1 /* $FreeBSD$ */ 2 /* $KAME: ip6_output.c,v 1.115 2000/07/03 13:23:28 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 "opt_ip6fw.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/systm.h> 81 #include <sys/kernel.h> 82 #include <sys/proc.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/ip6.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet6/nd6.h> 94 95 #ifdef IPSEC 96 #include <netinet6/ipsec.h> 97 #ifdef INET6 98 #include <netinet6/ipsec6.h> 99 #endif 100 #include <netkey/key.h> 101 #endif /* IPSEC */ 102 103 #include <net/net_osdep.h> 104 105 #ifdef IPV6FIREWALL 106 #include <netinet6/ip6_fw.h> 107 #endif 108 109 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 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 *, struct sockopt *sopt)); 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 /* 130 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 131 * header (with pri, len, nxt, hlim, src, dst). 132 * This function may modify ver and hlim only. 133 * The mbuf chain containing the packet will be freed. 134 * The mbuf opt, if present, will not be freed. 135 */ 136 int 137 ip6_output(m0, opt, ro, flags, im6o, ifpp) 138 struct mbuf *m0; 139 struct ip6_pktopts *opt; 140 struct route_in6 *ro; 141 int flags; 142 struct ip6_moptions *im6o; 143 struct ifnet **ifpp; /* XXX: just for statistics */ 144 { 145 struct ip6_hdr *ip6, *mhip6; 146 struct ifnet *ifp, *origifp; 147 struct mbuf *m = m0; 148 int hlen, tlen, len, off; 149 struct route_in6 ip6route; 150 struct sockaddr_in6 *dst; 151 int error = 0; 152 struct in6_ifaddr *ia; 153 u_long mtu; 154 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 155 struct ip6_exthdrs exthdrs; 156 struct in6_addr finaldst; 157 struct route_in6 *ro_pmtu = NULL; 158 int hdrsplit = 0; 159 int needipsec = 0; 160 #ifdef IPSEC 161 int needipsectun = 0; 162 struct socket *so; 163 struct secpolicy *sp = NULL; 164 165 /* for AH processing. stupid to have "socket" variable in IP layer... */ 166 so = ipsec_getsocket(m); 167 ipsec_setsocket(m, NULL); 168 ip6 = mtod(m, struct ip6_hdr *); 169 #endif /* IPSEC */ 170 171 #define MAKE_EXTHDR(hp, mp) \ 172 do { \ 173 if (hp) { \ 174 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 175 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 176 ((eh)->ip6e_len + 1) << 3); \ 177 if (error) \ 178 goto freehdrs; \ 179 } \ 180 } while (0) 181 182 bzero(&exthdrs, sizeof(exthdrs)); 183 184 if (opt) { 185 /* Hop-by-Hop options header */ 186 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 187 /* Destination options header(1st part) */ 188 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 189 /* Routing header */ 190 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 191 /* Destination options header(2nd part) */ 192 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 193 } 194 195 #ifdef IPSEC 196 /* get a security policy for this packet */ 197 if (so == NULL) 198 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 199 else 200 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 201 202 if (sp == NULL) { 203 ipsec6stat.out_inval++; 204 goto freehdrs; 205 } 206 207 error = 0; 208 209 /* check policy */ 210 switch (sp->policy) { 211 case IPSEC_POLICY_DISCARD: 212 /* 213 * This packet is just discarded. 214 */ 215 ipsec6stat.out_polvio++; 216 goto freehdrs; 217 218 case IPSEC_POLICY_BYPASS: 219 case IPSEC_POLICY_NONE: 220 /* no need to do IPsec. */ 221 needipsec = 0; 222 break; 223 224 case IPSEC_POLICY_IPSEC: 225 if (sp->req == NULL) { 226 /* acquire a policy */ 227 error = key_spdacquire(sp); 228 goto freehdrs; 229 } 230 needipsec = 1; 231 break; 232 233 case IPSEC_POLICY_ENTRUST: 234 default: 235 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 236 } 237 #endif /* IPSEC */ 238 239 /* 240 * Calculate the total length of the extension header chain. 241 * Keep the length of the unfragmentable part for fragmentation. 242 */ 243 optlen = 0; 244 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 245 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 246 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 247 unfragpartlen = optlen + sizeof(struct ip6_hdr); 248 /* NOTE: we don't add AH/ESP length here. do that later. */ 249 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 250 251 /* 252 * If we need IPsec, or there is at least one extension header, 253 * separate IP6 header from the payload. 254 */ 255 if ((needipsec || optlen) && !hdrsplit) { 256 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 257 m = NULL; 258 goto freehdrs; 259 } 260 m = exthdrs.ip6e_ip6; 261 hdrsplit++; 262 } 263 264 /* adjust pointer */ 265 ip6 = mtod(m, struct ip6_hdr *); 266 267 /* adjust mbuf packet header length */ 268 m->m_pkthdr.len += optlen; 269 plen = m->m_pkthdr.len - sizeof(*ip6); 270 271 /* If this is a jumbo payload, insert a jumbo payload option. */ 272 if (plen > IPV6_MAXPACKET) { 273 if (!hdrsplit) { 274 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 275 m = NULL; 276 goto freehdrs; 277 } 278 m = exthdrs.ip6e_ip6; 279 hdrsplit++; 280 } 281 /* adjust pointer */ 282 ip6 = mtod(m, struct ip6_hdr *); 283 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 284 goto freehdrs; 285 ip6->ip6_plen = 0; 286 } else 287 ip6->ip6_plen = htons(plen); 288 289 /* 290 * Concatenate headers and fill in next header fields. 291 * Here we have, on "m" 292 * IPv6 payload 293 * and we insert headers accordingly. Finally, we should be getting: 294 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 295 * 296 * during the header composing process, "m" points to IPv6 header. 297 * "mprev" points to an extension header prior to esp. 298 */ 299 { 300 u_char *nexthdrp = &ip6->ip6_nxt; 301 struct mbuf *mprev = m; 302 303 /* 304 * we treat dest2 specially. this makes IPsec processing 305 * much easier. 306 * 307 * result: IPv6 dest2 payload 308 * m and mprev will point to IPv6 header. 309 */ 310 if (exthdrs.ip6e_dest2) { 311 if (!hdrsplit) 312 panic("assumption failed: hdr not split"); 313 exthdrs.ip6e_dest2->m_next = m->m_next; 314 m->m_next = exthdrs.ip6e_dest2; 315 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 316 ip6->ip6_nxt = IPPROTO_DSTOPTS; 317 } 318 319 #define MAKE_CHAIN(m, mp, p, i)\ 320 do {\ 321 if (m) {\ 322 if (!hdrsplit) \ 323 panic("assumption failed: hdr not split"); \ 324 *mtod((m), u_char *) = *(p);\ 325 *(p) = (i);\ 326 p = mtod((m), u_char *);\ 327 (m)->m_next = (mp)->m_next;\ 328 (mp)->m_next = (m);\ 329 (mp) = (m);\ 330 }\ 331 } while (0) 332 /* 333 * result: IPv6 hbh dest1 rthdr dest2 payload 334 * m will point to IPv6 header. mprev will point to the 335 * extension header prior to dest2 (rthdr in the above case). 336 */ 337 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 338 nexthdrp, IPPROTO_HOPOPTS); 339 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 340 nexthdrp, IPPROTO_DSTOPTS); 341 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 342 nexthdrp, IPPROTO_ROUTING); 343 344 #ifdef IPSEC 345 if (!needipsec) 346 goto skip_ipsec2; 347 348 /* 349 * pointers after IPsec headers are not valid any more. 350 * other pointers need a great care too. 351 * (IPsec routines should not mangle mbufs prior to AH/ESP) 352 */ 353 exthdrs.ip6e_dest2 = NULL; 354 355 { 356 struct ip6_rthdr *rh = NULL; 357 int segleft_org = 0; 358 struct ipsec_output_state state; 359 360 if (exthdrs.ip6e_rthdr) { 361 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 362 segleft_org = rh->ip6r_segleft; 363 rh->ip6r_segleft = 0; 364 } 365 366 bzero(&state, sizeof(state)); 367 state.m = m; 368 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 369 &needipsectun); 370 m = state.m; 371 if (error) { 372 /* mbuf is already reclaimed in ipsec6_output_trans. */ 373 m = NULL; 374 switch (error) { 375 case EHOSTUNREACH: 376 case ENETUNREACH: 377 case EMSGSIZE: 378 case ENOBUFS: 379 case ENOMEM: 380 break; 381 default: 382 printf("ip6_output (ipsec): error code %d\n", error); 383 /*fall through*/ 384 case ENOENT: 385 /* don't show these error codes to the user */ 386 error = 0; 387 break; 388 } 389 goto bad; 390 } 391 if (exthdrs.ip6e_rthdr) { 392 /* ah6_output doesn't modify mbuf chain */ 393 rh->ip6r_segleft = segleft_org; 394 } 395 } 396 skip_ipsec2:; 397 #endif 398 } 399 400 /* 401 * If there is a routing header, replace destination address field 402 * with the first hop of the routing header. 403 */ 404 if (exthdrs.ip6e_rthdr) { 405 struct ip6_rthdr *rh = 406 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 407 struct ip6_rthdr *)); 408 struct ip6_rthdr0 *rh0; 409 410 finaldst = ip6->ip6_dst; 411 switch(rh->ip6r_type) { 412 case IPV6_RTHDR_TYPE_0: 413 rh0 = (struct ip6_rthdr0 *)rh; 414 ip6->ip6_dst = rh0->ip6r0_addr[0]; 415 bcopy((caddr_t)&rh0->ip6r0_addr[1], 416 (caddr_t)&rh0->ip6r0_addr[0], 417 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 418 ); 419 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 420 break; 421 default: /* is it possible? */ 422 error = EINVAL; 423 goto bad; 424 } 425 } 426 427 /* Source address validation */ 428 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 429 (flags & IPV6_DADOUTPUT) == 0) { 430 error = EOPNOTSUPP; 431 ip6stat.ip6s_badscope++; 432 goto bad; 433 } 434 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 435 error = EOPNOTSUPP; 436 ip6stat.ip6s_badscope++; 437 goto bad; 438 } 439 440 ip6stat.ip6s_localout++; 441 442 /* 443 * Route packet. 444 */ 445 if (ro == 0) { 446 ro = &ip6route; 447 bzero((caddr_t)ro, sizeof(*ro)); 448 } 449 ro_pmtu = ro; 450 if (opt && opt->ip6po_rthdr) 451 ro = &opt->ip6po_route; 452 dst = (struct sockaddr_in6 *)&ro->ro_dst; 453 /* 454 * If there is a cached route, 455 * check that it is to the same destination 456 * and is still up. If not, free it and try again. 457 */ 458 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 459 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 460 RTFREE(ro->ro_rt); 461 ro->ro_rt = (struct rtentry *)0; 462 } 463 if (ro->ro_rt == 0) { 464 bzero(dst, sizeof(*dst)); 465 dst->sin6_family = AF_INET6; 466 dst->sin6_len = sizeof(struct sockaddr_in6); 467 dst->sin6_addr = ip6->ip6_dst; 468 #ifdef SCOPEDROUTING 469 /* XXX: sin6_scope_id should already be fixed at this point */ 470 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 471 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 472 #endif 473 } 474 #ifdef IPSEC 475 if (needipsec && needipsectun) { 476 struct ipsec_output_state state; 477 478 /* 479 * All the extension headers will become inaccessible 480 * (since they can be encrypted). 481 * Don't panic, we need no more updates to extension headers 482 * on inner IPv6 packet (since they are now encapsulated). 483 * 484 * IPv6 [ESP|AH] IPv6 [extension headers] payload 485 */ 486 bzero(&exthdrs, sizeof(exthdrs)); 487 exthdrs.ip6e_ip6 = m; 488 489 bzero(&state, sizeof(state)); 490 state.m = m; 491 state.ro = (struct route *)ro; 492 state.dst = (struct sockaddr *)dst; 493 494 error = ipsec6_output_tunnel(&state, sp, flags); 495 496 m = state.m; 497 ro = (struct route_in6 *)state.ro; 498 dst = (struct sockaddr_in6 *)state.dst; 499 if (error) { 500 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 501 m0 = m = NULL; 502 m = NULL; 503 switch (error) { 504 case EHOSTUNREACH: 505 case ENETUNREACH: 506 case EMSGSIZE: 507 case ENOBUFS: 508 case ENOMEM: 509 break; 510 default: 511 printf("ip6_output (ipsec): error code %d\n", error); 512 /*fall through*/ 513 case ENOENT: 514 /* don't show these error codes to the user */ 515 error = 0; 516 break; 517 } 518 goto bad; 519 } 520 521 exthdrs.ip6e_ip6 = m; 522 } 523 #endif /*IPSEC*/ 524 525 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 526 /* Unicast */ 527 528 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 529 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 530 /* xxx 531 * interface selection comes here 532 * if an interface is specified from an upper layer, 533 * ifp must point it. 534 */ 535 if (ro->ro_rt == 0) { 536 /* 537 * non-bsdi always clone routes, if parent is 538 * PRF_CLONING. 539 */ 540 rtalloc((struct route *)ro); 541 } 542 if (ro->ro_rt == 0) { 543 ip6stat.ip6s_noroute++; 544 error = EHOSTUNREACH; 545 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 546 goto bad; 547 } 548 ia = ifatoia6(ro->ro_rt->rt_ifa); 549 ifp = ro->ro_rt->rt_ifp; 550 ro->ro_rt->rt_use++; 551 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 552 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 553 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 554 555 in6_ifstat_inc(ifp, ifs6_out_request); 556 557 /* 558 * Check if the outgoing interface conflicts with 559 * the interface specified by ifi6_ifindex (if specified). 560 * Note that loopback interface is always okay. 561 * (this may happen when we are sending a packet to one of 562 * our own addresses.) 563 */ 564 if (opt && opt->ip6po_pktinfo 565 && opt->ip6po_pktinfo->ipi6_ifindex) { 566 if (!(ifp->if_flags & IFF_LOOPBACK) 567 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 568 ip6stat.ip6s_noroute++; 569 in6_ifstat_inc(ifp, ifs6_out_discard); 570 error = EHOSTUNREACH; 571 goto bad; 572 } 573 } 574 575 if (opt && opt->ip6po_hlim != -1) 576 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 577 } else { 578 /* Multicast */ 579 struct in6_multi *in6m; 580 581 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 582 583 /* 584 * See if the caller provided any multicast options 585 */ 586 ifp = NULL; 587 if (im6o != NULL) { 588 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 589 if (im6o->im6o_multicast_ifp != NULL) 590 ifp = im6o->im6o_multicast_ifp; 591 } else 592 ip6->ip6_hlim = ip6_defmcasthlim; 593 594 /* 595 * See if the caller provided the outgoing interface 596 * as an ancillary data. 597 * Boundary check for ifindex is assumed to be already done. 598 */ 599 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 600 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 601 602 /* 603 * If the destination is a node-local scope multicast, 604 * the packet should be loop-backed only. 605 */ 606 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 607 /* 608 * If the outgoing interface is already specified, 609 * it should be a loopback interface. 610 */ 611 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 612 ip6stat.ip6s_badscope++; 613 error = ENETUNREACH; /* XXX: better error? */ 614 /* XXX correct ifp? */ 615 in6_ifstat_inc(ifp, ifs6_out_discard); 616 goto bad; 617 } else { 618 ifp = &loif[0]; 619 } 620 } 621 622 if (opt && opt->ip6po_hlim != -1) 623 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 624 625 /* 626 * If caller did not provide an interface lookup a 627 * default in the routing table. This is either a 628 * default for the speicfied group (i.e. a host 629 * route), or a multicast default (a route for the 630 * ``net'' ff00::/8). 631 */ 632 if (ifp == NULL) { 633 if (ro->ro_rt == 0) { 634 ro->ro_rt = rtalloc1((struct sockaddr *) 635 &ro->ro_dst, 0, 0UL); 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 > ifmtu) { 738 /* 739 * The MTU on the route is larger than the MTU on 740 * the interface! This shouldn't happen, unless the 741 * MTU of the interface has been changed after the 742 * interface was brought up. Change the MTU in the 743 * route to match the interface MTU (as long as the 744 * field isn't locked). 745 */ 746 mtu = ifmtu; 747 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 748 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 749 } 750 } else { 751 mtu = nd_ifinfo[ifp->if_index].linkmtu; 752 } 753 754 /* Fake scoped addresses */ 755 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 756 /* 757 * If source or destination address is a scoped address, and 758 * the packet is going to be sent to a loopback interface, 759 * we should keep the original interface. 760 */ 761 762 /* 763 * XXX: this is a very experimental and temporary solution. 764 * We eventually have sockaddr_in6 and use the sin6_scope_id 765 * field of the structure here. 766 * We rely on the consistency between two scope zone ids 767 * of source add destination, which should already be assured 768 * Larger scopes than link will be supported in the near 769 * future. 770 */ 771 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 772 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 773 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 774 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 775 else 776 origifp = ifp; 777 } 778 else 779 origifp = ifp; 780 #ifndef FAKE_LOOPBACK_IF 781 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 782 #else 783 if (1) 784 #endif 785 { 786 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 787 ip6->ip6_src.s6_addr16[1] = 0; 788 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 789 ip6->ip6_dst.s6_addr16[1] = 0; 790 } 791 792 #ifdef IPV6FIREWALL 793 /* 794 * Check with the firewall... 795 */ 796 if (ip6_fw_chk_ptr) { 797 u_short port = 0; 798 m->m_pkthdr.rcvif = NULL; /*XXX*/ 799 /* If ipfw says divert, we have to just drop packet */ 800 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 801 m_freem(m); 802 goto done; 803 } 804 if (!m) { 805 error = EACCES; 806 goto done; 807 } 808 } 809 #endif 810 811 /* 812 * If the outgoing packet contains a hop-by-hop options header, 813 * it must be examined and processed even by the source node. 814 * (RFC 2460, section 4.) 815 */ 816 if (exthdrs.ip6e_hbh) { 817 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, 818 struct ip6_hbh *); 819 u_int32_t dummy1; /* XXX unused */ 820 u_int32_t dummy2; /* XXX unused */ 821 822 /* 823 * XXX: if we have to send an ICMPv6 error to the sender, 824 * we need the M_LOOP flag since icmp6_error() expects 825 * the IPv6 and the hop-by-hop options header are 826 * continuous unless the flag is set. 827 */ 828 m->m_flags |= M_LOOP; 829 m->m_pkthdr.rcvif = ifp; 830 if (ip6_process_hopopts(m, 831 (u_int8_t *)(hbh + 1), 832 ((hbh->ip6h_len + 1) << 3) - 833 sizeof(struct ip6_hbh), 834 &dummy1, &dummy2) < 0) { 835 /* m was already freed at this point */ 836 error = EINVAL;/* better error? */ 837 goto done; 838 } 839 m->m_flags &= ~M_LOOP; /* XXX */ 840 m->m_pkthdr.rcvif = NULL; 841 } 842 843 /* 844 * Send the packet to the outgoing interface. 845 * If necessary, do IPv6 fragmentation before sending. 846 */ 847 tlen = m->m_pkthdr.len; 848 if (tlen <= mtu 849 #ifdef notyet 850 /* 851 * On any link that cannot convey a 1280-octet packet in one piece, 852 * link-specific fragmentation and reassembly must be provided at 853 * a layer below IPv6. [RFC 2460, sec.5] 854 * Thus if the interface has ability of link-level fragmentation, 855 * we can just send the packet even if the packet size is 856 * larger than the link's MTU. 857 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 858 */ 859 860 || ifp->if_flags & IFF_FRAGMENTABLE 861 #endif 862 ) 863 { 864 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 865 goto done; 866 } else if (mtu < IPV6_MMTU) { 867 /* 868 * note that path MTU is never less than IPV6_MMTU 869 * (see icmp6_input). 870 */ 871 error = EMSGSIZE; 872 in6_ifstat_inc(ifp, ifs6_out_fragfail); 873 goto bad; 874 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 875 error = EMSGSIZE; 876 in6_ifstat_inc(ifp, ifs6_out_fragfail); 877 goto bad; 878 } else { 879 struct mbuf **mnext, *m_frgpart; 880 struct ip6_frag *ip6f; 881 u_int32_t id = htonl(ip6_id++); 882 u_char nextproto; 883 884 /* 885 * Too large for the destination or interface; 886 * fragment if possible. 887 * Must be able to put at least 8 bytes per fragment. 888 */ 889 hlen = unfragpartlen; 890 if (mtu > IPV6_MAXPACKET) 891 mtu = IPV6_MAXPACKET; 892 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 893 if (len < 8) { 894 error = EMSGSIZE; 895 in6_ifstat_inc(ifp, ifs6_out_fragfail); 896 goto bad; 897 } 898 899 mnext = &m->m_nextpkt; 900 901 /* 902 * Change the next header field of the last header in the 903 * unfragmentable part. 904 */ 905 if (exthdrs.ip6e_rthdr) { 906 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 907 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 908 } else if (exthdrs.ip6e_dest1) { 909 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 910 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 911 } else if (exthdrs.ip6e_hbh) { 912 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 913 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 914 } else { 915 nextproto = ip6->ip6_nxt; 916 ip6->ip6_nxt = IPPROTO_FRAGMENT; 917 } 918 919 /* 920 * Loop through length of segment after first fragment, 921 * make new header and copy data of each part and link onto chain. 922 */ 923 m0 = m; 924 for (off = hlen; off < tlen; off += len) { 925 MGETHDR(m, M_DONTWAIT, MT_HEADER); 926 if (!m) { 927 error = ENOBUFS; 928 ip6stat.ip6s_odropped++; 929 goto sendorfree; 930 } 931 m->m_flags = m0->m_flags & M_COPYFLAGS; 932 *mnext = m; 933 mnext = &m->m_nextpkt; 934 m->m_data += max_linkhdr; 935 mhip6 = mtod(m, struct ip6_hdr *); 936 *mhip6 = *ip6; 937 m->m_len = sizeof(*mhip6); 938 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 939 if (error) { 940 ip6stat.ip6s_odropped++; 941 goto sendorfree; 942 } 943 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 944 if (off + len >= tlen) 945 len = tlen - off; 946 else 947 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 948 mhip6->ip6_plen = htons((u_short)(len + hlen + 949 sizeof(*ip6f) - 950 sizeof(struct ip6_hdr))); 951 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 952 error = ENOBUFS; 953 ip6stat.ip6s_odropped++; 954 goto sendorfree; 955 } 956 m_cat(m, m_frgpart); 957 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 958 m->m_pkthdr.rcvif = (struct ifnet *)0; 959 ip6f->ip6f_reserved = 0; 960 ip6f->ip6f_ident = id; 961 ip6f->ip6f_nxt = nextproto; 962 ip6stat.ip6s_ofragments++; 963 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 964 } 965 966 in6_ifstat_inc(ifp, ifs6_out_fragok); 967 } 968 969 /* 970 * Remove leading garbages. 971 */ 972 sendorfree: 973 m = m0->m_nextpkt; 974 m0->m_nextpkt = 0; 975 m_freem(m0); 976 for (m0 = m; m; m = m0) { 977 m0 = m->m_nextpkt; 978 m->m_nextpkt = 0; 979 if (error == 0) { 980 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 981 } else 982 m_freem(m); 983 } 984 985 if (error == 0) 986 ip6stat.ip6s_fragmented++; 987 988 done: 989 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 990 RTFREE(ro->ro_rt); 991 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 992 RTFREE(ro_pmtu->ro_rt); 993 } 994 995 #ifdef IPSEC 996 if (sp != NULL) 997 key_freesp(sp); 998 #endif /* IPSEC */ 999 1000 return(error); 1001 1002 freehdrs: 1003 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1004 m_freem(exthdrs.ip6e_dest1); 1005 m_freem(exthdrs.ip6e_rthdr); 1006 m_freem(exthdrs.ip6e_dest2); 1007 /* fall through */ 1008 bad: 1009 m_freem(m); 1010 goto done; 1011 } 1012 1013 static int 1014 ip6_copyexthdr(mp, hdr, hlen) 1015 struct mbuf **mp; 1016 caddr_t hdr; 1017 int hlen; 1018 { 1019 struct mbuf *m; 1020 1021 if (hlen > MCLBYTES) 1022 return(ENOBUFS); /* XXX */ 1023 1024 MGET(m, M_DONTWAIT, MT_DATA); 1025 if (!m) 1026 return(ENOBUFS); 1027 1028 if (hlen > MLEN) { 1029 MCLGET(m, M_DONTWAIT); 1030 if ((m->m_flags & M_EXT) == 0) { 1031 m_free(m); 1032 return(ENOBUFS); 1033 } 1034 } 1035 m->m_len = hlen; 1036 if (hdr) 1037 bcopy(hdr, mtod(m, caddr_t), hlen); 1038 1039 *mp = m; 1040 return(0); 1041 } 1042 1043 /* 1044 * Insert jumbo payload option. 1045 */ 1046 static int 1047 ip6_insert_jumboopt(exthdrs, plen) 1048 struct ip6_exthdrs *exthdrs; 1049 u_int32_t plen; 1050 { 1051 struct mbuf *mopt; 1052 u_char *optbuf; 1053 1054 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1055 1056 /* 1057 * If there is no hop-by-hop options header, allocate new one. 1058 * If there is one but it doesn't have enough space to store the 1059 * jumbo payload option, allocate a cluster to store the whole options. 1060 * Otherwise, use it to store the options. 1061 */ 1062 if (exthdrs->ip6e_hbh == 0) { 1063 MGET(mopt, M_DONTWAIT, MT_DATA); 1064 if (mopt == 0) 1065 return(ENOBUFS); 1066 mopt->m_len = JUMBOOPTLEN; 1067 optbuf = mtod(mopt, u_char *); 1068 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1069 exthdrs->ip6e_hbh = mopt; 1070 } else { 1071 struct ip6_hbh *hbh; 1072 1073 mopt = exthdrs->ip6e_hbh; 1074 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1075 caddr_t oldoptp = mtod(mopt, caddr_t); 1076 int oldoptlen = mopt->m_len; 1077 1078 if (mopt->m_flags & M_EXT) 1079 return(ENOBUFS); /* XXX */ 1080 MCLGET(mopt, M_DONTWAIT); 1081 if ((mopt->m_flags & M_EXT) == 0) 1082 return(ENOBUFS); 1083 1084 bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); 1085 optbuf = mtod(mopt, caddr_t) + oldoptlen; 1086 mopt->m_len = oldoptlen + JUMBOOPTLEN; 1087 } else { 1088 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1089 mopt->m_len += JUMBOOPTLEN; 1090 } 1091 optbuf[0] = IP6OPT_PADN; 1092 optbuf[1] = 1; 1093 1094 /* 1095 * Adjust the header length according to the pad and 1096 * the jumbo payload option. 1097 */ 1098 hbh = mtod(mopt, struct ip6_hbh *); 1099 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1100 } 1101 1102 /* fill in the option. */ 1103 optbuf[2] = IP6OPT_JUMBO; 1104 optbuf[3] = 4; 1105 *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); 1106 1107 /* finally, adjust the packet header length */ 1108 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1109 1110 return(0); 1111 #undef JUMBOOPTLEN 1112 } 1113 1114 /* 1115 * Insert fragment header and copy unfragmentable header portions. 1116 */ 1117 static int 1118 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1119 struct mbuf *m0, *m; 1120 int hlen; 1121 struct ip6_frag **frghdrp; 1122 { 1123 struct mbuf *n, *mlast; 1124 1125 if (hlen > sizeof(struct ip6_hdr)) { 1126 n = m_copym(m0, sizeof(struct ip6_hdr), 1127 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1128 if (n == 0) 1129 return(ENOBUFS); 1130 m->m_next = n; 1131 } else 1132 n = m; 1133 1134 /* Search for the last mbuf of unfragmentable part. */ 1135 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1136 ; 1137 1138 if ((mlast->m_flags & M_EXT) == 0 && 1139 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1140 /* use the trailing space of the last mbuf for the fragment hdr */ 1141 *frghdrp = 1142 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1143 mlast->m_len += sizeof(struct ip6_frag); 1144 m->m_pkthdr.len += sizeof(struct ip6_frag); 1145 } else { 1146 /* allocate a new mbuf for the fragment header */ 1147 struct mbuf *mfrg; 1148 1149 MGET(mfrg, M_DONTWAIT, MT_DATA); 1150 if (mfrg == 0) 1151 return(ENOBUFS); 1152 mfrg->m_len = sizeof(struct ip6_frag); 1153 *frghdrp = mtod(mfrg, struct ip6_frag *); 1154 mlast->m_next = mfrg; 1155 } 1156 1157 return(0); 1158 } 1159 1160 /* 1161 * IP6 socket option processing. 1162 */ 1163 int 1164 ip6_ctloutput(so, sopt) 1165 struct socket *so; 1166 struct sockopt *sopt; 1167 { 1168 int privileged; 1169 register struct inpcb *in6p = sotoinpcb(so); 1170 int error, optval; 1171 int level, op, optname; 1172 int optlen; 1173 struct proc *p; 1174 1175 if (sopt) { 1176 level = sopt->sopt_level; 1177 op = sopt->sopt_dir; 1178 optname = sopt->sopt_name; 1179 optlen = sopt->sopt_valsize; 1180 p = sopt->sopt_p; 1181 } else { 1182 panic("ip6_ctloutput: arg soopt is NULL"); 1183 } 1184 error = optval = 0; 1185 1186 privileged = (p == 0 || suser(p)) ? 0 : 1; 1187 1188 if (level == IPPROTO_IPV6) { 1189 switch (op) { 1190 case SOPT_SET: 1191 switch (optname) { 1192 case IPV6_PKTOPTIONS: 1193 { 1194 struct mbuf *m; 1195 1196 error = soopt_getm(sopt, &m); /* XXX */ 1197 if (error != 0) 1198 break; 1199 error = soopt_mcopyin(sopt, m); /* XXX */ 1200 if (error != 0) 1201 break; 1202 return (ip6_pcbopts(&in6p->in6p_outputopts, 1203 m, so, sopt)); 1204 } 1205 case IPV6_HOPOPTS: 1206 case IPV6_DSTOPTS: 1207 if (!privileged) { 1208 error = EPERM; 1209 break; 1210 } 1211 /* fall through */ 1212 case IPV6_UNICAST_HOPS: 1213 case IPV6_PKTINFO: 1214 case IPV6_HOPLIMIT: 1215 case IPV6_RTHDR: 1216 case IPV6_CHECKSUM: 1217 case IPV6_FAITH: 1218 case IPV6_BINDV6ONLY: 1219 if (optlen != sizeof(int)) 1220 error = EINVAL; 1221 else { 1222 error = sooptcopyin(sopt, &optval, 1223 sizeof optval, sizeof optval); 1224 if (error) 1225 break; 1226 switch (optname) { 1227 1228 case IPV6_UNICAST_HOPS: 1229 if (optval < -1 || optval >= 256) 1230 error = EINVAL; 1231 else { 1232 /* -1 = kernel default */ 1233 in6p->in6p_hops = optval; 1234 if ((in6p->in6p_vflag & 1235 INP_IPV4) != 0) 1236 in6p->inp_ip_ttl = optval; 1237 } 1238 break; 1239 #define OPTSET(bit) \ 1240 if (optval) \ 1241 in6p->in6p_flags |= bit; \ 1242 else \ 1243 in6p->in6p_flags &= ~bit; 1244 1245 case IPV6_PKTINFO: 1246 OPTSET(IN6P_PKTINFO); 1247 break; 1248 1249 case IPV6_HOPLIMIT: 1250 OPTSET(IN6P_HOPLIMIT); 1251 break; 1252 1253 case IPV6_HOPOPTS: 1254 OPTSET(IN6P_HOPOPTS); 1255 break; 1256 1257 case IPV6_DSTOPTS: 1258 OPTSET(IN6P_DSTOPTS); 1259 break; 1260 1261 case IPV6_RTHDR: 1262 OPTSET(IN6P_RTHDR); 1263 break; 1264 1265 case IPV6_CHECKSUM: 1266 in6p->in6p_cksum = optval; 1267 break; 1268 1269 case IPV6_FAITH: 1270 OPTSET(IN6P_FAITH); 1271 break; 1272 1273 case IPV6_BINDV6ONLY: 1274 OPTSET(IN6P_BINDV6ONLY); 1275 break; 1276 } 1277 } 1278 break; 1279 #undef OPTSET 1280 1281 case IPV6_MULTICAST_IF: 1282 case IPV6_MULTICAST_HOPS: 1283 case IPV6_MULTICAST_LOOP: 1284 case IPV6_JOIN_GROUP: 1285 case IPV6_LEAVE_GROUP: 1286 { 1287 struct mbuf *m; 1288 if (sopt->sopt_valsize > MLEN) { 1289 error = EMSGSIZE; 1290 break; 1291 } 1292 /* XXX */ 1293 MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); 1294 if (m == 0) { 1295 error = ENOBUFS; 1296 break; 1297 } 1298 m->m_len = sopt->sopt_valsize; 1299 error = sooptcopyin(sopt, mtod(m, char *), 1300 m->m_len, m->m_len); 1301 error = ip6_setmoptions(sopt->sopt_name, 1302 &in6p->in6p_moptions, 1303 m); 1304 (void)m_free(m); 1305 } 1306 break; 1307 1308 case IPV6_PORTRANGE: 1309 error = sooptcopyin(sopt, &optval, 1310 sizeof optval, sizeof optval); 1311 if (error) 1312 break; 1313 1314 switch (optval) { 1315 case IPV6_PORTRANGE_DEFAULT: 1316 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1317 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1318 break; 1319 1320 case IPV6_PORTRANGE_HIGH: 1321 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1322 in6p->in6p_flags |= IN6P_HIGHPORT; 1323 break; 1324 1325 case IPV6_PORTRANGE_LOW: 1326 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1327 in6p->in6p_flags |= IN6P_LOWPORT; 1328 break; 1329 1330 default: 1331 error = EINVAL; 1332 break; 1333 } 1334 break; 1335 1336 #ifdef IPSEC 1337 case IPV6_IPSEC_POLICY: 1338 { 1339 caddr_t req = NULL; 1340 size_t len = 0; 1341 struct mbuf *m; 1342 1343 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1344 break; 1345 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1346 break; 1347 if (m) { 1348 req = mtod(m, caddr_t); 1349 len = m->m_len; 1350 } 1351 error = ipsec6_set_policy(in6p, optname, req, 1352 len, privileged); 1353 m_freem(m); 1354 } 1355 break; 1356 #endif /* IPSEC */ 1357 1358 #ifdef IPV6FIREWALL 1359 case IPV6_FW_ADD: 1360 case IPV6_FW_DEL: 1361 case IPV6_FW_FLUSH: 1362 case IPV6_FW_ZERO: 1363 { 1364 struct mbuf *m; 1365 struct mbuf **mp = &m; 1366 1367 if (ip6_fw_ctl_ptr == NULL) 1368 return EINVAL; 1369 if ((error = soopt_getm(sopt, &m)) 1370 != 0) /* XXX */ 1371 break; 1372 if ((error = soopt_mcopyin(sopt, m)) 1373 != 0) /* XXX */ 1374 break; 1375 error = (*ip6_fw_ctl_ptr)(optname, mp); 1376 m = *mp; 1377 } 1378 break; 1379 #endif 1380 1381 default: 1382 error = ENOPROTOOPT; 1383 break; 1384 } 1385 break; 1386 1387 case SOPT_GET: 1388 switch (optname) { 1389 1390 case IPV6_PKTOPTIONS: 1391 if (in6p->in6p_options) { 1392 error = soopt_mcopyout(sopt, 1393 in6p->in6p_options); 1394 } else 1395 sopt->sopt_valsize = 0; 1396 break; 1397 1398 case IPV6_HOPOPTS: 1399 case IPV6_DSTOPTS: 1400 if (!privileged) { 1401 error = EPERM; 1402 break; 1403 } 1404 /* fall through */ 1405 case IPV6_UNICAST_HOPS: 1406 case IPV6_PKTINFO: 1407 case IPV6_HOPLIMIT: 1408 case IPV6_RTHDR: 1409 case IPV6_CHECKSUM: 1410 case IPV6_FAITH: 1411 case IPV6_BINDV6ONLY: 1412 case IPV6_PORTRANGE: 1413 switch (optname) { 1414 1415 case IPV6_UNICAST_HOPS: 1416 optval = in6p->in6p_hops; 1417 break; 1418 1419 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1420 1421 case IPV6_PKTINFO: 1422 optval = OPTBIT(IN6P_PKTINFO); 1423 break; 1424 1425 case IPV6_HOPLIMIT: 1426 optval = OPTBIT(IN6P_HOPLIMIT); 1427 break; 1428 1429 case IPV6_HOPOPTS: 1430 optval = OPTBIT(IN6P_HOPOPTS); 1431 break; 1432 1433 case IPV6_DSTOPTS: 1434 optval = OPTBIT(IN6P_DSTOPTS); 1435 break; 1436 1437 case IPV6_RTHDR: 1438 optval = OPTBIT(IN6P_RTHDR); 1439 break; 1440 1441 case IPV6_CHECKSUM: 1442 optval = in6p->in6p_cksum; 1443 break; 1444 1445 case IPV6_FAITH: 1446 optval = OPTBIT(IN6P_FAITH); 1447 break; 1448 1449 case IPV6_BINDV6ONLY: 1450 optval = OPTBIT(IN6P_BINDV6ONLY); 1451 break; 1452 1453 case IPV6_PORTRANGE: 1454 { 1455 int flags; 1456 1457 flags = in6p->in6p_flags; 1458 if (flags & IN6P_HIGHPORT) 1459 optval = IPV6_PORTRANGE_HIGH; 1460 else if (flags & IN6P_LOWPORT) 1461 optval = IPV6_PORTRANGE_LOW; 1462 else 1463 optval = 0; 1464 break; 1465 } 1466 } 1467 error = sooptcopyout(sopt, &optval, 1468 sizeof optval); 1469 break; 1470 1471 case IPV6_MULTICAST_IF: 1472 case IPV6_MULTICAST_HOPS: 1473 case IPV6_MULTICAST_LOOP: 1474 case IPV6_JOIN_GROUP: 1475 case IPV6_LEAVE_GROUP: 1476 { 1477 struct mbuf *m; 1478 error = ip6_getmoptions(sopt->sopt_name, 1479 in6p->in6p_moptions, &m); 1480 if (error == 0) 1481 error = sooptcopyout(sopt, 1482 mtod(m, char *), m->m_len); 1483 m_freem(m); 1484 } 1485 break; 1486 1487 #ifdef IPSEC 1488 case IPV6_IPSEC_POLICY: 1489 { 1490 caddr_t req = NULL; 1491 size_t len = 0; 1492 struct mbuf *m = NULL; 1493 struct mbuf **mp = &m; 1494 1495 error = soopt_getm(sopt, &m); /* XXX */ 1496 if (error != NULL) 1497 break; 1498 error = soopt_mcopyin(sopt, m); /* XXX */ 1499 if (error != NULL) 1500 break; 1501 if (m) { 1502 req = mtod(m, caddr_t); 1503 len = m->m_len; 1504 } 1505 error = ipsec6_get_policy(in6p, req, len, mp); 1506 if (error == 0) 1507 error = soopt_mcopyout(sopt, m); /*XXX*/ 1508 m_freem(m); 1509 break; 1510 } 1511 #endif /* IPSEC */ 1512 1513 #ifdef IPV6FIREWALL 1514 case IPV6_FW_GET: 1515 { 1516 struct mbuf *m; 1517 struct mbuf **mp = &m; 1518 1519 if (ip6_fw_ctl_ptr == NULL) 1520 { 1521 return EINVAL; 1522 } 1523 error = (*ip6_fw_ctl_ptr)(optname, mp); 1524 if (error == 0) 1525 error = soopt_mcopyout(sopt, m); /* XXX */ 1526 if (m) 1527 m_freem(m); 1528 } 1529 break; 1530 #endif 1531 1532 default: 1533 error = ENOPROTOOPT; 1534 break; 1535 } 1536 break; 1537 } 1538 } else { 1539 error = EINVAL; 1540 } 1541 return(error); 1542 } 1543 1544 /* 1545 * Set up IP6 options in pcb for insertion in output packets. 1546 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1547 * with destination address if source routed. 1548 */ 1549 static int 1550 ip6_pcbopts(pktopt, m, so, sopt) 1551 struct ip6_pktopts **pktopt; 1552 register struct mbuf *m; 1553 struct socket *so; 1554 struct sockopt *sopt; 1555 { 1556 register struct ip6_pktopts *opt = *pktopt; 1557 int error = 0; 1558 struct proc *p = sopt->sopt_p; 1559 int priv = 0; 1560 1561 /* turn off any old options. */ 1562 if (opt) { 1563 if (opt->ip6po_m) 1564 (void)m_free(opt->ip6po_m); 1565 } else 1566 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1567 *pktopt = 0; 1568 1569 if (!m || m->m_len == 0) { 1570 /* 1571 * Only turning off any previous options. 1572 */ 1573 if (opt) 1574 free(opt, M_IP6OPT); 1575 if (m) 1576 (void)m_free(m); 1577 return(0); 1578 } 1579 1580 /* set options specified by user. */ 1581 if (p && !suser(p)) 1582 priv = 1; 1583 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1584 (void)m_free(m); 1585 return(error); 1586 } 1587 *pktopt = opt; 1588 return(0); 1589 } 1590 1591 /* 1592 * Set the IP6 multicast options in response to user setsockopt(). 1593 */ 1594 static int 1595 ip6_setmoptions(optname, im6op, m) 1596 int optname; 1597 struct ip6_moptions **im6op; 1598 struct mbuf *m; 1599 { 1600 int error = 0; 1601 u_int loop, ifindex; 1602 struct ipv6_mreq *mreq; 1603 struct ifnet *ifp; 1604 struct ip6_moptions *im6o = *im6op; 1605 struct route_in6 ro; 1606 struct sockaddr_in6 *dst; 1607 struct in6_multi_mship *imm; 1608 struct proc *p = curproc; /* XXX */ 1609 1610 if (im6o == NULL) { 1611 /* 1612 * No multicast option buffer attached to the pcb; 1613 * allocate one and initialize to default values. 1614 */ 1615 im6o = (struct ip6_moptions *) 1616 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1617 1618 if (im6o == NULL) 1619 return(ENOBUFS); 1620 *im6op = im6o; 1621 im6o->im6o_multicast_ifp = NULL; 1622 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1623 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1624 LIST_INIT(&im6o->im6o_memberships); 1625 } 1626 1627 switch (optname) { 1628 1629 case IPV6_MULTICAST_IF: 1630 /* 1631 * Select the interface for outgoing multicast packets. 1632 */ 1633 if (m == NULL || m->m_len != sizeof(u_int)) { 1634 error = EINVAL; 1635 break; 1636 } 1637 ifindex = *(mtod(m, u_int *)); 1638 if (ifindex < 0 || if_index < ifindex) { 1639 error = ENXIO; /* XXX EINVAL? */ 1640 break; 1641 } 1642 ifp = ifindex2ifnet[ifindex]; 1643 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1644 error = EADDRNOTAVAIL; 1645 break; 1646 } 1647 im6o->im6o_multicast_ifp = ifp; 1648 break; 1649 1650 case IPV6_MULTICAST_HOPS: 1651 { 1652 /* 1653 * Set the IP6 hoplimit for outgoing multicast packets. 1654 */ 1655 int optval; 1656 if (m == NULL || m->m_len != sizeof(int)) { 1657 error = EINVAL; 1658 break; 1659 } 1660 optval = *(mtod(m, u_int *)); 1661 if (optval < -1 || optval >= 256) 1662 error = EINVAL; 1663 else if (optval == -1) 1664 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1665 else 1666 im6o->im6o_multicast_hlim = optval; 1667 break; 1668 } 1669 1670 case IPV6_MULTICAST_LOOP: 1671 /* 1672 * Set the loopback flag for outgoing multicast packets. 1673 * Must be zero or one. 1674 */ 1675 if (m == NULL || m->m_len != sizeof(u_int) || 1676 (loop = *(mtod(m, u_int *))) > 1) { 1677 error = EINVAL; 1678 break; 1679 } 1680 im6o->im6o_multicast_loop = loop; 1681 break; 1682 1683 case IPV6_JOIN_GROUP: 1684 /* 1685 * Add a multicast group membership. 1686 * Group must be a valid IP6 multicast address. 1687 */ 1688 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1689 error = EINVAL; 1690 break; 1691 } 1692 mreq = mtod(m, struct ipv6_mreq *); 1693 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1694 /* 1695 * We use the unspecified address to specify to accept 1696 * all multicast addresses. Only super user is allowed 1697 * to do this. 1698 */ 1699 if (suser(p)) 1700 { 1701 error = EACCES; 1702 break; 1703 } 1704 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1705 error = EINVAL; 1706 break; 1707 } 1708 1709 /* 1710 * If the interface is specified, validate it. 1711 */ 1712 if (mreq->ipv6mr_interface < 0 1713 || if_index < mreq->ipv6mr_interface) { 1714 error = ENXIO; /* XXX EINVAL? */ 1715 break; 1716 } 1717 /* 1718 * If no interface was explicitly specified, choose an 1719 * appropriate one according to the given multicast address. 1720 */ 1721 if (mreq->ipv6mr_interface == 0) { 1722 /* 1723 * If the multicast address is in node-local scope, 1724 * the interface should be a loopback interface. 1725 * Otherwise, look up the routing table for the 1726 * address, and choose the outgoing interface. 1727 * XXX: is it a good approach? 1728 */ 1729 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1730 ifp = &loif[0]; 1731 } else { 1732 ro.ro_rt = NULL; 1733 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1734 bzero(dst, sizeof(*dst)); 1735 dst->sin6_len = sizeof(struct sockaddr_in6); 1736 dst->sin6_family = AF_INET6; 1737 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1738 rtalloc((struct route *)&ro); 1739 if (ro.ro_rt == NULL) { 1740 error = EADDRNOTAVAIL; 1741 break; 1742 } 1743 ifp = ro.ro_rt->rt_ifp; 1744 rtfree(ro.ro_rt); 1745 } 1746 } else 1747 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1748 1749 /* 1750 * See if we found an interface, and confirm that it 1751 * supports multicast 1752 */ 1753 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1754 error = EADDRNOTAVAIL; 1755 break; 1756 } 1757 /* 1758 * Put interface index into the multicast address, 1759 * if the address has link-local scope. 1760 */ 1761 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1762 mreq->ipv6mr_multiaddr.s6_addr16[1] 1763 = htons(mreq->ipv6mr_interface); 1764 } 1765 /* 1766 * See if the membership already exists. 1767 */ 1768 for (imm = im6o->im6o_memberships.lh_first; 1769 imm != NULL; imm = imm->i6mm_chain.le_next) 1770 if (imm->i6mm_maddr->in6m_ifp == ifp && 1771 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1772 &mreq->ipv6mr_multiaddr)) 1773 break; 1774 if (imm != NULL) { 1775 error = EADDRINUSE; 1776 break; 1777 } 1778 /* 1779 * Everything looks good; add a new record to the multicast 1780 * address list for the given interface. 1781 */ 1782 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1783 if (imm == NULL) { 1784 error = ENOBUFS; 1785 break; 1786 } 1787 if ((imm->i6mm_maddr = 1788 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1789 free(imm, M_IPMADDR); 1790 break; 1791 } 1792 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1793 break; 1794 1795 case IPV6_LEAVE_GROUP: 1796 /* 1797 * Drop a multicast group membership. 1798 * Group must be a valid IP6 multicast address. 1799 */ 1800 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1801 error = EINVAL; 1802 break; 1803 } 1804 mreq = mtod(m, struct ipv6_mreq *); 1805 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1806 if (suser(p)) { 1807 error = EACCES; 1808 break; 1809 } 1810 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1811 error = EINVAL; 1812 break; 1813 } 1814 /* 1815 * If an interface address was specified, get a pointer 1816 * to its ifnet structure. 1817 */ 1818 if (mreq->ipv6mr_interface < 0 1819 || if_index < mreq->ipv6mr_interface) { 1820 error = ENXIO; /* XXX EINVAL? */ 1821 break; 1822 } 1823 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1824 /* 1825 * Put interface index into the multicast address, 1826 * if the address has link-local scope. 1827 */ 1828 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1829 mreq->ipv6mr_multiaddr.s6_addr16[1] 1830 = htons(mreq->ipv6mr_interface); 1831 } 1832 /* 1833 * Find the membership in the membership list. 1834 */ 1835 for (imm = im6o->im6o_memberships.lh_first; 1836 imm != NULL; imm = imm->i6mm_chain.le_next) { 1837 if ((ifp == NULL || 1838 imm->i6mm_maddr->in6m_ifp == ifp) && 1839 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1840 &mreq->ipv6mr_multiaddr)) 1841 break; 1842 } 1843 if (imm == NULL) { 1844 /* Unable to resolve interface */ 1845 error = EADDRNOTAVAIL; 1846 break; 1847 } 1848 /* 1849 * Give up the multicast address record to which the 1850 * membership points. 1851 */ 1852 LIST_REMOVE(imm, i6mm_chain); 1853 in6_delmulti(imm->i6mm_maddr); 1854 free(imm, M_IPMADDR); 1855 break; 1856 1857 default: 1858 error = EOPNOTSUPP; 1859 break; 1860 } 1861 1862 /* 1863 * If all options have default values, no need to keep the mbuf. 1864 */ 1865 if (im6o->im6o_multicast_ifp == NULL && 1866 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1867 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1868 im6o->im6o_memberships.lh_first == NULL) { 1869 free(*im6op, M_IPMOPTS); 1870 *im6op = NULL; 1871 } 1872 1873 return(error); 1874 } 1875 1876 /* 1877 * Return the IP6 multicast options in response to user getsockopt(). 1878 */ 1879 static int 1880 ip6_getmoptions(optname, im6o, mp) 1881 int optname; 1882 register struct ip6_moptions *im6o; 1883 register struct mbuf **mp; 1884 { 1885 u_int *hlim, *loop, *ifindex; 1886 1887 *mp = m_get(M_WAIT, MT_HEADER); /*XXX*/ 1888 1889 switch (optname) { 1890 1891 case IPV6_MULTICAST_IF: 1892 ifindex = mtod(*mp, u_int *); 1893 (*mp)->m_len = sizeof(u_int); 1894 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1895 *ifindex = 0; 1896 else 1897 *ifindex = im6o->im6o_multicast_ifp->if_index; 1898 return(0); 1899 1900 case IPV6_MULTICAST_HOPS: 1901 hlim = mtod(*mp, u_int *); 1902 (*mp)->m_len = sizeof(u_int); 1903 if (im6o == NULL) 1904 *hlim = ip6_defmcasthlim; 1905 else 1906 *hlim = im6o->im6o_multicast_hlim; 1907 return(0); 1908 1909 case IPV6_MULTICAST_LOOP: 1910 loop = mtod(*mp, u_int *); 1911 (*mp)->m_len = sizeof(u_int); 1912 if (im6o == NULL) 1913 *loop = ip6_defmcasthlim; 1914 else 1915 *loop = im6o->im6o_multicast_loop; 1916 return(0); 1917 1918 default: 1919 return(EOPNOTSUPP); 1920 } 1921 } 1922 1923 /* 1924 * Discard the IP6 multicast options. 1925 */ 1926 void 1927 ip6_freemoptions(im6o) 1928 register struct ip6_moptions *im6o; 1929 { 1930 struct in6_multi_mship *imm; 1931 1932 if (im6o == NULL) 1933 return; 1934 1935 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1936 LIST_REMOVE(imm, i6mm_chain); 1937 if (imm->i6mm_maddr) 1938 in6_delmulti(imm->i6mm_maddr); 1939 free(imm, M_IPMADDR); 1940 } 1941 free(im6o, M_IPMOPTS); 1942 } 1943 1944 /* 1945 * Set IPv6 outgoing packet options based on advanced API. 1946 */ 1947 int 1948 ip6_setpktoptions(control, opt, priv) 1949 struct mbuf *control; 1950 struct ip6_pktopts *opt; 1951 int priv; 1952 { 1953 register struct cmsghdr *cm = 0; 1954 1955 if (control == 0 || opt == 0) 1956 return(EINVAL); 1957 1958 bzero(opt, sizeof(*opt)); 1959 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1960 1961 /* 1962 * XXX: Currently, we assume all the optional information is stored 1963 * in a single mbuf. 1964 */ 1965 if (control->m_next) 1966 return(EINVAL); 1967 1968 for (; control->m_len; control->m_data += ALIGN(cm->cmsg_len), 1969 control->m_len -= ALIGN(cm->cmsg_len)) { 1970 cm = mtod(control, struct cmsghdr *); 1971 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1972 return(EINVAL); 1973 if (cm->cmsg_level != IPPROTO_IPV6) 1974 continue; 1975 1976 switch(cm->cmsg_type) { 1977 case IPV6_PKTINFO: 1978 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1979 return(EINVAL); 1980 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1981 if (opt->ip6po_pktinfo->ipi6_ifindex && 1982 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1983 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1984 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1985 1986 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1987 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1988 return(ENXIO); 1989 } 1990 1991 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 1992 struct ifaddr *ia; 1993 struct sockaddr_in6 sin6; 1994 1995 bzero(&sin6, sizeof(sin6)); 1996 sin6.sin6_len = sizeof(sin6); 1997 sin6.sin6_family = AF_INET6; 1998 sin6.sin6_addr = 1999 opt->ip6po_pktinfo->ipi6_addr; 2000 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2001 if (ia == NULL || 2002 (opt->ip6po_pktinfo->ipi6_ifindex && 2003 (ia->ifa_ifp->if_index != 2004 opt->ip6po_pktinfo->ipi6_ifindex))) { 2005 return(EADDRNOTAVAIL); 2006 } 2007 /* 2008 * Check if the requested source address is 2009 * indeed a unicast address assigned to the 2010 * node. 2011 */ 2012 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2013 return(EADDRNOTAVAIL); 2014 } 2015 break; 2016 2017 case IPV6_HOPLIMIT: 2018 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2019 return(EINVAL); 2020 2021 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2022 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2023 return(EINVAL); 2024 break; 2025 2026 case IPV6_NEXTHOP: 2027 if (!priv) 2028 return(EPERM); 2029 if (cm->cmsg_len < sizeof(u_char) || 2030 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2031 return(EINVAL); 2032 2033 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2034 2035 break; 2036 2037 case IPV6_HOPOPTS: 2038 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2039 return(EINVAL); 2040 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2041 if (cm->cmsg_len != 2042 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2043 return(EINVAL); 2044 break; 2045 2046 case IPV6_DSTOPTS: 2047 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2048 return(EINVAL); 2049 2050 /* 2051 * If there is no routing header yet, the destination 2052 * options header should be put on the 1st part. 2053 * Otherwise, the header should be on the 2nd part. 2054 * (See RFC 2460, section 4.1) 2055 */ 2056 if (opt->ip6po_rthdr == NULL) { 2057 opt->ip6po_dest1 = 2058 (struct ip6_dest *)CMSG_DATA(cm); 2059 if (cm->cmsg_len != 2060 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2061 << 3)) 2062 return(EINVAL); 2063 } else { 2064 opt->ip6po_dest2 = 2065 (struct ip6_dest *)CMSG_DATA(cm); 2066 if (cm->cmsg_len != 2067 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2068 << 3)) 2069 return(EINVAL); 2070 } 2071 break; 2072 2073 case IPV6_RTHDR: 2074 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2075 return(EINVAL); 2076 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2077 if (cm->cmsg_len != 2078 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2079 return(EINVAL); 2080 switch(opt->ip6po_rthdr->ip6r_type) { 2081 case IPV6_RTHDR_TYPE_0: 2082 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2083 return(EINVAL); 2084 break; 2085 default: 2086 return(EINVAL); 2087 } 2088 break; 2089 2090 default: 2091 return(ENOPROTOOPT); 2092 } 2093 } 2094 2095 return(0); 2096 } 2097 2098 /* 2099 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2100 * packet to the input queue of a specified interface. Note that this 2101 * calls the output routine of the loopback "driver", but with an interface 2102 * pointer that might NOT be &loif -- easier than replicating that code here. 2103 */ 2104 void 2105 ip6_mloopback(ifp, m, dst) 2106 struct ifnet *ifp; 2107 register struct mbuf *m; 2108 register struct sockaddr_in6 *dst; 2109 { 2110 struct mbuf *copym; 2111 struct ip6_hdr *ip6; 2112 2113 copym = m_copy(m, 0, M_COPYALL); 2114 if (copym == NULL) 2115 return; 2116 2117 /* 2118 * Make sure to deep-copy IPv6 header portion in case the data 2119 * is in an mbuf cluster, so that we can safely override the IPv6 2120 * header portion later. 2121 */ 2122 if ((copym->m_flags & M_EXT) != 0 || 2123 copym->m_len < sizeof(struct ip6_hdr)) { 2124 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2125 if (copym == NULL) 2126 return; 2127 } 2128 2129 #ifdef DIAGNOSTIC 2130 if (copym->m_len < sizeof(*ip6)) { 2131 m_freem(copym); 2132 return; 2133 } 2134 #endif 2135 2136 #ifndef FAKE_LOOPBACK_IF 2137 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 2138 #else 2139 if (1) 2140 #endif 2141 { 2142 ip6 = mtod(copym, struct ip6_hdr *); 2143 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2144 ip6->ip6_src.s6_addr16[1] = 0; 2145 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2146 ip6->ip6_dst.s6_addr16[1] = 0; 2147 } 2148 2149 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2150 } 2151 2152 /* 2153 * Chop IPv6 header off from the payload. 2154 */ 2155 static int 2156 ip6_splithdr(m, exthdrs) 2157 struct mbuf *m; 2158 struct ip6_exthdrs *exthdrs; 2159 { 2160 struct mbuf *mh; 2161 struct ip6_hdr *ip6; 2162 2163 ip6 = mtod(m, struct ip6_hdr *); 2164 if (m->m_len > sizeof(*ip6)) { 2165 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2166 if (mh == 0) { 2167 m_freem(m); 2168 return ENOBUFS; 2169 } 2170 M_COPY_PKTHDR(mh, m); 2171 MH_ALIGN(mh, sizeof(*ip6)); 2172 m->m_flags &= ~M_PKTHDR; 2173 m->m_len -= sizeof(*ip6); 2174 m->m_data += sizeof(*ip6); 2175 mh->m_next = m; 2176 m = mh; 2177 m->m_len = sizeof(*ip6); 2178 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2179 } 2180 exthdrs->ip6e_ip6 = m; 2181 return 0; 2182 } 2183 2184 /* 2185 * Compute IPv6 extension header length. 2186 */ 2187 int 2188 ip6_optlen(in6p) 2189 struct in6pcb *in6p; 2190 { 2191 int len; 2192 2193 if (!in6p->in6p_outputopts) 2194 return 0; 2195 2196 len = 0; 2197 #define elen(x) \ 2198 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2199 2200 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2201 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2202 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2203 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2204 return len; 2205 #undef elen 2206 } 2207 2208