_2292RTHDR: 1834 OPTSET2292(IN6P_RTHDR); 1835 break; 1836 } 1837 break; 1838 case IPV6_PKTINFO: 1839 case IPV6_HOPOPTS: 1840 case IPV6_RTHDR: 1841 case IPV6_DSTOPTS: 1842 case IPV6_RTHDRDSTOPTS: 1843 case IPV6_NEXTHOP: 1844 { 1845 /* new advanced API (RFC3542) */ 1846 u_char *optbuf; 1847 u_char optbuf_storage[MCLBYTES]; 1848 int optlen; 1849 struct ip6_pktopts **optp; 1850 1851 /* cannot mix with RFC2292 */ 1852 if (OPTBIT(IN6P_RFC2292)) { 1853 error = EINVAL; 1854 break; 1855 } 1856 1857 /* 1858 * We only ensure valsize is not too large 1859 * here. Further validation will be done 1860 * later. 1861 */ 1862 error = sooptcopyin(sopt, optbuf_storage, 1863 sizeof(optbuf_storage), 0); 1864 if (error) 1865 break; 1866 optlen = sopt->sopt_valsize; 1867 optbuf = optbuf_storage; 1868 optp = &in6p->in6p_outputopts; 1869 error = ip6_pcbopt(optname, optbuf, optlen, 1870 optp, (td != NULL) ? td->td_ucred : NULL, 1871 uproto); 1872 break; 1873 } 1874 #undef OPTSET 1875 1876 case IPV6_MULTICAST_IF: 1877 case IPV6_MULTICAST_HOPS: 1878 case IPV6_MULTICAST_LOOP: 1879 case IPV6_JOIN_GROUP: 1880 case IPV6_LEAVE_GROUP: 1881 case IPV6_MSFILTER: 1882 case MCAST_BLOCK_SOURCE: 1883 case MCAST_UNBLOCK_SOURCE: 1884 case MCAST_JOIN_GROUP: 1885 case MCAST_LEAVE_GROUP: 1886 case MCAST_JOIN_SOURCE_GROUP: 1887 case MCAST_LEAVE_SOURCE_GROUP: 1888 error = ip6_setmoptions(in6p, sopt); 1889 break; 1890 1891 case IPV6_PORTRANGE: 1892 error = sooptcopyin(sopt, &optval, 1893 sizeof optval, sizeof optval); 1894 if (error) 1895 break; 1896 1897 INP_WLOCK(in6p); 1898 switch (optval) { 1899 case IPV6_PORTRANGE_DEFAULT: 1900 in6p->inp_flags &= ~(INP_LOWPORT); 1901 in6p->inp_flags &= ~(INP_HIGHPORT); 1902 break; 1903 1904 case IPV6_PORTRANGE_HIGH: 1905 in6p->inp_flags &= ~(INP_LOWPORT); 1906 in6p->inp_flags |= INP_HIGHPORT; 1907 break; 1908 1909 case IPV6_PORTRANGE_LOW: 1910 in6p->inp_flags &= ~(INP_HIGHPORT); 1911 in6p->inp_flags |= INP_LOWPORT; 1912 break; 1913 1914 default: 1915 error = EINVAL; 1916 break; 1917 } 1918 INP_WUNLOCK(in6p); 1919 break; 1920 1921 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1922 case IPV6_IPSEC_POLICY: 1923 if (IPSEC_ENABLED(ipv6)) { 1924 error = IPSEC_PCBCTL(ipv6, in6p, sopt); 1925 break; 1926 } 1927 /* FALLTHROUGH */ 1928 #endif /* IPSEC */ 1929 1930 default: 1931 error = ENOPROTOOPT; 1932 break; 1933 } 1934 break; 1935 1936 case SOPT_GET: 1937 switch (optname) { 1938 1939 case IPV6_2292PKTOPTIONS: 1940 #ifdef IPV6_PKTOPTIONS 1941 case IPV6_PKTOPTIONS: 1942 #endif 1943 /* 1944 * RFC3542 (effectively) deprecated the 1945 * semantics of the 2292-style pktoptions. 1946 * Since it was not reliable in nature (i.e., 1947 * applications had to expect the lack of some 1948 * information after all), it would make sense 1949 * to simplify this part by always returning 1950 * empty data. 1951 */ 1952 sopt->sopt_valsize = 0; 1953 break; 1954 1955 case IPV6_RECVHOPOPTS: 1956 case IPV6_RECVDSTOPTS: 1957 case IPV6_RECVRTHDRDSTOPTS: 1958 case IPV6_UNICAST_HOPS: 1959 case IPV6_RECVPKTINFO: 1960 case IPV6_RECVHOPLIMIT: 1961 case IPV6_RECVRTHDR: 1962 case IPV6_RECVPATHMTU: 1963 1964 case IPV6_V6ONLY: 1965 case IPV6_PORTRANGE: 1966 case IPV6_RECVTCLASS: 1967 case IPV6_AUTOFLOWLABEL: 1968 case IPV6_BINDANY: 1969 case IPV6_FLOWID: 1970 case IPV6_FLOWTYPE: 1971 case IPV6_RECVFLOWID: 1972 #ifdef RSS 1973 case IPV6_RSSBUCKETID: 1974 case IPV6_RECVRSSBUCKETID: 1975 #endif 1976 case IPV6_BINDMULTI: 1977 switch (optname) { 1978 1979 case IPV6_RECVHOPOPTS: 1980 optval = OPTBIT(IN6P_HOPOPTS); 1981 break; 1982 1983 case IPV6_RECVDSTOPTS: 1984 optval = OPTBIT(IN6P_DSTOPTS); 1985 break; 1986 1987 case IPV6_RECVRTHDRDSTOPTS: 1988 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1989 break; 1990 1991 case IPV6_UNICAST_HOPS: 1992 optval = in6p->in6p_hops; 1993 break; 1994 1995 case IPV6_RECVPKTINFO: 1996 optval = OPTBIT(IN6P_PKTINFO); 1997 break; 1998 1999 case IPV6_RECVHOPLIMIT: 2000 optval = OPTBIT(IN6P_HOPLIMIT); 2001 break; 2002 2003 case IPV6_RECVRTHDR: 2004 optval = OPTBIT(IN6P_RTHDR); 2005 break; 2006 2007 case IPV6_RECVPATHMTU: 2008 optval = OPTBIT(IN6P_MTU); 2009 break; 2010 2011 case IPV6_V6ONLY: 2012 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2013 break; 2014 2015 case IPV6_PORTRANGE: 2016 { 2017 int flags; 2018 flags = in6p->inp_flags; 2019 if (flags & INP_HIGHPORT) 2020 optval = IPV6_PORTRANGE_HIGH; 2021 else if (flags & INP_LOWPORT) 2022 optval = IPV6_PORTRANGE_LOW; 2023 else 2024 optval = 0; 2025 break; 2026 } 2027 case IPV6_RECVTCLASS: 2028 optval = OPTBIT(IN6P_TCLASS); 2029 break; 2030 2031 case IPV6_AUTOFLOWLABEL: 2032 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2033 break; 2034 2035 case IPV6_BINDANY: 2036 optval = OPTBIT(INP_BINDANY); 2037 break; 2038 2039 case IPV6_FLOWID: 2040 optval = in6p->inp_flowid; 2041 break; 2042 2043 case IPV6_FLOWTYPE: 2044 optval = in6p->inp_flowtype; 2045 break; 2046 2047 case IPV6_RECVFLOWID: 2048 optval = OPTBIT2(INP_RECVFLOWID); 2049 break; 2050 #ifdef RSS 2051 case IPV6_RSSBUCKETID: 2052 retval = 2053 rss_hash2bucket(in6p->inp_flowid, 2054 in6p->inp_flowtype, 2055 &rss_bucket); 2056 if (retval == 0) 2057 optval = rss_bucket; 2058 else 2059 error = EINVAL; 2060 break; 2061 2062 case IPV6_RECVRSSBUCKETID: 2063 optval = OPTBIT2(INP_RECVRSSBUCKETID); 2064 break; 2065 #endif 2066 2067 case IPV6_BINDMULTI: 2068 optval = OPTBIT2(INP_BINDMULTI); 2069 break; 2070 2071 } 2072 if (error) 2073 break; 2074 error = sooptcopyout(sopt, &optval, 2075 sizeof optval); 2076 break; 2077 2078 case IPV6_PATHMTU: 2079 { 2080 u_long pmtu = 0; 2081 struct ip6_mtuinfo mtuinfo; 2082 2083 if (!(so->so_state & SS_ISCONNECTED)) 2084 return (ENOTCONN); 2085 /* 2086 * XXX: we dot not consider the case of source 2087 * routing, or optional information to specify 2088 * the outgoing interface. 2089 */ 2090 error = ip6_getpmtu_ctl(so->so_fibnum, 2091 &in6p->in6p_faddr, &pmtu); 2092 if (error) 2093 break; 2094 if (pmtu > IPV6_MAXPACKET) 2095 pmtu = IPV6_MAXPACKET; 2096 2097 bzero(&mtuinfo, sizeof(mtuinfo)); 2098 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2099 optdata = (void *)&mtuinfo; 2100 optdatalen = sizeof(mtuinfo); 2101 error = sooptcopyout(sopt, optdata, 2102 optdatalen); 2103 break; 2104 } 2105 2106 case IPV6_2292PKTINFO: 2107 case IPV6_2292HOPLIMIT: 2108 case IPV6_2292HOPOPTS: 2109 case IPV6_2292RTHDR: 2110 case IPV6_2292DSTOPTS: 2111 switch (optname) { 2112 case IPV6_2292PKTINFO: 2113 optval = OPTBIT(IN6P_PKTINFO); 2114 break; 2115 case IPV6_2292HOPLIMIT: 2116 optval = OPTBIT(IN6P_HOPLIMIT); 2117 break; 2118 case IPV6_2292HOPOPTS: 2119 optval = OPTBIT(IN6P_HOPOPTS); 2120 break; 2121 case IPV6_2292RTHDR: 2122 optval = OPTBIT(IN6P_RTHDR); 2123 break; 2124 case IPV6_2292DSTOPTS: 2125 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2126 break; 2127 } 2128 error = sooptcopyout(sopt, &optval, 2129 sizeof optval); 2130 break; 2131 case IPV6_PKTINFO: 2132 case IPV6_HOPOPTS: 2133 case IPV6_RTHDR: 2134 case IPV6_DSTOPTS: 2135 case IPV6_RTHDRDSTOPTS: 2136 case IPV6_NEXTHOP: 2137 case IPV6_TCLASS: 2138 case IPV6_DONTFRAG: 2139 case IPV6_USE_MIN_MTU: 2140 case IPV6_PREFER_TEMPADDR: 2141 error = ip6_getpcbopt(in6p->in6p_outputopts, 2142 optname, sopt); 2143 break; 2144 2145 case IPV6_MULTICAST_IF: 2146 case IPV6_MULTICAST_HOPS: 2147 case IPV6_MULTICAST_LOOP: 2148 case IPV6_MSFILTER: 2149 error = ip6_getmoptions(in6p, sopt); 2150 break; 2151 2152 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 2153 case IPV6_IPSEC_POLICY: 2154 if (IPSEC_ENABLED(ipv6)) { 2155 error = IPSEC_PCBCTL(ipv6, in6p, sopt); 2156 break; 2157 } 2158 /* FALLTHROUGH */ 2159 #endif /* IPSEC */ 2160 default: 2161 error = ENOPROTOOPT; 2162 break; 2163 } 2164 break; 2165 } 2166 } 2167 return (error); 2168 } 2169 2170 int 2171 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2172 { 2173 int error = 0, optval, optlen; 2174 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2175 struct inpcb *in6p = sotoinpcb(so); 2176 int level, op, optname; 2177 2178 level = sopt->sopt_level; 2179 op = sopt->sopt_dir; 2180 optname = sopt->sopt_name; 2181 optlen = sopt->sopt_valsize; 2182 2183 if (level != IPPROTO_IPV6) { 2184 return (EINVAL); 2185 } 2186 2187 switch (optname) { 2188 case IPV6_CHECKSUM: 2189 /* 2190 * For ICMPv6 sockets, no modification allowed for checksum 2191 * offset, permit "no change" values to help existing apps. 2192 * 2193 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2194 * for an ICMPv6 socket will fail." 2195 * The current behavior does not meet RFC3542. 2196 */ 2197 switch (op) { 2198 case SOPT_SET: 2199 if (optlen != sizeof(int)) { 2200 error = EINVAL; 2201 break; 2202 } 2203 error = sooptcopyin(sopt, &optval, sizeof(optval), 2204 sizeof(optval)); 2205 if (error) 2206 break; 2207 if (optval < -1 || (optval % 2) != 0) { 2208 /* 2209 * The API assumes non-negative even offset 2210 * values or -1 as a special value. 2211 */ 2212 error = EINVAL; 2213 } else if (so->so_proto->pr_protocol == 2214 IPPROTO_ICMPV6) { 2215 if (optval != icmp6off) 2216 error = EINVAL; 2217 } else 2218 in6p->in6p_cksum = optval; 2219 break; 2220 2221 case SOPT_GET: 2222 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2223 optval = icmp6off; 2224 else 2225 optval = in6p->in6p_cksum; 2226 2227 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2228 break; 2229 2230 default: 2231 error = EINVAL; 2232 break; 2233 } 2234 break; 2235 2236 default: 2237 error = ENOPROTOOPT; 2238 break; 2239 } 2240 2241 return (error); 2242 } 2243 2244 /* 2245 * Set up IP6 options in pcb for insertion in output packets or 2246 * specifying behavior of outgoing packets. 2247 */ 2248 static int 2249 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2250 struct socket *so, struct sockopt *sopt) 2251 { 2252 struct ip6_pktopts *opt = *pktopt; 2253 int error = 0; 2254 struct thread *td = sopt->sopt_td; 2255 2256 /* turn off any old options. */ 2257 if (opt) { 2258 #ifdef DIAGNOSTIC 2259 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2260 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2261 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2262 printf("ip6_pcbopts: all specified options are cleared.\n"); 2263 #endif 2264 ip6_clearpktopts(opt, -1); 2265 } else { 2266 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2267 if (opt == NULL) 2268 return (ENOMEM); 2269 } 2270 *pktopt = NULL; 2271 2272 if (!m || m->m_len == 0) { 2273 /* 2274 * Only turning off any previous options, regardless of 2275 * whether the opt is just created or given. 2276 */ 2277 free(opt, M_IP6OPT); 2278 return (0); 2279 } 2280 2281 /* set options specified by user. */ 2282 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2283 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2284 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2285 free(opt, M_IP6OPT); 2286 return (error); 2287 } 2288 *pktopt = opt; 2289 return (0); 2290 } 2291 2292 /* 2293 * initialize ip6_pktopts. beware that there are non-zero default values in 2294 * the struct. 2295 */ 2296 void 2297 ip6_initpktopts(struct ip6_pktopts *opt) 2298 { 2299 2300 bzero(opt, sizeof(*opt)); 2301 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2302 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2303 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2304 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2305 } 2306 2307 static int 2308 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2309 struct ucred *cred, int uproto) 2310 { 2311 struct ip6_pktopts *opt; 2312 2313 if (*pktopt == NULL) { 2314 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2315 M_WAITOK); 2316 ip6_initpktopts(*pktopt); 2317 } 2318 opt = *pktopt; 2319 2320 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2321 } 2322 2323 static int 2324 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2325 { 2326 void *optdata = NULL; 2327 int optdatalen = 0; 2328 struct ip6_ext *ip6e; 2329 int error = 0; 2330 struct in6_pktinfo null_pktinfo; 2331 int deftclass = 0, on; 2332 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2333 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2334 2335 switch (optname) { 2336 case IPV6_PKTINFO: 2337 optdata = (void *)&null_pktinfo; 2338 if (pktopt && pktopt->ip6po_pktinfo) { 2339 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo, 2340 sizeof(null_pktinfo)); 2341 in6_clearscope(&null_pktinfo.ipi6_addr); 2342 } else { 2343 /* XXX: we don't have to do this every time... */ 2344 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2345 } 2346 optdatalen = sizeof(struct in6_pktinfo); 2347 break; 2348 case IPV6_TCLASS: 2349 if (pktopt && pktopt->ip6po_tclass >= 0) 2350 optdata = (void *)&pktopt->ip6po_tclass; 2351 else 2352 optdata = (void *)&deftclass; 2353 optdatalen = sizeof(int); 2354 break; 2355 case IPV6_HOPOPTS: 2356 if (pktopt && pktopt->ip6po_hbh) { 2357 optdata = (void *)pktopt->ip6po_hbh; 2358 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2359 optdatalen = (ip6e->ip6e_len + 1) << 3; 2360 } 2361 break; 2362 case IPV6_RTHDR: 2363 if (pktopt && pktopt->ip6po_rthdr) { 2364 optdata = (void *)pktopt->ip6po_rthdr; 2365 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2366 optdatalen = (ip6e->ip6e_len + 1) << 3; 2367 } 2368 break; 2369 case IPV6_RTHDRDSTOPTS: 2370 if (pktopt && pktopt->ip6po_dest1) { 2371 optdata = (void *)pktopt->ip6po_dest1; 2372 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2373 optdatalen = (ip6e->ip6e_len + 1) << 3; 2374 } 2375 break; 2376 case IPV6_DSTOPTS: 2377 if (pktopt && pktopt->ip6po_dest2) { 2378 optdata = (void *)pktopt->ip6po_dest2; 2379 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2380 optdatalen = (ip6e->ip6e_len + 1) << 3; 2381 } 2382 break; 2383 case IPV6_NEXTHOP: 2384 if (pktopt && pktopt->ip6po_nexthop) { 2385 optdata = (void *)pktopt->ip6po_nexthop; 2386 optdatalen = pktopt->ip6po_nexthop->sa_len; 2387 } 2388 break; 2389 case IPV6_USE_MIN_MTU: 2390 if (pktopt) 2391 optdata = (void *)&pktopt->ip6po_minmtu; 2392 else 2393 optdata = (void *)&defminmtu; 2394 optdatalen = sizeof(int); 2395 break; 2396 case IPV6_DONTFRAG: 2397 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2398 on = 1; 2399 else 2400 on = 0; 2401 optdata = (void *)&on; 2402 optdatalen = sizeof(on); 2403 break; 2404 case IPV6_PREFER_TEMPADDR: 2405 if (pktopt) 2406 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2407 else 2408 optdata = (void *)&defpreftemp; 2409 optdatalen = sizeof(int); 2410 break; 2411 default: /* should not happen */ 2412 #ifdef DIAGNOSTIC 2413 panic("ip6_getpcbopt: unexpected option\n"); 2414 #endif 2415 return (ENOPROTOOPT); 2416 } 2417 2418 error = sooptcopyout(sopt, optdata, optdatalen); 2419 2420 return (error); 2421 } 2422 2423 void 2424 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2425 { 2426 if (pktopt == NULL) 2427 return; 2428 2429 if (optname == -1 || optname == IPV6_PKTINFO) { 2430 if (pktopt->ip6po_pktinfo) 2431 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2432 pktopt->ip6po_pktinfo = NULL; 2433 } 2434 if (optname == -1 || optname == IPV6_HOPLIMIT) 2435 pktopt->ip6po_hlim = -1; 2436 if (optname == -1 || optname == IPV6_TCLASS) 2437 pktopt->ip6po_tclass = -1; 2438 if (optname == -1 || optname == IPV6_NEXTHOP) { 2439 if (pktopt->ip6po_nextroute.ro_rt) { 2440 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2441 pktopt->ip6po_nextroute.ro_rt = NULL; 2442 } 2443 if (pktopt->ip6po_nexthop) 2444 free(pktopt->ip6po_nexthop, M_IP6OPT); 2445 pktopt->ip6po_nexthop = NULL; 2446 } 2447 if (optname == -1 || optname == IPV6_HOPOPTS) { 2448 if (pktopt->ip6po_hbh) 2449 free(pktopt->ip6po_hbh, M_IP6OPT); 2450 pktopt->ip6po_hbh = NULL; 2451 } 2452 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2453 if (pktopt->ip6po_dest1) 2454 free(pktopt->ip6po_dest1, M_IP6OPT); 2455 pktopt->ip6po_dest1 = NULL; 2456 } 2457 if (optname == -1 || optname == IPV6_RTHDR) { 2458 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2459 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2460 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2461 if (pktopt->ip6po_route.ro_rt) { 2462 RTFREE(pktopt->ip6po_route.ro_rt); 2463 pktopt->ip6po_route.ro_rt = NULL; 2464 } 2465 } 2466 if (optname == -1 || optname == IPV6_DSTOPTS) { 2467 if (pktopt->ip6po_dest2) 2468 free(pktopt->ip6po_dest2, M_IP6OPT); 2469 pktopt->ip6po_dest2 = NULL; 2470 } 2471 } 2472 2473 #define PKTOPT_EXTHDRCPY(type) \ 2474 do {\ 2475 if (src->type) {\ 2476 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2477 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2478 if (dst->type == NULL)\ 2479 goto bad;\ 2480 bcopy(src->type, dst->type, hlen);\ 2481 }\ 2482 } while (/*CONSTCOND*/ 0) 2483 2484 static int 2485 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2486 { 2487 if (dst == NULL || src == NULL) { 2488 printf("ip6_clearpktopts: invalid argument\n"); 2489 return (EINVAL); 2490 } 2491 2492 dst->ip6po_hlim = src->ip6po_hlim; 2493 dst->ip6po_tclass = src->ip6po_tclass; 2494 dst->ip6po_flags = src->ip6po_flags; 2495 dst->ip6po_minmtu = src->ip6po_minmtu; 2496 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2497 if (src->ip6po_pktinfo) { 2498 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2499 M_IP6OPT, canwait); 2500 if (dst->ip6po_pktinfo == NULL) 2501 goto bad; 2502 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2503 } 2504 if (src->ip6po_nexthop) { 2505 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2506 M_IP6OPT, canwait); 2507 if (dst->ip6po_nexthop == NULL) 2508 goto bad; 2509 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2510 src->ip6po_nexthop->sa_len); 2511 } 2512 PKTOPT_EXTHDRCPY(ip6po_hbh); 2513 PKTOPT_EXTHDRCPY(ip6po_dest1); 2514 PKTOPT_EXTHDRCPY(ip6po_dest2); 2515 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2516 return (0); 2517 2518 bad: 2519 ip6_clearpktopts(dst, -1); 2520 return (ENOBUFS); 2521 } 2522 #undef PKTOPT_EXTHDRCPY 2523 2524 struct ip6_pktopts * 2525 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2526 { 2527 int error; 2528 struct ip6_pktopts *dst; 2529 2530 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2531 if (dst == NULL) 2532 return (NULL); 2533 ip6_initpktopts(dst); 2534 2535 if ((error = copypktopts(dst, src, canwait)) != 0) { 2536 free(dst, M_IP6OPT); 2537 return (NULL); 2538 } 2539 2540 return (dst); 2541 } 2542 2543 void 2544 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2545 { 2546 if (pktopt == NULL) 2547 return; 2548 2549 ip6_clearpktopts(pktopt, -1); 2550 2551 free(pktopt, M_IP6OPT); 2552 } 2553 2554 /* 2555 * Set IPv6 outgoing packet options based on advanced API. 2556 */ 2557 int 2558 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2559 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2560 { 2561 struct cmsghdr *cm = NULL; 2562 2563 if (control == NULL || opt == NULL) 2564 return (EINVAL); 2565 2566 ip6_initpktopts(opt); 2567 if (stickyopt) { 2568 int error; 2569 2570 /* 2571 * If stickyopt is provided, make a local copy of the options 2572 * for this particular packet, then override them by ancillary 2573 * objects. 2574 * XXX: copypktopts() does not copy the cached route to a next 2575 * hop (if any). This is not very good in terms of efficiency, 2576 * but we can allow this since this option should be rarely 2577 * used. 2578 */ 2579 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2580 return (error); 2581 } 2582 2583 /* 2584 * XXX: Currently, we assume all the optional information is stored 2585 * in a single mbuf. 2586 */ 2587 if (control->m_next) 2588 return (EINVAL); 2589 2590 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2591 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2592 int error; 2593 2594 if (control->m_len < CMSG_LEN(0)) 2595 return (EINVAL); 2596 2597 cm = mtod(control, struct cmsghdr *); 2598 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2599 return (EINVAL); 2600 if (cm->cmsg_level != IPPROTO_IPV6) 2601 continue; 2602 2603 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2604 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2605 if (error) 2606 return (error); 2607 } 2608 2609 return (0); 2610 } 2611 2612 /* 2613 * Set a particular packet option, as a sticky option or an ancillary data 2614 * item. "len" can be 0 only when it's a sticky option. 2615 * We have 4 cases of combination of "sticky" and "cmsg": 2616 * "sticky=0, cmsg=0": impossible 2617 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2618 * "sticky=1, cmsg=0": RFC3542 socket option 2619 * "sticky=1, cmsg=1": RFC2292 socket option 2620 */ 2621 static int 2622 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2623 struct ucred *cred, int sticky, int cmsg, int uproto) 2624 { 2625 int minmtupolicy, preftemp; 2626 int error; 2627 2628 if (!sticky && !cmsg) { 2629 #ifdef DIAGNOSTIC 2630 printf("ip6_setpktopt: impossible case\n"); 2631 #endif 2632 return (EINVAL); 2633 } 2634 2635 /* 2636 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2637 * not be specified in the context of RFC3542. Conversely, 2638 * RFC3542 types should not be specified in the context of RFC2292. 2639 */ 2640 if (!cmsg) { 2641 switch (optname) { 2642 case IPV6_2292PKTINFO: 2643 case IPV6_2292HOPLIMIT: 2644 case IPV6_2292NEXTHOP: 2645 case IPV6_2292HOPOPTS: 2646 case IPV6_2292DSTOPTS: 2647 case IPV6_2292RTHDR: 2648 case IPV6_2292PKTOPTIONS: 2649 return (ENOPROTOOPT); 2650 } 2651 } 2652 if (sticky && cmsg) { 2653 switch (optname) { 2654 case IPV6_PKTINFO: 2655 case IPV6_HOPLIMIT: 2656 case IPV6_NEXTHOP: 2657 case IPV6_HOPOPTS: 2658 case IPV6_DSTOPTS: 2659 case IPV6_RTHDRDSTOPTS: 2660 case IPV6_RTHDR: 2661 case IPV6_USE_MIN_MTU: 2662 case IPV6_DONTFRAG: 2663 case IPV6_TCLASS: 2664 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2665 return (ENOPROTOOPT); 2666 } 2667 } 2668 2669 switch (optname) { 2670 case IPV6_2292PKTINFO: 2671 case IPV6_PKTINFO: 2672 { 2673 struct ifnet *ifp = NULL; 2674 struct in6_pktinfo *pktinfo; 2675 2676 if (len != sizeof(struct in6_pktinfo)) 2677 return (EINVAL); 2678 2679 pktinfo = (struct in6_pktinfo *)buf; 2680 2681 /* 2682 * An application can clear any sticky IPV6_PKTINFO option by 2683 * doing a "regular" setsockopt with ipi6_addr being 2684 * in6addr_any and ipi6_ifindex being zero. 2685 * [RFC 3542, Section 6] 2686 */ 2687 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2688 pktinfo->ipi6_ifindex == 0 && 2689 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2690 ip6_clearpktopts(opt, optname); 2691 break; 2692 } 2693 2694 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2695 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2696 return (EINVAL); 2697 } 2698 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) 2699 return (EINVAL); 2700 /* validate the interface index if specified. */ 2701 if (pktinfo->ipi6_ifindex > V_if_index) 2702 return (ENXIO); 2703 if (pktinfo->ipi6_ifindex) { 2704 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2705 if (ifp == NULL) 2706 return (ENXIO); 2707 } 2708 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL || 2709 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0)) 2710 return (ENETDOWN); 2711 2712 if (ifp != NULL && 2713 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2714 struct in6_ifaddr *ia; 2715 2716 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL); 2717 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr); 2718 if (ia == NULL) 2719 return (EADDRNOTAVAIL); 2720 ifa_free(&ia->ia_ifa); 2721 } 2722 /* 2723 * We store the address anyway, and let in6_selectsrc() 2724 * validate the specified address. This is because ipi6_addr 2725 * may not have enough information about its scope zone, and 2726 * we may need additional information (such as outgoing 2727 * interface or the scope zone of a destination address) to 2728 * disambiguate the scope. 2729 * XXX: the delay of the validation may confuse the 2730 * application when it is used as a sticky option. 2731 */ 2732 if (opt->ip6po_pktinfo == NULL) { 2733 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2734 M_IP6OPT, M_NOWAIT); 2735 if (opt->ip6po_pktinfo == NULL) 2736 return (ENOBUFS); 2737 } 2738 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2739 break; 2740 } 2741 2742 case IPV6_2292HOPLIMIT: 2743 case IPV6_HOPLIMIT: 2744 { 2745 int *hlimp; 2746 2747 /* 2748 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2749 * to simplify the ordering among hoplimit options. 2750 */ 2751 if (optname == IPV6_HOPLIMIT && sticky) 2752 return (ENOPROTOOPT); 2753 2754 if (len != sizeof(int)) 2755 return (EINVAL); 2756 hlimp = (int *)buf; 2757 if (*hlimp < -1 || *hlimp > 255) 2758 return (EINVAL); 2759 2760 opt->ip6po_hlim = *hlimp; 2761 break; 2762 } 2763 2764 case IPV6_TCLASS: 2765 { 2766 int tclass; 2767 2768 if (len != sizeof(int)) 2769 return (EINVAL); 2770 tclass = *(int *)buf; 2771 if (tclass < -1 || tclass > 255) 2772 return (EINVAL); 2773 2774 opt->ip6po_tclass = tclass; 2775 break; 2776 } 2777 2778 case IPV6_2292NEXTHOP: 2779 case IPV6_NEXTHOP: 2780 if (cred != NULL) { 2781 error = priv_check_cred(cred, 2782 PRIV_NETINET_SETHDROPTS, 0); 2783 if (error) 2784 return (error); 2785 } 2786 2787 if (len == 0) { /* just remove the option */ 2788 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2789 break; 2790 } 2791 2792 /* check if cmsg_len is large enough for sa_len */ 2793 if (len < sizeof(struct sockaddr) || len < *buf) 2794 return (EINVAL); 2795 2796 switch (((struct sockaddr *)buf)->sa_family) { 2797 case AF_INET6: 2798 { 2799 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2800 int error; 2801 2802 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2803 return (EINVAL); 2804 2805 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2806 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2807 return (EINVAL); 2808 } 2809 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2810 != 0) { 2811 return (error); 2812 } 2813 break; 2814 } 2815 case AF_LINK: /* should eventually be supported */ 2816 default: 2817 return (EAFNOSUPPORT); 2818 } 2819 2820 /* turn off the previous option, then set the new option. */ 2821 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2822 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2823 if (opt->ip6po_nexthop == NULL) 2824 return (ENOBUFS); 2825 bcopy(buf, opt->ip6po_nexthop, *buf); 2826 break; 2827 2828 case IPV6_2292HOPOPTS: 2829 case IPV6_HOPOPTS: 2830 { 2831 struct ip6_hbh *hbh; 2832 int hbhlen; 2833 2834 /* 2835 * XXX: We don't allow a non-privileged user to set ANY HbH 2836 * options, since per-option restriction has too much 2837 * overhead. 2838 */ 2839 if (cred != NULL) { 2840 error = priv_check_cred(cred, 2841 PRIV_NETINET_SETHDROPTS, 0); 2842 if (error) 2843 return (error); 2844 } 2845 2846 if (len == 0) { 2847 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2848 break; /* just remove the option */ 2849 } 2850 2851 /* message length validation */ 2852 if (len < sizeof(struct ip6_hbh)) 2853 return (EINVAL); 2854 hbh = (struct ip6_hbh *)buf; 2855 hbhlen = (hbh->ip6h_len + 1) << 3; 2856 if (len != hbhlen) 2857 return (EINVAL); 2858 2859 /* turn off the previous option, then set the new option. */ 2860 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2861 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2862 if (opt->ip6po_hbh == NULL) 2863 return (ENOBUFS); 2864 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2865 2866 break; 2867 } 2868 2869 case IPV6_2292DSTOPTS: 2870 case IPV6_DSTOPTS: 2871 case IPV6_RTHDRDSTOPTS: 2872 { 2873 struct ip6_dest *dest, **newdest = NULL; 2874 int destlen; 2875 2876 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2877 error = priv_check_cred(cred, 2878 PRIV_NETINET_SETHDROPTS, 0); 2879 if (error) 2880 return (error); 2881 } 2882 2883 if (len == 0) { 2884 ip6_clearpktopts(opt, optname); 2885 break; /* just remove the option */ 2886 } 2887 2888 /* message length validation */ 2889 if (len < sizeof(struct ip6_dest)) 2890 return (EINVAL); 2891 dest = (struct ip6_dest *)buf; 2892 destlen = (dest->ip6d_len + 1) << 3; 2893 if (len != destlen) 2894 return (EINVAL); 2895 2896 /* 2897 * Determine the position that the destination options header 2898 * should be inserted; before or after the routing header. 2899 */ 2900 switch (optname) { 2901 case IPV6_2292DSTOPTS: 2902 /* 2903 * The old advacned API is ambiguous on this point. 2904 * Our approach is to determine the position based 2905 * according to the existence of a routing header. 2906 * Note, however, that this depends on the order of the 2907 * extension headers in the ancillary data; the 1st 2908 * part of the destination options header must appear 2909 * before the routing header in the ancillary data, 2910 * too. 2911 * RFC3542 solved the ambiguity by introducing 2912 * separate ancillary data or option types. 2913 */ 2914 if (opt->ip6po_rthdr == NULL) 2915 newdest = &opt->ip6po_dest1; 2916 else 2917 newdest = &opt->ip6po_dest2; 2918 break; 2919 case IPV6_RTHDRDSTOPTS: 2920 newdest = &opt->ip6po_dest1; 2921 break; 2922 case IPV6_DSTOPTS: 2923 newdest = &opt->ip6po_dest2; 2924 break; 2925 } 2926 2927 /* turn off the previous option, then set the new option. */ 2928 ip6_clearpktopts(opt, optname); 2929 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2930 if (*newdest == NULL) 2931 return (ENOBUFS); 2932 bcopy(dest, *newdest, destlen); 2933 2934 break; 2935 } 2936 2937 case IPV6_2292RTHDR: 2938 case IPV6_RTHDR: 2939 { 2940 struct ip6_rthdr *rth; 2941 int rthlen; 2942 2943 if (len == 0) { 2944 ip6_clearpktopts(opt, IPV6_RTHDR); 2945 break; /* just remove the option */ 2946 } 2947 2948 /* message length validation */ 2949 if (len < sizeof(struct ip6_rthdr)) 2950 return (EINVAL); 2951 rth = (struct ip6_rthdr *)buf; 2952 rthlen = (rth->ip6r_len + 1) << 3; 2953 if (len != rthlen) 2954 return (EINVAL); 2955 2956 switch (rth->ip6r_type) { 2957 case IPV6_RTHDR_TYPE_0: 2958 if (rth->ip6r_len == 0) /* must contain one addr */ 2959 return (EINVAL); 2960 if (rth->ip6r_len % 2) /* length must be even */ 2961 return (EINVAL); 2962 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2963 return (EINVAL); 2964 break; 2965 default: 2966 return (EINVAL); /* not supported */ 2967 } 2968 2969 /* turn off the previous option */ 2970 ip6_clearpktopts(opt, IPV6_RTHDR); 2971 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2972 if (opt->ip6po_rthdr == NULL) 2973 return (ENOBUFS); 2974 bcopy(rth, opt->ip6po_rthdr, rthlen); 2975 2976 break; 2977 } 2978 2979 case IPV6_USE_MIN_MTU: 2980 if (len != sizeof(int)) 2981 return (EINVAL); 2982 minmtupolicy = *(int *)buf; 2983 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2984 minmtupolicy != IP6PO_MINMTU_DISABLE && 2985 minmtupolicy != IP6PO_MINMTU_ALL) { 2986 return (EINVAL); 2987 } 2988 opt->ip6po_minmtu = minmtupolicy; 2989 break; 2990 2991 case IPV6_DONTFRAG: 2992 if (len != sizeof(int)) 2993 return (EINVAL); 2994 2995 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2996 /* 2997 * we ignore this option for TCP sockets. 2998 * (RFC3542 leaves this case unspecified.) 2999 */ 3000 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3001 } else 3002 opt->ip6po_flags |= IP6PO_DONTFRAG; 3003 break; 3004 3005 case IPV6_PREFER_TEMPADDR: 3006 if (len != sizeof(int)) 3007 return (EINVAL); 3008 preftemp = *(int *)buf; 3009 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3010 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3011 preftemp != IP6PO_TEMPADDR_PREFER) { 3012 return (EINVAL); 3013 } 3014 opt->ip6po_prefer_tempaddr = preftemp; 3015 break; 3016 3017 default: 3018 return (ENOPROTOOPT); 3019 } /* end of switch */ 3020 3021 return (0); 3022 } 3023 3024 /* 3025 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3026 * packet to the input queue of a specified interface. Note that this 3027 * calls the output routine of the loopback "driver", but with an interface 3028 * pointer that might NOT be &loif -- easier than replicating that code here. 3029 */ 3030 void 3031 ip6_mloopback(struct ifnet *ifp, struct mbuf *m) 3032 { 3033 struct mbuf *copym; 3034 struct ip6_hdr *ip6; 3035 3036 copym = m_copy(m, 0, M_COPYALL); 3037 if (copym == NULL) 3038 return; 3039 3040 /* 3041 * Make sure to deep-copy IPv6 header portion in case the data 3042 * is in an mbuf cluster, so that we can safely override the IPv6 3043 * header portion later. 3044 */ 3045 if (!M_WRITABLE(copym) || 3046 copym->m_len < sizeof(struct ip6_hdr)) { 3047 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3048 if (copym == NULL) 3049 return; 3050 } 3051 ip6 = mtod(copym, struct ip6_hdr *); 3052 /* 3053 * clear embedded scope identifiers if necessary. 3054 * in6_clearscope will touch the addresses only when necessary. 3055 */ 3056 in6_clearscope(&ip6->ip6_src); 3057 in6_clearscope(&ip6->ip6_dst); 3058 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3059 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3060 CSUM_PSEUDO_HDR; 3061 copym->m_pkthdr.csum_data = 0xffff; 3062 } 3063 if_simloop(ifp, copym, AF_INET6, 0); 3064 } 3065 3066 /* 3067 * Chop IPv6 header off from the payload. 3068 */ 3069 static int 3070 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3071 { 3072 struct mbuf *mh; 3073 struct ip6_hdr *ip6; 3074 3075 ip6 = mtod(m, struct ip6_hdr *); 3076 if (m->m_len > sizeof(*ip6)) { 3077 mh = m_gethdr(M_NOWAIT, MT_DATA); 3078 if (mh == NULL) { 3079 m_freem(m); 3080 return ENOBUFS; 3081 } 3082 m_move_pkthdr(mh, m); 3083 M_ALIGN(mh, sizeof(*ip6)); 3084 m->m_len -= sizeof(*ip6); 3085 m->m_data += sizeof(*ip6); 3086 mh->m_next = m; 3087 m = mh; 3088 m->m_len = sizeof(*ip6); 3089 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3090 } 3091 exthdrs->ip6e_ip6 = m; 3092 return 0; 3093 } 3094 3095 /* 3096 * Compute IPv6 extension header length. 3097 */ 3098 int 3099 ip6_optlen(struct inpcb *in6p) 3100 { 3101 int len; 3102 3103 if (!in6p->in6p_outputopts) 3104 return 0; 3105 3106 len = 0; 3107 #define elen(x) \ 3108 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3109 3110 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3111 if (in6p->in6p_outputopts->ip6po_rthdr) 3112 /* dest1 is valid with rthdr only */ 3113 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3114 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3115 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3116 return len; 3117 #undef elen 3118 }
Cache object: e0dc77617cb5830e9299a1a7d9e05237
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]