ip6_output.c revision 1.28
1 /* $NetBSD: ip6_output.c,v 1.28 2001/01/24 09:04:17 itojun Exp $ */ 2 /* $KAME: ip6_output.c,v 1.122 2000/08/19 02:12:02 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 #ifdef PFIL_HOOKS 85 #include <net/pfil.h> 86 #endif 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet6/in6_pcb.h> 94 #include <netinet6/nd6.h> 95 96 #ifdef IPSEC 97 #include <netinet6/ipsec.h> 98 #include <netkey/key.h> 99 #endif /* IPSEC */ 100 101 #include "loop.h" 102 103 #include <net/net_osdep.h> 104 105 #ifdef IPV6FIREWALL 106 #include <netinet6/ip6_fw.h> 107 #endif 108 109 #ifdef PFIL_HOOKS 110 extern struct pfil_head inet6_pfil_hook; /* XXX */ 111 #endif 112 113 struct ip6_exthdrs { 114 struct mbuf *ip6e_ip6; 115 struct mbuf *ip6e_hbh; 116 struct mbuf *ip6e_dest1; 117 struct mbuf *ip6e_rthdr; 118 struct mbuf *ip6e_dest2; 119 }; 120 121 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 122 struct socket *)); 123 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 124 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 125 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 126 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 127 struct ip6_frag **)); 128 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 129 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 130 131 extern struct ifnet loif[NLOOP]; 132 133 /* 134 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 135 * header (with pri, len, nxt, hlim, src, dst). 136 * This function may modify ver and hlim only. 137 * The mbuf chain containing the packet will be freed. 138 * The mbuf opt, if present, will not be freed. 139 */ 140 int 141 ip6_output(m0, opt, ro, flags, im6o, ifpp) 142 struct mbuf *m0; 143 struct ip6_pktopts *opt; 144 struct route_in6 *ro; 145 int flags; 146 struct ip6_moptions *im6o; 147 struct ifnet **ifpp; /* XXX: just for statistics */ 148 { 149 struct ip6_hdr *ip6, *mhip6; 150 struct ifnet *ifp, *origifp; 151 struct mbuf *m = m0; 152 int hlen, tlen, len, off; 153 struct route_in6 ip6route; 154 struct sockaddr_in6 *dst; 155 int error = 0; 156 struct in6_ifaddr *ia; 157 u_long mtu; 158 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 159 struct ip6_exthdrs exthdrs; 160 struct in6_addr finaldst; 161 struct route_in6 *ro_pmtu = NULL; 162 int hdrsplit = 0; 163 int needipsec = 0; 164 #ifdef IPSEC 165 int needipsectun = 0; 166 struct socket *so; 167 struct secpolicy *sp = NULL; 168 169 /* for AH processing. stupid to have "socket" variable in IP layer... */ 170 so = ipsec_getsocket(m); 171 (void)ipsec_setsocket(m, NULL); 172 ip6 = mtod(m, struct ip6_hdr *); 173 #endif /* IPSEC */ 174 175 #define MAKE_EXTHDR(hp, mp) \ 176 do { \ 177 if (hp) { \ 178 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 179 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 180 ((eh)->ip6e_len + 1) << 3); \ 181 if (error) \ 182 goto freehdrs; \ 183 } \ 184 } while (0) 185 186 bzero(&exthdrs, sizeof(exthdrs)); 187 if (opt) { 188 /* Hop-by-Hop options header */ 189 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 190 /* Destination options header(1st part) */ 191 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 192 /* Routing header */ 193 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 194 /* Destination options header(2nd part) */ 195 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 196 } 197 198 #ifdef IPSEC 199 /* get a security policy for this packet */ 200 if (so == NULL) 201 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 202 else 203 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 204 205 if (sp == NULL) { 206 ipsec6stat.out_inval++; 207 goto freehdrs; 208 } 209 210 error = 0; 211 212 /* check policy */ 213 switch (sp->policy) { 214 case IPSEC_POLICY_DISCARD: 215 /* 216 * This packet is just discarded. 217 */ 218 ipsec6stat.out_polvio++; 219 goto freehdrs; 220 221 case IPSEC_POLICY_BYPASS: 222 case IPSEC_POLICY_NONE: 223 /* no need to do IPsec. */ 224 needipsec = 0; 225 break; 226 227 case IPSEC_POLICY_IPSEC: 228 if (sp->req == NULL) { 229 /* XXX should be panic ? */ 230 printf("ip6_output: No IPsec request specified.\n"); 231 error = EINVAL; 232 goto freehdrs; 233 } 234 needipsec = 1; 235 break; 236 237 case IPSEC_POLICY_ENTRUST: 238 default: 239 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 240 } 241 #endif /* IPSEC */ 242 243 /* 244 * Calculate the total length of the extension header chain. 245 * Keep the length of the unfragmentable part for fragmentation. 246 */ 247 optlen = 0; 248 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 249 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 250 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 251 unfragpartlen = optlen + sizeof(struct ip6_hdr); 252 /* NOTE: we don't add AH/ESP length here. do that later. */ 253 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 254 255 /* 256 * If we need IPsec, or there is at least one extension header, 257 * separate IP6 header from the payload. 258 */ 259 if ((needipsec || optlen) && !hdrsplit) { 260 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 261 m = NULL; 262 goto freehdrs; 263 } 264 m = exthdrs.ip6e_ip6; 265 hdrsplit++; 266 } 267 268 /* adjust pointer */ 269 ip6 = mtod(m, struct ip6_hdr *); 270 271 /* adjust mbuf packet header length */ 272 m->m_pkthdr.len += optlen; 273 plen = m->m_pkthdr.len - sizeof(*ip6); 274 275 /* If this is a jumbo payload, insert a jumbo payload option. */ 276 if (plen > IPV6_MAXPACKET) { 277 if (!hdrsplit) { 278 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 279 m = NULL; 280 goto freehdrs; 281 } 282 m = exthdrs.ip6e_ip6; 283 hdrsplit++; 284 } 285 /* adjust pointer */ 286 ip6 = mtod(m, struct ip6_hdr *); 287 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 288 goto freehdrs; 289 ip6->ip6_plen = 0; 290 } else 291 ip6->ip6_plen = htons(plen); 292 293 /* 294 * Concatenate headers and fill in next header fields. 295 * Here we have, on "m" 296 * IPv6 payload 297 * and we insert headers accordingly. Finally, we should be getting: 298 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 299 * 300 * during the header composing process, "m" points to IPv6 header. 301 * "mprev" points to an extension header prior to esp. 302 */ 303 { 304 u_char *nexthdrp = &ip6->ip6_nxt; 305 struct mbuf *mprev = m; 306 307 /* 308 * we treat dest2 specially. this makes IPsec processing 309 * much easier. 310 * 311 * result: IPv6 dest2 payload 312 * m and mprev will point to IPv6 header. 313 */ 314 if (exthdrs.ip6e_dest2) { 315 if (!hdrsplit) 316 panic("assumption failed: hdr not split"); 317 exthdrs.ip6e_dest2->m_next = m->m_next; 318 m->m_next = exthdrs.ip6e_dest2; 319 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 320 ip6->ip6_nxt = IPPROTO_DSTOPTS; 321 } 322 323 #define MAKE_CHAIN(m, mp, p, i)\ 324 do {\ 325 if (m) {\ 326 if (!hdrsplit) \ 327 panic("assumption failed: hdr not split"); \ 328 *mtod((m), u_char *) = *(p);\ 329 *(p) = (i);\ 330 p = mtod((m), u_char *);\ 331 (m)->m_next = (mp)->m_next;\ 332 (mp)->m_next = (m);\ 333 (mp) = (m);\ 334 }\ 335 } while (0) 336 /* 337 * result: IPv6 hbh dest1 rthdr dest2 payload 338 * m will point to IPv6 header. mprev will point to the 339 * extension header prior to dest2 (rthdr in the above case). 340 */ 341 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 342 nexthdrp, IPPROTO_HOPOPTS); 343 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 344 nexthdrp, IPPROTO_DSTOPTS); 345 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 346 nexthdrp, IPPROTO_ROUTING); 347 348 #ifdef IPSEC 349 if (!needipsec) 350 goto skip_ipsec2; 351 352 /* 353 * pointers after IPsec headers are not valid any more. 354 * other pointers need a great care too. 355 * (IPsec routines should not mangle mbufs prior to AH/ESP) 356 */ 357 exthdrs.ip6e_dest2 = NULL; 358 359 { 360 struct ip6_rthdr *rh = NULL; 361 int segleft_org = 0; 362 struct ipsec_output_state state; 363 364 if (exthdrs.ip6e_rthdr) { 365 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 366 segleft_org = rh->ip6r_segleft; 367 rh->ip6r_segleft = 0; 368 } 369 370 bzero(&state, sizeof(state)); 371 state.m = m; 372 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 373 &needipsectun); 374 m = state.m; 375 if (error) { 376 /* mbuf is already reclaimed in ipsec6_output_trans. */ 377 m = NULL; 378 switch (error) { 379 case EHOSTUNREACH: 380 case ENETUNREACH: 381 case EMSGSIZE: 382 case ENOBUFS: 383 case ENOMEM: 384 break; 385 default: 386 printf("ip6_output (ipsec): error code %d\n", error); 387 /*fall through*/ 388 case ENOENT: 389 /* don't show these error codes to the user */ 390 error = 0; 391 break; 392 } 393 goto bad; 394 } 395 if (exthdrs.ip6e_rthdr) { 396 /* ah6_output doesn't modify mbuf chain */ 397 rh->ip6r_segleft = segleft_org; 398 } 399 } 400 skip_ipsec2:; 401 #endif 402 } 403 404 /* 405 * If there is a routing header, replace destination address field 406 * with the first hop of the routing header. 407 */ 408 if (exthdrs.ip6e_rthdr) { 409 struct ip6_rthdr *rh = 410 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 411 struct ip6_rthdr *)); 412 struct ip6_rthdr0 *rh0; 413 414 finaldst = ip6->ip6_dst; 415 switch(rh->ip6r_type) { 416 case IPV6_RTHDR_TYPE_0: 417 rh0 = (struct ip6_rthdr0 *)rh; 418 ip6->ip6_dst = rh0->ip6r0_addr[0]; 419 bcopy((caddr_t)&rh0->ip6r0_addr[1], 420 (caddr_t)&rh0->ip6r0_addr[0], 421 sizeof(struct in6_addr) * (rh0->ip6r0_segleft - 1) 422 ); 423 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 424 break; 425 default: /* is it possible? */ 426 error = EINVAL; 427 goto bad; 428 } 429 } 430 431 /* Source address validation */ 432 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 433 (flags & IPV6_DADOUTPUT) == 0) { 434 error = EOPNOTSUPP; 435 ip6stat.ip6s_badscope++; 436 goto bad; 437 } 438 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 439 error = EOPNOTSUPP; 440 ip6stat.ip6s_badscope++; 441 goto bad; 442 } 443 444 ip6stat.ip6s_localout++; 445 446 /* 447 * Route packet. 448 */ 449 if (ro == 0) { 450 ro = &ip6route; 451 bzero((caddr_t)ro, sizeof(*ro)); 452 } 453 ro_pmtu = ro; 454 if (opt && opt->ip6po_rthdr) 455 ro = &opt->ip6po_route; 456 dst = (struct sockaddr_in6 *)&ro->ro_dst; 457 /* 458 * If there is a cached route, 459 * check that it is to the same destination 460 * and is still up. If not, free it and try again. 461 */ 462 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 463 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 464 RTFREE(ro->ro_rt); 465 ro->ro_rt = (struct rtentry *)0; 466 } 467 if (ro->ro_rt == 0) { 468 bzero(dst, sizeof(*dst)); 469 dst->sin6_family = AF_INET6; 470 dst->sin6_len = sizeof(struct sockaddr_in6); 471 dst->sin6_addr = ip6->ip6_dst; 472 } 473 #ifdef IPSEC 474 if (needipsec && needipsectun) { 475 struct ipsec_output_state state; 476 477 /* 478 * All the extension headers will become inaccessible 479 * (since they can be encrypted). 480 * Don't panic, we need no more updates to extension headers 481 * on inner IPv6 packet (since they are now encapsulated). 482 * 483 * IPv6 [ESP|AH] IPv6 [extension headers] payload 484 */ 485 bzero(&exthdrs, sizeof(exthdrs)); 486 exthdrs.ip6e_ip6 = m; 487 488 bzero(&state, sizeof(state)); 489 state.m = m; 490 state.ro = (struct route *)ro; 491 state.dst = (struct sockaddr *)dst; 492 493 error = ipsec6_output_tunnel(&state, sp, flags); 494 495 m = state.m; 496 ro = (struct route_in6 *)state.ro; 497 dst = (struct sockaddr_in6 *)state.dst; 498 if (error) { 499 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 500 m0 = m = NULL; 501 m = NULL; 502 switch (error) { 503 case EHOSTUNREACH: 504 case ENETUNREACH: 505 case EMSGSIZE: 506 case ENOBUFS: 507 case ENOMEM: 508 break; 509 default: 510 printf("ip6_output (ipsec): error code %d\n", error); 511 /*fall through*/ 512 case ENOENT: 513 /* don't show these error codes to the user */ 514 error = 0; 515 break; 516 } 517 goto bad; 518 } 519 520 exthdrs.ip6e_ip6 = m; 521 } 522 #endif /*IPSEC*/ 523 524 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 525 /* Unicast */ 526 527 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 528 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 529 /* xxx 530 * interface selection comes here 531 * if an interface is specified from an upper layer, 532 * ifp must point it. 533 */ 534 if (ro->ro_rt == 0) { 535 /* 536 * non-bsdi always clone routes, if parent is 537 * PRF_CLONING. 538 */ 539 rtalloc((struct route *)ro); 540 } 541 if (ro->ro_rt == 0) { 542 ip6stat.ip6s_noroute++; 543 error = EHOSTUNREACH; 544 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 545 goto bad; 546 } 547 ia = ifatoia6(ro->ro_rt->rt_ifa); 548 ifp = ro->ro_rt->rt_ifp; 549 ro->ro_rt->rt_use++; 550 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 551 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 552 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 553 554 in6_ifstat_inc(ifp, ifs6_out_request); 555 556 /* 557 * Check if the outgoing interface conflicts with 558 * the interface specified by ifi6_ifindex (if specified). 559 * Note that loopback interface is always okay. 560 * (this may happen when we are sending a packet to one of 561 * our own addresses.) 562 */ 563 if (opt && opt->ip6po_pktinfo 564 && opt->ip6po_pktinfo->ipi6_ifindex) { 565 if (!(ifp->if_flags & IFF_LOOPBACK) 566 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 567 ip6stat.ip6s_noroute++; 568 in6_ifstat_inc(ifp, ifs6_out_discard); 569 error = EHOSTUNREACH; 570 goto bad; 571 } 572 } 573 574 if (opt && opt->ip6po_hlim != -1) 575 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 576 } else { 577 /* Multicast */ 578 struct in6_multi *in6m; 579 580 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 581 582 /* 583 * See if the caller provided any multicast options 584 */ 585 ifp = NULL; 586 if (im6o != NULL) { 587 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 588 if (im6o->im6o_multicast_ifp != NULL) 589 ifp = im6o->im6o_multicast_ifp; 590 } else 591 ip6->ip6_hlim = ip6_defmcasthlim; 592 593 /* 594 * See if the caller provided the outgoing interface 595 * as an ancillary data. 596 * Boundary check for ifindex is assumed to be already done. 597 */ 598 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 599 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 600 601 /* 602 * If the destination is a node-local scope multicast, 603 * the packet should be loop-backed only. 604 */ 605 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 606 /* 607 * If the outgoing interface is already specified, 608 * it should be a loopback interface. 609 */ 610 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 611 ip6stat.ip6s_badscope++; 612 error = ENETUNREACH; /* XXX: better error? */ 613 /* XXX correct ifp? */ 614 in6_ifstat_inc(ifp, ifs6_out_discard); 615 goto bad; 616 } else { 617 ifp = &loif[0]; 618 } 619 } 620 621 if (opt && opt->ip6po_hlim != -1) 622 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 623 624 /* 625 * If caller did not provide an interface lookup a 626 * default in the routing table. This is either a 627 * default for the speicfied group (i.e. a host 628 * route), or a multicast default (a route for the 629 * ``net'' ff00::/8). 630 */ 631 if (ifp == NULL) { 632 if (ro->ro_rt == 0) { 633 ro->ro_rt = rtalloc1((struct sockaddr *) 634 &ro->ro_dst, 0 635 ); 636 } 637 if (ro->ro_rt == 0) { 638 ip6stat.ip6s_noroute++; 639 error = EHOSTUNREACH; 640 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 641 goto bad; 642 } 643 ia = ifatoia6(ro->ro_rt->rt_ifa); 644 ifp = ro->ro_rt->rt_ifp; 645 ro->ro_rt->rt_use++; 646 } 647 648 if ((flags & IPV6_FORWARDING) == 0) 649 in6_ifstat_inc(ifp, ifs6_out_request); 650 in6_ifstat_inc(ifp, ifs6_out_mcast); 651 652 /* 653 * Confirm that the outgoing interface supports multicast. 654 */ 655 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 656 ip6stat.ip6s_noroute++; 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 error = ENETUNREACH; 659 goto bad; 660 } 661 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 662 if (in6m != NULL && 663 (im6o == NULL || im6o->im6o_multicast_loop)) { 664 /* 665 * If we belong to the destination multicast group 666 * on the outgoing interface, and the caller did not 667 * forbid loopback, loop back a copy. 668 */ 669 ip6_mloopback(ifp, m, dst); 670 } else { 671 /* 672 * If we are acting as a multicast router, perform 673 * multicast forwarding as if the packet had just 674 * arrived on the interface to which we are about 675 * to send. The multicast forwarding function 676 * recursively calls this function, using the 677 * IPV6_FORWARDING flag to prevent infinite recursion. 678 * 679 * Multicasts that are looped back by ip6_mloopback(), 680 * above, will be forwarded by the ip6_input() routine, 681 * if necessary. 682 */ 683 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 684 if (ip6_mforward(ip6, ifp, m) != 0) { 685 m_freem(m); 686 goto done; 687 } 688 } 689 } 690 /* 691 * Multicasts with a hoplimit of zero may be looped back, 692 * above, but must not be transmitted on a network. 693 * Also, multicasts addressed to the loopback interface 694 * are not sent -- the above call to ip6_mloopback() will 695 * loop back a copy if this host actually belongs to the 696 * destination group on the loopback interface. 697 */ 698 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 699 m_freem(m); 700 goto done; 701 } 702 } 703 704 /* 705 * Fill the outgoing inteface to tell the upper layer 706 * to increment per-interface statistics. 707 */ 708 if (ifpp) 709 *ifpp = ifp; 710 711 /* 712 * Determine path MTU. 713 */ 714 if (ro_pmtu != ro) { 715 /* The first hop and the final destination may differ. */ 716 struct sockaddr_in6 *sin6_fin = 717 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 718 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 719 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 720 &finaldst))) { 721 RTFREE(ro_pmtu->ro_rt); 722 ro_pmtu->ro_rt = (struct rtentry *)0; 723 } 724 if (ro_pmtu->ro_rt == 0) { 725 bzero(sin6_fin, sizeof(*sin6_fin)); 726 sin6_fin->sin6_family = AF_INET6; 727 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 728 sin6_fin->sin6_addr = finaldst; 729 730 rtalloc((struct route *)ro_pmtu); 731 } 732 } 733 if (ro_pmtu->ro_rt != NULL) { 734 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 735 736 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 737 if (mtu > ifmtu) { 738 /* 739 * The MTU on the route is larger than the MTU on 740 * the interface! This shouldn't happen, unless the 741 * MTU of the interface has been changed after the 742 * interface was brought up. Change the MTU in the 743 * route to match the interface MTU (as long as the 744 * field isn't locked). 745 */ 746 mtu = ifmtu; 747 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 748 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 749 } 750 } else { 751 mtu = nd_ifinfo[ifp->if_index].linkmtu; 752 } 753 754 /* Fake scoped addresses */ 755 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 756 /* 757 * If source or destination address is a scoped address, and 758 * the packet is going to be sent to a loopback interface, 759 * we should keep the original interface. 760 */ 761 762 /* 763 * XXX: this is a very experimental and temporary solution. 764 * We eventually have sockaddr_in6 and use the sin6_scope_id 765 * field of the structure here. 766 * We rely on the consistency between two scope zone ids 767 * of source add destination, which should already be assured 768 * Larger scopes than link will be supported in the near 769 * future. 770 */ 771 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 772 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 773 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 774 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 775 else 776 origifp = ifp; 777 } 778 else 779 origifp = ifp; 780 #ifndef FAKE_LOOPBACK_IF 781 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 782 #else 783 if (1) 784 #endif 785 { 786 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 787 ip6->ip6_src.s6_addr16[1] = 0; 788 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 789 ip6->ip6_dst.s6_addr16[1] = 0; 790 } 791 792 /* 793 * If the outgoing packet contains a hop-by-hop options header, 794 * it must be examined and processed even by the source node. 795 * (RFC 2460, section 4.) 796 */ 797 if (exthdrs.ip6e_hbh) { 798 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, 799 struct ip6_hbh *); 800 u_int32_t dummy1; /* XXX unused */ 801 u_int32_t dummy2; /* XXX unused */ 802 803 /* 804 * XXX: if we have to send an ICMPv6 error to the sender, 805 * we need the M_LOOP flag since icmp6_error() expects 806 * the IPv6 and the hop-by-hop options header are 807 * continuous unless the flag is set. 808 */ 809 m->m_flags |= M_LOOP; 810 m->m_pkthdr.rcvif = ifp; 811 if (ip6_process_hopopts(m, 812 (u_int8_t *)(hbh + 1), 813 ((hbh->ip6h_len + 1) << 3) - 814 sizeof(struct ip6_hbh), 815 &dummy1, &dummy2) < 0) { 816 /* m was already freed at this point */ 817 error = EINVAL;/* better error? */ 818 goto done; 819 } 820 m->m_flags &= ~M_LOOP; /* XXX */ 821 m->m_pkthdr.rcvif = NULL; 822 } 823 824 #ifdef PFIL_HOOKS 825 /* 826 * Run through list of hooks for output packets. 827 */ 828 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, 829 PFIL_OUT)) != 0) 830 goto done; 831 if (m == NULL) 832 goto done; 833 ip6 = mtod(m, struct ip6_hdr *); 834 #endif /* PFIL_HOOKS */ 835 /* 836 * Send the packet to the outgoing interface. 837 * If necessary, do IPv6 fragmentation before sending. 838 */ 839 tlen = m->m_pkthdr.len; 840 if (tlen <= mtu 841 #ifdef notyet 842 /* 843 * On any link that cannot convey a 1280-octet packet in one piece, 844 * link-specific fragmentation and reassembly must be provided at 845 * a layer below IPv6. [RFC 2460, sec.5] 846 * Thus if the interface has ability of link-level fragmentation, 847 * we can just send the packet even if the packet size is 848 * larger than the link's MTU. 849 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 850 */ 851 852 || ifp->if_flags & IFF_FRAGMENTABLE 853 #endif 854 ) 855 { 856 #ifdef IFA_STATS 857 struct in6_ifaddr *ia6; 858 ip6 = mtod(m, struct ip6_hdr *); 859 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 860 if (ia6) { 861 ia6->ia_ifa.ifa_data.ifad_outbytes += 862 m->m_pkthdr.len; 863 } 864 #endif 865 #ifdef IPSEC 866 /* clean ipsec history once it goes out of the node */ 867 ipsec_delaux(m); 868 #endif 869 #ifdef OLDIP6OUTPUT 870 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 871 ro->ro_rt); 872 #else 873 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 874 #endif 875 goto done; 876 } else if (mtu < IPV6_MMTU) { 877 /* 878 * note that path MTU is never less than IPV6_MMTU 879 * (see icmp6_input). 880 */ 881 error = EMSGSIZE; 882 in6_ifstat_inc(ifp, ifs6_out_fragfail); 883 goto bad; 884 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 885 error = EMSGSIZE; 886 in6_ifstat_inc(ifp, ifs6_out_fragfail); 887 goto bad; 888 } else { 889 struct mbuf **mnext, *m_frgpart; 890 struct ip6_frag *ip6f; 891 u_int32_t id = htonl(ip6_id++); 892 u_char nextproto; 893 894 /* 895 * Too large for the destination or interface; 896 * fragment if possible. 897 * Must be able to put at least 8 bytes per fragment. 898 */ 899 hlen = unfragpartlen; 900 if (mtu > IPV6_MAXPACKET) 901 mtu = IPV6_MAXPACKET; 902 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 903 if (len < 8) { 904 error = EMSGSIZE; 905 in6_ifstat_inc(ifp, ifs6_out_fragfail); 906 goto bad; 907 } 908 909 mnext = &m->m_nextpkt; 910 911 /* 912 * Change the next header field of the last header in the 913 * unfragmentable part. 914 */ 915 if (exthdrs.ip6e_rthdr) { 916 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 917 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 918 } else if (exthdrs.ip6e_dest1) { 919 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 920 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 921 } else if (exthdrs.ip6e_hbh) { 922 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 923 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 924 } else { 925 nextproto = ip6->ip6_nxt; 926 ip6->ip6_nxt = IPPROTO_FRAGMENT; 927 } 928 929 /* 930 * Loop through length of segment after first fragment, 931 * make new header and copy data of each part and link onto chain. 932 */ 933 m0 = m; 934 for (off = hlen; off < tlen; off += len) { 935 MGETHDR(m, M_DONTWAIT, MT_HEADER); 936 if (!m) { 937 error = ENOBUFS; 938 ip6stat.ip6s_odropped++; 939 goto sendorfree; 940 } 941 m->m_flags = m0->m_flags & M_COPYFLAGS; 942 *mnext = m; 943 mnext = &m->m_nextpkt; 944 m->m_data += max_linkhdr; 945 mhip6 = mtod(m, struct ip6_hdr *); 946 *mhip6 = *ip6; 947 m->m_len = sizeof(*mhip6); 948 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 949 if (error) { 950 ip6stat.ip6s_odropped++; 951 goto sendorfree; 952 } 953 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 954 if (off + len >= tlen) 955 len = tlen - off; 956 else 957 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 958 mhip6->ip6_plen = htons((u_short)(len + hlen + 959 sizeof(*ip6f) - 960 sizeof(struct ip6_hdr))); 961 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 962 error = ENOBUFS; 963 ip6stat.ip6s_odropped++; 964 goto sendorfree; 965 } 966 m_cat(m, m_frgpart); 967 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 968 m->m_pkthdr.rcvif = (struct ifnet *)0; 969 ip6f->ip6f_reserved = 0; 970 ip6f->ip6f_ident = id; 971 ip6f->ip6f_nxt = nextproto; 972 ip6stat.ip6s_ofragments++; 973 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 974 } 975 976 in6_ifstat_inc(ifp, ifs6_out_fragok); 977 } 978 979 /* 980 * Remove leading garbages. 981 */ 982 sendorfree: 983 m = m0->m_nextpkt; 984 m0->m_nextpkt = 0; 985 m_freem(m0); 986 for (m0 = m; m; m = m0) { 987 m0 = m->m_nextpkt; 988 m->m_nextpkt = 0; 989 if (error == 0) { 990 #ifdef IFA_STATS 991 struct in6_ifaddr *ia6; 992 ip6 = mtod(m, struct ip6_hdr *); 993 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 994 if (ia6) { 995 ia6->ia_ifa.ifa_data.ifad_outbytes += 996 m->m_pkthdr.len; 997 } 998 #endif 999 #ifdef IPSEC 1000 /* clean ipsec history once it goes out of the node */ 1001 ipsec_delaux(m); 1002 #endif 1003 #ifdef OLDIP6OUTPUT 1004 error = (*ifp->if_output)(ifp, m, 1005 (struct sockaddr *)dst, 1006 ro->ro_rt); 1007 #else 1008 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1009 #endif 1010 } else 1011 m_freem(m); 1012 } 1013 1014 if (error == 0) 1015 ip6stat.ip6s_fragmented++; 1016 1017 done: 1018 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1019 RTFREE(ro->ro_rt); 1020 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1021 RTFREE(ro_pmtu->ro_rt); 1022 } 1023 1024 #ifdef IPSEC 1025 if (sp != NULL) 1026 key_freesp(sp); 1027 #endif /* IPSEC */ 1028 1029 return(error); 1030 1031 freehdrs: 1032 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1033 m_freem(exthdrs.ip6e_dest1); 1034 m_freem(exthdrs.ip6e_rthdr); 1035 m_freem(exthdrs.ip6e_dest2); 1036 /* fall through */ 1037 bad: 1038 m_freem(m); 1039 goto done; 1040 } 1041 1042 static int 1043 ip6_copyexthdr(mp, hdr, hlen) 1044 struct mbuf **mp; 1045 caddr_t hdr; 1046 int hlen; 1047 { 1048 struct mbuf *m; 1049 1050 if (hlen > MCLBYTES) 1051 return(ENOBUFS); /* XXX */ 1052 1053 MGET(m, M_DONTWAIT, MT_DATA); 1054 if (!m) 1055 return(ENOBUFS); 1056 1057 if (hlen > MLEN) { 1058 MCLGET(m, M_DONTWAIT); 1059 if ((m->m_flags & M_EXT) == 0) { 1060 m_free(m); 1061 return(ENOBUFS); 1062 } 1063 } 1064 m->m_len = hlen; 1065 if (hdr) 1066 bcopy(hdr, mtod(m, caddr_t), hlen); 1067 1068 *mp = m; 1069 return(0); 1070 } 1071 1072 /* 1073 * Insert jumbo payload option. 1074 */ 1075 static int 1076 ip6_insert_jumboopt(exthdrs, plen) 1077 struct ip6_exthdrs *exthdrs; 1078 u_int32_t plen; 1079 { 1080 struct mbuf *mopt; 1081 u_char *optbuf; 1082 u_int32_t v; 1083 1084 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1085 1086 /* 1087 * If there is no hop-by-hop options header, allocate new one. 1088 * If there is one but it doesn't have enough space to store the 1089 * jumbo payload option, allocate a cluster to store the whole options. 1090 * Otherwise, use it to store the options. 1091 */ 1092 if (exthdrs->ip6e_hbh == 0) { 1093 MGET(mopt, M_DONTWAIT, MT_DATA); 1094 if (mopt == 0) 1095 return(ENOBUFS); 1096 mopt->m_len = JUMBOOPTLEN; 1097 optbuf = mtod(mopt, u_char *); 1098 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1099 exthdrs->ip6e_hbh = mopt; 1100 } else { 1101 struct ip6_hbh *hbh; 1102 1103 mopt = exthdrs->ip6e_hbh; 1104 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1105 /* 1106 * XXX assumption: 1107 * - exthdrs->ip6e_hbh is not referenced from places 1108 * other than exthdrs. 1109 * - exthdrs->ip6e_hbh is not an mbuf chain. 1110 */ 1111 int oldoptlen = mopt->m_len; 1112 struct mbuf *n; 1113 1114 /* 1115 * XXX: give up if the whole (new) hbh header does 1116 * not fit even in an mbuf cluster. 1117 */ 1118 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1119 return(ENOBUFS); 1120 1121 /* 1122 * As a consequence, we must always prepare a cluster 1123 * at this point. 1124 */ 1125 MGET(n, M_DONTWAIT, MT_DATA); 1126 if (n) { 1127 MCLGET(n, M_DONTWAIT); 1128 if ((n->m_flags & M_EXT) == 0) { 1129 m_freem(n); 1130 n = NULL; 1131 } 1132 } 1133 if (!n) 1134 return(ENOBUFS); 1135 n->m_len = oldoptlen + JUMBOOPTLEN; 1136 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1137 oldoptlen); 1138 optbuf = mtod(n, caddr_t) + oldoptlen; 1139 m_freem(mopt); 1140 exthdrs->ip6e_hbh = n; 1141 } else { 1142 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1143 mopt->m_len += JUMBOOPTLEN; 1144 } 1145 optbuf[0] = IP6OPT_PADN; 1146 optbuf[1] = 1; 1147 1148 /* 1149 * Adjust the header length according to the pad and 1150 * the jumbo payload option. 1151 */ 1152 hbh = mtod(mopt, struct ip6_hbh *); 1153 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1154 } 1155 1156 /* fill in the option. */ 1157 optbuf[2] = IP6OPT_JUMBO; 1158 optbuf[3] = 4; 1159 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1160 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1161 1162 /* finally, adjust the packet header length */ 1163 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1164 1165 return(0); 1166 #undef JUMBOOPTLEN 1167 } 1168 1169 /* 1170 * Insert fragment header and copy unfragmentable header portions. 1171 */ 1172 static int 1173 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1174 struct mbuf *m0, *m; 1175 int hlen; 1176 struct ip6_frag **frghdrp; 1177 { 1178 struct mbuf *n, *mlast; 1179 1180 if (hlen > sizeof(struct ip6_hdr)) { 1181 n = m_copym(m0, sizeof(struct ip6_hdr), 1182 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1183 if (n == 0) 1184 return(ENOBUFS); 1185 m->m_next = n; 1186 } else 1187 n = m; 1188 1189 /* Search for the last mbuf of unfragmentable part. */ 1190 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1191 ; 1192 1193 if ((mlast->m_flags & M_EXT) == 0 && 1194 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1195 /* use the trailing space of the last mbuf for the fragment hdr */ 1196 *frghdrp = 1197 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1198 mlast->m_len += sizeof(struct ip6_frag); 1199 m->m_pkthdr.len += sizeof(struct ip6_frag); 1200 } else { 1201 /* allocate a new mbuf for the fragment header */ 1202 struct mbuf *mfrg; 1203 1204 MGET(mfrg, M_DONTWAIT, MT_DATA); 1205 if (mfrg == 0) 1206 return(ENOBUFS); 1207 mfrg->m_len = sizeof(struct ip6_frag); 1208 *frghdrp = mtod(mfrg, struct ip6_frag *); 1209 mlast->m_next = mfrg; 1210 } 1211 1212 return(0); 1213 } 1214 1215 /* 1216 * IP6 socket option processing. 1217 */ 1218 int 1219 ip6_ctloutput(op, so, level, optname, mp) 1220 int op; 1221 struct socket *so; 1222 int level, optname; 1223 struct mbuf **mp; 1224 { 1225 register struct in6pcb *in6p = sotoin6pcb(so); 1226 register struct mbuf *m = *mp; 1227 register int optval = 0; 1228 int error = 0; 1229 struct proc *p = curproc; /* XXX */ 1230 1231 if (level == IPPROTO_IPV6) { 1232 switch (op) { 1233 1234 case PRCO_SETOPT: 1235 switch (optname) { 1236 case IPV6_PKTOPTIONS: 1237 /* m is freed in ip6_pcbopts */ 1238 return(ip6_pcbopts(&in6p->in6p_outputopts, 1239 m, so)); 1240 case IPV6_HOPOPTS: 1241 case IPV6_DSTOPTS: 1242 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1243 error = EPERM; 1244 break; 1245 } 1246 /* fall through */ 1247 case IPV6_UNICAST_HOPS: 1248 case IPV6_RECVOPTS: 1249 case IPV6_RECVRETOPTS: 1250 case IPV6_RECVDSTADDR: 1251 case IPV6_PKTINFO: 1252 case IPV6_HOPLIMIT: 1253 case IPV6_RTHDR: 1254 case IPV6_CHECKSUM: 1255 case IPV6_FAITH: 1256 #ifndef INET6_BINDV6ONLY 1257 case IPV6_BINDV6ONLY: 1258 #endif 1259 if (!m || m->m_len != sizeof(int)) 1260 error = EINVAL; 1261 else { 1262 optval = *mtod(m, int *); 1263 switch (optname) { 1264 1265 case IPV6_UNICAST_HOPS: 1266 if (optval < -1 || optval >= 256) 1267 error = EINVAL; 1268 else { 1269 /* -1 = kernel default */ 1270 in6p->in6p_hops = optval; 1271 } 1272 break; 1273 #define OPTSET(bit) \ 1274 if (optval) \ 1275 in6p->in6p_flags |= bit; \ 1276 else \ 1277 in6p->in6p_flags &= ~bit; 1278 1279 case IPV6_RECVOPTS: 1280 OPTSET(IN6P_RECVOPTS); 1281 break; 1282 1283 case IPV6_RECVRETOPTS: 1284 OPTSET(IN6P_RECVRETOPTS); 1285 break; 1286 1287 case IPV6_RECVDSTADDR: 1288 OPTSET(IN6P_RECVDSTADDR); 1289 break; 1290 1291 case IPV6_PKTINFO: 1292 OPTSET(IN6P_PKTINFO); 1293 break; 1294 1295 case IPV6_HOPLIMIT: 1296 OPTSET(IN6P_HOPLIMIT); 1297 break; 1298 1299 case IPV6_HOPOPTS: 1300 OPTSET(IN6P_HOPOPTS); 1301 break; 1302 1303 case IPV6_DSTOPTS: 1304 OPTSET(IN6P_DSTOPTS); 1305 break; 1306 1307 case IPV6_RTHDR: 1308 OPTSET(IN6P_RTHDR); 1309 break; 1310 1311 case IPV6_CHECKSUM: 1312 in6p->in6p_cksum = optval; 1313 break; 1314 1315 case IPV6_FAITH: 1316 OPTSET(IN6P_FAITH); 1317 break; 1318 1319 #ifndef INET6_BINDV6ONLY 1320 case IPV6_BINDV6ONLY: 1321 OPTSET(IN6P_BINDV6ONLY); 1322 break; 1323 #endif 1324 } 1325 } 1326 break; 1327 #undef OPTSET 1328 1329 case IPV6_MULTICAST_IF: 1330 case IPV6_MULTICAST_HOPS: 1331 case IPV6_MULTICAST_LOOP: 1332 case IPV6_JOIN_GROUP: 1333 case IPV6_LEAVE_GROUP: 1334 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1335 break; 1336 1337 case IPV6_PORTRANGE: 1338 optval = *mtod(m, int *); 1339 1340 switch (optval) { 1341 case IPV6_PORTRANGE_DEFAULT: 1342 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1343 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1344 break; 1345 1346 case IPV6_PORTRANGE_HIGH: 1347 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1348 in6p->in6p_flags |= IN6P_HIGHPORT; 1349 break; 1350 1351 case IPV6_PORTRANGE_LOW: 1352 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1353 in6p->in6p_flags |= IN6P_LOWPORT; 1354 break; 1355 1356 default: 1357 error = EINVAL; 1358 break; 1359 } 1360 break; 1361 1362 #ifdef IPSEC 1363 case IPV6_IPSEC_POLICY: 1364 { 1365 caddr_t req = NULL; 1366 size_t len = 0; 1367 1368 int priv = 0; 1369 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1370 priv = 0; 1371 else 1372 priv = 1; 1373 if (m) { 1374 req = mtod(m, caddr_t); 1375 len = m->m_len; 1376 } 1377 error = ipsec6_set_policy(in6p, 1378 optname, req, len, priv); 1379 } 1380 break; 1381 #endif /* IPSEC */ 1382 1383 default: 1384 error = ENOPROTOOPT; 1385 break; 1386 } 1387 if (m) 1388 (void)m_free(m); 1389 break; 1390 1391 case PRCO_GETOPT: 1392 switch (optname) { 1393 1394 case IPV6_OPTIONS: 1395 case IPV6_RETOPTS: 1396 #if 0 1397 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1398 if (in6p->in6p_options) { 1399 m->m_len = in6p->in6p_options->m_len; 1400 bcopy(mtod(in6p->in6p_options, caddr_t), 1401 mtod(m, caddr_t), 1402 (unsigned)m->m_len); 1403 } else 1404 m->m_len = 0; 1405 break; 1406 #else 1407 error = ENOPROTOOPT; 1408 break; 1409 #endif 1410 1411 case IPV6_PKTOPTIONS: 1412 if (in6p->in6p_options) { 1413 *mp = m_copym(in6p->in6p_options, 0, 1414 M_COPYALL, M_WAIT); 1415 } else { 1416 *mp = m_get(M_WAIT, MT_SOOPTS); 1417 (*mp)->m_len = 0; 1418 } 1419 break; 1420 1421 case IPV6_HOPOPTS: 1422 case IPV6_DSTOPTS: 1423 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1424 error = EPERM; 1425 break; 1426 } 1427 /* fall through */ 1428 case IPV6_UNICAST_HOPS: 1429 case IPV6_RECVOPTS: 1430 case IPV6_RECVRETOPTS: 1431 case IPV6_RECVDSTADDR: 1432 case IPV6_PORTRANGE: 1433 case IPV6_PKTINFO: 1434 case IPV6_HOPLIMIT: 1435 case IPV6_RTHDR: 1436 case IPV6_CHECKSUM: 1437 case IPV6_FAITH: 1438 #ifndef INET6_BINDV6ONLY 1439 case IPV6_BINDV6ONLY: 1440 #endif 1441 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1442 m->m_len = sizeof(int); 1443 switch (optname) { 1444 1445 case IPV6_UNICAST_HOPS: 1446 optval = in6p->in6p_hops; 1447 break; 1448 1449 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1450 1451 case IPV6_RECVOPTS: 1452 optval = OPTBIT(IN6P_RECVOPTS); 1453 break; 1454 1455 case IPV6_RECVRETOPTS: 1456 optval = OPTBIT(IN6P_RECVRETOPTS); 1457 break; 1458 1459 case IPV6_RECVDSTADDR: 1460 optval = OPTBIT(IN6P_RECVDSTADDR); 1461 break; 1462 1463 case IPV6_PORTRANGE: 1464 { 1465 int flags; 1466 flags = in6p->in6p_flags; 1467 if (flags & IN6P_HIGHPORT) 1468 optval = IPV6_PORTRANGE_HIGH; 1469 else if (flags & IN6P_LOWPORT) 1470 optval = IPV6_PORTRANGE_LOW; 1471 else 1472 optval = 0; 1473 break; 1474 } 1475 1476 case IPV6_PKTINFO: 1477 optval = OPTBIT(IN6P_PKTINFO); 1478 break; 1479 1480 case IPV6_HOPLIMIT: 1481 optval = OPTBIT(IN6P_HOPLIMIT); 1482 break; 1483 1484 case IPV6_HOPOPTS: 1485 optval = OPTBIT(IN6P_HOPOPTS); 1486 break; 1487 1488 case IPV6_DSTOPTS: 1489 optval = OPTBIT(IN6P_DSTOPTS); 1490 break; 1491 1492 case IPV6_RTHDR: 1493 optval = OPTBIT(IN6P_RTHDR); 1494 break; 1495 1496 case IPV6_CHECKSUM: 1497 optval = in6p->in6p_cksum; 1498 break; 1499 1500 case IPV6_FAITH: 1501 optval = OPTBIT(IN6P_FAITH); 1502 break; 1503 1504 #ifndef INET6_BINDV6ONLY 1505 case IPV6_BINDV6ONLY: 1506 optval = OPTBIT(IN6P_BINDV6ONLY); 1507 break; 1508 #endif 1509 } 1510 *mtod(m, int *) = optval; 1511 break; 1512 1513 case IPV6_MULTICAST_IF: 1514 case IPV6_MULTICAST_HOPS: 1515 case IPV6_MULTICAST_LOOP: 1516 case IPV6_JOIN_GROUP: 1517 case IPV6_LEAVE_GROUP: 1518 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1519 break; 1520 1521 #ifdef IPSEC 1522 case IPV6_IPSEC_POLICY: 1523 { 1524 caddr_t req = NULL; 1525 size_t len = 0; 1526 1527 if (m) { 1528 req = mtod(m, caddr_t); 1529 len = m->m_len; 1530 } 1531 error = ipsec6_get_policy(in6p, req, len, mp); 1532 break; 1533 } 1534 #endif /* IPSEC */ 1535 1536 default: 1537 error = ENOPROTOOPT; 1538 break; 1539 } 1540 break; 1541 } 1542 } else { 1543 error = EINVAL; 1544 if (op == PRCO_SETOPT && *mp) 1545 (void)m_free(*mp); 1546 } 1547 return(error); 1548 } 1549 1550 /* 1551 * Set up IP6 options in pcb for insertion in output packets. 1552 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1553 * with destination address if source routed. 1554 */ 1555 static int 1556 ip6_pcbopts(pktopt, m, so) 1557 struct ip6_pktopts **pktopt; 1558 register struct mbuf *m; 1559 struct socket *so; 1560 { 1561 register struct ip6_pktopts *opt = *pktopt; 1562 int error = 0; 1563 struct proc *p = curproc; /* XXX */ 1564 int priv = 0; 1565 1566 /* turn off any old options. */ 1567 if (opt) { 1568 if (opt->ip6po_m) 1569 (void)m_free(opt->ip6po_m); 1570 } else 1571 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1572 *pktopt = 0; 1573 1574 if (!m || m->m_len == 0) { 1575 /* 1576 * Only turning off any previous options. 1577 */ 1578 if (opt) 1579 free(opt, M_IP6OPT); 1580 if (m) 1581 (void)m_free(m); 1582 return(0); 1583 } 1584 1585 /* set options specified by user. */ 1586 if (p && !suser(p->p_ucred, &p->p_acflag)) 1587 priv = 1; 1588 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1589 (void)m_free(m); 1590 return(error); 1591 } 1592 *pktopt = opt; 1593 return(0); 1594 } 1595 1596 /* 1597 * Set the IP6 multicast options in response to user setsockopt(). 1598 */ 1599 static int 1600 ip6_setmoptions(optname, im6op, m) 1601 int optname; 1602 struct ip6_moptions **im6op; 1603 struct mbuf *m; 1604 { 1605 int error = 0; 1606 u_int loop, ifindex; 1607 struct ipv6_mreq *mreq; 1608 struct ifnet *ifp; 1609 struct ip6_moptions *im6o = *im6op; 1610 struct route_in6 ro; 1611 struct sockaddr_in6 *dst; 1612 struct in6_multi_mship *imm; 1613 struct proc *p = curproc; /* XXX */ 1614 1615 if (im6o == NULL) { 1616 /* 1617 * No multicast option buffer attached to the pcb; 1618 * allocate one and initialize to default values. 1619 */ 1620 im6o = (struct ip6_moptions *) 1621 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1622 1623 if (im6o == NULL) 1624 return(ENOBUFS); 1625 *im6op = im6o; 1626 im6o->im6o_multicast_ifp = NULL; 1627 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1628 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1629 LIST_INIT(&im6o->im6o_memberships); 1630 } 1631 1632 switch (optname) { 1633 1634 case IPV6_MULTICAST_IF: 1635 /* 1636 * Select the interface for outgoing multicast packets. 1637 */ 1638 if (m == NULL || m->m_len != sizeof(u_int)) { 1639 error = EINVAL; 1640 break; 1641 } 1642 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1643 if (ifindex < 0 || if_index < ifindex) { 1644 error = ENXIO; /* XXX EINVAL? */ 1645 break; 1646 } 1647 ifp = ifindex2ifnet[ifindex]; 1648 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1649 error = EADDRNOTAVAIL; 1650 break; 1651 } 1652 im6o->im6o_multicast_ifp = ifp; 1653 break; 1654 1655 case IPV6_MULTICAST_HOPS: 1656 { 1657 /* 1658 * Set the IP6 hoplimit for outgoing multicast packets. 1659 */ 1660 int optval; 1661 if (m == NULL || m->m_len != sizeof(int)) { 1662 error = EINVAL; 1663 break; 1664 } 1665 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1666 if (optval < -1 || optval >= 256) 1667 error = EINVAL; 1668 else if (optval == -1) 1669 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1670 else 1671 im6o->im6o_multicast_hlim = optval; 1672 break; 1673 } 1674 1675 case IPV6_MULTICAST_LOOP: 1676 /* 1677 * Set the loopback flag for outgoing multicast packets. 1678 * Must be zero or one. 1679 */ 1680 if (m == NULL || m->m_len != sizeof(u_int)) { 1681 error = EINVAL; 1682 break; 1683 } 1684 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1685 if (loop > 1) { 1686 error = EINVAL; 1687 break; 1688 } 1689 im6o->im6o_multicast_loop = loop; 1690 break; 1691 1692 case IPV6_JOIN_GROUP: 1693 /* 1694 * Add a multicast group membership. 1695 * Group must be a valid IP6 multicast address. 1696 */ 1697 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1698 error = EINVAL; 1699 break; 1700 } 1701 mreq = mtod(m, struct ipv6_mreq *); 1702 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1703 /* 1704 * We use the unspecified address to specify to accept 1705 * all multicast addresses. Only super user is allowed 1706 * to do this. 1707 */ 1708 if (suser(p->p_ucred, &p->p_acflag)) { 1709 error = EACCES; 1710 break; 1711 } 1712 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1713 error = EINVAL; 1714 break; 1715 } 1716 1717 /* 1718 * If the interface is specified, validate it. 1719 */ 1720 if (mreq->ipv6mr_interface < 0 1721 || if_index < mreq->ipv6mr_interface) { 1722 error = ENXIO; /* XXX EINVAL? */ 1723 break; 1724 } 1725 /* 1726 * If no interface was explicitly specified, choose an 1727 * appropriate one according to the given multicast address. 1728 */ 1729 if (mreq->ipv6mr_interface == 0) { 1730 /* 1731 * If the multicast address is in node-local scope, 1732 * the interface should be a loopback interface. 1733 * Otherwise, look up the routing table for the 1734 * address, and choose the outgoing interface. 1735 * XXX: is it a good approach? 1736 */ 1737 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1738 ifp = &loif[0]; 1739 } else { 1740 ro.ro_rt = NULL; 1741 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1742 bzero(dst, sizeof(*dst)); 1743 dst->sin6_len = sizeof(struct sockaddr_in6); 1744 dst->sin6_family = AF_INET6; 1745 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1746 rtalloc((struct route *)&ro); 1747 if (ro.ro_rt == NULL) { 1748 error = EADDRNOTAVAIL; 1749 break; 1750 } 1751 ifp = ro.ro_rt->rt_ifp; 1752 rtfree(ro.ro_rt); 1753 } 1754 } else 1755 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1756 1757 /* 1758 * See if we found an interface, and confirm that it 1759 * supports multicast 1760 */ 1761 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1762 error = EADDRNOTAVAIL; 1763 break; 1764 } 1765 /* 1766 * Put interface index into the multicast address, 1767 * if the address has link-local scope. 1768 */ 1769 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1770 mreq->ipv6mr_multiaddr.s6_addr16[1] 1771 = htons(mreq->ipv6mr_interface); 1772 } 1773 /* 1774 * See if the membership already exists. 1775 */ 1776 for (imm = im6o->im6o_memberships.lh_first; 1777 imm != NULL; imm = imm->i6mm_chain.le_next) 1778 if (imm->i6mm_maddr->in6m_ifp == ifp && 1779 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1780 &mreq->ipv6mr_multiaddr)) 1781 break; 1782 if (imm != NULL) { 1783 error = EADDRINUSE; 1784 break; 1785 } 1786 /* 1787 * Everything looks good; add a new record to the multicast 1788 * address list for the given interface. 1789 */ 1790 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1791 if (imm == NULL) { 1792 error = ENOBUFS; 1793 break; 1794 } 1795 if ((imm->i6mm_maddr = 1796 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1797 free(imm, M_IPMADDR); 1798 break; 1799 } 1800 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1801 break; 1802 1803 case IPV6_LEAVE_GROUP: 1804 /* 1805 * Drop a multicast group membership. 1806 * Group must be a valid IP6 multicast address. 1807 */ 1808 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1809 error = EINVAL; 1810 break; 1811 } 1812 mreq = mtod(m, struct ipv6_mreq *); 1813 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1814 if (suser(p->p_ucred, &p->p_acflag)) { 1815 error = EACCES; 1816 break; 1817 } 1818 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1819 error = EINVAL; 1820 break; 1821 } 1822 /* 1823 * If an interface address was specified, get a pointer 1824 * to its ifnet structure. 1825 */ 1826 if (mreq->ipv6mr_interface < 0 1827 || if_index < mreq->ipv6mr_interface) { 1828 error = ENXIO; /* XXX EINVAL? */ 1829 break; 1830 } 1831 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1832 /* 1833 * Put interface index into the multicast address, 1834 * if the address has link-local scope. 1835 */ 1836 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1837 mreq->ipv6mr_multiaddr.s6_addr16[1] 1838 = htons(mreq->ipv6mr_interface); 1839 } 1840 /* 1841 * Find the membership in the membership list. 1842 */ 1843 for (imm = im6o->im6o_memberships.lh_first; 1844 imm != NULL; imm = imm->i6mm_chain.le_next) { 1845 if ((ifp == NULL || 1846 imm->i6mm_maddr->in6m_ifp == ifp) && 1847 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1848 &mreq->ipv6mr_multiaddr)) 1849 break; 1850 } 1851 if (imm == NULL) { 1852 /* Unable to resolve interface */ 1853 error = EADDRNOTAVAIL; 1854 break; 1855 } 1856 /* 1857 * Give up the multicast address record to which the 1858 * membership points. 1859 */ 1860 LIST_REMOVE(imm, i6mm_chain); 1861 in6_delmulti(imm->i6mm_maddr); 1862 free(imm, M_IPMADDR); 1863 break; 1864 1865 default: 1866 error = EOPNOTSUPP; 1867 break; 1868 } 1869 1870 /* 1871 * If all options have default values, no need to keep the mbuf. 1872 */ 1873 if (im6o->im6o_multicast_ifp == NULL && 1874 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1875 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1876 im6o->im6o_memberships.lh_first == NULL) { 1877 free(*im6op, M_IPMOPTS); 1878 *im6op = NULL; 1879 } 1880 1881 return(error); 1882 } 1883 1884 /* 1885 * Return the IP6 multicast options in response to user getsockopt(). 1886 */ 1887 static int 1888 ip6_getmoptions(optname, im6o, mp) 1889 int optname; 1890 register struct ip6_moptions *im6o; 1891 register struct mbuf **mp; 1892 { 1893 u_int *hlim, *loop, *ifindex; 1894 1895 *mp = m_get(M_WAIT, MT_SOOPTS); 1896 1897 switch (optname) { 1898 1899 case IPV6_MULTICAST_IF: 1900 ifindex = mtod(*mp, u_int *); 1901 (*mp)->m_len = sizeof(u_int); 1902 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1903 *ifindex = 0; 1904 else 1905 *ifindex = im6o->im6o_multicast_ifp->if_index; 1906 return(0); 1907 1908 case IPV6_MULTICAST_HOPS: 1909 hlim = mtod(*mp, u_int *); 1910 (*mp)->m_len = sizeof(u_int); 1911 if (im6o == NULL) 1912 *hlim = ip6_defmcasthlim; 1913 else 1914 *hlim = im6o->im6o_multicast_hlim; 1915 return(0); 1916 1917 case IPV6_MULTICAST_LOOP: 1918 loop = mtod(*mp, u_int *); 1919 (*mp)->m_len = sizeof(u_int); 1920 if (im6o == NULL) 1921 *loop = ip6_defmcasthlim; 1922 else 1923 *loop = im6o->im6o_multicast_loop; 1924 return(0); 1925 1926 default: 1927 return(EOPNOTSUPP); 1928 } 1929 } 1930 1931 /* 1932 * Discard the IP6 multicast options. 1933 */ 1934 void 1935 ip6_freemoptions(im6o) 1936 register struct ip6_moptions *im6o; 1937 { 1938 struct in6_multi_mship *imm; 1939 1940 if (im6o == NULL) 1941 return; 1942 1943 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1944 LIST_REMOVE(imm, i6mm_chain); 1945 if (imm->i6mm_maddr) 1946 in6_delmulti(imm->i6mm_maddr); 1947 free(imm, M_IPMADDR); 1948 } 1949 free(im6o, M_IPMOPTS); 1950 } 1951 1952 /* 1953 * Set IPv6 outgoing packet options based on advanced API. 1954 */ 1955 int 1956 ip6_setpktoptions(control, opt, priv) 1957 struct mbuf *control; 1958 struct ip6_pktopts *opt; 1959 int priv; 1960 { 1961 register struct cmsghdr *cm = 0; 1962 1963 if (control == 0 || opt == 0) 1964 return(EINVAL); 1965 1966 bzero(opt, sizeof(*opt)); 1967 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1968 1969 /* 1970 * XXX: Currently, we assume all the optional information is stored 1971 * in a single mbuf. 1972 */ 1973 if (control->m_next) 1974 return(EINVAL); 1975 1976 opt->ip6po_m = control; 1977 1978 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1979 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1980 cm = mtod(control, struct cmsghdr *); 1981 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1982 return(EINVAL); 1983 if (cm->cmsg_level != IPPROTO_IPV6) 1984 continue; 1985 1986 switch(cm->cmsg_type) { 1987 case IPV6_PKTINFO: 1988 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1989 return(EINVAL); 1990 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1991 if (opt->ip6po_pktinfo->ipi6_ifindex && 1992 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1993 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1994 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1995 1996 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1997 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1998 return(ENXIO); 1999 } 2000 2001 /* 2002 * Check if the requested source address is indeed a 2003 * unicast address assigned to the node. 2004 */ 2005 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2006 struct ifaddr *ia; 2007 struct sockaddr_in6 sin6; 2008 2009 bzero(&sin6, sizeof(sin6)); 2010 sin6.sin6_len = sizeof(sin6); 2011 sin6.sin6_family = AF_INET6; 2012 sin6.sin6_addr = 2013 opt->ip6po_pktinfo->ipi6_addr; 2014 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2015 if (ia == NULL || 2016 (opt->ip6po_pktinfo->ipi6_ifindex && 2017 (ia->ifa_ifp->if_index != 2018 opt->ip6po_pktinfo->ipi6_ifindex))) { 2019 return(EADDRNOTAVAIL); 2020 } 2021 /* 2022 * Check if the requested source address is 2023 * indeed a unicast address assigned to the 2024 * node. 2025 */ 2026 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2027 return(EADDRNOTAVAIL); 2028 } 2029 break; 2030 2031 case IPV6_HOPLIMIT: 2032 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2033 return(EINVAL); 2034 2035 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2036 sizeof(opt->ip6po_hlim)); 2037 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2038 return(EINVAL); 2039 break; 2040 2041 case IPV6_NEXTHOP: 2042 if (!priv) 2043 return(EPERM); 2044 2045 if (cm->cmsg_len < sizeof(u_char) || 2046 /* check if cmsg_len is large enough for sa_len */ 2047 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2048 return(EINVAL); 2049 2050 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2051 2052 break; 2053 2054 case IPV6_HOPOPTS: 2055 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2056 return(EINVAL); 2057 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2058 if (cm->cmsg_len != 2059 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2060 return(EINVAL); 2061 break; 2062 2063 case IPV6_DSTOPTS: 2064 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2065 return(EINVAL); 2066 2067 /* 2068 * If there is no routing header yet, the destination 2069 * options header should be put on the 1st part. 2070 * Otherwise, the header should be on the 2nd part. 2071 * (See RFC 2460, section 4.1) 2072 */ 2073 if (opt->ip6po_rthdr == NULL) { 2074 opt->ip6po_dest1 = 2075 (struct ip6_dest *)CMSG_DATA(cm); 2076 if (cm->cmsg_len != 2077 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2078 << 3)) 2079 return(EINVAL); 2080 } 2081 else { 2082 opt->ip6po_dest2 = 2083 (struct ip6_dest *)CMSG_DATA(cm); 2084 if (cm->cmsg_len != 2085 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2086 << 3)) 2087 return(EINVAL); 2088 } 2089 break; 2090 2091 case IPV6_RTHDR: 2092 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2093 return(EINVAL); 2094 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2095 if (cm->cmsg_len != 2096 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2097 return(EINVAL); 2098 switch(opt->ip6po_rthdr->ip6r_type) { 2099 case IPV6_RTHDR_TYPE_0: 2100 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2101 return(EINVAL); 2102 break; 2103 default: 2104 return(EINVAL); 2105 } 2106 break; 2107 2108 default: 2109 return(ENOPROTOOPT); 2110 } 2111 } 2112 2113 return(0); 2114 } 2115 2116 /* 2117 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2118 * packet to the input queue of a specified interface. Note that this 2119 * calls the output routine of the loopback "driver", but with an interface 2120 * pointer that might NOT be &loif -- easier than replicating that code here. 2121 */ 2122 void 2123 ip6_mloopback(ifp, m, dst) 2124 struct ifnet *ifp; 2125 register struct mbuf *m; 2126 register struct sockaddr_in6 *dst; 2127 { 2128 struct mbuf *copym; 2129 struct ip6_hdr *ip6; 2130 2131 copym = m_copy(m, 0, M_COPYALL); 2132 if (copym == NULL) 2133 return; 2134 2135 /* 2136 * Make sure to deep-copy IPv6 header portion in case the data 2137 * is in an mbuf cluster, so that we can safely override the IPv6 2138 * header portion later. 2139 */ 2140 if ((copym->m_flags & M_EXT) != 0 || 2141 copym->m_len < sizeof(struct ip6_hdr)) { 2142 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2143 if (copym == NULL) 2144 return; 2145 } 2146 2147 #ifdef DIAGNOSTIC 2148 if (copym->m_len < sizeof(*ip6)) { 2149 m_freem(copym); 2150 return; 2151 } 2152 #endif 2153 2154 #ifndef FAKE_LOOPBACK_IF 2155 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 2156 #else 2157 if (1) 2158 #endif 2159 { 2160 ip6 = mtod(copym, struct ip6_hdr *); 2161 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2162 ip6->ip6_src.s6_addr16[1] = 0; 2163 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2164 ip6->ip6_dst.s6_addr16[1] = 0; 2165 } 2166 2167 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2168 } 2169 2170 /* 2171 * Chop IPv6 header off from the payload. 2172 */ 2173 static int 2174 ip6_splithdr(m, exthdrs) 2175 struct mbuf *m; 2176 struct ip6_exthdrs *exthdrs; 2177 { 2178 struct mbuf *mh; 2179 struct ip6_hdr *ip6; 2180 2181 ip6 = mtod(m, struct ip6_hdr *); 2182 if (m->m_len > sizeof(*ip6)) { 2183 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2184 if (mh == 0) { 2185 m_freem(m); 2186 return ENOBUFS; 2187 } 2188 M_COPY_PKTHDR(mh, m); 2189 MH_ALIGN(mh, sizeof(*ip6)); 2190 m->m_flags &= ~M_PKTHDR; 2191 m->m_len -= sizeof(*ip6); 2192 m->m_data += sizeof(*ip6); 2193 mh->m_next = m; 2194 m = mh; 2195 m->m_len = sizeof(*ip6); 2196 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2197 } 2198 exthdrs->ip6e_ip6 = m; 2199 return 0; 2200 } 2201 2202 /* 2203 * Compute IPv6 extension header length. 2204 */ 2205 int 2206 ip6_optlen(in6p) 2207 struct in6pcb *in6p; 2208 { 2209 int len; 2210 2211 if (!in6p->in6p_outputopts) 2212 return 0; 2213 2214 len = 0; 2215 #define elen(x) \ 2216 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2217 2218 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2219 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2220 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2221 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2222 return len; 2223 #undef elen 2224 } 2225
Indexes created Tue Sep 23 01:09:51 GMT 2025