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sys/netinet6/ip6_output.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD: releng/10.4/sys/netinet6/ip6_output.c 317335 2017-04-23 08:59:57Z kp $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipfw.h" 69 #include "opt_ipsec.h" 70 #include "opt_sctp.h" 71 #include "opt_route.h" 72 73 #include <sys/param.h> 74 #include <sys/kernel.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/errno.h> 78 #include <sys/priv.h> 79 #include <sys/proc.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/syslog.h> 84 #include <sys/ucred.h> 85 86 #include <machine/in_cksum.h> 87 88 #include <net/if.h> 89 #include <net/netisr.h> 90 #include <net/route.h> 91 #include <net/pfil.h> 92 #include <net/vnet.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #include <netinet/ip_var.h> 97 #include <netinet6/in6_var.h> 98 #include <netinet/ip6.h> 99 #include <netinet/icmp6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet/in_pcb.h> 102 #include <netinet/tcp_var.h> 103 #include <netinet6/nd6.h> 104 105 #ifdef IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec6.h> 108 #include <netipsec/key.h> 109 #include <netinet6/ip6_ipsec.h> 110 #endif /* IPSEC */ 111 #ifdef SCTP 112 #include <netinet/sctp.h> 113 #include <netinet/sctp_crc32.h> 114 #endif 115 116 #include <netinet6/ip6protosw.h> 117 #include <netinet6/scope6_var.h> 118 119 #ifdef FLOWTABLE 120 #include <net/flowtable.h> 121 #endif 122 123 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 int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *); 137 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int); 140 141 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146 static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int); 148 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 149 150 151 /* 152 * Make an extension header from option data. hp is the source, and 153 * mp is the destination. 154 */ 155 #define MAKE_EXTHDR(hp, mp) \ 156 do { \ 157 if (hp) { \ 158 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 159 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 160 ((eh)->ip6e_len + 1) << 3); \ 161 if (error) \ 162 goto freehdrs; \ 163 } \ 164 } while (/*CONSTCOND*/ 0) 165 166 /* 167 * Form a chain of extension headers. 168 * m is the extension header mbuf 169 * mp is the previous mbuf in the chain 170 * p is the next header 171 * i is the type of option. 172 */ 173 #define MAKE_CHAIN(m, mp, p, i)\ 174 do {\ 175 if (m) {\ 176 if (!hdrsplit) \ 177 panic("assumption failed: hdr not split"); \ 178 *mtod((m), u_char *) = *(p);\ 179 *(p) = (i);\ 180 p = mtod((m), u_char *);\ 181 (m)->m_next = (mp)->m_next;\ 182 (mp)->m_next = (m);\ 183 (mp) = (m);\ 184 }\ 185 } while (/*CONSTCOND*/ 0) 186 187 void 188 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 189 { 190 u_short csum; 191 192 csum = in_cksum_skip(m, offset + plen, offset); 193 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 194 csum = 0xffff; 195 offset += m->m_pkthdr.csum_data; /* checksum offset */ 196 197 if (offset + sizeof(u_short) > m->m_len) { 198 printf("%s: delayed m_pullup, m->len: %d plen %u off %u " 199 "csum_flags=%b\n", __func__, m->m_len, plen, offset, 200 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 201 /* 202 * XXX this should not happen, but if it does, the correct 203 * behavior may be to insert the checksum in the appropriate 204 * next mbuf in the chain. 205 */ 206 return; 207 } 208 *(u_short *)(m->m_data + offset) = csum; 209 } 210 211 int 212 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 213 int mtu, uint32_t id) 214 { 215 struct mbuf *m, **mnext, *m_frgpart; 216 struct ip6_hdr *ip6, *mhip6; 217 struct ip6_frag *ip6f; 218 int off; 219 int error; 220 int tlen = m0->m_pkthdr.len; 221 222 KASSERT(( mtu % 8 == 0), ("Fragment length must be a multiple of 8")); 223 224 m = m0; 225 ip6 = mtod(m, struct ip6_hdr *); 226 mnext = &m->m_nextpkt; 227 228 for (off = hlen; off < tlen; off += mtu) { 229 m = m_gethdr(M_NOWAIT, MT_DATA); 230 if (!m) { 231 IP6STAT_INC(ip6s_odropped); 232 return (ENOBUFS); 233 } 234 m->m_flags = m0->m_flags & M_COPYFLAGS; 235 *mnext = m; 236 mnext = &m->m_nextpkt; 237 m->m_data += max_linkhdr; 238 mhip6 = mtod(m, struct ip6_hdr *); 239 *mhip6 = *ip6; 240 m->m_len = sizeof(*mhip6); 241 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 242 if (error) { 243 IP6STAT_INC(ip6s_odropped); 244 return (error); 245 } 246 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 247 if (off + mtu >= tlen) 248 mtu = tlen - off; 249 else 250 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 251 mhip6->ip6_plen = htons((u_short)(mtu + hlen + 252 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 253 if ((m_frgpart = m_copy(m0, off, mtu)) == 0) { 254 IP6STAT_INC(ip6s_odropped); 255 return (ENOBUFS); 256 } 257 m_cat(m, m_frgpart); 258 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f); 259 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 260 m->m_pkthdr.rcvif = NULL; 261 ip6f->ip6f_reserved = 0; 262 ip6f->ip6f_ident = id; 263 ip6f->ip6f_nxt = nextproto; 264 IP6STAT_INC(ip6s_ofragments); 265 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 266 } 267 268 return (0); 269 } 270 271 /* 272 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 273 * header (with pri, len, nxt, hlim, src, dst). 274 * This function may modify ver and hlim only. 275 * The mbuf chain containing the packet will be freed. 276 * The mbuf opt, if present, will not be freed. 277 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 278 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 279 * then result of route lookup is stored in ro->ro_rt. 280 * 281 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 282 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 283 * which is rt_mtu. 284 * 285 * ifpp - XXX: just for statistics 286 */ 287 int 288 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 289 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 290 struct ifnet **ifpp, struct inpcb *inp) 291 { 292 struct ip6_hdr *ip6; 293 struct ifnet *ifp, *origifp; 294 struct mbuf *m = m0; 295 struct mbuf *mprev = NULL; 296 int hlen, tlen, len; 297 struct route_in6 ip6route; 298 struct rtentry *rt = NULL; 299 struct sockaddr_in6 *dst, src_sa, dst_sa; 300 struct in6_addr odst; 301 int error = 0; 302 struct in6_ifaddr *ia = NULL; 303 u_long mtu; 304 int alwaysfrag, dontfrag; 305 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 306 struct ip6_exthdrs exthdrs; 307 struct in6_addr finaldst, src0, dst0; 308 u_int32_t zone; 309 struct route_in6 *ro_pmtu = NULL; 310 int hdrsplit = 0; 311 int sw_csum, tso; 312 struct m_tag *fwd_tag = NULL; 313 uint32_t id; 314 315 ip6 = mtod(m, struct ip6_hdr *); 316 if (ip6 == NULL) { 317 printf ("ip6 is NULL"); 318 goto bad; 319 } 320 321 if (inp != NULL) 322 M_SETFIB(m, inp->inp_inc.inc_fibnum); 323 324 finaldst = ip6->ip6_dst; 325 bzero(&exthdrs, sizeof(exthdrs)); 326 if (opt) { 327 /* Hop-by-Hop options header */ 328 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 329 /* Destination options header(1st part) */ 330 if (opt->ip6po_rthdr) { 331 /* 332 * Destination options header(1st part) 333 * This only makes sense with a routing header. 334 * See Section 9.2 of RFC 3542. 335 * Disabling this part just for MIP6 convenience is 336 * a bad idea. We need to think carefully about a 337 * way to make the advanced API coexist with MIP6 338 * options, which might automatically be inserted in 339 * the kernel. 340 */ 341 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 342 } 343 /* Routing header */ 344 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 345 /* Destination options header(2nd part) */ 346 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 347 } 348 349 #ifdef IPSEC 350 /* 351 * IPSec checking which handles several cases. 352 * FAST IPSEC: We re-injected the packet. 353 */ 354 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp)) 355 { 356 case 1: /* Bad packet */ 357 goto freehdrs; 358 case -1: /* IPSec done */ 359 goto done; 360 case 0: /* No IPSec */ 361 default: 362 break; 363 } 364 #endif /* IPSEC */ 365 366 /* 367 * Calculate the total length of the extension header chain. 368 * Keep the length of the unfragmentable part for fragmentation. 369 */ 370 optlen = 0; 371 if (exthdrs.ip6e_hbh) 372 optlen += exthdrs.ip6e_hbh->m_len; 373 if (exthdrs.ip6e_dest1) 374 optlen += exthdrs.ip6e_dest1->m_len; 375 if (exthdrs.ip6e_rthdr) 376 optlen += exthdrs.ip6e_rthdr->m_len; 377 unfragpartlen = optlen + sizeof(struct ip6_hdr); 378 379 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 380 if (exthdrs.ip6e_dest2) 381 optlen += exthdrs.ip6e_dest2->m_len; 382 383 /* 384 * If there is at least one extension header, 385 * separate IP6 header from the payload. 386 */ 387 if (optlen && !hdrsplit) { 388 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 389 m = NULL; 390 goto freehdrs; 391 } 392 m = exthdrs.ip6e_ip6; 393 hdrsplit++; 394 } 395 396 /* adjust pointer */ 397 ip6 = mtod(m, struct ip6_hdr *); 398 399 /* adjust mbuf packet header length */ 400 m->m_pkthdr.len += optlen; 401 plen = m->m_pkthdr.len - sizeof(*ip6); 402 403 /* If this is a jumbo payload, insert a jumbo payload option. */ 404 if (plen > IPV6_MAXPACKET) { 405 if (!hdrsplit) { 406 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 407 m = NULL; 408 goto freehdrs; 409 } 410 m = exthdrs.ip6e_ip6; 411 hdrsplit++; 412 } 413 /* adjust pointer */ 414 ip6 = mtod(m, struct ip6_hdr *); 415 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 416 goto freehdrs; 417 ip6->ip6_plen = 0; 418 } else 419 ip6->ip6_plen = htons(plen); 420 421 /* 422 * Concatenate headers and fill in next header fields. 423 * Here we have, on "m" 424 * IPv6 payload 425 * and we insert headers accordingly. Finally, we should be getting: 426 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 427 * 428 * during the header composing process, "m" points to IPv6 header. 429 * "mprev" points to an extension header prior to esp. 430 */ 431 u_char *nexthdrp = &ip6->ip6_nxt; 432 mprev = m; 433 434 /* 435 * we treat dest2 specially. this makes IPsec processing 436 * much easier. the goal here is to make mprev point the 437 * mbuf prior to dest2. 438 * 439 * result: IPv6 dest2 payload 440 * m and mprev will point to IPv6 header. 441 */ 442 if (exthdrs.ip6e_dest2) { 443 if (!hdrsplit) 444 panic("assumption failed: hdr not split"); 445 exthdrs.ip6e_dest2->m_next = m->m_next; 446 m->m_next = exthdrs.ip6e_dest2; 447 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 448 ip6->ip6_nxt = IPPROTO_DSTOPTS; 449 } 450 451 /* 452 * result: IPv6 hbh dest1 rthdr dest2 payload 453 * m will point to IPv6 header. mprev will point to the 454 * extension header prior to dest2 (rthdr in the above case). 455 */ 456 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 457 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 458 IPPROTO_DSTOPTS); 459 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 460 IPPROTO_ROUTING); 461 462 /* 463 * If there is a routing header, discard the packet. 464 */ 465 if (exthdrs.ip6e_rthdr) { 466 error = EINVAL; 467 goto bad; 468 } 469 470 /* Source address validation */ 471 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 472 (flags & IPV6_UNSPECSRC) == 0) { 473 error = EOPNOTSUPP; 474 IP6STAT_INC(ip6s_badscope); 475 goto bad; 476 } 477 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 478 error = EOPNOTSUPP; 479 IP6STAT_INC(ip6s_badscope); 480 goto bad; 481 } 482 483 IP6STAT_INC(ip6s_localout); 484 485 /* 486 * Route packet. 487 */ 488 if (ro == 0) { 489 ro = &ip6route; 490 bzero((caddr_t)ro, sizeof(*ro)); 491 } 492 ro_pmtu = ro; 493 if (opt && opt->ip6po_rthdr) 494 ro = &opt->ip6po_route; 495 dst = (struct sockaddr_in6 *)&ro->ro_dst; 496 #ifdef FLOWTABLE 497 if (ro->ro_rt == NULL) 498 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 499 #endif 500 again: 501 /* 502 * if specified, try to fill in the traffic class field. 503 * do not override if a non-zero value is already set. 504 * we check the diffserv field and the ecn field separately. 505 */ 506 if (opt && opt->ip6po_tclass >= 0) { 507 int mask = 0; 508 509 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 510 mask |= 0xfc; 511 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 512 mask |= 0x03; 513 if (mask != 0) 514 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 515 } 516 517 /* fill in or override the hop limit field, if necessary. */ 518 if (opt && opt->ip6po_hlim != -1) 519 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 520 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 521 if (im6o != NULL) 522 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 523 else 524 ip6->ip6_hlim = V_ip6_defmcasthlim; 525 } 526 527 /* adjust pointer */ 528 ip6 = mtod(m, struct ip6_hdr *); 529 530 if (ro->ro_rt && fwd_tag == NULL) { 531 rt = ro->ro_rt; 532 ifp = ro->ro_rt->rt_ifp; 533 } else { 534 if (fwd_tag == NULL) { 535 bzero(&dst_sa, sizeof(dst_sa)); 536 dst_sa.sin6_family = AF_INET6; 537 dst_sa.sin6_len = sizeof(dst_sa); 538 dst_sa.sin6_addr = ip6->ip6_dst; 539 } 540 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 541 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 542 if (error != 0) { 543 if (ifp != NULL) 544 in6_ifstat_inc(ifp, ifs6_out_discard); 545 goto bad; 546 } 547 } 548 if (rt == NULL) { 549 /* 550 * If in6_selectroute() does not return a route entry, 551 * dst may not have been updated. 552 */ 553 *dst = dst_sa; /* XXX */ 554 } 555 556 /* 557 * then rt (for unicast) and ifp must be non-NULL valid values. 558 */ 559 if ((flags & IPV6_FORWARDING) == 0) { 560 /* XXX: the FORWARDING flag can be set for mrouting. */ 561 in6_ifstat_inc(ifp, ifs6_out_request); 562 } 563 if (rt != NULL) { 564 ia = (struct in6_ifaddr *)(rt->rt_ifa); 565 counter_u64_add(rt->rt_pksent, 1); 566 } 567 568 569 /* 570 * The outgoing interface must be in the zone of source and 571 * destination addresses. 572 */ 573 origifp = ifp; 574 575 src0 = ip6->ip6_src; 576 if (in6_setscope(&src0, origifp, &zone)) 577 goto badscope; 578 bzero(&src_sa, sizeof(src_sa)); 579 src_sa.sin6_family = AF_INET6; 580 src_sa.sin6_len = sizeof(src_sa); 581 src_sa.sin6_addr = ip6->ip6_src; 582 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 583 goto badscope; 584 585 dst0 = ip6->ip6_dst; 586 if (in6_setscope(&dst0, origifp, &zone)) 587 goto badscope; 588 /* re-initialize to be sure */ 589 bzero(&dst_sa, sizeof(dst_sa)); 590 dst_sa.sin6_family = AF_INET6; 591 dst_sa.sin6_len = sizeof(dst_sa); 592 dst_sa.sin6_addr = ip6->ip6_dst; 593 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 594 goto badscope; 595 } 596 597 /* We should use ia_ifp to support the case of 598 * sending packets to an address of our own. 599 */ 600 if (ia != NULL && ia->ia_ifp) 601 ifp = ia->ia_ifp; 602 603 /* scope check is done. */ 604 goto routefound; 605 606 badscope: 607 IP6STAT_INC(ip6s_badscope); 608 in6_ifstat_inc(origifp, ifs6_out_discard); 609 if (error == 0) 610 error = EHOSTUNREACH; /* XXX */ 611 goto bad; 612 613 routefound: 614 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 615 if (opt && opt->ip6po_nextroute.ro_rt) { 616 /* 617 * The nexthop is explicitly specified by the 618 * application. We assume the next hop is an IPv6 619 * address. 620 */ 621 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 622 } 623 else if ((rt->rt_flags & RTF_GATEWAY)) 624 dst = (struct sockaddr_in6 *)rt->rt_gateway; 625 } 626 627 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 628 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 629 } else { 630 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 631 in6_ifstat_inc(ifp, ifs6_out_mcast); 632 /* 633 * Confirm that the outgoing interface supports multicast. 634 */ 635 if (!(ifp->if_flags & IFF_MULTICAST)) { 636 IP6STAT_INC(ip6s_noroute); 637 in6_ifstat_inc(ifp, ifs6_out_discard); 638 error = ENETUNREACH; 639 goto bad; 640 } 641 if ((im6o == NULL && in6_mcast_loop) || 642 (im6o && im6o->im6o_multicast_loop)) { 643 /* 644 * Loop back multicast datagram if not expressly 645 * forbidden to do so, even if we have not joined 646 * the address; protocols will filter it later, 647 * thus deferring a hash lookup and lock acquisition 648 * at the expense of an m_copym(). 649 */ 650 ip6_mloopback(ifp, m, dst); 651 } else { 652 /* 653 * If we are acting as a multicast router, perform 654 * multicast forwarding as if the packet had just 655 * arrived on the interface to which we are about 656 * to send. The multicast forwarding function 657 * recursively calls this function, using the 658 * IPV6_FORWARDING flag to prevent infinite recursion. 659 * 660 * Multicasts that are looped back by ip6_mloopback(), 661 * above, will be forwarded by the ip6_input() routine, 662 * if necessary. 663 */ 664 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 665 /* 666 * XXX: ip6_mforward expects that rcvif is NULL 667 * when it is called from the originating path. 668 * However, it may not always be the case. 669 */ 670 m->m_pkthdr.rcvif = NULL; 671 if (ip6_mforward(ip6, ifp, m) != 0) { 672 m_freem(m); 673 goto done; 674 } 675 } 676 } 677 /* 678 * Multicasts with a hoplimit of zero may be looped back, 679 * above, but must not be transmitted on a network. 680 * Also, multicasts addressed to the loopback interface 681 * are not sent -- the above call to ip6_mloopback() will 682 * loop back a copy if this host actually belongs to the 683 * destination group on the loopback interface. 684 */ 685 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 686 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 687 m_freem(m); 688 goto done; 689 } 690 } 691 692 /* 693 * Fill the outgoing inteface to tell the upper layer 694 * to increment per-interface statistics. 695 */ 696 if (ifpp) 697 *ifpp = ifp; 698 699 /* Determine path MTU. */ 700 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 701 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 702 goto bad; 703 704 /* 705 * The caller of this function may specify to use the minimum MTU 706 * in some cases. 707 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 708 * setting. The logic is a bit complicated; by default, unicast 709 * packets will follow path MTU while multicast packets will be sent at 710 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 711 * including unicast ones will be sent at the minimum MTU. Multicast 712 * packets will always be sent at the minimum MTU unless 713 * IP6PO_MINMTU_DISABLE is explicitly specified. 714 * See RFC 3542 for more details. 715 */ 716 if (mtu > IPV6_MMTU) { 717 if ((flags & IPV6_MINMTU)) 718 mtu = IPV6_MMTU; 719 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 720 mtu = IPV6_MMTU; 721 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 722 (opt == NULL || 723 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 724 mtu = IPV6_MMTU; 725 } 726 } 727 728 /* 729 * clear embedded scope identifiers if necessary. 730 * in6_clearscope will touch the addresses only when necessary. 731 */ 732 in6_clearscope(&ip6->ip6_src); 733 in6_clearscope(&ip6->ip6_dst); 734 735 /* 736 * If the outgoing packet contains a hop-by-hop options header, 737 * it must be examined and processed even by the source node. 738 * (RFC 2460, section 4.) 739 */ 740 if (exthdrs.ip6e_hbh) { 741 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 742 u_int32_t dummy; /* XXX unused */ 743 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 744 745 #ifdef DIAGNOSTIC 746 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 747 panic("ip6e_hbh is not contiguous"); 748 #endif 749 /* 750 * XXX: if we have to send an ICMPv6 error to the sender, 751 * we need the M_LOOP flag since icmp6_error() expects 752 * the IPv6 and the hop-by-hop options header are 753 * contiguous unless the flag is set. 754 */ 755 m->m_flags |= M_LOOP; 756 m->m_pkthdr.rcvif = ifp; 757 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 758 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 759 &dummy, &plen) < 0) { 760 /* m was already freed at this point */ 761 error = EINVAL;/* better error? */ 762 goto done; 763 } 764 m->m_flags &= ~M_LOOP; /* XXX */ 765 m->m_pkthdr.rcvif = NULL; 766 } 767 768 /* Jump over all PFIL processing if hooks are not active. */ 769 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 770 goto passout; 771 772 odst = ip6->ip6_dst; 773 /* Run through list of hooks for output packets. */ 774 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 775 if (error != 0 || m == NULL) 776 goto done; 777 ip6 = mtod(m, struct ip6_hdr *); 778 779 /* See if destination IP address was changed by packet filter. */ 780 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 781 m->m_flags |= M_SKIP_FIREWALL; 782 /* If destination is now ourself drop to ip6_input(). */ 783 if (in6_localip(&ip6->ip6_dst)) { 784 m->m_flags |= M_FASTFWD_OURS; 785 if (m->m_pkthdr.rcvif == NULL) 786 m->m_pkthdr.rcvif = V_loif; 787 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 788 m->m_pkthdr.csum_flags |= 789 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 790 m->m_pkthdr.csum_data = 0xffff; 791 } 792 #ifdef SCTP 793 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 794 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 795 #endif 796 error = netisr_queue(NETISR_IPV6, m); 797 goto done; 798 } else 799 goto again; /* Redo the routing table lookup. */ 800 } 801 802 /* See if local, if yes, send it to netisr. */ 803 if (m->m_flags & M_FASTFWD_OURS) { 804 if (m->m_pkthdr.rcvif == NULL) 805 m->m_pkthdr.rcvif = V_loif; 806 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 807 m->m_pkthdr.csum_flags |= 808 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 809 m->m_pkthdr.csum_data = 0xffff; 810 } 811 #ifdef SCTP 812 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 813 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 814 #endif 815 error = netisr_queue(NETISR_IPV6, m); 816 goto done; 817 } 818 /* Or forward to some other address? */ 819 if ((m->m_flags & M_IP6_NEXTHOP) && 820 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 821 dst = (struct sockaddr_in6 *)&ro->ro_dst; 822 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 823 m->m_flags |= M_SKIP_FIREWALL; 824 m->m_flags &= ~M_IP6_NEXTHOP; 825 m_tag_delete(m, fwd_tag); 826 goto again; 827 } 828 829 passout: 830 /* 831 * Send the packet to the outgoing interface. 832 * If necessary, do IPv6 fragmentation before sending. 833 * 834 * the logic here is rather complex: 835 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 836 * 1-a: send as is if tlen <= path mtu 837 * 1-b: fragment if tlen > path mtu 838 * 839 * 2: if user asks us not to fragment (dontfrag == 1) 840 * 2-a: send as is if tlen <= interface mtu 841 * 2-b: error if tlen > interface mtu 842 * 843 * 3: if we always need to attach fragment header (alwaysfrag == 1) 844 * always fragment 845 * 846 * 4: if dontfrag == 1 && alwaysfrag == 1 847 * error, as we cannot handle this conflicting request 848 */ 849 sw_csum = m->m_pkthdr.csum_flags; 850 if (!hdrsplit) { 851 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 852 sw_csum &= ~ifp->if_hwassist; 853 } else 854 tso = 0; 855 /* 856 * If we added extension headers, we will not do TSO and calculate the 857 * checksums ourselves for now. 858 * XXX-BZ Need a framework to know when the NIC can handle it, even 859 * with ext. hdrs. 860 */ 861 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 862 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 863 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 864 } 865 #ifdef SCTP 866 if (sw_csum & CSUM_SCTP_IPV6) { 867 sw_csum &= ~CSUM_SCTP_IPV6; 868 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 869 } 870 #endif 871 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 872 tlen = m->m_pkthdr.len; 873 874 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 875 dontfrag = 1; 876 else 877 dontfrag = 0; 878 if (dontfrag && alwaysfrag) { /* case 4 */ 879 /* conflicting request - can't transmit */ 880 error = EMSGSIZE; 881 goto bad; 882 } 883 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 884 /* 885 * Even if the DONTFRAG option is specified, we cannot send the 886 * packet when the data length is larger than the MTU of the 887 * outgoing interface. 888 * Notify the error by sending IPV6_PATHMTU ancillary data if 889 * application wanted to know the MTU value. Also return an 890 * error code (this is not described in the API spec). 891 */ 892 if (inp != NULL) 893 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 894 error = EMSGSIZE; 895 goto bad; 896 } 897 898 /* 899 * transmit packet without fragmentation 900 */ 901 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 902 struct in6_ifaddr *ia6; 903 904 ip6 = mtod(m, struct ip6_hdr *); 905 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 906 if (ia6) { 907 /* Record statistics for this interface address. */ 908 ia6->ia_ifa.if_opackets++; 909 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 910 ifa_free(&ia6->ia_ifa); 911 } 912 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 913 goto done; 914 } 915 916 /* 917 * try to fragment the packet. case 1-b and 3 918 */ 919 if (mtu < IPV6_MMTU) { 920 /* path MTU cannot be less than IPV6_MMTU */ 921 error = EMSGSIZE; 922 in6_ifstat_inc(ifp, ifs6_out_fragfail); 923 goto bad; 924 } else if (ip6->ip6_plen == 0) { 925 /* jumbo payload cannot be fragmented */ 926 error = EMSGSIZE; 927 in6_ifstat_inc(ifp, ifs6_out_fragfail); 928 goto bad; 929 } else { 930 u_char nextproto; 931 932 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 933 934 /* 935 * Too large for the destination or interface; 936 * fragment if possible. 937 * Must be able to put at least 8 bytes per fragment. 938 */ 939 hlen = unfragpartlen; 940 if (mtu > IPV6_MAXPACKET) 941 mtu = IPV6_MAXPACKET; 942 943 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 944 if (len < 8) { 945 error = EMSGSIZE; 946 in6_ifstat_inc(ifp, ifs6_out_fragfail); 947 goto bad; 948 } 949 950 /* 951 * Verify that we have any chance at all of being able to queue 952 * the packet or packet fragments 953 */ 954 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 955 < tlen /* - hlen */)) { 956 error = ENOBUFS; 957 IP6STAT_INC(ip6s_odropped); 958 goto bad; 959 } 960 961 962 /* 963 * If the interface will not calculate checksums on 964 * fragmented packets, then do it here. 965 * XXX-BZ handle the hw offloading case. Need flags. 966 */ 967 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 968 in6_delayed_cksum(m, plen, hlen); 969 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 970 } 971 #ifdef SCTP 972 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 973 sctp_delayed_cksum(m, hlen); 974 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 975 } 976 #endif 977 /* 978 * Change the next header field of the last header in the 979 * unfragmentable part. 980 */ 981 if (exthdrs.ip6e_rthdr) { 982 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 983 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 984 } else if (exthdrs.ip6e_dest1) { 985 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 986 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 987 } else if (exthdrs.ip6e_hbh) { 988 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 989 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 990 } else { 991 nextproto = ip6->ip6_nxt; 992 ip6->ip6_nxt = IPPROTO_FRAGMENT; 993 } 994 995 /* 996 * Loop through length of segment after first fragment, 997 * make new header and copy data of each part and link onto 998 * chain. 999 */ 1000 m0 = m; 1001 id = htonl(ip6_randomid()); 1002 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id))) 1003 goto sendorfree; 1004 1005 in6_ifstat_inc(ifp, ifs6_out_fragok); 1006 } 1007 1008 /* 1009 * Remove leading garbages. 1010 */ 1011 sendorfree: 1012 m = m0->m_nextpkt; 1013 m0->m_nextpkt = 0; 1014 m_freem(m0); 1015 for (m0 = m; m; m = m0) { 1016 m0 = m->m_nextpkt; 1017 m->m_nextpkt = 0; 1018 if (error == 0) { 1019 /* Record statistics for this interface address. */ 1020 if (ia) { 1021 ia->ia_ifa.if_opackets++; 1022 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1023 } 1024 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1025 } else 1026 m_freem(m); 1027 } 1028 1029 if (error == 0) 1030 IP6STAT_INC(ip6s_fragmented); 1031 1032 done: 1033 if (ro == &ip6route) 1034 RO_RTFREE(ro); 1035 if (ro_pmtu == &ip6route) 1036 RO_RTFREE(ro_pmtu); 1037 return (error); 1038 1039 freehdrs: 1040 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1041 m_freem(exthdrs.ip6e_dest1); 1042 m_freem(exthdrs.ip6e_rthdr); 1043 m_freem(exthdrs.ip6e_dest2); 1044 /* FALLTHROUGH */ 1045 bad: 1046 if (m) 1047 m_freem(m); 1048 goto done; 1049 } 1050 1051 static int 1052 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1053 { 1054 struct mbuf *m; 1055 1056 if (hlen > MCLBYTES) 1057 return (ENOBUFS); /* XXX */ 1058 1059 if (hlen > MLEN) 1060 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1061 else 1062 m = m_get(M_NOWAIT, MT_DATA); 1063 if (m == NULL) 1064 return (ENOBUFS); 1065 m->m_len = hlen; 1066 if (hdr) 1067 bcopy(hdr, mtod(m, caddr_t), hlen); 1068 1069 *mp = m; 1070 return (0); 1071 } 1072 1073 /* 1074 * Insert jumbo payload option. 1075 */ 1076 static int 1077 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1078 { 1079 struct mbuf *mopt; 1080 u_char *optbuf; 1081 u_int32_t v; 1082 1083 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1084 1085 /* 1086 * If there is no hop-by-hop options header, allocate new one. 1087 * If there is one but it doesn't have enough space to store the 1088 * jumbo payload option, allocate a cluster to store the whole options. 1089 * Otherwise, use it to store the options. 1090 */ 1091 if (exthdrs->ip6e_hbh == 0) { 1092 mopt = m_get(M_NOWAIT, MT_DATA); 1093 if (mopt == NULL) 1094 return (ENOBUFS); 1095 mopt->m_len = JUMBOOPTLEN; 1096 optbuf = mtod(mopt, u_char *); 1097 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1098 exthdrs->ip6e_hbh = mopt; 1099 } else { 1100 struct ip6_hbh *hbh; 1101 1102 mopt = exthdrs->ip6e_hbh; 1103 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1104 /* 1105 * XXX assumption: 1106 * - exthdrs->ip6e_hbh is not referenced from places 1107 * other than exthdrs. 1108 * - exthdrs->ip6e_hbh is not an mbuf chain. 1109 */ 1110 int oldoptlen = mopt->m_len; 1111 struct mbuf *n; 1112 1113 /* 1114 * XXX: give up if the whole (new) hbh header does 1115 * not fit even in an mbuf cluster. 1116 */ 1117 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1118 return (ENOBUFS); 1119 1120 /* 1121 * As a consequence, we must always prepare a cluster 1122 * at this point. 1123 */ 1124 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1125 if (n == NULL) 1126 return (ENOBUFS); 1127 n->m_len = oldoptlen + JUMBOOPTLEN; 1128 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1129 oldoptlen); 1130 optbuf = mtod(n, caddr_t) + oldoptlen; 1131 m_freem(mopt); 1132 mopt = exthdrs->ip6e_hbh = n; 1133 } else { 1134 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1135 mopt->m_len += JUMBOOPTLEN; 1136 } 1137 optbuf[0] = IP6OPT_PADN; 1138 optbuf[1] = 1; 1139 1140 /* 1141 * Adjust the header length according to the pad and 1142 * the jumbo payload option. 1143 */ 1144 hbh = mtod(mopt, struct ip6_hbh *); 1145 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1146 } 1147 1148 /* fill in the option. */ 1149 optbuf[2] = IP6OPT_JUMBO; 1150 optbuf[3] = 4; 1151 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1152 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1153 1154 /* finally, adjust the packet header length */ 1155 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1156 1157 return (0); 1158 #undef JUMBOOPTLEN 1159 } 1160 1161 /* 1162 * Insert fragment header and copy unfragmentable header portions. 1163 */ 1164 static int 1165 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1166 struct ip6_frag **frghdrp) 1167 { 1168 struct mbuf *n, *mlast; 1169 1170 if (hlen > sizeof(struct ip6_hdr)) { 1171 n = m_copym(m0, sizeof(struct ip6_hdr), 1172 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1173 if (n == 0) 1174 return (ENOBUFS); 1175 m->m_next = n; 1176 } else 1177 n = m; 1178 1179 /* Search for the last mbuf of unfragmentable part. */ 1180 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1181 ; 1182 1183 if ((mlast->m_flags & M_EXT) == 0 && 1184 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1185 /* use the trailing space of the last mbuf for the fragment hdr */ 1186 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1187 mlast->m_len); 1188 mlast->m_len += sizeof(struct ip6_frag); 1189 m->m_pkthdr.len += sizeof(struct ip6_frag); 1190 } else { 1191 /* allocate a new mbuf for the fragment header */ 1192 struct mbuf *mfrg; 1193 1194 mfrg = m_get(M_NOWAIT, MT_DATA); 1195 if (mfrg == NULL) 1196 return (ENOBUFS); 1197 mfrg->m_len = sizeof(struct ip6_frag); 1198 *frghdrp = mtod(mfrg, struct ip6_frag *); 1199 mlast->m_next = mfrg; 1200 } 1201 1202 return (0); 1203 } 1204 1205 static int 1206 ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1207 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1208 int *alwaysfragp, u_int fibnum) 1209 { 1210 u_int32_t mtu = 0; 1211 int alwaysfrag = 0; 1212 int error = 0; 1213 1214 if (ro_pmtu != ro) { 1215 /* The first hop and the final destination may differ. */ 1216 struct sockaddr_in6 *sa6_dst = 1217 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1218 if (ro_pmtu->ro_rt && 1219 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1220 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1221 RTFREE(ro_pmtu->ro_rt); 1222 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1223 } 1224 if (ro_pmtu->ro_rt == NULL) { 1225 bzero(sa6_dst, sizeof(*sa6_dst)); 1226 sa6_dst->sin6_family = AF_INET6; 1227 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1228 sa6_dst->sin6_addr = *dst; 1229 1230 in6_rtalloc(ro_pmtu, fibnum); 1231 } 1232 } 1233 if (ro_pmtu->ro_rt) { 1234 u_int32_t ifmtu; 1235 struct in_conninfo inc; 1236 1237 bzero(&inc, sizeof(inc)); 1238 inc.inc_flags |= INC_ISIPV6; 1239 inc.inc6_faddr = *dst; 1240 1241 if (ifp == NULL) 1242 ifp = ro_pmtu->ro_rt->rt_ifp; 1243 ifmtu = IN6_LINKMTU(ifp); 1244 mtu = tcp_hc_getmtu(&inc); 1245 if (mtu) 1246 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu); 1247 else 1248 mtu = ro_pmtu->ro_rt->rt_mtu; 1249 if (mtu == 0) 1250 mtu = ifmtu; 1251 else if (mtu < IPV6_MMTU) { 1252 /* 1253 * RFC2460 section 5, last paragraph: 1254 * if we record ICMPv6 too big message with 1255 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1256 * or smaller, with framgent header attached. 1257 * (fragment header is needed regardless from the 1258 * packet size, for translators to identify packets) 1259 */ 1260 alwaysfrag = 1; 1261 mtu = IPV6_MMTU; 1262 } else if (mtu > ifmtu) { 1263 /* 1264 * The MTU on the route is larger than the MTU on 1265 * the interface! This shouldn't happen, unless the 1266 * MTU of the interface has been changed after the 1267 * interface was brought up. Change the MTU in the 1268 * route to match the interface MTU (as long as the 1269 * field isn't locked). 1270 */ 1271 mtu = ifmtu; 1272 ro_pmtu->ro_rt->rt_mtu = mtu; 1273 } 1274 } else if (ifp) { 1275 mtu = IN6_LINKMTU(ifp); 1276 } else 1277 error = EHOSTUNREACH; /* XXX */ 1278 1279 *mtup = mtu; 1280 if (alwaysfragp) 1281 *alwaysfragp = alwaysfrag; 1282 return (error); 1283 } 1284 1285 /* 1286 * IP6 socket option processing. 1287 */ 1288 int 1289 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1290 { 1291 int optdatalen, uproto; 1292 void *optdata; 1293 struct inpcb *in6p = sotoinpcb(so); 1294 int error, optval; 1295 int level, op, optname; 1296 int optlen; 1297 struct thread *td; 1298 1299 level = sopt->sopt_level; 1300 op = sopt->sopt_dir; 1301 optname = sopt->sopt_name; 1302 optlen = sopt->sopt_valsize; 1303 td = sopt->sopt_td; 1304 error = 0; 1305 optval = 0; 1306 uproto = (int)so->so_proto->pr_protocol; 1307 1308 if (level != IPPROTO_IPV6) { 1309 error = EINVAL; 1310 1311 if (sopt->sopt_level == SOL_SOCKET && 1312 sopt->sopt_dir == SOPT_SET) { 1313 switch (sopt->sopt_name) { 1314 case SO_REUSEADDR: 1315 INP_WLOCK(in6p); 1316 if ((so->so_options & SO_REUSEADDR) != 0) 1317 in6p->inp_flags2 |= INP_REUSEADDR; 1318 else 1319 in6p->inp_flags2 &= ~INP_REUSEADDR; 1320 INP_WUNLOCK(in6p); 1321 error = 0; 1322 break; 1323 case SO_REUSEPORT: 1324 INP_WLOCK(in6p); 1325 if ((so->so_options & SO_REUSEPORT) != 0) 1326 in6p->inp_flags2 |= INP_REUSEPORT; 1327 else 1328 in6p->inp_flags2 &= ~INP_REUSEPORT; 1329 INP_WUNLOCK(in6p); 1330 error = 0; 1331 break; 1332 case SO_SETFIB: 1333 INP_WLOCK(in6p); 1334 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1335 INP_WUNLOCK(in6p); 1336 error = 0; 1337 break; 1338 default: 1339 break; 1340 } 1341 } 1342 } else { /* level == IPPROTO_IPV6 */ 1343 switch (op) { 1344 1345 case SOPT_SET: 1346 switch (optname) { 1347 case IPV6_2292PKTOPTIONS: 1348 #ifdef IPV6_PKTOPTIONS 1349 case IPV6_PKTOPTIONS: 1350 #endif 1351 { 1352 struct mbuf *m; 1353 1354 error = soopt_getm(sopt, &m); /* XXX */ 1355 if (error != 0) 1356 break; 1357 error = soopt_mcopyin(sopt, m); /* XXX */ 1358 if (error != 0) 1359 break; 1360 error = ip6_pcbopts(&in6p->in6p_outputopts, 1361 m, so, sopt); 1362 m_freem(m); /* XXX */ 1363 break; 1364 } 1365 1366 /* 1367 * Use of some Hop-by-Hop options or some 1368 * Destination options, might require special 1369 * privilege. That is, normal applications 1370 * (without special privilege) might be forbidden 1371 * from setting certain options in outgoing packets, 1372 * and might never see certain options in received 1373 * packets. [RFC 2292 Section 6] 1374 * KAME specific note: 1375 * KAME prevents non-privileged users from sending or 1376 * receiving ANY hbh/dst options in order to avoid 1377 * overhead of parsing options in the kernel. 1378 */ 1379 case IPV6_RECVHOPOPTS: 1380 case IPV6_RECVDSTOPTS: 1381 case IPV6_RECVRTHDRDSTOPTS: 1382 if (td != NULL) { 1383 error = priv_check(td, 1384 PRIV_NETINET_SETHDROPTS); 1385 if (error) 1386 break; 1387 } 1388 /* FALLTHROUGH */ 1389 case IPV6_UNICAST_HOPS: 1390 case IPV6_HOPLIMIT: 1391 case IPV6_FAITH: 1392 1393 case IPV6_RECVPKTINFO: 1394 case IPV6_RECVHOPLIMIT: 1395 case IPV6_RECVRTHDR: 1396 case IPV6_RECVPATHMTU: 1397 case IPV6_RECVTCLASS: 1398 case IPV6_V6ONLY: 1399 case IPV6_AUTOFLOWLABEL: 1400 case IPV6_BINDANY: 1401 if (optname == IPV6_BINDANY && td != NULL) { 1402 error = priv_check(td, 1403 PRIV_NETINET_BINDANY); 1404 if (error) 1405 break; 1406 } 1407 1408 if (optlen != sizeof(int)) { 1409 error = EINVAL; 1410 break; 1411 } 1412 error = sooptcopyin(sopt, &optval, 1413 sizeof optval, sizeof optval); 1414 if (error) 1415 break; 1416 switch (optname) { 1417 1418 case IPV6_UNICAST_HOPS: 1419 if (optval < -1 || optval >= 256) 1420 error = EINVAL; 1421 else { 1422 /* -1 = kernel default */ 1423 in6p->in6p_hops = optval; 1424 if ((in6p->inp_vflag & 1425 INP_IPV4) != 0) 1426 in6p->inp_ip_ttl = optval; 1427 } 1428 break; 1429 #define OPTSET(bit) \ 1430 do { \ 1431 INP_WLOCK(in6p); \ 1432 if (optval) \ 1433 in6p->inp_flags |= (bit); \ 1434 else \ 1435 in6p->inp_flags &= ~(bit); \ 1436 INP_WUNLOCK(in6p); \ 1437 } while (/*CONSTCOND*/ 0) 1438 #define OPTSET2292(bit) \ 1439 do { \ 1440 INP_WLOCK(in6p); \ 1441 in6p->inp_flags |= IN6P_RFC2292; \ 1442 if (optval) \ 1443 in6p->inp_flags |= (bit); \ 1444 else \ 1445 in6p->inp_flags &= ~(bit); \ 1446 INP_WUNLOCK(in6p); \ 1447 } while (/*CONSTCOND*/ 0) 1448 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1449 1450 case IPV6_RECVPKTINFO: 1451 /* cannot mix with RFC2292 */ 1452 if (OPTBIT(IN6P_RFC2292)) { 1453 error = EINVAL; 1454 break; 1455 } 1456 OPTSET(IN6P_PKTINFO); 1457 break; 1458 1459 case IPV6_HOPLIMIT: 1460 { 1461 struct ip6_pktopts **optp; 1462 1463 /* cannot mix with RFC2292 */ 1464 if (OPTBIT(IN6P_RFC2292)) { 1465 error = EINVAL; 1466 break; 1467 } 1468 optp = &in6p->in6p_outputopts; 1469 error = ip6_pcbopt(IPV6_HOPLIMIT, 1470 (u_char *)&optval, sizeof(optval), 1471 optp, (td != NULL) ? td->td_ucred : 1472 NULL, uproto); 1473 break; 1474 } 1475 1476 case IPV6_RECVHOPLIMIT: 1477 /* cannot mix with RFC2292 */ 1478 if (OPTBIT(IN6P_RFC2292)) { 1479 error = EINVAL; 1480 break; 1481 } 1482 OPTSET(IN6P_HOPLIMIT); 1483 break; 1484 1485 case IPV6_RECVHOPOPTS: 1486 /* cannot mix with RFC2292 */ 1487 if (OPTBIT(IN6P_RFC2292)) { 1488 error = EINVAL; 1489 break; 1490 } 1491 OPTSET(IN6P_HOPOPTS); 1492 break; 1493 1494 case IPV6_RECVDSTOPTS: 1495 /* cannot mix with RFC2292 */ 1496 if (OPTBIT(IN6P_RFC2292)) { 1497 error = EINVAL; 1498 break; 1499 } 1500 OPTSET(IN6P_DSTOPTS); 1501 break; 1502 1503 case IPV6_RECVRTHDRDSTOPTS: 1504 /* cannot mix with RFC2292 */ 1505 if (OPTBIT(IN6P_RFC2292)) { 1506 error = EINVAL; 1507 break; 1508 } 1509 OPTSET(IN6P_RTHDRDSTOPTS); 1510 break; 1511 1512 case IPV6_RECVRTHDR: 1513 /* cannot mix with RFC2292 */ 1514 if (OPTBIT(IN6P_RFC2292)) { 1515 error = EINVAL; 1516 break; 1517 } 1518 OPTSET(IN6P_RTHDR); 1519 break; 1520 1521 case IPV6_FAITH: 1522 OPTSET(INP_FAITH); 1523 break; 1524 1525 case IPV6_RECVPATHMTU: 1526 /* 1527 * We ignore this option for TCP 1528 * sockets. 1529 * (RFC3542 leaves this case 1530 * unspecified.) 1531 */ 1532 if (uproto != IPPROTO_TCP) 1533 OPTSET(IN6P_MTU); 1534 break; 1535 1536 case IPV6_V6ONLY: 1537 /* 1538 * make setsockopt(IPV6_V6ONLY) 1539 * available only prior to bind(2). 1540 * see ipng mailing list, Jun 22 2001. 1541 */ 1542 if (in6p->inp_lport || 1543 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1544 error = EINVAL; 1545 break; 1546 } 1547 OPTSET(IN6P_IPV6_V6ONLY); 1548 if (optval) 1549 in6p->inp_vflag &= ~INP_IPV4; 1550 else 1551 in6p->inp_vflag |= INP_IPV4; 1552 break; 1553 case IPV6_RECVTCLASS: 1554 /* cannot mix with RFC2292 XXX */ 1555 if (OPTBIT(IN6P_RFC2292)) { 1556 error = EINVAL; 1557 break; 1558 } 1559 OPTSET(IN6P_TCLASS); 1560 break; 1561 case IPV6_AUTOFLOWLABEL: 1562 OPTSET(IN6P_AUTOFLOWLABEL); 1563 break; 1564 1565 case IPV6_BINDANY: 1566 OPTSET(INP_BINDANY); 1567 break; 1568 } 1569 break; 1570 1571 case IPV6_TCLASS: 1572 case IPV6_DONTFRAG: 1573 case IPV6_USE_MIN_MTU: 1574 case IPV6_PREFER_TEMPADDR: 1575 if (optlen != sizeof(optval)) { 1576 error = EINVAL; 1577 break; 1578 } 1579 error = sooptcopyin(sopt, &optval, 1580 sizeof optval, sizeof optval); 1581 if (error) 1582 break; 1583 { 1584 struct ip6_pktopts **optp; 1585 optp = &in6p->in6p_outputopts; 1586 error = ip6_pcbopt(optname, 1587 (u_char *)&optval, sizeof(optval), 1588 optp, (td != NULL) ? td->td_ucred : 1589 NULL, uproto); 1590 break; 1591 } 1592 1593 case IPV6_2292PKTINFO: 1594 case IPV6_2292HOPLIMIT: 1595 case IPV6_2292HOPOPTS: 1596 case IPV6_2292DSTOPTS: 1597 case IPV6_2292RTHDR: 1598 /* RFC 2292 */ 1599 if (optlen != sizeof(int)) { 1600 error = EINVAL; 1601 break; 1602 } 1603 error = sooptcopyin(sopt, &optval, 1604 sizeof optval, sizeof optval); 1605 if (error) 1606 break; 1607 switch (optname) { 1608 case IPV6_2292PKTINFO: 1609 OPTSET2292(IN6P_PKTINFO); 1610 break; 1611 case IPV6_2292HOPLIMIT: 1612 OPTSET2292(IN6P_HOPLIMIT); 1613 break; 1614 case IPV6_2292HOPOPTS: 1615 /* 1616 * Check super-user privilege. 1617 * See comments for IPV6_RECVHOPOPTS. 1618 */ 1619 if (td != NULL) { 1620 error = priv_check(td, 1621 PRIV_NETINET_SETHDROPTS); 1622 if (error) 1623 return (error); 1624 } 1625 OPTSET2292(IN6P_HOPOPTS); 1626 break; 1627 case IPV6_2292DSTOPTS: 1628 if (td != NULL) { 1629 error = priv_check(td, 1630 PRIV_NETINET_SETHDROPTS); 1631 if (error) 1632 return (error); 1633 } 1634 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1635 break; 1636 case IPV6_2292RTHDR: 1637 OPTSET2292(IN6P_RTHDR); 1638 break; 1639 } 1640 break; 1641 case IPV6_PKTINFO: 1642 case IPV6_HOPOPTS: 1643 case IPV6_RTHDR: 1644 case IPV6_DSTOPTS: 1645 case IPV6_RTHDRDSTOPTS: 1646 case IPV6_NEXTHOP: 1647 { 1648 /* new advanced API (RFC3542) */ 1649 u_char *optbuf; 1650 u_char optbuf_storage[MCLBYTES]; 1651 int optlen; 1652 struct ip6_pktopts **optp; 1653 1654 /* cannot mix with RFC2292 */ 1655 if (OPTBIT(IN6P_RFC2292)) { 1656 error = EINVAL; 1657 break; 1658 } 1659 1660 /* 1661 * We only ensure valsize is not too large 1662 * here. Further validation will be done 1663 * later. 1664 */ 1665 error = sooptcopyin(sopt, optbuf_storage, 1666 sizeof(optbuf_storage), 0); 1667 if (error) 1668 break; 1669 optlen = sopt->sopt_valsize; 1670 optbuf = optbuf_storage; 1671 optp = &in6p->in6p_outputopts; 1672 error = ip6_pcbopt(optname, optbuf, optlen, 1673 optp, (td != NULL) ? td->td_ucred : NULL, 1674 uproto); 1675 break; 1676 } 1677 #undef OPTSET 1678 1679 case IPV6_MULTICAST_IF: 1680 case IPV6_MULTICAST_HOPS: 1681 case IPV6_MULTICAST_LOOP: 1682 case IPV6_JOIN_GROUP: 1683 case IPV6_LEAVE_GROUP: 1684 case IPV6_MSFILTER: 1685 case MCAST_BLOCK_SOURCE: 1686 case MCAST_UNBLOCK_SOURCE: 1687 case MCAST_JOIN_GROUP: 1688 case MCAST_LEAVE_GROUP: 1689 case MCAST_JOIN_SOURCE_GROUP: 1690 case MCAST_LEAVE_SOURCE_GROUP: 1691 error = ip6_setmoptions(in6p, sopt); 1692 break; 1693 1694 case IPV6_PORTRANGE: 1695 error = sooptcopyin(sopt, &optval, 1696 sizeof optval, sizeof optval); 1697 if (error) 1698 break; 1699 1700 INP_WLOCK(in6p); 1701 switch (optval) { 1702 case IPV6_PORTRANGE_DEFAULT: 1703 in6p->inp_flags &= ~(INP_LOWPORT); 1704 in6p->inp_flags &= ~(INP_HIGHPORT); 1705 break; 1706 1707 case IPV6_PORTRANGE_HIGH: 1708 in6p->inp_flags &= ~(INP_LOWPORT); 1709 in6p->inp_flags |= INP_HIGHPORT; 1710 break; 1711 1712 case IPV6_PORTRANGE_LOW: 1713 in6p->inp_flags &= ~(INP_HIGHPORT); 1714 in6p->inp_flags |= INP_LOWPORT; 1715 break; 1716 1717 default: 1718 error = EINVAL; 1719 break; 1720 } 1721 INP_WUNLOCK(in6p); 1722 break; 1723 1724 #ifdef IPSEC 1725 case IPV6_IPSEC_POLICY: 1726 { 1727 caddr_t req; 1728 struct mbuf *m; 1729 1730 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1731 break; 1732 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1733 break; 1734 req = mtod(m, caddr_t); 1735 error = ipsec_set_policy(in6p, optname, req, 1736 m->m_len, (sopt->sopt_td != NULL) ? 1737 sopt->sopt_td->td_ucred : NULL); 1738 m_freem(m); 1739 break; 1740 } 1741 #endif /* IPSEC */ 1742 1743 default: 1744 error = ENOPROTOOPT; 1745 break; 1746 } 1747 break; 1748 1749 case SOPT_GET: 1750 switch (optname) { 1751 1752 case IPV6_2292PKTOPTIONS: 1753 #ifdef IPV6_PKTOPTIONS 1754 case IPV6_PKTOPTIONS: 1755 #endif 1756 /* 1757 * RFC3542 (effectively) deprecated the 1758 * semantics of the 2292-style pktoptions. 1759 * Since it was not reliable in nature (i.e., 1760 * applications had to expect the lack of some 1761 * information after all), it would make sense 1762 * to simplify this part by always returning 1763 * empty data. 1764 */ 1765 sopt->sopt_valsize = 0; 1766 break; 1767 1768 case IPV6_RECVHOPOPTS: 1769 case IPV6_RECVDSTOPTS: 1770 case IPV6_RECVRTHDRDSTOPTS: 1771 case IPV6_UNICAST_HOPS: 1772 case IPV6_RECVPKTINFO: 1773 case IPV6_RECVHOPLIMIT: 1774 case IPV6_RECVRTHDR: 1775 case IPV6_RECVPATHMTU: 1776 1777 case IPV6_FAITH: 1778 case IPV6_V6ONLY: 1779 case IPV6_PORTRANGE: 1780 case IPV6_RECVTCLASS: 1781 case IPV6_AUTOFLOWLABEL: 1782 case IPV6_BINDANY: 1783 switch (optname) { 1784 1785 case IPV6_RECVHOPOPTS: 1786 optval = OPTBIT(IN6P_HOPOPTS); 1787 break; 1788 1789 case IPV6_RECVDSTOPTS: 1790 optval = OPTBIT(IN6P_DSTOPTS); 1791 break; 1792 1793 case IPV6_RECVRTHDRDSTOPTS: 1794 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1795 break; 1796 1797 case IPV6_UNICAST_HOPS: 1798 optval = in6p->in6p_hops; 1799 break; 1800 1801 case IPV6_RECVPKTINFO: 1802 optval = OPTBIT(IN6P_PKTINFO); 1803 break; 1804 1805 case IPV6_RECVHOPLIMIT: 1806 optval = OPTBIT(IN6P_HOPLIMIT); 1807 break; 1808 1809 case IPV6_RECVRTHDR: 1810 optval = OPTBIT(IN6P_RTHDR); 1811 break; 1812 1813 case IPV6_RECVPATHMTU: 1814 optval = OPTBIT(IN6P_MTU); 1815 break; 1816 1817 case IPV6_FAITH: 1818 optval = OPTBIT(INP_FAITH); 1819 break; 1820 1821 case IPV6_V6ONLY: 1822 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1823 break; 1824 1825 case IPV6_PORTRANGE: 1826 { 1827 int flags; 1828 flags = in6p->inp_flags; 1829 if (flags & INP_HIGHPORT) 1830 optval = IPV6_PORTRANGE_HIGH; 1831 else if (flags & INP_LOWPORT) 1832 optval = IPV6_PORTRANGE_LOW; 1833 else 1834 optval = 0; 1835 break; 1836 } 1837 case IPV6_RECVTCLASS: 1838 optval = OPTBIT(IN6P_TCLASS); 1839 break; 1840 1841 case IPV6_AUTOFLOWLABEL: 1842 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1843 break; 1844 1845 case IPV6_BINDANY: 1846 optval = OPTBIT(INP_BINDANY); 1847 break; 1848 } 1849 if (error) 1850 break; 1851 error = sooptcopyout(sopt, &optval, 1852 sizeof optval); 1853 break; 1854 1855 case IPV6_PATHMTU: 1856 { 1857 u_long pmtu = 0; 1858 struct ip6_mtuinfo mtuinfo; 1859 struct route_in6 sro; 1860 1861 bzero(&sro, sizeof(sro)); 1862 1863 if (!(so->so_state & SS_ISCONNECTED)) 1864 return (ENOTCONN); 1865 /* 1866 * XXX: we dot not consider the case of source 1867 * routing, or optional information to specify 1868 * the outgoing interface. 1869 */ 1870 error = ip6_getpmtu(&sro, NULL, NULL, 1871 &in6p->in6p_faddr, &pmtu, NULL, 1872 so->so_fibnum); 1873 if (sro.ro_rt) 1874 RTFREE(sro.ro_rt); 1875 if (error) 1876 break; 1877 if (pmtu > IPV6_MAXPACKET) 1878 pmtu = IPV6_MAXPACKET; 1879 1880 bzero(&mtuinfo, sizeof(mtuinfo)); 1881 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1882 optdata = (void *)&mtuinfo; 1883 optdatalen = sizeof(mtuinfo); 1884 error = sooptcopyout(sopt, optdata, 1885 optdatalen); 1886 break; 1887 } 1888 1889 case IPV6_2292PKTINFO: 1890 case IPV6_2292HOPLIMIT: 1891 case IPV6_2292HOPOPTS: 1892 case IPV6_2292RTHDR: 1893 case IPV6_2292DSTOPTS: 1894 switch (optname) { 1895 case IPV6_2292PKTINFO: 1896 optval = OPTBIT(IN6P_PKTINFO); 1897 break; 1898 case IPV6_2292HOPLIMIT: 1899 optval = OPTBIT(IN6P_HOPLIMIT); 1900 break; 1901 case IPV6_2292HOPOPTS: 1902 optval = OPTBIT(IN6P_HOPOPTS); 1903 break; 1904 case IPV6_2292RTHDR: 1905 optval = OPTBIT(IN6P_RTHDR); 1906 break; 1907 case IPV6_2292DSTOPTS: 1908 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1909 break; 1910 } 1911 error = sooptcopyout(sopt, &optval, 1912 sizeof optval); 1913 break; 1914 case IPV6_PKTINFO: 1915 case IPV6_HOPOPTS: 1916 case IPV6_RTHDR: 1917 case IPV6_DSTOPTS: 1918 case IPV6_RTHDRDSTOPTS: 1919 case IPV6_NEXTHOP: 1920 case IPV6_TCLASS: 1921 case IPV6_DONTFRAG: 1922 case IPV6_USE_MIN_MTU: 1923 case IPV6_PREFER_TEMPADDR: 1924 error = ip6_getpcbopt(in6p->in6p_outputopts, 1925 optname, sopt); 1926 break; 1927 1928 case IPV6_MULTICAST_IF: 1929 case IPV6_MULTICAST_HOPS: 1930 case IPV6_MULTICAST_LOOP: 1931 case IPV6_MSFILTER: 1932 error = ip6_getmoptions(in6p, sopt); 1933 break; 1934 1935 #ifdef IPSEC 1936 case IPV6_IPSEC_POLICY: 1937 { 1938 caddr_t req = NULL; 1939 size_t len = 0; 1940 struct mbuf *m = NULL; 1941 struct mbuf **mp = &m; 1942 size_t ovalsize = sopt->sopt_valsize; 1943 caddr_t oval = (caddr_t)sopt->sopt_val; 1944 1945 error = soopt_getm(sopt, &m); /* XXX */ 1946 if (error != 0) 1947 break; 1948 error = soopt_mcopyin(sopt, m); /* XXX */ 1949 if (error != 0) 1950 break; 1951 sopt->sopt_valsize = ovalsize; 1952 sopt->sopt_val = oval; 1953 if (m) { 1954 req = mtod(m, caddr_t); 1955 len = m->m_len; 1956 } 1957 error = ipsec_get_policy(in6p, req, len, mp); 1958 if (error == 0) 1959 error = soopt_mcopyout(sopt, m); /* XXX */ 1960 if (error == 0 && m) 1961 m_freem(m); 1962 break; 1963 } 1964 #endif /* IPSEC */ 1965 1966 default: 1967 error = ENOPROTOOPT; 1968 break; 1969 } 1970 break; 1971 } 1972 } 1973 return (error); 1974 } 1975 1976 int 1977 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1978 { 1979 int error = 0, optval, optlen; 1980 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1981 struct inpcb *in6p = sotoinpcb(so); 1982 int level, op, optname; 1983 1984 level = sopt->sopt_level; 1985 op = sopt->sopt_dir; 1986 optname = sopt->sopt_name; 1987 optlen = sopt->sopt_valsize; 1988 1989 if (level != IPPROTO_IPV6) { 1990 return (EINVAL); 1991 } 1992 1993 switch (optname) { 1994 case IPV6_CHECKSUM: 1995 /* 1996 * For ICMPv6 sockets, no modification allowed for checksum 1997 * offset, permit "no change" values to help existing apps. 1998 * 1999 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2000 * for an ICMPv6 socket will fail." 2001 * The current behavior does not meet RFC3542. 2002 */ 2003 switch (op) { 2004 case SOPT_SET: 2005 if (optlen != sizeof(int)) { 2006 error = EINVAL; 2007 break; 2008 } 2009 error = sooptcopyin(sopt, &optval, sizeof(optval), 2010 sizeof(optval)); 2011 if (error) 2012 break; 2013 if ((optval % 2) != 0) { 2014 /* the API assumes even offset values */ 2015 error = EINVAL; 2016 } else if (so->so_proto->pr_protocol == 2017 IPPROTO_ICMPV6) { 2018 if (optval != icmp6off) 2019 error = EINVAL; 2020 } else 2021 in6p->in6p_cksum = optval; 2022 break; 2023 2024 case SOPT_GET: 2025 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2026 optval = icmp6off; 2027 else 2028 optval = in6p->in6p_cksum; 2029 2030 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2031 break; 2032 2033 default: 2034 error = EINVAL; 2035 break; 2036 } 2037 break; 2038 2039 default: 2040 error = ENOPROTOOPT; 2041 break; 2042 } 2043 2044 return (error); 2045 } 2046 2047 /* 2048 * Set up IP6 options in pcb for insertion in output packets or 2049 * specifying behavior of outgoing packets. 2050 */ 2051 static int 2052 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2053 struct socket *so, struct sockopt *sopt) 2054 { 2055 struct ip6_pktopts *opt = *pktopt; 2056 int error = 0; 2057 struct thread *td = sopt->sopt_td; 2058 2059 /* turn off any old options. */ 2060 if (opt) { 2061 #ifdef DIAGNOSTIC 2062 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2063 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2064 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2065 printf("ip6_pcbopts: all specified options are cleared.\n"); 2066 #endif 2067 ip6_clearpktopts(opt, -1); 2068 } else 2069 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2070 *pktopt = NULL; 2071 2072 if (!m || m->m_len == 0) { 2073 /* 2074 * Only turning off any previous options, regardless of 2075 * whether the opt is just created or given. 2076 */ 2077 free(opt, M_IP6OPT); 2078 return (0); 2079 } 2080 2081 /* set options specified by user. */ 2082 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2083 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2084 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2085 free(opt, M_IP6OPT); 2086 return (error); 2087 } 2088 *pktopt = opt; 2089 return (0); 2090 } 2091 2092 /* 2093 * initialize ip6_pktopts. beware that there are non-zero default values in 2094 * the struct. 2095 */ 2096 void 2097 ip6_initpktopts(struct ip6_pktopts *opt) 2098 { 2099 2100 bzero(opt, sizeof(*opt)); 2101 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2102 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2103 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2104 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2105 } 2106 2107 static int 2108 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2109 struct ucred *cred, int uproto) 2110 { 2111 struct ip6_pktopts *opt; 2112 2113 if (*pktopt == NULL) { 2114 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2115 M_WAITOK); 2116 ip6_initpktopts(*pktopt); 2117 } 2118 opt = *pktopt; 2119 2120 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2121 } 2122 2123 static int 2124 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2125 { 2126 void *optdata = NULL; 2127 int optdatalen = 0; 2128 struct ip6_ext *ip6e; 2129 int error = 0; 2130 struct in6_pktinfo null_pktinfo; 2131 int deftclass = 0, on; 2132 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2133 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2134 2135 switch (optname) { 2136 case IPV6_PKTINFO: 2137 if (pktopt && pktopt->ip6po_pktinfo) 2138 optdata = (void *)pktopt->ip6po_pktinfo; 2139 else { 2140 /* XXX: we don't have to do this every time... */ 2141 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2142 optdata = (void *)&null_pktinfo; 2143 } 2144 optdatalen = sizeof(struct in6_pktinfo); 2145 break; 2146 case IPV6_TCLASS: 2147 if (pktopt && pktopt->ip6po_tclass >= 0) 2148 optdata = (void *)&pktopt->ip6po_tclass; 2149 else 2150 optdata = (void *)&deftclass; 2151 optdatalen = sizeof(int); 2152 break; 2153 case IPV6_HOPOPTS: 2154 if (pktopt && pktopt->ip6po_hbh) { 2155 optdata = (void *)pktopt->ip6po_hbh; 2156 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2157 optdatalen = (ip6e->ip6e_len + 1) << 3; 2158 } 2159 break; 2160 case IPV6_RTHDR: 2161 if (pktopt && pktopt->ip6po_rthdr) { 2162 optdata = (void *)pktopt->ip6po_rthdr; 2163 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2164 optdatalen = (ip6e->ip6e_len + 1) << 3; 2165 } 2166 break; 2167 case IPV6_RTHDRDSTOPTS: 2168 if (pktopt && pktopt->ip6po_dest1) { 2169 optdata = (void *)pktopt->ip6po_dest1; 2170 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2171 optdatalen = (ip6e->ip6e_len + 1) << 3; 2172 } 2173 break; 2174 case IPV6_DSTOPTS: 2175 if (pktopt && pktopt->ip6po_dest2) { 2176 optdata = (void *)pktopt->ip6po_dest2; 2177 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2178 optdatalen = (ip6e->ip6e_len + 1) << 3; 2179 } 2180 break; 2181 case IPV6_NEXTHOP: 2182 if (pktopt && pktopt->ip6po_nexthop) { 2183 optdata = (void *)pktopt->ip6po_nexthop; 2184 optdatalen = pktopt->ip6po_nexthop->sa_len; 2185 } 2186 break; 2187 case IPV6_USE_MIN_MTU: 2188 if (pktopt) 2189 optdata = (void *)&pktopt->ip6po_minmtu; 2190 else 2191 optdata = (void *)&defminmtu; 2192 optdatalen = sizeof(int); 2193 break; 2194 case IPV6_DONTFRAG: 2195 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2196 on = 1; 2197 else 2198 on = 0; 2199 optdata = (void *)&on; 2200 optdatalen = sizeof(on); 2201 break; 2202 case IPV6_PREFER_TEMPADDR: 2203 if (pktopt) 2204 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2205 else 2206 optdata = (void *)&defpreftemp; 2207 optdatalen = sizeof(int); 2208 break; 2209 default: /* should not happen */ 2210 #ifdef DIAGNOSTIC 2211 panic("ip6_getpcbopt: unexpected option\n"); 2212 #endif 2213 return (ENOPROTOOPT); 2214 } 2215 2216 error = sooptcopyout(sopt, optdata, optdatalen); 2217 2218 return (error); 2219 } 2220 2221 void 2222 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2223 { 2224 if (pktopt == NULL) 2225 return; 2226 2227 if (optname == -1 || optname == IPV6_PKTINFO) { 2228 if (pktopt->ip6po_pktinfo) 2229 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2230 pktopt->ip6po_pktinfo = NULL; 2231 } 2232 if (optname == -1 || optname == IPV6_HOPLIMIT) 2233 pktopt->ip6po_hlim = -1; 2234 if (optname == -1 || optname == IPV6_TCLASS) 2235 pktopt->ip6po_tclass = -1; 2236 if (optname == -1 || optname == IPV6_NEXTHOP) { 2237 if (pktopt->ip6po_nextroute.ro_rt) { 2238 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2239 pktopt->ip6po_nextroute.ro_rt = NULL; 2240 } 2241 if (pktopt->ip6po_nexthop) 2242 free(pktopt->ip6po_nexthop, M_IP6OPT); 2243 pktopt->ip6po_nexthop = NULL; 2244 } 2245 if (optname == -1 || optname == IPV6_HOPOPTS) { 2246 if (pktopt->ip6po_hbh) 2247 free(pktopt->ip6po_hbh, M_IP6OPT); 2248 pktopt->ip6po_hbh = NULL; 2249 } 2250 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2251 if (pktopt->ip6po_dest1) 2252 free(pktopt->ip6po_dest1, M_IP6OPT); 2253 pktopt->ip6po_dest1 = NULL; 2254 } 2255 if (optname == -1 || optname == IPV6_RTHDR) { 2256 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2257 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2258 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2259 if (pktopt->ip6po_route.ro_rt) { 2260 RTFREE(pktopt->ip6po_route.ro_rt); 2261 pktopt->ip6po_route.ro_rt = NULL; 2262 } 2263 } 2264 if (optname == -1 || optname == IPV6_DSTOPTS) { 2265 if (pktopt->ip6po_dest2) 2266 free(pktopt->ip6po_dest2, M_IP6OPT); 2267 pktopt->ip6po_dest2 = NULL; 2268 } 2269 } 2270 2271 #define PKTOPT_EXTHDRCPY(type) \ 2272 do {\ 2273 if (src->type) {\ 2274 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2275 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2276 if (dst->type == NULL && canwait == M_NOWAIT)\ 2277 goto bad;\ 2278 bcopy(src->type, dst->type, hlen);\ 2279 }\ 2280 } while (/*CONSTCOND*/ 0) 2281 2282 static int 2283 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2284 { 2285 if (dst == NULL || src == NULL) { 2286 printf("ip6_clearpktopts: invalid argument\n"); 2287 return (EINVAL); 2288 } 2289 2290 dst->ip6po_hlim = src->ip6po_hlim; 2291 dst->ip6po_tclass = src->ip6po_tclass; 2292 dst->ip6po_flags = src->ip6po_flags; 2293 dst->ip6po_minmtu = src->ip6po_minmtu; 2294 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2295 if (src->ip6po_pktinfo) { 2296 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2297 M_IP6OPT, canwait); 2298 if (dst->ip6po_pktinfo == NULL) 2299 goto bad; 2300 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2301 } 2302 if (src->ip6po_nexthop) { 2303 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2304 M_IP6OPT, canwait); 2305 if (dst->ip6po_nexthop == NULL) 2306 goto bad; 2307 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2308 src->ip6po_nexthop->sa_len); 2309 } 2310 PKTOPT_EXTHDRCPY(ip6po_hbh); 2311 PKTOPT_EXTHDRCPY(ip6po_dest1); 2312 PKTOPT_EXTHDRCPY(ip6po_dest2); 2313 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2314 return (0); 2315 2316 bad: 2317 ip6_clearpktopts(dst, -1); 2318 return (ENOBUFS); 2319 } 2320 #undef PKTOPT_EXTHDRCPY 2321 2322 struct ip6_pktopts * 2323 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2324 { 2325 int error; 2326 struct ip6_pktopts *dst; 2327 2328 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2329 if (dst == NULL) 2330 return (NULL); 2331 ip6_initpktopts(dst); 2332 2333 if ((error = copypktopts(dst, src, canwait)) != 0) { 2334 free(dst, M_IP6OPT); 2335 return (NULL); 2336 } 2337 2338 return (dst); 2339 } 2340 2341 void 2342 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2343 { 2344 if (pktopt == NULL) 2345 return; 2346 2347 ip6_clearpktopts(pktopt, -1); 2348 2349 free(pktopt, M_IP6OPT); 2350 } 2351 2352 /* 2353 * Set IPv6 outgoing packet options based on advanced API. 2354 */ 2355 int 2356 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2357 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2358 { 2359 struct cmsghdr *cm = 0; 2360 2361 if (control == NULL || opt == NULL) 2362 return (EINVAL); 2363 2364 ip6_initpktopts(opt); 2365 if (stickyopt) { 2366 int error; 2367 2368 /* 2369 * If stickyopt is provided, make a local copy of the options 2370 * for this particular packet, then override them by ancillary 2371 * objects. 2372 * XXX: copypktopts() does not copy the cached route to a next 2373 * hop (if any). This is not very good in terms of efficiency, 2374 * but we can allow this since this option should be rarely 2375 * used. 2376 */ 2377 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2378 return (error); 2379 } 2380 2381 /* 2382 * XXX: Currently, we assume all the optional information is stored 2383 * in a single mbuf. 2384 */ 2385 if (control->m_next) 2386 return (EINVAL); 2387 2388 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2389 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2390 int error; 2391 2392 if (control->m_len < CMSG_LEN(0)) 2393 return (EINVAL); 2394 2395 cm = mtod(control, struct cmsghdr *); 2396 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2397 return (EINVAL); 2398 if (cm->cmsg_level != IPPROTO_IPV6) 2399 continue; 2400 2401 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2402 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2403 if (error) 2404 return (error); 2405 } 2406 2407 return (0); 2408 } 2409 2410 /* 2411 * Set a particular packet option, as a sticky option or an ancillary data 2412 * item. "len" can be 0 only when it's a sticky option. 2413 * We have 4 cases of combination of "sticky" and "cmsg": 2414 * "sticky=0, cmsg=0": impossible 2415 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2416 * "sticky=1, cmsg=0": RFC3542 socket option 2417 * "sticky=1, cmsg=1": RFC2292 socket option 2418 */ 2419 static int 2420 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2421 struct ucred *cred, int sticky, int cmsg, int uproto) 2422 { 2423 int minmtupolicy, preftemp; 2424 int error; 2425 2426 if (!sticky && !cmsg) { 2427 #ifdef DIAGNOSTIC 2428 printf("ip6_setpktopt: impossible case\n"); 2429 #endif 2430 return (EINVAL); 2431 } 2432 2433 /* 2434 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2435 * not be specified in the context of RFC3542. Conversely, 2436 * RFC3542 types should not be specified in the context of RFC2292. 2437 */ 2438 if (!cmsg) { 2439 switch (optname) { 2440 case IPV6_2292PKTINFO: 2441 case IPV6_2292HOPLIMIT: 2442 case IPV6_2292NEXTHOP: 2443 case IPV6_2292HOPOPTS: 2444 case IPV6_2292DSTOPTS: 2445 case IPV6_2292RTHDR: 2446 case IPV6_2292PKTOPTIONS: 2447 return (ENOPROTOOPT); 2448 } 2449 } 2450 if (sticky && cmsg) { 2451 switch (optname) { 2452 case IPV6_PKTINFO: 2453 case IPV6_HOPLIMIT: 2454 case IPV6_NEXTHOP: 2455 case IPV6_HOPOPTS: 2456 case IPV6_DSTOPTS: 2457 case IPV6_RTHDRDSTOPTS: 2458 case IPV6_RTHDR: 2459 case IPV6_USE_MIN_MTU: 2460 case IPV6_DONTFRAG: 2461 case IPV6_TCLASS: 2462 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2463 return (ENOPROTOOPT); 2464 } 2465 } 2466 2467 switch (optname) { 2468 case IPV6_2292PKTINFO: 2469 case IPV6_PKTINFO: 2470 { 2471 struct ifnet *ifp = NULL; 2472 struct in6_pktinfo *pktinfo; 2473 2474 if (len != sizeof(struct in6_pktinfo)) 2475 return (EINVAL); 2476 2477 pktinfo = (struct in6_pktinfo *)buf; 2478 2479 /* 2480 * An application can clear any sticky IPV6_PKTINFO option by 2481 * doing a "regular" setsockopt with ipi6_addr being 2482 * in6addr_any and ipi6_ifindex being zero. 2483 * [RFC 3542, Section 6] 2484 */ 2485 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2486 pktinfo->ipi6_ifindex == 0 && 2487 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2488 ip6_clearpktopts(opt, optname); 2489 break; 2490 } 2491 2492 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2493 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2494 return (EINVAL); 2495 } 2496 2497 /* validate the interface index if specified. */ 2498 if (pktinfo->ipi6_ifindex > V_if_index || 2499 pktinfo->ipi6_ifindex < 0) { 2500 return (ENXIO); 2501 } 2502 if (pktinfo->ipi6_ifindex) { 2503 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2504 if (ifp == NULL) 2505 return (ENXIO); 2506 } 2507 2508 /* 2509 * We store the address anyway, and let in6_selectsrc() 2510 * validate the specified address. This is because ipi6_addr 2511 * may not have enough information about its scope zone, and 2512 * we may need additional information (such as outgoing 2513 * interface or the scope zone of a destination address) to 2514 * disambiguate the scope. 2515 * XXX: the delay of the validation may confuse the 2516 * application when it is used as a sticky option. 2517 */ 2518 if (opt->ip6po_pktinfo == NULL) { 2519 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2520 M_IP6OPT, M_NOWAIT); 2521 if (opt->ip6po_pktinfo == NULL) 2522 return (ENOBUFS); 2523 } 2524 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2525 break; 2526 } 2527 2528 case IPV6_2292HOPLIMIT: 2529 case IPV6_HOPLIMIT: 2530 { 2531 int *hlimp; 2532 2533 /* 2534 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2535 * to simplify the ordering among hoplimit options. 2536 */ 2537 if (optname == IPV6_HOPLIMIT && sticky) 2538 return (ENOPROTOOPT); 2539 2540 if (len != sizeof(int)) 2541 return (EINVAL); 2542 hlimp = (int *)buf; 2543 if (*hlimp < -1 || *hlimp > 255) 2544 return (EINVAL); 2545 2546 opt->ip6po_hlim = *hlimp; 2547 break; 2548 } 2549 2550 case IPV6_TCLASS: 2551 { 2552 int tclass; 2553 2554 if (len != sizeof(int)) 2555 return (EINVAL); 2556 tclass = *(int *)buf; 2557 if (tclass < -1 || tclass > 255) 2558 return (EINVAL); 2559 2560 opt->ip6po_tclass = tclass; 2561 break; 2562 } 2563 2564 case IPV6_2292NEXTHOP: 2565 case IPV6_NEXTHOP: 2566 if (cred != NULL) { 2567 error = priv_check_cred(cred, 2568 PRIV_NETINET_SETHDROPTS, 0); 2569 if (error) 2570 return (error); 2571 } 2572 2573 if (len == 0) { /* just remove the option */ 2574 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2575 break; 2576 } 2577 2578 /* check if cmsg_len is large enough for sa_len */ 2579 if (len < sizeof(struct sockaddr) || len < *buf) 2580 return (EINVAL); 2581 2582 switch (((struct sockaddr *)buf)->sa_family) { 2583 case AF_INET6: 2584 { 2585 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2586 int error; 2587 2588 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2589 return (EINVAL); 2590 2591 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2592 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2593 return (EINVAL); 2594 } 2595 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2596 != 0) { 2597 return (error); 2598 } 2599 break; 2600 } 2601 case AF_LINK: /* should eventually be supported */ 2602 default: 2603 return (EAFNOSUPPORT); 2604 } 2605 2606 /* turn off the previous option, then set the new option. */ 2607 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2608 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2609 if (opt->ip6po_nexthop == NULL) 2610 return (ENOBUFS); 2611 bcopy(buf, opt->ip6po_nexthop, *buf); 2612 break; 2613 2614 case IPV6_2292HOPOPTS: 2615 case IPV6_HOPOPTS: 2616 { 2617 struct ip6_hbh *hbh; 2618 int hbhlen; 2619 2620 /* 2621 * XXX: We don't allow a non-privileged user to set ANY HbH 2622 * options, since per-option restriction has too much 2623 * overhead. 2624 */ 2625 if (cred != NULL) { 2626 error = priv_check_cred(cred, 2627 PRIV_NETINET_SETHDROPTS, 0); 2628 if (error) 2629 return (error); 2630 } 2631 2632 if (len == 0) { 2633 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2634 break; /* just remove the option */ 2635 } 2636 2637 /* message length validation */ 2638 if (len < sizeof(struct ip6_hbh)) 2639 return (EINVAL); 2640 hbh = (struct ip6_hbh *)buf; 2641 hbhlen = (hbh->ip6h_len + 1) << 3; 2642 if (len != hbhlen) 2643 return (EINVAL); 2644 2645 /* turn off the previous option, then set the new option. */ 2646 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2647 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2648 if (opt->ip6po_hbh == NULL) 2649 return (ENOBUFS); 2650 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2651 2652 break; 2653 } 2654 2655 case IPV6_2292DSTOPTS: 2656 case IPV6_DSTOPTS: 2657 case IPV6_RTHDRDSTOPTS: 2658 { 2659 struct ip6_dest *dest, **newdest = NULL; 2660 int destlen; 2661 2662 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2663 error = priv_check_cred(cred, 2664 PRIV_NETINET_SETHDROPTS, 0); 2665 if (error) 2666 return (error); 2667 } 2668 2669 if (len == 0) { 2670 ip6_clearpktopts(opt, optname); 2671 break; /* just remove the option */ 2672 } 2673 2674 /* message length validation */ 2675 if (len < sizeof(struct ip6_dest)) 2676 return (EINVAL); 2677 dest = (struct ip6_dest *)buf; 2678 destlen = (dest->ip6d_len + 1) << 3; 2679 if (len != destlen) 2680 return (EINVAL); 2681 2682 /* 2683 * Determine the position that the destination options header 2684 * should be inserted; before or after the routing header. 2685 */ 2686 switch (optname) { 2687 case IPV6_2292DSTOPTS: 2688 /* 2689 * The old advacned API is ambiguous on this point. 2690 * Our approach is to determine the position based 2691 * according to the existence of a routing header. 2692 * Note, however, that this depends on the order of the 2693 * extension headers in the ancillary data; the 1st 2694 * part of the destination options header must appear 2695 * before the routing header in the ancillary data, 2696 * too. 2697 * RFC3542 solved the ambiguity by introducing 2698 * separate ancillary data or option types. 2699 */ 2700 if (opt->ip6po_rthdr == NULL) 2701 newdest = &opt->ip6po_dest1; 2702 else 2703 newdest = &opt->ip6po_dest2; 2704 break; 2705 case IPV6_RTHDRDSTOPTS: 2706 newdest = &opt->ip6po_dest1; 2707 break; 2708 case IPV6_DSTOPTS: 2709 newdest = &opt->ip6po_dest2; 2710 break; 2711 } 2712 2713 /* turn off the previous option, then set the new option. */ 2714 ip6_clearpktopts(opt, optname); 2715 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2716 if (*newdest == NULL) 2717 return (ENOBUFS); 2718 bcopy(dest, *newdest, destlen); 2719 2720 break; 2721 } 2722 2723 case IPV6_2292RTHDR: 2724 case IPV6_RTHDR: 2725 { 2726 struct ip6_rthdr *rth; 2727 int rthlen; 2728 2729 if (len == 0) { 2730 ip6_clearpktopts(opt, IPV6_RTHDR); 2731 break; /* just remove the option */ 2732 } 2733 2734 /* message length validation */ 2735 if (len < sizeof(struct ip6_rthdr)) 2736 return (EINVAL); 2737 rth = (struct ip6_rthdr *)buf; 2738 rthlen = (rth->ip6r_len + 1) << 3; 2739 if (len != rthlen) 2740 return (EINVAL); 2741 2742 switch (rth->ip6r_type) { 2743 case IPV6_RTHDR_TYPE_0: 2744 if (rth->ip6r_len == 0) /* must contain one addr */ 2745 return (EINVAL); 2746 if (rth->ip6r_len % 2) /* length must be even */ 2747 return (EINVAL); 2748 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2749 return (EINVAL); 2750 break; 2751 default: 2752 return (EINVAL); /* not supported */ 2753 } 2754 2755 /* turn off the previous option */ 2756 ip6_clearpktopts(opt, IPV6_RTHDR); 2757 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2758 if (opt->ip6po_rthdr == NULL) 2759 return (ENOBUFS); 2760 bcopy(rth, opt->ip6po_rthdr, rthlen); 2761 2762 break; 2763 } 2764 2765 case IPV6_USE_MIN_MTU: 2766 if (len != sizeof(int)) 2767 return (EINVAL); 2768 minmtupolicy = *(int *)buf; 2769 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2770 minmtupolicy != IP6PO_MINMTU_DISABLE && 2771 minmtupolicy != IP6PO_MINMTU_ALL) { 2772 return (EINVAL); 2773 } 2774 opt->ip6po_minmtu = minmtupolicy; 2775 break; 2776 2777 case IPV6_DONTFRAG: 2778 if (len != sizeof(int)) 2779 return (EINVAL); 2780 2781 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2782 /* 2783 * we ignore this option for TCP sockets. 2784 * (RFC3542 leaves this case unspecified.) 2785 */ 2786 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2787 } else 2788 opt->ip6po_flags |= IP6PO_DONTFRAG; 2789 break; 2790 2791 case IPV6_PREFER_TEMPADDR: 2792 if (len != sizeof(int)) 2793 return (EINVAL); 2794 preftemp = *(int *)buf; 2795 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2796 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2797 preftemp != IP6PO_TEMPADDR_PREFER) { 2798 return (EINVAL); 2799 } 2800 opt->ip6po_prefer_tempaddr = preftemp; 2801 break; 2802 2803 default: 2804 return (ENOPROTOOPT); 2805 } /* end of switch */ 2806 2807 return (0); 2808 } 2809 2810 /* 2811 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2812 * packet to the input queue of a specified interface. Note that this 2813 * calls the output routine of the loopback "driver", but with an interface 2814 * pointer that might NOT be &loif -- easier than replicating that code here. 2815 */ 2816 void 2817 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2818 { 2819 struct mbuf *copym; 2820 struct ip6_hdr *ip6; 2821 2822 copym = m_copy(m, 0, M_COPYALL); 2823 if (copym == NULL) 2824 return; 2825 2826 /* 2827 * Make sure to deep-copy IPv6 header portion in case the data 2828 * is in an mbuf cluster, so that we can safely override the IPv6 2829 * header portion later. 2830 */ 2831 if ((copym->m_flags & M_EXT) != 0 || 2832 copym->m_len < sizeof(struct ip6_hdr)) { 2833 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2834 if (copym == NULL) 2835 return; 2836 } 2837 ip6 = mtod(copym, struct ip6_hdr *); 2838 /* 2839 * clear embedded scope identifiers if necessary. 2840 * in6_clearscope will touch the addresses only when necessary. 2841 */ 2842 in6_clearscope(&ip6->ip6_src); 2843 in6_clearscope(&ip6->ip6_dst); 2844 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 2845 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 2846 CSUM_PSEUDO_HDR; 2847 copym->m_pkthdr.csum_data = 0xffff; 2848 } 2849 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2850 } 2851 2852 /* 2853 * Chop IPv6 header off from the payload. 2854 */ 2855 static int 2856 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2857 { 2858 struct mbuf *mh; 2859 struct ip6_hdr *ip6; 2860 2861 ip6 = mtod(m, struct ip6_hdr *); 2862 if (m->m_len > sizeof(*ip6)) { 2863 mh = m_gethdr(M_NOWAIT, MT_DATA); 2864 if (mh == NULL) { 2865 m_freem(m); 2866 return ENOBUFS; 2867 } 2868 m_move_pkthdr(mh, m); 2869 MH_ALIGN(mh, sizeof(*ip6)); 2870 m->m_len -= sizeof(*ip6); 2871 m->m_data += sizeof(*ip6); 2872 mh->m_next = m; 2873 m = mh; 2874 m->m_len = sizeof(*ip6); 2875 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2876 } 2877 exthdrs->ip6e_ip6 = m; 2878 return 0; 2879 } 2880 2881 /* 2882 * Compute IPv6 extension header length. 2883 */ 2884 int 2885 ip6_optlen(struct inpcb *in6p) 2886 { 2887 int len; 2888 2889 if (!in6p->in6p_outputopts) 2890 return 0; 2891 2892 len = 0; 2893 #define elen(x) \ 2894 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2895 2896 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2897 if (in6p->in6p_outputopts->ip6po_rthdr) 2898 /* dest1 is valid with rthdr only */ 2899 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2900 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2901 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2902 return len; 2903 #undef elen 2904 }
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