ip6_output.c revision 1.51
1 /* $NetBSD: ip6_output.c,v 1.51 2002/06/07 14:48:56 itojun Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.51 2002/06/07 14:48:56 itojun Exp $"); 70 71 #include "opt_inet.h" 72 #include "opt_ipsec.h" 73 #include "opt_pfil_hooks.h" 74 75 #include <sys/param.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/errno.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/systm.h> 83 #include <sys/proc.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #ifdef PFIL_HOOKS 88 #include <net/pfil.h> 89 #endif 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/icmp6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/in6_pcb.h> 97 #include <netinet6/nd6.h> 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #include <netkey/key.h> 102 #endif /* IPSEC */ 103 104 #include "loop.h" 105 106 #include <net/net_osdep.h> 107 108 #ifdef PFIL_HOOKS 109 extern struct pfil_head inet6_pfil_hook; /* XXX */ 110 #endif 111 112 struct ip6_exthdrs { 113 struct mbuf *ip6e_ip6; 114 struct mbuf *ip6e_hbh; 115 struct mbuf *ip6e_dest1; 116 struct mbuf *ip6e_rthdr; 117 struct mbuf *ip6e_dest2; 118 }; 119 120 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 121 struct socket *)); 122 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 123 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 124 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 125 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 126 struct ip6_frag **)); 127 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 128 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 129 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 130 struct ifnet *, struct in6_addr *, u_long *)); 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, nexthdrp, IPPROTO_HOPOPTS); 343 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 344 IPPROTO_DSTOPTS); 345 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 346 IPPROTO_ROUTING); 347 348 #ifdef IPSEC 349 if (!needipsec) 350 goto skip_ipsec2; 351 352 /* 353 * pointers after IPsec headers are not valid any more. 354 * other pointers need a great care too. 355 * (IPsec routines should not mangle mbufs prior to AH/ESP) 356 */ 357 exthdrs.ip6e_dest2 = NULL; 358 359 { 360 struct ip6_rthdr *rh = NULL; 361 int segleft_org = 0; 362 struct ipsec_output_state state; 363 364 if (exthdrs.ip6e_rthdr) { 365 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 366 segleft_org = rh->ip6r_segleft; 367 rh->ip6r_segleft = 0; 368 } 369 370 bzero(&state, sizeof(state)); 371 state.m = m; 372 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 373 &needipsectun); 374 m = state.m; 375 if (error) { 376 /* mbuf is already reclaimed in ipsec6_output_trans. */ 377 m = NULL; 378 switch (error) { 379 case EHOSTUNREACH: 380 case ENETUNREACH: 381 case EMSGSIZE: 382 case ENOBUFS: 383 case ENOMEM: 384 break; 385 default: 386 printf("ip6_output (ipsec): error code %d\n", error); 387 /* FALLTHROUGH */ 388 case ENOENT: 389 /* don't show these error codes to the user */ 390 error = 0; 391 break; 392 } 393 goto bad; 394 } 395 if (exthdrs.ip6e_rthdr) { 396 /* ah6_output doesn't modify mbuf chain */ 397 rh->ip6r_segleft = segleft_org; 398 } 399 } 400 skip_ipsec2:; 401 #endif 402 } 403 404 /* 405 * If there is a routing header, replace destination address field 406 * with the first hop of the routing header. 407 */ 408 if (exthdrs.ip6e_rthdr) { 409 struct ip6_rthdr *rh; 410 struct ip6_rthdr0 *rh0; 411 412 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 413 struct ip6_rthdr *)); 414 finaldst = ip6->ip6_dst; 415 switch (rh->ip6r_type) { 416 case IPV6_RTHDR_TYPE_0: 417 rh0 = (struct ip6_rthdr0 *)rh; 418 ip6->ip6_dst = rh0->ip6r0_addr[0]; 419 bcopy((caddr_t)&rh0->ip6r0_addr[1], 420 (caddr_t)&rh0->ip6r0_addr[0], 421 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 422 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 423 break; 424 default: /* is it possible? */ 425 error = EINVAL; 426 goto bad; 427 } 428 } 429 430 /* Source address validation */ 431 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 432 (flags & IPV6_DADOUTPUT) == 0) { 433 error = EOPNOTSUPP; 434 ip6stat.ip6s_badscope++; 435 goto bad; 436 } 437 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 438 error = EOPNOTSUPP; 439 ip6stat.ip6s_badscope++; 440 goto bad; 441 } 442 443 ip6stat.ip6s_localout++; 444 445 /* 446 * Route packet. 447 */ 448 if (ro == 0) { 449 ro = &ip6route; 450 bzero((caddr_t)ro, sizeof(*ro)); 451 } 452 ro_pmtu = ro; 453 if (opt && opt->ip6po_rthdr) 454 ro = &opt->ip6po_route; 455 dst = (struct sockaddr_in6 *)&ro->ro_dst; 456 /* 457 * If there is a cached route, 458 * check that it is to the same destination 459 * and is still up. If not, free it and try again. 460 */ 461 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 462 dst->sin6_family != AF_INET6 || 463 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 464 RTFREE(ro->ro_rt); 465 ro->ro_rt = (struct rtentry *)0; 466 } 467 if (ro->ro_rt == 0) { 468 bzero(dst, sizeof(*dst)); 469 dst->sin6_family = AF_INET6; 470 dst->sin6_len = sizeof(struct sockaddr_in6); 471 dst->sin6_addr = ip6->ip6_dst; 472 } 473 #ifdef IPSEC 474 if (needipsec && needipsectun) { 475 struct ipsec_output_state state; 476 477 /* 478 * All the extension headers will become inaccessible 479 * (since they can be encrypted). 480 * Don't panic, we need no more updates to extension headers 481 * on inner IPv6 packet (since they are now encapsulated). 482 * 483 * IPv6 [ESP|AH] IPv6 [extension headers] payload 484 */ 485 bzero(&exthdrs, sizeof(exthdrs)); 486 exthdrs.ip6e_ip6 = m; 487 488 bzero(&state, sizeof(state)); 489 state.m = m; 490 state.ro = (struct route *)ro; 491 state.dst = (struct sockaddr *)dst; 492 493 error = ipsec6_output_tunnel(&state, sp, flags); 494 495 m = state.m; 496 ro = (struct route_in6 *)state.ro; 497 dst = (struct sockaddr_in6 *)state.dst; 498 if (error) { 499 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 500 m0 = m = NULL; 501 m = NULL; 502 switch (error) { 503 case EHOSTUNREACH: 504 case ENETUNREACH: 505 case EMSGSIZE: 506 case ENOBUFS: 507 case ENOMEM: 508 break; 509 default: 510 printf("ip6_output (ipsec): error code %d\n", error); 511 /* FALLTHROUGH */ 512 case ENOENT: 513 /* don't show these error codes to the user */ 514 error = 0; 515 break; 516 } 517 goto bad; 518 } 519 520 exthdrs.ip6e_ip6 = m; 521 } 522 #endif /* IPSEC */ 523 524 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 525 /* Unicast */ 526 527 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 528 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 529 /* xxx 530 * interface selection comes here 531 * if an interface is specified from an upper layer, 532 * ifp must point it. 533 */ 534 if (ro->ro_rt == 0) { 535 /* 536 * non-bsdi always clone routes, if parent is 537 * PRF_CLONING. 538 */ 539 rtalloc((struct route *)ro); 540 } 541 if (ro->ro_rt == 0) { 542 ip6stat.ip6s_noroute++; 543 error = EHOSTUNREACH; 544 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 545 goto bad; 546 } 547 ia = ifatoia6(ro->ro_rt->rt_ifa); 548 ifp = ro->ro_rt->rt_ifp; 549 ro->ro_rt->rt_use++; 550 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 551 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 552 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 553 554 in6_ifstat_inc(ifp, ifs6_out_request); 555 556 /* 557 * Check if the outgoing interface conflicts with 558 * the interface specified by ifi6_ifindex (if specified). 559 * Note that loopback interface is always okay. 560 * (this may happen when we are sending a packet to one of 561 * our own addresses.) 562 */ 563 if (opt && opt->ip6po_pktinfo 564 && opt->ip6po_pktinfo->ipi6_ifindex) { 565 if (!(ifp->if_flags & IFF_LOOPBACK) 566 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 567 ip6stat.ip6s_noroute++; 568 in6_ifstat_inc(ifp, ifs6_out_discard); 569 error = EHOSTUNREACH; 570 goto bad; 571 } 572 } 573 574 if (opt && opt->ip6po_hlim != -1) 575 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 576 } else { 577 /* Multicast */ 578 struct in6_multi *in6m; 579 580 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 581 582 /* 583 * See if the caller provided any multicast options 584 */ 585 ifp = NULL; 586 if (im6o != NULL) { 587 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 588 if (im6o->im6o_multicast_ifp != NULL) 589 ifp = im6o->im6o_multicast_ifp; 590 } else 591 ip6->ip6_hlim = ip6_defmcasthlim; 592 593 /* 594 * See if the caller provided the outgoing interface 595 * as an ancillary data. 596 * Boundary check for ifindex is assumed to be already done. 597 */ 598 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 599 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 600 601 /* 602 * If the destination is a node-local scope multicast, 603 * the packet should be loop-backed only. 604 */ 605 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 606 /* 607 * If the outgoing interface is already specified, 608 * it should be a loopback interface. 609 */ 610 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 611 ip6stat.ip6s_badscope++; 612 error = ENETUNREACH; /* XXX: better error? */ 613 /* XXX correct ifp? */ 614 in6_ifstat_inc(ifp, ifs6_out_discard); 615 goto bad; 616 } else { 617 ifp = &loif[0]; 618 } 619 } 620 621 if (opt && opt->ip6po_hlim != -1) 622 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 623 624 /* 625 * If caller did not provide an interface lookup a 626 * default in the routing table. This is either a 627 * default for the speicfied group (i.e. a host 628 * route), or a multicast default (a route for the 629 * ``net'' ff00::/8). 630 */ 631 if (ifp == NULL) { 632 if (ro->ro_rt == 0) { 633 ro->ro_rt = rtalloc1((struct sockaddr *) 634 &ro->ro_dst, 0); 635 } 636 if (ro->ro_rt == 0) { 637 ip6stat.ip6s_noroute++; 638 error = EHOSTUNREACH; 639 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 640 goto bad; 641 } 642 ia = ifatoia6(ro->ro_rt->rt_ifa); 643 ifp = ro->ro_rt->rt_ifp; 644 ro->ro_rt->rt_use++; 645 } 646 647 if ((flags & IPV6_FORWARDING) == 0) 648 in6_ifstat_inc(ifp, ifs6_out_request); 649 in6_ifstat_inc(ifp, ifs6_out_mcast); 650 651 /* 652 * Confirm that the outgoing interface supports multicast. 653 */ 654 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 655 ip6stat.ip6s_noroute++; 656 in6_ifstat_inc(ifp, ifs6_out_discard); 657 error = ENETUNREACH; 658 goto bad; 659 } 660 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 661 if (in6m != NULL && 662 (im6o == NULL || im6o->im6o_multicast_loop)) { 663 /* 664 * If we belong to the destination multicast group 665 * on the outgoing interface, and the caller did not 666 * forbid loopback, loop back a copy. 667 */ 668 ip6_mloopback(ifp, m, dst); 669 } else { 670 /* 671 * If we are acting as a multicast router, perform 672 * multicast forwarding as if the packet had just 673 * arrived on the interface to which we are about 674 * to send. The multicast forwarding function 675 * recursively calls this function, using the 676 * IPV6_FORWARDING flag to prevent infinite recursion. 677 * 678 * Multicasts that are looped back by ip6_mloopback(), 679 * above, will be forwarded by the ip6_input() routine, 680 * if necessary. 681 */ 682 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 683 if (ip6_mforward(ip6, ifp, m) != 0) { 684 m_freem(m); 685 goto done; 686 } 687 } 688 } 689 /* 690 * Multicasts with a hoplimit of zero may be looped back, 691 * above, but must not be transmitted on a network. 692 * Also, multicasts addressed to the loopback interface 693 * are not sent -- the above call to ip6_mloopback() will 694 * loop back a copy if this host actually belongs to the 695 * destination group on the loopback interface. 696 */ 697 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 698 m_freem(m); 699 goto done; 700 } 701 } 702 703 /* 704 * Fill the outgoing inteface to tell the upper layer 705 * to increment per-interface statistics. 706 */ 707 if (ifpp) 708 *ifpp = ifp; 709 710 /* Determine path MTU. */ 711 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu)) != 0) 712 goto bad; 713 714 /* 715 * The caller of this function may specify to use the minimum MTU 716 * in some cases. 717 */ 718 if (mtu > IPV6_MMTU) { 719 if ((flags & IPV6_MINMTU)) 720 mtu = IPV6_MMTU; 721 } 722 723 /* Fake scoped addresses */ 724 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 725 /* 726 * If source or destination address is a scoped address, and 727 * the packet is going to be sent to a loopback interface, 728 * we should keep the original interface. 729 */ 730 731 /* 732 * XXX: this is a very experimental and temporary solution. 733 * We eventually have sockaddr_in6 and use the sin6_scope_id 734 * field of the structure here. 735 * We rely on the consistency between two scope zone ids 736 * of source add destination, which should already be assured 737 * Larger scopes than link will be supported in the near 738 * future. 739 */ 740 origifp = NULL; 741 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 742 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 743 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 744 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 745 /* 746 * XXX: origifp can be NULL even in those two cases above. 747 * For example, if we remove the (only) link-local address 748 * from the loopback interface, and try to send a link-local 749 * address without link-id information. Then the source 750 * address is ::1, and the destination address is the 751 * link-local address with its s6_addr16[1] being zero. 752 * What is worse, if the packet goes to the loopback interface 753 * by a default rejected route, the null pointer would be 754 * passed to looutput, and the kernel would hang. 755 * The following last resort would prevent such disaster. 756 */ 757 if (origifp == NULL) 758 origifp = ifp; 759 } else 760 origifp = ifp; 761 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 762 ip6->ip6_src.s6_addr16[1] = 0; 763 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 764 ip6->ip6_dst.s6_addr16[1] = 0; 765 766 /* 767 * If the outgoing packet contains a hop-by-hop options header, 768 * it must be examined and processed even by the source node. 769 * (RFC 2460, section 4.) 770 */ 771 if (exthdrs.ip6e_hbh) { 772 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 773 u_int32_t dummy1; /* XXX unused */ 774 u_int32_t dummy2; /* XXX unused */ 775 776 /* 777 * XXX: if we have to send an ICMPv6 error to the sender, 778 * we need the M_LOOP flag since icmp6_error() expects 779 * the IPv6 and the hop-by-hop options header are 780 * continuous unless the flag is set. 781 */ 782 m->m_flags |= M_LOOP; 783 m->m_pkthdr.rcvif = ifp; 784 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 785 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 786 &dummy1, &dummy2) < 0) { 787 /* m was already freed at this point */ 788 error = EINVAL;/* better error? */ 789 goto done; 790 } 791 m->m_flags &= ~M_LOOP; /* XXX */ 792 m->m_pkthdr.rcvif = NULL; 793 } 794 795 #ifdef PFIL_HOOKS 796 /* 797 * Run through list of hooks for output packets. 798 */ 799 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 800 goto done; 801 if (m == NULL) 802 goto done; 803 ip6 = mtod(m, struct ip6_hdr *); 804 #endif /* PFIL_HOOKS */ 805 /* 806 * Send the packet to the outgoing interface. 807 * If necessary, do IPv6 fragmentation before sending. 808 */ 809 tlen = m->m_pkthdr.len; 810 if (tlen <= mtu) { 811 #ifdef IFA_STATS 812 struct in6_ifaddr *ia6; 813 ip6 = mtod(m, struct ip6_hdr *); 814 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 815 if (ia6) { 816 /* Record statistics for this interface address. */ 817 ia6->ia_ifa.ifa_data.ifad_outbytes += 818 m->m_pkthdr.len; 819 } 820 #endif 821 #ifdef IPSEC 822 /* clean ipsec history once it goes out of the node */ 823 ipsec_delaux(m); 824 #endif 825 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 826 goto done; 827 } else if (mtu < IPV6_MMTU) { 828 /* 829 * note that path MTU is never less than IPV6_MMTU 830 * (see icmp6_input). 831 */ 832 error = EMSGSIZE; 833 in6_ifstat_inc(ifp, ifs6_out_fragfail); 834 goto bad; 835 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 836 error = EMSGSIZE; 837 in6_ifstat_inc(ifp, ifs6_out_fragfail); 838 goto bad; 839 } else { 840 struct mbuf **mnext, *m_frgpart; 841 struct ip6_frag *ip6f; 842 u_int32_t id = htonl(ip6_id++); 843 u_char nextproto; 844 845 /* 846 * Too large for the destination or interface; 847 * fragment if possible. 848 * Must be able to put at least 8 bytes per fragment. 849 */ 850 hlen = unfragpartlen; 851 if (mtu > IPV6_MAXPACKET) 852 mtu = IPV6_MAXPACKET; 853 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 854 if (len < 8) { 855 error = EMSGSIZE; 856 in6_ifstat_inc(ifp, ifs6_out_fragfail); 857 goto bad; 858 } 859 860 mnext = &m->m_nextpkt; 861 862 /* 863 * Change the next header field of the last header in the 864 * unfragmentable part. 865 */ 866 if (exthdrs.ip6e_rthdr) { 867 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 868 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 869 } else if (exthdrs.ip6e_dest1) { 870 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 871 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 872 } else if (exthdrs.ip6e_hbh) { 873 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 874 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 875 } else { 876 nextproto = ip6->ip6_nxt; 877 ip6->ip6_nxt = IPPROTO_FRAGMENT; 878 } 879 880 /* 881 * Loop through length of segment after first fragment, 882 * make new header and copy data of each part and link onto 883 * chain. 884 */ 885 m0 = m; 886 for (off = hlen; off < tlen; off += len) { 887 MGETHDR(m, M_DONTWAIT, MT_HEADER); 888 if (!m) { 889 error = ENOBUFS; 890 ip6stat.ip6s_odropped++; 891 goto sendorfree; 892 } 893 m->m_flags = m0->m_flags & M_COPYFLAGS; 894 *mnext = m; 895 mnext = &m->m_nextpkt; 896 m->m_data += max_linkhdr; 897 mhip6 = mtod(m, struct ip6_hdr *); 898 *mhip6 = *ip6; 899 m->m_len = sizeof(*mhip6); 900 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 901 if (error) { 902 ip6stat.ip6s_odropped++; 903 goto sendorfree; 904 } 905 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 906 if (off + len >= tlen) 907 len = tlen - off; 908 else 909 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 910 mhip6->ip6_plen = htons((u_short)(len + hlen + 911 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 912 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 913 error = ENOBUFS; 914 ip6stat.ip6s_odropped++; 915 goto sendorfree; 916 } 917 m_cat(m, m_frgpart); 918 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 919 m->m_pkthdr.rcvif = (struct ifnet *)0; 920 ip6f->ip6f_reserved = 0; 921 ip6f->ip6f_ident = id; 922 ip6f->ip6f_nxt = nextproto; 923 ip6stat.ip6s_ofragments++; 924 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 925 } 926 927 in6_ifstat_inc(ifp, ifs6_out_fragok); 928 } 929 930 /* 931 * Remove leading garbages. 932 */ 933 sendorfree: 934 m = m0->m_nextpkt; 935 m0->m_nextpkt = 0; 936 m_freem(m0); 937 for (m0 = m; m; m = m0) { 938 m0 = m->m_nextpkt; 939 m->m_nextpkt = 0; 940 if (error == 0) { 941 #ifdef IFA_STATS 942 struct in6_ifaddr *ia6; 943 ip6 = mtod(m, struct ip6_hdr *); 944 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 945 if (ia6) { 946 /* 947 * Record statistics for this interface 948 * address. 949 */ 950 ia6->ia_ifa.ifa_data.ifad_outbytes += 951 m->m_pkthdr.len; 952 } 953 #endif 954 #ifdef IPSEC 955 /* clean ipsec history once it goes out of the node */ 956 ipsec_delaux(m); 957 #endif 958 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 959 } else 960 m_freem(m); 961 } 962 963 if (error == 0) 964 ip6stat.ip6s_fragmented++; 965 966 done: 967 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 968 RTFREE(ro->ro_rt); 969 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 970 RTFREE(ro_pmtu->ro_rt); 971 } 972 973 #ifdef IPSEC 974 if (sp != NULL) 975 key_freesp(sp); 976 #endif /* IPSEC */ 977 978 return(error); 979 980 freehdrs: 981 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 982 m_freem(exthdrs.ip6e_dest1); 983 m_freem(exthdrs.ip6e_rthdr); 984 m_freem(exthdrs.ip6e_dest2); 985 /* FALLTHROUGH */ 986 bad: 987 m_freem(m); 988 goto done; 989 } 990 991 static int 992 ip6_copyexthdr(mp, hdr, hlen) 993 struct mbuf **mp; 994 caddr_t hdr; 995 int hlen; 996 { 997 struct mbuf *m; 998 999 if (hlen > MCLBYTES) 1000 return(ENOBUFS); /* XXX */ 1001 1002 MGET(m, M_DONTWAIT, MT_DATA); 1003 if (!m) 1004 return(ENOBUFS); 1005 1006 if (hlen > MLEN) { 1007 MCLGET(m, M_DONTWAIT); 1008 if ((m->m_flags & M_EXT) == 0) { 1009 m_free(m); 1010 return(ENOBUFS); 1011 } 1012 } 1013 m->m_len = hlen; 1014 if (hdr) 1015 bcopy(hdr, mtod(m, caddr_t), hlen); 1016 1017 *mp = m; 1018 return(0); 1019 } 1020 1021 /* 1022 * Insert jumbo payload option. 1023 */ 1024 static int 1025 ip6_insert_jumboopt(exthdrs, plen) 1026 struct ip6_exthdrs *exthdrs; 1027 u_int32_t plen; 1028 { 1029 struct mbuf *mopt; 1030 u_char *optbuf; 1031 u_int32_t v; 1032 1033 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1034 1035 /* 1036 * If there is no hop-by-hop options header, allocate new one. 1037 * If there is one but it doesn't have enough space to store the 1038 * jumbo payload option, allocate a cluster to store the whole options. 1039 * Otherwise, use it to store the options. 1040 */ 1041 if (exthdrs->ip6e_hbh == 0) { 1042 MGET(mopt, M_DONTWAIT, MT_DATA); 1043 if (mopt == 0) 1044 return(ENOBUFS); 1045 mopt->m_len = JUMBOOPTLEN; 1046 optbuf = mtod(mopt, u_char *); 1047 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1048 exthdrs->ip6e_hbh = mopt; 1049 } else { 1050 struct ip6_hbh *hbh; 1051 1052 mopt = exthdrs->ip6e_hbh; 1053 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1054 /* 1055 * XXX assumption: 1056 * - exthdrs->ip6e_hbh is not referenced from places 1057 * other than exthdrs. 1058 * - exthdrs->ip6e_hbh is not an mbuf chain. 1059 */ 1060 int oldoptlen = mopt->m_len; 1061 struct mbuf *n; 1062 1063 /* 1064 * XXX: give up if the whole (new) hbh header does 1065 * not fit even in an mbuf cluster. 1066 */ 1067 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1068 return(ENOBUFS); 1069 1070 /* 1071 * As a consequence, we must always prepare a cluster 1072 * at this point. 1073 */ 1074 MGET(n, M_DONTWAIT, MT_DATA); 1075 if (n) { 1076 MCLGET(n, M_DONTWAIT); 1077 if ((n->m_flags & M_EXT) == 0) { 1078 m_freem(n); 1079 n = NULL; 1080 } 1081 } 1082 if (!n) 1083 return(ENOBUFS); 1084 n->m_len = oldoptlen + JUMBOOPTLEN; 1085 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1086 oldoptlen); 1087 optbuf = mtod(n, caddr_t) + oldoptlen; 1088 m_freem(mopt); 1089 mopt = exthdrs->ip6e_hbh = n; 1090 } else { 1091 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1092 mopt->m_len += JUMBOOPTLEN; 1093 } 1094 optbuf[0] = IP6OPT_PADN; 1095 optbuf[1] = 1; 1096 1097 /* 1098 * Adjust the header length according to the pad and 1099 * the jumbo payload option. 1100 */ 1101 hbh = mtod(mopt, struct ip6_hbh *); 1102 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1103 } 1104 1105 /* fill in the option. */ 1106 optbuf[2] = IP6OPT_JUMBO; 1107 optbuf[3] = 4; 1108 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1109 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1110 1111 /* finally, adjust the packet header length */ 1112 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1113 1114 return(0); 1115 #undef JUMBOOPTLEN 1116 } 1117 1118 /* 1119 * Insert fragment header and copy unfragmentable header portions. 1120 */ 1121 static int 1122 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1123 struct mbuf *m0, *m; 1124 int hlen; 1125 struct ip6_frag **frghdrp; 1126 { 1127 struct mbuf *n, *mlast; 1128 1129 if (hlen > sizeof(struct ip6_hdr)) { 1130 n = m_copym(m0, sizeof(struct ip6_hdr), 1131 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1132 if (n == 0) 1133 return(ENOBUFS); 1134 m->m_next = n; 1135 } else 1136 n = m; 1137 1138 /* Search for the last mbuf of unfragmentable part. */ 1139 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1140 ; 1141 1142 if ((mlast->m_flags & M_EXT) == 0 && 1143 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1144 /* use the trailing space of the last mbuf for the fragment hdr */ 1145 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1146 mlast->m_len); 1147 mlast->m_len += sizeof(struct ip6_frag); 1148 m->m_pkthdr.len += sizeof(struct ip6_frag); 1149 } else { 1150 /* allocate a new mbuf for the fragment header */ 1151 struct mbuf *mfrg; 1152 1153 MGET(mfrg, M_DONTWAIT, MT_DATA); 1154 if (mfrg == 0) 1155 return(ENOBUFS); 1156 mfrg->m_len = sizeof(struct ip6_frag); 1157 *frghdrp = mtod(mfrg, struct ip6_frag *); 1158 mlast->m_next = mfrg; 1159 } 1160 1161 return(0); 1162 } 1163 1164 static int 1165 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup) 1166 struct route_in6 *ro_pmtu, *ro; 1167 struct ifnet *ifp; 1168 struct in6_addr *dst; 1169 u_long *mtup; 1170 { 1171 u_int32_t mtu = 0; 1172 int error = 0; 1173 1174 if (ro_pmtu != ro) { 1175 /* The first hop and the final destination may differ. */ 1176 struct sockaddr_in6 *sa6_dst = 1177 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1178 if (ro_pmtu->ro_rt && 1179 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1180 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1181 RTFREE(ro_pmtu->ro_rt); 1182 ro_pmtu->ro_rt = (struct rtentry *)0; 1183 } 1184 if (ro_pmtu->ro_rt == 0) { 1185 bzero(sa6_dst, sizeof(*sa6_dst)); 1186 sa6_dst->sin6_family = AF_INET6; 1187 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1188 sa6_dst->sin6_addr = *dst; 1189 1190 rtalloc((struct route *)ro_pmtu); 1191 } 1192 } 1193 if (ro_pmtu->ro_rt) { 1194 u_int32_t ifmtu; 1195 1196 if (ifp == NULL) 1197 ifp = ro_pmtu->ro_rt->rt_ifp; 1198 ifmtu = IN6_LINKMTU(ifp); 1199 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1200 if (mtu == 0) 1201 mtu = ifmtu; 1202 else if (mtu > ifmtu) { 1203 /* 1204 * The MTU on the route is larger than the MTU on 1205 * the interface! This shouldn't happen, unless the 1206 * MTU of the interface has been changed after the 1207 * interface was brought up. Change the MTU in the 1208 * route to match the interface MTU (as long as the 1209 * field isn't locked). 1210 * 1211 * if MTU on the route is 0, we need to fix the MTU. 1212 * this case happens with path MTU discovery timeouts. 1213 */ 1214 mtu = ifmtu; 1215 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1216 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1217 } 1218 } else if (ifp) { 1219 mtu = IN6_LINKMTU(ifp); 1220 } else 1221 error = EHOSTUNREACH; /* XXX */ 1222 1223 *mtup = mtu; 1224 return(error); 1225 } 1226 1227 /* 1228 * IP6 socket option processing. 1229 */ 1230 int 1231 ip6_ctloutput(op, so, level, optname, mp) 1232 int op; 1233 struct socket *so; 1234 int level, optname; 1235 struct mbuf **mp; 1236 { 1237 struct in6pcb *in6p = sotoin6pcb(so); 1238 struct mbuf *m = *mp; 1239 int optval = 0; 1240 int error = 0; 1241 struct proc *p = curproc; /* XXX */ 1242 1243 if (level == IPPROTO_IPV6) { 1244 switch (op) { 1245 case PRCO_SETOPT: 1246 switch (optname) { 1247 case IPV6_PKTOPTIONS: 1248 /* m is freed in ip6_pcbopts */ 1249 return(ip6_pcbopts(&in6p->in6p_outputopts, 1250 m, so)); 1251 case IPV6_HOPOPTS: 1252 case IPV6_DSTOPTS: 1253 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1254 error = EPERM; 1255 break; 1256 } 1257 /* FALLTHROUGH */ 1258 case IPV6_UNICAST_HOPS: 1259 case IPV6_RECVOPTS: 1260 case IPV6_RECVRETOPTS: 1261 case IPV6_RECVDSTADDR: 1262 case IPV6_PKTINFO: 1263 case IPV6_HOPLIMIT: 1264 case IPV6_RTHDR: 1265 case IPV6_FAITH: 1266 case IPV6_V6ONLY: 1267 if (!m || m->m_len != sizeof(int)) { 1268 error = EINVAL; 1269 break; 1270 } 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 do { \ 1284 if (optval) \ 1285 in6p->in6p_flags |= (bit); \ 1286 else \ 1287 in6p->in6p_flags &= ~(bit); \ 1288 } while (0) 1289 1290 case IPV6_RECVOPTS: 1291 OPTSET(IN6P_RECVOPTS); 1292 break; 1293 1294 case IPV6_RECVRETOPTS: 1295 OPTSET(IN6P_RECVRETOPTS); 1296 break; 1297 1298 case IPV6_RECVDSTADDR: 1299 OPTSET(IN6P_RECVDSTADDR); 1300 break; 1301 1302 case IPV6_PKTINFO: 1303 OPTSET(IN6P_PKTINFO); 1304 break; 1305 1306 case IPV6_HOPLIMIT: 1307 OPTSET(IN6P_HOPLIMIT); 1308 break; 1309 1310 case IPV6_HOPOPTS: 1311 OPTSET(IN6P_HOPOPTS); 1312 break; 1313 1314 case IPV6_DSTOPTS: 1315 OPTSET(IN6P_DSTOPTS); 1316 break; 1317 1318 case IPV6_RTHDR: 1319 OPTSET(IN6P_RTHDR); 1320 break; 1321 1322 case IPV6_FAITH: 1323 OPTSET(IN6P_FAITH); 1324 break; 1325 1326 case IPV6_V6ONLY: 1327 /* 1328 * make setsockopt(IPV6_V6ONLY) 1329 * available only prior to bind(2). 1330 * see ipng mailing list, Jun 22 2001. 1331 */ 1332 if (in6p->in6p_lport || 1333 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1334 error = EINVAL; 1335 break; 1336 } 1337 #ifdef INET6_BINDV6ONLY 1338 if (!optval) 1339 error = EINVAL; 1340 #else 1341 OPTSET(IN6P_IPV6_V6ONLY); 1342 #endif 1343 break; 1344 } 1345 break; 1346 #undef OPTSET 1347 1348 case IPV6_MULTICAST_IF: 1349 case IPV6_MULTICAST_HOPS: 1350 case IPV6_MULTICAST_LOOP: 1351 case IPV6_JOIN_GROUP: 1352 case IPV6_LEAVE_GROUP: 1353 error = ip6_setmoptions(optname, 1354 &in6p->in6p_moptions, m); 1355 break; 1356 1357 case IPV6_PORTRANGE: 1358 optval = *mtod(m, int *); 1359 1360 switch (optval) { 1361 case IPV6_PORTRANGE_DEFAULT: 1362 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1363 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1364 break; 1365 1366 case IPV6_PORTRANGE_HIGH: 1367 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1368 in6p->in6p_flags |= IN6P_HIGHPORT; 1369 break; 1370 1371 case IPV6_PORTRANGE_LOW: 1372 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1373 in6p->in6p_flags |= IN6P_LOWPORT; 1374 break; 1375 1376 default: 1377 error = EINVAL; 1378 break; 1379 } 1380 break; 1381 1382 #ifdef IPSEC 1383 case IPV6_IPSEC_POLICY: 1384 { 1385 caddr_t req = NULL; 1386 size_t len = 0; 1387 1388 int priv = 0; 1389 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1390 priv = 0; 1391 else 1392 priv = 1; 1393 if (m) { 1394 req = mtod(m, caddr_t); 1395 len = m->m_len; 1396 } 1397 error = ipsec6_set_policy(in6p, 1398 optname, req, len, priv); 1399 } 1400 break; 1401 #endif /* IPSEC */ 1402 1403 default: 1404 error = ENOPROTOOPT; 1405 break; 1406 } 1407 if (m) 1408 (void)m_free(m); 1409 break; 1410 1411 case PRCO_GETOPT: 1412 switch (optname) { 1413 1414 case IPV6_OPTIONS: 1415 case IPV6_RETOPTS: 1416 error = ENOPROTOOPT; 1417 break; 1418 1419 case IPV6_PKTOPTIONS: 1420 if (in6p->in6p_options) { 1421 *mp = m_copym(in6p->in6p_options, 0, 1422 M_COPYALL, M_WAIT); 1423 } else { 1424 *mp = m_get(M_WAIT, MT_SOOPTS); 1425 (*mp)->m_len = 0; 1426 } 1427 break; 1428 1429 case IPV6_HOPOPTS: 1430 case IPV6_DSTOPTS: 1431 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1432 error = EPERM; 1433 break; 1434 } 1435 /* FALLTHROUGH */ 1436 case IPV6_UNICAST_HOPS: 1437 case IPV6_RECVOPTS: 1438 case IPV6_RECVRETOPTS: 1439 case IPV6_RECVDSTADDR: 1440 case IPV6_PORTRANGE: 1441 case IPV6_PKTINFO: 1442 case IPV6_HOPLIMIT: 1443 case IPV6_RTHDR: 1444 case IPV6_FAITH: 1445 case IPV6_V6ONLY: 1446 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1447 m->m_len = sizeof(int); 1448 switch (optname) { 1449 1450 case IPV6_UNICAST_HOPS: 1451 optval = in6p->in6p_hops; 1452 break; 1453 1454 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1455 1456 case IPV6_RECVOPTS: 1457 optval = OPTBIT(IN6P_RECVOPTS); 1458 break; 1459 1460 case IPV6_RECVRETOPTS: 1461 optval = OPTBIT(IN6P_RECVRETOPTS); 1462 break; 1463 1464 case IPV6_RECVDSTADDR: 1465 optval = OPTBIT(IN6P_RECVDSTADDR); 1466 break; 1467 1468 case IPV6_PORTRANGE: 1469 { 1470 int flags; 1471 flags = in6p->in6p_flags; 1472 if (flags & IN6P_HIGHPORT) 1473 optval = IPV6_PORTRANGE_HIGH; 1474 else if (flags & IN6P_LOWPORT) 1475 optval = IPV6_PORTRANGE_LOW; 1476 else 1477 optval = 0; 1478 break; 1479 } 1480 1481 case IPV6_PKTINFO: 1482 optval = OPTBIT(IN6P_PKTINFO); 1483 break; 1484 1485 case IPV6_HOPLIMIT: 1486 optval = OPTBIT(IN6P_HOPLIMIT); 1487 break; 1488 1489 case IPV6_HOPOPTS: 1490 optval = OPTBIT(IN6P_HOPOPTS); 1491 break; 1492 1493 case IPV6_DSTOPTS: 1494 optval = OPTBIT(IN6P_DSTOPTS); 1495 break; 1496 1497 case IPV6_RTHDR: 1498 optval = OPTBIT(IN6P_RTHDR); 1499 break; 1500 1501 case IPV6_FAITH: 1502 optval = OPTBIT(IN6P_FAITH); 1503 break; 1504 1505 case IPV6_V6ONLY: 1506 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1507 break; 1508 } 1509 *mtod(m, int *) = optval; 1510 break; 1511 1512 case IPV6_MULTICAST_IF: 1513 case IPV6_MULTICAST_HOPS: 1514 case IPV6_MULTICAST_LOOP: 1515 case IPV6_JOIN_GROUP: 1516 case IPV6_LEAVE_GROUP: 1517 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1518 break; 1519 1520 #ifdef IPSEC 1521 case IPV6_IPSEC_POLICY: 1522 { 1523 caddr_t req = NULL; 1524 size_t len = 0; 1525 1526 if (m) { 1527 req = mtod(m, caddr_t); 1528 len = m->m_len; 1529 } 1530 error = ipsec6_get_policy(in6p, req, len, mp); 1531 break; 1532 } 1533 #endif /* IPSEC */ 1534 1535 default: 1536 error = ENOPROTOOPT; 1537 break; 1538 } 1539 break; 1540 } 1541 } else { 1542 error = EINVAL; 1543 if (op == PRCO_SETOPT && *mp) 1544 (void)m_free(*mp); 1545 } 1546 return(error); 1547 } 1548 1549 /* 1550 * Set up IP6 options in pcb for insertion in output packets. 1551 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1552 * with destination address if source routed. 1553 */ 1554 static int 1555 ip6_pcbopts(pktopt, m, so) 1556 struct ip6_pktopts **pktopt; 1557 struct mbuf *m; 1558 struct socket *so; 1559 { 1560 struct ip6_pktopts *opt = *pktopt; 1561 int error = 0; 1562 struct proc *p = curproc; /* XXX */ 1563 int priv = 0; 1564 1565 /* turn off any old options. */ 1566 if (opt) { 1567 if (opt->ip6po_m) 1568 (void)m_free(opt->ip6po_m); 1569 } else 1570 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1571 *pktopt = 0; 1572 1573 if (!m || m->m_len == 0) { 1574 /* 1575 * Only turning off any previous options. 1576 */ 1577 if (opt) 1578 free(opt, M_IP6OPT); 1579 if (m) 1580 (void)m_free(m); 1581 return(0); 1582 } 1583 1584 /* set options specified by user. */ 1585 if (p && !suser(p->p_ucred, &p->p_acflag)) 1586 priv = 1; 1587 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1588 (void)m_free(m); 1589 return(error); 1590 } 1591 *pktopt = opt; 1592 return(0); 1593 } 1594 1595 /* 1596 * Set the IP6 multicast options in response to user setsockopt(). 1597 */ 1598 static int 1599 ip6_setmoptions(optname, im6op, m) 1600 int optname; 1601 struct ip6_moptions **im6op; 1602 struct mbuf *m; 1603 { 1604 int error = 0; 1605 u_int loop, ifindex; 1606 struct ipv6_mreq *mreq; 1607 struct ifnet *ifp; 1608 struct ip6_moptions *im6o = *im6op; 1609 struct route_in6 ro; 1610 struct sockaddr_in6 *dst; 1611 struct in6_multi_mship *imm; 1612 struct proc *p = curproc; /* XXX */ 1613 1614 if (im6o == NULL) { 1615 /* 1616 * No multicast option buffer attached to the pcb; 1617 * allocate one and initialize to default values. 1618 */ 1619 im6o = (struct ip6_moptions *) 1620 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1621 1622 if (im6o == NULL) 1623 return(ENOBUFS); 1624 *im6op = im6o; 1625 im6o->im6o_multicast_ifp = NULL; 1626 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1627 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1628 LIST_INIT(&im6o->im6o_memberships); 1629 } 1630 1631 switch (optname) { 1632 1633 case IPV6_MULTICAST_IF: 1634 /* 1635 * Select the interface for outgoing multicast packets. 1636 */ 1637 if (m == NULL || m->m_len != sizeof(u_int)) { 1638 error = EINVAL; 1639 break; 1640 } 1641 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1642 if (ifindex < 0 || if_index < ifindex) { 1643 error = ENXIO; /* XXX EINVAL? */ 1644 break; 1645 } 1646 ifp = ifindex2ifnet[ifindex]; 1647 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1648 error = EADDRNOTAVAIL; 1649 break; 1650 } 1651 im6o->im6o_multicast_ifp = ifp; 1652 break; 1653 1654 case IPV6_MULTICAST_HOPS: 1655 { 1656 /* 1657 * Set the IP6 hoplimit for outgoing multicast packets. 1658 */ 1659 int optval; 1660 if (m == NULL || m->m_len != sizeof(int)) { 1661 error = EINVAL; 1662 break; 1663 } 1664 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1665 if (optval < -1 || optval >= 256) 1666 error = EINVAL; 1667 else if (optval == -1) 1668 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1669 else 1670 im6o->im6o_multicast_hlim = optval; 1671 break; 1672 } 1673 1674 case IPV6_MULTICAST_LOOP: 1675 /* 1676 * Set the loopback flag for outgoing multicast packets. 1677 * Must be zero or one. 1678 */ 1679 if (m == NULL || m->m_len != sizeof(u_int)) { 1680 error = EINVAL; 1681 break; 1682 } 1683 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1684 if (loop > 1) { 1685 error = EINVAL; 1686 break; 1687 } 1688 im6o->im6o_multicast_loop = loop; 1689 break; 1690 1691 case IPV6_JOIN_GROUP: 1692 /* 1693 * Add a multicast group membership. 1694 * Group must be a valid IP6 multicast address. 1695 */ 1696 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1697 error = EINVAL; 1698 break; 1699 } 1700 mreq = mtod(m, struct ipv6_mreq *); 1701 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1702 /* 1703 * We use the unspecified address to specify to accept 1704 * all multicast addresses. Only super user is allowed 1705 * to do this. 1706 */ 1707 if (suser(p->p_ucred, &p->p_acflag)) 1708 { 1709 error = EACCES; 1710 break; 1711 } 1712 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1713 error = EINVAL; 1714 break; 1715 } 1716 1717 /* 1718 * If the interface is specified, validate it. 1719 */ 1720 if (mreq->ipv6mr_interface < 0 1721 || if_index < mreq->ipv6mr_interface) { 1722 error = ENXIO; /* XXX EINVAL? */ 1723 break; 1724 } 1725 /* 1726 * If no interface was explicitly specified, choose an 1727 * appropriate one according to the given multicast address. 1728 */ 1729 if (mreq->ipv6mr_interface == 0) { 1730 /* 1731 * If the multicast address is in node-local scope, 1732 * the interface should be a loopback interface. 1733 * Otherwise, look up the routing table for the 1734 * address, and choose the outgoing interface. 1735 * XXX: is it a good approach? 1736 */ 1737 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1738 ifp = &loif[0]; 1739 } else { 1740 ro.ro_rt = NULL; 1741 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1742 bzero(dst, sizeof(*dst)); 1743 dst->sin6_len = sizeof(struct sockaddr_in6); 1744 dst->sin6_family = AF_INET6; 1745 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1746 rtalloc((struct route *)&ro); 1747 if (ro.ro_rt == NULL) { 1748 error = EADDRNOTAVAIL; 1749 break; 1750 } 1751 ifp = ro.ro_rt->rt_ifp; 1752 rtfree(ro.ro_rt); 1753 } 1754 } else 1755 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1756 1757 /* 1758 * See if we found an interface, and confirm that it 1759 * supports multicast 1760 */ 1761 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1762 error = EADDRNOTAVAIL; 1763 break; 1764 } 1765 /* 1766 * Put interface index into the multicast address, 1767 * if the address has link-local scope. 1768 */ 1769 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1770 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1771 htons(mreq->ipv6mr_interface); 1772 } 1773 /* 1774 * See if the membership already exists. 1775 */ 1776 for (imm = im6o->im6o_memberships.lh_first; 1777 imm != NULL; imm = imm->i6mm_chain.le_next) 1778 if (imm->i6mm_maddr->in6m_ifp == ifp && 1779 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1780 &mreq->ipv6mr_multiaddr)) 1781 break; 1782 if (imm != NULL) { 1783 error = EADDRINUSE; 1784 break; 1785 } 1786 /* 1787 * Everything looks good; add a new record to the multicast 1788 * address list for the given interface. 1789 */ 1790 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1791 if (!imm) 1792 break; 1793 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1794 break; 1795 1796 case IPV6_LEAVE_GROUP: 1797 /* 1798 * Drop a multicast group membership. 1799 * Group must be a valid IP6 multicast address. 1800 */ 1801 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1802 error = EINVAL; 1803 break; 1804 } 1805 mreq = mtod(m, struct ipv6_mreq *); 1806 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1807 if (suser(p->p_ucred, &p->p_acflag)) 1808 { 1809 error = EACCES; 1810 break; 1811 } 1812 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1813 error = EINVAL; 1814 break; 1815 } 1816 /* 1817 * If an interface address was specified, get a pointer 1818 * to its ifnet structure. 1819 */ 1820 if (mreq->ipv6mr_interface < 0 1821 || if_index < mreq->ipv6mr_interface) { 1822 error = ENXIO; /* XXX EINVAL? */ 1823 break; 1824 } 1825 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1826 /* 1827 * Put interface index into the multicast address, 1828 * if the address has link-local scope. 1829 */ 1830 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1831 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1832 htons(mreq->ipv6mr_interface); 1833 } 1834 /* 1835 * Find the membership in the membership list. 1836 */ 1837 for (imm = im6o->im6o_memberships.lh_first; 1838 imm != NULL; imm = imm->i6mm_chain.le_next) { 1839 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 1840 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1841 &mreq->ipv6mr_multiaddr)) 1842 break; 1843 } 1844 if (imm == NULL) { 1845 /* Unable to resolve interface */ 1846 error = EADDRNOTAVAIL; 1847 break; 1848 } 1849 /* 1850 * Give up the multicast address record to which the 1851 * membership points. 1852 */ 1853 LIST_REMOVE(imm, i6mm_chain); 1854 in6_leavegroup(imm); 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 struct ip6_moptions *im6o; 1883 struct mbuf **mp; 1884 { 1885 u_int *hlim, *loop, *ifindex; 1886 1887 *mp = m_get(M_WAIT, MT_SOOPTS); 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 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 in6_leavegroup(imm); 1938 } 1939 free(im6o, M_IPMOPTS); 1940 } 1941 1942 /* 1943 * Set IPv6 outgoing packet options based on advanced API. 1944 */ 1945 int 1946 ip6_setpktoptions(control, opt, priv) 1947 struct mbuf *control; 1948 struct ip6_pktopts *opt; 1949 int priv; 1950 { 1951 struct cmsghdr *cm = 0; 1952 1953 if (control == 0 || opt == 0) 1954 return(EINVAL); 1955 1956 bzero(opt, sizeof(*opt)); 1957 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1958 1959 /* 1960 * XXX: Currently, we assume all the optional information is stored 1961 * in a single mbuf. 1962 */ 1963 if (control->m_next) 1964 return(EINVAL); 1965 1966 opt->ip6po_m = control; 1967 1968 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1969 control->m_len -= CMSG_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 /* 1992 * Check if the requested source address is indeed a 1993 * unicast address assigned to the node, and can be 1994 * used as the packet's source address. 1995 */ 1996 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 1997 struct ifaddr *ia; 1998 struct in6_ifaddr *ia6; 1999 struct sockaddr_in6 sin6; 2000 2001 bzero(&sin6, sizeof(sin6)); 2002 sin6.sin6_len = sizeof(sin6); 2003 sin6.sin6_family = AF_INET6; 2004 sin6.sin6_addr = 2005 opt->ip6po_pktinfo->ipi6_addr; 2006 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2007 if (ia == NULL || 2008 (opt->ip6po_pktinfo->ipi6_ifindex && 2009 (ia->ifa_ifp->if_index != 2010 opt->ip6po_pktinfo->ipi6_ifindex))) { 2011 return(EADDRNOTAVAIL); 2012 } 2013 ia6 = (struct in6_ifaddr *)ia; 2014 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2015 return(EADDRNOTAVAIL); 2016 } 2017 2018 /* 2019 * Check if the requested source address is 2020 * indeed a unicast address assigned to the 2021 * node. 2022 */ 2023 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2024 return(EADDRNOTAVAIL); 2025 } 2026 break; 2027 2028 case IPV6_HOPLIMIT: 2029 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2030 return(EINVAL); 2031 2032 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2033 sizeof(opt->ip6po_hlim)); 2034 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2035 return(EINVAL); 2036 break; 2037 2038 case IPV6_NEXTHOP: 2039 if (!priv) 2040 return(EPERM); 2041 2042 /* check if cmsg_len is large enough for sa_len */ 2043 if (cm->cmsg_len < sizeof(u_char) || 2044 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2045 return(EINVAL); 2046 2047 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2048 2049 break; 2050 2051 case IPV6_HOPOPTS: 2052 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2053 return(EINVAL); 2054 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2055 if (cm->cmsg_len != 2056 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2057 return(EINVAL); 2058 break; 2059 2060 case IPV6_DSTOPTS: 2061 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2062 return(EINVAL); 2063 2064 /* 2065 * If there is no routing header yet, the destination 2066 * options header should be put on the 1st part. 2067 * Otherwise, the header should be on the 2nd part. 2068 * (See RFC 2460, section 4.1) 2069 */ 2070 if (opt->ip6po_rthdr == NULL) { 2071 opt->ip6po_dest1 = 2072 (struct ip6_dest *)CMSG_DATA(cm); 2073 if (cm->cmsg_len != 2074 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) << 3)); 2075 return(EINVAL); 2076 } 2077 else { 2078 opt->ip6po_dest2 = 2079 (struct ip6_dest *)CMSG_DATA(cm); 2080 if (cm->cmsg_len != 2081 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2082 return(EINVAL); 2083 } 2084 break; 2085 2086 case IPV6_RTHDR: 2087 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2088 return(EINVAL); 2089 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2090 if (cm->cmsg_len != 2091 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2092 return(EINVAL); 2093 switch (opt->ip6po_rthdr->ip6r_type) { 2094 case IPV6_RTHDR_TYPE_0: 2095 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2096 return(EINVAL); 2097 break; 2098 default: 2099 return(EINVAL); 2100 } 2101 break; 2102 2103 default: 2104 return(ENOPROTOOPT); 2105 } 2106 } 2107 2108 return(0); 2109 } 2110 2111 /* 2112 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2113 * packet to the input queue of a specified interface. Note that this 2114 * calls the output routine of the loopback "driver", but with an interface 2115 * pointer that might NOT be &loif -- easier than replicating that code here. 2116 */ 2117 void 2118 ip6_mloopback(ifp, m, dst) 2119 struct ifnet *ifp; 2120 struct mbuf *m; 2121 struct sockaddr_in6 *dst; 2122 { 2123 struct mbuf *copym; 2124 struct ip6_hdr *ip6; 2125 2126 copym = m_copy(m, 0, M_COPYALL); 2127 if (copym == NULL) 2128 return; 2129 2130 /* 2131 * Make sure to deep-copy IPv6 header portion in case the data 2132 * is in an mbuf cluster, so that we can safely override the IPv6 2133 * header portion later. 2134 */ 2135 if ((copym->m_flags & M_EXT) != 0 || 2136 copym->m_len < sizeof(struct ip6_hdr)) { 2137 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2138 if (copym == NULL) 2139 return; 2140 } 2141 2142 #ifdef DIAGNOSTIC 2143 if (copym->m_len < sizeof(*ip6)) { 2144 m_freem(copym); 2145 return; 2146 } 2147 #endif 2148 2149 ip6 = mtod(copym, struct ip6_hdr *); 2150 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2151 ip6->ip6_src.s6_addr16[1] = 0; 2152 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2153 ip6->ip6_dst.s6_addr16[1] = 0; 2154 2155 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2156 } 2157 2158 /* 2159 * Chop IPv6 header off from the payload. 2160 */ 2161 static int 2162 ip6_splithdr(m, exthdrs) 2163 struct mbuf *m; 2164 struct ip6_exthdrs *exthdrs; 2165 { 2166 struct mbuf *mh; 2167 struct ip6_hdr *ip6; 2168 2169 ip6 = mtod(m, struct ip6_hdr *); 2170 if (m->m_len > sizeof(*ip6)) { 2171 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2172 if (mh == 0) { 2173 m_freem(m); 2174 return ENOBUFS; 2175 } 2176 M_COPY_PKTHDR(mh, m); 2177 MH_ALIGN(mh, sizeof(*ip6)); 2178 m->m_flags &= ~M_PKTHDR; 2179 m->m_len -= sizeof(*ip6); 2180 m->m_data += sizeof(*ip6); 2181 mh->m_next = m; 2182 m = mh; 2183 m->m_len = sizeof(*ip6); 2184 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2185 } 2186 exthdrs->ip6e_ip6 = m; 2187 return 0; 2188 } 2189 2190 /* 2191 * Compute IPv6 extension header length. 2192 */ 2193 int 2194 ip6_optlen(in6p) 2195 struct in6pcb *in6p; 2196 { 2197 int len; 2198 2199 if (!in6p->in6p_outputopts) 2200 return 0; 2201 2202 len = 0; 2203 #define elen(x) \ 2204 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2205 2206 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2207 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2208 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2209 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2210 return len; 2211 #undef elen 2212 } 2213
Indexes created Sun Sep 21 19:09:51 GMT 2025