ip6_output.c revision 1.31.2.6
1 /* $NetBSD: ip6_output.c,v 1.31.2.6 2001/11/14 19:18:10 nathanw Exp $ */ 2 /* $KAME: ip6_output.c,v 1.172 2001/03/25 09:55:56 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. 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 <sys/cdefs.h> 69 __KERNEL_RCSID(0, "$NetBSD: ip6_output.c,v 1.31.2.6 2001/11/14 19:18:10 nathanw Exp $"); 70 71 #include "opt_inet.h" 72 #include "opt_ipsec.h" 73 #include "opt_pfil_hooks.h" 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 #include <sys/lwp.h> 84 #include <sys/proc.h> 85 86 #include <net/if.h> 87 #include <net/route.h> 88 #ifdef PFIL_HOOKS 89 #include <net/pfil.h> 90 #endif 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/ip6.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/in6_pcb.h> 98 #include <netinet6/nd6.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netkey/key.h> 103 #endif /* IPSEC */ 104 105 #include "loop.h" 106 107 #include <net/net_osdep.h> 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 || mtu == 0) { 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 * if MTU on the route is 0, we need to fix the MTU. 747 * this case happens with path MTU discovery timeouts. 748 */ 749 mtu = ifmtu; 750 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 751 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 752 } 753 } else { 754 mtu = nd_ifinfo[ifp->if_index].linkmtu; 755 } 756 757 /* Fake scoped addresses */ 758 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 759 /* 760 * If source or destination address is a scoped address, and 761 * the packet is going to be sent to a loopback interface, 762 * we should keep the original interface. 763 */ 764 765 /* 766 * XXX: this is a very experimental and temporary solution. 767 * We eventually have sockaddr_in6 and use the sin6_scope_id 768 * field of the structure here. 769 * We rely on the consistency between two scope zone ids 770 * of source add destination, which should already be assured 771 * Larger scopes than link will be supported in the near 772 * future. 773 */ 774 origifp = NULL; 775 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 776 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 777 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 778 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 779 /* 780 * XXX: origifp can be NULL even in those two cases above. 781 * For example, if we remove the (only) link-local address 782 * from the loopback interface, and try to send a link-local 783 * address without link-id information. Then the source 784 * address is ::1, and the destination address is the 785 * link-local address with its s6_addr16[1] being zero. 786 * What is worse, if the packet goes to the loopback interface 787 * by a default rejected route, the null pointer would be 788 * passed to looutput, and the kernel would hang. 789 * The following last resort would prevent such disaster. 790 */ 791 if (origifp == NULL) 792 origifp = ifp; 793 } 794 else 795 origifp = ifp; 796 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 797 ip6->ip6_src.s6_addr16[1] = 0; 798 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 799 ip6->ip6_dst.s6_addr16[1] = 0; 800 801 /* 802 * If the outgoing packet contains a hop-by-hop options header, 803 * it must be examined and processed even by the source node. 804 * (RFC 2460, section 4.) 805 */ 806 if (exthdrs.ip6e_hbh) { 807 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 808 u_int32_t dummy1; /* XXX unused */ 809 u_int32_t dummy2; /* XXX unused */ 810 811 /* 812 * XXX: if we have to send an ICMPv6 error to the sender, 813 * we need the M_LOOP flag since icmp6_error() expects 814 * the IPv6 and the hop-by-hop options header are 815 * continuous unless the flag is set. 816 */ 817 m->m_flags |= M_LOOP; 818 m->m_pkthdr.rcvif = ifp; 819 if (ip6_process_hopopts(m, 820 (u_int8_t *)(hbh + 1), 821 ((hbh->ip6h_len + 1) << 3) - 822 sizeof(struct ip6_hbh), 823 &dummy1, &dummy2) < 0) { 824 /* m was already freed at this point */ 825 error = EINVAL;/* better error? */ 826 goto done; 827 } 828 m->m_flags &= ~M_LOOP; /* XXX */ 829 m->m_pkthdr.rcvif = NULL; 830 } 831 832 #ifdef PFIL_HOOKS 833 /* 834 * Run through list of hooks for output packets. 835 */ 836 if ((error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, 837 PFIL_OUT)) != 0) 838 goto done; 839 if (m == NULL) 840 goto done; 841 ip6 = mtod(m, struct ip6_hdr *); 842 #endif /* PFIL_HOOKS */ 843 /* 844 * Send the packet to the outgoing interface. 845 * If necessary, do IPv6 fragmentation before sending. 846 */ 847 tlen = m->m_pkthdr.len; 848 if (tlen <= mtu 849 #ifdef notyet 850 /* 851 * On any link that cannot convey a 1280-octet packet in one piece, 852 * link-specific fragmentation and reassembly must be provided at 853 * a layer below IPv6. [RFC 2460, sec.5] 854 * Thus if the interface has ability of link-level fragmentation, 855 * we can just send the packet even if the packet size is 856 * larger than the link's MTU. 857 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 858 */ 859 860 || ifp->if_flags & IFF_FRAGMENTABLE 861 #endif 862 ) 863 { 864 #ifdef IFA_STATS 865 struct in6_ifaddr *ia6; 866 ip6 = mtod(m, struct ip6_hdr *); 867 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 868 if (ia6) { 869 ia6->ia_ifa.ifa_data.ifad_outbytes += 870 m->m_pkthdr.len; 871 } 872 #endif 873 #ifdef IPSEC 874 /* clean ipsec history once it goes out of the node */ 875 ipsec_delaux(m); 876 #endif 877 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 878 goto done; 879 } else if (mtu < IPV6_MMTU) { 880 /* 881 * note that path MTU is never less than IPV6_MMTU 882 * (see icmp6_input). 883 */ 884 error = EMSGSIZE; 885 in6_ifstat_inc(ifp, ifs6_out_fragfail); 886 goto bad; 887 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 888 error = EMSGSIZE; 889 in6_ifstat_inc(ifp, ifs6_out_fragfail); 890 goto bad; 891 } else { 892 struct mbuf **mnext, *m_frgpart; 893 struct ip6_frag *ip6f; 894 u_int32_t id = htonl(ip6_id++); 895 u_char nextproto; 896 897 /* 898 * Too large for the destination or interface; 899 * fragment if possible. 900 * Must be able to put at least 8 bytes per fragment. 901 */ 902 hlen = unfragpartlen; 903 if (mtu > IPV6_MAXPACKET) 904 mtu = IPV6_MAXPACKET; 905 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 906 if (len < 8) { 907 error = EMSGSIZE; 908 in6_ifstat_inc(ifp, ifs6_out_fragfail); 909 goto bad; 910 } 911 912 mnext = &m->m_nextpkt; 913 914 /* 915 * Change the next header field of the last header in the 916 * unfragmentable part. 917 */ 918 if (exthdrs.ip6e_rthdr) { 919 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 920 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 921 } else if (exthdrs.ip6e_dest1) { 922 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 923 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 924 } else if (exthdrs.ip6e_hbh) { 925 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 926 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 927 } else { 928 nextproto = ip6->ip6_nxt; 929 ip6->ip6_nxt = IPPROTO_FRAGMENT; 930 } 931 932 /* 933 * Loop through length of segment after first fragment, 934 * make new header and copy data of each part and link onto chain. 935 */ 936 m0 = m; 937 for (off = hlen; off < tlen; off += len) { 938 MGETHDR(m, M_DONTWAIT, MT_HEADER); 939 if (!m) { 940 error = ENOBUFS; 941 ip6stat.ip6s_odropped++; 942 goto sendorfree; 943 } 944 m->m_flags = m0->m_flags & M_COPYFLAGS; 945 *mnext = m; 946 mnext = &m->m_nextpkt; 947 m->m_data += max_linkhdr; 948 mhip6 = mtod(m, struct ip6_hdr *); 949 *mhip6 = *ip6; 950 m->m_len = sizeof(*mhip6); 951 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 952 if (error) { 953 ip6stat.ip6s_odropped++; 954 goto sendorfree; 955 } 956 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 957 if (off + len >= tlen) 958 len = tlen - off; 959 else 960 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 961 mhip6->ip6_plen = htons((u_short)(len + hlen + 962 sizeof(*ip6f) - 963 sizeof(struct ip6_hdr))); 964 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 965 error = ENOBUFS; 966 ip6stat.ip6s_odropped++; 967 goto sendorfree; 968 } 969 m_cat(m, m_frgpart); 970 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 971 m->m_pkthdr.rcvif = (struct ifnet *)0; 972 ip6f->ip6f_reserved = 0; 973 ip6f->ip6f_ident = id; 974 ip6f->ip6f_nxt = nextproto; 975 ip6stat.ip6s_ofragments++; 976 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 977 } 978 979 in6_ifstat_inc(ifp, ifs6_out_fragok); 980 } 981 982 /* 983 * Remove leading garbages. 984 */ 985 sendorfree: 986 m = m0->m_nextpkt; 987 m0->m_nextpkt = 0; 988 m_freem(m0); 989 for (m0 = m; m; m = m0) { 990 m0 = m->m_nextpkt; 991 m->m_nextpkt = 0; 992 if (error == 0) { 993 #ifdef IFA_STATS 994 struct in6_ifaddr *ia6; 995 ip6 = mtod(m, struct ip6_hdr *); 996 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 997 if (ia6) { 998 ia6->ia_ifa.ifa_data.ifad_outbytes += 999 m->m_pkthdr.len; 1000 } 1001 #endif 1002 #ifdef IPSEC 1003 /* clean ipsec history once it goes out of the node */ 1004 ipsec_delaux(m); 1005 #endif 1006 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1007 } else 1008 m_freem(m); 1009 } 1010 1011 if (error == 0) 1012 ip6stat.ip6s_fragmented++; 1013 1014 done: 1015 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1016 RTFREE(ro->ro_rt); 1017 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1018 RTFREE(ro_pmtu->ro_rt); 1019 } 1020 1021 #ifdef IPSEC 1022 if (sp != NULL) 1023 key_freesp(sp); 1024 #endif /* IPSEC */ 1025 1026 return(error); 1027 1028 freehdrs: 1029 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1030 m_freem(exthdrs.ip6e_dest1); 1031 m_freem(exthdrs.ip6e_rthdr); 1032 m_freem(exthdrs.ip6e_dest2); 1033 /* fall through */ 1034 bad: 1035 m_freem(m); 1036 goto done; 1037 } 1038 1039 static int 1040 ip6_copyexthdr(mp, hdr, hlen) 1041 struct mbuf **mp; 1042 caddr_t hdr; 1043 int hlen; 1044 { 1045 struct mbuf *m; 1046 1047 if (hlen > MCLBYTES) 1048 return(ENOBUFS); /* XXX */ 1049 1050 MGET(m, M_DONTWAIT, MT_DATA); 1051 if (!m) 1052 return(ENOBUFS); 1053 1054 if (hlen > MLEN) { 1055 MCLGET(m, M_DONTWAIT); 1056 if ((m->m_flags & M_EXT) == 0) { 1057 m_free(m); 1058 return(ENOBUFS); 1059 } 1060 } 1061 m->m_len = hlen; 1062 if (hdr) 1063 bcopy(hdr, mtod(m, caddr_t), hlen); 1064 1065 *mp = m; 1066 return(0); 1067 } 1068 1069 /* 1070 * Insert jumbo payload option. 1071 */ 1072 static int 1073 ip6_insert_jumboopt(exthdrs, plen) 1074 struct ip6_exthdrs *exthdrs; 1075 u_int32_t plen; 1076 { 1077 struct mbuf *mopt; 1078 u_char *optbuf; 1079 u_int32_t v; 1080 1081 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1082 1083 /* 1084 * If there is no hop-by-hop options header, allocate new one. 1085 * If there is one but it doesn't have enough space to store the 1086 * jumbo payload option, allocate a cluster to store the whole options. 1087 * Otherwise, use it to store the options. 1088 */ 1089 if (exthdrs->ip6e_hbh == 0) { 1090 MGET(mopt, M_DONTWAIT, MT_DATA); 1091 if (mopt == 0) 1092 return(ENOBUFS); 1093 mopt->m_len = JUMBOOPTLEN; 1094 optbuf = mtod(mopt, u_char *); 1095 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1096 exthdrs->ip6e_hbh = mopt; 1097 } else { 1098 struct ip6_hbh *hbh; 1099 1100 mopt = exthdrs->ip6e_hbh; 1101 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1102 /* 1103 * XXX assumption: 1104 * - exthdrs->ip6e_hbh is not referenced from places 1105 * other than exthdrs. 1106 * - exthdrs->ip6e_hbh is not an mbuf chain. 1107 */ 1108 int oldoptlen = mopt->m_len; 1109 struct mbuf *n; 1110 1111 /* 1112 * XXX: give up if the whole (new) hbh header does 1113 * not fit even in an mbuf cluster. 1114 */ 1115 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1116 return(ENOBUFS); 1117 1118 /* 1119 * As a consequence, we must always prepare a cluster 1120 * at this point. 1121 */ 1122 MGET(n, M_DONTWAIT, MT_DATA); 1123 if (n) { 1124 MCLGET(n, M_DONTWAIT); 1125 if ((n->m_flags & M_EXT) == 0) { 1126 m_freem(n); 1127 n = NULL; 1128 } 1129 } 1130 if (!n) 1131 return(ENOBUFS); 1132 n->m_len = oldoptlen + JUMBOOPTLEN; 1133 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1134 oldoptlen); 1135 optbuf = mtod(n, caddr_t) + oldoptlen; 1136 m_freem(mopt); 1137 mopt = exthdrs->ip6e_hbh = n; 1138 } else { 1139 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1140 mopt->m_len += JUMBOOPTLEN; 1141 } 1142 optbuf[0] = IP6OPT_PADN; 1143 optbuf[1] = 1; 1144 1145 /* 1146 * Adjust the header length according to the pad and 1147 * the jumbo payload option. 1148 */ 1149 hbh = mtod(mopt, struct ip6_hbh *); 1150 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1151 } 1152 1153 /* fill in the option. */ 1154 optbuf[2] = IP6OPT_JUMBO; 1155 optbuf[3] = 4; 1156 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1157 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1158 1159 /* finally, adjust the packet header length */ 1160 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1161 1162 return(0); 1163 #undef JUMBOOPTLEN 1164 } 1165 1166 /* 1167 * Insert fragment header and copy unfragmentable header portions. 1168 */ 1169 static int 1170 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1171 struct mbuf *m0, *m; 1172 int hlen; 1173 struct ip6_frag **frghdrp; 1174 { 1175 struct mbuf *n, *mlast; 1176 1177 if (hlen > sizeof(struct ip6_hdr)) { 1178 n = m_copym(m0, sizeof(struct ip6_hdr), 1179 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1180 if (n == 0) 1181 return(ENOBUFS); 1182 m->m_next = n; 1183 } else 1184 n = m; 1185 1186 /* Search for the last mbuf of unfragmentable part. */ 1187 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1188 ; 1189 1190 if ((mlast->m_flags & M_EXT) == 0 && 1191 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1192 /* use the trailing space of the last mbuf for the fragment hdr */ 1193 *frghdrp = 1194 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1195 mlast->m_len += sizeof(struct ip6_frag); 1196 m->m_pkthdr.len += sizeof(struct ip6_frag); 1197 } else { 1198 /* allocate a new mbuf for the fragment header */ 1199 struct mbuf *mfrg; 1200 1201 MGET(mfrg, M_DONTWAIT, MT_DATA); 1202 if (mfrg == 0) 1203 return(ENOBUFS); 1204 mfrg->m_len = sizeof(struct ip6_frag); 1205 *frghdrp = mtod(mfrg, struct ip6_frag *); 1206 mlast->m_next = mfrg; 1207 } 1208 1209 return(0); 1210 } 1211 1212 /* 1213 * IP6 socket option processing. 1214 */ 1215 int 1216 ip6_ctloutput(op, so, level, optname, mp) 1217 int op; 1218 struct socket *so; 1219 int level, optname; 1220 struct mbuf **mp; 1221 { 1222 struct in6pcb *in6p = sotoin6pcb(so); 1223 struct mbuf *m = *mp; 1224 int optval = 0; 1225 int error = 0; 1226 struct proc *p = (curproc ? curproc->l_proc : 0); /* XXX */ 1227 1228 if (level == IPPROTO_IPV6) { 1229 switch (op) { 1230 1231 case PRCO_SETOPT: 1232 switch (optname) { 1233 case IPV6_PKTOPTIONS: 1234 /* m is freed in ip6_pcbopts */ 1235 return(ip6_pcbopts(&in6p->in6p_outputopts, 1236 m, so)); 1237 case IPV6_HOPOPTS: 1238 case IPV6_DSTOPTS: 1239 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1240 error = EPERM; 1241 break; 1242 } 1243 /* fall through */ 1244 case IPV6_UNICAST_HOPS: 1245 case IPV6_RECVOPTS: 1246 case IPV6_RECVRETOPTS: 1247 case IPV6_RECVDSTADDR: 1248 case IPV6_PKTINFO: 1249 case IPV6_HOPLIMIT: 1250 case IPV6_RTHDR: 1251 case IPV6_FAITH: 1252 case IPV6_V6ONLY: 1253 if (!m || m->m_len != sizeof(int)) { 1254 error = EINVAL; 1255 break; 1256 } 1257 optval = *mtod(m, int *); 1258 switch (optname) { 1259 1260 case IPV6_UNICAST_HOPS: 1261 if (optval < -1 || optval >= 256) 1262 error = EINVAL; 1263 else { 1264 /* -1 = kernel default */ 1265 in6p->in6p_hops = optval; 1266 } 1267 break; 1268 #define OPTSET(bit) \ 1269 if (optval) \ 1270 in6p->in6p_flags |= bit; \ 1271 else \ 1272 in6p->in6p_flags &= ~bit; 1273 1274 case IPV6_RECVOPTS: 1275 OPTSET(IN6P_RECVOPTS); 1276 break; 1277 1278 case IPV6_RECVRETOPTS: 1279 OPTSET(IN6P_RECVRETOPTS); 1280 break; 1281 1282 case IPV6_RECVDSTADDR: 1283 OPTSET(IN6P_RECVDSTADDR); 1284 break; 1285 1286 case IPV6_PKTINFO: 1287 OPTSET(IN6P_PKTINFO); 1288 break; 1289 1290 case IPV6_HOPLIMIT: 1291 OPTSET(IN6P_HOPLIMIT); 1292 break; 1293 1294 case IPV6_HOPOPTS: 1295 OPTSET(IN6P_HOPOPTS); 1296 break; 1297 1298 case IPV6_DSTOPTS: 1299 OPTSET(IN6P_DSTOPTS); 1300 break; 1301 1302 case IPV6_RTHDR: 1303 OPTSET(IN6P_RTHDR); 1304 break; 1305 1306 case IPV6_FAITH: 1307 OPTSET(IN6P_FAITH); 1308 break; 1309 1310 case IPV6_V6ONLY: 1311 /* 1312 * make setsockopt(IPV6_V6ONLY) 1313 * available only prior to bind(2). 1314 * see ipng mailing list, Jun 22 2001. 1315 */ 1316 if (in6p->in6p_lport || 1317 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1318 { 1319 error = EINVAL; 1320 break; 1321 } 1322 #ifdef INET6_BINDV6ONLY 1323 if (!optval) 1324 error = EINVAL; 1325 #else 1326 OPTSET(IN6P_IPV6_V6ONLY); 1327 #endif 1328 break; 1329 } 1330 break; 1331 #undef OPTSET 1332 1333 case IPV6_MULTICAST_IF: 1334 case IPV6_MULTICAST_HOPS: 1335 case IPV6_MULTICAST_LOOP: 1336 case IPV6_JOIN_GROUP: 1337 case IPV6_LEAVE_GROUP: 1338 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1339 break; 1340 1341 case IPV6_PORTRANGE: 1342 optval = *mtod(m, int *); 1343 1344 switch (optval) { 1345 case IPV6_PORTRANGE_DEFAULT: 1346 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1347 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1348 break; 1349 1350 case IPV6_PORTRANGE_HIGH: 1351 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1352 in6p->in6p_flags |= IN6P_HIGHPORT; 1353 break; 1354 1355 case IPV6_PORTRANGE_LOW: 1356 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1357 in6p->in6p_flags |= IN6P_LOWPORT; 1358 break; 1359 1360 default: 1361 error = EINVAL; 1362 break; 1363 } 1364 break; 1365 1366 #ifdef IPSEC 1367 case IPV6_IPSEC_POLICY: 1368 { 1369 caddr_t req = NULL; 1370 size_t len = 0; 1371 1372 int priv = 0; 1373 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1374 priv = 0; 1375 else 1376 priv = 1; 1377 if (m) { 1378 req = mtod(m, caddr_t); 1379 len = m->m_len; 1380 } 1381 error = ipsec6_set_policy(in6p, 1382 optname, req, len, priv); 1383 } 1384 break; 1385 #endif /* IPSEC */ 1386 1387 default: 1388 error = ENOPROTOOPT; 1389 break; 1390 } 1391 if (m) 1392 (void)m_free(m); 1393 break; 1394 1395 case PRCO_GETOPT: 1396 switch (optname) { 1397 1398 case IPV6_OPTIONS: 1399 case IPV6_RETOPTS: 1400 #if 0 1401 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1402 if (in6p->in6p_options) { 1403 m->m_len = in6p->in6p_options->m_len; 1404 bcopy(mtod(in6p->in6p_options, caddr_t), 1405 mtod(m, caddr_t), 1406 (unsigned)m->m_len); 1407 } else 1408 m->m_len = 0; 1409 break; 1410 #else 1411 error = ENOPROTOOPT; 1412 break; 1413 #endif 1414 1415 case IPV6_PKTOPTIONS: 1416 if (in6p->in6p_options) { 1417 *mp = m_copym(in6p->in6p_options, 0, 1418 M_COPYALL, M_WAIT); 1419 } else { 1420 *mp = m_get(M_WAIT, MT_SOOPTS); 1421 (*mp)->m_len = 0; 1422 } 1423 break; 1424 1425 case IPV6_HOPOPTS: 1426 case IPV6_DSTOPTS: 1427 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1428 error = EPERM; 1429 break; 1430 } 1431 /* fall through */ 1432 case IPV6_UNICAST_HOPS: 1433 case IPV6_RECVOPTS: 1434 case IPV6_RECVRETOPTS: 1435 case IPV6_RECVDSTADDR: 1436 case IPV6_PORTRANGE: 1437 case IPV6_PKTINFO: 1438 case IPV6_HOPLIMIT: 1439 case IPV6_RTHDR: 1440 case IPV6_FAITH: 1441 case IPV6_V6ONLY: 1442 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1443 m->m_len = sizeof(int); 1444 switch (optname) { 1445 1446 case IPV6_UNICAST_HOPS: 1447 optval = in6p->in6p_hops; 1448 break; 1449 1450 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1451 1452 case IPV6_RECVOPTS: 1453 optval = OPTBIT(IN6P_RECVOPTS); 1454 break; 1455 1456 case IPV6_RECVRETOPTS: 1457 optval = OPTBIT(IN6P_RECVRETOPTS); 1458 break; 1459 1460 case IPV6_RECVDSTADDR: 1461 optval = OPTBIT(IN6P_RECVDSTADDR); 1462 break; 1463 1464 case IPV6_PORTRANGE: 1465 { 1466 int flags; 1467 flags = in6p->in6p_flags; 1468 if (flags & IN6P_HIGHPORT) 1469 optval = IPV6_PORTRANGE_HIGH; 1470 else if (flags & IN6P_LOWPORT) 1471 optval = IPV6_PORTRANGE_LOW; 1472 else 1473 optval = 0; 1474 break; 1475 } 1476 1477 case IPV6_PKTINFO: 1478 optval = OPTBIT(IN6P_PKTINFO); 1479 break; 1480 1481 case IPV6_HOPLIMIT: 1482 optval = OPTBIT(IN6P_HOPLIMIT); 1483 break; 1484 1485 case IPV6_HOPOPTS: 1486 optval = OPTBIT(IN6P_HOPOPTS); 1487 break; 1488 1489 case IPV6_DSTOPTS: 1490 optval = OPTBIT(IN6P_DSTOPTS); 1491 break; 1492 1493 case IPV6_RTHDR: 1494 optval = OPTBIT(IN6P_RTHDR); 1495 break; 1496 1497 case IPV6_FAITH: 1498 optval = OPTBIT(IN6P_FAITH); 1499 break; 1500 1501 case IPV6_V6ONLY: 1502 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1503 break; 1504 } 1505 *mtod(m, int *) = optval; 1506 break; 1507 1508 case IPV6_MULTICAST_IF: 1509 case IPV6_MULTICAST_HOPS: 1510 case IPV6_MULTICAST_LOOP: 1511 case IPV6_JOIN_GROUP: 1512 case IPV6_LEAVE_GROUP: 1513 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1514 break; 1515 1516 #ifdef IPSEC 1517 case IPV6_IPSEC_POLICY: 1518 { 1519 caddr_t req = NULL; 1520 size_t len = 0; 1521 1522 if (m) { 1523 req = mtod(m, caddr_t); 1524 len = m->m_len; 1525 } 1526 error = ipsec6_get_policy(in6p, req, len, mp); 1527 break; 1528 } 1529 #endif /* IPSEC */ 1530 1531 default: 1532 error = ENOPROTOOPT; 1533 break; 1534 } 1535 break; 1536 } 1537 } else { 1538 error = EINVAL; 1539 if (op == PRCO_SETOPT && *mp) 1540 (void)m_free(*mp); 1541 } 1542 return(error); 1543 } 1544 1545 /* 1546 * Set up IP6 options in pcb for insertion in output packets. 1547 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1548 * with destination address if source routed. 1549 */ 1550 static int 1551 ip6_pcbopts(pktopt, m, so) 1552 struct ip6_pktopts **pktopt; 1553 struct mbuf *m; 1554 struct socket *so; 1555 { 1556 struct ip6_pktopts *opt = *pktopt; 1557 int error = 0; 1558 struct proc *p = (curproc ? curproc->l_proc : 0); /* XXX */ 1559 int priv = 0; 1560 1561 /* turn off any old options. */ 1562 if (opt) { 1563 if (opt->ip6po_m) 1564 (void)m_free(opt->ip6po_m); 1565 } else 1566 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1567 *pktopt = 0; 1568 1569 if (!m || m->m_len == 0) { 1570 /* 1571 * Only turning off any previous options. 1572 */ 1573 if (opt) 1574 free(opt, M_IP6OPT); 1575 if (m) 1576 (void)m_free(m); 1577 return(0); 1578 } 1579 1580 /* set options specified by user. */ 1581 if (p && !suser(p->p_ucred, &p->p_acflag)) 1582 priv = 1; 1583 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1584 (void)m_free(m); 1585 return(error); 1586 } 1587 *pktopt = opt; 1588 return(0); 1589 } 1590 1591 /* 1592 * Set the IP6 multicast options in response to user setsockopt(). 1593 */ 1594 static int 1595 ip6_setmoptions(optname, im6op, m) 1596 int optname; 1597 struct ip6_moptions **im6op; 1598 struct mbuf *m; 1599 { 1600 int error = 0; 1601 u_int loop, ifindex; 1602 struct ipv6_mreq *mreq; 1603 struct ifnet *ifp; 1604 struct ip6_moptions *im6o = *im6op; 1605 struct route_in6 ro; 1606 struct sockaddr_in6 *dst; 1607 struct in6_multi_mship *imm; 1608 struct proc *p = curproc->l_proc; /* XXX */ 1609 1610 if (im6o == NULL) { 1611 /* 1612 * No multicast option buffer attached to the pcb; 1613 * allocate one and initialize to default values. 1614 */ 1615 im6o = (struct ip6_moptions *) 1616 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1617 1618 if (im6o == NULL) 1619 return(ENOBUFS); 1620 *im6op = im6o; 1621 im6o->im6o_multicast_ifp = NULL; 1622 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1623 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1624 LIST_INIT(&im6o->im6o_memberships); 1625 } 1626 1627 switch (optname) { 1628 1629 case IPV6_MULTICAST_IF: 1630 /* 1631 * Select the interface for outgoing multicast packets. 1632 */ 1633 if (m == NULL || m->m_len != sizeof(u_int)) { 1634 error = EINVAL; 1635 break; 1636 } 1637 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 1638 if (ifindex < 0 || if_index < ifindex) { 1639 error = ENXIO; /* XXX EINVAL? */ 1640 break; 1641 } 1642 ifp = ifindex2ifnet[ifindex]; 1643 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1644 error = EADDRNOTAVAIL; 1645 break; 1646 } 1647 im6o->im6o_multicast_ifp = ifp; 1648 break; 1649 1650 case IPV6_MULTICAST_HOPS: 1651 { 1652 /* 1653 * Set the IP6 hoplimit for outgoing multicast packets. 1654 */ 1655 int optval; 1656 if (m == NULL || m->m_len != sizeof(int)) { 1657 error = EINVAL; 1658 break; 1659 } 1660 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 1661 if (optval < -1 || optval >= 256) 1662 error = EINVAL; 1663 else if (optval == -1) 1664 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1665 else 1666 im6o->im6o_multicast_hlim = optval; 1667 break; 1668 } 1669 1670 case IPV6_MULTICAST_LOOP: 1671 /* 1672 * Set the loopback flag for outgoing multicast packets. 1673 * Must be zero or one. 1674 */ 1675 if (m == NULL || m->m_len != sizeof(u_int)) { 1676 error = EINVAL; 1677 break; 1678 } 1679 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 1680 if (loop > 1) { 1681 error = EINVAL; 1682 break; 1683 } 1684 im6o->im6o_multicast_loop = loop; 1685 break; 1686 1687 case IPV6_JOIN_GROUP: 1688 /* 1689 * Add a multicast group membership. 1690 * Group must be a valid IP6 multicast address. 1691 */ 1692 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1693 error = EINVAL; 1694 break; 1695 } 1696 mreq = mtod(m, struct ipv6_mreq *); 1697 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1698 /* 1699 * We use the unspecified address to specify to accept 1700 * all multicast addresses. Only super user is allowed 1701 * to do this. 1702 */ 1703 if (suser(p->p_ucred, &p->p_acflag)) 1704 { 1705 error = EACCES; 1706 break; 1707 } 1708 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1709 error = EINVAL; 1710 break; 1711 } 1712 1713 /* 1714 * If the interface is specified, validate it. 1715 */ 1716 if (mreq->ipv6mr_interface < 0 1717 || if_index < mreq->ipv6mr_interface) { 1718 error = ENXIO; /* XXX EINVAL? */ 1719 break; 1720 } 1721 /* 1722 * If no interface was explicitly specified, choose an 1723 * appropriate one according to the given multicast address. 1724 */ 1725 if (mreq->ipv6mr_interface == 0) { 1726 /* 1727 * If the multicast address is in node-local scope, 1728 * the interface should be a loopback interface. 1729 * Otherwise, look up the routing table for the 1730 * address, and choose the outgoing interface. 1731 * XXX: is it a good approach? 1732 */ 1733 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1734 ifp = &loif[0]; 1735 } else { 1736 ro.ro_rt = NULL; 1737 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1738 bzero(dst, sizeof(*dst)); 1739 dst->sin6_len = sizeof(struct sockaddr_in6); 1740 dst->sin6_family = AF_INET6; 1741 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1742 rtalloc((struct route *)&ro); 1743 if (ro.ro_rt == NULL) { 1744 error = EADDRNOTAVAIL; 1745 break; 1746 } 1747 ifp = ro.ro_rt->rt_ifp; 1748 rtfree(ro.ro_rt); 1749 } 1750 } else 1751 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1752 1753 /* 1754 * See if we found an interface, and confirm that it 1755 * supports multicast 1756 */ 1757 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1758 error = EADDRNOTAVAIL; 1759 break; 1760 } 1761 /* 1762 * Put interface index into the multicast address, 1763 * if the address has link-local scope. 1764 */ 1765 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1766 mreq->ipv6mr_multiaddr.s6_addr16[1] 1767 = htons(mreq->ipv6mr_interface); 1768 } 1769 /* 1770 * See if the membership already exists. 1771 */ 1772 for (imm = im6o->im6o_memberships.lh_first; 1773 imm != NULL; imm = imm->i6mm_chain.le_next) 1774 if (imm->i6mm_maddr->in6m_ifp == ifp && 1775 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1776 &mreq->ipv6mr_multiaddr)) 1777 break; 1778 if (imm != NULL) { 1779 error = EADDRINUSE; 1780 break; 1781 } 1782 /* 1783 * Everything looks good; add a new record to the multicast 1784 * address list for the given interface. 1785 */ 1786 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1787 if (imm == NULL) { 1788 error = ENOBUFS; 1789 break; 1790 } 1791 if ((imm->i6mm_maddr = 1792 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1793 free(imm, M_IPMADDR); 1794 break; 1795 } 1796 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1797 break; 1798 1799 case IPV6_LEAVE_GROUP: 1800 /* 1801 * Drop a multicast group membership. 1802 * Group must be a valid IP6 multicast address. 1803 */ 1804 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1805 error = EINVAL; 1806 break; 1807 } 1808 mreq = mtod(m, struct ipv6_mreq *); 1809 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 1810 if (suser(p->p_ucred, &p->p_acflag)) 1811 { 1812 error = EACCES; 1813 break; 1814 } 1815 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1816 error = EINVAL; 1817 break; 1818 } 1819 /* 1820 * If an interface address was specified, get a pointer 1821 * to its ifnet structure. 1822 */ 1823 if (mreq->ipv6mr_interface < 0 1824 || if_index < mreq->ipv6mr_interface) { 1825 error = ENXIO; /* XXX EINVAL? */ 1826 break; 1827 } 1828 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1829 /* 1830 * Put interface index into the multicast address, 1831 * if the address has link-local scope. 1832 */ 1833 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1834 mreq->ipv6mr_multiaddr.s6_addr16[1] 1835 = htons(mreq->ipv6mr_interface); 1836 } 1837 /* 1838 * Find the membership in the membership list. 1839 */ 1840 for (imm = im6o->im6o_memberships.lh_first; 1841 imm != NULL; imm = imm->i6mm_chain.le_next) { 1842 if ((ifp == NULL || 1843 imm->i6mm_maddr->in6m_ifp == ifp) && 1844 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1845 &mreq->ipv6mr_multiaddr)) 1846 break; 1847 } 1848 if (imm == NULL) { 1849 /* Unable to resolve interface */ 1850 error = EADDRNOTAVAIL; 1851 break; 1852 } 1853 /* 1854 * Give up the multicast address record to which the 1855 * membership points. 1856 */ 1857 LIST_REMOVE(imm, i6mm_chain); 1858 in6_delmulti(imm->i6mm_maddr); 1859 free(imm, M_IPMADDR); 1860 break; 1861 1862 default: 1863 error = EOPNOTSUPP; 1864 break; 1865 } 1866 1867 /* 1868 * If all options have default values, no need to keep the mbuf. 1869 */ 1870 if (im6o->im6o_multicast_ifp == NULL && 1871 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1872 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1873 im6o->im6o_memberships.lh_first == NULL) { 1874 free(*im6op, M_IPMOPTS); 1875 *im6op = NULL; 1876 } 1877 1878 return(error); 1879 } 1880 1881 /* 1882 * Return the IP6 multicast options in response to user getsockopt(). 1883 */ 1884 static int 1885 ip6_getmoptions(optname, im6o, mp) 1886 int optname; 1887 struct ip6_moptions *im6o; 1888 struct mbuf **mp; 1889 { 1890 u_int *hlim, *loop, *ifindex; 1891 1892 *mp = m_get(M_WAIT, MT_SOOPTS); 1893 1894 switch (optname) { 1895 1896 case IPV6_MULTICAST_IF: 1897 ifindex = mtod(*mp, u_int *); 1898 (*mp)->m_len = sizeof(u_int); 1899 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1900 *ifindex = 0; 1901 else 1902 *ifindex = im6o->im6o_multicast_ifp->if_index; 1903 return(0); 1904 1905 case IPV6_MULTICAST_HOPS: 1906 hlim = mtod(*mp, u_int *); 1907 (*mp)->m_len = sizeof(u_int); 1908 if (im6o == NULL) 1909 *hlim = ip6_defmcasthlim; 1910 else 1911 *hlim = im6o->im6o_multicast_hlim; 1912 return(0); 1913 1914 case IPV6_MULTICAST_LOOP: 1915 loop = mtod(*mp, u_int *); 1916 (*mp)->m_len = sizeof(u_int); 1917 if (im6o == NULL) 1918 *loop = ip6_defmcasthlim; 1919 else 1920 *loop = im6o->im6o_multicast_loop; 1921 return(0); 1922 1923 default: 1924 return(EOPNOTSUPP); 1925 } 1926 } 1927 1928 /* 1929 * Discard the IP6 multicast options. 1930 */ 1931 void 1932 ip6_freemoptions(im6o) 1933 struct ip6_moptions *im6o; 1934 { 1935 struct in6_multi_mship *imm; 1936 1937 if (im6o == NULL) 1938 return; 1939 1940 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1941 LIST_REMOVE(imm, i6mm_chain); 1942 if (imm->i6mm_maddr) 1943 in6_delmulti(imm->i6mm_maddr); 1944 free(imm, M_IPMADDR); 1945 } 1946 free(im6o, M_IPMOPTS); 1947 } 1948 1949 /* 1950 * Set IPv6 outgoing packet options based on advanced API. 1951 */ 1952 int 1953 ip6_setpktoptions(control, opt, priv) 1954 struct mbuf *control; 1955 struct ip6_pktopts *opt; 1956 int priv; 1957 { 1958 struct cmsghdr *cm = 0; 1959 1960 if (control == 0 || opt == 0) 1961 return(EINVAL); 1962 1963 bzero(opt, sizeof(*opt)); 1964 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1965 1966 /* 1967 * XXX: Currently, we assume all the optional information is stored 1968 * in a single mbuf. 1969 */ 1970 if (control->m_next) 1971 return(EINVAL); 1972 1973 opt->ip6po_m = control; 1974 1975 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1976 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1977 cm = mtod(control, struct cmsghdr *); 1978 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1979 return(EINVAL); 1980 if (cm->cmsg_level != IPPROTO_IPV6) 1981 continue; 1982 1983 switch (cm->cmsg_type) { 1984 case IPV6_PKTINFO: 1985 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1986 return(EINVAL); 1987 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1988 if (opt->ip6po_pktinfo->ipi6_ifindex && 1989 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1990 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1991 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1992 1993 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1994 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1995 return(ENXIO); 1996 } 1997 1998 /* 1999 * Check if the requested source address is indeed a 2000 * unicast address assigned to the node, and can be 2001 * used as the packet's source address. 2002 */ 2003 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2004 struct ifaddr *ia; 2005 struct in6_ifaddr *ia6; 2006 struct sockaddr_in6 sin6; 2007 2008 bzero(&sin6, sizeof(sin6)); 2009 sin6.sin6_len = sizeof(sin6); 2010 sin6.sin6_family = AF_INET6; 2011 sin6.sin6_addr = 2012 opt->ip6po_pktinfo->ipi6_addr; 2013 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 2014 if (ia == NULL || 2015 (opt->ip6po_pktinfo->ipi6_ifindex && 2016 (ia->ifa_ifp->if_index != 2017 opt->ip6po_pktinfo->ipi6_ifindex))) { 2018 return(EADDRNOTAVAIL); 2019 } 2020 ia6 = (struct in6_ifaddr *)ia; 2021 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) != 0) { 2022 return(EADDRNOTAVAIL); 2023 } 2024 2025 /* 2026 * Check if the requested source address is 2027 * indeed a unicast address assigned to the 2028 * node. 2029 */ 2030 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 2031 return(EADDRNOTAVAIL); 2032 } 2033 break; 2034 2035 case IPV6_HOPLIMIT: 2036 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2037 return(EINVAL); 2038 2039 bcopy(CMSG_DATA(cm), &opt->ip6po_hlim, 2040 sizeof(opt->ip6po_hlim)); 2041 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2042 return(EINVAL); 2043 break; 2044 2045 case IPV6_NEXTHOP: 2046 if (!priv) 2047 return(EPERM); 2048 2049 if (cm->cmsg_len < sizeof(u_char) || 2050 /* check if cmsg_len is large enough for sa_len */ 2051 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2052 return(EINVAL); 2053 2054 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 2055 2056 break; 2057 2058 case IPV6_HOPOPTS: 2059 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2060 return(EINVAL); 2061 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2062 if (cm->cmsg_len != 2063 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 2064 return(EINVAL); 2065 break; 2066 2067 case IPV6_DSTOPTS: 2068 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2069 return(EINVAL); 2070 2071 /* 2072 * If there is no routing header yet, the destination 2073 * options header should be put on the 1st part. 2074 * Otherwise, the header should be on the 2nd part. 2075 * (See RFC 2460, section 4.1) 2076 */ 2077 if (opt->ip6po_rthdr == NULL) { 2078 opt->ip6po_dest1 = 2079 (struct ip6_dest *)CMSG_DATA(cm); 2080 if (cm->cmsg_len != 2081 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 2082 << 3)) 2083 return(EINVAL); 2084 } 2085 else { 2086 opt->ip6po_dest2 = 2087 (struct ip6_dest *)CMSG_DATA(cm); 2088 if (cm->cmsg_len != 2089 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 2090 << 3)) 2091 return(EINVAL); 2092 } 2093 break; 2094 2095 case IPV6_RTHDR: 2096 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2097 return(EINVAL); 2098 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 2099 if (cm->cmsg_len != 2100 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 2101 return(EINVAL); 2102 switch (opt->ip6po_rthdr->ip6r_type) { 2103 case IPV6_RTHDR_TYPE_0: 2104 if (opt->ip6po_rthdr->ip6r_segleft == 0) 2105 return(EINVAL); 2106 break; 2107 default: 2108 return(EINVAL); 2109 } 2110 break; 2111 2112 default: 2113 return(ENOPROTOOPT); 2114 } 2115 } 2116 2117 return(0); 2118 } 2119 2120 /* 2121 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2122 * packet to the input queue of a specified interface. Note that this 2123 * calls the output routine of the loopback "driver", but with an interface 2124 * pointer that might NOT be &loif -- easier than replicating that code here. 2125 */ 2126 void 2127 ip6_mloopback(ifp, m, dst) 2128 struct ifnet *ifp; 2129 struct mbuf *m; 2130 struct sockaddr_in6 *dst; 2131 { 2132 struct mbuf *copym; 2133 struct ip6_hdr *ip6; 2134 2135 copym = m_copy(m, 0, M_COPYALL); 2136 if (copym == NULL) 2137 return; 2138 2139 /* 2140 * Make sure to deep-copy IPv6 header portion in case the data 2141 * is in an mbuf cluster, so that we can safely override the IPv6 2142 * header portion later. 2143 */ 2144 if ((copym->m_flags & M_EXT) != 0 || 2145 copym->m_len < sizeof(struct ip6_hdr)) { 2146 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2147 if (copym == NULL) 2148 return; 2149 } 2150 2151 #ifdef DIAGNOSTIC 2152 if (copym->m_len < sizeof(*ip6)) { 2153 m_freem(copym); 2154 return; 2155 } 2156 #endif 2157 2158 ip6 = mtod(copym, struct ip6_hdr *); 2159 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 2160 ip6->ip6_src.s6_addr16[1] = 0; 2161 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 2162 ip6->ip6_dst.s6_addr16[1] = 0; 2163 2164 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 2165 } 2166 2167 /* 2168 * Chop IPv6 header off from the payload. 2169 */ 2170 static int 2171 ip6_splithdr(m, exthdrs) 2172 struct mbuf *m; 2173 struct ip6_exthdrs *exthdrs; 2174 { 2175 struct mbuf *mh; 2176 struct ip6_hdr *ip6; 2177 2178 ip6 = mtod(m, struct ip6_hdr *); 2179 if (m->m_len > sizeof(*ip6)) { 2180 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2181 if (mh == 0) { 2182 m_freem(m); 2183 return ENOBUFS; 2184 } 2185 M_COPY_PKTHDR(mh, m); 2186 MH_ALIGN(mh, sizeof(*ip6)); 2187 m->m_flags &= ~M_PKTHDR; 2188 m->m_len -= sizeof(*ip6); 2189 m->m_data += sizeof(*ip6); 2190 mh->m_next = m; 2191 m = mh; 2192 m->m_len = sizeof(*ip6); 2193 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2194 } 2195 exthdrs->ip6e_ip6 = m; 2196 return 0; 2197 } 2198 2199 /* 2200 * Compute IPv6 extension header length. 2201 */ 2202 int 2203 ip6_optlen(in6p) 2204 struct in6pcb *in6p; 2205 { 2206 int len; 2207 2208 if (!in6p->in6p_outputopts) 2209 return 0; 2210 2211 len = 0; 2212 #define elen(x) \ 2213 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2214 2215 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2216 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2217 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2218 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2219 return len; 2220 #undef elen 2221 } 2222
Indexes created Tue Sep 30 20:09:53 GMT 2025