ip6_output.c revision 1.1.2.1
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 #endif 71 72 #include <sys/param.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/errno.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 82 #include <net/if.h> 83 #include <net/route.h> 84 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet6/in6_systm.h> 88 #include <netinet6/ip6.h> 89 #include <netinet6/icmp6.h> 90 #if !defined(__FreeBSD__) || __FreeBSD__ < 3 91 #include <netinet6/in6_pcb.h> 92 #else 93 #include <netinet/in_pcb.h> 94 #endif 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/nd6.h> 97 98 #ifdef IPSEC 99 #include <netinet6/ipsec.h> 100 #include <netkey/key.h> 101 #include <netkey/key_debug.h> 102 #endif /* IPSEC */ 103 104 #include "loop.h" 105 106 struct ip6_exthdrs { 107 struct mbuf *ip6e_ip6; 108 struct mbuf *ip6e_hbh; 109 struct mbuf *ip6e_dest1; 110 struct mbuf *ip6e_rthdr; 111 struct mbuf *ip6e_dest2; 112 }; 113 114 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 115 struct socket *)); 116 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 117 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 118 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 119 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 120 struct ip6_frag **)); 121 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 122 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 123 #ifdef __bsdi__ 124 extern struct ifnet loif; 125 #endif 126 127 #ifdef __NetBSD__ 128 extern struct ifnet **ifindex2ifnet; 129 extern struct ifnet loif[NLOOP]; 130 #endif 131 132 /* 133 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 134 * header (with pri, len, nxt, hlim, src, dst). 135 * This function may modify ver and hlim only. 136 * The mbuf chain containing the packet will be freed. 137 * The mbuf opt, if present, will not be freed. 138 */ 139 int 140 ip6_output(m0, opt, ro, flags, im6o) 141 struct mbuf *m0; 142 struct ip6_pktopts *opt; 143 struct route_in6 *ro; 144 int flags; 145 struct ip6_moptions *im6o; 146 { 147 struct ip6_hdr *ip6, *mhip6; 148 struct ifnet *ifp; 149 struct mbuf *m = m0; 150 int hlen, tlen, len, off; 151 struct route_in6 ip6route; 152 struct sockaddr_in6 *dst; 153 int error = 0; 154 struct in6_ifaddr *ia; 155 u_long mtu; 156 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 157 struct ip6_exthdrs exthdrs; 158 struct in6_addr finaldst; 159 struct route_in6 *ro_pmtu = NULL; 160 int hdrsplit = 0; 161 int needipsec = 0; 162 #ifdef IPSEC 163 int needipsectun = 0; 164 struct socket *so; 165 struct secpolicy *sp = NULL; 166 167 /* for AH processing. stupid to have "socket" variable in IP layer... */ 168 so = (struct socket *)m->m_pkthdr.rcvif; 169 m->m_pkthdr.rcvif = NULL; 170 ip6 = mtod(m, struct ip6_hdr *); 171 #endif /* IPSEC */ 172 173 #define MAKE_EXTHDR(hp,mp) \ 174 { \ 175 if (hp) { \ 176 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 177 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 178 ((eh)->ip6e_len + 1) << 3); \ 179 if (error) \ 180 goto freehdrs; \ 181 } \ 182 } 183 184 bzero(&exthdrs, sizeof(exthdrs)); 185 if (opt) { 186 /* Hop-by-Hop options header */ 187 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 188 /* Destination options header(1st part) */ 189 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 190 /* Routing header */ 191 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 192 /* Destination options header(2nd part) */ 193 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 194 } 195 196 #ifdef IPSEC 197 /* get a security policy for this packet */ 198 if (so == NULL) 199 sp = ipsec6_getpolicybyaddr(m, 0, &error); 200 else 201 sp = ipsec6_getpolicybysock(m, so, &error); 202 203 if (sp == NULL) { 204 ipsec6stat.out_inval++; 205 goto bad; 206 } 207 208 error = 0; 209 210 /* check policy */ 211 switch (sp->policy) { 212 case IPSEC_POLICY_DISCARD: 213 /* 214 * This packet is just discarded. 215 */ 216 ipsec6stat.out_polvio++; 217 goto bad; 218 219 case IPSEC_POLICY_BYPASS: 220 case IPSEC_POLICY_NONE: 221 /* no need to do IPsec. */ 222 needipsec = 0; 223 break; 224 225 case IPSEC_POLICY_IPSEC: 226 if (sp->req == NULL) { 227 /* XXX should be panic ? */ 228 printf("ip6_output: No IPsec request specified.\n"); 229 error = EINVAL; 230 goto bad; 231 } 232 needipsec = 1; 233 break; 234 235 case IPSEC_POLICY_ENTRUST: 236 default: 237 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 238 } 239 #endif /* IPSEC */ 240 241 /* 242 * Calculate the total length of the extension header chain. 243 * Keep the length of the unfragmentable part for fragmentation. 244 */ 245 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 246 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 247 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 248 unfragpartlen = plen + sizeof(struct ip6_hdr); 249 /* NOTE: we don't add AH/ESP length here. do that later. */ 250 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 251 252 /* 253 * If we need IPsec, or there is at least one extension header, 254 * separate IP6 header from the payload. 255 */ 256 if ((needipsec || optlen) && !hdrsplit) { 257 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 258 m = NULL; 259 goto freehdrs; 260 } 261 m = exthdrs.ip6e_ip6; 262 hdrsplit++; 263 } 264 265 /* adjust pointer */ 266 ip6 = mtod(m, struct ip6_hdr *); 267 268 /* adjust mbuf packet header length */ 269 m->m_pkthdr.len += optlen; 270 plen = m->m_pkthdr.len - sizeof(*ip6); 271 272 /* If this is a jumbo payload, insert a jumbo payload option. */ 273 if (plen > IPV6_MAXPACKET) { 274 if (!hdrsplit) { 275 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 276 m = NULL; 277 goto freehdrs; 278 } 279 m = exthdrs.ip6e_ip6; 280 hdrsplit++; 281 } 282 /* adjust pointer */ 283 ip6 = mtod(m, struct ip6_hdr *); 284 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 285 goto freehdrs; 286 ip6->ip6_plen = 0; 287 } else 288 ip6->ip6_plen = htons(plen); 289 290 /* 291 * Concatenate headers and fill in next header fields. 292 * Here we have, on "m" 293 * IPv6 payload or 294 * IPv6 [esp* dest2 payload] 295 * and we insert headers accordingly. Finally, we should be getting: 296 * IPv6 hbh dest1 rthdr ah* dest2 payload or 297 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 298 */ 299 { 300 u_char *nexthdrp = &ip6->ip6_nxt; 301 struct mbuf *mprev = m; 302 303 /* 304 * we treat dest2 specially. this makes IPsec processing 305 * much easier. 306 */ 307 if (exthdrs.ip6e_dest2) { 308 if (!hdrsplit) 309 panic("assumption failed: hdr not split"); 310 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 311 ip6->ip6_nxt = IPPROTO_DSTOPTS; 312 } 313 314 #define MAKE_CHAIN(m,mp,p,i)\ 315 {\ 316 if (m) {\ 317 if (!hdrsplit) \ 318 panic("assumption failed: hdr not split"); \ 319 *mtod((m), u_char *) = *(p);\ 320 *(p) = (i);\ 321 p = mtod((m), u_char *);\ 322 (m)->m_next = (mp)->m_next;\ 323 (mp)->m_next = (m);\ 324 (mp) = (m);\ 325 }\ 326 } 327 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 328 nexthdrp, IPPROTO_HOPOPTS); 329 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 330 nexthdrp, IPPROTO_DSTOPTS); 331 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 332 nexthdrp, IPPROTO_ROUTING); 333 334 #ifdef IPSEC 335 if (!needipsec) 336 goto skip_ipsec2; 337 338 /* 339 * pointers after IPsec headers are not valid any more. 340 * other pointers need a great care too. 341 * (IPsec routines should not mangle mbufs prior to AH/ESP) 342 */ 343 exthdrs.ip6e_dest2 = NULL; 344 345 { 346 struct ip6_rthdr *rh = NULL; 347 int segleft_org = 0; 348 struct ipsec_output_state state; 349 350 if (exthdrs.ip6e_rthdr) { 351 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 352 segleft_org = rh->ip6r_segleft; 353 rh->ip6r_segleft = 0; 354 } 355 356 bzero(&state, sizeof(state)); 357 state.m = m; 358 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 359 &needipsectun); 360 m = state.m; 361 if (error) { 362 /* mbuf is already reclaimed in ipsec6_output_trans. */ 363 m = NULL; 364 switch (error) { 365 case EHOSTUNREACH: 366 case ENETUNREACH: 367 case EMSGSIZE: 368 case ENOBUFS: 369 case ENOMEM: 370 break; 371 default: 372 printf("ip6_output (ipsec): error code %d\n", error); 373 /*fall through*/ 374 case ENOENT: 375 /* don't show these error codes to the user */ 376 error = 0; 377 break; 378 } 379 goto bad; 380 } 381 if (exthdrs.ip6e_rthdr) { 382 /* ah6_output doesn't modify mbuf chain */ 383 rh->ip6r_segleft = segleft_org; 384 } 385 } 386 skip_ipsec2:; 387 #endif 388 } 389 390 /* 391 * If there is a routing header, replace destination address field 392 * with the first hop of the routing header. 393 */ 394 if (exthdrs.ip6e_rthdr) { 395 struct ip6_rthdr *rh = 396 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 397 struct ip6_rthdr *)); 398 struct ip6_rthdr0 *rh0; 399 400 finaldst = ip6->ip6_dst; 401 switch(rh->ip6r_type) { 402 case IPV6_RTHDR_TYPE_0: 403 rh0 = (struct ip6_rthdr0 *)rh; 404 ip6->ip6_dst = rh0->ip6r0_addr[0]; 405 bcopy((caddr_t)&rh0->ip6r0_addr[1], 406 (caddr_t)&rh0->ip6r0_addr[0], 407 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 408 ); 409 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 410 break; 411 default: /* is it possible? */ 412 error = EINVAL; 413 goto bad; 414 } 415 } 416 417 /* Source address validation */ 418 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 419 (flags & IPV6_DADOUTPUT) == 0) { 420 error = EOPNOTSUPP; 421 ip6stat.ip6s_badscope++; 422 goto bad; 423 } 424 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 425 error = EOPNOTSUPP; 426 ip6stat.ip6s_badscope++; 427 goto bad; 428 } 429 430 ip6stat.ip6s_localout++; 431 432 /* 433 * Route packet. 434 */ 435 if (ro == 0) { 436 ro = &ip6route; 437 bzero((caddr_t)ro, sizeof(*ro)); 438 } 439 ro_pmtu = ro; 440 if (opt && opt->ip6po_rthdr) 441 ro = &opt->ip6po_route; 442 dst = (struct sockaddr_in6 *)&ro->ro_dst; 443 /* 444 * If there is a cached route, 445 * check that it is to the same destination 446 * and is still up. If not, free it and try again. 447 */ 448 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 449 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 450 RTFREE(ro->ro_rt); 451 ro->ro_rt = (struct rtentry *)0; 452 } 453 if (ro->ro_rt == 0) { 454 bzero(dst, sizeof(*dst)); 455 dst->sin6_family = AF_INET6; 456 dst->sin6_len = sizeof(struct sockaddr_in6); 457 dst->sin6_addr = ip6->ip6_dst; 458 } 459 #ifdef IPSEC 460 if (needipsec && needipsectun) { 461 struct ipsec_output_state state; 462 463 /* 464 * All the extension headers will become inaccessible 465 * (since they can be encrypted). 466 * Don't panic, we need no more updates to extension headers 467 * on inner IPv6 packet (since they are now encapsulated). 468 * 469 * IPv6 [ESP|AH] IPv6 [extension headers] payload 470 */ 471 bzero(&exthdrs, sizeof(exthdrs)); 472 exthdrs.ip6e_ip6 = m; 473 474 bzero(&state, sizeof(state)); 475 state.m = m; 476 state.ro = (struct route *)ro; 477 state.dst = (struct sockaddr *)dst; 478 479 error = ipsec6_output_tunnel(&state, sp, flags); 480 481 m = state.m; 482 ro = (struct route_in6 *)state.ro; 483 dst = (struct sockaddr_in6 *)state.dst; 484 if (error) { 485 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 486 m0 = m = NULL; 487 m = NULL; 488 switch (error) { 489 case EHOSTUNREACH: 490 case ENETUNREACH: 491 case EMSGSIZE: 492 case ENOBUFS: 493 case ENOMEM: 494 break; 495 default: 496 printf("ip6_output (ipsec): error code %d\n", error); 497 /*fall through*/ 498 case ENOENT: 499 /* don't show these error codes to the user */ 500 error = 0; 501 break; 502 } 503 goto bad; 504 } 505 506 exthdrs.ip6e_ip6 = m; 507 } 508 #endif /*IPESC*/ 509 510 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 511 /* Unicast */ 512 513 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 514 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 515 /* xxx 516 * interface selection comes here 517 * if an interface is specified from an upper layer, 518 * ifp must point it. 519 */ 520 if (ro->ro_rt == 0) { 521 if (ro == &ip6route) /* xxx kazu */ 522 rtalloc((struct route *)ro); 523 else 524 rtcalloc((struct route *)ro); 525 } 526 if (ro->ro_rt == 0) { 527 ip6stat.ip6s_noroute++; 528 error = EHOSTUNREACH; 529 goto bad; 530 } 531 ia = ifatoia6(ro->ro_rt->rt_ifa); 532 ifp = ro->ro_rt->rt_ifp; 533 ro->ro_rt->rt_use++; 534 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 535 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 536 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 537 538 /* 539 * Check if there is the outgoing interface conflicts with 540 * the interface specified by ifi6_ifindex(if specified). 541 * Note that loopback interface is always okay. 542 * (this happens when we are sending packet toward my 543 * interface) 544 */ 545 if (opt && opt->ip6po_pktinfo 546 && opt->ip6po_pktinfo->ipi6_ifindex) { 547 if (!(ifp->if_flags & IFF_LOOPBACK) 548 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 549 ip6stat.ip6s_noroute++; 550 error = EHOSTUNREACH; 551 goto bad; 552 } 553 } 554 555 if (opt && opt->ip6po_hlim != -1) 556 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 557 } else { 558 /* Multicast */ 559 struct in6_multi *in6m; 560 561 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 562 563 /* 564 * See if the caller provided any multicast options 565 */ 566 ifp = NULL; 567 if (im6o != NULL) { 568 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 569 if (im6o->im6o_multicast_ifp != NULL) 570 ifp = im6o->im6o_multicast_ifp; 571 } else 572 ip6->ip6_hlim = ip6_defmcasthlim; 573 574 /* 575 * See if the caller provided the outgoing interface 576 * as an ancillary data. 577 * Boundary check for ifindex is assumed to be already done. 578 */ 579 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 580 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 581 582 /* 583 * If the destination is a node-local scope multicast, 584 * the packet should be loop-backed only. 585 */ 586 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 587 /* 588 * If the outgoing interface is already specified, 589 * it should be a loopback interface. 590 */ 591 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 592 ip6stat.ip6s_badscope++; 593 error = ENETUNREACH; /* XXX: better error? */ 594 goto bad; 595 } 596 else { 597 #ifdef __bsdi__ 598 ifp = &loif; 599 #else 600 ifp = &loif[0]; 601 #endif 602 } 603 } 604 605 if (opt && opt->ip6po_hlim != -1) 606 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 607 608 /* 609 * If caller did not provide an interface lookup a 610 * default in the routing table. This is either a 611 * default for the speicfied group (i.e. a host 612 * route), or a multicast default (a route for the 613 * ``net'' ff00::/8). 614 */ 615 if (ifp == NULL) { 616 if (ro->ro_rt == 0) { 617 #ifdef __FreeBSD__ 618 ro->ro_rt = rtalloc1((struct sockaddr *) 619 &ro->ro_dst, 0, 0UL); 620 #endif /*__FreeBSD__*/ 621 #if defined(__bsdi__) || defined(__NetBSD__) 622 ro->ro_rt = rtalloc1((struct sockaddr *) 623 &ro->ro_dst, 0); 624 #endif /*__bsdi__*/ 625 } 626 if (ro->ro_rt == 0) { 627 ip6stat.ip6s_noroute++; 628 error = EHOSTUNREACH; 629 goto bad; 630 } 631 ia = ifatoia6(ro->ro_rt->rt_ifa); 632 ifp = ro->ro_rt->rt_ifp; 633 ro->ro_rt->rt_use++; 634 } 635 /* 636 * Confirm that the outgoing interface supports multicast. 637 */ 638 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 639 ip6stat.ip6s_noroute++; 640 error = ENETUNREACH; 641 goto bad; 642 } 643 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 644 if (in6m != NULL && 645 (im6o == NULL || im6o->im6o_multicast_loop)) { 646 /* 647 * If we belong to the destination multicast group 648 * on the outgoing interface, and the caller did not 649 * forbid loopback, loop back a copy. 650 */ 651 ip6_mloopback(ifp, m, dst); 652 } else { 653 /* 654 * If we are acting as a multicast router, perform 655 * multicast forwarding as if the packet had just 656 * arrived on the interface to which we are about 657 * to send. The multicast forwarding function 658 * recursively calls this function, using the 659 * IPV6_FORWARDING flag to prevent infinite recursion. 660 * 661 * Multicasts that are looped back by ip6_mloopback(), 662 * above, will be forwarded by the ip6_input() routine, 663 * if necessary. 664 */ 665 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 666 if (ip6_mforward(ip6, ifp, m) != NULL) { 667 m_freem(m); 668 goto done; 669 } 670 } 671 } 672 /* 673 * Multicasts with a hoplimit of zero may be looped back, 674 * above, but must not be transmitted on a network. 675 * Also, multicasts addressed to the loopback interface 676 * are not sent -- the above call to ip6_mloopback() will 677 * loop back a copy if this host actually belongs to the 678 * destination group on the loopback interface. 679 */ 680 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 681 m_freem(m); 682 goto done; 683 } 684 } 685 686 /* 687 * Determine path MTU. 688 */ 689 if (ro_pmtu != ro) { 690 /* The first hop and the final destination may differ. */ 691 struct sockaddr_in6 *sin6_fin = 692 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 693 if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 694 !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, 695 &finaldst))) { 696 RTFREE(ro_pmtu->ro_rt); 697 ro_pmtu->ro_rt = (struct rtentry *)0; 698 } 699 if (ro_pmtu->ro_rt == 0) { 700 bzero(sin6_fin, sizeof(*sin6_fin)); 701 sin6_fin->sin6_family = AF_INET6; 702 sin6_fin->sin6_len = sizeof(struct sockaddr_in6); 703 sin6_fin->sin6_addr = finaldst; 704 705 #if 0 706 rtcalloc((struct route *)ro_pmtu); 707 #else 708 rtalloc((struct route *)ro_pmtu); 709 #endif 710 } 711 } 712 if (ro_pmtu->ro_rt != NULL) { 713 u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 714 715 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 716 if (mtu > ifmtu) { 717 /* 718 * The MTU on the route is larger than the MTU on 719 * the interface! This shouldn't happen, unless the 720 * MTU of the interface has been changed after the 721 * interface was brought up. Change the MTU in the 722 * route to match the interface MTU (as long as the 723 * field isn't locked). 724 */ 725 mtu = ifmtu; 726 if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) 727 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ 728 } 729 } else { 730 mtu = nd_ifinfo[ifp->if_index].linkmtu; 731 } 732 733 /* 734 * Fake link-local scope-class addresses 735 */ 736 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 737 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 738 ip6->ip6_src.s6_addr16[1] = 0; 739 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 740 ip6->ip6_dst.s6_addr16[1] = 0; 741 } 742 743 /* 744 * If the outgoing packet contains a hop-by-hop options header, 745 * it must be examined and processed even by the source node. 746 * (RFC 2460, section 4.) 747 */ 748 if (exthdrs.ip6e_hbh) { 749 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, 750 struct ip6_hbh *); 751 long dummy1; /* XXX unused */ 752 u_int32_t dummy2; /* XXX unused */ 753 754 /* 755 * XXX: if we have to send an ICMPv6 error to the sender, 756 * we need the M_LOOP flag since icmp6_error() expects 757 * the IPv6 and the hop-by-hop options header are 758 * continuous unless the flag is set. 759 */ 760 m->m_flags |= M_LOOP; 761 m->m_pkthdr.rcvif = ifp; 762 if (ip6_process_hopopts(m, 763 (u_int8_t *)(hbh + 1), 764 ((hbh->ip6h_len + 1) << 3) - 765 sizeof(struct ip6_hbh), 766 &dummy1, &dummy2) < 0) { 767 /* m was already freed at this point */ 768 error = EINVAL;/* better error? */ 769 goto done; 770 } 771 m->m_flags &= ~M_LOOP; /* XXX */ 772 m->m_pkthdr.rcvif = NULL; 773 } 774 775 /* 776 * Send the packet to the outgoing interface. 777 * If necessary, do IPv6 fragmentation before sending. 778 */ 779 tlen = m->m_pkthdr.len; 780 if (tlen <= mtu 781 #ifdef notyet 782 /* 783 * On any link that cannot convey a 1280-octet packet in one piece, 784 * link-specific fragmentation and reassembly must be provided at 785 * a layer below IPv6. [RFC 2460, sec.5] 786 * Thus if the interface has ability of link-level fragmentation, 787 * we can just send the packet even if the packet size is 788 * larger than the link's MTU. 789 * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... 790 */ 791 792 || ifp->if_flags & IFF_FRAGMENTABLE 793 #endif 794 ) 795 { 796 #ifdef NEWIP6OUTPUT 797 error = nd6_output(ifp, m, dst, ro->ro_rt); 798 #else 799 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 800 ro->ro_rt); 801 #endif 802 goto done; 803 } else if (mtu < IPV6_MMTU) { 804 /* 805 * note that path MTU is never less than IPV6_MMTU 806 * (see icmp6_input). 807 */ 808 error = EMSGSIZE; 809 goto bad; 810 } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ 811 error = EMSGSIZE; 812 goto bad; 813 } else { 814 struct mbuf **mnext, *m_frgpart; 815 struct ip6_frag *ip6f; 816 u_long id = htonl(ip6_id++); 817 u_char nextproto; 818 819 /* 820 * Too large for the destination or interface; 821 * fragment if possible. 822 * Must be able to put at least 8 bytes per fragment. 823 */ 824 hlen = unfragpartlen; 825 if (mtu > IPV6_MAXPACKET) 826 mtu = IPV6_MAXPACKET; 827 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 828 if (len < 8) { 829 error = EMSGSIZE; 830 goto bad; 831 } 832 833 mnext = &m->m_nextpkt; 834 835 /* 836 * Change the next header field of the last header in the 837 * unfragmentable part. 838 */ 839 if (exthdrs.ip6e_rthdr) { 840 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 841 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 842 } 843 else if (exthdrs.ip6e_dest1) { 844 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 845 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 846 } 847 else if (exthdrs.ip6e_hbh) { 848 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 849 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 850 } 851 else { 852 nextproto = ip6->ip6_nxt; 853 ip6->ip6_nxt = IPPROTO_FRAGMENT; 854 } 855 856 /* 857 * Loop through length of segment after first fragment, 858 * make new header and copy data of each part and link onto chain. 859 */ 860 m0 = m; 861 for (off = hlen; off < tlen; off += len) { 862 MGETHDR(m, M_DONTWAIT, MT_HEADER); 863 if (!m) { 864 error = ENOBUFS; 865 ip6stat.ip6s_odropped++; 866 goto sendorfree; 867 } 868 m->m_flags = m0->m_flags & M_COPYFLAGS; 869 *mnext = m; 870 mnext = &m->m_nextpkt; 871 m->m_data += max_linkhdr; 872 mhip6 = mtod(m, struct ip6_hdr *); 873 *mhip6 = *ip6; 874 m->m_len = sizeof(*mhip6); 875 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 876 if (error) { 877 ip6stat.ip6s_odropped++; 878 goto sendorfree; 879 } 880 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 881 if (off + len >= tlen) 882 len = tlen - off; 883 else 884 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 885 mhip6->ip6_plen = htons((u_short)(len + hlen + 886 sizeof(*ip6f) - 887 sizeof(struct ip6_hdr))); 888 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 889 error = ENOBUFS; 890 ip6stat.ip6s_odropped++; 891 goto sendorfree; 892 } 893 m_cat(m, m_frgpart); 894 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 895 m->m_pkthdr.rcvif = (struct ifnet *)0; 896 ip6f->ip6f_reserved = 0; 897 ip6f->ip6f_ident = id; 898 ip6f->ip6f_nxt = nextproto; 899 ip6stat.ip6s_ofragments++; 900 } 901 } 902 903 /* 904 * Remove leading garbages. 905 */ 906 sendorfree: 907 m = m0->m_nextpkt; 908 m0->m_nextpkt = 0; 909 m_freem(m0); 910 for (m0 = m; m; m = m0) { 911 m0 = m->m_nextpkt; 912 m->m_nextpkt = 0; 913 if (error == 0) { 914 #ifdef NEWIP6OUTPUT 915 error = nd6_output(ifp, m, dst, ro->ro_rt); 916 #else 917 error = (*ifp->if_output)(ifp, m, 918 (struct sockaddr *)dst, 919 ro->ro_rt); 920 #endif 921 } 922 else 923 m_freem(m); 924 } 925 926 if (error == 0) 927 ip6stat.ip6s_fragmented++; 928 929 done: 930 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 931 RTFREE(ro->ro_rt); 932 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 933 RTFREE(ro_pmtu->ro_rt); 934 } 935 936 #ifdef IPSEC 937 if (sp != NULL) 938 key_freesp(sp); 939 #endif /* IPSEC */ 940 941 return(error); 942 943 freehdrs: 944 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 945 m_freem(exthdrs.ip6e_dest1); 946 m_freem(exthdrs.ip6e_rthdr); 947 m_freem(exthdrs.ip6e_dest2); 948 /* fall through */ 949 bad: 950 m_freem(m); 951 goto done; 952 } 953 954 static int 955 ip6_copyexthdr(mp, hdr, hlen) 956 struct mbuf **mp; 957 caddr_t hdr; 958 int hlen; 959 { 960 struct mbuf *m; 961 962 if (hlen > MCLBYTES) 963 return(ENOBUFS); /* XXX */ 964 965 MGET(m, M_DONTWAIT, MT_DATA); 966 if (!m) 967 return(ENOBUFS); 968 969 if (hlen > MLEN) { 970 MCLGET(m, M_DONTWAIT); 971 if ((m->m_flags & M_EXT) == 0) { 972 m_free(m); 973 return(ENOBUFS); 974 } 975 } 976 m->m_len = hlen; 977 if (hdr) 978 bcopy(hdr, mtod(m, caddr_t), hlen); 979 980 *mp = m; 981 return(0); 982 } 983 984 /* 985 * Insert jumbo payload option. 986 */ 987 static int 988 ip6_insert_jumboopt(exthdrs, plen) 989 struct ip6_exthdrs *exthdrs; 990 u_int32_t plen; 991 { 992 struct mbuf *mopt; 993 u_char *optbuf; 994 995 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 996 997 /* 998 * If there is no hop-by-hop options header, allocate new one. 999 * If there is one but it doesn't have enough space to store the 1000 * jumbo payload option, allocate a cluster to store the whole options. 1001 * Otherwise, use it to store the options. 1002 */ 1003 if (exthdrs->ip6e_hbh == 0) { 1004 MGET(mopt, M_DONTWAIT, MT_DATA); 1005 if (mopt == 0) 1006 return(ENOBUFS); 1007 mopt->m_len = JUMBOOPTLEN; 1008 optbuf = mtod(mopt, u_char *); 1009 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1010 exthdrs->ip6e_hbh = mopt; 1011 } 1012 else { 1013 struct ip6_hbh *hbh; 1014 1015 mopt = exthdrs->ip6e_hbh; 1016 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1017 caddr_t oldoptp = mtod(mopt, caddr_t); 1018 int oldoptlen = mopt->m_len; 1019 1020 if (mopt->m_flags & M_EXT) 1021 return(ENOBUFS); /* XXX */ 1022 MCLGET(mopt, M_DONTWAIT); 1023 if ((mopt->m_flags & M_EXT) == 0) 1024 return(ENOBUFS); 1025 1026 bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); 1027 optbuf = mtod(mopt, caddr_t) + oldoptlen; 1028 mopt->m_len = oldoptlen + JUMBOOPTLEN; 1029 } 1030 else { 1031 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1032 mopt->m_len += JUMBOOPTLEN; 1033 } 1034 optbuf[0] = IP6OPT_PADN; 1035 optbuf[1] = 1; 1036 1037 /* 1038 * Adjust the header length according to the pad and 1039 * the jumbo payload option. 1040 */ 1041 hbh = mtod(mopt, struct ip6_hbh *); 1042 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1043 } 1044 1045 /* fill in the option. */ 1046 optbuf[2] = IP6OPT_JUMBO; 1047 optbuf[3] = 4; 1048 *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); 1049 1050 /* finally, adjust the packet header length */ 1051 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1052 1053 return(0); 1054 #undef JUMBOOPTLEN 1055 } 1056 1057 /* 1058 * Insert fragment header and copy unfragmentable header portions. 1059 */ 1060 static int 1061 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1062 struct mbuf *m0, *m; 1063 int hlen; 1064 struct ip6_frag **frghdrp; 1065 { 1066 struct mbuf *n, *mlast; 1067 1068 if (hlen > sizeof(struct ip6_hdr)) { 1069 n = m_copym(m0, sizeof(struct ip6_hdr), 1070 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1071 if (n == 0) 1072 return(ENOBUFS); 1073 m->m_next = n; 1074 } 1075 else 1076 n = m; 1077 1078 /* Search for the last mbuf of unfragmentable part. */ 1079 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1080 ; 1081 1082 if ((mlast->m_flags & M_EXT) == 0 && 1083 M_TRAILINGSPACE(mlast) < sizeof(struct ip6_frag)) { 1084 /* use the trailing space of the last mbuf for the fragment hdr */ 1085 *frghdrp = 1086 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1087 mlast->m_len += sizeof(struct ip6_frag); 1088 m->m_pkthdr.len += sizeof(struct ip6_frag); 1089 } 1090 else { 1091 /* allocate a new mbuf for the fragment header */ 1092 struct mbuf *mfrg; 1093 1094 MGET(mfrg, M_DONTWAIT, MT_DATA); 1095 if (mfrg == 0) 1096 return(ENOBUFS); 1097 mfrg->m_len = sizeof(struct ip6_frag); 1098 *frghdrp = mtod(mfrg, struct ip6_frag *); 1099 mlast->m_next = mfrg; 1100 } 1101 1102 return(0); 1103 } 1104 1105 /* 1106 * IP6 socket option processing. 1107 */ 1108 int 1109 ip6_ctloutput(op, so, level, optname, mp) 1110 int op; 1111 struct socket *so; 1112 int level, optname; 1113 struct mbuf **mp; 1114 { 1115 register struct in6pcb *in6p = sotoin6pcb(so); 1116 register struct mbuf *m = *mp; 1117 register int optval = 0; 1118 int error = 0; 1119 struct proc *p = curproc; /* XXX */ 1120 1121 if (level == IPPROTO_IPV6) 1122 switch (op) { 1123 1124 case PRCO_SETOPT: 1125 switch (optname) { 1126 case IPV6_PKTOPTIONS: 1127 return(ip6_pcbopts(&in6p->in6p_outputopts, 1128 m, so)); 1129 case IPV6_HOPOPTS: 1130 case IPV6_DSTOPTS: 1131 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1132 error = EPERM; 1133 break; 1134 } 1135 /* fall through */ 1136 case IPV6_UNICAST_HOPS: 1137 case IPV6_RECVOPTS: 1138 case IPV6_RECVRETOPTS: 1139 case IPV6_RECVDSTADDR: 1140 case IPV6_PKTINFO: 1141 case IPV6_HOPLIMIT: 1142 case IPV6_RTHDR: 1143 case IPV6_CHECKSUM: 1144 case IPV6_FAITH: 1145 if (!m || m->m_len != sizeof(int)) 1146 error = EINVAL; 1147 else { 1148 optval = *mtod(m, int *); 1149 switch (optname) { 1150 1151 case IPV6_UNICAST_HOPS: 1152 if (optval < -1 || optval >= 256) 1153 error = EINVAL; 1154 else { 1155 /* -1 = kernel default */ 1156 in6p->in6p_hops = optval; 1157 } 1158 break; 1159 #define OPTSET(bit) \ 1160 if (optval) \ 1161 in6p->in6p_flags |= bit; \ 1162 else \ 1163 in6p->in6p_flags &= ~bit; 1164 1165 case IPV6_RECVOPTS: 1166 OPTSET(IN6P_RECVOPTS); 1167 break; 1168 1169 case IPV6_RECVRETOPTS: 1170 OPTSET(IN6P_RECVRETOPTS); 1171 break; 1172 1173 case IPV6_RECVDSTADDR: 1174 OPTSET(IN6P_RECVDSTADDR); 1175 break; 1176 1177 case IPV6_PKTINFO: 1178 OPTSET(IN6P_PKTINFO); 1179 break; 1180 1181 case IPV6_HOPLIMIT: 1182 OPTSET(IN6P_HOPLIMIT); 1183 break; 1184 1185 case IPV6_HOPOPTS: 1186 OPTSET(IN6P_HOPOPTS); 1187 break; 1188 1189 case IPV6_DSTOPTS: 1190 OPTSET(IN6P_DSTOPTS); 1191 break; 1192 1193 case IPV6_RTHDR: 1194 OPTSET(IN6P_RTHDR); 1195 break; 1196 1197 case IPV6_CHECKSUM: 1198 in6p->in6p_cksum = optval; 1199 break; 1200 1201 case IPV6_FAITH: 1202 OPTSET(IN6P_FAITH); 1203 break; 1204 } 1205 } 1206 break; 1207 #undef OPTSET 1208 1209 case IPV6_MULTICAST_IF: 1210 case IPV6_MULTICAST_HOPS: 1211 case IPV6_MULTICAST_LOOP: 1212 case IPV6_JOIN_GROUP: 1213 case IPV6_LEAVE_GROUP: 1214 error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); 1215 break; 1216 1217 #ifdef IPSEC 1218 case IPV6_IPSEC_POLICY: 1219 { 1220 caddr_t req = NULL; 1221 int len = 0; 1222 int priv = 0; 1223 #ifdef __NetBSD__ 1224 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) 1225 priv = 0; 1226 else 1227 priv = 1; 1228 #else 1229 priv = (in6p->in6p_socket->so_state & SS_PRIV); 1230 #endif 1231 if (m != 0) { 1232 req = mtod(m, caddr_t); 1233 len = m->m_len; 1234 } 1235 error = ipsec_set_policy(&in6p->in6p_sp, 1236 optname, req, len, 1237 priv); 1238 } 1239 break; 1240 #endif /* IPSEC */ 1241 1242 default: 1243 error = ENOPROTOOPT; 1244 break; 1245 } 1246 if (m) 1247 (void)m_free(m); 1248 break; 1249 1250 case PRCO_GETOPT: 1251 switch (optname) { 1252 1253 case IPV6_OPTIONS: 1254 case IPV6_RETOPTS: 1255 #if 0 1256 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1257 if (in6p->in6p_options) { 1258 m->m_len = in6p->in6p_options->m_len; 1259 bcopy(mtod(in6p->in6p_options, caddr_t), 1260 mtod(m, caddr_t), 1261 (unsigned)m->m_len); 1262 } else 1263 m->m_len = 0; 1264 break; 1265 #else 1266 error = ENOPROTOOPT; 1267 break; 1268 #endif 1269 1270 case IPV6_PKTOPTIONS: 1271 if (in6p->in6p_options) { 1272 *mp = m_copym(in6p->in6p_options, 0, 1273 M_COPYALL, M_WAIT); 1274 } else { 1275 *mp = m_get(M_WAIT, MT_SOOPTS); 1276 (*mp)->m_len = 0; 1277 } 1278 break; 1279 1280 case IPV6_HOPOPTS: 1281 case IPV6_DSTOPTS: 1282 if (p == 0 || suser(p->p_ucred, &p->p_acflag)) { 1283 error = EPERM; 1284 break; 1285 } 1286 /* fall through */ 1287 case IPV6_UNICAST_HOPS: 1288 case IPV6_RECVOPTS: 1289 case IPV6_RECVRETOPTS: 1290 case IPV6_RECVDSTADDR: 1291 case IPV6_PKTINFO: 1292 case IPV6_HOPLIMIT: 1293 case IPV6_RTHDR: 1294 case IPV6_CHECKSUM: 1295 case IPV6_FAITH: 1296 *mp = m = m_get(M_WAIT, MT_SOOPTS); 1297 m->m_len = sizeof(int); 1298 switch (optname) { 1299 1300 case IPV6_UNICAST_HOPS: 1301 optval = in6p->in6p_hops; 1302 break; 1303 1304 #define OPTBIT(bit) (in6p->in6p_flags & bit ? 1 : 0) 1305 1306 case IPV6_RECVOPTS: 1307 optval = OPTBIT(IN6P_RECVOPTS); 1308 break; 1309 1310 case IPV6_RECVRETOPTS: 1311 optval = OPTBIT(IN6P_RECVRETOPTS); 1312 break; 1313 1314 case IPV6_RECVDSTADDR: 1315 optval = OPTBIT(IN6P_RECVDSTADDR); 1316 break; 1317 1318 case IPV6_PKTINFO: 1319 optval = OPTBIT(IN6P_PKTINFO); 1320 break; 1321 1322 case IPV6_HOPLIMIT: 1323 optval = OPTBIT(IN6P_HOPLIMIT); 1324 break; 1325 1326 case IPV6_HOPOPTS: 1327 optval = OPTBIT(IN6P_HOPOPTS); 1328 break; 1329 1330 case IPV6_DSTOPTS: 1331 optval = OPTBIT(IN6P_DSTOPTS); 1332 break; 1333 1334 case IPV6_RTHDR: 1335 optval = OPTBIT(IN6P_RTHDR); 1336 break; 1337 1338 case IPV6_CHECKSUM: 1339 optval = in6p->in6p_cksum; 1340 break; 1341 1342 case IPV6_FAITH: 1343 optval = OPTBIT(IN6P_FAITH); 1344 break; 1345 } 1346 *mtod(m, int *) = optval; 1347 break; 1348 1349 case IPV6_MULTICAST_IF: 1350 case IPV6_MULTICAST_HOPS: 1351 case IPV6_MULTICAST_LOOP: 1352 case IPV6_JOIN_GROUP: 1353 case IPV6_LEAVE_GROUP: 1354 error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); 1355 break; 1356 1357 #ifdef IPSEC 1358 case IPV6_IPSEC_POLICY: 1359 error = ipsec_get_policy(in6p->in6p_sp, mp); 1360 break; 1361 #endif /* IPSEC */ 1362 1363 default: 1364 error = ENOPROTOOPT; 1365 break; 1366 } 1367 break; 1368 } 1369 else { 1370 error = EINVAL; 1371 if (op == PRCO_SETOPT && *mp) 1372 (void)m_free(*mp); 1373 } 1374 return(error); 1375 } 1376 1377 /* 1378 * Set up IP6 options in pcb for insertion in output packets. 1379 * Store in mbuf with pointer in pcbopt, adding pseudo-option 1380 * with destination address if source routed. 1381 */ 1382 static int 1383 ip6_pcbopts(pktopt, m, so) 1384 struct ip6_pktopts **pktopt; 1385 register struct mbuf *m; 1386 struct socket *so; 1387 { 1388 register struct ip6_pktopts *opt = *pktopt; 1389 int error = 0; 1390 struct proc *p = curproc; /* XXX */ 1391 int priv = 0; 1392 1393 /* turn off any old options. */ 1394 if (opt) { 1395 if (opt->ip6po_m) 1396 (void)m_free(opt->ip6po_m); 1397 } 1398 else 1399 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1400 *pktopt = 0; 1401 1402 if (!m || m->m_len == 0) { 1403 /* 1404 * Only turning off any previous options. 1405 */ 1406 if (opt) 1407 free(opt, M_IP6OPT); 1408 if (m) 1409 (void)m_free(m); 1410 return(0); 1411 } 1412 1413 /* set options specified by user. */ 1414 if (p && !suser(p->p_ucred, &p->p_acflag)) 1415 priv = 1; 1416 if ((error = ip6_setpktoptions(m, opt, priv)) != 0) { 1417 (void)m_free(m); 1418 return(error); 1419 } 1420 *pktopt = opt; 1421 return(0); 1422 } 1423 1424 /* 1425 * Set the IP6 multicast options in response to user setsockopt(). 1426 */ 1427 static int 1428 ip6_setmoptions(optname, im6op, m) 1429 int optname; 1430 struct ip6_moptions **im6op; 1431 struct mbuf *m; 1432 { 1433 int error = 0; 1434 u_int loop, ifindex; 1435 struct ipv6_mreq *mreq; 1436 struct ifnet *ifp; 1437 struct ip6_moptions *im6o = *im6op; 1438 struct route_in6 ro; 1439 struct sockaddr_in6 *dst; 1440 struct in6_multi_mship *imm; 1441 struct proc *p = curproc; /* XXX */ 1442 1443 if (im6o == NULL) { 1444 /* 1445 * No multicast option buffer attached to the pcb; 1446 * allocate one and initialize to default values. 1447 */ 1448 im6o = (struct ip6_moptions *) 1449 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 1450 1451 if (im6o == NULL) 1452 return(ENOBUFS); 1453 *im6op = im6o; 1454 im6o->im6o_multicast_ifp = NULL; 1455 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1456 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 1457 LIST_INIT(&im6o->im6o_memberships); 1458 } 1459 1460 switch (optname) { 1461 1462 case IPV6_MULTICAST_IF: 1463 /* 1464 * Select the interface for outgoing multicast packets. 1465 */ 1466 if (m == NULL || m->m_len != sizeof(u_int)) { 1467 error = EINVAL; 1468 break; 1469 } 1470 ifindex = *(mtod(m, u_int *)); 1471 if (ifindex < 0 || if_index < ifindex) { 1472 error = ENXIO; /* XXX EINVAL? */ 1473 break; 1474 } 1475 ifp = ifindex2ifnet[ifindex]; 1476 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1477 error = EADDRNOTAVAIL; 1478 break; 1479 } 1480 im6o->im6o_multicast_ifp = ifp; 1481 break; 1482 1483 case IPV6_MULTICAST_HOPS: 1484 { 1485 /* 1486 * Set the IP6 hoplimit for outgoing multicast packets. 1487 */ 1488 int optval; 1489 if (m == NULL || m->m_len != sizeof(int)) { 1490 error = EINVAL; 1491 break; 1492 } 1493 optval = *(mtod(m, u_int *)); 1494 if (optval < -1 || optval >= 256) 1495 error = EINVAL; 1496 else if (optval == -1) 1497 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 1498 else 1499 im6o->im6o_multicast_hlim = optval; 1500 break; 1501 } 1502 1503 case IPV6_MULTICAST_LOOP: 1504 /* 1505 * Set the loopback flag for outgoing multicast packets. 1506 * Must be zero or one. 1507 */ 1508 if (m == NULL || m->m_len != sizeof(u_int) || 1509 (loop = *(mtod(m, u_int *))) > 1) { 1510 error = EINVAL; 1511 break; 1512 } 1513 im6o->im6o_multicast_loop = loop; 1514 break; 1515 1516 case IPV6_JOIN_GROUP: 1517 /* 1518 * Add a multicast group membership. 1519 * Group must be a valid IP6 multicast address. 1520 */ 1521 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1522 error = EINVAL; 1523 break; 1524 } 1525 mreq = mtod(m, struct ipv6_mreq *); 1526 if (IN6_IS_ADDR_ANY(&mreq->ipv6mr_multiaddr)) { 1527 /* 1528 * We use the unspecified address to specify to accept 1529 * all multicast addresses. Only super user is allowed 1530 * to do this. 1531 */ 1532 if (suser(p->p_ucred, &p->p_acflag)) { 1533 error = EACCES; 1534 break; 1535 } 1536 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1537 error = EINVAL; 1538 break; 1539 } 1540 1541 /* 1542 * If the interface is specified, validate it. 1543 */ 1544 if (mreq->ipv6mr_interface < 0 1545 || if_index < mreq->ipv6mr_interface) { 1546 error = ENXIO; /* XXX EINVAL? */ 1547 break; 1548 } 1549 /* 1550 * If no interface was explicitly specified, choose an 1551 * appropriate one according to the given multicast address. 1552 */ 1553 if (mreq->ipv6mr_interface == 0) { 1554 /* 1555 * If the multicast address is in node-local scope, 1556 * the interface should be a loopback interface. 1557 * Otherwise, look up the routing table for the 1558 * address, and choose the outgoing interface. 1559 * XXX: is it a good approach? 1560 */ 1561 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 1562 #ifdef __bsdi__ 1563 ifp = &loif; 1564 #else 1565 ifp = &loif[0]; 1566 #endif 1567 } 1568 else { 1569 ro.ro_rt = NULL; 1570 dst = (struct sockaddr_in6 *)&ro.ro_dst; 1571 bzero(dst, sizeof(*dst)); 1572 dst->sin6_len = sizeof(struct sockaddr_in6); 1573 dst->sin6_family = AF_INET6; 1574 dst->sin6_addr = mreq->ipv6mr_multiaddr; 1575 rtalloc((struct route *)&ro); 1576 if (ro.ro_rt == NULL) { 1577 error = EADDRNOTAVAIL; 1578 break; 1579 } 1580 ifp = ro.ro_rt->rt_ifp; 1581 rtfree(ro.ro_rt); 1582 } 1583 } else 1584 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1585 1586 /* 1587 * See if we found an interface, and confirm that it 1588 * supports multicast 1589 */ 1590 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 1591 error = EADDRNOTAVAIL; 1592 break; 1593 } 1594 /* 1595 * Put interface index into the multicast address, 1596 * if the address has link-local scope. 1597 */ 1598 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1599 mreq->ipv6mr_multiaddr.s6_addr16[1] 1600 = htons(mreq->ipv6mr_interface); 1601 } 1602 /* 1603 * See if the membership already exists. 1604 */ 1605 for (imm = im6o->im6o_memberships.lh_first; 1606 imm != NULL; imm = imm->i6mm_chain.le_next) 1607 if (imm->i6mm_maddr->in6m_ifp == ifp && 1608 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1609 &mreq->ipv6mr_multiaddr)) 1610 break; 1611 if (imm != NULL) { 1612 error = EADDRINUSE; 1613 break; 1614 } 1615 /* 1616 * Everything looks good; add a new record to the multicast 1617 * address list for the given interface. 1618 */ 1619 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 1620 if (imm == NULL) { 1621 error = ENOBUFS; 1622 break; 1623 } 1624 if ((imm->i6mm_maddr = 1625 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 1626 free(imm, M_IPMADDR); 1627 break; 1628 } 1629 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 1630 break; 1631 1632 case IPV6_LEAVE_GROUP: 1633 /* 1634 * Drop a multicast group membership. 1635 * Group must be a valid IP6 multicast address. 1636 */ 1637 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 1638 error = EINVAL; 1639 break; 1640 } 1641 mreq = mtod(m, struct ipv6_mreq *); 1642 if (IN6_IS_ADDR_ANY(&mreq->ipv6mr_multiaddr)) { 1643 if (suser(p->p_ucred, &p->p_acflag)) { 1644 error = EACCES; 1645 break; 1646 } 1647 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 1648 error = EINVAL; 1649 break; 1650 } 1651 /* 1652 * If an interface address was specified, get a pointer 1653 * to its ifnet structure. 1654 */ 1655 if (mreq->ipv6mr_interface < 0 1656 || if_index < mreq->ipv6mr_interface) { 1657 error = ENXIO; /* XXX EINVAL? */ 1658 break; 1659 } 1660 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 1661 /* 1662 * Put interface index into the multicast address, 1663 * if the address has link-local scope. 1664 */ 1665 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 1666 mreq->ipv6mr_multiaddr.s6_addr16[1] 1667 = htons(mreq->ipv6mr_interface); 1668 } 1669 /* 1670 * Find the membership in the membership list. 1671 */ 1672 for (imm = im6o->im6o_memberships.lh_first; 1673 imm != NULL; imm = imm->i6mm_chain.le_next) { 1674 if ((ifp == NULL || 1675 imm->i6mm_maddr->in6m_ifp == ifp) && 1676 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 1677 &mreq->ipv6mr_multiaddr)) 1678 break; 1679 } 1680 if (imm == NULL) { 1681 /* Unable to resolve interface */ 1682 error = EADDRNOTAVAIL; 1683 break; 1684 } 1685 /* 1686 * Give up the multicast address record to which the 1687 * membership points. 1688 */ 1689 LIST_REMOVE(imm, i6mm_chain); 1690 in6_delmulti(imm->i6mm_maddr); 1691 free(imm, M_IPMADDR); 1692 break; 1693 1694 default: 1695 error = EOPNOTSUPP; 1696 break; 1697 } 1698 1699 /* 1700 * If all options have default values, no need to keep the mbuf. 1701 */ 1702 if (im6o->im6o_multicast_ifp == NULL && 1703 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 1704 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 1705 im6o->im6o_memberships.lh_first == NULL) { 1706 free(*im6op, M_IPMOPTS); 1707 *im6op = NULL; 1708 } 1709 1710 return(error); 1711 } 1712 1713 /* 1714 * Return the IP6 multicast options in response to user getsockopt(). 1715 */ 1716 static int 1717 ip6_getmoptions(optname, im6o, mp) 1718 int optname; 1719 register struct ip6_moptions *im6o; 1720 register struct mbuf **mp; 1721 { 1722 u_int *hlim, *loop, *ifindex; 1723 1724 *mp = m_get(M_WAIT, MT_SOOPTS); 1725 1726 switch (optname) { 1727 1728 case IPV6_MULTICAST_IF: 1729 ifindex = mtod(*mp, u_int *); 1730 (*mp)->m_len = sizeof(u_int); 1731 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 1732 *ifindex = 0; 1733 else 1734 *ifindex = im6o->im6o_multicast_ifp->if_index; 1735 return(0); 1736 1737 case IPV6_MULTICAST_HOPS: 1738 hlim = mtod(*mp, u_int *); 1739 (*mp)->m_len = sizeof(u_int); 1740 if (im6o == NULL) 1741 *hlim = ip6_defmcasthlim; 1742 else 1743 *hlim = im6o->im6o_multicast_hlim; 1744 return(0); 1745 1746 case IPV6_MULTICAST_LOOP: 1747 loop = mtod(*mp, u_int *); 1748 (*mp)->m_len = sizeof(u_int); 1749 if (im6o == NULL) 1750 *loop = ip6_defmcasthlim; 1751 else 1752 *loop = im6o->im6o_multicast_loop; 1753 return(0); 1754 1755 default: 1756 return(EOPNOTSUPP); 1757 } 1758 } 1759 1760 /* 1761 * Discard the IP6 multicast options. 1762 */ 1763 void 1764 ip6_freemoptions(im6o) 1765 register struct ip6_moptions *im6o; 1766 { 1767 struct in6_multi_mship *imm; 1768 1769 if (im6o == NULL) 1770 return; 1771 1772 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 1773 LIST_REMOVE(imm, i6mm_chain); 1774 if (imm->i6mm_maddr) 1775 in6_delmulti(imm->i6mm_maddr); 1776 free(imm, M_IPMADDR); 1777 } 1778 free(im6o, M_IPMOPTS); 1779 } 1780 1781 /* 1782 * Set IPv6 outgoing packet options based on advanced API. 1783 */ 1784 int 1785 ip6_setpktoptions(control, opt, priv) 1786 struct mbuf *control; 1787 struct ip6_pktopts *opt; 1788 int priv; 1789 { 1790 register struct cmsghdr *cm = 0; 1791 1792 if (control == 0 || opt == 0) 1793 return(EINVAL); 1794 1795 bzero(opt, sizeof(*opt)); 1796 opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ 1797 1798 /* 1799 * XXX: Currently, we assume all the optional information is stored 1800 * in a single mbuf. 1801 */ 1802 if (control->m_next) 1803 return(EINVAL); 1804 1805 opt->ip6po_m = control; 1806 1807 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 1808 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 1809 cm = mtod(control, struct cmsghdr *); 1810 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 1811 return(EINVAL); 1812 if (cm->cmsg_level != IPPROTO_IPV6) 1813 continue; 1814 1815 switch(cm->cmsg_type) { 1816 case IPV6_PKTINFO: 1817 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 1818 return(EINVAL); 1819 opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); 1820 if (opt->ip6po_pktinfo->ipi6_ifindex && 1821 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 1822 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 1823 htons(opt->ip6po_pktinfo->ipi6_ifindex); 1824 1825 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 1826 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 1827 return(ENXIO); 1828 } 1829 1830 if (!IN6_IS_ADDR_ANY(&opt->ip6po_pktinfo->ipi6_addr)) { 1831 struct ifaddr *ia; 1832 struct sockaddr_in6 sin6; 1833 1834 bzero(&sin6, sizeof(sin6)); 1835 sin6.sin6_len = sizeof(sin6); 1836 sin6.sin6_family = AF_INET6; 1837 sin6.sin6_addr = 1838 opt->ip6po_pktinfo->ipi6_addr; 1839 ia = ifa_ifwithaddr(sin6tosa(&sin6)); 1840 if (ia == NULL || 1841 (opt->ip6po_pktinfo->ipi6_ifindex && 1842 (ia->ifa_ifp->if_index != 1843 opt->ip6po_pktinfo->ipi6_ifindex))) { 1844 return(EADDRNOTAVAIL); 1845 } 1846 /* 1847 * Check if the requested source address is 1848 * indeed a unicast address assigned to the 1849 * node. 1850 */ 1851 if (IN6_IS_ADDR_MULTICAST(&opt->ip6po_pktinfo->ipi6_addr)) 1852 return(EADDRNOTAVAIL); 1853 } 1854 break; 1855 1856 case IPV6_HOPLIMIT: 1857 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 1858 return(EINVAL); 1859 1860 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 1861 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 1862 return(EINVAL); 1863 break; 1864 1865 case IPV6_NEXTHOP: 1866 if (!priv) 1867 return(EPERM); 1868 if (cm->cmsg_len < sizeof(u_char) || 1869 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 1870 return(EINVAL); 1871 1872 opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); 1873 1874 break; 1875 1876 case IPV6_HOPOPTS: 1877 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 1878 return(EINVAL); 1879 opt->ip6po_hbh = (struct ip6_hbh *)CMSG_DATA(cm); 1880 if (cm->cmsg_len != 1881 CMSG_LEN((opt->ip6po_hbh->ip6h_len + 1) << 3)) 1882 return(EINVAL); 1883 break; 1884 1885 case IPV6_DSTOPTS: 1886 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 1887 return(EINVAL); 1888 1889 /* 1890 * If there is no routing header yet, the destination 1891 * options header should be put on the 1st part. 1892 * Otherwise, the header should be on the 2nd part. 1893 * (See RFC 2460, section 4.1) 1894 */ 1895 if (opt->ip6po_rthdr == NULL) { 1896 opt->ip6po_dest1 = 1897 (struct ip6_dest *)CMSG_DATA(cm); 1898 if (cm->cmsg_len != 1899 CMSG_LEN((opt->ip6po_dest1->ip6d_len + 1) 1900 << 3)) 1901 return(EINVAL); 1902 } 1903 else { 1904 opt->ip6po_dest2 = 1905 (struct ip6_dest *)CMSG_DATA(cm); 1906 if (cm->cmsg_len != 1907 CMSG_LEN((opt->ip6po_dest2->ip6d_len + 1) 1908 << 3)) 1909 return(EINVAL); 1910 } 1911 break; 1912 1913 case IPV6_RTHDR: 1914 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 1915 return(EINVAL); 1916 opt->ip6po_rthdr = (struct ip6_rthdr *)CMSG_DATA(cm); 1917 if (cm->cmsg_len != 1918 CMSG_LEN((opt->ip6po_rthdr->ip6r_len + 1) << 3)) 1919 return(EINVAL); 1920 switch(opt->ip6po_rthdr->ip6r_type) { 1921 case IPV6_RTHDR_TYPE_0: 1922 if (opt->ip6po_rthdr->ip6r_segleft == 0) 1923 return(EINVAL); 1924 break; 1925 default: 1926 return(EINVAL); 1927 } 1928 break; 1929 1930 default: 1931 return(ENOPROTOOPT); 1932 } 1933 } 1934 1935 return(0); 1936 } 1937 1938 /* 1939 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 1940 * packet to the input queue of a specified interface. Note that this 1941 * calls the output routine of the loopback "driver", but with an interface 1942 * pointer that might NOT be &loif -- easier than replicating that code here. 1943 */ 1944 void 1945 ip6_mloopback(ifp, m, dst) 1946 struct ifnet *ifp; 1947 register struct mbuf *m; 1948 register struct sockaddr_in6 *dst; 1949 { 1950 struct mbuf *copym; 1951 1952 copym = m_copy(m, 0, M_COPYALL); 1953 if (copym != NULL) 1954 (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); 1955 } 1956 1957 /* 1958 * Chop IPv6 header off from the payload. 1959 */ 1960 static int 1961 ip6_splithdr(m, exthdrs) 1962 struct mbuf *m; 1963 struct ip6_exthdrs *exthdrs; 1964 { 1965 struct mbuf *mh; 1966 struct ip6_hdr *ip6; 1967 1968 ip6 = mtod(m, struct ip6_hdr *); 1969 if (m->m_len > sizeof(*ip6)) { 1970 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 1971 if (mh == 0) { 1972 m_freem(m); 1973 return ENOBUFS; 1974 } 1975 M_COPY_PKTHDR(mh, m); 1976 MH_ALIGN(mh, sizeof(*ip6)); 1977 m->m_flags &= ~M_PKTHDR; 1978 m->m_len -= sizeof(*ip6); 1979 m->m_data += sizeof(*ip6); 1980 mh->m_next = m; 1981 m = mh; 1982 m->m_len = sizeof(*ip6); 1983 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 1984 } 1985 exthdrs->ip6e_ip6 = m; 1986 return 0; 1987 } 1988 1989 /* 1990 * Compute IPv6 extension header length. 1991 */ 1992 int 1993 ip6_optlen(in6p) 1994 struct in6pcb *in6p; 1995 { 1996 int len; 1997 1998 if (!in6p->in6p_outputopts) 1999 return 0; 2000 2001 len = 0; 2002 #define elen(x) \ 2003 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2004 2005 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2006 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2007 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2008 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2009 return len; 2010 #undef elen 2011 } 2012
Indexes created Wed Oct 01 07:09:59 GMT 2025