ip6_output.c revision 1.23.2.6
1 /* $NetBSD: ip6_output.c,v 1.23.2.6 2002/02/26 20:14:37 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 #include <netinet6/ip6protosw.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #include <netkey/key.h> 100 #include <netkey/key_debug.h> 101 #endif /* IPSEC */ 102 103 #include "loop.h" 104 105 #include <net/net_osdep.h> 106 107 #ifdef IPV6FIREWALL 108 #include <netinet6/ip6_fw.h> 109 #endif 110 111 struct ip6_exthdrs { 112 struct mbuf *ip6e_ip6; 113 struct mbuf *ip6e_hbh; 114 struct mbuf *ip6e_dest1; 115 struct mbuf *ip6e_rthdr; 116 struct mbuf *ip6e_dest2; 117 }; 118 119 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 120 struct socket *)); 121 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 122 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 123 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 124 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 125 struct ip6_frag **)); 126 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 127 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 128 129 extern struct ifnet loif[NLOOP]; 130 131 /* 132 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 133 * header (with pri, len, nxt, hlim, src, dst). 134 * This function may modify ver and hlim only. 135 * The mbuf chain containing the packet will be freed. 136 * The mbuf opt, if present, will not be freed. 137 */ 138 int 139 ip6_output(m0, opt, ro, flags, im6o, ifpp) 140 struct mbuf *m0; 141 struct ip6_pktopts *opt; 142 struct route_in6 *ro; 143 int flags; 144 struct ip6_moptions *im6o; 145 struct ifnet **ifpp; /* XXX: just for statistics */ 146 { 147 struct ip6_hdr *ip6, *mhip6; 148 struct ifnet *ifp, *origifp; 149 struct mbuf *m = m0; 150 int hlen, tlen, len, off; 151 struct route_in6 ip6route; 152 struct sockaddr_in6 *dst; 153 int error = 0; 154 struct in6_ifaddr *ia; 155 u_long mtu; 156 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 157 struct ip6_exthdrs exthdrs; 158 struct in6_addr finaldst; 159 struct route_in6 *ro_pmtu = NULL; 160 int hdrsplit = 0; 161 int needipsec = 0; 162 #ifdef PFIL_HOOKS 163 struct packet_filter_hook *pfh; 164 struct mbuf *m1; 165 int rv; 166 #endif /* PFIL_HOOKS */ 167 #ifdef IPSEC 168 int needipsectun = 0; 169 struct socket *so; 170 struct secpolicy *sp = NULL; 171 172 /* for AH processing. stupid to have "socket" variable in IP layer... */ 173 so = ipsec_getsocket(m); 174 (void)ipsec_setsocket(m, NULL); 175 ip6 = mtod(m, struct ip6_hdr *); 176 #endif /* IPSEC */ 177 178 #define MAKE_EXTHDR(hp, mp) \ 179 do { \ 180 if (hp) { \ 181 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 182 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 183 ((eh)->ip6e_len + 1) << 3); \ 184 if (error) \ 185 goto freehdrs; \ 186 } \ 187 } while (0) 188 189 bzero(&exthdrs, sizeof(exthdrs)); 190 if (opt) { 191 /* Hop-by-Hop options header */ 192 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 193 /* Destination options header(1st part) */ 194 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 195 /* Routing header */ 196 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 197 /* Destination options header(2nd part) */ 198 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 199 } 200 201 #ifdef IPSEC 202 /* get a security policy for this packet */ 203 if (so == NULL) 204 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 205 else 206 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 207 208 if (sp == NULL) { 209 ipsec6stat.out_inval++; 210 goto freehdrs; 211 } 212 213 error = 0; 214 215 /* check policy */ 216 switch (sp->policy) { 217 case IPSEC_POLICY_DISCARD: 218 /* 219 * This packet is just discarded. 220 */ 221 ipsec6stat.out_polvio++; 222 goto freehdrs; 223 224 case IPSEC_POLICY_BYPASS: 225 case IPSEC_POLICY_NONE: 226 /* no need to do IPsec. */ 227 needipsec = 0; 228 break; 229 230 case IPSEC_POLICY_IPSEC: 231 if (sp->req == NULL) { 232 /* XXX should be panic ? */ 233 printf("ip6_output: No IPsec request specified.\n"); 234 error = EINVAL; 235 goto freehdrs; 236 } 237 needipsec = 1; 238 break; 239 240 case IPSEC_POLICY_ENTRUST: 241 default: 242 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 243 } 244 #endif /* IPSEC */ 245 246 /* 247 * Calculate the total length of the extension header chain. 248 * Keep the length of the unfragmentable part for fragmentation. 249 */ 250 optlen = 0; 251 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 252 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 253 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 254 unfragpartlen = optlen + sizeof(struct ip6_hdr); 255 /* NOTE: we don't add AH/ESP length here. do that later. */ 256 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 257 258 /* 259 * If we need IPsec, or there is at least one extension header, 260 * separate IP6 header from the payload. 261 */ 262 if ((needipsec || optlen) && !hdrsplit) { 263 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 264 m = NULL; 265 goto freehdrs; 266 } 267 m = exthdrs.ip6e_ip6; 268 hdrsplit++; 269 } 270 271 /* adjust pointer */ 272 ip6 = mtod(m, struct ip6_hdr *); 273 274 /* adjust mbuf packet header length */ 275 m->m_pkthdr.len += optlen; 276 plen = m->m_pkthdr.len - sizeof(*ip6); 277 278 /* If this is a jumbo payload, insert a jumbo payload option. */ 279 if (plen > IPV6_MAXPACKET) { 280 if (!hdrsplit) { 281 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 282 m = NULL; 283 goto freehdrs; 284 } 285 m = exthdrs.ip6e_ip6; 286 hdrsplit++; 287 } 288 /* adjust pointer */ 289 ip6 = mtod(m, struct ip6_hdr *); 290 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 291 goto freehdrs; 292 ip6->ip6_plen = 0; 293 } else 294 ip6->ip6_plen = htons(plen); 295 296 /* 297 * Concatenate headers and fill in next header fields. 298 * Here we have, on "m" 299 * IPv6 payload 300 * and we insert headers accordingly. Finally, we should be getting: 301 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 302 * 303 * during the header composing process, "m" points to IPv6 header. 304 * "mprev" points to an extension header prior to esp. 305 */ 306 { 307 u_char *nexthdrp = &ip6->ip6_nxt; 308 struct mbuf *mprev = m; 309 310 /* 311 * we treat dest2 specially. this makes IPsec processing 312 * much easier. 313 * 314 * result: IPv6 dest2 payload 315 * m and mprev will point to IPv6 header. 316 */ 317 if (exthdrs.ip6e_dest2) { 318 if (!hdrsplit) 319 panic("assumption failed: hdr not split"); 320 exthdrs.ip6e_dest2->m_next = m->m_next; 321 m->m_next = exthdrs.ip6e_dest2; 322 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 323 ip6->ip6_nxt = IPPROTO_DSTOPTS; 324 } 325 326 #define MAKE_CHAIN(m, mp, p, i)\ 327 do {\ 328 if (m) {\ 329 if (!hdrsplit) \ 330 panic("assumption failed: hdr not split"); \ 331 *mtod((m), u_char *) = *(p);\ 332 *(p) = (i);\ 333 p = mtod((m), u_char *);\ 334 (m)->m_next = (mp)->m_next;\ 335 (mp)->m_next = (m);\ 336 (mp) = (m);\ 337 }\ 338 } while (0) 339 /* 340 * result: IPv6 hbh dest1 rthdr dest2 payload 341 * m will point to IPv6 header. mprev will point to the 342 * extension header prior to dest2 (rthdr in the above case). 343 */ 344 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 345 nexthdrp, IPPROTO_HOPOPTS); 346 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 347 nexthdrp, IPPROTO_DSTOPTS); 348 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 349 nexthdrp, IPPROTO_ROUTING); 350 351 #ifdef IPSEC 352 if (!needipsec) 353 goto skip_ipsec2; 354 355 /* 356 * pointers after IPsec headers are not valid any more. 357 * other pointers need a great care too. 358 * (IPsec routines should not mangle mbufs prior to AH/ESP) 359 */ 360 exthdrs.ip6e_dest2 = NULL; 361 362 { 363 struct ip6_rthdr *rh = NULL; 364 int segleft_org = 0; 365 struct ipsec_output_state state; 366 367 if (exthdrs.ip6e_rthdr) { 368 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 369 segleft_org = rh->ip6r_segleft; 370 rh->ip6r_segleft = 0; 371 } 372 373 bzero(&state, sizeof(state)); 374 state.m = m; 375 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 376 &needipsectun); 377 m = state.m; 378 if (error) { 379 /* mbuf is already reclaimed in ipsec6_output_trans. */ 380 m = NULL; 381 switch (error) { 382 case EHOSTUNREACH: 383 case ENETUNREACH: 384 case EMSGSIZE: 385 case ENOBUFS: 386 case ENOMEM: 387 break; 388 default: 389 printf("ip6_output (ipsec): error code %d\n", error); 390 /*fall through*/ 391 case ENOENT: 392 /* don't show these error codes to the user */ 393 error = 0; 394 break; 395 } 396 goto bad; 397 } 398 if (exthdrs.ip6e_rthdr) { 399 /* ah6_output doesn't modify mbuf chain */ 400 rh->ip6r_segleft = segleft_org; 401 } 402 } 403 skip_ipsec2:; 404 #endif 405 } 406 407 /* 408 * If there is a routing header, replace destination address field 409 * with the first hop of the routing header. 410 */ 411 if (exthdrs.ip6e_rthdr) { 412 struct ip6_rthdr *rh = 413 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 414 struct ip6_rthdr *)); 415 struct ip6_rthdr0 *rh0; 416 417 finaldst = ip6->ip6_dst; 418 switch(rh->ip6r_type) { 419 case IPV6_RTHDR_TYPE_0: 420 rh0 = (struct ip6_rthdr0 *)rh; 421 ip6->ip6_dst = rh0->ip6r0_addr[0]; 422 bcopy((caddr_t)&rh0->ip6r0_addr[1], 423 (caddr_t)&rh0->ip6r0_addr[0], 424 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 425 ); 426 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 427 break; 428 default: /* is it possible? */ 429 error = EINVAL; 430 goto bad; 431 } 432 } 433 434 /* Source address validation */ 435 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 436 (flags & IPV6_DADOUTPUT) == 0) { 437 error = EOPNOTSUPP; 438 ip6stat.ip6s_badscope++; 439 goto bad; 440 } 441 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 442 error = EOPNOTSUPP; 443 ip6stat.ip6s_badscope++; 444 goto bad; 445 } 446 447 ip6stat.ip6s_localout++; 448 449 /* 450 * Route packet. 451 */ 452 if (ro == 0) { 453 ro = &ip6route; 454 bzero((caddr_t)ro, sizeof(*ro)); 455 } 456 ro_pmtu = ro; 457 if (opt && opt->ip6po_rthdr) 458 ro = &opt->ip6po_route; 459 dst = (struct sockaddr_in6 *)&ro->ro_dst; 460 /* 461 * If there is a cached route, 462 * check that it is to the same destination 463 * and is still up. If not, free it and try again. 464 */ 465 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 466 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 467 RTFREE(ro->ro_rt); 468 ro->ro_rt = (struct rtentry *)0; 469 } 470 if (ro->ro_rt == 0) { 471 bzero(dst, sizeof(*dst)); 472 dst->sin6_family = AF_INET6; 473 dst->sin6_len = sizeof(struct sockaddr_in6); 474 dst->sin6_addr = ip6->ip6_dst; 475 } 476 #ifdef IPSEC 477 if (needipsec && needipsectun) { 478 struct ipsec_output_state state; 479 480 /* 481 * All the extension headers will become inaccessible 482 * (since they can be encrypted). 483 * Don't panic, we need no more updates to extension headers 484 * on inner IPv6 packet (since they are now encapsulated). 485 * 486 * IPv6 [ESP|AH] IPv6 [extension headers] payload 487 */ 488 bzero(&exthdrs, sizeof(exthdrs)); 489 exthdrs.ip6e_ip6 = m; 490 491 bzero(&state, sizeof(state)); 492 state.m = m; 493 state.ro = (struct route *)ro; 494 state.dst = (struct sockaddr *)dst; 495 496 error = ipsec6_output_tunnel(&state, sp, flags); 497 498 m = state.m; 499 ro = (struct route_in6 *)state.ro; 500 dst = (struct sockaddr_in6 *)state.dst; 501 if (error) { 502 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 503 m0 = m = NULL; 504 m = NULL; 505 switch (error) { 506 case EHOSTUNREACH: 507 case ENETUNREACH: 508 case EMSGSIZE: 509 case ENOBUFS: 510 case ENOMEM: 511 break; 512 default: 513 printf("ip6_output (ipsec): error code %d\n", error); 514 /*fall through*/ 515 case ENOENT: 516 /* don't show these error codes to the user */ 517 error = 0; 518 break; 519 } 520 goto bad; 521 } 522 523 exthdrs.ip6e_ip6 = m; 524 } 525 #endif /*IPSEC*/ 526 527 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 528 /* Unicast */ 529 530 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 531 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 532 /* xxx 533 * interface selection comes here 534 * if an interface is specified from an upper layer, 535 * ifp must point it. 536 */ 537 if (ro->ro_rt == 0) { 538 /* 539 * non-bsdi always clone routes, if parent is 540 * PRF_CLONING. 541 */ 542 rtalloc((struct route *)ro); 543 } 544 if (ro->ro_rt == 0) { 545 ip6stat.ip6s_noroute++; 546 error = EHOSTUNREACH; 547 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 548 goto bad; 549 } 550 ia = ifatoia6(ro->ro_rt->rt_ifa); 551 ifp = ro->ro_rt->rt_ifp; 552 ro->ro_rt->rt_use++; 553 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 554 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 555 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 556 557 in6_ifstat_inc(ifp, ifs6_out_request); 558 559 /* 560 * Check if the outgoing interface conflicts with 561 * the interface specified by ifi6_ifindex (if specified). 562 * Note that loopback interface is always okay. 563 * (this may happen when we are sending a packet to one of 564 * our own addresses.) 565 */ 566 if (opt && opt->ip6po_pktinfo 567 && opt->ip6po_pktinfo->ipi6_ifindex) { 568 if (!(ifp->if_flags & IFF_LOOPBACK) 569 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 570 ip6stat.ip6s_noroute++; 571 in6_ifstat_inc(ifp, ifs6_out_discard); 572 error = EHOSTUNREACH; 573 goto bad; 574 } 575 } 576 577 if (opt && opt->ip6po_hlim != -1) 578 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 579 } else { 580 /* Multicast */ 581 struct in6_multi *in6m; 582 583 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 584 585 /* 586 * See if the caller provided any multicast options 587 */ 588 ifp = NULL; 589 if (im6o != NULL) { 590 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 591 if (im6o->im6o_multicast_ifp != NULL) 592 ifp = im6o->im6o_multicast_ifp; 593 } else 594 ip6->ip6_hlim = ip6_defmcasthlim; 595 596 /* 597 * See if the caller provided the outgoing interface 598 * as an ancillary data. 599 * Boundary check for ifindex is assumed to be already done. 600 */ 601 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 602 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 603 604 /* 605 * If the destination is a node-local scope multicast, 606 * the packet should be loop-backed only. 607 */ 608 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 609 /* 610 * If the outgoing interface is already specified, 611 * it should be a loopback interface. 612 */ 613 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 614 ip6stat.ip6s_badscope++; 615 error = ENETUNREACH; /* XXX: better error? */ 616 /* XXX correct ifp? */ 617 in6_ifstat_inc(ifp, ifs6_out_discard); 618 goto bad; 619 } else { 620 ifp = &loif[0]; 621 } 622 } 623 624 if (opt && opt->ip6po_hlim != -1) 625 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 626 627 /* 628 * If caller did not provide an interface lookup a 629 * default in the routing table. This is either a 630 * default for the speicfied group (i.e. a host 631 * route), or a multicast default (a route for the 632 * ``net'' ff00::/8). 633 */ 634 if (ifp == NULL) { 635 if (ro->ro_rt == 0) { 636 ro->ro_rt = rtalloc1((struct sockaddr *) 637 &ro->ro_dst, 0 638 ); 639 } 640 if (ro->ro_rt == 0) { 641 ip6stat.ip6s_noroute++; 642 error = EHOSTUNREACH; 643 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 644 goto bad; 645 } 646 ia = ifatoia6(ro->ro_rt->rt_ifa); 647 ifp = ro->ro_rt->rt_ifp; 648 ro->ro_rt->rt_use++; 649 } 650 651 if ((flags & IPV6_FORWARDING) == 0) 652 in6_ifstat_inc(ifp, ifs6_out_request); 653 in6_ifstat_inc(ifp, ifs6_out_mcast); 654 655 /* 656 * Confirm that the outgoing interface supports multicast. 657 */ 658 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 659 ip6stat.ip6s_noroute++; 660 in6_ifstat_inc(ifp, ifs6_out_discard); 661 error = ENETUNREACH; 662 goto bad; 663 } 664 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 665 if (in6m != NULL && 666 (im6o == NULL || im6o->im6o_multicast_loop)) { 667 /* 668 * If we belong to the destination multicast group 669 * on the outgoing interface, and the caller did not 670 * forbid loopback, loop back a copy. 671 */ 672 ip6_mloopback(ifp, m, dst); 673 } else { 674 /* 675 * If we are acting as a multicast router, perform 676 * multicast forwarding as if the packet had just 677 * arrived on the interface to which we are about 678 * to send. The multicast forwarding function 679 * recursively calls this function, using the 680 * IPV6_FORWARDING flag to prevent infinite recursion. 681 * 682 * Multicasts that are looped back by ip6_mloopback(), 683 * above, will be forwarded by the ip6_input() routine, 684 * if necessary. 685 */ 686 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 687 if (ip6_mforward(ip6, ifp, m) != 0) { 688 m_freem(m); 689 goto done; 690 } 691 } 692 } 693 /* 694 * Multicasts with a hoplimit of zero may be looped back, 695 * above, but must not be transmitted on a network. 696 * Also, multicasts addressed to the loopback interface 697 * are not sent -- the above call to ip6_mloopback() will 698 * loop back a copy if this host actually belongs to the 699 * destination group on the loopback interface. 700 */ 701 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 702 m_freem(m); 703 goto done; 704 } 705 } 706 707 /* 708 * Fill the outgoing inteface to tell the upper layer 709 * to increment per-interface statistics. 710 */ 711 if (ifpp) 712 *ifpp = ifp; 713 714 /* 715 * Determine path MTU. 716 */ 717 if (ro_pmtu != ro) { 718 /* The first hop and the final destination may differ. */ 719 struct sockaddr_in6 *sin6_fin = 720 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 721 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 722 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 723 &finaldst))) { 724 RTFREE(ro_pmtu->ro_rt); 725 ro_pmtu->ro_rt = (struct rtentry *)0; 726 } 727 if (ro_pmtu->ro_rt == 0) { 728 bzero(sin6_fin, sizeof(*sin6_fin)); 729 sin6_fin->sin6_family = AF_INET6; 730 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 731 sin6_fin->sin6_addr = finaldst; 732 733 rtalloc((struct route *)ro_pmtu); 734 } 735 } 736 if (ro_pmtu->ro_rt != NULL) { 737 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 738 739 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 740 if (mtu > ifmtu) { 741 /* 742 * The MTU on the route is larger than the MTU on 743 * the interface! This shouldn't happen, unless the 744 * MTU of the interface has been changed after the 745 * interface was brought up. Change the MTU in the 746 * route to match the interface MTU (as long as the 747 * field isn't locked). 748 */ 749 mtu = ifmtu; 750 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 751 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 752 } 753 } else { 754 mtu = nd_ifinfo[ifp->if_index].linkmtu; 755 } 756 757 /* Fake scoped addresses */ 758 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 759 /* 760 * If source or destination address is a scoped address, and 761 * the packet is going to be sent to a loopback interface, 762 * we should keep the original interface. 763 */ 764 765 /* 766 * XXX: this is a very experimental and temporary solution. 767 * We eventually have sockaddr_in6 and use the sin6_scope_id 768 * field of the structure here. 769 * We rely on the consistency between two scope zone ids 770 * of source add destination, which should already be assured 771 * Larger scopes than link will be supported in the near 772 * future. 773 */ 774 origifp = NULL; 775 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 776 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 777 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 778 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 779 /* 780 * XXX: origifp can be NULL even in those two cases above. 781 * For example, if we remove the (only) link-local address 782 * from the loopback interface, and try to send a link-local 783 * address without link-id information. Then the source 784 * address is ::1, and the destination address is the 785 * link-local address with its s6_addr16[1] being zero. 786 * What is worse, if the packet goes to the loopback interface 787 * by a default rejected route, the null pointer would be 788 * passed to looutput, and the kernel would hang. 789 * The following last resort would prevent such disaster. 790 */ 791 if (origifp == NULL) 792 origifp = ifp; 793 } 794 else 795 origifp = ifp; 796 #ifndef FAKE_LOOPBACK_IF 797 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 798 #else 799 if (1) 800 #endif 801 { 802 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 803 ip6->ip6_src.s6_addr16[1] = 0; 804 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 805 ip6->ip6_dst.s6_addr16[1] = 0; 806 } 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, 815 struct ip6_hbh *); 816 u_int32_t dummy1; /* XXX unused */ 817 u_int32_t dummy2; /* XXX unused */ 818 819 /* 820 * XXX: if we have to send an ICMPv6 error to the sender, 821 * we need the M_LOOP flag since icmp6_error() expects 822 * the IPv6 and the hop-by-hop options header are 823 * continuous unless the flag is set. 824 */ 825 m->m_flags |= M_LOOP; 826 m->m_pkthdr.rcvif = ifp; 827 if (ip6_process_hopopts(m, 828 (u_int8_t *)(hbh + 1), 829 ((hbh->ip6h_len + 1) << 3) - 830 sizeof(struct ip6_hbh), 831 &dummy1, &dummy2) < 0) { 832 /* m was already freed at this point */ 833 error = EINVAL;/* better error? */ 834 goto done; 835 } 836 m->m_flags &= ~M_LOOP; /* XXX */ 837 m->m_pkthdr.rcvif = NULL; 838 } 839 840 #ifdef PFIL_HOOKS 841 /* 842 * Run through list of hooks for output packets. 843 */ 844 m1 = m; 845 pfh = pfil_hook_get(PFIL_OUT, 846 &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 847 for (; pfh; pfh = pfh->pfil_link.tqe_next) 848 if (pfh->pfil_func) { 849 rv = pfh->pfil_func(ip6, sizeof(*ip6), ifp, 1, &m1); 850 if (rv) { 851 error = EHOSTUNREACH; 852 goto done; 853 } 854 m = m1; 855 if (m == NULL) 856 goto done; 857 ip6 = mtod(m, struct ip6_hdr *); 858 } 859 #endif /* PFIL_HOOKS */ 860 /* 861 * Send the packet to the outgoing interface. 862 * If necessary, do IPv6 fragmentation before sending. 863 */ 864 tlen = m->m_pkthdr.len; 865 if (tlen <= mtu 866 #ifdef notyet 867 /* 868 * On any link that cannot convey a 1280-octet packet in one piece, 869 * link-specific fragmentation and reassembly must be provided at 870 * a layer below IPv6. [RFC 2460, sec.5] 871 * Thus if the interface has ability of link-level fragmentation, 872 * we can just send the packet even if the packet size is 873 * larger than the link's MTU. 874 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 875 */ 876 877 || ifp->if_flags & IFF_FRAGMENTABLE 878 #endif 879 ) 880 { 881 #ifdef IFA_STATS 882 if (IFA_STATS) { 883 struct in6_ifaddr *ia6; 884 ip6 = mtod(m, struct ip6_hdr *); 885 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 886 if (ia6) { 887 ia->ia_ifa.ifa_data.ifad_outbytes += 888 m->m_pkthdr.len; 889 } 890 } 891 #endif 892 #ifdef IPSEC 893 /* clean ipsec history once it goes out of the node */ 894 ipsec_delaux(m); 895 #endif 896 #ifdef OLDIP6OUTPUT 897 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 898 ro->ro_rt); 899 #else 900 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 901 #endif 902 goto done; 903 } else if (mtu < IPV6_MMTU) { 904 /* 905 * note that path MTU is never less than IPV6_MMTU 906 * (see icmp6_input). 907 */ 908 error = EMSGSIZE; 909 in6_ifstat_inc(ifp, ifs6_out_fragfail); 910 goto bad; 911 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 912 error = EMSGSIZE; 913 in6_ifstat_inc(ifp, ifs6_out_fragfail); 914 goto bad; 915 } else { 916 struct mbuf **mnext, *m_frgpart; 917 struct ip6_frag *ip6f; 918 u_int32_t id = htonl(ip6_id++); 919 u_char nextproto; 920 921 /* 922 * Too large for the destination or interface; 923 * fragment if possible. 924 * Must be able to put at least 8 bytes per fragment. 925 */ 926 hlen = unfragpartlen; 927 if (mtu > IPV6_MAXPACKET) 928 mtu = IPV6_MAXPACKET; 929 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 930 if (len < 8) { 931 error = EMSGSIZE; 932 in6_ifstat_inc(ifp, ifs6_out_fragfail); 933 goto bad; 934 } 935 936 mnext = &m->m_nextpkt; 937 938 /* 939 * Change the next header field of the last header in the 940 * unfragmentable part. 941 */ 942 if (exthdrs.ip6e_rthdr) { 943 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 944 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 945 } else if (exthdrs.ip6e_dest1) { 946 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 947 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 948 } else if (exthdrs.ip6e_hbh) { 949 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 950 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 951 } else { 952 nextproto = ip6->ip6_nxt; 953 ip6->ip6_nxt = IPPROTO_FRAGMENT; 954 } 955 956 /* 957 * Loop through length of segment after first fragment, 958 * make new header and copy data of each part and link onto chain. 959 */ 960 m0 = m; 961 for (off = hlen; off < tlen; off += len) { 962 MGETHDR(m, M_DONTWAIT, MT_HEADER); 963 if (!m) { 964 error = ENOBUFS; 965 ip6stat.ip6s_odropped++; 966 goto sendorfree; 967 } 968 m->m_flags = m0->m_flags & M_COPYFLAGS; 969 *mnext = m; 970 mnext = &m->m_nextpkt; 971 m->m_data += max_linkhdr; 972 mhip6 = mtod(m, struct ip6_hdr *); 973 *mhip6 = *ip6; 974 m->m_len = sizeof(*mhip6); 975 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 976 if (error) { 977 ip6stat.ip6s_odropped++; 978 goto sendorfree; 979 } 980 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 981 if (off + len >= tlen) 982 len = tlen - off; 983 else 984 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 985 mhip6->ip6_plen = htons((u_short)(len + hlen + 986 sizeof(*ip6f) - 987 sizeof(struct ip6_hdr))); 988 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 989 error = ENOBUFS; 990 ip6stat.ip6s_odropped++; 991 goto sendorfree; 992 } 993 m_cat(m, m_frgpart); 994 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 995 m->m_pkthdr.rcvif = (struct ifnet *)0; 996 ip6f->ip6f_reserved = 0; 997 ip6f->ip6f_ident = id; 998 ip6f->ip6f_nxt = nextproto; 999 ip6stat.ip6s_ofragments++; 1000 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1001 } 1002 1003 in6_ifstat_inc(ifp, ifs6_out_fragok); 1004 } 1005 1006 /* 1007 * Remove leading garbages. 1008 */ 1009 sendorfree: 1010 m = m0->m_nextpkt; 1011 m0->m_nextpkt = 0; 1012 m_freem(m0); 1013 for (m0 = m; m; m = m0) { 1014 m0 = m->m_nextpkt; 1015 m->m_nextpkt = 0; 1016 if (error == 0) { 1017 #ifdef IFA_STATS 1018 if (IFA_STATS) { 1019 struct in6_ifaddr *ia6; 1020 ip6 = mtod(m, struct ip6_hdr *); 1021 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1022 if (ia6) { 1023 ia->ia_ifa.ifa_data.ifad_outbytes += 1024 m->m_pkthdr.len; 1025 } 1026 } 1027 #endif 1028 #ifdef IPSEC 1029 /* clean ipsec history once it goes out of the node */ 1030 ipsec_delaux(m); 1031 #endif 1032 #ifdef OLDIP6OUTPUT 1033 error = (*ifp->if_output)(ifp, m, 1034 (struct sockaddr *)dst, 1035 ro->ro_rt); 1036 #else 1037 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1038 #endif 1039 } else 1040 m_freem(m); 1041 } 1042 1043 if (error == 0) 1044 ip6stat.ip6s_fragmented++; 1045 1046 done: 1047 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1048 RTFREE(ro->ro_rt); 1049 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1050 RTFREE(ro_pmtu->ro_rt); 1051 } 1052 1053 #ifdef IPSEC 1054 if (sp != NULL) 1055 key_freesp(sp); 1056 #endif /* IPSEC */ 1057 1058 return(error); 1059 1060 freehdrs: 1061 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1062 m_freem(exthdrs.ip6e_dest1); 1063 m_freem(exthdrs.ip6e_rthdr); 1064 m_freem(exthdrs.ip6e_dest2); 1065 /* fall through */ 1066 bad: 1067 m_freem(m); 1068 goto done; 1069 } 1070 1071 static int 1072 ip6_copyexthdr(mp, hdr, hlen) 1073 struct mbuf **mp; 1074 caddr_t hdr; 1075 int hlen; 1076 { 1077 struct mbuf *m; 1078 1079 if (hlen > MCLBYTES) 1080 return(ENOBUFS); /* XXX */ 1081 1082 MGET(m, M_DONTWAIT, MT_DATA); 1083 if (!m) 1084 return(ENOBUFS); 1085 1086 if (hlen > MLEN) { 1087 MCLGET(m, M_DONTWAIT); 1088 if ((m->m_flags & M_EXT) == 0) { 1089 m_free(m); 1090 return(ENOBUFS); 1091 } 1092 } 1093 m->m_len = hlen; 1094 if (hdr) 1095 bcopy(hdr, mtod(m, caddr_t), hlen); 1096 1097 *mp = m; 1098 return(0); 1099 } 1100 1101 /* 1102 * Insert jumbo payload option. 1103 */ 1104 static int 1105 ip6_insert_jumboopt(exthdrs, plen) 1106 struct ip6_exthdrs *exthdrs; 1107 u_int32_t plen; 1108 { 1109 struct mbuf *mopt; 1110 u_char *optbuf; 1111 1112 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1113 1114 /* 1115 * If there is no hop-by-hop options header, allocate new one. 1116 * If there is one but it doesn't have enough space to store the 1117 * jumbo payload option, allocate a cluster to store the whole options. 1118 * Otherwise, use it to store the options. 1119 */ 1120 if (exthdrs->ip6e_hbh == 0) { 1121 MGET(mopt, M_DONTWAIT, MT_DATA); 1122 if (mopt == 0) 1123 return(ENOBUFS); 1124 mopt->m_len = JUMBOOPTLEN; 1125 optbuf = mtod(mopt, u_char *); 1126 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1127 exthdrs->ip6e_hbh = mopt; 1128 } else { 1129 struct ip6_hbh *hbh; 1130 1131 mopt = exthdrs->ip6e_hbh; 1132 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1133 caddr_t oldoptp = mtod(mopt, caddr_t); 1134 int oldoptlen = mopt->m_len; 1135 1136 if (mopt->m_flags & M_EXT) 1137 return(ENOBUFS); /* XXX */ 1138 MCLGET(mopt, M_DONTWAIT); 1139 if ((mopt->m_flags & M_EXT) == 0) 1140 return(ENOBUFS); 1141 1142 bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); 1143 optbuf = mtod(mopt, caddr_t) + oldoptlen; 1144 mopt->m_len = oldoptlen + JUMBOOPTLEN; 1145 } else { 1146 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1147 mopt->m_len += JUMBOOPTLEN; 1148 } 1149 optbuf[0] = IP6OPT_PADN; 1150 optbuf[1] = 1; 1151 1152 /* 1153 * Adjust the header length according to the pad and 1154 * the jumbo payload option. 1155 */ 1156 hbh = mtod(mopt, struct ip6_hbh *); 1157 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1158 } 1159 1160 /* fill in the option. */ 1161 optbuf[2] = IP6OPT_JUMBO; 1162 optbuf[3] = 4; 1163 *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); 1164 1165 /* finally, adjust the packet header length */ 1166 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1167 1168 return(0); 1169 #undef JUMBOOPTLEN 1170 } 1171 1172 /* 1173 * Insert fragment header and copy unfragmentable header portions. 1174 */ 1175 static int 1176 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1177 struct mbuf *m0, *m; 1178 int hlen; 1179 struct ip6_frag **frghdrp; 1180 { 1181 struct mbuf *n, *mlast; 1182 1183 if (hlen > sizeof(struct ip6_hdr)) { 1184 n = m_copym(m0, sizeof(struct ip6_hdr), 1185 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1186 if (n == 0) 1187 return(ENOBUFS); 1188 m->m_next = n; 1189 } else 1190 n = m; 1191 1192 /* Search for the last mbuf of unfragmentable part. */ 1193 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1194 ; 1195 1196 if ((mlast->m_flags & M_EXT) == 0 && 1197 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1198 /* use the trailing space of the last mbuf for the fragment hdr */ 1199 *frghdrp = 1200 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1201 mlast->m_len += sizeof(struct ip6_frag); 1202 m->m_pkthdr.len += sizeof(struct ip6_frag); 1203 } else { 1204 /* allocate a new mbuf for the fragment header */ 1205 struct mbuf *mfrg; 1206 1207 MGET(mfrg, M_DONTWAIT, MT_DATA); 1208 if (mfrg == 0) 1209 return(ENOBUFS); 1210 mfrg->m_len = sizeof(struct ip6_frag); 1211 *frghdrp = mtod(mfrg, struct ip6_frag *); 1212 mlast->m_next = mfrg; 1213 } 1214 1215 return(0); 1216 } 1217 1218 /* 1219 * IP6 socket option processing. 1220 */ 1221 int 1222 ip6_ctloutput(op, so, level, optname, mp) 1223 int op; 1224 struct socket *so; 1225 int level, optname; 1226 struct mbuf **mp; 1227 { 1228 register struct in6pcb *in6p = sotoin6pcb(so); 1229 register struct mbuf *m = *mp; 1230 register int optval = 0; 1231 int error = 0; 1232 struct proc *p = curproc; /* XXX */ 1233 1234 if (level == IPPROTO_IPV6) { 1235 switch (op) { 1236 1237 case PRCO_SETOPT: 1238 switch (optname) { 1239 case IPV6_PKTOPTIONS: 1240 /* m is freed in ip6_pcbopts */ 1241 return(ip6_pcbopts(&in6p->in6p_outputopts, 1242 m, so)); 1243 case IPV6_HOPOPTS: 1244 case IPV6_DSTOPTS: 1245 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1246 error = EPERM; 1247 break; 1248 } 1249 /* fall through */ 1250 case IPV6_UNICAST_HOPS: 1251 case IPV6_RECVOPTS: 1252 case IPV6_RECVRETOPTS: 1253 case IPV6_RECVDSTADDR: 1254 case IPV6_PKTINFO: 1255 case IPV6_HOPLIMIT: 1256 case IPV6_RTHDR: 1257 case IPV6_CHECKSUM: 1258 case IPV6_FAITH: 1259 #ifndef INET6_BINDV6ONLY 1260 case IPV6_BINDV6ONLY: 1261 #endif 1262 if (!m || m->m_len != sizeof(int)) 1263 error = EINVAL; 1264 else { 1265 optval = *mtod(m, int *); 1266 switch (optname) { 1267 1268 case IPV6_UNICAST_HOPS: 1269 if (optval < -1 || optval >= 256) 1270 error = EINVAL; 1271 else { 1272 /* -1 = kernel default */ 1273 in6p->in6p_hops = optval; 1274 } 1275 break; 1276 #define OPTSET(bit) \ 1277 if (optval) \ 1278 in6p->in6p_flags |= bit; \ 1279 else \ 1280 in6p->in6p_flags &= ~bit; 1281 1282 case IPV6_RECVOPTS: 1283 OPTSET(IN6P_RECVOPTS); 1284 break; 1285 1286 case IPV6_RECVRETOPTS: 1287 OPTSET(IN6P_RECVRETOPTS); 1288 break; 1289 1290 case IPV6_RECVDSTADDR: 1291 OPTSET(IN6P_RECVDSTADDR); 1292 break; 1293 1294 case IPV6_PKTINFO: 1295 OPTSET(IN6P_PKTINFO); 1296 break; 1297 1298 case IPV6_HOPLIMIT: 1299 OPTSET(IN6P_HOPLIMIT); 1300 break; 1301 1302 case IPV6_HOPOPTS: 1303 OPTSET(IN6P_HOPOPTS); 1304 break; 1305 1306 case IPV6_DSTOPTS: 1307 OPTSET(IN6P_DSTOPTS); 1308 break; 1309 1310 case IPV6_RTHDR: 1311 OPTSET(IN6P_RTHDR); 1312 break; 1313 1314 case IPV6_CHECKSUM: 1315 in6p->in6p_cksum = optval; 1316 break; 1317 1318 case IPV6_FAITH: 1319 OPTSET(IN6P_FAITH); 1320 break; 1321 1322 #ifndef INET6_BINDV6ONLY 1323 case IPV6_BINDV6ONLY: 1324 OPTSET(IN6P_BINDV6ONLY); 1325 break; 1326 #endif 1327 } 1328 } 1329 break; 1330 #undef OPTSET 1331 1332 case IPV6_MULTICAST_IF: 1333 case IPV6_MULTICAST_HOPS: 1334 case IPV6_MULTICAST_LOOP: 1335 case IPV6_JOIN_GROUP: 1336 case IPV6_LEAVE_GROUP: 1337 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1338 break; 1339 1340 case IPV6_PORTRANGE: 1341 optval = *mtod(m, int *); 1342 1343 switch (optval) { 1344 case IPV6_PORTRANGE_DEFAULT: 1345 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1346 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1347 break; 1348 1349 case IPV6_PORTRANGE_HIGH: 1350 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1351 in6p->in6p_flags |= IN6P_HIGHPORT; 1352 break; 1353 1354 case IPV6_PORTRANGE_LOW: 1355 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1356 in6p->in6p_flags |= IN6P_LOWPORT; 1357 break; 1358 1359 default: 1360 error = EINVAL; 1361 break; 1362 } 1363 break; 1364 1365 #ifdef IPSEC 1366 case IPV6_IPSEC_POLICY: 1367 { 1368 caddr_t req = NULL; 1369 size_t len = 0; 1370 1371 int priv = 0; 1372 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1373 priv = 0; 1374 else 1375 priv = 1; 1376 if (m) { 1377 req = mtod(m, caddr_t); 1378 len = m->m_len; 1379 } 1380 error = ipsec6_set_policy(in6p, 1381 optname, req, len, priv); 1382 } 1383 break; 1384 #endif /* IPSEC */ 1385 1386 default: 1387 error = ENOPROTOOPT; 1388 break; 1389 } 1390 if (m) 1391 (void)m_free(m); 1392 break; 1393 1394 case PRCO_GETOPT: 1395 switch (optname) { 1396 1397 case IPV6_OPTIONS: 1398 case IPV6_RETOPTS: 1399 #if 0 1400 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1401 if (in6p->in6p_options) { 1402 m->m_len = in6p->in6p_options->m_len; 1403 bcopy(mtod(in6p->in6p_options, caddr_t), 1404 mtod(m, caddr_t), 1405 (unsigned)m->m_len); 1406 } else 1407 m->m_len = 0; 1408 break; 1409 #else 1410 error = ENOPROTOOPT; 1411 break; 1412 #endif 1413 1414 case IPV6_PKTOPTIONS: 1415 if (in6p->in6p_options) { 1416 *mp = m_copym(in6p->in6p_options, 0, 1417 M_COPYALL, M_WAIT); 1418 } else { 1419 *mp = m_get(M_WAIT, MT_SOOPTS); 1420 (*mp)->m_len = 0; 1421 } 1422 break; 1423 1424 case IPV6_HOPOPTS: 1425 case IPV6_DSTOPTS: 1426 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1427 error = EPERM; 1428 break; 1429 } 1430 /* fall through */ 1431 case IPV6_UNICAST_HOPS: 1432 case IPV6_RECVOPTS: 1433 case IPV6_RECVRETOPTS: 1434 case IPV6_RECVDSTADDR: 1435 case IPV6_PORTRANGE: 1436 case IPV6_PKTINFO: 1437 case IPV6_HOPLIMIT: 1438 case IPV6_RTHDR: 1439 case IPV6_CHECKSUM: 1440 case IPV6_FAITH: 1441 #ifndef INET6_BINDV6ONLY 1442 case IPV6_BINDV6ONLY: 1443 #endif 1444 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1445 m->m_len = sizeof(int); 1446 switch (optname) { 1447 1448 case IPV6_UNICAST_HOPS: 1449 optval = in6p->in6p_hops; 1450 break; 1451 1452 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1453 1454 case IPV6_RECVOPTS: 1455 optval = OPTBIT(IN6P_RECVOPTS); 1456 break; 1457 1458 case IPV6_RECVRETOPTS: 1459 optval = OPTBIT(IN6P_RECVRETOPTS); 1460 break; 1461 1462 case IPV6_RECVDSTADDR: 1463 optval = OPTBIT(IN6P_RECVDSTADDR); 1464 break; 1465 1466 case IPV6_PORTRANGE: 1467 { 1468 int flags; 1469 flags = in6p->in6p_flags; 1470 if (flags & IN6P_HIGHPORT) 1471 optval = IPV6_PORTRANGE_HIGH; 1472 else if (flags & IN6P_LOWPORT) 1473 optval = IPV6_PORTRANGE_LOW; 1474 else 1475 optval = 0; 1476 break; 1477 } 1478 1479 case IPV6_PKTINFO: 1480 optval = OPTBIT(IN6P_PKTINFO); 1481 break; 1482 1483 case IPV6_HOPLIMIT: 1484 optval = OPTBIT(IN6P_HOPLIMIT); 1485 break; 1486 1487 case IPV6_HOPOPTS: 1488 optval = OPTBIT(IN6P_HOPOPTS); 1489 break; 1490 1491 case IPV6_DSTOPTS: 1492 optval = OPTBIT(IN6P_DSTOPTS); 1493 break; 1494 1495 case IPV6_RTHDR: 1496 optval = OPTBIT(IN6P_RTHDR); 1497 break; 1498 1499 case IPV6_CHECKSUM: 1500 optval = in6p->in6p_cksum; 1501 break; 1502 1503 case IPV6_FAITH: 1504 optval = OPTBIT(IN6P_FAITH); 1505 break; 1506 1507 #ifndef INET6_BINDV6ONLY 1508 case IPV6_BINDV6ONLY: 1509 optval = OPTBIT(IN6P_BINDV6ONLY); 1510 break; 1511 #endif 1512 } 1513 *mtod(m, int *) = optval; 1514 break; 1515 1516 case IPV6_MULTICAST_IF: 1517 case IPV6_MULTICAST_HOPS: 1518 case IPV6_MULTICAST_LOOP: 1519 case IPV6_JOIN_GROUP: 1520 case IPV6_LEAVE_GROUP: 1521 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1522 break; 1523 1524 #ifdef IPSEC 1525 case IPV6_IPSEC_POLICY: 1526 { 1527 caddr_t req = NULL; 1528 size_t len = 0; 1529 1530 if (m) { 1531 req = mtod(m, caddr_t); 1532 len = m->m_len; 1533 } 1534 error = ipsec6_get_policy(in6p, req, len, mp); 1535 break; 1536 } 1537 #endif /* IPSEC */ 1538 1539 default: 1540 error = ENOPROTOOPT; 1541 break; 1542 } 1543 break; 1544 } 1545 } else { 1546 error = EINVAL; 1547 if (op == PRCO_SETOPT && *mp) 1548 (void)m_free(*mp); 1549 } 1550 return(error); 1551 } 1552 1553 /* 1554 * Set up IP6 options in pcb for insertion in output packets. 1555 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1556 * with destination address if source routed. 1557 */ 1558 static int 1559 ip6_pcbopts(pktopt, m, so) 1560 struct ip6_pktopts **pktopt; 1561 register struct mbuf *m; 1562 struct socket *so; 1563 { 1564 register struct ip6_pktopts *opt = *pktopt; 1565 int error = 0; 1566 struct proc *p = curproc; /* XXX */ 1567 int priv = 0; 1568 1569 /* turn off any old options. */ 1570 if (opt) { 1571 if (opt->ip6po_m) 1572 (void)m_free(opt->ip6po_m); 1573 } else 1574 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1575 *pktopt = 0; 1576 1577 if (!m || m->m_len == 0) { 1578 /* 1579 * Only turning off any previous options. 1580 */ 1581 if (opt) 1582 free(opt, M_IP6OPT); 1583 if (m) 1584 (void)m_free(m); 1585 return(0); 1586 } 1587 1588 /* set options specified by user. */ 1589 if (p && !suser(p->p_ucred, &p->p_acflag)) 1590 priv = 1; 1591 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1592 (void)m_free(m); 1593 return(error); 1594 } 1595 *pktopt = opt; 1596 return(0); 1597 } 1598 1599 /* 1600 * Set the IP6 multicast options in response to user setsockopt(). 1601 */ 1602 static int 1603 ip6_setmoptions(optname, im6op, m) 1604 int optname; 1605 struct ip6_moptions **im6op; 1606 struct mbuf *m; 1607 { 1608 int error = 0; 1609 u_int loop, ifindex; 1610 struct ipv6_mreq *mreq; 1611 struct ifnet *ifp; 1612 struct ip6_moptions *im6o = *im6op; 1613 struct route_in6 ro; 1614 struct sockaddr_in6 *dst; 1615 struct in6_multi_mship *imm; 1616 struct proc *p = curproc; /* XXX */ 1617 1618 if (im6o == NULL) { 1619 /* 1620 * No multicast option buffer attached to the pcb; 1621 * allocate one and initialize to default values. 1622 */ 1623 im6o = (struct ip6_moptions *) 1624 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1625 1626 if (im6o == NULL) 1627 return(ENOBUFS); 1628 *im6op = im6o; 1629 im6o->im6o_multicast_ifp = NULL; 1630 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1631 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1632 LIST_INIT(&im6o->im6o_memberships); 1633 } 1634 1635 switch (optname) { 1636 1637 case IPV6_MULTICAST_IF: 1638 /* 1639 * Select the interface for outgoing multicast packets. 1640 */ 1641 if (m == NULL || m->m_len != sizeof(u_int)) { 1642 error = EINVAL; 1643 break; 1644 } 1645 ifindex = *(mtod(m, u_int *)); 1646 if (ifindex < 0 || if_index < ifindex) { 1647 error = ENXIO; /* XXX EINVAL? */ 1648 break; 1649 } 1650 ifp = ifindex2ifnet[ifindex]; 1651 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1652 error = EADDRNOTAVAIL; 1653 break; 1654 } 1655 im6o->im6o_multicast_ifp = ifp; 1656 break; 1657 1658 case IPV6_MULTICAST_HOPS: 1659 { 1660 /* 1661 * Set the IP6 hoplimit for outgoing multicast packets. 1662 */ 1663 int optval; 1664 if (m == NULL || m->m_len != sizeof(int)) { 1665 error = EINVAL; 1666 break; 1667 } 1668 optval = *(mtod(m, u_int *)); 1669 if (optval < -1 || optval >= 256) 1670 error = EINVAL; 1671 else if (optval == -1) 1672 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1673 else 1674 im6o->im6o_multicast_hlim = optval; 1675 break; 1676 } 1677 1678 case IPV6_MULTICAST_LOOP: 1679 /* 1680 * Set the loopback flag for outgoing multicast packets. 1681 * Must be zero or one. 1682 */ 1683 if (m == NULL || m->m_len != sizeof(u_int) || 1684 (loop = *(mtod(m, u_int *))) > 1) { 1685 error = EINVAL; 1686 break; 1687 } 1688 im6o->im6o_multicast_loop = loop; 1689 break; 1690 1691 case IPV6_JOIN_GROUP: 1692 /* 1693 * Add a multicast group membership. 1694 * Group must be a valid IP6 multicast address. 1695 */ 1696 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1697 error = EINVAL; 1698 break; 1699 } 1700 mreq = mtod(m, struct ipv6_mreq *); 1701 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1702 /* 1703 * We use the unspecified address to specify to accept 1704 * all multicast addresses. Only super user is allowed 1705 * to do this. 1706 */ 1707 if (suser(p->p_ucred, &p->p_acflag)) { 1708 error = EACCES; 1709 break; 1710 } 1711 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1712 error = EINVAL; 1713 break; 1714 } 1715 1716 /* 1717 * If the interface is specified, validate it. 1718 */ 1719 if (mreq->ipv6mr_interface < 0 1720 || if_index < mreq->ipv6mr_interface) { 1721 error = ENXIO; /* XXX EINVAL? */ 1722 break; 1723 } 1724 /* 1725 * If no interface was explicitly specified, choose an 1726 * appropriate one according to the given multicast address. 1727 */ 1728 if (mreq->ipv6mr_interface == 0) { 1729 /* 1730 * If the multicast address is in node-local scope, 1731 * the interface should be a loopback interface. 1732 * Otherwise, look up the routing table for the 1733 * address, and choose the outgoing interface. 1734 * XXX: is it a good approach? 1735 */ 1736 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1737 ifp = &loif[0]; 1738 } else { 1739 ro.ro_rt = NULL; 1740 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1741 bzero(dst, sizeof(*dst)); 1742 dst->sin6_len = sizeof(struct sockaddr_in6); 1743 dst->sin6_family = AF_INET6; 1744 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1745 rtalloc((struct route *)&ro); 1746 if (ro.ro_rt == NULL) { 1747 error = EADDRNOTAVAIL; 1748 break; 1749 } 1750 ifp = ro.ro_rt->rt_ifp; 1751 rtfree(ro.ro_rt); 1752 } 1753 } else 1754 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1755 1756 /* 1757 * See if we found an interface, and confirm that it 1758 * supports multicast 1759 */ 1760 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1761 error = EADDRNOTAVAIL; 1762 break; 1763 } 1764 /* 1765 * Put interface index into the multicast address, 1766 * if the address has link-local scope. 1767 */ 1768 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1769 mreq->ipv6mr_multiaddr.s6_addr16[1] 1770 = htons(mreq->ipv6mr_interface); 1771 } 1772 /* 1773 * See if the membership already exists. 1774 */ 1775 for (imm = im6o->im6o_memberships.lh_first; 1776 imm != NULL; imm = imm->i6mm_chain.le_next) 1777 if (imm->i6mm_maddr->in6m_ifp == ifp && 1778 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1779 &mreq->ipv6mr_multiaddr)) 1780 break; 1781 if (imm != NULL) { 1782 error = EADDRINUSE; 1783 break; 1784 } 1785 /* 1786 * Everything looks good; add a new record to the multicast 1787 * address list for the given interface. 1788 */ 1789 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1790 if (imm == NULL) { 1791 error = ENOBUFS; 1792 break; 1793 } 1794 if ((imm->i6mm_maddr = 1795 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1796 free(imm, M_IPMADDR); 1797 break; 1798 } 1799 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1800 break; 1801 1802 case IPV6_LEAVE_GROUP: 1803 /* 1804 * Drop a multicast group membership. 1805 * Group must be a valid IP6 multicast address. 1806 */ 1807 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1808 error = EINVAL; 1809 break; 1810 } 1811 mreq = mtod(m, struct ipv6_mreq *); 1812 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1813 if (suser(p->p_ucred, &p->p_acflag)) { 1814 error = EACCES; 1815 break; 1816 } 1817 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1818 error = EINVAL; 1819 break; 1820 } 1821 /* 1822 * If an interface address was specified, get a pointer 1823 * to its ifnet structure. 1824 */ 1825 if (mreq->ipv6mr_interface < 0 1826 || if_index < mreq->ipv6mr_interface) { 1827 error = ENXIO; /* XXX EINVAL? */ 1828 break; 1829 } 1830 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1831 /* 1832 * Put interface index into the multicast address, 1833 * if the address has link-local scope. 1834 */ 1835 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1836 mreq->ipv6mr_multiaddr.s6_addr16[1] 1837 = htons(mreq->ipv6mr_interface); 1838 } 1839 /* 1840 * Find the membership in the membership list. 1841 */ 1842 for (imm = im6o->im6o_memberships.lh_first; 1843 imm != NULL; imm = imm->i6mm_chain.le_next) { 1844 if ((ifp == NULL || 1845 imm->i6mm_maddr->in6m_ifp == ifp) && 1846 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1847 &mreq->ipv6mr_multiaddr)) 1848 break; 1849 } 1850 if (imm == NULL) { 1851 /* Unable to resolve interface */ 1852 error = EADDRNOTAVAIL; 1853 break; 1854 } 1855 /* 1856 * Give up the multicast address record to which the 1857 * membership points. 1858 */ 1859 LIST_REMOVE(imm, i6mm_chain); 1860 in6_delmulti(imm->i6mm_maddr); 1861 free(imm, M_IPMADDR); 1862 break; 1863 1864 default: 1865 error = EOPNOTSUPP; 1866 break; 1867 } 1868 1869 /* 1870 * If all options have default values, no need to keep the mbuf. 1871 */ 1872 if (im6o->im6o_multicast_ifp == NULL && 1873 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1874 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1875 im6o->im6o_memberships.lh_first == NULL) { 1876 free(*im6op, M_IPMOPTS); 1877 *im6op = NULL; 1878 } 1879 1880 return(error); 1881 } 1882 1883 /* 1884 * Return the IP6 multicast options in response to user getsockopt(). 1885 */ 1886 static int 1887 ip6_getmoptions(optname, im6o, mp) 1888 int optname; 1889 register struct ip6_moptions *im6o; 1890 register struct mbuf **mp; 1891 { 1892 u_int *hlim, *loop, *ifindex; 1893 1894 *mp = m_get(M_WAIT, MT_SOOPTS); 1895 1896 switch (optname) { 1897 1898 case IPV6_MULTICAST_IF: 1899 ifindex = mtod(*mp, u_int *); 1900 (*mp)->m_len = sizeof(u_int); 1901 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1902 *ifindex = 0; 1903 else 1904 *ifindex = im6o->im6o_multicast_ifp->if_index; 1905 return(0); 1906 1907 case IPV6_MULTICAST_HOPS: 1908 hlim = mtod(*mp, u_int *); 1909 (*mp)->m_len = sizeof(u_int); 1910 if (im6o == NULL) 1911 *hlim = ip6_defmcasthlim; 1912 else 1913 *hlim = im6o->im6o_multicast_hlim; 1914 return(0); 1915 1916 case IPV6_MULTICAST_LOOP: 1917 loop = mtod(*mp, u_int *); 1918 (*mp)->m_len = sizeof(u_int); 1919 if (im6o == NULL) 1920 *loop = ip6_defmcasthlim; 1921 else 1922 *loop = im6o->im6o_multicast_loop; 1923 return(0); 1924 1925 default: 1926 return(EOPNOTSUPP); 1927 } 1928 } 1929 1930 /* 1931 * Discard the IP6 multicast options. 1932 */ 1933 void 1934 ip6_freemoptions(im6o) 1935 register struct ip6_moptions *im6o; 1936 { 1937 struct in6_multi_mship *imm; 1938 1939 if (im6o == NULL) 1940 return; 1941 1942 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1943 LIST_REMOVE(imm, i6mm_chain); 1944 if (imm->i6mm_maddr) 1945 in6_delmulti(imm->i6mm_maddr); 1946 free(imm, M_IPMADDR); 1947 } 1948 free(im6o, M_IPMOPTS); 1949 } 1950 1951 /* 1952 * Set IPv6 outgoing packet options based on advanced API. 1953 */ 1954 int 1955 ip6_setpktoptions(control, opt, priv) 1956 struct mbuf *control; 1957 struct ip6_pktopts *opt; 1958 int priv; 1959 { 1960 register struct cmsghdr *cm = 0; 1961 1962 if (control == 0 || opt == 0) 1963 return(EINVAL); 1964 1965 bzero(opt, sizeof(*opt)); 1966 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1967 1968 /* 1969 * XXX: Currently, we assume all the optional information is stored 1970 * in a single mbuf. 1971 */ 1972 if (control->m_next) 1973 return(EINVAL); 1974 1975 opt->ip6po_m = control; 1976 1977 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1978 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1979 cm = mtod(control, struct cmsghdr *); 1980 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1981 return(EINVAL); 1982 if (cm->cmsg_level != IPPROTO_IPV6) 1983 continue; 1984 1985 switch(cm->cmsg_type) { 1986 case IPV6_PKTINFO: 1987 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1988 return(EINVAL); 1989 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1990 if (opt->ip6po_pktinfo->ipi6_ifindex && 1991 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1992 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1993 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1994 1995 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1996 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1997 return(ENXIO); 1998 } 1999 2000 /* 2001 * Check if the requested source address is indeed a 2002 * unicast address assigned to the node, and can be 2003 * used as the packet's source address. 2004 */ 2005 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2006 struct ifaddr *ia; 2007 struct in6_ifaddr *ia6; 2008 struct sockaddr_in6 sin6; 2009 2010 bzero(&sin6, sizeof(sin6)); 2011 sin6.sin6_len = sizeof(sin6); 2012 sin6.sin6_family = AF_INET6; 2013 sin6.sin6_addr = 2014 opt->ip6po_pktinfo->ipi6_addr; 2015 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2016 if (ia == NULL || 2017 (opt->ip6po_pktinfo->ipi6_ifindex && 2018 (ia->ifa_ifp->if_index != 2019 opt->ip6po_pktinfo->ipi6_ifindex))) { 2020 return(EADDRNOTAVAIL); 2021 } 2022 ia6 = (struct in6_ifaddr *)ia; 2023 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2024 return(EADDRNOTAVAIL); 2025 } 2026 2027 /* 2028 * Check if the requested source address is 2029 * indeed a unicast address assigned to the 2030 * node. 2031 */ 2032 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2033 return(EADDRNOTAVAIL); 2034 } 2035 break; 2036 2037 case IPV6_HOPLIMIT: 2038 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2039 return(EINVAL); 2040 2041 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2042 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2043 return(EINVAL); 2044 break; 2045 2046 case IPV6_NEXTHOP: 2047 if (!priv) 2048 return(EPERM); 2049 2050 if (cm->cmsg_len < sizeof(u_char) || 2051 /* check if cmsg_len is large enough for sa_len */ 2052 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2053 return(EINVAL); 2054 2055 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2056 2057 break; 2058 2059 case IPV6_HOPOPTS: 2060 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2061 return(EINVAL); 2062 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2063 if (cm->cmsg_len != 2064 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2065 return(EINVAL); 2066 break; 2067 2068 case IPV6_DSTOPTS: 2069 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2070 return(EINVAL); 2071 2072 /* 2073 * If there is no routing header yet, the destination 2074 * options header should be put on the 1st part. 2075 * Otherwise, the header should be on the 2nd part. 2076 * (See RFC 2460, section 4.1) 2077 */ 2078 if (opt->ip6po_rthdr == NULL) { 2079 opt->ip6po_dest1 = 2080 (struct ip6_dest *)CMSG_DATA(cm); 2081 if (cm->cmsg_len != 2082 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2083 << 3)) 2084 return(EINVAL); 2085 } 2086 else { 2087 opt->ip6po_dest2 = 2088 (struct ip6_dest *)CMSG_DATA(cm); 2089 if (cm->cmsg_len != 2090 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2091 << 3)) 2092 return(EINVAL); 2093 } 2094 break; 2095 2096 case IPV6_RTHDR: 2097 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2098 return(EINVAL); 2099 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2100 if (cm->cmsg_len != 2101 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2102 return(EINVAL); 2103 switch(opt->ip6po_rthdr->ip6r_type) { 2104 case IPV6_RTHDR_TYPE_0: 2105 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2106 return(EINVAL); 2107 break; 2108 default: 2109 return(EINVAL); 2110 } 2111 break; 2112 2113 default: 2114 return(ENOPROTOOPT); 2115 } 2116 } 2117 2118 return(0); 2119 } 2120 2121 /* 2122 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2123 * packet to the input queue of a specified interface. Note that this 2124 * calls the output routine of the loopback "driver", but with an interface 2125 * pointer that might NOT be &loif -- easier than replicating that code here. 2126 */ 2127 void 2128 ip6_mloopback(ifp, m, dst) 2129 struct ifnet *ifp; 2130 register struct mbuf *m; 2131 register struct sockaddr_in6 *dst; 2132 { 2133 struct mbuf *copym; 2134 struct ip6_hdr *ip6; 2135 2136 copym = m_copy(m, 0, M_COPYALL); 2137 if (copym == NULL) 2138 return; 2139 2140 /* 2141 * Make sure to deep-copy IPv6 header portion in case the data 2142 * is in an mbuf cluster, so that we can safely override the IPv6 2143 * header portion later. 2144 */ 2145 if ((copym->m_flags & M_EXT) != 0 || 2146 copym->m_len < sizeof(struct ip6_hdr)) { 2147 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2148 if (copym == NULL) 2149 return; 2150 } 2151 2152 #ifdef DIAGNOSTIC 2153 if (copym->m_len < sizeof(*ip6)) { 2154 m_freem(copym); 2155 return; 2156 } 2157 #endif 2158 2159 #ifndef FAKE_LOOPBACK_IF 2160 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 2161 #else 2162 if (1) 2163 #endif 2164 { 2165 ip6 = mtod(copym, struct ip6_hdr *); 2166 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2167 ip6->ip6_src.s6_addr16[1] = 0; 2168 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2169 ip6->ip6_dst.s6_addr16[1] = 0; 2170 } 2171 2172 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2173 } 2174 2175 /* 2176 * Chop IPv6 header off from the payload. 2177 */ 2178 static int 2179 ip6_splithdr(m, exthdrs) 2180 struct mbuf *m; 2181 struct ip6_exthdrs *exthdrs; 2182 { 2183 struct mbuf *mh; 2184 struct ip6_hdr *ip6; 2185 2186 ip6 = mtod(m, struct ip6_hdr *); 2187 if (m->m_len > sizeof(*ip6)) { 2188 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2189 if (mh == 0) { 2190 m_freem(m); 2191 return ENOBUFS; 2192 } 2193 M_COPY_PKTHDR(mh, m); 2194 MH_ALIGN(mh, sizeof(*ip6)); 2195 m->m_flags &= ~M_PKTHDR; 2196 m->m_len -= sizeof(*ip6); 2197 m->m_data += sizeof(*ip6); 2198 mh->m_next = m; 2199 m = mh; 2200 m->m_len = sizeof(*ip6); 2201 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2202 } 2203 exthdrs->ip6e_ip6 = m; 2204 return 0; 2205 } 2206 2207 /* 2208 * Compute IPv6 extension header length. 2209 */ 2210 int 2211 ip6_optlen(in6p) 2212 struct in6pcb *in6p; 2213 { 2214 int len; 2215 2216 if (!in6p->in6p_outputopts) 2217 return 0; 2218 2219 len = 0; 2220 #define elen(x) \ 2221 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2222 2223 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2224 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2225 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2226 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2227 return len; 2228 #undef elen 2229 } 2230
Indexes created Tue Sep 30 20:09:53 GMT 2025