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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/11.1/sys/netinet6/ip6_output.c 318846 2017-05-25 01:14:34Z np $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_sctp.h" 70 #include "opt_route.h" 71 #include "opt_rss.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/if_var.h> 90 #include <net/if_llatbl.h> 91 #include <net/netisr.h> 92 #include <net/route.h> 93 #include <net/pfil.h> 94 #include <net/rss_config.h> 95 #include <net/vnet.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 #include <netinet/ip_var.h> 100 #include <netinet6/in6_fib.h> 101 #include <netinet6/in6_var.h> 102 #include <netinet/ip6.h> 103 #include <netinet/icmp6.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/tcp_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/in6_rss.h> 109 110 #include <netipsec/ipsec_support.h> 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 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options"); 134 135 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 136 struct ucred *, int); 137 static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, 138 struct socket *, struct sockopt *); 139 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 140 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, 141 struct ucred *, int, int, int); 142 143 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 144 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 145 struct ip6_frag **); 146 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 147 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 148 static int ip6_getpmtu(struct route_in6 *, int, 149 struct ifnet *, const struct in6_addr *, u_long *, int *, u_int, 150 u_int); 151 static int ip6_calcmtu(struct ifnet *, const struct in6_addr *, u_long, 152 u_long *, int *, u_int); 153 static int ip6_getpmtu_ctl(u_int, const struct in6_addr *, u_long *); 154 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 155 156 157 /* 158 * Make an extension header from option data. hp is the source, and 159 * mp is the destination. 160 */ 161 #define MAKE_EXTHDR(hp, mp) \ 162 do { \ 163 if (hp) { \ 164 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 165 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 166 ((eh)->ip6e_len + 1) << 3); \ 167 if (error) \ 168 goto freehdrs; \ 169 } \ 170 } while (/*CONSTCOND*/ 0) 171 172 /* 173 * Form a chain of extension headers. 174 * m is the extension header mbuf 175 * mp is the previous mbuf in the chain 176 * p is the next header 177 * i is the type of option. 178 */ 179 #define MAKE_CHAIN(m, mp, p, i)\ 180 do {\ 181 if (m) {\ 182 if (!hdrsplit) \ 183 panic("assumption failed: hdr not split"); \ 184 *mtod((m), u_char *) = *(p);\ 185 *(p) = (i);\ 186 p = mtod((m), u_char *);\ 187 (m)->m_next = (mp)->m_next;\ 188 (mp)->m_next = (m);\ 189 (mp) = (m);\ 190 }\ 191 } while (/*CONSTCOND*/ 0) 192 193 void 194 in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset) 195 { 196 u_short csum; 197 198 csum = in_cksum_skip(m, offset + plen, offset); 199 if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6 && csum == 0) 200 csum = 0xffff; 201 offset += m->m_pkthdr.csum_data; /* checksum offset */ 202 203 if (offset + sizeof(u_short) > m->m_len) { 204 printf("%s: delayed m_pullup, m->len: %d plen %u off %u " 205 "csum_flags=%b\n", __func__, m->m_len, plen, offset, 206 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 207 /* 208 * XXX this should not happen, but if it does, the correct 209 * behavior may be to insert the checksum in the appropriate 210 * next mbuf in the chain. 211 */ 212 return; 213 } 214 *(u_short *)(m->m_data + offset) = csum; 215 } 216 217 int 218 ip6_fragment(struct ifnet *ifp, struct mbuf *m0, int hlen, u_char nextproto, 219 int mtu, uint32_t id) 220 { 221 struct mbuf *m, **mnext, *m_frgpart; 222 struct ip6_hdr *ip6, *mhip6; 223 struct ip6_frag *ip6f; 224 int off; 225 int error; 226 int tlen = m0->m_pkthdr.len; 227 228 KASSERT(( mtu % 8 == 0), ("Fragment length must be a multiple of 8")); 229 230 m = m0; 231 ip6 = mtod(m, struct ip6_hdr *); 232 mnext = &m->m_nextpkt; 233 234 for (off = hlen; off < tlen; off += mtu) { 235 m = m_gethdr(M_NOWAIT, MT_DATA); 236 if (!m) { 237 IP6STAT_INC(ip6s_odropped); 238 return (ENOBUFS); 239 } 240 m->m_flags = m0->m_flags & M_COPYFLAGS; 241 *mnext = m; 242 mnext = &m->m_nextpkt; 243 m->m_data += max_linkhdr; 244 mhip6 = mtod(m, struct ip6_hdr *); 245 *mhip6 = *ip6; 246 m->m_len = sizeof(*mhip6); 247 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 248 if (error) { 249 IP6STAT_INC(ip6s_odropped); 250 return (error); 251 } 252 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 253 if (off + mtu >= tlen) 254 mtu = tlen - off; 255 else 256 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 257 mhip6->ip6_plen = htons((u_short)(mtu + hlen + 258 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 259 if ((m_frgpart = m_copy(m0, off, mtu)) == NULL) { 260 IP6STAT_INC(ip6s_odropped); 261 return (ENOBUFS); 262 } 263 m_cat(m, m_frgpart); 264 m->m_pkthdr.len = mtu + hlen + sizeof(*ip6f); 265 m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum; 266 m->m_pkthdr.rcvif = NULL; 267 ip6f->ip6f_reserved = 0; 268 ip6f->ip6f_ident = id; 269 ip6f->ip6f_nxt = nextproto; 270 IP6STAT_INC(ip6s_ofragments); 271 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 272 } 273 274 return (0); 275 } 276 277 /* 278 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 279 * header (with pri, len, nxt, hlim, src, dst). 280 * This function may modify ver and hlim only. 281 * The mbuf chain containing the packet will be freed. 282 * The mbuf opt, if present, will not be freed. 283 * If route_in6 ro is present and has ro_rt initialized, route lookup would be 284 * skipped and ro->ro_rt would be used. If ro is present but ro->ro_rt is NULL, 285 * then result of route lookup is stored in ro->ro_rt. 286 * 287 * type of "mtu": rt_mtu is u_long, ifnet.ifr_mtu is int, and 288 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 289 * which is rt_mtu. 290 * 291 * ifpp - XXX: just for statistics 292 */ 293 /* 294 * XXX TODO: no flowid is assigned for outbound flows? 295 */ 296 int 297 ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, 298 struct route_in6 *ro, int flags, struct ip6_moptions *im6o, 299 struct ifnet **ifpp, struct inpcb *inp) 300 { 301 struct ip6_hdr *ip6; 302 struct ifnet *ifp, *origifp; 303 struct mbuf *m = m0; 304 struct mbuf *mprev = NULL; 305 int hlen, tlen, len; 306 struct route_in6 ip6route; 307 struct rtentry *rt = NULL; 308 struct sockaddr_in6 *dst, src_sa, dst_sa; 309 struct in6_addr odst; 310 int error = 0; 311 struct in6_ifaddr *ia = NULL; 312 u_long mtu; 313 int alwaysfrag, dontfrag; 314 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 315 struct ip6_exthdrs exthdrs; 316 struct in6_addr src0, dst0; 317 u_int32_t zone; 318 struct route_in6 *ro_pmtu = NULL; 319 int hdrsplit = 0; 320 int sw_csum, tso; 321 int needfiblookup; 322 uint32_t fibnum; 323 struct m_tag *fwd_tag = NULL; 324 uint32_t id; 325 326 if (inp != NULL) { 327 INP_LOCK_ASSERT(inp); 328 M_SETFIB(m, inp->inp_inc.inc_fibnum); 329 if ((flags & IP_NODEFAULTFLOWID) == 0) { 330 /* unconditionally set flowid */ 331 m->m_pkthdr.flowid = inp->inp_flowid; 332 M_HASHTYPE_SET(m, inp->inp_flowtype); 333 } 334 } 335 336 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 337 /* 338 * IPSec checking which handles several cases. 339 * FAST IPSEC: We re-injected the packet. 340 * XXX: need scope argument. 341 */ 342 if (IPSEC_ENABLED(ipv6)) { 343 if ((error = IPSEC_OUTPUT(ipv6, m, inp)) != 0) { 344 if (error == EINPROGRESS) 345 error = 0; 346 goto done; 347 } 348 } 349 #endif /* IPSEC */ 350 351 bzero(&exthdrs, sizeof(exthdrs)); 352 if (opt) { 353 /* Hop-by-Hop options header */ 354 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 355 /* Destination options header(1st part) */ 356 if (opt->ip6po_rthdr) { 357 /* 358 * Destination options header(1st part) 359 * This only makes sense with a routing header. 360 * See Section 9.2 of RFC 3542. 361 * Disabling this part just for MIP6 convenience is 362 * a bad idea. We need to think carefully about a 363 * way to make the advanced API coexist with MIP6 364 * options, which might automatically be inserted in 365 * the kernel. 366 */ 367 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 368 } 369 /* Routing header */ 370 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 371 /* Destination options header(2nd part) */ 372 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 373 } 374 375 /* 376 * Calculate the total length of the extension header chain. 377 * Keep the length of the unfragmentable part for fragmentation. 378 */ 379 optlen = 0; 380 if (exthdrs.ip6e_hbh) 381 optlen += exthdrs.ip6e_hbh->m_len; 382 if (exthdrs.ip6e_dest1) 383 optlen += exthdrs.ip6e_dest1->m_len; 384 if (exthdrs.ip6e_rthdr) 385 optlen += exthdrs.ip6e_rthdr->m_len; 386 unfragpartlen = optlen + sizeof(struct ip6_hdr); 387 388 /* NOTE: we don't add AH/ESP length here (done in ip6_ipsec_output) */ 389 if (exthdrs.ip6e_dest2) 390 optlen += exthdrs.ip6e_dest2->m_len; 391 392 /* 393 * If there is at least one extension header, 394 * separate IP6 header from the payload. 395 */ 396 if (optlen && !hdrsplit) { 397 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 398 m = NULL; 399 goto freehdrs; 400 } 401 m = exthdrs.ip6e_ip6; 402 hdrsplit++; 403 } 404 405 ip6 = mtod(m, struct ip6_hdr *); 406 407 /* adjust mbuf packet header length */ 408 m->m_pkthdr.len += optlen; 409 plen = m->m_pkthdr.len - sizeof(*ip6); 410 411 /* If this is a jumbo payload, insert a jumbo payload option. */ 412 if (plen > IPV6_MAXPACKET) { 413 if (!hdrsplit) { 414 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 415 m = NULL; 416 goto freehdrs; 417 } 418 m = exthdrs.ip6e_ip6; 419 hdrsplit++; 420 } 421 /* adjust pointer */ 422 ip6 = mtod(m, struct ip6_hdr *); 423 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 424 goto freehdrs; 425 ip6->ip6_plen = 0; 426 } else 427 ip6->ip6_plen = htons(plen); 428 429 /* 430 * Concatenate headers and fill in next header fields. 431 * Here we have, on "m" 432 * IPv6 payload 433 * and we insert headers accordingly. Finally, we should be getting: 434 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 435 * 436 * during the header composing process, "m" points to IPv6 header. 437 * "mprev" points to an extension header prior to esp. 438 */ 439 u_char *nexthdrp = &ip6->ip6_nxt; 440 mprev = m; 441 442 /* 443 * we treat dest2 specially. this makes IPsec processing 444 * much easier. the goal here is to make mprev point the 445 * mbuf prior to dest2. 446 * 447 * result: IPv6 dest2 payload 448 * m and mprev will point to IPv6 header. 449 */ 450 if (exthdrs.ip6e_dest2) { 451 if (!hdrsplit) 452 panic("assumption failed: hdr not split"); 453 exthdrs.ip6e_dest2->m_next = m->m_next; 454 m->m_next = exthdrs.ip6e_dest2; 455 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 456 ip6->ip6_nxt = IPPROTO_DSTOPTS; 457 } 458 459 /* 460 * result: IPv6 hbh dest1 rthdr dest2 payload 461 * m will point to IPv6 header. mprev will point to the 462 * extension header prior to dest2 (rthdr in the above case). 463 */ 464 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 465 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 466 IPPROTO_DSTOPTS); 467 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 468 IPPROTO_ROUTING); 469 470 /* 471 * If there is a routing header, discard the packet. 472 */ 473 if (exthdrs.ip6e_rthdr) { 474 error = EINVAL; 475 goto bad; 476 } 477 478 /* Source address validation */ 479 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 480 (flags & IPV6_UNSPECSRC) == 0) { 481 error = EOPNOTSUPP; 482 IP6STAT_INC(ip6s_badscope); 483 goto bad; 484 } 485 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 486 error = EOPNOTSUPP; 487 IP6STAT_INC(ip6s_badscope); 488 goto bad; 489 } 490 491 IP6STAT_INC(ip6s_localout); 492 493 /* 494 * Route packet. 495 */ 496 if (ro == NULL) { 497 ro = &ip6route; 498 bzero((caddr_t)ro, sizeof(*ro)); 499 } 500 ro_pmtu = ro; 501 if (opt && opt->ip6po_rthdr) 502 ro = &opt->ip6po_route; 503 dst = (struct sockaddr_in6 *)&ro->ro_dst; 504 #ifdef FLOWTABLE 505 if (ro->ro_rt == NULL) 506 (void )flowtable_lookup(AF_INET6, m, (struct route *)ro); 507 #endif 508 fibnum = (inp != NULL) ? inp->inp_inc.inc_fibnum : M_GETFIB(m); 509 again: 510 /* 511 * if specified, try to fill in the traffic class field. 512 * do not override if a non-zero value is already set. 513 * we check the diffserv field and the ecn field separately. 514 */ 515 if (opt && opt->ip6po_tclass >= 0) { 516 int mask = 0; 517 518 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 519 mask |= 0xfc; 520 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 521 mask |= 0x03; 522 if (mask != 0) 523 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 524 } 525 526 /* fill in or override the hop limit field, if necessary. */ 527 if (opt && opt->ip6po_hlim != -1) 528 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 529 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 530 if (im6o != NULL) 531 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 532 else 533 ip6->ip6_hlim = V_ip6_defmcasthlim; 534 } 535 /* 536 * Validate route against routing table additions; 537 * a better/more specific route might have been added. 538 * Make sure address family is set in route. 539 */ 540 if (inp) { 541 ro->ro_dst.sin6_family = AF_INET6; 542 RT_VALIDATE((struct route *)ro, &inp->inp_rt_cookie, fibnum); 543 } 544 if (ro->ro_rt && fwd_tag == NULL && (ro->ro_rt->rt_flags & RTF_UP) && 545 ro->ro_dst.sin6_family == AF_INET6 && 546 IN6_ARE_ADDR_EQUAL(&ro->ro_dst.sin6_addr, &ip6->ip6_dst)) { 547 rt = ro->ro_rt; 548 ifp = ro->ro_rt->rt_ifp; 549 } else { 550 if (ro->ro_lle) 551 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 552 ro->ro_lle = NULL; 553 if (fwd_tag == NULL) { 554 bzero(&dst_sa, sizeof(dst_sa)); 555 dst_sa.sin6_family = AF_INET6; 556 dst_sa.sin6_len = sizeof(dst_sa); 557 dst_sa.sin6_addr = ip6->ip6_dst; 558 } 559 error = in6_selectroute_fib(&dst_sa, opt, im6o, ro, &ifp, 560 &rt, fibnum); 561 if (error != 0) { 562 if (ifp != NULL) 563 in6_ifstat_inc(ifp, ifs6_out_discard); 564 goto bad; 565 } 566 } 567 if (rt == NULL) { 568 /* 569 * If in6_selectroute() does not return a route entry, 570 * dst may not have been updated. 571 */ 572 *dst = dst_sa; /* XXX */ 573 } 574 575 /* 576 * then rt (for unicast) and ifp must be non-NULL valid values. 577 */ 578 if ((flags & IPV6_FORWARDING) == 0) { 579 /* XXX: the FORWARDING flag can be set for mrouting. */ 580 in6_ifstat_inc(ifp, ifs6_out_request); 581 } 582 if (rt != NULL) { 583 ia = (struct in6_ifaddr *)(rt->rt_ifa); 584 counter_u64_add(rt->rt_pksent, 1); 585 } 586 587 588 /* 589 * The outgoing interface must be in the zone of source and 590 * destination addresses. 591 */ 592 origifp = ifp; 593 594 src0 = ip6->ip6_src; 595 if (in6_setscope(&src0, origifp, &zone)) 596 goto badscope; 597 bzero(&src_sa, sizeof(src_sa)); 598 src_sa.sin6_family = AF_INET6; 599 src_sa.sin6_len = sizeof(src_sa); 600 src_sa.sin6_addr = ip6->ip6_src; 601 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 602 goto badscope; 603 604 dst0 = ip6->ip6_dst; 605 if (in6_setscope(&dst0, origifp, &zone)) 606 goto badscope; 607 /* re-initialize to be sure */ 608 bzero(&dst_sa, sizeof(dst_sa)); 609 dst_sa.sin6_family = AF_INET6; 610 dst_sa.sin6_len = sizeof(dst_sa); 611 dst_sa.sin6_addr = ip6->ip6_dst; 612 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 613 goto badscope; 614 } 615 616 /* We should use ia_ifp to support the case of 617 * sending packets to an address of our own. 618 */ 619 if (ia != NULL && ia->ia_ifp) 620 ifp = ia->ia_ifp; 621 622 /* scope check is done. */ 623 goto routefound; 624 625 badscope: 626 IP6STAT_INC(ip6s_badscope); 627 in6_ifstat_inc(origifp, ifs6_out_discard); 628 if (error == 0) 629 error = EHOSTUNREACH; /* XXX */ 630 goto bad; 631 632 routefound: 633 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 634 if (opt && opt->ip6po_nextroute.ro_rt) { 635 /* 636 * The nexthop is explicitly specified by the 637 * application. We assume the next hop is an IPv6 638 * address. 639 */ 640 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 641 } 642 else if ((rt->rt_flags & RTF_GATEWAY)) 643 dst = (struct sockaddr_in6 *)rt->rt_gateway; 644 } 645 646 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 647 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 648 } else { 649 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 650 in6_ifstat_inc(ifp, ifs6_out_mcast); 651 /* 652 * Confirm that the outgoing interface supports multicast. 653 */ 654 if (!(ifp->if_flags & IFF_MULTICAST)) { 655 IP6STAT_INC(ip6s_noroute); 656 in6_ifstat_inc(ifp, ifs6_out_discard); 657 error = ENETUNREACH; 658 goto bad; 659 } 660 if ((im6o == NULL && in6_mcast_loop) || 661 (im6o && im6o->im6o_multicast_loop)) { 662 /* 663 * Loop back multicast datagram if not expressly 664 * forbidden to do so, even if we have not joined 665 * the address; protocols will filter it later, 666 * thus deferring a hash lookup and lock acquisition 667 * at the expense of an m_copym(). 668 */ 669 ip6_mloopback(ifp, m); 670 } else { 671 /* 672 * If we are acting as a multicast router, perform 673 * multicast forwarding as if the packet had just 674 * arrived on the interface to which we are about 675 * to send. The multicast forwarding function 676 * recursively calls this function, using the 677 * IPV6_FORWARDING flag to prevent infinite recursion. 678 * 679 * Multicasts that are looped back by ip6_mloopback(), 680 * above, will be forwarded by the ip6_input() routine, 681 * if necessary. 682 */ 683 if (V_ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 684 /* 685 * XXX: ip6_mforward expects that rcvif is NULL 686 * when it is called from the originating path. 687 * However, it may not always be the case. 688 */ 689 m->m_pkthdr.rcvif = NULL; 690 if (ip6_mforward(ip6, ifp, m) != 0) { 691 m_freem(m); 692 goto done; 693 } 694 } 695 } 696 /* 697 * Multicasts with a hoplimit of zero may be looped back, 698 * above, but must not be transmitted on a network. 699 * Also, multicasts addressed to the loopback interface 700 * are not sent -- the above call to ip6_mloopback() will 701 * loop back a copy if this host actually belongs to the 702 * destination group on the loopback interface. 703 */ 704 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 705 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 706 m_freem(m); 707 goto done; 708 } 709 } 710 711 /* 712 * Fill the outgoing inteface to tell the upper layer 713 * to increment per-interface statistics. 714 */ 715 if (ifpp) 716 *ifpp = ifp; 717 718 /* Determine path MTU. */ 719 if ((error = ip6_getpmtu(ro_pmtu, ro != ro_pmtu, ifp, &ip6->ip6_dst, 720 &mtu, &alwaysfrag, fibnum, *nexthdrp)) != 0) 721 goto bad; 722 723 /* 724 * The caller of this function may specify to use the minimum MTU 725 * in some cases. 726 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 727 * setting. The logic is a bit complicated; by default, unicast 728 * packets will follow path MTU while multicast packets will be sent at 729 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 730 * including unicast ones will be sent at the minimum MTU. Multicast 731 * packets will always be sent at the minimum MTU unless 732 * IP6PO_MINMTU_DISABLE is explicitly specified. 733 * See RFC 3542 for more details. 734 */ 735 if (mtu > IPV6_MMTU) { 736 if ((flags & IPV6_MINMTU)) 737 mtu = IPV6_MMTU; 738 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 739 mtu = IPV6_MMTU; 740 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 741 (opt == NULL || 742 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 743 mtu = IPV6_MMTU; 744 } 745 } 746 747 /* 748 * clear embedded scope identifiers if necessary. 749 * in6_clearscope will touch the addresses only when necessary. 750 */ 751 in6_clearscope(&ip6->ip6_src); 752 in6_clearscope(&ip6->ip6_dst); 753 754 /* 755 * If the outgoing packet contains a hop-by-hop options header, 756 * it must be examined and processed even by the source node. 757 * (RFC 2460, section 4.) 758 */ 759 if (exthdrs.ip6e_hbh) { 760 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 761 u_int32_t dummy; /* XXX unused */ 762 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 763 764 #ifdef DIAGNOSTIC 765 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 766 panic("ip6e_hbh is not contiguous"); 767 #endif 768 /* 769 * XXX: if we have to send an ICMPv6 error to the sender, 770 * we need the M_LOOP flag since icmp6_error() expects 771 * the IPv6 and the hop-by-hop options header are 772 * contiguous unless the flag is set. 773 */ 774 m->m_flags |= M_LOOP; 775 m->m_pkthdr.rcvif = ifp; 776 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 777 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 778 &dummy, &plen) < 0) { 779 /* m was already freed at this point */ 780 error = EINVAL;/* better error? */ 781 goto done; 782 } 783 m->m_flags &= ~M_LOOP; /* XXX */ 784 m->m_pkthdr.rcvif = NULL; 785 } 786 787 /* Jump over all PFIL processing if hooks are not active. */ 788 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 789 goto passout; 790 791 odst = ip6->ip6_dst; 792 /* Run through list of hooks for output packets. */ 793 error = pfil_run_hooks(&V_inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 794 if (error != 0 || m == NULL) 795 goto done; 796 /* adjust pointer */ 797 ip6 = mtod(m, struct ip6_hdr *); 798 799 needfiblookup = 0; 800 /* See if destination IP address was changed by packet filter. */ 801 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 802 m->m_flags |= M_SKIP_FIREWALL; 803 /* If destination is now ourself drop to ip6_input(). */ 804 if (in6_localip(&ip6->ip6_dst)) { 805 m->m_flags |= M_FASTFWD_OURS; 806 if (m->m_pkthdr.rcvif == NULL) 807 m->m_pkthdr.rcvif = V_loif; 808 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 809 m->m_pkthdr.csum_flags |= 810 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 811 m->m_pkthdr.csum_data = 0xffff; 812 } 813 #ifdef SCTP 814 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 815 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 816 #endif 817 error = netisr_queue(NETISR_IPV6, m); 818 goto done; 819 } else { 820 RO_RTFREE(ro); 821 needfiblookup = 1; /* Redo the routing table lookup. */ 822 if (ro->ro_lle) 823 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 824 ro->ro_lle = NULL; 825 } 826 } 827 /* See if fib was changed by packet filter. */ 828 if (fibnum != M_GETFIB(m)) { 829 m->m_flags |= M_SKIP_FIREWALL; 830 fibnum = M_GETFIB(m); 831 RO_RTFREE(ro); 832 needfiblookup = 1; 833 if (ro->ro_lle) 834 LLE_FREE(ro->ro_lle); /* zeros ro_lle */ 835 ro->ro_lle = NULL; 836 } 837 if (needfiblookup) 838 goto again; 839 840 /* See if local, if yes, send it to netisr. */ 841 if (m->m_flags & M_FASTFWD_OURS) { 842 if (m->m_pkthdr.rcvif == NULL) 843 m->m_pkthdr.rcvif = V_loif; 844 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 845 m->m_pkthdr.csum_flags |= 846 CSUM_DATA_VALID_IPV6 | CSUM_PSEUDO_HDR; 847 m->m_pkthdr.csum_data = 0xffff; 848 } 849 #ifdef SCTP 850 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) 851 m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID; 852 #endif 853 error = netisr_queue(NETISR_IPV6, m); 854 goto done; 855 } 856 /* Or forward to some other address? */ 857 if ((m->m_flags & M_IP6_NEXTHOP) && 858 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { 859 dst = (struct sockaddr_in6 *)&ro->ro_dst; 860 bcopy((fwd_tag+1), &dst_sa, sizeof(struct sockaddr_in6)); 861 m->m_flags |= M_SKIP_FIREWALL; 862 m->m_flags &= ~M_IP6_NEXTHOP; 863 m_tag_delete(m, fwd_tag); 864 goto again; 865 } 866 867 passout: 868 /* 869 * Send the packet to the outgoing interface. 870 * If necessary, do IPv6 fragmentation before sending. 871 * 872 * the logic here is rather complex: 873 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 874 * 1-a: send as is if tlen <= path mtu 875 * 1-b: fragment if tlen > path mtu 876 * 877 * 2: if user asks us not to fragment (dontfrag == 1) 878 * 2-a: send as is if tlen <= interface mtu 879 * 2-b: error if tlen > interface mtu 880 * 881 * 3: if we always need to attach fragment header (alwaysfrag == 1) 882 * always fragment 883 * 884 * 4: if dontfrag == 1 && alwaysfrag == 1 885 * error, as we cannot handle this conflicting request 886 */ 887 sw_csum = m->m_pkthdr.csum_flags; 888 if (!hdrsplit) { 889 tso = ((sw_csum & ifp->if_hwassist & CSUM_TSO) != 0) ? 1 : 0; 890 sw_csum &= ~ifp->if_hwassist; 891 } else 892 tso = 0; 893 /* 894 * If we added extension headers, we will not do TSO and calculate the 895 * checksums ourselves for now. 896 * XXX-BZ Need a framework to know when the NIC can handle it, even 897 * with ext. hdrs. 898 */ 899 if (sw_csum & CSUM_DELAY_DATA_IPV6) { 900 sw_csum &= ~CSUM_DELAY_DATA_IPV6; 901 in6_delayed_cksum(m, plen, sizeof(struct ip6_hdr)); 902 } 903 #ifdef SCTP 904 if (sw_csum & CSUM_SCTP_IPV6) { 905 sw_csum &= ~CSUM_SCTP_IPV6; 906 sctp_delayed_cksum(m, sizeof(struct ip6_hdr)); 907 } 908 #endif 909 m->m_pkthdr.csum_flags &= ifp->if_hwassist; 910 tlen = m->m_pkthdr.len; 911 912 if ((opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) || tso) 913 dontfrag = 1; 914 else 915 dontfrag = 0; 916 if (dontfrag && alwaysfrag) { /* case 4 */ 917 /* conflicting request - can't transmit */ 918 error = EMSGSIZE; 919 goto bad; 920 } 921 if (dontfrag && tlen > IN6_LINKMTU(ifp) && !tso) { /* case 2-b */ 922 /* 923 * Even if the DONTFRAG option is specified, we cannot send the 924 * packet when the data length is larger than the MTU of the 925 * outgoing interface. 926 * Notify the error by sending IPV6_PATHMTU ancillary data if 927 * application wanted to know the MTU value. Also return an 928 * error code (this is not described in the API spec). 929 */ 930 if (inp != NULL) 931 ip6_notify_pmtu(inp, &dst_sa, (u_int32_t)mtu); 932 error = EMSGSIZE; 933 goto bad; 934 } 935 936 /* 937 * transmit packet without fragmentation 938 */ 939 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 940 struct in6_ifaddr *ia6; 941 942 ip6 = mtod(m, struct ip6_hdr *); 943 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 944 if (ia6) { 945 /* Record statistics for this interface address. */ 946 counter_u64_add(ia6->ia_ifa.ifa_opackets, 1); 947 counter_u64_add(ia6->ia_ifa.ifa_obytes, 948 m->m_pkthdr.len); 949 ifa_free(&ia6->ia_ifa); 950 } 951 error = nd6_output_ifp(ifp, origifp, m, dst, 952 (struct route *)ro); 953 goto done; 954 } 955 956 /* 957 * try to fragment the packet. case 1-b and 3 958 */ 959 if (mtu < IPV6_MMTU) { 960 /* path MTU cannot be less than IPV6_MMTU */ 961 error = EMSGSIZE; 962 in6_ifstat_inc(ifp, ifs6_out_fragfail); 963 goto bad; 964 } else if (ip6->ip6_plen == 0) { 965 /* jumbo payload cannot be fragmented */ 966 error = EMSGSIZE; 967 in6_ifstat_inc(ifp, ifs6_out_fragfail); 968 goto bad; 969 } else { 970 u_char nextproto; 971 972 /* 973 * Too large for the destination or interface; 974 * fragment if possible. 975 * Must be able to put at least 8 bytes per fragment. 976 */ 977 hlen = unfragpartlen; 978 if (mtu > IPV6_MAXPACKET) 979 mtu = IPV6_MAXPACKET; 980 981 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 982 if (len < 8) { 983 error = EMSGSIZE; 984 in6_ifstat_inc(ifp, ifs6_out_fragfail); 985 goto bad; 986 } 987 988 /* 989 * If the interface will not calculate checksums on 990 * fragmented packets, then do it here. 991 * XXX-BZ handle the hw offloading case. Need flags. 992 */ 993 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 994 in6_delayed_cksum(m, plen, hlen); 995 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6; 996 } 997 #ifdef SCTP 998 if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) { 999 sctp_delayed_cksum(m, hlen); 1000 m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6; 1001 } 1002 #endif 1003 /* 1004 * Change the next header field of the last header in the 1005 * unfragmentable part. 1006 */ 1007 if (exthdrs.ip6e_rthdr) { 1008 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1009 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1010 } else if (exthdrs.ip6e_dest1) { 1011 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1012 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1013 } else if (exthdrs.ip6e_hbh) { 1014 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1015 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1016 } else { 1017 nextproto = ip6->ip6_nxt; 1018 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1019 } 1020 1021 /* 1022 * Loop through length of segment after first fragment, 1023 * make new header and copy data of each part and link onto 1024 * chain. 1025 */ 1026 m0 = m; 1027 id = htonl(ip6_randomid()); 1028 if ((error = ip6_fragment(ifp, m, hlen, nextproto, len, id))) 1029 goto sendorfree; 1030 1031 in6_ifstat_inc(ifp, ifs6_out_fragok); 1032 } 1033 1034 /* 1035 * Remove leading garbages. 1036 */ 1037 sendorfree: 1038 m = m0->m_nextpkt; 1039 m0->m_nextpkt = 0; 1040 m_freem(m0); 1041 for (m0 = m; m; m = m0) { 1042 m0 = m->m_nextpkt; 1043 m->m_nextpkt = 0; 1044 if (error == 0) { 1045 /* Record statistics for this interface address. */ 1046 if (ia) { 1047 counter_u64_add(ia->ia_ifa.ifa_opackets, 1); 1048 counter_u64_add(ia->ia_ifa.ifa_obytes, 1049 m->m_pkthdr.len); 1050 } 1051 error = nd6_output_ifp(ifp, origifp, m, dst, 1052 (struct route *)ro); 1053 } else 1054 m_freem(m); 1055 } 1056 1057 if (error == 0) 1058 IP6STAT_INC(ip6s_fragmented); 1059 1060 done: 1061 /* 1062 * Release the route if using our private route, or if 1063 * (with flowtable) we don't have our own reference. 1064 */ 1065 if (ro == &ip6route || 1066 (ro != NULL && ro->ro_flags & RT_NORTREF)) 1067 RO_RTFREE(ro); 1068 return (error); 1069 1070 freehdrs: 1071 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1072 m_freem(exthdrs.ip6e_dest1); 1073 m_freem(exthdrs.ip6e_rthdr); 1074 m_freem(exthdrs.ip6e_dest2); 1075 /* FALLTHROUGH */ 1076 bad: 1077 if (m) 1078 m_freem(m); 1079 goto done; 1080 } 1081 1082 static int 1083 ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) 1084 { 1085 struct mbuf *m; 1086 1087 if (hlen > MCLBYTES) 1088 return (ENOBUFS); /* XXX */ 1089 1090 if (hlen > MLEN) 1091 m = m_getcl(M_NOWAIT, MT_DATA, 0); 1092 else 1093 m = m_get(M_NOWAIT, MT_DATA); 1094 if (m == NULL) 1095 return (ENOBUFS); 1096 m->m_len = hlen; 1097 if (hdr) 1098 bcopy(hdr, mtod(m, caddr_t), hlen); 1099 1100 *mp = m; 1101 return (0); 1102 } 1103 1104 /* 1105 * Insert jumbo payload option. 1106 */ 1107 static int 1108 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1109 { 1110 struct mbuf *mopt; 1111 u_char *optbuf; 1112 u_int32_t v; 1113 1114 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1115 1116 /* 1117 * If there is no hop-by-hop options header, allocate new one. 1118 * If there is one but it doesn't have enough space to store the 1119 * jumbo payload option, allocate a cluster to store the whole options. 1120 * Otherwise, use it to store the options. 1121 */ 1122 if (exthdrs->ip6e_hbh == NULL) { 1123 mopt = m_get(M_NOWAIT, MT_DATA); 1124 if (mopt == NULL) 1125 return (ENOBUFS); 1126 mopt->m_len = JUMBOOPTLEN; 1127 optbuf = mtod(mopt, u_char *); 1128 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1129 exthdrs->ip6e_hbh = mopt; 1130 } else { 1131 struct ip6_hbh *hbh; 1132 1133 mopt = exthdrs->ip6e_hbh; 1134 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1135 /* 1136 * XXX assumption: 1137 * - exthdrs->ip6e_hbh is not referenced from places 1138 * other than exthdrs. 1139 * - exthdrs->ip6e_hbh is not an mbuf chain. 1140 */ 1141 int oldoptlen = mopt->m_len; 1142 struct mbuf *n; 1143 1144 /* 1145 * XXX: give up if the whole (new) hbh header does 1146 * not fit even in an mbuf cluster. 1147 */ 1148 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1149 return (ENOBUFS); 1150 1151 /* 1152 * As a consequence, we must always prepare a cluster 1153 * at this point. 1154 */ 1155 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1156 if (n == NULL) 1157 return (ENOBUFS); 1158 n->m_len = oldoptlen + JUMBOOPTLEN; 1159 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1160 oldoptlen); 1161 optbuf = mtod(n, caddr_t) + oldoptlen; 1162 m_freem(mopt); 1163 mopt = exthdrs->ip6e_hbh = n; 1164 } else { 1165 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1166 mopt->m_len += JUMBOOPTLEN; 1167 } 1168 optbuf[0] = IP6OPT_PADN; 1169 optbuf[1] = 1; 1170 1171 /* 1172 * Adjust the header length according to the pad and 1173 * the jumbo payload option. 1174 */ 1175 hbh = mtod(mopt, struct ip6_hbh *); 1176 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1177 } 1178 1179 /* fill in the option. */ 1180 optbuf[2] = IP6OPT_JUMBO; 1181 optbuf[3] = 4; 1182 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1183 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1184 1185 /* finally, adjust the packet header length */ 1186 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1187 1188 return (0); 1189 #undef JUMBOOPTLEN 1190 } 1191 1192 /* 1193 * Insert fragment header and copy unfragmentable header portions. 1194 */ 1195 static int 1196 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1197 struct ip6_frag **frghdrp) 1198 { 1199 struct mbuf *n, *mlast; 1200 1201 if (hlen > sizeof(struct ip6_hdr)) { 1202 n = m_copym(m0, sizeof(struct ip6_hdr), 1203 hlen - sizeof(struct ip6_hdr), M_NOWAIT); 1204 if (n == NULL) 1205 return (ENOBUFS); 1206 m->m_next = n; 1207 } else 1208 n = m; 1209 1210 /* Search for the last mbuf of unfragmentable part. */ 1211 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1212 ; 1213 1214 if (M_WRITABLE(mlast) && 1215 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1216 /* use the trailing space of the last mbuf for the fragment hdr */ 1217 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1218 mlast->m_len); 1219 mlast->m_len += sizeof(struct ip6_frag); 1220 m->m_pkthdr.len += sizeof(struct ip6_frag); 1221 } else { 1222 /* allocate a new mbuf for the fragment header */ 1223 struct mbuf *mfrg; 1224 1225 mfrg = m_get(M_NOWAIT, MT_DATA); 1226 if (mfrg == NULL) 1227 return (ENOBUFS); 1228 mfrg->m_len = sizeof(struct ip6_frag); 1229 *frghdrp = mtod(mfrg, struct ip6_frag *); 1230 mlast->m_next = mfrg; 1231 } 1232 1233 return (0); 1234 } 1235 1236 /* 1237 * Calculates IPv6 path mtu for destination @dst. 1238 * Resulting MTU is stored in @mtup. 1239 * 1240 * Returns 0 on success. 1241 */ 1242 static int 1243 ip6_getpmtu_ctl(u_int fibnum, const struct in6_addr *dst, u_long *mtup) 1244 { 1245 struct nhop6_extended nh6; 1246 struct in6_addr kdst; 1247 uint32_t scopeid; 1248 struct ifnet *ifp; 1249 u_long mtu; 1250 int error; 1251 1252 in6_splitscope(dst, &kdst, &scopeid); 1253 if (fib6_lookup_nh_ext(fibnum, &kdst, scopeid, NHR_REF, 0, &nh6) != 0) 1254 return (EHOSTUNREACH); 1255 1256 ifp = nh6.nh_ifp; 1257 mtu = nh6.nh_mtu; 1258 1259 error = ip6_calcmtu(ifp, dst, mtu, mtup, NULL, 0); 1260 fib6_free_nh_ext(fibnum, &nh6); 1261 1262 return (error); 1263 } 1264 1265 /* 1266 * Calculates IPv6 path MTU for @dst based on transmit @ifp, 1267 * and cached data in @ro_pmtu. 1268 * MTU from (successful) route lookup is saved (along with dst) 1269 * inside @ro_pmtu to avoid subsequent route lookups after packet 1270 * filter processing. 1271 * 1272 * Stores mtu and always-frag value into @mtup and @alwaysfragp. 1273 * Returns 0 on success. 1274 */ 1275 static int 1276 ip6_getpmtu(struct route_in6 *ro_pmtu, int do_lookup, 1277 struct ifnet *ifp, const struct in6_addr *dst, u_long *mtup, 1278 int *alwaysfragp, u_int fibnum, u_int proto) 1279 { 1280 struct nhop6_basic nh6; 1281 struct in6_addr kdst; 1282 uint32_t scopeid; 1283 struct sockaddr_in6 *sa6_dst; 1284 u_long mtu; 1285 1286 mtu = 0; 1287 if (do_lookup) { 1288 1289 /* 1290 * Here ro_pmtu has final destination address, while 1291 * ro might represent immediate destination. 1292 * Use ro_pmtu destination since mtu might differ. 1293 */ 1294 sa6_dst = (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1295 if (!IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst)) 1296 ro_pmtu->ro_mtu = 0; 1297 1298 if (ro_pmtu->ro_mtu == 0) { 1299 bzero(sa6_dst, sizeof(*sa6_dst)); 1300 sa6_dst->sin6_family = AF_INET6; 1301 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1302 sa6_dst->sin6_addr = *dst; 1303 1304 in6_splitscope(dst, &kdst, &scopeid); 1305 if (fib6_lookup_nh_basic(fibnum, &kdst, scopeid, 0, 0, 1306 &nh6) == 0) 1307 ro_pmtu->ro_mtu = nh6.nh_mtu; 1308 } 1309 1310 mtu = ro_pmtu->ro_mtu; 1311 } 1312 1313 if (ro_pmtu->ro_rt) 1314 mtu = ro_pmtu->ro_rt->rt_mtu; 1315 1316 return (ip6_calcmtu(ifp, dst, mtu, mtup, alwaysfragp, proto)); 1317 } 1318 1319 /* 1320 * Calculate MTU based on transmit @ifp, route mtu @rt_mtu and 1321 * hostcache data for @dst. 1322 * Stores mtu and always-frag value into @mtup and @alwaysfragp. 1323 * 1324 * Returns 0 on success. 1325 */ 1326 static int 1327 ip6_calcmtu(struct ifnet *ifp, const struct in6_addr *dst, u_long rt_mtu, 1328 u_long *mtup, int *alwaysfragp, u_int proto) 1329 { 1330 u_long mtu = 0; 1331 int alwaysfrag = 0; 1332 int error = 0; 1333 1334 if (rt_mtu > 0) { 1335 u_int32_t ifmtu; 1336 struct in_conninfo inc; 1337 1338 bzero(&inc, sizeof(inc)); 1339 inc.inc_flags |= INC_ISIPV6; 1340 inc.inc6_faddr = *dst; 1341 1342 ifmtu = IN6_LINKMTU(ifp); 1343 1344 /* TCP is known to react to pmtu changes so skip hc */ 1345 if (proto != IPPROTO_TCP) 1346 mtu = tcp_hc_getmtu(&inc); 1347 1348 if (mtu) 1349 mtu = min(mtu, rt_mtu); 1350 else 1351 mtu = rt_mtu; 1352 if (mtu == 0) 1353 mtu = ifmtu; 1354 else if (mtu < IPV6_MMTU) { 1355 /* 1356 * RFC2460 section 5, last paragraph: 1357 * if we record ICMPv6 too big message with 1358 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1359 * or smaller, with framgent header attached. 1360 * (fragment header is needed regardless from the 1361 * packet size, for translators to identify packets) 1362 */ 1363 alwaysfrag = 1; 1364 mtu = IPV6_MMTU; 1365 } 1366 } else if (ifp) { 1367 mtu = IN6_LINKMTU(ifp); 1368 } else 1369 error = EHOSTUNREACH; /* XXX */ 1370 1371 *mtup = mtu; 1372 if (alwaysfragp) 1373 *alwaysfragp = alwaysfrag; 1374 return (error); 1375 } 1376 1377 /* 1378 * IP6 socket option processing. 1379 */ 1380 int 1381 ip6_ctloutput(struct socket *so, struct sockopt *sopt) 1382 { 1383 int optdatalen, uproto; 1384 void *optdata; 1385 struct inpcb *in6p = sotoinpcb(so); 1386 int error, optval; 1387 int level, op, optname; 1388 int optlen; 1389 struct thread *td; 1390 #ifdef RSS 1391 uint32_t rss_bucket; 1392 int retval; 1393 #endif 1394 1395 /* 1396 * Don't use more than a quarter of mbuf clusters. N.B.: 1397 * nmbclusters is an int, but nmbclusters * MCLBYTES may overflow 1398 * on LP64 architectures, so cast to u_long to avoid undefined 1399 * behavior. ILP32 architectures cannot have nmbclusters 1400 * large enough to overflow for other reasons. 1401 */ 1402 #define IPV6_PKTOPTIONS_MBUF_LIMIT ((u_long)nmbclusters * MCLBYTES / 4) 1403 1404 level = sopt->sopt_level; 1405 op = sopt->sopt_dir; 1406 optname = sopt->sopt_name; 1407 optlen = sopt->sopt_valsize; 1408 td = sopt->sopt_td; 1409 error = 0; 1410 optval = 0; 1411 uproto = (int)so->so_proto->pr_protocol; 1412 1413 if (level != IPPROTO_IPV6) { 1414 error = EINVAL; 1415 1416 if (sopt->sopt_level == SOL_SOCKET && 1417 sopt->sopt_dir == SOPT_SET) { 1418 switch (sopt->sopt_name) { 1419 case SO_REUSEADDR: 1420 INP_WLOCK(in6p); 1421 if ((so->so_options & SO_REUSEADDR) != 0) 1422 in6p->inp_flags2 |= INP_REUSEADDR; 1423 else 1424 in6p->inp_flags2 &= ~INP_REUSEADDR; 1425 INP_WUNLOCK(in6p); 1426 error = 0; 1427 break; 1428 case SO_REUSEPORT: 1429 INP_WLOCK(in6p); 1430 if ((so->so_options & SO_REUSEPORT) != 0) 1431 in6p->inp_flags2 |= INP_REUSEPORT; 1432 else 1433 in6p->inp_flags2 &= ~INP_REUSEPORT; 1434 INP_WUNLOCK(in6p); 1435 error = 0; 1436 break; 1437 case SO_SETFIB: 1438 INP_WLOCK(in6p); 1439 in6p->inp_inc.inc_fibnum = so->so_fibnum; 1440 INP_WUNLOCK(in6p); 1441 error = 0; 1442 break; 1443 default: 1444 break; 1445 } 1446 } 1447 } else { /* level == IPPROTO_IPV6 */ 1448 switch (op) { 1449 1450 case SOPT_SET: 1451 switch (optname) { 1452 case IPV6_2292PKTOPTIONS: 1453 #ifdef IPV6_PKTOPTIONS 1454 case IPV6_PKTOPTIONS: 1455 #endif 1456 { 1457 struct mbuf *m; 1458 1459 if (optlen > IPV6_PKTOPTIONS_MBUF_LIMIT) { 1460 printf("ip6_ctloutput: mbuf limit hit\n"); 1461 error = ENOBUFS; 1462 break; 1463 } 1464 1465 error = soopt_getm(sopt, &m); /* XXX */ 1466 if (error != 0) 1467 break; 1468 error = soopt_mcopyin(sopt, m); /* XXX */ 1469 if (error != 0) 1470 break; 1471 error = ip6_pcbopts(&in6p->in6p_outputopts, 1472 m, so, sopt); 1473 m_freem(m); /* XXX */ 1474 break; 1475 } 1476 1477 /* 1478 * Use of some Hop-by-Hop options or some 1479 * Destination options, might require special 1480 * privilege. That is, normal applications 1481 * (without special privilege) might be forbidden 1482 * from setting certain options in outgoing packets, 1483 * and might never see certain options in received 1484 * packets. [RFC 2292 Section 6] 1485 * KAME specific note: 1486 * KAME prevents non-privileged users from sending or 1487 * receiving ANY hbh/dst options in order to avoid 1488 * overhead of parsing options in the kernel. 1489 */ 1490 case IPV6_RECVHOPOPTS: 1491 case IPV6_RECVDSTOPTS: 1492 case IPV6_RECVRTHDRDSTOPTS: 1493 if (td != NULL) { 1494 error = priv_check(td, 1495 PRIV_NETINET_SETHDROPTS); 1496 if (error) 1497 break; 1498 } 1499 /* FALLTHROUGH */ 1500 case IPV6_UNICAST_HOPS: 1501 case IPV6_HOPLIMIT: 1502 1503 case IPV6_RECVPKTINFO: 1504 case IPV6_RECVHOPLIMIT: 1505 case IPV6_RECVRTHDR: 1506 case IPV6_RECVPATHMTU: 1507 case IPV6_RECVTCLASS: 1508 case IPV6_RECVFLOWID: 1509 #ifdef RSS 1510 case IPV6_RECVRSSBUCKETID: 1511 #endif 1512 case IPV6_V6ONLY: 1513 case IPV6_AUTOFLOWLABEL: 1514 case IPV6_BINDANY: 1515 case IPV6_BINDMULTI: 1516 #ifdef RSS 1517 case IPV6_RSS_LISTEN_BUCKET: 1518 #endif 1519 if (optname == IPV6_BINDANY && td != NULL) { 1520 error = priv_check(td, 1521 PRIV_NETINET_BINDANY); 1522 if (error) 1523 break; 1524 } 1525 1526 if (optlen != sizeof(int)) { 1527 error = EINVAL; 1528 break; 1529 } 1530 error = sooptcopyin(sopt, &optval, 1531 sizeof optval, sizeof optval); 1532 if (error) 1533 break; 1534 switch (optname) { 1535 1536 case IPV6_UNICAST_HOPS: 1537 if (optval < -1 || optval >= 256) 1538 error = EINVAL; 1539 else { 1540 /* -1 = kernel default */ 1541 in6p->in6p_hops = optval; 1542 if ((in6p->inp_vflag & 1543 INP_IPV4) != 0) 1544 in6p->inp_ip_ttl = optval; 1545 } 1546 break; 1547 #define OPTSET(bit) \ 1548 do { \ 1549 INP_WLOCK(in6p); \ 1550 if (optval) \ 1551 in6p->inp_flags |= (bit); \ 1552 else \ 1553 in6p->inp_flags &= ~(bit); \ 1554 INP_WUNLOCK(in6p); \ 1555 } while (/*CONSTCOND*/ 0) 1556 #define OPTSET2292(bit) \ 1557 do { \ 1558 INP_WLOCK(in6p); \ 1559 in6p->inp_flags |= IN6P_RFC2292; \ 1560 if (optval) \ 1561 in6p->inp_flags |= (bit); \ 1562 else \ 1563 in6p->inp_flags &= ~(bit); \ 1564 INP_WUNLOCK(in6p); \ 1565 } while (/*CONSTCOND*/ 0) 1566 #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) 1567 1568 #define OPTSET2(bit, val) do { \ 1569 INP_WLOCK(in6p); \ 1570 if (val) \ 1571 in6p->inp_flags2 |= bit; \ 1572 else \ 1573 in6p->inp_flags2 &= ~bit; \ 1574 INP_WUNLOCK(in6p); \ 1575 } while (0) 1576 #define OPTBIT2(bit) (in6p->inp_flags2 & (bit) ? 1 : 0) 1577 1578 case IPV6_RECVPKTINFO: 1579 /* cannot mix with RFC2292 */ 1580 if (OPTBIT(IN6P_RFC2292)) { 1581 error = EINVAL; 1582 break; 1583 } 1584 OPTSET(IN6P_PKTINFO); 1585 break; 1586 1587 case IPV6_HOPLIMIT: 1588 { 1589 struct ip6_pktopts **optp; 1590 1591 /* cannot mix with RFC2292 */ 1592 if (OPTBIT(IN6P_RFC2292)) { 1593 error = EINVAL; 1594 break; 1595 } 1596 optp = &in6p->in6p_outputopts; 1597 error = ip6_pcbopt(IPV6_HOPLIMIT, 1598 (u_char *)&optval, sizeof(optval), 1599 optp, (td != NULL) ? td->td_ucred : 1600 NULL, uproto); 1601 break; 1602 } 1603 1604 case IPV6_RECVHOPLIMIT: 1605 /* cannot mix with RFC2292 */ 1606 if (OPTBIT(IN6P_RFC2292)) { 1607 error = EINVAL; 1608 break; 1609 } 1610 OPTSET(IN6P_HOPLIMIT); 1611 break; 1612 1613 case IPV6_RECVHOPOPTS: 1614 /* cannot mix with RFC2292 */ 1615 if (OPTBIT(IN6P_RFC2292)) { 1616 error = EINVAL; 1617 break; 1618 } 1619 OPTSET(IN6P_HOPOPTS); 1620 break; 1621 1622 case IPV6_RECVDSTOPTS: 1623 /* cannot mix with RFC2292 */ 1624 if (OPTBIT(IN6P_RFC2292)) { 1625 error = EINVAL; 1626 break; 1627 } 1628 OPTSET(IN6P_DSTOPTS); 1629 break; 1630 1631 case IPV6_RECVRTHDRDSTOPTS: 1632 /* cannot mix with RFC2292 */ 1633 if (OPTBIT(IN6P_RFC2292)) { 1634 error = EINVAL; 1635 break; 1636 } 1637 OPTSET(IN6P_RTHDRDSTOPTS); 1638 break; 1639 1640 case IPV6_RECVRTHDR: 1641 /* cannot mix with RFC2292 */ 1642 if (OPTBIT(IN6P_RFC2292)) { 1643 error = EINVAL; 1644 break; 1645 } 1646 OPTSET(IN6P_RTHDR); 1647 break; 1648 1649 case IPV6_RECVPATHMTU: 1650 /* 1651 * We ignore this option for TCP 1652 * sockets. 1653 * (RFC3542 leaves this case 1654 * unspecified.) 1655 */ 1656 if (uproto != IPPROTO_TCP) 1657 OPTSET(IN6P_MTU); 1658 break; 1659 1660 case IPV6_RECVFLOWID: 1661 OPTSET2(INP_RECVFLOWID, optval); 1662 break; 1663 1664 #ifdef RSS 1665 case IPV6_RECVRSSBUCKETID: 1666 OPTSET2(INP_RECVRSSBUCKETID, optval); 1667 break; 1668 #endif 1669 1670 case IPV6_V6ONLY: 1671 /* 1672 * make setsockopt(IPV6_V6ONLY) 1673 * available only prior to bind(2). 1674 * see ipng mailing list, Jun 22 2001. 1675 */ 1676 if (in6p->inp_lport || 1677 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1678 error = EINVAL; 1679 break; 1680 } 1681 OPTSET(IN6P_IPV6_V6ONLY); 1682 if (optval) 1683 in6p->inp_vflag &= ~INP_IPV4; 1684 else 1685 in6p->inp_vflag |= INP_IPV4; 1686 break; 1687 case IPV6_RECVTCLASS: 1688 /* cannot mix with RFC2292 XXX */ 1689 if (OPTBIT(IN6P_RFC2292)) { 1690 error = EINVAL; 1691 break; 1692 } 1693 OPTSET(IN6P_TCLASS); 1694 break; 1695 case IPV6_AUTOFLOWLABEL: 1696 OPTSET(IN6P_AUTOFLOWLABEL); 1697 break; 1698 1699 case IPV6_BINDANY: 1700 OPTSET(INP_BINDANY); 1701 break; 1702 1703 case IPV6_BINDMULTI: 1704 OPTSET2(INP_BINDMULTI, optval); 1705 break; 1706 #ifdef RSS 1707 case IPV6_RSS_LISTEN_BUCKET: 1708 if ((optval >= 0) && 1709 (optval < rss_getnumbuckets())) { 1710 in6p->inp_rss_listen_bucket = optval; 1711 OPTSET2(INP_RSS_BUCKET_SET, 1); 1712 } else { 1713 error = EINVAL; 1714 } 1715 break; 1716 #endif 1717 } 1718 break; 1719 1720 case IPV6_TCLASS: 1721 case IPV6_DONTFRAG: 1722 case IPV6_USE_MIN_MTU: 1723 case IPV6_PREFER_TEMPADDR: 1724 if (optlen != sizeof(optval)) { 1725 error = EINVAL; 1726 break; 1727 } 1728 error = sooptcopyin(sopt, &optval, 1729 sizeof optval, sizeof optval); 1730 if (error) 1731 break; 1732 { 1733 struct ip6_pktopts **optp; 1734 optp = &in6p->in6p_outputopts; 1735 error = ip6_pcbopt(optname, 1736 (u_char *)&optval, sizeof(optval), 1737 optp, (td != NULL) ? td->td_ucred : 1738 NULL, uproto); 1739 break; 1740 } 1741 1742 case IPV6_2292PKTINFO: 1743 case IPV6_2292HOPLIMIT: 1744 case IPV6_2292HOPOPTS: 1745 case IPV6_2292DSTOPTS: 1746 case IPV6_2292RTHDR: 1747 /* RFC 2292 */ 1748 if (optlen != sizeof(int)) { 1749 error = EINVAL; 1750 break; 1751 } 1752 error = sooptcopyin(sopt, &optval, 1753 sizeof optval, sizeof optval); 1754 if (error) 1755 break; 1756 switch (optname) { 1757 case IPV6_2292PKTINFO: 1758 OPTSET2292(IN6P_PKTINFO); 1759 break; 1760 case IPV6_2292HOPLIMIT: 1761 OPTSET2292(IN6P_HOPLIMIT); 1762 break; 1763 case IPV6_2292HOPOPTS: 1764 /* 1765 * Check super-user privilege. 1766 * See comments for IPV6_RECVHOPOPTS. 1767 */ 1768 if (td != NULL) { 1769 error = priv_check(td, 1770 PRIV_NETINET_SETHDROPTS); 1771 if (error) 1772 return (error); 1773 } 1774 OPTSET2292(IN6P_HOPOPTS); 1775 break; 1776 case IPV6_2292DSTOPTS: 1777 if (td != NULL) { 1778 error = priv_check(td, 1779 PRIV_NETINET_SETHDROPTS); 1780 if (error) 1781 return (error); 1782 } 1783 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1784 break; 1785 case IPV6_2292RTHDR: 1786 OPTSET2292(IN6P_RTHDR); 1787 break; 1788 } 1789 break; 1790 case IPV6_PKTINFO: 1791 case IPV6_HOPOPTS: 1792 case IPV6_RTHDR: 1793 case IPV6_DSTOPTS: 1794 case IPV6_RTHDRDSTOPTS: 1795 case IPV6_NEXTHOP: 1796 { 1797 /* new advanced API (RFC3542) */ 1798 u_char *optbuf; 1799 u_char optbuf_storage[MCLBYTES]; 1800 int optlen; 1801 struct ip6_pktopts **optp; 1802 1803 /* cannot mix with RFC2292 */ 1804 if (OPTBIT(IN6P_RFC2292)) { 1805 error = EINVAL; 1806 break; 1807 } 1808 1809 /* 1810 * We only ensure valsize is not too large 1811 * here. Further validation will be done 1812 * later. 1813 */ 1814 error = sooptcopyin(sopt, optbuf_storage, 1815 sizeof(optbuf_storage), 0); 1816 if (error) 1817 break; 1818 optlen = sopt->sopt_valsize; 1819 optbuf = optbuf_storage; 1820 optp = &in6p->in6p_outputopts; 1821 error = ip6_pcbopt(optname, optbuf, optlen, 1822 optp, (td != NULL) ? td->td_ucred : NULL, 1823 uproto); 1824 break; 1825 } 1826 #undef OPTSET 1827 1828 case IPV6_MULTICAST_IF: 1829 case IPV6_MULTICAST_HOPS: 1830 case IPV6_MULTICAST_LOOP: 1831 case IPV6_JOIN_GROUP: 1832 case IPV6_LEAVE_GROUP: 1833 case IPV6_MSFILTER: 1834 case MCAST_BLOCK_SOURCE: 1835 case MCAST_UNBLOCK_SOURCE: 1836 case MCAST_JOIN_GROUP: 1837 case MCAST_LEAVE_GROUP: 1838 case MCAST_JOIN_SOURCE_GROUP: 1839 case MCAST_LEAVE_SOURCE_GROUP: 1840 error = ip6_setmoptions(in6p, sopt); 1841 break; 1842 1843 case IPV6_PORTRANGE: 1844 error = sooptcopyin(sopt, &optval, 1845 sizeof optval, sizeof optval); 1846 if (error) 1847 break; 1848 1849 INP_WLOCK(in6p); 1850 switch (optval) { 1851 case IPV6_PORTRANGE_DEFAULT: 1852 in6p->inp_flags &= ~(INP_LOWPORT); 1853 in6p->inp_flags &= ~(INP_HIGHPORT); 1854 break; 1855 1856 case IPV6_PORTRANGE_HIGH: 1857 in6p->inp_flags &= ~(INP_LOWPORT); 1858 in6p->inp_flags |= INP_HIGHPORT; 1859 break; 1860 1861 case IPV6_PORTRANGE_LOW: 1862 in6p->inp_flags &= ~(INP_HIGHPORT); 1863 in6p->inp_flags |= INP_LOWPORT; 1864 break; 1865 1866 default: 1867 error = EINVAL; 1868 break; 1869 } 1870 INP_WUNLOCK(in6p); 1871 break; 1872 1873 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 1874 case IPV6_IPSEC_POLICY: 1875 if (IPSEC_ENABLED(ipv6)) { 1876 error = IPSEC_PCBCTL(ipv6, in6p, sopt); 1877 break; 1878 } 1879 /* FALLTHROUGH */ 1880 #endif /* IPSEC */ 1881 1882 default: 1883 error = ENOPROTOOPT; 1884 break; 1885 } 1886 break; 1887 1888 case SOPT_GET: 1889 switch (optname) { 1890 1891 case IPV6_2292PKTOPTIONS: 1892 #ifdef IPV6_PKTOPTIONS 1893 case IPV6_PKTOPTIONS: 1894 #endif 1895 /* 1896 * RFC3542 (effectively) deprecated the 1897 * semantics of the 2292-style pktoptions. 1898 * Since it was not reliable in nature (i.e., 1899 * applications had to expect the lack of some 1900 * information after all), it would make sense 1901 * to simplify this part by always returning 1902 * empty data. 1903 */ 1904 sopt->sopt_valsize = 0; 1905 break; 1906 1907 case IPV6_RECVHOPOPTS: 1908 case IPV6_RECVDSTOPTS: 1909 case IPV6_RECVRTHDRDSTOPTS: 1910 case IPV6_UNICAST_HOPS: 1911 case IPV6_RECVPKTINFO: 1912 case IPV6_RECVHOPLIMIT: 1913 case IPV6_RECVRTHDR: 1914 case IPV6_RECVPATHMTU: 1915 1916 case IPV6_V6ONLY: 1917 case IPV6_PORTRANGE: 1918 case IPV6_RECVTCLASS: 1919 case IPV6_AUTOFLOWLABEL: 1920 case IPV6_BINDANY: 1921 case IPV6_FLOWID: 1922 case IPV6_FLOWTYPE: 1923 case IPV6_RECVFLOWID: 1924 #ifdef RSS 1925 case IPV6_RSSBUCKETID: 1926 case IPV6_RECVRSSBUCKETID: 1927 #endif 1928 case IPV6_BINDMULTI: 1929 switch (optname) { 1930 1931 case IPV6_RECVHOPOPTS: 1932 optval = OPTBIT(IN6P_HOPOPTS); 1933 break; 1934 1935 case IPV6_RECVDSTOPTS: 1936 optval = OPTBIT(IN6P_DSTOPTS); 1937 break; 1938 1939 case IPV6_RECVRTHDRDSTOPTS: 1940 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1941 break; 1942 1943 case IPV6_UNICAST_HOPS: 1944 optval = in6p->in6p_hops; 1945 break; 1946 1947 case IPV6_RECVPKTINFO: 1948 optval = OPTBIT(IN6P_PKTINFO); 1949 break; 1950 1951 case IPV6_RECVHOPLIMIT: 1952 optval = OPTBIT(IN6P_HOPLIMIT); 1953 break; 1954 1955 case IPV6_RECVRTHDR: 1956 optval = OPTBIT(IN6P_RTHDR); 1957 break; 1958 1959 case IPV6_RECVPATHMTU: 1960 optval = OPTBIT(IN6P_MTU); 1961 break; 1962 1963 case IPV6_V6ONLY: 1964 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1965 break; 1966 1967 case IPV6_PORTRANGE: 1968 { 1969 int flags; 1970 flags = in6p->inp_flags; 1971 if (flags & INP_HIGHPORT) 1972 optval = IPV6_PORTRANGE_HIGH; 1973 else if (flags & INP_LOWPORT) 1974 optval = IPV6_PORTRANGE_LOW; 1975 else 1976 optval = 0; 1977 break; 1978 } 1979 case IPV6_RECVTCLASS: 1980 optval = OPTBIT(IN6P_TCLASS); 1981 break; 1982 1983 case IPV6_AUTOFLOWLABEL: 1984 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 1985 break; 1986 1987 case IPV6_BINDANY: 1988 optval = OPTBIT(INP_BINDANY); 1989 break; 1990 1991 case IPV6_FLOWID: 1992 optval = in6p->inp_flowid; 1993 break; 1994 1995 case IPV6_FLOWTYPE: 1996 optval = in6p->inp_flowtype; 1997 break; 1998 1999 case IPV6_RECVFLOWID: 2000 optval = OPTBIT2(INP_RECVFLOWID); 2001 break; 2002 #ifdef RSS 2003 case IPV6_RSSBUCKETID: 2004 retval = 2005 rss_hash2bucket(in6p->inp_flowid, 2006 in6p->inp_flowtype, 2007 &rss_bucket); 2008 if (retval == 0) 2009 optval = rss_bucket; 2010 else 2011 error = EINVAL; 2012 break; 2013 2014 case IPV6_RECVRSSBUCKETID: 2015 optval = OPTBIT2(INP_RECVRSSBUCKETID); 2016 break; 2017 #endif 2018 2019 case IPV6_BINDMULTI: 2020 optval = OPTBIT2(INP_BINDMULTI); 2021 break; 2022 2023 } 2024 if (error) 2025 break; 2026 error = sooptcopyout(sopt, &optval, 2027 sizeof optval); 2028 break; 2029 2030 case IPV6_PATHMTU: 2031 { 2032 u_long pmtu = 0; 2033 struct ip6_mtuinfo mtuinfo; 2034 2035 if (!(so->so_state & SS_ISCONNECTED)) 2036 return (ENOTCONN); 2037 /* 2038 * XXX: we dot not consider the case of source 2039 * routing, or optional information to specify 2040 * the outgoing interface. 2041 */ 2042 error = ip6_getpmtu_ctl(so->so_fibnum, 2043 &in6p->in6p_faddr, &pmtu); 2044 if (error) 2045 break; 2046 if (pmtu > IPV6_MAXPACKET) 2047 pmtu = IPV6_MAXPACKET; 2048 2049 bzero(&mtuinfo, sizeof(mtuinfo)); 2050 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2051 optdata = (void *)&mtuinfo; 2052 optdatalen = sizeof(mtuinfo); 2053 error = sooptcopyout(sopt, optdata, 2054 optdatalen); 2055 break; 2056 } 2057 2058 case IPV6_2292PKTINFO: 2059 case IPV6_2292HOPLIMIT: 2060 case IPV6_2292HOPOPTS: 2061 case IPV6_2292RTHDR: 2062 case IPV6_2292DSTOPTS: 2063 switch (optname) { 2064 case IPV6_2292PKTINFO: 2065 optval = OPTBIT(IN6P_PKTINFO); 2066 break; 2067 case IPV6_2292HOPLIMIT: 2068 optval = OPTBIT(IN6P_HOPLIMIT); 2069 break; 2070 case IPV6_2292HOPOPTS: 2071 optval = OPTBIT(IN6P_HOPOPTS); 2072 break; 2073 case IPV6_2292RTHDR: 2074 optval = OPTBIT(IN6P_RTHDR); 2075 break; 2076 case IPV6_2292DSTOPTS: 2077 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2078 break; 2079 } 2080 error = sooptcopyout(sopt, &optval, 2081 sizeof optval); 2082 break; 2083 case IPV6_PKTINFO: 2084 case IPV6_HOPOPTS: 2085 case IPV6_RTHDR: 2086 case IPV6_DSTOPTS: 2087 case IPV6_RTHDRDSTOPTS: 2088 case IPV6_NEXTHOP: 2089 case IPV6_TCLASS: 2090 case IPV6_DONTFRAG: 2091 case IPV6_USE_MIN_MTU: 2092 case IPV6_PREFER_TEMPADDR: 2093 error = ip6_getpcbopt(in6p->in6p_outputopts, 2094 optname, sopt); 2095 break; 2096 2097 case IPV6_MULTICAST_IF: 2098 case IPV6_MULTICAST_HOPS: 2099 case IPV6_MULTICAST_LOOP: 2100 case IPV6_MSFILTER: 2101 error = ip6_getmoptions(in6p, sopt); 2102 break; 2103 2104 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 2105 case IPV6_IPSEC_POLICY: 2106 if (IPSEC_ENABLED(ipv6)) { 2107 error = IPSEC_PCBCTL(ipv6, in6p, sopt); 2108 break; 2109 } 2110 /* FALLTHROUGH */ 2111 #endif /* IPSEC */ 2112 default: 2113 error = ENOPROTOOPT; 2114 break; 2115 } 2116 break; 2117 } 2118 } 2119 return (error); 2120 } 2121 2122 int 2123 ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) 2124 { 2125 int error = 0, optval, optlen; 2126 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2127 struct inpcb *in6p = sotoinpcb(so); 2128 int level, op, optname; 2129 2130 level = sopt->sopt_level; 2131 op = sopt->sopt_dir; 2132 optname = sopt->sopt_name; 2133 optlen = sopt->sopt_valsize; 2134 2135 if (level != IPPROTO_IPV6) { 2136 return (EINVAL); 2137 } 2138 2139 switch (optname) { 2140 case IPV6_CHECKSUM: 2141 /* 2142 * For ICMPv6 sockets, no modification allowed for checksum 2143 * offset, permit "no change" values to help existing apps. 2144 * 2145 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2146 * for an ICMPv6 socket will fail." 2147 * The current behavior does not meet RFC3542. 2148 */ 2149 switch (op) { 2150 case SOPT_SET: 2151 if (optlen != sizeof(int)) { 2152 error = EINVAL; 2153 break; 2154 } 2155 error = sooptcopyin(sopt, &optval, sizeof(optval), 2156 sizeof(optval)); 2157 if (error) 2158 break; 2159 if ((optval % 2) != 0) { 2160 /* the API assumes even offset values */ 2161 error = EINVAL; 2162 } else if (so->so_proto->pr_protocol == 2163 IPPROTO_ICMPV6) { 2164 if (optval != icmp6off) 2165 error = EINVAL; 2166 } else 2167 in6p->in6p_cksum = optval; 2168 break; 2169 2170 case SOPT_GET: 2171 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2172 optval = icmp6off; 2173 else 2174 optval = in6p->in6p_cksum; 2175 2176 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2177 break; 2178 2179 default: 2180 error = EINVAL; 2181 break; 2182 } 2183 break; 2184 2185 default: 2186 error = ENOPROTOOPT; 2187 break; 2188 } 2189 2190 return (error); 2191 } 2192 2193 /* 2194 * Set up IP6 options in pcb for insertion in output packets or 2195 * specifying behavior of outgoing packets. 2196 */ 2197 static int 2198 ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, 2199 struct socket *so, struct sockopt *sopt) 2200 { 2201 struct ip6_pktopts *opt = *pktopt; 2202 int error = 0; 2203 struct thread *td = sopt->sopt_td; 2204 2205 /* turn off any old options. */ 2206 if (opt) { 2207 #ifdef DIAGNOSTIC 2208 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2209 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2210 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2211 printf("ip6_pcbopts: all specified options are cleared.\n"); 2212 #endif 2213 ip6_clearpktopts(opt, -1); 2214 } else 2215 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2216 *pktopt = NULL; 2217 2218 if (!m || m->m_len == 0) { 2219 /* 2220 * Only turning off any previous options, regardless of 2221 * whether the opt is just created or given. 2222 */ 2223 free(opt, M_IP6OPT); 2224 return (0); 2225 } 2226 2227 /* set options specified by user. */ 2228 if ((error = ip6_setpktopts(m, opt, NULL, (td != NULL) ? 2229 td->td_ucred : NULL, so->so_proto->pr_protocol)) != 0) { 2230 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2231 free(opt, M_IP6OPT); 2232 return (error); 2233 } 2234 *pktopt = opt; 2235 return (0); 2236 } 2237 2238 /* 2239 * initialize ip6_pktopts. beware that there are non-zero default values in 2240 * the struct. 2241 */ 2242 void 2243 ip6_initpktopts(struct ip6_pktopts *opt) 2244 { 2245 2246 bzero(opt, sizeof(*opt)); 2247 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2248 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2249 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2250 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2251 } 2252 2253 static int 2254 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2255 struct ucred *cred, int uproto) 2256 { 2257 struct ip6_pktopts *opt; 2258 2259 if (*pktopt == NULL) { 2260 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2261 M_WAITOK); 2262 ip6_initpktopts(*pktopt); 2263 } 2264 opt = *pktopt; 2265 2266 return (ip6_setpktopt(optname, buf, len, opt, cred, 1, 0, uproto)); 2267 } 2268 2269 static int 2270 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2271 { 2272 void *optdata = NULL; 2273 int optdatalen = 0; 2274 struct ip6_ext *ip6e; 2275 int error = 0; 2276 struct in6_pktinfo null_pktinfo; 2277 int deftclass = 0, on; 2278 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2279 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2280 2281 switch (optname) { 2282 case IPV6_PKTINFO: 2283 optdata = (void *)&null_pktinfo; 2284 if (pktopt && pktopt->ip6po_pktinfo) { 2285 bcopy(pktopt->ip6po_pktinfo, &null_pktinfo, 2286 sizeof(null_pktinfo)); 2287 in6_clearscope(&null_pktinfo.ipi6_addr); 2288 } else { 2289 /* XXX: we don't have to do this every time... */ 2290 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2291 } 2292 optdatalen = sizeof(struct in6_pktinfo); 2293 break; 2294 case IPV6_TCLASS: 2295 if (pktopt && pktopt->ip6po_tclass >= 0) 2296 optdata = (void *)&pktopt->ip6po_tclass; 2297 else 2298 optdata = (void *)&deftclass; 2299 optdatalen = sizeof(int); 2300 break; 2301 case IPV6_HOPOPTS: 2302 if (pktopt && pktopt->ip6po_hbh) { 2303 optdata = (void *)pktopt->ip6po_hbh; 2304 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2305 optdatalen = (ip6e->ip6e_len + 1) << 3; 2306 } 2307 break; 2308 case IPV6_RTHDR: 2309 if (pktopt && pktopt->ip6po_rthdr) { 2310 optdata = (void *)pktopt->ip6po_rthdr; 2311 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2312 optdatalen = (ip6e->ip6e_len + 1) << 3; 2313 } 2314 break; 2315 case IPV6_RTHDRDSTOPTS: 2316 if (pktopt && pktopt->ip6po_dest1) { 2317 optdata = (void *)pktopt->ip6po_dest1; 2318 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2319 optdatalen = (ip6e->ip6e_len + 1) << 3; 2320 } 2321 break; 2322 case IPV6_DSTOPTS: 2323 if (pktopt && pktopt->ip6po_dest2) { 2324 optdata = (void *)pktopt->ip6po_dest2; 2325 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2326 optdatalen = (ip6e->ip6e_len + 1) << 3; 2327 } 2328 break; 2329 case IPV6_NEXTHOP: 2330 if (pktopt && pktopt->ip6po_nexthop) { 2331 optdata = (void *)pktopt->ip6po_nexthop; 2332 optdatalen = pktopt->ip6po_nexthop->sa_len; 2333 } 2334 break; 2335 case IPV6_USE_MIN_MTU: 2336 if (pktopt) 2337 optdata = (void *)&pktopt->ip6po_minmtu; 2338 else 2339 optdata = (void *)&defminmtu; 2340 optdatalen = sizeof(int); 2341 break; 2342 case IPV6_DONTFRAG: 2343 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2344 on = 1; 2345 else 2346 on = 0; 2347 optdata = (void *)&on; 2348 optdatalen = sizeof(on); 2349 break; 2350 case IPV6_PREFER_TEMPADDR: 2351 if (pktopt) 2352 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2353 else 2354 optdata = (void *)&defpreftemp; 2355 optdatalen = sizeof(int); 2356 break; 2357 default: /* should not happen */ 2358 #ifdef DIAGNOSTIC 2359 panic("ip6_getpcbopt: unexpected option\n"); 2360 #endif 2361 return (ENOPROTOOPT); 2362 } 2363 2364 error = sooptcopyout(sopt, optdata, optdatalen); 2365 2366 return (error); 2367 } 2368 2369 void 2370 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2371 { 2372 if (pktopt == NULL) 2373 return; 2374 2375 if (optname == -1 || optname == IPV6_PKTINFO) { 2376 if (pktopt->ip6po_pktinfo) 2377 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2378 pktopt->ip6po_pktinfo = NULL; 2379 } 2380 if (optname == -1 || optname == IPV6_HOPLIMIT) 2381 pktopt->ip6po_hlim = -1; 2382 if (optname == -1 || optname == IPV6_TCLASS) 2383 pktopt->ip6po_tclass = -1; 2384 if (optname == -1 || optname == IPV6_NEXTHOP) { 2385 if (pktopt->ip6po_nextroute.ro_rt) { 2386 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2387 pktopt->ip6po_nextroute.ro_rt = NULL; 2388 } 2389 if (pktopt->ip6po_nexthop) 2390 free(pktopt->ip6po_nexthop, M_IP6OPT); 2391 pktopt->ip6po_nexthop = NULL; 2392 } 2393 if (optname == -1 || optname == IPV6_HOPOPTS) { 2394 if (pktopt->ip6po_hbh) 2395 free(pktopt->ip6po_hbh, M_IP6OPT); 2396 pktopt->ip6po_hbh = NULL; 2397 } 2398 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2399 if (pktopt->ip6po_dest1) 2400 free(pktopt->ip6po_dest1, M_IP6OPT); 2401 pktopt->ip6po_dest1 = NULL; 2402 } 2403 if (optname == -1 || optname == IPV6_RTHDR) { 2404 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2405 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2406 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2407 if (pktopt->ip6po_route.ro_rt) { 2408 RTFREE(pktopt->ip6po_route.ro_rt); 2409 pktopt->ip6po_route.ro_rt = NULL; 2410 } 2411 } 2412 if (optname == -1 || optname == IPV6_DSTOPTS) { 2413 if (pktopt->ip6po_dest2) 2414 free(pktopt->ip6po_dest2, M_IP6OPT); 2415 pktopt->ip6po_dest2 = NULL; 2416 } 2417 } 2418 2419 #define PKTOPT_EXTHDRCPY(type) \ 2420 do {\ 2421 if (src->type) {\ 2422 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2423 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2424 if (dst->type == NULL && canwait == M_NOWAIT)\ 2425 goto bad;\ 2426 bcopy(src->type, dst->type, hlen);\ 2427 }\ 2428 } while (/*CONSTCOND*/ 0) 2429 2430 static int 2431 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2432 { 2433 if (dst == NULL || src == NULL) { 2434 printf("ip6_clearpktopts: invalid argument\n"); 2435 return (EINVAL); 2436 } 2437 2438 dst->ip6po_hlim = src->ip6po_hlim; 2439 dst->ip6po_tclass = src->ip6po_tclass; 2440 dst->ip6po_flags = src->ip6po_flags; 2441 dst->ip6po_minmtu = src->ip6po_minmtu; 2442 dst->ip6po_prefer_tempaddr = src->ip6po_prefer_tempaddr; 2443 if (src->ip6po_pktinfo) { 2444 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2445 M_IP6OPT, canwait); 2446 if (dst->ip6po_pktinfo == NULL) 2447 goto bad; 2448 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2449 } 2450 if (src->ip6po_nexthop) { 2451 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2452 M_IP6OPT, canwait); 2453 if (dst->ip6po_nexthop == NULL) 2454 goto bad; 2455 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2456 src->ip6po_nexthop->sa_len); 2457 } 2458 PKTOPT_EXTHDRCPY(ip6po_hbh); 2459 PKTOPT_EXTHDRCPY(ip6po_dest1); 2460 PKTOPT_EXTHDRCPY(ip6po_dest2); 2461 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2462 return (0); 2463 2464 bad: 2465 ip6_clearpktopts(dst, -1); 2466 return (ENOBUFS); 2467 } 2468 #undef PKTOPT_EXTHDRCPY 2469 2470 struct ip6_pktopts * 2471 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2472 { 2473 int error; 2474 struct ip6_pktopts *dst; 2475 2476 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2477 if (dst == NULL) 2478 return (NULL); 2479 ip6_initpktopts(dst); 2480 2481 if ((error = copypktopts(dst, src, canwait)) != 0) { 2482 free(dst, M_IP6OPT); 2483 return (NULL); 2484 } 2485 2486 return (dst); 2487 } 2488 2489 void 2490 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2491 { 2492 if (pktopt == NULL) 2493 return; 2494 2495 ip6_clearpktopts(pktopt, -1); 2496 2497 free(pktopt, M_IP6OPT); 2498 } 2499 2500 /* 2501 * Set IPv6 outgoing packet options based on advanced API. 2502 */ 2503 int 2504 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2505 struct ip6_pktopts *stickyopt, struct ucred *cred, int uproto) 2506 { 2507 struct cmsghdr *cm = NULL; 2508 2509 if (control == NULL || opt == NULL) 2510 return (EINVAL); 2511 2512 ip6_initpktopts(opt); 2513 if (stickyopt) { 2514 int error; 2515 2516 /* 2517 * If stickyopt is provided, make a local copy of the options 2518 * for this particular packet, then override them by ancillary 2519 * objects. 2520 * XXX: copypktopts() does not copy the cached route to a next 2521 * hop (if any). This is not very good in terms of efficiency, 2522 * but we can allow this since this option should be rarely 2523 * used. 2524 */ 2525 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2526 return (error); 2527 } 2528 2529 /* 2530 * XXX: Currently, we assume all the optional information is stored 2531 * in a single mbuf. 2532 */ 2533 if (control->m_next) 2534 return (EINVAL); 2535 2536 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2537 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2538 int error; 2539 2540 if (control->m_len < CMSG_LEN(0)) 2541 return (EINVAL); 2542 2543 cm = mtod(control, struct cmsghdr *); 2544 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2545 return (EINVAL); 2546 if (cm->cmsg_level != IPPROTO_IPV6) 2547 continue; 2548 2549 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2550 cm->cmsg_len - CMSG_LEN(0), opt, cred, 0, 1, uproto); 2551 if (error) 2552 return (error); 2553 } 2554 2555 return (0); 2556 } 2557 2558 /* 2559 * Set a particular packet option, as a sticky option or an ancillary data 2560 * item. "len" can be 0 only when it's a sticky option. 2561 * We have 4 cases of combination of "sticky" and "cmsg": 2562 * "sticky=0, cmsg=0": impossible 2563 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2564 * "sticky=1, cmsg=0": RFC3542 socket option 2565 * "sticky=1, cmsg=1": RFC2292 socket option 2566 */ 2567 static int 2568 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2569 struct ucred *cred, int sticky, int cmsg, int uproto) 2570 { 2571 int minmtupolicy, preftemp; 2572 int error; 2573 2574 if (!sticky && !cmsg) { 2575 #ifdef DIAGNOSTIC 2576 printf("ip6_setpktopt: impossible case\n"); 2577 #endif 2578 return (EINVAL); 2579 } 2580 2581 /* 2582 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2583 * not be specified in the context of RFC3542. Conversely, 2584 * RFC3542 types should not be specified in the context of RFC2292. 2585 */ 2586 if (!cmsg) { 2587 switch (optname) { 2588 case IPV6_2292PKTINFO: 2589 case IPV6_2292HOPLIMIT: 2590 case IPV6_2292NEXTHOP: 2591 case IPV6_2292HOPOPTS: 2592 case IPV6_2292DSTOPTS: 2593 case IPV6_2292RTHDR: 2594 case IPV6_2292PKTOPTIONS: 2595 return (ENOPROTOOPT); 2596 } 2597 } 2598 if (sticky && cmsg) { 2599 switch (optname) { 2600 case IPV6_PKTINFO: 2601 case IPV6_HOPLIMIT: 2602 case IPV6_NEXTHOP: 2603 case IPV6_HOPOPTS: 2604 case IPV6_DSTOPTS: 2605 case IPV6_RTHDRDSTOPTS: 2606 case IPV6_RTHDR: 2607 case IPV6_USE_MIN_MTU: 2608 case IPV6_DONTFRAG: 2609 case IPV6_TCLASS: 2610 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 2611 return (ENOPROTOOPT); 2612 } 2613 } 2614 2615 switch (optname) { 2616 case IPV6_2292PKTINFO: 2617 case IPV6_PKTINFO: 2618 { 2619 struct ifnet *ifp = NULL; 2620 struct in6_pktinfo *pktinfo; 2621 2622 if (len != sizeof(struct in6_pktinfo)) 2623 return (EINVAL); 2624 2625 pktinfo = (struct in6_pktinfo *)buf; 2626 2627 /* 2628 * An application can clear any sticky IPV6_PKTINFO option by 2629 * doing a "regular" setsockopt with ipi6_addr being 2630 * in6addr_any and ipi6_ifindex being zero. 2631 * [RFC 3542, Section 6] 2632 */ 2633 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2634 pktinfo->ipi6_ifindex == 0 && 2635 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2636 ip6_clearpktopts(opt, optname); 2637 break; 2638 } 2639 2640 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2641 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2642 return (EINVAL); 2643 } 2644 if (IN6_IS_ADDR_MULTICAST(&pktinfo->ipi6_addr)) 2645 return (EINVAL); 2646 /* validate the interface index if specified. */ 2647 if (pktinfo->ipi6_ifindex > V_if_index) 2648 return (ENXIO); 2649 if (pktinfo->ipi6_ifindex) { 2650 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 2651 if (ifp == NULL) 2652 return (ENXIO); 2653 } 2654 if (ifp != NULL && (ifp->if_afdata[AF_INET6] == NULL || 2655 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0)) 2656 return (ENETDOWN); 2657 2658 if (ifp != NULL && 2659 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2660 struct in6_ifaddr *ia; 2661 2662 in6_setscope(&pktinfo->ipi6_addr, ifp, NULL); 2663 ia = in6ifa_ifpwithaddr(ifp, &pktinfo->ipi6_addr); 2664 if (ia == NULL) 2665 return (EADDRNOTAVAIL); 2666 ifa_free(&ia->ia_ifa); 2667 } 2668 /* 2669 * We store the address anyway, and let in6_selectsrc() 2670 * validate the specified address. This is because ipi6_addr 2671 * may not have enough information about its scope zone, and 2672 * we may need additional information (such as outgoing 2673 * interface or the scope zone of a destination address) to 2674 * disambiguate the scope. 2675 * XXX: the delay of the validation may confuse the 2676 * application when it is used as a sticky option. 2677 */ 2678 if (opt->ip6po_pktinfo == NULL) { 2679 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2680 M_IP6OPT, M_NOWAIT); 2681 if (opt->ip6po_pktinfo == NULL) 2682 return (ENOBUFS); 2683 } 2684 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 2685 break; 2686 } 2687 2688 case IPV6_2292HOPLIMIT: 2689 case IPV6_HOPLIMIT: 2690 { 2691 int *hlimp; 2692 2693 /* 2694 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2695 * to simplify the ordering among hoplimit options. 2696 */ 2697 if (optname == IPV6_HOPLIMIT && sticky) 2698 return (ENOPROTOOPT); 2699 2700 if (len != sizeof(int)) 2701 return (EINVAL); 2702 hlimp = (int *)buf; 2703 if (*hlimp < -1 || *hlimp > 255) 2704 return (EINVAL); 2705 2706 opt->ip6po_hlim = *hlimp; 2707 break; 2708 } 2709 2710 case IPV6_TCLASS: 2711 { 2712 int tclass; 2713 2714 if (len != sizeof(int)) 2715 return (EINVAL); 2716 tclass = *(int *)buf; 2717 if (tclass < -1 || tclass > 255) 2718 return (EINVAL); 2719 2720 opt->ip6po_tclass = tclass; 2721 break; 2722 } 2723 2724 case IPV6_2292NEXTHOP: 2725 case IPV6_NEXTHOP: 2726 if (cred != NULL) { 2727 error = priv_check_cred(cred, 2728 PRIV_NETINET_SETHDROPTS, 0); 2729 if (error) 2730 return (error); 2731 } 2732 2733 if (len == 0) { /* just remove the option */ 2734 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2735 break; 2736 } 2737 2738 /* check if cmsg_len is large enough for sa_len */ 2739 if (len < sizeof(struct sockaddr) || len < *buf) 2740 return (EINVAL); 2741 2742 switch (((struct sockaddr *)buf)->sa_family) { 2743 case AF_INET6: 2744 { 2745 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 2746 int error; 2747 2748 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 2749 return (EINVAL); 2750 2751 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 2752 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 2753 return (EINVAL); 2754 } 2755 if ((error = sa6_embedscope(sa6, V_ip6_use_defzone)) 2756 != 0) { 2757 return (error); 2758 } 2759 break; 2760 } 2761 case AF_LINK: /* should eventually be supported */ 2762 default: 2763 return (EAFNOSUPPORT); 2764 } 2765 2766 /* turn off the previous option, then set the new option. */ 2767 ip6_clearpktopts(opt, IPV6_NEXTHOP); 2768 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 2769 if (opt->ip6po_nexthop == NULL) 2770 return (ENOBUFS); 2771 bcopy(buf, opt->ip6po_nexthop, *buf); 2772 break; 2773 2774 case IPV6_2292HOPOPTS: 2775 case IPV6_HOPOPTS: 2776 { 2777 struct ip6_hbh *hbh; 2778 int hbhlen; 2779 2780 /* 2781 * XXX: We don't allow a non-privileged user to set ANY HbH 2782 * options, since per-option restriction has too much 2783 * overhead. 2784 */ 2785 if (cred != NULL) { 2786 error = priv_check_cred(cred, 2787 PRIV_NETINET_SETHDROPTS, 0); 2788 if (error) 2789 return (error); 2790 } 2791 2792 if (len == 0) { 2793 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2794 break; /* just remove the option */ 2795 } 2796 2797 /* message length validation */ 2798 if (len < sizeof(struct ip6_hbh)) 2799 return (EINVAL); 2800 hbh = (struct ip6_hbh *)buf; 2801 hbhlen = (hbh->ip6h_len + 1) << 3; 2802 if (len != hbhlen) 2803 return (EINVAL); 2804 2805 /* turn off the previous option, then set the new option. */ 2806 ip6_clearpktopts(opt, IPV6_HOPOPTS); 2807 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 2808 if (opt->ip6po_hbh == NULL) 2809 return (ENOBUFS); 2810 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2811 2812 break; 2813 } 2814 2815 case IPV6_2292DSTOPTS: 2816 case IPV6_DSTOPTS: 2817 case IPV6_RTHDRDSTOPTS: 2818 { 2819 struct ip6_dest *dest, **newdest = NULL; 2820 int destlen; 2821 2822 if (cred != NULL) { /* XXX: see the comment for IPV6_HOPOPTS */ 2823 error = priv_check_cred(cred, 2824 PRIV_NETINET_SETHDROPTS, 0); 2825 if (error) 2826 return (error); 2827 } 2828 2829 if (len == 0) { 2830 ip6_clearpktopts(opt, optname); 2831 break; /* just remove the option */ 2832 } 2833 2834 /* message length validation */ 2835 if (len < sizeof(struct ip6_dest)) 2836 return (EINVAL); 2837 dest = (struct ip6_dest *)buf; 2838 destlen = (dest->ip6d_len + 1) << 3; 2839 if (len != destlen) 2840 return (EINVAL); 2841 2842 /* 2843 * Determine the position that the destination options header 2844 * should be inserted; before or after the routing header. 2845 */ 2846 switch (optname) { 2847 case IPV6_2292DSTOPTS: 2848 /* 2849 * The old advacned API is ambiguous on this point. 2850 * Our approach is to determine the position based 2851 * according to the existence of a routing header. 2852 * Note, however, that this depends on the order of the 2853 * extension headers in the ancillary data; the 1st 2854 * part of the destination options header must appear 2855 * before the routing header in the ancillary data, 2856 * too. 2857 * RFC3542 solved the ambiguity by introducing 2858 * separate ancillary data or option types. 2859 */ 2860 if (opt->ip6po_rthdr == NULL) 2861 newdest = &opt->ip6po_dest1; 2862 else 2863 newdest = &opt->ip6po_dest2; 2864 break; 2865 case IPV6_RTHDRDSTOPTS: 2866 newdest = &opt->ip6po_dest1; 2867 break; 2868 case IPV6_DSTOPTS: 2869 newdest = &opt->ip6po_dest2; 2870 break; 2871 } 2872 2873 /* turn off the previous option, then set the new option. */ 2874 ip6_clearpktopts(opt, optname); 2875 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 2876 if (*newdest == NULL) 2877 return (ENOBUFS); 2878 bcopy(dest, *newdest, destlen); 2879 2880 break; 2881 } 2882 2883 case IPV6_2292RTHDR: 2884 case IPV6_RTHDR: 2885 { 2886 struct ip6_rthdr *rth; 2887 int rthlen; 2888 2889 if (len == 0) { 2890 ip6_clearpktopts(opt, IPV6_RTHDR); 2891 break; /* just remove the option */ 2892 } 2893 2894 /* message length validation */ 2895 if (len < sizeof(struct ip6_rthdr)) 2896 return (EINVAL); 2897 rth = (struct ip6_rthdr *)buf; 2898 rthlen = (rth->ip6r_len + 1) << 3; 2899 if (len != rthlen) 2900 return (EINVAL); 2901 2902 switch (rth->ip6r_type) { 2903 case IPV6_RTHDR_TYPE_0: 2904 if (rth->ip6r_len == 0) /* must contain one addr */ 2905 return (EINVAL); 2906 if (rth->ip6r_len % 2) /* length must be even */ 2907 return (EINVAL); 2908 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2909 return (EINVAL); 2910 break; 2911 default: 2912 return (EINVAL); /* not supported */ 2913 } 2914 2915 /* turn off the previous option */ 2916 ip6_clearpktopts(opt, IPV6_RTHDR); 2917 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 2918 if (opt->ip6po_rthdr == NULL) 2919 return (ENOBUFS); 2920 bcopy(rth, opt->ip6po_rthdr, rthlen); 2921 2922 break; 2923 } 2924 2925 case IPV6_USE_MIN_MTU: 2926 if (len != sizeof(int)) 2927 return (EINVAL); 2928 minmtupolicy = *(int *)buf; 2929 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 2930 minmtupolicy != IP6PO_MINMTU_DISABLE && 2931 minmtupolicy != IP6PO_MINMTU_ALL) { 2932 return (EINVAL); 2933 } 2934 opt->ip6po_minmtu = minmtupolicy; 2935 break; 2936 2937 case IPV6_DONTFRAG: 2938 if (len != sizeof(int)) 2939 return (EINVAL); 2940 2941 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 2942 /* 2943 * we ignore this option for TCP sockets. 2944 * (RFC3542 leaves this case unspecified.) 2945 */ 2946 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 2947 } else 2948 opt->ip6po_flags |= IP6PO_DONTFRAG; 2949 break; 2950 2951 case IPV6_PREFER_TEMPADDR: 2952 if (len != sizeof(int)) 2953 return (EINVAL); 2954 preftemp = *(int *)buf; 2955 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 2956 preftemp != IP6PO_TEMPADDR_NOTPREFER && 2957 preftemp != IP6PO_TEMPADDR_PREFER) { 2958 return (EINVAL); 2959 } 2960 opt->ip6po_prefer_tempaddr = preftemp; 2961 break; 2962 2963 default: 2964 return (ENOPROTOOPT); 2965 } /* end of switch */ 2966 2967 return (0); 2968 } 2969 2970 /* 2971 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2972 * packet to the input queue of a specified interface. Note that this 2973 * calls the output routine of the loopback "driver", but with an interface 2974 * pointer that might NOT be &loif -- easier than replicating that code here. 2975 */ 2976 void 2977 ip6_mloopback(struct ifnet *ifp, struct mbuf *m) 2978 { 2979 struct mbuf *copym; 2980 struct ip6_hdr *ip6; 2981 2982 copym = m_copy(m, 0, M_COPYALL); 2983 if (copym == NULL) 2984 return; 2985 2986 /* 2987 * Make sure to deep-copy IPv6 header portion in case the data 2988 * is in an mbuf cluster, so that we can safely override the IPv6 2989 * header portion later. 2990 */ 2991 if (!M_WRITABLE(copym) || 2992 copym->m_len < sizeof(struct ip6_hdr)) { 2993 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2994 if (copym == NULL) 2995 return; 2996 } 2997 ip6 = mtod(copym, struct ip6_hdr *); 2998 /* 2999 * clear embedded scope identifiers if necessary. 3000 * in6_clearscope will touch the addresses only when necessary. 3001 */ 3002 in6_clearscope(&ip6->ip6_src); 3003 in6_clearscope(&ip6->ip6_dst); 3004 if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) { 3005 copym->m_pkthdr.csum_flags |= CSUM_DATA_VALID_IPV6 | 3006 CSUM_PSEUDO_HDR; 3007 copym->m_pkthdr.csum_data = 0xffff; 3008 } 3009 if_simloop(ifp, copym, AF_INET6, 0); 3010 } 3011 3012 /* 3013 * Chop IPv6 header off from the payload. 3014 */ 3015 static int 3016 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3017 { 3018 struct mbuf *mh; 3019 struct ip6_hdr *ip6; 3020 3021 ip6 = mtod(m, struct ip6_hdr *); 3022 if (m->m_len > sizeof(*ip6)) { 3023 mh = m_gethdr(M_NOWAIT, MT_DATA); 3024 if (mh == NULL) { 3025 m_freem(m); 3026 return ENOBUFS; 3027 } 3028 m_move_pkthdr(mh, m); 3029 M_ALIGN(mh, sizeof(*ip6)); 3030 m->m_len -= sizeof(*ip6); 3031 m->m_data += sizeof(*ip6); 3032 mh->m_next = m; 3033 m = mh; 3034 m->m_len = sizeof(*ip6); 3035 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3036 } 3037 exthdrs->ip6e_ip6 = m; 3038 return 0; 3039 } 3040 3041 /* 3042 * Compute IPv6 extension header length. 3043 */ 3044 int 3045 ip6_optlen(struct inpcb *in6p) 3046 { 3047 int len; 3048 3049 if (!in6p->in6p_outputopts) 3050 return 0; 3051 3052 len = 0; 3053 #define elen(x) \ 3054 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3055 3056 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3057 if (in6p->in6p_outputopts->ip6po_rthdr) 3058 /* dest1 is valid with rthdr only */ 3059 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3060 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3061 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3062 return len; 3063 #undef elen 3064 }
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