ip6_output.c revision 1.23.2.2
1 /* $NetBSD: ip6_output.c,v 1.23.2.2 2001/02/04 19:22:08 he Exp $ */ 2 /* $KAME: ip6_output.c,v 1.109 2000/05/31 05:03:09 jinmei 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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include "opt_inet.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 82 #include <net/if.h> 83 #include <net/route.h> 84 #ifdef PFIL_HOOKS 85 #include <net/pfil.h> 86 #endif 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/in6_pcb.h> 94 #include <netinet6/nd6.h> 95 96 #ifdef IPSEC 97 #include <netinet6/ipsec.h> 98 #include <netkey/key.h> 99 #include <netkey/key_debug.h> 100 #endif /* IPSEC */ 101 102 #include "loop.h" 103 104 #include <net/net_osdep.h> 105 106 #ifdef IPV6FIREWALL 107 #include <netinet6/ip6_fw.h> 108 #endif 109 110 struct ip6_exthdrs { 111 struct mbuf *ip6e_ip6; 112 struct mbuf *ip6e_hbh; 113 struct mbuf *ip6e_dest1; 114 struct mbuf *ip6e_rthdr; 115 struct mbuf *ip6e_dest2; 116 }; 117 118 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 119 struct socket *)); 120 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 121 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 122 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 123 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 124 struct ip6_frag **)); 125 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 126 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 127 128 extern struct ifnet loif[NLOOP]; 129 130 /* 131 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 132 * header (with pri, len, nxt, hlim, src, dst). 133 * This function may modify ver and hlim only. 134 * The mbuf chain containing the packet will be freed. 135 * The mbuf opt, if present, will not be freed. 136 */ 137 int 138 ip6_output(m0, opt, ro, flags, im6o, ifpp) 139 struct mbuf *m0; 140 struct ip6_pktopts *opt; 141 struct route_in6 *ro; 142 int flags; 143 struct ip6_moptions *im6o; 144 struct ifnet **ifpp; /* XXX: just for statistics */ 145 { 146 struct ip6_hdr *ip6, *mhip6; 147 struct ifnet *ifp, *origifp; 148 struct mbuf *m = m0; 149 int hlen, tlen, len, off; 150 struct route_in6 ip6route; 151 struct sockaddr_in6 *dst; 152 int error = 0; 153 struct in6_ifaddr *ia; 154 u_long mtu; 155 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 156 struct ip6_exthdrs exthdrs; 157 struct in6_addr finaldst; 158 struct route_in6 *ro_pmtu = NULL; 159 int hdrsplit = 0; 160 int needipsec = 0; 161 #ifdef PFIL_HOOKS 162 struct packet_filter_hook *pfh; 163 struct mbuf *m1; 164 int rv; 165 #endif /* PFIL_HOOKS */ 166 #ifdef IPSEC 167 int needipsectun = 0; 168 struct socket *so; 169 struct secpolicy *sp = NULL; 170 171 /* for AH processing. stupid to have "socket" variable in IP layer... */ 172 so = ipsec_getsocket(m); 173 ipsec_setsocket(m, NULL); 174 ip6 = mtod(m, struct ip6_hdr *); 175 #endif /* IPSEC */ 176 177 #define MAKE_EXTHDR(hp, mp) \ 178 do { \ 179 if (hp) { \ 180 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 181 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 182 ((eh)->ip6e_len + 1) << 3); \ 183 if (error) \ 184 goto freehdrs; \ 185 } \ 186 } while (0) 187 188 bzero(&exthdrs, sizeof(exthdrs)); 189 if (opt) { 190 /* Hop-by-Hop options header */ 191 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 192 /* Destination options header(1st part) */ 193 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 194 /* Routing header */ 195 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 196 /* Destination options header(2nd part) */ 197 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 198 } 199 200 #ifdef IPSEC 201 /* get a security policy for this packet */ 202 if (so == NULL) 203 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 204 else 205 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 206 207 if (sp == NULL) { 208 ipsec6stat.out_inval++; 209 goto freehdrs; 210 } 211 212 error = 0; 213 214 /* check policy */ 215 switch (sp->policy) { 216 case IPSEC_POLICY_DISCARD: 217 /* 218 * This packet is just discarded. 219 */ 220 ipsec6stat.out_polvio++; 221 goto freehdrs; 222 223 case IPSEC_POLICY_BYPASS: 224 case IPSEC_POLICY_NONE: 225 /* no need to do IPsec. */ 226 needipsec = 0; 227 break; 228 229 case IPSEC_POLICY_IPSEC: 230 if (sp->req == NULL) { 231 /* XXX should be panic ? */ 232 printf("ip6_output: No IPsec request specified.\n"); 233 error = EINVAL; 234 goto freehdrs; 235 } 236 needipsec = 1; 237 break; 238 239 case IPSEC_POLICY_ENTRUST: 240 default: 241 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 242 } 243 #endif /* IPSEC */ 244 245 /* 246 * Calculate the total length of the extension header chain. 247 * Keep the length of the unfragmentable part for fragmentation. 248 */ 249 optlen = 0; 250 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 251 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 252 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 253 unfragpartlen = optlen + sizeof(struct ip6_hdr); 254 /* NOTE: we don't add AH/ESP length here. do that later. */ 255 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 256 257 /* 258 * If we need IPsec, or there is at least one extension header, 259 * separate IP6 header from the payload. 260 */ 261 if ((needipsec || optlen) && !hdrsplit) { 262 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 263 m = NULL; 264 goto freehdrs; 265 } 266 m = exthdrs.ip6e_ip6; 267 hdrsplit++; 268 } 269 270 /* adjust pointer */ 271 ip6 = mtod(m, struct ip6_hdr *); 272 273 /* adjust mbuf packet header length */ 274 m->m_pkthdr.len += optlen; 275 plen = m->m_pkthdr.len - sizeof(*ip6); 276 277 /* If this is a jumbo payload, insert a jumbo payload option. */ 278 if (plen > IPV6_MAXPACKET) { 279 if (!hdrsplit) { 280 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 281 m = NULL; 282 goto freehdrs; 283 } 284 m = exthdrs.ip6e_ip6; 285 hdrsplit++; 286 } 287 /* adjust pointer */ 288 ip6 = mtod(m, struct ip6_hdr *); 289 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 290 goto freehdrs; 291 ip6->ip6_plen = 0; 292 } else 293 ip6->ip6_plen = htons(plen); 294 295 /* 296 * Concatenate headers and fill in next header fields. 297 * Here we have, on "m" 298 * IPv6 payload 299 * and we insert headers accordingly. Finally, we should be getting: 300 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 301 * 302 * during the header composing process, "m" points to IPv6 header. 303 * "mprev" points to an extension header prior to esp. 304 */ 305 { 306 u_char *nexthdrp = &ip6->ip6_nxt; 307 struct mbuf *mprev = m; 308 309 /* 310 * we treat dest2 specially. this makes IPsec processing 311 * much easier. 312 * 313 * result: IPv6 dest2 payload 314 * m and mprev will point to IPv6 header. 315 */ 316 if (exthdrs.ip6e_dest2) { 317 if (!hdrsplit) 318 panic("assumption failed: hdr not split"); 319 exthdrs.ip6e_dest2->m_next = m->m_next; 320 m->m_next = exthdrs.ip6e_dest2; 321 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 322 ip6->ip6_nxt = IPPROTO_DSTOPTS; 323 } 324 325 #define MAKE_CHAIN(m, mp, p, i)\ 326 do {\ 327 if (m) {\ 328 if (!hdrsplit) \ 329 panic("assumption failed: hdr not split"); \ 330 *mtod((m), u_char *) = *(p);\ 331 *(p) = (i);\ 332 p = mtod((m), u_char *);\ 333 (m)->m_next = (mp)->m_next;\ 334 (mp)->m_next = (m);\ 335 (mp) = (m);\ 336 }\ 337 } while (0) 338 /* 339 * result: IPv6 hbh dest1 rthdr dest2 payload 340 * m will point to IPv6 header. mprev will point to the 341 * extension header prior to dest2 (rthdr in the above case). 342 */ 343 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 344 nexthdrp, IPPROTO_HOPOPTS); 345 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 346 nexthdrp, IPPROTO_DSTOPTS); 347 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 348 nexthdrp, IPPROTO_ROUTING); 349 350 #ifdef IPSEC 351 if (!needipsec) 352 goto skip_ipsec2; 353 354 /* 355 * pointers after IPsec headers are not valid any more. 356 * other pointers need a great care too. 357 * (IPsec routines should not mangle mbufs prior to AH/ESP) 358 */ 359 exthdrs.ip6e_dest2 = NULL; 360 361 { 362 struct ip6_rthdr *rh = NULL; 363 int segleft_org = 0; 364 struct ipsec_output_state state; 365 366 if (exthdrs.ip6e_rthdr) { 367 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 368 segleft_org = rh->ip6r_segleft; 369 rh->ip6r_segleft = 0; 370 } 371 372 bzero(&state, sizeof(state)); 373 state.m = m; 374 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 375 &needipsectun); 376 m = state.m; 377 if (error) { 378 /* mbuf is already reclaimed in ipsec6_output_trans. */ 379 m = NULL; 380 switch (error) { 381 case EHOSTUNREACH: 382 case ENETUNREACH: 383 case EMSGSIZE: 384 case ENOBUFS: 385 case ENOMEM: 386 break; 387 default: 388 printf("ip6_output (ipsec): error code %d\n", error); 389 /*fall through*/ 390 case ENOENT: 391 /* don't show these error codes to the user */ 392 error = 0; 393 break; 394 } 395 goto bad; 396 } 397 if (exthdrs.ip6e_rthdr) { 398 /* ah6_output doesn't modify mbuf chain */ 399 rh->ip6r_segleft = segleft_org; 400 } 401 } 402 skip_ipsec2:; 403 #endif 404 } 405 406 /* 407 * If there is a routing header, replace destination address field 408 * with the first hop of the routing header. 409 */ 410 if (exthdrs.ip6e_rthdr) { 411 struct ip6_rthdr *rh = 412 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 413 struct ip6_rthdr *)); 414 struct ip6_rthdr0 *rh0; 415 416 finaldst = ip6->ip6_dst; 417 switch(rh->ip6r_type) { 418 case IPV6_RTHDR_TYPE_0: 419 rh0 = (struct ip6_rthdr0 *)rh; 420 ip6->ip6_dst = rh0->ip6r0_addr[0]; 421 bcopy((caddr_t)&rh0->ip6r0_addr[1], 422 (caddr_t)&rh0->ip6r0_addr[0], 423 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 424 ); 425 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 426 break; 427 default: /* is it possible? */ 428 error = EINVAL; 429 goto bad; 430 } 431 } 432 433 /* Source address validation */ 434 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 435 (flags & IPV6_DADOUTPUT) == 0) { 436 error = EOPNOTSUPP; 437 ip6stat.ip6s_badscope++; 438 goto bad; 439 } 440 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 441 error = EOPNOTSUPP; 442 ip6stat.ip6s_badscope++; 443 goto bad; 444 } 445 446 ip6stat.ip6s_localout++; 447 448 /* 449 * Route packet. 450 */ 451 if (ro == 0) { 452 ro = &ip6route; 453 bzero((caddr_t)ro, sizeof(*ro)); 454 } 455 ro_pmtu = ro; 456 if (opt && opt->ip6po_rthdr) 457 ro = &opt->ip6po_route; 458 dst = (struct sockaddr_in6 *)&ro->ro_dst; 459 /* 460 * If there is a cached route, 461 * check that it is to the same destination 462 * and is still up. If not, free it and try again. 463 */ 464 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 465 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 466 RTFREE(ro->ro_rt); 467 ro->ro_rt = (struct rtentry *)0; 468 } 469 if (ro->ro_rt == 0) { 470 bzero(dst, sizeof(*dst)); 471 dst->sin6_family = AF_INET6; 472 dst->sin6_len = sizeof(struct sockaddr_in6); 473 dst->sin6_addr = ip6->ip6_dst; 474 } 475 #ifdef IPSEC 476 if (needipsec && needipsectun) { 477 struct ipsec_output_state state; 478 479 /* 480 * All the extension headers will become inaccessible 481 * (since they can be encrypted). 482 * Don't panic, we need no more updates to extension headers 483 * on inner IPv6 packet (since they are now encapsulated). 484 * 485 * IPv6 [ESP|AH] IPv6 [extension headers] payload 486 */ 487 bzero(&exthdrs, sizeof(exthdrs)); 488 exthdrs.ip6e_ip6 = m; 489 490 bzero(&state, sizeof(state)); 491 state.m = m; 492 state.ro = (struct route *)ro; 493 state.dst = (struct sockaddr *)dst; 494 495 error = ipsec6_output_tunnel(&state, sp, flags); 496 497 m = state.m; 498 ro = (struct route_in6 *)state.ro; 499 dst = (struct sockaddr_in6 *)state.dst; 500 if (error) { 501 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 502 m0 = m = NULL; 503 m = NULL; 504 switch (error) { 505 case EHOSTUNREACH: 506 case ENETUNREACH: 507 case EMSGSIZE: 508 case ENOBUFS: 509 case ENOMEM: 510 break; 511 default: 512 printf("ip6_output (ipsec): error code %d\n", error); 513 /*fall through*/ 514 case ENOENT: 515 /* don't show these error codes to the user */ 516 error = 0; 517 break; 518 } 519 goto bad; 520 } 521 522 exthdrs.ip6e_ip6 = m; 523 } 524 #endif /*IPSEC*/ 525 526 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 527 /* Unicast */ 528 529 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 530 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 531 /* xxx 532 * interface selection comes here 533 * if an interface is specified from an upper layer, 534 * ifp must point it. 535 */ 536 if (ro->ro_rt == 0) { 537 /* 538 * non-bsdi always clone routes, if parent is 539 * PRF_CLONING. 540 */ 541 rtalloc((struct route *)ro); 542 } 543 if (ro->ro_rt == 0) { 544 ip6stat.ip6s_noroute++; 545 error = EHOSTUNREACH; 546 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 547 goto bad; 548 } 549 ia = ifatoia6(ro->ro_rt->rt_ifa); 550 ifp = ro->ro_rt->rt_ifp; 551 ro->ro_rt->rt_use++; 552 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 553 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 554 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 555 556 in6_ifstat_inc(ifp, ifs6_out_request); 557 558 /* 559 * Check if the outgoing interface conflicts with 560 * the interface specified by ifi6_ifindex (if specified). 561 * Note that loopback interface is always okay. 562 * (this may happen when we are sending a packet to one of 563 * our own addresses.) 564 */ 565 if (opt && opt->ip6po_pktinfo 566 && opt->ip6po_pktinfo->ipi6_ifindex) { 567 if (!(ifp->if_flags & IFF_LOOPBACK) 568 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 569 ip6stat.ip6s_noroute++; 570 in6_ifstat_inc(ifp, ifs6_out_discard); 571 error = EHOSTUNREACH; 572 goto bad; 573 } 574 } 575 576 if (opt && opt->ip6po_hlim != -1) 577 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 578 } else { 579 /* Multicast */ 580 struct in6_multi *in6m; 581 582 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 583 584 /* 585 * See if the caller provided any multicast options 586 */ 587 ifp = NULL; 588 if (im6o != NULL) { 589 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 590 if (im6o->im6o_multicast_ifp != NULL) 591 ifp = im6o->im6o_multicast_ifp; 592 } else 593 ip6->ip6_hlim = ip6_defmcasthlim; 594 595 /* 596 * See if the caller provided the outgoing interface 597 * as an ancillary data. 598 * Boundary check for ifindex is assumed to be already done. 599 */ 600 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 601 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 602 603 /* 604 * If the destination is a node-local scope multicast, 605 * the packet should be loop-backed only. 606 */ 607 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 608 /* 609 * If the outgoing interface is already specified, 610 * it should be a loopback interface. 611 */ 612 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 613 ip6stat.ip6s_badscope++; 614 error = ENETUNREACH; /* XXX: better error? */ 615 /* XXX correct ifp? */ 616 in6_ifstat_inc(ifp, ifs6_out_discard); 617 goto bad; 618 } else { 619 ifp = &loif[0]; 620 } 621 } 622 623 if (opt && opt->ip6po_hlim != -1) 624 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 625 626 /* 627 * If caller did not provide an interface lookup a 628 * default in the routing table. This is either a 629 * default for the speicfied group (i.e. a host 630 * route), or a multicast default (a route for the 631 * ``net'' ff00::/8). 632 */ 633 if (ifp == NULL) { 634 if (ro->ro_rt == 0) { 635 ro->ro_rt = rtalloc1((struct sockaddr *) 636 &ro->ro_dst, 0 637 ); 638 } 639 if (ro->ro_rt == 0) { 640 ip6stat.ip6s_noroute++; 641 error = EHOSTUNREACH; 642 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 643 goto bad; 644 } 645 ia = ifatoia6(ro->ro_rt->rt_ifa); 646 ifp = ro->ro_rt->rt_ifp; 647 ro->ro_rt->rt_use++; 648 } 649 650 if ((flags & IPV6_FORWARDING) == 0) 651 in6_ifstat_inc(ifp, ifs6_out_request); 652 in6_ifstat_inc(ifp, ifs6_out_mcast); 653 654 /* 655 * Confirm that the outgoing interface supports multicast. 656 */ 657 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 658 ip6stat.ip6s_noroute++; 659 in6_ifstat_inc(ifp, ifs6_out_discard); 660 error = ENETUNREACH; 661 goto bad; 662 } 663 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 664 if (in6m != NULL && 665 (im6o == NULL || im6o->im6o_multicast_loop)) { 666 /* 667 * If we belong to the destination multicast group 668 * on the outgoing interface, and the caller did not 669 * forbid loopback, loop back a copy. 670 */ 671 ip6_mloopback(ifp, m, dst); 672 } else { 673 /* 674 * If we are acting as a multicast router, perform 675 * multicast forwarding as if the packet had just 676 * arrived on the interface to which we are about 677 * to send. The multicast forwarding function 678 * recursively calls this function, using the 679 * IPV6_FORWARDING flag to prevent infinite recursion. 680 * 681 * Multicasts that are looped back by ip6_mloopback(), 682 * above, will be forwarded by the ip6_input() routine, 683 * if necessary. 684 */ 685 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 686 if (ip6_mforward(ip6, ifp, m) != 0) { 687 m_freem(m); 688 goto done; 689 } 690 } 691 } 692 /* 693 * Multicasts with a hoplimit of zero may be looped back, 694 * above, but must not be transmitted on a network. 695 * Also, multicasts addressed to the loopback interface 696 * are not sent -- the above call to ip6_mloopback() will 697 * loop back a copy if this host actually belongs to the 698 * destination group on the loopback interface. 699 */ 700 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 701 m_freem(m); 702 goto done; 703 } 704 } 705 706 /* 707 * Fill the outgoing inteface to tell the upper layer 708 * to increment per-interface statistics. 709 */ 710 if (ifpp) 711 *ifpp = ifp; 712 713 /* 714 * Determine path MTU. 715 */ 716 if (ro_pmtu != ro) { 717 /* The first hop and the final destination may differ. */ 718 struct sockaddr_in6 *sin6_fin = 719 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 720 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 721 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 722 &finaldst))) { 723 RTFREE(ro_pmtu->ro_rt); 724 ro_pmtu->ro_rt = (struct rtentry *)0; 725 } 726 if (ro_pmtu->ro_rt == 0) { 727 bzero(sin6_fin, sizeof(*sin6_fin)); 728 sin6_fin->sin6_family = AF_INET6; 729 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 730 sin6_fin->sin6_addr = finaldst; 731 732 rtalloc((struct route *)ro_pmtu); 733 } 734 } 735 if (ro_pmtu->ro_rt != NULL) { 736 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 737 738 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 739 if (mtu > ifmtu) { 740 /* 741 * The MTU on the route is larger than the MTU on 742 * the interface! This shouldn't happen, unless the 743 * MTU of the interface has been changed after the 744 * interface was brought up. Change the MTU in the 745 * route to match the interface MTU (as long as the 746 * field isn't locked). 747 */ 748 mtu = ifmtu; 749 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 750 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 751 } 752 } else { 753 mtu = nd_ifinfo[ifp->if_index].linkmtu; 754 } 755 756 /* Fake scoped addresses */ 757 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 758 /* 759 * If source or destination address is a scoped address, and 760 * the packet is going to be sent to a loopback interface, 761 * we should keep the original interface. 762 */ 763 764 /* 765 * XXX: this is a very experimental and temporary solution. 766 * We eventually have sockaddr_in6 and use the sin6_scope_id 767 * field of the structure here. 768 * We rely on the consistency between two scope zone ids 769 * of source add destination, which should already be assured 770 * Larger scopes than link will be supported in the near 771 * future. 772 */ 773 origifp = NULL; 774 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 775 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 776 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 777 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 778 /* 779 * XXX: origifp can be NULL even in those two cases above. 780 * For example, if we remove the (only) link-local address 781 * from the loopback interface, and try to send a link-local 782 * address without link-id information. Then the source 783 * address is ::1, and the destination address is the 784 * link-local address with its s6_addr16[1] being zero. 785 * What is worse, if the packet goes to the loopback interface 786 * by a default rejected route, the null pointer would be 787 * passed to looutput, and the kernel would hang. 788 * The following last resort would prevent such disaster. 789 */ 790 if (origifp == NULL); 791 origifp = ifp; 792 } 793 else 794 origifp = ifp; 795 #ifndef FAKE_LOOPBACK_IF 796 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 797 #else 798 if (1) 799 #endif 800 { 801 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 802 ip6->ip6_src.s6_addr16[1] = 0; 803 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 804 ip6->ip6_dst.s6_addr16[1] = 0; 805 } 806 807 /* 808 * If the outgoing packet contains a hop-by-hop options header, 809 * it must be examined and processed even by the source node. 810 * (RFC 2460, section 4.) 811 */ 812 if (exthdrs.ip6e_hbh) { 813 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, 814 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, 827 (u_int8_t *)(hbh + 1), 828 ((hbh->ip6h_len + 1) << 3) - 829 sizeof(struct ip6_hbh), 830 &dummy1, &dummy2) < 0) { 831 /* m was already freed at this point */ 832 error = EINVAL;/* better error? */ 833 goto done; 834 } 835 m->m_flags &= ~M_LOOP; /* XXX */ 836 m->m_pkthdr.rcvif = NULL; 837 } 838 839 #ifdef PFIL_HOOKS 840 /* 841 * Run through list of hooks for output packets. 842 */ 843 m1 = m; 844 pfh = pfil_hook_get(PFIL_OUT, &inetsw[ip_protox[IPPROTO_IPV6]].pr_pfh); 845 for (; pfh; pfh = pfh->pfil_link.tqe_next) 846 if (pfh->pfil_func) { 847 rv = pfh->pfil_func(ip6, sizeof(*ip6), ifp, 1, &m1); 848 if (rv) { 849 error = EHOSTUNREACH; 850 goto done; 851 } 852 m = m1; 853 if (m == NULL) 854 goto done; 855 ip6 = mtod(m, struct ip6_hdr *); 856 } 857 #endif /* PFIL_HOOKS */ 858 /* 859 * Send the packet to the outgoing interface. 860 * If necessary, do IPv6 fragmentation before sending. 861 */ 862 tlen = m->m_pkthdr.len; 863 if (tlen <= mtu 864 #ifdef notyet 865 /* 866 * On any link that cannot convey a 1280-octet packet in one piece, 867 * link-specific fragmentation and reassembly must be provided at 868 * a layer below IPv6. [RFC 2460, sec.5] 869 * Thus if the interface has ability of link-level fragmentation, 870 * we can just send the packet even if the packet size is 871 * larger than the link's MTU. 872 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 873 */ 874 875 || ifp->if_flags & IFF_FRAGMENTABLE 876 #endif 877 ) 878 { 879 #ifdef IFA_STATS 880 if (IFA_STATS) { 881 struct in6_ifaddr *ia6; 882 ip6 = mtod(m, struct ip6_hdr *); 883 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 884 if (ia6) { 885 ia->ia_ifa.ifa_data.ifad_outbytes += 886 m->m_pkthdr.len; 887 } 888 } 889 #endif 890 #ifdef OLDIP6OUTPUT 891 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 892 ro->ro_rt); 893 #else 894 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 895 #endif 896 goto done; 897 } else if (mtu < IPV6_MMTU) { 898 /* 899 * note that path MTU is never less than IPV6_MMTU 900 * (see icmp6_input). 901 */ 902 error = EMSGSIZE; 903 in6_ifstat_inc(ifp, ifs6_out_fragfail); 904 goto bad; 905 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 906 error = EMSGSIZE; 907 in6_ifstat_inc(ifp, ifs6_out_fragfail); 908 goto bad; 909 } else { 910 struct mbuf **mnext, *m_frgpart; 911 struct ip6_frag *ip6f; 912 u_int32_t id = htonl(ip6_id++); 913 u_char nextproto; 914 915 /* 916 * Too large for the destination or interface; 917 * fragment if possible. 918 * Must be able to put at least 8 bytes per fragment. 919 */ 920 hlen = unfragpartlen; 921 if (mtu > IPV6_MAXPACKET) 922 mtu = IPV6_MAXPACKET; 923 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 924 if (len < 8) { 925 error = EMSGSIZE; 926 in6_ifstat_inc(ifp, ifs6_out_fragfail); 927 goto bad; 928 } 929 930 mnext = &m->m_nextpkt; 931 932 /* 933 * Change the next header field of the last header in the 934 * unfragmentable part. 935 */ 936 if (exthdrs.ip6e_rthdr) { 937 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 938 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 939 } else if (exthdrs.ip6e_dest1) { 940 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 941 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 942 } else if (exthdrs.ip6e_hbh) { 943 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 944 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 945 } else { 946 nextproto = ip6->ip6_nxt; 947 ip6->ip6_nxt = IPPROTO_FRAGMENT; 948 } 949 950 /* 951 * Loop through length of segment after first fragment, 952 * make new header and copy data of each part and link onto chain. 953 */ 954 m0 = m; 955 for (off = hlen; off < tlen; off += len) { 956 MGETHDR(m, M_DONTWAIT, MT_HEADER); 957 if (!m) { 958 error = ENOBUFS; 959 ip6stat.ip6s_odropped++; 960 goto sendorfree; 961 } 962 m->m_flags = m0->m_flags & M_COPYFLAGS; 963 *mnext = m; 964 mnext = &m->m_nextpkt; 965 m->m_data += max_linkhdr; 966 mhip6 = mtod(m, struct ip6_hdr *); 967 *mhip6 = *ip6; 968 m->m_len = sizeof(*mhip6); 969 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 970 if (error) { 971 ip6stat.ip6s_odropped++; 972 goto sendorfree; 973 } 974 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 975 if (off + len >= tlen) 976 len = tlen - off; 977 else 978 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 979 mhip6->ip6_plen = htons((u_short)(len + hlen + 980 sizeof(*ip6f) - 981 sizeof(struct ip6_hdr))); 982 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 983 error = ENOBUFS; 984 ip6stat.ip6s_odropped++; 985 goto sendorfree; 986 } 987 m_cat(m, m_frgpart); 988 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 989 m->m_pkthdr.rcvif = (struct ifnet *)0; 990 ip6f->ip6f_reserved = 0; 991 ip6f->ip6f_ident = id; 992 ip6f->ip6f_nxt = nextproto; 993 ip6stat.ip6s_ofragments++; 994 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 995 } 996 997 in6_ifstat_inc(ifp, ifs6_out_fragok); 998 } 999 1000 /* 1001 * Remove leading garbages. 1002 */ 1003 sendorfree: 1004 m = m0->m_nextpkt; 1005 m0->m_nextpkt = 0; 1006 m_freem(m0); 1007 for (m0 = m; m; m = m0) { 1008 m0 = m->m_nextpkt; 1009 m->m_nextpkt = 0; 1010 if (error == 0) { 1011 #ifdef IFA_STATS 1012 if (IFA_STATS) { 1013 struct in6_ifaddr *ia6; 1014 ip6 = mtod(m, struct ip6_hdr *); 1015 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1016 if (ia6) { 1017 ia->ia_ifa.ifa_data.ifad_outbytes += 1018 m->m_pkthdr.len; 1019 } 1020 } 1021 #endif 1022 #ifdef OLDIP6OUTPUT 1023 error = (*ifp->if_output)(ifp, m, 1024 (struct sockaddr *)dst, 1025 ro->ro_rt); 1026 #else 1027 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1028 #endif 1029 } else 1030 m_freem(m); 1031 } 1032 1033 if (error == 0) 1034 ip6stat.ip6s_fragmented++; 1035 1036 done: 1037 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1038 RTFREE(ro->ro_rt); 1039 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1040 RTFREE(ro_pmtu->ro_rt); 1041 } 1042 1043 #ifdef IPSEC 1044 if (sp != NULL) 1045 key_freesp(sp); 1046 #endif /* IPSEC */ 1047 1048 return(error); 1049 1050 freehdrs: 1051 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1052 m_freem(exthdrs.ip6e_dest1); 1053 m_freem(exthdrs.ip6e_rthdr); 1054 m_freem(exthdrs.ip6e_dest2); 1055 /* fall through */ 1056 bad: 1057 m_freem(m); 1058 goto done; 1059 } 1060 1061 static int 1062 ip6_copyexthdr(mp, hdr, hlen) 1063 struct mbuf **mp; 1064 caddr_t hdr; 1065 int hlen; 1066 { 1067 struct mbuf *m; 1068 1069 if (hlen > MCLBYTES) 1070 return(ENOBUFS); /* XXX */ 1071 1072 MGET(m, M_DONTWAIT, MT_DATA); 1073 if (!m) 1074 return(ENOBUFS); 1075 1076 if (hlen > MLEN) { 1077 MCLGET(m, M_DONTWAIT); 1078 if ((m->m_flags & M_EXT) == 0) { 1079 m_free(m); 1080 return(ENOBUFS); 1081 } 1082 } 1083 m->m_len = hlen; 1084 if (hdr) 1085 bcopy(hdr, mtod(m, caddr_t), hlen); 1086 1087 *mp = m; 1088 return(0); 1089 } 1090 1091 /* 1092 * Insert jumbo payload option. 1093 */ 1094 static int 1095 ip6_insert_jumboopt(exthdrs, plen) 1096 struct ip6_exthdrs *exthdrs; 1097 u_int32_t plen; 1098 { 1099 struct mbuf *mopt; 1100 u_char *optbuf; 1101 1102 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1103 1104 /* 1105 * If there is no hop-by-hop options header, allocate new one. 1106 * If there is one but it doesn't have enough space to store the 1107 * jumbo payload option, allocate a cluster to store the whole options. 1108 * Otherwise, use it to store the options. 1109 */ 1110 if (exthdrs->ip6e_hbh == 0) { 1111 MGET(mopt, M_DONTWAIT, MT_DATA); 1112 if (mopt == 0) 1113 return(ENOBUFS); 1114 mopt->m_len = JUMBOOPTLEN; 1115 optbuf = mtod(mopt, u_char *); 1116 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1117 exthdrs->ip6e_hbh = mopt; 1118 } else { 1119 struct ip6_hbh *hbh; 1120 1121 mopt = exthdrs->ip6e_hbh; 1122 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1123 caddr_t oldoptp = mtod(mopt, caddr_t); 1124 int oldoptlen = mopt->m_len; 1125 1126 if (mopt->m_flags & M_EXT) 1127 return(ENOBUFS); /* XXX */ 1128 MCLGET(mopt, M_DONTWAIT); 1129 if ((mopt->m_flags & M_EXT) == 0) 1130 return(ENOBUFS); 1131 1132 bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); 1133 optbuf = mtod(mopt, caddr_t) + oldoptlen; 1134 mopt->m_len = oldoptlen + JUMBOOPTLEN; 1135 } else { 1136 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1137 mopt->m_len += JUMBOOPTLEN; 1138 } 1139 optbuf[0] = IP6OPT_PADN; 1140 optbuf[1] = 1; 1141 1142 /* 1143 * Adjust the header length according to the pad and 1144 * the jumbo payload option. 1145 */ 1146 hbh = mtod(mopt, struct ip6_hbh *); 1147 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1148 } 1149 1150 /* fill in the option. */ 1151 optbuf[2] = IP6OPT_JUMBO; 1152 optbuf[3] = 4; 1153 *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); 1154 1155 /* finally, adjust the packet header length */ 1156 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1157 1158 return(0); 1159 #undef JUMBOOPTLEN 1160 } 1161 1162 /* 1163 * Insert fragment header and copy unfragmentable header portions. 1164 */ 1165 static int 1166 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1167 struct mbuf *m0, *m; 1168 int hlen; 1169 struct ip6_frag **frghdrp; 1170 { 1171 struct mbuf *n, *mlast; 1172 1173 if (hlen > sizeof(struct ip6_hdr)) { 1174 n = m_copym(m0, sizeof(struct ip6_hdr), 1175 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1176 if (n == 0) 1177 return(ENOBUFS); 1178 m->m_next = n; 1179 } else 1180 n = m; 1181 1182 /* Search for the last mbuf of unfragmentable part. */ 1183 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1184 ; 1185 1186 if ((mlast->m_flags & M_EXT) == 0 && 1187 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1188 /* use the trailing space of the last mbuf for the fragment hdr */ 1189 *frghdrp = 1190 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1191 mlast->m_len += sizeof(struct ip6_frag); 1192 m->m_pkthdr.len += sizeof(struct ip6_frag); 1193 } else { 1194 /* allocate a new mbuf for the fragment header */ 1195 struct mbuf *mfrg; 1196 1197 MGET(mfrg, M_DONTWAIT, MT_DATA); 1198 if (mfrg == 0) 1199 return(ENOBUFS); 1200 mfrg->m_len = sizeof(struct ip6_frag); 1201 *frghdrp = mtod(mfrg, struct ip6_frag *); 1202 mlast->m_next = mfrg; 1203 } 1204 1205 return(0); 1206 } 1207 1208 /* 1209 * IP6 socket option processing. 1210 */ 1211 int 1212 ip6_ctloutput(op, so, level, optname, mp) 1213 int op; 1214 struct socket *so; 1215 int level, optname; 1216 struct mbuf **mp; 1217 { 1218 register struct in6pcb *in6p = sotoin6pcb(so); 1219 register struct mbuf *m = *mp; 1220 register int optval = 0; 1221 int error = 0; 1222 struct proc *p = curproc; /* XXX */ 1223 1224 if (level == IPPROTO_IPV6) { 1225 switch (op) { 1226 1227 case PRCO_SETOPT: 1228 switch (optname) { 1229 case IPV6_PKTOPTIONS: 1230 /* m is freed in ip6_pcbopts */ 1231 return(ip6_pcbopts(&in6p->in6p_outputopts, 1232 m, so)); 1233 case IPV6_HOPOPTS: 1234 case IPV6_DSTOPTS: 1235 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1236 error = EPERM; 1237 break; 1238 } 1239 /* fall through */ 1240 case IPV6_UNICAST_HOPS: 1241 case IPV6_RECVOPTS: 1242 case IPV6_RECVRETOPTS: 1243 case IPV6_RECVDSTADDR: 1244 case IPV6_PKTINFO: 1245 case IPV6_HOPLIMIT: 1246 case IPV6_RTHDR: 1247 case IPV6_CHECKSUM: 1248 case IPV6_FAITH: 1249 #ifndef INET6_BINDV6ONLY 1250 case IPV6_BINDV6ONLY: 1251 #endif 1252 if (!m || m->m_len != sizeof(int)) 1253 error = EINVAL; 1254 else { 1255 optval = *mtod(m, int *); 1256 switch (optname) { 1257 1258 case IPV6_UNICAST_HOPS: 1259 if (optval < -1 || optval >= 256) 1260 error = EINVAL; 1261 else { 1262 /* -1 = kernel default */ 1263 in6p->in6p_hops = optval; 1264 } 1265 break; 1266 #define OPTSET(bit) \ 1267 if (optval) \ 1268 in6p->in6p_flags |= bit; \ 1269 else \ 1270 in6p->in6p_flags &= ~bit; 1271 1272 case IPV6_RECVOPTS: 1273 OPTSET(IN6P_RECVOPTS); 1274 break; 1275 1276 case IPV6_RECVRETOPTS: 1277 OPTSET(IN6P_RECVRETOPTS); 1278 break; 1279 1280 case IPV6_RECVDSTADDR: 1281 OPTSET(IN6P_RECVDSTADDR); 1282 break; 1283 1284 case IPV6_PKTINFO: 1285 OPTSET(IN6P_PKTINFO); 1286 break; 1287 1288 case IPV6_HOPLIMIT: 1289 OPTSET(IN6P_HOPLIMIT); 1290 break; 1291 1292 case IPV6_HOPOPTS: 1293 OPTSET(IN6P_HOPOPTS); 1294 break; 1295 1296 case IPV6_DSTOPTS: 1297 OPTSET(IN6P_DSTOPTS); 1298 break; 1299 1300 case IPV6_RTHDR: 1301 OPTSET(IN6P_RTHDR); 1302 break; 1303 1304 case IPV6_CHECKSUM: 1305 in6p->in6p_cksum = optval; 1306 break; 1307 1308 case IPV6_FAITH: 1309 OPTSET(IN6P_FAITH); 1310 break; 1311 1312 #ifndef INET6_BINDV6ONLY 1313 case IPV6_BINDV6ONLY: 1314 OPTSET(IN6P_BINDV6ONLY); 1315 break; 1316 #endif 1317 } 1318 } 1319 break; 1320 #undef OPTSET 1321 1322 case IPV6_MULTICAST_IF: 1323 case IPV6_MULTICAST_HOPS: 1324 case IPV6_MULTICAST_LOOP: 1325 case IPV6_JOIN_GROUP: 1326 case IPV6_LEAVE_GROUP: 1327 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1328 break; 1329 1330 case IPV6_PORTRANGE: 1331 optval = *mtod(m, int *); 1332 1333 switch (optval) { 1334 case IPV6_PORTRANGE_DEFAULT: 1335 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1336 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1337 break; 1338 1339 case IPV6_PORTRANGE_HIGH: 1340 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1341 in6p->in6p_flags |= IN6P_HIGHPORT; 1342 break; 1343 1344 case IPV6_PORTRANGE_LOW: 1345 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1346 in6p->in6p_flags |= IN6P_LOWPORT; 1347 break; 1348 1349 default: 1350 error = EINVAL; 1351 break; 1352 } 1353 break; 1354 1355 #ifdef IPSEC 1356 case IPV6_IPSEC_POLICY: 1357 { 1358 caddr_t req = NULL; 1359 size_t len = 0; 1360 1361 int priv = 0; 1362 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1363 priv = 0; 1364 else 1365 priv = 1; 1366 if (m) { 1367 req = mtod(m, caddr_t); 1368 len = m->m_len; 1369 } 1370 error = ipsec6_set_policy(in6p, 1371 optname, req, len, priv); 1372 } 1373 break; 1374 #endif /* IPSEC */ 1375 1376 default: 1377 error = ENOPROTOOPT; 1378 break; 1379 } 1380 if (m) 1381 (void)m_free(m); 1382 break; 1383 1384 case PRCO_GETOPT: 1385 switch (optname) { 1386 1387 case IPV6_OPTIONS: 1388 case IPV6_RETOPTS: 1389 #if 0 1390 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1391 if (in6p->in6p_options) { 1392 m->m_len = in6p->in6p_options->m_len; 1393 bcopy(mtod(in6p->in6p_options, caddr_t), 1394 mtod(m, caddr_t), 1395 (unsigned)m->m_len); 1396 } else 1397 m->m_len = 0; 1398 break; 1399 #else 1400 error = ENOPROTOOPT; 1401 break; 1402 #endif 1403 1404 case IPV6_PKTOPTIONS: 1405 if (in6p->in6p_options) { 1406 *mp = m_copym(in6p->in6p_options, 0, 1407 M_COPYALL, M_WAIT); 1408 } else { 1409 *mp = m_get(M_WAIT, MT_SOOPTS); 1410 (*mp)->m_len = 0; 1411 } 1412 break; 1413 1414 case IPV6_HOPOPTS: 1415 case IPV6_DSTOPTS: 1416 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1417 error = EPERM; 1418 break; 1419 } 1420 /* fall through */ 1421 case IPV6_UNICAST_HOPS: 1422 case IPV6_RECVOPTS: 1423 case IPV6_RECVRETOPTS: 1424 case IPV6_RECVDSTADDR: 1425 case IPV6_PORTRANGE: 1426 case IPV6_PKTINFO: 1427 case IPV6_HOPLIMIT: 1428 case IPV6_RTHDR: 1429 case IPV6_CHECKSUM: 1430 case IPV6_FAITH: 1431 #ifndef INET6_BINDV6ONLY 1432 case IPV6_BINDV6ONLY: 1433 #endif 1434 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1435 m->m_len = sizeof(int); 1436 switch (optname) { 1437 1438 case IPV6_UNICAST_HOPS: 1439 optval = in6p->in6p_hops; 1440 break; 1441 1442 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1443 1444 case IPV6_RECVOPTS: 1445 optval = OPTBIT(IN6P_RECVOPTS); 1446 break; 1447 1448 case IPV6_RECVRETOPTS: 1449 optval = OPTBIT(IN6P_RECVRETOPTS); 1450 break; 1451 1452 case IPV6_RECVDSTADDR: 1453 optval = OPTBIT(IN6P_RECVDSTADDR); 1454 break; 1455 1456 case IPV6_PORTRANGE: 1457 { 1458 int flags; 1459 flags = in6p->in6p_flags; 1460 if (flags & IN6P_HIGHPORT) 1461 optval = IPV6_PORTRANGE_HIGH; 1462 else if (flags & IN6P_LOWPORT) 1463 optval = IPV6_PORTRANGE_LOW; 1464 else 1465 optval = 0; 1466 break; 1467 } 1468 1469 case IPV6_PKTINFO: 1470 optval = OPTBIT(IN6P_PKTINFO); 1471 break; 1472 1473 case IPV6_HOPLIMIT: 1474 optval = OPTBIT(IN6P_HOPLIMIT); 1475 break; 1476 1477 case IPV6_HOPOPTS: 1478 optval = OPTBIT(IN6P_HOPOPTS); 1479 break; 1480 1481 case IPV6_DSTOPTS: 1482 optval = OPTBIT(IN6P_DSTOPTS); 1483 break; 1484 1485 case IPV6_RTHDR: 1486 optval = OPTBIT(IN6P_RTHDR); 1487 break; 1488 1489 case IPV6_CHECKSUM: 1490 optval = in6p->in6p_cksum; 1491 break; 1492 1493 case IPV6_FAITH: 1494 optval = OPTBIT(IN6P_FAITH); 1495 break; 1496 1497 #ifndef INET6_BINDV6ONLY 1498 case IPV6_BINDV6ONLY: 1499 optval = OPTBIT(IN6P_BINDV6ONLY); 1500 break; 1501 #endif 1502 } 1503 *mtod(m, int *) = optval; 1504 break; 1505 1506 case IPV6_MULTICAST_IF: 1507 case IPV6_MULTICAST_HOPS: 1508 case IPV6_MULTICAST_LOOP: 1509 case IPV6_JOIN_GROUP: 1510 case IPV6_LEAVE_GROUP: 1511 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1512 break; 1513 1514 #ifdef IPSEC 1515 case IPV6_IPSEC_POLICY: 1516 { 1517 caddr_t req = NULL; 1518 size_t len = 0; 1519 1520 if (m) { 1521 req = mtod(m, caddr_t); 1522 len = m->m_len; 1523 } 1524 error = ipsec6_get_policy(in6p, req, len, mp); 1525 break; 1526 } 1527 #endif /* IPSEC */ 1528 1529 default: 1530 error = ENOPROTOOPT; 1531 break; 1532 } 1533 break; 1534 } 1535 } else { 1536 error = EINVAL; 1537 if (op == PRCO_SETOPT && *mp) 1538 (void)m_free(*mp); 1539 } 1540 return(error); 1541 } 1542 1543 /* 1544 * Set up IP6 options in pcb for insertion in output packets. 1545 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1546 * with destination address if source routed. 1547 */ 1548 static int 1549 ip6_pcbopts(pktopt, m, so) 1550 struct ip6_pktopts **pktopt; 1551 register struct mbuf *m; 1552 struct socket *so; 1553 { 1554 register struct ip6_pktopts *opt = *pktopt; 1555 int error = 0; 1556 struct proc *p = curproc; /* XXX */ 1557 int priv = 0; 1558 1559 /* turn off any old options. */ 1560 if (opt) { 1561 if (opt->ip6po_m) 1562 (void)m_free(opt->ip6po_m); 1563 } else 1564 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1565 *pktopt = 0; 1566 1567 if (!m || m->m_len == 0) { 1568 /* 1569 * Only turning off any previous options. 1570 */ 1571 if (opt) 1572 free(opt, M_IP6OPT); 1573 if (m) 1574 (void)m_free(m); 1575 return(0); 1576 } 1577 1578 /* set options specified by user. */ 1579 if (p && !suser(p->p_ucred, &p->p_acflag)) 1580 priv = 1; 1581 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1582 (void)m_free(m); 1583 return(error); 1584 } 1585 *pktopt = opt; 1586 return(0); 1587 } 1588 1589 /* 1590 * Set the IP6 multicast options in response to user setsockopt(). 1591 */ 1592 static int 1593 ip6_setmoptions(optname, im6op, m) 1594 int optname; 1595 struct ip6_moptions **im6op; 1596 struct mbuf *m; 1597 { 1598 int error = 0; 1599 u_int loop, ifindex; 1600 struct ipv6_mreq *mreq; 1601 struct ifnet *ifp; 1602 struct ip6_moptions *im6o = *im6op; 1603 struct route_in6 ro; 1604 struct sockaddr_in6 *dst; 1605 struct in6_multi_mship *imm; 1606 struct proc *p = curproc; /* XXX */ 1607 1608 if (im6o == NULL) { 1609 /* 1610 * No multicast option buffer attached to the pcb; 1611 * allocate one and initialize to default values. 1612 */ 1613 im6o = (struct ip6_moptions *) 1614 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1615 1616 if (im6o == NULL) 1617 return(ENOBUFS); 1618 *im6op = im6o; 1619 im6o->im6o_multicast_ifp = NULL; 1620 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1621 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1622 LIST_INIT(&im6o->im6o_memberships); 1623 } 1624 1625 switch (optname) { 1626 1627 case IPV6_MULTICAST_IF: 1628 /* 1629 * Select the interface for outgoing multicast packets. 1630 */ 1631 if (m == NULL || m->m_len != sizeof(u_int)) { 1632 error = EINVAL; 1633 break; 1634 } 1635 ifindex = *(mtod(m, u_int *)); 1636 if (ifindex < 0 || if_index < ifindex) { 1637 error = ENXIO; /* XXX EINVAL? */ 1638 break; 1639 } 1640 ifp = ifindex2ifnet[ifindex]; 1641 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1642 error = EADDRNOTAVAIL; 1643 break; 1644 } 1645 im6o->im6o_multicast_ifp = ifp; 1646 break; 1647 1648 case IPV6_MULTICAST_HOPS: 1649 { 1650 /* 1651 * Set the IP6 hoplimit for outgoing multicast packets. 1652 */ 1653 int optval; 1654 if (m == NULL || m->m_len != sizeof(int)) { 1655 error = EINVAL; 1656 break; 1657 } 1658 optval = *(mtod(m, u_int *)); 1659 if (optval < -1 || optval >= 256) 1660 error = EINVAL; 1661 else if (optval == -1) 1662 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1663 else 1664 im6o->im6o_multicast_hlim = optval; 1665 break; 1666 } 1667 1668 case IPV6_MULTICAST_LOOP: 1669 /* 1670 * Set the loopback flag for outgoing multicast packets. 1671 * Must be zero or one. 1672 */ 1673 if (m == NULL || m->m_len != sizeof(u_int) || 1674 (loop = *(mtod(m, u_int *))) > 1) { 1675 error = EINVAL; 1676 break; 1677 } 1678 im6o->im6o_multicast_loop = loop; 1679 break; 1680 1681 case IPV6_JOIN_GROUP: 1682 /* 1683 * Add a multicast group membership. 1684 * Group must be a valid IP6 multicast address. 1685 */ 1686 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1687 error = EINVAL; 1688 break; 1689 } 1690 mreq = mtod(m, struct ipv6_mreq *); 1691 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1692 /* 1693 * We use the unspecified address to specify to accept 1694 * all multicast addresses. Only super user is allowed 1695 * to do this. 1696 */ 1697 if (suser(p->p_ucred, &p->p_acflag)) { 1698 error = EACCES; 1699 break; 1700 } 1701 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1702 error = EINVAL; 1703 break; 1704 } 1705 1706 /* 1707 * If the interface is specified, validate it. 1708 */ 1709 if (mreq->ipv6mr_interface < 0 1710 || if_index < mreq->ipv6mr_interface) { 1711 error = ENXIO; /* XXX EINVAL? */ 1712 break; 1713 } 1714 /* 1715 * If no interface was explicitly specified, choose an 1716 * appropriate one according to the given multicast address. 1717 */ 1718 if (mreq->ipv6mr_interface == 0) { 1719 /* 1720 * If the multicast address is in node-local scope, 1721 * the interface should be a loopback interface. 1722 * Otherwise, look up the routing table for the 1723 * address, and choose the outgoing interface. 1724 * XXX: is it a good approach? 1725 */ 1726 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1727 ifp = &loif[0]; 1728 } else { 1729 ro.ro_rt = NULL; 1730 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1731 bzero(dst, sizeof(*dst)); 1732 dst->sin6_len = sizeof(struct sockaddr_in6); 1733 dst->sin6_family = AF_INET6; 1734 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1735 rtalloc((struct route *)&ro); 1736 if (ro.ro_rt == NULL) { 1737 error = EADDRNOTAVAIL; 1738 break; 1739 } 1740 ifp = ro.ro_rt->rt_ifp; 1741 rtfree(ro.ro_rt); 1742 } 1743 } else 1744 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1745 1746 /* 1747 * See if we found an interface, and confirm that it 1748 * supports multicast 1749 */ 1750 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1751 error = EADDRNOTAVAIL; 1752 break; 1753 } 1754 /* 1755 * Put interface index into the multicast address, 1756 * if the address has link-local scope. 1757 */ 1758 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1759 mreq->ipv6mr_multiaddr.s6_addr16[1] 1760 = htons(mreq->ipv6mr_interface); 1761 } 1762 /* 1763 * See if the membership already exists. 1764 */ 1765 for (imm = im6o->im6o_memberships.lh_first; 1766 imm != NULL; imm = imm->i6mm_chain.le_next) 1767 if (imm->i6mm_maddr->in6m_ifp == ifp && 1768 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1769 &mreq->ipv6mr_multiaddr)) 1770 break; 1771 if (imm != NULL) { 1772 error = EADDRINUSE; 1773 break; 1774 } 1775 /* 1776 * Everything looks good; add a new record to the multicast 1777 * address list for the given interface. 1778 */ 1779 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1780 if (imm == NULL) { 1781 error = ENOBUFS; 1782 break; 1783 } 1784 if ((imm->i6mm_maddr = 1785 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1786 free(imm, M_IPMADDR); 1787 break; 1788 } 1789 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1790 break; 1791 1792 case IPV6_LEAVE_GROUP: 1793 /* 1794 * Drop a multicast group membership. 1795 * Group must be a valid IP6 multicast address. 1796 */ 1797 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1798 error = EINVAL; 1799 break; 1800 } 1801 mreq = mtod(m, struct ipv6_mreq *); 1802 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1803 if (suser(p->p_ucred, &p->p_acflag)) { 1804 error = EACCES; 1805 break; 1806 } 1807 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1808 error = EINVAL; 1809 break; 1810 } 1811 /* 1812 * If an interface address was specified, get a pointer 1813 * to its ifnet structure. 1814 */ 1815 if (mreq->ipv6mr_interface < 0 1816 || if_index < mreq->ipv6mr_interface) { 1817 error = ENXIO; /* XXX EINVAL? */ 1818 break; 1819 } 1820 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1821 /* 1822 * Put interface index into the multicast address, 1823 * if the address has link-local scope. 1824 */ 1825 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1826 mreq->ipv6mr_multiaddr.s6_addr16[1] 1827 = htons(mreq->ipv6mr_interface); 1828 } 1829 /* 1830 * Find the membership in the membership list. 1831 */ 1832 for (imm = im6o->im6o_memberships.lh_first; 1833 imm != NULL; imm = imm->i6mm_chain.le_next) { 1834 if ((ifp == NULL || 1835 imm->i6mm_maddr->in6m_ifp == ifp) && 1836 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1837 &mreq->ipv6mr_multiaddr)) 1838 break; 1839 } 1840 if (imm == NULL) { 1841 /* Unable to resolve interface */ 1842 error = EADDRNOTAVAIL; 1843 break; 1844 } 1845 /* 1846 * Give up the multicast address record to which the 1847 * membership points. 1848 */ 1849 LIST_REMOVE(imm, i6mm_chain); 1850 in6_delmulti(imm->i6mm_maddr); 1851 free(imm, M_IPMADDR); 1852 break; 1853 1854 default: 1855 error = EOPNOTSUPP; 1856 break; 1857 } 1858 1859 /* 1860 * If all options have default values, no need to keep the mbuf. 1861 */ 1862 if (im6o->im6o_multicast_ifp == NULL && 1863 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1864 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1865 im6o->im6o_memberships.lh_first == NULL) { 1866 free(*im6op, M_IPMOPTS); 1867 *im6op = NULL; 1868 } 1869 1870 return(error); 1871 } 1872 1873 /* 1874 * Return the IP6 multicast options in response to user getsockopt(). 1875 */ 1876 static int 1877 ip6_getmoptions(optname, im6o, mp) 1878 int optname; 1879 register struct ip6_moptions *im6o; 1880 register struct mbuf **mp; 1881 { 1882 u_int *hlim, *loop, *ifindex; 1883 1884 *mp = m_get(M_WAIT, MT_SOOPTS); 1885 1886 switch (optname) { 1887 1888 case IPV6_MULTICAST_IF: 1889 ifindex = mtod(*mp, u_int *); 1890 (*mp)->m_len = sizeof(u_int); 1891 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1892 *ifindex = 0; 1893 else 1894 *ifindex = im6o->im6o_multicast_ifp->if_index; 1895 return(0); 1896 1897 case IPV6_MULTICAST_HOPS: 1898 hlim = mtod(*mp, u_int *); 1899 (*mp)->m_len = sizeof(u_int); 1900 if (im6o == NULL) 1901 *hlim = ip6_defmcasthlim; 1902 else 1903 *hlim = im6o->im6o_multicast_hlim; 1904 return(0); 1905 1906 case IPV6_MULTICAST_LOOP: 1907 loop = mtod(*mp, u_int *); 1908 (*mp)->m_len = sizeof(u_int); 1909 if (im6o == NULL) 1910 *loop = ip6_defmcasthlim; 1911 else 1912 *loop = im6o->im6o_multicast_loop; 1913 return(0); 1914 1915 default: 1916 return(EOPNOTSUPP); 1917 } 1918 } 1919 1920 /* 1921 * Discard the IP6 multicast options. 1922 */ 1923 void 1924 ip6_freemoptions(im6o) 1925 register struct ip6_moptions *im6o; 1926 { 1927 struct in6_multi_mship *imm; 1928 1929 if (im6o == NULL) 1930 return; 1931 1932 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1933 LIST_REMOVE(imm, i6mm_chain); 1934 if (imm->i6mm_maddr) 1935 in6_delmulti(imm->i6mm_maddr); 1936 free(imm, M_IPMADDR); 1937 } 1938 free(im6o, M_IPMOPTS); 1939 } 1940 1941 /* 1942 * Set IPv6 outgoing packet options based on advanced API. 1943 */ 1944 int 1945 ip6_setpktoptions(control, opt, priv) 1946 struct mbuf *control; 1947 struct ip6_pktopts *opt; 1948 int priv; 1949 { 1950 register struct cmsghdr *cm = 0; 1951 1952 if (control == 0 || opt == 0) 1953 return(EINVAL); 1954 1955 bzero(opt, sizeof(*opt)); 1956 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1957 1958 /* 1959 * XXX: Currently, we assume all the optional information is stored 1960 * in a single mbuf. 1961 */ 1962 if (control->m_next) 1963 return(EINVAL); 1964 1965 opt->ip6po_m = control; 1966 1967 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1968 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1969 cm = mtod(control, struct cmsghdr *); 1970 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1971 return(EINVAL); 1972 if (cm->cmsg_level != IPPROTO_IPV6) 1973 continue; 1974 1975 switch(cm->cmsg_type) { 1976 case IPV6_PKTINFO: 1977 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1978 return(EINVAL); 1979 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1980 if (opt->ip6po_pktinfo->ipi6_ifindex && 1981 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1982 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1983 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1984 1985 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1986 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1987 return(ENXIO); 1988 } 1989 1990 /* 1991 * Check if the requested source address is indeed a 1992 * unicast address assigned to the node. 1993 */ 1994 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 1995 struct ifaddr *ia; 1996 struct sockaddr_in6 sin6; 1997 1998 bzero(&sin6, sizeof(sin6)); 1999 sin6.sin6_len = sizeof(sin6); 2000 sin6.sin6_family = AF_INET6; 2001 sin6.sin6_addr = 2002 opt->ip6po_pktinfo->ipi6_addr; 2003 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2004 if (ia == NULL || 2005 (opt->ip6po_pktinfo->ipi6_ifindex && 2006 (ia->ifa_ifp->if_index != 2007 opt->ip6po_pktinfo->ipi6_ifindex))) { 2008 return(EADDRNOTAVAIL); 2009 } 2010 /* 2011 * Check if the requested source address is 2012 * indeed a unicast address assigned to the 2013 * node. 2014 */ 2015 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2016 return(EADDRNOTAVAIL); 2017 } 2018 break; 2019 2020 case IPV6_HOPLIMIT: 2021 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2022 return(EINVAL); 2023 2024 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2025 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2026 return(EINVAL); 2027 break; 2028 2029 case IPV6_NEXTHOP: 2030 if (!priv) 2031 return(EPERM); 2032 2033 if (cm->cmsg_len < sizeof(u_char) || 2034 /* check if cmsg_len is large enough for sa_len */ 2035 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2036 return(EINVAL); 2037 2038 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2039 2040 break; 2041 2042 case IPV6_HOPOPTS: 2043 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2044 return(EINVAL); 2045 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2046 if (cm->cmsg_len != 2047 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2048 return(EINVAL); 2049 break; 2050 2051 case IPV6_DSTOPTS: 2052 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2053 return(EINVAL); 2054 2055 /* 2056 * If there is no routing header yet, the destination 2057 * options header should be put on the 1st part. 2058 * Otherwise, the header should be on the 2nd part. 2059 * (See RFC 2460, section 4.1) 2060 */ 2061 if (opt->ip6po_rthdr == NULL) { 2062 opt->ip6po_dest1 = 2063 (struct ip6_dest *)CMSG_DATA(cm); 2064 if (cm->cmsg_len != 2065 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2066 << 3)) 2067 return(EINVAL); 2068 } 2069 else { 2070 opt->ip6po_dest2 = 2071 (struct ip6_dest *)CMSG_DATA(cm); 2072 if (cm->cmsg_len != 2073 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2074 << 3)) 2075 return(EINVAL); 2076 } 2077 break; 2078 2079 case IPV6_RTHDR: 2080 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2081 return(EINVAL); 2082 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2083 if (cm->cmsg_len != 2084 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2085 return(EINVAL); 2086 switch(opt->ip6po_rthdr->ip6r_type) { 2087 case IPV6_RTHDR_TYPE_0: 2088 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2089 return(EINVAL); 2090 break; 2091 default: 2092 return(EINVAL); 2093 } 2094 break; 2095 2096 default: 2097 return(ENOPROTOOPT); 2098 } 2099 } 2100 2101 return(0); 2102 } 2103 2104 /* 2105 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2106 * packet to the input queue of a specified interface. Note that this 2107 * calls the output routine of the loopback "driver", but with an interface 2108 * pointer that might NOT be &loif -- easier than replicating that code here. 2109 */ 2110 void 2111 ip6_mloopback(ifp, m, dst) 2112 struct ifnet *ifp; 2113 register struct mbuf *m; 2114 register struct sockaddr_in6 *dst; 2115 { 2116 struct mbuf *copym; 2117 struct ip6_hdr *ip6; 2118 2119 copym = m_copy(m, 0, M_COPYALL); 2120 if (copym == NULL) 2121 return; 2122 2123 /* 2124 * Make sure to deep-copy IPv6 header portion in case the data 2125 * is in an mbuf cluster, so that we can safely override the IPv6 2126 * header portion later. 2127 */ 2128 if ((copym->m_flags & M_EXT) != 0 || 2129 copym->m_len < sizeof(struct ip6_hdr)) { 2130 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2131 if (copym == NULL) 2132 return; 2133 } 2134 2135 #ifdef DIAGNOSTIC 2136 if (copym->m_len < sizeof(*ip6)) { 2137 m_freem(copym); 2138 return; 2139 } 2140 #endif 2141 2142 #ifndef FAKE_LOOPBACK_IF 2143 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 2144 #else 2145 if (1) 2146 #endif 2147 { 2148 ip6 = mtod(copym, struct ip6_hdr *); 2149 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2150 ip6->ip6_src.s6_addr16[1] = 0; 2151 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2152 ip6->ip6_dst.s6_addr16[1] = 0; 2153 } 2154 2155 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2156 } 2157 2158 /* 2159 * Chop IPv6 header off from the payload. 2160 */ 2161 static int 2162 ip6_splithdr(m, exthdrs) 2163 struct mbuf *m; 2164 struct ip6_exthdrs *exthdrs; 2165 { 2166 struct mbuf *mh; 2167 struct ip6_hdr *ip6; 2168 2169 ip6 = mtod(m, struct ip6_hdr *); 2170 if (m->m_len > sizeof(*ip6)) { 2171 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2172 if (mh == 0) { 2173 m_freem(m); 2174 return ENOBUFS; 2175 } 2176 M_COPY_PKTHDR(mh, m); 2177 MH_ALIGN(mh, sizeof(*ip6)); 2178 m->m_flags &= ~M_PKTHDR; 2179 m->m_len -= sizeof(*ip6); 2180 m->m_data += sizeof(*ip6); 2181 mh->m_next = m; 2182 m = mh; 2183 m->m_len = sizeof(*ip6); 2184 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2185 } 2186 exthdrs->ip6e_ip6 = m; 2187 return 0; 2188 } 2189 2190 /* 2191 * Compute IPv6 extension header length. 2192 */ 2193 int 2194 ip6_optlen(in6p) 2195 struct in6pcb *in6p; 2196 { 2197 int len; 2198 2199 if (!in6p->in6p_outputopts) 2200 return 0; 2201 2202 len = 0; 2203 #define elen(x) \ 2204 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2205 2206 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2207 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2208 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2209 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2210 return len; 2211 #undef elen 2212 } 2213
Indexes created Tue Sep 30 20:09:53 GMT 2025