ip6_output.c revision 1.68
1 /* $NetBSD: ip6_output.c,v 1.68 2003/09/04 03:07:33 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 1.68 2003/09/04 03:07:33 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 struct in6_ifaddr *ia; 159 u_long mtu; 160 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 161 struct ip6_exthdrs exthdrs; 162 struct in6_addr finaldst; 163 struct route_in6 *ro_pmtu = NULL; 164 int hdrsplit = 0; 165 int needipsec = 0; 166 #ifdef IPSEC 167 int needipsectun = 0; 168 struct secpolicy *sp = NULL; 169 170 ip6 = mtod(m, struct ip6_hdr *); 171 #endif /* IPSEC */ 172 173 #define MAKE_EXTHDR(hp, mp) \ 174 do { \ 175 if (hp) { \ 176 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 177 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 178 ((eh)->ip6e_len + 1) << 3); \ 179 if (error) \ 180 goto freehdrs; \ 181 } \ 182 } while (/*CONSTCOND*/ 0) 183 184 bzero(&exthdrs, sizeof(exthdrs)); 185 if (opt) { 186 /* Hop-by-Hop options header */ 187 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 188 /* Destination options header(1st part) */ 189 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 190 /* Routing header */ 191 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 192 /* Destination options header(2nd part) */ 193 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 194 } 195 196 #ifdef IPSEC 197 /* get a security policy for this packet */ 198 if (so == NULL) 199 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 200 else 201 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 202 203 if (sp == NULL) { 204 ipsec6stat.out_inval++; 205 goto freehdrs; 206 } 207 208 error = 0; 209 210 /* check policy */ 211 switch (sp->policy) { 212 case IPSEC_POLICY_DISCARD: 213 /* 214 * This packet is just discarded. 215 */ 216 ipsec6stat.out_polvio++; 217 goto freehdrs; 218 219 case IPSEC_POLICY_BYPASS: 220 case IPSEC_POLICY_NONE: 221 /* no need to do IPsec. */ 222 needipsec = 0; 223 break; 224 225 case IPSEC_POLICY_IPSEC: 226 if (sp->req == NULL) { 227 /* XXX should be panic ? */ 228 printf("ip6_output: No IPsec request specified.\n"); 229 error = EINVAL; 230 goto freehdrs; 231 } 232 needipsec = 1; 233 break; 234 235 case IPSEC_POLICY_ENTRUST: 236 default: 237 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 238 } 239 #endif /* IPSEC */ 240 241 /* 242 * Calculate the total length of the extension header chain. 243 * Keep the length of the unfragmentable part for fragmentation. 244 */ 245 optlen = 0; 246 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 247 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 248 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 249 unfragpartlen = optlen + sizeof(struct ip6_hdr); 250 /* NOTE: we don't add AH/ESP length here. do that later. */ 251 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 252 253 /* 254 * If we need IPsec, or there is at least one extension header, 255 * separate IP6 header from the payload. 256 */ 257 if ((needipsec || optlen) && !hdrsplit) { 258 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 259 m = NULL; 260 goto freehdrs; 261 } 262 m = exthdrs.ip6e_ip6; 263 hdrsplit++; 264 } 265 266 /* adjust pointer */ 267 ip6 = mtod(m, struct ip6_hdr *); 268 269 /* adjust mbuf packet header length */ 270 m->m_pkthdr.len += optlen; 271 plen = m->m_pkthdr.len - sizeof(*ip6); 272 273 /* If this is a jumbo payload, insert a jumbo payload option. */ 274 if (plen > IPV6_MAXPACKET) { 275 if (!hdrsplit) { 276 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 277 m = NULL; 278 goto freehdrs; 279 } 280 m = exthdrs.ip6e_ip6; 281 hdrsplit++; 282 } 283 /* adjust pointer */ 284 ip6 = mtod(m, struct ip6_hdr *); 285 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 286 goto freehdrs; 287 ip6->ip6_plen = 0; 288 } else 289 ip6->ip6_plen = htons(plen); 290 291 /* 292 * Concatenate headers and fill in next header fields. 293 * Here we have, on "m" 294 * IPv6 payload 295 * and we insert headers accordingly. Finally, we should be getting: 296 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 297 * 298 * during the header composing process, "m" points to IPv6 header. 299 * "mprev" points to an extension header prior to esp. 300 */ 301 { 302 u_char *nexthdrp = &ip6->ip6_nxt; 303 struct mbuf *mprev = m; 304 305 /* 306 * we treat dest2 specially. this makes IPsec processing 307 * much easier. 308 * 309 * result: IPv6 dest2 payload 310 * m and mprev will point to IPv6 header. 311 */ 312 if (exthdrs.ip6e_dest2) { 313 if (!hdrsplit) 314 panic("assumption failed: hdr not split"); 315 exthdrs.ip6e_dest2->m_next = m->m_next; 316 m->m_next = exthdrs.ip6e_dest2; 317 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 318 ip6->ip6_nxt = IPPROTO_DSTOPTS; 319 } 320 321 #define MAKE_CHAIN(m, mp, p, i)\ 322 do {\ 323 if (m) {\ 324 if (!hdrsplit) \ 325 panic("assumption failed: hdr not split"); \ 326 *mtod((m), u_char *) = *(p);\ 327 *(p) = (i);\ 328 p = mtod((m), u_char *);\ 329 (m)->m_next = (mp)->m_next;\ 330 (mp)->m_next = (m);\ 331 (mp) = (m);\ 332 }\ 333 } while (/*CONSTCOND*/ 0) 334 /* 335 * result: IPv6 hbh dest1 rthdr dest2 payload 336 * m will point to IPv6 header. mprev will point to the 337 * extension header prior to dest2 (rthdr in the above case). 338 */ 339 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 340 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 341 IPPROTO_DSTOPTS); 342 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 343 IPPROTO_ROUTING); 344 345 #ifdef IPSEC 346 if (!needipsec) 347 goto skip_ipsec2; 348 349 /* 350 * pointers after IPsec headers are not valid any more. 351 * other pointers need a great care too. 352 * (IPsec routines should not mangle mbufs prior to AH/ESP) 353 */ 354 exthdrs.ip6e_dest2 = NULL; 355 356 { 357 struct ip6_rthdr *rh = NULL; 358 int segleft_org = 0; 359 struct ipsec_output_state state; 360 361 if (exthdrs.ip6e_rthdr) { 362 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 363 segleft_org = rh->ip6r_segleft; 364 rh->ip6r_segleft = 0; 365 } 366 367 bzero(&state, sizeof(state)); 368 state.m = m; 369 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 370 &needipsectun); 371 m = state.m; 372 if (error) { 373 /* mbuf is already reclaimed in ipsec6_output_trans. */ 374 m = NULL; 375 switch (error) { 376 case EHOSTUNREACH: 377 case ENETUNREACH: 378 case EMSGSIZE: 379 case ENOBUFS: 380 case ENOMEM: 381 break; 382 default: 383 printf("ip6_output (ipsec): error code %d\n", error); 384 /* FALLTHROUGH */ 385 case ENOENT: 386 /* don't show these error codes to the user */ 387 error = 0; 388 break; 389 } 390 goto bad; 391 } 392 if (exthdrs.ip6e_rthdr) { 393 /* ah6_output doesn't modify mbuf chain */ 394 rh->ip6r_segleft = segleft_org; 395 } 396 } 397 skip_ipsec2:; 398 #endif 399 } 400 401 /* 402 * If there is a routing header, replace destination address field 403 * with the first hop of the routing header. 404 */ 405 if (exthdrs.ip6e_rthdr) { 406 struct ip6_rthdr *rh; 407 struct ip6_rthdr0 *rh0; 408 struct in6_addr *addr; 409 410 rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 411 struct ip6_rthdr *)); 412 finaldst = ip6->ip6_dst; 413 switch (rh->ip6r_type) { 414 case IPV6_RTHDR_TYPE_0: 415 rh0 = (struct ip6_rthdr0 *)rh; 416 addr = (struct in6_addr *)(rh0 + 1); 417 ip6->ip6_dst = addr[0]; 418 bcopy(&addr[1], &addr[0], 419 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1)); 420 addr[rh0->ip6r0_segleft - 1] = finaldst; 421 break; 422 default: /* is it possible? */ 423 error = EINVAL; 424 goto bad; 425 } 426 } 427 428 /* Source address validation */ 429 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 430 (flags & IPV6_UNSPECSRC) == 0) { 431 error = EOPNOTSUPP; 432 ip6stat.ip6s_badscope++; 433 goto bad; 434 } 435 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 436 error = EOPNOTSUPP; 437 ip6stat.ip6s_badscope++; 438 goto bad; 439 } 440 441 ip6stat.ip6s_localout++; 442 443 /* 444 * Route packet. 445 */ 446 if (ro == 0) { 447 ro = &ip6route; 448 bzero((caddr_t)ro, sizeof(*ro)); 449 } 450 ro_pmtu = ro; 451 if (opt && opt->ip6po_rthdr) 452 ro = &opt->ip6po_route; 453 dst = (struct sockaddr_in6 *)&ro->ro_dst; 454 /* 455 * If there is a cached route, 456 * check that it is to the same destination 457 * and is still up. If not, free it and try again. 458 */ 459 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 460 dst->sin6_family != AF_INET6 || 461 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 462 RTFREE(ro->ro_rt); 463 ro->ro_rt = (struct rtentry *)0; 464 } 465 if (ro->ro_rt == 0) { 466 bzero(dst, sizeof(*dst)); 467 dst->sin6_family = AF_INET6; 468 dst->sin6_len = sizeof(struct sockaddr_in6); 469 dst->sin6_addr = ip6->ip6_dst; 470 } 471 #ifdef IPSEC 472 if (needipsec && needipsectun) { 473 struct ipsec_output_state state; 474 475 /* 476 * All the extension headers will become inaccessible 477 * (since they can be encrypted). 478 * Don't panic, we need no more updates to extension headers 479 * on inner IPv6 packet (since they are now encapsulated). 480 * 481 * IPv6 [ESP|AH] IPv6 [extension headers] payload 482 */ 483 bzero(&exthdrs, sizeof(exthdrs)); 484 exthdrs.ip6e_ip6 = m; 485 486 bzero(&state, sizeof(state)); 487 state.m = m; 488 state.ro = (struct route *)ro; 489 state.dst = (struct sockaddr *)dst; 490 491 error = ipsec6_output_tunnel(&state, sp, flags); 492 493 m = state.m; 494 ro = (struct route_in6 *)state.ro; 495 dst = (struct sockaddr_in6 *)state.dst; 496 if (error) { 497 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 498 m0 = m = NULL; 499 m = NULL; 500 switch (error) { 501 case EHOSTUNREACH: 502 case ENETUNREACH: 503 case EMSGSIZE: 504 case ENOBUFS: 505 case ENOMEM: 506 break; 507 default: 508 printf("ip6_output (ipsec): error code %d\n", error); 509 /* FALLTHROUGH */ 510 case ENOENT: 511 /* don't show these error codes to the user */ 512 error = 0; 513 break; 514 } 515 goto bad; 516 } 517 518 exthdrs.ip6e_ip6 = m; 519 } 520 #endif /* IPSEC */ 521 522 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 523 /* Unicast */ 524 525 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 526 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 527 /* xxx 528 * interface selection comes here 529 * if an interface is specified from an upper layer, 530 * ifp must point it. 531 */ 532 if (ro->ro_rt == 0) { 533 /* 534 * non-bsdi always clone routes, if parent is 535 * PRF_CLONING. 536 */ 537 rtalloc((struct route *)ro); 538 } 539 if (ro->ro_rt == 0) { 540 ip6stat.ip6s_noroute++; 541 error = EHOSTUNREACH; 542 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 543 goto bad; 544 } 545 ia = ifatoia6(ro->ro_rt->rt_ifa); 546 ifp = ro->ro_rt->rt_ifp; 547 ro->ro_rt->rt_use++; 548 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 549 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 550 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 551 552 in6_ifstat_inc(ifp, ifs6_out_request); 553 554 /* 555 * Check if the outgoing interface conflicts with 556 * the interface specified by ifi6_ifindex (if specified). 557 * Note that loopback interface is always okay. 558 * (this may happen when we are sending a packet to one of 559 * our own addresses.) 560 */ 561 if (opt && opt->ip6po_pktinfo 562 && opt->ip6po_pktinfo->ipi6_ifindex) { 563 if (!(ifp->if_flags & IFF_LOOPBACK) 564 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 565 ip6stat.ip6s_noroute++; 566 in6_ifstat_inc(ifp, ifs6_out_discard); 567 error = EHOSTUNREACH; 568 goto bad; 569 } 570 } 571 572 if (opt && opt->ip6po_hlim != -1) 573 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 574 } else { 575 /* Multicast */ 576 struct in6_multi *in6m; 577 578 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 579 580 /* 581 * See if the caller provided any multicast options 582 */ 583 ifp = NULL; 584 if (im6o != NULL) { 585 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 586 if (im6o->im6o_multicast_ifp != NULL) 587 ifp = im6o->im6o_multicast_ifp; 588 } else 589 ip6->ip6_hlim = ip6_defmcasthlim; 590 591 /* 592 * See if the caller provided the outgoing interface 593 * as an ancillary data. 594 * Boundary check for ifindex is assumed to be already done. 595 */ 596 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 597 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 598 599 /* 600 * If the destination is a node-local scope multicast, 601 * the packet should be loop-backed only. 602 */ 603 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 604 /* 605 * If the outgoing interface is already specified, 606 * it should be a loopback interface. 607 */ 608 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 609 ip6stat.ip6s_badscope++; 610 error = ENETUNREACH; /* XXX: better error? */ 611 /* XXX correct ifp? */ 612 in6_ifstat_inc(ifp, ifs6_out_discard); 613 goto bad; 614 } else { 615 ifp = &loif[0]; 616 } 617 } 618 619 if (opt && opt->ip6po_hlim != -1) 620 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 621 622 /* 623 * If caller did not provide an interface lookup a 624 * default in the routing table. This is either a 625 * default for the speicfied group (i.e. a host 626 * route), or a multicast default (a route for the 627 * ``net'' ff00::/8). 628 */ 629 if (ifp == NULL) { 630 if (ro->ro_rt == 0) { 631 ro->ro_rt = rtalloc1((struct sockaddr *) 632 &ro->ro_dst, 0); 633 } 634 if (ro->ro_rt == 0) { 635 ip6stat.ip6s_noroute++; 636 error = EHOSTUNREACH; 637 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 638 goto bad; 639 } 640 ia = ifatoia6(ro->ro_rt->rt_ifa); 641 ifp = ro->ro_rt->rt_ifp; 642 ro->ro_rt->rt_use++; 643 } 644 645 if ((flags & IPV6_FORWARDING) == 0) 646 in6_ifstat_inc(ifp, ifs6_out_request); 647 in6_ifstat_inc(ifp, ifs6_out_mcast); 648 649 /* 650 * Confirm that the outgoing interface supports multicast. 651 */ 652 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 653 ip6stat.ip6s_noroute++; 654 in6_ifstat_inc(ifp, ifs6_out_discard); 655 error = ENETUNREACH; 656 goto bad; 657 } 658 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 659 if (in6m != NULL && 660 (im6o == NULL || im6o->im6o_multicast_loop)) { 661 /* 662 * If we belong to the destination multicast group 663 * on the outgoing interface, and the caller did not 664 * forbid loopback, loop back a copy. 665 */ 666 ip6_mloopback(ifp, m, dst); 667 } else { 668 /* 669 * If we are acting as a multicast router, perform 670 * multicast forwarding as if the packet had just 671 * arrived on the interface to which we are about 672 * to send. The multicast forwarding function 673 * recursively calls this function, using the 674 * IPV6_FORWARDING flag to prevent infinite recursion. 675 * 676 * Multicasts that are looped back by ip6_mloopback(), 677 * above, will be forwarded by the ip6_input() routine, 678 * if necessary. 679 */ 680 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 681 if (ip6_mforward(ip6, ifp, m) != 0) { 682 m_freem(m); 683 goto done; 684 } 685 } 686 } 687 /* 688 * Multicasts with a hoplimit of zero may be looped back, 689 * above, but must not be transmitted on a network. 690 * Also, multicasts addressed to the loopback interface 691 * are not sent -- the above call to ip6_mloopback() will 692 * loop back a copy if this host actually belongs to the 693 * destination group on the loopback interface. 694 */ 695 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 696 m_freem(m); 697 goto done; 698 } 699 } 700 701 /* 702 * Fill the outgoing inteface to tell the upper layer 703 * to increment per-interface statistics. 704 */ 705 if (ifpp) 706 *ifpp = ifp; 707 708 /* Determine path MTU. */ 709 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu)) != 0) 710 goto bad; 711 712 /* 713 * The caller of this function may specify to use the minimum MTU 714 * in some cases. 715 */ 716 if (mtu > IPV6_MMTU) { 717 if ((flags & IPV6_MINMTU)) 718 mtu = IPV6_MMTU; 719 } 720 721 /* Fake scoped addresses */ 722 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 723 /* 724 * If source or destination address is a scoped address, and 725 * the packet is going to be sent to a loopback interface, 726 * we should keep the original interface. 727 */ 728 729 /* 730 * XXX: this is a very experimental and temporary solution. 731 * We eventually have sockaddr_in6 and use the sin6_scope_id 732 * field of the structure here. 733 * We rely on the consistency between two scope zone ids 734 * of source add destination, which should already be assured 735 * Larger scopes than link will be supported in the near 736 * future. 737 */ 738 origifp = NULL; 739 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 740 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 741 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 742 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 743 /* 744 * XXX: origifp can be NULL even in those two cases above. 745 * For example, if we remove the (only) link-local address 746 * from the loopback interface, and try to send a link-local 747 * address without link-id information. Then the source 748 * address is ::1, and the destination address is the 749 * link-local address with its s6_addr16[1] being zero. 750 * What is worse, if the packet goes to the loopback interface 751 * by a default rejected route, the null pointer would be 752 * passed to looutput, and the kernel would hang. 753 * The following last resort would prevent such disaster. 754 */ 755 if (origifp == NULL) 756 origifp = ifp; 757 } else 758 origifp = ifp; 759 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 760 ip6->ip6_src.s6_addr16[1] = 0; 761 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 762 ip6->ip6_dst.s6_addr16[1] = 0; 763 764 /* 765 * If the outgoing packet contains a hop-by-hop options header, 766 * it must be examined and processed even by the source node. 767 * (RFC 2460, section 4.) 768 */ 769 if (exthdrs.ip6e_hbh) { 770 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 771 u_int32_t dummy1; /* XXX unused */ 772 u_int32_t dummy2; /* XXX unused */ 773 774 /* 775 * XXX: if we have to send an ICMPv6 error to the sender, 776 * we need the M_LOOP flag since icmp6_error() expects 777 * the IPv6 and the hop-by-hop options header are 778 * continuous unless the flag is set. 779 */ 780 m->m_flags |= M_LOOP; 781 m->m_pkthdr.rcvif = ifp; 782 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 783 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 784 &dummy1, &dummy2) < 0) { 785 /* m was already freed at this point */ 786 error = EINVAL;/* better error? */ 787 goto done; 788 } 789 m->m_flags &= ~M_LOOP; /* XXX */ 790 m->m_pkthdr.rcvif = NULL; 791 } 792 793 #ifdef PFIL_HOOKS 794 /* 795 * Run through list of hooks for output packets. 796 */ 797 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT)) != 0) 798 goto done; 799 if (m == NULL) 800 goto done; 801 ip6 = mtod(m, struct ip6_hdr *); 802 #endif /* PFIL_HOOKS */ 803 /* 804 * Send the packet to the outgoing interface. 805 * If necessary, do IPv6 fragmentation before sending. 806 */ 807 tlen = m->m_pkthdr.len; 808 if (tlen <= mtu) { 809 #ifdef IFA_STATS 810 struct in6_ifaddr *ia6; 811 ip6 = mtod(m, struct ip6_hdr *); 812 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 813 if (ia6) { 814 /* Record statistics for this interface address. */ 815 ia6->ia_ifa.ifa_data.ifad_outbytes += 816 m->m_pkthdr.len; 817 } 818 #endif 819 #ifdef IPSEC 820 /* clean ipsec history once it goes out of the node */ 821 ipsec_delaux(m); 822 #endif 823 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 824 goto done; 825 } else if (mtu < IPV6_MMTU) { 826 /* 827 * note that path MTU is never less than IPV6_MMTU 828 * (see icmp6_input). 829 */ 830 error = EMSGSIZE; 831 in6_ifstat_inc(ifp, ifs6_out_fragfail); 832 goto bad; 833 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 834 error = EMSGSIZE; 835 in6_ifstat_inc(ifp, ifs6_out_fragfail); 836 goto bad; 837 } else { 838 struct mbuf **mnext, *m_frgpart; 839 struct ip6_frag *ip6f; 840 u_int32_t id = htonl(ip6_id++); 841 u_char nextproto; 842 843 /* 844 * Too large for the destination or interface; 845 * fragment if possible. 846 * Must be able to put at least 8 bytes per fragment. 847 */ 848 hlen = unfragpartlen; 849 if (mtu > IPV6_MAXPACKET) 850 mtu = IPV6_MAXPACKET; 851 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 852 if (len < 8) { 853 error = EMSGSIZE; 854 in6_ifstat_inc(ifp, ifs6_out_fragfail); 855 goto bad; 856 } 857 858 mnext = &m->m_nextpkt; 859 860 /* 861 * Change the next header field of the last header in the 862 * unfragmentable part. 863 */ 864 if (exthdrs.ip6e_rthdr) { 865 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 866 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 867 } else if (exthdrs.ip6e_dest1) { 868 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 869 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 870 } else if (exthdrs.ip6e_hbh) { 871 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 872 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 873 } else { 874 nextproto = ip6->ip6_nxt; 875 ip6->ip6_nxt = IPPROTO_FRAGMENT; 876 } 877 878 /* 879 * Loop through length of segment after first fragment, 880 * make new header and copy data of each part and link onto 881 * chain. 882 */ 883 m0 = m; 884 for (off = hlen; off < tlen; off += len) { 885 struct mbuf *mlast; 886 887 MGETHDR(m, M_DONTWAIT, MT_HEADER); 888 if (!m) { 889 error = ENOBUFS; 890 ip6stat.ip6s_odropped++; 891 goto sendorfree; 892 } 893 m->m_flags = m0->m_flags & M_COPYFLAGS; 894 *mnext = m; 895 mnext = &m->m_nextpkt; 896 m->m_data += max_linkhdr; 897 mhip6 = mtod(m, struct ip6_hdr *); 898 *mhip6 = *ip6; 899 m->m_len = sizeof(*mhip6); 900 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 901 if (error) { 902 ip6stat.ip6s_odropped++; 903 goto sendorfree; 904 } 905 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 906 if (off + len >= tlen) 907 len = tlen - off; 908 else 909 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 910 mhip6->ip6_plen = htons((u_short)(len + hlen + 911 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 912 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 913 error = ENOBUFS; 914 ip6stat.ip6s_odropped++; 915 goto sendorfree; 916 } 917 for (mlast = m; mlast->m_next; mlast = mlast->m_next) 918 ; 919 mlast->m_next = m_frgpart; 920 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 921 m->m_pkthdr.rcvif = (struct ifnet *)0; 922 ip6f->ip6f_reserved = 0; 923 ip6f->ip6f_ident = id; 924 ip6f->ip6f_nxt = nextproto; 925 ip6stat.ip6s_ofragments++; 926 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 927 } 928 929 in6_ifstat_inc(ifp, ifs6_out_fragok); 930 } 931 932 /* 933 * Remove leading garbages. 934 */ 935 sendorfree: 936 m = m0->m_nextpkt; 937 m0->m_nextpkt = 0; 938 m_freem(m0); 939 for (m0 = m; m; m = m0) { 940 m0 = m->m_nextpkt; 941 m->m_nextpkt = 0; 942 if (error == 0) { 943 #ifdef IFA_STATS 944 struct in6_ifaddr *ia6; 945 ip6 = mtod(m, struct ip6_hdr *); 946 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 947 if (ia6) { 948 /* 949 * Record statistics for this interface 950 * address. 951 */ 952 ia6->ia_ifa.ifa_data.ifad_outbytes += 953 m->m_pkthdr.len; 954 } 955 #endif 956 #ifdef IPSEC 957 /* clean ipsec history once it goes out of the node */ 958 ipsec_delaux(m); 959 #endif 960 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 961 } else 962 m_freem(m); 963 } 964 965 if (error == 0) 966 ip6stat.ip6s_fragmented++; 967 968 done: 969 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 970 RTFREE(ro->ro_rt); 971 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 972 RTFREE(ro_pmtu->ro_rt); 973 } 974 975 #ifdef IPSEC 976 if (sp != NULL) 977 key_freesp(sp); 978 #endif /* IPSEC */ 979 980 return (error); 981 982 freehdrs: 983 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 984 m_freem(exthdrs.ip6e_dest1); 985 m_freem(exthdrs.ip6e_rthdr); 986 m_freem(exthdrs.ip6e_dest2); 987 /* FALLTHROUGH */ 988 bad: 989 m_freem(m); 990 goto done; 991 } 992 993 static int 994 ip6_copyexthdr(mp, hdr, hlen) 995 struct mbuf **mp; 996 caddr_t hdr; 997 int hlen; 998 { 999 struct mbuf *m; 1000 1001 if (hlen > MCLBYTES) 1002 return (ENOBUFS); /* XXX */ 1003 1004 MGET(m, M_DONTWAIT, MT_DATA); 1005 if (!m) 1006 return (ENOBUFS); 1007 1008 if (hlen > MLEN) { 1009 MCLGET(m, M_DONTWAIT); 1010 if ((m->m_flags & M_EXT) == 0) { 1011 m_free(m); 1012 return (ENOBUFS); 1013 } 1014 } 1015 m->m_len = hlen; 1016 if (hdr) 1017 bcopy(hdr, mtod(m, caddr_t), hlen); 1018 1019 *mp = m; 1020 return (0); 1021 } 1022 1023 /* 1024 * Insert jumbo payload option. 1025 */ 1026 static int 1027 ip6_insert_jumboopt(exthdrs, plen) 1028 struct ip6_exthdrs *exthdrs; 1029 u_int32_t plen; 1030 { 1031 struct mbuf *mopt; 1032 u_int8_t *optbuf; 1033 u_int32_t v; 1034 1035 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1036 1037 /* 1038 * If there is no hop-by-hop options header, allocate new one. 1039 * If there is one but it doesn't have enough space to store the 1040 * jumbo payload option, allocate a cluster to store the whole options. 1041 * Otherwise, use it to store the options. 1042 */ 1043 if (exthdrs->ip6e_hbh == 0) { 1044 MGET(mopt, M_DONTWAIT, MT_DATA); 1045 if (mopt == 0) 1046 return (ENOBUFS); 1047 mopt->m_len = JUMBOOPTLEN; 1048 optbuf = mtod(mopt, u_int8_t *); 1049 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1050 exthdrs->ip6e_hbh = mopt; 1051 } else { 1052 struct ip6_hbh *hbh; 1053 1054 mopt = exthdrs->ip6e_hbh; 1055 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1056 /* 1057 * XXX assumption: 1058 * - exthdrs->ip6e_hbh is not referenced from places 1059 * other than exthdrs. 1060 * - exthdrs->ip6e_hbh is not an mbuf chain. 1061 */ 1062 int oldoptlen = mopt->m_len; 1063 struct mbuf *n; 1064 1065 /* 1066 * XXX: give up if the whole (new) hbh header does 1067 * not fit even in an mbuf cluster. 1068 */ 1069 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1070 return (ENOBUFS); 1071 1072 /* 1073 * As a consequence, we must always prepare a cluster 1074 * at this point. 1075 */ 1076 MGET(n, M_DONTWAIT, MT_DATA); 1077 if (n) { 1078 MCLGET(n, M_DONTWAIT); 1079 if ((n->m_flags & M_EXT) == 0) { 1080 m_freem(n); 1081 n = NULL; 1082 } 1083 } 1084 if (!n) 1085 return (ENOBUFS); 1086 n->m_len = oldoptlen + JUMBOOPTLEN; 1087 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1088 oldoptlen); 1089 optbuf = mtod(n, u_int8_t *) + oldoptlen; 1090 m_freem(mopt); 1091 mopt = exthdrs->ip6e_hbh = n; 1092 } else { 1093 optbuf = mtod(mopt, u_int8_t *) + mopt->m_len; 1094 mopt->m_len += JUMBOOPTLEN; 1095 } 1096 optbuf[0] = IP6OPT_PADN; 1097 optbuf[1] = 0; 1098 1099 /* 1100 * Adjust the header length according to the pad and 1101 * the jumbo payload option. 1102 */ 1103 hbh = mtod(mopt, struct ip6_hbh *); 1104 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1105 } 1106 1107 /* fill in the option. */ 1108 optbuf[2] = IP6OPT_JUMBO; 1109 optbuf[3] = 4; 1110 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1111 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1112 1113 /* finally, adjust the packet header length */ 1114 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1115 1116 return (0); 1117 #undef JUMBOOPTLEN 1118 } 1119 1120 /* 1121 * Insert fragment header and copy unfragmentable header portions. 1122 */ 1123 static int 1124 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1125 struct mbuf *m0, *m; 1126 int hlen; 1127 struct ip6_frag **frghdrp; 1128 { 1129 struct mbuf *n, *mlast; 1130 1131 if (hlen > sizeof(struct ip6_hdr)) { 1132 n = m_copym(m0, sizeof(struct ip6_hdr), 1133 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1134 if (n == 0) 1135 return (ENOBUFS); 1136 m->m_next = n; 1137 } else 1138 n = m; 1139 1140 /* Search for the last mbuf of unfragmentable part. */ 1141 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1142 ; 1143 1144 if ((mlast->m_flags & M_EXT) == 0 && 1145 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1146 /* use the trailing space of the last mbuf for the fragment hdr */ 1147 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1148 mlast->m_len); 1149 mlast->m_len += sizeof(struct ip6_frag); 1150 m->m_pkthdr.len += sizeof(struct ip6_frag); 1151 } else { 1152 /* allocate a new mbuf for the fragment header */ 1153 struct mbuf *mfrg; 1154 1155 MGET(mfrg, M_DONTWAIT, MT_DATA); 1156 if (mfrg == 0) 1157 return (ENOBUFS); 1158 mfrg->m_len = sizeof(struct ip6_frag); 1159 *frghdrp = mtod(mfrg, struct ip6_frag *); 1160 mlast->m_next = mfrg; 1161 } 1162 1163 return (0); 1164 } 1165 1166 static int 1167 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup) 1168 struct route_in6 *ro_pmtu, *ro; 1169 struct ifnet *ifp; 1170 struct in6_addr *dst; 1171 u_long *mtup; 1172 { 1173 u_int32_t mtu = 0; 1174 int error = 0; 1175 1176 if (ro_pmtu != ro) { 1177 /* The first hop and the final destination may differ. */ 1178 struct sockaddr_in6 *sa6_dst = 1179 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1180 if (ro_pmtu->ro_rt && 1181 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1182 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1183 RTFREE(ro_pmtu->ro_rt); 1184 ro_pmtu->ro_rt = (struct rtentry *)0; 1185 } 1186 if (ro_pmtu->ro_rt == 0) { 1187 bzero(sa6_dst, sizeof(*sa6_dst)); 1188 sa6_dst->sin6_family = AF_INET6; 1189 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1190 sa6_dst->sin6_addr = *dst; 1191 1192 rtalloc((struct route *)ro_pmtu); 1193 } 1194 } 1195 if (ro_pmtu->ro_rt) { 1196 u_int32_t ifmtu; 1197 1198 if (ifp == NULL) 1199 ifp = ro_pmtu->ro_rt->rt_ifp; 1200 ifmtu = IN6_LINKMTU(ifp); 1201 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1202 if (mtu == 0) 1203 mtu = ifmtu; 1204 else if (mtu > ifmtu) { 1205 /* 1206 * The MTU on the route is larger than the MTU on 1207 * the interface! This shouldn't happen, unless the 1208 * MTU of the interface has been changed after the 1209 * interface was brought up. Change the MTU in the 1210 * route to match the interface MTU (as long as the 1211 * field isn't locked). 1212 * 1213 * if MTU on the route is 0, we need to fix the MTU. 1214 * this case happens with path MTU discovery timeouts. 1215 */ 1216 mtu = ifmtu; 1217 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1218 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1219 } 1220 } else if (ifp) { 1221 mtu = IN6_LINKMTU(ifp); 1222 } else 1223 error = EHOSTUNREACH; /* XXX */ 1224 1225 *mtup = mtu; 1226 return (error); 1227 } 1228 1229 /* 1230 * IP6 socket option processing. 1231 */ 1232 int 1233 ip6_ctloutput(op, so, level, optname, mp) 1234 int op; 1235 struct socket *so; 1236 int level, optname; 1237 struct mbuf **mp; 1238 { 1239 struct in6pcb *in6p = sotoin6pcb(so); 1240 struct mbuf *m = *mp; 1241 int optval = 0; 1242 int error = 0; 1243 struct proc *p = curproc; /* XXX */ 1244 1245 if (level == IPPROTO_IPV6) { 1246 switch (op) { 1247 case PRCO_SETOPT: 1248 switch (optname) { 1249 case IPV6_PKTOPTIONS: 1250 /* m is freed in ip6_pcbopts */ 1251 return (ip6_pcbopts(&in6p->in6p_outputopts, 1252 m, so)); 1253 case IPV6_HOPOPTS: 1254 case IPV6_DSTOPTS: 1255 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1256 error = EPERM; 1257 break; 1258 } 1259 /* FALLTHROUGH */ 1260 case IPV6_UNICAST_HOPS: 1261 case IPV6_RECVOPTS: 1262 case IPV6_RECVRETOPTS: 1263 case IPV6_RECVDSTADDR: 1264 case IPV6_PKTINFO: 1265 case IPV6_HOPLIMIT: 1266 case IPV6_RTHDR: 1267 case IPV6_FAITH: 1268 case IPV6_V6ONLY: 1269 if (!m || m->m_len != sizeof(int)) { 1270 error = EINVAL; 1271 break; 1272 } 1273 optval = *mtod(m, int *); 1274 switch (optname) { 1275 1276 case IPV6_UNICAST_HOPS: 1277 if (optval < -1 || optval >= 256) 1278 error = EINVAL; 1279 else { 1280 /* -1 = kernel default */ 1281 in6p->in6p_hops = optval; 1282 } 1283 break; 1284 #define OPTSET(bit) \ 1285 do { \ 1286 if (optval) \ 1287 in6p->in6p_flags |= (bit); \ 1288 else \ 1289 in6p->in6p_flags &= ~(bit); \ 1290 } while (/*CONSTCOND*/ 0) 1291 1292 case IPV6_RECVOPTS: 1293 OPTSET(IN6P_RECVOPTS); 1294 break; 1295 1296 case IPV6_RECVRETOPTS: 1297 OPTSET(IN6P_RECVRETOPTS); 1298 break; 1299 1300 case IPV6_RECVDSTADDR: 1301 OPTSET(IN6P_RECVDSTADDR); 1302 break; 1303 1304 case IPV6_PKTINFO: 1305 OPTSET(IN6P_PKTINFO); 1306 break; 1307 1308 case IPV6_HOPLIMIT: 1309 OPTSET(IN6P_HOPLIMIT); 1310 break; 1311 1312 case IPV6_HOPOPTS: 1313 OPTSET(IN6P_HOPOPTS); 1314 break; 1315 1316 case IPV6_DSTOPTS: 1317 OPTSET(IN6P_DSTOPTS); 1318 break; 1319 1320 case IPV6_RTHDR: 1321 OPTSET(IN6P_RTHDR); 1322 break; 1323 1324 case IPV6_FAITH: 1325 OPTSET(IN6P_FAITH); 1326 break; 1327 1328 case IPV6_V6ONLY: 1329 /* 1330 * make setsockopt(IPV6_V6ONLY) 1331 * available only prior to bind(2). 1332 * see ipng mailing list, Jun 22 2001. 1333 */ 1334 if (in6p->in6p_lport || 1335 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1336 error = EINVAL; 1337 break; 1338 } 1339 #ifdef INET6_BINDV6ONLY 1340 if (!optval) 1341 error = EINVAL; 1342 #else 1343 OPTSET(IN6P_IPV6_V6ONLY); 1344 #endif 1345 break; 1346 } 1347 break; 1348 #undef OPTSET 1349 1350 case IPV6_MULTICAST_IF: 1351 case IPV6_MULTICAST_HOPS: 1352 case IPV6_MULTICAST_LOOP: 1353 case IPV6_JOIN_GROUP: 1354 case IPV6_LEAVE_GROUP: 1355 error = ip6_setmoptions(optname, 1356 &in6p->in6p_moptions, m); 1357 break; 1358 1359 case IPV6_PORTRANGE: 1360 optval = *mtod(m, int *); 1361 1362 switch (optval) { 1363 case IPV6_PORTRANGE_DEFAULT: 1364 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1365 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1366 break; 1367 1368 case IPV6_PORTRANGE_HIGH: 1369 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1370 in6p->in6p_flags |= IN6P_HIGHPORT; 1371 break; 1372 1373 case IPV6_PORTRANGE_LOW: 1374 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1375 in6p->in6p_flags |= IN6P_LOWPORT; 1376 break; 1377 1378 default: 1379 error = EINVAL; 1380 break; 1381 } 1382 break; 1383 1384 #ifdef IPSEC 1385 case IPV6_IPSEC_POLICY: 1386 { 1387 caddr_t req = NULL; 1388 size_t len = 0; 1389 1390 int priv = 0; 1391 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1392 priv = 0; 1393 else 1394 priv = 1; 1395 if (m) { 1396 req = mtod(m, caddr_t); 1397 len = m->m_len; 1398 } 1399 error = ipsec6_set_policy(in6p, 1400 optname, req, len, priv); 1401 } 1402 break; 1403 #endif /* IPSEC */ 1404 1405 default: 1406 error = ENOPROTOOPT; 1407 break; 1408 } 1409 if (m) 1410 (void)m_free(m); 1411 break; 1412 1413 case PRCO_GETOPT: 1414 switch (optname) { 1415 1416 case IPV6_OPTIONS: 1417 case IPV6_RETOPTS: 1418 error = ENOPROTOOPT; 1419 break; 1420 1421 case IPV6_PKTOPTIONS: 1422 if (in6p->in6p_options) { 1423 *mp = m_copym(in6p->in6p_options, 0, 1424 M_COPYALL, M_WAIT); 1425 } else { 1426 *mp = m_get(M_WAIT, MT_SOOPTS); 1427 (*mp)->m_len = 0; 1428 } 1429 break; 1430 1431 case IPV6_HOPOPTS: 1432 case IPV6_DSTOPTS: 1433 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1434 error = EPERM; 1435 break; 1436 } 1437 /* FALLTHROUGH */ 1438 case IPV6_UNICAST_HOPS: 1439 case IPV6_RECVOPTS: 1440 case IPV6_RECVRETOPTS: 1441 case IPV6_RECVDSTADDR: 1442 case IPV6_PORTRANGE: 1443 case IPV6_PKTINFO: 1444 case IPV6_HOPLIMIT: 1445 case IPV6_RTHDR: 1446 case IPV6_FAITH: 1447 case IPV6_V6ONLY: 1448 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1449 m->m_len = sizeof(int); 1450 switch (optname) { 1451 1452 case IPV6_UNICAST_HOPS: 1453 optval = in6p->in6p_hops; 1454 break; 1455 1456 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1457 1458 case IPV6_RECVOPTS: 1459 optval = OPTBIT(IN6P_RECVOPTS); 1460 break; 1461 1462 case IPV6_RECVRETOPTS: 1463 optval = OPTBIT(IN6P_RECVRETOPTS); 1464 break; 1465 1466 case IPV6_RECVDSTADDR: 1467 optval = OPTBIT(IN6P_RECVDSTADDR); 1468 break; 1469 1470 case IPV6_PORTRANGE: 1471 { 1472 int flags; 1473 flags = in6p->in6p_flags; 1474 if (flags & IN6P_HIGHPORT) 1475 optval = IPV6_PORTRANGE_HIGH; 1476 else if (flags & IN6P_LOWPORT) 1477 optval = IPV6_PORTRANGE_LOW; 1478 else 1479 optval = 0; 1480 break; 1481 } 1482 1483 case IPV6_PKTINFO: 1484 optval = OPTBIT(IN6P_PKTINFO); 1485 break; 1486 1487 case IPV6_HOPLIMIT: 1488 optval = OPTBIT(IN6P_HOPLIMIT); 1489 break; 1490 1491 case IPV6_HOPOPTS: 1492 optval = OPTBIT(IN6P_HOPOPTS); 1493 break; 1494 1495 case IPV6_DSTOPTS: 1496 optval = OPTBIT(IN6P_DSTOPTS); 1497 break; 1498 1499 case IPV6_RTHDR: 1500 optval = OPTBIT(IN6P_RTHDR); 1501 break; 1502 1503 case IPV6_FAITH: 1504 optval = OPTBIT(IN6P_FAITH); 1505 break; 1506 1507 case IPV6_V6ONLY: 1508 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1509 break; 1510 } 1511 *mtod(m, int *) = optval; 1512 break; 1513 1514 case IPV6_MULTICAST_IF: 1515 case IPV6_MULTICAST_HOPS: 1516 case IPV6_MULTICAST_LOOP: 1517 case IPV6_JOIN_GROUP: 1518 case IPV6_LEAVE_GROUP: 1519 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1520 break; 1521 1522 #ifdef IPSEC 1523 case IPV6_IPSEC_POLICY: 1524 { 1525 caddr_t req = NULL; 1526 size_t len = 0; 1527 1528 if (m) { 1529 req = mtod(m, caddr_t); 1530 len = m->m_len; 1531 } 1532 error = ipsec6_get_policy(in6p, req, len, mp); 1533 break; 1534 } 1535 #endif /* IPSEC */ 1536 1537 default: 1538 error = ENOPROTOOPT; 1539 break; 1540 } 1541 break; 1542 } 1543 } else { 1544 error = EINVAL; 1545 if (op == PRCO_SETOPT && *mp) 1546 (void)m_free(*mp); 1547 } 1548 return (error); 1549 } 1550 1551 int 1552 ip6_raw_ctloutput(op, so, level, optname, mp) 1553 int op; 1554 struct socket *so; 1555 int level, optname; 1556 struct mbuf **mp; 1557 { 1558 int error = 0, optval, optlen; 1559 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 1560 struct in6pcb *in6p = sotoin6pcb(so); 1561 struct mbuf *m = *mp; 1562 1563 optlen = m ? m->m_len : 0; 1564 1565 if (level != IPPROTO_IPV6) { 1566 if (op == PRCO_SETOPT && *mp) 1567 (void)m_free(*mp); 1568 return (EINVAL); 1569 } 1570 1571 switch (optname) { 1572 case IPV6_CHECKSUM: 1573 /* 1574 * For ICMPv6 sockets, no modification allowed for checksum 1575 * offset, permit "no change" values to help existing apps. 1576 * 1577 * XXX 2292bis says: "An attempt to set IPV6_CHECKSUM 1578 * for an ICMPv6 socket will fail." 1579 * The current behavior does not meet 2292bis. 1580 */ 1581 switch (op) { 1582 case PRCO_SETOPT: 1583 if (optlen != sizeof(int)) { 1584 error = EINVAL; 1585 break; 1586 } 1587 optval = *mtod(m, int *); 1588 if ((optval % 2) != 0) { 1589 /* the API assumes even offset values */ 1590 error = EINVAL; 1591 } else if (so->so_proto->pr_protocol == 1592 IPPROTO_ICMPV6) { 1593 if (optval != icmp6off) 1594 error = EINVAL; 1595 } else 1596 in6p->in6p_cksum = optval; 1597 break; 1598 1599 case PRCO_GETOPT: 1600 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 1601 optval = icmp6off; 1602 else 1603 optval = in6p->in6p_cksum; 1604 1605 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1606 m->m_len = sizeof(int); 1607 *mtod(m, int *) = optval; 1608 break; 1609 1610 default: 1611 error = EINVAL; 1612 break; 1613 } 1614 break; 1615 1616 default: 1617 error = ENOPROTOOPT; 1618 break; 1619 } 1620 1621 if (op == PRCO_SETOPT && m) 1622 (void)m_free(m); 1623 1624 return (error); 1625 } 1626 1627 /* 1628 * Set up IP6 options in pcb for insertion in output packets. 1629 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1630 * with destination address if source routed. 1631 */ 1632 static int 1633 ip6_pcbopts(pktopt, m, so) 1634 struct ip6_pktopts **pktopt; 1635 struct mbuf *m; 1636 struct socket *so; 1637 { 1638 struct ip6_pktopts *opt = *pktopt; 1639 int error = 0; 1640 struct proc *p = curproc; /* XXX */ 1641 int priv = 0; 1642 1643 /* turn off any old options. */ 1644 if (opt) { 1645 if (opt->ip6po_m) 1646 (void)m_free(opt->ip6po_m); 1647 } else 1648 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1649 *pktopt = 0; 1650 1651 if (!m || m->m_len == 0) { 1652 /* 1653 * Only turning off any previous options. 1654 */ 1655 free(opt, M_IP6OPT); 1656 if (m) 1657 (void)m_free(m); 1658 return (0); 1659 } 1660 1661 /* set options specified by user. */ 1662 if (p && !suser(p->p_ucred, &p->p_acflag)) 1663 priv = 1; 1664 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1665 (void)m_free(m); 1666 free(opt, M_IP6OPT); 1667 return (error); 1668 } 1669 *pktopt = opt; 1670 return (0); 1671 } 1672 1673 /* 1674 * Set the IP6 multicast options in response to user setsockopt(). 1675 */ 1676 static int 1677 ip6_setmoptions(optname, im6op, m) 1678 int optname; 1679 struct ip6_moptions **im6op; 1680 struct mbuf *m; 1681 { 1682 int error = 0; 1683 u_int loop, ifindex; 1684 struct ipv6_mreq *mreq; 1685 struct ifnet *ifp; 1686 struct ip6_moptions *im6o = *im6op; 1687 struct route_in6 ro; 1688 struct sockaddr_in6 *dst; 1689 struct in6_multi_mship *imm; 1690 struct proc *p = curproc; /* XXX */ 1691 1692 if (im6o == NULL) { 1693 /* 1694 * No multicast option buffer attached to the pcb; 1695 * allocate one and initialize to default values. 1696 */ 1697 im6o = (struct ip6_moptions *) 1698 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1699 1700 if (im6o == NULL) 1701 return (ENOBUFS); 1702 *im6op = im6o; 1703 im6o->im6o_multicast_ifp = NULL; 1704 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1705 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1706 LIST_INIT(&im6o->im6o_memberships); 1707 } 1708 1709 switch (optname) { 1710 1711 case IPV6_MULTICAST_IF: 1712 /* 1713 * Select the interface for outgoing multicast packets. 1714 */ 1715 if (m == NULL || m->m_len != sizeof(u_int)) { 1716 error = EINVAL; 1717 break; 1718 } 1719 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1720 if (ifindex < 0 || if_index < ifindex) { 1721 error = ENXIO; /* XXX EINVAL? */ 1722 break; 1723 } 1724 ifp = ifindex2ifnet[ifindex]; 1725 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1726 error = EADDRNOTAVAIL; 1727 break; 1728 } 1729 im6o->im6o_multicast_ifp = ifp; 1730 break; 1731 1732 case IPV6_MULTICAST_HOPS: 1733 { 1734 /* 1735 * Set the IP6 hoplimit for outgoing multicast packets. 1736 */ 1737 int optval; 1738 if (m == NULL || m->m_len != sizeof(int)) { 1739 error = EINVAL; 1740 break; 1741 } 1742 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1743 if (optval < -1 || optval >= 256) 1744 error = EINVAL; 1745 else if (optval == -1) 1746 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1747 else 1748 im6o->im6o_multicast_hlim = optval; 1749 break; 1750 } 1751 1752 case IPV6_MULTICAST_LOOP: 1753 /* 1754 * Set the loopback flag for outgoing multicast packets. 1755 * Must be zero or one. 1756 */ 1757 if (m == NULL || m->m_len != sizeof(u_int)) { 1758 error = EINVAL; 1759 break; 1760 } 1761 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1762 if (loop > 1) { 1763 error = EINVAL; 1764 break; 1765 } 1766 im6o->im6o_multicast_loop = loop; 1767 break; 1768 1769 case IPV6_JOIN_GROUP: 1770 /* 1771 * Add a multicast group membership. 1772 * Group must be a valid IP6 multicast address. 1773 */ 1774 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1775 error = EINVAL; 1776 break; 1777 } 1778 mreq = mtod(m, struct ipv6_mreq *); 1779 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1780 /* 1781 * We use the unspecified address to specify to accept 1782 * all multicast addresses. Only super user is allowed 1783 * to do this. 1784 */ 1785 if (suser(p->p_ucred, &p->p_acflag)) 1786 { 1787 error = EACCES; 1788 break; 1789 } 1790 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1791 error = EINVAL; 1792 break; 1793 } 1794 1795 /* 1796 * If the interface is specified, validate it. 1797 */ 1798 if (mreq->ipv6mr_interface < 0 1799 || if_index < mreq->ipv6mr_interface) { 1800 error = ENXIO; /* XXX EINVAL? */ 1801 break; 1802 } 1803 /* 1804 * If no interface was explicitly specified, choose an 1805 * appropriate one according to the given multicast address. 1806 */ 1807 if (mreq->ipv6mr_interface == 0) { 1808 /* 1809 * If the multicast address is in node-local scope, 1810 * the interface should be a loopback interface. 1811 * Otherwise, look up the routing table for the 1812 * address, and choose the outgoing interface. 1813 * XXX: is it a good approach? 1814 */ 1815 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1816 ifp = &loif[0]; 1817 } else { 1818 ro.ro_rt = NULL; 1819 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1820 bzero(dst, sizeof(*dst)); 1821 dst->sin6_len = sizeof(struct sockaddr_in6); 1822 dst->sin6_family = AF_INET6; 1823 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1824 rtalloc((struct route *)&ro); 1825 if (ro.ro_rt == NULL) { 1826 error = EADDRNOTAVAIL; 1827 break; 1828 } 1829 ifp = ro.ro_rt->rt_ifp; 1830 rtfree(ro.ro_rt); 1831 } 1832 } else 1833 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1834 1835 /* 1836 * See if we found an interface, and confirm that it 1837 * supports multicast 1838 */ 1839 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1840 error = EADDRNOTAVAIL; 1841 break; 1842 } 1843 /* 1844 * Put interface index into the multicast address, 1845 * if the address has link-local scope. 1846 */ 1847 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1848 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1849 htons(mreq->ipv6mr_interface); 1850 } 1851 /* 1852 * See if the membership already exists. 1853 */ 1854 for (imm = im6o->im6o_memberships.lh_first; 1855 imm != NULL; imm = imm->i6mm_chain.le_next) 1856 if (imm->i6mm_maddr->in6m_ifp == ifp && 1857 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1858 &mreq->ipv6mr_multiaddr)) 1859 break; 1860 if (imm != NULL) { 1861 error = EADDRINUSE; 1862 break; 1863 } 1864 /* 1865 * Everything looks good; add a new record to the multicast 1866 * address list for the given interface. 1867 */ 1868 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error); 1869 if (!imm) 1870 break; 1871 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1872 break; 1873 1874 case IPV6_LEAVE_GROUP: 1875 /* 1876 * Drop a multicast group membership. 1877 * Group must be a valid IP6 multicast address. 1878 */ 1879 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1880 error = EINVAL; 1881 break; 1882 } 1883 mreq = mtod(m, struct ipv6_mreq *); 1884 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1885 if (suser(p->p_ucred, &p->p_acflag)) 1886 { 1887 error = EACCES; 1888 break; 1889 } 1890 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1891 error = EINVAL; 1892 break; 1893 } 1894 /* 1895 * If an interface address was specified, get a pointer 1896 * to its ifnet structure. 1897 */ 1898 if (mreq->ipv6mr_interface < 0 1899 || if_index < mreq->ipv6mr_interface) { 1900 error = ENXIO; /* XXX EINVAL? */ 1901 break; 1902 } 1903 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1904 /* 1905 * Put interface index into the multicast address, 1906 * if the address has link-local scope. 1907 */ 1908 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1909 mreq->ipv6mr_multiaddr.s6_addr16[1] = 1910 htons(mreq->ipv6mr_interface); 1911 } 1912 /* 1913 * Find the membership in the membership list. 1914 */ 1915 for (imm = im6o->im6o_memberships.lh_first; 1916 imm != NULL; imm = imm->i6mm_chain.le_next) { 1917 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 1918 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1919 &mreq->ipv6mr_multiaddr)) 1920 break; 1921 } 1922 if (imm == NULL) { 1923 /* Unable to resolve interface */ 1924 error = EADDRNOTAVAIL; 1925 break; 1926 } 1927 /* 1928 * Give up the multicast address record to which the 1929 * membership points. 1930 */ 1931 LIST_REMOVE(imm, i6mm_chain); 1932 in6_leavegroup(imm); 1933 break; 1934 1935 default: 1936 error = EOPNOTSUPP; 1937 break; 1938 } 1939 1940 /* 1941 * If all options have default values, no need to keep the mbuf. 1942 */ 1943 if (im6o->im6o_multicast_ifp == NULL && 1944 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1945 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1946 im6o->im6o_memberships.lh_first == NULL) { 1947 free(*im6op, M_IPMOPTS); 1948 *im6op = NULL; 1949 } 1950 1951 return (error); 1952 } 1953 1954 /* 1955 * Return the IP6 multicast options in response to user getsockopt(). 1956 */ 1957 static int 1958 ip6_getmoptions(optname, im6o, mp) 1959 int optname; 1960 struct ip6_moptions *im6o; 1961 struct mbuf **mp; 1962 { 1963 u_int *hlim, *loop, *ifindex; 1964 1965 *mp = m_get(M_WAIT, MT_SOOPTS); 1966 1967 switch (optname) { 1968 1969 case IPV6_MULTICAST_IF: 1970 ifindex = mtod(*mp, u_int *); 1971 (*mp)->m_len = sizeof(u_int); 1972 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1973 *ifindex = 0; 1974 else 1975 *ifindex = im6o->im6o_multicast_ifp->if_index; 1976 return (0); 1977 1978 case IPV6_MULTICAST_HOPS: 1979 hlim = mtod(*mp, u_int *); 1980 (*mp)->m_len = sizeof(u_int); 1981 if (im6o == NULL) 1982 *hlim = ip6_defmcasthlim; 1983 else 1984 *hlim = im6o->im6o_multicast_hlim; 1985 return (0); 1986 1987 case IPV6_MULTICAST_LOOP: 1988 loop = mtod(*mp, u_int *); 1989 (*mp)->m_len = sizeof(u_int); 1990 if (im6o == NULL) 1991 *loop = ip6_defmcasthlim; 1992 else 1993 *loop = im6o->im6o_multicast_loop; 1994 return (0); 1995 1996 default: 1997 return (EOPNOTSUPP); 1998 } 1999 } 2000 2001 /* 2002 * Discard the IP6 multicast options. 2003 */ 2004 void 2005 ip6_freemoptions(im6o) 2006 struct ip6_moptions *im6o; 2007 { 2008 struct in6_multi_mship *imm; 2009 2010 if (im6o == NULL) 2011 return; 2012 2013 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2014 LIST_REMOVE(imm, i6mm_chain); 2015 in6_leavegroup(imm); 2016 } 2017 free(im6o, M_IPMOPTS); 2018 } 2019 2020 /* 2021 * Set IPv6 outgoing packet options based on advanced API. 2022 */ 2023 int 2024 ip6_setpktoptions(control, opt, priv) 2025 struct mbuf *control; 2026 struct ip6_pktopts *opt; 2027 int priv; 2028 { 2029 struct cmsghdr *cm = 0; 2030 2031 if (control == 0 || opt == 0) 2032 return (EINVAL); 2033 2034 bzero(opt, sizeof(*opt)); 2035 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2036 2037 /* 2038 * XXX: Currently, we assume all the optional information is stored 2039 * in a single mbuf. 2040 */ 2041 if (control->m_next) 2042 return (EINVAL); 2043 2044 opt->ip6po_m = control; 2045 2046 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2047 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2048 cm = mtod(control, struct cmsghdr *); 2049 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2050 return (EINVAL); 2051 if (cm->cmsg_level != IPPROTO_IPV6) 2052 continue; 2053 2054 switch (cm->cmsg_type) { 2055 case IPV6_PKTINFO: 2056 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2057 return (EINVAL); 2058 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2059 if (opt->ip6po_pktinfo->ipi6_ifindex && 2060 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2061 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2062 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2063 2064 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index || 2065 opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2066 return (ENXIO); 2067 } 2068 2069 /* 2070 * Check if the requested source address is indeed a 2071 * unicast address assigned to the node, and can be 2072 * used as the packet's source address. 2073 */ 2074 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2075 struct ifaddr *ia; 2076 struct in6_ifaddr *ia6; 2077 struct sockaddr_in6 sin6; 2078 2079 bzero(&sin6, sizeof(sin6)); 2080 sin6.sin6_len = sizeof(sin6); 2081 sin6.sin6_family = AF_INET6; 2082 sin6.sin6_addr = 2083 opt->ip6po_pktinfo->ipi6_addr; 2084 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2085 if (ia == NULL || 2086 (opt->ip6po_pktinfo->ipi6_ifindex && 2087 (ia->ifa_ifp->if_index != 2088 opt->ip6po_pktinfo->ipi6_ifindex))) { 2089 return (EADDRNOTAVAIL); 2090 } 2091 ia6 = (struct in6_ifaddr *)ia; 2092 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2093 return (EADDRNOTAVAIL); 2094 } 2095 2096 /* 2097 * Check if the requested source address is 2098 * indeed a unicast address assigned to the 2099 * node. 2100 */ 2101 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2102 return (EADDRNOTAVAIL); 2103 } 2104 break; 2105 2106 case IPV6_HOPLIMIT: 2107 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2108 return (EINVAL); 2109 else { 2110 int t; 2111 2112 bcopy(CMSG_DATA(cm), &t, sizeof(t)); 2113 if (t < -1 || t > 255) 2114 return (EINVAL); 2115 opt->ip6po_hlim = t; 2116 } 2117 break; 2118 2119 case IPV6_NEXTHOP: 2120 if (!priv) 2121 return (EPERM); 2122 2123 /* check if cmsg_len is large enough for sa_len */ 2124 if (cm->cmsg_len < sizeof(u_char) || 2125 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2126 return (EINVAL); 2127 2128 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2129 2130 break; 2131 2132 case IPV6_HOPOPTS: 2133 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2134 return (EINVAL); 2135 else { 2136 struct ip6_hbh *t; 2137 2138 t = (struct ip6_hbh *)CMSG_DATA(cm); 2139 if (cm->cmsg_len != 2140 CMSG_LEN((t->ip6h_len + 1) << 3)) 2141 return (EINVAL); 2142 opt->ip6po_hbh = t; 2143 } 2144 break; 2145 2146 case IPV6_DSTOPTS: 2147 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2148 return (EINVAL); 2149 2150 /* 2151 * If there is no routing header yet, the destination 2152 * options header should be put on the 1st part. 2153 * Otherwise, the header should be on the 2nd part. 2154 * (See RFC 2460, section 4.1) 2155 */ 2156 if (opt->ip6po_rthdr == NULL) { 2157 struct ip6_dest *t; 2158 2159 t = (struct ip6_dest *)CMSG_DATA(cm); 2160 if (cm->cmsg_len != 2161 CMSG_LEN((t->ip6d_len + 1) << 3)); 2162 return (EINVAL); 2163 opt->ip6po_dest1 = t; 2164 } 2165 else { 2166 struct ip6_dest *t; 2167 2168 t = (struct ip6_dest *)CMSG_DATA(cm); 2169 if (cm->cmsg_len != 2170 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) << 3)) 2171 return (EINVAL); 2172 opt->ip6po_dest2 = t; 2173 } 2174 break; 2175 2176 case IPV6_RTHDR: 2177 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2178 return (EINVAL); 2179 else { 2180 struct ip6_rthdr *t; 2181 2182 t = (struct ip6_rthdr *)CMSG_DATA(cm); 2183 if (cm->cmsg_len != 2184 CMSG_LEN((t->ip6r_len + 1) << 3)) 2185 return (EINVAL); 2186 switch (t->ip6r_type) { 2187 case IPV6_RTHDR_TYPE_0: 2188 if (t->ip6r_segleft == 0) 2189 return (EINVAL); 2190 break; 2191 default: 2192 return (EINVAL); 2193 } 2194 opt->ip6po_rthdr = t; 2195 } 2196 break; 2197 2198 default: 2199 return (ENOPROTOOPT); 2200 } 2201 } 2202 2203 return (0); 2204 } 2205 2206 /* 2207 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2208 * packet to the input queue of a specified interface. Note that this 2209 * calls the output routine of the loopback "driver", but with an interface 2210 * pointer that might NOT be &loif -- easier than replicating that code here. 2211 */ 2212 void 2213 ip6_mloopback(ifp, m, dst) 2214 struct ifnet *ifp; 2215 struct mbuf *m; 2216 struct sockaddr_in6 *dst; 2217 { 2218 struct mbuf *copym; 2219 struct ip6_hdr *ip6; 2220 2221 copym = m_copy(m, 0, M_COPYALL); 2222 if (copym == NULL) 2223 return; 2224 2225 /* 2226 * Make sure to deep-copy IPv6 header portion in case the data 2227 * is in an mbuf cluster, so that we can safely override the IPv6 2228 * header portion later. 2229 */ 2230 if ((copym->m_flags & M_EXT) != 0 || 2231 copym->m_len < sizeof(struct ip6_hdr)) { 2232 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2233 if (copym == NULL) 2234 return; 2235 } 2236 2237 #ifdef DIAGNOSTIC 2238 if (copym->m_len < sizeof(*ip6)) { 2239 m_freem(copym); 2240 return; 2241 } 2242 #endif 2243 2244 ip6 = mtod(copym, struct ip6_hdr *); 2245 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2246 ip6->ip6_src.s6_addr16[1] = 0; 2247 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2248 ip6->ip6_dst.s6_addr16[1] = 0; 2249 2250 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2251 } 2252 2253 /* 2254 * Chop IPv6 header off from the payload. 2255 */ 2256 static int 2257 ip6_splithdr(m, exthdrs) 2258 struct mbuf *m; 2259 struct ip6_exthdrs *exthdrs; 2260 { 2261 struct mbuf *mh; 2262 struct ip6_hdr *ip6; 2263 2264 ip6 = mtod(m, struct ip6_hdr *); 2265 if (m->m_len > sizeof(*ip6)) { 2266 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2267 if (mh == 0) { 2268 m_freem(m); 2269 return ENOBUFS; 2270 } 2271 M_COPY_PKTHDR(mh, m); 2272 MH_ALIGN(mh, sizeof(*ip6)); 2273 m->m_flags &= ~M_PKTHDR; 2274 m->m_len -= sizeof(*ip6); 2275 m->m_data += sizeof(*ip6); 2276 mh->m_next = m; 2277 m = mh; 2278 m->m_len = sizeof(*ip6); 2279 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2280 } 2281 exthdrs->ip6e_ip6 = m; 2282 return 0; 2283 } 2284 2285 /* 2286 * Compute IPv6 extension header length. 2287 */ 2288 int 2289 ip6_optlen(in6p) 2290 struct in6pcb *in6p; 2291 { 2292 int len; 2293 2294 if (!in6p->in6p_outputopts) 2295 return 0; 2296 2297 len = 0; 2298 #define elen(x) \ 2299 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2300 2301 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2302 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2303 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2304 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2305 return len; 2306 #undef elen 2307 } 2308
Indexes created Sun Sep 21 20:09:37 GMT 2025