ip6_output.c revision 1.44.4.2
1 /* $NetBSD: ip6_output.c,v 1.44.4.2 2002/10/13 22:39:05 lukem 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. 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 <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.44.4.2 2002/10/13 22:39:05 lukem Exp $"); 70 71 #include "opt_inet.h" 72 #include "opt_ipsec.h" 73 #include "opt_pfil_hooks.h" 74 75 #include <sys/param.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/errno.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/systm.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #ifdef PFIL_HOOKS 88 #include <net/pfil.h> 89 #endif 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/in6_pcb.h> 97 #include <netinet6/nd6.h> 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #include <netkey/key.h> 102 #endif /* IPSEC */ 103 104 #include "loop.h" 105 106 #include <net/net_osdep.h> 107 108 #ifdef PFIL_HOOKS 109 extern struct pfil_head inet6_pfil_hook; /* XXX */ 110 #endif 111 112 struct ip6_exthdrs { 113 struct mbuf *ip6e_ip6; 114 struct mbuf *ip6e_hbh; 115 struct mbuf *ip6e_dest1; 116 struct mbuf *ip6e_rthdr; 117 struct mbuf *ip6e_dest2; 118 }; 119 120 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 121 struct socket *)); 122 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 123 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 124 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 125 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 126 struct ip6_frag **)); 127 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 128 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 129 130 extern struct ifnet loif[NLOOP]; 131 132 /* 133 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 134 * header (with pri, len, nxt, hlim, src, dst). 135 * This function may modify ver and hlim only. 136 * The mbuf chain containing the packet will be freed. 137 * The mbuf opt, if present, will not be freed. 138 */ 139 int 140 ip6_output(m0, opt, ro, flags, im6o, ifpp) 141 struct mbuf *m0; 142 struct ip6_pktopts *opt; 143 struct route_in6 *ro; 144 int flags; 145 struct ip6_moptions *im6o; 146 struct ifnet **ifpp; /* XXX: just for statistics */ 147 { 148 struct ip6_hdr *ip6, *mhip6; 149 struct ifnet *ifp, *origifp; 150 struct mbuf *m = m0; 151 int hlen, tlen, len, off; 152 struct route_in6 ip6route; 153 struct sockaddr_in6 *dst; 154 int error = 0; 155 struct in6_ifaddr *ia; 156 u_long mtu; 157 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 158 struct ip6_exthdrs exthdrs; 159 struct in6_addr finaldst; 160 struct route_in6 *ro_pmtu = NULL; 161 int hdrsplit = 0; 162 int needipsec = 0; 163 #ifdef IPSEC 164 int needipsectun = 0; 165 struct socket *so; 166 struct secpolicy *sp = NULL; 167 168 /* for AH processing. stupid to have "socket" variable in IP layer... */ 169 so = ipsec_getsocket(m); 170 (void)ipsec_setsocket(m, NULL); 171 ip6 = mtod(m, struct ip6_hdr *); 172 #endif /* IPSEC */ 173 174 #define MAKE_EXTHDR(hp, mp) \ 175 do { \ 176 if (hp) { \ 177 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 178 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 179 ((eh)->ip6e_len + 1) << 3); \ 180 if (error) \ 181 goto freehdrs; \ 182 } \ 183 } while (0) 184 185 bzero(&exthdrs, sizeof(exthdrs)); 186 if (opt) { 187 /* Hop-by-Hop options header */ 188 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 189 /* Destination options header(1st part) */ 190 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 191 /* Routing header */ 192 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 193 /* Destination options header(2nd part) */ 194 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 195 } 196 197 #ifdef IPSEC 198 /* get a security policy for this packet */ 199 if (so == NULL) 200 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 201 else 202 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 203 204 if (sp == NULL) { 205 ipsec6stat.out_inval++; 206 goto freehdrs; 207 } 208 209 error = 0; 210 211 /* check policy */ 212 switch (sp->policy) { 213 case IPSEC_POLICY_DISCARD: 214 /* 215 * This packet is just discarded. 216 */ 217 ipsec6stat.out_polvio++; 218 goto freehdrs; 219 220 case IPSEC_POLICY_BYPASS: 221 case IPSEC_POLICY_NONE: 222 /* no need to do IPsec. */ 223 needipsec = 0; 224 break; 225 226 case IPSEC_POLICY_IPSEC: 227 if (sp->req == NULL) { 228 /* XXX should be panic ? */ 229 printf("ip6_output: No IPsec request specified.\n"); 230 error = EINVAL; 231 goto freehdrs; 232 } 233 needipsec = 1; 234 break; 235 236 case IPSEC_POLICY_ENTRUST: 237 default: 238 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 239 } 240 #endif /* IPSEC */ 241 242 /* 243 * Calculate the total length of the extension header chain. 244 * Keep the length of the unfragmentable part for fragmentation. 245 */ 246 optlen = 0; 247 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 248 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 249 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 250 unfragpartlen = optlen + sizeof(struct ip6_hdr); 251 /* NOTE: we don't add AH/ESP length here. do that later. */ 252 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 253 254 /* 255 * If we need IPsec, or there is at least one extension header, 256 * separate IP6 header from the payload. 257 */ 258 if ((needipsec || optlen) && !hdrsplit) { 259 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 260 m = NULL; 261 goto freehdrs; 262 } 263 m = exthdrs.ip6e_ip6; 264 hdrsplit++; 265 } 266 267 /* adjust pointer */ 268 ip6 = mtod(m, struct ip6_hdr *); 269 270 /* adjust mbuf packet header length */ 271 m->m_pkthdr.len += optlen; 272 plen = m->m_pkthdr.len - sizeof(*ip6); 273 274 /* If this is a jumbo payload, insert a jumbo payload option. */ 275 if (plen > IPV6_MAXPACKET) { 276 if (!hdrsplit) { 277 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 278 m = NULL; 279 goto freehdrs; 280 } 281 m = exthdrs.ip6e_ip6; 282 hdrsplit++; 283 } 284 /* adjust pointer */ 285 ip6 = mtod(m, struct ip6_hdr *); 286 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 287 goto freehdrs; 288 ip6->ip6_plen = 0; 289 } else 290 ip6->ip6_plen = htons(plen); 291 292 /* 293 * Concatenate headers and fill in next header fields. 294 * Here we have, on "m" 295 * IPv6 payload 296 * and we insert headers accordingly. Finally, we should be getting: 297 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 298 * 299 * during the header composing process, "m" points to IPv6 header. 300 * "mprev" points to an extension header prior to esp. 301 */ 302 { 303 u_char *nexthdrp = &ip6->ip6_nxt; 304 struct mbuf *mprev = m; 305 306 /* 307 * we treat dest2 specially. this makes IPsec processing 308 * much easier. 309 * 310 * result: IPv6 dest2 payload 311 * m and mprev will point to IPv6 header. 312 */ 313 if (exthdrs.ip6e_dest2) { 314 if (!hdrsplit) 315 panic("assumption failed: hdr not split"); 316 exthdrs.ip6e_dest2->m_next = m->m_next; 317 m->m_next = exthdrs.ip6e_dest2; 318 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 319 ip6->ip6_nxt = IPPROTO_DSTOPTS; 320 } 321 322 #define MAKE_CHAIN(m, mp, p, i)\ 323 do {\ 324 if (m) {\ 325 if (!hdrsplit) \ 326 panic("assumption failed: hdr not split"); \ 327 *mtod((m), u_char *) = *(p);\ 328 *(p) = (i);\ 329 p = mtod((m), u_char *);\ 330 (m)->m_next = (mp)->m_next;\ 331 (mp)->m_next = (m);\ 332 (mp) = (m);\ 333 }\ 334 } while (0) 335 /* 336 * result: IPv6 hbh dest1 rthdr dest2 payload 337 * m will point to IPv6 header. mprev will point to the 338 * extension header prior to dest2 (rthdr in the above case). 339 */ 340 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 341 nexthdrp, IPPROTO_HOPOPTS); 342 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 343 nexthdrp, IPPROTO_DSTOPTS); 344 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 345 nexthdrp, IPPROTO_ROUTING); 346 347 #ifdef IPSEC 348 if (!needipsec) 349 goto skip_ipsec2; 350 351 /* 352 * pointers after IPsec headers are not valid any more. 353 * other pointers need a great care too. 354 * (IPsec routines should not mangle mbufs prior to AH/ESP) 355 */ 356 exthdrs.ip6e_dest2 = NULL; 357 358 { 359 struct ip6_rthdr *rh = NULL; 360 int segleft_org = 0; 361 struct ipsec_output_state state; 362 363 if (exthdrs.ip6e_rthdr) { 364 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 365 segleft_org = rh->ip6r_segleft; 366 rh->ip6r_segleft = 0; 367 } 368 369 bzero(&state, sizeof(state)); 370 state.m = m; 371 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 372 &needipsectun); 373 m = state.m; 374 if (error) { 375 /* mbuf is already reclaimed in ipsec6_output_trans. */ 376 m = NULL; 377 switch (error) { 378 case EHOSTUNREACH: 379 case ENETUNREACH: 380 case EMSGSIZE: 381 case ENOBUFS: 382 case ENOMEM: 383 break; 384 default: 385 printf("ip6_output (ipsec): error code %d\n", error); 386 /* fall through */ 387 case ENOENT: 388 /* don't show these error codes to the user */ 389 error = 0; 390 break; 391 } 392 goto bad; 393 } 394 if (exthdrs.ip6e_rthdr) { 395 /* ah6_output doesn't modify mbuf chain */ 396 rh->ip6r_segleft = segleft_org; 397 } 398 } 399 skip_ipsec2:; 400 #endif 401 } 402 403 /* 404 * If there is a routing header, replace destination address field 405 * with the first hop of the routing header. 406 */ 407 if (exthdrs.ip6e_rthdr) { 408 struct ip6_rthdr *rh = 409 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 410 struct ip6_rthdr *)); 411 struct ip6_rthdr0 *rh0; 412 413 finaldst = ip6->ip6_dst; 414 switch (rh->ip6r_type) { 415 case IPV6_RTHDR_TYPE_0: 416 rh0 = (struct ip6_rthdr0 *)rh; 417 ip6->ip6_dst = rh0->ip6r0_addr[0]; 418 bcopy((caddr_t)&rh0->ip6r0_addr[1], 419 (caddr_t)&rh0->ip6r0_addr[0], 420 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1) 421 ); 422 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 423 break; 424 default: /* is it possible? */ 425 error = EINVAL; 426 goto bad; 427 } 428 } 429 430 /* Source address validation */ 431 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 432 (flags & IPV6_DADOUTPUT) == 0) { 433 error = EOPNOTSUPP; 434 ip6stat.ip6s_badscope++; 435 goto bad; 436 } 437 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 438 error = EOPNOTSUPP; 439 ip6stat.ip6s_badscope++; 440 goto bad; 441 } 442 443 ip6stat.ip6s_localout++; 444 445 /* 446 * Route packet. 447 */ 448 if (ro == 0) { 449 ro = &ip6route; 450 bzero((caddr_t)ro, sizeof(*ro)); 451 } 452 ro_pmtu = ro; 453 if (opt && opt->ip6po_rthdr) 454 ro = &opt->ip6po_route; 455 dst = (struct sockaddr_in6 *)&ro->ro_dst; 456 /* 457 * If there is a cached route, 458 * check that it is to the same destination 459 * and is still up. If not, free it and try again. 460 */ 461 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 462 dst->sin6_family != AF_INET6 || 463 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 464 RTFREE(ro->ro_rt); 465 ro->ro_rt = (struct rtentry *)0; 466 } 467 if (ro->ro_rt == 0) { 468 bzero(dst, sizeof(*dst)); 469 dst->sin6_family = AF_INET6; 470 dst->sin6_len = sizeof(struct sockaddr_in6); 471 dst->sin6_addr = ip6->ip6_dst; 472 } 473 #ifdef IPSEC 474 if (needipsec && needipsectun) { 475 struct ipsec_output_state state; 476 477 /* 478 * All the extension headers will become inaccessible 479 * (since they can be encrypted). 480 * Don't panic, we need no more updates to extension headers 481 * on inner IPv6 packet (since they are now encapsulated). 482 * 483 * IPv6 [ESP|AH] IPv6 [extension headers] payload 484 */ 485 bzero(&exthdrs, sizeof(exthdrs)); 486 exthdrs.ip6e_ip6 = m; 487 488 bzero(&state, sizeof(state)); 489 state.m = m; 490 state.ro = (struct route *)ro; 491 state.dst = (struct sockaddr *)dst; 492 493 error = ipsec6_output_tunnel(&state, sp, flags); 494 495 m = state.m; 496 ro = (struct route_in6 *)state.ro; 497 dst = (struct sockaddr_in6 *)state.dst; 498 if (error) { 499 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 500 m0 = m = NULL; 501 m = NULL; 502 switch (error) { 503 case EHOSTUNREACH: 504 case ENETUNREACH: 505 case EMSGSIZE: 506 case ENOBUFS: 507 case ENOMEM: 508 break; 509 default: 510 printf("ip6_output (ipsec): error code %d\n", error); 511 /* fall through */ 512 case ENOENT: 513 /* don't show these error codes to the user */ 514 error = 0; 515 break; 516 } 517 goto bad; 518 } 519 520 exthdrs.ip6e_ip6 = m; 521 } 522 #endif /* IPSEC */ 523 524 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 525 /* Unicast */ 526 527 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 528 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 529 /* xxx 530 * interface selection comes here 531 * if an interface is specified from an upper layer, 532 * ifp must point it. 533 */ 534 if (ro->ro_rt == 0) { 535 /* 536 * non-bsdi always clone routes, if parent is 537 * PRF_CLONING. 538 */ 539 rtalloc((struct route *)ro); 540 } 541 if (ro->ro_rt == 0) { 542 ip6stat.ip6s_noroute++; 543 error = EHOSTUNREACH; 544 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 545 goto bad; 546 } 547 ia = ifatoia6(ro->ro_rt->rt_ifa); 548 ifp = ro->ro_rt->rt_ifp; 549 ro->ro_rt->rt_use++; 550 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 551 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 552 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 553 554 in6_ifstat_inc(ifp, ifs6_out_request); 555 556 /* 557 * Check if the outgoing interface conflicts with 558 * the interface specified by ifi6_ifindex (if specified). 559 * Note that loopback interface is always okay. 560 * (this may happen when we are sending a packet to one of 561 * our own addresses.) 562 */ 563 if (opt && opt->ip6po_pktinfo 564 && opt->ip6po_pktinfo->ipi6_ifindex) { 565 if (!(ifp->if_flags & IFF_LOOPBACK) 566 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 567 ip6stat.ip6s_noroute++; 568 in6_ifstat_inc(ifp, ifs6_out_discard); 569 error = EHOSTUNREACH; 570 goto bad; 571 } 572 } 573 574 if (opt && opt->ip6po_hlim != -1) 575 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 576 } else { 577 /* Multicast */ 578 struct in6_multi *in6m; 579 580 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 581 582 /* 583 * See if the caller provided any multicast options 584 */ 585 ifp = NULL; 586 if (im6o != NULL) { 587 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 588 if (im6o->im6o_multicast_ifp != NULL) 589 ifp = im6o->im6o_multicast_ifp; 590 } else 591 ip6->ip6_hlim = ip6_defmcasthlim; 592 593 /* 594 * See if the caller provided the outgoing interface 595 * as an ancillary data. 596 * Boundary check for ifindex is assumed to be already done. 597 */ 598 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 599 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 600 601 /* 602 * If the destination is a node-local scope multicast, 603 * the packet should be loop-backed only. 604 */ 605 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 606 /* 607 * If the outgoing interface is already specified, 608 * it should be a loopback interface. 609 */ 610 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 611 ip6stat.ip6s_badscope++; 612 error = ENETUNREACH; /* XXX: better error? */ 613 /* XXX correct ifp? */ 614 in6_ifstat_inc(ifp, ifs6_out_discard); 615 goto bad; 616 } else { 617 ifp = &loif[0]; 618 } 619 } 620 621 if (opt && opt->ip6po_hlim != -1) 622 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 623 624 /* 625 * If caller did not provide an interface lookup a 626 * default in the routing table. This is either a 627 * default for the speicfied group (i.e. a host 628 * route), or a multicast default (a route for the 629 * ``net'' ff00::/8). 630 */ 631 if (ifp == NULL) { 632 if (ro->ro_rt == 0) { 633 ro->ro_rt = rtalloc1((struct sockaddr *) 634 &ro->ro_dst, 0 635 ); 636 } 637 if (ro->ro_rt == 0) { 638 ip6stat.ip6s_noroute++; 639 error = EHOSTUNREACH; 640 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 641 goto bad; 642 } 643 ia = ifatoia6(ro->ro_rt->rt_ifa); 644 ifp = ro->ro_rt->rt_ifp; 645 ro->ro_rt->rt_use++; 646 } 647 648 if ((flags & IPV6_FORWARDING) == 0) 649 in6_ifstat_inc(ifp, ifs6_out_request); 650 in6_ifstat_inc(ifp, ifs6_out_mcast); 651 652 /* 653 * Confirm that the outgoing interface supports multicast. 654 */ 655 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 656 ip6stat.ip6s_noroute++; 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 error = ENETUNREACH; 659 goto bad; 660 } 661 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 662 if (in6m != NULL && 663 (im6o == NULL || im6o->im6o_multicast_loop)) { 664 /* 665 * If we belong to the destination multicast group 666 * on the outgoing interface, and the caller did not 667 * forbid loopback, loop back a copy. 668 */ 669 ip6_mloopback(ifp, m, dst); 670 } else { 671 /* 672 * If we are acting as a multicast router, perform 673 * multicast forwarding as if the packet had just 674 * arrived on the interface to which we are about 675 * to send. The multicast forwarding function 676 * recursively calls this function, using the 677 * IPV6_FORWARDING flag to prevent infinite recursion. 678 * 679 * Multicasts that are looped back by ip6_mloopback(), 680 * above, will be forwarded by the ip6_input() routine, 681 * if necessary. 682 */ 683 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 684 if (ip6_mforward(ip6, ifp, m) != 0) { 685 m_freem(m); 686 goto done; 687 } 688 } 689 } 690 /* 691 * Multicasts with a hoplimit of zero may be looped back, 692 * above, but must not be transmitted on a network. 693 * Also, multicasts addressed to the loopback interface 694 * are not sent -- the above call to ip6_mloopback() will 695 * loop back a copy if this host actually belongs to the 696 * destination group on the loopback interface. 697 */ 698 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 699 m_freem(m); 700 goto done; 701 } 702 } 703 704 /* 705 * Fill the outgoing inteface to tell the upper layer 706 * to increment per-interface statistics. 707 */ 708 if (ifpp) 709 *ifpp = ifp; 710 711 /* 712 * Determine path MTU. 713 */ 714 if (ro_pmtu != ro) { 715 /* The first hop and the final destination may differ. */ 716 struct sockaddr_in6 *sin6_fin = 717 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 718 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 719 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 720 &finaldst))) { 721 RTFREE(ro_pmtu->ro_rt); 722 ro_pmtu->ro_rt = (struct rtentry *)0; 723 } 724 if (ro_pmtu->ro_rt == 0) { 725 bzero(sin6_fin, sizeof(*sin6_fin)); 726 sin6_fin->sin6_family = AF_INET6; 727 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 728 sin6_fin->sin6_addr = finaldst; 729 730 rtalloc((struct route *)ro_pmtu); 731 } 732 } 733 if (ro_pmtu->ro_rt != NULL) { 734 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 735 736 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 737 if (mtu == 0) 738 mtu = ifmtu; 739 else 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 * if MTU on the route is 0, we need to fix the MTU. 749 * this case happens with path MTU discovery timeouts. 750 */ 751 mtu = ifmtu; 752 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 753 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 754 } 755 } else { 756 mtu = nd_ifinfo[ifp->if_index].linkmtu; 757 } 758 759 if (mtu > IPV6_MMTU && 760 (flags & IPV6_MINMTU)) { 761 mtu = IPV6_MMTU; 762 } 763 764 /* Fake scoped addresses */ 765 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 766 /* 767 * If source or destination address is a scoped address, and 768 * the packet is going to be sent to a loopback interface, 769 * we should keep the original interface. 770 */ 771 772 /* 773 * XXX: this is a very experimental and temporary solution. 774 * We eventually have sockaddr_in6 and use the sin6_scope_id 775 * field of the structure here. 776 * We rely on the consistency between two scope zone ids 777 * of source add destination, which should already be assured 778 * Larger scopes than link will be supported in the near 779 * future. 780 */ 781 origifp = NULL; 782 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 783 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 784 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 785 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 786 /* 787 * XXX: origifp can be NULL even in those two cases above. 788 * For example, if we remove the (only) link-local address 789 * from the loopback interface, and try to send a link-local 790 * address without link-id information. Then the source 791 * address is ::1, and the destination address is the 792 * link-local address with its s6_addr16[1] being zero. 793 * What is worse, if the packet goes to the loopback interface 794 * by a default rejected route, the null pointer would be 795 * passed to looutput, and the kernel would hang. 796 * The following last resort would prevent such disaster. 797 */ 798 if (origifp == NULL) 799 origifp = ifp; 800 } 801 else 802 origifp = ifp; 803 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 804 ip6->ip6_src.s6_addr16[1] = 0; 805 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 806 ip6->ip6_dst.s6_addr16[1] = 0; 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, 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 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, 844 PFIL_OUT)) != 0) 845 goto done; 846 if (m == NULL) 847 goto done; 848 ip6 = mtod(m, struct ip6_hdr *); 849 #endif /* PFIL_HOOKS */ 850 /* 851 * Send the packet to the outgoing interface. 852 * If necessary, do IPv6 fragmentation before sending. 853 */ 854 tlen = m->m_pkthdr.len; 855 if (tlen <= mtu 856 #ifdef notyet 857 /* 858 * On any link that cannot convey a 1280-octet packet in one piece, 859 * link-specific fragmentation and reassembly must be provided at 860 * a layer below IPv6. [RFC 2460, sec.5] 861 * Thus if the interface has ability of link-level fragmentation, 862 * we can just send the packet even if the packet size is 863 * larger than the link's MTU. 864 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 865 */ 866 867 || ifp->if_flags & IFF_FRAGMENTABLE 868 #endif 869 ) 870 { 871 #ifdef IFA_STATS 872 struct in6_ifaddr *ia6; 873 ip6 = mtod(m, struct ip6_hdr *); 874 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 875 if (ia6) { 876 /* Record statistics for this interface address. */ 877 ia6->ia_ifa.ifa_data.ifad_outbytes += 878 m->m_pkthdr.len; 879 } 880 #endif 881 #ifdef IPSEC 882 /* clean ipsec history once it goes out of the node */ 883 ipsec_delaux(m); 884 #endif 885 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 886 goto done; 887 } else if (mtu < IPV6_MMTU) { 888 /* 889 * note that path MTU is never less than IPV6_MMTU 890 * (see icmp6_input). 891 */ 892 error = EMSGSIZE; 893 in6_ifstat_inc(ifp, ifs6_out_fragfail); 894 goto bad; 895 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 896 error = EMSGSIZE; 897 in6_ifstat_inc(ifp, ifs6_out_fragfail); 898 goto bad; 899 } else { 900 struct mbuf **mnext, *m_frgpart; 901 struct ip6_frag *ip6f; 902 u_int32_t id = htonl(ip6_id++); 903 u_char nextproto; 904 905 /* 906 * Too large for the destination or interface; 907 * fragment if possible. 908 * Must be able to put at least 8 bytes per fragment. 909 */ 910 hlen = unfragpartlen; 911 if (mtu > IPV6_MAXPACKET) 912 mtu = IPV6_MAXPACKET; 913 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 914 if (len < 8) { 915 error = EMSGSIZE; 916 in6_ifstat_inc(ifp, ifs6_out_fragfail); 917 goto bad; 918 } 919 920 mnext = &m->m_nextpkt; 921 922 /* 923 * Change the next header field of the last header in the 924 * unfragmentable part. 925 */ 926 if (exthdrs.ip6e_rthdr) { 927 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 928 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 929 } else if (exthdrs.ip6e_dest1) { 930 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 931 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 932 } else if (exthdrs.ip6e_hbh) { 933 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 934 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 935 } else { 936 nextproto = ip6->ip6_nxt; 937 ip6->ip6_nxt = IPPROTO_FRAGMENT; 938 } 939 940 /* 941 * Loop through length of segment after first fragment, 942 * make new header and copy data of each part and link onto 943 * chain. 944 */ 945 m0 = m; 946 for (off = hlen; off < tlen; off += len) { 947 MGETHDR(m, M_DONTWAIT, MT_HEADER); 948 if (!m) { 949 error = ENOBUFS; 950 ip6stat.ip6s_odropped++; 951 goto sendorfree; 952 } 953 m->m_flags = m0->m_flags & M_COPYFLAGS; 954 *mnext = m; 955 mnext = &m->m_nextpkt; 956 m->m_data += max_linkhdr; 957 mhip6 = mtod(m, struct ip6_hdr *); 958 *mhip6 = *ip6; 959 m->m_len = sizeof(*mhip6); 960 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 961 if (error) { 962 ip6stat.ip6s_odropped++; 963 goto sendorfree; 964 } 965 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 966 if (off + len >= tlen) 967 len = tlen - off; 968 else 969 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 970 mhip6->ip6_plen = htons((u_short)(len + hlen + 971 sizeof(*ip6f) - 972 sizeof(struct ip6_hdr))); 973 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 974 error = ENOBUFS; 975 ip6stat.ip6s_odropped++; 976 goto sendorfree; 977 } 978 m_cat(m, m_frgpart); 979 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 980 m->m_pkthdr.rcvif = (struct ifnet *)0; 981 ip6f->ip6f_reserved = 0; 982 ip6f->ip6f_ident = id; 983 ip6f->ip6f_nxt = nextproto; 984 ip6stat.ip6s_ofragments++; 985 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 986 } 987 988 in6_ifstat_inc(ifp, ifs6_out_fragok); 989 } 990 991 /* 992 * Remove leading garbages. 993 */ 994 sendorfree: 995 m = m0->m_nextpkt; 996 m0->m_nextpkt = 0; 997 m_freem(m0); 998 for (m0 = m; m; m = m0) { 999 m0 = m->m_nextpkt; 1000 m->m_nextpkt = 0; 1001 if (error == 0) { 1002 #ifdef IFA_STATS 1003 struct in6_ifaddr *ia6; 1004 ip6 = mtod(m, struct ip6_hdr *); 1005 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1006 if (ia6) { 1007 /* 1008 * Record statistics for this interface 1009 * address. 1010 */ 1011 ia6->ia_ifa.ifa_data.ifad_outbytes += 1012 m->m_pkthdr.len; 1013 } 1014 #endif 1015 #ifdef IPSEC 1016 /* clean ipsec history once it goes out of the node */ 1017 ipsec_delaux(m); 1018 #endif 1019 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1020 } else 1021 m_freem(m); 1022 } 1023 1024 if (error == 0) 1025 ip6stat.ip6s_fragmented++; 1026 1027 done: 1028 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1029 RTFREE(ro->ro_rt); 1030 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1031 RTFREE(ro_pmtu->ro_rt); 1032 } 1033 1034 #ifdef IPSEC 1035 if (sp != NULL) 1036 key_freesp(sp); 1037 #endif /* IPSEC */ 1038 1039 return(error); 1040 1041 freehdrs: 1042 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1043 m_freem(exthdrs.ip6e_dest1); 1044 m_freem(exthdrs.ip6e_rthdr); 1045 m_freem(exthdrs.ip6e_dest2); 1046 /* fall through */ 1047 bad: 1048 m_freem(m); 1049 goto done; 1050 } 1051 1052 static int 1053 ip6_copyexthdr(mp, hdr, hlen) 1054 struct mbuf **mp; 1055 caddr_t hdr; 1056 int hlen; 1057 { 1058 struct mbuf *m; 1059 1060 if (hlen > MCLBYTES) 1061 return(ENOBUFS); /* XXX */ 1062 1063 MGET(m, M_DONTWAIT, MT_DATA); 1064 if (!m) 1065 return(ENOBUFS); 1066 1067 if (hlen > MLEN) { 1068 MCLGET(m, M_DONTWAIT); 1069 if ((m->m_flags & M_EXT) == 0) { 1070 m_free(m); 1071 return(ENOBUFS); 1072 } 1073 } 1074 m->m_len = hlen; 1075 if (hdr) 1076 bcopy(hdr, mtod(m, caddr_t), hlen); 1077 1078 *mp = m; 1079 return(0); 1080 } 1081 1082 /* 1083 * Insert jumbo payload option. 1084 */ 1085 static int 1086 ip6_insert_jumboopt(exthdrs, plen) 1087 struct ip6_exthdrs *exthdrs; 1088 u_int32_t plen; 1089 { 1090 struct mbuf *mopt; 1091 u_char *optbuf; 1092 u_int32_t v; 1093 1094 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1095 1096 /* 1097 * If there is no hop-by-hop options header, allocate new one. 1098 * If there is one but it doesn't have enough space to store the 1099 * jumbo payload option, allocate a cluster to store the whole options. 1100 * Otherwise, use it to store the options. 1101 */ 1102 if (exthdrs->ip6e_hbh == 0) { 1103 MGET(mopt, M_DONTWAIT, MT_DATA); 1104 if (mopt == 0) 1105 return(ENOBUFS); 1106 mopt->m_len = JUMBOOPTLEN; 1107 optbuf = mtod(mopt, u_char *); 1108 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1109 exthdrs->ip6e_hbh = mopt; 1110 } else { 1111 struct ip6_hbh *hbh; 1112 1113 mopt = exthdrs->ip6e_hbh; 1114 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1115 /* 1116 * XXX assumption: 1117 * - exthdrs->ip6e_hbh is not referenced from places 1118 * other than exthdrs. 1119 * - exthdrs->ip6e_hbh is not an mbuf chain. 1120 */ 1121 int oldoptlen = mopt->m_len; 1122 struct mbuf *n; 1123 1124 /* 1125 * XXX: give up if the whole (new) hbh header does 1126 * not fit even in an mbuf cluster. 1127 */ 1128 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1129 return(ENOBUFS); 1130 1131 /* 1132 * As a consequence, we must always prepare a cluster 1133 * at this point. 1134 */ 1135 MGET(n, M_DONTWAIT, MT_DATA); 1136 if (n) { 1137 MCLGET(n, M_DONTWAIT); 1138 if ((n->m_flags & M_EXT) == 0) { 1139 m_freem(n); 1140 n = NULL; 1141 } 1142 } 1143 if (!n) 1144 return(ENOBUFS); 1145 n->m_len = oldoptlen + JUMBOOPTLEN; 1146 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1147 oldoptlen); 1148 optbuf = mtod(n, caddr_t) + oldoptlen; 1149 m_freem(mopt); 1150 mopt = exthdrs->ip6e_hbh = n; 1151 } else { 1152 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1153 mopt->m_len += JUMBOOPTLEN; 1154 } 1155 optbuf[0] = IP6OPT_PADN; 1156 optbuf[1] = 0; 1157 1158 /* 1159 * Adjust the header length according to the pad and 1160 * the jumbo payload option. 1161 */ 1162 hbh = mtod(mopt, struct ip6_hbh *); 1163 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1164 } 1165 1166 /* fill in the option. */ 1167 optbuf[2] = IP6OPT_JUMBO; 1168 optbuf[3] = 4; 1169 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1170 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1171 1172 /* finally, adjust the packet header length */ 1173 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1174 1175 return(0); 1176 #undef JUMBOOPTLEN 1177 } 1178 1179 /* 1180 * Insert fragment header and copy unfragmentable header portions. 1181 */ 1182 static int 1183 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1184 struct mbuf *m0, *m; 1185 int hlen; 1186 struct ip6_frag **frghdrp; 1187 { 1188 struct mbuf *n, *mlast; 1189 1190 if (hlen > sizeof(struct ip6_hdr)) { 1191 n = m_copym(m0, sizeof(struct ip6_hdr), 1192 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1193 if (n == 0) 1194 return(ENOBUFS); 1195 m->m_next = n; 1196 } else 1197 n = m; 1198 1199 /* Search for the last mbuf of unfragmentable part. */ 1200 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1201 ; 1202 1203 if ((mlast->m_flags & M_EXT) == 0 && 1204 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1205 /* use the trailing space of the last mbuf for the fragment hdr */ 1206 *frghdrp = 1207 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1208 mlast->m_len += sizeof(struct ip6_frag); 1209 m->m_pkthdr.len += sizeof(struct ip6_frag); 1210 } else { 1211 /* allocate a new mbuf for the fragment header */ 1212 struct mbuf *mfrg; 1213 1214 MGET(mfrg, M_DONTWAIT, MT_DATA); 1215 if (mfrg == 0) 1216 return(ENOBUFS); 1217 mfrg->m_len = sizeof(struct ip6_frag); 1218 *frghdrp = mtod(mfrg, struct ip6_frag *); 1219 mlast->m_next = mfrg; 1220 } 1221 1222 return(0); 1223 } 1224 1225 /* 1226 * IP6 socket option processing. 1227 */ 1228 int 1229 ip6_ctloutput(op, so, level, optname, mp) 1230 int op; 1231 struct socket *so; 1232 int level, optname; 1233 struct mbuf **mp; 1234 { 1235 struct in6pcb *in6p = sotoin6pcb(so); 1236 struct mbuf *m = *mp; 1237 int optval = 0; 1238 int error = 0; 1239 struct proc *p = curproc; /* XXX */ 1240 1241 if (level == IPPROTO_IPV6) { 1242 switch (op) { 1243 1244 case PRCO_SETOPT: 1245 switch (optname) { 1246 case IPV6_PKTOPTIONS: 1247 /* m is freed in ip6_pcbopts */ 1248 return(ip6_pcbopts(&in6p->in6p_outputopts, 1249 m, so)); 1250 case IPV6_HOPOPTS: 1251 case IPV6_DSTOPTS: 1252 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1253 error = EPERM; 1254 break; 1255 } 1256 /* fall through */ 1257 case IPV6_UNICAST_HOPS: 1258 case IPV6_RECVOPTS: 1259 case IPV6_RECVRETOPTS: 1260 case IPV6_RECVDSTADDR: 1261 case IPV6_PKTINFO: 1262 case IPV6_HOPLIMIT: 1263 case IPV6_RTHDR: 1264 case IPV6_FAITH: 1265 case IPV6_V6ONLY: 1266 if (!m || m->m_len != sizeof(int)) { 1267 error = EINVAL; 1268 break; 1269 } 1270 optval = *mtod(m, int *); 1271 switch (optname) { 1272 1273 case IPV6_UNICAST_HOPS: 1274 if (optval < -1 || optval >= 256) 1275 error = EINVAL; 1276 else { 1277 /* -1 = kernel default */ 1278 in6p->in6p_hops = optval; 1279 } 1280 break; 1281 #define OPTSET(bit) \ 1282 if (optval) \ 1283 in6p->in6p_flags |= bit; \ 1284 else \ 1285 in6p->in6p_flags &= ~bit; 1286 1287 case IPV6_RECVOPTS: 1288 OPTSET(IN6P_RECVOPTS); 1289 break; 1290 1291 case IPV6_RECVRETOPTS: 1292 OPTSET(IN6P_RECVRETOPTS); 1293 break; 1294 1295 case IPV6_RECVDSTADDR: 1296 OPTSET(IN6P_RECVDSTADDR); 1297 break; 1298 1299 case IPV6_PKTINFO: 1300 OPTSET(IN6P_PKTINFO); 1301 break; 1302 1303 case IPV6_HOPLIMIT: 1304 OPTSET(IN6P_HOPLIMIT); 1305 break; 1306 1307 case IPV6_HOPOPTS: 1308 OPTSET(IN6P_HOPOPTS); 1309 break; 1310 1311 case IPV6_DSTOPTS: 1312 OPTSET(IN6P_DSTOPTS); 1313 break; 1314 1315 case IPV6_RTHDR: 1316 OPTSET(IN6P_RTHDR); 1317 break; 1318 1319 case IPV6_FAITH: 1320 OPTSET(IN6P_FAITH); 1321 break; 1322 1323 case IPV6_V6ONLY: 1324 /* 1325 * make setsockopt(IPV6_V6ONLY) 1326 * available only prior to bind(2). 1327 * see ipng mailing list, Jun 22 2001. 1328 */ 1329 if (in6p->in6p_lport || 1330 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1331 { 1332 error = EINVAL; 1333 break; 1334 } 1335 #ifdef INET6_BINDV6ONLY 1336 if (!optval) 1337 error = EINVAL; 1338 #else 1339 OPTSET(IN6P_IPV6_V6ONLY); 1340 #endif 1341 break; 1342 } 1343 break; 1344 #undef OPTSET 1345 1346 case IPV6_MULTICAST_IF: 1347 case IPV6_MULTICAST_HOPS: 1348 case IPV6_MULTICAST_LOOP: 1349 case IPV6_JOIN_GROUP: 1350 case IPV6_LEAVE_GROUP: 1351 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1352 break; 1353 1354 case IPV6_PORTRANGE: 1355 optval = *mtod(m, int *); 1356 1357 switch (optval) { 1358 case IPV6_PORTRANGE_DEFAULT: 1359 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1360 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1361 break; 1362 1363 case IPV6_PORTRANGE_HIGH: 1364 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1365 in6p->in6p_flags |= IN6P_HIGHPORT; 1366 break; 1367 1368 case IPV6_PORTRANGE_LOW: 1369 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1370 in6p->in6p_flags |= IN6P_LOWPORT; 1371 break; 1372 1373 default: 1374 error = EINVAL; 1375 break; 1376 } 1377 break; 1378 1379 #ifdef IPSEC 1380 case IPV6_IPSEC_POLICY: 1381 { 1382 caddr_t req = NULL; 1383 size_t len = 0; 1384 1385 int priv = 0; 1386 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1387 priv = 0; 1388 else 1389 priv = 1; 1390 if (m) { 1391 req = mtod(m, caddr_t); 1392 len = m->m_len; 1393 } 1394 error = ipsec6_set_policy(in6p, 1395 optname, req, len, priv); 1396 } 1397 break; 1398 #endif /* IPSEC */ 1399 1400 default: 1401 error = ENOPROTOOPT; 1402 break; 1403 } 1404 if (m) 1405 (void)m_free(m); 1406 break; 1407 1408 case PRCO_GETOPT: 1409 switch (optname) { 1410 1411 case IPV6_OPTIONS: 1412 case IPV6_RETOPTS: 1413 #if 0 1414 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1415 if (in6p->in6p_options) { 1416 m->m_len = in6p->in6p_options->m_len; 1417 bcopy(mtod(in6p->in6p_options, caddr_t), 1418 mtod(m, caddr_t), 1419 (unsigned)m->m_len); 1420 } else 1421 m->m_len = 0; 1422 break; 1423 #else 1424 error = ENOPROTOOPT; 1425 break; 1426 #endif 1427 1428 case IPV6_PKTOPTIONS: 1429 if (in6p->in6p_options) { 1430 *mp = m_copym(in6p->in6p_options, 0, 1431 M_COPYALL, M_WAIT); 1432 } else { 1433 *mp = m_get(M_WAIT, MT_SOOPTS); 1434 (*mp)->m_len = 0; 1435 } 1436 break; 1437 1438 case IPV6_HOPOPTS: 1439 case IPV6_DSTOPTS: 1440 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1441 error = EPERM; 1442 break; 1443 } 1444 /* fall through */ 1445 case IPV6_UNICAST_HOPS: 1446 case IPV6_RECVOPTS: 1447 case IPV6_RECVRETOPTS: 1448 case IPV6_RECVDSTADDR: 1449 case IPV6_PORTRANGE: 1450 case IPV6_PKTINFO: 1451 case IPV6_HOPLIMIT: 1452 case IPV6_RTHDR: 1453 case IPV6_FAITH: 1454 case IPV6_V6ONLY: 1455 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1456 m->m_len = sizeof(int); 1457 switch (optname) { 1458 1459 case IPV6_UNICAST_HOPS: 1460 optval = in6p->in6p_hops; 1461 break; 1462 1463 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1464 1465 case IPV6_RECVOPTS: 1466 optval = OPTBIT(IN6P_RECVOPTS); 1467 break; 1468 1469 case IPV6_RECVRETOPTS: 1470 optval = OPTBIT(IN6P_RECVRETOPTS); 1471 break; 1472 1473 case IPV6_RECVDSTADDR: 1474 optval = OPTBIT(IN6P_RECVDSTADDR); 1475 break; 1476 1477 case IPV6_PORTRANGE: 1478 { 1479 int flags; 1480 flags = in6p->in6p_flags; 1481 if (flags & IN6P_HIGHPORT) 1482 optval = IPV6_PORTRANGE_HIGH; 1483 else if (flags & IN6P_LOWPORT) 1484 optval = IPV6_PORTRANGE_LOW; 1485 else 1486 optval = 0; 1487 break; 1488 } 1489 1490 case IPV6_PKTINFO: 1491 optval = OPTBIT(IN6P_PKTINFO); 1492 break; 1493 1494 case IPV6_HOPLIMIT: 1495 optval = OPTBIT(IN6P_HOPLIMIT); 1496 break; 1497 1498 case IPV6_HOPOPTS: 1499 optval = OPTBIT(IN6P_HOPOPTS); 1500 break; 1501 1502 case IPV6_DSTOPTS: 1503 optval = OPTBIT(IN6P_DSTOPTS); 1504 break; 1505 1506 case IPV6_RTHDR: 1507 optval = OPTBIT(IN6P_RTHDR); 1508 break; 1509 1510 case IPV6_FAITH: 1511 optval = OPTBIT(IN6P_FAITH); 1512 break; 1513 1514 case IPV6_V6ONLY: 1515 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1516 break; 1517 } 1518 *mtod(m, int *) = optval; 1519 break; 1520 1521 case IPV6_MULTICAST_IF: 1522 case IPV6_MULTICAST_HOPS: 1523 case IPV6_MULTICAST_LOOP: 1524 case IPV6_JOIN_GROUP: 1525 case IPV6_LEAVE_GROUP: 1526 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1527 break; 1528 1529 #ifdef IPSEC 1530 case IPV6_IPSEC_POLICY: 1531 { 1532 caddr_t req = NULL; 1533 size_t len = 0; 1534 1535 if (m) { 1536 req = mtod(m, caddr_t); 1537 len = m->m_len; 1538 } 1539 error = ipsec6_get_policy(in6p, req, len, mp); 1540 break; 1541 } 1542 #endif /* IPSEC */ 1543 1544 default: 1545 error = ENOPROTOOPT; 1546 break; 1547 } 1548 break; 1549 } 1550 } else { 1551 error = EINVAL; 1552 if (op == PRCO_SETOPT && *mp) 1553 (void)m_free(*mp); 1554 } 1555 return(error); 1556 } 1557 1558 /* 1559 * Set up IP6 options in pcb for insertion in output packets. 1560 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1561 * with destination address if source routed. 1562 */ 1563 static int 1564 ip6_pcbopts(pktopt, m, so) 1565 struct ip6_pktopts **pktopt; 1566 struct mbuf *m; 1567 struct socket *so; 1568 { 1569 struct ip6_pktopts *opt = *pktopt; 1570 int error = 0; 1571 struct proc *p = curproc; /* XXX */ 1572 int priv = 0; 1573 1574 /* turn off any old options. */ 1575 if (opt) { 1576 if (opt->ip6po_m) 1577 (void)m_free(opt->ip6po_m); 1578 } else 1579 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1580 *pktopt = 0; 1581 1582 if (!m || m->m_len == 0) { 1583 /* 1584 * Only turning off any previous options. 1585 */ 1586 if (opt) 1587 free(opt, M_IP6OPT); 1588 if (m) 1589 (void)m_free(m); 1590 return(0); 1591 } 1592 1593 /* set options specified by user. */ 1594 if (p && !suser(p->p_ucred, &p->p_acflag)) 1595 priv = 1; 1596 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1597 (void)m_free(m); 1598 return(error); 1599 } 1600 *pktopt = opt; 1601 return(0); 1602 } 1603 1604 /* 1605 * Set the IP6 multicast options in response to user setsockopt(). 1606 */ 1607 static int 1608 ip6_setmoptions(optname, im6op, m) 1609 int optname; 1610 struct ip6_moptions **im6op; 1611 struct mbuf *m; 1612 { 1613 int error = 0; 1614 u_int loop, ifindex; 1615 struct ipv6_mreq *mreq; 1616 struct ifnet *ifp; 1617 struct ip6_moptions *im6o = *im6op; 1618 struct route_in6 ro; 1619 struct sockaddr_in6 *dst; 1620 struct in6_multi_mship *imm; 1621 struct proc *p = curproc; /* XXX */ 1622 1623 if (im6o == NULL) { 1624 /* 1625 * No multicast option buffer attached to the pcb; 1626 * allocate one and initialize to default values. 1627 */ 1628 im6o = (struct ip6_moptions *) 1629 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1630 1631 if (im6o == NULL) 1632 return(ENOBUFS); 1633 *im6op = im6o; 1634 im6o->im6o_multicast_ifp = NULL; 1635 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1636 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1637 LIST_INIT(&im6o->im6o_memberships); 1638 } 1639 1640 switch (optname) { 1641 1642 case IPV6_MULTICAST_IF: 1643 /* 1644 * Select the interface for outgoing multicast packets. 1645 */ 1646 if (m == NULL || m->m_len != sizeof(u_int)) { 1647 error = EINVAL; 1648 break; 1649 } 1650 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1651 if (ifindex < 0 || if_index < ifindex) { 1652 error = ENXIO; /* XXX EINVAL? */ 1653 break; 1654 } 1655 ifp = ifindex2ifnet[ifindex]; 1656 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1657 error = EADDRNOTAVAIL; 1658 break; 1659 } 1660 im6o->im6o_multicast_ifp = ifp; 1661 break; 1662 1663 case IPV6_MULTICAST_HOPS: 1664 { 1665 /* 1666 * Set the IP6 hoplimit for outgoing multicast packets. 1667 */ 1668 int optval; 1669 if (m == NULL || m->m_len != sizeof(int)) { 1670 error = EINVAL; 1671 break; 1672 } 1673 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1674 if (optval < -1 || optval >= 256) 1675 error = EINVAL; 1676 else if (optval == -1) 1677 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1678 else 1679 im6o->im6o_multicast_hlim = optval; 1680 break; 1681 } 1682 1683 case IPV6_MULTICAST_LOOP: 1684 /* 1685 * Set the loopback flag for outgoing multicast packets. 1686 * Must be zero or one. 1687 */ 1688 if (m == NULL || m->m_len != sizeof(u_int)) { 1689 error = EINVAL; 1690 break; 1691 } 1692 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1693 if (loop > 1) { 1694 error = EINVAL; 1695 break; 1696 } 1697 im6o->im6o_multicast_loop = loop; 1698 break; 1699 1700 case IPV6_JOIN_GROUP: 1701 /* 1702 * Add a multicast group membership. 1703 * Group must be a valid IP6 multicast address. 1704 */ 1705 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1706 error = EINVAL; 1707 break; 1708 } 1709 mreq = mtod(m, struct ipv6_mreq *); 1710 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1711 /* 1712 * We use the unspecified address to specify to accept 1713 * all multicast addresses. Only super user is allowed 1714 * to do this. 1715 */ 1716 if (suser(p->p_ucred, &p->p_acflag)) 1717 { 1718 error = EACCES; 1719 break; 1720 } 1721 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1722 error = EINVAL; 1723 break; 1724 } 1725 1726 /* 1727 * If the interface is specified, validate it. 1728 */ 1729 if (mreq->ipv6mr_interface < 0 1730 || if_index < mreq->ipv6mr_interface) { 1731 error = ENXIO; /* XXX EINVAL? */ 1732 break; 1733 } 1734 /* 1735 * If no interface was explicitly specified, choose an 1736 * appropriate one according to the given multicast address. 1737 */ 1738 if (mreq->ipv6mr_interface == 0) { 1739 /* 1740 * If the multicast address is in node-local scope, 1741 * the interface should be a loopback interface. 1742 * Otherwise, look up the routing table for the 1743 * address, and choose the outgoing interface. 1744 * XXX: is it a good approach? 1745 */ 1746 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1747 ifp = &loif[0]; 1748 } else { 1749 ro.ro_rt = NULL; 1750 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1751 bzero(dst, sizeof(*dst)); 1752 dst->sin6_len = sizeof(struct sockaddr_in6); 1753 dst->sin6_family = AF_INET6; 1754 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1755 rtalloc((struct route *)&ro); 1756 if (ro.ro_rt == NULL) { 1757 error = EADDRNOTAVAIL; 1758 break; 1759 } 1760 ifp = ro.ro_rt->rt_ifp; 1761 rtfree(ro.ro_rt); 1762 } 1763 } else 1764 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1765 1766 /* 1767 * See if we found an interface, and confirm that it 1768 * supports multicast 1769 */ 1770 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1771 error = EADDRNOTAVAIL; 1772 break; 1773 } 1774 /* 1775 * Put interface index into the multicast address, 1776 * if the address has link-local scope. 1777 */ 1778 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1779 mreq->ipv6mr_multiaddr.s6_addr16[1] 1780 = htons(mreq->ipv6mr_interface); 1781 } 1782 /* 1783 * See if the membership already exists. 1784 */ 1785 for (imm = im6o->im6o_memberships.lh_first; 1786 imm != NULL; imm = imm->i6mm_chain.le_next) 1787 if (imm->i6mm_maddr->in6m_ifp == ifp && 1788 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1789 &mreq->ipv6mr_multiaddr)) 1790 break; 1791 if (imm != NULL) { 1792 error = EADDRINUSE; 1793 break; 1794 } 1795 /* 1796 * Everything looks good; add a new record to the multicast 1797 * address list for the given interface. 1798 */ 1799 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1800 if (!imm) 1801 break; 1802 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1803 break; 1804 1805 case IPV6_LEAVE_GROUP: 1806 /* 1807 * Drop a multicast group membership. 1808 * Group must be a valid IP6 multicast address. 1809 */ 1810 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1811 error = EINVAL; 1812 break; 1813 } 1814 mreq = mtod(m, struct ipv6_mreq *); 1815 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1816 if (suser(p->p_ucred, &p->p_acflag)) 1817 { 1818 error = EACCES; 1819 break; 1820 } 1821 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1822 error = EINVAL; 1823 break; 1824 } 1825 /* 1826 * If an interface address was specified, get a pointer 1827 * to its ifnet structure. 1828 */ 1829 if (mreq->ipv6mr_interface < 0 1830 || if_index < mreq->ipv6mr_interface) { 1831 error = ENXIO; /* XXX EINVAL? */ 1832 break; 1833 } 1834 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1835 /* 1836 * Put interface index into the multicast address, 1837 * if the address has link-local scope. 1838 */ 1839 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1840 mreq->ipv6mr_multiaddr.s6_addr16[1] 1841 = htons(mreq->ipv6mr_interface); 1842 } 1843 /* 1844 * Find the membership in the membership list. 1845 */ 1846 for (imm = im6o->im6o_memberships.lh_first; 1847 imm != NULL; imm = imm->i6mm_chain.le_next) { 1848 if ((ifp == NULL || 1849 imm->i6mm_maddr->in6m_ifp == ifp) && 1850 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1851 &mreq->ipv6mr_multiaddr)) 1852 break; 1853 } 1854 if (imm == NULL) { 1855 /* Unable to resolve interface */ 1856 error = EADDRNOTAVAIL; 1857 break; 1858 } 1859 /* 1860 * Give up the multicast address record to which the 1861 * membership points. 1862 */ 1863 LIST_REMOVE(imm, i6mm_chain); 1864 in6_leavegroup(imm); 1865 break; 1866 1867 default: 1868 error = EOPNOTSUPP; 1869 break; 1870 } 1871 1872 /* 1873 * If all options have default values, no need to keep the mbuf. 1874 */ 1875 if (im6o->im6o_multicast_ifp == NULL && 1876 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1877 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1878 im6o->im6o_memberships.lh_first == NULL) { 1879 free(*im6op, M_IPMOPTS); 1880 *im6op = NULL; 1881 } 1882 1883 return(error); 1884 } 1885 1886 /* 1887 * Return the IP6 multicast options in response to user getsockopt(). 1888 */ 1889 static int 1890 ip6_getmoptions(optname, im6o, mp) 1891 int optname; 1892 struct ip6_moptions *im6o; 1893 struct mbuf **mp; 1894 { 1895 u_int *hlim, *loop, *ifindex; 1896 1897 *mp = m_get(M_WAIT, MT_SOOPTS); 1898 1899 switch (optname) { 1900 1901 case IPV6_MULTICAST_IF: 1902 ifindex = mtod(*mp, u_int *); 1903 (*mp)->m_len = sizeof(u_int); 1904 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1905 *ifindex = 0; 1906 else 1907 *ifindex = im6o->im6o_multicast_ifp->if_index; 1908 return(0); 1909 1910 case IPV6_MULTICAST_HOPS: 1911 hlim = mtod(*mp, u_int *); 1912 (*mp)->m_len = sizeof(u_int); 1913 if (im6o == NULL) 1914 *hlim = ip6_defmcasthlim; 1915 else 1916 *hlim = im6o->im6o_multicast_hlim; 1917 return(0); 1918 1919 case IPV6_MULTICAST_LOOP: 1920 loop = mtod(*mp, u_int *); 1921 (*mp)->m_len = sizeof(u_int); 1922 if (im6o == NULL) 1923 *loop = ip6_defmcasthlim; 1924 else 1925 *loop = im6o->im6o_multicast_loop; 1926 return(0); 1927 1928 default: 1929 return(EOPNOTSUPP); 1930 } 1931 } 1932 1933 /* 1934 * Discard the IP6 multicast options. 1935 */ 1936 void 1937 ip6_freemoptions(im6o) 1938 struct ip6_moptions *im6o; 1939 { 1940 struct in6_multi_mship *imm; 1941 1942 if (im6o == NULL) 1943 return; 1944 1945 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1946 LIST_REMOVE(imm, i6mm_chain); 1947 in6_leavegroup(imm); 1948 } 1949 free(im6o, M_IPMOPTS); 1950 } 1951 1952 /* 1953 * Set IPv6 outgoing packet options based on advanced API. 1954 */ 1955 int 1956 ip6_setpktoptions(control, opt, priv) 1957 struct mbuf *control; 1958 struct ip6_pktopts *opt; 1959 int priv; 1960 { 1961 struct cmsghdr *cm = 0; 1962 1963 if (control == 0 || opt == 0) 1964 return(EINVAL); 1965 1966 bzero(opt, sizeof(*opt)); 1967 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1968 1969 /* 1970 * XXX: Currently, we assume all the optional information is stored 1971 * in a single mbuf. 1972 */ 1973 if (control->m_next) 1974 return(EINVAL); 1975 1976 opt->ip6po_m = control; 1977 1978 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1979 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1980 cm = mtod(control, struct cmsghdr *); 1981 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1982 return(EINVAL); 1983 if (cm->cmsg_level != IPPROTO_IPV6) 1984 continue; 1985 1986 switch (cm->cmsg_type) { 1987 case IPV6_PKTINFO: 1988 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1989 return(EINVAL); 1990 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1991 if (opt->ip6po_pktinfo->ipi6_ifindex && 1992 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1993 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1994 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1995 1996 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1997 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1998 return(ENXIO); 1999 } 2000 2001 /* 2002 * Check if the requested source address is indeed a 2003 * unicast address assigned to the node, and can be 2004 * used as the packet's source address. 2005 */ 2006 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2007 struct ifaddr *ia; 2008 struct in6_ifaddr *ia6; 2009 struct sockaddr_in6 sin6; 2010 2011 bzero(&sin6, sizeof(sin6)); 2012 sin6.sin6_len = sizeof(sin6); 2013 sin6.sin6_family = AF_INET6; 2014 sin6.sin6_addr = 2015 opt->ip6po_pktinfo->ipi6_addr; 2016 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2017 if (ia == NULL || 2018 (opt->ip6po_pktinfo->ipi6_ifindex && 2019 (ia->ifa_ifp->if_index != 2020 opt->ip6po_pktinfo->ipi6_ifindex))) { 2021 return(EADDRNOTAVAIL); 2022 } 2023 ia6 = (struct in6_ifaddr *)ia; 2024 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2025 return(EADDRNOTAVAIL); 2026 } 2027 2028 /* 2029 * Check if the requested source address is 2030 * indeed a unicast address assigned to the 2031 * node. 2032 */ 2033 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2034 return(EADDRNOTAVAIL); 2035 } 2036 break; 2037 2038 case IPV6_HOPLIMIT: 2039 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2040 return(EINVAL); 2041 2042 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2043 sizeof(opt->ip6po_hlim)); 2044 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2045 return(EINVAL); 2046 break; 2047 2048 case IPV6_NEXTHOP: 2049 if (!priv) 2050 return(EPERM); 2051 2052 if (cm->cmsg_len < sizeof(u_char) || 2053 /* check if cmsg_len is large enough for sa_len */ 2054 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2055 return(EINVAL); 2056 2057 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2058 2059 break; 2060 2061 case IPV6_HOPOPTS: 2062 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2063 return(EINVAL); 2064 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2065 if (cm->cmsg_len != 2066 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2067 return(EINVAL); 2068 break; 2069 2070 case IPV6_DSTOPTS: 2071 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2072 return(EINVAL); 2073 2074 /* 2075 * If there is no routing header yet, the destination 2076 * options header should be put on the 1st part. 2077 * Otherwise, the header should be on the 2nd part. 2078 * (See RFC 2460, section 4.1) 2079 */ 2080 if (opt->ip6po_rthdr == NULL) { 2081 opt->ip6po_dest1 = 2082 (struct ip6_dest *)CMSG_DATA(cm); 2083 if (cm->cmsg_len != 2084 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2085 << 3)) 2086 return(EINVAL); 2087 } 2088 else { 2089 opt->ip6po_dest2 = 2090 (struct ip6_dest *)CMSG_DATA(cm); 2091 if (cm->cmsg_len != 2092 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2093 << 3)) 2094 return(EINVAL); 2095 } 2096 break; 2097 2098 case IPV6_RTHDR: 2099 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2100 return(EINVAL); 2101 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2102 if (cm->cmsg_len != 2103 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2104 return(EINVAL); 2105 switch (opt->ip6po_rthdr->ip6r_type) { 2106 case IPV6_RTHDR_TYPE_0: 2107 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2108 return(EINVAL); 2109 break; 2110 default: 2111 return(EINVAL); 2112 } 2113 break; 2114 2115 default: 2116 return(ENOPROTOOPT); 2117 } 2118 } 2119 2120 return(0); 2121 } 2122 2123 /* 2124 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2125 * packet to the input queue of a specified interface. Note that this 2126 * calls the output routine of the loopback "driver", but with an interface 2127 * pointer that might NOT be &loif -- easier than replicating that code here. 2128 */ 2129 void 2130 ip6_mloopback(ifp, m, dst) 2131 struct ifnet *ifp; 2132 struct mbuf *m; 2133 struct sockaddr_in6 *dst; 2134 { 2135 struct mbuf *copym; 2136 struct ip6_hdr *ip6; 2137 2138 copym = m_copy(m, 0, M_COPYALL); 2139 if (copym == NULL) 2140 return; 2141 2142 /* 2143 * Make sure to deep-copy IPv6 header portion in case the data 2144 * is in an mbuf cluster, so that we can safely override the IPv6 2145 * header portion later. 2146 */ 2147 if ((copym->m_flags & M_EXT) != 0 || 2148 copym->m_len < sizeof(struct ip6_hdr)) { 2149 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2150 if (copym == NULL) 2151 return; 2152 } 2153 2154 #ifdef DIAGNOSTIC 2155 if (copym->m_len < sizeof(*ip6)) { 2156 m_freem(copym); 2157 return; 2158 } 2159 #endif 2160 2161 ip6 = mtod(copym, struct ip6_hdr *); 2162 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2163 ip6->ip6_src.s6_addr16[1] = 0; 2164 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2165 ip6->ip6_dst.s6_addr16[1] = 0; 2166 2167 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2168 } 2169 2170 /* 2171 * Chop IPv6 header off from the payload. 2172 */ 2173 static int 2174 ip6_splithdr(m, exthdrs) 2175 struct mbuf *m; 2176 struct ip6_exthdrs *exthdrs; 2177 { 2178 struct mbuf *mh; 2179 struct ip6_hdr *ip6; 2180 2181 ip6 = mtod(m, struct ip6_hdr *); 2182 if (m->m_len > sizeof(*ip6)) { 2183 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2184 if (mh == 0) { 2185 m_freem(m); 2186 return ENOBUFS; 2187 } 2188 M_COPY_PKTHDR(mh, m); 2189 MH_ALIGN(mh, sizeof(*ip6)); 2190 m->m_flags &= ~M_PKTHDR; 2191 m->m_len -= sizeof(*ip6); 2192 m->m_data += sizeof(*ip6); 2193 mh->m_next = m; 2194 m = mh; 2195 m->m_len = sizeof(*ip6); 2196 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2197 } 2198 exthdrs->ip6e_ip6 = m; 2199 return 0; 2200 } 2201 2202 /* 2203 * Compute IPv6 extension header length. 2204 */ 2205 int 2206 ip6_optlen(in6p) 2207 struct in6pcb *in6p; 2208 { 2209 int len; 2210 2211 if (!in6p->in6p_outputopts) 2212 return 0; 2213 2214 len = 0; 2215 #define elen(x) \ 2216 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2217 2218 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2219 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2220 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2221 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2222 return len; 2223 #undef elen 2224 } 2225
Indexes created Tue Sep 30 20:09:53 GMT 2025