ip6_output.c revision 1.94.6.2
1 /* $NetBSD: ip6_output.c,v 1.94.6.2 2006/05/24 10:59:09 yamt 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 1.94.6.2 2006/05/24 10:59:09 yamt 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/ip6_var.h> 95 #include <netinet6/in6_pcb.h> 96 #include <netinet6/nd6.h> 97 #include <netinet6/ip6protosw.h> 98 #include <netinet6/scope6_var.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netkey/key.h> 103 #endif /* IPSEC */ 104 105 #include <net/net_osdep.h> 106 107 #ifdef PFIL_HOOKS 108 extern struct pfil_head inet6_pfil_hook; /* XXX */ 109 #endif 110 111 struct ip6_exthdrs { 112 struct mbuf *ip6e_ip6; 113 struct mbuf *ip6e_hbh; 114 struct mbuf *ip6e_dest1; 115 struct mbuf *ip6e_rthdr; 116 struct mbuf *ip6e_dest2; 117 }; 118 119 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 120 int, int)); 121 static int ip6_getpcbopt __P((struct ip6_pktopts *, int, struct mbuf **)); 122 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, int, 123 int, int, int)); 124 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 125 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 126 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 127 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 128 struct ip6_frag **)); 129 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 130 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 131 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 132 struct ifnet *, struct in6_addr *, u_long *, int *)); 133 static int copypktopts __P((struct ip6_pktopts *, struct ip6_pktopts *, int)); 134 135 #ifdef RFC2292 136 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 137 struct socket *)); 138 #endif 139 140 #define IN6_NEED_CHECKSUM(ifp, csum_flags) \ 141 (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \ 142 (((csum_flags) & M_CSUM_UDPv6) != 0 && udp_do_loopback_cksum) || \ 143 (((csum_flags) & M_CSUM_TCPv6) != 0 && tcp_do_loopback_cksum))) 144 145 /* 146 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 147 * header (with pri, len, nxt, hlim, src, dst). 148 * This function may modify ver and hlim only. 149 * The mbuf chain containing the packet will be freed. 150 * The mbuf opt, if present, will not be freed. 151 * 152 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 153 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 154 * which is rt_rmx.rmx_mtu. 155 */ 156 int 157 ip6_output(m0, opt, ro, flags, im6o, so, ifpp) 158 struct mbuf *m0; 159 struct ip6_pktopts *opt; 160 struct route_in6 *ro; 161 int flags; 162 struct ip6_moptions *im6o; 163 struct socket *so; 164 struct ifnet **ifpp; /* XXX: just for statistics */ 165 { 166 struct ip6_hdr *ip6, *mhip6; 167 struct ifnet *ifp, *origifp; 168 struct mbuf *m = m0; 169 int hlen, tlen, len, off; 170 struct route_in6 ip6route; 171 struct rtentry *rt = NULL; 172 struct sockaddr_in6 *dst, src_sa, dst_sa; 173 int error = 0; 174 struct in6_ifaddr *ia = NULL; 175 u_long mtu; 176 int alwaysfrag, dontfrag; 177 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 178 struct ip6_exthdrs exthdrs; 179 struct in6_addr finaldst, src0, dst0; 180 u_int32_t zone; 181 struct route_in6 *ro_pmtu = NULL; 182 int hdrsplit = 0; 183 int needipsec = 0; 184 #ifdef IPSEC 185 int needipsectun = 0; 186 struct secpolicy *sp = NULL; 187 188 ip6 = mtod(m, struct ip6_hdr *); 189 #endif /* IPSEC */ 190 191 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, sizeof(struct ip6_hdr)); 192 193 #define MAKE_EXTHDR(hp, mp) \ 194 do { \ 195 if (hp) { \ 196 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 197 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 198 ((eh)->ip6e_len + 1) << 3); \ 199 if (error) \ 200 goto freehdrs; \ 201 } \ 202 } while (/*CONSTCOND*/ 0) 203 204 bzero(&exthdrs, sizeof(exthdrs)); 205 if (opt) { 206 /* Hop-by-Hop options header */ 207 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 208 /* Destination options header(1st part) */ 209 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 210 /* Routing header */ 211 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 212 /* Destination options header(2nd part) */ 213 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 214 } 215 216 #ifdef IPSEC 217 if ((flags & IPV6_FORWARDING) != 0) { 218 needipsec = 0; 219 goto skippolicycheck; 220 } 221 222 /* get a security policy for this packet */ 223 if (so == NULL) 224 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 225 else { 226 if (IPSEC_PCB_SKIP_IPSEC(sotoinpcb_hdr(so)->inph_sp, 227 IPSEC_DIR_OUTBOUND)) { 228 needipsec = 0; 229 goto skippolicycheck; 230 } 231 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 232 } 233 234 if (sp == NULL) { 235 ipsec6stat.out_inval++; 236 goto freehdrs; 237 } 238 239 error = 0; 240 241 /* check policy */ 242 switch (sp->policy) { 243 case IPSEC_POLICY_DISCARD: 244 /* 245 * This packet is just discarded. 246 */ 247 ipsec6stat.out_polvio++; 248 goto freehdrs; 249 250 case IPSEC_POLICY_BYPASS: 251 case IPSEC_POLICY_NONE: 252 /* no need to do IPsec. */ 253 needipsec = 0; 254 break; 255 256 case IPSEC_POLICY_IPSEC: 257 if (sp->req == NULL) { 258 /* XXX should be panic ? */ 259 printf("ip6_output: No IPsec request specified.\n"); 260 error = EINVAL; 261 goto freehdrs; 262 } 263 needipsec = 1; 264 break; 265 266 case IPSEC_POLICY_ENTRUST: 267 default: 268 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 269 } 270 271 skippolicycheck:; 272 #endif /* IPSEC */ 273 274 if (needipsec && 275 (m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 276 in6_delayed_cksum(m); 277 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 278 } 279 280 /* 281 * Calculate the total length of the extension header chain. 282 * Keep the length of the unfragmentable part for fragmentation. 283 */ 284 optlen = 0; 285 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 286 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 287 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 288 unfragpartlen = optlen + sizeof(struct ip6_hdr); 289 /* NOTE: we don't add AH/ESP length here. do that later. */ 290 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 291 292 /* 293 * If we need IPsec, or there is at least one extension header, 294 * separate IP6 header from the payload. 295 */ 296 if ((needipsec || optlen) && !hdrsplit) { 297 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 298 m = NULL; 299 goto freehdrs; 300 } 301 m = exthdrs.ip6e_ip6; 302 hdrsplit++; 303 } 304 305 /* adjust pointer */ 306 ip6 = mtod(m, struct ip6_hdr *); 307 308 /* adjust mbuf packet header length */ 309 m->m_pkthdr.len += optlen; 310 plen = m->m_pkthdr.len - sizeof(*ip6); 311 312 /* If this is a jumbo payload, insert a jumbo payload option. */ 313 if (plen > IPV6_MAXPACKET) { 314 if (!hdrsplit) { 315 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 316 m = NULL; 317 goto freehdrs; 318 } 319 m = exthdrs.ip6e_ip6; 320 hdrsplit++; 321 } 322 /* adjust pointer */ 323 ip6 = mtod(m, struct ip6_hdr *); 324 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 325 goto freehdrs; 326 optlen += 8; /* XXX JUMBOOPTLEN */ 327 ip6->ip6_plen = 0; 328 } else 329 ip6->ip6_plen = htons(plen); 330 331 /* 332 * Concatenate headers and fill in next header fields. 333 * Here we have, on "m" 334 * IPv6 payload 335 * and we insert headers accordingly. Finally, we should be getting: 336 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 337 * 338 * during the header composing process, "m" points to IPv6 header. 339 * "mprev" points to an extension header prior to esp. 340 */ 341 { 342 u_char *nexthdrp = &ip6->ip6_nxt; 343 struct mbuf *mprev = m; 344 345 /* 346 * we treat dest2 specially. this makes IPsec processing 347 * much easier. the goal here is to make mprev point the 348 * mbuf prior to dest2. 349 * 350 * result: IPv6 dest2 payload 351 * m and mprev will point to IPv6 header. 352 */ 353 if (exthdrs.ip6e_dest2) { 354 if (!hdrsplit) 355 panic("assumption failed: hdr not split"); 356 exthdrs.ip6e_dest2->m_next = m->m_next; 357 m->m_next = exthdrs.ip6e_dest2; 358 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 359 ip6->ip6_nxt = IPPROTO_DSTOPTS; 360 } 361 362 #define MAKE_CHAIN(m, mp, p, i)\ 363 do {\ 364 if (m) {\ 365 if (!hdrsplit) \ 366 panic("assumption failed: hdr not split"); \ 367 *mtod((m), u_char *) = *(p);\ 368 *(p) = (i);\ 369 p = mtod((m), u_char *);\ 370 (m)->m_next = (mp)->m_next;\ 371 (mp)->m_next = (m);\ 372 (mp) = (m);\ 373 }\ 374 } while (/*CONSTCOND*/ 0) 375 /* 376 * result: IPv6 hbh dest1 rthdr dest2 payload 377 * m will point to IPv6 header. mprev will point to the 378 * extension header prior to dest2 (rthdr in the above case). 379 */ 380 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 381 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 382 IPPROTO_DSTOPTS); 383 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 384 IPPROTO_ROUTING); 385 386 M_CSUM_DATA_IPv6_HL_SET(m->m_pkthdr.csum_data, 387 sizeof(struct ip6_hdr) + optlen); 388 389 #ifdef IPSEC 390 if (!needipsec) 391 goto skip_ipsec2; 392 393 /* 394 * pointers after IPsec headers are not valid any more. 395 * other pointers need a great care too. 396 * (IPsec routines should not mangle mbufs prior to AH/ESP) 397 */ 398 exthdrs.ip6e_dest2 = NULL; 399 400 { 401 struct ip6_rthdr *rh = NULL; 402 int segleft_org = 0; 403 struct ipsec_output_state state; 404 405 if (exthdrs.ip6e_rthdr) { 406 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 407 segleft_org = rh->ip6r_segleft; 408 rh->ip6r_segleft = 0; 409 } 410 411 bzero(&state, sizeof(state)); 412 state.m = m; 413 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 414 &needipsectun); 415 m = state.m; 416 if (error) { 417 /* mbuf is already reclaimed in ipsec6_output_trans. */ 418 m = NULL; 419 switch (error) { 420 case EHOSTUNREACH: 421 case ENETUNREACH: 422 case EMSGSIZE: 423 case ENOBUFS: 424 case ENOMEM: 425 break; 426 default: 427 printf("ip6_output (ipsec): error code %d\n", error); 428 /* FALLTHROUGH */ 429 case ENOENT: 430 /* don't show these error codes to the user */ 431 error = 0; 432 break; 433 } 434 goto bad; 435 } 436 if (exthdrs.ip6e_rthdr) { 437 /* ah6_output doesn't modify mbuf chain */ 438 rh->ip6r_segleft = segleft_org; 439 } 440 } 441 skip_ipsec2:; 442 #endif 443 } 444 445 /* 446 * If there is a routing header, replace destination address field 447 * with the first hop of the routing header. 448 */ 449 if (exthdrs.ip6e_rthdr) { 450 struct ip6_rthdr *rh; 451 struct ip6_rthdr0 *rh0; 452 struct in6_addr *addr; 453 struct sockaddr_in6 sa; 454 455 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 456 struct ip6_rthdr *)); 457 finaldst = ip6->ip6_dst; 458 switch (rh->ip6r_type) { 459 case IPV6_RTHDR_TYPE_0: 460 rh0 = (struct ip6_rthdr0 *)rh; 461 addr = (struct in6_addr *)(rh0 + 1); 462 463 /* 464 * construct a sockaddr_in6 form of 465 * the first hop. 466 * 467 * XXX: we may not have enough 468 * information about its scope zone; 469 * there is no standard API to pass 470 * the information from the 471 * application. 472 */ 473 bzero(&sa, sizeof(sa)); 474 sa.sin6_family = AF_INET6; 475 sa.sin6_len = sizeof(sa); 476 sa.sin6_addr = addr[0]; 477 if ((error = sa6_embedscope(&sa, 478 ip6_use_defzone)) != 0) { 479 goto bad; 480 } 481 ip6->ip6_dst = sa.sin6_addr; 482 (void)memmove(&addr[0], &addr[1], 483 sizeof(struct in6_addr) * 484 (rh0->ip6r0_segleft - 1)); 485 addr[rh0->ip6r0_segleft - 1] = finaldst; 486 /* XXX */ 487 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 488 break; 489 default: /* is it possible? */ 490 error = EINVAL; 491 goto bad; 492 } 493 } 494 495 /* Source address validation */ 496 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 497 (flags & IPV6_UNSPECSRC) == 0) { 498 error = EOPNOTSUPP; 499 ip6stat.ip6s_badscope++; 500 goto bad; 501 } 502 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 503 error = EOPNOTSUPP; 504 ip6stat.ip6s_badscope++; 505 goto bad; 506 } 507 508 ip6stat.ip6s_localout++; 509 510 /* 511 * Route packet. 512 */ 513 /* initialize cached route */ 514 if (ro == 0) { 515 ro = &ip6route; 516 bzero((caddr_t)ro, sizeof(*ro)); 517 } 518 ro_pmtu = ro; 519 if (opt && opt->ip6po_rthdr) 520 ro = &opt->ip6po_route; 521 dst = (struct sockaddr_in6 *)&ro->ro_dst; 522 523 /* 524 * if specified, try to fill in the traffic class field. 525 * do not override if a non-zero value is already set. 526 * we check the diffserv field and the ecn field separately. 527 */ 528 if (opt && opt->ip6po_tclass >= 0) { 529 int mask = 0; 530 531 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 532 mask |= 0xfc; 533 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 534 mask |= 0x03; 535 if (mask != 0) 536 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 537 } 538 539 /* fill in or override the hop limit field, if necessary. */ 540 if (opt && opt->ip6po_hlim != -1) 541 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 542 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 543 if (im6o != NULL) 544 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 545 else 546 ip6->ip6_hlim = ip6_defmcasthlim; 547 } 548 549 #ifdef IPSEC 550 if (needipsec && needipsectun) { 551 struct ipsec_output_state state; 552 553 /* 554 * All the extension headers will become inaccessible 555 * (since they can be encrypted). 556 * Don't panic, we need no more updates to extension headers 557 * on inner IPv6 packet (since they are now encapsulated). 558 * 559 * IPv6 [ESP|AH] IPv6 [extension headers] payload 560 */ 561 bzero(&exthdrs, sizeof(exthdrs)); 562 exthdrs.ip6e_ip6 = m; 563 564 bzero(&state, sizeof(state)); 565 state.m = m; 566 state.ro = (struct route *)ro; 567 state.dst = (struct sockaddr *)dst; 568 569 error = ipsec6_output_tunnel(&state, sp, flags); 570 571 m = state.m; 572 ro_pmtu = ro = (struct route_in6 *)state.ro; 573 dst = (struct sockaddr_in6 *)state.dst; 574 if (error) { 575 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 576 m0 = m = NULL; 577 m = NULL; 578 switch (error) { 579 case EHOSTUNREACH: 580 case ENETUNREACH: 581 case EMSGSIZE: 582 case ENOBUFS: 583 case ENOMEM: 584 break; 585 default: 586 printf("ip6_output (ipsec): error code %d\n", error); 587 /* FALLTHROUGH */ 588 case ENOENT: 589 /* don't show these error codes to the user */ 590 error = 0; 591 break; 592 } 593 goto bad; 594 } 595 596 exthdrs.ip6e_ip6 = m; 597 } 598 #endif /* IPSEC */ 599 600 /* adjust pointer */ 601 ip6 = mtod(m, struct ip6_hdr *); 602 603 bzero(&dst_sa, sizeof(dst_sa)); 604 dst_sa.sin6_family = AF_INET6; 605 dst_sa.sin6_len = sizeof(dst_sa); 606 dst_sa.sin6_addr = ip6->ip6_dst; 607 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, &ifp, &rt, 0)) 608 != 0) { 609 switch (error) { 610 case EHOSTUNREACH: 611 ip6stat.ip6s_noroute++; 612 break; 613 case EADDRNOTAVAIL: 614 default: 615 break; /* XXX statistics? */ 616 } 617 if (ifp != NULL) 618 in6_ifstat_inc(ifp, ifs6_out_discard); 619 goto bad; 620 } 621 if (rt == NULL) { 622 /* 623 * If in6_selectroute() does not return a route entry, 624 * dst may not have been updated. 625 */ 626 *dst = dst_sa; /* XXX */ 627 } 628 629 /* 630 * then rt (for unicast) and ifp must be non-NULL valid values. 631 */ 632 if ((flags & IPV6_FORWARDING) == 0) { 633 /* XXX: the FORWARDING flag can be set for mrouting. */ 634 in6_ifstat_inc(ifp, ifs6_out_request); 635 } 636 if (rt != NULL) { 637 ia = (struct in6_ifaddr *)(rt->rt_ifa); 638 rt->rt_use++; 639 } 640 641 /* 642 * The outgoing interface must be in the zone of source and 643 * destination addresses. We should use ia_ifp to support the 644 * case of sending packets to an address of our own. 645 */ 646 if (ia != NULL && ia->ia_ifp) 647 origifp = ia->ia_ifp; 648 else 649 origifp = ifp; 650 651 src0 = ip6->ip6_src; 652 if (in6_setscope(&src0, origifp, &zone)) 653 goto badscope; 654 bzero(&src_sa, sizeof(src_sa)); 655 src_sa.sin6_family = AF_INET6; 656 src_sa.sin6_len = sizeof(src_sa); 657 src_sa.sin6_addr = ip6->ip6_src; 658 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 659 goto badscope; 660 661 dst0 = ip6->ip6_dst; 662 if (in6_setscope(&dst0, origifp, &zone)) 663 goto badscope; 664 /* re-initialize to be sure */ 665 bzero(&dst_sa, sizeof(dst_sa)); 666 dst_sa.sin6_family = AF_INET6; 667 dst_sa.sin6_len = sizeof(dst_sa); 668 dst_sa.sin6_addr = ip6->ip6_dst; 669 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) 670 goto badscope; 671 672 /* scope check is done. */ 673 goto routefound; 674 675 badscope: 676 ip6stat.ip6s_badscope++; 677 in6_ifstat_inc(origifp, ifs6_out_discard); 678 if (error == 0) 679 error = EHOSTUNREACH; /* XXX */ 680 goto bad; 681 682 routefound: 683 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 684 if (opt && opt->ip6po_nextroute.ro_rt) { 685 /* 686 * The nexthop is explicitly specified by the 687 * application. We assume the next hop is an IPv6 688 * address. 689 */ 690 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 691 } else if ((rt->rt_flags & RTF_GATEWAY)) 692 dst = (struct sockaddr_in6 *)rt->rt_gateway; 693 } 694 695 /* 696 * XXXXXX: original code follows: 697 */ 698 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 699 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 700 else { 701 struct in6_multi *in6m; 702 703 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 704 705 in6_ifstat_inc(ifp, ifs6_out_mcast); 706 707 /* 708 * Confirm that the outgoing interface supports multicast. 709 */ 710 if (!(ifp->if_flags & IFF_MULTICAST)) { 711 ip6stat.ip6s_noroute++; 712 in6_ifstat_inc(ifp, ifs6_out_discard); 713 error = ENETUNREACH; 714 goto bad; 715 } 716 717 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 718 if (in6m != NULL && 719 (im6o == NULL || im6o->im6o_multicast_loop)) { 720 /* 721 * If we belong to the destination multicast group 722 * on the outgoing interface, and the caller did not 723 * forbid loopback, loop back a copy. 724 */ 725 ip6_mloopback(ifp, m, dst); 726 } else { 727 /* 728 * If we are acting as a multicast router, perform 729 * multicast forwarding as if the packet had just 730 * arrived on the interface to which we are about 731 * to send. The multicast forwarding function 732 * recursively calls this function, using the 733 * IPV6_FORWARDING flag to prevent infinite recursion. 734 * 735 * Multicasts that are looped back by ip6_mloopback(), 736 * above, will be forwarded by the ip6_input() routine, 737 * if necessary. 738 */ 739 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 740 if (ip6_mforward(ip6, ifp, m) != 0) { 741 m_freem(m); 742 goto done; 743 } 744 } 745 } 746 /* 747 * Multicasts with a hoplimit of zero may be looped back, 748 * above, but must not be transmitted on a network. 749 * Also, multicasts addressed to the loopback interface 750 * are not sent -- the above call to ip6_mloopback() will 751 * loop back a copy if this host actually belongs to the 752 * destination group on the loopback interface. 753 */ 754 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 755 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 756 m_freem(m); 757 goto done; 758 } 759 } 760 761 /* 762 * Fill the outgoing inteface to tell the upper layer 763 * to increment per-interface statistics. 764 */ 765 if (ifpp) 766 *ifpp = ifp; 767 768 /* Determine path MTU. */ 769 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 770 &alwaysfrag)) != 0) 771 goto bad; 772 #ifdef IPSEC 773 if (needipsectun) 774 mtu = IPV6_MMTU; 775 #endif 776 777 /* 778 * The caller of this function may specify to use the minimum MTU 779 * in some cases. 780 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 781 * setting. The logic is a bit complicated; by default, unicast 782 * packets will follow path MTU while multicast packets will be sent at 783 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 784 * including unicast ones will be sent at the minimum MTU. Multicast 785 * packets will always be sent at the minimum MTU unless 786 * IP6PO_MINMTU_DISABLE is explicitly specified. 787 * See RFC 3542 for more details. 788 */ 789 if (mtu > IPV6_MMTU) { 790 if ((flags & IPV6_MINMTU)) 791 mtu = IPV6_MMTU; 792 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 793 mtu = IPV6_MMTU; 794 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 795 (opt == NULL || 796 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 797 mtu = IPV6_MMTU; 798 } 799 } 800 801 /* 802 * clear embedded scope identifiers if necessary. 803 * in6_clearscope will touch the addresses only when necessary. 804 */ 805 in6_clearscope(&ip6->ip6_src); 806 in6_clearscope(&ip6->ip6_dst); 807 808 /* 809 * If the outgoing packet contains a hop-by-hop options header, 810 * it must be examined and processed even by the source node. 811 * (RFC 2460, section 4.) 812 */ 813 if (exthdrs.ip6e_hbh) { 814 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 815 u_int32_t dummy1; /* XXX unused */ 816 u_int32_t dummy2; /* XXX unused */ 817 818 /* 819 * XXX: if we have to send an ICMPv6 error to the sender, 820 * we need the M_LOOP flag since icmp6_error() expects 821 * the IPv6 and the hop-by-hop options header are 822 * continuous unless the flag is set. 823 */ 824 m->m_flags |= M_LOOP; 825 m->m_pkthdr.rcvif = ifp; 826 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 827 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 828 &dummy1, &dummy2) < 0) { 829 /* m was already freed at this point */ 830 error = EINVAL;/* better error? */ 831 goto done; 832 } 833 m->m_flags &= ~M_LOOP; /* XXX */ 834 m->m_pkthdr.rcvif = NULL; 835 } 836 837 #ifdef PFIL_HOOKS 838 /* 839 * Run through list of hooks for output packets. 840 */ 841 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 842 goto done; 843 if (m == NULL) 844 goto done; 845 ip6 = mtod(m, struct ip6_hdr *); 846 #endif /* PFIL_HOOKS */ 847 /* 848 * Send the packet to the outgoing interface. 849 * If necessary, do IPv6 fragmentation before sending. 850 * 851 * the logic here is rather complex: 852 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 853 * 1-a: send as is if tlen <= path mtu 854 * 1-b: fragment if tlen > path mtu 855 * 856 * 2: if user asks us not to fragment (dontfrag == 1) 857 * 2-a: send as is if tlen <= interface mtu 858 * 2-b: error if tlen > interface mtu 859 * 860 * 3: if we always need to attach fragment header (alwaysfrag == 1) 861 * always fragment 862 * 863 * 4: if dontfrag == 1 && alwaysfrag == 1 864 * error, as we cannot handle this conflicting request 865 */ 866 tlen = m->m_pkthdr.len; 867 868 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 869 dontfrag = 1; 870 else 871 dontfrag = 0; 872 873 if (dontfrag && alwaysfrag) { /* case 4 */ 874 /* conflicting request - can't transmit */ 875 error = EMSGSIZE; 876 goto bad; 877 } 878 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 879 /* 880 * Even if the DONTFRAG option is specified, we cannot send the 881 * packet when the data length is larger than the MTU of the 882 * outgoing interface. 883 * Notify the error by sending IPV6_PATHMTU ancillary data as 884 * well as returning an error code (the latter is not described 885 * in the API spec.) 886 */ 887 u_int32_t mtu32; 888 struct ip6ctlparam ip6cp; 889 890 mtu32 = (u_int32_t)mtu; 891 bzero(&ip6cp, sizeof(ip6cp)); 892 ip6cp.ip6c_cmdarg = (void *)&mtu32; 893 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 894 (void *)&ip6cp); 895 896 error = EMSGSIZE; 897 goto bad; 898 } 899 900 /* 901 * transmit packet without fragmentation 902 */ 903 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 904 struct in6_ifaddr *ia6; 905 int sw_csum; 906 907 ip6 = mtod(m, struct ip6_hdr *); 908 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 909 if (ia6) { 910 /* Record statistics for this interface address. */ 911 ia6->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; 912 } 913 #ifdef IPSEC 914 /* clean ipsec history once it goes out of the node */ 915 ipsec_delaux(m); 916 #endif 917 918 sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx; 919 if ((sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0) { 920 if (IN6_NEED_CHECKSUM(ifp, 921 sw_csum & (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 922 in6_delayed_cksum(m); 923 } 924 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 925 } 926 927 error = nd6_output(ifp, origifp, m, dst, rt); 928 goto done; 929 } 930 931 /* 932 * try to fragment the packet. case 1-b and 3 933 */ 934 if (mtu < IPV6_MMTU) { 935 /* path MTU cannot be less than IPV6_MMTU */ 936 error = EMSGSIZE; 937 in6_ifstat_inc(ifp, ifs6_out_fragfail); 938 goto bad; 939 } else if (ip6->ip6_plen == 0) { 940 /* jumbo payload cannot be fragmented */ 941 error = EMSGSIZE; 942 in6_ifstat_inc(ifp, ifs6_out_fragfail); 943 goto bad; 944 } else { 945 struct mbuf **mnext, *m_frgpart; 946 struct ip6_frag *ip6f; 947 u_int32_t id = htonl(ip6_randomid()); 948 u_char nextproto; 949 struct ip6ctlparam ip6cp; 950 u_int32_t mtu32; 951 952 /* 953 * Too large for the destination or interface; 954 * fragment if possible. 955 * Must be able to put at least 8 bytes per fragment. 956 */ 957 hlen = unfragpartlen; 958 if (mtu > IPV6_MAXPACKET) 959 mtu = IPV6_MAXPACKET; 960 961 /* Notify a proper path MTU to applications. */ 962 mtu32 = (u_int32_t)mtu; 963 bzero(&ip6cp, sizeof(ip6cp)); 964 ip6cp.ip6c_cmdarg = (void *)&mtu32; 965 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 966 (void *)&ip6cp); 967 968 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 969 if (len < 8) { 970 error = EMSGSIZE; 971 in6_ifstat_inc(ifp, ifs6_out_fragfail); 972 goto bad; 973 } 974 975 mnext = &m->m_nextpkt; 976 977 /* 978 * Change the next header field of the last header in the 979 * unfragmentable part. 980 */ 981 if (exthdrs.ip6e_rthdr) { 982 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 983 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 984 } else if (exthdrs.ip6e_dest1) { 985 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 986 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 987 } else if (exthdrs.ip6e_hbh) { 988 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 989 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 990 } else { 991 nextproto = ip6->ip6_nxt; 992 ip6->ip6_nxt = IPPROTO_FRAGMENT; 993 } 994 995 if ((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) 996 != 0) { 997 if (IN6_NEED_CHECKSUM(ifp, 998 m->m_pkthdr.csum_flags & 999 (M_CSUM_UDPv6|M_CSUM_TCPv6))) { 1000 in6_delayed_cksum(m); 1001 } 1002 m->m_pkthdr.csum_flags &= ~(M_CSUM_UDPv6|M_CSUM_TCPv6); 1003 } 1004 1005 /* 1006 * Loop through length of segment after first fragment, 1007 * make new header and copy data of each part and link onto 1008 * chain. 1009 */ 1010 m0 = m; 1011 for (off = hlen; off < tlen; off += len) { 1012 struct mbuf *mlast; 1013 1014 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1015 if (!m) { 1016 error = ENOBUFS; 1017 ip6stat.ip6s_odropped++; 1018 goto sendorfree; 1019 } 1020 m->m_pkthdr.rcvif = NULL; 1021 m->m_flags = m0->m_flags & M_COPYFLAGS; 1022 *mnext = m; 1023 mnext = &m->m_nextpkt; 1024 m->m_data += max_linkhdr; 1025 mhip6 = mtod(m, struct ip6_hdr *); 1026 *mhip6 = *ip6; 1027 m->m_len = sizeof(*mhip6); 1028 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1029 if (error) { 1030 ip6stat.ip6s_odropped++; 1031 goto sendorfree; 1032 } 1033 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 1034 if (off + len >= tlen) 1035 len = tlen - off; 1036 else 1037 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1038 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 1039 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1040 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1041 error = ENOBUFS; 1042 ip6stat.ip6s_odropped++; 1043 goto sendorfree; 1044 } 1045 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 1046 ; 1047 mlast->m_next = m_frgpart; 1048 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1049 m->m_pkthdr.rcvif = (struct ifnet *)0; 1050 ip6f->ip6f_reserved = 0; 1051 ip6f->ip6f_ident = id; 1052 ip6f->ip6f_nxt = nextproto; 1053 ip6stat.ip6s_ofragments++; 1054 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1055 } 1056 1057 in6_ifstat_inc(ifp, ifs6_out_fragok); 1058 } 1059 1060 /* 1061 * Remove leading garbages. 1062 */ 1063 sendorfree: 1064 m = m0->m_nextpkt; 1065 m0->m_nextpkt = 0; 1066 m_freem(m0); 1067 for (m0 = m; m; m = m0) { 1068 m0 = m->m_nextpkt; 1069 m->m_nextpkt = 0; 1070 if (error == 0) { 1071 struct in6_ifaddr *ia6; 1072 ip6 = mtod(m, struct ip6_hdr *); 1073 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1074 if (ia6) { 1075 /* 1076 * Record statistics for this interface 1077 * address. 1078 */ 1079 ia6->ia_ifa.ifa_data.ifad_outbytes += 1080 m->m_pkthdr.len; 1081 } 1082 #ifdef IPSEC 1083 /* clean ipsec history once it goes out of the node */ 1084 ipsec_delaux(m); 1085 #endif 1086 error = nd6_output(ifp, origifp, m, dst, rt); 1087 } else 1088 m_freem(m); 1089 } 1090 1091 if (error == 0) 1092 ip6stat.ip6s_fragmented++; 1093 1094 done: 1095 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1096 RTFREE(ro->ro_rt); 1097 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1098 RTFREE(ro_pmtu->ro_rt); 1099 } 1100 1101 #ifdef IPSEC 1102 if (sp != NULL) 1103 key_freesp(sp); 1104 #endif /* IPSEC */ 1105 1106 return (error); 1107 1108 freehdrs: 1109 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1110 m_freem(exthdrs.ip6e_dest1); 1111 m_freem(exthdrs.ip6e_rthdr); 1112 m_freem(exthdrs.ip6e_dest2); 1113 /* FALLTHROUGH */ 1114 bad: 1115 m_freem(m); 1116 goto done; 1117 } 1118 1119 static int 1120 ip6_copyexthdr(mp, hdr, hlen) 1121 struct mbuf **mp; 1122 caddr_t hdr; 1123 int hlen; 1124 { 1125 struct mbuf *m; 1126 1127 if (hlen > MCLBYTES) 1128 return (ENOBUFS); /* XXX */ 1129 1130 MGET(m, M_DONTWAIT, MT_DATA); 1131 if (!m) 1132 return (ENOBUFS); 1133 1134 if (hlen > MLEN) { 1135 MCLGET(m, M_DONTWAIT); 1136 if ((m->m_flags & M_EXT) == 0) { 1137 m_free(m); 1138 return (ENOBUFS); 1139 } 1140 } 1141 m->m_len = hlen; 1142 if (hdr) 1143 bcopy(hdr, mtod(m, caddr_t), hlen); 1144 1145 *mp = m; 1146 return (0); 1147 } 1148 1149 /* 1150 * Process a delayed payload checksum calculation. 1151 */ 1152 void 1153 in6_delayed_cksum(struct mbuf *m) 1154 { 1155 uint16_t csum, offset; 1156 1157 KASSERT((m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1158 KASSERT((~m->m_pkthdr.csum_flags & (M_CSUM_UDPv6|M_CSUM_TCPv6)) != 0); 1159 KASSERT((m->m_pkthdr.csum_flags 1160 & (M_CSUM_UDPv4|M_CSUM_TCPv4|M_CSUM_TSOv4)) == 0); 1161 1162 offset = M_CSUM_DATA_IPv6_HL(m->m_pkthdr.csum_data); 1163 csum = in6_cksum(m, 0, offset, m->m_pkthdr.len - offset); 1164 if (csum == 0 && (m->m_pkthdr.csum_flags & M_CSUM_UDPv6) != 0) { 1165 csum = 0xffff; 1166 } 1167 1168 offset += M_CSUM_DATA_IPv6_OFFSET(m->m_pkthdr.csum_data); 1169 if ((offset + sizeof(csum)) > m->m_len) { 1170 m_copyback(m, offset, sizeof(csum), &csum); 1171 } else { 1172 *(uint16_t *)(mtod(m, caddr_t) + offset) = csum; 1173 } 1174 } 1175 1176 /* 1177 * Insert jumbo payload option. 1178 */ 1179 static int 1180 ip6_insert_jumboopt(exthdrs, plen) 1181 struct ip6_exthdrs *exthdrs; 1182 u_int32_t plen; 1183 { 1184 struct mbuf *mopt; 1185 u_int8_t *optbuf; 1186 u_int32_t v; 1187 1188 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1189 1190 /* 1191 * If there is no hop-by-hop options header, allocate new one. 1192 * If there is one but it doesn't have enough space to store the 1193 * jumbo payload option, allocate a cluster to store the whole options. 1194 * Otherwise, use it to store the options. 1195 */ 1196 if (exthdrs->ip6e_hbh == 0) { 1197 MGET(mopt, M_DONTWAIT, MT_DATA); 1198 if (mopt == 0) 1199 return (ENOBUFS); 1200 mopt->m_len = JUMBOOPTLEN; 1201 optbuf = mtod(mopt, u_int8_t *); 1202 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1203 exthdrs->ip6e_hbh = mopt; 1204 } else { 1205 struct ip6_hbh *hbh; 1206 1207 mopt = exthdrs->ip6e_hbh; 1208 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1209 /* 1210 * XXX assumption: 1211 * - exthdrs->ip6e_hbh is not referenced from places 1212 * other than exthdrs. 1213 * - exthdrs->ip6e_hbh is not an mbuf chain. 1214 */ 1215 int oldoptlen = mopt->m_len; 1216 struct mbuf *n; 1217 1218 /* 1219 * XXX: give up if the whole (new) hbh header does 1220 * not fit even in an mbuf cluster. 1221 */ 1222 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1223 return (ENOBUFS); 1224 1225 /* 1226 * As a consequence, we must always prepare a cluster 1227 * at this point. 1228 */ 1229 MGET(n, M_DONTWAIT, MT_DATA); 1230 if (n) { 1231 MCLGET(n, M_DONTWAIT); 1232 if ((n->m_flags & M_EXT) == 0) { 1233 m_freem(n); 1234 n = NULL; 1235 } 1236 } 1237 if (!n) 1238 return (ENOBUFS); 1239 n->m_len = oldoptlen + JUMBOOPTLEN; 1240 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1241 oldoptlen); 1242 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1243 m_freem(mopt); 1244 mopt = exthdrs->ip6e_hbh = n; 1245 } else { 1246 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1247 mopt->m_len += JUMBOOPTLEN; 1248 } 1249 optbuf[0] = IP6OPT_PADN; 1250 optbuf[1] = 0; 1251 1252 /* 1253 * Adjust the header length according to the pad and 1254 * the jumbo payload option. 1255 */ 1256 hbh = mtod(mopt, struct ip6_hbh *); 1257 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1258 } 1259 1260 /* fill in the option. */ 1261 optbuf[2] = IP6OPT_JUMBO; 1262 optbuf[3] = 4; 1263 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1264 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1265 1266 /* finally, adjust the packet header length */ 1267 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1268 1269 return (0); 1270 #undef JUMBOOPTLEN 1271 } 1272 1273 /* 1274 * Insert fragment header and copy unfragmentable header portions. 1275 */ 1276 static int 1277 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1278 struct mbuf *m0, *m; 1279 int hlen; 1280 struct ip6_frag **frghdrp; 1281 { 1282 struct mbuf *n, *mlast; 1283 1284 if (hlen > sizeof(struct ip6_hdr)) { 1285 n = m_copym(m0, sizeof(struct ip6_hdr), 1286 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1287 if (n == 0) 1288 return (ENOBUFS); 1289 m->m_next = n; 1290 } else 1291 n = m; 1292 1293 /* Search for the last mbuf of unfragmentable part. */ 1294 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1295 ; 1296 1297 if ((mlast->m_flags & M_EXT) == 0 && 1298 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1299 /* use the trailing space of the last mbuf for the fragment hdr */ 1300 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1301 mlast->m_len); 1302 mlast->m_len += sizeof(struct ip6_frag); 1303 m->m_pkthdr.len += sizeof(struct ip6_frag); 1304 } else { 1305 /* allocate a new mbuf for the fragment header */ 1306 struct mbuf *mfrg; 1307 1308 MGET(mfrg, M_DONTWAIT, MT_DATA); 1309 if (mfrg == 0) 1310 return (ENOBUFS); 1311 mfrg->m_len = sizeof(struct ip6_frag); 1312 *frghdrp = mtod(mfrg, struct ip6_frag *); 1313 mlast->m_next = mfrg; 1314 } 1315 1316 return (0); 1317 } 1318 1319 static int 1320 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1321 struct route_in6 *ro_pmtu, *ro; 1322 struct ifnet *ifp; 1323 struct in6_addr *dst; 1324 u_long *mtup; 1325 int *alwaysfragp; 1326 { 1327 u_int32_t mtu = 0; 1328 int alwaysfrag = 0; 1329 int error = 0; 1330 1331 if (ro_pmtu != ro) { 1332 /* The first hop and the final destination may differ. */ 1333 struct sockaddr_in6 *sa6_dst = 1334 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1335 if (ro_pmtu->ro_rt && 1336 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1337 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1338 RTFREE(ro_pmtu->ro_rt); 1339 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1340 } 1341 if (ro_pmtu->ro_rt == NULL) { 1342 bzero(sa6_dst, sizeof(*sa6_dst)); /* for safety */ 1343 sa6_dst->sin6_family = AF_INET6; 1344 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1345 sa6_dst->sin6_addr = *dst; 1346 1347 rtalloc((struct route *)ro_pmtu); 1348 } 1349 } 1350 if (ro_pmtu->ro_rt) { 1351 u_int32_t ifmtu; 1352 1353 if (ifp == NULL) 1354 ifp = ro_pmtu->ro_rt->rt_ifp; 1355 ifmtu = IN6_LINKMTU(ifp); 1356 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1357 if (mtu == 0) 1358 mtu = ifmtu; 1359 else if (mtu < IPV6_MMTU) { 1360 /* 1361 * RFC2460 section 5, last paragraph: 1362 * if we record ICMPv6 too big message with 1363 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1364 * or smaller, with fragment header attached. 1365 * (fragment header is needed regardless from the 1366 * packet size, for translators to identify packets) 1367 */ 1368 alwaysfrag = 1; 1369 mtu = IPV6_MMTU; 1370 } else if (mtu > ifmtu) { 1371 /* 1372 * The MTU on the route is larger than the MTU on 1373 * the interface! This shouldn't happen, unless the 1374 * MTU of the interface has been changed after the 1375 * interface was brought up. Change the MTU in the 1376 * route to match the interface MTU (as long as the 1377 * field isn't locked). 1378 */ 1379 mtu = ifmtu; 1380 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1381 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1382 } 1383 } else if (ifp) { 1384 mtu = IN6_LINKMTU(ifp); 1385 } else 1386 error = EHOSTUNREACH; /* XXX */ 1387 1388 *mtup = mtu; 1389 if (alwaysfragp) 1390 *alwaysfragp = alwaysfrag; 1391 return (error); 1392 } 1393 1394 /* 1395 * IP6 socket option processing. 1396 */ 1397 int 1398 ip6_ctloutput(op, so, level, optname, mp) 1399 int op; 1400 struct socket *so; 1401 int level, optname; 1402 struct mbuf **mp; 1403 { 1404 int privileged, optdatalen, uproto; 1405 void *optdata; 1406 struct in6pcb *in6p = sotoin6pcb(so); 1407 struct mbuf *m = *mp; 1408 int error, optval; 1409 int optlen; 1410 struct proc *p = curproc; /* XXX */ 1411 1412 optlen = m ? m->m_len : 0; 1413 error = optval = 0; 1414 privileged = (p == 0 || kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) ? 0 : 1; 1415 uproto = (int)so->so_proto->pr_protocol; 1416 1417 if (level == IPPROTO_IPV6) { 1418 switch (op) { 1419 case PRCO_SETOPT: 1420 switch (optname) { 1421 #ifdef RFC2292 1422 case IPV6_2292PKTOPTIONS: 1423 /* m is freed in ip6_pcbopts */ 1424 error = ip6_pcbopts(&in6p->in6p_outputopts, 1425 m, so); 1426 break; 1427 #endif 1428 1429 /* 1430 * Use of some Hop-by-Hop options or some 1431 * Destination options, might require special 1432 * privilege. That is, normal applications 1433 * (without special privilege) might be forbidden 1434 * from setting certain options in outgoing packets, 1435 * and might never see certain options in received 1436 * packets. [RFC 2292 Section 6] 1437 * KAME specific note: 1438 * KAME prevents non-privileged users from sending or 1439 * receiving ANY hbh/dst options in order to avoid 1440 * overhead of parsing options in the kernel. 1441 */ 1442 case IPV6_RECVHOPOPTS: 1443 case IPV6_RECVDSTOPTS: 1444 case IPV6_RECVRTHDRDSTOPTS: 1445 if (!privileged) { 1446 error = EPERM; 1447 break; 1448 } 1449 /* FALLTHROUGH */ 1450 case IPV6_UNICAST_HOPS: 1451 case IPV6_HOPLIMIT: 1452 case IPV6_FAITH: 1453 1454 case IPV6_RECVPKTINFO: 1455 case IPV6_RECVHOPLIMIT: 1456 case IPV6_RECVRTHDR: 1457 case IPV6_RECVPATHMTU: 1458 case IPV6_RECVTCLASS: 1459 case IPV6_V6ONLY: 1460 if (optlen != sizeof(int)) { 1461 error = EINVAL; 1462 break; 1463 } 1464 optval = *mtod(m, int *); 1465 switch (optname) { 1466 1467 case IPV6_UNICAST_HOPS: 1468 if (optval < -1 || optval >= 256) 1469 error = EINVAL; 1470 else { 1471 /* -1 = kernel default */ 1472 in6p->in6p_hops = optval; 1473 } 1474 break; 1475 #define OPTSET(bit) \ 1476 do { \ 1477 if (optval) \ 1478 in6p->in6p_flags |= (bit); \ 1479 else \ 1480 in6p->in6p_flags &= ~(bit); \ 1481 } while (/*CONSTCOND*/ 0) 1482 1483 #ifdef RFC2292 1484 #define OPTSET2292(bit) \ 1485 do { \ 1486 in6p->in6p_flags |= IN6P_RFC2292; \ 1487 if (optval) \ 1488 in6p->in6p_flags |= (bit); \ 1489 else \ 1490 in6p->in6p_flags &= ~(bit); \ 1491 } while (/*CONSTCOND*/ 0) 1492 #endif 1493 1494 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1495 1496 case IPV6_RECVPKTINFO: 1497 #ifdef RFC2292 1498 /* cannot mix with RFC2292 */ 1499 if (OPTBIT(IN6P_RFC2292)) { 1500 error = EINVAL; 1501 break; 1502 } 1503 #endif 1504 OPTSET(IN6P_PKTINFO); 1505 break; 1506 1507 case IPV6_HOPLIMIT: 1508 { 1509 struct ip6_pktopts **optp; 1510 1511 #ifdef RFC2292 1512 /* cannot mix with RFC2292 */ 1513 if (OPTBIT(IN6P_RFC2292)) { 1514 error = EINVAL; 1515 break; 1516 } 1517 #endif 1518 optp = &in6p->in6p_outputopts; 1519 error = ip6_pcbopt(IPV6_HOPLIMIT, 1520 (u_char *)&optval, 1521 sizeof(optval), 1522 optp, 1523 privileged, uproto); 1524 break; 1525 } 1526 1527 case IPV6_RECVHOPLIMIT: 1528 #ifdef RFC2292 1529 /* cannot mix with RFC2292 */ 1530 if (OPTBIT(IN6P_RFC2292)) { 1531 error = EINVAL; 1532 break; 1533 } 1534 #endif 1535 OPTSET(IN6P_HOPLIMIT); 1536 break; 1537 1538 case IPV6_RECVHOPOPTS: 1539 #ifdef RFC2292 1540 /* cannot mix with RFC2292 */ 1541 if (OPTBIT(IN6P_RFC2292)) { 1542 error = EINVAL; 1543 break; 1544 } 1545 #endif 1546 OPTSET(IN6P_HOPOPTS); 1547 break; 1548 1549 case IPV6_RECVDSTOPTS: 1550 #ifdef RFC2292 1551 /* cannot mix with RFC2292 */ 1552 if (OPTBIT(IN6P_RFC2292)) { 1553 error = EINVAL; 1554 break; 1555 } 1556 #endif 1557 OPTSET(IN6P_DSTOPTS); 1558 break; 1559 1560 case IPV6_RECVRTHDRDSTOPTS: 1561 #ifdef RFC2292 1562 /* cannot mix with RFC2292 */ 1563 if (OPTBIT(IN6P_RFC2292)) { 1564 error = EINVAL; 1565 break; 1566 } 1567 #endif 1568 OPTSET(IN6P_RTHDRDSTOPTS); 1569 break; 1570 1571 case IPV6_RECVRTHDR: 1572 #ifdef RFC2292 1573 /* cannot mix with RFC2292 */ 1574 if (OPTBIT(IN6P_RFC2292)) { 1575 error = EINVAL; 1576 break; 1577 } 1578 #endif 1579 OPTSET(IN6P_RTHDR); 1580 break; 1581 1582 case IPV6_FAITH: 1583 OPTSET(IN6P_FAITH); 1584 break; 1585 1586 case IPV6_RECVPATHMTU: 1587 /* 1588 * We ignore this option for TCP 1589 * sockets. 1590 * (RFC3542 leaves this case 1591 * unspecified.) 1592 */ 1593 if (uproto != IPPROTO_TCP) 1594 OPTSET(IN6P_MTU); 1595 break; 1596 1597 case IPV6_V6ONLY: 1598 /* 1599 * make setsockopt(IPV6_V6ONLY) 1600 * available only prior to bind(2). 1601 * see ipng mailing list, Jun 22 2001. 1602 */ 1603 if (in6p->in6p_lport || 1604 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1605 error = EINVAL; 1606 break; 1607 } 1608 #ifdef INET6_BINDV6ONLY 1609 if (!optval) 1610 error = EINVAL; 1611 #else 1612 OPTSET(IN6P_IPV6_V6ONLY); 1613 #endif 1614 break; 1615 case IPV6_RECVTCLASS: 1616 #ifdef RFC2292 1617 /* cannot mix with RFC2292 XXX */ 1618 if (OPTBIT(IN6P_RFC2292)) { 1619 error = EINVAL; 1620 break; 1621 } 1622 #endif 1623 OPTSET(IN6P_TCLASS); 1624 break; 1625 1626 } 1627 break; 1628 1629 case IPV6_OTCLASS: 1630 { 1631 struct ip6_pktopts **optp; 1632 u_int8_t tclass; 1633 1634 if (optlen != sizeof(tclass)) { 1635 error = EINVAL; 1636 break; 1637 } 1638 tclass = *mtod(m, u_int8_t *); 1639 optp = &in6p->in6p_outputopts; 1640 error = ip6_pcbopt(optname, 1641 (u_char *)&tclass, 1642 sizeof(tclass), 1643 optp, 1644 privileged, uproto); 1645 break; 1646 } 1647 1648 case IPV6_TCLASS: 1649 case IPV6_DONTFRAG: 1650 case IPV6_USE_MIN_MTU: 1651 if (optlen != sizeof(optval)) { 1652 error = EINVAL; 1653 break; 1654 } 1655 optval = *mtod(m, int *); 1656 { 1657 struct ip6_pktopts **optp; 1658 optp = &in6p->in6p_outputopts; 1659 error = ip6_pcbopt(optname, 1660 (u_char *)&optval, 1661 sizeof(optval), 1662 optp, 1663 privileged, uproto); 1664 break; 1665 } 1666 1667 #ifdef RFC2292 1668 case IPV6_2292PKTINFO: 1669 case IPV6_2292HOPLIMIT: 1670 case IPV6_2292HOPOPTS: 1671 case IPV6_2292DSTOPTS: 1672 case IPV6_2292RTHDR: 1673 /* RFC 2292 */ 1674 if (optlen != sizeof(int)) { 1675 error = EINVAL; 1676 break; 1677 } 1678 optval = *mtod(m, int *); 1679 switch (optname) { 1680 case IPV6_2292PKTINFO: 1681 OPTSET2292(IN6P_PKTINFO); 1682 break; 1683 case IPV6_2292HOPLIMIT: 1684 OPTSET2292(IN6P_HOPLIMIT); 1685 break; 1686 case IPV6_2292HOPOPTS: 1687 /* 1688 * Check super-user privilege. 1689 * See comments for IPV6_RECVHOPOPTS. 1690 */ 1691 if (!privileged) 1692 return (EPERM); 1693 OPTSET2292(IN6P_HOPOPTS); 1694 break; 1695 case IPV6_2292DSTOPTS: 1696 if (!privileged) 1697 return (EPERM); 1698 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1699 break; 1700 case IPV6_2292RTHDR: 1701 OPTSET2292(IN6P_RTHDR); 1702 break; 1703 } 1704 break; 1705 #endif 1706 case IPV6_PKTINFO: 1707 case IPV6_HOPOPTS: 1708 case IPV6_RTHDR: 1709 case IPV6_DSTOPTS: 1710 case IPV6_RTHDRDSTOPTS: 1711 case IPV6_NEXTHOP: 1712 { 1713 /* new advanced API (RFC3542) */ 1714 u_char *optbuf; 1715 int optbuflen; 1716 struct ip6_pktopts **optp; 1717 1718 #ifdef RFC2292 1719 /* cannot mix with RFC2292 */ 1720 if (OPTBIT(IN6P_RFC2292)) { 1721 error = EINVAL; 1722 break; 1723 } 1724 #endif 1725 1726 if (m && m->m_next) { 1727 error = EINVAL; /* XXX */ 1728 break; 1729 } 1730 if (m) { 1731 optbuf = mtod(m, u_char *); 1732 optbuflen = m->m_len; 1733 } else { 1734 optbuf = NULL; 1735 optbuflen = 0; 1736 } 1737 optp = &in6p->in6p_outputopts; 1738 error = ip6_pcbopt(optname, 1739 optbuf, optbuflen, 1740 optp, privileged, uproto); 1741 break; 1742 } 1743 #undef OPTSET 1744 1745 case IPV6_MULTICAST_IF: 1746 case IPV6_MULTICAST_HOPS: 1747 case IPV6_MULTICAST_LOOP: 1748 case IPV6_JOIN_GROUP: 1749 case IPV6_LEAVE_GROUP: 1750 error = ip6_setmoptions(optname, 1751 &in6p->in6p_moptions, m); 1752 break; 1753 1754 case IPV6_PORTRANGE: 1755 optval = *mtod(m, int *); 1756 1757 switch (optval) { 1758 case IPV6_PORTRANGE_DEFAULT: 1759 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1760 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1761 break; 1762 1763 case IPV6_PORTRANGE_HIGH: 1764 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1765 in6p->in6p_flags |= IN6P_HIGHPORT; 1766 break; 1767 1768 case IPV6_PORTRANGE_LOW: 1769 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1770 in6p->in6p_flags |= IN6P_LOWPORT; 1771 break; 1772 1773 default: 1774 error = EINVAL; 1775 break; 1776 } 1777 break; 1778 1779 #ifdef IPSEC 1780 case IPV6_IPSEC_POLICY: 1781 { 1782 caddr_t req = NULL; 1783 size_t len = 0; 1784 if (m) { 1785 req = mtod(m, caddr_t); 1786 len = m->m_len; 1787 } 1788 error = ipsec6_set_policy(in6p, optname, req, 1789 len, privileged); 1790 } 1791 break; 1792 #endif /* IPSEC */ 1793 1794 default: 1795 error = ENOPROTOOPT; 1796 break; 1797 } 1798 if (m) 1799 (void)m_free(m); 1800 break; 1801 1802 case PRCO_GETOPT: 1803 switch (optname) { 1804 #ifdef RFC2292 1805 case IPV6_2292PKTOPTIONS: 1806 /* 1807 * RFC3542 (effectively) deprecated the 1808 * semantics of the 2292-style pktoptions. 1809 * Since it was not reliable in nature (i.e., 1810 * applications had to expect the lack of some 1811 * information after all), it would make sense 1812 * to simplify this part by always returning 1813 * empty data. 1814 */ 1815 *mp = m_get(M_WAIT, MT_SOOPTS); 1816 (*mp)->m_len = 0; 1817 break; 1818 #endif 1819 1820 case IPV6_RECVHOPOPTS: 1821 case IPV6_RECVDSTOPTS: 1822 case IPV6_RECVRTHDRDSTOPTS: 1823 case IPV6_UNICAST_HOPS: 1824 case IPV6_RECVPKTINFO: 1825 case IPV6_RECVHOPLIMIT: 1826 case IPV6_RECVRTHDR: 1827 case IPV6_RECVPATHMTU: 1828 1829 case IPV6_FAITH: 1830 case IPV6_V6ONLY: 1831 case IPV6_PORTRANGE: 1832 case IPV6_RECVTCLASS: 1833 switch (optname) { 1834 1835 case IPV6_RECVHOPOPTS: 1836 optval = OPTBIT(IN6P_HOPOPTS); 1837 break; 1838 1839 case IPV6_RECVDSTOPTS: 1840 optval = OPTBIT(IN6P_DSTOPTS); 1841 break; 1842 1843 case IPV6_RECVRTHDRDSTOPTS: 1844 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1845 break; 1846 1847 case IPV6_UNICAST_HOPS: 1848 optval = in6p->in6p_hops; 1849 break; 1850 1851 case IPV6_RECVPKTINFO: 1852 optval = OPTBIT(IN6P_PKTINFO); 1853 break; 1854 1855 case IPV6_RECVHOPLIMIT: 1856 optval = OPTBIT(IN6P_HOPLIMIT); 1857 break; 1858 1859 case IPV6_RECVRTHDR: 1860 optval = OPTBIT(IN6P_RTHDR); 1861 break; 1862 1863 case IPV6_RECVPATHMTU: 1864 optval = OPTBIT(IN6P_MTU); 1865 break; 1866 1867 case IPV6_FAITH: 1868 optval = OPTBIT(IN6P_FAITH); 1869 break; 1870 1871 case IPV6_V6ONLY: 1872 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1873 break; 1874 1875 case IPV6_PORTRANGE: 1876 { 1877 int flags; 1878 flags = in6p->in6p_flags; 1879 if (flags & IN6P_HIGHPORT) 1880 optval = IPV6_PORTRANGE_HIGH; 1881 else if (flags & IN6P_LOWPORT) 1882 optval = IPV6_PORTRANGE_LOW; 1883 else 1884 optval = 0; 1885 break; 1886 } 1887 case IPV6_RECVTCLASS: 1888 optval = OPTBIT(IN6P_TCLASS); 1889 break; 1890 1891 } 1892 if (error) 1893 break; 1894 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1895 m->m_len = sizeof(int); 1896 *mtod(m, int *) = optval; 1897 break; 1898 1899 case IPV6_PATHMTU: 1900 { 1901 u_long pmtu = 0; 1902 struct ip6_mtuinfo mtuinfo; 1903 struct route_in6 *ro = (struct route_in6 *)&in6p 1904 ->in6p_route; 1905 1906 if (!(so->so_state & SS_ISCONNECTED)) 1907 return (ENOTCONN); 1908 /* 1909 * XXX: we dot not consider the case of source 1910 * routing, or optional information to specify 1911 * the outgoing interface. 1912 */ 1913 error = ip6_getpmtu(ro, NULL, NULL, 1914 &in6p->in6p_faddr, &pmtu, NULL); 1915 if (error) 1916 break; 1917 if (pmtu > IPV6_MAXPACKET) 1918 pmtu = IPV6_MAXPACKET; 1919 1920 memset(&mtuinfo, 0, sizeof(mtuinfo)); 1921 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 1922 optdata = (void *)&mtuinfo; 1923 optdatalen = sizeof(mtuinfo); 1924 if (optdatalen > MCLBYTES) 1925 return (EMSGSIZE); /* XXX */ 1926 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1927 if (optdatalen > MLEN) 1928 MCLGET(m, M_WAIT); 1929 m->m_len = optdatalen; 1930 memcpy(mtod(m, void *), optdata, optdatalen); 1931 break; 1932 } 1933 1934 #ifdef RFC2292 1935 case IPV6_2292PKTINFO: 1936 case IPV6_2292HOPLIMIT: 1937 case IPV6_2292HOPOPTS: 1938 case IPV6_2292RTHDR: 1939 case IPV6_2292DSTOPTS: 1940 switch (optname) { 1941 case IPV6_2292PKTINFO: 1942 optval = OPTBIT(IN6P_PKTINFO); 1943 break; 1944 case IPV6_2292HOPLIMIT: 1945 optval = OPTBIT(IN6P_HOPLIMIT); 1946 break; 1947 case IPV6_2292HOPOPTS: 1948 optval = OPTBIT(IN6P_HOPOPTS); 1949 break; 1950 case IPV6_2292RTHDR: 1951 optval = OPTBIT(IN6P_RTHDR); 1952 break; 1953 case IPV6_2292DSTOPTS: 1954 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1955 break; 1956 } 1957 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1958 m->m_len = sizeof(int); 1959 *mtod(m, int *) = optval; 1960 break; 1961 #endif 1962 case IPV6_PKTINFO: 1963 case IPV6_HOPOPTS: 1964 case IPV6_RTHDR: 1965 case IPV6_DSTOPTS: 1966 case IPV6_RTHDRDSTOPTS: 1967 case IPV6_NEXTHOP: 1968 case IPV6_OTCLASS: 1969 case IPV6_TCLASS: 1970 case IPV6_DONTFRAG: 1971 case IPV6_USE_MIN_MTU: 1972 error = ip6_getpcbopt(in6p->in6p_outputopts, 1973 optname, mp); 1974 break; 1975 1976 case IPV6_MULTICAST_IF: 1977 case IPV6_MULTICAST_HOPS: 1978 case IPV6_MULTICAST_LOOP: 1979 case IPV6_JOIN_GROUP: 1980 case IPV6_LEAVE_GROUP: 1981 error = ip6_getmoptions(optname, 1982 in6p->in6p_moptions, mp); 1983 break; 1984 1985 #ifdef IPSEC 1986 case IPV6_IPSEC_POLICY: 1987 { 1988 caddr_t req = NULL; 1989 size_t len = 0; 1990 if (m) { 1991 req = mtod(m, caddr_t); 1992 len = m->m_len; 1993 } 1994 error = ipsec6_get_policy(in6p, req, len, mp); 1995 break; 1996 } 1997 #endif /* IPSEC */ 1998 1999 2000 2001 2002 default: 2003 error = ENOPROTOOPT; 2004 break; 2005 } 2006 break; 2007 } 2008 } else { 2009 error = EINVAL; 2010 if (op == PRCO_SETOPT && *mp) 2011 (void)m_free(*mp); 2012 } 2013 return (error); 2014 } 2015 2016 int 2017 ip6_raw_ctloutput(op, so, level, optname, mp) 2018 int op; 2019 struct socket *so; 2020 int level, optname; 2021 struct mbuf **mp; 2022 { 2023 int error = 0, optval, optlen; 2024 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2025 struct in6pcb *in6p = sotoin6pcb(so); 2026 struct mbuf *m = *mp; 2027 2028 optlen = m ? m->m_len : 0; 2029 2030 if (level != IPPROTO_IPV6) { 2031 if (op == PRCO_SETOPT && *mp) 2032 (void)m_free(*mp); 2033 return (EINVAL); 2034 } 2035 2036 switch (optname) { 2037 case IPV6_CHECKSUM: 2038 /* 2039 * For ICMPv6 sockets, no modification allowed for checksum 2040 * offset, permit "no change" values to help existing apps. 2041 * 2042 * XXX RFC3542 says: "An attempt to set IPV6_CHECKSUM 2043 * for an ICMPv6 socket will fail." The current 2044 * behavior does not meet RFC3542. 2045 */ 2046 switch (op) { 2047 case PRCO_SETOPT: 2048 if (optlen != sizeof(int)) { 2049 error = EINVAL; 2050 break; 2051 } 2052 optval = *mtod(m, int *); 2053 if ((optval % 2) != 0) { 2054 /* the API assumes even offset values */ 2055 error = EINVAL; 2056 } else if (so->so_proto->pr_protocol == 2057 IPPROTO_ICMPV6) { 2058 if (optval != icmp6off) 2059 error = EINVAL; 2060 } else 2061 in6p->in6p_cksum = optval; 2062 break; 2063 2064 case PRCO_GETOPT: 2065 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2066 optval = icmp6off; 2067 else 2068 optval = in6p->in6p_cksum; 2069 2070 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2071 m->m_len = sizeof(int); 2072 *mtod(m, int *) = optval; 2073 break; 2074 2075 default: 2076 error = EINVAL; 2077 break; 2078 } 2079 break; 2080 2081 default: 2082 error = ENOPROTOOPT; 2083 break; 2084 } 2085 2086 if (op == PRCO_SETOPT && m) 2087 (void)m_free(m); 2088 2089 return (error); 2090 } 2091 2092 #ifdef RFC2292 2093 /* 2094 * Set up IP6 options in pcb for insertion in output packets or 2095 * specifying behavior of outgoing packets. 2096 */ 2097 static int 2098 ip6_pcbopts(pktopt, m, so) 2099 struct ip6_pktopts **pktopt; 2100 struct mbuf *m; 2101 struct socket *so; 2102 { 2103 struct ip6_pktopts *opt = *pktopt; 2104 int error = 0; 2105 struct proc *p = curproc; /* XXX */ 2106 int priv = 0; 2107 2108 /* turn off any old options. */ 2109 if (opt) { 2110 #ifdef DIAGNOSTIC 2111 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2112 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2113 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2114 printf("ip6_pcbopts: all specified options are cleared.\n"); 2115 #endif 2116 ip6_clearpktopts(opt, -1); 2117 } else 2118 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2119 *pktopt = NULL; 2120 2121 if (!m || m->m_len == 0) { 2122 /* 2123 * Only turning off any previous options, regardless of 2124 * whether the opt is just created or given. 2125 */ 2126 free(opt, M_IP6OPT); 2127 return (0); 2128 } 2129 2130 /* set options specified by user. */ 2131 if (p && !kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) 2132 priv = 1; 2133 if ((error = ip6_setpktopts(m, opt, NULL, priv, 2134 so->so_proto->pr_protocol)) != 0) { 2135 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2136 free(opt, M_IP6OPT); 2137 return (error); 2138 } 2139 *pktopt = opt; 2140 return (0); 2141 } 2142 #endif 2143 2144 /* 2145 * initialize ip6_pktopts. beware that there are non-zero default values in 2146 * the struct. 2147 */ 2148 void 2149 ip6_initpktopts(struct ip6_pktopts *opt) 2150 { 2151 2152 memset(opt, 0, sizeof(*opt)); 2153 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2154 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2155 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2156 } 2157 2158 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* XXX */ 2159 static int 2160 ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, 2161 int priv, int uproto) 2162 { 2163 struct ip6_pktopts *opt; 2164 2165 if (*pktopt == NULL) { 2166 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2167 M_WAITOK); 2168 ip6_initpktopts(*pktopt); 2169 } 2170 opt = *pktopt; 2171 2172 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2173 } 2174 2175 static int 2176 ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct mbuf **mp) 2177 { 2178 void *optdata = NULL; 2179 int optdatalen = 0; 2180 struct ip6_ext *ip6e; 2181 int error = 0; 2182 struct in6_pktinfo null_pktinfo; 2183 int deftclass = 0, on; 2184 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2185 struct mbuf *m; 2186 2187 switch (optname) { 2188 case IPV6_PKTINFO: 2189 if (pktopt && pktopt->ip6po_pktinfo) 2190 optdata = (void *)pktopt->ip6po_pktinfo; 2191 else { 2192 /* XXX: we don't have to do this every time... */ 2193 memset(&null_pktinfo, 0, sizeof(null_pktinfo)); 2194 optdata = (void *)&null_pktinfo; 2195 } 2196 optdatalen = sizeof(struct in6_pktinfo); 2197 break; 2198 case IPV6_OTCLASS: 2199 /* XXX */ 2200 return (EINVAL); 2201 case IPV6_TCLASS: 2202 if (pktopt && pktopt->ip6po_tclass >= 0) 2203 optdata = (void *)&pktopt->ip6po_tclass; 2204 else 2205 optdata = (void *)&deftclass; 2206 optdatalen = sizeof(int); 2207 break; 2208 case IPV6_HOPOPTS: 2209 if (pktopt && pktopt->ip6po_hbh) { 2210 optdata = (void *)pktopt->ip6po_hbh; 2211 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2212 optdatalen = (ip6e->ip6e_len + 1) << 3; 2213 } 2214 break; 2215 case IPV6_RTHDR: 2216 if (pktopt && pktopt->ip6po_rthdr) { 2217 optdata = (void *)pktopt->ip6po_rthdr; 2218 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2219 optdatalen = (ip6e->ip6e_len + 1) << 3; 2220 } 2221 break; 2222 case IPV6_RTHDRDSTOPTS: 2223 if (pktopt && pktopt->ip6po_dest1) { 2224 optdata = (void *)pktopt->ip6po_dest1; 2225 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2226 optdatalen = (ip6e->ip6e_len + 1) << 3; 2227 } 2228 break; 2229 case IPV6_DSTOPTS: 2230 if (pktopt && pktopt->ip6po_dest2) { 2231 optdata = (void *)pktopt->ip6po_dest2; 2232 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2233 optdatalen = (ip6e->ip6e_len + 1) << 3; 2234 } 2235 break; 2236 case IPV6_NEXTHOP: 2237 if (pktopt && pktopt->ip6po_nexthop) { 2238 optdata = (void *)pktopt->ip6po_nexthop; 2239 optdatalen = pktopt->ip6po_nexthop->sa_len; 2240 } 2241 break; 2242 case IPV6_USE_MIN_MTU: 2243 if (pktopt) 2244 optdata = (void *)&pktopt->ip6po_minmtu; 2245 else 2246 optdata = (void *)&defminmtu; 2247 optdatalen = sizeof(int); 2248 break; 2249 case IPV6_DONTFRAG: 2250 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2251 on = 1; 2252 else 2253 on = 0; 2254 optdata = (void *)&on; 2255 optdatalen = sizeof(on); 2256 break; 2257 default: /* should not happen */ 2258 #ifdef DIAGNOSTIC 2259 panic("ip6_getpcbopt: unexpected option\n"); 2260 #endif 2261 return (ENOPROTOOPT); 2262 } 2263 2264 if (optdatalen > MCLBYTES) 2265 return (EMSGSIZE); /* XXX */ 2266 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2267 if (optdatalen > MLEN) 2268 MCLGET(m, M_WAIT); 2269 m->m_len = optdatalen; 2270 if (optdatalen) 2271 memcpy(mtod(m, void *), optdata, optdatalen); 2272 2273 return (error); 2274 } 2275 2276 void 2277 ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) 2278 { 2279 if (optname == -1 || optname == IPV6_PKTINFO) { 2280 if (pktopt->ip6po_pktinfo) 2281 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2282 pktopt->ip6po_pktinfo = NULL; 2283 } 2284 if (optname == -1 || optname == IPV6_HOPLIMIT) 2285 pktopt->ip6po_hlim = -1; 2286 if (optname == -1 || optname == IPV6_TCLASS) 2287 pktopt->ip6po_tclass = -1; 2288 if (optname == -1 || optname == IPV6_NEXTHOP) { 2289 if (pktopt->ip6po_nextroute.ro_rt) { 2290 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2291 pktopt->ip6po_nextroute.ro_rt = NULL; 2292 } 2293 if (pktopt->ip6po_nexthop) 2294 free(pktopt->ip6po_nexthop, M_IP6OPT); 2295 pktopt->ip6po_nexthop = NULL; 2296 } 2297 if (optname == -1 || optname == IPV6_HOPOPTS) { 2298 if (pktopt->ip6po_hbh) 2299 free(pktopt->ip6po_hbh, M_IP6OPT); 2300 pktopt->ip6po_hbh = NULL; 2301 } 2302 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2303 if (pktopt->ip6po_dest1) 2304 free(pktopt->ip6po_dest1, M_IP6OPT); 2305 pktopt->ip6po_dest1 = NULL; 2306 } 2307 if (optname == -1 || optname == IPV6_RTHDR) { 2308 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2309 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2310 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2311 if (pktopt->ip6po_route.ro_rt) { 2312 RTFREE(pktopt->ip6po_route.ro_rt); 2313 pktopt->ip6po_route.ro_rt = NULL; 2314 } 2315 } 2316 if (optname == -1 || optname == IPV6_DSTOPTS) { 2317 if (pktopt->ip6po_dest2) 2318 free(pktopt->ip6po_dest2, M_IP6OPT); 2319 pktopt->ip6po_dest2 = NULL; 2320 } 2321 } 2322 2323 #define PKTOPT_EXTHDRCPY(type) \ 2324 do { \ 2325 if (src->type) { \ 2326 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2327 dst->type = malloc(hlen, M_IP6OPT, canwait); \ 2328 if (dst->type == NULL && canwait == M_NOWAIT) \ 2329 goto bad; \ 2330 memcpy(dst->type, src->type, hlen); \ 2331 } \ 2332 } while (/*CONSTCOND*/ 0) 2333 2334 static int 2335 copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) 2336 { 2337 dst->ip6po_hlim = src->ip6po_hlim; 2338 dst->ip6po_tclass = src->ip6po_tclass; 2339 dst->ip6po_flags = src->ip6po_flags; 2340 if (src->ip6po_pktinfo) { 2341 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2342 M_IP6OPT, canwait); 2343 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2344 goto bad; 2345 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2346 } 2347 if (src->ip6po_nexthop) { 2348 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2349 M_IP6OPT, canwait); 2350 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 2351 goto bad; 2352 memcpy(dst->ip6po_nexthop, src->ip6po_nexthop, 2353 src->ip6po_nexthop->sa_len); 2354 } 2355 PKTOPT_EXTHDRCPY(ip6po_hbh); 2356 PKTOPT_EXTHDRCPY(ip6po_dest1); 2357 PKTOPT_EXTHDRCPY(ip6po_dest2); 2358 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2359 return (0); 2360 2361 bad: 2362 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2363 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2364 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2365 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2366 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2367 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2368 2369 return (ENOBUFS); 2370 } 2371 #undef PKTOPT_EXTHDRCPY 2372 2373 struct ip6_pktopts * 2374 ip6_copypktopts(struct ip6_pktopts *src, int canwait) 2375 { 2376 int error; 2377 struct ip6_pktopts *dst; 2378 2379 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2380 if (dst == NULL && canwait == M_NOWAIT) 2381 return (NULL); 2382 ip6_initpktopts(dst); 2383 2384 if ((error = copypktopts(dst, src, canwait)) != 0) { 2385 free(dst, M_IP6OPT); 2386 return (NULL); 2387 } 2388 2389 return (dst); 2390 } 2391 2392 void 2393 ip6_freepcbopts(struct ip6_pktopts *pktopt) 2394 { 2395 if (pktopt == NULL) 2396 return; 2397 2398 ip6_clearpktopts(pktopt, -1); 2399 2400 free(pktopt, M_IP6OPT); 2401 } 2402 2403 /* 2404 * Set the IP6 multicast options in response to user setsockopt(). 2405 */ 2406 static int 2407 ip6_setmoptions(optname, im6op, m) 2408 int optname; 2409 struct ip6_moptions **im6op; 2410 struct mbuf *m; 2411 { 2412 int error = 0; 2413 u_int loop, ifindex; 2414 struct ipv6_mreq *mreq; 2415 struct ifnet *ifp; 2416 struct ip6_moptions *im6o = *im6op; 2417 struct route_in6 ro; 2418 struct in6_multi_mship *imm; 2419 struct proc *p = curproc; /* XXX */ 2420 2421 if (im6o == NULL) { 2422 /* 2423 * No multicast option buffer attached to the pcb; 2424 * allocate one and initialize to default values. 2425 */ 2426 im6o = (struct ip6_moptions *) 2427 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2428 2429 if (im6o == NULL) 2430 return (ENOBUFS); 2431 *im6op = im6o; 2432 im6o->im6o_multicast_ifp = NULL; 2433 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2434 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2435 LIST_INIT(&im6o->im6o_memberships); 2436 } 2437 2438 switch (optname) { 2439 2440 case IPV6_MULTICAST_IF: 2441 /* 2442 * Select the interface for outgoing multicast packets. 2443 */ 2444 if (m == NULL || m->m_len != sizeof(u_int)) { 2445 error = EINVAL; 2446 break; 2447 } 2448 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2449 if (ifindex != 0) { 2450 if (ifindex < 0 || if_indexlim <= ifindex || 2451 !ifindex2ifnet[ifindex]) { 2452 error = ENXIO; /* XXX EINVAL? */ 2453 break; 2454 } 2455 ifp = ifindex2ifnet[ifindex]; 2456 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 2457 error = EADDRNOTAVAIL; 2458 break; 2459 } 2460 } else 2461 ifp = NULL; 2462 im6o->im6o_multicast_ifp = ifp; 2463 break; 2464 2465 case IPV6_MULTICAST_HOPS: 2466 { 2467 /* 2468 * Set the IP6 hoplimit for outgoing multicast packets. 2469 */ 2470 int optval; 2471 if (m == NULL || m->m_len != sizeof(int)) { 2472 error = EINVAL; 2473 break; 2474 } 2475 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2476 if (optval < -1 || optval >= 256) 2477 error = EINVAL; 2478 else if (optval == -1) 2479 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2480 else 2481 im6o->im6o_multicast_hlim = optval; 2482 break; 2483 } 2484 2485 case IPV6_MULTICAST_LOOP: 2486 /* 2487 * Set the loopback flag for outgoing multicast packets. 2488 * Must be zero or one. 2489 */ 2490 if (m == NULL || m->m_len != sizeof(u_int)) { 2491 error = EINVAL; 2492 break; 2493 } 2494 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2495 if (loop > 1) { 2496 error = EINVAL; 2497 break; 2498 } 2499 im6o->im6o_multicast_loop = loop; 2500 break; 2501 2502 case IPV6_JOIN_GROUP: 2503 /* 2504 * Add a multicast group membership. 2505 * Group must be a valid IP6 multicast address. 2506 */ 2507 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2508 error = EINVAL; 2509 break; 2510 } 2511 mreq = mtod(m, struct ipv6_mreq *); 2512 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2513 /* 2514 * We use the unspecified address to specify to accept 2515 * all multicast addresses. Only super user is allowed 2516 * to do this. 2517 */ 2518 if (kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) 2519 { 2520 error = EACCES; 2521 break; 2522 } 2523 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2524 error = EINVAL; 2525 break; 2526 } 2527 2528 /* 2529 * If no interface was explicitly specified, choose an 2530 * appropriate one according to the given multicast address. 2531 */ 2532 if (mreq->ipv6mr_interface == 0) { 2533 struct sockaddr_in6 *dst; 2534 2535 /* 2536 * Look up the routing table for the 2537 * address, and choose the outgoing interface. 2538 * XXX: is it a good approach? 2539 */ 2540 ro.ro_rt = NULL; 2541 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2542 bzero(dst, sizeof(*dst)); 2543 dst->sin6_family = AF_INET6; 2544 dst->sin6_len = sizeof(*dst); 2545 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2546 rtalloc((struct route *)&ro); 2547 if (ro.ro_rt == NULL) { 2548 error = EADDRNOTAVAIL; 2549 break; 2550 } 2551 ifp = ro.ro_rt->rt_ifp; 2552 rtfree(ro.ro_rt); 2553 } else { 2554 /* 2555 * If the interface is specified, validate it. 2556 */ 2557 if (mreq->ipv6mr_interface < 0 || 2558 if_indexlim <= mreq->ipv6mr_interface || 2559 !ifindex2ifnet[mreq->ipv6mr_interface]) { 2560 error = ENXIO; /* XXX EINVAL? */ 2561 break; 2562 } 2563 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2564 } 2565 2566 /* 2567 * See if we found an interface, and confirm that it 2568 * supports multicast 2569 */ 2570 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2571 error = EADDRNOTAVAIL; 2572 break; 2573 } 2574 2575 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2576 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2577 break; 2578 } 2579 2580 /* 2581 * See if the membership already exists. 2582 */ 2583 for (imm = im6o->im6o_memberships.lh_first; 2584 imm != NULL; imm = imm->i6mm_chain.le_next) 2585 if (imm->i6mm_maddr->in6m_ifp == ifp && 2586 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2587 &mreq->ipv6mr_multiaddr)) 2588 break; 2589 if (imm != NULL) { 2590 error = EADDRINUSE; 2591 break; 2592 } 2593 /* 2594 * Everything looks good; add a new record to the multicast 2595 * address list for the given interface. 2596 */ 2597 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error, 0); 2598 if (imm == NULL) 2599 break; 2600 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2601 break; 2602 2603 case IPV6_LEAVE_GROUP: 2604 /* 2605 * Drop a multicast group membership. 2606 * Group must be a valid IP6 multicast address. 2607 */ 2608 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2609 error = EINVAL; 2610 break; 2611 } 2612 mreq = mtod(m, struct ipv6_mreq *); 2613 2614 /* 2615 * If an interface address was specified, get a pointer 2616 * to its ifnet structure. 2617 */ 2618 if (mreq->ipv6mr_interface != 0) { 2619 if (mreq->ipv6mr_interface < 0 || 2620 if_indexlim <= mreq->ipv6mr_interface || 2621 !ifindex2ifnet[mreq->ipv6mr_interface]) { 2622 error = ENXIO; /* XXX EINVAL? */ 2623 break; 2624 } 2625 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2626 } else 2627 ifp = NULL; 2628 2629 /* Fill in the scope zone ID */ 2630 if (ifp) { 2631 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2632 /* XXX: should not happen */ 2633 error = EADDRNOTAVAIL; 2634 break; 2635 } 2636 } else if (mreq->ipv6mr_interface != 0) { 2637 /* 2638 * XXX: This case would happens when the (positive) 2639 * index is in the valid range, but the corresponding 2640 * interface has been detached dynamically. The above 2641 * check probably avoids such case to happen here, but 2642 * we check it explicitly for safety. 2643 */ 2644 error = EADDRNOTAVAIL; 2645 break; 2646 } else { /* ipv6mr_interface == 0 */ 2647 struct sockaddr_in6 sa6_mc; 2648 2649 /* 2650 * The API spec says as follows: 2651 * If the interface index is specified as 0, the 2652 * system may choose a multicast group membership to 2653 * drop by matching the multicast address only. 2654 * On the other hand, we cannot disambiguate the scope 2655 * zone unless an interface is provided. Thus, we 2656 * check if there's ambiguity with the default scope 2657 * zone as the last resort. 2658 */ 2659 bzero(&sa6_mc, sizeof(sa6_mc)); 2660 sa6_mc.sin6_family = AF_INET6; 2661 sa6_mc.sin6_len = sizeof(sa6_mc); 2662 sa6_mc.sin6_addr = mreq->ipv6mr_multiaddr; 2663 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2664 if (error != 0) 2665 break; 2666 mreq->ipv6mr_multiaddr = sa6_mc.sin6_addr; 2667 } 2668 2669 /* 2670 * Find the membership in the membership list. 2671 */ 2672 for (imm = im6o->im6o_memberships.lh_first; 2673 imm != NULL; imm = imm->i6mm_chain.le_next) { 2674 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2675 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2676 &mreq->ipv6mr_multiaddr)) 2677 break; 2678 } 2679 if (imm == NULL) { 2680 /* Unable to resolve interface */ 2681 error = EADDRNOTAVAIL; 2682 break; 2683 } 2684 /* 2685 * Give up the multicast address record to which the 2686 * membership points. 2687 */ 2688 LIST_REMOVE(imm, i6mm_chain); 2689 in6_leavegroup(imm); 2690 break; 2691 2692 default: 2693 error = EOPNOTSUPP; 2694 break; 2695 } 2696 2697 /* 2698 * If all options have default values, no need to keep the mbuf. 2699 */ 2700 if (im6o->im6o_multicast_ifp == NULL && 2701 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2702 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2703 im6o->im6o_memberships.lh_first == NULL) { 2704 free(*im6op, M_IPMOPTS); 2705 *im6op = NULL; 2706 } 2707 2708 return (error); 2709 } 2710 2711 /* 2712 * Return the IP6 multicast options in response to user getsockopt(). 2713 */ 2714 static int 2715 ip6_getmoptions(optname, im6o, mp) 2716 int optname; 2717 struct ip6_moptions *im6o; 2718 struct mbuf **mp; 2719 { 2720 u_int *hlim, *loop, *ifindex; 2721 2722 *mp = m_get(M_WAIT, MT_SOOPTS); 2723 2724 switch (optname) { 2725 2726 case IPV6_MULTICAST_IF: 2727 ifindex = mtod(*mp, u_int *); 2728 (*mp)->m_len = sizeof(u_int); 2729 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2730 *ifindex = 0; 2731 else 2732 *ifindex = im6o->im6o_multicast_ifp->if_index; 2733 return (0); 2734 2735 case IPV6_MULTICAST_HOPS: 2736 hlim = mtod(*mp, u_int *); 2737 (*mp)->m_len = sizeof(u_int); 2738 if (im6o == NULL) 2739 *hlim = ip6_defmcasthlim; 2740 else 2741 *hlim = im6o->im6o_multicast_hlim; 2742 return (0); 2743 2744 case IPV6_MULTICAST_LOOP: 2745 loop = mtod(*mp, u_int *); 2746 (*mp)->m_len = sizeof(u_int); 2747 if (im6o == NULL) 2748 *loop = ip6_defmcasthlim; 2749 else 2750 *loop = im6o->im6o_multicast_loop; 2751 return (0); 2752 2753 default: 2754 return (EOPNOTSUPP); 2755 } 2756 } 2757 2758 /* 2759 * Discard the IP6 multicast options. 2760 */ 2761 void 2762 ip6_freemoptions(im6o) 2763 struct ip6_moptions *im6o; 2764 { 2765 struct in6_multi_mship *imm; 2766 2767 if (im6o == NULL) 2768 return; 2769 2770 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2771 LIST_REMOVE(imm, i6mm_chain); 2772 in6_leavegroup(imm); 2773 } 2774 free(im6o, M_IPMOPTS); 2775 } 2776 2777 /* 2778 * Set IPv6 outgoing packet options based on advanced API. 2779 */ 2780 int 2781 ip6_setpktopts(control, opt, stickyopt, priv, uproto) 2782 struct mbuf *control; 2783 struct ip6_pktopts *opt, *stickyopt; 2784 int priv, uproto; 2785 { 2786 struct cmsghdr *cm = 0; 2787 2788 if (control == NULL || opt == NULL) 2789 return (EINVAL); 2790 2791 ip6_initpktopts(opt); 2792 if (stickyopt) { 2793 int error; 2794 2795 /* 2796 * If stickyopt is provided, make a local copy of the options 2797 * for this particular packet, then override them by ancillary 2798 * objects. 2799 * XXX: copypktopts() does not copy the cached route to a next 2800 * hop (if any). This is not very good in terms of efficiency, 2801 * but we can allow this since this option should be rarely 2802 * used. 2803 */ 2804 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2805 return (error); 2806 } 2807 2808 /* 2809 * XXX: Currently, we assume all the optional information is stored 2810 * in a single mbuf. 2811 */ 2812 if (control->m_next) 2813 return (EINVAL); 2814 2815 for (; control->m_len; 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 pktinfo->ipi6_ifindex < 0) { 2928 return (ENXIO); 2929 } 2930 if (pktinfo->ipi6_ifindex) { 2931 ifp = ifindex2ifnet[pktinfo->ipi6_ifindex]; 2932 if (ifp == NULL) 2933 return (ENXIO); 2934 } 2935 2936 /* 2937 * We store the address anyway, and let in6_selectsrc() 2938 * validate the specified address. This is because ipi6_addr 2939 * may not have enough information about its scope zone, and 2940 * we may need additional information (such as outgoing 2941 * interface or the scope zone of a destination address) to 2942 * disambiguate the scope. 2943 * XXX: the delay of the validation may confuse the 2944 * application when it is used as a sticky option. 2945 */ 2946 if (opt->ip6po_pktinfo == NULL) { 2947 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 2948 M_IP6OPT, M_NOWAIT); 2949 if (opt->ip6po_pktinfo == NULL) 2950 return (ENOBUFS); 2951 } 2952 memcpy(opt->ip6po_pktinfo, pktinfo, sizeof(*pktinfo)); 2953 break; 2954 } 2955 2956 #ifdef RFC2292 2957 case IPV6_2292HOPLIMIT: 2958 #endif 2959 case IPV6_HOPLIMIT: 2960 { 2961 int *hlimp; 2962 2963 /* 2964 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 2965 * to simplify the ordering among hoplimit options. 2966 */ 2967 if (optname == IPV6_HOPLIMIT && sticky) 2968 return (ENOPROTOOPT); 2969 2970 if (len != sizeof(int)) 2971 return (EINVAL); 2972 hlimp = (int *)buf; 2973 if (*hlimp < -1 || *hlimp > 255) 2974 return (EINVAL); 2975 2976 opt->ip6po_hlim = *hlimp; 2977 break; 2978 } 2979 2980 case IPV6_OTCLASS: 2981 if (len != sizeof(u_int8_t)) 2982 return (EINVAL); 2983 2984 opt->ip6po_tclass = *(u_int8_t *)buf; 2985 break; 2986 2987 case IPV6_TCLASS: 2988 { 2989 int tclass; 2990 2991 if (len != sizeof(int)) 2992 return (EINVAL); 2993 tclass = *(int *)buf; 2994 if (tclass < -1 || tclass > 255) 2995 return (EINVAL); 2996 2997 opt->ip6po_tclass = tclass; 2998 break; 2999 } 3000 3001 #ifdef RFC2292 3002 case IPV6_2292NEXTHOP: 3003 #endif 3004 case IPV6_NEXTHOP: 3005 if (!priv) 3006 return (EPERM); 3007 3008 if (len == 0) { /* just remove the option */ 3009 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3010 break; 3011 } 3012 3013 /* check if cmsg_len is large enough for sa_len */ 3014 if (len < sizeof(struct sockaddr) || len < *buf) 3015 return (EINVAL); 3016 3017 switch (((struct sockaddr *)buf)->sa_family) { 3018 case AF_INET6: 3019 { 3020 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3021 int error; 3022 3023 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3024 return (EINVAL); 3025 3026 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3027 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3028 return (EINVAL); 3029 } 3030 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3031 != 0) { 3032 return (error); 3033 } 3034 break; 3035 } 3036 case AF_LINK: /* eventually be supported? */ 3037 default: 3038 return (EAFNOSUPPORT); 3039 } 3040 3041 /* turn off the previous option, then set the new option. */ 3042 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3043 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3044 if (opt->ip6po_nexthop == NULL) 3045 return (ENOBUFS); 3046 memcpy(opt->ip6po_nexthop, buf, *buf); 3047 break; 3048 3049 #ifdef RFC2292 3050 case IPV6_2292HOPOPTS: 3051 #endif 3052 case IPV6_HOPOPTS: 3053 { 3054 struct ip6_hbh *hbh; 3055 int hbhlen; 3056 3057 /* 3058 * XXX: We don't allow a non-privileged user to set ANY HbH 3059 * options, since per-option restriction has too much 3060 * overhead. 3061 */ 3062 if (!priv) 3063 return (EPERM); 3064 3065 if (len == 0) { 3066 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3067 break; /* just remove the option */ 3068 } 3069 3070 /* message length validation */ 3071 if (len < sizeof(struct ip6_hbh)) 3072 return (EINVAL); 3073 hbh = (struct ip6_hbh *)buf; 3074 hbhlen = (hbh->ip6h_len + 1) << 3; 3075 if (len != hbhlen) 3076 return (EINVAL); 3077 3078 /* turn off the previous option, then set the new option. */ 3079 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3080 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3081 if (opt->ip6po_hbh == NULL) 3082 return (ENOBUFS); 3083 memcpy(opt->ip6po_hbh, hbh, hbhlen); 3084 3085 break; 3086 } 3087 3088 #ifdef RFC2292 3089 case IPV6_2292DSTOPTS: 3090 #endif 3091 case IPV6_DSTOPTS: 3092 case IPV6_RTHDRDSTOPTS: 3093 { 3094 struct ip6_dest *dest, **newdest = NULL; 3095 int destlen; 3096 3097 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3098 return (EPERM); 3099 3100 if (len == 0) { 3101 ip6_clearpktopts(opt, optname); 3102 break; /* just remove the option */ 3103 } 3104 3105 /* message length validation */ 3106 if (len < sizeof(struct ip6_dest)) 3107 return (EINVAL); 3108 dest = (struct ip6_dest *)buf; 3109 destlen = (dest->ip6d_len + 1) << 3; 3110 if (len != destlen) 3111 return (EINVAL); 3112 /* 3113 * Determine the position that the destination options header 3114 * should be inserted; before or after the routing header. 3115 */ 3116 switch (optname) { 3117 case IPV6_2292DSTOPTS: 3118 /* 3119 * The old advanced API is ambiguous on this point. 3120 * Our approach is to determine the position based 3121 * according to the existence of a routing header. 3122 * Note, however, that this depends on the order of the 3123 * extension headers in the ancillary data; the 1st 3124 * part of the destination options header must appear 3125 * before the routing header in the ancillary data, 3126 * too. 3127 * RFC3542 solved the ambiguity by introducing 3128 * separate ancillary data or option types. 3129 */ 3130 if (opt->ip6po_rthdr == NULL) 3131 newdest = &opt->ip6po_dest1; 3132 else 3133 newdest = &opt->ip6po_dest2; 3134 break; 3135 case IPV6_RTHDRDSTOPTS: 3136 newdest = &opt->ip6po_dest1; 3137 break; 3138 case IPV6_DSTOPTS: 3139 newdest = &opt->ip6po_dest2; 3140 break; 3141 } 3142 3143 /* turn off the previous option, then set the new option. */ 3144 ip6_clearpktopts(opt, optname); 3145 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3146 if (*newdest == NULL) 3147 return (ENOBUFS); 3148 memcpy(*newdest, dest, destlen); 3149 3150 break; 3151 } 3152 3153 #ifdef RFC2292 3154 case IPV6_2292RTHDR: 3155 #endif 3156 case IPV6_RTHDR: 3157 { 3158 struct ip6_rthdr *rth; 3159 int rthlen; 3160 3161 if (len == 0) { 3162 ip6_clearpktopts(opt, IPV6_RTHDR); 3163 break; /* just remove the option */ 3164 } 3165 3166 /* message length validation */ 3167 if (len < sizeof(struct ip6_rthdr)) 3168 return (EINVAL); 3169 rth = (struct ip6_rthdr *)buf; 3170 rthlen = (rth->ip6r_len + 1) << 3; 3171 if (len != rthlen) 3172 return (EINVAL); 3173 switch (rth->ip6r_type) { 3174 case IPV6_RTHDR_TYPE_0: 3175 if (rth->ip6r_len == 0) /* must contain one addr */ 3176 return (EINVAL); 3177 if (rth->ip6r_len % 2) /* length must be even */ 3178 return (EINVAL); 3179 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3180 return (EINVAL); 3181 break; 3182 default: 3183 return (EINVAL); /* not supported */ 3184 } 3185 /* turn off the previous option */ 3186 ip6_clearpktopts(opt, IPV6_RTHDR); 3187 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3188 if (opt->ip6po_rthdr == NULL) 3189 return (ENOBUFS); 3190 memcpy(opt->ip6po_rthdr, rth, rthlen); 3191 break; 3192 } 3193 3194 case IPV6_USE_MIN_MTU: 3195 if (len != sizeof(int)) 3196 return (EINVAL); 3197 minmtupolicy = *(int *)buf; 3198 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3199 minmtupolicy != IP6PO_MINMTU_DISABLE && 3200 minmtupolicy != IP6PO_MINMTU_ALL) { 3201 return (EINVAL); 3202 } 3203 opt->ip6po_minmtu = minmtupolicy; 3204 break; 3205 3206 case IPV6_DONTFRAG: 3207 if (len != sizeof(int)) 3208 return (EINVAL); 3209 3210 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3211 /* 3212 * we ignore this option for TCP sockets. 3213 * (RFC3542 leaves this case unspecified.) 3214 */ 3215 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3216 } else 3217 opt->ip6po_flags |= IP6PO_DONTFRAG; 3218 break; 3219 3220 default: 3221 return (ENOPROTOOPT); 3222 } /* end of switch */ 3223 3224 return (0); 3225 } 3226 3227 /* 3228 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3229 * packet to the input queue of a specified interface. Note that this 3230 * calls the output routine of the loopback "driver", but with an interface 3231 * pointer that might NOT be lo0ifp -- easier than replicating that code here. 3232 */ 3233 void 3234 ip6_mloopback(ifp, m, dst) 3235 struct ifnet *ifp; 3236 struct mbuf *m; 3237 struct sockaddr_in6 *dst; 3238 { 3239 struct mbuf *copym; 3240 struct ip6_hdr *ip6; 3241 3242 copym = m_copy(m, 0, M_COPYALL); 3243 if (copym == NULL) 3244 return; 3245 3246 /* 3247 * Make sure to deep-copy IPv6 header portion in case the data 3248 * is in an mbuf cluster, so that we can safely override the IPv6 3249 * header portion later. 3250 */ 3251 if ((copym->m_flags & M_EXT) != 0 || 3252 copym->m_len < sizeof(struct ip6_hdr)) { 3253 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3254 if (copym == NULL) 3255 return; 3256 } 3257 3258 #ifdef DIAGNOSTIC 3259 if (copym->m_len < sizeof(*ip6)) { 3260 m_freem(copym); 3261 return; 3262 } 3263 #endif 3264 3265 ip6 = mtod(copym, struct ip6_hdr *); 3266 /* 3267 * clear embedded scope identifiers if necessary. 3268 * in6_clearscope will touch the addresses only when necessary. 3269 */ 3270 in6_clearscope(&ip6->ip6_src); 3271 in6_clearscope(&ip6->ip6_dst); 3272 3273 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 3274 } 3275 3276 /* 3277 * Chop IPv6 header off from the payload. 3278 */ 3279 static int 3280 ip6_splithdr(m, exthdrs) 3281 struct mbuf *m; 3282 struct ip6_exthdrs *exthdrs; 3283 { 3284 struct mbuf *mh; 3285 struct ip6_hdr *ip6; 3286 3287 ip6 = mtod(m, struct ip6_hdr *); 3288 if (m->m_len > sizeof(*ip6)) { 3289 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3290 if (mh == 0) { 3291 m_freem(m); 3292 return ENOBUFS; 3293 } 3294 M_MOVE_PKTHDR(mh, m); 3295 MH_ALIGN(mh, sizeof(*ip6)); 3296 m->m_len -= sizeof(*ip6); 3297 m->m_data += sizeof(*ip6); 3298 mh->m_next = m; 3299 m = mh; 3300 m->m_len = sizeof(*ip6); 3301 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3302 } 3303 exthdrs->ip6e_ip6 = m; 3304 return 0; 3305 } 3306 3307 /* 3308 * Compute IPv6 extension header length. 3309 */ 3310 int 3311 ip6_optlen(in6p) 3312 struct in6pcb *in6p; 3313 { 3314 int len; 3315 3316 if (!in6p->in6p_outputopts) 3317 return 0; 3318 3319 len = 0; 3320 #define elen(x) \ 3321 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3322 3323 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3324 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3325 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3326 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3327 return len; 3328 #undef elen 3329 } 3330
Indexes created Tue Sep 30 20:09:53 GMT 2025