ip6_output.c revision 1.1.2.2
1 /* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * Copyright (c) 1982, 1986, 1988, 1990, 1993 32 * The Regents of the University of California. All rights reserved. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 3. All advertising materials mentioning features or use of this software 43 * must display the following acknowledgement: 44 * This product includes software developed by the University of 45 * California, Berkeley and its contributors. 46 * 4. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 63 */ 64 65 #ifdef __FreeBSD__ 66 #include "opt_ip6fw.h" 67 #endif 68 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 69 #include "opt_inet.h" 70 #ifdef __NetBSD__ /*XXX*/ 71 #include "opt_ipsec.h" 72 #endif 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/errno.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/systm.h> 83 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) 84 #include <sys/kernel.h> 85 #endif 86 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 87 #include <machine/pcpu.h> 88 #endif 89 #include <sys/proc.h> 90 91 #include <net/if.h> 92 #include <net/route.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #if defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802) 97 #include <netinet/in_systm.h> 98 #include <netinet/ip.h> 99 #endif 100 #include <netinet6/ip6.h> 101 #include <netinet6/icmp6.h> 102 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802) 103 #include <netinet/in_pcb.h> 104 #else 105 #include <netinet6/in6_pcb.h> 106 #endif 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/nd6.h> 109 110 #ifdef __OpenBSD__ /*KAME IPSEC*/ 111 #undef IPSEC 112 #endif 113 114 #ifdef IPSEC 115 #include <netinet6/ipsec.h> 116 #include <netkey/key.h> 117 #include <netkey/key_debug.h> 118 #endif /* IPSEC */ 119 120 #ifndef __bsdi__ 121 #include "loop.h" 122 #endif 123 124 #include <net/net_osdep.h> 125 126 #ifdef IPV6FIREWALL 127 #include <netinet6/ip6_fw.h> 128 #endif 129 130 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 131 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 132 #endif 133 134 struct ip6_exthdrs { 135 struct mbuf *ip6e_ip6; 136 struct mbuf *ip6e_hbh; 137 struct mbuf *ip6e_dest1; 138 struct mbuf *ip6e_rthdr; 139 struct mbuf *ip6e_dest2; 140 }; 141 142 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 143 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 144 struct socket *, struct sockopt *sopt)); 145 #else 146 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 147 struct socket *)); 148 #endif 149 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 150 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 151 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 152 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 153 struct ip6_frag **)); 154 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 155 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 156 #if (defined(__bsdi__) && _BSDI_VERSION < 199802) || defined(__OpenBSD__) 157 extern struct ifnet loif; 158 struct ifnet *loifp = &loif; 159 #endif 160 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 161 extern struct ifnet *loifp; 162 #endif 163 164 #ifdef __NetBSD__ 165 extern struct ifnet **ifindex2ifnet; 166 extern struct ifnet loif[NLOOP]; 167 #endif 168 169 /* 170 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 171 * header (with pri, len, nxt, hlim, src, dst). 172 * This function may modify ver and hlim only. 173 * The mbuf chain containing the packet will be freed. 174 * The mbuf opt, if present, will not be freed. 175 */ 176 int 177 ip6_output(m0, opt, ro, flags, im6o, ifpp) 178 struct mbuf *m0; 179 struct ip6_pktopts *opt; 180 struct route_in6 *ro; 181 int flags; 182 struct ip6_moptions *im6o; 183 struct ifnet **ifpp; /* XXX: just for statistics */ 184 { 185 struct ip6_hdr *ip6, *mhip6; 186 struct ifnet *ifp; 187 struct mbuf *m = m0; 188 int hlen, tlen, len, off; 189 struct route_in6 ip6route; 190 struct sockaddr_in6 *dst; 191 int error = 0; 192 struct in6_ifaddr *ia; 193 u_long mtu; 194 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 195 struct ip6_exthdrs exthdrs; 196 struct in6_addr finaldst; 197 struct route_in6 *ro_pmtu = NULL; 198 int hdrsplit = 0; 199 int needipsec = 0; 200 #ifdef IPSEC 201 int needipsectun = 0; 202 struct socket *so; 203 struct secpolicy *sp = NULL; 204 205 /* for AH processing. stupid to have "socket" variable in IP layer... */ 206 so = (struct socket *)m->m_pkthdr.rcvif; 207 m->m_pkthdr.rcvif = NULL; 208 ip6 = mtod(m, struct ip6_hdr *); 209 #endif /* IPSEC */ 210 211 #define MAKE_EXTHDR(hp,mp) \ 212 { \ 213 if (hp) { \ 214 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 215 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 216 ((eh)->ip6e_len + 1) << 3); \ 217 if (error) \ 218 goto freehdrs; \ 219 } \ 220 } 221 222 bzero(&exthdrs, sizeof(exthdrs)); 223 if (opt) { 224 /* Hop-by-Hop options header */ 225 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 226 /* Destination options header(1st part) */ 227 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 228 /* Routing header */ 229 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 230 /* Destination options header(2nd part) */ 231 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 232 } 233 234 #ifdef IPSEC 235 /* get a security policy for this packet */ 236 if (so == NULL) 237 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 238 else 239 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 240 241 if (sp == NULL) { 242 ipsec6stat.out_inval++; 243 goto bad; 244 } 245 246 error = 0; 247 248 /* check policy */ 249 switch (sp->policy) { 250 case IPSEC_POLICY_DISCARD: 251 /* 252 * This packet is just discarded. 253 */ 254 ipsec6stat.out_polvio++; 255 goto bad; 256 257 case IPSEC_POLICY_BYPASS: 258 case IPSEC_POLICY_NONE: 259 /* no need to do IPsec. */ 260 needipsec = 0; 261 break; 262 263 case IPSEC_POLICY_IPSEC: 264 if (sp->req == NULL) { 265 /* XXX should be panic ? */ 266 printf("ip6_output: No IPsec request specified.\n"); 267 error = EINVAL; 268 goto bad; 269 } 270 needipsec = 1; 271 break; 272 273 case IPSEC_POLICY_ENTRUST: 274 default: 275 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 276 } 277 #endif /* IPSEC */ 278 279 /* 280 * Calculate the total length of the extension header chain. 281 * Keep the length of the unfragmentable part for fragmentation. 282 */ 283 optlen = 0; 284 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 285 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 286 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 287 unfragpartlen = optlen + sizeof(struct ip6_hdr); 288 /* NOTE: we don't add AH/ESP length here. do that later. */ 289 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 290 291 /* 292 * If we need IPsec, or there is at least one extension header, 293 * separate IP6 header from the payload. 294 */ 295 if ((needipsec || optlen) && !hdrsplit) { 296 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 297 m = NULL; 298 goto freehdrs; 299 } 300 m = exthdrs.ip6e_ip6; 301 hdrsplit++; 302 } 303 304 /* adjust pointer */ 305 ip6 = mtod(m, struct ip6_hdr *); 306 307 /* adjust mbuf packet header length */ 308 m->m_pkthdr.len += optlen; 309 plen = m->m_pkthdr.len - sizeof(*ip6); 310 311 /* If this is a jumbo payload, insert a jumbo payload option. */ 312 if (plen > IPV6_MAXPACKET) { 313 if (!hdrsplit) { 314 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 315 m = NULL; 316 goto freehdrs; 317 } 318 m = exthdrs.ip6e_ip6; 319 hdrsplit++; 320 } 321 /* adjust pointer */ 322 ip6 = mtod(m, struct ip6_hdr *); 323 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 324 goto freehdrs; 325 ip6->ip6_plen = 0; 326 } else 327 ip6->ip6_plen = htons(plen); 328 329 /* 330 * Concatenate headers and fill in next header fields. 331 * Here we have, on "m" 332 * IPv6 payload 333 * and we insert headers accordingly. Finally, we should be getting: 334 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 335 * 336 * during the header composing process, "m" points to IPv6 header. 337 * "mprev" points to an extension header prior to esp. 338 */ 339 { 340 u_char *nexthdrp = &ip6->ip6_nxt; 341 struct mbuf *mprev = m; 342 343 /* 344 * we treat dest2 specially. this makes IPsec processing 345 * much easier. 346 * 347 * result: IPv6 dest2 payload 348 * m and mprev will point to IPv6 header. 349 */ 350 if (exthdrs.ip6e_dest2) { 351 if (!hdrsplit) 352 panic("assumption failed: hdr not split"); 353 exthdrs.ip6e_dest2->m_next = m->m_next; 354 m->m_next = exthdrs.ip6e_dest2; 355 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 356 ip6->ip6_nxt = IPPROTO_DSTOPTS; 357 } 358 359 #define MAKE_CHAIN(m,mp,p,i)\ 360 {\ 361 if (m) {\ 362 if (!hdrsplit) \ 363 panic("assumption failed: hdr not split"); \ 364 *mtod((m), u_char *) = *(p);\ 365 *(p) = (i);\ 366 p = mtod((m), u_char *);\ 367 (m)->m_next = (mp)->m_next;\ 368 (mp)->m_next = (m);\ 369 (mp) = (m);\ 370 }\ 371 } 372 /* 373 * result: IPv6 hbh dest1 rthdr dest2 payload 374 * m will point to IPv6 header. mprev will point to the 375 * extension header prior to dest2 (rthdr in the above case). 376 */ 377 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 378 nexthdrp, IPPROTO_HOPOPTS); 379 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 380 nexthdrp, IPPROTO_DSTOPTS); 381 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 382 nexthdrp, IPPROTO_ROUTING); 383 384 #ifdef IPSEC 385 if (!needipsec) 386 goto skip_ipsec2; 387 388 /* 389 * pointers after IPsec headers are not valid any more. 390 * other pointers need a great care too. 391 * (IPsec routines should not mangle mbufs prior to AH/ESP) 392 */ 393 exthdrs.ip6e_dest2 = NULL; 394 395 { 396 struct ip6_rthdr *rh = NULL; 397 int segleft_org = 0; 398 struct ipsec_output_state state; 399 400 if (exthdrs.ip6e_rthdr) { 401 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 402 segleft_org = rh->ip6r_segleft; 403 rh->ip6r_segleft = 0; 404 } 405 406 bzero(&state, sizeof(state)); 407 state.m = m; 408 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 409 &needipsectun); 410 m = state.m; 411 if (error) { 412 /* mbuf is already reclaimed in ipsec6_output_trans. */ 413 m = NULL; 414 switch (error) { 415 case EHOSTUNREACH: 416 case ENETUNREACH: 417 case EMSGSIZE: 418 case ENOBUFS: 419 case ENOMEM: 420 break; 421 default: 422 printf("ip6_output (ipsec): error code %d\n", error); 423 /*fall through*/ 424 case ENOENT: 425 /* don't show these error codes to the user */ 426 error = 0; 427 break; 428 } 429 goto bad; 430 } 431 if (exthdrs.ip6e_rthdr) { 432 /* ah6_output doesn't modify mbuf chain */ 433 rh->ip6r_segleft = segleft_org; 434 } 435 } 436 skip_ipsec2:; 437 #endif 438 } 439 440 /* 441 * If there is a routing header, replace destination address field 442 * with the first hop of the routing header. 443 */ 444 if (exthdrs.ip6e_rthdr) { 445 struct ip6_rthdr *rh = 446 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 447 struct ip6_rthdr *)); 448 struct ip6_rthdr0 *rh0; 449 450 finaldst = ip6->ip6_dst; 451 switch(rh->ip6r_type) { 452 case IPV6_RTHDR_TYPE_0: 453 rh0 = (struct ip6_rthdr0 *)rh; 454 ip6->ip6_dst = rh0->ip6r0_addr[0]; 455 bcopy((caddr_t)&rh0->ip6r0_addr[1], 456 (caddr_t)&rh0->ip6r0_addr[0], 457 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 458 ); 459 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 460 break; 461 default: /* is it possible? */ 462 error = EINVAL; 463 goto bad; 464 } 465 } 466 467 /* Source address validation */ 468 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 469 (flags & IPV6_DADOUTPUT) == 0) { 470 error = EOPNOTSUPP; 471 ip6stat.ip6s_badscope++; 472 goto bad; 473 } 474 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 475 error = EOPNOTSUPP; 476 ip6stat.ip6s_badscope++; 477 goto bad; 478 } 479 480 ip6stat.ip6s_localout++; 481 482 /* 483 * Route packet. 484 */ 485 if (ro == 0) { 486 ro = &ip6route; 487 bzero((caddr_t)ro, sizeof(*ro)); 488 } 489 ro_pmtu = ro; 490 if (opt && opt->ip6po_rthdr) 491 ro = &opt->ip6po_route; 492 dst = (struct sockaddr_in6 *)&ro->ro_dst; 493 /* 494 * If there is a cached route, 495 * check that it is to the same destination 496 * and is still up. If not, free it and try again. 497 */ 498 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 499 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 500 RTFREE(ro->ro_rt); 501 ro->ro_rt = (struct rtentry *)0; 502 } 503 if (ro->ro_rt == 0) { 504 bzero(dst, sizeof(*dst)); 505 dst->sin6_family = AF_INET6; 506 dst->sin6_len = sizeof(struct sockaddr_in6); 507 dst->sin6_addr = ip6->ip6_dst; 508 } 509 #ifdef IPSEC 510 if (needipsec && needipsectun) { 511 struct ipsec_output_state state; 512 513 /* 514 * All the extension headers will become inaccessible 515 * (since they can be encrypted). 516 * Don't panic, we need no more updates to extension headers 517 * on inner IPv6 packet (since they are now encapsulated). 518 * 519 * IPv6 [ESP|AH] IPv6 [extension headers] payload 520 */ 521 bzero(&exthdrs, sizeof(exthdrs)); 522 exthdrs.ip6e_ip6 = m; 523 524 bzero(&state, sizeof(state)); 525 state.m = m; 526 state.ro = (struct route *)ro; 527 state.dst = (struct sockaddr *)dst; 528 529 error = ipsec6_output_tunnel(&state, sp, flags); 530 531 m = state.m; 532 ro = (struct route_in6 *)state.ro; 533 dst = (struct sockaddr_in6 *)state.dst; 534 if (error) { 535 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 536 m0 = m = NULL; 537 m = NULL; 538 switch (error) { 539 case EHOSTUNREACH: 540 case ENETUNREACH: 541 case EMSGSIZE: 542 case ENOBUFS: 543 case ENOMEM: 544 break; 545 default: 546 printf("ip6_output (ipsec): error code %d\n", error); 547 /*fall through*/ 548 case ENOENT: 549 /* don't show these error codes to the user */ 550 error = 0; 551 break; 552 } 553 goto bad; 554 } 555 556 exthdrs.ip6e_ip6 = m; 557 } 558 #endif /*IPESC*/ 559 560 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 561 /* Unicast */ 562 563 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 564 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 565 /* xxx 566 * interface selection comes here 567 * if an interface is specified from an upper layer, 568 * ifp must point it. 569 */ 570 if (ro->ro_rt == 0) { 571 #if defined(__NetBSD__) || defined(__OpenBSD__) 572 /* 573 * NetBSD/OpenBSD always clones routes, if parent is 574 * PRF_CLONING. 575 */ 576 rtalloc((struct route *)ro); 577 #else 578 if (ro == &ip6route) /* xxx kazu */ 579 rtalloc((struct route *)ro); 580 else 581 rtcalloc((struct route *)ro); 582 #endif 583 } 584 if (ro->ro_rt == 0) { 585 ip6stat.ip6s_noroute++; 586 error = EHOSTUNREACH; 587 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 588 goto bad; 589 } 590 ia = ifatoia6(ro->ro_rt->rt_ifa); 591 ifp = ro->ro_rt->rt_ifp; 592 ro->ro_rt->rt_use++; 593 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 594 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 595 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 596 597 in6_ifstat_inc(ifp, ifs6_out_request); 598 599 /* 600 * Check if there is the outgoing interface conflicts with 601 * the interface specified by ifi6_ifindex(if specified). 602 * Note that loopback interface is always okay. 603 * (this happens when we are sending packet toward my 604 * interface) 605 */ 606 if (opt && opt->ip6po_pktinfo 607 && opt->ip6po_pktinfo->ipi6_ifindex) { 608 if (!(ifp->if_flags & IFF_LOOPBACK) 609 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 610 ip6stat.ip6s_noroute++; 611 in6_ifstat_inc(ifp, ifs6_out_discard); 612 error = EHOSTUNREACH; 613 goto bad; 614 } 615 } 616 617 if (opt && opt->ip6po_hlim != -1) 618 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 619 } else { 620 /* Multicast */ 621 struct in6_multi *in6m; 622 623 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 624 625 /* 626 * See if the caller provided any multicast options 627 */ 628 ifp = NULL; 629 if (im6o != NULL) { 630 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 631 if (im6o->im6o_multicast_ifp != NULL) 632 ifp = im6o->im6o_multicast_ifp; 633 } else 634 ip6->ip6_hlim = ip6_defmcasthlim; 635 636 /* 637 * See if the caller provided the outgoing interface 638 * as an ancillary data. 639 * Boundary check for ifindex is assumed to be already done. 640 */ 641 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 642 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 643 644 /* 645 * If the destination is a node-local scope multicast, 646 * the packet should be loop-backed only. 647 */ 648 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 649 /* 650 * If the outgoing interface is already specified, 651 * it should be a loopback interface. 652 */ 653 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 654 ip6stat.ip6s_badscope++; 655 error = ENETUNREACH; /* XXX: better error? */ 656 /* XXX correct ifp? */ 657 in6_ifstat_inc(ifp, ifs6_out_discard); 658 goto bad; 659 } 660 else { 661 #if defined(__bsdi__) || defined(__OpenBSD__) 662 ifp = loifp; 663 #else 664 ifp = &loif[0]; 665 #endif 666 } 667 } 668 669 if (opt && opt->ip6po_hlim != -1) 670 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 671 672 /* 673 * If caller did not provide an interface lookup a 674 * default in the routing table. This is either a 675 * default for the speicfied group (i.e. a host 676 * route), or a multicast default (a route for the 677 * ``net'' ff00::/8). 678 */ 679 if (ifp == NULL) { 680 if (ro->ro_rt == 0) { 681 ro->ro_rt = rtalloc1((struct sockaddr *) 682 &ro->ro_dst, 0 683 #ifdef __FreeBSD__ 684 , 0UL 685 #endif 686 ); 687 } 688 if (ro->ro_rt == 0) { 689 ip6stat.ip6s_noroute++; 690 error = EHOSTUNREACH; 691 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 692 goto bad; 693 } 694 ia = ifatoia6(ro->ro_rt->rt_ifa); 695 ifp = ro->ro_rt->rt_ifp; 696 ro->ro_rt->rt_use++; 697 } 698 699 if ((flags & IPV6_FORWARDING) == 0) 700 in6_ifstat_inc(ifp, ifs6_out_request); 701 in6_ifstat_inc(ifp, ifs6_out_mcast); 702 703 /* 704 * Confirm that the outgoing interface supports multicast. 705 */ 706 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 707 ip6stat.ip6s_noroute++; 708 in6_ifstat_inc(ifp, ifs6_out_discard); 709 error = ENETUNREACH; 710 goto bad; 711 } 712 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 713 if (in6m != NULL && 714 (im6o == NULL || im6o->im6o_multicast_loop)) { 715 /* 716 * If we belong to the destination multicast group 717 * on the outgoing interface, and the caller did not 718 * forbid loopback, loop back a copy. 719 */ 720 ip6_mloopback(ifp, m, dst); 721 } else { 722 /* 723 * If we are acting as a multicast router, perform 724 * multicast forwarding as if the packet had just 725 * arrived on the interface to which we are about 726 * to send. The multicast forwarding function 727 * recursively calls this function, using the 728 * IPV6_FORWARDING flag to prevent infinite recursion. 729 * 730 * Multicasts that are looped back by ip6_mloopback(), 731 * above, will be forwarded by the ip6_input() routine, 732 * if necessary. 733 */ 734 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 735 if (ip6_mforward(ip6, ifp, m) != NULL) { 736 m_freem(m); 737 goto done; 738 } 739 } 740 } 741 /* 742 * Multicasts with a hoplimit of zero may be looped back, 743 * above, but must not be transmitted on a network. 744 * Also, multicasts addressed to the loopback interface 745 * are not sent -- the above call to ip6_mloopback() will 746 * loop back a copy if this host actually belongs to the 747 * destination group on the loopback interface. 748 */ 749 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 750 m_freem(m); 751 goto done; 752 } 753 } 754 755 /* 756 * Fill the outgoing inteface to tell the upper layer 757 * to increment per-interface statistics. 758 */ 759 if (ifpp) 760 *ifpp = ifp; 761 762 /* 763 * Determine path MTU. 764 */ 765 if (ro_pmtu != ro) { 766 /* The first hop and the final destination may differ. */ 767 struct sockaddr_in6 *sin6_fin = 768 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 769 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 770 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 771 &finaldst))) { 772 RTFREE(ro_pmtu->ro_rt); 773 ro_pmtu->ro_rt = (struct rtentry *)0; 774 } 775 if (ro_pmtu->ro_rt == 0) { 776 bzero(sin6_fin, sizeof(*sin6_fin)); 777 sin6_fin->sin6_family = AF_INET6; 778 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 779 sin6_fin->sin6_addr = finaldst; 780 781 #ifdef __FreeBSD__ 782 rtcalloc((struct route *)ro_pmtu); 783 #else 784 rtalloc((struct route *)ro_pmtu); 785 #endif 786 } 787 } 788 if (ro_pmtu->ro_rt != NULL) { 789 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 790 791 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 792 if (mtu > ifmtu) { 793 /* 794 * The MTU on the route is larger than the MTU on 795 * the interface! This shouldn't happen, unless the 796 * MTU of the interface has been changed after the 797 * interface was brought up. Change the MTU in the 798 * route to match the interface MTU (as long as the 799 * field isn't locked). 800 */ 801 mtu = ifmtu; 802 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 803 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 804 } 805 } else { 806 mtu = nd_ifinfo[ifp->if_index].linkmtu; 807 } 808 809 /* 810 * Fake link-local scope-class addresses 811 */ 812 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 813 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 814 ip6->ip6_src.s6_addr16[1] = 0; 815 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 816 ip6->ip6_dst.s6_addr16[1] = 0; 817 } 818 819 #ifdef IPV6FIREWALL 820 /* 821 * Check with the firewall... 822 */ 823 if (ip6_fw_chk_ptr) { 824 u_short port = 0; 825 /* If ipfw says divert, we have to just drop packet */ 826 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 827 m_freem(m); 828 goto done; 829 } 830 if (!m) { 831 error = EACCES; 832 goto done; 833 } 834 } 835 #endif 836 837 /* 838 * If the outgoing packet contains a hop-by-hop options header, 839 * it must be examined and processed even by the source node. 840 * (RFC 2460, section 4.) 841 */ 842 if (exthdrs.ip6e_hbh) { 843 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, 844 struct ip6_hbh *); 845 u_int32_t dummy1; /* XXX unused */ 846 u_int32_t dummy2; /* XXX unused */ 847 848 /* 849 * XXX: if we have to send an ICMPv6 error to the sender, 850 * we need the M_LOOP flag since icmp6_error() expects 851 * the IPv6 and the hop-by-hop options header are 852 * continuous unless the flag is set. 853 */ 854 m->m_flags |= M_LOOP; 855 m->m_pkthdr.rcvif = ifp; 856 if (ip6_process_hopopts(m, 857 (u_int8_t *)(hbh + 1), 858 ((hbh->ip6h_len + 1) << 3) - 859 sizeof(struct ip6_hbh), 860 &dummy1, &dummy2) < 0) { 861 /* m was already freed at this point */ 862 error = EINVAL;/* better error? */ 863 goto done; 864 } 865 m->m_flags &= ~M_LOOP; /* XXX */ 866 m->m_pkthdr.rcvif = NULL; 867 } 868 869 /* 870 * Send the packet to the outgoing interface. 871 * If necessary, do IPv6 fragmentation before sending. 872 */ 873 tlen = m->m_pkthdr.len; 874 if (tlen <= mtu 875 #ifdef notyet 876 /* 877 * On any link that cannot convey a 1280-octet packet in one piece, 878 * link-specific fragmentation and reassembly must be provided at 879 * a layer below IPv6. [RFC 2460, sec.5] 880 * Thus if the interface has ability of link-level fragmentation, 881 * we can just send the packet even if the packet size is 882 * larger than the link's MTU. 883 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 884 */ 885 886 || ifp->if_flags & IFF_FRAGMENTABLE 887 #endif 888 ) 889 { 890 #if defined(__NetBSD__) && defined(IFA_STATS) 891 if (IFA_STATS) { 892 struct in6_ifaddr *ia6; 893 ip6 = mtod(m, struct ip6_hdr *); 894 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 895 if (ia6) { 896 ia->ia_ifa.ifa_data.ifad_outbytes += 897 m->m_pkthdr.len; 898 } 899 } 900 #endif 901 #ifdef OLDIP6OUTPUT 902 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 903 ro->ro_rt); 904 #else 905 error = nd6_output(ifp, m, dst, ro->ro_rt); 906 #endif 907 goto done; 908 } else if (mtu < IPV6_MMTU) { 909 /* 910 * note that path MTU is never less than IPV6_MMTU 911 * (see icmp6_input). 912 */ 913 error = EMSGSIZE; 914 in6_ifstat_inc(ifp, ifs6_out_fragfail); 915 goto bad; 916 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 917 error = EMSGSIZE; 918 in6_ifstat_inc(ifp, ifs6_out_fragfail); 919 goto bad; 920 } else { 921 struct mbuf **mnext, *m_frgpart; 922 struct ip6_frag *ip6f; 923 u_int32_t id = htonl(ip6_id++); 924 u_char nextproto; 925 926 /* 927 * Too large for the destination or interface; 928 * fragment if possible. 929 * Must be able to put at least 8 bytes per fragment. 930 */ 931 hlen = unfragpartlen; 932 if (mtu > IPV6_MAXPACKET) 933 mtu = IPV6_MAXPACKET; 934 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 935 if (len < 8) { 936 error = EMSGSIZE; 937 in6_ifstat_inc(ifp, ifs6_out_fragfail); 938 goto bad; 939 } 940 941 mnext = &m->m_nextpkt; 942 943 /* 944 * Change the next header field of the last header in the 945 * unfragmentable part. 946 */ 947 if (exthdrs.ip6e_rthdr) { 948 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 949 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 950 } 951 else if (exthdrs.ip6e_dest1) { 952 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 953 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 954 } 955 else if (exthdrs.ip6e_hbh) { 956 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 957 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 958 } 959 else { 960 nextproto = ip6->ip6_nxt; 961 ip6->ip6_nxt = IPPROTO_FRAGMENT; 962 } 963 964 /* 965 * Loop through length of segment after first fragment, 966 * make new header and copy data of each part and link onto chain. 967 */ 968 m0 = m; 969 for (off = hlen; off < tlen; off += len) { 970 MGETHDR(m, M_DONTWAIT, MT_HEADER); 971 if (!m) { 972 error = ENOBUFS; 973 ip6stat.ip6s_odropped++; 974 goto sendorfree; 975 } 976 m->m_flags = m0->m_flags & M_COPYFLAGS; 977 *mnext = m; 978 mnext = &m->m_nextpkt; 979 m->m_data += max_linkhdr; 980 mhip6 = mtod(m, struct ip6_hdr *); 981 *mhip6 = *ip6; 982 m->m_len = sizeof(*mhip6); 983 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 984 if (error) { 985 ip6stat.ip6s_odropped++; 986 goto sendorfree; 987 } 988 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 989 if (off + len >= tlen) 990 len = tlen - off; 991 else 992 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 993 mhip6->ip6_plen = htons((u_short)(len + hlen + 994 sizeof(*ip6f) - 995 sizeof(struct ip6_hdr))); 996 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 997 error = ENOBUFS; 998 ip6stat.ip6s_odropped++; 999 goto sendorfree; 1000 } 1001 m_cat(m, m_frgpart); 1002 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1003 m->m_pkthdr.rcvif = (struct ifnet *)0; 1004 ip6f->ip6f_reserved = 0; 1005 ip6f->ip6f_ident = id; 1006 ip6f->ip6f_nxt = nextproto; 1007 ip6stat.ip6s_ofragments++; 1008 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1009 } 1010 1011 in6_ifstat_inc(ifp, ifs6_out_fragok); 1012 } 1013 1014 /* 1015 * Remove leading garbages. 1016 */ 1017 sendorfree: 1018 m = m0->m_nextpkt; 1019 m0->m_nextpkt = 0; 1020 m_freem(m0); 1021 for (m0 = m; m; m = m0) { 1022 m0 = m->m_nextpkt; 1023 m->m_nextpkt = 0; 1024 if (error == 0) { 1025 #if defined(__NetBSD__) && defined(IFA_STATS) 1026 if (IFA_STATS) { 1027 struct in6_ifaddr *ia6; 1028 ip6 = mtod(m, struct ip6_hdr *); 1029 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1030 if (ia6) { 1031 ia->ia_ifa.ifa_data.ifad_outbytes += 1032 m->m_pkthdr.len; 1033 } 1034 } 1035 #endif 1036 #ifdef OLDIP6OUTPUT 1037 error = (*ifp->if_output)(ifp, m, 1038 (struct sockaddr *)dst, 1039 ro->ro_rt); 1040 #else 1041 error = nd6_output(ifp, m, dst, ro->ro_rt); 1042 #endif 1043 } 1044 else 1045 m_freem(m); 1046 } 1047 1048 if (error == 0) 1049 ip6stat.ip6s_fragmented++; 1050 1051 done: 1052 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1053 RTFREE(ro->ro_rt); 1054 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1055 RTFREE(ro_pmtu->ro_rt); 1056 } 1057 1058 #ifdef IPSEC 1059 if (sp != NULL) 1060 key_freesp(sp); 1061 #endif /* IPSEC */ 1062 1063 return(error); 1064 1065 freehdrs: 1066 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1067 m_freem(exthdrs.ip6e_dest1); 1068 m_freem(exthdrs.ip6e_rthdr); 1069 m_freem(exthdrs.ip6e_dest2); 1070 /* fall through */ 1071 bad: 1072 m_freem(m); 1073 goto done; 1074 } 1075 1076 static int 1077 ip6_copyexthdr(mp, hdr, hlen) 1078 struct mbuf **mp; 1079 caddr_t hdr; 1080 int hlen; 1081 { 1082 struct mbuf *m; 1083 1084 if (hlen > MCLBYTES) 1085 return(ENOBUFS); /* XXX */ 1086 1087 MGET(m, M_DONTWAIT, MT_DATA); 1088 if (!m) 1089 return(ENOBUFS); 1090 1091 if (hlen > MLEN) { 1092 MCLGET(m, M_DONTWAIT); 1093 if ((m->m_flags & M_EXT) == 0) { 1094 m_free(m); 1095 return(ENOBUFS); 1096 } 1097 } 1098 m->m_len = hlen; 1099 if (hdr) 1100 bcopy(hdr, mtod(m, caddr_t), hlen); 1101 1102 *mp = m; 1103 return(0); 1104 } 1105 1106 /* 1107 * Insert jumbo payload option. 1108 */ 1109 static int 1110 ip6_insert_jumboopt(exthdrs, plen) 1111 struct ip6_exthdrs *exthdrs; 1112 u_int32_t plen; 1113 { 1114 struct mbuf *mopt; 1115 u_char *optbuf; 1116 1117 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1118 1119 /* 1120 * If there is no hop-by-hop options header, allocate new one. 1121 * If there is one but it doesn't have enough space to store the 1122 * jumbo payload option, allocate a cluster to store the whole options. 1123 * Otherwise, use it to store the options. 1124 */ 1125 if (exthdrs->ip6e_hbh == 0) { 1126 MGET(mopt, M_DONTWAIT, MT_DATA); 1127 if (mopt == 0) 1128 return(ENOBUFS); 1129 mopt->m_len = JUMBOOPTLEN; 1130 optbuf = mtod(mopt, u_char *); 1131 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1132 exthdrs->ip6e_hbh = mopt; 1133 } 1134 else { 1135 struct ip6_hbh *hbh; 1136 1137 mopt = exthdrs->ip6e_hbh; 1138 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1139 caddr_t oldoptp = mtod(mopt, caddr_t); 1140 int oldoptlen = mopt->m_len; 1141 1142 if (mopt->m_flags & M_EXT) 1143 return(ENOBUFS); /* XXX */ 1144 MCLGET(mopt, M_DONTWAIT); 1145 if ((mopt->m_flags & M_EXT) == 0) 1146 return(ENOBUFS); 1147 1148 bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); 1149 optbuf = mtod(mopt, caddr_t) + oldoptlen; 1150 mopt->m_len = oldoptlen + JUMBOOPTLEN; 1151 } 1152 else { 1153 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1154 mopt->m_len += JUMBOOPTLEN; 1155 } 1156 optbuf[0] = IP6OPT_PADN; 1157 optbuf[1] = 1; 1158 1159 /* 1160 * Adjust the header length according to the pad and 1161 * the jumbo payload option. 1162 */ 1163 hbh = mtod(mopt, struct ip6_hbh *); 1164 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1165 } 1166 1167 /* fill in the option. */ 1168 optbuf[2] = IP6OPT_JUMBO; 1169 optbuf[3] = 4; 1170 *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); 1171 1172 /* finally, adjust the packet header length */ 1173 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1174 1175 return(0); 1176 #undef JUMBOOPTLEN 1177 } 1178 1179 /* 1180 * Insert fragment header and copy unfragmentable header portions. 1181 */ 1182 static int 1183 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1184 struct mbuf *m0, *m; 1185 int hlen; 1186 struct ip6_frag **frghdrp; 1187 { 1188 struct mbuf *n, *mlast; 1189 1190 if (hlen > sizeof(struct ip6_hdr)) { 1191 n = m_copym(m0, sizeof(struct ip6_hdr), 1192 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1193 if (n == 0) 1194 return(ENOBUFS); 1195 m->m_next = n; 1196 } 1197 else 1198 n = m; 1199 1200 /* Search for the last mbuf of unfragmentable part. */ 1201 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1202 ; 1203 1204 if ((mlast->m_flags & M_EXT) == 0 && 1205 M_TRAILINGSPACE(mlast) < sizeof(struct ip6_frag)) { 1206 /* use the trailing space of the last mbuf for the fragment hdr */ 1207 *frghdrp = 1208 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1209 mlast->m_len += sizeof(struct ip6_frag); 1210 m->m_pkthdr.len += sizeof(struct ip6_frag); 1211 } 1212 else { 1213 /* allocate a new mbuf for the fragment header */ 1214 struct mbuf *mfrg; 1215 1216 MGET(mfrg, M_DONTWAIT, MT_DATA); 1217 if (mfrg == 0) 1218 return(ENOBUFS); 1219 mfrg->m_len = sizeof(struct ip6_frag); 1220 *frghdrp = mtod(mfrg, struct ip6_frag *); 1221 mlast->m_next = mfrg; 1222 } 1223 1224 return(0); 1225 } 1226 1227 /* 1228 * IP6 socket option processing. 1229 */ 1230 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1231 int 1232 ip6_ctloutput(so, sopt) 1233 struct socket *so; 1234 struct sockopt *sopt; 1235 #else 1236 int 1237 ip6_ctloutput(op, so, level, optname, mp) 1238 int op; 1239 struct socket *so; 1240 int level, optname; 1241 struct mbuf **mp; 1242 #endif 1243 { 1244 int privileged; 1245 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1246 register struct inpcb *in6p = sotoinpcb(so); 1247 int error, optval; 1248 int level, op, optname; 1249 int optlen; 1250 struct proc *p; 1251 1252 if (sopt) { 1253 level = sopt->sopt_level; 1254 op = sopt->sopt_dir; 1255 optname = sopt->sopt_name; 1256 optlen = sopt->sopt_valsize; 1257 p = sopt->sopt_p; 1258 } else { 1259 panic("ip6_ctloutput: arg soopt is NULL"); 1260 } 1261 #else 1262 #ifdef HAVE_NRL_INPCB 1263 register struct inpcb *inp = sotoinpcb(so); 1264 #else 1265 register struct in6pcb *in6p = sotoin6pcb(so); 1266 #endif 1267 register struct mbuf *m = *mp; 1268 int error, optval; 1269 int optlen; 1270 #if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3) 1271 struct proc *p = curproc; /* XXX */ 1272 #endif 1273 1274 optlen = m ? m->m_len : 0; 1275 #endif 1276 error = optval = 0; 1277 1278 #if defined(__NetBSD__) || (defined(__FreeBSD__) && __FreeBSD__ >= 3) 1279 privileged = (p == 0 || suser(p->p_ucred, &p->p_acflag)) ? 0 : 1; 1280 #else 1281 #ifdef HAVE_NRL_INPCB 1282 privileged = (inp->inp_socket->so_state & SS_PRIV); 1283 #else 1284 privileged = (in6p->in6p_socket->so_state & SS_PRIV); 1285 #endif 1286 #endif 1287 1288 if (level == IPPROTO_IPV6) { 1289 switch (op) { 1290 1291 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1292 case SOPT_SET: 1293 #else 1294 case PRCO_SETOPT: 1295 #endif 1296 switch (optname) { 1297 case IPV6_PKTOPTIONS: 1298 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1299 { 1300 struct mbuf *m; 1301 1302 error = soopt_getm(sopt, &m); /* XXX */ 1303 if (error != NULL) 1304 break; 1305 error = soopt_mcopyin(sopt, m); /* XXX */ 1306 if (error != NULL) 1307 break; 1308 return (ip6_pcbopts(&in6p->in6p_outputopts, 1309 m, so, sopt)); 1310 } 1311 #else 1312 #ifdef HAVE_NRL_INPCB 1313 return(ip6_pcbopts(&inp->inp_outputopts6, 1314 m, so)); 1315 #else 1316 return(ip6_pcbopts(&in6p->in6p_outputopts, 1317 m, so)); 1318 #endif 1319 #endif 1320 case IPV6_HOPOPTS: 1321 case IPV6_DSTOPTS: 1322 if (!privileged) { 1323 error = EPERM; 1324 break; 1325 } 1326 /* fall through */ 1327 case IPV6_UNICAST_HOPS: 1328 case IPV6_RECVOPTS: 1329 case IPV6_RECVRETOPTS: 1330 case IPV6_RECVDSTADDR: 1331 case IPV6_PKTINFO: 1332 case IPV6_HOPLIMIT: 1333 case IPV6_RTHDR: 1334 case IPV6_CHECKSUM: 1335 case IPV6_FAITH: 1336 #ifdef MAPPED_ADDR_ENABLED 1337 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1338 case IPV6_BINDV6ONLY: 1339 #endif 1340 #endif /* MAPPED_ADDR_ENABLED */ 1341 if (optlen != sizeof(int)) 1342 error = EINVAL; 1343 else { 1344 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1345 error = sooptcopyin(sopt, &optval, 1346 sizeof optval, sizeof optval); 1347 if (error) 1348 break; 1349 #else 1350 optval = *mtod(m, int *); 1351 #endif 1352 switch (optname) { 1353 1354 case IPV6_UNICAST_HOPS: 1355 if (optval < -1 || optval >= 256) 1356 error = EINVAL; 1357 else { 1358 /* -1 = kernel default */ 1359 #ifdef HAVE_NRL_INPCB 1360 inp->inp_hops = optval; 1361 #else 1362 in6p->in6p_hops = optval; 1363 1364 #if defined(MAPPED_ADDR_ENABLED) 1365 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1366 if ((in6p->in6p_vflag & 1367 INP_IPV4) != 0) 1368 in6p->inp_ip_ttl = optval; 1369 #endif 1370 #endif 1371 #endif 1372 } 1373 break; 1374 #ifdef HAVE_NRL_INPCB 1375 #define OPTSET(bit) \ 1376 if (optval) \ 1377 inp->inp_flags |= bit; \ 1378 else \ 1379 inp->inp_flags &= ~bit; 1380 #else 1381 #define OPTSET(bit) \ 1382 if (optval) \ 1383 in6p->in6p_flags |= bit; \ 1384 else \ 1385 in6p->in6p_flags &= ~bit; 1386 #endif 1387 1388 case IPV6_RECVOPTS: 1389 OPTSET(IN6P_RECVOPTS); 1390 break; 1391 1392 case IPV6_RECVRETOPTS: 1393 OPTSET(IN6P_RECVRETOPTS); 1394 break; 1395 1396 case IPV6_RECVDSTADDR: 1397 OPTSET(IN6P_RECVDSTADDR); 1398 break; 1399 1400 case IPV6_PKTINFO: 1401 OPTSET(IN6P_PKTINFO); 1402 break; 1403 1404 case IPV6_HOPLIMIT: 1405 OPTSET(IN6P_HOPLIMIT); 1406 break; 1407 1408 case IPV6_HOPOPTS: 1409 OPTSET(IN6P_HOPOPTS); 1410 break; 1411 1412 case IPV6_DSTOPTS: 1413 OPTSET(IN6P_DSTOPTS); 1414 break; 1415 1416 case IPV6_RTHDR: 1417 OPTSET(IN6P_RTHDR); 1418 break; 1419 1420 case IPV6_CHECKSUM: 1421 #ifdef HAVE_NRL_INPCB 1422 inp->inp_csumoffset = optval; 1423 #else 1424 in6p->in6p_cksum = optval; 1425 #endif 1426 break; 1427 1428 case IPV6_FAITH: 1429 OPTSET(IN6P_FAITH); 1430 break; 1431 1432 #ifdef MAPPED_ADDR_ENABLED 1433 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1434 case IPV6_BINDV6ONLY: 1435 OPTSET(IN6P_BINDV6ONLY); 1436 break; 1437 #endif 1438 #endif /* MAPPED_ADDR_ENABLED */ 1439 } 1440 } 1441 break; 1442 #undef OPTSET 1443 1444 case IPV6_MULTICAST_IF: 1445 case IPV6_MULTICAST_HOPS: 1446 case IPV6_MULTICAST_LOOP: 1447 case IPV6_JOIN_GROUP: 1448 case IPV6_LEAVE_GROUP: 1449 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1450 { 1451 struct mbuf *m; 1452 if (sopt->sopt_valsize > MLEN) { 1453 error = EMSGSIZE; 1454 break; 1455 } 1456 /* XXX */ 1457 MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); 1458 if (m == 0) { 1459 error = ENOBUFS; 1460 break; 1461 } 1462 m->m_len = sopt->sopt_valsize; 1463 error = sooptcopyin(sopt, mtod(m, char *), 1464 m->m_len, m->m_len); 1465 error = ip6_setmoptions(sopt->sopt_name, 1466 &in6p->in6p_moptions, 1467 m); 1468 (void)m_free(m); 1469 } 1470 #else 1471 #ifdef HAVE_NRL_INPCB 1472 error = ip6_setmoptions(optname, 1473 &inp->inp_moptions6, m); 1474 #else 1475 error = ip6_setmoptions(optname, 1476 &in6p->in6p_moptions, m); 1477 #endif 1478 #endif 1479 break; 1480 1481 #ifndef __bsdi__ 1482 case IPV6_PORTRANGE: 1483 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1484 error = sooptcopyin(sopt, &optval, sizeof optval, 1485 sizeof optval); 1486 if (error) 1487 break; 1488 #else 1489 optval = *mtod(m, int *); 1490 #endif 1491 1492 #ifdef HAVE_NRL_INPCB 1493 # define in6p inp 1494 # define in6p_flags inp_flags 1495 #endif 1496 switch (optval) { 1497 case IPV6_PORTRANGE_DEFAULT: 1498 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1499 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1500 break; 1501 1502 case IPV6_PORTRANGE_HIGH: 1503 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1504 in6p->in6p_flags |= IN6P_HIGHPORT; 1505 break; 1506 1507 case IPV6_PORTRANGE_LOW: 1508 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1509 in6p->in6p_flags |= IN6P_LOWPORT; 1510 break; 1511 1512 default: 1513 error = EINVAL; 1514 break; 1515 } 1516 #ifdef HAVE_NRL_INPCB 1517 # undef in6p 1518 # undef in6p_flags 1519 #endif 1520 break; 1521 #endif 1522 1523 #ifdef IPSEC 1524 case IPV6_IPSEC_POLICY: 1525 { 1526 caddr_t req = NULL; 1527 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1528 struct mbuf *m; 1529 #endif 1530 1531 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1532 if (error = soopt_getm(sopt, &m)) /* XXX */ 1533 break; 1534 if (error = soopt_mcopyin(sopt, m)) /* XXX */ 1535 break; 1536 #endif 1537 if (m != 0) 1538 req = mtod(m, caddr_t); 1539 error = ipsec6_set_policy(in6p, optname, req, 1540 privileged); 1541 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1542 m_freem(m); 1543 #endif 1544 } 1545 break; 1546 #endif /* IPSEC */ 1547 1548 #ifdef IPV6FIREWALL 1549 case IPV6_FW_ADD: 1550 case IPV6_FW_DEL: 1551 case IPV6_FW_FLUSH: 1552 case IPV6_FW_ZERO: 1553 { 1554 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1555 struct mbuf *m; 1556 struct mbuf **mp = &m; 1557 #endif 1558 1559 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1560 if (ip6_fw_ctl_ptr == NULL) 1561 return EINVAL; 1562 if (error = soopt_getm(sopt, &m)) /* XXX */ 1563 break; 1564 if (error = soopt_mcopyin(sopt, m)) /* XXX */ 1565 break; 1566 #else 1567 if (ip6_fw_ctl_ptr == NULL) { 1568 if (m) (void)m_free(m); 1569 return EINVAL; 1570 } 1571 #endif 1572 error = (*ip6_fw_ctl_ptr)(optname, mp); 1573 m = *mp; 1574 } 1575 break; 1576 #endif 1577 1578 default: 1579 error = ENOPROTOOPT; 1580 break; 1581 } 1582 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 1583 if (m) 1584 (void)m_free(m); 1585 #endif 1586 break; 1587 1588 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1589 case SOPT_GET: 1590 #else 1591 case PRCO_GETOPT: 1592 #endif 1593 switch (optname) { 1594 1595 case IPV6_OPTIONS: 1596 case IPV6_RETOPTS: 1597 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1598 #if 0 1599 if (in6p->in6p_options) { 1600 error = sooptcopyout(sopt, 1601 mtod(in6p->in6p_options, 1602 char *), 1603 in6p->in6p_options->m_len); 1604 } else 1605 sopt->sopt_valsize = 0; 1606 break; 1607 #else 1608 error = ENOPROTOOPT; 1609 break; 1610 #endif 1611 #else 1612 #if 0 1613 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1614 if (in6p->in6p_options) { 1615 m->m_len = in6p->in6p_options->m_len; 1616 bcopy(mtod(in6p->in6p_options, caddr_t), 1617 mtod(m, caddr_t), 1618 (unsigned)m->m_len); 1619 } else 1620 m->m_len = 0; 1621 break; 1622 #else 1623 error = ENOPROTOOPT; 1624 break; 1625 #endif 1626 #endif 1627 1628 case IPV6_PKTOPTIONS: 1629 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1630 if (in6p->in6p_options) { 1631 error = soopt_mcopyout(sopt, 1632 in6p->in6p_options); 1633 } else 1634 sopt->sopt_valsize = 0; 1635 #elif defined(HAVE_NRL_INPCB) 1636 if (inp->inp_options) { 1637 *mp = m_copym(inp->inp_options, 0, 1638 M_COPYALL, M_WAIT); 1639 } else { 1640 *mp = m_get(M_WAIT, MT_SOOPTS); 1641 (*mp)->m_len = 0; 1642 } 1643 #else 1644 if (in6p->in6p_options) { 1645 *mp = m_copym(in6p->in6p_options, 0, 1646 M_COPYALL, M_WAIT); 1647 } else { 1648 *mp = m_get(M_WAIT, MT_SOOPTS); 1649 (*mp)->m_len = 0; 1650 } 1651 #endif 1652 break; 1653 1654 case IPV6_HOPOPTS: 1655 case IPV6_DSTOPTS: 1656 if (!privileged) { 1657 error = EPERM; 1658 break; 1659 } 1660 /* fall through */ 1661 case IPV6_UNICAST_HOPS: 1662 case IPV6_RECVOPTS: 1663 case IPV6_RECVRETOPTS: 1664 case IPV6_RECVDSTADDR: 1665 case IPV6_PKTINFO: 1666 case IPV6_HOPLIMIT: 1667 case IPV6_RTHDR: 1668 case IPV6_CHECKSUM: 1669 case IPV6_FAITH: 1670 #ifdef MAPPED_ADDR_ENABLED 1671 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1672 case IPV6_BINDV6ONLY: 1673 #endif 1674 #endif /* MAPPED_ADDR_ENABLED */ 1675 switch (optname) { 1676 1677 case IPV6_UNICAST_HOPS: 1678 #ifdef HAVE_NRL_INPCB 1679 optval = inp->inp_hops; 1680 #else 1681 optval = in6p->in6p_hops; 1682 #endif 1683 break; 1684 1685 #ifdef HAVE_NRL_INPCB 1686 #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) 1687 #else 1688 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1689 #endif 1690 1691 case IPV6_RECVOPTS: 1692 optval = OPTBIT(IN6P_RECVOPTS); 1693 break; 1694 1695 case IPV6_RECVRETOPTS: 1696 optval = OPTBIT(IN6P_RECVRETOPTS); 1697 break; 1698 1699 case IPV6_RECVDSTADDR: 1700 optval = OPTBIT(IN6P_RECVDSTADDR); 1701 break; 1702 1703 case IPV6_PKTINFO: 1704 optval = OPTBIT(IN6P_PKTINFO); 1705 break; 1706 1707 case IPV6_HOPLIMIT: 1708 optval = OPTBIT(IN6P_HOPLIMIT); 1709 break; 1710 1711 case IPV6_HOPOPTS: 1712 optval = OPTBIT(IN6P_HOPOPTS); 1713 break; 1714 1715 case IPV6_DSTOPTS: 1716 optval = OPTBIT(IN6P_DSTOPTS); 1717 break; 1718 1719 case IPV6_RTHDR: 1720 optval = OPTBIT(IN6P_RTHDR); 1721 break; 1722 1723 case IPV6_CHECKSUM: 1724 #ifdef HAVE_NRL_INPCB 1725 optval = inp->inp_csumoffset; 1726 #else 1727 optval = in6p->in6p_cksum; 1728 #endif 1729 break; 1730 1731 case IPV6_FAITH: 1732 optval = OPTBIT(IN6P_FAITH); 1733 break; 1734 1735 #ifdef MAPPED_ADDR_ENABLED 1736 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1737 case IPV6_BINDV6ONLY: 1738 optval = OPTBIT(IN6P_BINDV6ONLY); 1739 break; 1740 #endif 1741 #endif /* MAPPED_ADDR_ENABLED */ 1742 1743 #ifndef __bsdi__ 1744 case IPV6_PORTRANGE: 1745 { 1746 int flags; 1747 #ifdef HAVE_NRL_INPCB 1748 flags = inp->inp_flags; 1749 #else 1750 flags = in6p->in6p_flags; 1751 #endif 1752 if (flags & IN6P_HIGHPORT) 1753 optval = IPV6_PORTRANGE_HIGH; 1754 else if (flags & IN6P_LOWPORT) 1755 optval = IPV6_PORTRANGE_LOW; 1756 else 1757 optval = 0; 1758 break; 1759 } 1760 #endif 1761 } 1762 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1763 error = sooptcopyout(sopt, &optval, 1764 sizeof optval); 1765 #else 1766 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1767 m->m_len = sizeof(int); 1768 *mtod(m, int *) = optval; 1769 #endif 1770 break; 1771 1772 case IPV6_MULTICAST_IF: 1773 case IPV6_MULTICAST_HOPS: 1774 case IPV6_MULTICAST_LOOP: 1775 case IPV6_JOIN_GROUP: 1776 case IPV6_LEAVE_GROUP: 1777 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1778 { 1779 struct mbuf *m; 1780 error = ip6_getmoptions(sopt->sopt_name, 1781 in6p->in6p_moptions, &m); 1782 if (error == 0) 1783 error = sooptcopyout(sopt, 1784 mtod(m, char *), m->m_len); 1785 m_freem(m); 1786 } 1787 #elif defined(HAVE_NRL_INPCB) 1788 error = ip6_getmoptions(optname, inp->inp_moptions6, mp); 1789 #else 1790 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1791 #endif 1792 break; 1793 1794 #ifdef IPSEC 1795 case IPV6_IPSEC_POLICY: 1796 { 1797 caddr_t req = NULL; 1798 int len = 0; 1799 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1800 struct mbuf *m; 1801 struct mbuf **mp = &m; 1802 #endif 1803 if (m != 0) { 1804 req = mtod(m, caddr_t); 1805 len = m->m_len; 1806 } 1807 error = ipsec6_get_policy(in6p, req, mp); 1808 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1809 if (error == 0) 1810 error = soopt_mcopyout(sopt, m); /*XXX*/ 1811 m_freem(m); 1812 #endif 1813 break; 1814 } 1815 #endif /* IPSEC */ 1816 1817 #ifdef IPV6FIREWALL 1818 case IPV6_FW_GET: 1819 { 1820 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1821 struct mbuf *m; 1822 struct mbuf **mp = &m; 1823 #endif 1824 1825 if (ip6_fw_ctl_ptr == NULL) 1826 { 1827 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 1828 if (m) 1829 (void)m_free(m); 1830 #endif 1831 return EINVAL; 1832 } 1833 error = (*ip6_fw_ctl_ptr)(optname, mp); 1834 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1835 if (error == 0) 1836 error = soopt_mcopyout(sopt, m); /* XXX */ 1837 if (m) 1838 m_freem(m); 1839 #endif 1840 } 1841 break; 1842 #endif 1843 1844 default: 1845 error = ENOPROTOOPT; 1846 break; 1847 } 1848 break; 1849 } 1850 } else { 1851 error = EINVAL; 1852 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 1853 if (op == PRCO_SETOPT && *mp) 1854 (void)m_free(*mp); 1855 #endif 1856 } 1857 return(error); 1858 } 1859 1860 /* 1861 * Set up IP6 options in pcb for insertion in output packets. 1862 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1863 * with destination address if source routed. 1864 */ 1865 static int 1866 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1867 ip6_pcbopts(pktopt, m, so, sopt) 1868 #else 1869 ip6_pcbopts(pktopt, m, so) 1870 #endif 1871 struct ip6_pktopts **pktopt; 1872 register struct mbuf *m; 1873 struct socket *so; 1874 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1875 struct sockopt *sopt; 1876 #endif 1877 { 1878 register struct ip6_pktopts *opt = *pktopt; 1879 int error = 0; 1880 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 1881 struct proc *p = sopt->sopt_p; 1882 #elif defined(__bsdi__) && _BSDI_VERSION >= 199802 1883 struct proc *p = PCPU(curproc); /* XXX */ 1884 #else 1885 struct proc *p = curproc; /* XXX */ 1886 #endif 1887 int priv = 0; 1888 1889 /* turn off any old options. */ 1890 if (opt) { 1891 if (opt->ip6po_m) 1892 (void)m_free(opt->ip6po_m); 1893 } 1894 else 1895 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1896 *pktopt = 0; 1897 1898 if (!m || m->m_len == 0) { 1899 /* 1900 * Only turning off any previous options. 1901 */ 1902 if (opt) 1903 free(opt, M_IP6OPT); 1904 if (m) 1905 (void)m_free(m); 1906 return(0); 1907 } 1908 1909 /* set options specified by user. */ 1910 if (p && !suser(p->p_ucred, &p->p_acflag)) 1911 priv = 1; 1912 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1913 (void)m_free(m); 1914 return(error); 1915 } 1916 *pktopt = opt; 1917 return(0); 1918 } 1919 1920 /* 1921 * Set the IP6 multicast options in response to user setsockopt(). 1922 */ 1923 static int 1924 ip6_setmoptions(optname, im6op, m) 1925 int optname; 1926 struct ip6_moptions **im6op; 1927 struct mbuf *m; 1928 { 1929 int error = 0; 1930 u_int loop, ifindex; 1931 struct ipv6_mreq *mreq; 1932 struct ifnet *ifp; 1933 struct ip6_moptions *im6o = *im6op; 1934 struct route_in6 ro; 1935 struct sockaddr_in6 *dst; 1936 struct in6_multi_mship *imm; 1937 #if defined(__bsdi__) && _BSDI_VERSION >= 199802 1938 struct proc *p = PCPU(curproc); /* XXX */ 1939 #else 1940 struct proc *p = curproc; /* XXX */ 1941 #endif 1942 1943 if (im6o == NULL) { 1944 /* 1945 * No multicast option buffer attached to the pcb; 1946 * allocate one and initialize to default values. 1947 */ 1948 im6o = (struct ip6_moptions *) 1949 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1950 1951 if (im6o == NULL) 1952 return(ENOBUFS); 1953 *im6op = im6o; 1954 im6o->im6o_multicast_ifp = NULL; 1955 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1956 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1957 LIST_INIT(&im6o->im6o_memberships); 1958 } 1959 1960 switch (optname) { 1961 1962 case IPV6_MULTICAST_IF: 1963 /* 1964 * Select the interface for outgoing multicast packets. 1965 */ 1966 if (m == NULL || m->m_len != sizeof(u_int)) { 1967 error = EINVAL; 1968 break; 1969 } 1970 ifindex = *(mtod(m, u_int *)); 1971 if (ifindex < 0 || if_index < ifindex) { 1972 error = ENXIO; /* XXX EINVAL? */ 1973 break; 1974 } 1975 ifp = ifindex2ifnet[ifindex]; 1976 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1977 error = EADDRNOTAVAIL; 1978 break; 1979 } 1980 im6o->im6o_multicast_ifp = ifp; 1981 break; 1982 1983 case IPV6_MULTICAST_HOPS: 1984 { 1985 /* 1986 * Set the IP6 hoplimit for outgoing multicast packets. 1987 */ 1988 int optval; 1989 if (m == NULL || m->m_len != sizeof(int)) { 1990 error = EINVAL; 1991 break; 1992 } 1993 optval = *(mtod(m, u_int *)); 1994 if (optval < -1 || optval >= 256) 1995 error = EINVAL; 1996 else if (optval == -1) 1997 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1998 else 1999 im6o->im6o_multicast_hlim = optval; 2000 break; 2001 } 2002 2003 case IPV6_MULTICAST_LOOP: 2004 /* 2005 * Set the loopback flag for outgoing multicast packets. 2006 * Must be zero or one. 2007 */ 2008 if (m == NULL || m->m_len != sizeof(u_int) || 2009 (loop = *(mtod(m, u_int *))) > 1) { 2010 error = EINVAL; 2011 break; 2012 } 2013 im6o->im6o_multicast_loop = loop; 2014 break; 2015 2016 case IPV6_JOIN_GROUP: 2017 /* 2018 * Add a multicast group membership. 2019 * Group must be a valid IP6 multicast address. 2020 */ 2021 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2022 error = EINVAL; 2023 break; 2024 } 2025 mreq = mtod(m, struct ipv6_mreq *); 2026 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2027 /* 2028 * We use the unspecified address to specify to accept 2029 * all multicast addresses. Only super user is allowed 2030 * to do this. 2031 */ 2032 if (suser(p->p_ucred, &p->p_acflag)) { 2033 error = EACCES; 2034 break; 2035 } 2036 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2037 error = EINVAL; 2038 break; 2039 } 2040 2041 /* 2042 * If the interface is specified, validate it. 2043 */ 2044 if (mreq->ipv6mr_interface < 0 2045 || if_index < mreq->ipv6mr_interface) { 2046 error = ENXIO; /* XXX EINVAL? */ 2047 break; 2048 } 2049 /* 2050 * If no interface was explicitly specified, choose an 2051 * appropriate one according to the given multicast address. 2052 */ 2053 if (mreq->ipv6mr_interface == 0) { 2054 /* 2055 * If the multicast address is in node-local scope, 2056 * the interface should be a loopback interface. 2057 * Otherwise, look up the routing table for the 2058 * address, and choose the outgoing interface. 2059 * XXX: is it a good approach? 2060 */ 2061 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2062 #if defined(__bsdi__) || defined(__OpenBSD__) 2063 ifp = loifp; 2064 #else 2065 ifp = &loif[0]; 2066 #endif 2067 } 2068 else { 2069 ro.ro_rt = NULL; 2070 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2071 bzero(dst, sizeof(*dst)); 2072 dst->sin6_len = sizeof(struct sockaddr_in6); 2073 dst->sin6_family = AF_INET6; 2074 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2075 rtalloc((struct route *)&ro); 2076 if (ro.ro_rt == NULL) { 2077 error = EADDRNOTAVAIL; 2078 break; 2079 } 2080 ifp = ro.ro_rt->rt_ifp; 2081 rtfree(ro.ro_rt); 2082 } 2083 } else 2084 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2085 2086 /* 2087 * See if we found an interface, and confirm that it 2088 * supports multicast 2089 */ 2090 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2091 error = EADDRNOTAVAIL; 2092 break; 2093 } 2094 /* 2095 * Put interface index into the multicast address, 2096 * if the address has link-local scope. 2097 */ 2098 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2099 mreq->ipv6mr_multiaddr.s6_addr16[1] 2100 = htons(mreq->ipv6mr_interface); 2101 } 2102 /* 2103 * See if the membership already exists. 2104 */ 2105 for (imm = im6o->im6o_memberships.lh_first; 2106 imm != NULL; imm = imm->i6mm_chain.le_next) 2107 if (imm->i6mm_maddr->in6m_ifp == ifp && 2108 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2109 &mreq->ipv6mr_multiaddr)) 2110 break; 2111 if (imm != NULL) { 2112 error = EADDRINUSE; 2113 break; 2114 } 2115 /* 2116 * Everything looks good; add a new record to the multicast 2117 * address list for the given interface. 2118 */ 2119 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2120 if (imm == NULL) { 2121 error = ENOBUFS; 2122 break; 2123 } 2124 if ((imm->i6mm_maddr = 2125 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2126 free(imm, M_IPMADDR); 2127 break; 2128 } 2129 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2130 break; 2131 2132 case IPV6_LEAVE_GROUP: 2133 /* 2134 * Drop a multicast group membership. 2135 * Group must be a valid IP6 multicast address. 2136 */ 2137 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2138 error = EINVAL; 2139 break; 2140 } 2141 mreq = mtod(m, struct ipv6_mreq *); 2142 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2143 if (suser(p->p_ucred, &p->p_acflag)) { 2144 error = EACCES; 2145 break; 2146 } 2147 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2148 error = EINVAL; 2149 break; 2150 } 2151 /* 2152 * If an interface address was specified, get a pointer 2153 * to its ifnet structure. 2154 */ 2155 if (mreq->ipv6mr_interface < 0 2156 || if_index < mreq->ipv6mr_interface) { 2157 error = ENXIO; /* XXX EINVAL? */ 2158 break; 2159 } 2160 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2161 /* 2162 * Put interface index into the multicast address, 2163 * if the address has link-local scope. 2164 */ 2165 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2166 mreq->ipv6mr_multiaddr.s6_addr16[1] 2167 = htons(mreq->ipv6mr_interface); 2168 } 2169 /* 2170 * Find the membership in the membership list. 2171 */ 2172 for (imm = im6o->im6o_memberships.lh_first; 2173 imm != NULL; imm = imm->i6mm_chain.le_next) { 2174 if ((ifp == NULL || 2175 imm->i6mm_maddr->in6m_ifp == ifp) && 2176 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2177 &mreq->ipv6mr_multiaddr)) 2178 break; 2179 } 2180 if (imm == NULL) { 2181 /* Unable to resolve interface */ 2182 error = EADDRNOTAVAIL; 2183 break; 2184 } 2185 /* 2186 * Give up the multicast address record to which the 2187 * membership points. 2188 */ 2189 LIST_REMOVE(imm, i6mm_chain); 2190 in6_delmulti(imm->i6mm_maddr); 2191 free(imm, M_IPMADDR); 2192 break; 2193 2194 default: 2195 error = EOPNOTSUPP; 2196 break; 2197 } 2198 2199 /* 2200 * If all options have default values, no need to keep the mbuf. 2201 */ 2202 if (im6o->im6o_multicast_ifp == NULL && 2203 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2204 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2205 im6o->im6o_memberships.lh_first == NULL) { 2206 free(*im6op, M_IPMOPTS); 2207 *im6op = NULL; 2208 } 2209 2210 return(error); 2211 } 2212 2213 /* 2214 * Return the IP6 multicast options in response to user getsockopt(). 2215 */ 2216 static int 2217 ip6_getmoptions(optname, im6o, mp) 2218 int optname; 2219 register struct ip6_moptions *im6o; 2220 register struct mbuf **mp; 2221 { 2222 u_int *hlim, *loop, *ifindex; 2223 2224 #ifdef __FreeBSD__ 2225 *mp = m_get(M_WAIT, MT_HEADER); /*XXX*/ 2226 #else 2227 *mp = m_get(M_WAIT, MT_SOOPTS); 2228 #endif 2229 2230 switch (optname) { 2231 2232 case IPV6_MULTICAST_IF: 2233 ifindex = mtod(*mp, u_int *); 2234 (*mp)->m_len = sizeof(u_int); 2235 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2236 *ifindex = 0; 2237 else 2238 *ifindex = im6o->im6o_multicast_ifp->if_index; 2239 return(0); 2240 2241 case IPV6_MULTICAST_HOPS: 2242 hlim = mtod(*mp, u_int *); 2243 (*mp)->m_len = sizeof(u_int); 2244 if (im6o == NULL) 2245 *hlim = ip6_defmcasthlim; 2246 else 2247 *hlim = im6o->im6o_multicast_hlim; 2248 return(0); 2249 2250 case IPV6_MULTICAST_LOOP: 2251 loop = mtod(*mp, u_int *); 2252 (*mp)->m_len = sizeof(u_int); 2253 if (im6o == NULL) 2254 *loop = ip6_defmcasthlim; 2255 else 2256 *loop = im6o->im6o_multicast_loop; 2257 return(0); 2258 2259 default: 2260 return(EOPNOTSUPP); 2261 } 2262 } 2263 2264 /* 2265 * Discard the IP6 multicast options. 2266 */ 2267 void 2268 ip6_freemoptions(im6o) 2269 register struct ip6_moptions *im6o; 2270 { 2271 struct in6_multi_mship *imm; 2272 2273 if (im6o == NULL) 2274 return; 2275 2276 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2277 LIST_REMOVE(imm, i6mm_chain); 2278 if (imm->i6mm_maddr) 2279 in6_delmulti(imm->i6mm_maddr); 2280 free(imm, M_IPMADDR); 2281 } 2282 free(im6o, M_IPMOPTS); 2283 } 2284 2285 /* 2286 * Set IPv6 outgoing packet options based on advanced API. 2287 */ 2288 int 2289 ip6_setpktoptions(control, opt, priv) 2290 struct mbuf *control; 2291 struct ip6_pktopts *opt; 2292 int priv; 2293 { 2294 register struct cmsghdr *cm = 0; 2295 2296 if (control == 0 || opt == 0) 2297 return(EINVAL); 2298 2299 bzero(opt, sizeof(*opt)); 2300 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 2301 2302 /* 2303 * XXX: Currently, we assume all the optional information is stored 2304 * in a single mbuf. 2305 */ 2306 if (control->m_next) 2307 return(EINVAL); 2308 2309 opt->ip6po_m = control; 2310 2311 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2312 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2313 cm = mtod(control, struct cmsghdr *); 2314 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2315 return(EINVAL); 2316 if (cm->cmsg_level != IPPROTO_IPV6) 2317 continue; 2318 2319 switch(cm->cmsg_type) { 2320 case IPV6_PKTINFO: 2321 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2322 return(EINVAL); 2323 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 2324 if (opt->ip6po_pktinfo->ipi6_ifindex && 2325 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2326 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2327 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2328 2329 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2330 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2331 return(ENXIO); 2332 } 2333 2334 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2335 struct ifaddr *ia; 2336 struct sockaddr_in6 sin6; 2337 2338 bzero(&sin6, sizeof(sin6)); 2339 sin6.sin6_len = sizeof(sin6); 2340 sin6.sin6_family = AF_INET6; 2341 sin6.sin6_addr = 2342 opt->ip6po_pktinfo->ipi6_addr; 2343 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2344 if (ia == NULL || 2345 (opt->ip6po_pktinfo->ipi6_ifindex && 2346 (ia->ifa_ifp->if_index != 2347 opt->ip6po_pktinfo->ipi6_ifindex))) { 2348 return(EADDRNOTAVAIL); 2349 } 2350 /* 2351 * Check if the requested source address is 2352 * indeed a unicast address assigned to the 2353 * node. 2354 */ 2355 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2356 return(EADDRNOTAVAIL); 2357 } 2358 break; 2359 2360 case IPV6_HOPLIMIT: 2361 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2362 return(EINVAL); 2363 2364 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2365 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2366 return(EINVAL); 2367 break; 2368 2369 case IPV6_NEXTHOP: 2370 if (!priv) 2371 return(EPERM); 2372 if (cm->cmsg_len < sizeof(u_char) || 2373 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2374 return(EINVAL); 2375 2376 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2377 2378 break; 2379 2380 case IPV6_HOPOPTS: 2381 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2382 return(EINVAL); 2383 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2384 if (cm->cmsg_len != 2385 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2386 return(EINVAL); 2387 break; 2388 2389 case IPV6_DSTOPTS: 2390 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2391 return(EINVAL); 2392 2393 /* 2394 * If there is no routing header yet, the destination 2395 * options header should be put on the 1st part. 2396 * Otherwise, the header should be on the 2nd part. 2397 * (See RFC 2460, section 4.1) 2398 */ 2399 if (opt->ip6po_rthdr == NULL) { 2400 opt->ip6po_dest1 = 2401 (struct ip6_dest *)CMSG_DATA(cm); 2402 if (cm->cmsg_len != 2403 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2404 << 3)) 2405 return(EINVAL); 2406 } 2407 else { 2408 opt->ip6po_dest2 = 2409 (struct ip6_dest *)CMSG_DATA(cm); 2410 if (cm->cmsg_len != 2411 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2412 << 3)) 2413 return(EINVAL); 2414 } 2415 break; 2416 2417 case IPV6_RTHDR: 2418 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2419 return(EINVAL); 2420 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2421 if (cm->cmsg_len != 2422 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2423 return(EINVAL); 2424 switch(opt->ip6po_rthdr->ip6r_type) { 2425 case IPV6_RTHDR_TYPE_0: 2426 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2427 return(EINVAL); 2428 break; 2429 default: 2430 return(EINVAL); 2431 } 2432 break; 2433 2434 default: 2435 return(ENOPROTOOPT); 2436 } 2437 } 2438 2439 return(0); 2440 } 2441 2442 /* 2443 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2444 * packet to the input queue of a specified interface. Note that this 2445 * calls the output routine of the loopback "driver", but with an interface 2446 * pointer that might NOT be &loif -- easier than replicating that code here. 2447 */ 2448 void 2449 ip6_mloopback(ifp, m, dst) 2450 struct ifnet *ifp; 2451 register struct mbuf *m; 2452 register struct sockaddr_in6 *dst; 2453 { 2454 struct mbuf *copym; 2455 2456 copym = m_copy(m, 0, M_COPYALL); 2457 if (copym != NULL) { 2458 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 2459 (void)if_simloop(ifp, copym, (struct sockaddr *)dst, NULL); 2460 #else 2461 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2462 #endif 2463 } 2464 } 2465 2466 /* 2467 * Chop IPv6 header off from the payload. 2468 */ 2469 static int 2470 ip6_splithdr(m, exthdrs) 2471 struct mbuf *m; 2472 struct ip6_exthdrs *exthdrs; 2473 { 2474 struct mbuf *mh; 2475 struct ip6_hdr *ip6; 2476 2477 ip6 = mtod(m, struct ip6_hdr *); 2478 if (m->m_len > sizeof(*ip6)) { 2479 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2480 if (mh == 0) { 2481 m_freem(m); 2482 return ENOBUFS; 2483 } 2484 M_COPY_PKTHDR(mh, m); 2485 MH_ALIGN(mh, sizeof(*ip6)); 2486 m->m_flags &= ~M_PKTHDR; 2487 m->m_len -= sizeof(*ip6); 2488 m->m_data += sizeof(*ip6); 2489 mh->m_next = m; 2490 m = mh; 2491 m->m_len = sizeof(*ip6); 2492 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2493 } 2494 exthdrs->ip6e_ip6 = m; 2495 return 0; 2496 } 2497 2498 /* 2499 * Compute IPv6 extension header length. 2500 */ 2501 #ifdef HAVE_NRL_INPCB 2502 # define in6pcb inpcb 2503 # define in6p_outputopts inp_outputopts6 2504 #endif 2505 int 2506 ip6_optlen(in6p) 2507 struct in6pcb *in6p; 2508 { 2509 int len; 2510 2511 if (!in6p->in6p_outputopts) 2512 return 0; 2513 2514 len = 0; 2515 #define elen(x) \ 2516 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2517 2518 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2519 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2520 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2521 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2522 return len; 2523 #undef elen 2524 } 2525 #ifdef HAVE_NRL_INPCB 2526 # undef in6pcb 2527 # undef in6p_outputopts 2528 #endif 2529
Indexes created Wed Oct 01 07:09:59 GMT 2025