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sys/netinet6/ip6_output.c
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1 /* $FreeBSD$ */ 2 /* $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 66 */ 67 68 #include "opt_ip6fw.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/errno.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/systm.h> 81 #include <sys/kernel.h> 82 #include <sys/proc.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet6/in6_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet6/nd6.h> 95 #include <netinet6/ip6protosw.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #ifdef INET6 100 #include <netinet6/ipsec6.h> 101 #endif 102 #include <netkey/key.h> 103 #endif /* IPSEC */ 104 105 #ifdef FAST_IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec6.h> 108 #include <netipsec/key.h> 109 #endif /* FAST_IPSEC */ 110 111 #include <netinet6/ip6_fw.h> 112 113 #include <net/net_osdep.h> 114 115 extern int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)); 116 117 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 118 119 struct ip6_exthdrs { 120 struct mbuf *ip6e_ip6; 121 struct mbuf *ip6e_hbh; 122 struct mbuf *ip6e_dest1; 123 struct mbuf *ip6e_rthdr; 124 struct mbuf *ip6e_dest2; 125 }; 126 127 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 128 struct socket *, struct sockopt *sopt)); 129 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 130 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 131 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 132 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 133 struct ip6_frag **)); 134 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 135 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 136 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 137 struct ifnet *, struct in6_addr *, u_long *, int *)); 138 139 /* 140 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 141 * header (with pri, len, nxt, hlim, src, dst). 142 * This function may modify ver and hlim only. 143 * The mbuf chain containing the packet will be freed. 144 * The mbuf opt, if present, will not be freed. 145 * 146 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 147 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 148 * which is rt_rmx.rmx_mtu. 149 */ 150 int 151 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 152 struct mbuf *m0; 153 struct ip6_pktopts *opt; 154 struct route_in6 *ro; 155 int flags; 156 struct ip6_moptions *im6o; 157 struct ifnet **ifpp; /* XXX: just for statistics */ 158 struct inpcb *inp; 159 { 160 struct ip6_hdr *ip6, *mhip6; 161 struct ifnet *ifp, *origifp; 162 struct mbuf *m = m0; 163 int hlen, tlen, len, off; 164 struct route_in6 ip6route; 165 struct sockaddr_in6 *dst; 166 int error = 0; 167 struct in6_ifaddr *ia = NULL; 168 u_long mtu; 169 int alwaysfrag, dontfrag; 170 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 171 struct ip6_exthdrs exthdrs; 172 struct in6_addr finaldst; 173 struct route_in6 *ro_pmtu = NULL; 174 int hdrsplit = 0; 175 int needipsec = 0; 176 #ifdef IPSEC 177 int needipsectun = 0; 178 struct secpolicy *sp = NULL; 179 struct socket *so = inp ? inp->inp_socket : NULL; 180 181 ip6 = mtod(m, struct ip6_hdr *); 182 #endif /* IPSEC */ 183 #ifdef FAST_IPSEC 184 int needipsectun = 0; 185 struct secpolicy *sp = NULL; 186 187 ip6 = mtod(m, struct ip6_hdr *); 188 #endif /* FAST_IPSEC */ 189 190 #define MAKE_EXTHDR(hp, mp) \ 191 do { \ 192 if (hp) { \ 193 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 194 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 195 ((eh)->ip6e_len + 1) << 3); \ 196 if (error) \ 197 goto freehdrs; \ 198 } \ 199 } while (0) 200 201 bzero(&exthdrs, sizeof(exthdrs)); 202 203 if (opt) { 204 /* Hop-by-Hop options header */ 205 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 206 /* Destination options header(1st part) */ 207 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 208 /* Routing header */ 209 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 210 /* Destination options header(2nd part) */ 211 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 212 } 213 214 #ifdef IPSEC 215 /* get a security policy for this packet */ 216 if (so == NULL) 217 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 218 else 219 sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); 220 221 if (sp == NULL) { 222 ipsec6stat.out_inval++; 223 goto freehdrs; 224 } 225 226 error = 0; 227 228 /* check policy */ 229 switch (sp->policy) { 230 case IPSEC_POLICY_DISCARD: 231 /* 232 * This packet is just discarded. 233 */ 234 ipsec6stat.out_polvio++; 235 goto freehdrs; 236 237 case IPSEC_POLICY_BYPASS: 238 case IPSEC_POLICY_NONE: 239 /* no need to do IPsec. */ 240 needipsec = 0; 241 break; 242 243 case IPSEC_POLICY_IPSEC: 244 if (sp->req == NULL) { 245 /* acquire a policy */ 246 error = key_spdacquire(sp); 247 goto freehdrs; 248 } 249 needipsec = 1; 250 break; 251 252 case IPSEC_POLICY_ENTRUST: 253 default: 254 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 255 } 256 #endif /* IPSEC */ 257 #ifdef FAST_IPSEC 258 /* get a security policy for this packet */ 259 if (inp == NULL) 260 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 261 else 262 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 263 264 if (sp == NULL) { 265 newipsecstat.ips_out_inval++; 266 goto freehdrs; 267 } 268 269 error = 0; 270 271 /* check policy */ 272 switch (sp->policy) { 273 case IPSEC_POLICY_DISCARD: 274 /* 275 * This packet is just discarded. 276 */ 277 newipsecstat.ips_out_polvio++; 278 goto freehdrs; 279 280 case IPSEC_POLICY_BYPASS: 281 case IPSEC_POLICY_NONE: 282 /* no need to do IPsec. */ 283 needipsec = 0; 284 break; 285 286 case IPSEC_POLICY_IPSEC: 287 if (sp->req == NULL) { 288 /* acquire a policy */ 289 error = key_spdacquire(sp); 290 goto freehdrs; 291 } 292 needipsec = 1; 293 break; 294 295 case IPSEC_POLICY_ENTRUST: 296 default: 297 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 298 } 299 #endif /* FAST_IPSEC */ 300 301 /* 302 * Calculate the total length of the extension header chain. 303 * Keep the length of the unfragmentable part for fragmentation. 304 */ 305 optlen = 0; 306 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 307 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 308 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 309 unfragpartlen = optlen + sizeof(struct ip6_hdr); 310 /* NOTE: we don't add AH/ESP length here. do that later. */ 311 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 312 313 /* 314 * If we need IPsec, or there is at least one extension header, 315 * separate IP6 header from the payload. 316 */ 317 if ((needipsec || optlen) && !hdrsplit) { 318 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 319 m = NULL; 320 goto freehdrs; 321 } 322 m = exthdrs.ip6e_ip6; 323 hdrsplit++; 324 } 325 326 /* adjust pointer */ 327 ip6 = mtod(m, struct ip6_hdr *); 328 329 /* adjust mbuf packet header length */ 330 m->m_pkthdr.len += optlen; 331 plen = m->m_pkthdr.len - sizeof(*ip6); 332 333 /* If this is a jumbo payload, insert a jumbo payload option. */ 334 if (plen > IPV6_MAXPACKET) { 335 if (!hdrsplit) { 336 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 337 m = NULL; 338 goto freehdrs; 339 } 340 m = exthdrs.ip6e_ip6; 341 hdrsplit++; 342 } 343 /* adjust pointer */ 344 ip6 = mtod(m, struct ip6_hdr *); 345 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 346 goto freehdrs; 347 ip6->ip6_plen = 0; 348 } else 349 ip6->ip6_plen = htons(plen); 350 351 /* 352 * Concatenate headers and fill in next header fields. 353 * Here we have, on "m" 354 * IPv6 payload 355 * and we insert headers accordingly. Finally, we should be getting: 356 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 357 * 358 * during the header composing process, "m" points to IPv6 header. 359 * "mprev" points to an extension header prior to esp. 360 */ 361 { 362 u_char *nexthdrp = &ip6->ip6_nxt; 363 struct mbuf *mprev = m; 364 365 /* 366 * we treat dest2 specially. this makes IPsec processing 367 * much easier. the goal here is to make mprev point the 368 * mbuf prior to dest2. 369 * 370 * result: IPv6 dest2 payload 371 * m and mprev will point to IPv6 header. 372 */ 373 if (exthdrs.ip6e_dest2) { 374 if (!hdrsplit) 375 panic("assumption failed: hdr not split"); 376 exthdrs.ip6e_dest2->m_next = m->m_next; 377 m->m_next = exthdrs.ip6e_dest2; 378 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 379 ip6->ip6_nxt = IPPROTO_DSTOPTS; 380 } 381 382 #define MAKE_CHAIN(m, mp, p, i)\ 383 do {\ 384 if (m) {\ 385 if (!hdrsplit) \ 386 panic("assumption failed: hdr not split"); \ 387 *mtod((m), u_char *) = *(p);\ 388 *(p) = (i);\ 389 p = mtod((m), u_char *);\ 390 (m)->m_next = (mp)->m_next;\ 391 (mp)->m_next = (m);\ 392 (mp) = (m);\ 393 }\ 394 } while (0) 395 /* 396 * result: IPv6 hbh dest1 rthdr dest2 payload 397 * m will point to IPv6 header. mprev will point to the 398 * extension header prior to dest2 (rthdr in the above case). 399 */ 400 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, 401 nexthdrp, IPPROTO_HOPOPTS); 402 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, 403 nexthdrp, IPPROTO_DSTOPTS); 404 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, 405 nexthdrp, IPPROTO_ROUTING); 406 407 #if defined(IPSEC) || defined(FAST_IPSEC) 408 if (!needipsec) 409 goto skip_ipsec2; 410 411 /* 412 * pointers after IPsec headers are not valid any more. 413 * other pointers need a great care too. 414 * (IPsec routines should not mangle mbufs prior to AH/ESP) 415 */ 416 exthdrs.ip6e_dest2 = NULL; 417 418 { 419 struct ip6_rthdr *rh = NULL; 420 int segleft_org = 0; 421 struct ipsec_output_state state; 422 423 if (exthdrs.ip6e_rthdr) { 424 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 425 segleft_org = rh->ip6r_segleft; 426 rh->ip6r_segleft = 0; 427 } 428 429 bzero(&state, sizeof(state)); 430 state.m = m; 431 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 432 &needipsectun); 433 m = state.m; 434 if (error) { 435 /* mbuf is already reclaimed in ipsec6_output_trans. */ 436 m = NULL; 437 switch (error) { 438 case EHOSTUNREACH: 439 case ENETUNREACH: 440 case EMSGSIZE: 441 case ENOBUFS: 442 case ENOMEM: 443 break; 444 default: 445 printf("ip6_output (ipsec): error code %d\n", error); 446 /* fall through */ 447 case ENOENT: 448 /* don't show these error codes to the user */ 449 error = 0; 450 break; 451 } 452 goto bad; 453 } 454 if (exthdrs.ip6e_rthdr) { 455 /* ah6_output doesn't modify mbuf chain */ 456 rh->ip6r_segleft = segleft_org; 457 } 458 } 459 skip_ipsec2:; 460 #endif 461 } 462 463 /* 464 * If there is a routing header, replace destination address field 465 * with the first hop of the routing header. 466 */ 467 if (exthdrs.ip6e_rthdr) { 468 struct ip6_rthdr *rh = 469 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 470 struct ip6_rthdr *)); 471 struct ip6_rthdr0 *rh0; 472 473 finaldst = ip6->ip6_dst; 474 switch (rh->ip6r_type) { 475 case IPV6_RTHDR_TYPE_0: 476 rh0 = (struct ip6_rthdr0 *)rh; 477 ip6->ip6_dst = rh0->ip6r0_addr[0]; 478 bcopy((caddr_t)&rh0->ip6r0_addr[1], 479 (caddr_t)&rh0->ip6r0_addr[0], 480 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 481 ); 482 rh0->ip6r0_addr[rh0->ip6r0_segleft - 1] = finaldst; 483 break; 484 default: /* is it possible? */ 485 error = EINVAL; 486 goto bad; 487 } 488 } 489 490 /* Source address validation */ 491 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 492 (flags & IPV6_DADOUTPUT) == 0) { 493 error = EOPNOTSUPP; 494 ip6stat.ip6s_badscope++; 495 goto bad; 496 } 497 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 498 error = EOPNOTSUPP; 499 ip6stat.ip6s_badscope++; 500 goto bad; 501 } 502 503 ip6stat.ip6s_localout++; 504 505 /* 506 * Route packet. 507 */ 508 if (ro == 0) { 509 ro = &ip6route; 510 bzero((caddr_t)ro, sizeof(*ro)); 511 } 512 ro_pmtu = ro; 513 if (opt && opt->ip6po_rthdr) 514 ro = &opt->ip6po_route; 515 dst = (struct sockaddr_in6 *)&ro->ro_dst; 516 /* 517 * If there is a cached route, 518 * check that it is to the same destination 519 * and is still up. If not, free it and try again. 520 */ 521 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 522 dst->sin6_family != AF_INET6 || 523 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 524 RTFREE(ro->ro_rt); 525 ro->ro_rt = (struct rtentry *)0; 526 } 527 if (ro->ro_rt == 0) { 528 bzero(dst, sizeof(*dst)); 529 dst->sin6_family = AF_INET6; 530 dst->sin6_len = sizeof(struct sockaddr_in6); 531 dst->sin6_addr = ip6->ip6_dst; 532 #ifdef SCOPEDROUTING 533 /* XXX: sin6_scope_id should already be fixed at this point */ 534 if (IN6_IS_SCOPE_LINKLOCAL(&dst->sin6_addr)) 535 dst->sin6_scope_id = ntohs(dst->sin6_addr.s6_addr16[1]); 536 #endif 537 } 538 #if defined(IPSEC) || defined(FAST_IPSEC) 539 if (needipsec && needipsectun) { 540 struct ipsec_output_state state; 541 542 /* 543 * All the extension headers will become inaccessible 544 * (since they can be encrypted). 545 * Don't panic, we need no more updates to extension headers 546 * on inner IPv6 packet (since they are now encapsulated). 547 * 548 * IPv6 [ESP|AH] IPv6 [extension headers] payload 549 */ 550 bzero(&exthdrs, sizeof(exthdrs)); 551 exthdrs.ip6e_ip6 = m; 552 553 bzero(&state, sizeof(state)); 554 state.m = m; 555 state.ro = (struct route *)ro; 556 state.dst = (struct sockaddr *)dst; 557 558 error = ipsec6_output_tunnel(&state, sp, flags); 559 560 m = state.m; 561 ro = (struct route_in6 *)state.ro; 562 dst = (struct sockaddr_in6 *)state.dst; 563 if (error) { 564 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 565 m0 = m = NULL; 566 m = NULL; 567 switch (error) { 568 case EHOSTUNREACH: 569 case ENETUNREACH: 570 case EMSGSIZE: 571 case ENOBUFS: 572 case ENOMEM: 573 break; 574 default: 575 printf("ip6_output (ipsec): error code %d\n", error); 576 /* fall through */ 577 case ENOENT: 578 /* don't show these error codes to the user */ 579 error = 0; 580 break; 581 } 582 goto bad; 583 } 584 585 exthdrs.ip6e_ip6 = m; 586 } 587 #endif /* IPSEC */ 588 589 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 590 /* Unicast */ 591 592 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 593 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 594 /* xxx 595 * interface selection comes here 596 * if an interface is specified from an upper layer, 597 * ifp must point it. 598 */ 599 if (ro->ro_rt == 0) { 600 /* 601 * non-bsdi always clone routes, if parent is 602 * PRF_CLONING. 603 */ 604 rtalloc((struct route *)ro); 605 } 606 if (ro->ro_rt == 0) { 607 ip6stat.ip6s_noroute++; 608 error = EHOSTUNREACH; 609 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 610 goto bad; 611 } 612 ia = ifatoia6(ro->ro_rt->rt_ifa); 613 ifp = ro->ro_rt->rt_ifp; 614 ro->ro_rt->rt_use++; 615 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 616 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 617 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 618 619 in6_ifstat_inc(ifp, ifs6_out_request); 620 621 /* 622 * Check if the outgoing interface conflicts with 623 * the interface specified by ifi6_ifindex (if specified). 624 * Note that loopback interface is always okay. 625 * (this may happen when we are sending a packet to one of 626 * our own addresses.) 627 */ 628 if (opt && opt->ip6po_pktinfo 629 && opt->ip6po_pktinfo->ipi6_ifindex) { 630 if (!(ifp->if_flags & IFF_LOOPBACK) 631 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 632 ip6stat.ip6s_noroute++; 633 in6_ifstat_inc(ifp, ifs6_out_discard); 634 error = EHOSTUNREACH; 635 goto bad; 636 } 637 } 638 639 if (opt && opt->ip6po_hlim != -1) 640 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 641 } else { 642 /* Multicast */ 643 struct in6_multi *in6m; 644 645 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 646 647 /* 648 * See if the caller provided any multicast options 649 */ 650 ifp = NULL; 651 if (im6o != NULL) { 652 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 653 if (im6o->im6o_multicast_ifp != NULL) 654 ifp = im6o->im6o_multicast_ifp; 655 } else 656 ip6->ip6_hlim = ip6_defmcasthlim; 657 658 /* 659 * See if the caller provided the outgoing interface 660 * as an ancillary data. 661 * Boundary check for ifindex is assumed to be already done. 662 */ 663 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 664 ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; 665 666 /* 667 * If the destination is a node-local scope multicast, 668 * the packet should be loop-backed only. 669 */ 670 if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { 671 /* 672 * If the outgoing interface is already specified, 673 * it should be a loopback interface. 674 */ 675 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 676 ip6stat.ip6s_badscope++; 677 error = ENETUNREACH; /* XXX: better error? */ 678 /* XXX correct ifp? */ 679 in6_ifstat_inc(ifp, ifs6_out_discard); 680 goto bad; 681 } else { 682 ifp = &loif[0]; 683 } 684 } 685 686 if (opt && opt->ip6po_hlim != -1) 687 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 688 689 /* 690 * If caller did not provide an interface lookup a 691 * default in the routing table. This is either a 692 * default for the speicfied group (i.e. a host 693 * route), or a multicast default (a route for the 694 * ``net'' ff00::/8). 695 */ 696 if (ifp == NULL) { 697 if (ro->ro_rt == 0) { 698 ro->ro_rt = rtalloc1((struct sockaddr *) 699 &ro->ro_dst, 0, 0UL); 700 } 701 if (ro->ro_rt == 0) { 702 ip6stat.ip6s_noroute++; 703 error = EHOSTUNREACH; 704 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 705 goto bad; 706 } 707 ia = ifatoia6(ro->ro_rt->rt_ifa); 708 ifp = ro->ro_rt->rt_ifp; 709 ro->ro_rt->rt_use++; 710 } 711 712 if ((flags & IPV6_FORWARDING) == 0) 713 in6_ifstat_inc(ifp, ifs6_out_request); 714 in6_ifstat_inc(ifp, ifs6_out_mcast); 715 716 /* 717 * Confirm that the outgoing interface supports multicast. 718 */ 719 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 720 ip6stat.ip6s_noroute++; 721 in6_ifstat_inc(ifp, ifs6_out_discard); 722 error = ENETUNREACH; 723 goto bad; 724 } 725 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 726 if (in6m != NULL && 727 (im6o == NULL || im6o->im6o_multicast_loop)) { 728 /* 729 * If we belong to the destination multicast group 730 * on the outgoing interface, and the caller did not 731 * forbid loopback, loop back a copy. 732 */ 733 ip6_mloopback(ifp, m, dst); 734 } else { 735 /* 736 * If we are acting as a multicast router, perform 737 * multicast forwarding as if the packet had just 738 * arrived on the interface to which we are about 739 * to send. The multicast forwarding function 740 * recursively calls this function, using the 741 * IPV6_FORWARDING flag to prevent infinite recursion. 742 * 743 * Multicasts that are looped back by ip6_mloopback(), 744 * above, will be forwarded by the ip6_input() routine, 745 * if necessary. 746 */ 747 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 748 if (ip6_mforward(ip6, ifp, m) != 0) { 749 m_freem(m); 750 goto done; 751 } 752 } 753 } 754 /* 755 * Multicasts with a hoplimit of zero may be looped back, 756 * above, but must not be transmitted on a network. 757 * Also, multicasts addressed to the loopback interface 758 * are not sent -- the above call to ip6_mloopback() will 759 * loop back a copy if this host actually belongs to the 760 * destination group on the loopback interface. 761 */ 762 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { 763 m_freem(m); 764 goto done; 765 } 766 } 767 768 /* 769 * Fill the outgoing inteface to tell the upper layer 770 * to increment per-interface statistics. 771 */ 772 if (ifpp) 773 *ifpp = ifp; 774 775 /* Determine path MTU. */ 776 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 777 &alwaysfrag)) != 0) 778 goto bad; 779 780 /* 781 * The caller of this function may specify to use the minimum MTU 782 * in some cases. 783 */ 784 if (mtu > IPV6_MMTU) { 785 if ((flags & IPV6_MINMTU)) 786 mtu = IPV6_MMTU; 787 } 788 789 /* Fake scoped addresses */ 790 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 791 /* 792 * If source or destination address is a scoped address, and 793 * the packet is going to be sent to a loopback interface, 794 * we should keep the original interface. 795 */ 796 797 /* 798 * XXX: this is a very experimental and temporary solution. 799 * We eventually have sockaddr_in6 and use the sin6_scope_id 800 * field of the structure here. 801 * We rely on the consistency between two scope zone ids 802 * of source and destination, which should already be assured. 803 * Larger scopes than link will be supported in the future. 804 */ 805 origifp = NULL; 806 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 807 origifp = ifindex2ifnet[ntohs(ip6->ip6_src.s6_addr16[1])]; 808 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 809 origifp = ifindex2ifnet[ntohs(ip6->ip6_dst.s6_addr16[1])]; 810 /* 811 * XXX: origifp can be NULL even in those two cases above. 812 * For example, if we remove the (only) link-local address 813 * from the loopback interface, and try to send a link-local 814 * address without link-id information. Then the source 815 * address is ::1, and the destination address is the 816 * link-local address with its s6_addr16[1] being zero. 817 * What is worse, if the packet goes to the loopback interface 818 * by a default rejected route, the null pointer would be 819 * passed to looutput, and the kernel would hang. 820 * The following last resort would prevent such disaster. 821 */ 822 if (origifp == NULL) 823 origifp = ifp; 824 } 825 else 826 origifp = ifp; 827 #ifndef SCOPEDROUTING 828 /* 829 * clear embedded scope identifiers if necessary. 830 * in6_clearscope will touch the addresses only when necessary. 831 */ 832 in6_clearscope(&ip6->ip6_src); 833 in6_clearscope(&ip6->ip6_dst); 834 #endif 835 836 /* 837 * Check with the firewall... 838 */ 839 if (ip6_fw_enable && ip6_fw_chk_ptr) { 840 u_short port = 0; 841 m->m_pkthdr.rcvif = NULL; /* XXX */ 842 /* If ipfw says divert, we have to just drop packet */ 843 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 844 m_freem(m); 845 goto done; 846 } 847 if (!m) { 848 error = EACCES; 849 goto done; 850 } 851 } 852 853 /* 854 * If the outgoing packet contains a hop-by-hop options header, 855 * it must be examined and processed even by the source node. 856 * (RFC 2460, section 4.) 857 */ 858 if (exthdrs.ip6e_hbh) { 859 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 860 u_int32_t dummy1; /* XXX unused */ 861 u_int32_t dummy2; /* XXX unused */ 862 863 #ifdef DIAGNOSTIC 864 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 865 panic("ip6e_hbh is not continuous"); 866 #endif 867 /* 868 * XXX: if we have to send an ICMPv6 error to the sender, 869 * we need the M_LOOP flag since icmp6_error() expects 870 * the IPv6 and the hop-by-hop options header are 871 * continuous unless the flag is set. 872 */ 873 m->m_flags |= M_LOOP; 874 m->m_pkthdr.rcvif = ifp; 875 if (ip6_process_hopopts(m, 876 (u_int8_t *)(hbh + 1), 877 ((hbh->ip6h_len + 1) << 3) - 878 sizeof(struct ip6_hbh), 879 &dummy1, &dummy2) < 0) { 880 /* m was already freed at this point */ 881 error = EINVAL;/* better error? */ 882 goto done; 883 } 884 m->m_flags &= ~M_LOOP; /* XXX */ 885 m->m_pkthdr.rcvif = NULL; 886 } 887 888 /* 889 * Check if we want to allow this packet to be processed. 890 * Consider it to be bad if not. 891 */ 892 if (fr_checkp) { 893 struct mbuf *m1 = m; 894 895 if ((*fr_checkp)((struct ip *)ip6, sizeof(*ip6), ifp, 1, &m1)) 896 goto done; 897 m = m1; 898 if (m == NULL) 899 goto done; 900 ip6 = mtod(m, struct ip6_hdr *); 901 } 902 903 /* 904 * Send the packet to the outgoing interface. 905 * If necessary, do IPv6 fragmentation before sending. 906 * 907 * the logic here is rather complex: 908 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 909 * 1-a: send as is if tlen <= path mtu 910 * 1-b: fragment if tlen > path mtu 911 * 912 * 2: if user asks us not to fragment (dontfrag == 1) 913 * 2-a: send as is if tlen <= interface mtu 914 * 2-b: error if tlen > interface mtu 915 * 916 * 3: if we always need to attach fragment header (alwaysfrag == 1) 917 * always fragment 918 * 919 * 4: if dontfrag == 1 && alwaysfrag == 1 920 * error, as we cannot handle this conflicting request 921 */ 922 tlen = m->m_pkthdr.len; 923 924 dontfrag = 0; 925 if (dontfrag && alwaysfrag) { /* case 4 */ 926 /* conflicting request - can't transmit */ 927 error = EMSGSIZE; 928 goto bad; 929 } 930 if (dontfrag && tlen > nd_ifinfo[ifp->if_index].linkmtu) { /* case 2-b */ 931 /* 932 * Even if the DONTFRAG option is specified, we cannot send the 933 * packet when the data length is larger than the MTU of the 934 * outgoing interface. 935 * Notify the error by sending IPV6_PATHMTU ancillary data as 936 * well as returning an error code (the latter is not described 937 * in the API spec.) 938 */ 939 u_int32_t mtu32; 940 struct ip6ctlparam ip6cp; 941 942 mtu32 = (u_int32_t)mtu; 943 bzero(&ip6cp, sizeof(ip6cp)); 944 ip6cp.ip6c_cmdarg = (void *)&mtu32; 945 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 946 (void *)&ip6cp); 947 948 error = EMSGSIZE; 949 goto bad; 950 } 951 952 /* 953 * transmit packet without fragmentation 954 */ 955 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 956 struct in6_ifaddr *ia6; 957 958 ip6 = mtod(m, struct ip6_hdr *); 959 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 960 if (ia6) { 961 /* Record statistics for this interface address. */ 962 ia6->ia_ifa.if_opackets++; 963 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 964 } 965 #ifdef IPSEC 966 /* clean ipsec history once it goes out of the node */ 967 ipsec_delaux(m); 968 #endif 969 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 970 goto done; 971 } 972 973 /* 974 * try to fragment the packet. case 1-b and 3 975 */ 976 if (mtu < IPV6_MMTU) { 977 /* path MTU cannot be less than IPV6_MMTU */ 978 error = EMSGSIZE; 979 in6_ifstat_inc(ifp, ifs6_out_fragfail); 980 goto bad; 981 } else if (ip6->ip6_plen == 0) { 982 /* jumbo payload cannot be fragmented */ 983 error = EMSGSIZE; 984 in6_ifstat_inc(ifp, ifs6_out_fragfail); 985 goto bad; 986 } else { 987 struct mbuf **mnext, *m_frgpart; 988 struct ip6_frag *ip6f; 989 u_int32_t id = htonl(ip6_id++); 990 u_char nextproto; 991 struct ip6ctlparam ip6cp; 992 u_int32_t mtu32; 993 994 /* 995 * Too large for the destination or interface; 996 * fragment if possible. 997 * Must be able to put at least 8 bytes per fragment. 998 */ 999 hlen = unfragpartlen; 1000 if (mtu > IPV6_MAXPACKET) 1001 mtu = IPV6_MAXPACKET; 1002 1003 /* Notify a proper path MTU to applications. */ 1004 mtu32 = (u_int32_t)mtu; 1005 bzero(&ip6cp, sizeof(ip6cp)); 1006 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1007 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1008 (void *)&ip6cp); 1009 1010 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1011 if (len < 8) { 1012 error = EMSGSIZE; 1013 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1014 goto bad; 1015 } 1016 1017 mnext = &m->m_nextpkt; 1018 1019 /* 1020 * Change the next header field of the last header in the 1021 * unfragmentable part. 1022 */ 1023 if (exthdrs.ip6e_rthdr) { 1024 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1025 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1026 } else if (exthdrs.ip6e_dest1) { 1027 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1028 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1029 } else if (exthdrs.ip6e_hbh) { 1030 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1031 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1032 } else { 1033 nextproto = ip6->ip6_nxt; 1034 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1035 } 1036 1037 /* 1038 * Loop through length of segment after first fragment, 1039 * make new header and copy data of each part and link onto 1040 * chain. 1041 */ 1042 m0 = m; 1043 for (off = hlen; off < tlen; off += len) { 1044 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1045 if (!m) { 1046 error = ENOBUFS; 1047 ip6stat.ip6s_odropped++; 1048 goto sendorfree; 1049 } 1050 m->m_pkthdr.rcvif = NULL; 1051 m->m_flags = m0->m_flags & M_COPYFLAGS; 1052 *mnext = m; 1053 mnext = &m->m_nextpkt; 1054 m->m_data += max_linkhdr; 1055 mhip6 = mtod(m, struct ip6_hdr *); 1056 *mhip6 = *ip6; 1057 m->m_len = sizeof(*mhip6); 1058 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1059 if (error) { 1060 ip6stat.ip6s_odropped++; 1061 goto sendorfree; 1062 } 1063 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1064 if (off + len >= tlen) 1065 len = tlen - off; 1066 else 1067 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1068 mhip6->ip6_plen = htons((u_short)(len + hlen + 1069 sizeof(*ip6f) - 1070 sizeof(struct ip6_hdr))); 1071 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1072 error = ENOBUFS; 1073 ip6stat.ip6s_odropped++; 1074 goto sendorfree; 1075 } 1076 m_cat(m, m_frgpart); 1077 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1078 m->m_pkthdr.rcvif = (struct ifnet *)0; 1079 ip6f->ip6f_reserved = 0; 1080 ip6f->ip6f_ident = id; 1081 ip6f->ip6f_nxt = nextproto; 1082 ip6stat.ip6s_ofragments++; 1083 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1084 } 1085 1086 in6_ifstat_inc(ifp, ifs6_out_fragok); 1087 } 1088 1089 /* 1090 * Remove leading garbages. 1091 */ 1092 sendorfree: 1093 m = m0->m_nextpkt; 1094 m0->m_nextpkt = 0; 1095 m_freem(m0); 1096 for (m0 = m; m; m = m0) { 1097 m0 = m->m_nextpkt; 1098 m->m_nextpkt = 0; 1099 if (error == 0) { 1100 /* Record statistics for this interface address. */ 1101 if (ia) { 1102 ia->ia_ifa.if_opackets++; 1103 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1104 } 1105 #ifdef IPSEC 1106 /* clean ipsec history once it goes out of the node */ 1107 ipsec_delaux(m); 1108 #endif 1109 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1110 } else 1111 m_freem(m); 1112 } 1113 1114 if (error == 0) 1115 ip6stat.ip6s_fragmented++; 1116 1117 done: 1118 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1119 RTFREE(ro->ro_rt); 1120 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1121 RTFREE(ro_pmtu->ro_rt); 1122 } 1123 1124 #ifdef IPSEC 1125 if (sp != NULL) 1126 key_freesp(sp); 1127 #endif /* IPSEC */ 1128 #ifdef FAST_IPSEC 1129 if (sp != NULL) 1130 KEY_FREESP(&sp); 1131 #endif /* FAST_IPSEC */ 1132 1133 return(error); 1134 1135 freehdrs: 1136 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1137 m_freem(exthdrs.ip6e_dest1); 1138 m_freem(exthdrs.ip6e_rthdr); 1139 m_freem(exthdrs.ip6e_dest2); 1140 /* fall through */ 1141 bad: 1142 m_freem(m); 1143 goto done; 1144 } 1145 1146 static int 1147 ip6_copyexthdr(mp, hdr, hlen) 1148 struct mbuf **mp; 1149 caddr_t hdr; 1150 int hlen; 1151 { 1152 struct mbuf *m; 1153 1154 if (hlen > MCLBYTES) 1155 return(ENOBUFS); /* XXX */ 1156 1157 MGET(m, M_DONTWAIT, MT_DATA); 1158 if (!m) 1159 return(ENOBUFS); 1160 1161 if (hlen > MLEN) { 1162 MCLGET(m, M_DONTWAIT); 1163 if ((m->m_flags & M_EXT) == 0) { 1164 m_free(m); 1165 return(ENOBUFS); 1166 } 1167 } 1168 m->m_len = hlen; 1169 if (hdr) 1170 bcopy(hdr, mtod(m, caddr_t), hlen); 1171 1172 *mp = m; 1173 return(0); 1174 } 1175 1176 /* 1177 * Insert jumbo payload option. 1178 */ 1179 static int 1180 ip6_insert_jumboopt(exthdrs, plen) 1181 struct ip6_exthdrs *exthdrs; 1182 u_int32_t plen; 1183 { 1184 struct mbuf *mopt; 1185 u_char *optbuf; 1186 u_int32_t v; 1187 1188 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1189 1190 /* 1191 * If there is no hop-by-hop options header, allocate new one. 1192 * If there is one but it doesn't have enough space to store the 1193 * jumbo payload option, allocate a cluster to store the whole options. 1194 * Otherwise, use it to store the options. 1195 */ 1196 if (exthdrs->ip6e_hbh == 0) { 1197 MGET(mopt, M_DONTWAIT, MT_DATA); 1198 if (mopt == 0) 1199 return(ENOBUFS); 1200 mopt->m_len = JUMBOOPTLEN; 1201 optbuf = mtod(mopt, u_char *); 1202 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1203 exthdrs->ip6e_hbh = mopt; 1204 } else { 1205 struct ip6_hbh *hbh; 1206 1207 mopt = exthdrs->ip6e_hbh; 1208 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1209 /* 1210 * XXX assumption: 1211 * - exthdrs->ip6e_hbh is not referenced from places 1212 * other than exthdrs. 1213 * - exthdrs->ip6e_hbh is not an mbuf chain. 1214 */ 1215 int oldoptlen = mopt->m_len; 1216 struct mbuf *n; 1217 1218 /* 1219 * XXX: give up if the whole (new) hbh header does 1220 * not fit even in an mbuf cluster. 1221 */ 1222 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1223 return(ENOBUFS); 1224 1225 /* 1226 * As a consequence, we must always prepare a cluster 1227 * at this point. 1228 */ 1229 MGET(n, M_DONTWAIT, MT_DATA); 1230 if (n) { 1231 MCLGET(n, M_DONTWAIT); 1232 if ((n->m_flags & M_EXT) == 0) { 1233 m_freem(n); 1234 n = NULL; 1235 } 1236 } 1237 if (!n) 1238 return(ENOBUFS); 1239 n->m_len = oldoptlen + JUMBOOPTLEN; 1240 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1241 oldoptlen); 1242 optbuf = mtod(n, caddr_t) + oldoptlen; 1243 m_freem(mopt); 1244 mopt = exthdrs->ip6e_hbh = n; 1245 } else { 1246 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1247 mopt->m_len += JUMBOOPTLEN; 1248 } 1249 optbuf[0] = IP6OPT_PADN; 1250 optbuf[1] = 1; 1251 1252 /* 1253 * Adjust the header length according to the pad and 1254 * the jumbo payload option. 1255 */ 1256 hbh = mtod(mopt, struct ip6_hbh *); 1257 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1258 } 1259 1260 /* fill in the option. */ 1261 optbuf[2] = IP6OPT_JUMBO; 1262 optbuf[3] = 4; 1263 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1264 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1265 1266 /* finally, adjust the packet header length */ 1267 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1268 1269 return(0); 1270 #undef JUMBOOPTLEN 1271 } 1272 1273 /* 1274 * Insert fragment header and copy unfragmentable header portions. 1275 */ 1276 static int 1277 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1278 struct mbuf *m0, *m; 1279 int hlen; 1280 struct ip6_frag **frghdrp; 1281 { 1282 struct mbuf *n, *mlast; 1283 1284 if (hlen > sizeof(struct ip6_hdr)) { 1285 n = m_copym(m0, sizeof(struct ip6_hdr), 1286 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1287 if (n == 0) 1288 return(ENOBUFS); 1289 m->m_next = n; 1290 } else 1291 n = m; 1292 1293 /* Search for the last mbuf of unfragmentable part. */ 1294 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1295 ; 1296 1297 if ((mlast->m_flags & M_EXT) == 0 && 1298 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1299 /* use the trailing space of the last mbuf for the fragment hdr */ 1300 *frghdrp = 1301 (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); 1302 mlast->m_len += sizeof(struct ip6_frag); 1303 m->m_pkthdr.len += sizeof(struct ip6_frag); 1304 } else { 1305 /* allocate a new mbuf for the fragment header */ 1306 struct mbuf *mfrg; 1307 1308 MGET(mfrg, M_DONTWAIT, MT_DATA); 1309 if (mfrg == 0) 1310 return(ENOBUFS); 1311 mfrg->m_len = sizeof(struct ip6_frag); 1312 *frghdrp = mtod(mfrg, struct ip6_frag *); 1313 mlast->m_next = mfrg; 1314 } 1315 1316 return(0); 1317 } 1318 1319 static int 1320 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1321 struct route_in6 *ro_pmtu, *ro; 1322 struct ifnet *ifp; 1323 struct in6_addr *dst; 1324 u_long *mtup; 1325 int *alwaysfragp; 1326 { 1327 u_int32_t mtu = 0; 1328 int alwaysfrag = 0; 1329 int error = 0; 1330 1331 if (ro_pmtu != ro) { 1332 /* The first hop and the final destination may differ. */ 1333 struct sockaddr_in6 *sa6_dst = 1334 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1335 if (ro_pmtu->ro_rt && 1336 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1337 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1338 RTFREE(ro_pmtu->ro_rt); 1339 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1340 } 1341 if (ro_pmtu->ro_rt == NULL) { 1342 bzero(sa6_dst, sizeof(*sa6_dst)); 1343 sa6_dst->sin6_family = AF_INET6; 1344 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1345 sa6_dst->sin6_addr = *dst; 1346 1347 rtalloc((struct route *)ro_pmtu); 1348 } 1349 } 1350 if (ro_pmtu->ro_rt) { 1351 u_int32_t ifmtu; 1352 1353 if (ifp == NULL) 1354 ifp = ro_pmtu->ro_rt->rt_ifp; 1355 ifmtu = nd_ifinfo[ifp->if_index].linkmtu; 1356 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1357 if (mtu == 0) 1358 mtu = ifmtu; 1359 else if (mtu < IPV6_MMTU) { 1360 /* 1361 * RFC2460 section 5, last paragraph: 1362 * if we record ICMPv6 too big message with 1363 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1364 * or smaller, with fragment header attached. 1365 * (fragment header is needed regardless from the 1366 * packet size, for translators to identify packets) 1367 */ 1368 alwaysfrag = 1; 1369 mtu = IPV6_MMTU; 1370 } else if (mtu > ifmtu) { 1371 /* 1372 * The MTU on the route is larger than the MTU on 1373 * the interface! This shouldn't happen, unless the 1374 * MTU of the interface has been changed after the 1375 * interface was brought up. Change the MTU in the 1376 * route to match the interface MTU (as long as the 1377 * field isn't locked). 1378 */ 1379 mtu = ifmtu; 1380 if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) 1381 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1382 } 1383 } else if (ifp) { 1384 mtu = nd_ifinfo[ifp->if_index].linkmtu; 1385 } else 1386 error = EHOSTUNREACH; /* XXX */ 1387 1388 *mtup = mtu; 1389 if (alwaysfragp) 1390 *alwaysfragp = alwaysfrag; 1391 return (error); 1392 } 1393 1394 /* 1395 * IP6 socket option processing. 1396 */ 1397 int 1398 ip6_ctloutput(so, sopt) 1399 struct socket *so; 1400 struct sockopt *sopt; 1401 { 1402 int privileged; 1403 struct inpcb *in6p = sotoinpcb(so); 1404 int error, optval; 1405 int level, op, optname; 1406 int optlen; 1407 struct proc *p; 1408 1409 if (sopt) { 1410 level = sopt->sopt_level; 1411 op = sopt->sopt_dir; 1412 optname = sopt->sopt_name; 1413 optlen = sopt->sopt_valsize; 1414 p = sopt->sopt_p; 1415 } else { 1416 panic("ip6_ctloutput: arg soopt is NULL"); 1417 } 1418 error = optval = 0; 1419 1420 privileged = (p == 0 || suser(p)) ? 0 : 1; 1421 1422 if (level == IPPROTO_IPV6) { 1423 switch (op) { 1424 1425 case SOPT_SET: 1426 switch (optname) { 1427 case IPV6_PKTOPTIONS: 1428 { 1429 struct mbuf *m; 1430 1431 error = soopt_getm(sopt, &m); /* XXX */ 1432 if (error != NULL) 1433 break; 1434 error = soopt_mcopyin(sopt, m); /* XXX */ 1435 if (error != NULL) 1436 break; 1437 error = ip6_pcbopts(&in6p->in6p_outputopts, 1438 m, so, sopt); 1439 m_freem(m); /* XXX */ 1440 break; 1441 } 1442 1443 /* 1444 * Use of some Hop-by-Hop options or some 1445 * Destination options, might require special 1446 * privilege. That is, normal applications 1447 * (without special privilege) might be forbidden 1448 * from setting certain options in outgoing packets, 1449 * and might never see certain options in received 1450 * packets. [RFC 2292 Section 6] 1451 * KAME specific note: 1452 * KAME prevents non-privileged users from sending or 1453 * receiving ANY hbh/dst options in order to avoid 1454 * overhead of parsing options in the kernel. 1455 */ 1456 case IPV6_UNICAST_HOPS: 1457 case IPV6_CHECKSUM: 1458 case IPV6_FAITH: 1459 1460 case IPV6_V6ONLY: 1461 if (optlen != sizeof(int)) { 1462 error = EINVAL; 1463 break; 1464 } 1465 error = sooptcopyin(sopt, &optval, 1466 sizeof optval, sizeof optval); 1467 if (error) 1468 break; 1469 switch (optname) { 1470 1471 case IPV6_UNICAST_HOPS: 1472 if (optval < -1 || optval >= 256) 1473 error = EINVAL; 1474 else { 1475 /* -1 = kernel default */ 1476 in6p->in6p_hops = optval; 1477 1478 if ((in6p->in6p_vflag & 1479 INP_IPV4) != 0) 1480 in6p->inp_ip_ttl = optval; 1481 } 1482 break; 1483 #define OPTSET(bit) \ 1484 do { \ 1485 if (optval) \ 1486 in6p->in6p_flags |= (bit); \ 1487 else \ 1488 in6p->in6p_flags &= ~(bit); \ 1489 } while (0) 1490 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1491 1492 case IPV6_CHECKSUM: 1493 in6p->in6p_cksum = optval; 1494 break; 1495 1496 case IPV6_FAITH: 1497 OPTSET(IN6P_FAITH); 1498 break; 1499 1500 case IPV6_V6ONLY: 1501 /* 1502 * make setsockopt(IPV6_V6ONLY) 1503 * available only prior to bind(2). 1504 * see ipng mailing list, Jun 22 2001. 1505 */ 1506 if (in6p->in6p_lport || 1507 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) 1508 { 1509 error = EINVAL; 1510 break; 1511 } 1512 OPTSET(IN6P_IPV6_V6ONLY); 1513 if (optval) 1514 in6p->in6p_vflag &= ~INP_IPV4; 1515 else 1516 in6p->in6p_vflag |= INP_IPV4; 1517 break; 1518 } 1519 break; 1520 1521 case IPV6_PKTINFO: 1522 case IPV6_HOPLIMIT: 1523 case IPV6_HOPOPTS: 1524 case IPV6_DSTOPTS: 1525 case IPV6_RTHDR: 1526 /* RFC 2292 */ 1527 if (optlen != sizeof(int)) { 1528 error = EINVAL; 1529 break; 1530 } 1531 error = sooptcopyin(sopt, &optval, 1532 sizeof optval, sizeof optval); 1533 if (error) 1534 break; 1535 switch (optname) { 1536 case IPV6_PKTINFO: 1537 OPTSET(IN6P_PKTINFO); 1538 break; 1539 case IPV6_HOPLIMIT: 1540 OPTSET(IN6P_HOPLIMIT); 1541 break; 1542 case IPV6_HOPOPTS: 1543 /* 1544 * Check super-user privilege. 1545 * See comments for IPV6_RECVHOPOPTS. 1546 */ 1547 if (!privileged) 1548 return(EPERM); 1549 OPTSET(IN6P_HOPOPTS); 1550 break; 1551 case IPV6_DSTOPTS: 1552 if (!privileged) 1553 return(EPERM); 1554 OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1555 break; 1556 case IPV6_RTHDR: 1557 OPTSET(IN6P_RTHDR); 1558 break; 1559 } 1560 break; 1561 #undef OPTSET 1562 1563 case IPV6_MULTICAST_IF: 1564 case IPV6_MULTICAST_HOPS: 1565 case IPV6_MULTICAST_LOOP: 1566 case IPV6_JOIN_GROUP: 1567 case IPV6_LEAVE_GROUP: 1568 { 1569 struct mbuf *m; 1570 if (sopt->sopt_valsize > MLEN) { 1571 error = EMSGSIZE; 1572 break; 1573 } 1574 /* XXX */ 1575 MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); 1576 if (m == 0) { 1577 error = ENOBUFS; 1578 break; 1579 } 1580 m->m_len = sopt->sopt_valsize; 1581 error = sooptcopyin(sopt, mtod(m, char *), 1582 m->m_len, m->m_len); 1583 error = ip6_setmoptions(sopt->sopt_name, 1584 &in6p->in6p_moptions, 1585 m); 1586 (void)m_free(m); 1587 } 1588 break; 1589 1590 case IPV6_PORTRANGE: 1591 error = sooptcopyin(sopt, &optval, 1592 sizeof optval, sizeof optval); 1593 if (error) 1594 break; 1595 1596 switch (optval) { 1597 case IPV6_PORTRANGE_DEFAULT: 1598 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1599 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1600 break; 1601 1602 case IPV6_PORTRANGE_HIGH: 1603 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1604 in6p->in6p_flags |= IN6P_HIGHPORT; 1605 break; 1606 1607 case IPV6_PORTRANGE_LOW: 1608 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1609 in6p->in6p_flags |= IN6P_LOWPORT; 1610 break; 1611 1612 default: 1613 error = EINVAL; 1614 break; 1615 } 1616 break; 1617 1618 #if defined(IPSEC) || defined(FAST_IPSEC) 1619 case IPV6_IPSEC_POLICY: 1620 { 1621 caddr_t req = NULL; 1622 size_t len = 0; 1623 struct mbuf *m; 1624 1625 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1626 break; 1627 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1628 break; 1629 if (m) { 1630 req = mtod(m, caddr_t); 1631 len = m->m_len; 1632 } 1633 error = ipsec6_set_policy(in6p, optname, req, 1634 len, privileged); 1635 m_freem(m); 1636 } 1637 break; 1638 #endif /* KAME IPSEC */ 1639 1640 case IPV6_FW_ADD: 1641 case IPV6_FW_DEL: 1642 case IPV6_FW_FLUSH: 1643 case IPV6_FW_ZERO: 1644 { 1645 struct mbuf *m; 1646 struct mbuf **mp = &m; 1647 1648 if (ip6_fw_ctl_ptr == NULL) 1649 return EINVAL; 1650 /* XXX */ 1651 if ((error = soopt_getm(sopt, &m)) != 0) 1652 break; 1653 /* XXX */ 1654 if ((error = soopt_mcopyin(sopt, m)) != 0) 1655 break; 1656 error = (*ip6_fw_ctl_ptr)(optname, mp); 1657 m = *mp; 1658 } 1659 break; 1660 1661 default: 1662 error = ENOPROTOOPT; 1663 break; 1664 } 1665 break; 1666 1667 case SOPT_GET: 1668 switch (optname) { 1669 1670 case IPV6_PKTOPTIONS: 1671 if (in6p->in6p_options) { 1672 struct mbuf *m; 1673 m = m_copym(in6p->in6p_options, 1674 0, M_COPYALL, M_WAIT); 1675 error = soopt_mcopyout(sopt, m); 1676 if (error == 0) 1677 m_freem(m); 1678 } else 1679 sopt->sopt_valsize = 0; 1680 break; 1681 1682 case IPV6_UNICAST_HOPS: 1683 case IPV6_CHECKSUM: 1684 1685 case IPV6_FAITH: 1686 case IPV6_V6ONLY: 1687 case IPV6_PORTRANGE: 1688 switch (optname) { 1689 1690 case IPV6_UNICAST_HOPS: 1691 optval = in6p->in6p_hops; 1692 break; 1693 1694 case IPV6_CHECKSUM: 1695 optval = in6p->in6p_cksum; 1696 break; 1697 1698 case IPV6_FAITH: 1699 optval = OPTBIT(IN6P_FAITH); 1700 break; 1701 1702 case IPV6_V6ONLY: 1703 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1704 break; 1705 1706 case IPV6_PORTRANGE: 1707 { 1708 int flags; 1709 flags = in6p->in6p_flags; 1710 if (flags & IN6P_HIGHPORT) 1711 optval = IPV6_PORTRANGE_HIGH; 1712 else if (flags & IN6P_LOWPORT) 1713 optval = IPV6_PORTRANGE_LOW; 1714 else 1715 optval = 0; 1716 break; 1717 } 1718 } 1719 error = sooptcopyout(sopt, &optval, 1720 sizeof optval); 1721 break; 1722 1723 case IPV6_PKTINFO: 1724 case IPV6_HOPLIMIT: 1725 case IPV6_HOPOPTS: 1726 case IPV6_RTHDR: 1727 case IPV6_DSTOPTS: 1728 if (optname == IPV6_HOPOPTS || 1729 optname == IPV6_DSTOPTS || 1730 !privileged) 1731 return(EPERM); 1732 switch (optname) { 1733 case IPV6_PKTINFO: 1734 optval = OPTBIT(IN6P_PKTINFO); 1735 break; 1736 case IPV6_HOPLIMIT: 1737 optval = OPTBIT(IN6P_HOPLIMIT); 1738 break; 1739 case IPV6_HOPOPTS: 1740 if (!privileged) 1741 return(EPERM); 1742 optval = OPTBIT(IN6P_HOPOPTS); 1743 break; 1744 case IPV6_RTHDR: 1745 optval = OPTBIT(IN6P_RTHDR); 1746 break; 1747 case IPV6_DSTOPTS: 1748 if (!privileged) 1749 return(EPERM); 1750 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 1751 break; 1752 } 1753 error = sooptcopyout(sopt, &optval, 1754 sizeof optval); 1755 break; 1756 1757 case IPV6_MULTICAST_IF: 1758 case IPV6_MULTICAST_HOPS: 1759 case IPV6_MULTICAST_LOOP: 1760 case IPV6_JOIN_GROUP: 1761 case IPV6_LEAVE_GROUP: 1762 { 1763 struct mbuf *m; 1764 error = ip6_getmoptions(sopt->sopt_name, 1765 in6p->in6p_moptions, &m); 1766 if (error == 0) 1767 error = sooptcopyout(sopt, 1768 mtod(m, char *), m->m_len); 1769 m_freem(m); 1770 } 1771 break; 1772 1773 #if defined(IPSEC) || defined(FAST_IPSEC) 1774 case IPV6_IPSEC_POLICY: 1775 { 1776 caddr_t req = NULL; 1777 size_t len = 0; 1778 struct mbuf *m = NULL; 1779 struct mbuf **mp = &m; 1780 1781 error = soopt_getm(sopt, &m); /* XXX */ 1782 if (error != NULL) 1783 break; 1784 error = soopt_mcopyin(sopt, m); /* XXX */ 1785 if (error != NULL) 1786 break; 1787 if (m) { 1788 req = mtod(m, caddr_t); 1789 len = m->m_len; 1790 } 1791 error = ipsec6_get_policy(in6p, req, len, mp); 1792 if (error == 0) 1793 error = soopt_mcopyout(sopt, m); /*XXX*/ 1794 if (error == 0 && m) 1795 m_freem(m); 1796 break; 1797 } 1798 #endif /* KAME IPSEC */ 1799 1800 case IPV6_FW_GET: 1801 { 1802 struct mbuf *m; 1803 struct mbuf **mp = &m; 1804 1805 if (ip6_fw_ctl_ptr == NULL) 1806 { 1807 return EINVAL; 1808 } 1809 error = (*ip6_fw_ctl_ptr)(optname, mp); 1810 if (error == 0) 1811 error = soopt_mcopyout(sopt, m); /* XXX */ 1812 if (error == 0 && m) 1813 m_freem(m); 1814 } 1815 break; 1816 1817 default: 1818 error = ENOPROTOOPT; 1819 break; 1820 } 1821 break; 1822 } 1823 } else { 1824 error = EINVAL; 1825 } 1826 return(error); 1827 } 1828 1829 /* 1830 * Set up IP6 options in pcb for insertion in output packets or 1831 * specifying behavior of outgoing packets. 1832 */ 1833 static int 1834 ip6_pcbopts(pktopt, m, so, sopt) 1835 struct ip6_pktopts **pktopt; 1836 struct mbuf *m; 1837 struct socket *so; 1838 struct sockopt *sopt; 1839 { 1840 struct ip6_pktopts *opt = *pktopt; 1841 int error = 0; 1842 struct proc *p = sopt->sopt_p; 1843 int priv = 0; 1844 1845 /* turn off any old options. */ 1846 if (opt) { 1847 #ifdef DIAGNOSTIC 1848 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 1849 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 1850 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 1851 printf("ip6_pcbopts: all specified options are cleared.\n"); 1852 #endif 1853 ip6_clearpktopts(opt, 1, -1); 1854 } else 1855 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 1856 *pktopt = NULL; 1857 1858 if (!m || m->m_len == 0) { 1859 /* 1860 * Only turning off any previous options, regardless of 1861 * whether the opt is just created or given. 1862 */ 1863 free(opt, M_IP6OPT); 1864 return(0); 1865 } 1866 1867 /* set options specified by user. */ 1868 if (p && !suser(p)) 1869 priv = 1; 1870 if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { 1871 ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ 1872 free(opt, M_IP6OPT); 1873 return(error); 1874 } 1875 *pktopt = opt; 1876 return(0); 1877 } 1878 1879 /* 1880 * initialize ip6_pktopts. beware that there are non-zero default values in 1881 * the struct. 1882 */ 1883 void 1884 init_ip6pktopts(opt) 1885 struct ip6_pktopts *opt; 1886 { 1887 1888 bzero(opt, sizeof(*opt)); 1889 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 1890 } 1891 1892 void 1893 ip6_clearpktopts(pktopt, needfree, optname) 1894 struct ip6_pktopts *pktopt; 1895 int needfree, optname; 1896 { 1897 if (pktopt == NULL) 1898 return; 1899 1900 if (optname == -1) { 1901 if (needfree && pktopt->ip6po_pktinfo) 1902 free(pktopt->ip6po_pktinfo, M_IP6OPT); 1903 pktopt->ip6po_pktinfo = NULL; 1904 } 1905 if (optname == -1) 1906 pktopt->ip6po_hlim = -1; 1907 if (optname == -1) { 1908 if (needfree && pktopt->ip6po_nexthop) 1909 free(pktopt->ip6po_nexthop, M_IP6OPT); 1910 pktopt->ip6po_nexthop = NULL; 1911 } 1912 if (optname == -1) { 1913 if (needfree && pktopt->ip6po_hbh) 1914 free(pktopt->ip6po_hbh, M_IP6OPT); 1915 pktopt->ip6po_hbh = NULL; 1916 } 1917 if (optname == -1) { 1918 if (needfree && pktopt->ip6po_dest1) 1919 free(pktopt->ip6po_dest1, M_IP6OPT); 1920 pktopt->ip6po_dest1 = NULL; 1921 } 1922 if (optname == -1) { 1923 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 1924 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 1925 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 1926 if (pktopt->ip6po_route.ro_rt) { 1927 RTFREE(pktopt->ip6po_route.ro_rt); 1928 pktopt->ip6po_route.ro_rt = NULL; 1929 } 1930 } 1931 if (optname == -1) { 1932 if (needfree && pktopt->ip6po_dest2) 1933 free(pktopt->ip6po_dest2, M_IP6OPT); 1934 pktopt->ip6po_dest2 = NULL; 1935 } 1936 } 1937 1938 #define PKTOPT_EXTHDRCPY(type) \ 1939 do {\ 1940 if (src->type) {\ 1941 int hlen =\ 1942 (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 1943 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 1944 if (dst->type == NULL && canwait == M_NOWAIT)\ 1945 goto bad;\ 1946 bcopy(src->type, dst->type, hlen);\ 1947 }\ 1948 } while (0) 1949 1950 struct ip6_pktopts * 1951 ip6_copypktopts(src, canwait) 1952 struct ip6_pktopts *src; 1953 int canwait; 1954 { 1955 struct ip6_pktopts *dst; 1956 1957 if (src == NULL) { 1958 printf("ip6_clearpktopts: invalid argument\n"); 1959 return(NULL); 1960 } 1961 1962 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 1963 if (dst == NULL && canwait == M_NOWAIT) 1964 return (NULL); 1965 bzero(dst, sizeof(*dst)); 1966 1967 dst->ip6po_hlim = src->ip6po_hlim; 1968 if (src->ip6po_pktinfo) { 1969 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 1970 M_IP6OPT, canwait); 1971 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 1972 goto bad; 1973 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 1974 } 1975 if (src->ip6po_nexthop) { 1976 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 1977 M_IP6OPT, canwait); 1978 if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) 1979 goto bad; 1980 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 1981 src->ip6po_nexthop->sa_len); 1982 } 1983 PKTOPT_EXTHDRCPY(ip6po_hbh); 1984 PKTOPT_EXTHDRCPY(ip6po_dest1); 1985 PKTOPT_EXTHDRCPY(ip6po_dest2); 1986 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 1987 return(dst); 1988 1989 bad: 1990 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 1991 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 1992 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 1993 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 1994 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 1995 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 1996 free(dst, M_IP6OPT); 1997 return(NULL); 1998 } 1999 #undef PKTOPT_EXTHDRCPY 2000 2001 void 2002 ip6_freepcbopts(pktopt) 2003 struct ip6_pktopts *pktopt; 2004 { 2005 if (pktopt == NULL) 2006 return; 2007 2008 ip6_clearpktopts(pktopt, 1, -1); 2009 2010 free(pktopt, M_IP6OPT); 2011 } 2012 2013 /* 2014 * Set the IP6 multicast options in response to user setsockopt(). 2015 */ 2016 static int 2017 ip6_setmoptions(optname, im6op, m) 2018 int optname; 2019 struct ip6_moptions **im6op; 2020 struct mbuf *m; 2021 { 2022 int error = 0; 2023 u_int loop, ifindex; 2024 struct ipv6_mreq *mreq; 2025 struct ifnet *ifp; 2026 struct ip6_moptions *im6o = *im6op; 2027 struct route_in6 ro; 2028 struct sockaddr_in6 *dst; 2029 struct in6_multi_mship *imm; 2030 struct proc *p = curproc; /* XXX */ 2031 2032 if (im6o == NULL) { 2033 /* 2034 * No multicast option buffer attached to the pcb; 2035 * allocate one and initialize to default values. 2036 */ 2037 im6o = (struct ip6_moptions *) 2038 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2039 2040 if (im6o == NULL) 2041 return(ENOBUFS); 2042 *im6op = im6o; 2043 im6o->im6o_multicast_ifp = NULL; 2044 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2045 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2046 LIST_INIT(&im6o->im6o_memberships); 2047 } 2048 2049 switch (optname) { 2050 2051 case IPV6_MULTICAST_IF: 2052 /* 2053 * Select the interface for outgoing multicast packets. 2054 */ 2055 if (m == NULL || m->m_len != sizeof(u_int)) { 2056 error = EINVAL; 2057 break; 2058 } 2059 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2060 if (ifindex < 0 || if_index < ifindex) { 2061 error = ENXIO; /* XXX EINVAL? */ 2062 break; 2063 } 2064 ifp = ifindex2ifnet[ifindex]; 2065 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2066 error = EADDRNOTAVAIL; 2067 break; 2068 } 2069 im6o->im6o_multicast_ifp = ifp; 2070 break; 2071 2072 case IPV6_MULTICAST_HOPS: 2073 { 2074 /* 2075 * Set the IP6 hoplimit for outgoing multicast packets. 2076 */ 2077 int optval; 2078 if (m == NULL || m->m_len != sizeof(int)) { 2079 error = EINVAL; 2080 break; 2081 } 2082 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2083 if (optval < -1 || optval >= 256) 2084 error = EINVAL; 2085 else if (optval == -1) 2086 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2087 else 2088 im6o->im6o_multicast_hlim = optval; 2089 break; 2090 } 2091 2092 case IPV6_MULTICAST_LOOP: 2093 /* 2094 * Set the loopback flag for outgoing multicast packets. 2095 * Must be zero or one. 2096 */ 2097 if (m == NULL || m->m_len != sizeof(u_int)) { 2098 error = EINVAL; 2099 break; 2100 } 2101 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2102 if (loop > 1) { 2103 error = EINVAL; 2104 break; 2105 } 2106 im6o->im6o_multicast_loop = loop; 2107 break; 2108 2109 case IPV6_JOIN_GROUP: 2110 /* 2111 * Add a multicast group membership. 2112 * Group must be a valid IP6 multicast address. 2113 */ 2114 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2115 error = EINVAL; 2116 break; 2117 } 2118 mreq = mtod(m, struct ipv6_mreq *); 2119 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2120 /* 2121 * We use the unspecified address to specify to accept 2122 * all multicast addresses. Only super user is allowed 2123 * to do this. 2124 */ 2125 if (suser(p)) 2126 { 2127 error = EACCES; 2128 break; 2129 } 2130 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2131 error = EINVAL; 2132 break; 2133 } 2134 2135 /* 2136 * If the interface is specified, validate it. 2137 */ 2138 if (mreq->ipv6mr_interface < 0 || 2139 if_index < mreq->ipv6mr_interface) { 2140 error = ENXIO; /* XXX EINVAL? */ 2141 break; 2142 } 2143 /* 2144 * If no interface was explicitly specified, choose an 2145 * appropriate one according to the given multicast address. 2146 */ 2147 if (mreq->ipv6mr_interface == 0) { 2148 /* 2149 * If the multicast address is in node-local scope, 2150 * the interface should be a loopback interface. 2151 * Otherwise, look up the routing table for the 2152 * address, and choose the outgoing interface. 2153 * XXX: is it a good approach? 2154 */ 2155 if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { 2156 ifp = &loif[0]; 2157 } else { 2158 ro.ro_rt = NULL; 2159 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2160 bzero(dst, sizeof(*dst)); 2161 dst->sin6_len = sizeof(struct sockaddr_in6); 2162 dst->sin6_family = AF_INET6; 2163 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2164 rtalloc((struct route *)&ro); 2165 if (ro.ro_rt == NULL) { 2166 error = EADDRNOTAVAIL; 2167 break; 2168 } 2169 ifp = ro.ro_rt->rt_ifp; 2170 rtfree(ro.ro_rt); 2171 } 2172 } else 2173 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2174 2175 /* 2176 * See if we found an interface, and confirm that it 2177 * supports multicast 2178 */ 2179 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2180 error = EADDRNOTAVAIL; 2181 break; 2182 } 2183 /* 2184 * Put interface index into the multicast address, 2185 * if the address has link-local scope. 2186 */ 2187 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2188 mreq->ipv6mr_multiaddr.s6_addr16[1] = 2189 htons(ifp->if_index); 2190 } 2191 /* 2192 * See if the membership already exists. 2193 */ 2194 for (imm = im6o->im6o_memberships.lh_first; 2195 imm != NULL; imm = imm->i6mm_chain.le_next) 2196 if (imm->i6mm_maddr->in6m_ifp == ifp && 2197 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2198 &mreq->ipv6mr_multiaddr)) 2199 break; 2200 if (imm != NULL) { 2201 error = EADDRINUSE; 2202 break; 2203 } 2204 /* 2205 * Everything looks good; add a new record to the multicast 2206 * address list for the given interface. 2207 */ 2208 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2209 if (imm == NULL) { 2210 error = ENOBUFS; 2211 break; 2212 } 2213 if ((imm->i6mm_maddr = 2214 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2215 free(imm, M_IPMADDR); 2216 break; 2217 } 2218 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2219 break; 2220 2221 case IPV6_LEAVE_GROUP: 2222 /* 2223 * Drop a multicast group membership. 2224 * Group must be a valid IP6 multicast address. 2225 */ 2226 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2227 error = EINVAL; 2228 break; 2229 } 2230 mreq = mtod(m, struct ipv6_mreq *); 2231 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2232 if (suser(p)) { 2233 error = EACCES; 2234 break; 2235 } 2236 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2237 error = EINVAL; 2238 break; 2239 } 2240 /* 2241 * If an interface address was specified, get a pointer 2242 * to its ifnet structure. 2243 */ 2244 if (mreq->ipv6mr_interface < 0 2245 || if_index < mreq->ipv6mr_interface) { 2246 error = ENXIO; /* XXX EINVAL? */ 2247 break; 2248 } 2249 ifp = ifindex2ifnet[mreq->ipv6mr_interface]; 2250 /* 2251 * Put interface index into the multicast address, 2252 * if the address has link-local scope. 2253 */ 2254 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2255 mreq->ipv6mr_multiaddr.s6_addr16[1] 2256 = htons(mreq->ipv6mr_interface); 2257 } 2258 /* 2259 * Find the membership in the membership list. 2260 */ 2261 for (imm = im6o->im6o_memberships.lh_first; 2262 imm != NULL; imm = imm->i6mm_chain.le_next) { 2263 if ((ifp == NULL || 2264 imm->i6mm_maddr->in6m_ifp == ifp) && 2265 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2266 &mreq->ipv6mr_multiaddr)) 2267 break; 2268 } 2269 if (imm == NULL) { 2270 /* Unable to resolve interface */ 2271 error = EADDRNOTAVAIL; 2272 break; 2273 } 2274 /* 2275 * Give up the multicast address record to which the 2276 * membership points. 2277 */ 2278 LIST_REMOVE(imm, i6mm_chain); 2279 in6_delmulti(imm->i6mm_maddr); 2280 free(imm, M_IPMADDR); 2281 break; 2282 2283 default: 2284 error = EOPNOTSUPP; 2285 break; 2286 } 2287 2288 /* 2289 * If all options have default values, no need to keep the mbuf. 2290 */ 2291 if (im6o->im6o_multicast_ifp == NULL && 2292 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2293 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2294 im6o->im6o_memberships.lh_first == NULL) { 2295 free(*im6op, M_IPMOPTS); 2296 *im6op = NULL; 2297 } 2298 2299 return(error); 2300 } 2301 2302 /* 2303 * Return the IP6 multicast options in response to user getsockopt(). 2304 */ 2305 static int 2306 ip6_getmoptions(optname, im6o, mp) 2307 int optname; 2308 struct ip6_moptions *im6o; 2309 struct mbuf **mp; 2310 { 2311 u_int *hlim, *loop, *ifindex; 2312 2313 *mp = m_get(M_WAIT, MT_HEADER); /* XXX */ 2314 2315 switch (optname) { 2316 2317 case IPV6_MULTICAST_IF: 2318 ifindex = mtod(*mp, u_int *); 2319 (*mp)->m_len = sizeof(u_int); 2320 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2321 *ifindex = 0; 2322 else 2323 *ifindex = im6o->im6o_multicast_ifp->if_index; 2324 return(0); 2325 2326 case IPV6_MULTICAST_HOPS: 2327 hlim = mtod(*mp, u_int *); 2328 (*mp)->m_len = sizeof(u_int); 2329 if (im6o == NULL) 2330 *hlim = ip6_defmcasthlim; 2331 else 2332 *hlim = im6o->im6o_multicast_hlim; 2333 return(0); 2334 2335 case IPV6_MULTICAST_LOOP: 2336 loop = mtod(*mp, u_int *); 2337 (*mp)->m_len = sizeof(u_int); 2338 if (im6o == NULL) 2339 *loop = ip6_defmcasthlim; 2340 else 2341 *loop = im6o->im6o_multicast_loop; 2342 return(0); 2343 2344 default: 2345 return(EOPNOTSUPP); 2346 } 2347 } 2348 2349 /* 2350 * Discard the IP6 multicast options. 2351 */ 2352 void 2353 ip6_freemoptions(im6o) 2354 struct ip6_moptions *im6o; 2355 { 2356 struct in6_multi_mship *imm; 2357 2358 if (im6o == NULL) 2359 return; 2360 2361 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2362 LIST_REMOVE(imm, i6mm_chain); 2363 if (imm->i6mm_maddr) 2364 in6_delmulti(imm->i6mm_maddr); 2365 free(imm, M_IPMADDR); 2366 } 2367 free(im6o, M_IPMOPTS); 2368 } 2369 2370 /* 2371 * Set IPv6 outgoing packet options based on advanced API. 2372 */ 2373 int 2374 ip6_setpktoptions(control, opt, priv, needcopy) 2375 struct mbuf *control; 2376 struct ip6_pktopts *opt; 2377 int priv, needcopy; 2378 { 2379 struct cmsghdr *cm = 0; 2380 2381 if (control == 0 || opt == 0) 2382 return(EINVAL); 2383 2384 init_ip6pktopts(opt); 2385 2386 /* 2387 * XXX: Currently, we assume all the optional information is stored 2388 * in a single mbuf. 2389 */ 2390 if (control->m_next) 2391 return(EINVAL); 2392 2393 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2394 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2395 cm = mtod(control, struct cmsghdr *); 2396 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2397 return(EINVAL); 2398 if (cm->cmsg_level != IPPROTO_IPV6) 2399 continue; 2400 2401 /* 2402 * XXX should check if RFC2292 API is mixed with 2292bis API 2403 */ 2404 switch (cm->cmsg_type) { 2405 case IPV6_PKTINFO: 2406 if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) 2407 return(EINVAL); 2408 if (needcopy) { 2409 /* XXX: Is it really WAITOK? */ 2410 opt->ip6po_pktinfo = 2411 malloc(sizeof(struct in6_pktinfo), 2412 M_IP6OPT, M_WAITOK); 2413 bcopy(CMSG_DATA(cm), opt->ip6po_pktinfo, 2414 sizeof(struct in6_pktinfo)); 2415 } else 2416 opt->ip6po_pktinfo = 2417 (struct in6_pktinfo *)CMSG_DATA(cm); 2418 if (opt->ip6po_pktinfo->ipi6_ifindex && 2419 IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) 2420 opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = 2421 htons(opt->ip6po_pktinfo->ipi6_ifindex); 2422 2423 if (opt->ip6po_pktinfo->ipi6_ifindex > if_index 2424 || opt->ip6po_pktinfo->ipi6_ifindex < 0) { 2425 return(ENXIO); 2426 } 2427 2428 /* 2429 * Check if the requested source address is indeed a 2430 * unicast address assigned to the node, and can be 2431 * used as the packet's source address. 2432 */ 2433 if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { 2434 struct in6_ifaddr *ia6; 2435 struct sockaddr_in6 sin6; 2436 2437 bzero(&sin6, sizeof(sin6)); 2438 sin6.sin6_len = sizeof(sin6); 2439 sin6.sin6_family = AF_INET6; 2440 sin6.sin6_addr = 2441 opt->ip6po_pktinfo->ipi6_addr; 2442 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(sin6tosa(&sin6)); 2443 if (ia6 == NULL || 2444 (ia6->ia6_flags & (IN6_IFF_ANYCAST | 2445 IN6_IFF_NOTREADY)) != 0) 2446 return(EADDRNOTAVAIL); 2447 } 2448 break; 2449 2450 case IPV6_HOPLIMIT: 2451 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) 2452 return(EINVAL); 2453 2454 opt->ip6po_hlim = *(int *)CMSG_DATA(cm); 2455 if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) 2456 return(EINVAL); 2457 break; 2458 2459 case IPV6_NEXTHOP: 2460 if (!priv) 2461 return(EPERM); 2462 2463 if (cm->cmsg_len < sizeof(u_char) || 2464 /* check if cmsg_len is large enough for sa_len */ 2465 cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) 2466 return(EINVAL); 2467 2468 if (needcopy) { 2469 opt->ip6po_nexthop = 2470 malloc(*CMSG_DATA(cm), 2471 M_IP6OPT, M_WAITOK); 2472 bcopy(CMSG_DATA(cm), 2473 opt->ip6po_nexthop, 2474 *CMSG_DATA(cm)); 2475 } else 2476 opt->ip6po_nexthop = 2477 (struct sockaddr *)CMSG_DATA(cm); 2478 break; 2479 2480 case IPV6_HOPOPTS: 2481 { 2482 struct ip6_hbh *hbh; 2483 int hbhlen; 2484 2485 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) 2486 return(EINVAL); 2487 hbh = (struct ip6_hbh *)CMSG_DATA(cm); 2488 hbhlen = (hbh->ip6h_len + 1) << 3; 2489 if (cm->cmsg_len != CMSG_LEN(hbhlen)) 2490 return(EINVAL); 2491 2492 if (needcopy) { 2493 opt->ip6po_hbh = 2494 malloc(hbhlen, M_IP6OPT, M_WAITOK); 2495 bcopy(hbh, opt->ip6po_hbh, hbhlen); 2496 } else 2497 opt->ip6po_hbh = hbh; 2498 break; 2499 } 2500 2501 case IPV6_DSTOPTS: 2502 { 2503 struct ip6_dest *dest, **newdest; 2504 int destlen; 2505 2506 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) 2507 return(EINVAL); 2508 dest = (struct ip6_dest *)CMSG_DATA(cm); 2509 destlen = (dest->ip6d_len + 1) << 3; 2510 if (cm->cmsg_len != CMSG_LEN(destlen)) 2511 return(EINVAL); 2512 2513 /* 2514 * The old advacned API is ambiguous on this 2515 * point. Our approach is to determine the 2516 * position based according to the existence 2517 * of a routing header. Note, however, that 2518 * this depends on the order of the extension 2519 * headers in the ancillary data; the 1st part 2520 * of the destination options header must 2521 * appear before the routing header in the 2522 * ancillary data, too. 2523 * RFC2292bis solved the ambiguity by 2524 * introducing separate cmsg types. 2525 */ 2526 if (opt->ip6po_rthdr == NULL) 2527 newdest = &opt->ip6po_dest1; 2528 else 2529 newdest = &opt->ip6po_dest2; 2530 2531 if (needcopy) { 2532 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 2533 bcopy(dest, *newdest, destlen); 2534 } else 2535 *newdest = dest; 2536 2537 break; 2538 } 2539 2540 case IPV6_RTHDR: 2541 { 2542 struct ip6_rthdr *rth; 2543 int rthlen; 2544 2545 if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) 2546 return(EINVAL); 2547 rth = (struct ip6_rthdr *)CMSG_DATA(cm); 2548 rthlen = (rth->ip6r_len + 1) << 3; 2549 if (cm->cmsg_len != CMSG_LEN(rthlen)) 2550 return(EINVAL); 2551 2552 switch (rth->ip6r_type) { 2553 case IPV6_RTHDR_TYPE_0: 2554 /* must contain one addr */ 2555 if (rth->ip6r_len == 0) 2556 return(EINVAL); 2557 /* length must be even */ 2558 if (rth->ip6r_len % 2) 2559 return(EINVAL); 2560 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 2561 return(EINVAL); 2562 break; 2563 default: 2564 return(EINVAL); /* not supported */ 2565 } 2566 2567 if (needcopy) { 2568 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, 2569 M_WAITOK); 2570 bcopy(rth, opt->ip6po_rthdr, rthlen); 2571 } else 2572 opt->ip6po_rthdr = rth; 2573 2574 break; 2575 } 2576 2577 default: 2578 return(ENOPROTOOPT); 2579 } 2580 } 2581 2582 return(0); 2583 } 2584 2585 /* 2586 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 2587 * packet to the input queue of a specified interface. Note that this 2588 * calls the output routine of the loopback "driver", but with an interface 2589 * pointer that might NOT be &loif -- easier than replicating that code here. 2590 */ 2591 void 2592 ip6_mloopback(ifp, m, dst) 2593 struct ifnet *ifp; 2594 struct mbuf *m; 2595 struct sockaddr_in6 *dst; 2596 { 2597 struct mbuf *copym; 2598 struct ip6_hdr *ip6; 2599 2600 copym = m_copy(m, 0, M_COPYALL); 2601 if (copym == NULL) 2602 return; 2603 2604 /* 2605 * Make sure to deep-copy IPv6 header portion in case the data 2606 * is in an mbuf cluster, so that we can safely override the IPv6 2607 * header portion later. 2608 */ 2609 if ((copym->m_flags & M_EXT) != 0 || 2610 copym->m_len < sizeof(struct ip6_hdr)) { 2611 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 2612 if (copym == NULL) 2613 return; 2614 } 2615 2616 #ifdef DIAGNOSTIC 2617 if (copym->m_len < sizeof(*ip6)) { 2618 m_freem(copym); 2619 return; 2620 } 2621 #endif 2622 2623 ip6 = mtod(copym, struct ip6_hdr *); 2624 #ifndef SCOPEDROUTING 2625 /* 2626 * clear embedded scope identifiers if necessary. 2627 * in6_clearscope will touch the addresses only when necessary. 2628 */ 2629 in6_clearscope(&ip6->ip6_src); 2630 in6_clearscope(&ip6->ip6_dst); 2631 #endif 2632 2633 (void)if_simloop(ifp, copym, dst->sin6_family, NULL); 2634 } 2635 2636 /* 2637 * Chop IPv6 header off from the payload. 2638 */ 2639 static int 2640 ip6_splithdr(m, exthdrs) 2641 struct mbuf *m; 2642 struct ip6_exthdrs *exthdrs; 2643 { 2644 struct mbuf *mh; 2645 struct ip6_hdr *ip6; 2646 2647 ip6 = mtod(m, struct ip6_hdr *); 2648 if (m->m_len > sizeof(*ip6)) { 2649 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 2650 if (mh == 0) { 2651 m_freem(m); 2652 return ENOBUFS; 2653 } 2654 M_MOVE_PKTHDR(mh, m); 2655 MH_ALIGN(mh, sizeof(*ip6)); 2656 m->m_len -= sizeof(*ip6); 2657 m->m_data += sizeof(*ip6); 2658 mh->m_next = m; 2659 m = mh; 2660 m->m_len = sizeof(*ip6); 2661 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 2662 } 2663 exthdrs->ip6e_ip6 = m; 2664 return 0; 2665 } 2666 2667 /* 2668 * Compute IPv6 extension header length. 2669 */ 2670 int 2671 ip6_optlen(in6p) 2672 struct in6pcb *in6p; 2673 { 2674 int len; 2675 2676 if (!in6p->in6p_outputopts) 2677 return 0; 2678 2679 len = 0; 2680 #define elen(x) \ 2681 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 2682 2683 len += elen(in6p->in6p_outputopts->ip6po_hbh); 2684 if (in6p->in6p_outputopts->ip6po_rthdr) 2685 /* dest1 is valid with rthdr only */ 2686 len += elen(in6p->in6p_outputopts->ip6po_dest1); 2687 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 2688 len += elen(in6p->in6p_outputopts->ip6po_dest2); 2689 return len; 2690 #undef elen 2691 }
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