ip6_output.c revision 1.76
1 /* $NetBSD: ip6_output.c,v 1.76 2004/01/19 05:14:58 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. 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 1.76 2004/01/19 05:14:58 itojun 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 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 126 struct ifnet *, struct in6_addr *, u_long *)); 127 128 extern struct ifnet loif[NLOOP]; 129 130 /* 131 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 132 * header (with pri, len, nxt, hlim, src, dst). 133 * This function may modify ver and hlim only. 134 * The mbuf chain containing the packet will be freed. 135 * The mbuf opt, if present, will not be freed. 136 * 137 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 138 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 139 * which is rt_rmx.rmx_mtu. 140 */ 141 int 142 ip6_output(m0, opt, ro, flags, im6o, so, 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 socket *so; 149 struct ifnet **ifpp; /* XXX: just for statistics */ 150 { 151 struct ip6_hdr *ip6, *mhip6; 152 struct ifnet *ifp, *origifp; 153 struct mbuf *m = m0; 154 int hlen, tlen, len, off; 155 struct route_in6 ip6route; 156 struct sockaddr_in6 *dst; 157 int error = 0; 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 secpolicy *sp = NULL; 168 169 ip6 = mtod(m, struct ip6_hdr *); 170 #endif /* IPSEC */ 171 172 #define MAKE_EXTHDR(hp, mp) \ 173 do { \ 174 if (hp) { \ 175 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 176 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 177 ((eh)->ip6e_len + 1) << 3); \ 178 if (error) \ 179 goto freehdrs; \ 180 } \ 181 } while (/*CONSTCOND*/ 0) 182 183 bzero(&exthdrs, sizeof(exthdrs)); 184 if (opt) { 185 /* Hop-by-Hop options header */ 186 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 187 /* Destination options header(1st part) */ 188 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 189 /* Routing header */ 190 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 191 /* Destination options header(2nd part) */ 192 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 193 } 194 195 #ifdef IPSEC 196 if ((flags & IPV6_FORWARDING) != 0) { 197 needipsec = 0; 198 goto skippolicycheck; 199 } 200 201 /* get a security policy for this packet */ 202 if (so == NULL) 203 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 204 else 205 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 206 207 if (sp == NULL) { 208 ipsec6stat.out_inval++; 209 goto freehdrs; 210 } 211 212 error = 0; 213 214 /* check policy */ 215 switch (sp->policy) { 216 case IPSEC_POLICY_DISCARD: 217 /* 218 * This packet is just discarded. 219 */ 220 ipsec6stat.out_polvio++; 221 goto freehdrs; 222 223 case IPSEC_POLICY_BYPASS: 224 case IPSEC_POLICY_NONE: 225 /* no need to do IPsec. */ 226 needipsec = 0; 227 break; 228 229 case IPSEC_POLICY_IPSEC: 230 if (sp->req == NULL) { 231 /* XXX should be panic ? */ 232 printf("ip6_output: No IPsec request specified.\n"); 233 error = EINVAL; 234 goto freehdrs; 235 } 236 needipsec = 1; 237 break; 238 239 case IPSEC_POLICY_ENTRUST: 240 default: 241 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 242 } 243 244 skippolicycheck:; 245 #endif /* IPSEC */ 246 247 /* 248 * Calculate the total length of the extension header chain. 249 * Keep the length of the unfragmentable part for fragmentation. 250 */ 251 optlen = 0; 252 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 253 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 254 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 255 unfragpartlen = optlen + sizeof(struct ip6_hdr); 256 /* NOTE: we don't add AH/ESP length here. do that later. */ 257 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 258 259 /* 260 * If we need IPsec, or there is at least one extension header, 261 * separate IP6 header from the payload. 262 */ 263 if ((needipsec || optlen) && !hdrsplit) { 264 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 265 m = NULL; 266 goto freehdrs; 267 } 268 m = exthdrs.ip6e_ip6; 269 hdrsplit++; 270 } 271 272 /* adjust pointer */ 273 ip6 = mtod(m, struct ip6_hdr *); 274 275 /* adjust mbuf packet header length */ 276 m->m_pkthdr.len += optlen; 277 plen = m->m_pkthdr.len - sizeof(*ip6); 278 279 /* If this is a jumbo payload, insert a jumbo payload option. */ 280 if (plen > IPV6_MAXPACKET) { 281 if (!hdrsplit) { 282 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 283 m = NULL; 284 goto freehdrs; 285 } 286 m = exthdrs.ip6e_ip6; 287 hdrsplit++; 288 } 289 /* adjust pointer */ 290 ip6 = mtod(m, struct ip6_hdr *); 291 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 292 goto freehdrs; 293 ip6->ip6_plen = 0; 294 } else 295 ip6->ip6_plen = htons(plen); 296 297 /* 298 * Concatenate headers and fill in next header fields. 299 * Here we have, on "m" 300 * IPv6 payload 301 * and we insert headers accordingly. Finally, we should be getting: 302 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 303 * 304 * during the header composing process, "m" points to IPv6 header. 305 * "mprev" points to an extension header prior to esp. 306 */ 307 { 308 u_char *nexthdrp = &ip6->ip6_nxt; 309 struct mbuf *mprev = m; 310 311 /* 312 * we treat dest2 specially. this makes IPsec processing 313 * much easier. 314 * 315 * result: IPv6 dest2 payload 316 * m and mprev will point to IPv6 header. 317 */ 318 if (exthdrs.ip6e_dest2) { 319 if (!hdrsplit) 320 panic("assumption failed: hdr not split"); 321 exthdrs.ip6e_dest2->m_next = m->m_next; 322 m->m_next = exthdrs.ip6e_dest2; 323 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 324 ip6->ip6_nxt = IPPROTO_DSTOPTS; 325 } 326 327 #define MAKE_CHAIN(m, mp, p, i)\ 328 do {\ 329 if (m) {\ 330 if (!hdrsplit) \ 331 panic("assumption failed: hdr not split"); \ 332 *mtod((m), u_char *) = *(p);\ 333 *(p) = (i);\ 334 p = mtod((m), u_char *);\ 335 (m)->m_next = (mp)->m_next;\ 336 (mp)->m_next = (m);\ 337 (mp) = (m);\ 338 }\ 339 } while (/*CONSTCOND*/ 0) 340 /* 341 * result: IPv6 hbh dest1 rthdr dest2 payload 342 * m will point to IPv6 header. mprev will point to the 343 * extension header prior to dest2 (rthdr in the above case). 344 */ 345 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 346 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 347 IPPROTO_DSTOPTS); 348 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 349 IPPROTO_ROUTING); 350 351 #ifdef IPSEC 352 if (!needipsec) 353 goto skip_ipsec2; 354 355 /* 356 * pointers after IPsec headers are not valid any more. 357 * other pointers need a great care too. 358 * (IPsec routines should not mangle mbufs prior to AH/ESP) 359 */ 360 exthdrs.ip6e_dest2 = NULL; 361 362 { 363 struct ip6_rthdr *rh = NULL; 364 int segleft_org = 0; 365 struct ipsec_output_state state; 366 367 if (exthdrs.ip6e_rthdr) { 368 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 369 segleft_org = rh->ip6r_segleft; 370 rh->ip6r_segleft = 0; 371 } 372 373 bzero(&state, sizeof(state)); 374 state.m = m; 375 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 376 &needipsectun); 377 m = state.m; 378 if (error) { 379 /* mbuf is already reclaimed in ipsec6_output_trans. */ 380 m = NULL; 381 switch (error) { 382 case EHOSTUNREACH: 383 case ENETUNREACH: 384 case EMSGSIZE: 385 case ENOBUFS: 386 case ENOMEM: 387 break; 388 default: 389 printf("ip6_output (ipsec): error code %d\n", error); 390 /* FALLTHROUGH */ 391 case ENOENT: 392 /* don't show these error codes to the user */ 393 error = 0; 394 break; 395 } 396 goto bad; 397 } 398 if (exthdrs.ip6e_rthdr) { 399 /* ah6_output doesn't modify mbuf chain */ 400 rh->ip6r_segleft = segleft_org; 401 } 402 } 403 skip_ipsec2:; 404 #endif 405 } 406 407 /* 408 * If there is a routing header, replace destination address field 409 * with the first hop of the routing header. 410 */ 411 if (exthdrs.ip6e_rthdr) { 412 struct ip6_rthdr *rh; 413 struct ip6_rthdr0 *rh0; 414 struct in6_addr *addr; 415 416 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 417 struct ip6_rthdr *)); 418 finaldst = ip6->ip6_dst; 419 switch (rh->ip6r_type) { 420 case IPV6_RTHDR_TYPE_0: 421 rh0 = (struct ip6_rthdr0 *)rh; 422 addr = (struct in6_addr *)(rh0 + 1); 423 ip6->ip6_dst = addr[0]; 424 bcopy(&addr[1], &addr[0], 425 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 426 addr[rh0->ip6r0_segleft - 1] = finaldst; 427 break; 428 default: /* is it possible? */ 429 error = EINVAL; 430 goto bad; 431 } 432 } 433 434 /* Source address validation */ 435 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 436 (flags & IPV6_UNSPECSRC) == 0) { 437 error = EOPNOTSUPP; 438 ip6stat.ip6s_badscope++; 439 goto bad; 440 } 441 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 442 error = EOPNOTSUPP; 443 ip6stat.ip6s_badscope++; 444 goto bad; 445 } 446 447 ip6stat.ip6s_localout++; 448 449 /* 450 * Route packet. 451 */ 452 if (ro == 0) { 453 ro = &ip6route; 454 bzero((caddr_t)ro, sizeof(*ro)); 455 } 456 ro_pmtu = ro; 457 if (opt && opt->ip6po_rthdr) 458 ro = &opt->ip6po_route; 459 dst = (struct sockaddr_in6 *)&ro->ro_dst; 460 /* 461 * If there is a cached route, 462 * check that it is to the same destination 463 * and is still up. If not, free it and try again. 464 */ 465 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 466 dst->sin6_family != AF_INET6 || 467 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 468 RTFREE(ro->ro_rt); 469 ro->ro_rt = (struct rtentry *)0; 470 } 471 if (ro->ro_rt == 0) { 472 bzero(dst, sizeof(*dst)); 473 dst->sin6_family = AF_INET6; 474 dst->sin6_len = sizeof(struct sockaddr_in6); 475 dst->sin6_addr = ip6->ip6_dst; 476 } 477 #ifdef IPSEC 478 if (needipsec && needipsectun) { 479 struct ipsec_output_state state; 480 481 /* 482 * All the extension headers will become inaccessible 483 * (since they can be encrypted). 484 * Don't panic, we need no more updates to extension headers 485 * on inner IPv6 packet (since they are now encapsulated). 486 * 487 * IPv6 [ESP|AH] IPv6 [extension headers] payload 488 */ 489 bzero(&exthdrs, sizeof(exthdrs)); 490 exthdrs.ip6e_ip6 = m; 491 492 bzero(&state, sizeof(state)); 493 state.m = m; 494 state.ro = (struct route *)ro; 495 state.dst = (struct sockaddr *)dst; 496 497 error = ipsec6_output_tunnel(&state, sp, flags); 498 499 m = state.m; 500 ro = (struct route_in6 *)state.ro; 501 dst = (struct sockaddr_in6 *)state.dst; 502 if (error) { 503 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 504 m0 = m = NULL; 505 m = NULL; 506 switch (error) { 507 case EHOSTUNREACH: 508 case ENETUNREACH: 509 case EMSGSIZE: 510 case ENOBUFS: 511 case ENOMEM: 512 break; 513 default: 514 printf("ip6_output (ipsec): error code %d\n", error); 515 /* FALLTHROUGH */ 516 case ENOENT: 517 /* don't show these error codes to the user */ 518 error = 0; 519 break; 520 } 521 goto bad; 522 } 523 524 exthdrs.ip6e_ip6 = m; 525 } 526 #endif /* IPSEC */ 527 528 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 529 /* Unicast */ 530 531 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 532 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 533 /* xxx 534 * interface selection comes here 535 * if an interface is specified from an upper layer, 536 * ifp must point it. 537 */ 538 if (ro->ro_rt == 0) { 539 /* 540 * non-bsdi always clone routes, if parent is 541 * PRF_CLONING. 542 */ 543 rtalloc((struct route *)ro); 544 } 545 if (ro->ro_rt == 0) { 546 ip6stat.ip6s_noroute++; 547 error = EHOSTUNREACH; 548 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 549 goto bad; 550 } 551 ifp = ro->ro_rt->rt_ifp; 552 ro->ro_rt->rt_use++; 553 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 554 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 555 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 556 557 in6_ifstat_inc(ifp, ifs6_out_request); 558 559 /* 560 * Check if the outgoing interface conflicts with 561 * the interface specified by ifi6_ifindex (if specified). 562 * Note that loopback interface is always okay. 563 * (this may happen when we are sending a packet to one of 564 * our own addresses.) 565 */ 566 if (opt && opt->ip6po_pktinfo 567 && opt->ip6po_pktinfo->ipi6_ifindex) { 568 if (!(ifp->if_flags & IFF_LOOPBACK) 569 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 570 ip6stat.ip6s_noroute++; 571 in6_ifstat_inc(ifp, ifs6_out_discard); 572 error = EHOSTUNREACH; 573 goto bad; 574 } 575 } 576 577 if (opt && opt->ip6po_hlim != -1) 578 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 579 } else { 580 /* Multicast */ 581 struct in6_multi *in6m; 582 583 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 584 585 /* 586 * See if the caller provided any multicast options 587 */ 588 ifp = NULL; 589 if (im6o != NULL) { 590 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 591 if (im6o->im6o_multicast_ifp != NULL) 592 ifp = im6o->im6o_multicast_ifp; 593 } else 594 ip6->ip6_hlim = ip6_defmcasthlim; 595 596 /* 597 * See if the caller provided the outgoing interface 598 * as an ancillary data. 599 * Boundary check for ifindex is assumed to be already done. 600 */ 601 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 602 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 603 604 /* 605 * If the destination is a node-local scope multicast, 606 * the packet should be loop-backed only. 607 */ 608 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 609 /* 610 * If the outgoing interface is already specified, 611 * it should be a loopback interface. 612 */ 613 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 614 ip6stat.ip6s_badscope++; 615 error = ENETUNREACH; /* XXX: better error? */ 616 /* XXX correct ifp? */ 617 in6_ifstat_inc(ifp, ifs6_out_discard); 618 goto bad; 619 } else { 620 ifp = &loif[0]; 621 } 622 } 623 624 if (opt && opt->ip6po_hlim != -1) 625 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 626 627 /* 628 * If caller did not provide an interface lookup a 629 * default in the routing table. This is either a 630 * default for the speicfied group (i.e. a host 631 * route), or a multicast default (a route for the 632 * ``net'' ff00::/8). 633 */ 634 if (ifp == NULL) { 635 if (ro->ro_rt == 0) { 636 ro->ro_rt = rtalloc1((struct sockaddr *) 637 &ro->ro_dst, 0); 638 } 639 if (ro->ro_rt == 0) { 640 ip6stat.ip6s_noroute++; 641 error = EHOSTUNREACH; 642 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 643 goto bad; 644 } 645 ifp = ro->ro_rt->rt_ifp; 646 ro->ro_rt->rt_use++; 647 } 648 649 if ((flags & IPV6_FORWARDING) == 0) 650 in6_ifstat_inc(ifp, ifs6_out_request); 651 in6_ifstat_inc(ifp, ifs6_out_mcast); 652 653 /* 654 * Confirm that the outgoing interface supports multicast. 655 */ 656 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 657 ip6stat.ip6s_noroute++; 658 in6_ifstat_inc(ifp, ifs6_out_discard); 659 error = ENETUNREACH; 660 goto bad; 661 } 662 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 663 if (in6m != NULL && 664 (im6o == NULL || im6o->im6o_multicast_loop)) { 665 /* 666 * If we belong to the destination multicast group 667 * on the outgoing interface, and the caller did not 668 * forbid loopback, loop back a copy. 669 */ 670 ip6_mloopback(ifp, m, dst); 671 } else { 672 /* 673 * If we are acting as a multicast router, perform 674 * multicast forwarding as if the packet had just 675 * arrived on the interface to which we are about 676 * to send. The multicast forwarding function 677 * recursively calls this function, using the 678 * IPV6_FORWARDING flag to prevent infinite recursion. 679 * 680 * Multicasts that are looped back by ip6_mloopback(), 681 * above, will be forwarded by the ip6_input() routine, 682 * if necessary. 683 */ 684 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 685 if (ip6_mforward(ip6, ifp, m) != 0) { 686 m_freem(m); 687 goto done; 688 } 689 } 690 } 691 /* 692 * Multicasts with a hoplimit of zero may be looped back, 693 * above, but must not be transmitted on a network. 694 * Also, multicasts addressed to the loopback interface 695 * are not sent -- the above call to ip6_mloopback() will 696 * loop back a copy if this host actually belongs to the 697 * destination group on the loopback interface. 698 */ 699 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 700 m_freem(m); 701 goto done; 702 } 703 } 704 705 /* 706 * Fill the outgoing inteface to tell the upper layer 707 * to increment per-interface statistics. 708 */ 709 if (ifpp) 710 *ifpp = ifp; 711 712 /* Determine path MTU. */ 713 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu)) != 0) 714 goto bad; 715 716 /* 717 * The caller of this function may specify to use the minimum MTU 718 * in some cases. 719 */ 720 if (mtu > IPV6_MMTU) { 721 if ((flags & IPV6_MINMTU)) 722 mtu = IPV6_MMTU; 723 } 724 725 /* Fake scoped addresses */ 726 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 727 /* 728 * If source or destination address is a scoped address, and 729 * the packet is going to be sent to a loopback interface, 730 * we should keep the original interface. 731 */ 732 733 /* 734 * XXX: this is a very experimental and temporary solution. 735 * We eventually have sockaddr_in6 and use the sin6_scope_id 736 * field of the structure here. 737 * We rely on the consistency between two scope zone ids 738 * of source add destination, which should already be assured 739 * Larger scopes than link will be supported in the near 740 * future. 741 */ 742 origifp = NULL; 743 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 744 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 745 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 746 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 747 /* 748 * XXX: origifp can be NULL even in those two cases above. 749 * For example, if we remove the (only) link-local address 750 * from the loopback interface, and try to send a link-local 751 * address without link-id information. Then the source 752 * address is ::1, and the destination address is the 753 * link-local address with its s6_addr16[1] being zero. 754 * What is worse, if the packet goes to the loopback interface 755 * by a default rejected route, the null pointer would be 756 * passed to looutput, and the kernel would hang. 757 * The following last resort would prevent such disaster. 758 */ 759 if (origifp == NULL) 760 origifp = ifp; 761 } else 762 origifp = ifp; 763 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 764 ip6->ip6_src.s6_addr16[1] = 0; 765 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 766 ip6->ip6_dst.s6_addr16[1] = 0; 767 768 /* 769 * If the outgoing packet contains a hop-by-hop options header, 770 * it must be examined and processed even by the source node. 771 * (RFC 2460, section 4.) 772 */ 773 if (exthdrs.ip6e_hbh) { 774 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 775 u_int32_t dummy1; /* XXX unused */ 776 u_int32_t dummy2; /* XXX unused */ 777 778 /* 779 * XXX: if we have to send an ICMPv6 error to the sender, 780 * we need the M_LOOP flag since icmp6_error() expects 781 * the IPv6 and the hop-by-hop options header are 782 * continuous unless the flag is set. 783 */ 784 m->m_flags |= M_LOOP; 785 m->m_pkthdr.rcvif = ifp; 786 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 787 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 788 &dummy1, &dummy2) < 0) { 789 /* m was already freed at this point */ 790 error = EINVAL;/* better error? */ 791 goto done; 792 } 793 m->m_flags &= ~M_LOOP; /* XXX */ 794 m->m_pkthdr.rcvif = NULL; 795 } 796 797 #ifdef PFIL_HOOKS 798 /* 799 * Run through list of hooks for output packets. 800 */ 801 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 802 goto done; 803 if (m == NULL) 804 goto done; 805 ip6 = mtod(m, struct ip6_hdr *); 806 #endif /* PFIL_HOOKS */ 807 /* 808 * Send the packet to the outgoing interface. 809 * If necessary, do IPv6 fragmentation before sending. 810 */ 811 tlen = m->m_pkthdr.len; 812 if (tlen <= mtu) { 813 #ifdef IFA_STATS 814 struct in6_ifaddr *ia6; 815 ip6 = mtod(m, struct ip6_hdr *); 816 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 817 if (ia6) { 818 /* Record statistics for this interface address. */ 819 ia6->ia_ifa.ifa_data.ifad_outbytes += 820 m->m_pkthdr.len; 821 } 822 #endif 823 #ifdef IPSEC 824 /* clean ipsec history once it goes out of the node */ 825 ipsec_delaux(m); 826 #endif 827 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 828 goto done; 829 } else if (mtu < IPV6_MMTU) { 830 /* 831 * note that path MTU is never less than IPV6_MMTU 832 * (see icmp6_input). 833 */ 834 error = EMSGSIZE; 835 in6_ifstat_inc(ifp, ifs6_out_fragfail); 836 goto bad; 837 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 838 error = EMSGSIZE; 839 in6_ifstat_inc(ifp, ifs6_out_fragfail); 840 goto bad; 841 } else { 842 struct mbuf **mnext, *m_frgpart; 843 struct ip6_frag *ip6f; 844 u_int32_t id = htonl(ip6_randomid()); 845 u_char nextproto; 846 847 /* 848 * Too large for the destination or interface; 849 * fragment if possible. 850 * Must be able to put at least 8 bytes per fragment. 851 */ 852 hlen = unfragpartlen; 853 if (mtu > IPV6_MAXPACKET) 854 mtu = IPV6_MAXPACKET; 855 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 856 if (len < 8) { 857 error = EMSGSIZE; 858 in6_ifstat_inc(ifp, ifs6_out_fragfail); 859 goto bad; 860 } 861 862 mnext = &m->m_nextpkt; 863 864 /* 865 * Change the next header field of the last header in the 866 * unfragmentable part. 867 */ 868 if (exthdrs.ip6e_rthdr) { 869 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 870 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 871 } else if (exthdrs.ip6e_dest1) { 872 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 873 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 874 } else if (exthdrs.ip6e_hbh) { 875 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 876 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 877 } else { 878 nextproto = ip6->ip6_nxt; 879 ip6->ip6_nxt = IPPROTO_FRAGMENT; 880 } 881 882 /* 883 * Loop through length of segment after first fragment, 884 * make new header and copy data of each part and link onto 885 * chain. 886 */ 887 m0 = m; 888 for (off = hlen; off < tlen; off += len) { 889 struct mbuf *mlast; 890 891 MGETHDR(m, M_DONTWAIT, MT_HEADER); 892 if (!m) { 893 error = ENOBUFS; 894 ip6stat.ip6s_odropped++; 895 goto sendorfree; 896 } 897 m->m_flags = m0->m_flags & M_COPYFLAGS; 898 *mnext = m; 899 mnext = &m->m_nextpkt; 900 m->m_data += max_linkhdr; 901 mhip6 = mtod(m, struct ip6_hdr *); 902 *mhip6 = *ip6; 903 m->m_len = sizeof(*mhip6); 904 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 905 if (error) { 906 ip6stat.ip6s_odropped++; 907 goto sendorfree; 908 } 909 ip6f->ip6f_offlg = htons((u_int16_t)((off - hlen) & ~7)); 910 if (off + len >= tlen) 911 len = tlen - off; 912 else 913 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 914 mhip6->ip6_plen = htons((u_int16_t)(len + hlen + 915 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 916 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 917 error = ENOBUFS; 918 ip6stat.ip6s_odropped++; 919 goto sendorfree; 920 } 921 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 922 ; 923 mlast->m_next = m_frgpart; 924 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 925 m->m_pkthdr.rcvif = (struct ifnet *)0; 926 ip6f->ip6f_reserved = 0; 927 ip6f->ip6f_ident = id; 928 ip6f->ip6f_nxt = nextproto; 929 ip6stat.ip6s_ofragments++; 930 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 931 } 932 933 in6_ifstat_inc(ifp, ifs6_out_fragok); 934 } 935 936 /* 937 * Remove leading garbages. 938 */ 939 sendorfree: 940 m = m0->m_nextpkt; 941 m0->m_nextpkt = 0; 942 m_freem(m0); 943 for (m0 = m; m; m = m0) { 944 m0 = m->m_nextpkt; 945 m->m_nextpkt = 0; 946 if (error == 0) { 947 #ifdef IFA_STATS 948 struct in6_ifaddr *ia6; 949 ip6 = mtod(m, struct ip6_hdr *); 950 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 951 if (ia6) { 952 /* 953 * Record statistics for this interface 954 * address. 955 */ 956 ia6->ia_ifa.ifa_data.ifad_outbytes += 957 m->m_pkthdr.len; 958 } 959 #endif 960 #ifdef IPSEC 961 /* clean ipsec history once it goes out of the node */ 962 ipsec_delaux(m); 963 #endif 964 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 965 } else 966 m_freem(m); 967 } 968 969 if (error == 0) 970 ip6stat.ip6s_fragmented++; 971 972 done: 973 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 974 RTFREE(ro->ro_rt); 975 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 976 RTFREE(ro_pmtu->ro_rt); 977 } 978 979 #ifdef IPSEC 980 if (sp != NULL) 981 key_freesp(sp); 982 #endif /* IPSEC */ 983 984 return (error); 985 986 freehdrs: 987 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 988 m_freem(exthdrs.ip6e_dest1); 989 m_freem(exthdrs.ip6e_rthdr); 990 m_freem(exthdrs.ip6e_dest2); 991 /* FALLTHROUGH */ 992 bad: 993 m_freem(m); 994 goto done; 995 } 996 997 static int 998 ip6_copyexthdr(mp, hdr, hlen) 999 struct mbuf **mp; 1000 caddr_t hdr; 1001 int hlen; 1002 { 1003 struct mbuf *m; 1004 1005 if (hlen > MCLBYTES) 1006 return (ENOBUFS); /* XXX */ 1007 1008 MGET(m, M_DONTWAIT, MT_DATA); 1009 if (!m) 1010 return (ENOBUFS); 1011 1012 if (hlen > MLEN) { 1013 MCLGET(m, M_DONTWAIT); 1014 if ((m->m_flags & M_EXT) == 0) { 1015 m_free(m); 1016 return (ENOBUFS); 1017 } 1018 } 1019 m->m_len = hlen; 1020 if (hdr) 1021 bcopy(hdr, mtod(m, caddr_t), hlen); 1022 1023 *mp = m; 1024 return (0); 1025 } 1026 1027 /* 1028 * Insert jumbo payload option. 1029 */ 1030 static int 1031 ip6_insert_jumboopt(exthdrs, plen) 1032 struct ip6_exthdrs *exthdrs; 1033 u_int32_t plen; 1034 { 1035 struct mbuf *mopt; 1036 u_int8_t *optbuf; 1037 u_int32_t v; 1038 1039 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1040 1041 /* 1042 * If there is no hop-by-hop options header, allocate new one. 1043 * If there is one but it doesn't have enough space to store the 1044 * jumbo payload option, allocate a cluster to store the whole options. 1045 * Otherwise, use it to store the options. 1046 */ 1047 if (exthdrs->ip6e_hbh == 0) { 1048 MGET(mopt, M_DONTWAIT, MT_DATA); 1049 if (mopt == 0) 1050 return (ENOBUFS); 1051 mopt->m_len = JUMBOOPTLEN; 1052 optbuf = mtod(mopt, u_int8_t *); 1053 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1054 exthdrs->ip6e_hbh = mopt; 1055 } else { 1056 struct ip6_hbh *hbh; 1057 1058 mopt = exthdrs->ip6e_hbh; 1059 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1060 /* 1061 * XXX assumption: 1062 * - exthdrs->ip6e_hbh is not referenced from places 1063 * other than exthdrs. 1064 * - exthdrs->ip6e_hbh is not an mbuf chain. 1065 */ 1066 int oldoptlen = mopt->m_len; 1067 struct mbuf *n; 1068 1069 /* 1070 * XXX: give up if the whole (new) hbh header does 1071 * not fit even in an mbuf cluster. 1072 */ 1073 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1074 return (ENOBUFS); 1075 1076 /* 1077 * As a consequence, we must always prepare a cluster 1078 * at this point. 1079 */ 1080 MGET(n, M_DONTWAIT, MT_DATA); 1081 if (n) { 1082 MCLGET(n, M_DONTWAIT); 1083 if ((n->m_flags & M_EXT) == 0) { 1084 m_freem(n); 1085 n = NULL; 1086 } 1087 } 1088 if (!n) 1089 return (ENOBUFS); 1090 n->m_len = oldoptlen + JUMBOOPTLEN; 1091 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1092 oldoptlen); 1093 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1094 m_freem(mopt); 1095 mopt = exthdrs->ip6e_hbh = n; 1096 } else { 1097 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1098 mopt->m_len += JUMBOOPTLEN; 1099 } 1100 optbuf[0] = IP6OPT_PADN; 1101 optbuf[1] = 0; 1102 1103 /* 1104 * Adjust the header length according to the pad and 1105 * the jumbo payload option. 1106 */ 1107 hbh = mtod(mopt, struct ip6_hbh *); 1108 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1109 } 1110 1111 /* fill in the option. */ 1112 optbuf[2] = IP6OPT_JUMBO; 1113 optbuf[3] = 4; 1114 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1115 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1116 1117 /* finally, adjust the packet header length */ 1118 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1119 1120 return (0); 1121 #undef JUMBOOPTLEN 1122 } 1123 1124 /* 1125 * Insert fragment header and copy unfragmentable header portions. 1126 */ 1127 static int 1128 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1129 struct mbuf *m0, *m; 1130 int hlen; 1131 struct ip6_frag **frghdrp; 1132 { 1133 struct mbuf *n, *mlast; 1134 1135 if (hlen > sizeof(struct ip6_hdr)) { 1136 n = m_copym(m0, sizeof(struct ip6_hdr), 1137 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1138 if (n == 0) 1139 return (ENOBUFS); 1140 m->m_next = n; 1141 } else 1142 n = m; 1143 1144 /* Search for the last mbuf of unfragmentable part. */ 1145 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1146 ; 1147 1148 if ((mlast->m_flags & M_EXT) == 0 && 1149 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1150 /* use the trailing space of the last mbuf for the fragment hdr */ 1151 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1152 mlast->m_len); 1153 mlast->m_len += sizeof(struct ip6_frag); 1154 m->m_pkthdr.len += sizeof(struct ip6_frag); 1155 } else { 1156 /* allocate a new mbuf for the fragment header */ 1157 struct mbuf *mfrg; 1158 1159 MGET(mfrg, M_DONTWAIT, MT_DATA); 1160 if (mfrg == 0) 1161 return (ENOBUFS); 1162 mfrg->m_len = sizeof(struct ip6_frag); 1163 *frghdrp = mtod(mfrg, struct ip6_frag *); 1164 mlast->m_next = mfrg; 1165 } 1166 1167 return (0); 1168 } 1169 1170 static int 1171 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup) 1172 struct route_in6 *ro_pmtu, *ro; 1173 struct ifnet *ifp; 1174 struct in6_addr *dst; 1175 u_long *mtup; 1176 { 1177 u_int32_t mtu = 0; 1178 int error = 0; 1179 1180 if (ro_pmtu != ro) { 1181 /* The first hop and the final destination may differ. */ 1182 struct sockaddr_in6 *sa6_dst = 1183 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1184 if (ro_pmtu->ro_rt && 1185 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1186 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1187 RTFREE(ro_pmtu->ro_rt); 1188 ro_pmtu->ro_rt = (struct rtentry *)0; 1189 } 1190 if (ro_pmtu->ro_rt == 0) { 1191 bzero(sa6_dst, sizeof(*sa6_dst)); 1192 sa6_dst->sin6_family = AF_INET6; 1193 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1194 sa6_dst->sin6_addr = *dst; 1195 1196 rtalloc((struct route *)ro_pmtu); 1197 } 1198 } 1199 if (ro_pmtu->ro_rt) { 1200 u_int32_t ifmtu; 1201 1202 if (ifp == NULL) 1203 ifp = ro_pmtu->ro_rt->rt_ifp; 1204 ifmtu = IN6_LINKMTU(ifp); 1205 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1206 if (mtu == 0) 1207 mtu = ifmtu; 1208 else if (mtu > ifmtu) { 1209 /* 1210 * The MTU on the route is larger than the MTU on 1211 * the interface! This shouldn't happen, unless the 1212 * MTU of the interface has been changed after the 1213 * interface was brought up. Change the MTU in the 1214 * route to match the interface MTU (as long as the 1215 * field isn't locked). 1216 * 1217 * if MTU on the route is 0, we need to fix the MTU. 1218 * this case happens with path MTU discovery timeouts. 1219 */ 1220 mtu = ifmtu; 1221 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1222 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1223 } 1224 } else if (ifp) { 1225 mtu = IN6_LINKMTU(ifp); 1226 } else 1227 error = EHOSTUNREACH; /* XXX */ 1228 1229 *mtup = mtu; 1230 return (error); 1231 } 1232 1233 /* 1234 * IP6 socket option processing. 1235 */ 1236 int 1237 ip6_ctloutput(op, so, level, optname, mp) 1238 int op; 1239 struct socket *so; 1240 int level, optname; 1241 struct mbuf **mp; 1242 { 1243 struct in6pcb *in6p = sotoin6pcb(so); 1244 struct mbuf *m = *mp; 1245 int optval = 0; 1246 int error = 0; 1247 struct proc *p = curproc; /* XXX */ 1248 1249 if (level == IPPROTO_IPV6) { 1250 switch (op) { 1251 case PRCO_SETOPT: 1252 switch (optname) { 1253 case IPV6_PKTOPTIONS: 1254 /* m is freed in ip6_pcbopts */ 1255 return (ip6_pcbopts(&in6p->in6p_outputopts, 1256 m, so)); 1257 case IPV6_HOPOPTS: 1258 case IPV6_DSTOPTS: 1259 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1260 error = EPERM; 1261 break; 1262 } 1263 /* FALLTHROUGH */ 1264 case IPV6_UNICAST_HOPS: 1265 case IPV6_RECVOPTS: 1266 case IPV6_RECVRETOPTS: 1267 case IPV6_RECVDSTADDR: 1268 case IPV6_PKTINFO: 1269 case IPV6_HOPLIMIT: 1270 case IPV6_RTHDR: 1271 case IPV6_FAITH: 1272 case IPV6_V6ONLY: 1273 if (!m || m->m_len != sizeof(int)) { 1274 error = EINVAL; 1275 break; 1276 } 1277 optval = *mtod(m, int *); 1278 switch (optname) { 1279 1280 case IPV6_UNICAST_HOPS: 1281 if (optval < -1 || optval >= 256) 1282 error = EINVAL; 1283 else { 1284 /* -1 = kernel default */ 1285 in6p->in6p_hops = optval; 1286 } 1287 break; 1288 #define OPTSET(bit) \ 1289 do { \ 1290 if (optval) \ 1291 in6p->in6p_flags |= (bit); \ 1292 else \ 1293 in6p->in6p_flags &= ~(bit); \ 1294 } while (/*CONSTCOND*/ 0) 1295 1296 case IPV6_RECVOPTS: 1297 OPTSET(IN6P_RECVOPTS); 1298 break; 1299 1300 case IPV6_RECVRETOPTS: 1301 OPTSET(IN6P_RECVRETOPTS); 1302 break; 1303 1304 case IPV6_RECVDSTADDR: 1305 OPTSET(IN6P_RECVDSTADDR); 1306 break; 1307 1308 case IPV6_PKTINFO: 1309 OPTSET(IN6P_PKTINFO); 1310 break; 1311 1312 case IPV6_HOPLIMIT: 1313 OPTSET(IN6P_HOPLIMIT); 1314 break; 1315 1316 case IPV6_HOPOPTS: 1317 OPTSET(IN6P_HOPOPTS); 1318 break; 1319 1320 case IPV6_DSTOPTS: 1321 OPTSET(IN6P_DSTOPTS); 1322 break; 1323 1324 case IPV6_RTHDR: 1325 OPTSET(IN6P_RTHDR); 1326 break; 1327 1328 case IPV6_FAITH: 1329 OPTSET(IN6P_FAITH); 1330 break; 1331 1332 case IPV6_V6ONLY: 1333 /* 1334 * make setsockopt(IPV6_V6ONLY) 1335 * available only prior to bind(2). 1336 * see ipng mailing list, Jun 22 2001. 1337 */ 1338 if (in6p->in6p_lport || 1339 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1340 error = EINVAL; 1341 break; 1342 } 1343 #ifdef INET6_BINDV6ONLY 1344 if (!optval) 1345 error = EINVAL; 1346 #else 1347 OPTSET(IN6P_IPV6_V6ONLY); 1348 #endif 1349 break; 1350 } 1351 break; 1352 #undef OPTSET 1353 1354 case IPV6_MULTICAST_IF: 1355 case IPV6_MULTICAST_HOPS: 1356 case IPV6_MULTICAST_LOOP: 1357 case IPV6_JOIN_GROUP: 1358 case IPV6_LEAVE_GROUP: 1359 error = ip6_setmoptions(optname, 1360 &in6p->in6p_moptions, m); 1361 break; 1362 1363 case IPV6_PORTRANGE: 1364 optval = *mtod(m, int *); 1365 1366 switch (optval) { 1367 case IPV6_PORTRANGE_DEFAULT: 1368 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1369 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1370 break; 1371 1372 case IPV6_PORTRANGE_HIGH: 1373 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1374 in6p->in6p_flags |= IN6P_HIGHPORT; 1375 break; 1376 1377 case IPV6_PORTRANGE_LOW: 1378 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1379 in6p->in6p_flags |= IN6P_LOWPORT; 1380 break; 1381 1382 default: 1383 error = EINVAL; 1384 break; 1385 } 1386 break; 1387 1388 #ifdef IPSEC 1389 case IPV6_IPSEC_POLICY: 1390 { 1391 caddr_t req = NULL; 1392 size_t len = 0; 1393 1394 int priv = 0; 1395 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1396 priv = 0; 1397 else 1398 priv = 1; 1399 if (m) { 1400 req = mtod(m, caddr_t); 1401 len = m->m_len; 1402 } 1403 error = ipsec6_set_policy(in6p, 1404 optname, req, len, priv); 1405 } 1406 break; 1407 #endif /* IPSEC */ 1408 1409 default: 1410 error = ENOPROTOOPT; 1411 break; 1412 } 1413 if (m) 1414 (void)m_free(m); 1415 break; 1416 1417 case PRCO_GETOPT: 1418 switch (optname) { 1419 1420 case IPV6_OPTIONS: 1421 case IPV6_RETOPTS: 1422 error = ENOPROTOOPT; 1423 break; 1424 1425 case IPV6_PKTOPTIONS: 1426 if (in6p->in6p_options) { 1427 *mp = m_copym(in6p->in6p_options, 0, 1428 M_COPYALL, M_WAIT); 1429 } else { 1430 *mp = m_get(M_WAIT, MT_SOOPTS); 1431 (*mp)->m_len = 0; 1432 } 1433 break; 1434 1435 case IPV6_HOPOPTS: 1436 case IPV6_DSTOPTS: 1437 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1438 error = EPERM; 1439 break; 1440 } 1441 /* FALLTHROUGH */ 1442 case IPV6_UNICAST_HOPS: 1443 case IPV6_RECVOPTS: 1444 case IPV6_RECVRETOPTS: 1445 case IPV6_RECVDSTADDR: 1446 case IPV6_PORTRANGE: 1447 case IPV6_PKTINFO: 1448 case IPV6_HOPLIMIT: 1449 case IPV6_RTHDR: 1450 case IPV6_FAITH: 1451 case IPV6_V6ONLY: 1452 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1453 m->m_len = sizeof(int); 1454 switch (optname) { 1455 1456 case IPV6_UNICAST_HOPS: 1457 optval = in6p->in6p_hops; 1458 break; 1459 1460 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1461 1462 case IPV6_RECVOPTS: 1463 optval = OPTBIT(IN6P_RECVOPTS); 1464 break; 1465 1466 case IPV6_RECVRETOPTS: 1467 optval = OPTBIT(IN6P_RECVRETOPTS); 1468 break; 1469 1470 case IPV6_RECVDSTADDR: 1471 optval = OPTBIT(IN6P_RECVDSTADDR); 1472 break; 1473 1474 case IPV6_PORTRANGE: 1475 { 1476 int flags; 1477 flags = in6p->in6p_flags; 1478 if (flags & IN6P_HIGHPORT) 1479 optval = IPV6_PORTRANGE_HIGH; 1480 else if (flags & IN6P_LOWPORT) 1481 optval = IPV6_PORTRANGE_LOW; 1482 else 1483 optval = 0; 1484 break; 1485 } 1486 1487 case IPV6_PKTINFO: 1488 optval = OPTBIT(IN6P_PKTINFO); 1489 break; 1490 1491 case IPV6_HOPLIMIT: 1492 optval = OPTBIT(IN6P_HOPLIMIT); 1493 break; 1494 1495 case IPV6_HOPOPTS: 1496 optval = OPTBIT(IN6P_HOPOPTS); 1497 break; 1498 1499 case IPV6_DSTOPTS: 1500 optval = OPTBIT(IN6P_DSTOPTS); 1501 break; 1502 1503 case IPV6_RTHDR: 1504 optval = OPTBIT(IN6P_RTHDR); 1505 break; 1506 1507 case IPV6_FAITH: 1508 optval = OPTBIT(IN6P_FAITH); 1509 break; 1510 1511 case IPV6_V6ONLY: 1512 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1513 break; 1514 } 1515 *mtod(m, int *) = optval; 1516 break; 1517 1518 case IPV6_MULTICAST_IF: 1519 case IPV6_MULTICAST_HOPS: 1520 case IPV6_MULTICAST_LOOP: 1521 case IPV6_JOIN_GROUP: 1522 case IPV6_LEAVE_GROUP: 1523 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1524 break; 1525 1526 #ifdef IPSEC 1527 case IPV6_IPSEC_POLICY: 1528 { 1529 caddr_t req = NULL; 1530 size_t len = 0; 1531 1532 if (m) { 1533 req = mtod(m, caddr_t); 1534 len = m->m_len; 1535 } 1536 error = ipsec6_get_policy(in6p, req, len, mp); 1537 break; 1538 } 1539 #endif /* IPSEC */ 1540 1541 default: 1542 error = ENOPROTOOPT; 1543 break; 1544 } 1545 break; 1546 } 1547 } else { 1548 error = EINVAL; 1549 if (op == PRCO_SETOPT && *mp) 1550 (void)m_free(*mp); 1551 } 1552 return (error); 1553 } 1554 1555 int 1556 ip6_raw_ctloutput(op, so, level, optname, mp) 1557 int op; 1558 struct socket *so; 1559 int level, optname; 1560 struct mbuf **mp; 1561 { 1562 int error = 0, optval, optlen; 1563 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1564 struct in6pcb *in6p = sotoin6pcb(so); 1565 struct mbuf *m = *mp; 1566 1567 optlen = m ? m->m_len : 0; 1568 1569 if (level != IPPROTO_IPV6) { 1570 if (op == PRCO_SETOPT && *mp) 1571 (void)m_free(*mp); 1572 return (EINVAL); 1573 } 1574 1575 switch (optname) { 1576 case IPV6_CHECKSUM: 1577 /* 1578 * For ICMPv6 sockets, no modification allowed for checksum 1579 * offset, permit "no change" values to help existing apps. 1580 * 1581 * XXX 2292bis says: "An attempt to set IPV6_CHECKSUM 1582 * for an ICMPv6 socket will fail." 1583 * The current behavior does not meet 2292bis. 1584 */ 1585 switch (op) { 1586 case PRCO_SETOPT: 1587 if (optlen != sizeof(int)) { 1588 error = EINVAL; 1589 break; 1590 } 1591 optval = *mtod(m, int *); 1592 if ((optval % 2) != 0) { 1593 /* the API assumes even offset values */ 1594 error = EINVAL; 1595 } else if (so->so_proto->pr_protocol == 1596 IPPROTO_ICMPV6) { 1597 if (optval != icmp6off) 1598 error = EINVAL; 1599 } else 1600 in6p->in6p_cksum = optval; 1601 break; 1602 1603 case PRCO_GETOPT: 1604 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1605 optval = icmp6off; 1606 else 1607 optval = in6p->in6p_cksum; 1608 1609 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1610 m->m_len = sizeof(int); 1611 *mtod(m, int *) = optval; 1612 break; 1613 1614 default: 1615 error = EINVAL; 1616 break; 1617 } 1618 break; 1619 1620 default: 1621 error = ENOPROTOOPT; 1622 break; 1623 } 1624 1625 if (op == PRCO_SETOPT && m) 1626 (void)m_free(m); 1627 1628 return (error); 1629 } 1630 1631 /* 1632 * Set up IP6 options in pcb for insertion in output packets. 1633 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1634 * with destination address if source routed. 1635 */ 1636 static int 1637 ip6_pcbopts(pktopt, m, so) 1638 struct ip6_pktopts **pktopt; 1639 struct mbuf *m; 1640 struct socket *so; 1641 { 1642 struct ip6_pktopts *opt = *pktopt; 1643 int error = 0; 1644 struct proc *p = curproc; /* XXX */ 1645 int priv = 0; 1646 1647 /* turn off any old options. */ 1648 if (opt) { 1649 if (opt->ip6po_m) 1650 (void)m_free(opt->ip6po_m); 1651 } else 1652 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1653 *pktopt = 0; 1654 1655 if (!m || m->m_len == 0) { 1656 /* 1657 * Only turning off any previous options. 1658 */ 1659 free(opt, M_IP6OPT); 1660 if (m) 1661 (void)m_free(m); 1662 return (0); 1663 } 1664 1665 /* set options specified by user. */ 1666 if (p && !suser(p->p_ucred, &p->p_acflag)) 1667 priv = 1; 1668 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1669 (void)m_free(m); 1670 free(opt, M_IP6OPT); 1671 return (error); 1672 } 1673 *pktopt = opt; 1674 return (0); 1675 } 1676 1677 /* 1678 * Set the IP6 multicast options in response to user setsockopt(). 1679 */ 1680 static int 1681 ip6_setmoptions(optname, im6op, m) 1682 int optname; 1683 struct ip6_moptions **im6op; 1684 struct mbuf *m; 1685 { 1686 int error = 0; 1687 u_int loop, ifindex; 1688 struct ipv6_mreq *mreq; 1689 struct ifnet *ifp; 1690 struct ip6_moptions *im6o = *im6op; 1691 struct route_in6 ro; 1692 struct sockaddr_in6 *dst; 1693 struct in6_multi_mship *imm; 1694 struct proc *p = curproc; /* XXX */ 1695 1696 if (im6o == NULL) { 1697 /* 1698 * No multicast option buffer attached to the pcb; 1699 * allocate one and initialize to default values. 1700 */ 1701 im6o = (struct ip6_moptions *) 1702 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1703 1704 if (im6o == NULL) 1705 return (ENOBUFS); 1706 *im6op = im6o; 1707 im6o->im6o_multicast_ifp = NULL; 1708 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1709 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1710 LIST_INIT(&im6o->im6o_memberships); 1711 } 1712 1713 switch (optname) { 1714 1715 case IPV6_MULTICAST_IF: 1716 /* 1717 * Select the interface for outgoing multicast packets. 1718 */ 1719 if (m == NULL || m->m_len != sizeof(u_int)) { 1720 error = EINVAL; 1721 break; 1722 } 1723 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1724 if (ifindex < 0 || if_indexlim <= ifindex || 1725 !ifindex2ifnet[ifindex]) { 1726 error = ENXIO; /* XXX EINVAL? */ 1727 break; 1728 } 1729 ifp = ifindex2ifnet[ifindex]; 1730 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1731 error = EADDRNOTAVAIL; 1732 break; 1733 } 1734 im6o->im6o_multicast_ifp = ifp; 1735 break; 1736 1737 case IPV6_MULTICAST_HOPS: 1738 { 1739 /* 1740 * Set the IP6 hoplimit for outgoing multicast packets. 1741 */ 1742 int optval; 1743 if (m == NULL || m->m_len != sizeof(int)) { 1744 error = EINVAL; 1745 break; 1746 } 1747 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1748 if (optval < -1 || optval >= 256) 1749 error = EINVAL; 1750 else if (optval == -1) 1751 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1752 else 1753 im6o->im6o_multicast_hlim = optval; 1754 break; 1755 } 1756 1757 case IPV6_MULTICAST_LOOP: 1758 /* 1759 * Set the loopback flag for outgoing multicast packets. 1760 * Must be zero or one. 1761 */ 1762 if (m == NULL || m->m_len != sizeof(u_int)) { 1763 error = EINVAL; 1764 break; 1765 } 1766 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1767 if (loop > 1) { 1768 error = EINVAL; 1769 break; 1770 } 1771 im6o->im6o_multicast_loop = loop; 1772 break; 1773 1774 case IPV6_JOIN_GROUP: 1775 /* 1776 * Add a multicast group membership. 1777 * Group must be a valid IP6 multicast address. 1778 */ 1779 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1780 error = EINVAL; 1781 break; 1782 } 1783 mreq = mtod(m, struct ipv6_mreq *); 1784 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1785 /* 1786 * We use the unspecified address to specify to accept 1787 * all multicast addresses. Only super user is allowed 1788 * to do this. 1789 */ 1790 if (suser(p->p_ucred, &p->p_acflag)) 1791 { 1792 error = EACCES; 1793 break; 1794 } 1795 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1796 error = EINVAL; 1797 break; 1798 } 1799 1800 /* 1801 * If the interface is specified, validate it. 1802 */ 1803 if (mreq->ipv6mr_interface < 0 || 1804 if_indexlim <= mreq->ipv6mr_interface || 1805 !ifindex2ifnet[mreq->ipv6mr_interface]) { 1806 error = ENXIO; /* XXX EINVAL? */ 1807 break; 1808 } 1809 /* 1810 * If no interface was explicitly specified, choose an 1811 * appropriate one according to the given multicast address. 1812 */ 1813 if (mreq->ipv6mr_interface == 0) { 1814 /* 1815 * If the multicast address is in node-local scope, 1816 * the interface should be a loopback interface. 1817 * Otherwise, look up the routing table for the 1818 * address, and choose the outgoing interface. 1819 * XXX: is it a good approach? 1820 */ 1821 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1822 ifp = &loif[0]; 1823 } else { 1824 ro.ro_rt = NULL; 1825 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1826 bzero(dst, sizeof(*dst)); 1827 dst->sin6_len = sizeof(struct sockaddr_in6); 1828 dst->sin6_family = AF_INET6; 1829 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1830 rtalloc((struct route *)&ro); 1831 if (ro.ro_rt == NULL) { 1832 error = EADDRNOTAVAIL; 1833 break; 1834 } 1835 ifp = ro.ro_rt->rt_ifp; 1836 rtfree(ro.ro_rt); 1837 } 1838 } else 1839 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1840 1841 /* 1842 * See if we found an interface, and confirm that it 1843 * supports multicast 1844 */ 1845 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1846 error = EADDRNOTAVAIL; 1847 break; 1848 } 1849 /* 1850 * Put interface index into the multicast address, 1851 * if the address has link-local scope. 1852 */ 1853 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1854 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1855 htons(ifp->if_index); 1856 } 1857 /* 1858 * See if the membership already exists. 1859 */ 1860 for (imm = im6o->im6o_memberships.lh_first; 1861 imm != NULL; imm = imm->i6mm_chain.le_next) 1862 if (imm->i6mm_maddr->in6m_ifp == ifp && 1863 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1864 &mreq->ipv6mr_multiaddr)) 1865 break; 1866 if (imm != NULL) { 1867 error = EADDRINUSE; 1868 break; 1869 } 1870 /* 1871 * Everything looks good; add a new record to the multicast 1872 * address list for the given interface. 1873 */ 1874 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1875 if (!imm) 1876 break; 1877 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1878 break; 1879 1880 case IPV6_LEAVE_GROUP: 1881 /* 1882 * Drop a multicast group membership. 1883 * Group must be a valid IP6 multicast address. 1884 */ 1885 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1886 error = EINVAL; 1887 break; 1888 } 1889 mreq = mtod(m, struct ipv6_mreq *); 1890 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1891 if (suser(p->p_ucred, &p->p_acflag)) 1892 { 1893 error = EACCES; 1894 break; 1895 } 1896 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1897 error = EINVAL; 1898 break; 1899 } 1900 /* 1901 * If an interface address was specified, get a pointer 1902 * to its ifnet structure. 1903 */ 1904 if (mreq->ipv6mr_interface < 0 || 1905 if_indexlim <= mreq->ipv6mr_interface || 1906 !ifindex2ifnet[mreq->ipv6mr_interface]) { 1907 error = ENXIO; /* XXX EINVAL? */ 1908 break; 1909 } 1910 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1911 /* 1912 * Put interface index into the multicast address, 1913 * if the address has link-local scope. 1914 */ 1915 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1916 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1917 htons(mreq->ipv6mr_interface); 1918 } 1919 /* 1920 * Find the membership in the membership list. 1921 */ 1922 for (imm = im6o->im6o_memberships.lh_first; 1923 imm != NULL; imm = imm->i6mm_chain.le_next) { 1924 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 1925 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1926 &mreq->ipv6mr_multiaddr)) 1927 break; 1928 } 1929 if (imm == NULL) { 1930 /* Unable to resolve interface */ 1931 error = EADDRNOTAVAIL; 1932 break; 1933 } 1934 /* 1935 * Give up the multicast address record to which the 1936 * membership points. 1937 */ 1938 LIST_REMOVE(imm, i6mm_chain); 1939 in6_leavegroup(imm); 1940 break; 1941 1942 default: 1943 error = EOPNOTSUPP; 1944 break; 1945 } 1946 1947 /* 1948 * If all options have default values, no need to keep the mbuf. 1949 */ 1950 if (im6o->im6o_multicast_ifp == NULL && 1951 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1952 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1953 im6o->im6o_memberships.lh_first == NULL) { 1954 free(*im6op, M_IPMOPTS); 1955 *im6op = NULL; 1956 } 1957 1958 return (error); 1959 } 1960 1961 /* 1962 * Return the IP6 multicast options in response to user getsockopt(). 1963 */ 1964 static int 1965 ip6_getmoptions(optname, im6o, mp) 1966 int optname; 1967 struct ip6_moptions *im6o; 1968 struct mbuf **mp; 1969 { 1970 u_int *hlim, *loop, *ifindex; 1971 1972 *mp = m_get(M_WAIT, MT_SOOPTS); 1973 1974 switch (optname) { 1975 1976 case IPV6_MULTICAST_IF: 1977 ifindex = mtod(*mp, u_int *); 1978 (*mp)->m_len = sizeof(u_int); 1979 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1980 *ifindex = 0; 1981 else 1982 *ifindex = im6o->im6o_multicast_ifp->if_index; 1983 return (0); 1984 1985 case IPV6_MULTICAST_HOPS: 1986 hlim = mtod(*mp, u_int *); 1987 (*mp)->m_len = sizeof(u_int); 1988 if (im6o == NULL) 1989 *hlim = ip6_defmcasthlim; 1990 else 1991 *hlim = im6o->im6o_multicast_hlim; 1992 return (0); 1993 1994 case IPV6_MULTICAST_LOOP: 1995 loop = mtod(*mp, u_int *); 1996 (*mp)->m_len = sizeof(u_int); 1997 if (im6o == NULL) 1998 *loop = ip6_defmcasthlim; 1999 else 2000 *loop = im6o->im6o_multicast_loop; 2001 return (0); 2002 2003 default: 2004 return (EOPNOTSUPP); 2005 } 2006 } 2007 2008 /* 2009 * Discard the IP6 multicast options. 2010 */ 2011 void 2012 ip6_freemoptions(im6o) 2013 struct ip6_moptions *im6o; 2014 { 2015 struct in6_multi_mship *imm; 2016 2017 if (im6o == NULL) 2018 return; 2019 2020 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2021 LIST_REMOVE(imm, i6mm_chain); 2022 in6_leavegroup(imm); 2023 } 2024 free(im6o, M_IPMOPTS); 2025 } 2026 2027 /* 2028 * Set IPv6 outgoing packet options based on advanced API. 2029 */ 2030 int 2031 ip6_setpktoptions(control, opt, priv) 2032 struct mbuf *control; 2033 struct ip6_pktopts *opt; 2034 int priv; 2035 { 2036 struct cmsghdr *cm = 0; 2037 2038 if (control == 0 || opt == 0) 2039 return (EINVAL); 2040 2041 bzero(opt, sizeof(*opt)); 2042 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2043 2044 /* 2045 * XXX: Currently, we assume all the optional information is stored 2046 * in a single mbuf. 2047 */ 2048 if (control->m_next) 2049 return (EINVAL); 2050 2051 opt->ip6po_m = control; 2052 2053 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2054 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2055 cm = mtod(control, struct cmsghdr *); 2056 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2057 return (EINVAL); 2058 if (cm->cmsg_level != IPPROTO_IPV6) 2059 continue; 2060 2061 switch (cm->cmsg_type) { 2062 case IPV6_PKTINFO: 2063 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2064 return (EINVAL); 2065 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2066 if (opt->ip6po_pktinfo->ipi6_ifindex && 2067 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2068 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2069 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2070 2071 if (opt->ip6po_pktinfo->ipi6_ifindex >= if_indexlim || 2072 opt->ip6po_pktinfo->ipi6_ifindex < 0) 2073 return (ENXIO); 2074 if (opt->ip6po_pktinfo->ipi6_ifindex > 0 && 2075 !ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]) 2076 return (ENXIO); 2077 2078 /* 2079 * Check if the requested source address is indeed a 2080 * unicast address assigned to the node, and can be 2081 * used as the packet's source address. 2082 */ 2083 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2084 struct ifaddr *ia; 2085 struct in6_ifaddr *ia6; 2086 struct sockaddr_in6 sin6; 2087 2088 bzero(&sin6, sizeof(sin6)); 2089 sin6.sin6_len = sizeof(sin6); 2090 sin6.sin6_family = AF_INET6; 2091 sin6.sin6_addr = 2092 opt->ip6po_pktinfo->ipi6_addr; 2093 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2094 if (ia == NULL || 2095 (opt->ip6po_pktinfo->ipi6_ifindex && 2096 (ia->ifa_ifp->if_index != 2097 opt->ip6po_pktinfo->ipi6_ifindex))) { 2098 return (EADDRNOTAVAIL); 2099 } 2100 ia6 = (struct in6_ifaddr *)ia; 2101 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2102 return (EADDRNOTAVAIL); 2103 } 2104 2105 /* 2106 * Check if the requested source address is 2107 * indeed a unicast address assigned to the 2108 * node. 2109 */ 2110 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2111 return (EADDRNOTAVAIL); 2112 } 2113 break; 2114 2115 case IPV6_HOPLIMIT: 2116 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2117 return (EINVAL); 2118 else { 2119 int t; 2120 2121 bcopy(CMSG_DATA(cm), &t, sizeof(t)); 2122 if (t < -1 || t > 255) 2123 return (EINVAL); 2124 opt->ip6po_hlim = t; 2125 } 2126 break; 2127 2128 case IPV6_NEXTHOP: 2129 if (!priv) 2130 return (EPERM); 2131 2132 /* check if cmsg_len is large enough for sa_len */ 2133 if (cm->cmsg_len < sizeof(u_char) || 2134 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2135 return (EINVAL); 2136 2137 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2138 2139 break; 2140 2141 case IPV6_HOPOPTS: 2142 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2143 return (EINVAL); 2144 else { 2145 struct ip6_hbh *t; 2146 2147 t = (struct ip6_hbh *)CMSG_DATA(cm); 2148 if (cm->cmsg_len != 2149 CMSG_LEN((t->ip6h_len + 1) << 3)) 2150 return (EINVAL); 2151 opt->ip6po_hbh = t; 2152 } 2153 break; 2154 2155 case IPV6_DSTOPTS: 2156 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2157 return (EINVAL); 2158 2159 /* 2160 * If there is no routing header yet, the destination 2161 * options header should be put on the 1st part. 2162 * Otherwise, the header should be on the 2nd part. 2163 * (See RFC 2460, section 4.1) 2164 */ 2165 if (opt->ip6po_rthdr == NULL) { 2166 struct ip6_dest *t; 2167 2168 t = (struct ip6_dest *)CMSG_DATA(cm); 2169 if (cm->cmsg_len != 2170 CMSG_LEN((t->ip6d_len + 1) << 3)); 2171 return (EINVAL); 2172 opt->ip6po_dest1 = t; 2173 } 2174 else { 2175 struct ip6_dest *t; 2176 2177 t = (struct ip6_dest *)CMSG_DATA(cm); 2178 if (cm->cmsg_len != 2179 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2180 return (EINVAL); 2181 opt->ip6po_dest2 = t; 2182 } 2183 break; 2184 2185 case IPV6_RTHDR: 2186 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2187 return (EINVAL); 2188 else { 2189 struct ip6_rthdr *t; 2190 2191 t = (struct ip6_rthdr *)CMSG_DATA(cm); 2192 if (cm->cmsg_len != 2193 CMSG_LEN((t->ip6r_len + 1) << 3)) 2194 return (EINVAL); 2195 switch (t->ip6r_type) { 2196 case IPV6_RTHDR_TYPE_0: 2197 if (t->ip6r_segleft == 0) 2198 return (EINVAL); 2199 break; 2200 default: 2201 return (EINVAL); 2202 } 2203 opt->ip6po_rthdr = t; 2204 } 2205 break; 2206 2207 default: 2208 return (ENOPROTOOPT); 2209 } 2210 } 2211 2212 return (0); 2213 } 2214 2215 /* 2216 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2217 * packet to the input queue of a specified interface. Note that this 2218 * calls the output routine of the loopback "driver", but with an interface 2219 * pointer that might NOT be &loif -- easier than replicating that code here. 2220 */ 2221 void 2222 ip6_mloopback(ifp, m, dst) 2223 struct ifnet *ifp; 2224 struct mbuf *m; 2225 struct sockaddr_in6 *dst; 2226 { 2227 struct mbuf *copym; 2228 struct ip6_hdr *ip6; 2229 2230 copym = m_copy(m, 0, M_COPYALL); 2231 if (copym == NULL) 2232 return; 2233 2234 /* 2235 * Make sure to deep-copy IPv6 header portion in case the data 2236 * is in an mbuf cluster, so that we can safely override the IPv6 2237 * header portion later. 2238 */ 2239 if ((copym->m_flags & M_EXT) != 0 || 2240 copym->m_len < sizeof(struct ip6_hdr)) { 2241 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2242 if (copym == NULL) 2243 return; 2244 } 2245 2246 #ifdef DIAGNOSTIC 2247 if (copym->m_len < sizeof(*ip6)) { 2248 m_freem(copym); 2249 return; 2250 } 2251 #endif 2252 2253 ip6 = mtod(copym, struct ip6_hdr *); 2254 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2255 ip6->ip6_src.s6_addr16[1] = 0; 2256 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2257 ip6->ip6_dst.s6_addr16[1] = 0; 2258 2259 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2260 } 2261 2262 /* 2263 * Chop IPv6 header off from the payload. 2264 */ 2265 static int 2266 ip6_splithdr(m, exthdrs) 2267 struct mbuf *m; 2268 struct ip6_exthdrs *exthdrs; 2269 { 2270 struct mbuf *mh; 2271 struct ip6_hdr *ip6; 2272 2273 ip6 = mtod(m, struct ip6_hdr *); 2274 if (m->m_len > sizeof(*ip6)) { 2275 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2276 if (mh == 0) { 2277 m_freem(m); 2278 return ENOBUFS; 2279 } 2280 M_COPY_PKTHDR(mh, m); 2281 MH_ALIGN(mh, sizeof(*ip6)); 2282 m_tag_delete_chain(m, NULL); 2283 m->m_flags &= ~M_PKTHDR; 2284 m->m_len -= sizeof(*ip6); 2285 m->m_data += sizeof(*ip6); 2286 mh->m_next = m; 2287 m = mh; 2288 m->m_len = sizeof(*ip6); 2289 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2290 } 2291 exthdrs->ip6e_ip6 = m; 2292 return 0; 2293 } 2294 2295 /* 2296 * Compute IPv6 extension header length. 2297 */ 2298 int 2299 ip6_optlen(in6p) 2300 struct in6pcb *in6p; 2301 { 2302 int len; 2303 2304 if (!in6p->in6p_outputopts) 2305 return 0; 2306 2307 len = 0; 2308 #define elen(x) \ 2309 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2310 2311 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2312 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2313 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2314 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2315 return len; 2316 #undef elen 2317 } 2318
Indexes created Tue Sep 23 14:10:03 GMT 2025