1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 */ 62 63 #include "opt_inet.h" 64 #include "opt_inet6.h" 65 #include "opt_ipsec.h" 66 #include "opt_kern_tls.h" 67 #include "opt_ratelimit.h" 68 #include "opt_rss.h" 69 #include "opt_sctp.h" 70 71 #include <sys/param.h> 72 #include <sys/kernel.h> 73 #include <sys/ktls.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/priv.h> 78 #include <sys/proc.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/syslog.h> 83 #include <sys/ucred.h> 84 85 #include <machine/in_cksum.h> 86 87 #include <net/if.h> 88 #include <net/if_var.h> 89 #include <net/if_private.h> 90 #include <net/if_vlan_var.h> 91 #include <net/if_llatbl.h> 92 #include <net/ethernet.h> 93 #include <net/netisr.h> 94 #include <net/route.h> 95 #include <net/route/nhop.h> 96 #include <net/pfil.h> 97 #include <net/rss_config.h> 98 #include <net/vnet.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_var.h> 102 #include <netinet/ip_var.h> 103 #include <netinet6/in6_fib.h> 104 #include <netinet6/in6_var.h> 105 #include <netinet/ip6.h> 106 #include <netinet/icmp6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet/in_pcb.h> 109 #include <netinet/tcp_var.h> 110 #include <netinet6/nd6.h> 111 #include <netinet6/in6_rss.h> 112 #include <netinet6/ip6_mroute.h> 113 114 #include <netipsec/ipsec_support.h> 115 #if defined(SCTP) || defined(SCTP_SUPPORT) 116 #include <netinet/sctp.h> 117 #include <netinet/sctp_crc32.h> 118 #endif 119 120 #include <netinet6/scope6_var.h> 121 122 extern int in6_mcast_loop; 123 124 struct ip6_exthdrs { 125 struct mbuf *ip6e_ip6; 126 struct mbuf *ip6e_hbh; 127 struct mbuf *ip6e_dest1; 128 struct mbuf *ip6e_rthdr; 129 struct mbuf *ip6e_dest2; 130 }; 131 132 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options"); 133 134 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 135 struct ucred *, int); 136 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 137 struct socket *, struct sockopt *); 138 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *); 139 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 140 struct ucred *, int, int, int); 141 142 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 143 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 144 struct ip6_frag **); 145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146 static void ip6_getpmtu(struct route_in6 *, int, 147 struct ifnet *, const struct in6_addr *, u_long *, u_int, u_int); 148 static void ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long, 149 u_long *, u_int); 150 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *); 151 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 152 153 /* 154 * Make an extension header from option data. hp is the source, 155 * mp is the destination, and _ol is the optlen. 156 */ 157 #define MAKE_EXTHDR(hp, mp, _ol) \ 158 do { \ 159 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 160 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 161 ((eh)->ip6e_len + 1) << 3); \ 162 if (error) \ 163 goto freehdrs; \ 164 (_ol) += (*(mp))->m_len; \ 165 } while (/*CONSTCOND*/ 0) 166 167 /* 168 * Form a chain of extension headers. 169 * m is the extension header mbuf 170 * mp is the previous mbuf in the chain 171 * p is the next header 172 * i is the type of option. 173 */ 174 #define MAKE_CHAIN(m, mp, p, i)\ 175 do {\ 176 if (m) {\ 177 if (!hdrsplit) \ 178 panic("%s:%d: assumption failed: "\ 179 "hdr not split: hdrsplit %d exthdrs %p",\ 180 __func__, __LINE__, hdrsplit, &exthdrs);\ 181 *mtod((m), u_char *) = *(p);\ 182 *(p) = (i);\ 183 p = mtod((m), u_char *);\ 184 (m)->m_next = (mp)->m_next;\ 185 (mp)->m_next = (m);\ 186 (mp) = (m);\ 187 }\ 188 } while (/*CONSTCOND*/ 0) 189 190 void 191 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 192 { 193 u_short csum; 194 195 csum = in_cksum_skip(m, offset + plen, offset); 196 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 197 csum = 0xffff; 198 offset += m->m_pkthdr.csum_data; /* checksum offset */ 199 200 if (offset + sizeof(csum) > m->m_len) 201 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 202 else 203 *(u_short *)mtodo(m, offset) = csum; 204 } 205 206 static void 207 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags, 208 int plen, int optlen) 209 { 210 211 KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p " 212 "csum_flags %#x", 213 __func__, __LINE__, plen, optlen, m, ifp, csum_flags)); 214 215 if (csum_flags & CSUM_DELAY_DATA_IPV6) { 216 in6_delayed_cksum(m, plen - optlen, 217 sizeof(struct ip6_hdr) + optlen); 218 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 219 } 220 #if defined(SCTP) || defined(SCTP_SUPPORT) 221 if (csum_flags & CSUM_SCTP_IPV6) { 222 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen); 223 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 224 } 225 #endif 226 } 227 228 int 229 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 230 int fraglen , uint32_t id) 231 { 232 struct mbuf *m, **mnext, *m_frgpart; 233 struct ip6_hdr *ip6, *mhip6; 234 struct ip6_frag *ip6f; 235 int off; 236 int error; 237 int tlen = m0->m_pkthdr.len; 238 239 KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8")); 240 241 m = m0; 242 ip6 = mtod(m, struct ip6_hdr *); 243 mnext = &m->m_nextpkt; 244 245 for (off = hlen; off < tlen; off += fraglen) { 246 m = m_gethdr(M_NOWAIT, MT_DATA); 247 if (!m) { 248 IP6STAT_INC(ip6s_odropped); 249 return (ENOBUFS); 250 } 251 252 /* 253 * Make sure the complete packet header gets copied 254 * from the originating mbuf to the newly created 255 * mbuf. This also ensures that existing firewall 256 * classification(s), VLAN tags and so on get copied 257 * to the resulting fragmented packet(s): 258 */ 259 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 260 m_free(m); 261 IP6STAT_INC(ip6s_odropped); 262 return (ENOBUFS); 263 } 264 265 *mnext = m; 266 mnext = &m->m_nextpkt; 267 m->m_data += max_linkhdr; 268 mhip6 = mtod(m, struct ip6_hdr *); 269 *mhip6 = *ip6; 270 m->m_len = sizeof(*mhip6); 271 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 272 if (error) { 273 IP6STAT_INC(ip6s_odropped); 274 return (error); 275 } 276 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 277 if (off + fraglen >= tlen) 278 fraglen = tlen - off; 279 else 280 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 281 mhip6->ip6_plen = htons((u_short)(fraglen + hlen + 282 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 283 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) { 284 IP6STAT_INC(ip6s_odropped); 285 return (ENOBUFS); 286 } 287 m_cat(m, m_frgpart); 288 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f); 289 ip6f->ip6f_reserved = 0; 290 ip6f->ip6f_ident = id; 291 ip6f->ip6f_nxt = nextproto; 292 IP6STAT_INC(ip6s_ofragments); 293 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 294 } 295 296 return (0); 297 } 298 299 static int 300 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp, 301 struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro, 302 bool stamp_tag) 303 { 304 #ifdef KERN_TLS 305 struct ktls_session *tls = NULL; 306 #endif 307 struct m_snd_tag *mst; 308 int error; 309 310 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 311 mst = NULL; 312 313 #ifdef KERN_TLS 314 /* 315 * If this is an unencrypted TLS record, save a reference to 316 * the record. This local reference is used to call 317 * ktls_output_eagain after the mbuf has been freed (thus 318 * dropping the mbuf's reference) in if_output. 319 */ 320 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) { 321 tls = ktls_hold(m->m_next->m_epg_tls); 322 mst = tls->snd_tag; 323 324 /* 325 * If a TLS session doesn't have a valid tag, it must 326 * have had an earlier ifp mismatch, so drop this 327 * packet. 328 */ 329 if (mst == NULL) { 330 m_freem(m); 331 error = EAGAIN; 332 goto done; 333 } 334 /* 335 * Always stamp tags that include NIC ktls. 336 */ 337 stamp_tag = true; 338 } 339 #endif 340 #ifdef RATELIMIT 341 if (inp != NULL && mst == NULL) { 342 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 || 343 (inp->inp_snd_tag != NULL && 344 inp->inp_snd_tag->ifp != ifp)) 345 in_pcboutput_txrtlmt(inp, ifp, m); 346 347 if (inp->inp_snd_tag != NULL) 348 mst = inp->inp_snd_tag; 349 } 350 #endif 351 if (stamp_tag && mst != NULL) { 352 KASSERT(m->m_pkthdr.rcvif == NULL, 353 ("trying to add a send tag to a forwarded packet")); 354 if (mst->ifp != ifp) { 355 m_freem(m); 356 error = EAGAIN; 357 goto done; 358 } 359 360 /* stamp send tag on mbuf */ 361 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 362 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 363 } 364 365 error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro); 366 367 done: 368 /* Check for route change invalidating send tags. */ 369 #ifdef KERN_TLS 370 if (tls != NULL) { 371 if (error == EAGAIN) 372 error = ktls_output_eagain(inp, tls); 373 ktls_free(tls); 374 } 375 #endif 376 #ifdef RATELIMIT 377 if (error == EAGAIN) 378 in_pcboutput_eagain(inp); 379 #endif 380 return (error); 381 } 382 383 /* 384 * IP6 output. 385 * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len, 386 * nxt, hlim, src, dst). 387 * This function may modify ver and hlim only. 388 * The mbuf chain containing the packet will be freed. 389 * The mbuf opt, if present, will not be freed. 390 * If route_in6 ro is present and has ro_nh initialized, route lookup would be 391 * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL, 392 * then result of route lookup is stored in ro->ro_nh. 393 * 394 * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu 395 * is uint32_t. So we use u_long to hold largest one, which is rt_mtu. 396 * 397 * ifpp - XXX: just for statistics 398 */ 399 int 400 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 401 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 402 struct ifnet **ifpp, struct inpcb *inp) 403 { 404 struct ip6_hdr *ip6; 405 struct ifnet *ifp, *origifp; 406 struct mbuf *m = m0; 407 struct mbuf *mprev; 408 struct route_in6 *ro_pmtu; 409 struct nhop_object *nh; 410 struct sockaddr_in6 *dst, sin6, src_sa, dst_sa; 411 struct in6_addr odst; 412 u_char *nexthdrp; 413 int tlen, len; 414 int error = 0; 415 int vlan_pcp = -1; 416 struct in6_ifaddr *ia = NULL; 417 u_long mtu; 418 int dontfrag; 419 u_int32_t optlen, plen = 0, unfragpartlen; 420 struct ip6_exthdrs exthdrs; 421 struct in6_addr src0, dst0; 422 u_int32_t zone; 423 bool hdrsplit; 424 int sw_csum, tso; 425 int needfiblookup; 426 uint32_t fibnum; 427 struct m_tag *fwd_tag = NULL; 428 uint32_t id; 429 uint32_t optvalid; 430 431 NET_EPOCH_ASSERT(); 432 433 if (inp != NULL) { 434 INP_LOCK_ASSERT(inp); 435 M_SETFIB(m, inp->inp_inc.inc_fibnum); 436 if ((flags & IP_NODEFAULTFLOWID) == 0) { 437 /* Unconditionally set flowid. */ 438 m->m_pkthdr.flowid = inp->inp_flowid; 439 M_HASHTYPE_SET(m, inp->inp_flowtype); 440 } 441 if ((inp->inp_flags2 & INP_2PCP_SET) != 0) 442 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >> 443 INP_2PCP_SHIFT; 444 #ifdef NUMA 445 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 446 #endif 447 } 448 449 /* Source address validation. */ 450 ip6 = mtod(m, struct ip6_hdr *); 451 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 452 (flags & IPV6_UNSPECSRC) == 0) { 453 error = EOPNOTSUPP; 454 IP6STAT_INC(ip6s_badscope); 455 goto bad; 456 } 457 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 458 error = EOPNOTSUPP; 459 IP6STAT_INC(ip6s_badscope); 460 goto bad; 461 } 462 463 /* 464 * If we are given packet options to add extension headers prepare them. 465 * Calculate the total length of the extension header chain. 466 * Keep the length of the unfragmentable part for fragmentation. 467 */ 468 bzero(&exthdrs, sizeof(exthdrs)); 469 optlen = optvalid = 0; 470 unfragpartlen = sizeof(struct ip6_hdr); 471 if (opt) { 472 optvalid = opt->ip6po_valid; 473 474 /* Hop-by-Hop options header. */ 475 if ((optvalid & IP6PO_VALID_HBH) != 0) 476 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen); 477 478 /* Destination options header (1st part). */ 479 if ((optvalid & IP6PO_VALID_RHINFO) != 0) { 480 #ifndef RTHDR_SUPPORT_IMPLEMENTED 481 /* 482 * If there is a routing header, discard the packet 483 * right away here. RH0/1 are obsolete and we do not 484 * currently support RH2/3/4. 485 * People trying to use RH253/254 may want to disable 486 * this check. 487 * The moment we do support any routing header (again) 488 * this block should check the routing type more 489 * selectively. 490 */ 491 error = EINVAL; 492 goto bad; 493 #endif 494 495 /* 496 * Destination options header (1st part). 497 * This only makes sense with a routing header. 498 * See Section 9.2 of RFC 3542. 499 * Disabling this part just for MIP6 convenience is 500 * a bad idea. We need to think carefully about a 501 * way to make the advanced API coexist with MIP6 502 * options, which might automatically be inserted in 503 * the kernel. 504 */ 505 if ((optvalid & IP6PO_VALID_DEST1) != 0) 506 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1, 507 optlen); 508 } 509 /* Routing header. */ 510 if ((optvalid & IP6PO_VALID_RHINFO) != 0) 511 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen); 512 513 unfragpartlen += optlen; 514 515 /* 516 * NOTE: we don't add AH/ESP length here (done in 517 * ip6_ipsec_output()). 518 */ 519 520 /* Destination options header (2nd part). */ 521 if ((optvalid & IP6PO_VALID_DEST2) != 0) 522 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen); 523 } 524 525 /* 526 * If there is at least one extension header, 527 * separate IP6 header from the payload. 528 */ 529 hdrsplit = false; 530 if (optlen) { 531 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 532 m = NULL; 533 goto freehdrs; 534 } 535 m = exthdrs.ip6e_ip6; 536 ip6 = mtod(m, struct ip6_hdr *); 537 hdrsplit = true; 538 } 539 540 /* Adjust mbuf packet header length. */ 541 m->m_pkthdr.len += optlen; 542 plen = m->m_pkthdr.len - sizeof(*ip6); 543 544 if (plen > IPV6_MAXPACKET) { 545 error = EMSGSIZE; 546 goto freehdrs; 547 } else 548 ip6->ip6_plen = htons(plen); 549 nexthdrp = &ip6->ip6_nxt; 550 551 if (optlen) { 552 /* 553 * Concatenate headers and fill in next header fields. 554 * Here we have, on "m" 555 * IPv6 payload 556 * and we insert headers accordingly. 557 * Finally, we should be getting: 558 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]. 559 * 560 * During the header composing process "m" points to IPv6 561 * header. "mprev" points to an extension header prior to esp. 562 */ 563 mprev = m; 564 565 /* 566 * We treat dest2 specially. This makes IPsec processing 567 * much easier. The goal here is to make mprev point the 568 * mbuf prior to dest2. 569 * 570 * Result: IPv6 dest2 payload. 571 * m and mprev will point to IPv6 header. 572 */ 573 if (exthdrs.ip6e_dest2) { 574 if (!hdrsplit) 575 panic("%s:%d: assumption failed: " 576 "hdr not split: hdrsplit %d exthdrs %p", 577 __func__, __LINE__, hdrsplit, &exthdrs); 578 exthdrs.ip6e_dest2->m_next = m->m_next; 579 m->m_next = exthdrs.ip6e_dest2; 580 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 581 ip6->ip6_nxt = IPPROTO_DSTOPTS; 582 } 583 584 /* 585 * Result: IPv6 hbh dest1 rthdr dest2 payload. 586 * m will point to IPv6 header. mprev will point to the 587 * extension header prior to dest2 (rthdr in the above case). 588 */ 589 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 590 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 591 IPPROTO_DSTOPTS); 592 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 593 IPPROTO_ROUTING); 594 } 595 596 IP6STAT_INC(ip6s_localout); 597 598 /* Route packet. */ 599 ro_pmtu = ro; 600 if ((optvalid & IP6PO_VALID_RHINFO) != 0) 601 ro = &opt->ip6po_route; 602 if (ro != NULL) 603 dst = (struct sockaddr_in6 *)&ro->ro_dst; 604 else 605 dst = &sin6; 606 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 607 608 again: 609 /* 610 * If specified, try to fill in the traffic class field. 611 * Do not override if a non-zero value is already set. 612 * We check the diffserv field and the ECN field separately. 613 */ 614 if ((optvalid & IP6PO_VALID_TC) != 0){ 615 int mask = 0; 616 617 if (IPV6_DSCP(ip6) == 0) 618 mask |= 0xfc; 619 if (IPV6_ECN(ip6) == 0) 620 mask |= 0x03; 621 if (mask != 0) 622 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 623 } 624 625 /* Fill in or override the hop limit field, if necessary. */ 626 if ((optvalid & IP6PO_VALID_HLIM) != 0) 627 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 628 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 629 if (im6o != NULL) 630 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 631 else 632 ip6->ip6_hlim = V_ip6_defmcasthlim; 633 } 634 635 if (ro == NULL || ro->ro_nh == NULL) { 636 bzero(dst, sizeof(*dst)); 637 dst->sin6_family = AF_INET6; 638 dst->sin6_len = sizeof(*dst); 639 dst->sin6_addr = ip6->ip6_dst; 640 } 641 /* 642 * Validate route against routing table changes. 643 * Make sure that the address family is set in route. 644 */ 645 nh = NULL; 646 ifp = NULL; 647 mtu = 0; 648 if (ro != NULL) { 649 if (ro->ro_nh != NULL && inp != NULL) { 650 ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */ 651 NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, 652 fibnum); 653 } 654 if (ro->ro_nh != NULL && fwd_tag == NULL && 655 (!NH_IS_VALID(ro->ro_nh) || 656 ro->ro_dst.sin6_family != AF_INET6 || 657 !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst))) 658 RO_INVALIDATE_CACHE(ro); 659 660 if (ro->ro_nh != NULL && fwd_tag == NULL && 661 ro->ro_dst.sin6_family == AF_INET6 && 662 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) { 663 /* Nexthop is valid and contains valid ifp */ 664 nh = ro->ro_nh; 665 } else { 666 if (ro->ro_lle) 667 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 668 ro->ro_lle = NULL; 669 if (fwd_tag == NULL) { 670 bzero(&dst_sa, sizeof(dst_sa)); 671 dst_sa.sin6_family = AF_INET6; 672 dst_sa.sin6_len = sizeof(dst_sa); 673 dst_sa.sin6_addr = ip6->ip6_dst; 674 } 675 error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp, 676 &nh, fibnum, m->m_pkthdr.flowid); 677 if (error != 0) { 678 IP6STAT_INC(ip6s_noroute); 679 if (ifp != NULL) 680 in6_ifstat_inc(ifp, ifs6_out_discard); 681 goto bad; 682 } 683 /* 684 * At this point at least @ifp is not NULL 685 * Can be the case when dst is multicast, link-local or 686 * interface is explicitly specificed by the caller. 687 */ 688 } 689 if (nh == NULL) { 690 /* 691 * If in6_selectroute() does not return a nexthop 692 * dst may not have been updated. 693 */ 694 *dst = dst_sa; /* XXX */ 695 origifp = ifp; 696 mtu = ifp->if_mtu; 697 } else { 698 ifp = nh->nh_ifp; 699 origifp = nh->nh_aifp; 700 ia = (struct in6_ifaddr *)(nh->nh_ifa); 701 counter_u64_add(nh->nh_pksent, 1); 702 } 703 } else { 704 struct nhop_object *nh; 705 struct in6_addr kdst; 706 uint32_t scopeid; 707 708 if (fwd_tag == NULL) { 709 bzero(&dst_sa, sizeof(dst_sa)); 710 dst_sa.sin6_family = AF_INET6; 711 dst_sa.sin6_len = sizeof(dst_sa); 712 dst_sa.sin6_addr = ip6->ip6_dst; 713 } 714 715 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) && 716 im6o != NULL && 717 (ifp = im6o->im6o_multicast_ifp) != NULL) { 718 /* We do not need a route lookup. */ 719 *dst = dst_sa; /* XXX */ 720 origifp = ifp; 721 goto nonh6lookup; 722 } 723 724 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid); 725 726 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) || 727 IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) { 728 if (scopeid > 0) { 729 ifp = in6_getlinkifnet(scopeid); 730 if (ifp == NULL) { 731 error = EHOSTUNREACH; 732 goto bad; 733 } 734 *dst = dst_sa; /* XXX */ 735 origifp = ifp; 736 goto nonh6lookup; 737 } 738 } 739 740 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 741 m->m_pkthdr.flowid); 742 if (nh == NULL) { 743 IP6STAT_INC(ip6s_noroute); 744 /* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */ 745 error = EHOSTUNREACH; 746 goto bad; 747 } 748 749 ifp = nh->nh_ifp; 750 origifp = nh->nh_aifp; 751 ia = ifatoia6(nh->nh_ifa); 752 if (nh->nh_flags & NHF_GATEWAY) 753 dst->sin6_addr = nh->gw6_sa.sin6_addr; 754 else if (fwd_tag != NULL) 755 dst->sin6_addr = dst_sa.sin6_addr; 756 nonh6lookup: 757 ; 758 } 759 /* 760 * At this point ifp MUST be pointing to the valid transmit ifp. 761 * origifp MUST be valid and pointing to either the same ifp or, 762 * in case of loopback output, to the interface which ip6_src 763 * belongs to. 764 * Examples: 765 * fe80::1%em0 -> fe80::2%em0 -> ifp=em0, origifp=em0 766 * fe80::1%em0 -> fe80::1%em0 -> ifp=lo0, origifp=em0 767 * ::1 -> ::1 -> ifp=lo0, origifp=lo0 768 * 769 * mtu can be 0 and will be refined later. 770 */ 771 KASSERT((ifp != NULL), ("output interface must not be NULL")); 772 KASSERT((origifp != NULL), ("output address interface must not be NULL")); 773 774 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 775 /* 776 * IPSec checking which handles several cases. 777 * FAST IPSEC: We re-injected the packet. 778 * XXX: need scope argument. 779 */ 780 if (IPSEC_ENABLED(ipv6)) { 781 if ((error = IPSEC_OUTPUT(ipv6, ifp, m, inp, mtu == 0 ? 782 ifp->if_mtu : mtu)) != 0) { 783 if (error == EINPROGRESS) 784 error = 0; 785 goto done; 786 } 787 } 788 #endif /* IPSEC */ 789 790 if ((flags & IPV6_FORWARDING) == 0) { 791 /* XXX: the FORWARDING flag can be set for mrouting. */ 792 in6_ifstat_inc(ifp, ifs6_out_request); 793 } 794 795 /* Setup data structures for scope ID checks. */ 796 src0 = ip6->ip6_src; 797 bzero(&src_sa, sizeof(src_sa)); 798 src_sa.sin6_family = AF_INET6; 799 src_sa.sin6_len = sizeof(src_sa); 800 src_sa.sin6_addr = ip6->ip6_src; 801 802 dst0 = ip6->ip6_dst; 803 /* Re-initialize to be sure. */ 804 bzero(&dst_sa, sizeof(dst_sa)); 805 dst_sa.sin6_family = AF_INET6; 806 dst_sa.sin6_len = sizeof(dst_sa); 807 dst_sa.sin6_addr = ip6->ip6_dst; 808 809 /* Check for valid scope ID. */ 810 if (in6_setscope(&src0, origifp, &zone) == 0 && 811 sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id && 812 in6_setscope(&dst0, origifp, &zone) == 0 && 813 sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) { 814 /* 815 * The outgoing interface is in the zone of the source 816 * and destination addresses. 817 * 818 */ 819 } else if ((origifp->if_flags & IFF_LOOPBACK) == 0 || 820 sa6_recoverscope(&src_sa) != 0 || 821 sa6_recoverscope(&dst_sa) != 0 || 822 dst_sa.sin6_scope_id == 0 || 823 (src_sa.sin6_scope_id != 0 && 824 src_sa.sin6_scope_id != dst_sa.sin6_scope_id) || 825 ifnet_byindex(dst_sa.sin6_scope_id) == NULL) { 826 /* 827 * If the destination network interface is not a 828 * loopback interface, or the destination network 829 * address has no scope ID, or the source address has 830 * a scope ID set which is different from the 831 * destination address one, or there is no network 832 * interface representing this scope ID, the address 833 * pair is considered invalid. 834 */ 835 IP6STAT_INC(ip6s_badscope); 836 in6_ifstat_inc(origifp, ifs6_out_discard); 837 if (error == 0) 838 error = EHOSTUNREACH; /* XXX */ 839 goto bad; 840 } 841 /* All scope ID checks are successful. */ 842 843 if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 844 if ((optvalid & IP6PO_VALID_NHINFO) != 0) { 845 /* 846 * The nexthop is explicitly specified by the 847 * application. We assume the next hop is an IPv6 848 * address. 849 */ 850 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 851 } 852 else if ((nh->nh_flags & NHF_GATEWAY)) 853 dst = &nh->gw6_sa; 854 } 855 856 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 857 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */ 858 } else { 859 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 860 in6_ifstat_inc(ifp, ifs6_out_mcast); 861 862 /* Confirm that the outgoing interface supports multicast. */ 863 if (!(ifp->if_flags & IFF_MULTICAST)) { 864 IP6STAT_INC(ip6s_noroute); 865 in6_ifstat_inc(ifp, ifs6_out_discard); 866 error = ENETUNREACH; 867 goto bad; 868 } 869 if ((im6o == NULL && in6_mcast_loop) || 870 (im6o && im6o->im6o_multicast_loop)) { 871 /* 872 * Loop back multicast datagram if not expressly 873 * forbidden to do so, even if we have not joined 874 * the address; protocols will filter it later, 875 * thus deferring a hash lookup and lock acquisition 876 * at the expense of an m_copym(). 877 */ 878 ip6_mloopback(ifp, m); 879 } else { 880 /* 881 * If we are acting as a multicast router, perform 882 * multicast forwarding as if the packet had just 883 * arrived on the interface to which we are about 884 * to send. The multicast forwarding function 885 * recursively calls this function, using the 886 * IPV6_FORWARDING flag to prevent infinite recursion. 887 * 888 * Multicasts that are looped back by ip6_mloopback(), 889 * above, will be forwarded by the ip6_input() routine, 890 * if necessary. 891 */ 892 if (V_ip6_mrouting_enabled && 893 (flags & IPV6_FORWARDING) == 0) { 894 /* 895 * XXX: ip6_mforward expects that rcvif is NULL 896 * when it is called from the originating path. 897 * However, it may not always be the case. 898 */ 899 m->m_pkthdr.rcvif = NULL; 900 if (ip6_mforward(ip6, ifp, m) != 0) { 901 m_freem(m); 902 goto done; 903 } 904 } 905 } 906 /* 907 * Multicasts with a hoplimit of zero may be looped back, 908 * above, but must not be transmitted on a network. 909 * Also, multicasts addressed to the loopback interface 910 * are not sent -- the above call to ip6_mloopback() will 911 * loop back a copy if this host actually belongs to the 912 * destination group on the loopback interface. 913 */ 914 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 915 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 916 m_freem(m); 917 goto done; 918 } 919 } 920 921 /* 922 * Fill the outgoing inteface to tell the upper layer 923 * to increment per-interface statistics. 924 */ 925 if (ifpp) 926 *ifpp = ifp; 927 928 /* Determine path MTU. */ 929 ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, &mtu, fibnum, 930 *nexthdrp); 931 KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p fibnum %u", 932 __func__, __LINE__, mtu, ro_pmtu, ro, ifp, fibnum)); 933 934 /* 935 * The caller of this function may specify to use the minimum MTU 936 * in some cases. 937 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 938 * setting. The logic is a bit complicated; by default, unicast 939 * packets will follow path MTU while multicast packets will be sent at 940 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 941 * including unicast ones will be sent at the minimum MTU. Multicast 942 * packets will always be sent at the minimum MTU unless 943 * IP6PO_MINMTU_DISABLE is explicitly specified. 944 * See RFC 3542 for more details. 945 */ 946 if (mtu > IPV6_MMTU) { 947 if ((flags & IPV6_MINMTU)) 948 mtu = IPV6_MMTU; 949 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 950 mtu = IPV6_MMTU; 951 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 952 (opt == NULL || 953 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 954 mtu = IPV6_MMTU; 955 } 956 } 957 958 /* 959 * Clear embedded scope identifiers if necessary. 960 * in6_clearscope() will touch the addresses only when necessary. 961 */ 962 in6_clearscope(&ip6->ip6_src); 963 in6_clearscope(&ip6->ip6_dst); 964 965 /* 966 * If the outgoing packet contains a hop-by-hop options header, 967 * it must be examined and processed even by the source node. 968 * (RFC 2460, section 4.) 969 */ 970 if (exthdrs.ip6e_hbh) { 971 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 972 u_int32_t dummy; /* XXX unused */ 973 974 #ifdef DIAGNOSTIC 975 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 976 panic("ip6e_hbh is not contiguous"); 977 #endif 978 /* 979 * XXX: if we have to send an ICMPv6 error to the sender, 980 * we need the M_LOOP flag since icmp6_error() expects 981 * the IPv6 and the hop-by-hop options header are 982 * contiguous unless the flag is set. 983 */ 984 m->m_flags |= M_LOOP; 985 m->m_pkthdr.rcvif = ifp; 986 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 987 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 988 &dummy) < 0) { 989 /* m was already freed at this point. */ 990 error = EINVAL;/* better error? */ 991 goto done; 992 } 993 m->m_flags &= ~M_LOOP; /* XXX */ 994 m->m_pkthdr.rcvif = NULL; 995 } 996 997 /* Jump over all PFIL processing if hooks are not active. */ 998 if (!PFIL_HOOKED_OUT(V_inet6_pfil_head)) 999 goto passout; 1000 1001 odst = ip6->ip6_dst; 1002 /* Run through list of hooks for output packets. */ 1003 switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) { 1004 case PFIL_PASS: 1005 ip6 = mtod(m, struct ip6_hdr *); 1006 break; 1007 case PFIL_DROPPED: 1008 error = EACCES; 1009 /* FALLTHROUGH */ 1010 case PFIL_CONSUMED: 1011 goto done; 1012 } 1013 1014 needfiblookup = 0; 1015 /* See if destination IP address was changed by packet filter. */ 1016 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 1017 m->m_flags |= M_SKIP_FIREWALL; 1018 /* If destination is now ourself drop to ip6_input(). */ 1019 if (in6_localip(&ip6->ip6_dst)) { 1020 m->m_flags |= M_FASTFWD_OURS; 1021 if (m->m_pkthdr.rcvif == NULL) 1022 m->m_pkthdr.rcvif = V_loif; 1023 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1024 m->m_pkthdr.csum_flags |= 1025 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 1026 m->m_pkthdr.csum_data = 0xffff; 1027 } 1028 #if defined(SCTP) || defined(SCTP_SUPPORT) 1029 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 1030 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1031 #endif 1032 error = netisr_queue(NETISR_IPV6, m); 1033 goto done; 1034 } else { 1035 if (ro != NULL) 1036 RO_INVALIDATE_CACHE(ro); 1037 needfiblookup = 1; /* Redo the routing table lookup. */ 1038 } 1039 } 1040 /* See if fib was changed by packet filter. */ 1041 if (fibnum != M_GETFIB(m)) { 1042 m->m_flags |= M_SKIP_FIREWALL; 1043 fibnum = M_GETFIB(m); 1044 if (ro != NULL) 1045 RO_INVALIDATE_CACHE(ro); 1046 needfiblookup = 1; 1047 } 1048 if (needfiblookup) 1049 goto again; 1050 1051 /* See if local, if yes, send it to netisr. */ 1052 if (m->m_flags & M_FASTFWD_OURS) { 1053 if (m->m_pkthdr.rcvif == NULL) 1054 m->m_pkthdr.rcvif = V_loif; 1055 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1056 m->m_pkthdr.csum_flags |= 1057 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 1058 m->m_pkthdr.csum_data = 0xffff; 1059 } 1060 #if defined(SCTP) || defined(SCTP_SUPPORT) 1061 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 1062 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1063 #endif 1064 error = netisr_queue(NETISR_IPV6, m); 1065 goto done; 1066 } 1067 /* Or forward to some other address? */ 1068 if ((m->m_flags & M_IP6_NEXTHOP) && 1069 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 1070 if (ro != NULL) 1071 dst = (struct sockaddr_in6 *)&ro->ro_dst; 1072 else 1073 dst = &sin6; 1074 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 1075 m->m_flags |= M_SKIP_FIREWALL; 1076 m->m_flags &= ~M_IP6_NEXTHOP; 1077 m_tag_delete(m, fwd_tag); 1078 goto again; 1079 } 1080 1081 passout: 1082 if (vlan_pcp > -1) 1083 EVL_APPLY_PRI(m, vlan_pcp); 1084 1085 /* Ensure the packet data is mapped if the interface requires it. */ 1086 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) { 1087 struct mbuf *m1; 1088 1089 error = mb_unmapped_to_ext(m, &m1); 1090 if (error != 0) { 1091 if (error == EINVAL) { 1092 if_printf(ifp, "TLS packet\n"); 1093 /* XXXKIB */ 1094 } else if (error == ENOMEM) { 1095 error = ENOBUFS; 1096 } 1097 IP6STAT_INC(ip6s_odropped); 1098 return (error); 1099 } else { 1100 m = m1; 1101 } 1102 } 1103 1104 /* 1105 * Send the packet to the outgoing interface. 1106 * If necessary, do IPv6 fragmentation before sending. 1107 * 1108 * 1: normal case (dontfrag == 0) 1109 * 1-a: send as is if tlen <= path mtu 1110 * 1-b: fragment if tlen > path mtu 1111 * 1112 * 2: if user asks us not to fragment (dontfrag == 1) 1113 * 2-a: send as is if tlen <= interface mtu 1114 * 2-b: error if tlen > interface mtu 1115 */ 1116 sw_csum = m->m_pkthdr.csum_flags; 1117 if (!hdrsplit) { 1118 tso = ((sw_csum & ifp->if_hwassist & 1119 (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0; 1120 sw_csum &= ~ifp->if_hwassist; 1121 } else 1122 tso = 0; 1123 /* 1124 * If we added extension headers, we will not do TSO and calculate the 1125 * checksums ourselves for now. 1126 * XXX-BZ Need a framework to know when the NIC can handle it, even 1127 * with ext. hdrs. 1128 */ 1129 ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen); 1130 /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */ 1131 tlen = m->m_pkthdr.len; 1132 1133 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 1134 dontfrag = 1; 1135 else 1136 dontfrag = 0; 1137 if (dontfrag && tlen > in6_ifmtu(ifp) && !tso) { /* Case 2-b. */ 1138 /* 1139 * If the DONTFRAG option is specified, we cannot send the 1140 * packet when the data length is larger than the MTU of the 1141 * outgoing interface. 1142 * Notify the error by sending IPV6_PATHMTU ancillary data if 1143 * application wanted to know the MTU value. Also return an 1144 * error code (this is not described in the API spec). 1145 */ 1146 if (inp != NULL) 1147 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 1148 error = EMSGSIZE; 1149 goto bad; 1150 } 1151 1152 /* Transmit packet without fragmentation. */ 1153 if (dontfrag || tlen <= mtu) { /* Cases 1-a and 2-a. */ 1154 struct in6_ifaddr *ia6; 1155 1156 ip6 = mtod(m, struct ip6_hdr *); 1157 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1158 if (ia6) { 1159 /* Record statistics for this interface address. */ 1160 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1); 1161 counter_u64_add(ia6->ia_ifa.ifa_obytes, 1162 m->m_pkthdr.len); 1163 } 1164 error = ip6_output_send(inp, ifp, origifp, m, dst, ro, 1165 (flags & IP_NO_SND_TAG_RL) ? false : true); 1166 goto done; 1167 } 1168 1169 /* Try to fragment the packet. Case 1-b. */ 1170 if (mtu < IPV6_MMTU) { 1171 /* Path MTU cannot be less than IPV6_MMTU. */ 1172 error = EMSGSIZE; 1173 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1174 goto bad; 1175 } else if (ip6->ip6_plen == 0) { 1176 /* We do not support jumbo payload. */ 1177 error = EMSGSIZE; 1178 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1179 goto bad; 1180 } else { 1181 u_char nextproto; 1182 1183 /* 1184 * Too large for the destination or interface; 1185 * fragment if possible. 1186 * Must be able to put at least 8 bytes per fragment. 1187 */ 1188 if (mtu > IPV6_MAXPACKET) 1189 mtu = IPV6_MAXPACKET; 1190 1191 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7; 1192 if (len < 8) { 1193 error = EMSGSIZE; 1194 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1195 goto bad; 1196 } 1197 1198 /* 1199 * If the interface will not calculate checksums on 1200 * fragmented packets, then do it here. 1201 * XXX-BZ handle the hw offloading case. Need flags. 1202 */ 1203 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen, 1204 optlen); 1205 1206 /* 1207 * Change the next header field of the last header in the 1208 * unfragmentable part. 1209 */ 1210 if (exthdrs.ip6e_rthdr) { 1211 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1212 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1213 } else if (exthdrs.ip6e_dest1) { 1214 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1215 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1216 } else if (exthdrs.ip6e_hbh) { 1217 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1218 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1219 } else { 1220 ip6 = mtod(m, struct ip6_hdr *); 1221 nextproto = ip6->ip6_nxt; 1222 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1223 } 1224 1225 /* 1226 * Loop through length of segment after first fragment, 1227 * make new header and copy data of each part and link onto 1228 * chain. 1229 */ 1230 m0 = m; 1231 id = htonl(ip6_randomid()); 1232 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id); 1233 if (error != 0) 1234 goto sendorfree; 1235 1236 in6_ifstat_inc(ifp, ifs6_out_fragok); 1237 } 1238 1239 /* Remove leading garbage. */ 1240 sendorfree: 1241 m = m0->m_nextpkt; 1242 m0->m_nextpkt = 0; 1243 m_freem(m0); 1244 for (; m; m = m0) { 1245 m0 = m->m_nextpkt; 1246 m->m_nextpkt = 0; 1247 if (error == 0) { 1248 /* Record statistics for this interface address. */ 1249 if (ia) { 1250 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 1251 counter_u64_add(ia->ia_ifa.ifa_obytes, 1252 m->m_pkthdr.len); 1253 } 1254 if (vlan_pcp > -1) 1255 EVL_APPLY_PRI(m, vlan_pcp); 1256 error = ip6_output_send(inp, ifp, origifp, m, dst, ro, 1257 true); 1258 } else 1259 m_freem(m); 1260 } 1261 1262 if (error == 0) 1263 IP6STAT_INC(ip6s_fragmented); 1264 1265 done: 1266 return (error); 1267 1268 freehdrs: 1269 m_freem(exthdrs.ip6e_hbh); /* m_freem() checks if mbuf is NULL. */ 1270 m_freem(exthdrs.ip6e_dest1); 1271 m_freem(exthdrs.ip6e_rthdr); 1272 m_freem(exthdrs.ip6e_dest2); 1273 /* FALLTHROUGH */ 1274 bad: 1275 if (m) 1276 m_freem(m); 1277 goto done; 1278 } 1279 1280 static int 1281 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1282 { 1283 struct mbuf *m; 1284 1285 if (hlen > MCLBYTES) 1286 return (ENOBUFS); /* XXX */ 1287 1288 if (hlen > MLEN) 1289 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1290 else 1291 m = m_get(M_NOWAIT, MT_DATA); 1292 if (m == NULL) 1293 return (ENOBUFS); 1294 m->m_len = hlen; 1295 if (hdr) 1296 bcopy(hdr, mtod(m, caddr_t), hlen); 1297 1298 *mp = m; 1299 return (0); 1300 } 1301 1302 /* 1303 * Insert fragment header and copy unfragmentable header portions. 1304 */ 1305 static int 1306 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1307 struct ip6_frag **frghdrp) 1308 { 1309 struct mbuf *n, *mlast; 1310 1311 if (hlen > sizeof(struct ip6_hdr)) { 1312 n = m_copym(m0, sizeof(struct ip6_hdr), 1313 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1314 if (n == NULL) 1315 return (ENOBUFS); 1316 m->m_next = n; 1317 } else 1318 n = m; 1319 1320 /* Search for the last mbuf of unfragmentable part. */ 1321 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1322 ; 1323 1324 if (M_WRITABLE(mlast) && 1325 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1326 /* use the trailing space of the last mbuf for the fragment hdr */ 1327 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1328 mlast->m_len); 1329 mlast->m_len += sizeof(struct ip6_frag); 1330 m->m_pkthdr.len += sizeof(struct ip6_frag); 1331 } else { 1332 /* allocate a new mbuf for the fragment header */ 1333 struct mbuf *mfrg; 1334 1335 mfrg = m_get(M_NOWAIT, MT_DATA); 1336 if (mfrg == NULL) 1337 return (ENOBUFS); 1338 mfrg->m_len = sizeof(struct ip6_frag); 1339 *frghdrp = mtod(mfrg, struct ip6_frag *); 1340 mlast->m_next = mfrg; 1341 } 1342 1343 return (0); 1344 } 1345 1346 /* 1347 * Calculates IPv6 path mtu for destination @dst. 1348 * Resulting MTU is stored in @mtup. 1349 * 1350 * Returns 0 on success. 1351 */ 1352 static int 1353 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup) 1354 { 1355 struct epoch_tracker et; 1356 struct nhop_object *nh; 1357 struct in6_addr kdst; 1358 uint32_t scopeid; 1359 int error; 1360 1361 in6_splitscope(dst, &kdst, &scopeid); 1362 1363 NET_EPOCH_ENTER(et); 1364 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0); 1365 if (nh != NULL) { 1366 ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, 0); 1367 error = 0; 1368 } else 1369 error = EHOSTUNREACH; 1370 NET_EPOCH_EXIT(et); 1371 1372 return (error); 1373 } 1374 1375 /* 1376 * Calculates IPv6 path MTU for @dst based on transmit @ifp, 1377 * and cached data in @ro_pmtu. 1378 * MTU from (successful) route lookup is saved (along with dst) 1379 * inside @ro_pmtu to avoid subsequent route lookups after packet 1380 * filter processing. 1381 * 1382 * Stores mtu into @mtup. 1383 */ 1384 static void 1385 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup, 1386 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup, 1387 u_int fibnum, u_int proto) 1388 { 1389 struct nhop_object *nh; 1390 struct in6_addr kdst; 1391 uint32_t scopeid; 1392 struct sockaddr_in6 *sa6_dst, sin6; 1393 u_long mtu; 1394 1395 NET_EPOCH_ASSERT(); 1396 1397 mtu = 0; 1398 if (ro_pmtu == NULL || do_lookup) { 1399 /* 1400 * Here ro_pmtu has final destination address, while 1401 * ro might represent immediate destination. 1402 * Use ro_pmtu destination since mtu might differ. 1403 */ 1404 if (ro_pmtu != NULL) { 1405 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1406 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst)) 1407 ro_pmtu->ro_mtu = 0; 1408 } else 1409 sa6_dst = &sin6; 1410 1411 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) { 1412 bzero(sa6_dst, sizeof(*sa6_dst)); 1413 sa6_dst->sin6_family = AF_INET6; 1414 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1415 sa6_dst->sin6_addr = *dst; 1416 1417 in6_splitscope(dst, &kdst, &scopeid); 1418 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0); 1419 if (nh != NULL) { 1420 mtu = nh->nh_mtu; 1421 if (ro_pmtu != NULL) 1422 ro_pmtu->ro_mtu = mtu; 1423 } 1424 } else 1425 mtu = ro_pmtu->ro_mtu; 1426 } 1427 1428 if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL) 1429 mtu = ro_pmtu->ro_nh->nh_mtu; 1430 1431 ip6_calcmtu(ifp, dst, mtu, mtup, proto); 1432 } 1433 1434 /* 1435 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and 1436 * hostcache data for @dst. 1437 * Stores mtu into @mtup. 1438 */ 1439 static void 1440 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu, 1441 u_long *mtup, u_int proto) 1442 { 1443 u_long mtu = 0; 1444 1445 if (rt_mtu > 0) { 1446 /* Skip the hostcache if the protocol handles PMTU changes. */ 1447 if (proto != IPPROTO_TCP && proto != IPPROTO_SCTP) { 1448 struct in_conninfo inc = { 1449 .inc_flags = INC_ISIPV6, 1450 .inc6_faddr = *dst, 1451 }; 1452 1453 mtu = tcp_hc_getmtu(&inc); 1454 } 1455 1456 if (mtu) 1457 mtu = min(mtu, rt_mtu); 1458 else 1459 mtu = rt_mtu; 1460 } 1461 1462 if (mtu == 0) 1463 mtu = in6_ifmtu(ifp); 1464 1465 *mtup = mtu; 1466 } 1467 1468 /* 1469 * IP6 socket option processing. 1470 */ 1471 int 1472 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1473 { 1474 int optdatalen, uproto; 1475 void *optdata; 1476 struct inpcb *inp = sotoinpcb(so); 1477 int error, optval; 1478 int level, op, optname; 1479 int optlen; 1480 struct thread *td; 1481 #ifdef RSS 1482 uint32_t rss_bucket; 1483 int retval; 1484 #endif 1485 1486 /* 1487 * Don't use more than a quarter of mbuf clusters. N.B.: 1488 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow 1489 * on LP64 architectures, so cast to u_long to avoid undefined 1490 * behavior. ILP32 architectures cannot have nmbclusters 1491 * large enough to overflow for other reasons. 1492 */ 1493 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4) 1494 1495 level = sopt->sopt_level; 1496 op = sopt->sopt_dir; 1497 optname = sopt->sopt_name; 1498 optlen = sopt->sopt_valsize; 1499 td = sopt->sopt_td; 1500 error = 0; 1501 optval = 0; 1502 uproto = (int)so->so_proto->pr_protocol; 1503 1504 if (level != IPPROTO_IPV6) { 1505 error = EINVAL; 1506 1507 if (sopt->sopt_level == SOL_SOCKET && 1508 sopt->sopt_dir == SOPT_SET) { 1509 switch (sopt->sopt_name) { 1510 case SO_SETFIB: 1511 error = sooptcopyin(sopt, &optval, 1512 sizeof(optval), sizeof(optval)); 1513 if (error != 0) 1514 break; 1515 1516 INP_WLOCK(inp); 1517 if ((inp->inp_flags & INP_BOUNDFIB) != 0 && 1518 optval != so->so_fibnum) { 1519 INP_WUNLOCK(inp); 1520 error = EISCONN; 1521 break; 1522 } 1523 error = sosetfib(inp->inp_socket, optval); 1524 if (error == 0) 1525 inp->inp_inc.inc_fibnum = optval; 1526 INP_WUNLOCK(inp); 1527 break; 1528 case SO_MAX_PACING_RATE: 1529 #ifdef RATELIMIT 1530 INP_WLOCK(inp); 1531 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1532 INP_WUNLOCK(inp); 1533 error = 0; 1534 #else 1535 error = EOPNOTSUPP; 1536 #endif 1537 break; 1538 default: 1539 break; 1540 } 1541 } 1542 } else { /* level == IPPROTO_IPV6 */ 1543 switch (op) { 1544 case SOPT_SET: 1545 switch (optname) { 1546 case IPV6_2292PKTOPTIONS: 1547 #ifdef IPV6_PKTOPTIONS 1548 case IPV6_PKTOPTIONS: 1549 #endif 1550 { 1551 struct mbuf *m; 1552 1553 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) { 1554 printf("ip6_ctloutput: mbuf limit hit\n"); 1555 error = ENOBUFS; 1556 break; 1557 } 1558 1559 error = soopt_getm(sopt, &m); /* XXX */ 1560 if (error != 0) 1561 break; 1562 error = soopt_mcopyin(sopt, m); /* XXX */ 1563 if (error != 0) 1564 break; 1565 INP_WLOCK(inp); 1566 error = ip6_pcbopts(&inp->in6p_outputopts, m, 1567 so, sopt); 1568 INP_WUNLOCK(inp); 1569 m_freem(m); /* XXX */ 1570 break; 1571 } 1572 1573 /* 1574 * Use of some Hop-by-Hop options or some 1575 * Destination options, might require special 1576 * privilege. That is, normal applications 1577 * (without special privilege) might be forbidden 1578 * from setting certain options in outgoing packets, 1579 * and might never see certain options in received 1580 * packets. [RFC 2292 Section 6] 1581 * KAME specific note: 1582 * KAME prevents non-privileged users from sending or 1583 * receiving ANY hbh/dst options in order to avoid 1584 * overhead of parsing options in the kernel. 1585 */ 1586 case IPV6_RECVHOPOPTS: 1587 case IPV6_RECVDSTOPTS: 1588 case IPV6_RECVRTHDRDSTOPTS: 1589 if (td != NULL) { 1590 error = priv_check(td, 1591 PRIV_NETINET_SETHDROPTS); 1592 if (error) 1593 break; 1594 } 1595 /* FALLTHROUGH */ 1596 case IPV6_UNICAST_HOPS: 1597 case IPV6_HOPLIMIT: 1598 1599 case IPV6_RECVPKTINFO: 1600 case IPV6_RECVHOPLIMIT: 1601 case IPV6_RECVRTHDR: 1602 case IPV6_RECVPATHMTU: 1603 case IPV6_RECVTCLASS: 1604 case IPV6_RECVFLOWID: 1605 #ifdef RSS 1606 case IPV6_RECVRSSBUCKETID: 1607 #endif 1608 case IPV6_V6ONLY: 1609 case IPV6_AUTOFLOWLABEL: 1610 case IPV6_ORIGDSTADDR: 1611 case IPV6_BINDANY: 1612 case IPV6_VLAN_PCP: 1613 if (optname == IPV6_BINDANY && td != NULL) { 1614 error = priv_check(td, 1615 PRIV_NETINET_BINDANY); 1616 if (error) 1617 break; 1618 } 1619 1620 if (optlen != sizeof(int)) { 1621 error = EINVAL; 1622 break; 1623 } 1624 error = sooptcopyin(sopt, &optval, 1625 sizeof optval, sizeof optval); 1626 if (error) 1627 break; 1628 switch (optname) { 1629 case IPV6_UNICAST_HOPS: 1630 if (optval < -1 || optval >= 256) 1631 error = EINVAL; 1632 else { 1633 /* -1 = kernel default */ 1634 inp->in6p_hops = optval; 1635 if ((inp->inp_vflag & 1636 INP_IPV4) != 0) 1637 inp->inp_ip_ttl = optval; 1638 } 1639 break; 1640 #define OPTSET(bit) \ 1641 do { \ 1642 INP_WLOCK(inp); \ 1643 if (optval) \ 1644 inp->inp_flags |= (bit); \ 1645 else \ 1646 inp->inp_flags &= ~(bit); \ 1647 INP_WUNLOCK(inp); \ 1648 } while (/*CONSTCOND*/ 0) 1649 #define OPTSET2292(bit) \ 1650 do { \ 1651 INP_WLOCK(inp); \ 1652 inp->inp_flags |= IN6P_RFC2292; \ 1653 if (optval) \ 1654 inp->inp_flags |= (bit); \ 1655 else \ 1656 inp->inp_flags &= ~(bit); \ 1657 INP_WUNLOCK(inp); \ 1658 } while (/*CONSTCOND*/ 0) 1659 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0) 1660 1661 #define OPTSET2_N(bit, val) do { \ 1662 if (val) \ 1663 inp->inp_flags2 |= bit; \ 1664 else \ 1665 inp->inp_flags2 &= ~bit; \ 1666 } while (0) 1667 #define OPTSET2(bit, val) do { \ 1668 INP_WLOCK(inp); \ 1669 OPTSET2_N(bit, val); \ 1670 INP_WUNLOCK(inp); \ 1671 } while (0) 1672 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0) 1673 #define OPTSET2292_EXCLUSIVE(bit) \ 1674 do { \ 1675 INP_WLOCK(inp); \ 1676 if (OPTBIT(IN6P_RFC2292)) { \ 1677 error = EINVAL; \ 1678 } else { \ 1679 if (optval) \ 1680 inp->inp_flags |= (bit); \ 1681 else \ 1682 inp->inp_flags &= ~(bit); \ 1683 } \ 1684 INP_WUNLOCK(inp); \ 1685 } while (/*CONSTCOND*/ 0) 1686 1687 case IPV6_RECVPKTINFO: 1688 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO); 1689 break; 1690 1691 case IPV6_HOPLIMIT: 1692 { 1693 struct ip6_pktopts **optp; 1694 1695 /* cannot mix with RFC2292 */ 1696 if (OPTBIT(IN6P_RFC2292)) { 1697 error = EINVAL; 1698 break; 1699 } 1700 INP_WLOCK(inp); 1701 optp = &inp->in6p_outputopts; 1702 error = ip6_pcbopt(IPV6_HOPLIMIT, 1703 (u_char *)&optval, sizeof(optval), 1704 optp, (td != NULL) ? td->td_ucred : 1705 NULL, uproto); 1706 INP_WUNLOCK(inp); 1707 break; 1708 } 1709 1710 case IPV6_RECVHOPLIMIT: 1711 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT); 1712 break; 1713 1714 case IPV6_RECVHOPOPTS: 1715 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS); 1716 break; 1717 1718 case IPV6_RECVDSTOPTS: 1719 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS); 1720 break; 1721 1722 case IPV6_RECVRTHDRDSTOPTS: 1723 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS); 1724 break; 1725 1726 case IPV6_RECVRTHDR: 1727 OPTSET2292_EXCLUSIVE(IN6P_RTHDR); 1728 break; 1729 1730 case IPV6_RECVPATHMTU: 1731 /* 1732 * We ignore this option for TCP 1733 * sockets. 1734 * (RFC3542 leaves this case 1735 * unspecified.) 1736 */ 1737 if (uproto != IPPROTO_TCP) 1738 OPTSET(IN6P_MTU); 1739 break; 1740 1741 case IPV6_RECVFLOWID: 1742 OPTSET2(INP_RECVFLOWID, optval); 1743 break; 1744 1745 #ifdef RSS 1746 case IPV6_RECVRSSBUCKETID: 1747 OPTSET2(INP_RECVRSSBUCKETID, optval); 1748 break; 1749 #endif 1750 1751 case IPV6_V6ONLY: 1752 INP_WLOCK(inp); 1753 if (inp->inp_lport || 1754 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 1755 /* 1756 * The socket is already bound. 1757 */ 1758 INP_WUNLOCK(inp); 1759 error = EINVAL; 1760 break; 1761 } 1762 if (optval) { 1763 inp->inp_flags |= IN6P_IPV6_V6ONLY; 1764 inp->inp_vflag &= ~INP_IPV4; 1765 } else { 1766 inp->inp_flags &= ~IN6P_IPV6_V6ONLY; 1767 inp->inp_vflag |= INP_IPV4; 1768 } 1769 INP_WUNLOCK(inp); 1770 break; 1771 case IPV6_RECVTCLASS: 1772 /* cannot mix with RFC2292 XXX */ 1773 OPTSET2292_EXCLUSIVE(IN6P_TCLASS); 1774 break; 1775 case IPV6_AUTOFLOWLABEL: 1776 OPTSET(IN6P_AUTOFLOWLABEL); 1777 break; 1778 1779 case IPV6_ORIGDSTADDR: 1780 OPTSET2(INP_ORIGDSTADDR, optval); 1781 break; 1782 case IPV6_BINDANY: 1783 OPTSET(INP_BINDANY); 1784 break; 1785 case IPV6_VLAN_PCP: 1786 if ((optval >= -1) && (optval <= 1787 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) { 1788 if (optval == -1) { 1789 INP_WLOCK(inp); 1790 inp->inp_flags2 &= 1791 ~(INP_2PCP_SET | 1792 INP_2PCP_MASK); 1793 INP_WUNLOCK(inp); 1794 } else { 1795 INP_WLOCK(inp); 1796 inp->inp_flags2 |= 1797 INP_2PCP_SET; 1798 inp->inp_flags2 &= 1799 ~INP_2PCP_MASK; 1800 inp->inp_flags2 |= 1801 optval << 1802 INP_2PCP_SHIFT; 1803 INP_WUNLOCK(inp); 1804 } 1805 } else 1806 error = EINVAL; 1807 break; 1808 } 1809 break; 1810 1811 case IPV6_TCLASS: 1812 case IPV6_DONTFRAG: 1813 case IPV6_USE_MIN_MTU: 1814 case IPV6_PREFER_TEMPADDR: 1815 if (optlen != sizeof(optval)) { 1816 error = EINVAL; 1817 break; 1818 } 1819 error = sooptcopyin(sopt, &optval, 1820 sizeof optval, sizeof optval); 1821 if (error) 1822 break; 1823 { 1824 struct ip6_pktopts **optp; 1825 INP_WLOCK(inp); 1826 optp = &inp->in6p_outputopts; 1827 error = ip6_pcbopt(optname, 1828 (u_char *)&optval, sizeof(optval), 1829 optp, (td != NULL) ? td->td_ucred : 1830 NULL, uproto); 1831 INP_WUNLOCK(inp); 1832 break; 1833 } 1834 1835 case IPV6_2292PKTINFO: 1836 case IPV6_2292HOPLIMIT: 1837 case IPV6_2292HOPOPTS: 1838 case IPV6_2292DSTOPTS: 1839 case IPV6_2292RTHDR: 1840 /* RFC 2292 */ 1841 if (optlen != sizeof(int)) { 1842 error = EINVAL; 1843 break; 1844 } 1845 error = sooptcopyin(sopt, &optval, 1846 sizeof optval, sizeof optval); 1847 if (error) 1848 break; 1849 switch (optname) { 1850 case IPV6_2292PKTINFO: 1851 OPTSET2292(IN6P_PKTINFO); 1852 break; 1853 case IPV6_2292HOPLIMIT: 1854 OPTSET2292(IN6P_HOPLIMIT); 1855 break; 1856 case IPV6_2292HOPOPTS: 1857 /* 1858 * Check super-user privilege. 1859 * See comments for IPV6_RECVHOPOPTS. 1860 */ 1861 if (td != NULL) { 1862 error = priv_check(td, 1863 PRIV_NETINET_SETHDROPTS); 1864 if (error) 1865 return (error); 1866 } 1867 OPTSET2292(IN6P_HOPOPTS); 1868 break; 1869 case IPV6_2292DSTOPTS: 1870 if (td != NULL) { 1871 error = priv_check(td, 1872 PRIV_NETINET_SETHDROPTS); 1873 if (error) 1874 return (error); 1875 } 1876 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1877 break; 1878 case IPV6_2292RTHDR: 1879 OPTSET2292(IN6P_RTHDR); 1880 break; 1881 } 1882 break; 1883 case IPV6_PKTINFO: 1884 case IPV6_HOPOPTS: 1885 case IPV6_RTHDR: 1886 case IPV6_DSTOPTS: 1887 case IPV6_RTHDRDSTOPTS: 1888 case IPV6_NEXTHOP: 1889 { 1890 /* new advanced API (RFC3542) */ 1891 u_char *optbuf; 1892 u_char optbuf_storage[MCLBYTES]; 1893 int optlen; 1894 struct ip6_pktopts **optp; 1895 1896 /* cannot mix with RFC2292 */ 1897 if (OPTBIT(IN6P_RFC2292)) { 1898 error = EINVAL; 1899 break; 1900 } 1901 1902 /* 1903 * We only ensure valsize is not too large 1904 * here. Further validation will be done 1905 * later. 1906 */ 1907 error = sooptcopyin(sopt, optbuf_storage, 1908 sizeof(optbuf_storage), 0); 1909 if (error) 1910 break; 1911 optlen = sopt->sopt_valsize; 1912 optbuf = optbuf_storage; 1913 INP_WLOCK(inp); 1914 optp = &inp->in6p_outputopts; 1915 error = ip6_pcbopt(optname, optbuf, optlen, 1916 optp, (td != NULL) ? td->td_ucred : NULL, 1917 uproto); 1918 INP_WUNLOCK(inp); 1919 break; 1920 } 1921 #undef OPTSET 1922 1923 case IPV6_MULTICAST_IF: 1924 case IPV6_MULTICAST_HOPS: 1925 case IPV6_MULTICAST_LOOP: 1926 case IPV6_JOIN_GROUP: 1927 case IPV6_LEAVE_GROUP: 1928 case IPV6_MSFILTER: 1929 case MCAST_BLOCK_SOURCE: 1930 case MCAST_UNBLOCK_SOURCE: 1931 case MCAST_JOIN_GROUP: 1932 case MCAST_LEAVE_GROUP: 1933 case MCAST_JOIN_SOURCE_GROUP: 1934 case MCAST_LEAVE_SOURCE_GROUP: 1935 error = ip6_setmoptions(inp, sopt); 1936 break; 1937 1938 case IPV6_PORTRANGE: 1939 error = sooptcopyin(sopt, &optval, 1940 sizeof optval, sizeof optval); 1941 if (error) 1942 break; 1943 1944 INP_WLOCK(inp); 1945 switch (optval) { 1946 case IPV6_PORTRANGE_DEFAULT: 1947 inp->inp_flags &= ~(INP_LOWPORT); 1948 inp->inp_flags &= ~(INP_HIGHPORT); 1949 break; 1950 1951 case IPV6_PORTRANGE_HIGH: 1952 inp->inp_flags &= ~(INP_LOWPORT); 1953 inp->inp_flags |= INP_HIGHPORT; 1954 break; 1955 1956 case IPV6_PORTRANGE_LOW: 1957 inp->inp_flags &= ~(INP_HIGHPORT); 1958 inp->inp_flags |= INP_LOWPORT; 1959 break; 1960 1961 default: 1962 error = EINVAL; 1963 break; 1964 } 1965 INP_WUNLOCK(inp); 1966 break; 1967 1968 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1969 case IPV6_IPSEC_POLICY: 1970 if (IPSEC_ENABLED(ipv6)) { 1971 error = IPSEC_PCBCTL(ipv6, inp, sopt); 1972 break; 1973 } 1974 /* FALLTHROUGH */ 1975 #endif /* IPSEC */ 1976 1977 default: 1978 error = ENOPROTOOPT; 1979 break; 1980 } 1981 break; 1982 1983 case SOPT_GET: 1984 switch (optname) { 1985 case IPV6_2292PKTOPTIONS: 1986 #ifdef IPV6_PKTOPTIONS 1987 case IPV6_PKTOPTIONS: 1988 #endif 1989 /* 1990 * RFC3542 (effectively) deprecated the 1991 * semantics of the 2292-style pktoptions. 1992 * Since it was not reliable in nature (i.e., 1993 * applications had to expect the lack of some 1994 * information after all), it would make sense 1995 * to simplify this part by always returning 1996 * empty data. 1997 */ 1998 sopt->sopt_valsize = 0; 1999 break; 2000 2001 case IPV6_RECVHOPOPTS: 2002 case IPV6_RECVDSTOPTS: 2003 case IPV6_RECVRTHDRDSTOPTS: 2004 case IPV6_UNICAST_HOPS: 2005 case IPV6_RECVPKTINFO: 2006 case IPV6_RECVHOPLIMIT: 2007 case IPV6_RECVRTHDR: 2008 case IPV6_RECVPATHMTU: 2009 2010 case IPV6_V6ONLY: 2011 case IPV6_PORTRANGE: 2012 case IPV6_RECVTCLASS: 2013 case IPV6_AUTOFLOWLABEL: 2014 case IPV6_BINDANY: 2015 case IPV6_FLOWID: 2016 case IPV6_FLOWTYPE: 2017 case IPV6_RECVFLOWID: 2018 #ifdef RSS 2019 case IPV6_RSSBUCKETID: 2020 case IPV6_RECVRSSBUCKETID: 2021 #endif 2022 case IPV6_VLAN_PCP: 2023 switch (optname) { 2024 case IPV6_RECVHOPOPTS: 2025 optval = OPTBIT(IN6P_HOPOPTS); 2026 break; 2027 2028 case IPV6_RECVDSTOPTS: 2029 optval = OPTBIT(IN6P_DSTOPTS); 2030 break; 2031 2032 case IPV6_RECVRTHDRDSTOPTS: 2033 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 2034 break; 2035 2036 case IPV6_UNICAST_HOPS: 2037 optval = inp->in6p_hops; 2038 break; 2039 2040 case IPV6_RECVPKTINFO: 2041 optval = OPTBIT(IN6P_PKTINFO); 2042 break; 2043 2044 case IPV6_RECVHOPLIMIT: 2045 optval = OPTBIT(IN6P_HOPLIMIT); 2046 break; 2047 2048 case IPV6_RECVRTHDR: 2049 optval = OPTBIT(IN6P_RTHDR); 2050 break; 2051 2052 case IPV6_RECVPATHMTU: 2053 optval = OPTBIT(IN6P_MTU); 2054 break; 2055 2056 case IPV6_V6ONLY: 2057 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2058 break; 2059 2060 case IPV6_PORTRANGE: 2061 { 2062 int flags; 2063 flags = inp->inp_flags; 2064 if (flags & INP_HIGHPORT) 2065 optval = IPV6_PORTRANGE_HIGH; 2066 else if (flags & INP_LOWPORT) 2067 optval = IPV6_PORTRANGE_LOW; 2068 else 2069 optval = 0; 2070 break; 2071 } 2072 case IPV6_RECVTCLASS: 2073 optval = OPTBIT(IN6P_TCLASS); 2074 break; 2075 2076 case IPV6_AUTOFLOWLABEL: 2077 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2078 break; 2079 2080 case IPV6_ORIGDSTADDR: 2081 optval = OPTBIT2(INP_ORIGDSTADDR); 2082 break; 2083 2084 case IPV6_BINDANY: 2085 optval = OPTBIT(INP_BINDANY); 2086 break; 2087 2088 case IPV6_FLOWID: 2089 optval = inp->inp_flowid; 2090 break; 2091 2092 case IPV6_FLOWTYPE: 2093 optval = inp->inp_flowtype; 2094 break; 2095 2096 case IPV6_RECVFLOWID: 2097 optval = OPTBIT2(INP_RECVFLOWID); 2098 break; 2099 #ifdef RSS 2100 case IPV6_RSSBUCKETID: 2101 retval = 2102 rss_hash2bucket(inp->inp_flowid, 2103 inp->inp_flowtype, 2104 &rss_bucket); 2105 if (retval == 0) 2106 optval = rss_bucket; 2107 else 2108 error = EINVAL; 2109 break; 2110 2111 case IPV6_RECVRSSBUCKETID: 2112 optval = OPTBIT2(INP_RECVRSSBUCKETID); 2113 break; 2114 #endif 2115 2116 2117 case IPV6_VLAN_PCP: 2118 if (OPTBIT2(INP_2PCP_SET)) { 2119 optval = (inp->inp_flags2 & 2120 INP_2PCP_MASK) >> 2121 INP_2PCP_SHIFT; 2122 } else { 2123 optval = -1; 2124 } 2125 break; 2126 } 2127 2128 if (error) 2129 break; 2130 error = sooptcopyout(sopt, &optval, 2131 sizeof optval); 2132 break; 2133 2134 case IPV6_PATHMTU: 2135 { 2136 u_long pmtu = 0; 2137 struct ip6_mtuinfo mtuinfo; 2138 struct in6_addr addr; 2139 2140 if (!(so->so_state & SS_ISCONNECTED)) 2141 return (ENOTCONN); 2142 /* 2143 * XXX: we dot not consider the case of source 2144 * routing, or optional information to specify 2145 * the outgoing interface. 2146 * Copy faddr out of inp to avoid holding lock 2147 * on inp during route lookup. 2148 */ 2149 INP_RLOCK(inp); 2150 bcopy(&inp->in6p_faddr, &addr, sizeof(addr)); 2151 INP_RUNLOCK(inp); 2152 error = ip6_getpmtu_ctl(so->so_fibnum, 2153 &addr, &pmtu); 2154 if (error) 2155 break; 2156 if (pmtu > IPV6_MAXPACKET) 2157 pmtu = IPV6_MAXPACKET; 2158 2159 bzero(&mtuinfo, sizeof(mtuinfo)); 2160 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2161 optdata = (void *)&mtuinfo; 2162 optdatalen = sizeof(mtuinfo); 2163 error = sooptcopyout(sopt, optdata, 2164 optdatalen); 2165 break; 2166 } 2167 2168 case IPV6_2292PKTINFO: 2169 case IPV6_2292HOPLIMIT: 2170 case IPV6_2292HOPOPTS: 2171 case IPV6_2292RTHDR: 2172 case IPV6_2292DSTOPTS: 2173 switch (optname) { 2174 case IPV6_2292PKTINFO: 2175 optval = OPTBIT(IN6P_PKTINFO); 2176 break; 2177 case IPV6_2292HOPLIMIT: 2178 optval = OPTBIT(IN6P_HOPLIMIT); 2179 break; 2180 case IPV6_2292HOPOPTS: 2181 optval = OPTBIT(IN6P_HOPOPTS); 2182 break; 2183 case IPV6_2292RTHDR: 2184 optval = OPTBIT(IN6P_RTHDR); 2185 break; 2186 case IPV6_2292DSTOPTS: 2187 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2188 break; 2189 } 2190 error = sooptcopyout(sopt, &optval, 2191 sizeof optval); 2192 break; 2193 case IPV6_PKTINFO: 2194 case IPV6_HOPOPTS: 2195 case IPV6_RTHDR: 2196 case IPV6_DSTOPTS: 2197 case IPV6_RTHDRDSTOPTS: 2198 case IPV6_NEXTHOP: 2199 case IPV6_TCLASS: 2200 case IPV6_DONTFRAG: 2201 case IPV6_USE_MIN_MTU: 2202 case IPV6_PREFER_TEMPADDR: 2203 error = ip6_getpcbopt(inp, optname, sopt); 2204 break; 2205 2206 case IPV6_MULTICAST_IF: 2207 case IPV6_MULTICAST_HOPS: 2208 case IPV6_MULTICAST_LOOP: 2209 case IPV6_MSFILTER: 2210 error = ip6_getmoptions(inp, sopt); 2211 break; 2212 2213 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 2214 case IPV6_IPSEC_POLICY: 2215 if (IPSEC_ENABLED(ipv6)) { 2216 error = IPSEC_PCBCTL(ipv6, inp, sopt); 2217 break; 2218 } 2219 /* FALLTHROUGH */ 2220 #endif /* IPSEC */ 2221 default: 2222 error = ENOPROTOOPT; 2223 break; 2224 } 2225 break; 2226 } 2227 } 2228 return (error); 2229 } 2230 2231 int 2232 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2233 { 2234 int error = 0, optval, optlen; 2235 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2236 struct inpcb *inp = sotoinpcb(so); 2237 int level, op, optname; 2238 2239 level = sopt->sopt_level; 2240 op = sopt->sopt_dir; 2241 optname = sopt->sopt_name; 2242 optlen = sopt->sopt_valsize; 2243 2244 if (level != IPPROTO_IPV6) { 2245 return (EINVAL); 2246 } 2247 2248 switch (optname) { 2249 case IPV6_CHECKSUM: 2250 /* 2251 * For ICMPv6 sockets, no modification allowed for checksum 2252 * offset, permit "no change" values to help existing apps. 2253 * 2254 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2255 * for an ICMPv6 socket will fail." 2256 * The current behavior does not meet RFC3542. 2257 */ 2258 switch (op) { 2259 case SOPT_SET: 2260 if (optlen != sizeof(int)) { 2261 error = EINVAL; 2262 break; 2263 } 2264 error = sooptcopyin(sopt, &optval, sizeof(optval), 2265 sizeof(optval)); 2266 if (error) 2267 break; 2268 if (optval < -1 || (optval % 2) != 0) { 2269 /* 2270 * The API assumes non-negative even offset 2271 * values or -1 as a special value. 2272 */ 2273 error = EINVAL; 2274 } else if (inp->inp_ip_p == IPPROTO_ICMPV6) { 2275 if (optval != icmp6off) 2276 error = EINVAL; 2277 } else 2278 inp->in6p_cksum = optval; 2279 break; 2280 2281 case SOPT_GET: 2282 if (inp->inp_ip_p == IPPROTO_ICMPV6) 2283 optval = icmp6off; 2284 else 2285 optval = inp->in6p_cksum; 2286 2287 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2288 break; 2289 2290 default: 2291 error = EINVAL; 2292 break; 2293 } 2294 break; 2295 2296 default: 2297 error = ENOPROTOOPT; 2298 break; 2299 } 2300 2301 return (error); 2302 } 2303 2304 /* 2305 * Set up IP6 options in pcb for insertion in output packets or 2306 * specifying behavior of outgoing packets. 2307 */ 2308 static int 2309 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2310 struct socket *so, struct sockopt *sopt) 2311 { 2312 struct ip6_pktopts *opt = *pktopt; 2313 int error = 0; 2314 struct thread *td = sopt->sopt_td; 2315 struct epoch_tracker et; 2316 2317 /* turn off any old options. */ 2318 if (opt) { 2319 #ifdef DIAGNOSTIC 2320 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2321 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2322 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2323 printf("ip6_pcbopts: all specified options are cleared.\n"); 2324 #endif 2325 ip6_clearpktopts(opt, -1); 2326 } else { 2327 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2328 if (opt == NULL) 2329 return (ENOMEM); 2330 } 2331 *pktopt = NULL; 2332 2333 if (!m || m->m_len == 0) { 2334 /* 2335 * Only turning off any previous options, regardless of 2336 * whether the opt is just created or given. 2337 */ 2338 free(opt, M_IP6OPT); 2339 return (0); 2340 } 2341 2342 /* set options specified by user. */ 2343 NET_EPOCH_ENTER(et); 2344 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2345 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2346 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2347 free(opt, M_IP6OPT); 2348 NET_EPOCH_EXIT(et); 2349 return (error); 2350 } 2351 NET_EPOCH_EXIT(et); 2352 *pktopt = opt; 2353 return (0); 2354 } 2355 2356 /* 2357 * initialize ip6_pktopts. beware that there are non-zero default values in 2358 * the struct. 2359 */ 2360 void 2361 ip6_initpktopts(struct ip6_pktopts *opt) 2362 { 2363 2364 bzero(opt, sizeof(*opt)); 2365 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2366 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2367 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2368 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2369 } 2370 2371 static int 2372 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2373 struct ucred *cred, int uproto) 2374 { 2375 struct epoch_tracker et; 2376 struct ip6_pktopts *opt; 2377 int ret; 2378 2379 if (*pktopt == NULL) { 2380 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2381 M_NOWAIT); 2382 if (*pktopt == NULL) 2383 return (ENOBUFS); 2384 ip6_initpktopts(*pktopt); 2385 } 2386 opt = *pktopt; 2387 2388 NET_EPOCH_ENTER(et); 2389 ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto); 2390 NET_EPOCH_EXIT(et); 2391 2392 return (ret); 2393 } 2394 2395 #define GET_PKTOPT_VAR(field, lenexpr) do { \ 2396 if (pktopt && pktopt->field) { \ 2397 INP_RUNLOCK(inp); \ 2398 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \ 2399 malloc_optdata = true; \ 2400 INP_RLOCK(inp); \ 2401 pktopt = inp->in6p_outputopts; \ 2402 if (pktopt && pktopt->field) { \ 2403 optdatalen = min(lenexpr, sopt->sopt_valsize); \ 2404 bcopy(pktopt->field, optdata, optdatalen); \ 2405 } else { \ 2406 free(optdata, M_TEMP); \ 2407 optdata = NULL; \ 2408 malloc_optdata = false; \ 2409 } \ 2410 } \ 2411 } while(0) 2412 2413 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \ 2414 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3) 2415 2416 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \ 2417 pktopt->field->sa_len) 2418 2419 static int 2420 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt) 2421 { 2422 void *optdata = NULL; 2423 bool malloc_optdata = false; 2424 int optdatalen = 0; 2425 int error = 0; 2426 struct in6_pktinfo null_pktinfo; 2427 int deftclass = 0, on; 2428 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2429 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2430 struct ip6_pktopts *pktopt; 2431 2432 INP_RLOCK(inp); 2433 pktopt = inp->in6p_outputopts; 2434 2435 switch (optname) { 2436 case IPV6_PKTINFO: 2437 optdata = (void *)&null_pktinfo; 2438 if (pktopt && pktopt->ip6po_pktinfo) { 2439 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo, 2440 sizeof(null_pktinfo)); 2441 in6_clearscope(&null_pktinfo.ipi6_addr); 2442 } else { 2443 /* XXX: we don't have to do this every time... */ 2444 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2445 } 2446 optdatalen = sizeof(struct in6_pktinfo); 2447 break; 2448 case IPV6_TCLASS: 2449 if (pktopt && pktopt->ip6po_tclass >= 0) 2450 deftclass = pktopt->ip6po_tclass; 2451 optdata = (void *)&deftclass; 2452 optdatalen = sizeof(int); 2453 break; 2454 case IPV6_HOPOPTS: 2455 GET_PKTOPT_EXT_HDR(ip6po_hbh); 2456 break; 2457 case IPV6_RTHDR: 2458 GET_PKTOPT_EXT_HDR(ip6po_rthdr); 2459 break; 2460 case IPV6_RTHDRDSTOPTS: 2461 GET_PKTOPT_EXT_HDR(ip6po_dest1); 2462 break; 2463 case IPV6_DSTOPTS: 2464 GET_PKTOPT_EXT_HDR(ip6po_dest2); 2465 break; 2466 case IPV6_NEXTHOP: 2467 GET_PKTOPT_SOCKADDR(ip6po_nexthop); 2468 break; 2469 case IPV6_USE_MIN_MTU: 2470 if (pktopt) 2471 defminmtu = pktopt->ip6po_minmtu; 2472 optdata = (void *)&defminmtu; 2473 optdatalen = sizeof(int); 2474 break; 2475 case IPV6_DONTFRAG: 2476 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2477 on = 1; 2478 else 2479 on = 0; 2480 optdata = (void *)&on; 2481 optdatalen = sizeof(on); 2482 break; 2483 case IPV6_PREFER_TEMPADDR: 2484 if (pktopt) 2485 defpreftemp = pktopt->ip6po_prefer_tempaddr; 2486 optdata = (void *)&defpreftemp; 2487 optdatalen = sizeof(int); 2488 break; 2489 default: /* should not happen */ 2490 #ifdef DIAGNOSTIC 2491 panic("ip6_getpcbopt: unexpected option\n"); 2492 #endif 2493 INP_RUNLOCK(inp); 2494 return (ENOPROTOOPT); 2495 } 2496 INP_RUNLOCK(inp); 2497 2498 error = sooptcopyout(sopt, optdata, optdatalen); 2499 if (malloc_optdata) 2500 free(optdata, M_TEMP); 2501 2502 return (error); 2503 } 2504 2505 void 2506 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2507 { 2508 if (pktopt == NULL) 2509 return; 2510 2511 if (optname == -1 || optname == IPV6_PKTINFO) { 2512 if (pktopt->ip6po_pktinfo) 2513 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2514 pktopt->ip6po_pktinfo = NULL; 2515 } 2516 if (optname == -1 || optname == IPV6_HOPLIMIT) { 2517 pktopt->ip6po_hlim = -1; 2518 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM; 2519 } 2520 if (optname == -1 || optname == IPV6_TCLASS) { 2521 pktopt->ip6po_tclass = -1; 2522 pktopt->ip6po_valid &= ~IP6PO_VALID_TC; 2523 } 2524 if (optname == -1 || optname == IPV6_NEXTHOP) { 2525 if (pktopt->ip6po_nextroute.ro_nh) { 2526 NH_FREE(pktopt->ip6po_nextroute.ro_nh); 2527 pktopt->ip6po_nextroute.ro_nh = NULL; 2528 } 2529 if (pktopt->ip6po_nexthop) 2530 free(pktopt->ip6po_nexthop, M_IP6OPT); 2531 pktopt->ip6po_nexthop = NULL; 2532 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO; 2533 } 2534 if (optname == -1 || optname == IPV6_HOPOPTS) { 2535 if (pktopt->ip6po_hbh) 2536 free(pktopt->ip6po_hbh, M_IP6OPT); 2537 pktopt->ip6po_hbh = NULL; 2538 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH; 2539 } 2540 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2541 if (pktopt->ip6po_dest1) 2542 free(pktopt->ip6po_dest1, M_IP6OPT); 2543 pktopt->ip6po_dest1 = NULL; 2544 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1; 2545 } 2546 if (optname == -1 || optname == IPV6_RTHDR) { 2547 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2548 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2549 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2550 if (pktopt->ip6po_route.ro_nh) { 2551 NH_FREE(pktopt->ip6po_route.ro_nh); 2552 pktopt->ip6po_route.ro_nh = NULL; 2553 } 2554 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO; 2555 } 2556 if (optname == -1 || optname == IPV6_DSTOPTS) { 2557 if (pktopt->ip6po_dest2) 2558 free(pktopt->ip6po_dest2, M_IP6OPT); 2559 pktopt->ip6po_dest2 = NULL; 2560 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2; 2561 } 2562 } 2563 2564 #define PKTOPT_EXTHDRCPY(type) \ 2565 do {\ 2566 if (src->type) {\ 2567 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2568 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2569 if (dst->type == NULL)\ 2570 goto bad;\ 2571 bcopy(src->type, dst->type, hlen);\ 2572 }\ 2573 } while (/*CONSTCOND*/ 0) 2574 2575 static int 2576 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2577 { 2578 if (dst == NULL || src == NULL) { 2579 printf("ip6_clearpktopts: invalid argument\n"); 2580 return (EINVAL); 2581 } 2582 2583 dst->ip6po_hlim = src->ip6po_hlim; 2584 dst->ip6po_tclass = src->ip6po_tclass; 2585 dst->ip6po_flags = src->ip6po_flags; 2586 dst->ip6po_minmtu = src->ip6po_minmtu; 2587 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2588 if (src->ip6po_pktinfo) { 2589 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2590 M_IP6OPT, canwait); 2591 if (dst->ip6po_pktinfo == NULL) 2592 goto bad; 2593 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2594 } 2595 if (src->ip6po_nexthop) { 2596 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2597 M_IP6OPT, canwait); 2598 if (dst->ip6po_nexthop == NULL) 2599 goto bad; 2600 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2601 src->ip6po_nexthop->sa_len); 2602 } 2603 PKTOPT_EXTHDRCPY(ip6po_hbh); 2604 PKTOPT_EXTHDRCPY(ip6po_dest1); 2605 PKTOPT_EXTHDRCPY(ip6po_dest2); 2606 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2607 dst->ip6po_valid = src->ip6po_valid; 2608 return (0); 2609 2610 bad: 2611 ip6_clearpktopts(dst, -1); 2612 return (ENOBUFS); 2613 } 2614 #undef PKTOPT_EXTHDRCPY 2615 2616 struct ip6_pktopts * 2617 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2618 { 2619 int error; 2620 struct ip6_pktopts *dst; 2621 2622 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2623 if (dst == NULL) 2624 return (NULL); 2625 ip6_initpktopts(dst); 2626 2627 if ((error = copypktopts(dst, src, canwait)) != 0) { 2628 free(dst, M_IP6OPT); 2629 return (NULL); 2630 } 2631 2632 return (dst); 2633 } 2634 2635 void 2636 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2637 { 2638 if (pktopt == NULL) 2639 return; 2640 2641 ip6_clearpktopts(pktopt, -1); 2642 2643 free(pktopt, M_IP6OPT); 2644 } 2645 2646 /* 2647 * Set IPv6 outgoing packet options based on advanced API. 2648 */ 2649 int 2650 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2651 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2652 { 2653 struct cmsghdr *cm = NULL; 2654 2655 if (control == NULL || opt == NULL) 2656 return (EINVAL); 2657 2658 /* 2659 * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we 2660 * are in the network epoch here. 2661 */ 2662 NET_EPOCH_ASSERT(); 2663 2664 ip6_initpktopts(opt); 2665 if (stickyopt) { 2666 int error; 2667 2668 /* 2669 * If stickyopt is provided, make a local copy of the options 2670 * for this particular packet, then override them by ancillary 2671 * objects. 2672 * XXX: copypktopts() does not copy the cached route to a next 2673 * hop (if any). This is not very good in terms of efficiency, 2674 * but we can allow this since this option should be rarely 2675 * used. 2676 */ 2677 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2678 return (error); 2679 } 2680 2681 /* 2682 * XXX: Currently, we assume all the optional information is stored 2683 * in a single mbuf. 2684 */ 2685 if (control->m_next) 2686 return (EINVAL); 2687 2688 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2689 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2690 int error; 2691 2692 if (control->m_len < CMSG_LEN(0)) 2693 return (EINVAL); 2694 2695 cm = mtod(control, struct cmsghdr *); 2696 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2697 return (EINVAL); 2698 if (cm->cmsg_level != IPPROTO_IPV6) 2699 continue; 2700 2701 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2702 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2703 if (error) 2704 return (error); 2705 } 2706 2707 return (0); 2708 } 2709 2710 /* 2711 * Set a particular packet option, as a sticky option or an ancillary data 2712 * item. "len" can be 0 only when it's a sticky option. 2713 * We have 4 cases of combination of "sticky" and "cmsg": 2714 * "sticky=0, cmsg=0": impossible 2715 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2716 * "sticky=1, cmsg=0": RFC3542 socket option 2717 * "sticky=1, cmsg=1": RFC2292 socket option 2718 */ 2719 static int 2720 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2721 struct ucred *cred, int sticky, int cmsg, int uproto) 2722 { 2723 int minmtupolicy, preftemp; 2724 int error; 2725 2726 NET_EPOCH_ASSERT(); 2727 2728 if (!sticky && !cmsg) { 2729 #ifdef DIAGNOSTIC 2730 printf("ip6_setpktopt: impossible case\n"); 2731 #endif 2732 return (EINVAL); 2733 } 2734 2735 /* 2736 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2737 * not be specified in the context of RFC3542. Conversely, 2738 * RFC3542 types should not be specified in the context of RFC2292. 2739 */ 2740 if (!cmsg) { 2741 switch (optname) { 2742 case IPV6_2292PKTINFO: 2743 case IPV6_2292HOPLIMIT: 2744 case IPV6_2292NEXTHOP: 2745 case IPV6_2292HOPOPTS: 2746 case IPV6_2292DSTOPTS: 2747 case IPV6_2292RTHDR: 2748 case IPV6_2292PKTOPTIONS: 2749 return (ENOPROTOOPT); 2750 } 2751 } 2752 if (sticky && cmsg) { 2753 switch (optname) { 2754 case IPV6_PKTINFO: 2755 case IPV6_HOPLIMIT: 2756 case IPV6_NEXTHOP: 2757 case IPV6_HOPOPTS: 2758 case IPV6_DSTOPTS: 2759 case IPV6_RTHDRDSTOPTS: 2760 case IPV6_RTHDR: 2761 case IPV6_USE_MIN_MTU: 2762 case IPV6_DONTFRAG: 2763 case IPV6_TCLASS: 2764 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2765 return (ENOPROTOOPT); 2766 } 2767 } 2768 2769 switch (optname) { 2770 case IPV6_2292PKTINFO: 2771 case IPV6_PKTINFO: 2772 { 2773 struct ifnet *ifp = NULL; 2774 struct in6_pktinfo *pktinfo; 2775 2776 if (len != sizeof(struct in6_pktinfo)) 2777 return (EINVAL); 2778 2779 pktinfo = (struct in6_pktinfo *)buf; 2780 2781 /* 2782 * An application can clear any sticky IPV6_PKTINFO option by 2783 * doing a "regular" setsockopt with ipi6_addr being 2784 * in6addr_any and ipi6_ifindex being zero. 2785 * [RFC 3542, Section 6] 2786 */ 2787 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2788 pktinfo->ipi6_ifindex == 0 && 2789 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2790 ip6_clearpktopts(opt, optname); 2791 break; 2792 } 2793 2794 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2795 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2796 return (EINVAL); 2797 } 2798 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) 2799 return (EINVAL); 2800 /* validate the interface index if specified. */ 2801 if (pktinfo->ipi6_ifindex) { 2802 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2803 if (ifp == NULL) 2804 return (ENXIO); 2805 } 2806 if (ifp != NULL && (ifp->if_inet6 == NULL || 2807 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED) != 0)) 2808 return (ENETDOWN); 2809 2810 if (ifp != NULL && 2811 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2812 struct in6_ifaddr *ia; 2813 2814 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL); 2815 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr); 2816 if (ia == NULL) 2817 return (EADDRNOTAVAIL); 2818 ifa_free(&ia->ia_ifa); 2819 } 2820 /* 2821 * We store the address anyway, and let in6_selectsrc() 2822 * validate the specified address. This is because ipi6_addr 2823 * may not have enough information about its scope zone, and 2824 * we may need additional information (such as outgoing 2825 * interface or the scope zone of a destination address) to 2826 * disambiguate the scope. 2827 * XXX: the delay of the validation may confuse the 2828 * application when it is used as a sticky option. 2829 */ 2830 if (opt->ip6po_pktinfo == NULL) { 2831 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2832 M_IP6OPT, M_NOWAIT); 2833 if (opt->ip6po_pktinfo == NULL) 2834 return (ENOBUFS); 2835 } 2836 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2837 opt->ip6po_valid |= IP6PO_VALID_PKTINFO; 2838 break; 2839 } 2840 2841 case IPV6_2292HOPLIMIT: 2842 case IPV6_HOPLIMIT: 2843 { 2844 int *hlimp; 2845 2846 /* 2847 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2848 * to simplify the ordering among hoplimit options. 2849 */ 2850 if (optname == IPV6_HOPLIMIT && sticky) 2851 return (ENOPROTOOPT); 2852 2853 if (len != sizeof(int)) 2854 return (EINVAL); 2855 hlimp = (int *)buf; 2856 if (*hlimp < -1 || *hlimp > 255) 2857 return (EINVAL); 2858 2859 opt->ip6po_hlim = *hlimp; 2860 opt->ip6po_valid |= IP6PO_VALID_HLIM; 2861 break; 2862 } 2863 2864 case IPV6_TCLASS: 2865 { 2866 int tclass; 2867 2868 if (len != sizeof(int)) 2869 return (EINVAL); 2870 tclass = *(int *)buf; 2871 if (tclass < -1 || tclass > 255) 2872 return (EINVAL); 2873 2874 opt->ip6po_tclass = tclass; 2875 opt->ip6po_valid |= IP6PO_VALID_TC; 2876 break; 2877 } 2878 2879 case IPV6_2292NEXTHOP: 2880 case IPV6_NEXTHOP: 2881 if (cred != NULL) { 2882 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2883 if (error) 2884 return (error); 2885 } 2886 2887 if (len == 0) { /* just remove the option */ 2888 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2889 break; 2890 } 2891 2892 /* check if cmsg_len is large enough for sa_len */ 2893 if (len < sizeof(struct sockaddr) || len < *buf) 2894 return (EINVAL); 2895 2896 switch (((struct sockaddr *)buf)->sa_family) { 2897 case AF_INET6: 2898 { 2899 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2900 int error; 2901 2902 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2903 return (EINVAL); 2904 2905 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2906 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2907 return (EINVAL); 2908 } 2909 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2910 != 0) { 2911 return (error); 2912 } 2913 break; 2914 } 2915 case AF_LINK: /* should eventually be supported */ 2916 default: 2917 return (EAFNOSUPPORT); 2918 } 2919 2920 /* turn off the previous option, then set the new option. */ 2921 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2922 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2923 if (opt->ip6po_nexthop == NULL) 2924 return (ENOBUFS); 2925 bcopy(buf, opt->ip6po_nexthop, *buf); 2926 opt->ip6po_valid |= IP6PO_VALID_NHINFO; 2927 break; 2928 2929 case IPV6_2292HOPOPTS: 2930 case IPV6_HOPOPTS: 2931 { 2932 struct ip6_hbh *hbh; 2933 int hbhlen; 2934 2935 /* 2936 * XXX: We don't allow a non-privileged user to set ANY HbH 2937 * options, since per-option restriction has too much 2938 * overhead. 2939 */ 2940 if (cred != NULL) { 2941 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2942 if (error) 2943 return (error); 2944 } 2945 2946 if (len == 0) { 2947 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2948 break; /* just remove the option */ 2949 } 2950 2951 /* message length validation */ 2952 if (len < sizeof(struct ip6_hbh)) 2953 return (EINVAL); 2954 hbh = (struct ip6_hbh *)buf; 2955 hbhlen = (hbh->ip6h_len + 1) << 3; 2956 if (len != hbhlen) 2957 return (EINVAL); 2958 2959 /* turn off the previous option, then set the new option. */ 2960 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2961 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2962 if (opt->ip6po_hbh == NULL) 2963 return (ENOBUFS); 2964 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2965 opt->ip6po_valid |= IP6PO_VALID_HBH; 2966 2967 break; 2968 } 2969 2970 case IPV6_2292DSTOPTS: 2971 case IPV6_DSTOPTS: 2972 case IPV6_RTHDRDSTOPTS: 2973 { 2974 struct ip6_dest *dest, **newdest = NULL; 2975 int destlen; 2976 2977 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2978 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2979 if (error) 2980 return (error); 2981 } 2982 2983 if (len == 0) { 2984 ip6_clearpktopts(opt, optname); 2985 break; /* just remove the option */ 2986 } 2987 2988 /* message length validation */ 2989 if (len < sizeof(struct ip6_dest)) 2990 return (EINVAL); 2991 dest = (struct ip6_dest *)buf; 2992 destlen = (dest->ip6d_len + 1) << 3; 2993 if (len != destlen) 2994 return (EINVAL); 2995 2996 /* 2997 * Determine the position that the destination options header 2998 * should be inserted; before or after the routing header. 2999 */ 3000 switch (optname) { 3001 case IPV6_2292DSTOPTS: 3002 /* 3003 * The old advacned API is ambiguous on this point. 3004 * Our approach is to determine the position based 3005 * according to the existence of a routing header. 3006 * Note, however, that this depends on the order of the 3007 * extension headers in the ancillary data; the 1st 3008 * part of the destination options header must appear 3009 * before the routing header in the ancillary data, 3010 * too. 3011 * RFC3542 solved the ambiguity by introducing 3012 * separate ancillary data or option types. 3013 */ 3014 if (opt->ip6po_rthdr == NULL) 3015 newdest = &opt->ip6po_dest1; 3016 else 3017 newdest = &opt->ip6po_dest2; 3018 break; 3019 case IPV6_RTHDRDSTOPTS: 3020 newdest = &opt->ip6po_dest1; 3021 break; 3022 case IPV6_DSTOPTS: 3023 newdest = &opt->ip6po_dest2; 3024 break; 3025 } 3026 3027 /* turn off the previous option, then set the new option. */ 3028 ip6_clearpktopts(opt, optname); 3029 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3030 if (*newdest == NULL) 3031 return (ENOBUFS); 3032 bcopy(dest, *newdest, destlen); 3033 if (newdest == &opt->ip6po_dest1) 3034 opt->ip6po_valid |= IP6PO_VALID_DEST1; 3035 else 3036 opt->ip6po_valid |= IP6PO_VALID_DEST2; 3037 3038 break; 3039 } 3040 3041 case IPV6_2292RTHDR: 3042 case IPV6_RTHDR: 3043 { 3044 struct ip6_rthdr *rth; 3045 int rthlen; 3046 3047 if (len == 0) { 3048 ip6_clearpktopts(opt, IPV6_RTHDR); 3049 break; /* just remove the option */ 3050 } 3051 3052 /* message length validation */ 3053 if (len < sizeof(struct ip6_rthdr)) 3054 return (EINVAL); 3055 rth = (struct ip6_rthdr *)buf; 3056 rthlen = (rth->ip6r_len + 1) << 3; 3057 if (len != rthlen) 3058 return (EINVAL); 3059 3060 switch (rth->ip6r_type) { 3061 case IPV6_RTHDR_TYPE_0: 3062 if (rth->ip6r_len == 0) /* must contain one addr */ 3063 return (EINVAL); 3064 if (rth->ip6r_len % 2) /* length must be even */ 3065 return (EINVAL); 3066 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3067 return (EINVAL); 3068 break; 3069 default: 3070 return (EINVAL); /* not supported */ 3071 } 3072 3073 /* turn off the previous option */ 3074 ip6_clearpktopts(opt, IPV6_RTHDR); 3075 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3076 if (opt->ip6po_rthdr == NULL) 3077 return (ENOBUFS); 3078 bcopy(rth, opt->ip6po_rthdr, rthlen); 3079 opt->ip6po_valid |= IP6PO_VALID_RHINFO; 3080 3081 break; 3082 } 3083 3084 case IPV6_USE_MIN_MTU: 3085 if (len != sizeof(int)) 3086 return (EINVAL); 3087 minmtupolicy = *(int *)buf; 3088 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3089 minmtupolicy != IP6PO_MINMTU_DISABLE && 3090 minmtupolicy != IP6PO_MINMTU_ALL) { 3091 return (EINVAL); 3092 } 3093 opt->ip6po_minmtu = minmtupolicy; 3094 break; 3095 3096 case IPV6_DONTFRAG: 3097 if (len != sizeof(int)) 3098 return (EINVAL); 3099 3100 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3101 /* 3102 * we ignore this option for TCP sockets. 3103 * (RFC3542 leaves this case unspecified.) 3104 */ 3105 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3106 } else 3107 opt->ip6po_flags |= IP6PO_DONTFRAG; 3108 break; 3109 3110 case IPV6_PREFER_TEMPADDR: 3111 if (len != sizeof(int)) 3112 return (EINVAL); 3113 preftemp = *(int *)buf; 3114 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3115 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3116 preftemp != IP6PO_TEMPADDR_PREFER) { 3117 return (EINVAL); 3118 } 3119 opt->ip6po_prefer_tempaddr = preftemp; 3120 break; 3121 3122 default: 3123 return (ENOPROTOOPT); 3124 } /* end of switch */ 3125 3126 return (0); 3127 } 3128 3129 /* 3130 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3131 * packet to the input queue of a specified interface. Note that this 3132 * calls the output routine of the loopback "driver", but with an interface 3133 * pointer that might NOT be &loif -- easier than replicating that code here. 3134 */ 3135 void 3136 ip6_mloopback(struct ifnet *ifp, struct mbuf *m) 3137 { 3138 struct mbuf *copym; 3139 struct ip6_hdr *ip6; 3140 3141 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT); 3142 if (copym == NULL) 3143 return; 3144 3145 /* 3146 * Make sure to deep-copy IPv6 header portion in case the data 3147 * is in an mbuf cluster, so that we can safely override the IPv6 3148 * header portion later. 3149 */ 3150 if (!M_WRITABLE(copym) || 3151 copym->m_len < sizeof(struct ip6_hdr)) { 3152 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3153 if (copym == NULL) 3154 return; 3155 } 3156 ip6 = mtod(copym, struct ip6_hdr *); 3157 /* 3158 * clear embedded scope identifiers if necessary. 3159 * in6_clearscope will touch the addresses only when necessary. 3160 */ 3161 in6_clearscope(&ip6->ip6_src); 3162 in6_clearscope(&ip6->ip6_dst); 3163 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3164 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3165 CSUM_PSEUDO_HDR; 3166 copym->m_pkthdr.csum_data = 0xffff; 3167 } 3168 if_simloop(ifp, copym, AF_INET6, 0); 3169 } 3170 3171 /* 3172 * Chop IPv6 header off from the payload. 3173 */ 3174 static int 3175 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3176 { 3177 struct mbuf *mh; 3178 struct ip6_hdr *ip6; 3179 3180 ip6 = mtod(m, struct ip6_hdr *); 3181 if (m->m_len > sizeof(*ip6)) { 3182 mh = m_gethdr(M_NOWAIT, MT_DATA); 3183 if (mh == NULL) { 3184 m_freem(m); 3185 return ENOBUFS; 3186 } 3187 m_move_pkthdr(mh, m); 3188 M_ALIGN(mh, sizeof(*ip6)); 3189 m->m_len -= sizeof(*ip6); 3190 m->m_data += sizeof(*ip6); 3191 mh->m_next = m; 3192 m = mh; 3193 m->m_len = sizeof(*ip6); 3194 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3195 } 3196 exthdrs->ip6e_ip6 = m; 3197 return 0; 3198 } 3199 3200 /* 3201 * Compute IPv6 extension header length. 3202 */ 3203 int 3204 ip6_optlen(struct inpcb *inp) 3205 { 3206 int len; 3207 3208 if (!inp->in6p_outputopts) 3209 return 0; 3210 3211 len = 0; 3212 #define elen(x) \ 3213 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3214 3215 len += elen(inp->in6p_outputopts->ip6po_hbh); 3216 if (inp->in6p_outputopts->ip6po_rthdr) 3217 /* dest1 is valid with rthdr only */ 3218 len += elen(inp->in6p_outputopts->ip6po_dest1); 3219 len += elen(inp->in6p_outputopts->ip6po_rthdr); 3220 len += elen(inp->in6p_outputopts->ip6po_dest2); 3221 return len; 3222 #undef elen 3223 } 3224