ip6_output.c revision 1.77
1 /* $NetBSD: ip6_output.c,v 1.77 2004/01/24 13:02:41 darrenr 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.77 2004/01/24 13:02:41 darrenr Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pfil_hooks.h" 70 71 #include <sys/param.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/errno.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 81 #include <net/if.h> 82 #include <net/route.h> 83 #ifdef PFIL_HOOKS 84 #include <net/pfil.h> 85 #endif 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet/ip6.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/in6_pcb.h> 93 #include <netinet6/nd6.h> 94 95 #ifdef IPSEC 96 #include <netinet6/ipsec.h> 97 #include <netkey/key.h> 98 #endif /* IPSEC */ 99 100 #include "loop.h" 101 102 #include <net/net_osdep.h> 103 104 #ifdef PFIL_HOOKS 105 extern struct pfil_head inet6_pfil_hook; /* XXX */ 106 #endif 107 108 struct ip6_exthdrs { 109 struct mbuf *ip6e_ip6; 110 struct mbuf *ip6e_hbh; 111 struct mbuf *ip6e_dest1; 112 struct mbuf *ip6e_rthdr; 113 struct mbuf *ip6e_dest2; 114 }; 115 116 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 117 struct socket *)); 118 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 119 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 120 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 121 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 122 struct ip6_frag **)); 123 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 124 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 125 126 extern struct ifnet loif[NLOOP]; 127 128 /* 129 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 130 * header (with pri, len, nxt, hlim, src, dst). 131 * This function may modify ver and hlim only. 132 * The mbuf chain containing the packet will be freed. 133 * The mbuf opt, if present, will not be freed. 134 * 135 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 136 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 137 * which is rt_rmx.rmx_mtu. 138 */ 139 int 140 ip6_output(m0, opt, ro, flags, im6o, so, ifpp) 141 struct mbuf *m0; 142 struct ip6_pktopts *opt; 143 struct route_in6 *ro; 144 int flags; 145 struct ip6_moptions *im6o; 146 struct socket *so; 147 struct ifnet **ifpp; /* XXX: just for statistics */ 148 { 149 struct ip6_hdr *ip6, *mhip6; 150 struct ifnet *ifp, *origifp; 151 struct mbuf *m = m0; 152 int hlen, tlen, len, off; 153 struct route_in6 ip6route; 154 struct sockaddr_in6 *dst; 155 int error = 0; 156 u_long mtu; 157 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 158 struct ip6_exthdrs exthdrs; 159 struct in6_addr finaldst; 160 struct route_in6 *ro_pmtu = NULL; 161 int hdrsplit = 0; 162 int needipsec = 0; 163 #ifdef IPSEC 164 int needipsectun = 0; 165 struct secpolicy *sp = NULL; 166 167 ip6 = mtod(m, struct ip6_hdr *); 168 #endif /* IPSEC */ 169 170 #define MAKE_EXTHDR(hp, mp) \ 171 do { \ 172 if (hp) { \ 173 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 174 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 175 ((eh)->ip6e_len + 1) << 3); \ 176 if (error) \ 177 goto freehdrs; \ 178 } \ 179 } while (/*CONSTCOND*/ 0) 180 181 bzero(&exthdrs, sizeof(exthdrs)); 182 if (opt) { 183 /* Hop-by-Hop options header */ 184 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 185 /* Destination options header(1st part) */ 186 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 187 /* Routing header */ 188 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 189 /* Destination options header(2nd part) */ 190 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 191 } 192 193 #ifdef IPSEC 194 if ((flags & IPV6_FORWARDING) != 0) { 195 needipsec = 0; 196 goto skippolicycheck; 197 } 198 199 /* get a security policy for this packet */ 200 if (so == NULL) 201 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 202 else 203 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 204 205 if (sp == NULL) { 206 ipsec6stat.out_inval++; 207 goto freehdrs; 208 } 209 210 error = 0; 211 212 /* check policy */ 213 switch (sp->policy) { 214 case IPSEC_POLICY_DISCARD: 215 /* 216 * This packet is just discarded. 217 */ 218 ipsec6stat.out_polvio++; 219 goto freehdrs; 220 221 case IPSEC_POLICY_BYPASS: 222 case IPSEC_POLICY_NONE: 223 /* no need to do IPsec. */ 224 needipsec = 0; 225 break; 226 227 case IPSEC_POLICY_IPSEC: 228 if (sp->req == NULL) { 229 /* XXX should be panic ? */ 230 printf("ip6_output: No IPsec request specified.\n"); 231 error = EINVAL; 232 goto freehdrs; 233 } 234 needipsec = 1; 235 break; 236 237 case IPSEC_POLICY_ENTRUST: 238 default: 239 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 240 } 241 242 skippolicycheck:; 243 #endif /* IPSEC */ 244 245 /* 246 * Calculate the total length of the extension header chain. 247 * Keep the length of the unfragmentable part for fragmentation. 248 */ 249 optlen = 0; 250 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 251 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 252 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 253 unfragpartlen = optlen + sizeof(struct ip6_hdr); 254 /* NOTE: we don't add AH/ESP length here. do that later. */ 255 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 256 257 /* 258 * If we need IPsec, or there is at least one extension header, 259 * separate IP6 header from the payload. 260 */ 261 if ((needipsec || optlen) && !hdrsplit) { 262 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 263 m = NULL; 264 goto freehdrs; 265 } 266 m = exthdrs.ip6e_ip6; 267 hdrsplit++; 268 } 269 270 /* adjust pointer */ 271 ip6 = mtod(m, struct ip6_hdr *); 272 273 /* adjust mbuf packet header length */ 274 m->m_pkthdr.len += optlen; 275 plen = m->m_pkthdr.len - sizeof(*ip6); 276 277 /* If this is a jumbo payload, insert a jumbo payload option. */ 278 if (plen > IPV6_MAXPACKET) { 279 if (!hdrsplit) { 280 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 281 m = NULL; 282 goto freehdrs; 283 } 284 m = exthdrs.ip6e_ip6; 285 hdrsplit++; 286 } 287 /* adjust pointer */ 288 ip6 = mtod(m, struct ip6_hdr *); 289 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 290 goto freehdrs; 291 ip6->ip6_plen = 0; 292 } else 293 ip6->ip6_plen = htons(plen); 294 295 /* 296 * Concatenate headers and fill in next header fields. 297 * Here we have, on "m" 298 * IPv6 payload 299 * and we insert headers accordingly. Finally, we should be getting: 300 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 301 * 302 * during the header composing process, "m" points to IPv6 header. 303 * "mprev" points to an extension header prior to esp. 304 */ 305 { 306 u_char *nexthdrp = &ip6->ip6_nxt; 307 struct mbuf *mprev = m; 308 309 /* 310 * we treat dest2 specially. this makes IPsec processing 311 * much easier. 312 * 313 * result: IPv6 dest2 payload 314 * m and mprev will point to IPv6 header. 315 */ 316 if (exthdrs.ip6e_dest2) { 317 if (!hdrsplit) 318 panic("assumption failed: hdr not split"); 319 exthdrs.ip6e_dest2->m_next = m->m_next; 320 m->m_next = exthdrs.ip6e_dest2; 321 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 322 ip6->ip6_nxt = IPPROTO_DSTOPTS; 323 } 324 325 #define MAKE_CHAIN(m, mp, p, i)\ 326 do {\ 327 if (m) {\ 328 if (!hdrsplit) \ 329 panic("assumption failed: hdr not split"); \ 330 *mtod((m), u_char *) = *(p);\ 331 *(p) = (i);\ 332 p = mtod((m), u_char *);\ 333 (m)->m_next = (mp)->m_next;\ 334 (mp)->m_next = (m);\ 335 (mp) = (m);\ 336 }\ 337 } while (/*CONSTCOND*/ 0) 338 /* 339 * result: IPv6 hbh dest1 rthdr dest2 payload 340 * m will point to IPv6 header. mprev will point to the 341 * extension header prior to dest2 (rthdr in the above case). 342 */ 343 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 344 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 345 IPPROTO_DSTOPTS); 346 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 347 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 /* FALLTHROUGH */ 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_rthdr0 *rh0; 412 struct in6_addr *addr; 413 414 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 415 struct ip6_rthdr *)); 416 finaldst = ip6->ip6_dst; 417 switch (rh->ip6r_type) { 418 case IPV6_RTHDR_TYPE_0: 419 rh0 = (struct ip6_rthdr0 *)rh; 420 addr = (struct in6_addr *)(rh0 + 1); 421 ip6->ip6_dst = addr[0]; 422 bcopy(&addr[1], &addr[0], 423 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 424 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_UNSPECSRC) == 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 dst->sin6_family != AF_INET6 || 465 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 466 RTFREE(ro->ro_rt); 467 ro->ro_rt = (struct rtentry *)0; 468 } 469 if (ro->ro_rt == 0) { 470 bzero(dst, sizeof(*dst)); 471 dst->sin6_family = AF_INET6; 472 dst->sin6_len = sizeof(struct sockaddr_in6); 473 dst->sin6_addr = ip6->ip6_dst; 474 } 475 #ifdef IPSEC 476 if (needipsec && needipsectun) { 477 struct ipsec_output_state state; 478 479 /* 480 * All the extension headers will become inaccessible 481 * (since they can be encrypted). 482 * Don't panic, we need no more updates to extension headers 483 * on inner IPv6 packet (since they are now encapsulated). 484 * 485 * IPv6 [ESP|AH] IPv6 [extension headers] payload 486 */ 487 bzero(&exthdrs, sizeof(exthdrs)); 488 exthdrs.ip6e_ip6 = m; 489 490 bzero(&state, sizeof(state)); 491 state.m = m; 492 state.ro = (struct route *)ro; 493 state.dst = (struct sockaddr *)dst; 494 495 error = ipsec6_output_tunnel(&state, sp, flags); 496 497 m = state.m; 498 ro = (struct route_in6 *)state.ro; 499 dst = (struct sockaddr_in6 *)state.dst; 500 if (error) { 501 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 502 m0 = m = NULL; 503 m = NULL; 504 switch (error) { 505 case EHOSTUNREACH: 506 case ENETUNREACH: 507 case EMSGSIZE: 508 case ENOBUFS: 509 case ENOMEM: 510 break; 511 default: 512 printf("ip6_output (ipsec): error code %d\n", error); 513 /* FALLTHROUGH */ 514 case ENOENT: 515 /* don't show these error codes to the user */ 516 error = 0; 517 break; 518 } 519 goto bad; 520 } 521 522 exthdrs.ip6e_ip6 = m; 523 } 524 #endif /* IPSEC */ 525 526 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 527 /* Unicast */ 528 529 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 530 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 531 /* xxx 532 * interface selection comes here 533 * if an interface is specified from an upper layer, 534 * ifp must point it. 535 */ 536 if (ro->ro_rt == 0) { 537 /* 538 * non-bsdi always clone routes, if parent is 539 * PRF_CLONING. 540 */ 541 rtalloc((struct route *)ro); 542 } 543 if (ro->ro_rt == 0) { 544 ip6stat.ip6s_noroute++; 545 error = EHOSTUNREACH; 546 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 547 goto bad; 548 } 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 if (ro->ro_rt == 0) { 638 ip6stat.ip6s_noroute++; 639 error = EHOSTUNREACH; 640 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 641 goto bad; 642 } 643 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_randomid()); 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 struct mbuf *mlast; 888 889 MGETHDR(m, M_DONTWAIT, MT_HEADER); 890 if (!m) { 891 error = ENOBUFS; 892 ip6stat.ip6s_odropped++; 893 goto sendorfree; 894 } 895 m->m_flags = m0->m_flags & M_COPYFLAGS; 896 *mnext = m; 897 mnext = &m->m_nextpkt; 898 m->m_data += max_linkhdr; 899 mhip6 = mtod(m, struct ip6_hdr *); 900 *mhip6 = *ip6; 901 m->m_len = sizeof(*mhip6); 902 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 903 if (error) { 904 ip6stat.ip6s_odropped++; 905 goto sendorfree; 906 } 907 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 908 if (off + len >= tlen) 909 len = tlen - off; 910 else 911 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 912 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 913 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 914 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 915 error = ENOBUFS; 916 ip6stat.ip6s_odropped++; 917 goto sendorfree; 918 } 919 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 920 ; 921 mlast->m_next = m_frgpart; 922 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 923 m->m_pkthdr.rcvif = (struct ifnet *)0; 924 ip6f->ip6f_reserved = 0; 925 ip6f->ip6f_ident = id; 926 ip6f->ip6f_nxt = nextproto; 927 ip6stat.ip6s_ofragments++; 928 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 929 } 930 931 in6_ifstat_inc(ifp, ifs6_out_fragok); 932 } 933 934 /* 935 * Remove leading garbages. 936 */ 937 sendorfree: 938 m = m0->m_nextpkt; 939 m0->m_nextpkt = 0; 940 m_freem(m0); 941 for (m0 = m; m; m = m0) { 942 m0 = m->m_nextpkt; 943 m->m_nextpkt = 0; 944 if (error == 0) { 945 #ifdef IFA_STATS 946 struct in6_ifaddr *ia6; 947 ip6 = mtod(m, struct ip6_hdr *); 948 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 949 if (ia6) { 950 /* 951 * Record statistics for this interface 952 * address. 953 */ 954 ia6->ia_ifa.ifa_data.ifad_outbytes += 955 m->m_pkthdr.len; 956 } 957 #endif 958 #ifdef IPSEC 959 /* clean ipsec history once it goes out of the node */ 960 ipsec_delaux(m); 961 #endif 962 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 963 } else 964 m_freem(m); 965 } 966 967 if (error == 0) 968 ip6stat.ip6s_fragmented++; 969 970 done: 971 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 972 RTFREE(ro->ro_rt); 973 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 974 RTFREE(ro_pmtu->ro_rt); 975 } 976 977 #ifdef IPSEC 978 if (sp != NULL) 979 key_freesp(sp); 980 #endif /* IPSEC */ 981 982 return (error); 983 984 freehdrs: 985 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 986 m_freem(exthdrs.ip6e_dest1); 987 m_freem(exthdrs.ip6e_rthdr); 988 m_freem(exthdrs.ip6e_dest2); 989 /* FALLTHROUGH */ 990 bad: 991 m_freem(m); 992 goto done; 993 } 994 995 static int 996 ip6_copyexthdr(mp, hdr, hlen) 997 struct mbuf **mp; 998 caddr_t hdr; 999 int hlen; 1000 { 1001 struct mbuf *m; 1002 1003 if (hlen > MCLBYTES) 1004 return (ENOBUFS); /* XXX */ 1005 1006 MGET(m, M_DONTWAIT, MT_DATA); 1007 if (!m) 1008 return (ENOBUFS); 1009 1010 if (hlen > MLEN) { 1011 MCLGET(m, M_DONTWAIT); 1012 if ((m->m_flags & M_EXT) == 0) { 1013 m_free(m); 1014 return (ENOBUFS); 1015 } 1016 } 1017 m->m_len = hlen; 1018 if (hdr) 1019 bcopy(hdr, mtod(m, caddr_t), hlen); 1020 1021 *mp = m; 1022 return (0); 1023 } 1024 1025 /* 1026 * Insert jumbo payload option. 1027 */ 1028 static int 1029 ip6_insert_jumboopt(exthdrs, plen) 1030 struct ip6_exthdrs *exthdrs; 1031 u_int32_t plen; 1032 { 1033 struct mbuf *mopt; 1034 u_int8_t *optbuf; 1035 u_int32_t v; 1036 1037 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1038 1039 /* 1040 * If there is no hop-by-hop options header, allocate new one. 1041 * If there is one but it doesn't have enough space to store the 1042 * jumbo payload option, allocate a cluster to store the whole options. 1043 * Otherwise, use it to store the options. 1044 */ 1045 if (exthdrs->ip6e_hbh == 0) { 1046 MGET(mopt, M_DONTWAIT, MT_DATA); 1047 if (mopt == 0) 1048 return (ENOBUFS); 1049 mopt->m_len = JUMBOOPTLEN; 1050 optbuf = mtod(mopt, u_int8_t *); 1051 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1052 exthdrs->ip6e_hbh = mopt; 1053 } else { 1054 struct ip6_hbh *hbh; 1055 1056 mopt = exthdrs->ip6e_hbh; 1057 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1058 /* 1059 * XXX assumption: 1060 * - exthdrs->ip6e_hbh is not referenced from places 1061 * other than exthdrs. 1062 * - exthdrs->ip6e_hbh is not an mbuf chain. 1063 */ 1064 int oldoptlen = mopt->m_len; 1065 struct mbuf *n; 1066 1067 /* 1068 * XXX: give up if the whole (new) hbh header does 1069 * not fit even in an mbuf cluster. 1070 */ 1071 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1072 return (ENOBUFS); 1073 1074 /* 1075 * As a consequence, we must always prepare a cluster 1076 * at this point. 1077 */ 1078 MGET(n, M_DONTWAIT, MT_DATA); 1079 if (n) { 1080 MCLGET(n, M_DONTWAIT); 1081 if ((n->m_flags & M_EXT) == 0) { 1082 m_freem(n); 1083 n = NULL; 1084 } 1085 } 1086 if (!n) 1087 return (ENOBUFS); 1088 n->m_len = oldoptlen + JUMBOOPTLEN; 1089 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1090 oldoptlen); 1091 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1092 m_freem(mopt); 1093 mopt = exthdrs->ip6e_hbh = n; 1094 } else { 1095 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1096 mopt->m_len += JUMBOOPTLEN; 1097 } 1098 optbuf[0] = IP6OPT_PADN; 1099 optbuf[1] = 0; 1100 1101 /* 1102 * Adjust the header length according to the pad and 1103 * the jumbo payload option. 1104 */ 1105 hbh = mtod(mopt, struct ip6_hbh *); 1106 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1107 } 1108 1109 /* fill in the option. */ 1110 optbuf[2] = IP6OPT_JUMBO; 1111 optbuf[3] = 4; 1112 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1113 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1114 1115 /* finally, adjust the packet header length */ 1116 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1117 1118 return (0); 1119 #undef JUMBOOPTLEN 1120 } 1121 1122 /* 1123 * Insert fragment header and copy unfragmentable header portions. 1124 */ 1125 static int 1126 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1127 struct mbuf *m0, *m; 1128 int hlen; 1129 struct ip6_frag **frghdrp; 1130 { 1131 struct mbuf *n, *mlast; 1132 1133 if (hlen > sizeof(struct ip6_hdr)) { 1134 n = m_copym(m0, sizeof(struct ip6_hdr), 1135 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1136 if (n == 0) 1137 return (ENOBUFS); 1138 m->m_next = n; 1139 } else 1140 n = m; 1141 1142 /* Search for the last mbuf of unfragmentable part. */ 1143 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1144 ; 1145 1146 if ((mlast->m_flags & M_EXT) == 0 && 1147 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1148 /* use the trailing space of the last mbuf for the fragment hdr */ 1149 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1150 mlast->m_len); 1151 mlast->m_len += sizeof(struct ip6_frag); 1152 m->m_pkthdr.len += sizeof(struct ip6_frag); 1153 } else { 1154 /* allocate a new mbuf for the fragment header */ 1155 struct mbuf *mfrg; 1156 1157 MGET(mfrg, M_DONTWAIT, MT_DATA); 1158 if (mfrg == 0) 1159 return (ENOBUFS); 1160 mfrg->m_len = sizeof(struct ip6_frag); 1161 *frghdrp = mtod(mfrg, struct ip6_frag *); 1162 mlast->m_next = mfrg; 1163 } 1164 1165 return (0); 1166 } 1167 1168 int 1169 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup) 1170 struct route_in6 *ro_pmtu, *ro; 1171 struct ifnet *ifp; 1172 struct in6_addr *dst; 1173 u_long *mtup; 1174 { 1175 u_int32_t mtu = 0; 1176 int error = 0; 1177 1178 if (ro_pmtu != ro) { 1179 /* The first hop and the final destination may differ. */ 1180 struct sockaddr_in6 *sa6_dst = 1181 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1182 if (ro_pmtu->ro_rt && 1183 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1184 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1185 RTFREE(ro_pmtu->ro_rt); 1186 ro_pmtu->ro_rt = (struct rtentry *)0; 1187 } 1188 if (ro_pmtu->ro_rt == 0) { 1189 bzero(sa6_dst, sizeof(*sa6_dst)); 1190 sa6_dst->sin6_family = AF_INET6; 1191 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1192 sa6_dst->sin6_addr = *dst; 1193 1194 rtalloc((struct route *)ro_pmtu); 1195 } 1196 } 1197 if (ro_pmtu->ro_rt) { 1198 u_int32_t ifmtu; 1199 1200 if (ifp == NULL) 1201 ifp = ro_pmtu->ro_rt->rt_ifp; 1202 ifmtu = IN6_LINKMTU(ifp); 1203 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1204 if (mtu == 0) 1205 mtu = ifmtu; 1206 else if (mtu > ifmtu) { 1207 /* 1208 * The MTU on the route is larger than the MTU on 1209 * the interface! This shouldn't happen, unless the 1210 * MTU of the interface has been changed after the 1211 * interface was brought up. Change the MTU in the 1212 * route to match the interface MTU (as long as the 1213 * field isn't locked). 1214 * 1215 * if MTU on the route is 0, we need to fix the MTU. 1216 * this case happens with path MTU discovery timeouts. 1217 */ 1218 mtu = ifmtu; 1219 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1220 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1221 } 1222 } else if (ifp) { 1223 mtu = IN6_LINKMTU(ifp); 1224 } else 1225 error = EHOSTUNREACH; /* XXX */ 1226 1227 *mtup = mtu; 1228 return (error); 1229 } 1230 1231 /* 1232 * IP6 socket option processing. 1233 */ 1234 int 1235 ip6_ctloutput(op, so, level, optname, mp) 1236 int op; 1237 struct socket *so; 1238 int level, optname; 1239 struct mbuf **mp; 1240 { 1241 struct in6pcb *in6p = sotoin6pcb(so); 1242 struct mbuf *m = *mp; 1243 int optval = 0; 1244 int error = 0; 1245 struct proc *p = curproc; /* XXX */ 1246 1247 if (level == IPPROTO_IPV6) { 1248 switch (op) { 1249 case PRCO_SETOPT: 1250 switch (optname) { 1251 case IPV6_PKTOPTIONS: 1252 /* m is freed in ip6_pcbopts */ 1253 return (ip6_pcbopts(&in6p->in6p_outputopts, 1254 m, so)); 1255 case IPV6_HOPOPTS: 1256 case IPV6_DSTOPTS: 1257 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1258 error = EPERM; 1259 break; 1260 } 1261 /* FALLTHROUGH */ 1262 case IPV6_UNICAST_HOPS: 1263 case IPV6_RECVOPTS: 1264 case IPV6_RECVRETOPTS: 1265 case IPV6_RECVDSTADDR: 1266 case IPV6_PKTINFO: 1267 case IPV6_HOPLIMIT: 1268 case IPV6_RTHDR: 1269 case IPV6_FAITH: 1270 case IPV6_V6ONLY: 1271 if (!m || m->m_len != sizeof(int)) { 1272 error = EINVAL; 1273 break; 1274 } 1275 optval = *mtod(m, int *); 1276 switch (optname) { 1277 1278 case IPV6_UNICAST_HOPS: 1279 if (optval < -1 || optval >= 256) 1280 error = EINVAL; 1281 else { 1282 /* -1 = kernel default */ 1283 in6p->in6p_hops = optval; 1284 } 1285 break; 1286 #define OPTSET(bit) \ 1287 do { \ 1288 if (optval) \ 1289 in6p->in6p_flags |= (bit); \ 1290 else \ 1291 in6p->in6p_flags &= ~(bit); \ 1292 } while (/*CONSTCOND*/ 0) 1293 1294 case IPV6_RECVOPTS: 1295 OPTSET(IN6P_RECVOPTS); 1296 break; 1297 1298 case IPV6_RECVRETOPTS: 1299 OPTSET(IN6P_RECVRETOPTS); 1300 break; 1301 1302 case IPV6_RECVDSTADDR: 1303 OPTSET(IN6P_RECVDSTADDR); 1304 break; 1305 1306 case IPV6_PKTINFO: 1307 OPTSET(IN6P_PKTINFO); 1308 break; 1309 1310 case IPV6_HOPLIMIT: 1311 OPTSET(IN6P_HOPLIMIT); 1312 break; 1313 1314 case IPV6_HOPOPTS: 1315 OPTSET(IN6P_HOPOPTS); 1316 break; 1317 1318 case IPV6_DSTOPTS: 1319 OPTSET(IN6P_DSTOPTS); 1320 break; 1321 1322 case IPV6_RTHDR: 1323 OPTSET(IN6P_RTHDR); 1324 break; 1325 1326 case IPV6_FAITH: 1327 OPTSET(IN6P_FAITH); 1328 break; 1329 1330 case IPV6_V6ONLY: 1331 /* 1332 * make setsockopt(IPV6_V6ONLY) 1333 * available only prior to bind(2). 1334 * see ipng mailing list, Jun 22 2001. 1335 */ 1336 if (in6p->in6p_lport || 1337 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1338 error = EINVAL; 1339 break; 1340 } 1341 #ifdef INET6_BINDV6ONLY 1342 if (!optval) 1343 error = EINVAL; 1344 #else 1345 OPTSET(IN6P_IPV6_V6ONLY); 1346 #endif 1347 break; 1348 } 1349 break; 1350 #undef OPTSET 1351 1352 case IPV6_MULTICAST_IF: 1353 case IPV6_MULTICAST_HOPS: 1354 case IPV6_MULTICAST_LOOP: 1355 case IPV6_JOIN_GROUP: 1356 case IPV6_LEAVE_GROUP: 1357 error = ip6_setmoptions(optname, 1358 &in6p->in6p_moptions, m); 1359 break; 1360 1361 case IPV6_PORTRANGE: 1362 optval = *mtod(m, int *); 1363 1364 switch (optval) { 1365 case IPV6_PORTRANGE_DEFAULT: 1366 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1367 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1368 break; 1369 1370 case IPV6_PORTRANGE_HIGH: 1371 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1372 in6p->in6p_flags |= IN6P_HIGHPORT; 1373 break; 1374 1375 case IPV6_PORTRANGE_LOW: 1376 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1377 in6p->in6p_flags |= IN6P_LOWPORT; 1378 break; 1379 1380 default: 1381 error = EINVAL; 1382 break; 1383 } 1384 break; 1385 1386 #ifdef IPSEC 1387 case IPV6_IPSEC_POLICY: 1388 { 1389 caddr_t req = NULL; 1390 size_t len = 0; 1391 1392 int priv = 0; 1393 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1394 priv = 0; 1395 else 1396 priv = 1; 1397 if (m) { 1398 req = mtod(m, caddr_t); 1399 len = m->m_len; 1400 } 1401 error = ipsec6_set_policy(in6p, 1402 optname, req, len, priv); 1403 } 1404 break; 1405 #endif /* IPSEC */ 1406 1407 default: 1408 error = ENOPROTOOPT; 1409 break; 1410 } 1411 if (m) 1412 (void)m_free(m); 1413 break; 1414 1415 case PRCO_GETOPT: 1416 switch (optname) { 1417 1418 case IPV6_OPTIONS: 1419 case IPV6_RETOPTS: 1420 error = ENOPROTOOPT; 1421 break; 1422 1423 case IPV6_PKTOPTIONS: 1424 if (in6p->in6p_options) { 1425 *mp = m_copym(in6p->in6p_options, 0, 1426 M_COPYALL, M_WAIT); 1427 } else { 1428 *mp = m_get(M_WAIT, MT_SOOPTS); 1429 (*mp)->m_len = 0; 1430 } 1431 break; 1432 1433 case IPV6_HOPOPTS: 1434 case IPV6_DSTOPTS: 1435 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1436 error = EPERM; 1437 break; 1438 } 1439 /* FALLTHROUGH */ 1440 case IPV6_UNICAST_HOPS: 1441 case IPV6_RECVOPTS: 1442 case IPV6_RECVRETOPTS: 1443 case IPV6_RECVDSTADDR: 1444 case IPV6_PORTRANGE: 1445 case IPV6_PKTINFO: 1446 case IPV6_HOPLIMIT: 1447 case IPV6_RTHDR: 1448 case IPV6_FAITH: 1449 case IPV6_V6ONLY: 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_FAITH: 1506 optval = OPTBIT(IN6P_FAITH); 1507 break; 1508 1509 case IPV6_V6ONLY: 1510 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1511 break; 1512 } 1513 *mtod(m, int *) = optval; 1514 break; 1515 1516 case IPV6_MULTICAST_IF: 1517 case IPV6_MULTICAST_HOPS: 1518 case IPV6_MULTICAST_LOOP: 1519 case IPV6_JOIN_GROUP: 1520 case IPV6_LEAVE_GROUP: 1521 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1522 break; 1523 1524 #ifdef IPSEC 1525 case IPV6_IPSEC_POLICY: 1526 { 1527 caddr_t req = NULL; 1528 size_t len = 0; 1529 1530 if (m) { 1531 req = mtod(m, caddr_t); 1532 len = m->m_len; 1533 } 1534 error = ipsec6_get_policy(in6p, req, len, mp); 1535 break; 1536 } 1537 #endif /* IPSEC */ 1538 1539 default: 1540 error = ENOPROTOOPT; 1541 break; 1542 } 1543 break; 1544 } 1545 } else { 1546 error = EINVAL; 1547 if (op == PRCO_SETOPT && *mp) 1548 (void)m_free(*mp); 1549 } 1550 return (error); 1551 } 1552 1553 int 1554 ip6_raw_ctloutput(op, so, level, optname, mp) 1555 int op; 1556 struct socket *so; 1557 int level, optname; 1558 struct mbuf **mp; 1559 { 1560 int error = 0, optval, optlen; 1561 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1562 struct in6pcb *in6p = sotoin6pcb(so); 1563 struct mbuf *m = *mp; 1564 1565 optlen = m ? m->m_len : 0; 1566 1567 if (level != IPPROTO_IPV6) { 1568 if (op == PRCO_SETOPT && *mp) 1569 (void)m_free(*mp); 1570 return (EINVAL); 1571 } 1572 1573 switch (optname) { 1574 case IPV6_CHECKSUM: 1575 /* 1576 * For ICMPv6 sockets, no modification allowed for checksum 1577 * offset, permit "no change" values to help existing apps. 1578 * 1579 * XXX 2292bis says: "An attempt to set IPV6_CHECKSUM 1580 * for an ICMPv6 socket will fail." 1581 * The current behavior does not meet 2292bis. 1582 */ 1583 switch (op) { 1584 case PRCO_SETOPT: 1585 if (optlen != sizeof(int)) { 1586 error = EINVAL; 1587 break; 1588 } 1589 optval = *mtod(m, int *); 1590 if ((optval % 2) != 0) { 1591 /* the API assumes even offset values */ 1592 error = EINVAL; 1593 } else if (so->so_proto->pr_protocol == 1594 IPPROTO_ICMPV6) { 1595 if (optval != icmp6off) 1596 error = EINVAL; 1597 } else 1598 in6p->in6p_cksum = optval; 1599 break; 1600 1601 case PRCO_GETOPT: 1602 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1603 optval = icmp6off; 1604 else 1605 optval = in6p->in6p_cksum; 1606 1607 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1608 m->m_len = sizeof(int); 1609 *mtod(m, int *) = optval; 1610 break; 1611 1612 default: 1613 error = EINVAL; 1614 break; 1615 } 1616 break; 1617 1618 default: 1619 error = ENOPROTOOPT; 1620 break; 1621 } 1622 1623 if (op == PRCO_SETOPT && m) 1624 (void)m_free(m); 1625 1626 return (error); 1627 } 1628 1629 /* 1630 * Set up IP6 options in pcb for insertion in output packets. 1631 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1632 * with destination address if source routed. 1633 */ 1634 static int 1635 ip6_pcbopts(pktopt, m, so) 1636 struct ip6_pktopts **pktopt; 1637 struct mbuf *m; 1638 struct socket *so; 1639 { 1640 struct ip6_pktopts *opt = *pktopt; 1641 int error = 0; 1642 struct proc *p = curproc; /* XXX */ 1643 int priv = 0; 1644 1645 /* turn off any old options. */ 1646 if (opt) { 1647 if (opt->ip6po_m) 1648 (void)m_free(opt->ip6po_m); 1649 } else 1650 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1651 *pktopt = 0; 1652 1653 if (!m || m->m_len == 0) { 1654 /* 1655 * Only turning off any previous options. 1656 */ 1657 free(opt, M_IP6OPT); 1658 if (m) 1659 (void)m_free(m); 1660 return (0); 1661 } 1662 1663 /* set options specified by user. */ 1664 if (p && !suser(p->p_ucred, &p->p_acflag)) 1665 priv = 1; 1666 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1667 (void)m_free(m); 1668 free(opt, M_IP6OPT); 1669 return (error); 1670 } 1671 *pktopt = opt; 1672 return (0); 1673 } 1674 1675 /* 1676 * Set the IP6 multicast options in response to user setsockopt(). 1677 */ 1678 static int 1679 ip6_setmoptions(optname, im6op, m) 1680 int optname; 1681 struct ip6_moptions **im6op; 1682 struct mbuf *m; 1683 { 1684 int error = 0; 1685 u_int loop, ifindex; 1686 struct ipv6_mreq *mreq; 1687 struct ifnet *ifp; 1688 struct ip6_moptions *im6o = *im6op; 1689 struct route_in6 ro; 1690 struct sockaddr_in6 *dst; 1691 struct in6_multi_mship *imm; 1692 struct proc *p = curproc; /* XXX */ 1693 1694 if (im6o == NULL) { 1695 /* 1696 * No multicast option buffer attached to the pcb; 1697 * allocate one and initialize to default values. 1698 */ 1699 im6o = (struct ip6_moptions *) 1700 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1701 1702 if (im6o == NULL) 1703 return (ENOBUFS); 1704 *im6op = im6o; 1705 im6o->im6o_multicast_ifp = NULL; 1706 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1707 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1708 LIST_INIT(&im6o->im6o_memberships); 1709 } 1710 1711 switch (optname) { 1712 1713 case IPV6_MULTICAST_IF: 1714 /* 1715 * Select the interface for outgoing multicast packets. 1716 */ 1717 if (m == NULL || m->m_len != sizeof(u_int)) { 1718 error = EINVAL; 1719 break; 1720 } 1721 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1722 if (ifindex < 0 || if_indexlim <= ifindex || 1723 !ifindex2ifnet[ifindex]) { 1724 error = ENXIO; /* XXX EINVAL? */ 1725 break; 1726 } 1727 ifp = ifindex2ifnet[ifindex]; 1728 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1729 error = EADDRNOTAVAIL; 1730 break; 1731 } 1732 im6o->im6o_multicast_ifp = ifp; 1733 break; 1734 1735 case IPV6_MULTICAST_HOPS: 1736 { 1737 /* 1738 * Set the IP6 hoplimit for outgoing multicast packets. 1739 */ 1740 int optval; 1741 if (m == NULL || m->m_len != sizeof(int)) { 1742 error = EINVAL; 1743 break; 1744 } 1745 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1746 if (optval < -1 || optval >= 256) 1747 error = EINVAL; 1748 else if (optval == -1) 1749 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1750 else 1751 im6o->im6o_multicast_hlim = optval; 1752 break; 1753 } 1754 1755 case IPV6_MULTICAST_LOOP: 1756 /* 1757 * Set the loopback flag for outgoing multicast packets. 1758 * Must be zero or one. 1759 */ 1760 if (m == NULL || m->m_len != sizeof(u_int)) { 1761 error = EINVAL; 1762 break; 1763 } 1764 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1765 if (loop > 1) { 1766 error = EINVAL; 1767 break; 1768 } 1769 im6o->im6o_multicast_loop = loop; 1770 break; 1771 1772 case IPV6_JOIN_GROUP: 1773 /* 1774 * Add a multicast group membership. 1775 * Group must be a valid IP6 multicast address. 1776 */ 1777 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1778 error = EINVAL; 1779 break; 1780 } 1781 mreq = mtod(m, struct ipv6_mreq *); 1782 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1783 /* 1784 * We use the unspecified address to specify to accept 1785 * all multicast addresses. Only super user is allowed 1786 * to do this. 1787 */ 1788 if (suser(p->p_ucred, &p->p_acflag)) 1789 { 1790 error = EACCES; 1791 break; 1792 } 1793 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1794 error = EINVAL; 1795 break; 1796 } 1797 1798 /* 1799 * If the interface is specified, validate it. 1800 */ 1801 if (mreq->ipv6mr_interface < 0 || 1802 if_indexlim <= mreq->ipv6mr_interface || 1803 !ifindex2ifnet[mreq->ipv6mr_interface]) { 1804 error = ENXIO; /* XXX EINVAL? */ 1805 break; 1806 } 1807 /* 1808 * If no interface was explicitly specified, choose an 1809 * appropriate one according to the given multicast address. 1810 */ 1811 if (mreq->ipv6mr_interface == 0) { 1812 /* 1813 * If the multicast address is in node-local scope, 1814 * the interface should be a loopback interface. 1815 * Otherwise, look up the routing table for the 1816 * address, and choose the outgoing interface. 1817 * XXX: is it a good approach? 1818 */ 1819 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1820 ifp = &loif[0]; 1821 } else { 1822 ro.ro_rt = NULL; 1823 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1824 bzero(dst, sizeof(*dst)); 1825 dst->sin6_len = sizeof(struct sockaddr_in6); 1826 dst->sin6_family = AF_INET6; 1827 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1828 rtalloc((struct route *)&ro); 1829 if (ro.ro_rt == NULL) { 1830 error = EADDRNOTAVAIL; 1831 break; 1832 } 1833 ifp = ro.ro_rt->rt_ifp; 1834 rtfree(ro.ro_rt); 1835 } 1836 } else 1837 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1838 1839 /* 1840 * See if we found an interface, and confirm that it 1841 * supports multicast 1842 */ 1843 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1844 error = EADDRNOTAVAIL; 1845 break; 1846 } 1847 /* 1848 * Put interface index into the multicast address, 1849 * if the address has link-local scope. 1850 */ 1851 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1852 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1853 htons(ifp->if_index); 1854 } 1855 /* 1856 * See if the membership already exists. 1857 */ 1858 for (imm = im6o->im6o_memberships.lh_first; 1859 imm != NULL; imm = imm->i6mm_chain.le_next) 1860 if (imm->i6mm_maddr->in6m_ifp == ifp && 1861 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1862 &mreq->ipv6mr_multiaddr)) 1863 break; 1864 if (imm != NULL) { 1865 error = EADDRINUSE; 1866 break; 1867 } 1868 /* 1869 * Everything looks good; add a new record to the multicast 1870 * address list for the given interface. 1871 */ 1872 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1873 if (!imm) 1874 break; 1875 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1876 break; 1877 1878 case IPV6_LEAVE_GROUP: 1879 /* 1880 * Drop a multicast group membership. 1881 * Group must be a valid IP6 multicast address. 1882 */ 1883 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1884 error = EINVAL; 1885 break; 1886 } 1887 mreq = mtod(m, struct ipv6_mreq *); 1888 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1889 if (suser(p->p_ucred, &p->p_acflag)) 1890 { 1891 error = EACCES; 1892 break; 1893 } 1894 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1895 error = EINVAL; 1896 break; 1897 } 1898 /* 1899 * If an interface address was specified, get a pointer 1900 * to its ifnet structure. 1901 */ 1902 if (mreq->ipv6mr_interface < 0 || 1903 if_indexlim <= mreq->ipv6mr_interface || 1904 !ifindex2ifnet[mreq->ipv6mr_interface]) { 1905 error = ENXIO; /* XXX EINVAL? */ 1906 break; 1907 } 1908 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1909 /* 1910 * Put interface index into the multicast address, 1911 * if the address has link-local scope. 1912 */ 1913 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1914 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1915 htons(mreq->ipv6mr_interface); 1916 } 1917 /* 1918 * Find the membership in the membership list. 1919 */ 1920 for (imm = im6o->im6o_memberships.lh_first; 1921 imm != NULL; imm = imm->i6mm_chain.le_next) { 1922 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 1923 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1924 &mreq->ipv6mr_multiaddr)) 1925 break; 1926 } 1927 if (imm == NULL) { 1928 /* Unable to resolve interface */ 1929 error = EADDRNOTAVAIL; 1930 break; 1931 } 1932 /* 1933 * Give up the multicast address record to which the 1934 * membership points. 1935 */ 1936 LIST_REMOVE(imm, i6mm_chain); 1937 in6_leavegroup(imm); 1938 break; 1939 1940 default: 1941 error = EOPNOTSUPP; 1942 break; 1943 } 1944 1945 /* 1946 * If all options have default values, no need to keep the mbuf. 1947 */ 1948 if (im6o->im6o_multicast_ifp == NULL && 1949 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1950 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1951 im6o->im6o_memberships.lh_first == NULL) { 1952 free(*im6op, M_IPMOPTS); 1953 *im6op = NULL; 1954 } 1955 1956 return (error); 1957 } 1958 1959 /* 1960 * Return the IP6 multicast options in response to user getsockopt(). 1961 */ 1962 static int 1963 ip6_getmoptions(optname, im6o, mp) 1964 int optname; 1965 struct ip6_moptions *im6o; 1966 struct mbuf **mp; 1967 { 1968 u_int *hlim, *loop, *ifindex; 1969 1970 *mp = m_get(M_WAIT, MT_SOOPTS); 1971 1972 switch (optname) { 1973 1974 case IPV6_MULTICAST_IF: 1975 ifindex = mtod(*mp, u_int *); 1976 (*mp)->m_len = sizeof(u_int); 1977 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1978 *ifindex = 0; 1979 else 1980 *ifindex = im6o->im6o_multicast_ifp->if_index; 1981 return (0); 1982 1983 case IPV6_MULTICAST_HOPS: 1984 hlim = mtod(*mp, u_int *); 1985 (*mp)->m_len = sizeof(u_int); 1986 if (im6o == NULL) 1987 *hlim = ip6_defmcasthlim; 1988 else 1989 *hlim = im6o->im6o_multicast_hlim; 1990 return (0); 1991 1992 case IPV6_MULTICAST_LOOP: 1993 loop = mtod(*mp, u_int *); 1994 (*mp)->m_len = sizeof(u_int); 1995 if (im6o == NULL) 1996 *loop = ip6_defmcasthlim; 1997 else 1998 *loop = im6o->im6o_multicast_loop; 1999 return (0); 2000 2001 default: 2002 return (EOPNOTSUPP); 2003 } 2004 } 2005 2006 /* 2007 * Discard the IP6 multicast options. 2008 */ 2009 void 2010 ip6_freemoptions(im6o) 2011 struct ip6_moptions *im6o; 2012 { 2013 struct in6_multi_mship *imm; 2014 2015 if (im6o == NULL) 2016 return; 2017 2018 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2019 LIST_REMOVE(imm, i6mm_chain); 2020 in6_leavegroup(imm); 2021 } 2022 free(im6o, M_IPMOPTS); 2023 } 2024 2025 /* 2026 * Set IPv6 outgoing packet options based on advanced API. 2027 */ 2028 int 2029 ip6_setpktoptions(control, opt, priv) 2030 struct mbuf *control; 2031 struct ip6_pktopts *opt; 2032 int priv; 2033 { 2034 struct cmsghdr *cm = 0; 2035 2036 if (control == 0 || opt == 0) 2037 return (EINVAL); 2038 2039 bzero(opt, sizeof(*opt)); 2040 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2041 2042 /* 2043 * XXX: Currently, we assume all the optional information is stored 2044 * in a single mbuf. 2045 */ 2046 if (control->m_next) 2047 return (EINVAL); 2048 2049 opt->ip6po_m = control; 2050 2051 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2052 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2053 cm = mtod(control, struct cmsghdr *); 2054 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2055 return (EINVAL); 2056 if (cm->cmsg_level != IPPROTO_IPV6) 2057 continue; 2058 2059 switch (cm->cmsg_type) { 2060 case IPV6_PKTINFO: 2061 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2062 return (EINVAL); 2063 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2064 if (opt->ip6po_pktinfo->ipi6_ifindex && 2065 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2066 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2067 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2068 2069 if (opt->ip6po_pktinfo->ipi6_ifindex >= if_indexlim || 2070 opt->ip6po_pktinfo->ipi6_ifindex < 0) 2071 return (ENXIO); 2072 if (opt->ip6po_pktinfo->ipi6_ifindex > 0 && 2073 !ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]) 2074 return (ENXIO); 2075 2076 /* 2077 * Check if the requested source address is indeed a 2078 * unicast address assigned to the node, and can be 2079 * used as the packet's source address. 2080 */ 2081 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2082 struct ifaddr *ia; 2083 struct in6_ifaddr *ia6; 2084 struct sockaddr_in6 sin6; 2085 2086 bzero(&sin6, sizeof(sin6)); 2087 sin6.sin6_len = sizeof(sin6); 2088 sin6.sin6_family = AF_INET6; 2089 sin6.sin6_addr = 2090 opt->ip6po_pktinfo->ipi6_addr; 2091 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2092 if (ia == NULL || 2093 (opt->ip6po_pktinfo->ipi6_ifindex && 2094 (ia->ifa_ifp->if_index != 2095 opt->ip6po_pktinfo->ipi6_ifindex))) { 2096 return (EADDRNOTAVAIL); 2097 } 2098 ia6 = (struct in6_ifaddr *)ia; 2099 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2100 return (EADDRNOTAVAIL); 2101 } 2102 2103 /* 2104 * Check if the requested source address is 2105 * indeed a unicast address assigned to the 2106 * node. 2107 */ 2108 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2109 return (EADDRNOTAVAIL); 2110 } 2111 break; 2112 2113 case IPV6_HOPLIMIT: 2114 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2115 return (EINVAL); 2116 else { 2117 int t; 2118 2119 bcopy(CMSG_DATA(cm), &t, sizeof(t)); 2120 if (t < -1 || t > 255) 2121 return (EINVAL); 2122 opt->ip6po_hlim = t; 2123 } 2124 break; 2125 2126 case IPV6_NEXTHOP: 2127 if (!priv) 2128 return (EPERM); 2129 2130 /* check if cmsg_len is large enough for sa_len */ 2131 if (cm->cmsg_len < sizeof(u_char) || 2132 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2133 return (EINVAL); 2134 2135 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2136 2137 break; 2138 2139 case IPV6_HOPOPTS: 2140 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2141 return (EINVAL); 2142 else { 2143 struct ip6_hbh *t; 2144 2145 t = (struct ip6_hbh *)CMSG_DATA(cm); 2146 if (cm->cmsg_len != 2147 CMSG_LEN((t->ip6h_len + 1) << 3)) 2148 return (EINVAL); 2149 opt->ip6po_hbh = t; 2150 } 2151 break; 2152 2153 case IPV6_DSTOPTS: 2154 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2155 return (EINVAL); 2156 2157 /* 2158 * If there is no routing header yet, the destination 2159 * options header should be put on the 1st part. 2160 * Otherwise, the header should be on the 2nd part. 2161 * (See RFC 2460, section 4.1) 2162 */ 2163 if (opt->ip6po_rthdr == NULL) { 2164 struct ip6_dest *t; 2165 2166 t = (struct ip6_dest *)CMSG_DATA(cm); 2167 if (cm->cmsg_len != 2168 CMSG_LEN((t->ip6d_len + 1) << 3)); 2169 return (EINVAL); 2170 opt->ip6po_dest1 = t; 2171 } 2172 else { 2173 struct ip6_dest *t; 2174 2175 t = (struct ip6_dest *)CMSG_DATA(cm); 2176 if (cm->cmsg_len != 2177 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2178 return (EINVAL); 2179 opt->ip6po_dest2 = t; 2180 } 2181 break; 2182 2183 case IPV6_RTHDR: 2184 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2185 return (EINVAL); 2186 else { 2187 struct ip6_rthdr *t; 2188 2189 t = (struct ip6_rthdr *)CMSG_DATA(cm); 2190 if (cm->cmsg_len != 2191 CMSG_LEN((t->ip6r_len + 1) << 3)) 2192 return (EINVAL); 2193 switch (t->ip6r_type) { 2194 case IPV6_RTHDR_TYPE_0: 2195 if (t->ip6r_segleft == 0) 2196 return (EINVAL); 2197 break; 2198 default: 2199 return (EINVAL); 2200 } 2201 opt->ip6po_rthdr = t; 2202 } 2203 break; 2204 2205 default: 2206 return (ENOPROTOOPT); 2207 } 2208 } 2209 2210 return (0); 2211 } 2212 2213 /* 2214 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2215 * packet to the input queue of a specified interface. Note that this 2216 * calls the output routine of the loopback "driver", but with an interface 2217 * pointer that might NOT be &loif -- easier than replicating that code here. 2218 */ 2219 void 2220 ip6_mloopback(ifp, m, dst) 2221 struct ifnet *ifp; 2222 struct mbuf *m; 2223 struct sockaddr_in6 *dst; 2224 { 2225 struct mbuf *copym; 2226 struct ip6_hdr *ip6; 2227 2228 copym = m_copy(m, 0, M_COPYALL); 2229 if (copym == NULL) 2230 return; 2231 2232 /* 2233 * Make sure to deep-copy IPv6 header portion in case the data 2234 * is in an mbuf cluster, so that we can safely override the IPv6 2235 * header portion later. 2236 */ 2237 if ((copym->m_flags & M_EXT) != 0 || 2238 copym->m_len < sizeof(struct ip6_hdr)) { 2239 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2240 if (copym == NULL) 2241 return; 2242 } 2243 2244 #ifdef DIAGNOSTIC 2245 if (copym->m_len < sizeof(*ip6)) { 2246 m_freem(copym); 2247 return; 2248 } 2249 #endif 2250 2251 ip6 = mtod(copym, struct ip6_hdr *); 2252 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2253 ip6->ip6_src.s6_addr16[1] = 0; 2254 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2255 ip6->ip6_dst.s6_addr16[1] = 0; 2256 2257 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2258 } 2259 2260 /* 2261 * Chop IPv6 header off from the payload. 2262 */ 2263 static int 2264 ip6_splithdr(m, exthdrs) 2265 struct mbuf *m; 2266 struct ip6_exthdrs *exthdrs; 2267 { 2268 struct mbuf *mh; 2269 struct ip6_hdr *ip6; 2270 2271 ip6 = mtod(m, struct ip6_hdr *); 2272 if (m->m_len > sizeof(*ip6)) { 2273 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2274 if (mh == 0) { 2275 m_freem(m); 2276 return ENOBUFS; 2277 } 2278 M_COPY_PKTHDR(mh, m); 2279 MH_ALIGN(mh, sizeof(*ip6)); 2280 m_tag_delete_chain(m, NULL); 2281 m->m_flags &= ~M_PKTHDR; 2282 m->m_len -= sizeof(*ip6); 2283 m->m_data += sizeof(*ip6); 2284 mh->m_next = m; 2285 m = mh; 2286 m->m_len = sizeof(*ip6); 2287 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2288 } 2289 exthdrs->ip6e_ip6 = m; 2290 return 0; 2291 } 2292 2293 /* 2294 * Compute IPv6 extension header length. 2295 */ 2296 int 2297 ip6_optlen(in6p) 2298 struct in6pcb *in6p; 2299 { 2300 int len; 2301 2302 if (!in6p->in6p_outputopts) 2303 return 0; 2304 2305 len = 0; 2306 #define elen(x) \ 2307 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2308 2309 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2310 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2311 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2312 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2313 return len; 2314 #undef elen 2315 } 2316
Indexes created Tue Sep 30 20:09:53 GMT 2025