ip6_output.c revision 282894
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: stable/10/sys/netinet6/ip6_output.c 282894 2015-05-14 11:47:18Z ae $"); 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 123extern int in6_mcast_loop; 124 125struct 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 133static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 134 struct ucred *, int); 135static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 136 struct socket *, struct sockopt *); 137static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 138static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 139 struct ucred *, int, int, int); 140 141static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 142static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 143 struct ip6_frag **); 144static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 145static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 146static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, 147 struct ifnet *, struct in6_addr *, u_long *, int *, u_int); 148static 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 187void 188in6_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/* 212 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 213 * header (with pri, len, nxt, hlim, src, dst). 214 * This function may modify ver and hlim only. 215 * The mbuf chain containing the packet will be freed. 216 * The mbuf opt, if present, will not be freed. 217 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 218 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 219 * then result of route lookup is stored in ro->ro_rt. 220 * 221 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 222 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 223 * which is rt_mtu. 224 * 225 * ifpp - XXX: just for statistics 226 */ 227int 228ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 229 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 230 struct ifnet **ifpp, struct inpcb *inp) 231{ 232 struct ip6_hdr *ip6, *mhip6; 233 struct ifnet *ifp, *origifp; 234 struct mbuf *m = m0; 235 struct mbuf *mprev = NULL; 236 int hlen, tlen, len, off; 237 struct route_in6 ip6route; 238 struct rtentry *rt = NULL; 239 struct sockaddr_in6 *dst, src_sa, dst_sa; 240 struct in6_addr odst; 241 int error = 0; 242 struct in6_ifaddr *ia = NULL; 243 u_long mtu; 244 int alwaysfrag, dontfrag; 245 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 246 struct ip6_exthdrs exthdrs; 247 struct in6_addr finaldst, src0, dst0; 248 u_int32_t zone; 249 struct route_in6 *ro_pmtu = NULL; 250 int hdrsplit = 0; 251 int sw_csum, tso; 252 struct m_tag *fwd_tag = NULL; 253 254 ip6 = mtod(m, struct ip6_hdr *); 255 if (ip6 == NULL) { 256 printf ("ip6 is NULL"); 257 goto bad; 258 } 259 260 if (inp != NULL) 261 M_SETFIB(m, inp->inp_inc.inc_fibnum); 262 263 finaldst = ip6->ip6_dst; 264 bzero(&exthdrs, sizeof(exthdrs)); 265 if (opt) { 266 /* Hop-by-Hop options header */ 267 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 268 /* Destination options header(1st part) */ 269 if (opt->ip6po_rthdr) { 270 /* 271 * Destination options header(1st part) 272 * This only makes sense with a routing header. 273 * See Section 9.2 of RFC 3542. 274 * Disabling this part just for MIP6 convenience is 275 * a bad idea. We need to think carefully about a 276 * way to make the advanced API coexist with MIP6 277 * options, which might automatically be inserted in 278 * the kernel. 279 */ 280 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 281 } 282 /* Routing header */ 283 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 284 /* Destination options header(2nd part) */ 285 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 286 } 287 288#ifdef IPSEC 289 /* 290 * IPSec checking which handles several cases. 291 * FAST IPSEC: We re-injected the packet. 292 */ 293 switch(ip6_ipsec_output(&m, inp, &flags, &error, &ifp)) 294 { 295 case 1: /* Bad packet */ 296 goto freehdrs; 297 case -1: /* IPSec done */ 298 goto done; 299 case 0: /* No IPSec */ 300 default: 301 break; 302 } 303#endif /* IPSEC */ 304 305 /* 306 * Calculate the total length of the extension header chain. 307 * Keep the length of the unfragmentable part for fragmentation. 308 */ 309 optlen = 0; 310 if (exthdrs.ip6e_hbh) 311 optlen += exthdrs.ip6e_hbh->m_len; 312 if (exthdrs.ip6e_dest1) 313 optlen += exthdrs.ip6e_dest1->m_len; 314 if (exthdrs.ip6e_rthdr) 315 optlen += exthdrs.ip6e_rthdr->m_len; 316 unfragpartlen = optlen + sizeof(struct ip6_hdr); 317 318 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 319 if (exthdrs.ip6e_dest2) 320 optlen += exthdrs.ip6e_dest2->m_len; 321 322 /* 323 * If there is at least one extension header, 324 * separate IP6 header from the payload. 325 */ 326 if (optlen && !hdrsplit) { 327 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 328 m = NULL; 329 goto freehdrs; 330 } 331 m = exthdrs.ip6e_ip6; 332 hdrsplit++; 333 } 334 335 /* adjust pointer */ 336 ip6 = mtod(m, struct ip6_hdr *); 337 338 /* adjust mbuf packet header length */ 339 m->m_pkthdr.len += optlen; 340 plen = m->m_pkthdr.len - sizeof(*ip6); 341 342 /* If this is a jumbo payload, insert a jumbo payload option. */ 343 if (plen > IPV6_MAXPACKET) { 344 if (!hdrsplit) { 345 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 346 m = NULL; 347 goto freehdrs; 348 } 349 m = exthdrs.ip6e_ip6; 350 hdrsplit++; 351 } 352 /* adjust pointer */ 353 ip6 = mtod(m, struct ip6_hdr *); 354 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 355 goto freehdrs; 356 ip6->ip6_plen = 0; 357 } else 358 ip6->ip6_plen = htons(plen); 359 360 /* 361 * Concatenate headers and fill in next header fields. 362 * Here we have, on "m" 363 * IPv6 payload 364 * and we insert headers accordingly. Finally, we should be getting: 365 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 366 * 367 * during the header composing process, "m" points to IPv6 header. 368 * "mprev" points to an extension header prior to esp. 369 */ 370 u_char *nexthdrp = &ip6->ip6_nxt; 371 mprev = m; 372 373 /* 374 * we treat dest2 specially. this makes IPsec processing 375 * much easier. the goal here is to make mprev point the 376 * mbuf prior to dest2. 377 * 378 * result: IPv6 dest2 payload 379 * m and mprev will point to IPv6 header. 380 */ 381 if (exthdrs.ip6e_dest2) { 382 if (!hdrsplit) 383 panic("assumption failed: hdr not split"); 384 exthdrs.ip6e_dest2->m_next = m->m_next; 385 m->m_next = exthdrs.ip6e_dest2; 386 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 387 ip6->ip6_nxt = IPPROTO_DSTOPTS; 388 } 389 390 /* 391 * result: IPv6 hbh dest1 rthdr dest2 payload 392 * m will point to IPv6 header. mprev will point to the 393 * extension header prior to dest2 (rthdr in the above case). 394 */ 395 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 396 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 397 IPPROTO_DSTOPTS); 398 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 399 IPPROTO_ROUTING); 400 401 /* 402 * If there is a routing header, discard the packet. 403 */ 404 if (exthdrs.ip6e_rthdr) { 405 error = EINVAL; 406 goto bad; 407 } 408 409 /* Source address validation */ 410 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 411 (flags & IPV6_UNSPECSRC) == 0) { 412 error = EOPNOTSUPP; 413 IP6STAT_INC(ip6s_badscope); 414 goto bad; 415 } 416 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 417 error = EOPNOTSUPP; 418 IP6STAT_INC(ip6s_badscope); 419 goto bad; 420 } 421 422 IP6STAT_INC(ip6s_localout); 423 424 /* 425 * Route packet. 426 */ 427 if (ro == 0) { 428 ro = &ip6route; 429 bzero((caddr_t)ro, sizeof(*ro)); 430 } 431 ro_pmtu = ro; 432 if (opt && opt->ip6po_rthdr) 433 ro = &opt->ip6po_route; 434 dst = (struct sockaddr_in6 *)&ro->ro_dst; 435#ifdef FLOWTABLE 436 if (ro->ro_rt == NULL) 437 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 438#endif 439again: 440 /* 441 * if specified, try to fill in the traffic class field. 442 * do not override if a non-zero value is already set. 443 * we check the diffserv field and the ecn field separately. 444 */ 445 if (opt && opt->ip6po_tclass >= 0) { 446 int mask = 0; 447 448 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 449 mask |= 0xfc; 450 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 451 mask |= 0x03; 452 if (mask != 0) 453 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 454 } 455 456 /* fill in or override the hop limit field, if necessary. */ 457 if (opt && opt->ip6po_hlim != -1) 458 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 459 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 460 if (im6o != NULL) 461 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 462 else 463 ip6->ip6_hlim = V_ip6_defmcasthlim; 464 } 465 466 /* adjust pointer */ 467 ip6 = mtod(m, struct ip6_hdr *); 468 469 if (ro->ro_rt && fwd_tag == NULL) { 470 rt = ro->ro_rt; 471 ifp = ro->ro_rt->rt_ifp; 472 } else { 473 if (fwd_tag == NULL) { 474 bzero(&dst_sa, sizeof(dst_sa)); 475 dst_sa.sin6_family = AF_INET6; 476 dst_sa.sin6_len = sizeof(dst_sa); 477 dst_sa.sin6_addr = ip6->ip6_dst; 478 } 479 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 480 &rt, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m)); 481 if (error != 0) { 482 if (ifp != NULL) 483 in6_ifstat_inc(ifp, ifs6_out_discard); 484 goto bad; 485 } 486 } 487 if (rt == NULL) { 488 /* 489 * If in6_selectroute() does not return a route entry, 490 * dst may not have been updated. 491 */ 492 *dst = dst_sa; /* XXX */ 493 } 494 495 /* 496 * then rt (for unicast) and ifp must be non-NULL valid values. 497 */ 498 if ((flags & IPV6_FORWARDING) == 0) { 499 /* XXX: the FORWARDING flag can be set for mrouting. */ 500 in6_ifstat_inc(ifp, ifs6_out_request); 501 } 502 if (rt != NULL) { 503 ia = (struct in6_ifaddr *)(rt->rt_ifa); 504 counter_u64_add(rt->rt_pksent, 1); 505 } 506 507 508 /* 509 * The outgoing interface must be in the zone of source and 510 * destination addresses. 511 */ 512 origifp = ifp; 513 514 src0 = ip6->ip6_src; 515 if (in6_setscope(&src0, origifp, &zone)) 516 goto badscope; 517 bzero(&src_sa, sizeof(src_sa)); 518 src_sa.sin6_family = AF_INET6; 519 src_sa.sin6_len = sizeof(src_sa); 520 src_sa.sin6_addr = ip6->ip6_src; 521 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 522 goto badscope; 523 524 dst0 = ip6->ip6_dst; 525 if (in6_setscope(&dst0, origifp, &zone)) 526 goto badscope; 527 /* re-initialize to be sure */ 528 bzero(&dst_sa, sizeof(dst_sa)); 529 dst_sa.sin6_family = AF_INET6; 530 dst_sa.sin6_len = sizeof(dst_sa); 531 dst_sa.sin6_addr = ip6->ip6_dst; 532 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 533 goto badscope; 534 } 535 536 /* We should use ia_ifp to support the case of 537 * sending packets to an address of our own. 538 */ 539 if (ia != NULL && ia->ia_ifp) 540 ifp = ia->ia_ifp; 541 542 /* scope check is done. */ 543 goto routefound; 544 545 badscope: 546 IP6STAT_INC(ip6s_badscope); 547 in6_ifstat_inc(origifp, ifs6_out_discard); 548 if (error == 0) 549 error = EHOSTUNREACH; /* XXX */ 550 goto bad; 551 552 routefound: 553 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 554 if (opt && opt->ip6po_nextroute.ro_rt) { 555 /* 556 * The nexthop is explicitly specified by the 557 * application. We assume the next hop is an IPv6 558 * address. 559 */ 560 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 561 } 562 else if ((rt->rt_flags & RTF_GATEWAY)) 563 dst = (struct sockaddr_in6 *)rt->rt_gateway; 564 } 565 566 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 567 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 568 } else { 569 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 570 in6_ifstat_inc(ifp, ifs6_out_mcast); 571 /* 572 * Confirm that the outgoing interface supports multicast. 573 */ 574 if (!(ifp->if_flags & IFF_MULTICAST)) { 575 IP6STAT_INC(ip6s_noroute); 576 in6_ifstat_inc(ifp, ifs6_out_discard); 577 error = ENETUNREACH; 578 goto bad; 579 } 580 if ((im6o == NULL && in6_mcast_loop) || 581 (im6o && im6o->im6o_multicast_loop)) { 582 /* 583 * Loop back multicast datagram if not expressly 584 * forbidden to do so, even if we have not joined 585 * the address; protocols will filter it later, 586 * thus deferring a hash lookup and lock acquisition 587 * at the expense of an m_copym(). 588 */ 589 ip6_mloopback(ifp, m, dst); 590 } else { 591 /* 592 * If we are acting as a multicast router, perform 593 * multicast forwarding as if the packet had just 594 * arrived on the interface to which we are about 595 * to send. The multicast forwarding function 596 * recursively calls this function, using the 597 * IPV6_FORWARDING flag to prevent infinite recursion. 598 * 599 * Multicasts that are looped back by ip6_mloopback(), 600 * above, will be forwarded by the ip6_input() routine, 601 * if necessary. 602 */ 603 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 604 /* 605 * XXX: ip6_mforward expects that rcvif is NULL 606 * when it is called from the originating path. 607 * However, it may not always be the case. 608 */ 609 m->m_pkthdr.rcvif = NULL; 610 if (ip6_mforward(ip6, ifp, m) != 0) { 611 m_freem(m); 612 goto done; 613 } 614 } 615 } 616 /* 617 * Multicasts with a hoplimit of zero may be looped back, 618 * above, but must not be transmitted on a network. 619 * Also, multicasts addressed to the loopback interface 620 * are not sent -- the above call to ip6_mloopback() will 621 * loop back a copy if this host actually belongs to the 622 * destination group on the loopback interface. 623 */ 624 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 625 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 626 m_freem(m); 627 goto done; 628 } 629 } 630 631 /* 632 * Fill the outgoing inteface to tell the upper layer 633 * to increment per-interface statistics. 634 */ 635 if (ifpp) 636 *ifpp = ifp; 637 638 /* Determine path MTU. */ 639 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 640 &alwaysfrag, inp ? inp->inp_inc.inc_fibnum : M_GETFIB(m))) != 0) 641 goto bad; 642 643 /* 644 * The caller of this function may specify to use the minimum MTU 645 * in some cases. 646 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 647 * setting. The logic is a bit complicated; by default, unicast 648 * packets will follow path MTU while multicast packets will be sent at 649 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 650 * including unicast ones will be sent at the minimum MTU. Multicast 651 * packets will always be sent at the minimum MTU unless 652 * IP6PO_MINMTU_DISABLE is explicitly specified. 653 * See RFC 3542 for more details. 654 */ 655 if (mtu > IPV6_MMTU) { 656 if ((flags & IPV6_MINMTU)) 657 mtu = IPV6_MMTU; 658 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 659 mtu = IPV6_MMTU; 660 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 661 (opt == NULL || 662 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 663 mtu = IPV6_MMTU; 664 } 665 } 666 667 /* 668 * clear embedded scope identifiers if necessary. 669 * in6_clearscope will touch the addresses only when necessary. 670 */ 671 in6_clearscope(&ip6->ip6_src); 672 in6_clearscope(&ip6->ip6_dst); 673 674 /* 675 * If the outgoing packet contains a hop-by-hop options header, 676 * it must be examined and processed even by the source node. 677 * (RFC 2460, section 4.) 678 */ 679 if (exthdrs.ip6e_hbh) { 680 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 681 u_int32_t dummy; /* XXX unused */ 682 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 683 684#ifdef DIAGNOSTIC 685 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 686 panic("ip6e_hbh is not contiguous"); 687#endif 688 /* 689 * XXX: if we have to send an ICMPv6 error to the sender, 690 * we need the M_LOOP flag since icmp6_error() expects 691 * the IPv6 and the hop-by-hop options header are 692 * contiguous unless the flag is set. 693 */ 694 m->m_flags |= M_LOOP; 695 m->m_pkthdr.rcvif = ifp; 696 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 697 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 698 &dummy, &plen) < 0) { 699 /* m was already freed at this point */ 700 error = EINVAL;/* better error? */ 701 goto done; 702 } 703 m->m_flags &= ~M_LOOP; /* XXX */ 704 m->m_pkthdr.rcvif = NULL; 705 } 706 707 /* Jump over all PFIL processing if hooks are not active. */ 708 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 709 goto passout; 710 711 odst = ip6->ip6_dst; 712 /* Run through list of hooks for output packets. */ 713 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 714 if (error != 0 || m == NULL) 715 goto done; 716 ip6 = mtod(m, struct ip6_hdr *); 717 718 /* See if destination IP address was changed by packet filter. */ 719 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 720 m->m_flags |= M_SKIP_FIREWALL; 721 /* If destination is now ourself drop to ip6_input(). */ 722 if (in6_localip(&ip6->ip6_dst)) { 723 m->m_flags |= M_FASTFWD_OURS; 724 if (m->m_pkthdr.rcvif == NULL) 725 m->m_pkthdr.rcvif = V_loif; 726 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 727 m->m_pkthdr.csum_flags |= 728 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 729 m->m_pkthdr.csum_data = 0xffff; 730 } 731#ifdef SCTP 732 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 733 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 734#endif 735 error = netisr_queue(NETISR_IPV6, m); 736 goto done; 737 } else 738 goto again; /* Redo the routing table lookup. */ 739 } 740 741 /* See if local, if yes, send it to netisr. */ 742 if (m->m_flags & M_FASTFWD_OURS) { 743 if (m->m_pkthdr.rcvif == NULL) 744 m->m_pkthdr.rcvif = V_loif; 745 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 746 m->m_pkthdr.csum_flags |= 747 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 748 m->m_pkthdr.csum_data = 0xffff; 749 } 750#ifdef SCTP 751 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 752 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 753#endif 754 error = netisr_queue(NETISR_IPV6, m); 755 goto done; 756 } 757 /* Or forward to some other address? */ 758 if ((m->m_flags & M_IP6_NEXTHOP) && 759 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 760 dst = (struct sockaddr_in6 *)&ro->ro_dst; 761 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 762 m->m_flags |= M_SKIP_FIREWALL; 763 m->m_flags &= ~M_IP6_NEXTHOP; 764 m_tag_delete(m, fwd_tag); 765 goto again; 766 } 767 768passout: 769 /* 770 * Send the packet to the outgoing interface. 771 * If necessary, do IPv6 fragmentation before sending. 772 * 773 * the logic here is rather complex: 774 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 775 * 1-a: send as is if tlen <= path mtu 776 * 1-b: fragment if tlen > path mtu 777 * 778 * 2: if user asks us not to fragment (dontfrag == 1) 779 * 2-a: send as is if tlen <= interface mtu 780 * 2-b: error if tlen > interface mtu 781 * 782 * 3: if we always need to attach fragment header (alwaysfrag == 1) 783 * always fragment 784 * 785 * 4: if dontfrag == 1 && alwaysfrag == 1 786 * error, as we cannot handle this conflicting request 787 */ 788 sw_csum = m->m_pkthdr.csum_flags; 789 if (!hdrsplit) { 790 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 791 sw_csum &= ~ifp->if_hwassist; 792 } else 793 tso = 0; 794 /* 795 * If we added extension headers, we will not do TSO and calculate the 796 * checksums ourselves for now. 797 * XXX-BZ Need a framework to know when the NIC can handle it, even 798 * with ext. hdrs. 799 */ 800 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 801 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 802 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 803 } 804#ifdef SCTP 805 if (sw_csum & CSUM_SCTP_IPV6) { 806 sw_csum &= ~CSUM_SCTP_IPV6; 807 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 808 } 809#endif 810 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 811 tlen = m->m_pkthdr.len; 812 813 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 814 dontfrag = 1; 815 else 816 dontfrag = 0; 817 if (dontfrag && alwaysfrag) { /* case 4 */ 818 /* conflicting request - can't transmit */ 819 error = EMSGSIZE; 820 goto bad; 821 } 822 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 823 /* 824 * Even if the DONTFRAG option is specified, we cannot send the 825 * packet when the data length is larger than the MTU of the 826 * outgoing interface. 827 * Notify the error by sending IPV6_PATHMTU ancillary data if 828 * application wanted to know the MTU value. Also return an 829 * error code (this is not described in the API spec). 830 */ 831 if (inp != NULL) 832 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 833 error = EMSGSIZE; 834 goto bad; 835 } 836 837 /* 838 * transmit packet without fragmentation 839 */ 840 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 841 struct in6_ifaddr *ia6; 842 843 ip6 = mtod(m, struct ip6_hdr *); 844 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 845 if (ia6) { 846 /* Record statistics for this interface address. */ 847 ia6->ia_ifa.if_opackets++; 848 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 849 ifa_free(&ia6->ia_ifa); 850 } 851 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 852 goto done; 853 } 854 855 /* 856 * try to fragment the packet. case 1-b and 3 857 */ 858 if (mtu < IPV6_MMTU) { 859 /* path MTU cannot be less than IPV6_MMTU */ 860 error = EMSGSIZE; 861 in6_ifstat_inc(ifp, ifs6_out_fragfail); 862 goto bad; 863 } else if (ip6->ip6_plen == 0) { 864 /* jumbo payload cannot be fragmented */ 865 error = EMSGSIZE; 866 in6_ifstat_inc(ifp, ifs6_out_fragfail); 867 goto bad; 868 } else { 869 struct mbuf **mnext, *m_frgpart; 870 struct ip6_frag *ip6f; 871 u_int32_t id = htonl(ip6_randomid()); 872 u_char nextproto; 873 874 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 875 876 /* 877 * Too large for the destination or interface; 878 * fragment if possible. 879 * Must be able to put at least 8 bytes per fragment. 880 */ 881 hlen = unfragpartlen; 882 if (mtu > IPV6_MAXPACKET) 883 mtu = IPV6_MAXPACKET; 884 885 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 886 if (len < 8) { 887 error = EMSGSIZE; 888 in6_ifstat_inc(ifp, ifs6_out_fragfail); 889 goto bad; 890 } 891 892 /* 893 * Verify that we have any chance at all of being able to queue 894 * the packet or packet fragments 895 */ 896 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 897 < tlen /* - hlen */)) { 898 error = ENOBUFS; 899 IP6STAT_INC(ip6s_odropped); 900 goto bad; 901 } 902 903 904 /* 905 * If the interface will not calculate checksums on 906 * fragmented packets, then do it here. 907 * XXX-BZ handle the hw offloading case. Need flags. 908 */ 909 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 910 in6_delayed_cksum(m, plen, hlen); 911 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 912 } 913#ifdef SCTP 914 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 915 sctp_delayed_cksum(m, hlen); 916 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 917 } 918#endif 919 mnext = &m->m_nextpkt; 920 921 /* 922 * Change the next header field of the last header in the 923 * unfragmentable part. 924 */ 925 if (exthdrs.ip6e_rthdr) { 926 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 927 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 928 } else if (exthdrs.ip6e_dest1) { 929 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 930 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 931 } else if (exthdrs.ip6e_hbh) { 932 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 933 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 934 } else { 935 nextproto = ip6->ip6_nxt; 936 ip6->ip6_nxt = IPPROTO_FRAGMENT; 937 } 938 939 /* 940 * Loop through length of segment after first fragment, 941 * make new header and copy data of each part and link onto 942 * chain. 943 */ 944 m0 = m; 945 for (off = hlen; off < tlen; off += len) { 946 m = m_gethdr(M_NOWAIT, MT_DATA); 947 if (!m) { 948 error = ENOBUFS; 949 IP6STAT_INC(ip6s_odropped); 950 goto sendorfree; 951 } 952 m->m_flags = m0->m_flags & M_COPYFLAGS; 953 *mnext = m; 954 mnext = &m->m_nextpkt; 955 m->m_data += max_linkhdr; 956 mhip6 = mtod(m, struct ip6_hdr *); 957 *mhip6 = *ip6; 958 m->m_len = sizeof(*mhip6); 959 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 960 if (error) { 961 IP6STAT_INC(ip6s_odropped); 962 goto sendorfree; 963 } 964 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 965 if (off + len >= tlen) 966 len = tlen - off; 967 else 968 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 969 mhip6->ip6_plen = htons((u_short)(len + hlen + 970 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 971 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 972 error = ENOBUFS; 973 IP6STAT_INC(ip6s_odropped); 974 goto sendorfree; 975 } 976 m_cat(m, m_frgpart); 977 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 978 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 979 m->m_pkthdr.rcvif = NULL; 980 ip6f->ip6f_reserved = 0; 981 ip6f->ip6f_ident = id; 982 ip6f->ip6f_nxt = nextproto; 983 IP6STAT_INC(ip6s_ofragments); 984 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 985 } 986 987 in6_ifstat_inc(ifp, ifs6_out_fragok); 988 } 989 990 /* 991 * Remove leading garbages. 992 */ 993sendorfree: 994 m = m0->m_nextpkt; 995 m0->m_nextpkt = 0; 996 m_freem(m0); 997 for (m0 = m; m; m = m0) { 998 m0 = m->m_nextpkt; 999 m->m_nextpkt = 0; 1000 if (error == 0) { 1001 /* Record statistics for this interface address. */ 1002 if (ia) { 1003 ia->ia_ifa.if_opackets++; 1004 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1005 } 1006 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1007 } else 1008 m_freem(m); 1009 } 1010 1011 if (error == 0) 1012 IP6STAT_INC(ip6s_fragmented); 1013 1014done: 1015 if (ro == &ip6route) 1016 RO_RTFREE(ro); 1017 if (ro_pmtu == &ip6route) 1018 RO_RTFREE(ro_pmtu); 1019 return (error); 1020 1021freehdrs: 1022 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1023 m_freem(exthdrs.ip6e_dest1); 1024 m_freem(exthdrs.ip6e_rthdr); 1025 m_freem(exthdrs.ip6e_dest2); 1026 /* FALLTHROUGH */ 1027bad: 1028 if (m) 1029 m_freem(m); 1030 goto done; 1031} 1032 1033static int 1034ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1035{ 1036 struct mbuf *m; 1037 1038 if (hlen > MCLBYTES) 1039 return (ENOBUFS); /* XXX */ 1040 1041 if (hlen > MLEN) 1042 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1043 else 1044 m = m_get(M_NOWAIT, MT_DATA); 1045 if (m == NULL) 1046 return (ENOBUFS); 1047 m->m_len = hlen; 1048 if (hdr) 1049 bcopy(hdr, mtod(m, caddr_t), hlen); 1050 1051 *mp = m; 1052 return (0); 1053} 1054 1055/* 1056 * Insert jumbo payload option. 1057 */ 1058static int 1059ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1060{ 1061 struct mbuf *mopt; 1062 u_char *optbuf; 1063 u_int32_t v; 1064 1065#define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1066 1067 /* 1068 * If there is no hop-by-hop options header, allocate new one. 1069 * If there is one but it doesn't have enough space to store the 1070 * jumbo payload option, allocate a cluster to store the whole options. 1071 * Otherwise, use it to store the options. 1072 */ 1073 if (exthdrs->ip6e_hbh == 0) { 1074 mopt = m_get(M_NOWAIT, MT_DATA); 1075 if (mopt == NULL) 1076 return (ENOBUFS); 1077 mopt->m_len = JUMBOOPTLEN; 1078 optbuf = mtod(mopt, u_char *); 1079 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1080 exthdrs->ip6e_hbh = mopt; 1081 } else { 1082 struct ip6_hbh *hbh; 1083 1084 mopt = exthdrs->ip6e_hbh; 1085 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1086 /* 1087 * XXX assumption: 1088 * - exthdrs->ip6e_hbh is not referenced from places 1089 * other than exthdrs. 1090 * - exthdrs->ip6e_hbh is not an mbuf chain. 1091 */ 1092 int oldoptlen = mopt->m_len; 1093 struct mbuf *n; 1094 1095 /* 1096 * XXX: give up if the whole (new) hbh header does 1097 * not fit even in an mbuf cluster. 1098 */ 1099 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1100 return (ENOBUFS); 1101 1102 /* 1103 * As a consequence, we must always prepare a cluster 1104 * at this point. 1105 */ 1106 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1107 if (n == NULL) 1108 return (ENOBUFS); 1109 n->m_len = oldoptlen + JUMBOOPTLEN; 1110 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1111 oldoptlen); 1112 optbuf = mtod(n, caddr_t) + oldoptlen; 1113 m_freem(mopt); 1114 mopt = exthdrs->ip6e_hbh = n; 1115 } else { 1116 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1117 mopt->m_len += JUMBOOPTLEN; 1118 } 1119 optbuf[0] = IP6OPT_PADN; 1120 optbuf[1] = 1; 1121 1122 /* 1123 * Adjust the header length according to the pad and 1124 * the jumbo payload option. 1125 */ 1126 hbh = mtod(mopt, struct ip6_hbh *); 1127 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1128 } 1129 1130 /* fill in the option. */ 1131 optbuf[2] = IP6OPT_JUMBO; 1132 optbuf[3] = 4; 1133 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1134 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1135 1136 /* finally, adjust the packet header length */ 1137 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1138 1139 return (0); 1140#undef JUMBOOPTLEN 1141} 1142 1143/* 1144 * Insert fragment header and copy unfragmentable header portions. 1145 */ 1146static int 1147ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1148 struct ip6_frag **frghdrp) 1149{ 1150 struct mbuf *n, *mlast; 1151 1152 if (hlen > sizeof(struct ip6_hdr)) { 1153 n = m_copym(m0, sizeof(struct ip6_hdr), 1154 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1155 if (n == 0) 1156 return (ENOBUFS); 1157 m->m_next = n; 1158 } else 1159 n = m; 1160 1161 /* Search for the last mbuf of unfragmentable part. */ 1162 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1163 ; 1164 1165 if ((mlast->m_flags & M_EXT) == 0 && 1166 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1167 /* use the trailing space of the last mbuf for the fragment hdr */ 1168 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1169 mlast->m_len); 1170 mlast->m_len += sizeof(struct ip6_frag); 1171 m->m_pkthdr.len += sizeof(struct ip6_frag); 1172 } else { 1173 /* allocate a new mbuf for the fragment header */ 1174 struct mbuf *mfrg; 1175 1176 mfrg = m_get(M_NOWAIT, MT_DATA); 1177 if (mfrg == NULL) 1178 return (ENOBUFS); 1179 mfrg->m_len = sizeof(struct ip6_frag); 1180 *frghdrp = mtod(mfrg, struct ip6_frag *); 1181 mlast->m_next = mfrg; 1182 } 1183 1184 return (0); 1185} 1186 1187static int 1188ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, 1189 struct ifnet *ifp, struct in6_addr *dst, u_long *mtup, 1190 int *alwaysfragp, u_int fibnum) 1191{ 1192 u_int32_t mtu = 0; 1193 int alwaysfrag = 0; 1194 int error = 0; 1195 1196 if (ro_pmtu != ro) { 1197 /* The first hop and the final destination may differ. */ 1198 struct sockaddr_in6 *sa6_dst = 1199 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1200 if (ro_pmtu->ro_rt && 1201 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1202 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1203 RTFREE(ro_pmtu->ro_rt); 1204 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1205 } 1206 if (ro_pmtu->ro_rt == NULL) { 1207 bzero(sa6_dst, sizeof(*sa6_dst)); 1208 sa6_dst->sin6_family = AF_INET6; 1209 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1210 sa6_dst->sin6_addr = *dst; 1211 1212 in6_rtalloc(ro_pmtu, fibnum); 1213 } 1214 } 1215 if (ro_pmtu->ro_rt) { 1216 u_int32_t ifmtu; 1217 struct in_conninfo inc; 1218 1219 bzero(&inc, sizeof(inc)); 1220 inc.inc_flags |= INC_ISIPV6; 1221 inc.inc6_faddr = *dst; 1222 1223 if (ifp == NULL) 1224 ifp = ro_pmtu->ro_rt->rt_ifp; 1225 ifmtu = IN6_LINKMTU(ifp); 1226 mtu = tcp_hc_getmtu(&inc); 1227 if (mtu) 1228 mtu = min(mtu, ro_pmtu->ro_rt->rt_mtu); 1229 else 1230 mtu = ro_pmtu->ro_rt->rt_mtu; 1231 if (mtu == 0) 1232 mtu = ifmtu; 1233 else if (mtu < IPV6_MMTU) { 1234 /* 1235 * RFC2460 section 5, last paragraph: 1236 * if we record ICMPv6 too big message with 1237 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1238 * or smaller, with framgent header attached. 1239 * (fragment header is needed regardless from the 1240 * packet size, for translators to identify packets) 1241 */ 1242 alwaysfrag = 1; 1243 mtu = IPV6_MMTU; 1244 } else if (mtu > ifmtu) { 1245 /* 1246 * The MTU on the route is larger than the MTU on 1247 * the interface! This shouldn't happen, unless the 1248 * MTU of the interface has been changed after the 1249 * interface was brought up. Change the MTU in the 1250 * route to match the interface MTU (as long as the 1251 * field isn't locked). 1252 */ 1253 mtu = ifmtu; 1254 ro_pmtu->ro_rt->rt_mtu = mtu; 1255 } 1256 } else if (ifp) { 1257 mtu = IN6_LINKMTU(ifp); 1258 } else 1259 error = EHOSTUNREACH; /* XXX */ 1260 1261 *mtup = mtu; 1262 if (alwaysfragp) 1263 *alwaysfragp = alwaysfrag; 1264 return (error); 1265} 1266 1267/* 1268 * IP6 socket option processing. 1269 */ 1270int 1271ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1272{ 1273 int optdatalen, uproto; 1274 void *optdata; 1275 struct inpcb *in6p = sotoinpcb(so); 1276 int error, optval; 1277 int level, op, optname; 1278 int optlen; 1279 struct thread *td; 1280 1281 level = sopt->sopt_level; 1282 op = sopt->sopt_dir; 1283 optname = sopt->sopt_name; 1284 optlen = sopt->sopt_valsize; 1285 td = sopt->sopt_td; 1286 error = 0; 1287 optval = 0; 1288 uproto = (int)so->so_proto->pr_protocol; 1289 1290 if (level != IPPROTO_IPV6) { 1291 error = EINVAL; 1292 1293 if (sopt->sopt_level == SOL_SOCKET && 1294 sopt->sopt_dir == SOPT_SET) { 1295 switch (sopt->sopt_name) { 1296 case SO_REUSEADDR: 1297 INP_WLOCK(in6p); 1298 if ((so->so_options & SO_REUSEADDR) != 0) 1299 in6p->inp_flags2 |= INP_REUSEADDR; 1300 else 1301 in6p->inp_flags2 &= ~INP_REUSEADDR; 1302 INP_WUNLOCK(in6p); 1303 error = 0; 1304 break; 1305 case SO_REUSEPORT: 1306 INP_WLOCK(in6p); 1307 if ((so->so_options & SO_REUSEPORT) != 0) 1308 in6p->inp_flags2 |= INP_REUSEPORT; 1309 else 1310 in6p->inp_flags2 &= ~INP_REUSEPORT; 1311 INP_WUNLOCK(in6p); 1312 error = 0; 1313 break; 1314 case SO_SETFIB: 1315 INP_WLOCK(in6p); 1316 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1317 INP_WUNLOCK(in6p); 1318 error = 0; 1319 break; 1320 default: 1321 break; 1322 } 1323 } 1324 } else { /* level == IPPROTO_IPV6 */ 1325 switch (op) { 1326 1327 case SOPT_SET: 1328 switch (optname) { 1329 case IPV6_2292PKTOPTIONS: 1330#ifdef IPV6_PKTOPTIONS 1331 case IPV6_PKTOPTIONS: 1332#endif 1333 { 1334 struct mbuf *m; 1335 1336 error = soopt_getm(sopt, &m); /* XXX */ 1337 if (error != 0) 1338 break; 1339 error = soopt_mcopyin(sopt, m); /* XXX */ 1340 if (error != 0) 1341 break; 1342 error = ip6_pcbopts(&in6p->in6p_outputopts, 1343 m, so, sopt); 1344 m_freem(m); /* XXX */ 1345 break; 1346 } 1347 1348 /* 1349 * Use of some Hop-by-Hop options or some 1350 * Destination options, might require special 1351 * privilege. That is, normal applications 1352 * (without special privilege) might be forbidden 1353 * from setting certain options in outgoing packets, 1354 * and might never see certain options in received 1355 * packets. [RFC 2292 Section 6] 1356 * KAME specific note: 1357 * KAME prevents non-privileged users from sending or 1358 * receiving ANY hbh/dst options in order to avoid 1359 * overhead of parsing options in the kernel. 1360 */ 1361 case IPV6_RECVHOPOPTS: 1362 case IPV6_RECVDSTOPTS: 1363 case IPV6_RECVRTHDRDSTOPTS: 1364 if (td != NULL) { 1365 error = priv_check(td, 1366 PRIV_NETINET_SETHDROPTS); 1367 if (error) 1368 break; 1369 } 1370 /* FALLTHROUGH */ 1371 case IPV6_UNICAST_HOPS: 1372 case IPV6_HOPLIMIT: 1373 case IPV6_FAITH: 1374 1375 case IPV6_RECVPKTINFO: 1376 case IPV6_RECVHOPLIMIT: 1377 case IPV6_RECVRTHDR: 1378 case IPV6_RECVPATHMTU: 1379 case IPV6_RECVTCLASS: 1380 case IPV6_V6ONLY: 1381 case IPV6_AUTOFLOWLABEL: 1382 case IPV6_BINDANY: 1383 if (optname == IPV6_BINDANY && td != NULL) { 1384 error = priv_check(td, 1385 PRIV_NETINET_BINDANY); 1386 if (error) 1387 break; 1388 } 1389 1390 if (optlen != sizeof(int)) { 1391 error = EINVAL; 1392 break; 1393 } 1394 error = sooptcopyin(sopt, &optval, 1395 sizeof optval, sizeof optval); 1396 if (error) 1397 break; 1398 switch (optname) { 1399 1400 case IPV6_UNICAST_HOPS: 1401 if (optval < -1 || optval >= 256) 1402 error = EINVAL; 1403 else { 1404 /* -1 = kernel default */ 1405 in6p->in6p_hops = optval; 1406 if ((in6p->inp_vflag & 1407 INP_IPV4) != 0) 1408 in6p->inp_ip_ttl = optval; 1409 } 1410 break; 1411#define OPTSET(bit) \ 1412do { \ 1413 INP_WLOCK(in6p); \ 1414 if (optval) \ 1415 in6p->inp_flags |= (bit); \ 1416 else \ 1417 in6p->inp_flags &= ~(bit); \ 1418 INP_WUNLOCK(in6p); \ 1419} while (/*CONSTCOND*/ 0) 1420#define OPTSET2292(bit) \ 1421do { \ 1422 INP_WLOCK(in6p); \ 1423 in6p->inp_flags |= IN6P_RFC2292; \ 1424 if (optval) \ 1425 in6p->inp_flags |= (bit); \ 1426 else \ 1427 in6p->inp_flags &= ~(bit); \ 1428 INP_WUNLOCK(in6p); \ 1429} while (/*CONSTCOND*/ 0) 1430#define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1431 1432 case IPV6_RECVPKTINFO: 1433 /* cannot mix with RFC2292 */ 1434 if (OPTBIT(IN6P_RFC2292)) { 1435 error = EINVAL; 1436 break; 1437 } 1438 OPTSET(IN6P_PKTINFO); 1439 break; 1440 1441 case IPV6_HOPLIMIT: 1442 { 1443 struct ip6_pktopts **optp; 1444 1445 /* cannot mix with RFC2292 */ 1446 if (OPTBIT(IN6P_RFC2292)) { 1447 error = EINVAL; 1448 break; 1449 } 1450 optp = &in6p->in6p_outputopts; 1451 error = ip6_pcbopt(IPV6_HOPLIMIT, 1452 (u_char *)&optval, sizeof(optval), 1453 optp, (td != NULL) ? td->td_ucred : 1454 NULL, uproto); 1455 break; 1456 } 1457 1458 case IPV6_RECVHOPLIMIT: 1459 /* cannot mix with RFC2292 */ 1460 if (OPTBIT(IN6P_RFC2292)) { 1461 error = EINVAL; 1462 break; 1463 } 1464 OPTSET(IN6P_HOPLIMIT); 1465 break; 1466 1467 case IPV6_RECVHOPOPTS: 1468 /* cannot mix with RFC2292 */ 1469 if (OPTBIT(IN6P_RFC2292)) { 1470 error = EINVAL; 1471 break; 1472 } 1473 OPTSET(IN6P_HOPOPTS); 1474 break; 1475 1476 case IPV6_RECVDSTOPTS: 1477 /* cannot mix with RFC2292 */ 1478 if (OPTBIT(IN6P_RFC2292)) { 1479 error = EINVAL; 1480 break; 1481 } 1482 OPTSET(IN6P_DSTOPTS); 1483 break; 1484 1485 case IPV6_RECVRTHDRDSTOPTS: 1486 /* cannot mix with RFC2292 */ 1487 if (OPTBIT(IN6P_RFC2292)) { 1488 error = EINVAL; 1489 break; 1490 } 1491 OPTSET(IN6P_RTHDRDSTOPTS); 1492 break; 1493 1494 case IPV6_RECVRTHDR: 1495 /* cannot mix with RFC2292 */ 1496 if (OPTBIT(IN6P_RFC2292)) { 1497 error = EINVAL; 1498 break; 1499 } 1500 OPTSET(IN6P_RTHDR); 1501 break; 1502 1503 case IPV6_FAITH: 1504 OPTSET(INP_FAITH); 1505 break; 1506 1507 case IPV6_RECVPATHMTU: 1508 /* 1509 * We ignore this option for TCP 1510 * sockets. 1511 * (RFC3542 leaves this case 1512 * unspecified.) 1513 */ 1514 if (uproto != IPPROTO_TCP) 1515 OPTSET(IN6P_MTU); 1516 break; 1517 1518 case IPV6_V6ONLY: 1519 /* 1520 * make setsockopt(IPV6_V6ONLY) 1521 * available only prior to bind(2). 1522 * see ipng mailing list, Jun 22 2001. 1523 */ 1524 if (in6p->inp_lport || 1525 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1526 error = EINVAL; 1527 break; 1528 } 1529 OPTSET(IN6P_IPV6_V6ONLY); 1530 if (optval) 1531 in6p->inp_vflag &= ~INP_IPV4; 1532 else 1533 in6p->inp_vflag |= INP_IPV4; 1534 break; 1535 case IPV6_RECVTCLASS: 1536 /* cannot mix with RFC2292 XXX */ 1537 if (OPTBIT(IN6P_RFC2292)) { 1538 error = EINVAL; 1539 break; 1540 } 1541 OPTSET(IN6P_TCLASS); 1542 break; 1543 case IPV6_AUTOFLOWLABEL: 1544 OPTSET(IN6P_AUTOFLOWLABEL); 1545 break; 1546 1547 case IPV6_BINDANY: 1548 OPTSET(INP_BINDANY); 1549 break; 1550 } 1551 break; 1552 1553 case IPV6_TCLASS: 1554 case IPV6_DONTFRAG: 1555 case IPV6_USE_MIN_MTU: 1556 case IPV6_PREFER_TEMPADDR: 1557 if (optlen != sizeof(optval)) { 1558 error = EINVAL; 1559 break; 1560 } 1561 error = sooptcopyin(sopt, &optval, 1562 sizeof optval, sizeof optval); 1563 if (error) 1564 break; 1565 { 1566 struct ip6_pktopts **optp; 1567 optp = &in6p->in6p_outputopts; 1568 error = ip6_pcbopt(optname, 1569 (u_char *)&optval, sizeof(optval), 1570 optp, (td != NULL) ? td->td_ucred : 1571 NULL, uproto); 1572 break; 1573 } 1574 1575 case IPV6_2292PKTINFO: 1576 case IPV6_2292HOPLIMIT: 1577 case IPV6_2292HOPOPTS: 1578 case IPV6_2292DSTOPTS: 1579 case IPV6_2292RTHDR: 1580 /* RFC 2292 */ 1581 if (optlen != sizeof(int)) { 1582 error = EINVAL; 1583 break; 1584 } 1585 error = sooptcopyin(sopt, &optval, 1586 sizeof optval, sizeof optval); 1587 if (error) 1588 break; 1589 switch (optname) { 1590 case IPV6_2292PKTINFO: 1591 OPTSET2292(IN6P_PKTINFO); 1592 break; 1593 case IPV6_2292HOPLIMIT: 1594 OPTSET2292(IN6P_HOPLIMIT); 1595 break; 1596 case IPV6_2292HOPOPTS: 1597 /* 1598 * Check super-user privilege. 1599 * See comments for IPV6_RECVHOPOPTS. 1600 */ 1601 if (td != NULL) { 1602 error = priv_check(td, 1603 PRIV_NETINET_SETHDROPTS); 1604 if (error) 1605 return (error); 1606 } 1607 OPTSET2292(IN6P_HOPOPTS); 1608 break; 1609 case IPV6_2292DSTOPTS: 1610 if (td != NULL) { 1611 error = priv_check(td, 1612 PRIV_NETINET_SETHDROPTS); 1613 if (error) 1614 return (error); 1615 } 1616 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1617 break; 1618 case IPV6_2292RTHDR: 1619 OPTSET2292(IN6P_RTHDR); 1620 break; 1621 } 1622 break; 1623 case IPV6_PKTINFO: 1624 case IPV6_HOPOPTS: 1625 case IPV6_RTHDR: 1626 case IPV6_DSTOPTS: 1627 case IPV6_RTHDRDSTOPTS: 1628 case IPV6_NEXTHOP: 1629 { 1630 /* new advanced API (RFC3542) */ 1631 u_char *optbuf; 1632 u_char optbuf_storage[MCLBYTES]; 1633 int optlen; 1634 struct ip6_pktopts **optp; 1635 1636 /* cannot mix with RFC2292 */ 1637 if (OPTBIT(IN6P_RFC2292)) { 1638 error = EINVAL; 1639 break; 1640 } 1641 1642 /* 1643 * We only ensure valsize is not too large 1644 * here. Further validation will be done 1645 * later. 1646 */ 1647 error = sooptcopyin(sopt, optbuf_storage, 1648 sizeof(optbuf_storage), 0); 1649 if (error) 1650 break; 1651 optlen = sopt->sopt_valsize; 1652 optbuf = optbuf_storage; 1653 optp = &in6p->in6p_outputopts; 1654 error = ip6_pcbopt(optname, optbuf, optlen, 1655 optp, (td != NULL) ? td->td_ucred : NULL, 1656 uproto); 1657 break; 1658 } 1659#undef OPTSET 1660 1661 case IPV6_MULTICAST_IF: 1662 case IPV6_MULTICAST_HOPS: 1663 case IPV6_MULTICAST_LOOP: 1664 case IPV6_JOIN_GROUP: 1665 case IPV6_LEAVE_GROUP: 1666 case IPV6_MSFILTER: 1667 case MCAST_BLOCK_SOURCE: 1668 case MCAST_UNBLOCK_SOURCE: 1669 case MCAST_JOIN_GROUP: 1670 case MCAST_LEAVE_GROUP: 1671 case MCAST_JOIN_SOURCE_GROUP: 1672 case MCAST_LEAVE_SOURCE_GROUP: 1673 error = ip6_setmoptions(in6p, sopt); 1674 break; 1675 1676 case IPV6_PORTRANGE: 1677 error = sooptcopyin(sopt, &optval, 1678 sizeof optval, sizeof optval); 1679 if (error) 1680 break; 1681 1682 INP_WLOCK(in6p); 1683 switch (optval) { 1684 case IPV6_PORTRANGE_DEFAULT: 1685 in6p->inp_flags &= ~(INP_LOWPORT); 1686 in6p->inp_flags &= ~(INP_HIGHPORT); 1687 break; 1688 1689 case IPV6_PORTRANGE_HIGH: 1690 in6p->inp_flags &= ~(INP_LOWPORT); 1691 in6p->inp_flags |= INP_HIGHPORT; 1692 break; 1693 1694 case IPV6_PORTRANGE_LOW: 1695 in6p->inp_flags &= ~(INP_HIGHPORT); 1696 in6p->inp_flags |= INP_LOWPORT; 1697 break; 1698 1699 default: 1700 error = EINVAL; 1701 break; 1702 } 1703 INP_WUNLOCK(in6p); 1704 break; 1705 1706#ifdef IPSEC 1707 case IPV6_IPSEC_POLICY: 1708 { 1709 caddr_t req; 1710 struct mbuf *m; 1711 1712 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1713 break; 1714 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1715 break; 1716 req = mtod(m, caddr_t); 1717 error = ipsec_set_policy(in6p, optname, req, 1718 m->m_len, (sopt->sopt_td != NULL) ? 1719 sopt->sopt_td->td_ucred : NULL); 1720 m_freem(m); 1721 break; 1722 } 1723#endif /* IPSEC */ 1724 1725 default: 1726 error = ENOPROTOOPT; 1727 break; 1728 } 1729 break; 1730 1731 case SOPT_GET: 1732 switch (optname) { 1733 1734 case IPV6_2292PKTOPTIONS: 1735#ifdef IPV6_PKTOPTIONS 1736 case IPV6_PKTOPTIONS: 1737#endif 1738 /* 1739 * RFC3542 (effectively) deprecated the 1740 * semantics of the 2292-style pktoptions. 1741 * Since it was not reliable in nature (i.e., 1742 * applications had to expect the lack of some 1743 * information after all), it would make sense 1744 * to simplify this part by always returning 1745 * empty data. 1746 */ 1747 sopt->sopt_valsize = 0; 1748 break; 1749 1750 case IPV6_RECVHOPOPTS: 1751 case IPV6_RECVDSTOPTS: 1752 case IPV6_RECVRTHDRDSTOPTS: 1753 case IPV6_UNICAST_HOPS: 1754 case IPV6_RECVPKTINFO: 1755 case IPV6_RECVHOPLIMIT: 1756 case IPV6_RECVRTHDR: 1757 case IPV6_RECVPATHMTU: 1758 1759 case IPV6_FAITH: 1760 case IPV6_V6ONLY: 1761 case IPV6_PORTRANGE: 1762 case IPV6_RECVTCLASS: 1763 case IPV6_AUTOFLOWLABEL: 1764 case IPV6_BINDANY: 1765 switch (optname) { 1766 1767 case IPV6_RECVHOPOPTS: 1768 optval = OPTBIT(IN6P_HOPOPTS); 1769 break; 1770 1771 case IPV6_RECVDSTOPTS: 1772 optval = OPTBIT(IN6P_DSTOPTS); 1773 break; 1774 1775 case IPV6_RECVRTHDRDSTOPTS: 1776 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1777 break; 1778 1779 case IPV6_UNICAST_HOPS: 1780 optval = in6p->in6p_hops; 1781 break; 1782 1783 case IPV6_RECVPKTINFO: 1784 optval = OPTBIT(IN6P_PKTINFO); 1785 break; 1786 1787 case IPV6_RECVHOPLIMIT: 1788 optval = OPTBIT(IN6P_HOPLIMIT); 1789 break; 1790 1791 case IPV6_RECVRTHDR: 1792 optval = OPTBIT(IN6P_RTHDR); 1793 break; 1794 1795 case IPV6_RECVPATHMTU: 1796 optval = OPTBIT(IN6P_MTU); 1797 break; 1798 1799 case IPV6_FAITH: 1800 optval = OPTBIT(INP_FAITH); 1801 break; 1802 1803 case IPV6_V6ONLY: 1804 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1805 break; 1806 1807 case IPV6_PORTRANGE: 1808 { 1809 int flags; 1810 flags = in6p->inp_flags; 1811 if (flags & INP_HIGHPORT) 1812 optval = IPV6_PORTRANGE_HIGH; 1813 else if (flags & INP_LOWPORT) 1814 optval = IPV6_PORTRANGE_LOW; 1815 else 1816 optval = 0; 1817 break; 1818 } 1819 case IPV6_RECVTCLASS: 1820 optval = OPTBIT(IN6P_TCLASS); 1821 break; 1822 1823 case IPV6_AUTOFLOWLABEL: 1824 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1825 break; 1826 1827 case IPV6_BINDANY: 1828 optval = OPTBIT(INP_BINDANY); 1829 break; 1830 } 1831 if (error) 1832 break; 1833 error = sooptcopyout(sopt, &optval, 1834 sizeof optval); 1835 break; 1836 1837 case IPV6_PATHMTU: 1838 { 1839 u_long pmtu = 0; 1840 struct ip6_mtuinfo mtuinfo; 1841 struct route_in6 sro; 1842 1843 bzero(&sro, sizeof(sro)); 1844 1845 if (!(so->so_state & SS_ISCONNECTED)) 1846 return (ENOTCONN); 1847 /* 1848 * XXX: we dot not consider the case of source 1849 * routing, or optional information to specify 1850 * the outgoing interface. 1851 */ 1852 error = ip6_getpmtu(&sro, NULL, NULL, 1853 &in6p->in6p_faddr, &pmtu, NULL, 1854 so->so_fibnum); 1855 if (sro.ro_rt) 1856 RTFREE(sro.ro_rt); 1857 if (error) 1858 break; 1859 if (pmtu > IPV6_MAXPACKET) 1860 pmtu = IPV6_MAXPACKET; 1861 1862 bzero(&mtuinfo, sizeof(mtuinfo)); 1863 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1864 optdata = (void *)&mtuinfo; 1865 optdatalen = sizeof(mtuinfo); 1866 error = sooptcopyout(sopt, optdata, 1867 optdatalen); 1868 break; 1869 } 1870 1871 case IPV6_2292PKTINFO: 1872 case IPV6_2292HOPLIMIT: 1873 case IPV6_2292HOPOPTS: 1874 case IPV6_2292RTHDR: 1875 case IPV6_2292DSTOPTS: 1876 switch (optname) { 1877 case IPV6_2292PKTINFO: 1878 optval = OPTBIT(IN6P_PKTINFO); 1879 break; 1880 case IPV6_2292HOPLIMIT: 1881 optval = OPTBIT(IN6P_HOPLIMIT); 1882 break; 1883 case IPV6_2292HOPOPTS: 1884 optval = OPTBIT(IN6P_HOPOPTS); 1885 break; 1886 case IPV6_2292RTHDR: 1887 optval = OPTBIT(IN6P_RTHDR); 1888 break; 1889 case IPV6_2292DSTOPTS: 1890 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1891 break; 1892 } 1893 error = sooptcopyout(sopt, &optval, 1894 sizeof optval); 1895 break; 1896 case IPV6_PKTINFO: 1897 case IPV6_HOPOPTS: 1898 case IPV6_RTHDR: 1899 case IPV6_DSTOPTS: 1900 case IPV6_RTHDRDSTOPTS: 1901 case IPV6_NEXTHOP: 1902 case IPV6_TCLASS: 1903 case IPV6_DONTFRAG: 1904 case IPV6_USE_MIN_MTU: 1905 case IPV6_PREFER_TEMPADDR: 1906 error = ip6_getpcbopt(in6p->in6p_outputopts, 1907 optname, sopt); 1908 break; 1909 1910 case IPV6_MULTICAST_IF: 1911 case IPV6_MULTICAST_HOPS: 1912 case IPV6_MULTICAST_LOOP: 1913 case IPV6_MSFILTER: 1914 error = ip6_getmoptions(in6p, sopt); 1915 break; 1916 1917#ifdef IPSEC 1918 case IPV6_IPSEC_POLICY: 1919 { 1920 caddr_t req = NULL; 1921 size_t len = 0; 1922 struct mbuf *m = NULL; 1923 struct mbuf **mp = &m; 1924 size_t ovalsize = sopt->sopt_valsize; 1925 caddr_t oval = (caddr_t)sopt->sopt_val; 1926 1927 error = soopt_getm(sopt, &m); /* XXX */ 1928 if (error != 0) 1929 break; 1930 error = soopt_mcopyin(sopt, m); /* XXX */ 1931 if (error != 0) 1932 break; 1933 sopt->sopt_valsize = ovalsize; 1934 sopt->sopt_val = oval; 1935 if (m) { 1936 req = mtod(m, caddr_t); 1937 len = m->m_len; 1938 } 1939 error = ipsec_get_policy(in6p, req, len, mp); 1940 if (error == 0) 1941 error = soopt_mcopyout(sopt, m); /* XXX */ 1942 if (error == 0 && m) 1943 m_freem(m); 1944 break; 1945 } 1946#endif /* IPSEC */ 1947 1948 default: 1949 error = ENOPROTOOPT; 1950 break; 1951 } 1952 break; 1953 } 1954 } 1955 return (error); 1956} 1957 1958int 1959ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 1960{ 1961 int error = 0, optval, optlen; 1962 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1963 struct inpcb *in6p = sotoinpcb(so); 1964 int level, op, optname; 1965 1966 level = sopt->sopt_level; 1967 op = sopt->sopt_dir; 1968 optname = sopt->sopt_name; 1969 optlen = sopt->sopt_valsize; 1970 1971 if (level != IPPROTO_IPV6) { 1972 return (EINVAL); 1973 } 1974 1975 switch (optname) { 1976 case IPV6_CHECKSUM: 1977 /* 1978 * For ICMPv6 sockets, no modification allowed for checksum 1979 * offset, permit "no change" values to help existing apps. 1980 * 1981 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 1982 * for an ICMPv6 socket will fail." 1983 * The current behavior does not meet RFC3542. 1984 */ 1985 switch (op) { 1986 case SOPT_SET: 1987 if (optlen != sizeof(int)) { 1988 error = EINVAL; 1989 break; 1990 } 1991 error = sooptcopyin(sopt, &optval, sizeof(optval), 1992 sizeof(optval)); 1993 if (error) 1994 break; 1995 if ((optval % 2) != 0) { 1996 /* the API assumes even offset values */ 1997 error = EINVAL; 1998 } else if (so->so_proto->pr_protocol == 1999 IPPROTO_ICMPV6) { 2000 if (optval != icmp6off) 2001 error = EINVAL; 2002 } else 2003 in6p->in6p_cksum = optval; 2004 break; 2005 2006 case SOPT_GET: 2007 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2008 optval = icmp6off; 2009 else 2010 optval = in6p->in6p_cksum; 2011 2012 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2013 break; 2014 2015 default: 2016 error = EINVAL; 2017 break; 2018 } 2019 break; 2020 2021 default: 2022 error = ENOPROTOOPT; 2023 break; 2024 } 2025 2026 return (error); 2027} 2028 2029/* 2030 * Set up IP6 options in pcb for insertion in output packets or 2031 * specifying behavior of outgoing packets. 2032 */ 2033static int 2034ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2035 struct socket *so, struct sockopt *sopt) 2036{ 2037 struct ip6_pktopts *opt = *pktopt; 2038 int error = 0; 2039 struct thread *td = sopt->sopt_td; 2040 2041 /* turn off any old options. */ 2042 if (opt) { 2043#ifdef DIAGNOSTIC 2044 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2045 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2046 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2047 printf("ip6_pcbopts: all specified options are cleared.\n"); 2048#endif 2049 ip6_clearpktopts(opt, -1); 2050 } else 2051 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2052 *pktopt = NULL; 2053 2054 if (!m || m->m_len == 0) { 2055 /* 2056 * Only turning off any previous options, regardless of 2057 * whether the opt is just created or given. 2058 */ 2059 free(opt, M_IP6OPT); 2060 return (0); 2061 } 2062 2063 /* set options specified by user. */ 2064 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2065 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2066 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2067 free(opt, M_IP6OPT); 2068 return (error); 2069 } 2070 *pktopt = opt; 2071 return (0); 2072} 2073 2074/* 2075 * initialize ip6_pktopts. beware that there are non-zero default values in 2076 * the struct. 2077 */ 2078void 2079ip6_initpktopts(struct ip6_pktopts *opt) 2080{ 2081 2082 bzero(opt, sizeof(*opt)); 2083 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2084 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2085 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2086 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2087} 2088 2089static int 2090ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2091 struct ucred *cred, int uproto) 2092{ 2093 struct ip6_pktopts *opt; 2094 2095 if (*pktopt == NULL) { 2096 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2097 M_WAITOK); 2098 ip6_initpktopts(*pktopt); 2099 } 2100 opt = *pktopt; 2101 2102 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2103} 2104 2105static int 2106ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2107{ 2108 void *optdata = NULL; 2109 int optdatalen = 0; 2110 struct ip6_ext *ip6e; 2111 int error = 0; 2112 struct in6_pktinfo null_pktinfo; 2113 int deftclass = 0, on; 2114 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2115 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2116 2117 switch (optname) { 2118 case IPV6_PKTINFO: 2119 if (pktopt && pktopt->ip6po_pktinfo) 2120 optdata = (void *)pktopt->ip6po_pktinfo; 2121 else { 2122 /* XXX: we don't have to do this every time... */ 2123 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2124 optdata = (void *)&null_pktinfo; 2125 } 2126 optdatalen = sizeof(struct in6_pktinfo); 2127 break; 2128 case IPV6_TCLASS: 2129 if (pktopt && pktopt->ip6po_tclass >= 0) 2130 optdata = (void *)&pktopt->ip6po_tclass; 2131 else 2132 optdata = (void *)&deftclass; 2133 optdatalen = sizeof(int); 2134 break; 2135 case IPV6_HOPOPTS: 2136 if (pktopt && pktopt->ip6po_hbh) { 2137 optdata = (void *)pktopt->ip6po_hbh; 2138 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2139 optdatalen = (ip6e->ip6e_len + 1) << 3; 2140 } 2141 break; 2142 case IPV6_RTHDR: 2143 if (pktopt && pktopt->ip6po_rthdr) { 2144 optdata = (void *)pktopt->ip6po_rthdr; 2145 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2146 optdatalen = (ip6e->ip6e_len + 1) << 3; 2147 } 2148 break; 2149 case IPV6_RTHDRDSTOPTS: 2150 if (pktopt && pktopt->ip6po_dest1) { 2151 optdata = (void *)pktopt->ip6po_dest1; 2152 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2153 optdatalen = (ip6e->ip6e_len + 1) << 3; 2154 } 2155 break; 2156 case IPV6_DSTOPTS: 2157 if (pktopt && pktopt->ip6po_dest2) { 2158 optdata = (void *)pktopt->ip6po_dest2; 2159 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2160 optdatalen = (ip6e->ip6e_len + 1) << 3; 2161 } 2162 break; 2163 case IPV6_NEXTHOP: 2164 if (pktopt && pktopt->ip6po_nexthop) { 2165 optdata = (void *)pktopt->ip6po_nexthop; 2166 optdatalen = pktopt->ip6po_nexthop->sa_len; 2167 } 2168 break; 2169 case IPV6_USE_MIN_MTU: 2170 if (pktopt) 2171 optdata = (void *)&pktopt->ip6po_minmtu; 2172 else 2173 optdata = (void *)&defminmtu; 2174 optdatalen = sizeof(int); 2175 break; 2176 case IPV6_DONTFRAG: 2177 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2178 on = 1; 2179 else 2180 on = 0; 2181 optdata = (void *)&on; 2182 optdatalen = sizeof(on); 2183 break; 2184 case IPV6_PREFER_TEMPADDR: 2185 if (pktopt) 2186 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2187 else 2188 optdata = (void *)&defpreftemp; 2189 optdatalen = sizeof(int); 2190 break; 2191 default: /* should not happen */ 2192#ifdef DIAGNOSTIC 2193 panic("ip6_getpcbopt: unexpected option\n"); 2194#endif 2195 return (ENOPROTOOPT); 2196 } 2197 2198 error = sooptcopyout(sopt, optdata, optdatalen); 2199 2200 return (error); 2201} 2202 2203void 2204ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2205{ 2206 if (pktopt == NULL) 2207 return; 2208 2209 if (optname == -1 || optname == IPV6_PKTINFO) { 2210 if (pktopt->ip6po_pktinfo) 2211 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2212 pktopt->ip6po_pktinfo = NULL; 2213 } 2214 if (optname == -1 || optname == IPV6_HOPLIMIT) 2215 pktopt->ip6po_hlim = -1; 2216 if (optname == -1 || optname == IPV6_TCLASS) 2217 pktopt->ip6po_tclass = -1; 2218 if (optname == -1 || optname == IPV6_NEXTHOP) { 2219 if (pktopt->ip6po_nextroute.ro_rt) { 2220 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2221 pktopt->ip6po_nextroute.ro_rt = NULL; 2222 } 2223 if (pktopt->ip6po_nexthop) 2224 free(pktopt->ip6po_nexthop, M_IP6OPT); 2225 pktopt->ip6po_nexthop = NULL; 2226 } 2227 if (optname == -1 || optname == IPV6_HOPOPTS) { 2228 if (pktopt->ip6po_hbh) 2229 free(pktopt->ip6po_hbh, M_IP6OPT); 2230 pktopt->ip6po_hbh = NULL; 2231 } 2232 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2233 if (pktopt->ip6po_dest1) 2234 free(pktopt->ip6po_dest1, M_IP6OPT); 2235 pktopt->ip6po_dest1 = NULL; 2236 } 2237 if (optname == -1 || optname == IPV6_RTHDR) { 2238 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2239 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2240 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2241 if (pktopt->ip6po_route.ro_rt) { 2242 RTFREE(pktopt->ip6po_route.ro_rt); 2243 pktopt->ip6po_route.ro_rt = NULL; 2244 } 2245 } 2246 if (optname == -1 || optname == IPV6_DSTOPTS) { 2247 if (pktopt->ip6po_dest2) 2248 free(pktopt->ip6po_dest2, M_IP6OPT); 2249 pktopt->ip6po_dest2 = NULL; 2250 } 2251} 2252 2253#define PKTOPT_EXTHDRCPY(type) \ 2254do {\ 2255 if (src->type) {\ 2256 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2257 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2258 if (dst->type == NULL && canwait == M_NOWAIT)\ 2259 goto bad;\ 2260 bcopy(src->type, dst->type, hlen);\ 2261 }\ 2262} while (/*CONSTCOND*/ 0) 2263 2264static int 2265copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2266{ 2267 if (dst == NULL || src == NULL) { 2268 printf("ip6_clearpktopts: invalid argument\n"); 2269 return (EINVAL); 2270 } 2271 2272 dst->ip6po_hlim = src->ip6po_hlim; 2273 dst->ip6po_tclass = src->ip6po_tclass; 2274 dst->ip6po_flags = src->ip6po_flags; 2275 dst->ip6po_minmtu = src->ip6po_minmtu; 2276 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2277 if (src->ip6po_pktinfo) { 2278 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2279 M_IP6OPT, canwait); 2280 if (dst->ip6po_pktinfo == NULL) 2281 goto bad; 2282 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2283 } 2284 if (src->ip6po_nexthop) { 2285 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2286 M_IP6OPT, canwait); 2287 if (dst->ip6po_nexthop == NULL) 2288 goto bad; 2289 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2290 src->ip6po_nexthop->sa_len); 2291 } 2292 PKTOPT_EXTHDRCPY(ip6po_hbh); 2293 PKTOPT_EXTHDRCPY(ip6po_dest1); 2294 PKTOPT_EXTHDRCPY(ip6po_dest2); 2295 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2296 return (0); 2297 2298 bad: 2299 ip6_clearpktopts(dst, -1); 2300 return (ENOBUFS); 2301} 2302#undef PKTOPT_EXTHDRCPY 2303 2304struct ip6_pktopts * 2305ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2306{ 2307 int error; 2308 struct ip6_pktopts *dst; 2309 2310 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2311 if (dst == NULL) 2312 return (NULL); 2313 ip6_initpktopts(dst); 2314 2315 if ((error = copypktopts(dst, src, canwait)) != 0) { 2316 free(dst, M_IP6OPT); 2317 return (NULL); 2318 } 2319 2320 return (dst); 2321} 2322 2323void 2324ip6_freepcbopts(struct ip6_pktopts *pktopt) 2325{ 2326 if (pktopt == NULL) 2327 return; 2328 2329 ip6_clearpktopts(pktopt, -1); 2330 2331 free(pktopt, M_IP6OPT); 2332} 2333 2334/* 2335 * Set IPv6 outgoing packet options based on advanced API. 2336 */ 2337int 2338ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2339 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2340{ 2341 struct cmsghdr *cm = 0; 2342 2343 if (control == NULL || opt == NULL) 2344 return (EINVAL); 2345 2346 ip6_initpktopts(opt); 2347 if (stickyopt) { 2348 int error; 2349 2350 /* 2351 * If stickyopt is provided, make a local copy of the options 2352 * for this particular packet, then override them by ancillary 2353 * objects. 2354 * XXX: copypktopts() does not copy the cached route to a next 2355 * hop (if any). This is not very good in terms of efficiency, 2356 * but we can allow this since this option should be rarely 2357 * used. 2358 */ 2359 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2360 return (error); 2361 } 2362 2363 /* 2364 * XXX: Currently, we assume all the optional information is stored 2365 * in a single mbuf. 2366 */ 2367 if (control->m_next) 2368 return (EINVAL); 2369 2370 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2371 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2372 int error; 2373 2374 if (control->m_len < CMSG_LEN(0)) 2375 return (EINVAL); 2376 2377 cm = mtod(control, struct cmsghdr *); 2378 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2379 return (EINVAL); 2380 if (cm->cmsg_level != IPPROTO_IPV6) 2381 continue; 2382 2383 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2384 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2385 if (error) 2386 return (error); 2387 } 2388 2389 return (0); 2390} 2391 2392/* 2393 * Set a particular packet option, as a sticky option or an ancillary data 2394 * item. "len" can be 0 only when it's a sticky option. 2395 * We have 4 cases of combination of "sticky" and "cmsg": 2396 * "sticky=0, cmsg=0": impossible 2397 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2398 * "sticky=1, cmsg=0": RFC3542 socket option 2399 * "sticky=1, cmsg=1": RFC2292 socket option 2400 */ 2401static int 2402ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2403 struct ucred *cred, int sticky, int cmsg, int uproto) 2404{ 2405 int minmtupolicy, preftemp; 2406 int error; 2407 2408 if (!sticky && !cmsg) { 2409#ifdef DIAGNOSTIC 2410 printf("ip6_setpktopt: impossible case\n"); 2411#endif 2412 return (EINVAL); 2413 } 2414 2415 /* 2416 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2417 * not be specified in the context of RFC3542. Conversely, 2418 * RFC3542 types should not be specified in the context of RFC2292. 2419 */ 2420 if (!cmsg) { 2421 switch (optname) { 2422 case IPV6_2292PKTINFO: 2423 case IPV6_2292HOPLIMIT: 2424 case IPV6_2292NEXTHOP: 2425 case IPV6_2292HOPOPTS: 2426 case IPV6_2292DSTOPTS: 2427 case IPV6_2292RTHDR: 2428 case IPV6_2292PKTOPTIONS: 2429 return (ENOPROTOOPT); 2430 } 2431 } 2432 if (sticky && cmsg) { 2433 switch (optname) { 2434 case IPV6_PKTINFO: 2435 case IPV6_HOPLIMIT: 2436 case IPV6_NEXTHOP: 2437 case IPV6_HOPOPTS: 2438 case IPV6_DSTOPTS: 2439 case IPV6_RTHDRDSTOPTS: 2440 case IPV6_RTHDR: 2441 case IPV6_USE_MIN_MTU: 2442 case IPV6_DONTFRAG: 2443 case IPV6_TCLASS: 2444 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2445 return (ENOPROTOOPT); 2446 } 2447 } 2448 2449 switch (optname) { 2450 case IPV6_2292PKTINFO: 2451 case IPV6_PKTINFO: 2452 { 2453 struct ifnet *ifp = NULL; 2454 struct in6_pktinfo *pktinfo; 2455 2456 if (len != sizeof(struct in6_pktinfo)) 2457 return (EINVAL); 2458 2459 pktinfo = (struct in6_pktinfo *)buf; 2460 2461 /* 2462 * An application can clear any sticky IPV6_PKTINFO option by 2463 * doing a "regular" setsockopt with ipi6_addr being 2464 * in6addr_any and ipi6_ifindex being zero. 2465 * [RFC 3542, Section 6] 2466 */ 2467 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2468 pktinfo->ipi6_ifindex == 0 && 2469 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2470 ip6_clearpktopts(opt, optname); 2471 break; 2472 } 2473 2474 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2475 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2476 return (EINVAL); 2477 } 2478 2479 /* validate the interface index if specified. */ 2480 if (pktinfo->ipi6_ifindex > V_if_index || 2481 pktinfo->ipi6_ifindex < 0) { 2482 return (ENXIO); 2483 } 2484 if (pktinfo->ipi6_ifindex) { 2485 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2486 if (ifp == NULL) 2487 return (ENXIO); 2488 } 2489 2490 /* 2491 * We store the address anyway, and let in6_selectsrc() 2492 * validate the specified address. This is because ipi6_addr 2493 * may not have enough information about its scope zone, and 2494 * we may need additional information (such as outgoing 2495 * interface or the scope zone of a destination address) to 2496 * disambiguate the scope. 2497 * XXX: the delay of the validation may confuse the 2498 * application when it is used as a sticky option. 2499 */ 2500 if (opt->ip6po_pktinfo == NULL) { 2501 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2502 M_IP6OPT, M_NOWAIT); 2503 if (opt->ip6po_pktinfo == NULL) 2504 return (ENOBUFS); 2505 } 2506 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2507 break; 2508 } 2509 2510 case IPV6_2292HOPLIMIT: 2511 case IPV6_HOPLIMIT: 2512 { 2513 int *hlimp; 2514 2515 /* 2516 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2517 * to simplify the ordering among hoplimit options. 2518 */ 2519 if (optname == IPV6_HOPLIMIT && sticky) 2520 return (ENOPROTOOPT); 2521 2522 if (len != sizeof(int)) 2523 return (EINVAL); 2524 hlimp = (int *)buf; 2525 if (*hlimp < -1 || *hlimp > 255) 2526 return (EINVAL); 2527 2528 opt->ip6po_hlim = *hlimp; 2529 break; 2530 } 2531 2532 case IPV6_TCLASS: 2533 { 2534 int tclass; 2535 2536 if (len != sizeof(int)) 2537 return (EINVAL); 2538 tclass = *(int *)buf; 2539 if (tclass < -1 || tclass > 255) 2540 return (EINVAL); 2541 2542 opt->ip6po_tclass = tclass; 2543 break; 2544 } 2545 2546 case IPV6_2292NEXTHOP: 2547 case IPV6_NEXTHOP: 2548 if (cred != NULL) { 2549 error = priv_check_cred(cred, 2550 PRIV_NETINET_SETHDROPTS, 0); 2551 if (error) 2552 return (error); 2553 } 2554 2555 if (len == 0) { /* just remove the option */ 2556 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2557 break; 2558 } 2559 2560 /* check if cmsg_len is large enough for sa_len */ 2561 if (len < sizeof(struct sockaddr) || len < *buf) 2562 return (EINVAL); 2563 2564 switch (((struct sockaddr *)buf)->sa_family) { 2565 case AF_INET6: 2566 { 2567 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2568 int error; 2569 2570 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2571 return (EINVAL); 2572 2573 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2574 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2575 return (EINVAL); 2576 } 2577 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2578 != 0) { 2579 return (error); 2580 } 2581 break; 2582 } 2583 case AF_LINK: /* should eventually be supported */ 2584 default: 2585 return (EAFNOSUPPORT); 2586 } 2587 2588 /* turn off the previous option, then set the new option. */ 2589 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2590 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2591 if (opt->ip6po_nexthop == NULL) 2592 return (ENOBUFS); 2593 bcopy(buf, opt->ip6po_nexthop, *buf); 2594 break; 2595 2596 case IPV6_2292HOPOPTS: 2597 case IPV6_HOPOPTS: 2598 { 2599 struct ip6_hbh *hbh; 2600 int hbhlen; 2601 2602 /* 2603 * XXX: We don't allow a non-privileged user to set ANY HbH 2604 * options, since per-option restriction has too much 2605 * overhead. 2606 */ 2607 if (cred != NULL) { 2608 error = priv_check_cred(cred, 2609 PRIV_NETINET_SETHDROPTS, 0); 2610 if (error) 2611 return (error); 2612 } 2613 2614 if (len == 0) { 2615 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2616 break; /* just remove the option */ 2617 } 2618 2619 /* message length validation */ 2620 if (len < sizeof(struct ip6_hbh)) 2621 return (EINVAL); 2622 hbh = (struct ip6_hbh *)buf; 2623 hbhlen = (hbh->ip6h_len + 1) << 3; 2624 if (len != hbhlen) 2625 return (EINVAL); 2626 2627 /* turn off the previous option, then set the new option. */ 2628 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2629 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2630 if (opt->ip6po_hbh == NULL) 2631 return (ENOBUFS); 2632 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2633 2634 break; 2635 } 2636 2637 case IPV6_2292DSTOPTS: 2638 case IPV6_DSTOPTS: 2639 case IPV6_RTHDRDSTOPTS: 2640 { 2641 struct ip6_dest *dest, **newdest = NULL; 2642 int destlen; 2643 2644 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2645 error = priv_check_cred(cred, 2646 PRIV_NETINET_SETHDROPTS, 0); 2647 if (error) 2648 return (error); 2649 } 2650 2651 if (len == 0) { 2652 ip6_clearpktopts(opt, optname); 2653 break; /* just remove the option */ 2654 } 2655 2656 /* message length validation */ 2657 if (len < sizeof(struct ip6_dest)) 2658 return (EINVAL); 2659 dest = (struct ip6_dest *)buf; 2660 destlen = (dest->ip6d_len + 1) << 3; 2661 if (len != destlen) 2662 return (EINVAL); 2663 2664 /* 2665 * Determine the position that the destination options header 2666 * should be inserted; before or after the routing header. 2667 */ 2668 switch (optname) { 2669 case IPV6_2292DSTOPTS: 2670 /* 2671 * The old advacned API is ambiguous on this point. 2672 * Our approach is to determine the position based 2673 * according to the existence of a routing header. 2674 * Note, however, that this depends on the order of the 2675 * extension headers in the ancillary data; the 1st 2676 * part of the destination options header must appear 2677 * before the routing header in the ancillary data, 2678 * too. 2679 * RFC3542 solved the ambiguity by introducing 2680 * separate ancillary data or option types. 2681 */ 2682 if (opt->ip6po_rthdr == NULL) 2683 newdest = &opt->ip6po_dest1; 2684 else 2685 newdest = &opt->ip6po_dest2; 2686 break; 2687 case IPV6_RTHDRDSTOPTS: 2688 newdest = &opt->ip6po_dest1; 2689 break; 2690 case IPV6_DSTOPTS: 2691 newdest = &opt->ip6po_dest2; 2692 break; 2693 } 2694 2695 /* turn off the previous option, then set the new option. */ 2696 ip6_clearpktopts(opt, optname); 2697 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2698 if (*newdest == NULL) 2699 return (ENOBUFS); 2700 bcopy(dest, *newdest, destlen); 2701 2702 break; 2703 } 2704 2705 case IPV6_2292RTHDR: 2706 case IPV6_RTHDR: 2707 { 2708 struct ip6_rthdr *rth; 2709 int rthlen; 2710 2711 if (len == 0) { 2712 ip6_clearpktopts(opt, IPV6_RTHDR); 2713 break; /* just remove the option */ 2714 } 2715 2716 /* message length validation */ 2717 if (len < sizeof(struct ip6_rthdr)) 2718 return (EINVAL); 2719 rth = (struct ip6_rthdr *)buf; 2720 rthlen = (rth->ip6r_len + 1) << 3; 2721 if (len != rthlen) 2722 return (EINVAL); 2723 2724 switch (rth->ip6r_type) { 2725 case IPV6_RTHDR_TYPE_0: 2726 if (rth->ip6r_len == 0) /* must contain one addr */ 2727 return (EINVAL); 2728 if (rth->ip6r_len % 2) /* length must be even */ 2729 return (EINVAL); 2730 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2731 return (EINVAL); 2732 break; 2733 default: 2734 return (EINVAL); /* not supported */ 2735 } 2736 2737 /* turn off the previous option */ 2738 ip6_clearpktopts(opt, IPV6_RTHDR); 2739 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2740 if (opt->ip6po_rthdr == NULL) 2741 return (ENOBUFS); 2742 bcopy(rth, opt->ip6po_rthdr, rthlen); 2743 2744 break; 2745 } 2746 2747 case IPV6_USE_MIN_MTU: 2748 if (len != sizeof(int)) 2749 return (EINVAL); 2750 minmtupolicy = *(int *)buf; 2751 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2752 minmtupolicy != IP6PO_MINMTU_DISABLE && 2753 minmtupolicy != IP6PO_MINMTU_ALL) { 2754 return (EINVAL); 2755 } 2756 opt->ip6po_minmtu = minmtupolicy; 2757 break; 2758 2759 case IPV6_DONTFRAG: 2760 if (len != sizeof(int)) 2761 return (EINVAL); 2762 2763 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2764 /* 2765 * we ignore this option for TCP sockets. 2766 * (RFC3542 leaves this case unspecified.) 2767 */ 2768 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2769 } else 2770 opt->ip6po_flags |= IP6PO_DONTFRAG; 2771 break; 2772 2773 case IPV6_PREFER_TEMPADDR: 2774 if (len != sizeof(int)) 2775 return (EINVAL); 2776 preftemp = *(int *)buf; 2777 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2778 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2779 preftemp != IP6PO_TEMPADDR_PREFER) { 2780 return (EINVAL); 2781 } 2782 opt->ip6po_prefer_tempaddr = preftemp; 2783 break; 2784 2785 default: 2786 return (ENOPROTOOPT); 2787 } /* end of switch */ 2788 2789 return (0); 2790} 2791 2792/* 2793 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2794 * packet to the input queue of a specified interface. Note that this 2795 * calls the output routine of the loopback "driver", but with an interface 2796 * pointer that might NOT be &loif -- easier than replicating that code here. 2797 */ 2798void 2799ip6_mloopback(struct ifnet *ifp, struct mbuf *m, struct sockaddr_in6 *dst) 2800{ 2801 struct mbuf *copym; 2802 struct ip6_hdr *ip6; 2803 2804 copym = m_copy(m, 0, M_COPYALL); 2805 if (copym == NULL) 2806 return; 2807 2808 /* 2809 * Make sure to deep-copy IPv6 header portion in case the data 2810 * is in an mbuf cluster, so that we can safely override the IPv6 2811 * header portion later. 2812 */ 2813 if ((copym->m_flags & M_EXT) != 0 || 2814 copym->m_len < sizeof(struct ip6_hdr)) { 2815 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2816 if (copym == NULL) 2817 return; 2818 } 2819 ip6 = mtod(copym, struct ip6_hdr *); 2820 /* 2821 * clear embedded scope identifiers if necessary. 2822 * in6_clearscope will touch the addresses only when necessary. 2823 */ 2824 in6_clearscope(&ip6->ip6_src); 2825 in6_clearscope(&ip6->ip6_dst); 2826 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 2827 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 2828 CSUM_PSEUDO_HDR; 2829 copym->m_pkthdr.csum_data = 0xffff; 2830 } 2831 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 2832} 2833 2834/* 2835 * Chop IPv6 header off from the payload. 2836 */ 2837static int 2838ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 2839{ 2840 struct mbuf *mh; 2841 struct ip6_hdr *ip6; 2842 2843 ip6 = mtod(m, struct ip6_hdr *); 2844 if (m->m_len > sizeof(*ip6)) { 2845 mh = m_gethdr(M_NOWAIT, MT_DATA); 2846 if (mh == NULL) { 2847 m_freem(m); 2848 return ENOBUFS; 2849 } 2850 m_move_pkthdr(mh, m); 2851 MH_ALIGN(mh, sizeof(*ip6)); 2852 m->m_len -= sizeof(*ip6); 2853 m->m_data += sizeof(*ip6); 2854 mh->m_next = m; 2855 m = mh; 2856 m->m_len = sizeof(*ip6); 2857 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2858 } 2859 exthdrs->ip6e_ip6 = m; 2860 return 0; 2861} 2862 2863/* 2864 * Compute IPv6 extension header length. 2865 */ 2866int 2867ip6_optlen(struct inpcb *in6p) 2868{ 2869 int len; 2870 2871 if (!in6p->in6p_outputopts) 2872 return 0; 2873 2874 len = 0; 2875#define elen(x) \ 2876 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2877 2878 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2879 if (in6p->in6p_outputopts->ip6po_rthdr) 2880 /* dest1 is valid with rthdr only */ 2881 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2882 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2883 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2884 return len; 2885#undef elen 2886} 2887