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 #include <netinet6/ip6_mroute.h> 114 115 #include <netipsec/ipsec_support.h> 116 #if defined(SCTP) || defined(SCTP_SUPPORT) 117 #include <netinet/sctp.h> 118 #include <netinet/sctp_crc32.h> 119 #endif 120 121 #include <netinet6/scope6_var.h> 122 123 extern int in6_mcast_loop; 124 125 struct ip6_exthdrs { 126 struct mbuf *ip6e_ip6; 127 struct mbuf *ip6e_hbh; 128 struct mbuf *ip6e_dest1; 129 struct mbuf *ip6e_rthdr; 130 struct mbuf *ip6e_dest2; 131 }; 132 133 static MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options"); 134 135 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 136 struct ucred *, int); 137 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 138 struct socket *, struct sockopt *); 139 static int ip6_getpcbopt(struct inpcb *, int, struct sockopt *); 140 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 141 struct ucred *, int, int, int); 142 143 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 144 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 145 struct ip6_frag **); 146 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 147 static void ip6_getpmtu(struct route_in6 *, int, 148 struct ifnet *, const struct in6_addr *, u_long *, u_int, u_int); 149 static void ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long, 150 u_long *, u_int); 151 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *); 152 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 153 154 /* 155 * Make an extension header from option data. hp is the source, 156 * mp is the destination, and _ol is the optlen. 157 */ 158 #define MAKE_EXTHDR(hp, mp, _ol) \ 159 do { \ 160 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 161 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 162 ((eh)->ip6e_len + 1) << 3); \ 163 if (error) \ 164 goto freehdrs; \ 165 (_ol) += (*(mp))->m_len; \ 166 } while (/*CONSTCOND*/ 0) 167 168 /* 169 * Form a chain of extension headers. 170 * m is the extension header mbuf 171 * mp is the previous mbuf in the chain 172 * p is the next header 173 * i is the type of option. 174 */ 175 #define MAKE_CHAIN(m, mp, p, i)\ 176 do {\ 177 if (m) {\ 178 if (!hdrsplit) \ 179 panic("%s:%d: assumption failed: "\ 180 "hdr not split: hdrsplit %d exthdrs %p",\ 181 __func__, __LINE__, hdrsplit, &exthdrs);\ 182 *mtod((m), u_char *) = *(p);\ 183 *(p) = (i);\ 184 p = mtod((m), u_char *);\ 185 (m)->m_next = (mp)->m_next;\ 186 (mp)->m_next = (m);\ 187 (mp) = (m);\ 188 }\ 189 } while (/*CONSTCOND*/ 0) 190 191 void 192 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 193 { 194 u_short csum; 195 196 csum = in_cksum_skip(m, offset + plen, offset); 197 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 198 csum = 0xffff; 199 offset += m->m_pkthdr.csum_data; /* checksum offset */ 200 201 if (offset + sizeof(csum) > m->m_len) 202 m_copyback(m, offset, sizeof(csum), (caddr_t)&csum); 203 else 204 *(u_short *)mtodo(m, offset) = csum; 205 } 206 207 static void 208 ip6_output_delayed_csum(struct mbuf *m, struct ifnet *ifp, int csum_flags, 209 int plen, int optlen) 210 { 211 212 KASSERT((plen >= optlen), ("%s:%d: plen %d < optlen %d, m %p, ifp %p " 213 "csum_flags %#x", 214 __func__, __LINE__, plen, optlen, m, ifp, csum_flags)); 215 216 if (csum_flags & CSUM_DELAY_DATA_IPV6) { 217 in6_delayed_cksum(m, plen - optlen, 218 sizeof(struct ip6_hdr) + optlen); 219 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 220 } 221 #if defined(SCTP) || defined(SCTP_SUPPORT) 222 if (csum_flags & CSUM_SCTP_IPV6) { 223 sctp_delayed_cksum(m, sizeof(struct ip6_hdr) + optlen); 224 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 225 } 226 #endif 227 } 228 229 int 230 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 231 int fraglen , uint32_t id) 232 { 233 struct mbuf *m, **mnext, *m_frgpart; 234 struct ip6_hdr *ip6, *mhip6; 235 struct ip6_frag *ip6f; 236 int off; 237 int error; 238 int tlen = m0->m_pkthdr.len; 239 240 KASSERT((fraglen % 8 == 0), ("Fragment length must be a multiple of 8")); 241 242 m = m0; 243 ip6 = mtod(m, struct ip6_hdr *); 244 mnext = &m->m_nextpkt; 245 246 for (off = hlen; off < tlen; off += fraglen) { 247 m = m_gethdr(M_NOWAIT, MT_DATA); 248 if (!m) { 249 IP6STAT_INC(ip6s_odropped); 250 return (ENOBUFS); 251 } 252 253 /* 254 * Make sure the complete packet header gets copied 255 * from the originating mbuf to the newly created 256 * mbuf. This also ensures that existing firewall 257 * classification(s), VLAN tags and so on get copied 258 * to the resulting fragmented packet(s): 259 */ 260 if (m_dup_pkthdr(m, m0, M_NOWAIT) == 0) { 261 m_free(m); 262 IP6STAT_INC(ip6s_odropped); 263 return (ENOBUFS); 264 } 265 266 *mnext = m; 267 mnext = &m->m_nextpkt; 268 m->m_data += max_linkhdr; 269 mhip6 = mtod(m, struct ip6_hdr *); 270 *mhip6 = *ip6; 271 m->m_len = sizeof(*mhip6); 272 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 273 if (error) { 274 IP6STAT_INC(ip6s_odropped); 275 return (error); 276 } 277 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 278 if (off + fraglen >= tlen) 279 fraglen = tlen - off; 280 else 281 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 282 mhip6->ip6_plen = htons((u_short)(fraglen + hlen + 283 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 284 if ((m_frgpart = m_copym(m0, off, fraglen, M_NOWAIT)) == NULL) { 285 IP6STAT_INC(ip6s_odropped); 286 return (ENOBUFS); 287 } 288 m_cat(m, m_frgpart); 289 m->m_pkthdr.len = fraglen + hlen + sizeof(*ip6f); 290 ip6f->ip6f_reserved = 0; 291 ip6f->ip6f_ident = id; 292 ip6f->ip6f_nxt = nextproto; 293 IP6STAT_INC(ip6s_ofragments); 294 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 295 } 296 297 return (0); 298 } 299 300 static int 301 ip6_output_send(struct inpcb *inp, struct ifnet *ifp, struct ifnet *origifp, 302 struct mbuf *m, struct sockaddr_in6 *dst, struct route_in6 *ro, 303 bool stamp_tag) 304 { 305 #ifdef KERN_TLS 306 struct ktls_session *tls = NULL; 307 #endif 308 struct m_snd_tag *mst; 309 int error; 310 311 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 312 mst = NULL; 313 314 #ifdef KERN_TLS 315 /* 316 * If this is an unencrypted TLS record, save a reference to 317 * the record. This local reference is used to call 318 * ktls_output_eagain after the mbuf has been freed (thus 319 * dropping the mbuf's reference) in if_output. 320 */ 321 if (m->m_next != NULL && mbuf_has_tls_session(m->m_next)) { 322 tls = ktls_hold(m->m_next->m_epg_tls); 323 mst = tls->snd_tag; 324 325 /* 326 * If a TLS session doesn't have a valid tag, it must 327 * have had an earlier ifp mismatch, so drop this 328 * packet. 329 */ 330 if (mst == NULL) { 331 m_freem(m); 332 error = EAGAIN; 333 goto done; 334 } 335 /* 336 * Always stamp tags that include NIC ktls. 337 */ 338 stamp_tag = true; 339 } 340 #endif 341 #ifdef RATELIMIT 342 if (inp != NULL && mst == NULL) { 343 if ((inp->inp_flags2 & INP_RATE_LIMIT_CHANGED) != 0 || 344 (inp->inp_snd_tag != NULL && 345 inp->inp_snd_tag->ifp != ifp)) 346 in_pcboutput_txrtlmt(inp, ifp, m); 347 348 if (inp->inp_snd_tag != NULL) 349 mst = inp->inp_snd_tag; 350 } 351 #endif 352 if (stamp_tag && mst != NULL) { 353 KASSERT(m->m_pkthdr.rcvif == NULL, 354 ("trying to add a send tag to a forwarded packet")); 355 if (mst->ifp != ifp) { 356 m_freem(m); 357 error = EAGAIN; 358 goto done; 359 } 360 361 /* stamp send tag on mbuf */ 362 m->m_pkthdr.snd_tag = m_snd_tag_ref(mst); 363 m->m_pkthdr.csum_flags |= CSUM_SND_TAG; 364 } 365 366 error = nd6_output_ifp(ifp, origifp, m, dst, (struct route *)ro); 367 368 done: 369 /* Check for route change invalidating send tags. */ 370 #ifdef KERN_TLS 371 if (tls != NULL) { 372 if (error == EAGAIN) 373 error = ktls_output_eagain(inp, tls); 374 ktls_free(tls); 375 } 376 #endif 377 #ifdef RATELIMIT 378 if (error == EAGAIN) 379 in_pcboutput_eagain(inp); 380 #endif 381 return (error); 382 } 383 384 /* 385 * IP6 output. 386 * The packet in mbuf chain m contains a skeletal IP6 header (with pri, len, 387 * nxt, hlim, src, dst). 388 * This function may modify ver and hlim only. 389 * The mbuf chain containing the packet will be freed. 390 * The mbuf opt, if present, will not be freed. 391 * If route_in6 ro is present and has ro_nh initialized, route lookup would be 392 * skipped and ro->ro_nh would be used. If ro is present but ro->ro_nh is NULL, 393 * then result of route lookup is stored in ro->ro_nh. 394 * 395 * Type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and nd_ifinfo.linkmtu 396 * is uint32_t. So we use u_long to hold largest one, which is rt_mtu. 397 * 398 * ifpp - XXX: just for statistics 399 */ 400 int 401 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 402 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 403 struct ifnet **ifpp, struct inpcb *inp) 404 { 405 struct ip6_hdr *ip6; 406 struct ifnet *ifp, *origifp; 407 struct mbuf *m = m0; 408 struct mbuf *mprev; 409 struct route_in6 *ro_pmtu; 410 struct nhop_object *nh; 411 struct sockaddr_in6 *dst, sin6, src_sa, dst_sa; 412 struct in6_addr odst; 413 u_char *nexthdrp; 414 int tlen, len; 415 int error = 0; 416 int vlan_pcp = -1; 417 struct in6_ifaddr *ia = NULL; 418 u_long mtu; 419 int dontfrag; 420 u_int32_t optlen, plen = 0, unfragpartlen; 421 struct ip6_exthdrs exthdrs; 422 struct in6_addr src0, dst0; 423 u_int32_t zone; 424 bool hdrsplit; 425 int sw_csum, tso; 426 int needfiblookup; 427 uint32_t fibnum; 428 struct m_tag *fwd_tag = NULL; 429 uint32_t id; 430 uint32_t optvalid; 431 432 NET_EPOCH_ASSERT(); 433 434 if (inp != NULL) { 435 INP_LOCK_ASSERT(inp); 436 M_SETFIB(m, inp->inp_inc.inc_fibnum); 437 if ((flags & IP_NODEFAULTFLOWID) == 0) { 438 /* Unconditionally set flowid. */ 439 m->m_pkthdr.flowid = inp->inp_flowid; 440 M_HASHTYPE_SET(m, inp->inp_flowtype); 441 } 442 if ((inp->inp_flags2 & INP_2PCP_SET) != 0) 443 vlan_pcp = (inp->inp_flags2 & INP_2PCP_MASK) >> 444 INP_2PCP_SHIFT; 445 #ifdef NUMA 446 m->m_pkthdr.numa_domain = inp->inp_numa_domain; 447 #endif 448 } 449 450 /* Source address validation. */ 451 ip6 = mtod(m, struct ip6_hdr *); 452 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 453 (flags & IPV6_UNSPECSRC) == 0) { 454 error = EOPNOTSUPP; 455 IP6STAT_INC(ip6s_badscope); 456 goto bad; 457 } 458 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 459 error = EOPNOTSUPP; 460 IP6STAT_INC(ip6s_badscope); 461 goto bad; 462 } 463 464 /* 465 * If we are given packet options to add extension headers prepare them. 466 * Calculate the total length of the extension header chain. 467 * Keep the length of the unfragmentable part for fragmentation. 468 */ 469 bzero(&exthdrs, sizeof(exthdrs)); 470 optlen = optvalid = 0; 471 unfragpartlen = sizeof(struct ip6_hdr); 472 if (opt) { 473 optvalid = opt->ip6po_valid; 474 475 /* Hop-by-Hop options header. */ 476 if ((optvalid & IP6PO_VALID_HBH) != 0) 477 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh, optlen); 478 479 /* Destination options header (1st part). */ 480 if ((optvalid & IP6PO_VALID_RHINFO) != 0) { 481 #ifndef RTHDR_SUPPORT_IMPLEMENTED 482 /* 483 * If there is a routing header, discard the packet 484 * right away here. RH0/1 are obsolete and we do not 485 * currently support RH2/3/4. 486 * People trying to use RH253/254 may want to disable 487 * this check. 488 * The moment we do support any routing header (again) 489 * this block should check the routing type more 490 * selectively. 491 */ 492 error = EINVAL; 493 goto bad; 494 #endif 495 496 /* 497 * Destination options header (1st part). 498 * This only makes sense with a routing header. 499 * See Section 9.2 of RFC 3542. 500 * Disabling this part just for MIP6 convenience is 501 * a bad idea. We need to think carefully about a 502 * way to make the advanced API coexist with MIP6 503 * options, which might automatically be inserted in 504 * the kernel. 505 */ 506 if ((optvalid & IP6PO_VALID_DEST1) != 0) 507 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1, 508 optlen); 509 } 510 /* Routing header. */ 511 if ((optvalid & IP6PO_VALID_RHINFO) != 0) 512 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr, optlen); 513 514 unfragpartlen += optlen; 515 516 /* 517 * NOTE: we don't add AH/ESP length here (done in 518 * ip6_ipsec_output()). 519 */ 520 521 /* Destination options header (2nd part). */ 522 if ((optvalid & IP6PO_VALID_DEST2) != 0) 523 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2, optlen); 524 } 525 526 /* 527 * If there is at least one extension header, 528 * separate IP6 header from the payload. 529 */ 530 hdrsplit = false; 531 if (optlen) { 532 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 533 m = NULL; 534 goto freehdrs; 535 } 536 m = exthdrs.ip6e_ip6; 537 ip6 = mtod(m, struct ip6_hdr *); 538 hdrsplit = true; 539 } 540 541 /* Adjust mbuf packet header length. */ 542 m->m_pkthdr.len += optlen; 543 plen = m->m_pkthdr.len - sizeof(*ip6); 544 545 if (plen > IPV6_MAXPACKET) { 546 error = EMSGSIZE; 547 goto freehdrs; 548 } else 549 ip6->ip6_plen = htons(plen); 550 nexthdrp = &ip6->ip6_nxt; 551 552 if (optlen) { 553 /* 554 * Concatenate headers and fill in next header fields. 555 * Here we have, on "m" 556 * IPv6 payload 557 * and we insert headers accordingly. 558 * Finally, we should be getting: 559 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload]. 560 * 561 * During the header composing process "m" points to IPv6 562 * header. "mprev" points to an extension header prior to esp. 563 */ 564 mprev = m; 565 566 /* 567 * We treat dest2 specially. This makes IPsec processing 568 * much easier. The goal here is to make mprev point the 569 * mbuf prior to dest2. 570 * 571 * Result: IPv6 dest2 payload. 572 * m and mprev will point to IPv6 header. 573 */ 574 if (exthdrs.ip6e_dest2) { 575 if (!hdrsplit) 576 panic("%s:%d: assumption failed: " 577 "hdr not split: hdrsplit %d exthdrs %p", 578 __func__, __LINE__, hdrsplit, &exthdrs); 579 exthdrs.ip6e_dest2->m_next = m->m_next; 580 m->m_next = exthdrs.ip6e_dest2; 581 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 582 ip6->ip6_nxt = IPPROTO_DSTOPTS; 583 } 584 585 /* 586 * Result: IPv6 hbh dest1 rthdr dest2 payload. 587 * m will point to IPv6 header. mprev will point to the 588 * extension header prior to dest2 (rthdr in the above case). 589 */ 590 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 591 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 592 IPPROTO_DSTOPTS); 593 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 594 IPPROTO_ROUTING); 595 } 596 597 IP6STAT_INC(ip6s_localout); 598 599 /* Route packet. */ 600 ro_pmtu = ro; 601 if ((optvalid & IP6PO_VALID_RHINFO) != 0) 602 ro = &opt->ip6po_route; 603 if (ro != NULL) 604 dst = (struct sockaddr_in6 *)&ro->ro_dst; 605 else 606 dst = &sin6; 607 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 608 609 again: 610 /* 611 * If specified, try to fill in the traffic class field. 612 * Do not override if a non-zero value is already set. 613 * We check the diffserv field and the ECN field separately. 614 */ 615 if ((optvalid & IP6PO_VALID_TC) != 0){ 616 int mask = 0; 617 618 if (IPV6_DSCP(ip6) == 0) 619 mask |= 0xfc; 620 if (IPV6_ECN(ip6) == 0) 621 mask |= 0x03; 622 if (mask != 0) 623 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 624 } 625 626 /* Fill in or override the hop limit field, if necessary. */ 627 if ((optvalid & IP6PO_VALID_HLIM) != 0) 628 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 629 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 630 if (im6o != NULL) 631 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 632 else 633 ip6->ip6_hlim = V_ip6_defmcasthlim; 634 } 635 636 if (ro == NULL || ro->ro_nh == NULL) { 637 bzero(dst, sizeof(*dst)); 638 dst->sin6_family = AF_INET6; 639 dst->sin6_len = sizeof(*dst); 640 dst->sin6_addr = ip6->ip6_dst; 641 } 642 /* 643 * Validate route against routing table changes. 644 * Make sure that the address family is set in route. 645 */ 646 nh = NULL; 647 ifp = NULL; 648 mtu = 0; 649 if (ro != NULL) { 650 if (ro->ro_nh != NULL && inp != NULL) { 651 ro->ro_dst.sin6_family = AF_INET6; /* XXX KASSERT? */ 652 NH_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, 653 fibnum); 654 } 655 if (ro->ro_nh != NULL && fwd_tag == NULL && 656 (!NH_IS_VALID(ro->ro_nh) || 657 ro->ro_dst.sin6_family != AF_INET6 || 658 !IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst))) 659 RO_INVALIDATE_CACHE(ro); 660 661 if (ro->ro_nh != NULL && fwd_tag == NULL && 662 ro->ro_dst.sin6_family == AF_INET6 && 663 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) { 664 /* Nexthop is valid and contains valid ifp */ 665 nh = ro->ro_nh; 666 } else { 667 if (ro->ro_lle) 668 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 669 ro->ro_lle = NULL; 670 if (fwd_tag == NULL) { 671 bzero(&dst_sa, sizeof(dst_sa)); 672 dst_sa.sin6_family = AF_INET6; 673 dst_sa.sin6_len = sizeof(dst_sa); 674 dst_sa.sin6_addr = ip6->ip6_dst; 675 } 676 error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp, 677 &nh, fibnum, m->m_pkthdr.flowid); 678 if (error != 0) { 679 IP6STAT_INC(ip6s_noroute); 680 if (ifp != NULL) 681 in6_ifstat_inc(ifp, ifs6_out_discard); 682 goto bad; 683 } 684 /* 685 * At this point at least @ifp is not NULL 686 * Can be the case when dst is multicast, link-local or 687 * interface is explicitly specificed by the caller. 688 */ 689 } 690 if (nh == NULL) { 691 /* 692 * If in6_selectroute() does not return a nexthop 693 * dst may not have been updated. 694 */ 695 *dst = dst_sa; /* XXX */ 696 origifp = ifp; 697 mtu = ifp->if_mtu; 698 } else { 699 ifp = nh->nh_ifp; 700 origifp = nh->nh_aifp; 701 ia = (struct in6_ifaddr *)(nh->nh_ifa); 702 counter_u64_add(nh->nh_pksent, 1); 703 } 704 } else { 705 struct nhop_object *nh; 706 struct in6_addr kdst; 707 uint32_t scopeid; 708 709 if (fwd_tag == NULL) { 710 bzero(&dst_sa, sizeof(dst_sa)); 711 dst_sa.sin6_family = AF_INET6; 712 dst_sa.sin6_len = sizeof(dst_sa); 713 dst_sa.sin6_addr = ip6->ip6_dst; 714 } 715 716 if (IN6_IS_ADDR_MULTICAST(&dst_sa.sin6_addr) && 717 im6o != NULL && 718 (ifp = im6o->im6o_multicast_ifp) != NULL) { 719 /* We do not need a route lookup. */ 720 *dst = dst_sa; /* XXX */ 721 origifp = ifp; 722 goto nonh6lookup; 723 } 724 725 in6_splitscope(&dst_sa.sin6_addr, &kdst, &scopeid); 726 727 if (IN6_IS_ADDR_MC_LINKLOCAL(&dst_sa.sin6_addr) || 728 IN6_IS_ADDR_MC_NODELOCAL(&dst_sa.sin6_addr)) { 729 if (scopeid > 0) { 730 ifp = in6_getlinkifnet(scopeid); 731 if (ifp == NULL) { 732 error = EHOSTUNREACH; 733 goto bad; 734 } 735 *dst = dst_sa; /* XXX */ 736 origifp = ifp; 737 goto nonh6lookup; 738 } 739 } 740 741 nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 742 m->m_pkthdr.flowid); 743 if (nh == NULL) { 744 IP6STAT_INC(ip6s_noroute); 745 /* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */ 746 error = EHOSTUNREACH; 747 goto bad; 748 } 749 750 ifp = nh->nh_ifp; 751 origifp = nh->nh_aifp; 752 ia = ifatoia6(nh->nh_ifa); 753 if (nh->nh_flags & NHF_GATEWAY) 754 dst->sin6_addr = nh->gw6_sa.sin6_addr; 755 else if (fwd_tag != NULL) 756 dst->sin6_addr = dst_sa.sin6_addr; 757 nonh6lookup: 758 ; 759 } 760 /* 761 * At this point ifp MUST be pointing to the valid transmit ifp. 762 * origifp MUST be valid and pointing to either the same ifp or, 763 * in case of loopback output, to the interface which ip6_src 764 * belongs to. 765 * Examples: 766 * fe80::1%em0 -> fe80::2%em0 -> ifp=em0, origifp=em0 767 * fe80::1%em0 -> fe80::1%em0 -> ifp=lo0, origifp=em0 768 * ::1 -> ::1 -> ifp=lo0, origifp=lo0 769 * 770 * mtu can be 0 and will be refined later. 771 */ 772 KASSERT((ifp != NULL), ("output interface must not be NULL")); 773 KASSERT((origifp != NULL), ("output address interface must not be NULL")); 774 775 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 776 /* 777 * IPSec checking which handles several cases. 778 * FAST IPSEC: We re-injected the packet. 779 * XXX: need scope argument. 780 */ 781 if (IPSEC_ENABLED(ipv6)) { 782 if ((error = IPSEC_OUTPUT(ipv6, ifp, m, inp, mtu == 0 ? 783 ifp->if_mtu : mtu)) != 0) { 784 if (error == EINPROGRESS) 785 error = 0; 786 goto done; 787 } 788 } 789 #endif /* IPSEC */ 790 791 if ((flags & IPV6_FORWARDING) == 0) { 792 /* XXX: the FORWARDING flag can be set for mrouting. */ 793 in6_ifstat_inc(ifp, ifs6_out_request); 794 } 795 796 /* Setup data structures for scope ID checks. */ 797 src0 = ip6->ip6_src; 798 bzero(&src_sa, sizeof(src_sa)); 799 src_sa.sin6_family = AF_INET6; 800 src_sa.sin6_len = sizeof(src_sa); 801 src_sa.sin6_addr = ip6->ip6_src; 802 803 dst0 = ip6->ip6_dst; 804 /* Re-initialize to be sure. */ 805 bzero(&dst_sa, sizeof(dst_sa)); 806 dst_sa.sin6_family = AF_INET6; 807 dst_sa.sin6_len = sizeof(dst_sa); 808 dst_sa.sin6_addr = ip6->ip6_dst; 809 810 /* Check for valid scope ID. */ 811 if (in6_setscope(&src0, origifp, &zone) == 0 && 812 sa6_recoverscope(&src_sa) == 0 && zone == src_sa.sin6_scope_id && 813 in6_setscope(&dst0, origifp, &zone) == 0 && 814 sa6_recoverscope(&dst_sa) == 0 && zone == dst_sa.sin6_scope_id) { 815 /* 816 * The outgoing interface is in the zone of the source 817 * and destination addresses. 818 * 819 */ 820 } else if ((origifp->if_flags & IFF_LOOPBACK) == 0 || 821 sa6_recoverscope(&src_sa) != 0 || 822 sa6_recoverscope(&dst_sa) != 0 || 823 dst_sa.sin6_scope_id == 0 || 824 (src_sa.sin6_scope_id != 0 && 825 src_sa.sin6_scope_id != dst_sa.sin6_scope_id) || 826 ifnet_byindex(dst_sa.sin6_scope_id) == NULL) { 827 /* 828 * If the destination network interface is not a 829 * loopback interface, or the destination network 830 * address has no scope ID, or the source address has 831 * a scope ID set which is different from the 832 * destination address one, or there is no network 833 * interface representing this scope ID, the address 834 * pair is considered invalid. 835 */ 836 IP6STAT_INC(ip6s_badscope); 837 in6_ifstat_inc(origifp, ifs6_out_discard); 838 if (error == 0) 839 error = EHOSTUNREACH; /* XXX */ 840 goto bad; 841 } 842 /* All scope ID checks are successful. */ 843 844 if (nh && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 845 if ((optvalid & IP6PO_VALID_NHINFO) != 0) { 846 /* 847 * The nexthop is explicitly specified by the 848 * application. We assume the next hop is an IPv6 849 * address. 850 */ 851 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 852 } 853 else if ((nh->nh_flags & NHF_GATEWAY)) 854 dst = &nh->gw6_sa; 855 } 856 857 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 858 m->m_flags &= ~(M_BCAST | M_MCAST); /* Just in case. */ 859 } else { 860 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 861 in6_ifstat_inc(ifp, ifs6_out_mcast); 862 863 /* Confirm that the outgoing interface supports multicast. */ 864 if (!(ifp->if_flags & IFF_MULTICAST)) { 865 IP6STAT_INC(ip6s_noroute); 866 in6_ifstat_inc(ifp, ifs6_out_discard); 867 error = ENETUNREACH; 868 goto bad; 869 } 870 if ((im6o == NULL && in6_mcast_loop) || 871 (im6o && im6o->im6o_multicast_loop)) { 872 /* 873 * Loop back multicast datagram if not expressly 874 * forbidden to do so, even if we have not joined 875 * the address; protocols will filter it later, 876 * thus deferring a hash lookup and lock acquisition 877 * at the expense of an m_copym(). 878 */ 879 ip6_mloopback(ifp, m); 880 } else { 881 /* 882 * If we are acting as a multicast router, perform 883 * multicast forwarding as if the packet had just 884 * arrived on the interface to which we are about 885 * to send. The multicast forwarding function 886 * recursively calls this function, using the 887 * IPV6_FORWARDING flag to prevent infinite recursion. 888 * 889 * Multicasts that are looped back by ip6_mloopback(), 890 * above, will be forwarded by the ip6_input() routine, 891 * if necessary. 892 */ 893 if (V_ip6_mrouter && (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 if (inp->inp_flags & INP_DROPPED) { 1702 INP_WUNLOCK(inp); 1703 return (ECONNRESET); 1704 } 1705 optp = &inp->in6p_outputopts; 1706 error = ip6_pcbopt(IPV6_HOPLIMIT, 1707 (u_char *)&optval, sizeof(optval), 1708 optp, (td != NULL) ? td->td_ucred : 1709 NULL, uproto); 1710 INP_WUNLOCK(inp); 1711 break; 1712 } 1713 1714 case IPV6_RECVHOPLIMIT: 1715 OPTSET2292_EXCLUSIVE(IN6P_HOPLIMIT); 1716 break; 1717 1718 case IPV6_RECVHOPOPTS: 1719 OPTSET2292_EXCLUSIVE(IN6P_HOPOPTS); 1720 break; 1721 1722 case IPV6_RECVDSTOPTS: 1723 OPTSET2292_EXCLUSIVE(IN6P_DSTOPTS); 1724 break; 1725 1726 case IPV6_RECVRTHDRDSTOPTS: 1727 OPTSET2292_EXCLUSIVE(IN6P_RTHDRDSTOPTS); 1728 break; 1729 1730 case IPV6_RECVRTHDR: 1731 OPTSET2292_EXCLUSIVE(IN6P_RTHDR); 1732 break; 1733 1734 case IPV6_RECVPATHMTU: 1735 /* 1736 * We ignore this option for TCP 1737 * sockets. 1738 * (RFC3542 leaves this case 1739 * unspecified.) 1740 */ 1741 if (uproto != IPPROTO_TCP) 1742 OPTSET(IN6P_MTU); 1743 break; 1744 1745 case IPV6_RECVFLOWID: 1746 OPTSET2(INP_RECVFLOWID, optval); 1747 break; 1748 1749 #ifdef RSS 1750 case IPV6_RECVRSSBUCKETID: 1751 OPTSET2(INP_RECVRSSBUCKETID, optval); 1752 break; 1753 #endif 1754 1755 case IPV6_V6ONLY: 1756 INP_WLOCK(inp); 1757 if (inp->inp_lport || 1758 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 1759 /* 1760 * The socket is already bound. 1761 */ 1762 INP_WUNLOCK(inp); 1763 error = EINVAL; 1764 break; 1765 } 1766 if (optval) { 1767 inp->inp_flags |= IN6P_IPV6_V6ONLY; 1768 inp->inp_vflag &= ~INP_IPV4; 1769 } else { 1770 inp->inp_flags &= ~IN6P_IPV6_V6ONLY; 1771 inp->inp_vflag |= INP_IPV4; 1772 } 1773 INP_WUNLOCK(inp); 1774 break; 1775 case IPV6_RECVTCLASS: 1776 /* cannot mix with RFC2292 XXX */ 1777 OPTSET2292_EXCLUSIVE(IN6P_TCLASS); 1778 break; 1779 case IPV6_AUTOFLOWLABEL: 1780 OPTSET(IN6P_AUTOFLOWLABEL); 1781 break; 1782 1783 case IPV6_ORIGDSTADDR: 1784 OPTSET2(INP_ORIGDSTADDR, optval); 1785 break; 1786 case IPV6_BINDANY: 1787 OPTSET(INP_BINDANY); 1788 break; 1789 case IPV6_VLAN_PCP: 1790 if ((optval >= -1) && (optval <= 1791 (INP_2PCP_MASK >> INP_2PCP_SHIFT))) { 1792 if (optval == -1) { 1793 INP_WLOCK(inp); 1794 inp->inp_flags2 &= 1795 ~(INP_2PCP_SET | 1796 INP_2PCP_MASK); 1797 INP_WUNLOCK(inp); 1798 } else { 1799 INP_WLOCK(inp); 1800 inp->inp_flags2 |= 1801 INP_2PCP_SET; 1802 inp->inp_flags2 &= 1803 ~INP_2PCP_MASK; 1804 inp->inp_flags2 |= 1805 optval << 1806 INP_2PCP_SHIFT; 1807 INP_WUNLOCK(inp); 1808 } 1809 } else 1810 error = EINVAL; 1811 break; 1812 } 1813 break; 1814 1815 case IPV6_TCLASS: 1816 case IPV6_DONTFRAG: 1817 case IPV6_USE_MIN_MTU: 1818 case IPV6_PREFER_TEMPADDR: 1819 if (optlen != sizeof(optval)) { 1820 error = EINVAL; 1821 break; 1822 } 1823 error = sooptcopyin(sopt, &optval, 1824 sizeof optval, sizeof optval); 1825 if (error) 1826 break; 1827 { 1828 struct ip6_pktopts **optp; 1829 INP_WLOCK(inp); 1830 if (inp->inp_flags & INP_DROPPED) { 1831 INP_WUNLOCK(inp); 1832 return (ECONNRESET); 1833 } 1834 optp = &inp->in6p_outputopts; 1835 error = ip6_pcbopt(optname, 1836 (u_char *)&optval, sizeof(optval), 1837 optp, (td != NULL) ? td->td_ucred : 1838 NULL, uproto); 1839 INP_WUNLOCK(inp); 1840 break; 1841 } 1842 1843 case IPV6_2292PKTINFO: 1844 case IPV6_2292HOPLIMIT: 1845 case IPV6_2292HOPOPTS: 1846 case IPV6_2292DSTOPTS: 1847 case IPV6_2292RTHDR: 1848 /* RFC 2292 */ 1849 if (optlen != sizeof(int)) { 1850 error = EINVAL; 1851 break; 1852 } 1853 error = sooptcopyin(sopt, &optval, 1854 sizeof optval, sizeof optval); 1855 if (error) 1856 break; 1857 switch (optname) { 1858 case IPV6_2292PKTINFO: 1859 OPTSET2292(IN6P_PKTINFO); 1860 break; 1861 case IPV6_2292HOPLIMIT: 1862 OPTSET2292(IN6P_HOPLIMIT); 1863 break; 1864 case IPV6_2292HOPOPTS: 1865 /* 1866 * Check super-user privilege. 1867 * See comments for IPV6_RECVHOPOPTS. 1868 */ 1869 if (td != NULL) { 1870 error = priv_check(td, 1871 PRIV_NETINET_SETHDROPTS); 1872 if (error) 1873 return (error); 1874 } 1875 OPTSET2292(IN6P_HOPOPTS); 1876 break; 1877 case IPV6_2292DSTOPTS: 1878 if (td != NULL) { 1879 error = priv_check(td, 1880 PRIV_NETINET_SETHDROPTS); 1881 if (error) 1882 return (error); 1883 } 1884 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1885 break; 1886 case IPV6_2292RTHDR: 1887 OPTSET2292(IN6P_RTHDR); 1888 break; 1889 } 1890 break; 1891 case IPV6_PKTINFO: 1892 case IPV6_HOPOPTS: 1893 case IPV6_RTHDR: 1894 case IPV6_DSTOPTS: 1895 case IPV6_RTHDRDSTOPTS: 1896 case IPV6_NEXTHOP: 1897 { 1898 /* new advanced API (RFC3542) */ 1899 u_char *optbuf; 1900 u_char optbuf_storage[MCLBYTES]; 1901 int optlen; 1902 struct ip6_pktopts **optp; 1903 1904 /* cannot mix with RFC2292 */ 1905 if (OPTBIT(IN6P_RFC2292)) { 1906 error = EINVAL; 1907 break; 1908 } 1909 1910 /* 1911 * We only ensure valsize is not too large 1912 * here. Further validation will be done 1913 * later. 1914 */ 1915 error = sooptcopyin(sopt, optbuf_storage, 1916 sizeof(optbuf_storage), 0); 1917 if (error) 1918 break; 1919 optlen = sopt->sopt_valsize; 1920 optbuf = optbuf_storage; 1921 INP_WLOCK(inp); 1922 if (inp->inp_flags & INP_DROPPED) { 1923 INP_WUNLOCK(inp); 1924 return (ECONNRESET); 1925 } 1926 optp = &inp->in6p_outputopts; 1927 error = ip6_pcbopt(optname, optbuf, optlen, 1928 optp, (td != NULL) ? td->td_ucred : NULL, 1929 uproto); 1930 INP_WUNLOCK(inp); 1931 break; 1932 } 1933 #undef OPTSET 1934 1935 case IPV6_MULTICAST_IF: 1936 case IPV6_MULTICAST_HOPS: 1937 case IPV6_MULTICAST_LOOP: 1938 case IPV6_JOIN_GROUP: 1939 case IPV6_LEAVE_GROUP: 1940 case IPV6_MSFILTER: 1941 case MCAST_BLOCK_SOURCE: 1942 case MCAST_UNBLOCK_SOURCE: 1943 case MCAST_JOIN_GROUP: 1944 case MCAST_LEAVE_GROUP: 1945 case MCAST_JOIN_SOURCE_GROUP: 1946 case MCAST_LEAVE_SOURCE_GROUP: 1947 error = ip6_setmoptions(inp, sopt); 1948 break; 1949 1950 case IPV6_PORTRANGE: 1951 error = sooptcopyin(sopt, &optval, 1952 sizeof optval, sizeof optval); 1953 if (error) 1954 break; 1955 1956 INP_WLOCK(inp); 1957 switch (optval) { 1958 case IPV6_PORTRANGE_DEFAULT: 1959 inp->inp_flags &= ~(INP_LOWPORT); 1960 inp->inp_flags &= ~(INP_HIGHPORT); 1961 break; 1962 1963 case IPV6_PORTRANGE_HIGH: 1964 inp->inp_flags &= ~(INP_LOWPORT); 1965 inp->inp_flags |= INP_HIGHPORT; 1966 break; 1967 1968 case IPV6_PORTRANGE_LOW: 1969 inp->inp_flags &= ~(INP_HIGHPORT); 1970 inp->inp_flags |= INP_LOWPORT; 1971 break; 1972 1973 default: 1974 error = EINVAL; 1975 break; 1976 } 1977 INP_WUNLOCK(inp); 1978 break; 1979 1980 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1981 case IPV6_IPSEC_POLICY: 1982 if (IPSEC_ENABLED(ipv6)) { 1983 error = IPSEC_PCBCTL(ipv6, inp, sopt); 1984 break; 1985 } 1986 /* FALLTHROUGH */ 1987 #endif /* IPSEC */ 1988 1989 default: 1990 error = ENOPROTOOPT; 1991 break; 1992 } 1993 break; 1994 1995 case SOPT_GET: 1996 switch (optname) { 1997 case IPV6_2292PKTOPTIONS: 1998 #ifdef IPV6_PKTOPTIONS 1999 case IPV6_PKTOPTIONS: 2000 #endif 2001 /* 2002 * RFC3542 (effectively) deprecated the 2003 * semantics of the 2292-style pktoptions. 2004 * Since it was not reliable in nature (i.e., 2005 * applications had to expect the lack of some 2006 * information after all), it would make sense 2007 * to simplify this part by always returning 2008 * empty data. 2009 */ 2010 sopt->sopt_valsize = 0; 2011 break; 2012 2013 case IPV6_RECVHOPOPTS: 2014 case IPV6_RECVDSTOPTS: 2015 case IPV6_RECVRTHDRDSTOPTS: 2016 case IPV6_UNICAST_HOPS: 2017 case IPV6_RECVPKTINFO: 2018 case IPV6_RECVHOPLIMIT: 2019 case IPV6_RECVRTHDR: 2020 case IPV6_RECVPATHMTU: 2021 2022 case IPV6_V6ONLY: 2023 case IPV6_PORTRANGE: 2024 case IPV6_RECVTCLASS: 2025 case IPV6_AUTOFLOWLABEL: 2026 case IPV6_BINDANY: 2027 case IPV6_FLOWID: 2028 case IPV6_FLOWTYPE: 2029 case IPV6_RECVFLOWID: 2030 #ifdef RSS 2031 case IPV6_RSSBUCKETID: 2032 case IPV6_RECVRSSBUCKETID: 2033 #endif 2034 case IPV6_VLAN_PCP: 2035 switch (optname) { 2036 case IPV6_RECVHOPOPTS: 2037 optval = OPTBIT(IN6P_HOPOPTS); 2038 break; 2039 2040 case IPV6_RECVDSTOPTS: 2041 optval = OPTBIT(IN6P_DSTOPTS); 2042 break; 2043 2044 case IPV6_RECVRTHDRDSTOPTS: 2045 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 2046 break; 2047 2048 case IPV6_UNICAST_HOPS: 2049 optval = inp->in6p_hops; 2050 break; 2051 2052 case IPV6_RECVPKTINFO: 2053 optval = OPTBIT(IN6P_PKTINFO); 2054 break; 2055 2056 case IPV6_RECVHOPLIMIT: 2057 optval = OPTBIT(IN6P_HOPLIMIT); 2058 break; 2059 2060 case IPV6_RECVRTHDR: 2061 optval = OPTBIT(IN6P_RTHDR); 2062 break; 2063 2064 case IPV6_RECVPATHMTU: 2065 optval = OPTBIT(IN6P_MTU); 2066 break; 2067 2068 case IPV6_V6ONLY: 2069 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2070 break; 2071 2072 case IPV6_PORTRANGE: 2073 { 2074 int flags; 2075 flags = inp->inp_flags; 2076 if (flags & INP_HIGHPORT) 2077 optval = IPV6_PORTRANGE_HIGH; 2078 else if (flags & INP_LOWPORT) 2079 optval = IPV6_PORTRANGE_LOW; 2080 else 2081 optval = 0; 2082 break; 2083 } 2084 case IPV6_RECVTCLASS: 2085 optval = OPTBIT(IN6P_TCLASS); 2086 break; 2087 2088 case IPV6_AUTOFLOWLABEL: 2089 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2090 break; 2091 2092 case IPV6_ORIGDSTADDR: 2093 optval = OPTBIT2(INP_ORIGDSTADDR); 2094 break; 2095 2096 case IPV6_BINDANY: 2097 optval = OPTBIT(INP_BINDANY); 2098 break; 2099 2100 case IPV6_FLOWID: 2101 optval = inp->inp_flowid; 2102 break; 2103 2104 case IPV6_FLOWTYPE: 2105 optval = inp->inp_flowtype; 2106 break; 2107 2108 case IPV6_RECVFLOWID: 2109 optval = OPTBIT2(INP_RECVFLOWID); 2110 break; 2111 #ifdef RSS 2112 case IPV6_RSSBUCKETID: 2113 retval = 2114 rss_hash2bucket(inp->inp_flowid, 2115 inp->inp_flowtype, 2116 &rss_bucket); 2117 if (retval == 0) 2118 optval = rss_bucket; 2119 else 2120 error = EINVAL; 2121 break; 2122 2123 case IPV6_RECVRSSBUCKETID: 2124 optval = OPTBIT2(INP_RECVRSSBUCKETID); 2125 break; 2126 #endif 2127 2128 2129 case IPV6_VLAN_PCP: 2130 if (OPTBIT2(INP_2PCP_SET)) { 2131 optval = (inp->inp_flags2 & 2132 INP_2PCP_MASK) >> 2133 INP_2PCP_SHIFT; 2134 } else { 2135 optval = -1; 2136 } 2137 break; 2138 } 2139 2140 if (error) 2141 break; 2142 error = sooptcopyout(sopt, &optval, 2143 sizeof optval); 2144 break; 2145 2146 case IPV6_PATHMTU: 2147 { 2148 u_long pmtu = 0; 2149 struct ip6_mtuinfo mtuinfo; 2150 struct in6_addr addr; 2151 2152 if (!(so->so_state & SS_ISCONNECTED)) 2153 return (ENOTCONN); 2154 /* 2155 * XXX: we dot not consider the case of source 2156 * routing, or optional information to specify 2157 * the outgoing interface. 2158 * Copy faddr out of inp to avoid holding lock 2159 * on inp during route lookup. 2160 */ 2161 INP_RLOCK(inp); 2162 bcopy(&inp->in6p_faddr, &addr, sizeof(addr)); 2163 INP_RUNLOCK(inp); 2164 error = ip6_getpmtu_ctl(so->so_fibnum, 2165 &addr, &pmtu); 2166 if (error) 2167 break; 2168 if (pmtu > IPV6_MAXPACKET) 2169 pmtu = IPV6_MAXPACKET; 2170 2171 bzero(&mtuinfo, sizeof(mtuinfo)); 2172 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2173 optdata = (void *)&mtuinfo; 2174 optdatalen = sizeof(mtuinfo); 2175 error = sooptcopyout(sopt, optdata, 2176 optdatalen); 2177 break; 2178 } 2179 2180 case IPV6_2292PKTINFO: 2181 case IPV6_2292HOPLIMIT: 2182 case IPV6_2292HOPOPTS: 2183 case IPV6_2292RTHDR: 2184 case IPV6_2292DSTOPTS: 2185 switch (optname) { 2186 case IPV6_2292PKTINFO: 2187 optval = OPTBIT(IN6P_PKTINFO); 2188 break; 2189 case IPV6_2292HOPLIMIT: 2190 optval = OPTBIT(IN6P_HOPLIMIT); 2191 break; 2192 case IPV6_2292HOPOPTS: 2193 optval = OPTBIT(IN6P_HOPOPTS); 2194 break; 2195 case IPV6_2292RTHDR: 2196 optval = OPTBIT(IN6P_RTHDR); 2197 break; 2198 case IPV6_2292DSTOPTS: 2199 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2200 break; 2201 } 2202 error = sooptcopyout(sopt, &optval, 2203 sizeof optval); 2204 break; 2205 case IPV6_PKTINFO: 2206 case IPV6_HOPOPTS: 2207 case IPV6_RTHDR: 2208 case IPV6_DSTOPTS: 2209 case IPV6_RTHDRDSTOPTS: 2210 case IPV6_NEXTHOP: 2211 case IPV6_TCLASS: 2212 case IPV6_DONTFRAG: 2213 case IPV6_USE_MIN_MTU: 2214 case IPV6_PREFER_TEMPADDR: 2215 error = ip6_getpcbopt(inp, optname, sopt); 2216 break; 2217 2218 case IPV6_MULTICAST_IF: 2219 case IPV6_MULTICAST_HOPS: 2220 case IPV6_MULTICAST_LOOP: 2221 case IPV6_MSFILTER: 2222 error = ip6_getmoptions(inp, sopt); 2223 break; 2224 2225 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 2226 case IPV6_IPSEC_POLICY: 2227 if (IPSEC_ENABLED(ipv6)) { 2228 error = IPSEC_PCBCTL(ipv6, inp, sopt); 2229 break; 2230 } 2231 /* FALLTHROUGH */ 2232 #endif /* IPSEC */ 2233 default: 2234 error = ENOPROTOOPT; 2235 break; 2236 } 2237 break; 2238 } 2239 } 2240 return (error); 2241 } 2242 2243 int 2244 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2245 { 2246 int error = 0, optval, optlen; 2247 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2248 struct inpcb *inp = sotoinpcb(so); 2249 int level, op, optname; 2250 2251 level = sopt->sopt_level; 2252 op = sopt->sopt_dir; 2253 optname = sopt->sopt_name; 2254 optlen = sopt->sopt_valsize; 2255 2256 if (level != IPPROTO_IPV6) { 2257 return (EINVAL); 2258 } 2259 2260 switch (optname) { 2261 case IPV6_CHECKSUM: 2262 /* 2263 * For ICMPv6 sockets, no modification allowed for checksum 2264 * offset, permit "no change" values to help existing apps. 2265 * 2266 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2267 * for an ICMPv6 socket will fail." 2268 * The current behavior does not meet RFC3542. 2269 */ 2270 switch (op) { 2271 case SOPT_SET: 2272 if (optlen != sizeof(int)) { 2273 error = EINVAL; 2274 break; 2275 } 2276 error = sooptcopyin(sopt, &optval, sizeof(optval), 2277 sizeof(optval)); 2278 if (error) 2279 break; 2280 if (optval < -1 || (optval % 2) != 0) { 2281 /* 2282 * The API assumes non-negative even offset 2283 * values or -1 as a special value. 2284 */ 2285 error = EINVAL; 2286 } else if (inp->inp_ip_p == IPPROTO_ICMPV6) { 2287 if (optval != icmp6off) 2288 error = EINVAL; 2289 } else 2290 inp->in6p_cksum = optval; 2291 break; 2292 2293 case SOPT_GET: 2294 if (inp->inp_ip_p == IPPROTO_ICMPV6) 2295 optval = icmp6off; 2296 else 2297 optval = inp->in6p_cksum; 2298 2299 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2300 break; 2301 2302 default: 2303 error = EINVAL; 2304 break; 2305 } 2306 break; 2307 2308 default: 2309 error = ENOPROTOOPT; 2310 break; 2311 } 2312 2313 return (error); 2314 } 2315 2316 /* 2317 * Set up IP6 options in pcb for insertion in output packets or 2318 * specifying behavior of outgoing packets. 2319 */ 2320 static int 2321 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2322 struct socket *so, struct sockopt *sopt) 2323 { 2324 struct ip6_pktopts *opt = *pktopt; 2325 int error = 0; 2326 struct thread *td = sopt->sopt_td; 2327 struct epoch_tracker et; 2328 2329 /* turn off any old options. */ 2330 if (opt) { 2331 #ifdef DIAGNOSTIC 2332 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2333 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2334 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2335 printf("ip6_pcbopts: all specified options are cleared.\n"); 2336 #endif 2337 ip6_clearpktopts(opt, -1); 2338 } else { 2339 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2340 if (opt == NULL) 2341 return (ENOMEM); 2342 } 2343 *pktopt = NULL; 2344 2345 if (!m || m->m_len == 0) { 2346 /* 2347 * Only turning off any previous options, regardless of 2348 * whether the opt is just created or given. 2349 */ 2350 free(opt, M_IP6OPT); 2351 return (0); 2352 } 2353 2354 /* set options specified by user. */ 2355 NET_EPOCH_ENTER(et); 2356 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2357 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2358 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2359 free(opt, M_IP6OPT); 2360 NET_EPOCH_EXIT(et); 2361 return (error); 2362 } 2363 NET_EPOCH_EXIT(et); 2364 *pktopt = opt; 2365 return (0); 2366 } 2367 2368 /* 2369 * initialize ip6_pktopts. beware that there are non-zero default values in 2370 * the struct. 2371 */ 2372 void 2373 ip6_initpktopts(struct ip6_pktopts *opt) 2374 { 2375 2376 bzero(opt, sizeof(*opt)); 2377 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2378 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2379 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2380 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2381 } 2382 2383 static int 2384 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2385 struct ucred *cred, int uproto) 2386 { 2387 struct epoch_tracker et; 2388 struct ip6_pktopts *opt; 2389 int ret; 2390 2391 if (*pktopt == NULL) { 2392 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2393 M_NOWAIT); 2394 if (*pktopt == NULL) 2395 return (ENOBUFS); 2396 ip6_initpktopts(*pktopt); 2397 } 2398 opt = *pktopt; 2399 2400 NET_EPOCH_ENTER(et); 2401 ret = ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto); 2402 NET_EPOCH_EXIT(et); 2403 2404 return (ret); 2405 } 2406 2407 #define GET_PKTOPT_VAR(field, lenexpr) do { \ 2408 if (pktopt && pktopt->field) { \ 2409 INP_RUNLOCK(inp); \ 2410 optdata = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK); \ 2411 malloc_optdata = true; \ 2412 INP_RLOCK(inp); \ 2413 if (inp->inp_flags & INP_DROPPED) { \ 2414 INP_RUNLOCK(inp); \ 2415 free(optdata, M_TEMP); \ 2416 return (ECONNRESET); \ 2417 } \ 2418 pktopt = inp->in6p_outputopts; \ 2419 if (pktopt && pktopt->field) { \ 2420 optdatalen = min(lenexpr, sopt->sopt_valsize); \ 2421 bcopy(pktopt->field, optdata, optdatalen); \ 2422 } else { \ 2423 free(optdata, M_TEMP); \ 2424 optdata = NULL; \ 2425 malloc_optdata = false; \ 2426 } \ 2427 } \ 2428 } while(0) 2429 2430 #define GET_PKTOPT_EXT_HDR(field) GET_PKTOPT_VAR(field, \ 2431 (((struct ip6_ext *)pktopt->field)->ip6e_len + 1) << 3) 2432 2433 #define GET_PKTOPT_SOCKADDR(field) GET_PKTOPT_VAR(field, \ 2434 pktopt->field->sa_len) 2435 2436 static int 2437 ip6_getpcbopt(struct inpcb *inp, int optname, struct sockopt *sopt) 2438 { 2439 void *optdata = NULL; 2440 bool malloc_optdata = false; 2441 int optdatalen = 0; 2442 int error = 0; 2443 struct in6_pktinfo null_pktinfo; 2444 int deftclass = 0, on; 2445 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2446 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2447 struct ip6_pktopts *pktopt; 2448 2449 INP_RLOCK(inp); 2450 pktopt = inp->in6p_outputopts; 2451 2452 switch (optname) { 2453 case IPV6_PKTINFO: 2454 optdata = (void *)&null_pktinfo; 2455 if (pktopt && pktopt->ip6po_pktinfo) { 2456 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo, 2457 sizeof(null_pktinfo)); 2458 in6_clearscope(&null_pktinfo.ipi6_addr); 2459 } else { 2460 /* XXX: we don't have to do this every time... */ 2461 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2462 } 2463 optdatalen = sizeof(struct in6_pktinfo); 2464 break; 2465 case IPV6_TCLASS: 2466 if (pktopt && pktopt->ip6po_tclass >= 0) 2467 deftclass = pktopt->ip6po_tclass; 2468 optdata = (void *)&deftclass; 2469 optdatalen = sizeof(int); 2470 break; 2471 case IPV6_HOPOPTS: 2472 GET_PKTOPT_EXT_HDR(ip6po_hbh); 2473 break; 2474 case IPV6_RTHDR: 2475 GET_PKTOPT_EXT_HDR(ip6po_rthdr); 2476 break; 2477 case IPV6_RTHDRDSTOPTS: 2478 GET_PKTOPT_EXT_HDR(ip6po_dest1); 2479 break; 2480 case IPV6_DSTOPTS: 2481 GET_PKTOPT_EXT_HDR(ip6po_dest2); 2482 break; 2483 case IPV6_NEXTHOP: 2484 GET_PKTOPT_SOCKADDR(ip6po_nexthop); 2485 break; 2486 case IPV6_USE_MIN_MTU: 2487 if (pktopt) 2488 defminmtu = pktopt->ip6po_minmtu; 2489 optdata = (void *)&defminmtu; 2490 optdatalen = sizeof(int); 2491 break; 2492 case IPV6_DONTFRAG: 2493 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2494 on = 1; 2495 else 2496 on = 0; 2497 optdata = (void *)&on; 2498 optdatalen = sizeof(on); 2499 break; 2500 case IPV6_PREFER_TEMPADDR: 2501 if (pktopt) 2502 defpreftemp = pktopt->ip6po_prefer_tempaddr; 2503 optdata = (void *)&defpreftemp; 2504 optdatalen = sizeof(int); 2505 break; 2506 default: /* should not happen */ 2507 #ifdef DIAGNOSTIC 2508 panic("ip6_getpcbopt: unexpected option\n"); 2509 #endif 2510 INP_RUNLOCK(inp); 2511 return (ENOPROTOOPT); 2512 } 2513 INP_RUNLOCK(inp); 2514 2515 error = sooptcopyout(sopt, optdata, optdatalen); 2516 if (malloc_optdata) 2517 free(optdata, M_TEMP); 2518 2519 return (error); 2520 } 2521 2522 void 2523 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2524 { 2525 if (pktopt == NULL) 2526 return; 2527 2528 if (optname == -1 || optname == IPV6_PKTINFO) { 2529 if (pktopt->ip6po_pktinfo) 2530 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2531 pktopt->ip6po_pktinfo = NULL; 2532 } 2533 if (optname == -1 || optname == IPV6_HOPLIMIT) { 2534 pktopt->ip6po_hlim = -1; 2535 pktopt->ip6po_valid &= ~IP6PO_VALID_HLIM; 2536 } 2537 if (optname == -1 || optname == IPV6_TCLASS) { 2538 pktopt->ip6po_tclass = -1; 2539 pktopt->ip6po_valid &= ~IP6PO_VALID_TC; 2540 } 2541 if (optname == -1 || optname == IPV6_NEXTHOP) { 2542 if (pktopt->ip6po_nextroute.ro_nh) { 2543 NH_FREE(pktopt->ip6po_nextroute.ro_nh); 2544 pktopt->ip6po_nextroute.ro_nh = NULL; 2545 } 2546 if (pktopt->ip6po_nexthop) 2547 free(pktopt->ip6po_nexthop, M_IP6OPT); 2548 pktopt->ip6po_nexthop = NULL; 2549 pktopt->ip6po_valid &= ~IP6PO_VALID_NHINFO; 2550 } 2551 if (optname == -1 || optname == IPV6_HOPOPTS) { 2552 if (pktopt->ip6po_hbh) 2553 free(pktopt->ip6po_hbh, M_IP6OPT); 2554 pktopt->ip6po_hbh = NULL; 2555 pktopt->ip6po_valid &= ~IP6PO_VALID_HBH; 2556 } 2557 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2558 if (pktopt->ip6po_dest1) 2559 free(pktopt->ip6po_dest1, M_IP6OPT); 2560 pktopt->ip6po_dest1 = NULL; 2561 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST1; 2562 } 2563 if (optname == -1 || optname == IPV6_RTHDR) { 2564 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2565 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2566 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2567 if (pktopt->ip6po_route.ro_nh) { 2568 NH_FREE(pktopt->ip6po_route.ro_nh); 2569 pktopt->ip6po_route.ro_nh = NULL; 2570 } 2571 pktopt->ip6po_valid &= ~IP6PO_VALID_RHINFO; 2572 } 2573 if (optname == -1 || optname == IPV6_DSTOPTS) { 2574 if (pktopt->ip6po_dest2) 2575 free(pktopt->ip6po_dest2, M_IP6OPT); 2576 pktopt->ip6po_dest2 = NULL; 2577 pktopt->ip6po_valid &= ~IP6PO_VALID_DEST2; 2578 } 2579 } 2580 2581 #define PKTOPT_EXTHDRCPY(type) \ 2582 do {\ 2583 if (src->type) {\ 2584 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2585 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2586 if (dst->type == NULL)\ 2587 goto bad;\ 2588 bcopy(src->type, dst->type, hlen);\ 2589 }\ 2590 } while (/*CONSTCOND*/ 0) 2591 2592 static int 2593 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2594 { 2595 if (dst == NULL || src == NULL) { 2596 printf("ip6_clearpktopts: invalid argument\n"); 2597 return (EINVAL); 2598 } 2599 2600 dst->ip6po_hlim = src->ip6po_hlim; 2601 dst->ip6po_tclass = src->ip6po_tclass; 2602 dst->ip6po_flags = src->ip6po_flags; 2603 dst->ip6po_minmtu = src->ip6po_minmtu; 2604 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2605 if (src->ip6po_pktinfo) { 2606 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2607 M_IP6OPT, canwait); 2608 if (dst->ip6po_pktinfo == NULL) 2609 goto bad; 2610 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2611 } 2612 if (src->ip6po_nexthop) { 2613 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2614 M_IP6OPT, canwait); 2615 if (dst->ip6po_nexthop == NULL) 2616 goto bad; 2617 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2618 src->ip6po_nexthop->sa_len); 2619 } 2620 PKTOPT_EXTHDRCPY(ip6po_hbh); 2621 PKTOPT_EXTHDRCPY(ip6po_dest1); 2622 PKTOPT_EXTHDRCPY(ip6po_dest2); 2623 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2624 dst->ip6po_valid = src->ip6po_valid; 2625 return (0); 2626 2627 bad: 2628 ip6_clearpktopts(dst, -1); 2629 return (ENOBUFS); 2630 } 2631 #undef PKTOPT_EXTHDRCPY 2632 2633 struct ip6_pktopts * 2634 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2635 { 2636 int error; 2637 struct ip6_pktopts *dst; 2638 2639 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2640 if (dst == NULL) 2641 return (NULL); 2642 ip6_initpktopts(dst); 2643 2644 if ((error = copypktopts(dst, src, canwait)) != 0) { 2645 free(dst, M_IP6OPT); 2646 return (NULL); 2647 } 2648 2649 return (dst); 2650 } 2651 2652 void 2653 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2654 { 2655 if (pktopt == NULL) 2656 return; 2657 2658 ip6_clearpktopts(pktopt, -1); 2659 2660 free(pktopt, M_IP6OPT); 2661 } 2662 2663 /* 2664 * Set IPv6 outgoing packet options based on advanced API. 2665 */ 2666 int 2667 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2668 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2669 { 2670 struct cmsghdr *cm = NULL; 2671 2672 if (control == NULL || opt == NULL) 2673 return (EINVAL); 2674 2675 /* 2676 * ip6_setpktopt can call ifnet_byindex(), so it's imperative that we 2677 * are in the network epoch here. 2678 */ 2679 NET_EPOCH_ASSERT(); 2680 2681 ip6_initpktopts(opt); 2682 if (stickyopt) { 2683 int error; 2684 2685 /* 2686 * If stickyopt is provided, make a local copy of the options 2687 * for this particular packet, then override them by ancillary 2688 * objects. 2689 * XXX: copypktopts() does not copy the cached route to a next 2690 * hop (if any). This is not very good in terms of efficiency, 2691 * but we can allow this since this option should be rarely 2692 * used. 2693 */ 2694 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2695 return (error); 2696 } 2697 2698 /* 2699 * XXX: Currently, we assume all the optional information is stored 2700 * in a single mbuf. 2701 */ 2702 if (control->m_next) 2703 return (EINVAL); 2704 2705 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2706 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2707 int error; 2708 2709 if (control->m_len < CMSG_LEN(0)) 2710 return (EINVAL); 2711 2712 cm = mtod(control, struct cmsghdr *); 2713 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2714 return (EINVAL); 2715 if (cm->cmsg_level != IPPROTO_IPV6) 2716 continue; 2717 2718 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2719 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2720 if (error) 2721 return (error); 2722 } 2723 2724 return (0); 2725 } 2726 2727 /* 2728 * Set a particular packet option, as a sticky option or an ancillary data 2729 * item. "len" can be 0 only when it's a sticky option. 2730 * We have 4 cases of combination of "sticky" and "cmsg": 2731 * "sticky=0, cmsg=0": impossible 2732 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2733 * "sticky=1, cmsg=0": RFC3542 socket option 2734 * "sticky=1, cmsg=1": RFC2292 socket option 2735 */ 2736 static int 2737 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2738 struct ucred *cred, int sticky, int cmsg, int uproto) 2739 { 2740 int minmtupolicy, preftemp; 2741 int error; 2742 2743 NET_EPOCH_ASSERT(); 2744 2745 if (!sticky && !cmsg) { 2746 #ifdef DIAGNOSTIC 2747 printf("ip6_setpktopt: impossible case\n"); 2748 #endif 2749 return (EINVAL); 2750 } 2751 2752 /* 2753 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2754 * not be specified in the context of RFC3542. Conversely, 2755 * RFC3542 types should not be specified in the context of RFC2292. 2756 */ 2757 if (!cmsg) { 2758 switch (optname) { 2759 case IPV6_2292PKTINFO: 2760 case IPV6_2292HOPLIMIT: 2761 case IPV6_2292NEXTHOP: 2762 case IPV6_2292HOPOPTS: 2763 case IPV6_2292DSTOPTS: 2764 case IPV6_2292RTHDR: 2765 case IPV6_2292PKTOPTIONS: 2766 return (ENOPROTOOPT); 2767 } 2768 } 2769 if (sticky && cmsg) { 2770 switch (optname) { 2771 case IPV6_PKTINFO: 2772 case IPV6_HOPLIMIT: 2773 case IPV6_NEXTHOP: 2774 case IPV6_HOPOPTS: 2775 case IPV6_DSTOPTS: 2776 case IPV6_RTHDRDSTOPTS: 2777 case IPV6_RTHDR: 2778 case IPV6_USE_MIN_MTU: 2779 case IPV6_DONTFRAG: 2780 case IPV6_TCLASS: 2781 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2782 return (ENOPROTOOPT); 2783 } 2784 } 2785 2786 switch (optname) { 2787 case IPV6_2292PKTINFO: 2788 case IPV6_PKTINFO: 2789 { 2790 struct ifnet *ifp = NULL; 2791 struct in6_pktinfo *pktinfo; 2792 2793 if (len != sizeof(struct in6_pktinfo)) 2794 return (EINVAL); 2795 2796 pktinfo = (struct in6_pktinfo *)buf; 2797 2798 /* 2799 * An application can clear any sticky IPV6_PKTINFO option by 2800 * doing a "regular" setsockopt with ipi6_addr being 2801 * in6addr_any and ipi6_ifindex being zero. 2802 * [RFC 3542, Section 6] 2803 */ 2804 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2805 pktinfo->ipi6_ifindex == 0 && 2806 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2807 ip6_clearpktopts(opt, optname); 2808 break; 2809 } 2810 2811 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2812 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2813 return (EINVAL); 2814 } 2815 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) 2816 return (EINVAL); 2817 /* validate the interface index if specified. */ 2818 if (pktinfo->ipi6_ifindex) { 2819 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2820 if (ifp == NULL) 2821 return (ENXIO); 2822 } 2823 if (ifp != NULL && (ifp->if_inet6 == NULL || 2824 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED) != 0)) 2825 return (ENETDOWN); 2826 2827 if (ifp != NULL && 2828 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2829 struct in6_ifaddr *ia; 2830 2831 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL); 2832 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr); 2833 if (ia == NULL) 2834 return (EADDRNOTAVAIL); 2835 ifa_free(&ia->ia_ifa); 2836 } 2837 /* 2838 * We store the address anyway, and let in6_selectsrc() 2839 * validate the specified address. This is because ipi6_addr 2840 * may not have enough information about its scope zone, and 2841 * we may need additional information (such as outgoing 2842 * interface or the scope zone of a destination address) to 2843 * disambiguate the scope. 2844 * XXX: the delay of the validation may confuse the 2845 * application when it is used as a sticky option. 2846 */ 2847 if (opt->ip6po_pktinfo == NULL) { 2848 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2849 M_IP6OPT, M_NOWAIT); 2850 if (opt->ip6po_pktinfo == NULL) 2851 return (ENOBUFS); 2852 } 2853 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2854 opt->ip6po_valid |= IP6PO_VALID_PKTINFO; 2855 break; 2856 } 2857 2858 case IPV6_2292HOPLIMIT: 2859 case IPV6_HOPLIMIT: 2860 { 2861 int *hlimp; 2862 2863 /* 2864 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2865 * to simplify the ordering among hoplimit options. 2866 */ 2867 if (optname == IPV6_HOPLIMIT && sticky) 2868 return (ENOPROTOOPT); 2869 2870 if (len != sizeof(int)) 2871 return (EINVAL); 2872 hlimp = (int *)buf; 2873 if (*hlimp < -1 || *hlimp > 255) 2874 return (EINVAL); 2875 2876 opt->ip6po_hlim = *hlimp; 2877 opt->ip6po_valid |= IP6PO_VALID_HLIM; 2878 break; 2879 } 2880 2881 case IPV6_TCLASS: 2882 { 2883 int tclass; 2884 2885 if (len != sizeof(int)) 2886 return (EINVAL); 2887 tclass = *(int *)buf; 2888 if (tclass < -1 || tclass > 255) 2889 return (EINVAL); 2890 2891 opt->ip6po_tclass = tclass; 2892 opt->ip6po_valid |= IP6PO_VALID_TC; 2893 break; 2894 } 2895 2896 case IPV6_2292NEXTHOP: 2897 case IPV6_NEXTHOP: 2898 if (cred != NULL) { 2899 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2900 if (error) 2901 return (error); 2902 } 2903 2904 if (len == 0) { /* just remove the option */ 2905 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2906 break; 2907 } 2908 2909 /* check if cmsg_len is large enough for sa_len */ 2910 if (len < sizeof(struct sockaddr) || len < *buf) 2911 return (EINVAL); 2912 2913 switch (((struct sockaddr *)buf)->sa_family) { 2914 case AF_INET6: 2915 { 2916 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2917 int error; 2918 2919 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2920 return (EINVAL); 2921 2922 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2923 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2924 return (EINVAL); 2925 } 2926 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2927 != 0) { 2928 return (error); 2929 } 2930 break; 2931 } 2932 case AF_LINK: /* should eventually be supported */ 2933 default: 2934 return (EAFNOSUPPORT); 2935 } 2936 2937 /* turn off the previous option, then set the new option. */ 2938 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2939 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2940 if (opt->ip6po_nexthop == NULL) 2941 return (ENOBUFS); 2942 bcopy(buf, opt->ip6po_nexthop, *buf); 2943 opt->ip6po_valid |= IP6PO_VALID_NHINFO; 2944 break; 2945 2946 case IPV6_2292HOPOPTS: 2947 case IPV6_HOPOPTS: 2948 { 2949 struct ip6_hbh *hbh; 2950 int hbhlen; 2951 2952 /* 2953 * XXX: We don't allow a non-privileged user to set ANY HbH 2954 * options, since per-option restriction has too much 2955 * overhead. 2956 */ 2957 if (cred != NULL) { 2958 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2959 if (error) 2960 return (error); 2961 } 2962 2963 if (len == 0) { 2964 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2965 break; /* just remove the option */ 2966 } 2967 2968 /* message length validation */ 2969 if (len < sizeof(struct ip6_hbh)) 2970 return (EINVAL); 2971 hbh = (struct ip6_hbh *)buf; 2972 hbhlen = (hbh->ip6h_len + 1) << 3; 2973 if (len != hbhlen) 2974 return (EINVAL); 2975 2976 /* turn off the previous option, then set the new option. */ 2977 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2978 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2979 if (opt->ip6po_hbh == NULL) 2980 return (ENOBUFS); 2981 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2982 opt->ip6po_valid |= IP6PO_VALID_HBH; 2983 2984 break; 2985 } 2986 2987 case IPV6_2292DSTOPTS: 2988 case IPV6_DSTOPTS: 2989 case IPV6_RTHDRDSTOPTS: 2990 { 2991 struct ip6_dest *dest, **newdest = NULL; 2992 int destlen; 2993 2994 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2995 error = priv_check_cred(cred, PRIV_NETINET_SETHDROPTS); 2996 if (error) 2997 return (error); 2998 } 2999 3000 if (len == 0) { 3001 ip6_clearpktopts(opt, optname); 3002 break; /* just remove the option */ 3003 } 3004 3005 /* message length validation */ 3006 if (len < sizeof(struct ip6_dest)) 3007 return (EINVAL); 3008 dest = (struct ip6_dest *)buf; 3009 destlen = (dest->ip6d_len + 1) << 3; 3010 if (len != destlen) 3011 return (EINVAL); 3012 3013 /* 3014 * Determine the position that the destination options header 3015 * should be inserted; before or after the routing header. 3016 */ 3017 switch (optname) { 3018 case IPV6_2292DSTOPTS: 3019 /* 3020 * The old advacned API is ambiguous on this point. 3021 * Our approach is to determine the position based 3022 * according to the existence of a routing header. 3023 * Note, however, that this depends on the order of the 3024 * extension headers in the ancillary data; the 1st 3025 * part of the destination options header must appear 3026 * before the routing header in the ancillary data, 3027 * too. 3028 * RFC3542 solved the ambiguity by introducing 3029 * separate ancillary data or option types. 3030 */ 3031 if (opt->ip6po_rthdr == NULL) 3032 newdest = &opt->ip6po_dest1; 3033 else 3034 newdest = &opt->ip6po_dest2; 3035 break; 3036 case IPV6_RTHDRDSTOPTS: 3037 newdest = &opt->ip6po_dest1; 3038 break; 3039 case IPV6_DSTOPTS: 3040 newdest = &opt->ip6po_dest2; 3041 break; 3042 } 3043 3044 /* turn off the previous option, then set the new option. */ 3045 ip6_clearpktopts(opt, optname); 3046 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3047 if (*newdest == NULL) 3048 return (ENOBUFS); 3049 bcopy(dest, *newdest, destlen); 3050 if (newdest == &opt->ip6po_dest1) 3051 opt->ip6po_valid |= IP6PO_VALID_DEST1; 3052 else 3053 opt->ip6po_valid |= IP6PO_VALID_DEST2; 3054 3055 break; 3056 } 3057 3058 case IPV6_2292RTHDR: 3059 case IPV6_RTHDR: 3060 { 3061 struct ip6_rthdr *rth; 3062 int rthlen; 3063 3064 if (len == 0) { 3065 ip6_clearpktopts(opt, IPV6_RTHDR); 3066 break; /* just remove the option */ 3067 } 3068 3069 /* message length validation */ 3070 if (len < sizeof(struct ip6_rthdr)) 3071 return (EINVAL); 3072 rth = (struct ip6_rthdr *)buf; 3073 rthlen = (rth->ip6r_len + 1) << 3; 3074 if (len != rthlen) 3075 return (EINVAL); 3076 3077 switch (rth->ip6r_type) { 3078 case IPV6_RTHDR_TYPE_0: 3079 if (rth->ip6r_len == 0) /* must contain one addr */ 3080 return (EINVAL); 3081 if (rth->ip6r_len % 2) /* length must be even */ 3082 return (EINVAL); 3083 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3084 return (EINVAL); 3085 break; 3086 default: 3087 return (EINVAL); /* not supported */ 3088 } 3089 3090 /* turn off the previous option */ 3091 ip6_clearpktopts(opt, IPV6_RTHDR); 3092 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3093 if (opt->ip6po_rthdr == NULL) 3094 return (ENOBUFS); 3095 bcopy(rth, opt->ip6po_rthdr, rthlen); 3096 opt->ip6po_valid |= IP6PO_VALID_RHINFO; 3097 3098 break; 3099 } 3100 3101 case IPV6_USE_MIN_MTU: 3102 if (len != sizeof(int)) 3103 return (EINVAL); 3104 minmtupolicy = *(int *)buf; 3105 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3106 minmtupolicy != IP6PO_MINMTU_DISABLE && 3107 minmtupolicy != IP6PO_MINMTU_ALL) { 3108 return (EINVAL); 3109 } 3110 opt->ip6po_minmtu = minmtupolicy; 3111 break; 3112 3113 case IPV6_DONTFRAG: 3114 if (len != sizeof(int)) 3115 return (EINVAL); 3116 3117 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3118 /* 3119 * we ignore this option for TCP sockets. 3120 * (RFC3542 leaves this case unspecified.) 3121 */ 3122 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3123 } else 3124 opt->ip6po_flags |= IP6PO_DONTFRAG; 3125 break; 3126 3127 case IPV6_PREFER_TEMPADDR: 3128 if (len != sizeof(int)) 3129 return (EINVAL); 3130 preftemp = *(int *)buf; 3131 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3132 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3133 preftemp != IP6PO_TEMPADDR_PREFER) { 3134 return (EINVAL); 3135 } 3136 opt->ip6po_prefer_tempaddr = preftemp; 3137 break; 3138 3139 default: 3140 return (ENOPROTOOPT); 3141 } /* end of switch */ 3142 3143 return (0); 3144 } 3145 3146 /* 3147 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3148 * packet to the input queue of a specified interface. Note that this 3149 * calls the output routine of the loopback "driver", but with an interface 3150 * pointer that might NOT be &loif -- easier than replicating that code here. 3151 */ 3152 void 3153 ip6_mloopback(struct ifnet *ifp, struct mbuf *m) 3154 { 3155 struct mbuf *copym; 3156 struct ip6_hdr *ip6; 3157 3158 copym = m_copym(m, 0, M_COPYALL, M_NOWAIT); 3159 if (copym == NULL) 3160 return; 3161 3162 /* 3163 * Make sure to deep-copy IPv6 header portion in case the data 3164 * is in an mbuf cluster, so that we can safely override the IPv6 3165 * header portion later. 3166 */ 3167 if (!M_WRITABLE(copym) || 3168 copym->m_len < sizeof(struct ip6_hdr)) { 3169 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3170 if (copym == NULL) 3171 return; 3172 } 3173 ip6 = mtod(copym, struct ip6_hdr *); 3174 /* 3175 * clear embedded scope identifiers if necessary. 3176 * in6_clearscope will touch the addresses only when necessary. 3177 */ 3178 in6_clearscope(&ip6->ip6_src); 3179 in6_clearscope(&ip6->ip6_dst); 3180 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3181 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3182 CSUM_PSEUDO_HDR; 3183 copym->m_pkthdr.csum_data = 0xffff; 3184 } 3185 if_simloop(ifp, copym, AF_INET6, 0); 3186 } 3187 3188 /* 3189 * Chop IPv6 header off from the payload. 3190 */ 3191 static int 3192 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3193 { 3194 struct mbuf *mh; 3195 struct ip6_hdr *ip6; 3196 3197 ip6 = mtod(m, struct ip6_hdr *); 3198 if (m->m_len > sizeof(*ip6)) { 3199 mh = m_gethdr(M_NOWAIT, MT_DATA); 3200 if (mh == NULL) { 3201 m_freem(m); 3202 return ENOBUFS; 3203 } 3204 m_move_pkthdr(mh, m); 3205 M_ALIGN(mh, sizeof(*ip6)); 3206 m->m_len -= sizeof(*ip6); 3207 m->m_data += sizeof(*ip6); 3208 mh->m_next = m; 3209 m = mh; 3210 m->m_len = sizeof(*ip6); 3211 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3212 } 3213 exthdrs->ip6e_ip6 = m; 3214 return 0; 3215 } 3216 3217 /* 3218 * Compute IPv6 extension header length. 3219 */ 3220 int 3221 ip6_optlen(struct inpcb *inp) 3222 { 3223 int len; 3224 3225 if (!inp->in6p_outputopts) 3226 return 0; 3227 3228 len = 0; 3229 #define elen(x) \ 3230 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3231 3232 len += elen(inp->in6p_outputopts->ip6po_hbh); 3233 if (inp->in6p_outputopts->ip6po_rthdr) 3234 /* dest1 is valid with rthdr only */ 3235 len += elen(inp->in6p_outputopts->ip6po_dest1); 3236 len += elen(inp->in6p_outputopts->ip6po_rthdr); 3237 len += elen(inp->in6p_outputopts->ip6po_dest2); 3238 return len; 3239 #undef elen 3240 } 3241