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_route.h" 69 #include "opt_rss.h" 70 #include "opt_sctp.h" 71 72 #include <sys/param.h> 73 #include <sys/kernel.h> 74 #include <sys/ktls.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_private.h> 91 #include <net/if_vlan_var.h> 92 #include <net/if_llatbl.h> 93 #include <net/ethernet.h> 94 #include <net/netisr.h> 95 #include <net/route.h> 96 #include <net/route/nhop.h> 97 #include <net/pfil.h> 98 #include <net/rss_config.h> 99 #include <net/vnet.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_var.h> 103 #include <netinet/ip_var.h> 104 #include <netinet6/in6_fib.h> 105 #include <netinet6/in6_var.h> 106 #include <netinet/ip6.h> 107 #include <netinet/icmp6.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet/in_pcb.h> 110 #include <netinet/tcp_var.h> 111 #include <netinet6/nd6.h> 112 #include <netinet6/in6_rss.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_mrouter && (flags & IPV6_FORWARDING) == 0) { 893 /* 894 * XXX: ip6_mforward expects that rcvif is NULL 895 * when it is called from the originating path. 896 * However, it may not always be the case. 897 */ 898 m->m_pkthdr.rcvif = NULL; 899 if (ip6_mforward(ip6, ifp, m) != 0) { 900 m_freem(m); 901 goto done; 902 } 903 } 904 } 905 /* 906 * Multicasts with a hoplimit of zero may be looped back, 907 * above, but must not be transmitted on a network. 908 * Also, multicasts addressed to the loopback interface 909 * are not sent -- the above call to ip6_mloopback() will 910 * loop back a copy if this host actually belongs to the 911 * destination group on the loopback interface. 912 */ 913 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 914 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 915 m_freem(m); 916 goto done; 917 } 918 } 919 920 /* 921 * Fill the outgoing inteface to tell the upper layer 922 * to increment per-interface statistics. 923 */ 924 if (ifpp) 925 *ifpp = ifp; 926 927 /* Determine path MTU. */ 928 ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, &mtu, fibnum, 929 *nexthdrp); 930 KASSERT(mtu > 0, ("%s:%d: mtu %ld, ro_pmtu %p ro %p ifp %p fibnum %u", 931 __func__, __LINE__, mtu, ro_pmtu, ro, ifp, fibnum)); 932 933 /* 934 * The caller of this function may specify to use the minimum MTU 935 * in some cases. 936 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 937 * setting. The logic is a bit complicated; by default, unicast 938 * packets will follow path MTU while multicast packets will be sent at 939 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 940 * including unicast ones will be sent at the minimum MTU. Multicast 941 * packets will always be sent at the minimum MTU unless 942 * IP6PO_MINMTU_DISABLE is explicitly specified. 943 * See RFC 3542 for more details. 944 */ 945 if (mtu > IPV6_MMTU) { 946 if ((flags & IPV6_MINMTU)) 947 mtu = IPV6_MMTU; 948 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 949 mtu = IPV6_MMTU; 950 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 951 (opt == NULL || 952 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 953 mtu = IPV6_MMTU; 954 } 955 } 956 957 /* 958 * Clear embedded scope identifiers if necessary. 959 * in6_clearscope() will touch the addresses only when necessary. 960 */ 961 in6_clearscope(&ip6->ip6_src); 962 in6_clearscope(&ip6->ip6_dst); 963 964 /* 965 * If the outgoing packet contains a hop-by-hop options header, 966 * it must be examined and processed even by the source node. 967 * (RFC 2460, section 4.) 968 */ 969 if (exthdrs.ip6e_hbh) { 970 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 971 u_int32_t dummy; /* XXX unused */ 972 973 #ifdef DIAGNOSTIC 974 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 975 panic("ip6e_hbh is not contiguous"); 976 #endif 977 /* 978 * XXX: if we have to send an ICMPv6 error to the sender, 979 * we need the M_LOOP flag since icmp6_error() expects 980 * the IPv6 and the hop-by-hop options header are 981 * contiguous unless the flag is set. 982 */ 983 m->m_flags |= M_LOOP; 984 m->m_pkthdr.rcvif = ifp; 985 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 986 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 987 &dummy) < 0) { 988 /* m was already freed at this point. */ 989 error = EINVAL;/* better error? */ 990 goto done; 991 } 992 m->m_flags &= ~M_LOOP; /* XXX */ 993 m->m_pkthdr.rcvif = NULL; 994 } 995 996 /* Jump over all PFIL processing if hooks are not active. */ 997 if (!PFIL_HOOKED_OUT(V_inet6_pfil_head)) 998 goto passout; 999 1000 odst = ip6->ip6_dst; 1001 /* Run through list of hooks for output packets. */ 1002 switch (pfil_mbuf_out(V_inet6_pfil_head, &m, ifp, inp)) { 1003 case PFIL_PASS: 1004 ip6 = mtod(m, struct ip6_hdr *); 1005 break; 1006 case PFIL_DROPPED: 1007 error = EACCES; 1008 /* FALLTHROUGH */ 1009 case PFIL_CONSUMED: 1010 goto done; 1011 } 1012 1013 needfiblookup = 0; 1014 /* See if destination IP address was changed by packet filter. */ 1015 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 1016 m->m_flags |= M_SKIP_FIREWALL; 1017 /* If destination is now ourself drop to ip6_input(). */ 1018 if (in6_localip(&ip6->ip6_dst)) { 1019 m->m_flags |= M_FASTFWD_OURS; 1020 if (m->m_pkthdr.rcvif == NULL) 1021 m->m_pkthdr.rcvif = V_loif; 1022 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1023 m->m_pkthdr.csum_flags |= 1024 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 1025 m->m_pkthdr.csum_data = 0xffff; 1026 } 1027 #if defined(SCTP) || defined(SCTP_SUPPORT) 1028 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 1029 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1030 #endif 1031 error = netisr_queue(NETISR_IPV6, m); 1032 goto done; 1033 } else { 1034 if (ro != NULL) 1035 RO_INVALIDATE_CACHE(ro); 1036 needfiblookup = 1; /* Redo the routing table lookup. */ 1037 } 1038 } 1039 /* See if fib was changed by packet filter. */ 1040 if (fibnum != M_GETFIB(m)) { 1041 m->m_flags |= M_SKIP_FIREWALL; 1042 fibnum = M_GETFIB(m); 1043 if (ro != NULL) 1044 RO_INVALIDATE_CACHE(ro); 1045 needfiblookup = 1; 1046 } 1047 if (needfiblookup) 1048 goto again; 1049 1050 /* See if local, if yes, send it to netisr. */ 1051 if (m->m_flags & M_FASTFWD_OURS) { 1052 if (m->m_pkthdr.rcvif == NULL) 1053 m->m_pkthdr.rcvif = V_loif; 1054 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 1055 m->m_pkthdr.csum_flags |= 1056 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 1057 m->m_pkthdr.csum_data = 0xffff; 1058 } 1059 #if defined(SCTP) || defined(SCTP_SUPPORT) 1060 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 1061 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 1062 #endif 1063 error = netisr_queue(NETISR_IPV6, m); 1064 goto done; 1065 } 1066 /* Or forward to some other address? */ 1067 if ((m->m_flags & M_IP6_NEXTHOP) && 1068 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 1069 if (ro != NULL) 1070 dst = (struct sockaddr_in6 *)&ro->ro_dst; 1071 else 1072 dst = &sin6; 1073 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 1074 m->m_flags |= M_SKIP_FIREWALL; 1075 m->m_flags &= ~M_IP6_NEXTHOP; 1076 m_tag_delete(m, fwd_tag); 1077 goto again; 1078 } 1079 1080 passout: 1081 if (vlan_pcp > -1) 1082 EVL_APPLY_PRI(m, vlan_pcp); 1083 1084 /* Ensure the packet data is mapped if the interface requires it. */ 1085 if ((ifp->if_capenable & IFCAP_MEXTPG) == 0) { 1086 struct mbuf *m1; 1087 1088 error = mb_unmapped_to_ext(m, &m1); 1089 if (error != 0) { 1090 if (error == EINVAL) { 1091 if_printf(ifp, "TLS packet\n"); 1092 /* XXXKIB */ 1093 } else if (error == ENOMEM) { 1094 error = ENOBUFS; 1095 } 1096 IP6STAT_INC(ip6s_odropped); 1097 return (error); 1098 } else { 1099 m = m1; 1100 } 1101 } 1102 1103 /* 1104 * Send the packet to the outgoing interface. 1105 * If necessary, do IPv6 fragmentation before sending. 1106 * 1107 * 1: normal case (dontfrag == 0) 1108 * 1-a: send as is if tlen <= path mtu 1109 * 1-b: fragment if tlen > path mtu 1110 * 1111 * 2: if user asks us not to fragment (dontfrag == 1) 1112 * 2-a: send as is if tlen <= interface mtu 1113 * 2-b: error if tlen > interface mtu 1114 */ 1115 sw_csum = m->m_pkthdr.csum_flags; 1116 if (!hdrsplit) { 1117 tso = ((sw_csum & ifp->if_hwassist & 1118 (CSUM_TSO | CSUM_INNER_TSO)) != 0) ? 1 : 0; 1119 sw_csum &= ~ifp->if_hwassist; 1120 } else 1121 tso = 0; 1122 /* 1123 * If we added extension headers, we will not do TSO and calculate the 1124 * checksums ourselves for now. 1125 * XXX-BZ Need a framework to know when the NIC can handle it, even 1126 * with ext. hdrs. 1127 */ 1128 ip6_output_delayed_csum(m, ifp, sw_csum, plen, optlen); 1129 /* XXX-BZ m->m_pkthdr.csum_flags &= ~ifp->if_hwassist; */ 1130 tlen = m->m_pkthdr.len; 1131 1132 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 1133 dontfrag = 1; 1134 else 1135 dontfrag = 0; 1136 if (dontfrag && tlen > in6_ifmtu(ifp) && !tso) { /* Case 2-b. */ 1137 /* 1138 * If the DONTFRAG option is specified, we cannot send the 1139 * packet when the data length is larger than the MTU of the 1140 * outgoing interface. 1141 * Notify the error by sending IPV6_PATHMTU ancillary data if 1142 * application wanted to know the MTU value. Also return an 1143 * error code (this is not described in the API spec). 1144 */ 1145 if (inp != NULL) 1146 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 1147 error = EMSGSIZE; 1148 goto bad; 1149 } 1150 1151 /* Transmit packet without fragmentation. */ 1152 if (dontfrag || tlen <= mtu) { /* Cases 1-a and 2-a. */ 1153 struct in6_ifaddr *ia6; 1154 1155 ip6 = mtod(m, struct ip6_hdr *); 1156 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1157 if (ia6) { 1158 /* Record statistics for this interface address. */ 1159 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1); 1160 counter_u64_add(ia6->ia_ifa.ifa_obytes, 1161 m->m_pkthdr.len); 1162 } 1163 error = ip6_output_send(inp, ifp, origifp, m, dst, ro, 1164 (flags & IP_NO_SND_TAG_RL) ? false : true); 1165 goto done; 1166 } 1167 1168 /* Try to fragment the packet. Case 1-b. */ 1169 if (mtu < IPV6_MMTU) { 1170 /* Path MTU cannot be less than IPV6_MMTU. */ 1171 error = EMSGSIZE; 1172 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1173 goto bad; 1174 } else if (ip6->ip6_plen == 0) { 1175 /* We do not support jumbo payload. */ 1176 error = EMSGSIZE; 1177 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1178 goto bad; 1179 } else { 1180 u_char nextproto; 1181 1182 /* 1183 * Too large for the destination or interface; 1184 * fragment if possible. 1185 * Must be able to put at least 8 bytes per fragment. 1186 */ 1187 if (mtu > IPV6_MAXPACKET) 1188 mtu = IPV6_MAXPACKET; 1189 1190 len = (mtu - unfragpartlen - sizeof(struct ip6_frag)) & ~7; 1191 if (len < 8) { 1192 error = EMSGSIZE; 1193 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1194 goto bad; 1195 } 1196 1197 /* 1198 * If the interface will not calculate checksums on 1199 * fragmented packets, then do it here. 1200 * XXX-BZ handle the hw offloading case. Need flags. 1201 */ 1202 ip6_output_delayed_csum(m, ifp, m->m_pkthdr.csum_flags, plen, 1203 optlen); 1204 1205 /* 1206 * Change the next header field of the last header in the 1207 * unfragmentable part. 1208 */ 1209 if (exthdrs.ip6e_rthdr) { 1210 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1211 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1212 } else if (exthdrs.ip6e_dest1) { 1213 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1214 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1215 } else if (exthdrs.ip6e_hbh) { 1216 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1217 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1218 } else { 1219 ip6 = mtod(m, struct ip6_hdr *); 1220 nextproto = ip6->ip6_nxt; 1221 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1222 } 1223 1224 /* 1225 * Loop through length of segment after first fragment, 1226 * make new header and copy data of each part and link onto 1227 * chain. 1228 */ 1229 m0 = m; 1230 id = htonl(ip6_randomid()); 1231 error = ip6_fragment(ifp, m, unfragpartlen, nextproto,len, id); 1232 if (error != 0) 1233 goto sendorfree; 1234 1235 in6_ifstat_inc(ifp, ifs6_out_fragok); 1236 } 1237 1238 /* Remove leading garbage. */ 1239 sendorfree: 1240 m = m0->m_nextpkt; 1241 m0->m_nextpkt = 0; 1242 m_freem(m0); 1243 for (; m; m = m0) { 1244 m0 = m->m_nextpkt; 1245 m->m_nextpkt = 0; 1246 if (error == 0) { 1247 /* Record statistics for this interface address. */ 1248 if (ia) { 1249 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 1250 counter_u64_add(ia->ia_ifa.ifa_obytes, 1251 m->m_pkthdr.len); 1252 } 1253 if (vlan_pcp > -1) 1254 EVL_APPLY_PRI(m, vlan_pcp); 1255 error = ip6_output_send(inp, ifp, origifp, m, dst, ro, 1256 true); 1257 } else 1258 m_freem(m); 1259 } 1260 1261 if (error == 0) 1262 IP6STAT_INC(ip6s_fragmented); 1263 1264 done: 1265 return (error); 1266 1267 freehdrs: 1268 m_freem(exthdrs.ip6e_hbh); /* m_freem() checks if mbuf is NULL. */ 1269 m_freem(exthdrs.ip6e_dest1); 1270 m_freem(exthdrs.ip6e_rthdr); 1271 m_freem(exthdrs.ip6e_dest2); 1272 /* FALLTHROUGH */ 1273 bad: 1274 if (m) 1275 m_freem(m); 1276 goto done; 1277 } 1278 1279 static int 1280 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1281 { 1282 struct mbuf *m; 1283 1284 if (hlen > MCLBYTES) 1285 return (ENOBUFS); /* XXX */ 1286 1287 if (hlen > MLEN) 1288 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1289 else 1290 m = m_get(M_NOWAIT, MT_DATA); 1291 if (m == NULL) 1292 return (ENOBUFS); 1293 m->m_len = hlen; 1294 if (hdr) 1295 bcopy(hdr, mtod(m, caddr_t), hlen); 1296 1297 *mp = m; 1298 return (0); 1299 } 1300 1301 /* 1302 * Insert fragment header and copy unfragmentable header portions. 1303 */ 1304 static int 1305 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1306 struct ip6_frag **frghdrp) 1307 { 1308 struct mbuf *n, *mlast; 1309 1310 if (hlen > sizeof(struct ip6_hdr)) { 1311 n = m_copym(m0, sizeof(struct ip6_hdr), 1312 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1313 if (n == NULL) 1314 return (ENOBUFS); 1315 m->m_next = n; 1316 } else 1317 n = m; 1318 1319 /* Search for the last mbuf of unfragmentable part. */ 1320 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1321 ; 1322 1323 if (M_WRITABLE(mlast) && 1324 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1325 /* use the trailing space of the last mbuf for the fragment hdr */ 1326 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1327 mlast->m_len); 1328 mlast->m_len += sizeof(struct ip6_frag); 1329 m->m_pkthdr.len += sizeof(struct ip6_frag); 1330 } else { 1331 /* allocate a new mbuf for the fragment header */ 1332 struct mbuf *mfrg; 1333 1334 mfrg = m_get(M_NOWAIT, MT_DATA); 1335 if (mfrg == NULL) 1336 return (ENOBUFS); 1337 mfrg->m_len = sizeof(struct ip6_frag); 1338 *frghdrp = mtod(mfrg, struct ip6_frag *); 1339 mlast->m_next = mfrg; 1340 } 1341 1342 return (0); 1343 } 1344 1345 /* 1346 * Calculates IPv6 path mtu for destination @dst. 1347 * Resulting MTU is stored in @mtup. 1348 * 1349 * Returns 0 on success. 1350 */ 1351 static int 1352 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup) 1353 { 1354 struct epoch_tracker et; 1355 struct nhop_object *nh; 1356 struct in6_addr kdst; 1357 uint32_t scopeid; 1358 int error; 1359 1360 in6_splitscope(dst, &kdst, &scopeid); 1361 1362 NET_EPOCH_ENTER(et); 1363 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0); 1364 if (nh != NULL) { 1365 ip6_calcmtu(nh->nh_ifp, dst, nh->nh_mtu, mtup, 0); 1366 error = 0; 1367 } else 1368 error = EHOSTUNREACH; 1369 NET_EPOCH_EXIT(et); 1370 1371 return (error); 1372 } 1373 1374 /* 1375 * Calculates IPv6 path MTU for @dst based on transmit @ifp, 1376 * and cached data in @ro_pmtu. 1377 * MTU from (successful) route lookup is saved (along with dst) 1378 * inside @ro_pmtu to avoid subsequent route lookups after packet 1379 * filter processing. 1380 * 1381 * Stores mtu into @mtup. 1382 */ 1383 static void 1384 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup, 1385 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup, 1386 u_int fibnum, u_int proto) 1387 { 1388 struct nhop_object *nh; 1389 struct in6_addr kdst; 1390 uint32_t scopeid; 1391 struct sockaddr_in6 *sa6_dst, sin6; 1392 u_long mtu; 1393 1394 NET_EPOCH_ASSERT(); 1395 1396 mtu = 0; 1397 if (ro_pmtu == NULL || do_lookup) { 1398 /* 1399 * Here ro_pmtu has final destination address, while 1400 * ro might represent immediate destination. 1401 * Use ro_pmtu destination since mtu might differ. 1402 */ 1403 if (ro_pmtu != NULL) { 1404 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1405 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst)) 1406 ro_pmtu->ro_mtu = 0; 1407 } else 1408 sa6_dst = &sin6; 1409 1410 if (ro_pmtu == NULL || ro_pmtu->ro_mtu == 0) { 1411 bzero(sa6_dst, sizeof(*sa6_dst)); 1412 sa6_dst->sin6_family = AF_INET6; 1413 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1414 sa6_dst->sin6_addr = *dst; 1415 1416 in6_splitscope(dst, &kdst, &scopeid); 1417 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0); 1418 if (nh != NULL) { 1419 mtu = nh->nh_mtu; 1420 if (ro_pmtu != NULL) 1421 ro_pmtu->ro_mtu = mtu; 1422 } 1423 } else 1424 mtu = ro_pmtu->ro_mtu; 1425 } 1426 1427 if (ro_pmtu != NULL && ro_pmtu->ro_nh != NULL) 1428 mtu = ro_pmtu->ro_nh->nh_mtu; 1429 1430 ip6_calcmtu(ifp, dst, mtu, mtup, proto); 1431 } 1432 1433 /* 1434 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and 1435 * hostcache data for @dst. 1436 * Stores mtu into @mtup. 1437 */ 1438 static void 1439 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu, 1440 u_long *mtup, u_int proto) 1441 { 1442 u_long mtu = 0; 1443 1444 if (rt_mtu > 0) { 1445 /* Skip the hostcache if the protocol handles PMTU changes. */ 1446 if (proto != IPPROTO_TCP && proto != IPPROTO_SCTP) { 1447 struct in_conninfo inc = { 1448 .inc_flags = INC_ISIPV6, 1449 .inc6_faddr = *dst, 1450 }; 1451 1452 mtu = tcp_hc_getmtu(&inc); 1453 } 1454 1455 if (mtu) 1456 mtu = min(mtu, rt_mtu); 1457 else 1458 mtu = rt_mtu; 1459 } 1460 1461 if (mtu == 0) 1462 mtu = in6_ifmtu(ifp); 1463 1464 *mtup = mtu; 1465 } 1466 1467 /* 1468 * IP6 socket option processing. 1469 */ 1470 int 1471 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1472 { 1473 int optdatalen, uproto; 1474 void *optdata; 1475 struct inpcb *inp = sotoinpcb(so); 1476 int error, optval; 1477 int level, op, optname; 1478 int optlen; 1479 struct thread *td; 1480 #ifdef RSS 1481 uint32_t rss_bucket; 1482 int retval; 1483 #endif 1484 1485 /* 1486 * Don't use more than a quarter of mbuf clusters. N.B.: 1487 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow 1488 * on LP64 architectures, so cast to u_long to avoid undefined 1489 * behavior. ILP32 architectures cannot have nmbclusters 1490 * large enough to overflow for other reasons. 1491 */ 1492 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4) 1493 1494 level = sopt->sopt_level; 1495 op = sopt->sopt_dir; 1496 optname = sopt->sopt_name; 1497 optlen = sopt->sopt_valsize; 1498 td = sopt->sopt_td; 1499 error = 0; 1500 optval = 0; 1501 uproto = (int)so->so_proto->pr_protocol; 1502 1503 if (level != IPPROTO_IPV6) { 1504 error = EINVAL; 1505 1506 if (sopt->sopt_level == SOL_SOCKET && 1507 sopt->sopt_dir == SOPT_SET) { 1508 switch (sopt->sopt_name) { 1509 case SO_SETFIB: 1510 error = sooptcopyin(sopt, &optval, 1511 sizeof(optval), sizeof(optval)); 1512 if (error != 0) 1513 break; 1514 1515 INP_WLOCK(inp); 1516 if ((inp->inp_flags & INP_BOUNDFIB) != 0 && 1517 optval != so->so_fibnum) { 1518 INP_WUNLOCK(inp); 1519 error = EISCONN; 1520 break; 1521 } 1522 error = sosetfib(inp->inp_socket, optval); 1523 if (error == 0) 1524 inp->inp_inc.inc_fibnum = optval; 1525 INP_WUNLOCK(inp); 1526 break; 1527 case SO_MAX_PACING_RATE: 1528 #ifdef RATELIMIT 1529 INP_WLOCK(inp); 1530 inp->inp_flags2 |= INP_RATE_LIMIT_CHANGED; 1531 INP_WUNLOCK(inp); 1532 error = 0; 1533 #else 1534 error = EOPNOTSUPP; 1535 #endif 1536 break; 1537 default: 1538 break; 1539 } 1540 } 1541 } else { /* level == IPPROTO_IPV6 */ 1542 switch (op) { 1543 case SOPT_SET: 1544 switch (optname) { 1545 case IPV6_2292PKTOPTIONS: 1546 #ifdef IPV6_PKTOPTIONS 1547 case IPV6_PKTOPTIONS: 1548 #endif 1549 { 1550 struct mbuf *m; 1551 1552 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) { 1553 printf("ip6_ctloutput: mbuf limit hit\n"); 1554 error = ENOBUFS; 1555 break; 1556 } 1557 1558 error = soopt_getm(sopt, &m); /* XXX */ 1559 if (error != 0) 1560 break; 1561 error = soopt_mcopyin(sopt, m); /* XXX */ 1562 if (error != 0) 1563 break; 1564 INP_WLOCK(inp); 1565 error = ip6_pcbopts(&inp->in6p_outputopts, m, 1566 so, sopt); 1567 INP_WUNLOCK(inp); 1568 m_freem(m); /* XXX */ 1569 break; 1570 } 1571 1572 /* 1573 * Use of some Hop-by-Hop options or some 1574 * Destination options, might require special 1575 * privilege. That is, normal applications 1576 * (without special privilege) might be forbidden 1577 * from setting certain options in outgoing packets, 1578 * and might never see certain options in received 1579 * packets. [RFC 2292 Section 6] 1580 * KAME specific note: 1581 * KAME prevents non-privileged users from sending or 1582 * receiving ANY hbh/dst options in order to avoid 1583 * overhead of parsing options in the kernel. 1584 */ 1585 case IPV6_RECVHOPOPTS: 1586 case IPV6_RECVDSTOPTS: 1587 case IPV6_RECVRTHDRDSTOPTS: 1588 if (td != NULL) { 1589 error = priv_check(td, 1590 PRIV_NETINET_SETHDROPTS); 1591 if (error) 1592 break; 1593 } 1594 /* FALLTHROUGH */ 1595 case IPV6_UNICAST_HOPS: 1596 case IPV6_HOPLIMIT: 1597 1598 case IPV6_RECVPKTINFO: 1599 case IPV6_RECVHOPLIMIT: 1600 case IPV6_RECVRTHDR: 1601 case IPV6_RECVPATHMTU: 1602 case IPV6_RECVTCLASS: 1603 case IPV6_RECVFLOWID: 1604 #ifdef RSS 1605 case IPV6_RECVRSSBUCKETID: 1606 #endif 1607 case IPV6_V6ONLY: 1608 case IPV6_AUTOFLOWLABEL: 1609 case IPV6_ORIGDSTADDR: 1610 case IPV6_BINDANY: 1611 case IPV6_VLAN_PCP: 1612 if (optname == IPV6_BINDANY && td != NULL) { 1613 error = priv_check(td, 1614 PRIV_NETINET_BINDANY); 1615 if (error) 1616 break; 1617 } 1618 1619 if (optlen != sizeof(int)) { 1620 error = EINVAL; 1621 break; 1622 } 1623 error = sooptcopyin(sopt, &optval, 1624 sizeof optval, sizeof optval); 1625 if (error) 1626 break; 1627 switch (optname) { 1628 case IPV6_UNICAST_HOPS: 1629 if (optval < -1 || optval >= 256) 1630 error = EINVAL; 1631 else { 1632 /* -1 = kernel default */ 1633 inp->in6p_hops = optval; 1634 if ((inp->inp_vflag & 1635 INP_IPV4) != 0) 1636 inp->inp_ip_ttl = optval; 1637 } 1638 break; 1639 #define OPTSET(bit) \ 1640 do { \ 1641 INP_WLOCK(inp); \ 1642 if (optval) \ 1643 inp->inp_flags |= (bit); \ 1644 else \ 1645 inp->inp_flags &= ~(bit); \ 1646 INP_WUNLOCK(inp); \ 1647 } while (/*CONSTCOND*/ 0) 1648 #define OPTSET2292(bit) \ 1649 do { \ 1650 INP_WLOCK(inp); \ 1651 inp->inp_flags |= IN6P_RFC2292; \ 1652 if (optval) \ 1653 inp->inp_flags |= (bit); \ 1654 else \ 1655 inp->inp_flags &= ~(bit); \ 1656 INP_WUNLOCK(inp); \ 1657 } while (/*CONSTCOND*/ 0) 1658 #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0) 1659 1660 #define OPTSET2_N(bit, val) do { \ 1661 if (val) \ 1662 inp->inp_flags2 |= bit; \ 1663 else \ 1664 inp->inp_flags2 &= ~bit; \ 1665 } while (0) 1666 #define OPTSET2(bit, val) do { \ 1667 INP_WLOCK(inp); \ 1668 OPTSET2_N(bit, val); \ 1669 INP_WUNLOCK(inp); \ 1670 } while (0) 1671 #define OPTBIT2(bit) (inp->inp_flags2 & (bit) ? 1 : 0) 1672 #define OPTSET2292_EXCLUSIVE(bit) \ 1673 do { \ 1674 INP_WLOCK(inp); \ 1675 if (OPTBIT(IN6P_RFC2292)) { \ 1676 error = EINVAL; \ 1677 } else { \ 1678 if (optval) \ 1679 inp->inp_flags |= (bit); \ 1680 else \ 1681 inp->inp_flags &= ~(bit); \ 1682 } \ 1683 INP_WUNLOCK(inp); \ 1684 } while (/*CONSTCOND*/ 0) 1685 1686 case IPV6_RECVPKTINFO: 1687 OPTSET2292_EXCLUSIVE(IN6P_PKTINFO); 1688 break; 1689 1690 case IPV6_HOPLIMIT: 1691 { 1692 struct ip6_pktopts **optp; 1693 1694 /* cannot mix with RFC2292 */ 1695 if (OPTBIT(IN6P_RFC2292)) { 1696 error = EINVAL; 1697 break; 1698 } 1699 INP_WLOCK(inp); 1700 if (inp->inp_flags & INP_DROPPED) { 1701 INP_WUNLOCK(inp); 1702 return (ECONNRESET); 1703 } 1704 optp = &inp->in6p_outputopts; 1705 error = ip6_pcbopt(IPV6_HOPLIMIT, 1706 (u_char *)&optval, sizeof(optval), 1707 optp, (td != NULL) ? td->td_ucred : 1708 NULL, uproto); 1709 INP_WUNLOCK(inp); 1710 break; 1711 } 1712 1713 case IPV6_RECVHOPLIMIT: 1714 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT); 1715 break; 1716 1717 case IPV6_RECVHOPOPTS: 1718 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS); 1719 break; 1720 1721 case IPV6_RECVDSTOPTS: 1722 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS); 1723 break; 1724 1725 case IPV6_RECVRTHDRDSTOPTS: 1726 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS); 1727 break; 1728 1729 case IPV6_RECVRTHDR: 1730 OPTSET2292_EXCLUSIVE(IN6P_RTHDR); 1731 break; 1732 1733 case IPV6_RECVPATHMTU: 1734 /* 1735 * We ignore this option for TCP 1736 * sockets. 1737 * (RFC3542 leaves this case 1738 * unspecified.) 1739 */ 1740 if (uproto != IPPROTO_TCP) 1741 OPTSET(IN6P_MTU); 1742 break; 1743 1744 case IPV6_RECVFLOWID: 1745 OPTSET2(INP_RECVFLOWID, optval); 1746 break; 1747 1748 #ifdef RSS 1749 case IPV6_RECVRSSBUCKETID: 1750 OPTSET2(INP_RECVRSSBUCKETID, optval); 1751 break; 1752 #endif 1753 1754 case IPV6_V6ONLY: 1755 INP_WLOCK(inp); 1756 if (inp->inp_lport || 1757 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 1758 /* 1759 * The socket is already bound. 1760 */ 1761 INP_WUNLOCK(inp); 1762 error = EINVAL; 1763 break; 1764 } 1765 if (optval) { 1766 inp->inp_flags |= IN6P_IPV6_V6ONLY; 1767 inp->inp_vflag &= ~INP_IPV4; 1768 } else { 1769 inp->inp_flags &= ~IN6P_IPV6_V6ONLY; 1770 inp->inp_vflag |= INP_IPV4; 1771 } 1772 INP_WUNLOCK(inp); 1773 break; 1774 case IPV6_RECVTCLASS: 1775 /* cannot mix with RFC2292 XXX */ 1776 OPTSET2292_EXCLUSIVE(IN6P_TCLASS); 1777 break; 1778 case IPV6_AUTOFLOWLABEL: 1779 OPTSET(IN6P_AUTOFLOWLABEL); 1780 break; 1781 1782 case IPV6_ORIGDSTADDR: 1783 OPTSET2(INP_ORIGDSTADDR, optval); 1784 break; 1785 case IPV6_BINDANY: 1786 OPTSET(INP_BINDANY); 1787 break; 1788 case IPV6_VLAN_PCP: 1789 if ((optval >= -1) && (optval <= 1790 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) { 1791 if (optval == -1) { 1792 INP_WLOCK(inp); 1793 inp->inp_flags2 &= 1794 ~(INP_2PCP_SET | 1795 INP_2PCP_MASK); 1796 INP_WUNLOCK(inp); 1797 } else { 1798 INP_WLOCK(inp); 1799 inp->inp_flags2 |= 1800 INP_2PCP_SET; 1801 inp->inp_flags2 &= 1802 ~INP_2PCP_MASK; 1803 inp->inp_flags2 |= 1804 optval << 1805 INP_2PCP_SHIFT; 1806 INP_WUNLOCK(inp); 1807 } 1808 } else 1809 error = EINVAL; 1810 break; 1811 } 1812 break; 1813 1814 case IPV6_TCLASS: 1815 case IPV6_DONTFRAG: 1816 case IPV6_USE_MIN_MTU: 1817 case IPV6_PREFER_TEMPADDR: 1818 if (optlen != sizeof(optval)) { 1819 error = EINVAL; 1820 break; 1821 } 1822 error = sooptcopyin(sopt, &optval, 1823 sizeof optval, sizeof optval); 1824 if (error) 1825 break; 1826 { 1827 struct ip6_pktopts **optp; 1828 INP_WLOCK(inp); 1829 if (inp->inp_flags & INP_DROPPED) { 1830 INP_WUNLOCK(inp); 1831 return (ECONNRESET); 1832 } 1833 optp = &inp->in6p_outputopts; 1834 error = ip6_pcbopt(optname, 1835 (u_char *)&optval, sizeof(optval), 1836 optp, (td != NULL) ? td->td_ucred : 1837 NULL, uproto); 1838 INP_WUNLOCK(inp); 1839 break; 1840 } 1841 1842 case IPV6_2292PKTINFO: 1843 case IPV6_2292HOPLIMIT: 1844 case IPV6_2292HOPOPTS: 1845 case IPV6_2292DSTOPTS: 1846 case IPV6_2292RTHDR: 1847 /* RFC 2292 */ 1848 if (optlen != sizeof(int)) { 1849 error = EINVAL; 1850 break; 1851 } 1852 error = sooptcopyin(sopt, &optval, 1853 sizeof optval, sizeof optval); 1854 if (error) 1855 break; 1856 switch (optname) { 1857 case IPV6_2292PKTINFO: 1858 OPTSET2292(IN6P_PKTINFO); 1859 break; 1860 case IPV6_2292HOPLIMIT: 1861 OPTSET2292(IN6P_HOPLIMIT); 1862 break; 1863 case IPV6_2292HOPOPTS: 1864 /* 1865 * Check super-user privilege. 1866 * See comments for IPV6_RECVHOPOPTS. 1867 */ 1868 if (td != NULL) { 1869 error = priv_check(td, 1870 PRIV_NETINET_SETHDROPTS); 1871 if (error) 1872 return (error); 1873 } 1874 OPTSET2292(IN6P_HOPOPTS); 1875 break; 1876 case IPV6_2292DSTOPTS: 1877 if (td != NULL) { 1878 error = priv_check(td, 1879 PRIV_NETINET_SETHDROPTS); 1880 if (error) 1881 return (error); 1882 } 1883 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1884 break; 1885 case IPV6_2292RTHDR: 1886 OPTSET2292(IN6P_RTHDR); 1887 break; 1888 } 1889 break; 1890 case IPV6_PKTINFO: 1891 case IPV6_HOPOPTS: 1892 case IPV6_RTHDR: 1893 case IPV6_DSTOPTS: 1894 case IPV6_RTHDRDSTOPTS: 1895 case IPV6_NEXTHOP: 1896 { 1897 /* new advanced API (RFC3542) */ 1898 u_char *optbuf; 1899 u_char optbuf_storage[MCLBYTES]; 1900 int optlen; 1901 struct ip6_pktopts **optp; 1902 1903 /* cannot mix with RFC2292 */ 1904 if (OPTBIT(IN6P_RFC2292)) { 1905 error = EINVAL; 1906 break; 1907 } 1908 1909 /* 1910 * We only ensure valsize is not too large 1911 * here. Further validation will be done 1912 * later. 1913 */ 1914 error = sooptcopyin(sopt, optbuf_storage, 1915 sizeof(optbuf_storage), 0); 1916 if (error) 1917 break; 1918 optlen = sopt->sopt_valsize; 1919 optbuf = optbuf_storage; 1920 INP_WLOCK(inp); 1921 if (inp->inp_flags & INP_DROPPED) { 1922 INP_WUNLOCK(inp); 1923 return (ECONNRESET); 1924 } 1925 optp = &inp->in6p_outputopts; 1926 error = ip6_pcbopt(optname, optbuf, optlen, 1927 optp, (td != NULL) ? td->td_ucred : NULL, 1928 uproto); 1929 INP_WUNLOCK(inp); 1930 break; 1931 } 1932 #undef OPTSET 1933 1934 case IPV6_MULTICAST_IF: 1935 case IPV6_MULTICAST_HOPS: 1936 case IPV6_MULTICAST_LOOP: 1937 case IPV6_JOIN_GROUP: 1938 case IPV6_LEAVE_GROUP: 1939 case IPV6_MSFILTER: 1940 case MCAST_BLOCK_SOURCE: 1941 case MCAST_UNBLOCK_SOURCE: 1942 case MCAST_JOIN_GROUP: 1943 case MCAST_LEAVE_GROUP: 1944 case MCAST_JOIN_SOURCE_GROUP: 1945 case MCAST_LEAVE_SOURCE_GROUP: 1946 error = ip6_setmoptions(inp, sopt); 1947 break; 1948 1949 case IPV6_PORTRANGE: 1950 error = sooptcopyin(sopt, &optval, 1951 sizeof optval, sizeof optval); 1952 if (error) 1953 break; 1954 1955 INP_WLOCK(inp); 1956 switch (optval) { 1957 case IPV6_PORTRANGE_DEFAULT: 1958 inp->inp_flags &= ~(INP_LOWPORT); 1959 inp->inp_flags &= ~(INP_HIGHPORT); 1960 break; 1961 1962 case IPV6_PORTRANGE_HIGH: 1963 inp->inp_flags &= ~(INP_LOWPORT); 1964 inp->inp_flags |= INP_HIGHPORT; 1965 break; 1966 1967 case IPV6_PORTRANGE_LOW: 1968 inp->inp_flags &= ~(INP_HIGHPORT); 1969 inp->inp_flags |= INP_LOWPORT; 1970 break; 1971 1972 default: 1973 error = EINVAL; 1974 break; 1975 } 1976 INP_WUNLOCK(inp); 1977 break; 1978 1979 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1980 case IPV6_IPSEC_POLICY: 1981 if (IPSEC_ENABLED(ipv6)) { 1982 error = IPSEC_PCBCTL(ipv6, inp, sopt); 1983 break; 1984 } 1985 /* FALLTHROUGH */ 1986 #endif /* IPSEC */ 1987 1988 default: 1989 error = ENOPROTOOPT; 1990 break; 1991 } 1992 break; 1993 1994 case SOPT_GET: 1995 switch (optname) { 1996 case IPV6_2292PKTOPTIONS: 1997 #ifdef IPV6_PKTOPTIONS 1998 case IPV6_PKTOPTIONS: 1999 #endif 2000 /* 2001 * RFC3542 (effectively) deprecated the 2002 * semantics of the 2292-style pktoptions. 2003 * Since it was not reliable in nature (i.e., 2004 * applications had to expect the lack of some 2005 * information after all), it would make sense 2006 * to simplify this part by always returning 2007 * empty data. 2008 */ 2009 sopt->sopt_valsize = 0; 2010 break; 2011 2012 case IPV6_RECVHOPOPTS: 2013 case IPV6_RECVDSTOPTS: 2014 case IPV6_RECVRTHDRDSTOPTS: 2015 case IPV6_UNICAST_HOPS: 2016 case IPV6_RECVPKTINFO: 2017 case IPV6_RECVHOPLIMIT: 2018 case IPV6_RECVRTHDR: 2019 case IPV6_RECVPATHMTU: 2020 2021 case IPV6_V6ONLY: 2022 case IPV6_PORTRANGE: 2023 case IPV6_RECVTCLASS: 2024 case IPV6_AUTOFLOWLABEL: 2025 case IPV6_BINDANY: 2026 case IPV6_FLOWID: 2027 case IPV6_FLOWTYPE: 2028 case IPV6_RECVFLOWID: 2029 #ifdef RSS 2030 case IPV6_RSSBUCKETID: 2031 case IPV6_RECVRSSBUCKETID: 2032 #endif 2033 case IPV6_VLAN_PCP: 2034 switch (optname) { 2035 case IPV6_RECVHOPOPTS: 2036 optval = OPTBIT(IN6P_HOPOPTS); 2037 break; 2038 2039 case IPV6_RECVDSTOPTS: 2040 optval = OPTBIT(IN6P_DSTOPTS); 2041 break; 2042 2043 case IPV6_RECVRTHDRDSTOPTS: 2044 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 2045 break; 2046 2047 case IPV6_UNICAST_HOPS: 2048 optval = inp->in6p_hops; 2049 break; 2050 2051 case IPV6_RECVPKTINFO: 2052 optval = OPTBIT(IN6P_PKTINFO); 2053 break; 2054 2055 case IPV6_RECVHOPLIMIT: 2056 optval = OPTBIT(IN6P_HOPLIMIT); 2057 break; 2058 2059 case IPV6_RECVRTHDR: 2060 optval = OPTBIT(IN6P_RTHDR); 2061 break; 2062 2063 case IPV6_RECVPATHMTU: 2064 optval = OPTBIT(IN6P_MTU); 2065 break; 2066 2067 case IPV6_V6ONLY: 2068 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2069 break; 2070 2071 case IPV6_PORTRANGE: 2072 { 2073 int flags; 2074 flags = inp->inp_flags; 2075 if (flags & INP_HIGHPORT) 2076 optval = IPV6_PORTRANGE_HIGH; 2077 else if (flags & INP_LOWPORT) 2078 optval = IPV6_PORTRANGE_LOW; 2079 else 2080 optval = 0; 2081 break; 2082 } 2083 case IPV6_RECVTCLASS: 2084 optval = OPTBIT(IN6P_TCLASS); 2085 break; 2086 2087 case IPV6_AUTOFLOWLABEL: 2088 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2089 break; 2090 2091 case IPV6_ORIGDSTADDR: 2092 optval = OPTBIT2(INP_ORIGDSTADDR); 2093 break; 2094 2095 case IPV6_BINDANY: 2096 optval = OPTBIT(INP_BINDANY); 2097 break; 2098 2099 case IPV6_FLOWID: 2100 optval = inp->inp_flowid; 2101 break; 2102 2103 case IPV6_FLOWTYPE: 2104 optval = inp->inp_flowtype; 2105 break; 2106 2107 case IPV6_RECVFLOWID: 2108 optval = OPTBIT2(INP_RECVFLOWID); 2109 break; 2110 #ifdef RSS 2111 case IPV6_RSSBUCKETID: 2112 retval = 2113 rss_hash2bucket(inp->inp_flowid, 2114 inp->inp_flowtype, 2115 &rss_bucket); 2116 if (retval == 0) 2117 optval = rss_bucket; 2118 else 2119 error = EINVAL; 2120 break; 2121 2122 case IPV6_RECVRSSBUCKETID: 2123 optval = OPTBIT2(INP_RECVRSSBUCKETID); 2124 break; 2125 #endif 2126 2127 2128 case IPV6_VLAN_PCP: 2129 if (OPTBIT2(INP_2PCP_SET)) { 2130 optval = (inp->inp_flags2 & 2131 INP_2PCP_MASK) >> 2132 INP_2PCP_SHIFT; 2133 } else { 2134 optval = -1; 2135 } 2136 break; 2137 } 2138 2139 if (error) 2140 break; 2141 error = sooptcopyout(sopt, &optval, 2142 sizeof optval); 2143 break; 2144 2145 case IPV6_PATHMTU: 2146 { 2147 u_long pmtu = 0; 2148 struct ip6_mtuinfo mtuinfo; 2149 struct in6_addr addr; 2150 2151 if (!(so->so_state & SS_ISCONNECTED)) 2152 return (ENOTCONN); 2153 /* 2154 * XXX: we dot not consider the case of source 2155 * routing, or optional information to specify 2156 * the outgoing interface. 2157 * Copy faddr out of inp to avoid holding lock 2158 * on inp during route lookup. 2159 */ 2160 INP_RLOCK(inp); 2161 bcopy(&inp->in6p_faddr, &addr, sizeof(addr)); 2162 INP_RUNLOCK(inp); 2163 error = ip6_getpmtu_ctl(so->so_fibnum, 2164 &addr, &pmtu); 2165 if (error) 2166 break; 2167 if (pmtu > IPV6_MAXPACKET) 2168 pmtu = IPV6_MAXPACKET; 2169 2170 bzero(&mtuinfo, sizeof(mtuinfo)); 2171 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2172 optdata = (void *)&mtuinfo; 2173 optdatalen = sizeof(mtuinfo); 2174 error = sooptcopyout(sopt, optdata, 2175 optdatalen); 2176 break; 2177 } 2178 2179 case IPV6_2292PKTINFO: 2180 case IPV6_2292HOPLIMIT: 2181 case IPV6_2292HOPOPTS: 2182 case IPV6_2292RTHDR: 2183 case IPV6_2292DSTOPTS: 2184 switch (optname) { 2185 case IPV6_2292PKTINFO: 2186 optval = OPTBIT(IN6P_PKTINFO); 2187 break; 2188 case IPV6_2292HOPLIMIT: 2189 optval = OPTBIT(IN6P_HOPLIMIT); 2190 break; 2191 case IPV6_2292HOPOPTS: 2192 optval = OPTBIT(IN6P_HOPOPTS); 2193 break; 2194 case IPV6_2292RTHDR: 2195 optval = OPTBIT(IN6P_RTHDR); 2196 break; 2197 case IPV6_2292DSTOPTS: 2198 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2199 break; 2200 } 2201 error = sooptcopyout(sopt, &optval, 2202 sizeof optval); 2203 break; 2204 case IPV6_PKTINFO: 2205 case IPV6_HOPOPTS: 2206 case IPV6_RTHDR: 2207 case IPV6_DSTOPTS: 2208 case IPV6_RTHDRDSTOPTS: 2209 case IPV6_NEXTHOP: 2210 case IPV6_TCLASS: 2211 case IPV6_DONTFRAG: 2212 case IPV6_USE_MIN_MTU: 2213 case IPV6_PREFER_TEMPADDR: 2214 error = ip6_getpcbopt(inp, optname, sopt); 2215 break; 2216 2217 case IPV6_MULTICAST_IF: 2218 case IPV6_MULTICAST_HOPS: 2219 case IPV6_MULTICAST_LOOP: 2220 case IPV6_MSFILTER: 2221 error = ip6_getmoptions(inp, sopt); 2222 break; 2223 2224 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 2225 case IPV6_IPSEC_POLICY: 2226 if (IPSEC_ENABLED(ipv6)) { 2227 error = IPSEC_PCBCTL(ipv6, inp, sopt); 2228 break; 2229 } 2230 /* FALLTHROUGH */ 2231 #endif /* IPSEC */ 2232 default: 2233 error = ENOPROTOOPT; 2234 break; 2235 } 2236 break; 2237 } 2238 } 2239 return (error); 2240 } 2241 2242 int 2243 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2244 { 2245 int error = 0, optval, optlen; 2246 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2247 struct inpcb *inp = sotoinpcb(so); 2248 int level, op, optname; 2249 2250 level = sopt->sopt_level; 2251 op = sopt->sopt_dir; 2252 optname = sopt->sopt_name; 2253 optlen = sopt->sopt_valsize; 2254 2255 if (level != IPPROTO_IPV6) { 2256 return (EINVAL); 2257 } 2258 2259 switch (optname) { 2260 case IPV6_CHECKSUM: 2261 /* 2262 * For ICMPv6 sockets, no modification allowed for checksum 2263 * offset, permit "no change" values to help existing apps. 2264 * 2265 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2266 * for an ICMPv6 socket will fail." 2267 * The current behavior does not meet RFC3542. 2268 */ 2269 switch (op) { 2270 case SOPT_SET: 2271 if (optlen != sizeof(int)) { 2272 error = EINVAL; 2273 break; 2274 } 2275 error = sooptcopyin(sopt, &optval, sizeof(optval), 2276 sizeof(optval)); 2277 if (error) 2278 break; 2279 if (optval < -1 || (optval % 2) != 0) { 2280 /* 2281 * The API assumes non-negative even offset 2282 * values or -1 as a special value. 2283 */ 2284 error = EINVAL; 2285 } else if (inp->inp_ip_p == IPPROTO_ICMPV6) { 2286 if (optval != icmp6off) 2287 error = EINVAL; 2288 } else 2289 inp->in6p_cksum = optval; 2290 break; 2291 2292 case SOPT_GET: 2293 if (inp->inp_ip_p == IPPROTO_ICMPV6) 2294 optval = icmp6off; 2295 else 2296 optval = inp->in6p_cksum; 2297 2298 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2299 break; 2300 2301 default: 2302 error = EINVAL; 2303 break; 2304 } 2305 break; 2306 2307 default: 2308 error = ENOPROTOOPT; 2309 break; 2310 } 2311 2312 return (error); 2313 } 2314 2315 /* 2316 * Set up IP6 options in pcb for insertion in output packets or 2317 * specifying behavior of outgoing packets. 2318 */ 2319 static int 2320 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2321 struct socket *so, struct sockopt *sopt) 2322 { 2323 struct ip6_pktopts *opt = *pktopt; 2324 int error = 0; 2325 struct thread *td = sopt->sopt_td; 2326 struct epoch_tracker et; 2327 2328 /* turn off any old options. */ 2329 if (opt) { 2330 #ifdef DIAGNOSTIC 2331 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2332 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2333 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2334 printf("ip6_pcbopts: all specified options are cleared.\n"); 2335 #endif 2336 ip6_clearpktopts(opt, -1); 2337 } else { 2338 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2339 if (opt == NULL) 2340 return (ENOMEM); 2341 } 2342 *pktopt = NULL; 2343 2344 if (!m || m->m_len == 0) { 2345 /* 2346 * Only turning off any previous options, regardless of 2347 * whether the opt is just created or given. 2348 */ 2349 free(opt, M_IP6OPT); 2350 return (0); 2351 } 2352 2353 /* set options specified by user. */ 2354 NET_EPOCH_ENTER(et); 2355 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2356 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2357 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2358 free(opt, M_IP6OPT); 2359 NET_EPOCH_EXIT(et); 2360 return (error); 2361 } 2362 NET_EPOCH_EXIT(et); 2363 *pktopt = opt; 2364 return (0); 2365 } 2366 2367 /* 2368 * initialize ip6_pktopts. beware that there are non-zero default values in 2369 * the struct. 2370 */ 2371 void 2372 ip6_initpktopts(struct ip6_pktopts *opt) 2373 { 2374 2375 bzero(opt, sizeof(*opt)); 2376 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2377 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2378 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2379 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2380 } 2381 2382 static int 2383 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2384 struct ucred *cred, int uproto) 2385 { 2386 struct epoch_tracker et; 2387 struct ip6_pktopts *opt; 2388 int ret; 2389 2390 if (*pktopt == NULL) { 2391 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2392 M_NOWAIT); 2393 if (*pktopt == NULL) 2394 return (ENOBUFS); 2395 ip6_initpktopts(*pktopt); 2396 } 2397 opt = *pktopt; 2398 2399 NET_EPOCH_ENTER(et); 2400 ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto); 2401 NET_EPOCH_EXIT(et); 2402 2403 return (ret); 2404 } 2405 2406 #define GET_PKTOPT_VAR(field, lenexpr) do { \ 2407 if (pktopt && pktopt->field) { \ 2408 INP_RUNLOCK(inp); \ 2409 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \ 2410 malloc_optdata = true; \ 2411 INP_RLOCK(inp); \ 2412 if (inp->inp_flags & INP_DROPPED) { \ 2413 INP_RUNLOCK(inp); \ 2414 free(optdata, M_TEMP); \ 2415 return (ECONNRESET); \ 2416 } \ 2417 pktopt = inp->in6p_outputopts; \ 2418 if (pktopt && pktopt->field) { \ 2419 optdatalen = min(lenexpr, sopt->sopt_valsize); \ 2420 bcopy(pktopt->field, optdata, optdatalen); \ 2421 } else { \ 2422 free(optdata, M_TEMP); \ 2423 optdata = NULL; \ 2424 malloc_optdata = false; \ 2425 } \ 2426 } \ 2427 } while(0) 2428 2429 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \ 2430 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3) 2431 2432 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \ 2433 pktopt->field->sa_len) 2434 2435 static int 2436 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt) 2437 { 2438 void *optdata = NULL; 2439 bool malloc_optdata = false; 2440 int optdatalen = 0; 2441 int error = 0; 2442 struct in6_pktinfo null_pktinfo; 2443 int deftclass = 0, on; 2444 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2445 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2446 struct ip6_pktopts *pktopt; 2447 2448 INP_RLOCK(inp); 2449 pktopt = inp->in6p_outputopts; 2450 2451 switch (optname) { 2452 case IPV6_PKTINFO: 2453 optdata = (void *)&null_pktinfo; 2454 if (pktopt && pktopt->ip6po_pktinfo) { 2455 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo, 2456 sizeof(null_pktinfo)); 2457 in6_clearscope(&null_pktinfo.ipi6_addr); 2458 } else { 2459 /* XXX: we don't have to do this every time... */ 2460 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2461 } 2462 optdatalen = sizeof(struct in6_pktinfo); 2463 break; 2464 case IPV6_TCLASS: 2465 if (pktopt && pktopt->ip6po_tclass >= 0) 2466 deftclass = pktopt->ip6po_tclass; 2467 optdata = (void *)&deftclass; 2468 optdatalen = sizeof(int); 2469 break; 2470 case IPV6_HOPOPTS: 2471 GET_PKTOPT_EXT_HDR(ip6po_hbh); 2472 break; 2473 case IPV6_RTHDR: 2474 GET_PKTOPT_EXT_HDR(ip6po_rthdr); 2475 break; 2476 case IPV6_RTHDRDSTOPTS: 2477 GET_PKTOPT_EXT_HDR(ip6po_dest1); 2478 break; 2479 case IPV6_DSTOPTS: 2480 GET_PKTOPT_EXT_HDR(ip6po_dest2); 2481 break; 2482 case IPV6_NEXTHOP: 2483 GET_PKTOPT_SOCKADDR(ip6po_nexthop); 2484 break; 2485 case IPV6_USE_MIN_MTU: 2486 if (pktopt) 2487 defminmtu = pktopt->ip6po_minmtu; 2488 optdata = (void *)&defminmtu; 2489 optdatalen = sizeof(int); 2490 break; 2491 case IPV6_DONTFRAG: 2492 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2493 on = 1; 2494 else 2495 on = 0; 2496 optdata = (void *)&on; 2497 optdatalen = sizeof(on); 2498 break; 2499 case IPV6_PREFER_TEMPADDR: 2500 if (pktopt) 2501 defpreftemp = pktopt->ip6po_prefer_tempaddr; 2502 optdata = (void *)&defpreftemp; 2503 optdatalen = sizeof(int); 2504 break; 2505 default: /* should not happen */ 2506 #ifdef DIAGNOSTIC 2507 panic("ip6_getpcbopt: unexpected option\n"); 2508 #endif 2509 INP_RUNLOCK(inp); 2510 return (ENOPROTOOPT); 2511 } 2512 INP_RUNLOCK(inp); 2513 2514 error = sooptcopyout(sopt, optdata, optdatalen); 2515 if (malloc_optdata) 2516 free(optdata, M_TEMP); 2517 2518 return (error); 2519 } 2520 2521 void 2522 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2523 { 2524 if (pktopt == NULL) 2525 return; 2526 2527 if (optname == -1 || optname == IPV6_PKTINFO) { 2528 if (pktopt->ip6po_pktinfo) 2529 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2530 pktopt->ip6po_pktinfo = NULL; 2531 } 2532 if (optname == -1 || optname == IPV6_HOPLIMIT) { 2533 pktopt->ip6po_hlim = -1; 2534 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM; 2535 } 2536 if (optname == -1 || optname == IPV6_TCLASS) { 2537 pktopt->ip6po_tclass = -1; 2538 pktopt->ip6po_valid &= ~IP6PO_VALID_TC; 2539 } 2540 if (optname == -1 || optname == IPV6_NEXTHOP) { 2541 if (pktopt->ip6po_nextroute.ro_nh) { 2542 NH_FREE(pktopt->ip6po_nextroute.ro_nh); 2543 pktopt->ip6po_nextroute.ro_nh = NULL; 2544 } 2545 if (pktopt->ip6po_nexthop) 2546 free(pktopt->ip6po_nexthop, M_IP6OPT); 2547 pktopt->ip6po_nexthop = NULL; 2548 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO; 2549 } 2550 if (optname == -1 || optname == IPV6_HOPOPTS) { 2551 if (pktopt->ip6po_hbh) 2552 free(pktopt->ip6po_hbh, M_IP6OPT); 2553 pktopt->ip6po_hbh = NULL; 2554 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH; 2555 } 2556 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2557 if (pktopt->ip6po_dest1) 2558 free(pktopt->ip6po_dest1, M_IP6OPT); 2559 pktopt->ip6po_dest1 = NULL; 2560 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1; 2561 } 2562 if (optname == -1 || optname == IPV6_RTHDR) { 2563 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2564 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2565 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2566 if (pktopt->ip6po_route.ro_nh) { 2567 NH_FREE(pktopt->ip6po_route.ro_nh); 2568 pktopt->ip6po_route.ro_nh = NULL; 2569 } 2570 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO; 2571 } 2572 if (optname == -1 || optname == IPV6_DSTOPTS) { 2573 if (pktopt->ip6po_dest2) 2574 free(pktopt->ip6po_dest2, M_IP6OPT); 2575 pktopt->ip6po_dest2 = NULL; 2576 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2; 2577 } 2578 } 2579 2580 #define PKTOPT_EXTHDRCPY(type) \ 2581 do {\ 2582 if (src->type) {\ 2583 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2584 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2585 if (dst->type == NULL)\ 2586 goto bad;\ 2587 bcopy(src->type, dst->type, hlen);\ 2588 }\ 2589 } while (/*CONSTCOND*/ 0) 2590 2591 static int 2592 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2593 { 2594 if (dst == NULL || src == NULL) { 2595 printf("ip6_clearpktopts: invalid argument\n"); 2596 return (EINVAL); 2597 } 2598 2599 dst->ip6po_hlim = src->ip6po_hlim; 2600 dst->ip6po_tclass = src->ip6po_tclass; 2601 dst->ip6po_flags = src->ip6po_flags; 2602 dst->ip6po_minmtu = src->ip6po_minmtu; 2603 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2604 if (src->ip6po_pktinfo) { 2605 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2606 M_IP6OPT, canwait); 2607 if (dst->ip6po_pktinfo == NULL) 2608 goto bad; 2609 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2610 } 2611 if (src->ip6po_nexthop) { 2612 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2613 M_IP6OPT, canwait); 2614 if (dst->ip6po_nexthop == NULL) 2615 goto bad; 2616 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2617 src->ip6po_nexthop->sa_len); 2618 } 2619 PKTOPT_EXTHDRCPY(ip6po_hbh); 2620 PKTOPT_EXTHDRCPY(ip6po_dest1); 2621 PKTOPT_EXTHDRCPY(ip6po_dest2); 2622 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2623 dst->ip6po_valid = src->ip6po_valid; 2624 return (0); 2625 2626 bad: 2627 ip6_clearpktopts(dst, -1); 2628 return (ENOBUFS); 2629 } 2630 #undef PKTOPT_EXTHDRCPY 2631 2632 struct ip6_pktopts * 2633 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2634 { 2635 int error; 2636 struct ip6_pktopts *dst; 2637 2638 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2639 if (dst == NULL) 2640 return (NULL); 2641 ip6_initpktopts(dst); 2642 2643 if ((error = copypktopts(dst, src, canwait)) != 0) { 2644 free(dst, M_IP6OPT); 2645 return (NULL); 2646 } 2647 2648 return (dst); 2649 } 2650 2651 void 2652 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2653 { 2654 if (pktopt == NULL) 2655 return; 2656 2657 ip6_clearpktopts(pktopt, -1); 2658 2659 free(pktopt, M_IP6OPT); 2660 } 2661 2662 /* 2663 * Set IPv6 outgoing packet options based on advanced API. 2664 */ 2665 int 2666 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2667 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2668 { 2669 struct cmsghdr *cm = NULL; 2670 2671 if (control == NULL || opt == NULL) 2672 return (EINVAL); 2673 2674 /* 2675 * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we 2676 * are in the network epoch here. 2677 */ 2678 NET_EPOCH_ASSERT(); 2679 2680 ip6_initpktopts(opt); 2681 if (stickyopt) { 2682 int error; 2683 2684 /* 2685 * If stickyopt is provided, make a local copy of the options 2686 * for this particular packet, then override them by ancillary 2687 * objects. 2688 * XXX: copypktopts() does not copy the cached route to a next 2689 * hop (if any). This is not very good in terms of efficiency, 2690 * but we can allow this since this option should be rarely 2691 * used. 2692 */ 2693 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2694 return (error); 2695 } 2696 2697 /* 2698 * XXX: Currently, we assume all the optional information is stored 2699 * in a single mbuf. 2700 */ 2701 if (control->m_next) 2702 return (EINVAL); 2703 2704 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2705 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2706 int error; 2707 2708 if (control->m_len < CMSG_LEN(0)) 2709 return (EINVAL); 2710 2711 cm = mtod(control, struct cmsghdr *); 2712 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2713 return (EINVAL); 2714 if (cm->cmsg_level != IPPROTO_IPV6) 2715 continue; 2716 2717 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2718 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2719 if (error) 2720 return (error); 2721 } 2722 2723 return (0); 2724 } 2725 2726 /* 2727 * Set a particular packet option, as a sticky option or an ancillary data 2728 * item. "len" can be 0 only when it's a sticky option. 2729 * We have 4 cases of combination of "sticky" and "cmsg": 2730 * "sticky=0, cmsg=0": impossible 2731 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2732 * "sticky=1, cmsg=0": RFC3542 socket option 2733 * "sticky=1, cmsg=1": RFC2292 socket option 2734 */ 2735 static int 2736 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2737 struct ucred *cred, int sticky, int cmsg, int uproto) 2738 { 2739 int minmtupolicy, preftemp; 2740 int error; 2741 2742 NET_EPOCH_ASSERT(); 2743 2744 if (!sticky && !cmsg) { 2745 #ifdef DIAGNOSTIC 2746 printf("ip6_setpktopt: impossible case\n"); 2747 #endif 2748 return (EINVAL); 2749 } 2750 2751 /* 2752 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2753 * not be specified in the context of RFC3542. Conversely, 2754 * RFC3542 types should not be specified in the context of RFC2292. 2755 */ 2756 if (!cmsg) { 2757 switch (optname) { 2758 case IPV6_2292PKTINFO: 2759 case IPV6_2292HOPLIMIT: 2760 case IPV6_2292NEXTHOP: 2761 case IPV6_2292HOPOPTS: 2762 case IPV6_2292DSTOPTS: 2763 case IPV6_2292RTHDR: 2764 case IPV6_2292PKTOPTIONS: 2765 return (ENOPROTOOPT); 2766 } 2767 } 2768 if (sticky && cmsg) { 2769 switch (optname) { 2770 case IPV6_PKTINFO: 2771 case IPV6_HOPLIMIT: 2772 case IPV6_NEXTHOP: 2773 case IPV6_HOPOPTS: 2774 case IPV6_DSTOPTS: 2775 case IPV6_RTHDRDSTOPTS: 2776 case IPV6_RTHDR: 2777 case IPV6_USE_MIN_MTU: 2778 case IPV6_DONTFRAG: 2779 case IPV6_TCLASS: 2780 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2781 return (ENOPROTOOPT); 2782 } 2783 } 2784 2785 switch (optname) { 2786 case IPV6_2292PKTINFO: 2787 case IPV6_PKTINFO: 2788 { 2789 struct ifnet *ifp = NULL; 2790 struct in6_pktinfo *pktinfo; 2791 2792 if (len != sizeof(struct in6_pktinfo)) 2793 return (EINVAL); 2794 2795 pktinfo = (struct in6_pktinfo *)buf; 2796 2797 /* 2798 * An application can clear any sticky IPV6_PKTINFO option by 2799 * doing a "regular" setsockopt with ipi6_addr being 2800 * in6addr_any and ipi6_ifindex being zero. 2801 * [RFC 3542, Section 6] 2802 */ 2803 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2804 pktinfo->ipi6_ifindex == 0 && 2805 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2806 ip6_clearpktopts(opt, optname); 2807 break; 2808 } 2809 2810 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2811 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2812 return (EINVAL); 2813 } 2814 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) 2815 return (EINVAL); 2816 /* validate the interface index if specified. */ 2817 if (pktinfo->ipi6_ifindex) { 2818 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2819 if (ifp == NULL) 2820 return (ENXIO); 2821 } 2822 if (ifp != NULL && (ifp->if_inet6 == NULL || 2823 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED) != 0)) 2824 return (ENETDOWN); 2825 2826 if (ifp != NULL && 2827 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2828 struct in6_ifaddr *ia; 2829 2830 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL); 2831 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr); 2832 if (ia == NULL) 2833 return (EADDRNOTAVAIL); 2834 ifa_free(&ia->ia_ifa); 2835 } 2836 /* 2837 * We store the address anyway, and let in6_selectsrc() 2838 * validate the specified address. This is because ipi6_addr 2839 * may not have enough information about its scope zone, and 2840 * we may need additional information (such as outgoing 2841 * interface or the scope zone of a destination address) to 2842 * disambiguate the scope. 2843 * XXX: the delay of the validation may confuse the 2844 * application when it is used as a sticky option. 2845 */ 2846 if (opt->ip6po_pktinfo == NULL) { 2847 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2848 M_IP6OPT, M_NOWAIT); 2849 if (opt->ip6po_pktinfo == NULL) 2850 return (ENOBUFS); 2851 } 2852 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2853 opt->ip6po_valid |= IP6PO_VALID_PKTINFO; 2854 break; 2855 } 2856 2857 case IPV6_2292HOPLIMIT: 2858 case IPV6_HOPLIMIT: 2859 { 2860 int *hlimp; 2861 2862 /* 2863 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2864 * to simplify the ordering among hoplimit options. 2865 */ 2866 if (optname == IPV6_HOPLIMIT && sticky) 2867 return (ENOPROTOOPT); 2868 2869 if (len != sizeof(int)) 2870 return (EINVAL); 2871 hlimp = (int *)buf; 2872 if (*hlimp < -1 || *hlimp > 255) 2873 return (EINVAL); 2874 2875 opt->ip6po_hlim = *hlimp; 2876 opt->ip6po_valid |= IP6PO_VALID_HLIM; 2877 break; 2878 } 2879 2880 case IPV6_TCLASS: 2881 { 2882 int tclass; 2883 2884 if (len != sizeof(int)) 2885 return (EINVAL); 2886 tclass = *(int *)buf; 2887 if (tclass < -1 || tclass > 255) 2888 return (EINVAL); 2889 2890 opt->ip6po_tclass = tclass; 2891 opt->ip6po_valid |= IP6PO_VALID_TC; 2892 break; 2893 } 2894 2895 case IPV6_2292NEXTHOP: 2896 case IPV6_NEXTHOP: 2897 if (cred != NULL) { 2898 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2899 if (error) 2900 return (error); 2901 } 2902 2903 if (len == 0) { /* just remove the option */ 2904 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2905 break; 2906 } 2907 2908 /* check if cmsg_len is large enough for sa_len */ 2909 if (len < sizeof(struct sockaddr) || len < *buf) 2910 return (EINVAL); 2911 2912 switch (((struct sockaddr *)buf)->sa_family) { 2913 case AF_INET6: 2914 { 2915 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2916 int error; 2917 2918 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2919 return (EINVAL); 2920 2921 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2922 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2923 return (EINVAL); 2924 } 2925 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2926 != 0) { 2927 return (error); 2928 } 2929 break; 2930 } 2931 case AF_LINK: /* should eventually be supported */ 2932 default: 2933 return (EAFNOSUPPORT); 2934 } 2935 2936 /* turn off the previous option, then set the new option. */ 2937 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2938 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2939 if (opt->ip6po_nexthop == NULL) 2940 return (ENOBUFS); 2941 bcopy(buf, opt->ip6po_nexthop, *buf); 2942 opt->ip6po_valid |= IP6PO_VALID_NHINFO; 2943 break; 2944 2945 case IPV6_2292HOPOPTS: 2946 case IPV6_HOPOPTS: 2947 { 2948 struct ip6_hbh *hbh; 2949 int hbhlen; 2950 2951 /* 2952 * XXX: We don't allow a non-privileged user to set ANY HbH 2953 * options, since per-option restriction has too much 2954 * overhead. 2955 */ 2956 if (cred != NULL) { 2957 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2958 if (error) 2959 return (error); 2960 } 2961 2962 if (len == 0) { 2963 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2964 break; /* just remove the option */ 2965 } 2966 2967 /* message length validation */ 2968 if (len < sizeof(struct ip6_hbh)) 2969 return (EINVAL); 2970 hbh = (struct ip6_hbh *)buf; 2971 hbhlen = (hbh->ip6h_len + 1) << 3; 2972 if (len != hbhlen) 2973 return (EINVAL); 2974 2975 /* turn off the previous option, then set the new option. */ 2976 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2977 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2978 if (opt->ip6po_hbh == NULL) 2979 return (ENOBUFS); 2980 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2981 opt->ip6po_valid |= IP6PO_VALID_HBH; 2982 2983 break; 2984 } 2985 2986 case IPV6_2292DSTOPTS: 2987 case IPV6_DSTOPTS: 2988 case IPV6_RTHDRDSTOPTS: 2989 { 2990 struct ip6_dest *dest, **newdest = NULL; 2991 int destlen; 2992 2993 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2994 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2995 if (error) 2996 return (error); 2997 } 2998 2999 if (len == 0) { 3000 ip6_clearpktopts(opt, optname); 3001 break; /* just remove the option */ 3002 } 3003 3004 /* message length validation */ 3005 if (len < sizeof(struct ip6_dest)) 3006 return (EINVAL); 3007 dest = (struct ip6_dest *)buf; 3008 destlen = (dest->ip6d_len + 1) << 3; 3009 if (len != destlen) 3010 return (EINVAL); 3011 3012 /* 3013 * Determine the position that the destination options header 3014 * should be inserted; before or after the routing header. 3015 */ 3016 switch (optname) { 3017 case IPV6_2292DSTOPTS: 3018 /* 3019 * The old advacned API is ambiguous on this point. 3020 * Our approach is to determine the position based 3021 * according to the existence of a routing header. 3022 * Note, however, that this depends on the order of the 3023 * extension headers in the ancillary data; the 1st 3024 * part of the destination options header must appear 3025 * before the routing header in the ancillary data, 3026 * too. 3027 * RFC3542 solved the ambiguity by introducing 3028 * separate ancillary data or option types. 3029 */ 3030 if (opt->ip6po_rthdr == NULL) 3031 newdest = &opt->ip6po_dest1; 3032 else 3033 newdest = &opt->ip6po_dest2; 3034 break; 3035 case IPV6_RTHDRDSTOPTS: 3036 newdest = &opt->ip6po_dest1; 3037 break; 3038 case IPV6_DSTOPTS: 3039 newdest = &opt->ip6po_dest2; 3040 break; 3041 } 3042 3043 /* turn off the previous option, then set the new option. */ 3044 ip6_clearpktopts(opt, optname); 3045 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3046 if (*newdest == NULL) 3047 return (ENOBUFS); 3048 bcopy(dest, *newdest, destlen); 3049 if (newdest == &opt->ip6po_dest1) 3050 opt->ip6po_valid |= IP6PO_VALID_DEST1; 3051 else 3052 opt->ip6po_valid |= IP6PO_VALID_DEST2; 3053 3054 break; 3055 } 3056 3057 case IPV6_2292RTHDR: 3058 case IPV6_RTHDR: 3059 { 3060 struct ip6_rthdr *rth; 3061 int rthlen; 3062 3063 if (len == 0) { 3064 ip6_clearpktopts(opt, IPV6_RTHDR); 3065 break; /* just remove the option */ 3066 } 3067 3068 /* message length validation */ 3069 if (len < sizeof(struct ip6_rthdr)) 3070 return (EINVAL); 3071 rth = (struct ip6_rthdr *)buf; 3072 rthlen = (rth->ip6r_len + 1) << 3; 3073 if (len != rthlen) 3074 return (EINVAL); 3075 3076 switch (rth->ip6r_type) { 3077 case IPV6_RTHDR_TYPE_0: 3078 if (rth->ip6r_len == 0) /* must contain one addr */ 3079 return (EINVAL); 3080 if (rth->ip6r_len % 2) /* length must be even */ 3081 return (EINVAL); 3082 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3083 return (EINVAL); 3084 break; 3085 default: 3086 return (EINVAL); /* not supported */ 3087 } 3088 3089 /* turn off the previous option */ 3090 ip6_clearpktopts(opt, IPV6_RTHDR); 3091 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3092 if (opt->ip6po_rthdr == NULL) 3093 return (ENOBUFS); 3094 bcopy(rth, opt->ip6po_rthdr, rthlen); 3095 opt->ip6po_valid |= IP6PO_VALID_RHINFO; 3096 3097 break; 3098 } 3099 3100 case IPV6_USE_MIN_MTU: 3101 if (len != sizeof(int)) 3102 return (EINVAL); 3103 minmtupolicy = *(int *)buf; 3104 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3105 minmtupolicy != IP6PO_MINMTU_DISABLE && 3106 minmtupolicy != IP6PO_MINMTU_ALL) { 3107 return (EINVAL); 3108 } 3109 opt->ip6po_minmtu = minmtupolicy; 3110 break; 3111 3112 case IPV6_DONTFRAG: 3113 if (len != sizeof(int)) 3114 return (EINVAL); 3115 3116 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3117 /* 3118 * we ignore this option for TCP sockets. 3119 * (RFC3542 leaves this case unspecified.) 3120 */ 3121 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3122 } else 3123 opt->ip6po_flags |= IP6PO_DONTFRAG; 3124 break; 3125 3126 case IPV6_PREFER_TEMPADDR: 3127 if (len != sizeof(int)) 3128 return (EINVAL); 3129 preftemp = *(int *)buf; 3130 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3131 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3132 preftemp != IP6PO_TEMPADDR_PREFER) { 3133 return (EINVAL); 3134 } 3135 opt->ip6po_prefer_tempaddr = preftemp; 3136 break; 3137 3138 default: 3139 return (ENOPROTOOPT); 3140 } /* end of switch */ 3141 3142 return (0); 3143 } 3144 3145 /* 3146 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3147 * packet to the input queue of a specified interface. Note that this 3148 * calls the output routine of the loopback "driver", but with an interface 3149 * pointer that might NOT be &loif -- easier than replicating that code here. 3150 */ 3151 void 3152 ip6_mloopback(struct ifnet *ifp, struct mbuf *m) 3153 { 3154 struct mbuf *copym; 3155 struct ip6_hdr *ip6; 3156 3157 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT); 3158 if (copym == NULL) 3159 return; 3160 3161 /* 3162 * Make sure to deep-copy IPv6 header portion in case the data 3163 * is in an mbuf cluster, so that we can safely override the IPv6 3164 * header portion later. 3165 */ 3166 if (!M_WRITABLE(copym) || 3167 copym->m_len < sizeof(struct ip6_hdr)) { 3168 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3169 if (copym == NULL) 3170 return; 3171 } 3172 ip6 = mtod(copym, struct ip6_hdr *); 3173 /* 3174 * clear embedded scope identifiers if necessary. 3175 * in6_clearscope will touch the addresses only when necessary. 3176 */ 3177 in6_clearscope(&ip6->ip6_src); 3178 in6_clearscope(&ip6->ip6_dst); 3179 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3180 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3181 CSUM_PSEUDO_HDR; 3182 copym->m_pkthdr.csum_data = 0xffff; 3183 } 3184 if_simloop(ifp, copym, AF_INET6, 0); 3185 } 3186 3187 /* 3188 * Chop IPv6 header off from the payload. 3189 */ 3190 static int 3191 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3192 { 3193 struct mbuf *mh; 3194 struct ip6_hdr *ip6; 3195 3196 ip6 = mtod(m, struct ip6_hdr *); 3197 if (m->m_len > sizeof(*ip6)) { 3198 mh = m_gethdr(M_NOWAIT, MT_DATA); 3199 if (mh == NULL) { 3200 m_freem(m); 3201 return ENOBUFS; 3202 } 3203 m_move_pkthdr(mh, m); 3204 M_ALIGN(mh, sizeof(*ip6)); 3205 m->m_len -= sizeof(*ip6); 3206 m->m_data += sizeof(*ip6); 3207 mh->m_next = m; 3208 m = mh; 3209 m->m_len = sizeof(*ip6); 3210 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3211 } 3212 exthdrs->ip6e_ip6 = m; 3213 return 0; 3214 } 3215 3216 /* 3217 * Compute IPv6 extension header length. 3218 */ 3219 int 3220 ip6_optlen(struct inpcb *inp) 3221 { 3222 int len; 3223 3224 if (!inp->in6p_outputopts) 3225 return 0; 3226 3227 len = 0; 3228 #define elen(x) \ 3229 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3230 3231 len += elen(inp->in6p_outputopts->ip6po_hbh); 3232 if (inp->in6p_outputopts->ip6po_rthdr) 3233 /* dest1 is valid with rthdr only */ 3234 len += elen(inp->in6p_outputopts->ip6po_dest1); 3235 len += elen(inp->in6p_outputopts->ip6po_rthdr); 3236 len += elen(inp->in6p_outputopts->ip6po_dest2); 3237 return len; 3238 #undef elen 3239 } 3240