ip6_output.c revision 1.31.2.3
1 /* $NetBSD: ip6_output.c,v 1.31.2.3 2001/04/09 01:58:41 nathanw Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include "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/lwp.h> 81 #include <sys/proc.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #ifdef PFIL_HOOKS 86 #include <net/pfil.h> 87 #endif 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet6/in6_pcb.h> 95 #include <netinet6/nd6.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #include <netkey/key.h> 100 #endif /* IPSEC */ 101 102 #include "loop.h" 103 104 #include <net/net_osdep.h> 105 106 #ifdef IPV6FIREWALL 107 #include <netinet6/ip6_fw.h> 108 #endif 109 110 #ifdef PFIL_HOOKS 111 extern struct pfil_head inet6_pfil_hook; /* XXX */ 112 #endif 113 114 struct ip6_exthdrs { 115 struct mbuf *ip6e_ip6; 116 struct mbuf *ip6e_hbh; 117 struct mbuf *ip6e_dest1; 118 struct mbuf *ip6e_rthdr; 119 struct mbuf *ip6e_dest2; 120 }; 121 122 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 123 struct socket *)); 124 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 125 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 126 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 127 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 128 struct ip6_frag **)); 129 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 130 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 131 132 extern struct ifnet loif[NLOOP]; 133 134 /* 135 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 136 * header (with pri, len, nxt, hlim, src, dst). 137 * This function may modify ver and hlim only. 138 * The mbuf chain containing the packet will be freed. 139 * The mbuf opt, if present, will not be freed. 140 */ 141 int 142 ip6_output(m0, opt, ro, flags, im6o, ifpp) 143 struct mbuf *m0; 144 struct ip6_pktopts *opt; 145 struct route_in6 *ro; 146 int flags; 147 struct ip6_moptions *im6o; 148 struct ifnet **ifpp; /* XXX: just for statistics */ 149 { 150 struct ip6_hdr *ip6, *mhip6; 151 struct ifnet *ifp, *origifp; 152 struct mbuf *m = m0; 153 int hlen, tlen, len, off; 154 struct route_in6 ip6route; 155 struct sockaddr_in6 *dst; 156 int error = 0; 157 struct in6_ifaddr *ia; 158 u_long mtu; 159 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 160 struct ip6_exthdrs exthdrs; 161 struct in6_addr finaldst; 162 struct route_in6 *ro_pmtu = NULL; 163 int hdrsplit = 0; 164 int needipsec = 0; 165 #ifdef IPSEC 166 int needipsectun = 0; 167 struct socket *so; 168 struct secpolicy *sp = NULL; 169 170 /* for AH processing. stupid to have "socket" variable in IP layer... */ 171 so = ipsec_getsocket(m); 172 (void)ipsec_setsocket(m, NULL); 173 ip6 = mtod(m, struct ip6_hdr *); 174 #endif /* IPSEC */ 175 176 #define MAKE_EXTHDR(hp, mp) \ 177 do { \ 178 if (hp) { \ 179 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 180 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 181 ((eh)->ip6e_len + 1) << 3); \ 182 if (error) \ 183 goto freehdrs; \ 184 } \ 185 } while (0) 186 187 bzero(&exthdrs, sizeof(exthdrs)); 188 if (opt) { 189 /* Hop-by-Hop options header */ 190 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 191 /* Destination options header(1st part) */ 192 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 193 /* Routing header */ 194 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 195 /* Destination options header(2nd part) */ 196 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 197 } 198 199 #ifdef IPSEC 200 /* get a security policy for this packet */ 201 if (so == NULL) 202 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 203 else 204 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 205 206 if (sp == NULL) { 207 ipsec6stat.out_inval++; 208 goto freehdrs; 209 } 210 211 error = 0; 212 213 /* check policy */ 214 switch (sp->policy) { 215 case IPSEC_POLICY_DISCARD: 216 /* 217 * This packet is just discarded. 218 */ 219 ipsec6stat.out_polvio++; 220 goto freehdrs; 221 222 case IPSEC_POLICY_BYPASS: 223 case IPSEC_POLICY_NONE: 224 /* no need to do IPsec. */ 225 needipsec = 0; 226 break; 227 228 case IPSEC_POLICY_IPSEC: 229 if (sp->req == NULL) { 230 /* XXX should be panic ? */ 231 printf("ip6_output: No IPsec request specified.\n"); 232 error = EINVAL; 233 goto freehdrs; 234 } 235 needipsec = 1; 236 break; 237 238 case IPSEC_POLICY_ENTRUST: 239 default: 240 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 241 } 242 #endif /* IPSEC */ 243 244 /* 245 * Calculate the total length of the extension header chain. 246 * Keep the length of the unfragmentable part for fragmentation. 247 */ 248 optlen = 0; 249 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 250 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 251 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 252 unfragpartlen = optlen + sizeof(struct ip6_hdr); 253 /* NOTE: we don't add AH/ESP length here. do that later. */ 254 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 255 256 /* 257 * If we need IPsec, or there is at least one extension header, 258 * separate IP6 header from the payload. 259 */ 260 if ((needipsec || optlen) && !hdrsplit) { 261 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 262 m = NULL; 263 goto freehdrs; 264 } 265 m = exthdrs.ip6e_ip6; 266 hdrsplit++; 267 } 268 269 /* adjust pointer */ 270 ip6 = mtod(m, struct ip6_hdr *); 271 272 /* adjust mbuf packet header length */ 273 m->m_pkthdr.len += optlen; 274 plen = m->m_pkthdr.len - sizeof(*ip6); 275 276 /* If this is a jumbo payload, insert a jumbo payload option. */ 277 if (plen > IPV6_MAXPACKET) { 278 if (!hdrsplit) { 279 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 280 m = NULL; 281 goto freehdrs; 282 } 283 m = exthdrs.ip6e_ip6; 284 hdrsplit++; 285 } 286 /* adjust pointer */ 287 ip6 = mtod(m, struct ip6_hdr *); 288 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 289 goto freehdrs; 290 ip6->ip6_plen = 0; 291 } else 292 ip6->ip6_plen = htons(plen); 293 294 /* 295 * Concatenate headers and fill in next header fields. 296 * Here we have, on "m" 297 * IPv6 payload 298 * and we insert headers accordingly. Finally, we should be getting: 299 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 300 * 301 * during the header composing process, "m" points to IPv6 header. 302 * "mprev" points to an extension header prior to esp. 303 */ 304 { 305 u_char *nexthdrp = &ip6->ip6_nxt; 306 struct mbuf *mprev = m; 307 308 /* 309 * we treat dest2 specially. this makes IPsec processing 310 * much easier. 311 * 312 * result: IPv6 dest2 payload 313 * m and mprev will point to IPv6 header. 314 */ 315 if (exthdrs.ip6e_dest2) { 316 if (!hdrsplit) 317 panic("assumption failed: hdr not split"); 318 exthdrs.ip6e_dest2->m_next = m->m_next; 319 m->m_next = exthdrs.ip6e_dest2; 320 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 321 ip6->ip6_nxt = IPPROTO_DSTOPTS; 322 } 323 324 #define MAKE_CHAIN(m, mp, p, i)\ 325 do {\ 326 if (m) {\ 327 if (!hdrsplit) \ 328 panic("assumption failed: hdr not split"); \ 329 *mtod((m), u_char *) = *(p);\ 330 *(p) = (i);\ 331 p = mtod((m), u_char *);\ 332 (m)->m_next = (mp)->m_next;\ 333 (mp)->m_next = (m);\ 334 (mp) = (m);\ 335 }\ 336 } while (0) 337 /* 338 * result: IPv6 hbh dest1 rthdr dest2 payload 339 * m will point to IPv6 header. mprev will point to the 340 * extension header prior to dest2 (rthdr in the above case). 341 */ 342 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 343 nexthdrp, IPPROTO_HOPOPTS); 344 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 345 nexthdrp, IPPROTO_DSTOPTS); 346 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 347 nexthdrp, IPPROTO_ROUTING); 348 349 #ifdef IPSEC 350 if (!needipsec) 351 goto skip_ipsec2; 352 353 /* 354 * pointers after IPsec headers are not valid any more. 355 * other pointers need a great care too. 356 * (IPsec routines should not mangle mbufs prior to AH/ESP) 357 */ 358 exthdrs.ip6e_dest2 = NULL; 359 360 { 361 struct ip6_rthdr *rh = NULL; 362 int segleft_org = 0; 363 struct ipsec_output_state state; 364 365 if (exthdrs.ip6e_rthdr) { 366 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 367 segleft_org = rh->ip6r_segleft; 368 rh->ip6r_segleft = 0; 369 } 370 371 bzero(&state, sizeof(state)); 372 state.m = m; 373 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 374 &needipsectun); 375 m = state.m; 376 if (error) { 377 /* mbuf is already reclaimed in ipsec6_output_trans. */ 378 m = NULL; 379 switch (error) { 380 case EHOSTUNREACH: 381 case ENETUNREACH: 382 case EMSGSIZE: 383 case ENOBUFS: 384 case ENOMEM: 385 break; 386 default: 387 printf("ip6_output (ipsec): error code %d\n", error); 388 /*fall through*/ 389 case ENOENT: 390 /* don't show these error codes to the user */ 391 error = 0; 392 break; 393 } 394 goto bad; 395 } 396 if (exthdrs.ip6e_rthdr) { 397 /* ah6_output doesn't modify mbuf chain */ 398 rh->ip6r_segleft = segleft_org; 399 } 400 } 401 skip_ipsec2:; 402 #endif 403 } 404 405 /* 406 * If there is a routing header, replace destination address field 407 * with the first hop of the routing header. 408 */ 409 if (exthdrs.ip6e_rthdr) { 410 struct ip6_rthdr *rh = 411 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 412 struct ip6_rthdr *)); 413 struct ip6_rthdr0 *rh0; 414 415 finaldst = ip6->ip6_dst; 416 switch (rh->ip6r_type) { 417 case IPV6_RTHDR_TYPE_0: 418 rh0 = (struct ip6_rthdr0 *)rh; 419 ip6->ip6_dst = rh0->ip6r0_addr[0]; 420 bcopy((caddr_t)&rh0->ip6r0_addr[1], 421 (caddr_t)&rh0->ip6r0_addr[0], 422 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1) 423 ); 424 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 425 break; 426 default: /* is it possible? */ 427 error = EINVAL; 428 goto bad; 429 } 430 } 431 432 /* Source address validation */ 433 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 434 (flags & IPV6_DADOUTPUT) == 0) { 435 error = EOPNOTSUPP; 436 ip6stat.ip6s_badscope++; 437 goto bad; 438 } 439 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 440 error = EOPNOTSUPP; 441 ip6stat.ip6s_badscope++; 442 goto bad; 443 } 444 445 ip6stat.ip6s_localout++; 446 447 /* 448 * Route packet. 449 */ 450 if (ro == 0) { 451 ro = &ip6route; 452 bzero((caddr_t)ro, sizeof(*ro)); 453 } 454 ro_pmtu = ro; 455 if (opt && opt->ip6po_rthdr) 456 ro = &opt->ip6po_route; 457 dst = (struct sockaddr_in6 *)&ro->ro_dst; 458 /* 459 * If there is a cached route, 460 * check that it is to the same destination 461 * and is still up. If not, free it and try again. 462 */ 463 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 464 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 465 RTFREE(ro->ro_rt); 466 ro->ro_rt = (struct rtentry *)0; 467 } 468 if (ro->ro_rt == 0) { 469 bzero(dst, sizeof(*dst)); 470 dst->sin6_family = AF_INET6; 471 dst->sin6_len = sizeof(struct sockaddr_in6); 472 dst->sin6_addr = ip6->ip6_dst; 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, 0 636 ); 637 } 638 if (ro->ro_rt == 0) { 639 ip6stat.ip6s_noroute++; 640 error = EHOSTUNREACH; 641 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 642 goto bad; 643 } 644 ia = ifatoia6(ro->ro_rt->rt_ifa); 645 ifp = ro->ro_rt->rt_ifp; 646 ro->ro_rt->rt_use++; 647 } 648 649 if ((flags & IPV6_FORWARDING) == 0) 650 in6_ifstat_inc(ifp, ifs6_out_request); 651 in6_ifstat_inc(ifp, ifs6_out_mcast); 652 653 /* 654 * Confirm that the outgoing interface supports multicast. 655 */ 656 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 657 ip6stat.ip6s_noroute++; 658 in6_ifstat_inc(ifp, ifs6_out_discard); 659 error = ENETUNREACH; 660 goto bad; 661 } 662 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 663 if (in6m != NULL && 664 (im6o == NULL || im6o->im6o_multicast_loop)) { 665 /* 666 * If we belong to the destination multicast group 667 * on the outgoing interface, and the caller did not 668 * forbid loopback, loop back a copy. 669 */ 670 ip6_mloopback(ifp, m, dst); 671 } else { 672 /* 673 * If we are acting as a multicast router, perform 674 * multicast forwarding as if the packet had just 675 * arrived on the interface to which we are about 676 * to send. The multicast forwarding function 677 * recursively calls this function, using the 678 * IPV6_FORWARDING flag to prevent infinite recursion. 679 * 680 * Multicasts that are looped back by ip6_mloopback(), 681 * above, will be forwarded by the ip6_input() routine, 682 * if necessary. 683 */ 684 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 685 if (ip6_mforward(ip6, ifp, m) != 0) { 686 m_freem(m); 687 goto done; 688 } 689 } 690 } 691 /* 692 * Multicasts with a hoplimit of zero may be looped back, 693 * above, but must not be transmitted on a network. 694 * Also, multicasts addressed to the loopback interface 695 * are not sent -- the above call to ip6_mloopback() will 696 * loop back a copy if this host actually belongs to the 697 * destination group on the loopback interface. 698 */ 699 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 700 m_freem(m); 701 goto done; 702 } 703 } 704 705 /* 706 * Fill the outgoing inteface to tell the upper layer 707 * to increment per-interface statistics. 708 */ 709 if (ifpp) 710 *ifpp = ifp; 711 712 /* 713 * Determine path MTU. 714 */ 715 if (ro_pmtu != ro) { 716 /* The first hop and the final destination may differ. */ 717 struct sockaddr_in6 *sin6_fin = 718 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 719 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 720 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 721 &finaldst))) { 722 RTFREE(ro_pmtu->ro_rt); 723 ro_pmtu->ro_rt = (struct rtentry *)0; 724 } 725 if (ro_pmtu->ro_rt == 0) { 726 bzero(sin6_fin, sizeof(*sin6_fin)); 727 sin6_fin->sin6_family = AF_INET6; 728 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 729 sin6_fin->sin6_addr = finaldst; 730 731 rtalloc((struct route *)ro_pmtu); 732 } 733 } 734 if (ro_pmtu->ro_rt != NULL) { 735 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 736 737 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 738 if (mtu > ifmtu || mtu == 0) { 739 /* 740 * The MTU on the route is larger than the MTU on 741 * the interface! This shouldn't happen, unless the 742 * MTU of the interface has been changed after the 743 * interface was brought up. Change the MTU in the 744 * route to match the interface MTU (as long as the 745 * field isn't locked). 746 * 747 * if MTU on the route is 0, we need to fix the MTU. 748 * this case happens with path MTU discovery timeouts. 749 */ 750 mtu = ifmtu; 751 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 752 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 753 } 754 } else { 755 mtu = nd_ifinfo[ifp->if_index].linkmtu; 756 } 757 758 /* Fake scoped addresses */ 759 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 760 /* 761 * If source or destination address is a scoped address, and 762 * the packet is going to be sent to a loopback interface, 763 * we should keep the original interface. 764 */ 765 766 /* 767 * XXX: this is a very experimental and temporary solution. 768 * We eventually have sockaddr_in6 and use the sin6_scope_id 769 * field of the structure here. 770 * We rely on the consistency between two scope zone ids 771 * of source add destination, which should already be assured 772 * Larger scopes than link will be supported in the near 773 * future. 774 */ 775 origifp = NULL; 776 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 777 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 778 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 779 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 780 /* 781 * XXX: origifp can be NULL even in those two cases above. 782 * For example, if we remove the (only) link-local address 783 * from the loopback interface, and try to send a link-local 784 * address without link-id information. Then the source 785 * address is ::1, and the destination address is the 786 * link-local address with its s6_addr16[1] being zero. 787 * What is worse, if the packet goes to the loopback interface 788 * by a default rejected route, the null pointer would be 789 * passed to looutput, and the kernel would hang. 790 * The following last resort would prevent such disaster. 791 */ 792 if (origifp == NULL) 793 origifp = ifp; 794 } 795 else 796 origifp = ifp; 797 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 798 ip6->ip6_src.s6_addr16[1] = 0; 799 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 800 ip6->ip6_dst.s6_addr16[1] = 0; 801 802 /* 803 * If the outgoing packet contains a hop-by-hop options header, 804 * it must be examined and processed even by the source node. 805 * (RFC 2460, section 4.) 806 */ 807 if (exthdrs.ip6e_hbh) { 808 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 809 u_int32_t dummy1; /* XXX unused */ 810 u_int32_t dummy2; /* XXX unused */ 811 812 /* 813 * XXX: if we have to send an ICMPv6 error to the sender, 814 * we need the M_LOOP flag since icmp6_error() expects 815 * the IPv6 and the hop-by-hop options header are 816 * continuous unless the flag is set. 817 */ 818 m->m_flags |= M_LOOP; 819 m->m_pkthdr.rcvif = ifp; 820 if (ip6_process_hopopts(m, 821 (u_int8_t *)(hbh + 1), 822 ((hbh->ip6h_len + 1) << 3) - 823 sizeof(struct ip6_hbh), 824 &dummy1, &dummy2) < 0) { 825 /* m was already freed at this point */ 826 error = EINVAL;/* better error? */ 827 goto done; 828 } 829 m->m_flags &= ~M_LOOP; /* XXX */ 830 m->m_pkthdr.rcvif = NULL; 831 } 832 833 #ifdef PFIL_HOOKS 834 /* 835 * Run through list of hooks for output packets. 836 */ 837 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, 838 PFIL_OUT)) != 0) 839 goto done; 840 if (m == NULL) 841 goto done; 842 ip6 = mtod(m, struct ip6_hdr *); 843 #endif /* PFIL_HOOKS */ 844 /* 845 * Send the packet to the outgoing interface. 846 * If necessary, do IPv6 fragmentation before sending. 847 */ 848 tlen = m->m_pkthdr.len; 849 if (tlen <= mtu 850 #ifdef notyet 851 /* 852 * On any link that cannot convey a 1280-octet packet in one piece, 853 * link-specific fragmentation and reassembly must be provided at 854 * a layer below IPv6. [RFC 2460, sec.5] 855 * Thus if the interface has ability of link-level fragmentation, 856 * we can just send the packet even if the packet size is 857 * larger than the link's MTU. 858 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 859 */ 860 861 || ifp->if_flags & IFF_FRAGMENTABLE 862 #endif 863 ) 864 { 865 #ifdef IFA_STATS 866 struct in6_ifaddr *ia6; 867 ip6 = mtod(m, struct ip6_hdr *); 868 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 869 if (ia6) { 870 ia6->ia_ifa.ifa_data.ifad_outbytes += 871 m->m_pkthdr.len; 872 } 873 #endif 874 #ifdef IPSEC 875 /* clean ipsec history once it goes out of the node */ 876 ipsec_delaux(m); 877 #endif 878 #ifdef OLDIP6OUTPUT 879 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 880 ro->ro_rt); 881 #else 882 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 883 #endif 884 goto done; 885 } else if (mtu < IPV6_MMTU) { 886 /* 887 * note that path MTU is never less than IPV6_MMTU 888 * (see icmp6_input). 889 */ 890 error = EMSGSIZE; 891 in6_ifstat_inc(ifp, ifs6_out_fragfail); 892 goto bad; 893 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 894 error = EMSGSIZE; 895 in6_ifstat_inc(ifp, ifs6_out_fragfail); 896 goto bad; 897 } else { 898 struct mbuf **mnext, *m_frgpart; 899 struct ip6_frag *ip6f; 900 u_int32_t id = htonl(ip6_id++); 901 u_char nextproto; 902 903 /* 904 * Too large for the destination or interface; 905 * fragment if possible. 906 * Must be able to put at least 8 bytes per fragment. 907 */ 908 hlen = unfragpartlen; 909 if (mtu > IPV6_MAXPACKET) 910 mtu = IPV6_MAXPACKET; 911 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 912 if (len < 8) { 913 error = EMSGSIZE; 914 in6_ifstat_inc(ifp, ifs6_out_fragfail); 915 goto bad; 916 } 917 918 mnext = &m->m_nextpkt; 919 920 /* 921 * Change the next header field of the last header in the 922 * unfragmentable part. 923 */ 924 if (exthdrs.ip6e_rthdr) { 925 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 926 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 927 } else if (exthdrs.ip6e_dest1) { 928 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 929 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 930 } else if (exthdrs.ip6e_hbh) { 931 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 932 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 933 } else { 934 nextproto = ip6->ip6_nxt; 935 ip6->ip6_nxt = IPPROTO_FRAGMENT; 936 } 937 938 /* 939 * Loop through length of segment after first fragment, 940 * make new header and copy data of each part and link onto chain. 941 */ 942 m0 = m; 943 for (off = hlen; off < tlen; off += len) { 944 MGETHDR(m, M_DONTWAIT, MT_HEADER); 945 if (!m) { 946 error = ENOBUFS; 947 ip6stat.ip6s_odropped++; 948 goto sendorfree; 949 } 950 m->m_flags = m0->m_flags & M_COPYFLAGS; 951 *mnext = m; 952 mnext = &m->m_nextpkt; 953 m->m_data += max_linkhdr; 954 mhip6 = mtod(m, struct ip6_hdr *); 955 *mhip6 = *ip6; 956 m->m_len = sizeof(*mhip6); 957 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 958 if (error) { 959 ip6stat.ip6s_odropped++; 960 goto sendorfree; 961 } 962 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 963 if (off + len >= tlen) 964 len = tlen - off; 965 else 966 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 967 mhip6->ip6_plen = htons((u_short)(len + hlen + 968 sizeof(*ip6f) - 969 sizeof(struct ip6_hdr))); 970 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 971 error = ENOBUFS; 972 ip6stat.ip6s_odropped++; 973 goto sendorfree; 974 } 975 m_cat(m, m_frgpart); 976 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 977 m->m_pkthdr.rcvif = (struct ifnet *)0; 978 ip6f->ip6f_reserved = 0; 979 ip6f->ip6f_ident = id; 980 ip6f->ip6f_nxt = nextproto; 981 ip6stat.ip6s_ofragments++; 982 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 983 } 984 985 in6_ifstat_inc(ifp, ifs6_out_fragok); 986 } 987 988 /* 989 * Remove leading garbages. 990 */ 991 sendorfree: 992 m = m0->m_nextpkt; 993 m0->m_nextpkt = 0; 994 m_freem(m0); 995 for (m0 = m; m; m = m0) { 996 m0 = m->m_nextpkt; 997 m->m_nextpkt = 0; 998 if (error == 0) { 999 #ifdef IFA_STATS 1000 struct in6_ifaddr *ia6; 1001 ip6 = mtod(m, struct ip6_hdr *); 1002 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1003 if (ia6) { 1004 ia6->ia_ifa.ifa_data.ifad_outbytes += 1005 m->m_pkthdr.len; 1006 } 1007 #endif 1008 #ifdef IPSEC 1009 /* clean ipsec history once it goes out of the node */ 1010 ipsec_delaux(m); 1011 #endif 1012 #ifdef OLDIP6OUTPUT 1013 error = (*ifp->if_output)(ifp, m, 1014 (struct sockaddr *)dst, 1015 ro->ro_rt); 1016 #else 1017 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1018 #endif 1019 } else 1020 m_freem(m); 1021 } 1022 1023 if (error == 0) 1024 ip6stat.ip6s_fragmented++; 1025 1026 done: 1027 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1028 RTFREE(ro->ro_rt); 1029 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1030 RTFREE(ro_pmtu->ro_rt); 1031 } 1032 1033 #ifdef IPSEC 1034 if (sp != NULL) 1035 key_freesp(sp); 1036 #endif /* IPSEC */ 1037 1038 return(error); 1039 1040 freehdrs: 1041 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1042 m_freem(exthdrs.ip6e_dest1); 1043 m_freem(exthdrs.ip6e_rthdr); 1044 m_freem(exthdrs.ip6e_dest2); 1045 /* fall through */ 1046 bad: 1047 m_freem(m); 1048 goto done; 1049 } 1050 1051 static int 1052 ip6_copyexthdr(mp, hdr, hlen) 1053 struct mbuf **mp; 1054 caddr_t hdr; 1055 int hlen; 1056 { 1057 struct mbuf *m; 1058 1059 if (hlen > MCLBYTES) 1060 return(ENOBUFS); /* XXX */ 1061 1062 MGET(m, M_DONTWAIT, MT_DATA); 1063 if (!m) 1064 return(ENOBUFS); 1065 1066 if (hlen > MLEN) { 1067 MCLGET(m, M_DONTWAIT); 1068 if ((m->m_flags & M_EXT) == 0) { 1069 m_free(m); 1070 return(ENOBUFS); 1071 } 1072 } 1073 m->m_len = hlen; 1074 if (hdr) 1075 bcopy(hdr, mtod(m, caddr_t), hlen); 1076 1077 *mp = m; 1078 return(0); 1079 } 1080 1081 /* 1082 * Insert jumbo payload option. 1083 */ 1084 static int 1085 ip6_insert_jumboopt(exthdrs, plen) 1086 struct ip6_exthdrs *exthdrs; 1087 u_int32_t plen; 1088 { 1089 struct mbuf *mopt; 1090 u_char *optbuf; 1091 u_int32_t v; 1092 1093 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1094 1095 /* 1096 * If there is no hop-by-hop options header, allocate new one. 1097 * If there is one but it doesn't have enough space to store the 1098 * jumbo payload option, allocate a cluster to store the whole options. 1099 * Otherwise, use it to store the options. 1100 */ 1101 if (exthdrs->ip6e_hbh == 0) { 1102 MGET(mopt, M_DONTWAIT, MT_DATA); 1103 if (mopt == 0) 1104 return(ENOBUFS); 1105 mopt->m_len = JUMBOOPTLEN; 1106 optbuf = mtod(mopt, u_char *); 1107 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1108 exthdrs->ip6e_hbh = mopt; 1109 } else { 1110 struct ip6_hbh *hbh; 1111 1112 mopt = exthdrs->ip6e_hbh; 1113 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1114 /* 1115 * XXX assumption: 1116 * - exthdrs->ip6e_hbh is not referenced from places 1117 * other than exthdrs. 1118 * - exthdrs->ip6e_hbh is not an mbuf chain. 1119 */ 1120 int oldoptlen = mopt->m_len; 1121 struct mbuf *n; 1122 1123 /* 1124 * XXX: give up if the whole (new) hbh header does 1125 * not fit even in an mbuf cluster. 1126 */ 1127 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1128 return(ENOBUFS); 1129 1130 /* 1131 * As a consequence, we must always prepare a cluster 1132 * at this point. 1133 */ 1134 MGET(n, M_DONTWAIT, MT_DATA); 1135 if (n) { 1136 MCLGET(n, M_DONTWAIT); 1137 if ((n->m_flags & M_EXT) == 0) { 1138 m_freem(n); 1139 n = NULL; 1140 } 1141 } 1142 if (!n) 1143 return(ENOBUFS); 1144 n->m_len = oldoptlen + JUMBOOPTLEN; 1145 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1146 oldoptlen); 1147 optbuf = mtod(n, caddr_t) + oldoptlen; 1148 m_freem(mopt); 1149 mopt = exthdrs->ip6e_hbh = n; 1150 } else { 1151 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1152 mopt->m_len += JUMBOOPTLEN; 1153 } 1154 optbuf[0] = IP6OPT_PADN; 1155 optbuf[1] = 1; 1156 1157 /* 1158 * Adjust the header length according to the pad and 1159 * the jumbo payload option. 1160 */ 1161 hbh = mtod(mopt, struct ip6_hbh *); 1162 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1163 } 1164 1165 /* fill in the option. */ 1166 optbuf[2] = IP6OPT_JUMBO; 1167 optbuf[3] = 4; 1168 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1169 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1170 1171 /* finally, adjust the packet header length */ 1172 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1173 1174 return(0); 1175 #undef JUMBOOPTLEN 1176 } 1177 1178 /* 1179 * Insert fragment header and copy unfragmentable header portions. 1180 */ 1181 static int 1182 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1183 struct mbuf *m0, *m; 1184 int hlen; 1185 struct ip6_frag **frghdrp; 1186 { 1187 struct mbuf *n, *mlast; 1188 1189 if (hlen > sizeof(struct ip6_hdr)) { 1190 n = m_copym(m0, sizeof(struct ip6_hdr), 1191 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1192 if (n == 0) 1193 return(ENOBUFS); 1194 m->m_next = n; 1195 } else 1196 n = m; 1197 1198 /* Search for the last mbuf of unfragmentable part. */ 1199 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1200 ; 1201 1202 if ((mlast->m_flags & M_EXT) == 0 && 1203 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1204 /* use the trailing space of the last mbuf for the fragment hdr */ 1205 *frghdrp = 1206 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1207 mlast->m_len += sizeof(struct ip6_frag); 1208 m->m_pkthdr.len += sizeof(struct ip6_frag); 1209 } else { 1210 /* allocate a new mbuf for the fragment header */ 1211 struct mbuf *mfrg; 1212 1213 MGET(mfrg, M_DONTWAIT, MT_DATA); 1214 if (mfrg == 0) 1215 return(ENOBUFS); 1216 mfrg->m_len = sizeof(struct ip6_frag); 1217 *frghdrp = mtod(mfrg, struct ip6_frag *); 1218 mlast->m_next = mfrg; 1219 } 1220 1221 return(0); 1222 } 1223 1224 /* 1225 * IP6 socket option processing. 1226 */ 1227 int 1228 ip6_ctloutput(op, so, level, optname, mp) 1229 int op; 1230 struct socket *so; 1231 int level, optname; 1232 struct mbuf **mp; 1233 { 1234 struct in6pcb *in6p = sotoin6pcb(so); 1235 struct mbuf *m = *mp; 1236 int optval = 0; 1237 int error = 0; 1238 struct proc *p = (curproc ? curproc->l_proc : 0); /* XXX */ 1239 1240 if (level == IPPROTO_IPV6) { 1241 switch (op) { 1242 1243 case PRCO_SETOPT: 1244 switch (optname) { 1245 case IPV6_PKTOPTIONS: 1246 /* m is freed in ip6_pcbopts */ 1247 return(ip6_pcbopts(&in6p->in6p_outputopts, 1248 m, so)); 1249 case IPV6_HOPOPTS: 1250 case IPV6_DSTOPTS: 1251 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1252 error = EPERM; 1253 break; 1254 } 1255 /* fall through */ 1256 case IPV6_UNICAST_HOPS: 1257 case IPV6_RECVOPTS: 1258 case IPV6_RECVRETOPTS: 1259 case IPV6_RECVDSTADDR: 1260 case IPV6_PKTINFO: 1261 case IPV6_HOPLIMIT: 1262 case IPV6_RTHDR: 1263 case IPV6_CHECKSUM: 1264 case IPV6_FAITH: 1265 #ifndef INET6_BINDV6ONLY 1266 case IPV6_BINDV6ONLY: 1267 #endif 1268 if (!m || m->m_len != sizeof(int)) 1269 error = EINVAL; 1270 else { 1271 optval = *mtod(m, int *); 1272 switch (optname) { 1273 1274 case IPV6_UNICAST_HOPS: 1275 if (optval < -1 || optval >= 256) 1276 error = EINVAL; 1277 else { 1278 /* -1 = kernel default */ 1279 in6p->in6p_hops = optval; 1280 } 1281 break; 1282 #define OPTSET(bit) \ 1283 if (optval) \ 1284 in6p->in6p_flags |= bit; \ 1285 else \ 1286 in6p->in6p_flags &= ~bit; 1287 1288 case IPV6_RECVOPTS: 1289 OPTSET(IN6P_RECVOPTS); 1290 break; 1291 1292 case IPV6_RECVRETOPTS: 1293 OPTSET(IN6P_RECVRETOPTS); 1294 break; 1295 1296 case IPV6_RECVDSTADDR: 1297 OPTSET(IN6P_RECVDSTADDR); 1298 break; 1299 1300 case IPV6_PKTINFO: 1301 OPTSET(IN6P_PKTINFO); 1302 break; 1303 1304 case IPV6_HOPLIMIT: 1305 OPTSET(IN6P_HOPLIMIT); 1306 break; 1307 1308 case IPV6_HOPOPTS: 1309 OPTSET(IN6P_HOPOPTS); 1310 break; 1311 1312 case IPV6_DSTOPTS: 1313 OPTSET(IN6P_DSTOPTS); 1314 break; 1315 1316 case IPV6_RTHDR: 1317 OPTSET(IN6P_RTHDR); 1318 break; 1319 1320 case IPV6_CHECKSUM: 1321 in6p->in6p_cksum = optval; 1322 break; 1323 1324 case IPV6_FAITH: 1325 OPTSET(IN6P_FAITH); 1326 break; 1327 1328 #ifndef INET6_BINDV6ONLY 1329 case IPV6_BINDV6ONLY: 1330 OPTSET(IN6P_BINDV6ONLY); 1331 break; 1332 #endif 1333 } 1334 } 1335 break; 1336 #undef OPTSET 1337 1338 case IPV6_MULTICAST_IF: 1339 case IPV6_MULTICAST_HOPS: 1340 case IPV6_MULTICAST_LOOP: 1341 case IPV6_JOIN_GROUP: 1342 case IPV6_LEAVE_GROUP: 1343 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1344 break; 1345 1346 case IPV6_PORTRANGE: 1347 optval = *mtod(m, int *); 1348 1349 switch (optval) { 1350 case IPV6_PORTRANGE_DEFAULT: 1351 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1352 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1353 break; 1354 1355 case IPV6_PORTRANGE_HIGH: 1356 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1357 in6p->in6p_flags |= IN6P_HIGHPORT; 1358 break; 1359 1360 case IPV6_PORTRANGE_LOW: 1361 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1362 in6p->in6p_flags |= IN6P_LOWPORT; 1363 break; 1364 1365 default: 1366 error = EINVAL; 1367 break; 1368 } 1369 break; 1370 1371 #ifdef IPSEC 1372 case IPV6_IPSEC_POLICY: 1373 { 1374 caddr_t req = NULL; 1375 size_t len = 0; 1376 1377 int priv = 0; 1378 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1379 priv = 0; 1380 else 1381 priv = 1; 1382 if (m) { 1383 req = mtod(m, caddr_t); 1384 len = m->m_len; 1385 } 1386 error = ipsec6_set_policy(in6p, 1387 optname, req, len, priv); 1388 } 1389 break; 1390 #endif /* IPSEC */ 1391 1392 default: 1393 error = ENOPROTOOPT; 1394 break; 1395 } 1396 if (m) 1397 (void)m_free(m); 1398 break; 1399 1400 case PRCO_GETOPT: 1401 switch (optname) { 1402 1403 case IPV6_OPTIONS: 1404 case IPV6_RETOPTS: 1405 #if 0 1406 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1407 if (in6p->in6p_options) { 1408 m->m_len = in6p->in6p_options->m_len; 1409 bcopy(mtod(in6p->in6p_options, caddr_t), 1410 mtod(m, caddr_t), 1411 (unsigned)m->m_len); 1412 } else 1413 m->m_len = 0; 1414 break; 1415 #else 1416 error = ENOPROTOOPT; 1417 break; 1418 #endif 1419 1420 case IPV6_PKTOPTIONS: 1421 if (in6p->in6p_options) { 1422 *mp = m_copym(in6p->in6p_options, 0, 1423 M_COPYALL, M_WAIT); 1424 } else { 1425 *mp = m_get(M_WAIT, MT_SOOPTS); 1426 (*mp)->m_len = 0; 1427 } 1428 break; 1429 1430 case IPV6_HOPOPTS: 1431 case IPV6_DSTOPTS: 1432 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1433 error = EPERM; 1434 break; 1435 } 1436 /* fall through */ 1437 case IPV6_UNICAST_HOPS: 1438 case IPV6_RECVOPTS: 1439 case IPV6_RECVRETOPTS: 1440 case IPV6_RECVDSTADDR: 1441 case IPV6_PORTRANGE: 1442 case IPV6_PKTINFO: 1443 case IPV6_HOPLIMIT: 1444 case IPV6_RTHDR: 1445 case IPV6_CHECKSUM: 1446 case IPV6_FAITH: 1447 #ifndef INET6_BINDV6ONLY 1448 case IPV6_BINDV6ONLY: 1449 #endif 1450 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1451 m->m_len = sizeof(int); 1452 switch (optname) { 1453 1454 case IPV6_UNICAST_HOPS: 1455 optval = in6p->in6p_hops; 1456 break; 1457 1458 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1459 1460 case IPV6_RECVOPTS: 1461 optval = OPTBIT(IN6P_RECVOPTS); 1462 break; 1463 1464 case IPV6_RECVRETOPTS: 1465 optval = OPTBIT(IN6P_RECVRETOPTS); 1466 break; 1467 1468 case IPV6_RECVDSTADDR: 1469 optval = OPTBIT(IN6P_RECVDSTADDR); 1470 break; 1471 1472 case IPV6_PORTRANGE: 1473 { 1474 int flags; 1475 flags = in6p->in6p_flags; 1476 if (flags & IN6P_HIGHPORT) 1477 optval = IPV6_PORTRANGE_HIGH; 1478 else if (flags & IN6P_LOWPORT) 1479 optval = IPV6_PORTRANGE_LOW; 1480 else 1481 optval = 0; 1482 break; 1483 } 1484 1485 case IPV6_PKTINFO: 1486 optval = OPTBIT(IN6P_PKTINFO); 1487 break; 1488 1489 case IPV6_HOPLIMIT: 1490 optval = OPTBIT(IN6P_HOPLIMIT); 1491 break; 1492 1493 case IPV6_HOPOPTS: 1494 optval = OPTBIT(IN6P_HOPOPTS); 1495 break; 1496 1497 case IPV6_DSTOPTS: 1498 optval = OPTBIT(IN6P_DSTOPTS); 1499 break; 1500 1501 case IPV6_RTHDR: 1502 optval = OPTBIT(IN6P_RTHDR); 1503 break; 1504 1505 case IPV6_CHECKSUM: 1506 optval = in6p->in6p_cksum; 1507 break; 1508 1509 case IPV6_FAITH: 1510 optval = OPTBIT(IN6P_FAITH); 1511 break; 1512 1513 #ifndef INET6_BINDV6ONLY 1514 case IPV6_BINDV6ONLY: 1515 optval = OPTBIT(IN6P_BINDV6ONLY); 1516 break; 1517 #endif 1518 } 1519 *mtod(m, int *) = optval; 1520 break; 1521 1522 case IPV6_MULTICAST_IF: 1523 case IPV6_MULTICAST_HOPS: 1524 case IPV6_MULTICAST_LOOP: 1525 case IPV6_JOIN_GROUP: 1526 case IPV6_LEAVE_GROUP: 1527 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1528 break; 1529 1530 #ifdef IPSEC 1531 case IPV6_IPSEC_POLICY: 1532 { 1533 caddr_t req = NULL; 1534 size_t len = 0; 1535 1536 if (m) { 1537 req = mtod(m, caddr_t); 1538 len = m->m_len; 1539 } 1540 error = ipsec6_get_policy(in6p, req, len, mp); 1541 break; 1542 } 1543 #endif /* IPSEC */ 1544 1545 default: 1546 error = ENOPROTOOPT; 1547 break; 1548 } 1549 break; 1550 } 1551 } else { 1552 error = EINVAL; 1553 if (op == PRCO_SETOPT && *mp) 1554 (void)m_free(*mp); 1555 } 1556 return(error); 1557 } 1558 1559 /* 1560 * Set up IP6 options in pcb for insertion in output packets. 1561 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1562 * with destination address if source routed. 1563 */ 1564 static int 1565 ip6_pcbopts(pktopt, m, so) 1566 struct ip6_pktopts **pktopt; 1567 struct mbuf *m; 1568 struct socket *so; 1569 { 1570 struct ip6_pktopts *opt = *pktopt; 1571 int error = 0; 1572 struct proc *p = (curproc ? curproc->l_proc : 0); /* XXX */ 1573 int priv = 0; 1574 1575 /* turn off any old options. */ 1576 if (opt) { 1577 if (opt->ip6po_m) 1578 (void)m_free(opt->ip6po_m); 1579 } else 1580 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1581 *pktopt = 0; 1582 1583 if (!m || m->m_len == 0) { 1584 /* 1585 * Only turning off any previous options. 1586 */ 1587 if (opt) 1588 free(opt, M_IP6OPT); 1589 if (m) 1590 (void)m_free(m); 1591 return(0); 1592 } 1593 1594 /* set options specified by user. */ 1595 if (p && !suser(p->p_ucred, &p->p_acflag)) 1596 priv = 1; 1597 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1598 (void)m_free(m); 1599 return(error); 1600 } 1601 *pktopt = opt; 1602 return(0); 1603 } 1604 1605 /* 1606 * Set the IP6 multicast options in response to user setsockopt(). 1607 */ 1608 static int 1609 ip6_setmoptions(optname, im6op, m) 1610 int optname; 1611 struct ip6_moptions **im6op; 1612 struct mbuf *m; 1613 { 1614 int error = 0; 1615 u_int loop, ifindex; 1616 struct ipv6_mreq *mreq; 1617 struct ifnet *ifp; 1618 struct ip6_moptions *im6o = *im6op; 1619 struct route_in6 ro; 1620 struct sockaddr_in6 *dst; 1621 struct in6_multi_mship *imm; 1622 struct proc *p = curproc->l_proc; /* XXX */ 1623 1624 if (im6o == NULL) { 1625 /* 1626 * No multicast option buffer attached to the pcb; 1627 * allocate one and initialize to default values. 1628 */ 1629 im6o = (struct ip6_moptions *) 1630 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1631 1632 if (im6o == NULL) 1633 return(ENOBUFS); 1634 *im6op = im6o; 1635 im6o->im6o_multicast_ifp = NULL; 1636 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1637 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1638 LIST_INIT(&im6o->im6o_memberships); 1639 } 1640 1641 switch (optname) { 1642 1643 case IPV6_MULTICAST_IF: 1644 /* 1645 * Select the interface for outgoing multicast packets. 1646 */ 1647 if (m == NULL || m->m_len != sizeof(u_int)) { 1648 error = EINVAL; 1649 break; 1650 } 1651 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1652 if (ifindex < 0 || if_index < ifindex) { 1653 error = ENXIO; /* XXX EINVAL? */ 1654 break; 1655 } 1656 ifp = ifindex2ifnet[ifindex]; 1657 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1658 error = EADDRNOTAVAIL; 1659 break; 1660 } 1661 im6o->im6o_multicast_ifp = ifp; 1662 break; 1663 1664 case IPV6_MULTICAST_HOPS: 1665 { 1666 /* 1667 * Set the IP6 hoplimit for outgoing multicast packets. 1668 */ 1669 int optval; 1670 if (m == NULL || m->m_len != sizeof(int)) { 1671 error = EINVAL; 1672 break; 1673 } 1674 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1675 if (optval < -1 || optval >= 256) 1676 error = EINVAL; 1677 else if (optval == -1) 1678 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1679 else 1680 im6o->im6o_multicast_hlim = optval; 1681 break; 1682 } 1683 1684 case IPV6_MULTICAST_LOOP: 1685 /* 1686 * Set the loopback flag for outgoing multicast packets. 1687 * Must be zero or one. 1688 */ 1689 if (m == NULL || m->m_len != sizeof(u_int)) { 1690 error = EINVAL; 1691 break; 1692 } 1693 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1694 if (loop > 1) { 1695 error = EINVAL; 1696 break; 1697 } 1698 im6o->im6o_multicast_loop = loop; 1699 break; 1700 1701 case IPV6_JOIN_GROUP: 1702 /* 1703 * Add a multicast group membership. 1704 * Group must be a valid IP6 multicast address. 1705 */ 1706 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1707 error = EINVAL; 1708 break; 1709 } 1710 mreq = mtod(m, struct ipv6_mreq *); 1711 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1712 /* 1713 * We use the unspecified address to specify to accept 1714 * all multicast addresses. Only super user is allowed 1715 * to do this. 1716 */ 1717 if (suser(p->p_ucred, &p->p_acflag)) 1718 { 1719 error = EACCES; 1720 break; 1721 } 1722 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1723 error = EINVAL; 1724 break; 1725 } 1726 1727 /* 1728 * If the interface is specified, validate it. 1729 */ 1730 if (mreq->ipv6mr_interface < 0 1731 || if_index < mreq->ipv6mr_interface) { 1732 error = ENXIO; /* XXX EINVAL? */ 1733 break; 1734 } 1735 /* 1736 * If no interface was explicitly specified, choose an 1737 * appropriate one according to the given multicast address. 1738 */ 1739 if (mreq->ipv6mr_interface == 0) { 1740 /* 1741 * If the multicast address is in node-local scope, 1742 * the interface should be a loopback interface. 1743 * Otherwise, look up the routing table for the 1744 * address, and choose the outgoing interface. 1745 * XXX: is it a good approach? 1746 */ 1747 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1748 ifp = &loif[0]; 1749 } else { 1750 ro.ro_rt = NULL; 1751 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1752 bzero(dst, sizeof(*dst)); 1753 dst->sin6_len = sizeof(struct sockaddr_in6); 1754 dst->sin6_family = AF_INET6; 1755 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1756 rtalloc((struct route *)&ro); 1757 if (ro.ro_rt == NULL) { 1758 error = EADDRNOTAVAIL; 1759 break; 1760 } 1761 ifp = ro.ro_rt->rt_ifp; 1762 rtfree(ro.ro_rt); 1763 } 1764 } else 1765 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1766 1767 /* 1768 * See if we found an interface, and confirm that it 1769 * supports multicast 1770 */ 1771 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1772 error = EADDRNOTAVAIL; 1773 break; 1774 } 1775 /* 1776 * Put interface index into the multicast address, 1777 * if the address has link-local scope. 1778 */ 1779 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1780 mreq->ipv6mr_multiaddr.s6_addr16[1] 1781 = htons(mreq->ipv6mr_interface); 1782 } 1783 /* 1784 * See if the membership already exists. 1785 */ 1786 for (imm = im6o->im6o_memberships.lh_first; 1787 imm != NULL; imm = imm->i6mm_chain.le_next) 1788 if (imm->i6mm_maddr->in6m_ifp == ifp && 1789 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1790 &mreq->ipv6mr_multiaddr)) 1791 break; 1792 if (imm != NULL) { 1793 error = EADDRINUSE; 1794 break; 1795 } 1796 /* 1797 * Everything looks good; add a new record to the multicast 1798 * address list for the given interface. 1799 */ 1800 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1801 if (imm == NULL) { 1802 error = ENOBUFS; 1803 break; 1804 } 1805 if ((imm->i6mm_maddr = 1806 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1807 free(imm, M_IPMADDR); 1808 break; 1809 } 1810 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1811 break; 1812 1813 case IPV6_LEAVE_GROUP: 1814 /* 1815 * Drop a multicast group membership. 1816 * Group must be a valid IP6 multicast address. 1817 */ 1818 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1819 error = EINVAL; 1820 break; 1821 } 1822 mreq = mtod(m, struct ipv6_mreq *); 1823 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1824 if (suser(p->p_ucred, &p->p_acflag)) 1825 { 1826 error = EACCES; 1827 break; 1828 } 1829 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1830 error = EINVAL; 1831 break; 1832 } 1833 /* 1834 * If an interface address was specified, get a pointer 1835 * to its ifnet structure. 1836 */ 1837 if (mreq->ipv6mr_interface < 0 1838 || if_index < mreq->ipv6mr_interface) { 1839 error = ENXIO; /* XXX EINVAL? */ 1840 break; 1841 } 1842 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1843 /* 1844 * Put interface index into the multicast address, 1845 * if the address has link-local scope. 1846 */ 1847 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1848 mreq->ipv6mr_multiaddr.s6_addr16[1] 1849 = htons(mreq->ipv6mr_interface); 1850 } 1851 /* 1852 * Find the membership in the membership list. 1853 */ 1854 for (imm = im6o->im6o_memberships.lh_first; 1855 imm != NULL; imm = imm->i6mm_chain.le_next) { 1856 if ((ifp == NULL || 1857 imm->i6mm_maddr->in6m_ifp == ifp) && 1858 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1859 &mreq->ipv6mr_multiaddr)) 1860 break; 1861 } 1862 if (imm == NULL) { 1863 /* Unable to resolve interface */ 1864 error = EADDRNOTAVAIL; 1865 break; 1866 } 1867 /* 1868 * Give up the multicast address record to which the 1869 * membership points. 1870 */ 1871 LIST_REMOVE(imm, i6mm_chain); 1872 in6_delmulti(imm->i6mm_maddr); 1873 free(imm, M_IPMADDR); 1874 break; 1875 1876 default: 1877 error = EOPNOTSUPP; 1878 break; 1879 } 1880 1881 /* 1882 * If all options have default values, no need to keep the mbuf. 1883 */ 1884 if (im6o->im6o_multicast_ifp == NULL && 1885 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1886 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1887 im6o->im6o_memberships.lh_first == NULL) { 1888 free(*im6op, M_IPMOPTS); 1889 *im6op = NULL; 1890 } 1891 1892 return(error); 1893 } 1894 1895 /* 1896 * Return the IP6 multicast options in response to user getsockopt(). 1897 */ 1898 static int 1899 ip6_getmoptions(optname, im6o, mp) 1900 int optname; 1901 struct ip6_moptions *im6o; 1902 struct mbuf **mp; 1903 { 1904 u_int *hlim, *loop, *ifindex; 1905 1906 *mp = m_get(M_WAIT, MT_SOOPTS); 1907 1908 switch (optname) { 1909 1910 case IPV6_MULTICAST_IF: 1911 ifindex = mtod(*mp, u_int *); 1912 (*mp)->m_len = sizeof(u_int); 1913 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1914 *ifindex = 0; 1915 else 1916 *ifindex = im6o->im6o_multicast_ifp->if_index; 1917 return(0); 1918 1919 case IPV6_MULTICAST_HOPS: 1920 hlim = mtod(*mp, u_int *); 1921 (*mp)->m_len = sizeof(u_int); 1922 if (im6o == NULL) 1923 *hlim = ip6_defmcasthlim; 1924 else 1925 *hlim = im6o->im6o_multicast_hlim; 1926 return(0); 1927 1928 case IPV6_MULTICAST_LOOP: 1929 loop = mtod(*mp, u_int *); 1930 (*mp)->m_len = sizeof(u_int); 1931 if (im6o == NULL) 1932 *loop = ip6_defmcasthlim; 1933 else 1934 *loop = im6o->im6o_multicast_loop; 1935 return(0); 1936 1937 default: 1938 return(EOPNOTSUPP); 1939 } 1940 } 1941 1942 /* 1943 * Discard the IP6 multicast options. 1944 */ 1945 void 1946 ip6_freemoptions(im6o) 1947 struct ip6_moptions *im6o; 1948 { 1949 struct in6_multi_mship *imm; 1950 1951 if (im6o == NULL) 1952 return; 1953 1954 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1955 LIST_REMOVE(imm, i6mm_chain); 1956 if (imm->i6mm_maddr) 1957 in6_delmulti(imm->i6mm_maddr); 1958 free(imm, M_IPMADDR); 1959 } 1960 free(im6o, M_IPMOPTS); 1961 } 1962 1963 /* 1964 * Set IPv6 outgoing packet options based on advanced API. 1965 */ 1966 int 1967 ip6_setpktoptions(control, opt, priv) 1968 struct mbuf *control; 1969 struct ip6_pktopts *opt; 1970 int priv; 1971 { 1972 struct cmsghdr *cm = 0; 1973 1974 if (control == 0 || opt == 0) 1975 return(EINVAL); 1976 1977 bzero(opt, sizeof(*opt)); 1978 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1979 1980 /* 1981 * XXX: Currently, we assume all the optional information is stored 1982 * in a single mbuf. 1983 */ 1984 if (control->m_next) 1985 return(EINVAL); 1986 1987 opt->ip6po_m = control; 1988 1989 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1990 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1991 cm = mtod(control, struct cmsghdr *); 1992 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1993 return(EINVAL); 1994 if (cm->cmsg_level != IPPROTO_IPV6) 1995 continue; 1996 1997 switch (cm->cmsg_type) { 1998 case IPV6_PKTINFO: 1999 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2000 return(EINVAL); 2001 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2002 if (opt->ip6po_pktinfo->ipi6_ifindex && 2003 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2004 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2005 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2006 2007 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2008 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2009 return(ENXIO); 2010 } 2011 2012 /* 2013 * Check if the requested source address is indeed a 2014 * unicast address assigned to the node. 2015 */ 2016 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2017 struct ifaddr *ia; 2018 struct sockaddr_in6 sin6; 2019 2020 bzero(&sin6, sizeof(sin6)); 2021 sin6.sin6_len = sizeof(sin6); 2022 sin6.sin6_family = AF_INET6; 2023 sin6.sin6_addr = 2024 opt->ip6po_pktinfo->ipi6_addr; 2025 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2026 if (ia == NULL || 2027 (opt->ip6po_pktinfo->ipi6_ifindex && 2028 (ia->ifa_ifp->if_index != 2029 opt->ip6po_pktinfo->ipi6_ifindex))) { 2030 return(EADDRNOTAVAIL); 2031 } 2032 /* 2033 * Check if the requested source address is 2034 * indeed a unicast address assigned to the 2035 * node. 2036 */ 2037 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2038 return(EADDRNOTAVAIL); 2039 } 2040 break; 2041 2042 case IPV6_HOPLIMIT: 2043 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2044 return(EINVAL); 2045 2046 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2047 sizeof(opt->ip6po_hlim)); 2048 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2049 return(EINVAL); 2050 break; 2051 2052 case IPV6_NEXTHOP: 2053 if (!priv) 2054 return(EPERM); 2055 2056 if (cm->cmsg_len < sizeof(u_char) || 2057 /* check if cmsg_len is large enough for sa_len */ 2058 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2059 return(EINVAL); 2060 2061 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2062 2063 break; 2064 2065 case IPV6_HOPOPTS: 2066 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2067 return(EINVAL); 2068 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2069 if (cm->cmsg_len != 2070 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2071 return(EINVAL); 2072 break; 2073 2074 case IPV6_DSTOPTS: 2075 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2076 return(EINVAL); 2077 2078 /* 2079 * If there is no routing header yet, the destination 2080 * options header should be put on the 1st part. 2081 * Otherwise, the header should be on the 2nd part. 2082 * (See RFC 2460, section 4.1) 2083 */ 2084 if (opt->ip6po_rthdr == NULL) { 2085 opt->ip6po_dest1 = 2086 (struct ip6_dest *)CMSG_DATA(cm); 2087 if (cm->cmsg_len != 2088 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2089 << 3)) 2090 return(EINVAL); 2091 } 2092 else { 2093 opt->ip6po_dest2 = 2094 (struct ip6_dest *)CMSG_DATA(cm); 2095 if (cm->cmsg_len != 2096 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2097 << 3)) 2098 return(EINVAL); 2099 } 2100 break; 2101 2102 case IPV6_RTHDR: 2103 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2104 return(EINVAL); 2105 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2106 if (cm->cmsg_len != 2107 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2108 return(EINVAL); 2109 switch (opt->ip6po_rthdr->ip6r_type) { 2110 case IPV6_RTHDR_TYPE_0: 2111 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2112 return(EINVAL); 2113 break; 2114 default: 2115 return(EINVAL); 2116 } 2117 break; 2118 2119 default: 2120 return(ENOPROTOOPT); 2121 } 2122 } 2123 2124 return(0); 2125 } 2126 2127 /* 2128 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2129 * packet to the input queue of a specified interface. Note that this 2130 * calls the output routine of the loopback "driver", but with an interface 2131 * pointer that might NOT be &loif -- easier than replicating that code here. 2132 */ 2133 void 2134 ip6_mloopback(ifp, m, dst) 2135 struct ifnet *ifp; 2136 struct mbuf *m; 2137 struct sockaddr_in6 *dst; 2138 { 2139 struct mbuf *copym; 2140 struct ip6_hdr *ip6; 2141 2142 copym = m_copy(m, 0, M_COPYALL); 2143 if (copym == NULL) 2144 return; 2145 2146 /* 2147 * Make sure to deep-copy IPv6 header portion in case the data 2148 * is in an mbuf cluster, so that we can safely override the IPv6 2149 * header portion later. 2150 */ 2151 if ((copym->m_flags & M_EXT) != 0 || 2152 copym->m_len < sizeof(struct ip6_hdr)) { 2153 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2154 if (copym == NULL) 2155 return; 2156 } 2157 2158 #ifdef DIAGNOSTIC 2159 if (copym->m_len < sizeof(*ip6)) { 2160 m_freem(copym); 2161 return; 2162 } 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 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2172 } 2173 2174 /* 2175 * Chop IPv6 header off from the payload. 2176 */ 2177 static int 2178 ip6_splithdr(m, exthdrs) 2179 struct mbuf *m; 2180 struct ip6_exthdrs *exthdrs; 2181 { 2182 struct mbuf *mh; 2183 struct ip6_hdr *ip6; 2184 2185 ip6 = mtod(m, struct ip6_hdr *); 2186 if (m->m_len > sizeof(*ip6)) { 2187 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2188 if (mh == 0) { 2189 m_freem(m); 2190 return ENOBUFS; 2191 } 2192 M_COPY_PKTHDR(mh, m); 2193 MH_ALIGN(mh, sizeof(*ip6)); 2194 m->m_flags &= ~M_PKTHDR; 2195 m->m_len -= sizeof(*ip6); 2196 m->m_data += sizeof(*ip6); 2197 mh->m_next = m; 2198 m = mh; 2199 m->m_len = sizeof(*ip6); 2200 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2201 } 2202 exthdrs->ip6e_ip6 = m; 2203 return 0; 2204 } 2205 2206 /* 2207 * Compute IPv6 extension header length. 2208 */ 2209 int 2210 ip6_optlen(in6p) 2211 struct in6pcb *in6p; 2212 { 2213 int len; 2214 2215 if (!in6p->in6p_outputopts) 2216 return 0; 2217 2218 len = 0; 2219 #define elen(x) \ 2220 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2221 2222 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2223 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2224 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2225 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2226 return len; 2227 #undef elen 2228 } 2229
Indexes created Tue Sep 30 20:09:53 GMT 2025