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sys/netinet6/ip6_output.c
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1 /* $FreeBSD: releng/6.0/sys/netinet6/ip6_output.c 151166 2005-10-09 06:51:11Z ume $ */ 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 * 4. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 62 */ 63 64 #include "opt_ip6fw.h" 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/proc.h> 73 #include <sys/errno.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/systm.h> 78 #include <sys/kernel.h> 79 80 #include <net/if.h> 81 #include <net/netisr.h> 82 #include <net/route.h> 83 #include <net/pfil.h> 84 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 #include <netinet6/in6_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet/icmp6.h> 90 #include <netinet6/ip6_var.h> 91 #include <netinet/in_pcb.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet6/nd6.h> 94 95 #ifdef IPSEC 96 #include <netinet6/ipsec.h> 97 #ifdef INET6 98 #include <netinet6/ipsec6.h> 99 #endif 100 #include <netkey/key.h> 101 #endif /* IPSEC */ 102 103 #ifdef FAST_IPSEC 104 #include <netipsec/ipsec.h> 105 #include <netipsec/ipsec6.h> 106 #include <netipsec/key.h> 107 #endif /* FAST_IPSEC */ 108 109 #include <netinet6/ip6_fw.h> 110 111 #include <net/net_osdep.h> 112 113 #include <netinet6/ip6protosw.h> 114 115 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); 116 117 struct ip6_exthdrs { 118 struct mbuf *ip6e_ip6; 119 struct mbuf *ip6e_hbh; 120 struct mbuf *ip6e_dest1; 121 struct mbuf *ip6e_rthdr; 122 struct mbuf *ip6e_dest2; 123 }; 124 125 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 126 int, int)); 127 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 128 struct socket *, struct sockopt *)); 129 static int ip6_getpcbopt __P((struct ip6_pktopts *, int, struct sockopt *)); 130 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, int, 131 int, int, int)); 132 133 static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); 134 static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); 135 static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); 136 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 137 struct ip6_frag **)); 138 static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); 139 static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); 140 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 141 struct ifnet *, struct in6_addr *, u_long *, int *)); 142 143 144 /* 145 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 146 * header (with pri, len, nxt, hlim, src, dst). 147 * This function may modify ver and hlim only. 148 * The mbuf chain containing the packet will be freed. 149 * The mbuf opt, if present, will not be freed. 150 * 151 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 152 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 153 * which is rt_rmx.rmx_mtu. 154 */ 155 int 156 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 157 struct mbuf *m0; 158 struct ip6_pktopts *opt; 159 struct route_in6 *ro; 160 int flags; 161 struct ip6_moptions *im6o; 162 struct ifnet **ifpp; /* XXX: just for statistics */ 163 struct inpcb *inp; 164 { 165 struct ip6_hdr *ip6, *mhip6; 166 struct ifnet *ifp, *origifp; 167 struct mbuf *m = m0; 168 int hlen, tlen, len, off; 169 struct route_in6 ip6route; 170 struct sockaddr_in6 *dst; 171 struct in6_addr odst; 172 int error = 0; 173 struct in6_ifaddr *ia = NULL; 174 u_long mtu; 175 int alwaysfrag, dontfrag; 176 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 177 struct ip6_exthdrs exthdrs; 178 struct in6_addr finaldst; 179 struct route_in6 *ro_pmtu = NULL; 180 int hdrsplit = 0; 181 int needipsec = 0; 182 #if defined(IPSEC) || defined(FAST_IPSEC) 183 int needipsectun = 0; 184 struct secpolicy *sp = NULL; 185 #endif /*IPSEC || FAST_IPSEC*/ 186 187 ip6 = mtod(m, struct ip6_hdr *); 188 finaldst = ip6->ip6_dst; 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 (/*CONSTCOND*/ 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 if (opt->ip6po_rthdr) { 208 /* 209 * Destination options header(1st part) 210 * This only makes sence with a routing header. 211 * See Section 9.2 of RFC 3542. 212 * Disabling this part just for MIP6 convenience is 213 * a bad idea. We need to think carefully about a 214 * way to make the advanced API coexist with MIP6 215 * options, which might automatically be inserted in 216 * the kernel. 217 */ 218 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 219 } 220 /* Routing header */ 221 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 222 /* Destination options header(2nd part) */ 223 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 224 } 225 226 #ifdef IPSEC 227 /* get a security policy for this packet */ 228 if (inp == NULL) 229 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 230 else 231 sp = ipsec6_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &error); 232 233 if (sp == NULL) { 234 ipsec6stat.out_inval++; 235 goto freehdrs; 236 } 237 238 error = 0; 239 240 /* check policy */ 241 switch (sp->policy) { 242 case IPSEC_POLICY_DISCARD: 243 /* 244 * This packet is just discarded. 245 */ 246 ipsec6stat.out_polvio++; 247 goto freehdrs; 248 249 case IPSEC_POLICY_BYPASS: 250 case IPSEC_POLICY_NONE: 251 /* no need to do IPsec. */ 252 needipsec = 0; 253 break; 254 255 case IPSEC_POLICY_IPSEC: 256 if (sp->req == NULL) { 257 /* acquire a policy */ 258 error = key_spdacquire(sp); 259 goto freehdrs; 260 } 261 needipsec = 1; 262 break; 263 264 case IPSEC_POLICY_ENTRUST: 265 default: 266 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 267 } 268 #endif /* IPSEC */ 269 #ifdef FAST_IPSEC 270 /* get a security policy for this packet */ 271 if (inp == NULL) 272 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 273 else 274 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 275 276 if (sp == NULL) { 277 newipsecstat.ips_out_inval++; 278 goto freehdrs; 279 } 280 281 error = 0; 282 283 /* check policy */ 284 switch (sp->policy) { 285 case IPSEC_POLICY_DISCARD: 286 /* 287 * This packet is just discarded. 288 */ 289 newipsecstat.ips_out_polvio++; 290 goto freehdrs; 291 292 case IPSEC_POLICY_BYPASS: 293 case IPSEC_POLICY_NONE: 294 /* no need to do IPsec. */ 295 needipsec = 0; 296 break; 297 298 case IPSEC_POLICY_IPSEC: 299 if (sp->req == NULL) { 300 /* acquire a policy */ 301 error = key_spdacquire(sp); 302 goto freehdrs; 303 } 304 needipsec = 1; 305 break; 306 307 case IPSEC_POLICY_ENTRUST: 308 default: 309 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 310 } 311 #endif /* FAST_IPSEC */ 312 313 /* 314 * Calculate the total length of the extension header chain. 315 * Keep the length of the unfragmentable part for fragmentation. 316 */ 317 optlen = 0; 318 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 319 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 320 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 321 unfragpartlen = optlen + sizeof(struct ip6_hdr); 322 /* NOTE: we don't add AH/ESP length here. do that later. */ 323 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 324 325 /* 326 * If we need IPsec, or there is at least one extension header, 327 * separate IP6 header from the payload. 328 */ 329 if ((needipsec || optlen) && !hdrsplit) { 330 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 331 m = NULL; 332 goto freehdrs; 333 } 334 m = exthdrs.ip6e_ip6; 335 hdrsplit++; 336 } 337 338 /* adjust pointer */ 339 ip6 = mtod(m, struct ip6_hdr *); 340 341 /* adjust mbuf packet header length */ 342 m->m_pkthdr.len += optlen; 343 plen = m->m_pkthdr.len - sizeof(*ip6); 344 345 /* If this is a jumbo payload, insert a jumbo payload option. */ 346 if (plen > IPV6_MAXPACKET) { 347 if (!hdrsplit) { 348 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 349 m = NULL; 350 goto freehdrs; 351 } 352 m = exthdrs.ip6e_ip6; 353 hdrsplit++; 354 } 355 /* adjust pointer */ 356 ip6 = mtod(m, struct ip6_hdr *); 357 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 358 goto freehdrs; 359 ip6->ip6_plen = 0; 360 } else 361 ip6->ip6_plen = htons(plen); 362 363 /* 364 * Concatenate headers and fill in next header fields. 365 * Here we have, on "m" 366 * IPv6 payload 367 * and we insert headers accordingly. Finally, we should be getting: 368 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 369 * 370 * during the header composing process, "m" points to IPv6 header. 371 * "mprev" points to an extension header prior to esp. 372 */ 373 { 374 u_char *nexthdrp = &ip6->ip6_nxt; 375 struct mbuf *mprev = m; 376 377 /* 378 * we treat dest2 specially. this makes IPsec processing 379 * much easier. the goal here is to make mprev point the 380 * mbuf prior to dest2. 381 * 382 * result: IPv6 dest2 payload 383 * m and mprev will point to IPv6 header. 384 */ 385 if (exthdrs.ip6e_dest2) { 386 if (!hdrsplit) 387 panic("assumption failed: hdr not split"); 388 exthdrs.ip6e_dest2->m_next = m->m_next; 389 m->m_next = exthdrs.ip6e_dest2; 390 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 391 ip6->ip6_nxt = IPPROTO_DSTOPTS; 392 } 393 394 #define MAKE_CHAIN(m, mp, p, i)\ 395 do {\ 396 if (m) {\ 397 if (!hdrsplit) \ 398 panic("assumption failed: hdr not split"); \ 399 *mtod((m), u_char *) = *(p);\ 400 *(p) = (i);\ 401 p = mtod((m), u_char *);\ 402 (m)->m_next = (mp)->m_next;\ 403 (mp)->m_next = (m);\ 404 (mp) = (m);\ 405 }\ 406 } while (/*CONSTCOND*/ 0) 407 /* 408 * result: IPv6 hbh dest1 rthdr dest2 payload 409 * m will point to IPv6 header. mprev will point to the 410 * extension header prior to dest2 (rthdr in the above case). 411 */ 412 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 413 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 414 IPPROTO_DSTOPTS); 415 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 416 IPPROTO_ROUTING); 417 418 #if defined(IPSEC) || defined(FAST_IPSEC) 419 if (!needipsec) 420 goto skip_ipsec2; 421 422 /* 423 * pointers after IPsec headers are not valid any more. 424 * other pointers need a great care too. 425 * (IPsec routines should not mangle mbufs prior to AH/ESP) 426 */ 427 exthdrs.ip6e_dest2 = NULL; 428 429 { 430 struct ip6_rthdr *rh = NULL; 431 int segleft_org = 0; 432 struct ipsec_output_state state; 433 434 if (exthdrs.ip6e_rthdr) { 435 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 436 segleft_org = rh->ip6r_segleft; 437 rh->ip6r_segleft = 0; 438 } 439 440 bzero(&state, sizeof(state)); 441 state.m = m; 442 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 443 &needipsectun); 444 m = state.m; 445 if (error) { 446 /* mbuf is already reclaimed in ipsec6_output_trans. */ 447 m = NULL; 448 switch (error) { 449 case EHOSTUNREACH: 450 case ENETUNREACH: 451 case EMSGSIZE: 452 case ENOBUFS: 453 case ENOMEM: 454 break; 455 default: 456 printf("ip6_output (ipsec): error code %d\n", error); 457 /* FALLTHROUGH */ 458 case ENOENT: 459 /* don't show these error codes to the user */ 460 error = 0; 461 break; 462 } 463 goto bad; 464 } 465 if (exthdrs.ip6e_rthdr) { 466 /* ah6_output doesn't modify mbuf chain */ 467 rh->ip6r_segleft = segleft_org; 468 } 469 } 470 skip_ipsec2:; 471 #endif 472 } 473 474 /* 475 * If there is a routing header, replace the destination address field 476 * with the first hop of the routing header. 477 */ 478 if (exthdrs.ip6e_rthdr) { 479 struct ip6_rthdr *rh = 480 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 481 struct ip6_rthdr *)); 482 struct ip6_rthdr0 *rh0; 483 struct in6_addr *addrs; 484 485 switch (rh->ip6r_type) { 486 case IPV6_RTHDR_TYPE_0: 487 rh0 = (struct ip6_rthdr0 *)rh; 488 addrs = (struct in6_addr *)(rh0 + 1); 489 490 ip6->ip6_dst = *addrs; 491 bcopy((caddr_t)(addrs + 1), (caddr_t)addrs, 492 sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) 493 ); 494 *(addrs + rh0->ip6r0_segleft - 1) = finaldst; 495 break; 496 default: /* is it possible? */ 497 error = EINVAL; 498 goto bad; 499 } 500 } 501 502 /* Source address validation */ 503 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 504 (flags & IPV6_DADOUTPUT) == 0) { 505 error = EOPNOTSUPP; 506 ip6stat.ip6s_badscope++; 507 goto bad; 508 } 509 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 510 error = EOPNOTSUPP; 511 ip6stat.ip6s_badscope++; 512 goto bad; 513 } 514 515 ip6stat.ip6s_localout++; 516 517 /* 518 * Route packet. 519 */ 520 if (ro == 0) { 521 ro = &ip6route; 522 bzero((caddr_t)ro, sizeof(*ro)); 523 } 524 ro_pmtu = ro; 525 if (opt && opt->ip6po_rthdr) 526 ro = &opt->ip6po_route; 527 dst = (struct sockaddr_in6 *)&ro->ro_dst; 528 529 again: 530 /* 531 * If there is a cached route, 532 * check that it is to the same destination 533 * and is still up. If not, free it and try again. 534 */ 535 if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || 536 dst->sin6_family != AF_INET6 || 537 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { 538 RTFREE(ro->ro_rt); 539 ro->ro_rt = (struct rtentry *)0; 540 } 541 if (ro->ro_rt == 0) { 542 bzero(dst, sizeof(*dst)); 543 dst->sin6_family = AF_INET6; 544 dst->sin6_len = sizeof(struct sockaddr_in6); 545 dst->sin6_addr = ip6->ip6_dst; 546 } 547 548 /* 549 * if specified, try to fill in the traffic class field. 550 * do not override if a non-zero value is already set. 551 * we check the diffserv field and the ecn field separately. 552 */ 553 if (opt && opt->ip6po_tclass >= 0) { 554 int mask = 0; 555 556 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 557 mask |= 0xfc; 558 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 559 mask |= 0x03; 560 if (mask != 0) 561 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 562 } 563 564 /* fill in or override the hop limit field, if necessary. */ 565 if (opt && opt->ip6po_hlim != -1) 566 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 567 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 568 if (im6o != NULL) 569 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 570 else 571 ip6->ip6_hlim = ip6_defmcasthlim; 572 } 573 574 #if defined(IPSEC) || defined(FAST_IPSEC) 575 if (needipsec && needipsectun) { 576 struct ipsec_output_state state; 577 578 /* 579 * All the extension headers will become inaccessible 580 * (since they can be encrypted). 581 * Don't panic, we need no more updates to extension headers 582 * on inner IPv6 packet (since they are now encapsulated). 583 * 584 * IPv6 [ESP|AH] IPv6 [extension headers] payload 585 */ 586 bzero(&exthdrs, sizeof(exthdrs)); 587 exthdrs.ip6e_ip6 = m; 588 589 bzero(&state, sizeof(state)); 590 state.m = m; 591 state.ro = (struct route *)ro; 592 state.dst = (struct sockaddr *)dst; 593 594 error = ipsec6_output_tunnel(&state, sp, flags); 595 596 m = state.m; 597 ro = (struct route_in6 *)state.ro; 598 dst = (struct sockaddr_in6 *)state.dst; 599 if (error) { 600 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 601 m0 = m = NULL; 602 m = NULL; 603 switch (error) { 604 case EHOSTUNREACH: 605 case ENETUNREACH: 606 case EMSGSIZE: 607 case ENOBUFS: 608 case ENOMEM: 609 break; 610 default: 611 printf("ip6_output (ipsec): error code %d\n", error); 612 /* FALLTHROUGH */ 613 case ENOENT: 614 /* don't show these error codes to the user */ 615 error = 0; 616 break; 617 } 618 goto bad; 619 } 620 621 exthdrs.ip6e_ip6 = m; 622 } 623 #endif /* IPSEC */ 624 625 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 626 /* Unicast */ 627 628 #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) 629 #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) 630 /* xxx 631 * interface selection comes here 632 * if an interface is specified from an upper layer, 633 * ifp must point it. 634 */ 635 if (ro->ro_rt == 0) { 636 /* 637 * non-bsdi always clone routes, if parent is 638 * PRF_CLONING. 639 */ 640 rtalloc((struct route *)ro); 641 } 642 if (ro->ro_rt == 0) { 643 ip6stat.ip6s_noroute++; 644 error = EHOSTUNREACH; 645 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ 646 goto bad; 647 } 648 /* XXX rt not locked */ 649 ia = ifatoia6(ro->ro_rt->rt_ifa); 650 ifp = ro->ro_rt->rt_ifp; 651 ro->ro_rt->rt_rmx.rmx_pksent++; 652 if (ro->ro_rt->rt_flags & RTF_GATEWAY) 653 dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; 654 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 655 656 in6_ifstat_inc(ifp, ifs6_out_request); 657 658 /* 659 * Check if the outgoing interface conflicts with 660 * the interface specified by ifi6_ifindex (if specified). 661 * Note that loopback interface is always okay. 662 * (this may happen when we are sending a packet to one of 663 * our own addresses.) 664 */ 665 if (opt && opt->ip6po_pktinfo 666 && opt->ip6po_pktinfo->ipi6_ifindex) { 667 if (!(ifp->if_flags & IFF_LOOPBACK) 668 && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { 669 ip6stat.ip6s_noroute++; 670 in6_ifstat_inc(ifp, ifs6_out_discard); 671 error = EHOSTUNREACH; 672 goto bad; 673 } 674 } 675 676 if (opt && opt->ip6po_hlim != -1) 677 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 678 } else { 679 /* Multicast */ 680 struct in6_multi *in6m; 681 682 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 683 684 /* 685 * See if the caller provided any multicast options 686 */ 687 ifp = NULL; 688 if (im6o != NULL) { 689 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 690 if (im6o->im6o_multicast_ifp != NULL) 691 ifp = im6o->im6o_multicast_ifp; 692 } else 693 ip6->ip6_hlim = ip6_defmcasthlim; 694 695 /* 696 * See if the caller provided the outgoing interface 697 * as an ancillary data. 698 * Boundary check for ifindex is assumed to be already done. 699 */ 700 if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) 701 ifp = ifnet_byindex(opt->ip6po_pktinfo->ipi6_ifindex); 702 703 /* 704 * If the destination is a node-local scope multicast, 705 * the packet should be loop-backed only. 706 */ 707 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 708 /* 709 * If the outgoing interface is already specified, 710 * it should be a loopback interface. 711 */ 712 if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { 713 ip6stat.ip6s_badscope++; 714 error = ENETUNREACH; /* XXX: better error? */ 715 /* XXX correct ifp? */ 716 in6_ifstat_inc(ifp, ifs6_out_discard); 717 goto bad; 718 } else { 719 ifp = &loif[0]; 720 } 721 } 722 723 if (opt && opt->ip6po_hlim != -1) 724 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 725 726 /* 727 * If caller did not provide an interface lookup a 728 * default in the routing table. This is either a 729 * default for the speicfied group (i.e. a host 730 * route), or a multicast default (a route for the 731 * ``net'' ff00::/8). 732 */ 733 if (ifp == NULL) { 734 if (ro->ro_rt == 0) 735 ro->ro_rt = rtalloc1((struct sockaddr *) 736 &ro->ro_dst, 0, 0UL); 737 else 738 RT_LOCK(ro->ro_rt); 739 if (ro->ro_rt == 0) { 740 ip6stat.ip6s_noroute++; 741 error = EHOSTUNREACH; 742 /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ 743 goto bad; 744 } 745 ia = ifatoia6(ro->ro_rt->rt_ifa); 746 ifp = ro->ro_rt->rt_ifp; 747 ro->ro_rt->rt_rmx.rmx_pksent++; 748 RT_UNLOCK(ro->ro_rt); 749 } 750 751 if ((flags & IPV6_FORWARDING) == 0) 752 in6_ifstat_inc(ifp, ifs6_out_request); 753 in6_ifstat_inc(ifp, ifs6_out_mcast); 754 755 /* 756 * Confirm that the outgoing interface supports multicast. 757 */ 758 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 759 ip6stat.ip6s_noroute++; 760 in6_ifstat_inc(ifp, ifs6_out_discard); 761 error = ENETUNREACH; 762 goto bad; 763 } 764 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 765 if (in6m != NULL && 766 (im6o == NULL || im6o->im6o_multicast_loop)) { 767 /* 768 * If we belong to the destination multicast group 769 * on the outgoing interface, and the caller did not 770 * forbid loopback, loop back a copy. 771 */ 772 ip6_mloopback(ifp, m, dst); 773 } else { 774 /* 775 * If we are acting as a multicast router, perform 776 * multicast forwarding as if the packet had just 777 * arrived on the interface to which we are about 778 * to send. The multicast forwarding function 779 * recursively calls this function, using the 780 * IPV6_FORWARDING flag to prevent infinite recursion. 781 * 782 * Multicasts that are looped back by ip6_mloopback(), 783 * above, will be forwarded by the ip6_input() routine, 784 * if necessary. 785 */ 786 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 787 if (ip6_mforward(ip6, ifp, m) != 0) { 788 m_freem(m); 789 goto done; 790 } 791 } 792 } 793 /* 794 * Multicasts with a hoplimit of zero may be looped back, 795 * above, but must not be transmitted on a network. 796 * Also, multicasts addressed to the loopback interface 797 * are not sent -- the above call to ip6_mloopback() will 798 * loop back a copy if this host actually belongs to the 799 * destination group on the loopback interface. 800 */ 801 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 802 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 803 m_freem(m); 804 goto done; 805 } 806 } 807 808 /* 809 * Fill the outgoing inteface to tell the upper layer 810 * to increment per-interface statistics. 811 */ 812 if (ifpp) 813 *ifpp = ifp; 814 815 /* Determine path MTU. */ 816 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 817 &alwaysfrag)) != 0) 818 goto bad; 819 820 /* 821 * The caller of this function may specify to use the minimum MTU 822 * in some cases. 823 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 824 * setting. The logic is a bit complicated; by default, unicast 825 * packets will follow path MTU while multicast packets will be sent at 826 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 827 * including unicast ones will be sent at the minimum MTU. Multicast 828 * packets will always be sent at the minimum MTU unless 829 * IP6PO_MINMTU_DISABLE is explicitly specified. 830 * See RFC 3542 for more details. 831 */ 832 if (mtu > IPV6_MMTU) { 833 if ((flags & IPV6_MINMTU)) 834 mtu = IPV6_MMTU; 835 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 836 mtu = IPV6_MMTU; 837 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 838 (opt == NULL || 839 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 840 mtu = IPV6_MMTU; 841 } 842 } 843 844 /* Fake scoped addresses */ 845 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 846 /* 847 * If source or destination address is a scoped address, and 848 * the packet is going to be sent to a loopback interface, 849 * we should keep the original interface. 850 */ 851 852 /* 853 * XXX: this is a very experimental and temporary solution. 854 * We eventually have sockaddr_in6 and use the sin6_scope_id 855 * field of the structure here. 856 * We rely on the consistency between two scope zone ids 857 * of source and destination, which should already be assured. 858 * Larger scopes than link will be supported in the future. 859 */ 860 origifp = NULL; 861 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 862 origifp = ifnet_byindex(ntohs(ip6->ip6_src.s6_addr16[1])); 863 else if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 864 origifp = ifnet_byindex(ntohs(ip6->ip6_dst.s6_addr16[1])); 865 /* 866 * XXX: origifp can be NULL even in those two cases above. 867 * For example, if we remove the (only) link-local address 868 * from the loopback interface, and try to send a link-local 869 * address without link-id information. Then the source 870 * address is ::1, and the destination address is the 871 * link-local address with its s6_addr16[1] being zero. 872 * What is worse, if the packet goes to the loopback interface 873 * by a default rejected route, the null pointer would be 874 * passed to looutput, and the kernel would hang. 875 * The following last resort would prevent such disaster. 876 */ 877 if (origifp == NULL) 878 origifp = ifp; 879 } 880 else 881 origifp = ifp; 882 /* 883 * clear embedded scope identifiers if necessary. 884 * in6_clearscope will touch the addresses only when necessary. 885 */ 886 in6_clearscope(&ip6->ip6_src); 887 in6_clearscope(&ip6->ip6_dst); 888 889 /* 890 * Check with the firewall... 891 */ 892 if (ip6_fw_enable && ip6_fw_chk_ptr) { 893 u_short port = 0; 894 m->m_pkthdr.rcvif = NULL; /* XXX */ 895 /* If ipfw says divert, we have to just drop packet */ 896 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 897 m_freem(m); 898 goto done; 899 } 900 if (!m) { 901 error = EACCES; 902 goto done; 903 } 904 } 905 906 /* 907 * If the outgoing packet contains a hop-by-hop options header, 908 * it must be examined and processed even by the source node. 909 * (RFC 2460, section 4.) 910 */ 911 if (exthdrs.ip6e_hbh) { 912 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 913 u_int32_t dummy; /* XXX unused */ 914 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 915 916 #ifdef DIAGNOSTIC 917 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 918 panic("ip6e_hbh is not continuous"); 919 #endif 920 /* 921 * XXX: if we have to send an ICMPv6 error to the sender, 922 * we need the M_LOOP flag since icmp6_error() expects 923 * the IPv6 and the hop-by-hop options header are 924 * continuous unless the flag is set. 925 */ 926 m->m_flags |= M_LOOP; 927 m->m_pkthdr.rcvif = ifp; 928 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 929 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 930 &dummy, &plen) < 0) { 931 /* m was already freed at this point */ 932 error = EINVAL;/* better error? */ 933 goto done; 934 } 935 m->m_flags &= ~M_LOOP; /* XXX */ 936 m->m_pkthdr.rcvif = NULL; 937 } 938 939 /* Jump over all PFIL processing if hooks are not active. */ 940 if (inet6_pfil_hook.ph_busy_count == -1) 941 goto passout; 942 943 odst = ip6->ip6_dst; 944 /* Run through list of hooks for output packets. */ 945 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 946 if (error != 0 || m == NULL) 947 goto done; 948 ip6 = mtod(m, struct ip6_hdr *); 949 950 /* See if destination IP address was changed by packet filter. */ 951 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 952 m->m_flags |= M_SKIP_FIREWALL; 953 /* If destination is now ourself drop to ip6_input(). */ 954 if (in6_localaddr(&ip6->ip6_dst)) { 955 if (m->m_pkthdr.rcvif == NULL) 956 m->m_pkthdr.rcvif = loif; 957 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 958 m->m_pkthdr.csum_flags |= 959 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 960 m->m_pkthdr.csum_data = 0xffff; 961 } 962 m->m_pkthdr.csum_flags |= 963 CSUM_IP_CHECKED | CSUM_IP_VALID; 964 error = netisr_queue(NETISR_IPV6, m); 965 goto done; 966 } else 967 goto again; /* Redo the routing table lookup. */ 968 } 969 970 /* XXX: IPFIREWALL_FORWARD */ 971 972 passout: 973 /* 974 * Send the packet to the outgoing interface. 975 * If necessary, do IPv6 fragmentation before sending. 976 * 977 * the logic here is rather complex: 978 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 979 * 1-a: send as is if tlen <= path mtu 980 * 1-b: fragment if tlen > path mtu 981 * 982 * 2: if user asks us not to fragment (dontfrag == 1) 983 * 2-a: send as is if tlen <= interface mtu 984 * 2-b: error if tlen > interface mtu 985 * 986 * 3: if we always need to attach fragment header (alwaysfrag == 1) 987 * always fragment 988 * 989 * 4: if dontfrag == 1 && alwaysfrag == 1 990 * error, as we cannot handle this conflicting request 991 */ 992 tlen = m->m_pkthdr.len; 993 994 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 995 dontfrag = 1; 996 else 997 dontfrag = 0; 998 if (dontfrag && alwaysfrag) { /* case 4 */ 999 /* conflicting request - can't transmit */ 1000 error = EMSGSIZE; 1001 goto bad; 1002 } 1003 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 1004 /* 1005 * Even if the DONTFRAG option is specified, we cannot send the 1006 * packet when the data length is larger than the MTU of the 1007 * outgoing interface. 1008 * Notify the error by sending IPV6_PATHMTU ancillary data as 1009 * well as returning an error code (the latter is not described 1010 * in the API spec.) 1011 */ 1012 u_int32_t mtu32; 1013 struct ip6ctlparam ip6cp; 1014 1015 mtu32 = (u_int32_t)mtu; 1016 bzero(&ip6cp, sizeof(ip6cp)); 1017 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1018 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1019 (void *)&ip6cp); 1020 1021 error = EMSGSIZE; 1022 goto bad; 1023 } 1024 1025 /* 1026 * transmit packet without fragmentation 1027 */ 1028 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 1029 struct in6_ifaddr *ia6; 1030 1031 ip6 = mtod(m, struct ip6_hdr *); 1032 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 1033 if (ia6) { 1034 /* Record statistics for this interface address. */ 1035 ia6->ia_ifa.if_opackets++; 1036 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 1037 } 1038 #ifdef IPSEC 1039 /* clean ipsec history once it goes out of the node */ 1040 ipsec_delaux(m); 1041 #endif 1042 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1043 goto done; 1044 } 1045 1046 /* 1047 * try to fragment the packet. case 1-b and 3 1048 */ 1049 if (mtu < IPV6_MMTU) { 1050 /* path MTU cannot be less than IPV6_MMTU */ 1051 error = EMSGSIZE; 1052 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1053 goto bad; 1054 } else if (ip6->ip6_plen == 0) { 1055 /* jumbo payload cannot be fragmented */ 1056 error = EMSGSIZE; 1057 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1058 goto bad; 1059 } else { 1060 struct mbuf **mnext, *m_frgpart; 1061 struct ip6_frag *ip6f; 1062 u_int32_t id = htonl(ip6_randomid()); 1063 u_char nextproto; 1064 #if 0 1065 struct ip6ctlparam ip6cp; 1066 u_int32_t mtu32; 1067 #endif 1068 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1069 1070 /* 1071 * Too large for the destination or interface; 1072 * fragment if possible. 1073 * Must be able to put at least 8 bytes per fragment. 1074 */ 1075 hlen = unfragpartlen; 1076 if (mtu > IPV6_MAXPACKET) 1077 mtu = IPV6_MAXPACKET; 1078 1079 #if 0 1080 /* 1081 * It is believed this code is a leftover from the 1082 * development of the IPV6_RECVPATHMTU sockopt and 1083 * associated work to implement RFC3542. 1084 * It's not entirely clear what the intent of the API 1085 * is at this point, so disable this code for now. 1086 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 1087 * will send notifications if the application requests. 1088 */ 1089 1090 /* Notify a proper path MTU to applications. */ 1091 mtu32 = (u_int32_t)mtu; 1092 bzero(&ip6cp, sizeof(ip6cp)); 1093 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1094 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1095 (void *)&ip6cp); 1096 #endif 1097 1098 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1099 if (len < 8) { 1100 error = EMSGSIZE; 1101 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1102 goto bad; 1103 } 1104 1105 /* 1106 * Verify that we have any chance at all of being able to queue 1107 * the packet or packet fragments 1108 */ 1109 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1110 < tlen /* - hlen */)) { 1111 error = ENOBUFS; 1112 ip6stat.ip6s_odropped++; 1113 goto bad; 1114 } 1115 1116 mnext = &m->m_nextpkt; 1117 1118 /* 1119 * Change the next header field of the last header in the 1120 * unfragmentable part. 1121 */ 1122 if (exthdrs.ip6e_rthdr) { 1123 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1124 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1125 } else if (exthdrs.ip6e_dest1) { 1126 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1127 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1128 } else if (exthdrs.ip6e_hbh) { 1129 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1130 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1131 } else { 1132 nextproto = ip6->ip6_nxt; 1133 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1134 } 1135 1136 /* 1137 * Loop through length of segment after first fragment, 1138 * make new header and copy data of each part and link onto 1139 * chain. 1140 */ 1141 m0 = m; 1142 for (off = hlen; off < tlen; off += len) { 1143 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1144 if (!m) { 1145 error = ENOBUFS; 1146 ip6stat.ip6s_odropped++; 1147 goto sendorfree; 1148 } 1149 m->m_pkthdr.rcvif = NULL; 1150 m->m_flags = m0->m_flags & M_COPYFLAGS; 1151 *mnext = m; 1152 mnext = &m->m_nextpkt; 1153 m->m_data += max_linkhdr; 1154 mhip6 = mtod(m, struct ip6_hdr *); 1155 *mhip6 = *ip6; 1156 m->m_len = sizeof(*mhip6); 1157 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1158 if (error) { 1159 ip6stat.ip6s_odropped++; 1160 goto sendorfree; 1161 } 1162 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1163 if (off + len >= tlen) 1164 len = tlen - off; 1165 else 1166 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1167 mhip6->ip6_plen = htons((u_short)(len + hlen + 1168 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1169 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1170 error = ENOBUFS; 1171 ip6stat.ip6s_odropped++; 1172 goto sendorfree; 1173 } 1174 m_cat(m, m_frgpart); 1175 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1176 m->m_pkthdr.rcvif = NULL; 1177 ip6f->ip6f_reserved = 0; 1178 ip6f->ip6f_ident = id; 1179 ip6f->ip6f_nxt = nextproto; 1180 ip6stat.ip6s_ofragments++; 1181 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1182 } 1183 1184 in6_ifstat_inc(ifp, ifs6_out_fragok); 1185 } 1186 1187 /* 1188 * Remove leading garbages. 1189 */ 1190 sendorfree: 1191 m = m0->m_nextpkt; 1192 m0->m_nextpkt = 0; 1193 m_freem(m0); 1194 for (m0 = m; m; m = m0) { 1195 m0 = m->m_nextpkt; 1196 m->m_nextpkt = 0; 1197 if (error == 0) { 1198 /* Record statistics for this interface address. */ 1199 if (ia) { 1200 ia->ia_ifa.if_opackets++; 1201 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1202 } 1203 #ifdef IPSEC 1204 /* clean ipsec history once it goes out of the node */ 1205 ipsec_delaux(m); 1206 #endif 1207 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1208 } else 1209 m_freem(m); 1210 } 1211 1212 if (error == 0) 1213 ip6stat.ip6s_fragmented++; 1214 1215 done: 1216 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1217 RTFREE(ro->ro_rt); 1218 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1219 RTFREE(ro_pmtu->ro_rt); 1220 } 1221 1222 #ifdef IPSEC 1223 if (sp != NULL) 1224 key_freesp(sp); 1225 #endif /* IPSEC */ 1226 #ifdef FAST_IPSEC 1227 if (sp != NULL) 1228 KEY_FREESP(&sp); 1229 #endif /* FAST_IPSEC */ 1230 1231 return (error); 1232 1233 freehdrs: 1234 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1235 m_freem(exthdrs.ip6e_dest1); 1236 m_freem(exthdrs.ip6e_rthdr); 1237 m_freem(exthdrs.ip6e_dest2); 1238 /* FALLTHROUGH */ 1239 bad: 1240 m_freem(m); 1241 goto done; 1242 } 1243 1244 static int 1245 ip6_copyexthdr(mp, hdr, hlen) 1246 struct mbuf **mp; 1247 caddr_t hdr; 1248 int hlen; 1249 { 1250 struct mbuf *m; 1251 1252 if (hlen > MCLBYTES) 1253 return (ENOBUFS); /* XXX */ 1254 1255 MGET(m, M_DONTWAIT, MT_DATA); 1256 if (!m) 1257 return (ENOBUFS); 1258 1259 if (hlen > MLEN) { 1260 MCLGET(m, M_DONTWAIT); 1261 if ((m->m_flags & M_EXT) == 0) { 1262 m_free(m); 1263 return (ENOBUFS); 1264 } 1265 } 1266 m->m_len = hlen; 1267 if (hdr) 1268 bcopy(hdr, mtod(m, caddr_t), hlen); 1269 1270 *mp = m; 1271 return (0); 1272 } 1273 1274 /* 1275 * Insert jumbo payload option. 1276 */ 1277 static int 1278 ip6_insert_jumboopt(exthdrs, plen) 1279 struct ip6_exthdrs *exthdrs; 1280 u_int32_t plen; 1281 { 1282 struct mbuf *mopt; 1283 u_char *optbuf; 1284 u_int32_t v; 1285 1286 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1287 1288 /* 1289 * If there is no hop-by-hop options header, allocate new one. 1290 * If there is one but it doesn't have enough space to store the 1291 * jumbo payload option, allocate a cluster to store the whole options. 1292 * Otherwise, use it to store the options. 1293 */ 1294 if (exthdrs->ip6e_hbh == 0) { 1295 MGET(mopt, M_DONTWAIT, MT_DATA); 1296 if (mopt == 0) 1297 return (ENOBUFS); 1298 mopt->m_len = JUMBOOPTLEN; 1299 optbuf = mtod(mopt, u_char *); 1300 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1301 exthdrs->ip6e_hbh = mopt; 1302 } else { 1303 struct ip6_hbh *hbh; 1304 1305 mopt = exthdrs->ip6e_hbh; 1306 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1307 /* 1308 * XXX assumption: 1309 * - exthdrs->ip6e_hbh is not referenced from places 1310 * other than exthdrs. 1311 * - exthdrs->ip6e_hbh is not an mbuf chain. 1312 */ 1313 int oldoptlen = mopt->m_len; 1314 struct mbuf *n; 1315 1316 /* 1317 * XXX: give up if the whole (new) hbh header does 1318 * not fit even in an mbuf cluster. 1319 */ 1320 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1321 return (ENOBUFS); 1322 1323 /* 1324 * As a consequence, we must always prepare a cluster 1325 * at this point. 1326 */ 1327 MGET(n, M_DONTWAIT, MT_DATA); 1328 if (n) { 1329 MCLGET(n, M_DONTWAIT); 1330 if ((n->m_flags & M_EXT) == 0) { 1331 m_freem(n); 1332 n = NULL; 1333 } 1334 } 1335 if (!n) 1336 return (ENOBUFS); 1337 n->m_len = oldoptlen + JUMBOOPTLEN; 1338 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1339 oldoptlen); 1340 optbuf = mtod(n, caddr_t) + oldoptlen; 1341 m_freem(mopt); 1342 mopt = exthdrs->ip6e_hbh = n; 1343 } else { 1344 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1345 mopt->m_len += JUMBOOPTLEN; 1346 } 1347 optbuf[0] = IP6OPT_PADN; 1348 optbuf[1] = 1; 1349 1350 /* 1351 * Adjust the header length according to the pad and 1352 * the jumbo payload option. 1353 */ 1354 hbh = mtod(mopt, struct ip6_hbh *); 1355 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1356 } 1357 1358 /* fill in the option. */ 1359 optbuf[2] = IP6OPT_JUMBO; 1360 optbuf[3] = 4; 1361 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1362 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1363 1364 /* finally, adjust the packet header length */ 1365 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1366 1367 return (0); 1368 #undef JUMBOOPTLEN 1369 } 1370 1371 /* 1372 * Insert fragment header and copy unfragmentable header portions. 1373 */ 1374 static int 1375 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1376 struct mbuf *m0, *m; 1377 int hlen; 1378 struct ip6_frag **frghdrp; 1379 { 1380 struct mbuf *n, *mlast; 1381 1382 if (hlen > sizeof(struct ip6_hdr)) { 1383 n = m_copym(m0, sizeof(struct ip6_hdr), 1384 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1385 if (n == 0) 1386 return (ENOBUFS); 1387 m->m_next = n; 1388 } else 1389 n = m; 1390 1391 /* Search for the last mbuf of unfragmentable part. */ 1392 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1393 ; 1394 1395 if ((mlast->m_flags & M_EXT) == 0 && 1396 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1397 /* use the trailing space of the last mbuf for the fragment hdr */ 1398 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1399 mlast->m_len); 1400 mlast->m_len += sizeof(struct ip6_frag); 1401 m->m_pkthdr.len += sizeof(struct ip6_frag); 1402 } else { 1403 /* allocate a new mbuf for the fragment header */ 1404 struct mbuf *mfrg; 1405 1406 MGET(mfrg, M_DONTWAIT, MT_DATA); 1407 if (mfrg == 0) 1408 return (ENOBUFS); 1409 mfrg->m_len = sizeof(struct ip6_frag); 1410 *frghdrp = mtod(mfrg, struct ip6_frag *); 1411 mlast->m_next = mfrg; 1412 } 1413 1414 return (0); 1415 } 1416 1417 static int 1418 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1419 struct route_in6 *ro_pmtu, *ro; 1420 struct ifnet *ifp; 1421 struct in6_addr *dst; 1422 u_long *mtup; 1423 int *alwaysfragp; 1424 { 1425 u_int32_t mtu = 0; 1426 int alwaysfrag = 0; 1427 int error = 0; 1428 1429 if (ro_pmtu != ro) { 1430 /* The first hop and the final destination may differ. */ 1431 struct sockaddr_in6 *sa6_dst = 1432 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1433 if (ro_pmtu->ro_rt && 1434 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1435 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1436 RTFREE(ro_pmtu->ro_rt); 1437 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1438 } 1439 if (ro_pmtu->ro_rt == NULL) { 1440 bzero(sa6_dst, sizeof(*sa6_dst)); 1441 sa6_dst->sin6_family = AF_INET6; 1442 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1443 sa6_dst->sin6_addr = *dst; 1444 1445 rtalloc((struct route *)ro_pmtu); 1446 } 1447 } 1448 if (ro_pmtu->ro_rt) { 1449 u_int32_t ifmtu; 1450 struct in_conninfo inc; 1451 1452 bzero(&inc, sizeof(inc)); 1453 inc.inc_flags = 1; /* IPv6 */ 1454 inc.inc6_faddr = *dst; 1455 1456 if (ifp == NULL) 1457 ifp = ro_pmtu->ro_rt->rt_ifp; 1458 ifmtu = IN6_LINKMTU(ifp); 1459 mtu = tcp_hc_getmtu(&inc); 1460 if (mtu) 1461 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1462 else 1463 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1464 if (mtu == 0) 1465 mtu = ifmtu; 1466 else if (mtu < IPV6_MMTU) { 1467 /* 1468 * RFC2460 section 5, last paragraph: 1469 * if we record ICMPv6 too big message with 1470 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1471 * or smaller, with framgent header attached. 1472 * (fragment header is needed regardless from the 1473 * packet size, for translators to identify packets) 1474 */ 1475 alwaysfrag = 1; 1476 mtu = IPV6_MMTU; 1477 } else if (mtu > ifmtu) { 1478 /* 1479 * The MTU on the route is larger than the MTU on 1480 * the interface! This shouldn't happen, unless the 1481 * MTU of the interface has been changed after the 1482 * interface was brought up. Change the MTU in the 1483 * route to match the interface MTU (as long as the 1484 * field isn't locked). 1485 */ 1486 mtu = ifmtu; 1487 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1488 } 1489 } else if (ifp) { 1490 mtu = IN6_LINKMTU(ifp); 1491 } else 1492 error = EHOSTUNREACH; /* XXX */ 1493 1494 *mtup = mtu; 1495 if (alwaysfragp) 1496 *alwaysfragp = alwaysfrag; 1497 return (error); 1498 } 1499 1500 /* 1501 * IP6 socket option processing. 1502 */ 1503 int 1504 ip6_ctloutput(so, sopt) 1505 struct socket *so; 1506 struct sockopt *sopt; 1507 { 1508 int privileged, optdatalen, uproto; 1509 void *optdata; 1510 struct inpcb *in6p = sotoinpcb(so); 1511 int error, optval; 1512 int level, op, optname; 1513 int optlen; 1514 struct thread *td; 1515 1516 if (sopt) { 1517 level = sopt->sopt_level; 1518 op = sopt->sopt_dir; 1519 optname = sopt->sopt_name; 1520 optlen = sopt->sopt_valsize; 1521 td = sopt->sopt_td; 1522 } else { 1523 panic("ip6_ctloutput: arg soopt is NULL"); 1524 } 1525 error = optval = 0; 1526 1527 privileged = (td == 0 || suser(td)) ? 0 : 1; 1528 uproto = (int)so->so_proto->pr_protocol; 1529 1530 if (level == IPPROTO_IPV6) { 1531 switch (op) { 1532 1533 case SOPT_SET: 1534 switch (optname) { 1535 case IPV6_2292PKTOPTIONS: 1536 #ifdef IPV6_PKTOPTIONS 1537 case IPV6_PKTOPTIONS: 1538 #endif 1539 { 1540 struct mbuf *m; 1541 1542 error = soopt_getm(sopt, &m); /* XXX */ 1543 if (error != 0) 1544 break; 1545 error = soopt_mcopyin(sopt, m); /* XXX */ 1546 if (error != 0) 1547 break; 1548 error = ip6_pcbopts(&in6p->in6p_outputopts, 1549 m, so, sopt); 1550 m_freem(m); /* XXX */ 1551 break; 1552 } 1553 1554 /* 1555 * Use of some Hop-by-Hop options or some 1556 * Destination options, might require special 1557 * privilege. That is, normal applications 1558 * (without special privilege) might be forbidden 1559 * from setting certain options in outgoing packets, 1560 * and might never see certain options in received 1561 * packets. [RFC 2292 Section 6] 1562 * KAME specific note: 1563 * KAME prevents non-privileged users from sending or 1564 * receiving ANY hbh/dst options in order to avoid 1565 * overhead of parsing options in the kernel. 1566 */ 1567 case IPV6_RECVHOPOPTS: 1568 case IPV6_RECVDSTOPTS: 1569 case IPV6_RECVRTHDRDSTOPTS: 1570 if (!privileged) { 1571 error = EPERM; 1572 break; 1573 } 1574 /* FALLTHROUGH */ 1575 case IPV6_UNICAST_HOPS: 1576 case IPV6_HOPLIMIT: 1577 case IPV6_FAITH: 1578 1579 case IPV6_RECVPKTINFO: 1580 case IPV6_RECVHOPLIMIT: 1581 case IPV6_RECVRTHDR: 1582 case IPV6_RECVPATHMTU: 1583 case IPV6_RECVTCLASS: 1584 case IPV6_V6ONLY: 1585 case IPV6_AUTOFLOWLABEL: 1586 if (optlen != sizeof(int)) { 1587 error = EINVAL; 1588 break; 1589 } 1590 error = sooptcopyin(sopt, &optval, 1591 sizeof optval, sizeof optval); 1592 if (error) 1593 break; 1594 switch (optname) { 1595 1596 case IPV6_UNICAST_HOPS: 1597 if (optval < -1 || optval >= 256) 1598 error = EINVAL; 1599 else { 1600 /* -1 = kernel default */ 1601 in6p->in6p_hops = optval; 1602 if ((in6p->in6p_vflag & 1603 INP_IPV4) != 0) 1604 in6p->inp_ip_ttl = optval; 1605 } 1606 break; 1607 #define OPTSET(bit) \ 1608 do { \ 1609 if (optval) \ 1610 in6p->in6p_flags |= (bit); \ 1611 else \ 1612 in6p->in6p_flags &= ~(bit); \ 1613 } while (/*CONSTCOND*/ 0) 1614 #define OPTSET2292(bit) \ 1615 do { \ 1616 in6p->in6p_flags |= IN6P_RFC2292; \ 1617 if (optval) \ 1618 in6p->in6p_flags |= (bit); \ 1619 else \ 1620 in6p->in6p_flags &= ~(bit); \ 1621 } while (/*CONSTCOND*/ 0) 1622 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1623 1624 case IPV6_RECVPKTINFO: 1625 /* cannot mix with RFC2292 */ 1626 if (OPTBIT(IN6P_RFC2292)) { 1627 error = EINVAL; 1628 break; 1629 } 1630 OPTSET(IN6P_PKTINFO); 1631 break; 1632 1633 case IPV6_HOPLIMIT: 1634 { 1635 struct ip6_pktopts **optp; 1636 1637 /* cannot mix with RFC2292 */ 1638 if (OPTBIT(IN6P_RFC2292)) { 1639 error = EINVAL; 1640 break; 1641 } 1642 optp = &in6p->in6p_outputopts; 1643 error = ip6_pcbopt(IPV6_HOPLIMIT, 1644 (u_char *)&optval, 1645 sizeof(optval), 1646 optp, 1647 privileged, uproto); 1648 break; 1649 } 1650 1651 case IPV6_RECVHOPLIMIT: 1652 /* cannot mix with RFC2292 */ 1653 if (OPTBIT(IN6P_RFC2292)) { 1654 error = EINVAL; 1655 break; 1656 } 1657 OPTSET(IN6P_HOPLIMIT); 1658 break; 1659 1660 case IPV6_RECVHOPOPTS: 1661 /* cannot mix with RFC2292 */ 1662 if (OPTBIT(IN6P_RFC2292)) { 1663 error = EINVAL; 1664 break; 1665 } 1666 OPTSET(IN6P_HOPOPTS); 1667 break; 1668 1669 case IPV6_RECVDSTOPTS: 1670 /* cannot mix with RFC2292 */ 1671 if (OPTBIT(IN6P_RFC2292)) { 1672 error = EINVAL; 1673 break; 1674 } 1675 OPTSET(IN6P_DSTOPTS); 1676 break; 1677 1678 case IPV6_RECVRTHDRDSTOPTS: 1679 /* cannot mix with RFC2292 */ 1680 if (OPTBIT(IN6P_RFC2292)) { 1681 error = EINVAL; 1682 break; 1683 } 1684 OPTSET(IN6P_RTHDRDSTOPTS); 1685 break; 1686 1687 case IPV6_RECVRTHDR: 1688 /* cannot mix with RFC2292 */ 1689 if (OPTBIT(IN6P_RFC2292)) { 1690 error = EINVAL; 1691 break; 1692 } 1693 OPTSET(IN6P_RTHDR); 1694 break; 1695 1696 case IPV6_FAITH: 1697 OPTSET(IN6P_FAITH); 1698 break; 1699 1700 case IPV6_RECVPATHMTU: 1701 /* 1702 * We ignore this option for TCP 1703 * sockets. 1704 * (RFC3542 leaves this case 1705 * unspecified.) 1706 */ 1707 if (uproto != IPPROTO_TCP) 1708 OPTSET(IN6P_MTU); 1709 break; 1710 1711 case IPV6_V6ONLY: 1712 /* 1713 * make setsockopt(IPV6_V6ONLY) 1714 * available only prior to bind(2). 1715 * see ipng mailing list, Jun 22 2001. 1716 */ 1717 if (in6p->in6p_lport || 1718 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1719 error = EINVAL; 1720 break; 1721 } 1722 OPTSET(IN6P_IPV6_V6ONLY); 1723 if (optval) 1724 in6p->in6p_vflag &= ~INP_IPV4; 1725 else 1726 in6p->in6p_vflag |= INP_IPV4; 1727 break; 1728 case IPV6_RECVTCLASS: 1729 /* cannot mix with RFC2292 XXX */ 1730 if (OPTBIT(IN6P_RFC2292)) { 1731 error = EINVAL; 1732 break; 1733 } 1734 OPTSET(IN6P_TCLASS); 1735 break; 1736 case IPV6_AUTOFLOWLABEL: 1737 OPTSET(IN6P_AUTOFLOWLABEL); 1738 break; 1739 1740 } 1741 break; 1742 1743 case IPV6_TCLASS: 1744 case IPV6_DONTFRAG: 1745 case IPV6_USE_MIN_MTU: 1746 case IPV6_PREFER_TEMPADDR: 1747 if (optlen != sizeof(optval)) { 1748 error = EINVAL; 1749 break; 1750 } 1751 error = sooptcopyin(sopt, &optval, 1752 sizeof optval, sizeof optval); 1753 if (error) 1754 break; 1755 { 1756 struct ip6_pktopts **optp; 1757 optp = &in6p->in6p_outputopts; 1758 error = ip6_pcbopt(optname, 1759 (u_char *)&optval, 1760 sizeof(optval), 1761 optp, 1762 privileged, uproto); 1763 break; 1764 } 1765 1766 case IPV6_2292PKTINFO: 1767 case IPV6_2292HOPLIMIT: 1768 case IPV6_2292HOPOPTS: 1769 case IPV6_2292DSTOPTS: 1770 case IPV6_2292RTHDR: 1771 /* RFC 2292 */ 1772 if (optlen != sizeof(int)) { 1773 error = EINVAL; 1774 break; 1775 } 1776 error = sooptcopyin(sopt, &optval, 1777 sizeof optval, sizeof optval); 1778 if (error) 1779 break; 1780 switch (optname) { 1781 case IPV6_2292PKTINFO: 1782 OPTSET2292(IN6P_PKTINFO); 1783 break; 1784 case IPV6_2292HOPLIMIT: 1785 OPTSET2292(IN6P_HOPLIMIT); 1786 break; 1787 case IPV6_2292HOPOPTS: 1788 /* 1789 * Check super-user privilege. 1790 * See comments for IPV6_RECVHOPOPTS. 1791 */ 1792 if (!privileged) 1793 return (EPERM); 1794 OPTSET2292(IN6P_HOPOPTS); 1795 break; 1796 case IPV6_2292DSTOPTS: 1797 if (!privileged) 1798 return (EPERM); 1799 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1800 break; 1801 case IPV6_2292RTHDR: 1802 OPTSET2292(IN6P_RTHDR); 1803 break; 1804 } 1805 break; 1806 case IPV6_PKTINFO: 1807 case IPV6_HOPOPTS: 1808 case IPV6_RTHDR: 1809 case IPV6_DSTOPTS: 1810 case IPV6_RTHDRDSTOPTS: 1811 case IPV6_NEXTHOP: 1812 { 1813 /* new advanced API (RFC3542) */ 1814 u_char *optbuf; 1815 int optlen; 1816 struct ip6_pktopts **optp; 1817 1818 /* cannot mix with RFC2292 */ 1819 if (OPTBIT(IN6P_RFC2292)) { 1820 error = EINVAL; 1821 break; 1822 } 1823 1824 switch (optname) { 1825 case IPV6_HOPOPTS: 1826 case IPV6_DSTOPTS: 1827 case IPV6_RTHDRDSTOPTS: 1828 case IPV6_NEXTHOP: 1829 if (!privileged) 1830 error = EPERM; 1831 break; 1832 } 1833 if (error) 1834 break; 1835 1836 switch (optname) { 1837 case IPV6_PKTINFO: 1838 optlen = sizeof(struct in6_pktinfo); 1839 break; 1840 case IPV6_NEXTHOP: 1841 optlen = SOCK_MAXADDRLEN; 1842 break; 1843 default: 1844 optlen = IPV6_MAXOPTHDR; 1845 break; 1846 } 1847 if (sopt->sopt_valsize > optlen) { 1848 error = EINVAL; 1849 break; 1850 } 1851 1852 optlen = sopt->sopt_valsize; 1853 optbuf = malloc(optlen, M_TEMP, M_WAITOK); 1854 error = sooptcopyin(sopt, optbuf, optlen, 1855 optlen); 1856 if (error) { 1857 free(optbuf, M_TEMP); 1858 break; 1859 } 1860 1861 optp = &in6p->in6p_outputopts; 1862 error = ip6_pcbopt(optname, 1863 optbuf, optlen, 1864 optp, privileged, uproto); 1865 free(optbuf, M_TEMP); 1866 break; 1867 } 1868 #undef OPTSET 1869 1870 case IPV6_MULTICAST_IF: 1871 case IPV6_MULTICAST_HOPS: 1872 case IPV6_MULTICAST_LOOP: 1873 case IPV6_JOIN_GROUP: 1874 case IPV6_LEAVE_GROUP: 1875 { 1876 if (sopt->sopt_valsize > MLEN) { 1877 error = EMSGSIZE; 1878 break; 1879 } 1880 /* XXX */ 1881 } 1882 /* FALLTHROUGH */ 1883 { 1884 struct mbuf *m; 1885 1886 if (sopt->sopt_valsize > MCLBYTES) { 1887 error = EMSGSIZE; 1888 break; 1889 } 1890 /* XXX */ 1891 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA); 1892 if (m == 0) { 1893 error = ENOBUFS; 1894 break; 1895 } 1896 if (sopt->sopt_valsize > MLEN) { 1897 MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT); 1898 if ((m->m_flags & M_EXT) == 0) { 1899 m_free(m); 1900 error = ENOBUFS; 1901 break; 1902 } 1903 } 1904 m->m_len = sopt->sopt_valsize; 1905 error = sooptcopyin(sopt, mtod(m, char *), 1906 m->m_len, m->m_len); 1907 if (error) { 1908 (void)m_free(m); 1909 break; 1910 } 1911 error = ip6_setmoptions(sopt->sopt_name, 1912 &in6p->in6p_moptions, 1913 m); 1914 (void)m_free(m); 1915 } 1916 break; 1917 1918 case IPV6_PORTRANGE: 1919 error = sooptcopyin(sopt, &optval, 1920 sizeof optval, sizeof optval); 1921 if (error) 1922 break; 1923 1924 switch (optval) { 1925 case IPV6_PORTRANGE_DEFAULT: 1926 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1927 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1928 break; 1929 1930 case IPV6_PORTRANGE_HIGH: 1931 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1932 in6p->in6p_flags |= IN6P_HIGHPORT; 1933 break; 1934 1935 case IPV6_PORTRANGE_LOW: 1936 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1937 in6p->in6p_flags |= IN6P_LOWPORT; 1938 break; 1939 1940 default: 1941 error = EINVAL; 1942 break; 1943 } 1944 break; 1945 1946 #if defined(IPSEC) || defined(FAST_IPSEC) 1947 case IPV6_IPSEC_POLICY: 1948 { 1949 caddr_t req = NULL; 1950 size_t len = 0; 1951 struct mbuf *m; 1952 1953 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1954 break; 1955 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1956 break; 1957 if (m) { 1958 req = mtod(m, caddr_t); 1959 len = m->m_len; 1960 } 1961 error = ipsec6_set_policy(in6p, optname, req, 1962 len, privileged); 1963 m_freem(m); 1964 } 1965 break; 1966 #endif /* KAME IPSEC */ 1967 1968 case IPV6_FW_ADD: 1969 case IPV6_FW_DEL: 1970 case IPV6_FW_FLUSH: 1971 case IPV6_FW_ZERO: 1972 { 1973 struct mbuf *m; 1974 struct mbuf **mp = &m; 1975 1976 if (ip6_fw_ctl_ptr == NULL) 1977 return EINVAL; 1978 /* XXX */ 1979 if ((error = soopt_getm(sopt, &m)) != 0) 1980 break; 1981 /* XXX */ 1982 if ((error = soopt_mcopyin(sopt, m)) != 0) 1983 break; 1984 error = (*ip6_fw_ctl_ptr)(optname, mp); 1985 m = *mp; 1986 } 1987 break; 1988 1989 default: 1990 error = ENOPROTOOPT; 1991 break; 1992 } 1993 break; 1994 1995 case SOPT_GET: 1996 switch (optname) { 1997 1998 case IPV6_2292PKTOPTIONS: 1999 #ifdef IPV6_PKTOPTIONS 2000 case IPV6_PKTOPTIONS: 2001 #endif 2002 /* 2003 * RFC3542 (effectively) deprecated the 2004 * semantics of the 2292-style pktoptions. 2005 * Since it was not reliable in nature (i.e., 2006 * applications had to expect the lack of some 2007 * information after all), it would make sense 2008 * to simplify this part by always returning 2009 * empty data. 2010 */ 2011 sopt->sopt_valsize = 0; 2012 break; 2013 2014 case IPV6_RECVHOPOPTS: 2015 case IPV6_RECVDSTOPTS: 2016 case IPV6_RECVRTHDRDSTOPTS: 2017 case IPV6_UNICAST_HOPS: 2018 case IPV6_RECVPKTINFO: 2019 case IPV6_RECVHOPLIMIT: 2020 case IPV6_RECVRTHDR: 2021 case IPV6_RECVPATHMTU: 2022 2023 case IPV6_FAITH: 2024 case IPV6_V6ONLY: 2025 case IPV6_PORTRANGE: 2026 case IPV6_RECVTCLASS: 2027 case IPV6_AUTOFLOWLABEL: 2028 switch (optname) { 2029 2030 case IPV6_RECVHOPOPTS: 2031 optval = OPTBIT(IN6P_HOPOPTS); 2032 break; 2033 2034 case IPV6_RECVDSTOPTS: 2035 optval = OPTBIT(IN6P_DSTOPTS); 2036 break; 2037 2038 case IPV6_RECVRTHDRDSTOPTS: 2039 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 2040 break; 2041 2042 case IPV6_UNICAST_HOPS: 2043 optval = in6p->in6p_hops; 2044 break; 2045 2046 case IPV6_RECVPKTINFO: 2047 optval = OPTBIT(IN6P_PKTINFO); 2048 break; 2049 2050 case IPV6_RECVHOPLIMIT: 2051 optval = OPTBIT(IN6P_HOPLIMIT); 2052 break; 2053 2054 case IPV6_RECVRTHDR: 2055 optval = OPTBIT(IN6P_RTHDR); 2056 break; 2057 2058 case IPV6_RECVPATHMTU: 2059 optval = OPTBIT(IN6P_MTU); 2060 break; 2061 2062 case IPV6_FAITH: 2063 optval = OPTBIT(IN6P_FAITH); 2064 break; 2065 2066 case IPV6_V6ONLY: 2067 optval = OPTBIT(IN6P_IPV6_V6ONLY); 2068 break; 2069 2070 case IPV6_PORTRANGE: 2071 { 2072 int flags; 2073 flags = in6p->in6p_flags; 2074 if (flags & IN6P_HIGHPORT) 2075 optval = IPV6_PORTRANGE_HIGH; 2076 else if (flags & IN6P_LOWPORT) 2077 optval = IPV6_PORTRANGE_LOW; 2078 else 2079 optval = 0; 2080 break; 2081 } 2082 case IPV6_RECVTCLASS: 2083 optval = OPTBIT(IN6P_TCLASS); 2084 break; 2085 2086 case IPV6_AUTOFLOWLABEL: 2087 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2088 break; 2089 } 2090 if (error) 2091 break; 2092 error = sooptcopyout(sopt, &optval, 2093 sizeof optval); 2094 break; 2095 2096 case IPV6_PATHMTU: 2097 { 2098 u_long pmtu = 0; 2099 struct ip6_mtuinfo mtuinfo; 2100 struct route_in6 sro; 2101 2102 bzero(&sro, sizeof(sro)); 2103 2104 if (!(so->so_state & SS_ISCONNECTED)) 2105 return (ENOTCONN); 2106 /* 2107 * XXX: we dot not consider the case of source 2108 * routing, or optional information to specify 2109 * the outgoing interface. 2110 */ 2111 error = ip6_getpmtu(&sro, NULL, NULL, 2112 &in6p->in6p_faddr, &pmtu, NULL); 2113 if (sro.ro_rt) 2114 RTFREE(sro.ro_rt); 2115 if (error) 2116 break; 2117 if (pmtu > IPV6_MAXPACKET) 2118 pmtu = IPV6_MAXPACKET; 2119 2120 bzero(&mtuinfo, sizeof(mtuinfo)); 2121 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2122 optdata = (void *)&mtuinfo; 2123 optdatalen = sizeof(mtuinfo); 2124 error = sooptcopyout(sopt, optdata, 2125 optdatalen); 2126 break; 2127 } 2128 2129 case IPV6_2292PKTINFO: 2130 case IPV6_2292HOPLIMIT: 2131 case IPV6_2292HOPOPTS: 2132 case IPV6_2292RTHDR: 2133 case IPV6_2292DSTOPTS: 2134 switch (optname) { 2135 case IPV6_2292PKTINFO: 2136 optval = OPTBIT(IN6P_PKTINFO); 2137 break; 2138 case IPV6_2292HOPLIMIT: 2139 optval = OPTBIT(IN6P_HOPLIMIT); 2140 break; 2141 case IPV6_2292HOPOPTS: 2142 optval = OPTBIT(IN6P_HOPOPTS); 2143 break; 2144 case IPV6_2292RTHDR: 2145 optval = OPTBIT(IN6P_RTHDR); 2146 break; 2147 case IPV6_2292DSTOPTS: 2148 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2149 break; 2150 } 2151 error = sooptcopyout(sopt, &optval, 2152 sizeof optval); 2153 break; 2154 case IPV6_PKTINFO: 2155 case IPV6_HOPOPTS: 2156 case IPV6_RTHDR: 2157 case IPV6_DSTOPTS: 2158 case IPV6_RTHDRDSTOPTS: 2159 case IPV6_NEXTHOP: 2160 case IPV6_TCLASS: 2161 case IPV6_DONTFRAG: 2162 case IPV6_USE_MIN_MTU: 2163 case IPV6_PREFER_TEMPADDR: 2164 error = ip6_getpcbopt(in6p->in6p_outputopts, 2165 optname, sopt); 2166 break; 2167 2168 case IPV6_MULTICAST_IF: 2169 case IPV6_MULTICAST_HOPS: 2170 case IPV6_MULTICAST_LOOP: 2171 case IPV6_JOIN_GROUP: 2172 case IPV6_LEAVE_GROUP: 2173 { 2174 struct mbuf *m; 2175 error = ip6_getmoptions(sopt->sopt_name, 2176 in6p->in6p_moptions, &m); 2177 if (error == 0) 2178 error = sooptcopyout(sopt, 2179 mtod(m, char *), m->m_len); 2180 m_freem(m); 2181 } 2182 break; 2183 2184 #if defined(IPSEC) || defined(FAST_IPSEC) 2185 case IPV6_IPSEC_POLICY: 2186 { 2187 caddr_t req = NULL; 2188 size_t len = 0; 2189 struct mbuf *m = NULL; 2190 struct mbuf **mp = &m; 2191 size_t ovalsize = sopt->sopt_valsize; 2192 caddr_t oval = (caddr_t)sopt->sopt_val; 2193 2194 error = soopt_getm(sopt, &m); /* XXX */ 2195 if (error != 0) 2196 break; 2197 error = soopt_mcopyin(sopt, m); /* XXX */ 2198 if (error != 0) 2199 break; 2200 sopt->sopt_valsize = ovalsize; 2201 sopt->sopt_val = oval; 2202 if (m) { 2203 req = mtod(m, caddr_t); 2204 len = m->m_len; 2205 } 2206 error = ipsec6_get_policy(in6p, req, len, mp); 2207 if (error == 0) 2208 error = soopt_mcopyout(sopt, m); /* XXX */ 2209 if (error == 0 && m) 2210 m_freem(m); 2211 break; 2212 } 2213 #endif /* KAME IPSEC */ 2214 2215 case IPV6_FW_GET: 2216 { 2217 struct mbuf *m; 2218 struct mbuf **mp = &m; 2219 2220 if (ip6_fw_ctl_ptr == NULL) 2221 { 2222 return EINVAL; 2223 } 2224 error = (*ip6_fw_ctl_ptr)(optname, mp); 2225 if (error == 0) 2226 error = soopt_mcopyout(sopt, m); /* XXX */ 2227 if (error == 0 && m) 2228 m_freem(m); 2229 } 2230 break; 2231 2232 default: 2233 error = ENOPROTOOPT; 2234 break; 2235 } 2236 break; 2237 } 2238 } else { /* level != IPPROTO_IPV6 */ 2239 error = EINVAL; 2240 } 2241 return (error); 2242 } 2243 2244 int 2245 ip6_raw_ctloutput(so, sopt) 2246 struct socket *so; 2247 struct sockopt *sopt; 2248 { 2249 int error = 0, optval, optlen; 2250 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2251 struct in6pcb *in6p = sotoin6pcb(so); 2252 int level, op, optname; 2253 2254 if (sopt) { 2255 level = sopt->sopt_level; 2256 op = sopt->sopt_dir; 2257 optname = sopt->sopt_name; 2258 optlen = sopt->sopt_valsize; 2259 } else 2260 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2261 2262 if (level != IPPROTO_IPV6) { 2263 return (EINVAL); 2264 } 2265 2266 switch (optname) { 2267 case IPV6_CHECKSUM: 2268 /* 2269 * For ICMPv6 sockets, no modification allowed for checksum 2270 * offset, permit "no change" values to help existing apps. 2271 * 2272 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2273 * for an ICMPv6 socket will fail." 2274 * The current behavior does not meet RFC3542. 2275 */ 2276 switch (op) { 2277 case SOPT_SET: 2278 if (optlen != sizeof(int)) { 2279 error = EINVAL; 2280 break; 2281 } 2282 error = sooptcopyin(sopt, &optval, sizeof(optval), 2283 sizeof(optval)); 2284 if (error) 2285 break; 2286 if ((optval % 2) != 0) { 2287 /* the API assumes even offset values */ 2288 error = EINVAL; 2289 } else if (so->so_proto->pr_protocol == 2290 IPPROTO_ICMPV6) { 2291 if (optval != icmp6off) 2292 error = EINVAL; 2293 } else 2294 in6p->in6p_cksum = optval; 2295 break; 2296 2297 case SOPT_GET: 2298 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2299 optval = icmp6off; 2300 else 2301 optval = in6p->in6p_cksum; 2302 2303 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2304 break; 2305 2306 default: 2307 error = EINVAL; 2308 break; 2309 } 2310 break; 2311 2312 default: 2313 error = ENOPROTOOPT; 2314 break; 2315 } 2316 2317 return (error); 2318 } 2319 2320 /* 2321 * Set up IP6 options in pcb for insertion in output packets or 2322 * specifying behavior of outgoing packets. 2323 */ 2324 static int 2325 ip6_pcbopts(pktopt, m, so, sopt) 2326 struct ip6_pktopts **pktopt; 2327 struct mbuf *m; 2328 struct socket *so; 2329 struct sockopt *sopt; 2330 { 2331 struct ip6_pktopts *opt = *pktopt; 2332 int error = 0; 2333 struct thread *td = sopt->sopt_td; 2334 int priv = 0; 2335 2336 /* turn off any old options. */ 2337 if (opt) { 2338 #ifdef DIAGNOSTIC 2339 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2340 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2341 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2342 printf("ip6_pcbopts: all specified options are cleared.\n"); 2343 #endif 2344 ip6_clearpktopts(opt, -1); 2345 } else 2346 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2347 *pktopt = NULL; 2348 2349 if (!m || m->m_len == 0) { 2350 /* 2351 * Only turning off any previous options, regardless of 2352 * whether the opt is just created or given. 2353 */ 2354 free(opt, M_IP6OPT); 2355 return (0); 2356 } 2357 2358 /* set options specified by user. */ 2359 if (td && !suser(td)) 2360 priv = 1; 2361 if ((error = ip6_setpktopts(m, opt, NULL, priv, 1, 2362 so->so_proto->pr_protocol)) != 0) { 2363 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2364 free(opt, M_IP6OPT); 2365 return (error); 2366 } 2367 *pktopt = opt; 2368 return (0); 2369 } 2370 2371 /* 2372 * initialize ip6_pktopts. beware that there are non-zero default values in 2373 * the struct. 2374 */ 2375 void 2376 ip6_initpktopts(opt) 2377 struct ip6_pktopts *opt; 2378 { 2379 2380 bzero(opt, sizeof(*opt)); 2381 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2382 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2383 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2384 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2385 } 2386 2387 static int 2388 ip6_pcbopt(optname, buf, len, pktopt, priv, uproto) 2389 int optname, len, priv; 2390 u_char *buf; 2391 struct ip6_pktopts **pktopt; 2392 int uproto; 2393 { 2394 struct ip6_pktopts *opt; 2395 2396 if (*pktopt == NULL) { 2397 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2398 M_WAITOK); 2399 ip6_initpktopts(*pktopt); 2400 (*pktopt)->needfree = 1; 2401 } 2402 opt = *pktopt; 2403 2404 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2405 } 2406 2407 static int 2408 ip6_getpcbopt(pktopt, optname, sopt) 2409 struct ip6_pktopts *pktopt; 2410 struct sockopt *sopt; 2411 int optname; 2412 { 2413 void *optdata = NULL; 2414 int optdatalen = 0; 2415 struct ip6_ext *ip6e; 2416 int error = 0; 2417 struct in6_pktinfo null_pktinfo; 2418 int deftclass = 0, on; 2419 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2420 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2421 2422 switch (optname) { 2423 case IPV6_PKTINFO: 2424 if (pktopt && pktopt->ip6po_pktinfo) 2425 optdata = (void *)pktopt->ip6po_pktinfo; 2426 else { 2427 /* XXX: we don't have to do this every time... */ 2428 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2429 optdata = (void *)&null_pktinfo; 2430 } 2431 optdatalen = sizeof(struct in6_pktinfo); 2432 break; 2433 case IPV6_TCLASS: 2434 if (pktopt && pktopt->ip6po_tclass >= 0) 2435 optdata = (void *)&pktopt->ip6po_tclass; 2436 else 2437 optdata = (void *)&deftclass; 2438 optdatalen = sizeof(int); 2439 break; 2440 case IPV6_HOPOPTS: 2441 if (pktopt && pktopt->ip6po_hbh) { 2442 optdata = (void *)pktopt->ip6po_hbh; 2443 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2444 optdatalen = (ip6e->ip6e_len + 1) << 3; 2445 } 2446 break; 2447 case IPV6_RTHDR: 2448 if (pktopt && pktopt->ip6po_rthdr) { 2449 optdata = (void *)pktopt->ip6po_rthdr; 2450 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2451 optdatalen = (ip6e->ip6e_len + 1) << 3; 2452 } 2453 break; 2454 case IPV6_RTHDRDSTOPTS: 2455 if (pktopt && pktopt->ip6po_dest1) { 2456 optdata = (void *)pktopt->ip6po_dest1; 2457 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2458 optdatalen = (ip6e->ip6e_len + 1) << 3; 2459 } 2460 break; 2461 case IPV6_DSTOPTS: 2462 if (pktopt && pktopt->ip6po_dest2) { 2463 optdata = (void *)pktopt->ip6po_dest2; 2464 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2465 optdatalen = (ip6e->ip6e_len + 1) << 3; 2466 } 2467 break; 2468 case IPV6_NEXTHOP: 2469 if (pktopt && pktopt->ip6po_nexthop) { 2470 optdata = (void *)pktopt->ip6po_nexthop; 2471 optdatalen = pktopt->ip6po_nexthop->sa_len; 2472 } 2473 break; 2474 case IPV6_USE_MIN_MTU: 2475 if (pktopt) 2476 optdata = (void *)&pktopt->ip6po_minmtu; 2477 else 2478 optdata = (void *)&defminmtu; 2479 optdatalen = sizeof(int); 2480 break; 2481 case IPV6_DONTFRAG: 2482 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2483 on = 1; 2484 else 2485 on = 0; 2486 optdata = (void *)&on; 2487 optdatalen = sizeof(on); 2488 break; 2489 case IPV6_PREFER_TEMPADDR: 2490 if (pktopt) 2491 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2492 else 2493 optdata = (void *)&defpreftemp; 2494 optdatalen = sizeof(int); 2495 break; 2496 default: /* should not happen */ 2497 #ifdef DIAGNOSTIC 2498 panic("ip6_getpcbopt: unexpected option\n"); 2499 #endif 2500 return (ENOPROTOOPT); 2501 } 2502 2503 error = sooptcopyout(sopt, optdata, optdatalen); 2504 2505 return (error); 2506 } 2507 2508 void 2509 ip6_clearpktopts(pktopt, optname) 2510 struct ip6_pktopts *pktopt; 2511 int optname; 2512 { 2513 int needfree; 2514 2515 if (pktopt == NULL) 2516 return; 2517 2518 needfree = pktopt->needfree; 2519 2520 if (optname == -1 || optname == IPV6_PKTINFO) { 2521 if (needfree && pktopt->ip6po_pktinfo) 2522 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2523 pktopt->ip6po_pktinfo = NULL; 2524 } 2525 if (optname == -1 || optname == IPV6_HOPLIMIT) 2526 pktopt->ip6po_hlim = -1; 2527 if (optname == -1 || optname == IPV6_TCLASS) 2528 pktopt->ip6po_tclass = -1; 2529 if (optname == -1 || optname == IPV6_NEXTHOP) { 2530 if (pktopt->ip6po_nextroute.ro_rt) { 2531 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2532 pktopt->ip6po_nextroute.ro_rt = NULL; 2533 } 2534 if (needfree && pktopt->ip6po_nexthop) 2535 free(pktopt->ip6po_nexthop, M_IP6OPT); 2536 pktopt->ip6po_nexthop = NULL; 2537 } 2538 if (optname == -1 || optname == IPV6_HOPOPTS) { 2539 if (needfree && pktopt->ip6po_hbh) 2540 free(pktopt->ip6po_hbh, M_IP6OPT); 2541 pktopt->ip6po_hbh = NULL; 2542 } 2543 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2544 if (needfree && pktopt->ip6po_dest1) 2545 free(pktopt->ip6po_dest1, M_IP6OPT); 2546 pktopt->ip6po_dest1 = NULL; 2547 } 2548 if (optname == -1 || optname == IPV6_RTHDR) { 2549 if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2550 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2551 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2552 if (pktopt->ip6po_route.ro_rt) { 2553 RTFREE(pktopt->ip6po_route.ro_rt); 2554 pktopt->ip6po_route.ro_rt = NULL; 2555 } 2556 } 2557 if (optname == -1 || optname == IPV6_DSTOPTS) { 2558 if (needfree && pktopt->ip6po_dest2) 2559 free(pktopt->ip6po_dest2, M_IP6OPT); 2560 pktopt->ip6po_dest2 = NULL; 2561 } 2562 } 2563 2564 #define PKTOPT_EXTHDRCPY(type) \ 2565 do {\ 2566 if (src->type) {\ 2567 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2568 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2569 if (dst->type == NULL && canwait == M_NOWAIT)\ 2570 goto bad;\ 2571 bcopy(src->type, dst->type, hlen);\ 2572 }\ 2573 } while (/*CONSTCOND*/ 0) 2574 2575 struct ip6_pktopts * 2576 ip6_copypktopts(src, canwait) 2577 struct ip6_pktopts *src; 2578 int canwait; 2579 { 2580 struct ip6_pktopts *dst; 2581 2582 if (src == NULL) { 2583 printf("ip6_clearpktopts: invalid argument\n"); 2584 return (NULL); 2585 } 2586 2587 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2588 if (dst == NULL && canwait == M_NOWAIT) 2589 return (NULL); 2590 bzero(dst, sizeof(*dst)); 2591 dst->needfree = 1; 2592 2593 dst->ip6po_hlim = src->ip6po_hlim; 2594 dst->ip6po_tclass = src->ip6po_tclass; 2595 dst->ip6po_flags = src->ip6po_flags; 2596 if (src->ip6po_pktinfo) { 2597 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2598 M_IP6OPT, canwait); 2599 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2600 goto bad; 2601 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2602 } 2603 if (src->ip6po_nexthop) { 2604 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2605 M_IP6OPT, canwait); 2606 if (dst->ip6po_nexthop == NULL) 2607 goto bad; 2608 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2609 src->ip6po_nexthop->sa_len); 2610 } 2611 PKTOPT_EXTHDRCPY(ip6po_hbh); 2612 PKTOPT_EXTHDRCPY(ip6po_dest1); 2613 PKTOPT_EXTHDRCPY(ip6po_dest2); 2614 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2615 return (dst); 2616 2617 bad: 2618 if (dst->ip6po_pktinfo) free(dst->ip6po_pktinfo, M_IP6OPT); 2619 if (dst->ip6po_nexthop) free(dst->ip6po_nexthop, M_IP6OPT); 2620 if (dst->ip6po_hbh) free(dst->ip6po_hbh, M_IP6OPT); 2621 if (dst->ip6po_dest1) free(dst->ip6po_dest1, M_IP6OPT); 2622 if (dst->ip6po_dest2) free(dst->ip6po_dest2, M_IP6OPT); 2623 if (dst->ip6po_rthdr) free(dst->ip6po_rthdr, M_IP6OPT); 2624 free(dst, M_IP6OPT); 2625 return (NULL); 2626 } 2627 #undef PKTOPT_EXTHDRCPY 2628 2629 void 2630 ip6_freepcbopts(pktopt) 2631 struct ip6_pktopts *pktopt; 2632 { 2633 if (pktopt == NULL) 2634 return; 2635 2636 ip6_clearpktopts(pktopt, -1); 2637 2638 free(pktopt, M_IP6OPT); 2639 } 2640 2641 /* 2642 * Set the IP6 multicast options in response to user setsockopt(). 2643 */ 2644 static int 2645 ip6_setmoptions(optname, im6op, m) 2646 int optname; 2647 struct ip6_moptions **im6op; 2648 struct mbuf *m; 2649 { 2650 int error = 0; 2651 u_int loop, ifindex; 2652 struct ipv6_mreq *mreq; 2653 struct ifnet *ifp; 2654 struct ip6_moptions *im6o = *im6op; 2655 struct route_in6 ro; 2656 struct sockaddr_in6 *dst; 2657 struct in6_multi_mship *imm; 2658 struct thread *td = curthread; 2659 2660 if (im6o == NULL) { 2661 /* 2662 * No multicast option buffer attached to the pcb; 2663 * allocate one and initialize to default values. 2664 */ 2665 im6o = (struct ip6_moptions *) 2666 malloc(sizeof(*im6o), M_IPMOPTS, M_WAITOK); 2667 2668 if (im6o == NULL) 2669 return (ENOBUFS); 2670 *im6op = im6o; 2671 im6o->im6o_multicast_ifp = NULL; 2672 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2673 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2674 LIST_INIT(&im6o->im6o_memberships); 2675 } 2676 2677 switch (optname) { 2678 2679 case IPV6_MULTICAST_IF: 2680 /* 2681 * Select the interface for outgoing multicast packets. 2682 */ 2683 if (m == NULL || m->m_len != sizeof(u_int)) { 2684 error = EINVAL; 2685 break; 2686 } 2687 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2688 if (ifindex < 0 || if_index < ifindex) { 2689 error = ENXIO; /* XXX EINVAL? */ 2690 break; 2691 } 2692 ifp = ifnet_byindex(ifindex); 2693 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2694 error = EADDRNOTAVAIL; 2695 break; 2696 } 2697 im6o->im6o_multicast_ifp = ifp; 2698 break; 2699 2700 case IPV6_MULTICAST_HOPS: 2701 { 2702 /* 2703 * Set the IP6 hoplimit for outgoing multicast packets. 2704 */ 2705 int optval; 2706 if (m == NULL || m->m_len != sizeof(int)) { 2707 error = EINVAL; 2708 break; 2709 } 2710 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2711 if (optval < -1 || optval >= 256) 2712 error = EINVAL; 2713 else if (optval == -1) 2714 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2715 else 2716 im6o->im6o_multicast_hlim = optval; 2717 break; 2718 } 2719 2720 case IPV6_MULTICAST_LOOP: 2721 /* 2722 * Set the loopback flag for outgoing multicast packets. 2723 * Must be zero or one. 2724 */ 2725 if (m == NULL || m->m_len != sizeof(u_int)) { 2726 error = EINVAL; 2727 break; 2728 } 2729 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2730 if (loop > 1) { 2731 error = EINVAL; 2732 break; 2733 } 2734 im6o->im6o_multicast_loop = loop; 2735 break; 2736 2737 case IPV6_JOIN_GROUP: 2738 /* 2739 * Add a multicast group membership. 2740 * Group must be a valid IP6 multicast address. 2741 */ 2742 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2743 error = EINVAL; 2744 break; 2745 } 2746 mreq = mtod(m, struct ipv6_mreq *); 2747 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2748 /* 2749 * We use the unspecified address to specify to accept 2750 * all multicast addresses. Only super user is allowed 2751 * to do this. 2752 */ 2753 if (suser(td)) { 2754 error = EACCES; 2755 break; 2756 } 2757 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2758 error = EINVAL; 2759 break; 2760 } 2761 2762 /* 2763 * If the interface is specified, validate it. 2764 */ 2765 if (mreq->ipv6mr_interface < 0 || 2766 if_index < mreq->ipv6mr_interface) { 2767 error = ENXIO; /* XXX EINVAL? */ 2768 break; 2769 } 2770 /* 2771 * If no interface was explicitly specified, choose an 2772 * appropriate one according to the given multicast address. 2773 */ 2774 if (mreq->ipv6mr_interface == 0) { 2775 /* 2776 * If the multicast address is in node-local scope, 2777 * the interface should be a loopback interface. 2778 * Otherwise, look up the routing table for the 2779 * address, and choose the outgoing interface. 2780 * XXX: is it a good approach? 2781 */ 2782 if (IN6_IS_ADDR_MC_INTFACELOCAL(&mreq->ipv6mr_multiaddr)) { 2783 ifp = &loif[0]; 2784 } else { 2785 ro.ro_rt = NULL; 2786 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2787 bzero(dst, sizeof(*dst)); 2788 dst->sin6_len = sizeof(struct sockaddr_in6); 2789 dst->sin6_family = AF_INET6; 2790 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2791 rtalloc((struct route *)&ro); 2792 if (ro.ro_rt == NULL) { 2793 error = EADDRNOTAVAIL; 2794 break; 2795 } 2796 ifp = ro.ro_rt->rt_ifp; 2797 RTFREE(ro.ro_rt); 2798 } 2799 } else 2800 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2801 2802 /* 2803 * See if we found an interface, and confirm that it 2804 * supports multicast 2805 */ 2806 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2807 error = EADDRNOTAVAIL; 2808 break; 2809 } 2810 /* 2811 * Put interface index into the multicast address, 2812 * if the address has link-local scope. 2813 */ 2814 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2815 mreq->ipv6mr_multiaddr.s6_addr16[1] = 2816 htons(ifp->if_index); 2817 } 2818 /* 2819 * See if the membership already exists. 2820 */ 2821 for (imm = im6o->im6o_memberships.lh_first; 2822 imm != NULL; imm = imm->i6mm_chain.le_next) 2823 if (imm->i6mm_maddr->in6m_ifp == ifp && 2824 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2825 &mreq->ipv6mr_multiaddr)) 2826 break; 2827 if (imm != NULL) { 2828 error = EADDRINUSE; 2829 break; 2830 } 2831 /* 2832 * Everything looks good; add a new record to the multicast 2833 * address list for the given interface. 2834 */ 2835 imm = malloc(sizeof(*imm), M_IPMADDR, M_WAITOK); 2836 if (imm == NULL) { 2837 error = ENOBUFS; 2838 break; 2839 } 2840 if ((imm->i6mm_maddr = 2841 in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { 2842 free(imm, M_IPMADDR); 2843 break; 2844 } 2845 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2846 break; 2847 2848 case IPV6_LEAVE_GROUP: 2849 /* 2850 * Drop a multicast group membership. 2851 * Group must be a valid IP6 multicast address. 2852 */ 2853 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2854 error = EINVAL; 2855 break; 2856 } 2857 mreq = mtod(m, struct ipv6_mreq *); 2858 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2859 if (suser(td)) { 2860 error = EACCES; 2861 break; 2862 } 2863 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2864 error = EINVAL; 2865 break; 2866 } 2867 /* 2868 * If an interface address was specified, get a pointer 2869 * to its ifnet structure. 2870 */ 2871 if (mreq->ipv6mr_interface < 0 2872 || if_index < mreq->ipv6mr_interface) { 2873 error = ENXIO; /* XXX EINVAL? */ 2874 break; 2875 } 2876 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2877 /* 2878 * Put interface index into the multicast address, 2879 * if the address has link-local scope. 2880 */ 2881 if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { 2882 mreq->ipv6mr_multiaddr.s6_addr16[1] 2883 = htons(mreq->ipv6mr_interface); 2884 } 2885 2886 /* 2887 * Find the membership in the membership list. 2888 */ 2889 for (imm = im6o->im6o_memberships.lh_first; 2890 imm != NULL; imm = imm->i6mm_chain.le_next) { 2891 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2892 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2893 &mreq->ipv6mr_multiaddr)) 2894 break; 2895 } 2896 if (imm == NULL) { 2897 /* Unable to resolve interface */ 2898 error = EADDRNOTAVAIL; 2899 break; 2900 } 2901 /* 2902 * Give up the multicast address record to which the 2903 * membership points. 2904 */ 2905 LIST_REMOVE(imm, i6mm_chain); 2906 in6_delmulti(imm->i6mm_maddr); 2907 free(imm, M_IPMADDR); 2908 break; 2909 2910 default: 2911 error = EOPNOTSUPP; 2912 break; 2913 } 2914 2915 /* 2916 * If all options have default values, no need to keep the mbuf. 2917 */ 2918 if (im6o->im6o_multicast_ifp == NULL && 2919 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2920 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2921 im6o->im6o_memberships.lh_first == NULL) { 2922 free(*im6op, M_IPMOPTS); 2923 *im6op = NULL; 2924 } 2925 2926 return (error); 2927 } 2928 2929 /* 2930 * Return the IP6 multicast options in response to user getsockopt(). 2931 */ 2932 static int 2933 ip6_getmoptions(optname, im6o, mp) 2934 int optname; 2935 struct ip6_moptions *im6o; 2936 struct mbuf **mp; 2937 { 2938 u_int *hlim, *loop, *ifindex; 2939 2940 *mp = m_get(M_TRYWAIT, MT_HEADER); /* XXX */ 2941 2942 switch (optname) { 2943 2944 case IPV6_MULTICAST_IF: 2945 ifindex = mtod(*mp, u_int *); 2946 (*mp)->m_len = sizeof(u_int); 2947 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2948 *ifindex = 0; 2949 else 2950 *ifindex = im6o->im6o_multicast_ifp->if_index; 2951 return (0); 2952 2953 case IPV6_MULTICAST_HOPS: 2954 hlim = mtod(*mp, u_int *); 2955 (*mp)->m_len = sizeof(u_int); 2956 if (im6o == NULL) 2957 *hlim = ip6_defmcasthlim; 2958 else 2959 *hlim = im6o->im6o_multicast_hlim; 2960 return (0); 2961 2962 case IPV6_MULTICAST_LOOP: 2963 loop = mtod(*mp, u_int *); 2964 (*mp)->m_len = sizeof(u_int); 2965 if (im6o == NULL) 2966 *loop = ip6_defmcasthlim; 2967 else 2968 *loop = im6o->im6o_multicast_loop; 2969 return (0); 2970 2971 default: 2972 return (EOPNOTSUPP); 2973 } 2974 } 2975 2976 /* 2977 * Discard the IP6 multicast options. 2978 */ 2979 void 2980 ip6_freemoptions(im6o) 2981 struct ip6_moptions *im6o; 2982 { 2983 struct in6_multi_mship *imm; 2984 2985 if (im6o == NULL) 2986 return; 2987 2988 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2989 LIST_REMOVE(imm, i6mm_chain); 2990 if (imm->i6mm_maddr) 2991 in6_delmulti(imm->i6mm_maddr); 2992 free(imm, M_IPMADDR); 2993 } 2994 free(im6o, M_IPMOPTS); 2995 } 2996 2997 /* 2998 * Set IPv6 outgoing packet options based on advanced API. 2999 */ 3000 int 3001 ip6_setpktopts(control, opt, stickyopt, priv, needcopy, uproto) 3002 struct mbuf *control; 3003 struct ip6_pktopts *opt, *stickyopt; 3004 int priv, needcopy, uproto; 3005 { 3006 struct cmsghdr *cm = 0; 3007 3008 if (control == NULL || opt == NULL) 3009 return (EINVAL); 3010 3011 if (stickyopt) { 3012 /* 3013 * If stickyopt is provided, make a local copy of the options 3014 * for this particular packet, then override them by ancillary 3015 * objects. 3016 * XXX: need to gain a reference for the cached route of the 3017 * next hop in case of the overriding. 3018 */ 3019 *opt = *stickyopt; 3020 if (opt->ip6po_nextroute.ro_rt) { 3021 RT_LOCK(opt->ip6po_nextroute.ro_rt); 3022 RT_ADDREF(opt->ip6po_nextroute.ro_rt); 3023 RT_UNLOCK(opt->ip6po_nextroute.ro_rt); 3024 } 3025 } else 3026 ip6_initpktopts(opt); 3027 opt->needfree = needcopy; 3028 3029 /* 3030 * XXX: Currently, we assume all the optional information is stored 3031 * in a single mbuf. 3032 */ 3033 if (control->m_next) 3034 return (EINVAL); 3035 3036 for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), 3037 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 3038 int error; 3039 3040 if (control->m_len < CMSG_LEN(0)) 3041 return (EINVAL); 3042 3043 cm = mtod(control, struct cmsghdr *); 3044 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 3045 return (EINVAL); 3046 if (cm->cmsg_level != IPPROTO_IPV6) 3047 continue; 3048 3049 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 3050 cm->cmsg_len - CMSG_LEN(0), opt, priv, needcopy, 1, uproto); 3051 if (error) 3052 return (error); 3053 } 3054 3055 return (0); 3056 } 3057 3058 /* 3059 * Set a particular packet option, as a sticky option or an ancillary data 3060 * item. "len" can be 0 only when it's a sticky option. 3061 * We have 4 cases of combination of "sticky" and "cmsg": 3062 * "sticky=0, cmsg=0": impossible 3063 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 3064 * "sticky=1, cmsg=0": RFC3542 socket option 3065 * "sticky=1, cmsg=1": RFC2292 socket option 3066 */ 3067 static int 3068 ip6_setpktopt(optname, buf, len, opt, priv, sticky, cmsg, uproto) 3069 int optname, len, priv, sticky, cmsg, uproto; 3070 u_char *buf; 3071 struct ip6_pktopts *opt; 3072 { 3073 int minmtupolicy, preftemp; 3074 3075 if (!sticky && !cmsg) { 3076 #ifdef DIAGNOSTIC 3077 printf("ip6_setpktopt: impossible case\n"); 3078 #endif 3079 return (EINVAL); 3080 } 3081 3082 /* 3083 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 3084 * not be specified in the context of RFC3542. Conversely, 3085 * RFC3542 types should not be specified in the context of RFC2292. 3086 */ 3087 if (!cmsg) { 3088 switch (optname) { 3089 case IPV6_2292PKTINFO: 3090 case IPV6_2292HOPLIMIT: 3091 case IPV6_2292NEXTHOP: 3092 case IPV6_2292HOPOPTS: 3093 case IPV6_2292DSTOPTS: 3094 case IPV6_2292RTHDR: 3095 case IPV6_2292PKTOPTIONS: 3096 return (ENOPROTOOPT); 3097 } 3098 } 3099 if (sticky && cmsg) { 3100 switch (optname) { 3101 case IPV6_PKTINFO: 3102 case IPV6_HOPLIMIT: 3103 case IPV6_NEXTHOP: 3104 case IPV6_HOPOPTS: 3105 case IPV6_DSTOPTS: 3106 case IPV6_RTHDRDSTOPTS: 3107 case IPV6_RTHDR: 3108 case IPV6_USE_MIN_MTU: 3109 case IPV6_DONTFRAG: 3110 case IPV6_TCLASS: 3111 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 3112 return (ENOPROTOOPT); 3113 } 3114 } 3115 3116 switch (optname) { 3117 case IPV6_2292PKTINFO: 3118 case IPV6_PKTINFO: 3119 { 3120 struct ifnet *ifp = NULL; 3121 struct in6_pktinfo *pktinfo; 3122 3123 if (len != sizeof(struct in6_pktinfo)) 3124 return (EINVAL); 3125 3126 pktinfo = (struct in6_pktinfo *)buf; 3127 3128 /* 3129 * An application can clear any sticky IPV6_PKTINFO option by 3130 * doing a "regular" setsockopt with ipi6_addr being 3131 * in6addr_any and ipi6_ifindex being zero. 3132 * [RFC 3542, Section 6] 3133 */ 3134 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 3135 pktinfo->ipi6_ifindex == 0 && 3136 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3137 ip6_clearpktopts(opt, optname); 3138 break; 3139 } 3140 3141 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 3142 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3143 return (EINVAL); 3144 } 3145 3146 /* validate the interface index if specified. */ 3147 if (pktinfo->ipi6_ifindex > if_index || 3148 pktinfo->ipi6_ifindex < 0) { 3149 return (ENXIO); 3150 } 3151 if (pktinfo->ipi6_ifindex) { 3152 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 3153 if (ifp == NULL) 3154 return (ENXIO); 3155 } 3156 3157 /* 3158 * We store the address anyway, and let in6_selectsrc() 3159 * validate the specified address. This is because ipi6_addr 3160 * may not have enough information about its scope zone, and 3161 * we may need additional information (such as outgoing 3162 * interface or the scope zone of a destination address) to 3163 * disambiguate the scope. 3164 * XXX: the delay of the validation may confuse the 3165 * application when it is used as a sticky option. 3166 */ 3167 if (sticky) { 3168 if (opt->ip6po_pktinfo == NULL) { 3169 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 3170 M_IP6OPT, M_WAITOK); 3171 } 3172 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 3173 } else 3174 opt->ip6po_pktinfo = pktinfo; 3175 break; 3176 } 3177 3178 case IPV6_2292HOPLIMIT: 3179 case IPV6_HOPLIMIT: 3180 { 3181 int *hlimp; 3182 3183 /* 3184 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 3185 * to simplify the ordering among hoplimit options. 3186 */ 3187 if (optname == IPV6_HOPLIMIT && sticky) 3188 return (ENOPROTOOPT); 3189 3190 if (len != sizeof(int)) 3191 return (EINVAL); 3192 hlimp = (int *)buf; 3193 if (*hlimp < -1 || *hlimp > 255) 3194 return (EINVAL); 3195 3196 opt->ip6po_hlim = *hlimp; 3197 break; 3198 } 3199 3200 case IPV6_TCLASS: 3201 { 3202 int tclass; 3203 3204 if (len != sizeof(int)) 3205 return (EINVAL); 3206 tclass = *(int *)buf; 3207 if (tclass < -1 || tclass > 255) 3208 return (EINVAL); 3209 3210 opt->ip6po_tclass = tclass; 3211 break; 3212 } 3213 3214 case IPV6_2292NEXTHOP: 3215 case IPV6_NEXTHOP: 3216 if (!priv) 3217 return (EPERM); 3218 3219 if (len == 0) { /* just remove the option */ 3220 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3221 break; 3222 } 3223 3224 /* check if cmsg_len is large enough for sa_len */ 3225 if (len < sizeof(struct sockaddr) || len < *buf) 3226 return (EINVAL); 3227 3228 switch (((struct sockaddr *)buf)->sa_family) { 3229 case AF_INET6: 3230 { 3231 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3232 #if 0 3233 int error; 3234 #endif 3235 3236 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3237 return (EINVAL); 3238 3239 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3240 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3241 return (EINVAL); 3242 } 3243 #if 0 3244 if ((error = scope6_check_id(sa6, ip6_use_defzone)) 3245 != 0) { 3246 return (error); 3247 } 3248 #endif 3249 sa6->sin6_scope_id = 0; /* XXX */ 3250 break; 3251 } 3252 case AF_LINK: /* should eventually be supported */ 3253 default: 3254 return (EAFNOSUPPORT); 3255 } 3256 3257 /* turn off the previous option, then set the new option. */ 3258 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3259 if (sticky) { 3260 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_WAITOK); 3261 bcopy(buf, opt->ip6po_nexthop, *buf); 3262 } else 3263 opt->ip6po_nexthop = (struct sockaddr *)buf; 3264 break; 3265 3266 case IPV6_2292HOPOPTS: 3267 case IPV6_HOPOPTS: 3268 { 3269 struct ip6_hbh *hbh; 3270 int hbhlen; 3271 3272 /* 3273 * XXX: We don't allow a non-privileged user to set ANY HbH 3274 * options, since per-option restriction has too much 3275 * overhead. 3276 */ 3277 if (!priv) 3278 return (EPERM); 3279 3280 if (len == 0) { 3281 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3282 break; /* just remove the option */ 3283 } 3284 3285 /* message length validation */ 3286 if (len < sizeof(struct ip6_hbh)) 3287 return (EINVAL); 3288 hbh = (struct ip6_hbh *)buf; 3289 hbhlen = (hbh->ip6h_len + 1) << 3; 3290 if (len != hbhlen) 3291 return (EINVAL); 3292 3293 /* turn off the previous option, then set the new option. */ 3294 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3295 if (sticky) { 3296 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_WAITOK); 3297 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3298 } else 3299 opt->ip6po_hbh = hbh; 3300 3301 break; 3302 } 3303 3304 case IPV6_2292DSTOPTS: 3305 case IPV6_DSTOPTS: 3306 case IPV6_RTHDRDSTOPTS: 3307 { 3308 struct ip6_dest *dest, **newdest = NULL; 3309 int destlen; 3310 3311 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3312 return (EPERM); 3313 3314 if (len == 0) { 3315 ip6_clearpktopts(opt, optname); 3316 break; /* just remove the option */ 3317 } 3318 3319 /* message length validation */ 3320 if (len < sizeof(struct ip6_dest)) 3321 return (EINVAL); 3322 dest = (struct ip6_dest *)buf; 3323 destlen = (dest->ip6d_len + 1) << 3; 3324 if (len != destlen) 3325 return (EINVAL); 3326 3327 /* 3328 * Determine the position that the destination options header 3329 * should be inserted; before or after the routing header. 3330 */ 3331 switch (optname) { 3332 case IPV6_2292DSTOPTS: 3333 /* 3334 * The old advacned API is ambiguous on this point. 3335 * Our approach is to determine the position based 3336 * according to the existence of a routing header. 3337 * Note, however, that this depends on the order of the 3338 * extension headers in the ancillary data; the 1st 3339 * part of the destination options header must appear 3340 * before the routing header in the ancillary data, 3341 * too. 3342 * RFC3542 solved the ambiguity by introducing 3343 * separate ancillary data or option types. 3344 */ 3345 if (opt->ip6po_rthdr == NULL) 3346 newdest = &opt->ip6po_dest1; 3347 else 3348 newdest = &opt->ip6po_dest2; 3349 break; 3350 case IPV6_RTHDRDSTOPTS: 3351 newdest = &opt->ip6po_dest1; 3352 break; 3353 case IPV6_DSTOPTS: 3354 newdest = &opt->ip6po_dest2; 3355 break; 3356 } 3357 3358 /* turn off the previous option, then set the new option. */ 3359 ip6_clearpktopts(opt, optname); 3360 if (sticky) { 3361 *newdest = malloc(destlen, M_IP6OPT, M_WAITOK); 3362 bcopy(dest, *newdest, destlen); 3363 } else 3364 *newdest = dest; 3365 3366 break; 3367 } 3368 3369 case IPV6_2292RTHDR: 3370 case IPV6_RTHDR: 3371 { 3372 struct ip6_rthdr *rth; 3373 int rthlen; 3374 3375 if (len == 0) { 3376 ip6_clearpktopts(opt, IPV6_RTHDR); 3377 break; /* just remove the option */ 3378 } 3379 3380 /* message length validation */ 3381 if (len < sizeof(struct ip6_rthdr)) 3382 return (EINVAL); 3383 rth = (struct ip6_rthdr *)buf; 3384 rthlen = (rth->ip6r_len + 1) << 3; 3385 if (len != rthlen) 3386 return (EINVAL); 3387 3388 switch (rth->ip6r_type) { 3389 case IPV6_RTHDR_TYPE_0: 3390 if (rth->ip6r_len == 0) /* must contain one addr */ 3391 return (EINVAL); 3392 if (rth->ip6r_len % 2) /* length must be even */ 3393 return (EINVAL); 3394 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3395 return (EINVAL); 3396 break; 3397 default: 3398 return (EINVAL); /* not supported */ 3399 } 3400 3401 /* turn off the previous option */ 3402 ip6_clearpktopts(opt, IPV6_RTHDR); 3403 if (sticky) { 3404 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_WAITOK); 3405 bcopy(rth, opt->ip6po_rthdr, rthlen); 3406 } else 3407 opt->ip6po_rthdr = rth; 3408 3409 break; 3410 } 3411 3412 case IPV6_USE_MIN_MTU: 3413 if (len != sizeof(int)) 3414 return (EINVAL); 3415 minmtupolicy = *(int *)buf; 3416 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3417 minmtupolicy != IP6PO_MINMTU_DISABLE && 3418 minmtupolicy != IP6PO_MINMTU_ALL) { 3419 return (EINVAL); 3420 } 3421 opt->ip6po_minmtu = minmtupolicy; 3422 break; 3423 3424 case IPV6_DONTFRAG: 3425 if (len != sizeof(int)) 3426 return (EINVAL); 3427 3428 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3429 /* 3430 * we ignore this option for TCP sockets. 3431 * (RFC3542 leaves this case unspecified.) 3432 */ 3433 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3434 } else 3435 opt->ip6po_flags |= IP6PO_DONTFRAG; 3436 break; 3437 3438 case IPV6_PREFER_TEMPADDR: 3439 if (len != sizeof(int)) 3440 return (EINVAL); 3441 preftemp = *(int *)buf; 3442 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3443 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3444 preftemp != IP6PO_TEMPADDR_PREFER) { 3445 return (EINVAL); 3446 } 3447 opt->ip6po_prefer_tempaddr = preftemp; 3448 break; 3449 3450 default: 3451 return (ENOPROTOOPT); 3452 } /* end of switch */ 3453 3454 return (0); 3455 } 3456 3457 /* 3458 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3459 * packet to the input queue of a specified interface. Note that this 3460 * calls the output routine of the loopback "driver", but with an interface 3461 * pointer that might NOT be &loif -- easier than replicating that code here. 3462 */ 3463 void 3464 ip6_mloopback(ifp, m, dst) 3465 struct ifnet *ifp; 3466 struct mbuf *m; 3467 struct sockaddr_in6 *dst; 3468 { 3469 struct mbuf *copym; 3470 struct ip6_hdr *ip6; 3471 3472 copym = m_copy(m, 0, M_COPYALL); 3473 if (copym == NULL) 3474 return; 3475 3476 /* 3477 * Make sure to deep-copy IPv6 header portion in case the data 3478 * is in an mbuf cluster, so that we can safely override the IPv6 3479 * header portion later. 3480 */ 3481 if ((copym->m_flags & M_EXT) != 0 || 3482 copym->m_len < sizeof(struct ip6_hdr)) { 3483 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3484 if (copym == NULL) 3485 return; 3486 } 3487 3488 #ifdef DIAGNOSTIC 3489 if (copym->m_len < sizeof(*ip6)) { 3490 m_freem(copym); 3491 return; 3492 } 3493 #endif 3494 3495 ip6 = mtod(copym, struct ip6_hdr *); 3496 /* 3497 * clear embedded scope identifiers if necessary. 3498 * in6_clearscope will touch the addresses only when necessary. 3499 */ 3500 in6_clearscope(&ip6->ip6_src); 3501 in6_clearscope(&ip6->ip6_dst); 3502 3503 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3504 } 3505 3506 /* 3507 * Chop IPv6 header off from the payload. 3508 */ 3509 static int 3510 ip6_splithdr(m, exthdrs) 3511 struct mbuf *m; 3512 struct ip6_exthdrs *exthdrs; 3513 { 3514 struct mbuf *mh; 3515 struct ip6_hdr *ip6; 3516 3517 ip6 = mtod(m, struct ip6_hdr *); 3518 if (m->m_len > sizeof(*ip6)) { 3519 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3520 if (mh == 0) { 3521 m_freem(m); 3522 return ENOBUFS; 3523 } 3524 M_MOVE_PKTHDR(mh, m); 3525 MH_ALIGN(mh, sizeof(*ip6)); 3526 m->m_len -= sizeof(*ip6); 3527 m->m_data += sizeof(*ip6); 3528 mh->m_next = m; 3529 m = mh; 3530 m->m_len = sizeof(*ip6); 3531 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3532 } 3533 exthdrs->ip6e_ip6 = m; 3534 return 0; 3535 } 3536 3537 /* 3538 * Compute IPv6 extension header length. 3539 */ 3540 int 3541 ip6_optlen(in6p) 3542 struct in6pcb *in6p; 3543 { 3544 int len; 3545 3546 if (!in6p->in6p_outputopts) 3547 return 0; 3548 3549 len = 0; 3550 #define elen(x) \ 3551 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3552 3553 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3554 if (in6p->in6p_outputopts->ip6po_rthdr) 3555 /* dest1 is valid with rthdr only */ 3556 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3557 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3558 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3559 return len; 3560 #undef elen 3561 }
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