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sys/netinet6/ip6_output.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_output.c,v 1.279 2002/01/26 06:12:30 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/ip6_output.c 184163 2008-10-22 14:58:23Z bz $"); 65 66 #include "opt_ip6fw.h" 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 71 #include <sys/param.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/proc.h> 75 #include <sys/errno.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/systm.h> 80 #include <sys/kernel.h> 81 82 #include <net/if.h> 83 #include <net/netisr.h> 84 #include <net/route.h> 85 #include <net/pfil.h> 86 87 #include <netinet/in.h> 88 #include <netinet/in_var.h> 89 #include <netinet6/in6_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet/icmp6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet6/nd6.h> 96 97 #ifdef IPSEC 98 #include <netinet6/ipsec.h> 99 #ifdef INET6 100 #include <netinet6/ipsec6.h> 101 #endif 102 #include <netkey/key.h> 103 #endif /* IPSEC */ 104 105 #ifdef FAST_IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/ipsec6.h> 108 #include <netipsec/key.h> 109 #endif /* FAST_IPSEC */ 110 111 #include <netinet6/ip6_fw.h> 112 113 #include <net/net_osdep.h> 114 115 #include <netinet6/ip6protosw.h> 116 #include <netinet6/scope6_var.h> 117 118 static MALLOC_DEFINE(M_IP6MOPTS, "ip6_moptions", "internet multicast options"); 119 120 struct ip6_exthdrs { 121 struct mbuf *ip6e_ip6; 122 struct mbuf *ip6e_hbh; 123 struct mbuf *ip6e_dest1; 124 struct mbuf *ip6e_rthdr; 125 struct mbuf *ip6e_dest2; 126 }; 127 128 static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, 129 int, int)); 130 static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, 131 struct socket *, struct sockopt *)); 132 static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); 133 static int ip6_setpktopt __P((int, u_char *, int, struct ip6_pktopts *, int, 134 int, int, int)); 135 136 static int ip6_setmoptions(int, struct ip6_moptions **, struct mbuf *); 137 static int ip6_getmoptions(int, struct ip6_moptions *, struct mbuf **); 138 static int ip6_copyexthdr(struct mbuf **, caddr_t, int); 139 static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, 140 struct ip6_frag **)); 141 static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); 142 static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); 143 static int ip6_getpmtu __P((struct route_in6 *, struct route_in6 *, 144 struct ifnet *, struct in6_addr *, u_long *, int *)); 145 static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); 146 147 148 /* 149 * IP6 output. The packet in mbuf chain m contains a skeletal IP6 150 * header (with pri, len, nxt, hlim, src, dst). 151 * This function may modify ver and hlim only. 152 * The mbuf chain containing the packet will be freed. 153 * The mbuf opt, if present, will not be freed. 154 * 155 * type of "mtu": rt_rmx.rmx_mtu is u_long, ifnet.ifr_mtu is int, and 156 * nd_ifinfo.linkmtu is u_int32_t. so we use u_long to hold largest one, 157 * which is rt_rmx.rmx_mtu. 158 */ 159 int 160 ip6_output(m0, opt, ro, flags, im6o, ifpp, inp) 161 struct mbuf *m0; 162 struct ip6_pktopts *opt; 163 struct route_in6 *ro; 164 int flags; 165 struct ip6_moptions *im6o; 166 struct ifnet **ifpp; /* XXX: just for statistics */ 167 struct inpcb *inp; 168 { 169 struct ip6_hdr *ip6, *mhip6; 170 struct ifnet *ifp, *origifp; 171 struct mbuf *m = m0; 172 int hlen, tlen, len, off; 173 struct route_in6 ip6route; 174 struct rtentry *rt = NULL; 175 struct sockaddr_in6 *dst, src_sa, dst_sa; 176 struct in6_addr odst; 177 int error = 0; 178 struct in6_ifaddr *ia = NULL; 179 u_long mtu; 180 int alwaysfrag, dontfrag; 181 u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; 182 struct ip6_exthdrs exthdrs; 183 struct in6_addr finaldst, src0, dst0; 184 u_int32_t zone; 185 struct route_in6 *ro_pmtu = NULL; 186 int hdrsplit = 0; 187 int needipsec = 0; 188 #if defined(IPSEC) || defined(FAST_IPSEC) 189 int needipsectun = 0; 190 struct secpolicy *sp = NULL; 191 #endif /*IPSEC || FAST_IPSEC*/ 192 193 ip6 = mtod(m, struct ip6_hdr *); 194 finaldst = ip6->ip6_dst; 195 196 #define MAKE_EXTHDR(hp, mp) \ 197 do { \ 198 if (hp) { \ 199 struct ip6_ext *eh = (struct ip6_ext *)(hp); \ 200 error = ip6_copyexthdr((mp), (caddr_t)(hp), \ 201 ((eh)->ip6e_len + 1) << 3); \ 202 if (error) \ 203 goto freehdrs; \ 204 } \ 205 } while (/*CONSTCOND*/ 0) 206 207 bzero(&exthdrs, sizeof(exthdrs)); 208 209 if (opt) { 210 /* Hop-by-Hop options header */ 211 MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); 212 /* Destination options header(1st part) */ 213 if (opt->ip6po_rthdr) { 214 /* 215 * Destination options header(1st part) 216 * This only makes sence with a routing header. 217 * See Section 9.2 of RFC 3542. 218 * Disabling this part just for MIP6 convenience is 219 * a bad idea. We need to think carefully about a 220 * way to make the advanced API coexist with MIP6 221 * options, which might automatically be inserted in 222 * the kernel. 223 */ 224 MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); 225 } 226 /* Routing header */ 227 MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); 228 /* Destination options header(2nd part) */ 229 MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); 230 } 231 232 #ifdef IPSEC 233 /* get a security policy for this packet */ 234 if (inp == NULL) 235 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 236 else 237 sp = ipsec6_getpolicybypcb(m, IPSEC_DIR_OUTBOUND, inp, &error); 238 239 if (sp == NULL) { 240 ipsec6stat.out_inval++; 241 goto freehdrs; 242 } 243 244 error = 0; 245 246 /* check policy */ 247 switch (sp->policy) { 248 case IPSEC_POLICY_DISCARD: 249 /* 250 * This packet is just discarded. 251 */ 252 ipsec6stat.out_polvio++; 253 goto freehdrs; 254 255 case IPSEC_POLICY_BYPASS: 256 case IPSEC_POLICY_NONE: 257 /* no need to do IPsec. */ 258 needipsec = 0; 259 break; 260 261 case IPSEC_POLICY_IPSEC: 262 if (sp->req == NULL) { 263 /* acquire a policy */ 264 error = key_spdacquire(sp); 265 goto freehdrs; 266 } 267 needipsec = 1; 268 break; 269 270 case IPSEC_POLICY_ENTRUST: 271 default: 272 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 273 } 274 #endif /* IPSEC */ 275 #ifdef FAST_IPSEC 276 /* get a security policy for this packet */ 277 if (inp == NULL) 278 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); 279 else 280 sp = ipsec_getpolicybysock(m, IPSEC_DIR_OUTBOUND, inp, &error); 281 282 if (sp == NULL) { 283 newipsecstat.ips_out_inval++; 284 goto freehdrs; 285 } 286 287 error = 0; 288 289 /* check policy */ 290 switch (sp->policy) { 291 case IPSEC_POLICY_DISCARD: 292 /* 293 * This packet is just discarded. 294 */ 295 newipsecstat.ips_out_polvio++; 296 goto freehdrs; 297 298 case IPSEC_POLICY_BYPASS: 299 case IPSEC_POLICY_NONE: 300 /* no need to do IPsec. */ 301 needipsec = 0; 302 break; 303 304 case IPSEC_POLICY_IPSEC: 305 if (sp->req == NULL) { 306 /* acquire a policy */ 307 error = key_spdacquire(sp); 308 goto freehdrs; 309 } 310 needipsec = 1; 311 break; 312 313 case IPSEC_POLICY_ENTRUST: 314 default: 315 printf("ip6_output: Invalid policy found. %d\n", sp->policy); 316 } 317 #endif /* FAST_IPSEC */ 318 319 /* 320 * Calculate the total length of the extension header chain. 321 * Keep the length of the unfragmentable part for fragmentation. 322 */ 323 optlen = 0; 324 if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; 325 if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; 326 if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; 327 unfragpartlen = optlen + sizeof(struct ip6_hdr); 328 /* NOTE: we don't add AH/ESP length here. do that later. */ 329 if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; 330 331 /* 332 * If we need IPsec, or there is at least one extension header, 333 * separate IP6 header from the payload. 334 */ 335 if ((needipsec || optlen) && !hdrsplit) { 336 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 337 m = NULL; 338 goto freehdrs; 339 } 340 m = exthdrs.ip6e_ip6; 341 hdrsplit++; 342 } 343 344 /* adjust pointer */ 345 ip6 = mtod(m, struct ip6_hdr *); 346 347 /* adjust mbuf packet header length */ 348 m->m_pkthdr.len += optlen; 349 plen = m->m_pkthdr.len - sizeof(*ip6); 350 351 /* If this is a jumbo payload, insert a jumbo payload option. */ 352 if (plen > IPV6_MAXPACKET) { 353 if (!hdrsplit) { 354 if ((error = ip6_splithdr(m, &exthdrs)) != 0) { 355 m = NULL; 356 goto freehdrs; 357 } 358 m = exthdrs.ip6e_ip6; 359 hdrsplit++; 360 } 361 /* adjust pointer */ 362 ip6 = mtod(m, struct ip6_hdr *); 363 if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) 364 goto freehdrs; 365 ip6->ip6_plen = 0; 366 } else 367 ip6->ip6_plen = htons(plen); 368 369 /* 370 * Concatenate headers and fill in next header fields. 371 * Here we have, on "m" 372 * IPv6 payload 373 * and we insert headers accordingly. Finally, we should be getting: 374 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 375 * 376 * during the header composing process, "m" points to IPv6 header. 377 * "mprev" points to an extension header prior to esp. 378 */ 379 { 380 u_char *nexthdrp = &ip6->ip6_nxt; 381 struct mbuf *mprev = m; 382 383 /* 384 * we treat dest2 specially. this makes IPsec processing 385 * much easier. the goal here is to make mprev point the 386 * mbuf prior to dest2. 387 * 388 * result: IPv6 dest2 payload 389 * m and mprev will point to IPv6 header. 390 */ 391 if (exthdrs.ip6e_dest2) { 392 if (!hdrsplit) 393 panic("assumption failed: hdr not split"); 394 exthdrs.ip6e_dest2->m_next = m->m_next; 395 m->m_next = exthdrs.ip6e_dest2; 396 *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; 397 ip6->ip6_nxt = IPPROTO_DSTOPTS; 398 } 399 400 #define MAKE_CHAIN(m, mp, p, i)\ 401 do {\ 402 if (m) {\ 403 if (!hdrsplit) \ 404 panic("assumption failed: hdr not split"); \ 405 *mtod((m), u_char *) = *(p);\ 406 *(p) = (i);\ 407 p = mtod((m), u_char *);\ 408 (m)->m_next = (mp)->m_next;\ 409 (mp)->m_next = (m);\ 410 (mp) = (m);\ 411 }\ 412 } while (/*CONSTCOND*/ 0) 413 /* 414 * result: IPv6 hbh dest1 rthdr dest2 payload 415 * m will point to IPv6 header. mprev will point to the 416 * extension header prior to dest2 (rthdr in the above case). 417 */ 418 MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); 419 MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, 420 IPPROTO_DSTOPTS); 421 MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, 422 IPPROTO_ROUTING); 423 424 #if defined(IPSEC) || defined(FAST_IPSEC) 425 if (!needipsec) 426 goto skip_ipsec2; 427 428 /* 429 * pointers after IPsec headers are not valid any more. 430 * other pointers need a great care too. 431 * (IPsec routines should not mangle mbufs prior to AH/ESP) 432 */ 433 exthdrs.ip6e_dest2 = NULL; 434 435 { 436 struct ip6_rthdr *rh = NULL; 437 int segleft_org = 0; 438 struct ipsec_output_state state; 439 440 if (exthdrs.ip6e_rthdr) { 441 rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); 442 segleft_org = rh->ip6r_segleft; 443 rh->ip6r_segleft = 0; 444 } 445 446 bzero(&state, sizeof(state)); 447 state.m = m; 448 error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, 449 &needipsectun); 450 m = state.m; 451 if (error) { 452 /* mbuf is already reclaimed in ipsec6_output_trans. */ 453 m = NULL; 454 switch (error) { 455 case EHOSTUNREACH: 456 case ENETUNREACH: 457 case EMSGSIZE: 458 case ENOBUFS: 459 case ENOMEM: 460 break; 461 default: 462 printf("ip6_output (ipsec): error code %d\n", error); 463 /* FALLTHROUGH */ 464 case ENOENT: 465 /* don't show these error codes to the user */ 466 error = 0; 467 break; 468 } 469 goto bad; 470 } 471 if (exthdrs.ip6e_rthdr) { 472 /* ah6_output doesn't modify mbuf chain */ 473 rh->ip6r_segleft = segleft_org; 474 } 475 } 476 skip_ipsec2:; 477 #endif 478 } 479 480 /* 481 * If there is a routing header, replace the destination address field 482 * with the first hop of the routing header. 483 */ 484 if (exthdrs.ip6e_rthdr) { 485 struct ip6_rthdr *rh = 486 (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, 487 struct ip6_rthdr *)); 488 struct ip6_rthdr0 *rh0; 489 struct in6_addr *addr; 490 struct sockaddr_in6 sa; 491 492 switch (rh->ip6r_type) { 493 case IPV6_RTHDR_TYPE_0: 494 rh0 = (struct ip6_rthdr0 *)rh; 495 addr = (struct in6_addr *)(rh0 + 1); 496 497 /* 498 * construct a sockaddr_in6 form of 499 * the first hop. 500 * 501 * XXX: we may not have enough 502 * information about its scope zone; 503 * there is no standard API to pass 504 * the information from the 505 * application. 506 */ 507 bzero(&sa, sizeof(sa)); 508 sa.sin6_family = AF_INET6; 509 sa.sin6_len = sizeof(sa); 510 sa.sin6_addr = addr[0]; 511 if ((error = sa6_embedscope(&sa, 512 ip6_use_defzone)) != 0) { 513 goto bad; 514 } 515 ip6->ip6_dst = sa.sin6_addr; 516 bcopy(&addr[1], &addr[0], sizeof(struct in6_addr) 517 * (rh0->ip6r0_segleft - 1)); 518 addr[rh0->ip6r0_segleft - 1] = finaldst; 519 /* XXX */ 520 in6_clearscope(addr + rh0->ip6r0_segleft - 1); 521 break; 522 default: /* is it possible? */ 523 error = EINVAL; 524 goto bad; 525 } 526 } 527 528 /* Source address validation */ 529 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && 530 (flags & IPV6_UNSPECSRC) == 0) { 531 error = EOPNOTSUPP; 532 ip6stat.ip6s_badscope++; 533 goto bad; 534 } 535 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 536 error = EOPNOTSUPP; 537 ip6stat.ip6s_badscope++; 538 goto bad; 539 } 540 541 ip6stat.ip6s_localout++; 542 543 /* 544 * Route packet. 545 */ 546 if (ro == 0) { 547 ro = &ip6route; 548 bzero((caddr_t)ro, sizeof(*ro)); 549 } 550 ro_pmtu = ro; 551 if (opt && opt->ip6po_rthdr) 552 ro = &opt->ip6po_route; 553 dst = (struct sockaddr_in6 *)&ro->ro_dst; 554 555 again: 556 /* 557 * if specified, try to fill in the traffic class field. 558 * do not override if a non-zero value is already set. 559 * we check the diffserv field and the ecn field separately. 560 */ 561 if (opt && opt->ip6po_tclass >= 0) { 562 int mask = 0; 563 564 if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) 565 mask |= 0xfc; 566 if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) 567 mask |= 0x03; 568 if (mask != 0) 569 ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); 570 } 571 572 /* fill in or override the hop limit field, if necessary. */ 573 if (opt && opt->ip6po_hlim != -1) 574 ip6->ip6_hlim = opt->ip6po_hlim & 0xff; 575 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 576 if (im6o != NULL) 577 ip6->ip6_hlim = im6o->im6o_multicast_hlim; 578 else 579 ip6->ip6_hlim = ip6_defmcasthlim; 580 } 581 582 #if defined(IPSEC) || defined(FAST_IPSEC) 583 if (needipsec && needipsectun) { 584 struct ipsec_output_state state; 585 586 /* 587 * All the extension headers will become inaccessible 588 * (since they can be encrypted). 589 * Don't panic, we need no more updates to extension headers 590 * on inner IPv6 packet (since they are now encapsulated). 591 * 592 * IPv6 [ESP|AH] IPv6 [extension headers] payload 593 */ 594 bzero(&exthdrs, sizeof(exthdrs)); 595 exthdrs.ip6e_ip6 = m; 596 597 bzero(&state, sizeof(state)); 598 state.m = m; 599 state.ro = (struct route *)ro; 600 state.dst = (struct sockaddr *)dst; 601 602 error = ipsec6_output_tunnel(&state, sp, flags); 603 604 m = state.m; 605 ro = (struct route_in6 *)state.ro; 606 dst = (struct sockaddr_in6 *)state.dst; 607 if (error) { 608 /* mbuf is already reclaimed in ipsec6_output_tunnel. */ 609 m0 = m = NULL; 610 m = NULL; 611 switch (error) { 612 case EHOSTUNREACH: 613 case ENETUNREACH: 614 case EMSGSIZE: 615 case ENOBUFS: 616 case ENOMEM: 617 break; 618 default: 619 printf("ip6_output (ipsec): error code %d\n", error); 620 /* FALLTHROUGH */ 621 case ENOENT: 622 /* don't show these error codes to the user */ 623 error = 0; 624 break; 625 } 626 goto bad; 627 } 628 629 exthdrs.ip6e_ip6 = m; 630 } 631 #endif /* IPSEC */ 632 633 /* adjust pointer */ 634 ip6 = mtod(m, struct ip6_hdr *); 635 636 bzero(&dst_sa, sizeof(dst_sa)); 637 dst_sa.sin6_family = AF_INET6; 638 dst_sa.sin6_len = sizeof(dst_sa); 639 dst_sa.sin6_addr = ip6->ip6_dst; 640 if ((error = in6_selectroute(&dst_sa, opt, im6o, ro, 641 &ifp, &rt, 0)) != 0) { 642 switch (error) { 643 case EHOSTUNREACH: 644 ip6stat.ip6s_noroute++; 645 break; 646 case EADDRNOTAVAIL: 647 default: 648 break; /* XXX statistics? */ 649 } 650 if (ifp != NULL) 651 in6_ifstat_inc(ifp, ifs6_out_discard); 652 goto bad; 653 } 654 if (rt == NULL) { 655 /* 656 * If in6_selectroute() does not return a route entry, 657 * dst may not have been updated. 658 */ 659 *dst = dst_sa; /* XXX */ 660 } 661 662 /* 663 * then rt (for unicast) and ifp must be non-NULL valid values. 664 */ 665 if ((flags & IPV6_FORWARDING) == 0) { 666 /* XXX: the FORWARDING flag can be set for mrouting. */ 667 in6_ifstat_inc(ifp, ifs6_out_request); 668 } 669 if (rt != NULL) { 670 ia = (struct in6_ifaddr *)(rt->rt_ifa); 671 rt->rt_use++; 672 } 673 674 /* 675 * The outgoing interface must be in the zone of source and 676 * destination addresses. We should use ia_ifp to support the 677 * case of sending packets to an address of our own. 678 */ 679 if (ia != NULL && ia->ia_ifp) 680 origifp = ia->ia_ifp; 681 else 682 origifp = ifp; 683 684 src0 = ip6->ip6_src; 685 if (in6_setscope(&src0, origifp, &zone)) 686 goto badscope; 687 bzero(&src_sa, sizeof(src_sa)); 688 src_sa.sin6_family = AF_INET6; 689 src_sa.sin6_len = sizeof(src_sa); 690 src_sa.sin6_addr = ip6->ip6_src; 691 if (sa6_recoverscope(&src_sa) || zone != src_sa.sin6_scope_id) 692 goto badscope; 693 694 dst0 = ip6->ip6_dst; 695 if (in6_setscope(&dst0, origifp, &zone)) 696 goto badscope; 697 /* re-initialize to be sure */ 698 bzero(&dst_sa, sizeof(dst_sa)); 699 dst_sa.sin6_family = AF_INET6; 700 dst_sa.sin6_len = sizeof(dst_sa); 701 dst_sa.sin6_addr = ip6->ip6_dst; 702 if (sa6_recoverscope(&dst_sa) || zone != dst_sa.sin6_scope_id) { 703 goto badscope; 704 } 705 706 /* scope check is done. */ 707 goto routefound; 708 709 badscope: 710 ip6stat.ip6s_badscope++; 711 in6_ifstat_inc(origifp, ifs6_out_discard); 712 if (error == 0) 713 error = EHOSTUNREACH; /* XXX */ 714 goto bad; 715 716 routefound: 717 if (rt && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 718 if (opt && opt->ip6po_nextroute.ro_rt) { 719 /* 720 * The nexthop is explicitly specified by the 721 * application. We assume the next hop is an IPv6 722 * address. 723 */ 724 dst = (struct sockaddr_in6 *)opt->ip6po_nexthop; 725 } 726 else if ((rt->rt_flags & RTF_GATEWAY)) 727 dst = (struct sockaddr_in6 *)rt->rt_gateway; 728 } 729 730 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 731 m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ 732 } else { 733 struct in6_multi *in6m; 734 735 m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; 736 737 in6_ifstat_inc(ifp, ifs6_out_mcast); 738 739 /* 740 * Confirm that the outgoing interface supports multicast. 741 */ 742 if (!(ifp->if_flags & IFF_MULTICAST)) { 743 ip6stat.ip6s_noroute++; 744 in6_ifstat_inc(ifp, ifs6_out_discard); 745 error = ENETUNREACH; 746 goto bad; 747 } 748 IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); 749 if (in6m != NULL && 750 (im6o == NULL || im6o->im6o_multicast_loop)) { 751 /* 752 * If we belong to the destination multicast group 753 * on the outgoing interface, and the caller did not 754 * forbid loopback, loop back a copy. 755 */ 756 ip6_mloopback(ifp, m, dst); 757 } else { 758 /* 759 * If we are acting as a multicast router, perform 760 * multicast forwarding as if the packet had just 761 * arrived on the interface to which we are about 762 * to send. The multicast forwarding function 763 * recursively calls this function, using the 764 * IPV6_FORWARDING flag to prevent infinite recursion. 765 * 766 * Multicasts that are looped back by ip6_mloopback(), 767 * above, will be forwarded by the ip6_input() routine, 768 * if necessary. 769 */ 770 if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { 771 /* 772 * XXX: ip6_mforward expects that rcvif is NULL 773 * when it is called from the originating path. 774 * However, it is not always the case, since 775 * some versions of MGETHDR() does not 776 * initialize the field. 777 */ 778 m->m_pkthdr.rcvif = NULL; 779 if (ip6_mforward(ip6, ifp, m) != 0) { 780 m_freem(m); 781 goto done; 782 } 783 } 784 } 785 /* 786 * Multicasts with a hoplimit of zero may be looped back, 787 * above, but must not be transmitted on a network. 788 * Also, multicasts addressed to the loopback interface 789 * are not sent -- the above call to ip6_mloopback() will 790 * loop back a copy if this host actually belongs to the 791 * destination group on the loopback interface. 792 */ 793 if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || 794 IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { 795 m_freem(m); 796 goto done; 797 } 798 } 799 800 /* 801 * Fill the outgoing inteface to tell the upper layer 802 * to increment per-interface statistics. 803 */ 804 if (ifpp) 805 *ifpp = ifp; 806 807 /* Determine path MTU. */ 808 if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, 809 &alwaysfrag)) != 0) 810 goto bad; 811 812 /* 813 * The caller of this function may specify to use the minimum MTU 814 * in some cases. 815 * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU 816 * setting. The logic is a bit complicated; by default, unicast 817 * packets will follow path MTU while multicast packets will be sent at 818 * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets 819 * including unicast ones will be sent at the minimum MTU. Multicast 820 * packets will always be sent at the minimum MTU unless 821 * IP6PO_MINMTU_DISABLE is explicitly specified. 822 * See RFC 3542 for more details. 823 */ 824 if (mtu > IPV6_MMTU) { 825 if ((flags & IPV6_MINMTU)) 826 mtu = IPV6_MMTU; 827 else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) 828 mtu = IPV6_MMTU; 829 else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 830 (opt == NULL || 831 opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { 832 mtu = IPV6_MMTU; 833 } 834 } 835 836 /* 837 * clear embedded scope identifiers if necessary. 838 * in6_clearscope will touch the addresses only when necessary. 839 */ 840 in6_clearscope(&ip6->ip6_src); 841 in6_clearscope(&ip6->ip6_dst); 842 843 /* 844 * Check with the firewall... 845 */ 846 if (ip6_fw_enable && ip6_fw_chk_ptr) { 847 u_short port = 0; 848 m->m_pkthdr.rcvif = NULL; /* XXX */ 849 /* If ipfw says divert, we have to just drop packet */ 850 if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { 851 m_freem(m); 852 goto done; 853 } 854 if (!m) { 855 error = EACCES; 856 goto done; 857 } 858 } 859 860 /* 861 * If the outgoing packet contains a hop-by-hop options header, 862 * it must be examined and processed even by the source node. 863 * (RFC 2460, section 4.) 864 */ 865 if (exthdrs.ip6e_hbh) { 866 struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); 867 u_int32_t dummy; /* XXX unused */ 868 u_int32_t plen = 0; /* XXX: ip6_process will check the value */ 869 870 #ifdef DIAGNOSTIC 871 if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) 872 panic("ip6e_hbh is not continuous"); 873 #endif 874 /* 875 * XXX: if we have to send an ICMPv6 error to the sender, 876 * we need the M_LOOP flag since icmp6_error() expects 877 * the IPv6 and the hop-by-hop options header are 878 * continuous unless the flag is set. 879 */ 880 m->m_flags |= M_LOOP; 881 m->m_pkthdr.rcvif = ifp; 882 if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), 883 ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), 884 &dummy, &plen) < 0) { 885 /* m was already freed at this point */ 886 error = EINVAL;/* better error? */ 887 goto done; 888 } 889 m->m_flags &= ~M_LOOP; /* XXX */ 890 m->m_pkthdr.rcvif = NULL; 891 } 892 893 /* Jump over all PFIL processing if hooks are not active. */ 894 if (inet6_pfil_hook.ph_busy_count == -1) 895 goto passout; 896 897 odst = ip6->ip6_dst; 898 /* Run through list of hooks for output packets. */ 899 error = pfil_run_hooks(&inet6_pfil_hook, &m, ifp, PFIL_OUT, inp); 900 if (error != 0 || m == NULL) 901 goto done; 902 ip6 = mtod(m, struct ip6_hdr *); 903 904 /* See if destination IP address was changed by packet filter. */ 905 if (!IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst)) { 906 m->m_flags |= M_SKIP_FIREWALL; 907 /* If destination is now ourself drop to ip6_input(). */ 908 if (in6_localaddr(&ip6->ip6_dst)) { 909 if (m->m_pkthdr.rcvif == NULL) 910 m->m_pkthdr.rcvif = loif; 911 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { 912 m->m_pkthdr.csum_flags |= 913 CSUM_DATA_VALID | CSUM_PSEUDO_HDR; 914 m->m_pkthdr.csum_data = 0xffff; 915 } 916 m->m_pkthdr.csum_flags |= 917 CSUM_IP_CHECKED | CSUM_IP_VALID; 918 error = netisr_queue(NETISR_IPV6, m); 919 goto done; 920 } else 921 goto again; /* Redo the routing table lookup. */ 922 } 923 924 /* XXX: IPFIREWALL_FORWARD */ 925 926 passout: 927 /* 928 * Send the packet to the outgoing interface. 929 * If necessary, do IPv6 fragmentation before sending. 930 * 931 * the logic here is rather complex: 932 * 1: normal case (dontfrag == 0, alwaysfrag == 0) 933 * 1-a: send as is if tlen <= path mtu 934 * 1-b: fragment if tlen > path mtu 935 * 936 * 2: if user asks us not to fragment (dontfrag == 1) 937 * 2-a: send as is if tlen <= interface mtu 938 * 2-b: error if tlen > interface mtu 939 * 940 * 3: if we always need to attach fragment header (alwaysfrag == 1) 941 * always fragment 942 * 943 * 4: if dontfrag == 1 && alwaysfrag == 1 944 * error, as we cannot handle this conflicting request 945 */ 946 tlen = m->m_pkthdr.len; 947 948 if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG)) 949 dontfrag = 1; 950 else 951 dontfrag = 0; 952 if (dontfrag && alwaysfrag) { /* case 4 */ 953 /* conflicting request - can't transmit */ 954 error = EMSGSIZE; 955 goto bad; 956 } 957 if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ 958 /* 959 * Even if the DONTFRAG option is specified, we cannot send the 960 * packet when the data length is larger than the MTU of the 961 * outgoing interface. 962 * Notify the error by sending IPV6_PATHMTU ancillary data as 963 * well as returning an error code (the latter is not described 964 * in the API spec.) 965 */ 966 u_int32_t mtu32; 967 struct ip6ctlparam ip6cp; 968 969 mtu32 = (u_int32_t)mtu; 970 bzero(&ip6cp, sizeof(ip6cp)); 971 ip6cp.ip6c_cmdarg = (void *)&mtu32; 972 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 973 (void *)&ip6cp); 974 975 error = EMSGSIZE; 976 goto bad; 977 } 978 979 /* 980 * transmit packet without fragmentation 981 */ 982 if (dontfrag || (!alwaysfrag && tlen <= mtu)) { /* case 1-a and 2-a */ 983 struct in6_ifaddr *ia6; 984 985 ip6 = mtod(m, struct ip6_hdr *); 986 ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); 987 if (ia6) { 988 /* Record statistics for this interface address. */ 989 ia6->ia_ifa.if_opackets++; 990 ia6->ia_ifa.if_obytes += m->m_pkthdr.len; 991 } 992 #ifdef IPSEC 993 /* clean ipsec history once it goes out of the node */ 994 ipsec_delaux(m); 995 #endif 996 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 997 goto done; 998 } 999 1000 /* 1001 * try to fragment the packet. case 1-b and 3 1002 */ 1003 if (mtu < IPV6_MMTU) { 1004 /* path MTU cannot be less than IPV6_MMTU */ 1005 error = EMSGSIZE; 1006 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1007 goto bad; 1008 } else if (ip6->ip6_plen == 0) { 1009 /* jumbo payload cannot be fragmented */ 1010 error = EMSGSIZE; 1011 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1012 goto bad; 1013 } else { 1014 struct mbuf **mnext, *m_frgpart; 1015 struct ip6_frag *ip6f; 1016 u_int32_t id = htonl(ip6_randomid()); 1017 u_char nextproto; 1018 #if 0 1019 struct ip6ctlparam ip6cp; 1020 u_int32_t mtu32; 1021 #endif 1022 int qslots = ifp->if_snd.ifq_maxlen - ifp->if_snd.ifq_len; 1023 1024 /* 1025 * Too large for the destination or interface; 1026 * fragment if possible. 1027 * Must be able to put at least 8 bytes per fragment. 1028 */ 1029 hlen = unfragpartlen; 1030 if (mtu > IPV6_MAXPACKET) 1031 mtu = IPV6_MAXPACKET; 1032 1033 #if 0 1034 /* 1035 * It is believed this code is a leftover from the 1036 * development of the IPV6_RECVPATHMTU sockopt and 1037 * associated work to implement RFC3542. 1038 * It's not entirely clear what the intent of the API 1039 * is at this point, so disable this code for now. 1040 * The IPV6_RECVPATHMTU sockopt and/or IPV6_DONTFRAG 1041 * will send notifications if the application requests. 1042 */ 1043 1044 /* Notify a proper path MTU to applications. */ 1045 mtu32 = (u_int32_t)mtu; 1046 bzero(&ip6cp, sizeof(ip6cp)); 1047 ip6cp.ip6c_cmdarg = (void *)&mtu32; 1048 pfctlinput2(PRC_MSGSIZE, (struct sockaddr *)&ro_pmtu->ro_dst, 1049 (void *)&ip6cp); 1050 #endif 1051 1052 len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; 1053 if (len < 8) { 1054 error = EMSGSIZE; 1055 in6_ifstat_inc(ifp, ifs6_out_fragfail); 1056 goto bad; 1057 } 1058 1059 /* 1060 * Verify that we have any chance at all of being able to queue 1061 * the packet or packet fragments 1062 */ 1063 if (qslots <= 0 || ((u_int)qslots * (mtu - hlen) 1064 < tlen /* - hlen */)) { 1065 error = ENOBUFS; 1066 ip6stat.ip6s_odropped++; 1067 goto bad; 1068 } 1069 1070 mnext = &m->m_nextpkt; 1071 1072 /* 1073 * Change the next header field of the last header in the 1074 * unfragmentable part. 1075 */ 1076 if (exthdrs.ip6e_rthdr) { 1077 nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); 1078 *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; 1079 } else if (exthdrs.ip6e_dest1) { 1080 nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); 1081 *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; 1082 } else if (exthdrs.ip6e_hbh) { 1083 nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); 1084 *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; 1085 } else { 1086 nextproto = ip6->ip6_nxt; 1087 ip6->ip6_nxt = IPPROTO_FRAGMENT; 1088 } 1089 1090 /* 1091 * Loop through length of segment after first fragment, 1092 * make new header and copy data of each part and link onto 1093 * chain. 1094 */ 1095 m0 = m; 1096 for (off = hlen; off < tlen; off += len) { 1097 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1098 if (!m) { 1099 error = ENOBUFS; 1100 ip6stat.ip6s_odropped++; 1101 goto sendorfree; 1102 } 1103 m->m_pkthdr.rcvif = NULL; 1104 m->m_flags = m0->m_flags & M_COPYFLAGS; 1105 *mnext = m; 1106 mnext = &m->m_nextpkt; 1107 m->m_data += max_linkhdr; 1108 mhip6 = mtod(m, struct ip6_hdr *); 1109 *mhip6 = *ip6; 1110 m->m_len = sizeof(*mhip6); 1111 error = ip6_insertfraghdr(m0, m, hlen, &ip6f); 1112 if (error) { 1113 ip6stat.ip6s_odropped++; 1114 goto sendorfree; 1115 } 1116 ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); 1117 if (off + len >= tlen) 1118 len = tlen - off; 1119 else 1120 ip6f->ip6f_offlg |= IP6F_MORE_FRAG; 1121 mhip6->ip6_plen = htons((u_short)(len + hlen + 1122 sizeof(*ip6f) - sizeof(struct ip6_hdr))); 1123 if ((m_frgpart = m_copy(m0, off, len)) == 0) { 1124 error = ENOBUFS; 1125 ip6stat.ip6s_odropped++; 1126 goto sendorfree; 1127 } 1128 m_cat(m, m_frgpart); 1129 m->m_pkthdr.len = len + hlen + sizeof(*ip6f); 1130 m->m_pkthdr.rcvif = NULL; 1131 ip6f->ip6f_reserved = 0; 1132 ip6f->ip6f_ident = id; 1133 ip6f->ip6f_nxt = nextproto; 1134 ip6stat.ip6s_ofragments++; 1135 in6_ifstat_inc(ifp, ifs6_out_fragcreat); 1136 } 1137 1138 in6_ifstat_inc(ifp, ifs6_out_fragok); 1139 } 1140 1141 /* 1142 * Remove leading garbages. 1143 */ 1144 sendorfree: 1145 m = m0->m_nextpkt; 1146 m0->m_nextpkt = 0; 1147 m_freem(m0); 1148 for (m0 = m; m; m = m0) { 1149 m0 = m->m_nextpkt; 1150 m->m_nextpkt = 0; 1151 if (error == 0) { 1152 /* Record statistics for this interface address. */ 1153 if (ia) { 1154 ia->ia_ifa.if_opackets++; 1155 ia->ia_ifa.if_obytes += m->m_pkthdr.len; 1156 } 1157 #ifdef IPSEC 1158 /* clean ipsec history once it goes out of the node */ 1159 ipsec_delaux(m); 1160 #endif 1161 error = nd6_output(ifp, origifp, m, dst, ro->ro_rt); 1162 } else 1163 m_freem(m); 1164 } 1165 1166 if (error == 0) 1167 ip6stat.ip6s_fragmented++; 1168 1169 done: 1170 if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ 1171 RTFREE(ro->ro_rt); 1172 } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { 1173 RTFREE(ro_pmtu->ro_rt); 1174 } 1175 1176 #ifdef IPSEC 1177 if (sp != NULL) 1178 key_freesp(sp); 1179 #endif /* IPSEC */ 1180 #ifdef FAST_IPSEC 1181 if (sp != NULL) 1182 KEY_FREESP(&sp); 1183 #endif /* FAST_IPSEC */ 1184 1185 return (error); 1186 1187 freehdrs: 1188 m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ 1189 m_freem(exthdrs.ip6e_dest1); 1190 m_freem(exthdrs.ip6e_rthdr); 1191 m_freem(exthdrs.ip6e_dest2); 1192 /* FALLTHROUGH */ 1193 bad: 1194 m_freem(m); 1195 goto done; 1196 } 1197 1198 static int 1199 ip6_copyexthdr(mp, hdr, hlen) 1200 struct mbuf **mp; 1201 caddr_t hdr; 1202 int hlen; 1203 { 1204 struct mbuf *m; 1205 1206 if (hlen > MCLBYTES) 1207 return (ENOBUFS); /* XXX */ 1208 1209 MGET(m, M_DONTWAIT, MT_DATA); 1210 if (!m) 1211 return (ENOBUFS); 1212 1213 if (hlen > MLEN) { 1214 MCLGET(m, M_DONTWAIT); 1215 if ((m->m_flags & M_EXT) == 0) { 1216 m_free(m); 1217 return (ENOBUFS); 1218 } 1219 } 1220 m->m_len = hlen; 1221 if (hdr) 1222 bcopy(hdr, mtod(m, caddr_t), hlen); 1223 1224 *mp = m; 1225 return (0); 1226 } 1227 1228 /* 1229 * Insert jumbo payload option. 1230 */ 1231 static int 1232 ip6_insert_jumboopt(exthdrs, plen) 1233 struct ip6_exthdrs *exthdrs; 1234 u_int32_t plen; 1235 { 1236 struct mbuf *mopt; 1237 u_char *optbuf; 1238 u_int32_t v; 1239 1240 #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ 1241 1242 /* 1243 * If there is no hop-by-hop options header, allocate new one. 1244 * If there is one but it doesn't have enough space to store the 1245 * jumbo payload option, allocate a cluster to store the whole options. 1246 * Otherwise, use it to store the options. 1247 */ 1248 if (exthdrs->ip6e_hbh == 0) { 1249 MGET(mopt, M_DONTWAIT, MT_DATA); 1250 if (mopt == 0) 1251 return (ENOBUFS); 1252 mopt->m_len = JUMBOOPTLEN; 1253 optbuf = mtod(mopt, u_char *); 1254 optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ 1255 exthdrs->ip6e_hbh = mopt; 1256 } else { 1257 struct ip6_hbh *hbh; 1258 1259 mopt = exthdrs->ip6e_hbh; 1260 if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { 1261 /* 1262 * XXX assumption: 1263 * - exthdrs->ip6e_hbh is not referenced from places 1264 * other than exthdrs. 1265 * - exthdrs->ip6e_hbh is not an mbuf chain. 1266 */ 1267 int oldoptlen = mopt->m_len; 1268 struct mbuf *n; 1269 1270 /* 1271 * XXX: give up if the whole (new) hbh header does 1272 * not fit even in an mbuf cluster. 1273 */ 1274 if (oldoptlen + JUMBOOPTLEN > MCLBYTES) 1275 return (ENOBUFS); 1276 1277 /* 1278 * As a consequence, we must always prepare a cluster 1279 * at this point. 1280 */ 1281 MGET(n, M_DONTWAIT, MT_DATA); 1282 if (n) { 1283 MCLGET(n, M_DONTWAIT); 1284 if ((n->m_flags & M_EXT) == 0) { 1285 m_freem(n); 1286 n = NULL; 1287 } 1288 } 1289 if (!n) 1290 return (ENOBUFS); 1291 n->m_len = oldoptlen + JUMBOOPTLEN; 1292 bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), 1293 oldoptlen); 1294 optbuf = mtod(n, caddr_t) + oldoptlen; 1295 m_freem(mopt); 1296 mopt = exthdrs->ip6e_hbh = n; 1297 } else { 1298 optbuf = mtod(mopt, u_char *) + mopt->m_len; 1299 mopt->m_len += JUMBOOPTLEN; 1300 } 1301 optbuf[0] = IP6OPT_PADN; 1302 optbuf[1] = 1; 1303 1304 /* 1305 * Adjust the header length according to the pad and 1306 * the jumbo payload option. 1307 */ 1308 hbh = mtod(mopt, struct ip6_hbh *); 1309 hbh->ip6h_len += (JUMBOOPTLEN >> 3); 1310 } 1311 1312 /* fill in the option. */ 1313 optbuf[2] = IP6OPT_JUMBO; 1314 optbuf[3] = 4; 1315 v = (u_int32_t)htonl(plen + JUMBOOPTLEN); 1316 bcopy(&v, &optbuf[4], sizeof(u_int32_t)); 1317 1318 /* finally, adjust the packet header length */ 1319 exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; 1320 1321 return (0); 1322 #undef JUMBOOPTLEN 1323 } 1324 1325 /* 1326 * Insert fragment header and copy unfragmentable header portions. 1327 */ 1328 static int 1329 ip6_insertfraghdr(m0, m, hlen, frghdrp) 1330 struct mbuf *m0, *m; 1331 int hlen; 1332 struct ip6_frag **frghdrp; 1333 { 1334 struct mbuf *n, *mlast; 1335 1336 if (hlen > sizeof(struct ip6_hdr)) { 1337 n = m_copym(m0, sizeof(struct ip6_hdr), 1338 hlen - sizeof(struct ip6_hdr), M_DONTWAIT); 1339 if (n == 0) 1340 return (ENOBUFS); 1341 m->m_next = n; 1342 } else 1343 n = m; 1344 1345 /* Search for the last mbuf of unfragmentable part. */ 1346 for (mlast = n; mlast->m_next; mlast = mlast->m_next) 1347 ; 1348 1349 if ((mlast->m_flags & M_EXT) == 0 && 1350 M_TRAILINGSPACE(mlast) >= sizeof(struct ip6_frag)) { 1351 /* use the trailing space of the last mbuf for the fragment hdr */ 1352 *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + 1353 mlast->m_len); 1354 mlast->m_len += sizeof(struct ip6_frag); 1355 m->m_pkthdr.len += sizeof(struct ip6_frag); 1356 } else { 1357 /* allocate a new mbuf for the fragment header */ 1358 struct mbuf *mfrg; 1359 1360 MGET(mfrg, M_DONTWAIT, MT_DATA); 1361 if (mfrg == 0) 1362 return (ENOBUFS); 1363 mfrg->m_len = sizeof(struct ip6_frag); 1364 *frghdrp = mtod(mfrg, struct ip6_frag *); 1365 mlast->m_next = mfrg; 1366 } 1367 1368 return (0); 1369 } 1370 1371 static int 1372 ip6_getpmtu(ro_pmtu, ro, ifp, dst, mtup, alwaysfragp) 1373 struct route_in6 *ro_pmtu, *ro; 1374 struct ifnet *ifp; 1375 struct in6_addr *dst; 1376 u_long *mtup; 1377 int *alwaysfragp; 1378 { 1379 u_int32_t mtu = 0; 1380 int alwaysfrag = 0; 1381 int error = 0; 1382 1383 if (ro_pmtu != ro) { 1384 /* The first hop and the final destination may differ. */ 1385 struct sockaddr_in6 *sa6_dst = 1386 (struct sockaddr_in6 *)&ro_pmtu->ro_dst; 1387 if (ro_pmtu->ro_rt && 1388 ((ro_pmtu->ro_rt->rt_flags & RTF_UP) == 0 || 1389 !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst))) { 1390 RTFREE(ro_pmtu->ro_rt); 1391 ro_pmtu->ro_rt = (struct rtentry *)NULL; 1392 } 1393 if (ro_pmtu->ro_rt == NULL) { 1394 bzero(sa6_dst, sizeof(*sa6_dst)); 1395 sa6_dst->sin6_family = AF_INET6; 1396 sa6_dst->sin6_len = sizeof(struct sockaddr_in6); 1397 sa6_dst->sin6_addr = *dst; 1398 1399 rtalloc((struct route *)ro_pmtu); 1400 } 1401 } 1402 if (ro_pmtu->ro_rt) { 1403 u_int32_t ifmtu; 1404 struct in_conninfo inc; 1405 1406 bzero(&inc, sizeof(inc)); 1407 inc.inc_flags = 1; /* IPv6 */ 1408 inc.inc6_faddr = *dst; 1409 1410 if (ifp == NULL) 1411 ifp = ro_pmtu->ro_rt->rt_ifp; 1412 ifmtu = IN6_LINKMTU(ifp); 1413 mtu = tcp_hc_getmtu(&inc); 1414 if (mtu) 1415 mtu = min(mtu, ro_pmtu->ro_rt->rt_rmx.rmx_mtu); 1416 else 1417 mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; 1418 if (mtu == 0) 1419 mtu = ifmtu; 1420 else if (mtu < IPV6_MMTU) { 1421 /* 1422 * RFC2460 section 5, last paragraph: 1423 * if we record ICMPv6 too big message with 1424 * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU 1425 * or smaller, with framgent header attached. 1426 * (fragment header is needed regardless from the 1427 * packet size, for translators to identify packets) 1428 */ 1429 alwaysfrag = 1; 1430 mtu = IPV6_MMTU; 1431 } else if (mtu > ifmtu) { 1432 /* 1433 * The MTU on the route is larger than the MTU on 1434 * the interface! This shouldn't happen, unless the 1435 * MTU of the interface has been changed after the 1436 * interface was brought up. Change the MTU in the 1437 * route to match the interface MTU (as long as the 1438 * field isn't locked). 1439 */ 1440 mtu = ifmtu; 1441 ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; 1442 } 1443 } else if (ifp) { 1444 mtu = IN6_LINKMTU(ifp); 1445 } else 1446 error = EHOSTUNREACH; /* XXX */ 1447 1448 *mtup = mtu; 1449 if (alwaysfragp) 1450 *alwaysfragp = alwaysfrag; 1451 return (error); 1452 } 1453 1454 /* 1455 * IP6 socket option processing. 1456 */ 1457 int 1458 ip6_ctloutput(so, sopt) 1459 struct socket *so; 1460 struct sockopt *sopt; 1461 { 1462 int privileged, optdatalen, uproto; 1463 void *optdata; 1464 struct inpcb *in6p = sotoinpcb(so); 1465 int error, optval; 1466 int level, op, optname; 1467 int optlen; 1468 struct thread *td; 1469 1470 if (sopt) { 1471 level = sopt->sopt_level; 1472 op = sopt->sopt_dir; 1473 optname = sopt->sopt_name; 1474 optlen = sopt->sopt_valsize; 1475 td = sopt->sopt_td; 1476 } else { 1477 panic("ip6_ctloutput: arg soopt is NULL"); 1478 } 1479 error = optval = 0; 1480 1481 privileged = (td == 0 || suser(td)) ? 0 : 1; 1482 uproto = (int)so->so_proto->pr_protocol; 1483 1484 if (level == IPPROTO_IPV6) { 1485 switch (op) { 1486 1487 case SOPT_SET: 1488 switch (optname) { 1489 case IPV6_2292PKTOPTIONS: 1490 #ifdef IPV6_PKTOPTIONS 1491 case IPV6_PKTOPTIONS: 1492 #endif 1493 { 1494 struct mbuf *m; 1495 1496 error = soopt_getm(sopt, &m); /* XXX */ 1497 if (error != 0) 1498 break; 1499 error = soopt_mcopyin(sopt, m); /* XXX */ 1500 if (error != 0) 1501 break; 1502 error = ip6_pcbopts(&in6p->in6p_outputopts, 1503 m, so, sopt); 1504 m_freem(m); /* XXX */ 1505 break; 1506 } 1507 1508 /* 1509 * Use of some Hop-by-Hop options or some 1510 * Destination options, might require special 1511 * privilege. That is, normal applications 1512 * (without special privilege) might be forbidden 1513 * from setting certain options in outgoing packets, 1514 * and might never see certain options in received 1515 * packets. [RFC 2292 Section 6] 1516 * KAME specific note: 1517 * KAME prevents non-privileged users from sending or 1518 * receiving ANY hbh/dst options in order to avoid 1519 * overhead of parsing options in the kernel. 1520 */ 1521 case IPV6_RECVHOPOPTS: 1522 case IPV6_RECVDSTOPTS: 1523 case IPV6_RECVRTHDRDSTOPTS: 1524 if (!privileged) { 1525 error = EPERM; 1526 break; 1527 } 1528 /* FALLTHROUGH */ 1529 case IPV6_UNICAST_HOPS: 1530 case IPV6_HOPLIMIT: 1531 case IPV6_FAITH: 1532 1533 case IPV6_RECVPKTINFO: 1534 case IPV6_RECVHOPLIMIT: 1535 case IPV6_RECVRTHDR: 1536 case IPV6_RECVPATHMTU: 1537 case IPV6_RECVTCLASS: 1538 case IPV6_V6ONLY: 1539 case IPV6_AUTOFLOWLABEL: 1540 if (optlen != sizeof(int)) { 1541 error = EINVAL; 1542 break; 1543 } 1544 error = sooptcopyin(sopt, &optval, 1545 sizeof optval, sizeof optval); 1546 if (error) 1547 break; 1548 switch (optname) { 1549 1550 case IPV6_UNICAST_HOPS: 1551 if (optval < -1 || optval >= 256) 1552 error = EINVAL; 1553 else { 1554 /* -1 = kernel default */ 1555 in6p->in6p_hops = optval; 1556 if ((in6p->in6p_vflag & 1557 INP_IPV4) != 0) 1558 in6p->inp_ip_ttl = optval; 1559 } 1560 break; 1561 #define OPTSET(bit) \ 1562 do { \ 1563 if (optval) \ 1564 in6p->in6p_flags |= (bit); \ 1565 else \ 1566 in6p->in6p_flags &= ~(bit); \ 1567 } while (/*CONSTCOND*/ 0) 1568 #define OPTSET2292(bit) \ 1569 do { \ 1570 in6p->in6p_flags |= IN6P_RFC2292; \ 1571 if (optval) \ 1572 in6p->in6p_flags |= (bit); \ 1573 else \ 1574 in6p->in6p_flags &= ~(bit); \ 1575 } while (/*CONSTCOND*/ 0) 1576 #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) 1577 1578 case IPV6_RECVPKTINFO: 1579 /* cannot mix with RFC2292 */ 1580 if (OPTBIT(IN6P_RFC2292)) { 1581 error = EINVAL; 1582 break; 1583 } 1584 OPTSET(IN6P_PKTINFO); 1585 break; 1586 1587 case IPV6_HOPLIMIT: 1588 { 1589 struct ip6_pktopts **optp; 1590 1591 /* cannot mix with RFC2292 */ 1592 if (OPTBIT(IN6P_RFC2292)) { 1593 error = EINVAL; 1594 break; 1595 } 1596 optp = &in6p->in6p_outputopts; 1597 error = ip6_pcbopt(IPV6_HOPLIMIT, 1598 (u_char *)&optval, 1599 sizeof(optval), 1600 optp, 1601 privileged, uproto); 1602 break; 1603 } 1604 1605 case IPV6_RECVHOPLIMIT: 1606 /* cannot mix with RFC2292 */ 1607 if (OPTBIT(IN6P_RFC2292)) { 1608 error = EINVAL; 1609 break; 1610 } 1611 OPTSET(IN6P_HOPLIMIT); 1612 break; 1613 1614 case IPV6_RECVHOPOPTS: 1615 /* cannot mix with RFC2292 */ 1616 if (OPTBIT(IN6P_RFC2292)) { 1617 error = EINVAL; 1618 break; 1619 } 1620 OPTSET(IN6P_HOPOPTS); 1621 break; 1622 1623 case IPV6_RECVDSTOPTS: 1624 /* cannot mix with RFC2292 */ 1625 if (OPTBIT(IN6P_RFC2292)) { 1626 error = EINVAL; 1627 break; 1628 } 1629 OPTSET(IN6P_DSTOPTS); 1630 break; 1631 1632 case IPV6_RECVRTHDRDSTOPTS: 1633 /* cannot mix with RFC2292 */ 1634 if (OPTBIT(IN6P_RFC2292)) { 1635 error = EINVAL; 1636 break; 1637 } 1638 OPTSET(IN6P_RTHDRDSTOPTS); 1639 break; 1640 1641 case IPV6_RECVRTHDR: 1642 /* cannot mix with RFC2292 */ 1643 if (OPTBIT(IN6P_RFC2292)) { 1644 error = EINVAL; 1645 break; 1646 } 1647 OPTSET(IN6P_RTHDR); 1648 break; 1649 1650 case IPV6_FAITH: 1651 OPTSET(IN6P_FAITH); 1652 break; 1653 1654 case IPV6_RECVPATHMTU: 1655 /* 1656 * We ignore this option for TCP 1657 * sockets. 1658 * (RFC3542 leaves this case 1659 * unspecified.) 1660 */ 1661 if (uproto != IPPROTO_TCP) 1662 OPTSET(IN6P_MTU); 1663 break; 1664 1665 case IPV6_V6ONLY: 1666 /* 1667 * make setsockopt(IPV6_V6ONLY) 1668 * available only prior to bind(2). 1669 * see ipng mailing list, Jun 22 2001. 1670 */ 1671 if (in6p->in6p_lport || 1672 !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { 1673 error = EINVAL; 1674 break; 1675 } 1676 OPTSET(IN6P_IPV6_V6ONLY); 1677 if (optval) 1678 in6p->in6p_vflag &= ~INP_IPV4; 1679 else 1680 in6p->in6p_vflag |= INP_IPV4; 1681 break; 1682 case IPV6_RECVTCLASS: 1683 /* cannot mix with RFC2292 XXX */ 1684 if (OPTBIT(IN6P_RFC2292)) { 1685 error = EINVAL; 1686 break; 1687 } 1688 OPTSET(IN6P_TCLASS); 1689 break; 1690 case IPV6_AUTOFLOWLABEL: 1691 OPTSET(IN6P_AUTOFLOWLABEL); 1692 break; 1693 1694 } 1695 break; 1696 1697 case IPV6_TCLASS: 1698 case IPV6_DONTFRAG: 1699 case IPV6_USE_MIN_MTU: 1700 case IPV6_PREFER_TEMPADDR: 1701 if (optlen != sizeof(optval)) { 1702 error = EINVAL; 1703 break; 1704 } 1705 error = sooptcopyin(sopt, &optval, 1706 sizeof optval, sizeof optval); 1707 if (error) 1708 break; 1709 { 1710 struct ip6_pktopts **optp; 1711 optp = &in6p->in6p_outputopts; 1712 error = ip6_pcbopt(optname, 1713 (u_char *)&optval, 1714 sizeof(optval), 1715 optp, 1716 privileged, uproto); 1717 break; 1718 } 1719 1720 case IPV6_2292PKTINFO: 1721 case IPV6_2292HOPLIMIT: 1722 case IPV6_2292HOPOPTS: 1723 case IPV6_2292DSTOPTS: 1724 case IPV6_2292RTHDR: 1725 /* RFC 2292 */ 1726 if (optlen != sizeof(int)) { 1727 error = EINVAL; 1728 break; 1729 } 1730 error = sooptcopyin(sopt, &optval, 1731 sizeof optval, sizeof optval); 1732 if (error) 1733 break; 1734 switch (optname) { 1735 case IPV6_2292PKTINFO: 1736 OPTSET2292(IN6P_PKTINFO); 1737 break; 1738 case IPV6_2292HOPLIMIT: 1739 OPTSET2292(IN6P_HOPLIMIT); 1740 break; 1741 case IPV6_2292HOPOPTS: 1742 /* 1743 * Check super-user privilege. 1744 * See comments for IPV6_RECVHOPOPTS. 1745 */ 1746 if (!privileged) 1747 return (EPERM); 1748 OPTSET2292(IN6P_HOPOPTS); 1749 break; 1750 case IPV6_2292DSTOPTS: 1751 if (!privileged) 1752 return (EPERM); 1753 OPTSET2292(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ 1754 break; 1755 case IPV6_2292RTHDR: 1756 OPTSET2292(IN6P_RTHDR); 1757 break; 1758 } 1759 break; 1760 case IPV6_PKTINFO: 1761 case IPV6_HOPOPTS: 1762 case IPV6_RTHDR: 1763 case IPV6_DSTOPTS: 1764 case IPV6_RTHDRDSTOPTS: 1765 case IPV6_NEXTHOP: 1766 { 1767 /* new advanced API (RFC3542) */ 1768 u_char *optbuf; 1769 u_char optbuf_storage[MCLBYTES]; 1770 int optlen; 1771 struct ip6_pktopts **optp; 1772 1773 /* cannot mix with RFC2292 */ 1774 if (OPTBIT(IN6P_RFC2292)) { 1775 error = EINVAL; 1776 break; 1777 } 1778 1779 /* 1780 * We only ensure valsize is not too large 1781 * here. Further validation will be done 1782 * later. 1783 */ 1784 error = sooptcopyin(sopt, optbuf_storage, 1785 sizeof(optbuf_storage), 0); 1786 if (error) 1787 break; 1788 optlen = sopt->sopt_valsize; 1789 optbuf = optbuf_storage; 1790 optp = &in6p->in6p_outputopts; 1791 error = ip6_pcbopt(optname, 1792 optbuf, optlen, 1793 optp, privileged, uproto); 1794 break; 1795 } 1796 #undef OPTSET 1797 1798 case IPV6_MULTICAST_IF: 1799 case IPV6_MULTICAST_HOPS: 1800 case IPV6_MULTICAST_LOOP: 1801 case IPV6_JOIN_GROUP: 1802 case IPV6_LEAVE_GROUP: 1803 { 1804 if (sopt->sopt_valsize > MLEN) { 1805 error = EMSGSIZE; 1806 break; 1807 } 1808 /* XXX */ 1809 } 1810 /* FALLTHROUGH */ 1811 { 1812 struct mbuf *m; 1813 1814 if (sopt->sopt_valsize > MCLBYTES) { 1815 error = EMSGSIZE; 1816 break; 1817 } 1818 /* XXX */ 1819 MGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT, MT_DATA); 1820 if (m == 0) { 1821 error = ENOBUFS; 1822 break; 1823 } 1824 if (sopt->sopt_valsize > MLEN) { 1825 MCLGET(m, sopt->sopt_td ? M_WAIT : M_DONTWAIT); 1826 if ((m->m_flags & M_EXT) == 0) { 1827 m_free(m); 1828 error = ENOBUFS; 1829 break; 1830 } 1831 } 1832 m->m_len = sopt->sopt_valsize; 1833 error = sooptcopyin(sopt, mtod(m, char *), 1834 m->m_len, m->m_len); 1835 if (error) { 1836 (void)m_free(m); 1837 break; 1838 } 1839 error = ip6_setmoptions(sopt->sopt_name, 1840 &in6p->in6p_moptions, 1841 m); 1842 (void)m_free(m); 1843 } 1844 break; 1845 1846 case IPV6_PORTRANGE: 1847 error = sooptcopyin(sopt, &optval, 1848 sizeof optval, sizeof optval); 1849 if (error) 1850 break; 1851 1852 switch (optval) { 1853 case IPV6_PORTRANGE_DEFAULT: 1854 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1855 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1856 break; 1857 1858 case IPV6_PORTRANGE_HIGH: 1859 in6p->in6p_flags &= ~(IN6P_LOWPORT); 1860 in6p->in6p_flags |= IN6P_HIGHPORT; 1861 break; 1862 1863 case IPV6_PORTRANGE_LOW: 1864 in6p->in6p_flags &= ~(IN6P_HIGHPORT); 1865 in6p->in6p_flags |= IN6P_LOWPORT; 1866 break; 1867 1868 default: 1869 error = EINVAL; 1870 break; 1871 } 1872 break; 1873 1874 #if defined(IPSEC) || defined(FAST_IPSEC) 1875 case IPV6_IPSEC_POLICY: 1876 { 1877 caddr_t req = NULL; 1878 size_t len = 0; 1879 struct mbuf *m; 1880 1881 if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ 1882 break; 1883 if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ 1884 break; 1885 if (m) { 1886 req = mtod(m, caddr_t); 1887 len = m->m_len; 1888 } 1889 error = ipsec6_set_policy(in6p, optname, req, 1890 len, privileged); 1891 m_freem(m); 1892 } 1893 break; 1894 #endif /* KAME IPSEC */ 1895 1896 case IPV6_FW_ADD: 1897 case IPV6_FW_DEL: 1898 case IPV6_FW_FLUSH: 1899 case IPV6_FW_ZERO: 1900 { 1901 struct mbuf *m; 1902 struct mbuf **mp = &m; 1903 1904 if (ip6_fw_ctl_ptr == NULL) 1905 return EINVAL; 1906 /* XXX */ 1907 if ((error = soopt_getm(sopt, &m)) != 0) 1908 break; 1909 /* XXX */ 1910 if ((error = soopt_mcopyin(sopt, m)) != 0) 1911 break; 1912 error = (*ip6_fw_ctl_ptr)(optname, mp); 1913 m = *mp; 1914 } 1915 break; 1916 1917 default: 1918 error = ENOPROTOOPT; 1919 break; 1920 } 1921 break; 1922 1923 case SOPT_GET: 1924 switch (optname) { 1925 1926 case IPV6_2292PKTOPTIONS: 1927 #ifdef IPV6_PKTOPTIONS 1928 case IPV6_PKTOPTIONS: 1929 #endif 1930 /* 1931 * RFC3542 (effectively) deprecated the 1932 * semantics of the 2292-style pktoptions. 1933 * Since it was not reliable in nature (i.e., 1934 * applications had to expect the lack of some 1935 * information after all), it would make sense 1936 * to simplify this part by always returning 1937 * empty data. 1938 */ 1939 sopt->sopt_valsize = 0; 1940 break; 1941 1942 case IPV6_RECVHOPOPTS: 1943 case IPV6_RECVDSTOPTS: 1944 case IPV6_RECVRTHDRDSTOPTS: 1945 case IPV6_UNICAST_HOPS: 1946 case IPV6_RECVPKTINFO: 1947 case IPV6_RECVHOPLIMIT: 1948 case IPV6_RECVRTHDR: 1949 case IPV6_RECVPATHMTU: 1950 1951 case IPV6_FAITH: 1952 case IPV6_V6ONLY: 1953 case IPV6_PORTRANGE: 1954 case IPV6_RECVTCLASS: 1955 case IPV6_AUTOFLOWLABEL: 1956 switch (optname) { 1957 1958 case IPV6_RECVHOPOPTS: 1959 optval = OPTBIT(IN6P_HOPOPTS); 1960 break; 1961 1962 case IPV6_RECVDSTOPTS: 1963 optval = OPTBIT(IN6P_DSTOPTS); 1964 break; 1965 1966 case IPV6_RECVRTHDRDSTOPTS: 1967 optval = OPTBIT(IN6P_RTHDRDSTOPTS); 1968 break; 1969 1970 case IPV6_UNICAST_HOPS: 1971 optval = in6p->in6p_hops; 1972 break; 1973 1974 case IPV6_RECVPKTINFO: 1975 optval = OPTBIT(IN6P_PKTINFO); 1976 break; 1977 1978 case IPV6_RECVHOPLIMIT: 1979 optval = OPTBIT(IN6P_HOPLIMIT); 1980 break; 1981 1982 case IPV6_RECVRTHDR: 1983 optval = OPTBIT(IN6P_RTHDR); 1984 break; 1985 1986 case IPV6_RECVPATHMTU: 1987 optval = OPTBIT(IN6P_MTU); 1988 break; 1989 1990 case IPV6_FAITH: 1991 optval = OPTBIT(IN6P_FAITH); 1992 break; 1993 1994 case IPV6_V6ONLY: 1995 optval = OPTBIT(IN6P_IPV6_V6ONLY); 1996 break; 1997 1998 case IPV6_PORTRANGE: 1999 { 2000 int flags; 2001 flags = in6p->in6p_flags; 2002 if (flags & IN6P_HIGHPORT) 2003 optval = IPV6_PORTRANGE_HIGH; 2004 else if (flags & IN6P_LOWPORT) 2005 optval = IPV6_PORTRANGE_LOW; 2006 else 2007 optval = 0; 2008 break; 2009 } 2010 case IPV6_RECVTCLASS: 2011 optval = OPTBIT(IN6P_TCLASS); 2012 break; 2013 2014 case IPV6_AUTOFLOWLABEL: 2015 optval = OPTBIT(IN6P_AUTOFLOWLABEL); 2016 break; 2017 } 2018 if (error) 2019 break; 2020 error = sooptcopyout(sopt, &optval, 2021 sizeof optval); 2022 break; 2023 2024 case IPV6_PATHMTU: 2025 { 2026 u_long pmtu = 0; 2027 struct ip6_mtuinfo mtuinfo; 2028 struct route_in6 sro; 2029 2030 bzero(&sro, sizeof(sro)); 2031 2032 if (!(so->so_state & SS_ISCONNECTED)) 2033 return (ENOTCONN); 2034 /* 2035 * XXX: we dot not consider the case of source 2036 * routing, or optional information to specify 2037 * the outgoing interface. 2038 */ 2039 error = ip6_getpmtu(&sro, NULL, NULL, 2040 &in6p->in6p_faddr, &pmtu, NULL); 2041 if (sro.ro_rt) 2042 RTFREE(sro.ro_rt); 2043 if (error) 2044 break; 2045 if (pmtu > IPV6_MAXPACKET) 2046 pmtu = IPV6_MAXPACKET; 2047 2048 bzero(&mtuinfo, sizeof(mtuinfo)); 2049 mtuinfo.ip6m_mtu = (u_int32_t)pmtu; 2050 optdata = (void *)&mtuinfo; 2051 optdatalen = sizeof(mtuinfo); 2052 error = sooptcopyout(sopt, optdata, 2053 optdatalen); 2054 break; 2055 } 2056 2057 case IPV6_2292PKTINFO: 2058 case IPV6_2292HOPLIMIT: 2059 case IPV6_2292HOPOPTS: 2060 case IPV6_2292RTHDR: 2061 case IPV6_2292DSTOPTS: 2062 switch (optname) { 2063 case IPV6_2292PKTINFO: 2064 optval = OPTBIT(IN6P_PKTINFO); 2065 break; 2066 case IPV6_2292HOPLIMIT: 2067 optval = OPTBIT(IN6P_HOPLIMIT); 2068 break; 2069 case IPV6_2292HOPOPTS: 2070 optval = OPTBIT(IN6P_HOPOPTS); 2071 break; 2072 case IPV6_2292RTHDR: 2073 optval = OPTBIT(IN6P_RTHDR); 2074 break; 2075 case IPV6_2292DSTOPTS: 2076 optval = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); 2077 break; 2078 } 2079 error = sooptcopyout(sopt, &optval, 2080 sizeof optval); 2081 break; 2082 case IPV6_PKTINFO: 2083 case IPV6_HOPOPTS: 2084 case IPV6_RTHDR: 2085 case IPV6_DSTOPTS: 2086 case IPV6_RTHDRDSTOPTS: 2087 case IPV6_NEXTHOP: 2088 case IPV6_TCLASS: 2089 case IPV6_DONTFRAG: 2090 case IPV6_USE_MIN_MTU: 2091 case IPV6_PREFER_TEMPADDR: 2092 error = ip6_getpcbopt(in6p->in6p_outputopts, 2093 optname, sopt); 2094 break; 2095 2096 case IPV6_MULTICAST_IF: 2097 case IPV6_MULTICAST_HOPS: 2098 case IPV6_MULTICAST_LOOP: 2099 case IPV6_JOIN_GROUP: 2100 case IPV6_LEAVE_GROUP: 2101 { 2102 struct mbuf *m; 2103 error = ip6_getmoptions(sopt->sopt_name, 2104 in6p->in6p_moptions, &m); 2105 if (error == 0) 2106 error = sooptcopyout(sopt, 2107 mtod(m, char *), m->m_len); 2108 m_freem(m); 2109 } 2110 break; 2111 2112 #if defined(IPSEC) || defined(FAST_IPSEC) 2113 case IPV6_IPSEC_POLICY: 2114 { 2115 caddr_t req = NULL; 2116 size_t len = 0; 2117 struct mbuf *m = NULL; 2118 struct mbuf **mp = &m; 2119 size_t ovalsize = sopt->sopt_valsize; 2120 caddr_t oval = (caddr_t)sopt->sopt_val; 2121 2122 error = soopt_getm(sopt, &m); /* XXX */ 2123 if (error != 0) 2124 break; 2125 error = soopt_mcopyin(sopt, m); /* XXX */ 2126 if (error != 0) 2127 break; 2128 sopt->sopt_valsize = ovalsize; 2129 sopt->sopt_val = oval; 2130 if (m) { 2131 req = mtod(m, caddr_t); 2132 len = m->m_len; 2133 } 2134 error = ipsec6_get_policy(in6p, req, len, mp); 2135 if (error == 0) 2136 error = soopt_mcopyout(sopt, m); /* XXX */ 2137 if (error == 0 && m) 2138 m_freem(m); 2139 break; 2140 } 2141 #endif /* KAME IPSEC */ 2142 2143 case IPV6_FW_GET: 2144 { 2145 struct mbuf *m; 2146 struct mbuf **mp = &m; 2147 2148 if (ip6_fw_ctl_ptr == NULL) 2149 { 2150 return EINVAL; 2151 } 2152 error = (*ip6_fw_ctl_ptr)(optname, mp); 2153 if (error == 0) 2154 error = soopt_mcopyout(sopt, m); /* XXX */ 2155 if (error == 0 && m) 2156 m_freem(m); 2157 } 2158 break; 2159 2160 default: 2161 error = ENOPROTOOPT; 2162 break; 2163 } 2164 break; 2165 } 2166 } else { /* level != IPPROTO_IPV6 */ 2167 error = EINVAL; 2168 } 2169 return (error); 2170 } 2171 2172 int 2173 ip6_raw_ctloutput(so, sopt) 2174 struct socket *so; 2175 struct sockopt *sopt; 2176 { 2177 int error = 0, optval, optlen; 2178 const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); 2179 struct in6pcb *in6p = sotoin6pcb(so); 2180 int level, op, optname; 2181 2182 if (sopt) { 2183 level = sopt->sopt_level; 2184 op = sopt->sopt_dir; 2185 optname = sopt->sopt_name; 2186 optlen = sopt->sopt_valsize; 2187 } else 2188 panic("ip6_raw_ctloutput: arg soopt is NULL"); 2189 2190 if (level != IPPROTO_IPV6) { 2191 return (EINVAL); 2192 } 2193 2194 switch (optname) { 2195 case IPV6_CHECKSUM: 2196 /* 2197 * For ICMPv6 sockets, no modification allowed for checksum 2198 * offset, permit "no change" values to help existing apps. 2199 * 2200 * RFC3542 says: "An attempt to set IPV6_CHECKSUM 2201 * for an ICMPv6 socket will fail." 2202 * The current behavior does not meet RFC3542. 2203 */ 2204 switch (op) { 2205 case SOPT_SET: 2206 if (optlen != sizeof(int)) { 2207 error = EINVAL; 2208 break; 2209 } 2210 error = sooptcopyin(sopt, &optval, sizeof(optval), 2211 sizeof(optval)); 2212 if (error) 2213 break; 2214 if ((optval % 2) != 0) { 2215 /* the API assumes even offset values */ 2216 error = EINVAL; 2217 } else if (so->so_proto->pr_protocol == 2218 IPPROTO_ICMPV6) { 2219 if (optval != icmp6off) 2220 error = EINVAL; 2221 } else 2222 in6p->in6p_cksum = optval; 2223 break; 2224 2225 case SOPT_GET: 2226 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) 2227 optval = icmp6off; 2228 else 2229 optval = in6p->in6p_cksum; 2230 2231 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2232 break; 2233 2234 default: 2235 error = EINVAL; 2236 break; 2237 } 2238 break; 2239 2240 default: 2241 error = ENOPROTOOPT; 2242 break; 2243 } 2244 2245 return (error); 2246 } 2247 2248 /* 2249 * Set up IP6 options in pcb for insertion in output packets or 2250 * specifying behavior of outgoing packets. 2251 */ 2252 static int 2253 ip6_pcbopts(pktopt, m, so, sopt) 2254 struct ip6_pktopts **pktopt; 2255 struct mbuf *m; 2256 struct socket *so; 2257 struct sockopt *sopt; 2258 { 2259 struct ip6_pktopts *opt = *pktopt; 2260 int error = 0; 2261 struct thread *td = sopt->sopt_td; 2262 int priv = 0; 2263 2264 /* turn off any old options. */ 2265 if (opt) { 2266 #ifdef DIAGNOSTIC 2267 if (opt->ip6po_pktinfo || opt->ip6po_nexthop || 2268 opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || 2269 opt->ip6po_rhinfo.ip6po_rhi_rthdr) 2270 printf("ip6_pcbopts: all specified options are cleared.\n"); 2271 #endif 2272 ip6_clearpktopts(opt, -1); 2273 } else 2274 opt = malloc(sizeof(*opt), M_IP6OPT, M_WAITOK); 2275 *pktopt = NULL; 2276 2277 if (!m || m->m_len == 0) { 2278 /* 2279 * Only turning off any previous options, regardless of 2280 * whether the opt is just created or given. 2281 */ 2282 free(opt, M_IP6OPT); 2283 return (0); 2284 } 2285 2286 /* set options specified by user. */ 2287 if (td && !suser(td)) 2288 priv = 1; 2289 if ((error = ip6_setpktopts(m, opt, NULL, priv, 2290 so->so_proto->pr_protocol)) != 0) { 2291 ip6_clearpktopts(opt, -1); /* XXX: discard all options */ 2292 free(opt, M_IP6OPT); 2293 return (error); 2294 } 2295 *pktopt = opt; 2296 return (0); 2297 } 2298 2299 /* 2300 * initialize ip6_pktopts. beware that there are non-zero default values in 2301 * the struct. 2302 */ 2303 void 2304 ip6_initpktopts(opt) 2305 struct ip6_pktopts *opt; 2306 { 2307 2308 bzero(opt, sizeof(*opt)); 2309 opt->ip6po_hlim = -1; /* -1 means default hop limit */ 2310 opt->ip6po_tclass = -1; /* -1 means default traffic class */ 2311 opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; 2312 opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; 2313 } 2314 2315 static int 2316 ip6_pcbopt(optname, buf, len, pktopt, priv, uproto) 2317 int optname, len, priv; 2318 u_char *buf; 2319 struct ip6_pktopts **pktopt; 2320 int uproto; 2321 { 2322 struct ip6_pktopts *opt; 2323 2324 if (*pktopt == NULL) { 2325 *pktopt = malloc(sizeof(struct ip6_pktopts), M_IP6OPT, 2326 M_WAITOK); 2327 ip6_initpktopts(*pktopt); 2328 } 2329 opt = *pktopt; 2330 2331 return (ip6_setpktopt(optname, buf, len, opt, priv, 1, 0, uproto)); 2332 } 2333 2334 static int 2335 ip6_getpcbopt(pktopt, optname, sopt) 2336 struct ip6_pktopts *pktopt; 2337 struct sockopt *sopt; 2338 int optname; 2339 { 2340 void *optdata = NULL; 2341 int optdatalen = 0; 2342 struct ip6_ext *ip6e; 2343 int error = 0; 2344 struct in6_pktinfo null_pktinfo; 2345 int deftclass = 0, on; 2346 int defminmtu = IP6PO_MINMTU_MCASTONLY; 2347 int defpreftemp = IP6PO_TEMPADDR_SYSTEM; 2348 2349 switch (optname) { 2350 case IPV6_PKTINFO: 2351 if (pktopt && pktopt->ip6po_pktinfo) 2352 optdata = (void *)pktopt->ip6po_pktinfo; 2353 else { 2354 /* XXX: we don't have to do this every time... */ 2355 bzero(&null_pktinfo, sizeof(null_pktinfo)); 2356 optdata = (void *)&null_pktinfo; 2357 } 2358 optdatalen = sizeof(struct in6_pktinfo); 2359 break; 2360 case IPV6_TCLASS: 2361 if (pktopt && pktopt->ip6po_tclass >= 0) 2362 optdata = (void *)&pktopt->ip6po_tclass; 2363 else 2364 optdata = (void *)&deftclass; 2365 optdatalen = sizeof(int); 2366 break; 2367 case IPV6_HOPOPTS: 2368 if (pktopt && pktopt->ip6po_hbh) { 2369 optdata = (void *)pktopt->ip6po_hbh; 2370 ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; 2371 optdatalen = (ip6e->ip6e_len + 1) << 3; 2372 } 2373 break; 2374 case IPV6_RTHDR: 2375 if (pktopt && pktopt->ip6po_rthdr) { 2376 optdata = (void *)pktopt->ip6po_rthdr; 2377 ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; 2378 optdatalen = (ip6e->ip6e_len + 1) << 3; 2379 } 2380 break; 2381 case IPV6_RTHDRDSTOPTS: 2382 if (pktopt && pktopt->ip6po_dest1) { 2383 optdata = (void *)pktopt->ip6po_dest1; 2384 ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; 2385 optdatalen = (ip6e->ip6e_len + 1) << 3; 2386 } 2387 break; 2388 case IPV6_DSTOPTS: 2389 if (pktopt && pktopt->ip6po_dest2) { 2390 optdata = (void *)pktopt->ip6po_dest2; 2391 ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; 2392 optdatalen = (ip6e->ip6e_len + 1) << 3; 2393 } 2394 break; 2395 case IPV6_NEXTHOP: 2396 if (pktopt && pktopt->ip6po_nexthop) { 2397 optdata = (void *)pktopt->ip6po_nexthop; 2398 optdatalen = pktopt->ip6po_nexthop->sa_len; 2399 } 2400 break; 2401 case IPV6_USE_MIN_MTU: 2402 if (pktopt) 2403 optdata = (void *)&pktopt->ip6po_minmtu; 2404 else 2405 optdata = (void *)&defminmtu; 2406 optdatalen = sizeof(int); 2407 break; 2408 case IPV6_DONTFRAG: 2409 if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) 2410 on = 1; 2411 else 2412 on = 0; 2413 optdata = (void *)&on; 2414 optdatalen = sizeof(on); 2415 break; 2416 case IPV6_PREFER_TEMPADDR: 2417 if (pktopt) 2418 optdata = (void *)&pktopt->ip6po_prefer_tempaddr; 2419 else 2420 optdata = (void *)&defpreftemp; 2421 optdatalen = sizeof(int); 2422 break; 2423 default: /* should not happen */ 2424 #ifdef DIAGNOSTIC 2425 panic("ip6_getpcbopt: unexpected option\n"); 2426 #endif 2427 return (ENOPROTOOPT); 2428 } 2429 2430 error = sooptcopyout(sopt, optdata, optdatalen); 2431 2432 return (error); 2433 } 2434 2435 void 2436 ip6_clearpktopts(pktopt, optname) 2437 struct ip6_pktopts *pktopt; 2438 int optname; 2439 { 2440 if (pktopt == NULL) 2441 return; 2442 2443 if (optname == -1 || optname == IPV6_PKTINFO) { 2444 if (pktopt->ip6po_pktinfo) 2445 free(pktopt->ip6po_pktinfo, M_IP6OPT); 2446 pktopt->ip6po_pktinfo = NULL; 2447 } 2448 if (optname == -1 || optname == IPV6_HOPLIMIT) 2449 pktopt->ip6po_hlim = -1; 2450 if (optname == -1 || optname == IPV6_TCLASS) 2451 pktopt->ip6po_tclass = -1; 2452 if (optname == -1 || optname == IPV6_NEXTHOP) { 2453 if (pktopt->ip6po_nextroute.ro_rt) { 2454 RTFREE(pktopt->ip6po_nextroute.ro_rt); 2455 pktopt->ip6po_nextroute.ro_rt = NULL; 2456 } 2457 if (pktopt->ip6po_nexthop) 2458 free(pktopt->ip6po_nexthop, M_IP6OPT); 2459 pktopt->ip6po_nexthop = NULL; 2460 } 2461 if (optname == -1 || optname == IPV6_HOPOPTS) { 2462 if (pktopt->ip6po_hbh) 2463 free(pktopt->ip6po_hbh, M_IP6OPT); 2464 pktopt->ip6po_hbh = NULL; 2465 } 2466 if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { 2467 if (pktopt->ip6po_dest1) 2468 free(pktopt->ip6po_dest1, M_IP6OPT); 2469 pktopt->ip6po_dest1 = NULL; 2470 } 2471 if (optname == -1 || optname == IPV6_RTHDR) { 2472 if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) 2473 free(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); 2474 pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; 2475 if (pktopt->ip6po_route.ro_rt) { 2476 RTFREE(pktopt->ip6po_route.ro_rt); 2477 pktopt->ip6po_route.ro_rt = NULL; 2478 } 2479 } 2480 if (optname == -1 || optname == IPV6_DSTOPTS) { 2481 if (pktopt->ip6po_dest2) 2482 free(pktopt->ip6po_dest2, M_IP6OPT); 2483 pktopt->ip6po_dest2 = NULL; 2484 } 2485 } 2486 2487 #define PKTOPT_EXTHDRCPY(type) \ 2488 do {\ 2489 if (src->type) {\ 2490 int hlen = (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ 2491 dst->type = malloc(hlen, M_IP6OPT, canwait);\ 2492 if (dst->type == NULL && canwait == M_NOWAIT)\ 2493 goto bad;\ 2494 bcopy(src->type, dst->type, hlen);\ 2495 }\ 2496 } while (/*CONSTCOND*/ 0) 2497 2498 static int 2499 copypktopts(dst, src, canwait) 2500 struct ip6_pktopts *dst, *src; 2501 int canwait; 2502 { 2503 if (dst == NULL || src == NULL) { 2504 printf("ip6_clearpktopts: invalid argument\n"); 2505 return (EINVAL); 2506 } 2507 2508 dst->ip6po_hlim = src->ip6po_hlim; 2509 dst->ip6po_tclass = src->ip6po_tclass; 2510 dst->ip6po_flags = src->ip6po_flags; 2511 if (src->ip6po_pktinfo) { 2512 dst->ip6po_pktinfo = malloc(sizeof(*dst->ip6po_pktinfo), 2513 M_IP6OPT, canwait); 2514 if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) 2515 goto bad; 2516 *dst->ip6po_pktinfo = *src->ip6po_pktinfo; 2517 } 2518 if (src->ip6po_nexthop) { 2519 dst->ip6po_nexthop = malloc(src->ip6po_nexthop->sa_len, 2520 M_IP6OPT, canwait); 2521 if (dst->ip6po_nexthop == NULL) 2522 goto bad; 2523 bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, 2524 src->ip6po_nexthop->sa_len); 2525 } 2526 PKTOPT_EXTHDRCPY(ip6po_hbh); 2527 PKTOPT_EXTHDRCPY(ip6po_dest1); 2528 PKTOPT_EXTHDRCPY(ip6po_dest2); 2529 PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ 2530 return (0); 2531 2532 bad: 2533 ip6_clearpktopts(dst, -1); 2534 return (ENOBUFS); 2535 } 2536 #undef PKTOPT_EXTHDRCPY 2537 2538 struct ip6_pktopts * 2539 ip6_copypktopts(src, canwait) 2540 struct ip6_pktopts *src; 2541 int canwait; 2542 { 2543 int error; 2544 struct ip6_pktopts *dst; 2545 2546 dst = malloc(sizeof(*dst), M_IP6OPT, canwait); 2547 if (dst == NULL && canwait == M_NOWAIT) 2548 return (NULL); 2549 ip6_initpktopts(dst); 2550 2551 if ((error = copypktopts(dst, src, canwait)) != 0) { 2552 free(dst, M_IP6OPT); 2553 return (NULL); 2554 } 2555 2556 return (dst); 2557 } 2558 2559 void 2560 ip6_freepcbopts(pktopt) 2561 struct ip6_pktopts *pktopt; 2562 { 2563 if (pktopt == NULL) 2564 return; 2565 2566 ip6_clearpktopts(pktopt, -1); 2567 2568 free(pktopt, M_IP6OPT); 2569 } 2570 2571 /* 2572 * Set the IP6 multicast options in response to user setsockopt(). 2573 */ 2574 static int 2575 ip6_setmoptions(optname, im6op, m) 2576 int optname; 2577 struct ip6_moptions **im6op; 2578 struct mbuf *m; 2579 { 2580 int error = 0; 2581 u_int loop, ifindex; 2582 struct ipv6_mreq *mreq; 2583 struct ifnet *ifp; 2584 struct ip6_moptions *im6o = *im6op; 2585 struct route_in6 ro; 2586 struct in6_multi_mship *imm; 2587 struct thread *td = curthread; 2588 2589 if (im6o == NULL) { 2590 /* 2591 * No multicast option buffer attached to the pcb; 2592 * allocate one and initialize to default values. 2593 */ 2594 im6o = (struct ip6_moptions *) 2595 malloc(sizeof(*im6o), M_IP6MOPTS, M_WAITOK); 2596 2597 if (im6o == NULL) 2598 return (ENOBUFS); 2599 *im6op = im6o; 2600 im6o->im6o_multicast_ifp = NULL; 2601 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2602 im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; 2603 LIST_INIT(&im6o->im6o_memberships); 2604 } 2605 2606 switch (optname) { 2607 2608 case IPV6_MULTICAST_IF: 2609 /* 2610 * Select the interface for outgoing multicast packets. 2611 */ 2612 if (m == NULL || m->m_len != sizeof(u_int)) { 2613 error = EINVAL; 2614 break; 2615 } 2616 bcopy(mtod(m, u_int *), &ifindex, sizeof(ifindex)); 2617 if (ifindex < 0 || if_index < ifindex) { 2618 error = ENXIO; /* XXX EINVAL? */ 2619 break; 2620 } 2621 ifp = ifnet_byindex(ifindex); 2622 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2623 error = EADDRNOTAVAIL; 2624 break; 2625 } 2626 im6o->im6o_multicast_ifp = ifp; 2627 break; 2628 2629 case IPV6_MULTICAST_HOPS: 2630 { 2631 /* 2632 * Set the IP6 hoplimit for outgoing multicast packets. 2633 */ 2634 int optval; 2635 if (m == NULL || m->m_len != sizeof(int)) { 2636 error = EINVAL; 2637 break; 2638 } 2639 bcopy(mtod(m, u_int *), &optval, sizeof(optval)); 2640 if (optval < -1 || optval >= 256) 2641 error = EINVAL; 2642 else if (optval == -1) 2643 im6o->im6o_multicast_hlim = ip6_defmcasthlim; 2644 else 2645 im6o->im6o_multicast_hlim = optval; 2646 break; 2647 } 2648 2649 case IPV6_MULTICAST_LOOP: 2650 /* 2651 * Set the loopback flag for outgoing multicast packets. 2652 * Must be zero or one. 2653 */ 2654 if (m == NULL || m->m_len != sizeof(u_int)) { 2655 error = EINVAL; 2656 break; 2657 } 2658 bcopy(mtod(m, u_int *), &loop, sizeof(loop)); 2659 if (loop > 1) { 2660 error = EINVAL; 2661 break; 2662 } 2663 im6o->im6o_multicast_loop = loop; 2664 break; 2665 2666 case IPV6_JOIN_GROUP: 2667 /* 2668 * Add a multicast group membership. 2669 * Group must be a valid IP6 multicast address. 2670 */ 2671 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2672 error = EINVAL; 2673 break; 2674 } 2675 mreq = mtod(m, struct ipv6_mreq *); 2676 2677 if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 2678 /* 2679 * We use the unspecified address to specify to accept 2680 * all multicast addresses. Only super user is allowed 2681 * to do this. 2682 */ 2683 if (suser(td)) { 2684 error = EACCES; 2685 break; 2686 } 2687 } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { 2688 error = EINVAL; 2689 break; 2690 } 2691 2692 /* 2693 * If no interface was explicitly specified, choose an 2694 * appropriate one according to the given multicast address. 2695 */ 2696 if (mreq->ipv6mr_interface == 0) { 2697 struct sockaddr_in6 *dst; 2698 2699 /* 2700 * Look up the routing table for the 2701 * address, and choose the outgoing interface. 2702 * XXX: is it a good approach? 2703 */ 2704 ro.ro_rt = NULL; 2705 dst = (struct sockaddr_in6 *)&ro.ro_dst; 2706 bzero(dst, sizeof(*dst)); 2707 dst->sin6_family = AF_INET6; 2708 dst->sin6_len = sizeof(*dst); 2709 dst->sin6_addr = mreq->ipv6mr_multiaddr; 2710 rtalloc((struct route *)&ro); 2711 if (ro.ro_rt == NULL) { 2712 error = EADDRNOTAVAIL; 2713 break; 2714 } 2715 ifp = ro.ro_rt->rt_ifp; 2716 RTFREE(ro.ro_rt); 2717 } else { 2718 /* 2719 * If the interface is specified, validate it. 2720 */ 2721 if (mreq->ipv6mr_interface < 0 || 2722 if_index < mreq->ipv6mr_interface) { 2723 error = ENXIO; /* XXX EINVAL? */ 2724 break; 2725 } 2726 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2727 if (!ifp) { 2728 error = ENXIO; /* XXX EINVAL? */ 2729 break; 2730 } 2731 } 2732 2733 /* 2734 * See if we found an interface, and confirm that it 2735 * supports multicast 2736 */ 2737 if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { 2738 error = EADDRNOTAVAIL; 2739 break; 2740 } 2741 2742 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2743 error = EADDRNOTAVAIL; /* XXX: should not happen */ 2744 break; 2745 } 2746 2747 /* 2748 * See if the membership already exists. 2749 */ 2750 for (imm = im6o->im6o_memberships.lh_first; 2751 imm != NULL; imm = imm->i6mm_chain.le_next) 2752 if (imm->i6mm_maddr->in6m_ifp == ifp && 2753 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2754 &mreq->ipv6mr_multiaddr)) 2755 break; 2756 if (imm != NULL) { 2757 error = EADDRINUSE; 2758 break; 2759 } 2760 /* 2761 * Everything looks good; add a new record to the multicast 2762 * address list for the given interface. 2763 */ 2764 imm = in6_joingroup(ifp, &mreq->ipv6mr_multiaddr, &error, 0); 2765 if (imm == NULL) 2766 break; 2767 LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); 2768 break; 2769 2770 case IPV6_LEAVE_GROUP: 2771 /* 2772 * Drop a multicast group membership. 2773 * Group must be a valid IP6 multicast address. 2774 */ 2775 if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { 2776 error = EINVAL; 2777 break; 2778 } 2779 mreq = mtod(m, struct ipv6_mreq *); 2780 2781 /* 2782 * If an interface address was specified, get a pointer 2783 * to its ifnet structure. 2784 */ 2785 if (mreq->ipv6mr_interface < 0 || 2786 if_index < mreq->ipv6mr_interface) { 2787 error = ENXIO; /* XXX EINVAL? */ 2788 break; 2789 } 2790 if (mreq->ipv6mr_interface == 0) 2791 ifp = NULL; 2792 else 2793 ifp = ifnet_byindex(mreq->ipv6mr_interface); 2794 2795 /* Fill in the scope zone ID */ 2796 if (ifp) { 2797 if (in6_setscope(&mreq->ipv6mr_multiaddr, ifp, NULL)) { 2798 /* XXX: should not happen */ 2799 error = EADDRNOTAVAIL; 2800 break; 2801 } 2802 } else if (mreq->ipv6mr_interface != 0) { 2803 /* 2804 * This case happens when the (positive) index is in 2805 * the valid range, but the corresponding interface has 2806 * been detached dynamically (XXX). 2807 */ 2808 error = EADDRNOTAVAIL; 2809 break; 2810 } else { /* ipv6mr_interface == 0 */ 2811 struct sockaddr_in6 sa6_mc; 2812 2813 /* 2814 * The API spec says as follows: 2815 * If the interface index is specified as 0, the 2816 * system may choose a multicast group membership to 2817 * drop by matching the multicast address only. 2818 * On the other hand, we cannot disambiguate the scope 2819 * zone unless an interface is provided. Thus, we 2820 * check if there's ambiguity with the default scope 2821 * zone as the last resort. 2822 */ 2823 bzero(&sa6_mc, sizeof(sa6_mc)); 2824 sa6_mc.sin6_family = AF_INET6; 2825 sa6_mc.sin6_len = sizeof(sa6_mc); 2826 sa6_mc.sin6_addr = mreq->ipv6mr_multiaddr; 2827 error = sa6_embedscope(&sa6_mc, ip6_use_defzone); 2828 if (error != 0) 2829 break; 2830 mreq->ipv6mr_multiaddr = sa6_mc.sin6_addr; 2831 } 2832 2833 /* 2834 * Find the membership in the membership list. 2835 */ 2836 for (imm = im6o->im6o_memberships.lh_first; 2837 imm != NULL; imm = imm->i6mm_chain.le_next) { 2838 if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && 2839 IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, 2840 &mreq->ipv6mr_multiaddr)) 2841 break; 2842 } 2843 if (imm == NULL) { 2844 /* Unable to resolve interface */ 2845 error = EADDRNOTAVAIL; 2846 break; 2847 } 2848 /* 2849 * Give up the multicast address record to which the 2850 * membership points. 2851 */ 2852 LIST_REMOVE(imm, i6mm_chain); 2853 in6_delmulti(imm->i6mm_maddr); 2854 free(imm, M_IP6MADDR); 2855 break; 2856 2857 default: 2858 error = EOPNOTSUPP; 2859 break; 2860 } 2861 2862 /* 2863 * If all options have default values, no need to keep the mbuf. 2864 */ 2865 if (im6o->im6o_multicast_ifp == NULL && 2866 im6o->im6o_multicast_hlim == ip6_defmcasthlim && 2867 im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && 2868 im6o->im6o_memberships.lh_first == NULL) { 2869 free(*im6op, M_IP6MOPTS); 2870 *im6op = NULL; 2871 } 2872 2873 return (error); 2874 } 2875 2876 /* 2877 * Return the IP6 multicast options in response to user getsockopt(). 2878 */ 2879 static int 2880 ip6_getmoptions(optname, im6o, mp) 2881 int optname; 2882 struct ip6_moptions *im6o; 2883 struct mbuf **mp; 2884 { 2885 u_int *hlim, *loop, *ifindex; 2886 2887 *mp = m_get(M_TRYWAIT, MT_HEADER); /* XXX */ 2888 2889 switch (optname) { 2890 2891 case IPV6_MULTICAST_IF: 2892 ifindex = mtod(*mp, u_int *); 2893 (*mp)->m_len = sizeof(u_int); 2894 if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) 2895 *ifindex = 0; 2896 else 2897 *ifindex = im6o->im6o_multicast_ifp->if_index; 2898 return (0); 2899 2900 case IPV6_MULTICAST_HOPS: 2901 hlim = mtod(*mp, u_int *); 2902 (*mp)->m_len = sizeof(u_int); 2903 if (im6o == NULL) 2904 *hlim = ip6_defmcasthlim; 2905 else 2906 *hlim = im6o->im6o_multicast_hlim; 2907 return (0); 2908 2909 case IPV6_MULTICAST_LOOP: 2910 loop = mtod(*mp, u_int *); 2911 (*mp)->m_len = sizeof(u_int); 2912 if (im6o == NULL) 2913 *loop = ip6_defmcasthlim; 2914 else 2915 *loop = im6o->im6o_multicast_loop; 2916 return (0); 2917 2918 default: 2919 return (EOPNOTSUPP); 2920 } 2921 } 2922 2923 /* 2924 * Discard the IP6 multicast options. 2925 */ 2926 void 2927 ip6_freemoptions(im6o) 2928 struct ip6_moptions *im6o; 2929 { 2930 struct in6_multi_mship *imm; 2931 2932 if (im6o == NULL) 2933 return; 2934 2935 while ((imm = im6o->im6o_memberships.lh_first) != NULL) { 2936 LIST_REMOVE(imm, i6mm_chain); 2937 if (imm->i6mm_maddr) 2938 in6_delmulti(imm->i6mm_maddr); 2939 free(imm, M_IP6MADDR); 2940 } 2941 free(im6o, M_IP6MOPTS); 2942 } 2943 2944 /* 2945 * Set IPv6 outgoing packet options based on advanced API. 2946 */ 2947 int 2948 ip6_setpktopts(control, opt, stickyopt, priv, uproto) 2949 struct mbuf *control; 2950 struct ip6_pktopts *opt, *stickyopt; 2951 int priv, uproto; 2952 { 2953 struct cmsghdr *cm = 0; 2954 2955 if (control == NULL || opt == NULL) 2956 return (EINVAL); 2957 2958 ip6_initpktopts(opt); 2959 if (stickyopt) { 2960 int error; 2961 2962 /* 2963 * If stickyopt is provided, make a local copy of the options 2964 * for this particular packet, then override them by ancillary 2965 * objects. 2966 * XXX: copypktopts() does not copy the cached route to a next 2967 * hop (if any). This is not very good in terms of efficiency, 2968 * but we can allow this since this option should be rarely 2969 * used. 2970 */ 2971 if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) 2972 return (error); 2973 } 2974 2975 /* 2976 * XXX: Currently, we assume all the optional information is stored 2977 * in a single mbuf. 2978 */ 2979 if (control->m_next) 2980 return (EINVAL); 2981 2982 for (; control->m_len > 0; control->m_data += CMSG_ALIGN(cm->cmsg_len), 2983 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { 2984 int error; 2985 2986 if (control->m_len < CMSG_LEN(0)) 2987 return (EINVAL); 2988 2989 cm = mtod(control, struct cmsghdr *); 2990 if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) 2991 return (EINVAL); 2992 if (cm->cmsg_level != IPPROTO_IPV6) 2993 continue; 2994 2995 error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), 2996 cm->cmsg_len - CMSG_LEN(0), opt, priv, 0, 1, uproto); 2997 if (error) 2998 return (error); 2999 } 3000 3001 return (0); 3002 } 3003 3004 /* 3005 * Set a particular packet option, as a sticky option or an ancillary data 3006 * item. "len" can be 0 only when it's a sticky option. 3007 * We have 4 cases of combination of "sticky" and "cmsg": 3008 * "sticky=0, cmsg=0": impossible 3009 * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data 3010 * "sticky=1, cmsg=0": RFC3542 socket option 3011 * "sticky=1, cmsg=1": RFC2292 socket option 3012 */ 3013 static int 3014 ip6_setpktopt(optname, buf, len, opt, priv, sticky, cmsg, uproto) 3015 int optname, len, priv, sticky, cmsg, uproto; 3016 u_char *buf; 3017 struct ip6_pktopts *opt; 3018 { 3019 int minmtupolicy, preftemp; 3020 3021 if (!sticky && !cmsg) { 3022 #ifdef DIAGNOSTIC 3023 printf("ip6_setpktopt: impossible case\n"); 3024 #endif 3025 return (EINVAL); 3026 } 3027 3028 /* 3029 * IPV6_2292xxx is for backward compatibility to RFC2292, and should 3030 * not be specified in the context of RFC3542. Conversely, 3031 * RFC3542 types should not be specified in the context of RFC2292. 3032 */ 3033 if (!cmsg) { 3034 switch (optname) { 3035 case IPV6_2292PKTINFO: 3036 case IPV6_2292HOPLIMIT: 3037 case IPV6_2292NEXTHOP: 3038 case IPV6_2292HOPOPTS: 3039 case IPV6_2292DSTOPTS: 3040 case IPV6_2292RTHDR: 3041 case IPV6_2292PKTOPTIONS: 3042 return (ENOPROTOOPT); 3043 } 3044 } 3045 if (sticky && cmsg) { 3046 switch (optname) { 3047 case IPV6_PKTINFO: 3048 case IPV6_HOPLIMIT: 3049 case IPV6_NEXTHOP: 3050 case IPV6_HOPOPTS: 3051 case IPV6_DSTOPTS: 3052 case IPV6_RTHDRDSTOPTS: 3053 case IPV6_RTHDR: 3054 case IPV6_USE_MIN_MTU: 3055 case IPV6_DONTFRAG: 3056 case IPV6_TCLASS: 3057 case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ 3058 return (ENOPROTOOPT); 3059 } 3060 } 3061 3062 switch (optname) { 3063 case IPV6_2292PKTINFO: 3064 case IPV6_PKTINFO: 3065 { 3066 struct ifnet *ifp = NULL; 3067 struct in6_pktinfo *pktinfo; 3068 3069 if (len != sizeof(struct in6_pktinfo)) 3070 return (EINVAL); 3071 3072 pktinfo = (struct in6_pktinfo *)buf; 3073 3074 /* 3075 * An application can clear any sticky IPV6_PKTINFO option by 3076 * doing a "regular" setsockopt with ipi6_addr being 3077 * in6addr_any and ipi6_ifindex being zero. 3078 * [RFC 3542, Section 6] 3079 */ 3080 if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && 3081 pktinfo->ipi6_ifindex == 0 && 3082 IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3083 ip6_clearpktopts(opt, optname); 3084 break; 3085 } 3086 3087 if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && 3088 sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { 3089 return (EINVAL); 3090 } 3091 3092 /* validate the interface index if specified. */ 3093 if (pktinfo->ipi6_ifindex > if_index || 3094 pktinfo->ipi6_ifindex < 0) { 3095 return (ENXIO); 3096 } 3097 if (pktinfo->ipi6_ifindex) { 3098 ifp = ifnet_byindex(pktinfo->ipi6_ifindex); 3099 if (ifp == NULL) 3100 return (ENXIO); 3101 } 3102 3103 /* 3104 * We store the address anyway, and let in6_selectsrc() 3105 * validate the specified address. This is because ipi6_addr 3106 * may not have enough information about its scope zone, and 3107 * we may need additional information (such as outgoing 3108 * interface or the scope zone of a destination address) to 3109 * disambiguate the scope. 3110 * XXX: the delay of the validation may confuse the 3111 * application when it is used as a sticky option. 3112 */ 3113 if (opt->ip6po_pktinfo == NULL) { 3114 opt->ip6po_pktinfo = malloc(sizeof(*pktinfo), 3115 M_IP6OPT, M_NOWAIT); 3116 if (opt->ip6po_pktinfo == NULL) 3117 return (ENOBUFS); 3118 } 3119 bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); 3120 break; 3121 } 3122 3123 case IPV6_2292HOPLIMIT: 3124 case IPV6_HOPLIMIT: 3125 { 3126 int *hlimp; 3127 3128 /* 3129 * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT 3130 * to simplify the ordering among hoplimit options. 3131 */ 3132 if (optname == IPV6_HOPLIMIT && sticky) 3133 return (ENOPROTOOPT); 3134 3135 if (len != sizeof(int)) 3136 return (EINVAL); 3137 hlimp = (int *)buf; 3138 if (*hlimp < -1 || *hlimp > 255) 3139 return (EINVAL); 3140 3141 opt->ip6po_hlim = *hlimp; 3142 break; 3143 } 3144 3145 case IPV6_TCLASS: 3146 { 3147 int tclass; 3148 3149 if (len != sizeof(int)) 3150 return (EINVAL); 3151 tclass = *(int *)buf; 3152 if (tclass < -1 || tclass > 255) 3153 return (EINVAL); 3154 3155 opt->ip6po_tclass = tclass; 3156 break; 3157 } 3158 3159 case IPV6_2292NEXTHOP: 3160 case IPV6_NEXTHOP: 3161 if (!priv) 3162 return (EPERM); 3163 3164 if (len == 0) { /* just remove the option */ 3165 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3166 break; 3167 } 3168 3169 /* check if cmsg_len is large enough for sa_len */ 3170 if (len < sizeof(struct sockaddr) || len < *buf) 3171 return (EINVAL); 3172 3173 switch (((struct sockaddr *)buf)->sa_family) { 3174 case AF_INET6: 3175 { 3176 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)buf; 3177 int error; 3178 3179 if (sa6->sin6_len != sizeof(struct sockaddr_in6)) 3180 return (EINVAL); 3181 3182 if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || 3183 IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { 3184 return (EINVAL); 3185 } 3186 if ((error = sa6_embedscope(sa6, ip6_use_defzone)) 3187 != 0) { 3188 return (error); 3189 } 3190 break; 3191 } 3192 case AF_LINK: /* should eventually be supported */ 3193 default: 3194 return (EAFNOSUPPORT); 3195 } 3196 3197 /* turn off the previous option, then set the new option. */ 3198 ip6_clearpktopts(opt, IPV6_NEXTHOP); 3199 opt->ip6po_nexthop = malloc(*buf, M_IP6OPT, M_NOWAIT); 3200 if (opt->ip6po_nexthop == NULL) 3201 return (ENOBUFS); 3202 bcopy(buf, opt->ip6po_nexthop, *buf); 3203 break; 3204 3205 case IPV6_2292HOPOPTS: 3206 case IPV6_HOPOPTS: 3207 { 3208 struct ip6_hbh *hbh; 3209 int hbhlen; 3210 3211 /* 3212 * XXX: We don't allow a non-privileged user to set ANY HbH 3213 * options, since per-option restriction has too much 3214 * overhead. 3215 */ 3216 if (!priv) 3217 return (EPERM); 3218 3219 if (len == 0) { 3220 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3221 break; /* just remove the option */ 3222 } 3223 3224 /* message length validation */ 3225 if (len < sizeof(struct ip6_hbh)) 3226 return (EINVAL); 3227 hbh = (struct ip6_hbh *)buf; 3228 hbhlen = (hbh->ip6h_len + 1) << 3; 3229 if (len != hbhlen) 3230 return (EINVAL); 3231 3232 /* turn off the previous option, then set the new option. */ 3233 ip6_clearpktopts(opt, IPV6_HOPOPTS); 3234 opt->ip6po_hbh = malloc(hbhlen, M_IP6OPT, M_NOWAIT); 3235 if (opt->ip6po_hbh == NULL) 3236 return (ENOBUFS); 3237 bcopy(hbh, opt->ip6po_hbh, hbhlen); 3238 3239 break; 3240 } 3241 3242 case IPV6_2292DSTOPTS: 3243 case IPV6_DSTOPTS: 3244 case IPV6_RTHDRDSTOPTS: 3245 { 3246 struct ip6_dest *dest, **newdest = NULL; 3247 int destlen; 3248 3249 if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ 3250 return (EPERM); 3251 3252 if (len == 0) { 3253 ip6_clearpktopts(opt, optname); 3254 break; /* just remove the option */ 3255 } 3256 3257 /* message length validation */ 3258 if (len < sizeof(struct ip6_dest)) 3259 return (EINVAL); 3260 dest = (struct ip6_dest *)buf; 3261 destlen = (dest->ip6d_len + 1) << 3; 3262 if (len != destlen) 3263 return (EINVAL); 3264 3265 /* 3266 * Determine the position that the destination options header 3267 * should be inserted; before or after the routing header. 3268 */ 3269 switch (optname) { 3270 case IPV6_2292DSTOPTS: 3271 /* 3272 * The old advacned API is ambiguous on this point. 3273 * Our approach is to determine the position based 3274 * according to the existence of a routing header. 3275 * Note, however, that this depends on the order of the 3276 * extension headers in the ancillary data; the 1st 3277 * part of the destination options header must appear 3278 * before the routing header in the ancillary data, 3279 * too. 3280 * RFC3542 solved the ambiguity by introducing 3281 * separate ancillary data or option types. 3282 */ 3283 if (opt->ip6po_rthdr == NULL) 3284 newdest = &opt->ip6po_dest1; 3285 else 3286 newdest = &opt->ip6po_dest2; 3287 break; 3288 case IPV6_RTHDRDSTOPTS: 3289 newdest = &opt->ip6po_dest1; 3290 break; 3291 case IPV6_DSTOPTS: 3292 newdest = &opt->ip6po_dest2; 3293 break; 3294 } 3295 3296 /* turn off the previous option, then set the new option. */ 3297 ip6_clearpktopts(opt, optname); 3298 *newdest = malloc(destlen, M_IP6OPT, M_NOWAIT); 3299 if (*newdest == NULL) 3300 return (ENOBUFS); 3301 bcopy(dest, *newdest, destlen); 3302 3303 break; 3304 } 3305 3306 case IPV6_2292RTHDR: 3307 case IPV6_RTHDR: 3308 { 3309 struct ip6_rthdr *rth; 3310 int rthlen; 3311 3312 if (len == 0) { 3313 ip6_clearpktopts(opt, IPV6_RTHDR); 3314 break; /* just remove the option */ 3315 } 3316 3317 /* message length validation */ 3318 if (len < sizeof(struct ip6_rthdr)) 3319 return (EINVAL); 3320 rth = (struct ip6_rthdr *)buf; 3321 rthlen = (rth->ip6r_len + 1) << 3; 3322 if (len != rthlen) 3323 return (EINVAL); 3324 3325 switch (rth->ip6r_type) { 3326 case IPV6_RTHDR_TYPE_0: 3327 if (rth->ip6r_len == 0) /* must contain one addr */ 3328 return (EINVAL); 3329 if (rth->ip6r_len % 2) /* length must be even */ 3330 return (EINVAL); 3331 if (rth->ip6r_len / 2 != rth->ip6r_segleft) 3332 return (EINVAL); 3333 break; 3334 default: 3335 return (EINVAL); /* not supported */ 3336 } 3337 3338 /* turn off the previous option */ 3339 ip6_clearpktopts(opt, IPV6_RTHDR); 3340 opt->ip6po_rthdr = malloc(rthlen, M_IP6OPT, M_NOWAIT); 3341 if (opt->ip6po_rthdr == NULL) 3342 return (ENOBUFS); 3343 bcopy(rth, opt->ip6po_rthdr, rthlen); 3344 3345 break; 3346 } 3347 3348 case IPV6_USE_MIN_MTU: 3349 if (len != sizeof(int)) 3350 return (EINVAL); 3351 minmtupolicy = *(int *)buf; 3352 if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && 3353 minmtupolicy != IP6PO_MINMTU_DISABLE && 3354 minmtupolicy != IP6PO_MINMTU_ALL) { 3355 return (EINVAL); 3356 } 3357 opt->ip6po_minmtu = minmtupolicy; 3358 break; 3359 3360 case IPV6_DONTFRAG: 3361 if (len != sizeof(int)) 3362 return (EINVAL); 3363 3364 if (uproto == IPPROTO_TCP || *(int *)buf == 0) { 3365 /* 3366 * we ignore this option for TCP sockets. 3367 * (RFC3542 leaves this case unspecified.) 3368 */ 3369 opt->ip6po_flags &= ~IP6PO_DONTFRAG; 3370 } else 3371 opt->ip6po_flags |= IP6PO_DONTFRAG; 3372 break; 3373 3374 case IPV6_PREFER_TEMPADDR: 3375 if (len != sizeof(int)) 3376 return (EINVAL); 3377 preftemp = *(int *)buf; 3378 if (preftemp != IP6PO_TEMPADDR_SYSTEM && 3379 preftemp != IP6PO_TEMPADDR_NOTPREFER && 3380 preftemp != IP6PO_TEMPADDR_PREFER) { 3381 return (EINVAL); 3382 } 3383 opt->ip6po_prefer_tempaddr = preftemp; 3384 break; 3385 3386 default: 3387 return (ENOPROTOOPT); 3388 } /* end of switch */ 3389 3390 return (0); 3391 } 3392 3393 /* 3394 * Routine called from ip6_output() to loop back a copy of an IP6 multicast 3395 * packet to the input queue of a specified interface. Note that this 3396 * calls the output routine of the loopback "driver", but with an interface 3397 * pointer that might NOT be &loif -- easier than replicating that code here. 3398 */ 3399 void 3400 ip6_mloopback(ifp, m, dst) 3401 struct ifnet *ifp; 3402 struct mbuf *m; 3403 struct sockaddr_in6 *dst; 3404 { 3405 struct mbuf *copym; 3406 struct ip6_hdr *ip6; 3407 3408 copym = m_copy(m, 0, M_COPYALL); 3409 if (copym == NULL) 3410 return; 3411 3412 /* 3413 * Make sure to deep-copy IPv6 header portion in case the data 3414 * is in an mbuf cluster, so that we can safely override the IPv6 3415 * header portion later. 3416 */ 3417 if ((copym->m_flags & M_EXT) != 0 || 3418 copym->m_len < sizeof(struct ip6_hdr)) { 3419 copym = m_pullup(copym, sizeof(struct ip6_hdr)); 3420 if (copym == NULL) 3421 return; 3422 } 3423 3424 #ifdef DIAGNOSTIC 3425 if (copym->m_len < sizeof(*ip6)) { 3426 m_freem(copym); 3427 return; 3428 } 3429 #endif 3430 3431 ip6 = mtod(copym, struct ip6_hdr *); 3432 /* 3433 * clear embedded scope identifiers if necessary. 3434 * in6_clearscope will touch the addresses only when necessary. 3435 */ 3436 in6_clearscope(&ip6->ip6_src); 3437 in6_clearscope(&ip6->ip6_dst); 3438 3439 (void)if_simloop(ifp, copym, dst->sin6_family, 0); 3440 } 3441 3442 /* 3443 * Chop IPv6 header off from the payload. 3444 */ 3445 static int 3446 ip6_splithdr(m, exthdrs) 3447 struct mbuf *m; 3448 struct ip6_exthdrs *exthdrs; 3449 { 3450 struct mbuf *mh; 3451 struct ip6_hdr *ip6; 3452 3453 ip6 = mtod(m, struct ip6_hdr *); 3454 if (m->m_len > sizeof(*ip6)) { 3455 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 3456 if (mh == 0) { 3457 m_freem(m); 3458 return ENOBUFS; 3459 } 3460 M_MOVE_PKTHDR(mh, m); 3461 MH_ALIGN(mh, sizeof(*ip6)); 3462 m->m_len -= sizeof(*ip6); 3463 m->m_data += sizeof(*ip6); 3464 mh->m_next = m; 3465 m = mh; 3466 m->m_len = sizeof(*ip6); 3467 bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); 3468 } 3469 exthdrs->ip6e_ip6 = m; 3470 return 0; 3471 } 3472 3473 /* 3474 * Compute IPv6 extension header length. 3475 */ 3476 int 3477 ip6_optlen(in6p) 3478 struct in6pcb *in6p; 3479 { 3480 int len; 3481 3482 if (!in6p->in6p_outputopts) 3483 return 0; 3484 3485 len = 0; 3486 #define elen(x) \ 3487 (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) 3488 3489 len += elen(in6p->in6p_outputopts->ip6po_hbh); 3490 if (in6p->in6p_outputopts->ip6po_rthdr) 3491 /* dest1 is valid with rthdr only */ 3492 len += elen(in6p->in6p_outputopts->ip6po_dest1); 3493 len += elen(in6p->in6p_outputopts->ip6po_rthdr); 3494 len += elen(in6p->in6p_outputopts->ip6po_dest2); 3495 return len; 3496 #undef elen 3497 }
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