ip6_output.c revision 1.135.2.1.6.1
1 /* $NetBSD: ip6_output.c,v 1.135.2.1.6.1 2014/08/27 17:05:25 msaitoh Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.135.2.1.6.1 2014/08/27 17:05:25 msaitoh Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 #include <sys/kauth.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #ifdef PFIL_HOOKS 86 #include <net/pfil.h> 87 #endif 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet/in_offload.h> 94 #include <netinet6/in6_offload.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/ip6_private.h> 97 #include <netinet6/in6_pcb.h> 98 #include <netinet6/nd6.h> 99 #include <netinet6/ip6protosw.h> 100 #include <netinet6/scope6_var.h> 101 102 #ifdef IPSEC 103 #include <netinet6/ipsec.h> 104 #include <netinet6/ipsec_private.h> 105 #include <netkey/key.h> 106 #endif /* IPSEC */ 107 108 #ifdef FAST_IPSEC 109 #include <netipsec/ipsec.h> 110 #include <netipsec/ipsec6.h> 111 #include <netipsec/key.h> 112 #include <netipsec/xform.h> 113 #endif 114 115 116 #include <net/net_osdep.h> 117 118 #ifdef PFIL_HOOKS 119 extern struct pfil_head inet6_pfil_hook; /* XXX */ 120 #endif 121 122 struct ip6_exthdrs { 123 struct mbuf *ip6e_ip6; 124 struct mbuf *ip6e_hbh; 125 struct mbuf *ip6e_dest1; 126 struct mbuf *ip6e_rthdr; 127 struct mbuf *ip6e_dest2; 128 }; 129 130 static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, 131 int, int); 132 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 133 static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, int, 134 int, int, int); 135 static int ip6_setmoptions(const struct sockopt *, struct ip6_moptions **); 136 static int ip6_getmoptions(struct sockopt *, struct ip6_moptions *); 137 static int ip6_copyexthdr(struct mbuf **, void *, int); 138 static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, 139 struct ip6_frag **); 140 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 141 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 142 static int ip6_getpmtu(struct route *, struct route *, struct ifnet *, 143 const struct in6_addr *, u_long *, int *); 144 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 145 146 #ifdef RFC2292 147 static int ip6_pcbopts(struct ip6_pktopts **, struct socket *, struct sockopt *); 148 #endif 149 150 #define IN6_NEED_CHECKSUM(ifp, csum_flags) \ 151 (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \ 152 (((csum_flags) & M_CSUM_UDPv6) != 0 && udp_do_loopback_cksum) || \ 153 (((csum_flags) & M_CSUM_TCPv6) != 0 && tcp_do_loopback_cksum))) 154 155 /* 156 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 157 * header (with pri, len, nxt, hlim, src, dst). 158 * This function may modify ver and hlim only. 159 * The mbuf chain containing the packet will be freed. 160 * The mbuf opt, if present, will not be freed. 161 * 162 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 163 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 164 * which is rt_rmx.rmx_mtu. 165 */ 166 int 167 ip6_output( 168 struct mbuf *m0, 169 struct ip6_pktopts *opt, 170 struct route *ro, 171 int flags, 172 struct ip6_moptions *im6o, 173 struct socket *so, 174 struct ifnet **ifpp /* XXX: just for statistics */ 175 ) 176 { 177 struct ip6_hdr *ip6, *mhip6; 178 struct ifnet *ifp, *origifp; 179 struct mbuf *m = m0; 180 int hlen, tlen, len, off; 181 bool tso; 182 struct route ip6route; 183 struct rtentry *rt = NULL; 184 const struct sockaddr_in6 *dst = NULL; 185 struct sockaddr_in6 src_sa, dst_sa; 186 int error = 0; 187 struct in6_ifaddr *ia = NULL; 188 u_long mtu; 189 int alwaysfrag, dontfrag; 190 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 191 struct ip6_exthdrs exthdrs; 192 struct in6_addr finaldst, src0, dst0; 193 u_int32_t zone; 194 struct route *ro_pmtu = NULL; 195 int hdrsplit = 0; 196 int needipsec = 0; 197 #ifdef IPSEC 198 int needipsectun = 0; 199 struct secpolicy *sp = NULL; 200 201 ip6 = mtod(m, struct ip6_hdr *); 202 #endif /* IPSEC */ 203 #ifdef FAST_IPSEC 204 struct secpolicy *sp = NULL; 205 int s; 206 #endif 207 208 memset(&ip6route, 0, sizeof(ip6route)); 209 210 #ifdef DIAGNOSTIC 211 if ((m->m_flags & M_PKTHDR) == 0) 212 panic("ip6_output: no HDR"); 213 214 if ((m->m_pkthdr.csum_flags & 215 (M_CSUM_TCPv4|M_CSUM_UDPv4|M_CSUM_TSOv4)) != 0) { 216 panic("ip6_output: IPv4 checksum offload flags: %d", 217 m->m_pkthdr.csum_flags); 218 } 219 220 if ((m->m_pkthdr.csum_flags & (M_CSUM_TCPv6|M_CSUM_UDPv6)) == 221 (M_CSUM_TCPv6|M_CSUM_UDPv6)) { 222 panic("ip6_output: conflicting checksum offload flags: %d", 223 m->m_pkthdr.csum_flags); 224 } 225 #endif 226 227 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 228 229 #define MAKE_EXTHDR(hp, mp) \ 230 do { \ 231 if (hp) { \ 232 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 233 error = ip6_copyexthdr((mp), (void *)(hp), \ 234 ((eh)->ip6e_len + 1) << 3); \ 235 if (error) \ 236 goto freehdrs; \ 237 } \ 238 } while (/*CONSTCOND*/ 0) 239 240 bzero(&exthdrs, sizeof(exthdrs)); 241 if (opt) { 242 /* Hop-by-Hop options header */ 243 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 244 /* Destination options header(1st part) */ 245 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 246 /* Routing header */ 247 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 248 /* Destination options header(2nd part) */ 249 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 250 } 251 252 #ifdef IPSEC 253 if ((flags & IPV6_FORWARDING) != 0) { 254 needipsec = 0; 255 goto skippolicycheck; 256 } 257 258 /* get a security policy for this packet */ 259 if (so == NULL) 260 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 261 else { 262 if (IPSEC_PCB_SKIP_IPSEC(sotoinpcb_hdr(so)->inph_sp, 263 IPSEC_DIR_OUTBOUND)) { 264 needipsec = 0; 265 goto skippolicycheck; 266 } 267 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 268 } 269 270 if (sp == NULL) { 271 IPSEC6_STATINC(IPSEC_STAT_OUT_INVAL); 272 goto freehdrs; 273 } 274 275 error = 0; 276 277 /* check policy */ 278 switch (sp->policy) { 279 case IPSEC_POLICY_DISCARD: 280 /* 281 * This packet is just discarded. 282 */ 283 IPSEC6_STATINC(IPSEC_STAT_OUT_POLVIO); 284 goto freehdrs; 285 286 case IPSEC_POLICY_BYPASS: 287 case IPSEC_POLICY_NONE: 288 /* no need to do IPsec. */ 289 needipsec = 0; 290 break; 291 292 case IPSEC_POLICY_IPSEC: 293 if (sp->req == NULL) { 294 /* XXX should be panic ? */ 295 printf("ip6_output: No IPsec request specified.\n"); 296 error = EINVAL; 297 goto freehdrs; 298 } 299 needipsec = 1; 300 break; 301 302 case IPSEC_POLICY_ENTRUST: 303 default: 304 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 305 } 306 307 skippolicycheck:; 308 #endif /* IPSEC */ 309 310 /* 311 * Calculate the total length of the extension header chain. 312 * Keep the length of the unfragmentable part for fragmentation. 313 */ 314 optlen = 0; 315 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 316 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 317 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 318 unfragpartlen = optlen + sizeof(struct ip6_hdr); 319 /* NOTE: we don't add AH/ESP length here. do that later. */ 320 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 321 322 #ifdef FAST_IPSEC 323 /* Check the security policy (SP) for the packet */ 324 325 /* XXX For moment, we doesn't support packet with extented action */ 326 if (optlen !=0) 327 goto freehdrs; 328 329 sp = ipsec6_check_policy(m,so,flags,&needipsec,&error); 330 if (error != 0) { 331 /* 332 * Hack: -EINVAL is used to signal that a packet 333 * should be silently discarded. This is typically 334 * because we asked key management for an SA and 335 * it was delayed (e.g. kicked up to IKE). 336 */ 337 if (error == -EINVAL) 338 error = 0; 339 goto freehdrs; 340 } 341 #endif /* FAST_IPSEC */ 342 343 344 if (needipsec && 345 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 346 in6_delayed_cksum(m); 347 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 348 } 349 350 351 /* 352 * If we need IPsec, or there is at least one extension header, 353 * separate IP6 header from the payload. 354 */ 355 if ((needipsec || optlen) && !hdrsplit) { 356 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 357 m = NULL; 358 goto freehdrs; 359 } 360 m = exthdrs.ip6e_ip6; 361 hdrsplit++; 362 } 363 364 /* adjust pointer */ 365 ip6 = mtod(m, struct ip6_hdr *); 366 367 /* adjust mbuf packet header length */ 368 m->m_pkthdr.len += optlen; 369 plen = m->m_pkthdr.len - sizeof(*ip6); 370 371 /* If this is a jumbo payload, insert a jumbo payload option. */ 372 if (plen > IPV6_MAXPACKET) { 373 if (!hdrsplit) { 374 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 375 m = NULL; 376 goto freehdrs; 377 } 378 m = exthdrs.ip6e_ip6; 379 hdrsplit++; 380 } 381 /* adjust pointer */ 382 ip6 = mtod(m, struct ip6_hdr *); 383 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 384 goto freehdrs; 385 optlen += 8; /* XXX JUMBOOPTLEN */ 386 ip6->ip6_plen = 0; 387 } else 388 ip6->ip6_plen = htons(plen); 389 390 /* 391 * Concatenate headers and fill in next header fields. 392 * Here we have, on "m" 393 * IPv6 payload 394 * and we insert headers accordingly. Finally, we should be getting: 395 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 396 * 397 * during the header composing process, "m" points to IPv6 header. 398 * "mprev" points to an extension header prior to esp. 399 */ 400 { 401 u_char *nexthdrp = &ip6->ip6_nxt; 402 struct mbuf *mprev = m; 403 404 /* 405 * we treat dest2 specially. this makes IPsec processing 406 * much easier. the goal here is to make mprev point the 407 * mbuf prior to dest2. 408 * 409 * result: IPv6 dest2 payload 410 * m and mprev will point to IPv6 header. 411 */ 412 if (exthdrs.ip6e_dest2) { 413 if (!hdrsplit) 414 panic("assumption failed: hdr not split"); 415 exthdrs.ip6e_dest2->m_next = m->m_next; 416 m->m_next = exthdrs.ip6e_dest2; 417 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 418 ip6->ip6_nxt = IPPROTO_DSTOPTS; 419 } 420 421 #define MAKE_CHAIN(m, mp, p, i)\ 422 do {\ 423 if (m) {\ 424 if (!hdrsplit) \ 425 panic("assumption failed: hdr not split"); \ 426 *mtod((m), u_char *) = *(p);\ 427 *(p) = (i);\ 428 p = mtod((m), u_char *);\ 429 (m)->m_next = (mp)->m_next;\ 430 (mp)->m_next = (m);\ 431 (mp) = (m);\ 432 }\ 433 } while (/*CONSTCOND*/ 0) 434 /* 435 * result: IPv6 hbh dest1 rthdr dest2 payload 436 * m will point to IPv6 header. mprev will point to the 437 * extension header prior to dest2 (rthdr in the above case). 438 */ 439 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 440 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 441 IPPROTO_DSTOPTS); 442 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 443 IPPROTO_ROUTING); 444 445 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, 446 sizeof(struct ip6_hdr) + optlen); 447 448 #ifdef IPSEC 449 if (!needipsec) 450 goto skip_ipsec2; 451 452 /* 453 * pointers after IPsec headers are not valid any more. 454 * other pointers need a great care too. 455 * (IPsec routines should not mangle mbufs prior to AH/ESP) 456 */ 457 exthdrs.ip6e_dest2 = NULL; 458 459 { 460 struct ip6_rthdr *rh = NULL; 461 int segleft_org = 0; 462 struct ipsec_output_state state; 463 464 if (exthdrs.ip6e_rthdr) { 465 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 466 segleft_org = rh->ip6r_segleft; 467 rh->ip6r_segleft = 0; 468 } 469 470 bzero(&state, sizeof(state)); 471 state.m = m; 472 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 473 &needipsectun); 474 m = state.m; 475 if (error) { 476 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 477 /* mbuf is already reclaimed in ipsec6_output_trans. */ 478 m = NULL; 479 switch (error) { 480 case EHOSTUNREACH: 481 case ENETUNREACH: 482 case EMSGSIZE: 483 case ENOBUFS: 484 case ENOMEM: 485 break; 486 default: 487 printf("ip6_output (ipsec): error code %d\n", error); 488 /* FALLTHROUGH */ 489 case ENOENT: 490 /* don't show these error codes to the user */ 491 error = 0; 492 break; 493 } 494 goto bad; 495 } 496 if (exthdrs.ip6e_rthdr) { 497 /* ah6_output doesn't modify mbuf chain */ 498 rh->ip6r_segleft = segleft_org; 499 } 500 } 501 skip_ipsec2:; 502 #endif 503 } 504 505 /* 506 * If there is a routing header, replace destination address field 507 * with the first hop of the routing header. 508 */ 509 if (exthdrs.ip6e_rthdr) { 510 struct ip6_rthdr *rh; 511 struct ip6_rthdr0 *rh0; 512 struct in6_addr *addr; 513 struct sockaddr_in6 sa; 514 515 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 516 struct ip6_rthdr *)); 517 finaldst = ip6->ip6_dst; 518 switch (rh->ip6r_type) { 519 case IPV6_RTHDR_TYPE_0: 520 rh0 = (struct ip6_rthdr0 *)rh; 521 addr = (struct in6_addr *)(rh0 + 1); 522 523 /* 524 * construct a sockaddr_in6 form of 525 * the first hop. 526 * 527 * XXX: we may not have enough 528 * information about its scope zone; 529 * there is no standard API to pass 530 * the information from the 531 * application. 532 */ 533 sockaddr_in6_init(&sa, addr, 0, 0, 0); 534 if ((error = sa6_embedscope(&sa, 535 ip6_use_defzone)) != 0) { 536 goto bad; 537 } 538 ip6->ip6_dst = sa.sin6_addr; 539 (void)memmove(&addr[0], &addr[1], 540 sizeof(struct in6_addr) * 541 (rh0->ip6r0_segleft - 1)); 542 addr[rh0->ip6r0_segleft - 1] = finaldst; 543 /* XXX */ 544 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 545 break; 546 default: /* is it possible? */ 547 error = EINVAL; 548 goto bad; 549 } 550 } 551 552 /* Source address validation */ 553 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 554 (flags & IPV6_UNSPECSRC) == 0) { 555 error = EOPNOTSUPP; 556 IP6_STATINC(IP6_STAT_BADSCOPE); 557 goto bad; 558 } 559 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 560 error = EOPNOTSUPP; 561 IP6_STATINC(IP6_STAT_BADSCOPE); 562 goto bad; 563 } 564 565 IP6_STATINC(IP6_STAT_LOCALOUT); 566 567 /* 568 * Route packet. 569 */ 570 /* initialize cached route */ 571 if (ro == NULL) { 572 ro = &ip6route; 573 } 574 ro_pmtu = ro; 575 if (opt && opt->ip6po_rthdr) 576 ro = &opt->ip6po_route; 577 578 /* 579 * if specified, try to fill in the traffic class field. 580 * do not override if a non-zero value is already set. 581 * we check the diffserv field and the ecn field separately. 582 */ 583 if (opt && opt->ip6po_tclass >= 0) { 584 int mask = 0; 585 586 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 587 mask |= 0xfc; 588 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 589 mask |= 0x03; 590 if (mask != 0) 591 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 592 } 593 594 /* fill in or override the hop limit field, if necessary. */ 595 if (opt && opt->ip6po_hlim != -1) 596 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 597 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 598 if (im6o != NULL) 599 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 600 else 601 ip6->ip6_hlim = ip6_defmcasthlim; 602 } 603 604 #ifdef IPSEC 605 if (needipsec && needipsectun) { 606 struct ipsec_output_state state; 607 608 /* 609 * All the extension headers will become inaccessible 610 * (since they can be encrypted). 611 * Don't panic, we need no more updates to extension headers 612 * on inner IPv6 packet (since they are now encapsulated). 613 * 614 * IPv6 [ESP|AH] IPv6 [extension headers] payload 615 */ 616 bzero(&exthdrs, sizeof(exthdrs)); 617 exthdrs.ip6e_ip6 = m; 618 619 bzero(&state, sizeof(state)); 620 state.m = m; 621 state.ro = ro; 622 state.dst = rtcache_getdst(ro); 623 624 error = ipsec6_output_tunnel(&state, sp, flags); 625 626 m = state.m; 627 ro_pmtu = ro = state.ro; 628 dst = satocsin6(state.dst); 629 if (error) { 630 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 631 m0 = m = NULL; 632 m = NULL; 633 switch (error) { 634 case EHOSTUNREACH: 635 case ENETUNREACH: 636 case EMSGSIZE: 637 case ENOBUFS: 638 case ENOMEM: 639 break; 640 default: 641 printf("ip6_output (ipsec): error code %d\n", error); 642 /* FALLTHROUGH */ 643 case ENOENT: 644 /* don't show these error codes to the user */ 645 error = 0; 646 break; 647 } 648 goto bad; 649 } 650 651 exthdrs.ip6e_ip6 = m; 652 } 653 #endif /* IPSEC */ 654 #ifdef FAST_IPSEC 655 if (needipsec) { 656 s = splsoftnet(); 657 error = ipsec6_process_packet(m,sp->req); 658 659 /* 660 * Preserve KAME behaviour: ENOENT can be returned 661 * when an SA acquire is in progress. Don't propagate 662 * this to user-level; it confuses applications. 663 * XXX this will go away when the SADB is redone. 664 */ 665 if (error == ENOENT) 666 error = 0; 667 splx(s); 668 goto done; 669 } 670 #endif /* FAST_IPSEC */ 671 672 673 674 /* adjust pointer */ 675 ip6 = mtod(m, struct ip6_hdr *); 676 677 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 678 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 679 &ifp, &rt, 0)) != 0) { 680 if (ifp != NULL) 681 in6_ifstat_inc(ifp, ifs6_out_discard); 682 goto bad; 683 } 684 if (rt == NULL) { 685 /* 686 * If in6_selectroute() does not return a route entry, 687 * dst may not have been updated. 688 */ 689 rtcache_setdst(ro, sin6tosa(&dst_sa)); 690 } 691 692 /* 693 * then rt (for unicast) and ifp must be non-NULL valid values. 694 */ 695 if ((flags & IPV6_FORWARDING) == 0) { 696 /* XXX: the FORWARDING flag can be set for mrouting. */ 697 in6_ifstat_inc(ifp, ifs6_out_request); 698 } 699 if (rt != NULL) { 700 ia = (struct in6_ifaddr *)(rt->rt_ifa); 701 rt->rt_use++; 702 } 703 704 /* 705 * The outgoing interface must be in the zone of source and 706 * destination addresses. We should use ia_ifp to support the 707 * case of sending packets to an address of our own. 708 */ 709 if (ia != NULL && ia->ia_ifp) 710 origifp = ia->ia_ifp; 711 else 712 origifp = ifp; 713 714 src0 = ip6->ip6_src; 715 if (in6_setscope(&src0, origifp, &zone)) 716 goto badscope; 717 sockaddr_in6_init(&src_sa, &ip6->ip6_src, 0, 0, 0); 718 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 719 goto badscope; 720 721 dst0 = ip6->ip6_dst; 722 if (in6_setscope(&dst0, origifp, &zone)) 723 goto badscope; 724 /* re-initialize to be sure */ 725 sockaddr_in6_init(&dst_sa, &ip6->ip6_dst, 0, 0, 0); 726 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 727 goto badscope; 728 729 /* scope check is done. */ 730 731 if (rt == NULL || IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 732 if (dst == NULL) 733 dst = satocsin6(rtcache_getdst(ro)); 734 KASSERT(dst != NULL); 735 } else if (opt && rtcache_validate(&opt->ip6po_nextroute) != NULL) { 736 /* 737 * The nexthop is explicitly specified by the 738 * application. We assume the next hop is an IPv6 739 * address. 740 */ 741 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 742 } else if ((rt->rt_flags & RTF_GATEWAY)) 743 dst = (struct sockaddr_in6 *)rt->rt_gateway; 744 else if (dst == NULL) 745 dst = satocsin6(rtcache_getdst(ro)); 746 747 /* 748 * XXXXXX: original code follows: 749 */ 750 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 751 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 752 else { 753 struct in6_multi *in6m; 754 755 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 756 757 in6_ifstat_inc(ifp, ifs6_out_mcast); 758 759 /* 760 * Confirm that the outgoing interface supports multicast. 761 */ 762 if (!(ifp->if_flags & IFF_MULTICAST)) { 763 IP6_STATINC(IP6_STAT_NOROUTE); 764 in6_ifstat_inc(ifp, ifs6_out_discard); 765 error = ENETUNREACH; 766 goto bad; 767 } 768 769 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 770 if (in6m != NULL && 771 (im6o == NULL || im6o->im6o_multicast_loop)) { 772 /* 773 * If we belong to the destination multicast group 774 * on the outgoing interface, and the caller did not 775 * forbid loopback, loop back a copy. 776 */ 777 KASSERT(dst != NULL); 778 ip6_mloopback(ifp, m, dst); 779 } else { 780 /* 781 * If we are acting as a multicast router, perform 782 * multicast forwarding as if the packet had just 783 * arrived on the interface to which we are about 784 * to send. The multicast forwarding function 785 * recursively calls this function, using the 786 * IPV6_FORWARDING flag to prevent infinite recursion. 787 * 788 * Multicasts that are looped back by ip6_mloopback(), 789 * above, will be forwarded by the ip6_input() routine, 790 * if necessary. 791 */ 792 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 793 if (ip6_mforward(ip6, ifp, m) != 0) { 794 m_freem(m); 795 goto done; 796 } 797 } 798 } 799 /* 800 * Multicasts with a hoplimit of zero may be looped back, 801 * above, but must not be transmitted on a network. 802 * Also, multicasts addressed to the loopback interface 803 * are not sent -- the above call to ip6_mloopback() will 804 * loop back a copy if this host actually belongs to the 805 * destination group on the loopback interface. 806 */ 807 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 808 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 809 m_freem(m); 810 goto done; 811 } 812 } 813 814 /* 815 * Fill the outgoing inteface to tell the upper layer 816 * to increment per-interface statistics. 817 */ 818 if (ifpp) 819 *ifpp = ifp; 820 821 /* Determine path MTU. */ 822 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 823 &alwaysfrag)) != 0) 824 goto bad; 825 #ifdef IPSEC 826 if (needipsectun) 827 mtu = IPV6_MMTU; 828 #endif 829 830 /* 831 * The caller of this function may specify to use the minimum MTU 832 * in some cases. 833 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 834 * setting. The logic is a bit complicated; by default, unicast 835 * packets will follow path MTU while multicast packets will be sent at 836 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 837 * including unicast ones will be sent at the minimum MTU. Multicast 838 * packets will always be sent at the minimum MTU unless 839 * IP6PO_MINMTU_DISABLE is explicitly specified. 840 * See RFC 3542 for more details. 841 */ 842 if (mtu > IPV6_MMTU) { 843 if ((flags & IPV6_MINMTU)) 844 mtu = IPV6_MMTU; 845 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 846 mtu = IPV6_MMTU; 847 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 848 (opt == NULL || 849 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 850 mtu = IPV6_MMTU; 851 } 852 } 853 854 /* 855 * clear embedded scope identifiers if necessary. 856 * in6_clearscope will touch the addresses only when necessary. 857 */ 858 in6_clearscope(&ip6->ip6_src); 859 in6_clearscope(&ip6->ip6_dst); 860 861 /* 862 * If the outgoing packet contains a hop-by-hop options header, 863 * it must be examined and processed even by the source node. 864 * (RFC 2460, section 4.) 865 */ 866 if (exthdrs.ip6e_hbh) { 867 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 868 u_int32_t dummy1; /* XXX unused */ 869 u_int32_t dummy2; /* XXX unused */ 870 871 /* 872 * XXX: if we have to send an ICMPv6 error to the sender, 873 * we need the M_LOOP flag since icmp6_error() expects 874 * the IPv6 and the hop-by-hop options header are 875 * continuous unless the flag is set. 876 */ 877 m->m_flags |= M_LOOP; 878 m->m_pkthdr.rcvif = ifp; 879 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 880 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 881 &dummy1, &dummy2) < 0) { 882 /* m was already freed at this point */ 883 error = EINVAL;/* better error? */ 884 goto done; 885 } 886 m->m_flags &= ~M_LOOP; /* XXX */ 887 m->m_pkthdr.rcvif = NULL; 888 } 889 890 #ifdef PFIL_HOOKS 891 /* 892 * Run through list of hooks for output packets. 893 */ 894 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 895 goto done; 896 if (m == NULL) 897 goto done; 898 ip6 = mtod(m, struct ip6_hdr *); 899 #endif /* PFIL_HOOKS */ 900 /* 901 * Send the packet to the outgoing interface. 902 * If necessary, do IPv6 fragmentation before sending. 903 * 904 * the logic here is rather complex: 905 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 906 * 1-a: send as is if tlen <= path mtu 907 * 1-b: fragment if tlen > path mtu 908 * 909 * 2: if user asks us not to fragment (dontfrag == 1) 910 * 2-a: send as is if tlen <= interface mtu 911 * 2-b: error if tlen > interface mtu 912 * 913 * 3: if we always need to attach fragment header (alwaysfrag == 1) 914 * always fragment 915 * 916 * 4: if dontfrag == 1 && alwaysfrag == 1 917 * error, as we cannot handle this conflicting request 918 */ 919 tlen = m->m_pkthdr.len; 920 tso = (m->m_pkthdr.csum_flags & M_CSUM_TSOv6) != 0; 921 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 922 dontfrag = 1; 923 else 924 dontfrag = 0; 925 926 if (dontfrag && alwaysfrag) { /* case 4 */ 927 /* conflicting request - can't transmit */ 928 error = EMSGSIZE; 929 goto bad; 930 } 931 if (dontfrag && (!tso && tlen > IN6_LINKMTU(ifp))) { /* case 2-b */ 932 /* 933 * Even if the DONTFRAG option is specified, we cannot send the 934 * packet when the data length is larger than the MTU of the 935 * outgoing interface. 936 * Notify the error by sending IPV6_PATHMTU ancillary data as 937 * well as returning an error code (the latter is not described 938 * in the API spec.) 939 */ 940 u_int32_t mtu32; 941 struct ip6ctlparam ip6cp; 942 943 mtu32 = (u_int32_t)mtu; 944 bzero(&ip6cp, sizeof(ip6cp)); 945 ip6cp.ip6c_cmdarg = (void *)&mtu32; 946 pfctlinput2(PRC_MSGSIZE, 947 rtcache_getdst(ro_pmtu), &ip6cp); 948 949 error = EMSGSIZE; 950 goto bad; 951 } 952 953 /* 954 * transmit packet without fragmentation 955 */ 956 if (dontfrag || (!alwaysfrag && (tlen <= mtu || tso))) { 957 /* case 1-a and 2-a */ 958 struct in6_ifaddr *ia6; 959 int sw_csum; 960 961 ip6 = mtod(m, struct ip6_hdr *); 962 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 963 if (ia6) { 964 /* Record statistics for this interface address. */ 965 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 966 } 967 #ifdef IPSEC 968 /* clean ipsec history once it goes out of the node */ 969 ipsec_delaux(m); 970 #endif 971 972 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 973 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 974 if (IN6_NEED_CHECKSUM(ifp, 975 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 976 in6_delayed_cksum(m); 977 } 978 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 979 } 980 981 KASSERT(dst != NULL); 982 if (__predict_true(!tso || 983 (ifp->if_capenable & IFCAP_TSOv6) != 0)) { 984 error = nd6_output(ifp, origifp, m, dst, rt); 985 } else { 986 error = ip6_tso_output(ifp, origifp, m, dst, rt); 987 } 988 goto done; 989 } 990 991 if (tso) { 992 error = EINVAL; /* XXX */ 993 goto bad; 994 } 995 996 /* 997 * try to fragment the packet. case 1-b and 3 998 */ 999 if (mtu < IPV6_MMTU) { 1000 /* path MTU cannot be less than IPV6_MMTU */ 1001 error = EMSGSIZE; 1002 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1003 goto bad; 1004 } else if (ip6->ip6_plen == 0) { 1005 /* jumbo payload cannot be fragmented */ 1006 error = EMSGSIZE; 1007 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1008 goto bad; 1009 } else { 1010 struct mbuf **mnext, *m_frgpart; 1011 struct ip6_frag *ip6f; 1012 u_int32_t id = htonl(ip6_randomid()); 1013 u_char nextproto; 1014 #if 0 /* see below */ 1015 struct ip6ctlparam ip6cp; 1016 u_int32_t mtu32; 1017 #endif 1018 1019 /* 1020 * Too large for the destination or interface; 1021 * fragment if possible. 1022 * Must be able to put at least 8 bytes per fragment. 1023 */ 1024 hlen = unfragpartlen; 1025 if (mtu > IPV6_MAXPACKET) 1026 mtu = IPV6_MAXPACKET; 1027 1028 #if 0 1029 /* 1030 * It is believed this code is a leftover from the 1031 * development of the IPV6_RECVPATHMTU sockopt and 1032 * associated work to implement RFC3542. 1033 * It's not entirely clear what the intent of the API 1034 * is at this point, so disable this code for now. 1035 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 1036 * will send notifications if the application requests. 1037 */ 1038 1039 /* Notify a proper path MTU to applications. */ 1040 mtu32 = (u_int32_t)mtu; 1041 bzero(&ip6cp, sizeof(ip6cp)); 1042 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1043 pfctlinput2(PRC_MSGSIZE, 1044 rtcache_getdst(ro_pmtu), &ip6cp); 1045 #endif 1046 1047 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1048 if (len < 8) { 1049 error = EMSGSIZE; 1050 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1051 goto bad; 1052 } 1053 1054 mnext = &m->m_nextpkt; 1055 1056 /* 1057 * Change the next header field of the last header in the 1058 * unfragmentable part. 1059 */ 1060 if (exthdrs.ip6e_rthdr) { 1061 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1062 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1063 } else if (exthdrs.ip6e_dest1) { 1064 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1065 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1066 } else if (exthdrs.ip6e_hbh) { 1067 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1068 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1069 } else { 1070 nextproto = ip6->ip6_nxt; 1071 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1072 } 1073 1074 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 1075 != 0) { 1076 if (IN6_NEED_CHECKSUM(ifp, 1077 m->m_pkthdr.csum_flags & 1078 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 1079 in6_delayed_cksum(m); 1080 } 1081 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 1082 } 1083 1084 /* 1085 * Loop through length of segment after first fragment, 1086 * make new header and copy data of each part and link onto 1087 * chain. 1088 */ 1089 m0 = m; 1090 for (off = hlen; off < tlen; off += len) { 1091 struct mbuf *mlast; 1092 1093 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1094 if (!m) { 1095 error = ENOBUFS; 1096 IP6_STATINC(IP6_STAT_ODROPPED); 1097 goto sendorfree; 1098 } 1099 m->m_pkthdr.rcvif = NULL; 1100 m->m_flags = m0->m_flags & M_COPYFLAGS; 1101 *mnext = m; 1102 mnext = &m->m_nextpkt; 1103 m->m_data += max_linkhdr; 1104 mhip6 = mtod(m, struct ip6_hdr *); 1105 *mhip6 = *ip6; 1106 m->m_len = sizeof(*mhip6); 1107 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1108 if (error) { 1109 IP6_STATINC(IP6_STAT_ODROPPED); 1110 goto sendorfree; 1111 } 1112 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 1113 if (off + len >= tlen) 1114 len = tlen - off; 1115 else 1116 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1117 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 1118 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1119 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1120 error = ENOBUFS; 1121 IP6_STATINC(IP6_STAT_ODROPPED); 1122 goto sendorfree; 1123 } 1124 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 1125 ; 1126 mlast->m_next = m_frgpart; 1127 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1128 m->m_pkthdr.rcvif = (struct ifnet *)0; 1129 ip6f->ip6f_reserved = 0; 1130 ip6f->ip6f_ident = id; 1131 ip6f->ip6f_nxt = nextproto; 1132 IP6_STATINC(IP6_STAT_OFRAGMENTS); 1133 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1134 } 1135 1136 in6_ifstat_inc(ifp, ifs6_out_fragok); 1137 } 1138 1139 /* 1140 * Remove leading garbages. 1141 */ 1142 sendorfree: 1143 m = m0->m_nextpkt; 1144 m0->m_nextpkt = 0; 1145 m_freem(m0); 1146 for (m0 = m; m; m = m0) { 1147 m0 = m->m_nextpkt; 1148 m->m_nextpkt = 0; 1149 if (error == 0) { 1150 struct in6_ifaddr *ia6; 1151 ip6 = mtod(m, struct ip6_hdr *); 1152 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1153 if (ia6) { 1154 /* 1155 * Record statistics for this interface 1156 * address. 1157 */ 1158 ia6->ia_ifa.ifa_data.ifad_outbytes += 1159 m->m_pkthdr.len; 1160 } 1161 #ifdef IPSEC 1162 /* clean ipsec history once it goes out of the node */ 1163 ipsec_delaux(m); 1164 #endif 1165 KASSERT(dst != NULL); 1166 error = nd6_output(ifp, origifp, m, dst, rt); 1167 } else 1168 m_freem(m); 1169 } 1170 1171 if (error == 0) 1172 IP6_STATINC(IP6_STAT_FRAGMENTED); 1173 1174 done: 1175 rtcache_free(&ip6route); 1176 1177 #ifdef IPSEC 1178 if (sp != NULL) 1179 key_freesp(sp); 1180 #endif /* IPSEC */ 1181 #ifdef FAST_IPSEC 1182 if (sp != NULL) 1183 KEY_FREESP(&sp); 1184 #endif /* FAST_IPSEC */ 1185 1186 1187 return (error); 1188 1189 freehdrs: 1190 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1191 m_freem(exthdrs.ip6e_dest1); 1192 m_freem(exthdrs.ip6e_rthdr); 1193 m_freem(exthdrs.ip6e_dest2); 1194 /* FALLTHROUGH */ 1195 bad: 1196 m_freem(m); 1197 goto done; 1198 badscope: 1199 IP6_STATINC(IP6_STAT_BADSCOPE); 1200 in6_ifstat_inc(origifp, ifs6_out_discard); 1201 if (error == 0) 1202 error = EHOSTUNREACH; /* XXX */ 1203 goto bad; 1204 } 1205 1206 static int 1207 ip6_copyexthdr(struct mbuf **mp, void *hdr, int hlen) 1208 { 1209 struct mbuf *m; 1210 1211 if (hlen > MCLBYTES) 1212 return (ENOBUFS); /* XXX */ 1213 1214 MGET(m, M_DONTWAIT, MT_DATA); 1215 if (!m) 1216 return (ENOBUFS); 1217 1218 if (hlen > MLEN) { 1219 MCLGET(m, M_DONTWAIT); 1220 if ((m->m_flags & M_EXT) == 0) { 1221 m_free(m); 1222 return (ENOBUFS); 1223 } 1224 } 1225 m->m_len = hlen; 1226 if (hdr) 1227 bcopy(hdr, mtod(m, void *), hlen); 1228 1229 *mp = m; 1230 return (0); 1231 } 1232 1233 /* 1234 * Process a delayed payload checksum calculation. 1235 */ 1236 void 1237 in6_delayed_cksum(struct mbuf *m) 1238 { 1239 uint16_t csum, offset; 1240 1241 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1242 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1243 KASSERT((m->m_pkthdr.csum_flags 1244 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1245 1246 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1247 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1248 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1249 csum = 0xffff; 1250 } 1251 1252 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1253 if ((offset + sizeof(csum)) > m->m_len) { 1254 m_copyback(m, offset, sizeof(csum), &csum); 1255 } else { 1256 *(uint16_t *)(mtod(m, char *) + offset) = csum; 1257 } 1258 } 1259 1260 /* 1261 * Insert jumbo payload option. 1262 */ 1263 static int 1264 ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) 1265 { 1266 struct mbuf *mopt; 1267 u_int8_t *optbuf; 1268 u_int32_t v; 1269 1270 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1271 1272 /* 1273 * If there is no hop-by-hop options header, allocate new one. 1274 * If there is one but it doesn't have enough space to store the 1275 * jumbo payload option, allocate a cluster to store the whole options. 1276 * Otherwise, use it to store the options. 1277 */ 1278 if (exthdrs->ip6e_hbh == 0) { 1279 MGET(mopt, M_DONTWAIT, MT_DATA); 1280 if (mopt == 0) 1281 return (ENOBUFS); 1282 mopt->m_len = JUMBOOPTLEN; 1283 optbuf = mtod(mopt, u_int8_t *); 1284 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1285 exthdrs->ip6e_hbh = mopt; 1286 } else { 1287 struct ip6_hbh *hbh; 1288 1289 mopt = exthdrs->ip6e_hbh; 1290 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1291 /* 1292 * XXX assumption: 1293 * - exthdrs->ip6e_hbh is not referenced from places 1294 * other than exthdrs. 1295 * - exthdrs->ip6e_hbh is not an mbuf chain. 1296 */ 1297 int oldoptlen = mopt->m_len; 1298 struct mbuf *n; 1299 1300 /* 1301 * XXX: give up if the whole (new) hbh header does 1302 * not fit even in an mbuf cluster. 1303 */ 1304 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1305 return (ENOBUFS); 1306 1307 /* 1308 * As a consequence, we must always prepare a cluster 1309 * at this point. 1310 */ 1311 MGET(n, M_DONTWAIT, MT_DATA); 1312 if (n) { 1313 MCLGET(n, M_DONTWAIT); 1314 if ((n->m_flags & M_EXT) == 0) { 1315 m_freem(n); 1316 n = NULL; 1317 } 1318 } 1319 if (!n) 1320 return (ENOBUFS); 1321 n->m_len = oldoptlen + JUMBOOPTLEN; 1322 bcopy(mtod(mopt, void *), mtod(n, void *), 1323 oldoptlen); 1324 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1325 m_freem(mopt); 1326 mopt = exthdrs->ip6e_hbh = n; 1327 } else { 1328 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1329 mopt->m_len += JUMBOOPTLEN; 1330 } 1331 optbuf[0] = IP6OPT_PADN; 1332 optbuf[1] = 0; 1333 1334 /* 1335 * Adjust the header length according to the pad and 1336 * the jumbo payload option. 1337 */ 1338 hbh = mtod(mopt, struct ip6_hbh *); 1339 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1340 } 1341 1342 /* fill in the option. */ 1343 optbuf[2] = IP6OPT_JUMBO; 1344 optbuf[3] = 4; 1345 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1346 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1347 1348 /* finally, adjust the packet header length */ 1349 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1350 1351 return (0); 1352 #undef JUMBOOPTLEN 1353 } 1354 1355 /* 1356 * Insert fragment header and copy unfragmentable header portions. 1357 */ 1358 static int 1359 ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, 1360 struct ip6_frag **frghdrp) 1361 { 1362 struct mbuf *n, *mlast; 1363 1364 if (hlen > sizeof(struct ip6_hdr)) { 1365 n = m_copym(m0, sizeof(struct ip6_hdr), 1366 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1367 if (n == 0) 1368 return (ENOBUFS); 1369 m->m_next = n; 1370 } else 1371 n = m; 1372 1373 /* Search for the last mbuf of unfragmentable part. */ 1374 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1375 ; 1376 1377 if ((mlast->m_flags & M_EXT) == 0 && 1378 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1379 /* use the trailing space of the last mbuf for the fragment hdr */ 1380 *frghdrp = (struct ip6_frag *)(mtod(mlast, char *) + 1381 mlast->m_len); 1382 mlast->m_len += sizeof(struct ip6_frag); 1383 m->m_pkthdr.len += sizeof(struct ip6_frag); 1384 } else { 1385 /* allocate a new mbuf for the fragment header */ 1386 struct mbuf *mfrg; 1387 1388 MGET(mfrg, M_DONTWAIT, MT_DATA); 1389 if (mfrg == 0) 1390 return (ENOBUFS); 1391 mfrg->m_len = sizeof(struct ip6_frag); 1392 *frghdrp = mtod(mfrg, struct ip6_frag *); 1393 mlast->m_next = mfrg; 1394 } 1395 1396 return (0); 1397 } 1398 1399 static int 1400 ip6_getpmtu(struct route *ro_pmtu, struct route *ro, struct ifnet *ifp, 1401 const struct in6_addr *dst, u_long *mtup, int *alwaysfragp) 1402 { 1403 struct rtentry *rt; 1404 u_int32_t mtu = 0; 1405 int alwaysfrag = 0; 1406 int error = 0; 1407 1408 if (ro_pmtu != ro) { 1409 union { 1410 struct sockaddr dst; 1411 struct sockaddr_in6 dst6; 1412 } u; 1413 1414 /* The first hop and the final destination may differ. */ 1415 sockaddr_in6_init(&u.dst6, dst, 0, 0, 0); 1416 rt = rtcache_lookup(ro_pmtu, &u.dst); 1417 } else 1418 rt = rtcache_validate(ro_pmtu); 1419 if (rt != NULL) { 1420 u_int32_t ifmtu; 1421 1422 if (ifp == NULL) 1423 ifp = rt->rt_ifp; 1424 ifmtu = IN6_LINKMTU(ifp); 1425 mtu = rt->rt_rmx.rmx_mtu; 1426 if (mtu == 0) 1427 mtu = ifmtu; 1428 else if (mtu < IPV6_MMTU) { 1429 /* 1430 * RFC2460 section 5, last paragraph: 1431 * if we record ICMPv6 too big message with 1432 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1433 * or smaller, with fragment header attached. 1434 * (fragment header is needed regardless from the 1435 * packet size, for translators to identify packets) 1436 */ 1437 alwaysfrag = 1; 1438 mtu = IPV6_MMTU; 1439 } else if (mtu > ifmtu) { 1440 /* 1441 * The MTU on the route is larger than the MTU on 1442 * the interface! This shouldn't happen, unless the 1443 * MTU of the interface has been changed after the 1444 * interface was brought up. Change the MTU in the 1445 * route to match the interface MTU (as long as the 1446 * field isn't locked). 1447 */ 1448 mtu = ifmtu; 1449 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 1450 rt->rt_rmx.rmx_mtu = mtu; 1451 } 1452 } else if (ifp) { 1453 mtu = IN6_LINKMTU(ifp); 1454 } else 1455 error = EHOSTUNREACH; /* XXX */ 1456 1457 *mtup = mtu; 1458 if (alwaysfragp) 1459 *alwaysfragp = alwaysfrag; 1460 return (error); 1461 } 1462 1463 /* 1464 * IP6 socket option processing. 1465 */ 1466 int 1467 ip6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1468 { 1469 int privileged, optdatalen, uproto; 1470 void *optdata; 1471 struct in6pcb *in6p = sotoin6pcb(so); 1472 int error, optval; 1473 struct lwp *l = curlwp; /* XXX */ 1474 int level, optname; 1475 1476 KASSERT(sopt != NULL); 1477 1478 level = sopt->sopt_level; 1479 optname = sopt->sopt_name; 1480 1481 error = optval = 0; 1482 privileged = (l == 0 || kauth_authorize_generic(l->l_cred, 1483 KAUTH_GENERIC_ISSUSER, NULL)) ? 0 : 1; 1484 uproto = (int)so->so_proto->pr_protocol; 1485 1486 if (level != IPPROTO_IPV6) { 1487 return ENOPROTOOPT; 1488 } 1489 switch (op) { 1490 case PRCO_SETOPT: 1491 switch (optname) { 1492 #ifdef RFC2292 1493 case IPV6_2292PKTOPTIONS: 1494 error = ip6_pcbopts(&in6p->in6p_outputopts, so, sopt); 1495 break; 1496 #endif 1497 1498 /* 1499 * Use of some Hop-by-Hop options or some 1500 * Destination options, might require special 1501 * privilege. That is, normal applications 1502 * (without special privilege) might be forbidden 1503 * from setting certain options in outgoing packets, 1504 * and might never see certain options in received 1505 * packets. [RFC 2292 Section 6] 1506 * KAME specific note: 1507 * KAME prevents non-privileged users from sending or 1508 * receiving ANY hbh/dst options in order to avoid 1509 * overhead of parsing options in the kernel. 1510 */ 1511 case IPV6_RECVHOPOPTS: 1512 case IPV6_RECVDSTOPTS: 1513 case IPV6_RECVRTHDRDSTOPTS: 1514 if (!privileged) { 1515 error = EPERM; 1516 break; 1517 } 1518 /* FALLTHROUGH */ 1519 case IPV6_UNICAST_HOPS: 1520 case IPV6_HOPLIMIT: 1521 case IPV6_FAITH: 1522 1523 case IPV6_RECVPKTINFO: 1524 case IPV6_RECVHOPLIMIT: 1525 case IPV6_RECVRTHDR: 1526 case IPV6_RECVPATHMTU: 1527 case IPV6_RECVTCLASS: 1528 case IPV6_V6ONLY: 1529 error = sockopt_getint(sopt, &optval); 1530 if (error) 1531 break; 1532 switch (optname) { 1533 case IPV6_UNICAST_HOPS: 1534 if (optval < -1 || optval >= 256) 1535 error = EINVAL; 1536 else { 1537 /* -1 = kernel default */ 1538 in6p->in6p_hops = optval; 1539 } 1540 break; 1541 #define OPTSET(bit) \ 1542 do { \ 1543 if (optval) \ 1544 in6p->in6p_flags |= (bit); \ 1545 else \ 1546 in6p->in6p_flags &= ~(bit); \ 1547 } while (/*CONSTCOND*/ 0) 1548 1549 #ifdef RFC2292 1550 #define OPTSET2292(bit) \ 1551 do { \ 1552 in6p->in6p_flags |= IN6P_RFC2292; \ 1553 if (optval) \ 1554 in6p->in6p_flags |= (bit); \ 1555 else \ 1556 in6p->in6p_flags &= ~(bit); \ 1557 } while (/*CONSTCOND*/ 0) 1558 #endif 1559 1560 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1561 1562 case IPV6_RECVPKTINFO: 1563 #ifdef RFC2292 1564 /* cannot mix with RFC2292 */ 1565 if (OPTBIT(IN6P_RFC2292)) { 1566 error = EINVAL; 1567 break; 1568 } 1569 #endif 1570 OPTSET(IN6P_PKTINFO); 1571 break; 1572 1573 case IPV6_HOPLIMIT: 1574 { 1575 struct ip6_pktopts **optp; 1576 1577 #ifdef RFC2292 1578 /* cannot mix with RFC2292 */ 1579 if (OPTBIT(IN6P_RFC2292)) { 1580 error = EINVAL; 1581 break; 1582 } 1583 #endif 1584 optp = &in6p->in6p_outputopts; 1585 error = ip6_pcbopt(IPV6_HOPLIMIT, 1586 (u_char *)&optval, 1587 sizeof(optval), 1588 optp, 1589 privileged, uproto); 1590 break; 1591 } 1592 1593 case IPV6_RECVHOPLIMIT: 1594 #ifdef RFC2292 1595 /* cannot mix with RFC2292 */ 1596 if (OPTBIT(IN6P_RFC2292)) { 1597 error = EINVAL; 1598 break; 1599 } 1600 #endif 1601 OPTSET(IN6P_HOPLIMIT); 1602 break; 1603 1604 case IPV6_RECVHOPOPTS: 1605 #ifdef RFC2292 1606 /* cannot mix with RFC2292 */ 1607 if (OPTBIT(IN6P_RFC2292)) { 1608 error = EINVAL; 1609 break; 1610 } 1611 #endif 1612 OPTSET(IN6P_HOPOPTS); 1613 break; 1614 1615 case IPV6_RECVDSTOPTS: 1616 #ifdef RFC2292 1617 /* cannot mix with RFC2292 */ 1618 if (OPTBIT(IN6P_RFC2292)) { 1619 error = EINVAL; 1620 break; 1621 } 1622 #endif 1623 OPTSET(IN6P_DSTOPTS); 1624 break; 1625 1626 case IPV6_RECVRTHDRDSTOPTS: 1627 #ifdef RFC2292 1628 /* cannot mix with RFC2292 */ 1629 if (OPTBIT(IN6P_RFC2292)) { 1630 error = EINVAL; 1631 break; 1632 } 1633 #endif 1634 OPTSET(IN6P_RTHDRDSTOPTS); 1635 break; 1636 1637 case IPV6_RECVRTHDR: 1638 #ifdef RFC2292 1639 /* cannot mix with RFC2292 */ 1640 if (OPTBIT(IN6P_RFC2292)) { 1641 error = EINVAL; 1642 break; 1643 } 1644 #endif 1645 OPTSET(IN6P_RTHDR); 1646 break; 1647 1648 case IPV6_FAITH: 1649 OPTSET(IN6P_FAITH); 1650 break; 1651 1652 case IPV6_RECVPATHMTU: 1653 /* 1654 * We ignore this option for TCP 1655 * sockets. 1656 * (RFC3542 leaves this case 1657 * unspecified.) 1658 */ 1659 if (uproto != IPPROTO_TCP) 1660 OPTSET(IN6P_MTU); 1661 break; 1662 1663 case IPV6_V6ONLY: 1664 /* 1665 * make setsockopt(IPV6_V6ONLY) 1666 * available only prior to bind(2). 1667 * see ipng mailing list, Jun 22 2001. 1668 */ 1669 if (in6p->in6p_lport || 1670 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1671 error = EINVAL; 1672 break; 1673 } 1674 #ifdef INET6_BINDV6ONLY 1675 if (!optval) 1676 error = EINVAL; 1677 #else 1678 OPTSET(IN6P_IPV6_V6ONLY); 1679 #endif 1680 break; 1681 case IPV6_RECVTCLASS: 1682 #ifdef RFC2292 1683 /* cannot mix with RFC2292 XXX */ 1684 if (OPTBIT(IN6P_RFC2292)) { 1685 error = EINVAL; 1686 break; 1687 } 1688 #endif 1689 OPTSET(IN6P_TCLASS); 1690 break; 1691 1692 } 1693 break; 1694 1695 case IPV6_OTCLASS: 1696 { 1697 struct ip6_pktopts **optp; 1698 u_int8_t tclass; 1699 1700 error = sockopt_get(sopt, &tclass, sizeof(tclass)); 1701 if (error) 1702 break; 1703 optp = &in6p->in6p_outputopts; 1704 error = ip6_pcbopt(optname, 1705 (u_char *)&tclass, 1706 sizeof(tclass), 1707 optp, 1708 privileged, uproto); 1709 break; 1710 } 1711 1712 case IPV6_TCLASS: 1713 case IPV6_DONTFRAG: 1714 case IPV6_USE_MIN_MTU: 1715 error = sockopt_getint(sopt, &optval); 1716 if (error) 1717 break; 1718 { 1719 struct ip6_pktopts **optp; 1720 optp = &in6p->in6p_outputopts; 1721 error = ip6_pcbopt(optname, 1722 (u_char *)&optval, 1723 sizeof(optval), 1724 optp, 1725 privileged, uproto); 1726 break; 1727 } 1728 1729 #ifdef RFC2292 1730 case IPV6_2292PKTINFO: 1731 case IPV6_2292HOPLIMIT: 1732 case IPV6_2292HOPOPTS: 1733 case IPV6_2292DSTOPTS: 1734 case IPV6_2292RTHDR: 1735 /* RFC 2292 */ 1736 error = sockopt_getint(sopt, &optval); 1737 if (error) 1738 break; 1739 1740 switch (optname) { 1741 case IPV6_2292PKTINFO: 1742 OPTSET2292(IN6P_PKTINFO); 1743 break; 1744 case IPV6_2292HOPLIMIT: 1745 OPTSET2292(IN6P_HOPLIMIT); 1746 break; 1747 case IPV6_2292HOPOPTS: 1748 /* 1749 * Check super-user privilege. 1750 * See comments for IPV6_RECVHOPOPTS. 1751 */ 1752 if (!privileged) 1753 return (EPERM); 1754 OPTSET2292(IN6P_HOPOPTS); 1755 break; 1756 case IPV6_2292DSTOPTS: 1757 if (!privileged) 1758 return (EPERM); 1759 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1760 break; 1761 case IPV6_2292RTHDR: 1762 OPTSET2292(IN6P_RTHDR); 1763 break; 1764 } 1765 break; 1766 #endif 1767 case IPV6_PKTINFO: 1768 case IPV6_HOPOPTS: 1769 case IPV6_RTHDR: 1770 case IPV6_DSTOPTS: 1771 case IPV6_RTHDRDSTOPTS: 1772 case IPV6_NEXTHOP: { 1773 /* new advanced API (RFC3542) */ 1774 void *optbuf; 1775 int optbuflen; 1776 struct ip6_pktopts **optp; 1777 1778 #ifdef RFC2292 1779 /* cannot mix with RFC2292 */ 1780 if (OPTBIT(IN6P_RFC2292)) { 1781 error = EINVAL; 1782 break; 1783 } 1784 #endif 1785 1786 optbuflen = sopt->sopt_size; 1787 optbuf = malloc(optbuflen, M_IP6OPT, M_NOWAIT); 1788 if (optbuf == NULL) { 1789 error = ENOBUFS; 1790 break; 1791 } 1792 1793 sockopt_get(sopt, optbuf, optbuflen); 1794 optp = &in6p->in6p_outputopts; 1795 error = ip6_pcbopt(optname, optbuf, optbuflen, 1796 optp, privileged, uproto); 1797 1798 free(optbuf, M_IP6OPT); 1799 break; 1800 } 1801 #undef OPTSET 1802 1803 case IPV6_MULTICAST_IF: 1804 case IPV6_MULTICAST_HOPS: 1805 case IPV6_MULTICAST_LOOP: 1806 case IPV6_JOIN_GROUP: 1807 case IPV6_LEAVE_GROUP: 1808 error = ip6_setmoptions(sopt, &in6p->in6p_moptions); 1809 break; 1810 1811 case IPV6_PORTRANGE: 1812 error = sockopt_getint(sopt, &optval); 1813 if (error) 1814 break; 1815 1816 switch (optval) { 1817 case IPV6_PORTRANGE_DEFAULT: 1818 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1819 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1820 break; 1821 1822 case IPV6_PORTRANGE_HIGH: 1823 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1824 in6p->in6p_flags |= IN6P_HIGHPORT; 1825 break; 1826 1827 case IPV6_PORTRANGE_LOW: 1828 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1829 in6p->in6p_flags |= IN6P_LOWPORT; 1830 break; 1831 1832 default: 1833 error = EINVAL; 1834 break; 1835 } 1836 break; 1837 1838 1839 #if defined(IPSEC) || defined(FAST_IPSEC) 1840 case IPV6_IPSEC_POLICY: 1841 error = ipsec6_set_policy(in6p, optname, 1842 sopt->sopt_data, sopt->sopt_size, privileged); 1843 break; 1844 #endif /* IPSEC */ 1845 1846 default: 1847 error = ENOPROTOOPT; 1848 break; 1849 } 1850 break; 1851 1852 case PRCO_GETOPT: 1853 switch (optname) { 1854 #ifdef RFC2292 1855 case IPV6_2292PKTOPTIONS: 1856 /* 1857 * RFC3542 (effectively) deprecated the 1858 * semantics of the 2292-style pktoptions. 1859 * Since it was not reliable in nature (i.e., 1860 * applications had to expect the lack of some 1861 * information after all), it would make sense 1862 * to simplify this part by always returning 1863 * empty data. 1864 */ 1865 break; 1866 #endif 1867 1868 case IPV6_RECVHOPOPTS: 1869 case IPV6_RECVDSTOPTS: 1870 case IPV6_RECVRTHDRDSTOPTS: 1871 case IPV6_UNICAST_HOPS: 1872 case IPV6_RECVPKTINFO: 1873 case IPV6_RECVHOPLIMIT: 1874 case IPV6_RECVRTHDR: 1875 case IPV6_RECVPATHMTU: 1876 1877 case IPV6_FAITH: 1878 case IPV6_V6ONLY: 1879 case IPV6_PORTRANGE: 1880 case IPV6_RECVTCLASS: 1881 switch (optname) { 1882 1883 case IPV6_RECVHOPOPTS: 1884 optval = OPTBIT(IN6P_HOPOPTS); 1885 break; 1886 1887 case IPV6_RECVDSTOPTS: 1888 optval = OPTBIT(IN6P_DSTOPTS); 1889 break; 1890 1891 case IPV6_RECVRTHDRDSTOPTS: 1892 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1893 break; 1894 1895 case IPV6_UNICAST_HOPS: 1896 optval = in6p->in6p_hops; 1897 break; 1898 1899 case IPV6_RECVPKTINFO: 1900 optval = OPTBIT(IN6P_PKTINFO); 1901 break; 1902 1903 case IPV6_RECVHOPLIMIT: 1904 optval = OPTBIT(IN6P_HOPLIMIT); 1905 break; 1906 1907 case IPV6_RECVRTHDR: 1908 optval = OPTBIT(IN6P_RTHDR); 1909 break; 1910 1911 case IPV6_RECVPATHMTU: 1912 optval = OPTBIT(IN6P_MTU); 1913 break; 1914 1915 case IPV6_FAITH: 1916 optval = OPTBIT(IN6P_FAITH); 1917 break; 1918 1919 case IPV6_V6ONLY: 1920 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1921 break; 1922 1923 case IPV6_PORTRANGE: 1924 { 1925 int flags; 1926 flags = in6p->in6p_flags; 1927 if (flags & IN6P_HIGHPORT) 1928 optval = IPV6_PORTRANGE_HIGH; 1929 else if (flags & IN6P_LOWPORT) 1930 optval = IPV6_PORTRANGE_LOW; 1931 else 1932 optval = 0; 1933 break; 1934 } 1935 case IPV6_RECVTCLASS: 1936 optval = OPTBIT(IN6P_TCLASS); 1937 break; 1938 1939 } 1940 if (error) 1941 break; 1942 error = sockopt_setint(sopt, optval); 1943 break; 1944 1945 case IPV6_PATHMTU: 1946 { 1947 u_long pmtu = 0; 1948 struct ip6_mtuinfo mtuinfo; 1949 struct route *ro = &in6p->in6p_route; 1950 1951 if (!(so->so_state & SS_ISCONNECTED)) 1952 return (ENOTCONN); 1953 /* 1954 * XXX: we dot not consider the case of source 1955 * routing, or optional information to specify 1956 * the outgoing interface. 1957 */ 1958 error = ip6_getpmtu(ro, NULL, NULL, 1959 &in6p->in6p_faddr, &pmtu, NULL); 1960 if (error) 1961 break; 1962 if (pmtu > IPV6_MAXPACKET) 1963 pmtu = IPV6_MAXPACKET; 1964 1965 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1966 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1967 optdata = (void *)&mtuinfo; 1968 optdatalen = sizeof(mtuinfo); 1969 if (optdatalen > MCLBYTES) 1970 return (EMSGSIZE); /* XXX */ 1971 error = sockopt_set(sopt, optdata, optdatalen); 1972 break; 1973 } 1974 1975 #ifdef RFC2292 1976 case IPV6_2292PKTINFO: 1977 case IPV6_2292HOPLIMIT: 1978 case IPV6_2292HOPOPTS: 1979 case IPV6_2292RTHDR: 1980 case IPV6_2292DSTOPTS: 1981 switch (optname) { 1982 case IPV6_2292PKTINFO: 1983 optval = OPTBIT(IN6P_PKTINFO); 1984 break; 1985 case IPV6_2292HOPLIMIT: 1986 optval = OPTBIT(IN6P_HOPLIMIT); 1987 break; 1988 case IPV6_2292HOPOPTS: 1989 optval = OPTBIT(IN6P_HOPOPTS); 1990 break; 1991 case IPV6_2292RTHDR: 1992 optval = OPTBIT(IN6P_RTHDR); 1993 break; 1994 case IPV6_2292DSTOPTS: 1995 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1996 break; 1997 } 1998 error = sockopt_setint(sopt, optval); 1999 break; 2000 #endif 2001 case IPV6_PKTINFO: 2002 case IPV6_HOPOPTS: 2003 case IPV6_RTHDR: 2004 case IPV6_DSTOPTS: 2005 case IPV6_RTHDRDSTOPTS: 2006 case IPV6_NEXTHOP: 2007 case IPV6_OTCLASS: 2008 case IPV6_TCLASS: 2009 case IPV6_DONTFRAG: 2010 case IPV6_USE_MIN_MTU: 2011 error = ip6_getpcbopt(in6p->in6p_outputopts, 2012 optname, sopt); 2013 break; 2014 2015 case IPV6_MULTICAST_IF: 2016 case IPV6_MULTICAST_HOPS: 2017 case IPV6_MULTICAST_LOOP: 2018 case IPV6_JOIN_GROUP: 2019 case IPV6_LEAVE_GROUP: 2020 error = ip6_getmoptions(sopt, in6p->in6p_moptions); 2021 break; 2022 2023 #if defined(IPSEC) || defined(FAST_IPSEC) 2024 case IPV6_IPSEC_POLICY: 2025 { 2026 struct mbuf *m = NULL; 2027 2028 /* XXX this will return EINVAL as sopt is empty */ 2029 error = ipsec6_get_policy(in6p, sopt->sopt_data, 2030 sopt->sopt_size, &m); 2031 if (!error) 2032 error = sockopt_setmbuf(sopt, m); 2033 2034 break; 2035 } 2036 #endif /* IPSEC */ 2037 2038 default: 2039 error = ENOPROTOOPT; 2040 break; 2041 } 2042 break; 2043 } 2044 return (error); 2045 } 2046 2047 int 2048 ip6_raw_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2049 { 2050 int error = 0, optval; 2051 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2052 struct in6pcb *in6p = sotoin6pcb(so); 2053 int level, optname; 2054 2055 KASSERT(sopt != NULL); 2056 2057 level = sopt->sopt_level; 2058 optname = sopt->sopt_name; 2059 2060 if (level != IPPROTO_IPV6) { 2061 return ENOPROTOOPT; 2062 } 2063 2064 switch (optname) { 2065 case IPV6_CHECKSUM: 2066 /* 2067 * For ICMPv6 sockets, no modification allowed for checksum 2068 * offset, permit "no change" values to help existing apps. 2069 * 2070 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 2071 * for an ICMPv6 socket will fail." The current 2072 * behavior does not meet RFC3542. 2073 */ 2074 switch (op) { 2075 case PRCO_SETOPT: 2076 error = sockopt_getint(sopt, &optval); 2077 if (error) 2078 break; 2079 if ((optval % 2) != 0) { 2080 /* the API assumes even offset values */ 2081 error = EINVAL; 2082 } else if (so->so_proto->pr_protocol == 2083 IPPROTO_ICMPV6) { 2084 if (optval != icmp6off) 2085 error = EINVAL; 2086 } else 2087 in6p->in6p_cksum = optval; 2088 break; 2089 2090 case PRCO_GETOPT: 2091 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2092 optval = icmp6off; 2093 else 2094 optval = in6p->in6p_cksum; 2095 2096 error = sockopt_setint(sopt, optval); 2097 break; 2098 2099 default: 2100 error = EINVAL; 2101 break; 2102 } 2103 break; 2104 2105 default: 2106 error = ENOPROTOOPT; 2107 break; 2108 } 2109 2110 return (error); 2111 } 2112 2113 #ifdef RFC2292 2114 /* 2115 * Set up IP6 options in pcb for insertion in output packets or 2116 * specifying behavior of outgoing packets. 2117 */ 2118 static int 2119 ip6_pcbopts(struct ip6_pktopts **pktopt, struct socket *so, 2120 struct sockopt *sopt) 2121 { 2122 struct ip6_pktopts *opt = *pktopt; 2123 struct mbuf *m; 2124 int error = 0; 2125 struct lwp *l = curlwp; /* XXX */ 2126 int priv = 0; 2127 2128 /* turn off any old options. */ 2129 if (opt) { 2130 #ifdef DIAGNOSTIC 2131 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2132 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2133 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2134 printf("ip6_pcbopts: all specified options are cleared.\n"); 2135 #endif 2136 ip6_clearpktopts(opt, -1); 2137 } else { 2138 opt = malloc(sizeof(*opt), M_IP6OPT, M_NOWAIT); 2139 if (opt == NULL) 2140 return (ENOBUFS); 2141 } 2142 *pktopt = NULL; 2143 2144 if (sopt == NULL || sopt->sopt_size == 0) { 2145 /* 2146 * Only turning off any previous options, regardless of 2147 * whether the opt is just created or given. 2148 */ 2149 free(opt, M_IP6OPT); 2150 return (0); 2151 } 2152 2153 /* set options specified by user. */ 2154 if (l && !kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 2155 NULL)) 2156 priv = 1; 2157 2158 m = sockopt_getmbuf(sopt); 2159 if (m == NULL) { 2160 free(opt, M_IP6OPT); 2161 return (ENOBUFS); 2162 } 2163 2164 error = ip6_setpktopts(m, opt, NULL, priv, so->so_proto->pr_protocol); 2165 m_freem(m); 2166 if (error != 0) { 2167 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2168 free(opt, M_IP6OPT); 2169 return (error); 2170 } 2171 *pktopt = opt; 2172 return (0); 2173 } 2174 #endif 2175 2176 /* 2177 * initialize ip6_pktopts. beware that there are non-zero default values in 2178 * the struct. 2179 */ 2180 void 2181 ip6_initpktopts(struct ip6_pktopts *opt) 2182 { 2183 2184 memset(opt, 0, sizeof(*opt)); 2185 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2186 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2187 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2188 } 2189 2190 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2191 static int 2192 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2193 int priv, int uproto) 2194 { 2195 struct ip6_pktopts *opt; 2196 2197 if (*pktopt == NULL) { 2198 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2199 M_NOWAIT); 2200 if (*pktopt == NULL) 2201 return (ENOBUFS); 2202 2203 ip6_initpktopts(*pktopt); 2204 } 2205 opt = *pktopt; 2206 2207 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2208 } 2209 2210 static int 2211 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) 2212 { 2213 void *optdata = NULL; 2214 int optdatalen = 0; 2215 struct ip6_ext *ip6e; 2216 int error = 0; 2217 struct in6_pktinfo null_pktinfo; 2218 int deftclass = 0, on; 2219 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2220 2221 switch (optname) { 2222 case IPV6_PKTINFO: 2223 if (pktopt && pktopt->ip6po_pktinfo) 2224 optdata = (void *)pktopt->ip6po_pktinfo; 2225 else { 2226 /* XXX: we don't have to do this every time... */ 2227 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2228 optdata = (void *)&null_pktinfo; 2229 } 2230 optdatalen = sizeof(struct in6_pktinfo); 2231 break; 2232 case IPV6_OTCLASS: 2233 /* XXX */ 2234 return (EINVAL); 2235 case IPV6_TCLASS: 2236 if (pktopt && pktopt->ip6po_tclass >= 0) 2237 optdata = (void *)&pktopt->ip6po_tclass; 2238 else 2239 optdata = (void *)&deftclass; 2240 optdatalen = sizeof(int); 2241 break; 2242 case IPV6_HOPOPTS: 2243 if (pktopt && pktopt->ip6po_hbh) { 2244 optdata = (void *)pktopt->ip6po_hbh; 2245 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2246 optdatalen = (ip6e->ip6e_len + 1) << 3; 2247 } 2248 break; 2249 case IPV6_RTHDR: 2250 if (pktopt && pktopt->ip6po_rthdr) { 2251 optdata = (void *)pktopt->ip6po_rthdr; 2252 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2253 optdatalen = (ip6e->ip6e_len + 1) << 3; 2254 } 2255 break; 2256 case IPV6_RTHDRDSTOPTS: 2257 if (pktopt && pktopt->ip6po_dest1) { 2258 optdata = (void *)pktopt->ip6po_dest1; 2259 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2260 optdatalen = (ip6e->ip6e_len + 1) << 3; 2261 } 2262 break; 2263 case IPV6_DSTOPTS: 2264 if (pktopt && pktopt->ip6po_dest2) { 2265 optdata = (void *)pktopt->ip6po_dest2; 2266 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2267 optdatalen = (ip6e->ip6e_len + 1) << 3; 2268 } 2269 break; 2270 case IPV6_NEXTHOP: 2271 if (pktopt && pktopt->ip6po_nexthop) { 2272 optdata = (void *)pktopt->ip6po_nexthop; 2273 optdatalen = pktopt->ip6po_nexthop->sa_len; 2274 } 2275 break; 2276 case IPV6_USE_MIN_MTU: 2277 if (pktopt) 2278 optdata = (void *)&pktopt->ip6po_minmtu; 2279 else 2280 optdata = (void *)&defminmtu; 2281 optdatalen = sizeof(int); 2282 break; 2283 case IPV6_DONTFRAG: 2284 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2285 on = 1; 2286 else 2287 on = 0; 2288 optdata = (void *)&on; 2289 optdatalen = sizeof(on); 2290 break; 2291 default: /* should not happen */ 2292 #ifdef DIAGNOSTIC 2293 panic("ip6_getpcbopt: unexpected option\n"); 2294 #endif 2295 return (ENOPROTOOPT); 2296 } 2297 2298 error = sockopt_set(sopt, optdata, optdatalen); 2299 2300 return (error); 2301 } 2302 2303 void 2304 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2305 { 2306 if (optname == -1 || optname == IPV6_PKTINFO) { 2307 if (pktopt->ip6po_pktinfo) 2308 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2309 pktopt->ip6po_pktinfo = NULL; 2310 } 2311 if (optname == -1 || optname == IPV6_HOPLIMIT) 2312 pktopt->ip6po_hlim = -1; 2313 if (optname == -1 || optname == IPV6_TCLASS) 2314 pktopt->ip6po_tclass = -1; 2315 if (optname == -1 || optname == IPV6_NEXTHOP) { 2316 rtcache_free(&pktopt->ip6po_nextroute); 2317 if (pktopt->ip6po_nexthop) 2318 free(pktopt->ip6po_nexthop, M_IP6OPT); 2319 pktopt->ip6po_nexthop = NULL; 2320 } 2321 if (optname == -1 || optname == IPV6_HOPOPTS) { 2322 if (pktopt->ip6po_hbh) 2323 free(pktopt->ip6po_hbh, M_IP6OPT); 2324 pktopt->ip6po_hbh = NULL; 2325 } 2326 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2327 if (pktopt->ip6po_dest1) 2328 free(pktopt->ip6po_dest1, M_IP6OPT); 2329 pktopt->ip6po_dest1 = NULL; 2330 } 2331 if (optname == -1 || optname == IPV6_RTHDR) { 2332 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2333 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2334 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2335 rtcache_free(&pktopt->ip6po_route); 2336 } 2337 if (optname == -1 || optname == IPV6_DSTOPTS) { 2338 if (pktopt->ip6po_dest2) 2339 free(pktopt->ip6po_dest2, M_IP6OPT); 2340 pktopt->ip6po_dest2 = NULL; 2341 } 2342 } 2343 2344 #define PKTOPT_EXTHDRCPY(type) \ 2345 do { \ 2346 if (src->type) { \ 2347 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2348 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2349 if (dst->type == NULL && canwait == M_NOWAIT) \ 2350 goto bad; \ 2351 memcpy(dst->type, src->type, hlen); \ 2352 } \ 2353 } while (/*CONSTCOND*/ 0) 2354 2355 static int 2356 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2357 { 2358 dst->ip6po_hlim = src->ip6po_hlim; 2359 dst->ip6po_tclass = src->ip6po_tclass; 2360 dst->ip6po_flags = src->ip6po_flags; 2361 if (src->ip6po_pktinfo) { 2362 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2363 M_IP6OPT, canwait); 2364 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2365 goto bad; 2366 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2367 } 2368 if (src->ip6po_nexthop) { 2369 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2370 M_IP6OPT, canwait); 2371 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 2372 goto bad; 2373 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2374 src->ip6po_nexthop->sa_len); 2375 } 2376 PKTOPT_EXTHDRCPY(ip6po_hbh); 2377 PKTOPT_EXTHDRCPY(ip6po_dest1); 2378 PKTOPT_EXTHDRCPY(ip6po_dest2); 2379 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2380 return (0); 2381 2382 bad: 2383 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2384 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2385 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2386 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2387 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2388 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2389 2390 return (ENOBUFS); 2391 } 2392 #undef PKTOPT_EXTHDRCPY 2393 2394 struct ip6_pktopts * 2395 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2396 { 2397 int error; 2398 struct ip6_pktopts *dst; 2399 2400 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2401 if (dst == NULL && canwait == M_NOWAIT) 2402 return (NULL); 2403 ip6_initpktopts(dst); 2404 2405 if ((error = copypktopts(dst, src, canwait)) != 0) { 2406 free(dst, M_IP6OPT); 2407 return (NULL); 2408 } 2409 2410 return (dst); 2411 } 2412 2413 void 2414 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2415 { 2416 if (pktopt == NULL) 2417 return; 2418 2419 ip6_clearpktopts(pktopt, -1); 2420 2421 free(pktopt, M_IP6OPT); 2422 } 2423 2424 /* 2425 * Set the IP6 multicast options in response to user setsockopt(). 2426 */ 2427 static int 2428 ip6_setmoptions(const struct sockopt *sopt, struct ip6_moptions **im6op) 2429 { 2430 int error = 0; 2431 u_int loop, ifindex; 2432 struct ipv6_mreq mreq; 2433 struct ifnet *ifp; 2434 struct ip6_moptions *im6o = *im6op; 2435 struct route ro; 2436 struct in6_multi_mship *imm; 2437 struct lwp *l = curlwp; /* XXX */ 2438 2439 if (im6o == NULL) { 2440 /* 2441 * No multicast option buffer attached to the pcb; 2442 * allocate one and initialize to default values. 2443 */ 2444 im6o = malloc(sizeof(*im6o), M_IPMOPTS, M_NOWAIT); 2445 if (im6o == NULL) 2446 return (ENOBUFS); 2447 2448 *im6op = im6o; 2449 im6o->im6o_multicast_ifp = NULL; 2450 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2451 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2452 LIST_INIT(&im6o->im6o_memberships); 2453 } 2454 2455 switch (sopt->sopt_name) { 2456 2457 case IPV6_MULTICAST_IF: 2458 /* 2459 * Select the interface for outgoing multicast packets. 2460 */ 2461 error = sockopt_get(sopt, &ifindex, sizeof(ifindex)); 2462 if (error != 0) 2463 break; 2464 2465 if (ifindex != 0) { 2466 if (if_indexlim <= ifindex || !ifindex2ifnet[ifindex]) { 2467 error = ENXIO; /* XXX EINVAL? */ 2468 break; 2469 } 2470 ifp = ifindex2ifnet[ifindex]; 2471 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2472 error = EADDRNOTAVAIL; 2473 break; 2474 } 2475 } else 2476 ifp = NULL; 2477 im6o->im6o_multicast_ifp = ifp; 2478 break; 2479 2480 case IPV6_MULTICAST_HOPS: 2481 { 2482 /* 2483 * Set the IP6 hoplimit for outgoing multicast packets. 2484 */ 2485 int optval; 2486 2487 error = sockopt_getint(sopt, &optval); 2488 if (error != 0) 2489 break; 2490 2491 if (optval < -1 || optval >= 256) 2492 error = EINVAL; 2493 else if (optval == -1) 2494 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2495 else 2496 im6o->im6o_multicast_hlim = optval; 2497 break; 2498 } 2499 2500 case IPV6_MULTICAST_LOOP: 2501 /* 2502 * Set the loopback flag for outgoing multicast packets. 2503 * Must be zero or one. 2504 */ 2505 error = sockopt_get(sopt, &loop, sizeof(loop)); 2506 if (error != 0) 2507 break; 2508 if (loop > 1) { 2509 error = EINVAL; 2510 break; 2511 } 2512 im6o->im6o_multicast_loop = loop; 2513 break; 2514 2515 case IPV6_JOIN_GROUP: 2516 /* 2517 * Add a multicast group membership. 2518 * Group must be a valid IP6 multicast address. 2519 */ 2520 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2521 if (error != 0) 2522 break; 2523 2524 if (IN6_IS_ADDR_UNSPECIFIED(&mreq.ipv6mr_multiaddr)) { 2525 /* 2526 * We use the unspecified address to specify to accept 2527 * all multicast addresses. Only super user is allowed 2528 * to do this. 2529 */ 2530 if (kauth_authorize_generic(l->l_cred, 2531 KAUTH_GENERIC_ISSUSER, NULL)) 2532 { 2533 error = EACCES; 2534 break; 2535 } 2536 } else if (!IN6_IS_ADDR_MULTICAST(&mreq.ipv6mr_multiaddr)) { 2537 error = EINVAL; 2538 break; 2539 } 2540 2541 /* 2542 * If no interface was explicitly specified, choose an 2543 * appropriate one according to the given multicast address. 2544 */ 2545 if (mreq.ipv6mr_interface == 0) { 2546 struct rtentry *rt; 2547 union { 2548 struct sockaddr dst; 2549 struct sockaddr_in6 dst6; 2550 } u; 2551 2552 /* 2553 * Look up the routing table for the 2554 * address, and choose the outgoing interface. 2555 * XXX: is it a good approach? 2556 */ 2557 memset(&ro, 0, sizeof(ro)); 2558 sockaddr_in6_init(&u.dst6, &mreq.ipv6mr_multiaddr, 0, 2559 0, 0); 2560 rtcache_setdst(&ro, &u.dst); 2561 ifp = (rt = rtcache_init(&ro)) != NULL ? rt->rt_ifp 2562 : NULL; 2563 rtcache_free(&ro); 2564 } else { 2565 /* 2566 * If the interface is specified, validate it. 2567 */ 2568 if (if_indexlim <= mreq.ipv6mr_interface || 2569 !ifindex2ifnet[mreq.ipv6mr_interface]) { 2570 error = ENXIO; /* XXX EINVAL? */ 2571 break; 2572 } 2573 ifp = ifindex2ifnet[mreq.ipv6mr_interface]; 2574 } 2575 2576 /* 2577 * See if we found an interface, and confirm that it 2578 * supports multicast 2579 */ 2580 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2581 error = EADDRNOTAVAIL; 2582 break; 2583 } 2584 2585 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2586 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2587 break; 2588 } 2589 2590 /* 2591 * See if the membership already exists. 2592 */ 2593 for (imm = im6o->im6o_memberships.lh_first; 2594 imm != NULL; imm = imm->i6mm_chain.le_next) 2595 if (imm->i6mm_maddr->in6m_ifp == ifp && 2596 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2597 &mreq.ipv6mr_multiaddr)) 2598 break; 2599 if (imm != NULL) { 2600 error = EADDRINUSE; 2601 break; 2602 } 2603 /* 2604 * Everything looks good; add a new record to the multicast 2605 * address list for the given interface. 2606 */ 2607 imm = in6_joingroup(ifp, &mreq.ipv6mr_multiaddr, &error, 0); 2608 if (imm == NULL) 2609 break; 2610 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2611 break; 2612 2613 case IPV6_LEAVE_GROUP: 2614 /* 2615 * Drop a multicast group membership. 2616 * Group must be a valid IP6 multicast address. 2617 */ 2618 error = sockopt_get(sopt, &mreq, sizeof(mreq)); 2619 if (error != 0) 2620 break; 2621 2622 /* 2623 * If an interface address was specified, get a pointer 2624 * to its ifnet structure. 2625 */ 2626 if (mreq.ipv6mr_interface != 0) { 2627 if (if_indexlim <= mreq.ipv6mr_interface || 2628 !ifindex2ifnet[mreq.ipv6mr_interface]) { 2629 error = ENXIO; /* XXX EINVAL? */ 2630 break; 2631 } 2632 ifp = ifindex2ifnet[mreq.ipv6mr_interface]; 2633 } else 2634 ifp = NULL; 2635 2636 /* Fill in the scope zone ID */ 2637 if (ifp) { 2638 if (in6_setscope(&mreq.ipv6mr_multiaddr, ifp, NULL)) { 2639 /* XXX: should not happen */ 2640 error = EADDRNOTAVAIL; 2641 break; 2642 } 2643 } else if (mreq.ipv6mr_interface != 0) { 2644 /* 2645 * XXX: This case would happens when the (positive) 2646 * index is in the valid range, but the corresponding 2647 * interface has been detached dynamically. The above 2648 * check probably avoids such case to happen here, but 2649 * we check it explicitly for safety. 2650 */ 2651 error = EADDRNOTAVAIL; 2652 break; 2653 } else { /* ipv6mr_interface == 0 */ 2654 struct sockaddr_in6 sa6_mc; 2655 2656 /* 2657 * The API spec says as follows: 2658 * If the interface index is specified as 0, the 2659 * system may choose a multicast group membership to 2660 * drop by matching the multicast address only. 2661 * On the other hand, we cannot disambiguate the scope 2662 * zone unless an interface is provided. Thus, we 2663 * check if there's ambiguity with the default scope 2664 * zone as the last resort. 2665 */ 2666 sockaddr_in6_init(&sa6_mc, &mreq.ipv6mr_multiaddr, 2667 0, 0, 0); 2668 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2669 if (error != 0) 2670 break; 2671 mreq.ipv6mr_multiaddr = sa6_mc.sin6_addr; 2672 } 2673 2674 /* 2675 * Find the membership in the membership list. 2676 */ 2677 for (imm = im6o->im6o_memberships.lh_first; 2678 imm != NULL; imm = imm->i6mm_chain.le_next) { 2679 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2680 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2681 &mreq.ipv6mr_multiaddr)) 2682 break; 2683 } 2684 if (imm == NULL) { 2685 /* Unable to resolve interface */ 2686 error = EADDRNOTAVAIL; 2687 break; 2688 } 2689 /* 2690 * Give up the multicast address record to which the 2691 * membership points. 2692 */ 2693 LIST_REMOVE(imm, i6mm_chain); 2694 in6_leavegroup(imm); 2695 break; 2696 2697 default: 2698 error = EOPNOTSUPP; 2699 break; 2700 } 2701 2702 /* 2703 * If all options have default values, no need to keep the mbuf. 2704 */ 2705 if (im6o->im6o_multicast_ifp == NULL && 2706 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2707 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2708 im6o->im6o_memberships.lh_first == NULL) { 2709 free(*im6op, M_IPMOPTS); 2710 *im6op = NULL; 2711 } 2712 2713 return (error); 2714 } 2715 2716 /* 2717 * Return the IP6 multicast options in response to user getsockopt(). 2718 */ 2719 static int 2720 ip6_getmoptions(struct sockopt *sopt, struct ip6_moptions *im6o) 2721 { 2722 u_int optval; 2723 int error; 2724 2725 switch (sopt->sopt_name) { 2726 case IPV6_MULTICAST_IF: 2727 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2728 optval = 0; 2729 else 2730 optval = im6o->im6o_multicast_ifp->if_index; 2731 2732 error = sockopt_set(sopt, &optval, sizeof(optval)); 2733 break; 2734 2735 case IPV6_MULTICAST_HOPS: 2736 if (im6o == NULL) 2737 optval = ip6_defmcasthlim; 2738 else 2739 optval = im6o->im6o_multicast_hlim; 2740 2741 error = sockopt_set(sopt, &optval, sizeof(optval)); 2742 break; 2743 2744 case IPV6_MULTICAST_LOOP: 2745 if (im6o == NULL) 2746 optval = ip6_defmcasthlim; 2747 else 2748 optval = im6o->im6o_multicast_loop; 2749 2750 error = sockopt_set(sopt, &optval, sizeof(optval)); 2751 break; 2752 2753 default: 2754 error = EOPNOTSUPP; 2755 } 2756 2757 return (error); 2758 } 2759 2760 /* 2761 * Discard the IP6 multicast options. 2762 */ 2763 void 2764 ip6_freemoptions(struct ip6_moptions *im6o) 2765 { 2766 struct in6_multi_mship *imm; 2767 2768 if (im6o == NULL) 2769 return; 2770 2771 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2772 LIST_REMOVE(imm, i6mm_chain); 2773 in6_leavegroup(imm); 2774 } 2775 free(im6o, M_IPMOPTS); 2776 } 2777 2778 /* 2779 * Set IPv6 outgoing packet options based on advanced API. 2780 */ 2781 int 2782 ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, 2783 struct ip6_pktopts *stickyopt, int priv, int uproto) 2784 { 2785 struct cmsghdr *cm = 0; 2786 2787 if (control == NULL || opt == NULL) 2788 return (EINVAL); 2789 2790 ip6_initpktopts(opt); 2791 if (stickyopt) { 2792 int error; 2793 2794 /* 2795 * If stickyopt is provided, make a local copy of the options 2796 * for this particular packet, then override them by ancillary 2797 * objects. 2798 * XXX: copypktopts() does not copy the cached route to a next 2799 * hop (if any). This is not very good in terms of efficiency, 2800 * but we can allow this since this option should be rarely 2801 * used. 2802 */ 2803 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2804 return (error); 2805 } 2806 2807 /* 2808 * XXX: Currently, we assume all the optional information is stored 2809 * in a single mbuf. 2810 */ 2811 if (control->m_next) 2812 return (EINVAL); 2813 2814 /* XXX if cm->cmsg_len is not aligned, control->m_len can become <0 */ 2815 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2816 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2817 int error; 2818 2819 if (control->m_len < CMSG_LEN(0)) 2820 return (EINVAL); 2821 2822 cm = mtod(control, struct cmsghdr *); 2823 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2824 return (EINVAL); 2825 if (cm->cmsg_level != IPPROTO_IPV6) 2826 continue; 2827 2828 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2829 cm->cmsg_len - CMSG_LEN(0), opt, priv, 0, 1, uproto); 2830 if (error) 2831 return (error); 2832 } 2833 2834 return (0); 2835 } 2836 2837 /* 2838 * Set a particular packet option, as a sticky option or an ancillary data 2839 * item. "len" can be 0 only when it's a sticky option. 2840 * We have 4 cases of combination of "sticky" and "cmsg": 2841 * "sticky=0, cmsg=0": impossible 2842 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 2843 * "sticky=1, cmsg=0": RFC3542 socket option 2844 * "sticky=1, cmsg=1": RFC2292 socket option 2845 */ 2846 static int 2847 ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, 2848 int priv, int sticky, int cmsg, int uproto) 2849 { 2850 int minmtupolicy; 2851 2852 if (!sticky && !cmsg) { 2853 #ifdef DIAGNOSTIC 2854 printf("ip6_setpktopt: impossible case\n"); 2855 #endif 2856 return (EINVAL); 2857 } 2858 2859 /* 2860 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 2861 * not be specified in the context of RFC3542. Conversely, 2862 * RFC3542 types should not be specified in the context of RFC2292. 2863 */ 2864 if (!cmsg) { 2865 switch (optname) { 2866 case IPV6_2292PKTINFO: 2867 case IPV6_2292HOPLIMIT: 2868 case IPV6_2292NEXTHOP: 2869 case IPV6_2292HOPOPTS: 2870 case IPV6_2292DSTOPTS: 2871 case IPV6_2292RTHDR: 2872 case IPV6_2292PKTOPTIONS: 2873 return (ENOPROTOOPT); 2874 } 2875 } 2876 if (sticky && cmsg) { 2877 switch (optname) { 2878 case IPV6_PKTINFO: 2879 case IPV6_HOPLIMIT: 2880 case IPV6_NEXTHOP: 2881 case IPV6_HOPOPTS: 2882 case IPV6_DSTOPTS: 2883 case IPV6_RTHDRDSTOPTS: 2884 case IPV6_RTHDR: 2885 case IPV6_USE_MIN_MTU: 2886 case IPV6_DONTFRAG: 2887 case IPV6_OTCLASS: 2888 case IPV6_TCLASS: 2889 return (ENOPROTOOPT); 2890 } 2891 } 2892 2893 switch (optname) { 2894 #ifdef RFC2292 2895 case IPV6_2292PKTINFO: 2896 #endif 2897 case IPV6_PKTINFO: 2898 { 2899 struct ifnet *ifp = NULL; 2900 struct in6_pktinfo *pktinfo; 2901 2902 if (len != sizeof(struct in6_pktinfo)) 2903 return (EINVAL); 2904 2905 pktinfo = (struct in6_pktinfo *)buf; 2906 2907 /* 2908 * An application can clear any sticky IPV6_PKTINFO option by 2909 * doing a "regular" setsockopt with ipi6_addr being 2910 * in6addr_any and ipi6_ifindex being zero. 2911 * [RFC 3542, Section 6] 2912 */ 2913 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 2914 pktinfo->ipi6_ifindex == 0 && 2915 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2916 ip6_clearpktopts(opt, optname); 2917 break; 2918 } 2919 2920 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 2921 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 2922 return (EINVAL); 2923 } 2924 2925 /* validate the interface index if specified. */ 2926 if (pktinfo->ipi6_ifindex >= if_indexlim) { 2927 return (ENXIO); 2928 } 2929 if (pktinfo->ipi6_ifindex) { 2930 ifp = ifindex2ifnet[pktinfo->ipi6_ifindex]; 2931 if (ifp == NULL) 2932 return (ENXIO); 2933 } 2934 2935 /* 2936 * We store the address anyway, and let in6_selectsrc() 2937 * validate the specified address. This is because ipi6_addr 2938 * may not have enough information about its scope zone, and 2939 * we may need additional information (such as outgoing 2940 * interface or the scope zone of a destination address) to 2941 * disambiguate the scope. 2942 * XXX: the delay of the validation may confuse the 2943 * application when it is used as a sticky option. 2944 */ 2945 if (opt->ip6po_pktinfo == NULL) { 2946 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2947 M_IP6OPT, M_NOWAIT); 2948 if (opt->ip6po_pktinfo == NULL) 2949 return (ENOBUFS); 2950 } 2951 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2952 break; 2953 } 2954 2955 #ifdef RFC2292 2956 case IPV6_2292HOPLIMIT: 2957 #endif 2958 case IPV6_HOPLIMIT: 2959 { 2960 int *hlimp; 2961 2962 /* 2963 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2964 * to simplify the ordering among hoplimit options. 2965 */ 2966 if (optname == IPV6_HOPLIMIT && sticky) 2967 return (ENOPROTOOPT); 2968 2969 if (len != sizeof(int)) 2970 return (EINVAL); 2971 hlimp = (int *)buf; 2972 if (*hlimp < -1 || *hlimp > 255) 2973 return (EINVAL); 2974 2975 opt->ip6po_hlim = *hlimp; 2976 break; 2977 } 2978 2979 case IPV6_OTCLASS: 2980 if (len != sizeof(u_int8_t)) 2981 return (EINVAL); 2982 2983 opt->ip6po_tclass = *(u_int8_t *)buf; 2984 break; 2985 2986 case IPV6_TCLASS: 2987 { 2988 int tclass; 2989 2990 if (len != sizeof(int)) 2991 return (EINVAL); 2992 tclass = *(int *)buf; 2993 if (tclass < -1 || tclass > 255) 2994 return (EINVAL); 2995 2996 opt->ip6po_tclass = tclass; 2997 break; 2998 } 2999 3000 #ifdef RFC2292 3001 case IPV6_2292NEXTHOP: 3002 #endif 3003 case IPV6_NEXTHOP: 3004 if (!priv) 3005 return (EPERM); 3006 3007 if (len == 0) { /* just remove the option */ 3008 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3009 break; 3010 } 3011 3012 /* check if cmsg_len is large enough for sa_len */ 3013 if (len < sizeof(struct sockaddr) || len < *buf) 3014 return (EINVAL); 3015 3016 switch (((struct sockaddr *)buf)->sa_family) { 3017 case AF_INET6: 3018 { 3019 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3020 int error; 3021 3022 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3023 return (EINVAL); 3024 3025 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3026 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3027 return (EINVAL); 3028 } 3029 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3030 != 0) { 3031 return (error); 3032 } 3033 break; 3034 } 3035 case AF_LINK: /* eventually be supported? */ 3036 default: 3037 return (EAFNOSUPPORT); 3038 } 3039 3040 /* turn off the previous option, then set the new option. */ 3041 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3042 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3043 if (opt->ip6po_nexthop == NULL) 3044 return (ENOBUFS); 3045 memcpy(opt->ip6po_nexthop, buf, *buf); 3046 break; 3047 3048 #ifdef RFC2292 3049 case IPV6_2292HOPOPTS: 3050 #endif 3051 case IPV6_HOPOPTS: 3052 { 3053 struct ip6_hbh *hbh; 3054 int hbhlen; 3055 3056 /* 3057 * XXX: We don't allow a non-privileged user to set ANY HbH 3058 * options, since per-option restriction has too much 3059 * overhead. 3060 */ 3061 if (!priv) 3062 return (EPERM); 3063 3064 if (len == 0) { 3065 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3066 break; /* just remove the option */ 3067 } 3068 3069 /* message length validation */ 3070 if (len < sizeof(struct ip6_hbh)) 3071 return (EINVAL); 3072 hbh = (struct ip6_hbh *)buf; 3073 hbhlen = (hbh->ip6h_len + 1) << 3; 3074 if (len != hbhlen) 3075 return (EINVAL); 3076 3077 /* turn off the previous option, then set the new option. */ 3078 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3079 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3080 if (opt->ip6po_hbh == NULL) 3081 return (ENOBUFS); 3082 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3083 3084 break; 3085 } 3086 3087 #ifdef RFC2292 3088 case IPV6_2292DSTOPTS: 3089 #endif 3090 case IPV6_DSTOPTS: 3091 case IPV6_RTHDRDSTOPTS: 3092 { 3093 struct ip6_dest *dest, **newdest = NULL; 3094 int destlen; 3095 3096 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3097 return (EPERM); 3098 3099 if (len == 0) { 3100 ip6_clearpktopts(opt, optname); 3101 break; /* just remove the option */ 3102 } 3103 3104 /* message length validation */ 3105 if (len < sizeof(struct ip6_dest)) 3106 return (EINVAL); 3107 dest = (struct ip6_dest *)buf; 3108 destlen = (dest->ip6d_len + 1) << 3; 3109 if (len != destlen) 3110 return (EINVAL); 3111 /* 3112 * Determine the position that the destination options header 3113 * should be inserted; before or after the routing header. 3114 */ 3115 switch (optname) { 3116 case IPV6_2292DSTOPTS: 3117 /* 3118 * The old advanced API is ambiguous on this point. 3119 * Our approach is to determine the position based 3120 * according to the existence of a routing header. 3121 * Note, however, that this depends on the order of the 3122 * extension headers in the ancillary data; the 1st 3123 * part of the destination options header must appear 3124 * before the routing header in the ancillary data, 3125 * too. 3126 * RFC3542 solved the ambiguity by introducing 3127 * separate ancillary data or option types. 3128 */ 3129 if (opt->ip6po_rthdr == NULL) 3130 newdest = &opt->ip6po_dest1; 3131 else 3132 newdest = &opt->ip6po_dest2; 3133 break; 3134 case IPV6_RTHDRDSTOPTS: 3135 newdest = &opt->ip6po_dest1; 3136 break; 3137 case IPV6_DSTOPTS: 3138 newdest = &opt->ip6po_dest2; 3139 break; 3140 } 3141 3142 /* turn off the previous option, then set the new option. */ 3143 ip6_clearpktopts(opt, optname); 3144 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3145 if (*newdest == NULL) 3146 return (ENOBUFS); 3147 memcpy(*newdest, dest, destlen); 3148 3149 break; 3150 } 3151 3152 #ifdef RFC2292 3153 case IPV6_2292RTHDR: 3154 #endif 3155 case IPV6_RTHDR: 3156 { 3157 struct ip6_rthdr *rth; 3158 int rthlen; 3159 3160 if (len == 0) { 3161 ip6_clearpktopts(opt, IPV6_RTHDR); 3162 break; /* just remove the option */ 3163 } 3164 3165 /* message length validation */ 3166 if (len < sizeof(struct ip6_rthdr)) 3167 return (EINVAL); 3168 rth = (struct ip6_rthdr *)buf; 3169 rthlen = (rth->ip6r_len + 1) << 3; 3170 if (len != rthlen) 3171 return (EINVAL); 3172 switch (rth->ip6r_type) { 3173 case IPV6_RTHDR_TYPE_0: 3174 if (rth->ip6r_len == 0) /* must contain one addr */ 3175 return (EINVAL); 3176 if (rth->ip6r_len % 2) /* length must be even */ 3177 return (EINVAL); 3178 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3179 return (EINVAL); 3180 break; 3181 default: 3182 return (EINVAL); /* not supported */ 3183 } 3184 /* turn off the previous option */ 3185 ip6_clearpktopts(opt, IPV6_RTHDR); 3186 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3187 if (opt->ip6po_rthdr == NULL) 3188 return (ENOBUFS); 3189 memcpy(opt->ip6po_rthdr, rth, rthlen); 3190 break; 3191 } 3192 3193 case IPV6_USE_MIN_MTU: 3194 if (len != sizeof(int)) 3195 return (EINVAL); 3196 minmtupolicy = *(int *)buf; 3197 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3198 minmtupolicy != IP6PO_MINMTU_DISABLE && 3199 minmtupolicy != IP6PO_MINMTU_ALL) { 3200 return (EINVAL); 3201 } 3202 opt->ip6po_minmtu = minmtupolicy; 3203 break; 3204 3205 case IPV6_DONTFRAG: 3206 if (len != sizeof(int)) 3207 return (EINVAL); 3208 3209 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3210 /* 3211 * we ignore this option for TCP sockets. 3212 * (RFC3542 leaves this case unspecified.) 3213 */ 3214 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3215 } else 3216 opt->ip6po_flags |= IP6PO_DONTFRAG; 3217 break; 3218 3219 default: 3220 return (ENOPROTOOPT); 3221 } /* end of switch */ 3222 3223 return (0); 3224 } 3225 3226 /* 3227 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3228 * packet to the input queue of a specified interface. Note that this 3229 * calls the output routine of the loopback "driver", but with an interface 3230 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3231 */ 3232 void 3233 ip6_mloopback(struct ifnet *ifp, struct mbuf *m, 3234 const struct sockaddr_in6 *dst) 3235 { 3236 struct mbuf *copym; 3237 struct ip6_hdr *ip6; 3238 3239 copym = m_copy(m, 0, M_COPYALL); 3240 if (copym == NULL) 3241 return; 3242 3243 /* 3244 * Make sure to deep-copy IPv6 header portion in case the data 3245 * is in an mbuf cluster, so that we can safely override the IPv6 3246 * header portion later. 3247 */ 3248 if ((copym->m_flags & M_EXT) != 0 || 3249 copym->m_len < sizeof(struct ip6_hdr)) { 3250 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3251 if (copym == NULL) 3252 return; 3253 } 3254 3255 #ifdef DIAGNOSTIC 3256 if (copym->m_len < sizeof(*ip6)) { 3257 m_freem(copym); 3258 return; 3259 } 3260 #endif 3261 3262 ip6 = mtod(copym, struct ip6_hdr *); 3263 /* 3264 * clear embedded scope identifiers if necessary. 3265 * in6_clearscope will touch the addresses only when necessary. 3266 */ 3267 in6_clearscope(&ip6->ip6_src); 3268 in6_clearscope(&ip6->ip6_dst); 3269 3270 (void)looutput(ifp, copym, (const struct sockaddr *)dst, NULL); 3271 } 3272 3273 /* 3274 * Chop IPv6 header off from the payload. 3275 */ 3276 static int 3277 ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) 3278 { 3279 struct mbuf *mh; 3280 struct ip6_hdr *ip6; 3281 3282 ip6 = mtod(m, struct ip6_hdr *); 3283 if (m->m_len > sizeof(*ip6)) { 3284 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3285 if (mh == 0) { 3286 m_freem(m); 3287 return ENOBUFS; 3288 } 3289 M_MOVE_PKTHDR(mh, m); 3290 MH_ALIGN(mh, sizeof(*ip6)); 3291 m->m_len -= sizeof(*ip6); 3292 m->m_data += sizeof(*ip6); 3293 mh->m_next = m; 3294 m = mh; 3295 m->m_len = sizeof(*ip6); 3296 bcopy((void *)ip6, mtod(m, void *), sizeof(*ip6)); 3297 } 3298 exthdrs->ip6e_ip6 = m; 3299 return 0; 3300 } 3301 3302 /* 3303 * Compute IPv6 extension header length. 3304 */ 3305 int 3306 ip6_optlen(struct in6pcb *in6p) 3307 { 3308 int len; 3309 3310 if (!in6p->in6p_outputopts) 3311 return 0; 3312 3313 len = 0; 3314 #define elen(x) \ 3315 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3316 3317 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3318 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3319 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3320 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3321 return len; 3322 #undef elen 3323 } 3324
Indexes created Tue Sep 30 20:09:53 GMT 2025